drivers/md/md.c

   1 /*
   2    md.c : Multiple Devices driver for Linux
   3           Copyright (C) 1998, 1999, 2000 Ingo Molnar
   4
   5      completely rewritten, based on the MD driver code from Marc Zyngier
   6
   7    Changes:
   8
   9    - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
  10    - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
  11    - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
  12    - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
  13    - kmod support by: Cyrus Durgin
  14    - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
  15    - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
  16
  17    - lots of fixes and improvements to the RAID1/RAID5 and generic
  18      RAID code (such as request based resynchronization):
  19
  20      Neil Brown <neilb@cse.unsw.edu.au>.
  21
  22    - persistent bitmap code
  23      Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
  24
  25    This program is free software; you can redistribute it and/or modify
  26    it under the terms of the GNU General Public License as published by
  27    the Free Software Foundation; either version 2, or (at your option)
  28    any later version.
  29
  30    You should have received a copy of the GNU General Public License
  31    (for example /usr/src/linux/COPYING); if not, write to the Free
  32    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33 */
  34
  35 #include <linux/kthread.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/buffer_head.h> /* for invalidate_bdev */
  40 #include <linux/poll.h>
  41 #include <linux/ctype.h>
  42 #include <linux/hdreg.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/random.h>
  45 #include <linux/reboot.h>
  46 #include <linux/file.h>
  47 #include <linux/delay.h>
  48 #include <linux/raid/md_p.h>
  49 #include <linux/raid/md_u.h>
  50 #include "md.h"
  51 #include "bitmap.h"
  52
  53 #define DEBUG 0
  54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
  55
  56
  57 #ifndef MODULE
  58 static void autostart_arrays(int part);
  59 #endif
  60
  61 static LIST_HEAD(pers_list);
  62 static DEFINE_SPINLOCK(pers_lock);
  63
  64 static void md_print_devices(void);
  65
  66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
  67
  68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
  69
  70 /*
  71  * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
  72  * is 1000 KB/sec, so the extra system load does not show up that much.
  73  * Increase it if you want to have more _guaranteed_ speed. Note that
  74  * the RAID driver will use the maximum available bandwidth if the IO
  75  * subsystem is idle. There is also an 'absolute maximum' reconstruction
  76  * speed limit - in case reconstruction slows down your system despite
  77  * idle IO detection.
  78  *
  79  * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
  80  * or /sys/block/mdX/md/sync_speed_{min,max}
  81  */
  82
  83 static int sysctl_speed_limit_min = 1000;
  84 static int sysctl_speed_limit_max = 200000;
  85 static inline int speed_min(mddev_t *mddev)
  86 {
  87         return mddev->sync_speed_min ?
  88                 mddev->sync_speed_min : sysctl_speed_limit_min;
  89 }
  90
  91 static inline int speed_max(mddev_t *mddev)
  92 {
  93         return mddev->sync_speed_max ?
  94                 mddev->sync_speed_max : sysctl_speed_limit_max;
  95 }
  96
  97 static struct ctl_table_header *raid_table_header;
  98
  99 static ctl_table raid_table[] = {
 100         {
 101                 .ctl_name       = DEV_RAID_SPEED_LIMIT_MIN,
 102                 .procname       = "speed_limit_min",
 103                 .data           = &sysctl_speed_limit_min,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = S_IRUGO|S_IWUSR,
 106                 .proc_handler   = &proc_dointvec,
 107         },
 108         {
 109                 .ctl_name       = DEV_RAID_SPEED_LIMIT_MAX,
 110                 .procname       = "speed_limit_max",
 111                 .data           = &sysctl_speed_limit_max,
 112                 .maxlen         = sizeof(int),
 113                 .mode           = S_IRUGO|S_IWUSR,
 114                 .proc_handler   = &proc_dointvec,
 115         },
 116         { .ctl_name = 0 }
 117 };
 118
 119 static ctl_table raid_dir_table[] = {
 120         {
 121                 .ctl_name       = DEV_RAID,
 122                 .procname       = "raid",
 123                 .maxlen         = 0,
 124                 .mode           = S_IRUGO|S_IXUGO,
 125                 .child          = raid_table,
 126         },
 127         { .ctl_name = 0 }
 128 };
 129
 130 static ctl_table raid_root_table[] = {
 131         {
 132                 .ctl_name       = CTL_DEV,
 133                 .procname       = "dev",
 134                 .maxlen         = 0,
 135                 .mode           = 0555,
 136                 .child          = raid_dir_table,
 137         },
 138         { .ctl_name = 0 }
 139 };
 140
 141 static const struct block_device_operations md_fops;
 142
 143 static int start_readonly;
 144
 145 /*
 146  * We have a system wide 'event count' that is incremented
 147  * on any 'interesting' event, and readers of /proc/mdstat
 148  * can use 'poll' or 'select' to find out when the event
 149  * count increases.
 150  *
 151  * Events are:
 152  *  start array, stop array, error, add device, remove device,
 153  *  start build, activate spare
 154  */
 155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
 156 static atomic_t md_event_count;
 157 void md_new_event(mddev_t *mddev)
 158 {
 159         atomic_inc(&md_event_count);
 160         wake_up(&md_event_waiters);
 161 }
 162 EXPORT_SYMBOL_GPL(md_new_event);
 163
 164 /* Alternate version that can be called from interrupts
 165  * when calling sysfs_notify isn't needed.
 166  */
 167 static void md_new_event_inintr(mddev_t *mddev)
 168 {
 169         atomic_inc(&md_event_count);
 170         wake_up(&md_event_waiters);
 171 }
 172
 173 /*
 174  * Enables to iterate over all existing md arrays
 175  * all_mddevs_lock protects this list.
 176  */
 177 static LIST_HEAD(all_mddevs);
 178 static DEFINE_SPINLOCK(all_mddevs_lock);
 179
 180
 181 /*
 182  * iterates through all used mddevs in the system.
 183  * We take care to grab the all_mddevs_lock whenever navigating
 184  * the list, and to always hold a refcount when unlocked.
 185  * Any code which breaks out of this loop while own
 186  * a reference to the current mddev and must mddev_put it.
 187  */
 188 #define for_each_mddev(mddev,tmp)                                       \
 189                                                                         \
 190         for (({ spin_lock(&all_mddevs_lock);                            \
 191                 tmp = all_mddevs.next;                                  \
 192                 mddev = NULL;});                                        \
 193              ({ if (tmp != &all_mddevs)                                 \
 194                         mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
 195                 spin_unlock(&all_mddevs_lock);                          \
 196                 if (mddev) mddev_put(mddev);                            \
 197                 mddev = list_entry(tmp, mddev_t, all_mddevs);           \
 198                 tmp != &all_mddevs;});                                  \
 199              ({ spin_lock(&all_mddevs_lock);                            \
 200                 tmp = tmp->next;})                                      \
 201                 )
 202
 203
 204 /* Rather than calling directly into the personality make_request function,
 205  * IO requests come here first so that we can check if the device is
 206  * being suspended pending a reconfiguration.
 207  * We hold a refcount over the call to ->make_request.  By the time that
 208  * call has finished, the bio has been linked into some internal structure
 209  * and so is visible to ->quiesce(), so we don't need the refcount any more.
 210  */
 211 static int md_make_request(struct request_queue *q, struct bio *bio)
 212 {
 213         mddev_t *mddev = q->queuedata;
 214         int rv;
 215         if (mddev == NULL || mddev->pers == NULL) {
 216                 bio_io_error(bio);
 217                 return 0;
 218         }
 219         rcu_read_lock();
 220         if (mddev->suspended) {
 221                 DEFINE_WAIT(__wait);
 222                 for (;;) {
 223                         prepare_to_wait(&mddev->sb_wait, &__wait,
 224                                         TASK_UNINTERRUPTIBLE);
 225                         if (!mddev->suspended)
 226                                 break;
 227                         rcu_read_unlock();
 228                         schedule();
 229                         rcu_read_lock();
 230                 }
 231                 finish_wait(&mddev->sb_wait, &__wait);
 232         }
 233         atomic_inc(&mddev->active_io);
 234         rcu_read_unlock();
 235         rv = mddev->pers->make_request(q, bio);
 236         if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
 237                 wake_up(&mddev->sb_wait);
 238
 239         return rv;
 240 }
 241
 242 static void mddev_suspend(mddev_t *mddev)
 243 {
 244         BUG_ON(mddev->suspended);
 245         mddev->suspended = 1;
 246         synchronize_rcu();
 247         wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
 248         mddev->pers->quiesce(mddev, 1);
 249         md_unregister_thread(mddev->thread);
 250         mddev->thread = NULL;
 251         /* we now know that no code is executing in the personality module,
 252          * except possibly the tail end of a ->bi_end_io function, but that
 253          * is certain to complete before the module has a chance to get
 254          * unloaded
 255          */
 256 }
 257
 258 static void mddev_resume(mddev_t *mddev)
 259 {
 260         mddev->suspended = 0;
 261         wake_up(&mddev->sb_wait);
 262         mddev->pers->quiesce(mddev, 0);
 263 }
 264
 265 int mddev_congested(mddev_t *mddev, int bits)
 266 {
 267         return mddev->suspended;
 268 }
 269 EXPORT_SYMBOL(mddev_congested);
 270
 271
 272 static inline mddev_t *mddev_get(mddev_t *mddev)
 273 {
 274         atomic_inc(&mddev->active);
 275         return mddev;
 276 }
 277
 278 static void mddev_delayed_delete(struct work_struct *ws);
 279
 280 static void mddev_put(mddev_t *mddev)
 281 {
 282         if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
 283                 return;
 284         if (!mddev->raid_disks && list_empty(&mddev->disks) &&
 285             mddev->ctime == 0 && !mddev->hold_active) {
 286                 /* Array is not configured at all, and not held active,
 287                  * so destroy it */
 288                 list_del(&mddev->all_mddevs);
 289                 if (mddev->gendisk) {
 290                         /* we did a probe so need to clean up.
 291                          * Call schedule_work inside the spinlock
 292                          * so that flush_scheduled_work() after
 293                          * mddev_find will succeed in waiting for the
 294                          * work to be done.
 295                          */
 296                         INIT_WORK(&mddev->del_work, mddev_delayed_delete);
 297                         schedule_work(&mddev->del_work);
 298                 } else
 299                         kfree(mddev);
 300         }
 301         spin_unlock(&all_mddevs_lock);
 302 }
 303
 304 static mddev_t * mddev_find(dev_t unit)
 305 {
 306         mddev_t *mddev, *new = NULL;
 307
 308  retry:
 309         spin_lock(&all_mddevs_lock);
 310
 311         if (unit) {
 312                 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
 313                         if (mddev->unit == unit) {
 314                                 mddev_get(mddev);
 315                                 spin_unlock(&all_mddevs_lock);
 316                                 kfree(new);
 317                                 return mddev;
 318                         }
 319
 320                 if (new) {
 321                         list_add(&new->all_mddevs, &all_mddevs);
 322                         spin_unlock(&all_mddevs_lock);
 323                         new->hold_active = UNTIL_IOCTL;
 324                         return new;
 325                 }
 326         } else if (new) {
 327                 /* find an unused unit number */
 328                 static int next_minor = 512;
 329                 int start = next_minor;
 330                 int is_free = 0;
 331                 int dev = 0;
 332                 while (!is_free) {
 333                         dev = MKDEV(MD_MAJOR, next_minor);
 334                         next_minor++;
 335                         if (next_minor > MINORMASK)
 336                                 next_minor = 0;
 337                         if (next_minor == start) {
 338                                 /* Oh dear, all in use. */
 339                                 spin_unlock(&all_mddevs_lock);
 340                                 kfree(new);
 341                                 return NULL;
 342                         }
 343
 344                         is_free = 1;
 345                         list_for_each_entry(mddev, &all_mddevs, all_mddevs)
 346                                 if (mddev->unit == dev) {
 347                                         is_free = 0;
 348                                         break;
 349                                 }
 350                 }
 351                 new->unit = dev;
 352                 new->md_minor = MINOR(dev);
 353                 new->hold_active = UNTIL_STOP;
 354                 list_add(&new->all_mddevs, &all_mddevs);
 355                 spin_unlock(&all_mddevs_lock);
 356                 return new;
 357         }
 358         spin_unlock(&all_mddevs_lock);
 359
 360         new = kzalloc(sizeof(*new), GFP_KERNEL);
 361         if (!new)
 362                 return NULL;
 363
 364         new->unit = unit;
 365         if (MAJOR(unit) == MD_MAJOR)
 366                 new->md_minor = MINOR(unit);
 367         else
 368                 new->md_minor = MINOR(unit) >> MdpMinorShift;
 369
 370         mutex_init(&new->open_mutex);
 371         mutex_init(&new->reconfig_mutex);
 372         mutex_init(&new->bitmap_mutex);
 373         INIT_LIST_HEAD(&new->disks);
 374         INIT_LIST_HEAD(&new->all_mddevs);
 375         init_timer(&new->safemode_timer);
 376         atomic_set(&new->active, 1);
 377         atomic_set(&new->openers, 0);
 378         atomic_set(&new->active_io, 0);
 379         spin_lock_init(&new->write_lock);
 380         init_waitqueue_head(&new->sb_wait);
 381         init_waitqueue_head(&new->recovery_wait);
 382         new->reshape_position = MaxSector;
 383         new->resync_min = 0;
 384         new->resync_max = MaxSector;
 385         new->level = LEVEL_NONE;
 386
 387         goto retry;
 388 }
 389
 390 static inline int mddev_lock(mddev_t * mddev)
 391 {
 392         return mutex_lock_interruptible(&mddev->reconfig_mutex);
 393 }
 394
 395 static inline int mddev_is_locked(mddev_t *mddev)
 396 {
 397         return mutex_is_locked(&mddev->reconfig_mutex);
 398 }
 399
 400 static inline int mddev_trylock(mddev_t * mddev)
 401 {
 402         return mutex_trylock(&mddev->reconfig_mutex);
 403 }
 404
 405 static inline void mddev_unlock(mddev_t * mddev)
 406 {
 407         mutex_unlock(&mddev->reconfig_mutex);
 408
 409         md_wakeup_thread(mddev->thread);
 410 }
 411
 412 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
 413 {
 414         mdk_rdev_t *rdev;
 415
 416         list_for_each_entry(rdev, &mddev->disks, same_set)
 417                 if (rdev->desc_nr == nr)
 418                         return rdev;
 419
 420         return NULL;
 421 }
 422
 423 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
 424 {
 425         mdk_rdev_t *rdev;
 426
 427         list_for_each_entry(rdev, &mddev->disks, same_set)
 428                 if (rdev->bdev->bd_dev == dev)
 429                         return rdev;
 430
 431         return NULL;
 432 }
 433
 434 static struct mdk_personality *find_pers(int level, char *clevel)
 435 {
 436         struct mdk_personality *pers;
 437         list_for_each_entry(pers, &pers_list, list) {
 438                 if (level != LEVEL_NONE && pers->level == level)
 439                         return pers;
 440                 if (strcmp(pers->name, clevel)==0)
 441                         return pers;
 442         }
 443         return NULL;
 444 }
 445
 446 /* return the offset of the super block in 512byte sectors */
 447 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
 448 {
 449         sector_t num_sectors = bdev->bd_inode->i_size / 512;
 450         return MD_NEW_SIZE_SECTORS(num_sectors);
 451 }
 452
 453 static int alloc_disk_sb(mdk_rdev_t * rdev)
 454 {
 455         if (rdev->sb_page)
 456                 MD_BUG();
 457
 458         rdev->sb_page = alloc_page(GFP_KERNEL);
 459         if (!rdev->sb_page) {
 460                 printk(KERN_ALERT "md: out of memory.\n");
 461                 return -ENOMEM;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static void free_disk_sb(mdk_rdev_t * rdev)
 468 {
 469         if (rdev->sb_page) {
 470                 put_page(rdev->sb_page);
 471                 rdev->sb_loaded = 0;
 472                 rdev->sb_page = NULL;
 473                 rdev->sb_start = 0;
 474                 rdev->sectors = 0;
 475         }
 476 }
 477
 478
 479 static void super_written(struct bio *bio, int error)
 480 {
 481         mdk_rdev_t *rdev = bio->bi_private;
 482         mddev_t *mddev = rdev->mddev;
 483
 484         if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
 485                 printk("md: super_written gets error=%d, uptodate=%d\n",
 486                        error, test_bit(BIO_UPTODATE, &bio->bi_flags));
 487                 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
 488                 md_error(mddev, rdev);
 489         }
 490
 491         if (atomic_dec_and_test(&mddev->pending_writes))
 492                 wake_up(&mddev->sb_wait);
 493         bio_put(bio);
 494 }
 495
 496 static void super_written_barrier(struct bio *bio, int error)
 497 {
 498         struct bio *bio2 = bio->bi_private;
 499         mdk_rdev_t *rdev = bio2->bi_private;
 500         mddev_t *mddev = rdev->mddev;
 501
 502         if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
 503             error == -EOPNOTSUPP) {
 504                 unsigned long flags;
 505                 /* barriers don't appear to be supported :-( */
 506                 set_bit(BarriersNotsupp, &rdev->flags);
 507                 mddev->barriers_work = 0;
 508                 spin_lock_irqsave(&mddev->write_lock, flags);
 509                 bio2->bi_next = mddev->biolist;
 510                 mddev->biolist = bio2;
 511                 spin_unlock_irqrestore(&mddev->write_lock, flags);
 512                 wake_up(&mddev->sb_wait);
 513                 bio_put(bio);
 514         } else {
 515                 bio_put(bio2);
 516                 bio->bi_private = rdev;
 517                 super_written(bio, error);
 518         }
 519 }
 520
 521 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
 522                    sector_t sector, int size, struct page *page)
 523 {
 524         /* write first size bytes of page to sector of rdev
 525          * Increment mddev->pending_writes before returning
 526          * and decrement it on completion, waking up sb_wait
 527          * if zero is reached.
 528          * If an error occurred, call md_error
 529          *
 530          * As we might need to resubmit the request if BIO_RW_BARRIER
 531          * causes ENOTSUPP, we allocate a spare bio...
 532          */
 533         struct bio *bio = bio_alloc(GFP_NOIO, 1);
 534         int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
 535
 536         bio->bi_bdev = rdev->bdev;
 537         bio->bi_sector = sector;
 538         bio_add_page(bio, page, size, 0);
 539         bio->bi_private = rdev;
 540         bio->bi_end_io = super_written;
 541         bio->bi_rw = rw;
 542
 543         atomic_inc(&mddev->pending_writes);
 544         if (!test_bit(BarriersNotsupp, &rdev->flags)) {
 545                 struct bio *rbio;
 546                 rw |= (1<<BIO_RW_BARRIER);
 547                 rbio = bio_clone(bio, GFP_NOIO);
 548                 rbio->bi_private = bio;
 549                 rbio->bi_end_io = super_written_barrier;
 550                 submit_bio(rw, rbio);
 551         } else
 552                 submit_bio(rw, bio);
 553 }
 554
 555 void md_super_wait(mddev_t *mddev)
 556 {
 557         /* wait for all superblock writes that were scheduled to complete.
 558          * if any had to be retried (due to BARRIER problems), retry them
 559          */
 560         DEFINE_WAIT(wq);
 561         for(;;) {
 562                 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
 563                 if (atomic_read(&mddev->pending_writes)==0)
 564                         break;
 565                 while (mddev->biolist) {
 566                         struct bio *bio;
 567                         spin_lock_irq(&mddev->write_lock);
 568                         bio = mddev->biolist;
 569                         mddev->biolist = bio->bi_next ;
 570                         bio->bi_next = NULL;
 571                         spin_unlock_irq(&mddev->write_lock);
 572                         submit_bio(bio->bi_rw, bio);
 573                 }
 574                 schedule();
 575         }
 576         finish_wait(&mddev->sb_wait, &wq);
 577 }
 578
 579 static void bi_complete(struct bio *bio, int error)
 580 {
 581         complete((struct completion*)bio->bi_private);
 582 }
 583
 584 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
 585                    struct page *page, int rw)
 586 {
 587         struct bio *bio = bio_alloc(GFP_NOIO, 1);
 588         struct completion event;
 589         int ret;
 590
 591         rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
 592
 593         bio->bi_bdev = bdev;
 594         bio->bi_sector = sector;
 595         bio_add_page(bio, page, size, 0);
 596         init_completion(&event);
 597         bio->bi_private = &event;
 598         bio->bi_end_io = bi_complete;
 599         submit_bio(rw, bio);
 600         wait_for_completion(&event);
 601
 602         ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
 603         bio_put(bio);
 604         return ret;
 605 }
 606 EXPORT_SYMBOL_GPL(sync_page_io);
 607
 608 static int read_disk_sb(mdk_rdev_t * rdev, int size)
 609 {
 610         char b[BDEVNAME_SIZE];
 611         if (!rdev->sb_page) {
 612                 MD_BUG();
 613                 return -EINVAL;
 614         }
 615         if (rdev->sb_loaded)
 616                 return 0;
 617
 618
 619         if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
 620                 goto fail;
 621         rdev->sb_loaded = 1;
 622         return 0;
 623
 624 fail:
 625         printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
 626                 bdevname(rdev->bdev,b));
 627         return -EINVAL;
 628 }
 629
 630 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
 631 {
 632         return  sb1->set_uuid0 == sb2->set_uuid0 &&
 633                 sb1->set_uuid1 == sb2->set_uuid1 &&
 634                 sb1->set_uuid2 == sb2->set_uuid2 &&
 635                 sb1->set_uuid3 == sb2->set_uuid3;
 636 }
 637
 638 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
 639 {
 640         int ret;
 641         mdp_super_t *tmp1, *tmp2;
 642
 643         tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
 644         tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
 645
 646         if (!tmp1 || !tmp2) {
 647                 ret = 0;
 648                 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
 649                 goto abort;
 650         }
 651
 652         *tmp1 = *sb1;
 653         *tmp2 = *sb2;
 654
 655         /*
 656          * nr_disks is not constant
 657          */
 658         tmp1->nr_disks = 0;
 659         tmp2->nr_disks = 0;
 660
 661         ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
 662 abort:
 663         kfree(tmp1);
 664         kfree(tmp2);
 665         return ret;
 666 }
 667
 668
 669 static u32 md_csum_fold(u32 csum)
 670 {
 671         csum = (csum & 0xffff) + (csum >> 16);
 672         return (csum & 0xffff) + (csum >> 16);
 673 }
 674
 675 static unsigned int calc_sb_csum(mdp_super_t * sb)
 676 {
 677         u64 newcsum = 0;
 678         u32 *sb32 = (u32*)sb;
 679         int i;
 680         unsigned int disk_csum, csum;
 681
 682         disk_csum = sb->sb_csum;
 683         sb->sb_csum = 0;
 684
 685         for (i = 0; i < MD_SB_BYTES/4 ; i++)
 686                 newcsum += sb32[i];
 687         csum = (newcsum & 0xffffffff) + (newcsum>>32);
 688
 689
 690 #ifdef CONFIG_ALPHA
 691         /* This used to use csum_partial, which was wrong for several
 692          * reasons including that different results are returned on
 693          * different architectures.  It isn't critical that we get exactly
 694          * the same return value as before (we always csum_fold before
 695          * testing, and that removes any differences).  However as we
 696          * know that csum_partial always returned a 16bit value on
 697          * alphas, do a fold to maximise conformity to previous behaviour.
 698          */
 699         sb->sb_csum = md_csum_fold(disk_csum);
 700 #else
 701         sb->sb_csum = disk_csum;
 702 #endif
 703         return csum;
 704 }
 705
 706
 707 /*
 708  * Handle superblock details.
 709  * We want to be able to handle multiple superblock formats
 710  * so we have a common interface to them all, and an array of
 711  * different handlers.
 712  * We rely on user-space to write the initial superblock, and support
 713  * reading and updating of superblocks.
 714  * Interface methods are:
 715  *   int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
 716  *      loads and validates a superblock on dev.
 717  *      if refdev != NULL, compare superblocks on both devices
 718  *    Return:
 719  *      0 - dev has a superblock that is compatible with refdev
 720  *      1 - dev has a superblock that is compatible and newer than refdev
 721  *          so dev should be used as the refdev in future
 722  *     -EINVAL superblock incompatible or invalid
 723  *     -othererror e.g. -EIO
 724  *
 725  *   int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
 726  *      Verify that dev is acceptable into mddev.
 727  *       The first time, mddev->raid_disks will be 0, and data from
 728  *       dev should be merged in.  Subsequent calls check that dev
 729  *       is new enough.  Return 0 or -EINVAL
 730  *
 731  *   void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
 732  *     Update the superblock for rdev with data in mddev
 733  *     This does not write to disc.
 734  *
 735  */
 736
 737 struct super_type  {
 738         char                *name;
 739         struct module       *owner;
 740         int                 (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
 741                                           int minor_version);
 742         int                 (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
 743         void                (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
 744         unsigned long long  (*rdev_size_change)(mdk_rdev_t *rdev,
 745                                                 sector_t num_sectors);
 746 };
 747
 748 /*
 749  * Check that the given mddev has no bitmap.
 750  *
 751  * This function is called from the run method of all personalities that do not
 752  * support bitmaps. It prints an error message and returns non-zero if mddev
 753  * has a bitmap. Otherwise, it returns 0.
 754  *
 755  */
 756 int md_check_no_bitmap(mddev_t *mddev)
 757 {
 758         if (!mddev->bitmap_file && !mddev->bitmap_offset)
 759                 return 0;
 760         printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
 761                 mdname(mddev), mddev->pers->name);
 762         return 1;
 763 }
 764 EXPORT_SYMBOL(md_check_no_bitmap);
 765
 766 /*
 767  * load_super for 0.90.0
 768  */
 769 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
 770 {
 771         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
 772         mdp_super_t *sb;
 773         int ret;
 774
 775         /*
 776          * Calculate the position of the superblock (512byte sectors),
 777          * it's at the end of the disk.
 778          *
 779          * It also happens to be a multiple of 4Kb.
 780          */
 781         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
 782
 783         ret = read_disk_sb(rdev, MD_SB_BYTES);
 784         if (ret) return ret;
 785
 786         ret = -EINVAL;
 787
 788         bdevname(rdev->bdev, b);
 789         sb = (mdp_super_t*)page_address(rdev->sb_page);
 790
 791         if (sb->md_magic != MD_SB_MAGIC) {
 792                 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
 793                        b);
 794                 goto abort;
 795         }
 796
 797         if (sb->major_version != 0 ||
 798             sb->minor_version < 90 ||
 799             sb->minor_version > 91) {
 800                 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
 801                         sb->major_version, sb->minor_version,
 802                         b);
 803                 goto abort;
 804         }
 805
 806         if (sb->raid_disks <= 0)
 807                 goto abort;
 808
 809         if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
 810                 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
 811                         b);
 812                 goto abort;
 813         }
 814
 815         rdev->preferred_minor = sb->md_minor;
 816         rdev->data_offset = 0;
 817         rdev->sb_size = MD_SB_BYTES;
 818
 819         if (sb->level == LEVEL_MULTIPATH)
 820                 rdev->desc_nr = -1;
 821         else
 822                 rdev->desc_nr = sb->this_disk.number;
 823
 824         if (!refdev) {
 825                 ret = 1;
 826         } else {
 827                 __u64 ev1, ev2;
 828                 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
 829                 if (!uuid_equal(refsb, sb)) {
 830                         printk(KERN_WARNING "md: %s has different UUID to %s\n",
 831                                 b, bdevname(refdev->bdev,b2));
 832                         goto abort;
 833                 }
 834                 if (!sb_equal(refsb, sb)) {
 835                         printk(KERN_WARNING "md: %s has same UUID"
 836                                " but different superblock to %s\n",
 837                                b, bdevname(refdev->bdev, b2));
 838                         goto abort;
 839                 }
 840                 ev1 = md_event(sb);
 841                 ev2 = md_event(refsb);
 842                 if (ev1 > ev2)
 843                         ret = 1;
 844                 else
 845                         ret = 0;
 846         }
 847         rdev->sectors = rdev->sb_start;
 848
 849         if (rdev->sectors < sb->size * 2 && sb->level > 1)
 850                 /* "this cannot possibly happen" ... */
 851                 ret = -EINVAL;
 852
 853  abort:
 854         return ret;
 855 }
 856
 857 /*
 858  * validate_super for 0.90.0
 859  */
 860 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
 861 {
 862         mdp_disk_t *desc;
 863         mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
 864         __u64 ev1 = md_event(sb);
 865
 866         rdev->raid_disk = -1;
 867         clear_bit(Faulty, &rdev->flags);
 868         clear_bit(In_sync, &rdev->flags);
 869         clear_bit(WriteMostly, &rdev->flags);
 870         clear_bit(BarriersNotsupp, &rdev->flags);
 871
 872         if (mddev->raid_disks == 0) {
 873                 mddev->major_version = 0;
 874                 mddev->minor_version = sb->minor_version;
 875                 mddev->patch_version = sb->patch_version;
 876                 mddev->external = 0;
 877                 mddev->chunk_sectors = sb->chunk_size >> 9;
 878                 mddev->ctime = sb->ctime;
 879                 mddev->utime = sb->utime;
 880                 mddev->level = sb->level;
 881                 mddev->clevel[0] = 0;
 882                 mddev->layout = sb->layout;
 883                 mddev->raid_disks = sb->raid_disks;
 884                 mddev->dev_sectors = sb->size * 2;
 885                 mddev->events = ev1;
 886                 mddev->bitmap_offset = 0;
 887                 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
 888
 889                 if (mddev->minor_version >= 91) {
 890                         mddev->reshape_position = sb->reshape_position;
 891                         mddev->delta_disks = sb->delta_disks;
 892                         mddev->new_level = sb->new_level;
 893                         mddev->new_layout = sb->new_layout;
 894                         mddev->new_chunk_sectors = sb->new_chunk >> 9;
 895                 } else {
 896                         mddev->reshape_position = MaxSector;
 897                         mddev->delta_disks = 0;
 898                         mddev->new_level = mddev->level;
 899                         mddev->new_layout = mddev->layout;
 900                         mddev->new_chunk_sectors = mddev->chunk_sectors;
 901                 }
 902
 903                 if (sb->state & (1<<MD_SB_CLEAN))
 904                         mddev->recovery_cp = MaxSector;
 905                 else {
 906                         if (sb->events_hi == sb->cp_events_hi &&
 907                                 sb->events_lo == sb->cp_events_lo) {
 908                                 mddev->recovery_cp = sb->recovery_cp;
 909                         } else
 910                                 mddev->recovery_cp = 0;
 911                 }
 912
 913                 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
 914                 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
 915                 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
 916                 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
 917
 918                 mddev->max_disks = MD_SB_DISKS;
 919
 920                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
 921                     mddev->bitmap_file == NULL)
 922                         mddev->bitmap_offset = mddev->default_bitmap_offset;
 923
 924         } else if (mddev->pers == NULL) {
 925                 /* Insist on good event counter while assembling */
 926                 ++ev1;
 927                 if (ev1 < mddev->events)
 928                         return -EINVAL;
 929         } else if (mddev->bitmap) {
 930                 /* if adding to array with a bitmap, then we can accept an
 931                  * older device ... but not too old.
 932                  */
 933                 if (ev1 < mddev->bitmap->events_cleared)
 934                         return 0;
 935         } else {
 936                 if (ev1 < mddev->events)
 937                         /* just a hot-add of a new device, leave raid_disk at -1 */
 938                         return 0;
 939         }
 940
 941         if (mddev->level != LEVEL_MULTIPATH) {
 942                 desc = sb->disks + rdev->desc_nr;
 943
 944                 if (desc->state & (1<<MD_DISK_FAULTY))
 945                         set_bit(Faulty, &rdev->flags);
 946                 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
 947                             desc->raid_disk < mddev->raid_disks */) {
 948                         set_bit(In_sync, &rdev->flags);
 949                         rdev->raid_disk = desc->raid_disk;
 950                 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
 951                         /* active but not in sync implies recovery up to
 952                          * reshape position.  We don't know exactly where
 953                          * that is, so set to zero for now */
 954                         if (mddev->minor_version >= 91) {
 955                                 rdev->recovery_offset = 0;
 956                                 rdev->raid_disk = desc->raid_disk;
 957                         }
 958                 }
 959                 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
 960                         set_bit(WriteMostly, &rdev->flags);
 961         } else /* MULTIPATH are always insync */
 962                 set_bit(In_sync, &rdev->flags);
 963         return 0;
 964 }
 965
 966 /*
 967  * sync_super for 0.90.0
 968  */
 969 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 970 {
 971         mdp_super_t *sb;
 972         mdk_rdev_t *rdev2;
 973         int next_spare = mddev->raid_disks;
 974
 975
 976         /* make rdev->sb match mddev data..
 977          *
 978          * 1/ zero out disks
 979          * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
 980          * 3/ any empty disks < next_spare become removed
 981          *
 982          * disks[0] gets initialised to REMOVED because
 983          * we cannot be sure from other fields if it has
 984          * been initialised or not.
 985          */
 986         int i;
 987         int active=0, working=0,failed=0,spare=0,nr_disks=0;
 988
 989         rdev->sb_size = MD_SB_BYTES;
 990
 991         sb = (mdp_super_t*)page_address(rdev->sb_page);
 992
 993         memset(sb, 0, sizeof(*sb));
 994
 995         sb->md_magic = MD_SB_MAGIC;
 996         sb->major_version = mddev->major_version;
 997         sb->patch_version = mddev->patch_version;
 998         sb->gvalid_words  = 0; /* ignored */
 999         memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1000         memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1001         memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1002         memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1003
1004         sb->ctime = mddev->ctime;
1005         sb->level = mddev->level;
1006         sb->size = mddev->dev_sectors / 2;
1007         sb->raid_disks = mddev->raid_disks;
1008         sb->md_minor = mddev->md_minor;
1009         sb->not_persistent = 0;
1010         sb->utime = mddev->utime;
1011         sb->state = 0;
1012         sb->events_hi = (mddev->events>>32);
1013         sb->events_lo = (u32)mddev->events;
1014
1015         if (mddev->reshape_position == MaxSector)
1016                 sb->minor_version = 90;
1017         else {
1018                 sb->minor_version = 91;
1019                 sb->reshape_position = mddev->reshape_position;
1020                 sb->new_level = mddev->new_level;
1021                 sb->delta_disks = mddev->delta_disks;
1022                 sb->new_layout = mddev->new_layout;
1023                 sb->new_chunk = mddev->new_chunk_sectors << 9;
1024         }
1025         mddev->minor_version = sb->minor_version;
1026         if (mddev->in_sync)
1027         {
1028                 sb->recovery_cp = mddev->recovery_cp;
1029                 sb->cp_events_hi = (mddev->events>>32);
1030                 sb->cp_events_lo = (u32)mddev->events;
1031                 if (mddev->recovery_cp == MaxSector)
1032                         sb->state = (1<< MD_SB_CLEAN);
1033         } else
1034                 sb->recovery_cp = 0;
1035
1036         sb->layout = mddev->layout;
1037         sb->chunk_size = mddev->chunk_sectors << 9;
1038
1039         if (mddev->bitmap && mddev->bitmap_file == NULL)
1040                 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1041
1042         sb->disks[0].state = (1<<MD_DISK_REMOVED);
1043         list_for_each_entry(rdev2, &mddev->disks, same_set) {
1044                 mdp_disk_t *d;
1045                 int desc_nr;
1046                 int is_active = test_bit(In_sync, &rdev2->flags);
1047
1048                 if (rdev2->raid_disk >= 0 &&
1049                     sb->minor_version >= 91)
1050                         /* we have nowhere to store the recovery_offset,
1051                          * but if it is not below the reshape_position,
1052                          * we can piggy-back on that.
1053                          */
1054                         is_active = 1;
1055                 if (rdev2->raid_disk < 0 ||
1056                     test_bit(Faulty, &rdev2->flags))
1057                         is_active = 0;
1058                 if (is_active)
1059                         desc_nr = rdev2->raid_disk;
1060                 else
1061                         desc_nr = next_spare++;
1062                 rdev2->desc_nr = desc_nr;
1063                 d = &sb->disks[rdev2->desc_nr];
1064                 nr_disks++;
1065                 d->number = rdev2->desc_nr;
1066                 d->major = MAJOR(rdev2->bdev->bd_dev);
1067                 d->minor = MINOR(rdev2->bdev->bd_dev);
1068                 if (is_active)
1069                         d->raid_disk = rdev2->raid_disk;
1070                 else
1071                         d->raid_disk = rdev2->desc_nr; /* compatibility */
1072                 if (test_bit(Faulty, &rdev2->flags))
1073                         d->state = (1<<MD_DISK_FAULTY);
1074                 else if (is_active) {
1075                         d->state = (1<<MD_DISK_ACTIVE);
1076                         if (test_bit(In_sync, &rdev2->flags))
1077                                 d->state |= (1<<MD_DISK_SYNC);
1078                         active++;
1079                         working++;
1080                 } else {
1081                         d->state = 0;
1082                         spare++;
1083                         working++;
1084                 }
1085                 if (test_bit(WriteMostly, &rdev2->flags))
1086                         d->state |= (1<<MD_DISK_WRITEMOSTLY);
1087         }
1088         /* now set the "removed" and "faulty" bits on any missing devices */
1089         for (i=0 ; i < mddev->raid_disks ; i++) {
1090                 mdp_disk_t *d = &sb->disks[i];
1091                 if (d->state == 0 && d->number == 0) {
1092                         d->number = i;
1093                         d->raid_disk = i;
1094                         d->state = (1<<MD_DISK_REMOVED);
1095                         d->state |= (1<<MD_DISK_FAULTY);
1096                         failed++;
1097                 }
1098         }
1099         sb->nr_disks = nr_disks;
1100         sb->active_disks = active;
1101         sb->working_disks = working;
1102         sb->failed_disks = failed;
1103         sb->spare_disks = spare;
1104
1105         sb->this_disk = sb->disks[rdev->desc_nr];
1106         sb->sb_csum = calc_sb_csum(sb);
1107 }
1108
1109 /*
1110  * rdev_size_change for 0.90.0
1111  */
1112 static unsigned long long
1113 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1114 {
1115         if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1116                 return 0; /* component must fit device */
1117         if (rdev->mddev->bitmap_offset)
1118                 return 0; /* can't move bitmap */
1119         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1120         if (!num_sectors || num_sectors > rdev->sb_start)
1121                 num_sectors = rdev->sb_start;
1122         md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1123                        rdev->sb_page);
1124         md_super_wait(rdev->mddev);
1125         return num_sectors / 2; /* kB for sysfs */
1126 }
1127
1128
1129 /*
1130  * version 1 superblock
1131  */
1132
1133 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1134 {
1135         __le32 disk_csum;
1136         u32 csum;
1137         unsigned long long newcsum;
1138         int size = 256 + le32_to_cpu(sb->max_dev)*2;
1139         __le32 *isuper = (__le32*)sb;
1140         int i;
1141
1142         disk_csum = sb->sb_csum;
1143         sb->sb_csum = 0;
1144         newcsum = 0;
1145         for (i=0; size>=4; size -= 4 )
1146                 newcsum += le32_to_cpu(*isuper++);
1147
1148         if (size == 2)
1149                 newcsum += le16_to_cpu(*(__le16*) isuper);
1150
1151         csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1152         sb->sb_csum = disk_csum;
1153         return cpu_to_le32(csum);
1154 }
1155
1156 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1157 {
1158         struct mdp_superblock_1 *sb;
1159         int ret;
1160         sector_t sb_start;
1161         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1162         int bmask;
1163
1164         /*
1165          * Calculate the position of the superblock in 512byte sectors.
1166          * It is always aligned to a 4K boundary and
1167          * depeding on minor_version, it can be:
1168          * 0: At least 8K, but less than 12K, from end of device
1169          * 1: At start of device
1170          * 2: 4K from start of device.
1171          */
1172         switch(minor_version) {
1173         case 0:
1174                 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1175                 sb_start -= 8*2;
1176                 sb_start &= ~(sector_t)(4*2-1);
1177                 break;
1178         case 1:
1179                 sb_start = 0;
1180                 break;
1181         case 2:
1182                 sb_start = 8;
1183                 break;
1184         default:
1185                 return -EINVAL;
1186         }
1187         rdev->sb_start = sb_start;
1188
1189         /* superblock is rarely larger than 1K, but it can be larger,
1190          * and it is safe to read 4k, so we do that
1191          */
1192         ret = read_disk_sb(rdev, 4096);
1193         if (ret) return ret;
1194
1195
1196         sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1197
1198         if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1199             sb->major_version != cpu_to_le32(1) ||
1200             le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1201             le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1202             (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1203                 return -EINVAL;
1204
1205         if (calc_sb_1_csum(sb) != sb->sb_csum) {
1206                 printk("md: invalid superblock checksum on %s\n",
1207                         bdevname(rdev->bdev,b));
1208                 return -EINVAL;
1209         }
1210         if (le64_to_cpu(sb->data_size) < 10) {
1211                 printk("md: data_size too small on %s\n",
1212                        bdevname(rdev->bdev,b));
1213                 return -EINVAL;
1214         }
1215
1216         rdev->preferred_minor = 0xffff;
1217         rdev->data_offset = le64_to_cpu(sb->data_offset);
1218         atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1219
1220         rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1221         bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1222         if (rdev->sb_size & bmask)
1223                 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1224
1225         if (minor_version
1226             && rdev->data_offset < sb_start + (rdev->sb_size/512))
1227                 return -EINVAL;
1228
1229         if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1230                 rdev->desc_nr = -1;
1231         else
1232                 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1233
1234         if (!refdev) {
1235                 ret = 1;
1236         } else {
1237                 __u64 ev1, ev2;
1238                 struct mdp_superblock_1 *refsb =
1239                         (struct mdp_superblock_1*)page_address(refdev->sb_page);
1240
1241                 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1242                     sb->level != refsb->level ||
1243                     sb->layout != refsb->layout ||
1244                     sb->chunksize != refsb->chunksize) {
1245                         printk(KERN_WARNING "md: %s has strangely different"
1246                                 " superblock to %s\n",
1247                                 bdevname(rdev->bdev,b),
1248                                 bdevname(refdev->bdev,b2));
1249                         return -EINVAL;
1250                 }
1251                 ev1 = le64_to_cpu(sb->events);
1252                 ev2 = le64_to_cpu(refsb->events);
1253
1254                 if (ev1 > ev2)
1255                         ret = 1;
1256                 else
1257                         ret = 0;
1258         }
1259         if (minor_version)
1260                 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1261                         le64_to_cpu(sb->data_offset);
1262         else
1263                 rdev->sectors = rdev->sb_start;
1264         if (rdev->sectors < le64_to_cpu(sb->data_size))
1265                 return -EINVAL;
1266         rdev->sectors = le64_to_cpu(sb->data_size);
1267         if (le64_to_cpu(sb->size) > rdev->sectors)
1268                 return -EINVAL;
1269         return ret;
1270 }
1271
1272 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1273 {
1274         struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1275         __u64 ev1 = le64_to_cpu(sb->events);
1276
1277         rdev->raid_disk = -1;
1278         clear_bit(Faulty, &rdev->flags);
1279         clear_bit(In_sync, &rdev->flags);
1280         clear_bit(WriteMostly, &rdev->flags);
1281         clear_bit(BarriersNotsupp, &rdev->flags);
1282
1283         if (mddev->raid_disks == 0) {
1284                 mddev->major_version = 1;
1285                 mddev->patch_version = 0;
1286                 mddev->external = 0;
1287                 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1288                 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1289                 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1290                 mddev->level = le32_to_cpu(sb->level);
1291                 mddev->clevel[0] = 0;
1292                 mddev->layout = le32_to_cpu(sb->layout);
1293                 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1294                 mddev->dev_sectors = le64_to_cpu(sb->size);
1295                 mddev->events = ev1;
1296                 mddev->bitmap_offset = 0;
1297                 mddev->default_bitmap_offset = 1024 >> 9;
1298
1299                 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1300                 memcpy(mddev->uuid, sb->set_uuid, 16);
1301
1302                 mddev->max_disks =  (4096-256)/2;
1303
1304                 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1305                     mddev->bitmap_file == NULL )
1306                         mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1307
1308                 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1309                         mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1310                         mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1311                         mddev->new_level = le32_to_cpu(sb->new_level);
1312                         mddev->new_layout = le32_to_cpu(sb->new_layout);
1313                         mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1314                 } else {
1315                         mddev->reshape_position = MaxSector;
1316                         mddev->delta_disks = 0;
1317                         mddev->new_level = mddev->level;
1318                         mddev->new_layout = mddev->layout;
1319                         mddev->new_chunk_sectors = mddev->chunk_sectors;
1320                 }
1321
1322         } else if (mddev->pers == NULL) {
1323                 /* Insist of good event counter while assembling */
1324                 ++ev1;
1325                 if (ev1 < mddev->events)
1326                         return -EINVAL;
1327         } else if (mddev->bitmap) {
1328                 /* If adding to array with a bitmap, then we can accept an
1329                  * older device, but not too old.
1330                  */
1331                 if (ev1 < mddev->bitmap->events_cleared)
1332                         return 0;
1333         } else {
1334                 if (ev1 < mddev->events)
1335                         /* just a hot-add of a new device, leave raid_disk at -1 */
1336                         return 0;
1337         }
1338         if (mddev->level != LEVEL_MULTIPATH) {
1339                 int role;
1340                 if (rdev->desc_nr < 0 ||
1341                     rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1342                         role = 0xffff;
1343                         rdev->desc_nr = -1;
1344                 } else
1345                         role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1346                 switch(role) {
1347                 case 0xffff: /* spare */
1348                         break;
1349                 case 0xfffe: /* faulty */
1350                         set_bit(Faulty, &rdev->flags);
1351                         break;
1352                 default:
1353                         if ((le32_to_cpu(sb->feature_map) &
1354                              MD_FEATURE_RECOVERY_OFFSET))
1355                                 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1356                         else
1357                                 set_bit(In_sync, &rdev->flags);
1358                         rdev->raid_disk = role;
1359                         break;
1360                 }
1361                 if (sb->devflags & WriteMostly1)
1362                         set_bit(WriteMostly, &rdev->flags);
1363         } else /* MULTIPATH are always insync */
1364                 set_bit(In_sync, &rdev->flags);
1365
1366         return 0;
1367 }
1368
1369 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1370 {
1371         struct mdp_superblock_1 *sb;
1372         mdk_rdev_t *rdev2;
1373         int max_dev, i;
1374         /* make rdev->sb match mddev and rdev data. */
1375
1376         sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1377
1378         sb->feature_map = 0;
1379         sb->pad0 = 0;
1380         sb->recovery_offset = cpu_to_le64(0);
1381         memset(sb->pad1, 0, sizeof(sb->pad1));
1382         memset(sb->pad2, 0, sizeof(sb->pad2));
1383         memset(sb->pad3, 0, sizeof(sb->pad3));
1384
1385         sb->utime = cpu_to_le64((__u64)mddev->utime);
1386         sb->events = cpu_to_le64(mddev->events);
1387         if (mddev->in_sync)
1388                 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1389         else
1390                 sb->resync_offset = cpu_to_le64(0);
1391
1392         sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1393
1394         sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1395         sb->size = cpu_to_le64(mddev->dev_sectors);
1396         sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1397         sb->level = cpu_to_le32(mddev->level);
1398         sb->layout = cpu_to_le32(mddev->layout);
1399
1400         if (mddev->bitmap && mddev->bitmap_file == NULL) {
1401                 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1402                 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1403         }
1404
1405         if (rdev->raid_disk >= 0 &&
1406             !test_bit(In_sync, &rdev->flags)) {
1407                 if (rdev->recovery_offset > 0) {
1408                         sb->feature_map |=
1409                                 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1410                         sb->recovery_offset =
1411                                 cpu_to_le64(rdev->recovery_offset);
1412                 }
1413         }
1414
1415         if (mddev->reshape_position != MaxSector) {
1416                 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1417                 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1418                 sb->new_layout = cpu_to_le32(mddev->new_layout);
1419                 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1420                 sb->new_level = cpu_to_le32(mddev->new_level);
1421                 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1422         }
1423
1424         max_dev = 0;
1425         list_for_each_entry(rdev2, &mddev->disks, same_set)
1426                 if (rdev2->desc_nr+1 > max_dev)
1427                         max_dev = rdev2->desc_nr+1;
1428
1429         if (max_dev > le32_to_cpu(sb->max_dev)) {
1430                 int bmask;
1431                 sb->max_dev = cpu_to_le32(max_dev);
1432                 rdev->sb_size = max_dev * 2 + 256;
1433                 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1434                 if (rdev->sb_size & bmask)
1435                         rdev->sb_size = (rdev->sb_size | bmask) + 1;
1436         }
1437         for (i=0; i<max_dev;i++)
1438                 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1439
1440         list_for_each_entry(rdev2, &mddev->disks, same_set) {
1441                 i = rdev2->desc_nr;
1442                 if (test_bit(Faulty, &rdev2->flags))
1443                         sb->dev_roles[i] = cpu_to_le16(0xfffe);
1444                 else if (test_bit(In_sync, &rdev2->flags))
1445                         sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1446                 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1447                         sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1448                 else
1449                         sb->dev_roles[i] = cpu_to_le16(0xffff);
1450         }
1451
1452         sb->sb_csum = calc_sb_1_csum(sb);
1453 }
1454
1455 static unsigned long long
1456 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1457 {
1458         struct mdp_superblock_1 *sb;
1459         sector_t max_sectors;
1460         if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1461                 return 0; /* component must fit device */
1462         if (rdev->sb_start < rdev->data_offset) {
1463                 /* minor versions 1 and 2; superblock before data */
1464                 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1465                 max_sectors -= rdev->data_offset;
1466                 if (!num_sectors || num_sectors > max_sectors)
1467                         num_sectors = max_sectors;
1468         } else if (rdev->mddev->bitmap_offset) {
1469                 /* minor version 0 with bitmap we can't move */
1470                 return 0;
1471         } else {
1472                 /* minor version 0; superblock after data */
1473                 sector_t sb_start;
1474                 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1475                 sb_start &= ~(sector_t)(4*2 - 1);
1476                 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1477                 if (!num_sectors || num_sectors > max_sectors)
1478                         num_sectors = max_sectors;
1479                 rdev->sb_start = sb_start;
1480         }
1481         sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1482         sb->data_size = cpu_to_le64(num_sectors);
1483         sb->super_offset = rdev->sb_start;
1484         sb->sb_csum = calc_sb_1_csum(sb);
1485         md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1486                        rdev->sb_page);
1487         md_super_wait(rdev->mddev);
1488         return num_sectors / 2; /* kB for sysfs */
1489 }
1490
1491 static struct super_type super_types[] = {
1492         [0] = {
1493                 .name   = "0.90.0",
1494                 .owner  = THIS_MODULE,
1495                 .load_super         = super_90_load,
1496                 .validate_super     = super_90_validate,
1497                 .sync_super         = super_90_sync,
1498                 .rdev_size_change   = super_90_rdev_size_change,
1499         },
1500         [1] = {
1501                 .name   = "md-1",
1502                 .owner  = THIS_MODULE,
1503                 .load_super         = super_1_load,
1504                 .validate_super     = super_1_validate,
1505                 .sync_super         = super_1_sync,
1506                 .rdev_size_change   = super_1_rdev_size_change,
1507         },
1508 };
1509
1510 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1511 {
1512         mdk_rdev_t *rdev, *rdev2;
1513
1514         rcu_read_lock();
1515         rdev_for_each_rcu(rdev, mddev1)
1516                 rdev_for_each_rcu(rdev2, mddev2)
1517                         if (rdev->bdev->bd_contains ==
1518                             rdev2->bdev->bd_contains) {
1519                                 rcu_read_unlock();
1520                                 return 1;
1521                         }
1522         rcu_read_unlock();
1523         return 0;
1524 }
1525
1526 static LIST_HEAD(pending_raid_disks);
1527
1528 /*
1529  * Try to register data integrity profile for an mddev
1530  *
1531  * This is called when an array is started and after a disk has been kicked
1532  * from the array. It only succeeds if all working and active component devices
1533  * are integrity capable with matching profiles.
1534  */
1535 int md_integrity_register(mddev_t *mddev)
1536 {
1537         mdk_rdev_t *rdev, *reference = NULL;
1538
1539         if (list_empty(&mddev->disks))
1540                 return 0; /* nothing to do */
1541         if (blk_get_integrity(mddev->gendisk))
1542                 return 0; /* already registered */
1543         list_for_each_entry(rdev, &mddev->disks, same_set) {
1544                 /* skip spares and non-functional disks */
1545                 if (test_bit(Faulty, &rdev->flags))
1546                         continue;
1547                 if (rdev->raid_disk < 0)
1548                         continue;
1549                 /*
1550                  * If at least one rdev is not integrity capable, we can not
1551                  * enable data integrity for the md device.
1552                  */
1553                 if (!bdev_get_integrity(rdev->bdev))
1554                         return -EINVAL;
1555                 if (!reference) {
1556                         /* Use the first rdev as the reference */
1557                         reference = rdev;
1558                         continue;
1559                 }
1560                 /* does this rdev's profile match the reference profile? */
1561                 if (blk_integrity_compare(reference->bdev->bd_disk,
1562                                 rdev->bdev->bd_disk) < 0)
1563                         return -EINVAL;
1564         }
1565         /*
1566          * All component devices are integrity capable and have matching
1567          * profiles, register the common profile for the md device.
1568          */
1569         if (blk_integrity_register(mddev->gendisk,
1570                         bdev_get_integrity(reference->bdev)) != 0) {
1571                 printk(KERN_ERR "md: failed to register integrity for %s\n",
1572                         mdname(mddev));
1573                 return -EINVAL;
1574         }
1575         printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1576                 mdname(mddev));
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(md_integrity_register);
1580
1581 /* Disable data integrity if non-capable/non-matching disk is being added */
1582 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1583 {
1584         struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1585         struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1586
1587         if (!bi_mddev) /* nothing to do */
1588                 return;
1589         if (rdev->raid_disk < 0) /* skip spares */
1590                 return;
1591         if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1592                                              rdev->bdev->bd_disk) >= 0)
1593                 return;
1594         printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1595         blk_integrity_unregister(mddev->gendisk);
1596 }
1597 EXPORT_SYMBOL(md_integrity_add_rdev);
1598
1599 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1600 {
1601         char b[BDEVNAME_SIZE];
1602         struct kobject *ko;
1603         char *s;
1604         int err;
1605
1606         if (rdev->mddev) {
1607                 MD_BUG();
1608                 return -EINVAL;
1609         }
1610
1611         /* prevent duplicates */
1612         if (find_rdev(mddev, rdev->bdev->bd_dev))
1613                 return -EEXIST;
1614
1615         /* make sure rdev->sectors exceeds mddev->dev_sectors */
1616         if (rdev->sectors && (mddev->dev_sectors == 0 ||
1617                         rdev->sectors < mddev->dev_sectors)) {
1618                 if (mddev->pers) {
1619                         /* Cannot change size, so fail
1620                          * If mddev->level <= 0, then we don't care
1621                          * about aligning sizes (e.g. linear)
1622                          */
1623                         if (mddev->level > 0)
1624                                 return -ENOSPC;
1625                 } else
1626                         mddev->dev_sectors = rdev->sectors;
1627         }
1628
1629         /* Verify rdev->desc_nr is unique.
1630          * If it is -1, assign a free number, else
1631          * check number is not in use
1632          */
1633         if (rdev->desc_nr < 0) {
1634                 int choice = 0;
1635                 if (mddev->pers) choice = mddev->raid_disks;
1636                 while (find_rdev_nr(mddev, choice))
1637                         choice++;
1638                 rdev->desc_nr = choice;
1639         } else {
1640                 if (find_rdev_nr(mddev, rdev->desc_nr))
1641                         return -EBUSY;
1642         }
1643         if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1644                 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1645                        mdname(mddev), mddev->max_disks);
1646                 return -EBUSY;
1647         }
1648         bdevname(rdev->bdev,b);
1649         while ( (s=strchr(b, '/')) != NULL)
1650                 *s = '!';
1651
1652         rdev->mddev = mddev;
1653         printk(KERN_INFO "md: bind<%s>\n", b);
1654
1655         if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1656                 goto fail;
1657
1658         ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1659         if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1660                 kobject_del(&rdev->kobj);
1661                 goto fail;
1662         }
1663         rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1664
1665         list_add_rcu(&rdev->same_set, &mddev->disks);
1666         bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1667
1668         /* May as well allow recovery to be retried once */
1669         mddev->recovery_disabled = 0;
1670
1671         return 0;
1672
1673  fail:
1674         printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1675                b, mdname(mddev));
1676         return err;
1677 }
1678
1679 static void md_delayed_delete(struct work_struct *ws)
1680 {
1681         mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1682         kobject_del(&rdev->kobj);
1683         kobject_put(&rdev->kobj);
1684 }
1685
1686 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1687 {
1688         char b[BDEVNAME_SIZE];
1689         if (!rdev->mddev) {
1690                 MD_BUG();
1691                 return;
1692         }
1693         bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1694         list_del_rcu(&rdev->same_set);
1695         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1696         rdev->mddev = NULL;
1697         sysfs_remove_link(&rdev->kobj, "block");
1698         sysfs_put(rdev->sysfs_state);
1699         rdev->sysfs_state = NULL;
1700         /* We need to delay this, otherwise we can deadlock when
1701          * writing to 'remove' to "dev/state".  We also need
1702          * to delay it due to rcu usage.
1703          */
1704         synchronize_rcu();
1705         INIT_WORK(&rdev->del_work, md_delayed_delete);
1706         kobject_get(&rdev->kobj);
1707         schedule_work(&rdev->del_work);
1708 }
1709
1710 /*
1711  * prevent the device from being mounted, repartitioned or
1712  * otherwise reused by a RAID array (or any other kernel
1713  * subsystem), by bd_claiming the device.
1714  */
1715 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1716 {
1717         int err = 0;
1718         struct block_device *bdev;
1719         char b[BDEVNAME_SIZE];
1720
1721         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1722         if (IS_ERR(bdev)) {
1723                 printk(KERN_ERR "md: could not open %s.\n",
1724                         __bdevname(dev, b));
1725                 return PTR_ERR(bdev);
1726         }
1727         err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1728         if (err) {
1729                 printk(KERN_ERR "md: could not bd_claim %s.\n",
1730                         bdevname(bdev, b));
1731                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1732                 return err;
1733         }
1734         if (!shared)
1735                 set_bit(AllReserved, &rdev->flags);
1736         rdev->bdev = bdev;
1737         return err;
1738 }
1739
1740 static void unlock_rdev(mdk_rdev_t *rdev)
1741 {
1742         struct block_device *bdev = rdev->bdev;
1743         rdev->bdev = NULL;
1744         if (!bdev)
1745                 MD_BUG();
1746         bd_release(bdev);
1747         blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1748 }
1749
1750 void md_autodetect_dev(dev_t dev);
1751
1752 static void export_rdev(mdk_rdev_t * rdev)
1753 {
1754         char b[BDEVNAME_SIZE];
1755         printk(KERN_INFO "md: export_rdev(%s)\n",
1756                 bdevname(rdev->bdev,b));
1757         if (rdev->mddev)
1758                 MD_BUG();
1759         free_disk_sb(rdev);
1760 #ifndef MODULE
1761         if (test_bit(AutoDetected, &rdev->flags))
1762                 md_autodetect_dev(rdev->bdev->bd_dev);
1763 #endif
1764         unlock_rdev(rdev);
1765         kobject_put(&rdev->kobj);
1766 }
1767
1768 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1769 {
1770         unbind_rdev_from_array(rdev);
1771         export_rdev(rdev);
1772 }
1773
1774 static void export_array(mddev_t *mddev)
1775 {
1776         mdk_rdev_t *rdev, *tmp;
1777
1778         rdev_for_each(rdev, tmp, mddev) {
1779                 if (!rdev->mddev) {
1780                         MD_BUG();
1781                         continue;
1782                 }
1783                 kick_rdev_from_array(rdev);
1784         }
1785         if (!list_empty(&mddev->disks))
1786                 MD_BUG();
1787         mddev->raid_disks = 0;
1788         mddev->major_version = 0;
1789 }
1790
1791 static void print_desc(mdp_disk_t *desc)
1792 {
1793         printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1794                 desc->major,desc->minor,desc->raid_disk,desc->state);
1795 }
1796
1797 static void print_sb_90(mdp_super_t *sb)
1798 {
1799         int i;
1800
1801         printk(KERN_INFO
1802                 "md:  SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1803                 sb->major_version, sb->minor_version, sb->patch_version,
1804                 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1805                 sb->ctime);
1806         printk(KERN_INFO "md:     L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1807                 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1808                 sb->md_minor, sb->layout, sb->chunk_size);
1809         printk(KERN_INFO "md:     UT:%08x ST:%d AD:%d WD:%d"
1810                 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1811                 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1812                 sb->failed_disks, sb->spare_disks,
1813                 sb->sb_csum, (unsigned long)sb->events_lo);
1814
1815         printk(KERN_INFO);
1816         for (i = 0; i < MD_SB_DISKS; i++) {
1817                 mdp_disk_t *desc;
1818
1819                 desc = sb->disks + i;
1820                 if (desc->number || desc->major || desc->minor ||
1821                     desc->raid_disk || (desc->state && (desc->state != 4))) {
1822                         printk("     D %2d: ", i);
1823                         print_desc(desc);
1824                 }
1825         }
1826         printk(KERN_INFO "md:     THIS: ");
1827         print_desc(&sb->this_disk);
1828 }
1829
1830 static void print_sb_1(struct mdp_superblock_1 *sb)
1831 {
1832         __u8 *uuid;
1833
1834         uuid = sb->set_uuid;
1835         printk(KERN_INFO
1836                "md:  SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1837                ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1838                "md:    Name: \"%s\" CT:%llu\n",
1839                 le32_to_cpu(sb->major_version),
1840                 le32_to_cpu(sb->feature_map),
1841                 uuid[0], uuid[1], uuid[2], uuid[3],
1842                 uuid[4], uuid[5], uuid[6], uuid[7],
1843                 uuid[8], uuid[9], uuid[10], uuid[11],
1844                 uuid[12], uuid[13], uuid[14], uuid[15],
1845                 sb->set_name,
1846                 (unsigned long long)le64_to_cpu(sb->ctime)
1847                        & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1848
1849         uuid = sb->device_uuid;
1850         printk(KERN_INFO
1851                "md:       L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1852                         " RO:%llu\n"
1853                "md:     Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1854                         ":%02x%02x%02x%02x%02x%02x\n"
1855                "md:       (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1856                "md:         (MaxDev:%u) \n",
1857                 le32_to_cpu(sb->level),
1858                 (unsigned long long)le64_to_cpu(sb->size),
1859                 le32_to_cpu(sb->raid_disks),
1860                 le32_to_cpu(sb->layout),
1861                 le32_to_cpu(sb->chunksize),
1862                 (unsigned long long)le64_to_cpu(sb->data_offset),
1863                 (unsigned long long)le64_to_cpu(sb->data_size),
1864                 (unsigned long long)le64_to_cpu(sb->super_offset),
1865                 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1866                 le32_to_cpu(sb->dev_number),
1867                 uuid[0], uuid[1], uuid[2], uuid[3],
1868                 uuid[4], uuid[5], uuid[6], uuid[7],
1869                 uuid[8], uuid[9], uuid[10], uuid[11],
1870                 uuid[12], uuid[13], uuid[14], uuid[15],
1871                 sb->devflags,
1872                 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1873                 (unsigned long long)le64_to_cpu(sb->events),
1874                 (unsigned long long)le64_to_cpu(sb->resync_offset),
1875                 le32_to_cpu(sb->sb_csum),
1876                 le32_to_cpu(sb->max_dev)
1877                 );
1878 }
1879
1880 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1881 {
1882         char b[BDEVNAME_SIZE];
1883         printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1884                 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1885                 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1886                 rdev->desc_nr);
1887         if (rdev->sb_loaded) {
1888                 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1889                 switch (major_version) {
1890                 case 0:
1891                         print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1892                         break;
1893                 case 1:
1894                         print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1895                         break;
1896                 }
1897         } else
1898                 printk(KERN_INFO "md: no rdev superblock!\n");
1899 }
1900
1901 static void md_print_devices(void)
1902 {
1903         struct list_head *tmp;
1904         mdk_rdev_t *rdev;
1905         mddev_t *mddev;
1906         char b[BDEVNAME_SIZE];
1907
1908         printk("\n");
1909         printk("md:     **********************************\n");
1910         printk("md:     * <COMPLETE RAID STATE PRINTOUT> *\n");
1911         printk("md:     **********************************\n");
1912         for_each_mddev(mddev, tmp) {
1913
1914                 if (mddev->bitmap)
1915                         bitmap_print_sb(mddev->bitmap);
1916                 else
1917                         printk("%s: ", mdname(mddev));
1918                 list_for_each_entry(rdev, &mddev->disks, same_set)
1919                         printk("<%s>", bdevname(rdev->bdev,b));
1920                 printk("\n");
1921
1922                 list_for_each_entry(rdev, &mddev->disks, same_set)
1923                         print_rdev(rdev, mddev->major_version);
1924         }
1925         printk("md:     **********************************\n");
1926         printk("\n");
1927 }
1928
1929
1930 static void sync_sbs(mddev_t * mddev, int nospares)
1931 {
1932         /* Update each superblock (in-memory image), but
1933          * if we are allowed to, skip spares which already
1934          * have the right event counter, or have one earlier
1935          * (which would mean they aren't being marked as dirty
1936          * with the rest of the array)
1937          */
1938         mdk_rdev_t *rdev;
1939
1940         /* First make sure individual recovery_offsets are correct */
1941         list_for_each_entry(rdev, &mddev->disks, same_set) {
1942                 if (rdev->raid_disk >= 0 &&
1943                     !test_bit(In_sync, &rdev->flags) &&
1944                     mddev->curr_resync_completed > rdev->recovery_offset)
1945                                 rdev->recovery_offset = mddev->curr_resync_completed;
1946
1947         }
1948         list_for_each_entry(rdev, &mddev->disks, same_set) {
1949                 if (rdev->sb_events == mddev->events ||
1950                     (nospares &&
1951                      rdev->raid_disk < 0 &&
1952                      (rdev->sb_events&1)==0 &&
1953                      rdev->sb_events+1 == mddev->events)) {
1954                         /* Don't update this superblock */
1955                         rdev->sb_loaded = 2;
1956                 } else {
1957                         super_types[mddev->major_version].
1958                                 sync_super(mddev, rdev);
1959                         rdev->sb_loaded = 1;
1960                 }
1961         }
1962 }
1963
1964 static void md_update_sb(mddev_t * mddev, int force_change)
1965 {
1966         mdk_rdev_t *rdev;
1967         int sync_req;
1968         int nospares = 0;
1969
1970         mddev->utime = get_seconds();
1971         if (mddev->external)
1972                 return;
1973 repeat:
1974         spin_lock_irq(&mddev->write_lock);
1975
1976         set_bit(MD_CHANGE_PENDING, &mddev->flags);
1977         if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1978                 force_change = 1;
1979         if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1980                 /* just a clean<-> dirty transition, possibly leave spares alone,
1981                  * though if events isn't the right even/odd, we will have to do
1982                  * spares after all
1983                  */
1984                 nospares = 1;
1985         if (force_change)
1986                 nospares = 0;
1987         if (mddev->degraded)
1988                 /* If the array is degraded, then skipping spares is both
1989                  * dangerous and fairly pointless.
1990                  * Dangerous because a device that was removed from the array
1991                  * might have a event_count that still looks up-to-date,
1992                  * so it can be re-added without a resync.
1993                  * Pointless because if there are any spares to skip,
1994                  * then a recovery will happen and soon that array won't
1995                  * be degraded any more and the spare can go back to sleep then.
1996                  */
1997                 nospares = 0;
1998
1999         sync_req = mddev->in_sync;
2000
2001         /* If this is just a dirty<->clean transition, and the array is clean
2002          * and 'events' is odd, we can roll back to the previous clean state */
2003         if (nospares
2004             && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2005             && (mddev->events & 1)
2006             && mddev->events != 1)
2007                 mddev->events--;
2008         else {
2009                 /* otherwise we have to go forward and ... */
2010                 mddev->events ++;
2011                 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
2012                         /* .. if the array isn't clean, an 'even' event must also go
2013                          * to spares. */
2014                         if ((mddev->events&1)==0)
2015                                 nospares = 0;
2016                 } else {
2017                         /* otherwise an 'odd' event must go to spares */
2018                         if ((mddev->events&1))
2019                                 nospares = 0;
2020                 }
2021         }
2022
2023         if (!mddev->events) {
2024                 /*
2025                  * oops, this 64-bit counter should never wrap.
2026                  * Either we are in around ~1 trillion A.C., assuming
2027                  * 1 reboot per second, or we have a bug:
2028                  */
2029                 MD_BUG();
2030                 mddev->events --;
2031         }
2032
2033         /*
2034          * do not write anything to disk if using
2035          * nonpersistent superblocks
2036          */
2037         if (!mddev->persistent) {
2038                 if (!mddev->external)
2039                         clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2040
2041                 spin_unlock_irq(&mddev->write_lock);
2042                 wake_up(&mddev->sb_wait);
2043                 return;
2044         }
2045         sync_sbs(mddev, nospares);
2046         spin_unlock_irq(&mddev->write_lock);
2047
2048         dprintk(KERN_INFO
2049                 "md: updating %s RAID superblock on device (in sync %d)\n",
2050                 mdname(mddev),mddev->in_sync);
2051
2052         bitmap_update_sb(mddev->bitmap);
2053         list_for_each_entry(rdev, &mddev->disks, same_set) {
2054                 char b[BDEVNAME_SIZE];
2055                 dprintk(KERN_INFO "md: ");
2056                 if (rdev->sb_loaded != 1)
2057                         continue; /* no noise on spare devices */
2058                 if (test_bit(Faulty, &rdev->flags))
2059                         dprintk("(skipping faulty ");
2060
2061                 dprintk("%s ", bdevname(rdev->bdev,b));
2062                 if (!test_bit(Faulty, &rdev->flags)) {
2063                         md_super_write(mddev,rdev,
2064                                        rdev->sb_start, rdev->sb_size,
2065                                        rdev->sb_page);
2066                         dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2067                                 bdevname(rdev->bdev,b),
2068                                 (unsigned long long)rdev->sb_start);
2069                         rdev->sb_events = mddev->events;
2070
2071                 } else
2072                         dprintk(")\n");
2073                 if (mddev->level == LEVEL_MULTIPATH)
2074                         /* only need to write one superblock... */
2075                         break;
2076         }
2077         md_super_wait(mddev);
2078         /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2079
2080         spin_lock_irq(&mddev->write_lock);
2081         if (mddev->in_sync != sync_req ||
2082             test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2083                 /* have to write it out again */
2084                 spin_unlock_irq(&mddev->write_lock);
2085                 goto repeat;
2086         }
2087         clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2088         spin_unlock_irq(&mddev->write_lock);
2089         wake_up(&mddev->sb_wait);
2090         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2091                 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2092
2093 }
2094
2095 /* words written to sysfs files may, or may not, be \n terminated.
2096  * We want to accept with case. For this we use cmd_match.
2097  */
2098 static int cmd_match(const char *cmd, const char *str)
2099 {
2100         /* See if cmd, written into a sysfs file, matches
2101          * str.  They must either be the same, or cmd can
2102          * have a trailing newline
2103          */
2104         while (*cmd && *str && *cmd == *str) {
2105                 cmd++;
2106                 str++;
2107         }
2108         if (*cmd == '\n')
2109                 cmd++;
2110         if (*str || *cmd)
2111                 return 0;
2112         return 1;
2113 }
2114
2115 struct rdev_sysfs_entry {
2116         struct attribute attr;
2117         ssize_t (*show)(mdk_rdev_t *, char *);
2118         ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2119 };
2120
2121 static ssize_t
2122 state_show(mdk_rdev_t *rdev, char *page)
2123 {
2124         char *sep = "";
2125         size_t len = 0;
2126
2127         if (test_bit(Faulty, &rdev->flags)) {
2128                 len+= sprintf(page+len, "%sfaulty",sep);
2129                 sep = ",";
2130         }
2131         if (test_bit(In_sync, &rdev->flags)) {
2132                 len += sprintf(page+len, "%sin_sync",sep);
2133                 sep = ",";
2134         }
2135         if (test_bit(WriteMostly, &rdev->flags)) {
2136                 len += sprintf(page+len, "%swrite_mostly",sep);
2137                 sep = ",";
2138         }
2139         if (test_bit(Blocked, &rdev->flags)) {
2140                 len += sprintf(page+len, "%sblocked", sep);
2141                 sep = ",";
2142         }
2143         if (!test_bit(Faulty, &rdev->flags) &&
2144             !test_bit(In_sync, &rdev->flags)) {
2145                 len += sprintf(page+len, "%sspare", sep);
2146                 sep = ",";
2147         }
2148         return len+sprintf(page+len, "\n");
2149 }
2150
2151 static ssize_t
2152 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2153 {
2154         /* can write
2155          *  faulty  - simulates and error
2156          *  remove  - disconnects the device
2157          *  writemostly - sets write_mostly
2158          *  -writemostly - clears write_mostly
2159          *  blocked - sets the Blocked flag
2160          *  -blocked - clears the Blocked flag
2161          *  insync - sets Insync providing device isn't active
2162          */
2163         int err = -EINVAL;
2164         if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2165                 md_error(rdev->mddev, rdev);
2166                 err = 0;
2167         } else if (cmd_match(buf, "remove")) {
2168                 if (rdev->raid_disk >= 0)
2169                         err = -EBUSY;
2170                 else {
2171                         mddev_t *mddev = rdev->mddev;
2172                         kick_rdev_from_array(rdev);
2173                         if (mddev->pers)
2174                                 md_update_sb(mddev, 1);
2175                         md_new_event(mddev);
2176                         err = 0;
2177                 }
2178         } else if (cmd_match(buf, "writemostly")) {
2179                 set_bit(WriteMostly, &rdev->flags);
2180                 err = 0;
2181         } else if (cmd_match(buf, "-writemostly")) {
2182                 clear_bit(WriteMostly, &rdev->flags);
2183                 err = 0;
2184         } else if (cmd_match(buf, "blocked")) {
2185                 set_bit(Blocked, &rdev->flags);
2186                 err = 0;
2187         } else if (cmd_match(buf, "-blocked")) {
2188                 clear_bit(Blocked, &rdev->flags);
2189                 wake_up(&rdev->blocked_wait);
2190                 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2191                 md_wakeup_thread(rdev->mddev->thread);
2192
2193                 err = 0;
2194         } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2195                 set_bit(In_sync, &rdev->flags);
2196                 err = 0;
2197         }
2198         if (!err && rdev->sysfs_state)
2199                 sysfs_notify_dirent(rdev->sysfs_state);
2200         return err ? err : len;
2201 }
2202 static struct rdev_sysfs_entry rdev_state =
2203 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2204
2205 static ssize_t
2206 errors_show(mdk_rdev_t *rdev, char *page)
2207 {
2208         return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2209 }
2210
2211 static ssize_t
2212 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2213 {
2214         char *e;
2215         unsigned long n = simple_strtoul(buf, &e, 10);
2216         if (*buf && (*e == 0 || *e == '\n')) {
2217                 atomic_set(&rdev->corrected_errors, n);
2218                 return len;
2219         }
2220         return -EINVAL;
2221 }
2222 static struct rdev_sysfs_entry rdev_errors =
2223 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2224
2225 static ssize_t
2226 slot_show(mdk_rdev_t *rdev, char *page)
2227 {
2228         if (rdev->raid_disk < 0)
2229                 return sprintf(page, "none\n");
2230         else
2231                 return sprintf(page, "%d\n", rdev->raid_disk);
2232 }
2233
2234 static ssize_t
2235 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2236 {
2237         char *e;
2238         int err;
2239         char nm[20];
2240         int slot = simple_strtoul(buf, &e, 10);
2241         if (strncmp(buf, "none", 4)==0)
2242                 slot = -1;
2243         else if (e==buf || (*e && *e!= '\n'))
2244                 return -EINVAL;
2245         if (rdev->mddev->pers && slot == -1) {
2246                 /* Setting 'slot' on an active array requires also
2247                  * updating the 'rd%d' link, and communicating
2248                  * with the personality with ->hot_*_disk.
2249                  * For now we only support removing
2250                  * failed/spare devices.  This normally happens automatically,
2251                  * but not when the metadata is externally managed.
2252                  */
2253                 if (rdev->raid_disk == -1)
2254                         return -EEXIST;
2255                 /* personality does all needed checks */
2256                 if (rdev->mddev->pers->hot_add_disk == NULL)
2257                         return -EINVAL;
2258                 err = rdev->mddev->pers->
2259                         hot_remove_disk(rdev->mddev, rdev->raid_disk);
2260                 if (err)
2261                         return err;
2262                 sprintf(nm, "rd%d", rdev->raid_disk);
2263                 sysfs_remove_link(&rdev->mddev->kobj, nm);
2264                 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2265                 md_wakeup_thread(rdev->mddev->thread);
2266         } else if (rdev->mddev->pers) {
2267                 mdk_rdev_t *rdev2;
2268                 /* Activating a spare .. or possibly reactivating
2269                  * if we ever get bitmaps working here.
2270                  */
2271
2272                 if (rdev->raid_disk != -1)
2273                         return -EBUSY;
2274
2275                 if (rdev->mddev->pers->hot_add_disk == NULL)
2276                         return -EINVAL;
2277
2278                 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2279                         if (rdev2->raid_disk == slot)
2280                                 return -EEXIST;
2281
2282                 rdev->raid_disk = slot;
2283                 if (test_bit(In_sync, &rdev->flags))
2284                         rdev->saved_raid_disk = slot;
2285                 else
2286                         rdev->saved_raid_disk = -1;
2287                 err = rdev->mddev->pers->
2288                         hot_add_disk(rdev->mddev, rdev);
2289                 if (err) {
2290                         rdev->raid_disk = -1;
2291                         return err;
2292                 } else
2293                         sysfs_notify_dirent(rdev->sysfs_state);
2294                 sprintf(nm, "rd%d", rdev->raid_disk);
2295                 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2296                         printk(KERN_WARNING
2297                                "md: cannot register "
2298                                "%s for %s\n",
2299                                nm, mdname(rdev->mddev));
2300
2301                 /* don't wakeup anyone, leave that to userspace. */
2302         } else {
2303                 if (slot >= rdev->mddev->raid_disks)
2304                         return -ENOSPC;
2305                 rdev->raid_disk = slot;
2306                 /* assume it is working */
2307                 clear_bit(Faulty, &rdev->flags);
2308                 clear_bit(WriteMostly, &rdev->flags);
2309                 set_bit(In_sync, &rdev->flags);
2310                 sysfs_notify_dirent(rdev->sysfs_state);
2311         }
2312         return len;
2313 }
2314
2315
2316 static struct rdev_sysfs_entry rdev_slot =
2317 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2318
2319 static ssize_t
2320 offset_show(mdk_rdev_t *rdev, char *page)
2321 {
2322         return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2323 }
2324
2325 static ssize_t
2326 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2327 {
2328         char *e;
2329         unsigned long long offset = simple_strtoull(buf, &e, 10);
2330         if (e==buf || (*e && *e != '\n'))
2331                 return -EINVAL;
2332         if (rdev->mddev->pers && rdev->raid_disk >= 0)
2333                 return -EBUSY;
2334         if (rdev->sectors && rdev->mddev->external)
2335                 /* Must set offset before size, so overlap checks
2336                  * can be sane */
2337                 return -EBUSY;
2338         rdev->data_offset = offset;
2339         return len;
2340 }
2341
2342 static struct rdev_sysfs_entry rdev_offset =
2343 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2344
2345 static ssize_t
2346 rdev_size_show(mdk_rdev_t *rdev, char *page)
2347 {
2348         return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2349 }
2350
2351 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2352 {
2353         /* check if two start/length pairs overlap */
2354         if (s1+l1 <= s2)
2355                 return 0;
2356         if (s2+l2 <= s1)
2357                 return 0;
2358         return 1;
2359 }
2360
2361 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2362 {
2363         unsigned long long blocks;
2364         sector_t new;
2365
2366         if (strict_strtoull(buf, 10, &blocks) < 0)
2367                 return -EINVAL;
2368
2369         if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2370                 return -EINVAL; /* sector conversion overflow */
2371
2372         new = blocks * 2;
2373         if (new != blocks * 2)
2374                 return -EINVAL; /* unsigned long long to sector_t overflow */
2375
2376         *sectors = new;
2377         return 0;
2378 }
2379
2380 static ssize_t
2381 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2382 {
2383         mddev_t *my_mddev = rdev->mddev;
2384         sector_t oldsectors = rdev->sectors;
2385         sector_t sectors;
2386
2387         if (strict_blocks_to_sectors(buf, &sectors) < 0)
2388                 return -EINVAL;
2389         if (my_mddev->pers && rdev->raid_disk >= 0) {
2390                 if (my_mddev->persistent) {
2391                         sectors = super_types[my_mddev->major_version].
2392                                 rdev_size_change(rdev, sectors);
2393                         if (!sectors)
2394                                 return -EBUSY;
2395                 } else if (!sectors)
2396                         sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2397                                 rdev->data_offset;
2398         }
2399         if (sectors < my_mddev->dev_sectors)
2400                 return -EINVAL; /* component must fit device */
2401
2402         rdev->sectors = sectors;
2403         if (sectors > oldsectors && my_mddev->external) {
2404                 /* need to check that all other rdevs with the same ->bdev
2405                  * do not overlap.  We need to unlock the mddev to avoid
2406                  * a deadlock.  We have already changed rdev->sectors, and if
2407                  * we have to change it back, we will have the lock again.
2408                  */
2409                 mddev_t *mddev;
2410                 int overlap = 0;
2411                 struct list_head *tmp;
2412
2413                 mddev_unlock(my_mddev);
2414                 for_each_mddev(mddev, tmp) {
2415                         mdk_rdev_t *rdev2;
2416
2417                         mddev_lock(mddev);
2418                         list_for_each_entry(rdev2, &mddev->disks, same_set)
2419                                 if (test_bit(AllReserved, &rdev2->flags) ||
2420                                     (rdev->bdev == rdev2->bdev &&
2421                                      rdev != rdev2 &&
2422                                      overlaps(rdev->data_offset, rdev->sectors,
2423                                               rdev2->data_offset,
2424                                               rdev2->sectors))) {
2425                                         overlap = 1;
2426                                         break;
2427                                 }
2428                         mddev_unlock(mddev);
2429                         if (overlap) {
2430                                 mddev_put(mddev);
2431                                 break;
2432                         }
2433                 }
2434                 mddev_lock(my_mddev);
2435                 if (overlap) {
2436                         /* Someone else could have slipped in a size
2437                          * change here, but doing so is just silly.
2438                          * We put oldsectors back because we *know* it is
2439                          * safe, and trust userspace not to race with
2440                          * itself
2441                          */
2442                         rdev->sectors = oldsectors;
2443                         return -EBUSY;
2444                 }
2445         }
2446         return len;
2447 }
2448
2449 static struct rdev_sysfs_entry rdev_size =
2450 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2451
2452 static struct attribute *rdev_default_attrs[] = {
2453         &rdev_state.attr,
2454         &rdev_errors.attr,
2455         &rdev_slot.attr,
2456         &rdev_offset.attr,
2457         &rdev_size.attr,
2458         NULL,
2459 };
2460 static ssize_t
2461 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2462 {
2463         struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2464         mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2465         mddev_t *mddev = rdev->mddev;
2466         ssize_t rv;
2467
2468         if (!entry->show)
2469                 return -EIO;
2470
2471         rv = mddev ? mddev_lock(mddev) : -EBUSY;
2472         if (!rv) {
2473                 if (rdev->mddev == NULL)
2474                         rv = -EBUSY;
2475                 else
2476                         rv = entry->show(rdev, page);
2477                 mddev_unlock(mddev);
2478         }
2479         return rv;
2480 }
2481
2482 static ssize_t
2483 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2484               const char *page, size_t length)
2485 {
2486         struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2487         mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2488         ssize_t rv;
2489         mddev_t *mddev = rdev->mddev;
2490
2491         if (!entry->store)
2492                 return -EIO;
2493         if (!capable(CAP_SYS_ADMIN))
2494                 return -EACCES;
2495         rv = mddev ? mddev_lock(mddev): -EBUSY;
2496         if (!rv) {
2497                 if (rdev->mddev == NULL)
2498                         rv = -EBUSY;
2499                 else
2500                         rv = entry->store(rdev, page, length);
2501                 mddev_unlock(mddev);
2502         }
2503         return rv;
2504 }
2505
2506 static void rdev_free(struct kobject *ko)
2507 {
2508         mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2509         kfree(rdev);
2510 }
2511 static struct sysfs_ops rdev_sysfs_ops = {
2512         .show           = rdev_attr_show,
2513         .store          = rdev_attr_store,
2514 };
2515 static struct kobj_type rdev_ktype = {
2516         .release        = rdev_free,
2517         .sysfs_ops      = &rdev_sysfs_ops,
2518         .default_attrs  = rdev_default_attrs,
2519 };
2520
2521 /*
2522  * Import a device. If 'super_format' >= 0, then sanity check the superblock
2523  *
2524  * mark the device faulty if:
2525  *
2526  *   - the device is nonexistent (zero size)
2527  *   - the device has no valid superblock
2528  *
2529  * a faulty rdev _never_ has rdev->sb set.
2530  */
2531 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2532 {
2533         char b[BDEVNAME_SIZE];
2534         int err;
2535         mdk_rdev_t *rdev;
2536         sector_t size;
2537
2538         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2539         if (!rdev) {
2540                 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2541                 return ERR_PTR(-ENOMEM);
2542         }
2543
2544         if ((err = alloc_disk_sb(rdev)))
2545                 goto abort_free;
2546
2547         err = lock_rdev(rdev, newdev, super_format == -2);
2548         if (err)
2549                 goto abort_free;
2550
2551         kobject_init(&rdev->kobj, &rdev_ktype);
2552
2553         rdev->desc_nr = -1;
2554         rdev->saved_raid_disk = -1;
2555         rdev->raid_disk = -1;
2556         rdev->flags = 0;
2557         rdev->data_offset = 0;
2558         rdev->sb_events = 0;
2559         atomic_set(&rdev->nr_pending, 0);
2560         atomic_set(&rdev->read_errors, 0);
2561         atomic_set(&rdev->corrected_errors, 0);
2562
2563         size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2564         if (!size) {
2565                 printk(KERN_WARNING
2566                         "md: %s has zero or unknown size, marking faulty!\n",
2567                         bdevname(rdev->bdev,b));
2568                 err = -EINVAL;
2569                 goto abort_free;
2570         }
2571
2572         if (super_format >= 0) {
2573                 err = super_types[super_format].
2574                         load_super(rdev, NULL, super_minor);
2575                 if (err == -EINVAL) {
2576                         printk(KERN_WARNING
2577                                 "md: %s does not have a valid v%d.%d "
2578                                "superblock, not importing!\n",
2579                                 bdevname(rdev->bdev,b),
2580                                super_format, super_minor);
2581                         goto abort_free;
2582                 }
2583                 if (err < 0) {
2584                         printk(KERN_WARNING
2585                                 "md: could not read %s's sb, not importing!\n",
2586                                 bdevname(rdev->bdev,b));
2587                         goto abort_free;
2588                 }
2589         }
2590
2591         INIT_LIST_HEAD(&rdev->same_set);
2592         init_waitqueue_head(&rdev->blocked_wait);
2593
2594         return rdev;
2595
2596 abort_free:
2597         if (rdev->sb_page) {
2598                 if (rdev->bdev)
2599                         unlock_rdev(rdev);
2600                 free_disk_sb(rdev);
2601         }
2602         kfree(rdev);
2603         return ERR_PTR(err);
2604 }
2605
2606 /*
2607  * Check a full RAID array for plausibility
2608  */
2609
2610
2611 static void analyze_sbs(mddev_t * mddev)
2612 {
2613         int i;
2614         mdk_rdev_t *rdev, *freshest, *tmp;
2615         char b[BDEVNAME_SIZE];
2616
2617         freshest = NULL;
2618         rdev_for_each(rdev, tmp, mddev)
2619                 switch (super_types[mddev->major_version].
2620                         load_super(rdev, freshest, mddev->minor_version)) {
2621                 case 1:
2622                         freshest = rdev;
2623                         break;
2624                 case 0:
2625                         break;
2626                 default:
2627                         printk( KERN_ERR \
2628                                 "md: fatal superblock inconsistency in %s"
2629                                 " -- removing from array\n",
2630                                 bdevname(rdev->bdev,b));
2631                         kick_rdev_from_array(rdev);
2632                 }
2633
2634
2635         super_types[mddev->major_version].
2636                 validate_super(mddev, freshest);
2637
2638         i = 0;
2639         rdev_for_each(rdev, tmp, mddev) {
2640                 if (rdev->desc_nr >= mddev->max_disks ||
2641                     i > mddev->max_disks) {
2642                         printk(KERN_WARNING
2643                                "md: %s: %s: only %d devices permitted\n",
2644                                mdname(mddev), bdevname(rdev->bdev, b),
2645                                mddev->max_disks);
2646                         kick_rdev_from_array(rdev);
2647                         continue;
2648                 }
2649                 if (rdev != freshest)
2650                         if (super_types[mddev->major_version].
2651                             validate_super(mddev, rdev)) {
2652                                 printk(KERN_WARNING "md: kicking non-fresh %s"
2653                                         " from array!\n",
2654                                         bdevname(rdev->bdev,b));
2655                                 kick_rdev_from_array(rdev);
2656                                 continue;
2657                         }
2658                 if (mddev->level == LEVEL_MULTIPATH) {
2659                         rdev->desc_nr = i++;
2660                         rdev->raid_disk = rdev->desc_nr;
2661                         set_bit(In_sync, &rdev->flags);
2662                 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2663                         rdev->raid_disk = -1;
2664                         clear_bit(In_sync, &rdev->flags);
2665                 }
2666         }
2667 }
2668
2669 static void md_safemode_timeout(unsigned long data);
2670
2671 static ssize_t
2672 safe_delay_show(mddev_t *mddev, char *page)
2673 {
2674         int msec = (mddev->safemode_delay*1000)/HZ;
2675         return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2676 }
2677 static ssize_t
2678 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2679 {
2680         int scale=1;
2681         int dot=0;
2682         int i;
2683         unsigned long msec;
2684         char buf[30];
2685
2686         /* remove a period, and count digits after it */
2687         if (len >= sizeof(buf))
2688                 return -EINVAL;
2689         strlcpy(buf, cbuf, sizeof(buf));
2690         for (i=0; i<len; i++) {
2691                 if (dot) {
2692                         if (isdigit(buf[i])) {
2693                                 buf[i-1] = buf[i];
2694                                 scale *= 10;
2695                         }
2696                         buf[i] = 0;
2697                 } else if (buf[i] == '.') {
2698                         dot=1;
2699                         buf[i] = 0;
2700                 }
2701         }
2702         if (strict_strtoul(buf, 10, &msec) < 0)
2703                 return -EINVAL;
2704         msec = (msec * 1000) / scale;
2705         if (msec == 0)
2706                 mddev->safemode_delay = 0;
2707         else {
2708                 unsigned long old_delay = mddev->safemode_delay;
2709                 mddev->safemode_delay = (msec*HZ)/1000;
2710                 if (mddev->safemode_delay == 0)
2711                         mddev->safemode_delay = 1;
2712                 if (mddev->safemode_delay < old_delay)
2713                         md_safemode_timeout((unsigned long)mddev);
2714         }
2715         return len;
2716 }
2717 static struct md_sysfs_entry md_safe_delay =
2718 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2719
2720 static ssize_t
2721 level_show(mddev_t *mddev, char *page)
2722 {
2723         struct mdk_personality *p = mddev->pers;
2724         if (p)
2725                 return sprintf(page, "%s\n", p->name);
2726         else if (mddev->clevel[0])
2727                 return sprintf(page, "%s\n", mddev->clevel);
2728         else if (mddev->level != LEVEL_NONE)
2729                 return sprintf(page, "%d\n", mddev->level);
2730         else
2731                 return 0;
2732 }
2733
2734 static ssize_t
2735 level_store(mddev_t *mddev, const char *buf, size_t len)
2736 {
2737         char level[16];
2738         ssize_t rv = len;
2739         struct mdk_personality *pers;
2740         void *priv;
2741         mdk_rdev_t *rdev;
2742
2743         if (mddev->pers == NULL) {
2744                 if (len == 0)
2745                         return 0;
2746                 if (len >= sizeof(mddev->clevel))
2747                         return -ENOSPC;
2748                 strncpy(mddev->clevel, buf, len);
2749                 if (mddev->clevel[len-1] == '\n')
2750                         len--;
2751                 mddev->clevel[len] = 0;
2752                 mddev->level = LEVEL_NONE;
2753                 return rv;
2754         }
2755
2756         /* request to change the personality.  Need to ensure:
2757          *  - array is not engaged in resync/recovery/reshape
2758          *  - old personality can be suspended
2759          *  - new personality will access other array.
2760          */
2761
2762         if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2763                 return -EBUSY;
2764
2765         if (!mddev->pers->quiesce) {
2766                 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2767                        mdname(mddev), mddev->pers->name);
2768                 return -EINVAL;
2769         }
2770
2771         /* Now find the new personality */
2772         if (len == 0 || len >= sizeof(level))
2773                 return -EINVAL;
2774         strncpy(level, buf, len);
2775         if (level[len-1] == '\n')
2776                 len--;
2777         level[len] = 0;
2778
2779         request_module("md-%s", level);
2780         spin_lock(&pers_lock);
2781         pers = find_pers(LEVEL_NONE, level);
2782         if (!pers || !try_module_get(pers->owner)) {
2783                 spin_unlock(&pers_lock);
2784                 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2785                 return -EINVAL;
2786         }
2787         spin_unlock(&pers_lock);
2788
2789         if (pers == mddev->pers) {
2790                 /* Nothing to do! */
2791                 module_put(pers->owner);
2792                 return rv;
2793         }
2794         if (!pers->takeover) {
2795                 module_put(pers->owner);
2796                 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2797                        mdname(mddev), level);
2798                 return -EINVAL;
2799         }
2800
2801         /* ->takeover must set new_* and/or delta_disks
2802          * if it succeeds, and may set them when it fails.
2803          */
2804         priv = pers->takeover(mddev);
2805         if (IS_ERR(priv)) {
2806                 mddev->new_level = mddev->level;
2807                 mddev->new_layout = mddev->layout;
2808                 mddev->new_chunk_sectors = mddev->chunk_sectors;
2809                 mddev->raid_disks -= mddev->delta_disks;
2810                 mddev->delta_disks = 0;
2811                 module_put(pers->owner);
2812                 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2813                        mdname(mddev), level);
2814                 return PTR_ERR(priv);
2815         }
2816
2817         /* Looks like we have a winner */
2818         mddev_suspend(mddev);
2819         mddev->pers->stop(mddev);
2820         module_put(mddev->pers->owner);
2821         /* Invalidate devices that are now superfluous */
2822         list_for_each_entry(rdev, &mddev->disks, same_set)
2823                 if (rdev->raid_disk >= mddev->raid_disks) {
2824                         rdev->raid_disk = -1;
2825                         clear_bit(In_sync, &rdev->flags);
2826                 }
2827         mddev->pers = pers;
2828         mddev->private = priv;
2829         strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2830         mddev->level = mddev->new_level;
2831         mddev->layout = mddev->new_layout;
2832         mddev->chunk_sectors = mddev->new_chunk_sectors;
2833         mddev->delta_disks = 0;
2834         pers->run(mddev);
2835         mddev_resume(mddev);
2836         set_bit(MD_CHANGE_DEVS, &mddev->flags);
2837         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2838         md_wakeup_thread(mddev->thread);
2839         return rv;
2840 }
2841
2842 static struct md_sysfs_entry md_level =
2843 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2844
2845
2846 static ssize_t
2847 layout_show(mddev_t *mddev, char *page)
2848 {
2849         /* just a number, not meaningful for all levels */
2850         if (mddev->reshape_position != MaxSector &&
2851             mddev->layout != mddev->new_layout)
2852                 return sprintf(page, "%d (%d)\n",
2853                                mddev->new_layout, mddev->layout);
2854         return sprintf(page, "%d\n", mddev->layout);
2855 }
2856
2857 static ssize_t
2858 layout_store(mddev_t *mddev, const char *buf, size_t len)
2859 {
2860         char *e;
2861         unsigned long n = simple_strtoul(buf, &e, 10);
2862
2863         if (!*buf || (*e && *e != '\n'))
2864                 return -EINVAL;
2865
2866         if (mddev->pers) {
2867                 int err;
2868                 if (mddev->pers->check_reshape == NULL)
2869                         return -EBUSY;
2870                 mddev->new_layout = n;
2871                 err = mddev->pers->check_reshape(mddev);
2872                 if (err) {
2873                         mddev->new_layout = mddev->layout;
2874                         return err;
2875                 }
2876         } else {
2877                 mddev->new_layout = n;
2878                 if (mddev->reshape_position == MaxSector)
2879                         mddev->layout = n;
2880         }
2881         return len;
2882 }
2883 static struct md_sysfs_entry md_layout =
2884 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2885
2886
2887 static ssize_t
2888 raid_disks_show(mddev_t *mddev, char *page)
2889 {
2890         if (mddev->raid_disks == 0)
2891                 return 0;
2892         if (mddev->reshape_position != MaxSector &&
2893             mddev->delta_disks != 0)
2894                 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2895                                mddev->raid_disks - mddev->delta_disks);
2896         return sprintf(page, "%d\n", mddev->raid_disks);
2897 }
2898
2899 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2900
2901 static ssize_t
2902 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2903 {
2904         char *e;
2905         int rv = 0;
2906         unsigned long n = simple_strtoul(buf, &e, 10);
2907
2908         if (!*buf || (*e && *e != '\n'))
2909                 return -EINVAL;
2910
2911         if (mddev->pers)
2912                 rv = update_raid_disks(mddev, n);
2913         else if (mddev->reshape_position != MaxSector) {
2914                 int olddisks = mddev->raid_disks - mddev->delta_disks;
2915                 mddev->delta_disks = n - olddisks;
2916                 mddev->raid_disks = n;
2917         } else
2918                 mddev->raid_disks = n;
2919         return rv ? rv : len;
2920 }
2921 static struct md_sysfs_entry md_raid_disks =
2922 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2923
2924 static ssize_t
2925 chunk_size_show(mddev_t *mddev, char *page)
2926 {
2927         if (mddev->reshape_position != MaxSector &&
2928             mddev->chunk_sectors != mddev->new_chunk_sectors)
2929                 return sprintf(page, "%d (%d)\n",
2930                                mddev->new_chunk_sectors << 9,
2931                                mddev->chunk_sectors << 9);
2932         return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
2933 }
2934
2935 static ssize_t
2936 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2937 {
2938         char *e;
2939         unsigned long n = simple_strtoul(buf, &e, 10);
2940
2941         if (!*buf || (*e && *e != '\n'))
2942                 return -EINVAL;
2943
2944         if (mddev->pers) {
2945                 int err;
2946                 if (mddev->pers->check_reshape == NULL)
2947                         return -EBUSY;
2948                 mddev->new_chunk_sectors = n >> 9;
2949                 err = mddev->pers->check_reshape(mddev);
2950                 if (err) {
2951                         mddev->new_chunk_sectors = mddev->chunk_sectors;
2952                         return err;
2953                 }
2954         } else {
2955                 mddev->new_chunk_sectors = n >> 9;
2956                 if (mddev->reshape_position == MaxSector)
2957                         mddev->chunk_sectors = n >> 9;
2958         }
2959         return len;
2960 }
2961 static struct md_sysfs_entry md_chunk_size =
2962 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2963
2964 static ssize_t
2965 resync_start_show(mddev_t *mddev, char *page)
2966 {
2967         if (mddev->recovery_cp == MaxSector)
2968                 return sprintf(page, "none\n");
2969         return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2970 }
2971
2972 static ssize_t
2973 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2974 {
2975         char *e;
2976         unsigned long long n = simple_strtoull(buf, &e, 10);
2977
2978         if (mddev->pers)
2979                 return -EBUSY;
2980         if (!*buf || (*e && *e != '\n'))
2981                 return -EINVAL;
2982
2983         mddev->recovery_cp = n;
2984         return len;
2985 }
2986 static struct md_sysfs_entry md_resync_start =
2987 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2988
2989 /*
2990  * The array state can be:
2991  *
2992  * clear
2993  *     No devices, no size, no level
2994  *     Equivalent to STOP_ARRAY ioctl
2995  * inactive
2996  *     May have some settings, but array is not active
2997  *        all IO results in error
2998  *     When written, doesn't tear down array, but just stops it
2999  * suspended (not supported yet)
3000  *     All IO requests will block. The array can be reconfigured.
3001  *     Writing this, if accepted, will block until array is quiescent
3002  * readonly
3003  *     no resync can happen.  no superblocks get written.
3004  *     write requests fail
3005  * read-auto
3006  *     like readonly, but behaves like 'clean' on a write request.
3007  *
3008  * clean - no pending writes, but otherwise active.
3009  *     When written to inactive array, starts without resync
3010  *     If a write request arrives then
3011  *       if metadata is known, mark 'dirty' and switch to 'active'.
3012  *       if not known, block and switch to write-pending
3013  *     If written to an active array that has pending writes, then fails.
3014  * active
3015  *     fully active: IO and resync can be happening.
3016  *     When written to inactive array, starts with resync
3017  *
3018  * write-pending
3019  *     clean, but writes are blocked waiting for 'active' to be written.
3020  *
3021  * active-idle
3022  *     like active, but no writes have been seen for a while (100msec).
3023  *
3024  */
3025 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3026                    write_pending, active_idle, bad_word};
3027 static char *array_states[] = {
3028         "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3029         "write-pending", "active-idle", NULL };
3030
3031 static int match_word(const char *word, char **list)
3032 {
3033         int n;
3034         for (n=0; list[n]; n++)
3035                 if (cmd_match(word, list[n]))
3036                         break;
3037         return n;
3038 }
3039
3040 static ssize_t
3041 array_state_show(mddev_t *mddev, char *page)
3042 {
3043         enum array_state st = inactive;
3044
3045         if (mddev->pers)
3046                 switch(mddev->ro) {
3047                 case 1:
3048                         st = readonly;
3049                         break;
3050                 case 2:
3051                         st = read_auto;
3052                         break;
3053                 case 0:
3054                         if (mddev->in_sync)
3055                                 st = clean;
3056                         else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3057                                 st = write_pending;
3058                         else if (mddev->safemode)
3059                                 st = active_idle;
3060                         else
3061                                 st = active;
3062                 }
3063         else {
3064                 if (list_empty(&mddev->disks) &&
3065                     mddev->raid_disks == 0 &&
3066                     mddev->dev_sectors == 0)
3067                         st = clear;
3068                 else
3069                         st = inactive;
3070         }
3071         return sprintf(page, "%s\n", array_states[st]);
3072 }
3073
3074 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3075 static int do_md_run(mddev_t * mddev);
3076 static int restart_array(mddev_t *mddev);
3077
3078 static ssize_t
3079 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3080 {
3081         int err = -EINVAL;
3082         enum array_state st = match_word(buf, array_states);
3083         switch(st) {
3084         case bad_word:
3085                 break;
3086         case clear:
3087                 /* stopping an active array */
3088                 if (atomic_read(&mddev->openers) > 0)
3089                         return -EBUSY;
3090                 err = do_md_stop(mddev, 0, 0);
3091                 break;
3092         case inactive:
3093                 /* stopping an active array */
3094                 if (mddev->pers) {
3095                         if (atomic_read(&mddev->openers) > 0)
3096                                 return -EBUSY;
3097                         err = do_md_stop(mddev, 2, 0);
3098                 } else
3099                         err = 0; /* already inactive */
3100                 break;
3101         case suspended:
3102                 break; /* not supported yet */
3103         case readonly:
3104                 if (mddev->pers)
3105                         err = do_md_stop(mddev, 1, 0);
3106                 else {
3107                         mddev->ro = 1;
3108                         set_disk_ro(mddev->gendisk, 1);
3109                         err = do_md_run(mddev);
3110                 }
3111                 break;
3112         case read_auto:
3113                 if (mddev->pers) {
3114                         if (mddev->ro == 0)
3115                                 err = do_md_stop(mddev, 1, 0);
3116                         else if (mddev->ro == 1)
3117                                 err = restart_array(mddev);
3118                         if (err == 0) {
3119                                 mddev->ro = 2;
3120                                 set_disk_ro(mddev->gendisk, 0);
3121                         }
3122                 } else {
3123                         mddev->ro = 2;
3124                         err = do_md_run(mddev);
3125                 }
3126                 break;
3127         case clean:
3128                 if (mddev->pers) {
3129                         restart_array(mddev);
3130                         spin_lock_irq(&mddev->write_lock);
3131                         if (atomic_read(&mddev->writes_pending) == 0) {
3132                                 if (mddev->in_sync == 0) {
3133                                         mddev->in_sync = 1;
3134                                         if (mddev->safemode == 1)
3135                                                 mddev->safemode = 0;
3136                                         if (mddev->persistent)
3137                                                 set_bit(MD_CHANGE_CLEAN,
3138                                                         &mddev->flags);
3139                                 }
3140                                 err = 0;
3141                         } else
3142                                 err = -EBUSY;
3143                         spin_unlock_irq(&mddev->write_lock);
3144                 } else
3145                         err = -EINVAL;
3146                 break;
3147         case active:
3148                 if (mddev->pers) {
3149                         restart_array(mddev);
3150                         if (mddev->external)
3151                                 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3152                         wake_up(&mddev->sb_wait);
3153                         err = 0;
3154                 } else {
3155                         mddev->ro = 0;
3156                         set_disk_ro(mddev->gendisk, 0);
3157                         err = do_md_run(mddev);
3158                 }
3159                 break;
3160         case write_pending:
3161         case active_idle:
3162                 /* these cannot be set */
3163                 break;
3164         }
3165         if (err)
3166                 return err;
3167         else {
3168                 sysfs_notify_dirent(mddev->sysfs_state);
3169                 return len;
3170         }
3171 }
3172 static struct md_sysfs_entry md_array_state =
3173 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3174
3175 static ssize_t
3176 null_show(mddev_t *mddev, char *page)
3177 {
3178         return -EINVAL;
3179 }
3180
3181 static ssize_t
3182 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3183 {
3184         /* buf must be %d:%d\n? giving major and minor numbers */
3185         /* The new device is added to the array.
3186          * If the array has a persistent superblock, we read the
3187          * superblock to initialise info and check validity.
3188          * Otherwise, only checking done is that in bind_rdev_to_array,
3189          * which mainly checks size.
3190          */
3191         char *e;
3192         int major = simple_strtoul(buf, &e, 10);
3193         int minor;
3194         dev_t dev;
3195         mdk_rdev_t *rdev;
3196         int err;
3197
3198         if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3199                 return -EINVAL;
3200         minor = simple_strtoul(e+1, &e, 10);
3201         if (*e && *e != '\n')
3202                 return -EINVAL;
3203         dev = MKDEV(major, minor);
3204         if (major != MAJOR(dev) ||
3205             minor != MINOR(dev))
3206                 return -EOVERFLOW;
3207
3208
3209         if (mddev->persistent) {
3210                 rdev = md_import_device(dev, mddev->major_version,
3211                                         mddev->minor_version);
3212                 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3213                         mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3214                                                        mdk_rdev_t, same_set);
3215                         err = super_types[mddev->major_version]
3216                                 .load_super(rdev, rdev0, mddev->minor_version);
3217                         if (err < 0)
3218                                 goto out;
3219                 }
3220         } else if (mddev->external)
3221                 rdev = md_import_device(dev, -2, -1);
3222         else
3223                 rdev = md_import_device(dev, -1, -1);
3224
3225         if (IS_ERR(rdev))
3226                 return PTR_ERR(rdev);
3227         err = bind_rdev_to_array(rdev, mddev);
3228  out:
3229         if (err)
3230                 export_rdev(rdev);
3231         return err ? err : len;
3232 }
3233
3234 static struct md_sysfs_entry md_new_device =
3235 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3236
3237 static ssize_t
3238 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3239 {
3240         char *end;
3241         unsigned long chunk, end_chunk;
3242
3243         if (!mddev->bitmap)
3244                 goto out;
3245         /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3246         while (*buf) {
3247                 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3248                 if (buf == end) break;
3249                 if (*end == '-') { /* range */
3250                         buf = end + 1;
3251                         end_chunk = simple_strtoul(buf, &end, 0);
3252                         if (buf == end) break;
3253                 }
3254                 if (*end && !isspace(*end)) break;
3255                 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3256                 buf = end;
3257                 while (isspace(*buf)) buf++;
3258         }
3259         bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3260 out:
3261         return len;
3262 }
3263
3264 static struct md_sysfs_entry md_bitmap =
3265 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3266
3267 static ssize_t
3268 size_show(mddev_t *mddev, char *page)
3269 {
3270         return sprintf(page, "%llu\n",
3271                 (unsigned long long)mddev->dev_sectors / 2);
3272 }
3273
3274 static int update_size(mddev_t *mddev, sector_t num_sectors);
3275
3276 static ssize_t
3277 size_store(mddev_t *mddev, const char *buf, size_t len)
3278 {
3279         /* If array is inactive, we can reduce the component size, but
3280          * not increase it (except from 0).
3281          * If array is active, we can try an on-line resize
3282          */
3283         sector_t sectors;
3284         int err = strict_blocks_to_sectors(buf, &sectors);
3285
3286         if (err < 0)
3287                 return err;
3288         if (mddev->pers) {
3289                 err = update_size(mddev, sectors);
3290                 md_update_sb(mddev, 1);
3291         } else {
3292                 if (mddev->dev_sectors == 0 ||
3293                     mddev->dev_sectors > sectors)
3294                         mddev->dev_sectors = sectors;
3295                 else
3296                         err = -ENOSPC;
3297         }
3298         return err ? err : len;
3299 }
3300
3301 static struct md_sysfs_entry md_size =
3302 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3303
3304
3305 /* Metdata version.
3306  * This is one of
3307  *   'none' for arrays with no metadata (good luck...)
3308  *   'external' for arrays with externally managed metadata,
3309  * or N.M for internally known formats
3310  */
3311 static ssize_t
3312 metadata_show(mddev_t *mddev, char *page)
3313 {
3314         if (mddev->persistent)
3315                 return sprintf(page, "%d.%d\n",
3316                                mddev->major_version, mddev->minor_version);
3317         else if (mddev->external)
3318                 return sprintf(page, "external:%s\n", mddev->metadata_type);
3319         else
3320                 return sprintf(page, "none\n");
3321 }
3322
3323 static ssize_t
3324 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3325 {
3326         int major, minor;
3327         char *e;
3328         /* Changing the details of 'external' metadata is
3329          * always permitted.  Otherwise there must be
3330          * no devices attached to the array.
3331          */
3332         if (mddev->external && strncmp(buf, "external:", 9) == 0)
3333                 ;
3334         else if (!list_empty(&mddev->disks))
3335                 return -EBUSY;
3336
3337         if (cmd_match(buf, "none")) {
3338                 mddev->persistent = 0;
3339                 mddev->external = 0;
3340                 mddev->major_version = 0;
3341                 mddev->minor_version = 90;
3342                 return len;
3343         }
3344         if (strncmp(buf, "external:", 9) == 0) {
3345                 size_t namelen = len-9;
3346                 if (namelen >= sizeof(mddev->metadata_type))
3347                         namelen = sizeof(mddev->metadata_type)-1;
3348                 strncpy(mddev->metadata_type, buf+9, namelen);
3349                 mddev->metadata_type[namelen] = 0;
3350                 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3351                         mddev->metadata_type[--namelen] = 0;
3352                 mddev->persistent = 0;
3353                 mddev->external = 1;
3354                 mddev->major_version = 0;
3355                 mddev->minor_version = 90;
3356                 return len;
3357         }
3358         major = simple_strtoul(buf, &e, 10);
3359         if (e==buf || *e != '.')
3360                 return -EINVAL;
3361         buf = e+1;
3362         minor = simple_strtoul(buf, &e, 10);
3363         if (e==buf || (*e && *e != '\n') )
3364                 return -EINVAL;
3365         if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3366                 return -ENOENT;
3367         mddev->major_version = major;
3368         mddev->minor_version = minor;
3369         mddev->persistent = 1;
3370         mddev->external = 0;
3371         return len;
3372 }
3373
3374 static struct md_sysfs_entry md_metadata =
3375 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3376
3377 static ssize_t
3378 action_show(mddev_t *mddev, char *page)
3379 {
3380         char *type = "idle";
3381         if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3382                 type = "frozen";
3383         else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3384             (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3385                 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3386                         type = "reshape";
3387                 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3388                         if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3389                                 type = "resync";
3390                         else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3391                                 type = "check";
3392                         else
3393                                 type = "repair";
3394                 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3395                         type = "recover";
3396         }
3397         return sprintf(page, "%s\n", type);
3398 }
3399
3400 static ssize_t
3401 action_store(mddev_t *mddev, const char *page, size_t len)
3402 {
3403         if (!mddev->pers || !mddev->pers->sync_request)
3404                 return -EINVAL;
3405
3406         if (cmd_match(page, "frozen"))
3407                 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3408         else
3409                 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3410
3411         if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3412                 if (mddev->sync_thread) {
3413                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3414                         md_unregister_thread(mddev->sync_thread);
3415                         mddev->sync_thread = NULL;
3416                         mddev->recovery = 0;
3417                 }
3418         } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3419                    test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3420                 return -EBUSY;
3421         else if (cmd_match(page, "resync"))
3422                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3423         else if (cmd_match(page, "recover")) {
3424                 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3425                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3426         } else if (cmd_match(page, "reshape")) {
3427                 int err;
3428                 if (mddev->pers->start_reshape == NULL)
3429                         return -EINVAL;
3430                 err = mddev->pers->start_reshape(mddev);
3431                 if (err)
3432                         return err;
3433                 sysfs_notify(&mddev->kobj, NULL, "degraded");
3434         } else {
3435                 if (cmd_match(page, "check"))
3436                         set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3437                 else if (!cmd_match(page, "repair"))
3438                         return -EINVAL;
3439                 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3440                 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3441         }
3442         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3443         md_wakeup_thread(mddev->thread);
3444         sysfs_notify_dirent(mddev->sysfs_action);
3445         return len;
3446 }
3447
3448 static ssize_t
3449 mismatch_cnt_show(mddev_t *mddev, char *page)
3450 {
3451         return sprintf(page, "%llu\n",
3452                        (unsigned long long) mddev->resync_mismatches);
3453 }
3454
3455 static struct md_sysfs_entry md_scan_mode =
3456 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3457
3458
3459 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3460
3461 static ssize_t
3462 sync_min_show(mddev_t *mddev, char *page)
3463 {
3464         return sprintf(page, "%d (%s)\n", speed_min(mddev),
3465                        mddev->sync_speed_min ? "local": "system");
3466 }
3467
3468 static ssize_t
3469 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3470 {
3471         int min;
3472         char *e;
3473         if (strncmp(buf, "system", 6)==0) {
3474                 mddev->sync_speed_min = 0;
3475                 return len;
3476         }
3477         min = simple_strtoul(buf, &e, 10);
3478         if (buf == e || (*e && *e != '\n') || min <= 0)
3479                 return -EINVAL;
3480         mddev->sync_speed_min = min;
3481         return len;
3482 }
3483
3484 static struct md_sysfs_entry md_sync_min =
3485 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3486
3487 static ssize_t
3488 sync_max_show(mddev_t *mddev, char *page)
3489 {
3490         return sprintf(page, "%d (%s)\n", speed_max(mddev),
3491                        mddev->sync_speed_max ? "local": "system");
3492 }
3493
3494 static ssize_t
3495 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3496 {
3497         int max;
3498         char *e;
3499         if (strncmp(buf, "system", 6)==0) {
3500                 mddev->sync_speed_max = 0;
3501                 return len;
3502         }
3503         max = simple_strtoul(buf, &e, 10);
3504         if (buf == e || (*e && *e != '\n') || max <= 0)
3505                 return -EINVAL;
3506         mddev->sync_speed_max = max;
3507         return len;
3508 }
3509
3510 static struct md_sysfs_entry md_sync_max =
3511 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3512
3513 static ssize_t
3514 degraded_show(mddev_t *mddev, char *page)
3515 {
3516         return sprintf(page, "%d\n", mddev->degraded);
3517 }
3518 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3519
3520 static ssize_t
3521 sync_force_parallel_show(mddev_t *mddev, char *page)
3522 {
3523         return sprintf(page, "%d\n", mddev->parallel_resync);
3524 }
3525
3526 static ssize_t
3527 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3528 {
3529         long n;
3530
3531         if (strict_strtol(buf, 10, &n))
3532                 return -EINVAL;
3533
3534         if (n != 0 && n != 1)
3535                 return -EINVAL;
3536
3537         mddev->parallel_resync = n;
3538
3539         if (mddev->sync_thread)
3540                 wake_up(&resync_wait);
3541
3542         return len;
3543 }
3544
3545 /* force parallel resync, even with shared block devices */
3546 static struct md_sysfs_entry md_sync_force_parallel =
3547 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3548        sync_force_parallel_show, sync_force_parallel_store);
3549
3550 static ssize_t
3551 sync_speed_show(mddev_t *mddev, char *page)
3552 {
3553         unsigned long resync, dt, db;
3554         if (mddev->curr_resync == 0)
3555                 return sprintf(page, "none\n");
3556         resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3557         dt = (jiffies - mddev->resync_mark) / HZ;
3558         if (!dt) dt++;
3559         db = resync - mddev->resync_mark_cnt;
3560         return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3561 }
3562
3563 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3564
3565 static ssize_t
3566 sync_completed_show(mddev_t *mddev, char *page)
3567 {
3568         unsigned long max_sectors, resync;
3569
3570         if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3571                 return sprintf(page, "none\n");
3572
3573         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3574                 max_sectors = mddev->resync_max_sectors;
3575         else
3576                 max_sectors = mddev->dev_sectors;
3577
3578         resync = mddev->curr_resync_completed;
3579         return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3580 }
3581
3582 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3583
3584 static ssize_t
3585 min_sync_show(mddev_t *mddev, char *page)
3586 {
3587         return sprintf(page, "%llu\n",
3588                        (unsigned long long)mddev->resync_min);
3589 }
3590 static ssize_t
3591 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3592 {
3593         unsigned long long min;
3594         if (strict_strtoull(buf, 10, &min))
3595                 return -EINVAL;
3596         if (min > mddev->resync_max)
3597                 return -EINVAL;
3598         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3599                 return -EBUSY;
3600
3601         /* Must be a multiple of chunk_size */
3602         if (mddev->chunk_sectors) {
3603                 sector_t temp = min;
3604                 if (sector_div(temp, mddev->chunk_sectors))
3605                         return -EINVAL;
3606         }
3607         mddev->resync_min = min;
3608
3609         return len;
3610 }
3611
3612 static struct md_sysfs_entry md_min_sync =
3613 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3614
3615 static ssize_t
3616 max_sync_show(mddev_t *mddev, char *page)
3617 {
3618         if (mddev->resync_max == MaxSector)
3619                 return sprintf(page, "max\n");
3620         else
3621                 return sprintf(page, "%llu\n",
3622                                (unsigned long long)mddev->resync_max);
3623 }
3624 static ssize_t
3625 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3626 {
3627         if (strncmp(buf, "max", 3) == 0)
3628                 mddev->resync_max = MaxSector;
3629         else {
3630                 unsigned long long max;
3631                 if (strict_strtoull(buf, 10, &max))
3632                         return -EINVAL;
3633                 if (max < mddev->resync_min)
3634                         return -EINVAL;
3635                 if (max < mddev->resync_max &&
3636                     mddev->ro == 0 &&
3637                     test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3638                         return -EBUSY;
3639
3640                 /* Must be a multiple of chunk_size */
3641                 if (mddev->chunk_sectors) {
3642                         sector_t temp = max;
3643                         if (sector_div(temp, mddev->chunk_sectors))
3644                                 return -EINVAL;
3645                 }
3646                 mddev->resync_max = max;
3647         }
3648         wake_up(&mddev->recovery_wait);
3649         return len;
3650 }
3651
3652 static struct md_sysfs_entry md_max_sync =
3653 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3654
3655 static ssize_t
3656 suspend_lo_show(mddev_t *mddev, char *page)
3657 {
3658         return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3659 }
3660
3661 static ssize_t
3662 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3663 {
3664         char *e;
3665         unsigned long long new = simple_strtoull(buf, &e, 10);
3666
3667         if (mddev->pers == NULL ||
3668             mddev->pers->quiesce == NULL)
3669                 return -EINVAL;
3670         if (buf == e || (*e && *e != '\n'))
3671                 return -EINVAL;
3672         if (new >= mddev->suspend_hi ||
3673             (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3674                 mddev->suspend_lo = new;
3675                 mddev->pers->quiesce(mddev, 2);
3676                 return len;
3677         } else
3678                 return -EINVAL;
3679 }
3680 static struct md_sysfs_entry md_suspend_lo =
3681 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3682
3683
3684 static ssize_t
3685 suspend_hi_show(mddev_t *mddev, char *page)
3686 {
3687         return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3688 }
3689
3690 static ssize_t
3691 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3692 {
3693         char *e;
3694         unsigned long long new = simple_strtoull(buf, &e, 10);
3695
3696         if (mddev->pers == NULL ||
3697             mddev->pers->quiesce == NULL)
3698                 return -EINVAL;
3699         if (buf == e || (*e && *e != '\n'))
3700                 return -EINVAL;
3701         if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3702             (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3703                 mddev->suspend_hi = new;
3704                 mddev->pers->quiesce(mddev, 1);
3705                 mddev->pers->quiesce(mddev, 0);
3706                 return len;
3707         } else
3708                 return -EINVAL;
3709 }
3710 static struct md_sysfs_entry md_suspend_hi =
3711 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3712
3713 static ssize_t
3714 reshape_position_show(mddev_t *mddev, char *page)
3715 {
3716         if (mddev->reshape_position != MaxSector)
3717                 return sprintf(page, "%llu\n",
3718                                (unsigned long long)mddev->reshape_position);
3719         strcpy(page, "none\n");
3720         return 5;
3721 }
3722
3723 static ssize_t
3724 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3725 {
3726         char *e;
3727         unsigned long long new = simple_strtoull(buf, &e, 10);
3728         if (mddev->pers)
3729                 return -EBUSY;
3730         if (buf == e || (*e && *e != '\n'))
3731                 return -EINVAL;
3732         mddev->reshape_position = new;
3733         mddev->delta_disks = 0;
3734         mddev->new_level = mddev->level;
3735         mddev->new_layout = mddev->layout;
3736         mddev->new_chunk_sectors = mddev->chunk_sectors;
3737         return len;
3738 }
3739
3740 static struct md_sysfs_entry md_reshape_position =
3741 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3742        reshape_position_store);
3743
3744 static ssize_t
3745 array_size_show(mddev_t *mddev, char *page)
3746 {
3747         if (mddev->external_size)
3748                 return sprintf(page, "%llu\n",
3749                                (unsigned long long)mddev->array_sectors/2);
3750         else
3751                 return sprintf(page, "default\n");
3752 }
3753
3754 static ssize_t
3755 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3756 {
3757         sector_t sectors;
3758
3759         if (strncmp(buf, "default", 7) == 0) {
3760                 if (mddev->pers)
3761                         sectors = mddev->pers->size(mddev, 0, 0);
3762                 else
3763                         sectors = mddev->array_sectors;
3764
3765                 mddev->external_size = 0;
3766         } else {
3767                 if (strict_blocks_to_sectors(buf, &sectors) < 0)
3768                         return -EINVAL;
3769                 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3770                         return -E2BIG;
3771
3772                 mddev->external_size = 1;
3773         }
3774
3775         mddev->array_sectors = sectors;
3776         set_capacity(mddev->gendisk, mddev->array_sectors);
3777         if (mddev->pers)
3778                 revalidate_disk(mddev->gendisk);
3779
3780         return len;
3781 }
3782
3783 static struct md_sysfs_entry md_array_size =
3784 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3785        array_size_store);
3786
3787 static struct attribute *md_default_attrs[] = {
3788         &md_level.attr,
3789         &md_layout.attr,
3790         &md_raid_disks.attr,
3791         &md_chunk_size.attr,
3792         &md_size.attr,
3793         &md_resync_start.attr,
3794         &md_metadata.attr,
3795         &md_new_device.attr,
3796         &md_safe_delay.attr,
3797         &md_array_state.attr,
3798         &md_reshape_position.attr,
3799         &md_array_size.attr,
3800         NULL,
3801 };
3802
3803 static struct attribute *md_redundancy_attrs[] = {
3804         &md_scan_mode.attr,
3805         &md_mismatches.attr,
3806         &md_sync_min.attr,
3807         &md_sync_max.attr,
3808         &md_sync_speed.attr,
3809         &md_sync_force_parallel.attr,
3810         &md_sync_completed.attr,
3811         &md_min_sync.attr,
3812         &md_max_sync.attr,
3813         &md_suspend_lo.attr,
3814         &md_suspend_hi.attr,
3815         &md_bitmap.attr,
3816         &md_degraded.attr,
3817         NULL,
3818 };
3819 static struct attribute_group md_redundancy_group = {
3820         .name = NULL,
3821         .attrs = md_redundancy_attrs,
3822 };
3823
3824
3825 static ssize_t
3826 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3827 {
3828         struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3829         mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3830         ssize_t rv;
3831
3832         if (!entry->show)
3833                 return -EIO;
3834         rv = mddev_lock(mddev);
3835         if (!rv) {
3836                 rv = entry->show(mddev, page);
3837                 mddev_unlock(mddev);
3838         }
3839         return rv;
3840 }
3841
3842 static ssize_t
3843 md_attr_store(struct kobject *kobj, struct attribute *attr,
3844               const char *page, size_t length)
3845 {
3846         struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3847         mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3848         ssize_t rv;
3849
3850         if (!entry->store)
3851                 return -EIO;
3852         if (!capable(CAP_SYS_ADMIN))
3853                 return -EACCES;
3854         rv = mddev_lock(mddev);
3855         if (mddev->hold_active == UNTIL_IOCTL)
3856                 mddev->hold_active = 0;
3857         if (!rv) {
3858                 rv = entry->store(mddev, page, length);
3859                 mddev_unlock(mddev);
3860         }
3861         return rv;
3862 }
3863
3864 static void md_free(struct kobject *ko)
3865 {
3866         mddev_t *mddev = container_of(ko, mddev_t, kobj);
3867
3868         if (mddev->sysfs_state)
3869                 sysfs_put(mddev->sysfs_state);
3870
3871         if (mddev->gendisk) {
3872                 del_gendisk(mddev->gendisk);
3873                 put_disk(mddev->gendisk);
3874         }
3875         if (mddev->queue)
3876                 blk_cleanup_queue(mddev->queue);
3877
3878         kfree(mddev);
3879 }
3880
3881 static struct sysfs_ops md_sysfs_ops = {
3882         .show   = md_attr_show,
3883         .store  = md_attr_store,
3884 };
3885 static struct kobj_type md_ktype = {
3886         .release        = md_free,
3887         .sysfs_ops      = &md_sysfs_ops,
3888         .default_attrs  = md_default_attrs,
3889 };
3890
3891 int mdp_major = 0;
3892
3893 static void mddev_delayed_delete(struct work_struct *ws)
3894 {
3895         mddev_t *mddev = container_of(ws, mddev_t, del_work);
3896
3897         if (mddev->private == &md_redundancy_group) {
3898                 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3899                 if (mddev->sysfs_action)
3900                         sysfs_put(mddev->sysfs_action);
3901                 mddev->sysfs_action = NULL;
3902                 mddev->private = NULL;
3903         }
3904         kobject_del(&mddev->kobj);
3905         kobject_put(&mddev->kobj);
3906 }
3907
3908 static int md_alloc(dev_t dev, char *name)
3909 {
3910         static DEFINE_MUTEX(disks_mutex);
3911         mddev_t *mddev = mddev_find(dev);
3912         struct gendisk *disk;
3913         int partitioned;
3914         int shift;
3915         int unit;
3916         int error;
3917
3918         if (!mddev)
3919                 return -ENODEV;
3920
3921         partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3922         shift = partitioned ? MdpMinorShift : 0;
3923         unit = MINOR(mddev->unit) >> shift;
3924
3925         /* wait for any previous instance if this device
3926          * to be completed removed (mddev_delayed_delete).
3927          */
3928         flush_scheduled_work();
3929
3930         mutex_lock(&disks_mutex);
3931         error = -EEXIST;
3932         if (mddev->gendisk)
3933                 goto abort;
3934
3935         if (name) {
3936                 /* Need to ensure that 'name' is not a duplicate.
3937                  */
3938                 mddev_t *mddev2;
3939                 spin_lock(&all_mddevs_lock);
3940
3941                 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3942                         if (mddev2->gendisk &&
3943                             strcmp(mddev2->gendisk->disk_name, name) == 0) {
3944                                 spin_unlock(&all_mddevs_lock);
3945                                 goto abort;
3946                         }
3947                 spin_unlock(&all_mddevs_lock);
3948         }
3949
3950         error = -ENOMEM;
3951         mddev->queue = blk_alloc_queue(GFP_KERNEL);
3952         if (!mddev->queue)
3953                 goto abort;
3954         mddev->queue->queuedata = mddev;
3955
3956         /* Can be unlocked because the queue is new: no concurrency */
3957         queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3958
3959         blk_queue_make_request(mddev->queue, md_make_request);
3960
3961         disk = alloc_disk(1 << shift);
3962         if (!disk) {
3963                 blk_cleanup_queue(mddev->queue);
3964                 mddev->queue = NULL;
3965                 goto abort;
3966         }
3967         disk->major = MAJOR(mddev->unit);
3968         disk->first_minor = unit << shift;
3969         if (name)
3970                 strcpy(disk->disk_name, name);
3971         else if (partitioned)
3972                 sprintf(disk->disk_name, "md_d%d", unit);
3973         else
3974                 sprintf(disk->disk_name, "md%d", unit);
3975         disk->fops = &md_fops;
3976         disk->private_data = mddev;
3977         disk->queue = mddev->queue;
3978         /* Allow extended partitions.  This makes the
3979          * 'mdp' device redundant, but we can't really
3980          * remove it now.
3981          */
3982         disk->flags |= GENHD_FL_EXT_DEVT;
3983         add_disk(disk);
3984         mddev->gendisk = disk;
3985         error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3986                                      &disk_to_dev(disk)->kobj, "%s", "md");
3987         if (error) {
3988                 /* This isn't possible, but as kobject_init_and_add is marked
3989                  * __must_check, we must do something with the result
3990                  */
3991                 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3992                        disk->disk_name);
3993                 error = 0;
3994         }
3995  abort:
3996         mutex_unlock(&disks_mutex);
3997         if (!error) {
3998                 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3999                 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4000         }
4001         mddev_put(mddev);
4002         return error;
4003 }
4004
4005 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4006 {
4007         md_alloc(dev, NULL);
4008         return NULL;
4009 }
4010
4011 static int add_named_array(const char *val, struct kernel_param *kp)
4012 {
4013         /* val must be "md_*" where * is not all digits.
4014          * We allocate an array with a large free minor number, and
4015          * set the name to val.  val must not already be an active name.
4016          */
4017         int len = strlen(val);
4018         char buf[DISK_NAME_LEN];
4019
4020         while (len && val[len-1] == '\n')
4021                 len--;
4022         if (len >= DISK_NAME_LEN)
4023                 return -E2BIG;
4024         strlcpy(buf, val, len+1);
4025         if (strncmp(buf, "md_", 3) != 0)
4026                 return -EINVAL;
4027         return md_alloc(0, buf);
4028 }
4029
4030 static void md_safemode_timeout(unsigned long data)
4031 {
4032         mddev_t *mddev = (mddev_t *) data;
4033
4034         if (!atomic_read(&mddev->writes_pending)) {
4035                 mddev->safemode = 1;
4036                 if (mddev->external)
4037                         sysfs_notify_dirent(mddev->sysfs_state);
4038         }
4039         md_wakeup_thread(mddev->thread);
4040 }
4041
4042 static int start_dirty_degraded;
4043
4044 static int do_md_run(mddev_t * mddev)
4045 {
4046         int err;
4047         mdk_rdev_t *rdev;
4048         struct gendisk *disk;
4049         struct mdk_personality *pers;
4050
4051         if (list_empty(&mddev->disks))
4052                 /* cannot run an array with no devices.. */
4053                 return -EINVAL;
4054
4055         if (mddev->pers)
4056                 return -EBUSY;
4057
4058         /*
4059          * Analyze all RAID superblock(s)
4060          */
4061         if (!mddev->raid_disks) {
4062                 if (!mddev->persistent)
4063                         return -EINVAL;
4064                 analyze_sbs(mddev);
4065         }
4066
4067         if (mddev->level != LEVEL_NONE)
4068                 request_module("md-level-%d", mddev->level);
4069         else if (mddev->clevel[0])
4070                 request_module("md-%s", mddev->clevel);
4071
4072         /*
4073          * Drop all container device buffers, from now on
4074          * the only valid external interface is through the md
4075          * device.
4076          */
4077         list_for_each_entry(rdev, &mddev->disks, same_set) {
4078                 if (test_bit(Faulty, &rdev->flags))
4079                         continue;
4080                 sync_blockdev(rdev->bdev);
4081                 invalidate_bdev(rdev->bdev);
4082
4083                 /* perform some consistency tests on the device.
4084                  * We don't want the data to overlap the metadata,
4085                  * Internal Bitmap issues have been handled elsewhere.
4086                  */
4087                 if (rdev->data_offset < rdev->sb_start) {
4088                         if (mddev->dev_sectors &&
4089                             rdev->data_offset + mddev->dev_sectors
4090                             > rdev->sb_start) {
4091                                 printk("md: %s: data overlaps metadata\n",
4092                                        mdname(mddev));
4093                                 return -EINVAL;
4094                         }
4095                 } else {
4096                         if (rdev->sb_start + rdev->sb_size/512
4097                             > rdev->data_offset) {
4098                                 printk("md: %s: metadata overlaps data\n",
4099                                        mdname(mddev));
4100                                 return -EINVAL;
4101                         }
4102                 }
4103                 sysfs_notify_dirent(rdev->sysfs_state);
4104         }
4105
4106         md_probe(mddev->unit, NULL, NULL);
4107         disk = mddev->gendisk;
4108         if (!disk)
4109                 return -ENOMEM;
4110
4111         spin_lock(&pers_lock);
4112         pers = find_pers(mddev->level, mddev->clevel);
4113         if (!pers || !try_module_get(pers->owner)) {
4114                 spin_unlock(&pers_lock);
4115                 if (mddev->level != LEVEL_NONE)
4116                         printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4117                                mddev->level);
4118                 else
4119                         printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4120                                mddev->clevel);
4121                 return -EINVAL;
4122         }
4123         mddev->pers = pers;
4124         spin_unlock(&pers_lock);
4125         if (mddev->level != pers->level) {
4126                 mddev->level = pers->level;
4127                 mddev->new_level = pers->level;
4128         }
4129         strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4130
4131         if (mddev->reshape_position != MaxSector &&
4132             pers->start_reshape == NULL) {
4133                 /* This personality cannot handle reshaping... */
4134                 mddev->pers = NULL;
4135                 module_put(pers->owner);
4136                 return -EINVAL;
4137         }
4138
4139         if (pers->sync_request) {
4140                 /* Warn if this is a potentially silly
4141                  * configuration.
4142                  */
4143                 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4144                 mdk_rdev_t *rdev2;
4145                 int warned = 0;
4146
4147                 list_for_each_entry(rdev, &mddev->disks, same_set)
4148                         list_for_each_entry(rdev2, &mddev->disks, same_set) {
4149                                 if (rdev < rdev2 &&
4150                                     rdev->bdev->bd_contains ==
4151                                     rdev2->bdev->bd_contains) {
4152                                         printk(KERN_WARNING
4153                                                "%s: WARNING: %s appears to be"
4154                                                " on the same physical disk as"
4155                                                " %s.\n",
4156                                                mdname(mddev),
4157                                                bdevname(rdev->bdev,b),
4158                                                bdevname(rdev2->bdev,b2));
4159                                         warned = 1;
4160                                 }
4161                         }
4162
4163                 if (warned)
4164                         printk(KERN_WARNING
4165                                "True protection against single-disk"
4166                                " failure might be compromised.\n");
4167         }
4168
4169         mddev->recovery = 0;
4170         /* may be over-ridden by personality */
4171         mddev->resync_max_sectors = mddev->dev_sectors;
4172
4173         mddev->barriers_work = 1;
4174         mddev->ok_start_degraded = start_dirty_degraded;
4175
4176         if (start_readonly && mddev->ro == 0)
4177                 mddev->ro = 2; /* read-only, but switch on first write */
4178
4179         err = mddev->pers->run(mddev);
4180         if (err)
4181                 printk(KERN_ERR "md: pers->run() failed ...\n");
4182         else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4183                 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4184                           " but 'external_size' not in effect?\n", __func__);
4185                 printk(KERN_ERR
4186                        "md: invalid array_size %llu > default size %llu\n",
4187                        (unsigned long long)mddev->array_sectors / 2,
4188                        (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4189                 err = -EINVAL;
4190                 mddev->pers->stop(mddev);
4191         }
4192         if (err == 0 && mddev->pers->sync_request) {
4193                 err = bitmap_create(mddev);
4194                 if (err) {
4195                         printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4196                                mdname(mddev), err);
4197                         mddev->pers->stop(mddev);
4198                 }
4199         }
4200         if (err) {
4201                 module_put(mddev->pers->owner);
4202                 mddev->pers = NULL;
4203                 bitmap_destroy(mddev);
4204                 return err;
4205         }
4206         if (mddev->pers->sync_request) {
4207                 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4208                         printk(KERN_WARNING
4209                                "md: cannot register extra attributes for %s\n",
4210                                mdname(mddev));
4211                 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4212         } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4213                 mddev->ro = 0;
4214
4215         atomic_set(&mddev->writes_pending,0);
4216         mddev->safemode = 0;
4217         mddev->safemode_timer.function = md_safemode_timeout;
4218         mddev->safemode_timer.data = (unsigned long) mddev;
4219         mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4220         mddev->in_sync = 1;
4221
4222         list_for_each_entry(rdev, &mddev->disks, same_set)
4223                 if (rdev->raid_disk >= 0) {
4224                         char nm[20];
4225                         sprintf(nm, "rd%d", rdev->raid_disk);
4226                         if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4227                                 printk("md: cannot register %s for %s\n",
4228                                        nm, mdname(mddev));
4229                 }
4230
4231         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4232
4233         if (mddev->flags)
4234                 md_update_sb(mddev, 0);
4235
4236         set_capacity(disk, mddev->array_sectors);
4237
4238         /* If there is a partially-recovered drive we need to
4239          * start recovery here.  If we leave it to md_check_recovery,
4240          * it will remove the drives and not do the right thing
4241          */
4242         if (mddev->degraded && !mddev->sync_thread) {
4243                 int spares = 0;
4244                 list_for_each_entry(rdev, &mddev->disks, same_set)
4245                         if (rdev->raid_disk >= 0 &&
4246                             !test_bit(In_sync, &rdev->flags) &&
4247                             !test_bit(Faulty, &rdev->flags))
4248                                 /* complete an interrupted recovery */
4249                                 spares++;
4250                 if (spares && mddev->pers->sync_request) {
4251                         mddev->recovery = 0;
4252                         set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4253                         mddev->sync_thread = md_register_thread(md_do_sync,
4254                                                                 mddev,
4255                                                                 "resync");
4256                         if (!mddev->sync_thread) {
4257                                 printk(KERN_ERR "%s: could not start resync"
4258                                        " thread...\n",
4259                                        mdname(mddev));
4260                                 /* leave the spares where they are, it shouldn't hurt */
4261                                 mddev->recovery = 0;
4262                         }
4263                 }
4264         }
4265         md_wakeup_thread(mddev->thread);
4266         md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4267
4268         revalidate_disk(mddev->gendisk);
4269         mddev->changed = 1;
4270         md_new_event(mddev);
4271         sysfs_notify_dirent(mddev->sysfs_state);
4272         if (mddev->sysfs_action)
4273                 sysfs_notify_dirent(mddev->sysfs_action);
4274         sysfs_notify(&mddev->kobj, NULL, "degraded");
4275         kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4276         return 0;
4277 }
4278
4279 static int restart_array(mddev_t *mddev)
4280 {
4281         struct gendisk *disk = mddev->gendisk;
4282
4283         /* Complain if it has no devices */
4284         if (list_empty(&mddev->disks))
4285                 return -ENXIO;
4286         if (!mddev->pers)
4287                 return -EINVAL;
4288         if (!mddev->ro)
4289                 return -EBUSY;
4290         mddev->safemode = 0;
4291         mddev->ro = 0;
4292         set_disk_ro(disk, 0);
4293         printk(KERN_INFO "md: %s switched to read-write mode.\n",
4294                 mdname(mddev));
4295         /* Kick recovery or resync if necessary */
4296         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4297         md_wakeup_thread(mddev->thread);
4298         md_wakeup_thread(mddev->sync_thread);
4299         sysfs_notify_dirent(mddev->sysfs_state);
4300         return 0;
4301 }
4302
4303 /* similar to deny_write_access, but accounts for our holding a reference
4304  * to the file ourselves */
4305 static int deny_bitmap_write_access(struct file * file)
4306 {
4307         struct inode *inode = file->f_mapping->host;
4308
4309         spin_lock(&inode->i_lock);
4310         if (atomic_read(&inode->i_writecount) > 1) {
4311                 spin_unlock(&inode->i_lock);
4312                 return -ETXTBSY;
4313         }
4314         atomic_set(&inode->i_writecount, -1);
4315         spin_unlock(&inode->i_lock);
4316
4317         return 0;
4318 }
4319
4320 static void restore_bitmap_write_access(struct file *file)
4321 {
4322         struct inode *inode = file->f_mapping->host;
4323
4324         spin_lock(&inode->i_lock);
4325         atomic_set(&inode->i_writecount, 1);
4326         spin_unlock(&inode->i_lock);
4327 }
4328
4329 /* mode:
4330  *   0 - completely stop and dis-assemble array
4331  *   1 - switch to readonly
4332  *   2 - stop but do not disassemble array
4333  */
4334 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4335 {
4336         int err = 0;
4337         struct gendisk *disk = mddev->gendisk;
4338         mdk_rdev_t *rdev;
4339
4340         mutex_lock(&mddev->open_mutex);
4341         if (atomic_read(&mddev->openers) > is_open) {
4342                 printk("md: %s still in use.\n",mdname(mddev));
4343                 err = -EBUSY;
4344         } else if (mddev->pers) {
4345
4346                 if (mddev->sync_thread) {
4347                         set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4348                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4349                         md_unregister_thread(mddev->sync_thread);
4350                         mddev->sync_thread = NULL;
4351                 }
4352
4353                 del_timer_sync(&mddev->safemode_timer);
4354
4355                 switch(mode) {
4356                 case 1: /* readonly */
4357                         err  = -ENXIO;
4358                         if (mddev->ro==1)
4359                                 goto out;
4360                         mddev->ro = 1;
4361                         break;
4362                 case 0: /* disassemble */
4363                 case 2: /* stop */
4364                         bitmap_flush(mddev);
4365                         md_super_wait(mddev);
4366                         if (mddev->ro)
4367                                 set_disk_ro(disk, 0);
4368
4369                         mddev->pers->stop(mddev);
4370                         mddev->queue->merge_bvec_fn = NULL;
4371                         mddev->queue->unplug_fn = NULL;
4372                         mddev->queue->backing_dev_info.congested_fn = NULL;
4373                         module_put(mddev->pers->owner);
4374                         if (mddev->pers->sync_request)
4375                                 mddev->private = &md_redundancy_group;
4376                         mddev->pers = NULL;
4377                         /* tell userspace to handle 'inactive' */
4378                         sysfs_notify_dirent(mddev->sysfs_state);
4379
4380                         list_for_each_entry(rdev, &mddev->disks, same_set)
4381                                 if (rdev->raid_disk >= 0) {
4382                                         char nm[20];
4383                                         sprintf(nm, "rd%d", rdev->raid_disk);
4384                                         sysfs_remove_link(&mddev->kobj, nm);
4385                                 }
4386
4387                         set_capacity(disk, 0);
4388                         mddev->changed = 1;
4389
4390                         if (mddev->ro)
4391                                 mddev->ro = 0;
4392                 }
4393                 if (!mddev->in_sync || mddev->flags) {
4394                         /* mark array as shutdown cleanly */
4395                         mddev->in_sync = 1;
4396                         md_update_sb(mddev, 1);
4397                 }
4398                 if (mode == 1)
4399                         set_disk_ro(disk, 1);
4400                 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4401                 err = 0;
4402         }
4403 out:
4404         mutex_unlock(&mddev->open_mutex);
4405         if (err)
4406                 return err;
4407         /*
4408          * Free resources if final stop
4409          */
4410         if (mode == 0) {
4411
4412                 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4413
4414                 bitmap_destroy(mddev);
4415                 if (mddev->bitmap_file) {
4416                         restore_bitmap_write_access(mddev->bitmap_file);
4417                         fput(mddev->bitmap_file);
4418                         mddev->bitmap_file = NULL;
4419                 }
4420                 mddev->bitmap_offset = 0;
4421
4422                 /* make sure all md_delayed_delete calls have finished */
4423                 flush_scheduled_work();
4424
4425                 export_array(mddev);
4426
4427                 mddev->array_sectors = 0;
4428                 mddev->external_size = 0;
4429                 mddev->dev_sectors = 0;
4430                 mddev->raid_disks = 0;
4431                 mddev->recovery_cp = 0;
4432                 mddev->resync_min = 0;
4433                 mddev->resync_max = MaxSector;
4434                 mddev->reshape_position = MaxSector;
4435                 mddev->external = 0;
4436                 mddev->persistent = 0;
4437                 mddev->level = LEVEL_NONE;
4438                 mddev->clevel[0] = 0;
4439                 mddev->flags = 0;
4440                 mddev->ro = 0;
4441                 mddev->metadata_type[0] = 0;
4442                 mddev->chunk_sectors = 0;
4443                 mddev->ctime = mddev->utime = 0;
4444                 mddev->layout = 0;
4445                 mddev->max_disks = 0;
4446                 mddev->events = 0;
4447                 mddev->delta_disks = 0;
4448                 mddev->new_level = LEVEL_NONE;
4449                 mddev->new_layout = 0;
4450                 mddev->new_chunk_sectors = 0;
4451                 mddev->curr_resync = 0;
4452                 mddev->resync_mismatches = 0;
4453                 mddev->suspend_lo = mddev->suspend_hi = 0;
4454                 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4455                 mddev->recovery = 0;
4456                 mddev->in_sync = 0;
4457                 mddev->changed = 0;
4458                 mddev->degraded = 0;
4459                 mddev->barriers_work = 0;
4460                 mddev->safemode = 0;
4461                 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4462                 if (mddev->hold_active == UNTIL_STOP)
4463                         mddev->hold_active = 0;
4464
4465         } else if (mddev->pers)
4466                 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4467                         mdname(mddev));
4468         err = 0;
4469         blk_integrity_unregister(disk);
4470         md_new_event(mddev);
4471         sysfs_notify_dirent(mddev->sysfs_state);
4472         return err;
4473 }
4474
4475 #ifndef MODULE
4476 static void autorun_array(mddev_t *mddev)
4477 {
4478         mdk_rdev_t *rdev;
4479         int err;
4480
4481         if (list_empty(&mddev->disks))
4482                 return;
4483
4484         printk(KERN_INFO "md: running: ");
4485
4486         list_for_each_entry(rdev, &mddev->disks, same_set) {
4487                 char b[BDEVNAME_SIZE];
4488                 printk("<%s>", bdevname(rdev->bdev,b));
4489         }
4490         printk("\n");
4491
4492         err = do_md_run(mddev);
4493         if (err) {
4494                 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4495                 do_md_stop(mddev, 0, 0);
4496         }
4497 }
4498
4499 /*
4500  * lets try to run arrays based on all disks that have arrived
4501  * until now. (those are in pending_raid_disks)
4502  *
4503  * the method: pick the first pending disk, collect all disks with
4504  * the same UUID, remove all from the pending list and put them into
4505  * the 'same_array' list. Then order this list based on superblock
4506  * update time (freshest comes first), kick out 'old' disks and
4507  * compare superblocks. If everything's fine then run it.
4508  *
4509  * If "unit" is allocated, then bump its reference count
4510  */
4511 static void autorun_devices(int part)
4512 {
4513         mdk_rdev_t *rdev0, *rdev, *tmp;
4514         mddev_t *mddev;
4515         char b[BDEVNAME_SIZE];
4516
4517         printk(KERN_INFO "md: autorun ...\n");
4518         while (!list_empty(&pending_raid_disks)) {
4519                 int unit;
4520                 dev_t dev;
4521                 LIST_HEAD(candidates);
4522                 rdev0 = list_entry(pending_raid_disks.next,
4523                                          mdk_rdev_t, same_set);
4524
4525                 printk(KERN_INFO "md: considering %s ...\n",
4526                         bdevname(rdev0->bdev,b));
4527                 INIT_LIST_HEAD(&candidates);
4528                 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4529                         if (super_90_load(rdev, rdev0, 0) >= 0) {
4530                                 printk(KERN_INFO "md:  adding %s ...\n",
4531                                         bdevname(rdev->bdev,b));
4532                                 list_move(&rdev->same_set, &candidates);
4533                         }
4534                 /*
4535                  * now we have a set of devices, with all of them having
4536                  * mostly sane superblocks. It's time to allocate the
4537                  * mddev.
4538                  */
4539                 if (part) {
4540                         dev = MKDEV(mdp_major,
4541                                     rdev0->preferred_minor << MdpMinorShift);
4542                         unit = MINOR(dev) >> MdpMinorShift;
4543                 } else {
4544                         dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4545                         unit = MINOR(dev);
4546                 }
4547                 if (rdev0->preferred_minor != unit) {
4548                         printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4549                                bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4550                         break;
4551                 }
4552
4553                 md_probe(dev, NULL, NULL);
4554                 mddev = mddev_find(dev);
4555                 if (!mddev || !mddev->gendisk) {
4556                         if (mddev)
4557                                 mddev_put(mddev);
4558                         printk(KERN_ERR
4559                                 "md: cannot allocate memory for md drive.\n");
4560                         break;
4561                 }
4562                 if (mddev_lock(mddev))
4563                         printk(KERN_WARNING "md: %s locked, cannot run\n",
4564                                mdname(mddev));
4565                 else if (mddev->raid_disks || mddev->major_version
4566                          || !list_empty(&mddev->disks)) {
4567                         printk(KERN_WARNING
4568                                 "md: %s already running, cannot run %s\n",
4569                                 mdname(mddev), bdevname(rdev0->bdev,b));
4570                         mddev_unlock(mddev);
4571                 } else {
4572                         printk(KERN_INFO "md: created %s\n", mdname(mddev));
4573                         mddev->persistent = 1;
4574                         rdev_for_each_list(rdev, tmp, &candidates) {
4575                                 list_del_init(&rdev->same_set);
4576                                 if (bind_rdev_to_array(rdev, mddev))
4577                                         export_rdev(rdev);
4578                         }
4579                         autorun_array(mddev);
4580                         mddev_unlock(mddev);
4581                 }
4582                 /* on success, candidates will be empty, on error
4583                  * it won't...
4584                  */
4585                 rdev_for_each_list(rdev, tmp, &candidates) {
4586                         list_del_init(&rdev->same_set);
4587                         export_rdev(rdev);
4588                 }
4589                 mddev_put(mddev);
4590         }
4591         printk(KERN_INFO "md: ... autorun DONE.\n");
4592 }
4593 #endif /* !MODULE */
4594
4595 static int get_version(void __user * arg)
4596 {
4597         mdu_version_t ver;
4598
4599         ver.major = MD_MAJOR_VERSION;
4600         ver.minor = MD_MINOR_VERSION;
4601         ver.patchlevel = MD_PATCHLEVEL_VERSION;
4602
4603         if (copy_to_user(arg, &ver, sizeof(ver)))
4604                 return -EFAULT;
4605
4606         return 0;
4607 }
4608
4609 static int get_array_info(mddev_t * mddev, void __user * arg)
4610 {
4611         mdu_array_info_t info;
4612         int nr,working,insync,failed,spare;
4613         mdk_rdev_t *rdev;
4614
4615         nr=working=insync=failed=spare=0;
4616         list_for_each_entry(rdev, &mddev->disks, same_set) {
4617                 nr++;
4618                 if (test_bit(Faulty, &rdev->flags))
4619                         failed++;
4620                 else {
4621                         working++;
4622                         if (test_bit(In_sync, &rdev->flags))
4623                                 insync++;
4624                         else
4625                                 spare++;
4626                 }
4627         }
4628
4629         info.major_version = mddev->major_version;
4630         info.minor_version = mddev->minor_version;
4631         info.patch_version = MD_PATCHLEVEL_VERSION;
4632         info.ctime         = mddev->ctime;
4633         info.level         = mddev->level;
4634         info.size          = mddev->dev_sectors / 2;
4635         if (info.size != mddev->dev_sectors / 2) /* overflow */
4636                 info.size = -1;
4637         info.nr_disks      = nr;
4638         info.raid_disks    = mddev->raid_disks;
4639         info.md_minor      = mddev->md_minor;
4640         info.not_persistent= !mddev->persistent;
4641
4642         info.utime         = mddev->utime;
4643         info.state         = 0;
4644         if (mddev->in_sync)
4645                 info.state = (1<<MD_SB_CLEAN);
4646         if (mddev->bitmap && mddev->bitmap_offset)
4647                 info.state = (1<<MD_SB_BITMAP_PRESENT);
4648         info.active_disks  = insync;
4649         info.working_disks = working;
4650         info.failed_disks  = failed;
4651         info.spare_disks   = spare;
4652
4653         info.layout        = mddev->layout;
4654         info.chunk_size    = mddev->chunk_sectors << 9;
4655
4656         if (copy_to_user(arg, &info, sizeof(info)))
4657                 return -EFAULT;
4658
4659         return 0;
4660 }
4661
4662 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4663 {
4664         mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4665         char *ptr, *buf = NULL;
4666         int err = -ENOMEM;
4667
4668         if (md_allow_write(mddev))
4669                 file = kmalloc(sizeof(*file), GFP_NOIO);
4670         else
4671                 file = kmalloc(sizeof(*file), GFP_KERNEL);
4672
4673         if (!file)
4674                 goto out;
4675
4676         /* bitmap disabled, zero the first byte and copy out */
4677         if (!mddev->bitmap || !mddev->bitmap->file) {
4678                 file->pathname[0] = '\0';
4679                 goto copy_out;
4680         }
4681
4682         buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4683         if (!buf)
4684                 goto out;
4685
4686         ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4687         if (IS_ERR(ptr))
4688                 goto out;
4689
4690         strcpy(file->pathname, ptr);
4691
4692 copy_out:
4693         err = 0;
4694         if (copy_to_user(arg, file, sizeof(*file)))
4695                 err = -EFAULT;
4696 out:
4697         kfree(buf);
4698         kfree(file);
4699         return err;
4700 }
4701
4702 static int get_disk_info(mddev_t * mddev, void __user * arg)
4703 {
4704         mdu_disk_info_t info;
4705         mdk_rdev_t *rdev;
4706
4707         if (copy_from_user(&info, arg, sizeof(info)))
4708                 return -EFAULT;
4709
4710         rdev = find_rdev_nr(mddev, info.number);
4711         if (rdev) {
4712                 info.major = MAJOR(rdev->bdev->bd_dev);
4713                 info.minor = MINOR(rdev->bdev->bd_dev);
4714                 info.raid_disk = rdev->raid_disk;
4715                 info.state = 0;
4716                 if (test_bit(Faulty, &rdev->flags))
4717                         info.state |= (1<<MD_DISK_FAULTY);
4718                 else if (test_bit(In_sync, &rdev->flags)) {
4719                         info.state |= (1<<MD_DISK_ACTIVE);
4720                         info.state |= (1<<MD_DISK_SYNC);
4721                 }
4722                 if (test_bit(WriteMostly, &rdev->flags))
4723                         info.state |= (1<<MD_DISK_WRITEMOSTLY);
4724         } else {
4725                 info.major = info.minor = 0;
4726                 info.raid_disk = -1;
4727                 info.state = (1<<MD_DISK_REMOVED);
4728         }
4729
4730         if (copy_to_user(arg, &info, sizeof(info)))
4731                 return -EFAULT;
4732
4733         return 0;
4734 }
4735
4736 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4737 {
4738         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4739         mdk_rdev_t *rdev;
4740         dev_t dev = MKDEV(info->major,info->minor);
4741
4742         if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4743                 return -EOVERFLOW;
4744
4745         if (!mddev->raid_disks) {
4746                 int err;
4747                 /* expecting a device which has a superblock */
4748                 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4749                 if (IS_ERR(rdev)) {
4750                         printk(KERN_WARNING
4751                                 "md: md_import_device returned %ld\n",
4752                                 PTR_ERR(rdev));
4753                         return PTR_ERR(rdev);
4754                 }
4755                 if (!list_empty(&mddev->disks)) {
4756                         mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4757                                                         mdk_rdev_t, same_set);
4758                         err = super_types[mddev->major_version]
4759                                 .load_super(rdev, rdev0, mddev->minor_version);
4760                         if (err < 0) {
4761                                 printk(KERN_WARNING
4762                                         "md: %s has different UUID to %s\n",
4763                                         bdevname(rdev->bdev,b),
4764                                         bdevname(rdev0->bdev,b2));
4765                                 export_rdev(rdev);
4766                                 return -EINVAL;
4767                         }
4768                 }
4769                 err = bind_rdev_to_array(rdev, mddev);
4770                 if (err)
4771                         export_rdev(rdev);
4772                 return err;
4773         }
4774
4775         /*
4776          * add_new_disk can be used once the array is assembled
4777          * to add "hot spares".  They must already have a superblock
4778          * written
4779          */
4780         if (mddev->pers) {
4781                 int err;
4782                 if (!mddev->pers->hot_add_disk) {
4783                         printk(KERN_WARNING
4784                                 "%s: personality does not support diskops!\n",
4785                                mdname(mddev));
4786                         return -EINVAL;
4787                 }
4788                 if (mddev->persistent)
4789                         rdev = md_import_device(dev, mddev->major_version,
4790                                                 mddev->minor_version);
4791                 else
4792                         rdev = md_import_device(dev, -1, -1);
4793                 if (IS_ERR(rdev)) {
4794                         printk(KERN_WARNING
4795                                 "md: md_import_device returned %ld\n",
4796                                 PTR_ERR(rdev));
4797                         return PTR_ERR(rdev);
4798                 }
4799                 /* set save_raid_disk if appropriate */
4800                 if (!mddev->persistent) {
4801                         if (info->state & (1<<MD_DISK_SYNC)  &&
4802                             info->raid_disk < mddev->raid_disks)
4803                                 rdev->raid_disk = info->raid_disk;
4804                         else
4805                                 rdev->raid_disk = -1;
4806                 } else
4807                         super_types[mddev->major_version].
4808                                 validate_super(mddev, rdev);
4809                 rdev->saved_raid_disk = rdev->raid_disk;
4810
4811                 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4812                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4813                         set_bit(WriteMostly, &rdev->flags);
4814                 else
4815                         clear_bit(WriteMostly, &rdev->flags);
4816
4817                 rdev->raid_disk = -1;
4818                 err = bind_rdev_to_array(rdev, mddev);
4819                 if (!err && !mddev->pers->hot_remove_disk) {
4820                         /* If there is hot_add_disk but no hot_remove_disk
4821                          * then added disks for geometry changes,
4822                          * and should be added immediately.
4823                          */
4824                         super_types[mddev->major_version].
4825                                 validate_super(mddev, rdev);
4826                         err = mddev->pers->hot_add_disk(mddev, rdev);
4827                         if (err)
4828                                 unbind_rdev_from_array(rdev);
4829                 }
4830                 if (err)
4831                         export_rdev(rdev);
4832                 else
4833                         sysfs_notify_dirent(rdev->sysfs_state);
4834
4835                 md_update_sb(mddev, 1);
4836                 if (mddev->degraded)
4837                         set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4838                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4839                 md_wakeup_thread(mddev->thread);
4840                 return err;
4841         }
4842
4843         /* otherwise, add_new_disk is only allowed
4844          * for major_version==0 superblocks
4845          */
4846         if (mddev->major_version != 0) {
4847                 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4848                        mdname(mddev));
4849                 return -EINVAL;
4850         }
4851
4852         if (!(info->state & (1<<MD_DISK_FAULTY))) {
4853                 int err;
4854                 rdev = md_import_device(dev, -1, 0);
4855                 if (IS_ERR(rdev)) {
4856                         printk(KERN_WARNING
4857                                 "md: error, md_import_device() returned %ld\n",
4858                                 PTR_ERR(rdev));
4859                         return PTR_ERR(rdev);
4860                 }
4861                 rdev->desc_nr = info->number;
4862                 if (info->raid_disk < mddev->raid_disks)
4863                         rdev->raid_disk = info->raid_disk;
4864                 else
4865                         rdev->raid_disk = -1;
4866
4867                 if (rdev->raid_disk < mddev->raid_disks)
4868                         if (info->state & (1<<MD_DISK_SYNC))
4869                                 set_bit(In_sync, &rdev->flags);
4870
4871                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4872                         set_bit(WriteMostly, &rdev->flags);
4873
4874                 if (!mddev->persistent) {
4875                         printk(KERN_INFO "md: nonpersistent superblock ...\n");
4876                         rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4877                 } else
4878                         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4879                 rdev->sectors = rdev->sb_start;
4880
4881                 err = bind_rdev_to_array(rdev, mddev);
4882                 if (err) {
4883                         export_rdev(rdev);
4884                         return err;
4885                 }
4886         }
4887
4888         return 0;
4889 }
4890
4891 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4892 {
4893         char b[BDEVNAME_SIZE];
4894         mdk_rdev_t *rdev;
4895
4896         rdev = find_rdev(mddev, dev);
4897         if (!rdev)
4898                 return -ENXIO;
4899
4900         if (rdev->raid_disk >= 0)
4901                 goto busy;
4902
4903         kick_rdev_from_array(rdev);
4904         md_update_sb(mddev, 1);
4905         md_new_event(mddev);
4906
4907         return 0;
4908 busy:
4909         printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4910                 bdevname(rdev->bdev,b), mdname(mddev));
4911         return -EBUSY;
4912 }
4913
4914 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4915 {
4916         char b[BDEVNAME_SIZE];
4917         int err;
4918         mdk_rdev_t *rdev;
4919
4920         if (!mddev->pers)
4921                 return -ENODEV;
4922
4923         if (mddev->major_version != 0) {
4924                 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4925                         " version-0 superblocks.\n",
4926                         mdname(mddev));
4927                 return -EINVAL;
4928         }
4929         if (!mddev->pers->hot_add_disk) {
4930                 printk(KERN_WARNING
4931                         "%s: personality does not support diskops!\n",
4932                         mdname(mddev));
4933                 return -EINVAL;
4934         }
4935
4936         rdev = md_import_device(dev, -1, 0);
4937         if (IS_ERR(rdev)) {
4938                 printk(KERN_WARNING
4939                         "md: error, md_import_device() returned %ld\n",
4940                         PTR_ERR(rdev));
4941                 return -EINVAL;
4942         }
4943
4944         if (mddev->persistent)
4945                 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4946         else
4947                 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4948
4949         rdev->sectors = rdev->sb_start;
4950
4951         if (test_bit(Faulty, &rdev->flags)) {
4952                 printk(KERN_WARNING
4953                         "md: can not hot-add faulty %s disk to %s!\n",
4954                         bdevname(rdev->bdev,b), mdname(mddev));
4955                 err = -EINVAL;
4956                 goto abort_export;
4957         }
4958         clear_bit(In_sync, &rdev->flags);
4959         rdev->desc_nr = -1;
4960         rdev->saved_raid_disk = -1;
4961         err = bind_rdev_to_array(rdev, mddev);
4962         if (err)
4963                 goto abort_export;
4964
4965         /*
4966          * The rest should better be atomic, we can have disk failures
4967          * noticed in interrupt contexts ...
4968          */
4969
4970         rdev->raid_disk = -1;
4971
4972         md_update_sb(mddev, 1);
4973
4974         /*
4975          * Kick recovery, maybe this spare has to be added to the
4976          * array immediately.
4977          */
4978         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4979         md_wakeup_thread(mddev->thread);
4980         md_new_event(mddev);
4981         return 0;
4982
4983 abort_export:
4984         export_rdev(rdev);
4985         return err;
4986 }
4987
4988 static int set_bitmap_file(mddev_t *mddev, int fd)
4989 {
4990         int err;
4991
4992         if (mddev->pers) {
4993                 if (!mddev->pers->quiesce)
4994                         return -EBUSY;
4995                 if (mddev->recovery || mddev->sync_thread)
4996                         return -EBUSY;
4997                 /* we should be able to change the bitmap.. */
4998         }
4999
5000
5001         if (fd >= 0) {
5002                 if (mddev->bitmap)
5003                         return -EEXIST; /* cannot add when bitmap is present */
5004                 mddev->bitmap_file = fget(fd);
5005
5006                 if (mddev->bitmap_file == NULL) {
5007                         printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5008                                mdname(mddev));
5009                         return -EBADF;
5010                 }
5011
5012                 err = deny_bitmap_write_access(mddev->bitmap_file);
5013                 if (err) {
5014                         printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5015                                mdname(mddev));
5016                         fput(mddev->bitmap_file);
5017                         mddev->bitmap_file = NULL;
5018                         return err;
5019                 }
5020                 mddev->bitmap_offset = 0; /* file overrides offset */
5021         } else if (mddev->bitmap == NULL)
5022                 return -ENOENT; /* cannot remove what isn't there */
5023         err = 0;
5024         if (mddev->pers) {
5025                 mddev->pers->quiesce(mddev, 1);
5026                 if (fd >= 0)
5027                         err = bitmap_create(mddev);
5028                 if (fd < 0 || err) {
5029                         bitmap_destroy(mddev);
5030                         fd = -1; /* make sure to put the file */
5031                 }
5032                 mddev->pers->quiesce(mddev, 0);
5033         }
5034         if (fd < 0) {
5035                 if (mddev->bitmap_file) {
5036                         restore_bitmap_write_access(mddev->bitmap_file);
5037                         fput(mddev->bitmap_file);
5038                 }
5039                 mddev->bitmap_file = NULL;
5040         }
5041
5042         return err;
5043 }
5044
5045 /*
5046  * set_array_info is used two different ways
5047  * The original usage is when creating a new array.
5048  * In this usage, raid_disks is > 0 and it together with
5049  *  level, size, not_persistent,layout,chunksize determine the
5050  *  shape of the array.
5051  *  This will always create an array with a type-0.90.0 superblock.
5052  * The newer usage is when assembling an array.
5053  *  In this case raid_disks will be 0, and the major_version field is
5054  *  use to determine which style super-blocks are to be found on the devices.
5055  *  The minor and patch _version numbers are also kept incase the
5056  *  super_block handler wishes to interpret them.
5057  */
5058 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5059 {
5060
5061         if (info->raid_disks == 0) {
5062                 /* just setting version number for superblock loading */
5063                 if (info->major_version < 0 ||
5064                     info->major_version >= ARRAY_SIZE(super_types) ||
5065                     super_types[info->major_version].name == NULL) {
5066                         /* maybe try to auto-load a module? */
5067                         printk(KERN_INFO
5068                                 "md: superblock version %d not known\n",
5069                                 info->major_version);
5070                         return -EINVAL;
5071                 }
5072                 mddev->major_version = info->major_version;
5073                 mddev->minor_version = info->minor_version;
5074                 mddev->patch_version = info->patch_version;
5075                 mddev->persistent = !info->not_persistent;
5076                 /* ensure mddev_put doesn't delete this now that there
5077                  * is some minimal configuration.
5078                  */
5079                 mddev->ctime         = get_seconds();
5080                 return 0;
5081         }
5082         mddev->major_version = MD_MAJOR_VERSION;
5083         mddev->minor_version = MD_MINOR_VERSION;
5084         mddev->patch_version = MD_PATCHLEVEL_VERSION;
5085         mddev->ctime         = get_seconds();
5086
5087         mddev->level         = info->level;
5088         mddev->clevel[0]     = 0;
5089         mddev->dev_sectors   = 2 * (sector_t)info->size;
5090         mddev->raid_disks    = info->raid_disks;
5091         /* don't set md_minor, it is determined by which /dev/md* was
5092          * openned
5093          */
5094         if (info->state & (1<<MD_SB_CLEAN))
5095                 mddev->recovery_cp = MaxSector;
5096         else
5097                 mddev->recovery_cp = 0;
5098         mddev->persistent    = ! info->not_persistent;
5099         mddev->external      = 0;
5100
5101         mddev->layout        = info->layout;
5102         mddev->chunk_sectors = info->chunk_size >> 9;
5103
5104         mddev->max_disks     = MD_SB_DISKS;
5105
5106         if (mddev->persistent)
5107                 mddev->flags         = 0;
5108         set_bit(MD_CHANGE_DEVS, &mddev->flags);
5109
5110         mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
5111         mddev->bitmap_offset = 0;
5112
5113         mddev->reshape_position = MaxSector;
5114
5115         /*
5116          * Generate a 128 bit UUID
5117          */
5118         get_random_bytes(mddev->uuid, 16);
5119
5120         mddev->new_level = mddev->level;
5121         mddev->new_chunk_sectors = mddev->chunk_sectors;
5122         mddev->new_layout = mddev->layout;
5123         mddev->delta_disks = 0;
5124
5125         return 0;
5126 }
5127
5128 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5129 {
5130         WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5131
5132         if (mddev->external_size)
5133                 return;
5134
5135         mddev->array_sectors = array_sectors;
5136 }
5137 EXPORT_SYMBOL(md_set_array_sectors);
5138
5139 static int update_size(mddev_t *mddev, sector_t num_sectors)
5140 {
5141         mdk_rdev_t *rdev;
5142         int rv;
5143         int fit = (num_sectors == 0);
5144
5145         if (mddev->pers->resize == NULL)
5146                 return -EINVAL;
5147         /* The "num_sectors" is the number of sectors of each device that
5148          * is used.  This can only make sense for arrays with redundancy.
5149          * linear and raid0 always use whatever space is available. We can only
5150          * consider changing this number if no resync or reconstruction is
5151          * happening, and if the new size is acceptable. It must fit before the
5152          * sb_start or, if that is <data_offset, it must fit before the size
5153          * of each device.  If num_sectors is zero, we find the largest size
5154          * that fits.
5155
5156          */
5157         if (mddev->sync_thread)
5158                 return -EBUSY;
5159         if (mddev->bitmap)
5160                 /* Sorry, cannot grow a bitmap yet, just remove it,
5161                  * grow, and re-add.
5162                  */
5163                 return -EBUSY;
5164         list_for_each_entry(rdev, &mddev->disks, same_set) {
5165                 sector_t avail = rdev->sectors;
5166
5167                 if (fit && (num_sectors == 0 || num_sectors > avail))
5168                         num_sectors = avail;
5169                 if (avail < num_sectors)
5170                         return -ENOSPC;
5171         }
5172         rv = mddev->pers->resize(mddev, num_sectors);
5173         if (!rv)
5174                 revalidate_disk(mddev->gendisk);
5175         return rv;
5176 }
5177
5178 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5179 {
5180         int rv;
5181         /* change the number of raid disks */
5182         if (mddev->pers->check_reshape == NULL)
5183                 return -EINVAL;
5184         if (raid_disks <= 0 ||
5185             raid_disks >= mddev->max_disks)
5186                 return -EINVAL;
5187         if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5188                 return -EBUSY;
5189         mddev->delta_disks = raid_disks - mddev->raid_disks;
5190
5191         rv = mddev->pers->check_reshape(mddev);
5192         return rv;
5193 }
5194
5195
5196 /*
5197  * update_array_info is used to change the configuration of an
5198  * on-line array.
5199  * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5200  * fields in the info are checked against the array.
5201  * Any differences that cannot be handled will cause an error.
5202  * Normally, only one change can be managed at a time.
5203  */
5204 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5205 {
5206         int rv = 0;
5207         int cnt = 0;
5208         int state = 0;
5209
5210         /* calculate expected state,ignoring low bits */
5211         if (mddev->bitmap && mddev->bitmap_offset)
5212                 state |= (1 << MD_SB_BITMAP_PRESENT);
5213
5214         if (mddev->major_version != info->major_version ||
5215             mddev->minor_version != info->minor_version ||
5216 /*          mddev->patch_version != info->patch_version || */
5217             mddev->ctime         != info->ctime         ||
5218             mddev->level         != info->level         ||
5219 /*          mddev->layout        != info->layout        || */
5220             !mddev->persistent   != info->not_persistent||
5221             mddev->chunk_sectors != info->chunk_size >> 9 ||
5222             /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5223             ((state^info->state) & 0xfffffe00)
5224                 )
5225                 return -EINVAL;
5226         /* Check there is only one change */
5227         if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5228                 cnt++;
5229         if (mddev->raid_disks != info->raid_disks)
5230                 cnt++;
5231         if (mddev->layout != info->layout)
5232                 cnt++;
5233         if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5234                 cnt++;
5235         if (cnt == 0)
5236                 return 0;
5237         if (cnt > 1)
5238                 return -EINVAL;
5239
5240         if (mddev->layout != info->layout) {
5241                 /* Change layout
5242                  * we don't need to do anything at the md level, the
5243                  * personality will take care of it all.
5244                  */
5245                 if (mddev->pers->check_reshape == NULL)
5246                         return -EINVAL;
5247                 else {
5248                         mddev->new_layout = info->layout;
5249                         rv = mddev->pers->check_reshape(mddev);
5250                         if (rv)
5251                                 mddev->new_layout = mddev->layout;
5252                         return rv;
5253                 }
5254         }
5255         if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5256                 rv = update_size(mddev, (sector_t)info->size * 2);
5257
5258         if (mddev->raid_disks    != info->raid_disks)
5259                 rv = update_raid_disks(mddev, info->raid_disks);
5260
5261         if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5262                 if (mddev->pers->quiesce == NULL)
5263                         return -EINVAL;
5264                 if (mddev->recovery || mddev->sync_thread)
5265                         return -EBUSY;
5266                 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5267                         /* add the bitmap */
5268                         if (mddev->bitmap)
5269                                 return -EEXIST;
5270                         if (mddev->default_bitmap_offset == 0)
5271                                 return -EINVAL;
5272                         mddev->bitmap_offset = mddev->default_bitmap_offset;
5273                         mddev->pers->quiesce(mddev, 1);
5274                         rv = bitmap_create(mddev);
5275                         if (rv)
5276                                 bitmap_destroy(mddev);
5277                         mddev->pers->quiesce(mddev, 0);
5278                 } else {
5279                         /* remove the bitmap */
5280                         if (!mddev->bitmap)
5281                                 return -ENOENT;
5282                         if (mddev->bitmap->file)
5283                                 return -EINVAL;
5284                         mddev->pers->quiesce(mddev, 1);
5285                         bitmap_destroy(mddev);
5286                         mddev->pers->quiesce(mddev, 0);
5287                         mddev->bitmap_offset = 0;
5288                 }
5289         }
5290         md_update_sb(mddev, 1);
5291         return rv;
5292 }
5293
5294 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5295 {
5296         mdk_rdev_t *rdev;
5297
5298         if (mddev->pers == NULL)
5299                 return -ENODEV;
5300
5301         rdev = find_rdev(mddev, dev);
5302         if (!rdev)
5303                 return -ENODEV;
5304
5305         md_error(mddev, rdev);
5306         return 0;
5307 }
5308
5309 /*
5310  * We have a problem here : there is no easy way to give a CHS
5311  * virtual geometry. We currently pretend that we have a 2 heads
5312  * 4 sectors (with a BIG number of cylinders...). This drives
5313  * dosfs just mad... ;-)
5314  */
5315 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5316 {
5317         mddev_t *mddev = bdev->bd_disk->private_data;
5318
5319         geo->heads = 2;
5320         geo->sectors = 4;
5321         geo->cylinders = get_capacity(mddev->gendisk) / 8;
5322         return 0;
5323 }
5324
5325 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5326                         unsigned int cmd, unsigned long arg)
5327 {
5328         int err = 0;
5329         void __user *argp = (void __user *)arg;
5330         mddev_t *mddev = NULL;
5331
5332         if (!capable(CAP_SYS_ADMIN))
5333                 return -EACCES;
5334
5335         /*
5336          * Commands dealing with the RAID driver but not any
5337          * particular array:
5338          */
5339         switch (cmd)
5340         {
5341                 case RAID_VERSION:
5342                         err = get_version(argp);
5343                         goto done;
5344
5345                 case PRINT_RAID_DEBUG:
5346                         err = 0;
5347                         md_print_devices();
5348                         goto done;
5349
5350 #ifndef MODULE
5351                 case RAID_AUTORUN:
5352                         err = 0;
5353                         autostart_arrays(arg);
5354                         goto done;
5355 #endif
5356                 default:;
5357         }
5358
5359         /*
5360          * Commands creating/starting a new array:
5361          */
5362
5363         mddev = bdev->bd_disk->private_data;
5364
5365         if (!mddev) {
5366                 BUG();
5367                 goto abort;
5368         }
5369
5370         err = mddev_lock(mddev);
5371         if (err) {
5372                 printk(KERN_INFO
5373                         "md: ioctl lock interrupted, reason %d, cmd %d\n",
5374                         err, cmd);
5375                 goto abort;
5376         }
5377
5378         switch (cmd)
5379         {
5380                 case SET_ARRAY_INFO:
5381                         {
5382                                 mdu_array_info_t info;
5383                                 if (!arg)
5384                                         memset(&info, 0, sizeof(info));
5385                                 else if (copy_from_user(&info, argp, sizeof(info))) {
5386                                         err = -EFAULT;
5387                                         goto abort_unlock;
5388                                 }
5389                                 if (mddev->pers) {
5390                                         err = update_array_info(mddev, &info);
5391                                         if (err) {
5392                                                 printk(KERN_WARNING "md: couldn't update"
5393                                                        " array info. %d\n", err);
5394                                                 goto abort_unlock;
5395                                         }
5396                                         goto done_unlock;
5397                                 }
5398                                 if (!list_empty(&mddev->disks)) {
5399                                         printk(KERN_WARNING
5400                                                "md: array %s already has disks!\n",
5401                                                mdname(mddev));
5402                                         err = -EBUSY;
5403                                         goto abort_unlock;
5404                                 }
5405                                 if (mddev->raid_disks) {
5406                                         printk(KERN_WARNING
5407                                                "md: array %s already initialised!\n",
5408                                                mdname(mddev));
5409                                         err = -EBUSY;
5410                                         goto abort_unlock;
5411                                 }
5412                                 err = set_array_info(mddev, &info);
5413                                 if (err) {
5414                                         printk(KERN_WARNING "md: couldn't set"
5415                                                " array info. %d\n", err);
5416                                         goto abort_unlock;
5417                                 }
5418                         }
5419                         goto done_unlock;
5420
5421                 default:;
5422         }
5423
5424         /*
5425          * Commands querying/configuring an existing array:
5426          */
5427         /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5428          * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5429         if ((!mddev->raid_disks && !mddev->external)
5430             && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5431             && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5432             && cmd != GET_BITMAP_FILE) {
5433                 err = -ENODEV;
5434                 goto abort_unlock;
5435         }
5436
5437         /*
5438          * Commands even a read-only array can execute:
5439          */
5440         switch (cmd)
5441         {
5442                 case GET_ARRAY_INFO:
5443                         err = get_array_info(mddev, argp);
5444                         goto done_unlock;
5445
5446                 case GET_BITMAP_FILE:
5447                         err = get_bitmap_file(mddev, argp);
5448                         goto done_unlock;
5449
5450                 case GET_DISK_INFO:
5451                         err = get_disk_info(mddev, argp);
5452                         goto done_unlock;
5453
5454                 case RESTART_ARRAY_RW:
5455                         err = restart_array(mddev);
5456                         goto done_unlock;
5457
5458                 case STOP_ARRAY:
5459                         err = do_md_stop(mddev, 0, 1);
5460                         goto done_unlock;
5461
5462                 case STOP_ARRAY_RO:
5463                         err = do_md_stop(mddev, 1, 1);
5464                         goto done_unlock;
5465
5466         }
5467
5468         /*
5469          * The remaining ioctls are changing the state of the
5470          * superblock, so we do not allow them on read-only arrays.
5471          * However non-MD ioctls (e.g. get-size) will still come through
5472          * here and hit the 'default' below, so only disallow
5473          * 'md' ioctls, and switch to rw mode if started auto-readonly.
5474          */
5475         if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5476                 if (mddev->ro == 2) {
5477                         mddev->ro = 0;
5478                         sysfs_notify_dirent(mddev->sysfs_state);
5479                         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5480                         md_wakeup_thread(mddev->thread);
5481                 } else {
5482                         err = -EROFS;
5483                         goto abort_unlock;
5484                 }
5485         }
5486
5487         switch (cmd)
5488         {
5489                 case ADD_NEW_DISK:
5490                 {
5491                         mdu_disk_info_t info;
5492                         if (copy_from_user(&info, argp, sizeof(info)))
5493                                 err = -EFAULT;
5494                         else
5495                                 err = add_new_disk(mddev, &info);
5496                         goto done_unlock;
5497                 }
5498
5499                 case HOT_REMOVE_DISK:
5500                         err = hot_remove_disk(mddev, new_decode_dev(arg));
5501                         goto done_unlock;
5502
5503                 case HOT_ADD_DISK:
5504                         err = hot_add_disk(mddev, new_decode_dev(arg));
5505                         goto done_unlock;
5506
5507                 case SET_DISK_FAULTY:
5508                         err = set_disk_faulty(mddev, new_decode_dev(arg));
5509                         goto done_unlock;
5510
5511                 case RUN_ARRAY:
5512                         err = do_md_run(mddev);
5513                         goto done_unlock;
5514
5515                 case SET_BITMAP_FILE:
5516                         err = set_bitmap_file(mddev, (int)arg);
5517                         goto done_unlock;
5518
5519                 default:
5520                         err = -EINVAL;
5521                         goto abort_unlock;
5522         }
5523
5524 done_unlock:
5525 abort_unlock:
5526         if (mddev->hold_active == UNTIL_IOCTL &&
5527             err != -EINVAL)
5528                 mddev->hold_active = 0;
5529         mddev_unlock(mddev);
5530
5531         return err;
5532 done:
5533         if (err)
5534                 MD_BUG();
5535 abort:
5536         return err;
5537 }
5538
5539 static int md_open(struct block_device *bdev, fmode_t mode)
5540 {
5541         /*
5542          * Succeed if we can lock the mddev, which confirms that
5543          * it isn't being stopped right now.
5544          */
5545         mddev_t *mddev = mddev_find(bdev->bd_dev);
5546         int err;
5547
5548         if (mddev->gendisk != bdev->bd_disk) {
5549                 /* we are racing with mddev_put which is discarding this
5550                  * bd_disk.
5551                  */
5552                 mddev_put(mddev);
5553                 /* Wait until bdev->bd_disk is definitely gone */
5554                 flush_scheduled_work();
5555                 /* Then retry the open from the top */
5556                 return -ERESTARTSYS;
5557         }
5558         BUG_ON(mddev != bdev->bd_disk->private_data);
5559
5560         if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5561                 goto out;
5562
5563         err = 0;
5564         atomic_inc(&mddev->openers);
5565         mutex_unlock(&mddev->open_mutex);
5566
5567         check_disk_change(bdev);
5568  out:
5569         return err;
5570 }
5571
5572 static int md_release(struct gendisk *disk, fmode_t mode)
5573 {
5574         mddev_t *mddev = disk->private_data;
5575
5576         BUG_ON(!mddev);
5577         atomic_dec(&mddev->openers);
5578         mddev_put(mddev);
5579
5580         return 0;
5581 }
5582
5583 static int md_media_changed(struct gendisk *disk)
5584 {
5585         mddev_t *mddev = disk->private_data;
5586
5587         return mddev->changed;
5588 }
5589
5590 static int md_revalidate(struct gendisk *disk)
5591 {
5592         mddev_t *mddev = disk->private_data;
5593
5594         mddev->changed = 0;
5595         return 0;
5596 }
5597 static const struct block_device_operations md_fops =
5598 {
5599         .owner          = THIS_MODULE,
5600         .open           = md_open,
5601         .release        = md_release,
5602         .ioctl          = md_ioctl,
5603         .getgeo         = md_getgeo,
5604         .media_changed  = md_media_changed,
5605         .revalidate_disk= md_revalidate,
5606 };
5607
5608 static int md_thread(void * arg)
5609 {
5610         mdk_thread_t *thread = arg;
5611
5612         /*
5613          * md_thread is a 'system-thread', it's priority should be very
5614          * high. We avoid resource deadlocks individually in each
5615          * raid personality. (RAID5 does preallocation) We also use RR and
5616          * the very same RT priority as kswapd, thus we will never get
5617          * into a priority inversion deadlock.
5618          *
5619          * we definitely have to have equal or higher priority than
5620          * bdflush, otherwise bdflush will deadlock if there are too
5621          * many dirty RAID5 blocks.
5622          */
5623
5624         allow_signal(SIGKILL);
5625         while (!kthread_should_stop()) {
5626
5627                 /* We need to wait INTERRUPTIBLE so that
5628                  * we don't add to the load-average.
5629                  * That means we need to be sure no signals are
5630                  * pending
5631                  */
5632                 if (signal_pending(current))
5633                         flush_signals(current);
5634
5635                 wait_event_interruptible_timeout
5636                         (thread->wqueue,
5637                          test_bit(THREAD_WAKEUP, &thread->flags)
5638                          || kthread_should_stop(),
5639                          thread->timeout);
5640
5641                 clear_bit(THREAD_WAKEUP, &thread->flags);
5642
5643                 thread->run(thread->mddev);
5644         }
5645
5646         return 0;
5647 }
5648
5649 void md_wakeup_thread(mdk_thread_t *thread)
5650 {
5651         if (thread) {
5652                 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5653                 set_bit(THREAD_WAKEUP, &thread->flags);
5654                 wake_up(&thread->wqueue);
5655         }
5656 }
5657
5658 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5659                                  const char *name)
5660 {
5661         mdk_thread_t *thread;
5662
5663         thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5664         if (!thread)
5665                 return NULL;
5666
5667         init_waitqueue_head(&thread->wqueue);
5668
5669         thread->run = run;
5670         thread->mddev = mddev;
5671         thread->timeout = MAX_SCHEDULE_TIMEOUT;
5672         thread->tsk = kthread_run(md_thread, thread,
5673                                   "%s_%s",
5674                                   mdname(thread->mddev),
5675                                   name ?: mddev->pers->name);
5676         if (IS_ERR(thread->tsk)) {
5677                 kfree(thread);
5678                 return NULL;
5679         }
5680         return thread;
5681 }
5682
5683 void md_unregister_thread(mdk_thread_t *thread)
5684 {
5685         if (!thread)
5686                 return;
5687         dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5688
5689         kthread_stop(thread->tsk);
5690         kfree(thread);
5691 }
5692
5693 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5694 {
5695         if (!mddev) {
5696                 MD_BUG();
5697                 return;
5698         }
5699
5700         if (!rdev || test_bit(Faulty, &rdev->flags))
5701                 return;
5702
5703         if (mddev->external)
5704                 set_bit(Blocked, &rdev->flags);
5705 /*
5706         dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5707                 mdname(mddev),
5708                 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5709                 __builtin_return_address(0),__builtin_return_address(1),
5710                 __builtin_return_address(2),__builtin_return_address(3));
5711 */
5712         if (!mddev->pers)
5713                 return;
5714         if (!mddev->pers->error_handler)
5715                 return;
5716         mddev->pers->error_handler(mddev,rdev);
5717         if (mddev->degraded)
5718                 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5719         set_bit(StateChanged, &rdev->flags);
5720         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5721         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5722         md_wakeup_thread(mddev->thread);
5723         md_new_event_inintr(mddev);
5724 }
5725
5726 /* seq_file implementation /proc/mdstat */
5727
5728 static void status_unused(struct seq_file *seq)
5729 {
5730         int i = 0;
5731         mdk_rdev_t *rdev;
5732
5733         seq_printf(seq, "unused devices: ");
5734
5735         list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5736                 char b[BDEVNAME_SIZE];
5737                 i++;
5738                 seq_printf(seq, "%s ",
5739                               bdevname(rdev->bdev,b));
5740         }
5741         if (!i)
5742                 seq_printf(seq, "<none>");
5743
5744         seq_printf(seq, "\n");
5745 }
5746
5747
5748 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5749 {
5750         sector_t max_sectors, resync, res;
5751         unsigned long dt, db;
5752         sector_t rt;
5753         int scale;
5754         unsigned int per_milli;
5755
5756         resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5757
5758         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5759                 max_sectors = mddev->resync_max_sectors;
5760         else
5761                 max_sectors = mddev->dev_sectors;
5762
5763         /*
5764          * Should not happen.
5765          */
5766         if (!max_sectors) {
5767                 MD_BUG();
5768                 return;
5769         }
5770         /* Pick 'scale' such that (resync>>scale)*1000 will fit
5771          * in a sector_t, and (max_sectors>>scale) will fit in a
5772          * u32, as those are the requirements for sector_div.
5773          * Thus 'scale' must be at least 10
5774          */
5775         scale = 10;
5776         if (sizeof(sector_t) > sizeof(unsigned long)) {
5777                 while ( max_sectors/2 > (1ULL<<(scale+32)))
5778                         scale++;
5779         }
5780         res = (resync>>scale)*1000;
5781         sector_div(res, (u32)((max_sectors>>scale)+1));
5782
5783         per_milli = res;
5784         {
5785                 int i, x = per_milli/50, y = 20-x;
5786                 seq_printf(seq, "[");
5787                 for (i = 0; i < x; i++)
5788                         seq_printf(seq, "=");
5789                 seq_printf(seq, ">");
5790                 for (i = 0; i < y; i++)
5791                         seq_printf(seq, ".");
5792                 seq_printf(seq, "] ");
5793         }
5794         seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5795                    (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5796                     "reshape" :
5797                     (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5798                      "check" :
5799                      (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5800                       "resync" : "recovery"))),
5801                    per_milli/10, per_milli % 10,
5802                    (unsigned long long) resync/2,
5803                    (unsigned long long) max_sectors/2);
5804
5805         /*
5806          * dt: time from mark until now
5807          * db: blocks written from mark until now
5808          * rt: remaining time
5809          *
5810          * rt is a sector_t, so could be 32bit or 64bit.
5811          * So we divide before multiply in case it is 32bit and close
5812          * to the limit.
5813          * We scale the divisor (db) by 32 to avoid loosing precision
5814          * near the end of resync when the number of remaining sectors
5815          * is close to 'db'.
5816          * We then divide rt by 32 after multiplying by db to compensate.
5817          * The '+1' avoids division by zero if db is very small.
5818          */
5819         dt = ((jiffies - mddev->resync_mark) / HZ);
5820         if (!dt) dt++;
5821         db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5822                 - mddev->resync_mark_cnt;
5823
5824         rt = max_sectors - resync;    /* number of remaining sectors */
5825         sector_div(rt, db/32+1);
5826         rt *= dt;
5827         rt >>= 5;
5828
5829         seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
5830                    ((unsigned long)rt % 60)/6);
5831
5832         seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5833 }
5834
5835 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5836 {
5837         struct list_head *tmp;
5838         loff_t l = *pos;
5839         mddev_t *mddev;
5840
5841         if (l >= 0x10000)
5842                 return NULL;
5843         if (!l--)
5844                 /* header */
5845                 return (void*)1;
5846
5847         spin_lock(&all_mddevs_lock);
5848         list_for_each(tmp,&all_mddevs)
5849                 if (!l--) {
5850                         mddev = list_entry(tmp, mddev_t, all_mddevs);
5851                         mddev_get(mddev);
5852                         spin_unlock(&all_mddevs_lock);
5853                         return mddev;
5854                 }
5855         spin_unlock(&all_mddevs_lock);
5856         if (!l--)
5857                 return (void*)2;/* tail */
5858         return NULL;
5859 }
5860
5861 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5862 {
5863         struct list_head *tmp;
5864         mddev_t *next_mddev, *mddev = v;
5865
5866         ++*pos;
5867         if (v == (void*)2)
5868                 return NULL;
5869
5870         spin_lock(&all_mddevs_lock);
5871         if (v == (void*)1)
5872                 tmp = all_mddevs.next;
5873         else
5874                 tmp = mddev->all_mddevs.next;
5875         if (tmp != &all_mddevs)
5876                 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5877         else {
5878                 next_mddev = (void*)2;
5879                 *pos = 0x10000;
5880         }
5881         spin_unlock(&all_mddevs_lock);
5882
5883         if (v != (void*)1)
5884                 mddev_put(mddev);
5885         return next_mddev;
5886
5887 }
5888
5889 static void md_seq_stop(struct seq_file *seq, void *v)
5890 {
5891         mddev_t *mddev = v;
5892
5893         if (mddev && v != (void*)1 && v != (void*)2)
5894                 mddev_put(mddev);
5895 }
5896
5897 struct mdstat_info {
5898         int event;
5899 };
5900
5901 static int md_seq_show(struct seq_file *seq, void *v)
5902 {
5903         mddev_t *mddev = v;
5904         sector_t sectors;
5905         mdk_rdev_t *rdev;
5906         struct mdstat_info *mi = seq->private;
5907         struct bitmap *bitmap;
5908
5909         if (v == (void*)1) {
5910                 struct mdk_personality *pers;
5911                 seq_printf(seq, "Personalities : ");
5912                 spin_lock(&pers_lock);
5913                 list_for_each_entry(pers, &pers_list, list)
5914                         seq_printf(seq, "[%s] ", pers->name);
5915
5916                 spin_unlock(&pers_lock);
5917                 seq_printf(seq, "\n");
5918                 mi->event = atomic_read(&md_event_count);
5919                 return 0;
5920         }
5921         if (v == (void*)2) {
5922                 status_unused(seq);
5923                 return 0;
5924         }
5925
5926         if (mddev_lock(mddev) < 0)
5927                 return -EINTR;
5928
5929         if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5930                 seq_printf(seq, "%s : %sactive", mdname(mddev),
5931                                                 mddev->pers ? "" : "in");
5932                 if (mddev->pers) {
5933                         if (mddev->ro==1)
5934                                 seq_printf(seq, " (read-only)");
5935                         if (mddev->ro==2)
5936                                 seq_printf(seq, " (auto-read-only)");
5937                         seq_printf(seq, " %s", mddev->pers->name);
5938                 }
5939
5940                 sectors = 0;
5941                 list_for_each_entry(rdev, &mddev->disks, same_set) {
5942                         char b[BDEVNAME_SIZE];
5943                         seq_printf(seq, " %s[%d]",
5944                                 bdevname(rdev->bdev,b), rdev->desc_nr);
5945                         if (test_bit(WriteMostly, &rdev->flags))
5946                                 seq_printf(seq, "(W)");
5947                         if (test_bit(Faulty, &rdev->flags)) {
5948                                 seq_printf(seq, "(F)");
5949                                 continue;
5950                         } else if (rdev->raid_disk < 0)
5951                                 seq_printf(seq, "(S)"); /* spare */
5952                         sectors += rdev->sectors;
5953                 }
5954
5955                 if (!list_empty(&mddev->disks)) {
5956                         if (mddev->pers)
5957                                 seq_printf(seq, "\n      %llu blocks",
5958                                            (unsigned long long)
5959                                            mddev->array_sectors / 2);
5960                         else
5961                                 seq_printf(seq, "\n      %llu blocks",
5962                                            (unsigned long long)sectors / 2);
5963                 }
5964                 if (mddev->persistent) {
5965                         if (mddev->major_version != 0 ||
5966                             mddev->minor_version != 90) {
5967                                 seq_printf(seq," super %d.%d",
5968                                            mddev->major_version,
5969                                            mddev->minor_version);
5970                         }
5971                 } else if (mddev->external)
5972                         seq_printf(seq, " super external:%s",
5973                                    mddev->metadata_type);
5974                 else
5975                         seq_printf(seq, " super non-persistent");
5976
5977                 if (mddev->pers) {
5978                         mddev->pers->status(seq, mddev);
5979                         seq_printf(seq, "\n      ");
5980                         if (mddev->pers->sync_request) {
5981                                 if (mddev->curr_resync > 2) {
5982                                         status_resync(seq, mddev);
5983                                         seq_printf(seq, "\n      ");
5984                                 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5985                                         seq_printf(seq, "\tresync=DELAYED\n      ");
5986                                 else if (mddev->recovery_cp < MaxSector)
5987                                         seq_printf(seq, "\tresync=PENDING\n      ");
5988                         }
5989                 } else
5990                         seq_printf(seq, "\n       ");
5991
5992                 if ((bitmap = mddev->bitmap)) {
5993                         unsigned long chunk_kb;
5994                         unsigned long flags;
5995                         spin_lock_irqsave(&bitmap->lock, flags);
5996                         chunk_kb = bitmap->chunksize >> 10;
5997                         seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5998                                 "%lu%s chunk",
5999                                 bitmap->pages - bitmap->missing_pages,
6000                                 bitmap->pages,
6001                                 (bitmap->pages - bitmap->missing_pages)
6002                                         << (PAGE_SHIFT - 10),
6003                                 chunk_kb ? chunk_kb : bitmap->chunksize,
6004                                 chunk_kb ? "KB" : "B");
6005                         if (bitmap->file) {
6006                                 seq_printf(seq, ", file: ");
6007                                 seq_path(seq, &bitmap->file->f_path, " \t\n");
6008                         }
6009
6010                         seq_printf(seq, "\n");
6011                         spin_unlock_irqrestore(&bitmap->lock, flags);
6012                 }
6013
6014                 seq_printf(seq, "\n");
6015         }
6016         mddev_unlock(mddev);
6017
6018         return 0;
6019 }
6020
6021 static const struct seq_operations md_seq_ops = {
6022         .start  = md_seq_start,
6023         .next   = md_seq_next,
6024         .stop   = md_seq_stop,
6025         .show   = md_seq_show,
6026 };
6027
6028 static int md_seq_open(struct inode *inode, struct file *file)
6029 {
6030         int error;
6031         struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6032         if (mi == NULL)
6033                 return -ENOMEM;
6034
6035         error = seq_open(file, &md_seq_ops);
6036         if (error)
6037                 kfree(mi);
6038         else {
6039                 struct seq_file *p = file->private_data;
6040                 p->private = mi;
6041                 mi->event = atomic_read(&md_event_count);
6042         }
6043         return error;
6044 }
6045
6046 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6047 {
6048         struct seq_file *m = filp->private_data;
6049         struct mdstat_info *mi = m->private;
6050         int mask;
6051
6052         poll_wait(filp, &md_event_waiters, wait);
6053
6054         /* always allow read */
6055         mask = POLLIN | POLLRDNORM;
6056
6057         if (mi->event != atomic_read(&md_event_count))
6058                 mask |= POLLERR | POLLPRI;
6059         return mask;
6060 }
6061
6062 static const struct file_operations md_seq_fops = {
6063         .owner          = THIS_MODULE,
6064         .open           = md_seq_open,
6065         .read           = seq_read,
6066         .llseek         = seq_lseek,
6067         .release        = seq_release_private,
6068         .poll           = mdstat_poll,
6069 };
6070
6071 int register_md_personality(struct mdk_personality *p)
6072 {
6073         spin_lock(&pers_lock);
6074         list_add_tail(&p->list, &pers_list);
6075         printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6076         spin_unlock(&pers_lock);
6077         return 0;
6078 }
6079
6080 int unregister_md_personality(struct mdk_personality *p)
6081 {
6082         printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6083         spin_lock(&pers_lock);
6084         list_del_init(&p->list);
6085         spin_unlock(&pers_lock);
6086         return 0;
6087 }
6088
6089 static int is_mddev_idle(mddev_t *mddev, int init)
6090 {
6091         mdk_rdev_t * rdev;
6092         int idle;
6093         int curr_events;
6094
6095         idle = 1;
6096         rcu_read_lock();
6097         rdev_for_each_rcu(rdev, mddev) {
6098                 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6099                 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6100                               (int)part_stat_read(&disk->part0, sectors[1]) -
6101                               atomic_read(&disk->sync_io);
6102                 /* sync IO will cause sync_io to increase before the disk_stats
6103                  * as sync_io is counted when a request starts, and
6104                  * disk_stats is counted when it completes.
6105                  * So resync activity will cause curr_events to be smaller than
6106                  * when there was no such activity.
6107                  * non-sync IO will cause disk_stat to increase without
6108                  * increasing sync_io so curr_events will (eventually)
6109                  * be larger than it was before.  Once it becomes
6110                  * substantially larger, the test below will cause
6111                  * the array to appear non-idle, and resync will slow
6112                  * down.
6113                  * If there is a lot of outstanding resync activity when
6114                  * we set last_event to curr_events, then all that activity
6115                  * completing might cause the array to appear non-idle
6116                  * and resync will be slowed down even though there might
6117                  * not have been non-resync activity.  This will only
6118                  * happen once though.  'last_events' will soon reflect
6119                  * the state where there is little or no outstanding
6120                  * resync requests, and further resync activity will
6121                  * always make curr_events less than last_events.
6122                  *
6123                  */
6124                 if (init || curr_events - rdev->last_events > 64) {
6125                         rdev->last_events = curr_events;
6126                         idle = 0;
6127                 }
6128         }
6129         rcu_read_unlock();
6130         return idle;
6131 }
6132
6133 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6134 {
6135         /* another "blocks" (512byte) blocks have been synced */
6136         atomic_sub(blocks, &mddev->recovery_active);
6137         wake_up(&mddev->recovery_wait);
6138         if (!ok) {
6139                 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6140                 md_wakeup_thread(mddev->thread);
6141                 // stop recovery, signal do_sync ....
6142         }
6143 }
6144
6145
6146 /* md_write_start(mddev, bi)
6147  * If we need to update some array metadata (e.g. 'active' flag
6148  * in superblock) before writing, schedule a superblock update
6149  * and wait for it to complete.
6150  */
6151 void md_write_start(mddev_t *mddev, struct bio *bi)
6152 {
6153         int did_change = 0;
6154         if (bio_data_dir(bi) != WRITE)
6155                 return;
6156
6157         BUG_ON(mddev->ro == 1);
6158         if (mddev->ro == 2) {
6159                 /* need to switch to read/write */
6160                 mddev->ro = 0;
6161                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6162                 md_wakeup_thread(mddev->thread);
6163                 md_wakeup_thread(mddev->sync_thread);
6164                 did_change = 1;
6165         }
6166         atomic_inc(&mddev->writes_pending);
6167         if (mddev->safemode == 1)
6168                 mddev->safemode = 0;
6169         if (mddev->in_sync) {
6170                 spin_lock_irq(&mddev->write_lock);
6171                 if (mddev->in_sync) {
6172                         mddev->in_sync = 0;
6173                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6174                         md_wakeup_thread(mddev->thread);
6175                         did_change = 1;
6176                 }
6177                 spin_unlock_irq(&mddev->write_lock);
6178         }
6179         if (did_change)
6180                 sysfs_notify_dirent(mddev->sysfs_state);
6181         wait_event(mddev->sb_wait,
6182                    !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6183                    !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6184 }
6185
6186 void md_write_end(mddev_t *mddev)
6187 {
6188         if (atomic_dec_and_test(&mddev->writes_pending)) {
6189                 if (mddev->safemode == 2)
6190                         md_wakeup_thread(mddev->thread);
6191                 else if (mddev->safemode_delay)
6192                         mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6193         }
6194 }
6195
6196 /* md_allow_write(mddev)
6197  * Calling this ensures that the array is marked 'active' so that writes
6198  * may proceed without blocking.  It is important to call this before
6199  * attempting a GFP_KERNEL allocation while holding the mddev lock.
6200  * Must be called with mddev_lock held.
6201  *
6202  * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6203  * is dropped, so return -EAGAIN after notifying userspace.
6204  */
6205 int md_allow_write(mddev_t *mddev)
6206 {
6207         if (!mddev->pers)
6208                 return 0;
6209         if (mddev->ro)
6210                 return 0;
6211         if (!mddev->pers->sync_request)
6212                 return 0;
6213
6214         spin_lock_irq(&mddev->write_lock);
6215         if (mddev->in_sync) {
6216                 mddev->in_sync = 0;
6217                 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6218                 if (mddev->safemode_delay &&
6219                     mddev->safemode == 0)
6220                         mddev->safemode = 1;
6221                 spin_unlock_irq(&mddev->write_lock);
6222                 md_update_sb(mddev, 0);
6223                 sysfs_notify_dirent(mddev->sysfs_state);
6224         } else
6225                 spin_unlock_irq(&mddev->write_lock);
6226
6227         if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6228                 return -EAGAIN;
6229         else
6230                 return 0;
6231 }
6232 EXPORT_SYMBOL_GPL(md_allow_write);
6233
6234 #define SYNC_MARKS      10
6235 #define SYNC_MARK_STEP  (3*HZ)
6236 void md_do_sync(mddev_t *mddev)
6237 {
6238         mddev_t *mddev2;
6239         unsigned int currspeed = 0,
6240                  window;
6241         sector_t max_sectors,j, io_sectors;
6242         unsigned long mark[SYNC_MARKS];
6243         sector_t mark_cnt[SYNC_MARKS];
6244         int last_mark,m;
6245         struct list_head *tmp;
6246         sector_t last_check;
6247         int skipped = 0;
6248         mdk_rdev_t *rdev;
6249         char *desc;
6250
6251         /* just incase thread restarts... */
6252         if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6253                 return;
6254         if (mddev->ro) /* never try to sync a read-only array */
6255                 return;
6256
6257         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6258                 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6259                         desc = "data-check";
6260                 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6261                         desc = "requested-resync";
6262                 else
6263                         desc = "resync";
6264         } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6265                 desc = "reshape";
6266         else
6267                 desc = "recovery";
6268
6269         /* we overload curr_resync somewhat here.
6270          * 0 == not engaged in resync at all
6271          * 2 == checking that there is no conflict with another sync
6272          * 1 == like 2, but have yielded to allow conflicting resync to
6273          *              commense
6274          * other == active in resync - this many blocks
6275          *
6276          * Before starting a resync we must have set curr_resync to
6277          * 2, and then checked that every "conflicting" array has curr_resync
6278          * less than ours.  When we find one that is the same or higher
6279          * we wait on resync_wait.  To avoid deadlock, we reduce curr_resync
6280          * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6281          * This will mean we have to start checking from the beginning again.
6282          *
6283          */
6284
6285         do {
6286                 mddev->curr_resync = 2;
6287
6288         try_again:
6289                 if (kthread_should_stop()) {
6290                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6291                         goto skip;
6292                 }
6293                 for_each_mddev(mddev2, tmp) {
6294                         if (mddev2 == mddev)
6295                                 continue;
6296                         if (!mddev->parallel_resync
6297                         &&  mddev2->curr_resync
6298                         &&  match_mddev_units(mddev, mddev2)) {
6299                                 DEFINE_WAIT(wq);
6300                                 if (mddev < mddev2 && mddev->curr_resync == 2) {
6301                                         /* arbitrarily yield */
6302                                         mddev->curr_resync = 1;
6303                                         wake_up(&resync_wait);
6304                                 }
6305                                 if (mddev > mddev2 && mddev->curr_resync == 1)
6306                                         /* no need to wait here, we can wait the next
6307                                          * time 'round when curr_resync == 2
6308                                          */
6309                                         continue;
6310                                 /* We need to wait 'interruptible' so as not to
6311                                  * contribute to the load average, and not to
6312                                  * be caught by 'softlockup'
6313                                  */
6314                                 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6315                                 if (!kthread_should_stop() &&
6316                                     mddev2->curr_resync >= mddev->curr_resync) {
6317                                         printk(KERN_INFO "md: delaying %s of %s"
6318                                                " until %s has finished (they"
6319                                                " share one or more physical units)\n",
6320                                                desc, mdname(mddev), mdname(mddev2));
6321                                         mddev_put(mddev2);
6322                                         if (signal_pending(current))
6323                                                 flush_signals(current);
6324                                         schedule();
6325                                         finish_wait(&resync_wait, &wq);
6326                                         goto try_again;
6327                                 }
6328                                 finish_wait(&resync_wait, &wq);
6329                         }
6330                 }
6331         } while (mddev->curr_resync < 2);
6332
6333         j = 0;
6334         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6335                 /* resync follows the size requested by the personality,
6336                  * which defaults to physical size, but can be virtual size
6337                  */
6338                 max_sectors = mddev->resync_max_sectors;
6339                 mddev->resync_mismatches = 0;
6340                 /* we don't use the checkpoint if there's a bitmap */
6341                 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6342                         j = mddev->resync_min;
6343                 else if (!mddev->bitmap)
6344                         j = mddev->recovery_cp;
6345
6346         } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6347                 max_sectors = mddev->dev_sectors;
6348         else {
6349                 /* recovery follows the physical size of devices */
6350                 max_sectors = mddev->dev_sectors;
6351                 j = MaxSector;
6352                 list_for_each_entry(rdev, &mddev->disks, same_set)
6353                         if (rdev->raid_disk >= 0 &&
6354                             !test_bit(Faulty, &rdev->flags) &&
6355                             !test_bit(In_sync, &rdev->flags) &&
6356                             rdev->recovery_offset < j)
6357                                 j = rdev->recovery_offset;
6358         }
6359
6360         printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6361         printk(KERN_INFO "md: minimum _guaranteed_  speed:"
6362                 " %d KB/sec/disk.\n", speed_min(mddev));
6363         printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6364                "(but not more than %d KB/sec) for %s.\n",
6365                speed_max(mddev), desc);
6366
6367         is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6368
6369         io_sectors = 0;
6370         for (m = 0; m < SYNC_MARKS; m++) {
6371                 mark[m] = jiffies;
6372                 mark_cnt[m] = io_sectors;
6373         }
6374         last_mark = 0;
6375         mddev->resync_mark = mark[last_mark];
6376         mddev->resync_mark_cnt = mark_cnt[last_mark];
6377
6378         /*
6379          * Tune reconstruction:
6380          */
6381         window = 32*(PAGE_SIZE/512);
6382         printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6383                 window/2,(unsigned long long) max_sectors/2);
6384
6385         atomic_set(&mddev->recovery_active, 0);
6386         last_check = 0;
6387
6388         if (j>2) {
6389                 printk(KERN_INFO
6390                        "md: resuming %s of %s from checkpoint.\n",
6391                        desc, mdname(mddev));
6392                 mddev->curr_resync = j;
6393         }
6394
6395         while (j < max_sectors) {
6396                 sector_t sectors;
6397
6398                 skipped = 0;
6399
6400                 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6401                     ((mddev->curr_resync > mddev->curr_resync_completed &&
6402                       (mddev->curr_resync - mddev->curr_resync_completed)
6403                       > (max_sectors >> 4)) ||
6404                      (j - mddev->curr_resync_completed)*2
6405                      >= mddev->resync_max - mddev->curr_resync_completed
6406                             )) {
6407                         /* time to update curr_resync_completed */
6408                         blk_unplug(mddev->queue);
6409                         wait_event(mddev->recovery_wait,
6410                                    atomic_read(&mddev->recovery_active) == 0);
6411                         mddev->curr_resync_completed =
6412                                 mddev->curr_resync;
6413                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6414                         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6415                 }
6416
6417                 while (j >= mddev->resync_max && !kthread_should_stop()) {
6418                         /* As this condition is controlled by user-space,
6419                          * we can block indefinitely, so use '_interruptible'
6420                          * to avoid triggering warnings.
6421                          */
6422                         flush_signals(current); /* just in case */
6423                         wait_event_interruptible(mddev->recovery_wait,
6424                                                  mddev->resync_max > j
6425                                                  || kthread_should_stop());
6426                 }
6427
6428                 if (kthread_should_stop())
6429                         goto interrupted;
6430
6431                 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6432                                                   currspeed < speed_min(mddev));
6433                 if (sectors == 0) {
6434                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6435                         goto out;
6436                 }
6437
6438                 if (!skipped) { /* actual IO requested */
6439                         io_sectors += sectors;
6440                         atomic_add(sectors, &mddev->recovery_active);
6441                 }
6442
6443                 j += sectors;
6444                 if (j>1) mddev->curr_resync = j;
6445                 mddev->curr_mark_cnt = io_sectors;
6446                 if (last_check == 0)
6447                         /* this is the earliers that rebuilt will be
6448                          * visible in /proc/mdstat
6449                          */
6450                         md_new_event(mddev);
6451
6452                 if (last_check + window > io_sectors || j == max_sectors)
6453                         continue;
6454
6455                 last_check = io_sectors;
6456
6457                 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6458                         break;
6459
6460         repeat:
6461                 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6462                         /* step marks */
6463                         int next = (last_mark+1) % SYNC_MARKS;
6464
6465                         mddev->resync_mark = mark[next];
6466                         mddev->resync_mark_cnt = mark_cnt[next];
6467                         mark[next] = jiffies;
6468                         mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6469                         last_mark = next;
6470                 }
6471
6472
6473                 if (kthread_should_stop())
6474                         goto interrupted;
6475
6476
6477                 /*
6478                  * this loop exits only if either when we are slower than
6479                  * the 'hard' speed limit, or the system was IO-idle for
6480                  * a jiffy.
6481                  * the system might be non-idle CPU-wise, but we only care
6482                  * about not overloading the IO subsystem. (things like an
6483                  * e2fsck being done on the RAID array should execute fast)
6484                  */
6485                 blk_unplug(mddev->queue);
6486                 cond_resched();
6487
6488                 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6489                         /((jiffies-mddev->resync_mark)/HZ +1) +1;
6490
6491                 if (currspeed > speed_min(mddev)) {
6492                         if ((currspeed > speed_max(mddev)) ||
6493                                         !is_mddev_idle(mddev, 0)) {
6494                                 msleep(500);
6495                                 goto repeat;
6496                         }
6497                 }
6498         }
6499         printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6500         /*
6501          * this also signals 'finished resyncing' to md_stop
6502          */
6503  out:
6504         blk_unplug(mddev->queue);
6505
6506         wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6507
6508         /* tell personality that we are finished */
6509         mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6510
6511         if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6512             mddev->curr_resync > 2) {
6513                 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6514                         if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6515                                 if (mddev->curr_resync >= mddev->recovery_cp) {
6516                                         printk(KERN_INFO
6517                                                "md: checkpointing %s of %s.\n",
6518                                                desc, mdname(mddev));
6519                                         mddev->recovery_cp = mddev->curr_resync;
6520                                 }
6521                         } else
6522                                 mddev->recovery_cp = MaxSector;
6523                 } else {
6524                         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6525                                 mddev->curr_resync = MaxSector;
6526                         list_for_each_entry(rdev, &mddev->disks, same_set)
6527                                 if (rdev->raid_disk >= 0 &&
6528                                     !test_bit(Faulty, &rdev->flags) &&
6529                                     !test_bit(In_sync, &rdev->flags) &&
6530                                     rdev->recovery_offset < mddev->curr_resync)
6531                                         rdev->recovery_offset = mddev->curr_resync;
6532                 }
6533         }
6534         set_bit(MD_CHANGE_DEVS, &mddev->flags);
6535
6536  skip:
6537         mddev->curr_resync = 0;
6538         mddev->curr_resync_completed = 0;
6539         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6540                 /* We completed so max setting can be forgotten. */
6541                 mddev->resync_max = MaxSector;
6542         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6543         wake_up(&resync_wait);
6544         set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6545         md_wakeup_thread(mddev->thread);
6546         return;
6547
6548  interrupted:
6549         /*
6550          * got a signal, exit.
6551          */
6552         printk(KERN_INFO
6553                "md: md_do_sync() got signal ... exiting\n");
6554         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6555         goto out;
6556
6557 }
6558 EXPORT_SYMBOL_GPL(md_do_sync);
6559
6560
6561 static int remove_and_add_spares(mddev_t *mddev)
6562 {
6563         mdk_rdev_t *rdev;
6564         int spares = 0;
6565
6566         mddev->curr_resync_completed = 0;
6567
6568         list_for_each_entry(rdev, &mddev->disks, same_set)
6569                 if (rdev->raid_disk >= 0 &&
6570                     !test_bit(Blocked, &rdev->flags) &&
6571                     (test_bit(Faulty, &rdev->flags) ||
6572                      ! test_bit(In_sync, &rdev->flags)) &&
6573                     atomic_read(&rdev->nr_pending)==0) {
6574                         if (mddev->pers->hot_remove_disk(
6575                                     mddev, rdev->raid_disk)==0) {
6576                                 char nm[20];
6577                                 sprintf(nm,"rd%d", rdev->raid_disk);
6578                                 sysfs_remove_link(&mddev->kobj, nm);
6579                                 rdev->raid_disk = -1;
6580                         }
6581                 }
6582
6583         if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6584                 list_for_each_entry(rdev, &mddev->disks, same_set) {
6585                         if (rdev->raid_disk >= 0 &&
6586                             !test_bit(In_sync, &rdev->flags) &&
6587                             !test_bit(Blocked, &rdev->flags))
6588                                 spares++;
6589                         if (rdev->raid_disk < 0
6590                             && !test_bit(Faulty, &rdev->flags)) {
6591                                 rdev->recovery_offset = 0;
6592                                 if (mddev->pers->
6593                                     hot_add_disk(mddev, rdev) == 0) {
6594                                         char nm[20];
6595                                         sprintf(nm, "rd%d", rdev->raid_disk);
6596                                         if (sysfs_create_link(&mddev->kobj,
6597                                                               &rdev->kobj, nm))
6598                                                 printk(KERN_WARNING
6599                                                        "md: cannot register "
6600                                                        "%s for %s\n",
6601                                                        nm, mdname(mddev));
6602                                         spares++;
6603                                         md_new_event(mddev);
6604                                 } else
6605                                         break;
6606                         }
6607                 }
6608         }
6609         return spares;
6610 }
6611 /*
6612  * This routine is regularly called by all per-raid-array threads to
6613  * deal with generic issues like resync and super-block update.
6614  * Raid personalities that don't have a thread (linear/raid0) do not
6615  * need this as they never do any recovery or update the superblock.
6616  *
6617  * It does not do any resync itself, but rather "forks" off other threads
6618  * to do that as needed.
6619  * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6620  * "->recovery" and create a thread at ->sync_thread.
6621  * When the thread finishes it sets MD_RECOVERY_DONE
6622  * and wakeups up this thread which will reap the thread and finish up.
6623  * This thread also removes any faulty devices (with nr_pending == 0).
6624  *
6625  * The overall approach is:
6626  *  1/ if the superblock needs updating, update it.
6627  *  2/ If a recovery thread is running, don't do anything else.
6628  *  3/ If recovery has finished, clean up, possibly marking spares active.
6629  *  4/ If there are any faulty devices, remove them.
6630  *  5/ If array is degraded, try to add spares devices
6631  *  6/ If array has spares or is not in-sync, start a resync thread.
6632  */
6633 void md_check_recovery(mddev_t *mddev)
6634 {
6635         mdk_rdev_t *rdev;
6636
6637
6638         if (mddev->bitmap)
6639                 bitmap_daemon_work(mddev);
6640
6641         if (mddev->ro)
6642                 return;
6643
6644         if (signal_pending(current)) {
6645                 if (mddev->pers->sync_request && !mddev->external) {
6646                         printk(KERN_INFO "md: %s in immediate safe mode\n",
6647                                mdname(mddev));
6648                         mddev->safemode = 2;
6649                 }
6650                 flush_signals(current);
6651         }
6652
6653         if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6654                 return;
6655         if ( ! (
6656                 (mddev->flags && !mddev->external) ||
6657                 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6658                 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6659                 (mddev->external == 0 && mddev->safemode == 1) ||
6660                 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6661                  && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6662                 ))
6663                 return;
6664
6665         if (mddev_trylock(mddev)) {
6666                 int spares = 0;
6667
6668                 if (mddev->ro) {
6669                         /* Only thing we do on a ro array is remove
6670                          * failed devices.
6671                          */
6672                         remove_and_add_spares(mddev);
6673                         clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6674                         goto unlock;
6675                 }
6676
6677                 if (!mddev->external) {
6678                         int did_change = 0;
6679                         spin_lock_irq(&mddev->write_lock);
6680                         if (mddev->safemode &&
6681                             !atomic_read(&mddev->writes_pending) &&
6682                             !mddev->in_sync &&
6683                             mddev->recovery_cp == MaxSector) {
6684                                 mddev->in_sync = 1;
6685                                 did_change = 1;
6686                                 if (mddev->persistent)
6687                                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6688                         }
6689                         if (mddev->safemode == 1)
6690                                 mddev->safemode = 0;
6691                         spin_unlock_irq(&mddev->write_lock);
6692                         if (did_change)
6693                                 sysfs_notify_dirent(mddev->sysfs_state);
6694                 }
6695
6696                 if (mddev->flags)
6697                         md_update_sb(mddev, 0);
6698
6699                 list_for_each_entry(rdev, &mddev->disks, same_set)
6700                         if (test_and_clear_bit(StateChanged, &rdev->flags))
6701                                 sysfs_notify_dirent(rdev->sysfs_state);
6702
6703
6704                 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6705                     !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6706                         /* resync/recovery still happening */
6707                         clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6708                         goto unlock;
6709                 }
6710                 if (mddev->sync_thread) {
6711                         /* resync has finished, collect result */
6712                         md_unregister_thread(mddev->sync_thread);
6713                         mddev->sync_thread = NULL;
6714                         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6715                             !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6716                                 /* success...*/
6717                                 /* activate any spares */
6718                                 if (mddev->pers->spare_active(mddev))
6719                                         sysfs_notify(&mddev->kobj, NULL,
6720                                                      "degraded");
6721                         }
6722                         if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6723                             mddev->pers->finish_reshape)
6724                                 mddev->pers->finish_reshape(mddev);
6725                         md_update_sb(mddev, 1);
6726
6727                         /* if array is no-longer degraded, then any saved_raid_disk
6728                          * information must be scrapped
6729                          */
6730                         if (!mddev->degraded)
6731                                 list_for_each_entry(rdev, &mddev->disks, same_set)
6732                                         rdev->saved_raid_disk = -1;
6733
6734                         mddev->recovery = 0;
6735                         /* flag recovery needed just to double check */
6736                         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6737                         sysfs_notify_dirent(mddev->sysfs_action);
6738                         md_new_event(mddev);
6739                         goto unlock;
6740                 }
6741                 /* Set RUNNING before clearing NEEDED to avoid
6742                  * any transients in the value of "sync_action".
6743                  */
6744                 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6745                 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6746                 /* Clear some bits that don't mean anything, but
6747                  * might be left set
6748                  */
6749                 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6750                 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6751
6752                 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6753                         goto unlock;
6754                 /* no recovery is running.
6755                  * remove any failed drives, then
6756                  * add spares if possible.
6757                  * Spare are also removed and re-added, to allow
6758                  * the personality to fail the re-add.
6759                  */
6760
6761                 if (mddev->reshape_position != MaxSector) {
6762                         if (mddev->pers->check_reshape == NULL ||
6763                             mddev->pers->check_reshape(mddev) != 0)
6764                                 /* Cannot proceed */
6765                                 goto unlock;
6766                         set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6767                         clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6768                 } else if ((spares = remove_and_add_spares(mddev))) {
6769                         clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6770                         clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6771                         clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6772                         set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6773                 } else if (mddev->recovery_cp < MaxSector) {
6774                         set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6775                         clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6776                 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6777                         /* nothing to be done ... */
6778                         goto unlock;
6779
6780                 if (mddev->pers->sync_request) {
6781                         if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6782                                 /* We are adding a device or devices to an array
6783                                  * which has the bitmap stored on all devices.
6784                                  * So make sure all bitmap pages get written
6785                                  */
6786                                 bitmap_write_all(mddev->bitmap);
6787                         }
6788                         mddev->sync_thread = md_register_thread(md_do_sync,
6789                                                                 mddev,
6790                                                                 "resync");
6791                         if (!mddev->sync_thread) {
6792                                 printk(KERN_ERR "%s: could not start resync"
6793                                         " thread...\n",
6794                                         mdname(mddev));
6795                                 /* leave the spares where they are, it shouldn't hurt */
6796                                 mddev->recovery = 0;
6797                         } else
6798                                 md_wakeup_thread(mddev->sync_thread);
6799                         sysfs_notify_dirent(mddev->sysfs_action);
6800                         md_new_event(mddev);
6801                 }
6802         unlock:
6803                 if (!mddev->sync_thread) {
6804                         clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6805                         if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6806                                                &mddev->recovery))
6807                                 if (mddev->sysfs_action)
6808                                         sysfs_notify_dirent(mddev->sysfs_action);
6809                 }
6810                 mddev_unlock(mddev);
6811         }
6812 }
6813
6814 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6815 {
6816         sysfs_notify_dirent(rdev->sysfs_state);
6817         wait_event_timeout(rdev->blocked_wait,
6818                            !test_bit(Blocked, &rdev->flags),
6819                            msecs_to_jiffies(5000));
6820         rdev_dec_pending(rdev, mddev);
6821 }
6822 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6823
6824 static int md_notify_reboot(struct notifier_block *this,
6825                             unsigned long code, void *x)
6826 {
6827         struct list_head *tmp;
6828         mddev_t *mddev;
6829
6830         if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6831
6832                 printk(KERN_INFO "md: stopping all md devices.\n");
6833
6834                 for_each_mddev(mddev, tmp)
6835                         if (mddev_trylock(mddev)) {
6836                                 /* Force a switch to readonly even array
6837                                  * appears to still be in use.  Hence
6838                                  * the '100'.
6839                                  */
6840                                 do_md_stop(mddev, 1, 100);
6841                                 mddev_unlock(mddev);
6842                         }
6843                 /*
6844                  * certain more exotic SCSI devices are known to be
6845                  * volatile wrt too early system reboots. While the
6846                  * right place to handle this issue is the given
6847                  * driver, we do want to have a safe RAID driver ...
6848                  */
6849                 mdelay(1000*1);
6850         }
6851         return NOTIFY_DONE;
6852 }
6853
6854 static struct notifier_block md_notifier = {
6855         .notifier_call  = md_notify_reboot,
6856         .next           = NULL,
6857         .priority       = INT_MAX, /* before any real devices */
6858 };
6859
6860 static void md_geninit(void)
6861 {
6862         dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6863
6864         proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6865 }
6866
6867 static int __init md_init(void)
6868 {
6869         if (register_blkdev(MD_MAJOR, "md"))
6870                 return -1;
6871         if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6872                 unregister_blkdev(MD_MAJOR, "md");
6873                 return -1;
6874         }
6875         blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6876                             md_probe, NULL, NULL);
6877         blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6878                             md_probe, NULL, NULL);
6879
6880         register_reboot_notifier(&md_notifier);
6881         raid_table_header = register_sysctl_table(raid_root_table);
6882
6883         md_geninit();
6884         return 0;
6885 }
6886
6887
6888 #ifndef MODULE
6889
6890 /*
6891  * Searches all registered partitions for autorun RAID arrays
6892  * at boot time.
6893  */
6894
6895 static LIST_HEAD(all_detected_devices);
6896 struct detected_devices_node {
6897         struct list_head list;
6898         dev_t dev;
6899 };
6900
6901 void md_autodetect_dev(dev_t dev)
6902 {
6903         struct detected_devices_node *node_detected_dev;
6904
6905         node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6906         if (node_detected_dev) {
6907                 node_detected_dev->dev = dev;
6908                 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6909         } else {
6910                 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6911                         ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6912         }
6913 }
6914
6915
6916 static void autostart_arrays(int part)
6917 {
6918         mdk_rdev_t *rdev;
6919         struct detected_devices_node *node_detected_dev;
6920         dev_t dev;
6921         int i_scanned, i_passed;
6922
6923         i_scanned = 0;
6924         i_passed = 0;
6925
6926         printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6927
6928         while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6929                 i_scanned++;
6930                 node_detected_dev = list_entry(all_detected_devices.next,
6931                                         struct detected_devices_node, list);
6932                 list_del(&node_detected_dev->list);
6933                 dev = node_detected_dev->dev;
6934                 kfree(node_detected_dev);
6935                 rdev = md_import_device(dev,0, 90);
6936                 if (IS_ERR(rdev))
6937                         continue;
6938
6939                 if (test_bit(Faulty, &rdev->flags)) {
6940                         MD_BUG();
6941                         continue;
6942                 }
6943                 set_bit(AutoDetected, &rdev->flags);
6944                 list_add(&rdev->same_set, &pending_raid_disks);
6945                 i_passed++;
6946         }
6947
6948         printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6949                                                 i_scanned, i_passed);
6950
6951         autorun_devices(part);
6952 }
6953
6954 #endif /* !MODULE */
6955
6956 static __exit void md_exit(void)
6957 {
6958         mddev_t *mddev;
6959         struct list_head *tmp;
6960
6961         blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6962         blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6963
6964         unregister_blkdev(MD_MAJOR,"md");
6965         unregister_blkdev(mdp_major, "mdp");
6966         unregister_reboot_notifier(&md_notifier);
6967         unregister_sysctl_table(raid_table_header);
6968         remove_proc_entry("mdstat", NULL);
6969         for_each_mddev(mddev, tmp) {
6970                 export_array(mddev);
6971                 mddev->hold_active = 0;
6972         }
6973 }
6974
6975 subsys_initcall(md_init);
6976 module_exit(md_exit)
6977
6978 static int get_ro(char *buffer, struct kernel_param *kp)
6979 {
6980         return sprintf(buffer, "%d", start_readonly);
6981 }
6982 static int set_ro(const char *val, struct kernel_param *kp)
6983 {
6984         char *e;
6985         int num = simple_strtoul(val, &e, 10);
6986         if (*val && (*e == '\0' || *e == '\n')) {
6987                 start_readonly = num;
6988                 return 0;
6989         }
6990         return -EINVAL;
6991 }
6992
6993 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6994 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6995
6996 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6997
6998 EXPORT_SYMBOL(register_md_personality);
6999 EXPORT_SYMBOL(unregister_md_personality);
7000 EXPORT_SYMBOL(md_error);
7001 EXPORT_SYMBOL(md_done_sync);
7002 EXPORT_SYMBOL(md_write_start);
7003 EXPORT_SYMBOL(md_write_end);
7004 EXPORT_SYMBOL(md_register_thread);
7005 EXPORT_SYMBOL(md_unregister_thread);
7006 EXPORT_SYMBOL(md_wakeup_thread);
7007 EXPORT_SYMBOL(md_check_recovery);
7008 MODULE_LICENSE("GPL");
7009 MODULE_ALIAS("md");
7010 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);