fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/export.h>
  18 #include <linux/namei.h>
  19 #include <linux/mount.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/quotaops.h>
  22 #include <linux/lockdep.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "bmap.h"
  27 #include "glock.h"
  28 #include "glops.h"
  29 #include "inode.h"
  30 #include "recovery.h"
  31 #include "rgrp.h"
  32 #include "super.h"
  33 #include "sys.h"
  34 #include "util.h"
  35 #include "log.h"
  36 #include "quota.h"
  37 #include "dir.h"
  38 #include "trace_gfs2.h"
  39
  40 #define DO 0
  41 #define UNDO 1
  42
  43 /**
  44  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  45  * @gt: tune
  46  *
  47  */
  48
  49 static void gfs2_tune_init(struct gfs2_tune *gt)
  50 {
  51         spin_lock_init(&gt->gt_spin);
  52
  53         gt->gt_quota_simul_sync = 64;
  54         gt->gt_quota_warn_period = 10;
  55         gt->gt_quota_scale_num = 1;
  56         gt->gt_quota_scale_den = 1;
  57         gt->gt_new_files_jdata = 0;
  58         gt->gt_max_readahead = 1 << 18;
  59         gt->gt_complain_secs = 10;
  60 }
  61
  62 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  63 {
  64         struct gfs2_sbd *sdp;
  65
  66         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  67         if (!sdp)
  68                 return NULL;
  69
  70         sb->s_fs_info = sdp;
  71         sdp->sd_vfs = sb;
  72         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
  73         if (!sdp->sd_lkstats) {
  74                 kfree(sdp);
  75                 return NULL;
  76         }
  77
  78         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  79         gfs2_tune_init(&sdp->sd_tune);
  80
  81         init_waitqueue_head(&sdp->sd_glock_wait);
  82         atomic_set(&sdp->sd_glock_disposal, 0);
  83         init_completion(&sdp->sd_locking_init);
  84         spin_lock_init(&sdp->sd_statfs_spin);
  85
  86         spin_lock_init(&sdp->sd_rindex_spin);
  87         sdp->sd_rindex_tree.rb_node = NULL;
  88
  89         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  90         spin_lock_init(&sdp->sd_jindex_spin);
  91         mutex_init(&sdp->sd_jindex_mutex);
  92
  93         INIT_LIST_HEAD(&sdp->sd_quota_list);
  94         mutex_init(&sdp->sd_quota_mutex);
  95         init_waitqueue_head(&sdp->sd_quota_wait);
  96         INIT_LIST_HEAD(&sdp->sd_trunc_list);
  97         spin_lock_init(&sdp->sd_trunc_lock);
  98
  99         spin_lock_init(&sdp->sd_log_lock);
 100         atomic_set(&sdp->sd_log_pinned, 0);
 101         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 102         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 103         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 104         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 105
 106         init_waitqueue_head(&sdp->sd_log_waitq);
 107         init_waitqueue_head(&sdp->sd_logd_waitq);
 108         spin_lock_init(&sdp->sd_ail_lock);
 109         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 110         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 111
 112         init_rwsem(&sdp->sd_log_flush_lock);
 113         atomic_set(&sdp->sd_log_in_flight, 0);
 114         init_waitqueue_head(&sdp->sd_log_flush_wait);
 115
 116         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 117
 118         return sdp;
 119 }
 120
 121
 122 /**
 123  * gfs2_check_sb - Check superblock
 124  * @sdp: the filesystem
 125  * @sb: The superblock
 126  * @silent: Don't print a message if the check fails
 127  *
 128  * Checks the version code of the FS is one that we understand how to
 129  * read and that the sizes of the various on-disk structures have not
 130  * changed.
 131  */
 132
 133 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 134 {
 135         struct gfs2_sb_host *sb = &sdp->sd_sb;
 136
 137         if (sb->sb_magic != GFS2_MAGIC ||
 138             sb->sb_type != GFS2_METATYPE_SB) {
 139                 if (!silent)
 140                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 141                 return -EINVAL;
 142         }
 143
 144         /*  If format numbers match exactly, we're done.  */
 145
 146         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 147             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 148                 return 0;
 149
 150         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 151
 152         return -EINVAL;
 153 }
 154
 155 static void end_bio_io_page(struct bio *bio, int error)
 156 {
 157         struct page *page = bio->bi_private;
 158
 159         if (!error)
 160                 SetPageUptodate(page);
 161         else
 162                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 163         unlock_page(page);
 164 }
 165
 166 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 167 {
 168         struct gfs2_sb_host *sb = &sdp->sd_sb;
 169         struct super_block *s = sdp->sd_vfs;
 170         const struct gfs2_sb *str = buf;
 171
 172         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 173         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 174         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 175         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 176         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 177         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 178         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 179         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 180         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 181         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 182         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 183
 184         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 185         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 186         memcpy(s->s_uuid, str->sb_uuid, 16);
 187 }
 188
 189 /**
 190  * gfs2_read_super - Read the gfs2 super block from disk
 191  * @sdp: The GFS2 super block
 192  * @sector: The location of the super block
 193  * @error: The error code to return
 194  *
 195  * This uses the bio functions to read the super block from disk
 196  * because we want to be 100% sure that we never read cached data.
 197  * A super block is read twice only during each GFS2 mount and is
 198  * never written to by the filesystem. The first time its read no
 199  * locks are held, and the only details which are looked at are those
 200  * relating to the locking protocol. Once locking is up and working,
 201  * the sb is read again under the lock to establish the location of
 202  * the master directory (contains pointers to journals etc) and the
 203  * root directory.
 204  *
 205  * Returns: 0 on success or error
 206  */
 207
 208 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 209 {
 210         struct super_block *sb = sdp->sd_vfs;
 211         struct gfs2_sb *p;
 212         struct page *page;
 213         struct bio *bio;
 214
 215         page = alloc_page(GFP_NOFS);
 216         if (unlikely(!page))
 217                 return -ENOBUFS;
 218
 219         ClearPageUptodate(page);
 220         ClearPageDirty(page);
 221         lock_page(page);
 222
 223         bio = bio_alloc(GFP_NOFS, 1);
 224         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 225         bio->bi_bdev = sb->s_bdev;
 226         bio_add_page(bio, page, PAGE_SIZE, 0);
 227
 228         bio->bi_end_io = end_bio_io_page;
 229         bio->bi_private = page;
 230         submit_bio(READ_SYNC | REQ_META, bio);
 231         wait_on_page_locked(page);
 232         bio_put(bio);
 233         if (!PageUptodate(page)) {
 234                 __free_page(page);
 235                 return -EIO;
 236         }
 237         p = kmap(page);
 238         gfs2_sb_in(sdp, p);
 239         kunmap(page);
 240         __free_page(page);
 241         return gfs2_check_sb(sdp, silent);
 242 }
 243
 244 /**
 245  * gfs2_read_sb - Read super block
 246  * @sdp: The GFS2 superblock
 247  * @silent: Don't print message if mount fails
 248  *
 249  */
 250
 251 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 252 {
 253         u32 hash_blocks, ind_blocks, leaf_blocks;
 254         u32 tmp_blocks;
 255         unsigned int x;
 256         int error;
 257
 258         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 259         if (error) {
 260                 if (!silent)
 261                         fs_err(sdp, "can't read superblock\n");
 262                 return error;
 263         }
 264
 265         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 266                                GFS2_BASIC_BLOCK_SHIFT;
 267         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 268         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 269                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 270         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 271                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 272         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 273         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 274         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 275         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 276         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 277                                 sizeof(struct gfs2_meta_header)) /
 278                                 sizeof(struct gfs2_quota_change);
 279         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 280                                      sizeof(struct gfs2_meta_header))
 281                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 282
 283         /* Compute maximum reservation required to add a entry to a directory */
 284
 285         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 286                              sdp->sd_jbsize);
 287
 288         ind_blocks = 0;
 289         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 290                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 291                 ind_blocks += tmp_blocks;
 292         }
 293
 294         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 295
 296         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 297
 298         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 299                                 sizeof(struct gfs2_dinode);
 300         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 301         for (x = 2;; x++) {
 302                 u64 space, d;
 303                 u32 m;
 304
 305                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 306                 d = space;
 307                 m = do_div(d, sdp->sd_inptrs);
 308
 309                 if (d != sdp->sd_heightsize[x - 1] || m)
 310                         break;
 311                 sdp->sd_heightsize[x] = space;
 312         }
 313         sdp->sd_max_height = x;
 314         sdp->sd_heightsize[x] = ~0;
 315         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 316
 317         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 318                                  sizeof(struct gfs2_dinode);
 319         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 320         for (x = 2;; x++) {
 321                 u64 space, d;
 322                 u32 m;
 323
 324                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 325                 d = space;
 326                 m = do_div(d, sdp->sd_inptrs);
 327
 328                 if (d != sdp->sd_jheightsize[x - 1] || m)
 329                         break;
 330                 sdp->sd_jheightsize[x] = space;
 331         }
 332         sdp->sd_max_jheight = x;
 333         sdp->sd_jheightsize[x] = ~0;
 334         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 335
 336         return 0;
 337 }
 338
 339 static int init_names(struct gfs2_sbd *sdp, int silent)
 340 {
 341         char *proto, *table;
 342         int error = 0;
 343
 344         proto = sdp->sd_args.ar_lockproto;
 345         table = sdp->sd_args.ar_locktable;
 346
 347         /*  Try to autodetect  */
 348
 349         if (!proto[0] || !table[0]) {
 350                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 351                 if (error)
 352                         return error;
 353
 354                 if (!proto[0])
 355                         proto = sdp->sd_sb.sb_lockproto;
 356                 if (!table[0])
 357                         table = sdp->sd_sb.sb_locktable;
 358         }
 359
 360         if (!table[0])
 361                 table = sdp->sd_vfs->s_id;
 362
 363         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 364         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 365
 366         table = sdp->sd_table_name;
 367         while ((table = strchr(table, '/')))
 368                 *table = '_';
 369
 370         return error;
 371 }
 372
 373 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 374                         int undo)
 375 {
 376         int error = 0;
 377
 378         if (undo)
 379                 goto fail_trans;
 380
 381         error = gfs2_glock_nq_num(sdp,
 382                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 383                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 384                                   mount_gh);
 385         if (error) {
 386                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 387                 goto fail;
 388         }
 389
 390         error = gfs2_glock_nq_num(sdp,
 391                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 392                                   LM_ST_SHARED,
 393                                   LM_FLAG_NOEXP | GL_EXACT,
 394                                   &sdp->sd_live_gh);
 395         if (error) {
 396                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 397                 goto fail_mount;
 398         }
 399
 400         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 401                                CREATE, &sdp->sd_rename_gl);
 402         if (error) {
 403                 fs_err(sdp, "can't create rename glock: %d\n", error);
 404                 goto fail_live;
 405         }
 406
 407         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 408                                CREATE, &sdp->sd_trans_gl);
 409         if (error) {
 410                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 411                 goto fail_rename;
 412         }
 413
 414         return 0;
 415
 416 fail_trans:
 417         gfs2_glock_put(sdp->sd_trans_gl);
 418 fail_rename:
 419         gfs2_glock_put(sdp->sd_rename_gl);
 420 fail_live:
 421         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 422 fail_mount:
 423         gfs2_glock_dq_uninit(mount_gh);
 424 fail:
 425         return error;
 426 }
 427
 428 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 429                             u64 no_addr, const char *name)
 430 {
 431         struct gfs2_sbd *sdp = sb->s_fs_info;
 432         struct dentry *dentry;
 433         struct inode *inode;
 434
 435         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 436         if (IS_ERR(inode)) {
 437                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 438                 return PTR_ERR(inode);
 439         }
 440         dentry = d_make_root(inode);
 441         if (!dentry) {
 442                 fs_err(sdp, "can't alloc %s dentry\n", name);
 443                 return -ENOMEM;
 444         }
 445         *dptr = dentry;
 446         return 0;
 447 }
 448
 449 static int init_sb(struct gfs2_sbd *sdp, int silent)
 450 {
 451         struct super_block *sb = sdp->sd_vfs;
 452         struct gfs2_holder sb_gh;
 453         u64 no_addr;
 454         int ret;
 455
 456         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 457                                 LM_ST_SHARED, 0, &sb_gh);
 458         if (ret) {
 459                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 460                 return ret;
 461         }
 462
 463         ret = gfs2_read_sb(sdp, silent);
 464         if (ret) {
 465                 fs_err(sdp, "can't read superblock: %d\n", ret);
 466                 goto out;
 467         }
 468
 469         /* Set up the buffer cache and SB for real */
 470         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 471                 ret = -EINVAL;
 472                 fs_err(sdp, "FS block size (%u) is too small for device "
 473                        "block size (%u)\n",
 474                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 475                 goto out;
 476         }
 477         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 478                 ret = -EINVAL;
 479                 fs_err(sdp, "FS block size (%u) is too big for machine "
 480                        "page size (%u)\n",
 481                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 482                 goto out;
 483         }
 484         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 485
 486         /* Get the root inode */
 487         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 488         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 489         if (ret)
 490                 goto out;
 491
 492         /* Get the master inode */
 493         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 494         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 495         if (ret) {
 496                 dput(sdp->sd_root_dir);
 497                 goto out;
 498         }
 499         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 500 out:
 501         gfs2_glock_dq_uninit(&sb_gh);
 502         return ret;
 503 }
 504
 505 /**
 506  * map_journal_extents - create a reusable "extent" mapping from all logical
 507  * blocks to all physical blocks for the given journal.  This will save
 508  * us time when writing journal blocks.  Most journals will have only one
 509  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 510  * arranges the journal blocks sequentially to maximize performance.
 511  * So the extent would map the first block for the entire file length.
 512  * However, gfs2_jadd can happen while file activity is happening, so
 513  * those journals may not be sequential.  Less likely is the case where
 514  * the users created their own journals by mounting the metafs and
 515  * laying it out.  But it's still possible.  These journals might have
 516  * several extents.
 517  *
 518  * TODO: This should be done in bigger chunks rather than one block at a time,
 519  *       but since it's only done at mount time, I'm not worried about the
 520  *       time it takes.
 521  */
 522 static int map_journal_extents(struct gfs2_sbd *sdp)
 523 {
 524         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 525         unsigned int lb;
 526         u64 db, prev_db; /* logical block, disk block, prev disk block */
 527         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 528         struct gfs2_journal_extent *jext = NULL;
 529         struct buffer_head bh;
 530         int rc = 0;
 531
 532         prev_db = 0;
 533
 534         for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
 535                 bh.b_state = 0;
 536                 bh.b_blocknr = 0;
 537                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 538                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 539                 db = bh.b_blocknr;
 540                 if (rc || !db) {
 541                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 542                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 543                         break;
 544                 }
 545                 if (!prev_db || db != prev_db + 1) {
 546                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 547                                        GFP_KERNEL);
 548                         if (!jext) {
 549                                 printk(KERN_INFO "GFS2 error: out of memory "
 550                                        "mapping journal extents.\n");
 551                                 rc = -ENOMEM;
 552                                 break;
 553                         }
 554                         jext->dblock = db;
 555                         jext->lblock = lb;
 556                         jext->blocks = 1;
 557                         list_add_tail(&jext->extent_list, &jd->extent_list);
 558                 } else {
 559                         jext->blocks++;
 560                 }
 561                 prev_db = db;
 562         }
 563         return rc;
 564 }
 565
 566 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 567 {
 568         char *message = "FIRSTMOUNT=Done";
 569         char *envp[] = { message, NULL };
 570
 571         fs_info(sdp, "first mount done, others may mount\n");
 572
 573         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 574                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 575
 576         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 577 }
 578
 579 /**
 580  * gfs2_jindex_hold - Grab a lock on the jindex
 581  * @sdp: The GFS2 superblock
 582  * @ji_gh: the holder for the jindex glock
 583  *
 584  * Returns: errno
 585  */
 586
 587 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 588 {
 589         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 590         struct qstr name;
 591         char buf[20];
 592         struct gfs2_jdesc *jd;
 593         int error;
 594
 595         name.name = buf;
 596
 597         mutex_lock(&sdp->sd_jindex_mutex);
 598
 599         for (;;) {
 600                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 601                 if (error)
 602                         break;
 603
 604                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 605                 name.hash = gfs2_disk_hash(name.name, name.len);
 606
 607                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 608                 if (error == -ENOENT) {
 609                         error = 0;
 610                         break;
 611                 }
 612
 613                 gfs2_glock_dq_uninit(ji_gh);
 614
 615                 if (error)
 616                         break;
 617
 618                 error = -ENOMEM;
 619                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 620                 if (!jd)
 621                         break;
 622
 623                 INIT_LIST_HEAD(&jd->extent_list);
 624                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 625                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 626                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 627                         if (!jd->jd_inode)
 628                                 error = -ENOENT;
 629                         else
 630                                 error = PTR_ERR(jd->jd_inode);
 631                         kfree(jd);
 632                         break;
 633                 }
 634
 635                 spin_lock(&sdp->sd_jindex_spin);
 636                 jd->jd_jid = sdp->sd_journals++;
 637                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 638                 spin_unlock(&sdp->sd_jindex_spin);
 639         }
 640
 641         mutex_unlock(&sdp->sd_jindex_mutex);
 642
 643         return error;
 644 }
 645
 646 static int init_journal(struct gfs2_sbd *sdp, int undo)
 647 {
 648         struct inode *master = sdp->sd_master_dir->d_inode;
 649         struct gfs2_holder ji_gh;
 650         struct gfs2_inode *ip;
 651         int jindex = 1;
 652         int error = 0;
 653
 654         if (undo) {
 655                 jindex = 0;
 656                 goto fail_jinode_gh;
 657         }
 658
 659         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 660         if (IS_ERR(sdp->sd_jindex)) {
 661                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 662                 return PTR_ERR(sdp->sd_jindex);
 663         }
 664
 665         /* Load in the journal index special file */
 666
 667         error = gfs2_jindex_hold(sdp, &ji_gh);
 668         if (error) {
 669                 fs_err(sdp, "can't read journal index: %d\n", error);
 670                 goto fail;
 671         }
 672
 673         error = -EUSERS;
 674         if (!gfs2_jindex_size(sdp)) {
 675                 fs_err(sdp, "no journals!\n");
 676                 goto fail_jindex;
 677         }
 678
 679         if (sdp->sd_args.ar_spectator) {
 680                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 681                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 682                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 683                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 684         } else {
 685                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 686                         fs_err(sdp, "can't mount journal #%u\n",
 687                                sdp->sd_lockstruct.ls_jid);
 688                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 689                                gfs2_jindex_size(sdp),
 690                                gfs2_jindex_size(sdp) - 1);
 691                         goto fail_jindex;
 692                 }
 693                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 694
 695                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 696                                           &gfs2_journal_glops,
 697                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 698                                           &sdp->sd_journal_gh);
 699                 if (error) {
 700                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 701                         goto fail_jindex;
 702                 }
 703
 704                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 705                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 706                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 707                                            &sdp->sd_jinode_gh);
 708                 if (error) {
 709                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 710                                error);
 711                         goto fail_journal_gh;
 712                 }
 713
 714                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 715                 if (error) {
 716                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 717                                sdp->sd_jdesc->jd_jid, error);
 718                         goto fail_jinode_gh;
 719                 }
 720                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 721                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 722                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 723
 724                 /* Map the extents for this journal's blocks */
 725                 map_journal_extents(sdp);
 726         }
 727         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 728
 729         if (sdp->sd_lockstruct.ls_first) {
 730                 unsigned int x;
 731                 for (x = 0; x < sdp->sd_journals; x++) {
 732                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
 733                                                      true);
 734                         if (error) {
 735                                 fs_err(sdp, "error recovering journal %u: %d\n",
 736                                        x, error);
 737                                 goto fail_jinode_gh;
 738                         }
 739                 }
 740
 741                 gfs2_others_may_mount(sdp);
 742         } else if (!sdp->sd_args.ar_spectator) {
 743                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 744                 if (error) {
 745                         fs_err(sdp, "error recovering my journal: %d\n", error);
 746                         goto fail_jinode_gh;
 747                 }
 748         }
 749
 750         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 751         gfs2_glock_dq_uninit(&ji_gh);
 752         jindex = 0;
 753
 754         return 0;
 755
 756 fail_jinode_gh:
 757         if (!sdp->sd_args.ar_spectator)
 758                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 759 fail_journal_gh:
 760         if (!sdp->sd_args.ar_spectator)
 761                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 762 fail_jindex:
 763         gfs2_jindex_free(sdp);
 764         if (jindex)
 765                 gfs2_glock_dq_uninit(&ji_gh);
 766 fail:
 767         iput(sdp->sd_jindex);
 768         return error;
 769 }
 770
 771 static struct lock_class_key gfs2_quota_imutex_key;
 772
 773 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 774 {
 775         int error = 0;
 776         struct inode *master = sdp->sd_master_dir->d_inode;
 777
 778         if (undo)
 779                 goto fail_qinode;
 780
 781         error = init_journal(sdp, undo);
 782         if (error)
 783                 goto fail;
 784
 785         /* Read in the master statfs inode */
 786         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 787         if (IS_ERR(sdp->sd_statfs_inode)) {
 788                 error = PTR_ERR(sdp->sd_statfs_inode);
 789                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 790                 goto fail_journal;
 791         }
 792
 793         /* Read in the resource index inode */
 794         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 795         if (IS_ERR(sdp->sd_rindex)) {
 796                 error = PTR_ERR(sdp->sd_rindex);
 797                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 798                 goto fail_statfs;
 799         }
 800         sdp->sd_rindex_uptodate = 0;
 801
 802         /* Read in the quota inode */
 803         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 804         if (IS_ERR(sdp->sd_quota_inode)) {
 805                 error = PTR_ERR(sdp->sd_quota_inode);
 806                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 807                 goto fail_rindex;
 808         }
 809         /*
 810          * i_mutex on quota files is special. Since this inode is hidden system
 811          * file, we are safe to define locking ourselves.
 812          */
 813         lockdep_set_class(&sdp->sd_quota_inode->i_mutex,
 814                           &gfs2_quota_imutex_key);
 815
 816         error = gfs2_rindex_update(sdp);
 817         if (error)
 818                 goto fail_qinode;
 819
 820         return 0;
 821
 822 fail_qinode:
 823         iput(sdp->sd_quota_inode);
 824 fail_rindex:
 825         gfs2_clear_rgrpd(sdp);
 826         iput(sdp->sd_rindex);
 827 fail_statfs:
 828         iput(sdp->sd_statfs_inode);
 829 fail_journal:
 830         init_journal(sdp, UNDO);
 831 fail:
 832         return error;
 833 }
 834
 835 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 836 {
 837         struct inode *pn = NULL;
 838         char buf[30];
 839         int error = 0;
 840         struct gfs2_inode *ip;
 841         struct inode *master = sdp->sd_master_dir->d_inode;
 842
 843         if (sdp->sd_args.ar_spectator)
 844                 return 0;
 845
 846         if (undo)
 847                 goto fail_qc_gh;
 848
 849         pn = gfs2_lookup_simple(master, "per_node");
 850         if (IS_ERR(pn)) {
 851                 error = PTR_ERR(pn);
 852                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 853                 return error;
 854         }
 855
 856         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 857         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 858         if (IS_ERR(sdp->sd_sc_inode)) {
 859                 error = PTR_ERR(sdp->sd_sc_inode);
 860                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 861                 goto fail;
 862         }
 863
 864         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 865         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 866         if (IS_ERR(sdp->sd_qc_inode)) {
 867                 error = PTR_ERR(sdp->sd_qc_inode);
 868                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 869                 goto fail_ut_i;
 870         }
 871
 872         iput(pn);
 873         pn = NULL;
 874
 875         ip = GFS2_I(sdp->sd_sc_inode);
 876         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 877                                    &sdp->sd_sc_gh);
 878         if (error) {
 879                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 880                 goto fail_qc_i;
 881         }
 882
 883         ip = GFS2_I(sdp->sd_qc_inode);
 884         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 885                                    &sdp->sd_qc_gh);
 886         if (error) {
 887                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 888                 goto fail_ut_gh;
 889         }
 890
 891         return 0;
 892
 893 fail_qc_gh:
 894         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 895 fail_ut_gh:
 896         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 897 fail_qc_i:
 898         iput(sdp->sd_qc_inode);
 899 fail_ut_i:
 900         iput(sdp->sd_sc_inode);
 901 fail:
 902         if (pn)
 903                 iput(pn);
 904         return error;
 905 }
 906
 907 static int init_threads(struct gfs2_sbd *sdp, int undo)
 908 {
 909         struct task_struct *p;
 910         int error = 0;
 911
 912         if (undo)
 913                 goto fail_quotad;
 914
 915         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 916         error = IS_ERR(p);
 917         if (error) {
 918                 fs_err(sdp, "can't start logd thread: %d\n", error);
 919                 return error;
 920         }
 921         sdp->sd_logd_process = p;
 922
 923         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 924         error = IS_ERR(p);
 925         if (error) {
 926                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 927                 goto fail;
 928         }
 929         sdp->sd_quotad_process = p;
 930
 931         return 0;
 932
 933
 934 fail_quotad:
 935         kthread_stop(sdp->sd_quotad_process);
 936 fail:
 937         kthread_stop(sdp->sd_logd_process);
 938         return error;
 939 }
 940
 941 static const match_table_t nolock_tokens = {
 942         { Opt_jid, "jid=%d\n", },
 943         { Opt_err, NULL },
 944 };
 945
 946 static const struct lm_lockops nolock_ops = {
 947         .lm_proto_name = "lock_nolock",
 948         .lm_put_lock = gfs2_glock_free,
 949         .lm_tokens = &nolock_tokens,
 950 };
 951
 952 /**
 953  * gfs2_lm_mount - mount a locking protocol
 954  * @sdp: the filesystem
 955  * @args: mount arguments
 956  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 957  *
 958  * Returns: errno
 959  */
 960
 961 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 962 {
 963         const struct lm_lockops *lm;
 964         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 965         struct gfs2_args *args = &sdp->sd_args;
 966         const char *proto = sdp->sd_proto_name;
 967         const char *table = sdp->sd_table_name;
 968         char *o, *options;
 969         int ret;
 970
 971         if (!strcmp("lock_nolock", proto)) {
 972                 lm = &nolock_ops;
 973                 sdp->sd_args.ar_localflocks = 1;
 974 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 975         } else if (!strcmp("lock_dlm", proto)) {
 976                 lm = &gfs2_dlm_ops;
 977 #endif
 978         } else {
 979                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
 980                 return -ENOENT;
 981         }
 982
 983         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 984
 985         ls->ls_ops = lm;
 986         ls->ls_first = 1;
 987
 988         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 989                 substring_t tmp[MAX_OPT_ARGS];
 990                 int token, option;
 991
 992                 if (!o || !*o)
 993                         continue;
 994
 995                 token = match_token(o, *lm->lm_tokens, tmp);
 996                 switch (token) {
 997                 case Opt_jid:
 998                         ret = match_int(&tmp[0], &option);
 999                         if (ret || option < 0)
1000                                 goto hostdata_error;
1001                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1002                                 ls->ls_jid = option;
1003                         break;
1004                 case Opt_id:
1005                 case Opt_nodir:
1006                         /* Obsolete, but left for backward compat purposes */
1007                         break;
1008                 case Opt_first:
1009                         ret = match_int(&tmp[0], &option);
1010                         if (ret || (option != 0 && option != 1))
1011                                 goto hostdata_error;
1012                         ls->ls_first = option;
1013                         break;
1014                 case Opt_err:
1015                 default:
1016 hostdata_error:
1017                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1018                         return -EINVAL;
1019                 }
1020         }
1021
1022         if (lm->lm_mount == NULL) {
1023                 fs_info(sdp, "Now mounting FS...\n");
1024                 complete_all(&sdp->sd_locking_init);
1025                 return 0;
1026         }
1027         ret = lm->lm_mount(sdp, table);
1028         if (ret == 0)
1029                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1030         complete_all(&sdp->sd_locking_init);
1031         return ret;
1032 }
1033
1034 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1035 {
1036         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1037         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1038             lm->lm_unmount)
1039                 lm->lm_unmount(sdp);
1040 }
1041
1042 static int gfs2_journalid_wait(void *word)
1043 {
1044         if (signal_pending(current))
1045                 return -EINTR;
1046         schedule();
1047         return 0;
1048 }
1049
1050 static int wait_on_journal(struct gfs2_sbd *sdp)
1051 {
1052         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1053                 return 0;
1054
1055         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1056 }
1057
1058 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1059 {
1060         struct super_block *sb = sdp->sd_vfs;
1061         char ro[20];
1062         char spectator[20];
1063         char *envp[] = { ro, spectator, NULL };
1064         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1065         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1066         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1067 }
1068
1069 /**
1070  * fill_super - Read in superblock
1071  * @sb: The VFS superblock
1072  * @data: Mount options
1073  * @silent: Don't complain if it's not a GFS2 filesystem
1074  *
1075  * Returns: errno
1076  */
1077
1078 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1079 {
1080         struct gfs2_sbd *sdp;
1081         struct gfs2_holder mount_gh;
1082         int error;
1083
1084         sdp = init_sbd(sb);
1085         if (!sdp) {
1086                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1087                 return -ENOMEM;
1088         }
1089         sdp->sd_args = *args;
1090
1091         if (sdp->sd_args.ar_spectator) {
1092                 sb->s_flags |= MS_RDONLY;
1093                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1094         }
1095         if (sdp->sd_args.ar_posix_acl)
1096                 sb->s_flags |= MS_POSIXACL;
1097         if (sdp->sd_args.ar_nobarrier)
1098                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1099
1100         sb->s_flags |= MS_NOSEC;
1101         sb->s_magic = GFS2_MAGIC;
1102         sb->s_op = &gfs2_super_ops;
1103         sb->s_d_op = &gfs2_dops;
1104         sb->s_export_op = &gfs2_export_ops;
1105         sb->s_xattr = gfs2_xattr_handlers;
1106         sb->s_qcop = &gfs2_quotactl_ops;
1107         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1108         sb->s_time_gran = 1;
1109         sb->s_maxbytes = MAX_LFS_FILESIZE;
1110
1111         /* Set up the buffer cache and fill in some fake block size values
1112            to allow us to read-in the on-disk superblock. */
1113         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1114         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1115         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1116                                GFS2_BASIC_BLOCK_SHIFT;
1117         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1118
1119         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1120         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1121         if (sdp->sd_args.ar_statfs_quantum) {
1122                 sdp->sd_tune.gt_statfs_slow = 0;
1123                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1124         } else {
1125                 sdp->sd_tune.gt_statfs_slow = 1;
1126                 sdp->sd_tune.gt_statfs_quantum = 30;
1127         }
1128
1129         error = init_names(sdp, silent);
1130         if (error) {
1131                 /* In this case, we haven't initialized sysfs, so we have to
1132                    manually free the sdp. */
1133                 free_percpu(sdp->sd_lkstats);
1134                 kfree(sdp);
1135                 sb->s_fs_info = NULL;
1136                 return error;
1137         }
1138
1139         snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1140
1141         error = gfs2_sys_fs_add(sdp);
1142         /*
1143          * If we hit an error here, gfs2_sys_fs_add will have called function
1144          * kobject_put which causes the sysfs usage count to go to zero, which
1145          * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1146          * Subsequent error paths here will call gfs2_sys_fs_del, which also
1147          * kobject_put to free sdp.
1148          */
1149         if (error)
1150                 return error;
1151
1152         gfs2_create_debugfs_file(sdp);
1153
1154         error = gfs2_lm_mount(sdp, silent);
1155         if (error)
1156                 goto fail_debug;
1157
1158         error = init_locking(sdp, &mount_gh, DO);
1159         if (error)
1160                 goto fail_lm;
1161
1162         error = init_sb(sdp, silent);
1163         if (error)
1164                 goto fail_locking;
1165
1166         error = wait_on_journal(sdp);
1167         if (error)
1168                 goto fail_sb;
1169
1170         /*
1171          * If user space has failed to join the cluster or some similar
1172          * failure has occurred, then the journal id will contain a
1173          * negative (error) number. This will then be returned to the
1174          * caller (of the mount syscall). We do this even for spectator
1175          * mounts (which just write a jid of 0 to indicate "ok" even though
1176          * the jid is unused in the spectator case)
1177          */
1178         if (sdp->sd_lockstruct.ls_jid < 0) {
1179                 error = sdp->sd_lockstruct.ls_jid;
1180                 sdp->sd_lockstruct.ls_jid = 0;
1181                 goto fail_sb;
1182         }
1183
1184         if (sdp->sd_args.ar_spectator)
1185                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1186                          sdp->sd_table_name);
1187         else
1188                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1189                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1190
1191         error = init_inodes(sdp, DO);
1192         if (error)
1193                 goto fail_sb;
1194
1195         error = init_per_node(sdp, DO);
1196         if (error)
1197                 goto fail_inodes;
1198
1199         error = gfs2_statfs_init(sdp);
1200         if (error) {
1201                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1202                 goto fail_per_node;
1203         }
1204
1205         error = init_threads(sdp, DO);
1206         if (error)
1207                 goto fail_per_node;
1208
1209         if (!(sb->s_flags & MS_RDONLY)) {
1210                 error = gfs2_make_fs_rw(sdp);
1211                 if (error) {
1212                         fs_err(sdp, "can't make FS RW: %d\n", error);
1213                         goto fail_threads;
1214                 }
1215         }
1216
1217         gfs2_glock_dq_uninit(&mount_gh);
1218         gfs2_online_uevent(sdp);
1219         return 0;
1220
1221 fail_threads:
1222         init_threads(sdp, UNDO);
1223 fail_per_node:
1224         init_per_node(sdp, UNDO);
1225 fail_inodes:
1226         init_inodes(sdp, UNDO);
1227 fail_sb:
1228         if (sdp->sd_root_dir)
1229                 dput(sdp->sd_root_dir);
1230         if (sdp->sd_master_dir)
1231                 dput(sdp->sd_master_dir);
1232         if (sb->s_root)
1233                 dput(sb->s_root);
1234         sb->s_root = NULL;
1235 fail_locking:
1236         init_locking(sdp, &mount_gh, UNDO);
1237 fail_lm:
1238         gfs2_gl_hash_clear(sdp);
1239         gfs2_lm_unmount(sdp);
1240 fail_debug:
1241         gfs2_delete_debugfs_file(sdp);
1242         free_percpu(sdp->sd_lkstats);
1243         /* gfs2_sys_fs_del must be the last thing we do, since it causes
1244          * sysfs to call function gfs2_sbd_release, which frees sdp. */
1245         gfs2_sys_fs_del(sdp);
1246         sb->s_fs_info = NULL;
1247         return error;
1248 }
1249
1250 static int set_gfs2_super(struct super_block *s, void *data)
1251 {
1252         s->s_bdev = data;
1253         s->s_dev = s->s_bdev->bd_dev;
1254
1255         /*
1256          * We set the bdi here to the queue backing, file systems can
1257          * overwrite this in ->fill_super()
1258          */
1259         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1260         return 0;
1261 }
1262
1263 static int test_gfs2_super(struct super_block *s, void *ptr)
1264 {
1265         struct block_device *bdev = ptr;
1266         return (bdev == s->s_bdev);
1267 }
1268
1269 /**
1270  * gfs2_mount - Get the GFS2 superblock
1271  * @fs_type: The GFS2 filesystem type
1272  * @flags: Mount flags
1273  * @dev_name: The name of the device
1274  * @data: The mount arguments
1275  *
1276  * Q. Why not use get_sb_bdev() ?
1277  * A. We need to select one of two root directories to mount, independent
1278  *    of whether this is the initial, or subsequent, mount of this sb
1279  *
1280  * Returns: 0 or -ve on error
1281  */
1282
1283 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1284                        const char *dev_name, void *data)
1285 {
1286         struct block_device *bdev;
1287         struct super_block *s;
1288         fmode_t mode = FMODE_READ | FMODE_EXCL;
1289         int error;
1290         struct gfs2_args args;
1291         struct gfs2_sbd *sdp;
1292
1293         if (!(flags & MS_RDONLY))
1294                 mode |= FMODE_WRITE;
1295
1296         bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1297         if (IS_ERR(bdev))
1298                 return ERR_CAST(bdev);
1299
1300         /*
1301          * once the super is inserted into the list by sget, s_umount
1302          * will protect the lockfs code from trying to start a snapshot
1303          * while we are mounting
1304          */
1305         mutex_lock(&bdev->bd_fsfreeze_mutex);
1306         if (bdev->bd_fsfreeze_count > 0) {
1307                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1308                 error = -EBUSY;
1309                 goto error_bdev;
1310         }
1311         s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1312         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1313         error = PTR_ERR(s);
1314         if (IS_ERR(s))
1315                 goto error_bdev;
1316
1317         if (s->s_root)
1318                 blkdev_put(bdev, mode);
1319
1320         memset(&args, 0, sizeof(args));
1321         args.ar_quota = GFS2_QUOTA_DEFAULT;
1322         args.ar_data = GFS2_DATA_DEFAULT;
1323         args.ar_commit = 30;
1324         args.ar_statfs_quantum = 30;
1325         args.ar_quota_quantum = 60;
1326         args.ar_errors = GFS2_ERRORS_DEFAULT;
1327
1328         error = gfs2_mount_args(&args, data);
1329         if (error) {
1330                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1331                 goto error_super;
1332         }
1333
1334         if (s->s_root) {
1335                 error = -EBUSY;
1336                 if ((flags ^ s->s_flags) & MS_RDONLY)
1337                         goto error_super;
1338         } else {
1339                 char b[BDEVNAME_SIZE];
1340
1341                 s->s_mode = mode;
1342                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1343                 sb_set_blocksize(s, block_size(bdev));
1344                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1345                 if (error)
1346                         goto error_super;
1347                 s->s_flags |= MS_ACTIVE;
1348                 bdev->bd_super = s;
1349         }
1350
1351         sdp = s->s_fs_info;
1352         if (args.ar_meta)
1353                 return dget(sdp->sd_master_dir);
1354         else
1355                 return dget(sdp->sd_root_dir);
1356
1357 error_super:
1358         deactivate_locked_super(s);
1359         return ERR_PTR(error);
1360 error_bdev:
1361         blkdev_put(bdev, mode);
1362         return ERR_PTR(error);
1363 }
1364
1365 static int set_meta_super(struct super_block *s, void *ptr)
1366 {
1367         return -EINVAL;
1368 }
1369
1370 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1371                         int flags, const char *dev_name, void *data)
1372 {
1373         struct super_block *s;
1374         struct gfs2_sbd *sdp;
1375         struct path path;
1376         int error;
1377
1378         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1379         if (error) {
1380                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1381                        dev_name, error);
1382                 return ERR_PTR(error);
1383         }
1384         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1385                  path.dentry->d_inode->i_sb->s_bdev);
1386         path_put(&path);
1387         if (IS_ERR(s)) {
1388                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1389                 return ERR_CAST(s);
1390         }
1391         if ((flags ^ s->s_flags) & MS_RDONLY) {
1392                 deactivate_locked_super(s);
1393                 return ERR_PTR(-EBUSY);
1394         }
1395         sdp = s->s_fs_info;
1396         return dget(sdp->sd_master_dir);
1397 }
1398
1399 static void gfs2_kill_sb(struct super_block *sb)
1400 {
1401         struct gfs2_sbd *sdp = sb->s_fs_info;
1402
1403         if (sdp == NULL) {
1404                 kill_block_super(sb);
1405                 return;
1406         }
1407
1408         gfs2_meta_syncfs(sdp);
1409         dput(sdp->sd_root_dir);
1410         dput(sdp->sd_master_dir);
1411         sdp->sd_root_dir = NULL;
1412         sdp->sd_master_dir = NULL;
1413         shrink_dcache_sb(sb);
1414         gfs2_delete_debugfs_file(sdp);
1415         free_percpu(sdp->sd_lkstats);
1416         kill_block_super(sb);
1417 }
1418
1419 struct file_system_type gfs2_fs_type = {
1420         .name = "gfs2",
1421         .fs_flags = FS_REQUIRES_DEV,
1422         .mount = gfs2_mount,
1423         .kill_sb = gfs2_kill_sb,
1424         .owner = THIS_MODULE,
1425 };
1426
1427 struct file_system_type gfs2meta_fs_type = {
1428         .name = "gfs2meta",
1429         .fs_flags = FS_REQUIRES_DEV,
1430         .mount = gfs2_mount_meta,
1431         .owner = THIS_MODULE,
1432 };
1433