2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <asm/uaccess.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_eh.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
65 MODULE_AUTHOR("Eric Youngdale");
66 MODULE_DESCRIPTION("SCSI disk (sd) driver");
67 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
89 static DEFINE_IDR(sd_index_idr);
90 static DEFINE_SPINLOCK(sd_index_lock);
92 /* This semaphore is used to mediate the 0->1 reference get in the
93 * face of object destruction (i.e. we can't allow a get on an
94 * object after last put) */
95 static DEFINE_MUTEX(sd_ref_mutex);
97 static const char *sd_cache_types[] = {
98 "write through", "none", "write back",
99 "write back, no read (daft)"
102 static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
105 int i, ct = -1, rcd, wce, sp;
106 struct scsi_disk *sdkp = to_scsi_disk(cdev);
107 struct scsi_device *sdp = sdkp->device;
110 struct scsi_mode_data data;
111 struct scsi_sense_hdr sshdr;
114 if (sdp->type != TYPE_DISK)
115 /* no cache control on RBC devices; theoretically they
116 * can do it, but there's probably so many exceptions
117 * it's not worth the risk */
120 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
121 const int len = strlen(sd_cache_types[i]);
122 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
130 rcd = ct & 0x01 ? 1 : 0;
131 wce = ct & 0x02 ? 1 : 0;
132 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
133 SD_MAX_RETRIES, &data, NULL))
135 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
136 data.block_descriptor_length);
137 buffer_data = buffer + data.header_length +
138 data.block_descriptor_length;
139 buffer_data[2] &= ~0x05;
140 buffer_data[2] |= wce << 2 | rcd;
141 sp = buffer_data[0] & 0x80 ? 1 : 0;
143 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
144 SD_MAX_RETRIES, &data, &sshdr)) {
145 if (scsi_sense_valid(&sshdr))
146 sd_print_sense_hdr(sdkp, &sshdr);
149 sd_revalidate_disk(sdkp->disk);
153 static ssize_t sd_store_manage_start_stop(struct class_device *cdev,
154 const char *buf, size_t count)
156 struct scsi_disk *sdkp = to_scsi_disk(cdev);
157 struct scsi_device *sdp = sdkp->device;
159 if (!capable(CAP_SYS_ADMIN))
162 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
167 static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
170 struct scsi_disk *sdkp = to_scsi_disk(cdev);
171 struct scsi_device *sdp = sdkp->device;
173 if (!capable(CAP_SYS_ADMIN))
176 if (sdp->type != TYPE_DISK)
179 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
184 static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
186 struct scsi_disk *sdkp = to_scsi_disk(cdev);
187 int ct = sdkp->RCD + 2*sdkp->WCE;
189 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
192 static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
194 struct scsi_disk *sdkp = to_scsi_disk(cdev);
196 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
199 static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf)
201 struct scsi_disk *sdkp = to_scsi_disk(cdev);
202 struct scsi_device *sdp = sdkp->device;
204 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
207 static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
209 struct scsi_disk *sdkp = to_scsi_disk(cdev);
211 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
214 static struct class_device_attribute sd_disk_attrs[] = {
215 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
216 sd_store_cache_type),
217 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
218 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
219 sd_store_allow_restart),
220 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
221 sd_store_manage_start_stop),
225 static struct class sd_disk_class = {
227 .owner = THIS_MODULE,
228 .release = scsi_disk_release,
229 .class_dev_attrs = sd_disk_attrs,
232 static struct scsi_driver sd_template = {
233 .owner = THIS_MODULE,
238 .suspend = sd_suspend,
240 .shutdown = sd_shutdown,
246 * Device no to disk mapping:
248 * major disc2 disc p1
249 * |............|.............|....|....| <- dev_t
252 * Inside a major, we have 16k disks, however mapped non-
253 * contiguously. The first 16 disks are for major0, the next
254 * ones with major1, ... Disk 256 is for major0 again, disk 272
256 * As we stay compatible with our numbering scheme, we can reuse
257 * the well-know SCSI majors 8, 65--71, 136--143.
259 static int sd_major(int major_idx)
263 return SCSI_DISK0_MAJOR;
265 return SCSI_DISK1_MAJOR + major_idx - 1;
267 return SCSI_DISK8_MAJOR + major_idx - 8;
270 return 0; /* shut up gcc */
274 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
276 return container_of(disk->private_data, struct scsi_disk, driver);
279 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
281 struct scsi_disk *sdkp = NULL;
283 if (disk->private_data) {
284 sdkp = scsi_disk(disk);
285 if (scsi_device_get(sdkp->device) == 0)
286 class_device_get(&sdkp->cdev);
293 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
295 struct scsi_disk *sdkp;
297 mutex_lock(&sd_ref_mutex);
298 sdkp = __scsi_disk_get(disk);
299 mutex_unlock(&sd_ref_mutex);
303 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
305 struct scsi_disk *sdkp;
307 mutex_lock(&sd_ref_mutex);
308 sdkp = dev_get_drvdata(dev);
310 sdkp = __scsi_disk_get(sdkp->disk);
311 mutex_unlock(&sd_ref_mutex);
315 static void scsi_disk_put(struct scsi_disk *sdkp)
317 struct scsi_device *sdev = sdkp->device;
319 mutex_lock(&sd_ref_mutex);
320 class_device_put(&sdkp->cdev);
321 scsi_device_put(sdev);
322 mutex_unlock(&sd_ref_mutex);
326 * sd_init_command - build a scsi (read or write) command from
327 * information in the request structure.
328 * @SCpnt: pointer to mid-level's per scsi command structure that
329 * contains request and into which the scsi command is written
331 * Returns 1 if successful and 0 if error (or cannot be done now).
333 static int sd_prep_fn(struct request_queue *q, struct request *rq)
335 struct scsi_cmnd *SCpnt;
336 struct scsi_device *sdp = q->queuedata;
337 struct gendisk *disk = rq->rq_disk;
338 sector_t block = rq->sector;
339 unsigned int this_count = rq->nr_sectors;
340 unsigned int timeout = sdp->timeout;
343 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
344 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
346 } else if (rq->cmd_type != REQ_TYPE_FS) {
350 ret = scsi_setup_fs_cmnd(sdp, rq);
351 if (ret != BLKPREP_OK)
355 /* from here on until we're complete, any goto out
356 * is used for a killable error condition */
359 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
360 "sd_init_command: block=%llu, "
362 (unsigned long long)block,
365 if (!sdp || !scsi_device_online(sdp) ||
366 block + rq->nr_sectors > get_capacity(disk)) {
367 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
368 "Finishing %ld sectors\n",
370 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
371 "Retry with 0x%p\n", SCpnt));
377 * quietly refuse to do anything to a changed disc until
378 * the changed bit has been reset
380 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
384 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
385 (unsigned long long)block));
388 * If we have a 1K hardware sectorsize, prevent access to single
389 * 512 byte sectors. In theory we could handle this - in fact
390 * the scsi cdrom driver must be able to handle this because
391 * we typically use 1K blocksizes, and cdroms typically have
392 * 2K hardware sectorsizes. Of course, things are simpler
393 * with the cdrom, since it is read-only. For performance
394 * reasons, the filesystems should be able to handle this
395 * and not force the scsi disk driver to use bounce buffers
398 if (sdp->sector_size == 1024) {
399 if ((block & 1) || (rq->nr_sectors & 1)) {
400 scmd_printk(KERN_ERR, SCpnt,
401 "Bad block number requested\n");
405 this_count = this_count >> 1;
408 if (sdp->sector_size == 2048) {
409 if ((block & 3) || (rq->nr_sectors & 3)) {
410 scmd_printk(KERN_ERR, SCpnt,
411 "Bad block number requested\n");
415 this_count = this_count >> 2;
418 if (sdp->sector_size == 4096) {
419 if ((block & 7) || (rq->nr_sectors & 7)) {
420 scmd_printk(KERN_ERR, SCpnt,
421 "Bad block number requested\n");
425 this_count = this_count >> 3;
428 if (rq_data_dir(rq) == WRITE) {
429 if (!sdp->writeable) {
432 SCpnt->cmnd[0] = WRITE_6;
433 SCpnt->sc_data_direction = DMA_TO_DEVICE;
434 } else if (rq_data_dir(rq) == READ) {
435 SCpnt->cmnd[0] = READ_6;
436 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
438 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
442 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
443 "%s %d/%ld 512 byte blocks.\n",
444 (rq_data_dir(rq) == WRITE) ?
445 "writing" : "reading", this_count,
450 if (block > 0xffffffff) {
451 SCpnt->cmnd[0] += READ_16 - READ_6;
452 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
453 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
454 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
455 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
456 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
457 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
458 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
459 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
460 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
461 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
462 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
463 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
464 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
465 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
466 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
467 SCpnt->device->use_10_for_rw) {
468 if (this_count > 0xffff)
471 SCpnt->cmnd[0] += READ_10 - READ_6;
472 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
473 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
474 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
475 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
476 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
477 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
478 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
479 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
481 if (unlikely(blk_fua_rq(rq))) {
483 * This happens only if this drive failed
484 * 10byte rw command with ILLEGAL_REQUEST
485 * during operation and thus turned off
488 scmd_printk(KERN_ERR, SCpnt,
489 "FUA write on READ/WRITE(6) drive\n");
493 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
494 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
495 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
496 SCpnt->cmnd[4] = (unsigned char) this_count;
499 SCpnt->request_bufflen = this_count * sdp->sector_size;
502 * We shouldn't disconnect in the middle of a sector, so with a dumb
503 * host adapter, it's safe to assume that we can at least transfer
504 * this many bytes between each connect / disconnect.
506 SCpnt->transfersize = sdp->sector_size;
507 SCpnt->underflow = this_count << 9;
508 SCpnt->allowed = SD_MAX_RETRIES;
509 SCpnt->timeout_per_command = timeout;
512 * This is the completion routine we use. This is matched in terms
513 * of capability to this function.
515 SCpnt->done = sd_rw_intr;
518 * This indicates that the command is ready from our end to be
523 return scsi_prep_return(q, rq, ret);
527 * sd_open - open a scsi disk device
528 * @inode: only i_rdev member may be used
529 * @filp: only f_mode and f_flags may be used
531 * Returns 0 if successful. Returns a negated errno value in case
534 * Note: This can be called from a user context (e.g. fsck(1) )
535 * or from within the kernel (e.g. as a result of a mount(1) ).
536 * In the latter case @inode and @filp carry an abridged amount
537 * of information as noted above.
539 static int sd_open(struct inode *inode, struct file *filp)
541 struct gendisk *disk = inode->i_bdev->bd_disk;
542 struct scsi_disk *sdkp;
543 struct scsi_device *sdev;
546 if (!(sdkp = scsi_disk_get(disk)))
550 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
555 * If the device is in error recovery, wait until it is done.
556 * If the device is offline, then disallow any access to it.
559 if (!scsi_block_when_processing_errors(sdev))
562 if (sdev->removable || sdkp->write_prot)
563 check_disk_change(inode->i_bdev);
566 * If the drive is empty, just let the open fail.
569 if (sdev->removable && !sdkp->media_present &&
570 !(filp->f_flags & O_NDELAY))
574 * If the device has the write protect tab set, have the open fail
575 * if the user expects to be able to write to the thing.
578 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
582 * It is possible that the disk changing stuff resulted in
583 * the device being taken offline. If this is the case,
584 * report this to the user, and don't pretend that the
585 * open actually succeeded.
588 if (!scsi_device_online(sdev))
591 if (!sdkp->openers++ && sdev->removable) {
592 if (scsi_block_when_processing_errors(sdev))
593 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
604 * sd_release - invoked when the (last) close(2) is called on this
606 * @inode: only i_rdev member may be used
607 * @filp: only f_mode and f_flags may be used
611 * Note: may block (uninterruptible) if error recovery is underway
614 static int sd_release(struct inode *inode, struct file *filp)
616 struct gendisk *disk = inode->i_bdev->bd_disk;
617 struct scsi_disk *sdkp = scsi_disk(disk);
618 struct scsi_device *sdev = sdkp->device;
620 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
622 if (!--sdkp->openers && sdev->removable) {
623 if (scsi_block_when_processing_errors(sdev))
624 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
628 * XXX and what if there are packets in flight and this close()
629 * XXX is followed by a "rmmod sd_mod"?
635 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
637 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
638 struct scsi_device *sdp = sdkp->device;
639 struct Scsi_Host *host = sdp->host;
642 /* default to most commonly used values */
643 diskinfo[0] = 0x40; /* 1 << 6 */
644 diskinfo[1] = 0x20; /* 1 << 5 */
645 diskinfo[2] = sdkp->capacity >> 11;
647 /* override with calculated, extended default, or driver values */
648 if (host->hostt->bios_param)
649 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
651 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
653 geo->heads = diskinfo[0];
654 geo->sectors = diskinfo[1];
655 geo->cylinders = diskinfo[2];
660 * sd_ioctl - process an ioctl
661 * @inode: only i_rdev/i_bdev members may be used
662 * @filp: only f_mode and f_flags may be used
663 * @cmd: ioctl command number
664 * @arg: this is third argument given to ioctl(2) system call.
665 * Often contains a pointer.
667 * Returns 0 if successful (some ioctls return postive numbers on
668 * success as well). Returns a negated errno value in case of error.
670 * Note: most ioctls are forward onto the block subsystem or further
671 * down in the scsi subsystem.
673 static int sd_ioctl(struct inode * inode, struct file * filp,
674 unsigned int cmd, unsigned long arg)
676 struct block_device *bdev = inode->i_bdev;
677 struct gendisk *disk = bdev->bd_disk;
678 struct scsi_device *sdp = scsi_disk(disk)->device;
679 void __user *p = (void __user *)arg;
682 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
683 disk->disk_name, cmd));
686 * If we are in the middle of error recovery, don't let anyone
687 * else try and use this device. Also, if error recovery fails, it
688 * may try and take the device offline, in which case all further
689 * access to the device is prohibited.
691 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
692 if (!scsi_block_when_processing_errors(sdp) || !error)
696 * Send SCSI addressing ioctls directly to mid level, send other
697 * ioctls to block level and then onto mid level if they can't be
701 case SCSI_IOCTL_GET_IDLUN:
702 case SCSI_IOCTL_GET_BUS_NUMBER:
703 return scsi_ioctl(sdp, cmd, p);
705 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
706 if (error != -ENOTTY)
709 return scsi_ioctl(sdp, cmd, p);
712 static void set_media_not_present(struct scsi_disk *sdkp)
714 sdkp->media_present = 0;
716 sdkp->device->changed = 1;
720 * sd_media_changed - check if our medium changed
721 * @disk: kernel device descriptor
723 * Returns 0 if not applicable or no change; 1 if change
725 * Note: this function is invoked from the block subsystem.
727 static int sd_media_changed(struct gendisk *disk)
729 struct scsi_disk *sdkp = scsi_disk(disk);
730 struct scsi_device *sdp = sdkp->device;
733 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
739 * If the device is offline, don't send any commands - just pretend as
740 * if the command failed. If the device ever comes back online, we
741 * can deal with it then. It is only because of unrecoverable errors
742 * that we would ever take a device offline in the first place.
744 if (!scsi_device_online(sdp))
748 * Using TEST_UNIT_READY enables differentiation between drive with
749 * no cartridge loaded - NOT READY, drive with changed cartridge -
750 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
752 * Drives that auto spin down. eg iomega jaz 1G, will be started
753 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
754 * sd_revalidate() is called.
757 if (scsi_block_when_processing_errors(sdp))
758 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
761 * Unable to test, unit probably not ready. This usually
762 * means there is no disc in the drive. Mark as changed,
763 * and we will figure it out later once the drive is
770 * For removable scsi disk we have to recognise the presence
771 * of a disk in the drive. This is kept in the struct scsi_disk
772 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
774 sdkp->media_present = 1;
776 retval = sdp->changed;
782 set_media_not_present(sdkp);
786 static int sd_sync_cache(struct scsi_disk *sdkp)
789 struct scsi_device *sdp = sdkp->device;
790 struct scsi_sense_hdr sshdr;
792 if (!scsi_device_online(sdp))
796 for (retries = 3; retries > 0; --retries) {
797 unsigned char cmd[10] = { 0 };
799 cmd[0] = SYNCHRONIZE_CACHE;
801 * Leave the rest of the command zero to indicate
804 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
805 SD_TIMEOUT, SD_MAX_RETRIES);
811 sd_print_result(sdkp, res);
812 if (driver_byte(res) & DRIVER_SENSE)
813 sd_print_sense_hdr(sdkp, &sshdr);
821 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
823 memset(rq->cmd, 0, sizeof(rq->cmd));
824 rq->cmd_type = REQ_TYPE_BLOCK_PC;
825 rq->timeout = SD_TIMEOUT;
826 rq->cmd[0] = SYNCHRONIZE_CACHE;
830 static void sd_rescan(struct device *dev)
832 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
835 sd_revalidate_disk(sdkp->disk);
843 * This gets directly called from VFS. When the ioctl
844 * is not recognized we go back to the other translation paths.
846 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
848 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
849 struct gendisk *disk = bdev->bd_disk;
850 struct scsi_device *sdev = scsi_disk(disk)->device;
853 * If we are in the middle of error recovery, don't let anyone
854 * else try and use this device. Also, if error recovery fails, it
855 * may try and take the device offline, in which case all further
856 * access to the device is prohibited.
858 if (!scsi_block_when_processing_errors(sdev))
861 if (sdev->host->hostt->compat_ioctl) {
864 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
870 * Let the static ioctl translation table take care of it.
876 static struct block_device_operations sd_fops = {
877 .owner = THIS_MODULE,
879 .release = sd_release,
883 .compat_ioctl = sd_compat_ioctl,
885 .media_changed = sd_media_changed,
886 .revalidate_disk = sd_revalidate_disk,
890 * sd_rw_intr - bottom half handler: called when the lower level
891 * driver has completed (successfully or otherwise) a scsi command.
892 * @SCpnt: mid-level's per command structure.
894 * Note: potentially run from within an ISR. Must not block.
896 static void sd_rw_intr(struct scsi_cmnd * SCpnt)
898 int result = SCpnt->result;
899 unsigned int xfer_size = SCpnt->request_bufflen;
900 unsigned int good_bytes = result ? 0 : xfer_size;
901 u64 start_lba = SCpnt->request->sector;
903 struct scsi_sense_hdr sshdr;
905 int sense_deferred = 0;
909 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
911 sense_deferred = scsi_sense_is_deferred(&sshdr);
913 #ifdef CONFIG_SCSI_LOGGING
914 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
916 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
917 "sd_rw_intr: sb[respc,sk,asc,"
918 "ascq]=%x,%x,%x,%x\n",
920 sshdr.sense_key, sshdr.asc,
924 if (driver_byte(result) != DRIVER_SENSE &&
925 (!sense_valid || sense_deferred))
928 switch (sshdr.sense_key) {
931 if (!blk_fs_request(SCpnt->request))
933 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
934 SCSI_SENSE_BUFFERSIZE,
938 if (xfer_size <= SCpnt->device->sector_size)
940 switch (SCpnt->device->sector_size) {
956 /* Print something here with limiting frequency. */
960 /* This computation should always be done in terms of
961 * the resolution of the device's medium.
963 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
965 case RECOVERED_ERROR:
967 /* Inform the user, but make sure that it's not treated
970 scsi_print_sense("sd", SCpnt);
972 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
973 good_bytes = xfer_size;
975 case ILLEGAL_REQUEST:
976 if (SCpnt->device->use_10_for_rw &&
977 (SCpnt->cmnd[0] == READ_10 ||
978 SCpnt->cmnd[0] == WRITE_10))
979 SCpnt->device->use_10_for_rw = 0;
980 if (SCpnt->device->use_10_for_ms &&
981 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
982 SCpnt->cmnd[0] == MODE_SELECT_10))
983 SCpnt->device->use_10_for_ms = 0;
989 scsi_io_completion(SCpnt, good_bytes);
992 static int media_not_present(struct scsi_disk *sdkp,
993 struct scsi_sense_hdr *sshdr)
996 if (!scsi_sense_valid(sshdr))
998 /* not invoked for commands that could return deferred errors */
999 if (sshdr->sense_key != NOT_READY &&
1000 sshdr->sense_key != UNIT_ATTENTION)
1002 if (sshdr->asc != 0x3A) /* medium not present */
1005 set_media_not_present(sdkp);
1010 * spinup disk - called only in sd_revalidate_disk()
1013 sd_spinup_disk(struct scsi_disk *sdkp)
1015 unsigned char cmd[10];
1016 unsigned long spintime_expire = 0;
1017 int retries, spintime;
1018 unsigned int the_result;
1019 struct scsi_sense_hdr sshdr;
1020 int sense_valid = 0;
1024 /* Spin up drives, as required. Only do this at boot time */
1025 /* Spinup needs to be done for module loads too. */
1030 cmd[0] = TEST_UNIT_READY;
1031 memset((void *) &cmd[1], 0, 9);
1033 the_result = scsi_execute_req(sdkp->device, cmd,
1039 * If the drive has indicated to us that it
1040 * doesn't have any media in it, don't bother
1041 * with any more polling.
1043 if (media_not_present(sdkp, &sshdr))
1047 sense_valid = scsi_sense_valid(&sshdr);
1049 } while (retries < 3 &&
1050 (!scsi_status_is_good(the_result) ||
1051 ((driver_byte(the_result) & DRIVER_SENSE) &&
1052 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1054 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1055 /* no sense, TUR either succeeded or failed
1056 * with a status error */
1057 if(!spintime && !scsi_status_is_good(the_result)) {
1058 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1059 sd_print_result(sdkp, the_result);
1065 * The device does not want the automatic start to be issued.
1067 if (sdkp->device->no_start_on_add) {
1072 * If manual intervention is required, or this is an
1073 * absent USB storage device, a spinup is meaningless.
1076 sshdr.sense_key == NOT_READY &&
1077 sshdr.asc == 4 && sshdr.ascq == 3) {
1078 break; /* manual intervention required */
1081 * Issue command to spin up drive when not ready
1083 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1085 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1086 cmd[0] = START_STOP;
1087 cmd[1] = 1; /* Return immediately */
1088 memset((void *) &cmd[2], 0, 8);
1089 cmd[4] = 1; /* Start spin cycle */
1090 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1092 SD_TIMEOUT, SD_MAX_RETRIES);
1093 spintime_expire = jiffies + 100 * HZ;
1096 /* Wait 1 second for next try */
1101 * Wait for USB flash devices with slow firmware.
1102 * Yes, this sense key/ASC combination shouldn't
1103 * occur here. It's characteristic of these devices.
1105 } else if (sense_valid &&
1106 sshdr.sense_key == UNIT_ATTENTION &&
1107 sshdr.asc == 0x28) {
1109 spintime_expire = jiffies + 5 * HZ;
1112 /* Wait 1 second for next try */
1115 /* we don't understand the sense code, so it's
1116 * probably pointless to loop */
1118 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1119 sd_print_sense_hdr(sdkp, &sshdr);
1124 } while (spintime && time_before_eq(jiffies, spintime_expire));
1127 if (scsi_status_is_good(the_result))
1130 printk("not responding...\n");
1135 * read disk capacity
1138 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1140 unsigned char cmd[16];
1141 int the_result, retries;
1142 int sector_size = 0;
1144 struct scsi_sense_hdr sshdr;
1145 int sense_valid = 0;
1146 struct scsi_device *sdp = sdkp->device;
1152 memset((void *) cmd, 0, 16);
1153 cmd[0] = SERVICE_ACTION_IN;
1154 cmd[1] = SAI_READ_CAPACITY_16;
1156 memset((void *) buffer, 0, 12);
1158 cmd[0] = READ_CAPACITY;
1159 memset((void *) &cmd[1], 0, 9);
1160 memset((void *) buffer, 0, 8);
1163 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1164 buffer, longrc ? 12 : 8, &sshdr,
1165 SD_TIMEOUT, SD_MAX_RETRIES);
1167 if (media_not_present(sdkp, &sshdr))
1171 sense_valid = scsi_sense_valid(&sshdr);
1174 } while (the_result && retries);
1176 if (the_result && !longrc) {
1177 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1178 sd_print_result(sdkp, the_result);
1179 if (driver_byte(the_result) & DRIVER_SENSE)
1180 sd_print_sense_hdr(sdkp, &sshdr);
1182 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1184 /* Set dirty bit for removable devices if not ready -
1185 * sometimes drives will not report this properly. */
1186 if (sdp->removable &&
1187 sense_valid && sshdr.sense_key == NOT_READY)
1190 /* Either no media are present but the drive didn't tell us,
1191 or they are present but the read capacity command fails */
1192 /* sdkp->media_present = 0; -- not always correct */
1193 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1196 } else if (the_result && longrc) {
1197 /* READ CAPACITY(16) has been failed */
1198 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1199 sd_print_result(sdkp, the_result);
1200 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1202 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1207 sector_size = (buffer[4] << 24) |
1208 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1209 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1210 buffer[2] == 0xff && buffer[3] == 0xff) {
1211 if(sizeof(sdkp->capacity) > 4) {
1212 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1213 "Trying to use READ CAPACITY(16).\n");
1217 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1218 "a kernel compiled with support for large "
1219 "block devices.\n");
1223 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1228 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1229 ((u64)buffer[1] << 48) |
1230 ((u64)buffer[2] << 40) |
1231 ((u64)buffer[3] << 32) |
1232 ((sector_t)buffer[4] << 24) |
1233 ((sector_t)buffer[5] << 16) |
1234 ((sector_t)buffer[6] << 8) |
1235 (sector_t)buffer[7]);
1237 sector_size = (buffer[8] << 24) |
1238 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1241 /* Some devices return the total number of sectors, not the
1242 * highest sector number. Make the necessary adjustment. */
1243 if (sdp->fix_capacity) {
1246 /* Some devices have version which report the correct sizes
1247 * and others which do not. We guess size according to a heuristic
1248 * and err on the side of lowering the capacity. */
1250 if (sdp->guess_capacity)
1251 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1256 if (sector_size == 0) {
1258 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1262 if (sector_size != 512 &&
1263 sector_size != 1024 &&
1264 sector_size != 2048 &&
1265 sector_size != 4096 &&
1266 sector_size != 256) {
1267 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1270 * The user might want to re-format the drive with
1271 * a supported sectorsize. Once this happens, it
1272 * would be relatively trivial to set the thing up.
1273 * For this reason, we leave the thing in the table.
1277 * set a bogus sector size so the normal read/write
1278 * logic in the block layer will eventually refuse any
1279 * request on this device without tripping over power
1280 * of two sector size assumptions
1286 * The msdos fs needs to know the hardware sector size
1287 * So I have created this table. See ll_rw_blk.c
1288 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1290 int hard_sector = sector_size;
1291 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1292 struct request_queue *queue = sdp->request_queue;
1295 blk_queue_hardsect_size(queue, hard_sector);
1296 /* avoid 64-bit division on 32-bit platforms */
1297 sector_div(sz, 625);
1299 sector_div(mb, 1950);
1301 sd_printk(KERN_NOTICE, sdkp,
1302 "%llu %d-byte hardware sectors (%llu MB)\n",
1303 (unsigned long long)sdkp->capacity,
1304 hard_sector, (unsigned long long)mb);
1307 /* Rescale capacity to 512-byte units */
1308 if (sector_size == 4096)
1309 sdkp->capacity <<= 3;
1310 else if (sector_size == 2048)
1311 sdkp->capacity <<= 2;
1312 else if (sector_size == 1024)
1313 sdkp->capacity <<= 1;
1314 else if (sector_size == 256)
1315 sdkp->capacity >>= 1;
1317 sdkp->device->sector_size = sector_size;
1320 /* called with buffer of length 512 */
1322 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1323 unsigned char *buffer, int len, struct scsi_mode_data *data,
1324 struct scsi_sense_hdr *sshdr)
1326 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1327 SD_TIMEOUT, SD_MAX_RETRIES, data,
1332 * read write protect setting, if possible - called only in sd_revalidate_disk()
1333 * called with buffer of length SD_BUF_SIZE
1336 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1339 struct scsi_device *sdp = sdkp->device;
1340 struct scsi_mode_data data;
1342 set_disk_ro(sdkp->disk, 0);
1343 if (sdp->skip_ms_page_3f) {
1344 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1348 if (sdp->use_192_bytes_for_3f) {
1349 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1352 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1353 * We have to start carefully: some devices hang if we ask
1354 * for more than is available.
1356 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1359 * Second attempt: ask for page 0 When only page 0 is
1360 * implemented, a request for page 3F may return Sense Key
1361 * 5: Illegal Request, Sense Code 24: Invalid field in
1364 if (!scsi_status_is_good(res))
1365 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1368 * Third attempt: ask 255 bytes, as we did earlier.
1370 if (!scsi_status_is_good(res))
1371 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1375 if (!scsi_status_is_good(res)) {
1376 sd_printk(KERN_WARNING, sdkp,
1377 "Test WP failed, assume Write Enabled\n");
1379 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1380 set_disk_ro(sdkp->disk, sdkp->write_prot);
1381 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1382 sdkp->write_prot ? "on" : "off");
1383 sd_printk(KERN_DEBUG, sdkp,
1384 "Mode Sense: %02x %02x %02x %02x\n",
1385 buffer[0], buffer[1], buffer[2], buffer[3]);
1390 * sd_read_cache_type - called only from sd_revalidate_disk()
1391 * called with buffer of length SD_BUF_SIZE
1394 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1397 struct scsi_device *sdp = sdkp->device;
1401 struct scsi_mode_data data;
1402 struct scsi_sense_hdr sshdr;
1404 if (sdp->skip_ms_page_8)
1407 if (sdp->type == TYPE_RBC) {
1415 /* cautiously ask */
1416 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1418 if (!scsi_status_is_good(res))
1421 if (!data.header_length) {
1423 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1426 /* that went OK, now ask for the proper length */
1430 * We're only interested in the first three bytes, actually.
1431 * But the data cache page is defined for the first 20.
1438 /* Take headers and block descriptors into account */
1439 len += data.header_length + data.block_descriptor_length;
1440 if (len > SD_BUF_SIZE)
1444 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1446 if (scsi_status_is_good(res)) {
1447 int offset = data.header_length + data.block_descriptor_length;
1449 if (offset >= SD_BUF_SIZE - 2) {
1450 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1454 if ((buffer[offset] & 0x3f) != modepage) {
1455 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1459 if (modepage == 8) {
1460 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1461 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1463 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1467 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1468 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1469 sd_printk(KERN_NOTICE, sdkp,
1470 "Uses READ/WRITE(6), disabling FUA\n");
1474 sd_printk(KERN_NOTICE, sdkp,
1475 "Write cache: %s, read cache: %s, %s\n",
1476 sdkp->WCE ? "enabled" : "disabled",
1477 sdkp->RCD ? "disabled" : "enabled",
1478 sdkp->DPOFUA ? "supports DPO and FUA"
1479 : "doesn't support DPO or FUA");
1485 if (scsi_sense_valid(&sshdr) &&
1486 sshdr.sense_key == ILLEGAL_REQUEST &&
1487 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1488 /* Invalid field in CDB */
1489 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1491 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1494 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1501 * sd_revalidate_disk - called the first time a new disk is seen,
1502 * performs disk spin up, read_capacity, etc.
1503 * @disk: struct gendisk we care about
1505 static int sd_revalidate_disk(struct gendisk *disk)
1507 struct scsi_disk *sdkp = scsi_disk(disk);
1508 struct scsi_device *sdp = sdkp->device;
1509 unsigned char *buffer;
1512 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1513 "sd_revalidate_disk\n"));
1516 * If the device is offline, don't try and read capacity or any
1517 * of the other niceties.
1519 if (!scsi_device_online(sdp))
1522 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1524 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1525 "allocation failure.\n");
1529 /* defaults, until the device tells us otherwise */
1530 sdp->sector_size = 512;
1532 sdkp->media_present = 1;
1533 sdkp->write_prot = 0;
1537 sd_spinup_disk(sdkp);
1540 * Without media there is no reason to ask; moreover, some devices
1541 * react badly if we do.
1543 if (sdkp->media_present) {
1544 sd_read_capacity(sdkp, buffer);
1545 sd_read_write_protect_flag(sdkp, buffer);
1546 sd_read_cache_type(sdkp, buffer);
1550 * We now have all cache related info, determine how we deal
1551 * with ordered requests. Note that as the current SCSI
1552 * dispatch function can alter request order, we cannot use
1553 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1556 ordered = sdkp->DPOFUA
1557 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1559 ordered = QUEUE_ORDERED_DRAIN;
1561 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1563 set_capacity(disk, sdkp->capacity);
1571 * sd_probe - called during driver initialization and whenever a
1572 * new scsi device is attached to the system. It is called once
1573 * for each scsi device (not just disks) present.
1574 * @dev: pointer to device object
1576 * Returns 0 if successful (or not interested in this scsi device
1577 * (e.g. scanner)); 1 when there is an error.
1579 * Note: this function is invoked from the scsi mid-level.
1580 * This function sets up the mapping between a given
1581 * <host,channel,id,lun> (found in sdp) and new device name
1582 * (e.g. /dev/sda). More precisely it is the block device major
1583 * and minor number that is chosen here.
1585 * Assume sd_attach is not re-entrant (for time being)
1586 * Also think about sd_attach() and sd_remove() running coincidentally.
1588 static int sd_probe(struct device *dev)
1590 struct scsi_device *sdp = to_scsi_device(dev);
1591 struct scsi_disk *sdkp;
1597 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1600 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1604 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1608 gd = alloc_disk(16);
1612 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1615 spin_lock(&sd_index_lock);
1616 error = idr_get_new(&sd_index_idr, NULL, &index);
1617 spin_unlock(&sd_index_lock);
1619 if (index >= SD_MAX_DISKS)
1625 sdkp->driver = &sd_template;
1627 sdkp->index = index;
1630 if (!sdp->timeout) {
1631 if (sdp->type != TYPE_MOD)
1632 sdp->timeout = SD_TIMEOUT;
1634 sdp->timeout = SD_MOD_TIMEOUT;
1637 class_device_initialize(&sdkp->cdev);
1638 sdkp->cdev.dev = &sdp->sdev_gendev;
1639 sdkp->cdev.class = &sd_disk_class;
1640 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1642 if (class_device_add(&sdkp->cdev))
1645 get_device(&sdp->sdev_gendev);
1647 gd->major = sd_major((index & 0xf0) >> 4);
1648 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1650 gd->fops = &sd_fops;
1653 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1654 } else if (index < (26 + 1) * 26) {
1655 sprintf(gd->disk_name, "sd%c%c",
1656 'a' + index / 26 - 1,'a' + index % 26);
1658 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1659 const unsigned int m2 = (index / 26 - 1) % 26;
1660 const unsigned int m3 = index % 26;
1661 sprintf(gd->disk_name, "sd%c%c%c",
1662 'a' + m1, 'a' + m2, 'a' + m3);
1665 gd->private_data = &sdkp->driver;
1666 gd->queue = sdkp->device->request_queue;
1668 sd_revalidate_disk(gd);
1670 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1672 gd->driverfs_dev = &sdp->sdev_gendev;
1673 gd->flags = GENHD_FL_DRIVERFS;
1675 gd->flags |= GENHD_FL_REMOVABLE;
1677 dev_set_drvdata(dev, sdkp);
1680 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1681 sdp->removable ? "removable " : "");
1694 * sd_remove - called whenever a scsi disk (previously recognized by
1695 * sd_probe) is detached from the system. It is called (potentially
1696 * multiple times) during sd module unload.
1697 * @sdp: pointer to mid level scsi device object
1699 * Note: this function is invoked from the scsi mid-level.
1700 * This function potentially frees up a device name (e.g. /dev/sdc)
1701 * that could be re-used by a subsequent sd_probe().
1702 * This function is not called when the built-in sd driver is "exit-ed".
1704 static int sd_remove(struct device *dev)
1706 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1708 class_device_del(&sdkp->cdev);
1709 del_gendisk(sdkp->disk);
1712 mutex_lock(&sd_ref_mutex);
1713 dev_set_drvdata(dev, NULL);
1714 class_device_put(&sdkp->cdev);
1715 mutex_unlock(&sd_ref_mutex);
1721 * scsi_disk_release - Called to free the scsi_disk structure
1722 * @cdev: pointer to embedded class device
1724 * sd_ref_mutex must be held entering this routine. Because it is
1725 * called on last put, you should always use the scsi_disk_get()
1726 * scsi_disk_put() helpers which manipulate the semaphore directly
1727 * and never do a direct class_device_put().
1729 static void scsi_disk_release(struct class_device *cdev)
1731 struct scsi_disk *sdkp = to_scsi_disk(cdev);
1732 struct gendisk *disk = sdkp->disk;
1734 spin_lock(&sd_index_lock);
1735 idr_remove(&sd_index_idr, sdkp->index);
1736 spin_unlock(&sd_index_lock);
1738 disk->private_data = NULL;
1740 put_device(&sdkp->device->sdev_gendev);
1745 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1747 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1748 struct scsi_sense_hdr sshdr;
1749 struct scsi_device *sdp = sdkp->device;
1753 cmd[4] |= 1; /* START */
1755 if (!scsi_device_online(sdp))
1758 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1759 SD_TIMEOUT, SD_MAX_RETRIES);
1761 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1762 sd_print_result(sdkp, res);
1763 if (driver_byte(res) & DRIVER_SENSE)
1764 sd_print_sense_hdr(sdkp, &sshdr);
1771 * Send a SYNCHRONIZE CACHE instruction down to the device through
1772 * the normal SCSI command structure. Wait for the command to
1775 static void sd_shutdown(struct device *dev)
1777 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1780 return; /* this can happen */
1783 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1784 sd_sync_cache(sdkp);
1787 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1788 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1789 sd_start_stop_device(sdkp, 0);
1792 scsi_disk_put(sdkp);
1795 static int sd_suspend(struct device *dev, pm_message_t mesg)
1797 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1801 return 0; /* this can happen */
1804 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1805 ret = sd_sync_cache(sdkp);
1810 if (mesg.event == PM_EVENT_SUSPEND &&
1811 sdkp->device->manage_start_stop) {
1812 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1813 ret = sd_start_stop_device(sdkp, 0);
1817 scsi_disk_put(sdkp);
1821 static int sd_resume(struct device *dev)
1823 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1826 if (!sdkp->device->manage_start_stop)
1829 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
1830 ret = sd_start_stop_device(sdkp, 1);
1833 scsi_disk_put(sdkp);
1838 * init_sd - entry point for this driver (both when built in or when
1841 * Note: this function registers this driver with the scsi mid-level.
1843 static int __init init_sd(void)
1845 int majors = 0, i, err;
1847 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1849 for (i = 0; i < SD_MAJORS; i++)
1850 if (register_blkdev(sd_major(i), "sd") == 0)
1856 err = class_register(&sd_disk_class);
1860 err = scsi_register_driver(&sd_template.gendrv);
1867 class_unregister(&sd_disk_class);
1869 for (i = 0; i < SD_MAJORS; i++)
1870 unregister_blkdev(sd_major(i), "sd");
1875 * exit_sd - exit point for this driver (when it is a module).
1877 * Note: this function unregisters this driver from the scsi mid-level.
1879 static void __exit exit_sd(void)
1883 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1885 scsi_unregister_driver(&sd_template.gendrv);
1886 class_unregister(&sd_disk_class);
1888 for (i = 0; i < SD_MAJORS; i++)
1889 unregister_blkdev(sd_major(i), "sd");
1892 module_init(init_sd);
1893 module_exit(exit_sd);
1895 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1896 struct scsi_sense_hdr *sshdr)
1898 sd_printk(KERN_INFO, sdkp, "");
1899 scsi_show_sense_hdr(sshdr);
1900 sd_printk(KERN_INFO, sdkp, "");
1901 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1904 static void sd_print_result(struct scsi_disk *sdkp, int result)
1906 sd_printk(KERN_INFO, sdkp, "");
1907 scsi_show_result(result);