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/config.h>
36 #include <linux/module.h>
38 #include <linux/kernel.h>
39 #include <linux/sched.h>
41 #include <linux/bio.h>
42 #include <linux/genhd.h>
43 #include <linux/hdreg.h>
44 #include <linux/errno.h>
45 #include <linux/idr.h>
46 #include <linux/interrupt.h>
47 #include <linux/init.h>
48 #include <linux/blkdev.h>
49 #include <linux/blkpg.h>
50 #include <linux/kref.h>
51 #include <linux/delay.h>
52 #include <linux/mutex.h>
53 #include <asm/uaccess.h>
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_eh.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsicam.h>
65 #include "scsi_logging.h"
68 * More than enough for everybody ;) The huge number of majors
69 * is a leftover from 16bit dev_t days, we don't really need that
75 * This is limited by the naming scheme enforced in sd_probe,
76 * add another character to it if you really need more disks.
78 #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
81 * Time out in seconds for disks and Magneto-opticals (which are slower).
83 #define SD_TIMEOUT (30 * HZ)
84 #define SD_MOD_TIMEOUT (75 * HZ)
87 * Number of allowed retries
89 #define SD_MAX_RETRIES 5
90 #define SD_PASSTHROUGH_RETRIES 1
92 static void scsi_disk_release(struct kref
*kref
);
95 struct scsi_driver
*driver
; /* always &sd_template */
96 struct scsi_device
*device
;
99 unsigned int openers
; /* protected by BKL for now, yuck */
100 sector_t capacity
; /* size in 512-byte sectors */
104 unsigned WCE
: 1; /* state of disk WCE bit */
105 unsigned RCD
: 1; /* state of disk RCD bit, unused */
106 unsigned DPOFUA
: 1; /* state of disk DPOFUA bit */
109 static DEFINE_IDR(sd_index_idr
);
110 static DEFINE_SPINLOCK(sd_index_lock
);
112 /* This semaphore is used to mediate the 0->1 reference get in the
113 * face of object destruction (i.e. we can't allow a get on an
114 * object after last put) */
115 static DEFINE_MUTEX(sd_ref_mutex
);
117 static int sd_revalidate_disk(struct gendisk
*disk
);
118 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
);
120 static int sd_probe(struct device
*);
121 static int sd_remove(struct device
*);
122 static void sd_shutdown(struct device
*dev
);
123 static void sd_rescan(struct device
*);
124 static int sd_init_command(struct scsi_cmnd
*);
125 static int sd_issue_flush(struct device
*, sector_t
*);
126 static void sd_prepare_flush(request_queue_t
*, struct request
*);
127 static void sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
128 unsigned char *buffer
);
130 static struct scsi_driver sd_template
= {
131 .owner
= THIS_MODULE
,
136 .shutdown
= sd_shutdown
,
139 .init_command
= sd_init_command
,
140 .issue_flush
= sd_issue_flush
,
144 * Device no to disk mapping:
146 * major disc2 disc p1
147 * |............|.............|....|....| <- dev_t
150 * Inside a major, we have 16k disks, however mapped non-
151 * contiguously. The first 16 disks are for major0, the next
152 * ones with major1, ... Disk 256 is for major0 again, disk 272
154 * As we stay compatible with our numbering scheme, we can reuse
155 * the well-know SCSI majors 8, 65--71, 136--143.
157 static int sd_major(int major_idx
)
161 return SCSI_DISK0_MAJOR
;
163 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
165 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
168 return 0; /* shut up gcc */
172 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref)
174 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
176 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
179 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
181 struct scsi_disk
*sdkp
= NULL
;
183 if (disk
->private_data
) {
184 sdkp
= scsi_disk(disk
);
185 if (scsi_device_get(sdkp
->device
) == 0)
186 kref_get(&sdkp
->kref
);
193 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
195 struct scsi_disk
*sdkp
;
197 mutex_lock(&sd_ref_mutex
);
198 sdkp
= __scsi_disk_get(disk
);
199 mutex_unlock(&sd_ref_mutex
);
203 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
205 struct scsi_disk
*sdkp
;
207 mutex_lock(&sd_ref_mutex
);
208 sdkp
= dev_get_drvdata(dev
);
210 sdkp
= __scsi_disk_get(sdkp
->disk
);
211 mutex_unlock(&sd_ref_mutex
);
215 static void scsi_disk_put(struct scsi_disk
*sdkp
)
217 struct scsi_device
*sdev
= sdkp
->device
;
219 mutex_lock(&sd_ref_mutex
);
220 kref_put(&sdkp
->kref
, scsi_disk_release
);
221 scsi_device_put(sdev
);
222 mutex_unlock(&sd_ref_mutex
);
226 * sd_init_command - build a scsi (read or write) command from
227 * information in the request structure.
228 * @SCpnt: pointer to mid-level's per scsi command structure that
229 * contains request and into which the scsi command is written
231 * Returns 1 if successful and 0 if error (or cannot be done now).
233 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
235 struct scsi_device
*sdp
= SCpnt
->device
;
236 struct request
*rq
= SCpnt
->request
;
237 struct gendisk
*disk
= rq
->rq_disk
;
238 sector_t block
= rq
->sector
;
239 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
240 unsigned int timeout
= sdp
->timeout
;
242 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
243 "count=%d\n", disk
->disk_name
,
244 (unsigned long long)block
, this_count
));
246 if (!sdp
|| !scsi_device_online(sdp
) ||
247 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
248 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
250 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
256 * quietly refuse to do anything to a changed disc until
257 * the changed bit has been reset
259 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
262 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
263 disk
->disk_name
, (unsigned long long)block
));
266 * If we have a 1K hardware sectorsize, prevent access to single
267 * 512 byte sectors. In theory we could handle this - in fact
268 * the scsi cdrom driver must be able to handle this because
269 * we typically use 1K blocksizes, and cdroms typically have
270 * 2K hardware sectorsizes. Of course, things are simpler
271 * with the cdrom, since it is read-only. For performance
272 * reasons, the filesystems should be able to handle this
273 * and not force the scsi disk driver to use bounce buffers
276 if (sdp
->sector_size
== 1024) {
277 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
278 printk(KERN_ERR
"sd: Bad block number requested");
282 this_count
= this_count
>> 1;
285 if (sdp
->sector_size
== 2048) {
286 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
287 printk(KERN_ERR
"sd: Bad block number requested");
291 this_count
= this_count
>> 2;
294 if (sdp
->sector_size
== 4096) {
295 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
296 printk(KERN_ERR
"sd: Bad block number requested");
300 this_count
= this_count
>> 3;
303 if (rq_data_dir(rq
) == WRITE
) {
304 if (!sdp
->writeable
) {
307 SCpnt
->cmnd
[0] = WRITE_6
;
308 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
309 } else if (rq_data_dir(rq
) == READ
) {
310 SCpnt
->cmnd
[0] = READ_6
;
311 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
313 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
314 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
318 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
319 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
320 "writing" : "reading", this_count
, rq
->nr_sectors
));
324 if (block
> 0xffffffff) {
325 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
326 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
327 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
328 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
329 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
330 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
331 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
332 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
333 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
334 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
335 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
336 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
337 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
338 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
339 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
340 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
341 SCpnt
->device
->use_10_for_rw
) {
342 if (this_count
> 0xffff)
345 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
346 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
347 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
348 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
349 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
350 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
351 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
352 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
353 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
355 if (unlikely(blk_fua_rq(rq
))) {
357 * This happens only if this drive failed
358 * 10byte rw command with ILLEGAL_REQUEST
359 * during operation and thus turned off
362 printk(KERN_ERR
"sd: FUA write on READ/WRITE(6) drive\n");
366 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
367 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
368 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
369 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
372 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
373 this_count
* sdp
->sector_size
;
376 * We shouldn't disconnect in the middle of a sector, so with a dumb
377 * host adapter, it's safe to assume that we can at least transfer
378 * this many bytes between each connect / disconnect.
380 SCpnt
->transfersize
= sdp
->sector_size
;
381 SCpnt
->underflow
= this_count
<< 9;
382 SCpnt
->allowed
= SD_MAX_RETRIES
;
383 SCpnt
->timeout_per_command
= timeout
;
386 * This is the completion routine we use. This is matched in terms
387 * of capability to this function.
389 SCpnt
->done
= sd_rw_intr
;
392 * This indicates that the command is ready from our end to be
399 * sd_open - open a scsi disk device
400 * @inode: only i_rdev member may be used
401 * @filp: only f_mode and f_flags may be used
403 * Returns 0 if successful. Returns a negated errno value in case
406 * Note: This can be called from a user context (e.g. fsck(1) )
407 * or from within the kernel (e.g. as a result of a mount(1) ).
408 * In the latter case @inode and @filp carry an abridged amount
409 * of information as noted above.
411 static int sd_open(struct inode
*inode
, struct file
*filp
)
413 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
414 struct scsi_disk
*sdkp
;
415 struct scsi_device
*sdev
;
418 if (!(sdkp
= scsi_disk_get(disk
)))
422 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
427 * If the device is in error recovery, wait until it is done.
428 * If the device is offline, then disallow any access to it.
431 if (!scsi_block_when_processing_errors(sdev
))
434 if (sdev
->removable
|| sdkp
->write_prot
)
435 check_disk_change(inode
->i_bdev
);
438 * If the drive is empty, just let the open fail.
441 if (sdev
->removable
&& !sdkp
->media_present
&&
442 !(filp
->f_flags
& O_NDELAY
))
446 * If the device has the write protect tab set, have the open fail
447 * if the user expects to be able to write to the thing.
450 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
454 * It is possible that the disk changing stuff resulted in
455 * the device being taken offline. If this is the case,
456 * report this to the user, and don't pretend that the
457 * open actually succeeded.
460 if (!scsi_device_online(sdev
))
463 if (!sdkp
->openers
++ && sdev
->removable
) {
464 if (scsi_block_when_processing_errors(sdev
))
465 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
476 * sd_release - invoked when the (last) close(2) is called on this
478 * @inode: only i_rdev member may be used
479 * @filp: only f_mode and f_flags may be used
483 * Note: may block (uninterruptible) if error recovery is underway
486 static int sd_release(struct inode
*inode
, struct file
*filp
)
488 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
489 struct scsi_disk
*sdkp
= scsi_disk(disk
);
490 struct scsi_device
*sdev
= sdkp
->device
;
492 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
494 if (!--sdkp
->openers
&& sdev
->removable
) {
495 if (scsi_block_when_processing_errors(sdev
))
496 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
500 * XXX and what if there are packets in flight and this close()
501 * XXX is followed by a "rmmod sd_mod"?
507 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
509 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
510 struct scsi_device
*sdp
= sdkp
->device
;
511 struct Scsi_Host
*host
= sdp
->host
;
514 /* default to most commonly used values */
515 diskinfo
[0] = 0x40; /* 1 << 6 */
516 diskinfo
[1] = 0x20; /* 1 << 5 */
517 diskinfo
[2] = sdkp
->capacity
>> 11;
519 /* override with calculated, extended default, or driver values */
520 if (host
->hostt
->bios_param
)
521 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
523 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
525 geo
->heads
= diskinfo
[0];
526 geo
->sectors
= diskinfo
[1];
527 geo
->cylinders
= diskinfo
[2];
532 * sd_ioctl - process an ioctl
533 * @inode: only i_rdev/i_bdev members may be used
534 * @filp: only f_mode and f_flags may be used
535 * @cmd: ioctl command number
536 * @arg: this is third argument given to ioctl(2) system call.
537 * Often contains a pointer.
539 * Returns 0 if successful (some ioctls return postive numbers on
540 * success as well). Returns a negated errno value in case of error.
542 * Note: most ioctls are forward onto the block subsystem or further
543 * down in the scsi subsytem.
545 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
546 unsigned int cmd
, unsigned long arg
)
548 struct block_device
*bdev
= inode
->i_bdev
;
549 struct gendisk
*disk
= bdev
->bd_disk
;
550 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
551 void __user
*p
= (void __user
*)arg
;
554 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
555 disk
->disk_name
, cmd
));
558 * If we are in the middle of error recovery, don't let anyone
559 * else try and use this device. Also, if error recovery fails, it
560 * may try and take the device offline, in which case all further
561 * access to the device is prohibited.
563 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
564 if (!scsi_block_when_processing_errors(sdp
) || !error
)
568 * Send SCSI addressing ioctls directly to mid level, send other
569 * ioctls to block level and then onto mid level if they can't be
573 case SCSI_IOCTL_GET_IDLUN
:
574 case SCSI_IOCTL_GET_BUS_NUMBER
:
575 return scsi_ioctl(sdp
, cmd
, p
);
577 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
578 if (error
!= -ENOTTY
)
581 return scsi_ioctl(sdp
, cmd
, p
);
584 static void set_media_not_present(struct scsi_disk
*sdkp
)
586 sdkp
->media_present
= 0;
588 sdkp
->device
->changed
= 1;
592 * sd_media_changed - check if our medium changed
593 * @disk: kernel device descriptor
595 * Returns 0 if not applicable or no change; 1 if change
597 * Note: this function is invoked from the block subsystem.
599 static int sd_media_changed(struct gendisk
*disk
)
601 struct scsi_disk
*sdkp
= scsi_disk(disk
);
602 struct scsi_device
*sdp
= sdkp
->device
;
605 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
612 * If the device is offline, don't send any commands - just pretend as
613 * if the command failed. If the device ever comes back online, we
614 * can deal with it then. It is only because of unrecoverable errors
615 * that we would ever take a device offline in the first place.
617 if (!scsi_device_online(sdp
))
621 * Using TEST_UNIT_READY enables differentiation between drive with
622 * no cartridge loaded - NOT READY, drive with changed cartridge -
623 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
625 * Drives that auto spin down. eg iomega jaz 1G, will be started
626 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
627 * sd_revalidate() is called.
630 if (scsi_block_when_processing_errors(sdp
))
631 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
634 * Unable to test, unit probably not ready. This usually
635 * means there is no disc in the drive. Mark as changed,
636 * and we will figure it out later once the drive is
643 * For removable scsi disk we have to recognise the presence
644 * of a disk in the drive. This is kept in the struct scsi_disk
645 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
647 sdkp
->media_present
= 1;
649 retval
= sdp
->changed
;
655 set_media_not_present(sdkp
);
659 static int sd_sync_cache(struct scsi_device
*sdp
)
662 struct scsi_sense_hdr sshdr
;
664 if (!scsi_device_online(sdp
))
668 for (retries
= 3; retries
> 0; --retries
) {
669 unsigned char cmd
[10] = { 0 };
671 cmd
[0] = SYNCHRONIZE_CACHE
;
673 * Leave the rest of the command zero to indicate
676 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
677 SD_TIMEOUT
, SD_MAX_RETRIES
);
682 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
683 "host = %d, driver = %02x\n ",
684 status_byte(res
), msg_byte(res
),
685 host_byte(res
), driver_byte(res
));
686 if (driver_byte(res
) & DRIVER_SENSE
)
687 scsi_print_sense_hdr("sd", &sshdr
);
693 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
696 struct scsi_device
*sdp
= to_scsi_device(dev
);
697 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
703 ret
= sd_sync_cache(sdp
);
708 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
710 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
711 rq
->flags
|= REQ_BLOCK_PC
;
712 rq
->timeout
= SD_TIMEOUT
;
713 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
717 static void sd_rescan(struct device
*dev
)
719 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
722 sd_revalidate_disk(sdkp
->disk
);
730 * This gets directly called from VFS. When the ioctl
731 * is not recognized we go back to the other translation paths.
733 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
735 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
736 struct gendisk
*disk
= bdev
->bd_disk
;
737 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
740 * If we are in the middle of error recovery, don't let anyone
741 * else try and use this device. Also, if error recovery fails, it
742 * may try and take the device offline, in which case all further
743 * access to the device is prohibited.
745 if (!scsi_block_when_processing_errors(sdev
))
748 if (sdev
->host
->hostt
->compat_ioctl
) {
751 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
757 * Let the static ioctl translation table take care of it.
763 static struct block_device_operations sd_fops
= {
764 .owner
= THIS_MODULE
,
766 .release
= sd_release
,
770 .compat_ioctl
= sd_compat_ioctl
,
772 .media_changed
= sd_media_changed
,
773 .revalidate_disk
= sd_revalidate_disk
,
777 * sd_rw_intr - bottom half handler: called when the lower level
778 * driver has completed (successfully or otherwise) a scsi command.
779 * @SCpnt: mid-level's per command structure.
781 * Note: potentially run from within an ISR. Must not block.
783 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
785 int result
= SCpnt
->result
;
786 int this_count
= SCpnt
->bufflen
;
787 int good_bytes
= (result
== 0 ? this_count
: 0);
788 sector_t block_sectors
= 1;
790 sector_t error_sector
;
791 struct scsi_sense_hdr sshdr
;
793 int sense_deferred
= 0;
797 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
799 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
802 #ifdef CONFIG_SCSI_LOGGING
803 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
804 SCpnt
->request
->rq_disk
->disk_name
, result
));
806 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
807 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
808 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
812 Handle MEDIUM ERRORs that indicate partial success. Since this is a
813 relatively rare error condition, no care is taken to avoid
814 unnecessary additional work such as memcpy's that could be avoided.
816 if (driver_byte(result
) != 0 &&
817 sense_valid
&& !sense_deferred
) {
818 switch (sshdr
.sense_key
) {
820 if (!blk_fs_request(SCpnt
->request
))
822 info_valid
= scsi_get_sense_info_fld(
823 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
826 * May want to warn and skip if following cast results
827 * in actual truncation (if sector_t < 64 bits)
829 error_sector
= (sector_t
)first_err_block
;
830 if (SCpnt
->request
->bio
!= NULL
)
831 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
832 switch (SCpnt
->device
->sector_size
) {
835 if (block_sectors
< 2)
840 if (block_sectors
< 4)
845 if (block_sectors
< 8)
855 error_sector
&= ~(block_sectors
- 1);
856 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
857 if (good_bytes
< 0 || good_bytes
>= this_count
)
861 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
862 case NO_SENSE
: /* LLDD got sense data */
864 * Inform the user, but make sure that it's not treated
867 scsi_print_sense("sd", SCpnt
);
869 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
870 good_bytes
= this_count
;
873 case ILLEGAL_REQUEST
:
874 if (SCpnt
->device
->use_10_for_rw
&&
875 (SCpnt
->cmnd
[0] == READ_10
||
876 SCpnt
->cmnd
[0] == WRITE_10
))
877 SCpnt
->device
->use_10_for_rw
= 0;
878 if (SCpnt
->device
->use_10_for_ms
&&
879 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
880 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
881 SCpnt
->device
->use_10_for_ms
= 0;
889 * This calls the generic completion function, now that we know
890 * how many actual sectors finished, and how many sectors we need
891 * to say have failed.
893 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
896 static int media_not_present(struct scsi_disk
*sdkp
,
897 struct scsi_sense_hdr
*sshdr
)
900 if (!scsi_sense_valid(sshdr
))
902 /* not invoked for commands that could return deferred errors */
903 if (sshdr
->sense_key
!= NOT_READY
&&
904 sshdr
->sense_key
!= UNIT_ATTENTION
)
906 if (sshdr
->asc
!= 0x3A) /* medium not present */
909 set_media_not_present(sdkp
);
914 * spinup disk - called only in sd_revalidate_disk()
917 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
919 unsigned char cmd
[10];
920 unsigned long spintime_expire
= 0;
921 int retries
, spintime
;
922 unsigned int the_result
;
923 struct scsi_sense_hdr sshdr
;
928 /* Spin up drives, as required. Only do this at boot time */
929 /* Spinup needs to be done for module loads too. */
934 cmd
[0] = TEST_UNIT_READY
;
935 memset((void *) &cmd
[1], 0, 9);
937 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
943 sense_valid
= scsi_sense_valid(&sshdr
);
945 } while (retries
< 3 &&
946 (!scsi_status_is_good(the_result
) ||
947 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
948 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
951 * If the drive has indicated to us that it doesn't have
952 * any media in it, don't bother with any of the rest of
955 if (media_not_present(sdkp
, &sshdr
))
958 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
959 /* no sense, TUR either succeeded or failed
960 * with a status error */
961 if(!spintime
&& !scsi_status_is_good(the_result
))
962 printk(KERN_NOTICE
"%s: Unit Not Ready, "
963 "error = 0x%x\n", diskname
, the_result
);
968 * The device does not want the automatic start to be issued.
970 if (sdkp
->device
->no_start_on_add
) {
975 * If manual intervention is required, or this is an
976 * absent USB storage device, a spinup is meaningless.
979 sshdr
.sense_key
== NOT_READY
&&
980 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
981 break; /* manual intervention required */
984 * Issue command to spin up drive when not ready
986 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
988 printk(KERN_NOTICE
"%s: Spinning up disk...",
991 cmd
[1] = 1; /* Return immediately */
992 memset((void *) &cmd
[2], 0, 8);
993 cmd
[4] = 1; /* Start spin cycle */
994 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
996 SD_TIMEOUT
, SD_MAX_RETRIES
);
997 spintime_expire
= jiffies
+ 100 * HZ
;
1000 /* Wait 1 second for next try */
1005 * Wait for USB flash devices with slow firmware.
1006 * Yes, this sense key/ASC combination shouldn't
1007 * occur here. It's characteristic of these devices.
1009 } else if (sense_valid
&&
1010 sshdr
.sense_key
== UNIT_ATTENTION
&&
1011 sshdr
.asc
== 0x28) {
1013 spintime_expire
= jiffies
+ 5 * HZ
;
1016 /* Wait 1 second for next try */
1019 /* we don't understand the sense code, so it's
1020 * probably pointless to loop */
1022 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1023 "sense:\n", diskname
);
1024 scsi_print_sense_hdr("", &sshdr
);
1029 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1032 if (scsi_status_is_good(the_result
))
1035 printk("not responding...\n");
1040 * read disk capacity
1043 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1044 unsigned char *buffer
)
1046 unsigned char cmd
[16];
1047 int the_result
, retries
;
1048 int sector_size
= 0;
1050 struct scsi_sense_hdr sshdr
;
1051 int sense_valid
= 0;
1052 struct scsi_device
*sdp
= sdkp
->device
;
1058 memset((void *) cmd
, 0, 16);
1059 cmd
[0] = SERVICE_ACTION_IN
;
1060 cmd
[1] = SAI_READ_CAPACITY_16
;
1062 memset((void *) buffer
, 0, 12);
1064 cmd
[0] = READ_CAPACITY
;
1065 memset((void *) &cmd
[1], 0, 9);
1066 memset((void *) buffer
, 0, 8);
1069 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1070 buffer
, longrc
? 12 : 8, &sshdr
,
1071 SD_TIMEOUT
, SD_MAX_RETRIES
);
1073 if (media_not_present(sdkp
, &sshdr
))
1077 sense_valid
= scsi_sense_valid(&sshdr
);
1080 } while (the_result
&& retries
);
1082 if (the_result
&& !longrc
) {
1083 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1084 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1086 status_byte(the_result
),
1087 msg_byte(the_result
),
1088 host_byte(the_result
),
1089 driver_byte(the_result
));
1091 if (driver_byte(the_result
) & DRIVER_SENSE
)
1092 scsi_print_sense_hdr("sd", &sshdr
);
1094 printk("%s : sense not available. \n", diskname
);
1096 /* Set dirty bit for removable devices if not ready -
1097 * sometimes drives will not report this properly. */
1098 if (sdp
->removable
&&
1099 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1102 /* Either no media are present but the drive didn't tell us,
1103 or they are present but the read capacity command fails */
1104 /* sdkp->media_present = 0; -- not always correct */
1105 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1108 } else if (the_result
&& longrc
) {
1109 /* READ CAPACITY(16) has been failed */
1110 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1111 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1113 status_byte(the_result
),
1114 msg_byte(the_result
),
1115 host_byte(the_result
),
1116 driver_byte(the_result
));
1117 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1120 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1125 sector_size
= (buffer
[4] << 24) |
1126 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1127 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1128 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1129 if(sizeof(sdkp
->capacity
) > 4) {
1130 printk(KERN_NOTICE
"%s : very big device. try to use"
1131 " READ CAPACITY(16).\n", diskname
);
1135 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1136 "kernel compiled with support for large block "
1137 "devices.\n", diskname
);
1141 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1146 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1147 ((u64
)buffer
[1] << 48) |
1148 ((u64
)buffer
[2] << 40) |
1149 ((u64
)buffer
[3] << 32) |
1150 ((sector_t
)buffer
[4] << 24) |
1151 ((sector_t
)buffer
[5] << 16) |
1152 ((sector_t
)buffer
[6] << 8) |
1153 (sector_t
)buffer
[7]);
1155 sector_size
= (buffer
[8] << 24) |
1156 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1159 /* Some devices return the total number of sectors, not the
1160 * highest sector number. Make the necessary adjustment. */
1161 if (sdp
->fix_capacity
)
1165 if (sector_size
== 0) {
1167 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1168 "assuming 512.\n", diskname
);
1171 if (sector_size
!= 512 &&
1172 sector_size
!= 1024 &&
1173 sector_size
!= 2048 &&
1174 sector_size
!= 4096 &&
1175 sector_size
!= 256) {
1176 printk(KERN_NOTICE
"%s : unsupported sector size "
1177 "%d.\n", diskname
, sector_size
);
1179 * The user might want to re-format the drive with
1180 * a supported sectorsize. Once this happens, it
1181 * would be relatively trivial to set the thing up.
1182 * For this reason, we leave the thing in the table.
1186 * set a bogus sector size so the normal read/write
1187 * logic in the block layer will eventually refuse any
1188 * request on this device without tripping over power
1189 * of two sector size assumptions
1195 * The msdos fs needs to know the hardware sector size
1196 * So I have created this table. See ll_rw_blk.c
1197 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1199 int hard_sector
= sector_size
;
1200 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1201 request_queue_t
*queue
= sdp
->request_queue
;
1204 blk_queue_hardsect_size(queue
, hard_sector
);
1205 /* avoid 64-bit division on 32-bit platforms */
1206 sector_div(sz
, 625);
1208 sector_div(mb
, 1950);
1210 printk(KERN_NOTICE
"SCSI device %s: "
1211 "%llu %d-byte hdwr sectors (%llu MB)\n",
1212 diskname
, (unsigned long long)sdkp
->capacity
,
1213 hard_sector
, (unsigned long long)mb
);
1216 /* Rescale capacity to 512-byte units */
1217 if (sector_size
== 4096)
1218 sdkp
->capacity
<<= 3;
1219 else if (sector_size
== 2048)
1220 sdkp
->capacity
<<= 2;
1221 else if (sector_size
== 1024)
1222 sdkp
->capacity
<<= 1;
1223 else if (sector_size
== 256)
1224 sdkp
->capacity
>>= 1;
1226 sdkp
->device
->sector_size
= sector_size
;
1229 /* called with buffer of length 512 */
1231 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1232 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1233 struct scsi_sense_hdr
*sshdr
)
1235 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1236 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1241 * read write protect setting, if possible - called only in sd_revalidate_disk()
1242 * called with buffer of length 512
1245 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1246 unsigned char *buffer
)
1249 struct scsi_device
*sdp
= sdkp
->device
;
1250 struct scsi_mode_data data
;
1252 set_disk_ro(sdkp
->disk
, 0);
1253 if (sdp
->skip_ms_page_3f
) {
1254 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1258 if (sdp
->use_192_bytes_for_3f
) {
1259 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1262 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1263 * We have to start carefully: some devices hang if we ask
1264 * for more than is available.
1266 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1269 * Second attempt: ask for page 0 When only page 0 is
1270 * implemented, a request for page 3F may return Sense Key
1271 * 5: Illegal Request, Sense Code 24: Invalid field in
1274 if (!scsi_status_is_good(res
))
1275 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1278 * Third attempt: ask 255 bytes, as we did earlier.
1280 if (!scsi_status_is_good(res
))
1281 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1285 if (!scsi_status_is_good(res
)) {
1287 "%s: test WP failed, assume Write Enabled\n", diskname
);
1289 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1290 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1291 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1292 sdkp
->write_prot
? "on" : "off");
1293 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1294 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1299 * sd_read_cache_type - called only from sd_revalidate_disk()
1300 * called with buffer of length 512
1303 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1304 unsigned char *buffer
)
1307 struct scsi_device
*sdp
= sdkp
->device
;
1311 struct scsi_mode_data data
;
1312 struct scsi_sense_hdr sshdr
;
1314 if (sdp
->skip_ms_page_8
)
1317 if (sdp
->type
== TYPE_RBC
) {
1325 /* cautiously ask */
1326 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1328 if (!scsi_status_is_good(res
))
1331 /* that went OK, now ask for the proper length */
1335 * We're only interested in the first three bytes, actually.
1336 * But the data cache page is defined for the first 20.
1343 /* Take headers and block descriptors into account */
1344 len
+= data
.header_length
+ data
.block_descriptor_length
;
1347 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1349 if (scsi_status_is_good(res
)) {
1350 const char *types
[] = {
1351 "write through", "none", "write back",
1352 "write back, no read (daft)"
1355 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1357 if ((buffer
[offset
] & 0x3f) != modepage
) {
1358 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1362 if (modepage
== 8) {
1363 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1364 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1366 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1370 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1371 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1372 printk(KERN_NOTICE
"SCSI device %s: uses "
1373 "READ/WRITE(6), disabling FUA\n", diskname
);
1377 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1379 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s%s\n",
1380 diskname
, types
[ct
],
1381 sdkp
->DPOFUA
? " w/ FUA" : "");
1387 if (scsi_sense_valid(&sshdr
) &&
1388 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1389 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1390 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1391 diskname
); /* Invalid field in CDB */
1393 printk(KERN_ERR
"%s: asking for cache data failed\n",
1397 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1404 * sd_revalidate_disk - called the first time a new disk is seen,
1405 * performs disk spin up, read_capacity, etc.
1406 * @disk: struct gendisk we care about
1408 static int sd_revalidate_disk(struct gendisk
*disk
)
1410 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1411 struct scsi_device
*sdp
= sdkp
->device
;
1412 unsigned char *buffer
;
1415 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1418 * If the device is offline, don't try and read capacity or any
1419 * of the other niceties.
1421 if (!scsi_device_online(sdp
))
1424 buffer
= kmalloc(512, GFP_KERNEL
| __GFP_DMA
);
1426 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1431 /* defaults, until the device tells us otherwise */
1432 sdp
->sector_size
= 512;
1434 sdkp
->media_present
= 1;
1435 sdkp
->write_prot
= 0;
1439 sd_spinup_disk(sdkp
, disk
->disk_name
);
1442 * Without media there is no reason to ask; moreover, some devices
1443 * react badly if we do.
1445 if (sdkp
->media_present
) {
1446 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1447 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1448 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1452 * We now have all cache related info, determine how we deal
1453 * with ordered requests. Note that as the current SCSI
1454 * dispatch function can alter request order, we cannot use
1455 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1458 ordered
= sdkp
->DPOFUA
1459 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1461 ordered
= QUEUE_ORDERED_DRAIN
;
1463 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1465 set_capacity(disk
, sdkp
->capacity
);
1473 * sd_probe - called during driver initialization and whenever a
1474 * new scsi device is attached to the system. It is called once
1475 * for each scsi device (not just disks) present.
1476 * @dev: pointer to device object
1478 * Returns 0 if successful (or not interested in this scsi device
1479 * (e.g. scanner)); 1 when there is an error.
1481 * Note: this function is invoked from the scsi mid-level.
1482 * This function sets up the mapping between a given
1483 * <host,channel,id,lun> (found in sdp) and new device name
1484 * (e.g. /dev/sda). More precisely it is the block device major
1485 * and minor number that is chosen here.
1487 * Assume sd_attach is not re-entrant (for time being)
1488 * Also think about sd_attach() and sd_remove() running coincidentally.
1490 static int sd_probe(struct device
*dev
)
1492 struct scsi_device
*sdp
= to_scsi_device(dev
);
1493 struct scsi_disk
*sdkp
;
1499 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1502 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1506 sdkp
= kmalloc(sizeof(*sdkp
), GFP_KERNEL
);
1510 memset (sdkp
, 0, sizeof(*sdkp
));
1511 kref_init(&sdkp
->kref
);
1513 gd
= alloc_disk(16);
1517 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1520 spin_lock(&sd_index_lock
);
1521 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1522 spin_unlock(&sd_index_lock
);
1524 if (index
>= SD_MAX_DISKS
)
1529 get_device(&sdp
->sdev_gendev
);
1531 sdkp
->driver
= &sd_template
;
1533 sdkp
->index
= index
;
1536 if (!sdp
->timeout
) {
1537 if (sdp
->type
!= TYPE_MOD
)
1538 sdp
->timeout
= SD_TIMEOUT
;
1540 sdp
->timeout
= SD_MOD_TIMEOUT
;
1543 gd
->major
= sd_major((index
& 0xf0) >> 4);
1544 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1546 gd
->fops
= &sd_fops
;
1549 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1550 } else if (index
< (26 + 1) * 26) {
1551 sprintf(gd
->disk_name
, "sd%c%c",
1552 'a' + index
/ 26 - 1,'a' + index
% 26);
1554 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1555 const unsigned int m2
= (index
/ 26 - 1) % 26;
1556 const unsigned int m3
= index
% 26;
1557 sprintf(gd
->disk_name
, "sd%c%c%c",
1558 'a' + m1
, 'a' + m2
, 'a' + m3
);
1561 strcpy(gd
->devfs_name
, sdp
->devfs_name
);
1563 gd
->private_data
= &sdkp
->driver
;
1564 gd
->queue
= sdkp
->device
->request_queue
;
1566 sd_revalidate_disk(gd
);
1568 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1569 gd
->flags
= GENHD_FL_DRIVERFS
;
1571 gd
->flags
|= GENHD_FL_REMOVABLE
;
1573 dev_set_drvdata(dev
, sdkp
);
1576 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1577 sdp
->removable
? "removable " : "", gd
->disk_name
);
1590 * sd_remove - called whenever a scsi disk (previously recognized by
1591 * sd_probe) is detached from the system. It is called (potentially
1592 * multiple times) during sd module unload.
1593 * @sdp: pointer to mid level scsi device object
1595 * Note: this function is invoked from the scsi mid-level.
1596 * This function potentially frees up a device name (e.g. /dev/sdc)
1597 * that could be re-used by a subsequent sd_probe().
1598 * This function is not called when the built-in sd driver is "exit-ed".
1600 static int sd_remove(struct device
*dev
)
1602 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1604 del_gendisk(sdkp
->disk
);
1607 mutex_lock(&sd_ref_mutex
);
1608 dev_set_drvdata(dev
, NULL
);
1609 kref_put(&sdkp
->kref
, scsi_disk_release
);
1610 mutex_unlock(&sd_ref_mutex
);
1616 * scsi_disk_release - Called to free the scsi_disk structure
1617 * @kref: pointer to embedded kref
1619 * sd_ref_mutex must be held entering this routine. Because it is
1620 * called on last put, you should always use the scsi_disk_get()
1621 * scsi_disk_put() helpers which manipulate the semaphore directly
1622 * and never do a direct kref_put().
1624 static void scsi_disk_release(struct kref
*kref
)
1626 struct scsi_disk
*sdkp
= to_scsi_disk(kref
);
1627 struct gendisk
*disk
= sdkp
->disk
;
1629 spin_lock(&sd_index_lock
);
1630 idr_remove(&sd_index_idr
, sdkp
->index
);
1631 spin_unlock(&sd_index_lock
);
1633 disk
->private_data
= NULL
;
1635 put_device(&sdkp
->device
->sdev_gendev
);
1641 * Send a SYNCHRONIZE CACHE instruction down to the device through
1642 * the normal SCSI command structure. Wait for the command to
1645 static void sd_shutdown(struct device
*dev
)
1647 struct scsi_device
*sdp
= to_scsi_device(dev
);
1648 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1651 return; /* this can happen */
1654 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1655 sdkp
->disk
->disk_name
);
1658 scsi_disk_put(sdkp
);
1662 * init_sd - entry point for this driver (both when built in or when
1665 * Note: this function registers this driver with the scsi mid-level.
1667 static int __init
init_sd(void)
1671 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1673 for (i
= 0; i
< SD_MAJORS
; i
++)
1674 if (register_blkdev(sd_major(i
), "sd") == 0)
1680 return scsi_register_driver(&sd_template
.gendrv
);
1684 * exit_sd - exit point for this driver (when it is a module).
1686 * Note: this function unregisters this driver from the scsi mid-level.
1688 static void __exit
exit_sd(void)
1692 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1694 scsi_unregister_driver(&sd_template
.gendrv
);
1695 for (i
= 0; i
< SD_MAJORS
; i
++)
1696 unregister_blkdev(sd_major(i
), "sd");
1699 MODULE_LICENSE("GPL");
1700 MODULE_AUTHOR("Eric Youngdale");
1701 MODULE_DESCRIPTION("SCSI disk (sd) driver");
1703 module_init(init_sd
);
1704 module_exit(exit_sd
);