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 <asm/uaccess.h>
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_eh.h>
60 #include <scsi/scsi_host.h>
61 #include <scsi/scsi_ioctl.h>
62 #include <scsi/scsicam.h>
64 #include "scsi_logging.h"
67 * More than enough for everybody ;) The huge number of majors
68 * is a leftover from 16bit dev_t days, we don't really need that
74 * This is limited by the naming scheme enforced in sd_probe,
75 * add another character to it if you really need more disks.
77 #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
80 * Time out in seconds for disks and Magneto-opticals (which are slower).
82 #define SD_TIMEOUT (30 * HZ)
83 #define SD_MOD_TIMEOUT (75 * HZ)
86 * Number of allowed retries
88 #define SD_MAX_RETRIES 5
89 #define SD_PASSTHROUGH_RETRIES 1
91 static void scsi_disk_release(struct kref
*kref
);
94 struct scsi_driver
*driver
; /* always &sd_template */
95 struct scsi_device
*device
;
98 unsigned int openers
; /* protected by BKL for now, yuck */
99 sector_t capacity
; /* size in 512-byte sectors */
103 unsigned WCE
: 1; /* state of disk WCE bit */
104 unsigned RCD
: 1; /* state of disk RCD bit, unused */
107 static DEFINE_IDR(sd_index_idr
);
108 static DEFINE_SPINLOCK(sd_index_lock
);
110 /* This semaphore is used to mediate the 0->1 reference get in the
111 * face of object destruction (i.e. we can't allow a get on an
112 * object after last put) */
113 static DECLARE_MUTEX(sd_ref_sem
);
115 static int sd_revalidate_disk(struct gendisk
*disk
);
116 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
);
118 static int sd_probe(struct device
*);
119 static int sd_remove(struct device
*);
120 static void sd_shutdown(struct device
*dev
);
121 static void sd_rescan(struct device
*);
122 static int sd_init_command(struct scsi_cmnd
*);
123 static int sd_issue_flush(struct device
*, sector_t
*);
124 static void sd_prepare_flush(request_queue_t
*, struct request
*);
125 static void sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
126 unsigned char *buffer
);
128 static struct scsi_driver sd_template
= {
129 .owner
= THIS_MODULE
,
134 .shutdown
= sd_shutdown
,
137 .init_command
= sd_init_command
,
138 .issue_flush
= sd_issue_flush
,
142 * Device no to disk mapping:
144 * major disc2 disc p1
145 * |............|.............|....|....| <- dev_t
148 * Inside a major, we have 16k disks, however mapped non-
149 * contiguously. The first 16 disks are for major0, the next
150 * ones with major1, ... Disk 256 is for major0 again, disk 272
152 * As we stay compatible with our numbering scheme, we can reuse
153 * the well-know SCSI majors 8, 65--71, 136--143.
155 static int sd_major(int major_idx
)
159 return SCSI_DISK0_MAJOR
;
161 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
163 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
166 return 0; /* shut up gcc */
170 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref)
172 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
174 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
177 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
179 struct scsi_disk
*sdkp
= NULL
;
181 if (disk
->private_data
) {
182 sdkp
= scsi_disk(disk
);
183 if (scsi_device_get(sdkp
->device
) == 0)
184 kref_get(&sdkp
->kref
);
191 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
193 struct scsi_disk
*sdkp
;
196 sdkp
= __scsi_disk_get(disk
);
201 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
203 struct scsi_disk
*sdkp
;
206 sdkp
= dev_get_drvdata(dev
);
208 sdkp
= __scsi_disk_get(sdkp
->disk
);
213 static void scsi_disk_put(struct scsi_disk
*sdkp
)
215 struct scsi_device
*sdev
= sdkp
->device
;
218 kref_put(&sdkp
->kref
, scsi_disk_release
);
219 scsi_device_put(sdev
);
224 * sd_init_command - build a scsi (read or write) command from
225 * information in the request structure.
226 * @SCpnt: pointer to mid-level's per scsi command structure that
227 * contains request and into which the scsi command is written
229 * Returns 1 if successful and 0 if error (or cannot be done now).
231 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
233 unsigned int this_count
, timeout
;
234 struct gendisk
*disk
;
236 struct scsi_device
*sdp
= SCpnt
->device
;
237 struct request
*rq
= SCpnt
->request
;
239 timeout
= sdp
->timeout
;
242 * SG_IO from block layer already setup, just copy cdb basically
244 if (blk_pc_request(rq
)) {
245 scsi_setup_blk_pc_cmnd(SCpnt
);
247 timeout
= rq
->timeout
;
253 * we only do REQ_CMD and REQ_BLOCK_PC
255 if (!blk_fs_request(rq
))
260 this_count
= SCpnt
->request_bufflen
>> 9;
262 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
263 "count=%d\n", disk
->disk_name
,
264 (unsigned long long)block
, this_count
));
266 if (!sdp
|| !scsi_device_online(sdp
) ||
267 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
268 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
270 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
276 * quietly refuse to do anything to a changed disc until
277 * the changed bit has been reset
279 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
282 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
283 disk
->disk_name
, (unsigned long long)block
));
286 * If we have a 1K hardware sectorsize, prevent access to single
287 * 512 byte sectors. In theory we could handle this - in fact
288 * the scsi cdrom driver must be able to handle this because
289 * we typically use 1K blocksizes, and cdroms typically have
290 * 2K hardware sectorsizes. Of course, things are simpler
291 * with the cdrom, since it is read-only. For performance
292 * reasons, the filesystems should be able to handle this
293 * and not force the scsi disk driver to use bounce buffers
296 if (sdp
->sector_size
== 1024) {
297 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
298 printk(KERN_ERR
"sd: Bad block number requested");
302 this_count
= this_count
>> 1;
305 if (sdp
->sector_size
== 2048) {
306 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
307 printk(KERN_ERR
"sd: Bad block number requested");
311 this_count
= this_count
>> 2;
314 if (sdp
->sector_size
== 4096) {
315 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
316 printk(KERN_ERR
"sd: Bad block number requested");
320 this_count
= this_count
>> 3;
323 if (rq_data_dir(rq
) == WRITE
) {
324 if (!sdp
->writeable
) {
327 SCpnt
->cmnd
[0] = WRITE_6
;
328 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
329 } else if (rq_data_dir(rq
) == READ
) {
330 SCpnt
->cmnd
[0] = READ_6
;
331 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
333 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
334 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
338 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
339 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
340 "writing" : "reading", this_count
, rq
->nr_sectors
));
344 if (block
> 0xffffffff) {
345 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
346 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
347 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
348 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
349 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
350 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
351 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
352 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
353 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
354 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
355 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
356 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
357 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
358 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
359 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
360 SCpnt
->device
->use_10_for_rw
) {
361 if (this_count
> 0xffff)
364 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
365 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
366 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
367 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
368 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
369 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
370 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
371 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
373 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
374 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
375 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
376 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
379 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
380 this_count
* sdp
->sector_size
;
383 * We shouldn't disconnect in the middle of a sector, so with a dumb
384 * host adapter, it's safe to assume that we can at least transfer
385 * this many bytes between each connect / disconnect.
387 SCpnt
->transfersize
= sdp
->sector_size
;
388 SCpnt
->underflow
= this_count
<< 9;
389 SCpnt
->allowed
= SD_MAX_RETRIES
;
392 SCpnt
->timeout_per_command
= timeout
;
395 * This is the completion routine we use. This is matched in terms
396 * of capability to this function.
398 SCpnt
->done
= sd_rw_intr
;
401 * This indicates that the command is ready from our end to be
408 * sd_open - open a scsi disk device
409 * @inode: only i_rdev member may be used
410 * @filp: only f_mode and f_flags may be used
412 * Returns 0 if successful. Returns a negated errno value in case
415 * Note: This can be called from a user context (e.g. fsck(1) )
416 * or from within the kernel (e.g. as a result of a mount(1) ).
417 * In the latter case @inode and @filp carry an abridged amount
418 * of information as noted above.
420 static int sd_open(struct inode
*inode
, struct file
*filp
)
422 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
423 struct scsi_disk
*sdkp
;
424 struct scsi_device
*sdev
;
427 if (!(sdkp
= scsi_disk_get(disk
)))
431 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
436 * If the device is in error recovery, wait until it is done.
437 * If the device is offline, then disallow any access to it.
440 if (!scsi_block_when_processing_errors(sdev
))
443 if (sdev
->removable
|| sdkp
->write_prot
)
444 check_disk_change(inode
->i_bdev
);
447 * If the drive is empty, just let the open fail.
450 if (sdev
->removable
&& !sdkp
->media_present
&&
451 !(filp
->f_flags
& O_NDELAY
))
455 * If the device has the write protect tab set, have the open fail
456 * if the user expects to be able to write to the thing.
459 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
463 * It is possible that the disk changing stuff resulted in
464 * the device being taken offline. If this is the case,
465 * report this to the user, and don't pretend that the
466 * open actually succeeded.
469 if (!scsi_device_online(sdev
))
472 if (!sdkp
->openers
++ && sdev
->removable
) {
473 if (scsi_block_when_processing_errors(sdev
))
474 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
485 * sd_release - invoked when the (last) close(2) is called on this
487 * @inode: only i_rdev member may be used
488 * @filp: only f_mode and f_flags may be used
492 * Note: may block (uninterruptible) if error recovery is underway
495 static int sd_release(struct inode
*inode
, struct file
*filp
)
497 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
498 struct scsi_disk
*sdkp
= scsi_disk(disk
);
499 struct scsi_device
*sdev
= sdkp
->device
;
501 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
503 if (!--sdkp
->openers
&& sdev
->removable
) {
504 if (scsi_block_when_processing_errors(sdev
))
505 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
509 * XXX and what if there are packets in flight and this close()
510 * XXX is followed by a "rmmod sd_mod"?
516 static int sd_hdio_getgeo(struct block_device
*bdev
, struct hd_geometry __user
*loc
)
518 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
519 struct scsi_device
*sdp
= sdkp
->device
;
520 struct Scsi_Host
*host
= sdp
->host
;
523 /* default to most commonly used values */
524 diskinfo
[0] = 0x40; /* 1 << 6 */
525 diskinfo
[1] = 0x20; /* 1 << 5 */
526 diskinfo
[2] = sdkp
->capacity
>> 11;
528 /* override with calculated, extended default, or driver values */
529 if (host
->hostt
->bios_param
)
530 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
532 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
534 if (put_user(diskinfo
[0], &loc
->heads
))
536 if (put_user(diskinfo
[1], &loc
->sectors
))
538 if (put_user(diskinfo
[2], &loc
->cylinders
))
540 if (put_user((unsigned)get_start_sect(bdev
),
541 (unsigned long __user
*)&loc
->start
))
547 * sd_ioctl - process an ioctl
548 * @inode: only i_rdev/i_bdev members may be used
549 * @filp: only f_mode and f_flags may be used
550 * @cmd: ioctl command number
551 * @arg: this is third argument given to ioctl(2) system call.
552 * Often contains a pointer.
554 * Returns 0 if successful (some ioctls return postive numbers on
555 * success as well). Returns a negated errno value in case of error.
557 * Note: most ioctls are forward onto the block subsystem or further
558 * down in the scsi subsytem.
560 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
561 unsigned int cmd
, unsigned long arg
)
563 struct block_device
*bdev
= inode
->i_bdev
;
564 struct gendisk
*disk
= bdev
->bd_disk
;
565 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
566 void __user
*p
= (void __user
*)arg
;
569 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
570 disk
->disk_name
, cmd
));
573 * If we are in the middle of error recovery, don't let anyone
574 * else try and use this device. Also, if error recovery fails, it
575 * may try and take the device offline, in which case all further
576 * access to the device is prohibited.
578 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
579 if (!scsi_block_when_processing_errors(sdp
) || !error
)
582 if (cmd
== HDIO_GETGEO
) {
585 return sd_hdio_getgeo(bdev
, p
);
589 * Send SCSI addressing ioctls directly to mid level, send other
590 * ioctls to block level and then onto mid level if they can't be
594 case SCSI_IOCTL_GET_IDLUN
:
595 case SCSI_IOCTL_GET_BUS_NUMBER
:
596 return scsi_ioctl(sdp
, cmd
, p
);
598 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
599 if (error
!= -ENOTTY
)
602 return scsi_ioctl(sdp
, cmd
, p
);
605 static void set_media_not_present(struct scsi_disk
*sdkp
)
607 sdkp
->media_present
= 0;
609 sdkp
->device
->changed
= 1;
613 * sd_media_changed - check if our medium changed
614 * @disk: kernel device descriptor
616 * Returns 0 if not applicable or no change; 1 if change
618 * Note: this function is invoked from the block subsystem.
620 static int sd_media_changed(struct gendisk
*disk
)
622 struct scsi_disk
*sdkp
= scsi_disk(disk
);
623 struct scsi_device
*sdp
= sdkp
->device
;
626 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
633 * If the device is offline, don't send any commands - just pretend as
634 * if the command failed. If the device ever comes back online, we
635 * can deal with it then. It is only because of unrecoverable errors
636 * that we would ever take a device offline in the first place.
638 if (!scsi_device_online(sdp
))
642 * Using TEST_UNIT_READY enables differentiation between drive with
643 * no cartridge loaded - NOT READY, drive with changed cartridge -
644 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
646 * Drives that auto spin down. eg iomega jaz 1G, will be started
647 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
648 * sd_revalidate() is called.
651 if (scsi_block_when_processing_errors(sdp
))
652 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
655 * Unable to test, unit probably not ready. This usually
656 * means there is no disc in the drive. Mark as changed,
657 * and we will figure it out later once the drive is
664 * For removable scsi disk we have to recognise the presence
665 * of a disk in the drive. This is kept in the struct scsi_disk
666 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
668 sdkp
->media_present
= 1;
670 retval
= sdp
->changed
;
676 set_media_not_present(sdkp
);
680 static int sd_sync_cache(struct scsi_device
*sdp
)
683 struct scsi_sense_hdr sshdr
;
685 if (!scsi_device_online(sdp
))
689 for (retries
= 3; retries
> 0; --retries
) {
690 unsigned char cmd
[10] = { 0 };
692 cmd
[0] = SYNCHRONIZE_CACHE
;
694 * Leave the rest of the command zero to indicate
697 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
698 SD_TIMEOUT
, SD_MAX_RETRIES
);
703 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
704 "host = %d, driver = %02x\n ",
705 status_byte(res
), msg_byte(res
),
706 host_byte(res
), driver_byte(res
));
707 if (driver_byte(res
) & DRIVER_SENSE
)
708 scsi_print_sense_hdr("sd", &sshdr
);
714 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
717 struct scsi_device
*sdp
= to_scsi_device(dev
);
718 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
724 ret
= sd_sync_cache(sdp
);
729 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
731 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
732 rq
->flags
|= REQ_BLOCK_PC
;
733 rq
->timeout
= SD_TIMEOUT
;
734 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
738 static void sd_rescan(struct device
*dev
)
740 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
743 sd_revalidate_disk(sdkp
->disk
);
751 * This gets directly called from VFS. When the ioctl
752 * is not recognized we go back to the other translation paths.
754 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
756 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
757 struct gendisk
*disk
= bdev
->bd_disk
;
758 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
761 * If we are in the middle of error recovery, don't let anyone
762 * else try and use this device. Also, if error recovery fails, it
763 * may try and take the device offline, in which case all further
764 * access to the device is prohibited.
766 if (!scsi_block_when_processing_errors(sdev
))
769 if (sdev
->host
->hostt
->compat_ioctl
) {
772 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
778 * Let the static ioctl translation table take care of it.
784 static struct block_device_operations sd_fops
= {
785 .owner
= THIS_MODULE
,
787 .release
= sd_release
,
790 .compat_ioctl
= sd_compat_ioctl
,
792 .media_changed
= sd_media_changed
,
793 .revalidate_disk
= sd_revalidate_disk
,
797 * sd_rw_intr - bottom half handler: called when the lower level
798 * driver has completed (successfully or otherwise) a scsi command.
799 * @SCpnt: mid-level's per command structure.
801 * Note: potentially run from within an ISR. Must not block.
803 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
805 int result
= SCpnt
->result
;
806 int this_count
= SCpnt
->bufflen
;
807 int good_bytes
= (result
== 0 ? this_count
: 0);
808 sector_t block_sectors
= 1;
810 sector_t error_sector
;
811 struct scsi_sense_hdr sshdr
;
813 int sense_deferred
= 0;
817 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
819 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
822 #ifdef CONFIG_SCSI_LOGGING
823 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
824 SCpnt
->request
->rq_disk
->disk_name
, result
));
826 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
827 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
828 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
832 Handle MEDIUM ERRORs that indicate partial success. Since this is a
833 relatively rare error condition, no care is taken to avoid
834 unnecessary additional work such as memcpy's that could be avoided.
838 * If SG_IO from block layer then set good_bytes to stop retries;
839 * else if errors, check them, and if necessary prepare for
842 if (blk_pc_request(SCpnt
->request
))
843 good_bytes
= this_count
;
844 else if (driver_byte(result
) != 0 &&
845 sense_valid
&& !sense_deferred
) {
846 switch (sshdr
.sense_key
) {
848 if (!blk_fs_request(SCpnt
->request
))
850 info_valid
= scsi_get_sense_info_fld(
851 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
854 * May want to warn and skip if following cast results
855 * in actual truncation (if sector_t < 64 bits)
857 error_sector
= (sector_t
)first_err_block
;
858 if (SCpnt
->request
->bio
!= NULL
)
859 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
860 switch (SCpnt
->device
->sector_size
) {
863 if (block_sectors
< 2)
868 if (block_sectors
< 4)
873 if (block_sectors
< 8)
883 error_sector
&= ~(block_sectors
- 1);
884 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
885 if (good_bytes
< 0 || good_bytes
>= this_count
)
889 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
890 case NO_SENSE
: /* LLDD got sense data */
892 * Inform the user, but make sure that it's not treated
895 scsi_print_sense("sd", SCpnt
);
897 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
898 good_bytes
= this_count
;
901 case ILLEGAL_REQUEST
:
902 if (SCpnt
->device
->use_10_for_rw
&&
903 (SCpnt
->cmnd
[0] == READ_10
||
904 SCpnt
->cmnd
[0] == WRITE_10
))
905 SCpnt
->device
->use_10_for_rw
= 0;
906 if (SCpnt
->device
->use_10_for_ms
&&
907 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
908 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
909 SCpnt
->device
->use_10_for_ms
= 0;
917 * This calls the generic completion function, now that we know
918 * how many actual sectors finished, and how many sectors we need
919 * to say have failed.
921 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
924 static int media_not_present(struct scsi_disk
*sdkp
,
925 struct scsi_sense_hdr
*sshdr
)
928 if (!scsi_sense_valid(sshdr
))
930 /* not invoked for commands that could return deferred errors */
931 if (sshdr
->sense_key
!= NOT_READY
&&
932 sshdr
->sense_key
!= UNIT_ATTENTION
)
934 if (sshdr
->asc
!= 0x3A) /* medium not present */
937 set_media_not_present(sdkp
);
942 * spinup disk - called only in sd_revalidate_disk()
945 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
947 unsigned char cmd
[10];
948 unsigned long spintime_expire
= 0;
949 int retries
, spintime
;
950 unsigned int the_result
;
951 struct scsi_sense_hdr sshdr
;
956 /* Spin up drives, as required. Only do this at boot time */
957 /* Spinup needs to be done for module loads too. */
962 cmd
[0] = TEST_UNIT_READY
;
963 memset((void *) &cmd
[1], 0, 9);
965 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
971 sense_valid
= scsi_sense_valid(&sshdr
);
973 } while (retries
< 3 &&
974 (!scsi_status_is_good(the_result
) ||
975 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
976 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
979 * If the drive has indicated to us that it doesn't have
980 * any media in it, don't bother with any of the rest of
983 if (media_not_present(sdkp
, &sshdr
))
986 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
987 /* no sense, TUR either succeeded or failed
988 * with a status error */
989 if(!spintime
&& !scsi_status_is_good(the_result
))
990 printk(KERN_NOTICE
"%s: Unit Not Ready, "
991 "error = 0x%x\n", diskname
, the_result
);
996 * The device does not want the automatic start to be issued.
998 if (sdkp
->device
->no_start_on_add
) {
1003 * If manual intervention is required, or this is an
1004 * absent USB storage device, a spinup is meaningless.
1007 sshdr
.sense_key
== NOT_READY
&&
1008 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1009 break; /* manual intervention required */
1012 * Issue command to spin up drive when not ready
1014 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1016 printk(KERN_NOTICE
"%s: Spinning up disk...",
1018 cmd
[0] = START_STOP
;
1019 cmd
[1] = 1; /* Return immediately */
1020 memset((void *) &cmd
[2], 0, 8);
1021 cmd
[4] = 1; /* Start spin cycle */
1022 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1024 SD_TIMEOUT
, SD_MAX_RETRIES
);
1025 spintime_expire
= jiffies
+ 100 * HZ
;
1028 /* Wait 1 second for next try */
1033 * Wait for USB flash devices with slow firmware.
1034 * Yes, this sense key/ASC combination shouldn't
1035 * occur here. It's characteristic of these devices.
1037 } else if (sense_valid
&&
1038 sshdr
.sense_key
== UNIT_ATTENTION
&&
1039 sshdr
.asc
== 0x28) {
1041 spintime_expire
= jiffies
+ 5 * HZ
;
1044 /* Wait 1 second for next try */
1047 /* we don't understand the sense code, so it's
1048 * probably pointless to loop */
1050 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1051 "sense:\n", diskname
);
1052 scsi_print_sense_hdr("", &sshdr
);
1057 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1060 if (scsi_status_is_good(the_result
))
1063 printk("not responding...\n");
1068 * read disk capacity
1071 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1072 unsigned char *buffer
)
1074 unsigned char cmd
[16];
1075 int the_result
, retries
;
1076 int sector_size
= 0;
1078 struct scsi_sense_hdr sshdr
;
1079 int sense_valid
= 0;
1080 struct scsi_device
*sdp
= sdkp
->device
;
1086 memset((void *) cmd
, 0, 16);
1087 cmd
[0] = SERVICE_ACTION_IN
;
1088 cmd
[1] = SAI_READ_CAPACITY_16
;
1090 memset((void *) buffer
, 0, 12);
1092 cmd
[0] = READ_CAPACITY
;
1093 memset((void *) &cmd
[1], 0, 9);
1094 memset((void *) buffer
, 0, 8);
1097 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1098 buffer
, longrc
? 12 : 8, &sshdr
,
1099 SD_TIMEOUT
, SD_MAX_RETRIES
);
1101 if (media_not_present(sdkp
, &sshdr
))
1105 sense_valid
= scsi_sense_valid(&sshdr
);
1108 } while (the_result
&& retries
);
1110 if (the_result
&& !longrc
) {
1111 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1112 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1114 status_byte(the_result
),
1115 msg_byte(the_result
),
1116 host_byte(the_result
),
1117 driver_byte(the_result
));
1119 if (driver_byte(the_result
) & DRIVER_SENSE
)
1120 scsi_print_sense_hdr("sd", &sshdr
);
1122 printk("%s : sense not available. \n", diskname
);
1124 /* Set dirty bit for removable devices if not ready -
1125 * sometimes drives will not report this properly. */
1126 if (sdp
->removable
&&
1127 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1130 /* Either no media are present but the drive didn't tell us,
1131 or they are present but the read capacity command fails */
1132 /* sdkp->media_present = 0; -- not always correct */
1133 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1136 } else if (the_result
&& longrc
) {
1137 /* READ CAPACITY(16) has been failed */
1138 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1139 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1141 status_byte(the_result
),
1142 msg_byte(the_result
),
1143 host_byte(the_result
),
1144 driver_byte(the_result
));
1145 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1148 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1153 sector_size
= (buffer
[4] << 24) |
1154 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1155 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1156 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1157 if(sizeof(sdkp
->capacity
) > 4) {
1158 printk(KERN_NOTICE
"%s : very big device. try to use"
1159 " READ CAPACITY(16).\n", diskname
);
1163 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1164 "kernel compiled with support for large block "
1165 "devices.\n", diskname
);
1169 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1174 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1175 ((u64
)buffer
[1] << 48) |
1176 ((u64
)buffer
[2] << 40) |
1177 ((u64
)buffer
[3] << 32) |
1178 ((sector_t
)buffer
[4] << 24) |
1179 ((sector_t
)buffer
[5] << 16) |
1180 ((sector_t
)buffer
[6] << 8) |
1181 (sector_t
)buffer
[7]);
1183 sector_size
= (buffer
[8] << 24) |
1184 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1187 /* Some devices return the total number of sectors, not the
1188 * highest sector number. Make the necessary adjustment. */
1189 if (sdp
->fix_capacity
)
1193 if (sector_size
== 0) {
1195 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1196 "assuming 512.\n", diskname
);
1199 if (sector_size
!= 512 &&
1200 sector_size
!= 1024 &&
1201 sector_size
!= 2048 &&
1202 sector_size
!= 4096 &&
1203 sector_size
!= 256) {
1204 printk(KERN_NOTICE
"%s : unsupported sector size "
1205 "%d.\n", diskname
, sector_size
);
1207 * The user might want to re-format the drive with
1208 * a supported sectorsize. Once this happens, it
1209 * would be relatively trivial to set the thing up.
1210 * For this reason, we leave the thing in the table.
1214 * set a bogus sector size so the normal read/write
1215 * logic in the block layer will eventually refuse any
1216 * request on this device without tripping over power
1217 * of two sector size assumptions
1223 * The msdos fs needs to know the hardware sector size
1224 * So I have created this table. See ll_rw_blk.c
1225 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1227 int hard_sector
= sector_size
;
1228 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1229 request_queue_t
*queue
= sdp
->request_queue
;
1232 blk_queue_hardsect_size(queue
, hard_sector
);
1233 /* avoid 64-bit division on 32-bit platforms */
1234 sector_div(sz
, 625);
1236 sector_div(mb
, 1950);
1238 printk(KERN_NOTICE
"SCSI device %s: "
1239 "%llu %d-byte hdwr sectors (%llu MB)\n",
1240 diskname
, (unsigned long long)sdkp
->capacity
,
1241 hard_sector
, (unsigned long long)mb
);
1244 /* Rescale capacity to 512-byte units */
1245 if (sector_size
== 4096)
1246 sdkp
->capacity
<<= 3;
1247 else if (sector_size
== 2048)
1248 sdkp
->capacity
<<= 2;
1249 else if (sector_size
== 1024)
1250 sdkp
->capacity
<<= 1;
1251 else if (sector_size
== 256)
1252 sdkp
->capacity
>>= 1;
1254 sdkp
->device
->sector_size
= sector_size
;
1257 /* called with buffer of length 512 */
1259 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1260 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1261 struct scsi_sense_hdr
*sshdr
)
1263 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1264 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1269 * read write protect setting, if possible - called only in sd_revalidate_disk()
1270 * called with buffer of length 512
1273 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1274 unsigned char *buffer
)
1277 struct scsi_device
*sdp
= sdkp
->device
;
1278 struct scsi_mode_data data
;
1280 set_disk_ro(sdkp
->disk
, 0);
1281 if (sdp
->skip_ms_page_3f
) {
1282 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1286 if (sdp
->use_192_bytes_for_3f
) {
1287 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1290 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1291 * We have to start carefully: some devices hang if we ask
1292 * for more than is available.
1294 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1297 * Second attempt: ask for page 0 When only page 0 is
1298 * implemented, a request for page 3F may return Sense Key
1299 * 5: Illegal Request, Sense Code 24: Invalid field in
1302 if (!scsi_status_is_good(res
))
1303 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1306 * Third attempt: ask 255 bytes, as we did earlier.
1308 if (!scsi_status_is_good(res
))
1309 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1313 if (!scsi_status_is_good(res
)) {
1315 "%s: test WP failed, assume Write Enabled\n", diskname
);
1317 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1318 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1319 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1320 sdkp
->write_prot
? "on" : "off");
1321 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1322 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1327 * sd_read_cache_type - called only from sd_revalidate_disk()
1328 * called with buffer of length 512
1331 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1332 unsigned char *buffer
)
1335 struct scsi_device
*sdp
= sdkp
->device
;
1339 struct scsi_mode_data data
;
1340 struct scsi_sense_hdr sshdr
;
1342 if (sdp
->skip_ms_page_8
)
1345 if (sdp
->type
== TYPE_RBC
) {
1353 /* cautiously ask */
1354 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1356 if (!scsi_status_is_good(res
))
1359 /* that went OK, now ask for the proper length */
1363 * We're only interested in the first three bytes, actually.
1364 * But the data cache page is defined for the first 20.
1371 /* Take headers and block descriptors into account */
1372 len
+= data
.header_length
+ data
.block_descriptor_length
;
1375 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1377 if (scsi_status_is_good(res
)) {
1378 const char *types
[] = {
1379 "write through", "none", "write back",
1380 "write back, no read (daft)"
1383 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1385 if ((buffer
[offset
] & 0x3f) != modepage
) {
1386 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1390 if (modepage
== 8) {
1391 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1392 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1394 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1398 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1400 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s\n",
1401 diskname
, types
[ct
]);
1407 if (scsi_sense_valid(&sshdr
) &&
1408 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1409 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1410 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1411 diskname
); /* Invalid field in CDB */
1413 printk(KERN_ERR
"%s: asking for cache data failed\n",
1417 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1424 * sd_revalidate_disk - called the first time a new disk is seen,
1425 * performs disk spin up, read_capacity, etc.
1426 * @disk: struct gendisk we care about
1428 static int sd_revalidate_disk(struct gendisk
*disk
)
1430 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1431 struct scsi_device
*sdp
= sdkp
->device
;
1432 unsigned char *buffer
;
1435 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1438 * If the device is offline, don't try and read capacity or any
1439 * of the other niceties.
1441 if (!scsi_device_online(sdp
))
1444 buffer
= kmalloc(512, GFP_KERNEL
| __GFP_DMA
);
1446 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1451 /* defaults, until the device tells us otherwise */
1452 sdp
->sector_size
= 512;
1454 sdkp
->media_present
= 1;
1455 sdkp
->write_prot
= 0;
1459 sd_spinup_disk(sdkp
, disk
->disk_name
);
1462 * Without media there is no reason to ask; moreover, some devices
1463 * react badly if we do.
1465 if (sdkp
->media_present
) {
1466 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1467 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1468 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1472 * We now have all cache related info, determine how we deal
1473 * with ordered requests. Note that as the current SCSI
1474 * dispatch function can alter request order, we cannot use
1475 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1478 ordered
= QUEUE_ORDERED_DRAIN_FLUSH
;
1480 ordered
= QUEUE_ORDERED_DRAIN
;
1482 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1484 set_capacity(disk
, sdkp
->capacity
);
1492 * sd_probe - called during driver initialization and whenever a
1493 * new scsi device is attached to the system. It is called once
1494 * for each scsi device (not just disks) present.
1495 * @dev: pointer to device object
1497 * Returns 0 if successful (or not interested in this scsi device
1498 * (e.g. scanner)); 1 when there is an error.
1500 * Note: this function is invoked from the scsi mid-level.
1501 * This function sets up the mapping between a given
1502 * <host,channel,id,lun> (found in sdp) and new device name
1503 * (e.g. /dev/sda). More precisely it is the block device major
1504 * and minor number that is chosen here.
1506 * Assume sd_attach is not re-entrant (for time being)
1507 * Also think about sd_attach() and sd_remove() running coincidentally.
1509 static int sd_probe(struct device
*dev
)
1511 struct scsi_device
*sdp
= to_scsi_device(dev
);
1512 struct scsi_disk
*sdkp
;
1518 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1521 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1525 sdkp
= kmalloc(sizeof(*sdkp
), GFP_KERNEL
);
1529 memset (sdkp
, 0, sizeof(*sdkp
));
1530 kref_init(&sdkp
->kref
);
1532 gd
= alloc_disk(16);
1536 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1539 spin_lock(&sd_index_lock
);
1540 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1541 spin_unlock(&sd_index_lock
);
1543 if (index
>= SD_MAX_DISKS
)
1548 get_device(&sdp
->sdev_gendev
);
1550 sdkp
->driver
= &sd_template
;
1552 sdkp
->index
= index
;
1555 if (!sdp
->timeout
) {
1556 if (sdp
->type
!= TYPE_MOD
)
1557 sdp
->timeout
= SD_TIMEOUT
;
1559 sdp
->timeout
= SD_MOD_TIMEOUT
;
1562 gd
->major
= sd_major((index
& 0xf0) >> 4);
1563 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1565 gd
->fops
= &sd_fops
;
1568 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1569 } else if (index
< (26 + 1) * 26) {
1570 sprintf(gd
->disk_name
, "sd%c%c",
1571 'a' + index
/ 26 - 1,'a' + index
% 26);
1573 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1574 const unsigned int m2
= (index
/ 26 - 1) % 26;
1575 const unsigned int m3
= index
% 26;
1576 sprintf(gd
->disk_name
, "sd%c%c%c",
1577 'a' + m1
, 'a' + m2
, 'a' + m3
);
1580 strcpy(gd
->devfs_name
, sdp
->devfs_name
);
1582 gd
->private_data
= &sdkp
->driver
;
1583 gd
->queue
= sdkp
->device
->request_queue
;
1585 sd_revalidate_disk(gd
);
1587 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1588 gd
->flags
= GENHD_FL_DRIVERFS
;
1590 gd
->flags
|= GENHD_FL_REMOVABLE
;
1592 dev_set_drvdata(dev
, sdkp
);
1595 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1596 sdp
->removable
? "removable " : "", gd
->disk_name
);
1609 * sd_remove - called whenever a scsi disk (previously recognized by
1610 * sd_probe) is detached from the system. It is called (potentially
1611 * multiple times) during sd module unload.
1612 * @sdp: pointer to mid level scsi device object
1614 * Note: this function is invoked from the scsi mid-level.
1615 * This function potentially frees up a device name (e.g. /dev/sdc)
1616 * that could be re-used by a subsequent sd_probe().
1617 * This function is not called when the built-in sd driver is "exit-ed".
1619 static int sd_remove(struct device
*dev
)
1621 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1623 del_gendisk(sdkp
->disk
);
1627 dev_set_drvdata(dev
, NULL
);
1628 kref_put(&sdkp
->kref
, scsi_disk_release
);
1635 * scsi_disk_release - Called to free the scsi_disk structure
1636 * @kref: pointer to embedded kref
1638 * sd_ref_sem must be held entering this routine. Because it is
1639 * called on last put, you should always use the scsi_disk_get()
1640 * scsi_disk_put() helpers which manipulate the semaphore directly
1641 * and never do a direct kref_put().
1643 static void scsi_disk_release(struct kref
*kref
)
1645 struct scsi_disk
*sdkp
= to_scsi_disk(kref
);
1646 struct gendisk
*disk
= sdkp
->disk
;
1648 spin_lock(&sd_index_lock
);
1649 idr_remove(&sd_index_idr
, sdkp
->index
);
1650 spin_unlock(&sd_index_lock
);
1652 disk
->private_data
= NULL
;
1654 put_device(&sdkp
->device
->sdev_gendev
);
1660 * Send a SYNCHRONIZE CACHE instruction down to the device through
1661 * the normal SCSI command structure. Wait for the command to
1664 static void sd_shutdown(struct device
*dev
)
1666 struct scsi_device
*sdp
= to_scsi_device(dev
);
1667 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1670 return; /* this can happen */
1673 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1674 sdkp
->disk
->disk_name
);
1677 scsi_disk_put(sdkp
);
1681 * init_sd - entry point for this driver (both when built in or when
1684 * Note: this function registers this driver with the scsi mid-level.
1686 static int __init
init_sd(void)
1690 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1692 for (i
= 0; i
< SD_MAJORS
; i
++)
1693 if (register_blkdev(sd_major(i
), "sd") == 0)
1699 return scsi_register_driver(&sd_template
.gendrv
);
1703 * exit_sd - exit point for this driver (when it is a module).
1705 * Note: this function unregisters this driver from the scsi mid-level.
1707 static void __exit
exit_sd(void)
1711 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1713 scsi_unregister_driver(&sd_template
.gendrv
);
1714 for (i
= 0; i
< SD_MAJORS
; i
++)
1715 unregister_blkdev(sd_major(i
), "sd");
1718 MODULE_LICENSE("GPL");
1719 MODULE_AUTHOR("Eric Youngdale");
1720 MODULE_DESCRIPTION("SCSI disk (sd) driver");
1722 module_init(init_sd
);
1723 module_exit(exit_sd
);