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 unsigned int this_count
, timeout
;
236 struct gendisk
*disk
;
238 struct scsi_device
*sdp
= SCpnt
->device
;
239 struct request
*rq
= SCpnt
->request
;
241 timeout
= sdp
->timeout
;
244 * SG_IO from block layer already setup, just copy cdb basically
246 if (blk_pc_request(rq
)) {
247 scsi_setup_blk_pc_cmnd(SCpnt
);
249 timeout
= rq
->timeout
;
255 * we only do REQ_CMD and REQ_BLOCK_PC
257 if (!blk_fs_request(rq
))
262 this_count
= SCpnt
->request_bufflen
>> 9;
264 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
265 "count=%d\n", disk
->disk_name
,
266 (unsigned long long)block
, this_count
));
268 if (!sdp
|| !scsi_device_online(sdp
) ||
269 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
270 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
272 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
278 * quietly refuse to do anything to a changed disc until
279 * the changed bit has been reset
281 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
284 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
285 disk
->disk_name
, (unsigned long long)block
));
288 * If we have a 1K hardware sectorsize, prevent access to single
289 * 512 byte sectors. In theory we could handle this - in fact
290 * the scsi cdrom driver must be able to handle this because
291 * we typically use 1K blocksizes, and cdroms typically have
292 * 2K hardware sectorsizes. Of course, things are simpler
293 * with the cdrom, since it is read-only. For performance
294 * reasons, the filesystems should be able to handle this
295 * and not force the scsi disk driver to use bounce buffers
298 if (sdp
->sector_size
== 1024) {
299 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
300 printk(KERN_ERR
"sd: Bad block number requested");
304 this_count
= this_count
>> 1;
307 if (sdp
->sector_size
== 2048) {
308 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
309 printk(KERN_ERR
"sd: Bad block number requested");
313 this_count
= this_count
>> 2;
316 if (sdp
->sector_size
== 4096) {
317 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
318 printk(KERN_ERR
"sd: Bad block number requested");
322 this_count
= this_count
>> 3;
325 if (rq_data_dir(rq
) == WRITE
) {
326 if (!sdp
->writeable
) {
329 SCpnt
->cmnd
[0] = WRITE_6
;
330 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
331 } else if (rq_data_dir(rq
) == READ
) {
332 SCpnt
->cmnd
[0] = READ_6
;
333 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
335 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
336 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
340 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
341 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
342 "writing" : "reading", this_count
, rq
->nr_sectors
));
346 if (block
> 0xffffffff) {
347 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
348 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
349 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
350 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
351 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
352 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
353 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
354 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
355 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
356 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
357 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
358 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
359 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
360 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
361 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
362 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
363 SCpnt
->device
->use_10_for_rw
) {
364 if (this_count
> 0xffff)
367 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
368 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
369 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
370 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
371 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
372 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
373 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
374 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
375 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
377 if (unlikely(blk_fua_rq(rq
))) {
379 * This happens only if this drive failed
380 * 10byte rw command with ILLEGAL_REQUEST
381 * during operation and thus turned off
384 printk(KERN_ERR
"sd: FUA write on READ/WRITE(6) drive\n");
388 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
389 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
390 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
391 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
394 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
395 this_count
* sdp
->sector_size
;
398 * We shouldn't disconnect in the middle of a sector, so with a dumb
399 * host adapter, it's safe to assume that we can at least transfer
400 * this many bytes between each connect / disconnect.
402 SCpnt
->transfersize
= sdp
->sector_size
;
403 SCpnt
->underflow
= this_count
<< 9;
404 SCpnt
->allowed
= SD_MAX_RETRIES
;
407 SCpnt
->timeout_per_command
= timeout
;
410 * This is the completion routine we use. This is matched in terms
411 * of capability to this function.
413 SCpnt
->done
= sd_rw_intr
;
416 * This indicates that the command is ready from our end to be
423 * sd_open - open a scsi disk device
424 * @inode: only i_rdev member may be used
425 * @filp: only f_mode and f_flags may be used
427 * Returns 0 if successful. Returns a negated errno value in case
430 * Note: This can be called from a user context (e.g. fsck(1) )
431 * or from within the kernel (e.g. as a result of a mount(1) ).
432 * In the latter case @inode and @filp carry an abridged amount
433 * of information as noted above.
435 static int sd_open(struct inode
*inode
, struct file
*filp
)
437 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
438 struct scsi_disk
*sdkp
;
439 struct scsi_device
*sdev
;
442 if (!(sdkp
= scsi_disk_get(disk
)))
446 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
451 * If the device is in error recovery, wait until it is done.
452 * If the device is offline, then disallow any access to it.
455 if (!scsi_block_when_processing_errors(sdev
))
458 if (sdev
->removable
|| sdkp
->write_prot
)
459 check_disk_change(inode
->i_bdev
);
462 * If the drive is empty, just let the open fail.
465 if (sdev
->removable
&& !sdkp
->media_present
&&
466 !(filp
->f_flags
& O_NDELAY
))
470 * If the device has the write protect tab set, have the open fail
471 * if the user expects to be able to write to the thing.
474 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
478 * It is possible that the disk changing stuff resulted in
479 * the device being taken offline. If this is the case,
480 * report this to the user, and don't pretend that the
481 * open actually succeeded.
484 if (!scsi_device_online(sdev
))
487 if (!sdkp
->openers
++ && sdev
->removable
) {
488 if (scsi_block_when_processing_errors(sdev
))
489 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
500 * sd_release - invoked when the (last) close(2) is called on this
502 * @inode: only i_rdev member may be used
503 * @filp: only f_mode and f_flags may be used
507 * Note: may block (uninterruptible) if error recovery is underway
510 static int sd_release(struct inode
*inode
, struct file
*filp
)
512 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
513 struct scsi_disk
*sdkp
= scsi_disk(disk
);
514 struct scsi_device
*sdev
= sdkp
->device
;
516 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
518 if (!--sdkp
->openers
&& sdev
->removable
) {
519 if (scsi_block_when_processing_errors(sdev
))
520 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
524 * XXX and what if there are packets in flight and this close()
525 * XXX is followed by a "rmmod sd_mod"?
531 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
533 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
534 struct scsi_device
*sdp
= sdkp
->device
;
535 struct Scsi_Host
*host
= sdp
->host
;
538 /* default to most commonly used values */
539 diskinfo
[0] = 0x40; /* 1 << 6 */
540 diskinfo
[1] = 0x20; /* 1 << 5 */
541 diskinfo
[2] = sdkp
->capacity
>> 11;
543 /* override with calculated, extended default, or driver values */
544 if (host
->hostt
->bios_param
)
545 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
547 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
549 geo
->heads
= diskinfo
[0];
550 geo
->sectors
= diskinfo
[1];
551 geo
->cylinders
= diskinfo
[2];
556 * sd_ioctl - process an ioctl
557 * @inode: only i_rdev/i_bdev members may be used
558 * @filp: only f_mode and f_flags may be used
559 * @cmd: ioctl command number
560 * @arg: this is third argument given to ioctl(2) system call.
561 * Often contains a pointer.
563 * Returns 0 if successful (some ioctls return postive numbers on
564 * success as well). Returns a negated errno value in case of error.
566 * Note: most ioctls are forward onto the block subsystem or further
567 * down in the scsi subsytem.
569 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
570 unsigned int cmd
, unsigned long arg
)
572 struct block_device
*bdev
= inode
->i_bdev
;
573 struct gendisk
*disk
= bdev
->bd_disk
;
574 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
575 void __user
*p
= (void __user
*)arg
;
578 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
579 disk
->disk_name
, cmd
));
582 * If we are in the middle of error recovery, don't let anyone
583 * else try and use this device. Also, if error recovery fails, it
584 * may try and take the device offline, in which case all further
585 * access to the device is prohibited.
587 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
588 if (!scsi_block_when_processing_errors(sdp
) || !error
)
592 * Send SCSI addressing ioctls directly to mid level, send other
593 * ioctls to block level and then onto mid level if they can't be
597 case SCSI_IOCTL_GET_IDLUN
:
598 case SCSI_IOCTL_GET_BUS_NUMBER
:
599 return scsi_ioctl(sdp
, cmd
, p
);
601 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
602 if (error
!= -ENOTTY
)
605 return scsi_ioctl(sdp
, cmd
, p
);
608 static void set_media_not_present(struct scsi_disk
*sdkp
)
610 sdkp
->media_present
= 0;
612 sdkp
->device
->changed
= 1;
616 * sd_media_changed - check if our medium changed
617 * @disk: kernel device descriptor
619 * Returns 0 if not applicable or no change; 1 if change
621 * Note: this function is invoked from the block subsystem.
623 static int sd_media_changed(struct gendisk
*disk
)
625 struct scsi_disk
*sdkp
= scsi_disk(disk
);
626 struct scsi_device
*sdp
= sdkp
->device
;
629 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
636 * If the device is offline, don't send any commands - just pretend as
637 * if the command failed. If the device ever comes back online, we
638 * can deal with it then. It is only because of unrecoverable errors
639 * that we would ever take a device offline in the first place.
641 if (!scsi_device_online(sdp
))
645 * Using TEST_UNIT_READY enables differentiation between drive with
646 * no cartridge loaded - NOT READY, drive with changed cartridge -
647 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
649 * Drives that auto spin down. eg iomega jaz 1G, will be started
650 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
651 * sd_revalidate() is called.
654 if (scsi_block_when_processing_errors(sdp
))
655 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
658 * Unable to test, unit probably not ready. This usually
659 * means there is no disc in the drive. Mark as changed,
660 * and we will figure it out later once the drive is
667 * For removable scsi disk we have to recognise the presence
668 * of a disk in the drive. This is kept in the struct scsi_disk
669 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
671 sdkp
->media_present
= 1;
673 retval
= sdp
->changed
;
679 set_media_not_present(sdkp
);
683 static int sd_sync_cache(struct scsi_device
*sdp
)
686 struct scsi_sense_hdr sshdr
;
688 if (!scsi_device_online(sdp
))
692 for (retries
= 3; retries
> 0; --retries
) {
693 unsigned char cmd
[10] = { 0 };
695 cmd
[0] = SYNCHRONIZE_CACHE
;
697 * Leave the rest of the command zero to indicate
700 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
701 SD_TIMEOUT
, SD_MAX_RETRIES
);
706 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
707 "host = %d, driver = %02x\n ",
708 status_byte(res
), msg_byte(res
),
709 host_byte(res
), driver_byte(res
));
710 if (driver_byte(res
) & DRIVER_SENSE
)
711 scsi_print_sense_hdr("sd", &sshdr
);
717 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
720 struct scsi_device
*sdp
= to_scsi_device(dev
);
721 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
727 ret
= sd_sync_cache(sdp
);
732 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
734 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
735 rq
->flags
|= REQ_BLOCK_PC
;
736 rq
->timeout
= SD_TIMEOUT
;
737 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
741 static void sd_rescan(struct device
*dev
)
743 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
746 sd_revalidate_disk(sdkp
->disk
);
754 * This gets directly called from VFS. When the ioctl
755 * is not recognized we go back to the other translation paths.
757 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
759 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
760 struct gendisk
*disk
= bdev
->bd_disk
;
761 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
764 * If we are in the middle of error recovery, don't let anyone
765 * else try and use this device. Also, if error recovery fails, it
766 * may try and take the device offline, in which case all further
767 * access to the device is prohibited.
769 if (!scsi_block_when_processing_errors(sdev
))
772 if (sdev
->host
->hostt
->compat_ioctl
) {
775 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
781 * Let the static ioctl translation table take care of it.
787 static struct block_device_operations sd_fops
= {
788 .owner
= THIS_MODULE
,
790 .release
= sd_release
,
794 .compat_ioctl
= sd_compat_ioctl
,
796 .media_changed
= sd_media_changed
,
797 .revalidate_disk
= sd_revalidate_disk
,
801 * sd_rw_intr - bottom half handler: called when the lower level
802 * driver has completed (successfully or otherwise) a scsi command.
803 * @SCpnt: mid-level's per command structure.
805 * Note: potentially run from within an ISR. Must not block.
807 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
809 int result
= SCpnt
->result
;
810 int this_count
= SCpnt
->bufflen
;
811 int good_bytes
= (result
== 0 ? this_count
: 0);
812 sector_t block_sectors
= 1;
814 sector_t error_sector
;
815 struct scsi_sense_hdr sshdr
;
817 int sense_deferred
= 0;
821 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
823 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
826 #ifdef CONFIG_SCSI_LOGGING
827 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
828 SCpnt
->request
->rq_disk
->disk_name
, result
));
830 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
831 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
832 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
836 Handle MEDIUM ERRORs that indicate partial success. Since this is a
837 relatively rare error condition, no care is taken to avoid
838 unnecessary additional work such as memcpy's that could be avoided.
842 * If SG_IO from block layer then set good_bytes to stop retries;
843 * else if errors, check them, and if necessary prepare for
846 if (blk_pc_request(SCpnt
->request
))
847 good_bytes
= this_count
;
848 else if (driver_byte(result
) != 0 &&
849 sense_valid
&& !sense_deferred
) {
850 switch (sshdr
.sense_key
) {
852 if (!blk_fs_request(SCpnt
->request
))
854 info_valid
= scsi_get_sense_info_fld(
855 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
858 * May want to warn and skip if following cast results
859 * in actual truncation (if sector_t < 64 bits)
861 error_sector
= (sector_t
)first_err_block
;
862 if (SCpnt
->request
->bio
!= NULL
)
863 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
864 switch (SCpnt
->device
->sector_size
) {
867 if (block_sectors
< 2)
872 if (block_sectors
< 4)
877 if (block_sectors
< 8)
887 error_sector
&= ~(block_sectors
- 1);
888 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
889 if (good_bytes
< 0 || good_bytes
>= this_count
)
893 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
894 case NO_SENSE
: /* LLDD got sense data */
896 * Inform the user, but make sure that it's not treated
899 scsi_print_sense("sd", SCpnt
);
901 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
902 good_bytes
= this_count
;
905 case ILLEGAL_REQUEST
:
906 if (SCpnt
->device
->use_10_for_rw
&&
907 (SCpnt
->cmnd
[0] == READ_10
||
908 SCpnt
->cmnd
[0] == WRITE_10
))
909 SCpnt
->device
->use_10_for_rw
= 0;
910 if (SCpnt
->device
->use_10_for_ms
&&
911 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
912 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
913 SCpnt
->device
->use_10_for_ms
= 0;
921 * This calls the generic completion function, now that we know
922 * how many actual sectors finished, and how many sectors we need
923 * to say have failed.
925 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
928 static int media_not_present(struct scsi_disk
*sdkp
,
929 struct scsi_sense_hdr
*sshdr
)
932 if (!scsi_sense_valid(sshdr
))
934 /* not invoked for commands that could return deferred errors */
935 if (sshdr
->sense_key
!= NOT_READY
&&
936 sshdr
->sense_key
!= UNIT_ATTENTION
)
938 if (sshdr
->asc
!= 0x3A) /* medium not present */
941 set_media_not_present(sdkp
);
946 * spinup disk - called only in sd_revalidate_disk()
949 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
951 unsigned char cmd
[10];
952 unsigned long spintime_expire
= 0;
953 int retries
, spintime
;
954 unsigned int the_result
;
955 struct scsi_sense_hdr sshdr
;
960 /* Spin up drives, as required. Only do this at boot time */
961 /* Spinup needs to be done for module loads too. */
966 cmd
[0] = TEST_UNIT_READY
;
967 memset((void *) &cmd
[1], 0, 9);
969 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
975 sense_valid
= scsi_sense_valid(&sshdr
);
977 } while (retries
< 3 &&
978 (!scsi_status_is_good(the_result
) ||
979 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
980 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
983 * If the drive has indicated to us that it doesn't have
984 * any media in it, don't bother with any of the rest of
987 if (media_not_present(sdkp
, &sshdr
))
990 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
991 /* no sense, TUR either succeeded or failed
992 * with a status error */
993 if(!spintime
&& !scsi_status_is_good(the_result
))
994 printk(KERN_NOTICE
"%s: Unit Not Ready, "
995 "error = 0x%x\n", diskname
, the_result
);
1000 * The device does not want the automatic start to be issued.
1002 if (sdkp
->device
->no_start_on_add
) {
1007 * If manual intervention is required, or this is an
1008 * absent USB storage device, a spinup is meaningless.
1011 sshdr
.sense_key
== NOT_READY
&&
1012 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1013 break; /* manual intervention required */
1016 * Issue command to spin up drive when not ready
1018 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1020 printk(KERN_NOTICE
"%s: Spinning up disk...",
1022 cmd
[0] = START_STOP
;
1023 cmd
[1] = 1; /* Return immediately */
1024 memset((void *) &cmd
[2], 0, 8);
1025 cmd
[4] = 1; /* Start spin cycle */
1026 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1028 SD_TIMEOUT
, SD_MAX_RETRIES
);
1029 spintime_expire
= jiffies
+ 100 * HZ
;
1032 /* Wait 1 second for next try */
1037 * Wait for USB flash devices with slow firmware.
1038 * Yes, this sense key/ASC combination shouldn't
1039 * occur here. It's characteristic of these devices.
1041 } else if (sense_valid
&&
1042 sshdr
.sense_key
== UNIT_ATTENTION
&&
1043 sshdr
.asc
== 0x28) {
1045 spintime_expire
= jiffies
+ 5 * HZ
;
1048 /* Wait 1 second for next try */
1051 /* we don't understand the sense code, so it's
1052 * probably pointless to loop */
1054 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1055 "sense:\n", diskname
);
1056 scsi_print_sense_hdr("", &sshdr
);
1061 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1064 if (scsi_status_is_good(the_result
))
1067 printk("not responding...\n");
1072 * read disk capacity
1075 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1076 unsigned char *buffer
)
1078 unsigned char cmd
[16];
1079 int the_result
, retries
;
1080 int sector_size
= 0;
1082 struct scsi_sense_hdr sshdr
;
1083 int sense_valid
= 0;
1084 struct scsi_device
*sdp
= sdkp
->device
;
1090 memset((void *) cmd
, 0, 16);
1091 cmd
[0] = SERVICE_ACTION_IN
;
1092 cmd
[1] = SAI_READ_CAPACITY_16
;
1094 memset((void *) buffer
, 0, 12);
1096 cmd
[0] = READ_CAPACITY
;
1097 memset((void *) &cmd
[1], 0, 9);
1098 memset((void *) buffer
, 0, 8);
1101 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1102 buffer
, longrc
? 12 : 8, &sshdr
,
1103 SD_TIMEOUT
, SD_MAX_RETRIES
);
1105 if (media_not_present(sdkp
, &sshdr
))
1109 sense_valid
= scsi_sense_valid(&sshdr
);
1112 } while (the_result
&& retries
);
1114 if (the_result
&& !longrc
) {
1115 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1116 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1118 status_byte(the_result
),
1119 msg_byte(the_result
),
1120 host_byte(the_result
),
1121 driver_byte(the_result
));
1123 if (driver_byte(the_result
) & DRIVER_SENSE
)
1124 scsi_print_sense_hdr("sd", &sshdr
);
1126 printk("%s : sense not available. \n", diskname
);
1128 /* Set dirty bit for removable devices if not ready -
1129 * sometimes drives will not report this properly. */
1130 if (sdp
->removable
&&
1131 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1134 /* Either no media are present but the drive didn't tell us,
1135 or they are present but the read capacity command fails */
1136 /* sdkp->media_present = 0; -- not always correct */
1137 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1140 } else if (the_result
&& longrc
) {
1141 /* READ CAPACITY(16) has been failed */
1142 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1143 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1145 status_byte(the_result
),
1146 msg_byte(the_result
),
1147 host_byte(the_result
),
1148 driver_byte(the_result
));
1149 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1152 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1157 sector_size
= (buffer
[4] << 24) |
1158 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1159 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1160 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1161 if(sizeof(sdkp
->capacity
) > 4) {
1162 printk(KERN_NOTICE
"%s : very big device. try to use"
1163 " READ CAPACITY(16).\n", diskname
);
1167 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1168 "kernel compiled with support for large block "
1169 "devices.\n", diskname
);
1173 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1178 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1179 ((u64
)buffer
[1] << 48) |
1180 ((u64
)buffer
[2] << 40) |
1181 ((u64
)buffer
[3] << 32) |
1182 ((sector_t
)buffer
[4] << 24) |
1183 ((sector_t
)buffer
[5] << 16) |
1184 ((sector_t
)buffer
[6] << 8) |
1185 (sector_t
)buffer
[7]);
1187 sector_size
= (buffer
[8] << 24) |
1188 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1191 /* Some devices return the total number of sectors, not the
1192 * highest sector number. Make the necessary adjustment. */
1193 if (sdp
->fix_capacity
)
1197 if (sector_size
== 0) {
1199 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1200 "assuming 512.\n", diskname
);
1203 if (sector_size
!= 512 &&
1204 sector_size
!= 1024 &&
1205 sector_size
!= 2048 &&
1206 sector_size
!= 4096 &&
1207 sector_size
!= 256) {
1208 printk(KERN_NOTICE
"%s : unsupported sector size "
1209 "%d.\n", diskname
, sector_size
);
1211 * The user might want to re-format the drive with
1212 * a supported sectorsize. Once this happens, it
1213 * would be relatively trivial to set the thing up.
1214 * For this reason, we leave the thing in the table.
1218 * set a bogus sector size so the normal read/write
1219 * logic in the block layer will eventually refuse any
1220 * request on this device without tripping over power
1221 * of two sector size assumptions
1227 * The msdos fs needs to know the hardware sector size
1228 * So I have created this table. See ll_rw_blk.c
1229 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1231 int hard_sector
= sector_size
;
1232 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1233 request_queue_t
*queue
= sdp
->request_queue
;
1236 blk_queue_hardsect_size(queue
, hard_sector
);
1237 /* avoid 64-bit division on 32-bit platforms */
1238 sector_div(sz
, 625);
1240 sector_div(mb
, 1950);
1242 printk(KERN_NOTICE
"SCSI device %s: "
1243 "%llu %d-byte hdwr sectors (%llu MB)\n",
1244 diskname
, (unsigned long long)sdkp
->capacity
,
1245 hard_sector
, (unsigned long long)mb
);
1248 /* Rescale capacity to 512-byte units */
1249 if (sector_size
== 4096)
1250 sdkp
->capacity
<<= 3;
1251 else if (sector_size
== 2048)
1252 sdkp
->capacity
<<= 2;
1253 else if (sector_size
== 1024)
1254 sdkp
->capacity
<<= 1;
1255 else if (sector_size
== 256)
1256 sdkp
->capacity
>>= 1;
1258 sdkp
->device
->sector_size
= sector_size
;
1261 /* called with buffer of length 512 */
1263 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1264 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1265 struct scsi_sense_hdr
*sshdr
)
1267 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1268 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1273 * read write protect setting, if possible - called only in sd_revalidate_disk()
1274 * called with buffer of length 512
1277 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1278 unsigned char *buffer
)
1281 struct scsi_device
*sdp
= sdkp
->device
;
1282 struct scsi_mode_data data
;
1284 set_disk_ro(sdkp
->disk
, 0);
1285 if (sdp
->skip_ms_page_3f
) {
1286 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1290 if (sdp
->use_192_bytes_for_3f
) {
1291 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1294 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1295 * We have to start carefully: some devices hang if we ask
1296 * for more than is available.
1298 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1301 * Second attempt: ask for page 0 When only page 0 is
1302 * implemented, a request for page 3F may return Sense Key
1303 * 5: Illegal Request, Sense Code 24: Invalid field in
1306 if (!scsi_status_is_good(res
))
1307 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1310 * Third attempt: ask 255 bytes, as we did earlier.
1312 if (!scsi_status_is_good(res
))
1313 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1317 if (!scsi_status_is_good(res
)) {
1319 "%s: test WP failed, assume Write Enabled\n", diskname
);
1321 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1322 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1323 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1324 sdkp
->write_prot
? "on" : "off");
1325 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1326 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1331 * sd_read_cache_type - called only from sd_revalidate_disk()
1332 * called with buffer of length 512
1335 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1336 unsigned char *buffer
)
1339 struct scsi_device
*sdp
= sdkp
->device
;
1343 struct scsi_mode_data data
;
1344 struct scsi_sense_hdr sshdr
;
1346 if (sdp
->skip_ms_page_8
)
1349 if (sdp
->type
== TYPE_RBC
) {
1357 /* cautiously ask */
1358 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1360 if (!scsi_status_is_good(res
))
1363 /* that went OK, now ask for the proper length */
1367 * We're only interested in the first three bytes, actually.
1368 * But the data cache page is defined for the first 20.
1375 /* Take headers and block descriptors into account */
1376 len
+= data
.header_length
+ data
.block_descriptor_length
;
1379 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1381 if (scsi_status_is_good(res
)) {
1382 const char *types
[] = {
1383 "write through", "none", "write back",
1384 "write back, no read (daft)"
1387 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1389 if ((buffer
[offset
] & 0x3f) != modepage
) {
1390 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1394 if (modepage
== 8) {
1395 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1396 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1398 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1402 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1403 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1404 printk(KERN_NOTICE
"SCSI device %s: uses "
1405 "READ/WRITE(6), disabling FUA\n", diskname
);
1409 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1411 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s%s\n",
1412 diskname
, types
[ct
],
1413 sdkp
->DPOFUA
? " w/ FUA" : "");
1419 if (scsi_sense_valid(&sshdr
) &&
1420 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1421 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1422 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1423 diskname
); /* Invalid field in CDB */
1425 printk(KERN_ERR
"%s: asking for cache data failed\n",
1429 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1436 * sd_revalidate_disk - called the first time a new disk is seen,
1437 * performs disk spin up, read_capacity, etc.
1438 * @disk: struct gendisk we care about
1440 static int sd_revalidate_disk(struct gendisk
*disk
)
1442 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1443 struct scsi_device
*sdp
= sdkp
->device
;
1444 unsigned char *buffer
;
1447 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1450 * If the device is offline, don't try and read capacity or any
1451 * of the other niceties.
1453 if (!scsi_device_online(sdp
))
1456 buffer
= kmalloc(512, GFP_KERNEL
| __GFP_DMA
);
1458 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1463 /* defaults, until the device tells us otherwise */
1464 sdp
->sector_size
= 512;
1466 sdkp
->media_present
= 1;
1467 sdkp
->write_prot
= 0;
1471 sd_spinup_disk(sdkp
, disk
->disk_name
);
1474 * Without media there is no reason to ask; moreover, some devices
1475 * react badly if we do.
1477 if (sdkp
->media_present
) {
1478 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1479 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1480 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1484 * We now have all cache related info, determine how we deal
1485 * with ordered requests. Note that as the current SCSI
1486 * dispatch function can alter request order, we cannot use
1487 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1490 ordered
= sdkp
->DPOFUA
1491 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1493 ordered
= QUEUE_ORDERED_DRAIN
;
1495 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1497 set_capacity(disk
, sdkp
->capacity
);
1505 * sd_probe - called during driver initialization and whenever a
1506 * new scsi device is attached to the system. It is called once
1507 * for each scsi device (not just disks) present.
1508 * @dev: pointer to device object
1510 * Returns 0 if successful (or not interested in this scsi device
1511 * (e.g. scanner)); 1 when there is an error.
1513 * Note: this function is invoked from the scsi mid-level.
1514 * This function sets up the mapping between a given
1515 * <host,channel,id,lun> (found in sdp) and new device name
1516 * (e.g. /dev/sda). More precisely it is the block device major
1517 * and minor number that is chosen here.
1519 * Assume sd_attach is not re-entrant (for time being)
1520 * Also think about sd_attach() and sd_remove() running coincidentally.
1522 static int sd_probe(struct device
*dev
)
1524 struct scsi_device
*sdp
= to_scsi_device(dev
);
1525 struct scsi_disk
*sdkp
;
1531 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1534 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1538 sdkp
= kmalloc(sizeof(*sdkp
), GFP_KERNEL
);
1542 memset (sdkp
, 0, sizeof(*sdkp
));
1543 kref_init(&sdkp
->kref
);
1545 gd
= alloc_disk(16);
1549 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1552 spin_lock(&sd_index_lock
);
1553 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1554 spin_unlock(&sd_index_lock
);
1556 if (index
>= SD_MAX_DISKS
)
1561 get_device(&sdp
->sdev_gendev
);
1563 sdkp
->driver
= &sd_template
;
1565 sdkp
->index
= index
;
1568 if (!sdp
->timeout
) {
1569 if (sdp
->type
!= TYPE_MOD
)
1570 sdp
->timeout
= SD_TIMEOUT
;
1572 sdp
->timeout
= SD_MOD_TIMEOUT
;
1575 gd
->major
= sd_major((index
& 0xf0) >> 4);
1576 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1578 gd
->fops
= &sd_fops
;
1581 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1582 } else if (index
< (26 + 1) * 26) {
1583 sprintf(gd
->disk_name
, "sd%c%c",
1584 'a' + index
/ 26 - 1,'a' + index
% 26);
1586 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1587 const unsigned int m2
= (index
/ 26 - 1) % 26;
1588 const unsigned int m3
= index
% 26;
1589 sprintf(gd
->disk_name
, "sd%c%c%c",
1590 'a' + m1
, 'a' + m2
, 'a' + m3
);
1593 strcpy(gd
->devfs_name
, sdp
->devfs_name
);
1595 gd
->private_data
= &sdkp
->driver
;
1596 gd
->queue
= sdkp
->device
->request_queue
;
1598 sd_revalidate_disk(gd
);
1600 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1601 gd
->flags
= GENHD_FL_DRIVERFS
;
1603 gd
->flags
|= GENHD_FL_REMOVABLE
;
1605 dev_set_drvdata(dev
, sdkp
);
1608 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1609 sdp
->removable
? "removable " : "", gd
->disk_name
);
1622 * sd_remove - called whenever a scsi disk (previously recognized by
1623 * sd_probe) is detached from the system. It is called (potentially
1624 * multiple times) during sd module unload.
1625 * @sdp: pointer to mid level scsi device object
1627 * Note: this function is invoked from the scsi mid-level.
1628 * This function potentially frees up a device name (e.g. /dev/sdc)
1629 * that could be re-used by a subsequent sd_probe().
1630 * This function is not called when the built-in sd driver is "exit-ed".
1632 static int sd_remove(struct device
*dev
)
1634 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1636 del_gendisk(sdkp
->disk
);
1639 mutex_lock(&sd_ref_mutex
);
1640 dev_set_drvdata(dev
, NULL
);
1641 kref_put(&sdkp
->kref
, scsi_disk_release
);
1642 mutex_unlock(&sd_ref_mutex
);
1648 * scsi_disk_release - Called to free the scsi_disk structure
1649 * @kref: pointer to embedded kref
1651 * sd_ref_mutex must be held entering this routine. Because it is
1652 * called on last put, you should always use the scsi_disk_get()
1653 * scsi_disk_put() helpers which manipulate the semaphore directly
1654 * and never do a direct kref_put().
1656 static void scsi_disk_release(struct kref
*kref
)
1658 struct scsi_disk
*sdkp
= to_scsi_disk(kref
);
1659 struct gendisk
*disk
= sdkp
->disk
;
1661 spin_lock(&sd_index_lock
);
1662 idr_remove(&sd_index_idr
, sdkp
->index
);
1663 spin_unlock(&sd_index_lock
);
1665 disk
->private_data
= NULL
;
1667 put_device(&sdkp
->device
->sdev_gendev
);
1673 * Send a SYNCHRONIZE CACHE instruction down to the device through
1674 * the normal SCSI command structure. Wait for the command to
1677 static void sd_shutdown(struct device
*dev
)
1679 struct scsi_device
*sdp
= to_scsi_device(dev
);
1680 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1683 return; /* this can happen */
1686 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1687 sdkp
->disk
->disk_name
);
1690 scsi_disk_put(sdkp
);
1694 * init_sd - entry point for this driver (both when built in or when
1697 * Note: this function registers this driver with the scsi mid-level.
1699 static int __init
init_sd(void)
1703 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1705 for (i
= 0; i
< SD_MAJORS
; i
++)
1706 if (register_blkdev(sd_major(i
), "sd") == 0)
1712 return scsi_register_driver(&sd_template
.gendrv
);
1716 * exit_sd - exit point for this driver (when it is a module).
1718 * Note: this function unregisters this driver from the scsi mid-level.
1720 static void __exit
exit_sd(void)
1724 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1726 scsi_unregister_driver(&sd_template
.gendrv
);
1727 for (i
= 0; i
< SD_MAJORS
; i
++)
1728 unregister_blkdev(sd_major(i
), "sd");
1731 MODULE_LICENSE("GPL");
1732 MODULE_AUTHOR("Eric Youngdale");
1733 MODULE_DESCRIPTION("SCSI disk (sd) driver");
1735 module_init(init_sd
);
1736 module_exit(exit_sd
);