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 */
105 unsigned DPOFUA
: 1; /* state of disk DPOFUA bit */
108 static DEFINE_IDR(sd_index_idr
);
109 static DEFINE_SPINLOCK(sd_index_lock
);
111 /* This semaphore is used to mediate the 0->1 reference get in the
112 * face of object destruction (i.e. we can't allow a get on an
113 * object after last put) */
114 static DECLARE_MUTEX(sd_ref_sem
);
116 static int sd_revalidate_disk(struct gendisk
*disk
);
117 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
);
119 static int sd_probe(struct device
*);
120 static int sd_remove(struct device
*);
121 static void sd_shutdown(struct device
*dev
);
122 static void sd_rescan(struct device
*);
123 static int sd_init_command(struct scsi_cmnd
*);
124 static int sd_issue_flush(struct device
*, sector_t
*);
125 static void sd_prepare_flush(request_queue_t
*, struct request
*);
126 static void sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
127 unsigned char *buffer
);
129 static struct scsi_driver sd_template
= {
130 .owner
= THIS_MODULE
,
135 .shutdown
= sd_shutdown
,
138 .init_command
= sd_init_command
,
139 .issue_flush
= sd_issue_flush
,
143 * Device no to disk mapping:
145 * major disc2 disc p1
146 * |............|.............|....|....| <- dev_t
149 * Inside a major, we have 16k disks, however mapped non-
150 * contiguously. The first 16 disks are for major0, the next
151 * ones with major1, ... Disk 256 is for major0 again, disk 272
153 * As we stay compatible with our numbering scheme, we can reuse
154 * the well-know SCSI majors 8, 65--71, 136--143.
156 static int sd_major(int major_idx
)
160 return SCSI_DISK0_MAJOR
;
162 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
164 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
167 return 0; /* shut up gcc */
171 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref)
173 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
175 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
178 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
180 struct scsi_disk
*sdkp
= NULL
;
182 if (disk
->private_data
) {
183 sdkp
= scsi_disk(disk
);
184 if (scsi_device_get(sdkp
->device
) == 0)
185 kref_get(&sdkp
->kref
);
192 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
194 struct scsi_disk
*sdkp
;
197 sdkp
= __scsi_disk_get(disk
);
202 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
204 struct scsi_disk
*sdkp
;
207 sdkp
= dev_get_drvdata(dev
);
209 sdkp
= __scsi_disk_get(sdkp
->disk
);
214 static void scsi_disk_put(struct scsi_disk
*sdkp
)
216 struct scsi_device
*sdev
= sdkp
->device
;
219 kref_put(&sdkp
->kref
, scsi_disk_release
);
220 scsi_device_put(sdev
);
225 * sd_init_command - build a scsi (read or write) command from
226 * information in the request structure.
227 * @SCpnt: pointer to mid-level's per scsi command structure that
228 * contains request and into which the scsi command is written
230 * Returns 1 if successful and 0 if error (or cannot be done now).
232 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
234 unsigned int this_count
, timeout
;
235 struct gendisk
*disk
;
237 struct scsi_device
*sdp
= SCpnt
->device
;
238 struct request
*rq
= SCpnt
->request
;
240 timeout
= sdp
->timeout
;
243 * SG_IO from block layer already setup, just copy cdb basically
245 if (blk_pc_request(rq
)) {
246 scsi_setup_blk_pc_cmnd(SCpnt
);
248 timeout
= rq
->timeout
;
254 * we only do REQ_CMD and REQ_BLOCK_PC
256 if (!blk_fs_request(rq
))
261 this_count
= SCpnt
->request_bufflen
>> 9;
263 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
264 "count=%d\n", disk
->disk_name
,
265 (unsigned long long)block
, this_count
));
267 if (!sdp
|| !scsi_device_online(sdp
) ||
268 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
269 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
271 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
277 * quietly refuse to do anything to a changed disc until
278 * the changed bit has been reset
280 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
283 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
284 disk
->disk_name
, (unsigned long long)block
));
287 * If we have a 1K hardware sectorsize, prevent access to single
288 * 512 byte sectors. In theory we could handle this - in fact
289 * the scsi cdrom driver must be able to handle this because
290 * we typically use 1K blocksizes, and cdroms typically have
291 * 2K hardware sectorsizes. Of course, things are simpler
292 * with the cdrom, since it is read-only. For performance
293 * reasons, the filesystems should be able to handle this
294 * and not force the scsi disk driver to use bounce buffers
297 if (sdp
->sector_size
== 1024) {
298 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
299 printk(KERN_ERR
"sd: Bad block number requested");
303 this_count
= this_count
>> 1;
306 if (sdp
->sector_size
== 2048) {
307 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
308 printk(KERN_ERR
"sd: Bad block number requested");
312 this_count
= this_count
>> 2;
315 if (sdp
->sector_size
== 4096) {
316 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
317 printk(KERN_ERR
"sd: Bad block number requested");
321 this_count
= this_count
>> 3;
324 if (rq_data_dir(rq
) == WRITE
) {
325 if (!sdp
->writeable
) {
328 SCpnt
->cmnd
[0] = WRITE_6
;
329 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
330 } else if (rq_data_dir(rq
) == READ
) {
331 SCpnt
->cmnd
[0] = READ_6
;
332 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
334 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
335 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
339 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
340 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
341 "writing" : "reading", this_count
, rq
->nr_sectors
));
345 if (block
> 0xffffffff) {
346 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
347 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
348 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
349 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
350 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
351 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
352 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
353 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
354 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
355 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
356 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
357 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
358 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
359 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
360 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
361 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
362 SCpnt
->device
->use_10_for_rw
) {
363 if (this_count
> 0xffff)
366 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
367 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
368 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
369 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
370 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
371 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
372 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
373 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
374 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
376 if (unlikely(blk_fua_rq(rq
))) {
378 * This happens only if this drive failed
379 * 10byte rw command with ILLEGAL_REQUEST
380 * during operation and thus turned off
383 printk(KERN_ERR
"sd: FUA write on READ/WRITE(6) drive\n");
387 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
388 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
389 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
390 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
393 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
394 this_count
* sdp
->sector_size
;
397 * We shouldn't disconnect in the middle of a sector, so with a dumb
398 * host adapter, it's safe to assume that we can at least transfer
399 * this many bytes between each connect / disconnect.
401 SCpnt
->transfersize
= sdp
->sector_size
;
402 SCpnt
->underflow
= this_count
<< 9;
403 SCpnt
->allowed
= SD_MAX_RETRIES
;
406 SCpnt
->timeout_per_command
= timeout
;
409 * This is the completion routine we use. This is matched in terms
410 * of capability to this function.
412 SCpnt
->done
= sd_rw_intr
;
415 * This indicates that the command is ready from our end to be
422 * sd_open - open a scsi disk device
423 * @inode: only i_rdev member may be used
424 * @filp: only f_mode and f_flags may be used
426 * Returns 0 if successful. Returns a negated errno value in case
429 * Note: This can be called from a user context (e.g. fsck(1) )
430 * or from within the kernel (e.g. as a result of a mount(1) ).
431 * In the latter case @inode and @filp carry an abridged amount
432 * of information as noted above.
434 static int sd_open(struct inode
*inode
, struct file
*filp
)
436 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
437 struct scsi_disk
*sdkp
;
438 struct scsi_device
*sdev
;
441 if (!(sdkp
= scsi_disk_get(disk
)))
445 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
450 * If the device is in error recovery, wait until it is done.
451 * If the device is offline, then disallow any access to it.
454 if (!scsi_block_when_processing_errors(sdev
))
457 if (sdev
->removable
|| sdkp
->write_prot
)
458 check_disk_change(inode
->i_bdev
);
461 * If the drive is empty, just let the open fail.
464 if (sdev
->removable
&& !sdkp
->media_present
&&
465 !(filp
->f_flags
& O_NDELAY
))
469 * If the device has the write protect tab set, have the open fail
470 * if the user expects to be able to write to the thing.
473 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
477 * It is possible that the disk changing stuff resulted in
478 * the device being taken offline. If this is the case,
479 * report this to the user, and don't pretend that the
480 * open actually succeeded.
483 if (!scsi_device_online(sdev
))
486 if (!sdkp
->openers
++ && sdev
->removable
) {
487 if (scsi_block_when_processing_errors(sdev
))
488 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
499 * sd_release - invoked when the (last) close(2) is called on this
501 * @inode: only i_rdev member may be used
502 * @filp: only f_mode and f_flags may be used
506 * Note: may block (uninterruptible) if error recovery is underway
509 static int sd_release(struct inode
*inode
, struct file
*filp
)
511 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
512 struct scsi_disk
*sdkp
= scsi_disk(disk
);
513 struct scsi_device
*sdev
= sdkp
->device
;
515 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
517 if (!--sdkp
->openers
&& sdev
->removable
) {
518 if (scsi_block_when_processing_errors(sdev
))
519 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
523 * XXX and what if there are packets in flight and this close()
524 * XXX is followed by a "rmmod sd_mod"?
530 static int sd_hdio_getgeo(struct block_device
*bdev
, struct hd_geometry __user
*loc
)
532 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
533 struct scsi_device
*sdp
= sdkp
->device
;
534 struct Scsi_Host
*host
= sdp
->host
;
537 /* default to most commonly used values */
538 diskinfo
[0] = 0x40; /* 1 << 6 */
539 diskinfo
[1] = 0x20; /* 1 << 5 */
540 diskinfo
[2] = sdkp
->capacity
>> 11;
542 /* override with calculated, extended default, or driver values */
543 if (host
->hostt
->bios_param
)
544 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
546 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
548 if (put_user(diskinfo
[0], &loc
->heads
))
550 if (put_user(diskinfo
[1], &loc
->sectors
))
552 if (put_user(diskinfo
[2], &loc
->cylinders
))
554 if (put_user((unsigned)get_start_sect(bdev
),
555 (unsigned long __user
*)&loc
->start
))
561 * sd_ioctl - process an ioctl
562 * @inode: only i_rdev/i_bdev members may be used
563 * @filp: only f_mode and f_flags may be used
564 * @cmd: ioctl command number
565 * @arg: this is third argument given to ioctl(2) system call.
566 * Often contains a pointer.
568 * Returns 0 if successful (some ioctls return postive numbers on
569 * success as well). Returns a negated errno value in case of error.
571 * Note: most ioctls are forward onto the block subsystem or further
572 * down in the scsi subsytem.
574 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
575 unsigned int cmd
, unsigned long arg
)
577 struct block_device
*bdev
= inode
->i_bdev
;
578 struct gendisk
*disk
= bdev
->bd_disk
;
579 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
580 void __user
*p
= (void __user
*)arg
;
583 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
584 disk
->disk_name
, cmd
));
587 * If we are in the middle of error recovery, don't let anyone
588 * else try and use this device. Also, if error recovery fails, it
589 * may try and take the device offline, in which case all further
590 * access to the device is prohibited.
592 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
593 if (!scsi_block_when_processing_errors(sdp
) || !error
)
596 if (cmd
== HDIO_GETGEO
) {
599 return sd_hdio_getgeo(bdev
, p
);
603 * Send SCSI addressing ioctls directly to mid level, send other
604 * ioctls to block level and then onto mid level if they can't be
608 case SCSI_IOCTL_GET_IDLUN
:
609 case SCSI_IOCTL_GET_BUS_NUMBER
:
610 return scsi_ioctl(sdp
, cmd
, p
);
612 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
613 if (error
!= -ENOTTY
)
616 return scsi_ioctl(sdp
, cmd
, p
);
619 static void set_media_not_present(struct scsi_disk
*sdkp
)
621 sdkp
->media_present
= 0;
623 sdkp
->device
->changed
= 1;
627 * sd_media_changed - check if our medium changed
628 * @disk: kernel device descriptor
630 * Returns 0 if not applicable or no change; 1 if change
632 * Note: this function is invoked from the block subsystem.
634 static int sd_media_changed(struct gendisk
*disk
)
636 struct scsi_disk
*sdkp
= scsi_disk(disk
);
637 struct scsi_device
*sdp
= sdkp
->device
;
640 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
647 * If the device is offline, don't send any commands - just pretend as
648 * if the command failed. If the device ever comes back online, we
649 * can deal with it then. It is only because of unrecoverable errors
650 * that we would ever take a device offline in the first place.
652 if (!scsi_device_online(sdp
))
656 * Using TEST_UNIT_READY enables differentiation between drive with
657 * no cartridge loaded - NOT READY, drive with changed cartridge -
658 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
660 * Drives that auto spin down. eg iomega jaz 1G, will be started
661 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
662 * sd_revalidate() is called.
665 if (scsi_block_when_processing_errors(sdp
))
666 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
669 * Unable to test, unit probably not ready. This usually
670 * means there is no disc in the drive. Mark as changed,
671 * and we will figure it out later once the drive is
678 * For removable scsi disk we have to recognise the presence
679 * of a disk in the drive. This is kept in the struct scsi_disk
680 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
682 sdkp
->media_present
= 1;
684 retval
= sdp
->changed
;
690 set_media_not_present(sdkp
);
694 static int sd_sync_cache(struct scsi_device
*sdp
)
697 struct scsi_sense_hdr sshdr
;
699 if (!scsi_device_online(sdp
))
703 for (retries
= 3; retries
> 0; --retries
) {
704 unsigned char cmd
[10] = { 0 };
706 cmd
[0] = SYNCHRONIZE_CACHE
;
708 * Leave the rest of the command zero to indicate
711 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
712 SD_TIMEOUT
, SD_MAX_RETRIES
);
717 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
718 "host = %d, driver = %02x\n ",
719 status_byte(res
), msg_byte(res
),
720 host_byte(res
), driver_byte(res
));
721 if (driver_byte(res
) & DRIVER_SENSE
)
722 scsi_print_sense_hdr("sd", &sshdr
);
728 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
731 struct scsi_device
*sdp
= to_scsi_device(dev
);
732 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
738 ret
= sd_sync_cache(sdp
);
743 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
745 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
746 rq
->flags
|= REQ_BLOCK_PC
;
747 rq
->timeout
= SD_TIMEOUT
;
748 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
752 static void sd_rescan(struct device
*dev
)
754 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
757 sd_revalidate_disk(sdkp
->disk
);
765 * This gets directly called from VFS. When the ioctl
766 * is not recognized we go back to the other translation paths.
768 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
770 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
771 struct gendisk
*disk
= bdev
->bd_disk
;
772 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
775 * If we are in the middle of error recovery, don't let anyone
776 * else try and use this device. Also, if error recovery fails, it
777 * may try and take the device offline, in which case all further
778 * access to the device is prohibited.
780 if (!scsi_block_when_processing_errors(sdev
))
783 if (sdev
->host
->hostt
->compat_ioctl
) {
786 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
792 * Let the static ioctl translation table take care of it.
798 static struct block_device_operations sd_fops
= {
799 .owner
= THIS_MODULE
,
801 .release
= sd_release
,
804 .compat_ioctl
= sd_compat_ioctl
,
806 .media_changed
= sd_media_changed
,
807 .revalidate_disk
= sd_revalidate_disk
,
811 * sd_rw_intr - bottom half handler: called when the lower level
812 * driver has completed (successfully or otherwise) a scsi command.
813 * @SCpnt: mid-level's per command structure.
815 * Note: potentially run from within an ISR. Must not block.
817 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
819 int result
= SCpnt
->result
;
820 int this_count
= SCpnt
->bufflen
;
821 int good_bytes
= (result
== 0 ? this_count
: 0);
822 sector_t block_sectors
= 1;
824 sector_t error_sector
;
825 struct scsi_sense_hdr sshdr
;
827 int sense_deferred
= 0;
831 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
833 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
836 #ifdef CONFIG_SCSI_LOGGING
837 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
838 SCpnt
->request
->rq_disk
->disk_name
, result
));
840 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
841 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
842 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
846 Handle MEDIUM ERRORs that indicate partial success. Since this is a
847 relatively rare error condition, no care is taken to avoid
848 unnecessary additional work such as memcpy's that could be avoided.
852 * If SG_IO from block layer then set good_bytes to stop retries;
853 * else if errors, check them, and if necessary prepare for
856 if (blk_pc_request(SCpnt
->request
))
857 good_bytes
= this_count
;
858 else if (driver_byte(result
) != 0 &&
859 sense_valid
&& !sense_deferred
) {
860 switch (sshdr
.sense_key
) {
862 if (!blk_fs_request(SCpnt
->request
))
864 info_valid
= scsi_get_sense_info_fld(
865 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
868 * May want to warn and skip if following cast results
869 * in actual truncation (if sector_t < 64 bits)
871 error_sector
= (sector_t
)first_err_block
;
872 if (SCpnt
->request
->bio
!= NULL
)
873 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
874 switch (SCpnt
->device
->sector_size
) {
877 if (block_sectors
< 2)
882 if (block_sectors
< 4)
887 if (block_sectors
< 8)
897 error_sector
&= ~(block_sectors
- 1);
898 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
899 if (good_bytes
< 0 || good_bytes
>= this_count
)
903 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
904 case NO_SENSE
: /* LLDD got sense data */
906 * Inform the user, but make sure that it's not treated
909 scsi_print_sense("sd", SCpnt
);
911 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
912 good_bytes
= this_count
;
915 case ILLEGAL_REQUEST
:
916 if (SCpnt
->device
->use_10_for_rw
&&
917 (SCpnt
->cmnd
[0] == READ_10
||
918 SCpnt
->cmnd
[0] == WRITE_10
))
919 SCpnt
->device
->use_10_for_rw
= 0;
920 if (SCpnt
->device
->use_10_for_ms
&&
921 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
922 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
923 SCpnt
->device
->use_10_for_ms
= 0;
931 * This calls the generic completion function, now that we know
932 * how many actual sectors finished, and how many sectors we need
933 * to say have failed.
935 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
938 static int media_not_present(struct scsi_disk
*sdkp
,
939 struct scsi_sense_hdr
*sshdr
)
942 if (!scsi_sense_valid(sshdr
))
944 /* not invoked for commands that could return deferred errors */
945 if (sshdr
->sense_key
!= NOT_READY
&&
946 sshdr
->sense_key
!= UNIT_ATTENTION
)
948 if (sshdr
->asc
!= 0x3A) /* medium not present */
951 set_media_not_present(sdkp
);
956 * spinup disk - called only in sd_revalidate_disk()
959 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
961 unsigned char cmd
[10];
962 unsigned long spintime_expire
= 0;
963 int retries
, spintime
;
964 unsigned int the_result
;
965 struct scsi_sense_hdr sshdr
;
970 /* Spin up drives, as required. Only do this at boot time */
971 /* Spinup needs to be done for module loads too. */
976 cmd
[0] = TEST_UNIT_READY
;
977 memset((void *) &cmd
[1], 0, 9);
979 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
985 sense_valid
= scsi_sense_valid(&sshdr
);
987 } while (retries
< 3 &&
988 (!scsi_status_is_good(the_result
) ||
989 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
990 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
993 * If the drive has indicated to us that it doesn't have
994 * any media in it, don't bother with any of the rest of
997 if (media_not_present(sdkp
, &sshdr
))
1000 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1001 /* no sense, TUR either succeeded or failed
1002 * with a status error */
1003 if(!spintime
&& !scsi_status_is_good(the_result
))
1004 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1005 "error = 0x%x\n", diskname
, the_result
);
1010 * The device does not want the automatic start to be issued.
1012 if (sdkp
->device
->no_start_on_add
) {
1017 * If manual intervention is required, or this is an
1018 * absent USB storage device, a spinup is meaningless.
1021 sshdr
.sense_key
== NOT_READY
&&
1022 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1023 break; /* manual intervention required */
1026 * Issue command to spin up drive when not ready
1028 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1030 printk(KERN_NOTICE
"%s: Spinning up disk...",
1032 cmd
[0] = START_STOP
;
1033 cmd
[1] = 1; /* Return immediately */
1034 memset((void *) &cmd
[2], 0, 8);
1035 cmd
[4] = 1; /* Start spin cycle */
1036 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1038 SD_TIMEOUT
, SD_MAX_RETRIES
);
1039 spintime_expire
= jiffies
+ 100 * HZ
;
1042 /* Wait 1 second for next try */
1047 * Wait for USB flash devices with slow firmware.
1048 * Yes, this sense key/ASC combination shouldn't
1049 * occur here. It's characteristic of these devices.
1051 } else if (sense_valid
&&
1052 sshdr
.sense_key
== UNIT_ATTENTION
&&
1053 sshdr
.asc
== 0x28) {
1055 spintime_expire
= jiffies
+ 5 * HZ
;
1058 /* Wait 1 second for next try */
1061 /* we don't understand the sense code, so it's
1062 * probably pointless to loop */
1064 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1065 "sense:\n", diskname
);
1066 scsi_print_sense_hdr("", &sshdr
);
1071 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1074 if (scsi_status_is_good(the_result
))
1077 printk("not responding...\n");
1082 * read disk capacity
1085 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1086 unsigned char *buffer
)
1088 unsigned char cmd
[16];
1089 int the_result
, retries
;
1090 int sector_size
= 0;
1092 struct scsi_sense_hdr sshdr
;
1093 int sense_valid
= 0;
1094 struct scsi_device
*sdp
= sdkp
->device
;
1100 memset((void *) cmd
, 0, 16);
1101 cmd
[0] = SERVICE_ACTION_IN
;
1102 cmd
[1] = SAI_READ_CAPACITY_16
;
1104 memset((void *) buffer
, 0, 12);
1106 cmd
[0] = READ_CAPACITY
;
1107 memset((void *) &cmd
[1], 0, 9);
1108 memset((void *) buffer
, 0, 8);
1111 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1112 buffer
, longrc
? 12 : 8, &sshdr
,
1113 SD_TIMEOUT
, SD_MAX_RETRIES
);
1115 if (media_not_present(sdkp
, &sshdr
))
1119 sense_valid
= scsi_sense_valid(&sshdr
);
1122 } while (the_result
&& retries
);
1124 if (the_result
&& !longrc
) {
1125 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1126 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1128 status_byte(the_result
),
1129 msg_byte(the_result
),
1130 host_byte(the_result
),
1131 driver_byte(the_result
));
1133 if (driver_byte(the_result
) & DRIVER_SENSE
)
1134 scsi_print_sense_hdr("sd", &sshdr
);
1136 printk("%s : sense not available. \n", diskname
);
1138 /* Set dirty bit for removable devices if not ready -
1139 * sometimes drives will not report this properly. */
1140 if (sdp
->removable
&&
1141 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1144 /* Either no media are present but the drive didn't tell us,
1145 or they are present but the read capacity command fails */
1146 /* sdkp->media_present = 0; -- not always correct */
1147 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1150 } else if (the_result
&& longrc
) {
1151 /* READ CAPACITY(16) has been failed */
1152 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1153 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1155 status_byte(the_result
),
1156 msg_byte(the_result
),
1157 host_byte(the_result
),
1158 driver_byte(the_result
));
1159 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1162 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1167 sector_size
= (buffer
[4] << 24) |
1168 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1169 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1170 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1171 if(sizeof(sdkp
->capacity
) > 4) {
1172 printk(KERN_NOTICE
"%s : very big device. try to use"
1173 " READ CAPACITY(16).\n", diskname
);
1177 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1178 "kernel compiled with support for large block "
1179 "devices.\n", diskname
);
1183 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1188 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1189 ((u64
)buffer
[1] << 48) |
1190 ((u64
)buffer
[2] << 40) |
1191 ((u64
)buffer
[3] << 32) |
1192 ((sector_t
)buffer
[4] << 24) |
1193 ((sector_t
)buffer
[5] << 16) |
1194 ((sector_t
)buffer
[6] << 8) |
1195 (sector_t
)buffer
[7]);
1197 sector_size
= (buffer
[8] << 24) |
1198 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1201 /* Some devices return the total number of sectors, not the
1202 * highest sector number. Make the necessary adjustment. */
1203 if (sdp
->fix_capacity
)
1207 if (sector_size
== 0) {
1209 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1210 "assuming 512.\n", diskname
);
1213 if (sector_size
!= 512 &&
1214 sector_size
!= 1024 &&
1215 sector_size
!= 2048 &&
1216 sector_size
!= 4096 &&
1217 sector_size
!= 256) {
1218 printk(KERN_NOTICE
"%s : unsupported sector size "
1219 "%d.\n", diskname
, sector_size
);
1221 * The user might want to re-format the drive with
1222 * a supported sectorsize. Once this happens, it
1223 * would be relatively trivial to set the thing up.
1224 * For this reason, we leave the thing in the table.
1228 * set a bogus sector size so the normal read/write
1229 * logic in the block layer will eventually refuse any
1230 * request on this device without tripping over power
1231 * of two sector size assumptions
1237 * The msdos fs needs to know the hardware sector size
1238 * So I have created this table. See ll_rw_blk.c
1239 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1241 int hard_sector
= sector_size
;
1242 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1243 request_queue_t
*queue
= sdp
->request_queue
;
1246 blk_queue_hardsect_size(queue
, hard_sector
);
1247 /* avoid 64-bit division on 32-bit platforms */
1248 sector_div(sz
, 625);
1250 sector_div(mb
, 1950);
1252 printk(KERN_NOTICE
"SCSI device %s: "
1253 "%llu %d-byte hdwr sectors (%llu MB)\n",
1254 diskname
, (unsigned long long)sdkp
->capacity
,
1255 hard_sector
, (unsigned long long)mb
);
1258 /* Rescale capacity to 512-byte units */
1259 if (sector_size
== 4096)
1260 sdkp
->capacity
<<= 3;
1261 else if (sector_size
== 2048)
1262 sdkp
->capacity
<<= 2;
1263 else if (sector_size
== 1024)
1264 sdkp
->capacity
<<= 1;
1265 else if (sector_size
== 256)
1266 sdkp
->capacity
>>= 1;
1268 sdkp
->device
->sector_size
= sector_size
;
1271 /* called with buffer of length 512 */
1273 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1274 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1275 struct scsi_sense_hdr
*sshdr
)
1277 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1278 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1283 * read write protect setting, if possible - called only in sd_revalidate_disk()
1284 * called with buffer of length 512
1287 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1288 unsigned char *buffer
)
1291 struct scsi_device
*sdp
= sdkp
->device
;
1292 struct scsi_mode_data data
;
1294 set_disk_ro(sdkp
->disk
, 0);
1295 if (sdp
->skip_ms_page_3f
) {
1296 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1300 if (sdp
->use_192_bytes_for_3f
) {
1301 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1304 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1305 * We have to start carefully: some devices hang if we ask
1306 * for more than is available.
1308 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1311 * Second attempt: ask for page 0 When only page 0 is
1312 * implemented, a request for page 3F may return Sense Key
1313 * 5: Illegal Request, Sense Code 24: Invalid field in
1316 if (!scsi_status_is_good(res
))
1317 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1320 * Third attempt: ask 255 bytes, as we did earlier.
1322 if (!scsi_status_is_good(res
))
1323 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1327 if (!scsi_status_is_good(res
)) {
1329 "%s: test WP failed, assume Write Enabled\n", diskname
);
1331 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1332 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1333 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1334 sdkp
->write_prot
? "on" : "off");
1335 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1336 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1341 * sd_read_cache_type - called only from sd_revalidate_disk()
1342 * called with buffer of length 512
1345 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1346 unsigned char *buffer
)
1349 struct scsi_device
*sdp
= sdkp
->device
;
1353 struct scsi_mode_data data
;
1354 struct scsi_sense_hdr sshdr
;
1356 if (sdp
->skip_ms_page_8
)
1359 if (sdp
->type
== TYPE_RBC
) {
1367 /* cautiously ask */
1368 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1370 if (!scsi_status_is_good(res
))
1373 /* that went OK, now ask for the proper length */
1377 * We're only interested in the first three bytes, actually.
1378 * But the data cache page is defined for the first 20.
1385 /* Take headers and block descriptors into account */
1386 len
+= data
.header_length
+ data
.block_descriptor_length
;
1389 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1391 if (scsi_status_is_good(res
)) {
1392 const char *types
[] = {
1393 "write through", "none", "write back",
1394 "write back, no read (daft)"
1397 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1399 if ((buffer
[offset
] & 0x3f) != modepage
) {
1400 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1404 if (modepage
== 8) {
1405 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1406 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1408 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1412 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1413 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1414 printk(KERN_NOTICE
"SCSI device %s: uses "
1415 "READ/WRITE(6), disabling FUA\n", diskname
);
1419 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1421 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s%s\n",
1422 diskname
, types
[ct
],
1423 sdkp
->DPOFUA
? " w/ FUA" : "");
1429 if (scsi_sense_valid(&sshdr
) &&
1430 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1431 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1432 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1433 diskname
); /* Invalid field in CDB */
1435 printk(KERN_ERR
"%s: asking for cache data failed\n",
1439 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1446 * sd_revalidate_disk - called the first time a new disk is seen,
1447 * performs disk spin up, read_capacity, etc.
1448 * @disk: struct gendisk we care about
1450 static int sd_revalidate_disk(struct gendisk
*disk
)
1452 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1453 struct scsi_device
*sdp
= sdkp
->device
;
1454 unsigned char *buffer
;
1457 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1460 * If the device is offline, don't try and read capacity or any
1461 * of the other niceties.
1463 if (!scsi_device_online(sdp
))
1466 buffer
= kmalloc(512, GFP_KERNEL
| __GFP_DMA
);
1468 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1473 /* defaults, until the device tells us otherwise */
1474 sdp
->sector_size
= 512;
1476 sdkp
->media_present
= 1;
1477 sdkp
->write_prot
= 0;
1481 sd_spinup_disk(sdkp
, disk
->disk_name
);
1484 * Without media there is no reason to ask; moreover, some devices
1485 * react badly if we do.
1487 if (sdkp
->media_present
) {
1488 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1489 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1490 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1494 * We now have all cache related info, determine how we deal
1495 * with ordered requests. Note that as the current SCSI
1496 * dispatch function can alter request order, we cannot use
1497 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1500 ordered
= sdkp
->DPOFUA
1501 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1503 ordered
= QUEUE_ORDERED_DRAIN
;
1505 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1507 set_capacity(disk
, sdkp
->capacity
);
1515 * sd_probe - called during driver initialization and whenever a
1516 * new scsi device is attached to the system. It is called once
1517 * for each scsi device (not just disks) present.
1518 * @dev: pointer to device object
1520 * Returns 0 if successful (or not interested in this scsi device
1521 * (e.g. scanner)); 1 when there is an error.
1523 * Note: this function is invoked from the scsi mid-level.
1524 * This function sets up the mapping between a given
1525 * <host,channel,id,lun> (found in sdp) and new device name
1526 * (e.g. /dev/sda). More precisely it is the block device major
1527 * and minor number that is chosen here.
1529 * Assume sd_attach is not re-entrant (for time being)
1530 * Also think about sd_attach() and sd_remove() running coincidentally.
1532 static int sd_probe(struct device
*dev
)
1534 struct scsi_device
*sdp
= to_scsi_device(dev
);
1535 struct scsi_disk
*sdkp
;
1541 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1544 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1548 sdkp
= kmalloc(sizeof(*sdkp
), GFP_KERNEL
);
1552 memset (sdkp
, 0, sizeof(*sdkp
));
1553 kref_init(&sdkp
->kref
);
1555 gd
= alloc_disk(16);
1559 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1562 spin_lock(&sd_index_lock
);
1563 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1564 spin_unlock(&sd_index_lock
);
1566 if (index
>= SD_MAX_DISKS
)
1571 get_device(&sdp
->sdev_gendev
);
1573 sdkp
->driver
= &sd_template
;
1575 sdkp
->index
= index
;
1578 if (!sdp
->timeout
) {
1579 if (sdp
->type
!= TYPE_MOD
)
1580 sdp
->timeout
= SD_TIMEOUT
;
1582 sdp
->timeout
= SD_MOD_TIMEOUT
;
1585 gd
->major
= sd_major((index
& 0xf0) >> 4);
1586 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1588 gd
->fops
= &sd_fops
;
1591 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1592 } else if (index
< (26 + 1) * 26) {
1593 sprintf(gd
->disk_name
, "sd%c%c",
1594 'a' + index
/ 26 - 1,'a' + index
% 26);
1596 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1597 const unsigned int m2
= (index
/ 26 - 1) % 26;
1598 const unsigned int m3
= index
% 26;
1599 sprintf(gd
->disk_name
, "sd%c%c%c",
1600 'a' + m1
, 'a' + m2
, 'a' + m3
);
1603 strcpy(gd
->devfs_name
, sdp
->devfs_name
);
1605 gd
->private_data
= &sdkp
->driver
;
1606 gd
->queue
= sdkp
->device
->request_queue
;
1608 sd_revalidate_disk(gd
);
1610 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1611 gd
->flags
= GENHD_FL_DRIVERFS
;
1613 gd
->flags
|= GENHD_FL_REMOVABLE
;
1615 dev_set_drvdata(dev
, sdkp
);
1618 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1619 sdp
->removable
? "removable " : "", gd
->disk_name
);
1632 * sd_remove - called whenever a scsi disk (previously recognized by
1633 * sd_probe) is detached from the system. It is called (potentially
1634 * multiple times) during sd module unload.
1635 * @sdp: pointer to mid level scsi device object
1637 * Note: this function is invoked from the scsi mid-level.
1638 * This function potentially frees up a device name (e.g. /dev/sdc)
1639 * that could be re-used by a subsequent sd_probe().
1640 * This function is not called when the built-in sd driver is "exit-ed".
1642 static int sd_remove(struct device
*dev
)
1644 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1646 del_gendisk(sdkp
->disk
);
1650 dev_set_drvdata(dev
, NULL
);
1651 kref_put(&sdkp
->kref
, scsi_disk_release
);
1658 * scsi_disk_release - Called to free the scsi_disk structure
1659 * @kref: pointer to embedded kref
1661 * sd_ref_sem must be held entering this routine. Because it is
1662 * called on last put, you should always use the scsi_disk_get()
1663 * scsi_disk_put() helpers which manipulate the semaphore directly
1664 * and never do a direct kref_put().
1666 static void scsi_disk_release(struct kref
*kref
)
1668 struct scsi_disk
*sdkp
= to_scsi_disk(kref
);
1669 struct gendisk
*disk
= sdkp
->disk
;
1671 spin_lock(&sd_index_lock
);
1672 idr_remove(&sd_index_idr
, sdkp
->index
);
1673 spin_unlock(&sd_index_lock
);
1675 disk
->private_data
= NULL
;
1677 put_device(&sdkp
->device
->sdev_gendev
);
1683 * Send a SYNCHRONIZE CACHE instruction down to the device through
1684 * the normal SCSI command structure. Wait for the command to
1687 static void sd_shutdown(struct device
*dev
)
1689 struct scsi_device
*sdp
= to_scsi_device(dev
);
1690 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1693 return; /* this can happen */
1696 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1697 sdkp
->disk
->disk_name
);
1700 scsi_disk_put(sdkp
);
1704 * init_sd - entry point for this driver (both when built in or when
1707 * Note: this function registers this driver with the scsi mid-level.
1709 static int __init
init_sd(void)
1713 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1715 for (i
= 0; i
< SD_MAJORS
; i
++)
1716 if (register_blkdev(sd_major(i
), "sd") == 0)
1722 return scsi_register_driver(&sd_template
.gendrv
);
1726 * exit_sd - exit point for this driver (when it is a module).
1728 * Note: this function unregisters this driver from the scsi mid-level.
1730 static void __exit
exit_sd(void)
1734 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1736 scsi_unregister_driver(&sd_template
.gendrv
);
1737 for (i
= 0; i
< SD_MAJORS
; i
++)
1738 unregister_blkdev(sd_major(i
), "sd");
1741 MODULE_LICENSE("GPL");
1742 MODULE_AUTHOR("Eric Youngdale");
1743 MODULE_DESCRIPTION("SCSI disk (sd) driver");
1745 module_init(init_sd
);
1746 module_exit(exit_sd
);