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_end_flush(request_queue_t
*, struct request
*);
125 static int 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
,
140 .prepare_flush
= sd_prepare_flush
,
141 .end_flush
= sd_end_flush
,
145 * Device no to disk mapping:
147 * major disc2 disc p1
148 * |............|.............|....|....| <- dev_t
151 * Inside a major, we have 16k disks, however mapped non-
152 * contiguously. The first 16 disks are for major0, the next
153 * ones with major1, ... Disk 256 is for major0 again, disk 272
155 * As we stay compatible with our numbering scheme, we can reuse
156 * the well-know SCSI majors 8, 65--71, 136--143.
158 static int sd_major(int major_idx
)
162 return SCSI_DISK0_MAJOR
;
164 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
166 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
169 return 0; /* shut up gcc */
173 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref)
175 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
177 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
180 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
182 struct scsi_disk
*sdkp
= NULL
;
184 if (disk
->private_data
) {
185 sdkp
= scsi_disk(disk
);
186 if (scsi_device_get(sdkp
->device
) == 0)
187 kref_get(&sdkp
->kref
);
194 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
196 struct scsi_disk
*sdkp
;
199 sdkp
= __scsi_disk_get(disk
);
204 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
206 struct scsi_disk
*sdkp
;
209 sdkp
= dev_get_drvdata(dev
);
211 sdkp
= __scsi_disk_get(sdkp
->disk
);
216 static void scsi_disk_put(struct scsi_disk
*sdkp
)
218 struct scsi_device
*sdev
= sdkp
->device
;
221 kref_put(&sdkp
->kref
, scsi_disk_release
);
222 scsi_device_put(sdev
);
227 * sd_init_command - build a scsi (read or write) command from
228 * information in the request structure.
229 * @SCpnt: pointer to mid-level's per scsi command structure that
230 * contains request and into which the scsi command is written
232 * Returns 1 if successful and 0 if error (or cannot be done now).
234 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
236 unsigned int this_count
, timeout
;
237 struct gendisk
*disk
;
239 struct scsi_device
*sdp
= SCpnt
->device
;
240 struct request
*rq
= SCpnt
->request
;
242 timeout
= sdp
->timeout
;
245 * SG_IO from block layer already setup, just copy cdb basically
247 if (blk_pc_request(rq
)) {
248 scsi_setup_blk_pc_cmnd(SCpnt
, SD_PASSTHROUGH_RETRIES
);
250 timeout
= rq
->timeout
;
256 * we only do REQ_CMD and REQ_BLOCK_PC
258 if (!blk_fs_request(rq
))
263 this_count
= SCpnt
->request_bufflen
>> 9;
265 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
266 "count=%d\n", disk
->disk_name
,
267 (unsigned long long)block
, this_count
));
269 if (!sdp
|| !scsi_device_online(sdp
) ||
270 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
271 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
273 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
279 * quietly refuse to do anything to a changed disc until
280 * the changed bit has been reset
282 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
285 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
286 disk
->disk_name
, (unsigned long long)block
));
289 * If we have a 1K hardware sectorsize, prevent access to single
290 * 512 byte sectors. In theory we could handle this - in fact
291 * the scsi cdrom driver must be able to handle this because
292 * we typically use 1K blocksizes, and cdroms typically have
293 * 2K hardware sectorsizes. Of course, things are simpler
294 * with the cdrom, since it is read-only. For performance
295 * reasons, the filesystems should be able to handle this
296 * and not force the scsi disk driver to use bounce buffers
299 if (sdp
->sector_size
== 1024) {
300 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
301 printk(KERN_ERR
"sd: Bad block number requested");
305 this_count
= this_count
>> 1;
308 if (sdp
->sector_size
== 2048) {
309 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
310 printk(KERN_ERR
"sd: Bad block number requested");
314 this_count
= this_count
>> 2;
317 if (sdp
->sector_size
== 4096) {
318 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
319 printk(KERN_ERR
"sd: Bad block number requested");
323 this_count
= this_count
>> 3;
326 if (rq_data_dir(rq
) == WRITE
) {
327 if (!sdp
->writeable
) {
330 SCpnt
->cmnd
[0] = WRITE_6
;
331 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
332 } else if (rq_data_dir(rq
) == READ
) {
333 SCpnt
->cmnd
[0] = READ_6
;
334 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
336 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
337 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
341 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
342 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
343 "writing" : "reading", this_count
, rq
->nr_sectors
));
347 if (block
> 0xffffffff) {
348 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
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
[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 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
377 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
378 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
379 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
382 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
383 this_count
* sdp
->sector_size
;
386 * We shouldn't disconnect in the middle of a sector, so with a dumb
387 * host adapter, it's safe to assume that we can at least transfer
388 * this many bytes between each connect / disconnect.
390 SCpnt
->transfersize
= sdp
->sector_size
;
391 SCpnt
->underflow
= this_count
<< 9;
392 SCpnt
->allowed
= SD_MAX_RETRIES
;
395 SCpnt
->timeout_per_command
= timeout
;
398 * This is the completion routine we use. This is matched in terms
399 * of capability to this function.
401 SCpnt
->done
= sd_rw_intr
;
404 * This indicates that the command is ready from our end to be
411 * sd_open - open a scsi disk device
412 * @inode: only i_rdev member may be used
413 * @filp: only f_mode and f_flags may be used
415 * Returns 0 if successful. Returns a negated errno value in case
418 * Note: This can be called from a user context (e.g. fsck(1) )
419 * or from within the kernel (e.g. as a result of a mount(1) ).
420 * In the latter case @inode and @filp carry an abridged amount
421 * of information as noted above.
423 static int sd_open(struct inode
*inode
, struct file
*filp
)
425 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
426 struct scsi_disk
*sdkp
;
427 struct scsi_device
*sdev
;
430 if (!(sdkp
= scsi_disk_get(disk
)))
434 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
439 * If the device is in error recovery, wait until it is done.
440 * If the device is offline, then disallow any access to it.
443 if (!scsi_block_when_processing_errors(sdev
))
446 if (sdev
->removable
|| sdkp
->write_prot
)
447 check_disk_change(inode
->i_bdev
);
450 * If the drive is empty, just let the open fail.
453 if (sdev
->removable
&& !sdkp
->media_present
&&
454 !(filp
->f_flags
& O_NDELAY
))
458 * If the device has the write protect tab set, have the open fail
459 * if the user expects to be able to write to the thing.
462 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
466 * It is possible that the disk changing stuff resulted in
467 * the device being taken offline. If this is the case,
468 * report this to the user, and don't pretend that the
469 * open actually succeeded.
472 if (!scsi_device_online(sdev
))
475 if (!sdkp
->openers
++ && sdev
->removable
) {
476 if (scsi_block_when_processing_errors(sdev
))
477 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
488 * sd_release - invoked when the (last) close(2) is called on this
490 * @inode: only i_rdev member may be used
491 * @filp: only f_mode and f_flags may be used
495 * Note: may block (uninterruptible) if error recovery is underway
498 static int sd_release(struct inode
*inode
, struct file
*filp
)
500 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
501 struct scsi_disk
*sdkp
= scsi_disk(disk
);
502 struct scsi_device
*sdev
= sdkp
->device
;
504 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
506 if (!--sdkp
->openers
&& sdev
->removable
) {
507 if (scsi_block_when_processing_errors(sdev
))
508 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
512 * XXX and what if there are packets in flight and this close()
513 * XXX is followed by a "rmmod sd_mod"?
519 static int sd_hdio_getgeo(struct block_device
*bdev
, struct hd_geometry __user
*loc
)
521 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
522 struct scsi_device
*sdp
= sdkp
->device
;
523 struct Scsi_Host
*host
= sdp
->host
;
526 /* default to most commonly used values */
527 diskinfo
[0] = 0x40; /* 1 << 6 */
528 diskinfo
[1] = 0x20; /* 1 << 5 */
529 diskinfo
[2] = sdkp
->capacity
>> 11;
531 /* override with calculated, extended default, or driver values */
532 if (host
->hostt
->bios_param
)
533 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
535 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
537 if (put_user(diskinfo
[0], &loc
->heads
))
539 if (put_user(diskinfo
[1], &loc
->sectors
))
541 if (put_user(diskinfo
[2], &loc
->cylinders
))
543 if (put_user((unsigned)get_start_sect(bdev
),
544 (unsigned long __user
*)&loc
->start
))
550 * sd_ioctl - process an ioctl
551 * @inode: only i_rdev/i_bdev members may be used
552 * @filp: only f_mode and f_flags may be used
553 * @cmd: ioctl command number
554 * @arg: this is third argument given to ioctl(2) system call.
555 * Often contains a pointer.
557 * Returns 0 if successful (some ioctls return postive numbers on
558 * success as well). Returns a negated errno value in case of error.
560 * Note: most ioctls are forward onto the block subsystem or further
561 * down in the scsi subsytem.
563 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
564 unsigned int cmd
, unsigned long arg
)
566 struct block_device
*bdev
= inode
->i_bdev
;
567 struct gendisk
*disk
= bdev
->bd_disk
;
568 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
569 void __user
*p
= (void __user
*)arg
;
572 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
573 disk
->disk_name
, cmd
));
576 * If we are in the middle of error recovery, don't let anyone
577 * else try and use this device. Also, if error recovery fails, it
578 * may try and take the device offline, in which case all further
579 * access to the device is prohibited.
581 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
582 if (!scsi_block_when_processing_errors(sdp
) || !error
)
585 if (cmd
== HDIO_GETGEO
) {
588 return sd_hdio_getgeo(bdev
, p
);
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_end_flush(request_queue_t
*q
, struct request
*flush_rq
)
734 struct request
*rq
= flush_rq
->end_io_data
;
735 struct scsi_cmnd
*cmd
= rq
->special
;
736 unsigned int bytes
= rq
->hard_nr_sectors
<< 9;
738 if (!flush_rq
->errors
) {
739 spin_unlock(q
->queue_lock
);
740 scsi_io_completion(cmd
, bytes
, 0);
741 spin_lock(q
->queue_lock
);
742 } else if (blk_barrier_postflush(rq
)) {
743 spin_unlock(q
->queue_lock
);
744 scsi_io_completion(cmd
, 0, bytes
);
745 spin_lock(q
->queue_lock
);
748 * force journal abort of barriers
750 end_that_request_first(rq
, -EOPNOTSUPP
, rq
->hard_nr_sectors
);
751 end_that_request_last(rq
);
755 static int sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
757 struct scsi_device
*sdev
= q
->queuedata
;
758 struct scsi_disk
*sdkp
= dev_get_drvdata(&sdev
->sdev_gendev
);
760 if (!sdkp
|| !sdkp
->WCE
)
763 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
764 rq
->flags
|= REQ_BLOCK_PC
| REQ_SOFTBARRIER
;
765 rq
->timeout
= SD_TIMEOUT
;
766 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
770 static void sd_rescan(struct device
*dev
)
772 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
775 sd_revalidate_disk(sdkp
->disk
);
783 * This gets directly called from VFS. When the ioctl
784 * is not recognized we go back to the other translation paths.
786 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
788 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
789 struct gendisk
*disk
= bdev
->bd_disk
;
790 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
793 * If we are in the middle of error recovery, don't let anyone
794 * else try and use this device. Also, if error recovery fails, it
795 * may try and take the device offline, in which case all further
796 * access to the device is prohibited.
798 if (!scsi_block_when_processing_errors(sdev
))
801 if (sdev
->host
->hostt
->compat_ioctl
) {
804 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
810 * Let the static ioctl translation table take care of it.
816 static struct block_device_operations sd_fops
= {
817 .owner
= THIS_MODULE
,
819 .release
= sd_release
,
822 .compat_ioctl
= sd_compat_ioctl
,
824 .media_changed
= sd_media_changed
,
825 .revalidate_disk
= sd_revalidate_disk
,
829 * sd_rw_intr - bottom half handler: called when the lower level
830 * driver has completed (successfully or otherwise) a scsi command.
831 * @SCpnt: mid-level's per command structure.
833 * Note: potentially run from within an ISR. Must not block.
835 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
837 int result
= SCpnt
->result
;
838 int this_count
= SCpnt
->bufflen
;
839 int good_bytes
= (result
== 0 ? this_count
: 0);
840 sector_t block_sectors
= 1;
842 sector_t error_sector
;
843 struct scsi_sense_hdr sshdr
;
845 int sense_deferred
= 0;
849 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
851 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
854 #ifdef CONFIG_SCSI_LOGGING
855 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
856 SCpnt
->request
->rq_disk
->disk_name
, result
));
858 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
859 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
860 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
864 Handle MEDIUM ERRORs that indicate partial success. Since this is a
865 relatively rare error condition, no care is taken to avoid
866 unnecessary additional work such as memcpy's that could be avoided.
870 * If SG_IO from block layer then set good_bytes to stop retries;
871 * else if errors, check them, and if necessary prepare for
874 if (blk_pc_request(SCpnt
->request
))
875 good_bytes
= this_count
;
876 else if (driver_byte(result
) != 0 &&
877 sense_valid
&& !sense_deferred
) {
878 switch (sshdr
.sense_key
) {
880 if (!blk_fs_request(SCpnt
->request
))
882 info_valid
= scsi_get_sense_info_fld(
883 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
886 * May want to warn and skip if following cast results
887 * in actual truncation (if sector_t < 64 bits)
889 error_sector
= (sector_t
)first_err_block
;
890 if (SCpnt
->request
->bio
!= NULL
)
891 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
892 switch (SCpnt
->device
->sector_size
) {
895 if (block_sectors
< 2)
900 if (block_sectors
< 4)
905 if (block_sectors
< 8)
915 error_sector
&= ~(block_sectors
- 1);
916 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
917 if (good_bytes
< 0 || good_bytes
>= this_count
)
921 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
922 case NO_SENSE
: /* LLDD got sense data */
924 * Inform the user, but make sure that it's not treated
927 scsi_print_sense("sd", SCpnt
);
929 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
930 good_bytes
= this_count
;
933 case ILLEGAL_REQUEST
:
934 if (SCpnt
->device
->use_10_for_rw
&&
935 (SCpnt
->cmnd
[0] == READ_10
||
936 SCpnt
->cmnd
[0] == WRITE_10
))
937 SCpnt
->device
->use_10_for_rw
= 0;
938 if (SCpnt
->device
->use_10_for_ms
&&
939 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
940 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
941 SCpnt
->device
->use_10_for_ms
= 0;
949 * This calls the generic completion function, now that we know
950 * how many actual sectors finished, and how many sectors we need
951 * to say have failed.
953 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
956 static int media_not_present(struct scsi_disk
*sdkp
,
957 struct scsi_sense_hdr
*sshdr
)
960 if (!scsi_sense_valid(sshdr
))
962 /* not invoked for commands that could return deferred errors */
963 if (sshdr
->sense_key
!= NOT_READY
&&
964 sshdr
->sense_key
!= UNIT_ATTENTION
)
966 if (sshdr
->asc
!= 0x3A) /* medium not present */
969 set_media_not_present(sdkp
);
974 * spinup disk - called only in sd_revalidate_disk()
977 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
979 unsigned char cmd
[10];
980 unsigned long spintime_expire
= 0;
981 int retries
, spintime
;
982 unsigned int the_result
;
983 struct scsi_sense_hdr sshdr
;
988 /* Spin up drives, as required. Only do this at boot time */
989 /* Spinup needs to be done for module loads too. */
994 cmd
[0] = TEST_UNIT_READY
;
995 memset((void *) &cmd
[1], 0, 9);
997 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1003 sense_valid
= scsi_sense_valid(&sshdr
);
1005 } while (retries
< 3 &&
1006 (!scsi_status_is_good(the_result
) ||
1007 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1008 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1011 * If the drive has indicated to us that it doesn't have
1012 * any media in it, don't bother with any of the rest of
1015 if (media_not_present(sdkp
, &sshdr
))
1018 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1019 /* no sense, TUR either succeeded or failed
1020 * with a status error */
1021 if(!spintime
&& !scsi_status_is_good(the_result
))
1022 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1023 "error = 0x%x\n", diskname
, the_result
);
1028 * The device does not want the automatic start to be issued.
1030 if (sdkp
->device
->no_start_on_add
) {
1035 * If manual intervention is required, or this is an
1036 * absent USB storage device, a spinup is meaningless.
1039 sshdr
.sense_key
== NOT_READY
&&
1040 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1041 break; /* manual intervention required */
1044 * Issue command to spin up drive when not ready
1046 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1048 printk(KERN_NOTICE
"%s: Spinning up disk...",
1050 cmd
[0] = START_STOP
;
1051 cmd
[1] = 1; /* Return immediately */
1052 memset((void *) &cmd
[2], 0, 8);
1053 cmd
[4] = 1; /* Start spin cycle */
1054 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1056 SD_TIMEOUT
, SD_MAX_RETRIES
);
1057 spintime_expire
= jiffies
+ 100 * HZ
;
1060 /* Wait 1 second for next try */
1065 * Wait for USB flash devices with slow firmware.
1066 * Yes, this sense key/ASC combination shouldn't
1067 * occur here. It's characteristic of these devices.
1069 } else if (sense_valid
&&
1070 sshdr
.sense_key
== UNIT_ATTENTION
&&
1071 sshdr
.asc
== 0x28) {
1073 spintime_expire
= jiffies
+ 5 * HZ
;
1076 /* Wait 1 second for next try */
1079 /* we don't understand the sense code, so it's
1080 * probably pointless to loop */
1082 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1083 "sense:\n", diskname
);
1084 scsi_print_sense_hdr("", &sshdr
);
1089 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1092 if (scsi_status_is_good(the_result
))
1095 printk("not responding...\n");
1100 * read disk capacity
1103 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1104 unsigned char *buffer
)
1106 unsigned char cmd
[16];
1107 int the_result
, retries
;
1108 int sector_size
= 0;
1110 struct scsi_sense_hdr sshdr
;
1111 int sense_valid
= 0;
1112 struct scsi_device
*sdp
= sdkp
->device
;
1118 memset((void *) cmd
, 0, 16);
1119 cmd
[0] = SERVICE_ACTION_IN
;
1120 cmd
[1] = SAI_READ_CAPACITY_16
;
1122 memset((void *) buffer
, 0, 12);
1124 cmd
[0] = READ_CAPACITY
;
1125 memset((void *) &cmd
[1], 0, 9);
1126 memset((void *) buffer
, 0, 8);
1129 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1130 buffer
, longrc
? 12 : 8, &sshdr
,
1131 SD_TIMEOUT
, SD_MAX_RETRIES
);
1133 if (media_not_present(sdkp
, &sshdr
))
1137 sense_valid
= scsi_sense_valid(&sshdr
);
1140 } while (the_result
&& retries
);
1142 if (the_result
&& !longrc
) {
1143 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1144 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1146 status_byte(the_result
),
1147 msg_byte(the_result
),
1148 host_byte(the_result
),
1149 driver_byte(the_result
));
1151 if (driver_byte(the_result
) & DRIVER_SENSE
)
1152 scsi_print_sense_hdr("sd", &sshdr
);
1154 printk("%s : sense not available. \n", diskname
);
1156 /* Set dirty bit for removable devices if not ready -
1157 * sometimes drives will not report this properly. */
1158 if (sdp
->removable
&&
1159 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1162 /* Either no media are present but the drive didn't tell us,
1163 or they are present but the read capacity command fails */
1164 /* sdkp->media_present = 0; -- not always correct */
1165 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1168 } else if (the_result
&& longrc
) {
1169 /* READ CAPACITY(16) has been failed */
1170 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1171 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1173 status_byte(the_result
),
1174 msg_byte(the_result
),
1175 host_byte(the_result
),
1176 driver_byte(the_result
));
1177 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1180 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1185 sector_size
= (buffer
[4] << 24) |
1186 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1187 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1188 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1189 if(sizeof(sdkp
->capacity
) > 4) {
1190 printk(KERN_NOTICE
"%s : very big device. try to use"
1191 " READ CAPACITY(16).\n", diskname
);
1195 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1196 "kernel compiled with support for large block "
1197 "devices.\n", diskname
);
1201 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1206 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1207 ((u64
)buffer
[1] << 48) |
1208 ((u64
)buffer
[2] << 40) |
1209 ((u64
)buffer
[3] << 32) |
1210 ((sector_t
)buffer
[4] << 24) |
1211 ((sector_t
)buffer
[5] << 16) |
1212 ((sector_t
)buffer
[6] << 8) |
1213 (sector_t
)buffer
[7]);
1215 sector_size
= (buffer
[8] << 24) |
1216 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1219 /* Some devices return the total number of sectors, not the
1220 * highest sector number. Make the necessary adjustment. */
1221 if (sdp
->fix_capacity
)
1225 if (sector_size
== 0) {
1227 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1228 "assuming 512.\n", diskname
);
1231 if (sector_size
!= 512 &&
1232 sector_size
!= 1024 &&
1233 sector_size
!= 2048 &&
1234 sector_size
!= 4096 &&
1235 sector_size
!= 256) {
1236 printk(KERN_NOTICE
"%s : unsupported sector size "
1237 "%d.\n", diskname
, sector_size
);
1239 * The user might want to re-format the drive with
1240 * a supported sectorsize. Once this happens, it
1241 * would be relatively trivial to set the thing up.
1242 * For this reason, we leave the thing in the table.
1246 * set a bogus sector size so the normal read/write
1247 * logic in the block layer will eventually refuse any
1248 * request on this device without tripping over power
1249 * of two sector size assumptions
1255 * The msdos fs needs to know the hardware sector size
1256 * So I have created this table. See ll_rw_blk.c
1257 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1259 int hard_sector
= sector_size
;
1260 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1261 request_queue_t
*queue
= sdp
->request_queue
;
1264 blk_queue_hardsect_size(queue
, hard_sector
);
1265 /* avoid 64-bit division on 32-bit platforms */
1266 sector_div(sz
, 625);
1268 sector_div(mb
, 1950);
1270 printk(KERN_NOTICE
"SCSI device %s: "
1271 "%llu %d-byte hdwr sectors (%llu MB)\n",
1272 diskname
, (unsigned long long)sdkp
->capacity
,
1273 hard_sector
, (unsigned long long)mb
);
1276 /* Rescale capacity to 512-byte units */
1277 if (sector_size
== 4096)
1278 sdkp
->capacity
<<= 3;
1279 else if (sector_size
== 2048)
1280 sdkp
->capacity
<<= 2;
1281 else if (sector_size
== 1024)
1282 sdkp
->capacity
<<= 1;
1283 else if (sector_size
== 256)
1284 sdkp
->capacity
>>= 1;
1286 sdkp
->device
->sector_size
= sector_size
;
1289 /* called with buffer of length 512 */
1291 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1292 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1293 struct scsi_sense_hdr
*sshdr
)
1295 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1296 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1301 * read write protect setting, if possible - called only in sd_revalidate_disk()
1302 * called with buffer of length 512
1305 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1306 unsigned char *buffer
)
1309 struct scsi_device
*sdp
= sdkp
->device
;
1310 struct scsi_mode_data data
;
1312 set_disk_ro(sdkp
->disk
, 0);
1313 if (sdp
->skip_ms_page_3f
) {
1314 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1318 if (sdp
->use_192_bytes_for_3f
) {
1319 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1322 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1323 * We have to start carefully: some devices hang if we ask
1324 * for more than is available.
1326 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1329 * Second attempt: ask for page 0 When only page 0 is
1330 * implemented, a request for page 3F may return Sense Key
1331 * 5: Illegal Request, Sense Code 24: Invalid field in
1334 if (!scsi_status_is_good(res
))
1335 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1338 * Third attempt: ask 255 bytes, as we did earlier.
1340 if (!scsi_status_is_good(res
))
1341 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1345 if (!scsi_status_is_good(res
)) {
1347 "%s: test WP failed, assume Write Enabled\n", diskname
);
1349 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1350 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1351 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1352 sdkp
->write_prot
? "on" : "off");
1353 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1354 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1359 * sd_read_cache_type - called only from sd_revalidate_disk()
1360 * called with buffer of length 512
1363 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1364 unsigned char *buffer
)
1367 struct scsi_device
*sdp
= sdkp
->device
;
1371 struct scsi_mode_data data
;
1372 struct scsi_sense_hdr sshdr
;
1374 if (sdp
->skip_ms_page_8
)
1377 if (sdp
->type
== TYPE_RBC
) {
1385 /* cautiously ask */
1386 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1388 if (!scsi_status_is_good(res
))
1391 /* that went OK, now ask for the proper length */
1395 * We're only interested in the first three bytes, actually.
1396 * But the data cache page is defined for the first 20.
1403 /* Take headers and block descriptors into account */
1404 len
+= data
.header_length
+ data
.block_descriptor_length
;
1407 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1409 if (scsi_status_is_good(res
)) {
1410 const char *types
[] = {
1411 "write through", "none", "write back",
1412 "write back, no read (daft)"
1415 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1417 if ((buffer
[offset
] & 0x3f) != modepage
) {
1418 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1422 if (modepage
== 8) {
1423 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1424 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1426 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1430 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1432 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s\n",
1433 diskname
, types
[ct
]);
1439 if (scsi_sense_valid(&sshdr
) &&
1440 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1441 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1442 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1443 diskname
); /* Invalid field in CDB */
1445 printk(KERN_ERR
"%s: asking for cache data failed\n",
1449 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1456 * sd_revalidate_disk - called the first time a new disk is seen,
1457 * performs disk spin up, read_capacity, etc.
1458 * @disk: struct gendisk we care about
1460 static int sd_revalidate_disk(struct gendisk
*disk
)
1462 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1463 struct scsi_device
*sdp
= sdkp
->device
;
1464 unsigned char *buffer
;
1466 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1469 * If the device is offline, don't try and read capacity or any
1470 * of the other niceties.
1472 if (!scsi_device_online(sdp
))
1475 buffer
= kmalloc(512, GFP_KERNEL
| __GFP_DMA
);
1477 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1482 /* defaults, until the device tells us otherwise */
1483 sdp
->sector_size
= 512;
1485 sdkp
->media_present
= 1;
1486 sdkp
->write_prot
= 0;
1490 sd_spinup_disk(sdkp
, disk
->disk_name
);
1493 * Without media there is no reason to ask; moreover, some devices
1494 * react badly if we do.
1496 if (sdkp
->media_present
) {
1497 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1499 sd_read_write_protect_flag(sdkp
, disk
->disk_name
,
1501 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1504 set_capacity(disk
, sdkp
->capacity
);
1512 * sd_probe - called during driver initialization and whenever a
1513 * new scsi device is attached to the system. It is called once
1514 * for each scsi device (not just disks) present.
1515 * @dev: pointer to device object
1517 * Returns 0 if successful (or not interested in this scsi device
1518 * (e.g. scanner)); 1 when there is an error.
1520 * Note: this function is invoked from the scsi mid-level.
1521 * This function sets up the mapping between a given
1522 * <host,channel,id,lun> (found in sdp) and new device name
1523 * (e.g. /dev/sda). More precisely it is the block device major
1524 * and minor number that is chosen here.
1526 * Assume sd_attach is not re-entrant (for time being)
1527 * Also think about sd_attach() and sd_remove() running coincidentally.
1529 static int sd_probe(struct device
*dev
)
1531 struct scsi_device
*sdp
= to_scsi_device(dev
);
1532 struct scsi_disk
*sdkp
;
1538 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1541 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1545 sdkp
= kmalloc(sizeof(*sdkp
), GFP_KERNEL
);
1549 memset (sdkp
, 0, sizeof(*sdkp
));
1550 kref_init(&sdkp
->kref
);
1552 gd
= alloc_disk(16);
1556 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1559 spin_lock(&sd_index_lock
);
1560 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1561 spin_unlock(&sd_index_lock
);
1563 if (index
>= SD_MAX_DISKS
)
1568 get_device(&sdp
->sdev_gendev
);
1570 sdkp
->driver
= &sd_template
;
1572 sdkp
->index
= index
;
1575 if (!sdp
->timeout
) {
1576 if (sdp
->type
!= TYPE_MOD
)
1577 sdp
->timeout
= SD_TIMEOUT
;
1579 sdp
->timeout
= SD_MOD_TIMEOUT
;
1582 gd
->major
= sd_major((index
& 0xf0) >> 4);
1583 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1585 gd
->fops
= &sd_fops
;
1588 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1589 } else if (index
< (26 + 1) * 26) {
1590 sprintf(gd
->disk_name
, "sd%c%c",
1591 'a' + index
/ 26 - 1,'a' + index
% 26);
1593 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1594 const unsigned int m2
= (index
/ 26 - 1) % 26;
1595 const unsigned int m3
= index
% 26;
1596 sprintf(gd
->disk_name
, "sd%c%c%c",
1597 'a' + m1
, 'a' + m2
, 'a' + m3
);
1600 strcpy(gd
->devfs_name
, sdp
->devfs_name
);
1602 gd
->private_data
= &sdkp
->driver
;
1604 sd_revalidate_disk(gd
);
1606 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1607 gd
->flags
= GENHD_FL_DRIVERFS
;
1609 gd
->flags
|= GENHD_FL_REMOVABLE
;
1610 gd
->queue
= sdkp
->device
->request_queue
;
1612 dev_set_drvdata(dev
, sdkp
);
1615 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1616 sdp
->removable
? "removable " : "", gd
->disk_name
);
1629 * sd_remove - called whenever a scsi disk (previously recognized by
1630 * sd_probe) is detached from the system. It is called (potentially
1631 * multiple times) during sd module unload.
1632 * @sdp: pointer to mid level scsi device object
1634 * Note: this function is invoked from the scsi mid-level.
1635 * This function potentially frees up a device name (e.g. /dev/sdc)
1636 * that could be re-used by a subsequent sd_probe().
1637 * This function is not called when the built-in sd driver is "exit-ed".
1639 static int sd_remove(struct device
*dev
)
1641 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1643 del_gendisk(sdkp
->disk
);
1647 dev_set_drvdata(dev
, NULL
);
1648 kref_put(&sdkp
->kref
, scsi_disk_release
);
1655 * scsi_disk_release - Called to free the scsi_disk structure
1656 * @kref: pointer to embedded kref
1658 * sd_ref_sem must be held entering this routine. Because it is
1659 * called on last put, you should always use the scsi_disk_get()
1660 * scsi_disk_put() helpers which manipulate the semaphore directly
1661 * and never do a direct kref_put().
1663 static void scsi_disk_release(struct kref
*kref
)
1665 struct scsi_disk
*sdkp
= to_scsi_disk(kref
);
1666 struct gendisk
*disk
= sdkp
->disk
;
1668 spin_lock(&sd_index_lock
);
1669 idr_remove(&sd_index_idr
, sdkp
->index
);
1670 spin_unlock(&sd_index_lock
);
1672 disk
->private_data
= NULL
;
1674 put_device(&sdkp
->device
->sdev_gendev
);
1680 * Send a SYNCHRONIZE CACHE instruction down to the device through
1681 * the normal SCSI command structure. Wait for the command to
1684 static void sd_shutdown(struct device
*dev
)
1686 struct scsi_device
*sdp
= to_scsi_device(dev
);
1687 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1690 return; /* this can happen */
1693 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1694 sdkp
->disk
->disk_name
);
1697 scsi_disk_put(sdkp
);
1701 * init_sd - entry point for this driver (both when built in or when
1704 * Note: this function registers this driver with the scsi mid-level.
1706 static int __init
init_sd(void)
1710 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1712 for (i
= 0; i
< SD_MAJORS
; i
++)
1713 if (register_blkdev(sd_major(i
), "sd") == 0)
1719 return scsi_register_driver(&sd_template
.gendrv
);
1723 * exit_sd - exit point for this driver (when it is a module).
1725 * Note: this function unregisters this driver from the scsi mid-level.
1727 static void __exit
exit_sd(void)
1731 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1733 scsi_unregister_driver(&sd_template
.gendrv
);
1734 for (i
= 0; i
< SD_MAJORS
; i
++)
1735 unregister_blkdev(sd_major(i
), "sd");
1738 MODULE_LICENSE("GPL");
1739 MODULE_AUTHOR("Eric Youngdale");
1740 MODULE_DESCRIPTION("SCSI disk (sd) driver");
1742 module_init(init_sd
);
1743 module_exit(exit_sd
);