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/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <asm/uaccess.h>
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_eh.h>
59 #include <scsi/scsi_host.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/scsicam.h>
64 #include "scsi_logging.h"
66 MODULE_AUTHOR("Eric Youngdale");
67 MODULE_DESCRIPTION("SCSI disk (sd) driver");
68 MODULE_LICENSE("GPL");
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
90 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 static int sd_revalidate_disk(struct gendisk
*);
97 static int sd_probe(struct device
*);
98 static int sd_remove(struct device
*);
99 static void sd_shutdown(struct device
*);
100 static int sd_suspend(struct device
*, pm_message_t state
);
101 static int sd_resume(struct device
*);
102 static void sd_rescan(struct device
*);
103 static int sd_done(struct scsi_cmnd
*);
104 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
105 static void scsi_disk_release(struct device
*cdev
);
106 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
107 static void sd_print_result(struct scsi_disk
*, int);
109 static DEFINE_IDA(sd_index_ida
);
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 DEFINE_MUTEX(sd_ref_mutex
);
116 static const char *sd_cache_types
[] = {
117 "write through", "none", "write back",
118 "write back, no read (daft)"
122 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
123 const char *buf
, size_t count
)
125 int i
, ct
= -1, rcd
, wce
, sp
;
126 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
127 struct scsi_device
*sdp
= sdkp
->device
;
130 struct scsi_mode_data data
;
131 struct scsi_sense_hdr sshdr
;
134 if (sdp
->type
!= TYPE_DISK
)
135 /* no cache control on RBC devices; theoretically they
136 * can do it, but there's probably so many exceptions
137 * it's not worth the risk */
140 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
141 const int len
= strlen(sd_cache_types
[i
]);
142 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
150 rcd
= ct
& 0x01 ? 1 : 0;
151 wce
= ct
& 0x02 ? 1 : 0;
152 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
153 SD_MAX_RETRIES
, &data
, NULL
))
155 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
156 data
.block_descriptor_length
);
157 buffer_data
= buffer
+ data
.header_length
+
158 data
.block_descriptor_length
;
159 buffer_data
[2] &= ~0x05;
160 buffer_data
[2] |= wce
<< 2 | rcd
;
161 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
163 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
164 SD_MAX_RETRIES
, &data
, &sshdr
)) {
165 if (scsi_sense_valid(&sshdr
))
166 sd_print_sense_hdr(sdkp
, &sshdr
);
169 revalidate_disk(sdkp
->disk
);
174 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
175 const char *buf
, size_t count
)
177 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
178 struct scsi_device
*sdp
= sdkp
->device
;
180 if (!capable(CAP_SYS_ADMIN
))
183 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
189 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
190 const char *buf
, size_t count
)
192 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
193 struct scsi_device
*sdp
= sdkp
->device
;
195 if (!capable(CAP_SYS_ADMIN
))
198 if (sdp
->type
!= TYPE_DISK
)
201 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
207 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
210 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
211 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
213 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
217 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
219 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
221 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
225 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
228 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
229 struct scsi_device
*sdp
= sdkp
->device
;
231 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
235 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
238 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
240 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
244 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
247 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
249 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
253 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
256 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
258 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
261 static struct device_attribute sd_disk_attrs
[] = {
262 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
263 sd_store_cache_type
),
264 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
265 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
266 sd_store_allow_restart
),
267 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
268 sd_store_manage_start_stop
),
269 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
270 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
274 static struct class sd_disk_class
= {
276 .owner
= THIS_MODULE
,
277 .dev_release
= scsi_disk_release
,
278 .dev_attrs
= sd_disk_attrs
,
281 static struct scsi_driver sd_template
= {
282 .owner
= THIS_MODULE
,
287 .suspend
= sd_suspend
,
289 .shutdown
= sd_shutdown
,
296 * Device no to disk mapping:
298 * major disc2 disc p1
299 * |............|.............|....|....| <- dev_t
302 * Inside a major, we have 16k disks, however mapped non-
303 * contiguously. The first 16 disks are for major0, the next
304 * ones with major1, ... Disk 256 is for major0 again, disk 272
306 * As we stay compatible with our numbering scheme, we can reuse
307 * the well-know SCSI majors 8, 65--71, 136--143.
309 static int sd_major(int major_idx
)
313 return SCSI_DISK0_MAJOR
;
315 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
317 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
320 return 0; /* shut up gcc */
324 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
326 struct scsi_disk
*sdkp
= NULL
;
328 if (disk
->private_data
) {
329 sdkp
= scsi_disk(disk
);
330 if (scsi_device_get(sdkp
->device
) == 0)
331 get_device(&sdkp
->dev
);
338 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
340 struct scsi_disk
*sdkp
;
342 mutex_lock(&sd_ref_mutex
);
343 sdkp
= __scsi_disk_get(disk
);
344 mutex_unlock(&sd_ref_mutex
);
348 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
350 struct scsi_disk
*sdkp
;
352 mutex_lock(&sd_ref_mutex
);
353 sdkp
= dev_get_drvdata(dev
);
355 sdkp
= __scsi_disk_get(sdkp
->disk
);
356 mutex_unlock(&sd_ref_mutex
);
360 static void scsi_disk_put(struct scsi_disk
*sdkp
)
362 struct scsi_device
*sdev
= sdkp
->device
;
364 mutex_lock(&sd_ref_mutex
);
365 put_device(&sdkp
->dev
);
366 scsi_device_put(sdev
);
367 mutex_unlock(&sd_ref_mutex
);
371 * sd_init_command - build a scsi (read or write) command from
372 * information in the request structure.
373 * @SCpnt: pointer to mid-level's per scsi command structure that
374 * contains request and into which the scsi command is written
376 * Returns 1 if successful and 0 if error (or cannot be done now).
378 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
380 struct scsi_cmnd
*SCpnt
;
381 struct scsi_device
*sdp
= q
->queuedata
;
382 struct gendisk
*disk
= rq
->rq_disk
;
383 struct scsi_disk
*sdkp
;
384 sector_t block
= rq
->sector
;
386 unsigned int this_count
= rq
->nr_sectors
;
389 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
390 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
392 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
396 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
397 if (ret
!= BLKPREP_OK
)
400 sdkp
= scsi_disk(disk
);
402 /* from here on until we're complete, any goto out
403 * is used for a killable error condition */
406 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
407 "sd_init_command: block=%llu, "
409 (unsigned long long)block
,
412 if (!sdp
|| !scsi_device_online(sdp
) ||
413 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
414 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
415 "Finishing %ld sectors\n",
417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
418 "Retry with 0x%p\n", SCpnt
));
424 * quietly refuse to do anything to a changed disc until
425 * the changed bit has been reset
427 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
432 * Some SD card readers can't handle multi-sector accesses which touch
433 * the last one or two hardware sectors. Split accesses as needed.
435 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
436 (sdp
->sector_size
/ 512);
438 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
439 if (block
< threshold
) {
440 /* Access up to the threshold but not beyond */
441 this_count
= threshold
- block
;
443 /* Access only a single hardware sector */
444 this_count
= sdp
->sector_size
/ 512;
448 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
449 (unsigned long long)block
));
452 * If we have a 1K hardware sectorsize, prevent access to single
453 * 512 byte sectors. In theory we could handle this - in fact
454 * the scsi cdrom driver must be able to handle this because
455 * we typically use 1K blocksizes, and cdroms typically have
456 * 2K hardware sectorsizes. Of course, things are simpler
457 * with the cdrom, since it is read-only. For performance
458 * reasons, the filesystems should be able to handle this
459 * and not force the scsi disk driver to use bounce buffers
462 if (sdp
->sector_size
== 1024) {
463 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
464 scmd_printk(KERN_ERR
, SCpnt
,
465 "Bad block number requested\n");
469 this_count
= this_count
>> 1;
472 if (sdp
->sector_size
== 2048) {
473 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
474 scmd_printk(KERN_ERR
, SCpnt
,
475 "Bad block number requested\n");
479 this_count
= this_count
>> 2;
482 if (sdp
->sector_size
== 4096) {
483 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
484 scmd_printk(KERN_ERR
, SCpnt
,
485 "Bad block number requested\n");
489 this_count
= this_count
>> 3;
492 if (rq_data_dir(rq
) == WRITE
) {
493 if (!sdp
->writeable
) {
496 SCpnt
->cmnd
[0] = WRITE_6
;
497 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
499 if (blk_integrity_rq(rq
) &&
500 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
503 } else if (rq_data_dir(rq
) == READ
) {
504 SCpnt
->cmnd
[0] = READ_6
;
505 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
507 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
511 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
512 "%s %d/%ld 512 byte blocks.\n",
513 (rq_data_dir(rq
) == WRITE
) ?
514 "writing" : "reading", this_count
,
517 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
518 if (scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
))
519 SCpnt
->cmnd
[1] = 1 << 5;
523 if (block
> 0xffffffff) {
524 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
525 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
526 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
527 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
528 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
529 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
530 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
531 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
532 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
533 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
534 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
535 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
536 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
537 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
538 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
539 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
540 scsi_device_protection(SCpnt
->device
) ||
541 SCpnt
->device
->use_10_for_rw
) {
542 if (this_count
> 0xffff)
545 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
546 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
547 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
548 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
549 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
550 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
551 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
552 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
553 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
555 if (unlikely(blk_fua_rq(rq
))) {
557 * This happens only if this drive failed
558 * 10byte rw command with ILLEGAL_REQUEST
559 * during operation and thus turned off
562 scmd_printk(KERN_ERR
, SCpnt
,
563 "FUA write on READ/WRITE(6) drive\n");
567 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
568 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
569 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
570 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
573 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
575 /* If DIF or DIX is enabled, tell HBA how to handle request */
576 if (sdkp
->protection_type
|| scsi_prot_sg_count(SCpnt
))
577 sd_dif_op(SCpnt
, sdkp
->protection_type
, scsi_prot_sg_count(SCpnt
));
580 * We shouldn't disconnect in the middle of a sector, so with a dumb
581 * host adapter, it's safe to assume that we can at least transfer
582 * this many bytes between each connect / disconnect.
584 SCpnt
->transfersize
= sdp
->sector_size
;
585 SCpnt
->underflow
= this_count
<< 9;
586 SCpnt
->allowed
= SD_MAX_RETRIES
;
589 * This indicates that the command is ready from our end to be
594 return scsi_prep_return(q
, rq
, ret
);
598 * sd_open - open a scsi disk device
599 * @inode: only i_rdev member may be used
600 * @filp: only f_mode and f_flags may be used
602 * Returns 0 if successful. Returns a negated errno value in case
605 * Note: This can be called from a user context (e.g. fsck(1) )
606 * or from within the kernel (e.g. as a result of a mount(1) ).
607 * In the latter case @inode and @filp carry an abridged amount
608 * of information as noted above.
610 static int sd_open(struct inode
*inode
, struct file
*filp
)
612 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
613 struct scsi_disk
*sdkp
;
614 struct scsi_device
*sdev
;
617 if (!(sdkp
= scsi_disk_get(disk
)))
621 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
626 * If the device is in error recovery, wait until it is done.
627 * If the device is offline, then disallow any access to it.
630 if (!scsi_block_when_processing_errors(sdev
))
633 if (sdev
->removable
|| sdkp
->write_prot
)
634 check_disk_change(inode
->i_bdev
);
637 * If the drive is empty, just let the open fail.
640 if (sdev
->removable
&& !sdkp
->media_present
&&
641 !(filp
->f_flags
& O_NDELAY
))
645 * If the device has the write protect tab set, have the open fail
646 * if the user expects to be able to write to the thing.
649 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
653 * It is possible that the disk changing stuff resulted in
654 * the device being taken offline. If this is the case,
655 * report this to the user, and don't pretend that the
656 * open actually succeeded.
659 if (!scsi_device_online(sdev
))
662 if (!sdkp
->openers
++ && sdev
->removable
) {
663 if (scsi_block_when_processing_errors(sdev
))
664 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
675 * sd_release - invoked when the (last) close(2) is called on this
677 * @inode: only i_rdev member may be used
678 * @filp: only f_mode and f_flags may be used
682 * Note: may block (uninterruptible) if error recovery is underway
685 static int sd_release(struct inode
*inode
, struct file
*filp
)
687 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
688 struct scsi_disk
*sdkp
= scsi_disk(disk
);
689 struct scsi_device
*sdev
= sdkp
->device
;
691 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
693 if (!--sdkp
->openers
&& sdev
->removable
) {
694 if (scsi_block_when_processing_errors(sdev
))
695 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
699 * XXX and what if there are packets in flight and this close()
700 * XXX is followed by a "rmmod sd_mod"?
706 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
708 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
709 struct scsi_device
*sdp
= sdkp
->device
;
710 struct Scsi_Host
*host
= sdp
->host
;
713 /* default to most commonly used values */
714 diskinfo
[0] = 0x40; /* 1 << 6 */
715 diskinfo
[1] = 0x20; /* 1 << 5 */
716 diskinfo
[2] = sdkp
->capacity
>> 11;
718 /* override with calculated, extended default, or driver values */
719 if (host
->hostt
->bios_param
)
720 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
722 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
724 geo
->heads
= diskinfo
[0];
725 geo
->sectors
= diskinfo
[1];
726 geo
->cylinders
= diskinfo
[2];
731 * sd_ioctl - process an ioctl
732 * @inode: only i_rdev/i_bdev members may be used
733 * @filp: only f_mode and f_flags may be used
734 * @cmd: ioctl command number
735 * @arg: this is third argument given to ioctl(2) system call.
736 * Often contains a pointer.
738 * Returns 0 if successful (some ioctls return postive numbers on
739 * success as well). Returns a negated errno value in case of error.
741 * Note: most ioctls are forward onto the block subsystem or further
742 * down in the scsi subsystem.
744 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
745 unsigned int cmd
, unsigned long arg
)
747 struct block_device
*bdev
= inode
->i_bdev
;
748 struct gendisk
*disk
= bdev
->bd_disk
;
749 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
750 void __user
*p
= (void __user
*)arg
;
753 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
754 disk
->disk_name
, cmd
));
757 * If we are in the middle of error recovery, don't let anyone
758 * else try and use this device. Also, if error recovery fails, it
759 * may try and take the device offline, in which case all further
760 * access to the device is prohibited.
762 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
763 if (!scsi_block_when_processing_errors(sdp
) || !error
)
767 * Send SCSI addressing ioctls directly to mid level, send other
768 * ioctls to block level and then onto mid level if they can't be
772 case SCSI_IOCTL_GET_IDLUN
:
773 case SCSI_IOCTL_GET_BUS_NUMBER
:
774 return scsi_ioctl(sdp
, cmd
, p
);
776 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
777 if (error
!= -ENOTTY
)
780 return scsi_ioctl(sdp
, cmd
, p
);
783 static void set_media_not_present(struct scsi_disk
*sdkp
)
785 sdkp
->media_present
= 0;
787 sdkp
->device
->changed
= 1;
791 * sd_media_changed - check if our medium changed
792 * @disk: kernel device descriptor
794 * Returns 0 if not applicable or no change; 1 if change
796 * Note: this function is invoked from the block subsystem.
798 static int sd_media_changed(struct gendisk
*disk
)
800 struct scsi_disk
*sdkp
= scsi_disk(disk
);
801 struct scsi_device
*sdp
= sdkp
->device
;
802 struct scsi_sense_hdr
*sshdr
= NULL
;
805 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
811 * If the device is offline, don't send any commands - just pretend as
812 * if the command failed. If the device ever comes back online, we
813 * can deal with it then. It is only because of unrecoverable errors
814 * that we would ever take a device offline in the first place.
816 if (!scsi_device_online(sdp
)) {
817 set_media_not_present(sdkp
);
823 * Using TEST_UNIT_READY enables differentiation between drive with
824 * no cartridge loaded - NOT READY, drive with changed cartridge -
825 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
827 * Drives that auto spin down. eg iomega jaz 1G, will be started
828 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
829 * sd_revalidate() is called.
833 if (scsi_block_when_processing_errors(sdp
)) {
834 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
835 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
840 * Unable to test, unit probably not ready. This usually
841 * means there is no disc in the drive. Mark as changed,
842 * and we will figure it out later once the drive is
845 if (retval
|| (scsi_sense_valid(sshdr
) &&
846 /* 0x3a is medium not present */
847 sshdr
->asc
== 0x3a)) {
848 set_media_not_present(sdkp
);
854 * For removable scsi disk we have to recognise the presence
855 * of a disk in the drive. This is kept in the struct scsi_disk
856 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
858 sdkp
->media_present
= 1;
860 retval
= sdp
->changed
;
863 if (retval
!= sdkp
->previous_state
)
864 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
865 sdkp
->previous_state
= retval
;
870 static int sd_sync_cache(struct scsi_disk
*sdkp
)
873 struct scsi_device
*sdp
= sdkp
->device
;
874 struct scsi_sense_hdr sshdr
;
876 if (!scsi_device_online(sdp
))
880 for (retries
= 3; retries
> 0; --retries
) {
881 unsigned char cmd
[10] = { 0 };
883 cmd
[0] = SYNCHRONIZE_CACHE
;
885 * Leave the rest of the command zero to indicate
888 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
889 SD_TIMEOUT
, SD_MAX_RETRIES
);
895 sd_print_result(sdkp
, res
);
896 if (driver_byte(res
) & DRIVER_SENSE
)
897 sd_print_sense_hdr(sdkp
, &sshdr
);
905 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
907 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
908 rq
->timeout
= SD_TIMEOUT
;
909 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
913 static void sd_rescan(struct device
*dev
)
915 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
918 revalidate_disk(sdkp
->disk
);
926 * This gets directly called from VFS. When the ioctl
927 * is not recognized we go back to the other translation paths.
929 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
931 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
932 struct gendisk
*disk
= bdev
->bd_disk
;
933 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
936 * If we are in the middle of error recovery, don't let anyone
937 * else try and use this device. Also, if error recovery fails, it
938 * may try and take the device offline, in which case all further
939 * access to the device is prohibited.
941 if (!scsi_block_when_processing_errors(sdev
))
944 if (sdev
->host
->hostt
->compat_ioctl
) {
947 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
953 * Let the static ioctl translation table take care of it.
959 static struct block_device_operations sd_fops
= {
960 .owner
= THIS_MODULE
,
962 .release
= sd_release
,
966 .compat_ioctl
= sd_compat_ioctl
,
968 .media_changed
= sd_media_changed
,
969 .revalidate_disk
= sd_revalidate_disk
,
972 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
974 u64 start_lba
= scmd
->request
->sector
;
975 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
979 if (!blk_fs_request(scmd
->request
))
982 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
983 SCSI_SENSE_BUFFERSIZE
,
988 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
991 if (scmd
->device
->sector_size
< 512) {
992 /* only legitimate sector_size here is 256 */
996 /* be careful ... don't want any overflows */
997 u64 factor
= scmd
->device
->sector_size
/ 512;
998 do_div(start_lba
, factor
);
999 do_div(end_lba
, factor
);
1002 /* The bad lba was reported incorrectly, we have no idea where
1005 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1008 /* This computation should always be done in terms of
1009 * the resolution of the device's medium.
1011 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1015 * sd_done - bottom half handler: called when the lower level
1016 * driver has completed (successfully or otherwise) a scsi command.
1017 * @SCpnt: mid-level's per command structure.
1019 * Note: potentially run from within an ISR. Must not block.
1021 static int sd_done(struct scsi_cmnd
*SCpnt
)
1023 int result
= SCpnt
->result
;
1024 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1025 struct scsi_sense_hdr sshdr
;
1026 int sense_valid
= 0;
1027 int sense_deferred
= 0;
1030 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1032 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1034 #ifdef CONFIG_SCSI_LOGGING
1035 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1037 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1038 "sd_done: sb[respc,sk,asc,"
1039 "ascq]=%x,%x,%x,%x\n",
1040 sshdr
.response_code
,
1041 sshdr
.sense_key
, sshdr
.asc
,
1045 if (driver_byte(result
) != DRIVER_SENSE
&&
1046 (!sense_valid
|| sense_deferred
))
1049 switch (sshdr
.sense_key
) {
1050 case HARDWARE_ERROR
:
1052 good_bytes
= sd_completed_bytes(SCpnt
);
1054 case RECOVERED_ERROR
:
1056 /* Inform the user, but make sure that it's not treated
1059 scsi_print_sense("sd", SCpnt
);
1061 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1062 good_bytes
= scsi_bufflen(SCpnt
);
1064 case ABORTED_COMMAND
:
1065 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1066 scsi_print_result(SCpnt
);
1067 scsi_print_sense("sd", SCpnt
);
1068 good_bytes
= sd_completed_bytes(SCpnt
);
1071 case ILLEGAL_REQUEST
:
1072 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1073 scsi_print_result(SCpnt
);
1074 scsi_print_sense("sd", SCpnt
);
1075 good_bytes
= sd_completed_bytes(SCpnt
);
1077 if (!scsi_device_protection(SCpnt
->device
) &&
1078 SCpnt
->device
->use_10_for_rw
&&
1079 (SCpnt
->cmnd
[0] == READ_10
||
1080 SCpnt
->cmnd
[0] == WRITE_10
))
1081 SCpnt
->device
->use_10_for_rw
= 0;
1082 if (SCpnt
->device
->use_10_for_ms
&&
1083 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1084 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1085 SCpnt
->device
->use_10_for_ms
= 0;
1091 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1092 sd_dif_complete(SCpnt
, good_bytes
);
1097 static int media_not_present(struct scsi_disk
*sdkp
,
1098 struct scsi_sense_hdr
*sshdr
)
1101 if (!scsi_sense_valid(sshdr
))
1103 /* not invoked for commands that could return deferred errors */
1104 if (sshdr
->sense_key
!= NOT_READY
&&
1105 sshdr
->sense_key
!= UNIT_ATTENTION
)
1107 if (sshdr
->asc
!= 0x3A) /* medium not present */
1110 set_media_not_present(sdkp
);
1115 * spinup disk - called only in sd_revalidate_disk()
1118 sd_spinup_disk(struct scsi_disk
*sdkp
)
1120 unsigned char cmd
[10];
1121 unsigned long spintime_expire
= 0;
1122 int retries
, spintime
;
1123 unsigned int the_result
;
1124 struct scsi_sense_hdr sshdr
;
1125 int sense_valid
= 0;
1129 /* Spin up drives, as required. Only do this at boot time */
1130 /* Spinup needs to be done for module loads too. */
1135 cmd
[0] = TEST_UNIT_READY
;
1136 memset((void *) &cmd
[1], 0, 9);
1138 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1144 * If the drive has indicated to us that it
1145 * doesn't have any media in it, don't bother
1146 * with any more polling.
1148 if (media_not_present(sdkp
, &sshdr
))
1152 sense_valid
= scsi_sense_valid(&sshdr
);
1154 } while (retries
< 3 &&
1155 (!scsi_status_is_good(the_result
) ||
1156 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1157 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1159 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1160 /* no sense, TUR either succeeded or failed
1161 * with a status error */
1162 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1163 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1164 sd_print_result(sdkp
, the_result
);
1170 * The device does not want the automatic start to be issued.
1172 if (sdkp
->device
->no_start_on_add
) {
1177 * If manual intervention is required, or this is an
1178 * absent USB storage device, a spinup is meaningless.
1181 sshdr
.sense_key
== NOT_READY
&&
1182 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1183 break; /* manual intervention required */
1186 * Issue command to spin up drive when not ready
1188 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1190 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1191 cmd
[0] = START_STOP
;
1192 cmd
[1] = 1; /* Return immediately */
1193 memset((void *) &cmd
[2], 0, 8);
1194 cmd
[4] = 1; /* Start spin cycle */
1195 if (sdkp
->device
->start_stop_pwr_cond
)
1197 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1199 SD_TIMEOUT
, SD_MAX_RETRIES
);
1200 spintime_expire
= jiffies
+ 100 * HZ
;
1203 /* Wait 1 second for next try */
1208 * Wait for USB flash devices with slow firmware.
1209 * Yes, this sense key/ASC combination shouldn't
1210 * occur here. It's characteristic of these devices.
1212 } else if (sense_valid
&&
1213 sshdr
.sense_key
== UNIT_ATTENTION
&&
1214 sshdr
.asc
== 0x28) {
1216 spintime_expire
= jiffies
+ 5 * HZ
;
1219 /* Wait 1 second for next try */
1222 /* we don't understand the sense code, so it's
1223 * probably pointless to loop */
1225 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1226 sd_print_sense_hdr(sdkp
, &sshdr
);
1231 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1234 if (scsi_status_is_good(the_result
))
1237 printk("not responding...\n");
1243 * Determine whether disk supports Data Integrity Field.
1245 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1247 struct scsi_device
*sdp
= sdkp
->device
;
1250 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1253 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1256 case SD_DIF_TYPE0_PROTECTION
:
1257 sdkp
->protection_type
= 0;
1260 case SD_DIF_TYPE1_PROTECTION
:
1261 case SD_DIF_TYPE3_PROTECTION
:
1262 sdkp
->protection_type
= type
;
1265 case SD_DIF_TYPE2_PROTECTION
:
1266 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1267 "protection which is currently unsupported. " \
1268 "Disabling disk!\n");
1272 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1273 "protection type %d. Disabling disk!\n", type
);
1280 sdkp
->protection_type
= 0;
1285 * read disk capacity
1288 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1290 unsigned char cmd
[16];
1291 int the_result
, retries
;
1292 int sector_size
= 0;
1293 /* Force READ CAPACITY(16) when PROTECT=1 */
1294 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1295 struct scsi_sense_hdr sshdr
;
1296 int sense_valid
= 0;
1297 struct scsi_device
*sdp
= sdkp
->device
;
1303 memset((void *) cmd
, 0, 16);
1304 cmd
[0] = SERVICE_ACTION_IN
;
1305 cmd
[1] = SAI_READ_CAPACITY_16
;
1307 memset((void *) buffer
, 0, 13);
1309 cmd
[0] = READ_CAPACITY
;
1310 memset((void *) &cmd
[1], 0, 9);
1311 memset((void *) buffer
, 0, 8);
1314 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1315 buffer
, longrc
? 13 : 8, &sshdr
,
1316 SD_TIMEOUT
, SD_MAX_RETRIES
);
1318 if (media_not_present(sdkp
, &sshdr
))
1322 sense_valid
= scsi_sense_valid(&sshdr
);
1325 } while (the_result
&& retries
);
1327 if (the_result
&& !longrc
) {
1328 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1329 sd_print_result(sdkp
, the_result
);
1330 if (driver_byte(the_result
) & DRIVER_SENSE
)
1331 sd_print_sense_hdr(sdkp
, &sshdr
);
1333 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1335 /* Set dirty bit for removable devices if not ready -
1336 * sometimes drives will not report this properly. */
1337 if (sdp
->removable
&&
1338 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1341 /* Either no media are present but the drive didn't tell us,
1342 or they are present but the read capacity command fails */
1343 /* sdkp->media_present = 0; -- not always correct */
1344 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1347 } else if (the_result
&& longrc
) {
1348 /* READ CAPACITY(16) has been failed */
1349 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1350 sd_print_result(sdkp
, the_result
);
1351 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1353 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1358 sector_size
= (buffer
[4] << 24) |
1359 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1360 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1361 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1362 if(sizeof(sdkp
->capacity
) > 4) {
1363 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1364 "Trying to use READ CAPACITY(16).\n");
1368 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1369 "a kernel compiled with support for large "
1370 "block devices.\n");
1374 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1379 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1380 ((u64
)buffer
[1] << 48) |
1381 ((u64
)buffer
[2] << 40) |
1382 ((u64
)buffer
[3] << 32) |
1383 ((sector_t
)buffer
[4] << 24) |
1384 ((sector_t
)buffer
[5] << 16) |
1385 ((sector_t
)buffer
[6] << 8) |
1386 (sector_t
)buffer
[7]);
1388 sector_size
= (buffer
[8] << 24) |
1389 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1391 sd_read_protection_type(sdkp
, buffer
);
1394 /* Some devices return the total number of sectors, not the
1395 * highest sector number. Make the necessary adjustment. */
1396 if (sdp
->fix_capacity
) {
1399 /* Some devices have version which report the correct sizes
1400 * and others which do not. We guess size according to a heuristic
1401 * and err on the side of lowering the capacity. */
1403 if (sdp
->guess_capacity
)
1404 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1409 if (sector_size
== 0) {
1411 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1415 if (sector_size
!= 512 &&
1416 sector_size
!= 1024 &&
1417 sector_size
!= 2048 &&
1418 sector_size
!= 4096 &&
1419 sector_size
!= 256) {
1420 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1423 * The user might want to re-format the drive with
1424 * a supported sectorsize. Once this happens, it
1425 * would be relatively trivial to set the thing up.
1426 * For this reason, we leave the thing in the table.
1430 * set a bogus sector size so the normal read/write
1431 * logic in the block layer will eventually refuse any
1432 * request on this device without tripping over power
1433 * of two sector size assumptions
1437 blk_queue_hardsect_size(sdp
->request_queue
, sector_size
);
1440 char cap_str_2
[10], cap_str_10
[10];
1441 u64 sz
= sdkp
->capacity
<< ffz(~sector_size
);
1443 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1445 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1446 sizeof(cap_str_10
));
1448 sd_printk(KERN_NOTICE
, sdkp
,
1449 "%llu %d-byte hardware sectors: (%s/%s)\n",
1450 (unsigned long long)sdkp
->capacity
,
1451 sector_size
, cap_str_10
, cap_str_2
);
1454 /* Rescale capacity to 512-byte units */
1455 if (sector_size
== 4096)
1456 sdkp
->capacity
<<= 3;
1457 else if (sector_size
== 2048)
1458 sdkp
->capacity
<<= 2;
1459 else if (sector_size
== 1024)
1460 sdkp
->capacity
<<= 1;
1461 else if (sector_size
== 256)
1462 sdkp
->capacity
>>= 1;
1464 sdkp
->device
->sector_size
= sector_size
;
1467 /* called with buffer of length 512 */
1469 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1470 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1471 struct scsi_sense_hdr
*sshdr
)
1473 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1474 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1479 * read write protect setting, if possible - called only in sd_revalidate_disk()
1480 * called with buffer of length SD_BUF_SIZE
1483 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1486 struct scsi_device
*sdp
= sdkp
->device
;
1487 struct scsi_mode_data data
;
1489 set_disk_ro(sdkp
->disk
, 0);
1490 if (sdp
->skip_ms_page_3f
) {
1491 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1495 if (sdp
->use_192_bytes_for_3f
) {
1496 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1499 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1500 * We have to start carefully: some devices hang if we ask
1501 * for more than is available.
1503 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1506 * Second attempt: ask for page 0 When only page 0 is
1507 * implemented, a request for page 3F may return Sense Key
1508 * 5: Illegal Request, Sense Code 24: Invalid field in
1511 if (!scsi_status_is_good(res
))
1512 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1515 * Third attempt: ask 255 bytes, as we did earlier.
1517 if (!scsi_status_is_good(res
))
1518 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1522 if (!scsi_status_is_good(res
)) {
1523 sd_printk(KERN_WARNING
, sdkp
,
1524 "Test WP failed, assume Write Enabled\n");
1526 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1527 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1528 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1529 sdkp
->write_prot
? "on" : "off");
1530 sd_printk(KERN_DEBUG
, sdkp
,
1531 "Mode Sense: %02x %02x %02x %02x\n",
1532 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1537 * sd_read_cache_type - called only from sd_revalidate_disk()
1538 * called with buffer of length SD_BUF_SIZE
1541 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1544 struct scsi_device
*sdp
= sdkp
->device
;
1548 struct scsi_mode_data data
;
1549 struct scsi_sense_hdr sshdr
;
1551 if (sdp
->skip_ms_page_8
)
1554 if (sdp
->type
== TYPE_RBC
) {
1562 /* cautiously ask */
1563 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1565 if (!scsi_status_is_good(res
))
1568 if (!data
.header_length
) {
1570 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1573 /* that went OK, now ask for the proper length */
1577 * We're only interested in the first three bytes, actually.
1578 * But the data cache page is defined for the first 20.
1585 /* Take headers and block descriptors into account */
1586 len
+= data
.header_length
+ data
.block_descriptor_length
;
1587 if (len
> SD_BUF_SIZE
)
1591 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1593 if (scsi_status_is_good(res
)) {
1594 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1596 if (offset
>= SD_BUF_SIZE
- 2) {
1597 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1601 if ((buffer
[offset
] & 0x3f) != modepage
) {
1602 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1606 if (modepage
== 8) {
1607 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1608 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1610 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1614 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1615 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1616 sd_printk(KERN_NOTICE
, sdkp
,
1617 "Uses READ/WRITE(6), disabling FUA\n");
1621 sd_printk(KERN_NOTICE
, sdkp
,
1622 "Write cache: %s, read cache: %s, %s\n",
1623 sdkp
->WCE
? "enabled" : "disabled",
1624 sdkp
->RCD
? "disabled" : "enabled",
1625 sdkp
->DPOFUA
? "supports DPO and FUA"
1626 : "doesn't support DPO or FUA");
1632 if (scsi_sense_valid(&sshdr
) &&
1633 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1634 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1635 /* Invalid field in CDB */
1636 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1638 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1641 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1648 * The ATO bit indicates whether the DIF application tag is available
1649 * for use by the operating system.
1651 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1654 struct scsi_device
*sdp
= sdkp
->device
;
1655 struct scsi_mode_data data
;
1656 struct scsi_sense_hdr sshdr
;
1658 if (sdp
->type
!= TYPE_DISK
)
1661 if (sdkp
->protection_type
== 0)
1664 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1665 SD_MAX_RETRIES
, &data
, &sshdr
);
1667 if (!scsi_status_is_good(res
) || !data
.header_length
||
1669 sd_printk(KERN_WARNING
, sdkp
,
1670 "getting Control mode page failed, assume no ATO\n");
1672 if (scsi_sense_valid(&sshdr
))
1673 sd_print_sense_hdr(sdkp
, &sshdr
);
1678 offset
= data
.header_length
+ data
.block_descriptor_length
;
1680 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1681 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1685 if ((buffer
[offset
+ 5] & 0x80) == 0)
1694 * sd_revalidate_disk - called the first time a new disk is seen,
1695 * performs disk spin up, read_capacity, etc.
1696 * @disk: struct gendisk we care about
1698 static int sd_revalidate_disk(struct gendisk
*disk
)
1700 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1701 struct scsi_device
*sdp
= sdkp
->device
;
1702 unsigned char *buffer
;
1705 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1706 "sd_revalidate_disk\n"));
1709 * If the device is offline, don't try and read capacity or any
1710 * of the other niceties.
1712 if (!scsi_device_online(sdp
))
1715 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1717 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1718 "allocation failure.\n");
1722 /* defaults, until the device tells us otherwise */
1723 sdp
->sector_size
= 512;
1725 sdkp
->media_present
= 1;
1726 sdkp
->write_prot
= 0;
1731 sd_spinup_disk(sdkp
);
1734 * Without media there is no reason to ask; moreover, some devices
1735 * react badly if we do.
1737 if (sdkp
->media_present
) {
1738 sd_read_capacity(sdkp
, buffer
);
1739 sd_read_write_protect_flag(sdkp
, buffer
);
1740 sd_read_cache_type(sdkp
, buffer
);
1741 sd_read_app_tag_own(sdkp
, buffer
);
1745 * We now have all cache related info, determine how we deal
1746 * with ordered requests. Note that as the current SCSI
1747 * dispatch function can alter request order, we cannot use
1748 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1751 ordered
= sdkp
->DPOFUA
1752 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1754 ordered
= QUEUE_ORDERED_DRAIN
;
1756 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1758 set_capacity(disk
, sdkp
->capacity
);
1766 * sd_format_disk_name - format disk name
1767 * @prefix: name prefix - ie. "sd" for SCSI disks
1768 * @index: index of the disk to format name for
1769 * @buf: output buffer
1770 * @buflen: length of the output buffer
1772 * SCSI disk names starts at sda. The 26th device is sdz and the
1773 * 27th is sdaa. The last one for two lettered suffix is sdzz
1774 * which is followed by sdaaa.
1776 * This is basically 26 base counting with one extra 'nil' entry
1777 * at the beggining from the second digit on and can be
1778 * determined using similar method as 26 base conversion with the
1779 * index shifted -1 after each digit is computed.
1785 * 0 on success, -errno on failure.
1787 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
1789 const int base
= 'z' - 'a' + 1;
1790 char *begin
= buf
+ strlen(prefix
);
1791 char *end
= buf
+ buflen
;
1801 *--p
= 'a' + (index
% unit
);
1802 index
= (index
/ unit
) - 1;
1803 } while (index
>= 0);
1805 memmove(begin
, p
, end
- p
);
1806 memcpy(buf
, prefix
, strlen(prefix
));
1812 * sd_probe - called during driver initialization and whenever a
1813 * new scsi device is attached to the system. It is called once
1814 * for each scsi device (not just disks) present.
1815 * @dev: pointer to device object
1817 * Returns 0 if successful (or not interested in this scsi device
1818 * (e.g. scanner)); 1 when there is an error.
1820 * Note: this function is invoked from the scsi mid-level.
1821 * This function sets up the mapping between a given
1822 * <host,channel,id,lun> (found in sdp) and new device name
1823 * (e.g. /dev/sda). More precisely it is the block device major
1824 * and minor number that is chosen here.
1826 * Assume sd_attach is not re-entrant (for time being)
1827 * Also think about sd_attach() and sd_remove() running coincidentally.
1829 static int sd_probe(struct device
*dev
)
1831 struct scsi_device
*sdp
= to_scsi_device(dev
);
1832 struct scsi_disk
*sdkp
;
1838 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1841 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1845 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1849 gd
= alloc_disk(SD_MINORS
);
1854 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1857 error
= ida_get_new(&sd_index_ida
, &index
);
1858 } while (error
== -EAGAIN
);
1863 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
1865 goto out_free_index
;
1868 sdkp
->driver
= &sd_template
;
1870 sdkp
->index
= index
;
1872 sdkp
->previous_state
= 1;
1874 if (!sdp
->request_queue
->rq_timeout
) {
1875 if (sdp
->type
!= TYPE_MOD
)
1876 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
1878 blk_queue_rq_timeout(sdp
->request_queue
,
1882 device_initialize(&sdkp
->dev
);
1883 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1884 sdkp
->dev
.class = &sd_disk_class
;
1885 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1887 if (device_add(&sdkp
->dev
))
1888 goto out_free_index
;
1890 get_device(&sdp
->sdev_gendev
);
1892 if (index
< SD_MAX_DISKS
) {
1893 gd
->major
= sd_major((index
& 0xf0) >> 4);
1894 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1895 gd
->minors
= SD_MINORS
;
1897 gd
->fops
= &sd_fops
;
1898 gd
->private_data
= &sdkp
->driver
;
1899 gd
->queue
= sdkp
->device
->request_queue
;
1901 sd_revalidate_disk(gd
);
1903 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1905 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1906 gd
->flags
= GENHD_FL_EXT_DEVT
| GENHD_FL_DRIVERFS
;
1908 gd
->flags
|= GENHD_FL_REMOVABLE
;
1910 dev_set_drvdata(dev
, sdkp
);
1912 sd_dif_config_host(sdkp
);
1914 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1915 sdp
->removable
? "removable " : "");
1920 ida_remove(&sd_index_ida
, index
);
1930 * sd_remove - called whenever a scsi disk (previously recognized by
1931 * sd_probe) is detached from the system. It is called (potentially
1932 * multiple times) during sd module unload.
1933 * @sdp: pointer to mid level scsi device object
1935 * Note: this function is invoked from the scsi mid-level.
1936 * This function potentially frees up a device name (e.g. /dev/sdc)
1937 * that could be re-used by a subsequent sd_probe().
1938 * This function is not called when the built-in sd driver is "exit-ed".
1940 static int sd_remove(struct device
*dev
)
1942 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1944 device_del(&sdkp
->dev
);
1945 del_gendisk(sdkp
->disk
);
1948 mutex_lock(&sd_ref_mutex
);
1949 dev_set_drvdata(dev
, NULL
);
1950 put_device(&sdkp
->dev
);
1951 mutex_unlock(&sd_ref_mutex
);
1957 * scsi_disk_release - Called to free the scsi_disk structure
1958 * @dev: pointer to embedded class device
1960 * sd_ref_mutex must be held entering this routine. Because it is
1961 * called on last put, you should always use the scsi_disk_get()
1962 * scsi_disk_put() helpers which manipulate the semaphore directly
1963 * and never do a direct put_device.
1965 static void scsi_disk_release(struct device
*dev
)
1967 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1968 struct gendisk
*disk
= sdkp
->disk
;
1970 ida_remove(&sd_index_ida
, sdkp
->index
);
1972 disk
->private_data
= NULL
;
1974 put_device(&sdkp
->device
->sdev_gendev
);
1979 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1981 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1982 struct scsi_sense_hdr sshdr
;
1983 struct scsi_device
*sdp
= sdkp
->device
;
1987 cmd
[4] |= 1; /* START */
1989 if (sdp
->start_stop_pwr_cond
)
1990 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1992 if (!scsi_device_online(sdp
))
1995 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1996 SD_TIMEOUT
, SD_MAX_RETRIES
);
1998 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1999 sd_print_result(sdkp
, res
);
2000 if (driver_byte(res
) & DRIVER_SENSE
)
2001 sd_print_sense_hdr(sdkp
, &sshdr
);
2008 * Send a SYNCHRONIZE CACHE instruction down to the device through
2009 * the normal SCSI command structure. Wait for the command to
2012 static void sd_shutdown(struct device
*dev
)
2014 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2017 return; /* this can happen */
2020 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2021 sd_sync_cache(sdkp
);
2024 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2025 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2026 sd_start_stop_device(sdkp
, 0);
2029 scsi_disk_put(sdkp
);
2032 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2034 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2038 return 0; /* this can happen */
2041 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2042 ret
= sd_sync_cache(sdkp
);
2047 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2048 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2049 ret
= sd_start_stop_device(sdkp
, 0);
2053 scsi_disk_put(sdkp
);
2057 static int sd_resume(struct device
*dev
)
2059 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2062 if (!sdkp
->device
->manage_start_stop
)
2065 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2066 ret
= sd_start_stop_device(sdkp
, 1);
2069 scsi_disk_put(sdkp
);
2074 * init_sd - entry point for this driver (both when built in or when
2077 * Note: this function registers this driver with the scsi mid-level.
2079 static int __init
init_sd(void)
2081 int majors
= 0, i
, err
;
2083 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2085 for (i
= 0; i
< SD_MAJORS
; i
++)
2086 if (register_blkdev(sd_major(i
), "sd") == 0)
2092 err
= class_register(&sd_disk_class
);
2096 err
= scsi_register_driver(&sd_template
.gendrv
);
2103 class_unregister(&sd_disk_class
);
2105 for (i
= 0; i
< SD_MAJORS
; i
++)
2106 unregister_blkdev(sd_major(i
), "sd");
2111 * exit_sd - exit point for this driver (when it is a module).
2113 * Note: this function unregisters this driver from the scsi mid-level.
2115 static void __exit
exit_sd(void)
2119 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2121 scsi_unregister_driver(&sd_template
.gendrv
);
2122 class_unregister(&sd_disk_class
);
2124 for (i
= 0; i
< SD_MAJORS
; i
++)
2125 unregister_blkdev(sd_major(i
), "sd");
2128 module_init(init_sd
);
2129 module_exit(exit_sd
);
2131 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2132 struct scsi_sense_hdr
*sshdr
)
2134 sd_printk(KERN_INFO
, sdkp
, "");
2135 scsi_show_sense_hdr(sshdr
);
2136 sd_printk(KERN_INFO
, sdkp
, "");
2137 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2140 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2142 sd_printk(KERN_INFO
, sdkp
, "");
2143 scsi_show_result(result
);