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 <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static void sd_config_discard(struct scsi_disk
*, unsigned int);
101 static int sd_revalidate_disk(struct gendisk
*);
102 static void sd_unlock_native_capacity(struct gendisk
*disk
);
103 static int sd_probe(struct device
*);
104 static int sd_remove(struct device
*);
105 static void sd_shutdown(struct device
*);
106 static int sd_suspend(struct device
*, pm_message_t state
);
107 static int sd_resume(struct device
*);
108 static void sd_rescan(struct device
*);
109 static int sd_done(struct scsi_cmnd
*);
110 static int sd_eh_action(struct scsi_cmnd
*, unsigned char *, int, int);
111 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
112 static void scsi_disk_release(struct device
*cdev
);
113 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
114 static void sd_print_result(struct scsi_disk
*, int);
116 static DEFINE_SPINLOCK(sd_index_lock
);
117 static DEFINE_IDA(sd_index_ida
);
119 /* This semaphore is used to mediate the 0->1 reference get in the
120 * face of object destruction (i.e. we can't allow a get on an
121 * object after last put) */
122 static DEFINE_MUTEX(sd_ref_mutex
);
124 static struct kmem_cache
*sd_cdb_cache
;
125 static mempool_t
*sd_cdb_pool
;
127 static const char *sd_cache_types
[] = {
128 "write through", "none", "write back",
129 "write back, no read (daft)"
133 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
134 const char *buf
, size_t count
)
136 int i
, ct
= -1, rcd
, wce
, sp
;
137 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
138 struct scsi_device
*sdp
= sdkp
->device
;
141 struct scsi_mode_data data
;
142 struct scsi_sense_hdr sshdr
;
145 if (sdp
->type
!= TYPE_DISK
)
146 /* no cache control on RBC devices; theoretically they
147 * can do it, but there's probably so many exceptions
148 * it's not worth the risk */
151 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
152 len
= strlen(sd_cache_types
[i
]);
153 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
161 rcd
= ct
& 0x01 ? 1 : 0;
162 wce
= ct
& 0x02 ? 1 : 0;
163 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
164 SD_MAX_RETRIES
, &data
, NULL
))
166 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
167 data
.block_descriptor_length
);
168 buffer_data
= buffer
+ data
.header_length
+
169 data
.block_descriptor_length
;
170 buffer_data
[2] &= ~0x05;
171 buffer_data
[2] |= wce
<< 2 | rcd
;
172 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
174 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
175 SD_MAX_RETRIES
, &data
, &sshdr
)) {
176 if (scsi_sense_valid(&sshdr
))
177 sd_print_sense_hdr(sdkp
, &sshdr
);
180 revalidate_disk(sdkp
->disk
);
185 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
186 const char *buf
, size_t count
)
188 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
189 struct scsi_device
*sdp
= sdkp
->device
;
191 if (!capable(CAP_SYS_ADMIN
))
194 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
200 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
201 const char *buf
, size_t count
)
203 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
204 struct scsi_device
*sdp
= sdkp
->device
;
206 if (!capable(CAP_SYS_ADMIN
))
209 if (sdp
->type
!= TYPE_DISK
)
212 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
218 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
221 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
222 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
224 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
228 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
230 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
232 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
236 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
239 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
240 struct scsi_device
*sdp
= sdkp
->device
;
242 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
246 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
249 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
251 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
255 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
258 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
260 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
264 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
267 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
268 struct scsi_device
*sdp
= sdkp
->device
;
269 unsigned int dif
, dix
;
271 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
272 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
274 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
280 return snprintf(buf
, 20, "none\n");
282 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
286 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
289 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
291 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
295 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
298 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
300 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
303 static const char *lbp_mode
[] = {
304 [SD_LBP_FULL
] = "full",
305 [SD_LBP_UNMAP
] = "unmap",
306 [SD_LBP_WS16
] = "writesame_16",
307 [SD_LBP_WS10
] = "writesame_10",
308 [SD_LBP_ZERO
] = "writesame_zero",
309 [SD_LBP_DISABLE
] = "disabled",
313 sd_show_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
316 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
318 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
322 sd_store_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
323 const char *buf
, size_t count
)
325 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
326 struct scsi_device
*sdp
= sdkp
->device
;
328 if (!capable(CAP_SYS_ADMIN
))
331 if (sdp
->type
!= TYPE_DISK
)
334 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
335 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
336 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
337 sd_config_discard(sdkp
, SD_LBP_WS16
);
338 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
339 sd_config_discard(sdkp
, SD_LBP_WS10
);
340 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
341 sd_config_discard(sdkp
, SD_LBP_ZERO
);
342 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
343 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
351 sd_show_max_medium_access_timeouts(struct device
*dev
,
352 struct device_attribute
*attr
, char *buf
)
354 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
356 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
360 sd_store_max_medium_access_timeouts(struct device
*dev
,
361 struct device_attribute
*attr
,
362 const char *buf
, size_t count
)
364 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
367 if (!capable(CAP_SYS_ADMIN
))
370 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
372 return err
? err
: count
;
375 static struct device_attribute sd_disk_attrs
[] = {
376 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
377 sd_store_cache_type
),
378 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
379 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
380 sd_store_allow_restart
),
381 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
382 sd_store_manage_start_stop
),
383 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
384 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
385 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
386 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
387 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
388 sd_store_provisioning_mode
),
389 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
390 sd_show_max_medium_access_timeouts
,
391 sd_store_max_medium_access_timeouts
),
395 static struct class sd_disk_class
= {
397 .owner
= THIS_MODULE
,
398 .dev_release
= scsi_disk_release
,
399 .dev_attrs
= sd_disk_attrs
,
402 static struct scsi_driver sd_template
= {
403 .owner
= THIS_MODULE
,
408 .suspend
= sd_suspend
,
410 .shutdown
= sd_shutdown
,
414 .eh_action
= sd_eh_action
,
418 * Device no to disk mapping:
420 * major disc2 disc p1
421 * |............|.............|....|....| <- dev_t
424 * Inside a major, we have 16k disks, however mapped non-
425 * contiguously. The first 16 disks are for major0, the next
426 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * As we stay compatible with our numbering scheme, we can reuse
429 * the well-know SCSI majors 8, 65--71, 136--143.
431 static int sd_major(int major_idx
)
435 return SCSI_DISK0_MAJOR
;
437 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
439 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
442 return 0; /* shut up gcc */
446 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
448 struct scsi_disk
*sdkp
= NULL
;
450 if (disk
->private_data
) {
451 sdkp
= scsi_disk(disk
);
452 if (scsi_device_get(sdkp
->device
) == 0)
453 get_device(&sdkp
->dev
);
460 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
462 struct scsi_disk
*sdkp
;
464 mutex_lock(&sd_ref_mutex
);
465 sdkp
= __scsi_disk_get(disk
);
466 mutex_unlock(&sd_ref_mutex
);
470 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
472 struct scsi_disk
*sdkp
;
474 mutex_lock(&sd_ref_mutex
);
475 sdkp
= dev_get_drvdata(dev
);
477 sdkp
= __scsi_disk_get(sdkp
->disk
);
478 mutex_unlock(&sd_ref_mutex
);
482 static void scsi_disk_put(struct scsi_disk
*sdkp
)
484 struct scsi_device
*sdev
= sdkp
->device
;
486 mutex_lock(&sd_ref_mutex
);
487 put_device(&sdkp
->dev
);
488 scsi_device_put(sdev
);
489 mutex_unlock(&sd_ref_mutex
);
492 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
494 unsigned int prot_op
= SCSI_PROT_NORMAL
;
495 unsigned int dix
= scsi_prot_sg_count(scmd
);
497 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
499 prot_op
= SCSI_PROT_READ_PASS
;
500 else if (dif
&& !dix
)
501 prot_op
= SCSI_PROT_READ_STRIP
;
502 else if (!dif
&& dix
)
503 prot_op
= SCSI_PROT_READ_INSERT
;
506 prot_op
= SCSI_PROT_WRITE_PASS
;
507 else if (dif
&& !dix
)
508 prot_op
= SCSI_PROT_WRITE_INSERT
;
509 else if (!dif
&& dix
)
510 prot_op
= SCSI_PROT_WRITE_STRIP
;
513 scsi_set_prot_op(scmd
, prot_op
);
514 scsi_set_prot_type(scmd
, dif
);
517 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
519 struct request_queue
*q
= sdkp
->disk
->queue
;
520 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
521 unsigned int max_blocks
= 0;
523 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
524 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
526 q
->limits
.discard_granularity
=
527 max(sdkp
->physical_block_size
,
528 sdkp
->unmap_granularity
* logical_block_size
);
530 sdkp
->provisioning_mode
= mode
;
535 q
->limits
.max_discard_sectors
= 0;
536 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
540 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
, 0xffffffff);
544 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, 0xffffffff);
548 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, (u32
)0xffff);
552 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, (u32
)0xffff);
553 q
->limits
.discard_zeroes_data
= 1;
557 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
558 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
562 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
563 * @sdp: scsi device to operate one
564 * @rq: Request to prepare
566 * Will issue either UNMAP or WRITE SAME(16) depending on preference
567 * indicated by target device.
569 static int scsi_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
571 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
572 struct bio
*bio
= rq
->bio
;
573 sector_t sector
= bio
->bi_sector
;
574 unsigned int nr_sectors
= bio_sectors(bio
);
580 if (sdkp
->device
->sector_size
== 4096) {
585 rq
->timeout
= SD_TIMEOUT
;
587 memset(rq
->cmd
, 0, rq
->cmd_len
);
589 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
591 return BLKPREP_DEFER
;
593 switch (sdkp
->provisioning_mode
) {
595 buf
= page_address(page
);
601 put_unaligned_be16(6 + 16, &buf
[0]);
602 put_unaligned_be16(16, &buf
[2]);
603 put_unaligned_be64(sector
, &buf
[8]);
604 put_unaligned_be32(nr_sectors
, &buf
[16]);
611 rq
->cmd
[0] = WRITE_SAME_16
;
612 rq
->cmd
[1] = 0x8; /* UNMAP */
613 put_unaligned_be64(sector
, &rq
->cmd
[2]);
614 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
616 len
= sdkp
->device
->sector_size
;
622 rq
->cmd
[0] = WRITE_SAME
;
623 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
624 rq
->cmd
[1] = 0x8; /* UNMAP */
625 put_unaligned_be32(sector
, &rq
->cmd
[2]);
626 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
628 len
= sdkp
->device
->sector_size
;
636 blk_add_request_payload(rq
, page
, len
);
637 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
638 rq
->buffer
= page_address(page
);
641 if (ret
!= BLKPREP_OK
) {
648 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
650 rq
->timeout
= SD_FLUSH_TIMEOUT
;
651 rq
->retries
= SD_MAX_RETRIES
;
652 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
655 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
658 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
660 if (rq
->cmd_flags
& REQ_DISCARD
) {
661 free_page((unsigned long)rq
->buffer
);
667 * sd_prep_fn - build a scsi (read or write) command from
668 * information in the request structure.
669 * @SCpnt: pointer to mid-level's per scsi command structure that
670 * contains request and into which the scsi command is written
672 * Returns 1 if successful and 0 if error (or cannot be done now).
674 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
676 struct scsi_cmnd
*SCpnt
;
677 struct scsi_device
*sdp
= q
->queuedata
;
678 struct gendisk
*disk
= rq
->rq_disk
;
679 struct scsi_disk
*sdkp
;
680 sector_t block
= blk_rq_pos(rq
);
682 unsigned int this_count
= blk_rq_sectors(rq
);
684 unsigned char protect
;
687 * Discard request come in as REQ_TYPE_FS but we turn them into
688 * block PC requests to make life easier.
690 if (rq
->cmd_flags
& REQ_DISCARD
) {
691 ret
= scsi_setup_discard_cmnd(sdp
, rq
);
693 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
694 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
696 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
697 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
699 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
703 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
704 if (ret
!= BLKPREP_OK
)
707 sdkp
= scsi_disk(disk
);
709 /* from here on until we're complete, any goto out
710 * is used for a killable error condition */
713 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
714 "sd_prep_fn: block=%llu, "
716 (unsigned long long)block
,
719 if (!sdp
|| !scsi_device_online(sdp
) ||
720 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
721 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
722 "Finishing %u sectors\n",
723 blk_rq_sectors(rq
)));
724 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
725 "Retry with 0x%p\n", SCpnt
));
731 * quietly refuse to do anything to a changed disc until
732 * the changed bit has been reset
734 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
739 * Some SD card readers can't handle multi-sector accesses which touch
740 * the last one or two hardware sectors. Split accesses as needed.
742 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
743 (sdp
->sector_size
/ 512);
745 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
746 if (block
< threshold
) {
747 /* Access up to the threshold but not beyond */
748 this_count
= threshold
- block
;
750 /* Access only a single hardware sector */
751 this_count
= sdp
->sector_size
/ 512;
755 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
756 (unsigned long long)block
));
759 * If we have a 1K hardware sectorsize, prevent access to single
760 * 512 byte sectors. In theory we could handle this - in fact
761 * the scsi cdrom driver must be able to handle this because
762 * we typically use 1K blocksizes, and cdroms typically have
763 * 2K hardware sectorsizes. Of course, things are simpler
764 * with the cdrom, since it is read-only. For performance
765 * reasons, the filesystems should be able to handle this
766 * and not force the scsi disk driver to use bounce buffers
769 if (sdp
->sector_size
== 1024) {
770 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
771 scmd_printk(KERN_ERR
, SCpnt
,
772 "Bad block number requested\n");
776 this_count
= this_count
>> 1;
779 if (sdp
->sector_size
== 2048) {
780 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
781 scmd_printk(KERN_ERR
, SCpnt
,
782 "Bad block number requested\n");
786 this_count
= this_count
>> 2;
789 if (sdp
->sector_size
== 4096) {
790 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
791 scmd_printk(KERN_ERR
, SCpnt
,
792 "Bad block number requested\n");
796 this_count
= this_count
>> 3;
799 if (rq_data_dir(rq
) == WRITE
) {
800 if (!sdp
->writeable
) {
803 SCpnt
->cmnd
[0] = WRITE_6
;
804 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
806 if (blk_integrity_rq(rq
) &&
807 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
810 } else if (rq_data_dir(rq
) == READ
) {
811 SCpnt
->cmnd
[0] = READ_6
;
812 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
814 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
818 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
819 "%s %d/%u 512 byte blocks.\n",
820 (rq_data_dir(rq
) == WRITE
) ?
821 "writing" : "reading", this_count
,
822 blk_rq_sectors(rq
)));
824 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
825 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
831 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
832 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
834 if (unlikely(SCpnt
->cmnd
== NULL
)) {
839 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
840 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
841 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
842 SCpnt
->cmnd
[7] = 0x18;
843 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
844 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
847 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
848 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
849 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
850 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
851 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
852 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
853 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
854 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
856 /* Expected Indirect LBA */
857 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
858 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
859 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
860 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
862 /* Transfer length */
863 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
864 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
865 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
866 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
867 } else if (block
> 0xffffffff) {
868 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
869 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
870 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
871 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
872 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
873 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
874 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
875 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
876 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
877 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
878 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
879 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
880 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
881 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
882 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
883 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
884 scsi_device_protection(SCpnt
->device
) ||
885 SCpnt
->device
->use_10_for_rw
) {
886 if (this_count
> 0xffff)
889 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
890 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
891 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
892 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
893 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
894 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
895 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
896 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
897 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
899 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
901 * This happens only if this drive failed
902 * 10byte rw command with ILLEGAL_REQUEST
903 * during operation and thus turned off
906 scmd_printk(KERN_ERR
, SCpnt
,
907 "FUA write on READ/WRITE(6) drive\n");
911 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
912 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
913 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
914 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
917 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
919 /* If DIF or DIX is enabled, tell HBA how to handle request */
920 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
921 sd_prot_op(SCpnt
, host_dif
);
924 * We shouldn't disconnect in the middle of a sector, so with a dumb
925 * host adapter, it's safe to assume that we can at least transfer
926 * this many bytes between each connect / disconnect.
928 SCpnt
->transfersize
= sdp
->sector_size
;
929 SCpnt
->underflow
= this_count
<< 9;
930 SCpnt
->allowed
= SD_MAX_RETRIES
;
933 * This indicates that the command is ready from our end to be
938 return scsi_prep_return(q
, rq
, ret
);
942 * sd_open - open a scsi disk device
943 * @inode: only i_rdev member may be used
944 * @filp: only f_mode and f_flags may be used
946 * Returns 0 if successful. Returns a negated errno value in case
949 * Note: This can be called from a user context (e.g. fsck(1) )
950 * or from within the kernel (e.g. as a result of a mount(1) ).
951 * In the latter case @inode and @filp carry an abridged amount
952 * of information as noted above.
954 * Locking: called with bdev->bd_mutex held.
956 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
958 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
959 struct scsi_device
*sdev
;
965 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
969 retval
= scsi_autopm_get_device(sdev
);
974 * If the device is in error recovery, wait until it is done.
975 * If the device is offline, then disallow any access to it.
978 if (!scsi_block_when_processing_errors(sdev
))
981 if (sdev
->removable
|| sdkp
->write_prot
)
982 check_disk_change(bdev
);
985 * If the drive is empty, just let the open fail.
988 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
992 * If the device has the write protect tab set, have the open fail
993 * if the user expects to be able to write to the thing.
996 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1000 * It is possible that the disk changing stuff resulted in
1001 * the device being taken offline. If this is the case,
1002 * report this to the user, and don't pretend that the
1003 * open actually succeeded.
1006 if (!scsi_device_online(sdev
))
1009 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1010 if (scsi_block_when_processing_errors(sdev
))
1011 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1017 scsi_autopm_put_device(sdev
);
1019 scsi_disk_put(sdkp
);
1024 * sd_release - invoked when the (last) close(2) is called on this
1026 * @inode: only i_rdev member may be used
1027 * @filp: only f_mode and f_flags may be used
1031 * Note: may block (uninterruptible) if error recovery is underway
1034 * Locking: called with bdev->bd_mutex held.
1036 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
1038 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1039 struct scsi_device
*sdev
= sdkp
->device
;
1041 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1043 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1044 if (scsi_block_when_processing_errors(sdev
))
1045 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1049 * XXX and what if there are packets in flight and this close()
1050 * XXX is followed by a "rmmod sd_mod"?
1053 scsi_autopm_put_device(sdev
);
1054 scsi_disk_put(sdkp
);
1058 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1060 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1061 struct scsi_device
*sdp
= sdkp
->device
;
1062 struct Scsi_Host
*host
= sdp
->host
;
1065 /* default to most commonly used values */
1066 diskinfo
[0] = 0x40; /* 1 << 6 */
1067 diskinfo
[1] = 0x20; /* 1 << 5 */
1068 diskinfo
[2] = sdkp
->capacity
>> 11;
1070 /* override with calculated, extended default, or driver values */
1071 if (host
->hostt
->bios_param
)
1072 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1074 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1076 geo
->heads
= diskinfo
[0];
1077 geo
->sectors
= diskinfo
[1];
1078 geo
->cylinders
= diskinfo
[2];
1083 * sd_ioctl - process an ioctl
1084 * @inode: only i_rdev/i_bdev members may be used
1085 * @filp: only f_mode and f_flags may be used
1086 * @cmd: ioctl command number
1087 * @arg: this is third argument given to ioctl(2) system call.
1088 * Often contains a pointer.
1090 * Returns 0 if successful (some ioctls return positive numbers on
1091 * success as well). Returns a negated errno value in case of error.
1093 * Note: most ioctls are forward onto the block subsystem or further
1094 * down in the scsi subsystem.
1096 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1097 unsigned int cmd
, unsigned long arg
)
1099 struct gendisk
*disk
= bdev
->bd_disk
;
1100 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1101 struct scsi_device
*sdp
= sdkp
->device
;
1102 void __user
*p
= (void __user
*)arg
;
1105 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1106 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1108 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1118 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1119 (mode
& FMODE_NDELAY
) != 0);
1120 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1124 * Send SCSI addressing ioctls directly to mid level, send other
1125 * ioctls to block level and then onto mid level if they can't be
1129 case SCSI_IOCTL_GET_IDLUN
:
1130 case SCSI_IOCTL_GET_BUS_NUMBER
:
1131 error
= scsi_ioctl(sdp
, cmd
, p
);
1134 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1135 if (error
!= -ENOTTY
)
1137 error
= scsi_ioctl(sdp
, cmd
, p
);
1144 static void set_media_not_present(struct scsi_disk
*sdkp
)
1146 if (sdkp
->media_present
)
1147 sdkp
->device
->changed
= 1;
1149 if (sdkp
->device
->removable
) {
1150 sdkp
->media_present
= 0;
1155 static int media_not_present(struct scsi_disk
*sdkp
,
1156 struct scsi_sense_hdr
*sshdr
)
1158 if (!scsi_sense_valid(sshdr
))
1161 /* not invoked for commands that could return deferred errors */
1162 switch (sshdr
->sense_key
) {
1163 case UNIT_ATTENTION
:
1165 /* medium not present */
1166 if (sshdr
->asc
== 0x3A) {
1167 set_media_not_present(sdkp
);
1175 * sd_check_events - check media events
1176 * @disk: kernel device descriptor
1177 * @clearing: disk events currently being cleared
1179 * Returns mask of DISK_EVENT_*.
1181 * Note: this function is invoked from the block subsystem.
1183 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1185 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1186 struct scsi_device
*sdp
= sdkp
->device
;
1187 struct scsi_sense_hdr
*sshdr
= NULL
;
1190 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1193 * If the device is offline, don't send any commands - just pretend as
1194 * if the command failed. If the device ever comes back online, we
1195 * can deal with it then. It is only because of unrecoverable errors
1196 * that we would ever take a device offline in the first place.
1198 if (!scsi_device_online(sdp
)) {
1199 set_media_not_present(sdkp
);
1204 * Using TEST_UNIT_READY enables differentiation between drive with
1205 * no cartridge loaded - NOT READY, drive with changed cartridge -
1206 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1208 * Drives that auto spin down. eg iomega jaz 1G, will be started
1209 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1210 * sd_revalidate() is called.
1214 if (scsi_block_when_processing_errors(sdp
)) {
1215 retval
= scsi_autopm_get_device(sdp
);
1219 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1220 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1222 scsi_autopm_put_device(sdp
);
1225 /* failed to execute TUR, assume media not present */
1226 if (host_byte(retval
)) {
1227 set_media_not_present(sdkp
);
1231 if (media_not_present(sdkp
, sshdr
))
1235 * For removable scsi disk we have to recognise the presence
1236 * of a disk in the drive.
1238 if (!sdkp
->media_present
)
1240 sdkp
->media_present
= 1;
1243 * sdp->changed is set under the following conditions:
1245 * Medium present state has changed in either direction.
1246 * Device has indicated UNIT_ATTENTION.
1249 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1254 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1257 struct scsi_device
*sdp
= sdkp
->device
;
1258 struct scsi_sense_hdr sshdr
;
1260 if (!scsi_device_online(sdp
))
1264 for (retries
= 3; retries
> 0; --retries
) {
1265 unsigned char cmd
[10] = { 0 };
1267 cmd
[0] = SYNCHRONIZE_CACHE
;
1269 * Leave the rest of the command zero to indicate
1272 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1273 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1279 sd_print_result(sdkp
, res
);
1280 if (driver_byte(res
) & DRIVER_SENSE
)
1281 sd_print_sense_hdr(sdkp
, &sshdr
);
1289 static void sd_rescan(struct device
*dev
)
1291 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1294 revalidate_disk(sdkp
->disk
);
1295 scsi_disk_put(sdkp
);
1300 #ifdef CONFIG_COMPAT
1302 * This gets directly called from VFS. When the ioctl
1303 * is not recognized we go back to the other translation paths.
1305 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1306 unsigned int cmd
, unsigned long arg
)
1308 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1311 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1316 * If we are in the middle of error recovery, don't let anyone
1317 * else try and use this device. Also, if error recovery fails, it
1318 * may try and take the device offline, in which case all further
1319 * access to the device is prohibited.
1321 if (!scsi_block_when_processing_errors(sdev
))
1324 if (sdev
->host
->hostt
->compat_ioctl
) {
1325 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1331 * Let the static ioctl translation table take care of it.
1333 return -ENOIOCTLCMD
;
1337 static const struct block_device_operations sd_fops
= {
1338 .owner
= THIS_MODULE
,
1340 .release
= sd_release
,
1342 .getgeo
= sd_getgeo
,
1343 #ifdef CONFIG_COMPAT
1344 .compat_ioctl
= sd_compat_ioctl
,
1346 .check_events
= sd_check_events
,
1347 .revalidate_disk
= sd_revalidate_disk
,
1348 .unlock_native_capacity
= sd_unlock_native_capacity
,
1352 * sd_eh_action - error handling callback
1353 * @scmd: sd-issued command that has failed
1354 * @eh_cmnd: The command that was sent during error handling
1355 * @eh_cmnd_len: Length of eh_cmnd in bytes
1356 * @eh_disp: The recovery disposition suggested by the midlayer
1358 * This function is called by the SCSI midlayer upon completion of
1359 * an error handling command (TEST UNIT READY, START STOP UNIT,
1360 * etc.) The command sent to the device by the error handler is
1361 * stored in eh_cmnd. The result of sending the eh command is
1362 * passed in eh_disp.
1364 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1365 int eh_cmnd_len
, int eh_disp
)
1367 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1369 if (!scsi_device_online(scmd
->device
) ||
1370 !scsi_medium_access_command(scmd
))
1374 * The device has timed out executing a medium access command.
1375 * However, the TEST UNIT READY command sent during error
1376 * handling completed successfully. Either the device is in the
1377 * process of recovering or has it suffered an internal failure
1378 * that prevents access to the storage medium.
1380 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1381 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1382 sdkp
->medium_access_timed_out
++;
1385 * If the device keeps failing read/write commands but TEST UNIT
1386 * READY always completes successfully we assume that medium
1387 * access is no longer possible and take the device offline.
1389 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1390 scmd_printk(KERN_ERR
, scmd
,
1391 "Medium access timeout failure. Offlining disk!\n");
1392 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1400 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1402 u64 start_lba
= blk_rq_pos(scmd
->request
);
1403 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1407 * resid is optional but mostly filled in. When it's unused,
1408 * its value is zero, so we assume the whole buffer transferred
1410 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1411 unsigned int good_bytes
;
1413 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1416 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1417 SCSI_SENSE_BUFFERSIZE
,
1422 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1425 if (scmd
->device
->sector_size
< 512) {
1426 /* only legitimate sector_size here is 256 */
1430 /* be careful ... don't want any overflows */
1431 u64 factor
= scmd
->device
->sector_size
/ 512;
1432 do_div(start_lba
, factor
);
1433 do_div(end_lba
, factor
);
1436 /* The bad lba was reported incorrectly, we have no idea where
1439 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1442 /* This computation should always be done in terms of
1443 * the resolution of the device's medium.
1445 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1446 return min(good_bytes
, transferred
);
1450 * sd_done - bottom half handler: called when the lower level
1451 * driver has completed (successfully or otherwise) a scsi command.
1452 * @SCpnt: mid-level's per command structure.
1454 * Note: potentially run from within an ISR. Must not block.
1456 static int sd_done(struct scsi_cmnd
*SCpnt
)
1458 int result
= SCpnt
->result
;
1459 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1460 struct scsi_sense_hdr sshdr
;
1461 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1462 int sense_valid
= 0;
1463 int sense_deferred
= 0;
1464 unsigned char op
= SCpnt
->cmnd
[0];
1466 if ((SCpnt
->request
->cmd_flags
& REQ_DISCARD
) && !result
)
1467 scsi_set_resid(SCpnt
, 0);
1470 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1472 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1474 #ifdef CONFIG_SCSI_LOGGING
1475 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1477 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1478 "sd_done: sb[respc,sk,asc,"
1479 "ascq]=%x,%x,%x,%x\n",
1480 sshdr
.response_code
,
1481 sshdr
.sense_key
, sshdr
.asc
,
1485 if (driver_byte(result
) != DRIVER_SENSE
&&
1486 (!sense_valid
|| sense_deferred
))
1489 sdkp
->medium_access_timed_out
= 0;
1491 switch (sshdr
.sense_key
) {
1492 case HARDWARE_ERROR
:
1494 good_bytes
= sd_completed_bytes(SCpnt
);
1496 case RECOVERED_ERROR
:
1497 good_bytes
= scsi_bufflen(SCpnt
);
1500 /* This indicates a false check condition, so ignore it. An
1501 * unknown amount of data was transferred so treat it as an
1504 scsi_print_sense("sd", SCpnt
);
1506 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1508 case ABORTED_COMMAND
:
1509 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1510 good_bytes
= sd_completed_bytes(SCpnt
);
1512 case ILLEGAL_REQUEST
:
1513 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1514 good_bytes
= sd_completed_bytes(SCpnt
);
1515 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1516 if ((sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1517 (op
== UNMAP
|| op
== WRITE_SAME_16
|| op
== WRITE_SAME
))
1518 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1524 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1525 sd_dif_complete(SCpnt
, good_bytes
);
1527 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1528 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1530 /* We have to print a failed command here as the
1531 * extended CDB gets freed before scsi_io_completion()
1535 scsi_print_command(SCpnt
);
1537 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1546 * spinup disk - called only in sd_revalidate_disk()
1549 sd_spinup_disk(struct scsi_disk
*sdkp
)
1551 unsigned char cmd
[10];
1552 unsigned long spintime_expire
= 0;
1553 int retries
, spintime
;
1554 unsigned int the_result
;
1555 struct scsi_sense_hdr sshdr
;
1556 int sense_valid
= 0;
1560 /* Spin up drives, as required. Only do this at boot time */
1561 /* Spinup needs to be done for module loads too. */
1566 cmd
[0] = TEST_UNIT_READY
;
1567 memset((void *) &cmd
[1], 0, 9);
1569 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1572 SD_MAX_RETRIES
, NULL
);
1575 * If the drive has indicated to us that it
1576 * doesn't have any media in it, don't bother
1577 * with any more polling.
1579 if (media_not_present(sdkp
, &sshdr
))
1583 sense_valid
= scsi_sense_valid(&sshdr
);
1585 } while (retries
< 3 &&
1586 (!scsi_status_is_good(the_result
) ||
1587 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1588 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1590 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1591 /* no sense, TUR either succeeded or failed
1592 * with a status error */
1593 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1594 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1595 sd_print_result(sdkp
, the_result
);
1601 * The device does not want the automatic start to be issued.
1603 if (sdkp
->device
->no_start_on_add
)
1606 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1607 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1608 break; /* manual intervention required */
1609 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1610 break; /* standby */
1611 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1612 break; /* unavailable */
1614 * Issue command to spin up drive when not ready
1617 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1618 cmd
[0] = START_STOP
;
1619 cmd
[1] = 1; /* Return immediately */
1620 memset((void *) &cmd
[2], 0, 8);
1621 cmd
[4] = 1; /* Start spin cycle */
1622 if (sdkp
->device
->start_stop_pwr_cond
)
1624 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1626 SD_TIMEOUT
, SD_MAX_RETRIES
,
1628 spintime_expire
= jiffies
+ 100 * HZ
;
1631 /* Wait 1 second for next try */
1636 * Wait for USB flash devices with slow firmware.
1637 * Yes, this sense key/ASC combination shouldn't
1638 * occur here. It's characteristic of these devices.
1640 } else if (sense_valid
&&
1641 sshdr
.sense_key
== UNIT_ATTENTION
&&
1642 sshdr
.asc
== 0x28) {
1644 spintime_expire
= jiffies
+ 5 * HZ
;
1647 /* Wait 1 second for next try */
1650 /* we don't understand the sense code, so it's
1651 * probably pointless to loop */
1653 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1654 sd_print_sense_hdr(sdkp
, &sshdr
);
1659 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1662 if (scsi_status_is_good(the_result
))
1665 printk("not responding...\n");
1671 * Determine whether disk supports Data Integrity Field.
1673 static void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1675 struct scsi_device
*sdp
= sdkp
->device
;
1678 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1681 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1683 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1686 sdkp
->protection_type
= type
;
1688 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1689 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1690 "protection type %u. Disabling disk!\n", type
);
1695 if (scsi_host_dif_capable(sdp
->host
, type
))
1696 sd_printk(KERN_NOTICE
, sdkp
,
1697 "Enabling DIF Type %u protection\n", type
);
1699 sd_printk(KERN_NOTICE
, sdkp
,
1700 "Disabling DIF Type %u protection\n", type
);
1703 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1704 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1707 sd_print_result(sdkp
, the_result
);
1708 if (driver_byte(the_result
) & DRIVER_SENSE
)
1709 sd_print_sense_hdr(sdkp
, sshdr
);
1711 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1714 * Set dirty bit for removable devices if not ready -
1715 * sometimes drives will not report this properly.
1717 if (sdp
->removable
&&
1718 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1719 set_media_not_present(sdkp
);
1722 * We used to set media_present to 0 here to indicate no media
1723 * in the drive, but some drives fail read capacity even with
1724 * media present, so we can't do that.
1726 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1730 #if RC16_LEN > SD_BUF_SIZE
1731 #error RC16_LEN must not be more than SD_BUF_SIZE
1734 #define READ_CAPACITY_RETRIES_ON_RESET 10
1736 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1737 unsigned char *buffer
)
1739 unsigned char cmd
[16];
1740 struct scsi_sense_hdr sshdr
;
1741 int sense_valid
= 0;
1743 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1744 unsigned int alignment
;
1745 unsigned long long lba
;
1746 unsigned sector_size
;
1748 if (sdp
->no_read_capacity_16
)
1753 cmd
[0] = SERVICE_ACTION_IN
;
1754 cmd
[1] = SAI_READ_CAPACITY_16
;
1756 memset(buffer
, 0, RC16_LEN
);
1758 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1759 buffer
, RC16_LEN
, &sshdr
,
1760 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1762 if (media_not_present(sdkp
, &sshdr
))
1766 sense_valid
= scsi_sense_valid(&sshdr
);
1768 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1769 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1771 /* Invalid Command Operation Code or
1772 * Invalid Field in CDB, just retry
1773 * silently with RC10 */
1776 sshdr
.sense_key
== UNIT_ATTENTION
&&
1777 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1778 /* Device reset might occur several times,
1779 * give it one more chance */
1780 if (--reset_retries
> 0)
1785 } while (the_result
&& retries
);
1788 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1789 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1793 sector_size
= get_unaligned_be32(&buffer
[8]);
1794 lba
= get_unaligned_be64(&buffer
[0]);
1796 sd_read_protection_type(sdkp
, buffer
);
1798 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1799 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1800 "kernel compiled with support for large block "
1806 /* Logical blocks per physical block exponent */
1807 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1809 /* Lowest aligned logical block */
1810 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1811 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1812 if (alignment
&& sdkp
->first_scan
)
1813 sd_printk(KERN_NOTICE
, sdkp
,
1814 "physical block alignment offset: %u\n", alignment
);
1816 if (buffer
[14] & 0x80) { /* LBPME */
1819 if (buffer
[14] & 0x40) /* LBPRZ */
1822 sd_config_discard(sdkp
, SD_LBP_WS16
);
1825 sdkp
->capacity
= lba
+ 1;
1829 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1830 unsigned char *buffer
)
1832 unsigned char cmd
[16];
1833 struct scsi_sense_hdr sshdr
;
1834 int sense_valid
= 0;
1836 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1838 unsigned sector_size
;
1841 cmd
[0] = READ_CAPACITY
;
1842 memset(&cmd
[1], 0, 9);
1843 memset(buffer
, 0, 8);
1845 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1847 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1849 if (media_not_present(sdkp
, &sshdr
))
1853 sense_valid
= scsi_sense_valid(&sshdr
);
1855 sshdr
.sense_key
== UNIT_ATTENTION
&&
1856 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1857 /* Device reset might occur several times,
1858 * give it one more chance */
1859 if (--reset_retries
> 0)
1864 } while (the_result
&& retries
);
1867 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1868 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1872 sector_size
= get_unaligned_be32(&buffer
[4]);
1873 lba
= get_unaligned_be32(&buffer
[0]);
1875 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
1876 /* Some buggy (usb cardreader) devices return an lba of
1877 0xffffffff when the want to report a size of 0 (with
1878 which they really mean no media is present) */
1880 sdkp
->physical_block_size
= sector_size
;
1884 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1885 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1886 "kernel compiled with support for large block "
1892 sdkp
->capacity
= lba
+ 1;
1893 sdkp
->physical_block_size
= sector_size
;
1897 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1899 if (sdp
->host
->max_cmd_len
< 16)
1901 if (sdp
->scsi_level
> SCSI_SPC_2
)
1903 if (scsi_device_protection(sdp
))
1909 * read disk capacity
1912 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1915 struct scsi_device
*sdp
= sdkp
->device
;
1916 sector_t old_capacity
= sdkp
->capacity
;
1918 if (sd_try_rc16_first(sdp
)) {
1919 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1920 if (sector_size
== -EOVERFLOW
)
1922 if (sector_size
== -ENODEV
)
1924 if (sector_size
< 0)
1925 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1926 if (sector_size
< 0)
1929 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1930 if (sector_size
== -EOVERFLOW
)
1932 if (sector_size
< 0)
1934 if ((sizeof(sdkp
->capacity
) > 4) &&
1935 (sdkp
->capacity
> 0xffffffffULL
)) {
1936 int old_sector_size
= sector_size
;
1937 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1938 "Trying to use READ CAPACITY(16).\n");
1939 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1940 if (sector_size
< 0) {
1941 sd_printk(KERN_NOTICE
, sdkp
,
1942 "Using 0xffffffff as device size\n");
1943 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1944 sector_size
= old_sector_size
;
1950 /* Some devices are known to return the total number of blocks,
1951 * not the highest block number. Some devices have versions
1952 * which do this and others which do not. Some devices we might
1953 * suspect of doing this but we don't know for certain.
1955 * If we know the reported capacity is wrong, decrement it. If
1956 * we can only guess, then assume the number of blocks is even
1957 * (usually true but not always) and err on the side of lowering
1960 if (sdp
->fix_capacity
||
1961 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1962 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1963 "from its reported value: %llu\n",
1964 (unsigned long long) sdkp
->capacity
);
1969 if (sector_size
== 0) {
1971 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1975 if (sector_size
!= 512 &&
1976 sector_size
!= 1024 &&
1977 sector_size
!= 2048 &&
1978 sector_size
!= 4096 &&
1979 sector_size
!= 256) {
1980 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1983 * The user might want to re-format the drive with
1984 * a supported sectorsize. Once this happens, it
1985 * would be relatively trivial to set the thing up.
1986 * For this reason, we leave the thing in the table.
1990 * set a bogus sector size so the normal read/write
1991 * logic in the block layer will eventually refuse any
1992 * request on this device without tripping over power
1993 * of two sector size assumptions
1997 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2000 char cap_str_2
[10], cap_str_10
[10];
2001 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2003 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2005 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2006 sizeof(cap_str_10
));
2008 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2009 sd_printk(KERN_NOTICE
, sdkp
,
2010 "%llu %d-byte logical blocks: (%s/%s)\n",
2011 (unsigned long long)sdkp
->capacity
,
2012 sector_size
, cap_str_10
, cap_str_2
);
2014 if (sdkp
->physical_block_size
!= sector_size
)
2015 sd_printk(KERN_NOTICE
, sdkp
,
2016 "%u-byte physical blocks\n",
2017 sdkp
->physical_block_size
);
2021 /* Rescale capacity to 512-byte units */
2022 if (sector_size
== 4096)
2023 sdkp
->capacity
<<= 3;
2024 else if (sector_size
== 2048)
2025 sdkp
->capacity
<<= 2;
2026 else if (sector_size
== 1024)
2027 sdkp
->capacity
<<= 1;
2028 else if (sector_size
== 256)
2029 sdkp
->capacity
>>= 1;
2031 blk_queue_physical_block_size(sdp
->request_queue
,
2032 sdkp
->physical_block_size
);
2033 sdkp
->device
->sector_size
= sector_size
;
2036 /* called with buffer of length 512 */
2038 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2039 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2040 struct scsi_sense_hdr
*sshdr
)
2042 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2043 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2048 * read write protect setting, if possible - called only in sd_revalidate_disk()
2049 * called with buffer of length SD_BUF_SIZE
2052 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2055 struct scsi_device
*sdp
= sdkp
->device
;
2056 struct scsi_mode_data data
;
2057 int old_wp
= sdkp
->write_prot
;
2059 set_disk_ro(sdkp
->disk
, 0);
2060 if (sdp
->skip_ms_page_3f
) {
2061 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2065 if (sdp
->use_192_bytes_for_3f
) {
2066 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2069 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2070 * We have to start carefully: some devices hang if we ask
2071 * for more than is available.
2073 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2076 * Second attempt: ask for page 0 When only page 0 is
2077 * implemented, a request for page 3F may return Sense Key
2078 * 5: Illegal Request, Sense Code 24: Invalid field in
2081 if (!scsi_status_is_good(res
))
2082 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2085 * Third attempt: ask 255 bytes, as we did earlier.
2087 if (!scsi_status_is_good(res
))
2088 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2092 if (!scsi_status_is_good(res
)) {
2093 sd_printk(KERN_WARNING
, sdkp
,
2094 "Test WP failed, assume Write Enabled\n");
2096 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2097 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2098 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2099 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2100 sdkp
->write_prot
? "on" : "off");
2101 sd_printk(KERN_DEBUG
, sdkp
,
2102 "Mode Sense: %02x %02x %02x %02x\n",
2103 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2109 * sd_read_cache_type - called only from sd_revalidate_disk()
2110 * called with buffer of length SD_BUF_SIZE
2113 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2116 struct scsi_device
*sdp
= sdkp
->device
;
2121 struct scsi_mode_data data
;
2122 struct scsi_sense_hdr sshdr
;
2123 int old_wce
= sdkp
->WCE
;
2124 int old_rcd
= sdkp
->RCD
;
2125 int old_dpofua
= sdkp
->DPOFUA
;
2128 if (sdp
->skip_ms_page_8
) {
2129 if (sdp
->type
== TYPE_RBC
)
2132 if (sdp
->skip_ms_page_3f
)
2135 if (sdp
->use_192_bytes_for_3f
)
2139 } else if (sdp
->type
== TYPE_RBC
) {
2147 /* cautiously ask */
2148 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2151 if (!scsi_status_is_good(res
))
2154 if (!data
.header_length
) {
2157 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2160 /* that went OK, now ask for the proper length */
2164 * We're only interested in the first three bytes, actually.
2165 * But the data cache page is defined for the first 20.
2169 else if (len
> SD_BUF_SIZE
) {
2170 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2171 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2174 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2178 if (len
> first_len
)
2179 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2182 if (scsi_status_is_good(res
)) {
2183 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2185 while (offset
< len
) {
2186 u8 page_code
= buffer
[offset
] & 0x3F;
2187 u8 spf
= buffer
[offset
] & 0x40;
2189 if (page_code
== 8 || page_code
== 6) {
2190 /* We're interested only in the first 3 bytes.
2192 if (len
- offset
<= 2) {
2193 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2194 "mode parameter data\n");
2197 modepage
= page_code
;
2201 /* Go to the next page */
2202 if (spf
&& len
- offset
> 3)
2203 offset
+= 4 + (buffer
[offset
+2] << 8) +
2205 else if (!spf
&& len
- offset
> 1)
2206 offset
+= 2 + buffer
[offset
+1];
2208 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2209 "mode parameter data\n");
2215 if (modepage
== 0x3F) {
2216 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page "
2219 } else if ((buffer
[offset
] & 0x3f) != modepage
) {
2220 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
2224 if (modepage
== 8) {
2225 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2226 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2228 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2232 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2233 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2234 sd_printk(KERN_NOTICE
, sdkp
,
2235 "Uses READ/WRITE(6), disabling FUA\n");
2239 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2240 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2241 sd_printk(KERN_NOTICE
, sdkp
,
2242 "Write cache: %s, read cache: %s, %s\n",
2243 sdkp
->WCE
? "enabled" : "disabled",
2244 sdkp
->RCD
? "disabled" : "enabled",
2245 sdkp
->DPOFUA
? "supports DPO and FUA"
2246 : "doesn't support DPO or FUA");
2252 if (scsi_sense_valid(&sshdr
) &&
2253 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2254 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2255 /* Invalid field in CDB */
2256 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2258 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2261 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2268 * The ATO bit indicates whether the DIF application tag is available
2269 * for use by the operating system.
2271 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2274 struct scsi_device
*sdp
= sdkp
->device
;
2275 struct scsi_mode_data data
;
2276 struct scsi_sense_hdr sshdr
;
2278 if (sdp
->type
!= TYPE_DISK
)
2281 if (sdkp
->protection_type
== 0)
2284 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2285 SD_MAX_RETRIES
, &data
, &sshdr
);
2287 if (!scsi_status_is_good(res
) || !data
.header_length
||
2289 sd_printk(KERN_WARNING
, sdkp
,
2290 "getting Control mode page failed, assume no ATO\n");
2292 if (scsi_sense_valid(&sshdr
))
2293 sd_print_sense_hdr(sdkp
, &sshdr
);
2298 offset
= data
.header_length
+ data
.block_descriptor_length
;
2300 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2301 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2305 if ((buffer
[offset
+ 5] & 0x80) == 0)
2314 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2315 * @disk: disk to query
2317 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2319 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2320 const int vpd_len
= 64;
2321 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2324 /* Block Limits VPD */
2325 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2328 blk_queue_io_min(sdkp
->disk
->queue
,
2329 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2330 blk_queue_io_opt(sdkp
->disk
->queue
,
2331 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2333 if (buffer
[3] == 0x3c) {
2334 unsigned int lba_count
, desc_count
;
2336 sdkp
->max_ws_blocks
=
2337 (u32
) min_not_zero(get_unaligned_be64(&buffer
[36]),
2343 lba_count
= get_unaligned_be32(&buffer
[20]);
2344 desc_count
= get_unaligned_be32(&buffer
[24]);
2346 if (lba_count
&& desc_count
)
2347 sdkp
->max_unmap_blocks
= lba_count
;
2349 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2351 if (buffer
[32] & 0x80)
2352 sdkp
->unmap_alignment
=
2353 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2355 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2357 if (sdkp
->max_unmap_blocks
)
2358 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2360 sd_config_discard(sdkp
, SD_LBP_WS16
);
2362 } else { /* LBP VPD page tells us what to use */
2364 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2365 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2366 else if (sdkp
->lbpws
)
2367 sd_config_discard(sdkp
, SD_LBP_WS16
);
2368 else if (sdkp
->lbpws10
)
2369 sd_config_discard(sdkp
, SD_LBP_WS10
);
2371 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2380 * sd_read_block_characteristics - Query block dev. characteristics
2381 * @disk: disk to query
2383 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2385 unsigned char *buffer
;
2387 const int vpd_len
= 64;
2389 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2392 /* Block Device Characteristics VPD */
2393 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2396 rot
= get_unaligned_be16(&buffer
[4]);
2399 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2406 * sd_read_block_provisioning - Query provisioning VPD page
2407 * @disk: disk to query
2409 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2411 unsigned char *buffer
;
2412 const int vpd_len
= 8;
2414 if (sdkp
->lbpme
== 0)
2417 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2419 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2423 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2424 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2425 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2431 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2434 * Although VPD inquiries can go to SCSI-2 type devices,
2435 * some USB ones crash on receiving them, and the pages
2436 * we currently ask for are for SPC-3 and beyond
2438 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2444 * sd_revalidate_disk - called the first time a new disk is seen,
2445 * performs disk spin up, read_capacity, etc.
2446 * @disk: struct gendisk we care about
2448 static int sd_revalidate_disk(struct gendisk
*disk
)
2450 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2451 struct scsi_device
*sdp
= sdkp
->device
;
2452 unsigned char *buffer
;
2455 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2456 "sd_revalidate_disk\n"));
2459 * If the device is offline, don't try and read capacity or any
2460 * of the other niceties.
2462 if (!scsi_device_online(sdp
))
2465 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2467 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2468 "allocation failure.\n");
2472 sd_spinup_disk(sdkp
);
2475 * Without media there is no reason to ask; moreover, some devices
2476 * react badly if we do.
2478 if (sdkp
->media_present
) {
2479 sd_read_capacity(sdkp
, buffer
);
2481 if (sd_try_extended_inquiry(sdp
)) {
2482 sd_read_block_provisioning(sdkp
);
2483 sd_read_block_limits(sdkp
);
2484 sd_read_block_characteristics(sdkp
);
2487 sd_read_write_protect_flag(sdkp
, buffer
);
2488 sd_read_cache_type(sdkp
, buffer
);
2489 sd_read_app_tag_own(sdkp
, buffer
);
2492 sdkp
->first_scan
= 0;
2495 * We now have all cache related info, determine how we deal
2496 * with flush requests.
2504 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2506 set_capacity(disk
, sdkp
->capacity
);
2514 * sd_unlock_native_capacity - unlock native capacity
2515 * @disk: struct gendisk to set capacity for
2517 * Block layer calls this function if it detects that partitions
2518 * on @disk reach beyond the end of the device. If the SCSI host
2519 * implements ->unlock_native_capacity() method, it's invoked to
2520 * give it a chance to adjust the device capacity.
2523 * Defined by block layer. Might sleep.
2525 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2527 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2529 if (sdev
->host
->hostt
->unlock_native_capacity
)
2530 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2534 * sd_format_disk_name - format disk name
2535 * @prefix: name prefix - ie. "sd" for SCSI disks
2536 * @index: index of the disk to format name for
2537 * @buf: output buffer
2538 * @buflen: length of the output buffer
2540 * SCSI disk names starts at sda. The 26th device is sdz and the
2541 * 27th is sdaa. The last one for two lettered suffix is sdzz
2542 * which is followed by sdaaa.
2544 * This is basically 26 base counting with one extra 'nil' entry
2545 * at the beginning from the second digit on and can be
2546 * determined using similar method as 26 base conversion with the
2547 * index shifted -1 after each digit is computed.
2553 * 0 on success, -errno on failure.
2555 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2557 const int base
= 'z' - 'a' + 1;
2558 char *begin
= buf
+ strlen(prefix
);
2559 char *end
= buf
+ buflen
;
2569 *--p
= 'a' + (index
% unit
);
2570 index
= (index
/ unit
) - 1;
2571 } while (index
>= 0);
2573 memmove(begin
, p
, end
- p
);
2574 memcpy(buf
, prefix
, strlen(prefix
));
2580 * The asynchronous part of sd_probe
2582 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2584 struct scsi_disk
*sdkp
= data
;
2585 struct scsi_device
*sdp
;
2592 index
= sdkp
->index
;
2593 dev
= &sdp
->sdev_gendev
;
2595 gd
->major
= sd_major((index
& 0xf0) >> 4);
2596 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2597 gd
->minors
= SD_MINORS
;
2599 gd
->fops
= &sd_fops
;
2600 gd
->private_data
= &sdkp
->driver
;
2601 gd
->queue
= sdkp
->device
->request_queue
;
2603 /* defaults, until the device tells us otherwise */
2604 sdp
->sector_size
= 512;
2606 sdkp
->media_present
= 1;
2607 sdkp
->write_prot
= 0;
2611 sdkp
->first_scan
= 1;
2612 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2614 sd_revalidate_disk(gd
);
2616 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2617 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2619 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2620 gd
->flags
= GENHD_FL_EXT_DEVT
;
2621 if (sdp
->removable
) {
2622 gd
->flags
|= GENHD_FL_REMOVABLE
;
2623 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2627 sd_dif_config_host(sdkp
);
2629 sd_revalidate_disk(gd
);
2631 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2632 sdp
->removable
? "removable " : "");
2633 scsi_autopm_put_device(sdp
);
2634 put_device(&sdkp
->dev
);
2638 * sd_probe - called during driver initialization and whenever a
2639 * new scsi device is attached to the system. It is called once
2640 * for each scsi device (not just disks) present.
2641 * @dev: pointer to device object
2643 * Returns 0 if successful (or not interested in this scsi device
2644 * (e.g. scanner)); 1 when there is an error.
2646 * Note: this function is invoked from the scsi mid-level.
2647 * This function sets up the mapping between a given
2648 * <host,channel,id,lun> (found in sdp) and new device name
2649 * (e.g. /dev/sda). More precisely it is the block device major
2650 * and minor number that is chosen here.
2652 * Assume sd_probe is not re-entrant (for time being)
2653 * Also think about sd_probe() and sd_remove() running coincidentally.
2655 static int sd_probe(struct device
*dev
)
2657 struct scsi_device
*sdp
= to_scsi_device(dev
);
2658 struct scsi_disk
*sdkp
;
2664 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2667 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2671 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2675 gd
= alloc_disk(SD_MINORS
);
2680 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2683 spin_lock(&sd_index_lock
);
2684 error
= ida_get_new(&sd_index_ida
, &index
);
2685 spin_unlock(&sd_index_lock
);
2686 } while (error
== -EAGAIN
);
2689 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2693 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2695 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2696 goto out_free_index
;
2700 sdkp
->driver
= &sd_template
;
2702 sdkp
->index
= index
;
2703 atomic_set(&sdkp
->openers
, 0);
2705 if (!sdp
->request_queue
->rq_timeout
) {
2706 if (sdp
->type
!= TYPE_MOD
)
2707 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2709 blk_queue_rq_timeout(sdp
->request_queue
,
2713 device_initialize(&sdkp
->dev
);
2714 sdkp
->dev
.parent
= dev
;
2715 sdkp
->dev
.class = &sd_disk_class
;
2716 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2718 if (device_add(&sdkp
->dev
))
2719 goto out_free_index
;
2722 dev_set_drvdata(dev
, sdkp
);
2724 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2725 async_schedule(sd_probe_async
, sdkp
);
2730 spin_lock(&sd_index_lock
);
2731 ida_remove(&sd_index_ida
, index
);
2732 spin_unlock(&sd_index_lock
);
2742 * sd_remove - called whenever a scsi disk (previously recognized by
2743 * sd_probe) is detached from the system. It is called (potentially
2744 * multiple times) during sd module unload.
2745 * @sdp: pointer to mid level scsi device object
2747 * Note: this function is invoked from the scsi mid-level.
2748 * This function potentially frees up a device name (e.g. /dev/sdc)
2749 * that could be re-used by a subsequent sd_probe().
2750 * This function is not called when the built-in sd driver is "exit-ed".
2752 static int sd_remove(struct device
*dev
)
2754 struct scsi_disk
*sdkp
;
2756 sdkp
= dev_get_drvdata(dev
);
2757 scsi_autopm_get_device(sdkp
->device
);
2759 async_synchronize_full();
2760 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2761 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2762 device_del(&sdkp
->dev
);
2763 del_gendisk(sdkp
->disk
);
2766 mutex_lock(&sd_ref_mutex
);
2767 dev_set_drvdata(dev
, NULL
);
2768 put_device(&sdkp
->dev
);
2769 mutex_unlock(&sd_ref_mutex
);
2775 * scsi_disk_release - Called to free the scsi_disk structure
2776 * @dev: pointer to embedded class device
2778 * sd_ref_mutex must be held entering this routine. Because it is
2779 * called on last put, you should always use the scsi_disk_get()
2780 * scsi_disk_put() helpers which manipulate the semaphore directly
2781 * and never do a direct put_device.
2783 static void scsi_disk_release(struct device
*dev
)
2785 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2786 struct gendisk
*disk
= sdkp
->disk
;
2788 spin_lock(&sd_index_lock
);
2789 ida_remove(&sd_index_ida
, sdkp
->index
);
2790 spin_unlock(&sd_index_lock
);
2792 disk
->private_data
= NULL
;
2794 put_device(&sdkp
->device
->sdev_gendev
);
2799 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2801 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2802 struct scsi_sense_hdr sshdr
;
2803 struct scsi_device
*sdp
= sdkp
->device
;
2807 cmd
[4] |= 1; /* START */
2809 if (sdp
->start_stop_pwr_cond
)
2810 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2812 if (!scsi_device_online(sdp
))
2815 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2816 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2818 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2819 sd_print_result(sdkp
, res
);
2820 if (driver_byte(res
) & DRIVER_SENSE
)
2821 sd_print_sense_hdr(sdkp
, &sshdr
);
2828 * Send a SYNCHRONIZE CACHE instruction down to the device through
2829 * the normal SCSI command structure. Wait for the command to
2832 static void sd_shutdown(struct device
*dev
)
2834 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2837 return; /* this can happen */
2839 if (pm_runtime_suspended(dev
))
2843 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2844 sd_sync_cache(sdkp
);
2847 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2848 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2849 sd_start_stop_device(sdkp
, 0);
2853 scsi_disk_put(sdkp
);
2856 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2858 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2862 return 0; /* this can happen */
2865 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2866 ret
= sd_sync_cache(sdkp
);
2871 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2872 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2873 ret
= sd_start_stop_device(sdkp
, 0);
2877 scsi_disk_put(sdkp
);
2881 static int sd_resume(struct device
*dev
)
2883 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2886 if (!sdkp
->device
->manage_start_stop
)
2889 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2890 ret
= sd_start_stop_device(sdkp
, 1);
2893 scsi_disk_put(sdkp
);
2898 * init_sd - entry point for this driver (both when built in or when
2901 * Note: this function registers this driver with the scsi mid-level.
2903 static int __init
init_sd(void)
2905 int majors
= 0, i
, err
;
2907 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2909 for (i
= 0; i
< SD_MAJORS
; i
++)
2910 if (register_blkdev(sd_major(i
), "sd") == 0)
2916 err
= class_register(&sd_disk_class
);
2920 err
= scsi_register_driver(&sd_template
.gendrv
);
2924 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2926 if (!sd_cdb_cache
) {
2927 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2931 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2933 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2940 kmem_cache_destroy(sd_cdb_cache
);
2943 class_unregister(&sd_disk_class
);
2945 for (i
= 0; i
< SD_MAJORS
; i
++)
2946 unregister_blkdev(sd_major(i
), "sd");
2951 * exit_sd - exit point for this driver (when it is a module).
2953 * Note: this function unregisters this driver from the scsi mid-level.
2955 static void __exit
exit_sd(void)
2959 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2961 mempool_destroy(sd_cdb_pool
);
2962 kmem_cache_destroy(sd_cdb_cache
);
2964 scsi_unregister_driver(&sd_template
.gendrv
);
2965 class_unregister(&sd_disk_class
);
2967 for (i
= 0; i
< SD_MAJORS
; i
++)
2968 unregister_blkdev(sd_major(i
), "sd");
2971 module_init(init_sd
);
2972 module_exit(exit_sd
);
2974 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2975 struct scsi_sense_hdr
*sshdr
)
2977 sd_printk(KERN_INFO
, sdkp
, " ");
2978 scsi_show_sense_hdr(sshdr
);
2979 sd_printk(KERN_INFO
, sdkp
, " ");
2980 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2983 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2985 sd_printk(KERN_INFO
, sdkp
, " ");
2986 scsi_show_result(result
);