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_priv.h"
69 #include "scsi_logging.h"
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
101 static void sd_config_discard(struct scsi_disk
*, unsigned int);
102 static void sd_config_write_same(struct scsi_disk
*);
103 static int sd_revalidate_disk(struct gendisk
*);
104 static void sd_unlock_native_capacity(struct gendisk
*disk
);
105 static int sd_probe(struct device
*);
106 static int sd_remove(struct device
*);
107 static void sd_shutdown(struct device
*);
108 static int sd_suspend(struct device
*, pm_message_t state
);
109 static int sd_resume(struct device
*);
110 static void sd_rescan(struct device
*);
111 static int sd_done(struct scsi_cmnd
*);
112 static int sd_eh_action(struct scsi_cmnd
*, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
114 static void scsi_disk_release(struct device
*cdev
);
115 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
116 static void sd_print_result(struct scsi_disk
*, int);
118 static DEFINE_SPINLOCK(sd_index_lock
);
119 static DEFINE_IDA(sd_index_ida
);
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex
);
126 static struct kmem_cache
*sd_cdb_cache
;
127 static mempool_t
*sd_cdb_pool
;
129 static const char *sd_cache_types
[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
135 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
136 const char *buf
, size_t count
)
138 int i
, ct
= -1, rcd
, wce
, sp
;
139 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
140 struct scsi_device
*sdp
= sdkp
->device
;
143 struct scsi_mode_data data
;
144 struct scsi_sense_hdr sshdr
;
147 if (sdp
->type
!= TYPE_DISK
)
148 /* no cache control on RBC devices; theoretically they
149 * can do it, but there's probably so many exceptions
150 * it's not worth the risk */
153 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
154 len
= strlen(sd_cache_types
[i
]);
155 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
163 rcd
= ct
& 0x01 ? 1 : 0;
164 wce
= ct
& 0x02 ? 1 : 0;
165 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
166 SD_MAX_RETRIES
, &data
, NULL
))
168 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
169 data
.block_descriptor_length
);
170 buffer_data
= buffer
+ data
.header_length
+
171 data
.block_descriptor_length
;
172 buffer_data
[2] &= ~0x05;
173 buffer_data
[2] |= wce
<< 2 | rcd
;
174 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
176 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
177 SD_MAX_RETRIES
, &data
, &sshdr
)) {
178 if (scsi_sense_valid(&sshdr
))
179 sd_print_sense_hdr(sdkp
, &sshdr
);
182 revalidate_disk(sdkp
->disk
);
187 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
188 const char *buf
, size_t count
)
190 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
191 struct scsi_device
*sdp
= sdkp
->device
;
193 if (!capable(CAP_SYS_ADMIN
))
196 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
202 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
203 const char *buf
, size_t count
)
205 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
206 struct scsi_device
*sdp
= sdkp
->device
;
208 if (!capable(CAP_SYS_ADMIN
))
211 if (sdp
->type
!= TYPE_DISK
)
214 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
220 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
223 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
224 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
226 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
230 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
232 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
234 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
238 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
241 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
242 struct scsi_device
*sdp
= sdkp
->device
;
244 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
248 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
251 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
253 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
257 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
260 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
262 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
266 sd_store_protection_type(struct device
*dev
, struct device_attribute
*attr
,
267 const char *buf
, size_t count
)
269 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
273 if (!capable(CAP_SYS_ADMIN
))
276 err
= kstrtouint(buf
, 10, &val
);
281 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
282 sdkp
->protection_type
= val
;
288 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
291 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
292 struct scsi_device
*sdp
= sdkp
->device
;
293 unsigned int dif
, dix
;
295 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
296 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
298 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
304 return snprintf(buf
, 20, "none\n");
306 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
310 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
313 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
315 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
319 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
322 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
324 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
327 static const char *lbp_mode
[] = {
328 [SD_LBP_FULL
] = "full",
329 [SD_LBP_UNMAP
] = "unmap",
330 [SD_LBP_WS16
] = "writesame_16",
331 [SD_LBP_WS10
] = "writesame_10",
332 [SD_LBP_ZERO
] = "writesame_zero",
333 [SD_LBP_DISABLE
] = "disabled",
337 sd_show_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
340 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
342 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
346 sd_store_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
347 const char *buf
, size_t count
)
349 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
350 struct scsi_device
*sdp
= sdkp
->device
;
352 if (!capable(CAP_SYS_ADMIN
))
355 if (sdp
->type
!= TYPE_DISK
)
358 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
359 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
360 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
361 sd_config_discard(sdkp
, SD_LBP_WS16
);
362 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
363 sd_config_discard(sdkp
, SD_LBP_WS10
);
364 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
365 sd_config_discard(sdkp
, SD_LBP_ZERO
);
366 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
367 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
375 sd_show_max_medium_access_timeouts(struct device
*dev
,
376 struct device_attribute
*attr
, char *buf
)
378 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
380 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
384 sd_store_max_medium_access_timeouts(struct device
*dev
,
385 struct device_attribute
*attr
,
386 const char *buf
, size_t count
)
388 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
391 if (!capable(CAP_SYS_ADMIN
))
394 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
396 return err
? err
: count
;
400 sd_show_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
403 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
405 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
409 sd_store_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
410 const char *buf
, size_t count
)
412 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
413 struct scsi_device
*sdp
= sdkp
->device
;
417 if (!capable(CAP_SYS_ADMIN
))
420 if (sdp
->type
!= TYPE_DISK
)
423 err
= kstrtoul(buf
, 10, &max
);
429 sdp
->no_write_same
= 1;
430 else if (max
<= SD_MAX_WS16_BLOCKS
)
431 sdkp
->max_ws_blocks
= max
;
433 sd_config_write_same(sdkp
);
438 static struct device_attribute sd_disk_attrs
[] = {
439 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
440 sd_store_cache_type
),
441 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
442 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
443 sd_store_allow_restart
),
444 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
445 sd_store_manage_start_stop
),
446 __ATTR(protection_type
, S_IRUGO
|S_IWUSR
, sd_show_protection_type
,
447 sd_store_protection_type
),
448 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
449 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
450 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
451 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
452 sd_store_provisioning_mode
),
453 __ATTR(max_write_same_blocks
, S_IRUGO
|S_IWUSR
,
454 sd_show_write_same_blocks
, sd_store_write_same_blocks
),
455 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
456 sd_show_max_medium_access_timeouts
,
457 sd_store_max_medium_access_timeouts
),
461 static struct class sd_disk_class
= {
463 .owner
= THIS_MODULE
,
464 .dev_release
= scsi_disk_release
,
465 .dev_attrs
= sd_disk_attrs
,
468 static struct scsi_driver sd_template
= {
469 .owner
= THIS_MODULE
,
474 .suspend
= sd_suspend
,
476 .shutdown
= sd_shutdown
,
480 .eh_action
= sd_eh_action
,
484 * Device no to disk mapping:
486 * major disc2 disc p1
487 * |............|.............|....|....| <- dev_t
490 * Inside a major, we have 16k disks, however mapped non-
491 * contiguously. The first 16 disks are for major0, the next
492 * ones with major1, ... Disk 256 is for major0 again, disk 272
494 * As we stay compatible with our numbering scheme, we can reuse
495 * the well-know SCSI majors 8, 65--71, 136--143.
497 static int sd_major(int major_idx
)
501 return SCSI_DISK0_MAJOR
;
503 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
505 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
508 return 0; /* shut up gcc */
512 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
514 struct scsi_disk
*sdkp
= NULL
;
516 if (disk
->private_data
) {
517 sdkp
= scsi_disk(disk
);
518 if (scsi_device_get(sdkp
->device
) == 0)
519 get_device(&sdkp
->dev
);
526 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
528 struct scsi_disk
*sdkp
;
530 mutex_lock(&sd_ref_mutex
);
531 sdkp
= __scsi_disk_get(disk
);
532 mutex_unlock(&sd_ref_mutex
);
536 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
538 struct scsi_disk
*sdkp
;
540 mutex_lock(&sd_ref_mutex
);
541 sdkp
= dev_get_drvdata(dev
);
543 sdkp
= __scsi_disk_get(sdkp
->disk
);
544 mutex_unlock(&sd_ref_mutex
);
548 static void scsi_disk_put(struct scsi_disk
*sdkp
)
550 struct scsi_device
*sdev
= sdkp
->device
;
552 mutex_lock(&sd_ref_mutex
);
553 put_device(&sdkp
->dev
);
554 scsi_device_put(sdev
);
555 mutex_unlock(&sd_ref_mutex
);
558 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
560 unsigned int prot_op
= SCSI_PROT_NORMAL
;
561 unsigned int dix
= scsi_prot_sg_count(scmd
);
563 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
565 prot_op
= SCSI_PROT_READ_PASS
;
566 else if (dif
&& !dix
)
567 prot_op
= SCSI_PROT_READ_STRIP
;
568 else if (!dif
&& dix
)
569 prot_op
= SCSI_PROT_READ_INSERT
;
572 prot_op
= SCSI_PROT_WRITE_PASS
;
573 else if (dif
&& !dix
)
574 prot_op
= SCSI_PROT_WRITE_INSERT
;
575 else if (!dif
&& dix
)
576 prot_op
= SCSI_PROT_WRITE_STRIP
;
579 scsi_set_prot_op(scmd
, prot_op
);
580 scsi_set_prot_type(scmd
, dif
);
583 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
585 struct request_queue
*q
= sdkp
->disk
->queue
;
586 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
587 unsigned int max_blocks
= 0;
589 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
590 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
592 q
->limits
.discard_granularity
=
593 max(sdkp
->physical_block_size
,
594 sdkp
->unmap_granularity
* logical_block_size
);
596 sdkp
->provisioning_mode
= mode
;
601 q
->limits
.max_discard_sectors
= 0;
602 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
606 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
607 (u32
)SD_MAX_WS16_BLOCKS
);
611 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
612 (u32
)SD_MAX_WS16_BLOCKS
);
616 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
617 (u32
)SD_MAX_WS10_BLOCKS
);
621 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
622 (u32
)SD_MAX_WS10_BLOCKS
);
623 q
->limits
.discard_zeroes_data
= 1;
627 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
628 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
632 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
633 * @sdp: scsi device to operate one
634 * @rq: Request to prepare
636 * Will issue either UNMAP or WRITE SAME(16) depending on preference
637 * indicated by target device.
639 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
641 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
642 sector_t sector
= blk_rq_pos(rq
);
643 unsigned int nr_sectors
= blk_rq_sectors(rq
);
644 unsigned int nr_bytes
= blk_rq_bytes(rq
);
650 sector
>>= ilog2(sdp
->sector_size
) - 9;
651 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
652 rq
->timeout
= SD_TIMEOUT
;
654 memset(rq
->cmd
, 0, rq
->cmd_len
);
656 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
658 return BLKPREP_DEFER
;
660 switch (sdkp
->provisioning_mode
) {
662 buf
= page_address(page
);
668 put_unaligned_be16(6 + 16, &buf
[0]);
669 put_unaligned_be16(16, &buf
[2]);
670 put_unaligned_be64(sector
, &buf
[8]);
671 put_unaligned_be32(nr_sectors
, &buf
[16]);
678 rq
->cmd
[0] = WRITE_SAME_16
;
679 rq
->cmd
[1] = 0x8; /* UNMAP */
680 put_unaligned_be64(sector
, &rq
->cmd
[2]);
681 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
683 len
= sdkp
->device
->sector_size
;
689 rq
->cmd
[0] = WRITE_SAME
;
690 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
691 rq
->cmd
[1] = 0x8; /* UNMAP */
692 put_unaligned_be32(sector
, &rq
->cmd
[2]);
693 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
695 len
= sdkp
->device
->sector_size
;
703 blk_add_request_payload(rq
, page
, len
);
704 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
705 rq
->buffer
= page_address(page
);
706 rq
->__data_len
= nr_bytes
;
709 if (ret
!= BLKPREP_OK
) {
716 static void sd_config_write_same(struct scsi_disk
*sdkp
)
718 struct request_queue
*q
= sdkp
->disk
->queue
;
719 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
720 unsigned int blocks
= 0;
722 if (sdkp
->device
->no_write_same
) {
723 sdkp
->max_ws_blocks
= 0;
727 /* Some devices can not handle block counts above 0xffff despite
728 * supporting WRITE SAME(16). Consequently we default to 64k
729 * blocks per I/O unless the device explicitly advertises a
732 if (sdkp
->max_ws_blocks
== 0)
733 sdkp
->max_ws_blocks
= SD_MAX_WS10_BLOCKS
;
735 if (sdkp
->ws16
|| sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
736 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
737 (u32
)SD_MAX_WS16_BLOCKS
);
739 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
740 (u32
)SD_MAX_WS10_BLOCKS
);
743 blk_queue_max_write_same_sectors(q
, blocks
* (logical_block_size
>> 9));
747 * sd_setup_write_same_cmnd - write the same data to multiple blocks
748 * @sdp: scsi device to operate one
749 * @rq: Request to prepare
751 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
752 * preference indicated by target device.
754 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
756 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
757 struct bio
*bio
= rq
->bio
;
758 sector_t sector
= blk_rq_pos(rq
);
759 unsigned int nr_sectors
= blk_rq_sectors(rq
);
760 unsigned int nr_bytes
= blk_rq_bytes(rq
);
763 if (sdkp
->device
->no_write_same
)
766 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
768 sector
>>= ilog2(sdp
->sector_size
) - 9;
769 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
771 rq
->__data_len
= sdp
->sector_size
;
772 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
773 memset(rq
->cmd
, 0, rq
->cmd_len
);
775 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
777 rq
->cmd
[0] = WRITE_SAME_16
;
778 put_unaligned_be64(sector
, &rq
->cmd
[2]);
779 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
782 rq
->cmd
[0] = WRITE_SAME
;
783 put_unaligned_be32(sector
, &rq
->cmd
[2]);
784 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
787 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
788 rq
->__data_len
= nr_bytes
;
793 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
795 rq
->timeout
= SD_FLUSH_TIMEOUT
;
796 rq
->retries
= SD_MAX_RETRIES
;
797 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
800 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
803 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
805 if (rq
->cmd_flags
& REQ_DISCARD
) {
806 free_page((unsigned long)rq
->buffer
);
812 * sd_prep_fn - build a scsi (read or write) command from
813 * information in the request structure.
814 * @SCpnt: pointer to mid-level's per scsi command structure that
815 * contains request and into which the scsi command is written
817 * Returns 1 if successful and 0 if error (or cannot be done now).
819 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
821 struct scsi_cmnd
*SCpnt
;
822 struct scsi_device
*sdp
= q
->queuedata
;
823 struct gendisk
*disk
= rq
->rq_disk
;
824 struct scsi_disk
*sdkp
;
825 sector_t block
= blk_rq_pos(rq
);
827 unsigned int this_count
= blk_rq_sectors(rq
);
829 unsigned char protect
;
832 * Discard request come in as REQ_TYPE_FS but we turn them into
833 * block PC requests to make life easier.
835 if (rq
->cmd_flags
& REQ_DISCARD
) {
836 ret
= sd_setup_discard_cmnd(sdp
, rq
);
838 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
839 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
841 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
842 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
844 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
845 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
847 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
851 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
852 if (ret
!= BLKPREP_OK
)
855 sdkp
= scsi_disk(disk
);
857 /* from here on until we're complete, any goto out
858 * is used for a killable error condition */
861 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
862 "sd_prep_fn: block=%llu, "
864 (unsigned long long)block
,
867 if (!sdp
|| !scsi_device_online(sdp
) ||
868 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
869 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
870 "Finishing %u sectors\n",
871 blk_rq_sectors(rq
)));
872 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
873 "Retry with 0x%p\n", SCpnt
));
879 * quietly refuse to do anything to a changed disc until
880 * the changed bit has been reset
882 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
887 * Some SD card readers can't handle multi-sector accesses which touch
888 * the last one or two hardware sectors. Split accesses as needed.
890 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
891 (sdp
->sector_size
/ 512);
893 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
894 if (block
< threshold
) {
895 /* Access up to the threshold but not beyond */
896 this_count
= threshold
- block
;
898 /* Access only a single hardware sector */
899 this_count
= sdp
->sector_size
/ 512;
903 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
904 (unsigned long long)block
));
907 * If we have a 1K hardware sectorsize, prevent access to single
908 * 512 byte sectors. In theory we could handle this - in fact
909 * the scsi cdrom driver must be able to handle this because
910 * we typically use 1K blocksizes, and cdroms typically have
911 * 2K hardware sectorsizes. Of course, things are simpler
912 * with the cdrom, since it is read-only. For performance
913 * reasons, the filesystems should be able to handle this
914 * and not force the scsi disk driver to use bounce buffers
917 if (sdp
->sector_size
== 1024) {
918 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
919 scmd_printk(KERN_ERR
, SCpnt
,
920 "Bad block number requested\n");
924 this_count
= this_count
>> 1;
927 if (sdp
->sector_size
== 2048) {
928 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
929 scmd_printk(KERN_ERR
, SCpnt
,
930 "Bad block number requested\n");
934 this_count
= this_count
>> 2;
937 if (sdp
->sector_size
== 4096) {
938 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
939 scmd_printk(KERN_ERR
, SCpnt
,
940 "Bad block number requested\n");
944 this_count
= this_count
>> 3;
947 if (rq_data_dir(rq
) == WRITE
) {
948 if (!sdp
->writeable
) {
951 SCpnt
->cmnd
[0] = WRITE_6
;
952 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
954 if (blk_integrity_rq(rq
))
955 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
957 } else if (rq_data_dir(rq
) == READ
) {
958 SCpnt
->cmnd
[0] = READ_6
;
959 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
961 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
965 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
966 "%s %d/%u 512 byte blocks.\n",
967 (rq_data_dir(rq
) == WRITE
) ?
968 "writing" : "reading", this_count
,
969 blk_rq_sectors(rq
)));
971 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
972 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
978 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
979 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
981 if (unlikely(SCpnt
->cmnd
== NULL
)) {
986 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
987 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
988 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
989 SCpnt
->cmnd
[7] = 0x18;
990 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
991 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
994 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
995 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
996 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
997 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
998 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
999 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1000 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1001 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1003 /* Expected Indirect LBA */
1004 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1005 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1006 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1007 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1009 /* Transfer length */
1010 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1011 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1012 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1013 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1014 } else if (block
> 0xffffffff) {
1015 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1016 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1017 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1018 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1019 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1020 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1021 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1022 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1023 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1024 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1025 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1026 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1027 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1028 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1029 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1030 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1031 scsi_device_protection(SCpnt
->device
) ||
1032 SCpnt
->device
->use_10_for_rw
) {
1033 if (this_count
> 0xffff)
1034 this_count
= 0xffff;
1036 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1037 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1038 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1039 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1040 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1041 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1042 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1043 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1044 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1046 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1048 * This happens only if this drive failed
1049 * 10byte rw command with ILLEGAL_REQUEST
1050 * during operation and thus turned off
1053 scmd_printk(KERN_ERR
, SCpnt
,
1054 "FUA write on READ/WRITE(6) drive\n");
1058 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1059 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1060 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1061 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1064 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1066 /* If DIF or DIX is enabled, tell HBA how to handle request */
1067 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1068 sd_prot_op(SCpnt
, host_dif
);
1071 * We shouldn't disconnect in the middle of a sector, so with a dumb
1072 * host adapter, it's safe to assume that we can at least transfer
1073 * this many bytes between each connect / disconnect.
1075 SCpnt
->transfersize
= sdp
->sector_size
;
1076 SCpnt
->underflow
= this_count
<< 9;
1077 SCpnt
->allowed
= SD_MAX_RETRIES
;
1080 * This indicates that the command is ready from our end to be
1085 return scsi_prep_return(q
, rq
, ret
);
1089 * sd_open - open a scsi disk device
1090 * @inode: only i_rdev member may be used
1091 * @filp: only f_mode and f_flags may be used
1093 * Returns 0 if successful. Returns a negated errno value in case
1096 * Note: This can be called from a user context (e.g. fsck(1) )
1097 * or from within the kernel (e.g. as a result of a mount(1) ).
1098 * In the latter case @inode and @filp carry an abridged amount
1099 * of information as noted above.
1101 * Locking: called with bdev->bd_mutex held.
1103 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1105 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1106 struct scsi_device
*sdev
;
1112 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1114 sdev
= sdkp
->device
;
1116 retval
= scsi_autopm_get_device(sdev
);
1121 * If the device is in error recovery, wait until it is done.
1122 * If the device is offline, then disallow any access to it.
1125 if (!scsi_block_when_processing_errors(sdev
))
1128 if (sdev
->removable
|| sdkp
->write_prot
)
1129 check_disk_change(bdev
);
1132 * If the drive is empty, just let the open fail.
1134 retval
= -ENOMEDIUM
;
1135 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1139 * If the device has the write protect tab set, have the open fail
1140 * if the user expects to be able to write to the thing.
1143 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1147 * It is possible that the disk changing stuff resulted in
1148 * the device being taken offline. If this is the case,
1149 * report this to the user, and don't pretend that the
1150 * open actually succeeded.
1153 if (!scsi_device_online(sdev
))
1156 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1157 if (scsi_block_when_processing_errors(sdev
))
1158 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1164 scsi_autopm_put_device(sdev
);
1166 scsi_disk_put(sdkp
);
1171 * sd_release - invoked when the (last) close(2) is called on this
1173 * @inode: only i_rdev member may be used
1174 * @filp: only f_mode and f_flags may be used
1178 * Note: may block (uninterruptible) if error recovery is underway
1181 * Locking: called with bdev->bd_mutex held.
1183 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
1185 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1186 struct scsi_device
*sdev
= sdkp
->device
;
1188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1190 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1191 if (scsi_block_when_processing_errors(sdev
))
1192 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1196 * XXX and what if there are packets in flight and this close()
1197 * XXX is followed by a "rmmod sd_mod"?
1200 scsi_autopm_put_device(sdev
);
1201 scsi_disk_put(sdkp
);
1205 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1207 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1208 struct scsi_device
*sdp
= sdkp
->device
;
1209 struct Scsi_Host
*host
= sdp
->host
;
1212 /* default to most commonly used values */
1213 diskinfo
[0] = 0x40; /* 1 << 6 */
1214 diskinfo
[1] = 0x20; /* 1 << 5 */
1215 diskinfo
[2] = sdkp
->capacity
>> 11;
1217 /* override with calculated, extended default, or driver values */
1218 if (host
->hostt
->bios_param
)
1219 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1221 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1223 geo
->heads
= diskinfo
[0];
1224 geo
->sectors
= diskinfo
[1];
1225 geo
->cylinders
= diskinfo
[2];
1230 * sd_ioctl - process an ioctl
1231 * @inode: only i_rdev/i_bdev members may be used
1232 * @filp: only f_mode and f_flags may be used
1233 * @cmd: ioctl command number
1234 * @arg: this is third argument given to ioctl(2) system call.
1235 * Often contains a pointer.
1237 * Returns 0 if successful (some ioctls return positive numbers on
1238 * success as well). Returns a negated errno value in case of error.
1240 * Note: most ioctls are forward onto the block subsystem or further
1241 * down in the scsi subsystem.
1243 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1244 unsigned int cmd
, unsigned long arg
)
1246 struct gendisk
*disk
= bdev
->bd_disk
;
1247 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1248 struct scsi_device
*sdp
= sdkp
->device
;
1249 void __user
*p
= (void __user
*)arg
;
1252 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1253 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1255 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1260 * If we are in the middle of error recovery, don't let anyone
1261 * else try and use this device. Also, if error recovery fails, it
1262 * may try and take the device offline, in which case all further
1263 * access to the device is prohibited.
1265 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1266 (mode
& FMODE_NDELAY
) != 0);
1267 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1271 * Send SCSI addressing ioctls directly to mid level, send other
1272 * ioctls to block level and then onto mid level if they can't be
1276 case SCSI_IOCTL_GET_IDLUN
:
1277 case SCSI_IOCTL_GET_BUS_NUMBER
:
1278 error
= scsi_ioctl(sdp
, cmd
, p
);
1281 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1282 if (error
!= -ENOTTY
)
1284 error
= scsi_ioctl(sdp
, cmd
, p
);
1291 static void set_media_not_present(struct scsi_disk
*sdkp
)
1293 if (sdkp
->media_present
)
1294 sdkp
->device
->changed
= 1;
1296 if (sdkp
->device
->removable
) {
1297 sdkp
->media_present
= 0;
1302 static int media_not_present(struct scsi_disk
*sdkp
,
1303 struct scsi_sense_hdr
*sshdr
)
1305 if (!scsi_sense_valid(sshdr
))
1308 /* not invoked for commands that could return deferred errors */
1309 switch (sshdr
->sense_key
) {
1310 case UNIT_ATTENTION
:
1312 /* medium not present */
1313 if (sshdr
->asc
== 0x3A) {
1314 set_media_not_present(sdkp
);
1322 * sd_check_events - check media events
1323 * @disk: kernel device descriptor
1324 * @clearing: disk events currently being cleared
1326 * Returns mask of DISK_EVENT_*.
1328 * Note: this function is invoked from the block subsystem.
1330 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1332 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1333 struct scsi_device
*sdp
= sdkp
->device
;
1334 struct scsi_sense_hdr
*sshdr
= NULL
;
1337 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1340 * If the device is offline, don't send any commands - just pretend as
1341 * if the command failed. If the device ever comes back online, we
1342 * can deal with it then. It is only because of unrecoverable errors
1343 * that we would ever take a device offline in the first place.
1345 if (!scsi_device_online(sdp
)) {
1346 set_media_not_present(sdkp
);
1351 * Using TEST_UNIT_READY enables differentiation between drive with
1352 * no cartridge loaded - NOT READY, drive with changed cartridge -
1353 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1355 * Drives that auto spin down. eg iomega jaz 1G, will be started
1356 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1357 * sd_revalidate() is called.
1361 if (scsi_block_when_processing_errors(sdp
)) {
1362 retval
= scsi_autopm_get_device(sdp
);
1366 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1367 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1369 scsi_autopm_put_device(sdp
);
1372 /* failed to execute TUR, assume media not present */
1373 if (host_byte(retval
)) {
1374 set_media_not_present(sdkp
);
1378 if (media_not_present(sdkp
, sshdr
))
1382 * For removable scsi disk we have to recognise the presence
1383 * of a disk in the drive.
1385 if (!sdkp
->media_present
)
1387 sdkp
->media_present
= 1;
1390 * sdp->changed is set under the following conditions:
1392 * Medium present state has changed in either direction.
1393 * Device has indicated UNIT_ATTENTION.
1396 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1401 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1404 struct scsi_device
*sdp
= sdkp
->device
;
1405 struct scsi_sense_hdr sshdr
;
1407 if (!scsi_device_online(sdp
))
1411 for (retries
= 3; retries
> 0; --retries
) {
1412 unsigned char cmd
[10] = { 0 };
1414 cmd
[0] = SYNCHRONIZE_CACHE
;
1416 * Leave the rest of the command zero to indicate
1419 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1420 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1426 sd_print_result(sdkp
, res
);
1427 if (driver_byte(res
) & DRIVER_SENSE
)
1428 sd_print_sense_hdr(sdkp
, &sshdr
);
1436 static void sd_rescan(struct device
*dev
)
1438 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1441 revalidate_disk(sdkp
->disk
);
1442 scsi_disk_put(sdkp
);
1447 #ifdef CONFIG_COMPAT
1449 * This gets directly called from VFS. When the ioctl
1450 * is not recognized we go back to the other translation paths.
1452 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1453 unsigned int cmd
, unsigned long arg
)
1455 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1458 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1463 * If we are in the middle of error recovery, don't let anyone
1464 * else try and use this device. Also, if error recovery fails, it
1465 * may try and take the device offline, in which case all further
1466 * access to the device is prohibited.
1468 if (!scsi_block_when_processing_errors(sdev
))
1471 if (sdev
->host
->hostt
->compat_ioctl
) {
1472 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1478 * Let the static ioctl translation table take care of it.
1480 return -ENOIOCTLCMD
;
1484 static const struct block_device_operations sd_fops
= {
1485 .owner
= THIS_MODULE
,
1487 .release
= sd_release
,
1489 .getgeo
= sd_getgeo
,
1490 #ifdef CONFIG_COMPAT
1491 .compat_ioctl
= sd_compat_ioctl
,
1493 .check_events
= sd_check_events
,
1494 .revalidate_disk
= sd_revalidate_disk
,
1495 .unlock_native_capacity
= sd_unlock_native_capacity
,
1499 * sd_eh_action - error handling callback
1500 * @scmd: sd-issued command that has failed
1501 * @eh_cmnd: The command that was sent during error handling
1502 * @eh_cmnd_len: Length of eh_cmnd in bytes
1503 * @eh_disp: The recovery disposition suggested by the midlayer
1505 * This function is called by the SCSI midlayer upon completion of
1506 * an error handling command (TEST UNIT READY, START STOP UNIT,
1507 * etc.) The command sent to the device by the error handler is
1508 * stored in eh_cmnd. The result of sending the eh command is
1509 * passed in eh_disp.
1511 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1512 int eh_cmnd_len
, int eh_disp
)
1514 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1516 if (!scsi_device_online(scmd
->device
) ||
1517 !scsi_medium_access_command(scmd
))
1521 * The device has timed out executing a medium access command.
1522 * However, the TEST UNIT READY command sent during error
1523 * handling completed successfully. Either the device is in the
1524 * process of recovering or has it suffered an internal failure
1525 * that prevents access to the storage medium.
1527 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1528 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1529 sdkp
->medium_access_timed_out
++;
1532 * If the device keeps failing read/write commands but TEST UNIT
1533 * READY always completes successfully we assume that medium
1534 * access is no longer possible and take the device offline.
1536 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1537 scmd_printk(KERN_ERR
, scmd
,
1538 "Medium access timeout failure. Offlining disk!\n");
1539 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1547 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1549 u64 start_lba
= blk_rq_pos(scmd
->request
);
1550 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1554 * resid is optional but mostly filled in. When it's unused,
1555 * its value is zero, so we assume the whole buffer transferred
1557 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1558 unsigned int good_bytes
;
1560 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1563 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1564 SCSI_SENSE_BUFFERSIZE
,
1569 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1572 if (scmd
->device
->sector_size
< 512) {
1573 /* only legitimate sector_size here is 256 */
1577 /* be careful ... don't want any overflows */
1578 u64 factor
= scmd
->device
->sector_size
/ 512;
1579 do_div(start_lba
, factor
);
1580 do_div(end_lba
, factor
);
1583 /* The bad lba was reported incorrectly, we have no idea where
1586 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1589 /* This computation should always be done in terms of
1590 * the resolution of the device's medium.
1592 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1593 return min(good_bytes
, transferred
);
1597 * sd_done - bottom half handler: called when the lower level
1598 * driver has completed (successfully or otherwise) a scsi command.
1599 * @SCpnt: mid-level's per command structure.
1601 * Note: potentially run from within an ISR. Must not block.
1603 static int sd_done(struct scsi_cmnd
*SCpnt
)
1605 int result
= SCpnt
->result
;
1606 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1607 struct scsi_sense_hdr sshdr
;
1608 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1609 struct request
*req
= SCpnt
->request
;
1610 int sense_valid
= 0;
1611 int sense_deferred
= 0;
1612 unsigned char op
= SCpnt
->cmnd
[0];
1613 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1615 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1617 good_bytes
= blk_rq_bytes(req
);
1618 scsi_set_resid(SCpnt
, 0);
1621 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1626 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1628 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1630 #ifdef CONFIG_SCSI_LOGGING
1631 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1633 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1634 "sd_done: sb[respc,sk,asc,"
1635 "ascq]=%x,%x,%x,%x\n",
1636 sshdr
.response_code
,
1637 sshdr
.sense_key
, sshdr
.asc
,
1641 if (driver_byte(result
) != DRIVER_SENSE
&&
1642 (!sense_valid
|| sense_deferred
))
1645 sdkp
->medium_access_timed_out
= 0;
1647 switch (sshdr
.sense_key
) {
1648 case HARDWARE_ERROR
:
1650 good_bytes
= sd_completed_bytes(SCpnt
);
1652 case RECOVERED_ERROR
:
1653 good_bytes
= scsi_bufflen(SCpnt
);
1656 /* This indicates a false check condition, so ignore it. An
1657 * unknown amount of data was transferred so treat it as an
1660 scsi_print_sense("sd", SCpnt
);
1662 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1664 case ABORTED_COMMAND
:
1665 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1666 good_bytes
= sd_completed_bytes(SCpnt
);
1668 case ILLEGAL_REQUEST
:
1669 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1670 good_bytes
= sd_completed_bytes(SCpnt
);
1671 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1672 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1675 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1680 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1682 sdkp
->device
->no_write_same
= 1;
1683 sd_config_write_same(sdkp
);
1686 req
->__data_len
= blk_rq_bytes(req
);
1687 req
->cmd_flags
|= REQ_QUIET
;
1696 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1697 sd_dif_complete(SCpnt
, good_bytes
);
1699 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1700 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1702 /* We have to print a failed command here as the
1703 * extended CDB gets freed before scsi_io_completion()
1707 scsi_print_command(SCpnt
);
1709 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1718 * spinup disk - called only in sd_revalidate_disk()
1721 sd_spinup_disk(struct scsi_disk
*sdkp
)
1723 unsigned char cmd
[10];
1724 unsigned long spintime_expire
= 0;
1725 int retries
, spintime
;
1726 unsigned int the_result
;
1727 struct scsi_sense_hdr sshdr
;
1728 int sense_valid
= 0;
1732 /* Spin up drives, as required. Only do this at boot time */
1733 /* Spinup needs to be done for module loads too. */
1738 cmd
[0] = TEST_UNIT_READY
;
1739 memset((void *) &cmd
[1], 0, 9);
1741 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1744 SD_MAX_RETRIES
, NULL
);
1747 * If the drive has indicated to us that it
1748 * doesn't have any media in it, don't bother
1749 * with any more polling.
1751 if (media_not_present(sdkp
, &sshdr
))
1755 sense_valid
= scsi_sense_valid(&sshdr
);
1757 } while (retries
< 3 &&
1758 (!scsi_status_is_good(the_result
) ||
1759 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1760 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1762 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1763 /* no sense, TUR either succeeded or failed
1764 * with a status error */
1765 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1766 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1767 sd_print_result(sdkp
, the_result
);
1773 * The device does not want the automatic start to be issued.
1775 if (sdkp
->device
->no_start_on_add
)
1778 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1779 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1780 break; /* manual intervention required */
1781 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1782 break; /* standby */
1783 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1784 break; /* unavailable */
1786 * Issue command to spin up drive when not ready
1789 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1790 cmd
[0] = START_STOP
;
1791 cmd
[1] = 1; /* Return immediately */
1792 memset((void *) &cmd
[2], 0, 8);
1793 cmd
[4] = 1; /* Start spin cycle */
1794 if (sdkp
->device
->start_stop_pwr_cond
)
1796 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1798 SD_TIMEOUT
, SD_MAX_RETRIES
,
1800 spintime_expire
= jiffies
+ 100 * HZ
;
1803 /* Wait 1 second for next try */
1808 * Wait for USB flash devices with slow firmware.
1809 * Yes, this sense key/ASC combination shouldn't
1810 * occur here. It's characteristic of these devices.
1812 } else if (sense_valid
&&
1813 sshdr
.sense_key
== UNIT_ATTENTION
&&
1814 sshdr
.asc
== 0x28) {
1816 spintime_expire
= jiffies
+ 5 * HZ
;
1819 /* Wait 1 second for next try */
1822 /* we don't understand the sense code, so it's
1823 * probably pointless to loop */
1825 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1826 sd_print_sense_hdr(sdkp
, &sshdr
);
1831 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1834 if (scsi_status_is_good(the_result
))
1837 printk("not responding...\n");
1843 * Determine whether disk supports Data Integrity Field.
1845 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1847 struct scsi_device
*sdp
= sdkp
->device
;
1851 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1854 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1856 if (type
> SD_DIF_TYPE3_PROTECTION
)
1858 else if (scsi_host_dif_capable(sdp
->host
, type
))
1861 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1864 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1865 " protection type %u. Disabling disk!\n",
1869 sd_printk(KERN_NOTICE
, sdkp
,
1870 "Enabling DIF Type %u protection\n", type
);
1873 sd_printk(KERN_NOTICE
, sdkp
,
1874 "Disabling DIF Type %u protection\n", type
);
1878 sdkp
->protection_type
= type
;
1883 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1884 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1887 sd_print_result(sdkp
, the_result
);
1888 if (driver_byte(the_result
) & DRIVER_SENSE
)
1889 sd_print_sense_hdr(sdkp
, sshdr
);
1891 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1894 * Set dirty bit for removable devices if not ready -
1895 * sometimes drives will not report this properly.
1897 if (sdp
->removable
&&
1898 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1899 set_media_not_present(sdkp
);
1902 * We used to set media_present to 0 here to indicate no media
1903 * in the drive, but some drives fail read capacity even with
1904 * media present, so we can't do that.
1906 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1910 #if RC16_LEN > SD_BUF_SIZE
1911 #error RC16_LEN must not be more than SD_BUF_SIZE
1914 #define READ_CAPACITY_RETRIES_ON_RESET 10
1916 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1917 unsigned char *buffer
)
1919 unsigned char cmd
[16];
1920 struct scsi_sense_hdr sshdr
;
1921 int sense_valid
= 0;
1923 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1924 unsigned int alignment
;
1925 unsigned long long lba
;
1926 unsigned sector_size
;
1928 if (sdp
->no_read_capacity_16
)
1933 cmd
[0] = SERVICE_ACTION_IN
;
1934 cmd
[1] = SAI_READ_CAPACITY_16
;
1936 memset(buffer
, 0, RC16_LEN
);
1938 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1939 buffer
, RC16_LEN
, &sshdr
,
1940 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1942 if (media_not_present(sdkp
, &sshdr
))
1946 sense_valid
= scsi_sense_valid(&sshdr
);
1948 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1949 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1951 /* Invalid Command Operation Code or
1952 * Invalid Field in CDB, just retry
1953 * silently with RC10 */
1956 sshdr
.sense_key
== UNIT_ATTENTION
&&
1957 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1958 /* Device reset might occur several times,
1959 * give it one more chance */
1960 if (--reset_retries
> 0)
1965 } while (the_result
&& retries
);
1968 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1969 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1973 sector_size
= get_unaligned_be32(&buffer
[8]);
1974 lba
= get_unaligned_be64(&buffer
[0]);
1976 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
1981 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1982 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1983 "kernel compiled with support for large block "
1989 /* Logical blocks per physical block exponent */
1990 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1992 /* Lowest aligned logical block */
1993 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1994 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1995 if (alignment
&& sdkp
->first_scan
)
1996 sd_printk(KERN_NOTICE
, sdkp
,
1997 "physical block alignment offset: %u\n", alignment
);
1999 if (buffer
[14] & 0x80) { /* LBPME */
2002 if (buffer
[14] & 0x40) /* LBPRZ */
2005 sd_config_discard(sdkp
, SD_LBP_WS16
);
2008 sdkp
->capacity
= lba
+ 1;
2012 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2013 unsigned char *buffer
)
2015 unsigned char cmd
[16];
2016 struct scsi_sense_hdr sshdr
;
2017 int sense_valid
= 0;
2019 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2021 unsigned sector_size
;
2024 cmd
[0] = READ_CAPACITY
;
2025 memset(&cmd
[1], 0, 9);
2026 memset(buffer
, 0, 8);
2028 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2030 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2032 if (media_not_present(sdkp
, &sshdr
))
2036 sense_valid
= scsi_sense_valid(&sshdr
);
2038 sshdr
.sense_key
== UNIT_ATTENTION
&&
2039 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2040 /* Device reset might occur several times,
2041 * give it one more chance */
2042 if (--reset_retries
> 0)
2047 } while (the_result
&& retries
);
2050 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2051 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2055 sector_size
= get_unaligned_be32(&buffer
[4]);
2056 lba
= get_unaligned_be32(&buffer
[0]);
2058 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2059 /* Some buggy (usb cardreader) devices return an lba of
2060 0xffffffff when the want to report a size of 0 (with
2061 which they really mean no media is present) */
2063 sdkp
->physical_block_size
= sector_size
;
2067 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2068 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2069 "kernel compiled with support for large block "
2075 sdkp
->capacity
= lba
+ 1;
2076 sdkp
->physical_block_size
= sector_size
;
2080 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2082 if (sdp
->host
->max_cmd_len
< 16)
2084 if (sdp
->try_rc_10_first
)
2086 if (sdp
->scsi_level
> SCSI_SPC_2
)
2088 if (scsi_device_protection(sdp
))
2094 * read disk capacity
2097 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2100 struct scsi_device
*sdp
= sdkp
->device
;
2101 sector_t old_capacity
= sdkp
->capacity
;
2103 if (sd_try_rc16_first(sdp
)) {
2104 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2105 if (sector_size
== -EOVERFLOW
)
2107 if (sector_size
== -ENODEV
)
2109 if (sector_size
< 0)
2110 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2111 if (sector_size
< 0)
2114 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2115 if (sector_size
== -EOVERFLOW
)
2117 if (sector_size
< 0)
2119 if ((sizeof(sdkp
->capacity
) > 4) &&
2120 (sdkp
->capacity
> 0xffffffffULL
)) {
2121 int old_sector_size
= sector_size
;
2122 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2123 "Trying to use READ CAPACITY(16).\n");
2124 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2125 if (sector_size
< 0) {
2126 sd_printk(KERN_NOTICE
, sdkp
,
2127 "Using 0xffffffff as device size\n");
2128 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2129 sector_size
= old_sector_size
;
2135 /* Some devices are known to return the total number of blocks,
2136 * not the highest block number. Some devices have versions
2137 * which do this and others which do not. Some devices we might
2138 * suspect of doing this but we don't know for certain.
2140 * If we know the reported capacity is wrong, decrement it. If
2141 * we can only guess, then assume the number of blocks is even
2142 * (usually true but not always) and err on the side of lowering
2145 if (sdp
->fix_capacity
||
2146 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2147 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2148 "from its reported value: %llu\n",
2149 (unsigned long long) sdkp
->capacity
);
2154 if (sector_size
== 0) {
2156 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2160 if (sector_size
!= 512 &&
2161 sector_size
!= 1024 &&
2162 sector_size
!= 2048 &&
2163 sector_size
!= 4096 &&
2164 sector_size
!= 256) {
2165 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2168 * The user might want to re-format the drive with
2169 * a supported sectorsize. Once this happens, it
2170 * would be relatively trivial to set the thing up.
2171 * For this reason, we leave the thing in the table.
2175 * set a bogus sector size so the normal read/write
2176 * logic in the block layer will eventually refuse any
2177 * request on this device without tripping over power
2178 * of two sector size assumptions
2182 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2185 char cap_str_2
[10], cap_str_10
[10];
2186 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2188 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2190 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2191 sizeof(cap_str_10
));
2193 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2194 sd_printk(KERN_NOTICE
, sdkp
,
2195 "%llu %d-byte logical blocks: (%s/%s)\n",
2196 (unsigned long long)sdkp
->capacity
,
2197 sector_size
, cap_str_10
, cap_str_2
);
2199 if (sdkp
->physical_block_size
!= sector_size
)
2200 sd_printk(KERN_NOTICE
, sdkp
,
2201 "%u-byte physical blocks\n",
2202 sdkp
->physical_block_size
);
2206 /* Rescale capacity to 512-byte units */
2207 if (sector_size
== 4096)
2208 sdkp
->capacity
<<= 3;
2209 else if (sector_size
== 2048)
2210 sdkp
->capacity
<<= 2;
2211 else if (sector_size
== 1024)
2212 sdkp
->capacity
<<= 1;
2213 else if (sector_size
== 256)
2214 sdkp
->capacity
>>= 1;
2216 blk_queue_physical_block_size(sdp
->request_queue
,
2217 sdkp
->physical_block_size
);
2218 sdkp
->device
->sector_size
= sector_size
;
2221 /* called with buffer of length 512 */
2223 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2224 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2225 struct scsi_sense_hdr
*sshdr
)
2227 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2228 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2233 * read write protect setting, if possible - called only in sd_revalidate_disk()
2234 * called with buffer of length SD_BUF_SIZE
2237 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2240 struct scsi_device
*sdp
= sdkp
->device
;
2241 struct scsi_mode_data data
;
2242 int old_wp
= sdkp
->write_prot
;
2244 set_disk_ro(sdkp
->disk
, 0);
2245 if (sdp
->skip_ms_page_3f
) {
2246 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2250 if (sdp
->use_192_bytes_for_3f
) {
2251 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2254 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2255 * We have to start carefully: some devices hang if we ask
2256 * for more than is available.
2258 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2261 * Second attempt: ask for page 0 When only page 0 is
2262 * implemented, a request for page 3F may return Sense Key
2263 * 5: Illegal Request, Sense Code 24: Invalid field in
2266 if (!scsi_status_is_good(res
))
2267 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2270 * Third attempt: ask 255 bytes, as we did earlier.
2272 if (!scsi_status_is_good(res
))
2273 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2277 if (!scsi_status_is_good(res
)) {
2278 sd_printk(KERN_WARNING
, sdkp
,
2279 "Test WP failed, assume Write Enabled\n");
2281 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2282 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2283 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2284 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2285 sdkp
->write_prot
? "on" : "off");
2286 sd_printk(KERN_DEBUG
, sdkp
,
2287 "Mode Sense: %02x %02x %02x %02x\n",
2288 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2294 * sd_read_cache_type - called only from sd_revalidate_disk()
2295 * called with buffer of length SD_BUF_SIZE
2298 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2301 struct scsi_device
*sdp
= sdkp
->device
;
2306 struct scsi_mode_data data
;
2307 struct scsi_sense_hdr sshdr
;
2308 int old_wce
= sdkp
->WCE
;
2309 int old_rcd
= sdkp
->RCD
;
2310 int old_dpofua
= sdkp
->DPOFUA
;
2313 if (sdp
->skip_ms_page_8
) {
2314 if (sdp
->type
== TYPE_RBC
)
2317 if (sdp
->skip_ms_page_3f
)
2320 if (sdp
->use_192_bytes_for_3f
)
2324 } else if (sdp
->type
== TYPE_RBC
) {
2332 /* cautiously ask */
2333 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2336 if (!scsi_status_is_good(res
))
2339 if (!data
.header_length
) {
2342 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2345 /* that went OK, now ask for the proper length */
2349 * We're only interested in the first three bytes, actually.
2350 * But the data cache page is defined for the first 20.
2354 else if (len
> SD_BUF_SIZE
) {
2355 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2356 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2359 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2363 if (len
> first_len
)
2364 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2367 if (scsi_status_is_good(res
)) {
2368 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2370 while (offset
< len
) {
2371 u8 page_code
= buffer
[offset
] & 0x3F;
2372 u8 spf
= buffer
[offset
] & 0x40;
2374 if (page_code
== 8 || page_code
== 6) {
2375 /* We're interested only in the first 3 bytes.
2377 if (len
- offset
<= 2) {
2378 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2379 "mode parameter data\n");
2382 modepage
= page_code
;
2386 /* Go to the next page */
2387 if (spf
&& len
- offset
> 3)
2388 offset
+= 4 + (buffer
[offset
+2] << 8) +
2390 else if (!spf
&& len
- offset
> 1)
2391 offset
+= 2 + buffer
[offset
+1];
2393 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2394 "mode parameter data\n");
2400 if (modepage
== 0x3F) {
2401 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page "
2404 } else if ((buffer
[offset
] & 0x3f) != modepage
) {
2405 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
2409 if (modepage
== 8) {
2410 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2411 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2413 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2417 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2418 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2419 sd_printk(KERN_NOTICE
, sdkp
,
2420 "Uses READ/WRITE(6), disabling FUA\n");
2424 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2425 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2426 sd_printk(KERN_NOTICE
, sdkp
,
2427 "Write cache: %s, read cache: %s, %s\n",
2428 sdkp
->WCE
? "enabled" : "disabled",
2429 sdkp
->RCD
? "disabled" : "enabled",
2430 sdkp
->DPOFUA
? "supports DPO and FUA"
2431 : "doesn't support DPO or FUA");
2437 if (scsi_sense_valid(&sshdr
) &&
2438 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2439 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2440 /* Invalid field in CDB */
2441 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2443 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2446 if (sdp
->wce_default_on
) {
2447 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2450 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2458 * The ATO bit indicates whether the DIF application tag is available
2459 * for use by the operating system.
2461 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2464 struct scsi_device
*sdp
= sdkp
->device
;
2465 struct scsi_mode_data data
;
2466 struct scsi_sense_hdr sshdr
;
2468 if (sdp
->type
!= TYPE_DISK
)
2471 if (sdkp
->protection_type
== 0)
2474 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2475 SD_MAX_RETRIES
, &data
, &sshdr
);
2477 if (!scsi_status_is_good(res
) || !data
.header_length
||
2479 sd_printk(KERN_WARNING
, sdkp
,
2480 "getting Control mode page failed, assume no ATO\n");
2482 if (scsi_sense_valid(&sshdr
))
2483 sd_print_sense_hdr(sdkp
, &sshdr
);
2488 offset
= data
.header_length
+ data
.block_descriptor_length
;
2490 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2491 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2495 if ((buffer
[offset
+ 5] & 0x80) == 0)
2504 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2505 * @disk: disk to query
2507 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2509 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2510 const int vpd_len
= 64;
2511 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2514 /* Block Limits VPD */
2515 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2518 blk_queue_io_min(sdkp
->disk
->queue
,
2519 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2520 blk_queue_io_opt(sdkp
->disk
->queue
,
2521 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2523 if (buffer
[3] == 0x3c) {
2524 unsigned int lba_count
, desc_count
;
2526 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2531 lba_count
= get_unaligned_be32(&buffer
[20]);
2532 desc_count
= get_unaligned_be32(&buffer
[24]);
2534 if (lba_count
&& desc_count
)
2535 sdkp
->max_unmap_blocks
= lba_count
;
2537 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2539 if (buffer
[32] & 0x80)
2540 sdkp
->unmap_alignment
=
2541 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2543 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2545 if (sdkp
->max_unmap_blocks
)
2546 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2548 sd_config_discard(sdkp
, SD_LBP_WS16
);
2550 } else { /* LBP VPD page tells us what to use */
2552 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2553 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2554 else if (sdkp
->lbpws
)
2555 sd_config_discard(sdkp
, SD_LBP_WS16
);
2556 else if (sdkp
->lbpws10
)
2557 sd_config_discard(sdkp
, SD_LBP_WS10
);
2559 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2568 * sd_read_block_characteristics - Query block dev. characteristics
2569 * @disk: disk to query
2571 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2573 unsigned char *buffer
;
2575 const int vpd_len
= 64;
2577 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2580 /* Block Device Characteristics VPD */
2581 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2584 rot
= get_unaligned_be16(&buffer
[4]);
2587 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2594 * sd_read_block_provisioning - Query provisioning VPD page
2595 * @disk: disk to query
2597 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2599 unsigned char *buffer
;
2600 const int vpd_len
= 8;
2602 if (sdkp
->lbpme
== 0)
2605 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2607 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2611 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2612 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2613 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2619 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2621 if (scsi_report_opcode(sdkp
->device
, buffer
, SD_BUF_SIZE
,
2626 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2629 * Although VPD inquiries can go to SCSI-2 type devices,
2630 * some USB ones crash on receiving them, and the pages
2631 * we currently ask for are for SPC-3 and beyond
2633 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2639 * sd_revalidate_disk - called the first time a new disk is seen,
2640 * performs disk spin up, read_capacity, etc.
2641 * @disk: struct gendisk we care about
2643 static int sd_revalidate_disk(struct gendisk
*disk
)
2645 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2646 struct scsi_device
*sdp
= sdkp
->device
;
2647 unsigned char *buffer
;
2650 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2651 "sd_revalidate_disk\n"));
2654 * If the device is offline, don't try and read capacity or any
2655 * of the other niceties.
2657 if (!scsi_device_online(sdp
))
2660 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2662 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2663 "allocation failure.\n");
2667 sd_spinup_disk(sdkp
);
2670 * Without media there is no reason to ask; moreover, some devices
2671 * react badly if we do.
2673 if (sdkp
->media_present
) {
2674 sd_read_capacity(sdkp
, buffer
);
2676 if (sd_try_extended_inquiry(sdp
)) {
2677 sd_read_block_provisioning(sdkp
);
2678 sd_read_block_limits(sdkp
);
2679 sd_read_block_characteristics(sdkp
);
2682 sd_read_write_protect_flag(sdkp
, buffer
);
2683 sd_read_cache_type(sdkp
, buffer
);
2684 sd_read_app_tag_own(sdkp
, buffer
);
2685 sd_read_write_same(sdkp
, buffer
);
2688 sdkp
->first_scan
= 0;
2691 * We now have all cache related info, determine how we deal
2692 * with flush requests.
2700 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2702 set_capacity(disk
, sdkp
->capacity
);
2703 sd_config_write_same(sdkp
);
2711 * sd_unlock_native_capacity - unlock native capacity
2712 * @disk: struct gendisk to set capacity for
2714 * Block layer calls this function if it detects that partitions
2715 * on @disk reach beyond the end of the device. If the SCSI host
2716 * implements ->unlock_native_capacity() method, it's invoked to
2717 * give it a chance to adjust the device capacity.
2720 * Defined by block layer. Might sleep.
2722 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2724 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2726 if (sdev
->host
->hostt
->unlock_native_capacity
)
2727 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2731 * sd_format_disk_name - format disk name
2732 * @prefix: name prefix - ie. "sd" for SCSI disks
2733 * @index: index of the disk to format name for
2734 * @buf: output buffer
2735 * @buflen: length of the output buffer
2737 * SCSI disk names starts at sda. The 26th device is sdz and the
2738 * 27th is sdaa. The last one for two lettered suffix is sdzz
2739 * which is followed by sdaaa.
2741 * This is basically 26 base counting with one extra 'nil' entry
2742 * at the beginning from the second digit on and can be
2743 * determined using similar method as 26 base conversion with the
2744 * index shifted -1 after each digit is computed.
2750 * 0 on success, -errno on failure.
2752 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2754 const int base
= 'z' - 'a' + 1;
2755 char *begin
= buf
+ strlen(prefix
);
2756 char *end
= buf
+ buflen
;
2766 *--p
= 'a' + (index
% unit
);
2767 index
= (index
/ unit
) - 1;
2768 } while (index
>= 0);
2770 memmove(begin
, p
, end
- p
);
2771 memcpy(buf
, prefix
, strlen(prefix
));
2777 * The asynchronous part of sd_probe
2779 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2781 struct scsi_disk
*sdkp
= data
;
2782 struct scsi_device
*sdp
;
2789 index
= sdkp
->index
;
2790 dev
= &sdp
->sdev_gendev
;
2792 gd
->major
= sd_major((index
& 0xf0) >> 4);
2793 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2794 gd
->minors
= SD_MINORS
;
2796 gd
->fops
= &sd_fops
;
2797 gd
->private_data
= &sdkp
->driver
;
2798 gd
->queue
= sdkp
->device
->request_queue
;
2800 /* defaults, until the device tells us otherwise */
2801 sdp
->sector_size
= 512;
2803 sdkp
->media_present
= 1;
2804 sdkp
->write_prot
= 0;
2808 sdkp
->first_scan
= 1;
2809 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2811 sd_revalidate_disk(gd
);
2813 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2814 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2816 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2817 gd
->flags
= GENHD_FL_EXT_DEVT
;
2818 if (sdp
->removable
) {
2819 gd
->flags
|= GENHD_FL_REMOVABLE
;
2820 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2825 sd_dif_config_host(sdkp
);
2827 sd_revalidate_disk(gd
);
2829 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2830 sdp
->removable
? "removable " : "");
2831 scsi_autopm_put_device(sdp
);
2832 put_device(&sdkp
->dev
);
2836 * sd_probe - called during driver initialization and whenever a
2837 * new scsi device is attached to the system. It is called once
2838 * for each scsi device (not just disks) present.
2839 * @dev: pointer to device object
2841 * Returns 0 if successful (or not interested in this scsi device
2842 * (e.g. scanner)); 1 when there is an error.
2844 * Note: this function is invoked from the scsi mid-level.
2845 * This function sets up the mapping between a given
2846 * <host,channel,id,lun> (found in sdp) and new device name
2847 * (e.g. /dev/sda). More precisely it is the block device major
2848 * and minor number that is chosen here.
2850 * Assume sd_probe is not re-entrant (for time being)
2851 * Also think about sd_probe() and sd_remove() running coincidentally.
2853 static int sd_probe(struct device
*dev
)
2855 struct scsi_device
*sdp
= to_scsi_device(dev
);
2856 struct scsi_disk
*sdkp
;
2862 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2865 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2869 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2873 gd
= alloc_disk(SD_MINORS
);
2878 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2881 spin_lock(&sd_index_lock
);
2882 error
= ida_get_new(&sd_index_ida
, &index
);
2883 spin_unlock(&sd_index_lock
);
2884 } while (error
== -EAGAIN
);
2887 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2891 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2893 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2894 goto out_free_index
;
2898 sdkp
->driver
= &sd_template
;
2900 sdkp
->index
= index
;
2901 atomic_set(&sdkp
->openers
, 0);
2902 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2904 if (!sdp
->request_queue
->rq_timeout
) {
2905 if (sdp
->type
!= TYPE_MOD
)
2906 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2908 blk_queue_rq_timeout(sdp
->request_queue
,
2912 device_initialize(&sdkp
->dev
);
2913 sdkp
->dev
.parent
= dev
;
2914 sdkp
->dev
.class = &sd_disk_class
;
2915 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2917 if (device_add(&sdkp
->dev
))
2918 goto out_free_index
;
2921 dev_set_drvdata(dev
, sdkp
);
2923 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2924 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2929 spin_lock(&sd_index_lock
);
2930 ida_remove(&sd_index_ida
, index
);
2931 spin_unlock(&sd_index_lock
);
2941 * sd_remove - called whenever a scsi disk (previously recognized by
2942 * sd_probe) is detached from the system. It is called (potentially
2943 * multiple times) during sd module unload.
2944 * @sdp: pointer to mid level scsi device object
2946 * Note: this function is invoked from the scsi mid-level.
2947 * This function potentially frees up a device name (e.g. /dev/sdc)
2948 * that could be re-used by a subsequent sd_probe().
2949 * This function is not called when the built-in sd driver is "exit-ed".
2951 static int sd_remove(struct device
*dev
)
2953 struct scsi_disk
*sdkp
;
2955 sdkp
= dev_get_drvdata(dev
);
2956 scsi_autopm_get_device(sdkp
->device
);
2958 async_synchronize_full_domain(&scsi_sd_probe_domain
);
2959 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2960 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2961 device_del(&sdkp
->dev
);
2962 del_gendisk(sdkp
->disk
);
2965 mutex_lock(&sd_ref_mutex
);
2966 dev_set_drvdata(dev
, NULL
);
2967 put_device(&sdkp
->dev
);
2968 mutex_unlock(&sd_ref_mutex
);
2974 * scsi_disk_release - Called to free the scsi_disk structure
2975 * @dev: pointer to embedded class device
2977 * sd_ref_mutex must be held entering this routine. Because it is
2978 * called on last put, you should always use the scsi_disk_get()
2979 * scsi_disk_put() helpers which manipulate the semaphore directly
2980 * and never do a direct put_device.
2982 static void scsi_disk_release(struct device
*dev
)
2984 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2985 struct gendisk
*disk
= sdkp
->disk
;
2987 spin_lock(&sd_index_lock
);
2988 ida_remove(&sd_index_ida
, sdkp
->index
);
2989 spin_unlock(&sd_index_lock
);
2991 disk
->private_data
= NULL
;
2993 put_device(&sdkp
->device
->sdev_gendev
);
2998 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3000 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3001 struct scsi_sense_hdr sshdr
;
3002 struct scsi_device
*sdp
= sdkp
->device
;
3006 cmd
[4] |= 1; /* START */
3008 if (sdp
->start_stop_pwr_cond
)
3009 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3011 if (!scsi_device_online(sdp
))
3014 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3015 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
3017 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3018 sd_print_result(sdkp
, res
);
3019 if (driver_byte(res
) & DRIVER_SENSE
)
3020 sd_print_sense_hdr(sdkp
, &sshdr
);
3027 * Send a SYNCHRONIZE CACHE instruction down to the device through
3028 * the normal SCSI command structure. Wait for the command to
3031 static void sd_shutdown(struct device
*dev
)
3033 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3036 return; /* this can happen */
3038 if (pm_runtime_suspended(dev
))
3042 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3043 sd_sync_cache(sdkp
);
3046 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3047 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3048 sd_start_stop_device(sdkp
, 0);
3052 scsi_disk_put(sdkp
);
3055 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
3057 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3061 return 0; /* this can happen */
3064 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3065 ret
= sd_sync_cache(sdkp
);
3070 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
3071 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3072 ret
= sd_start_stop_device(sdkp
, 0);
3076 scsi_disk_put(sdkp
);
3080 static int sd_resume(struct device
*dev
)
3082 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3085 if (!sdkp
->device
->manage_start_stop
)
3088 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3089 ret
= sd_start_stop_device(sdkp
, 1);
3092 scsi_disk_put(sdkp
);
3097 * init_sd - entry point for this driver (both when built in or when
3100 * Note: this function registers this driver with the scsi mid-level.
3102 static int __init
init_sd(void)
3104 int majors
= 0, i
, err
;
3106 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3108 for (i
= 0; i
< SD_MAJORS
; i
++)
3109 if (register_blkdev(sd_major(i
), "sd") == 0)
3115 err
= class_register(&sd_disk_class
);
3119 err
= scsi_register_driver(&sd_template
.gendrv
);
3123 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3125 if (!sd_cdb_cache
) {
3126 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3130 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3132 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3139 kmem_cache_destroy(sd_cdb_cache
);
3142 class_unregister(&sd_disk_class
);
3144 for (i
= 0; i
< SD_MAJORS
; i
++)
3145 unregister_blkdev(sd_major(i
), "sd");
3150 * exit_sd - exit point for this driver (when it is a module).
3152 * Note: this function unregisters this driver from the scsi mid-level.
3154 static void __exit
exit_sd(void)
3158 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3160 mempool_destroy(sd_cdb_pool
);
3161 kmem_cache_destroy(sd_cdb_cache
);
3163 scsi_unregister_driver(&sd_template
.gendrv
);
3164 class_unregister(&sd_disk_class
);
3166 for (i
= 0; i
< SD_MAJORS
; i
++)
3167 unregister_blkdev(sd_major(i
), "sd");
3170 module_init(init_sd
);
3171 module_exit(exit_sd
);
3173 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3174 struct scsi_sense_hdr
*sshdr
)
3176 sd_printk(KERN_INFO
, sdkp
, " ");
3177 scsi_show_sense_hdr(sshdr
);
3178 sd_printk(KERN_INFO
, sdkp
, " ");
3179 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3182 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3184 sd_printk(KERN_INFO
, sdkp
, " ");
3185 scsi_show_result(result
);