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 <asm/uaccess.h>
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_eh.h>
60 #include <scsi/scsi_host.h>
61 #include <scsi/scsi_ioctl.h>
62 #include <scsi/scsicam.h>
65 #include "scsi_logging.h"
67 MODULE_AUTHOR("Eric Youngdale");
68 MODULE_DESCRIPTION("SCSI disk (sd) driver");
69 MODULE_LICENSE("GPL");
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
91 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
97 static int sd_revalidate_disk(struct gendisk
*);
98 static int sd_probe(struct device
*);
99 static int sd_remove(struct device
*);
100 static void sd_shutdown(struct device
*);
101 static int sd_suspend(struct device
*, pm_message_t state
);
102 static int sd_resume(struct device
*);
103 static void sd_rescan(struct device
*);
104 static int sd_done(struct scsi_cmnd
*);
105 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
106 static void scsi_disk_release(struct device
*cdev
);
107 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
108 static void sd_print_result(struct scsi_disk
*, int);
110 static DEFINE_SPINLOCK(sd_index_lock
);
111 static DEFINE_IDA(sd_index_ida
);
113 /* This semaphore is used to mediate the 0->1 reference get in the
114 * face of object destruction (i.e. we can't allow a get on an
115 * object after last put) */
116 static DEFINE_MUTEX(sd_ref_mutex
);
118 static const char *sd_cache_types
[] = {
119 "write through", "none", "write back",
120 "write back, no read (daft)"
124 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
125 const char *buf
, size_t count
)
127 int i
, ct
= -1, rcd
, wce
, sp
;
128 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
129 struct scsi_device
*sdp
= sdkp
->device
;
132 struct scsi_mode_data data
;
133 struct scsi_sense_hdr sshdr
;
136 if (sdp
->type
!= TYPE_DISK
)
137 /* no cache control on RBC devices; theoretically they
138 * can do it, but there's probably so many exceptions
139 * it's not worth the risk */
142 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
143 const int len
= strlen(sd_cache_types
[i
]);
144 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
152 rcd
= ct
& 0x01 ? 1 : 0;
153 wce
= ct
& 0x02 ? 1 : 0;
154 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
155 SD_MAX_RETRIES
, &data
, NULL
))
157 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
158 data
.block_descriptor_length
);
159 buffer_data
= buffer
+ data
.header_length
+
160 data
.block_descriptor_length
;
161 buffer_data
[2] &= ~0x05;
162 buffer_data
[2] |= wce
<< 2 | rcd
;
163 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
165 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
166 SD_MAX_RETRIES
, &data
, &sshdr
)) {
167 if (scsi_sense_valid(&sshdr
))
168 sd_print_sense_hdr(sdkp
, &sshdr
);
171 revalidate_disk(sdkp
->disk
);
176 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
177 const char *buf
, size_t count
)
179 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
180 struct scsi_device
*sdp
= sdkp
->device
;
182 if (!capable(CAP_SYS_ADMIN
))
185 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
191 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
192 const char *buf
, size_t count
)
194 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
195 struct scsi_device
*sdp
= sdkp
->device
;
197 if (!capable(CAP_SYS_ADMIN
))
200 if (sdp
->type
!= TYPE_DISK
)
203 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
209 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
212 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
213 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
215 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
219 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
221 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
223 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
227 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
230 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
231 struct scsi_device
*sdp
= sdkp
->device
;
233 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
237 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
240 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
242 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
246 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
249 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
251 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
255 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
258 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
260 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
263 static struct device_attribute sd_disk_attrs
[] = {
264 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
265 sd_store_cache_type
),
266 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
267 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
268 sd_store_allow_restart
),
269 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
270 sd_store_manage_start_stop
),
271 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
272 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
276 static struct class sd_disk_class
= {
278 .owner
= THIS_MODULE
,
279 .dev_release
= scsi_disk_release
,
280 .dev_attrs
= sd_disk_attrs
,
283 static struct scsi_driver sd_template
= {
284 .owner
= THIS_MODULE
,
289 .suspend
= sd_suspend
,
291 .shutdown
= sd_shutdown
,
298 * Device no to disk mapping:
300 * major disc2 disc p1
301 * |............|.............|....|....| <- dev_t
304 * Inside a major, we have 16k disks, however mapped non-
305 * contiguously. The first 16 disks are for major0, the next
306 * ones with major1, ... Disk 256 is for major0 again, disk 272
308 * As we stay compatible with our numbering scheme, we can reuse
309 * the well-know SCSI majors 8, 65--71, 136--143.
311 static int sd_major(int major_idx
)
315 return SCSI_DISK0_MAJOR
;
317 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
319 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
322 return 0; /* shut up gcc */
326 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
328 struct scsi_disk
*sdkp
= NULL
;
330 if (disk
->private_data
) {
331 sdkp
= scsi_disk(disk
);
332 if (scsi_device_get(sdkp
->device
) == 0)
333 get_device(&sdkp
->dev
);
340 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
342 struct scsi_disk
*sdkp
;
344 mutex_lock(&sd_ref_mutex
);
345 sdkp
= __scsi_disk_get(disk
);
346 mutex_unlock(&sd_ref_mutex
);
350 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
352 struct scsi_disk
*sdkp
;
354 mutex_lock(&sd_ref_mutex
);
355 sdkp
= dev_get_drvdata(dev
);
357 sdkp
= __scsi_disk_get(sdkp
->disk
);
358 mutex_unlock(&sd_ref_mutex
);
362 static void scsi_disk_put(struct scsi_disk
*sdkp
)
364 struct scsi_device
*sdev
= sdkp
->device
;
366 mutex_lock(&sd_ref_mutex
);
367 put_device(&sdkp
->dev
);
368 scsi_device_put(sdev
);
369 mutex_unlock(&sd_ref_mutex
);
373 * sd_init_command - build a scsi (read or write) command from
374 * information in the request structure.
375 * @SCpnt: pointer to mid-level's per scsi command structure that
376 * contains request and into which the scsi command is written
378 * Returns 1 if successful and 0 if error (or cannot be done now).
380 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
382 struct scsi_cmnd
*SCpnt
;
383 struct scsi_device
*sdp
= q
->queuedata
;
384 struct gendisk
*disk
= rq
->rq_disk
;
385 struct scsi_disk
*sdkp
;
386 sector_t block
= rq
->sector
;
388 unsigned int this_count
= rq
->nr_sectors
;
391 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
392 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
394 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
398 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
399 if (ret
!= BLKPREP_OK
)
402 sdkp
= scsi_disk(disk
);
404 /* from here on until we're complete, any goto out
405 * is used for a killable error condition */
408 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
409 "sd_init_command: block=%llu, "
411 (unsigned long long)block
,
414 if (!sdp
|| !scsi_device_online(sdp
) ||
415 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
416 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
417 "Finishing %ld sectors\n",
419 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
420 "Retry with 0x%p\n", SCpnt
));
426 * quietly refuse to do anything to a changed disc until
427 * the changed bit has been reset
429 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
434 * Some SD card readers can't handle multi-sector accesses which touch
435 * the last one or two hardware sectors. Split accesses as needed.
437 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
438 (sdp
->sector_size
/ 512);
440 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
441 if (block
< threshold
) {
442 /* Access up to the threshold but not beyond */
443 this_count
= threshold
- block
;
445 /* Access only a single hardware sector */
446 this_count
= sdp
->sector_size
/ 512;
450 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
451 (unsigned long long)block
));
454 * If we have a 1K hardware sectorsize, prevent access to single
455 * 512 byte sectors. In theory we could handle this - in fact
456 * the scsi cdrom driver must be able to handle this because
457 * we typically use 1K blocksizes, and cdroms typically have
458 * 2K hardware sectorsizes. Of course, things are simpler
459 * with the cdrom, since it is read-only. For performance
460 * reasons, the filesystems should be able to handle this
461 * and not force the scsi disk driver to use bounce buffers
464 if (sdp
->sector_size
== 1024) {
465 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
466 scmd_printk(KERN_ERR
, SCpnt
,
467 "Bad block number requested\n");
471 this_count
= this_count
>> 1;
474 if (sdp
->sector_size
== 2048) {
475 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
476 scmd_printk(KERN_ERR
, SCpnt
,
477 "Bad block number requested\n");
481 this_count
= this_count
>> 2;
484 if (sdp
->sector_size
== 4096) {
485 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
486 scmd_printk(KERN_ERR
, SCpnt
,
487 "Bad block number requested\n");
491 this_count
= this_count
>> 3;
494 if (rq_data_dir(rq
) == WRITE
) {
495 if (!sdp
->writeable
) {
498 SCpnt
->cmnd
[0] = WRITE_6
;
499 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
501 if (blk_integrity_rq(rq
) &&
502 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
505 } else if (rq_data_dir(rq
) == READ
) {
506 SCpnt
->cmnd
[0] = READ_6
;
507 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
509 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
513 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
514 "%s %d/%ld 512 byte blocks.\n",
515 (rq_data_dir(rq
) == WRITE
) ?
516 "writing" : "reading", this_count
,
519 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
520 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
522 SCpnt
->cmnd
[1] = 1 << 5;
526 if (block
> 0xffffffff) {
527 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
528 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
529 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
530 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
531 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
532 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
533 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
534 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
535 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
536 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
537 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
538 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
539 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
540 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
541 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
542 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
543 scsi_device_protection(SCpnt
->device
) ||
544 SCpnt
->device
->use_10_for_rw
) {
545 if (this_count
> 0xffff)
548 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
549 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
550 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
551 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
552 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
553 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
554 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
555 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
556 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
558 if (unlikely(blk_fua_rq(rq
))) {
560 * This happens only if this drive failed
561 * 10byte rw command with ILLEGAL_REQUEST
562 * during operation and thus turned off
565 scmd_printk(KERN_ERR
, SCpnt
,
566 "FUA write on READ/WRITE(6) drive\n");
570 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
571 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
572 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
573 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
576 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
578 /* If DIF or DIX is enabled, tell HBA how to handle request */
579 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
580 sd_dif_op(SCpnt
, host_dif
, scsi_prot_sg_count(SCpnt
),
581 sdkp
->protection_type
);
584 * We shouldn't disconnect in the middle of a sector, so with a dumb
585 * host adapter, it's safe to assume that we can at least transfer
586 * this many bytes between each connect / disconnect.
588 SCpnt
->transfersize
= sdp
->sector_size
;
589 SCpnt
->underflow
= this_count
<< 9;
590 SCpnt
->allowed
= SD_MAX_RETRIES
;
593 * This indicates that the command is ready from our end to be
598 return scsi_prep_return(q
, rq
, ret
);
602 * sd_open - open a scsi disk device
603 * @inode: only i_rdev member may be used
604 * @filp: only f_mode and f_flags may be used
606 * Returns 0 if successful. Returns a negated errno value in case
609 * Note: This can be called from a user context (e.g. fsck(1) )
610 * or from within the kernel (e.g. as a result of a mount(1) ).
611 * In the latter case @inode and @filp carry an abridged amount
612 * of information as noted above.
614 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
616 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
617 struct scsi_device
*sdev
;
623 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
628 * If the device is in error recovery, wait until it is done.
629 * If the device is offline, then disallow any access to it.
632 if (!scsi_block_when_processing_errors(sdev
))
635 if (sdev
->removable
|| sdkp
->write_prot
)
636 check_disk_change(bdev
);
639 * If the drive is empty, just let the open fail.
642 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
646 * If the device has the write protect tab set, have the open fail
647 * if the user expects to be able to write to the thing.
650 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
654 * It is possible that the disk changing stuff resulted in
655 * the device being taken offline. If this is the case,
656 * report this to the user, and don't pretend that the
657 * open actually succeeded.
660 if (!scsi_device_online(sdev
))
663 if (!sdkp
->openers
++ && sdev
->removable
) {
664 if (scsi_block_when_processing_errors(sdev
))
665 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
676 * sd_release - invoked when the (last) close(2) is called on this
678 * @inode: only i_rdev member may be used
679 * @filp: only f_mode and f_flags may be used
683 * Note: may block (uninterruptible) if error recovery is underway
686 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
688 struct scsi_disk
*sdkp
= scsi_disk(disk
);
689 struct scsi_device
*sdev
= sdkp
->device
;
691 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
693 if (!--sdkp
->openers
&& sdev
->removable
) {
694 if (scsi_block_when_processing_errors(sdev
))
695 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
699 * XXX and what if there are packets in flight and this close()
700 * XXX is followed by a "rmmod sd_mod"?
706 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
708 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
709 struct scsi_device
*sdp
= sdkp
->device
;
710 struct Scsi_Host
*host
= sdp
->host
;
713 /* default to most commonly used values */
714 diskinfo
[0] = 0x40; /* 1 << 6 */
715 diskinfo
[1] = 0x20; /* 1 << 5 */
716 diskinfo
[2] = sdkp
->capacity
>> 11;
718 /* override with calculated, extended default, or driver values */
719 if (host
->hostt
->bios_param
)
720 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
722 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
724 geo
->heads
= diskinfo
[0];
725 geo
->sectors
= diskinfo
[1];
726 geo
->cylinders
= diskinfo
[2];
731 * sd_ioctl - process an ioctl
732 * @inode: only i_rdev/i_bdev members may be used
733 * @filp: only f_mode and f_flags may be used
734 * @cmd: ioctl command number
735 * @arg: this is third argument given to ioctl(2) system call.
736 * Often contains a pointer.
738 * Returns 0 if successful (some ioctls return postive numbers on
739 * success as well). Returns a negated errno value in case of error.
741 * Note: most ioctls are forward onto the block subsystem or further
742 * down in the scsi subsystem.
744 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
745 unsigned int cmd
, unsigned long arg
)
747 struct gendisk
*disk
= bdev
->bd_disk
;
748 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
749 void __user
*p
= (void __user
*)arg
;
752 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
753 disk
->disk_name
, cmd
));
756 * If we are in the middle of error recovery, don't let anyone
757 * else try and use this device. Also, if error recovery fails, it
758 * may try and take the device offline, in which case all further
759 * access to the device is prohibited.
761 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
762 (mode
& FMODE_NDELAY
) != 0);
763 if (!scsi_block_when_processing_errors(sdp
) || !error
)
767 * Send SCSI addressing ioctls directly to mid level, send other
768 * ioctls to block level and then onto mid level if they can't be
772 case SCSI_IOCTL_GET_IDLUN
:
773 case SCSI_IOCTL_GET_BUS_NUMBER
:
774 return scsi_ioctl(sdp
, cmd
, p
);
776 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
777 if (error
!= -ENOTTY
)
780 return scsi_ioctl(sdp
, cmd
, p
);
783 static void set_media_not_present(struct scsi_disk
*sdkp
)
785 sdkp
->media_present
= 0;
787 sdkp
->device
->changed
= 1;
791 * sd_media_changed - check if our medium changed
792 * @disk: kernel device descriptor
794 * Returns 0 if not applicable or no change; 1 if change
796 * Note: this function is invoked from the block subsystem.
798 static int sd_media_changed(struct gendisk
*disk
)
800 struct scsi_disk
*sdkp
= scsi_disk(disk
);
801 struct scsi_device
*sdp
= sdkp
->device
;
802 struct scsi_sense_hdr
*sshdr
= NULL
;
805 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
811 * If the device is offline, don't send any commands - just pretend as
812 * if the command failed. If the device ever comes back online, we
813 * can deal with it then. It is only because of unrecoverable errors
814 * that we would ever take a device offline in the first place.
816 if (!scsi_device_online(sdp
)) {
817 set_media_not_present(sdkp
);
823 * Using TEST_UNIT_READY enables differentiation between drive with
824 * no cartridge loaded - NOT READY, drive with changed cartridge -
825 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
827 * Drives that auto spin down. eg iomega jaz 1G, will be started
828 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
829 * sd_revalidate() is called.
833 if (scsi_block_when_processing_errors(sdp
)) {
834 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
835 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
840 * Unable to test, unit probably not ready. This usually
841 * means there is no disc in the drive. Mark as changed,
842 * and we will figure it out later once the drive is
845 if (retval
|| (scsi_sense_valid(sshdr
) &&
846 /* 0x3a is medium not present */
847 sshdr
->asc
== 0x3a)) {
848 set_media_not_present(sdkp
);
854 * For removable scsi disk we have to recognise the presence
855 * of a disk in the drive. This is kept in the struct scsi_disk
856 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
858 sdkp
->media_present
= 1;
860 retval
= sdp
->changed
;
863 if (retval
!= sdkp
->previous_state
)
864 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
865 sdkp
->previous_state
= retval
;
870 static int sd_sync_cache(struct scsi_disk
*sdkp
)
873 struct scsi_device
*sdp
= sdkp
->device
;
874 struct scsi_sense_hdr sshdr
;
876 if (!scsi_device_online(sdp
))
880 for (retries
= 3; retries
> 0; --retries
) {
881 unsigned char cmd
[10] = { 0 };
883 cmd
[0] = SYNCHRONIZE_CACHE
;
885 * Leave the rest of the command zero to indicate
888 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
889 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
895 sd_print_result(sdkp
, res
);
896 if (driver_byte(res
) & DRIVER_SENSE
)
897 sd_print_sense_hdr(sdkp
, &sshdr
);
905 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
907 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
908 rq
->timeout
= SD_TIMEOUT
;
909 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
913 static void sd_rescan(struct device
*dev
)
915 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
918 revalidate_disk(sdkp
->disk
);
926 * This gets directly called from VFS. When the ioctl
927 * is not recognized we go back to the other translation paths.
929 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
930 unsigned int cmd
, unsigned long arg
)
932 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
935 * If we are in the middle of error recovery, don't let anyone
936 * else try and use this device. Also, if error recovery fails, it
937 * may try and take the device offline, in which case all further
938 * access to the device is prohibited.
940 if (!scsi_block_when_processing_errors(sdev
))
943 if (sdev
->host
->hostt
->compat_ioctl
) {
946 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
952 * Let the static ioctl translation table take care of it.
958 static struct block_device_operations sd_fops
= {
959 .owner
= THIS_MODULE
,
961 .release
= sd_release
,
962 .locked_ioctl
= sd_ioctl
,
965 .compat_ioctl
= sd_compat_ioctl
,
967 .media_changed
= sd_media_changed
,
968 .revalidate_disk
= sd_revalidate_disk
,
971 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
973 u64 start_lba
= scmd
->request
->sector
;
974 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
978 if (!blk_fs_request(scmd
->request
))
981 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
982 SCSI_SENSE_BUFFERSIZE
,
987 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
990 if (scmd
->device
->sector_size
< 512) {
991 /* only legitimate sector_size here is 256 */
995 /* be careful ... don't want any overflows */
996 u64 factor
= scmd
->device
->sector_size
/ 512;
997 do_div(start_lba
, factor
);
998 do_div(end_lba
, factor
);
1001 /* The bad lba was reported incorrectly, we have no idea where
1004 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1007 /* This computation should always be done in terms of
1008 * the resolution of the device's medium.
1010 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1014 * sd_done - bottom half handler: called when the lower level
1015 * driver has completed (successfully or otherwise) a scsi command.
1016 * @SCpnt: mid-level's per command structure.
1018 * Note: potentially run from within an ISR. Must not block.
1020 static int sd_done(struct scsi_cmnd
*SCpnt
)
1022 int result
= SCpnt
->result
;
1023 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1024 struct scsi_sense_hdr sshdr
;
1025 int sense_valid
= 0;
1026 int sense_deferred
= 0;
1029 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1031 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1033 #ifdef CONFIG_SCSI_LOGGING
1034 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1036 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1037 "sd_done: sb[respc,sk,asc,"
1038 "ascq]=%x,%x,%x,%x\n",
1039 sshdr
.response_code
,
1040 sshdr
.sense_key
, sshdr
.asc
,
1044 if (driver_byte(result
) != DRIVER_SENSE
&&
1045 (!sense_valid
|| sense_deferred
))
1048 switch (sshdr
.sense_key
) {
1049 case HARDWARE_ERROR
:
1051 good_bytes
= sd_completed_bytes(SCpnt
);
1053 case RECOVERED_ERROR
:
1054 /* Inform the user, but make sure that it's not treated
1057 scsi_print_sense("sd", SCpnt
);
1059 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1060 good_bytes
= scsi_bufflen(SCpnt
);
1063 /* This indicates a false check condition, so ignore it. An
1064 * unknown amount of data was transferred so treat it as an
1067 scsi_print_sense("sd", SCpnt
);
1069 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1071 case ABORTED_COMMAND
:
1072 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1073 scsi_print_result(SCpnt
);
1074 scsi_print_sense("sd", SCpnt
);
1075 good_bytes
= sd_completed_bytes(SCpnt
);
1078 case ILLEGAL_REQUEST
:
1079 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1080 scsi_print_result(SCpnt
);
1081 scsi_print_sense("sd", SCpnt
);
1082 good_bytes
= sd_completed_bytes(SCpnt
);
1089 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1090 sd_dif_complete(SCpnt
, good_bytes
);
1095 static int media_not_present(struct scsi_disk
*sdkp
,
1096 struct scsi_sense_hdr
*sshdr
)
1099 if (!scsi_sense_valid(sshdr
))
1101 /* not invoked for commands that could return deferred errors */
1102 if (sshdr
->sense_key
!= NOT_READY
&&
1103 sshdr
->sense_key
!= UNIT_ATTENTION
)
1105 if (sshdr
->asc
!= 0x3A) /* medium not present */
1108 set_media_not_present(sdkp
);
1113 * spinup disk - called only in sd_revalidate_disk()
1116 sd_spinup_disk(struct scsi_disk
*sdkp
)
1118 unsigned char cmd
[10];
1119 unsigned long spintime_expire
= 0;
1120 int retries
, spintime
;
1121 unsigned int the_result
;
1122 struct scsi_sense_hdr sshdr
;
1123 int sense_valid
= 0;
1127 /* Spin up drives, as required. Only do this at boot time */
1128 /* Spinup needs to be done for module loads too. */
1133 cmd
[0] = TEST_UNIT_READY
;
1134 memset((void *) &cmd
[1], 0, 9);
1136 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1139 SD_MAX_RETRIES
, NULL
);
1142 * If the drive has indicated to us that it
1143 * doesn't have any media in it, don't bother
1144 * with any more polling.
1146 if (media_not_present(sdkp
, &sshdr
))
1150 sense_valid
= scsi_sense_valid(&sshdr
);
1152 } while (retries
< 3 &&
1153 (!scsi_status_is_good(the_result
) ||
1154 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1155 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1157 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1158 /* no sense, TUR either succeeded or failed
1159 * with a status error */
1160 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1161 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1162 sd_print_result(sdkp
, the_result
);
1168 * The device does not want the automatic start to be issued.
1170 if (sdkp
->device
->no_start_on_add
) {
1175 * If manual intervention is required, or this is an
1176 * absent USB storage device, a spinup is meaningless.
1179 sshdr
.sense_key
== NOT_READY
&&
1180 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1181 break; /* manual intervention required */
1184 * Issue command to spin up drive when not ready
1186 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1188 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1189 cmd
[0] = START_STOP
;
1190 cmd
[1] = 1; /* Return immediately */
1191 memset((void *) &cmd
[2], 0, 8);
1192 cmd
[4] = 1; /* Start spin cycle */
1193 if (sdkp
->device
->start_stop_pwr_cond
)
1195 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1197 SD_TIMEOUT
, SD_MAX_RETRIES
,
1199 spintime_expire
= jiffies
+ 100 * HZ
;
1202 /* Wait 1 second for next try */
1207 * Wait for USB flash devices with slow firmware.
1208 * Yes, this sense key/ASC combination shouldn't
1209 * occur here. It's characteristic of these devices.
1211 } else if (sense_valid
&&
1212 sshdr
.sense_key
== UNIT_ATTENTION
&&
1213 sshdr
.asc
== 0x28) {
1215 spintime_expire
= jiffies
+ 5 * HZ
;
1218 /* Wait 1 second for next try */
1221 /* we don't understand the sense code, so it's
1222 * probably pointless to loop */
1224 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1225 sd_print_sense_hdr(sdkp
, &sshdr
);
1230 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1233 if (scsi_status_is_good(the_result
))
1236 printk("not responding...\n");
1242 * Determine whether disk supports Data Integrity Field.
1244 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1246 struct scsi_device
*sdp
= sdkp
->device
;
1249 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1252 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1254 sdkp
->protection_type
= type
;
1257 case SD_DIF_TYPE0_PROTECTION
:
1258 case SD_DIF_TYPE1_PROTECTION
:
1259 case SD_DIF_TYPE3_PROTECTION
:
1262 case SD_DIF_TYPE2_PROTECTION
:
1263 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1264 "protection which is currently unsupported. " \
1265 "Disabling disk!\n");
1269 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1270 "protection type %d. Disabling disk!\n", type
);
1281 * read disk capacity
1284 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1286 unsigned char cmd
[16];
1287 int the_result
, retries
;
1288 int sector_size
= 0;
1289 /* Force READ CAPACITY(16) when PROTECT=1 */
1290 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1291 struct scsi_sense_hdr sshdr
;
1292 int sense_valid
= 0;
1293 struct scsi_device
*sdp
= sdkp
->device
;
1299 memset((void *) cmd
, 0, 16);
1300 cmd
[0] = SERVICE_ACTION_IN
;
1301 cmd
[1] = SAI_READ_CAPACITY_16
;
1303 memset((void *) buffer
, 0, 13);
1305 cmd
[0] = READ_CAPACITY
;
1306 memset((void *) &cmd
[1], 0, 9);
1307 memset((void *) buffer
, 0, 8);
1310 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1311 buffer
, longrc
? 13 : 8, &sshdr
,
1312 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1314 if (media_not_present(sdkp
, &sshdr
))
1318 sense_valid
= scsi_sense_valid(&sshdr
);
1321 } while (the_result
&& retries
);
1323 if (the_result
&& !longrc
) {
1324 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1325 sd_print_result(sdkp
, the_result
);
1326 if (driver_byte(the_result
) & DRIVER_SENSE
)
1327 sd_print_sense_hdr(sdkp
, &sshdr
);
1329 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1331 /* Set dirty bit for removable devices if not ready -
1332 * sometimes drives will not report this properly. */
1333 if (sdp
->removable
&&
1334 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1337 /* Either no media are present but the drive didn't tell us,
1338 or they are present but the read capacity command fails */
1339 /* sdkp->media_present = 0; -- not always correct */
1340 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1343 } else if (the_result
&& longrc
) {
1344 /* READ CAPACITY(16) has been failed */
1345 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1346 sd_print_result(sdkp
, the_result
);
1347 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1349 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1354 sector_size
= (buffer
[4] << 24) |
1355 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1356 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1357 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1358 if(sizeof(sdkp
->capacity
) > 4) {
1359 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1360 "Trying to use READ CAPACITY(16).\n");
1364 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1365 "a kernel compiled with support for large "
1366 "block devices.\n");
1370 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1375 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1376 ((u64
)buffer
[1] << 48) |
1377 ((u64
)buffer
[2] << 40) |
1378 ((u64
)buffer
[3] << 32) |
1379 ((sector_t
)buffer
[4] << 24) |
1380 ((sector_t
)buffer
[5] << 16) |
1381 ((sector_t
)buffer
[6] << 8) |
1382 (sector_t
)buffer
[7]);
1384 sector_size
= (buffer
[8] << 24) |
1385 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1387 sd_read_protection_type(sdkp
, buffer
);
1390 /* Some devices return the total number of sectors, not the
1391 * highest sector number. Make the necessary adjustment. */
1392 if (sdp
->fix_capacity
) {
1395 /* Some devices have version which report the correct sizes
1396 * and others which do not. We guess size according to a heuristic
1397 * and err on the side of lowering the capacity. */
1399 if (sdp
->guess_capacity
)
1400 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1405 if (sector_size
== 0) {
1407 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1411 if (sector_size
!= 512 &&
1412 sector_size
!= 1024 &&
1413 sector_size
!= 2048 &&
1414 sector_size
!= 4096 &&
1415 sector_size
!= 256) {
1416 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1419 * The user might want to re-format the drive with
1420 * a supported sectorsize. Once this happens, it
1421 * would be relatively trivial to set the thing up.
1422 * For this reason, we leave the thing in the table.
1426 * set a bogus sector size so the normal read/write
1427 * logic in the block layer will eventually refuse any
1428 * request on this device without tripping over power
1429 * of two sector size assumptions
1433 blk_queue_hardsect_size(sdp
->request_queue
, sector_size
);
1436 char cap_str_2
[10], cap_str_10
[10];
1437 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1439 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1441 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1442 sizeof(cap_str_10
));
1444 sd_printk(KERN_NOTICE
, sdkp
,
1445 "%llu %d-byte hardware sectors: (%s/%s)\n",
1446 (unsigned long long)sdkp
->capacity
,
1447 sector_size
, cap_str_10
, cap_str_2
);
1450 /* Rescale capacity to 512-byte units */
1451 if (sector_size
== 4096)
1452 sdkp
->capacity
<<= 3;
1453 else if (sector_size
== 2048)
1454 sdkp
->capacity
<<= 2;
1455 else if (sector_size
== 1024)
1456 sdkp
->capacity
<<= 1;
1457 else if (sector_size
== 256)
1458 sdkp
->capacity
>>= 1;
1460 sdkp
->device
->sector_size
= sector_size
;
1463 /* called with buffer of length 512 */
1465 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1466 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1467 struct scsi_sense_hdr
*sshdr
)
1469 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1470 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1475 * read write protect setting, if possible - called only in sd_revalidate_disk()
1476 * called with buffer of length SD_BUF_SIZE
1479 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1482 struct scsi_device
*sdp
= sdkp
->device
;
1483 struct scsi_mode_data data
;
1485 set_disk_ro(sdkp
->disk
, 0);
1486 if (sdp
->skip_ms_page_3f
) {
1487 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1491 if (sdp
->use_192_bytes_for_3f
) {
1492 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1495 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1496 * We have to start carefully: some devices hang if we ask
1497 * for more than is available.
1499 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1502 * Second attempt: ask for page 0 When only page 0 is
1503 * implemented, a request for page 3F may return Sense Key
1504 * 5: Illegal Request, Sense Code 24: Invalid field in
1507 if (!scsi_status_is_good(res
))
1508 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1511 * Third attempt: ask 255 bytes, as we did earlier.
1513 if (!scsi_status_is_good(res
))
1514 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1518 if (!scsi_status_is_good(res
)) {
1519 sd_printk(KERN_WARNING
, sdkp
,
1520 "Test WP failed, assume Write Enabled\n");
1522 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1523 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1524 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1525 sdkp
->write_prot
? "on" : "off");
1526 sd_printk(KERN_DEBUG
, sdkp
,
1527 "Mode Sense: %02x %02x %02x %02x\n",
1528 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1533 * sd_read_cache_type - called only from sd_revalidate_disk()
1534 * called with buffer of length SD_BUF_SIZE
1537 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1540 struct scsi_device
*sdp
= sdkp
->device
;
1544 struct scsi_mode_data data
;
1545 struct scsi_sense_hdr sshdr
;
1547 if (sdp
->skip_ms_page_8
)
1550 if (sdp
->type
== TYPE_RBC
) {
1558 /* cautiously ask */
1559 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1561 if (!scsi_status_is_good(res
))
1564 if (!data
.header_length
) {
1566 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1569 /* that went OK, now ask for the proper length */
1573 * We're only interested in the first three bytes, actually.
1574 * But the data cache page is defined for the first 20.
1581 /* Take headers and block descriptors into account */
1582 len
+= data
.header_length
+ data
.block_descriptor_length
;
1583 if (len
> SD_BUF_SIZE
)
1587 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1589 if (scsi_status_is_good(res
)) {
1590 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1592 if (offset
>= SD_BUF_SIZE
- 2) {
1593 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1597 if ((buffer
[offset
] & 0x3f) != modepage
) {
1598 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1602 if (modepage
== 8) {
1603 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1604 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1606 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1610 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1611 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1612 sd_printk(KERN_NOTICE
, sdkp
,
1613 "Uses READ/WRITE(6), disabling FUA\n");
1617 sd_printk(KERN_NOTICE
, sdkp
,
1618 "Write cache: %s, read cache: %s, %s\n",
1619 sdkp
->WCE
? "enabled" : "disabled",
1620 sdkp
->RCD
? "disabled" : "enabled",
1621 sdkp
->DPOFUA
? "supports DPO and FUA"
1622 : "doesn't support DPO or FUA");
1628 if (scsi_sense_valid(&sshdr
) &&
1629 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1630 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1631 /* Invalid field in CDB */
1632 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1634 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1637 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1644 * The ATO bit indicates whether the DIF application tag is available
1645 * for use by the operating system.
1647 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1650 struct scsi_device
*sdp
= sdkp
->device
;
1651 struct scsi_mode_data data
;
1652 struct scsi_sense_hdr sshdr
;
1654 if (sdp
->type
!= TYPE_DISK
)
1657 if (sdkp
->protection_type
== 0)
1660 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1661 SD_MAX_RETRIES
, &data
, &sshdr
);
1663 if (!scsi_status_is_good(res
) || !data
.header_length
||
1665 sd_printk(KERN_WARNING
, sdkp
,
1666 "getting Control mode page failed, assume no ATO\n");
1668 if (scsi_sense_valid(&sshdr
))
1669 sd_print_sense_hdr(sdkp
, &sshdr
);
1674 offset
= data
.header_length
+ data
.block_descriptor_length
;
1676 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1677 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1681 if ((buffer
[offset
+ 5] & 0x80) == 0)
1690 * sd_revalidate_disk - called the first time a new disk is seen,
1691 * performs disk spin up, read_capacity, etc.
1692 * @disk: struct gendisk we care about
1694 static int sd_revalidate_disk(struct gendisk
*disk
)
1696 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1697 struct scsi_device
*sdp
= sdkp
->device
;
1698 unsigned char *buffer
;
1701 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1702 "sd_revalidate_disk\n"));
1705 * If the device is offline, don't try and read capacity or any
1706 * of the other niceties.
1708 if (!scsi_device_online(sdp
))
1711 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1713 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1714 "allocation failure.\n");
1718 /* defaults, until the device tells us otherwise */
1719 sdp
->sector_size
= 512;
1721 sdkp
->media_present
= 1;
1722 sdkp
->write_prot
= 0;
1727 sd_spinup_disk(sdkp
);
1730 * Without media there is no reason to ask; moreover, some devices
1731 * react badly if we do.
1733 if (sdkp
->media_present
) {
1734 sd_read_capacity(sdkp
, buffer
);
1735 sd_read_write_protect_flag(sdkp
, buffer
);
1736 sd_read_cache_type(sdkp
, buffer
);
1737 sd_read_app_tag_own(sdkp
, buffer
);
1741 * We now have all cache related info, determine how we deal
1742 * with ordered requests. Note that as the current SCSI
1743 * dispatch function can alter request order, we cannot use
1744 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1747 ordered
= sdkp
->DPOFUA
1748 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1750 ordered
= QUEUE_ORDERED_DRAIN
;
1752 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1754 set_capacity(disk
, sdkp
->capacity
);
1762 * sd_format_disk_name - format disk name
1763 * @prefix: name prefix - ie. "sd" for SCSI disks
1764 * @index: index of the disk to format name for
1765 * @buf: output buffer
1766 * @buflen: length of the output buffer
1768 * SCSI disk names starts at sda. The 26th device is sdz and the
1769 * 27th is sdaa. The last one for two lettered suffix is sdzz
1770 * which is followed by sdaaa.
1772 * This is basically 26 base counting with one extra 'nil' entry
1773 * at the beggining from the second digit on and can be
1774 * determined using similar method as 26 base conversion with the
1775 * index shifted -1 after each digit is computed.
1781 * 0 on success, -errno on failure.
1783 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
1785 const int base
= 'z' - 'a' + 1;
1786 char *begin
= buf
+ strlen(prefix
);
1787 char *end
= buf
+ buflen
;
1797 *--p
= 'a' + (index
% unit
);
1798 index
= (index
/ unit
) - 1;
1799 } while (index
>= 0);
1801 memmove(begin
, p
, end
- p
);
1802 memcpy(buf
, prefix
, strlen(prefix
));
1808 * The asynchronous part of sd_probe
1810 static void sd_probe_async(void *data
, async_cookie_t cookie
)
1812 struct scsi_disk
*sdkp
= data
;
1813 struct scsi_device
*sdp
;
1820 index
= sdkp
->index
;
1821 dev
= &sdp
->sdev_gendev
;
1823 if (!sdp
->request_queue
->rq_timeout
) {
1824 if (sdp
->type
!= TYPE_MOD
)
1825 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
1827 blk_queue_rq_timeout(sdp
->request_queue
,
1831 device_initialize(&sdkp
->dev
);
1832 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1833 sdkp
->dev
.class = &sd_disk_class
;
1834 dev_set_name(&sdkp
->dev
, dev_name(&sdp
->sdev_gendev
));
1836 if (device_add(&sdkp
->dev
))
1837 goto out_free_index
;
1839 get_device(&sdp
->sdev_gendev
);
1841 if (index
< SD_MAX_DISKS
) {
1842 gd
->major
= sd_major((index
& 0xf0) >> 4);
1843 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1844 gd
->minors
= SD_MINORS
;
1846 gd
->fops
= &sd_fops
;
1847 gd
->private_data
= &sdkp
->driver
;
1848 gd
->queue
= sdkp
->device
->request_queue
;
1850 sd_revalidate_disk(gd
);
1852 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1854 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1855 gd
->flags
= GENHD_FL_EXT_DEVT
| GENHD_FL_DRIVERFS
;
1857 gd
->flags
|= GENHD_FL_REMOVABLE
;
1859 dev_set_drvdata(dev
, sdkp
);
1861 sd_dif_config_host(sdkp
);
1863 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1864 sdp
->removable
? "removable " : "");
1869 ida_remove(&sd_index_ida
, index
);
1873 * sd_probe - called during driver initialization and whenever a
1874 * new scsi device is attached to the system. It is called once
1875 * for each scsi device (not just disks) present.
1876 * @dev: pointer to device object
1878 * Returns 0 if successful (or not interested in this scsi device
1879 * (e.g. scanner)); 1 when there is an error.
1881 * Note: this function is invoked from the scsi mid-level.
1882 * This function sets up the mapping between a given
1883 * <host,channel,id,lun> (found in sdp) and new device name
1884 * (e.g. /dev/sda). More precisely it is the block device major
1885 * and minor number that is chosen here.
1887 * Assume sd_attach is not re-entrant (for time being)
1888 * Also think about sd_attach() and sd_remove() running coincidentally.
1890 static int sd_probe(struct device
*dev
)
1892 struct scsi_device
*sdp
= to_scsi_device(dev
);
1893 struct scsi_disk
*sdkp
;
1899 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1902 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1906 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1910 gd
= alloc_disk(SD_MINORS
);
1915 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1918 spin_lock(&sd_index_lock
);
1919 error
= ida_get_new(&sd_index_ida
, &index
);
1920 spin_unlock(&sd_index_lock
);
1921 } while (error
== -EAGAIN
);
1926 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
1928 goto out_free_index
;
1931 sdkp
->driver
= &sd_template
;
1933 sdkp
->index
= index
;
1935 sdkp
->previous_state
= 1;
1937 async_schedule(sd_probe_async
, sdkp
);
1942 spin_lock(&sd_index_lock
);
1943 ida_remove(&sd_index_ida
, index
);
1944 spin_unlock(&sd_index_lock
);
1954 * sd_remove - called whenever a scsi disk (previously recognized by
1955 * sd_probe) is detached from the system. It is called (potentially
1956 * multiple times) during sd module unload.
1957 * @sdp: pointer to mid level scsi device object
1959 * Note: this function is invoked from the scsi mid-level.
1960 * This function potentially frees up a device name (e.g. /dev/sdc)
1961 * that could be re-used by a subsequent sd_probe().
1962 * This function is not called when the built-in sd driver is "exit-ed".
1964 static int sd_remove(struct device
*dev
)
1966 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1968 device_del(&sdkp
->dev
);
1969 del_gendisk(sdkp
->disk
);
1972 mutex_lock(&sd_ref_mutex
);
1973 dev_set_drvdata(dev
, NULL
);
1974 put_device(&sdkp
->dev
);
1975 mutex_unlock(&sd_ref_mutex
);
1981 * scsi_disk_release - Called to free the scsi_disk structure
1982 * @dev: pointer to embedded class device
1984 * sd_ref_mutex must be held entering this routine. Because it is
1985 * called on last put, you should always use the scsi_disk_get()
1986 * scsi_disk_put() helpers which manipulate the semaphore directly
1987 * and never do a direct put_device.
1989 static void scsi_disk_release(struct device
*dev
)
1991 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1992 struct gendisk
*disk
= sdkp
->disk
;
1994 spin_lock(&sd_index_lock
);
1995 ida_remove(&sd_index_ida
, sdkp
->index
);
1996 spin_unlock(&sd_index_lock
);
1998 disk
->private_data
= NULL
;
2000 put_device(&sdkp
->device
->sdev_gendev
);
2005 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2007 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2008 struct scsi_sense_hdr sshdr
;
2009 struct scsi_device
*sdp
= sdkp
->device
;
2013 cmd
[4] |= 1; /* START */
2015 if (sdp
->start_stop_pwr_cond
)
2016 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2018 if (!scsi_device_online(sdp
))
2021 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2022 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2024 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2025 sd_print_result(sdkp
, res
);
2026 if (driver_byte(res
) & DRIVER_SENSE
)
2027 sd_print_sense_hdr(sdkp
, &sshdr
);
2034 * Send a SYNCHRONIZE CACHE instruction down to the device through
2035 * the normal SCSI command structure. Wait for the command to
2038 static void sd_shutdown(struct device
*dev
)
2040 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2043 return; /* this can happen */
2046 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2047 sd_sync_cache(sdkp
);
2050 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2051 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2052 sd_start_stop_device(sdkp
, 0);
2055 scsi_disk_put(sdkp
);
2058 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2060 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2064 return 0; /* this can happen */
2067 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2068 ret
= sd_sync_cache(sdkp
);
2073 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2074 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2075 ret
= sd_start_stop_device(sdkp
, 0);
2079 scsi_disk_put(sdkp
);
2083 static int sd_resume(struct device
*dev
)
2085 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2088 if (!sdkp
->device
->manage_start_stop
)
2091 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2092 ret
= sd_start_stop_device(sdkp
, 1);
2095 scsi_disk_put(sdkp
);
2100 * init_sd - entry point for this driver (both when built in or when
2103 * Note: this function registers this driver with the scsi mid-level.
2105 static int __init
init_sd(void)
2107 int majors
= 0, i
, err
;
2109 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2111 for (i
= 0; i
< SD_MAJORS
; i
++)
2112 if (register_blkdev(sd_major(i
), "sd") == 0)
2118 err
= class_register(&sd_disk_class
);
2122 err
= scsi_register_driver(&sd_template
.gendrv
);
2129 class_unregister(&sd_disk_class
);
2131 for (i
= 0; i
< SD_MAJORS
; i
++)
2132 unregister_blkdev(sd_major(i
), "sd");
2137 * exit_sd - exit point for this driver (when it is a module).
2139 * Note: this function unregisters this driver from the scsi mid-level.
2141 static void __exit
exit_sd(void)
2145 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2147 scsi_unregister_driver(&sd_template
.gendrv
);
2148 class_unregister(&sd_disk_class
);
2150 for (i
= 0; i
< SD_MAJORS
; i
++)
2151 unregister_blkdev(sd_major(i
), "sd");
2154 module_init(init_sd
);
2155 module_exit(exit_sd
);
2157 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2158 struct scsi_sense_hdr
*sshdr
)
2160 sd_printk(KERN_INFO
, sdkp
, "");
2161 scsi_show_sense_hdr(sshdr
);
2162 sd_printk(KERN_INFO
, sdkp
, "");
2163 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2166 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2168 sd_printk(KERN_INFO
, sdkp
, "");
2169 scsi_show_result(result
);