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 <asm/uaccess.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_eh.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
65 MODULE_AUTHOR("Eric Youngdale");
66 MODULE_DESCRIPTION("SCSI disk (sd) driver");
67 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
89 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
95 static int sd_revalidate_disk(struct gendisk
*);
96 static int sd_probe(struct device
*);
97 static int sd_remove(struct device
*);
98 static void sd_shutdown(struct device
*);
99 static int sd_suspend(struct device
*, pm_message_t state
);
100 static int sd_resume(struct device
*);
101 static void sd_rescan(struct device
*);
102 static int sd_done(struct scsi_cmnd
*);
103 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
104 static void scsi_disk_release(struct device
*cdev
);
105 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
106 static void sd_print_result(struct scsi_disk
*, int);
108 static DEFINE_IDA(sd_index_ida
);
110 /* This semaphore is used to mediate the 0->1 reference get in the
111 * face of object destruction (i.e. we can't allow a get on an
112 * object after last put) */
113 static DEFINE_MUTEX(sd_ref_mutex
);
115 static const char *sd_cache_types
[] = {
116 "write through", "none", "write back",
117 "write back, no read (daft)"
121 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
122 const char *buf
, size_t count
)
124 int i
, ct
= -1, rcd
, wce
, sp
;
125 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
126 struct scsi_device
*sdp
= sdkp
->device
;
129 struct scsi_mode_data data
;
130 struct scsi_sense_hdr sshdr
;
133 if (sdp
->type
!= TYPE_DISK
)
134 /* no cache control on RBC devices; theoretically they
135 * can do it, but there's probably so many exceptions
136 * it's not worth the risk */
139 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
140 const int len
= strlen(sd_cache_types
[i
]);
141 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
149 rcd
= ct
& 0x01 ? 1 : 0;
150 wce
= ct
& 0x02 ? 1 : 0;
151 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
152 SD_MAX_RETRIES
, &data
, NULL
))
154 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
155 data
.block_descriptor_length
);
156 buffer_data
= buffer
+ data
.header_length
+
157 data
.block_descriptor_length
;
158 buffer_data
[2] &= ~0x05;
159 buffer_data
[2] |= wce
<< 2 | rcd
;
160 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
162 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
163 SD_MAX_RETRIES
, &data
, &sshdr
)) {
164 if (scsi_sense_valid(&sshdr
))
165 sd_print_sense_hdr(sdkp
, &sshdr
);
168 sd_revalidate_disk(sdkp
->disk
);
173 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
174 const char *buf
, size_t count
)
176 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
177 struct scsi_device
*sdp
= sdkp
->device
;
179 if (!capable(CAP_SYS_ADMIN
))
182 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
188 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
189 const char *buf
, size_t count
)
191 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
192 struct scsi_device
*sdp
= sdkp
->device
;
194 if (!capable(CAP_SYS_ADMIN
))
197 if (sdp
->type
!= TYPE_DISK
)
200 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
206 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
209 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
210 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
212 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
216 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
218 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
220 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
224 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
227 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
228 struct scsi_device
*sdp
= sdkp
->device
;
230 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
234 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
237 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
239 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
243 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
246 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
248 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
252 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
255 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
257 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
260 static struct device_attribute sd_disk_attrs
[] = {
261 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
262 sd_store_cache_type
),
263 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
264 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
265 sd_store_allow_restart
),
266 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
267 sd_store_manage_start_stop
),
268 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
269 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
273 static struct class sd_disk_class
= {
275 .owner
= THIS_MODULE
,
276 .dev_release
= scsi_disk_release
,
277 .dev_attrs
= sd_disk_attrs
,
280 static struct scsi_driver sd_template
= {
281 .owner
= THIS_MODULE
,
286 .suspend
= sd_suspend
,
288 .shutdown
= sd_shutdown
,
295 * Device no to disk mapping:
297 * major disc2 disc p1
298 * |............|.............|....|....| <- dev_t
301 * Inside a major, we have 16k disks, however mapped non-
302 * contiguously. The first 16 disks are for major0, the next
303 * ones with major1, ... Disk 256 is for major0 again, disk 272
305 * As we stay compatible with our numbering scheme, we can reuse
306 * the well-know SCSI majors 8, 65--71, 136--143.
308 static int sd_major(int major_idx
)
312 return SCSI_DISK0_MAJOR
;
314 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
316 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
319 return 0; /* shut up gcc */
323 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
325 struct scsi_disk
*sdkp
= NULL
;
327 if (disk
->private_data
) {
328 sdkp
= scsi_disk(disk
);
329 if (scsi_device_get(sdkp
->device
) == 0)
330 get_device(&sdkp
->dev
);
337 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
339 struct scsi_disk
*sdkp
;
341 mutex_lock(&sd_ref_mutex
);
342 sdkp
= __scsi_disk_get(disk
);
343 mutex_unlock(&sd_ref_mutex
);
347 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
349 struct scsi_disk
*sdkp
;
351 mutex_lock(&sd_ref_mutex
);
352 sdkp
= dev_get_drvdata(dev
);
354 sdkp
= __scsi_disk_get(sdkp
->disk
);
355 mutex_unlock(&sd_ref_mutex
);
359 static void scsi_disk_put(struct scsi_disk
*sdkp
)
361 struct scsi_device
*sdev
= sdkp
->device
;
363 mutex_lock(&sd_ref_mutex
);
364 put_device(&sdkp
->dev
);
365 scsi_device_put(sdev
);
366 mutex_unlock(&sd_ref_mutex
);
370 * sd_init_command - build a scsi (read or write) command from
371 * information in the request structure.
372 * @SCpnt: pointer to mid-level's per scsi command structure that
373 * contains request and into which the scsi command is written
375 * Returns 1 if successful and 0 if error (or cannot be done now).
377 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
379 struct scsi_cmnd
*SCpnt
;
380 struct scsi_device
*sdp
= q
->queuedata
;
381 struct gendisk
*disk
= rq
->rq_disk
;
382 struct scsi_disk
*sdkp
;
383 sector_t block
= rq
->sector
;
385 unsigned int this_count
= rq
->nr_sectors
;
386 unsigned int timeout
= sdp
->timeout
;
389 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
390 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
392 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
396 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
397 if (ret
!= BLKPREP_OK
)
400 sdkp
= scsi_disk(disk
);
402 /* from here on until we're complete, any goto out
403 * is used for a killable error condition */
406 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
407 "sd_init_command: block=%llu, "
409 (unsigned long long)block
,
412 if (!sdp
|| !scsi_device_online(sdp
) ||
413 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
414 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
415 "Finishing %ld sectors\n",
417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
418 "Retry with 0x%p\n", SCpnt
));
424 * quietly refuse to do anything to a changed disc until
425 * the changed bit has been reset
427 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
432 * Some SD card readers can't handle multi-sector accesses which touch
433 * the last one or two hardware sectors. Split accesses as needed.
435 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
436 (sdp
->sector_size
/ 512);
438 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
439 if (block
< threshold
) {
440 /* Access up to the threshold but not beyond */
441 this_count
= threshold
- block
;
443 /* Access only a single hardware sector */
444 this_count
= sdp
->sector_size
/ 512;
448 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
449 (unsigned long long)block
));
452 * If we have a 1K hardware sectorsize, prevent access to single
453 * 512 byte sectors. In theory we could handle this - in fact
454 * the scsi cdrom driver must be able to handle this because
455 * we typically use 1K blocksizes, and cdroms typically have
456 * 2K hardware sectorsizes. Of course, things are simpler
457 * with the cdrom, since it is read-only. For performance
458 * reasons, the filesystems should be able to handle this
459 * and not force the scsi disk driver to use bounce buffers
462 if (sdp
->sector_size
== 1024) {
463 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
464 scmd_printk(KERN_ERR
, SCpnt
,
465 "Bad block number requested\n");
469 this_count
= this_count
>> 1;
472 if (sdp
->sector_size
== 2048) {
473 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
474 scmd_printk(KERN_ERR
, SCpnt
,
475 "Bad block number requested\n");
479 this_count
= this_count
>> 2;
482 if (sdp
->sector_size
== 4096) {
483 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
484 scmd_printk(KERN_ERR
, SCpnt
,
485 "Bad block number requested\n");
489 this_count
= this_count
>> 3;
492 if (rq_data_dir(rq
) == WRITE
) {
493 if (!sdp
->writeable
) {
496 SCpnt
->cmnd
[0] = WRITE_6
;
497 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
499 if (blk_integrity_rq(rq
) &&
500 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
503 } else if (rq_data_dir(rq
) == READ
) {
504 SCpnt
->cmnd
[0] = READ_6
;
505 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
507 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
511 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
512 "%s %d/%ld 512 byte blocks.\n",
513 (rq_data_dir(rq
) == WRITE
) ?
514 "writing" : "reading", this_count
,
517 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
518 if (scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
))
519 SCpnt
->cmnd
[1] = 1 << 5;
523 if (block
> 0xffffffff) {
524 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
525 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
526 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
527 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
528 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
529 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
530 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
531 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
532 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
533 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
534 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
535 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
536 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
537 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
538 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
539 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
540 scsi_device_protection(SCpnt
->device
) ||
541 SCpnt
->device
->use_10_for_rw
) {
542 if (this_count
> 0xffff)
545 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
546 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
547 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
548 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
549 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
550 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
551 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
552 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
553 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
555 if (unlikely(blk_fua_rq(rq
))) {
557 * This happens only if this drive failed
558 * 10byte rw command with ILLEGAL_REQUEST
559 * during operation and thus turned off
562 scmd_printk(KERN_ERR
, SCpnt
,
563 "FUA write on READ/WRITE(6) drive\n");
567 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
568 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
569 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
570 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
573 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
575 /* If DIF or DIX is enabled, tell HBA how to handle request */
576 if (sdkp
->protection_type
|| scsi_prot_sg_count(SCpnt
))
577 sd_dif_op(SCpnt
, sdkp
->protection_type
, scsi_prot_sg_count(SCpnt
));
580 * We shouldn't disconnect in the middle of a sector, so with a dumb
581 * host adapter, it's safe to assume that we can at least transfer
582 * this many bytes between each connect / disconnect.
584 SCpnt
->transfersize
= sdp
->sector_size
;
585 SCpnt
->underflow
= this_count
<< 9;
586 SCpnt
->allowed
= SD_MAX_RETRIES
;
587 SCpnt
->timeout_per_command
= timeout
;
590 * This indicates that the command is ready from our end to be
595 return scsi_prep_return(q
, rq
, ret
);
599 * sd_open - open a scsi disk device
600 * @inode: only i_rdev member may be used
601 * @filp: only f_mode and f_flags may be used
603 * Returns 0 if successful. Returns a negated errno value in case
606 * Note: This can be called from a user context (e.g. fsck(1) )
607 * or from within the kernel (e.g. as a result of a mount(1) ).
608 * In the latter case @inode and @filp carry an abridged amount
609 * of information as noted above.
611 static int sd_open(struct inode
*inode
, struct file
*filp
)
613 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
614 struct scsi_disk
*sdkp
;
615 struct scsi_device
*sdev
;
618 if (!(sdkp
= scsi_disk_get(disk
)))
622 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
627 * If the device is in error recovery, wait until it is done.
628 * If the device is offline, then disallow any access to it.
631 if (!scsi_block_when_processing_errors(sdev
))
634 if (sdev
->removable
|| sdkp
->write_prot
)
635 check_disk_change(inode
->i_bdev
);
638 * If the drive is empty, just let the open fail.
641 if (sdev
->removable
&& !sdkp
->media_present
&&
642 !(filp
->f_flags
& O_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
&& (filp
->f_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 inode
*inode
, struct file
*filp
)
688 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
689 struct scsi_disk
*sdkp
= scsi_disk(disk
);
690 struct scsi_device
*sdev
= sdkp
->device
;
692 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
694 if (!--sdkp
->openers
&& sdev
->removable
) {
695 if (scsi_block_when_processing_errors(sdev
))
696 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
700 * XXX and what if there are packets in flight and this close()
701 * XXX is followed by a "rmmod sd_mod"?
707 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
709 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
710 struct scsi_device
*sdp
= sdkp
->device
;
711 struct Scsi_Host
*host
= sdp
->host
;
714 /* default to most commonly used values */
715 diskinfo
[0] = 0x40; /* 1 << 6 */
716 diskinfo
[1] = 0x20; /* 1 << 5 */
717 diskinfo
[2] = sdkp
->capacity
>> 11;
719 /* override with calculated, extended default, or driver values */
720 if (host
->hostt
->bios_param
)
721 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
723 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
725 geo
->heads
= diskinfo
[0];
726 geo
->sectors
= diskinfo
[1];
727 geo
->cylinders
= diskinfo
[2];
732 * sd_ioctl - process an ioctl
733 * @inode: only i_rdev/i_bdev members may be used
734 * @filp: only f_mode and f_flags may be used
735 * @cmd: ioctl command number
736 * @arg: this is third argument given to ioctl(2) system call.
737 * Often contains a pointer.
739 * Returns 0 if successful (some ioctls return postive numbers on
740 * success as well). Returns a negated errno value in case of error.
742 * Note: most ioctls are forward onto the block subsystem or further
743 * down in the scsi subsystem.
745 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
746 unsigned int cmd
, unsigned long arg
)
748 struct block_device
*bdev
= inode
->i_bdev
;
749 struct gendisk
*disk
= bdev
->bd_disk
;
750 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
751 void __user
*p
= (void __user
*)arg
;
754 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
755 disk
->disk_name
, cmd
));
758 * If we are in the middle of error recovery, don't let anyone
759 * else try and use this device. Also, if error recovery fails, it
760 * may try and take the device offline, in which case all further
761 * access to the device is prohibited.
763 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
764 if (!scsi_block_when_processing_errors(sdp
) || !error
)
768 * Send SCSI addressing ioctls directly to mid level, send other
769 * ioctls to block level and then onto mid level if they can't be
773 case SCSI_IOCTL_GET_IDLUN
:
774 case SCSI_IOCTL_GET_BUS_NUMBER
:
775 return scsi_ioctl(sdp
, cmd
, p
);
777 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
778 if (error
!= -ENOTTY
)
781 return scsi_ioctl(sdp
, cmd
, p
);
784 static void set_media_not_present(struct scsi_disk
*sdkp
)
786 sdkp
->media_present
= 0;
788 sdkp
->device
->changed
= 1;
792 * sd_media_changed - check if our medium changed
793 * @disk: kernel device descriptor
795 * Returns 0 if not applicable or no change; 1 if change
797 * Note: this function is invoked from the block subsystem.
799 static int sd_media_changed(struct gendisk
*disk
)
801 struct scsi_disk
*sdkp
= scsi_disk(disk
);
802 struct scsi_device
*sdp
= sdkp
->device
;
803 struct scsi_sense_hdr
*sshdr
= NULL
;
806 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
812 * If the device is offline, don't send any commands - just pretend as
813 * if the command failed. If the device ever comes back online, we
814 * can deal with it then. It is only because of unrecoverable errors
815 * that we would ever take a device offline in the first place.
817 if (!scsi_device_online(sdp
)) {
818 set_media_not_present(sdkp
);
824 * Using TEST_UNIT_READY enables differentiation between drive with
825 * no cartridge loaded - NOT READY, drive with changed cartridge -
826 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
828 * Drives that auto spin down. eg iomega jaz 1G, will be started
829 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
830 * sd_revalidate() is called.
834 if (scsi_block_when_processing_errors(sdp
)) {
835 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
836 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
841 * Unable to test, unit probably not ready. This usually
842 * means there is no disc in the drive. Mark as changed,
843 * and we will figure it out later once the drive is
846 if (retval
|| (scsi_sense_valid(sshdr
) &&
847 /* 0x3a is medium not present */
848 sshdr
->asc
== 0x3a)) {
849 set_media_not_present(sdkp
);
855 * For removable scsi disk we have to recognise the presence
856 * of a disk in the drive. This is kept in the struct scsi_disk
857 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
859 sdkp
->media_present
= 1;
861 retval
= sdp
->changed
;
864 if (retval
!= sdkp
->previous_state
)
865 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
866 sdkp
->previous_state
= retval
;
871 static int sd_sync_cache(struct scsi_disk
*sdkp
)
874 struct scsi_device
*sdp
= sdkp
->device
;
875 struct scsi_sense_hdr sshdr
;
877 if (!scsi_device_online(sdp
))
881 for (retries
= 3; retries
> 0; --retries
) {
882 unsigned char cmd
[10] = { 0 };
884 cmd
[0] = SYNCHRONIZE_CACHE
;
886 * Leave the rest of the command zero to indicate
889 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
890 SD_TIMEOUT
, SD_MAX_RETRIES
);
896 sd_print_result(sdkp
, res
);
897 if (driver_byte(res
) & DRIVER_SENSE
)
898 sd_print_sense_hdr(sdkp
, &sshdr
);
906 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
908 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
909 rq
->timeout
= SD_TIMEOUT
;
910 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
914 static void sd_rescan(struct device
*dev
)
916 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
919 sd_revalidate_disk(sdkp
->disk
);
927 * This gets directly called from VFS. When the ioctl
928 * is not recognized we go back to the other translation paths.
930 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
932 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
933 struct gendisk
*disk
= bdev
->bd_disk
;
934 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
937 * If we are in the middle of error recovery, don't let anyone
938 * else try and use this device. Also, if error recovery fails, it
939 * may try and take the device offline, in which case all further
940 * access to the device is prohibited.
942 if (!scsi_block_when_processing_errors(sdev
))
945 if (sdev
->host
->hostt
->compat_ioctl
) {
948 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
954 * Let the static ioctl translation table take care of it.
960 static struct block_device_operations sd_fops
= {
961 .owner
= THIS_MODULE
,
963 .release
= sd_release
,
967 .compat_ioctl
= sd_compat_ioctl
,
969 .media_changed
= sd_media_changed
,
970 .revalidate_disk
= sd_revalidate_disk
,
973 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
975 u64 start_lba
= scmd
->request
->sector
;
976 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
980 if (!blk_fs_request(scmd
->request
))
983 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
984 SCSI_SENSE_BUFFERSIZE
,
989 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
992 if (scmd
->device
->sector_size
< 512) {
993 /* only legitimate sector_size here is 256 */
997 /* be careful ... don't want any overflows */
998 u64 factor
= scmd
->device
->sector_size
/ 512;
999 do_div(start_lba
, factor
);
1000 do_div(end_lba
, factor
);
1003 /* The bad lba was reported incorrectly, we have no idea where
1006 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1009 /* This computation should always be done in terms of
1010 * the resolution of the device's medium.
1012 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1016 * sd_done - bottom half handler: called when the lower level
1017 * driver has completed (successfully or otherwise) a scsi command.
1018 * @SCpnt: mid-level's per command structure.
1020 * Note: potentially run from within an ISR. Must not block.
1022 static int sd_done(struct scsi_cmnd
*SCpnt
)
1024 int result
= SCpnt
->result
;
1025 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1026 struct scsi_sense_hdr sshdr
;
1027 int sense_valid
= 0;
1028 int sense_deferred
= 0;
1031 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1033 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1035 #ifdef CONFIG_SCSI_LOGGING
1036 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1038 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1039 "sd_done: sb[respc,sk,asc,"
1040 "ascq]=%x,%x,%x,%x\n",
1041 sshdr
.response_code
,
1042 sshdr
.sense_key
, sshdr
.asc
,
1046 if (driver_byte(result
) != DRIVER_SENSE
&&
1047 (!sense_valid
|| sense_deferred
))
1050 switch (sshdr
.sense_key
) {
1051 case HARDWARE_ERROR
:
1053 good_bytes
= sd_completed_bytes(SCpnt
);
1055 case RECOVERED_ERROR
:
1057 /* Inform the user, but make sure that it's not treated
1060 scsi_print_sense("sd", SCpnt
);
1062 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1063 good_bytes
= scsi_bufflen(SCpnt
);
1065 case ABORTED_COMMAND
:
1066 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1067 scsi_print_result(SCpnt
);
1068 scsi_print_sense("sd", SCpnt
);
1069 good_bytes
= sd_completed_bytes(SCpnt
);
1072 case ILLEGAL_REQUEST
:
1073 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1074 scsi_print_result(SCpnt
);
1075 scsi_print_sense("sd", SCpnt
);
1076 good_bytes
= sd_completed_bytes(SCpnt
);
1078 if (!scsi_device_protection(SCpnt
->device
) &&
1079 SCpnt
->device
->use_10_for_rw
&&
1080 (SCpnt
->cmnd
[0] == READ_10
||
1081 SCpnt
->cmnd
[0] == WRITE_10
))
1082 SCpnt
->device
->use_10_for_rw
= 0;
1083 if (SCpnt
->device
->use_10_for_ms
&&
1084 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1085 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1086 SCpnt
->device
->use_10_for_ms
= 0;
1092 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1093 sd_dif_complete(SCpnt
, good_bytes
);
1098 static int media_not_present(struct scsi_disk
*sdkp
,
1099 struct scsi_sense_hdr
*sshdr
)
1102 if (!scsi_sense_valid(sshdr
))
1104 /* not invoked for commands that could return deferred errors */
1105 if (sshdr
->sense_key
!= NOT_READY
&&
1106 sshdr
->sense_key
!= UNIT_ATTENTION
)
1108 if (sshdr
->asc
!= 0x3A) /* medium not present */
1111 set_media_not_present(sdkp
);
1116 * spinup disk - called only in sd_revalidate_disk()
1119 sd_spinup_disk(struct scsi_disk
*sdkp
)
1121 unsigned char cmd
[10];
1122 unsigned long spintime_expire
= 0;
1123 int retries
, spintime
;
1124 unsigned int the_result
;
1125 struct scsi_sense_hdr sshdr
;
1126 int sense_valid
= 0;
1130 /* Spin up drives, as required. Only do this at boot time */
1131 /* Spinup needs to be done for module loads too. */
1136 cmd
[0] = TEST_UNIT_READY
;
1137 memset((void *) &cmd
[1], 0, 9);
1139 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1145 * If the drive has indicated to us that it
1146 * doesn't have any media in it, don't bother
1147 * with any more polling.
1149 if (media_not_present(sdkp
, &sshdr
))
1153 sense_valid
= scsi_sense_valid(&sshdr
);
1155 } while (retries
< 3 &&
1156 (!scsi_status_is_good(the_result
) ||
1157 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1158 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1160 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1161 /* no sense, TUR either succeeded or failed
1162 * with a status error */
1163 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1164 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1165 sd_print_result(sdkp
, the_result
);
1171 * The device does not want the automatic start to be issued.
1173 if (sdkp
->device
->no_start_on_add
) {
1178 * If manual intervention is required, or this is an
1179 * absent USB storage device, a spinup is meaningless.
1182 sshdr
.sense_key
== NOT_READY
&&
1183 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1184 break; /* manual intervention required */
1187 * Issue command to spin up drive when not ready
1189 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1191 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1192 cmd
[0] = START_STOP
;
1193 cmd
[1] = 1; /* Return immediately */
1194 memset((void *) &cmd
[2], 0, 8);
1195 cmd
[4] = 1; /* Start spin cycle */
1196 if (sdkp
->device
->start_stop_pwr_cond
)
1198 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1200 SD_TIMEOUT
, SD_MAX_RETRIES
);
1201 spintime_expire
= jiffies
+ 100 * HZ
;
1204 /* Wait 1 second for next try */
1209 * Wait for USB flash devices with slow firmware.
1210 * Yes, this sense key/ASC combination shouldn't
1211 * occur here. It's characteristic of these devices.
1213 } else if (sense_valid
&&
1214 sshdr
.sense_key
== UNIT_ATTENTION
&&
1215 sshdr
.asc
== 0x28) {
1217 spintime_expire
= jiffies
+ 5 * HZ
;
1220 /* Wait 1 second for next try */
1223 /* we don't understand the sense code, so it's
1224 * probably pointless to loop */
1226 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1227 sd_print_sense_hdr(sdkp
, &sshdr
);
1232 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1235 if (scsi_status_is_good(the_result
))
1238 printk("not responding...\n");
1244 * Determine whether disk supports Data Integrity Field.
1246 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1248 struct scsi_device
*sdp
= sdkp
->device
;
1251 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1254 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1257 case SD_DIF_TYPE0_PROTECTION
:
1258 sdkp
->protection_type
= 0;
1261 case SD_DIF_TYPE1_PROTECTION
:
1262 case SD_DIF_TYPE3_PROTECTION
:
1263 sdkp
->protection_type
= type
;
1266 case SD_DIF_TYPE2_PROTECTION
:
1267 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1268 "protection which is currently unsupported. " \
1269 "Disabling disk!\n");
1273 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1274 "protection type %d. Disabling disk!\n", type
);
1281 sdkp
->protection_type
= 0;
1286 * read disk capacity
1289 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1291 unsigned char cmd
[16];
1292 int the_result
, retries
;
1293 int sector_size
= 0;
1294 /* Force READ CAPACITY(16) when PROTECT=1 */
1295 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1296 struct scsi_sense_hdr sshdr
;
1297 int sense_valid
= 0;
1298 struct scsi_device
*sdp
= sdkp
->device
;
1304 memset((void *) cmd
, 0, 16);
1305 cmd
[0] = SERVICE_ACTION_IN
;
1306 cmd
[1] = SAI_READ_CAPACITY_16
;
1308 memset((void *) buffer
, 0, 13);
1310 cmd
[0] = READ_CAPACITY
;
1311 memset((void *) &cmd
[1], 0, 9);
1312 memset((void *) buffer
, 0, 8);
1315 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1316 buffer
, longrc
? 13 : 8, &sshdr
,
1317 SD_TIMEOUT
, SD_MAX_RETRIES
);
1319 if (media_not_present(sdkp
, &sshdr
))
1323 sense_valid
= scsi_sense_valid(&sshdr
);
1326 } while (the_result
&& retries
);
1328 if (the_result
&& !longrc
) {
1329 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1330 sd_print_result(sdkp
, the_result
);
1331 if (driver_byte(the_result
) & DRIVER_SENSE
)
1332 sd_print_sense_hdr(sdkp
, &sshdr
);
1334 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1336 /* Set dirty bit for removable devices if not ready -
1337 * sometimes drives will not report this properly. */
1338 if (sdp
->removable
&&
1339 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1342 /* Either no media are present but the drive didn't tell us,
1343 or they are present but the read capacity command fails */
1344 /* sdkp->media_present = 0; -- not always correct */
1345 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1348 } else if (the_result
&& longrc
) {
1349 /* READ CAPACITY(16) has been failed */
1350 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1351 sd_print_result(sdkp
, the_result
);
1352 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1354 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1359 sector_size
= (buffer
[4] << 24) |
1360 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1361 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1362 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1363 if(sizeof(sdkp
->capacity
) > 4) {
1364 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1365 "Trying to use READ CAPACITY(16).\n");
1369 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1370 "a kernel compiled with support for large "
1371 "block devices.\n");
1375 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1380 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1381 ((u64
)buffer
[1] << 48) |
1382 ((u64
)buffer
[2] << 40) |
1383 ((u64
)buffer
[3] << 32) |
1384 ((sector_t
)buffer
[4] << 24) |
1385 ((sector_t
)buffer
[5] << 16) |
1386 ((sector_t
)buffer
[6] << 8) |
1387 (sector_t
)buffer
[7]);
1389 sector_size
= (buffer
[8] << 24) |
1390 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1392 sd_read_protection_type(sdkp
, buffer
);
1395 /* Some devices return the total number of sectors, not the
1396 * highest sector number. Make the necessary adjustment. */
1397 if (sdp
->fix_capacity
) {
1400 /* Some devices have version which report the correct sizes
1401 * and others which do not. We guess size according to a heuristic
1402 * and err on the side of lowering the capacity. */
1404 if (sdp
->guess_capacity
)
1405 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1410 if (sector_size
== 0) {
1412 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1416 if (sector_size
!= 512 &&
1417 sector_size
!= 1024 &&
1418 sector_size
!= 2048 &&
1419 sector_size
!= 4096 &&
1420 sector_size
!= 256) {
1421 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1424 * The user might want to re-format the drive with
1425 * a supported sectorsize. Once this happens, it
1426 * would be relatively trivial to set the thing up.
1427 * For this reason, we leave the thing in the table.
1431 * set a bogus sector size so the normal read/write
1432 * logic in the block layer will eventually refuse any
1433 * request on this device without tripping over power
1434 * of two sector size assumptions
1440 * The msdos fs needs to know the hardware sector size
1441 * So I have created this table. See ll_rw_blk.c
1442 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1444 int hard_sector
= sector_size
;
1445 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1446 struct request_queue
*queue
= sdp
->request_queue
;
1449 blk_queue_hardsect_size(queue
, hard_sector
);
1450 /* avoid 64-bit division on 32-bit platforms */
1451 sector_div(sz
, 625);
1453 sector_div(mb
, 1950);
1455 sd_printk(KERN_NOTICE
, sdkp
,
1456 "%llu %d-byte hardware sectors (%llu MB)\n",
1457 (unsigned long long)sdkp
->capacity
,
1458 hard_sector
, (unsigned long long)mb
);
1461 /* Rescale capacity to 512-byte units */
1462 if (sector_size
== 4096)
1463 sdkp
->capacity
<<= 3;
1464 else if (sector_size
== 2048)
1465 sdkp
->capacity
<<= 2;
1466 else if (sector_size
== 1024)
1467 sdkp
->capacity
<<= 1;
1468 else if (sector_size
== 256)
1469 sdkp
->capacity
>>= 1;
1471 sdkp
->device
->sector_size
= sector_size
;
1474 /* called with buffer of length 512 */
1476 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1477 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1478 struct scsi_sense_hdr
*sshdr
)
1480 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1481 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1486 * read write protect setting, if possible - called only in sd_revalidate_disk()
1487 * called with buffer of length SD_BUF_SIZE
1490 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1493 struct scsi_device
*sdp
= sdkp
->device
;
1494 struct scsi_mode_data data
;
1496 set_disk_ro(sdkp
->disk
, 0);
1497 if (sdp
->skip_ms_page_3f
) {
1498 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1502 if (sdp
->use_192_bytes_for_3f
) {
1503 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1506 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1507 * We have to start carefully: some devices hang if we ask
1508 * for more than is available.
1510 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1513 * Second attempt: ask for page 0 When only page 0 is
1514 * implemented, a request for page 3F may return Sense Key
1515 * 5: Illegal Request, Sense Code 24: Invalid field in
1518 if (!scsi_status_is_good(res
))
1519 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1522 * Third attempt: ask 255 bytes, as we did earlier.
1524 if (!scsi_status_is_good(res
))
1525 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1529 if (!scsi_status_is_good(res
)) {
1530 sd_printk(KERN_WARNING
, sdkp
,
1531 "Test WP failed, assume Write Enabled\n");
1533 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1534 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1535 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1536 sdkp
->write_prot
? "on" : "off");
1537 sd_printk(KERN_DEBUG
, sdkp
,
1538 "Mode Sense: %02x %02x %02x %02x\n",
1539 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1544 * sd_read_cache_type - called only from sd_revalidate_disk()
1545 * called with buffer of length SD_BUF_SIZE
1548 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1551 struct scsi_device
*sdp
= sdkp
->device
;
1555 struct scsi_mode_data data
;
1556 struct scsi_sense_hdr sshdr
;
1558 if (sdp
->skip_ms_page_8
)
1561 if (sdp
->type
== TYPE_RBC
) {
1569 /* cautiously ask */
1570 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1572 if (!scsi_status_is_good(res
))
1575 if (!data
.header_length
) {
1577 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1580 /* that went OK, now ask for the proper length */
1584 * We're only interested in the first three bytes, actually.
1585 * But the data cache page is defined for the first 20.
1592 /* Take headers and block descriptors into account */
1593 len
+= data
.header_length
+ data
.block_descriptor_length
;
1594 if (len
> SD_BUF_SIZE
)
1598 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1600 if (scsi_status_is_good(res
)) {
1601 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1603 if (offset
>= SD_BUF_SIZE
- 2) {
1604 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1608 if ((buffer
[offset
] & 0x3f) != modepage
) {
1609 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1613 if (modepage
== 8) {
1614 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1615 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1617 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1621 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1622 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1623 sd_printk(KERN_NOTICE
, sdkp
,
1624 "Uses READ/WRITE(6), disabling FUA\n");
1628 sd_printk(KERN_NOTICE
, sdkp
,
1629 "Write cache: %s, read cache: %s, %s\n",
1630 sdkp
->WCE
? "enabled" : "disabled",
1631 sdkp
->RCD
? "disabled" : "enabled",
1632 sdkp
->DPOFUA
? "supports DPO and FUA"
1633 : "doesn't support DPO or FUA");
1639 if (scsi_sense_valid(&sshdr
) &&
1640 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1641 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1642 /* Invalid field in CDB */
1643 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1645 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1648 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1655 * The ATO bit indicates whether the DIF application tag is available
1656 * for use by the operating system.
1658 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1661 struct scsi_device
*sdp
= sdkp
->device
;
1662 struct scsi_mode_data data
;
1663 struct scsi_sense_hdr sshdr
;
1665 if (sdp
->type
!= TYPE_DISK
)
1668 if (sdkp
->protection_type
== 0)
1671 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1672 SD_MAX_RETRIES
, &data
, &sshdr
);
1674 if (!scsi_status_is_good(res
) || !data
.header_length
||
1676 sd_printk(KERN_WARNING
, sdkp
,
1677 "getting Control mode page failed, assume no ATO\n");
1679 if (scsi_sense_valid(&sshdr
))
1680 sd_print_sense_hdr(sdkp
, &sshdr
);
1685 offset
= data
.header_length
+ data
.block_descriptor_length
;
1687 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1688 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1692 if ((buffer
[offset
+ 5] & 0x80) == 0)
1701 * sd_revalidate_disk - called the first time a new disk is seen,
1702 * performs disk spin up, read_capacity, etc.
1703 * @disk: struct gendisk we care about
1705 static int sd_revalidate_disk(struct gendisk
*disk
)
1707 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1708 struct scsi_device
*sdp
= sdkp
->device
;
1709 unsigned char *buffer
;
1712 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1713 "sd_revalidate_disk\n"));
1716 * If the device is offline, don't try and read capacity or any
1717 * of the other niceties.
1719 if (!scsi_device_online(sdp
))
1722 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1724 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1725 "allocation failure.\n");
1729 /* defaults, until the device tells us otherwise */
1730 sdp
->sector_size
= 512;
1732 sdkp
->media_present
= 1;
1733 sdkp
->write_prot
= 0;
1738 sd_spinup_disk(sdkp
);
1741 * Without media there is no reason to ask; moreover, some devices
1742 * react badly if we do.
1744 if (sdkp
->media_present
) {
1745 sd_read_capacity(sdkp
, buffer
);
1746 sd_read_write_protect_flag(sdkp
, buffer
);
1747 sd_read_cache_type(sdkp
, buffer
);
1748 sd_read_app_tag_own(sdkp
, buffer
);
1752 * We now have all cache related info, determine how we deal
1753 * with ordered requests. Note that as the current SCSI
1754 * dispatch function can alter request order, we cannot use
1755 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1758 ordered
= sdkp
->DPOFUA
1759 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1761 ordered
= QUEUE_ORDERED_DRAIN
;
1763 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1765 set_capacity(disk
, sdkp
->capacity
);
1773 * sd_probe - called during driver initialization and whenever a
1774 * new scsi device is attached to the system. It is called once
1775 * for each scsi device (not just disks) present.
1776 * @dev: pointer to device object
1778 * Returns 0 if successful (or not interested in this scsi device
1779 * (e.g. scanner)); 1 when there is an error.
1781 * Note: this function is invoked from the scsi mid-level.
1782 * This function sets up the mapping between a given
1783 * <host,channel,id,lun> (found in sdp) and new device name
1784 * (e.g. /dev/sda). More precisely it is the block device major
1785 * and minor number that is chosen here.
1787 * Assume sd_attach is not re-entrant (for time being)
1788 * Also think about sd_attach() and sd_remove() running coincidentally.
1790 static int sd_probe(struct device
*dev
)
1792 struct scsi_device
*sdp
= to_scsi_device(dev
);
1793 struct scsi_disk
*sdkp
;
1799 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1802 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1806 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1810 gd
= alloc_disk(SD_MINORS
);
1815 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1818 error
= ida_get_new(&sd_index_ida
, &index
);
1819 } while (error
== -EAGAIN
);
1825 if (index
>= SD_MAX_DISKS
)
1826 goto out_free_index
;
1829 sdkp
->driver
= &sd_template
;
1831 sdkp
->index
= index
;
1833 sdkp
->previous_state
= 1;
1835 if (!sdp
->timeout
) {
1836 if (sdp
->type
!= TYPE_MOD
)
1837 sdp
->timeout
= SD_TIMEOUT
;
1839 sdp
->timeout
= SD_MOD_TIMEOUT
;
1842 device_initialize(&sdkp
->dev
);
1843 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1844 sdkp
->dev
.class = &sd_disk_class
;
1845 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1847 if (device_add(&sdkp
->dev
))
1848 goto out_free_index
;
1850 get_device(&sdp
->sdev_gendev
);
1852 gd
->major
= sd_major((index
& 0xf0) >> 4);
1853 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1854 gd
->minors
= SD_MINORS
;
1855 gd
->fops
= &sd_fops
;
1858 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1859 } else if (index
< (26 + 1) * 26) {
1860 sprintf(gd
->disk_name
, "sd%c%c",
1861 'a' + index
/ 26 - 1,'a' + index
% 26);
1863 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1864 const unsigned int m2
= (index
/ 26 - 1) % 26;
1865 const unsigned int m3
= index
% 26;
1866 sprintf(gd
->disk_name
, "sd%c%c%c",
1867 'a' + m1
, 'a' + m2
, 'a' + m3
);
1870 gd
->private_data
= &sdkp
->driver
;
1871 gd
->queue
= sdkp
->device
->request_queue
;
1873 sd_revalidate_disk(gd
);
1875 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1877 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1878 gd
->flags
= GENHD_FL_EXT_DEVT
| GENHD_FL_DRIVERFS
;
1880 gd
->flags
|= GENHD_FL_REMOVABLE
;
1882 dev_set_drvdata(dev
, sdkp
);
1884 sd_dif_config_host(sdkp
);
1886 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1887 sdp
->removable
? "removable " : "");
1892 ida_remove(&sd_index_ida
, index
);
1902 * sd_remove - called whenever a scsi disk (previously recognized by
1903 * sd_probe) is detached from the system. It is called (potentially
1904 * multiple times) during sd module unload.
1905 * @sdp: pointer to mid level scsi device object
1907 * Note: this function is invoked from the scsi mid-level.
1908 * This function potentially frees up a device name (e.g. /dev/sdc)
1909 * that could be re-used by a subsequent sd_probe().
1910 * This function is not called when the built-in sd driver is "exit-ed".
1912 static int sd_remove(struct device
*dev
)
1914 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1916 device_del(&sdkp
->dev
);
1917 del_gendisk(sdkp
->disk
);
1920 mutex_lock(&sd_ref_mutex
);
1921 dev_set_drvdata(dev
, NULL
);
1922 put_device(&sdkp
->dev
);
1923 mutex_unlock(&sd_ref_mutex
);
1929 * scsi_disk_release - Called to free the scsi_disk structure
1930 * @dev: pointer to embedded class device
1932 * sd_ref_mutex must be held entering this routine. Because it is
1933 * called on last put, you should always use the scsi_disk_get()
1934 * scsi_disk_put() helpers which manipulate the semaphore directly
1935 * and never do a direct put_device.
1937 static void scsi_disk_release(struct device
*dev
)
1939 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1940 struct gendisk
*disk
= sdkp
->disk
;
1942 ida_remove(&sd_index_ida
, sdkp
->index
);
1944 disk
->private_data
= NULL
;
1946 put_device(&sdkp
->device
->sdev_gendev
);
1951 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1953 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1954 struct scsi_sense_hdr sshdr
;
1955 struct scsi_device
*sdp
= sdkp
->device
;
1959 cmd
[4] |= 1; /* START */
1961 if (sdp
->start_stop_pwr_cond
)
1962 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1964 if (!scsi_device_online(sdp
))
1967 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1968 SD_TIMEOUT
, SD_MAX_RETRIES
);
1970 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1971 sd_print_result(sdkp
, res
);
1972 if (driver_byte(res
) & DRIVER_SENSE
)
1973 sd_print_sense_hdr(sdkp
, &sshdr
);
1980 * Send a SYNCHRONIZE CACHE instruction down to the device through
1981 * the normal SCSI command structure. Wait for the command to
1984 static void sd_shutdown(struct device
*dev
)
1986 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1989 return; /* this can happen */
1992 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1993 sd_sync_cache(sdkp
);
1996 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1997 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1998 sd_start_stop_device(sdkp
, 0);
2001 scsi_disk_put(sdkp
);
2004 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2006 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2010 return 0; /* this can happen */
2013 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2014 ret
= sd_sync_cache(sdkp
);
2019 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2020 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2021 ret
= sd_start_stop_device(sdkp
, 0);
2025 scsi_disk_put(sdkp
);
2029 static int sd_resume(struct device
*dev
)
2031 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2034 if (!sdkp
->device
->manage_start_stop
)
2037 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2038 ret
= sd_start_stop_device(sdkp
, 1);
2041 scsi_disk_put(sdkp
);
2046 * init_sd - entry point for this driver (both when built in or when
2049 * Note: this function registers this driver with the scsi mid-level.
2051 static int __init
init_sd(void)
2053 int majors
= 0, i
, err
;
2055 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2057 for (i
= 0; i
< SD_MAJORS
; i
++)
2058 if (register_blkdev(sd_major(i
), "sd") == 0)
2064 err
= class_register(&sd_disk_class
);
2068 err
= scsi_register_driver(&sd_template
.gendrv
);
2075 class_unregister(&sd_disk_class
);
2077 for (i
= 0; i
< SD_MAJORS
; i
++)
2078 unregister_blkdev(sd_major(i
), "sd");
2083 * exit_sd - exit point for this driver (when it is a module).
2085 * Note: this function unregisters this driver from the scsi mid-level.
2087 static void __exit
exit_sd(void)
2091 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2093 scsi_unregister_driver(&sd_template
.gendrv
);
2094 class_unregister(&sd_disk_class
);
2096 for (i
= 0; i
< SD_MAJORS
; i
++)
2097 unregister_blkdev(sd_major(i
), "sd");
2100 module_init(init_sd
);
2101 module_exit(exit_sd
);
2103 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2104 struct scsi_sense_hdr
*sshdr
)
2106 sd_printk(KERN_INFO
, sdkp
, "");
2107 scsi_show_sense_hdr(sshdr
);
2108 sd_printk(KERN_INFO
, sdkp
, "");
2109 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2112 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2114 sd_printk(KERN_INFO
, sdkp
, "");
2115 scsi_show_result(result
);