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
);
91 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
97 #define SD_EXT_MINORS (SD_PARTS - SD_MINORS)
99 static int sd_revalidate_disk(struct gendisk
*);
100 static int sd_probe(struct device
*);
101 static int sd_remove(struct device
*);
102 static void sd_shutdown(struct device
*);
103 static int sd_suspend(struct device
*, pm_message_t state
);
104 static int sd_resume(struct device
*);
105 static void sd_rescan(struct device
*);
106 static int sd_done(struct scsi_cmnd
*);
107 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
108 static void scsi_disk_release(struct device
*cdev
);
109 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
110 static void sd_print_result(struct scsi_disk
*, int);
112 static DEFINE_IDA(sd_index_ida
);
114 /* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
117 static DEFINE_MUTEX(sd_ref_mutex
);
119 static const char *sd_cache_types
[] = {
120 "write through", "none", "write back",
121 "write back, no read (daft)"
125 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
126 const char *buf
, size_t count
)
128 int i
, ct
= -1, rcd
, wce
, sp
;
129 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
130 struct scsi_device
*sdp
= sdkp
->device
;
133 struct scsi_mode_data data
;
134 struct scsi_sense_hdr sshdr
;
137 if (sdp
->type
!= TYPE_DISK
)
138 /* no cache control on RBC devices; theoretically they
139 * can do it, but there's probably so many exceptions
140 * it's not worth the risk */
143 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
144 const int len
= strlen(sd_cache_types
[i
]);
145 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
153 rcd
= ct
& 0x01 ? 1 : 0;
154 wce
= ct
& 0x02 ? 1 : 0;
155 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
156 SD_MAX_RETRIES
, &data
, NULL
))
158 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
159 data
.block_descriptor_length
);
160 buffer_data
= buffer
+ data
.header_length
+
161 data
.block_descriptor_length
;
162 buffer_data
[2] &= ~0x05;
163 buffer_data
[2] |= wce
<< 2 | rcd
;
164 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
166 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
167 SD_MAX_RETRIES
, &data
, &sshdr
)) {
168 if (scsi_sense_valid(&sshdr
))
169 sd_print_sense_hdr(sdkp
, &sshdr
);
172 sd_revalidate_disk(sdkp
->disk
);
177 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
178 const char *buf
, size_t count
)
180 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
181 struct scsi_device
*sdp
= sdkp
->device
;
183 if (!capable(CAP_SYS_ADMIN
))
186 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
192 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
193 const char *buf
, size_t count
)
195 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
196 struct scsi_device
*sdp
= sdkp
->device
;
198 if (!capable(CAP_SYS_ADMIN
))
201 if (sdp
->type
!= TYPE_DISK
)
204 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
210 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
213 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
214 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
216 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
220 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
222 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
224 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
228 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
231 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
232 struct scsi_device
*sdp
= sdkp
->device
;
234 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
238 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
241 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
243 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
247 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
250 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
252 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
256 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
259 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
261 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
264 static struct device_attribute sd_disk_attrs
[] = {
265 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
266 sd_store_cache_type
),
267 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
268 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
269 sd_store_allow_restart
),
270 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
271 sd_store_manage_start_stop
),
272 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
273 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
277 static struct class sd_disk_class
= {
279 .owner
= THIS_MODULE
,
280 .dev_release
= scsi_disk_release
,
281 .dev_attrs
= sd_disk_attrs
,
284 static struct scsi_driver sd_template
= {
285 .owner
= THIS_MODULE
,
290 .suspend
= sd_suspend
,
292 .shutdown
= sd_shutdown
,
299 * Device no to disk mapping:
301 * major disc2 disc p1
302 * |............|.............|....|....| <- dev_t
305 * Inside a major, we have 16k disks, however mapped non-
306 * contiguously. The first 16 disks are for major0, the next
307 * ones with major1, ... Disk 256 is for major0 again, disk 272
309 * As we stay compatible with our numbering scheme, we can reuse
310 * the well-know SCSI majors 8, 65--71, 136--143.
312 static int sd_major(int major_idx
)
316 return SCSI_DISK0_MAJOR
;
318 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
320 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
323 return 0; /* shut up gcc */
327 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
329 struct scsi_disk
*sdkp
= NULL
;
331 if (disk
->private_data
) {
332 sdkp
= scsi_disk(disk
);
333 if (scsi_device_get(sdkp
->device
) == 0)
334 get_device(&sdkp
->dev
);
341 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
343 struct scsi_disk
*sdkp
;
345 mutex_lock(&sd_ref_mutex
);
346 sdkp
= __scsi_disk_get(disk
);
347 mutex_unlock(&sd_ref_mutex
);
351 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
353 struct scsi_disk
*sdkp
;
355 mutex_lock(&sd_ref_mutex
);
356 sdkp
= dev_get_drvdata(dev
);
358 sdkp
= __scsi_disk_get(sdkp
->disk
);
359 mutex_unlock(&sd_ref_mutex
);
363 static void scsi_disk_put(struct scsi_disk
*sdkp
)
365 struct scsi_device
*sdev
= sdkp
->device
;
367 mutex_lock(&sd_ref_mutex
);
368 put_device(&sdkp
->dev
);
369 scsi_device_put(sdev
);
370 mutex_unlock(&sd_ref_mutex
);
374 * sd_init_command - build a scsi (read or write) command from
375 * information in the request structure.
376 * @SCpnt: pointer to mid-level's per scsi command structure that
377 * contains request and into which the scsi command is written
379 * Returns 1 if successful and 0 if error (or cannot be done now).
381 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
383 struct scsi_cmnd
*SCpnt
;
384 struct scsi_device
*sdp
= q
->queuedata
;
385 struct gendisk
*disk
= rq
->rq_disk
;
386 struct scsi_disk
*sdkp
;
387 sector_t block
= rq
->sector
;
389 unsigned int this_count
= rq
->nr_sectors
;
390 unsigned int timeout
= sdp
->timeout
;
393 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
394 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
396 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
400 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
401 if (ret
!= BLKPREP_OK
)
404 sdkp
= scsi_disk(disk
);
406 /* from here on until we're complete, any goto out
407 * is used for a killable error condition */
410 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
411 "sd_init_command: block=%llu, "
413 (unsigned long long)block
,
416 if (!sdp
|| !scsi_device_online(sdp
) ||
417 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
418 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
419 "Finishing %ld sectors\n",
421 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
422 "Retry with 0x%p\n", SCpnt
));
428 * quietly refuse to do anything to a changed disc until
429 * the changed bit has been reset
431 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
436 * Some SD card readers can't handle multi-sector accesses which touch
437 * the last one or two hardware sectors. Split accesses as needed.
439 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
440 (sdp
->sector_size
/ 512);
442 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
443 if (block
< threshold
) {
444 /* Access up to the threshold but not beyond */
445 this_count
= threshold
- block
;
447 /* Access only a single hardware sector */
448 this_count
= sdp
->sector_size
/ 512;
452 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
453 (unsigned long long)block
));
456 * If we have a 1K hardware sectorsize, prevent access to single
457 * 512 byte sectors. In theory we could handle this - in fact
458 * the scsi cdrom driver must be able to handle this because
459 * we typically use 1K blocksizes, and cdroms typically have
460 * 2K hardware sectorsizes. Of course, things are simpler
461 * with the cdrom, since it is read-only. For performance
462 * reasons, the filesystems should be able to handle this
463 * and not force the scsi disk driver to use bounce buffers
466 if (sdp
->sector_size
== 1024) {
467 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
468 scmd_printk(KERN_ERR
, SCpnt
,
469 "Bad block number requested\n");
473 this_count
= this_count
>> 1;
476 if (sdp
->sector_size
== 2048) {
477 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
478 scmd_printk(KERN_ERR
, SCpnt
,
479 "Bad block number requested\n");
483 this_count
= this_count
>> 2;
486 if (sdp
->sector_size
== 4096) {
487 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
488 scmd_printk(KERN_ERR
, SCpnt
,
489 "Bad block number requested\n");
493 this_count
= this_count
>> 3;
496 if (rq_data_dir(rq
) == WRITE
) {
497 if (!sdp
->writeable
) {
500 SCpnt
->cmnd
[0] = WRITE_6
;
501 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
503 if (blk_integrity_rq(rq
) &&
504 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
507 } else if (rq_data_dir(rq
) == READ
) {
508 SCpnt
->cmnd
[0] = READ_6
;
509 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
511 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
515 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
516 "%s %d/%ld 512 byte blocks.\n",
517 (rq_data_dir(rq
) == WRITE
) ?
518 "writing" : "reading", this_count
,
521 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
522 if (scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
))
523 SCpnt
->cmnd
[1] = 1 << 5;
527 if (block
> 0xffffffff) {
528 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
529 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
530 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
531 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
532 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
533 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
534 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
535 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
536 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
537 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
538 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
539 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
540 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
541 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
542 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
543 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
544 scsi_device_protection(SCpnt
->device
) ||
545 SCpnt
->device
->use_10_for_rw
) {
546 if (this_count
> 0xffff)
549 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
550 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
551 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
552 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
553 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
554 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
555 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
556 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
557 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
559 if (unlikely(blk_fua_rq(rq
))) {
561 * This happens only if this drive failed
562 * 10byte rw command with ILLEGAL_REQUEST
563 * during operation and thus turned off
566 scmd_printk(KERN_ERR
, SCpnt
,
567 "FUA write on READ/WRITE(6) drive\n");
571 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
572 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
573 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
574 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
577 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
579 /* If DIF or DIX is enabled, tell HBA how to handle request */
580 if (sdkp
->protection_type
|| scsi_prot_sg_count(SCpnt
))
581 sd_dif_op(SCpnt
, sdkp
->protection_type
, scsi_prot_sg_count(SCpnt
));
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
;
591 SCpnt
->timeout_per_command
= timeout
;
594 * This indicates that the command is ready from our end to be
599 return scsi_prep_return(q
, rq
, ret
);
603 * sd_open - open a scsi disk device
604 * @inode: only i_rdev member may be used
605 * @filp: only f_mode and f_flags may be used
607 * Returns 0 if successful. Returns a negated errno value in case
610 * Note: This can be called from a user context (e.g. fsck(1) )
611 * or from within the kernel (e.g. as a result of a mount(1) ).
612 * In the latter case @inode and @filp carry an abridged amount
613 * of information as noted above.
615 static int sd_open(struct inode
*inode
, struct file
*filp
)
617 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
618 struct scsi_disk
*sdkp
;
619 struct scsi_device
*sdev
;
622 if (!(sdkp
= scsi_disk_get(disk
)))
626 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
631 * If the device is in error recovery, wait until it is done.
632 * If the device is offline, then disallow any access to it.
635 if (!scsi_block_when_processing_errors(sdev
))
638 if (sdev
->removable
|| sdkp
->write_prot
)
639 check_disk_change(inode
->i_bdev
);
642 * If the drive is empty, just let the open fail.
645 if (sdev
->removable
&& !sdkp
->media_present
&&
646 !(filp
->f_flags
& O_NDELAY
))
650 * If the device has the write protect tab set, have the open fail
651 * if the user expects to be able to write to the thing.
654 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
658 * It is possible that the disk changing stuff resulted in
659 * the device being taken offline. If this is the case,
660 * report this to the user, and don't pretend that the
661 * open actually succeeded.
664 if (!scsi_device_online(sdev
))
667 if (!sdkp
->openers
++ && sdev
->removable
) {
668 if (scsi_block_when_processing_errors(sdev
))
669 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
680 * sd_release - invoked when the (last) close(2) is called on this
682 * @inode: only i_rdev member may be used
683 * @filp: only f_mode and f_flags may be used
687 * Note: may block (uninterruptible) if error recovery is underway
690 static int sd_release(struct inode
*inode
, struct file
*filp
)
692 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
693 struct scsi_disk
*sdkp
= scsi_disk(disk
);
694 struct scsi_device
*sdev
= sdkp
->device
;
696 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
698 if (!--sdkp
->openers
&& sdev
->removable
) {
699 if (scsi_block_when_processing_errors(sdev
))
700 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
704 * XXX and what if there are packets in flight and this close()
705 * XXX is followed by a "rmmod sd_mod"?
711 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
713 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
714 struct scsi_device
*sdp
= sdkp
->device
;
715 struct Scsi_Host
*host
= sdp
->host
;
718 /* default to most commonly used values */
719 diskinfo
[0] = 0x40; /* 1 << 6 */
720 diskinfo
[1] = 0x20; /* 1 << 5 */
721 diskinfo
[2] = sdkp
->capacity
>> 11;
723 /* override with calculated, extended default, or driver values */
724 if (host
->hostt
->bios_param
)
725 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
727 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
729 geo
->heads
= diskinfo
[0];
730 geo
->sectors
= diskinfo
[1];
731 geo
->cylinders
= diskinfo
[2];
736 * sd_ioctl - process an ioctl
737 * @inode: only i_rdev/i_bdev members may be used
738 * @filp: only f_mode and f_flags may be used
739 * @cmd: ioctl command number
740 * @arg: this is third argument given to ioctl(2) system call.
741 * Often contains a pointer.
743 * Returns 0 if successful (some ioctls return postive numbers on
744 * success as well). Returns a negated errno value in case of error.
746 * Note: most ioctls are forward onto the block subsystem or further
747 * down in the scsi subsystem.
749 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
750 unsigned int cmd
, unsigned long arg
)
752 struct block_device
*bdev
= inode
->i_bdev
;
753 struct gendisk
*disk
= bdev
->bd_disk
;
754 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
755 void __user
*p
= (void __user
*)arg
;
758 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
759 disk
->disk_name
, cmd
));
762 * If we are in the middle of error recovery, don't let anyone
763 * else try and use this device. Also, if error recovery fails, it
764 * may try and take the device offline, in which case all further
765 * access to the device is prohibited.
767 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
768 if (!scsi_block_when_processing_errors(sdp
) || !error
)
772 * Send SCSI addressing ioctls directly to mid level, send other
773 * ioctls to block level and then onto mid level if they can't be
777 case SCSI_IOCTL_GET_IDLUN
:
778 case SCSI_IOCTL_GET_BUS_NUMBER
:
779 return scsi_ioctl(sdp
, cmd
, p
);
781 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
782 if (error
!= -ENOTTY
)
785 return scsi_ioctl(sdp
, cmd
, p
);
788 static void set_media_not_present(struct scsi_disk
*sdkp
)
790 sdkp
->media_present
= 0;
792 sdkp
->device
->changed
= 1;
796 * sd_media_changed - check if our medium changed
797 * @disk: kernel device descriptor
799 * Returns 0 if not applicable or no change; 1 if change
801 * Note: this function is invoked from the block subsystem.
803 static int sd_media_changed(struct gendisk
*disk
)
805 struct scsi_disk
*sdkp
= scsi_disk(disk
);
806 struct scsi_device
*sdp
= sdkp
->device
;
807 struct scsi_sense_hdr
*sshdr
= NULL
;
810 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
816 * If the device is offline, don't send any commands - just pretend as
817 * if the command failed. If the device ever comes back online, we
818 * can deal with it then. It is only because of unrecoverable errors
819 * that we would ever take a device offline in the first place.
821 if (!scsi_device_online(sdp
)) {
822 set_media_not_present(sdkp
);
828 * Using TEST_UNIT_READY enables differentiation between drive with
829 * no cartridge loaded - NOT READY, drive with changed cartridge -
830 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
832 * Drives that auto spin down. eg iomega jaz 1G, will be started
833 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
834 * sd_revalidate() is called.
838 if (scsi_block_when_processing_errors(sdp
)) {
839 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
840 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
845 * Unable to test, unit probably not ready. This usually
846 * means there is no disc in the drive. Mark as changed,
847 * and we will figure it out later once the drive is
850 if (retval
|| (scsi_sense_valid(sshdr
) &&
851 /* 0x3a is medium not present */
852 sshdr
->asc
== 0x3a)) {
853 set_media_not_present(sdkp
);
859 * For removable scsi disk we have to recognise the presence
860 * of a disk in the drive. This is kept in the struct scsi_disk
861 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
863 sdkp
->media_present
= 1;
865 retval
= sdp
->changed
;
868 if (retval
!= sdkp
->previous_state
)
869 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
870 sdkp
->previous_state
= retval
;
875 static int sd_sync_cache(struct scsi_disk
*sdkp
)
878 struct scsi_device
*sdp
= sdkp
->device
;
879 struct scsi_sense_hdr sshdr
;
881 if (!scsi_device_online(sdp
))
885 for (retries
= 3; retries
> 0; --retries
) {
886 unsigned char cmd
[10] = { 0 };
888 cmd
[0] = SYNCHRONIZE_CACHE
;
890 * Leave the rest of the command zero to indicate
893 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
894 SD_TIMEOUT
, SD_MAX_RETRIES
);
900 sd_print_result(sdkp
, res
);
901 if (driver_byte(res
) & DRIVER_SENSE
)
902 sd_print_sense_hdr(sdkp
, &sshdr
);
910 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
912 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
913 rq
->timeout
= SD_TIMEOUT
;
914 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
918 static void sd_rescan(struct device
*dev
)
920 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
923 sd_revalidate_disk(sdkp
->disk
);
931 * This gets directly called from VFS. When the ioctl
932 * is not recognized we go back to the other translation paths.
934 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
936 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
937 struct gendisk
*disk
= bdev
->bd_disk
;
938 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
941 * If we are in the middle of error recovery, don't let anyone
942 * else try and use this device. Also, if error recovery fails, it
943 * may try and take the device offline, in which case all further
944 * access to the device is prohibited.
946 if (!scsi_block_when_processing_errors(sdev
))
949 if (sdev
->host
->hostt
->compat_ioctl
) {
952 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
958 * Let the static ioctl translation table take care of it.
964 static struct block_device_operations sd_fops
= {
965 .owner
= THIS_MODULE
,
967 .release
= sd_release
,
971 .compat_ioctl
= sd_compat_ioctl
,
973 .media_changed
= sd_media_changed
,
974 .revalidate_disk
= sd_revalidate_disk
,
977 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
979 u64 start_lba
= scmd
->request
->sector
;
980 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
984 if (!blk_fs_request(scmd
->request
))
987 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
988 SCSI_SENSE_BUFFERSIZE
,
993 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
996 if (scmd
->device
->sector_size
< 512) {
997 /* only legitimate sector_size here is 256 */
1001 /* be careful ... don't want any overflows */
1002 u64 factor
= scmd
->device
->sector_size
/ 512;
1003 do_div(start_lba
, factor
);
1004 do_div(end_lba
, factor
);
1007 /* The bad lba was reported incorrectly, we have no idea where
1010 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1013 /* This computation should always be done in terms of
1014 * the resolution of the device's medium.
1016 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1020 * sd_done - bottom half handler: called when the lower level
1021 * driver has completed (successfully or otherwise) a scsi command.
1022 * @SCpnt: mid-level's per command structure.
1024 * Note: potentially run from within an ISR. Must not block.
1026 static int sd_done(struct scsi_cmnd
*SCpnt
)
1028 int result
= SCpnt
->result
;
1029 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1030 struct scsi_sense_hdr sshdr
;
1031 int sense_valid
= 0;
1032 int sense_deferred
= 0;
1035 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1037 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1039 #ifdef CONFIG_SCSI_LOGGING
1040 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1042 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1043 "sd_done: sb[respc,sk,asc,"
1044 "ascq]=%x,%x,%x,%x\n",
1045 sshdr
.response_code
,
1046 sshdr
.sense_key
, sshdr
.asc
,
1050 if (driver_byte(result
) != DRIVER_SENSE
&&
1051 (!sense_valid
|| sense_deferred
))
1054 switch (sshdr
.sense_key
) {
1055 case HARDWARE_ERROR
:
1057 good_bytes
= sd_completed_bytes(SCpnt
);
1059 case RECOVERED_ERROR
:
1061 /* Inform the user, but make sure that it's not treated
1064 scsi_print_sense("sd", SCpnt
);
1066 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1067 good_bytes
= scsi_bufflen(SCpnt
);
1069 case ABORTED_COMMAND
:
1070 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1071 scsi_print_result(SCpnt
);
1072 scsi_print_sense("sd", SCpnt
);
1073 good_bytes
= sd_completed_bytes(SCpnt
);
1076 case ILLEGAL_REQUEST
:
1077 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1078 scsi_print_result(SCpnt
);
1079 scsi_print_sense("sd", SCpnt
);
1080 good_bytes
= sd_completed_bytes(SCpnt
);
1082 if (!scsi_device_protection(SCpnt
->device
) &&
1083 SCpnt
->device
->use_10_for_rw
&&
1084 (SCpnt
->cmnd
[0] == READ_10
||
1085 SCpnt
->cmnd
[0] == WRITE_10
))
1086 SCpnt
->device
->use_10_for_rw
= 0;
1087 if (SCpnt
->device
->use_10_for_ms
&&
1088 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1089 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1090 SCpnt
->device
->use_10_for_ms
= 0;
1096 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1097 sd_dif_complete(SCpnt
, good_bytes
);
1102 static int media_not_present(struct scsi_disk
*sdkp
,
1103 struct scsi_sense_hdr
*sshdr
)
1106 if (!scsi_sense_valid(sshdr
))
1108 /* not invoked for commands that could return deferred errors */
1109 if (sshdr
->sense_key
!= NOT_READY
&&
1110 sshdr
->sense_key
!= UNIT_ATTENTION
)
1112 if (sshdr
->asc
!= 0x3A) /* medium not present */
1115 set_media_not_present(sdkp
);
1120 * spinup disk - called only in sd_revalidate_disk()
1123 sd_spinup_disk(struct scsi_disk
*sdkp
)
1125 unsigned char cmd
[10];
1126 unsigned long spintime_expire
= 0;
1127 int retries
, spintime
;
1128 unsigned int the_result
;
1129 struct scsi_sense_hdr sshdr
;
1130 int sense_valid
= 0;
1134 /* Spin up drives, as required. Only do this at boot time */
1135 /* Spinup needs to be done for module loads too. */
1140 cmd
[0] = TEST_UNIT_READY
;
1141 memset((void *) &cmd
[1], 0, 9);
1143 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1149 * If the drive has indicated to us that it
1150 * doesn't have any media in it, don't bother
1151 * with any more polling.
1153 if (media_not_present(sdkp
, &sshdr
))
1157 sense_valid
= scsi_sense_valid(&sshdr
);
1159 } while (retries
< 3 &&
1160 (!scsi_status_is_good(the_result
) ||
1161 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1162 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1164 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1165 /* no sense, TUR either succeeded or failed
1166 * with a status error */
1167 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1168 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1169 sd_print_result(sdkp
, the_result
);
1175 * The device does not want the automatic start to be issued.
1177 if (sdkp
->device
->no_start_on_add
) {
1182 * If manual intervention is required, or this is an
1183 * absent USB storage device, a spinup is meaningless.
1186 sshdr
.sense_key
== NOT_READY
&&
1187 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1188 break; /* manual intervention required */
1191 * Issue command to spin up drive when not ready
1193 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1195 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1196 cmd
[0] = START_STOP
;
1197 cmd
[1] = 1; /* Return immediately */
1198 memset((void *) &cmd
[2], 0, 8);
1199 cmd
[4] = 1; /* Start spin cycle */
1200 if (sdkp
->device
->start_stop_pwr_cond
)
1202 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1204 SD_TIMEOUT
, SD_MAX_RETRIES
);
1205 spintime_expire
= jiffies
+ 100 * HZ
;
1208 /* Wait 1 second for next try */
1213 * Wait for USB flash devices with slow firmware.
1214 * Yes, this sense key/ASC combination shouldn't
1215 * occur here. It's characteristic of these devices.
1217 } else if (sense_valid
&&
1218 sshdr
.sense_key
== UNIT_ATTENTION
&&
1219 sshdr
.asc
== 0x28) {
1221 spintime_expire
= jiffies
+ 5 * HZ
;
1224 /* Wait 1 second for next try */
1227 /* we don't understand the sense code, so it's
1228 * probably pointless to loop */
1230 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1231 sd_print_sense_hdr(sdkp
, &sshdr
);
1236 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1239 if (scsi_status_is_good(the_result
))
1242 printk("not responding...\n");
1248 * Determine whether disk supports Data Integrity Field.
1250 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1252 struct scsi_device
*sdp
= sdkp
->device
;
1255 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1258 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1261 case SD_DIF_TYPE0_PROTECTION
:
1262 sdkp
->protection_type
= 0;
1265 case SD_DIF_TYPE1_PROTECTION
:
1266 case SD_DIF_TYPE3_PROTECTION
:
1267 sdkp
->protection_type
= type
;
1270 case SD_DIF_TYPE2_PROTECTION
:
1271 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1272 "protection which is currently unsupported. " \
1273 "Disabling disk!\n");
1277 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1278 "protection type %d. Disabling disk!\n", type
);
1285 sdkp
->protection_type
= 0;
1290 * read disk capacity
1293 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1295 unsigned char cmd
[16];
1296 int the_result
, retries
;
1297 int sector_size
= 0;
1298 /* Force READ CAPACITY(16) when PROTECT=1 */
1299 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1300 struct scsi_sense_hdr sshdr
;
1301 int sense_valid
= 0;
1302 struct scsi_device
*sdp
= sdkp
->device
;
1308 memset((void *) cmd
, 0, 16);
1309 cmd
[0] = SERVICE_ACTION_IN
;
1310 cmd
[1] = SAI_READ_CAPACITY_16
;
1312 memset((void *) buffer
, 0, 13);
1314 cmd
[0] = READ_CAPACITY
;
1315 memset((void *) &cmd
[1], 0, 9);
1316 memset((void *) buffer
, 0, 8);
1319 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1320 buffer
, longrc
? 13 : 8, &sshdr
,
1321 SD_TIMEOUT
, SD_MAX_RETRIES
);
1323 if (media_not_present(sdkp
, &sshdr
))
1327 sense_valid
= scsi_sense_valid(&sshdr
);
1330 } while (the_result
&& retries
);
1332 if (the_result
&& !longrc
) {
1333 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1334 sd_print_result(sdkp
, the_result
);
1335 if (driver_byte(the_result
) & DRIVER_SENSE
)
1336 sd_print_sense_hdr(sdkp
, &sshdr
);
1338 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1340 /* Set dirty bit for removable devices if not ready -
1341 * sometimes drives will not report this properly. */
1342 if (sdp
->removable
&&
1343 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1346 /* Either no media are present but the drive didn't tell us,
1347 or they are present but the read capacity command fails */
1348 /* sdkp->media_present = 0; -- not always correct */
1349 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1352 } else if (the_result
&& longrc
) {
1353 /* READ CAPACITY(16) has been failed */
1354 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1355 sd_print_result(sdkp
, the_result
);
1356 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1358 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1363 sector_size
= (buffer
[4] << 24) |
1364 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1365 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1366 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1367 if(sizeof(sdkp
->capacity
) > 4) {
1368 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1369 "Trying to use READ CAPACITY(16).\n");
1373 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1374 "a kernel compiled with support for large "
1375 "block devices.\n");
1379 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1384 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1385 ((u64
)buffer
[1] << 48) |
1386 ((u64
)buffer
[2] << 40) |
1387 ((u64
)buffer
[3] << 32) |
1388 ((sector_t
)buffer
[4] << 24) |
1389 ((sector_t
)buffer
[5] << 16) |
1390 ((sector_t
)buffer
[6] << 8) |
1391 (sector_t
)buffer
[7]);
1393 sector_size
= (buffer
[8] << 24) |
1394 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1396 sd_read_protection_type(sdkp
, buffer
);
1399 /* Some devices return the total number of sectors, not the
1400 * highest sector number. Make the necessary adjustment. */
1401 if (sdp
->fix_capacity
) {
1404 /* Some devices have version which report the correct sizes
1405 * and others which do not. We guess size according to a heuristic
1406 * and err on the side of lowering the capacity. */
1408 if (sdp
->guess_capacity
)
1409 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1414 if (sector_size
== 0) {
1416 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1420 if (sector_size
!= 512 &&
1421 sector_size
!= 1024 &&
1422 sector_size
!= 2048 &&
1423 sector_size
!= 4096 &&
1424 sector_size
!= 256) {
1425 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1428 * The user might want to re-format the drive with
1429 * a supported sectorsize. Once this happens, it
1430 * would be relatively trivial to set the thing up.
1431 * For this reason, we leave the thing in the table.
1435 * set a bogus sector size so the normal read/write
1436 * logic in the block layer will eventually refuse any
1437 * request on this device without tripping over power
1438 * of two sector size assumptions
1444 * The msdos fs needs to know the hardware sector size
1445 * So I have created this table. See ll_rw_blk.c
1446 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1448 int hard_sector
= sector_size
;
1449 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1450 struct request_queue
*queue
= sdp
->request_queue
;
1453 blk_queue_hardsect_size(queue
, hard_sector
);
1454 /* avoid 64-bit division on 32-bit platforms */
1455 sector_div(sz
, 625);
1457 sector_div(mb
, 1950);
1459 sd_printk(KERN_NOTICE
, sdkp
,
1460 "%llu %d-byte hardware sectors (%llu MB)\n",
1461 (unsigned long long)sdkp
->capacity
,
1462 hard_sector
, (unsigned long long)mb
);
1465 /* Rescale capacity to 512-byte units */
1466 if (sector_size
== 4096)
1467 sdkp
->capacity
<<= 3;
1468 else if (sector_size
== 2048)
1469 sdkp
->capacity
<<= 2;
1470 else if (sector_size
== 1024)
1471 sdkp
->capacity
<<= 1;
1472 else if (sector_size
== 256)
1473 sdkp
->capacity
>>= 1;
1475 sdkp
->device
->sector_size
= sector_size
;
1478 /* called with buffer of length 512 */
1480 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1481 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1482 struct scsi_sense_hdr
*sshdr
)
1484 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1485 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1490 * read write protect setting, if possible - called only in sd_revalidate_disk()
1491 * called with buffer of length SD_BUF_SIZE
1494 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1497 struct scsi_device
*sdp
= sdkp
->device
;
1498 struct scsi_mode_data data
;
1500 set_disk_ro(sdkp
->disk
, 0);
1501 if (sdp
->skip_ms_page_3f
) {
1502 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1506 if (sdp
->use_192_bytes_for_3f
) {
1507 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1510 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1511 * We have to start carefully: some devices hang if we ask
1512 * for more than is available.
1514 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1517 * Second attempt: ask for page 0 When only page 0 is
1518 * implemented, a request for page 3F may return Sense Key
1519 * 5: Illegal Request, Sense Code 24: Invalid field in
1522 if (!scsi_status_is_good(res
))
1523 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1526 * Third attempt: ask 255 bytes, as we did earlier.
1528 if (!scsi_status_is_good(res
))
1529 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1533 if (!scsi_status_is_good(res
)) {
1534 sd_printk(KERN_WARNING
, sdkp
,
1535 "Test WP failed, assume Write Enabled\n");
1537 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1538 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1539 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1540 sdkp
->write_prot
? "on" : "off");
1541 sd_printk(KERN_DEBUG
, sdkp
,
1542 "Mode Sense: %02x %02x %02x %02x\n",
1543 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1548 * sd_read_cache_type - called only from sd_revalidate_disk()
1549 * called with buffer of length SD_BUF_SIZE
1552 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1555 struct scsi_device
*sdp
= sdkp
->device
;
1559 struct scsi_mode_data data
;
1560 struct scsi_sense_hdr sshdr
;
1562 if (sdp
->skip_ms_page_8
)
1565 if (sdp
->type
== TYPE_RBC
) {
1573 /* cautiously ask */
1574 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1576 if (!scsi_status_is_good(res
))
1579 if (!data
.header_length
) {
1581 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1584 /* that went OK, now ask for the proper length */
1588 * We're only interested in the first three bytes, actually.
1589 * But the data cache page is defined for the first 20.
1596 /* Take headers and block descriptors into account */
1597 len
+= data
.header_length
+ data
.block_descriptor_length
;
1598 if (len
> SD_BUF_SIZE
)
1602 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1604 if (scsi_status_is_good(res
)) {
1605 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1607 if (offset
>= SD_BUF_SIZE
- 2) {
1608 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1612 if ((buffer
[offset
] & 0x3f) != modepage
) {
1613 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1617 if (modepage
== 8) {
1618 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1619 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1621 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1625 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1626 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1627 sd_printk(KERN_NOTICE
, sdkp
,
1628 "Uses READ/WRITE(6), disabling FUA\n");
1632 sd_printk(KERN_NOTICE
, sdkp
,
1633 "Write cache: %s, read cache: %s, %s\n",
1634 sdkp
->WCE
? "enabled" : "disabled",
1635 sdkp
->RCD
? "disabled" : "enabled",
1636 sdkp
->DPOFUA
? "supports DPO and FUA"
1637 : "doesn't support DPO or FUA");
1643 if (scsi_sense_valid(&sshdr
) &&
1644 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1645 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1646 /* Invalid field in CDB */
1647 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1649 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1652 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1659 * The ATO bit indicates whether the DIF application tag is available
1660 * for use by the operating system.
1662 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1665 struct scsi_device
*sdp
= sdkp
->device
;
1666 struct scsi_mode_data data
;
1667 struct scsi_sense_hdr sshdr
;
1669 if (sdp
->type
!= TYPE_DISK
)
1672 if (sdkp
->protection_type
== 0)
1675 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1676 SD_MAX_RETRIES
, &data
, &sshdr
);
1678 if (!scsi_status_is_good(res
) || !data
.header_length
||
1680 sd_printk(KERN_WARNING
, sdkp
,
1681 "getting Control mode page failed, assume no ATO\n");
1683 if (scsi_sense_valid(&sshdr
))
1684 sd_print_sense_hdr(sdkp
, &sshdr
);
1689 offset
= data
.header_length
+ data
.block_descriptor_length
;
1691 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1692 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1696 if ((buffer
[offset
+ 5] & 0x80) == 0)
1705 * sd_revalidate_disk - called the first time a new disk is seen,
1706 * performs disk spin up, read_capacity, etc.
1707 * @disk: struct gendisk we care about
1709 static int sd_revalidate_disk(struct gendisk
*disk
)
1711 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1712 struct scsi_device
*sdp
= sdkp
->device
;
1713 unsigned char *buffer
;
1716 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1717 "sd_revalidate_disk\n"));
1720 * If the device is offline, don't try and read capacity or any
1721 * of the other niceties.
1723 if (!scsi_device_online(sdp
))
1726 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1728 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1729 "allocation failure.\n");
1733 /* defaults, until the device tells us otherwise */
1734 sdp
->sector_size
= 512;
1736 sdkp
->media_present
= 1;
1737 sdkp
->write_prot
= 0;
1742 sd_spinup_disk(sdkp
);
1745 * Without media there is no reason to ask; moreover, some devices
1746 * react badly if we do.
1748 if (sdkp
->media_present
) {
1749 sd_read_capacity(sdkp
, buffer
);
1750 sd_read_write_protect_flag(sdkp
, buffer
);
1751 sd_read_cache_type(sdkp
, buffer
);
1752 sd_read_app_tag_own(sdkp
, buffer
);
1756 * We now have all cache related info, determine how we deal
1757 * with ordered requests. Note that as the current SCSI
1758 * dispatch function can alter request order, we cannot use
1759 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1762 ordered
= sdkp
->DPOFUA
1763 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1765 ordered
= QUEUE_ORDERED_DRAIN
;
1767 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1769 set_capacity(disk
, sdkp
->capacity
);
1777 * sd_probe - called during driver initialization and whenever a
1778 * new scsi device is attached to the system. It is called once
1779 * for each scsi device (not just disks) present.
1780 * @dev: pointer to device object
1782 * Returns 0 if successful (or not interested in this scsi device
1783 * (e.g. scanner)); 1 when there is an error.
1785 * Note: this function is invoked from the scsi mid-level.
1786 * This function sets up the mapping between a given
1787 * <host,channel,id,lun> (found in sdp) and new device name
1788 * (e.g. /dev/sda). More precisely it is the block device major
1789 * and minor number that is chosen here.
1791 * Assume sd_attach is not re-entrant (for time being)
1792 * Also think about sd_attach() and sd_remove() running coincidentally.
1794 static int sd_probe(struct device
*dev
)
1796 struct scsi_device
*sdp
= to_scsi_device(dev
);
1797 struct scsi_disk
*sdkp
;
1803 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1806 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1810 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1814 gd
= alloc_disk_ext(SD_MINORS
, SD_EXT_MINORS
);
1819 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1822 error
= ida_get_new(&sd_index_ida
, &index
);
1823 } while (error
== -EAGAIN
);
1829 if (index
>= SD_MAX_DISKS
)
1830 goto out_free_index
;
1833 sdkp
->driver
= &sd_template
;
1835 sdkp
->index
= index
;
1837 sdkp
->previous_state
= 1;
1839 if (!sdp
->timeout
) {
1840 if (sdp
->type
!= TYPE_MOD
)
1841 sdp
->timeout
= SD_TIMEOUT
;
1843 sdp
->timeout
= SD_MOD_TIMEOUT
;
1846 device_initialize(&sdkp
->dev
);
1847 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1848 sdkp
->dev
.class = &sd_disk_class
;
1849 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1851 if (device_add(&sdkp
->dev
))
1852 goto out_free_index
;
1854 get_device(&sdp
->sdev_gendev
);
1856 gd
->major
= sd_major((index
& 0xf0) >> 4);
1857 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1858 gd
->minors
= SD_MINORS
;
1859 gd
->ext_minors
= SD_EXT_MINORS
;
1860 gd
->fops
= &sd_fops
;
1863 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1864 } else if (index
< (26 + 1) * 26) {
1865 sprintf(gd
->disk_name
, "sd%c%c",
1866 'a' + index
/ 26 - 1,'a' + index
% 26);
1868 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1869 const unsigned int m2
= (index
/ 26 - 1) % 26;
1870 const unsigned int m3
= index
% 26;
1871 sprintf(gd
->disk_name
, "sd%c%c%c",
1872 'a' + m1
, 'a' + m2
, 'a' + m3
);
1875 gd
->private_data
= &sdkp
->driver
;
1876 gd
->queue
= sdkp
->device
->request_queue
;
1878 sd_revalidate_disk(gd
);
1880 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1882 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1883 gd
->flags
= GENHD_FL_DRIVERFS
;
1885 gd
->flags
|= GENHD_FL_REMOVABLE
;
1887 dev_set_drvdata(dev
, sdkp
);
1889 sd_dif_config_host(sdkp
);
1891 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1892 sdp
->removable
? "removable " : "");
1897 ida_remove(&sd_index_ida
, index
);
1907 * sd_remove - called whenever a scsi disk (previously recognized by
1908 * sd_probe) is detached from the system. It is called (potentially
1909 * multiple times) during sd module unload.
1910 * @sdp: pointer to mid level scsi device object
1912 * Note: this function is invoked from the scsi mid-level.
1913 * This function potentially frees up a device name (e.g. /dev/sdc)
1914 * that could be re-used by a subsequent sd_probe().
1915 * This function is not called when the built-in sd driver is "exit-ed".
1917 static int sd_remove(struct device
*dev
)
1919 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1921 device_del(&sdkp
->dev
);
1922 del_gendisk(sdkp
->disk
);
1925 mutex_lock(&sd_ref_mutex
);
1926 dev_set_drvdata(dev
, NULL
);
1927 put_device(&sdkp
->dev
);
1928 mutex_unlock(&sd_ref_mutex
);
1934 * scsi_disk_release - Called to free the scsi_disk structure
1935 * @dev: pointer to embedded class device
1937 * sd_ref_mutex must be held entering this routine. Because it is
1938 * called on last put, you should always use the scsi_disk_get()
1939 * scsi_disk_put() helpers which manipulate the semaphore directly
1940 * and never do a direct put_device.
1942 static void scsi_disk_release(struct device
*dev
)
1944 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1945 struct gendisk
*disk
= sdkp
->disk
;
1947 ida_remove(&sd_index_ida
, sdkp
->index
);
1949 disk
->private_data
= NULL
;
1951 put_device(&sdkp
->device
->sdev_gendev
);
1956 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1958 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1959 struct scsi_sense_hdr sshdr
;
1960 struct scsi_device
*sdp
= sdkp
->device
;
1964 cmd
[4] |= 1; /* START */
1966 if (sdp
->start_stop_pwr_cond
)
1967 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1969 if (!scsi_device_online(sdp
))
1972 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1973 SD_TIMEOUT
, SD_MAX_RETRIES
);
1975 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1976 sd_print_result(sdkp
, res
);
1977 if (driver_byte(res
) & DRIVER_SENSE
)
1978 sd_print_sense_hdr(sdkp
, &sshdr
);
1985 * Send a SYNCHRONIZE CACHE instruction down to the device through
1986 * the normal SCSI command structure. Wait for the command to
1989 static void sd_shutdown(struct device
*dev
)
1991 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1994 return; /* this can happen */
1997 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1998 sd_sync_cache(sdkp
);
2001 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2002 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2003 sd_start_stop_device(sdkp
, 0);
2006 scsi_disk_put(sdkp
);
2009 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2011 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2015 return 0; /* this can happen */
2018 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2019 ret
= sd_sync_cache(sdkp
);
2024 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2025 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2026 ret
= sd_start_stop_device(sdkp
, 0);
2030 scsi_disk_put(sdkp
);
2034 static int sd_resume(struct device
*dev
)
2036 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2039 if (!sdkp
->device
->manage_start_stop
)
2042 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2043 ret
= sd_start_stop_device(sdkp
, 1);
2046 scsi_disk_put(sdkp
);
2051 * init_sd - entry point for this driver (both when built in or when
2054 * Note: this function registers this driver with the scsi mid-level.
2056 static int __init
init_sd(void)
2058 int majors
= 0, i
, err
;
2060 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2062 for (i
= 0; i
< SD_MAJORS
; i
++)
2063 if (register_blkdev(sd_major(i
), "sd") == 0)
2069 err
= class_register(&sd_disk_class
);
2073 err
= scsi_register_driver(&sd_template
.gendrv
);
2080 class_unregister(&sd_disk_class
);
2082 for (i
= 0; i
< SD_MAJORS
; i
++)
2083 unregister_blkdev(sd_major(i
), "sd");
2088 * exit_sd - exit point for this driver (when it is a module).
2090 * Note: this function unregisters this driver from the scsi mid-level.
2092 static void __exit
exit_sd(void)
2096 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2098 scsi_unregister_driver(&sd_template
.gendrv
);
2099 class_unregister(&sd_disk_class
);
2101 for (i
= 0; i
< SD_MAJORS
; i
++)
2102 unregister_blkdev(sd_major(i
), "sd");
2105 module_init(init_sd
);
2106 module_exit(exit_sd
);
2108 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2109 struct scsi_sense_hdr
*sshdr
)
2111 sd_printk(KERN_INFO
, sdkp
, "");
2112 scsi_show_sense_hdr(sshdr
);
2113 sd_printk(KERN_INFO
, sdkp
, "");
2114 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2117 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2119 sd_printk(KERN_INFO
, sdkp
, "");
2120 scsi_show_result(result
);