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 static int sd_revalidate_disk(struct gendisk
*);
90 static int sd_probe(struct device
*);
91 static int sd_remove(struct device
*);
92 static void sd_shutdown(struct device
*);
93 static int sd_suspend(struct device
*, pm_message_t state
);
94 static int sd_resume(struct device
*);
95 static void sd_rescan(struct device
*);
96 static int sd_done(struct scsi_cmnd
*);
97 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
98 static void scsi_disk_release(struct device
*cdev
);
99 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
100 static void sd_print_result(struct scsi_disk
*, int);
102 static DEFINE_IDA(sd_index_ida
);
104 /* This semaphore is used to mediate the 0->1 reference get in the
105 * face of object destruction (i.e. we can't allow a get on an
106 * object after last put) */
107 static DEFINE_MUTEX(sd_ref_mutex
);
109 static const char *sd_cache_types
[] = {
110 "write through", "none", "write back",
111 "write back, no read (daft)"
115 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
116 const char *buf
, size_t count
)
118 int i
, ct
= -1, rcd
, wce
, sp
;
119 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
120 struct scsi_device
*sdp
= sdkp
->device
;
123 struct scsi_mode_data data
;
124 struct scsi_sense_hdr sshdr
;
127 if (sdp
->type
!= TYPE_DISK
)
128 /* no cache control on RBC devices; theoretically they
129 * can do it, but there's probably so many exceptions
130 * it's not worth the risk */
133 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
134 const int len
= strlen(sd_cache_types
[i
]);
135 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
143 rcd
= ct
& 0x01 ? 1 : 0;
144 wce
= ct
& 0x02 ? 1 : 0;
145 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
146 SD_MAX_RETRIES
, &data
, NULL
))
148 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
149 data
.block_descriptor_length
);
150 buffer_data
= buffer
+ data
.header_length
+
151 data
.block_descriptor_length
;
152 buffer_data
[2] &= ~0x05;
153 buffer_data
[2] |= wce
<< 2 | rcd
;
154 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
156 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
157 SD_MAX_RETRIES
, &data
, &sshdr
)) {
158 if (scsi_sense_valid(&sshdr
))
159 sd_print_sense_hdr(sdkp
, &sshdr
);
162 sd_revalidate_disk(sdkp
->disk
);
167 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
168 const char *buf
, size_t count
)
170 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
171 struct scsi_device
*sdp
= sdkp
->device
;
173 if (!capable(CAP_SYS_ADMIN
))
176 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
182 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
183 const char *buf
, size_t count
)
185 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
186 struct scsi_device
*sdp
= sdkp
->device
;
188 if (!capable(CAP_SYS_ADMIN
))
191 if (sdp
->type
!= TYPE_DISK
)
194 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
200 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
203 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
204 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
206 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
210 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
212 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
214 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
218 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
221 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
222 struct scsi_device
*sdp
= sdkp
->device
;
224 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
228 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
231 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
233 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
237 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
240 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
242 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
246 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
249 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
251 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
254 static struct device_attribute sd_disk_attrs
[] = {
255 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
256 sd_store_cache_type
),
257 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
258 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
259 sd_store_allow_restart
),
260 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
261 sd_store_manage_start_stop
),
262 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
263 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
267 static struct class sd_disk_class
= {
269 .owner
= THIS_MODULE
,
270 .dev_release
= scsi_disk_release
,
271 .dev_attrs
= sd_disk_attrs
,
274 static struct scsi_driver sd_template
= {
275 .owner
= THIS_MODULE
,
280 .suspend
= sd_suspend
,
282 .shutdown
= sd_shutdown
,
289 * Device no to disk mapping:
291 * major disc2 disc p1
292 * |............|.............|....|....| <- dev_t
295 * Inside a major, we have 16k disks, however mapped non-
296 * contiguously. The first 16 disks are for major0, the next
297 * ones with major1, ... Disk 256 is for major0 again, disk 272
299 * As we stay compatible with our numbering scheme, we can reuse
300 * the well-know SCSI majors 8, 65--71, 136--143.
302 static int sd_major(int major_idx
)
306 return SCSI_DISK0_MAJOR
;
308 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
310 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
313 return 0; /* shut up gcc */
317 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
319 struct scsi_disk
*sdkp
= NULL
;
321 if (disk
->private_data
) {
322 sdkp
= scsi_disk(disk
);
323 if (scsi_device_get(sdkp
->device
) == 0)
324 get_device(&sdkp
->dev
);
331 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
333 struct scsi_disk
*sdkp
;
335 mutex_lock(&sd_ref_mutex
);
336 sdkp
= __scsi_disk_get(disk
);
337 mutex_unlock(&sd_ref_mutex
);
341 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
343 struct scsi_disk
*sdkp
;
345 mutex_lock(&sd_ref_mutex
);
346 sdkp
= dev_get_drvdata(dev
);
348 sdkp
= __scsi_disk_get(sdkp
->disk
);
349 mutex_unlock(&sd_ref_mutex
);
353 static void scsi_disk_put(struct scsi_disk
*sdkp
)
355 struct scsi_device
*sdev
= sdkp
->device
;
357 mutex_lock(&sd_ref_mutex
);
358 put_device(&sdkp
->dev
);
359 scsi_device_put(sdev
);
360 mutex_unlock(&sd_ref_mutex
);
364 * sd_init_command - build a scsi (read or write) command from
365 * information in the request structure.
366 * @SCpnt: pointer to mid-level's per scsi command structure that
367 * contains request and into which the scsi command is written
369 * Returns 1 if successful and 0 if error (or cannot be done now).
371 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
373 struct scsi_cmnd
*SCpnt
;
374 struct scsi_device
*sdp
= q
->queuedata
;
375 struct gendisk
*disk
= rq
->rq_disk
;
376 struct scsi_disk
*sdkp
;
377 sector_t block
= rq
->sector
;
378 unsigned int this_count
= rq
->nr_sectors
;
379 unsigned int timeout
= sdp
->timeout
;
382 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
383 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
385 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
389 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
390 if (ret
!= BLKPREP_OK
)
393 sdkp
= scsi_disk(disk
);
395 /* from here on until we're complete, any goto out
396 * is used for a killable error condition */
399 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
400 "sd_init_command: block=%llu, "
402 (unsigned long long)block
,
405 if (!sdp
|| !scsi_device_online(sdp
) ||
406 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
407 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
408 "Finishing %ld sectors\n",
410 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
411 "Retry with 0x%p\n", SCpnt
));
417 * quietly refuse to do anything to a changed disc until
418 * the changed bit has been reset
420 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
425 * Some devices (some sdcards for one) don't like it if the
426 * last sector gets read in a larger then 1 sector read.
428 if (unlikely(sdp
->last_sector_bug
&&
429 rq
->nr_sectors
> sdp
->sector_size
/ 512 &&
430 block
+ this_count
== get_capacity(disk
)))
431 this_count
-= sdp
->sector_size
/ 512;
433 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
434 (unsigned long long)block
));
437 * If we have a 1K hardware sectorsize, prevent access to single
438 * 512 byte sectors. In theory we could handle this - in fact
439 * the scsi cdrom driver must be able to handle this because
440 * we typically use 1K blocksizes, and cdroms typically have
441 * 2K hardware sectorsizes. Of course, things are simpler
442 * with the cdrom, since it is read-only. For performance
443 * reasons, the filesystems should be able to handle this
444 * and not force the scsi disk driver to use bounce buffers
447 if (sdp
->sector_size
== 1024) {
448 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
449 scmd_printk(KERN_ERR
, SCpnt
,
450 "Bad block number requested\n");
454 this_count
= this_count
>> 1;
457 if (sdp
->sector_size
== 2048) {
458 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
459 scmd_printk(KERN_ERR
, SCpnt
,
460 "Bad block number requested\n");
464 this_count
= this_count
>> 2;
467 if (sdp
->sector_size
== 4096) {
468 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
469 scmd_printk(KERN_ERR
, SCpnt
,
470 "Bad block number requested\n");
474 this_count
= this_count
>> 3;
477 if (rq_data_dir(rq
) == WRITE
) {
478 if (!sdp
->writeable
) {
481 SCpnt
->cmnd
[0] = WRITE_6
;
482 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
484 if (blk_integrity_rq(rq
) &&
485 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
488 } else if (rq_data_dir(rq
) == READ
) {
489 SCpnt
->cmnd
[0] = READ_6
;
490 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
492 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
496 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
497 "%s %d/%ld 512 byte blocks.\n",
498 (rq_data_dir(rq
) == WRITE
) ?
499 "writing" : "reading", this_count
,
502 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
503 if (scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
))
504 SCpnt
->cmnd
[1] = 1 << 5;
508 if (block
> 0xffffffff) {
509 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
510 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
511 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
512 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
513 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
514 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
515 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
516 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
517 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
518 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
519 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
520 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
521 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
522 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
523 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
524 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
525 scsi_device_protection(SCpnt
->device
) ||
526 SCpnt
->device
->use_10_for_rw
) {
527 if (this_count
> 0xffff)
530 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
531 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
532 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
533 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
534 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
535 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
536 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
537 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
538 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
540 if (unlikely(blk_fua_rq(rq
))) {
542 * This happens only if this drive failed
543 * 10byte rw command with ILLEGAL_REQUEST
544 * during operation and thus turned off
547 scmd_printk(KERN_ERR
, SCpnt
,
548 "FUA write on READ/WRITE(6) drive\n");
552 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
553 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
554 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
555 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
558 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
560 /* If DIF or DIX is enabled, tell HBA how to handle request */
561 if (sdkp
->protection_type
|| scsi_prot_sg_count(SCpnt
))
562 sd_dif_op(SCpnt
, sdkp
->protection_type
, scsi_prot_sg_count(SCpnt
));
565 * We shouldn't disconnect in the middle of a sector, so with a dumb
566 * host adapter, it's safe to assume that we can at least transfer
567 * this many bytes between each connect / disconnect.
569 SCpnt
->transfersize
= sdp
->sector_size
;
570 SCpnt
->underflow
= this_count
<< 9;
571 SCpnt
->allowed
= SD_MAX_RETRIES
;
572 SCpnt
->timeout_per_command
= timeout
;
575 * This indicates that the command is ready from our end to be
580 return scsi_prep_return(q
, rq
, ret
);
584 * sd_open - open a scsi disk device
585 * @inode: only i_rdev member may be used
586 * @filp: only f_mode and f_flags may be used
588 * Returns 0 if successful. Returns a negated errno value in case
591 * Note: This can be called from a user context (e.g. fsck(1) )
592 * or from within the kernel (e.g. as a result of a mount(1) ).
593 * In the latter case @inode and @filp carry an abridged amount
594 * of information as noted above.
596 static int sd_open(struct inode
*inode
, struct file
*filp
)
598 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
599 struct scsi_disk
*sdkp
;
600 struct scsi_device
*sdev
;
603 if (!(sdkp
= scsi_disk_get(disk
)))
607 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
612 * If the device is in error recovery, wait until it is done.
613 * If the device is offline, then disallow any access to it.
616 if (!scsi_block_when_processing_errors(sdev
))
619 if (sdev
->removable
|| sdkp
->write_prot
)
620 check_disk_change(inode
->i_bdev
);
623 * If the drive is empty, just let the open fail.
626 if (sdev
->removable
&& !sdkp
->media_present
&&
627 !(filp
->f_flags
& O_NDELAY
))
631 * If the device has the write protect tab set, have the open fail
632 * if the user expects to be able to write to the thing.
635 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
639 * It is possible that the disk changing stuff resulted in
640 * the device being taken offline. If this is the case,
641 * report this to the user, and don't pretend that the
642 * open actually succeeded.
645 if (!scsi_device_online(sdev
))
648 if (!sdkp
->openers
++ && sdev
->removable
) {
649 if (scsi_block_when_processing_errors(sdev
))
650 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
661 * sd_release - invoked when the (last) close(2) is called on this
663 * @inode: only i_rdev member may be used
664 * @filp: only f_mode and f_flags may be used
668 * Note: may block (uninterruptible) if error recovery is underway
671 static int sd_release(struct inode
*inode
, struct file
*filp
)
673 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
674 struct scsi_disk
*sdkp
= scsi_disk(disk
);
675 struct scsi_device
*sdev
= sdkp
->device
;
677 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
679 if (!--sdkp
->openers
&& sdev
->removable
) {
680 if (scsi_block_when_processing_errors(sdev
))
681 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
685 * XXX and what if there are packets in flight and this close()
686 * XXX is followed by a "rmmod sd_mod"?
692 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
694 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
695 struct scsi_device
*sdp
= sdkp
->device
;
696 struct Scsi_Host
*host
= sdp
->host
;
699 /* default to most commonly used values */
700 diskinfo
[0] = 0x40; /* 1 << 6 */
701 diskinfo
[1] = 0x20; /* 1 << 5 */
702 diskinfo
[2] = sdkp
->capacity
>> 11;
704 /* override with calculated, extended default, or driver values */
705 if (host
->hostt
->bios_param
)
706 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
708 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
710 geo
->heads
= diskinfo
[0];
711 geo
->sectors
= diskinfo
[1];
712 geo
->cylinders
= diskinfo
[2];
717 * sd_ioctl - process an ioctl
718 * @inode: only i_rdev/i_bdev members may be used
719 * @filp: only f_mode and f_flags may be used
720 * @cmd: ioctl command number
721 * @arg: this is third argument given to ioctl(2) system call.
722 * Often contains a pointer.
724 * Returns 0 if successful (some ioctls return postive numbers on
725 * success as well). Returns a negated errno value in case of error.
727 * Note: most ioctls are forward onto the block subsystem or further
728 * down in the scsi subsystem.
730 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
731 unsigned int cmd
, unsigned long arg
)
733 struct block_device
*bdev
= inode
->i_bdev
;
734 struct gendisk
*disk
= bdev
->bd_disk
;
735 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
736 void __user
*p
= (void __user
*)arg
;
739 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
740 disk
->disk_name
, cmd
));
743 * If we are in the middle of error recovery, don't let anyone
744 * else try and use this device. Also, if error recovery fails, it
745 * may try and take the device offline, in which case all further
746 * access to the device is prohibited.
748 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
749 if (!scsi_block_when_processing_errors(sdp
) || !error
)
753 * Send SCSI addressing ioctls directly to mid level, send other
754 * ioctls to block level and then onto mid level if they can't be
758 case SCSI_IOCTL_GET_IDLUN
:
759 case SCSI_IOCTL_GET_BUS_NUMBER
:
760 return scsi_ioctl(sdp
, cmd
, p
);
762 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
763 if (error
!= -ENOTTY
)
766 return scsi_ioctl(sdp
, cmd
, p
);
769 static void set_media_not_present(struct scsi_disk
*sdkp
)
771 sdkp
->media_present
= 0;
773 sdkp
->device
->changed
= 1;
777 * sd_media_changed - check if our medium changed
778 * @disk: kernel device descriptor
780 * Returns 0 if not applicable or no change; 1 if change
782 * Note: this function is invoked from the block subsystem.
784 static int sd_media_changed(struct gendisk
*disk
)
786 struct scsi_disk
*sdkp
= scsi_disk(disk
);
787 struct scsi_device
*sdp
= sdkp
->device
;
788 struct scsi_sense_hdr
*sshdr
= NULL
;
791 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
797 * If the device is offline, don't send any commands - just pretend as
798 * if the command failed. If the device ever comes back online, we
799 * can deal with it then. It is only because of unrecoverable errors
800 * that we would ever take a device offline in the first place.
802 if (!scsi_device_online(sdp
)) {
803 set_media_not_present(sdkp
);
809 * Using TEST_UNIT_READY enables differentiation between drive with
810 * no cartridge loaded - NOT READY, drive with changed cartridge -
811 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
813 * Drives that auto spin down. eg iomega jaz 1G, will be started
814 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
815 * sd_revalidate() is called.
819 if (scsi_block_when_processing_errors(sdp
)) {
820 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
821 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
826 * Unable to test, unit probably not ready. This usually
827 * means there is no disc in the drive. Mark as changed,
828 * and we will figure it out later once the drive is
831 if (retval
|| (scsi_sense_valid(sshdr
) &&
832 /* 0x3a is medium not present */
833 sshdr
->asc
== 0x3a)) {
834 set_media_not_present(sdkp
);
840 * For removable scsi disk we have to recognise the presence
841 * of a disk in the drive. This is kept in the struct scsi_disk
842 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
844 sdkp
->media_present
= 1;
846 retval
= sdp
->changed
;
849 if (retval
!= sdkp
->previous_state
)
850 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
851 sdkp
->previous_state
= retval
;
856 static int sd_sync_cache(struct scsi_disk
*sdkp
)
859 struct scsi_device
*sdp
= sdkp
->device
;
860 struct scsi_sense_hdr sshdr
;
862 if (!scsi_device_online(sdp
))
866 for (retries
= 3; retries
> 0; --retries
) {
867 unsigned char cmd
[10] = { 0 };
869 cmd
[0] = SYNCHRONIZE_CACHE
;
871 * Leave the rest of the command zero to indicate
874 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
875 SD_TIMEOUT
, SD_MAX_RETRIES
);
881 sd_print_result(sdkp
, res
);
882 if (driver_byte(res
) & DRIVER_SENSE
)
883 sd_print_sense_hdr(sdkp
, &sshdr
);
891 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
893 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
894 rq
->timeout
= SD_TIMEOUT
;
895 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
899 static void sd_rescan(struct device
*dev
)
901 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
904 sd_revalidate_disk(sdkp
->disk
);
912 * This gets directly called from VFS. When the ioctl
913 * is not recognized we go back to the other translation paths.
915 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
917 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
918 struct gendisk
*disk
= bdev
->bd_disk
;
919 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
922 * If we are in the middle of error recovery, don't let anyone
923 * else try and use this device. Also, if error recovery fails, it
924 * may try and take the device offline, in which case all further
925 * access to the device is prohibited.
927 if (!scsi_block_when_processing_errors(sdev
))
930 if (sdev
->host
->hostt
->compat_ioctl
) {
933 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
939 * Let the static ioctl translation table take care of it.
945 static struct block_device_operations sd_fops
= {
946 .owner
= THIS_MODULE
,
948 .release
= sd_release
,
952 .compat_ioctl
= sd_compat_ioctl
,
954 .media_changed
= sd_media_changed
,
955 .revalidate_disk
= sd_revalidate_disk
,
958 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
960 u64 start_lba
= scmd
->request
->sector
;
961 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
965 if (!blk_fs_request(scmd
->request
))
968 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
969 SCSI_SENSE_BUFFERSIZE
,
974 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
977 if (scmd
->device
->sector_size
< 512) {
978 /* only legitimate sector_size here is 256 */
982 /* be careful ... don't want any overflows */
983 u64 factor
= scmd
->device
->sector_size
/ 512;
984 do_div(start_lba
, factor
);
985 do_div(end_lba
, factor
);
988 /* The bad lba was reported incorrectly, we have no idea where
991 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
994 /* This computation should always be done in terms of
995 * the resolution of the device's medium.
997 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1001 * sd_done - bottom half handler: called when the lower level
1002 * driver has completed (successfully or otherwise) a scsi command.
1003 * @SCpnt: mid-level's per command structure.
1005 * Note: potentially run from within an ISR. Must not block.
1007 static int sd_done(struct scsi_cmnd
*SCpnt
)
1009 int result
= SCpnt
->result
;
1010 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1011 struct scsi_sense_hdr sshdr
;
1012 int sense_valid
= 0;
1013 int sense_deferred
= 0;
1016 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1018 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1020 #ifdef CONFIG_SCSI_LOGGING
1021 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1023 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1024 "sd_done: sb[respc,sk,asc,"
1025 "ascq]=%x,%x,%x,%x\n",
1026 sshdr
.response_code
,
1027 sshdr
.sense_key
, sshdr
.asc
,
1031 if (driver_byte(result
) != DRIVER_SENSE
&&
1032 (!sense_valid
|| sense_deferred
))
1035 switch (sshdr
.sense_key
) {
1036 case HARDWARE_ERROR
:
1038 good_bytes
= sd_completed_bytes(SCpnt
);
1040 case RECOVERED_ERROR
:
1042 /* Inform the user, but make sure that it's not treated
1045 scsi_print_sense("sd", SCpnt
);
1047 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1048 good_bytes
= scsi_bufflen(SCpnt
);
1050 case ABORTED_COMMAND
:
1051 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1052 scsi_print_result(SCpnt
);
1053 scsi_print_sense("sd", SCpnt
);
1054 good_bytes
= sd_completed_bytes(SCpnt
);
1057 case ILLEGAL_REQUEST
:
1058 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1059 scsi_print_result(SCpnt
);
1060 scsi_print_sense("sd", SCpnt
);
1061 good_bytes
= sd_completed_bytes(SCpnt
);
1063 if (!scsi_device_protection(SCpnt
->device
) &&
1064 SCpnt
->device
->use_10_for_rw
&&
1065 (SCpnt
->cmnd
[0] == READ_10
||
1066 SCpnt
->cmnd
[0] == WRITE_10
))
1067 SCpnt
->device
->use_10_for_rw
= 0;
1068 if (SCpnt
->device
->use_10_for_ms
&&
1069 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1070 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1071 SCpnt
->device
->use_10_for_ms
= 0;
1077 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1078 sd_dif_complete(SCpnt
, good_bytes
);
1083 static int media_not_present(struct scsi_disk
*sdkp
,
1084 struct scsi_sense_hdr
*sshdr
)
1087 if (!scsi_sense_valid(sshdr
))
1089 /* not invoked for commands that could return deferred errors */
1090 if (sshdr
->sense_key
!= NOT_READY
&&
1091 sshdr
->sense_key
!= UNIT_ATTENTION
)
1093 if (sshdr
->asc
!= 0x3A) /* medium not present */
1096 set_media_not_present(sdkp
);
1101 * spinup disk - called only in sd_revalidate_disk()
1104 sd_spinup_disk(struct scsi_disk
*sdkp
)
1106 unsigned char cmd
[10];
1107 unsigned long spintime_expire
= 0;
1108 int retries
, spintime
;
1109 unsigned int the_result
;
1110 struct scsi_sense_hdr sshdr
;
1111 int sense_valid
= 0;
1115 /* Spin up drives, as required. Only do this at boot time */
1116 /* Spinup needs to be done for module loads too. */
1121 cmd
[0] = TEST_UNIT_READY
;
1122 memset((void *) &cmd
[1], 0, 9);
1124 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1130 * If the drive has indicated to us that it
1131 * doesn't have any media in it, don't bother
1132 * with any more polling.
1134 if (media_not_present(sdkp
, &sshdr
))
1138 sense_valid
= scsi_sense_valid(&sshdr
);
1140 } while (retries
< 3 &&
1141 (!scsi_status_is_good(the_result
) ||
1142 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1143 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1145 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1146 /* no sense, TUR either succeeded or failed
1147 * with a status error */
1148 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1149 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1150 sd_print_result(sdkp
, the_result
);
1156 * The device does not want the automatic start to be issued.
1158 if (sdkp
->device
->no_start_on_add
) {
1163 * If manual intervention is required, or this is an
1164 * absent USB storage device, a spinup is meaningless.
1167 sshdr
.sense_key
== NOT_READY
&&
1168 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1169 break; /* manual intervention required */
1172 * Issue command to spin up drive when not ready
1174 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1176 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1177 cmd
[0] = START_STOP
;
1178 cmd
[1] = 1; /* Return immediately */
1179 memset((void *) &cmd
[2], 0, 8);
1180 cmd
[4] = 1; /* Start spin cycle */
1181 if (sdkp
->device
->start_stop_pwr_cond
)
1183 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1185 SD_TIMEOUT
, SD_MAX_RETRIES
);
1186 spintime_expire
= jiffies
+ 100 * HZ
;
1189 /* Wait 1 second for next try */
1194 * Wait for USB flash devices with slow firmware.
1195 * Yes, this sense key/ASC combination shouldn't
1196 * occur here. It's characteristic of these devices.
1198 } else if (sense_valid
&&
1199 sshdr
.sense_key
== UNIT_ATTENTION
&&
1200 sshdr
.asc
== 0x28) {
1202 spintime_expire
= jiffies
+ 5 * HZ
;
1205 /* Wait 1 second for next try */
1208 /* we don't understand the sense code, so it's
1209 * probably pointless to loop */
1211 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1212 sd_print_sense_hdr(sdkp
, &sshdr
);
1217 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1220 if (scsi_status_is_good(the_result
))
1223 printk("not responding...\n");
1229 * Determine whether disk supports Data Integrity Field.
1231 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1233 struct scsi_device
*sdp
= sdkp
->device
;
1236 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1239 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1242 case SD_DIF_TYPE0_PROTECTION
:
1243 sdkp
->protection_type
= 0;
1246 case SD_DIF_TYPE1_PROTECTION
:
1247 case SD_DIF_TYPE3_PROTECTION
:
1248 sdkp
->protection_type
= type
;
1251 case SD_DIF_TYPE2_PROTECTION
:
1252 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1253 "protection which is currently unsupported. " \
1254 "Disabling disk!\n");
1258 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1259 "protection type %d. Disabling disk!\n", type
);
1266 sdkp
->protection_type
= 0;
1271 * read disk capacity
1274 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1276 unsigned char cmd
[16];
1277 int the_result
, retries
;
1278 int sector_size
= 0;
1279 /* Force READ CAPACITY(16) when PROTECT=1 */
1280 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1281 struct scsi_sense_hdr sshdr
;
1282 int sense_valid
= 0;
1283 struct scsi_device
*sdp
= sdkp
->device
;
1289 memset((void *) cmd
, 0, 16);
1290 cmd
[0] = SERVICE_ACTION_IN
;
1291 cmd
[1] = SAI_READ_CAPACITY_16
;
1293 memset((void *) buffer
, 0, 13);
1295 cmd
[0] = READ_CAPACITY
;
1296 memset((void *) &cmd
[1], 0, 9);
1297 memset((void *) buffer
, 0, 8);
1300 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1301 buffer
, longrc
? 13 : 8, &sshdr
,
1302 SD_TIMEOUT
, SD_MAX_RETRIES
);
1304 if (media_not_present(sdkp
, &sshdr
))
1308 sense_valid
= scsi_sense_valid(&sshdr
);
1311 } while (the_result
&& retries
);
1313 if (the_result
&& !longrc
) {
1314 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1315 sd_print_result(sdkp
, the_result
);
1316 if (driver_byte(the_result
) & DRIVER_SENSE
)
1317 sd_print_sense_hdr(sdkp
, &sshdr
);
1319 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1321 /* Set dirty bit for removable devices if not ready -
1322 * sometimes drives will not report this properly. */
1323 if (sdp
->removable
&&
1324 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1327 /* Either no media are present but the drive didn't tell us,
1328 or they are present but the read capacity command fails */
1329 /* sdkp->media_present = 0; -- not always correct */
1330 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1333 } else if (the_result
&& longrc
) {
1334 /* READ CAPACITY(16) has been failed */
1335 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1336 sd_print_result(sdkp
, the_result
);
1337 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1339 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1344 sector_size
= (buffer
[4] << 24) |
1345 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1346 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1347 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1348 if(sizeof(sdkp
->capacity
) > 4) {
1349 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1350 "Trying to use READ CAPACITY(16).\n");
1354 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1355 "a kernel compiled with support for large "
1356 "block devices.\n");
1360 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1365 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1366 ((u64
)buffer
[1] << 48) |
1367 ((u64
)buffer
[2] << 40) |
1368 ((u64
)buffer
[3] << 32) |
1369 ((sector_t
)buffer
[4] << 24) |
1370 ((sector_t
)buffer
[5] << 16) |
1371 ((sector_t
)buffer
[6] << 8) |
1372 (sector_t
)buffer
[7]);
1374 sector_size
= (buffer
[8] << 24) |
1375 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1377 sd_read_protection_type(sdkp
, buffer
);
1380 /* Some devices return the total number of sectors, not the
1381 * highest sector number. Make the necessary adjustment. */
1382 if (sdp
->fix_capacity
) {
1385 /* Some devices have version which report the correct sizes
1386 * and others which do not. We guess size according to a heuristic
1387 * and err on the side of lowering the capacity. */
1389 if (sdp
->guess_capacity
)
1390 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1395 if (sector_size
== 0) {
1397 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1401 if (sector_size
!= 512 &&
1402 sector_size
!= 1024 &&
1403 sector_size
!= 2048 &&
1404 sector_size
!= 4096 &&
1405 sector_size
!= 256) {
1406 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1409 * The user might want to re-format the drive with
1410 * a supported sectorsize. Once this happens, it
1411 * would be relatively trivial to set the thing up.
1412 * For this reason, we leave the thing in the table.
1416 * set a bogus sector size so the normal read/write
1417 * logic in the block layer will eventually refuse any
1418 * request on this device without tripping over power
1419 * of two sector size assumptions
1425 * The msdos fs needs to know the hardware sector size
1426 * So I have created this table. See ll_rw_blk.c
1427 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1429 int hard_sector
= sector_size
;
1430 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1431 struct request_queue
*queue
= sdp
->request_queue
;
1434 blk_queue_hardsect_size(queue
, hard_sector
);
1435 /* avoid 64-bit division on 32-bit platforms */
1436 sector_div(sz
, 625);
1438 sector_div(mb
, 1950);
1440 sd_printk(KERN_NOTICE
, sdkp
,
1441 "%llu %d-byte hardware sectors (%llu MB)\n",
1442 (unsigned long long)sdkp
->capacity
,
1443 hard_sector
, (unsigned long long)mb
);
1446 /* Rescale capacity to 512-byte units */
1447 if (sector_size
== 4096)
1448 sdkp
->capacity
<<= 3;
1449 else if (sector_size
== 2048)
1450 sdkp
->capacity
<<= 2;
1451 else if (sector_size
== 1024)
1452 sdkp
->capacity
<<= 1;
1453 else if (sector_size
== 256)
1454 sdkp
->capacity
>>= 1;
1456 sdkp
->device
->sector_size
= sector_size
;
1459 /* called with buffer of length 512 */
1461 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1462 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1463 struct scsi_sense_hdr
*sshdr
)
1465 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1466 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1471 * read write protect setting, if possible - called only in sd_revalidate_disk()
1472 * called with buffer of length SD_BUF_SIZE
1475 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1478 struct scsi_device
*sdp
= sdkp
->device
;
1479 struct scsi_mode_data data
;
1481 set_disk_ro(sdkp
->disk
, 0);
1482 if (sdp
->skip_ms_page_3f
) {
1483 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1487 if (sdp
->use_192_bytes_for_3f
) {
1488 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1491 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1492 * We have to start carefully: some devices hang if we ask
1493 * for more than is available.
1495 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1498 * Second attempt: ask for page 0 When only page 0 is
1499 * implemented, a request for page 3F may return Sense Key
1500 * 5: Illegal Request, Sense Code 24: Invalid field in
1503 if (!scsi_status_is_good(res
))
1504 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1507 * Third attempt: ask 255 bytes, as we did earlier.
1509 if (!scsi_status_is_good(res
))
1510 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1514 if (!scsi_status_is_good(res
)) {
1515 sd_printk(KERN_WARNING
, sdkp
,
1516 "Test WP failed, assume Write Enabled\n");
1518 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1519 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1520 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1521 sdkp
->write_prot
? "on" : "off");
1522 sd_printk(KERN_DEBUG
, sdkp
,
1523 "Mode Sense: %02x %02x %02x %02x\n",
1524 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1529 * sd_read_cache_type - called only from sd_revalidate_disk()
1530 * called with buffer of length SD_BUF_SIZE
1533 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1536 struct scsi_device
*sdp
= sdkp
->device
;
1540 struct scsi_mode_data data
;
1541 struct scsi_sense_hdr sshdr
;
1543 if (sdp
->skip_ms_page_8
)
1546 if (sdp
->type
== TYPE_RBC
) {
1554 /* cautiously ask */
1555 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1557 if (!scsi_status_is_good(res
))
1560 if (!data
.header_length
) {
1562 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1565 /* that went OK, now ask for the proper length */
1569 * We're only interested in the first three bytes, actually.
1570 * But the data cache page is defined for the first 20.
1577 /* Take headers and block descriptors into account */
1578 len
+= data
.header_length
+ data
.block_descriptor_length
;
1579 if (len
> SD_BUF_SIZE
)
1583 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1585 if (scsi_status_is_good(res
)) {
1586 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1588 if (offset
>= SD_BUF_SIZE
- 2) {
1589 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1593 if ((buffer
[offset
] & 0x3f) != modepage
) {
1594 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1598 if (modepage
== 8) {
1599 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1600 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1602 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1606 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1607 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1608 sd_printk(KERN_NOTICE
, sdkp
,
1609 "Uses READ/WRITE(6), disabling FUA\n");
1613 sd_printk(KERN_NOTICE
, sdkp
,
1614 "Write cache: %s, read cache: %s, %s\n",
1615 sdkp
->WCE
? "enabled" : "disabled",
1616 sdkp
->RCD
? "disabled" : "enabled",
1617 sdkp
->DPOFUA
? "supports DPO and FUA"
1618 : "doesn't support DPO or FUA");
1624 if (scsi_sense_valid(&sshdr
) &&
1625 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1626 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1627 /* Invalid field in CDB */
1628 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1630 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1633 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1640 * The ATO bit indicates whether the DIF application tag is available
1641 * for use by the operating system.
1643 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1646 struct scsi_device
*sdp
= sdkp
->device
;
1647 struct scsi_mode_data data
;
1648 struct scsi_sense_hdr sshdr
;
1650 if (sdp
->type
!= TYPE_DISK
)
1653 if (sdkp
->protection_type
== 0)
1656 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1657 SD_MAX_RETRIES
, &data
, &sshdr
);
1659 if (!scsi_status_is_good(res
) || !data
.header_length
||
1661 sd_printk(KERN_WARNING
, sdkp
,
1662 "getting Control mode page failed, assume no ATO\n");
1664 if (scsi_sense_valid(&sshdr
))
1665 sd_print_sense_hdr(sdkp
, &sshdr
);
1670 offset
= data
.header_length
+ data
.block_descriptor_length
;
1672 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1673 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1677 if ((buffer
[offset
+ 5] & 0x80) == 0)
1686 * sd_revalidate_disk - called the first time a new disk is seen,
1687 * performs disk spin up, read_capacity, etc.
1688 * @disk: struct gendisk we care about
1690 static int sd_revalidate_disk(struct gendisk
*disk
)
1692 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1693 struct scsi_device
*sdp
= sdkp
->device
;
1694 unsigned char *buffer
;
1697 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1698 "sd_revalidate_disk\n"));
1701 * If the device is offline, don't try and read capacity or any
1702 * of the other niceties.
1704 if (!scsi_device_online(sdp
))
1707 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1709 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1710 "allocation failure.\n");
1714 /* defaults, until the device tells us otherwise */
1715 sdp
->sector_size
= 512;
1717 sdkp
->media_present
= 1;
1718 sdkp
->write_prot
= 0;
1723 sd_spinup_disk(sdkp
);
1726 * Without media there is no reason to ask; moreover, some devices
1727 * react badly if we do.
1729 if (sdkp
->media_present
) {
1730 sd_read_capacity(sdkp
, buffer
);
1731 sd_read_write_protect_flag(sdkp
, buffer
);
1732 sd_read_cache_type(sdkp
, buffer
);
1733 sd_read_app_tag_own(sdkp
, buffer
);
1737 * We now have all cache related info, determine how we deal
1738 * with ordered requests. Note that as the current SCSI
1739 * dispatch function can alter request order, we cannot use
1740 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1743 ordered
= sdkp
->DPOFUA
1744 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1746 ordered
= QUEUE_ORDERED_DRAIN
;
1748 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1750 set_capacity(disk
, sdkp
->capacity
);
1758 * sd_probe - called during driver initialization and whenever a
1759 * new scsi device is attached to the system. It is called once
1760 * for each scsi device (not just disks) present.
1761 * @dev: pointer to device object
1763 * Returns 0 if successful (or not interested in this scsi device
1764 * (e.g. scanner)); 1 when there is an error.
1766 * Note: this function is invoked from the scsi mid-level.
1767 * This function sets up the mapping between a given
1768 * <host,channel,id,lun> (found in sdp) and new device name
1769 * (e.g. /dev/sda). More precisely it is the block device major
1770 * and minor number that is chosen here.
1772 * Assume sd_attach is not re-entrant (for time being)
1773 * Also think about sd_attach() and sd_remove() running coincidentally.
1775 static int sd_probe(struct device
*dev
)
1777 struct scsi_device
*sdp
= to_scsi_device(dev
);
1778 struct scsi_disk
*sdkp
;
1784 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1787 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1791 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1795 gd
= alloc_disk(16);
1800 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1803 error
= ida_get_new(&sd_index_ida
, &index
);
1804 } while (error
== -EAGAIN
);
1810 if (index
>= SD_MAX_DISKS
)
1811 goto out_free_index
;
1814 sdkp
->driver
= &sd_template
;
1816 sdkp
->index
= index
;
1818 sdkp
->previous_state
= 1;
1820 if (!sdp
->timeout
) {
1821 if (sdp
->type
!= TYPE_MOD
)
1822 sdp
->timeout
= SD_TIMEOUT
;
1824 sdp
->timeout
= SD_MOD_TIMEOUT
;
1827 device_initialize(&sdkp
->dev
);
1828 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1829 sdkp
->dev
.class = &sd_disk_class
;
1830 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1832 if (device_add(&sdkp
->dev
))
1833 goto out_free_index
;
1835 get_device(&sdp
->sdev_gendev
);
1837 gd
->major
= sd_major((index
& 0xf0) >> 4);
1838 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1840 gd
->fops
= &sd_fops
;
1843 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1844 } else if (index
< (26 + 1) * 26) {
1845 sprintf(gd
->disk_name
, "sd%c%c",
1846 'a' + index
/ 26 - 1,'a' + index
% 26);
1848 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1849 const unsigned int m2
= (index
/ 26 - 1) % 26;
1850 const unsigned int m3
= index
% 26;
1851 sprintf(gd
->disk_name
, "sd%c%c%c",
1852 'a' + m1
, 'a' + m2
, 'a' + m3
);
1855 gd
->private_data
= &sdkp
->driver
;
1856 gd
->queue
= sdkp
->device
->request_queue
;
1858 sd_revalidate_disk(gd
);
1860 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1862 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1863 gd
->flags
= GENHD_FL_DRIVERFS
;
1865 gd
->flags
|= GENHD_FL_REMOVABLE
;
1867 dev_set_drvdata(dev
, sdkp
);
1869 sd_dif_config_host(sdkp
);
1871 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1872 sdp
->removable
? "removable " : "");
1877 ida_remove(&sd_index_ida
, index
);
1887 * sd_remove - called whenever a scsi disk (previously recognized by
1888 * sd_probe) is detached from the system. It is called (potentially
1889 * multiple times) during sd module unload.
1890 * @sdp: pointer to mid level scsi device object
1892 * Note: this function is invoked from the scsi mid-level.
1893 * This function potentially frees up a device name (e.g. /dev/sdc)
1894 * that could be re-used by a subsequent sd_probe().
1895 * This function is not called when the built-in sd driver is "exit-ed".
1897 static int sd_remove(struct device
*dev
)
1899 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1901 device_del(&sdkp
->dev
);
1902 del_gendisk(sdkp
->disk
);
1905 mutex_lock(&sd_ref_mutex
);
1906 dev_set_drvdata(dev
, NULL
);
1907 put_device(&sdkp
->dev
);
1908 mutex_unlock(&sd_ref_mutex
);
1914 * scsi_disk_release - Called to free the scsi_disk structure
1915 * @dev: pointer to embedded class device
1917 * sd_ref_mutex must be held entering this routine. Because it is
1918 * called on last put, you should always use the scsi_disk_get()
1919 * scsi_disk_put() helpers which manipulate the semaphore directly
1920 * and never do a direct put_device.
1922 static void scsi_disk_release(struct device
*dev
)
1924 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1925 struct gendisk
*disk
= sdkp
->disk
;
1927 ida_remove(&sd_index_ida
, sdkp
->index
);
1929 disk
->private_data
= NULL
;
1931 put_device(&sdkp
->device
->sdev_gendev
);
1936 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1938 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1939 struct scsi_sense_hdr sshdr
;
1940 struct scsi_device
*sdp
= sdkp
->device
;
1944 cmd
[4] |= 1; /* START */
1946 if (sdp
->start_stop_pwr_cond
)
1947 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1949 if (!scsi_device_online(sdp
))
1952 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1953 SD_TIMEOUT
, SD_MAX_RETRIES
);
1955 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1956 sd_print_result(sdkp
, res
);
1957 if (driver_byte(res
) & DRIVER_SENSE
)
1958 sd_print_sense_hdr(sdkp
, &sshdr
);
1965 * Send a SYNCHRONIZE CACHE instruction down to the device through
1966 * the normal SCSI command structure. Wait for the command to
1969 static void sd_shutdown(struct device
*dev
)
1971 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1974 return; /* this can happen */
1977 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1978 sd_sync_cache(sdkp
);
1981 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1982 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1983 sd_start_stop_device(sdkp
, 0);
1986 scsi_disk_put(sdkp
);
1989 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1991 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1995 return 0; /* this can happen */
1998 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1999 ret
= sd_sync_cache(sdkp
);
2004 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2005 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2006 ret
= sd_start_stop_device(sdkp
, 0);
2010 scsi_disk_put(sdkp
);
2014 static int sd_resume(struct device
*dev
)
2016 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2019 if (!sdkp
->device
->manage_start_stop
)
2022 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2023 ret
= sd_start_stop_device(sdkp
, 1);
2026 scsi_disk_put(sdkp
);
2031 * init_sd - entry point for this driver (both when built in or when
2034 * Note: this function registers this driver with the scsi mid-level.
2036 static int __init
init_sd(void)
2038 int majors
= 0, i
, err
;
2040 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2042 for (i
= 0; i
< SD_MAJORS
; i
++)
2043 if (register_blkdev(sd_major(i
), "sd") == 0)
2049 err
= class_register(&sd_disk_class
);
2053 err
= scsi_register_driver(&sd_template
.gendrv
);
2060 class_unregister(&sd_disk_class
);
2062 for (i
= 0; i
< SD_MAJORS
; i
++)
2063 unregister_blkdev(sd_major(i
), "sd");
2068 * exit_sd - exit point for this driver (when it is a module).
2070 * Note: this function unregisters this driver from the scsi mid-level.
2072 static void __exit
exit_sd(void)
2076 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2078 scsi_unregister_driver(&sd_template
.gendrv
);
2079 class_unregister(&sd_disk_class
);
2081 for (i
= 0; i
< SD_MAJORS
; i
++)
2082 unregister_blkdev(sd_major(i
), "sd");
2085 module_init(init_sd
);
2086 module_exit(exit_sd
);
2088 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2089 struct scsi_sense_hdr
*sshdr
)
2091 sd_printk(KERN_INFO
, sdkp
, "");
2092 scsi_show_sense_hdr(sshdr
);
2093 sd_printk(KERN_INFO
, sdkp
, "");
2094 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2097 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2099 sd_printk(KERN_INFO
, sdkp
, "");
2100 scsi_show_result(result
);