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_IDR(sd_index_idr
);
103 static DEFINE_SPINLOCK(sd_index_lock
);
105 /* This semaphore is used to mediate the 0->1 reference get in the
106 * face of object destruction (i.e. we can't allow a get on an
107 * object after last put) */
108 static DEFINE_MUTEX(sd_ref_mutex
);
110 static const char *sd_cache_types
[] = {
111 "write through", "none", "write back",
112 "write back, no read (daft)"
116 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
117 const char *buf
, size_t count
)
119 int i
, ct
= -1, rcd
, wce
, sp
;
120 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
121 struct scsi_device
*sdp
= sdkp
->device
;
124 struct scsi_mode_data data
;
125 struct scsi_sense_hdr sshdr
;
128 if (sdp
->type
!= TYPE_DISK
)
129 /* no cache control on RBC devices; theoretically they
130 * can do it, but there's probably so many exceptions
131 * it's not worth the risk */
134 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
135 const int len
= strlen(sd_cache_types
[i
]);
136 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
144 rcd
= ct
& 0x01 ? 1 : 0;
145 wce
= ct
& 0x02 ? 1 : 0;
146 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
147 SD_MAX_RETRIES
, &data
, NULL
))
149 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
150 data
.block_descriptor_length
);
151 buffer_data
= buffer
+ data
.header_length
+
152 data
.block_descriptor_length
;
153 buffer_data
[2] &= ~0x05;
154 buffer_data
[2] |= wce
<< 2 | rcd
;
155 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
157 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
158 SD_MAX_RETRIES
, &data
, &sshdr
)) {
159 if (scsi_sense_valid(&sshdr
))
160 sd_print_sense_hdr(sdkp
, &sshdr
);
163 sd_revalidate_disk(sdkp
->disk
);
168 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
169 const char *buf
, size_t count
)
171 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
172 struct scsi_device
*sdp
= sdkp
->device
;
174 if (!capable(CAP_SYS_ADMIN
))
177 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
183 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
184 const char *buf
, size_t count
)
186 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
187 struct scsi_device
*sdp
= sdkp
->device
;
189 if (!capable(CAP_SYS_ADMIN
))
192 if (sdp
->type
!= TYPE_DISK
)
195 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
201 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
204 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
205 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
207 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
211 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
213 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
215 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
219 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
222 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
223 struct scsi_device
*sdp
= sdkp
->device
;
225 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
229 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
232 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
234 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
237 static struct device_attribute sd_disk_attrs
[] = {
238 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
239 sd_store_cache_type
),
240 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
241 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
242 sd_store_allow_restart
),
243 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
244 sd_store_manage_start_stop
),
248 static struct class sd_disk_class
= {
250 .owner
= THIS_MODULE
,
251 .dev_release
= scsi_disk_release
,
252 .dev_attrs
= sd_disk_attrs
,
255 static struct scsi_driver sd_template
= {
256 .owner
= THIS_MODULE
,
261 .suspend
= sd_suspend
,
263 .shutdown
= sd_shutdown
,
270 * Device no to disk mapping:
272 * major disc2 disc p1
273 * |............|.............|....|....| <- dev_t
276 * Inside a major, we have 16k disks, however mapped non-
277 * contiguously. The first 16 disks are for major0, the next
278 * ones with major1, ... Disk 256 is for major0 again, disk 272
280 * As we stay compatible with our numbering scheme, we can reuse
281 * the well-know SCSI majors 8, 65--71, 136--143.
283 static int sd_major(int major_idx
)
287 return SCSI_DISK0_MAJOR
;
289 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
291 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
294 return 0; /* shut up gcc */
298 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
300 struct scsi_disk
*sdkp
= NULL
;
302 if (disk
->private_data
) {
303 sdkp
= scsi_disk(disk
);
304 if (scsi_device_get(sdkp
->device
) == 0)
305 get_device(&sdkp
->dev
);
312 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
314 struct scsi_disk
*sdkp
;
316 mutex_lock(&sd_ref_mutex
);
317 sdkp
= __scsi_disk_get(disk
);
318 mutex_unlock(&sd_ref_mutex
);
322 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
324 struct scsi_disk
*sdkp
;
326 mutex_lock(&sd_ref_mutex
);
327 sdkp
= dev_get_drvdata(dev
);
329 sdkp
= __scsi_disk_get(sdkp
->disk
);
330 mutex_unlock(&sd_ref_mutex
);
334 static void scsi_disk_put(struct scsi_disk
*sdkp
)
336 struct scsi_device
*sdev
= sdkp
->device
;
338 mutex_lock(&sd_ref_mutex
);
339 put_device(&sdkp
->dev
);
340 scsi_device_put(sdev
);
341 mutex_unlock(&sd_ref_mutex
);
345 * sd_init_command - build a scsi (read or write) command from
346 * information in the request structure.
347 * @SCpnt: pointer to mid-level's per scsi command structure that
348 * contains request and into which the scsi command is written
350 * Returns 1 if successful and 0 if error (or cannot be done now).
352 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
354 struct scsi_cmnd
*SCpnt
;
355 struct scsi_device
*sdp
= q
->queuedata
;
356 struct gendisk
*disk
= rq
->rq_disk
;
357 sector_t block
= rq
->sector
;
358 unsigned int this_count
= rq
->nr_sectors
;
359 unsigned int timeout
= sdp
->timeout
;
362 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
363 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
365 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
369 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
370 if (ret
!= BLKPREP_OK
)
374 /* from here on until we're complete, any goto out
375 * is used for a killable error condition */
378 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
379 "sd_init_command: block=%llu, "
381 (unsigned long long)block
,
384 if (!sdp
|| !scsi_device_online(sdp
) ||
385 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
386 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
387 "Finishing %ld sectors\n",
389 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
390 "Retry with 0x%p\n", SCpnt
));
396 * quietly refuse to do anything to a changed disc until
397 * the changed bit has been reset
399 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
404 * Some devices (some sdcards for one) don't like it if the
405 * last sector gets read in a larger then 1 sector read.
407 if (unlikely(sdp
->last_sector_bug
&&
408 rq
->nr_sectors
> sdp
->sector_size
/ 512 &&
409 block
+ this_count
== get_capacity(disk
)))
410 this_count
-= sdp
->sector_size
/ 512;
412 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
413 (unsigned long long)block
));
416 * If we have a 1K hardware sectorsize, prevent access to single
417 * 512 byte sectors. In theory we could handle this - in fact
418 * the scsi cdrom driver must be able to handle this because
419 * we typically use 1K blocksizes, and cdroms typically have
420 * 2K hardware sectorsizes. Of course, things are simpler
421 * with the cdrom, since it is read-only. For performance
422 * reasons, the filesystems should be able to handle this
423 * and not force the scsi disk driver to use bounce buffers
426 if (sdp
->sector_size
== 1024) {
427 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
428 scmd_printk(KERN_ERR
, SCpnt
,
429 "Bad block number requested\n");
433 this_count
= this_count
>> 1;
436 if (sdp
->sector_size
== 2048) {
437 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
438 scmd_printk(KERN_ERR
, SCpnt
,
439 "Bad block number requested\n");
443 this_count
= this_count
>> 2;
446 if (sdp
->sector_size
== 4096) {
447 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
448 scmd_printk(KERN_ERR
, SCpnt
,
449 "Bad block number requested\n");
453 this_count
= this_count
>> 3;
456 if (rq_data_dir(rq
) == WRITE
) {
457 if (!sdp
->writeable
) {
460 SCpnt
->cmnd
[0] = WRITE_6
;
461 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
462 } else if (rq_data_dir(rq
) == READ
) {
463 SCpnt
->cmnd
[0] = READ_6
;
464 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
466 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
470 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
471 "%s %d/%ld 512 byte blocks.\n",
472 (rq_data_dir(rq
) == WRITE
) ?
473 "writing" : "reading", this_count
,
478 if (block
> 0xffffffff) {
479 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
480 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
481 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
482 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
483 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
484 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
485 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
486 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
487 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
488 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
489 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
490 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
491 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
492 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
493 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
494 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
495 SCpnt
->device
->use_10_for_rw
) {
496 if (this_count
> 0xffff)
499 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
500 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
501 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
502 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
503 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
504 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
505 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
506 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
507 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
509 if (unlikely(blk_fua_rq(rq
))) {
511 * This happens only if this drive failed
512 * 10byte rw command with ILLEGAL_REQUEST
513 * during operation and thus turned off
516 scmd_printk(KERN_ERR
, SCpnt
,
517 "FUA write on READ/WRITE(6) drive\n");
521 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
522 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
523 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
524 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
527 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
530 * We shouldn't disconnect in the middle of a sector, so with a dumb
531 * host adapter, it's safe to assume that we can at least transfer
532 * this many bytes between each connect / disconnect.
534 SCpnt
->transfersize
= sdp
->sector_size
;
535 SCpnt
->underflow
= this_count
<< 9;
536 SCpnt
->allowed
= SD_MAX_RETRIES
;
537 SCpnt
->timeout_per_command
= timeout
;
540 * This indicates that the command is ready from our end to be
545 return scsi_prep_return(q
, rq
, ret
);
549 * sd_open - open a scsi disk device
550 * @inode: only i_rdev member may be used
551 * @filp: only f_mode and f_flags may be used
553 * Returns 0 if successful. Returns a negated errno value in case
556 * Note: This can be called from a user context (e.g. fsck(1) )
557 * or from within the kernel (e.g. as a result of a mount(1) ).
558 * In the latter case @inode and @filp carry an abridged amount
559 * of information as noted above.
561 static int sd_open(struct inode
*inode
, struct file
*filp
)
563 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
564 struct scsi_disk
*sdkp
;
565 struct scsi_device
*sdev
;
568 if (!(sdkp
= scsi_disk_get(disk
)))
572 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
577 * If the device is in error recovery, wait until it is done.
578 * If the device is offline, then disallow any access to it.
581 if (!scsi_block_when_processing_errors(sdev
))
584 if (sdev
->removable
|| sdkp
->write_prot
)
585 check_disk_change(inode
->i_bdev
);
588 * If the drive is empty, just let the open fail.
591 if (sdev
->removable
&& !sdkp
->media_present
&&
592 !(filp
->f_flags
& O_NDELAY
))
596 * If the device has the write protect tab set, have the open fail
597 * if the user expects to be able to write to the thing.
600 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
604 * It is possible that the disk changing stuff resulted in
605 * the device being taken offline. If this is the case,
606 * report this to the user, and don't pretend that the
607 * open actually succeeded.
610 if (!scsi_device_online(sdev
))
613 if (!sdkp
->openers
++ && sdev
->removable
) {
614 if (scsi_block_when_processing_errors(sdev
))
615 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
626 * sd_release - invoked when the (last) close(2) is called on this
628 * @inode: only i_rdev member may be used
629 * @filp: only f_mode and f_flags may be used
633 * Note: may block (uninterruptible) if error recovery is underway
636 static int sd_release(struct inode
*inode
, struct file
*filp
)
638 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
639 struct scsi_disk
*sdkp
= scsi_disk(disk
);
640 struct scsi_device
*sdev
= sdkp
->device
;
642 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
644 if (!--sdkp
->openers
&& sdev
->removable
) {
645 if (scsi_block_when_processing_errors(sdev
))
646 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
650 * XXX and what if there are packets in flight and this close()
651 * XXX is followed by a "rmmod sd_mod"?
657 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
659 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
660 struct scsi_device
*sdp
= sdkp
->device
;
661 struct Scsi_Host
*host
= sdp
->host
;
664 /* default to most commonly used values */
665 diskinfo
[0] = 0x40; /* 1 << 6 */
666 diskinfo
[1] = 0x20; /* 1 << 5 */
667 diskinfo
[2] = sdkp
->capacity
>> 11;
669 /* override with calculated, extended default, or driver values */
670 if (host
->hostt
->bios_param
)
671 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
673 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
675 geo
->heads
= diskinfo
[0];
676 geo
->sectors
= diskinfo
[1];
677 geo
->cylinders
= diskinfo
[2];
682 * sd_ioctl - process an ioctl
683 * @inode: only i_rdev/i_bdev members may be used
684 * @filp: only f_mode and f_flags may be used
685 * @cmd: ioctl command number
686 * @arg: this is third argument given to ioctl(2) system call.
687 * Often contains a pointer.
689 * Returns 0 if successful (some ioctls return postive numbers on
690 * success as well). Returns a negated errno value in case of error.
692 * Note: most ioctls are forward onto the block subsystem or further
693 * down in the scsi subsystem.
695 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
696 unsigned int cmd
, unsigned long arg
)
698 struct block_device
*bdev
= inode
->i_bdev
;
699 struct gendisk
*disk
= bdev
->bd_disk
;
700 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
701 void __user
*p
= (void __user
*)arg
;
704 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
705 disk
->disk_name
, cmd
));
708 * If we are in the middle of error recovery, don't let anyone
709 * else try and use this device. Also, if error recovery fails, it
710 * may try and take the device offline, in which case all further
711 * access to the device is prohibited.
713 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
714 if (!scsi_block_when_processing_errors(sdp
) || !error
)
718 * Send SCSI addressing ioctls directly to mid level, send other
719 * ioctls to block level and then onto mid level if they can't be
723 case SCSI_IOCTL_GET_IDLUN
:
724 case SCSI_IOCTL_GET_BUS_NUMBER
:
725 return scsi_ioctl(sdp
, cmd
, p
);
727 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
728 if (error
!= -ENOTTY
)
731 return scsi_ioctl(sdp
, cmd
, p
);
734 static void set_media_not_present(struct scsi_disk
*sdkp
)
736 sdkp
->media_present
= 0;
738 sdkp
->device
->changed
= 1;
742 * sd_media_changed - check if our medium changed
743 * @disk: kernel device descriptor
745 * Returns 0 if not applicable or no change; 1 if change
747 * Note: this function is invoked from the block subsystem.
749 static int sd_media_changed(struct gendisk
*disk
)
751 struct scsi_disk
*sdkp
= scsi_disk(disk
);
752 struct scsi_device
*sdp
= sdkp
->device
;
753 struct scsi_sense_hdr
*sshdr
= NULL
;
756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
762 * If the device is offline, don't send any commands - just pretend as
763 * if the command failed. If the device ever comes back online, we
764 * can deal with it then. It is only because of unrecoverable errors
765 * that we would ever take a device offline in the first place.
767 if (!scsi_device_online(sdp
)) {
768 set_media_not_present(sdkp
);
774 * Using TEST_UNIT_READY enables differentiation between drive with
775 * no cartridge loaded - NOT READY, drive with changed cartridge -
776 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
778 * Drives that auto spin down. eg iomega jaz 1G, will be started
779 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
780 * sd_revalidate() is called.
784 if (scsi_block_when_processing_errors(sdp
)) {
785 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
786 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
791 * Unable to test, unit probably not ready. This usually
792 * means there is no disc in the drive. Mark as changed,
793 * and we will figure it out later once the drive is
796 if (retval
|| (scsi_sense_valid(sshdr
) &&
797 /* 0x3a is medium not present */
798 sshdr
->asc
== 0x3a)) {
799 set_media_not_present(sdkp
);
805 * For removable scsi disk we have to recognise the presence
806 * of a disk in the drive. This is kept in the struct scsi_disk
807 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
809 sdkp
->media_present
= 1;
811 retval
= sdp
->changed
;
814 if (retval
!= sdkp
->previous_state
)
815 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
816 sdkp
->previous_state
= retval
;
821 static int sd_sync_cache(struct scsi_disk
*sdkp
)
824 struct scsi_device
*sdp
= sdkp
->device
;
825 struct scsi_sense_hdr sshdr
;
827 if (!scsi_device_online(sdp
))
831 for (retries
= 3; retries
> 0; --retries
) {
832 unsigned char cmd
[10] = { 0 };
834 cmd
[0] = SYNCHRONIZE_CACHE
;
836 * Leave the rest of the command zero to indicate
839 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
840 SD_TIMEOUT
, SD_MAX_RETRIES
);
846 sd_print_result(sdkp
, res
);
847 if (driver_byte(res
) & DRIVER_SENSE
)
848 sd_print_sense_hdr(sdkp
, &sshdr
);
856 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
858 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
859 rq
->timeout
= SD_TIMEOUT
;
860 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
864 static void sd_rescan(struct device
*dev
)
866 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
869 sd_revalidate_disk(sdkp
->disk
);
877 * This gets directly called from VFS. When the ioctl
878 * is not recognized we go back to the other translation paths.
880 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
882 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
883 struct gendisk
*disk
= bdev
->bd_disk
;
884 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
887 * If we are in the middle of error recovery, don't let anyone
888 * else try and use this device. Also, if error recovery fails, it
889 * may try and take the device offline, in which case all further
890 * access to the device is prohibited.
892 if (!scsi_block_when_processing_errors(sdev
))
895 if (sdev
->host
->hostt
->compat_ioctl
) {
898 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
904 * Let the static ioctl translation table take care of it.
910 static struct block_device_operations sd_fops
= {
911 .owner
= THIS_MODULE
,
913 .release
= sd_release
,
917 .compat_ioctl
= sd_compat_ioctl
,
919 .media_changed
= sd_media_changed
,
920 .revalidate_disk
= sd_revalidate_disk
,
924 * sd_done - bottom half handler: called when the lower level
925 * driver has completed (successfully or otherwise) a scsi command.
926 * @SCpnt: mid-level's per command structure.
928 * Note: potentially run from within an ISR. Must not block.
930 static int sd_done(struct scsi_cmnd
*SCpnt
)
932 int result
= SCpnt
->result
;
933 unsigned int xfer_size
= scsi_bufflen(SCpnt
);
934 unsigned int good_bytes
= result
? 0 : xfer_size
;
935 u64 start_lba
= SCpnt
->request
->sector
;
936 u64 end_lba
= SCpnt
->request
->sector
+ (xfer_size
/ 512);
938 struct scsi_sense_hdr sshdr
;
940 int sense_deferred
= 0;
944 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
946 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
948 #ifdef CONFIG_SCSI_LOGGING
949 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
951 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
952 "sd_done: sb[respc,sk,asc,"
953 "ascq]=%x,%x,%x,%x\n",
955 sshdr
.sense_key
, sshdr
.asc
,
959 if (driver_byte(result
) != DRIVER_SENSE
&&
960 (!sense_valid
|| sense_deferred
))
963 switch (sshdr
.sense_key
) {
966 if (!blk_fs_request(SCpnt
->request
))
968 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
969 SCSI_SENSE_BUFFERSIZE
,
973 if (xfer_size
<= SCpnt
->device
->sector_size
)
975 if (SCpnt
->device
->sector_size
< 512) {
976 /* only legitimate sector_size here is 256 */
980 /* be careful ... don't want any overflows */
981 u64 factor
= SCpnt
->device
->sector_size
/ 512;
982 do_div(start_lba
, factor
);
983 do_div(end_lba
, factor
);
986 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
987 /* the bad lba was reported incorrectly, we have
988 * no idea where the error is
992 /* This computation should always be done in terms of
993 * the resolution of the device's medium.
995 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
997 case RECOVERED_ERROR
:
999 /* Inform the user, but make sure that it's not treated
1002 scsi_print_sense("sd", SCpnt
);
1004 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1005 good_bytes
= xfer_size
;
1007 case ILLEGAL_REQUEST
:
1008 if (SCpnt
->device
->use_10_for_rw
&&
1009 (SCpnt
->cmnd
[0] == READ_10
||
1010 SCpnt
->cmnd
[0] == WRITE_10
))
1011 SCpnt
->device
->use_10_for_rw
= 0;
1012 if (SCpnt
->device
->use_10_for_ms
&&
1013 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1014 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1015 SCpnt
->device
->use_10_for_ms
= 0;
1024 static int media_not_present(struct scsi_disk
*sdkp
,
1025 struct scsi_sense_hdr
*sshdr
)
1028 if (!scsi_sense_valid(sshdr
))
1030 /* not invoked for commands that could return deferred errors */
1031 if (sshdr
->sense_key
!= NOT_READY
&&
1032 sshdr
->sense_key
!= UNIT_ATTENTION
)
1034 if (sshdr
->asc
!= 0x3A) /* medium not present */
1037 set_media_not_present(sdkp
);
1042 * spinup disk - called only in sd_revalidate_disk()
1045 sd_spinup_disk(struct scsi_disk
*sdkp
)
1047 unsigned char cmd
[10];
1048 unsigned long spintime_expire
= 0;
1049 int retries
, spintime
;
1050 unsigned int the_result
;
1051 struct scsi_sense_hdr sshdr
;
1052 int sense_valid
= 0;
1056 /* Spin up drives, as required. Only do this at boot time */
1057 /* Spinup needs to be done for module loads too. */
1062 cmd
[0] = TEST_UNIT_READY
;
1063 memset((void *) &cmd
[1], 0, 9);
1065 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1071 * If the drive has indicated to us that it
1072 * doesn't have any media in it, don't bother
1073 * with any more polling.
1075 if (media_not_present(sdkp
, &sshdr
))
1079 sense_valid
= scsi_sense_valid(&sshdr
);
1081 } while (retries
< 3 &&
1082 (!scsi_status_is_good(the_result
) ||
1083 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1084 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1086 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1087 /* no sense, TUR either succeeded or failed
1088 * with a status error */
1089 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1090 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1091 sd_print_result(sdkp
, the_result
);
1097 * The device does not want the automatic start to be issued.
1099 if (sdkp
->device
->no_start_on_add
) {
1104 * If manual intervention is required, or this is an
1105 * absent USB storage device, a spinup is meaningless.
1108 sshdr
.sense_key
== NOT_READY
&&
1109 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1110 break; /* manual intervention required */
1113 * Issue command to spin up drive when not ready
1115 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1117 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1118 cmd
[0] = START_STOP
;
1119 cmd
[1] = 1; /* Return immediately */
1120 memset((void *) &cmd
[2], 0, 8);
1121 cmd
[4] = 1; /* Start spin cycle */
1122 if (sdkp
->device
->start_stop_pwr_cond
)
1124 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1126 SD_TIMEOUT
, SD_MAX_RETRIES
);
1127 spintime_expire
= jiffies
+ 100 * HZ
;
1130 /* Wait 1 second for next try */
1135 * Wait for USB flash devices with slow firmware.
1136 * Yes, this sense key/ASC combination shouldn't
1137 * occur here. It's characteristic of these devices.
1139 } else if (sense_valid
&&
1140 sshdr
.sense_key
== UNIT_ATTENTION
&&
1141 sshdr
.asc
== 0x28) {
1143 spintime_expire
= jiffies
+ 5 * HZ
;
1146 /* Wait 1 second for next try */
1149 /* we don't understand the sense code, so it's
1150 * probably pointless to loop */
1152 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1153 sd_print_sense_hdr(sdkp
, &sshdr
);
1158 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1161 if (scsi_status_is_good(the_result
))
1164 printk("not responding...\n");
1169 * read disk capacity
1172 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1174 unsigned char cmd
[16];
1175 int the_result
, retries
;
1176 int sector_size
= 0;
1178 struct scsi_sense_hdr sshdr
;
1179 int sense_valid
= 0;
1180 struct scsi_device
*sdp
= sdkp
->device
;
1186 memset((void *) cmd
, 0, 16);
1187 cmd
[0] = SERVICE_ACTION_IN
;
1188 cmd
[1] = SAI_READ_CAPACITY_16
;
1190 memset((void *) buffer
, 0, 12);
1192 cmd
[0] = READ_CAPACITY
;
1193 memset((void *) &cmd
[1], 0, 9);
1194 memset((void *) buffer
, 0, 8);
1197 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1198 buffer
, longrc
? 12 : 8, &sshdr
,
1199 SD_TIMEOUT
, SD_MAX_RETRIES
);
1201 if (media_not_present(sdkp
, &sshdr
))
1205 sense_valid
= scsi_sense_valid(&sshdr
);
1208 } while (the_result
&& retries
);
1210 if (the_result
&& !longrc
) {
1211 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1212 sd_print_result(sdkp
, the_result
);
1213 if (driver_byte(the_result
) & DRIVER_SENSE
)
1214 sd_print_sense_hdr(sdkp
, &sshdr
);
1216 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1218 /* Set dirty bit for removable devices if not ready -
1219 * sometimes drives will not report this properly. */
1220 if (sdp
->removable
&&
1221 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1224 /* Either no media are present but the drive didn't tell us,
1225 or they are present but the read capacity command fails */
1226 /* sdkp->media_present = 0; -- not always correct */
1227 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1230 } else if (the_result
&& longrc
) {
1231 /* READ CAPACITY(16) has been failed */
1232 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1233 sd_print_result(sdkp
, the_result
);
1234 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1236 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1241 sector_size
= (buffer
[4] << 24) |
1242 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1243 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1244 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1245 if(sizeof(sdkp
->capacity
) > 4) {
1246 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1247 "Trying to use READ CAPACITY(16).\n");
1251 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1252 "a kernel compiled with support for large "
1253 "block devices.\n");
1257 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1262 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1263 ((u64
)buffer
[1] << 48) |
1264 ((u64
)buffer
[2] << 40) |
1265 ((u64
)buffer
[3] << 32) |
1266 ((sector_t
)buffer
[4] << 24) |
1267 ((sector_t
)buffer
[5] << 16) |
1268 ((sector_t
)buffer
[6] << 8) |
1269 (sector_t
)buffer
[7]);
1271 sector_size
= (buffer
[8] << 24) |
1272 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1275 /* Some devices return the total number of sectors, not the
1276 * highest sector number. Make the necessary adjustment. */
1277 if (sdp
->fix_capacity
) {
1280 /* Some devices have version which report the correct sizes
1281 * and others which do not. We guess size according to a heuristic
1282 * and err on the side of lowering the capacity. */
1284 if (sdp
->guess_capacity
)
1285 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1290 if (sector_size
== 0) {
1292 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1296 if (sector_size
!= 512 &&
1297 sector_size
!= 1024 &&
1298 sector_size
!= 2048 &&
1299 sector_size
!= 4096 &&
1300 sector_size
!= 256) {
1301 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1304 * The user might want to re-format the drive with
1305 * a supported sectorsize. Once this happens, it
1306 * would be relatively trivial to set the thing up.
1307 * For this reason, we leave the thing in the table.
1311 * set a bogus sector size so the normal read/write
1312 * logic in the block layer will eventually refuse any
1313 * request on this device without tripping over power
1314 * of two sector size assumptions
1320 * The msdos fs needs to know the hardware sector size
1321 * So I have created this table. See ll_rw_blk.c
1322 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1324 int hard_sector
= sector_size
;
1325 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1326 struct request_queue
*queue
= sdp
->request_queue
;
1329 blk_queue_hardsect_size(queue
, hard_sector
);
1330 /* avoid 64-bit division on 32-bit platforms */
1331 sector_div(sz
, 625);
1333 sector_div(mb
, 1950);
1335 sd_printk(KERN_NOTICE
, sdkp
,
1336 "%llu %d-byte hardware sectors (%llu MB)\n",
1337 (unsigned long long)sdkp
->capacity
,
1338 hard_sector
, (unsigned long long)mb
);
1341 /* Rescale capacity to 512-byte units */
1342 if (sector_size
== 4096)
1343 sdkp
->capacity
<<= 3;
1344 else if (sector_size
== 2048)
1345 sdkp
->capacity
<<= 2;
1346 else if (sector_size
== 1024)
1347 sdkp
->capacity
<<= 1;
1348 else if (sector_size
== 256)
1349 sdkp
->capacity
>>= 1;
1351 sdkp
->device
->sector_size
= sector_size
;
1354 /* called with buffer of length 512 */
1356 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1357 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1358 struct scsi_sense_hdr
*sshdr
)
1360 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1361 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1366 * read write protect setting, if possible - called only in sd_revalidate_disk()
1367 * called with buffer of length SD_BUF_SIZE
1370 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1373 struct scsi_device
*sdp
= sdkp
->device
;
1374 struct scsi_mode_data data
;
1376 set_disk_ro(sdkp
->disk
, 0);
1377 if (sdp
->skip_ms_page_3f
) {
1378 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1382 if (sdp
->use_192_bytes_for_3f
) {
1383 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1386 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1387 * We have to start carefully: some devices hang if we ask
1388 * for more than is available.
1390 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1393 * Second attempt: ask for page 0 When only page 0 is
1394 * implemented, a request for page 3F may return Sense Key
1395 * 5: Illegal Request, Sense Code 24: Invalid field in
1398 if (!scsi_status_is_good(res
))
1399 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1402 * Third attempt: ask 255 bytes, as we did earlier.
1404 if (!scsi_status_is_good(res
))
1405 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1409 if (!scsi_status_is_good(res
)) {
1410 sd_printk(KERN_WARNING
, sdkp
,
1411 "Test WP failed, assume Write Enabled\n");
1413 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1414 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1415 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1416 sdkp
->write_prot
? "on" : "off");
1417 sd_printk(KERN_DEBUG
, sdkp
,
1418 "Mode Sense: %02x %02x %02x %02x\n",
1419 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1424 * sd_read_cache_type - called only from sd_revalidate_disk()
1425 * called with buffer of length SD_BUF_SIZE
1428 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1431 struct scsi_device
*sdp
= sdkp
->device
;
1435 struct scsi_mode_data data
;
1436 struct scsi_sense_hdr sshdr
;
1438 if (sdp
->skip_ms_page_8
)
1441 if (sdp
->type
== TYPE_RBC
) {
1449 /* cautiously ask */
1450 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1452 if (!scsi_status_is_good(res
))
1455 if (!data
.header_length
) {
1457 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1460 /* that went OK, now ask for the proper length */
1464 * We're only interested in the first three bytes, actually.
1465 * But the data cache page is defined for the first 20.
1472 /* Take headers and block descriptors into account */
1473 len
+= data
.header_length
+ data
.block_descriptor_length
;
1474 if (len
> SD_BUF_SIZE
)
1478 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1480 if (scsi_status_is_good(res
)) {
1481 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1483 if (offset
>= SD_BUF_SIZE
- 2) {
1484 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1488 if ((buffer
[offset
] & 0x3f) != modepage
) {
1489 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1493 if (modepage
== 8) {
1494 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1495 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1497 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1501 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1502 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1503 sd_printk(KERN_NOTICE
, sdkp
,
1504 "Uses READ/WRITE(6), disabling FUA\n");
1508 sd_printk(KERN_NOTICE
, sdkp
,
1509 "Write cache: %s, read cache: %s, %s\n",
1510 sdkp
->WCE
? "enabled" : "disabled",
1511 sdkp
->RCD
? "disabled" : "enabled",
1512 sdkp
->DPOFUA
? "supports DPO and FUA"
1513 : "doesn't support DPO or FUA");
1519 if (scsi_sense_valid(&sshdr
) &&
1520 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1521 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1522 /* Invalid field in CDB */
1523 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1525 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1528 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1535 * sd_revalidate_disk - called the first time a new disk is seen,
1536 * performs disk spin up, read_capacity, etc.
1537 * @disk: struct gendisk we care about
1539 static int sd_revalidate_disk(struct gendisk
*disk
)
1541 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1542 struct scsi_device
*sdp
= sdkp
->device
;
1543 unsigned char *buffer
;
1546 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1547 "sd_revalidate_disk\n"));
1550 * If the device is offline, don't try and read capacity or any
1551 * of the other niceties.
1553 if (!scsi_device_online(sdp
))
1556 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1558 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1559 "allocation failure.\n");
1563 /* defaults, until the device tells us otherwise */
1564 sdp
->sector_size
= 512;
1566 sdkp
->media_present
= 1;
1567 sdkp
->write_prot
= 0;
1571 sd_spinup_disk(sdkp
);
1574 * Without media there is no reason to ask; moreover, some devices
1575 * react badly if we do.
1577 if (sdkp
->media_present
) {
1578 sd_read_capacity(sdkp
, buffer
);
1579 sd_read_write_protect_flag(sdkp
, buffer
);
1580 sd_read_cache_type(sdkp
, buffer
);
1584 * We now have all cache related info, determine how we deal
1585 * with ordered requests. Note that as the current SCSI
1586 * dispatch function can alter request order, we cannot use
1587 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1590 ordered
= sdkp
->DPOFUA
1591 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1593 ordered
= QUEUE_ORDERED_DRAIN
;
1595 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1597 set_capacity(disk
, sdkp
->capacity
);
1605 * sd_probe - called during driver initialization and whenever a
1606 * new scsi device is attached to the system. It is called once
1607 * for each scsi device (not just disks) present.
1608 * @dev: pointer to device object
1610 * Returns 0 if successful (or not interested in this scsi device
1611 * (e.g. scanner)); 1 when there is an error.
1613 * Note: this function is invoked from the scsi mid-level.
1614 * This function sets up the mapping between a given
1615 * <host,channel,id,lun> (found in sdp) and new device name
1616 * (e.g. /dev/sda). More precisely it is the block device major
1617 * and minor number that is chosen here.
1619 * Assume sd_attach is not re-entrant (for time being)
1620 * Also think about sd_attach() and sd_remove() running coincidentally.
1622 static int sd_probe(struct device
*dev
)
1624 struct scsi_device
*sdp
= to_scsi_device(dev
);
1625 struct scsi_disk
*sdkp
;
1631 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1634 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1638 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1642 gd
= alloc_disk(16);
1646 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1649 spin_lock(&sd_index_lock
);
1650 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1651 spin_unlock(&sd_index_lock
);
1653 if (index
>= SD_MAX_DISKS
)
1659 sdkp
->driver
= &sd_template
;
1661 sdkp
->index
= index
;
1663 sdkp
->previous_state
= 1;
1665 if (!sdp
->timeout
) {
1666 if (sdp
->type
!= TYPE_MOD
)
1667 sdp
->timeout
= SD_TIMEOUT
;
1669 sdp
->timeout
= SD_MOD_TIMEOUT
;
1672 device_initialize(&sdkp
->dev
);
1673 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1674 sdkp
->dev
.class = &sd_disk_class
;
1675 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1677 if (device_add(&sdkp
->dev
))
1680 get_device(&sdp
->sdev_gendev
);
1682 gd
->major
= sd_major((index
& 0xf0) >> 4);
1683 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1685 gd
->fops
= &sd_fops
;
1688 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1689 } else if (index
< (26 + 1) * 26) {
1690 sprintf(gd
->disk_name
, "sd%c%c",
1691 'a' + index
/ 26 - 1,'a' + index
% 26);
1693 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1694 const unsigned int m2
= (index
/ 26 - 1) % 26;
1695 const unsigned int m3
= index
% 26;
1696 sprintf(gd
->disk_name
, "sd%c%c%c",
1697 'a' + m1
, 'a' + m2
, 'a' + m3
);
1700 gd
->private_data
= &sdkp
->driver
;
1701 gd
->queue
= sdkp
->device
->request_queue
;
1703 sd_revalidate_disk(gd
);
1705 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1707 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1708 gd
->flags
= GENHD_FL_DRIVERFS
;
1710 gd
->flags
|= GENHD_FL_REMOVABLE
;
1712 dev_set_drvdata(dev
, sdkp
);
1715 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1716 sdp
->removable
? "removable " : "");
1729 * sd_remove - called whenever a scsi disk (previously recognized by
1730 * sd_probe) is detached from the system. It is called (potentially
1731 * multiple times) during sd module unload.
1732 * @sdp: pointer to mid level scsi device object
1734 * Note: this function is invoked from the scsi mid-level.
1735 * This function potentially frees up a device name (e.g. /dev/sdc)
1736 * that could be re-used by a subsequent sd_probe().
1737 * This function is not called when the built-in sd driver is "exit-ed".
1739 static int sd_remove(struct device
*dev
)
1741 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1743 device_del(&sdkp
->dev
);
1744 del_gendisk(sdkp
->disk
);
1747 mutex_lock(&sd_ref_mutex
);
1748 dev_set_drvdata(dev
, NULL
);
1749 put_device(&sdkp
->dev
);
1750 mutex_unlock(&sd_ref_mutex
);
1756 * scsi_disk_release - Called to free the scsi_disk structure
1757 * @dev: pointer to embedded class device
1759 * sd_ref_mutex must be held entering this routine. Because it is
1760 * called on last put, you should always use the scsi_disk_get()
1761 * scsi_disk_put() helpers which manipulate the semaphore directly
1762 * and never do a direct put_device.
1764 static void scsi_disk_release(struct device
*dev
)
1766 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1767 struct gendisk
*disk
= sdkp
->disk
;
1769 spin_lock(&sd_index_lock
);
1770 idr_remove(&sd_index_idr
, sdkp
->index
);
1771 spin_unlock(&sd_index_lock
);
1773 disk
->private_data
= NULL
;
1775 put_device(&sdkp
->device
->sdev_gendev
);
1780 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1782 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1783 struct scsi_sense_hdr sshdr
;
1784 struct scsi_device
*sdp
= sdkp
->device
;
1788 cmd
[4] |= 1; /* START */
1790 if (sdp
->start_stop_pwr_cond
)
1791 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1793 if (!scsi_device_online(sdp
))
1796 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1797 SD_TIMEOUT
, SD_MAX_RETRIES
);
1799 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1800 sd_print_result(sdkp
, res
);
1801 if (driver_byte(res
) & DRIVER_SENSE
)
1802 sd_print_sense_hdr(sdkp
, &sshdr
);
1809 * Send a SYNCHRONIZE CACHE instruction down to the device through
1810 * the normal SCSI command structure. Wait for the command to
1813 static void sd_shutdown(struct device
*dev
)
1815 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1818 return; /* this can happen */
1821 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1822 sd_sync_cache(sdkp
);
1825 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1826 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1827 sd_start_stop_device(sdkp
, 0);
1830 scsi_disk_put(sdkp
);
1833 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1835 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1839 return 0; /* this can happen */
1842 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1843 ret
= sd_sync_cache(sdkp
);
1848 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
1849 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1850 ret
= sd_start_stop_device(sdkp
, 0);
1854 scsi_disk_put(sdkp
);
1858 static int sd_resume(struct device
*dev
)
1860 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1863 if (!sdkp
->device
->manage_start_stop
)
1866 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
1867 ret
= sd_start_stop_device(sdkp
, 1);
1870 scsi_disk_put(sdkp
);
1875 * init_sd - entry point for this driver (both when built in or when
1878 * Note: this function registers this driver with the scsi mid-level.
1880 static int __init
init_sd(void)
1882 int majors
= 0, i
, err
;
1884 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1886 for (i
= 0; i
< SD_MAJORS
; i
++)
1887 if (register_blkdev(sd_major(i
), "sd") == 0)
1893 err
= class_register(&sd_disk_class
);
1897 err
= scsi_register_driver(&sd_template
.gendrv
);
1904 class_unregister(&sd_disk_class
);
1906 for (i
= 0; i
< SD_MAJORS
; i
++)
1907 unregister_blkdev(sd_major(i
), "sd");
1912 * exit_sd - exit point for this driver (when it is a module).
1914 * Note: this function unregisters this driver from the scsi mid-level.
1916 static void __exit
exit_sd(void)
1920 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1922 scsi_unregister_driver(&sd_template
.gendrv
);
1923 class_unregister(&sd_disk_class
);
1925 for (i
= 0; i
< SD_MAJORS
; i
++)
1926 unregister_blkdev(sd_major(i
), "sd");
1929 module_init(init_sd
);
1930 module_exit(exit_sd
);
1932 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1933 struct scsi_sense_hdr
*sshdr
)
1935 sd_printk(KERN_INFO
, sdkp
, "");
1936 scsi_show_sense_hdr(sshdr
);
1937 sd_printk(KERN_INFO
, sdkp
, "");
1938 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1941 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1943 sd_printk(KERN_INFO
, sdkp
, "");
1944 scsi_show_result(result
);