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 class_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)"
115 static ssize_t
sd_store_cache_type(struct class_device
*cdev
, const char *buf
,
118 int i
, ct
= -1, rcd
, wce
, sp
;
119 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
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
);
166 static ssize_t
sd_store_manage_start_stop(struct class_device
*cdev
,
167 const char *buf
, size_t count
)
169 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
170 struct scsi_device
*sdp
= sdkp
->device
;
172 if (!capable(CAP_SYS_ADMIN
))
175 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
180 static ssize_t
sd_store_allow_restart(struct class_device
*cdev
, const char *buf
,
183 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
184 struct scsi_device
*sdp
= sdkp
->device
;
186 if (!capable(CAP_SYS_ADMIN
))
189 if (sdp
->type
!= TYPE_DISK
)
192 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
197 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
199 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
200 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
202 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
205 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
207 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
209 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
212 static ssize_t
sd_show_manage_start_stop(struct class_device
*cdev
, char *buf
)
214 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
215 struct scsi_device
*sdp
= sdkp
->device
;
217 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
220 static ssize_t
sd_show_allow_restart(struct class_device
*cdev
, char *buf
)
222 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
224 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
227 static struct class_device_attribute sd_disk_attrs
[] = {
228 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
229 sd_store_cache_type
),
230 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
231 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
232 sd_store_allow_restart
),
233 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
234 sd_store_manage_start_stop
),
238 static struct class sd_disk_class
= {
240 .owner
= THIS_MODULE
,
241 .release
= scsi_disk_release
,
242 .class_dev_attrs
= sd_disk_attrs
,
245 static struct scsi_driver sd_template
= {
246 .owner
= THIS_MODULE
,
251 .suspend
= sd_suspend
,
253 .shutdown
= sd_shutdown
,
260 * Device no to disk mapping:
262 * major disc2 disc p1
263 * |............|.............|....|....| <- dev_t
266 * Inside a major, we have 16k disks, however mapped non-
267 * contiguously. The first 16 disks are for major0, the next
268 * ones with major1, ... Disk 256 is for major0 again, disk 272
270 * As we stay compatible with our numbering scheme, we can reuse
271 * the well-know SCSI majors 8, 65--71, 136--143.
273 static int sd_major(int major_idx
)
277 return SCSI_DISK0_MAJOR
;
279 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
281 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
284 return 0; /* shut up gcc */
288 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
290 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
293 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
295 struct scsi_disk
*sdkp
= NULL
;
297 if (disk
->private_data
) {
298 sdkp
= scsi_disk(disk
);
299 if (scsi_device_get(sdkp
->device
) == 0)
300 class_device_get(&sdkp
->cdev
);
307 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
309 struct scsi_disk
*sdkp
;
311 mutex_lock(&sd_ref_mutex
);
312 sdkp
= __scsi_disk_get(disk
);
313 mutex_unlock(&sd_ref_mutex
);
317 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
319 struct scsi_disk
*sdkp
;
321 mutex_lock(&sd_ref_mutex
);
322 sdkp
= dev_get_drvdata(dev
);
324 sdkp
= __scsi_disk_get(sdkp
->disk
);
325 mutex_unlock(&sd_ref_mutex
);
329 static void scsi_disk_put(struct scsi_disk
*sdkp
)
331 struct scsi_device
*sdev
= sdkp
->device
;
333 mutex_lock(&sd_ref_mutex
);
334 class_device_put(&sdkp
->cdev
);
335 scsi_device_put(sdev
);
336 mutex_unlock(&sd_ref_mutex
);
340 * sd_init_command - build a scsi (read or write) command from
341 * information in the request structure.
342 * @SCpnt: pointer to mid-level's per scsi command structure that
343 * contains request and into which the scsi command is written
345 * Returns 1 if successful and 0 if error (or cannot be done now).
347 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
349 struct scsi_cmnd
*SCpnt
;
350 struct scsi_device
*sdp
= q
->queuedata
;
351 struct gendisk
*disk
= rq
->rq_disk
;
352 sector_t block
= rq
->sector
;
353 unsigned int this_count
= rq
->nr_sectors
;
354 unsigned int timeout
= sdp
->timeout
;
357 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
358 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
360 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
364 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
365 if (ret
!= BLKPREP_OK
)
369 /* from here on until we're complete, any goto out
370 * is used for a killable error condition */
373 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
374 "sd_init_command: block=%llu, "
376 (unsigned long long)block
,
379 if (!sdp
|| !scsi_device_online(sdp
) ||
380 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
381 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
382 "Finishing %ld sectors\n",
384 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
385 "Retry with 0x%p\n", SCpnt
));
391 * quietly refuse to do anything to a changed disc until
392 * the changed bit has been reset
394 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
398 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
399 (unsigned long long)block
));
402 * If we have a 1K hardware sectorsize, prevent access to single
403 * 512 byte sectors. In theory we could handle this - in fact
404 * the scsi cdrom driver must be able to handle this because
405 * we typically use 1K blocksizes, and cdroms typically have
406 * 2K hardware sectorsizes. Of course, things are simpler
407 * with the cdrom, since it is read-only. For performance
408 * reasons, the filesystems should be able to handle this
409 * and not force the scsi disk driver to use bounce buffers
412 if (sdp
->sector_size
== 1024) {
413 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
414 scmd_printk(KERN_ERR
, SCpnt
,
415 "Bad block number requested\n");
419 this_count
= this_count
>> 1;
422 if (sdp
->sector_size
== 2048) {
423 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
424 scmd_printk(KERN_ERR
, SCpnt
,
425 "Bad block number requested\n");
429 this_count
= this_count
>> 2;
432 if (sdp
->sector_size
== 4096) {
433 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
434 scmd_printk(KERN_ERR
, SCpnt
,
435 "Bad block number requested\n");
439 this_count
= this_count
>> 3;
442 if (rq_data_dir(rq
) == WRITE
) {
443 if (!sdp
->writeable
) {
446 SCpnt
->cmnd
[0] = WRITE_6
;
447 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
448 } else if (rq_data_dir(rq
) == READ
) {
449 SCpnt
->cmnd
[0] = READ_6
;
450 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
452 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
456 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
457 "%s %d/%ld 512 byte blocks.\n",
458 (rq_data_dir(rq
) == WRITE
) ?
459 "writing" : "reading", this_count
,
464 if (block
> 0xffffffff) {
465 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
466 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
467 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
468 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
469 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
470 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
471 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
472 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
473 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
474 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
475 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
476 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
477 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
478 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
479 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
480 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
481 SCpnt
->device
->use_10_for_rw
) {
482 if (this_count
> 0xffff)
485 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
486 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
487 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
488 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
489 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
490 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
491 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
492 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
493 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
495 if (unlikely(blk_fua_rq(rq
))) {
497 * This happens only if this drive failed
498 * 10byte rw command with ILLEGAL_REQUEST
499 * during operation and thus turned off
502 scmd_printk(KERN_ERR
, SCpnt
,
503 "FUA write on READ/WRITE(6) drive\n");
507 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
508 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
509 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
510 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
513 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
516 * We shouldn't disconnect in the middle of a sector, so with a dumb
517 * host adapter, it's safe to assume that we can at least transfer
518 * this many bytes between each connect / disconnect.
520 SCpnt
->transfersize
= sdp
->sector_size
;
521 SCpnt
->underflow
= this_count
<< 9;
522 SCpnt
->allowed
= SD_MAX_RETRIES
;
523 SCpnt
->timeout_per_command
= timeout
;
526 * This indicates that the command is ready from our end to be
531 return scsi_prep_return(q
, rq
, ret
);
535 * sd_open - open a scsi disk device
536 * @inode: only i_rdev member may be used
537 * @filp: only f_mode and f_flags may be used
539 * Returns 0 if successful. Returns a negated errno value in case
542 * Note: This can be called from a user context (e.g. fsck(1) )
543 * or from within the kernel (e.g. as a result of a mount(1) ).
544 * In the latter case @inode and @filp carry an abridged amount
545 * of information as noted above.
547 static int sd_open(struct inode
*inode
, struct file
*filp
)
549 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
550 struct scsi_disk
*sdkp
;
551 struct scsi_device
*sdev
;
554 if (!(sdkp
= scsi_disk_get(disk
)))
558 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
563 * If the device is in error recovery, wait until it is done.
564 * If the device is offline, then disallow any access to it.
567 if (!scsi_block_when_processing_errors(sdev
))
570 if (sdev
->removable
|| sdkp
->write_prot
)
571 check_disk_change(inode
->i_bdev
);
574 * If the drive is empty, just let the open fail.
577 if (sdev
->removable
&& !sdkp
->media_present
&&
578 !(filp
->f_flags
& O_NDELAY
))
582 * If the device has the write protect tab set, have the open fail
583 * if the user expects to be able to write to the thing.
586 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
590 * It is possible that the disk changing stuff resulted in
591 * the device being taken offline. If this is the case,
592 * report this to the user, and don't pretend that the
593 * open actually succeeded.
596 if (!scsi_device_online(sdev
))
599 if (!sdkp
->openers
++ && sdev
->removable
) {
600 if (scsi_block_when_processing_errors(sdev
))
601 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
612 * sd_release - invoked when the (last) close(2) is called on this
614 * @inode: only i_rdev member may be used
615 * @filp: only f_mode and f_flags may be used
619 * Note: may block (uninterruptible) if error recovery is underway
622 static int sd_release(struct inode
*inode
, struct file
*filp
)
624 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
625 struct scsi_disk
*sdkp
= scsi_disk(disk
);
626 struct scsi_device
*sdev
= sdkp
->device
;
628 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
630 if (!--sdkp
->openers
&& sdev
->removable
) {
631 if (scsi_block_when_processing_errors(sdev
))
632 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
636 * XXX and what if there are packets in flight and this close()
637 * XXX is followed by a "rmmod sd_mod"?
643 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
645 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
646 struct scsi_device
*sdp
= sdkp
->device
;
647 struct Scsi_Host
*host
= sdp
->host
;
650 /* default to most commonly used values */
651 diskinfo
[0] = 0x40; /* 1 << 6 */
652 diskinfo
[1] = 0x20; /* 1 << 5 */
653 diskinfo
[2] = sdkp
->capacity
>> 11;
655 /* override with calculated, extended default, or driver values */
656 if (host
->hostt
->bios_param
)
657 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
659 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
661 geo
->heads
= diskinfo
[0];
662 geo
->sectors
= diskinfo
[1];
663 geo
->cylinders
= diskinfo
[2];
668 * sd_ioctl - process an ioctl
669 * @inode: only i_rdev/i_bdev members may be used
670 * @filp: only f_mode and f_flags may be used
671 * @cmd: ioctl command number
672 * @arg: this is third argument given to ioctl(2) system call.
673 * Often contains a pointer.
675 * Returns 0 if successful (some ioctls return postive numbers on
676 * success as well). Returns a negated errno value in case of error.
678 * Note: most ioctls are forward onto the block subsystem or further
679 * down in the scsi subsytem.
681 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
682 unsigned int cmd
, unsigned long arg
)
684 struct block_device
*bdev
= inode
->i_bdev
;
685 struct gendisk
*disk
= bdev
->bd_disk
;
686 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
687 void __user
*p
= (void __user
*)arg
;
690 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
691 disk
->disk_name
, cmd
));
694 * If we are in the middle of error recovery, don't let anyone
695 * else try and use this device. Also, if error recovery fails, it
696 * may try and take the device offline, in which case all further
697 * access to the device is prohibited.
699 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
700 if (!scsi_block_when_processing_errors(sdp
) || !error
)
704 * Send SCSI addressing ioctls directly to mid level, send other
705 * ioctls to block level and then onto mid level if they can't be
709 case SCSI_IOCTL_GET_IDLUN
:
710 case SCSI_IOCTL_GET_BUS_NUMBER
:
711 return scsi_ioctl(sdp
, cmd
, p
);
713 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
714 if (error
!= -ENOTTY
)
717 return scsi_ioctl(sdp
, cmd
, p
);
720 static void set_media_not_present(struct scsi_disk
*sdkp
)
722 sdkp
->media_present
= 0;
724 sdkp
->device
->changed
= 1;
728 * sd_media_changed - check if our medium changed
729 * @disk: kernel device descriptor
731 * Returns 0 if not applicable or no change; 1 if change
733 * Note: this function is invoked from the block subsystem.
735 static int sd_media_changed(struct gendisk
*disk
)
737 struct scsi_disk
*sdkp
= scsi_disk(disk
);
738 struct scsi_device
*sdp
= sdkp
->device
;
741 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
747 * If the device is offline, don't send any commands - just pretend as
748 * if the command failed. If the device ever comes back online, we
749 * can deal with it then. It is only because of unrecoverable errors
750 * that we would ever take a device offline in the first place.
752 if (!scsi_device_online(sdp
))
756 * Using TEST_UNIT_READY enables differentiation between drive with
757 * no cartridge loaded - NOT READY, drive with changed cartridge -
758 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
760 * Drives that auto spin down. eg iomega jaz 1G, will be started
761 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
762 * sd_revalidate() is called.
765 if (scsi_block_when_processing_errors(sdp
))
766 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
769 * Unable to test, unit probably not ready. This usually
770 * means there is no disc in the drive. Mark as changed,
771 * and we will figure it out later once the drive is
778 * For removable scsi disk we have to recognise the presence
779 * of a disk in the drive. This is kept in the struct scsi_disk
780 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
782 sdkp
->media_present
= 1;
784 retval
= sdp
->changed
;
790 set_media_not_present(sdkp
);
794 static int sd_sync_cache(struct scsi_disk
*sdkp
)
797 struct scsi_device
*sdp
= sdkp
->device
;
798 struct scsi_sense_hdr sshdr
;
800 if (!scsi_device_online(sdp
))
804 for (retries
= 3; retries
> 0; --retries
) {
805 unsigned char cmd
[10] = { 0 };
807 cmd
[0] = SYNCHRONIZE_CACHE
;
809 * Leave the rest of the command zero to indicate
812 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
813 SD_TIMEOUT
, SD_MAX_RETRIES
);
819 sd_print_result(sdkp
, res
);
820 if (driver_byte(res
) & DRIVER_SENSE
)
821 sd_print_sense_hdr(sdkp
, &sshdr
);
829 static int sd_issue_flush(struct request_queue
*q
, struct gendisk
*disk
,
830 sector_t
*error_sector
)
833 struct scsi_device
*sdp
= q
->queuedata
;
834 struct scsi_disk
*sdkp
;
836 if (sdp
->sdev_state
!= SDEV_RUNNING
)
839 sdkp
= scsi_disk_get_from_dev(&sdp
->sdev_gendev
);
845 ret
= sd_sync_cache(sdkp
);
850 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
852 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
853 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
854 rq
->timeout
= SD_TIMEOUT
;
855 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
859 static void sd_rescan(struct device
*dev
)
861 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
864 sd_revalidate_disk(sdkp
->disk
);
872 * This gets directly called from VFS. When the ioctl
873 * is not recognized we go back to the other translation paths.
875 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
877 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
878 struct gendisk
*disk
= bdev
->bd_disk
;
879 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
882 * If we are in the middle of error recovery, don't let anyone
883 * else try and use this device. Also, if error recovery fails, it
884 * may try and take the device offline, in which case all further
885 * access to the device is prohibited.
887 if (!scsi_block_when_processing_errors(sdev
))
890 if (sdev
->host
->hostt
->compat_ioctl
) {
893 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
899 * Let the static ioctl translation table take care of it.
905 static struct block_device_operations sd_fops
= {
906 .owner
= THIS_MODULE
,
908 .release
= sd_release
,
912 .compat_ioctl
= sd_compat_ioctl
,
914 .media_changed
= sd_media_changed
,
915 .revalidate_disk
= sd_revalidate_disk
,
919 * sd_done - bottom half handler: called when the lower level
920 * driver has completed (successfully or otherwise) a scsi command.
921 * @SCpnt: mid-level's per command structure.
923 * Note: potentially run from within an ISR. Must not block.
925 static int sd_done(struct scsi_cmnd
*SCpnt
)
927 int result
= SCpnt
->result
;
928 unsigned int xfer_size
= SCpnt
->request_bufflen
;
929 unsigned int good_bytes
= result
? 0 : xfer_size
;
930 u64 start_lba
= SCpnt
->request
->sector
;
932 struct scsi_sense_hdr sshdr
;
934 int sense_deferred
= 0;
938 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
940 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
942 #ifdef CONFIG_SCSI_LOGGING
943 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
945 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
946 "sd_done: sb[respc,sk,asc,"
947 "ascq]=%x,%x,%x,%x\n",
949 sshdr
.sense_key
, sshdr
.asc
,
953 if (driver_byte(result
) != DRIVER_SENSE
&&
954 (!sense_valid
|| sense_deferred
))
957 switch (sshdr
.sense_key
) {
960 if (!blk_fs_request(SCpnt
->request
))
962 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
963 SCSI_SENSE_BUFFERSIZE
,
967 if (xfer_size
<= SCpnt
->device
->sector_size
)
969 switch (SCpnt
->device
->sector_size
) {
985 /* Print something here with limiting frequency. */
989 /* This computation should always be done in terms of
990 * the resolution of the device's medium.
992 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
994 case RECOVERED_ERROR
:
996 /* Inform the user, but make sure that it's not treated
999 scsi_print_sense("sd", SCpnt
);
1001 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1002 good_bytes
= xfer_size
;
1004 case ILLEGAL_REQUEST
:
1005 if (SCpnt
->device
->use_10_for_rw
&&
1006 (SCpnt
->cmnd
[0] == READ_10
||
1007 SCpnt
->cmnd
[0] == WRITE_10
))
1008 SCpnt
->device
->use_10_for_rw
= 0;
1009 if (SCpnt
->device
->use_10_for_ms
&&
1010 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1011 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1012 SCpnt
->device
->use_10_for_ms
= 0;
1021 static int media_not_present(struct scsi_disk
*sdkp
,
1022 struct scsi_sense_hdr
*sshdr
)
1025 if (!scsi_sense_valid(sshdr
))
1027 /* not invoked for commands that could return deferred errors */
1028 if (sshdr
->sense_key
!= NOT_READY
&&
1029 sshdr
->sense_key
!= UNIT_ATTENTION
)
1031 if (sshdr
->asc
!= 0x3A) /* medium not present */
1034 set_media_not_present(sdkp
);
1039 * spinup disk - called only in sd_revalidate_disk()
1042 sd_spinup_disk(struct scsi_disk
*sdkp
)
1044 unsigned char cmd
[10];
1045 unsigned long spintime_expire
= 0;
1046 int retries
, spintime
;
1047 unsigned int the_result
;
1048 struct scsi_sense_hdr sshdr
;
1049 int sense_valid
= 0;
1053 /* Spin up drives, as required. Only do this at boot time */
1054 /* Spinup needs to be done for module loads too. */
1059 cmd
[0] = TEST_UNIT_READY
;
1060 memset((void *) &cmd
[1], 0, 9);
1062 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1068 * If the drive has indicated to us that it
1069 * doesn't have any media in it, don't bother
1070 * with any more polling.
1072 if (media_not_present(sdkp
, &sshdr
))
1076 sense_valid
= scsi_sense_valid(&sshdr
);
1078 } while (retries
< 3 &&
1079 (!scsi_status_is_good(the_result
) ||
1080 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1081 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1083 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1084 /* no sense, TUR either succeeded or failed
1085 * with a status error */
1086 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1087 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1088 sd_print_result(sdkp
, the_result
);
1094 * The device does not want the automatic start to be issued.
1096 if (sdkp
->device
->no_start_on_add
) {
1101 * If manual intervention is required, or this is an
1102 * absent USB storage device, a spinup is meaningless.
1105 sshdr
.sense_key
== NOT_READY
&&
1106 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1107 break; /* manual intervention required */
1110 * Issue command to spin up drive when not ready
1112 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1114 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1115 cmd
[0] = START_STOP
;
1116 cmd
[1] = 1; /* Return immediately */
1117 memset((void *) &cmd
[2], 0, 8);
1118 cmd
[4] = 1; /* Start spin cycle */
1119 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1121 SD_TIMEOUT
, SD_MAX_RETRIES
);
1122 spintime_expire
= jiffies
+ 100 * HZ
;
1125 /* Wait 1 second for next try */
1130 * Wait for USB flash devices with slow firmware.
1131 * Yes, this sense key/ASC combination shouldn't
1132 * occur here. It's characteristic of these devices.
1134 } else if (sense_valid
&&
1135 sshdr
.sense_key
== UNIT_ATTENTION
&&
1136 sshdr
.asc
== 0x28) {
1138 spintime_expire
= jiffies
+ 5 * HZ
;
1141 /* Wait 1 second for next try */
1144 /* we don't understand the sense code, so it's
1145 * probably pointless to loop */
1147 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1148 sd_print_sense_hdr(sdkp
, &sshdr
);
1153 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1156 if (scsi_status_is_good(the_result
))
1159 printk("not responding...\n");
1164 * read disk capacity
1167 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1169 unsigned char cmd
[16];
1170 int the_result
, retries
;
1171 int sector_size
= 0;
1173 struct scsi_sense_hdr sshdr
;
1174 int sense_valid
= 0;
1175 struct scsi_device
*sdp
= sdkp
->device
;
1181 memset((void *) cmd
, 0, 16);
1182 cmd
[0] = SERVICE_ACTION_IN
;
1183 cmd
[1] = SAI_READ_CAPACITY_16
;
1185 memset((void *) buffer
, 0, 12);
1187 cmd
[0] = READ_CAPACITY
;
1188 memset((void *) &cmd
[1], 0, 9);
1189 memset((void *) buffer
, 0, 8);
1192 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1193 buffer
, longrc
? 12 : 8, &sshdr
,
1194 SD_TIMEOUT
, SD_MAX_RETRIES
);
1196 if (media_not_present(sdkp
, &sshdr
))
1200 sense_valid
= scsi_sense_valid(&sshdr
);
1203 } while (the_result
&& retries
);
1205 if (the_result
&& !longrc
) {
1206 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1207 sd_print_result(sdkp
, the_result
);
1208 if (driver_byte(the_result
) & DRIVER_SENSE
)
1209 sd_print_sense_hdr(sdkp
, &sshdr
);
1211 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1213 /* Set dirty bit for removable devices if not ready -
1214 * sometimes drives will not report this properly. */
1215 if (sdp
->removable
&&
1216 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1219 /* Either no media are present but the drive didn't tell us,
1220 or they are present but the read capacity command fails */
1221 /* sdkp->media_present = 0; -- not always correct */
1222 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1225 } else if (the_result
&& longrc
) {
1226 /* READ CAPACITY(16) has been failed */
1227 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1228 sd_print_result(sdkp
, the_result
);
1229 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1231 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1236 sector_size
= (buffer
[4] << 24) |
1237 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1238 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1239 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1240 if(sizeof(sdkp
->capacity
) > 4) {
1241 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1242 "Trying to use READ CAPACITY(16).\n");
1246 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1247 "a kernel compiled with support for large "
1248 "block devices.\n");
1252 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1257 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1258 ((u64
)buffer
[1] << 48) |
1259 ((u64
)buffer
[2] << 40) |
1260 ((u64
)buffer
[3] << 32) |
1261 ((sector_t
)buffer
[4] << 24) |
1262 ((sector_t
)buffer
[5] << 16) |
1263 ((sector_t
)buffer
[6] << 8) |
1264 (sector_t
)buffer
[7]);
1266 sector_size
= (buffer
[8] << 24) |
1267 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1270 /* Some devices return the total number of sectors, not the
1271 * highest sector number. Make the necessary adjustment. */
1272 if (sdp
->fix_capacity
) {
1275 /* Some devices have version which report the correct sizes
1276 * and others which do not. We guess size according to a heuristic
1277 * and err on the side of lowering the capacity. */
1279 if (sdp
->guess_capacity
)
1280 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1285 if (sector_size
== 0) {
1287 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1291 if (sector_size
!= 512 &&
1292 sector_size
!= 1024 &&
1293 sector_size
!= 2048 &&
1294 sector_size
!= 4096 &&
1295 sector_size
!= 256) {
1296 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1299 * The user might want to re-format the drive with
1300 * a supported sectorsize. Once this happens, it
1301 * would be relatively trivial to set the thing up.
1302 * For this reason, we leave the thing in the table.
1306 * set a bogus sector size so the normal read/write
1307 * logic in the block layer will eventually refuse any
1308 * request on this device without tripping over power
1309 * of two sector size assumptions
1315 * The msdos fs needs to know the hardware sector size
1316 * So I have created this table. See ll_rw_blk.c
1317 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1319 int hard_sector
= sector_size
;
1320 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1321 struct request_queue
*queue
= sdp
->request_queue
;
1324 blk_queue_hardsect_size(queue
, hard_sector
);
1325 /* avoid 64-bit division on 32-bit platforms */
1326 sector_div(sz
, 625);
1328 sector_div(mb
, 1950);
1330 sd_printk(KERN_NOTICE
, sdkp
,
1331 "%llu %d-byte hardware sectors (%llu MB)\n",
1332 (unsigned long long)sdkp
->capacity
,
1333 hard_sector
, (unsigned long long)mb
);
1336 /* Rescale capacity to 512-byte units */
1337 if (sector_size
== 4096)
1338 sdkp
->capacity
<<= 3;
1339 else if (sector_size
== 2048)
1340 sdkp
->capacity
<<= 2;
1341 else if (sector_size
== 1024)
1342 sdkp
->capacity
<<= 1;
1343 else if (sector_size
== 256)
1344 sdkp
->capacity
>>= 1;
1346 sdkp
->device
->sector_size
= sector_size
;
1349 /* called with buffer of length 512 */
1351 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1352 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1353 struct scsi_sense_hdr
*sshdr
)
1355 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1356 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1361 * read write protect setting, if possible - called only in sd_revalidate_disk()
1362 * called with buffer of length SD_BUF_SIZE
1365 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1368 struct scsi_device
*sdp
= sdkp
->device
;
1369 struct scsi_mode_data data
;
1371 set_disk_ro(sdkp
->disk
, 0);
1372 if (sdp
->skip_ms_page_3f
) {
1373 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1377 if (sdp
->use_192_bytes_for_3f
) {
1378 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1381 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1382 * We have to start carefully: some devices hang if we ask
1383 * for more than is available.
1385 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1388 * Second attempt: ask for page 0 When only page 0 is
1389 * implemented, a request for page 3F may return Sense Key
1390 * 5: Illegal Request, Sense Code 24: Invalid field in
1393 if (!scsi_status_is_good(res
))
1394 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1397 * Third attempt: ask 255 bytes, as we did earlier.
1399 if (!scsi_status_is_good(res
))
1400 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1404 if (!scsi_status_is_good(res
)) {
1405 sd_printk(KERN_WARNING
, sdkp
,
1406 "Test WP failed, assume Write Enabled\n");
1408 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1409 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1410 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1411 sdkp
->write_prot
? "on" : "off");
1412 sd_printk(KERN_DEBUG
, sdkp
,
1413 "Mode Sense: %02x %02x %02x %02x\n",
1414 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1419 * sd_read_cache_type - called only from sd_revalidate_disk()
1420 * called with buffer of length SD_BUF_SIZE
1423 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1426 struct scsi_device
*sdp
= sdkp
->device
;
1430 struct scsi_mode_data data
;
1431 struct scsi_sense_hdr sshdr
;
1433 if (sdp
->skip_ms_page_8
)
1436 if (sdp
->type
== TYPE_RBC
) {
1444 /* cautiously ask */
1445 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1447 if (!scsi_status_is_good(res
))
1450 if (!data
.header_length
) {
1452 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1455 /* that went OK, now ask for the proper length */
1459 * We're only interested in the first three bytes, actually.
1460 * But the data cache page is defined for the first 20.
1467 /* Take headers and block descriptors into account */
1468 len
+= data
.header_length
+ data
.block_descriptor_length
;
1469 if (len
> SD_BUF_SIZE
)
1473 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1475 if (scsi_status_is_good(res
)) {
1476 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1478 if (offset
>= SD_BUF_SIZE
- 2) {
1479 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1483 if ((buffer
[offset
] & 0x3f) != modepage
) {
1484 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1488 if (modepage
== 8) {
1489 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1490 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1492 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1496 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1497 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1498 sd_printk(KERN_NOTICE
, sdkp
,
1499 "Uses READ/WRITE(6), disabling FUA\n");
1503 sd_printk(KERN_NOTICE
, sdkp
,
1504 "Write cache: %s, read cache: %s, %s\n",
1505 sdkp
->WCE
? "enabled" : "disabled",
1506 sdkp
->RCD
? "disabled" : "enabled",
1507 sdkp
->DPOFUA
? "supports DPO and FUA"
1508 : "doesn't support DPO or FUA");
1514 if (scsi_sense_valid(&sshdr
) &&
1515 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1516 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1517 /* Invalid field in CDB */
1518 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1520 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1523 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1530 * sd_revalidate_disk - called the first time a new disk is seen,
1531 * performs disk spin up, read_capacity, etc.
1532 * @disk: struct gendisk we care about
1534 static int sd_revalidate_disk(struct gendisk
*disk
)
1536 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1537 struct scsi_device
*sdp
= sdkp
->device
;
1538 unsigned char *buffer
;
1541 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1542 "sd_revalidate_disk\n"));
1545 * If the device is offline, don't try and read capacity or any
1546 * of the other niceties.
1548 if (!scsi_device_online(sdp
))
1551 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1553 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1554 "allocation failure.\n");
1558 /* defaults, until the device tells us otherwise */
1559 sdp
->sector_size
= 512;
1561 sdkp
->media_present
= 1;
1562 sdkp
->write_prot
= 0;
1566 sd_spinup_disk(sdkp
);
1569 * Without media there is no reason to ask; moreover, some devices
1570 * react badly if we do.
1572 if (sdkp
->media_present
) {
1573 sd_read_capacity(sdkp
, buffer
);
1574 sd_read_write_protect_flag(sdkp
, buffer
);
1575 sd_read_cache_type(sdkp
, buffer
);
1579 * We now have all cache related info, determine how we deal
1580 * with ordered requests. Note that as the current SCSI
1581 * dispatch function can alter request order, we cannot use
1582 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1585 ordered
= sdkp
->DPOFUA
1586 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1588 ordered
= QUEUE_ORDERED_DRAIN
;
1590 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1592 set_capacity(disk
, sdkp
->capacity
);
1600 * sd_probe - called during driver initialization and whenever a
1601 * new scsi device is attached to the system. It is called once
1602 * for each scsi device (not just disks) present.
1603 * @dev: pointer to device object
1605 * Returns 0 if successful (or not interested in this scsi device
1606 * (e.g. scanner)); 1 when there is an error.
1608 * Note: this function is invoked from the scsi mid-level.
1609 * This function sets up the mapping between a given
1610 * <host,channel,id,lun> (found in sdp) and new device name
1611 * (e.g. /dev/sda). More precisely it is the block device major
1612 * and minor number that is chosen here.
1614 * Assume sd_attach is not re-entrant (for time being)
1615 * Also think about sd_attach() and sd_remove() running coincidentally.
1617 static int sd_probe(struct device
*dev
)
1619 struct scsi_device
*sdp
= to_scsi_device(dev
);
1620 struct scsi_disk
*sdkp
;
1626 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1629 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1633 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1637 gd
= alloc_disk(16);
1641 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1644 spin_lock(&sd_index_lock
);
1645 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1646 spin_unlock(&sd_index_lock
);
1648 if (index
>= SD_MAX_DISKS
)
1654 sdkp
->driver
= &sd_template
;
1656 sdkp
->index
= index
;
1659 if (!sdp
->timeout
) {
1660 if (sdp
->type
!= TYPE_MOD
)
1661 sdp
->timeout
= SD_TIMEOUT
;
1663 sdp
->timeout
= SD_MOD_TIMEOUT
;
1666 class_device_initialize(&sdkp
->cdev
);
1667 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1668 sdkp
->cdev
.class = &sd_disk_class
;
1669 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1671 if (class_device_add(&sdkp
->cdev
))
1674 get_device(&sdp
->sdev_gendev
);
1676 gd
->major
= sd_major((index
& 0xf0) >> 4);
1677 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1679 gd
->fops
= &sd_fops
;
1682 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1683 } else if (index
< (26 + 1) * 26) {
1684 sprintf(gd
->disk_name
, "sd%c%c",
1685 'a' + index
/ 26 - 1,'a' + index
% 26);
1687 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1688 const unsigned int m2
= (index
/ 26 - 1) % 26;
1689 const unsigned int m3
= index
% 26;
1690 sprintf(gd
->disk_name
, "sd%c%c%c",
1691 'a' + m1
, 'a' + m2
, 'a' + m3
);
1694 gd
->private_data
= &sdkp
->driver
;
1695 gd
->queue
= sdkp
->device
->request_queue
;
1697 sd_revalidate_disk(gd
);
1699 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1700 blk_queue_issue_flush_fn(sdp
->request_queue
, sd_issue_flush
);
1702 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1703 gd
->flags
= GENHD_FL_DRIVERFS
;
1705 gd
->flags
|= GENHD_FL_REMOVABLE
;
1707 dev_set_drvdata(dev
, sdkp
);
1710 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1711 sdp
->removable
? "removable " : "");
1724 * sd_remove - called whenever a scsi disk (previously recognized by
1725 * sd_probe) is detached from the system. It is called (potentially
1726 * multiple times) during sd module unload.
1727 * @sdp: pointer to mid level scsi device object
1729 * Note: this function is invoked from the scsi mid-level.
1730 * This function potentially frees up a device name (e.g. /dev/sdc)
1731 * that could be re-used by a subsequent sd_probe().
1732 * This function is not called when the built-in sd driver is "exit-ed".
1734 static int sd_remove(struct device
*dev
)
1736 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1738 class_device_del(&sdkp
->cdev
);
1739 del_gendisk(sdkp
->disk
);
1742 mutex_lock(&sd_ref_mutex
);
1743 dev_set_drvdata(dev
, NULL
);
1744 class_device_put(&sdkp
->cdev
);
1745 mutex_unlock(&sd_ref_mutex
);
1751 * scsi_disk_release - Called to free the scsi_disk structure
1752 * @cdev: pointer to embedded class device
1754 * sd_ref_mutex must be held entering this routine. Because it is
1755 * called on last put, you should always use the scsi_disk_get()
1756 * scsi_disk_put() helpers which manipulate the semaphore directly
1757 * and never do a direct class_device_put().
1759 static void scsi_disk_release(struct class_device
*cdev
)
1761 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1762 struct gendisk
*disk
= sdkp
->disk
;
1764 spin_lock(&sd_index_lock
);
1765 idr_remove(&sd_index_idr
, sdkp
->index
);
1766 spin_unlock(&sd_index_lock
);
1768 disk
->private_data
= NULL
;
1770 put_device(&sdkp
->device
->sdev_gendev
);
1775 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1777 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1778 struct scsi_sense_hdr sshdr
;
1779 struct scsi_device
*sdp
= sdkp
->device
;
1783 cmd
[4] |= 1; /* START */
1785 if (!scsi_device_online(sdp
))
1788 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1789 SD_TIMEOUT
, SD_MAX_RETRIES
);
1791 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1792 sd_print_result(sdkp
, res
);
1793 if (driver_byte(res
) & DRIVER_SENSE
)
1794 sd_print_sense_hdr(sdkp
, &sshdr
);
1801 * Send a SYNCHRONIZE CACHE instruction down to the device through
1802 * the normal SCSI command structure. Wait for the command to
1805 static void sd_shutdown(struct device
*dev
)
1807 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1810 return; /* this can happen */
1813 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1814 sd_sync_cache(sdkp
);
1817 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1818 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1819 sd_start_stop_device(sdkp
, 0);
1822 scsi_disk_put(sdkp
);
1825 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1827 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1831 return 0; /* this can happen */
1834 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1835 ret
= sd_sync_cache(sdkp
);
1840 if (mesg
.event
== PM_EVENT_SUSPEND
&&
1841 sdkp
->device
->manage_start_stop
) {
1842 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1843 ret
= sd_start_stop_device(sdkp
, 0);
1847 scsi_disk_put(sdkp
);
1851 static int sd_resume(struct device
*dev
)
1853 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1856 if (!sdkp
->device
->manage_start_stop
)
1859 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
1860 ret
= sd_start_stop_device(sdkp
, 1);
1863 scsi_disk_put(sdkp
);
1868 * init_sd - entry point for this driver (both when built in or when
1871 * Note: this function registers this driver with the scsi mid-level.
1873 static int __init
init_sd(void)
1875 int majors
= 0, i
, err
;
1877 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1879 for (i
= 0; i
< SD_MAJORS
; i
++)
1880 if (register_blkdev(sd_major(i
), "sd") == 0)
1886 err
= class_register(&sd_disk_class
);
1890 err
= scsi_register_driver(&sd_template
.gendrv
);
1897 class_unregister(&sd_disk_class
);
1899 for (i
= 0; i
< SD_MAJORS
; i
++)
1900 unregister_blkdev(sd_major(i
), "sd");
1905 * exit_sd - exit point for this driver (when it is a module).
1907 * Note: this function unregisters this driver from the scsi mid-level.
1909 static void __exit
exit_sd(void)
1913 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1915 scsi_unregister_driver(&sd_template
.gendrv
);
1916 class_unregister(&sd_disk_class
);
1918 for (i
= 0; i
< SD_MAJORS
; i
++)
1919 unregister_blkdev(sd_major(i
), "sd");
1922 module_init(init_sd
);
1923 module_exit(exit_sd
);
1925 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1926 struct scsi_sense_hdr
*sshdr
)
1928 sd_printk(KERN_INFO
, sdkp
, "");
1929 scsi_show_sense_hdr(sshdr
);
1930 sd_printk(KERN_INFO
, sdkp
, "");
1931 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1934 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1936 sd_printk(KERN_INFO
, sdkp
, "");
1937 scsi_show_result(result
);