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 DEFINE_IDR(sd_index_idr
);
90 static DEFINE_SPINLOCK(sd_index_lock
);
92 /* This semaphore is used to mediate the 0->1 reference get in the
93 * face of object destruction (i.e. we can't allow a get on an
94 * object after last put) */
95 static DEFINE_MUTEX(sd_ref_mutex
);
97 static const char *sd_cache_types
[] = {
98 "write through", "none", "write back",
99 "write back, no read (daft)"
102 static ssize_t
sd_store_cache_type(struct class_device
*cdev
, const char *buf
,
105 int i
, ct
= -1, rcd
, wce
, sp
;
106 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
107 struct scsi_device
*sdp
= sdkp
->device
;
110 struct scsi_mode_data data
;
111 struct scsi_sense_hdr sshdr
;
114 if (sdp
->type
!= TYPE_DISK
)
115 /* no cache control on RBC devices; theoretically they
116 * can do it, but there's probably so many exceptions
117 * it's not worth the risk */
120 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
121 const int len
= strlen(sd_cache_types
[i
]);
122 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
130 rcd
= ct
& 0x01 ? 1 : 0;
131 wce
= ct
& 0x02 ? 1 : 0;
132 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
133 SD_MAX_RETRIES
, &data
, NULL
))
135 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
136 data
.block_descriptor_length
);
137 buffer_data
= buffer
+ data
.header_length
+
138 data
.block_descriptor_length
;
139 buffer_data
[2] &= ~0x05;
140 buffer_data
[2] |= wce
<< 2 | rcd
;
141 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
143 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
144 SD_MAX_RETRIES
, &data
, &sshdr
)) {
145 if (scsi_sense_valid(&sshdr
))
146 sd_print_sense_hdr(sdkp
, &sshdr
);
149 sd_revalidate_disk(sdkp
->disk
);
153 static ssize_t
sd_store_manage_start_stop(struct class_device
*cdev
,
154 const char *buf
, size_t count
)
156 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
157 struct scsi_device
*sdp
= sdkp
->device
;
159 if (!capable(CAP_SYS_ADMIN
))
162 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
167 static ssize_t
sd_store_allow_restart(struct class_device
*cdev
, const char *buf
,
170 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
171 struct scsi_device
*sdp
= sdkp
->device
;
173 if (!capable(CAP_SYS_ADMIN
))
176 if (sdp
->type
!= TYPE_DISK
)
179 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
184 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
186 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
187 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
189 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
192 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
194 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
196 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
199 static ssize_t
sd_show_manage_start_stop(struct class_device
*cdev
, char *buf
)
201 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
202 struct scsi_device
*sdp
= sdkp
->device
;
204 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
207 static ssize_t
sd_show_allow_restart(struct class_device
*cdev
, char *buf
)
209 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
211 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
214 static struct class_device_attribute sd_disk_attrs
[] = {
215 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
216 sd_store_cache_type
),
217 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
218 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
219 sd_store_allow_restart
),
220 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
221 sd_store_manage_start_stop
),
225 static struct class sd_disk_class
= {
227 .owner
= THIS_MODULE
,
228 .release
= scsi_disk_release
,
229 .class_dev_attrs
= sd_disk_attrs
,
232 static struct scsi_driver sd_template
= {
233 .owner
= THIS_MODULE
,
238 .suspend
= sd_suspend
,
240 .shutdown
= sd_shutdown
,
246 * Device no to disk mapping:
248 * major disc2 disc p1
249 * |............|.............|....|....| <- dev_t
252 * Inside a major, we have 16k disks, however mapped non-
253 * contiguously. The first 16 disks are for major0, the next
254 * ones with major1, ... Disk 256 is for major0 again, disk 272
256 * As we stay compatible with our numbering scheme, we can reuse
257 * the well-know SCSI majors 8, 65--71, 136--143.
259 static int sd_major(int major_idx
)
263 return SCSI_DISK0_MAJOR
;
265 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
267 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
270 return 0; /* shut up gcc */
274 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
276 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
279 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
281 struct scsi_disk
*sdkp
= NULL
;
283 if (disk
->private_data
) {
284 sdkp
= scsi_disk(disk
);
285 if (scsi_device_get(sdkp
->device
) == 0)
286 class_device_get(&sdkp
->cdev
);
293 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
295 struct scsi_disk
*sdkp
;
297 mutex_lock(&sd_ref_mutex
);
298 sdkp
= __scsi_disk_get(disk
);
299 mutex_unlock(&sd_ref_mutex
);
303 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
305 struct scsi_disk
*sdkp
;
307 mutex_lock(&sd_ref_mutex
);
308 sdkp
= dev_get_drvdata(dev
);
310 sdkp
= __scsi_disk_get(sdkp
->disk
);
311 mutex_unlock(&sd_ref_mutex
);
315 static void scsi_disk_put(struct scsi_disk
*sdkp
)
317 struct scsi_device
*sdev
= sdkp
->device
;
319 mutex_lock(&sd_ref_mutex
);
320 class_device_put(&sdkp
->cdev
);
321 scsi_device_put(sdev
);
322 mutex_unlock(&sd_ref_mutex
);
326 * sd_init_command - build a scsi (read or write) command from
327 * information in the request structure.
328 * @SCpnt: pointer to mid-level's per scsi command structure that
329 * contains request and into which the scsi command is written
331 * Returns 1 if successful and 0 if error (or cannot be done now).
333 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
335 struct scsi_cmnd
*SCpnt
;
336 struct scsi_device
*sdp
= q
->queuedata
;
337 struct gendisk
*disk
= rq
->rq_disk
;
338 sector_t block
= rq
->sector
;
339 unsigned int this_count
= rq
->nr_sectors
;
340 unsigned int timeout
= sdp
->timeout
;
343 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
344 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
346 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
350 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
351 if (ret
!= BLKPREP_OK
)
355 /* from here on until we're complete, any goto out
356 * is used for a killable error condition */
359 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
360 "sd_init_command: block=%llu, "
362 (unsigned long long)block
,
365 if (!sdp
|| !scsi_device_online(sdp
) ||
366 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
367 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
368 "Finishing %ld sectors\n",
370 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
371 "Retry with 0x%p\n", SCpnt
));
377 * quietly refuse to do anything to a changed disc until
378 * the changed bit has been reset
380 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
384 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
385 (unsigned long long)block
));
388 * If we have a 1K hardware sectorsize, prevent access to single
389 * 512 byte sectors. In theory we could handle this - in fact
390 * the scsi cdrom driver must be able to handle this because
391 * we typically use 1K blocksizes, and cdroms typically have
392 * 2K hardware sectorsizes. Of course, things are simpler
393 * with the cdrom, since it is read-only. For performance
394 * reasons, the filesystems should be able to handle this
395 * and not force the scsi disk driver to use bounce buffers
398 if (sdp
->sector_size
== 1024) {
399 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
400 scmd_printk(KERN_ERR
, SCpnt
,
401 "Bad block number requested\n");
405 this_count
= this_count
>> 1;
408 if (sdp
->sector_size
== 2048) {
409 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
410 scmd_printk(KERN_ERR
, SCpnt
,
411 "Bad block number requested\n");
415 this_count
= this_count
>> 2;
418 if (sdp
->sector_size
== 4096) {
419 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
420 scmd_printk(KERN_ERR
, SCpnt
,
421 "Bad block number requested\n");
425 this_count
= this_count
>> 3;
428 if (rq_data_dir(rq
) == WRITE
) {
429 if (!sdp
->writeable
) {
432 SCpnt
->cmnd
[0] = WRITE_6
;
433 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
434 } else if (rq_data_dir(rq
) == READ
) {
435 SCpnt
->cmnd
[0] = READ_6
;
436 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
438 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
442 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
443 "%s %d/%ld 512 byte blocks.\n",
444 (rq_data_dir(rq
) == WRITE
) ?
445 "writing" : "reading", this_count
,
450 if (block
> 0xffffffff) {
451 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
452 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
453 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
454 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
455 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
456 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
457 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
458 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
459 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
460 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
461 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
462 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
463 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
464 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
465 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
466 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
467 SCpnt
->device
->use_10_for_rw
) {
468 if (this_count
> 0xffff)
471 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
472 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
473 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
474 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
475 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
476 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
477 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
478 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
479 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
481 if (unlikely(blk_fua_rq(rq
))) {
483 * This happens only if this drive failed
484 * 10byte rw command with ILLEGAL_REQUEST
485 * during operation and thus turned off
488 scmd_printk(KERN_ERR
, SCpnt
,
489 "FUA write on READ/WRITE(6) drive\n");
493 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
494 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
495 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
496 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
499 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
502 * We shouldn't disconnect in the middle of a sector, so with a dumb
503 * host adapter, it's safe to assume that we can at least transfer
504 * this many bytes between each connect / disconnect.
506 SCpnt
->transfersize
= sdp
->sector_size
;
507 SCpnt
->underflow
= this_count
<< 9;
508 SCpnt
->allowed
= SD_MAX_RETRIES
;
509 SCpnt
->timeout_per_command
= timeout
;
512 * This is the completion routine we use. This is matched in terms
513 * of capability to this function.
515 SCpnt
->done
= sd_rw_intr
;
518 * This indicates that the command is ready from our end to be
523 return scsi_prep_return(q
, rq
, ret
);
527 * sd_open - open a scsi disk device
528 * @inode: only i_rdev member may be used
529 * @filp: only f_mode and f_flags may be used
531 * Returns 0 if successful. Returns a negated errno value in case
534 * Note: This can be called from a user context (e.g. fsck(1) )
535 * or from within the kernel (e.g. as a result of a mount(1) ).
536 * In the latter case @inode and @filp carry an abridged amount
537 * of information as noted above.
539 static int sd_open(struct inode
*inode
, struct file
*filp
)
541 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
542 struct scsi_disk
*sdkp
;
543 struct scsi_device
*sdev
;
546 if (!(sdkp
= scsi_disk_get(disk
)))
550 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
555 * If the device is in error recovery, wait until it is done.
556 * If the device is offline, then disallow any access to it.
559 if (!scsi_block_when_processing_errors(sdev
))
562 if (sdev
->removable
|| sdkp
->write_prot
)
563 check_disk_change(inode
->i_bdev
);
566 * If the drive is empty, just let the open fail.
569 if (sdev
->removable
&& !sdkp
->media_present
&&
570 !(filp
->f_flags
& O_NDELAY
))
574 * If the device has the write protect tab set, have the open fail
575 * if the user expects to be able to write to the thing.
578 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
582 * It is possible that the disk changing stuff resulted in
583 * the device being taken offline. If this is the case,
584 * report this to the user, and don't pretend that the
585 * open actually succeeded.
588 if (!scsi_device_online(sdev
))
591 if (!sdkp
->openers
++ && sdev
->removable
) {
592 if (scsi_block_when_processing_errors(sdev
))
593 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
604 * sd_release - invoked when the (last) close(2) is called on this
606 * @inode: only i_rdev member may be used
607 * @filp: only f_mode and f_flags may be used
611 * Note: may block (uninterruptible) if error recovery is underway
614 static int sd_release(struct inode
*inode
, struct file
*filp
)
616 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
617 struct scsi_disk
*sdkp
= scsi_disk(disk
);
618 struct scsi_device
*sdev
= sdkp
->device
;
620 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
622 if (!--sdkp
->openers
&& sdev
->removable
) {
623 if (scsi_block_when_processing_errors(sdev
))
624 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
628 * XXX and what if there are packets in flight and this close()
629 * XXX is followed by a "rmmod sd_mod"?
635 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
637 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
638 struct scsi_device
*sdp
= sdkp
->device
;
639 struct Scsi_Host
*host
= sdp
->host
;
642 /* default to most commonly used values */
643 diskinfo
[0] = 0x40; /* 1 << 6 */
644 diskinfo
[1] = 0x20; /* 1 << 5 */
645 diskinfo
[2] = sdkp
->capacity
>> 11;
647 /* override with calculated, extended default, or driver values */
648 if (host
->hostt
->bios_param
)
649 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
651 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
653 geo
->heads
= diskinfo
[0];
654 geo
->sectors
= diskinfo
[1];
655 geo
->cylinders
= diskinfo
[2];
660 * sd_ioctl - process an ioctl
661 * @inode: only i_rdev/i_bdev members may be used
662 * @filp: only f_mode and f_flags may be used
663 * @cmd: ioctl command number
664 * @arg: this is third argument given to ioctl(2) system call.
665 * Often contains a pointer.
667 * Returns 0 if successful (some ioctls return postive numbers on
668 * success as well). Returns a negated errno value in case of error.
670 * Note: most ioctls are forward onto the block subsystem or further
671 * down in the scsi subsytem.
673 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
674 unsigned int cmd
, unsigned long arg
)
676 struct block_device
*bdev
= inode
->i_bdev
;
677 struct gendisk
*disk
= bdev
->bd_disk
;
678 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
679 void __user
*p
= (void __user
*)arg
;
682 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
683 disk
->disk_name
, cmd
));
686 * If we are in the middle of error recovery, don't let anyone
687 * else try and use this device. Also, if error recovery fails, it
688 * may try and take the device offline, in which case all further
689 * access to the device is prohibited.
691 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
692 if (!scsi_block_when_processing_errors(sdp
) || !error
)
696 * Send SCSI addressing ioctls directly to mid level, send other
697 * ioctls to block level and then onto mid level if they can't be
701 case SCSI_IOCTL_GET_IDLUN
:
702 case SCSI_IOCTL_GET_BUS_NUMBER
:
703 return scsi_ioctl(sdp
, cmd
, p
);
705 error
= scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, p
);
706 if (error
!= -ENOTTY
)
709 return scsi_ioctl(sdp
, cmd
, p
);
712 static void set_media_not_present(struct scsi_disk
*sdkp
)
714 sdkp
->media_present
= 0;
716 sdkp
->device
->changed
= 1;
720 * sd_media_changed - check if our medium changed
721 * @disk: kernel device descriptor
723 * Returns 0 if not applicable or no change; 1 if change
725 * Note: this function is invoked from the block subsystem.
727 static int sd_media_changed(struct gendisk
*disk
)
729 struct scsi_disk
*sdkp
= scsi_disk(disk
);
730 struct scsi_device
*sdp
= sdkp
->device
;
733 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
739 * If the device is offline, don't send any commands - just pretend as
740 * if the command failed. If the device ever comes back online, we
741 * can deal with it then. It is only because of unrecoverable errors
742 * that we would ever take a device offline in the first place.
744 if (!scsi_device_online(sdp
))
748 * Using TEST_UNIT_READY enables differentiation between drive with
749 * no cartridge loaded - NOT READY, drive with changed cartridge -
750 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
752 * Drives that auto spin down. eg iomega jaz 1G, will be started
753 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
754 * sd_revalidate() is called.
757 if (scsi_block_when_processing_errors(sdp
))
758 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
761 * Unable to test, unit probably not ready. This usually
762 * means there is no disc in the drive. Mark as changed,
763 * and we will figure it out later once the drive is
770 * For removable scsi disk we have to recognise the presence
771 * of a disk in the drive. This is kept in the struct scsi_disk
772 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
774 sdkp
->media_present
= 1;
776 retval
= sdp
->changed
;
782 set_media_not_present(sdkp
);
786 static int sd_sync_cache(struct scsi_disk
*sdkp
)
789 struct scsi_device
*sdp
= sdkp
->device
;
790 struct scsi_sense_hdr sshdr
;
792 if (!scsi_device_online(sdp
))
796 for (retries
= 3; retries
> 0; --retries
) {
797 unsigned char cmd
[10] = { 0 };
799 cmd
[0] = SYNCHRONIZE_CACHE
;
801 * Leave the rest of the command zero to indicate
804 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
805 SD_TIMEOUT
, SD_MAX_RETRIES
);
811 sd_print_result(sdkp
, res
);
812 if (driver_byte(res
) & DRIVER_SENSE
)
813 sd_print_sense_hdr(sdkp
, &sshdr
);
821 static int sd_issue_flush(struct request_queue
*q
, struct gendisk
*disk
,
822 sector_t
*error_sector
)
825 struct scsi_device
*sdp
= q
->queuedata
;
826 struct scsi_disk
*sdkp
;
828 if (sdp
->sdev_state
!= SDEV_RUNNING
)
831 sdkp
= scsi_disk_get_from_dev(&sdp
->sdev_gendev
);
837 ret
= sd_sync_cache(sdkp
);
842 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
844 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
845 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
846 rq
->timeout
= SD_TIMEOUT
;
847 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
851 static void sd_rescan(struct device
*dev
)
853 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
856 sd_revalidate_disk(sdkp
->disk
);
864 * This gets directly called from VFS. When the ioctl
865 * is not recognized we go back to the other translation paths.
867 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
869 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
870 struct gendisk
*disk
= bdev
->bd_disk
;
871 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
874 * If we are in the middle of error recovery, don't let anyone
875 * else try and use this device. Also, if error recovery fails, it
876 * may try and take the device offline, in which case all further
877 * access to the device is prohibited.
879 if (!scsi_block_when_processing_errors(sdev
))
882 if (sdev
->host
->hostt
->compat_ioctl
) {
885 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
891 * Let the static ioctl translation table take care of it.
897 static struct block_device_operations sd_fops
= {
898 .owner
= THIS_MODULE
,
900 .release
= sd_release
,
904 .compat_ioctl
= sd_compat_ioctl
,
906 .media_changed
= sd_media_changed
,
907 .revalidate_disk
= sd_revalidate_disk
,
911 * sd_rw_intr - bottom half handler: called when the lower level
912 * driver has completed (successfully or otherwise) a scsi command.
913 * @SCpnt: mid-level's per command structure.
915 * Note: potentially run from within an ISR. Must not block.
917 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
919 int result
= SCpnt
->result
;
920 unsigned int xfer_size
= SCpnt
->request_bufflen
;
921 unsigned int good_bytes
= result
? 0 : xfer_size
;
922 u64 start_lba
= SCpnt
->request
->sector
;
924 struct scsi_sense_hdr sshdr
;
926 int sense_deferred
= 0;
930 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
932 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
934 #ifdef CONFIG_SCSI_LOGGING
935 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
937 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
938 "sd_rw_intr: sb[respc,sk,asc,"
939 "ascq]=%x,%x,%x,%x\n",
941 sshdr
.sense_key
, sshdr
.asc
,
945 if (driver_byte(result
) != DRIVER_SENSE
&&
946 (!sense_valid
|| sense_deferred
))
949 switch (sshdr
.sense_key
) {
952 if (!blk_fs_request(SCpnt
->request
))
954 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
955 SCSI_SENSE_BUFFERSIZE
,
959 if (xfer_size
<= SCpnt
->device
->sector_size
)
961 switch (SCpnt
->device
->sector_size
) {
977 /* Print something here with limiting frequency. */
981 /* This computation should always be done in terms of
982 * the resolution of the device's medium.
984 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
986 case RECOVERED_ERROR
:
988 /* Inform the user, but make sure that it's not treated
991 scsi_print_sense("sd", SCpnt
);
993 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
994 good_bytes
= xfer_size
;
996 case ILLEGAL_REQUEST
:
997 if (SCpnt
->device
->use_10_for_rw
&&
998 (SCpnt
->cmnd
[0] == READ_10
||
999 SCpnt
->cmnd
[0] == WRITE_10
))
1000 SCpnt
->device
->use_10_for_rw
= 0;
1001 if (SCpnt
->device
->use_10_for_ms
&&
1002 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1003 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1004 SCpnt
->device
->use_10_for_ms
= 0;
1010 scsi_io_completion(SCpnt
, good_bytes
);
1013 static int media_not_present(struct scsi_disk
*sdkp
,
1014 struct scsi_sense_hdr
*sshdr
)
1017 if (!scsi_sense_valid(sshdr
))
1019 /* not invoked for commands that could return deferred errors */
1020 if (sshdr
->sense_key
!= NOT_READY
&&
1021 sshdr
->sense_key
!= UNIT_ATTENTION
)
1023 if (sshdr
->asc
!= 0x3A) /* medium not present */
1026 set_media_not_present(sdkp
);
1031 * spinup disk - called only in sd_revalidate_disk()
1034 sd_spinup_disk(struct scsi_disk
*sdkp
)
1036 unsigned char cmd
[10];
1037 unsigned long spintime_expire
= 0;
1038 int retries
, spintime
;
1039 unsigned int the_result
;
1040 struct scsi_sense_hdr sshdr
;
1041 int sense_valid
= 0;
1045 /* Spin up drives, as required. Only do this at boot time */
1046 /* Spinup needs to be done for module loads too. */
1051 cmd
[0] = TEST_UNIT_READY
;
1052 memset((void *) &cmd
[1], 0, 9);
1054 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1060 * If the drive has indicated to us that it
1061 * doesn't have any media in it, don't bother
1062 * with any more polling.
1064 if (media_not_present(sdkp
, &sshdr
))
1068 sense_valid
= scsi_sense_valid(&sshdr
);
1070 } while (retries
< 3 &&
1071 (!scsi_status_is_good(the_result
) ||
1072 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1073 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1075 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1076 /* no sense, TUR either succeeded or failed
1077 * with a status error */
1078 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1079 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1080 sd_print_result(sdkp
, the_result
);
1086 * The device does not want the automatic start to be issued.
1088 if (sdkp
->device
->no_start_on_add
) {
1093 * If manual intervention is required, or this is an
1094 * absent USB storage device, a spinup is meaningless.
1097 sshdr
.sense_key
== NOT_READY
&&
1098 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1099 break; /* manual intervention required */
1102 * Issue command to spin up drive when not ready
1104 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1106 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1107 cmd
[0] = START_STOP
;
1108 cmd
[1] = 1; /* Return immediately */
1109 memset((void *) &cmd
[2], 0, 8);
1110 cmd
[4] = 1; /* Start spin cycle */
1111 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1113 SD_TIMEOUT
, SD_MAX_RETRIES
);
1114 spintime_expire
= jiffies
+ 100 * HZ
;
1117 /* Wait 1 second for next try */
1122 * Wait for USB flash devices with slow firmware.
1123 * Yes, this sense key/ASC combination shouldn't
1124 * occur here. It's characteristic of these devices.
1126 } else if (sense_valid
&&
1127 sshdr
.sense_key
== UNIT_ATTENTION
&&
1128 sshdr
.asc
== 0x28) {
1130 spintime_expire
= jiffies
+ 5 * HZ
;
1133 /* Wait 1 second for next try */
1136 /* we don't understand the sense code, so it's
1137 * probably pointless to loop */
1139 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1140 sd_print_sense_hdr(sdkp
, &sshdr
);
1145 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1148 if (scsi_status_is_good(the_result
))
1151 printk("not responding...\n");
1156 * read disk capacity
1159 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1161 unsigned char cmd
[16];
1162 int the_result
, retries
;
1163 int sector_size
= 0;
1165 struct scsi_sense_hdr sshdr
;
1166 int sense_valid
= 0;
1167 struct scsi_device
*sdp
= sdkp
->device
;
1173 memset((void *) cmd
, 0, 16);
1174 cmd
[0] = SERVICE_ACTION_IN
;
1175 cmd
[1] = SAI_READ_CAPACITY_16
;
1177 memset((void *) buffer
, 0, 12);
1179 cmd
[0] = READ_CAPACITY
;
1180 memset((void *) &cmd
[1], 0, 9);
1181 memset((void *) buffer
, 0, 8);
1184 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1185 buffer
, longrc
? 12 : 8, &sshdr
,
1186 SD_TIMEOUT
, SD_MAX_RETRIES
);
1188 if (media_not_present(sdkp
, &sshdr
))
1192 sense_valid
= scsi_sense_valid(&sshdr
);
1195 } while (the_result
&& retries
);
1197 if (the_result
&& !longrc
) {
1198 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1199 sd_print_result(sdkp
, the_result
);
1200 if (driver_byte(the_result
) & DRIVER_SENSE
)
1201 sd_print_sense_hdr(sdkp
, &sshdr
);
1203 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1205 /* Set dirty bit for removable devices if not ready -
1206 * sometimes drives will not report this properly. */
1207 if (sdp
->removable
&&
1208 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1211 /* Either no media are present but the drive didn't tell us,
1212 or they are present but the read capacity command fails */
1213 /* sdkp->media_present = 0; -- not always correct */
1214 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1217 } else if (the_result
&& longrc
) {
1218 /* READ CAPACITY(16) has been failed */
1219 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1220 sd_print_result(sdkp
, the_result
);
1221 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1223 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1228 sector_size
= (buffer
[4] << 24) |
1229 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1230 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1231 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1232 if(sizeof(sdkp
->capacity
) > 4) {
1233 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1234 "Trying to use READ CAPACITY(16).\n");
1238 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1239 "a kernel compiled with support for large "
1240 "block devices.\n");
1244 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1249 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1250 ((u64
)buffer
[1] << 48) |
1251 ((u64
)buffer
[2] << 40) |
1252 ((u64
)buffer
[3] << 32) |
1253 ((sector_t
)buffer
[4] << 24) |
1254 ((sector_t
)buffer
[5] << 16) |
1255 ((sector_t
)buffer
[6] << 8) |
1256 (sector_t
)buffer
[7]);
1258 sector_size
= (buffer
[8] << 24) |
1259 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1262 /* Some devices return the total number of sectors, not the
1263 * highest sector number. Make the necessary adjustment. */
1264 if (sdp
->fix_capacity
) {
1267 /* Some devices have version which report the correct sizes
1268 * and others which do not. We guess size according to a heuristic
1269 * and err on the side of lowering the capacity. */
1271 if (sdp
->guess_capacity
)
1272 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1277 if (sector_size
== 0) {
1279 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1283 if (sector_size
!= 512 &&
1284 sector_size
!= 1024 &&
1285 sector_size
!= 2048 &&
1286 sector_size
!= 4096 &&
1287 sector_size
!= 256) {
1288 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1291 * The user might want to re-format the drive with
1292 * a supported sectorsize. Once this happens, it
1293 * would be relatively trivial to set the thing up.
1294 * For this reason, we leave the thing in the table.
1298 * set a bogus sector size so the normal read/write
1299 * logic in the block layer will eventually refuse any
1300 * request on this device without tripping over power
1301 * of two sector size assumptions
1307 * The msdos fs needs to know the hardware sector size
1308 * So I have created this table. See ll_rw_blk.c
1309 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1311 int hard_sector
= sector_size
;
1312 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1313 struct request_queue
*queue
= sdp
->request_queue
;
1316 blk_queue_hardsect_size(queue
, hard_sector
);
1317 /* avoid 64-bit division on 32-bit platforms */
1318 sector_div(sz
, 625);
1320 sector_div(mb
, 1950);
1322 sd_printk(KERN_NOTICE
, sdkp
,
1323 "%llu %d-byte hardware sectors (%llu MB)\n",
1324 (unsigned long long)sdkp
->capacity
,
1325 hard_sector
, (unsigned long long)mb
);
1328 /* Rescale capacity to 512-byte units */
1329 if (sector_size
== 4096)
1330 sdkp
->capacity
<<= 3;
1331 else if (sector_size
== 2048)
1332 sdkp
->capacity
<<= 2;
1333 else if (sector_size
== 1024)
1334 sdkp
->capacity
<<= 1;
1335 else if (sector_size
== 256)
1336 sdkp
->capacity
>>= 1;
1338 sdkp
->device
->sector_size
= sector_size
;
1341 /* called with buffer of length 512 */
1343 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1344 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1345 struct scsi_sense_hdr
*sshdr
)
1347 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1348 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1353 * read write protect setting, if possible - called only in sd_revalidate_disk()
1354 * called with buffer of length SD_BUF_SIZE
1357 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1360 struct scsi_device
*sdp
= sdkp
->device
;
1361 struct scsi_mode_data data
;
1363 set_disk_ro(sdkp
->disk
, 0);
1364 if (sdp
->skip_ms_page_3f
) {
1365 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1369 if (sdp
->use_192_bytes_for_3f
) {
1370 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1373 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1374 * We have to start carefully: some devices hang if we ask
1375 * for more than is available.
1377 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1380 * Second attempt: ask for page 0 When only page 0 is
1381 * implemented, a request for page 3F may return Sense Key
1382 * 5: Illegal Request, Sense Code 24: Invalid field in
1385 if (!scsi_status_is_good(res
))
1386 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1389 * Third attempt: ask 255 bytes, as we did earlier.
1391 if (!scsi_status_is_good(res
))
1392 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1396 if (!scsi_status_is_good(res
)) {
1397 sd_printk(KERN_WARNING
, sdkp
,
1398 "Test WP failed, assume Write Enabled\n");
1400 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1401 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1402 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1403 sdkp
->write_prot
? "on" : "off");
1404 sd_printk(KERN_DEBUG
, sdkp
,
1405 "Mode Sense: %02x %02x %02x %02x\n",
1406 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1411 * sd_read_cache_type - called only from sd_revalidate_disk()
1412 * called with buffer of length SD_BUF_SIZE
1415 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1418 struct scsi_device
*sdp
= sdkp
->device
;
1422 struct scsi_mode_data data
;
1423 struct scsi_sense_hdr sshdr
;
1425 if (sdp
->skip_ms_page_8
)
1428 if (sdp
->type
== TYPE_RBC
) {
1436 /* cautiously ask */
1437 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1439 if (!scsi_status_is_good(res
))
1442 if (!data
.header_length
) {
1444 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1447 /* that went OK, now ask for the proper length */
1451 * We're only interested in the first three bytes, actually.
1452 * But the data cache page is defined for the first 20.
1459 /* Take headers and block descriptors into account */
1460 len
+= data
.header_length
+ data
.block_descriptor_length
;
1461 if (len
> SD_BUF_SIZE
)
1465 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1467 if (scsi_status_is_good(res
)) {
1468 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1470 if (offset
>= SD_BUF_SIZE
- 2) {
1471 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1475 if ((buffer
[offset
] & 0x3f) != modepage
) {
1476 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1480 if (modepage
== 8) {
1481 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1482 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1484 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1488 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1489 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1490 sd_printk(KERN_NOTICE
, sdkp
,
1491 "Uses READ/WRITE(6), disabling FUA\n");
1495 sd_printk(KERN_NOTICE
, sdkp
,
1496 "Write cache: %s, read cache: %s, %s\n",
1497 sdkp
->WCE
? "enabled" : "disabled",
1498 sdkp
->RCD
? "disabled" : "enabled",
1499 sdkp
->DPOFUA
? "supports DPO and FUA"
1500 : "doesn't support DPO or FUA");
1506 if (scsi_sense_valid(&sshdr
) &&
1507 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1508 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1509 /* Invalid field in CDB */
1510 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1512 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1515 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1522 * sd_revalidate_disk - called the first time a new disk is seen,
1523 * performs disk spin up, read_capacity, etc.
1524 * @disk: struct gendisk we care about
1526 static int sd_revalidate_disk(struct gendisk
*disk
)
1528 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1529 struct scsi_device
*sdp
= sdkp
->device
;
1530 unsigned char *buffer
;
1533 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1534 "sd_revalidate_disk\n"));
1537 * If the device is offline, don't try and read capacity or any
1538 * of the other niceties.
1540 if (!scsi_device_online(sdp
))
1543 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1545 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1546 "allocation failure.\n");
1550 /* defaults, until the device tells us otherwise */
1551 sdp
->sector_size
= 512;
1553 sdkp
->media_present
= 1;
1554 sdkp
->write_prot
= 0;
1558 sd_spinup_disk(sdkp
);
1561 * Without media there is no reason to ask; moreover, some devices
1562 * react badly if we do.
1564 if (sdkp
->media_present
) {
1565 sd_read_capacity(sdkp
, buffer
);
1566 sd_read_write_protect_flag(sdkp
, buffer
);
1567 sd_read_cache_type(sdkp
, buffer
);
1571 * We now have all cache related info, determine how we deal
1572 * with ordered requests. Note that as the current SCSI
1573 * dispatch function can alter request order, we cannot use
1574 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1577 ordered
= sdkp
->DPOFUA
1578 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1580 ordered
= QUEUE_ORDERED_DRAIN
;
1582 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1584 set_capacity(disk
, sdkp
->capacity
);
1592 * sd_probe - called during driver initialization and whenever a
1593 * new scsi device is attached to the system. It is called once
1594 * for each scsi device (not just disks) present.
1595 * @dev: pointer to device object
1597 * Returns 0 if successful (or not interested in this scsi device
1598 * (e.g. scanner)); 1 when there is an error.
1600 * Note: this function is invoked from the scsi mid-level.
1601 * This function sets up the mapping between a given
1602 * <host,channel,id,lun> (found in sdp) and new device name
1603 * (e.g. /dev/sda). More precisely it is the block device major
1604 * and minor number that is chosen here.
1606 * Assume sd_attach is not re-entrant (for time being)
1607 * Also think about sd_attach() and sd_remove() running coincidentally.
1609 static int sd_probe(struct device
*dev
)
1611 struct scsi_device
*sdp
= to_scsi_device(dev
);
1612 struct scsi_disk
*sdkp
;
1618 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1621 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1625 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1629 gd
= alloc_disk(16);
1633 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1636 spin_lock(&sd_index_lock
);
1637 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1638 spin_unlock(&sd_index_lock
);
1640 if (index
>= SD_MAX_DISKS
)
1646 sdkp
->driver
= &sd_template
;
1648 sdkp
->index
= index
;
1651 if (!sdp
->timeout
) {
1652 if (sdp
->type
!= TYPE_MOD
)
1653 sdp
->timeout
= SD_TIMEOUT
;
1655 sdp
->timeout
= SD_MOD_TIMEOUT
;
1658 class_device_initialize(&sdkp
->cdev
);
1659 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1660 sdkp
->cdev
.class = &sd_disk_class
;
1661 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1663 if (class_device_add(&sdkp
->cdev
))
1666 get_device(&sdp
->sdev_gendev
);
1668 gd
->major
= sd_major((index
& 0xf0) >> 4);
1669 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1671 gd
->fops
= &sd_fops
;
1674 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1675 } else if (index
< (26 + 1) * 26) {
1676 sprintf(gd
->disk_name
, "sd%c%c",
1677 'a' + index
/ 26 - 1,'a' + index
% 26);
1679 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1680 const unsigned int m2
= (index
/ 26 - 1) % 26;
1681 const unsigned int m3
= index
% 26;
1682 sprintf(gd
->disk_name
, "sd%c%c%c",
1683 'a' + m1
, 'a' + m2
, 'a' + m3
);
1686 gd
->private_data
= &sdkp
->driver
;
1687 gd
->queue
= sdkp
->device
->request_queue
;
1689 sd_revalidate_disk(gd
);
1691 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1692 blk_queue_issue_flush_fn(sdp
->request_queue
, sd_issue_flush
);
1694 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1695 gd
->flags
= GENHD_FL_DRIVERFS
;
1697 gd
->flags
|= GENHD_FL_REMOVABLE
;
1699 dev_set_drvdata(dev
, sdkp
);
1702 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1703 sdp
->removable
? "removable " : "");
1716 * sd_remove - called whenever a scsi disk (previously recognized by
1717 * sd_probe) is detached from the system. It is called (potentially
1718 * multiple times) during sd module unload.
1719 * @sdp: pointer to mid level scsi device object
1721 * Note: this function is invoked from the scsi mid-level.
1722 * This function potentially frees up a device name (e.g. /dev/sdc)
1723 * that could be re-used by a subsequent sd_probe().
1724 * This function is not called when the built-in sd driver is "exit-ed".
1726 static int sd_remove(struct device
*dev
)
1728 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1730 class_device_del(&sdkp
->cdev
);
1731 del_gendisk(sdkp
->disk
);
1734 mutex_lock(&sd_ref_mutex
);
1735 dev_set_drvdata(dev
, NULL
);
1736 class_device_put(&sdkp
->cdev
);
1737 mutex_unlock(&sd_ref_mutex
);
1743 * scsi_disk_release - Called to free the scsi_disk structure
1744 * @cdev: pointer to embedded class device
1746 * sd_ref_mutex must be held entering this routine. Because it is
1747 * called on last put, you should always use the scsi_disk_get()
1748 * scsi_disk_put() helpers which manipulate the semaphore directly
1749 * and never do a direct class_device_put().
1751 static void scsi_disk_release(struct class_device
*cdev
)
1753 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1754 struct gendisk
*disk
= sdkp
->disk
;
1756 spin_lock(&sd_index_lock
);
1757 idr_remove(&sd_index_idr
, sdkp
->index
);
1758 spin_unlock(&sd_index_lock
);
1760 disk
->private_data
= NULL
;
1762 put_device(&sdkp
->device
->sdev_gendev
);
1767 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1769 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1770 struct scsi_sense_hdr sshdr
;
1771 struct scsi_device
*sdp
= sdkp
->device
;
1775 cmd
[4] |= 1; /* START */
1777 if (!scsi_device_online(sdp
))
1780 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1781 SD_TIMEOUT
, SD_MAX_RETRIES
);
1783 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1784 sd_print_result(sdkp
, res
);
1785 if (driver_byte(res
) & DRIVER_SENSE
)
1786 sd_print_sense_hdr(sdkp
, &sshdr
);
1793 * Send a SYNCHRONIZE CACHE instruction down to the device through
1794 * the normal SCSI command structure. Wait for the command to
1797 static void sd_shutdown(struct device
*dev
)
1799 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1802 return; /* this can happen */
1805 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1806 sd_sync_cache(sdkp
);
1809 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1810 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1811 sd_start_stop_device(sdkp
, 0);
1814 scsi_disk_put(sdkp
);
1817 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1819 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1823 return 0; /* this can happen */
1826 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1827 ret
= sd_sync_cache(sdkp
);
1832 if (mesg
.event
== PM_EVENT_SUSPEND
&&
1833 sdkp
->device
->manage_start_stop
) {
1834 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1835 ret
= sd_start_stop_device(sdkp
, 0);
1839 scsi_disk_put(sdkp
);
1843 static int sd_resume(struct device
*dev
)
1845 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1848 if (!sdkp
->device
->manage_start_stop
)
1851 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
1852 ret
= sd_start_stop_device(sdkp
, 1);
1855 scsi_disk_put(sdkp
);
1860 * init_sd - entry point for this driver (both when built in or when
1863 * Note: this function registers this driver with the scsi mid-level.
1865 static int __init
init_sd(void)
1867 int majors
= 0, i
, err
;
1869 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1871 for (i
= 0; i
< SD_MAJORS
; i
++)
1872 if (register_blkdev(sd_major(i
), "sd") == 0)
1878 err
= class_register(&sd_disk_class
);
1882 err
= scsi_register_driver(&sd_template
.gendrv
);
1889 class_unregister(&sd_disk_class
);
1891 for (i
= 0; i
< SD_MAJORS
; i
++)
1892 unregister_blkdev(sd_major(i
), "sd");
1897 * exit_sd - exit point for this driver (when it is a module).
1899 * Note: this function unregisters this driver from the scsi mid-level.
1901 static void __exit
exit_sd(void)
1905 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1907 scsi_unregister_driver(&sd_template
.gendrv
);
1908 class_unregister(&sd_disk_class
);
1910 for (i
= 0; i
< SD_MAJORS
; i
++)
1911 unregister_blkdev(sd_major(i
), "sd");
1914 module_init(init_sd
);
1915 module_exit(exit_sd
);
1917 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1918 struct scsi_sense_hdr
*sshdr
)
1920 sd_printk(KERN_INFO
, sdkp
, "");
1921 scsi_show_sense_hdr(sshdr
);
1922 sd_printk(KERN_INFO
, sdkp
, "");
1923 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1926 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1928 sd_printk(KERN_INFO
, sdkp
, "");
1929 scsi_show_result(result
);