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
,
243 .init_command
= sd_init_command
,
244 .issue_flush
= sd_issue_flush
,
248 * Device no to disk mapping:
250 * major disc2 disc p1
251 * |............|.............|....|....| <- dev_t
254 * Inside a major, we have 16k disks, however mapped non-
255 * contiguously. The first 16 disks are for major0, the next
256 * ones with major1, ... Disk 256 is for major0 again, disk 272
258 * As we stay compatible with our numbering scheme, we can reuse
259 * the well-know SCSI majors 8, 65--71, 136--143.
261 static int sd_major(int major_idx
)
265 return SCSI_DISK0_MAJOR
;
267 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
269 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
272 return 0; /* shut up gcc */
276 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
278 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
281 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
283 struct scsi_disk
*sdkp
= NULL
;
285 if (disk
->private_data
) {
286 sdkp
= scsi_disk(disk
);
287 if (scsi_device_get(sdkp
->device
) == 0)
288 class_device_get(&sdkp
->cdev
);
295 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
297 struct scsi_disk
*sdkp
;
299 mutex_lock(&sd_ref_mutex
);
300 sdkp
= __scsi_disk_get(disk
);
301 mutex_unlock(&sd_ref_mutex
);
305 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
307 struct scsi_disk
*sdkp
;
309 mutex_lock(&sd_ref_mutex
);
310 sdkp
= dev_get_drvdata(dev
);
312 sdkp
= __scsi_disk_get(sdkp
->disk
);
313 mutex_unlock(&sd_ref_mutex
);
317 static void scsi_disk_put(struct scsi_disk
*sdkp
)
319 struct scsi_device
*sdev
= sdkp
->device
;
321 mutex_lock(&sd_ref_mutex
);
322 class_device_put(&sdkp
->cdev
);
323 scsi_device_put(sdev
);
324 mutex_unlock(&sd_ref_mutex
);
328 * sd_init_command - build a scsi (read or write) command from
329 * information in the request structure.
330 * @SCpnt: pointer to mid-level's per scsi command structure that
331 * contains request and into which the scsi command is written
333 * Returns 1 if successful and 0 if error (or cannot be done now).
335 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
337 struct scsi_device
*sdp
= SCpnt
->device
;
338 struct request
*rq
= SCpnt
->request
;
339 struct gendisk
*disk
= rq
->rq_disk
;
340 sector_t block
= rq
->sector
;
341 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
342 unsigned int timeout
= sdp
->timeout
;
344 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
345 "sd_init_command: block=%llu, "
347 (unsigned long long)block
,
350 if (!sdp
|| !scsi_device_online(sdp
) ||
351 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
352 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
353 "Finishing %ld sectors\n",
355 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
356 "Retry with 0x%p\n", SCpnt
));
362 * quietly refuse to do anything to a changed disc until
363 * the changed bit has been reset
365 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
368 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
369 (unsigned long long)block
));
372 * If we have a 1K hardware sectorsize, prevent access to single
373 * 512 byte sectors. In theory we could handle this - in fact
374 * the scsi cdrom driver must be able to handle this because
375 * we typically use 1K blocksizes, and cdroms typically have
376 * 2K hardware sectorsizes. Of course, things are simpler
377 * with the cdrom, since it is read-only. For performance
378 * reasons, the filesystems should be able to handle this
379 * and not force the scsi disk driver to use bounce buffers
382 if (sdp
->sector_size
== 1024) {
383 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
384 scmd_printk(KERN_ERR
, SCpnt
,
385 "Bad block number requested\n");
389 this_count
= this_count
>> 1;
392 if (sdp
->sector_size
== 2048) {
393 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
394 scmd_printk(KERN_ERR
, SCpnt
,
395 "Bad block number requested\n");
399 this_count
= this_count
>> 2;
402 if (sdp
->sector_size
== 4096) {
403 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
404 scmd_printk(KERN_ERR
, SCpnt
,
405 "Bad block number requested\n");
409 this_count
= this_count
>> 3;
412 if (rq_data_dir(rq
) == WRITE
) {
413 if (!sdp
->writeable
) {
416 SCpnt
->cmnd
[0] = WRITE_6
;
417 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
418 } else if (rq_data_dir(rq
) == READ
) {
419 SCpnt
->cmnd
[0] = READ_6
;
420 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
422 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
426 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
427 "%s %d/%ld 512 byte blocks.\n",
428 (rq_data_dir(rq
) == WRITE
) ?
429 "writing" : "reading", this_count
,
434 if (block
> 0xffffffff) {
435 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
436 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
437 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
438 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
439 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
440 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
441 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
442 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
443 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
444 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
445 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
446 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
447 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
448 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
449 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
450 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
451 SCpnt
->device
->use_10_for_rw
) {
452 if (this_count
> 0xffff)
455 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
456 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
457 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
458 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
459 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
460 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
461 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
462 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
463 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
465 if (unlikely(blk_fua_rq(rq
))) {
467 * This happens only if this drive failed
468 * 10byte rw command with ILLEGAL_REQUEST
469 * during operation and thus turned off
472 scmd_printk(KERN_ERR
, SCpnt
,
473 "FUA write on READ/WRITE(6) drive\n");
477 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
478 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
479 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
480 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
483 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
486 * We shouldn't disconnect in the middle of a sector, so with a dumb
487 * host adapter, it's safe to assume that we can at least transfer
488 * this many bytes between each connect / disconnect.
490 SCpnt
->transfersize
= sdp
->sector_size
;
491 SCpnt
->underflow
= this_count
<< 9;
492 SCpnt
->allowed
= SD_MAX_RETRIES
;
493 SCpnt
->timeout_per_command
= timeout
;
496 * This is the completion routine we use. This is matched in terms
497 * of capability to this function.
499 SCpnt
->done
= sd_rw_intr
;
502 * This indicates that the command is ready from our end to be
509 * sd_open - open a scsi disk device
510 * @inode: only i_rdev member may be used
511 * @filp: only f_mode and f_flags may be used
513 * Returns 0 if successful. Returns a negated errno value in case
516 * Note: This can be called from a user context (e.g. fsck(1) )
517 * or from within the kernel (e.g. as a result of a mount(1) ).
518 * In the latter case @inode and @filp carry an abridged amount
519 * of information as noted above.
521 static int sd_open(struct inode
*inode
, struct file
*filp
)
523 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
524 struct scsi_disk
*sdkp
;
525 struct scsi_device
*sdev
;
528 if (!(sdkp
= scsi_disk_get(disk
)))
532 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
537 * If the device is in error recovery, wait until it is done.
538 * If the device is offline, then disallow any access to it.
541 if (!scsi_block_when_processing_errors(sdev
))
544 if (sdev
->removable
|| sdkp
->write_prot
)
545 check_disk_change(inode
->i_bdev
);
548 * If the drive is empty, just let the open fail.
551 if (sdev
->removable
&& !sdkp
->media_present
&&
552 !(filp
->f_flags
& O_NDELAY
))
556 * If the device has the write protect tab set, have the open fail
557 * if the user expects to be able to write to the thing.
560 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
564 * It is possible that the disk changing stuff resulted in
565 * the device being taken offline. If this is the case,
566 * report this to the user, and don't pretend that the
567 * open actually succeeded.
570 if (!scsi_device_online(sdev
))
573 if (!sdkp
->openers
++ && sdev
->removable
) {
574 if (scsi_block_when_processing_errors(sdev
))
575 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
586 * sd_release - invoked when the (last) close(2) is called on this
588 * @inode: only i_rdev member may be used
589 * @filp: only f_mode and f_flags may be used
593 * Note: may block (uninterruptible) if error recovery is underway
596 static int sd_release(struct inode
*inode
, struct file
*filp
)
598 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
599 struct scsi_disk
*sdkp
= scsi_disk(disk
);
600 struct scsi_device
*sdev
= sdkp
->device
;
602 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
604 if (!--sdkp
->openers
&& sdev
->removable
) {
605 if (scsi_block_when_processing_errors(sdev
))
606 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
610 * XXX and what if there are packets in flight and this close()
611 * XXX is followed by a "rmmod sd_mod"?
617 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
619 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
620 struct scsi_device
*sdp
= sdkp
->device
;
621 struct Scsi_Host
*host
= sdp
->host
;
624 /* default to most commonly used values */
625 diskinfo
[0] = 0x40; /* 1 << 6 */
626 diskinfo
[1] = 0x20; /* 1 << 5 */
627 diskinfo
[2] = sdkp
->capacity
>> 11;
629 /* override with calculated, extended default, or driver values */
630 if (host
->hostt
->bios_param
)
631 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
633 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
635 geo
->heads
= diskinfo
[0];
636 geo
->sectors
= diskinfo
[1];
637 geo
->cylinders
= diskinfo
[2];
642 * sd_ioctl - process an ioctl
643 * @inode: only i_rdev/i_bdev members may be used
644 * @filp: only f_mode and f_flags may be used
645 * @cmd: ioctl command number
646 * @arg: this is third argument given to ioctl(2) system call.
647 * Often contains a pointer.
649 * Returns 0 if successful (some ioctls return postive numbers on
650 * success as well). Returns a negated errno value in case of error.
652 * Note: most ioctls are forward onto the block subsystem or further
653 * down in the scsi subsytem.
655 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
656 unsigned int cmd
, unsigned long arg
)
658 struct block_device
*bdev
= inode
->i_bdev
;
659 struct gendisk
*disk
= bdev
->bd_disk
;
660 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
661 void __user
*p
= (void __user
*)arg
;
664 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
665 disk
->disk_name
, cmd
));
668 * If we are in the middle of error recovery, don't let anyone
669 * else try and use this device. Also, if error recovery fails, it
670 * may try and take the device offline, in which case all further
671 * access to the device is prohibited.
673 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
674 if (!scsi_block_when_processing_errors(sdp
) || !error
)
678 * Send SCSI addressing ioctls directly to mid level, send other
679 * ioctls to block level and then onto mid level if they can't be
683 case SCSI_IOCTL_GET_IDLUN
:
684 case SCSI_IOCTL_GET_BUS_NUMBER
:
685 return scsi_ioctl(sdp
, cmd
, p
);
687 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
688 if (error
!= -ENOTTY
)
691 return scsi_ioctl(sdp
, cmd
, p
);
694 static void set_media_not_present(struct scsi_disk
*sdkp
)
696 sdkp
->media_present
= 0;
698 sdkp
->device
->changed
= 1;
702 * sd_media_changed - check if our medium changed
703 * @disk: kernel device descriptor
705 * Returns 0 if not applicable or no change; 1 if change
707 * Note: this function is invoked from the block subsystem.
709 static int sd_media_changed(struct gendisk
*disk
)
711 struct scsi_disk
*sdkp
= scsi_disk(disk
);
712 struct scsi_device
*sdp
= sdkp
->device
;
715 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
721 * If the device is offline, don't send any commands - just pretend as
722 * if the command failed. If the device ever comes back online, we
723 * can deal with it then. It is only because of unrecoverable errors
724 * that we would ever take a device offline in the first place.
726 if (!scsi_device_online(sdp
))
730 * Using TEST_UNIT_READY enables differentiation between drive with
731 * no cartridge loaded - NOT READY, drive with changed cartridge -
732 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
734 * Drives that auto spin down. eg iomega jaz 1G, will be started
735 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
736 * sd_revalidate() is called.
739 if (scsi_block_when_processing_errors(sdp
))
740 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
743 * Unable to test, unit probably not ready. This usually
744 * means there is no disc in the drive. Mark as changed,
745 * and we will figure it out later once the drive is
752 * For removable scsi disk we have to recognise the presence
753 * of a disk in the drive. This is kept in the struct scsi_disk
754 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
756 sdkp
->media_present
= 1;
758 retval
= sdp
->changed
;
764 set_media_not_present(sdkp
);
768 static int sd_sync_cache(struct scsi_disk
*sdkp
)
771 struct scsi_device
*sdp
= sdkp
->device
;
772 struct scsi_sense_hdr sshdr
;
774 if (!scsi_device_online(sdp
))
778 for (retries
= 3; retries
> 0; --retries
) {
779 unsigned char cmd
[10] = { 0 };
781 cmd
[0] = SYNCHRONIZE_CACHE
;
783 * Leave the rest of the command zero to indicate
786 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
787 SD_TIMEOUT
, SD_MAX_RETRIES
);
793 sd_print_result(sdkp
, res
);
794 if (driver_byte(res
) & DRIVER_SENSE
)
795 sd_print_sense_hdr(sdkp
, &sshdr
);
803 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
806 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
812 ret
= sd_sync_cache(sdkp
);
817 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
819 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
820 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
821 rq
->timeout
= SD_TIMEOUT
;
822 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
826 static void sd_rescan(struct device
*dev
)
828 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
831 sd_revalidate_disk(sdkp
->disk
);
839 * This gets directly called from VFS. When the ioctl
840 * is not recognized we go back to the other translation paths.
842 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
844 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
845 struct gendisk
*disk
= bdev
->bd_disk
;
846 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
849 * If we are in the middle of error recovery, don't let anyone
850 * else try and use this device. Also, if error recovery fails, it
851 * may try and take the device offline, in which case all further
852 * access to the device is prohibited.
854 if (!scsi_block_when_processing_errors(sdev
))
857 if (sdev
->host
->hostt
->compat_ioctl
) {
860 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
866 * Let the static ioctl translation table take care of it.
872 static struct block_device_operations sd_fops
= {
873 .owner
= THIS_MODULE
,
875 .release
= sd_release
,
879 .compat_ioctl
= sd_compat_ioctl
,
881 .media_changed
= sd_media_changed
,
882 .revalidate_disk
= sd_revalidate_disk
,
886 * sd_rw_intr - bottom half handler: called when the lower level
887 * driver has completed (successfully or otherwise) a scsi command.
888 * @SCpnt: mid-level's per command structure.
890 * Note: potentially run from within an ISR. Must not block.
892 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
894 int result
= SCpnt
->result
;
895 unsigned int xfer_size
= SCpnt
->request_bufflen
;
896 unsigned int good_bytes
= result
? 0 : xfer_size
;
897 u64 start_lba
= SCpnt
->request
->sector
;
898 u64 end_lba
= SCpnt
->request
->sector
+ (xfer_size
/ 512);
900 struct scsi_sense_hdr sshdr
;
902 int sense_deferred
= 0;
906 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
908 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
910 #ifdef CONFIG_SCSI_LOGGING
911 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
913 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
914 "sd_rw_intr: sb[respc,sk,asc,"
915 "ascq]=%x,%x,%x,%x\n",
917 sshdr
.sense_key
, sshdr
.asc
,
921 if (driver_byte(result
) != DRIVER_SENSE
&&
922 (!sense_valid
|| sense_deferred
))
925 switch (sshdr
.sense_key
) {
928 if (!blk_fs_request(SCpnt
->request
))
930 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
931 SCSI_SENSE_BUFFERSIZE
,
935 if (xfer_size
<= SCpnt
->device
->sector_size
)
937 if (SCpnt
->device
->sector_size
< 512) {
938 /* only legitimate sector_size here is 256 */
942 /* be careful ... don't want any overflows */
943 u64 factor
= SCpnt
->device
->sector_size
/ 512;
944 do_div(start_lba
, factor
);
945 do_div(end_lba
, factor
);
948 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
949 /* the bad lba was reported incorrectly, we have
950 * no idea where the error is
954 /* This computation should always be done in terms of
955 * the resolution of the device's medium.
957 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
959 case RECOVERED_ERROR
:
961 /* Inform the user, but make sure that it's not treated
964 scsi_print_sense("sd", SCpnt
);
966 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
967 good_bytes
= xfer_size
;
969 case ILLEGAL_REQUEST
:
970 if (SCpnt
->device
->use_10_for_rw
&&
971 (SCpnt
->cmnd
[0] == READ_10
||
972 SCpnt
->cmnd
[0] == WRITE_10
))
973 SCpnt
->device
->use_10_for_rw
= 0;
974 if (SCpnt
->device
->use_10_for_ms
&&
975 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
976 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
977 SCpnt
->device
->use_10_for_ms
= 0;
983 scsi_io_completion(SCpnt
, good_bytes
);
986 static int media_not_present(struct scsi_disk
*sdkp
,
987 struct scsi_sense_hdr
*sshdr
)
990 if (!scsi_sense_valid(sshdr
))
992 /* not invoked for commands that could return deferred errors */
993 if (sshdr
->sense_key
!= NOT_READY
&&
994 sshdr
->sense_key
!= UNIT_ATTENTION
)
996 if (sshdr
->asc
!= 0x3A) /* medium not present */
999 set_media_not_present(sdkp
);
1004 * spinup disk - called only in sd_revalidate_disk()
1007 sd_spinup_disk(struct scsi_disk
*sdkp
)
1009 unsigned char cmd
[10];
1010 unsigned long spintime_expire
= 0;
1011 int retries
, spintime
;
1012 unsigned int the_result
;
1013 struct scsi_sense_hdr sshdr
;
1014 int sense_valid
= 0;
1018 /* Spin up drives, as required. Only do this at boot time */
1019 /* Spinup needs to be done for module loads too. */
1024 cmd
[0] = TEST_UNIT_READY
;
1025 memset((void *) &cmd
[1], 0, 9);
1027 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1033 * If the drive has indicated to us that it
1034 * doesn't have any media in it, don't bother
1035 * with any more polling.
1037 if (media_not_present(sdkp
, &sshdr
))
1041 sense_valid
= scsi_sense_valid(&sshdr
);
1043 } while (retries
< 3 &&
1044 (!scsi_status_is_good(the_result
) ||
1045 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1046 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1048 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1049 /* no sense, TUR either succeeded or failed
1050 * with a status error */
1051 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1052 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1053 sd_print_result(sdkp
, the_result
);
1059 * The device does not want the automatic start to be issued.
1061 if (sdkp
->device
->no_start_on_add
) {
1066 * If manual intervention is required, or this is an
1067 * absent USB storage device, a spinup is meaningless.
1070 sshdr
.sense_key
== NOT_READY
&&
1071 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1072 break; /* manual intervention required */
1075 * Issue command to spin up drive when not ready
1077 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1079 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1080 cmd
[0] = START_STOP
;
1081 cmd
[1] = 1; /* Return immediately */
1082 memset((void *) &cmd
[2], 0, 8);
1083 cmd
[4] = 1; /* Start spin cycle */
1084 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1086 SD_TIMEOUT
, SD_MAX_RETRIES
);
1087 spintime_expire
= jiffies
+ 100 * HZ
;
1090 /* Wait 1 second for next try */
1095 * Wait for USB flash devices with slow firmware.
1096 * Yes, this sense key/ASC combination shouldn't
1097 * occur here. It's characteristic of these devices.
1099 } else if (sense_valid
&&
1100 sshdr
.sense_key
== UNIT_ATTENTION
&&
1101 sshdr
.asc
== 0x28) {
1103 spintime_expire
= jiffies
+ 5 * HZ
;
1106 /* Wait 1 second for next try */
1109 /* we don't understand the sense code, so it's
1110 * probably pointless to loop */
1112 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1113 sd_print_sense_hdr(sdkp
, &sshdr
);
1118 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1121 if (scsi_status_is_good(the_result
))
1124 printk("not responding...\n");
1129 * read disk capacity
1132 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1134 unsigned char cmd
[16];
1135 int the_result
, retries
;
1136 int sector_size
= 0;
1138 struct scsi_sense_hdr sshdr
;
1139 int sense_valid
= 0;
1140 struct scsi_device
*sdp
= sdkp
->device
;
1146 memset((void *) cmd
, 0, 16);
1147 cmd
[0] = SERVICE_ACTION_IN
;
1148 cmd
[1] = SAI_READ_CAPACITY_16
;
1150 memset((void *) buffer
, 0, 12);
1152 cmd
[0] = READ_CAPACITY
;
1153 memset((void *) &cmd
[1], 0, 9);
1154 memset((void *) buffer
, 0, 8);
1157 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1158 buffer
, longrc
? 12 : 8, &sshdr
,
1159 SD_TIMEOUT
, SD_MAX_RETRIES
);
1161 if (media_not_present(sdkp
, &sshdr
))
1165 sense_valid
= scsi_sense_valid(&sshdr
);
1168 } while (the_result
&& retries
);
1170 if (the_result
&& !longrc
) {
1171 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1172 sd_print_result(sdkp
, the_result
);
1173 if (driver_byte(the_result
) & DRIVER_SENSE
)
1174 sd_print_sense_hdr(sdkp
, &sshdr
);
1176 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1178 /* Set dirty bit for removable devices if not ready -
1179 * sometimes drives will not report this properly. */
1180 if (sdp
->removable
&&
1181 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1184 /* Either no media are present but the drive didn't tell us,
1185 or they are present but the read capacity command fails */
1186 /* sdkp->media_present = 0; -- not always correct */
1187 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1190 } else if (the_result
&& longrc
) {
1191 /* READ CAPACITY(16) has been failed */
1192 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1193 sd_print_result(sdkp
, the_result
);
1194 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1196 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1201 sector_size
= (buffer
[4] << 24) |
1202 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1203 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1204 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1205 if(sizeof(sdkp
->capacity
) > 4) {
1206 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1207 "Trying to use READ CAPACITY(16).\n");
1211 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1212 "a kernel compiled with support for large "
1213 "block devices.\n");
1217 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1222 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1223 ((u64
)buffer
[1] << 48) |
1224 ((u64
)buffer
[2] << 40) |
1225 ((u64
)buffer
[3] << 32) |
1226 ((sector_t
)buffer
[4] << 24) |
1227 ((sector_t
)buffer
[5] << 16) |
1228 ((sector_t
)buffer
[6] << 8) |
1229 (sector_t
)buffer
[7]);
1231 sector_size
= (buffer
[8] << 24) |
1232 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1235 /* Some devices return the total number of sectors, not the
1236 * highest sector number. Make the necessary adjustment. */
1237 if (sdp
->fix_capacity
) {
1240 /* Some devices have version which report the correct sizes
1241 * and others which do not. We guess size according to a heuristic
1242 * and err on the side of lowering the capacity. */
1244 if (sdp
->guess_capacity
)
1245 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1250 if (sector_size
== 0) {
1252 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1256 if (sector_size
!= 512 &&
1257 sector_size
!= 1024 &&
1258 sector_size
!= 2048 &&
1259 sector_size
!= 4096 &&
1260 sector_size
!= 256) {
1261 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1264 * The user might want to re-format the drive with
1265 * a supported sectorsize. Once this happens, it
1266 * would be relatively trivial to set the thing up.
1267 * For this reason, we leave the thing in the table.
1271 * set a bogus sector size so the normal read/write
1272 * logic in the block layer will eventually refuse any
1273 * request on this device without tripping over power
1274 * of two sector size assumptions
1280 * The msdos fs needs to know the hardware sector size
1281 * So I have created this table. See ll_rw_blk.c
1282 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1284 int hard_sector
= sector_size
;
1285 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1286 request_queue_t
*queue
= sdp
->request_queue
;
1289 blk_queue_hardsect_size(queue
, hard_sector
);
1290 /* avoid 64-bit division on 32-bit platforms */
1291 sector_div(sz
, 625);
1293 sector_div(mb
, 1950);
1295 sd_printk(KERN_NOTICE
, sdkp
,
1296 "%llu %d-byte hardware sectors (%llu MB)\n",
1297 (unsigned long long)sdkp
->capacity
,
1298 hard_sector
, (unsigned long long)mb
);
1301 /* Rescale capacity to 512-byte units */
1302 if (sector_size
== 4096)
1303 sdkp
->capacity
<<= 3;
1304 else if (sector_size
== 2048)
1305 sdkp
->capacity
<<= 2;
1306 else if (sector_size
== 1024)
1307 sdkp
->capacity
<<= 1;
1308 else if (sector_size
== 256)
1309 sdkp
->capacity
>>= 1;
1311 sdkp
->device
->sector_size
= sector_size
;
1314 /* called with buffer of length 512 */
1316 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1317 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1318 struct scsi_sense_hdr
*sshdr
)
1320 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1321 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1326 * read write protect setting, if possible - called only in sd_revalidate_disk()
1327 * called with buffer of length SD_BUF_SIZE
1330 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1333 struct scsi_device
*sdp
= sdkp
->device
;
1334 struct scsi_mode_data data
;
1336 set_disk_ro(sdkp
->disk
, 0);
1337 if (sdp
->skip_ms_page_3f
) {
1338 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1342 if (sdp
->use_192_bytes_for_3f
) {
1343 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1346 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1347 * We have to start carefully: some devices hang if we ask
1348 * for more than is available.
1350 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1353 * Second attempt: ask for page 0 When only page 0 is
1354 * implemented, a request for page 3F may return Sense Key
1355 * 5: Illegal Request, Sense Code 24: Invalid field in
1358 if (!scsi_status_is_good(res
))
1359 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1362 * Third attempt: ask 255 bytes, as we did earlier.
1364 if (!scsi_status_is_good(res
))
1365 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1369 if (!scsi_status_is_good(res
)) {
1370 sd_printk(KERN_WARNING
, sdkp
,
1371 "Test WP failed, assume Write Enabled\n");
1373 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1374 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1375 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1376 sdkp
->write_prot
? "on" : "off");
1377 sd_printk(KERN_DEBUG
, sdkp
,
1378 "Mode Sense: %02x %02x %02x %02x\n",
1379 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1384 * sd_read_cache_type - called only from sd_revalidate_disk()
1385 * called with buffer of length SD_BUF_SIZE
1388 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1391 struct scsi_device
*sdp
= sdkp
->device
;
1395 struct scsi_mode_data data
;
1396 struct scsi_sense_hdr sshdr
;
1398 if (sdp
->skip_ms_page_8
)
1401 if (sdp
->type
== TYPE_RBC
) {
1409 /* cautiously ask */
1410 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1412 if (!scsi_status_is_good(res
))
1415 if (!data
.header_length
) {
1417 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1420 /* that went OK, now ask for the proper length */
1424 * We're only interested in the first three bytes, actually.
1425 * But the data cache page is defined for the first 20.
1432 /* Take headers and block descriptors into account */
1433 len
+= data
.header_length
+ data
.block_descriptor_length
;
1434 if (len
> SD_BUF_SIZE
)
1438 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1440 if (scsi_status_is_good(res
)) {
1441 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1443 if (offset
>= SD_BUF_SIZE
- 2) {
1444 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1448 if ((buffer
[offset
] & 0x3f) != modepage
) {
1449 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1453 if (modepage
== 8) {
1454 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1455 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1457 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1461 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1462 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1463 sd_printk(KERN_NOTICE
, sdkp
,
1464 "Uses READ/WRITE(6), disabling FUA\n");
1468 sd_printk(KERN_NOTICE
, sdkp
,
1469 "Write cache: %s, read cache: %s, %s\n",
1470 sdkp
->WCE
? "enabled" : "disabled",
1471 sdkp
->RCD
? "disabled" : "enabled",
1472 sdkp
->DPOFUA
? "supports DPO and FUA"
1473 : "doesn't support DPO or FUA");
1479 if (scsi_sense_valid(&sshdr
) &&
1480 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1481 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1482 /* Invalid field in CDB */
1483 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1485 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1488 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1495 * sd_revalidate_disk - called the first time a new disk is seen,
1496 * performs disk spin up, read_capacity, etc.
1497 * @disk: struct gendisk we care about
1499 static int sd_revalidate_disk(struct gendisk
*disk
)
1501 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1502 struct scsi_device
*sdp
= sdkp
->device
;
1503 unsigned char *buffer
;
1506 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1507 "sd_revalidate_disk\n"));
1510 * If the device is offline, don't try and read capacity or any
1511 * of the other niceties.
1513 if (!scsi_device_online(sdp
))
1516 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
| __GFP_DMA
);
1518 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1519 "allocation failure.\n");
1523 /* defaults, until the device tells us otherwise */
1524 sdp
->sector_size
= 512;
1526 sdkp
->media_present
= 1;
1527 sdkp
->write_prot
= 0;
1531 sd_spinup_disk(sdkp
);
1534 * Without media there is no reason to ask; moreover, some devices
1535 * react badly if we do.
1537 if (sdkp
->media_present
) {
1538 sd_read_capacity(sdkp
, buffer
);
1539 sd_read_write_protect_flag(sdkp
, buffer
);
1540 sd_read_cache_type(sdkp
, buffer
);
1544 * We now have all cache related info, determine how we deal
1545 * with ordered requests. Note that as the current SCSI
1546 * dispatch function can alter request order, we cannot use
1547 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1550 ordered
= sdkp
->DPOFUA
1551 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1553 ordered
= QUEUE_ORDERED_DRAIN
;
1555 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1557 set_capacity(disk
, sdkp
->capacity
);
1565 * sd_probe - called during driver initialization and whenever a
1566 * new scsi device is attached to the system. It is called once
1567 * for each scsi device (not just disks) present.
1568 * @dev: pointer to device object
1570 * Returns 0 if successful (or not interested in this scsi device
1571 * (e.g. scanner)); 1 when there is an error.
1573 * Note: this function is invoked from the scsi mid-level.
1574 * This function sets up the mapping between a given
1575 * <host,channel,id,lun> (found in sdp) and new device name
1576 * (e.g. /dev/sda). More precisely it is the block device major
1577 * and minor number that is chosen here.
1579 * Assume sd_attach is not re-entrant (for time being)
1580 * Also think about sd_attach() and sd_remove() running coincidentally.
1582 static int sd_probe(struct device
*dev
)
1584 struct scsi_device
*sdp
= to_scsi_device(dev
);
1585 struct scsi_disk
*sdkp
;
1591 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1594 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1598 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1602 gd
= alloc_disk(16);
1606 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1609 spin_lock(&sd_index_lock
);
1610 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1611 spin_unlock(&sd_index_lock
);
1613 if (index
>= SD_MAX_DISKS
)
1619 sdkp
->driver
= &sd_template
;
1621 sdkp
->index
= index
;
1624 if (!sdp
->timeout
) {
1625 if (sdp
->type
!= TYPE_MOD
)
1626 sdp
->timeout
= SD_TIMEOUT
;
1628 sdp
->timeout
= SD_MOD_TIMEOUT
;
1631 class_device_initialize(&sdkp
->cdev
);
1632 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1633 sdkp
->cdev
.class = &sd_disk_class
;
1634 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1636 if (class_device_add(&sdkp
->cdev
))
1639 get_device(&sdp
->sdev_gendev
);
1641 gd
->major
= sd_major((index
& 0xf0) >> 4);
1642 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1644 gd
->fops
= &sd_fops
;
1647 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1648 } else if (index
< (26 + 1) * 26) {
1649 sprintf(gd
->disk_name
, "sd%c%c",
1650 'a' + index
/ 26 - 1,'a' + index
% 26);
1652 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1653 const unsigned int m2
= (index
/ 26 - 1) % 26;
1654 const unsigned int m3
= index
% 26;
1655 sprintf(gd
->disk_name
, "sd%c%c%c",
1656 'a' + m1
, 'a' + m2
, 'a' + m3
);
1659 gd
->private_data
= &sdkp
->driver
;
1660 gd
->queue
= sdkp
->device
->request_queue
;
1662 sd_revalidate_disk(gd
);
1664 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1665 gd
->flags
= GENHD_FL_DRIVERFS
;
1667 gd
->flags
|= GENHD_FL_REMOVABLE
;
1669 dev_set_drvdata(dev
, sdkp
);
1672 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1673 sdp
->removable
? "removable " : "");
1686 * sd_remove - called whenever a scsi disk (previously recognized by
1687 * sd_probe) is detached from the system. It is called (potentially
1688 * multiple times) during sd module unload.
1689 * @sdp: pointer to mid level scsi device object
1691 * Note: this function is invoked from the scsi mid-level.
1692 * This function potentially frees up a device name (e.g. /dev/sdc)
1693 * that could be re-used by a subsequent sd_probe().
1694 * This function is not called when the built-in sd driver is "exit-ed".
1696 static int sd_remove(struct device
*dev
)
1698 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1700 class_device_del(&sdkp
->cdev
);
1701 del_gendisk(sdkp
->disk
);
1704 mutex_lock(&sd_ref_mutex
);
1705 dev_set_drvdata(dev
, NULL
);
1706 class_device_put(&sdkp
->cdev
);
1707 mutex_unlock(&sd_ref_mutex
);
1713 * scsi_disk_release - Called to free the scsi_disk structure
1714 * @cdev: pointer to embedded class device
1716 * sd_ref_mutex must be held entering this routine. Because it is
1717 * called on last put, you should always use the scsi_disk_get()
1718 * scsi_disk_put() helpers which manipulate the semaphore directly
1719 * and never do a direct class_device_put().
1721 static void scsi_disk_release(struct class_device
*cdev
)
1723 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1724 struct gendisk
*disk
= sdkp
->disk
;
1726 spin_lock(&sd_index_lock
);
1727 idr_remove(&sd_index_idr
, sdkp
->index
);
1728 spin_unlock(&sd_index_lock
);
1730 disk
->private_data
= NULL
;
1732 put_device(&sdkp
->device
->sdev_gendev
);
1737 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1739 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1740 struct scsi_sense_hdr sshdr
;
1741 struct scsi_device
*sdp
= sdkp
->device
;
1745 cmd
[4] |= 1; /* START */
1747 if (!scsi_device_online(sdp
))
1750 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1751 SD_TIMEOUT
, SD_MAX_RETRIES
);
1753 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1754 sd_print_result(sdkp
, res
);
1755 if (driver_byte(res
) & DRIVER_SENSE
)
1756 sd_print_sense_hdr(sdkp
, &sshdr
);
1763 * Send a SYNCHRONIZE CACHE instruction down to the device through
1764 * the normal SCSI command structure. Wait for the command to
1767 static void sd_shutdown(struct device
*dev
)
1769 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1772 return; /* this can happen */
1775 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1776 sd_sync_cache(sdkp
);
1779 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1780 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1781 sd_start_stop_device(sdkp
, 0);
1784 scsi_disk_put(sdkp
);
1787 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1789 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1793 return 0; /* this can happen */
1796 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1797 ret
= sd_sync_cache(sdkp
);
1802 if (mesg
.event
== PM_EVENT_SUSPEND
&&
1803 sdkp
->device
->manage_start_stop
) {
1804 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1805 ret
= sd_start_stop_device(sdkp
, 0);
1809 scsi_disk_put(sdkp
);
1813 static int sd_resume(struct device
*dev
)
1815 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1818 if (!sdkp
->device
->manage_start_stop
)
1821 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
1822 ret
= sd_start_stop_device(sdkp
, 1);
1825 scsi_disk_put(sdkp
);
1830 * init_sd - entry point for this driver (both when built in or when
1833 * Note: this function registers this driver with the scsi mid-level.
1835 static int __init
init_sd(void)
1837 int majors
= 0, i
, err
;
1839 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1841 for (i
= 0; i
< SD_MAJORS
; i
++)
1842 if (register_blkdev(sd_major(i
), "sd") == 0)
1848 err
= class_register(&sd_disk_class
);
1852 err
= scsi_register_driver(&sd_template
.gendrv
);
1859 class_unregister(&sd_disk_class
);
1861 for (i
= 0; i
< SD_MAJORS
; i
++)
1862 unregister_blkdev(sd_major(i
), "sd");
1867 * exit_sd - exit point for this driver (when it is a module).
1869 * Note: this function unregisters this driver from the scsi mid-level.
1871 static void __exit
exit_sd(void)
1875 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1877 scsi_unregister_driver(&sd_template
.gendrv
);
1878 class_unregister(&sd_disk_class
);
1880 for (i
= 0; i
< SD_MAJORS
; i
++)
1881 unregister_blkdev(sd_major(i
), "sd");
1884 module_init(init_sd
);
1885 module_exit(exit_sd
);
1887 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1888 struct scsi_sense_hdr
*sshdr
)
1890 sd_printk(KERN_INFO
, sdkp
, "");
1891 scsi_show_sense_hdr(sshdr
);
1892 sd_printk(KERN_INFO
, sdkp
, "");
1893 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1896 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1898 sd_printk(KERN_INFO
, sdkp
, "");
1899 scsi_show_result(result
);