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
);
86 static DEFINE_IDR(sd_index_idr
);
87 static DEFINE_SPINLOCK(sd_index_lock
);
89 /* This semaphore is used to mediate the 0->1 reference get in the
90 * face of object destruction (i.e. we can't allow a get on an
91 * object after last put) */
92 static DEFINE_MUTEX(sd_ref_mutex
);
94 static const char *sd_cache_types
[] = {
95 "write through", "none", "write back",
96 "write back, no read (daft)"
99 static ssize_t
sd_store_cache_type(struct class_device
*cdev
, const char *buf
,
102 int i
, ct
= -1, rcd
, wce
, sp
;
103 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
104 struct scsi_device
*sdp
= sdkp
->device
;
107 struct scsi_mode_data data
;
108 struct scsi_sense_hdr sshdr
;
111 if (sdp
->type
!= TYPE_DISK
)
112 /* no cache control on RBC devices; theoretically they
113 * can do it, but there's probably so many exceptions
114 * it's not worth the risk */
117 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
118 const int len
= strlen(sd_cache_types
[i
]);
119 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
127 rcd
= ct
& 0x01 ? 1 : 0;
128 wce
= ct
& 0x02 ? 1 : 0;
129 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
130 SD_MAX_RETRIES
, &data
, NULL
))
132 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
133 data
.block_descriptor_length
);
134 buffer_data
= buffer
+ data
.header_length
+
135 data
.block_descriptor_length
;
136 buffer_data
[2] &= ~0x05;
137 buffer_data
[2] |= wce
<< 2 | rcd
;
138 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
140 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
141 SD_MAX_RETRIES
, &data
, &sshdr
)) {
142 if (scsi_sense_valid(&sshdr
))
143 sd_print_sense_hdr(sdkp
, &sshdr
);
146 sd_revalidate_disk(sdkp
->disk
);
150 static ssize_t
sd_store_allow_restart(struct class_device
*cdev
, const char *buf
,
153 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
154 struct scsi_device
*sdp
= sdkp
->device
;
156 if (!capable(CAP_SYS_ADMIN
))
159 if (sdp
->type
!= TYPE_DISK
)
162 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
167 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
169 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
170 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
172 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
175 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
177 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
179 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
182 static ssize_t
sd_show_allow_restart(struct class_device
*cdev
, char *buf
)
184 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
186 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
189 static struct class_device_attribute sd_disk_attrs
[] = {
190 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
191 sd_store_cache_type
),
192 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
193 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
194 sd_store_allow_restart
),
198 static struct class sd_disk_class
= {
200 .owner
= THIS_MODULE
,
201 .release
= scsi_disk_release
,
202 .class_dev_attrs
= sd_disk_attrs
,
205 static struct scsi_driver sd_template
= {
206 .owner
= THIS_MODULE
,
211 .shutdown
= sd_shutdown
,
214 .init_command
= sd_init_command
,
215 .issue_flush
= sd_issue_flush
,
219 * Device no to disk mapping:
221 * major disc2 disc p1
222 * |............|.............|....|....| <- dev_t
225 * Inside a major, we have 16k disks, however mapped non-
226 * contiguously. The first 16 disks are for major0, the next
227 * ones with major1, ... Disk 256 is for major0 again, disk 272
229 * As we stay compatible with our numbering scheme, we can reuse
230 * the well-know SCSI majors 8, 65--71, 136--143.
232 static int sd_major(int major_idx
)
236 return SCSI_DISK0_MAJOR
;
238 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
240 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
243 return 0; /* shut up gcc */
247 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
249 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
252 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
254 struct scsi_disk
*sdkp
= NULL
;
256 if (disk
->private_data
) {
257 sdkp
= scsi_disk(disk
);
258 if (scsi_device_get(sdkp
->device
) == 0)
259 class_device_get(&sdkp
->cdev
);
266 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
268 struct scsi_disk
*sdkp
;
270 mutex_lock(&sd_ref_mutex
);
271 sdkp
= __scsi_disk_get(disk
);
272 mutex_unlock(&sd_ref_mutex
);
276 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
278 struct scsi_disk
*sdkp
;
280 mutex_lock(&sd_ref_mutex
);
281 sdkp
= dev_get_drvdata(dev
);
283 sdkp
= __scsi_disk_get(sdkp
->disk
);
284 mutex_unlock(&sd_ref_mutex
);
288 static void scsi_disk_put(struct scsi_disk
*sdkp
)
290 struct scsi_device
*sdev
= sdkp
->device
;
292 mutex_lock(&sd_ref_mutex
);
293 class_device_put(&sdkp
->cdev
);
294 scsi_device_put(sdev
);
295 mutex_unlock(&sd_ref_mutex
);
299 * sd_init_command - build a scsi (read or write) command from
300 * information in the request structure.
301 * @SCpnt: pointer to mid-level's per scsi command structure that
302 * contains request and into which the scsi command is written
304 * Returns 1 if successful and 0 if error (or cannot be done now).
306 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
308 struct scsi_device
*sdp
= SCpnt
->device
;
309 struct request
*rq
= SCpnt
->request
;
310 struct gendisk
*disk
= rq
->rq_disk
;
311 sector_t block
= rq
->sector
;
312 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
313 unsigned int timeout
= sdp
->timeout
;
315 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
316 "sd_init_command: block=%llu, "
318 (unsigned long long)block
,
321 if (!sdp
|| !scsi_device_online(sdp
) ||
322 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
323 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
324 "Finishing %ld sectors\n",
326 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
327 "Retry with 0x%p\n", SCpnt
));
333 * quietly refuse to do anything to a changed disc until
334 * the changed bit has been reset
336 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
339 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
340 (unsigned long long)block
));
343 * If we have a 1K hardware sectorsize, prevent access to single
344 * 512 byte sectors. In theory we could handle this - in fact
345 * the scsi cdrom driver must be able to handle this because
346 * we typically use 1K blocksizes, and cdroms typically have
347 * 2K hardware sectorsizes. Of course, things are simpler
348 * with the cdrom, since it is read-only. For performance
349 * reasons, the filesystems should be able to handle this
350 * and not force the scsi disk driver to use bounce buffers
353 if (sdp
->sector_size
== 1024) {
354 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
355 scmd_printk(KERN_ERR
, SCpnt
,
356 "Bad block number requested\n");
360 this_count
= this_count
>> 1;
363 if (sdp
->sector_size
== 2048) {
364 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
365 scmd_printk(KERN_ERR
, SCpnt
,
366 "Bad block number requested\n");
370 this_count
= this_count
>> 2;
373 if (sdp
->sector_size
== 4096) {
374 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
375 scmd_printk(KERN_ERR
, SCpnt
,
376 "Bad block number requested\n");
380 this_count
= this_count
>> 3;
383 if (rq_data_dir(rq
) == WRITE
) {
384 if (!sdp
->writeable
) {
387 SCpnt
->cmnd
[0] = WRITE_6
;
388 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
389 } else if (rq_data_dir(rq
) == READ
) {
390 SCpnt
->cmnd
[0] = READ_6
;
391 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
393 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
397 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
398 "%s %d/%ld 512 byte blocks.\n",
399 (rq_data_dir(rq
) == WRITE
) ?
400 "writing" : "reading", this_count
,
405 if (block
> 0xffffffff) {
406 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
407 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
408 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
409 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
410 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
411 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
412 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
413 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
414 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
415 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
416 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
417 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
418 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
419 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
420 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
421 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
422 SCpnt
->device
->use_10_for_rw
) {
423 if (this_count
> 0xffff)
426 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
427 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
428 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
429 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
430 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
431 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
432 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
433 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
434 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
436 if (unlikely(blk_fua_rq(rq
))) {
438 * This happens only if this drive failed
439 * 10byte rw command with ILLEGAL_REQUEST
440 * during operation and thus turned off
443 scmd_printk(KERN_ERR
, SCpnt
,
444 "FUA write on READ/WRITE(6) drive\n");
448 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
449 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
450 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
451 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
454 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
457 * We shouldn't disconnect in the middle of a sector, so with a dumb
458 * host adapter, it's safe to assume that we can at least transfer
459 * this many bytes between each connect / disconnect.
461 SCpnt
->transfersize
= sdp
->sector_size
;
462 SCpnt
->underflow
= this_count
<< 9;
463 SCpnt
->allowed
= SD_MAX_RETRIES
;
464 SCpnt
->timeout_per_command
= timeout
;
467 * This is the completion routine we use. This is matched in terms
468 * of capability to this function.
470 SCpnt
->done
= sd_rw_intr
;
473 * This indicates that the command is ready from our end to be
480 * sd_open - open a scsi disk device
481 * @inode: only i_rdev member may be used
482 * @filp: only f_mode and f_flags may be used
484 * Returns 0 if successful. Returns a negated errno value in case
487 * Note: This can be called from a user context (e.g. fsck(1) )
488 * or from within the kernel (e.g. as a result of a mount(1) ).
489 * In the latter case @inode and @filp carry an abridged amount
490 * of information as noted above.
492 static int sd_open(struct inode
*inode
, struct file
*filp
)
494 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
495 struct scsi_disk
*sdkp
;
496 struct scsi_device
*sdev
;
499 if (!(sdkp
= scsi_disk_get(disk
)))
503 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
508 * If the device is in error recovery, wait until it is done.
509 * If the device is offline, then disallow any access to it.
512 if (!scsi_block_when_processing_errors(sdev
))
515 if (sdev
->removable
|| sdkp
->write_prot
)
516 check_disk_change(inode
->i_bdev
);
519 * If the drive is empty, just let the open fail.
522 if (sdev
->removable
&& !sdkp
->media_present
&&
523 !(filp
->f_flags
& O_NDELAY
))
527 * If the device has the write protect tab set, have the open fail
528 * if the user expects to be able to write to the thing.
531 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
535 * It is possible that the disk changing stuff resulted in
536 * the device being taken offline. If this is the case,
537 * report this to the user, and don't pretend that the
538 * open actually succeeded.
541 if (!scsi_device_online(sdev
))
544 if (!sdkp
->openers
++ && sdev
->removable
) {
545 if (scsi_block_when_processing_errors(sdev
))
546 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
557 * sd_release - invoked when the (last) close(2) is called on this
559 * @inode: only i_rdev member may be used
560 * @filp: only f_mode and f_flags may be used
564 * Note: may block (uninterruptible) if error recovery is underway
567 static int sd_release(struct inode
*inode
, struct file
*filp
)
569 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
570 struct scsi_disk
*sdkp
= scsi_disk(disk
);
571 struct scsi_device
*sdev
= sdkp
->device
;
573 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
575 if (!--sdkp
->openers
&& sdev
->removable
) {
576 if (scsi_block_when_processing_errors(sdev
))
577 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
581 * XXX and what if there are packets in flight and this close()
582 * XXX is followed by a "rmmod sd_mod"?
588 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
590 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
591 struct scsi_device
*sdp
= sdkp
->device
;
592 struct Scsi_Host
*host
= sdp
->host
;
595 /* default to most commonly used values */
596 diskinfo
[0] = 0x40; /* 1 << 6 */
597 diskinfo
[1] = 0x20; /* 1 << 5 */
598 diskinfo
[2] = sdkp
->capacity
>> 11;
600 /* override with calculated, extended default, or driver values */
601 if (host
->hostt
->bios_param
)
602 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
604 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
606 geo
->heads
= diskinfo
[0];
607 geo
->sectors
= diskinfo
[1];
608 geo
->cylinders
= diskinfo
[2];
613 * sd_ioctl - process an ioctl
614 * @inode: only i_rdev/i_bdev members may be used
615 * @filp: only f_mode and f_flags may be used
616 * @cmd: ioctl command number
617 * @arg: this is third argument given to ioctl(2) system call.
618 * Often contains a pointer.
620 * Returns 0 if successful (some ioctls return postive numbers on
621 * success as well). Returns a negated errno value in case of error.
623 * Note: most ioctls are forward onto the block subsystem or further
624 * down in the scsi subsytem.
626 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
627 unsigned int cmd
, unsigned long arg
)
629 struct block_device
*bdev
= inode
->i_bdev
;
630 struct gendisk
*disk
= bdev
->bd_disk
;
631 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
632 void __user
*p
= (void __user
*)arg
;
635 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
636 disk
->disk_name
, cmd
));
639 * If we are in the middle of error recovery, don't let anyone
640 * else try and use this device. Also, if error recovery fails, it
641 * may try and take the device offline, in which case all further
642 * access to the device is prohibited.
644 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
645 if (!scsi_block_when_processing_errors(sdp
) || !error
)
649 * Send SCSI addressing ioctls directly to mid level, send other
650 * ioctls to block level and then onto mid level if they can't be
654 case SCSI_IOCTL_GET_IDLUN
:
655 case SCSI_IOCTL_GET_BUS_NUMBER
:
656 return scsi_ioctl(sdp
, cmd
, p
);
658 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
659 if (error
!= -ENOTTY
)
662 return scsi_ioctl(sdp
, cmd
, p
);
665 static void set_media_not_present(struct scsi_disk
*sdkp
)
667 sdkp
->media_present
= 0;
669 sdkp
->device
->changed
= 1;
673 * sd_media_changed - check if our medium changed
674 * @disk: kernel device descriptor
676 * Returns 0 if not applicable or no change; 1 if change
678 * Note: this function is invoked from the block subsystem.
680 static int sd_media_changed(struct gendisk
*disk
)
682 struct scsi_disk
*sdkp
= scsi_disk(disk
);
683 struct scsi_device
*sdp
= sdkp
->device
;
686 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
692 * If the device is offline, don't send any commands - just pretend as
693 * if the command failed. If the device ever comes back online, we
694 * can deal with it then. It is only because of unrecoverable errors
695 * that we would ever take a device offline in the first place.
697 if (!scsi_device_online(sdp
))
701 * Using TEST_UNIT_READY enables differentiation between drive with
702 * no cartridge loaded - NOT READY, drive with changed cartridge -
703 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
705 * Drives that auto spin down. eg iomega jaz 1G, will be started
706 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
707 * sd_revalidate() is called.
710 if (scsi_block_when_processing_errors(sdp
))
711 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
714 * Unable to test, unit probably not ready. This usually
715 * means there is no disc in the drive. Mark as changed,
716 * and we will figure it out later once the drive is
723 * For removable scsi disk we have to recognise the presence
724 * of a disk in the drive. This is kept in the struct scsi_disk
725 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
727 sdkp
->media_present
= 1;
729 retval
= sdp
->changed
;
735 set_media_not_present(sdkp
);
739 static int sd_sync_cache(struct scsi_disk
*sdkp
)
742 struct scsi_device
*sdp
= sdkp
->device
;
743 struct scsi_sense_hdr sshdr
;
745 if (!scsi_device_online(sdp
))
749 for (retries
= 3; retries
> 0; --retries
) {
750 unsigned char cmd
[10] = { 0 };
752 cmd
[0] = SYNCHRONIZE_CACHE
;
754 * Leave the rest of the command zero to indicate
757 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
758 SD_TIMEOUT
, SD_MAX_RETRIES
);
764 sd_print_result(sdkp
, res
);
765 if (driver_byte(res
) & DRIVER_SENSE
)
766 sd_print_sense_hdr(sdkp
, &sshdr
);
774 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
777 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
783 ret
= sd_sync_cache(sdkp
);
788 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
790 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
791 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
792 rq
->timeout
= SD_TIMEOUT
;
793 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
797 static void sd_rescan(struct device
*dev
)
799 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
802 sd_revalidate_disk(sdkp
->disk
);
810 * This gets directly called from VFS. When the ioctl
811 * is not recognized we go back to the other translation paths.
813 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
815 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
816 struct gendisk
*disk
= bdev
->bd_disk
;
817 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
820 * If we are in the middle of error recovery, don't let anyone
821 * else try and use this device. Also, if error recovery fails, it
822 * may try and take the device offline, in which case all further
823 * access to the device is prohibited.
825 if (!scsi_block_when_processing_errors(sdev
))
828 if (sdev
->host
->hostt
->compat_ioctl
) {
831 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
837 * Let the static ioctl translation table take care of it.
843 static struct block_device_operations sd_fops
= {
844 .owner
= THIS_MODULE
,
846 .release
= sd_release
,
850 .compat_ioctl
= sd_compat_ioctl
,
852 .media_changed
= sd_media_changed
,
853 .revalidate_disk
= sd_revalidate_disk
,
857 * sd_rw_intr - bottom half handler: called when the lower level
858 * driver has completed (successfully or otherwise) a scsi command.
859 * @SCpnt: mid-level's per command structure.
861 * Note: potentially run from within an ISR. Must not block.
863 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
865 int result
= SCpnt
->result
;
866 unsigned int xfer_size
= SCpnt
->request_bufflen
;
867 unsigned int good_bytes
= result
? 0 : xfer_size
;
868 u64 start_lba
= SCpnt
->request
->sector
;
870 struct scsi_sense_hdr sshdr
;
872 int sense_deferred
= 0;
876 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
878 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
880 #ifdef CONFIG_SCSI_LOGGING
881 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
883 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
884 "sd_rw_intr: sb[respc,sk,asc,"
885 "ascq]=%x,%x,%x,%x\n",
887 sshdr
.sense_key
, sshdr
.asc
,
891 if (driver_byte(result
) != DRIVER_SENSE
&&
892 (!sense_valid
|| sense_deferred
))
895 switch (sshdr
.sense_key
) {
898 if (!blk_fs_request(SCpnt
->request
))
900 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
901 SCSI_SENSE_BUFFERSIZE
,
905 if (xfer_size
<= SCpnt
->device
->sector_size
)
907 switch (SCpnt
->device
->sector_size
) {
923 /* Print something here with limiting frequency. */
927 /* This computation should always be done in terms of
928 * the resolution of the device's medium.
930 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
932 case RECOVERED_ERROR
:
934 /* Inform the user, but make sure that it's not treated
937 scsi_print_sense("sd", SCpnt
);
939 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
940 good_bytes
= xfer_size
;
942 case ILLEGAL_REQUEST
:
943 if (SCpnt
->device
->use_10_for_rw
&&
944 (SCpnt
->cmnd
[0] == READ_10
||
945 SCpnt
->cmnd
[0] == WRITE_10
))
946 SCpnt
->device
->use_10_for_rw
= 0;
947 if (SCpnt
->device
->use_10_for_ms
&&
948 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
949 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
950 SCpnt
->device
->use_10_for_ms
= 0;
956 scsi_io_completion(SCpnt
, good_bytes
);
959 static int media_not_present(struct scsi_disk
*sdkp
,
960 struct scsi_sense_hdr
*sshdr
)
963 if (!scsi_sense_valid(sshdr
))
965 /* not invoked for commands that could return deferred errors */
966 if (sshdr
->sense_key
!= NOT_READY
&&
967 sshdr
->sense_key
!= UNIT_ATTENTION
)
969 if (sshdr
->asc
!= 0x3A) /* medium not present */
972 set_media_not_present(sdkp
);
977 * spinup disk - called only in sd_revalidate_disk()
980 sd_spinup_disk(struct scsi_disk
*sdkp
)
982 unsigned char cmd
[10];
983 unsigned long spintime_expire
= 0;
984 int retries
, spintime
;
985 unsigned int the_result
;
986 struct scsi_sense_hdr sshdr
;
991 /* Spin up drives, as required. Only do this at boot time */
992 /* Spinup needs to be done for module loads too. */
997 cmd
[0] = TEST_UNIT_READY
;
998 memset((void *) &cmd
[1], 0, 9);
1000 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1006 * If the drive has indicated to us that it
1007 * doesn't have any media in it, don't bother
1008 * with any more polling.
1010 if (media_not_present(sdkp
, &sshdr
))
1014 sense_valid
= scsi_sense_valid(&sshdr
);
1016 } while (retries
< 3 &&
1017 (!scsi_status_is_good(the_result
) ||
1018 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1019 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1021 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1022 /* no sense, TUR either succeeded or failed
1023 * with a status error */
1024 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1025 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1026 sd_print_result(sdkp
, the_result
);
1032 * The device does not want the automatic start to be issued.
1034 if (sdkp
->device
->no_start_on_add
) {
1039 * If manual intervention is required, or this is an
1040 * absent USB storage device, a spinup is meaningless.
1043 sshdr
.sense_key
== NOT_READY
&&
1044 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1045 break; /* manual intervention required */
1048 * Issue command to spin up drive when not ready
1050 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1052 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1053 cmd
[0] = START_STOP
;
1054 cmd
[1] = 1; /* Return immediately */
1055 memset((void *) &cmd
[2], 0, 8);
1056 cmd
[4] = 1; /* Start spin cycle */
1057 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1059 SD_TIMEOUT
, SD_MAX_RETRIES
);
1060 spintime_expire
= jiffies
+ 100 * HZ
;
1063 /* Wait 1 second for next try */
1068 * Wait for USB flash devices with slow firmware.
1069 * Yes, this sense key/ASC combination shouldn't
1070 * occur here. It's characteristic of these devices.
1072 } else if (sense_valid
&&
1073 sshdr
.sense_key
== UNIT_ATTENTION
&&
1074 sshdr
.asc
== 0x28) {
1076 spintime_expire
= jiffies
+ 5 * HZ
;
1079 /* Wait 1 second for next try */
1082 /* we don't understand the sense code, so it's
1083 * probably pointless to loop */
1085 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1086 sd_print_sense_hdr(sdkp
, &sshdr
);
1091 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1094 if (scsi_status_is_good(the_result
))
1097 printk("not responding...\n");
1102 * read disk capacity
1105 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1107 unsigned char cmd
[16];
1108 int the_result
, retries
;
1109 int sector_size
= 0;
1111 struct scsi_sense_hdr sshdr
;
1112 int sense_valid
= 0;
1113 struct scsi_device
*sdp
= sdkp
->device
;
1119 memset((void *) cmd
, 0, 16);
1120 cmd
[0] = SERVICE_ACTION_IN
;
1121 cmd
[1] = SAI_READ_CAPACITY_16
;
1123 memset((void *) buffer
, 0, 12);
1125 cmd
[0] = READ_CAPACITY
;
1126 memset((void *) &cmd
[1], 0, 9);
1127 memset((void *) buffer
, 0, 8);
1130 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1131 buffer
, longrc
? 12 : 8, &sshdr
,
1132 SD_TIMEOUT
, SD_MAX_RETRIES
);
1134 if (media_not_present(sdkp
, &sshdr
))
1138 sense_valid
= scsi_sense_valid(&sshdr
);
1141 } while (the_result
&& retries
);
1143 if (the_result
&& !longrc
) {
1144 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1145 sd_print_result(sdkp
, the_result
);
1146 if (driver_byte(the_result
) & DRIVER_SENSE
)
1147 sd_print_sense_hdr(sdkp
, &sshdr
);
1149 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1151 /* Set dirty bit for removable devices if not ready -
1152 * sometimes drives will not report this properly. */
1153 if (sdp
->removable
&&
1154 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1157 /* Either no media are present but the drive didn't tell us,
1158 or they are present but the read capacity command fails */
1159 /* sdkp->media_present = 0; -- not always correct */
1160 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1163 } else if (the_result
&& longrc
) {
1164 /* READ CAPACITY(16) has been failed */
1165 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1166 sd_print_result(sdkp
, the_result
);
1167 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1169 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1174 sector_size
= (buffer
[4] << 24) |
1175 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1176 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1177 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1178 if(sizeof(sdkp
->capacity
) > 4) {
1179 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1180 "Trying to use READ CAPACITY(16).\n");
1184 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1185 "a kernel compiled with support for large "
1186 "block devices.\n");
1190 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1195 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1196 ((u64
)buffer
[1] << 48) |
1197 ((u64
)buffer
[2] << 40) |
1198 ((u64
)buffer
[3] << 32) |
1199 ((sector_t
)buffer
[4] << 24) |
1200 ((sector_t
)buffer
[5] << 16) |
1201 ((sector_t
)buffer
[6] << 8) |
1202 (sector_t
)buffer
[7]);
1204 sector_size
= (buffer
[8] << 24) |
1205 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1208 /* Some devices return the total number of sectors, not the
1209 * highest sector number. Make the necessary adjustment. */
1210 if (sdp
->fix_capacity
) {
1213 /* Some devices have version which report the correct sizes
1214 * and others which do not. We guess size according to a heuristic
1215 * and err on the side of lowering the capacity. */
1217 if (sdp
->guess_capacity
)
1218 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1223 if (sector_size
== 0) {
1225 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1229 if (sector_size
!= 512 &&
1230 sector_size
!= 1024 &&
1231 sector_size
!= 2048 &&
1232 sector_size
!= 4096 &&
1233 sector_size
!= 256) {
1234 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1237 * The user might want to re-format the drive with
1238 * a supported sectorsize. Once this happens, it
1239 * would be relatively trivial to set the thing up.
1240 * For this reason, we leave the thing in the table.
1244 * set a bogus sector size so the normal read/write
1245 * logic in the block layer will eventually refuse any
1246 * request on this device without tripping over power
1247 * of two sector size assumptions
1253 * The msdos fs needs to know the hardware sector size
1254 * So I have created this table. See ll_rw_blk.c
1255 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1257 int hard_sector
= sector_size
;
1258 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1259 request_queue_t
*queue
= sdp
->request_queue
;
1262 blk_queue_hardsect_size(queue
, hard_sector
);
1263 /* avoid 64-bit division on 32-bit platforms */
1264 sector_div(sz
, 625);
1266 sector_div(mb
, 1950);
1268 sd_printk(KERN_NOTICE
, sdkp
,
1269 "%llu %d-byte hardware sectors (%llu MB)\n",
1270 (unsigned long long)sdkp
->capacity
,
1271 hard_sector
, (unsigned long long)mb
);
1274 /* Rescale capacity to 512-byte units */
1275 if (sector_size
== 4096)
1276 sdkp
->capacity
<<= 3;
1277 else if (sector_size
== 2048)
1278 sdkp
->capacity
<<= 2;
1279 else if (sector_size
== 1024)
1280 sdkp
->capacity
<<= 1;
1281 else if (sector_size
== 256)
1282 sdkp
->capacity
>>= 1;
1284 sdkp
->device
->sector_size
= sector_size
;
1287 /* called with buffer of length 512 */
1289 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1290 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1291 struct scsi_sense_hdr
*sshdr
)
1293 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1294 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1299 * read write protect setting, if possible - called only in sd_revalidate_disk()
1300 * called with buffer of length SD_BUF_SIZE
1303 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1306 struct scsi_device
*sdp
= sdkp
->device
;
1307 struct scsi_mode_data data
;
1309 set_disk_ro(sdkp
->disk
, 0);
1310 if (sdp
->skip_ms_page_3f
) {
1311 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1315 if (sdp
->use_192_bytes_for_3f
) {
1316 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1319 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1320 * We have to start carefully: some devices hang if we ask
1321 * for more than is available.
1323 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1326 * Second attempt: ask for page 0 When only page 0 is
1327 * implemented, a request for page 3F may return Sense Key
1328 * 5: Illegal Request, Sense Code 24: Invalid field in
1331 if (!scsi_status_is_good(res
))
1332 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1335 * Third attempt: ask 255 bytes, as we did earlier.
1337 if (!scsi_status_is_good(res
))
1338 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1342 if (!scsi_status_is_good(res
)) {
1343 sd_printk(KERN_WARNING
, sdkp
,
1344 "Test WP failed, assume Write Enabled\n");
1346 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1347 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1348 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1349 sdkp
->write_prot
? "on" : "off");
1350 sd_printk(KERN_DEBUG
, sdkp
,
1351 "Mode Sense: %02x %02x %02x %02x\n",
1352 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1357 * sd_read_cache_type - called only from sd_revalidate_disk()
1358 * called with buffer of length SD_BUF_SIZE
1361 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1364 struct scsi_device
*sdp
= sdkp
->device
;
1368 struct scsi_mode_data data
;
1369 struct scsi_sense_hdr sshdr
;
1371 if (sdp
->skip_ms_page_8
)
1374 if (sdp
->type
== TYPE_RBC
) {
1382 /* cautiously ask */
1383 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1385 if (!scsi_status_is_good(res
))
1388 if (!data
.header_length
) {
1390 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1393 /* that went OK, now ask for the proper length */
1397 * We're only interested in the first three bytes, actually.
1398 * But the data cache page is defined for the first 20.
1405 /* Take headers and block descriptors into account */
1406 len
+= data
.header_length
+ data
.block_descriptor_length
;
1407 if (len
> SD_BUF_SIZE
)
1411 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1413 if (scsi_status_is_good(res
)) {
1414 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1416 if (offset
>= SD_BUF_SIZE
- 2) {
1417 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1421 if ((buffer
[offset
] & 0x3f) != modepage
) {
1422 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1426 if (modepage
== 8) {
1427 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1428 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1430 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1434 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1435 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1436 sd_printk(KERN_NOTICE
, sdkp
,
1437 "Uses READ/WRITE(6), disabling FUA\n");
1441 sd_printk(KERN_NOTICE
, sdkp
,
1442 "Write cache: %s, read cache: %s, %s\n",
1443 sdkp
->WCE
? "enabled" : "disabled",
1444 sdkp
->RCD
? "disabled" : "enabled",
1445 sdkp
->DPOFUA
? "supports DPO and FUA"
1446 : "doesn't support DPO or FUA");
1452 if (scsi_sense_valid(&sshdr
) &&
1453 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1454 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1455 /* Invalid field in CDB */
1456 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1458 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1461 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1468 * sd_revalidate_disk - called the first time a new disk is seen,
1469 * performs disk spin up, read_capacity, etc.
1470 * @disk: struct gendisk we care about
1472 static int sd_revalidate_disk(struct gendisk
*disk
)
1474 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1475 struct scsi_device
*sdp
= sdkp
->device
;
1476 unsigned char *buffer
;
1479 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1480 "sd_revalidate_disk\n"));
1483 * If the device is offline, don't try and read capacity or any
1484 * of the other niceties.
1486 if (!scsi_device_online(sdp
))
1489 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
| __GFP_DMA
);
1491 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1492 "allocation failure.\n");
1496 /* defaults, until the device tells us otherwise */
1497 sdp
->sector_size
= 512;
1499 sdkp
->media_present
= 1;
1500 sdkp
->write_prot
= 0;
1504 sd_spinup_disk(sdkp
);
1507 * Without media there is no reason to ask; moreover, some devices
1508 * react badly if we do.
1510 if (sdkp
->media_present
) {
1511 sd_read_capacity(sdkp
, buffer
);
1512 sd_read_write_protect_flag(sdkp
, buffer
);
1513 sd_read_cache_type(sdkp
, buffer
);
1517 * We now have all cache related info, determine how we deal
1518 * with ordered requests. Note that as the current SCSI
1519 * dispatch function can alter request order, we cannot use
1520 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1523 ordered
= sdkp
->DPOFUA
1524 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1526 ordered
= QUEUE_ORDERED_DRAIN
;
1528 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1530 set_capacity(disk
, sdkp
->capacity
);
1538 * sd_probe - called during driver initialization and whenever a
1539 * new scsi device is attached to the system. It is called once
1540 * for each scsi device (not just disks) present.
1541 * @dev: pointer to device object
1543 * Returns 0 if successful (or not interested in this scsi device
1544 * (e.g. scanner)); 1 when there is an error.
1546 * Note: this function is invoked from the scsi mid-level.
1547 * This function sets up the mapping between a given
1548 * <host,channel,id,lun> (found in sdp) and new device name
1549 * (e.g. /dev/sda). More precisely it is the block device major
1550 * and minor number that is chosen here.
1552 * Assume sd_attach is not re-entrant (for time being)
1553 * Also think about sd_attach() and sd_remove() running coincidentally.
1555 static int sd_probe(struct device
*dev
)
1557 struct scsi_device
*sdp
= to_scsi_device(dev
);
1558 struct scsi_disk
*sdkp
;
1564 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1567 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1571 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1575 gd
= alloc_disk(16);
1579 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1582 spin_lock(&sd_index_lock
);
1583 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1584 spin_unlock(&sd_index_lock
);
1586 if (index
>= SD_MAX_DISKS
)
1592 sdkp
->driver
= &sd_template
;
1594 sdkp
->index
= index
;
1597 if (!sdp
->timeout
) {
1598 if (sdp
->type
!= TYPE_MOD
)
1599 sdp
->timeout
= SD_TIMEOUT
;
1601 sdp
->timeout
= SD_MOD_TIMEOUT
;
1604 class_device_initialize(&sdkp
->cdev
);
1605 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1606 sdkp
->cdev
.class = &sd_disk_class
;
1607 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1609 if (class_device_add(&sdkp
->cdev
))
1612 get_device(&sdp
->sdev_gendev
);
1614 gd
->major
= sd_major((index
& 0xf0) >> 4);
1615 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1617 gd
->fops
= &sd_fops
;
1620 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1621 } else if (index
< (26 + 1) * 26) {
1622 sprintf(gd
->disk_name
, "sd%c%c",
1623 'a' + index
/ 26 - 1,'a' + index
% 26);
1625 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1626 const unsigned int m2
= (index
/ 26 - 1) % 26;
1627 const unsigned int m3
= index
% 26;
1628 sprintf(gd
->disk_name
, "sd%c%c%c",
1629 'a' + m1
, 'a' + m2
, 'a' + m3
);
1632 gd
->private_data
= &sdkp
->driver
;
1633 gd
->queue
= sdkp
->device
->request_queue
;
1635 sd_revalidate_disk(gd
);
1637 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1638 gd
->flags
= GENHD_FL_DRIVERFS
;
1640 gd
->flags
|= GENHD_FL_REMOVABLE
;
1642 dev_set_drvdata(dev
, sdkp
);
1645 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1646 sdp
->removable
? "removable " : "");
1659 * sd_remove - called whenever a scsi disk (previously recognized by
1660 * sd_probe) is detached from the system. It is called (potentially
1661 * multiple times) during sd module unload.
1662 * @sdp: pointer to mid level scsi device object
1664 * Note: this function is invoked from the scsi mid-level.
1665 * This function potentially frees up a device name (e.g. /dev/sdc)
1666 * that could be re-used by a subsequent sd_probe().
1667 * This function is not called when the built-in sd driver is "exit-ed".
1669 static int sd_remove(struct device
*dev
)
1671 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1673 class_device_del(&sdkp
->cdev
);
1674 del_gendisk(sdkp
->disk
);
1677 mutex_lock(&sd_ref_mutex
);
1678 dev_set_drvdata(dev
, NULL
);
1679 class_device_put(&sdkp
->cdev
);
1680 mutex_unlock(&sd_ref_mutex
);
1686 * scsi_disk_release - Called to free the scsi_disk structure
1687 * @cdev: pointer to embedded class device
1689 * sd_ref_mutex must be held entering this routine. Because it is
1690 * called on last put, you should always use the scsi_disk_get()
1691 * scsi_disk_put() helpers which manipulate the semaphore directly
1692 * and never do a direct class_device_put().
1694 static void scsi_disk_release(struct class_device
*cdev
)
1696 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1697 struct gendisk
*disk
= sdkp
->disk
;
1699 spin_lock(&sd_index_lock
);
1700 idr_remove(&sd_index_idr
, sdkp
->index
);
1701 spin_unlock(&sd_index_lock
);
1703 disk
->private_data
= NULL
;
1705 put_device(&sdkp
->device
->sdev_gendev
);
1711 * Send a SYNCHRONIZE CACHE instruction down to the device through
1712 * the normal SCSI command structure. Wait for the command to
1715 static void sd_shutdown(struct device
*dev
)
1717 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1720 return; /* this can happen */
1723 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1724 sd_sync_cache(sdkp
);
1726 scsi_disk_put(sdkp
);
1730 * init_sd - entry point for this driver (both when built in or when
1733 * Note: this function registers this driver with the scsi mid-level.
1735 static int __init
init_sd(void)
1737 int majors
= 0, i
, err
;
1739 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1741 for (i
= 0; i
< SD_MAJORS
; i
++)
1742 if (register_blkdev(sd_major(i
), "sd") == 0)
1748 err
= class_register(&sd_disk_class
);
1752 err
= scsi_register_driver(&sd_template
.gendrv
);
1759 class_unregister(&sd_disk_class
);
1761 for (i
= 0; i
< SD_MAJORS
; i
++)
1762 unregister_blkdev(sd_major(i
), "sd");
1767 * exit_sd - exit point for this driver (when it is a module).
1769 * Note: this function unregisters this driver from the scsi mid-level.
1771 static void __exit
exit_sd(void)
1775 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1777 scsi_unregister_driver(&sd_template
.gendrv
);
1778 class_unregister(&sd_disk_class
);
1780 for (i
= 0; i
< SD_MAJORS
; i
++)
1781 unregister_blkdev(sd_major(i
), "sd");
1784 module_init(init_sd
);
1785 module_exit(exit_sd
);
1787 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1788 struct scsi_sense_hdr
*sshdr
)
1790 sd_printk(KERN_INFO
, sdkp
, "");
1791 scsi_show_sense_hdr(sshdr
);
1792 sd_printk(KERN_INFO
, sdkp
, "");
1793 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1796 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1798 sd_printk(KERN_INFO
, sdkp
, "");
1799 scsi_show_result(result
);