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>
38 #include <linux/sched.h>
40 #include <linux/bio.h>
41 #include <linux/genhd.h>
42 #include <linux/hdreg.h>
43 #include <linux/errno.h>
44 #include <linux/idr.h>
45 #include <linux/interrupt.h>
46 #include <linux/init.h>
47 #include <linux/blkdev.h>
48 #include <linux/blkpg.h>
49 #include <linux/delay.h>
50 #include <linux/mutex.h>
51 #include <asm/uaccess.h>
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_eh.h>
59 #include <scsi/scsi_host.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
66 * More than enough for everybody ;) The huge number of majors
67 * is a leftover from 16bit dev_t days, we don't really need that
72 MODULE_AUTHOR("Eric Youngdale");
73 MODULE_DESCRIPTION("SCSI disk (sd) driver");
74 MODULE_LICENSE("GPL");
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
94 * This is limited by the naming scheme enforced in sd_probe,
95 * add another character to it if you really need more disks.
97 #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
100 * Time out in seconds for disks and Magneto-opticals (which are slower).
102 #define SD_TIMEOUT (30 * HZ)
103 #define SD_MOD_TIMEOUT (75 * HZ)
106 * Number of allowed retries
108 #define SD_MAX_RETRIES 5
109 #define SD_PASSTHROUGH_RETRIES 1
112 * Size of the initial data buffer for mode and read capacity data
114 #define SD_BUF_SIZE 512
117 struct scsi_driver
*driver
; /* always &sd_template */
118 struct scsi_device
*device
;
119 struct class_device cdev
;
120 struct gendisk
*disk
;
121 unsigned int openers
; /* protected by BKL for now, yuck */
122 sector_t capacity
; /* size in 512-byte sectors */
126 unsigned WCE
: 1; /* state of disk WCE bit */
127 unsigned RCD
: 1; /* state of disk RCD bit, unused */
128 unsigned DPOFUA
: 1; /* state of disk DPOFUA bit */
130 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
132 static DEFINE_IDR(sd_index_idr
);
133 static DEFINE_SPINLOCK(sd_index_lock
);
135 /* This semaphore is used to mediate the 0->1 reference get in the
136 * face of object destruction (i.e. we can't allow a get on an
137 * object after last put) */
138 static DEFINE_MUTEX(sd_ref_mutex
);
140 static int sd_revalidate_disk(struct gendisk
*disk
);
141 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
);
143 static int sd_probe(struct device
*);
144 static int sd_remove(struct device
*);
145 static void sd_shutdown(struct device
*dev
);
146 static void sd_rescan(struct device
*);
147 static int sd_init_command(struct scsi_cmnd
*);
148 static int sd_issue_flush(struct device
*, sector_t
*);
149 static void sd_prepare_flush(request_queue_t
*, struct request
*);
150 static void sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
151 unsigned char *buffer
);
152 static void scsi_disk_release(struct class_device
*cdev
);
154 static const char *sd_cache_types
[] = {
155 "write through", "none", "write back",
156 "write back, no read (daft)"
159 static ssize_t
sd_store_cache_type(struct class_device
*cdev
, const char *buf
,
162 int i
, ct
= -1, rcd
, wce
, sp
;
163 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
164 struct scsi_device
*sdp
= sdkp
->device
;
167 struct scsi_mode_data data
;
168 struct scsi_sense_hdr sshdr
;
171 if (sdp
->type
!= TYPE_DISK
)
172 /* no cache control on RBC devices; theoretically they
173 * can do it, but there's probably so many exceptions
174 * it's not worth the risk */
177 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
178 const int len
= strlen(sd_cache_types
[i
]);
179 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
187 rcd
= ct
& 0x01 ? 1 : 0;
188 wce
= ct
& 0x02 ? 1 : 0;
189 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
190 SD_MAX_RETRIES
, &data
, NULL
))
192 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
193 data
.block_descriptor_length
);
194 buffer_data
= buffer
+ data
.header_length
+
195 data
.block_descriptor_length
;
196 buffer_data
[2] &= ~0x05;
197 buffer_data
[2] |= wce
<< 2 | rcd
;
198 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
200 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
201 SD_MAX_RETRIES
, &data
, &sshdr
)) {
202 if (scsi_sense_valid(&sshdr
))
203 scsi_print_sense_hdr(sdkp
->disk
->disk_name
, &sshdr
);
206 sd_revalidate_disk(sdkp
->disk
);
210 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
212 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
213 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
215 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
218 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
220 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
222 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
225 static struct class_device_attribute sd_disk_attrs
[] = {
226 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
227 sd_store_cache_type
),
228 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
232 static struct class sd_disk_class
= {
234 .owner
= THIS_MODULE
,
235 .release
= scsi_disk_release
,
236 .class_dev_attrs
= sd_disk_attrs
,
239 static struct scsi_driver sd_template
= {
240 .owner
= THIS_MODULE
,
245 .shutdown
= sd_shutdown
,
248 .init_command
= sd_init_command
,
249 .issue_flush
= sd_issue_flush
,
253 * Device no to disk mapping:
255 * major disc2 disc p1
256 * |............|.............|....|....| <- dev_t
259 * Inside a major, we have 16k disks, however mapped non-
260 * contiguously. The first 16 disks are for major0, the next
261 * ones with major1, ... Disk 256 is for major0 again, disk 272
263 * As we stay compatible with our numbering scheme, we can reuse
264 * the well-know SCSI majors 8, 65--71, 136--143.
266 static int sd_major(int major_idx
)
270 return SCSI_DISK0_MAJOR
;
272 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
274 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
277 return 0; /* shut up gcc */
281 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
283 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
286 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
288 struct scsi_disk
*sdkp
= NULL
;
290 if (disk
->private_data
) {
291 sdkp
= scsi_disk(disk
);
292 if (scsi_device_get(sdkp
->device
) == 0)
293 class_device_get(&sdkp
->cdev
);
300 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
302 struct scsi_disk
*sdkp
;
304 mutex_lock(&sd_ref_mutex
);
305 sdkp
= __scsi_disk_get(disk
);
306 mutex_unlock(&sd_ref_mutex
);
310 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
312 struct scsi_disk
*sdkp
;
314 mutex_lock(&sd_ref_mutex
);
315 sdkp
= dev_get_drvdata(dev
);
317 sdkp
= __scsi_disk_get(sdkp
->disk
);
318 mutex_unlock(&sd_ref_mutex
);
322 static void scsi_disk_put(struct scsi_disk
*sdkp
)
324 struct scsi_device
*sdev
= sdkp
->device
;
326 mutex_lock(&sd_ref_mutex
);
327 class_device_put(&sdkp
->cdev
);
328 scsi_device_put(sdev
);
329 mutex_unlock(&sd_ref_mutex
);
333 * sd_init_command - build a scsi (read or write) command from
334 * information in the request structure.
335 * @SCpnt: pointer to mid-level's per scsi command structure that
336 * contains request and into which the scsi command is written
338 * Returns 1 if successful and 0 if error (or cannot be done now).
340 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
342 struct scsi_device
*sdp
= SCpnt
->device
;
343 struct request
*rq
= SCpnt
->request
;
344 struct gendisk
*disk
= rq
->rq_disk
;
345 sector_t block
= rq
->sector
;
346 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
347 unsigned int timeout
= sdp
->timeout
;
349 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
350 "count=%d\n", disk
->disk_name
,
351 (unsigned long long)block
, this_count
));
353 if (!sdp
|| !scsi_device_online(sdp
) ||
354 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
355 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
357 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
363 * quietly refuse to do anything to a changed disc until
364 * the changed bit has been reset
366 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
369 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
370 disk
->disk_name
, (unsigned long long)block
));
373 * If we have a 1K hardware sectorsize, prevent access to single
374 * 512 byte sectors. In theory we could handle this - in fact
375 * the scsi cdrom driver must be able to handle this because
376 * we typically use 1K blocksizes, and cdroms typically have
377 * 2K hardware sectorsizes. Of course, things are simpler
378 * with the cdrom, since it is read-only. For performance
379 * reasons, the filesystems should be able to handle this
380 * and not force the scsi disk driver to use bounce buffers
383 if (sdp
->sector_size
== 1024) {
384 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
385 printk(KERN_ERR
"sd: Bad block number requested");
389 this_count
= this_count
>> 1;
392 if (sdp
->sector_size
== 2048) {
393 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
394 printk(KERN_ERR
"sd: Bad block number requested");
398 this_count
= this_count
>> 2;
401 if (sdp
->sector_size
== 4096) {
402 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
403 printk(KERN_ERR
"sd: Bad block number requested");
407 this_count
= this_count
>> 3;
410 if (rq_data_dir(rq
) == WRITE
) {
411 if (!sdp
->writeable
) {
414 SCpnt
->cmnd
[0] = WRITE_6
;
415 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
416 } else if (rq_data_dir(rq
) == READ
) {
417 SCpnt
->cmnd
[0] = READ_6
;
418 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
420 printk(KERN_ERR
"sd: Unknown command %lx\n", rq
->flags
);
421 /* overkill panic("Unknown sd command %lx\n", rq->flags); */
425 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
426 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
427 "writing" : "reading", this_count
, rq
->nr_sectors
));
431 if (block
> 0xffffffff) {
432 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
433 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
434 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
435 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
436 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
437 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
438 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
439 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
440 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
441 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
442 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
443 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
444 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
445 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
446 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
447 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
448 SCpnt
->device
->use_10_for_rw
) {
449 if (this_count
> 0xffff)
452 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
453 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
454 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
455 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
456 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
457 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
458 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
459 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
460 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
462 if (unlikely(blk_fua_rq(rq
))) {
464 * This happens only if this drive failed
465 * 10byte rw command with ILLEGAL_REQUEST
466 * during operation and thus turned off
469 printk(KERN_ERR
"sd: FUA write on READ/WRITE(6) drive\n");
473 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
474 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
475 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
476 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
479 SCpnt
->request_bufflen
= SCpnt
->bufflen
=
480 this_count
* sdp
->sector_size
;
483 * We shouldn't disconnect in the middle of a sector, so with a dumb
484 * host adapter, it's safe to assume that we can at least transfer
485 * this many bytes between each connect / disconnect.
487 SCpnt
->transfersize
= sdp
->sector_size
;
488 SCpnt
->underflow
= this_count
<< 9;
489 SCpnt
->allowed
= SD_MAX_RETRIES
;
490 SCpnt
->timeout_per_command
= timeout
;
493 * This is the completion routine we use. This is matched in terms
494 * of capability to this function.
496 SCpnt
->done
= sd_rw_intr
;
499 * This indicates that the command is ready from our end to be
506 * sd_open - open a scsi disk device
507 * @inode: only i_rdev member may be used
508 * @filp: only f_mode and f_flags may be used
510 * Returns 0 if successful. Returns a negated errno value in case
513 * Note: This can be called from a user context (e.g. fsck(1) )
514 * or from within the kernel (e.g. as a result of a mount(1) ).
515 * In the latter case @inode and @filp carry an abridged amount
516 * of information as noted above.
518 static int sd_open(struct inode
*inode
, struct file
*filp
)
520 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
521 struct scsi_disk
*sdkp
;
522 struct scsi_device
*sdev
;
525 if (!(sdkp
= scsi_disk_get(disk
)))
529 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
534 * If the device is in error recovery, wait until it is done.
535 * If the device is offline, then disallow any access to it.
538 if (!scsi_block_when_processing_errors(sdev
))
541 if (sdev
->removable
|| sdkp
->write_prot
)
542 check_disk_change(inode
->i_bdev
);
545 * If the drive is empty, just let the open fail.
548 if (sdev
->removable
&& !sdkp
->media_present
&&
549 !(filp
->f_flags
& O_NDELAY
))
553 * If the device has the write protect tab set, have the open fail
554 * if the user expects to be able to write to the thing.
557 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
561 * It is possible that the disk changing stuff resulted in
562 * the device being taken offline. If this is the case,
563 * report this to the user, and don't pretend that the
564 * open actually succeeded.
567 if (!scsi_device_online(sdev
))
570 if (!sdkp
->openers
++ && sdev
->removable
) {
571 if (scsi_block_when_processing_errors(sdev
))
572 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
583 * sd_release - invoked when the (last) close(2) is called on this
585 * @inode: only i_rdev member may be used
586 * @filp: only f_mode and f_flags may be used
590 * Note: may block (uninterruptible) if error recovery is underway
593 static int sd_release(struct inode
*inode
, struct file
*filp
)
595 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
596 struct scsi_disk
*sdkp
= scsi_disk(disk
);
597 struct scsi_device
*sdev
= sdkp
->device
;
599 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
601 if (!--sdkp
->openers
&& sdev
->removable
) {
602 if (scsi_block_when_processing_errors(sdev
))
603 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
607 * XXX and what if there are packets in flight and this close()
608 * XXX is followed by a "rmmod sd_mod"?
614 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
616 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
617 struct scsi_device
*sdp
= sdkp
->device
;
618 struct Scsi_Host
*host
= sdp
->host
;
621 /* default to most commonly used values */
622 diskinfo
[0] = 0x40; /* 1 << 6 */
623 diskinfo
[1] = 0x20; /* 1 << 5 */
624 diskinfo
[2] = sdkp
->capacity
>> 11;
626 /* override with calculated, extended default, or driver values */
627 if (host
->hostt
->bios_param
)
628 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
630 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
632 geo
->heads
= diskinfo
[0];
633 geo
->sectors
= diskinfo
[1];
634 geo
->cylinders
= diskinfo
[2];
639 * sd_ioctl - process an ioctl
640 * @inode: only i_rdev/i_bdev members may be used
641 * @filp: only f_mode and f_flags may be used
642 * @cmd: ioctl command number
643 * @arg: this is third argument given to ioctl(2) system call.
644 * Often contains a pointer.
646 * Returns 0 if successful (some ioctls return postive numbers on
647 * success as well). Returns a negated errno value in case of error.
649 * Note: most ioctls are forward onto the block subsystem or further
650 * down in the scsi subsytem.
652 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
653 unsigned int cmd
, unsigned long arg
)
655 struct block_device
*bdev
= inode
->i_bdev
;
656 struct gendisk
*disk
= bdev
->bd_disk
;
657 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
658 void __user
*p
= (void __user
*)arg
;
661 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
662 disk
->disk_name
, cmd
));
665 * If we are in the middle of error recovery, don't let anyone
666 * else try and use this device. Also, if error recovery fails, it
667 * may try and take the device offline, in which case all further
668 * access to the device is prohibited.
670 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
671 if (!scsi_block_when_processing_errors(sdp
) || !error
)
675 * Send SCSI addressing ioctls directly to mid level, send other
676 * ioctls to block level and then onto mid level if they can't be
680 case SCSI_IOCTL_GET_IDLUN
:
681 case SCSI_IOCTL_GET_BUS_NUMBER
:
682 return scsi_ioctl(sdp
, cmd
, p
);
684 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
685 if (error
!= -ENOTTY
)
688 return scsi_ioctl(sdp
, cmd
, p
);
691 static void set_media_not_present(struct scsi_disk
*sdkp
)
693 sdkp
->media_present
= 0;
695 sdkp
->device
->changed
= 1;
699 * sd_media_changed - check if our medium changed
700 * @disk: kernel device descriptor
702 * Returns 0 if not applicable or no change; 1 if change
704 * Note: this function is invoked from the block subsystem.
706 static int sd_media_changed(struct gendisk
*disk
)
708 struct scsi_disk
*sdkp
= scsi_disk(disk
);
709 struct scsi_device
*sdp
= sdkp
->device
;
712 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
719 * If the device is offline, don't send any commands - just pretend as
720 * if the command failed. If the device ever comes back online, we
721 * can deal with it then. It is only because of unrecoverable errors
722 * that we would ever take a device offline in the first place.
724 if (!scsi_device_online(sdp
))
728 * Using TEST_UNIT_READY enables differentiation between drive with
729 * no cartridge loaded - NOT READY, drive with changed cartridge -
730 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
732 * Drives that auto spin down. eg iomega jaz 1G, will be started
733 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
734 * sd_revalidate() is called.
737 if (scsi_block_when_processing_errors(sdp
))
738 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
741 * Unable to test, unit probably not ready. This usually
742 * means there is no disc in the drive. Mark as changed,
743 * and we will figure it out later once the drive is
750 * For removable scsi disk we have to recognise the presence
751 * of a disk in the drive. This is kept in the struct scsi_disk
752 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
754 sdkp
->media_present
= 1;
756 retval
= sdp
->changed
;
762 set_media_not_present(sdkp
);
766 static int sd_sync_cache(struct scsi_device
*sdp
)
769 struct scsi_sense_hdr sshdr
;
771 if (!scsi_device_online(sdp
))
775 for (retries
= 3; retries
> 0; --retries
) {
776 unsigned char cmd
[10] = { 0 };
778 cmd
[0] = SYNCHRONIZE_CACHE
;
780 * Leave the rest of the command zero to indicate
783 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
784 SD_TIMEOUT
, SD_MAX_RETRIES
);
789 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
790 "host = %d, driver = %02x\n ",
791 status_byte(res
), msg_byte(res
),
792 host_byte(res
), driver_byte(res
));
793 if (driver_byte(res
) & DRIVER_SENSE
)
794 scsi_print_sense_hdr("sd", &sshdr
);
800 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
803 struct scsi_device
*sdp
= to_scsi_device(dev
);
804 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
810 ret
= sd_sync_cache(sdp
);
815 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
817 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
818 rq
->flags
|= REQ_BLOCK_PC
;
819 rq
->timeout
= SD_TIMEOUT
;
820 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
824 static void sd_rescan(struct device
*dev
)
826 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
829 sd_revalidate_disk(sdkp
->disk
);
837 * This gets directly called from VFS. When the ioctl
838 * is not recognized we go back to the other translation paths.
840 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
842 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
843 struct gendisk
*disk
= bdev
->bd_disk
;
844 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
847 * If we are in the middle of error recovery, don't let anyone
848 * else try and use this device. Also, if error recovery fails, it
849 * may try and take the device offline, in which case all further
850 * access to the device is prohibited.
852 if (!scsi_block_when_processing_errors(sdev
))
855 if (sdev
->host
->hostt
->compat_ioctl
) {
858 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
864 * Let the static ioctl translation table take care of it.
870 static struct block_device_operations sd_fops
= {
871 .owner
= THIS_MODULE
,
873 .release
= sd_release
,
877 .compat_ioctl
= sd_compat_ioctl
,
879 .media_changed
= sd_media_changed
,
880 .revalidate_disk
= sd_revalidate_disk
,
884 * sd_rw_intr - bottom half handler: called when the lower level
885 * driver has completed (successfully or otherwise) a scsi command.
886 * @SCpnt: mid-level's per command structure.
888 * Note: potentially run from within an ISR. Must not block.
890 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
892 int result
= SCpnt
->result
;
893 int this_count
= SCpnt
->request_bufflen
;
894 int good_bytes
= (result
== 0 ? this_count
: 0);
895 sector_t block_sectors
= 1;
897 sector_t error_sector
;
898 struct scsi_sense_hdr sshdr
;
900 int sense_deferred
= 0;
904 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
906 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
909 #ifdef CONFIG_SCSI_LOGGING
910 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
911 SCpnt
->request
->rq_disk
->disk_name
, result
));
913 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
914 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
915 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
919 Handle MEDIUM ERRORs that indicate partial success. Since this is a
920 relatively rare error condition, no care is taken to avoid
921 unnecessary additional work such as memcpy's that could be avoided.
923 if (driver_byte(result
) != 0 &&
924 sense_valid
&& !sense_deferred
) {
925 switch (sshdr
.sense_key
) {
927 if (!blk_fs_request(SCpnt
->request
))
929 info_valid
= scsi_get_sense_info_fld(
930 SCpnt
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
933 * May want to warn and skip if following cast results
934 * in actual truncation (if sector_t < 64 bits)
936 error_sector
= (sector_t
)first_err_block
;
937 if (SCpnt
->request
->bio
!= NULL
)
938 block_sectors
= bio_sectors(SCpnt
->request
->bio
);
939 switch (SCpnt
->device
->sector_size
) {
942 if (block_sectors
< 2)
947 if (block_sectors
< 4)
952 if (block_sectors
< 8)
962 error_sector
&= ~(block_sectors
- 1);
963 good_bytes
= (error_sector
- SCpnt
->request
->sector
) << 9;
964 if (good_bytes
< 0 || good_bytes
>= this_count
)
968 case RECOVERED_ERROR
: /* an error occurred, but it recovered */
969 case NO_SENSE
: /* LLDD got sense data */
971 * Inform the user, but make sure that it's not treated
974 scsi_print_sense("sd", SCpnt
);
976 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
977 good_bytes
= this_count
;
980 case ILLEGAL_REQUEST
:
981 if (SCpnt
->device
->use_10_for_rw
&&
982 (SCpnt
->cmnd
[0] == READ_10
||
983 SCpnt
->cmnd
[0] == WRITE_10
))
984 SCpnt
->device
->use_10_for_rw
= 0;
985 if (SCpnt
->device
->use_10_for_ms
&&
986 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
987 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
988 SCpnt
->device
->use_10_for_ms
= 0;
996 * This calls the generic completion function, now that we know
997 * how many actual sectors finished, and how many sectors we need
998 * to say have failed.
1000 scsi_io_completion(SCpnt
, good_bytes
, block_sectors
<< 9);
1003 static int media_not_present(struct scsi_disk
*sdkp
,
1004 struct scsi_sense_hdr
*sshdr
)
1007 if (!scsi_sense_valid(sshdr
))
1009 /* not invoked for commands that could return deferred errors */
1010 if (sshdr
->sense_key
!= NOT_READY
&&
1011 sshdr
->sense_key
!= UNIT_ATTENTION
)
1013 if (sshdr
->asc
!= 0x3A) /* medium not present */
1016 set_media_not_present(sdkp
);
1021 * spinup disk - called only in sd_revalidate_disk()
1024 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
1026 unsigned char cmd
[10];
1027 unsigned long spintime_expire
= 0;
1028 int retries
, spintime
;
1029 unsigned int the_result
;
1030 struct scsi_sense_hdr sshdr
;
1031 int sense_valid
= 0;
1035 /* Spin up drives, as required. Only do this at boot time */
1036 /* Spinup needs to be done for module loads too. */
1041 cmd
[0] = TEST_UNIT_READY
;
1042 memset((void *) &cmd
[1], 0, 9);
1044 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1050 sense_valid
= scsi_sense_valid(&sshdr
);
1052 } while (retries
< 3 &&
1053 (!scsi_status_is_good(the_result
) ||
1054 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1055 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1058 * If the drive has indicated to us that it doesn't have
1059 * any media in it, don't bother with any of the rest of
1062 if (media_not_present(sdkp
, &sshdr
))
1065 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1066 /* no sense, TUR either succeeded or failed
1067 * with a status error */
1068 if(!spintime
&& !scsi_status_is_good(the_result
))
1069 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1070 "error = 0x%x\n", diskname
, the_result
);
1075 * The device does not want the automatic start to be issued.
1077 if (sdkp
->device
->no_start_on_add
) {
1082 * If manual intervention is required, or this is an
1083 * absent USB storage device, a spinup is meaningless.
1086 sshdr
.sense_key
== NOT_READY
&&
1087 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1088 break; /* manual intervention required */
1091 * Issue command to spin up drive when not ready
1093 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1095 printk(KERN_NOTICE
"%s: Spinning up disk...",
1097 cmd
[0] = START_STOP
;
1098 cmd
[1] = 1; /* Return immediately */
1099 memset((void *) &cmd
[2], 0, 8);
1100 cmd
[4] = 1; /* Start spin cycle */
1101 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1103 SD_TIMEOUT
, SD_MAX_RETRIES
);
1104 spintime_expire
= jiffies
+ 100 * HZ
;
1107 /* Wait 1 second for next try */
1112 * Wait for USB flash devices with slow firmware.
1113 * Yes, this sense key/ASC combination shouldn't
1114 * occur here. It's characteristic of these devices.
1116 } else if (sense_valid
&&
1117 sshdr
.sense_key
== UNIT_ATTENTION
&&
1118 sshdr
.asc
== 0x28) {
1120 spintime_expire
= jiffies
+ 5 * HZ
;
1123 /* Wait 1 second for next try */
1126 /* we don't understand the sense code, so it's
1127 * probably pointless to loop */
1129 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1130 "sense:\n", diskname
);
1131 scsi_print_sense_hdr("", &sshdr
);
1136 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1139 if (scsi_status_is_good(the_result
))
1142 printk("not responding...\n");
1147 * read disk capacity
1150 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1151 unsigned char *buffer
)
1153 unsigned char cmd
[16];
1154 int the_result
, retries
;
1155 int sector_size
= 0;
1157 struct scsi_sense_hdr sshdr
;
1158 int sense_valid
= 0;
1159 struct scsi_device
*sdp
= sdkp
->device
;
1165 memset((void *) cmd
, 0, 16);
1166 cmd
[0] = SERVICE_ACTION_IN
;
1167 cmd
[1] = SAI_READ_CAPACITY_16
;
1169 memset((void *) buffer
, 0, 12);
1171 cmd
[0] = READ_CAPACITY
;
1172 memset((void *) &cmd
[1], 0, 9);
1173 memset((void *) buffer
, 0, 8);
1176 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1177 buffer
, longrc
? 12 : 8, &sshdr
,
1178 SD_TIMEOUT
, SD_MAX_RETRIES
);
1180 if (media_not_present(sdkp
, &sshdr
))
1184 sense_valid
= scsi_sense_valid(&sshdr
);
1187 } while (the_result
&& retries
);
1189 if (the_result
&& !longrc
) {
1190 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1191 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1193 status_byte(the_result
),
1194 msg_byte(the_result
),
1195 host_byte(the_result
),
1196 driver_byte(the_result
));
1198 if (driver_byte(the_result
) & DRIVER_SENSE
)
1199 scsi_print_sense_hdr("sd", &sshdr
);
1201 printk("%s : sense not available. \n", diskname
);
1203 /* Set dirty bit for removable devices if not ready -
1204 * sometimes drives will not report this properly. */
1205 if (sdp
->removable
&&
1206 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1209 /* Either no media are present but the drive didn't tell us,
1210 or they are present but the read capacity command fails */
1211 /* sdkp->media_present = 0; -- not always correct */
1212 sdkp
->capacity
= 0x200000; /* 1 GB - random */
1215 } else if (the_result
&& longrc
) {
1216 /* READ CAPACITY(16) has been failed */
1217 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1218 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1220 status_byte(the_result
),
1221 msg_byte(the_result
),
1222 host_byte(the_result
),
1223 driver_byte(the_result
));
1224 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1227 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1232 sector_size
= (buffer
[4] << 24) |
1233 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1234 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1235 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1236 if(sizeof(sdkp
->capacity
) > 4) {
1237 printk(KERN_NOTICE
"%s : very big device. try to use"
1238 " READ CAPACITY(16).\n", diskname
);
1242 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1243 "kernel compiled with support for large block "
1244 "devices.\n", diskname
);
1248 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1253 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1254 ((u64
)buffer
[1] << 48) |
1255 ((u64
)buffer
[2] << 40) |
1256 ((u64
)buffer
[3] << 32) |
1257 ((sector_t
)buffer
[4] << 24) |
1258 ((sector_t
)buffer
[5] << 16) |
1259 ((sector_t
)buffer
[6] << 8) |
1260 (sector_t
)buffer
[7]);
1262 sector_size
= (buffer
[8] << 24) |
1263 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1266 /* Some devices return the total number of sectors, not the
1267 * highest sector number. Make the necessary adjustment. */
1268 if (sdp
->fix_capacity
)
1272 if (sector_size
== 0) {
1274 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1275 "assuming 512.\n", diskname
);
1278 if (sector_size
!= 512 &&
1279 sector_size
!= 1024 &&
1280 sector_size
!= 2048 &&
1281 sector_size
!= 4096 &&
1282 sector_size
!= 256) {
1283 printk(KERN_NOTICE
"%s : unsupported sector size "
1284 "%d.\n", diskname
, sector_size
);
1286 * The user might want to re-format the drive with
1287 * a supported sectorsize. Once this happens, it
1288 * would be relatively trivial to set the thing up.
1289 * For this reason, we leave the thing in the table.
1293 * set a bogus sector size so the normal read/write
1294 * logic in the block layer will eventually refuse any
1295 * request on this device without tripping over power
1296 * of two sector size assumptions
1302 * The msdos fs needs to know the hardware sector size
1303 * So I have created this table. See ll_rw_blk.c
1304 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1306 int hard_sector
= sector_size
;
1307 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1308 request_queue_t
*queue
= sdp
->request_queue
;
1311 blk_queue_hardsect_size(queue
, hard_sector
);
1312 /* avoid 64-bit division on 32-bit platforms */
1313 sector_div(sz
, 625);
1315 sector_div(mb
, 1950);
1317 printk(KERN_NOTICE
"SCSI device %s: "
1318 "%llu %d-byte hdwr sectors (%llu MB)\n",
1319 diskname
, (unsigned long long)sdkp
->capacity
,
1320 hard_sector
, (unsigned long long)mb
);
1323 /* Rescale capacity to 512-byte units */
1324 if (sector_size
== 4096)
1325 sdkp
->capacity
<<= 3;
1326 else if (sector_size
== 2048)
1327 sdkp
->capacity
<<= 2;
1328 else if (sector_size
== 1024)
1329 sdkp
->capacity
<<= 1;
1330 else if (sector_size
== 256)
1331 sdkp
->capacity
>>= 1;
1333 sdkp
->device
->sector_size
= sector_size
;
1336 /* called with buffer of length 512 */
1338 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1339 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1340 struct scsi_sense_hdr
*sshdr
)
1342 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1343 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1348 * read write protect setting, if possible - called only in sd_revalidate_disk()
1349 * called with buffer of length SD_BUF_SIZE
1352 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1353 unsigned char *buffer
)
1356 struct scsi_device
*sdp
= sdkp
->device
;
1357 struct scsi_mode_data data
;
1359 set_disk_ro(sdkp
->disk
, 0);
1360 if (sdp
->skip_ms_page_3f
) {
1361 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1365 if (sdp
->use_192_bytes_for_3f
) {
1366 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1369 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1370 * We have to start carefully: some devices hang if we ask
1371 * for more than is available.
1373 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1376 * Second attempt: ask for page 0 When only page 0 is
1377 * implemented, a request for page 3F may return Sense Key
1378 * 5: Illegal Request, Sense Code 24: Invalid field in
1381 if (!scsi_status_is_good(res
))
1382 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1385 * Third attempt: ask 255 bytes, as we did earlier.
1387 if (!scsi_status_is_good(res
))
1388 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1392 if (!scsi_status_is_good(res
)) {
1394 "%s: test WP failed, assume Write Enabled\n", diskname
);
1396 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1397 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1398 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1399 sdkp
->write_prot
? "on" : "off");
1400 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1401 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1406 * sd_read_cache_type - called only from sd_revalidate_disk()
1407 * called with buffer of length SD_BUF_SIZE
1410 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1411 unsigned char *buffer
)
1414 struct scsi_device
*sdp
= sdkp
->device
;
1418 struct scsi_mode_data data
;
1419 struct scsi_sense_hdr sshdr
;
1421 if (sdp
->skip_ms_page_8
)
1424 if (sdp
->type
== TYPE_RBC
) {
1432 /* cautiously ask */
1433 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1435 if (!scsi_status_is_good(res
))
1438 if (!data
.header_length
) {
1440 printk(KERN_ERR
"%s: missing header in MODE_SENSE response\n",
1444 /* that went OK, now ask for the proper length */
1448 * We're only interested in the first three bytes, actually.
1449 * But the data cache page is defined for the first 20.
1456 /* Take headers and block descriptors into account */
1457 len
+= data
.header_length
+ data
.block_descriptor_length
;
1458 if (len
> SD_BUF_SIZE
)
1462 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1464 if (scsi_status_is_good(res
)) {
1466 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1468 if (offset
>= SD_BUF_SIZE
- 2) {
1469 printk(KERN_ERR
"%s: malformed MODE SENSE response",
1474 if ((buffer
[offset
] & 0x3f) != modepage
) {
1475 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1479 if (modepage
== 8) {
1480 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1481 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1483 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1487 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1488 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1489 printk(KERN_NOTICE
"SCSI device %s: uses "
1490 "READ/WRITE(6), disabling FUA\n", diskname
);
1494 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1496 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s%s\n",
1497 diskname
, sd_cache_types
[ct
],
1498 sdkp
->DPOFUA
? " w/ FUA" : "");
1504 if (scsi_sense_valid(&sshdr
) &&
1505 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1506 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1507 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1508 diskname
); /* Invalid field in CDB */
1510 printk(KERN_ERR
"%s: asking for cache data failed\n",
1514 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1522 * sd_revalidate_disk - called the first time a new disk is seen,
1523 * performs disk spin up, read_capacity, etc.
1524 * @disk: struct gendisk we care about
1526 static int sd_revalidate_disk(struct gendisk
*disk
)
1528 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1529 struct scsi_device
*sdp
= sdkp
->device
;
1530 unsigned char *buffer
;
1533 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1536 * If the device is offline, don't try and read capacity or any
1537 * of the other niceties.
1539 if (!scsi_device_online(sdp
))
1542 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
| __GFP_DMA
);
1544 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1549 /* defaults, until the device tells us otherwise */
1550 sdp
->sector_size
= 512;
1552 sdkp
->media_present
= 1;
1553 sdkp
->write_prot
= 0;
1557 sd_spinup_disk(sdkp
, disk
->disk_name
);
1560 * Without media there is no reason to ask; moreover, some devices
1561 * react badly if we do.
1563 if (sdkp
->media_present
) {
1564 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1565 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1566 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1570 * We now have all cache related info, determine how we deal
1571 * with ordered requests. Note that as the current SCSI
1572 * dispatch function can alter request order, we cannot use
1573 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1576 ordered
= sdkp
->DPOFUA
1577 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1579 ordered
= QUEUE_ORDERED_DRAIN
;
1581 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1583 set_capacity(disk
, sdkp
->capacity
);
1591 * sd_probe - called during driver initialization and whenever a
1592 * new scsi device is attached to the system. It is called once
1593 * for each scsi device (not just disks) present.
1594 * @dev: pointer to device object
1596 * Returns 0 if successful (or not interested in this scsi device
1597 * (e.g. scanner)); 1 when there is an error.
1599 * Note: this function is invoked from the scsi mid-level.
1600 * This function sets up the mapping between a given
1601 * <host,channel,id,lun> (found in sdp) and new device name
1602 * (e.g. /dev/sda). More precisely it is the block device major
1603 * and minor number that is chosen here.
1605 * Assume sd_attach is not re-entrant (for time being)
1606 * Also think about sd_attach() and sd_remove() running coincidentally.
1608 static int sd_probe(struct device
*dev
)
1610 struct scsi_device
*sdp
= to_scsi_device(dev
);
1611 struct scsi_disk
*sdkp
;
1617 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1620 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1624 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1628 gd
= alloc_disk(16);
1632 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1635 spin_lock(&sd_index_lock
);
1636 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1637 spin_unlock(&sd_index_lock
);
1639 if (index
>= SD_MAX_DISKS
)
1644 class_device_initialize(&sdkp
->cdev
);
1645 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1646 sdkp
->cdev
.class = &sd_disk_class
;
1647 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1649 if (class_device_add(&sdkp
->cdev
))
1652 get_device(&sdp
->sdev_gendev
);
1655 sdkp
->driver
= &sd_template
;
1657 sdkp
->index
= index
;
1660 if (!sdp
->timeout
) {
1661 if (sdp
->type
!= TYPE_MOD
)
1662 sdp
->timeout
= SD_TIMEOUT
;
1664 sdp
->timeout
= SD_MOD_TIMEOUT
;
1667 gd
->major
= sd_major((index
& 0xf0) >> 4);
1668 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1670 gd
->fops
= &sd_fops
;
1673 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1674 } else if (index
< (26 + 1) * 26) {
1675 sprintf(gd
->disk_name
, "sd%c%c",
1676 'a' + index
/ 26 - 1,'a' + index
% 26);
1678 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1679 const unsigned int m2
= (index
/ 26 - 1) % 26;
1680 const unsigned int m3
= index
% 26;
1681 sprintf(gd
->disk_name
, "sd%c%c%c",
1682 'a' + m1
, 'a' + m2
, 'a' + m3
);
1685 gd
->private_data
= &sdkp
->driver
;
1686 gd
->queue
= sdkp
->device
->request_queue
;
1688 sd_revalidate_disk(gd
);
1690 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1691 gd
->flags
= GENHD_FL_DRIVERFS
;
1693 gd
->flags
|= GENHD_FL_REMOVABLE
;
1695 dev_set_drvdata(dev
, sdkp
);
1698 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1699 sdp
->removable
? "removable " : "", gd
->disk_name
);
1712 * sd_remove - called whenever a scsi disk (previously recognized by
1713 * sd_probe) is detached from the system. It is called (potentially
1714 * multiple times) during sd module unload.
1715 * @sdp: pointer to mid level scsi device object
1717 * Note: this function is invoked from the scsi mid-level.
1718 * This function potentially frees up a device name (e.g. /dev/sdc)
1719 * that could be re-used by a subsequent sd_probe().
1720 * This function is not called when the built-in sd driver is "exit-ed".
1722 static int sd_remove(struct device
*dev
)
1724 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1726 class_device_del(&sdkp
->cdev
);
1727 del_gendisk(sdkp
->disk
);
1730 mutex_lock(&sd_ref_mutex
);
1731 dev_set_drvdata(dev
, NULL
);
1732 class_device_put(&sdkp
->cdev
);
1733 mutex_unlock(&sd_ref_mutex
);
1739 * scsi_disk_release - Called to free the scsi_disk structure
1740 * @cdev: pointer to embedded class device
1742 * sd_ref_mutex must be held entering this routine. Because it is
1743 * called on last put, you should always use the scsi_disk_get()
1744 * scsi_disk_put() helpers which manipulate the semaphore directly
1745 * and never do a direct class_device_put().
1747 static void scsi_disk_release(struct class_device
*cdev
)
1749 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1750 struct gendisk
*disk
= sdkp
->disk
;
1752 spin_lock(&sd_index_lock
);
1753 idr_remove(&sd_index_idr
, sdkp
->index
);
1754 spin_unlock(&sd_index_lock
);
1756 disk
->private_data
= NULL
;
1758 put_device(&sdkp
->device
->sdev_gendev
);
1764 * Send a SYNCHRONIZE CACHE instruction down to the device through
1765 * the normal SCSI command structure. Wait for the command to
1768 static void sd_shutdown(struct device
*dev
)
1770 struct scsi_device
*sdp
= to_scsi_device(dev
);
1771 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1774 return; /* this can happen */
1777 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1778 sdkp
->disk
->disk_name
);
1781 scsi_disk_put(sdkp
);
1785 * init_sd - entry point for this driver (both when built in or when
1788 * Note: this function registers this driver with the scsi mid-level.
1790 static int __init
init_sd(void)
1794 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1796 for (i
= 0; i
< SD_MAJORS
; i
++)
1797 if (register_blkdev(sd_major(i
), "sd") == 0)
1803 class_register(&sd_disk_class
);
1805 return scsi_register_driver(&sd_template
.gendrv
);
1809 * exit_sd - exit point for this driver (when it is a module).
1811 * Note: this function unregisters this driver from the scsi mid-level.
1813 static void __exit
exit_sd(void)
1817 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1819 scsi_unregister_driver(&sd_template
.gendrv
);
1820 for (i
= 0; i
< SD_MAJORS
; i
++)
1821 unregister_blkdev(sd_major(i
), "sd");
1823 class_unregister(&sd_disk_class
);
1826 module_init(init_sd
);
1827 module_exit(exit_sd
);