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_store_allow_restart(struct class_device
*cdev
, const char *buf
,
213 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
214 struct scsi_device
*sdp
= sdkp
->device
;
216 if (!capable(CAP_SYS_ADMIN
))
219 if (sdp
->type
!= TYPE_DISK
)
222 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
227 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
229 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
230 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
232 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
235 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
237 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
239 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
242 static ssize_t
sd_show_allow_restart(struct class_device
*cdev
, char *buf
)
244 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
246 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
249 static struct class_device_attribute sd_disk_attrs
[] = {
250 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
251 sd_store_cache_type
),
252 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
253 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
254 sd_store_allow_restart
),
258 static struct class sd_disk_class
= {
260 .owner
= THIS_MODULE
,
261 .release
= scsi_disk_release
,
262 .class_dev_attrs
= sd_disk_attrs
,
265 static struct scsi_driver sd_template
= {
266 .owner
= THIS_MODULE
,
271 .shutdown
= sd_shutdown
,
274 .init_command
= sd_init_command
,
275 .issue_flush
= sd_issue_flush
,
279 * Device no to disk mapping:
281 * major disc2 disc p1
282 * |............|.............|....|....| <- dev_t
285 * Inside a major, we have 16k disks, however mapped non-
286 * contiguously. The first 16 disks are for major0, the next
287 * ones with major1, ... Disk 256 is for major0 again, disk 272
289 * As we stay compatible with our numbering scheme, we can reuse
290 * the well-know SCSI majors 8, 65--71, 136--143.
292 static int sd_major(int major_idx
)
296 return SCSI_DISK0_MAJOR
;
298 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
300 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
303 return 0; /* shut up gcc */
307 static inline struct scsi_disk
*scsi_disk(struct gendisk
*disk
)
309 return container_of(disk
->private_data
, struct scsi_disk
, driver
);
312 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
314 struct scsi_disk
*sdkp
= NULL
;
316 if (disk
->private_data
) {
317 sdkp
= scsi_disk(disk
);
318 if (scsi_device_get(sdkp
->device
) == 0)
319 class_device_get(&sdkp
->cdev
);
326 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
328 struct scsi_disk
*sdkp
;
330 mutex_lock(&sd_ref_mutex
);
331 sdkp
= __scsi_disk_get(disk
);
332 mutex_unlock(&sd_ref_mutex
);
336 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
338 struct scsi_disk
*sdkp
;
340 mutex_lock(&sd_ref_mutex
);
341 sdkp
= dev_get_drvdata(dev
);
343 sdkp
= __scsi_disk_get(sdkp
->disk
);
344 mutex_unlock(&sd_ref_mutex
);
348 static void scsi_disk_put(struct scsi_disk
*sdkp
)
350 struct scsi_device
*sdev
= sdkp
->device
;
352 mutex_lock(&sd_ref_mutex
);
353 class_device_put(&sdkp
->cdev
);
354 scsi_device_put(sdev
);
355 mutex_unlock(&sd_ref_mutex
);
359 * sd_init_command - build a scsi (read or write) command from
360 * information in the request structure.
361 * @SCpnt: pointer to mid-level's per scsi command structure that
362 * contains request and into which the scsi command is written
364 * Returns 1 if successful and 0 if error (or cannot be done now).
366 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
368 struct scsi_device
*sdp
= SCpnt
->device
;
369 struct request
*rq
= SCpnt
->request
;
370 struct gendisk
*disk
= rq
->rq_disk
;
371 sector_t block
= rq
->sector
;
372 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
373 unsigned int timeout
= sdp
->timeout
;
375 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
376 "count=%d\n", disk
->disk_name
,
377 (unsigned long long)block
, this_count
));
379 if (!sdp
|| !scsi_device_online(sdp
) ||
380 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
381 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
383 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt
));
389 * quietly refuse to do anything to a changed disc until
390 * the changed bit has been reset
392 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
395 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
396 disk
->disk_name
, (unsigned long long)block
));
399 * If we have a 1K hardware sectorsize, prevent access to single
400 * 512 byte sectors. In theory we could handle this - in fact
401 * the scsi cdrom driver must be able to handle this because
402 * we typically use 1K blocksizes, and cdroms typically have
403 * 2K hardware sectorsizes. Of course, things are simpler
404 * with the cdrom, since it is read-only. For performance
405 * reasons, the filesystems should be able to handle this
406 * and not force the scsi disk driver to use bounce buffers
409 if (sdp
->sector_size
== 1024) {
410 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
411 printk(KERN_ERR
"sd: Bad block number requested");
415 this_count
= this_count
>> 1;
418 if (sdp
->sector_size
== 2048) {
419 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
420 printk(KERN_ERR
"sd: Bad block number requested");
424 this_count
= this_count
>> 2;
427 if (sdp
->sector_size
== 4096) {
428 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
429 printk(KERN_ERR
"sd: Bad block number requested");
433 this_count
= this_count
>> 3;
436 if (rq_data_dir(rq
) == WRITE
) {
437 if (!sdp
->writeable
) {
440 SCpnt
->cmnd
[0] = WRITE_6
;
441 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
442 } else if (rq_data_dir(rq
) == READ
) {
443 SCpnt
->cmnd
[0] = READ_6
;
444 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
446 printk(KERN_ERR
"sd: Unknown command %x\n", rq
->cmd_flags
);
450 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
451 disk
->disk_name
, (rq_data_dir(rq
) == WRITE
) ?
452 "writing" : "reading", this_count
, rq
->nr_sectors
));
456 if (block
> 0xffffffff) {
457 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
458 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
459 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
460 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
461 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
462 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
463 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
464 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
465 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
466 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
467 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
468 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
469 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
470 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
471 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
472 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
473 SCpnt
->device
->use_10_for_rw
) {
474 if (this_count
> 0xffff)
477 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
478 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
479 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
480 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
481 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
482 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
483 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
484 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
485 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
487 if (unlikely(blk_fua_rq(rq
))) {
489 * This happens only if this drive failed
490 * 10byte rw command with ILLEGAL_REQUEST
491 * during operation and thus turned off
494 printk(KERN_ERR
"sd: FUA write on READ/WRITE(6) drive\n");
498 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
499 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
500 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
501 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
504 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
507 * We shouldn't disconnect in the middle of a sector, so with a dumb
508 * host adapter, it's safe to assume that we can at least transfer
509 * this many bytes between each connect / disconnect.
511 SCpnt
->transfersize
= sdp
->sector_size
;
512 SCpnt
->underflow
= this_count
<< 9;
513 SCpnt
->allowed
= SD_MAX_RETRIES
;
514 SCpnt
->timeout_per_command
= timeout
;
517 * This is the completion routine we use. This is matched in terms
518 * of capability to this function.
520 SCpnt
->done
= sd_rw_intr
;
523 * This indicates that the command is ready from our end to be
530 * sd_open - open a scsi disk device
531 * @inode: only i_rdev member may be used
532 * @filp: only f_mode and f_flags may be used
534 * Returns 0 if successful. Returns a negated errno value in case
537 * Note: This can be called from a user context (e.g. fsck(1) )
538 * or from within the kernel (e.g. as a result of a mount(1) ).
539 * In the latter case @inode and @filp carry an abridged amount
540 * of information as noted above.
542 static int sd_open(struct inode
*inode
, struct file
*filp
)
544 #if 0 // mask by Victor Yu. 07-24-2007
545 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
547 struct gendisk
*disk
= inode
->u
.i_bdev
->bd_disk
;
549 struct scsi_disk
*sdkp
;
550 struct scsi_device
*sdev
;
553 if (!(sdkp
= scsi_disk_get(disk
)))
557 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk
->disk_name
));
562 * If the device is in error recovery, wait until it is done.
563 * If the device is offline, then disallow any access to it.
566 if (!scsi_block_when_processing_errors(sdev
))
569 if (sdev
->removable
|| sdkp
->write_prot
)
570 #if 0 // mask by Victor Yu. 07-24-2007
571 check_disk_change(inode
->i_bdev
);
573 check_disk_change(inode
->u
.i_bdev
);
577 * If the drive is empty, just let the open fail.
580 if (sdev
->removable
&& !sdkp
->media_present
&&
581 !(filp
->f_flags
& O_NDELAY
))
585 * If the device has the write protect tab set, have the open fail
586 * if the user expects to be able to write to the thing.
589 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
593 * It is possible that the disk changing stuff resulted in
594 * the device being taken offline. If this is the case,
595 * report this to the user, and don't pretend that the
596 * open actually succeeded.
599 if (!scsi_device_online(sdev
))
602 if (!sdkp
->openers
++ && sdev
->removable
) {
603 if (scsi_block_when_processing_errors(sdev
))
604 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
615 * sd_release - invoked when the (last) close(2) is called on this
617 * @inode: only i_rdev member may be used
618 * @filp: only f_mode and f_flags may be used
622 * Note: may block (uninterruptible) if error recovery is underway
625 static int sd_release(struct inode
*inode
, struct file
*filp
)
627 #if 0 // mask by Victor Yu. 07-24-2007
628 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
630 struct gendisk
*disk
= inode
->u
.i_bdev
->bd_disk
;
632 struct scsi_disk
*sdkp
= scsi_disk(disk
);
633 struct scsi_device
*sdev
= sdkp
->device
;
635 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk
->disk_name
));
637 if (!--sdkp
->openers
&& sdev
->removable
) {
638 if (scsi_block_when_processing_errors(sdev
))
639 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
643 * XXX and what if there are packets in flight and this close()
644 * XXX is followed by a "rmmod sd_mod"?
650 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
652 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
653 struct scsi_device
*sdp
= sdkp
->device
;
654 struct Scsi_Host
*host
= sdp
->host
;
657 /* default to most commonly used values */
658 diskinfo
[0] = 0x40; /* 1 << 6 */
659 diskinfo
[1] = 0x20; /* 1 << 5 */
660 diskinfo
[2] = sdkp
->capacity
>> 11;
662 /* override with calculated, extended default, or driver values */
663 if (host
->hostt
->bios_param
)
664 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
666 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
668 geo
->heads
= diskinfo
[0];
669 geo
->sectors
= diskinfo
[1];
670 geo
->cylinders
= diskinfo
[2];
675 * sd_ioctl - process an ioctl
676 * @inode: only i_rdev/i_bdev members may be used
677 * @filp: only f_mode and f_flags may be used
678 * @cmd: ioctl command number
679 * @arg: this is third argument given to ioctl(2) system call.
680 * Often contains a pointer.
682 * Returns 0 if successful (some ioctls return postive numbers on
683 * success as well). Returns a negated errno value in case of error.
685 * Note: most ioctls are forward onto the block subsystem or further
686 * down in the scsi subsytem.
688 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
689 unsigned int cmd
, unsigned long arg
)
691 #if 0 // mask by Victor Yu. 07-24-2007
692 struct block_device
*bdev
= inode
->i_bdev
;
694 struct block_device
*bdev
= inode
->u
.i_bdev
;
696 struct gendisk
*disk
= bdev
->bd_disk
;
697 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
698 void __user
*p
= (void __user
*)arg
;
701 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
702 disk
->disk_name
, cmd
));
705 * If we are in the middle of error recovery, don't let anyone
706 * else try and use this device. Also, if error recovery fails, it
707 * may try and take the device offline, in which case all further
708 * access to the device is prohibited.
710 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
711 if (!scsi_block_when_processing_errors(sdp
) || !error
)
715 * Send SCSI addressing ioctls directly to mid level, send other
716 * ioctls to block level and then onto mid level if they can't be
720 case SCSI_IOCTL_GET_IDLUN
:
721 case SCSI_IOCTL_GET_BUS_NUMBER
:
722 return scsi_ioctl(sdp
, cmd
, p
);
724 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
725 if (error
!= -ENOTTY
)
728 return scsi_ioctl(sdp
, cmd
, p
);
731 static void set_media_not_present(struct scsi_disk
*sdkp
)
733 sdkp
->media_present
= 0;
735 sdkp
->device
->changed
= 1;
739 * sd_media_changed - check if our medium changed
740 * @disk: kernel device descriptor
742 * Returns 0 if not applicable or no change; 1 if change
744 * Note: this function is invoked from the block subsystem.
746 static int sd_media_changed(struct gendisk
*disk
)
748 struct scsi_disk
*sdkp
= scsi_disk(disk
);
749 struct scsi_device
*sdp
= sdkp
->device
;
752 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
759 * If the device is offline, don't send any commands - just pretend as
760 * if the command failed. If the device ever comes back online, we
761 * can deal with it then. It is only because of unrecoverable errors
762 * that we would ever take a device offline in the first place.
764 if (!scsi_device_online(sdp
))
768 * Using TEST_UNIT_READY enables differentiation between drive with
769 * no cartridge loaded - NOT READY, drive with changed cartridge -
770 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
772 * Drives that auto spin down. eg iomega jaz 1G, will be started
773 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
774 * sd_revalidate() is called.
777 if (scsi_block_when_processing_errors(sdp
))
778 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
781 * Unable to test, unit probably not ready. This usually
782 * means there is no disc in the drive. Mark as changed,
783 * and we will figure it out later once the drive is
790 * For removable scsi disk we have to recognise the presence
791 * of a disk in the drive. This is kept in the struct scsi_disk
792 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
794 sdkp
->media_present
= 1;
796 retval
= sdp
->changed
;
802 set_media_not_present(sdkp
);
806 static int sd_sync_cache(struct scsi_device
*sdp
)
809 struct scsi_sense_hdr sshdr
;
811 if (!scsi_device_online(sdp
))
815 for (retries
= 3; retries
> 0; --retries
) {
816 unsigned char cmd
[10] = { 0 };
818 cmd
[0] = SYNCHRONIZE_CACHE
;
820 * Leave the rest of the command zero to indicate
823 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
824 SD_TIMEOUT
, SD_MAX_RETRIES
);
829 if (res
) { printk(KERN_WARNING
"FAILED\n status = %x, message = %02x, "
830 "host = %d, driver = %02x\n ",
831 status_byte(res
), msg_byte(res
),
832 host_byte(res
), driver_byte(res
));
833 if (driver_byte(res
) & DRIVER_SENSE
)
834 scsi_print_sense_hdr("sd", &sshdr
);
840 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
843 struct scsi_device
*sdp
= to_scsi_device(dev
);
844 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
850 ret
= sd_sync_cache(sdp
);
855 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
857 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
858 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
859 rq
->timeout
= SD_TIMEOUT
;
860 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
864 static void sd_rescan(struct device
*dev
)
866 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
869 sd_revalidate_disk(sdkp
->disk
);
877 * This gets directly called from VFS. When the ioctl
878 * is not recognized we go back to the other translation paths.
880 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
882 struct block_device
*bdev
= file
->f_dentry
->d_inode
->i_bdev
;
883 struct gendisk
*disk
= bdev
->bd_disk
;
884 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
887 * If we are in the middle of error recovery, don't let anyone
888 * else try and use this device. Also, if error recovery fails, it
889 * may try and take the device offline, in which case all further
890 * access to the device is prohibited.
892 if (!scsi_block_when_processing_errors(sdev
))
895 if (sdev
->host
->hostt
->compat_ioctl
) {
898 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
904 * Let the static ioctl translation table take care of it.
910 static struct block_device_operations sd_fops
= {
911 .owner
= THIS_MODULE
,
913 .release
= sd_release
,
917 .compat_ioctl
= sd_compat_ioctl
,
919 .media_changed
= sd_media_changed
,
920 .revalidate_disk
= sd_revalidate_disk
,
924 * sd_rw_intr - bottom half handler: called when the lower level
925 * driver has completed (successfully or otherwise) a scsi command.
926 * @SCpnt: mid-level's per command structure.
928 * Note: potentially run from within an ISR. Must not block.
930 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
932 int result
= SCpnt
->result
;
933 unsigned int xfer_size
= SCpnt
->request_bufflen
;
934 unsigned int good_bytes
= result
? 0 : xfer_size
;
935 u64 start_lba
= SCpnt
->request
->sector
;
937 struct scsi_sense_hdr sshdr
;
939 int sense_deferred
= 0;
943 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
945 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
947 #ifdef CONFIG_SCSI_LOGGING
948 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
949 SCpnt
->request
->rq_disk
->disk_name
, result
));
951 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
952 "ascq]=%x,%x,%x,%x\n", sshdr
.response_code
,
953 sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
));
956 if (driver_byte(result
) != DRIVER_SENSE
&&
957 (!sense_valid
|| sense_deferred
))
960 switch (sshdr
.sense_key
) {
963 if (!blk_fs_request(SCpnt
->request
))
965 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
966 SCSI_SENSE_BUFFERSIZE
,
970 if (xfer_size
<= SCpnt
->device
->sector_size
)
972 switch (SCpnt
->device
->sector_size
) {
988 /* Print something here with limiting frequency. */
992 /* This computation should always be done in terms of
993 * the resolution of the device's medium.
995 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
997 case RECOVERED_ERROR
:
999 /* Inform the user, but make sure that it's not treated
1002 scsi_print_sense("sd", SCpnt
);
1004 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1005 good_bytes
= xfer_size
;
1007 case ILLEGAL_REQUEST
:
1008 if (SCpnt
->device
->use_10_for_rw
&&
1009 (SCpnt
->cmnd
[0] == READ_10
||
1010 SCpnt
->cmnd
[0] == WRITE_10
))
1011 SCpnt
->device
->use_10_for_rw
= 0;
1012 if (SCpnt
->device
->use_10_for_ms
&&
1013 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1014 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1015 SCpnt
->device
->use_10_for_ms
= 0;
1021 scsi_io_completion(SCpnt
, good_bytes
);
1024 static int media_not_present(struct scsi_disk
*sdkp
,
1025 struct scsi_sense_hdr
*sshdr
)
1028 if (!scsi_sense_valid(sshdr
))
1030 /* not invoked for commands that could return deferred errors */
1031 if (sshdr
->sense_key
!= NOT_READY
&&
1032 sshdr
->sense_key
!= UNIT_ATTENTION
)
1034 if (sshdr
->asc
!= 0x3A) /* medium not present */
1037 set_media_not_present(sdkp
);
1042 * spinup disk - called only in sd_revalidate_disk()
1045 sd_spinup_disk(struct scsi_disk
*sdkp
, char *diskname
)
1047 unsigned char cmd
[10];
1048 unsigned long spintime_expire
= 0;
1049 int retries
, spintime
;
1050 unsigned int the_result
;
1051 struct scsi_sense_hdr sshdr
;
1052 int sense_valid
= 0;
1056 /* Spin up drives, as required. Only do this at boot time */
1057 /* Spinup needs to be done for module loads too. */
1062 cmd
[0] = TEST_UNIT_READY
;
1063 memset((void *) &cmd
[1], 0, 9);
1065 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1071 sense_valid
= scsi_sense_valid(&sshdr
);
1073 } while (retries
< 3 &&
1074 (!scsi_status_is_good(the_result
) ||
1075 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1076 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1079 * If the drive has indicated to us that it doesn't have
1080 * any media in it, don't bother with any of the rest of
1083 if (media_not_present(sdkp
, &sshdr
))
1086 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1087 /* no sense, TUR either succeeded or failed
1088 * with a status error */
1089 if(!spintime
&& !scsi_status_is_good(the_result
))
1090 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1091 "error = 0x%x\n", diskname
, the_result
);
1096 * The device does not want the automatic start to be issued.
1098 if (sdkp
->device
->no_start_on_add
) {
1103 * If manual intervention is required, or this is an
1104 * absent USB storage device, a spinup is meaningless.
1107 sshdr
.sense_key
== NOT_READY
&&
1108 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1109 break; /* manual intervention required */
1112 * Issue command to spin up drive when not ready
1114 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1116 printk(KERN_NOTICE
"%s: Spinning up disk...",
1118 cmd
[0] = START_STOP
;
1119 cmd
[1] = 1; /* Return immediately */
1120 memset((void *) &cmd
[2], 0, 8);
1121 cmd
[4] = 1; /* Start spin cycle */
1122 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1124 SD_TIMEOUT
, SD_MAX_RETRIES
);
1125 spintime_expire
= jiffies
+ 100 * HZ
;
1128 /* Wait 1 second for next try */
1133 * Wait for USB flash devices with slow firmware.
1134 * Yes, this sense key/ASC combination shouldn't
1135 * occur here. It's characteristic of these devices.
1137 } else if (sense_valid
&&
1138 sshdr
.sense_key
== UNIT_ATTENTION
&&
1139 sshdr
.asc
== 0x28) {
1141 spintime_expire
= jiffies
+ 5 * HZ
;
1144 /* Wait 1 second for next try */
1147 /* we don't understand the sense code, so it's
1148 * probably pointless to loop */
1150 printk(KERN_NOTICE
"%s: Unit Not Ready, "
1151 "sense:\n", diskname
);
1152 scsi_print_sense_hdr("", &sshdr
);
1157 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1160 if (scsi_status_is_good(the_result
))
1163 printk("not responding...\n");
1168 * read disk capacity
1171 sd_read_capacity(struct scsi_disk
*sdkp
, char *diskname
,
1172 unsigned char *buffer
)
1174 unsigned char cmd
[16];
1175 int the_result
, retries
;
1176 int sector_size
= 0;
1178 struct scsi_sense_hdr sshdr
;
1179 int sense_valid
= 0;
1180 struct scsi_device
*sdp
= sdkp
->device
;
1186 memset((void *) cmd
, 0, 16);
1187 cmd
[0] = SERVICE_ACTION_IN
;
1188 cmd
[1] = SAI_READ_CAPACITY_16
;
1190 memset((void *) buffer
, 0, 12);
1192 cmd
[0] = READ_CAPACITY
;
1193 memset((void *) &cmd
[1], 0, 9);
1194 memset((void *) buffer
, 0, 8);
1197 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1198 buffer
, longrc
? 12 : 8, &sshdr
,
1199 SD_TIMEOUT
, SD_MAX_RETRIES
);
1201 if (media_not_present(sdkp
, &sshdr
))
1205 sense_valid
= scsi_sense_valid(&sshdr
);
1208 } while (the_result
&& retries
);
1210 if (the_result
&& !longrc
) {
1211 printk(KERN_NOTICE
"%s : READ CAPACITY failed.\n"
1212 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1214 status_byte(the_result
),
1215 msg_byte(the_result
),
1216 host_byte(the_result
),
1217 driver_byte(the_result
));
1219 if (driver_byte(the_result
) & DRIVER_SENSE
)
1220 scsi_print_sense_hdr("sd", &sshdr
);
1222 printk("%s : sense not available. \n", diskname
);
1224 /* Set dirty bit for removable devices if not ready -
1225 * sometimes drives will not report this properly. */
1226 if (sdp
->removable
&&
1227 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1230 /* Either no media are present but the drive didn't tell us,
1231 or they are present but the read capacity command fails */
1232 /* sdkp->media_present = 0; -- not always correct */
1233 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1236 } else if (the_result
&& longrc
) {
1237 /* READ CAPACITY(16) has been failed */
1238 printk(KERN_NOTICE
"%s : READ CAPACITY(16) failed.\n"
1239 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1241 status_byte(the_result
),
1242 msg_byte(the_result
),
1243 host_byte(the_result
),
1244 driver_byte(the_result
));
1245 printk(KERN_NOTICE
"%s : use 0xffffffff as device size\n",
1248 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1253 sector_size
= (buffer
[4] << 24) |
1254 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1255 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1256 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1257 if(sizeof(sdkp
->capacity
) > 4) {
1258 printk(KERN_NOTICE
"%s : very big device. try to use"
1259 " READ CAPACITY(16).\n", diskname
);
1263 printk(KERN_ERR
"%s: too big for this kernel. Use a "
1264 "kernel compiled with support for large block "
1265 "devices.\n", diskname
);
1269 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1274 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1275 ((u64
)buffer
[1] << 48) |
1276 ((u64
)buffer
[2] << 40) |
1277 ((u64
)buffer
[3] << 32) |
1278 ((sector_t
)buffer
[4] << 24) |
1279 ((sector_t
)buffer
[5] << 16) |
1280 ((sector_t
)buffer
[6] << 8) |
1281 (sector_t
)buffer
[7]);
1283 sector_size
= (buffer
[8] << 24) |
1284 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1287 /* Some devices return the total number of sectors, not the
1288 * highest sector number. Make the necessary adjustment. */
1289 if (sdp
->fix_capacity
)
1293 if (sector_size
== 0) {
1295 printk(KERN_NOTICE
"%s : sector size 0 reported, "
1296 "assuming 512.\n", diskname
);
1299 if (sector_size
!= 512 &&
1300 sector_size
!= 1024 &&
1301 sector_size
!= 2048 &&
1302 sector_size
!= 4096 &&
1303 sector_size
!= 256) {
1304 printk(KERN_NOTICE
"%s : unsupported sector size "
1305 "%d.\n", diskname
, sector_size
);
1307 * The user might want to re-format the drive with
1308 * a supported sectorsize. Once this happens, it
1309 * would be relatively trivial to set the thing up.
1310 * For this reason, we leave the thing in the table.
1314 * set a bogus sector size so the normal read/write
1315 * logic in the block layer will eventually refuse any
1316 * request on this device without tripping over power
1317 * of two sector size assumptions
1323 * The msdos fs needs to know the hardware sector size
1324 * So I have created this table. See ll_rw_blk.c
1325 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1327 int hard_sector
= sector_size
;
1328 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1329 request_queue_t
*queue
= sdp
->request_queue
;
1332 blk_queue_hardsect_size(queue
, hard_sector
);
1333 /* avoid 64-bit division on 32-bit platforms */
1334 sector_div(sz
, 625);
1336 sector_div(mb
, 1950);
1338 printk(KERN_NOTICE
"SCSI device %s: "
1339 "%llu %d-byte hdwr sectors (%llu MB)\n",
1340 diskname
, (unsigned long long)sdkp
->capacity
,
1341 hard_sector
, (unsigned long long)mb
);
1344 /* Rescale capacity to 512-byte units */
1345 if (sector_size
== 4096)
1346 sdkp
->capacity
<<= 3;
1347 else if (sector_size
== 2048)
1348 sdkp
->capacity
<<= 2;
1349 else if (sector_size
== 1024)
1350 sdkp
->capacity
<<= 1;
1351 else if (sector_size
== 256)
1352 sdkp
->capacity
>>= 1;
1354 sdkp
->device
->sector_size
= sector_size
;
1357 /* called with buffer of length 512 */
1359 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1360 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1361 struct scsi_sense_hdr
*sshdr
)
1363 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1364 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1369 * read write protect setting, if possible - called only in sd_revalidate_disk()
1370 * called with buffer of length SD_BUF_SIZE
1373 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, char *diskname
,
1374 unsigned char *buffer
)
1377 struct scsi_device
*sdp
= sdkp
->device
;
1378 struct scsi_mode_data data
;
1380 set_disk_ro(sdkp
->disk
, 0);
1381 if (sdp
->skip_ms_page_3f
) {
1382 printk(KERN_NOTICE
"%s: assuming Write Enabled\n", diskname
);
1386 if (sdp
->use_192_bytes_for_3f
) {
1387 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1390 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1391 * We have to start carefully: some devices hang if we ask
1392 * for more than is available.
1394 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1397 * Second attempt: ask for page 0 When only page 0 is
1398 * implemented, a request for page 3F may return Sense Key
1399 * 5: Illegal Request, Sense Code 24: Invalid field in
1402 if (!scsi_status_is_good(res
))
1403 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1406 * Third attempt: ask 255 bytes, as we did earlier.
1408 if (!scsi_status_is_good(res
))
1409 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1413 if (!scsi_status_is_good(res
)) {
1415 "%s: test WP failed, assume Write Enabled\n", diskname
);
1417 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1418 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1419 printk(KERN_NOTICE
"%s: Write Protect is %s\n", diskname
,
1420 sdkp
->write_prot
? "on" : "off");
1421 printk(KERN_DEBUG
"%s: Mode Sense: %02x %02x %02x %02x\n",
1422 diskname
, buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1427 * sd_read_cache_type - called only from sd_revalidate_disk()
1428 * called with buffer of length SD_BUF_SIZE
1431 sd_read_cache_type(struct scsi_disk
*sdkp
, char *diskname
,
1432 unsigned char *buffer
)
1435 struct scsi_device
*sdp
= sdkp
->device
;
1439 struct scsi_mode_data data
;
1440 struct scsi_sense_hdr sshdr
;
1442 if (sdp
->skip_ms_page_8
)
1445 if (sdp
->type
== TYPE_RBC
) {
1453 /* cautiously ask */
1454 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1456 if (!scsi_status_is_good(res
))
1459 if (!data
.header_length
) {
1461 printk(KERN_ERR
"%s: missing header in MODE_SENSE response\n",
1465 /* that went OK, now ask for the proper length */
1469 * We're only interested in the first three bytes, actually.
1470 * But the data cache page is defined for the first 20.
1477 /* Take headers and block descriptors into account */
1478 len
+= data
.header_length
+ data
.block_descriptor_length
;
1479 if (len
> SD_BUF_SIZE
)
1483 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1485 if (scsi_status_is_good(res
)) {
1487 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1489 if (offset
>= SD_BUF_SIZE
- 2) {
1490 printk(KERN_ERR
"%s: malformed MODE SENSE response",
1495 if ((buffer
[offset
] & 0x3f) != modepage
) {
1496 printk(KERN_ERR
"%s: got wrong page\n", diskname
);
1500 if (modepage
== 8) {
1501 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1502 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1504 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1508 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1509 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1510 printk(KERN_NOTICE
"SCSI device %s: uses "
1511 "READ/WRITE(6), disabling FUA\n", diskname
);
1515 ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
1517 printk(KERN_NOTICE
"SCSI device %s: drive cache: %s%s\n",
1518 diskname
, sd_cache_types
[ct
],
1519 sdkp
->DPOFUA
? " w/ FUA" : "");
1525 if (scsi_sense_valid(&sshdr
) &&
1526 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1527 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1528 printk(KERN_NOTICE
"%s: cache data unavailable\n",
1529 diskname
); /* Invalid field in CDB */
1531 printk(KERN_ERR
"%s: asking for cache data failed\n",
1535 printk(KERN_ERR
"%s: assuming drive cache: write through\n",
1543 * sd_revalidate_disk - called the first time a new disk is seen,
1544 * performs disk spin up, read_capacity, etc.
1545 * @disk: struct gendisk we care about
1547 static int sd_revalidate_disk(struct gendisk
*disk
)
1549 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1550 struct scsi_device
*sdp
= sdkp
->device
;
1551 unsigned char *buffer
;
1554 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk
->disk_name
));
1557 * If the device is offline, don't try and read capacity or any
1558 * of the other niceties.
1560 if (!scsi_device_online(sdp
))
1563 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
| __GFP_DMA
);
1565 printk(KERN_WARNING
"(sd_revalidate_disk:) Memory allocation "
1570 /* defaults, until the device tells us otherwise */
1571 sdp
->sector_size
= 512;
1573 sdkp
->media_present
= 1;
1574 sdkp
->write_prot
= 0;
1578 sd_spinup_disk(sdkp
, disk
->disk_name
);
1581 * Without media there is no reason to ask; moreover, some devices
1582 * react badly if we do.
1584 if (sdkp
->media_present
) {
1585 sd_read_capacity(sdkp
, disk
->disk_name
, buffer
);
1586 sd_read_write_protect_flag(sdkp
, disk
->disk_name
, buffer
);
1587 sd_read_cache_type(sdkp
, disk
->disk_name
, buffer
);
1591 * We now have all cache related info, determine how we deal
1592 * with ordered requests. Note that as the current SCSI
1593 * dispatch function can alter request order, we cannot use
1594 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1597 ordered
= sdkp
->DPOFUA
1598 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1600 ordered
= QUEUE_ORDERED_DRAIN
;
1602 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1604 set_capacity(disk
, sdkp
->capacity
);
1612 * sd_probe - called during driver initialization and whenever a
1613 * new scsi device is attached to the system. It is called once
1614 * for each scsi device (not just disks) present.
1615 * @dev: pointer to device object
1617 * Returns 0 if successful (or not interested in this scsi device
1618 * (e.g. scanner)); 1 when there is an error.
1620 * Note: this function is invoked from the scsi mid-level.
1621 * This function sets up the mapping between a given
1622 * <host,channel,id,lun> (found in sdp) and new device name
1623 * (e.g. /dev/sda). More precisely it is the block device major
1624 * and minor number that is chosen here.
1626 * Assume sd_attach is not re-entrant (for time being)
1627 * Also think about sd_attach() and sd_remove() running coincidentally.
1629 static int sd_probe(struct device
*dev
)
1631 struct scsi_device
*sdp
= to_scsi_device(dev
);
1632 struct scsi_disk
*sdkp
;
1638 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1641 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1645 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1649 gd
= alloc_disk(16);
1653 if (!idr_pre_get(&sd_index_idr
, GFP_KERNEL
))
1656 spin_lock(&sd_index_lock
);
1657 error
= idr_get_new(&sd_index_idr
, NULL
, &index
);
1658 spin_unlock(&sd_index_lock
);
1660 if (index
>= SD_MAX_DISKS
)
1665 class_device_initialize(&sdkp
->cdev
);
1666 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1667 sdkp
->cdev
.class = &sd_disk_class
;
1668 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1670 if (class_device_add(&sdkp
->cdev
))
1673 get_device(&sdp
->sdev_gendev
);
1676 sdkp
->driver
= &sd_template
;
1678 sdkp
->index
= index
;
1681 if (!sdp
->timeout
) {
1682 if (sdp
->type
!= TYPE_MOD
)
1683 sdp
->timeout
= SD_TIMEOUT
;
1685 sdp
->timeout
= SD_MOD_TIMEOUT
;
1688 gd
->major
= sd_major((index
& 0xf0) >> 4);
1689 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1691 gd
->fops
= &sd_fops
;
1694 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1695 } else if (index
< (26 + 1) * 26) {
1696 sprintf(gd
->disk_name
, "sd%c%c",
1697 'a' + index
/ 26 - 1,'a' + index
% 26);
1699 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1700 const unsigned int m2
= (index
/ 26 - 1) % 26;
1701 const unsigned int m3
= index
% 26;
1702 sprintf(gd
->disk_name
, "sd%c%c%c",
1703 'a' + m1
, 'a' + m2
, 'a' + m3
);
1706 gd
->private_data
= &sdkp
->driver
;
1707 gd
->queue
= sdkp
->device
->request_queue
;
1709 sd_revalidate_disk(gd
);
1711 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1712 gd
->flags
= GENHD_FL_DRIVERFS
;
1714 gd
->flags
|= GENHD_FL_REMOVABLE
;
1716 dev_set_drvdata(dev
, sdkp
);
1719 sdev_printk(KERN_NOTICE
, sdp
, "Attached scsi %sdisk %s\n",
1720 sdp
->removable
? "removable " : "", gd
->disk_name
);
1733 * sd_remove - called whenever a scsi disk (previously recognized by
1734 * sd_probe) is detached from the system. It is called (potentially
1735 * multiple times) during sd module unload.
1736 * @sdp: pointer to mid level scsi device object
1738 * Note: this function is invoked from the scsi mid-level.
1739 * This function potentially frees up a device name (e.g. /dev/sdc)
1740 * that could be re-used by a subsequent sd_probe().
1741 * This function is not called when the built-in sd driver is "exit-ed".
1743 static int sd_remove(struct device
*dev
)
1745 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1747 class_device_del(&sdkp
->cdev
);
1748 del_gendisk(sdkp
->disk
);
1751 mutex_lock(&sd_ref_mutex
);
1752 dev_set_drvdata(dev
, NULL
);
1753 class_device_put(&sdkp
->cdev
);
1754 mutex_unlock(&sd_ref_mutex
);
1760 * scsi_disk_release - Called to free the scsi_disk structure
1761 * @cdev: pointer to embedded class device
1763 * sd_ref_mutex must be held entering this routine. Because it is
1764 * called on last put, you should always use the scsi_disk_get()
1765 * scsi_disk_put() helpers which manipulate the semaphore directly
1766 * and never do a direct class_device_put().
1768 static void scsi_disk_release(struct class_device
*cdev
)
1770 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1771 struct gendisk
*disk
= sdkp
->disk
;
1773 spin_lock(&sd_index_lock
);
1774 idr_remove(&sd_index_idr
, sdkp
->index
);
1775 spin_unlock(&sd_index_lock
);
1777 disk
->private_data
= NULL
;
1779 put_device(&sdkp
->device
->sdev_gendev
);
1785 * Send a SYNCHRONIZE CACHE instruction down to the device through
1786 * the normal SCSI command structure. Wait for the command to
1789 static void sd_shutdown(struct device
*dev
)
1791 struct scsi_device
*sdp
= to_scsi_device(dev
);
1792 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1795 return; /* this can happen */
1798 printk(KERN_NOTICE
"Synchronizing SCSI cache for disk %s: \n",
1799 sdkp
->disk
->disk_name
);
1802 scsi_disk_put(sdkp
);
1806 * init_sd - entry point for this driver (both when built in or when
1809 * Note: this function registers this driver with the scsi mid-level.
1811 static int __init
init_sd(void)
1813 int majors
= 0, i
, err
;
1815 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1817 for (i
= 0; i
< SD_MAJORS
; i
++)
1818 if (register_blkdev(sd_major(i
), "sd") == 0)
1824 err
= class_register(&sd_disk_class
);
1828 err
= scsi_register_driver(&sd_template
.gendrv
);
1835 class_unregister(&sd_disk_class
);
1837 for (i
= 0; i
< SD_MAJORS
; i
++)
1838 unregister_blkdev(sd_major(i
), "sd");
1843 * exit_sd - exit point for this driver (when it is a module).
1845 * Note: this function unregisters this driver from the scsi mid-level.
1847 static void __exit
exit_sd(void)
1851 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1853 scsi_unregister_driver(&sd_template
.gendrv
);
1854 class_unregister(&sd_disk_class
);
1856 for (i
= 0; i
< SD_MAJORS
; i
++)
1857 unregister_blkdev(sd_major(i
), "sd");
1860 module_init(init_sd
);
1861 module_exit(exit_sd
);