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[SCSI] sd: Avoid remapping bad reference tags
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / sd.c
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1da177e4
LT		 1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
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.
25 *
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.
33 */
34
1da177e4
LT		 35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
1da177e4
LT		 38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/genhd.h>
41#include <linux/hdreg.h>
42#include <linux/errno.h>
43#include <linux/idr.h>
44#include <linux/interrupt.h>
45#include <linux/init.h>
46#include <linux/blkdev.h>
47#include <linux/blkpg.h>
1da177e4 48#include <linux/delay.h>
0b950672 49#include <linux/mutex.h>
7404ad3b 50#include <linux/string_helpers.h>
4ace92fc 51#include <linux/async.h>
5a0e3ad6 52#include <linux/slab.h>
54f57588 53#include <linux/pm_runtime.h>
1da177e4 54#include <asm/uaccess.h>
8f76d151 55#include <asm/unaligned.h>
1da177e4
LT		 56
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
1da177e4
LT		 65#include <scsi/scsicam.h>
66
aa91696e 67#include "sd.h"
a7a20d10 68#include "scsi_priv.h"
1da177e4
LT		 69#include "scsi_logging.h"
70
f018fa55
RH		 71MODULE_AUTHOR("Eric Youngdale");
72MODULE_DESCRIPTION("SCSI disk (sd) driver");
73MODULE_LICENSE("GPL");
74
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
d7b8bcb0
MT		 91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
f018fa55 94
870d6656 95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
f615b48c 96#define SD_MINORS 16
870d6656 97#else
3e1a7ff8 98#define SD_MINORS 0
870d6656
TH		 99#endif
100
c98a0eb0 101static void sd_config_discard(struct scsi_disk *, unsigned int);
7b3d9545 102static int sd_revalidate_disk(struct gendisk *);
72ec24bd 103static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 104static int sd_probe(struct device *);
105static int sd_remove(struct device *);
106static void sd_shutdown(struct device *);
107static int sd_suspend(struct device *, pm_message_t state);
108static int sd_resume(struct device *);
109static void sd_rescan(struct device *);
110static int sd_done(struct scsi_cmnd *);
18a4d0a2 111static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 112static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 113static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 114static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115static void sd_print_result(struct scsi_disk *, int);
116
4034cc68 117static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 118static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 119
120/* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
0b950672 123static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 124
439d77f7
HS		 125static struct kmem_cache *sd_cdb_cache;
126static mempool_t *sd_cdb_pool;
4e7392ec 127
6bdaa1f1
JB		 128static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131};
132
ee959b00
TJ		 133static ssize_t
134sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
6bdaa1f1
JB		 136{
137 int i, ct = -1, rcd, wce, sp;
ee959b00 138 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
6391a113 152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 153 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
a9312fb8 167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
e73aec82 178 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 179 return -EINVAL;
180 }
f98a8cae 181 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 182 return count;
183}
184
ee959b00
TJ		 185static ssize_t
186sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
c3c94c5a 188{
ee959b00 189 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198}
199
ee959b00
TJ		 200static ssize_t
201sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
a144c5ae 203{
ee959b00 204 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216}
217
ee959b00
TJ		 218static ssize_t
219sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
6bdaa1f1 221{
ee959b00 222 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226}
227
ee959b00
TJ		 228static ssize_t
229sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 230{
ee959b00 231 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234}
235
ee959b00
TJ		 236static ssize_t
237sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
c3c94c5a 239{
ee959b00 240 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244}
245
ee959b00
TJ		 246static ssize_t
247sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
a144c5ae 249{
ee959b00 250 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253}
254
e0597d70
MP		 255static ssize_t
256sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262}
263
518fa8e3
MP		 264static ssize_t
265sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
266 char *buf)
267{
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 struct scsi_device *sdp = sdkp->device;
270 unsigned int dif, dix;
271
272 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
273 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
274
275 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
276 dif = 0;
277 dix = 1;
278 }
279
280 if (!dif && !dix)
281 return snprintf(buf, 20, "none\n");
282
283 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284}
285
e0597d70
MP		 286static ssize_t
287sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
288 char *buf)
289{
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291
292 return snprintf(buf, 20, "%u\n", sdkp->ATO);
293}
294
e339c1a7
MP		 295static ssize_t
296sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
297 char *buf)
298{
299 struct scsi_disk *sdkp = to_scsi_disk(dev);
300
c98a0eb0
MP		 301 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
302}
303
304static const char *lbp_mode[] = {
305 [SD_LBP_FULL] = "full",
306 [SD_LBP_UNMAP] = "unmap",
307 [SD_LBP_WS16] = "writesame_16",
308 [SD_LBP_WS10] = "writesame_10",
309 [SD_LBP_ZERO] = "writesame_zero",
310 [SD_LBP_DISABLE] = "disabled",
311};
312
313static ssize_t
314sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 struct scsi_disk *sdkp = to_scsi_disk(dev);
318
319 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
320}
321
322static ssize_t
323sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
324 const char *buf, size_t count)
325{
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328
329 if (!capable(CAP_SYS_ADMIN))
330 return -EACCES;
331
332 if (sdp->type != TYPE_DISK)
333 return -EINVAL;
334
335 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
336 sd_config_discard(sdkp, SD_LBP_UNMAP);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
338 sd_config_discard(sdkp, SD_LBP_WS16);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
340 sd_config_discard(sdkp, SD_LBP_WS10);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
342 sd_config_discard(sdkp, SD_LBP_ZERO);
343 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
344 sd_config_discard(sdkp, SD_LBP_DISABLE);
345 else
346 return -EINVAL;
347
348 return count;
e339c1a7
MP		 349}
350
18a4d0a2
MP		 351static ssize_t
352sd_show_max_medium_access_timeouts(struct device *dev,
353 struct device_attribute *attr, char *buf)
354{
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
358}
359
360static ssize_t
361sd_store_max_medium_access_timeouts(struct device *dev,
362 struct device_attribute *attr,
363 const char *buf, size_t count)
364{
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
366 int err;
367
368 if (!capable(CAP_SYS_ADMIN))
369 return -EACCES;
370
371 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
372
373 return err ? err : count;
374}
375
ee959b00 376static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 377 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
378 sd_store_cache_type),
379 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 380 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
381 sd_store_allow_restart),
c3c94c5a
TH		 382 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
383 sd_store_manage_start_stop),
e0597d70 384 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
518fa8e3 385 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 386 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 387 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 388 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
389 sd_store_provisioning_mode),
18a4d0a2
MP		 390 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
391 sd_show_max_medium_access_timeouts,
392 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 393 __ATTR_NULL,
394};
395
396static struct class sd_disk_class = {
397 .name = "scsi_disk",
398 .owner = THIS_MODULE,
ee959b00
TJ		 399 .dev_release = scsi_disk_release,
400 .dev_attrs = sd_disk_attrs,
6bdaa1f1 401};
1da177e4
LT		 402
403static struct scsi_driver sd_template = {
404 .owner = THIS_MODULE,
405 .gendrv = {
406 .name = "sd",
407 .probe = sd_probe,
408 .remove = sd_remove,
c3c94c5a
TH		 409 .suspend = sd_suspend,
410 .resume = sd_resume,
1da177e4
LT		 411 .shutdown = sd_shutdown,
412 },
413 .rescan = sd_rescan,
7b3d9545 414 .done = sd_done,
18a4d0a2 415 .eh_action = sd_eh_action,
1da177e4
LT		 416};
417
418/*
419 * Device no to disk mapping:
420 *
421 * major disc2 disc p1
422 * |............|.............|....|....| <- dev_t
423 * 31 20 19 8 7 4 3 0
424 *
425 * Inside a major, we have 16k disks, however mapped non-
426 * contiguously. The first 16 disks are for major0, the next
427 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * for major1, ...
429 * As we stay compatible with our numbering scheme, we can reuse
430 * the well-know SCSI majors 8, 65--71, 136--143.
431 */
432static int sd_major(int major_idx)
433{
434 switch (major_idx) {
435 case 0:
436 return SCSI_DISK0_MAJOR;
437 case 1 ... 7:
438 return SCSI_DISK1_MAJOR + major_idx - 1;
439 case 8 ... 15:
440 return SCSI_DISK8_MAJOR + major_idx - 8;
441 default:
442 BUG();
443 return 0; /* shut up gcc */
444 }
445}
446
39b7f1e2 447static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 448{
449 struct scsi_disk *sdkp = NULL;
450
39b7f1e2
AS		 451 if (disk->private_data) {
452 sdkp = scsi_disk(disk);
453 if (scsi_device_get(sdkp->device) == 0)
ee959b00 454 get_device(&sdkp->dev);
39b7f1e2
AS		 455 else
456 sdkp = NULL;
457 }
458 return sdkp;
459}
460
461static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
462{
463 struct scsi_disk *sdkp;
464
0b950672 465 mutex_lock(&sd_ref_mutex);
39b7f1e2 466 sdkp = __scsi_disk_get(disk);
0b950672 467 mutex_unlock(&sd_ref_mutex);
1da177e4 468 return sdkp;
39b7f1e2 469}
1da177e4 470
39b7f1e2
AS		 471static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
472{
473 struct scsi_disk *sdkp;
474
0b950672 475 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 476 sdkp = dev_get_drvdata(dev);
477 if (sdkp)
478 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 479 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 480 return sdkp;
481}
482
483static void scsi_disk_put(struct scsi_disk *sdkp)
484{
485 struct scsi_device *sdev = sdkp->device;
486
0b950672 487 mutex_lock(&sd_ref_mutex);
ee959b00 488 put_device(&sdkp->dev);
1da177e4 489 scsi_device_put(sdev);
0b950672 490 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 491}
492
35e1a5d9
MP		 493static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
494{
495 unsigned int prot_op = SCSI_PROT_NORMAL;
496 unsigned int dix = scsi_prot_sg_count(scmd);
497
498 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
499 if (dif && dix)
500 prot_op = SCSI_PROT_READ_PASS;
501 else if (dif && !dix)
502 prot_op = SCSI_PROT_READ_STRIP;
503 else if (!dif && dix)
504 prot_op = SCSI_PROT_READ_INSERT;
505 } else {
506 if (dif && dix)
507 prot_op = SCSI_PROT_WRITE_PASS;
508 else if (dif && !dix)
509 prot_op = SCSI_PROT_WRITE_INSERT;
510 else if (!dif && dix)
511 prot_op = SCSI_PROT_WRITE_STRIP;
512 }
513
514 scsi_set_prot_op(scmd, prot_op);
515 scsi_set_prot_type(scmd, dif);
516}
517
c98a0eb0
MP		 518static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
519{
520 struct request_queue *q = sdkp->disk->queue;
521 unsigned int logical_block_size = sdkp->device->sector_size;
522 unsigned int max_blocks = 0;
523
524 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 525 q->limits.discard_alignment = sdkp->unmap_alignment *
526 logical_block_size;
c98a0eb0
MP		 527 q->limits.discard_granularity =
528 max(sdkp->physical_block_size,
529 sdkp->unmap_granularity * logical_block_size);
530
89730393
MP		 531 sdkp->provisioning_mode = mode;
532
c98a0eb0
MP		 533 switch (mode) {
534
535 case SD_LBP_DISABLE:
536 q->limits.max_discard_sectors = 0;
537 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
538 return;
539
540 case SD_LBP_UNMAP:
541 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
542 break;
543
544 case SD_LBP_WS16:
545 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
546 break;
547
548 case SD_LBP_WS10:
549 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
550 break;
551
552 case SD_LBP_ZERO:
553 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
554 q->limits.discard_zeroes_data = 1;
555 break;
556 }
557
558 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
559 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 560}
561
e339c1a7 562/**
66ac0280
CH		 563 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
564 * @sdp: scsi device to operate one
e339c1a7
MP		 565 * @rq: Request to prepare
566 *
567 * Will issue either UNMAP or WRITE SAME(16) depending on preference
568 * indicated by target device.
569 **/
66ac0280 570static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 571{
572 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
573 struct bio *bio = rq->bio;
574 sector_t sector = bio->bi_sector;
66ac0280
CH		 575 unsigned int nr_sectors = bio_sectors(bio);
576 unsigned int len;
f1126e95 577 int ret;
c98a0eb0 578 char *buf;
66ac0280 579 struct page *page;
e339c1a7
MP		 580
581 if (sdkp->device->sector_size == 4096) {
582 sector >>= 3;
66ac0280 583 nr_sectors >>= 3;
e339c1a7
MP		 584 }
585
e339c1a7
MP		 586 rq->timeout = SD_TIMEOUT;
587
588 memset(rq->cmd, 0, rq->cmd_len);
589
66ac0280
CH		 590 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
591 if (!page)
592 return BLKPREP_DEFER;
593
c98a0eb0
MP		 594 switch (sdkp->provisioning_mode) {
595 case SD_LBP_UNMAP:
596 buf = page_address(page);
e339c1a7 597
66ac0280 598 rq->cmd_len = 10;
e339c1a7
MP		 599 rq->cmd[0] = UNMAP;
600 rq->cmd[8] = 24;
e339c1a7
MP		 601
602 put_unaligned_be16(6 + 16, &buf[0]);
603 put_unaligned_be16(16, &buf[2]);
604 put_unaligned_be64(sector, &buf[8]);
66ac0280 605 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 606
66ac0280 607 len = 24;
c98a0eb0
MP		 608 break;
609
610 case SD_LBP_WS16:
66ac0280 611 rq->cmd_len = 16;
e339c1a7
MP		 612 rq->cmd[0] = WRITE_SAME_16;
613 rq->cmd[1] = 0x8; /* UNMAP */
614 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 615 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
616
617 len = sdkp->device->sector_size;
c98a0eb0
MP		 618 break;
619
620 case SD_LBP_WS10:
621 case SD_LBP_ZERO:
622 rq->cmd_len = 10;
623 rq->cmd[0] = WRITE_SAME;
624 if (sdkp->provisioning_mode == SD_LBP_WS10)
625 rq->cmd[1] = 0x8; /* UNMAP */
626 put_unaligned_be32(sector, &rq->cmd[2]);
627 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
628
629 len = sdkp->device->sector_size;
630 break;
631
632 default:
09b9cc44 633 ret = BLKPREP_KILL;
c98a0eb0 634 goto out;
e339c1a7
MP		 635 }
636
66ac0280 637 blk_add_request_payload(rq, page, len);
f1126e95
FT		 638 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
639 rq->buffer = page_address(page);
c98a0eb0
MP		 640
641out:
610a6349
FT		 642 if (ret != BLKPREP_OK) {
643 __free_page(page);
644 rq->buffer = NULL;
645 }
f1126e95
FT		 646 return ret;
647}
648
90467c29
FT		 649static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
650{
e3b3e624 651 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 652 rq->retries = SD_MAX_RETRIES;
653 rq->cmd[0] = SYNCHRONIZE_CACHE;
654 rq->cmd_len = 10;
655
656 return scsi_setup_blk_pc_cmnd(sdp, rq);
657}
658
f1126e95
FT		 659static void sd_unprep_fn(struct request_queue *q, struct request *rq)
660{
610a6349
FT		 661 if (rq->cmd_flags & REQ_DISCARD) {
662 free_page((unsigned long)rq->buffer);
663 rq->buffer = NULL;
664 }
e339c1a7
MP		 665}
666
1da177e4 667/**
2db93ce8 668 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 669 * information in the request structure.
670 * @SCpnt: pointer to mid-level's per scsi command structure that
671 * contains request and into which the scsi command is written
672 *
673 * Returns 1 if successful and 0 if error (or cannot be done now).
674 **/
7f9a6bc4 675static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 676{
7f9a6bc4
JB		 677 struct scsi_cmnd *SCpnt;
678 struct scsi_device *sdp = q->queuedata;
776b23a0 679 struct gendisk *disk = rq->rq_disk;
af55ff67 680 struct scsi_disk *sdkp;
83096ebf 681 sector_t block = blk_rq_pos(rq);
18351070 682 sector_t threshold;
83096ebf 683 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 684 int ret, host_dif;
4e7392ec 685 unsigned char protect;
7f9a6bc4 686
e339c1a7
MP		 687 /*
688 * Discard request come in as REQ_TYPE_FS but we turn them into
689 * block PC requests to make life easier.
690 */
66ac0280
CH		 691 if (rq->cmd_flags & REQ_DISCARD) {
692 ret = scsi_setup_discard_cmnd(sdp, rq);
693 goto out;
90467c29
FT		 694 } else if (rq->cmd_flags & REQ_FLUSH) {
695 ret = scsi_setup_flush_cmnd(sdp, rq);
696 goto out;
66ac0280 697 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 698 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
699 goto out;
700 } else if (rq->cmd_type != REQ_TYPE_FS) {
701 ret = BLKPREP_KILL;
702 goto out;
703 }
704 ret = scsi_setup_fs_cmnd(sdp, rq);
705 if (ret != BLKPREP_OK)
706 goto out;
707 SCpnt = rq->special;
af55ff67 708 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 709
710 /* from here on until we're complete, any goto out
711 * is used for a killable error condition */
712 ret = BLKPREP_KILL;
1da177e4 713
fa0d34be 714 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 715 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 716 "count=%d\n",
717 (unsigned long long)block,
718 this_count));
1da177e4
LT		 719
720 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 721 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 722 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 723 "Finishing %u sectors\n",
724 blk_rq_sectors(rq)));
fa0d34be
MP		 725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
726 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 727 goto out;
1da177e4
LT		 728 }
729
730 if (sdp->changed) {
731 /*
732 * quietly refuse to do anything to a changed disc until
733 * the changed bit has been reset
734 */
3ff5588d 735 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 736 goto out;
1da177e4 737 }
7f9a6bc4 738
a0899d4d 739 /*
18351070
LT		 740 * Some SD card readers can't handle multi-sector accesses which touch
741 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 742 */
18351070
LT		 743 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
744 (sdp->sector_size / 512);
745
746 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
747 if (block < threshold) {
748 /* Access up to the threshold but not beyond */
749 this_count = threshold - block;
750 } else {
751 /* Access only a single hardware sector */
752 this_count = sdp->sector_size / 512;
753 }
754 }
a0899d4d 755
fa0d34be
MP		 756 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
757 (unsigned long long)block));
1da177e4
LT		 758
759 /*
760 * If we have a 1K hardware sectorsize, prevent access to single
761 * 512 byte sectors. In theory we could handle this - in fact
762 * the scsi cdrom driver must be able to handle this because
763 * we typically use 1K blocksizes, and cdroms typically have
764 * 2K hardware sectorsizes. Of course, things are simpler
765 * with the cdrom, since it is read-only. For performance
766 * reasons, the filesystems should be able to handle this
767 * and not force the scsi disk driver to use bounce buffers
768 * for this.
769 */
770 if (sdp->sector_size == 1024) {
83096ebf 771 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
7f9a6bc4 774 goto out;
1da177e4
LT		 775 } else {
776 block = block >> 1;
777 this_count = this_count >> 1;
778 }
779 }
780 if (sdp->sector_size == 2048) {
83096ebf 781 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
7f9a6bc4 784 goto out;
1da177e4
LT		 785 } else {
786 block = block >> 2;
787 this_count = this_count >> 2;
788 }
789 }
790 if (sdp->sector_size == 4096) {
83096ebf 791 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 792 scmd_printk(KERN_ERR, SCpnt,
793 "Bad block number requested\n");
7f9a6bc4 794 goto out;
1da177e4
LT		 795 } else {
796 block = block >> 3;
797 this_count = this_count >> 3;
798 }
799 }
800 if (rq_data_dir(rq) == WRITE) {
801 if (!sdp->writeable) {
7f9a6bc4 802 goto out;
1da177e4
LT		 803 }
804 SCpnt->cmnd[0] = WRITE_6;
805 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 806
8c579ab6
MP		 807 if (blk_integrity_rq(rq))
808 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 809
1da177e4
LT		 810 } else if (rq_data_dir(rq) == READ) {
811 SCpnt->cmnd[0] = READ_6;
812 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
813 } else {
e73aec82 814 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 815 goto out;
1da177e4
LT		 816 }
817
fa0d34be 818 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 819 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 820 (rq_data_dir(rq) == WRITE) ?
821 "writing" : "reading", this_count,
83096ebf 822 blk_rq_sectors(rq)));
1da177e4 823
af55ff67 824 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 825 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
826 if (host_dif)
4e7392ec 827 protect = 1 << 5;
af55ff67 828 else
4e7392ec
MP		 829 protect = 0;
830
831 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
832 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
833
834 if (unlikely(SCpnt->cmnd == NULL)) {
835 ret = BLKPREP_DEFER;
836 goto out;
837 }
af55ff67 838
4e7392ec
MP		 839 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
840 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
841 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
842 SCpnt->cmnd[7] = 0x18;
843 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 844 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 845
846 /* LBA */
847 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
848 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
849 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
850 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
851 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
852 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
853 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
854 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
855
856 /* Expected Indirect LBA */
857 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
858 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
859 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
860 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
861
862 /* Transfer length */
863 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
864 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
865 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
866 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
867 } else if (block > 0xffffffff) {
1da177e4 868 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 869 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 870 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
871 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
872 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
873 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
874 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
875 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
876 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
877 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
878 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
879 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
880 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
881 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
882 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
883 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 884 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 885 SCpnt->device->use_10_for_rw) {
886 if (this_count > 0xffff)
887 this_count = 0xffff;
888
889 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 890 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 891 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
892 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
893 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
894 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
895 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
896 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
897 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
898 } else {
33659ebb 899 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 900 /*
901 * This happens only if this drive failed
902 * 10byte rw command with ILLEGAL_REQUEST
903 * during operation and thus turned off
904 * use_10_for_rw.
905 */
e73aec82
MP		 906 scmd_printk(KERN_ERR, SCpnt,
907 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 908 goto out;
007365ad
TH		 909 }
910
1da177e4
LT		 911 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
912 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
913 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
914 SCpnt->cmnd[4] = (unsigned char) this_count;
915 SCpnt->cmnd[5] = 0;
916 }
30b0c37b 917 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 918
af55ff67 919 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 920 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 921 sd_prot_op(SCpnt, host_dif);
af55ff67 922
1da177e4
LT		 923 /*
924 * We shouldn't disconnect in the middle of a sector, so with a dumb
925 * host adapter, it's safe to assume that we can at least transfer
926 * this many bytes between each connect / disconnect.
927 */
928 SCpnt->transfersize = sdp->sector_size;
929 SCpnt->underflow = this_count << 9;
930 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 931
1da177e4
LT		 932 /*
933 * This indicates that the command is ready from our end to be
934 * queued.
935 */
7f9a6bc4
JB		 936 ret = BLKPREP_OK;
937 out:
938 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 939}
940
941/**
942 * sd_open - open a scsi disk device
943 * @inode: only i_rdev member may be used
944 * @filp: only f_mode and f_flags may be used
945 *
946 * Returns 0 if successful. Returns a negated errno value in case
947 * of error.
948 *
949 * Note: This can be called from a user context (e.g. fsck(1) )
950 * or from within the kernel (e.g. as a result of a mount(1) ).
951 * In the latter case @inode and @filp carry an abridged amount
952 * of information as noted above.
409f3499
AB		 953 *
954 * Locking: called with bdev->bd_mutex held.
1da177e4 955 **/
0338e291 956static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 957{
0338e291 958 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 959 struct scsi_device *sdev;
960 int retval;
961
0338e291 962 if (!sdkp)
1da177e4
LT		 963 return -ENXIO;
964
fa0d34be 965 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 966
967 sdev = sdkp->device;
968
478a8a05
AS		 969 retval = scsi_autopm_get_device(sdev);
970 if (retval)
971 goto error_autopm;
972
1da177e4
LT		 973 /*
974 * If the device is in error recovery, wait until it is done.
975 * If the device is offline, then disallow any access to it.
976 */
977 retval = -ENXIO;
978 if (!scsi_block_when_processing_errors(sdev))
979 goto error_out;
980
981 if (sdev->removable || sdkp->write_prot)
0338e291 982 check_disk_change(bdev);
1da177e4
LT		 983
984 /*
985 * If the drive is empty, just let the open fail.
986 */
987 retval = -ENOMEDIUM;
0338e291 988 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 989 goto error_out;
990
991 /*
992 * If the device has the write protect tab set, have the open fail
993 * if the user expects to be able to write to the thing.
994 */
995 retval = -EROFS;
0338e291 996 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 997 goto error_out;
998
999 /*
1000 * It is possible that the disk changing stuff resulted in
1001 * the device being taken offline. If this is the case,
1002 * report this to the user, and don't pretend that the
1003 * open actually succeeded.
1004 */
1005 retval = -ENXIO;
1006 if (!scsi_device_online(sdev))
1007 goto error_out;
1008
409f3499 1009 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1010 if (scsi_block_when_processing_errors(sdev))
1011 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1012 }
1013
1014 return 0;
1015
1016error_out:
478a8a05
AS		 1017 scsi_autopm_put_device(sdev);
1018error_autopm:
1da177e4
LT		 1019 scsi_disk_put(sdkp);
1020 return retval;
1021}
1022
1023/**
1024 * sd_release - invoked when the (last) close(2) is called on this
1025 * scsi disk.
1026 * @inode: only i_rdev member may be used
1027 * @filp: only f_mode and f_flags may be used
1028 *
1029 * Returns 0.
1030 *
1031 * Note: may block (uninterruptible) if error recovery is underway
1032 * on this disk.
409f3499
AB		 1033 *
1034 * Locking: called with bdev->bd_mutex held.
1da177e4 1035 **/
0338e291 1036static int sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1037{
1da177e4
LT		 1038 struct scsi_disk *sdkp = scsi_disk(disk);
1039 struct scsi_device *sdev = sdkp->device;
1040
56937f7b 1041 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1042
7e443312 1043 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1044 if (scsi_block_when_processing_errors(sdev))
1045 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1046 }
1047
1048 /*
1049 * XXX and what if there are packets in flight and this close()
1050 * XXX is followed by a "rmmod sd_mod"?
1051 */
478a8a05
AS		 1052
1053 scsi_autopm_put_device(sdev);
1da177e4
LT		 1054 scsi_disk_put(sdkp);
1055 return 0;
1056}
1057
a885c8c4 1058static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1059{
1060 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1061 struct scsi_device *sdp = sdkp->device;
1062 struct Scsi_Host *host = sdp->host;
1063 int diskinfo[4];
1064
1065 /* default to most commonly used values */
1066 diskinfo[0] = 0x40; /* 1 << 6 */
1067 diskinfo[1] = 0x20; /* 1 << 5 */
1068 diskinfo[2] = sdkp->capacity >> 11;
1069
1070 /* override with calculated, extended default, or driver values */
1071 if (host->hostt->bios_param)
1072 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1073 else
1074 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1075
a885c8c4
CH		 1076 geo->heads = diskinfo[0];
1077 geo->sectors = diskinfo[1];
1078 geo->cylinders = diskinfo[2];
1da177e4
LT		 1079 return 0;
1080}
1081
1082/**
1083 * sd_ioctl - process an ioctl
1084 * @inode: only i_rdev/i_bdev members may be used
1085 * @filp: only f_mode and f_flags may be used
1086 * @cmd: ioctl command number
1087 * @arg: this is third argument given to ioctl(2) system call.
1088 * Often contains a pointer.
1089 *
25985edc 1090 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1091 * success as well). Returns a negated errno value in case of error.
1092 *
1093 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1094 * down in the scsi subsystem.
1da177e4 1095 **/
0338e291 1096static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1097 unsigned int cmd, unsigned long arg)
1098{
1da177e4 1099 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1100 struct scsi_disk *sdkp = scsi_disk(disk);
1101 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1102 void __user *p = (void __user *)arg;
1103 int error;
1104
fe2d1851
NN		 1105 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1106 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1107
0bfc96cb
PB		 1108 error = scsi_verify_blk_ioctl(bdev, cmd);
1109 if (error < 0)
1110 return error;
1111
1da177e4
LT		 1112 /*
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1117 */
83ff6fe8 1118 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1119 (mode & FMODE_NDELAY) != 0);
1da177e4 1120 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1121 goto out;
1da177e4 1122
1da177e4
LT		 1123 /*
1124 * Send SCSI addressing ioctls directly to mid level, send other
1125 * ioctls to block level and then onto mid level if they can't be
1126 * resolved.
1127 */
1128 switch (cmd) {
1129 case SCSI_IOCTL_GET_IDLUN:
1130 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1131 error = scsi_ioctl(sdp, cmd, p);
1132 break;
1da177e4 1133 default:
577ebb37 1134 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1135 if (error != -ENOTTY)
8a6cfeb6
AB		 1136 break;
1137 error = scsi_ioctl(sdp, cmd, p);
1138 break;
1da177e4 1139 }
8a6cfeb6 1140out:
8a6cfeb6 1141 return error;
1da177e4
LT		 1142}
1143
1144static void set_media_not_present(struct scsi_disk *sdkp)
1145{
2bae0093
TH		 1146 if (sdkp->media_present)
1147 sdkp->device->changed = 1;
1148
1149 if (sdkp->device->removable) {
1150 sdkp->media_present = 0;
1151 sdkp->capacity = 0;
1152 }
1153}
1154
1155static int media_not_present(struct scsi_disk *sdkp,
1156 struct scsi_sense_hdr *sshdr)
1157{
1158 if (!scsi_sense_valid(sshdr))
1159 return 0;
1160
1161 /* not invoked for commands that could return deferred errors */
1162 switch (sshdr->sense_key) {
1163 case UNIT_ATTENTION:
1164 case NOT_READY:
1165 /* medium not present */
1166 if (sshdr->asc == 0x3A) {
1167 set_media_not_present(sdkp);
1168 return 1;
1169 }
1170 }
1171 return 0;
1da177e4
LT		 1172}
1173
1174/**
2bae0093
TH		 1175 * sd_check_events - check media events
1176 * @disk: kernel device descriptor
1177 * @clearing: disk events currently being cleared
1da177e4 1178 *
2bae0093 1179 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1180 *
1181 * Note: this function is invoked from the block subsystem.
1182 **/
2bae0093 1183static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1184{
1185 struct scsi_disk *sdkp = scsi_disk(disk);
1186 struct scsi_device *sdp = sdkp->device;
001aac25 1187 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1188 int retval;
1189
2bae0093 1190 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1191
1192 /*
1193 * If the device is offline, don't send any commands - just pretend as
1194 * if the command failed. If the device ever comes back online, we
1195 * can deal with it then. It is only because of unrecoverable errors
1196 * that we would ever take a device offline in the first place.
1197 */
285e9670
KS		 1198 if (!scsi_device_online(sdp)) {
1199 set_media_not_present(sdkp);
285e9670
KS		 1200 goto out;
1201 }
1da177e4
LT		 1202
1203 /*
1204 * Using TEST_UNIT_READY enables differentiation between drive with
1205 * no cartridge loaded - NOT READY, drive with changed cartridge -
1206 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1207 *
1208 * Drives that auto spin down. eg iomega jaz 1G, will be started
1209 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1210 * sd_revalidate() is called.
1211 */
1212 retval = -ENODEV;
285e9670 1213
001aac25 1214 if (scsi_block_when_processing_errors(sdp)) {
4e2247b2
LT		 1215 retval = scsi_autopm_get_device(sdp);
1216 if (retval)
1217 goto out;
1218
001aac25
JB		 1219 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1220 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1221 sshdr);
4e2247b2 1222 scsi_autopm_put_device(sdp);
001aac25 1223 }
1da177e4 1224
2bae0093
TH		 1225 /* failed to execute TUR, assume media not present */
1226 if (host_byte(retval)) {
285e9670 1227 set_media_not_present(sdkp);
285e9670
KS		 1228 goto out;
1229 }
1da177e4 1230
2bae0093
TH		 1231 if (media_not_present(sdkp, sshdr))
1232 goto out;
1233
1da177e4
LT		 1234 /*
1235 * For removable scsi disk we have to recognise the presence
2bae0093 1236 * of a disk in the drive.
1da177e4 1237 */
2bae0093
TH		 1238 if (!sdkp->media_present)
1239 sdp->changed = 1;
1da177e4 1240 sdkp->media_present = 1;
285e9670 1241out:
3ff5588d 1242 /*
2bae0093 1243 * sdp->changed is set under the following conditions:
3ff5588d 1244 *
2bae0093
TH		 1245 * Medium present state has changed in either direction.
1246 * Device has indicated UNIT_ATTENTION.
3ff5588d 1247 */
001aac25 1248 kfree(sshdr);
2bae0093
TH		 1249 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1250 sdp->changed = 0;
1da177e4 1251 return retval;
1da177e4
LT		 1252}
1253
e73aec82 1254static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1255{
1da177e4 1256 int retries, res;
e73aec82 1257 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1258 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1259
1260 if (!scsi_device_online(sdp))
1261 return -ENODEV;
1262
1da177e4 1263
1da177e4
LT		 1264 for (retries = 3; retries > 0; --retries) {
1265 unsigned char cmd[10] = { 0 };
1266
1267 cmd[0] = SYNCHRONIZE_CACHE;
1268 /*
1269 * Leave the rest of the command zero to indicate
1270 * flush everything.
1271 */
ea73a9f2 1272 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e3b3e624 1273 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
ea73a9f2 1274 if (res == 0)
1da177e4
LT		 1275 break;
1276 }
1277
e73aec82
MP		 1278 if (res) {
1279 sd_print_result(sdkp, res);
1280 if (driver_byte(res) & DRIVER_SENSE)
1281 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1282 }
1283
3721050a
TH		 1284 if (res)
1285 return -EIO;
1286 return 0;
1da177e4
LT		 1287}
1288
1da177e4
LT		 1289static void sd_rescan(struct device *dev)
1290{
39b7f1e2
AS		 1291 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1292
1293 if (sdkp) {
f98a8cae 1294 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1295 scsi_disk_put(sdkp);
1296 }
1da177e4
LT		 1297}
1298
1299
1300#ifdef CONFIG_COMPAT
1301/*
1302 * This gets directly called from VFS. When the ioctl
1303 * is not recognized we go back to the other translation paths.
1304 */
0338e291
AV		 1305static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1306 unsigned int cmd, unsigned long arg)
1da177e4 1307{
0338e291 1308 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1309 int ret;
1310
1311 ret = scsi_verify_blk_ioctl(bdev, cmd);
1312 if (ret < 0)
1313 return ret;
1da177e4
LT		 1314
1315 /*
1316 * If we are in the middle of error recovery, don't let anyone
1317 * else try and use this device. Also, if error recovery fails, it
1318 * may try and take the device offline, in which case all further
1319 * access to the device is prohibited.
1320 */
1321 if (!scsi_block_when_processing_errors(sdev))
1322 return -ENODEV;
1323
1324 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1325 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1326
1327 return ret;
1328 }
1329
1330 /*
1331 * Let the static ioctl translation table take care of it.
1332 */
1333 return -ENOIOCTLCMD;
1334}
1335#endif
1336
83d5cde4 1337static const struct block_device_operations sd_fops = {
1da177e4 1338 .owner = THIS_MODULE,
0338e291
AV		 1339 .open = sd_open,
1340 .release = sd_release,
8a6cfeb6 1341 .ioctl = sd_ioctl,
a885c8c4 1342 .getgeo = sd_getgeo,
1da177e4 1343#ifdef CONFIG_COMPAT
0338e291 1344 .compat_ioctl = sd_compat_ioctl,
1da177e4 1345#endif
2bae0093 1346 .check_events = sd_check_events,
1da177e4 1347 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1348 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1349};
1350
18a4d0a2
MP		 1351/**
1352 * sd_eh_action - error handling callback
1353 * @scmd: sd-issued command that has failed
1354 * @eh_cmnd: The command that was sent during error handling
1355 * @eh_cmnd_len: Length of eh_cmnd in bytes
1356 * @eh_disp: The recovery disposition suggested by the midlayer
1357 *
1358 * This function is called by the SCSI midlayer upon completion of
1359 * an error handling command (TEST UNIT READY, START STOP UNIT,
1360 * etc.) The command sent to the device by the error handler is
1361 * stored in eh_cmnd. The result of sending the eh command is
1362 * passed in eh_disp.
1363 **/
1364static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1365 int eh_cmnd_len, int eh_disp)
1366{
1367 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1368
1369 if (!scsi_device_online(scmd->device) ||
1370 !scsi_medium_access_command(scmd))
1371 return eh_disp;
1372
1373 /*
1374 * The device has timed out executing a medium access command.
1375 * However, the TEST UNIT READY command sent during error
1376 * handling completed successfully. Either the device is in the
1377 * process of recovering or has it suffered an internal failure
1378 * that prevents access to the storage medium.
1379 */
1380 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1381 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1382 sdkp->medium_access_timed_out++;
1383
1384 /*
1385 * If the device keeps failing read/write commands but TEST UNIT
1386 * READY always completes successfully we assume that medium
1387 * access is no longer possible and take the device offline.
1388 */
1389 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1390 scmd_printk(KERN_ERR, scmd,
1391 "Medium access timeout failure. Offlining disk!\n");
1392 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1393
1394 return FAILED;
1395 }
1396
1397 return eh_disp;
1398}
1399
af55ff67
MP		 1400static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1401{
83096ebf
TH		 1402 u64 start_lba = blk_rq_pos(scmd->request);
1403 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1404 u64 bad_lba;
1405 int info_valid;
a8733c7b
JB		 1406 /*
1407 * resid is optional but mostly filled in. When it's unused,
1408 * its value is zero, so we assume the whole buffer transferred
1409 */
1410 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1411 unsigned int good_bytes;
af55ff67 1412
33659ebb 1413 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1414 return 0;
1415
1416 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1417 SCSI_SENSE_BUFFERSIZE,
1418 &bad_lba);
1419 if (!info_valid)
1420 return 0;
1421
1422 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1423 return 0;
1424
1425 if (scmd->device->sector_size < 512) {
1426 /* only legitimate sector_size here is 256 */
1427 start_lba <<= 1;
1428 end_lba <<= 1;
1429 } else {
1430 /* be careful ... don't want any overflows */
1431 u64 factor = scmd->device->sector_size / 512;
1432 do_div(start_lba, factor);
1433 do_div(end_lba, factor);
1434 }
1435
1436 /* The bad lba was reported incorrectly, we have no idea where
1437 * the error is.
1438 */
1439 if (bad_lba < start_lba || bad_lba >= end_lba)
1440 return 0;
1441
1442 /* This computation should always be done in terms of
1443 * the resolution of the device's medium.
1444 */
a8733c7b
JB		 1445 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1446 return min(good_bytes, transferred);
af55ff67
MP		 1447}
1448
1da177e4 1449/**
7b3d9545 1450 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1451 * driver has completed (successfully or otherwise) a scsi command.
1452 * @SCpnt: mid-level's per command structure.
1453 *
1454 * Note: potentially run from within an ISR. Must not block.
1455 **/
7b3d9545 1456static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1457{
1458 int result = SCpnt->result;
af55ff67 1459 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1460 struct scsi_sense_hdr sshdr;
4e7392ec 1461 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1da177e4
LT		 1462 int sense_valid = 0;
1463 int sense_deferred = 0;
c98a0eb0 1464 unsigned char op = SCpnt->cmnd[0];
1da177e4 1465
c98a0eb0
MP		 1466 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1467 scsi_set_resid(SCpnt, 0);
6a32a8ae 1468
1da177e4
LT		 1469 if (result) {
1470 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1471 if (sense_valid)
1472 sense_deferred = scsi_sense_is_deferred(&sshdr);
1473 }
1da177e4 1474#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1475 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1476 if (sense_valid) {
fa0d34be 1477 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1478 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1479 "ascq]=%x,%x,%x,%x\n",
1480 sshdr.response_code,
1481 sshdr.sense_key, sshdr.asc,
1482 sshdr.ascq));
1da177e4
LT		 1483 }
1484#endif
03aba2f7
LT		 1485 if (driver_byte(result) != DRIVER_SENSE &&
1486 (!sense_valid || sense_deferred))
1487 goto out;
1488
18a4d0a2
MP		 1489 sdkp->medium_access_timed_out = 0;
1490
03aba2f7
LT		 1491 switch (sshdr.sense_key) {
1492 case HARDWARE_ERROR:
1493 case MEDIUM_ERROR:
af55ff67 1494 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1495 break;
1496 case RECOVERED_ERROR:
af55ff67
MP		 1497 good_bytes = scsi_bufflen(SCpnt);
1498 break;
10dab226
JW		 1499 case NO_SENSE:
1500 /* This indicates a false check condition, so ignore it. An
1501 * unknown amount of data was transferred so treat it as an
1502 * error.
1503 */
1504 scsi_print_sense("sd", SCpnt);
1505 SCpnt->result = 0;
1506 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1507 break;
c98a0eb0
MP		 1508 case ABORTED_COMMAND:
1509 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1510 good_bytes = sd_completed_bytes(SCpnt);
1511 break;
1512 case ILLEGAL_REQUEST:
1513 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1514 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0
MP		 1515 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1516 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1517 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1518 sd_config_discard(sdkp, SD_LBP_DISABLE);
03aba2f7
LT		 1519 break;
1520 default:
1521 break;
1da177e4 1522 }
03aba2f7 1523 out:
af55ff67
MP		 1524 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1525 sd_dif_complete(SCpnt, good_bytes);
1526
4e7392ec 1527 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1528 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1529
1530 /* We have to print a failed command here as the
1531 * extended CDB gets freed before scsi_io_completion()
1532 * is called.
1533 */
1534 if (result)
1535 scsi_print_command(SCpnt);
1536
4e7392ec 1537 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1538 SCpnt->cmnd = NULL;
1539 SCpnt->cmd_len = 0;
1540 }
4e7392ec 1541
7b3d9545 1542 return good_bytes;
1da177e4
LT		 1543}
1544
1da177e4
LT		 1545/*
1546 * spinup disk - called only in sd_revalidate_disk()
1547 */
1548static void
e73aec82 1549sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1550{
1da177e4 1551 unsigned char cmd[10];
4451e472 1552 unsigned long spintime_expire = 0;
1da177e4
LT		 1553 int retries, spintime;
1554 unsigned int the_result;
1555 struct scsi_sense_hdr sshdr;
1556 int sense_valid = 0;
1557
1558 spintime = 0;
1559
1560 /* Spin up drives, as required. Only do this at boot time */
1561 /* Spinup needs to be done for module loads too. */
1562 do {
1563 retries = 0;
1564
1565 do {
1566 cmd[0] = TEST_UNIT_READY;
1567 memset((void *) &cmd[1], 0, 9);
1568
ea73a9f2
JB		 1569 the_result = scsi_execute_req(sdkp->device, cmd,
1570 DMA_NONE, NULL, 0,
1571 &sshdr, SD_TIMEOUT,
f4f4e47e 1572 SD_MAX_RETRIES, NULL);
1da177e4 1573
b4d38e38
AS		 1574 /*
1575 * If the drive has indicated to us that it
1576 * doesn't have any media in it, don't bother
1577 * with any more polling.
1578 */
1579 if (media_not_present(sdkp, &sshdr))
1580 return;
1581
1da177e4 1582 if (the_result)
ea73a9f2 1583 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1584 retries++;
1585 } while (retries < 3 &&
1586 (!scsi_status_is_good(the_result) ||
1587 ((driver_byte(the_result) & DRIVER_SENSE) &&
1588 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1589
1da177e4
LT		 1590 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1591 /* no sense, TUR either succeeded or failed
1592 * with a status error */
e73aec82
MP		 1593 if(!spintime && !scsi_status_is_good(the_result)) {
1594 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1595 sd_print_result(sdkp, the_result);
1596 }
1da177e4
LT		 1597 break;
1598 }
1599
1600 /*
1601 * The device does not want the automatic start to be issued.
1602 */
33dd6f92 1603 if (sdkp->device->no_start_on_add)
1da177e4 1604 break;
1da177e4 1605
33dd6f92
MW		 1606 if (sense_valid && sshdr.sense_key == NOT_READY) {
1607 if (sshdr.asc == 4 && sshdr.ascq == 3)
1608 break; /* manual intervention required */
1609 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1610 break; /* standby */
1611 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1612 break; /* unavailable */
1613 /*
1614 * Issue command to spin up drive when not ready
1615 */
1da177e4 1616 if (!spintime) {
e73aec82 1617 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1618 cmd[0] = START_STOP;
1619 cmd[1] = 1; /* Return immediately */
1620 memset((void *) &cmd[2], 0, 8);
1621 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1622 if (sdkp->device->start_stop_pwr_cond)
1623 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1624 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1625 NULL, 0, &sshdr,
f4f4e47e
FT		 1626 SD_TIMEOUT, SD_MAX_RETRIES,
1627 NULL);
4451e472
AS		 1628 spintime_expire = jiffies + 100 * HZ;
1629 spintime = 1;
1da177e4 1630 }
1da177e4
LT		 1631 /* Wait 1 second for next try */
1632 msleep(1000);
1633 printk(".");
4451e472
AS		 1634
1635 /*
1636 * Wait for USB flash devices with slow firmware.
1637 * Yes, this sense key/ASC combination shouldn't
1638 * occur here. It's characteristic of these devices.
1639 */
1640 } else if (sense_valid &&
1641 sshdr.sense_key == UNIT_ATTENTION &&
1642 sshdr.asc == 0x28) {
1643 if (!spintime) {
1644 spintime_expire = jiffies + 5 * HZ;
1645 spintime = 1;
1646 }
1647 /* Wait 1 second for next try */
1648 msleep(1000);
1da177e4
LT		 1649 } else {
1650 /* we don't understand the sense code, so it's
1651 * probably pointless to loop */
1652 if(!spintime) {
e73aec82
MP		 1653 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1654 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1655 }
1656 break;
1657 }
1658
4451e472 1659 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1660
1661 if (spintime) {
1662 if (scsi_status_is_good(the_result))
1663 printk("ready\n");
1664 else
1665 printk("not responding...\n");
1666 }
1667}
1668
e0597d70
MP		 1669
1670/*
1671 * Determine whether disk supports Data Integrity Field.
1672 */
439d77f7 1673static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1674{
1675 struct scsi_device *sdp = sdkp->device;
1676 u8 type;
1677
1678 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
35e1a5d9
MP		 1679 return;
1680
1681 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1682
1683 if (type == sdkp->protection_type || !sdkp->first_scan)
1684 return;
e0597d70 1685
be922f47
MP		 1686 sdkp->protection_type = type;
1687
4e7392ec 1688 if (type > SD_DIF_TYPE3_PROTECTION) {
35e1a5d9
MP		 1689 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1690 "protection type %u. Disabling disk!\n", type);
1691 sdkp->capacity = 0;
1692 return;
e0597d70
MP		 1693 }
1694
35e1a5d9
MP		 1695 if (scsi_host_dif_capable(sdp->host, type))
1696 sd_printk(KERN_NOTICE, sdkp,
1697 "Enabling DIF Type %u protection\n", type);
1698 else
1699 sd_printk(KERN_NOTICE, sdkp,
1700 "Disabling DIF Type %u protection\n", type);
e0597d70
MP		 1701}
1702
0da205e0
MW		 1703static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1704 struct scsi_sense_hdr *sshdr, int sense_valid,
1705 int the_result)
1706{
1707 sd_print_result(sdkp, the_result);
1708 if (driver_byte(the_result) & DRIVER_SENSE)
1709 sd_print_sense_hdr(sdkp, sshdr);
1710 else
1711 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1712
1713 /*
1714 * Set dirty bit for removable devices if not ready -
1715 * sometimes drives will not report this properly.
1716 */
1717 if (sdp->removable &&
1718 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1719 set_media_not_present(sdkp);
0da205e0
MW		 1720
1721 /*
1722 * We used to set media_present to 0 here to indicate no media
1723 * in the drive, but some drives fail read capacity even with
1724 * media present, so we can't do that.
1725 */
1726 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1727}
1728
1729#define RC16_LEN 32
1730#if RC16_LEN > SD_BUF_SIZE
1731#error RC16_LEN must not be more than SD_BUF_SIZE
1732#endif
1733
3233ac19
JB		 1734#define READ_CAPACITY_RETRIES_ON_RESET 10
1735
0da205e0
MW		 1736static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1737 unsigned char *buffer)
ea73a9f2 1738{
1da177e4 1739 unsigned char cmd[16];
1da177e4
LT		 1740 struct scsi_sense_hdr sshdr;
1741 int sense_valid = 0;
0da205e0 1742 int the_result;
3233ac19 1743 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1744 unsigned int alignment;
0da205e0
MW		 1745 unsigned long long lba;
1746 unsigned sector_size;
1da177e4 1747
5ce524bd
HG		 1748 if (sdp->no_read_capacity_16)
1749 return -EINVAL;
1750
1da177e4 1751 do {
0da205e0
MW		 1752 memset(cmd, 0, 16);
1753 cmd[0] = SERVICE_ACTION_IN;
1754 cmd[1] = SAI_READ_CAPACITY_16;
1755 cmd[13] = RC16_LEN;
1756 memset(buffer, 0, RC16_LEN);
1757
ea73a9f2 1758 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1759 buffer, RC16_LEN, &sshdr,
1760 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1761
ea73a9f2 1762 if (media_not_present(sdkp, &sshdr))
0da205e0 1763 return -ENODEV;
1da177e4 1764
2b301307 1765 if (the_result) {
ea73a9f2 1766 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1767 if (sense_valid &&
1768 sshdr.sense_key == ILLEGAL_REQUEST &&
1769 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1770 sshdr.ascq == 0x00)
1771 /* Invalid Command Operation Code or
1772 * Invalid Field in CDB, just retry
1773 * silently with RC10 */
1774 return -EINVAL;
3233ac19
JB		 1775 if (sense_valid &&
1776 sshdr.sense_key == UNIT_ATTENTION &&
1777 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1778 /* Device reset might occur several times,
1779 * give it one more chance */
1780 if (--reset_retries > 0)
1781 continue;
2b301307 1782 }
1da177e4
LT		 1783 retries--;
1784
1785 } while (the_result && retries);
1786
0da205e0 1787 if (the_result) {
e73aec82 1788 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1789 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1790 return -EINVAL;
1791 }
e73aec82 1792
8f76d151
DH		 1793 sector_size = get_unaligned_be32(&buffer[8]);
1794 lba = get_unaligned_be64(&buffer[0]);
0da205e0
MW		 1795
1796 sd_read_protection_type(sdkp, buffer);
1797
1798 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1799 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1800 "kernel compiled with support for large block "
1801 "devices.\n");
1802 sdkp->capacity = 0;
1803 return -EOVERFLOW;
1804 }
1805
ea09bcc9 1806 /* Logical blocks per physical block exponent */
526f7c79 1807 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1808
1809 /* Lowest aligned logical block */
1810 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1811 blk_queue_alignment_offset(sdp->request_queue, alignment);
1812 if (alignment && sdkp->first_scan)
1813 sd_printk(KERN_NOTICE, sdkp,
1814 "physical block alignment offset: %u\n", alignment);
1815
c98a0eb0
MP		 1816 if (buffer[14] & 0x80) { /* LBPME */
1817 sdkp->lbpme = 1;
e339c1a7 1818
c98a0eb0
MP		 1819 if (buffer[14] & 0x40) /* LBPRZ */
1820 sdkp->lbprz = 1;
e339c1a7 1821
c98a0eb0 1822 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 1823 }
1824
0da205e0
MW		 1825 sdkp->capacity = lba + 1;
1826 return sector_size;
1827}
1828
1829static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1830 unsigned char *buffer)
1831{
1832 unsigned char cmd[16];
1833 struct scsi_sense_hdr sshdr;
1834 int sense_valid = 0;
1835 int the_result;
3233ac19 1836 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 1837 sector_t lba;
1838 unsigned sector_size;
1839
1840 do {
1841 cmd[0] = READ_CAPACITY;
1842 memset(&cmd[1], 0, 9);
1843 memset(buffer, 0, 8);
1844
1845 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1846 buffer, 8, &sshdr,
1847 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1848
1849 if (media_not_present(sdkp, &sshdr))
1850 return -ENODEV;
1851
3233ac19 1852 if (the_result) {
0da205e0 1853 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 1854 if (sense_valid &&
1855 sshdr.sense_key == UNIT_ATTENTION &&
1856 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1857 /* Device reset might occur several times,
1858 * give it one more chance */
1859 if (--reset_retries > 0)
1860 continue;
1861 }
0da205e0
MW		 1862 retries--;
1863
1864 } while (the_result && retries);
1865
1866 if (the_result) {
1867 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1868 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1869 return -EINVAL;
1870 }
1871
8f76d151
DH		 1872 sector_size = get_unaligned_be32(&buffer[4]);
1873 lba = get_unaligned_be32(&buffer[0]);
0da205e0 1874
5ce524bd
HG		 1875 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1876 /* Some buggy (usb cardreader) devices return an lba of
1877 0xffffffff when the want to report a size of 0 (with
1878 which they really mean no media is present) */
1879 sdkp->capacity = 0;
5cc10350 1880 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 1881 return sector_size;
1882 }
1883
0da205e0
MW		 1884 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1885 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1886 "kernel compiled with support for large block "
1887 "devices.\n");
1888 sdkp->capacity = 0;
1889 return -EOVERFLOW;
1890 }
1891
1892 sdkp->capacity = lba + 1;
526f7c79 1893 sdkp->physical_block_size = sector_size;
0da205e0
MW		 1894 return sector_size;
1895}
1896
2b301307
MW		 1897static int sd_try_rc16_first(struct scsi_device *sdp)
1898{
f87146bb
HR		 1899 if (sdp->host->max_cmd_len < 16)
1900 return 0;
6a0bdffa
AS		 1901 if (sdp->try_rc_10_first)
1902 return 0;
2b301307
MW		 1903 if (sdp->scsi_level > SCSI_SPC_2)
1904 return 1;
1905 if (scsi_device_protection(sdp))
1906 return 1;
1907 return 0;
1908}
1909
0da205e0
MW		 1910/*
1911 * read disk capacity
1912 */
1913static void
1914sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1915{
1916 int sector_size;
1917 struct scsi_device *sdp = sdkp->device;
70a9b873 1918 sector_t old_capacity = sdkp->capacity;
0da205e0 1919
2b301307 1920 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 1921 sector_size = read_capacity_16(sdkp, sdp, buffer);
1922 if (sector_size == -EOVERFLOW)
1da177e4 1923 goto got_data;
2b301307
MW		 1924 if (sector_size == -ENODEV)
1925 return;
1926 if (sector_size < 0)
1927 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 1928 if (sector_size < 0)
1929 return;
1da177e4 1930 } else {
0da205e0
MW		 1931 sector_size = read_capacity_10(sdkp, sdp, buffer);
1932 if (sector_size == -EOVERFLOW)
1933 goto got_data;
1934 if (sector_size < 0)
1935 return;
1936 if ((sizeof(sdkp->capacity) > 4) &&
1937 (sdkp->capacity > 0xffffffffULL)) {
1938 int old_sector_size = sector_size;
1939 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1940 "Trying to use READ CAPACITY(16).\n");
1941 sector_size = read_capacity_16(sdkp, sdp, buffer);
1942 if (sector_size < 0) {
1943 sd_printk(KERN_NOTICE, sdkp,
1944 "Using 0xffffffff as device size\n");
1945 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1946 sector_size = old_sector_size;
1947 goto got_data;
1948 }
1949 }
1950 }
1da177e4 1951
5c211caa
AS		 1952 /* Some devices are known to return the total number of blocks,
1953 * not the highest block number. Some devices have versions
1954 * which do this and others which do not. Some devices we might
1955 * suspect of doing this but we don't know for certain.
1956 *
1957 * If we know the reported capacity is wrong, decrement it. If
1958 * we can only guess, then assume the number of blocks is even
1959 * (usually true but not always) and err on the side of lowering
1960 * the capacity.
1961 */
1962 if (sdp->fix_capacity ||
1963 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1964 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1965 "from its reported value: %llu\n",
1966 (unsigned long long) sdkp->capacity);
1da177e4 1967 --sdkp->capacity;
61bf54b7
ON		 1968 }
1969
1da177e4
LT		 1970got_data:
1971 if (sector_size == 0) {
1972 sector_size = 512;
e73aec82
MP		 1973 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1974 "assuming 512.\n");
1da177e4
LT		 1975 }
1976
1977 if (sector_size != 512 &&
1978 sector_size != 1024 &&
1979 sector_size != 2048 &&
1980 sector_size != 4096 &&
1981 sector_size != 256) {
e73aec82
MP		 1982 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1983 sector_size);
1da177e4
LT		 1984 /*
1985 * The user might want to re-format the drive with
1986 * a supported sectorsize. Once this happens, it
1987 * would be relatively trivial to set the thing up.
1988 * For this reason, we leave the thing in the table.
1989 */
1990 sdkp->capacity = 0;
1991 /*
1992 * set a bogus sector size so the normal read/write
1993 * logic in the block layer will eventually refuse any
1994 * request on this device without tripping over power
1995 * of two sector size assumptions
1996 */
1997 sector_size = 512;
1998 }
e1defc4f 1999 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2000
1da177e4 2001 {
7404ad3b 2002 char cap_str_2[10], cap_str_10[10];
520a2c27 2003 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2004
7404ad3b
JB		 2005 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2006 sizeof(cap_str_2));
2007 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2008 sizeof(cap_str_10));
1da177e4 2009
ea09bcc9 2010 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2011 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2012 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2013 (unsigned long long)sdkp->capacity,
2014 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2015
526f7c79 2016 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2017 sd_printk(KERN_NOTICE, sdkp,
2018 "%u-byte physical blocks\n",
526f7c79 2019 sdkp->physical_block_size);
ea09bcc9 2020 }
1da177e4
LT		 2021 }
2022
2023 /* Rescale capacity to 512-byte units */
2024 if (sector_size == 4096)
2025 sdkp->capacity <<= 3;
2026 else if (sector_size == 2048)
2027 sdkp->capacity <<= 2;
2028 else if (sector_size == 1024)
2029 sdkp->capacity <<= 1;
2030 else if (sector_size == 256)
2031 sdkp->capacity >>= 1;
2032
526f7c79
MP		 2033 blk_queue_physical_block_size(sdp->request_queue,
2034 sdkp->physical_block_size);
1da177e4
LT		 2035 sdkp->device->sector_size = sector_size;
2036}
2037
2038/* called with buffer of length 512 */
2039static inline int
ea73a9f2
JB		 2040sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2041 unsigned char *buffer, int len, struct scsi_mode_data *data,
2042 struct scsi_sense_hdr *sshdr)
1da177e4 2043{
ea73a9f2 2044 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2045 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2046 sshdr);
1da177e4
LT		 2047}
2048
2049/*
2050 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2051 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2052 */
2053static void
e73aec82 2054sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2055{
1da177e4 2056 int res;
ea73a9f2 2057 struct scsi_device *sdp = sdkp->device;
1da177e4 2058 struct scsi_mode_data data;
70a9b873 2059 int old_wp = sdkp->write_prot;
1da177e4
LT		 2060
2061 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2062 if (sdp->skip_ms_page_3f) {
e73aec82 2063 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2064 return;
2065 }
2066
ea73a9f2
JB		 2067 if (sdp->use_192_bytes_for_3f) {
2068 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2069 } else {
2070 /*
2071 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2072 * We have to start carefully: some devices hang if we ask
2073 * for more than is available.
2074 */
ea73a9f2 2075 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2076
2077 /*
2078 * Second attempt: ask for page 0 When only page 0 is
2079 * implemented, a request for page 3F may return Sense Key
2080 * 5: Illegal Request, Sense Code 24: Invalid field in
2081 * CDB.
2082 */
2083 if (!scsi_status_is_good(res))
ea73a9f2 2084 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2085
2086 /*
2087 * Third attempt: ask 255 bytes, as we did earlier.
2088 */
2089 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2090 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2091 &data, NULL);
1da177e4
LT		 2092 }
2093
2094 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2095 sd_printk(KERN_WARNING, sdkp,
2096 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2097 } else {
2098 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2099 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2100 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2101 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2102 sdkp->write_prot ? "on" : "off");
2103 sd_printk(KERN_DEBUG, sdkp,
2104 "Mode Sense: %02x %02x %02x %02x\n",
2105 buffer[0], buffer[1], buffer[2], buffer[3]);
2106 }
1da177e4
LT		 2107 }
2108}
2109
2110/*
2111 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2112 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2113 */
2114static void
e73aec82 2115sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2116{
1da177e4 2117 int len = 0, res;
ea73a9f2 2118 struct scsi_device *sdp = sdkp->device;
1da177e4 2119
631e8a13
AV		 2120 int dbd;
2121 int modepage;
0bcaa111 2122 int first_len;
1da177e4
LT		 2123 struct scsi_mode_data data;
2124 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2125 int old_wce = sdkp->WCE;
2126 int old_rcd = sdkp->RCD;
2127 int old_dpofua = sdkp->DPOFUA;
1da177e4 2128
0bcaa111
LT		 2129 first_len = 4;
2130 if (sdp->skip_ms_page_8) {
2131 if (sdp->type == TYPE_RBC)
2132 goto defaults;
2133 else {
2134 if (sdp->skip_ms_page_3f)
2135 goto defaults;
2136 modepage = 0x3F;
2137 if (sdp->use_192_bytes_for_3f)
2138 first_len = 192;
2139 dbd = 0;
2140 }
2141 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2142 modepage = 6;
2143 dbd = 8;
2144 } else {
2145 modepage = 8;
2146 dbd = 0;
2147 }
2148
1da177e4 2149 /* cautiously ask */
0bcaa111
LT		 2150 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2151 &data, &sshdr);
1da177e4
LT		 2152
2153 if (!scsi_status_is_good(res))
2154 goto bad_sense;
2155
6d73c851
AV		 2156 if (!data.header_length) {
2157 modepage = 6;
0bcaa111 2158 first_len = 0;
e73aec82 2159 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2160 }
2161
1da177e4
LT		 2162 /* that went OK, now ask for the proper length */
2163 len = data.length;
2164
2165 /*
2166 * We're only interested in the first three bytes, actually.
2167 * But the data cache page is defined for the first 20.
2168 */
2169 if (len < 3)
2170 goto bad_sense;
0bcaa111
LT		 2171 else if (len > SD_BUF_SIZE) {
2172 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2173 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2174 len = SD_BUF_SIZE;
2175 }
2176 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2177 len = 192;
1da177e4
LT		 2178
2179 /* Get the data */
0bcaa111
LT		 2180 if (len > first_len)
2181 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2182 &data, &sshdr);
1da177e4
LT		 2183
2184 if (scsi_status_is_good(res)) {
631e8a13 2185 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2186
0bcaa111
LT		 2187 while (offset < len) {
2188 u8 page_code = buffer[offset] & 0x3F;
2189 u8 spf = buffer[offset] & 0x40;
2190
2191 if (page_code == 8 || page_code == 6) {
2192 /* We're interested only in the first 3 bytes.
2193 */
2194 if (len - offset <= 2) {
2195 sd_printk(KERN_ERR, sdkp, "Incomplete "
2196 "mode parameter data\n");
2197 goto defaults;
2198 } else {
2199 modepage = page_code;
2200 goto Page_found;
2201 }
2202 } else {
2203 /* Go to the next page */
2204 if (spf && len - offset > 3)
2205 offset += 4 + (buffer[offset+2] << 8) +
2206 buffer[offset+3];
2207 else if (!spf && len - offset > 1)
2208 offset += 2 + buffer[offset+1];
2209 else {
2210 sd_printk(KERN_ERR, sdkp, "Incomplete "
2211 "mode parameter data\n");
2212 goto defaults;
2213 }
2214 }
48970800
AV		 2215 }
2216
0bcaa111
LT		 2217 if (modepage == 0x3F) {
2218 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2219 "present\n");
2220 goto defaults;
2221 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2222 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2223 goto defaults;
2224 }
0bcaa111 2225 Page_found:
631e8a13
AV		 2226 if (modepage == 8) {
2227 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2228 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2229 } else {
2230 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2231 sdkp->RCD = 0;
2232 }
1da177e4 2233
007365ad
TH		 2234 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2235 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2236 sd_printk(KERN_NOTICE, sdkp,
2237 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2238 sdkp->DPOFUA = 0;
2239 }
2240
70a9b873
MP		 2241 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2242 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2243 sd_printk(KERN_NOTICE, sdkp,
2244 "Write cache: %s, read cache: %s, %s\n",
2245 sdkp->WCE ? "enabled" : "disabled",
2246 sdkp->RCD ? "disabled" : "enabled",
2247 sdkp->DPOFUA ? "supports DPO and FUA"
2248 : "doesn't support DPO or FUA");
1da177e4
LT		 2249
2250 return;
2251 }
2252
2253bad_sense:
ea73a9f2 2254 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2255 sshdr.sense_key == ILLEGAL_REQUEST &&
2256 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2257 /* Invalid field in CDB */
2258 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2259 else
e73aec82 2260 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2261
2262defaults:
b81478d8
NJ		 2263 if (sdp->wce_default_on) {
2264 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2265 sdkp->WCE = 1;
2266 } else {
2267 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2268 sdkp->WCE = 0;
2269 }
1da177e4 2270 sdkp->RCD = 0;
48970800 2271 sdkp->DPOFUA = 0;
1da177e4
LT		 2272}
2273
e0597d70
MP		 2274/*
2275 * The ATO bit indicates whether the DIF application tag is available
2276 * for use by the operating system.
2277 */
439d77f7 2278static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2279{
2280 int res, offset;
2281 struct scsi_device *sdp = sdkp->device;
2282 struct scsi_mode_data data;
2283 struct scsi_sense_hdr sshdr;
2284
2285 if (sdp->type != TYPE_DISK)
2286 return;
2287
2288 if (sdkp->protection_type == 0)
2289 return;
2290
2291 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2292 SD_MAX_RETRIES, &data, &sshdr);
2293
2294 if (!scsi_status_is_good(res) || !data.header_length ||
2295 data.length < 6) {
2296 sd_printk(KERN_WARNING, sdkp,
2297 "getting Control mode page failed, assume no ATO\n");
2298
2299 if (scsi_sense_valid(&sshdr))
2300 sd_print_sense_hdr(sdkp, &sshdr);
2301
2302 return;
2303 }
2304
2305 offset = data.header_length + data.block_descriptor_length;
2306
2307 if ((buffer[offset] & 0x3f) != 0x0a) {
2308 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2309 return;
2310 }
2311
2312 if ((buffer[offset + 5] & 0x80) == 0)
2313 return;
2314
2315 sdkp->ATO = 1;
2316
2317 return;
2318}
2319
d11b6916
MP		 2320/**
2321 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2322 * @disk: disk to query
2323 */
2324static void sd_read_block_limits(struct scsi_disk *sdkp)
2325{
2326 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2327 const int vpd_len = 64;
e3deec09 2328 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2329
e3deec09
JB		 2330 if (!buffer ||
2331 /* Block Limits VPD */
2332 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2333 goto out;
d11b6916
MP		 2334
2335 blk_queue_io_min(sdkp->disk->queue,
2336 get_unaligned_be16(&buffer[6]) * sector_sz);
2337 blk_queue_io_opt(sdkp->disk->queue,
2338 get_unaligned_be32(&buffer[12]) * sector_sz);
2339
c98a0eb0
MP		 2340 if (buffer[3] == 0x3c) {
2341 unsigned int lba_count, desc_count;
e339c1a7 2342
c98a0eb0
MP		 2343 sdkp->max_ws_blocks =
2344 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2345 (u64)0xffffffff);
e339c1a7 2346
c98a0eb0 2347 if (!sdkp->lbpme)
045d3fe7 2348 goto out;
045d3fe7 2349
c98a0eb0
MP		 2350 lba_count = get_unaligned_be32(&buffer[20]);
2351 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2352
c98a0eb0
MP		 2353 if (lba_count && desc_count)
2354 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2355
c98a0eb0 2356 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2357
2358 if (buffer[32] & 0x80)
c98a0eb0 2359 sdkp->unmap_alignment =
e339c1a7 2360 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2361
2362 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2363
2364 if (sdkp->max_unmap_blocks)
2365 sd_config_discard(sdkp, SD_LBP_UNMAP);
2366 else
2367 sd_config_discard(sdkp, SD_LBP_WS16);
2368
2369 } else { /* LBP VPD page tells us what to use */
2370
2371 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2372 sd_config_discard(sdkp, SD_LBP_UNMAP);
2373 else if (sdkp->lbpws)
2374 sd_config_discard(sdkp, SD_LBP_WS16);
2375 else if (sdkp->lbpws10)
2376 sd_config_discard(sdkp, SD_LBP_WS10);
2377 else
2378 sd_config_discard(sdkp, SD_LBP_DISABLE);
2379 }
e339c1a7
MP		 2380 }
2381
e3deec09 2382 out:
d11b6916
MP		 2383 kfree(buffer);
2384}
2385
3821d768
MP		 2386/**
2387 * sd_read_block_characteristics - Query block dev. characteristics
2388 * @disk: disk to query
2389 */
2390static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2391{
e3deec09 2392 unsigned char *buffer;
3821d768 2393 u16 rot;
bb2d3de1 2394 const int vpd_len = 64;
3821d768 2395
e3deec09 2396 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2397
e3deec09
JB		 2398 if (!buffer ||
2399 /* Block Device Characteristics VPD */
2400 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2401 goto out;
3821d768
MP		 2402
2403 rot = get_unaligned_be16(&buffer[4]);
2404
2405 if (rot == 1)
2406 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2407
e3deec09 2408 out:
3821d768
MP		 2409 kfree(buffer);
2410}
2411
045d3fe7 2412/**
c98a0eb0 2413 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2414 * @disk: disk to query
2415 */
c98a0eb0 2416static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2417{
2418 unsigned char *buffer;
2419 const int vpd_len = 8;
2420
c98a0eb0 2421 if (sdkp->lbpme == 0)
045d3fe7
MP		 2422 return;
2423
2424 buffer = kmalloc(vpd_len, GFP_KERNEL);
2425
2426 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2427 goto out;
2428
c98a0eb0
MP		 2429 sdkp->lbpvpd = 1;
2430 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2431 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2432 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2433
2434 out:
2435 kfree(buffer);
2436}
2437
ffd4bc2a
MP		 2438static int sd_try_extended_inquiry(struct scsi_device *sdp)
2439{
2440 /*
2441 * Although VPD inquiries can go to SCSI-2 type devices,
2442 * some USB ones crash on receiving them, and the pages
2443 * we currently ask for are for SPC-3 and beyond
2444 */
09b6b51b 2445 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2446 return 1;
2447 return 0;
2448}
2449
1da177e4
LT		 2450/**
2451 * sd_revalidate_disk - called the first time a new disk is seen,
2452 * performs disk spin up, read_capacity, etc.
2453 * @disk: struct gendisk we care about
2454 **/
2455static int sd_revalidate_disk(struct gendisk *disk)
2456{
2457 struct scsi_disk *sdkp = scsi_disk(disk);
2458 struct scsi_device *sdp = sdkp->device;
1da177e4 2459 unsigned char *buffer;
4913efe4 2460 unsigned flush = 0;
1da177e4 2461
fa0d34be
MP		 2462 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2463 "sd_revalidate_disk\n"));
1da177e4
LT		 2464
2465 /*
2466 * If the device is offline, don't try and read capacity or any
2467 * of the other niceties.
2468 */
2469 if (!scsi_device_online(sdp))
2470 goto out;
2471
a6123f14 2472 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2473 if (!buffer) {
e73aec82
MP		 2474 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2475 "allocation failure.\n");
ea73a9f2 2476 goto out;
1da177e4
LT		 2477 }
2478
e73aec82 2479 sd_spinup_disk(sdkp);
1da177e4
LT		 2480
2481 /*
2482 * Without media there is no reason to ask; moreover, some devices
2483 * react badly if we do.
2484 */
2485 if (sdkp->media_present) {
e73aec82 2486 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2487
2488 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2489 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2490 sd_read_block_limits(sdkp);
2491 sd_read_block_characteristics(sdkp);
2492 }
2493
e73aec82
MP		 2494 sd_read_write_protect_flag(sdkp, buffer);
2495 sd_read_cache_type(sdkp, buffer);
e0597d70 2496 sd_read_app_tag_own(sdkp, buffer);
1da177e4 2497 }
461d4e90 2498
70a9b873
MP		 2499 sdkp->first_scan = 0;
2500
461d4e90
TH		 2501 /*
2502 * We now have all cache related info, determine how we deal
4913efe4 2503 * with flush requests.
461d4e90 2504 */
4913efe4
TH		 2505 if (sdkp->WCE) {
2506 flush |= REQ_FLUSH;
2507 if (sdkp->DPOFUA)
2508 flush |= REQ_FUA;
2509 }
461d4e90 2510
4913efe4 2511 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2512
1da177e4
LT		 2513 set_capacity(disk, sdkp->capacity);
2514 kfree(buffer);
2515
1da177e4
LT		 2516 out:
2517 return 0;
2518}
2519
72ec24bd
TH		 2520/**
2521 * sd_unlock_native_capacity - unlock native capacity
2522 * @disk: struct gendisk to set capacity for
2523 *
2524 * Block layer calls this function if it detects that partitions
2525 * on @disk reach beyond the end of the device. If the SCSI host
2526 * implements ->unlock_native_capacity() method, it's invoked to
2527 * give it a chance to adjust the device capacity.
2528 *
2529 * CONTEXT:
2530 * Defined by block layer. Might sleep.
2531 */
2532static void sd_unlock_native_capacity(struct gendisk *disk)
2533{
2534 struct scsi_device *sdev = scsi_disk(disk)->device;
2535
2536 if (sdev->host->hostt->unlock_native_capacity)
2537 sdev->host->hostt->unlock_native_capacity(sdev);
2538}
2539
3e1a7ff8
TH		 2540/**
2541 * sd_format_disk_name - format disk name
2542 * @prefix: name prefix - ie. "sd" for SCSI disks
2543 * @index: index of the disk to format name for
2544 * @buf: output buffer
2545 * @buflen: length of the output buffer
2546 *
2547 * SCSI disk names starts at sda. The 26th device is sdz and the
2548 * 27th is sdaa. The last one for two lettered suffix is sdzz
2549 * which is followed by sdaaa.
2550 *
2551 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2552 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2553 * determined using similar method as 26 base conversion with the
2554 * index shifted -1 after each digit is computed.
2555 *
2556 * CONTEXT:
2557 * Don't care.
2558 *
2559 * RETURNS:
2560 * 0 on success, -errno on failure.
2561 */
2562static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2563{
2564 const int base = 'z' - 'a' + 1;
2565 char *begin = buf + strlen(prefix);
2566 char *end = buf + buflen;
2567 char *p;
2568 int unit;
2569
2570 p = end - 1;
2571 *p = '\0';
2572 unit = base;
2573 do {
2574 if (p == begin)
2575 return -EINVAL;
2576 *--p = 'a' + (index % unit);
2577 index = (index / unit) - 1;
2578 } while (index >= 0);
2579
2580 memmove(begin, p, end - p);
2581 memcpy(buf, prefix, strlen(prefix));
2582
2583 return 0;
2584}
2585
4ace92fc
AV		 2586/*
2587 * The asynchronous part of sd_probe
2588 */
2589static void sd_probe_async(void *data, async_cookie_t cookie)
2590{
2591 struct scsi_disk *sdkp = data;
2592 struct scsi_device *sdp;
2593 struct gendisk *gd;
2594 u32 index;
2595 struct device *dev;
2596
2597 sdp = sdkp->device;
2598 gd = sdkp->disk;
2599 index = sdkp->index;
2600 dev = &sdp->sdev_gendev;
2601
1a03ae0f
MR		 2602 gd->major = sd_major((index & 0xf0) >> 4);
2603 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2604 gd->minors = SD_MINORS;
2605
4ace92fc
AV		 2606 gd->fops = &sd_fops;
2607 gd->private_data = &sdkp->driver;
2608 gd->queue = sdkp->device->request_queue;
2609
70a9b873
MP		 2610 /* defaults, until the device tells us otherwise */
2611 sdp->sector_size = 512;
2612 sdkp->capacity = 0;
2613 sdkp->media_present = 1;
2614 sdkp->write_prot = 0;
2615 sdkp->WCE = 0;
2616 sdkp->RCD = 0;
2617 sdkp->ATO = 0;
2618 sdkp->first_scan = 1;
18a4d0a2 2619 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2620
4ace92fc
AV		 2621 sd_revalidate_disk(gd);
2622
2623 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2624 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2625
2626 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2627 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2628 if (sdp->removable) {
4ace92fc 2629 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2630 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2631 }
4ace92fc 2632
4ace92fc
AV		 2633 add_disk(gd);
2634 sd_dif_config_host(sdkp);
2635
3821d768
MP		 2636 sd_revalidate_disk(gd);
2637
4ace92fc
AV		 2638 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2639 sdp->removable ? "removable " : "");
478a8a05 2640 scsi_autopm_put_device(sdp);
ea038f63 2641 put_device(&sdkp->dev);
4ace92fc
AV		 2642}
2643
1da177e4
LT		 2644/**
2645 * sd_probe - called during driver initialization and whenever a
2646 * new scsi device is attached to the system. It is called once
2647 * for each scsi device (not just disks) present.
2648 * @dev: pointer to device object
2649 *
2650 * Returns 0 if successful (or not interested in this scsi device
2651 * (e.g. scanner)); 1 when there is an error.
2652 *
2653 * Note: this function is invoked from the scsi mid-level.
2654 * This function sets up the mapping between a given
2655 * <host,channel,id,lun> (found in sdp) and new device name
2656 * (e.g. /dev/sda). More precisely it is the block device major
2657 * and minor number that is chosen here.
2658 *
2db93ce8
PU		 2659 * Assume sd_probe is not re-entrant (for time being)
2660 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2661 **/
2662static int sd_probe(struct device *dev)
2663{
2664 struct scsi_device *sdp = to_scsi_device(dev);
2665 struct scsi_disk *sdkp;
2666 struct gendisk *gd;
439d77f7 2667 int index;
1da177e4
LT		 2668 int error;
2669
2670 error = -ENODEV;
631e8a13 2671 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2672 goto out;
2673
9ccfc756 2674 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2675 "sd_probe\n"));
1da177e4
LT		 2676
2677 error = -ENOMEM;
24669f75 2678 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2679 if (!sdkp)
2680 goto out;
2681
689d6fac 2682 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2683 if (!gd)
2684 goto out_free;
2685
f27bac27
TH		 2686 do {
2687 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2688 goto out_put;
1da177e4 2689
4034cc68 2690 spin_lock(&sd_index_lock);
f27bac27 2691 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2692 spin_unlock(&sd_index_lock);
f27bac27 2693 } while (error == -EAGAIN);
1da177e4 2694
21208ae5
DK		 2695 if (error) {
2696 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2697 goto out_put;
1a03ae0f
MR		 2698 }
2699
3e1a7ff8 2700 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2701 if (error) {
2702 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2703 goto out_free_index;
21208ae5 2704 }
f27bac27 2705
1da177e4
LT		 2706 sdkp->device = sdp;
2707 sdkp->driver = &sd_template;
2708 sdkp->disk = gd;
2709 sdkp->index = index;
409f3499 2710 atomic_set(&sdkp->openers, 0);
9e1a1537 2711 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2712
601e7638
JB		 2713 if (!sdp->request_queue->rq_timeout) {
2714 if (sdp->type != TYPE_MOD)
2715 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2716 else
2717 blk_queue_rq_timeout(sdp->request_queue,
2718 SD_MOD_TIMEOUT);
2719 }
2720
2721 device_initialize(&sdkp->dev);
478a8a05 2722 sdkp->dev.parent = dev;
601e7638 2723 sdkp->dev.class = &sd_disk_class;
478a8a05 2724 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2725
2726 if (device_add(&sdkp->dev))
2727 goto out_free_index;
2728
478a8a05
AS		 2729 get_device(dev);
2730 dev_set_drvdata(dev, sdkp);
601e7638 2731
ea038f63 2732 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2733 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2734
2735 return 0;
2736
f27bac27 2737 out_free_index:
4034cc68 2738 spin_lock(&sd_index_lock);
f27bac27 2739 ida_remove(&sd_index_ida, index);
4034cc68 2740 spin_unlock(&sd_index_lock);
6bdaa1f1 2741 out_put:
1da177e4 2742 put_disk(gd);
6bdaa1f1 2743 out_free:
1da177e4 2744 kfree(sdkp);
6bdaa1f1 2745 out:
1da177e4
LT		 2746 return error;
2747}
2748
2749/**
2750 * sd_remove - called whenever a scsi disk (previously recognized by
2751 * sd_probe) is detached from the system. It is called (potentially
2752 * multiple times) during sd module unload.
2753 * @sdp: pointer to mid level scsi device object
2754 *
2755 * Note: this function is invoked from the scsi mid-level.
2756 * This function potentially frees up a device name (e.g. /dev/sdc)
2757 * that could be re-used by a subsequent sd_probe().
2758 * This function is not called when the built-in sd driver is "exit-ed".
2759 **/
2760static int sd_remove(struct device *dev)
2761{
601e7638 2762 struct scsi_disk *sdkp;
1da177e4 2763
601e7638 2764 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2765 scsi_autopm_get_device(sdkp->device);
2766
a7a20d10 2767 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2768 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2769 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2770 device_del(&sdkp->dev);
1da177e4
LT		 2771 del_gendisk(sdkp->disk);
2772 sd_shutdown(dev);
39b7f1e2 2773
0b950672 2774 mutex_lock(&sd_ref_mutex);
39b7f1e2 2775 dev_set_drvdata(dev, NULL);
ee959b00 2776 put_device(&sdkp->dev);
0b950672 2777 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2778
2779 return 0;
2780}
2781
2782/**
2783 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2784 * @dev: pointer to embedded class device
1da177e4 2785 *
0b950672 2786 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2787 * called on last put, you should always use the scsi_disk_get()
2788 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2789 * and never do a direct put_device.
1da177e4 2790 **/
ee959b00 2791static void scsi_disk_release(struct device *dev)
1da177e4 2792{
ee959b00 2793 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 2794 struct gendisk *disk = sdkp->disk;
2795
4034cc68 2796 spin_lock(&sd_index_lock);
f27bac27 2797 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 2798 spin_unlock(&sd_index_lock);
1da177e4
LT		 2799
2800 disk->private_data = NULL;
1da177e4 2801 put_disk(disk);
39b7f1e2 2802 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 2803
2804 kfree(sdkp);
2805}
2806
cc5d2c8c 2807static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 2808{
2809 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2810 struct scsi_sense_hdr sshdr;
cc5d2c8c 2811 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 2812 int res;
2813
2814 if (start)
2815 cmd[4] |= 1; /* START */
2816
d2886ea3
SR		 2817 if (sdp->start_stop_pwr_cond)
2818 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2819
c3c94c5a
TH		 2820 if (!scsi_device_online(sdp))
2821 return -ENODEV;
2822
2823 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
f4f4e47e 2824 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
c3c94c5a 2825 if (res) {
cc5d2c8c
JB		 2826 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2827 sd_print_result(sdkp, res);
c3c94c5a 2828 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 2829 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 2830 }
2831
2832 return res;
2833}
2834
1da177e4
LT		 2835/*
2836 * Send a SYNCHRONIZE CACHE instruction down to the device through
2837 * the normal SCSI command structure. Wait for the command to
2838 * complete.
2839 */
2840static void sd_shutdown(struct device *dev)
2841{
39b7f1e2 2842 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 2843
2844 if (!sdkp)
2845 return; /* this can happen */
2846
54f57588
LM		 2847 if (pm_runtime_suspended(dev))
2848 goto exit;
2849
39b7f1e2 2850 if (sdkp->WCE) {
e73aec82
MP		 2851 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2852 sd_sync_cache(sdkp);
39b7f1e2 2853 }
c3c94c5a 2854
cc5d2c8c
JB		 2855 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2856 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2857 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2858 }
2859
54f57588 2860exit:
39b7f1e2
AS		 2861 scsi_disk_put(sdkp);
2862}
1da177e4 2863
c3c94c5a
TH		 2864static int sd_suspend(struct device *dev, pm_message_t mesg)
2865{
c3c94c5a 2866 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2867 int ret = 0;
c3c94c5a
TH		 2868
2869 if (!sdkp)
2870 return 0; /* this can happen */
2871
2872 if (sdkp->WCE) {
cc5d2c8c 2873 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 2874 ret = sd_sync_cache(sdkp);
2875 if (ret)
09ff92fe 2876 goto done;
c3c94c5a
TH		 2877 }
2878
3a2d5b70 2879 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 2880 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2881 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2882 }
2883
09ff92fe
AS		 2884done:
2885 scsi_disk_put(sdkp);
2886 return ret;
c3c94c5a
TH		 2887}
2888
2889static int sd_resume(struct device *dev)
2890{
c3c94c5a 2891 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2892 int ret = 0;
c3c94c5a 2893
cc5d2c8c 2894 if (!sdkp->device->manage_start_stop)
09ff92fe 2895 goto done;
c3c94c5a 2896
cc5d2c8c 2897 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 2898 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 2899
09ff92fe
AS		 2900done:
2901 scsi_disk_put(sdkp);
2902 return ret;
c3c94c5a
TH		 2903}
2904
1da177e4
LT		 2905/**
2906 * init_sd - entry point for this driver (both when built in or when
2907 * a module).
2908 *
2909 * Note: this function registers this driver with the scsi mid-level.
2910 **/
2911static int __init init_sd(void)
2912{
5e4009ba 2913 int majors = 0, i, err;
1da177e4
LT		 2914
2915 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2916
2917 for (i = 0; i < SD_MAJORS; i++)
2918 if (register_blkdev(sd_major(i), "sd") == 0)
2919 majors++;
2920
2921 if (!majors)
2922 return -ENODEV;
2923
5e4009ba
JG		 2924 err = class_register(&sd_disk_class);
2925 if (err)
2926 goto err_out;
6bdaa1f1 2927
5e4009ba
JG		 2928 err = scsi_register_driver(&sd_template.gendrv);
2929 if (err)
2930 goto err_out_class;
2931
4e7392ec
MP		 2932 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2933 0, 0, NULL);
2934 if (!sd_cdb_cache) {
2935 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2936 goto err_out_class;
2937 }
2938
2939 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2940 if (!sd_cdb_pool) {
2941 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2942 goto err_out_cache;
2943 }
2944
5e4009ba
JG		 2945 return 0;
2946
4e7392ec
MP		 2947err_out_cache:
2948 kmem_cache_destroy(sd_cdb_cache);
2949
5e4009ba
JG		 2950err_out_class:
2951 class_unregister(&sd_disk_class);
2952err_out:
2953 for (i = 0; i < SD_MAJORS; i++)
2954 unregister_blkdev(sd_major(i), "sd");
2955 return err;
1da177e4
LT		 2956}
2957
2958/**
2959 * exit_sd - exit point for this driver (when it is a module).
2960 *
2961 * Note: this function unregisters this driver from the scsi mid-level.
2962 **/
2963static void __exit exit_sd(void)
2964{
2965 int i;
2966
2967 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2968
4e7392ec
MP		 2969 mempool_destroy(sd_cdb_pool);
2970 kmem_cache_destroy(sd_cdb_cache);
2971
1da177e4 2972 scsi_unregister_driver(&sd_template.gendrv);
5e4009ba
JG		 2973 class_unregister(&sd_disk_class);
2974
1da177e4
LT		 2975 for (i = 0; i < SD_MAJORS; i++)
2976 unregister_blkdev(sd_major(i), "sd");
2977}
2978
1da177e4
LT		 2979module_init(init_sd);
2980module_exit(exit_sd);
e73aec82
MP		 2981
2982static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2983 struct scsi_sense_hdr *sshdr)
2984{
2e4c3329 2985 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 2986 scsi_show_sense_hdr(sshdr);
2e4c3329 2987 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 2988 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2989}
2990
2991static void sd_print_result(struct scsi_disk *sdkp, int result)
2992{
2e4c3329 2993 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 2994 scsi_show_result(result);
2995}
2996
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