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sd: notify block layer when using temporary change to cache_type
[linux-2.6-block.git] / drivers / scsi / sd.c
CommitLineData
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);
5db44863 102static void sd_config_write_same(struct scsi_disk *);
7b3d9545 103static int sd_revalidate_disk(struct gendisk *);
72ec24bd 104static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 105static int sd_probe(struct device *);
106static int sd_remove(struct device *);
107static void sd_shutdown(struct device *);
95897910
ON		 108static int sd_suspend_system(struct device *);
109static int sd_suspend_runtime(struct device *);
7b3d9545
LT		 110static int sd_resume(struct device *);
111static void sd_rescan(struct device *);
a1b73fc1
CH		 112static int sd_init_command(struct scsi_cmnd *SCpnt);
113static void sd_uninit_command(struct scsi_cmnd *SCpnt);
7b3d9545 114static int sd_done(struct scsi_cmnd *);
2451079b 115static int sd_eh_action(struct scsi_cmnd *, int);
7b3d9545 116static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 117static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 118static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
119static void sd_print_result(struct scsi_disk *, int);
120
4034cc68 121static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 122static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 123
124/* This semaphore is used to mediate the 0->1 reference get in the
125 * face of object destruction (i.e. we can't allow a get on an
126 * object after last put) */
0b950672 127static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 128
439d77f7
HS		 129static struct kmem_cache *sd_cdb_cache;
130static mempool_t *sd_cdb_pool;
4e7392ec 131
6bdaa1f1
JB		 132static const char *sd_cache_types[] = {
133 "write through", "none", "write back",
134 "write back, no read (daft)"
135};
136
cb2fb68d
VC		 137static void sd_set_flush_flag(struct scsi_disk *sdkp)
138{
139 unsigned flush = 0;
140
141 if (sdkp->WCE) {
142 flush |= REQ_FLUSH;
143 if (sdkp->DPOFUA)
144 flush |= REQ_FUA;
145 }
146
147 blk_queue_flush(sdkp->disk->queue, flush);
148}
149
ee959b00 150static ssize_t
e1ea2351
GKH		 151cache_type_store(struct device *dev, struct device_attribute *attr,
152 const char *buf, size_t count)
6bdaa1f1
JB		 153{
154 int i, ct = -1, rcd, wce, sp;
ee959b00 155 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 156 struct scsi_device *sdp = sdkp->device;
157 char buffer[64];
158 char *buffer_data;
159 struct scsi_mode_data data;
160 struct scsi_sense_hdr sshdr;
2ee3e26c 161 static const char temp[] = "temporary ";
6bdaa1f1
JB		 162 int len;
163
164 if (sdp->type != TYPE_DISK)
165 /* no cache control on RBC devices; theoretically they
166 * can do it, but there's probably so many exceptions
167 * it's not worth the risk */
168 return -EINVAL;
169
39c60a09
JB		 170 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
171 buf += sizeof(temp) - 1;
172 sdkp->cache_override = 1;
173 } else {
174 sdkp->cache_override = 0;
175 }
176
6391a113 177 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 178 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 179 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
180 buf[len] == '\n') {
181 ct = i;
182 break;
183 }
184 }
185 if (ct < 0)
186 return -EINVAL;
187 rcd = ct & 0x01 ? 1 : 0;
188 wce = ct & 0x02 ? 1 : 0;
39c60a09
JB		 189
190 if (sdkp->cache_override) {
191 sdkp->WCE = wce;
192 sdkp->RCD = rcd;
cb2fb68d 193 sd_set_flush_flag(sdkp);
39c60a09
JB		 194 return count;
195 }
196
6bdaa1f1
JB		 197 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
198 SD_MAX_RETRIES, &data, NULL))
199 return -EINVAL;
a9312fb8 200 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 201 data.block_descriptor_length);
202 buffer_data = buffer + data.header_length +
203 data.block_descriptor_length;
204 buffer_data[2] &= ~0x05;
205 buffer_data[2] |= wce << 2 | rcd;
206 sp = buffer_data[0] & 0x80 ? 1 : 0;
207
208 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
209 SD_MAX_RETRIES, &data, &sshdr)) {
210 if (scsi_sense_valid(&sshdr))
e73aec82 211 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 212 return -EINVAL;
213 }
f98a8cae 214 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 215 return count;
216}
217
ee959b00 218static ssize_t
e1ea2351
GKH		 219manage_start_stop_show(struct device *dev, struct device_attribute *attr,
220 char *buf)
221{
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 struct scsi_device *sdp = sdkp->device;
224
225 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
226}
227
228static ssize_t
229manage_start_stop_store(struct device *dev, struct device_attribute *attr,
230 const char *buf, size_t count)
c3c94c5a 231{
ee959b00 232 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 233 struct scsi_device *sdp = sdkp->device;
234
235 if (!capable(CAP_SYS_ADMIN))
236 return -EACCES;
237
238 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
239
240 return count;
241}
e1ea2351 242static DEVICE_ATTR_RW(manage_start_stop);
c3c94c5a 243
ee959b00 244static ssize_t
e1ea2351
GKH		 245allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
246{
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250}
251
252static ssize_t
253allow_restart_store(struct device *dev, struct device_attribute *attr,
254 const char *buf, size_t count)
a144c5ae 255{
ee959b00 256 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 257 struct scsi_device *sdp = sdkp->device;
258
259 if (!capable(CAP_SYS_ADMIN))
260 return -EACCES;
261
262 if (sdp->type != TYPE_DISK)
263 return -EINVAL;
264
265 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
266
267 return count;
268}
e1ea2351 269static DEVICE_ATTR_RW(allow_restart);
a144c5ae 270
ee959b00 271static ssize_t
e1ea2351 272cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 273{
ee959b00 274 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 275 int ct = sdkp->RCD + 2*sdkp->WCE;
276
277 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
278}
e1ea2351 279static DEVICE_ATTR_RW(cache_type);
6bdaa1f1 280
ee959b00 281static ssize_t
e1ea2351 282FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 283{
ee959b00 284 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 285
286 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
287}
e1ea2351 288static DEVICE_ATTR_RO(FUA);
6bdaa1f1 289
ee959b00 290static ssize_t
e1ea2351
GKH		 291protection_type_show(struct device *dev, struct device_attribute *attr,
292 char *buf)
e0597d70
MP		 293{
294 struct scsi_disk *sdkp = to_scsi_disk(dev);
295
296 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
297}
298
8172499a 299static ssize_t
e1ea2351
GKH		 300protection_type_store(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count)
8172499a
MP		 302{
303 struct scsi_disk *sdkp = to_scsi_disk(dev);
304 unsigned int val;
305 int err;
306
307 if (!capable(CAP_SYS_ADMIN))
308 return -EACCES;
309
310 err = kstrtouint(buf, 10, &val);
311
312 if (err)
313 return err;
314
315 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
316 sdkp->protection_type = val;
317
318 return count;
319}
e1ea2351 320static DEVICE_ATTR_RW(protection_type);
8172499a 321
518fa8e3 322static ssize_t
e1ea2351
GKH		 323protection_mode_show(struct device *dev, struct device_attribute *attr,
324 char *buf)
518fa8e3
MP		 325{
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328 unsigned int dif, dix;
329
330 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
331 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
332
333 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
334 dif = 0;
335 dix = 1;
336 }
337
338 if (!dif && !dix)
339 return snprintf(buf, 20, "none\n");
340
341 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
342}
e1ea2351 343static DEVICE_ATTR_RO(protection_mode);
518fa8e3 344
e0597d70 345static ssize_t
e1ea2351 346app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
e0597d70
MP		 347{
348 struct scsi_disk *sdkp = to_scsi_disk(dev);
349
350 return snprintf(buf, 20, "%u\n", sdkp->ATO);
351}
e1ea2351 352static DEVICE_ATTR_RO(app_tag_own);
e0597d70 353
e339c1a7 354static ssize_t
e1ea2351
GKH		 355thin_provisioning_show(struct device *dev, struct device_attribute *attr,
356 char *buf)
e339c1a7
MP		 357{
358 struct scsi_disk *sdkp = to_scsi_disk(dev);
359
c98a0eb0
MP		 360 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
361}
e1ea2351 362static DEVICE_ATTR_RO(thin_provisioning);
c98a0eb0
MP		 363
364static const char *lbp_mode[] = {
365 [SD_LBP_FULL] = "full",
366 [SD_LBP_UNMAP] = "unmap",
367 [SD_LBP_WS16] = "writesame_16",
368 [SD_LBP_WS10] = "writesame_10",
369 [SD_LBP_ZERO] = "writesame_zero",
370 [SD_LBP_DISABLE] = "disabled",
371};
372
373static ssize_t
e1ea2351
GKH		 374provisioning_mode_show(struct device *dev, struct device_attribute *attr,
375 char *buf)
c98a0eb0
MP		 376{
377 struct scsi_disk *sdkp = to_scsi_disk(dev);
378
379 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
380}
381
382static ssize_t
e1ea2351
GKH		 383provisioning_mode_store(struct device *dev, struct device_attribute *attr,
384 const char *buf, size_t count)
c98a0eb0
MP		 385{
386 struct scsi_disk *sdkp = to_scsi_disk(dev);
387 struct scsi_device *sdp = sdkp->device;
388
389 if (!capable(CAP_SYS_ADMIN))
390 return -EACCES;
391
392 if (sdp->type != TYPE_DISK)
393 return -EINVAL;
394
395 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
396 sd_config_discard(sdkp, SD_LBP_UNMAP);
397 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
398 sd_config_discard(sdkp, SD_LBP_WS16);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
400 sd_config_discard(sdkp, SD_LBP_WS10);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
402 sd_config_discard(sdkp, SD_LBP_ZERO);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
404 sd_config_discard(sdkp, SD_LBP_DISABLE);
405 else
406 return -EINVAL;
407
408 return count;
e339c1a7 409}
e1ea2351 410static DEVICE_ATTR_RW(provisioning_mode);
e339c1a7 411
18a4d0a2 412static ssize_t
e1ea2351
GKH		 413max_medium_access_timeouts_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
18a4d0a2
MP		 415{
416 struct scsi_disk *sdkp = to_scsi_disk(dev);
417
418 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
419}
420
421static ssize_t
e1ea2351
GKH		 422max_medium_access_timeouts_store(struct device *dev,
423 struct device_attribute *attr, const char *buf,
424 size_t count)
18a4d0a2
MP		 425{
426 struct scsi_disk *sdkp = to_scsi_disk(dev);
427 int err;
428
429 if (!capable(CAP_SYS_ADMIN))
430 return -EACCES;
431
432 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
433
434 return err ? err : count;
435}
e1ea2351 436static DEVICE_ATTR_RW(max_medium_access_timeouts);
18a4d0a2 437
5db44863 438static ssize_t
e1ea2351
GKH		 439max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
440 char *buf)
5db44863
MP		 441{
442 struct scsi_disk *sdkp = to_scsi_disk(dev);
443
444 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
445}
446
447static ssize_t
e1ea2351
GKH		 448max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
449 const char *buf, size_t count)
5db44863
MP		 450{
451 struct scsi_disk *sdkp = to_scsi_disk(dev);
452 struct scsi_device *sdp = sdkp->device;
453 unsigned long max;
454 int err;
455
456 if (!capable(CAP_SYS_ADMIN))
457 return -EACCES;
458
459 if (sdp->type != TYPE_DISK)
460 return -EINVAL;
461
462 err = kstrtoul(buf, 10, &max);
463
464 if (err)
465 return err;
466
467 if (max == 0)
468 sdp->no_write_same = 1;
66c28f97
MP		 469 else if (max <= SD_MAX_WS16_BLOCKS) {
470 sdp->no_write_same = 0;
5db44863 471 sdkp->max_ws_blocks = max;
66c28f97 472 }
5db44863
MP		 473
474 sd_config_write_same(sdkp);
475
476 return count;
477}
e1ea2351
GKH		 478static DEVICE_ATTR_RW(max_write_same_blocks);
479
480static struct attribute *sd_disk_attrs[] = {
481 &dev_attr_cache_type.attr,
482 &dev_attr_FUA.attr,
483 &dev_attr_allow_restart.attr,
484 &dev_attr_manage_start_stop.attr,
485 &dev_attr_protection_type.attr,
486 &dev_attr_protection_mode.attr,
487 &dev_attr_app_tag_own.attr,
488 &dev_attr_thin_provisioning.attr,
489 &dev_attr_provisioning_mode.attr,
490 &dev_attr_max_write_same_blocks.attr,
491 &dev_attr_max_medium_access_timeouts.attr,
492 NULL,
6bdaa1f1 493};
e1ea2351 494ATTRIBUTE_GROUPS(sd_disk);
6bdaa1f1
JB		 495
496static struct class sd_disk_class = {
497 .name = "scsi_disk",
498 .owner = THIS_MODULE,
ee959b00 499 .dev_release = scsi_disk_release,
e1ea2351 500 .dev_groups = sd_disk_groups,
6bdaa1f1 501};
1da177e4 502
691e3d31 503static const struct dev_pm_ops sd_pm_ops = {
95897910 504 .suspend = sd_suspend_system,
691e3d31 505 .resume = sd_resume,
95897910 506 .poweroff = sd_suspend_system,
691e3d31 507 .restore = sd_resume,
95897910 508 .runtime_suspend = sd_suspend_runtime,
691e3d31
AL		 509 .runtime_resume = sd_resume,
510};
511
1da177e4
LT		 512static struct scsi_driver sd_template = {
513 .owner = THIS_MODULE,
514 .gendrv = {
515 .name = "sd",
516 .probe = sd_probe,
517 .remove = sd_remove,
518 .shutdown = sd_shutdown,
691e3d31 519 .pm = &sd_pm_ops,
1da177e4
LT		 520 },
521 .rescan = sd_rescan,
a1b73fc1
CH		 522 .init_command = sd_init_command,
523 .uninit_command = sd_uninit_command,
7b3d9545 524 .done = sd_done,
18a4d0a2 525 .eh_action = sd_eh_action,
1da177e4
LT		 526};
527
0761df9c
HR		 528/*
529 * Dummy kobj_map->probe function.
530 * The default ->probe function will call modprobe, which is
531 * pointless as this module is already loaded.
532 */
533static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
534{
535 return NULL;
536}
537
1da177e4
LT		 538/*
539 * Device no to disk mapping:
540 *
541 * major disc2 disc p1
542 * |............|.............|....|....| <- dev_t
543 * 31 20 19 8 7 4 3 0
544 *
545 * Inside a major, we have 16k disks, however mapped non-
546 * contiguously. The first 16 disks are for major0, the next
547 * ones with major1, ... Disk 256 is for major0 again, disk 272
548 * for major1, ...
549 * As we stay compatible with our numbering scheme, we can reuse
550 * the well-know SCSI majors 8, 65--71, 136--143.
551 */
552static int sd_major(int major_idx)
553{
554 switch (major_idx) {
555 case 0:
556 return SCSI_DISK0_MAJOR;
557 case 1 ... 7:
558 return SCSI_DISK1_MAJOR + major_idx - 1;
559 case 8 ... 15:
560 return SCSI_DISK8_MAJOR + major_idx - 8;
561 default:
562 BUG();
563 return 0; /* shut up gcc */
564 }
565}
566
39b7f1e2 567static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 568{
569 struct scsi_disk *sdkp = NULL;
570
39b7f1e2
AS		 571 if (disk->private_data) {
572 sdkp = scsi_disk(disk);
573 if (scsi_device_get(sdkp->device) == 0)
ee959b00 574 get_device(&sdkp->dev);
39b7f1e2
AS		 575 else
576 sdkp = NULL;
577 }
578 return sdkp;
579}
580
581static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
582{
583 struct scsi_disk *sdkp;
584
0b950672 585 mutex_lock(&sd_ref_mutex);
39b7f1e2 586 sdkp = __scsi_disk_get(disk);
0b950672 587 mutex_unlock(&sd_ref_mutex);
1da177e4 588 return sdkp;
39b7f1e2 589}
1da177e4 590
39b7f1e2
AS		 591static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
592{
593 struct scsi_disk *sdkp;
594
0b950672 595 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 596 sdkp = dev_get_drvdata(dev);
597 if (sdkp)
598 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 599 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 600 return sdkp;
601}
602
603static void scsi_disk_put(struct scsi_disk *sdkp)
604{
605 struct scsi_device *sdev = sdkp->device;
606
0b950672 607 mutex_lock(&sd_ref_mutex);
ee959b00 608 put_device(&sdkp->dev);
1da177e4 609 scsi_device_put(sdev);
0b950672 610 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 611}
612
35e1a5d9
MP		 613static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
614{
615 unsigned int prot_op = SCSI_PROT_NORMAL;
616 unsigned int dix = scsi_prot_sg_count(scmd);
617
618 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
619 if (dif && dix)
620 prot_op = SCSI_PROT_READ_PASS;
621 else if (dif && !dix)
622 prot_op = SCSI_PROT_READ_STRIP;
623 else if (!dif && dix)
624 prot_op = SCSI_PROT_READ_INSERT;
625 } else {
626 if (dif && dix)
627 prot_op = SCSI_PROT_WRITE_PASS;
628 else if (dif && !dix)
629 prot_op = SCSI_PROT_WRITE_INSERT;
630 else if (!dif && dix)
631 prot_op = SCSI_PROT_WRITE_STRIP;
632 }
633
634 scsi_set_prot_op(scmd, prot_op);
635 scsi_set_prot_type(scmd, dif);
636}
637
c98a0eb0
MP		 638static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
639{
640 struct request_queue *q = sdkp->disk->queue;
641 unsigned int logical_block_size = sdkp->device->sector_size;
642 unsigned int max_blocks = 0;
643
644 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 645 q->limits.discard_alignment = sdkp->unmap_alignment *
646 logical_block_size;
c98a0eb0
MP		 647 q->limits.discard_granularity =
648 max(sdkp->physical_block_size,
649 sdkp->unmap_granularity * logical_block_size);
650
89730393
MP		 651 sdkp->provisioning_mode = mode;
652
c98a0eb0
MP		 653 switch (mode) {
654
655 case SD_LBP_DISABLE:
656 q->limits.max_discard_sectors = 0;
657 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
658 return;
659
660 case SD_LBP_UNMAP:
5db44863
MP		 661 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
662 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 663 break;
664
665 case SD_LBP_WS16:
5db44863
MP		 666 max_blocks = min_not_zero(sdkp->max_ws_blocks,
667 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 668 break;
669
670 case SD_LBP_WS10:
5db44863
MP		 671 max_blocks = min_not_zero(sdkp->max_ws_blocks,
672 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 673 break;
674
675 case SD_LBP_ZERO:
5db44863
MP		 676 max_blocks = min_not_zero(sdkp->max_ws_blocks,
677 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 678 q->limits.discard_zeroes_data = 1;
679 break;
680 }
681
682 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
683 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 684}
685
e339c1a7 686/**
26e85fcd 687 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 688 * @sdp: scsi device to operate one
e339c1a7
MP		 689 * @rq: Request to prepare
690 *
691 * Will issue either UNMAP or WRITE SAME(16) depending on preference
692 * indicated by target device.
693 **/
26e85fcd 694static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 695{
696 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 697 sector_t sector = blk_rq_pos(rq);
698 unsigned int nr_sectors = blk_rq_sectors(rq);
699 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 700 unsigned int len;
f1126e95 701 int ret;
c98a0eb0 702 char *buf;
66ac0280 703 struct page *page;
e339c1a7 704
26e85fcd
MP		 705 sector >>= ilog2(sdp->sector_size) - 9;
706 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 707 rq->timeout = SD_TIMEOUT;
708
709 memset(rq->cmd, 0, rq->cmd_len);
710
66ac0280
CH		 711 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
712 if (!page)
713 return BLKPREP_DEFER;
714
c98a0eb0
MP		 715 switch (sdkp->provisioning_mode) {
716 case SD_LBP_UNMAP:
717 buf = page_address(page);
e339c1a7 718
66ac0280 719 rq->cmd_len = 10;
e339c1a7
MP		 720 rq->cmd[0] = UNMAP;
721 rq->cmd[8] = 24;
e339c1a7
MP		 722
723 put_unaligned_be16(6 + 16, &buf[0]);
724 put_unaligned_be16(16, &buf[2]);
725 put_unaligned_be64(sector, &buf[8]);
66ac0280 726 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 727
66ac0280 728 len = 24;
c98a0eb0
MP		 729 break;
730
731 case SD_LBP_WS16:
66ac0280 732 rq->cmd_len = 16;
e339c1a7
MP		 733 rq->cmd[0] = WRITE_SAME_16;
734 rq->cmd[1] = 0x8; /* UNMAP */
735 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 736 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
737
738 len = sdkp->device->sector_size;
c98a0eb0
MP		 739 break;
740
741 case SD_LBP_WS10:
742 case SD_LBP_ZERO:
743 rq->cmd_len = 10;
744 rq->cmd[0] = WRITE_SAME;
745 if (sdkp->provisioning_mode == SD_LBP_WS10)
746 rq->cmd[1] = 0x8; /* UNMAP */
747 put_unaligned_be32(sector, &rq->cmd[2]);
748 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
749
750 len = sdkp->device->sector_size;
751 break;
752
753 default:
09b9cc44 754 ret = BLKPREP_KILL;
c98a0eb0 755 goto out;
e339c1a7
MP		 756 }
757
dc4a9307 758 rq->completion_data = page;
66ac0280 759 blk_add_request_payload(rq, page, len);
f1126e95 760 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
26e85fcd 761 rq->__data_len = nr_bytes;
c98a0eb0
MP		 762
763out:
b4f42e28 764 if (ret != BLKPREP_OK)
610a6349 765 __free_page(page);
f1126e95
FT		 766 return ret;
767}
768
5db44863
MP		 769static void sd_config_write_same(struct scsi_disk *sdkp)
770{
771 struct request_queue *q = sdkp->disk->queue;
772 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 773
774 if (sdkp->device->no_write_same) {
775 sdkp->max_ws_blocks = 0;
776 goto out;
777 }
778
779 /* Some devices can not handle block counts above 0xffff despite
780 * supporting WRITE SAME(16). Consequently we default to 64k
781 * blocks per I/O unless the device explicitly advertises a
782 * bigger limit.
783 */
66c28f97
MP		 784 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
785 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
786 (u32)SD_MAX_WS16_BLOCKS);
787 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
788 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
789 (u32)SD_MAX_WS10_BLOCKS);
790 else {
791 sdkp->device->no_write_same = 1;
792 sdkp->max_ws_blocks = 0;
793 }
5db44863
MP		 794
795out:
66c28f97
MP		 796 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
797 (logical_block_size >> 9));
5db44863
MP		 798}
799
800/**
801 * sd_setup_write_same_cmnd - write the same data to multiple blocks
802 * @sdp: scsi device to operate one
803 * @rq: Request to prepare
804 *
805 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
806 * preference indicated by target device.
807 **/
808static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
809{
810 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
811 struct bio *bio = rq->bio;
812 sector_t sector = blk_rq_pos(rq);
813 unsigned int nr_sectors = blk_rq_sectors(rq);
814 unsigned int nr_bytes = blk_rq_bytes(rq);
815 int ret;
816
817 if (sdkp->device->no_write_same)
818 return BLKPREP_KILL;
819
a4ad39b1 820 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863
MP		 821
822 sector >>= ilog2(sdp->sector_size) - 9;
823 nr_sectors >>= ilog2(sdp->sector_size) - 9;
824
825 rq->__data_len = sdp->sector_size;
826 rq->timeout = SD_WRITE_SAME_TIMEOUT;
827 memset(rq->cmd, 0, rq->cmd_len);
828
829 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
830 rq->cmd_len = 16;
831 rq->cmd[0] = WRITE_SAME_16;
832 put_unaligned_be64(sector, &rq->cmd[2]);
833 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
834 } else {
835 rq->cmd_len = 10;
836 rq->cmd[0] = WRITE_SAME;
837 put_unaligned_be32(sector, &rq->cmd[2]);
838 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
839 }
840
841 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
842 rq->__data_len = nr_bytes;
843
844 return ret;
845}
846
90467c29
FT		 847static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
848{
7e660100 849 rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
90467c29
FT		 850 rq->retries = SD_MAX_RETRIES;
851 rq->cmd[0] = SYNCHRONIZE_CACHE;
852 rq->cmd_len = 10;
853
854 return scsi_setup_blk_pc_cmnd(sdp, rq);
855}
856
a1b73fc1 857static void sd_uninit_command(struct scsi_cmnd *SCpnt)
f1126e95 858{
a1b73fc1 859 struct request *rq = SCpnt->request;
085b513f 860
dc4a9307
JA		 861 if (rq->cmd_flags & REQ_DISCARD)
862 __free_page(rq->completion_data);
b4f42e28 863
085b513f
EM		 864 if (SCpnt->cmnd != rq->cmd) {
865 mempool_free(SCpnt->cmnd, sd_cdb_pool);
866 SCpnt->cmnd = NULL;
867 SCpnt->cmd_len = 0;
868 }
e339c1a7
MP		 869}
870
a1b73fc1 871static int sd_init_command(struct scsi_cmnd *SCpnt)
1da177e4 872{
a1b73fc1
CH		 873 struct request *rq = SCpnt->request;
874 struct scsi_device *sdp = SCpnt->device;
776b23a0 875 struct gendisk *disk = rq->rq_disk;
af55ff67 876 struct scsi_disk *sdkp;
83096ebf 877 sector_t block = blk_rq_pos(rq);
18351070 878 sector_t threshold;
83096ebf 879 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 880 int ret, host_dif;
4e7392ec 881 unsigned char protect;
7f9a6bc4 882
e339c1a7
MP		 883 /*
884 * Discard request come in as REQ_TYPE_FS but we turn them into
885 * block PC requests to make life easier.
886 */
66ac0280 887 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 888 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 889 goto out;
5db44863
MP		 890 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
891 ret = sd_setup_write_same_cmnd(sdp, rq);
892 goto out;
90467c29
FT		 893 } else if (rq->cmd_flags & REQ_FLUSH) {
894 ret = scsi_setup_flush_cmnd(sdp, rq);
895 goto out;
7f9a6bc4
JB		 896 }
897 ret = scsi_setup_fs_cmnd(sdp, rq);
898 if (ret != BLKPREP_OK)
899 goto out;
900 SCpnt = rq->special;
af55ff67 901 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 902
903 /* from here on until we're complete, any goto out
904 * is used for a killable error condition */
905 ret = BLKPREP_KILL;
1da177e4 906
a1b73fc1
CH		 907 SCSI_LOG_HLQUEUE(1,
908 scmd_printk(KERN_INFO, SCpnt,
909 "%s: block=%llu, count=%d\n",
910 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 911
912 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 913 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 914 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 915 "Finishing %u sectors\n",
916 blk_rq_sectors(rq)));
fa0d34be
MP		 917 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
918 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 919 goto out;
1da177e4
LT		 920 }
921
922 if (sdp->changed) {
923 /*
924 * quietly refuse to do anything to a changed disc until
925 * the changed bit has been reset
926 */
3ff5588d 927 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 928 goto out;
1da177e4 929 }
7f9a6bc4 930
a0899d4d 931 /*
18351070
LT		 932 * Some SD card readers can't handle multi-sector accesses which touch
933 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 934 */
18351070
LT		 935 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
936 (sdp->sector_size / 512);
937
938 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
939 if (block < threshold) {
940 /* Access up to the threshold but not beyond */
941 this_count = threshold - block;
942 } else {
943 /* Access only a single hardware sector */
944 this_count = sdp->sector_size / 512;
945 }
946 }
a0899d4d 947
fa0d34be
MP		 948 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
949 (unsigned long long)block));
1da177e4
LT		 950
951 /*
952 * If we have a 1K hardware sectorsize, prevent access to single
953 * 512 byte sectors. In theory we could handle this - in fact
954 * the scsi cdrom driver must be able to handle this because
955 * we typically use 1K blocksizes, and cdroms typically have
956 * 2K hardware sectorsizes. Of course, things are simpler
957 * with the cdrom, since it is read-only. For performance
958 * reasons, the filesystems should be able to handle this
959 * and not force the scsi disk driver to use bounce buffers
960 * for this.
961 */
962 if (sdp->sector_size == 1024) {
83096ebf 963 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 964 scmd_printk(KERN_ERR, SCpnt,
965 "Bad block number requested\n");
7f9a6bc4 966 goto out;
1da177e4
LT		 967 } else {
968 block = block >> 1;
969 this_count = this_count >> 1;
970 }
971 }
972 if (sdp->sector_size == 2048) {
83096ebf 973 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 974 scmd_printk(KERN_ERR, SCpnt,
975 "Bad block number requested\n");
7f9a6bc4 976 goto out;
1da177e4
LT		 977 } else {
978 block = block >> 2;
979 this_count = this_count >> 2;
980 }
981 }
982 if (sdp->sector_size == 4096) {
83096ebf 983 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 984 scmd_printk(KERN_ERR, SCpnt,
985 "Bad block number requested\n");
7f9a6bc4 986 goto out;
1da177e4
LT		 987 } else {
988 block = block >> 3;
989 this_count = this_count >> 3;
990 }
991 }
992 if (rq_data_dir(rq) == WRITE) {
993 if (!sdp->writeable) {
7f9a6bc4 994 goto out;
1da177e4
LT		 995 }
996 SCpnt->cmnd[0] = WRITE_6;
997 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 998
8c579ab6
MP		 999 if (blk_integrity_rq(rq))
1000 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 1001
1da177e4
LT		 1002 } else if (rq_data_dir(rq) == READ) {
1003 SCpnt->cmnd[0] = READ_6;
1004 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1005 } else {
5953316d 1006 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
7f9a6bc4 1007 goto out;
1da177e4
LT		 1008 }
1009
fa0d34be 1010 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1011 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1012 (rq_data_dir(rq) == WRITE) ?
1013 "writing" : "reading", this_count,
83096ebf 1014 blk_rq_sectors(rq)));
1da177e4 1015
af55ff67 1016 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 1017 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1018 if (host_dif)
4e7392ec 1019 protect = 1 << 5;
af55ff67 1020 else
4e7392ec
MP		 1021 protect = 0;
1022
1023 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1024 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1025
1026 if (unlikely(SCpnt->cmnd == NULL)) {
1027 ret = BLKPREP_DEFER;
1028 goto out;
1029 }
af55ff67 1030
4e7392ec
MP		 1031 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1032 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1033 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1034 SCpnt->cmnd[7] = 0x18;
1035 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1036 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1037
1038 /* LBA */
1039 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1040 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1041 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1042 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1043 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1044 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1045 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1046 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1047
1048 /* Expected Indirect LBA */
1049 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1050 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1051 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1052 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1053
1054 /* Transfer length */
1055 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1056 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1057 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1058 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1059 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1060 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1061 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1062 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1067 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1068 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1069 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1070 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1071 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1072 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1073 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1074 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1075 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1076 scsi_device_protection(SCpnt->device) ||
1da177e4 1077 SCpnt->device->use_10_for_rw) {
1da177e4 1078 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1079 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1080 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1081 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1082 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1083 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1084 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1085 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1086 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1087 } else {
33659ebb 1088 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1089 /*
1090 * This happens only if this drive failed
1091 * 10byte rw command with ILLEGAL_REQUEST
1092 * during operation and thus turned off
1093 * use_10_for_rw.
1094 */
e73aec82
MP		 1095 scmd_printk(KERN_ERR, SCpnt,
1096 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1097 goto out;
007365ad
TH		 1098 }
1099
1da177e4
LT		 1100 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1101 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1102 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1103 SCpnt->cmnd[4] = (unsigned char) this_count;
1104 SCpnt->cmnd[5] = 0;
1105 }
30b0c37b 1106 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1107
af55ff67 1108 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1109 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1110 sd_prot_op(SCpnt, host_dif);
af55ff67 1111
1da177e4
LT		 1112 /*
1113 * We shouldn't disconnect in the middle of a sector, so with a dumb
1114 * host adapter, it's safe to assume that we can at least transfer
1115 * this many bytes between each connect / disconnect.
1116 */
1117 SCpnt->transfersize = sdp->sector_size;
1118 SCpnt->underflow = this_count << 9;
1119 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1120
1da177e4
LT		 1121 /*
1122 * This indicates that the command is ready from our end to be
1123 * queued.
1124 */
7f9a6bc4
JB		 1125 ret = BLKPREP_OK;
1126 out:
a1b73fc1 1127 return ret;
1da177e4
LT		 1128}
1129
1130/**
1131 * sd_open - open a scsi disk device
1132 * @inode: only i_rdev member may be used
1133 * @filp: only f_mode and f_flags may be used
1134 *
1135 * Returns 0 if successful. Returns a negated errno value in case
1136 * of error.
1137 *
1138 * Note: This can be called from a user context (e.g. fsck(1) )
1139 * or from within the kernel (e.g. as a result of a mount(1) ).
1140 * In the latter case @inode and @filp carry an abridged amount
1141 * of information as noted above.
409f3499
AB		 1142 *
1143 * Locking: called with bdev->bd_mutex held.
1da177e4 1144 **/
0338e291 1145static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1146{
0338e291 1147 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1148 struct scsi_device *sdev;
1149 int retval;
1150
0338e291 1151 if (!sdkp)
1da177e4
LT		 1152 return -ENXIO;
1153
fa0d34be 1154 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1155
1156 sdev = sdkp->device;
1157
1158 /*
1159 * If the device is in error recovery, wait until it is done.
1160 * If the device is offline, then disallow any access to it.
1161 */
1162 retval = -ENXIO;
1163 if (!scsi_block_when_processing_errors(sdev))
1164 goto error_out;
1165
1166 if (sdev->removable || sdkp->write_prot)
0338e291 1167 check_disk_change(bdev);
1da177e4
LT		 1168
1169 /*
1170 * If the drive is empty, just let the open fail.
1171 */
1172 retval = -ENOMEDIUM;
0338e291 1173 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1174 goto error_out;
1175
1176 /*
1177 * If the device has the write protect tab set, have the open fail
1178 * if the user expects to be able to write to the thing.
1179 */
1180 retval = -EROFS;
0338e291 1181 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1182 goto error_out;
1183
1184 /*
1185 * It is possible that the disk changing stuff resulted in
1186 * the device being taken offline. If this is the case,
1187 * report this to the user, and don't pretend that the
1188 * open actually succeeded.
1189 */
1190 retval = -ENXIO;
1191 if (!scsi_device_online(sdev))
1192 goto error_out;
1193
409f3499 1194 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1195 if (scsi_block_when_processing_errors(sdev))
1196 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1197 }
1198
1199 return 0;
1200
1201error_out:
1202 scsi_disk_put(sdkp);
1203 return retval;
1204}
1205
1206/**
1207 * sd_release - invoked when the (last) close(2) is called on this
1208 * scsi disk.
1209 * @inode: only i_rdev member may be used
1210 * @filp: only f_mode and f_flags may be used
1211 *
1212 * Returns 0.
1213 *
1214 * Note: may block (uninterruptible) if error recovery is underway
1215 * on this disk.
409f3499
AB		 1216 *
1217 * Locking: called with bdev->bd_mutex held.
1da177e4 1218 **/
db2a144b 1219static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1220{
1da177e4
LT		 1221 struct scsi_disk *sdkp = scsi_disk(disk);
1222 struct scsi_device *sdev = sdkp->device;
1223
56937f7b 1224 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1225
7e443312 1226 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1227 if (scsi_block_when_processing_errors(sdev))
1228 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1229 }
1230
1231 /*
1232 * XXX and what if there are packets in flight and this close()
1233 * XXX is followed by a "rmmod sd_mod"?
1234 */
478a8a05 1235
1da177e4 1236 scsi_disk_put(sdkp);
1da177e4
LT		 1237}
1238
a885c8c4 1239static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1240{
1241 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1242 struct scsi_device *sdp = sdkp->device;
1243 struct Scsi_Host *host = sdp->host;
1244 int diskinfo[4];
1245
1246 /* default to most commonly used values */
1247 diskinfo[0] = 0x40; /* 1 << 6 */
1248 diskinfo[1] = 0x20; /* 1 << 5 */
1249 diskinfo[2] = sdkp->capacity >> 11;
1250
1251 /* override with calculated, extended default, or driver values */
1252 if (host->hostt->bios_param)
1253 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1254 else
1255 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1256
a885c8c4
CH		 1257 geo->heads = diskinfo[0];
1258 geo->sectors = diskinfo[1];
1259 geo->cylinders = diskinfo[2];
1da177e4
LT		 1260 return 0;
1261}
1262
1263/**
1264 * sd_ioctl - process an ioctl
1265 * @inode: only i_rdev/i_bdev members may be used
1266 * @filp: only f_mode and f_flags may be used
1267 * @cmd: ioctl command number
1268 * @arg: this is third argument given to ioctl(2) system call.
1269 * Often contains a pointer.
1270 *
25985edc 1271 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1272 * success as well). Returns a negated errno value in case of error.
1273 *
1274 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1275 * down in the scsi subsystem.
1da177e4 1276 **/
0338e291 1277static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1278 unsigned int cmd, unsigned long arg)
1279{
1da177e4 1280 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1281 struct scsi_disk *sdkp = scsi_disk(disk);
1282 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1283 void __user *p = (void __user *)arg;
1284 int error;
1285
fe2d1851
NN		 1286 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1287 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1288
0bfc96cb
PB		 1289 error = scsi_verify_blk_ioctl(bdev, cmd);
1290 if (error < 0)
1291 return error;
1292
1da177e4
LT		 1293 /*
1294 * If we are in the middle of error recovery, don't let anyone
1295 * else try and use this device. Also, if error recovery fails, it
1296 * may try and take the device offline, in which case all further
1297 * access to the device is prohibited.
1298 */
83ff6fe8 1299 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1300 (mode & FMODE_NDELAY) != 0);
1da177e4 1301 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1302 goto out;
1da177e4 1303
1da177e4
LT		 1304 /*
1305 * Send SCSI addressing ioctls directly to mid level, send other
1306 * ioctls to block level and then onto mid level if they can't be
1307 * resolved.
1308 */
1309 switch (cmd) {
1310 case SCSI_IOCTL_GET_IDLUN:
1311 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1312 error = scsi_ioctl(sdp, cmd, p);
1313 break;
1da177e4 1314 default:
577ebb37 1315 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1316 if (error != -ENOTTY)
8a6cfeb6
AB		 1317 break;
1318 error = scsi_ioctl(sdp, cmd, p);
1319 break;
1da177e4 1320 }
8a6cfeb6 1321out:
8a6cfeb6 1322 return error;
1da177e4
LT		 1323}
1324
1325static void set_media_not_present(struct scsi_disk *sdkp)
1326{
2bae0093
TH		 1327 if (sdkp->media_present)
1328 sdkp->device->changed = 1;
1329
1330 if (sdkp->device->removable) {
1331 sdkp->media_present = 0;
1332 sdkp->capacity = 0;
1333 }
1334}
1335
1336static int media_not_present(struct scsi_disk *sdkp,
1337 struct scsi_sense_hdr *sshdr)
1338{
1339 if (!scsi_sense_valid(sshdr))
1340 return 0;
1341
1342 /* not invoked for commands that could return deferred errors */
1343 switch (sshdr->sense_key) {
1344 case UNIT_ATTENTION:
1345 case NOT_READY:
1346 /* medium not present */
1347 if (sshdr->asc == 0x3A) {
1348 set_media_not_present(sdkp);
1349 return 1;
1350 }
1351 }
1352 return 0;
1da177e4
LT		 1353}
1354
1355/**
2bae0093
TH		 1356 * sd_check_events - check media events
1357 * @disk: kernel device descriptor
1358 * @clearing: disk events currently being cleared
1da177e4 1359 *
2bae0093 1360 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1361 *
1362 * Note: this function is invoked from the block subsystem.
1363 **/
2bae0093 1364static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1365{
1366 struct scsi_disk *sdkp = scsi_disk(disk);
1367 struct scsi_device *sdp = sdkp->device;
001aac25 1368 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1369 int retval;
1370
2bae0093 1371 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1372
1373 /*
1374 * If the device is offline, don't send any commands - just pretend as
1375 * if the command failed. If the device ever comes back online, we
1376 * can deal with it then. It is only because of unrecoverable errors
1377 * that we would ever take a device offline in the first place.
1378 */
285e9670
KS		 1379 if (!scsi_device_online(sdp)) {
1380 set_media_not_present(sdkp);
285e9670
KS		 1381 goto out;
1382 }
1da177e4
LT		 1383
1384 /*
1385 * Using TEST_UNIT_READY enables differentiation between drive with
1386 * no cartridge loaded - NOT READY, drive with changed cartridge -
1387 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1388 *
1389 * Drives that auto spin down. eg iomega jaz 1G, will be started
1390 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1391 * sd_revalidate() is called.
1392 */
1393 retval = -ENODEV;
285e9670 1394
001aac25
JB		 1395 if (scsi_block_when_processing_errors(sdp)) {
1396 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1397 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1398 sshdr);
1399 }
1da177e4 1400
2bae0093
TH		 1401 /* failed to execute TUR, assume media not present */
1402 if (host_byte(retval)) {
285e9670 1403 set_media_not_present(sdkp);
285e9670
KS		 1404 goto out;
1405 }
1da177e4 1406
2bae0093
TH		 1407 if (media_not_present(sdkp, sshdr))
1408 goto out;
1409
1da177e4
LT		 1410 /*
1411 * For removable scsi disk we have to recognise the presence
2bae0093 1412 * of a disk in the drive.
1da177e4 1413 */
2bae0093
TH		 1414 if (!sdkp->media_present)
1415 sdp->changed = 1;
1da177e4 1416 sdkp->media_present = 1;
285e9670 1417out:
3ff5588d 1418 /*
2bae0093 1419 * sdp->changed is set under the following conditions:
3ff5588d 1420 *
2bae0093
TH		 1421 * Medium present state has changed in either direction.
1422 * Device has indicated UNIT_ATTENTION.
3ff5588d 1423 */
001aac25 1424 kfree(sshdr);
2bae0093
TH		 1425 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1426 sdp->changed = 0;
1da177e4 1427 return retval;
1da177e4
LT		 1428}
1429
e73aec82 1430static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1431{
1da177e4 1432 int retries, res;
e73aec82 1433 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1434 const int timeout = sdp->request_queue->rq_timeout
1435 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1436 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1437
1438 if (!scsi_device_online(sdp))
1439 return -ENODEV;
1440
1da177e4
LT		 1441 for (retries = 3; retries > 0; --retries) {
1442 unsigned char cmd[10] = { 0 };
1443
1444 cmd[0] = SYNCHRONIZE_CACHE;
1445 /*
1446 * Leave the rest of the command zero to indicate
1447 * flush everything.
1448 */
9b21493c 1449 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
7e660100
JB		 1450 &sshdr, timeout, SD_MAX_RETRIES,
1451 NULL, REQ_PM);
ea73a9f2 1452 if (res == 0)
1da177e4
LT		 1453 break;
1454 }
1455
e73aec82
MP		 1456 if (res) {
1457 sd_print_result(sdkp, res);
95897910 1458
e73aec82
MP		 1459 if (driver_byte(res) & DRIVER_SENSE)
1460 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1461 /* we need to evaluate the error return */
1462 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1463 (sshdr.asc == 0x3a || /* medium not present */
1464 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1465 /* this is no error here */
1466 return 0;
1467
1468 switch (host_byte(res)) {
1469 /* ignore errors due to racing a disconnection */
1470 case DID_BAD_TARGET:
1471 case DID_NO_CONNECT:
1472 return 0;
1473 /* signal the upper layer it might try again */
1474 case DID_BUS_BUSY:
1475 case DID_IMM_RETRY:
1476 case DID_REQUEUE:
1477 case DID_SOFT_ERROR:
1478 return -EBUSY;
1479 default:
1480 return -EIO;
1481 }
1da177e4 1482 }
3721050a 1483 return 0;
1da177e4
LT		 1484}
1485
1da177e4
LT		 1486static void sd_rescan(struct device *dev)
1487{
39b7f1e2
AS		 1488 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1489
1490 if (sdkp) {
f98a8cae 1491 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1492 scsi_disk_put(sdkp);
1493 }
1da177e4
LT		 1494}
1495
1496
1497#ifdef CONFIG_COMPAT
1498/*
1499 * This gets directly called from VFS. When the ioctl
1500 * is not recognized we go back to the other translation paths.
1501 */
0338e291
AV		 1502static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1503 unsigned int cmd, unsigned long arg)
1da177e4 1504{
0338e291 1505 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1506 int ret;
1507
1508 ret = scsi_verify_blk_ioctl(bdev, cmd);
1509 if (ret < 0)
1510 return ret;
1da177e4
LT		 1511
1512 /*
1513 * If we are in the middle of error recovery, don't let anyone
1514 * else try and use this device. Also, if error recovery fails, it
1515 * may try and take the device offline, in which case all further
1516 * access to the device is prohibited.
1517 */
1518 if (!scsi_block_when_processing_errors(sdev))
1519 return -ENODEV;
1520
1521 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1522 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1523
1524 return ret;
1525 }
1526
1527 /*
1528 * Let the static ioctl translation table take care of it.
1529 */
1530 return -ENOIOCTLCMD;
1531}
1532#endif
1533
83d5cde4 1534static const struct block_device_operations sd_fops = {
1da177e4 1535 .owner = THIS_MODULE,
0338e291
AV		 1536 .open = sd_open,
1537 .release = sd_release,
8a6cfeb6 1538 .ioctl = sd_ioctl,
a885c8c4 1539 .getgeo = sd_getgeo,
1da177e4 1540#ifdef CONFIG_COMPAT
0338e291 1541 .compat_ioctl = sd_compat_ioctl,
1da177e4 1542#endif
2bae0093 1543 .check_events = sd_check_events,
1da177e4 1544 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1545 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1546};
1547
18a4d0a2
MP		 1548/**
1549 * sd_eh_action - error handling callback
1550 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1551 * @eh_disp: The recovery disposition suggested by the midlayer
1552 *
2451079b
JB		 1553 * This function is called by the SCSI midlayer upon completion of an
1554 * error test command (currently TEST UNIT READY). The result of sending
1555 * the eh command is passed in eh_disp. We're looking for devices that
1556 * fail medium access commands but are OK with non access commands like
1557 * test unit ready (so wrongly see the device as having a successful
1558 * recovery)
18a4d0a2 1559 **/
2451079b 1560static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1561{
1562 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1563
1564 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1565 !scsi_medium_access_command(scmd) ||
1566 host_byte(scmd->result) != DID_TIME_OUT ||
1567 eh_disp != SUCCESS)
18a4d0a2
MP		 1568 return eh_disp;
1569
1570 /*
1571 * The device has timed out executing a medium access command.
1572 * However, the TEST UNIT READY command sent during error
1573 * handling completed successfully. Either the device is in the
1574 * process of recovering or has it suffered an internal failure
1575 * that prevents access to the storage medium.
1576 */
2451079b 1577 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1578
1579 /*
1580 * If the device keeps failing read/write commands but TEST UNIT
1581 * READY always completes successfully we assume that medium
1582 * access is no longer possible and take the device offline.
1583 */
1584 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1585 scmd_printk(KERN_ERR, scmd,
1586 "Medium access timeout failure. Offlining disk!\n");
1587 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1588
1589 return FAILED;
1590 }
1591
1592 return eh_disp;
1593}
1594
af55ff67
MP		 1595static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1596{
83096ebf
TH		 1597 u64 start_lba = blk_rq_pos(scmd->request);
1598 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1599 u64 bad_lba;
1600 int info_valid;
a8733c7b
JB		 1601 /*
1602 * resid is optional but mostly filled in. When it's unused,
1603 * its value is zero, so we assume the whole buffer transferred
1604 */
1605 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1606 unsigned int good_bytes;
af55ff67 1607
33659ebb 1608 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1609 return 0;
1610
1611 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1612 SCSI_SENSE_BUFFERSIZE,
1613 &bad_lba);
1614 if (!info_valid)
1615 return 0;
1616
1617 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1618 return 0;
1619
1620 if (scmd->device->sector_size < 512) {
1621 /* only legitimate sector_size here is 256 */
1622 start_lba <<= 1;
1623 end_lba <<= 1;
1624 } else {
1625 /* be careful ... don't want any overflows */
ef80d1e1 1626 unsigned int factor = scmd->device->sector_size / 512;
af55ff67
MP		 1627 do_div(start_lba, factor);
1628 do_div(end_lba, factor);
1629 }
1630
1631 /* The bad lba was reported incorrectly, we have no idea where
1632 * the error is.
1633 */
1634 if (bad_lba < start_lba || bad_lba >= end_lba)
1635 return 0;
1636
1637 /* This computation should always be done in terms of
1638 * the resolution of the device's medium.
1639 */
a8733c7b
JB		 1640 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1641 return min(good_bytes, transferred);
af55ff67
MP		 1642}
1643
1da177e4 1644/**
7b3d9545 1645 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1646 * driver has completed (successfully or otherwise) a scsi command.
1647 * @SCpnt: mid-level's per command structure.
1648 *
1649 * Note: potentially run from within an ISR. Must not block.
1650 **/
7b3d9545 1651static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1652{
1653 int result = SCpnt->result;
af55ff67 1654 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1655 struct scsi_sense_hdr sshdr;
4e7392ec 1656 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1657 struct request *req = SCpnt->request;
1da177e4
LT		 1658 int sense_valid = 0;
1659 int sense_deferred = 0;
c98a0eb0 1660 unsigned char op = SCpnt->cmnd[0];
5db44863 1661 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1662
5db44863 1663 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1664 if (!result) {
1665 good_bytes = blk_rq_bytes(req);
1666 scsi_set_resid(SCpnt, 0);
1667 } else {
1668 good_bytes = 0;
1669 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1670 }
1671 }
6a32a8ae 1672
1da177e4
LT		 1673 if (result) {
1674 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1675 if (sense_valid)
1676 sense_deferred = scsi_sense_is_deferred(&sshdr);
1677 }
1da177e4 1678#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1679 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1680 if (sense_valid) {
fa0d34be 1681 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1682 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1683 "ascq]=%x,%x,%x,%x\n",
1684 sshdr.response_code,
1685 sshdr.sense_key, sshdr.asc,
1686 sshdr.ascq));
1da177e4
LT		 1687 }
1688#endif
2a863ba8
DJ		 1689 sdkp->medium_access_timed_out = 0;
1690
03aba2f7
LT		 1691 if (driver_byte(result) != DRIVER_SENSE &&
1692 (!sense_valid || sense_deferred))
1693 goto out;
1694
1695 switch (sshdr.sense_key) {
1696 case HARDWARE_ERROR:
1697 case MEDIUM_ERROR:
af55ff67 1698 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1699 break;
1700 case RECOVERED_ERROR:
af55ff67
MP		 1701 good_bytes = scsi_bufflen(SCpnt);
1702 break;
10dab226
JW		 1703 case NO_SENSE:
1704 /* This indicates a false check condition, so ignore it. An
1705 * unknown amount of data was transferred so treat it as an
1706 * error.
1707 */
1708 scsi_print_sense("sd", SCpnt);
1709 SCpnt->result = 0;
1710 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1711 break;
c98a0eb0
MP		 1712 case ABORTED_COMMAND:
1713 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1714 good_bytes = sd_completed_bytes(SCpnt);
1715 break;
1716 case ILLEGAL_REQUEST:
1717 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1718 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1719 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1720 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1721 switch (op) {
1722 case UNMAP:
1723 sd_config_discard(sdkp, SD_LBP_DISABLE);
1724 break;
1725 case WRITE_SAME_16:
1726 case WRITE_SAME:
1727 if (unmap)
1728 sd_config_discard(sdkp, SD_LBP_DISABLE);
1729 else {
1730 sdkp->device->no_write_same = 1;
1731 sd_config_write_same(sdkp);
1732
1733 good_bytes = 0;
1734 req->__data_len = blk_rq_bytes(req);
1735 req->cmd_flags |= REQ_QUIET;
1736 }
1737 }
1738 }
03aba2f7
LT		 1739 break;
1740 default:
1741 break;
1da177e4 1742 }
03aba2f7 1743 out:
af55ff67
MP		 1744 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1745 sd_dif_complete(SCpnt, good_bytes);
1746
7b3d9545 1747 return good_bytes;
1da177e4
LT		 1748}
1749
1da177e4
LT		 1750/*
1751 * spinup disk - called only in sd_revalidate_disk()
1752 */
1753static void
e73aec82 1754sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1755{
1da177e4 1756 unsigned char cmd[10];
4451e472 1757 unsigned long spintime_expire = 0;
1da177e4
LT		 1758 int retries, spintime;
1759 unsigned int the_result;
1760 struct scsi_sense_hdr sshdr;
1761 int sense_valid = 0;
1762
1763 spintime = 0;
1764
1765 /* Spin up drives, as required. Only do this at boot time */
1766 /* Spinup needs to be done for module loads too. */
1767 do {
1768 retries = 0;
1769
1770 do {
1771 cmd[0] = TEST_UNIT_READY;
1772 memset((void *) &cmd[1], 0, 9);
1773
ea73a9f2
JB		 1774 the_result = scsi_execute_req(sdkp->device, cmd,
1775 DMA_NONE, NULL, 0,
1776 &sshdr, SD_TIMEOUT,
f4f4e47e 1777 SD_MAX_RETRIES, NULL);
1da177e4 1778
b4d38e38
AS		 1779 /*
1780 * If the drive has indicated to us that it
1781 * doesn't have any media in it, don't bother
1782 * with any more polling.
1783 */
1784 if (media_not_present(sdkp, &sshdr))
1785 return;
1786
1da177e4 1787 if (the_result)
ea73a9f2 1788 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1789 retries++;
1790 } while (retries < 3 &&
1791 (!scsi_status_is_good(the_result) ||
1792 ((driver_byte(the_result) & DRIVER_SENSE) &&
1793 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1794
1da177e4
LT		 1795 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1796 /* no sense, TUR either succeeded or failed
1797 * with a status error */
e73aec82
MP		 1798 if(!spintime && !scsi_status_is_good(the_result)) {
1799 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1800 sd_print_result(sdkp, the_result);
1801 }
1da177e4
LT		 1802 break;
1803 }
1804
1805 /*
1806 * The device does not want the automatic start to be issued.
1807 */
33dd6f92 1808 if (sdkp->device->no_start_on_add)
1da177e4 1809 break;
1da177e4 1810
33dd6f92
MW		 1811 if (sense_valid && sshdr.sense_key == NOT_READY) {
1812 if (sshdr.asc == 4 && sshdr.ascq == 3)
1813 break; /* manual intervention required */
1814 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1815 break; /* standby */
1816 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1817 break; /* unavailable */
1818 /*
1819 * Issue command to spin up drive when not ready
1820 */
1da177e4 1821 if (!spintime) {
e73aec82 1822 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1823 cmd[0] = START_STOP;
1824 cmd[1] = 1; /* Return immediately */
1825 memset((void *) &cmd[2], 0, 8);
1826 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1827 if (sdkp->device->start_stop_pwr_cond)
1828 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1829 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1830 NULL, 0, &sshdr,
f4f4e47e
FT		 1831 SD_TIMEOUT, SD_MAX_RETRIES,
1832 NULL);
4451e472
AS		 1833 spintime_expire = jiffies + 100 * HZ;
1834 spintime = 1;
1da177e4 1835 }
1da177e4
LT		 1836 /* Wait 1 second for next try */
1837 msleep(1000);
1838 printk(".");
4451e472
AS		 1839
1840 /*
1841 * Wait for USB flash devices with slow firmware.
1842 * Yes, this sense key/ASC combination shouldn't
1843 * occur here. It's characteristic of these devices.
1844 */
1845 } else if (sense_valid &&
1846 sshdr.sense_key == UNIT_ATTENTION &&
1847 sshdr.asc == 0x28) {
1848 if (!spintime) {
1849 spintime_expire = jiffies + 5 * HZ;
1850 spintime = 1;
1851 }
1852 /* Wait 1 second for next try */
1853 msleep(1000);
1da177e4
LT		 1854 } else {
1855 /* we don't understand the sense code, so it's
1856 * probably pointless to loop */
1857 if(!spintime) {
e73aec82
MP		 1858 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1859 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1860 }
1861 break;
1862 }
1863
4451e472 1864 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1865
1866 if (spintime) {
1867 if (scsi_status_is_good(the_result))
1868 printk("ready\n");
1869 else
1870 printk("not responding...\n");
1871 }
1872}
1873
e0597d70
MP		 1874
1875/*
1876 * Determine whether disk supports Data Integrity Field.
1877 */
fe542396 1878static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1879{
1880 struct scsi_device *sdp = sdkp->device;
1881 u8 type;
fe542396 1882 int ret = 0;
e0597d70
MP		 1883
1884 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1885 return ret;
35e1a5d9
MP		 1886
1887 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1888
fe542396
MP		 1889 if (type > SD_DIF_TYPE3_PROTECTION)
1890 ret = -ENODEV;
1891 else if (scsi_host_dif_capable(sdp->host, type))
1892 ret = 1;
1893
1894 if (sdkp->first_scan || type != sdkp->protection_type)
1895 switch (ret) {
1896 case -ENODEV:
1897 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1898 " protection type %u. Disabling disk!\n",
1899 type);
1900 break;
1901 case 1:
1902 sd_printk(KERN_NOTICE, sdkp,
1903 "Enabling DIF Type %u protection\n", type);
1904 break;
1905 case 0:
1906 sd_printk(KERN_NOTICE, sdkp,
1907 "Disabling DIF Type %u protection\n", type);
1908 break;
1909 }
e0597d70 1910
be922f47
MP		 1911 sdkp->protection_type = type;
1912
fe542396 1913 return ret;
e0597d70
MP		 1914}
1915
0da205e0
MW		 1916static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1917 struct scsi_sense_hdr *sshdr, int sense_valid,
1918 int the_result)
1919{
1920 sd_print_result(sdkp, the_result);
1921 if (driver_byte(the_result) & DRIVER_SENSE)
1922 sd_print_sense_hdr(sdkp, sshdr);
1923 else
1924 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1925
1926 /*
1927 * Set dirty bit for removable devices if not ready -
1928 * sometimes drives will not report this properly.
1929 */
1930 if (sdp->removable &&
1931 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1932 set_media_not_present(sdkp);
0da205e0
MW		 1933
1934 /*
1935 * We used to set media_present to 0 here to indicate no media
1936 * in the drive, but some drives fail read capacity even with
1937 * media present, so we can't do that.
1938 */
1939 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1940}
1941
1942#define RC16_LEN 32
1943#if RC16_LEN > SD_BUF_SIZE
1944#error RC16_LEN must not be more than SD_BUF_SIZE
1945#endif
1946
3233ac19
JB		 1947#define READ_CAPACITY_RETRIES_ON_RESET 10
1948
0da205e0
MW		 1949static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1950 unsigned char *buffer)
ea73a9f2 1951{
1da177e4 1952 unsigned char cmd[16];
1da177e4
LT		 1953 struct scsi_sense_hdr sshdr;
1954 int sense_valid = 0;
0da205e0 1955 int the_result;
3233ac19 1956 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1957 unsigned int alignment;
0da205e0
MW		 1958 unsigned long long lba;
1959 unsigned sector_size;
1da177e4 1960
5ce524bd
HG		 1961 if (sdp->no_read_capacity_16)
1962 return -EINVAL;
1963
1da177e4 1964 do {
0da205e0
MW		 1965 memset(cmd, 0, 16);
1966 cmd[0] = SERVICE_ACTION_IN;
1967 cmd[1] = SAI_READ_CAPACITY_16;
1968 cmd[13] = RC16_LEN;
1969 memset(buffer, 0, RC16_LEN);
1970
ea73a9f2 1971 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1972 buffer, RC16_LEN, &sshdr,
1973 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1974
ea73a9f2 1975 if (media_not_present(sdkp, &sshdr))
0da205e0 1976 return -ENODEV;
1da177e4 1977
2b301307 1978 if (the_result) {
ea73a9f2 1979 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1980 if (sense_valid &&
1981 sshdr.sense_key == ILLEGAL_REQUEST &&
1982 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1983 sshdr.ascq == 0x00)
1984 /* Invalid Command Operation Code or
1985 * Invalid Field in CDB, just retry
1986 * silently with RC10 */
1987 return -EINVAL;
3233ac19
JB		 1988 if (sense_valid &&
1989 sshdr.sense_key == UNIT_ATTENTION &&
1990 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1991 /* Device reset might occur several times,
1992 * give it one more chance */
1993 if (--reset_retries > 0)
1994 continue;
2b301307 1995 }
1da177e4
LT		 1996 retries--;
1997
1998 } while (the_result && retries);
1999
0da205e0 2000 if (the_result) {
e73aec82 2001 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 2002 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2003 return -EINVAL;
2004 }
e73aec82 2005
8f76d151
DH		 2006 sector_size = get_unaligned_be32(&buffer[8]);
2007 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2008
fe542396
MP		 2009 if (sd_read_protection_type(sdkp, buffer) < 0) {
2010 sdkp->capacity = 0;
2011 return -ENODEV;
2012 }
0da205e0
MW		 2013
2014 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2015 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2016 "kernel compiled with support for large block "
2017 "devices.\n");
2018 sdkp->capacity = 0;
2019 return -EOVERFLOW;
2020 }
2021
ea09bcc9 2022 /* Logical blocks per physical block exponent */
526f7c79 2023 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2024
2025 /* Lowest aligned logical block */
2026 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2027 blk_queue_alignment_offset(sdp->request_queue, alignment);
2028 if (alignment && sdkp->first_scan)
2029 sd_printk(KERN_NOTICE, sdkp,
2030 "physical block alignment offset: %u\n", alignment);
2031
c98a0eb0
MP		 2032 if (buffer[14] & 0x80) { /* LBPME */
2033 sdkp->lbpme = 1;
e339c1a7 2034
c98a0eb0
MP		 2035 if (buffer[14] & 0x40) /* LBPRZ */
2036 sdkp->lbprz = 1;
e339c1a7 2037
c98a0eb0 2038 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2039 }
2040
0da205e0
MW		 2041 sdkp->capacity = lba + 1;
2042 return sector_size;
2043}
2044
2045static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2046 unsigned char *buffer)
2047{
2048 unsigned char cmd[16];
2049 struct scsi_sense_hdr sshdr;
2050 int sense_valid = 0;
2051 int the_result;
3233ac19 2052 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2053 sector_t lba;
2054 unsigned sector_size;
2055
2056 do {
2057 cmd[0] = READ_CAPACITY;
2058 memset(&cmd[1], 0, 9);
2059 memset(buffer, 0, 8);
2060
2061 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2062 buffer, 8, &sshdr,
2063 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2064
2065 if (media_not_present(sdkp, &sshdr))
2066 return -ENODEV;
2067
3233ac19 2068 if (the_result) {
0da205e0 2069 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2070 if (sense_valid &&
2071 sshdr.sense_key == UNIT_ATTENTION &&
2072 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2073 /* Device reset might occur several times,
2074 * give it one more chance */
2075 if (--reset_retries > 0)
2076 continue;
2077 }
0da205e0
MW		 2078 retries--;
2079
2080 } while (the_result && retries);
2081
2082 if (the_result) {
2083 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2084 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2085 return -EINVAL;
2086 }
2087
8f76d151
DH		 2088 sector_size = get_unaligned_be32(&buffer[4]);
2089 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2090
5ce524bd
HG		 2091 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2092 /* Some buggy (usb cardreader) devices return an lba of
2093 0xffffffff when the want to report a size of 0 (with
2094 which they really mean no media is present) */
2095 sdkp->capacity = 0;
5cc10350 2096 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2097 return sector_size;
2098 }
2099
0da205e0
MW		 2100 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2101 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2102 "kernel compiled with support for large block "
2103 "devices.\n");
2104 sdkp->capacity = 0;
2105 return -EOVERFLOW;
2106 }
2107
2108 sdkp->capacity = lba + 1;
526f7c79 2109 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2110 return sector_size;
2111}
2112
2b301307
MW		 2113static int sd_try_rc16_first(struct scsi_device *sdp)
2114{
f87146bb
HR		 2115 if (sdp->host->max_cmd_len < 16)
2116 return 0;
6a0bdffa
AS		 2117 if (sdp->try_rc_10_first)
2118 return 0;
2b301307
MW		 2119 if (sdp->scsi_level > SCSI_SPC_2)
2120 return 1;
2121 if (scsi_device_protection(sdp))
2122 return 1;
2123 return 0;
2124}
2125
0da205e0
MW		 2126/*
2127 * read disk capacity
2128 */
2129static void
2130sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2131{
2132 int sector_size;
2133 struct scsi_device *sdp = sdkp->device;
70a9b873 2134 sector_t old_capacity = sdkp->capacity;
0da205e0 2135
2b301307 2136 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2137 sector_size = read_capacity_16(sdkp, sdp, buffer);
2138 if (sector_size == -EOVERFLOW)
1da177e4 2139 goto got_data;
2b301307
MW		 2140 if (sector_size == -ENODEV)
2141 return;
2142 if (sector_size < 0)
2143 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2144 if (sector_size < 0)
2145 return;
1da177e4 2146 } else {
0da205e0
MW		 2147 sector_size = read_capacity_10(sdkp, sdp, buffer);
2148 if (sector_size == -EOVERFLOW)
2149 goto got_data;
2150 if (sector_size < 0)
2151 return;
2152 if ((sizeof(sdkp->capacity) > 4) &&
2153 (sdkp->capacity > 0xffffffffULL)) {
2154 int old_sector_size = sector_size;
2155 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2156 "Trying to use READ CAPACITY(16).\n");
2157 sector_size = read_capacity_16(sdkp, sdp, buffer);
2158 if (sector_size < 0) {
2159 sd_printk(KERN_NOTICE, sdkp,
2160 "Using 0xffffffff as device size\n");
2161 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2162 sector_size = old_sector_size;
2163 goto got_data;
2164 }
2165 }
2166 }
1da177e4 2167
5c211caa
AS		 2168 /* Some devices are known to return the total number of blocks,
2169 * not the highest block number. Some devices have versions
2170 * which do this and others which do not. Some devices we might
2171 * suspect of doing this but we don't know for certain.
2172 *
2173 * If we know the reported capacity is wrong, decrement it. If
2174 * we can only guess, then assume the number of blocks is even
2175 * (usually true but not always) and err on the side of lowering
2176 * the capacity.
2177 */
2178 if (sdp->fix_capacity ||
2179 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2180 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2181 "from its reported value: %llu\n",
2182 (unsigned long long) sdkp->capacity);
1da177e4 2183 --sdkp->capacity;
61bf54b7
ON		 2184 }
2185
1da177e4
LT		 2186got_data:
2187 if (sector_size == 0) {
2188 sector_size = 512;
e73aec82
MP		 2189 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2190 "assuming 512.\n");
1da177e4
LT		 2191 }
2192
2193 if (sector_size != 512 &&
2194 sector_size != 1024 &&
2195 sector_size != 2048 &&
2196 sector_size != 4096 &&
2197 sector_size != 256) {
e73aec82
MP		 2198 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2199 sector_size);
1da177e4
LT		 2200 /*
2201 * The user might want to re-format the drive with
2202 * a supported sectorsize. Once this happens, it
2203 * would be relatively trivial to set the thing up.
2204 * For this reason, we leave the thing in the table.
2205 */
2206 sdkp->capacity = 0;
2207 /*
2208 * set a bogus sector size so the normal read/write
2209 * logic in the block layer will eventually refuse any
2210 * request on this device without tripping over power
2211 * of two sector size assumptions
2212 */
2213 sector_size = 512;
2214 }
e1defc4f 2215 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2216
1da177e4 2217 {
7404ad3b 2218 char cap_str_2[10], cap_str_10[10];
520a2c27 2219 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2220
7404ad3b
JB		 2221 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2222 sizeof(cap_str_2));
2223 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2224 sizeof(cap_str_10));
1da177e4 2225
ea09bcc9 2226 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2227 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2228 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2229 (unsigned long long)sdkp->capacity,
2230 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2231
526f7c79 2232 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2233 sd_printk(KERN_NOTICE, sdkp,
2234 "%u-byte physical blocks\n",
526f7c79 2235 sdkp->physical_block_size);
ea09bcc9 2236 }
1da177e4
LT		 2237 }
2238
53ad570b
JH		 2239 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2240
1da177e4
LT		 2241 /* Rescale capacity to 512-byte units */
2242 if (sector_size == 4096)
2243 sdkp->capacity <<= 3;
2244 else if (sector_size == 2048)
2245 sdkp->capacity <<= 2;
2246 else if (sector_size == 1024)
2247 sdkp->capacity <<= 1;
2248 else if (sector_size == 256)
2249 sdkp->capacity >>= 1;
2250
526f7c79
MP		 2251 blk_queue_physical_block_size(sdp->request_queue,
2252 sdkp->physical_block_size);
1da177e4
LT		 2253 sdkp->device->sector_size = sector_size;
2254}
2255
2256/* called with buffer of length 512 */
2257static inline int
ea73a9f2
JB		 2258sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2259 unsigned char *buffer, int len, struct scsi_mode_data *data,
2260 struct scsi_sense_hdr *sshdr)
1da177e4 2261{
ea73a9f2 2262 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2263 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2264 sshdr);
1da177e4
LT		 2265}
2266
2267/*
2268 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2269 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2270 */
2271static void
e73aec82 2272sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2273{
1da177e4 2274 int res;
ea73a9f2 2275 struct scsi_device *sdp = sdkp->device;
1da177e4 2276 struct scsi_mode_data data;
70a9b873 2277 int old_wp = sdkp->write_prot;
1da177e4
LT		 2278
2279 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2280 if (sdp->skip_ms_page_3f) {
b2bff6ce 2281 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2282 return;
2283 }
2284
ea73a9f2
JB		 2285 if (sdp->use_192_bytes_for_3f) {
2286 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2287 } else {
2288 /*
2289 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2290 * We have to start carefully: some devices hang if we ask
2291 * for more than is available.
2292 */
ea73a9f2 2293 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2294
2295 /*
2296 * Second attempt: ask for page 0 When only page 0 is
2297 * implemented, a request for page 3F may return Sense Key
2298 * 5: Illegal Request, Sense Code 24: Invalid field in
2299 * CDB.
2300 */
2301 if (!scsi_status_is_good(res))
ea73a9f2 2302 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2303
2304 /*
2305 * Third attempt: ask 255 bytes, as we did earlier.
2306 */
2307 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2308 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2309 &data, NULL);
1da177e4
LT		 2310 }
2311
2312 if (!scsi_status_is_good(res)) {
b2bff6ce 2313 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2314 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2315 } else {
2316 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2317 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2318 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2319 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2320 sdkp->write_prot ? "on" : "off");
2321 sd_printk(KERN_DEBUG, sdkp,
2322 "Mode Sense: %02x %02x %02x %02x\n",
2323 buffer[0], buffer[1], buffer[2], buffer[3]);
2324 }
1da177e4
LT		 2325 }
2326}
2327
2328/*
2329 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2330 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2331 */
2332static void
e73aec82 2333sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2334{
1da177e4 2335 int len = 0, res;
ea73a9f2 2336 struct scsi_device *sdp = sdkp->device;
1da177e4 2337
631e8a13
AV		 2338 int dbd;
2339 int modepage;
0bcaa111 2340 int first_len;
1da177e4
LT		 2341 struct scsi_mode_data data;
2342 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2343 int old_wce = sdkp->WCE;
2344 int old_rcd = sdkp->RCD;
2345 int old_dpofua = sdkp->DPOFUA;
1da177e4 2346
39c60a09
JB		 2347
2348 if (sdkp->cache_override)
2349 return;
2350
0bcaa111
LT		 2351 first_len = 4;
2352 if (sdp->skip_ms_page_8) {
2353 if (sdp->type == TYPE_RBC)
2354 goto defaults;
2355 else {
2356 if (sdp->skip_ms_page_3f)
2357 goto defaults;
2358 modepage = 0x3F;
2359 if (sdp->use_192_bytes_for_3f)
2360 first_len = 192;
2361 dbd = 0;
2362 }
2363 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2364 modepage = 6;
2365 dbd = 8;
2366 } else {
2367 modepage = 8;
2368 dbd = 0;
2369 }
2370
1da177e4 2371 /* cautiously ask */
0bcaa111
LT		 2372 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2373 &data, &sshdr);
1da177e4
LT		 2374
2375 if (!scsi_status_is_good(res))
2376 goto bad_sense;
2377
6d73c851
AV		 2378 if (!data.header_length) {
2379 modepage = 6;
0bcaa111 2380 first_len = 0;
b2bff6ce
MP		 2381 sd_first_printk(KERN_ERR, sdkp,
2382 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2383 }
2384
1da177e4
LT		 2385 /* that went OK, now ask for the proper length */
2386 len = data.length;
2387
2388 /*
2389 * We're only interested in the first three bytes, actually.
2390 * But the data cache page is defined for the first 20.
2391 */
2392 if (len < 3)
2393 goto bad_sense;
0bcaa111 2394 else if (len > SD_BUF_SIZE) {
b2bff6ce 2395 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2396 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2397 len = SD_BUF_SIZE;
2398 }
2399 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2400 len = 192;
1da177e4
LT		 2401
2402 /* Get the data */
0bcaa111
LT		 2403 if (len > first_len)
2404 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2405 &data, &sshdr);
1da177e4
LT		 2406
2407 if (scsi_status_is_good(res)) {
631e8a13 2408 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2409
0bcaa111
LT		 2410 while (offset < len) {
2411 u8 page_code = buffer[offset] & 0x3F;
2412 u8 spf = buffer[offset] & 0x40;
2413
2414 if (page_code == 8 || page_code == 6) {
2415 /* We're interested only in the first 3 bytes.
2416 */
2417 if (len - offset <= 2) {
b2bff6ce
MP		 2418 sd_first_printk(KERN_ERR, sdkp,
2419 "Incomplete mode parameter "
2420 "data\n");
0bcaa111
LT		 2421 goto defaults;
2422 } else {
2423 modepage = page_code;
2424 goto Page_found;
2425 }
2426 } else {
2427 /* Go to the next page */
2428 if (spf && len - offset > 3)
2429 offset += 4 + (buffer[offset+2] << 8) +
2430 buffer[offset+3];
2431 else if (!spf && len - offset > 1)
2432 offset += 2 + buffer[offset+1];
2433 else {
b2bff6ce
MP		 2434 sd_first_printk(KERN_ERR, sdkp,
2435 "Incomplete mode "
2436 "parameter data\n");
0bcaa111
LT		 2437 goto defaults;
2438 }
2439 }
48970800
AV		 2440 }
2441
b2bff6ce 2442 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2443 goto defaults;
2444
0bcaa111 2445 Page_found:
631e8a13
AV		 2446 if (modepage == 8) {
2447 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2448 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2449 } else {
2450 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2451 sdkp->RCD = 0;
2452 }
1da177e4 2453
007365ad 2454 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2455 if (sdp->broken_fua) {
2456 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2457 sdkp->DPOFUA = 0;
2458 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
b2bff6ce 2459 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2460 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2461 sdkp->DPOFUA = 0;
2462 }
2463
70a9b873
MP		 2464 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2465 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2466 sd_printk(KERN_NOTICE, sdkp,
2467 "Write cache: %s, read cache: %s, %s\n",
2468 sdkp->WCE ? "enabled" : "disabled",
2469 sdkp->RCD ? "disabled" : "enabled",
2470 sdkp->DPOFUA ? "supports DPO and FUA"
2471 : "doesn't support DPO or FUA");
1da177e4
LT		 2472
2473 return;
2474 }
2475
2476bad_sense:
ea73a9f2 2477 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2478 sshdr.sense_key == ILLEGAL_REQUEST &&
2479 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2480 /* Invalid field in CDB */
b2bff6ce 2481 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2482 else
b2bff6ce
MP		 2483 sd_first_printk(KERN_ERR, sdkp,
2484 "Asking for cache data failed\n");
1da177e4
LT		 2485
2486defaults:
b81478d8 2487 if (sdp->wce_default_on) {
b2bff6ce
MP		 2488 sd_first_printk(KERN_NOTICE, sdkp,
2489 "Assuming drive cache: write back\n");
b81478d8
NJ		 2490 sdkp->WCE = 1;
2491 } else {
b2bff6ce
MP		 2492 sd_first_printk(KERN_ERR, sdkp,
2493 "Assuming drive cache: write through\n");
b81478d8
NJ		 2494 sdkp->WCE = 0;
2495 }
1da177e4 2496 sdkp->RCD = 0;
48970800 2497 sdkp->DPOFUA = 0;
1da177e4
LT		 2498}
2499
e0597d70
MP		 2500/*
2501 * The ATO bit indicates whether the DIF application tag is available
2502 * for use by the operating system.
2503 */
439d77f7 2504static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2505{
2506 int res, offset;
2507 struct scsi_device *sdp = sdkp->device;
2508 struct scsi_mode_data data;
2509 struct scsi_sense_hdr sshdr;
2510
2511 if (sdp->type != TYPE_DISK)
2512 return;
2513
2514 if (sdkp->protection_type == 0)
2515 return;
2516
2517 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2518 SD_MAX_RETRIES, &data, &sshdr);
2519
2520 if (!scsi_status_is_good(res) || !data.header_length ||
2521 data.length < 6) {
b2bff6ce 2522 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2523 "getting Control mode page failed, assume no ATO\n");
2524
2525 if (scsi_sense_valid(&sshdr))
2526 sd_print_sense_hdr(sdkp, &sshdr);
2527
2528 return;
2529 }
2530
2531 offset = data.header_length + data.block_descriptor_length;
2532
2533 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2534 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2535 return;
2536 }
2537
2538 if ((buffer[offset + 5] & 0x80) == 0)
2539 return;
2540
2541 sdkp->ATO = 1;
2542
2543 return;
2544}
2545
d11b6916
MP		 2546/**
2547 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2548 * @disk: disk to query
2549 */
2550static void sd_read_block_limits(struct scsi_disk *sdkp)
2551{
2552 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2553 const int vpd_len = 64;
e3deec09 2554 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2555
e3deec09
JB		 2556 if (!buffer ||
2557 /* Block Limits VPD */
2558 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2559 goto out;
d11b6916
MP		 2560
2561 blk_queue_io_min(sdkp->disk->queue,
2562 get_unaligned_be16(&buffer[6]) * sector_sz);
2563 blk_queue_io_opt(sdkp->disk->queue,
2564 get_unaligned_be32(&buffer[12]) * sector_sz);
2565
c98a0eb0
MP		 2566 if (buffer[3] == 0x3c) {
2567 unsigned int lba_count, desc_count;
e339c1a7 2568
5db44863 2569 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2570
c98a0eb0 2571 if (!sdkp->lbpme)
045d3fe7 2572 goto out;
045d3fe7 2573
c98a0eb0
MP		 2574 lba_count = get_unaligned_be32(&buffer[20]);
2575 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2576
c98a0eb0
MP		 2577 if (lba_count && desc_count)
2578 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2579
c98a0eb0 2580 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2581
2582 if (buffer[32] & 0x80)
c98a0eb0 2583 sdkp->unmap_alignment =
e339c1a7 2584 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2585
2586 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2587
2588 if (sdkp->max_unmap_blocks)
2589 sd_config_discard(sdkp, SD_LBP_UNMAP);
2590 else
2591 sd_config_discard(sdkp, SD_LBP_WS16);
2592
2593 } else { /* LBP VPD page tells us what to use */
2594
2595 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2596 sd_config_discard(sdkp, SD_LBP_UNMAP);
2597 else if (sdkp->lbpws)
2598 sd_config_discard(sdkp, SD_LBP_WS16);
2599 else if (sdkp->lbpws10)
2600 sd_config_discard(sdkp, SD_LBP_WS10);
2601 else
2602 sd_config_discard(sdkp, SD_LBP_DISABLE);
2603 }
e339c1a7
MP		 2604 }
2605
e3deec09 2606 out:
d11b6916
MP		 2607 kfree(buffer);
2608}
2609
3821d768
MP		 2610/**
2611 * sd_read_block_characteristics - Query block dev. characteristics
2612 * @disk: disk to query
2613 */
2614static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2615{
e3deec09 2616 unsigned char *buffer;
3821d768 2617 u16 rot;
bb2d3de1 2618 const int vpd_len = 64;
3821d768 2619
e3deec09 2620 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2621
e3deec09
JB		 2622 if (!buffer ||
2623 /* Block Device Characteristics VPD */
2624 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2625 goto out;
3821d768
MP		 2626
2627 rot = get_unaligned_be16(&buffer[4]);
2628
2629 if (rot == 1)
2630 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2631
e3deec09 2632 out:
3821d768
MP		 2633 kfree(buffer);
2634}
2635
045d3fe7 2636/**
c98a0eb0 2637 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2638 * @disk: disk to query
2639 */
c98a0eb0 2640static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2641{
2642 unsigned char *buffer;
2643 const int vpd_len = 8;
2644
c98a0eb0 2645 if (sdkp->lbpme == 0)
045d3fe7
MP		 2646 return;
2647
2648 buffer = kmalloc(vpd_len, GFP_KERNEL);
2649
2650 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2651 goto out;
2652
c98a0eb0
MP		 2653 sdkp->lbpvpd = 1;
2654 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2655 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2656 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2657
2658 out:
2659 kfree(buffer);
2660}
2661
5db44863
MP		 2662static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2663{
66c28f97
MP		 2664 struct scsi_device *sdev = sdkp->device;
2665
54b2b50c
MP		 2666 if (sdev->host->no_write_same) {
2667 sdev->no_write_same = 1;
2668
2669 return;
2670 }
2671
66c28f97 2672 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2673 /* too large values might cause issues with arcmsr */
2674 int vpd_buf_len = 64;
2675
66c28f97
MP		 2676 sdev->no_report_opcodes = 1;
2677
2678 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2679 * CODES is unsupported and the device has an ATA
2680 * Information VPD page (SAT).
2681 */
af73623f 2682 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2683 sdev->no_write_same = 1;
2684 }
2685
2686 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2687 sdkp->ws16 = 1;
66c28f97
MP		 2688
2689 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2690 sdkp->ws10 = 1;
5db44863
MP		 2691}
2692
ffd4bc2a
MP		 2693static int sd_try_extended_inquiry(struct scsi_device *sdp)
2694{
2695 /*
2696 * Although VPD inquiries can go to SCSI-2 type devices,
2697 * some USB ones crash on receiving them, and the pages
2698 * we currently ask for are for SPC-3 and beyond
2699 */
09b6b51b 2700 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2701 return 1;
2702 return 0;
2703}
2704
1da177e4
LT		 2705/**
2706 * sd_revalidate_disk - called the first time a new disk is seen,
2707 * performs disk spin up, read_capacity, etc.
2708 * @disk: struct gendisk we care about
2709 **/
2710static int sd_revalidate_disk(struct gendisk *disk)
2711{
2712 struct scsi_disk *sdkp = scsi_disk(disk);
2713 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 2714 unsigned char *buffer;
2715
fa0d34be
MP		 2716 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2717 "sd_revalidate_disk\n"));
1da177e4
LT		 2718
2719 /*
2720 * If the device is offline, don't try and read capacity or any
2721 * of the other niceties.
2722 */
2723 if (!scsi_device_online(sdp))
2724 goto out;
2725
a6123f14 2726 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2727 if (!buffer) {
e73aec82
MP		 2728 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2729 "allocation failure.\n");
ea73a9f2 2730 goto out;
1da177e4
LT		 2731 }
2732
e73aec82 2733 sd_spinup_disk(sdkp);
1da177e4
LT		 2734
2735 /*
2736 * Without media there is no reason to ask; moreover, some devices
2737 * react badly if we do.
2738 */
2739 if (sdkp->media_present) {
e73aec82 2740 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2741
2742 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2743 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2744 sd_read_block_limits(sdkp);
2745 sd_read_block_characteristics(sdkp);
2746 }
2747
e73aec82
MP		 2748 sd_read_write_protect_flag(sdkp, buffer);
2749 sd_read_cache_type(sdkp, buffer);
e0597d70 2750 sd_read_app_tag_own(sdkp, buffer);
5db44863 2751 sd_read_write_same(sdkp, buffer);
1da177e4 2752 }
461d4e90 2753
70a9b873
MP		 2754 sdkp->first_scan = 0;
2755
461d4e90
TH		 2756 /*
2757 * We now have all cache related info, determine how we deal
4913efe4 2758 * with flush requests.
461d4e90 2759 */
cb2fb68d 2760 sd_set_flush_flag(sdkp);
461d4e90 2761
1da177e4 2762 set_capacity(disk, sdkp->capacity);
5db44863 2763 sd_config_write_same(sdkp);
1da177e4
LT		 2764 kfree(buffer);
2765
1da177e4
LT		 2766 out:
2767 return 0;
2768}
2769
72ec24bd
TH		 2770/**
2771 * sd_unlock_native_capacity - unlock native capacity
2772 * @disk: struct gendisk to set capacity for
2773 *
2774 * Block layer calls this function if it detects that partitions
2775 * on @disk reach beyond the end of the device. If the SCSI host
2776 * implements ->unlock_native_capacity() method, it's invoked to
2777 * give it a chance to adjust the device capacity.
2778 *
2779 * CONTEXT:
2780 * Defined by block layer. Might sleep.
2781 */
2782static void sd_unlock_native_capacity(struct gendisk *disk)
2783{
2784 struct scsi_device *sdev = scsi_disk(disk)->device;
2785
2786 if (sdev->host->hostt->unlock_native_capacity)
2787 sdev->host->hostt->unlock_native_capacity(sdev);
2788}
2789
3e1a7ff8
TH		 2790/**
2791 * sd_format_disk_name - format disk name
2792 * @prefix: name prefix - ie. "sd" for SCSI disks
2793 * @index: index of the disk to format name for
2794 * @buf: output buffer
2795 * @buflen: length of the output buffer
2796 *
2797 * SCSI disk names starts at sda. The 26th device is sdz and the
2798 * 27th is sdaa. The last one for two lettered suffix is sdzz
2799 * which is followed by sdaaa.
2800 *
2801 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2802 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2803 * determined using similar method as 26 base conversion with the
2804 * index shifted -1 after each digit is computed.
2805 *
2806 * CONTEXT:
2807 * Don't care.
2808 *
2809 * RETURNS:
2810 * 0 on success, -errno on failure.
2811 */
2812static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2813{
2814 const int base = 'z' - 'a' + 1;
2815 char *begin = buf + strlen(prefix);
2816 char *end = buf + buflen;
2817 char *p;
2818 int unit;
2819
2820 p = end - 1;
2821 *p = '\0';
2822 unit = base;
2823 do {
2824 if (p == begin)
2825 return -EINVAL;
2826 *--p = 'a' + (index % unit);
2827 index = (index / unit) - 1;
2828 } while (index >= 0);
2829
2830 memmove(begin, p, end - p);
2831 memcpy(buf, prefix, strlen(prefix));
2832
2833 return 0;
2834}
2835
4ace92fc
AV		 2836/*
2837 * The asynchronous part of sd_probe
2838 */
2839static void sd_probe_async(void *data, async_cookie_t cookie)
2840{
2841 struct scsi_disk *sdkp = data;
2842 struct scsi_device *sdp;
2843 struct gendisk *gd;
2844 u32 index;
2845 struct device *dev;
2846
2847 sdp = sdkp->device;
2848 gd = sdkp->disk;
2849 index = sdkp->index;
2850 dev = &sdp->sdev_gendev;
2851
1a03ae0f
MR		 2852 gd->major = sd_major((index & 0xf0) >> 4);
2853 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2854 gd->minors = SD_MINORS;
2855
4ace92fc
AV		 2856 gd->fops = &sd_fops;
2857 gd->private_data = &sdkp->driver;
2858 gd->queue = sdkp->device->request_queue;
2859
70a9b873
MP		 2860 /* defaults, until the device tells us otherwise */
2861 sdp->sector_size = 512;
2862 sdkp->capacity = 0;
2863 sdkp->media_present = 1;
2864 sdkp->write_prot = 0;
39c60a09 2865 sdkp->cache_override = 0;
70a9b873
MP		 2866 sdkp->WCE = 0;
2867 sdkp->RCD = 0;
2868 sdkp->ATO = 0;
2869 sdkp->first_scan = 1;
18a4d0a2 2870 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2871
4ace92fc
AV		 2872 sd_revalidate_disk(gd);
2873
4ace92fc 2874 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2875 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2876 if (sdp->removable) {
4ace92fc 2877 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2878 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2879 }
4ace92fc 2880
10c580e4 2881 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2882 add_disk(gd);
fe542396
MP		 2883 if (sdkp->capacity)
2884 sd_dif_config_host(sdkp);
4ace92fc 2885
3821d768
MP		 2886 sd_revalidate_disk(gd);
2887
4ace92fc
AV		 2888 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2889 sdp->removable ? "removable " : "");
478a8a05 2890 scsi_autopm_put_device(sdp);
ea038f63 2891 put_device(&sdkp->dev);
4ace92fc
AV		 2892}
2893
1da177e4
LT		 2894/**
2895 * sd_probe - called during driver initialization and whenever a
2896 * new scsi device is attached to the system. It is called once
2897 * for each scsi device (not just disks) present.
2898 * @dev: pointer to device object
2899 *
2900 * Returns 0 if successful (or not interested in this scsi device
2901 * (e.g. scanner)); 1 when there is an error.
2902 *
2903 * Note: this function is invoked from the scsi mid-level.
2904 * This function sets up the mapping between a given
2905 * <host,channel,id,lun> (found in sdp) and new device name
2906 * (e.g. /dev/sda). More precisely it is the block device major
2907 * and minor number that is chosen here.
2908 *
2db93ce8
PU		 2909 * Assume sd_probe is not re-entrant (for time being)
2910 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2911 **/
2912static int sd_probe(struct device *dev)
2913{
2914 struct scsi_device *sdp = to_scsi_device(dev);
2915 struct scsi_disk *sdkp;
2916 struct gendisk *gd;
439d77f7 2917 int index;
1da177e4
LT		 2918 int error;
2919
2920 error = -ENODEV;
631e8a13 2921 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2922 goto out;
2923
9ccfc756 2924 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2925 "sd_probe\n"));
1da177e4
LT		 2926
2927 error = -ENOMEM;
24669f75 2928 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2929 if (!sdkp)
2930 goto out;
2931
689d6fac 2932 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2933 if (!gd)
2934 goto out_free;
2935
f27bac27
TH		 2936 do {
2937 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2938 goto out_put;
1da177e4 2939
4034cc68 2940 spin_lock(&sd_index_lock);
f27bac27 2941 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2942 spin_unlock(&sd_index_lock);
f27bac27 2943 } while (error == -EAGAIN);
1da177e4 2944
21208ae5
DK		 2945 if (error) {
2946 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2947 goto out_put;
1a03ae0f
MR		 2948 }
2949
3e1a7ff8 2950 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2951 if (error) {
2952 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2953 goto out_free_index;
21208ae5 2954 }
f27bac27 2955
1da177e4
LT		 2956 sdkp->device = sdp;
2957 sdkp->driver = &sd_template;
2958 sdkp->disk = gd;
2959 sdkp->index = index;
409f3499 2960 atomic_set(&sdkp->openers, 0);
9e1a1537 2961 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2962
601e7638
JB		 2963 if (!sdp->request_queue->rq_timeout) {
2964 if (sdp->type != TYPE_MOD)
2965 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2966 else
2967 blk_queue_rq_timeout(sdp->request_queue,
2968 SD_MOD_TIMEOUT);
2969 }
2970
2971 device_initialize(&sdkp->dev);
478a8a05 2972 sdkp->dev.parent = dev;
601e7638 2973 sdkp->dev.class = &sd_disk_class;
02aa2a37 2974 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638
JB		 2975
2976 if (device_add(&sdkp->dev))
2977 goto out_free_index;
2978
478a8a05
AS		 2979 get_device(dev);
2980 dev_set_drvdata(dev, sdkp);
601e7638 2981
ea038f63 2982 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2983 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2984
2985 return 0;
2986
f27bac27 2987 out_free_index:
4034cc68 2988 spin_lock(&sd_index_lock);
f27bac27 2989 ida_remove(&sd_index_ida, index);
4034cc68 2990 spin_unlock(&sd_index_lock);
6bdaa1f1 2991 out_put:
1da177e4 2992 put_disk(gd);
6bdaa1f1 2993 out_free:
1da177e4 2994 kfree(sdkp);
6bdaa1f1 2995 out:
1da177e4
LT		 2996 return error;
2997}
2998
2999/**
3000 * sd_remove - called whenever a scsi disk (previously recognized by
3001 * sd_probe) is detached from the system. It is called (potentially
3002 * multiple times) during sd module unload.
3003 * @sdp: pointer to mid level scsi device object
3004 *
3005 * Note: this function is invoked from the scsi mid-level.
3006 * This function potentially frees up a device name (e.g. /dev/sdc)
3007 * that could be re-used by a subsequent sd_probe().
3008 * This function is not called when the built-in sd driver is "exit-ed".
3009 **/
3010static int sd_remove(struct device *dev)
3011{
601e7638 3012 struct scsi_disk *sdkp;
0761df9c 3013 dev_t devt;
1da177e4 3014
601e7638 3015 sdkp = dev_get_drvdata(dev);
0761df9c 3016 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3017 scsi_autopm_get_device(sdkp->device);
3018
3c31b52f 3019 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3020 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3021 device_del(&sdkp->dev);
1da177e4
LT		 3022 del_gendisk(sdkp->disk);
3023 sd_shutdown(dev);
39b7f1e2 3024
0761df9c
HR		 3025 blk_register_region(devt, SD_MINORS, NULL,
3026 sd_default_probe, NULL, NULL);
3027
0b950672 3028 mutex_lock(&sd_ref_mutex);
39b7f1e2 3029 dev_set_drvdata(dev, NULL);
ee959b00 3030 put_device(&sdkp->dev);
0b950672 3031 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3032
3033 return 0;
3034}
3035
3036/**
3037 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3038 * @dev: pointer to embedded class device
1da177e4 3039 *
0b950672 3040 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3041 * called on last put, you should always use the scsi_disk_get()
3042 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3043 * and never do a direct put_device.
1da177e4 3044 **/
ee959b00 3045static void scsi_disk_release(struct device *dev)
1da177e4 3046{
ee959b00 3047 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3048 struct gendisk *disk = sdkp->disk;
3049
4034cc68 3050 spin_lock(&sd_index_lock);
f27bac27 3051 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3052 spin_unlock(&sd_index_lock);
1da177e4
LT		 3053
3054 disk->private_data = NULL;
1da177e4 3055 put_disk(disk);
39b7f1e2 3056 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3057
3058 kfree(sdkp);
3059}
3060
cc5d2c8c 3061static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3062{
3063 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3064 struct scsi_sense_hdr sshdr;
cc5d2c8c 3065 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3066 int res;
3067
3068 if (start)
3069 cmd[4] |= 1; /* START */
3070
d2886ea3
SR		 3071 if (sdp->start_stop_pwr_cond)
3072 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3073
c3c94c5a
TH		 3074 if (!scsi_device_online(sdp))
3075 return -ENODEV;
3076
9b21493c
LM		 3077 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3078 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3079 if (res) {
cc5d2c8c
JB		 3080 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3081 sd_print_result(sdkp, res);
c3c94c5a 3082 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3083 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3084 if (scsi_sense_valid(&sshdr) &&
3085 /* 0x3a is medium not present */
3086 sshdr.asc == 0x3a)
3087 res = 0;
c3c94c5a
TH		 3088 }
3089
95897910
ON		 3090 /* SCSI error codes must not go to the generic layer */
3091 if (res)
3092 return -EIO;
3093
3094 return 0;
c3c94c5a
TH		 3095}
3096
1da177e4
LT		 3097/*
3098 * Send a SYNCHRONIZE CACHE instruction down to the device through
3099 * the normal SCSI command structure. Wait for the command to
3100 * complete.
3101 */
3102static void sd_shutdown(struct device *dev)
3103{
39b7f1e2 3104 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3105
3106 if (!sdkp)
3107 return; /* this can happen */
3108
54f57588
LM		 3109 if (pm_runtime_suspended(dev))
3110 goto exit;
3111
95897910 3112 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3113 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3114 sd_sync_cache(sdkp);
39b7f1e2 3115 }
c3c94c5a 3116
cc5d2c8c
JB		 3117 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3118 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3119 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3120 }
3121
54f57588 3122exit:
39b7f1e2
AS		 3123 scsi_disk_put(sdkp);
3124}
1da177e4 3125
95897910 3126static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3127{
c3c94c5a 3128 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3129 int ret = 0;
c3c94c5a
TH		 3130
3131 if (!sdkp)
3132 return 0; /* this can happen */
3133
95897910 3134 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3135 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3136 ret = sd_sync_cache(sdkp);
95897910
ON		 3137 if (ret) {
3138 /* ignore OFFLINE device */
3139 if (ret == -ENODEV)
3140 ret = 0;
09ff92fe 3141 goto done;
95897910 3142 }
c3c94c5a
TH		 3143 }
3144
691e3d31 3145 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3146 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3147 /* an error is not worth aborting a system sleep */
cc5d2c8c 3148 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3149 if (ignore_stop_errors)
3150 ret = 0;
c3c94c5a
TH		 3151 }
3152
09ff92fe
AS		 3153done:
3154 scsi_disk_put(sdkp);
3155 return ret;
c3c94c5a
TH		 3156}
3157
95897910
ON		 3158static int sd_suspend_system(struct device *dev)
3159{
3160 return sd_suspend_common(dev, true);
3161}
3162
3163static int sd_suspend_runtime(struct device *dev)
3164{
3165 return sd_suspend_common(dev, false);
3166}
3167
c3c94c5a
TH		 3168static int sd_resume(struct device *dev)
3169{
c3c94c5a 3170 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3171 int ret = 0;
c3c94c5a 3172
cc5d2c8c 3173 if (!sdkp->device->manage_start_stop)
09ff92fe 3174 goto done;
c3c94c5a 3175
cc5d2c8c 3176 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3177 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3178
09ff92fe
AS		 3179done:
3180 scsi_disk_put(sdkp);
3181 return ret;
c3c94c5a
TH		 3182}
3183
1da177e4
LT		 3184/**
3185 * init_sd - entry point for this driver (both when built in or when
3186 * a module).
3187 *
3188 * Note: this function registers this driver with the scsi mid-level.
3189 **/
3190static int __init init_sd(void)
3191{
5e4009ba 3192 int majors = 0, i, err;
1da177e4
LT		 3193
3194 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3195
0761df9c
HR		 3196 for (i = 0; i < SD_MAJORS; i++) {
3197 if (register_blkdev(sd_major(i), "sd") != 0)
3198 continue;
3199 majors++;
3200 blk_register_region(sd_major(i), SD_MINORS, NULL,
3201 sd_default_probe, NULL, NULL);
3202 }
1da177e4
LT		 3203
3204 if (!majors)
3205 return -ENODEV;
3206
5e4009ba
JG		 3207 err = class_register(&sd_disk_class);
3208 if (err)
3209 goto err_out;
6bdaa1f1 3210
4e7392ec
MP		 3211 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3212 0, 0, NULL);
3213 if (!sd_cdb_cache) {
3214 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3215 goto err_out_class;
3216 }
3217
3218 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3219 if (!sd_cdb_pool) {
3220 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3221 goto err_out_cache;
3222 }
3223
afd5e34b
JD		 3224 err = scsi_register_driver(&sd_template.gendrv);
3225 if (err)
3226 goto err_out_driver;
3227
5e4009ba
JG		 3228 return 0;
3229
afd5e34b
JD		 3230err_out_driver:
3231 mempool_destroy(sd_cdb_pool);
3232
4e7392ec
MP		 3233err_out_cache:
3234 kmem_cache_destroy(sd_cdb_cache);
3235
5e4009ba
JG		 3236err_out_class:
3237 class_unregister(&sd_disk_class);
3238err_out:
3239 for (i = 0; i < SD_MAJORS; i++)
3240 unregister_blkdev(sd_major(i), "sd");
3241 return err;
1da177e4
LT		 3242}
3243
3244/**
3245 * exit_sd - exit point for this driver (when it is a module).
3246 *
3247 * Note: this function unregisters this driver from the scsi mid-level.
3248 **/
3249static void __exit exit_sd(void)
3250{
3251 int i;
3252
3253 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3254
afd5e34b 3255 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3256 mempool_destroy(sd_cdb_pool);
3257 kmem_cache_destroy(sd_cdb_cache);
3258
5e4009ba
JG		 3259 class_unregister(&sd_disk_class);
3260
0761df9c
HR		 3261 for (i = 0; i < SD_MAJORS; i++) {
3262 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3263 unregister_blkdev(sd_major(i), "sd");
0761df9c 3264 }
1da177e4
LT		 3265}
3266
1da177e4
LT		 3267module_init(init_sd);
3268module_exit(exit_sd);
e73aec82
MP		 3269
3270static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3271 struct scsi_sense_hdr *sshdr)
3272{
2e4c3329 3273 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3274 scsi_show_sense_hdr(sshdr);
2e4c3329 3275 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3276 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3277}
3278
3279static void sd_print_result(struct scsi_disk *sdkp, int result)
3280{
2e4c3329 3281 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3282 scsi_show_result(result);
3283}
3284
Linux 6.x block layer and io_uring tree(s)