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sd: don't use scsi_setup_blk_pc_cmnd for discard requests
[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 **/
6a7b4398 694static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
e339c1a7 695{
6a7b4398
CH		 696 struct request *rq = cmd->request;
697 struct scsi_device *sdp = cmd->device;
e339c1a7 698 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 699 sector_t sector = blk_rq_pos(rq);
700 unsigned int nr_sectors = blk_rq_sectors(rq);
701 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 702 unsigned int len;
f1126e95 703 int ret;
c98a0eb0 704 char *buf;
66ac0280 705 struct page *page;
e339c1a7 706
26e85fcd
MP		 707 sector >>= ilog2(sdp->sector_size) - 9;
708 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7 709
66ac0280
CH		 710 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
711 if (!page)
712 return BLKPREP_DEFER;
713
c98a0eb0
MP		 714 switch (sdkp->provisioning_mode) {
715 case SD_LBP_UNMAP:
716 buf = page_address(page);
e339c1a7 717
6a7b4398
CH		 718 cmd->cmd_len = 10;
719 cmd->cmnd[0] = UNMAP;
720 cmd->cmnd[8] = 24;
e339c1a7
MP		 721
722 put_unaligned_be16(6 + 16, &buf[0]);
723 put_unaligned_be16(16, &buf[2]);
724 put_unaligned_be64(sector, &buf[8]);
66ac0280 725 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 726
66ac0280 727 len = 24;
c98a0eb0
MP		 728 break;
729
730 case SD_LBP_WS16:
6a7b4398
CH		 731 cmd->cmd_len = 16;
732 cmd->cmnd[0] = WRITE_SAME_16;
733 cmd->cmnd[1] = 0x8; /* UNMAP */
734 put_unaligned_be64(sector, &cmd->cmnd[2]);
735 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
66ac0280
CH		 736
737 len = sdkp->device->sector_size;
c98a0eb0
MP		 738 break;
739
740 case SD_LBP_WS10:
741 case SD_LBP_ZERO:
6a7b4398
CH		 742 cmd->cmd_len = 10;
743 cmd->cmnd[0] = WRITE_SAME;
c98a0eb0 744 if (sdkp->provisioning_mode == SD_LBP_WS10)
6a7b4398
CH		 745 cmd->cmnd[1] = 0x8; /* UNMAP */
746 put_unaligned_be32(sector, &cmd->cmnd[2]);
747 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
c98a0eb0
MP		 748
749 len = sdkp->device->sector_size;
750 break;
751
752 default:
09b9cc44 753 ret = BLKPREP_KILL;
c98a0eb0 754 goto out;
e339c1a7
MP		 755 }
756
dc4a9307 757 rq->completion_data = page;
6a7b4398
CH		 758 rq->timeout = SD_TIMEOUT;
759
760 cmd->transfersize = len;
761 cmd->allowed = rq->retries;
762
763 /*
764 * Initially __data_len is set to the amount of data that needs to be
765 * transferred to the target. This amount depends on whether WRITE SAME
766 * or UNMAP is being used. After the scatterlist has been mapped by
767 * scsi_init_io() we set __data_len to the size of the area to be
768 * discarded on disk. This allows us to report completion on the full
769 * amount of blocks described by the request.
770 */
66ac0280 771 blk_add_request_payload(rq, page, len);
6a7b4398 772 ret = scsi_init_io(cmd, GFP_ATOMIC);
26e85fcd 773 rq->__data_len = nr_bytes;
c98a0eb0
MP		 774
775out:
b4f42e28 776 if (ret != BLKPREP_OK)
610a6349 777 __free_page(page);
f1126e95
FT		 778 return ret;
779}
780
5db44863
MP		 781static void sd_config_write_same(struct scsi_disk *sdkp)
782{
783 struct request_queue *q = sdkp->disk->queue;
784 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 785
786 if (sdkp->device->no_write_same) {
787 sdkp->max_ws_blocks = 0;
788 goto out;
789 }
790
791 /* Some devices can not handle block counts above 0xffff despite
792 * supporting WRITE SAME(16). Consequently we default to 64k
793 * blocks per I/O unless the device explicitly advertises a
794 * bigger limit.
795 */
66c28f97
MP		 796 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
797 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
798 (u32)SD_MAX_WS16_BLOCKS);
799 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
800 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
801 (u32)SD_MAX_WS10_BLOCKS);
802 else {
803 sdkp->device->no_write_same = 1;
804 sdkp->max_ws_blocks = 0;
805 }
5db44863
MP		 806
807out:
66c28f97
MP		 808 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
809 (logical_block_size >> 9));
5db44863
MP		 810}
811
812/**
813 * sd_setup_write_same_cmnd - write the same data to multiple blocks
59b1134c 814 * @cmd: command to prepare
5db44863
MP		 815 *
816 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
817 * preference indicated by target device.
818 **/
59b1134c 819static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
5db44863 820{
59b1134c
CH		 821 struct request *rq = cmd->request;
822 struct scsi_device *sdp = cmd->device;
5db44863
MP		 823 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
824 struct bio *bio = rq->bio;
825 sector_t sector = blk_rq_pos(rq);
826 unsigned int nr_sectors = blk_rq_sectors(rq);
827 unsigned int nr_bytes = blk_rq_bytes(rq);
828 int ret;
829
830 if (sdkp->device->no_write_same)
831 return BLKPREP_KILL;
832
a4ad39b1 833 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863
MP		 834
835 sector >>= ilog2(sdp->sector_size) - 9;
836 nr_sectors >>= ilog2(sdp->sector_size) - 9;
837
5db44863 838 rq->timeout = SD_WRITE_SAME_TIMEOUT;
5db44863
MP		 839
840 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
59b1134c
CH		 841 cmd->cmd_len = 16;
842 cmd->cmnd[0] = WRITE_SAME_16;
843 put_unaligned_be64(sector, &cmd->cmnd[2]);
844 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
5db44863 845 } else {
59b1134c
CH		 846 cmd->cmd_len = 10;
847 cmd->cmnd[0] = WRITE_SAME;
848 put_unaligned_be32(sector, &cmd->cmnd[2]);
849 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
5db44863
MP		 850 }
851
59b1134c
CH		 852 cmd->transfersize = sdp->sector_size;
853 cmd->allowed = rq->retries;
5db44863 854
59b1134c
CH		 855 /*
856 * For WRITE_SAME the data transferred in the DATA IN buffer is
857 * different from the amount of data actually written to the target.
858 *
859 * We set up __data_len to the amount of data transferred from the
860 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
861 * to transfer a single sector of data first, but then reset it to
862 * the amount of data to be written right after so that the I/O path
863 * knows how much to actually write.
864 */
865 rq->__data_len = sdp->sector_size;
866 ret = scsi_init_io(cmd, GFP_ATOMIC);
867 rq->__data_len = nr_bytes;
5db44863
MP		 868 return ret;
869}
870
a118c6c1 871static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
90467c29 872{
a118c6c1
CH		 873 struct request *rq = cmd->request;
874
875 /* flush requests don't perform I/O, zero the S/G table */
876 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
90467c29 877
a118c6c1
CH		 878 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
879 cmd->cmd_len = 10;
880 cmd->transfersize = 0;
881 cmd->allowed = SD_MAX_RETRIES;
882
883 rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
884 return BLKPREP_OK;
90467c29
FT		 885}
886
a1b73fc1 887static void sd_uninit_command(struct scsi_cmnd *SCpnt)
f1126e95 888{
a1b73fc1 889 struct request *rq = SCpnt->request;
085b513f 890
dc4a9307
JA		 891 if (rq->cmd_flags & REQ_DISCARD)
892 __free_page(rq->completion_data);
b4f42e28 893
085b513f
EM		 894 if (SCpnt->cmnd != rq->cmd) {
895 mempool_free(SCpnt->cmnd, sd_cdb_pool);
896 SCpnt->cmnd = NULL;
897 SCpnt->cmd_len = 0;
898 }
e339c1a7
MP		 899}
900
a1b73fc1 901static int sd_init_command(struct scsi_cmnd *SCpnt)
1da177e4 902{
a1b73fc1
CH		 903 struct request *rq = SCpnt->request;
904 struct scsi_device *sdp = SCpnt->device;
776b23a0 905 struct gendisk *disk = rq->rq_disk;
af55ff67 906 struct scsi_disk *sdkp;
83096ebf 907 sector_t block = blk_rq_pos(rq);
18351070 908 sector_t threshold;
83096ebf 909 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 910 int ret, host_dif;
4e7392ec 911 unsigned char protect;
7f9a6bc4 912
e339c1a7
MP		 913 /*
914 * Discard request come in as REQ_TYPE_FS but we turn them into
915 * block PC requests to make life easier.
916 */
66ac0280 917 if (rq->cmd_flags & REQ_DISCARD) {
6a7b4398 918 ret = sd_setup_discard_cmnd(SCpnt);
66ac0280 919 goto out;
5db44863 920 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
59b1134c 921 ret = sd_setup_write_same_cmnd(SCpnt);
5db44863 922 goto out;
90467c29 923 } else if (rq->cmd_flags & REQ_FLUSH) {
a118c6c1 924 ret = sd_setup_flush_cmnd(SCpnt);
90467c29 925 goto out;
7f9a6bc4 926 }
3868cf8e 927 ret = scsi_init_io(SCpnt, GFP_ATOMIC);
7f9a6bc4
JB		 928 if (ret != BLKPREP_OK)
929 goto out;
930 SCpnt = rq->special;
af55ff67 931 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 932
933 /* from here on until we're complete, any goto out
934 * is used for a killable error condition */
935 ret = BLKPREP_KILL;
1da177e4 936
a1b73fc1
CH		 937 SCSI_LOG_HLQUEUE(1,
938 scmd_printk(KERN_INFO, SCpnt,
939 "%s: block=%llu, count=%d\n",
940 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 941
942 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 943 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 944 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 945 "Finishing %u sectors\n",
946 blk_rq_sectors(rq)));
fa0d34be
MP		 947 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
948 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 949 goto out;
1da177e4
LT		 950 }
951
952 if (sdp->changed) {
953 /*
954 * quietly refuse to do anything to a changed disc until
955 * the changed bit has been reset
956 */
3ff5588d 957 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 958 goto out;
1da177e4 959 }
7f9a6bc4 960
a0899d4d 961 /*
18351070
LT		 962 * Some SD card readers can't handle multi-sector accesses which touch
963 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 964 */
18351070
LT		 965 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
966 (sdp->sector_size / 512);
967
968 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
969 if (block < threshold) {
970 /* Access up to the threshold but not beyond */
971 this_count = threshold - block;
972 } else {
973 /* Access only a single hardware sector */
974 this_count = sdp->sector_size / 512;
975 }
976 }
a0899d4d 977
fa0d34be
MP		 978 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
979 (unsigned long long)block));
1da177e4
LT		 980
981 /*
982 * If we have a 1K hardware sectorsize, prevent access to single
983 * 512 byte sectors. In theory we could handle this - in fact
984 * the scsi cdrom driver must be able to handle this because
985 * we typically use 1K blocksizes, and cdroms typically have
986 * 2K hardware sectorsizes. Of course, things are simpler
987 * with the cdrom, since it is read-only. For performance
988 * reasons, the filesystems should be able to handle this
989 * and not force the scsi disk driver to use bounce buffers
990 * for this.
991 */
992 if (sdp->sector_size == 1024) {
83096ebf 993 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 994 scmd_printk(KERN_ERR, SCpnt,
995 "Bad block number requested\n");
7f9a6bc4 996 goto out;
1da177e4
LT		 997 } else {
998 block = block >> 1;
999 this_count = this_count >> 1;
1000 }
1001 }
1002 if (sdp->sector_size == 2048) {
83096ebf 1003 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 1004 scmd_printk(KERN_ERR, SCpnt,
1005 "Bad block number requested\n");
7f9a6bc4 1006 goto out;
1da177e4
LT		 1007 } else {
1008 block = block >> 2;
1009 this_count = this_count >> 2;
1010 }
1011 }
1012 if (sdp->sector_size == 4096) {
83096ebf 1013 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 1014 scmd_printk(KERN_ERR, SCpnt,
1015 "Bad block number requested\n");
7f9a6bc4 1016 goto out;
1da177e4
LT		 1017 } else {
1018 block = block >> 3;
1019 this_count = this_count >> 3;
1020 }
1021 }
1022 if (rq_data_dir(rq) == WRITE) {
1023 if (!sdp->writeable) {
7f9a6bc4 1024 goto out;
1da177e4
LT		 1025 }
1026 SCpnt->cmnd[0] = WRITE_6;
af55ff67 1027
8c579ab6
MP		 1028 if (blk_integrity_rq(rq))
1029 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 1030
1da177e4
LT		 1031 } else if (rq_data_dir(rq) == READ) {
1032 SCpnt->cmnd[0] = READ_6;
1da177e4 1033 } else {
5953316d 1034 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
7f9a6bc4 1035 goto out;
1da177e4
LT		 1036 }
1037
fa0d34be 1038 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1039 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1040 (rq_data_dir(rq) == WRITE) ?
1041 "writing" : "reading", this_count,
83096ebf 1042 blk_rq_sectors(rq)));
1da177e4 1043
af55ff67 1044 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 1045 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1046 if (host_dif)
4e7392ec 1047 protect = 1 << 5;
af55ff67 1048 else
4e7392ec
MP		 1049 protect = 0;
1050
1051 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1052 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1053
1054 if (unlikely(SCpnt->cmnd == NULL)) {
1055 ret = BLKPREP_DEFER;
1056 goto out;
1057 }
af55ff67 1058
4e7392ec
MP		 1059 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1060 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1061 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1062 SCpnt->cmnd[7] = 0x18;
1063 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1064 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1065
1066 /* LBA */
1067 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1068 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1069 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1070 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1071 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1072 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1073 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1074 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1075
1076 /* Expected Indirect LBA */
1077 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1078 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1079 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1080 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1081
1082 /* Transfer length */
1083 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1084 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1085 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1086 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1087 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1088 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1089 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1090 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1091 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1092 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1093 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1094 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1095 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1096 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1097 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1098 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1099 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1100 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1101 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1102 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1103 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1104 scsi_device_protection(SCpnt->device) ||
1da177e4 1105 SCpnt->device->use_10_for_rw) {
1da177e4 1106 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1107 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1108 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1109 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1110 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1111 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1112 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1113 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1114 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1115 } else {
33659ebb 1116 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1117 /*
1118 * This happens only if this drive failed
1119 * 10byte rw command with ILLEGAL_REQUEST
1120 * during operation and thus turned off
1121 * use_10_for_rw.
1122 */
e73aec82
MP		 1123 scmd_printk(KERN_ERR, SCpnt,
1124 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1125 goto out;
007365ad
TH		 1126 }
1127
1da177e4
LT		 1128 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1129 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1130 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1131 SCpnt->cmnd[4] = (unsigned char) this_count;
1132 SCpnt->cmnd[5] = 0;
1133 }
30b0c37b 1134 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1135
af55ff67 1136 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1137 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1138 sd_prot_op(SCpnt, host_dif);
af55ff67 1139
1da177e4
LT		 1140 /*
1141 * We shouldn't disconnect in the middle of a sector, so with a dumb
1142 * host adapter, it's safe to assume that we can at least transfer
1143 * this many bytes between each connect / disconnect.
1144 */
1145 SCpnt->transfersize = sdp->sector_size;
1146 SCpnt->underflow = this_count << 9;
1147 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1148
1da177e4
LT		 1149 /*
1150 * This indicates that the command is ready from our end to be
1151 * queued.
1152 */
7f9a6bc4
JB		 1153 ret = BLKPREP_OK;
1154 out:
a1b73fc1 1155 return ret;
1da177e4
LT		 1156}
1157
1158/**
1159 * sd_open - open a scsi disk device
1160 * @inode: only i_rdev member may be used
1161 * @filp: only f_mode and f_flags may be used
1162 *
1163 * Returns 0 if successful. Returns a negated errno value in case
1164 * of error.
1165 *
1166 * Note: This can be called from a user context (e.g. fsck(1) )
1167 * or from within the kernel (e.g. as a result of a mount(1) ).
1168 * In the latter case @inode and @filp carry an abridged amount
1169 * of information as noted above.
409f3499
AB		 1170 *
1171 * Locking: called with bdev->bd_mutex held.
1da177e4 1172 **/
0338e291 1173static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1174{
0338e291 1175 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1176 struct scsi_device *sdev;
1177 int retval;
1178
0338e291 1179 if (!sdkp)
1da177e4
LT		 1180 return -ENXIO;
1181
fa0d34be 1182 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1183
1184 sdev = sdkp->device;
1185
1186 /*
1187 * If the device is in error recovery, wait until it is done.
1188 * If the device is offline, then disallow any access to it.
1189 */
1190 retval = -ENXIO;
1191 if (!scsi_block_when_processing_errors(sdev))
1192 goto error_out;
1193
1194 if (sdev->removable || sdkp->write_prot)
0338e291 1195 check_disk_change(bdev);
1da177e4
LT		 1196
1197 /*
1198 * If the drive is empty, just let the open fail.
1199 */
1200 retval = -ENOMEDIUM;
0338e291 1201 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1202 goto error_out;
1203
1204 /*
1205 * If the device has the write protect tab set, have the open fail
1206 * if the user expects to be able to write to the thing.
1207 */
1208 retval = -EROFS;
0338e291 1209 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1210 goto error_out;
1211
1212 /*
1213 * It is possible that the disk changing stuff resulted in
1214 * the device being taken offline. If this is the case,
1215 * report this to the user, and don't pretend that the
1216 * open actually succeeded.
1217 */
1218 retval = -ENXIO;
1219 if (!scsi_device_online(sdev))
1220 goto error_out;
1221
409f3499 1222 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1223 if (scsi_block_when_processing_errors(sdev))
1224 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1225 }
1226
1227 return 0;
1228
1229error_out:
1230 scsi_disk_put(sdkp);
1231 return retval;
1232}
1233
1234/**
1235 * sd_release - invoked when the (last) close(2) is called on this
1236 * scsi disk.
1237 * @inode: only i_rdev member may be used
1238 * @filp: only f_mode and f_flags may be used
1239 *
1240 * Returns 0.
1241 *
1242 * Note: may block (uninterruptible) if error recovery is underway
1243 * on this disk.
409f3499
AB		 1244 *
1245 * Locking: called with bdev->bd_mutex held.
1da177e4 1246 **/
db2a144b 1247static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1248{
1da177e4
LT		 1249 struct scsi_disk *sdkp = scsi_disk(disk);
1250 struct scsi_device *sdev = sdkp->device;
1251
56937f7b 1252 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1253
7e443312 1254 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1255 if (scsi_block_when_processing_errors(sdev))
1256 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1257 }
1258
1259 /*
1260 * XXX and what if there are packets in flight and this close()
1261 * XXX is followed by a "rmmod sd_mod"?
1262 */
478a8a05 1263
1da177e4 1264 scsi_disk_put(sdkp);
1da177e4
LT		 1265}
1266
a885c8c4 1267static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1268{
1269 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1270 struct scsi_device *sdp = sdkp->device;
1271 struct Scsi_Host *host = sdp->host;
1272 int diskinfo[4];
1273
1274 /* default to most commonly used values */
1275 diskinfo[0] = 0x40; /* 1 << 6 */
1276 diskinfo[1] = 0x20; /* 1 << 5 */
1277 diskinfo[2] = sdkp->capacity >> 11;
1278
1279 /* override with calculated, extended default, or driver values */
1280 if (host->hostt->bios_param)
1281 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1282 else
1283 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1284
a885c8c4
CH		 1285 geo->heads = diskinfo[0];
1286 geo->sectors = diskinfo[1];
1287 geo->cylinders = diskinfo[2];
1da177e4
LT		 1288 return 0;
1289}
1290
1291/**
1292 * sd_ioctl - process an ioctl
1293 * @inode: only i_rdev/i_bdev members may be used
1294 * @filp: only f_mode and f_flags may be used
1295 * @cmd: ioctl command number
1296 * @arg: this is third argument given to ioctl(2) system call.
1297 * Often contains a pointer.
1298 *
25985edc 1299 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1300 * success as well). Returns a negated errno value in case of error.
1301 *
1302 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1303 * down in the scsi subsystem.
1da177e4 1304 **/
0338e291 1305static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1306 unsigned int cmd, unsigned long arg)
1307{
1da177e4 1308 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1309 struct scsi_disk *sdkp = scsi_disk(disk);
1310 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1311 void __user *p = (void __user *)arg;
1312 int error;
1313
fe2d1851
NN		 1314 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1315 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1316
0bfc96cb
PB		 1317 error = scsi_verify_blk_ioctl(bdev, cmd);
1318 if (error < 0)
1319 return error;
1320
1da177e4
LT		 1321 /*
1322 * If we are in the middle of error recovery, don't let anyone
1323 * else try and use this device. Also, if error recovery fails, it
1324 * may try and take the device offline, in which case all further
1325 * access to the device is prohibited.
1326 */
83ff6fe8 1327 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1328 (mode & FMODE_NDELAY) != 0);
1da177e4 1329 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1330 goto out;
1da177e4 1331
1da177e4
LT		 1332 /*
1333 * Send SCSI addressing ioctls directly to mid level, send other
1334 * ioctls to block level and then onto mid level if they can't be
1335 * resolved.
1336 */
1337 switch (cmd) {
1338 case SCSI_IOCTL_GET_IDLUN:
1339 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1340 error = scsi_ioctl(sdp, cmd, p);
1341 break;
1da177e4 1342 default:
577ebb37 1343 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1344 if (error != -ENOTTY)
8a6cfeb6
AB		 1345 break;
1346 error = scsi_ioctl(sdp, cmd, p);
1347 break;
1da177e4 1348 }
8a6cfeb6 1349out:
8a6cfeb6 1350 return error;
1da177e4
LT		 1351}
1352
1353static void set_media_not_present(struct scsi_disk *sdkp)
1354{
2bae0093
TH		 1355 if (sdkp->media_present)
1356 sdkp->device->changed = 1;
1357
1358 if (sdkp->device->removable) {
1359 sdkp->media_present = 0;
1360 sdkp->capacity = 0;
1361 }
1362}
1363
1364static int media_not_present(struct scsi_disk *sdkp,
1365 struct scsi_sense_hdr *sshdr)
1366{
1367 if (!scsi_sense_valid(sshdr))
1368 return 0;
1369
1370 /* not invoked for commands that could return deferred errors */
1371 switch (sshdr->sense_key) {
1372 case UNIT_ATTENTION:
1373 case NOT_READY:
1374 /* medium not present */
1375 if (sshdr->asc == 0x3A) {
1376 set_media_not_present(sdkp);
1377 return 1;
1378 }
1379 }
1380 return 0;
1da177e4
LT		 1381}
1382
1383/**
2bae0093
TH		 1384 * sd_check_events - check media events
1385 * @disk: kernel device descriptor
1386 * @clearing: disk events currently being cleared
1da177e4 1387 *
2bae0093 1388 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1389 *
1390 * Note: this function is invoked from the block subsystem.
1391 **/
2bae0093 1392static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1393{
1394 struct scsi_disk *sdkp = scsi_disk(disk);
1395 struct scsi_device *sdp = sdkp->device;
001aac25 1396 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1397 int retval;
1398
2bae0093 1399 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1400
1401 /*
1402 * If the device is offline, don't send any commands - just pretend as
1403 * if the command failed. If the device ever comes back online, we
1404 * can deal with it then. It is only because of unrecoverable errors
1405 * that we would ever take a device offline in the first place.
1406 */
285e9670
KS		 1407 if (!scsi_device_online(sdp)) {
1408 set_media_not_present(sdkp);
285e9670
KS		 1409 goto out;
1410 }
1da177e4
LT		 1411
1412 /*
1413 * Using TEST_UNIT_READY enables differentiation between drive with
1414 * no cartridge loaded - NOT READY, drive with changed cartridge -
1415 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1416 *
1417 * Drives that auto spin down. eg iomega jaz 1G, will be started
1418 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1419 * sd_revalidate() is called.
1420 */
1421 retval = -ENODEV;
285e9670 1422
001aac25
JB		 1423 if (scsi_block_when_processing_errors(sdp)) {
1424 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1425 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1426 sshdr);
1427 }
1da177e4 1428
2bae0093
TH		 1429 /* failed to execute TUR, assume media not present */
1430 if (host_byte(retval)) {
285e9670 1431 set_media_not_present(sdkp);
285e9670
KS		 1432 goto out;
1433 }
1da177e4 1434
2bae0093
TH		 1435 if (media_not_present(sdkp, sshdr))
1436 goto out;
1437
1da177e4
LT		 1438 /*
1439 * For removable scsi disk we have to recognise the presence
2bae0093 1440 * of a disk in the drive.
1da177e4 1441 */
2bae0093
TH		 1442 if (!sdkp->media_present)
1443 sdp->changed = 1;
1da177e4 1444 sdkp->media_present = 1;
285e9670 1445out:
3ff5588d 1446 /*
2bae0093 1447 * sdp->changed is set under the following conditions:
3ff5588d 1448 *
2bae0093
TH		 1449 * Medium present state has changed in either direction.
1450 * Device has indicated UNIT_ATTENTION.
3ff5588d 1451 */
001aac25 1452 kfree(sshdr);
2bae0093
TH		 1453 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1454 sdp->changed = 0;
1da177e4 1455 return retval;
1da177e4
LT		 1456}
1457
e73aec82 1458static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1459{
1da177e4 1460 int retries, res;
e73aec82 1461 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1462 const int timeout = sdp->request_queue->rq_timeout
1463 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1464 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1465
1466 if (!scsi_device_online(sdp))
1467 return -ENODEV;
1468
1da177e4
LT		 1469 for (retries = 3; retries > 0; --retries) {
1470 unsigned char cmd[10] = { 0 };
1471
1472 cmd[0] = SYNCHRONIZE_CACHE;
1473 /*
1474 * Leave the rest of the command zero to indicate
1475 * flush everything.
1476 */
9b21493c 1477 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
7e660100
JB		 1478 &sshdr, timeout, SD_MAX_RETRIES,
1479 NULL, REQ_PM);
ea73a9f2 1480 if (res == 0)
1da177e4
LT		 1481 break;
1482 }
1483
e73aec82
MP		 1484 if (res) {
1485 sd_print_result(sdkp, res);
95897910 1486
e73aec82
MP		 1487 if (driver_byte(res) & DRIVER_SENSE)
1488 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1489 /* we need to evaluate the error return */
1490 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1491 (sshdr.asc == 0x3a || /* medium not present */
1492 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1493 /* this is no error here */
1494 return 0;
1495
1496 switch (host_byte(res)) {
1497 /* ignore errors due to racing a disconnection */
1498 case DID_BAD_TARGET:
1499 case DID_NO_CONNECT:
1500 return 0;
1501 /* signal the upper layer it might try again */
1502 case DID_BUS_BUSY:
1503 case DID_IMM_RETRY:
1504 case DID_REQUEUE:
1505 case DID_SOFT_ERROR:
1506 return -EBUSY;
1507 default:
1508 return -EIO;
1509 }
1da177e4 1510 }
3721050a 1511 return 0;
1da177e4
LT		 1512}
1513
1da177e4
LT		 1514static void sd_rescan(struct device *dev)
1515{
39b7f1e2
AS		 1516 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1517
1518 if (sdkp) {
f98a8cae 1519 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1520 scsi_disk_put(sdkp);
1521 }
1da177e4
LT		 1522}
1523
1524
1525#ifdef CONFIG_COMPAT
1526/*
1527 * This gets directly called from VFS. When the ioctl
1528 * is not recognized we go back to the other translation paths.
1529 */
0338e291
AV		 1530static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1531 unsigned int cmd, unsigned long arg)
1da177e4 1532{
0338e291 1533 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1534 int ret;
1535
1536 ret = scsi_verify_blk_ioctl(bdev, cmd);
1537 if (ret < 0)
1538 return ret;
1da177e4
LT		 1539
1540 /*
1541 * If we are in the middle of error recovery, don't let anyone
1542 * else try and use this device. Also, if error recovery fails, it
1543 * may try and take the device offline, in which case all further
1544 * access to the device is prohibited.
1545 */
1546 if (!scsi_block_when_processing_errors(sdev))
1547 return -ENODEV;
1548
1549 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1550 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1551
1552 return ret;
1553 }
1554
1555 /*
1556 * Let the static ioctl translation table take care of it.
1557 */
1558 return -ENOIOCTLCMD;
1559}
1560#endif
1561
83d5cde4 1562static const struct block_device_operations sd_fops = {
1da177e4 1563 .owner = THIS_MODULE,
0338e291
AV		 1564 .open = sd_open,
1565 .release = sd_release,
8a6cfeb6 1566 .ioctl = sd_ioctl,
a885c8c4 1567 .getgeo = sd_getgeo,
1da177e4 1568#ifdef CONFIG_COMPAT
0338e291 1569 .compat_ioctl = sd_compat_ioctl,
1da177e4 1570#endif
2bae0093 1571 .check_events = sd_check_events,
1da177e4 1572 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1573 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1574};
1575
18a4d0a2
MP		 1576/**
1577 * sd_eh_action - error handling callback
1578 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1579 * @eh_disp: The recovery disposition suggested by the midlayer
1580 *
2451079b
JB		 1581 * This function is called by the SCSI midlayer upon completion of an
1582 * error test command (currently TEST UNIT READY). The result of sending
1583 * the eh command is passed in eh_disp. We're looking for devices that
1584 * fail medium access commands but are OK with non access commands like
1585 * test unit ready (so wrongly see the device as having a successful
1586 * recovery)
18a4d0a2 1587 **/
2451079b 1588static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1589{
1590 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1591
1592 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1593 !scsi_medium_access_command(scmd) ||
1594 host_byte(scmd->result) != DID_TIME_OUT ||
1595 eh_disp != SUCCESS)
18a4d0a2
MP		 1596 return eh_disp;
1597
1598 /*
1599 * The device has timed out executing a medium access command.
1600 * However, the TEST UNIT READY command sent during error
1601 * handling completed successfully. Either the device is in the
1602 * process of recovering or has it suffered an internal failure
1603 * that prevents access to the storage medium.
1604 */
2451079b 1605 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1606
1607 /*
1608 * If the device keeps failing read/write commands but TEST UNIT
1609 * READY always completes successfully we assume that medium
1610 * access is no longer possible and take the device offline.
1611 */
1612 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1613 scmd_printk(KERN_ERR, scmd,
1614 "Medium access timeout failure. Offlining disk!\n");
1615 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1616
1617 return FAILED;
1618 }
1619
1620 return eh_disp;
1621}
1622
af55ff67
MP		 1623static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1624{
83096ebf
TH		 1625 u64 start_lba = blk_rq_pos(scmd->request);
1626 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1627 u64 bad_lba;
1628 int info_valid;
a8733c7b
JB		 1629 /*
1630 * resid is optional but mostly filled in. When it's unused,
1631 * its value is zero, so we assume the whole buffer transferred
1632 */
1633 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1634 unsigned int good_bytes;
af55ff67 1635
33659ebb 1636 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1637 return 0;
1638
1639 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1640 SCSI_SENSE_BUFFERSIZE,
1641 &bad_lba);
1642 if (!info_valid)
1643 return 0;
1644
1645 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1646 return 0;
1647
1648 if (scmd->device->sector_size < 512) {
1649 /* only legitimate sector_size here is 256 */
1650 start_lba <<= 1;
1651 end_lba <<= 1;
1652 } else {
1653 /* be careful ... don't want any overflows */
ef80d1e1 1654 unsigned int factor = scmd->device->sector_size / 512;
af55ff67
MP		 1655 do_div(start_lba, factor);
1656 do_div(end_lba, factor);
1657 }
1658
1659 /* The bad lba was reported incorrectly, we have no idea where
1660 * the error is.
1661 */
1662 if (bad_lba < start_lba || bad_lba >= end_lba)
1663 return 0;
1664
1665 /* This computation should always be done in terms of
1666 * the resolution of the device's medium.
1667 */
a8733c7b
JB		 1668 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1669 return min(good_bytes, transferred);
af55ff67
MP		 1670}
1671
1da177e4 1672/**
7b3d9545 1673 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1674 * driver has completed (successfully or otherwise) a scsi command.
1675 * @SCpnt: mid-level's per command structure.
1676 *
1677 * Note: potentially run from within an ISR. Must not block.
1678 **/
7b3d9545 1679static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1680{
1681 int result = SCpnt->result;
af55ff67 1682 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1683 struct scsi_sense_hdr sshdr;
4e7392ec 1684 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1685 struct request *req = SCpnt->request;
1da177e4
LT		 1686 int sense_valid = 0;
1687 int sense_deferred = 0;
c98a0eb0 1688 unsigned char op = SCpnt->cmnd[0];
5db44863 1689 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1690
5db44863 1691 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1692 if (!result) {
1693 good_bytes = blk_rq_bytes(req);
1694 scsi_set_resid(SCpnt, 0);
1695 } else {
1696 good_bytes = 0;
1697 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1698 }
1699 }
6a32a8ae 1700
1da177e4
LT		 1701 if (result) {
1702 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1703 if (sense_valid)
1704 sense_deferred = scsi_sense_is_deferred(&sshdr);
1705 }
1da177e4 1706#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1707 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1708 if (sense_valid) {
fa0d34be 1709 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1710 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1711 "ascq]=%x,%x,%x,%x\n",
1712 sshdr.response_code,
1713 sshdr.sense_key, sshdr.asc,
1714 sshdr.ascq));
1da177e4
LT		 1715 }
1716#endif
2a863ba8
DJ		 1717 sdkp->medium_access_timed_out = 0;
1718
03aba2f7
LT		 1719 if (driver_byte(result) != DRIVER_SENSE &&
1720 (!sense_valid || sense_deferred))
1721 goto out;
1722
1723 switch (sshdr.sense_key) {
1724 case HARDWARE_ERROR:
1725 case MEDIUM_ERROR:
af55ff67 1726 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1727 break;
1728 case RECOVERED_ERROR:
af55ff67
MP		 1729 good_bytes = scsi_bufflen(SCpnt);
1730 break;
10dab226
JW		 1731 case NO_SENSE:
1732 /* This indicates a false check condition, so ignore it. An
1733 * unknown amount of data was transferred so treat it as an
1734 * error.
1735 */
1736 scsi_print_sense("sd", SCpnt);
1737 SCpnt->result = 0;
1738 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1739 break;
c98a0eb0
MP		 1740 case ABORTED_COMMAND:
1741 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1742 good_bytes = sd_completed_bytes(SCpnt);
1743 break;
1744 case ILLEGAL_REQUEST:
1745 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1746 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1747 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1748 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1749 switch (op) {
1750 case UNMAP:
1751 sd_config_discard(sdkp, SD_LBP_DISABLE);
1752 break;
1753 case WRITE_SAME_16:
1754 case WRITE_SAME:
1755 if (unmap)
1756 sd_config_discard(sdkp, SD_LBP_DISABLE);
1757 else {
1758 sdkp->device->no_write_same = 1;
1759 sd_config_write_same(sdkp);
1760
1761 good_bytes = 0;
1762 req->__data_len = blk_rq_bytes(req);
1763 req->cmd_flags |= REQ_QUIET;
1764 }
1765 }
1766 }
03aba2f7
LT		 1767 break;
1768 default:
1769 break;
1da177e4 1770 }
03aba2f7 1771 out:
af55ff67
MP		 1772 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1773 sd_dif_complete(SCpnt, good_bytes);
1774
7b3d9545 1775 return good_bytes;
1da177e4
LT		 1776}
1777
1da177e4
LT		 1778/*
1779 * spinup disk - called only in sd_revalidate_disk()
1780 */
1781static void
e73aec82 1782sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1783{
1da177e4 1784 unsigned char cmd[10];
4451e472 1785 unsigned long spintime_expire = 0;
1da177e4
LT		 1786 int retries, spintime;
1787 unsigned int the_result;
1788 struct scsi_sense_hdr sshdr;
1789 int sense_valid = 0;
1790
1791 spintime = 0;
1792
1793 /* Spin up drives, as required. Only do this at boot time */
1794 /* Spinup needs to be done for module loads too. */
1795 do {
1796 retries = 0;
1797
1798 do {
1799 cmd[0] = TEST_UNIT_READY;
1800 memset((void *) &cmd[1], 0, 9);
1801
ea73a9f2
JB		 1802 the_result = scsi_execute_req(sdkp->device, cmd,
1803 DMA_NONE, NULL, 0,
1804 &sshdr, SD_TIMEOUT,
f4f4e47e 1805 SD_MAX_RETRIES, NULL);
1da177e4 1806
b4d38e38
AS		 1807 /*
1808 * If the drive has indicated to us that it
1809 * doesn't have any media in it, don't bother
1810 * with any more polling.
1811 */
1812 if (media_not_present(sdkp, &sshdr))
1813 return;
1814
1da177e4 1815 if (the_result)
ea73a9f2 1816 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1817 retries++;
1818 } while (retries < 3 &&
1819 (!scsi_status_is_good(the_result) ||
1820 ((driver_byte(the_result) & DRIVER_SENSE) &&
1821 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1822
1da177e4
LT		 1823 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1824 /* no sense, TUR either succeeded or failed
1825 * with a status error */
e73aec82
MP		 1826 if(!spintime && !scsi_status_is_good(the_result)) {
1827 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1828 sd_print_result(sdkp, the_result);
1829 }
1da177e4
LT		 1830 break;
1831 }
1832
1833 /*
1834 * The device does not want the automatic start to be issued.
1835 */
33dd6f92 1836 if (sdkp->device->no_start_on_add)
1da177e4 1837 break;
1da177e4 1838
33dd6f92
MW		 1839 if (sense_valid && sshdr.sense_key == NOT_READY) {
1840 if (sshdr.asc == 4 && sshdr.ascq == 3)
1841 break; /* manual intervention required */
1842 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1843 break; /* standby */
1844 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1845 break; /* unavailable */
1846 /*
1847 * Issue command to spin up drive when not ready
1848 */
1da177e4 1849 if (!spintime) {
e73aec82 1850 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1851 cmd[0] = START_STOP;
1852 cmd[1] = 1; /* Return immediately */
1853 memset((void *) &cmd[2], 0, 8);
1854 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1855 if (sdkp->device->start_stop_pwr_cond)
1856 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1857 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1858 NULL, 0, &sshdr,
f4f4e47e
FT		 1859 SD_TIMEOUT, SD_MAX_RETRIES,
1860 NULL);
4451e472
AS		 1861 spintime_expire = jiffies + 100 * HZ;
1862 spintime = 1;
1da177e4 1863 }
1da177e4
LT		 1864 /* Wait 1 second for next try */
1865 msleep(1000);
1866 printk(".");
4451e472
AS		 1867
1868 /*
1869 * Wait for USB flash devices with slow firmware.
1870 * Yes, this sense key/ASC combination shouldn't
1871 * occur here. It's characteristic of these devices.
1872 */
1873 } else if (sense_valid &&
1874 sshdr.sense_key == UNIT_ATTENTION &&
1875 sshdr.asc == 0x28) {
1876 if (!spintime) {
1877 spintime_expire = jiffies + 5 * HZ;
1878 spintime = 1;
1879 }
1880 /* Wait 1 second for next try */
1881 msleep(1000);
1da177e4
LT		 1882 } else {
1883 /* we don't understand the sense code, so it's
1884 * probably pointless to loop */
1885 if(!spintime) {
e73aec82
MP		 1886 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1887 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1888 }
1889 break;
1890 }
1891
4451e472 1892 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1893
1894 if (spintime) {
1895 if (scsi_status_is_good(the_result))
1896 printk("ready\n");
1897 else
1898 printk("not responding...\n");
1899 }
1900}
1901
e0597d70
MP		 1902
1903/*
1904 * Determine whether disk supports Data Integrity Field.
1905 */
fe542396 1906static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1907{
1908 struct scsi_device *sdp = sdkp->device;
1909 u8 type;
fe542396 1910 int ret = 0;
e0597d70
MP		 1911
1912 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1913 return ret;
35e1a5d9
MP		 1914
1915 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1916
fe542396
MP		 1917 if (type > SD_DIF_TYPE3_PROTECTION)
1918 ret = -ENODEV;
1919 else if (scsi_host_dif_capable(sdp->host, type))
1920 ret = 1;
1921
1922 if (sdkp->first_scan || type != sdkp->protection_type)
1923 switch (ret) {
1924 case -ENODEV:
1925 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1926 " protection type %u. Disabling disk!\n",
1927 type);
1928 break;
1929 case 1:
1930 sd_printk(KERN_NOTICE, sdkp,
1931 "Enabling DIF Type %u protection\n", type);
1932 break;
1933 case 0:
1934 sd_printk(KERN_NOTICE, sdkp,
1935 "Disabling DIF Type %u protection\n", type);
1936 break;
1937 }
e0597d70 1938
be922f47
MP		 1939 sdkp->protection_type = type;
1940
fe542396 1941 return ret;
e0597d70
MP		 1942}
1943
0da205e0
MW		 1944static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1945 struct scsi_sense_hdr *sshdr, int sense_valid,
1946 int the_result)
1947{
1948 sd_print_result(sdkp, the_result);
1949 if (driver_byte(the_result) & DRIVER_SENSE)
1950 sd_print_sense_hdr(sdkp, sshdr);
1951 else
1952 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1953
1954 /*
1955 * Set dirty bit for removable devices if not ready -
1956 * sometimes drives will not report this properly.
1957 */
1958 if (sdp->removable &&
1959 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1960 set_media_not_present(sdkp);
0da205e0
MW		 1961
1962 /*
1963 * We used to set media_present to 0 here to indicate no media
1964 * in the drive, but some drives fail read capacity even with
1965 * media present, so we can't do that.
1966 */
1967 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1968}
1969
1970#define RC16_LEN 32
1971#if RC16_LEN > SD_BUF_SIZE
1972#error RC16_LEN must not be more than SD_BUF_SIZE
1973#endif
1974
3233ac19
JB		 1975#define READ_CAPACITY_RETRIES_ON_RESET 10
1976
0da205e0
MW		 1977static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1978 unsigned char *buffer)
ea73a9f2 1979{
1da177e4 1980 unsigned char cmd[16];
1da177e4
LT		 1981 struct scsi_sense_hdr sshdr;
1982 int sense_valid = 0;
0da205e0 1983 int the_result;
3233ac19 1984 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1985 unsigned int alignment;
0da205e0
MW		 1986 unsigned long long lba;
1987 unsigned sector_size;
1da177e4 1988
5ce524bd
HG		 1989 if (sdp->no_read_capacity_16)
1990 return -EINVAL;
1991
1da177e4 1992 do {
0da205e0
MW		 1993 memset(cmd, 0, 16);
1994 cmd[0] = SERVICE_ACTION_IN;
1995 cmd[1] = SAI_READ_CAPACITY_16;
1996 cmd[13] = RC16_LEN;
1997 memset(buffer, 0, RC16_LEN);
1998
ea73a9f2 1999 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 2000 buffer, RC16_LEN, &sshdr,
2001 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 2002
ea73a9f2 2003 if (media_not_present(sdkp, &sshdr))
0da205e0 2004 return -ENODEV;
1da177e4 2005
2b301307 2006 if (the_result) {
ea73a9f2 2007 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 2008 if (sense_valid &&
2009 sshdr.sense_key == ILLEGAL_REQUEST &&
2010 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2011 sshdr.ascq == 0x00)
2012 /* Invalid Command Operation Code or
2013 * Invalid Field in CDB, just retry
2014 * silently with RC10 */
2015 return -EINVAL;
3233ac19
JB		 2016 if (sense_valid &&
2017 sshdr.sense_key == UNIT_ATTENTION &&
2018 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2019 /* Device reset might occur several times,
2020 * give it one more chance */
2021 if (--reset_retries > 0)
2022 continue;
2b301307 2023 }
1da177e4
LT		 2024 retries--;
2025
2026 } while (the_result && retries);
2027
0da205e0 2028 if (the_result) {
e73aec82 2029 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 2030 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2031 return -EINVAL;
2032 }
e73aec82 2033
8f76d151
DH		 2034 sector_size = get_unaligned_be32(&buffer[8]);
2035 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2036
fe542396
MP		 2037 if (sd_read_protection_type(sdkp, buffer) < 0) {
2038 sdkp->capacity = 0;
2039 return -ENODEV;
2040 }
0da205e0
MW		 2041
2042 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2043 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2044 "kernel compiled with support for large block "
2045 "devices.\n");
2046 sdkp->capacity = 0;
2047 return -EOVERFLOW;
2048 }
2049
ea09bcc9 2050 /* Logical blocks per physical block exponent */
526f7c79 2051 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2052
2053 /* Lowest aligned logical block */
2054 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2055 blk_queue_alignment_offset(sdp->request_queue, alignment);
2056 if (alignment && sdkp->first_scan)
2057 sd_printk(KERN_NOTICE, sdkp,
2058 "physical block alignment offset: %u\n", alignment);
2059
c98a0eb0
MP		 2060 if (buffer[14] & 0x80) { /* LBPME */
2061 sdkp->lbpme = 1;
e339c1a7 2062
c98a0eb0
MP		 2063 if (buffer[14] & 0x40) /* LBPRZ */
2064 sdkp->lbprz = 1;
e339c1a7 2065
c98a0eb0 2066 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2067 }
2068
0da205e0
MW		 2069 sdkp->capacity = lba + 1;
2070 return sector_size;
2071}
2072
2073static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2074 unsigned char *buffer)
2075{
2076 unsigned char cmd[16];
2077 struct scsi_sense_hdr sshdr;
2078 int sense_valid = 0;
2079 int the_result;
3233ac19 2080 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2081 sector_t lba;
2082 unsigned sector_size;
2083
2084 do {
2085 cmd[0] = READ_CAPACITY;
2086 memset(&cmd[1], 0, 9);
2087 memset(buffer, 0, 8);
2088
2089 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2090 buffer, 8, &sshdr,
2091 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2092
2093 if (media_not_present(sdkp, &sshdr))
2094 return -ENODEV;
2095
3233ac19 2096 if (the_result) {
0da205e0 2097 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2098 if (sense_valid &&
2099 sshdr.sense_key == UNIT_ATTENTION &&
2100 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2101 /* Device reset might occur several times,
2102 * give it one more chance */
2103 if (--reset_retries > 0)
2104 continue;
2105 }
0da205e0
MW		 2106 retries--;
2107
2108 } while (the_result && retries);
2109
2110 if (the_result) {
2111 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2112 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2113 return -EINVAL;
2114 }
2115
8f76d151
DH		 2116 sector_size = get_unaligned_be32(&buffer[4]);
2117 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2118
5ce524bd
HG		 2119 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2120 /* Some buggy (usb cardreader) devices return an lba of
2121 0xffffffff when the want to report a size of 0 (with
2122 which they really mean no media is present) */
2123 sdkp->capacity = 0;
5cc10350 2124 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2125 return sector_size;
2126 }
2127
0da205e0
MW		 2128 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2129 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2130 "kernel compiled with support for large block "
2131 "devices.\n");
2132 sdkp->capacity = 0;
2133 return -EOVERFLOW;
2134 }
2135
2136 sdkp->capacity = lba + 1;
526f7c79 2137 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2138 return sector_size;
2139}
2140
2b301307
MW		 2141static int sd_try_rc16_first(struct scsi_device *sdp)
2142{
f87146bb
HR		 2143 if (sdp->host->max_cmd_len < 16)
2144 return 0;
6a0bdffa
AS		 2145 if (sdp->try_rc_10_first)
2146 return 0;
2b301307
MW		 2147 if (sdp->scsi_level > SCSI_SPC_2)
2148 return 1;
2149 if (scsi_device_protection(sdp))
2150 return 1;
2151 return 0;
2152}
2153
0da205e0
MW		 2154/*
2155 * read disk capacity
2156 */
2157static void
2158sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2159{
2160 int sector_size;
2161 struct scsi_device *sdp = sdkp->device;
70a9b873 2162 sector_t old_capacity = sdkp->capacity;
0da205e0 2163
2b301307 2164 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2165 sector_size = read_capacity_16(sdkp, sdp, buffer);
2166 if (sector_size == -EOVERFLOW)
1da177e4 2167 goto got_data;
2b301307
MW		 2168 if (sector_size == -ENODEV)
2169 return;
2170 if (sector_size < 0)
2171 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2172 if (sector_size < 0)
2173 return;
1da177e4 2174 } else {
0da205e0
MW		 2175 sector_size = read_capacity_10(sdkp, sdp, buffer);
2176 if (sector_size == -EOVERFLOW)
2177 goto got_data;
2178 if (sector_size < 0)
2179 return;
2180 if ((sizeof(sdkp->capacity) > 4) &&
2181 (sdkp->capacity > 0xffffffffULL)) {
2182 int old_sector_size = sector_size;
2183 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2184 "Trying to use READ CAPACITY(16).\n");
2185 sector_size = read_capacity_16(sdkp, sdp, buffer);
2186 if (sector_size < 0) {
2187 sd_printk(KERN_NOTICE, sdkp,
2188 "Using 0xffffffff as device size\n");
2189 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2190 sector_size = old_sector_size;
2191 goto got_data;
2192 }
2193 }
2194 }
1da177e4 2195
5c211caa
AS		 2196 /* Some devices are known to return the total number of blocks,
2197 * not the highest block number. Some devices have versions
2198 * which do this and others which do not. Some devices we might
2199 * suspect of doing this but we don't know for certain.
2200 *
2201 * If we know the reported capacity is wrong, decrement it. If
2202 * we can only guess, then assume the number of blocks is even
2203 * (usually true but not always) and err on the side of lowering
2204 * the capacity.
2205 */
2206 if (sdp->fix_capacity ||
2207 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2208 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2209 "from its reported value: %llu\n",
2210 (unsigned long long) sdkp->capacity);
1da177e4 2211 --sdkp->capacity;
61bf54b7
ON		 2212 }
2213
1da177e4
LT		 2214got_data:
2215 if (sector_size == 0) {
2216 sector_size = 512;
e73aec82
MP		 2217 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2218 "assuming 512.\n");
1da177e4
LT		 2219 }
2220
2221 if (sector_size != 512 &&
2222 sector_size != 1024 &&
2223 sector_size != 2048 &&
2224 sector_size != 4096 &&
2225 sector_size != 256) {
e73aec82
MP		 2226 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2227 sector_size);
1da177e4
LT		 2228 /*
2229 * The user might want to re-format the drive with
2230 * a supported sectorsize. Once this happens, it
2231 * would be relatively trivial to set the thing up.
2232 * For this reason, we leave the thing in the table.
2233 */
2234 sdkp->capacity = 0;
2235 /*
2236 * set a bogus sector size so the normal read/write
2237 * logic in the block layer will eventually refuse any
2238 * request on this device without tripping over power
2239 * of two sector size assumptions
2240 */
2241 sector_size = 512;
2242 }
e1defc4f 2243 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2244
1da177e4 2245 {
7404ad3b 2246 char cap_str_2[10], cap_str_10[10];
520a2c27 2247 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2248
7404ad3b
JB		 2249 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2250 sizeof(cap_str_2));
2251 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2252 sizeof(cap_str_10));
1da177e4 2253
ea09bcc9 2254 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2255 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2256 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2257 (unsigned long long)sdkp->capacity,
2258 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2259
526f7c79 2260 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2261 sd_printk(KERN_NOTICE, sdkp,
2262 "%u-byte physical blocks\n",
526f7c79 2263 sdkp->physical_block_size);
ea09bcc9 2264 }
1da177e4
LT		 2265 }
2266
bcdb247c
MP		 2267 if (sdkp->capacity > 0xffffffff) {
2268 sdp->use_16_for_rw = 1;
2269 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS;
2270 } else
2271 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
53ad570b 2272
1da177e4
LT		 2273 /* Rescale capacity to 512-byte units */
2274 if (sector_size == 4096)
2275 sdkp->capacity <<= 3;
2276 else if (sector_size == 2048)
2277 sdkp->capacity <<= 2;
2278 else if (sector_size == 1024)
2279 sdkp->capacity <<= 1;
2280 else if (sector_size == 256)
2281 sdkp->capacity >>= 1;
2282
526f7c79
MP		 2283 blk_queue_physical_block_size(sdp->request_queue,
2284 sdkp->physical_block_size);
1da177e4
LT		 2285 sdkp->device->sector_size = sector_size;
2286}
2287
2288/* called with buffer of length 512 */
2289static inline int
ea73a9f2
JB		 2290sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2291 unsigned char *buffer, int len, struct scsi_mode_data *data,
2292 struct scsi_sense_hdr *sshdr)
1da177e4 2293{
ea73a9f2 2294 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2295 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2296 sshdr);
1da177e4
LT		 2297}
2298
2299/*
2300 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2301 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2302 */
2303static void
e73aec82 2304sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2305{
1da177e4 2306 int res;
ea73a9f2 2307 struct scsi_device *sdp = sdkp->device;
1da177e4 2308 struct scsi_mode_data data;
70a9b873 2309 int old_wp = sdkp->write_prot;
1da177e4
LT		 2310
2311 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2312 if (sdp->skip_ms_page_3f) {
b2bff6ce 2313 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2314 return;
2315 }
2316
ea73a9f2
JB		 2317 if (sdp->use_192_bytes_for_3f) {
2318 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2319 } else {
2320 /*
2321 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2322 * We have to start carefully: some devices hang if we ask
2323 * for more than is available.
2324 */
ea73a9f2 2325 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2326
2327 /*
2328 * Second attempt: ask for page 0 When only page 0 is
2329 * implemented, a request for page 3F may return Sense Key
2330 * 5: Illegal Request, Sense Code 24: Invalid field in
2331 * CDB.
2332 */
2333 if (!scsi_status_is_good(res))
ea73a9f2 2334 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2335
2336 /*
2337 * Third attempt: ask 255 bytes, as we did earlier.
2338 */
2339 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2340 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2341 &data, NULL);
1da177e4
LT		 2342 }
2343
2344 if (!scsi_status_is_good(res)) {
b2bff6ce 2345 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2346 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2347 } else {
2348 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2349 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2350 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2351 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2352 sdkp->write_prot ? "on" : "off");
2353 sd_printk(KERN_DEBUG, sdkp,
2354 "Mode Sense: %02x %02x %02x %02x\n",
2355 buffer[0], buffer[1], buffer[2], buffer[3]);
2356 }
1da177e4
LT		 2357 }
2358}
2359
2360/*
2361 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2362 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2363 */
2364static void
e73aec82 2365sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2366{
1da177e4 2367 int len = 0, res;
ea73a9f2 2368 struct scsi_device *sdp = sdkp->device;
1da177e4 2369
631e8a13
AV		 2370 int dbd;
2371 int modepage;
0bcaa111 2372 int first_len;
1da177e4
LT		 2373 struct scsi_mode_data data;
2374 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2375 int old_wce = sdkp->WCE;
2376 int old_rcd = sdkp->RCD;
2377 int old_dpofua = sdkp->DPOFUA;
1da177e4 2378
39c60a09
JB		 2379
2380 if (sdkp->cache_override)
2381 return;
2382
0bcaa111
LT		 2383 first_len = 4;
2384 if (sdp->skip_ms_page_8) {
2385 if (sdp->type == TYPE_RBC)
2386 goto defaults;
2387 else {
2388 if (sdp->skip_ms_page_3f)
2389 goto defaults;
2390 modepage = 0x3F;
2391 if (sdp->use_192_bytes_for_3f)
2392 first_len = 192;
2393 dbd = 0;
2394 }
2395 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2396 modepage = 6;
2397 dbd = 8;
2398 } else {
2399 modepage = 8;
2400 dbd = 0;
2401 }
2402
1da177e4 2403 /* cautiously ask */
0bcaa111
LT		 2404 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2405 &data, &sshdr);
1da177e4
LT		 2406
2407 if (!scsi_status_is_good(res))
2408 goto bad_sense;
2409
6d73c851
AV		 2410 if (!data.header_length) {
2411 modepage = 6;
0bcaa111 2412 first_len = 0;
b2bff6ce
MP		 2413 sd_first_printk(KERN_ERR, sdkp,
2414 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2415 }
2416
1da177e4
LT		 2417 /* that went OK, now ask for the proper length */
2418 len = data.length;
2419
2420 /*
2421 * We're only interested in the first three bytes, actually.
2422 * But the data cache page is defined for the first 20.
2423 */
2424 if (len < 3)
2425 goto bad_sense;
0bcaa111 2426 else if (len > SD_BUF_SIZE) {
b2bff6ce 2427 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2428 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2429 len = SD_BUF_SIZE;
2430 }
2431 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2432 len = 192;
1da177e4
LT		 2433
2434 /* Get the data */
0bcaa111
LT		 2435 if (len > first_len)
2436 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2437 &data, &sshdr);
1da177e4
LT		 2438
2439 if (scsi_status_is_good(res)) {
631e8a13 2440 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2441
0bcaa111
LT		 2442 while (offset < len) {
2443 u8 page_code = buffer[offset] & 0x3F;
2444 u8 spf = buffer[offset] & 0x40;
2445
2446 if (page_code == 8 || page_code == 6) {
2447 /* We're interested only in the first 3 bytes.
2448 */
2449 if (len - offset <= 2) {
b2bff6ce
MP		 2450 sd_first_printk(KERN_ERR, sdkp,
2451 "Incomplete mode parameter "
2452 "data\n");
0bcaa111
LT		 2453 goto defaults;
2454 } else {
2455 modepage = page_code;
2456 goto Page_found;
2457 }
2458 } else {
2459 /* Go to the next page */
2460 if (spf && len - offset > 3)
2461 offset += 4 + (buffer[offset+2] << 8) +
2462 buffer[offset+3];
2463 else if (!spf && len - offset > 1)
2464 offset += 2 + buffer[offset+1];
2465 else {
b2bff6ce
MP		 2466 sd_first_printk(KERN_ERR, sdkp,
2467 "Incomplete mode "
2468 "parameter data\n");
0bcaa111
LT		 2469 goto defaults;
2470 }
2471 }
48970800
AV		 2472 }
2473
b2bff6ce 2474 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2475 goto defaults;
2476
0bcaa111 2477 Page_found:
631e8a13
AV		 2478 if (modepage == 8) {
2479 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2480 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2481 } else {
2482 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2483 sdkp->RCD = 0;
2484 }
1da177e4 2485
007365ad 2486 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2487 if (sdp->broken_fua) {
2488 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2489 sdkp->DPOFUA = 0;
2490 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
b2bff6ce 2491 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2492 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2493 sdkp->DPOFUA = 0;
2494 }
2495
70a9b873
MP		 2496 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2497 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2498 sd_printk(KERN_NOTICE, sdkp,
2499 "Write cache: %s, read cache: %s, %s\n",
2500 sdkp->WCE ? "enabled" : "disabled",
2501 sdkp->RCD ? "disabled" : "enabled",
2502 sdkp->DPOFUA ? "supports DPO and FUA"
2503 : "doesn't support DPO or FUA");
1da177e4
LT		 2504
2505 return;
2506 }
2507
2508bad_sense:
ea73a9f2 2509 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2510 sshdr.sense_key == ILLEGAL_REQUEST &&
2511 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2512 /* Invalid field in CDB */
b2bff6ce 2513 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2514 else
b2bff6ce
MP		 2515 sd_first_printk(KERN_ERR, sdkp,
2516 "Asking for cache data failed\n");
1da177e4
LT		 2517
2518defaults:
b81478d8 2519 if (sdp->wce_default_on) {
b2bff6ce
MP		 2520 sd_first_printk(KERN_NOTICE, sdkp,
2521 "Assuming drive cache: write back\n");
b81478d8
NJ		 2522 sdkp->WCE = 1;
2523 } else {
b2bff6ce
MP		 2524 sd_first_printk(KERN_ERR, sdkp,
2525 "Assuming drive cache: write through\n");
b81478d8
NJ		 2526 sdkp->WCE = 0;
2527 }
1da177e4 2528 sdkp->RCD = 0;
48970800 2529 sdkp->DPOFUA = 0;
1da177e4
LT		 2530}
2531
e0597d70
MP		 2532/*
2533 * The ATO bit indicates whether the DIF application tag is available
2534 * for use by the operating system.
2535 */
439d77f7 2536static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2537{
2538 int res, offset;
2539 struct scsi_device *sdp = sdkp->device;
2540 struct scsi_mode_data data;
2541 struct scsi_sense_hdr sshdr;
2542
2543 if (sdp->type != TYPE_DISK)
2544 return;
2545
2546 if (sdkp->protection_type == 0)
2547 return;
2548
2549 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2550 SD_MAX_RETRIES, &data, &sshdr);
2551
2552 if (!scsi_status_is_good(res) || !data.header_length ||
2553 data.length < 6) {
b2bff6ce 2554 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2555 "getting Control mode page failed, assume no ATO\n");
2556
2557 if (scsi_sense_valid(&sshdr))
2558 sd_print_sense_hdr(sdkp, &sshdr);
2559
2560 return;
2561 }
2562
2563 offset = data.header_length + data.block_descriptor_length;
2564
2565 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2566 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2567 return;
2568 }
2569
2570 if ((buffer[offset + 5] & 0x80) == 0)
2571 return;
2572
2573 sdkp->ATO = 1;
2574
2575 return;
2576}
2577
d11b6916
MP		 2578/**
2579 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2580 * @disk: disk to query
2581 */
2582static void sd_read_block_limits(struct scsi_disk *sdkp)
2583{
2584 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2585 const int vpd_len = 64;
bcdb247c 2586 u32 max_xfer_length;
e3deec09 2587 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2588
e3deec09
JB		 2589 if (!buffer ||
2590 /* Block Limits VPD */
2591 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2592 goto out;
d11b6916 2593
bcdb247c
MP		 2594 max_xfer_length = get_unaligned_be32(&buffer[8]);
2595 if (max_xfer_length)
2596 sdkp->max_xfer_blocks = max_xfer_length;
2597
d11b6916
MP		 2598 blk_queue_io_min(sdkp->disk->queue,
2599 get_unaligned_be16(&buffer[6]) * sector_sz);
2600 blk_queue_io_opt(sdkp->disk->queue,
2601 get_unaligned_be32(&buffer[12]) * sector_sz);
2602
c98a0eb0
MP		 2603 if (buffer[3] == 0x3c) {
2604 unsigned int lba_count, desc_count;
e339c1a7 2605
5db44863 2606 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2607
c98a0eb0 2608 if (!sdkp->lbpme)
045d3fe7 2609 goto out;
045d3fe7 2610
c98a0eb0
MP		 2611 lba_count = get_unaligned_be32(&buffer[20]);
2612 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2613
c98a0eb0
MP		 2614 if (lba_count && desc_count)
2615 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2616
c98a0eb0 2617 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2618
2619 if (buffer[32] & 0x80)
c98a0eb0 2620 sdkp->unmap_alignment =
e339c1a7 2621 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2622
2623 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2624
2625 if (sdkp->max_unmap_blocks)
2626 sd_config_discard(sdkp, SD_LBP_UNMAP);
2627 else
2628 sd_config_discard(sdkp, SD_LBP_WS16);
2629
2630 } else { /* LBP VPD page tells us what to use */
2631
2632 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2633 sd_config_discard(sdkp, SD_LBP_UNMAP);
2634 else if (sdkp->lbpws)
2635 sd_config_discard(sdkp, SD_LBP_WS16);
2636 else if (sdkp->lbpws10)
2637 sd_config_discard(sdkp, SD_LBP_WS10);
2638 else
2639 sd_config_discard(sdkp, SD_LBP_DISABLE);
2640 }
e339c1a7
MP		 2641 }
2642
e3deec09 2643 out:
d11b6916
MP		 2644 kfree(buffer);
2645}
2646
3821d768
MP		 2647/**
2648 * sd_read_block_characteristics - Query block dev. characteristics
2649 * @disk: disk to query
2650 */
2651static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2652{
e3deec09 2653 unsigned char *buffer;
3821d768 2654 u16 rot;
bb2d3de1 2655 const int vpd_len = 64;
3821d768 2656
e3deec09 2657 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2658
e3deec09
JB		 2659 if (!buffer ||
2660 /* Block Device Characteristics VPD */
2661 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2662 goto out;
3821d768
MP		 2663
2664 rot = get_unaligned_be16(&buffer[4]);
2665
2666 if (rot == 1)
2667 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2668
e3deec09 2669 out:
3821d768
MP		 2670 kfree(buffer);
2671}
2672
045d3fe7 2673/**
c98a0eb0 2674 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2675 * @disk: disk to query
2676 */
c98a0eb0 2677static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2678{
2679 unsigned char *buffer;
2680 const int vpd_len = 8;
2681
c98a0eb0 2682 if (sdkp->lbpme == 0)
045d3fe7
MP		 2683 return;
2684
2685 buffer = kmalloc(vpd_len, GFP_KERNEL);
2686
2687 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2688 goto out;
2689
c98a0eb0
MP		 2690 sdkp->lbpvpd = 1;
2691 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2692 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2693 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2694
2695 out:
2696 kfree(buffer);
2697}
2698
5db44863
MP		 2699static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2700{
66c28f97
MP		 2701 struct scsi_device *sdev = sdkp->device;
2702
54b2b50c
MP		 2703 if (sdev->host->no_write_same) {
2704 sdev->no_write_same = 1;
2705
2706 return;
2707 }
2708
66c28f97 2709 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2710 /* too large values might cause issues with arcmsr */
2711 int vpd_buf_len = 64;
2712
66c28f97
MP		 2713 sdev->no_report_opcodes = 1;
2714
2715 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2716 * CODES is unsupported and the device has an ATA
2717 * Information VPD page (SAT).
2718 */
af73623f 2719 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2720 sdev->no_write_same = 1;
2721 }
2722
2723 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2724 sdkp->ws16 = 1;
66c28f97
MP		 2725
2726 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2727 sdkp->ws10 = 1;
5db44863
MP		 2728}
2729
ffd4bc2a
MP		 2730static int sd_try_extended_inquiry(struct scsi_device *sdp)
2731{
2732 /*
2733 * Although VPD inquiries can go to SCSI-2 type devices,
2734 * some USB ones crash on receiving them, and the pages
2735 * we currently ask for are for SPC-3 and beyond
2736 */
09b6b51b 2737 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2738 return 1;
2739 return 0;
2740}
2741
1da177e4
LT		 2742/**
2743 * sd_revalidate_disk - called the first time a new disk is seen,
2744 * performs disk spin up, read_capacity, etc.
2745 * @disk: struct gendisk we care about
2746 **/
2747static int sd_revalidate_disk(struct gendisk *disk)
2748{
2749 struct scsi_disk *sdkp = scsi_disk(disk);
2750 struct scsi_device *sdp = sdkp->device;
1da177e4 2751 unsigned char *buffer;
bcdb247c 2752 unsigned int max_xfer;
1da177e4 2753
fa0d34be
MP		 2754 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2755 "sd_revalidate_disk\n"));
1da177e4
LT		 2756
2757 /*
2758 * If the device is offline, don't try and read capacity or any
2759 * of the other niceties.
2760 */
2761 if (!scsi_device_online(sdp))
2762 goto out;
2763
a6123f14 2764 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2765 if (!buffer) {
e73aec82
MP		 2766 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2767 "allocation failure.\n");
ea73a9f2 2768 goto out;
1da177e4
LT		 2769 }
2770
e73aec82 2771 sd_spinup_disk(sdkp);
1da177e4
LT		 2772
2773 /*
2774 * Without media there is no reason to ask; moreover, some devices
2775 * react badly if we do.
2776 */
2777 if (sdkp->media_present) {
e73aec82 2778 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2779
2780 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2781 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2782 sd_read_block_limits(sdkp);
2783 sd_read_block_characteristics(sdkp);
2784 }
2785
e73aec82
MP		 2786 sd_read_write_protect_flag(sdkp, buffer);
2787 sd_read_cache_type(sdkp, buffer);
e0597d70 2788 sd_read_app_tag_own(sdkp, buffer);
5db44863 2789 sd_read_write_same(sdkp, buffer);
1da177e4 2790 }
461d4e90 2791
70a9b873
MP		 2792 sdkp->first_scan = 0;
2793
461d4e90
TH		 2794 /*
2795 * We now have all cache related info, determine how we deal
4913efe4 2796 * with flush requests.
461d4e90 2797 */
cb2fb68d 2798 sd_set_flush_flag(sdkp);
461d4e90 2799
bcdb247c
MP		 2800 max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue),
2801 sdkp->max_xfer_blocks);
2802 max_xfer <<= ilog2(sdp->sector_size) - 9;
2803 blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer);
1da177e4 2804 set_capacity(disk, sdkp->capacity);
5db44863 2805 sd_config_write_same(sdkp);
1da177e4
LT		 2806 kfree(buffer);
2807
1da177e4
LT		 2808 out:
2809 return 0;
2810}
2811
72ec24bd
TH		 2812/**
2813 * sd_unlock_native_capacity - unlock native capacity
2814 * @disk: struct gendisk to set capacity for
2815 *
2816 * Block layer calls this function if it detects that partitions
2817 * on @disk reach beyond the end of the device. If the SCSI host
2818 * implements ->unlock_native_capacity() method, it's invoked to
2819 * give it a chance to adjust the device capacity.
2820 *
2821 * CONTEXT:
2822 * Defined by block layer. Might sleep.
2823 */
2824static void sd_unlock_native_capacity(struct gendisk *disk)
2825{
2826 struct scsi_device *sdev = scsi_disk(disk)->device;
2827
2828 if (sdev->host->hostt->unlock_native_capacity)
2829 sdev->host->hostt->unlock_native_capacity(sdev);
2830}
2831
3e1a7ff8
TH		 2832/**
2833 * sd_format_disk_name - format disk name
2834 * @prefix: name prefix - ie. "sd" for SCSI disks
2835 * @index: index of the disk to format name for
2836 * @buf: output buffer
2837 * @buflen: length of the output buffer
2838 *
2839 * SCSI disk names starts at sda. The 26th device is sdz and the
2840 * 27th is sdaa. The last one for two lettered suffix is sdzz
2841 * which is followed by sdaaa.
2842 *
2843 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2844 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2845 * determined using similar method as 26 base conversion with the
2846 * index shifted -1 after each digit is computed.
2847 *
2848 * CONTEXT:
2849 * Don't care.
2850 *
2851 * RETURNS:
2852 * 0 on success, -errno on failure.
2853 */
2854static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2855{
2856 const int base = 'z' - 'a' + 1;
2857 char *begin = buf + strlen(prefix);
2858 char *end = buf + buflen;
2859 char *p;
2860 int unit;
2861
2862 p = end - 1;
2863 *p = '\0';
2864 unit = base;
2865 do {
2866 if (p == begin)
2867 return -EINVAL;
2868 *--p = 'a' + (index % unit);
2869 index = (index / unit) - 1;
2870 } while (index >= 0);
2871
2872 memmove(begin, p, end - p);
2873 memcpy(buf, prefix, strlen(prefix));
2874
2875 return 0;
2876}
2877
4ace92fc
AV		 2878/*
2879 * The asynchronous part of sd_probe
2880 */
2881static void sd_probe_async(void *data, async_cookie_t cookie)
2882{
2883 struct scsi_disk *sdkp = data;
2884 struct scsi_device *sdp;
2885 struct gendisk *gd;
2886 u32 index;
2887 struct device *dev;
2888
2889 sdp = sdkp->device;
2890 gd = sdkp->disk;
2891 index = sdkp->index;
2892 dev = &sdp->sdev_gendev;
2893
1a03ae0f
MR		 2894 gd->major = sd_major((index & 0xf0) >> 4);
2895 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2896 gd->minors = SD_MINORS;
2897
4ace92fc
AV		 2898 gd->fops = &sd_fops;
2899 gd->private_data = &sdkp->driver;
2900 gd->queue = sdkp->device->request_queue;
2901
70a9b873
MP		 2902 /* defaults, until the device tells us otherwise */
2903 sdp->sector_size = 512;
2904 sdkp->capacity = 0;
2905 sdkp->media_present = 1;
2906 sdkp->write_prot = 0;
39c60a09 2907 sdkp->cache_override = 0;
70a9b873
MP		 2908 sdkp->WCE = 0;
2909 sdkp->RCD = 0;
2910 sdkp->ATO = 0;
2911 sdkp->first_scan = 1;
18a4d0a2 2912 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2913
4ace92fc
AV		 2914 sd_revalidate_disk(gd);
2915
4ace92fc 2916 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2917 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2918 if (sdp->removable) {
4ace92fc 2919 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2920 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2921 }
4ace92fc 2922
10c580e4 2923 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2924 add_disk(gd);
fe542396
MP		 2925 if (sdkp->capacity)
2926 sd_dif_config_host(sdkp);
4ace92fc 2927
3821d768
MP		 2928 sd_revalidate_disk(gd);
2929
4ace92fc
AV		 2930 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2931 sdp->removable ? "removable " : "");
478a8a05 2932 scsi_autopm_put_device(sdp);
ea038f63 2933 put_device(&sdkp->dev);
4ace92fc
AV		 2934}
2935
1da177e4
LT		 2936/**
2937 * sd_probe - called during driver initialization and whenever a
2938 * new scsi device is attached to the system. It is called once
2939 * for each scsi device (not just disks) present.
2940 * @dev: pointer to device object
2941 *
2942 * Returns 0 if successful (or not interested in this scsi device
2943 * (e.g. scanner)); 1 when there is an error.
2944 *
2945 * Note: this function is invoked from the scsi mid-level.
2946 * This function sets up the mapping between a given
2947 * <host,channel,id,lun> (found in sdp) and new device name
2948 * (e.g. /dev/sda). More precisely it is the block device major
2949 * and minor number that is chosen here.
2950 *
2db93ce8
PU		 2951 * Assume sd_probe is not re-entrant (for time being)
2952 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2953 **/
2954static int sd_probe(struct device *dev)
2955{
2956 struct scsi_device *sdp = to_scsi_device(dev);
2957 struct scsi_disk *sdkp;
2958 struct gendisk *gd;
439d77f7 2959 int index;
1da177e4
LT		 2960 int error;
2961
2962 error = -ENODEV;
631e8a13 2963 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2964 goto out;
2965
9ccfc756 2966 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2967 "sd_probe\n"));
1da177e4
LT		 2968
2969 error = -ENOMEM;
24669f75 2970 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2971 if (!sdkp)
2972 goto out;
2973
689d6fac 2974 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2975 if (!gd)
2976 goto out_free;
2977
f27bac27
TH		 2978 do {
2979 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2980 goto out_put;
1da177e4 2981
4034cc68 2982 spin_lock(&sd_index_lock);
f27bac27 2983 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2984 spin_unlock(&sd_index_lock);
f27bac27 2985 } while (error == -EAGAIN);
1da177e4 2986
21208ae5
DK		 2987 if (error) {
2988 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2989 goto out_put;
1a03ae0f
MR		 2990 }
2991
3e1a7ff8 2992 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2993 if (error) {
2994 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2995 goto out_free_index;
21208ae5 2996 }
f27bac27 2997
1da177e4
LT		 2998 sdkp->device = sdp;
2999 sdkp->driver = &sd_template;
3000 sdkp->disk = gd;
3001 sdkp->index = index;
409f3499 3002 atomic_set(&sdkp->openers, 0);
9e1a1537 3003 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 3004
601e7638
JB		 3005 if (!sdp->request_queue->rq_timeout) {
3006 if (sdp->type != TYPE_MOD)
3007 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3008 else
3009 blk_queue_rq_timeout(sdp->request_queue,
3010 SD_MOD_TIMEOUT);
3011 }
3012
3013 device_initialize(&sdkp->dev);
478a8a05 3014 sdkp->dev.parent = dev;
601e7638 3015 sdkp->dev.class = &sd_disk_class;
02aa2a37 3016 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638
JB		 3017
3018 if (device_add(&sdkp->dev))
3019 goto out_free_index;
3020
478a8a05
AS		 3021 get_device(dev);
3022 dev_set_drvdata(dev, sdkp);
601e7638 3023
ea038f63 3024 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3025 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3026
3027 return 0;
3028
f27bac27 3029 out_free_index:
4034cc68 3030 spin_lock(&sd_index_lock);
f27bac27 3031 ida_remove(&sd_index_ida, index);
4034cc68 3032 spin_unlock(&sd_index_lock);
6bdaa1f1 3033 out_put:
1da177e4 3034 put_disk(gd);
6bdaa1f1 3035 out_free:
1da177e4 3036 kfree(sdkp);
6bdaa1f1 3037 out:
1da177e4
LT		 3038 return error;
3039}
3040
3041/**
3042 * sd_remove - called whenever a scsi disk (previously recognized by
3043 * sd_probe) is detached from the system. It is called (potentially
3044 * multiple times) during sd module unload.
3045 * @sdp: pointer to mid level scsi device object
3046 *
3047 * Note: this function is invoked from the scsi mid-level.
3048 * This function potentially frees up a device name (e.g. /dev/sdc)
3049 * that could be re-used by a subsequent sd_probe().
3050 * This function is not called when the built-in sd driver is "exit-ed".
3051 **/
3052static int sd_remove(struct device *dev)
3053{
601e7638 3054 struct scsi_disk *sdkp;
0761df9c 3055 dev_t devt;
1da177e4 3056
601e7638 3057 sdkp = dev_get_drvdata(dev);
0761df9c 3058 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3059 scsi_autopm_get_device(sdkp->device);
3060
3c31b52f 3061 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3062 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3063 device_del(&sdkp->dev);
1da177e4
LT		 3064 del_gendisk(sdkp->disk);
3065 sd_shutdown(dev);
39b7f1e2 3066
0761df9c
HR		 3067 blk_register_region(devt, SD_MINORS, NULL,
3068 sd_default_probe, NULL, NULL);
3069
0b950672 3070 mutex_lock(&sd_ref_mutex);
39b7f1e2 3071 dev_set_drvdata(dev, NULL);
ee959b00 3072 put_device(&sdkp->dev);
0b950672 3073 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3074
3075 return 0;
3076}
3077
3078/**
3079 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3080 * @dev: pointer to embedded class device
1da177e4 3081 *
0b950672 3082 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3083 * called on last put, you should always use the scsi_disk_get()
3084 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3085 * and never do a direct put_device.
1da177e4 3086 **/
ee959b00 3087static void scsi_disk_release(struct device *dev)
1da177e4 3088{
ee959b00 3089 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3090 struct gendisk *disk = sdkp->disk;
3091
4034cc68 3092 spin_lock(&sd_index_lock);
f27bac27 3093 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3094 spin_unlock(&sd_index_lock);
1da177e4
LT		 3095
3096 disk->private_data = NULL;
1da177e4 3097 put_disk(disk);
39b7f1e2 3098 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3099
3100 kfree(sdkp);
3101}
3102
cc5d2c8c 3103static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3104{
3105 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3106 struct scsi_sense_hdr sshdr;
cc5d2c8c 3107 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3108 int res;
3109
3110 if (start)
3111 cmd[4] |= 1; /* START */
3112
d2886ea3
SR		 3113 if (sdp->start_stop_pwr_cond)
3114 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3115
c3c94c5a
TH		 3116 if (!scsi_device_online(sdp))
3117 return -ENODEV;
3118
9b21493c
LM		 3119 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3120 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3121 if (res) {
cc5d2c8c
JB		 3122 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3123 sd_print_result(sdkp, res);
c3c94c5a 3124 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3125 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3126 if (scsi_sense_valid(&sshdr) &&
3127 /* 0x3a is medium not present */
3128 sshdr.asc == 0x3a)
3129 res = 0;
c3c94c5a
TH		 3130 }
3131
95897910
ON		 3132 /* SCSI error codes must not go to the generic layer */
3133 if (res)
3134 return -EIO;
3135
3136 return 0;
c3c94c5a
TH		 3137}
3138
1da177e4
LT		 3139/*
3140 * Send a SYNCHRONIZE CACHE instruction down to the device through
3141 * the normal SCSI command structure. Wait for the command to
3142 * complete.
3143 */
3144static void sd_shutdown(struct device *dev)
3145{
39b7f1e2 3146 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3147
3148 if (!sdkp)
3149 return; /* this can happen */
3150
54f57588
LM		 3151 if (pm_runtime_suspended(dev))
3152 goto exit;
3153
95897910 3154 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3155 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3156 sd_sync_cache(sdkp);
39b7f1e2 3157 }
c3c94c5a 3158
cc5d2c8c
JB		 3159 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3160 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3161 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3162 }
3163
54f57588 3164exit:
39b7f1e2
AS		 3165 scsi_disk_put(sdkp);
3166}
1da177e4 3167
95897910 3168static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3169{
c3c94c5a 3170 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3171 int ret = 0;
c3c94c5a
TH		 3172
3173 if (!sdkp)
3174 return 0; /* this can happen */
3175
95897910 3176 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3177 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3178 ret = sd_sync_cache(sdkp);
95897910
ON		 3179 if (ret) {
3180 /* ignore OFFLINE device */
3181 if (ret == -ENODEV)
3182 ret = 0;
09ff92fe 3183 goto done;
95897910 3184 }
c3c94c5a
TH		 3185 }
3186
691e3d31 3187 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3188 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3189 /* an error is not worth aborting a system sleep */
cc5d2c8c 3190 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3191 if (ignore_stop_errors)
3192 ret = 0;
c3c94c5a
TH		 3193 }
3194
09ff92fe
AS		 3195done:
3196 scsi_disk_put(sdkp);
3197 return ret;
c3c94c5a
TH		 3198}
3199
95897910
ON		 3200static int sd_suspend_system(struct device *dev)
3201{
3202 return sd_suspend_common(dev, true);
3203}
3204
3205static int sd_suspend_runtime(struct device *dev)
3206{
3207 return sd_suspend_common(dev, false);
3208}
3209
c3c94c5a
TH		 3210static int sd_resume(struct device *dev)
3211{
c3c94c5a 3212 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3213 int ret = 0;
c3c94c5a 3214
cc5d2c8c 3215 if (!sdkp->device->manage_start_stop)
09ff92fe 3216 goto done;
c3c94c5a 3217
cc5d2c8c 3218 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3219 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3220
09ff92fe
AS		 3221done:
3222 scsi_disk_put(sdkp);
3223 return ret;
c3c94c5a
TH		 3224}
3225
1da177e4
LT		 3226/**
3227 * init_sd - entry point for this driver (both when built in or when
3228 * a module).
3229 *
3230 * Note: this function registers this driver with the scsi mid-level.
3231 **/
3232static int __init init_sd(void)
3233{
5e4009ba 3234 int majors = 0, i, err;
1da177e4
LT		 3235
3236 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3237
0761df9c
HR		 3238 for (i = 0; i < SD_MAJORS; i++) {
3239 if (register_blkdev(sd_major(i), "sd") != 0)
3240 continue;
3241 majors++;
3242 blk_register_region(sd_major(i), SD_MINORS, NULL,
3243 sd_default_probe, NULL, NULL);
3244 }
1da177e4
LT		 3245
3246 if (!majors)
3247 return -ENODEV;
3248
5e4009ba
JG		 3249 err = class_register(&sd_disk_class);
3250 if (err)
3251 goto err_out;
6bdaa1f1 3252
4e7392ec
MP		 3253 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3254 0, 0, NULL);
3255 if (!sd_cdb_cache) {
3256 printk(KERN_ERR "sd: can't init extended cdb cache\n");
8d964478 3257 err = -ENOMEM;
4e7392ec
MP		 3258 goto err_out_class;
3259 }
3260
3261 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3262 if (!sd_cdb_pool) {
3263 printk(KERN_ERR "sd: can't init extended cdb pool\n");
8d964478 3264 err = -ENOMEM;
4e7392ec
MP		 3265 goto err_out_cache;
3266 }
3267
afd5e34b
JD		 3268 err = scsi_register_driver(&sd_template.gendrv);
3269 if (err)
3270 goto err_out_driver;
3271
5e4009ba
JG		 3272 return 0;
3273
afd5e34b
JD		 3274err_out_driver:
3275 mempool_destroy(sd_cdb_pool);
3276
4e7392ec
MP		 3277err_out_cache:
3278 kmem_cache_destroy(sd_cdb_cache);
3279
5e4009ba
JG		 3280err_out_class:
3281 class_unregister(&sd_disk_class);
3282err_out:
3283 for (i = 0; i < SD_MAJORS; i++)
3284 unregister_blkdev(sd_major(i), "sd");
3285 return err;
1da177e4
LT		 3286}
3287
3288/**
3289 * exit_sd - exit point for this driver (when it is a module).
3290 *
3291 * Note: this function unregisters this driver from the scsi mid-level.
3292 **/
3293static void __exit exit_sd(void)
3294{
3295 int i;
3296
3297 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3298
afd5e34b 3299 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3300 mempool_destroy(sd_cdb_pool);
3301 kmem_cache_destroy(sd_cdb_cache);
3302
5e4009ba
JG		 3303 class_unregister(&sd_disk_class);
3304
0761df9c
HR		 3305 for (i = 0; i < SD_MAJORS; i++) {
3306 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3307 unregister_blkdev(sd_major(i), "sd");
0761df9c 3308 }
1da177e4
LT		 3309}
3310
1da177e4
LT		 3311module_init(init_sd);
3312module_exit(exit_sd);
e73aec82
MP		 3313
3314static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3315 struct scsi_sense_hdr *sshdr)
3316{
2e4c3329 3317 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3318 scsi_show_sense_hdr(sshdr);
2e4c3329 3319 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3320 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3321}
3322
3323static void sd_print_result(struct scsi_disk *sdkp, int result)
3324{
2e4c3329 3325 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3326 scsi_show_result(result);
3327}
3328
Linux 6.x block layer and io_uring tree(s)