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clean up scary strncpy(dst, src, strlen(src)) uses
[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 *);
691e3d31 108static int sd_suspend(struct device *);
7b3d9545
LT		 109static int sd_resume(struct device *);
110static void sd_rescan(struct device *);
111static int sd_done(struct scsi_cmnd *);
18a4d0a2 112static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 113static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 114static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 115static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116static void sd_print_result(struct scsi_disk *, int);
117
4034cc68 118static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 119static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 120
121/* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
0b950672 124static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 125
439d77f7
HS		 126static struct kmem_cache *sd_cdb_cache;
127static mempool_t *sd_cdb_pool;
4e7392ec 128
6bdaa1f1
JB		 129static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
132};
133
ee959b00
TJ		 134static ssize_t
135sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
6bdaa1f1
JB		 137{
138 int i, ct = -1, rcd, wce, sp;
ee959b00 139 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
39c60a09 145 const char *temp = "temporary ";
6bdaa1f1
JB		 146 int len;
147
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
153
39c60a09
JB		 154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
159 }
160
6391a113 161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 162 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
167 }
168 }
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
39c60a09
JB		 173
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
178 }
179
6bdaa1f1
JB		 180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
a9312fb8 183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
190
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
e73aec82 194 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 195 return -EINVAL;
196 }
f98a8cae 197 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 198 return count;
199}
200
ee959b00
TJ		 201static ssize_t
202sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
c3c94c5a 204{
ee959b00 205 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 206 struct scsi_device *sdp = sdkp->device;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EACCES;
210
211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
212
213 return count;
214}
215
ee959b00
TJ		 216static ssize_t
217sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
a144c5ae 219{
ee959b00 220 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 221 struct scsi_device *sdp = sdkp->device;
222
223 if (!capable(CAP_SYS_ADMIN))
224 return -EACCES;
225
226 if (sdp->type != TYPE_DISK)
227 return -EINVAL;
228
229 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
230
231 return count;
232}
233
ee959b00
TJ		 234static ssize_t
235sd_show_cache_type(struct device *dev, struct device_attribute *attr,
236 char *buf)
6bdaa1f1 237{
ee959b00 238 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 239 int ct = sdkp->RCD + 2*sdkp->WCE;
240
241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
242}
243
ee959b00
TJ		 244static ssize_t
245sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 246{
ee959b00 247 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 248
249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
250}
251
ee959b00
TJ		 252static ssize_t
253sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
254 char *buf)
c3c94c5a 255{
ee959b00 256 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 257 struct scsi_device *sdp = sdkp->device;
258
259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
260}
261
ee959b00
TJ		 262static ssize_t
263sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
264 char *buf)
a144c5ae 265{
ee959b00 266 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 267
268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
269}
270
e0597d70
MP		 271static ssize_t
272sd_show_protection_type(struct device *dev, struct device_attribute *attr,
273 char *buf)
274{
275 struct scsi_disk *sdkp = to_scsi_disk(dev);
276
277 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
278}
279
8172499a
MP		 280static ssize_t
281sd_store_protection_type(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283{
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
285 unsigned int val;
286 int err;
287
288 if (!capable(CAP_SYS_ADMIN))
289 return -EACCES;
290
291 err = kstrtouint(buf, 10, &val);
292
293 if (err)
294 return err;
295
296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
297 sdkp->protection_type = val;
298
299 return count;
300}
301
518fa8e3
MP		 302static ssize_t
303sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
304 char *buf)
305{
306 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 struct scsi_device *sdp = sdkp->device;
308 unsigned int dif, dix;
309
310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
312
313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
314 dif = 0;
315 dix = 1;
316 }
317
318 if (!dif && !dix)
319 return snprintf(buf, 20, "none\n");
320
321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
322}
323
e0597d70
MP		 324static ssize_t
325sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
326 char *buf)
327{
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329
330 return snprintf(buf, 20, "%u\n", sdkp->ATO);
331}
332
e339c1a7
MP		 333static ssize_t
334sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
335 char *buf)
336{
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
338
c98a0eb0
MP		 339 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
340}
341
342static const char *lbp_mode[] = {
343 [SD_LBP_FULL] = "full",
344 [SD_LBP_UNMAP] = "unmap",
345 [SD_LBP_WS16] = "writesame_16",
346 [SD_LBP_WS10] = "writesame_10",
347 [SD_LBP_ZERO] = "writesame_zero",
348 [SD_LBP_DISABLE] = "disabled",
349};
350
351static ssize_t
352sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
353 char *buf)
354{
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
358}
359
360static ssize_t
361sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t count)
363{
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
365 struct scsi_device *sdp = sdkp->device;
366
367 if (!capable(CAP_SYS_ADMIN))
368 return -EACCES;
369
370 if (sdp->type != TYPE_DISK)
371 return -EINVAL;
372
373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
374 sd_config_discard(sdkp, SD_LBP_UNMAP);
375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
376 sd_config_discard(sdkp, SD_LBP_WS16);
377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
378 sd_config_discard(sdkp, SD_LBP_WS10);
379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
380 sd_config_discard(sdkp, SD_LBP_ZERO);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
382 sd_config_discard(sdkp, SD_LBP_DISABLE);
383 else
384 return -EINVAL;
385
386 return count;
e339c1a7
MP		 387}
388
18a4d0a2
MP		 389static ssize_t
390sd_show_max_medium_access_timeouts(struct device *dev,
391 struct device_attribute *attr, char *buf)
392{
393 struct scsi_disk *sdkp = to_scsi_disk(dev);
394
395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
396}
397
398static ssize_t
399sd_store_max_medium_access_timeouts(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402{
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404 int err;
405
406 if (!capable(CAP_SYS_ADMIN))
407 return -EACCES;
408
409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
410
411 return err ? err : count;
412}
413
5db44863
MP		 414static ssize_t
415sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
416 char *buf)
417{
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
421}
422
423static ssize_t
424sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
426{
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428 struct scsi_device *sdp = sdkp->device;
429 unsigned long max;
430 int err;
431
432 if (!capable(CAP_SYS_ADMIN))
433 return -EACCES;
434
435 if (sdp->type != TYPE_DISK)
436 return -EINVAL;
437
438 err = kstrtoul(buf, 10, &max);
439
440 if (err)
441 return err;
442
443 if (max == 0)
444 sdp->no_write_same = 1;
445 else if (max <= SD_MAX_WS16_BLOCKS)
446 sdkp->max_ws_blocks = max;
447
448 sd_config_write_same(sdkp);
449
450 return count;
451}
452
ee959b00 453static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 454 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
455 sd_store_cache_type),
456 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 457 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
458 sd_store_allow_restart),
c3c94c5a
TH		 459 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
460 sd_store_manage_start_stop),
8172499a
MP		 461 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
462 sd_store_protection_type),
518fa8e3 463 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 464 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 465 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 466 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
467 sd_store_provisioning_mode),
5db44863
MP		 468 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
469 sd_show_write_same_blocks, sd_store_write_same_blocks),
18a4d0a2
MP		 470 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
471 sd_show_max_medium_access_timeouts,
472 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 473 __ATTR_NULL,
474};
475
476static struct class sd_disk_class = {
477 .name = "scsi_disk",
478 .owner = THIS_MODULE,
ee959b00
TJ		 479 .dev_release = scsi_disk_release,
480 .dev_attrs = sd_disk_attrs,
6bdaa1f1 481};
1da177e4 482
691e3d31
AL		 483static const struct dev_pm_ops sd_pm_ops = {
484 .suspend = sd_suspend,
485 .resume = sd_resume,
486 .poweroff = sd_suspend,
487 .restore = sd_resume,
488 .runtime_suspend = sd_suspend,
489 .runtime_resume = sd_resume,
490};
491
1da177e4
LT		 492static struct scsi_driver sd_template = {
493 .owner = THIS_MODULE,
494 .gendrv = {
495 .name = "sd",
496 .probe = sd_probe,
497 .remove = sd_remove,
498 .shutdown = sd_shutdown,
691e3d31 499 .pm = &sd_pm_ops,
1da177e4
LT		 500 },
501 .rescan = sd_rescan,
7b3d9545 502 .done = sd_done,
18a4d0a2 503 .eh_action = sd_eh_action,
1da177e4
LT		 504};
505
506/*
507 * Device no to disk mapping:
508 *
509 * major disc2 disc p1
510 * |............|.............|....|....| <- dev_t
511 * 31 20 19 8 7 4 3 0
512 *
513 * Inside a major, we have 16k disks, however mapped non-
514 * contiguously. The first 16 disks are for major0, the next
515 * ones with major1, ... Disk 256 is for major0 again, disk 272
516 * for major1, ...
517 * As we stay compatible with our numbering scheme, we can reuse
518 * the well-know SCSI majors 8, 65--71, 136--143.
519 */
520static int sd_major(int major_idx)
521{
522 switch (major_idx) {
523 case 0:
524 return SCSI_DISK0_MAJOR;
525 case 1 ... 7:
526 return SCSI_DISK1_MAJOR + major_idx - 1;
527 case 8 ... 15:
528 return SCSI_DISK8_MAJOR + major_idx - 8;
529 default:
530 BUG();
531 return 0; /* shut up gcc */
532 }
533}
534
39b7f1e2 535static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 536{
537 struct scsi_disk *sdkp = NULL;
538
39b7f1e2
AS		 539 if (disk->private_data) {
540 sdkp = scsi_disk(disk);
541 if (scsi_device_get(sdkp->device) == 0)
ee959b00 542 get_device(&sdkp->dev);
39b7f1e2
AS		 543 else
544 sdkp = NULL;
545 }
546 return sdkp;
547}
548
549static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
550{
551 struct scsi_disk *sdkp;
552
0b950672 553 mutex_lock(&sd_ref_mutex);
39b7f1e2 554 sdkp = __scsi_disk_get(disk);
0b950672 555 mutex_unlock(&sd_ref_mutex);
1da177e4 556 return sdkp;
39b7f1e2 557}
1da177e4 558
39b7f1e2
AS		 559static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
560{
561 struct scsi_disk *sdkp;
562
0b950672 563 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 564 sdkp = dev_get_drvdata(dev);
565 if (sdkp)
566 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 567 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 568 return sdkp;
569}
570
571static void scsi_disk_put(struct scsi_disk *sdkp)
572{
573 struct scsi_device *sdev = sdkp->device;
574
0b950672 575 mutex_lock(&sd_ref_mutex);
ee959b00 576 put_device(&sdkp->dev);
1da177e4 577 scsi_device_put(sdev);
0b950672 578 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 579}
580
35e1a5d9
MP		 581static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
582{
583 unsigned int prot_op = SCSI_PROT_NORMAL;
584 unsigned int dix = scsi_prot_sg_count(scmd);
585
586 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
587 if (dif && dix)
588 prot_op = SCSI_PROT_READ_PASS;
589 else if (dif && !dix)
590 prot_op = SCSI_PROT_READ_STRIP;
591 else if (!dif && dix)
592 prot_op = SCSI_PROT_READ_INSERT;
593 } else {
594 if (dif && dix)
595 prot_op = SCSI_PROT_WRITE_PASS;
596 else if (dif && !dix)
597 prot_op = SCSI_PROT_WRITE_INSERT;
598 else if (!dif && dix)
599 prot_op = SCSI_PROT_WRITE_STRIP;
600 }
601
602 scsi_set_prot_op(scmd, prot_op);
603 scsi_set_prot_type(scmd, dif);
604}
605
c98a0eb0
MP		 606static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
607{
608 struct request_queue *q = sdkp->disk->queue;
609 unsigned int logical_block_size = sdkp->device->sector_size;
610 unsigned int max_blocks = 0;
611
612 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 613 q->limits.discard_alignment = sdkp->unmap_alignment *
614 logical_block_size;
c98a0eb0
MP		 615 q->limits.discard_granularity =
616 max(sdkp->physical_block_size,
617 sdkp->unmap_granularity * logical_block_size);
618
89730393
MP		 619 sdkp->provisioning_mode = mode;
620
c98a0eb0
MP		 621 switch (mode) {
622
623 case SD_LBP_DISABLE:
624 q->limits.max_discard_sectors = 0;
625 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
626 return;
627
628 case SD_LBP_UNMAP:
5db44863
MP		 629 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
630 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 631 break;
632
633 case SD_LBP_WS16:
5db44863
MP		 634 max_blocks = min_not_zero(sdkp->max_ws_blocks,
635 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 636 break;
637
638 case SD_LBP_WS10:
5db44863
MP		 639 max_blocks = min_not_zero(sdkp->max_ws_blocks,
640 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 641 break;
642
643 case SD_LBP_ZERO:
5db44863
MP		 644 max_blocks = min_not_zero(sdkp->max_ws_blocks,
645 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 646 q->limits.discard_zeroes_data = 1;
647 break;
648 }
649
650 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
651 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 652}
653
e339c1a7 654/**
26e85fcd 655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 656 * @sdp: scsi device to operate one
e339c1a7
MP		 657 * @rq: Request to prepare
658 *
659 * Will issue either UNMAP or WRITE SAME(16) depending on preference
660 * indicated by target device.
661 **/
26e85fcd 662static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 663{
664 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 665 sector_t sector = blk_rq_pos(rq);
666 unsigned int nr_sectors = blk_rq_sectors(rq);
667 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 668 unsigned int len;
f1126e95 669 int ret;
c98a0eb0 670 char *buf;
66ac0280 671 struct page *page;
e339c1a7 672
26e85fcd
MP		 673 sector >>= ilog2(sdp->sector_size) - 9;
674 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 675 rq->timeout = SD_TIMEOUT;
676
677 memset(rq->cmd, 0, rq->cmd_len);
678
66ac0280
CH		 679 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
680 if (!page)
681 return BLKPREP_DEFER;
682
c98a0eb0
MP		 683 switch (sdkp->provisioning_mode) {
684 case SD_LBP_UNMAP:
685 buf = page_address(page);
e339c1a7 686
66ac0280 687 rq->cmd_len = 10;
e339c1a7
MP		 688 rq->cmd[0] = UNMAP;
689 rq->cmd[8] = 24;
e339c1a7
MP		 690
691 put_unaligned_be16(6 + 16, &buf[0]);
692 put_unaligned_be16(16, &buf[2]);
693 put_unaligned_be64(sector, &buf[8]);
66ac0280 694 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 695
66ac0280 696 len = 24;
c98a0eb0
MP		 697 break;
698
699 case SD_LBP_WS16:
66ac0280 700 rq->cmd_len = 16;
e339c1a7
MP		 701 rq->cmd[0] = WRITE_SAME_16;
702 rq->cmd[1] = 0x8; /* UNMAP */
703 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 704 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
705
706 len = sdkp->device->sector_size;
c98a0eb0
MP		 707 break;
708
709 case SD_LBP_WS10:
710 case SD_LBP_ZERO:
711 rq->cmd_len = 10;
712 rq->cmd[0] = WRITE_SAME;
713 if (sdkp->provisioning_mode == SD_LBP_WS10)
714 rq->cmd[1] = 0x8; /* UNMAP */
715 put_unaligned_be32(sector, &rq->cmd[2]);
716 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
717
718 len = sdkp->device->sector_size;
719 break;
720
721 default:
09b9cc44 722 ret = BLKPREP_KILL;
c98a0eb0 723 goto out;
e339c1a7
MP		 724 }
725
66ac0280 726 blk_add_request_payload(rq, page, len);
f1126e95
FT		 727 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
728 rq->buffer = page_address(page);
26e85fcd 729 rq->__data_len = nr_bytes;
c98a0eb0
MP		 730
731out:
610a6349
FT		 732 if (ret != BLKPREP_OK) {
733 __free_page(page);
734 rq->buffer = NULL;
735 }
f1126e95
FT		 736 return ret;
737}
738
5db44863
MP		 739static void sd_config_write_same(struct scsi_disk *sdkp)
740{
741 struct request_queue *q = sdkp->disk->queue;
742 unsigned int logical_block_size = sdkp->device->sector_size;
743 unsigned int blocks = 0;
744
745 if (sdkp->device->no_write_same) {
746 sdkp->max_ws_blocks = 0;
747 goto out;
748 }
749
750 /* Some devices can not handle block counts above 0xffff despite
751 * supporting WRITE SAME(16). Consequently we default to 64k
752 * blocks per I/O unless the device explicitly advertises a
753 * bigger limit.
754 */
755 if (sdkp->max_ws_blocks == 0)
756 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
757
758 if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
759 blocks = min_not_zero(sdkp->max_ws_blocks,
760 (u32)SD_MAX_WS16_BLOCKS);
761 else
762 blocks = min_not_zero(sdkp->max_ws_blocks,
763 (u32)SD_MAX_WS10_BLOCKS);
764
765out:
766 blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
767}
768
769/**
770 * sd_setup_write_same_cmnd - write the same data to multiple blocks
771 * @sdp: scsi device to operate one
772 * @rq: Request to prepare
773 *
774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
775 * preference indicated by target device.
776 **/
777static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
778{
779 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
780 struct bio *bio = rq->bio;
781 sector_t sector = blk_rq_pos(rq);
782 unsigned int nr_sectors = blk_rq_sectors(rq);
783 unsigned int nr_bytes = blk_rq_bytes(rq);
784 int ret;
785
786 if (sdkp->device->no_write_same)
787 return BLKPREP_KILL;
788
789 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
790
791 sector >>= ilog2(sdp->sector_size) - 9;
792 nr_sectors >>= ilog2(sdp->sector_size) - 9;
793
794 rq->__data_len = sdp->sector_size;
795 rq->timeout = SD_WRITE_SAME_TIMEOUT;
796 memset(rq->cmd, 0, rq->cmd_len);
797
798 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
799 rq->cmd_len = 16;
800 rq->cmd[0] = WRITE_SAME_16;
801 put_unaligned_be64(sector, &rq->cmd[2]);
802 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
803 } else {
804 rq->cmd_len = 10;
805 rq->cmd[0] = WRITE_SAME;
806 put_unaligned_be32(sector, &rq->cmd[2]);
807 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
808 }
809
810 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
811 rq->__data_len = nr_bytes;
812
813 return ret;
814}
815
90467c29
FT		 816static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
817{
e3b3e624 818 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 819 rq->retries = SD_MAX_RETRIES;
820 rq->cmd[0] = SYNCHRONIZE_CACHE;
821 rq->cmd_len = 10;
822
823 return scsi_setup_blk_pc_cmnd(sdp, rq);
824}
825
f1126e95
FT		 826static void sd_unprep_fn(struct request_queue *q, struct request *rq)
827{
610a6349
FT		 828 if (rq->cmd_flags & REQ_DISCARD) {
829 free_page((unsigned long)rq->buffer);
830 rq->buffer = NULL;
831 }
e339c1a7
MP		 832}
833
1da177e4 834/**
2db93ce8 835 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 836 * information in the request structure.
837 * @SCpnt: pointer to mid-level's per scsi command structure that
838 * contains request and into which the scsi command is written
839 *
840 * Returns 1 if successful and 0 if error (or cannot be done now).
841 **/
7f9a6bc4 842static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 843{
7f9a6bc4
JB		 844 struct scsi_cmnd *SCpnt;
845 struct scsi_device *sdp = q->queuedata;
776b23a0 846 struct gendisk *disk = rq->rq_disk;
af55ff67 847 struct scsi_disk *sdkp;
83096ebf 848 sector_t block = blk_rq_pos(rq);
18351070 849 sector_t threshold;
83096ebf 850 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 851 int ret, host_dif;
4e7392ec 852 unsigned char protect;
7f9a6bc4 853
e339c1a7
MP		 854 /*
855 * Discard request come in as REQ_TYPE_FS but we turn them into
856 * block PC requests to make life easier.
857 */
66ac0280 858 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 859 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 860 goto out;
5db44863
MP		 861 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
862 ret = sd_setup_write_same_cmnd(sdp, rq);
863 goto out;
90467c29
FT		 864 } else if (rq->cmd_flags & REQ_FLUSH) {
865 ret = scsi_setup_flush_cmnd(sdp, rq);
866 goto out;
66ac0280 867 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 868 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
869 goto out;
870 } else if (rq->cmd_type != REQ_TYPE_FS) {
871 ret = BLKPREP_KILL;
872 goto out;
873 }
874 ret = scsi_setup_fs_cmnd(sdp, rq);
875 if (ret != BLKPREP_OK)
876 goto out;
877 SCpnt = rq->special;
af55ff67 878 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 879
880 /* from here on until we're complete, any goto out
881 * is used for a killable error condition */
882 ret = BLKPREP_KILL;
1da177e4 883
fa0d34be 884 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 885 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 886 "count=%d\n",
887 (unsigned long long)block,
888 this_count));
1da177e4
LT		 889
890 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 891 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 892 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 893 "Finishing %u sectors\n",
894 blk_rq_sectors(rq)));
fa0d34be
MP		 895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
896 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 897 goto out;
1da177e4
LT		 898 }
899
900 if (sdp->changed) {
901 /*
902 * quietly refuse to do anything to a changed disc until
903 * the changed bit has been reset
904 */
3ff5588d 905 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 906 goto out;
1da177e4 907 }
7f9a6bc4 908
a0899d4d 909 /*
18351070
LT		 910 * Some SD card readers can't handle multi-sector accesses which touch
911 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 912 */
18351070
LT		 913 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
914 (sdp->sector_size / 512);
915
916 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
917 if (block < threshold) {
918 /* Access up to the threshold but not beyond */
919 this_count = threshold - block;
920 } else {
921 /* Access only a single hardware sector */
922 this_count = sdp->sector_size / 512;
923 }
924 }
a0899d4d 925
fa0d34be
MP		 926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
927 (unsigned long long)block));
1da177e4
LT		 928
929 /*
930 * If we have a 1K hardware sectorsize, prevent access to single
931 * 512 byte sectors. In theory we could handle this - in fact
932 * the scsi cdrom driver must be able to handle this because
933 * we typically use 1K blocksizes, and cdroms typically have
934 * 2K hardware sectorsizes. Of course, things are simpler
935 * with the cdrom, since it is read-only. For performance
936 * reasons, the filesystems should be able to handle this
937 * and not force the scsi disk driver to use bounce buffers
938 * for this.
939 */
940 if (sdp->sector_size == 1024) {
83096ebf 941 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 942 scmd_printk(KERN_ERR, SCpnt,
943 "Bad block number requested\n");
7f9a6bc4 944 goto out;
1da177e4
LT		 945 } else {
946 block = block >> 1;
947 this_count = this_count >> 1;
948 }
949 }
950 if (sdp->sector_size == 2048) {
83096ebf 951 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
7f9a6bc4 954 goto out;
1da177e4
LT		 955 } else {
956 block = block >> 2;
957 this_count = this_count >> 2;
958 }
959 }
960 if (sdp->sector_size == 4096) {
83096ebf 961 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
7f9a6bc4 964 goto out;
1da177e4
LT		 965 } else {
966 block = block >> 3;
967 this_count = this_count >> 3;
968 }
969 }
970 if (rq_data_dir(rq) == WRITE) {
971 if (!sdp->writeable) {
7f9a6bc4 972 goto out;
1da177e4
LT		 973 }
974 SCpnt->cmnd[0] = WRITE_6;
975 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 976
8c579ab6
MP		 977 if (blk_integrity_rq(rq))
978 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 979
1da177e4
LT		 980 } else if (rq_data_dir(rq) == READ) {
981 SCpnt->cmnd[0] = READ_6;
982 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
983 } else {
e73aec82 984 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 985 goto out;
1da177e4
LT		 986 }
987
fa0d34be 988 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 989 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 990 (rq_data_dir(rq) == WRITE) ?
991 "writing" : "reading", this_count,
83096ebf 992 blk_rq_sectors(rq)));
1da177e4 993
af55ff67 994 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 995 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
996 if (host_dif)
4e7392ec 997 protect = 1 << 5;
af55ff67 998 else
4e7392ec
MP		 999 protect = 0;
1000
1001 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1002 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1003
1004 if (unlikely(SCpnt->cmnd == NULL)) {
1005 ret = BLKPREP_DEFER;
1006 goto out;
1007 }
af55ff67 1008
4e7392ec
MP		 1009 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1010 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1011 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1012 SCpnt->cmnd[7] = 0x18;
1013 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1014 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1015
1016 /* LBA */
1017 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1022 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1023 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1024 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1025
1026 /* Expected Indirect LBA */
1027 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1028 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1029 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1030 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1031
1032 /* Transfer length */
1033 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1034 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1035 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1036 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
53ad570b 1037 } else if (sdp->use_16_for_rw) {
1da177e4 1038 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1039 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1040 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1041 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1042 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1043 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1044 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1045 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1046 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1047 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1048 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1049 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1050 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1051 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1052 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1053 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1054 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 1055 SCpnt->device->use_10_for_rw) {
1056 if (this_count > 0xffff)
1057 this_count = 0xffff;
1058
1059 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1061 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1062 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1063 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1064 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1065 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1066 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1067 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1068 } else {
33659ebb 1069 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1070 /*
1071 * This happens only if this drive failed
1072 * 10byte rw command with ILLEGAL_REQUEST
1073 * during operation and thus turned off
1074 * use_10_for_rw.
1075 */
e73aec82
MP		 1076 scmd_printk(KERN_ERR, SCpnt,
1077 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1078 goto out;
007365ad
TH		 1079 }
1080
1da177e4
LT		 1081 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1082 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1083 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1084 SCpnt->cmnd[4] = (unsigned char) this_count;
1085 SCpnt->cmnd[5] = 0;
1086 }
30b0c37b 1087 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1088
af55ff67 1089 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1090 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1091 sd_prot_op(SCpnt, host_dif);
af55ff67 1092
1da177e4
LT		 1093 /*
1094 * We shouldn't disconnect in the middle of a sector, so with a dumb
1095 * host adapter, it's safe to assume that we can at least transfer
1096 * this many bytes between each connect / disconnect.
1097 */
1098 SCpnt->transfersize = sdp->sector_size;
1099 SCpnt->underflow = this_count << 9;
1100 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1101
1da177e4
LT		 1102 /*
1103 * This indicates that the command is ready from our end to be
1104 * queued.
1105 */
7f9a6bc4
JB		 1106 ret = BLKPREP_OK;
1107 out:
1108 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 1109}
1110
1111/**
1112 * sd_open - open a scsi disk device
1113 * @inode: only i_rdev member may be used
1114 * @filp: only f_mode and f_flags may be used
1115 *
1116 * Returns 0 if successful. Returns a negated errno value in case
1117 * of error.
1118 *
1119 * Note: This can be called from a user context (e.g. fsck(1) )
1120 * or from within the kernel (e.g. as a result of a mount(1) ).
1121 * In the latter case @inode and @filp carry an abridged amount
1122 * of information as noted above.
409f3499
AB		 1123 *
1124 * Locking: called with bdev->bd_mutex held.
1da177e4 1125 **/
0338e291 1126static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1127{
0338e291 1128 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1129 struct scsi_device *sdev;
1130 int retval;
1131
0338e291 1132 if (!sdkp)
1da177e4
LT		 1133 return -ENXIO;
1134
fa0d34be 1135 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1136
1137 sdev = sdkp->device;
1138
1139 /*
1140 * If the device is in error recovery, wait until it is done.
1141 * If the device is offline, then disallow any access to it.
1142 */
1143 retval = -ENXIO;
1144 if (!scsi_block_when_processing_errors(sdev))
1145 goto error_out;
1146
1147 if (sdev->removable || sdkp->write_prot)
0338e291 1148 check_disk_change(bdev);
1da177e4
LT		 1149
1150 /*
1151 * If the drive is empty, just let the open fail.
1152 */
1153 retval = -ENOMEDIUM;
0338e291 1154 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1155 goto error_out;
1156
1157 /*
1158 * If the device has the write protect tab set, have the open fail
1159 * if the user expects to be able to write to the thing.
1160 */
1161 retval = -EROFS;
0338e291 1162 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1163 goto error_out;
1164
1165 /*
1166 * It is possible that the disk changing stuff resulted in
1167 * the device being taken offline. If this is the case,
1168 * report this to the user, and don't pretend that the
1169 * open actually succeeded.
1170 */
1171 retval = -ENXIO;
1172 if (!scsi_device_online(sdev))
1173 goto error_out;
1174
409f3499 1175 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1176 if (scsi_block_when_processing_errors(sdev))
1177 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1178 }
1179
1180 return 0;
1181
1182error_out:
1183 scsi_disk_put(sdkp);
1184 return retval;
1185}
1186
1187/**
1188 * sd_release - invoked when the (last) close(2) is called on this
1189 * scsi disk.
1190 * @inode: only i_rdev member may be used
1191 * @filp: only f_mode and f_flags may be used
1192 *
1193 * Returns 0.
1194 *
1195 * Note: may block (uninterruptible) if error recovery is underway
1196 * on this disk.
409f3499
AB		 1197 *
1198 * Locking: called with bdev->bd_mutex held.
1da177e4 1199 **/
db2a144b 1200static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1201{
1da177e4
LT		 1202 struct scsi_disk *sdkp = scsi_disk(disk);
1203 struct scsi_device *sdev = sdkp->device;
1204
56937f7b 1205 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1206
7e443312 1207 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1208 if (scsi_block_when_processing_errors(sdev))
1209 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1210 }
1211
1212 /*
1213 * XXX and what if there are packets in flight and this close()
1214 * XXX is followed by a "rmmod sd_mod"?
1215 */
478a8a05 1216
1da177e4 1217 scsi_disk_put(sdkp);
1da177e4
LT		 1218}
1219
a885c8c4 1220static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1221{
1222 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1223 struct scsi_device *sdp = sdkp->device;
1224 struct Scsi_Host *host = sdp->host;
1225 int diskinfo[4];
1226
1227 /* default to most commonly used values */
1228 diskinfo[0] = 0x40; /* 1 << 6 */
1229 diskinfo[1] = 0x20; /* 1 << 5 */
1230 diskinfo[2] = sdkp->capacity >> 11;
1231
1232 /* override with calculated, extended default, or driver values */
1233 if (host->hostt->bios_param)
1234 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1235 else
1236 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1237
a885c8c4
CH		 1238 geo->heads = diskinfo[0];
1239 geo->sectors = diskinfo[1];
1240 geo->cylinders = diskinfo[2];
1da177e4
LT		 1241 return 0;
1242}
1243
1244/**
1245 * sd_ioctl - process an ioctl
1246 * @inode: only i_rdev/i_bdev members may be used
1247 * @filp: only f_mode and f_flags may be used
1248 * @cmd: ioctl command number
1249 * @arg: this is third argument given to ioctl(2) system call.
1250 * Often contains a pointer.
1251 *
25985edc 1252 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1253 * success as well). Returns a negated errno value in case of error.
1254 *
1255 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1256 * down in the scsi subsystem.
1da177e4 1257 **/
0338e291 1258static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1259 unsigned int cmd, unsigned long arg)
1260{
1da177e4 1261 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1262 struct scsi_disk *sdkp = scsi_disk(disk);
1263 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1264 void __user *p = (void __user *)arg;
1265 int error;
1266
fe2d1851
NN		 1267 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1268 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1269
0bfc96cb
PB		 1270 error = scsi_verify_blk_ioctl(bdev, cmd);
1271 if (error < 0)
1272 return error;
1273
1da177e4
LT		 1274 /*
1275 * If we are in the middle of error recovery, don't let anyone
1276 * else try and use this device. Also, if error recovery fails, it
1277 * may try and take the device offline, in which case all further
1278 * access to the device is prohibited.
1279 */
83ff6fe8 1280 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1281 (mode & FMODE_NDELAY) != 0);
1da177e4 1282 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1283 goto out;
1da177e4 1284
1da177e4
LT		 1285 /*
1286 * Send SCSI addressing ioctls directly to mid level, send other
1287 * ioctls to block level and then onto mid level if they can't be
1288 * resolved.
1289 */
1290 switch (cmd) {
1291 case SCSI_IOCTL_GET_IDLUN:
1292 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1293 error = scsi_ioctl(sdp, cmd, p);
1294 break;
1da177e4 1295 default:
577ebb37 1296 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1297 if (error != -ENOTTY)
8a6cfeb6
AB		 1298 break;
1299 error = scsi_ioctl(sdp, cmd, p);
1300 break;
1da177e4 1301 }
8a6cfeb6 1302out:
8a6cfeb6 1303 return error;
1da177e4
LT		 1304}
1305
1306static void set_media_not_present(struct scsi_disk *sdkp)
1307{
2bae0093
TH		 1308 if (sdkp->media_present)
1309 sdkp->device->changed = 1;
1310
1311 if (sdkp->device->removable) {
1312 sdkp->media_present = 0;
1313 sdkp->capacity = 0;
1314 }
1315}
1316
1317static int media_not_present(struct scsi_disk *sdkp,
1318 struct scsi_sense_hdr *sshdr)
1319{
1320 if (!scsi_sense_valid(sshdr))
1321 return 0;
1322
1323 /* not invoked for commands that could return deferred errors */
1324 switch (sshdr->sense_key) {
1325 case UNIT_ATTENTION:
1326 case NOT_READY:
1327 /* medium not present */
1328 if (sshdr->asc == 0x3A) {
1329 set_media_not_present(sdkp);
1330 return 1;
1331 }
1332 }
1333 return 0;
1da177e4
LT		 1334}
1335
1336/**
2bae0093
TH		 1337 * sd_check_events - check media events
1338 * @disk: kernel device descriptor
1339 * @clearing: disk events currently being cleared
1da177e4 1340 *
2bae0093 1341 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1342 *
1343 * Note: this function is invoked from the block subsystem.
1344 **/
2bae0093 1345static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1346{
1347 struct scsi_disk *sdkp = scsi_disk(disk);
1348 struct scsi_device *sdp = sdkp->device;
001aac25 1349 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1350 int retval;
1351
2bae0093 1352 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1353
1354 /*
1355 * If the device is offline, don't send any commands - just pretend as
1356 * if the command failed. If the device ever comes back online, we
1357 * can deal with it then. It is only because of unrecoverable errors
1358 * that we would ever take a device offline in the first place.
1359 */
285e9670
KS		 1360 if (!scsi_device_online(sdp)) {
1361 set_media_not_present(sdkp);
285e9670
KS		 1362 goto out;
1363 }
1da177e4
LT		 1364
1365 /*
1366 * Using TEST_UNIT_READY enables differentiation between drive with
1367 * no cartridge loaded - NOT READY, drive with changed cartridge -
1368 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1369 *
1370 * Drives that auto spin down. eg iomega jaz 1G, will be started
1371 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1372 * sd_revalidate() is called.
1373 */
1374 retval = -ENODEV;
285e9670 1375
001aac25
JB		 1376 if (scsi_block_when_processing_errors(sdp)) {
1377 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1378 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1379 sshdr);
1380 }
1da177e4 1381
2bae0093
TH		 1382 /* failed to execute TUR, assume media not present */
1383 if (host_byte(retval)) {
285e9670 1384 set_media_not_present(sdkp);
285e9670
KS		 1385 goto out;
1386 }
1da177e4 1387
2bae0093
TH		 1388 if (media_not_present(sdkp, sshdr))
1389 goto out;
1390
1da177e4
LT		 1391 /*
1392 * For removable scsi disk we have to recognise the presence
2bae0093 1393 * of a disk in the drive.
1da177e4 1394 */
2bae0093
TH		 1395 if (!sdkp->media_present)
1396 sdp->changed = 1;
1da177e4 1397 sdkp->media_present = 1;
285e9670 1398out:
3ff5588d 1399 /*
2bae0093 1400 * sdp->changed is set under the following conditions:
3ff5588d 1401 *
2bae0093
TH		 1402 * Medium present state has changed in either direction.
1403 * Device has indicated UNIT_ATTENTION.
3ff5588d 1404 */
001aac25 1405 kfree(sshdr);
2bae0093
TH		 1406 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1407 sdp->changed = 0;
1da177e4 1408 return retval;
1da177e4
LT		 1409}
1410
e73aec82 1411static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1412{
1da177e4 1413 int retries, res;
e73aec82 1414 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1415 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1416
1417 if (!scsi_device_online(sdp))
1418 return -ENODEV;
1419
1da177e4 1420
1da177e4
LT		 1421 for (retries = 3; retries > 0; --retries) {
1422 unsigned char cmd[10] = { 0 };
1423
1424 cmd[0] = SYNCHRONIZE_CACHE;
1425 /*
1426 * Leave the rest of the command zero to indicate
1427 * flush everything.
1428 */
9b21493c
LM		 1429 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1430 &sshdr, SD_FLUSH_TIMEOUT,
1431 SD_MAX_RETRIES, NULL, REQ_PM);
ea73a9f2 1432 if (res == 0)
1da177e4
LT		 1433 break;
1434 }
1435
e73aec82
MP		 1436 if (res) {
1437 sd_print_result(sdkp, res);
1438 if (driver_byte(res) & DRIVER_SENSE)
1439 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1440 }
1441
3721050a
TH		 1442 if (res)
1443 return -EIO;
1444 return 0;
1da177e4
LT		 1445}
1446
1da177e4
LT		 1447static void sd_rescan(struct device *dev)
1448{
39b7f1e2
AS		 1449 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1450
1451 if (sdkp) {
f98a8cae 1452 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1453 scsi_disk_put(sdkp);
1454 }
1da177e4
LT		 1455}
1456
1457
1458#ifdef CONFIG_COMPAT
1459/*
1460 * This gets directly called from VFS. When the ioctl
1461 * is not recognized we go back to the other translation paths.
1462 */
0338e291
AV		 1463static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1464 unsigned int cmd, unsigned long arg)
1da177e4 1465{
0338e291 1466 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1467 int ret;
1468
1469 ret = scsi_verify_blk_ioctl(bdev, cmd);
1470 if (ret < 0)
1471 return ret;
1da177e4
LT		 1472
1473 /*
1474 * If we are in the middle of error recovery, don't let anyone
1475 * else try and use this device. Also, if error recovery fails, it
1476 * may try and take the device offline, in which case all further
1477 * access to the device is prohibited.
1478 */
1479 if (!scsi_block_when_processing_errors(sdev))
1480 return -ENODEV;
1481
1482 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1483 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1484
1485 return ret;
1486 }
1487
1488 /*
1489 * Let the static ioctl translation table take care of it.
1490 */
1491 return -ENOIOCTLCMD;
1492}
1493#endif
1494
83d5cde4 1495static const struct block_device_operations sd_fops = {
1da177e4 1496 .owner = THIS_MODULE,
0338e291
AV		 1497 .open = sd_open,
1498 .release = sd_release,
8a6cfeb6 1499 .ioctl = sd_ioctl,
a885c8c4 1500 .getgeo = sd_getgeo,
1da177e4 1501#ifdef CONFIG_COMPAT
0338e291 1502 .compat_ioctl = sd_compat_ioctl,
1da177e4 1503#endif
2bae0093 1504 .check_events = sd_check_events,
1da177e4 1505 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1506 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1507};
1508
18a4d0a2
MP		 1509/**
1510 * sd_eh_action - error handling callback
1511 * @scmd: sd-issued command that has failed
1512 * @eh_cmnd: The command that was sent during error handling
1513 * @eh_cmnd_len: Length of eh_cmnd in bytes
1514 * @eh_disp: The recovery disposition suggested by the midlayer
1515 *
1516 * This function is called by the SCSI midlayer upon completion of
1517 * an error handling command (TEST UNIT READY, START STOP UNIT,
1518 * etc.) The command sent to the device by the error handler is
1519 * stored in eh_cmnd. The result of sending the eh command is
1520 * passed in eh_disp.
1521 **/
1522static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1523 int eh_cmnd_len, int eh_disp)
1524{
1525 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1526
1527 if (!scsi_device_online(scmd->device) ||
1528 !scsi_medium_access_command(scmd))
1529 return eh_disp;
1530
1531 /*
1532 * The device has timed out executing a medium access command.
1533 * However, the TEST UNIT READY command sent during error
1534 * handling completed successfully. Either the device is in the
1535 * process of recovering or has it suffered an internal failure
1536 * that prevents access to the storage medium.
1537 */
1538 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1539 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1540 sdkp->medium_access_timed_out++;
1541
1542 /*
1543 * If the device keeps failing read/write commands but TEST UNIT
1544 * READY always completes successfully we assume that medium
1545 * access is no longer possible and take the device offline.
1546 */
1547 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1548 scmd_printk(KERN_ERR, scmd,
1549 "Medium access timeout failure. Offlining disk!\n");
1550 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1551
1552 return FAILED;
1553 }
1554
1555 return eh_disp;
1556}
1557
af55ff67
MP		 1558static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1559{
83096ebf
TH		 1560 u64 start_lba = blk_rq_pos(scmd->request);
1561 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1562 u64 bad_lba;
1563 int info_valid;
a8733c7b
JB		 1564 /*
1565 * resid is optional but mostly filled in. When it's unused,
1566 * its value is zero, so we assume the whole buffer transferred
1567 */
1568 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1569 unsigned int good_bytes;
af55ff67 1570
33659ebb 1571 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1572 return 0;
1573
1574 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1575 SCSI_SENSE_BUFFERSIZE,
1576 &bad_lba);
1577 if (!info_valid)
1578 return 0;
1579
1580 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1581 return 0;
1582
1583 if (scmd->device->sector_size < 512) {
1584 /* only legitimate sector_size here is 256 */
1585 start_lba <<= 1;
1586 end_lba <<= 1;
1587 } else {
1588 /* be careful ... don't want any overflows */
1589 u64 factor = scmd->device->sector_size / 512;
1590 do_div(start_lba, factor);
1591 do_div(end_lba, factor);
1592 }
1593
1594 /* The bad lba was reported incorrectly, we have no idea where
1595 * the error is.
1596 */
1597 if (bad_lba < start_lba || bad_lba >= end_lba)
1598 return 0;
1599
1600 /* This computation should always be done in terms of
1601 * the resolution of the device's medium.
1602 */
a8733c7b
JB		 1603 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1604 return min(good_bytes, transferred);
af55ff67
MP		 1605}
1606
1da177e4 1607/**
7b3d9545 1608 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1609 * driver has completed (successfully or otherwise) a scsi command.
1610 * @SCpnt: mid-level's per command structure.
1611 *
1612 * Note: potentially run from within an ISR. Must not block.
1613 **/
7b3d9545 1614static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1615{
1616 int result = SCpnt->result;
af55ff67 1617 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1618 struct scsi_sense_hdr sshdr;
4e7392ec 1619 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1620 struct request *req = SCpnt->request;
1da177e4
LT		 1621 int sense_valid = 0;
1622 int sense_deferred = 0;
c98a0eb0 1623 unsigned char op = SCpnt->cmnd[0];
5db44863 1624 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1625
5db44863 1626 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1627 if (!result) {
1628 good_bytes = blk_rq_bytes(req);
1629 scsi_set_resid(SCpnt, 0);
1630 } else {
1631 good_bytes = 0;
1632 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1633 }
1634 }
6a32a8ae 1635
1da177e4
LT		 1636 if (result) {
1637 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1638 if (sense_valid)
1639 sense_deferred = scsi_sense_is_deferred(&sshdr);
1640 }
1da177e4 1641#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1642 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1643 if (sense_valid) {
fa0d34be 1644 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1645 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1646 "ascq]=%x,%x,%x,%x\n",
1647 sshdr.response_code,
1648 sshdr.sense_key, sshdr.asc,
1649 sshdr.ascq));
1da177e4
LT		 1650 }
1651#endif
03aba2f7
LT		 1652 if (driver_byte(result) != DRIVER_SENSE &&
1653 (!sense_valid || sense_deferred))
1654 goto out;
1655
18a4d0a2
MP		 1656 sdkp->medium_access_timed_out = 0;
1657
03aba2f7
LT		 1658 switch (sshdr.sense_key) {
1659 case HARDWARE_ERROR:
1660 case MEDIUM_ERROR:
af55ff67 1661 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1662 break;
1663 case RECOVERED_ERROR:
af55ff67
MP		 1664 good_bytes = scsi_bufflen(SCpnt);
1665 break;
10dab226
JW		 1666 case NO_SENSE:
1667 /* This indicates a false check condition, so ignore it. An
1668 * unknown amount of data was transferred so treat it as an
1669 * error.
1670 */
1671 scsi_print_sense("sd", SCpnt);
1672 SCpnt->result = 0;
1673 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1674 break;
c98a0eb0
MP		 1675 case ABORTED_COMMAND:
1676 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1677 good_bytes = sd_completed_bytes(SCpnt);
1678 break;
1679 case ILLEGAL_REQUEST:
1680 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1681 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1682 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1683 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1684 switch (op) {
1685 case UNMAP:
1686 sd_config_discard(sdkp, SD_LBP_DISABLE);
1687 break;
1688 case WRITE_SAME_16:
1689 case WRITE_SAME:
1690 if (unmap)
1691 sd_config_discard(sdkp, SD_LBP_DISABLE);
1692 else {
1693 sdkp->device->no_write_same = 1;
1694 sd_config_write_same(sdkp);
1695
1696 good_bytes = 0;
1697 req->__data_len = blk_rq_bytes(req);
1698 req->cmd_flags |= REQ_QUIET;
1699 }
1700 }
1701 }
03aba2f7
LT		 1702 break;
1703 default:
1704 break;
1da177e4 1705 }
03aba2f7 1706 out:
af55ff67
MP		 1707 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1708 sd_dif_complete(SCpnt, good_bytes);
1709
4e7392ec 1710 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1711 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1712
1713 /* We have to print a failed command here as the
1714 * extended CDB gets freed before scsi_io_completion()
1715 * is called.
1716 */
1717 if (result)
1718 scsi_print_command(SCpnt);
1719
4e7392ec 1720 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1721 SCpnt->cmnd = NULL;
1722 SCpnt->cmd_len = 0;
1723 }
4e7392ec 1724
7b3d9545 1725 return good_bytes;
1da177e4
LT		 1726}
1727
1da177e4
LT		 1728/*
1729 * spinup disk - called only in sd_revalidate_disk()
1730 */
1731static void
e73aec82 1732sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1733{
1da177e4 1734 unsigned char cmd[10];
4451e472 1735 unsigned long spintime_expire = 0;
1da177e4
LT		 1736 int retries, spintime;
1737 unsigned int the_result;
1738 struct scsi_sense_hdr sshdr;
1739 int sense_valid = 0;
1740
1741 spintime = 0;
1742
1743 /* Spin up drives, as required. Only do this at boot time */
1744 /* Spinup needs to be done for module loads too. */
1745 do {
1746 retries = 0;
1747
1748 do {
1749 cmd[0] = TEST_UNIT_READY;
1750 memset((void *) &cmd[1], 0, 9);
1751
ea73a9f2
JB		 1752 the_result = scsi_execute_req(sdkp->device, cmd,
1753 DMA_NONE, NULL, 0,
1754 &sshdr, SD_TIMEOUT,
f4f4e47e 1755 SD_MAX_RETRIES, NULL);
1da177e4 1756
b4d38e38
AS		 1757 /*
1758 * If the drive has indicated to us that it
1759 * doesn't have any media in it, don't bother
1760 * with any more polling.
1761 */
1762 if (media_not_present(sdkp, &sshdr))
1763 return;
1764
1da177e4 1765 if (the_result)
ea73a9f2 1766 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1767 retries++;
1768 } while (retries < 3 &&
1769 (!scsi_status_is_good(the_result) ||
1770 ((driver_byte(the_result) & DRIVER_SENSE) &&
1771 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1772
1da177e4
LT		 1773 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1774 /* no sense, TUR either succeeded or failed
1775 * with a status error */
e73aec82
MP		 1776 if(!spintime && !scsi_status_is_good(the_result)) {
1777 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1778 sd_print_result(sdkp, the_result);
1779 }
1da177e4
LT		 1780 break;
1781 }
1782
1783 /*
1784 * The device does not want the automatic start to be issued.
1785 */
33dd6f92 1786 if (sdkp->device->no_start_on_add)
1da177e4 1787 break;
1da177e4 1788
33dd6f92
MW		 1789 if (sense_valid && sshdr.sense_key == NOT_READY) {
1790 if (sshdr.asc == 4 && sshdr.ascq == 3)
1791 break; /* manual intervention required */
1792 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1793 break; /* standby */
1794 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1795 break; /* unavailable */
1796 /*
1797 * Issue command to spin up drive when not ready
1798 */
1da177e4 1799 if (!spintime) {
e73aec82 1800 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1801 cmd[0] = START_STOP;
1802 cmd[1] = 1; /* Return immediately */
1803 memset((void *) &cmd[2], 0, 8);
1804 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1805 if (sdkp->device->start_stop_pwr_cond)
1806 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1807 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1808 NULL, 0, &sshdr,
f4f4e47e
FT		 1809 SD_TIMEOUT, SD_MAX_RETRIES,
1810 NULL);
4451e472
AS		 1811 spintime_expire = jiffies + 100 * HZ;
1812 spintime = 1;
1da177e4 1813 }
1da177e4
LT		 1814 /* Wait 1 second for next try */
1815 msleep(1000);
1816 printk(".");
4451e472
AS		 1817
1818 /*
1819 * Wait for USB flash devices with slow firmware.
1820 * Yes, this sense key/ASC combination shouldn't
1821 * occur here. It's characteristic of these devices.
1822 */
1823 } else if (sense_valid &&
1824 sshdr.sense_key == UNIT_ATTENTION &&
1825 sshdr.asc == 0x28) {
1826 if (!spintime) {
1827 spintime_expire = jiffies + 5 * HZ;
1828 spintime = 1;
1829 }
1830 /* Wait 1 second for next try */
1831 msleep(1000);
1da177e4
LT		 1832 } else {
1833 /* we don't understand the sense code, so it's
1834 * probably pointless to loop */
1835 if(!spintime) {
e73aec82
MP		 1836 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1837 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1838 }
1839 break;
1840 }
1841
4451e472 1842 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1843
1844 if (spintime) {
1845 if (scsi_status_is_good(the_result))
1846 printk("ready\n");
1847 else
1848 printk("not responding...\n");
1849 }
1850}
1851
e0597d70
MP		 1852
1853/*
1854 * Determine whether disk supports Data Integrity Field.
1855 */
fe542396 1856static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1857{
1858 struct scsi_device *sdp = sdkp->device;
1859 u8 type;
fe542396 1860 int ret = 0;
e0597d70
MP		 1861
1862 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1863 return ret;
35e1a5d9
MP		 1864
1865 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1866
fe542396
MP		 1867 if (type > SD_DIF_TYPE3_PROTECTION)
1868 ret = -ENODEV;
1869 else if (scsi_host_dif_capable(sdp->host, type))
1870 ret = 1;
1871
1872 if (sdkp->first_scan || type != sdkp->protection_type)
1873 switch (ret) {
1874 case -ENODEV:
1875 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1876 " protection type %u. Disabling disk!\n",
1877 type);
1878 break;
1879 case 1:
1880 sd_printk(KERN_NOTICE, sdkp,
1881 "Enabling DIF Type %u protection\n", type);
1882 break;
1883 case 0:
1884 sd_printk(KERN_NOTICE, sdkp,
1885 "Disabling DIF Type %u protection\n", type);
1886 break;
1887 }
e0597d70 1888
be922f47
MP		 1889 sdkp->protection_type = type;
1890
fe542396 1891 return ret;
e0597d70
MP		 1892}
1893
0da205e0
MW		 1894static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1895 struct scsi_sense_hdr *sshdr, int sense_valid,
1896 int the_result)
1897{
1898 sd_print_result(sdkp, the_result);
1899 if (driver_byte(the_result) & DRIVER_SENSE)
1900 sd_print_sense_hdr(sdkp, sshdr);
1901 else
1902 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1903
1904 /*
1905 * Set dirty bit for removable devices if not ready -
1906 * sometimes drives will not report this properly.
1907 */
1908 if (sdp->removable &&
1909 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1910 set_media_not_present(sdkp);
0da205e0
MW		 1911
1912 /*
1913 * We used to set media_present to 0 here to indicate no media
1914 * in the drive, but some drives fail read capacity even with
1915 * media present, so we can't do that.
1916 */
1917 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1918}
1919
1920#define RC16_LEN 32
1921#if RC16_LEN > SD_BUF_SIZE
1922#error RC16_LEN must not be more than SD_BUF_SIZE
1923#endif
1924
3233ac19
JB		 1925#define READ_CAPACITY_RETRIES_ON_RESET 10
1926
0da205e0
MW		 1927static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1928 unsigned char *buffer)
ea73a9f2 1929{
1da177e4 1930 unsigned char cmd[16];
1da177e4
LT		 1931 struct scsi_sense_hdr sshdr;
1932 int sense_valid = 0;
0da205e0 1933 int the_result;
3233ac19 1934 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1935 unsigned int alignment;
0da205e0
MW		 1936 unsigned long long lba;
1937 unsigned sector_size;
1da177e4 1938
5ce524bd
HG		 1939 if (sdp->no_read_capacity_16)
1940 return -EINVAL;
1941
1da177e4 1942 do {
0da205e0
MW		 1943 memset(cmd, 0, 16);
1944 cmd[0] = SERVICE_ACTION_IN;
1945 cmd[1] = SAI_READ_CAPACITY_16;
1946 cmd[13] = RC16_LEN;
1947 memset(buffer, 0, RC16_LEN);
1948
ea73a9f2 1949 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1950 buffer, RC16_LEN, &sshdr,
1951 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1952
ea73a9f2 1953 if (media_not_present(sdkp, &sshdr))
0da205e0 1954 return -ENODEV;
1da177e4 1955
2b301307 1956 if (the_result) {
ea73a9f2 1957 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1958 if (sense_valid &&
1959 sshdr.sense_key == ILLEGAL_REQUEST &&
1960 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1961 sshdr.ascq == 0x00)
1962 /* Invalid Command Operation Code or
1963 * Invalid Field in CDB, just retry
1964 * silently with RC10 */
1965 return -EINVAL;
3233ac19
JB		 1966 if (sense_valid &&
1967 sshdr.sense_key == UNIT_ATTENTION &&
1968 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1969 /* Device reset might occur several times,
1970 * give it one more chance */
1971 if (--reset_retries > 0)
1972 continue;
2b301307 1973 }
1da177e4
LT		 1974 retries--;
1975
1976 } while (the_result && retries);
1977
0da205e0 1978 if (the_result) {
e73aec82 1979 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1980 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1981 return -EINVAL;
1982 }
e73aec82 1983
8f76d151
DH		 1984 sector_size = get_unaligned_be32(&buffer[8]);
1985 lba = get_unaligned_be64(&buffer[0]);
0da205e0 1986
fe542396
MP		 1987 if (sd_read_protection_type(sdkp, buffer) < 0) {
1988 sdkp->capacity = 0;
1989 return -ENODEV;
1990 }
0da205e0
MW		 1991
1992 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1993 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1994 "kernel compiled with support for large block "
1995 "devices.\n");
1996 sdkp->capacity = 0;
1997 return -EOVERFLOW;
1998 }
1999
ea09bcc9 2000 /* Logical blocks per physical block exponent */
526f7c79 2001 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2002
2003 /* Lowest aligned logical block */
2004 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2005 blk_queue_alignment_offset(sdp->request_queue, alignment);
2006 if (alignment && sdkp->first_scan)
2007 sd_printk(KERN_NOTICE, sdkp,
2008 "physical block alignment offset: %u\n", alignment);
2009
c98a0eb0
MP		 2010 if (buffer[14] & 0x80) { /* LBPME */
2011 sdkp->lbpme = 1;
e339c1a7 2012
c98a0eb0
MP		 2013 if (buffer[14] & 0x40) /* LBPRZ */
2014 sdkp->lbprz = 1;
e339c1a7 2015
c98a0eb0 2016 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2017 }
2018
0da205e0
MW		 2019 sdkp->capacity = lba + 1;
2020 return sector_size;
2021}
2022
2023static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2024 unsigned char *buffer)
2025{
2026 unsigned char cmd[16];
2027 struct scsi_sense_hdr sshdr;
2028 int sense_valid = 0;
2029 int the_result;
3233ac19 2030 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2031 sector_t lba;
2032 unsigned sector_size;
2033
2034 do {
2035 cmd[0] = READ_CAPACITY;
2036 memset(&cmd[1], 0, 9);
2037 memset(buffer, 0, 8);
2038
2039 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2040 buffer, 8, &sshdr,
2041 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2042
2043 if (media_not_present(sdkp, &sshdr))
2044 return -ENODEV;
2045
3233ac19 2046 if (the_result) {
0da205e0 2047 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2048 if (sense_valid &&
2049 sshdr.sense_key == UNIT_ATTENTION &&
2050 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2051 /* Device reset might occur several times,
2052 * give it one more chance */
2053 if (--reset_retries > 0)
2054 continue;
2055 }
0da205e0
MW		 2056 retries--;
2057
2058 } while (the_result && retries);
2059
2060 if (the_result) {
2061 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2062 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2063 return -EINVAL;
2064 }
2065
8f76d151
DH		 2066 sector_size = get_unaligned_be32(&buffer[4]);
2067 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2068
5ce524bd
HG		 2069 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2070 /* Some buggy (usb cardreader) devices return an lba of
2071 0xffffffff when the want to report a size of 0 (with
2072 which they really mean no media is present) */
2073 sdkp->capacity = 0;
5cc10350 2074 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2075 return sector_size;
2076 }
2077
0da205e0
MW		 2078 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2079 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2080 "kernel compiled with support for large block "
2081 "devices.\n");
2082 sdkp->capacity = 0;
2083 return -EOVERFLOW;
2084 }
2085
2086 sdkp->capacity = lba + 1;
526f7c79 2087 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2088 return sector_size;
2089}
2090
2b301307
MW		 2091static int sd_try_rc16_first(struct scsi_device *sdp)
2092{
f87146bb
HR		 2093 if (sdp->host->max_cmd_len < 16)
2094 return 0;
6a0bdffa
AS		 2095 if (sdp->try_rc_10_first)
2096 return 0;
2b301307
MW		 2097 if (sdp->scsi_level > SCSI_SPC_2)
2098 return 1;
2099 if (scsi_device_protection(sdp))
2100 return 1;
2101 return 0;
2102}
2103
0da205e0
MW		 2104/*
2105 * read disk capacity
2106 */
2107static void
2108sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2109{
2110 int sector_size;
2111 struct scsi_device *sdp = sdkp->device;
70a9b873 2112 sector_t old_capacity = sdkp->capacity;
0da205e0 2113
2b301307 2114 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2115 sector_size = read_capacity_16(sdkp, sdp, buffer);
2116 if (sector_size == -EOVERFLOW)
1da177e4 2117 goto got_data;
2b301307
MW		 2118 if (sector_size == -ENODEV)
2119 return;
2120 if (sector_size < 0)
2121 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2122 if (sector_size < 0)
2123 return;
1da177e4 2124 } else {
0da205e0
MW		 2125 sector_size = read_capacity_10(sdkp, sdp, buffer);
2126 if (sector_size == -EOVERFLOW)
2127 goto got_data;
2128 if (sector_size < 0)
2129 return;
2130 if ((sizeof(sdkp->capacity) > 4) &&
2131 (sdkp->capacity > 0xffffffffULL)) {
2132 int old_sector_size = sector_size;
2133 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2134 "Trying to use READ CAPACITY(16).\n");
2135 sector_size = read_capacity_16(sdkp, sdp, buffer);
2136 if (sector_size < 0) {
2137 sd_printk(KERN_NOTICE, sdkp,
2138 "Using 0xffffffff as device size\n");
2139 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2140 sector_size = old_sector_size;
2141 goto got_data;
2142 }
2143 }
2144 }
1da177e4 2145
5c211caa
AS		 2146 /* Some devices are known to return the total number of blocks,
2147 * not the highest block number. Some devices have versions
2148 * which do this and others which do not. Some devices we might
2149 * suspect of doing this but we don't know for certain.
2150 *
2151 * If we know the reported capacity is wrong, decrement it. If
2152 * we can only guess, then assume the number of blocks is even
2153 * (usually true but not always) and err on the side of lowering
2154 * the capacity.
2155 */
2156 if (sdp->fix_capacity ||
2157 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2158 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2159 "from its reported value: %llu\n",
2160 (unsigned long long) sdkp->capacity);
1da177e4 2161 --sdkp->capacity;
61bf54b7
ON		 2162 }
2163
1da177e4
LT		 2164got_data:
2165 if (sector_size == 0) {
2166 sector_size = 512;
e73aec82
MP		 2167 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2168 "assuming 512.\n");
1da177e4
LT		 2169 }
2170
2171 if (sector_size != 512 &&
2172 sector_size != 1024 &&
2173 sector_size != 2048 &&
2174 sector_size != 4096 &&
2175 sector_size != 256) {
e73aec82
MP		 2176 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2177 sector_size);
1da177e4
LT		 2178 /*
2179 * The user might want to re-format the drive with
2180 * a supported sectorsize. Once this happens, it
2181 * would be relatively trivial to set the thing up.
2182 * For this reason, we leave the thing in the table.
2183 */
2184 sdkp->capacity = 0;
2185 /*
2186 * set a bogus sector size so the normal read/write
2187 * logic in the block layer will eventually refuse any
2188 * request on this device without tripping over power
2189 * of two sector size assumptions
2190 */
2191 sector_size = 512;
2192 }
e1defc4f 2193 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2194
1da177e4 2195 {
7404ad3b 2196 char cap_str_2[10], cap_str_10[10];
520a2c27 2197 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2198
7404ad3b
JB		 2199 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2200 sizeof(cap_str_2));
2201 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2202 sizeof(cap_str_10));
1da177e4 2203
ea09bcc9 2204 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2205 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2206 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2207 (unsigned long long)sdkp->capacity,
2208 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2209
526f7c79 2210 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2211 sd_printk(KERN_NOTICE, sdkp,
2212 "%u-byte physical blocks\n",
526f7c79 2213 sdkp->physical_block_size);
ea09bcc9 2214 }
1da177e4
LT		 2215 }
2216
53ad570b
JH		 2217 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2218
1da177e4
LT		 2219 /* Rescale capacity to 512-byte units */
2220 if (sector_size == 4096)
2221 sdkp->capacity <<= 3;
2222 else if (sector_size == 2048)
2223 sdkp->capacity <<= 2;
2224 else if (sector_size == 1024)
2225 sdkp->capacity <<= 1;
2226 else if (sector_size == 256)
2227 sdkp->capacity >>= 1;
2228
526f7c79
MP		 2229 blk_queue_physical_block_size(sdp->request_queue,
2230 sdkp->physical_block_size);
1da177e4
LT		 2231 sdkp->device->sector_size = sector_size;
2232}
2233
2234/* called with buffer of length 512 */
2235static inline int
ea73a9f2
JB		 2236sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2237 unsigned char *buffer, int len, struct scsi_mode_data *data,
2238 struct scsi_sense_hdr *sshdr)
1da177e4 2239{
ea73a9f2 2240 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2241 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2242 sshdr);
1da177e4
LT		 2243}
2244
2245/*
2246 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2247 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2248 */
2249static void
e73aec82 2250sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2251{
1da177e4 2252 int res;
ea73a9f2 2253 struct scsi_device *sdp = sdkp->device;
1da177e4 2254 struct scsi_mode_data data;
70a9b873 2255 int old_wp = sdkp->write_prot;
1da177e4
LT		 2256
2257 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2258 if (sdp->skip_ms_page_3f) {
e73aec82 2259 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2260 return;
2261 }
2262
ea73a9f2
JB		 2263 if (sdp->use_192_bytes_for_3f) {
2264 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2265 } else {
2266 /*
2267 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2268 * We have to start carefully: some devices hang if we ask
2269 * for more than is available.
2270 */
ea73a9f2 2271 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2272
2273 /*
2274 * Second attempt: ask for page 0 When only page 0 is
2275 * implemented, a request for page 3F may return Sense Key
2276 * 5: Illegal Request, Sense Code 24: Invalid field in
2277 * CDB.
2278 */
2279 if (!scsi_status_is_good(res))
ea73a9f2 2280 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2281
2282 /*
2283 * Third attempt: ask 255 bytes, as we did earlier.
2284 */
2285 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2286 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2287 &data, NULL);
1da177e4
LT		 2288 }
2289
2290 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2291 sd_printk(KERN_WARNING, sdkp,
2292 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2293 } else {
2294 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2295 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2296 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2297 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2298 sdkp->write_prot ? "on" : "off");
2299 sd_printk(KERN_DEBUG, sdkp,
2300 "Mode Sense: %02x %02x %02x %02x\n",
2301 buffer[0], buffer[1], buffer[2], buffer[3]);
2302 }
1da177e4
LT		 2303 }
2304}
2305
2306/*
2307 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2308 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2309 */
2310static void
e73aec82 2311sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2312{
1da177e4 2313 int len = 0, res;
ea73a9f2 2314 struct scsi_device *sdp = sdkp->device;
1da177e4 2315
631e8a13
AV		 2316 int dbd;
2317 int modepage;
0bcaa111 2318 int first_len;
1da177e4
LT		 2319 struct scsi_mode_data data;
2320 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2321 int old_wce = sdkp->WCE;
2322 int old_rcd = sdkp->RCD;
2323 int old_dpofua = sdkp->DPOFUA;
1da177e4 2324
39c60a09
JB		 2325
2326 if (sdkp->cache_override)
2327 return;
2328
0bcaa111
LT		 2329 first_len = 4;
2330 if (sdp->skip_ms_page_8) {
2331 if (sdp->type == TYPE_RBC)
2332 goto defaults;
2333 else {
2334 if (sdp->skip_ms_page_3f)
2335 goto defaults;
2336 modepage = 0x3F;
2337 if (sdp->use_192_bytes_for_3f)
2338 first_len = 192;
2339 dbd = 0;
2340 }
2341 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2342 modepage = 6;
2343 dbd = 8;
2344 } else {
2345 modepage = 8;
2346 dbd = 0;
2347 }
2348
1da177e4 2349 /* cautiously ask */
0bcaa111
LT		 2350 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2351 &data, &sshdr);
1da177e4
LT		 2352
2353 if (!scsi_status_is_good(res))
2354 goto bad_sense;
2355
6d73c851
AV		 2356 if (!data.header_length) {
2357 modepage = 6;
0bcaa111 2358 first_len = 0;
e73aec82 2359 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2360 }
2361
1da177e4
LT		 2362 /* that went OK, now ask for the proper length */
2363 len = data.length;
2364
2365 /*
2366 * We're only interested in the first three bytes, actually.
2367 * But the data cache page is defined for the first 20.
2368 */
2369 if (len < 3)
2370 goto bad_sense;
0bcaa111
LT		 2371 else if (len > SD_BUF_SIZE) {
2372 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2373 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2374 len = SD_BUF_SIZE;
2375 }
2376 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2377 len = 192;
1da177e4
LT		 2378
2379 /* Get the data */
0bcaa111
LT		 2380 if (len > first_len)
2381 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2382 &data, &sshdr);
1da177e4
LT		 2383
2384 if (scsi_status_is_good(res)) {
631e8a13 2385 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2386
0bcaa111
LT		 2387 while (offset < len) {
2388 u8 page_code = buffer[offset] & 0x3F;
2389 u8 spf = buffer[offset] & 0x40;
2390
2391 if (page_code == 8 || page_code == 6) {
2392 /* We're interested only in the first 3 bytes.
2393 */
2394 if (len - offset <= 2) {
2395 sd_printk(KERN_ERR, sdkp, "Incomplete "
2396 "mode parameter data\n");
2397 goto defaults;
2398 } else {
2399 modepage = page_code;
2400 goto Page_found;
2401 }
2402 } else {
2403 /* Go to the next page */
2404 if (spf && len - offset > 3)
2405 offset += 4 + (buffer[offset+2] << 8) +
2406 buffer[offset+3];
2407 else if (!spf && len - offset > 1)
2408 offset += 2 + buffer[offset+1];
2409 else {
2410 sd_printk(KERN_ERR, sdkp, "Incomplete "
2411 "mode parameter data\n");
2412 goto defaults;
2413 }
2414 }
48970800
AV		 2415 }
2416
0bcaa111
LT		 2417 if (modepage == 0x3F) {
2418 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2419 "present\n");
2420 goto defaults;
2421 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2422 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2423 goto defaults;
2424 }
0bcaa111 2425 Page_found:
631e8a13
AV		 2426 if (modepage == 8) {
2427 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2428 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2429 } else {
2430 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2431 sdkp->RCD = 0;
2432 }
1da177e4 2433
007365ad
TH		 2434 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2435 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2436 sd_printk(KERN_NOTICE, sdkp,
2437 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2438 sdkp->DPOFUA = 0;
2439 }
2440
70a9b873
MP		 2441 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2442 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2443 sd_printk(KERN_NOTICE, sdkp,
2444 "Write cache: %s, read cache: %s, %s\n",
2445 sdkp->WCE ? "enabled" : "disabled",
2446 sdkp->RCD ? "disabled" : "enabled",
2447 sdkp->DPOFUA ? "supports DPO and FUA"
2448 : "doesn't support DPO or FUA");
1da177e4
LT		 2449
2450 return;
2451 }
2452
2453bad_sense:
ea73a9f2 2454 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2455 sshdr.sense_key == ILLEGAL_REQUEST &&
2456 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2457 /* Invalid field in CDB */
2458 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2459 else
e73aec82 2460 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2461
2462defaults:
b81478d8
NJ		 2463 if (sdp->wce_default_on) {
2464 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2465 sdkp->WCE = 1;
2466 } else {
2467 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2468 sdkp->WCE = 0;
2469 }
1da177e4 2470 sdkp->RCD = 0;
48970800 2471 sdkp->DPOFUA = 0;
1da177e4
LT		 2472}
2473
e0597d70
MP		 2474/*
2475 * The ATO bit indicates whether the DIF application tag is available
2476 * for use by the operating system.
2477 */
439d77f7 2478static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2479{
2480 int res, offset;
2481 struct scsi_device *sdp = sdkp->device;
2482 struct scsi_mode_data data;
2483 struct scsi_sense_hdr sshdr;
2484
2485 if (sdp->type != TYPE_DISK)
2486 return;
2487
2488 if (sdkp->protection_type == 0)
2489 return;
2490
2491 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2492 SD_MAX_RETRIES, &data, &sshdr);
2493
2494 if (!scsi_status_is_good(res) || !data.header_length ||
2495 data.length < 6) {
2496 sd_printk(KERN_WARNING, sdkp,
2497 "getting Control mode page failed, assume no ATO\n");
2498
2499 if (scsi_sense_valid(&sshdr))
2500 sd_print_sense_hdr(sdkp, &sshdr);
2501
2502 return;
2503 }
2504
2505 offset = data.header_length + data.block_descriptor_length;
2506
2507 if ((buffer[offset] & 0x3f) != 0x0a) {
2508 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2509 return;
2510 }
2511
2512 if ((buffer[offset + 5] & 0x80) == 0)
2513 return;
2514
2515 sdkp->ATO = 1;
2516
2517 return;
2518}
2519
d11b6916
MP		 2520/**
2521 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2522 * @disk: disk to query
2523 */
2524static void sd_read_block_limits(struct scsi_disk *sdkp)
2525{
2526 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2527 const int vpd_len = 64;
e3deec09 2528 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2529
e3deec09
JB		 2530 if (!buffer ||
2531 /* Block Limits VPD */
2532 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2533 goto out;
d11b6916
MP		 2534
2535 blk_queue_io_min(sdkp->disk->queue,
2536 get_unaligned_be16(&buffer[6]) * sector_sz);
2537 blk_queue_io_opt(sdkp->disk->queue,
2538 get_unaligned_be32(&buffer[12]) * sector_sz);
2539
c98a0eb0
MP		 2540 if (buffer[3] == 0x3c) {
2541 unsigned int lba_count, desc_count;
e339c1a7 2542
5db44863 2543 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2544
c98a0eb0 2545 if (!sdkp->lbpme)
045d3fe7 2546 goto out;
045d3fe7 2547
c98a0eb0
MP		 2548 lba_count = get_unaligned_be32(&buffer[20]);
2549 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2550
c98a0eb0
MP		 2551 if (lba_count && desc_count)
2552 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2553
c98a0eb0 2554 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2555
2556 if (buffer[32] & 0x80)
c98a0eb0 2557 sdkp->unmap_alignment =
e339c1a7 2558 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2559
2560 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2561
2562 if (sdkp->max_unmap_blocks)
2563 sd_config_discard(sdkp, SD_LBP_UNMAP);
2564 else
2565 sd_config_discard(sdkp, SD_LBP_WS16);
2566
2567 } else { /* LBP VPD page tells us what to use */
2568
2569 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2570 sd_config_discard(sdkp, SD_LBP_UNMAP);
2571 else if (sdkp->lbpws)
2572 sd_config_discard(sdkp, SD_LBP_WS16);
2573 else if (sdkp->lbpws10)
2574 sd_config_discard(sdkp, SD_LBP_WS10);
2575 else
2576 sd_config_discard(sdkp, SD_LBP_DISABLE);
2577 }
e339c1a7
MP		 2578 }
2579
e3deec09 2580 out:
d11b6916
MP		 2581 kfree(buffer);
2582}
2583
3821d768
MP		 2584/**
2585 * sd_read_block_characteristics - Query block dev. characteristics
2586 * @disk: disk to query
2587 */
2588static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2589{
e3deec09 2590 unsigned char *buffer;
3821d768 2591 u16 rot;
bb2d3de1 2592 const int vpd_len = 64;
3821d768 2593
e3deec09 2594 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2595
e3deec09
JB		 2596 if (!buffer ||
2597 /* Block Device Characteristics VPD */
2598 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2599 goto out;
3821d768
MP		 2600
2601 rot = get_unaligned_be16(&buffer[4]);
2602
2603 if (rot == 1)
2604 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2605
e3deec09 2606 out:
3821d768
MP		 2607 kfree(buffer);
2608}
2609
045d3fe7 2610/**
c98a0eb0 2611 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2612 * @disk: disk to query
2613 */
c98a0eb0 2614static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2615{
2616 unsigned char *buffer;
2617 const int vpd_len = 8;
2618
c98a0eb0 2619 if (sdkp->lbpme == 0)
045d3fe7
MP		 2620 return;
2621
2622 buffer = kmalloc(vpd_len, GFP_KERNEL);
2623
2624 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2625 goto out;
2626
c98a0eb0
MP		 2627 sdkp->lbpvpd = 1;
2628 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2629 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2630 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2631
2632 out:
2633 kfree(buffer);
2634}
2635
5db44863
MP		 2636static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2637{
2638 if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2639 WRITE_SAME_16))
2640 sdkp->ws16 = 1;
2641}
2642
ffd4bc2a
MP		 2643static int sd_try_extended_inquiry(struct scsi_device *sdp)
2644{
2645 /*
2646 * Although VPD inquiries can go to SCSI-2 type devices,
2647 * some USB ones crash on receiving them, and the pages
2648 * we currently ask for are for SPC-3 and beyond
2649 */
09b6b51b 2650 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2651 return 1;
2652 return 0;
2653}
2654
1da177e4
LT		 2655/**
2656 * sd_revalidate_disk - called the first time a new disk is seen,
2657 * performs disk spin up, read_capacity, etc.
2658 * @disk: struct gendisk we care about
2659 **/
2660static int sd_revalidate_disk(struct gendisk *disk)
2661{
2662 struct scsi_disk *sdkp = scsi_disk(disk);
2663 struct scsi_device *sdp = sdkp->device;
1da177e4 2664 unsigned char *buffer;
4913efe4 2665 unsigned flush = 0;
1da177e4 2666
fa0d34be
MP		 2667 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2668 "sd_revalidate_disk\n"));
1da177e4
LT		 2669
2670 /*
2671 * If the device is offline, don't try and read capacity or any
2672 * of the other niceties.
2673 */
2674 if (!scsi_device_online(sdp))
2675 goto out;
2676
a6123f14 2677 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2678 if (!buffer) {
e73aec82
MP		 2679 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2680 "allocation failure.\n");
ea73a9f2 2681 goto out;
1da177e4
LT		 2682 }
2683
e73aec82 2684 sd_spinup_disk(sdkp);
1da177e4
LT		 2685
2686 /*
2687 * Without media there is no reason to ask; moreover, some devices
2688 * react badly if we do.
2689 */
2690 if (sdkp->media_present) {
e73aec82 2691 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2692
2693 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2694 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2695 sd_read_block_limits(sdkp);
2696 sd_read_block_characteristics(sdkp);
2697 }
2698
e73aec82
MP		 2699 sd_read_write_protect_flag(sdkp, buffer);
2700 sd_read_cache_type(sdkp, buffer);
e0597d70 2701 sd_read_app_tag_own(sdkp, buffer);
5db44863 2702 sd_read_write_same(sdkp, buffer);
1da177e4 2703 }
461d4e90 2704
70a9b873
MP		 2705 sdkp->first_scan = 0;
2706
461d4e90
TH		 2707 /*
2708 * We now have all cache related info, determine how we deal
4913efe4 2709 * with flush requests.
461d4e90 2710 */
4913efe4
TH		 2711 if (sdkp->WCE) {
2712 flush |= REQ_FLUSH;
2713 if (sdkp->DPOFUA)
2714 flush |= REQ_FUA;
2715 }
461d4e90 2716
4913efe4 2717 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2718
1da177e4 2719 set_capacity(disk, sdkp->capacity);
5db44863 2720 sd_config_write_same(sdkp);
1da177e4
LT		 2721 kfree(buffer);
2722
1da177e4
LT		 2723 out:
2724 return 0;
2725}
2726
72ec24bd
TH		 2727/**
2728 * sd_unlock_native_capacity - unlock native capacity
2729 * @disk: struct gendisk to set capacity for
2730 *
2731 * Block layer calls this function if it detects that partitions
2732 * on @disk reach beyond the end of the device. If the SCSI host
2733 * implements ->unlock_native_capacity() method, it's invoked to
2734 * give it a chance to adjust the device capacity.
2735 *
2736 * CONTEXT:
2737 * Defined by block layer. Might sleep.
2738 */
2739static void sd_unlock_native_capacity(struct gendisk *disk)
2740{
2741 struct scsi_device *sdev = scsi_disk(disk)->device;
2742
2743 if (sdev->host->hostt->unlock_native_capacity)
2744 sdev->host->hostt->unlock_native_capacity(sdev);
2745}
2746
3e1a7ff8
TH		 2747/**
2748 * sd_format_disk_name - format disk name
2749 * @prefix: name prefix - ie. "sd" for SCSI disks
2750 * @index: index of the disk to format name for
2751 * @buf: output buffer
2752 * @buflen: length of the output buffer
2753 *
2754 * SCSI disk names starts at sda. The 26th device is sdz and the
2755 * 27th is sdaa. The last one for two lettered suffix is sdzz
2756 * which is followed by sdaaa.
2757 *
2758 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2759 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2760 * determined using similar method as 26 base conversion with the
2761 * index shifted -1 after each digit is computed.
2762 *
2763 * CONTEXT:
2764 * Don't care.
2765 *
2766 * RETURNS:
2767 * 0 on success, -errno on failure.
2768 */
2769static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2770{
2771 const int base = 'z' - 'a' + 1;
2772 char *begin = buf + strlen(prefix);
2773 char *end = buf + buflen;
2774 char *p;
2775 int unit;
2776
2777 p = end - 1;
2778 *p = '\0';
2779 unit = base;
2780 do {
2781 if (p == begin)
2782 return -EINVAL;
2783 *--p = 'a' + (index % unit);
2784 index = (index / unit) - 1;
2785 } while (index >= 0);
2786
2787 memmove(begin, p, end - p);
2788 memcpy(buf, prefix, strlen(prefix));
2789
2790 return 0;
2791}
2792
4ace92fc
AV		 2793/*
2794 * The asynchronous part of sd_probe
2795 */
2796static void sd_probe_async(void *data, async_cookie_t cookie)
2797{
2798 struct scsi_disk *sdkp = data;
2799 struct scsi_device *sdp;
2800 struct gendisk *gd;
2801 u32 index;
2802 struct device *dev;
2803
2804 sdp = sdkp->device;
2805 gd = sdkp->disk;
2806 index = sdkp->index;
2807 dev = &sdp->sdev_gendev;
2808
1a03ae0f
MR		 2809 gd->major = sd_major((index & 0xf0) >> 4);
2810 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2811 gd->minors = SD_MINORS;
2812
4ace92fc
AV		 2813 gd->fops = &sd_fops;
2814 gd->private_data = &sdkp->driver;
2815 gd->queue = sdkp->device->request_queue;
2816
70a9b873
MP		 2817 /* defaults, until the device tells us otherwise */
2818 sdp->sector_size = 512;
2819 sdkp->capacity = 0;
2820 sdkp->media_present = 1;
2821 sdkp->write_prot = 0;
39c60a09 2822 sdkp->cache_override = 0;
70a9b873
MP		 2823 sdkp->WCE = 0;
2824 sdkp->RCD = 0;
2825 sdkp->ATO = 0;
2826 sdkp->first_scan = 1;
18a4d0a2 2827 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2828
4ace92fc
AV		 2829 sd_revalidate_disk(gd);
2830
2831 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2832 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2833
2834 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2835 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2836 if (sdp->removable) {
4ace92fc 2837 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2838 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2839 }
4ace92fc 2840
4ace92fc 2841 add_disk(gd);
fe542396
MP		 2842 if (sdkp->capacity)
2843 sd_dif_config_host(sdkp);
4ace92fc 2844
3821d768
MP		 2845 sd_revalidate_disk(gd);
2846
4ace92fc
AV		 2847 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2848 sdp->removable ? "removable " : "");
6df339a5 2849 blk_pm_runtime_init(sdp->request_queue, dev);
478a8a05 2850 scsi_autopm_put_device(sdp);
ea038f63 2851 put_device(&sdkp->dev);
4ace92fc
AV		 2852}
2853
1da177e4
LT		 2854/**
2855 * sd_probe - called during driver initialization and whenever a
2856 * new scsi device is attached to the system. It is called once
2857 * for each scsi device (not just disks) present.
2858 * @dev: pointer to device object
2859 *
2860 * Returns 0 if successful (or not interested in this scsi device
2861 * (e.g. scanner)); 1 when there is an error.
2862 *
2863 * Note: this function is invoked from the scsi mid-level.
2864 * This function sets up the mapping between a given
2865 * <host,channel,id,lun> (found in sdp) and new device name
2866 * (e.g. /dev/sda). More precisely it is the block device major
2867 * and minor number that is chosen here.
2868 *
2db93ce8
PU		 2869 * Assume sd_probe is not re-entrant (for time being)
2870 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2871 **/
2872static int sd_probe(struct device *dev)
2873{
2874 struct scsi_device *sdp = to_scsi_device(dev);
2875 struct scsi_disk *sdkp;
2876 struct gendisk *gd;
439d77f7 2877 int index;
1da177e4
LT		 2878 int error;
2879
2880 error = -ENODEV;
631e8a13 2881 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2882 goto out;
2883
9ccfc756 2884 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2885 "sd_probe\n"));
1da177e4
LT		 2886
2887 error = -ENOMEM;
24669f75 2888 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2889 if (!sdkp)
2890 goto out;
2891
689d6fac 2892 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2893 if (!gd)
2894 goto out_free;
2895
f27bac27
TH		 2896 do {
2897 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2898 goto out_put;
1da177e4 2899
4034cc68 2900 spin_lock(&sd_index_lock);
f27bac27 2901 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2902 spin_unlock(&sd_index_lock);
f27bac27 2903 } while (error == -EAGAIN);
1da177e4 2904
21208ae5
DK		 2905 if (error) {
2906 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2907 goto out_put;
1a03ae0f
MR		 2908 }
2909
3e1a7ff8 2910 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2911 if (error) {
2912 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2913 goto out_free_index;
21208ae5 2914 }
f27bac27 2915
1da177e4
LT		 2916 sdkp->device = sdp;
2917 sdkp->driver = &sd_template;
2918 sdkp->disk = gd;
2919 sdkp->index = index;
409f3499 2920 atomic_set(&sdkp->openers, 0);
9e1a1537 2921 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2922
601e7638
JB		 2923 if (!sdp->request_queue->rq_timeout) {
2924 if (sdp->type != TYPE_MOD)
2925 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2926 else
2927 blk_queue_rq_timeout(sdp->request_queue,
2928 SD_MOD_TIMEOUT);
2929 }
2930
2931 device_initialize(&sdkp->dev);
478a8a05 2932 sdkp->dev.parent = dev;
601e7638 2933 sdkp->dev.class = &sd_disk_class;
478a8a05 2934 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2935
2936 if (device_add(&sdkp->dev))
2937 goto out_free_index;
2938
478a8a05
AS		 2939 get_device(dev);
2940 dev_set_drvdata(dev, sdkp);
601e7638 2941
ea038f63 2942 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2943 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2944
2945 return 0;
2946
f27bac27 2947 out_free_index:
4034cc68 2948 spin_lock(&sd_index_lock);
f27bac27 2949 ida_remove(&sd_index_ida, index);
4034cc68 2950 spin_unlock(&sd_index_lock);
6bdaa1f1 2951 out_put:
1da177e4 2952 put_disk(gd);
6bdaa1f1 2953 out_free:
1da177e4 2954 kfree(sdkp);
6bdaa1f1 2955 out:
1da177e4
LT		 2956 return error;
2957}
2958
2959/**
2960 * sd_remove - called whenever a scsi disk (previously recognized by
2961 * sd_probe) is detached from the system. It is called (potentially
2962 * multiple times) during sd module unload.
2963 * @sdp: pointer to mid level scsi device object
2964 *
2965 * Note: this function is invoked from the scsi mid-level.
2966 * This function potentially frees up a device name (e.g. /dev/sdc)
2967 * that could be re-used by a subsequent sd_probe().
2968 * This function is not called when the built-in sd driver is "exit-ed".
2969 **/
2970static int sd_remove(struct device *dev)
2971{
601e7638 2972 struct scsi_disk *sdkp;
1da177e4 2973
601e7638 2974 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2975 scsi_autopm_get_device(sdkp->device);
2976
a7a20d10 2977 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2978 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2979 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2980 device_del(&sdkp->dev);
1da177e4
LT		 2981 del_gendisk(sdkp->disk);
2982 sd_shutdown(dev);
39b7f1e2 2983
0b950672 2984 mutex_lock(&sd_ref_mutex);
39b7f1e2 2985 dev_set_drvdata(dev, NULL);
ee959b00 2986 put_device(&sdkp->dev);
0b950672 2987 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2988
2989 return 0;
2990}
2991
2992/**
2993 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2994 * @dev: pointer to embedded class device
1da177e4 2995 *
0b950672 2996 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2997 * called on last put, you should always use the scsi_disk_get()
2998 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2999 * and never do a direct put_device.
1da177e4 3000 **/
ee959b00 3001static void scsi_disk_release(struct device *dev)
1da177e4 3002{
ee959b00 3003 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3004 struct gendisk *disk = sdkp->disk;
3005
4034cc68 3006 spin_lock(&sd_index_lock);
f27bac27 3007 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3008 spin_unlock(&sd_index_lock);
1da177e4
LT		 3009
3010 disk->private_data = NULL;
1da177e4 3011 put_disk(disk);
39b7f1e2 3012 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3013
3014 kfree(sdkp);
3015}
3016
cc5d2c8c 3017static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3018{
3019 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3020 struct scsi_sense_hdr sshdr;
cc5d2c8c 3021 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3022 int res;
3023
3024 if (start)
3025 cmd[4] |= 1; /* START */
3026
d2886ea3
SR		 3027 if (sdp->start_stop_pwr_cond)
3028 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3029
c3c94c5a
TH		 3030 if (!scsi_device_online(sdp))
3031 return -ENODEV;
3032
9b21493c
LM		 3033 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3034 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3035 if (res) {
cc5d2c8c
JB		 3036 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3037 sd_print_result(sdkp, res);
c3c94c5a 3038 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3039 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 3040 }
3041
3042 return res;
3043}
3044
1da177e4
LT		 3045/*
3046 * Send a SYNCHRONIZE CACHE instruction down to the device through
3047 * the normal SCSI command structure. Wait for the command to
3048 * complete.
3049 */
3050static void sd_shutdown(struct device *dev)
3051{
39b7f1e2 3052 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3053
3054 if (!sdkp)
3055 return; /* this can happen */
3056
54f57588
LM		 3057 if (pm_runtime_suspended(dev))
3058 goto exit;
3059
39b7f1e2 3060 if (sdkp->WCE) {
e73aec82
MP		 3061 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3062 sd_sync_cache(sdkp);
39b7f1e2 3063 }
c3c94c5a 3064
cc5d2c8c
JB		 3065 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3066 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3067 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3068 }
3069
54f57588 3070exit:
39b7f1e2
AS		 3071 scsi_disk_put(sdkp);
3072}
1da177e4 3073
691e3d31 3074static int sd_suspend(struct device *dev)
c3c94c5a 3075{
c3c94c5a 3076 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3077 int ret = 0;
c3c94c5a
TH		 3078
3079 if (!sdkp)
3080 return 0; /* this can happen */
3081
3082 if (sdkp->WCE) {
cc5d2c8c 3083 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 3084 ret = sd_sync_cache(sdkp);
3085 if (ret)
09ff92fe 3086 goto done;
c3c94c5a
TH		 3087 }
3088
691e3d31 3089 if (sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 3090 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3091 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3092 }
3093
09ff92fe
AS		 3094done:
3095 scsi_disk_put(sdkp);
3096 return ret;
c3c94c5a
TH		 3097}
3098
3099static int sd_resume(struct device *dev)
3100{
c3c94c5a 3101 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3102 int ret = 0;
c3c94c5a 3103
cc5d2c8c 3104 if (!sdkp->device->manage_start_stop)
09ff92fe 3105 goto done;
c3c94c5a 3106
cc5d2c8c 3107 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3108 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3109
09ff92fe
AS		 3110done:
3111 scsi_disk_put(sdkp);
3112 return ret;
c3c94c5a
TH		 3113}
3114
1da177e4
LT		 3115/**
3116 * init_sd - entry point for this driver (both when built in or when
3117 * a module).
3118 *
3119 * Note: this function registers this driver with the scsi mid-level.
3120 **/
3121static int __init init_sd(void)
3122{
5e4009ba 3123 int majors = 0, i, err;
1da177e4
LT		 3124
3125 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3126
3127 for (i = 0; i < SD_MAJORS; i++)
3128 if (register_blkdev(sd_major(i), "sd") == 0)
3129 majors++;
3130
3131 if (!majors)
3132 return -ENODEV;
3133
5e4009ba
JG		 3134 err = class_register(&sd_disk_class);
3135 if (err)
3136 goto err_out;
6bdaa1f1 3137
4e7392ec
MP		 3138 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3139 0, 0, NULL);
3140 if (!sd_cdb_cache) {
3141 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3142 goto err_out_class;
3143 }
3144
3145 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3146 if (!sd_cdb_pool) {
3147 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3148 goto err_out_cache;
3149 }
3150
afd5e34b
JD		 3151 err = scsi_register_driver(&sd_template.gendrv);
3152 if (err)
3153 goto err_out_driver;
3154
5e4009ba
JG		 3155 return 0;
3156
afd5e34b
JD		 3157err_out_driver:
3158 mempool_destroy(sd_cdb_pool);
3159
4e7392ec
MP		 3160err_out_cache:
3161 kmem_cache_destroy(sd_cdb_cache);
3162
5e4009ba
JG		 3163err_out_class:
3164 class_unregister(&sd_disk_class);
3165err_out:
3166 for (i = 0; i < SD_MAJORS; i++)
3167 unregister_blkdev(sd_major(i), "sd");
3168 return err;
1da177e4
LT		 3169}
3170
3171/**
3172 * exit_sd - exit point for this driver (when it is a module).
3173 *
3174 * Note: this function unregisters this driver from the scsi mid-level.
3175 **/
3176static void __exit exit_sd(void)
3177{
3178 int i;
3179
3180 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3181
afd5e34b 3182 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3183 mempool_destroy(sd_cdb_pool);
3184 kmem_cache_destroy(sd_cdb_cache);
3185
5e4009ba
JG		 3186 class_unregister(&sd_disk_class);
3187
1da177e4
LT		 3188 for (i = 0; i < SD_MAJORS; i++)
3189 unregister_blkdev(sd_major(i), "sd");
3190}
3191
1da177e4
LT		 3192module_init(init_sd);
3193module_exit(exit_sd);
e73aec82
MP		 3194
3195static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3196 struct scsi_sense_hdr *sshdr)
3197{
2e4c3329 3198 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3199 scsi_show_sense_hdr(sshdr);
2e4c3329 3200 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3201 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3202}
3203
3204static void sd_print_result(struct scsi_disk *sdkp, int result)
3205{
2e4c3329 3206 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3207 scsi_show_result(result);
3208}
3209
Linux 6.x block layer and io_uring tree(s)