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[SCSI] Add a report opcode helper
[deliverable/linux.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);
7b3d9545 102static int sd_revalidate_disk(struct gendisk *);
72ec24bd 103static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 104static int sd_probe(struct device *);
105static int sd_remove(struct device *);
106static void sd_shutdown(struct device *);
107static int sd_suspend(struct device *, pm_message_t state);
108static int sd_resume(struct device *);
109static void sd_rescan(struct device *);
110static int sd_done(struct scsi_cmnd *);
18a4d0a2 111static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 112static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 113static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 114static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115static void sd_print_result(struct scsi_disk *, int);
116
4034cc68 117static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 118static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 119
120/* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
0b950672 123static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 124
439d77f7
HS		 125static struct kmem_cache *sd_cdb_cache;
126static mempool_t *sd_cdb_pool;
4e7392ec 127
6bdaa1f1
JB		 128static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131};
132
ee959b00
TJ		 133static ssize_t
134sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
6bdaa1f1
JB		 136{
137 int i, ct = -1, rcd, wce, sp;
ee959b00 138 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
6391a113 152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 153 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
a9312fb8 167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
e73aec82 178 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 179 return -EINVAL;
180 }
f98a8cae 181 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 182 return count;
183}
184
ee959b00
TJ		 185static ssize_t
186sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
c3c94c5a 188{
ee959b00 189 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198}
199
ee959b00
TJ		 200static ssize_t
201sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
a144c5ae 203{
ee959b00 204 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216}
217
ee959b00
TJ		 218static ssize_t
219sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
6bdaa1f1 221{
ee959b00 222 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226}
227
ee959b00
TJ		 228static ssize_t
229sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 230{
ee959b00 231 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234}
235
ee959b00
TJ		 236static ssize_t
237sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
c3c94c5a 239{
ee959b00 240 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244}
245
ee959b00
TJ		 246static ssize_t
247sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
a144c5ae 249{
ee959b00 250 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253}
254
e0597d70
MP		 255static ssize_t
256sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262}
263
8172499a
MP		 264static ssize_t
265sd_store_protection_type(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
267{
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 unsigned int val;
270 int err;
271
272 if (!capable(CAP_SYS_ADMIN))
273 return -EACCES;
274
275 err = kstrtouint(buf, 10, &val);
276
277 if (err)
278 return err;
279
280 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
281 sdkp->protection_type = val;
282
283 return count;
284}
285
518fa8e3
MP		 286static ssize_t
287sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
288 char *buf)
289{
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291 struct scsi_device *sdp = sdkp->device;
292 unsigned int dif, dix;
293
294 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
295 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
296
297 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
298 dif = 0;
299 dix = 1;
300 }
301
302 if (!dif && !dix)
303 return snprintf(buf, 20, "none\n");
304
305 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
306}
307
e0597d70
MP		 308static ssize_t
309sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
310 char *buf)
311{
312 struct scsi_disk *sdkp = to_scsi_disk(dev);
313
314 return snprintf(buf, 20, "%u\n", sdkp->ATO);
315}
316
e339c1a7
MP		 317static ssize_t
318sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
319 char *buf)
320{
321 struct scsi_disk *sdkp = to_scsi_disk(dev);
322
c98a0eb0
MP		 323 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
324}
325
326static const char *lbp_mode[] = {
327 [SD_LBP_FULL] = "full",
328 [SD_LBP_UNMAP] = "unmap",
329 [SD_LBP_WS16] = "writesame_16",
330 [SD_LBP_WS10] = "writesame_10",
331 [SD_LBP_ZERO] = "writesame_zero",
332 [SD_LBP_DISABLE] = "disabled",
333};
334
335static ssize_t
336sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
337 char *buf)
338{
339 struct scsi_disk *sdkp = to_scsi_disk(dev);
340
341 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
342}
343
344static ssize_t
345sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count)
347{
348 struct scsi_disk *sdkp = to_scsi_disk(dev);
349 struct scsi_device *sdp = sdkp->device;
350
351 if (!capable(CAP_SYS_ADMIN))
352 return -EACCES;
353
354 if (sdp->type != TYPE_DISK)
355 return -EINVAL;
356
357 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
358 sd_config_discard(sdkp, SD_LBP_UNMAP);
359 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
360 sd_config_discard(sdkp, SD_LBP_WS16);
361 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
362 sd_config_discard(sdkp, SD_LBP_WS10);
363 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
364 sd_config_discard(sdkp, SD_LBP_ZERO);
365 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
366 sd_config_discard(sdkp, SD_LBP_DISABLE);
367 else
368 return -EINVAL;
369
370 return count;
e339c1a7
MP		 371}
372
18a4d0a2
MP		 373static ssize_t
374sd_show_max_medium_access_timeouts(struct device *dev,
375 struct device_attribute *attr, char *buf)
376{
377 struct scsi_disk *sdkp = to_scsi_disk(dev);
378
379 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
380}
381
382static ssize_t
383sd_store_max_medium_access_timeouts(struct device *dev,
384 struct device_attribute *attr,
385 const char *buf, size_t count)
386{
387 struct scsi_disk *sdkp = to_scsi_disk(dev);
388 int err;
389
390 if (!capable(CAP_SYS_ADMIN))
391 return -EACCES;
392
393 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
394
395 return err ? err : count;
396}
397
ee959b00 398static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 399 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
400 sd_store_cache_type),
401 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 402 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
403 sd_store_allow_restart),
c3c94c5a
TH		 404 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
405 sd_store_manage_start_stop),
8172499a
MP		 406 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
407 sd_store_protection_type),
518fa8e3 408 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 409 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 410 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 411 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
412 sd_store_provisioning_mode),
18a4d0a2
MP		 413 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
414 sd_show_max_medium_access_timeouts,
415 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 416 __ATTR_NULL,
417};
418
419static struct class sd_disk_class = {
420 .name = "scsi_disk",
421 .owner = THIS_MODULE,
ee959b00
TJ		 422 .dev_release = scsi_disk_release,
423 .dev_attrs = sd_disk_attrs,
6bdaa1f1 424};
1da177e4
LT		 425
426static struct scsi_driver sd_template = {
427 .owner = THIS_MODULE,
428 .gendrv = {
429 .name = "sd",
430 .probe = sd_probe,
431 .remove = sd_remove,
c3c94c5a
TH		 432 .suspend = sd_suspend,
433 .resume = sd_resume,
1da177e4
LT		 434 .shutdown = sd_shutdown,
435 },
436 .rescan = sd_rescan,
7b3d9545 437 .done = sd_done,
18a4d0a2 438 .eh_action = sd_eh_action,
1da177e4
LT		 439};
440
441/*
442 * Device no to disk mapping:
443 *
444 * major disc2 disc p1
445 * |............|.............|....|....| <- dev_t
446 * 31 20 19 8 7 4 3 0
447 *
448 * Inside a major, we have 16k disks, however mapped non-
449 * contiguously. The first 16 disks are for major0, the next
450 * ones with major1, ... Disk 256 is for major0 again, disk 272
451 * for major1, ...
452 * As we stay compatible with our numbering scheme, we can reuse
453 * the well-know SCSI majors 8, 65--71, 136--143.
454 */
455static int sd_major(int major_idx)
456{
457 switch (major_idx) {
458 case 0:
459 return SCSI_DISK0_MAJOR;
460 case 1 ... 7:
461 return SCSI_DISK1_MAJOR + major_idx - 1;
462 case 8 ... 15:
463 return SCSI_DISK8_MAJOR + major_idx - 8;
464 default:
465 BUG();
466 return 0; /* shut up gcc */
467 }
468}
469
39b7f1e2 470static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 471{
472 struct scsi_disk *sdkp = NULL;
473
39b7f1e2
AS		 474 if (disk->private_data) {
475 sdkp = scsi_disk(disk);
476 if (scsi_device_get(sdkp->device) == 0)
ee959b00 477 get_device(&sdkp->dev);
39b7f1e2
AS		 478 else
479 sdkp = NULL;
480 }
481 return sdkp;
482}
483
484static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
485{
486 struct scsi_disk *sdkp;
487
0b950672 488 mutex_lock(&sd_ref_mutex);
39b7f1e2 489 sdkp = __scsi_disk_get(disk);
0b950672 490 mutex_unlock(&sd_ref_mutex);
1da177e4 491 return sdkp;
39b7f1e2 492}
1da177e4 493
39b7f1e2
AS		 494static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
495{
496 struct scsi_disk *sdkp;
497
0b950672 498 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 499 sdkp = dev_get_drvdata(dev);
500 if (sdkp)
501 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 502 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 503 return sdkp;
504}
505
506static void scsi_disk_put(struct scsi_disk *sdkp)
507{
508 struct scsi_device *sdev = sdkp->device;
509
0b950672 510 mutex_lock(&sd_ref_mutex);
ee959b00 511 put_device(&sdkp->dev);
1da177e4 512 scsi_device_put(sdev);
0b950672 513 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 514}
515
35e1a5d9
MP		 516static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
517{
518 unsigned int prot_op = SCSI_PROT_NORMAL;
519 unsigned int dix = scsi_prot_sg_count(scmd);
520
521 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
522 if (dif && dix)
523 prot_op = SCSI_PROT_READ_PASS;
524 else if (dif && !dix)
525 prot_op = SCSI_PROT_READ_STRIP;
526 else if (!dif && dix)
527 prot_op = SCSI_PROT_READ_INSERT;
528 } else {
529 if (dif && dix)
530 prot_op = SCSI_PROT_WRITE_PASS;
531 else if (dif && !dix)
532 prot_op = SCSI_PROT_WRITE_INSERT;
533 else if (!dif && dix)
534 prot_op = SCSI_PROT_WRITE_STRIP;
535 }
536
537 scsi_set_prot_op(scmd, prot_op);
538 scsi_set_prot_type(scmd, dif);
539}
540
c98a0eb0
MP		 541static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
542{
543 struct request_queue *q = sdkp->disk->queue;
544 unsigned int logical_block_size = sdkp->device->sector_size;
545 unsigned int max_blocks = 0;
546
547 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 548 q->limits.discard_alignment = sdkp->unmap_alignment *
549 logical_block_size;
c98a0eb0
MP		 550 q->limits.discard_granularity =
551 max(sdkp->physical_block_size,
552 sdkp->unmap_granularity * logical_block_size);
553
89730393
MP		 554 sdkp->provisioning_mode = mode;
555
c98a0eb0
MP		 556 switch (mode) {
557
558 case SD_LBP_DISABLE:
559 q->limits.max_discard_sectors = 0;
560 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
561 return;
562
563 case SD_LBP_UNMAP:
564 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
565 break;
566
567 case SD_LBP_WS16:
568 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
569 break;
570
571 case SD_LBP_WS10:
572 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
573 break;
574
575 case SD_LBP_ZERO:
576 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
577 q->limits.discard_zeroes_data = 1;
578 break;
579 }
580
581 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
582 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 583}
584
e339c1a7 585/**
66ac0280
CH		 586 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
587 * @sdp: scsi device to operate one
e339c1a7
MP		 588 * @rq: Request to prepare
589 *
590 * Will issue either UNMAP or WRITE SAME(16) depending on preference
591 * indicated by target device.
592 **/
66ac0280 593static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 594{
595 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
596 struct bio *bio = rq->bio;
597 sector_t sector = bio->bi_sector;
66ac0280
CH		 598 unsigned int nr_sectors = bio_sectors(bio);
599 unsigned int len;
f1126e95 600 int ret;
c98a0eb0 601 char *buf;
66ac0280 602 struct page *page;
e339c1a7
MP		 603
604 if (sdkp->device->sector_size == 4096) {
605 sector >>= 3;
66ac0280 606 nr_sectors >>= 3;
e339c1a7
MP		 607 }
608
e339c1a7
MP		 609 rq->timeout = SD_TIMEOUT;
610
611 memset(rq->cmd, 0, rq->cmd_len);
612
66ac0280
CH		 613 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
614 if (!page)
615 return BLKPREP_DEFER;
616
c98a0eb0
MP		 617 switch (sdkp->provisioning_mode) {
618 case SD_LBP_UNMAP:
619 buf = page_address(page);
e339c1a7 620
66ac0280 621 rq->cmd_len = 10;
e339c1a7
MP		 622 rq->cmd[0] = UNMAP;
623 rq->cmd[8] = 24;
e339c1a7
MP		 624
625 put_unaligned_be16(6 + 16, &buf[0]);
626 put_unaligned_be16(16, &buf[2]);
627 put_unaligned_be64(sector, &buf[8]);
66ac0280 628 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 629
66ac0280 630 len = 24;
c98a0eb0
MP		 631 break;
632
633 case SD_LBP_WS16:
66ac0280 634 rq->cmd_len = 16;
e339c1a7
MP		 635 rq->cmd[0] = WRITE_SAME_16;
636 rq->cmd[1] = 0x8; /* UNMAP */
637 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 638 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
639
640 len = sdkp->device->sector_size;
c98a0eb0
MP		 641 break;
642
643 case SD_LBP_WS10:
644 case SD_LBP_ZERO:
645 rq->cmd_len = 10;
646 rq->cmd[0] = WRITE_SAME;
647 if (sdkp->provisioning_mode == SD_LBP_WS10)
648 rq->cmd[1] = 0x8; /* UNMAP */
649 put_unaligned_be32(sector, &rq->cmd[2]);
650 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
651
652 len = sdkp->device->sector_size;
653 break;
654
655 default:
09b9cc44 656 ret = BLKPREP_KILL;
c98a0eb0 657 goto out;
e339c1a7
MP		 658 }
659
66ac0280 660 blk_add_request_payload(rq, page, len);
f1126e95
FT		 661 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
662 rq->buffer = page_address(page);
c98a0eb0
MP		 663
664out:
610a6349
FT		 665 if (ret != BLKPREP_OK) {
666 __free_page(page);
667 rq->buffer = NULL;
668 }
f1126e95
FT		 669 return ret;
670}
671
90467c29
FT		 672static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
673{
e3b3e624 674 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 675 rq->retries = SD_MAX_RETRIES;
676 rq->cmd[0] = SYNCHRONIZE_CACHE;
677 rq->cmd_len = 10;
678
679 return scsi_setup_blk_pc_cmnd(sdp, rq);
680}
681
f1126e95
FT		 682static void sd_unprep_fn(struct request_queue *q, struct request *rq)
683{
610a6349
FT		 684 if (rq->cmd_flags & REQ_DISCARD) {
685 free_page((unsigned long)rq->buffer);
686 rq->buffer = NULL;
687 }
e339c1a7
MP		 688}
689
1da177e4 690/**
2db93ce8 691 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 692 * information in the request structure.
693 * @SCpnt: pointer to mid-level's per scsi command structure that
694 * contains request and into which the scsi command is written
695 *
696 * Returns 1 if successful and 0 if error (or cannot be done now).
697 **/
7f9a6bc4 698static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 699{
7f9a6bc4
JB		 700 struct scsi_cmnd *SCpnt;
701 struct scsi_device *sdp = q->queuedata;
776b23a0 702 struct gendisk *disk = rq->rq_disk;
af55ff67 703 struct scsi_disk *sdkp;
83096ebf 704 sector_t block = blk_rq_pos(rq);
18351070 705 sector_t threshold;
83096ebf 706 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 707 int ret, host_dif;
4e7392ec 708 unsigned char protect;
7f9a6bc4 709
e339c1a7
MP		 710 /*
711 * Discard request come in as REQ_TYPE_FS but we turn them into
712 * block PC requests to make life easier.
713 */
66ac0280
CH		 714 if (rq->cmd_flags & REQ_DISCARD) {
715 ret = scsi_setup_discard_cmnd(sdp, rq);
716 goto out;
90467c29
FT		 717 } else if (rq->cmd_flags & REQ_FLUSH) {
718 ret = scsi_setup_flush_cmnd(sdp, rq);
719 goto out;
66ac0280 720 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 721 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
722 goto out;
723 } else if (rq->cmd_type != REQ_TYPE_FS) {
724 ret = BLKPREP_KILL;
725 goto out;
726 }
727 ret = scsi_setup_fs_cmnd(sdp, rq);
728 if (ret != BLKPREP_OK)
729 goto out;
730 SCpnt = rq->special;
af55ff67 731 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 732
733 /* from here on until we're complete, any goto out
734 * is used for a killable error condition */
735 ret = BLKPREP_KILL;
1da177e4 736
fa0d34be 737 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 738 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 739 "count=%d\n",
740 (unsigned long long)block,
741 this_count));
1da177e4
LT		 742
743 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 744 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 745 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 746 "Finishing %u sectors\n",
747 blk_rq_sectors(rq)));
fa0d34be
MP		 748 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
749 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 750 goto out;
1da177e4
LT		 751 }
752
753 if (sdp->changed) {
754 /*
755 * quietly refuse to do anything to a changed disc until
756 * the changed bit has been reset
757 */
3ff5588d 758 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 759 goto out;
1da177e4 760 }
7f9a6bc4 761
a0899d4d 762 /*
18351070
LT		 763 * Some SD card readers can't handle multi-sector accesses which touch
764 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 765 */
18351070
LT		 766 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
767 (sdp->sector_size / 512);
768
769 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
770 if (block < threshold) {
771 /* Access up to the threshold but not beyond */
772 this_count = threshold - block;
773 } else {
774 /* Access only a single hardware sector */
775 this_count = sdp->sector_size / 512;
776 }
777 }
a0899d4d 778
fa0d34be
MP		 779 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
780 (unsigned long long)block));
1da177e4
LT		 781
782 /*
783 * If we have a 1K hardware sectorsize, prevent access to single
784 * 512 byte sectors. In theory we could handle this - in fact
785 * the scsi cdrom driver must be able to handle this because
786 * we typically use 1K blocksizes, and cdroms typically have
787 * 2K hardware sectorsizes. Of course, things are simpler
788 * with the cdrom, since it is read-only. For performance
789 * reasons, the filesystems should be able to handle this
790 * and not force the scsi disk driver to use bounce buffers
791 * for this.
792 */
793 if (sdp->sector_size == 1024) {
83096ebf 794 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 795 scmd_printk(KERN_ERR, SCpnt,
796 "Bad block number requested\n");
7f9a6bc4 797 goto out;
1da177e4
LT		 798 } else {
799 block = block >> 1;
800 this_count = this_count >> 1;
801 }
802 }
803 if (sdp->sector_size == 2048) {
83096ebf 804 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 805 scmd_printk(KERN_ERR, SCpnt,
806 "Bad block number requested\n");
7f9a6bc4 807 goto out;
1da177e4
LT		 808 } else {
809 block = block >> 2;
810 this_count = this_count >> 2;
811 }
812 }
813 if (sdp->sector_size == 4096) {
83096ebf 814 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 815 scmd_printk(KERN_ERR, SCpnt,
816 "Bad block number requested\n");
7f9a6bc4 817 goto out;
1da177e4
LT		 818 } else {
819 block = block >> 3;
820 this_count = this_count >> 3;
821 }
822 }
823 if (rq_data_dir(rq) == WRITE) {
824 if (!sdp->writeable) {
7f9a6bc4 825 goto out;
1da177e4
LT		 826 }
827 SCpnt->cmnd[0] = WRITE_6;
828 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 829
8c579ab6
MP		 830 if (blk_integrity_rq(rq))
831 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 832
1da177e4
LT		 833 } else if (rq_data_dir(rq) == READ) {
834 SCpnt->cmnd[0] = READ_6;
835 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
836 } else {
e73aec82 837 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 838 goto out;
1da177e4
LT		 839 }
840
fa0d34be 841 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 842 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 843 (rq_data_dir(rq) == WRITE) ?
844 "writing" : "reading", this_count,
83096ebf 845 blk_rq_sectors(rq)));
1da177e4 846
af55ff67 847 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 848 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
849 if (host_dif)
4e7392ec 850 protect = 1 << 5;
af55ff67 851 else
4e7392ec
MP		 852 protect = 0;
853
854 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
855 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
856
857 if (unlikely(SCpnt->cmnd == NULL)) {
858 ret = BLKPREP_DEFER;
859 goto out;
860 }
af55ff67 861
4e7392ec
MP		 862 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
863 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
864 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
865 SCpnt->cmnd[7] = 0x18;
866 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 867 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 868
869 /* LBA */
870 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
871 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
872 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
873 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
874 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
875 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
876 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
877 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
878
879 /* Expected Indirect LBA */
880 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
881 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
882 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
883 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
884
885 /* Transfer length */
886 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
887 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
888 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
889 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
890 } else if (block > 0xffffffff) {
1da177e4 891 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 892 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 893 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
894 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
895 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
896 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
897 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
898 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
899 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
900 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
901 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
902 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
903 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
904 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
905 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
906 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 907 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 908 SCpnt->device->use_10_for_rw) {
909 if (this_count > 0xffff)
910 this_count = 0xffff;
911
912 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 913 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 914 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
915 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
916 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
917 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
918 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
919 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
920 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
921 } else {
33659ebb 922 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 923 /*
924 * This happens only if this drive failed
925 * 10byte rw command with ILLEGAL_REQUEST
926 * during operation and thus turned off
927 * use_10_for_rw.
928 */
e73aec82
MP		 929 scmd_printk(KERN_ERR, SCpnt,
930 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 931 goto out;
007365ad
TH		 932 }
933
1da177e4
LT		 934 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
935 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
936 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
937 SCpnt->cmnd[4] = (unsigned char) this_count;
938 SCpnt->cmnd[5] = 0;
939 }
30b0c37b 940 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 941
af55ff67 942 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 943 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 944 sd_prot_op(SCpnt, host_dif);
af55ff67 945
1da177e4
LT		 946 /*
947 * We shouldn't disconnect in the middle of a sector, so with a dumb
948 * host adapter, it's safe to assume that we can at least transfer
949 * this many bytes between each connect / disconnect.
950 */
951 SCpnt->transfersize = sdp->sector_size;
952 SCpnt->underflow = this_count << 9;
953 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 954
1da177e4
LT		 955 /*
956 * This indicates that the command is ready from our end to be
957 * queued.
958 */
7f9a6bc4
JB		 959 ret = BLKPREP_OK;
960 out:
961 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 962}
963
964/**
965 * sd_open - open a scsi disk device
966 * @inode: only i_rdev member may be used
967 * @filp: only f_mode and f_flags may be used
968 *
969 * Returns 0 if successful. Returns a negated errno value in case
970 * of error.
971 *
972 * Note: This can be called from a user context (e.g. fsck(1) )
973 * or from within the kernel (e.g. as a result of a mount(1) ).
974 * In the latter case @inode and @filp carry an abridged amount
975 * of information as noted above.
409f3499
AB		 976 *
977 * Locking: called with bdev->bd_mutex held.
1da177e4 978 **/
0338e291 979static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 980{
0338e291 981 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 982 struct scsi_device *sdev;
983 int retval;
984
0338e291 985 if (!sdkp)
1da177e4
LT		 986 return -ENXIO;
987
fa0d34be 988 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 989
990 sdev = sdkp->device;
991
478a8a05
AS		 992 retval = scsi_autopm_get_device(sdev);
993 if (retval)
994 goto error_autopm;
995
1da177e4
LT		 996 /*
997 * If the device is in error recovery, wait until it is done.
998 * If the device is offline, then disallow any access to it.
999 */
1000 retval = -ENXIO;
1001 if (!scsi_block_when_processing_errors(sdev))
1002 goto error_out;
1003
1004 if (sdev->removable || sdkp->write_prot)
0338e291 1005 check_disk_change(bdev);
1da177e4
LT		 1006
1007 /*
1008 * If the drive is empty, just let the open fail.
1009 */
1010 retval = -ENOMEDIUM;
0338e291 1011 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1012 goto error_out;
1013
1014 /*
1015 * If the device has the write protect tab set, have the open fail
1016 * if the user expects to be able to write to the thing.
1017 */
1018 retval = -EROFS;
0338e291 1019 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1020 goto error_out;
1021
1022 /*
1023 * It is possible that the disk changing stuff resulted in
1024 * the device being taken offline. If this is the case,
1025 * report this to the user, and don't pretend that the
1026 * open actually succeeded.
1027 */
1028 retval = -ENXIO;
1029 if (!scsi_device_online(sdev))
1030 goto error_out;
1031
409f3499 1032 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1033 if (scsi_block_when_processing_errors(sdev))
1034 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1035 }
1036
1037 return 0;
1038
1039error_out:
478a8a05
AS		 1040 scsi_autopm_put_device(sdev);
1041error_autopm:
1da177e4
LT		 1042 scsi_disk_put(sdkp);
1043 return retval;
1044}
1045
1046/**
1047 * sd_release - invoked when the (last) close(2) is called on this
1048 * scsi disk.
1049 * @inode: only i_rdev member may be used
1050 * @filp: only f_mode and f_flags may be used
1051 *
1052 * Returns 0.
1053 *
1054 * Note: may block (uninterruptible) if error recovery is underway
1055 * on this disk.
409f3499
AB		 1056 *
1057 * Locking: called with bdev->bd_mutex held.
1da177e4 1058 **/
0338e291 1059static int sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1060{
1da177e4
LT		 1061 struct scsi_disk *sdkp = scsi_disk(disk);
1062 struct scsi_device *sdev = sdkp->device;
1063
56937f7b 1064 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1065
7e443312 1066 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1067 if (scsi_block_when_processing_errors(sdev))
1068 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1069 }
1070
1071 /*
1072 * XXX and what if there are packets in flight and this close()
1073 * XXX is followed by a "rmmod sd_mod"?
1074 */
478a8a05
AS		 1075
1076 scsi_autopm_put_device(sdev);
1da177e4
LT		 1077 scsi_disk_put(sdkp);
1078 return 0;
1079}
1080
a885c8c4 1081static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1082{
1083 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1084 struct scsi_device *sdp = sdkp->device;
1085 struct Scsi_Host *host = sdp->host;
1086 int diskinfo[4];
1087
1088 /* default to most commonly used values */
1089 diskinfo[0] = 0x40; /* 1 << 6 */
1090 diskinfo[1] = 0x20; /* 1 << 5 */
1091 diskinfo[2] = sdkp->capacity >> 11;
1092
1093 /* override with calculated, extended default, or driver values */
1094 if (host->hostt->bios_param)
1095 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1096 else
1097 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1098
a885c8c4
CH		 1099 geo->heads = diskinfo[0];
1100 geo->sectors = diskinfo[1];
1101 geo->cylinders = diskinfo[2];
1da177e4
LT		 1102 return 0;
1103}
1104
1105/**
1106 * sd_ioctl - process an ioctl
1107 * @inode: only i_rdev/i_bdev members may be used
1108 * @filp: only f_mode and f_flags may be used
1109 * @cmd: ioctl command number
1110 * @arg: this is third argument given to ioctl(2) system call.
1111 * Often contains a pointer.
1112 *
25985edc 1113 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1114 * success as well). Returns a negated errno value in case of error.
1115 *
1116 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1117 * down in the scsi subsystem.
1da177e4 1118 **/
0338e291 1119static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1120 unsigned int cmd, unsigned long arg)
1121{
1da177e4 1122 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1123 struct scsi_disk *sdkp = scsi_disk(disk);
1124 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1125 void __user *p = (void __user *)arg;
1126 int error;
1127
fe2d1851
NN		 1128 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1129 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1130
0bfc96cb
PB		 1131 error = scsi_verify_blk_ioctl(bdev, cmd);
1132 if (error < 0)
1133 return error;
1134
1da177e4
LT		 1135 /*
1136 * If we are in the middle of error recovery, don't let anyone
1137 * else try and use this device. Also, if error recovery fails, it
1138 * may try and take the device offline, in which case all further
1139 * access to the device is prohibited.
1140 */
83ff6fe8 1141 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1142 (mode & FMODE_NDELAY) != 0);
1da177e4 1143 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1144 goto out;
1da177e4 1145
1da177e4
LT		 1146 /*
1147 * Send SCSI addressing ioctls directly to mid level, send other
1148 * ioctls to block level and then onto mid level if they can't be
1149 * resolved.
1150 */
1151 switch (cmd) {
1152 case SCSI_IOCTL_GET_IDLUN:
1153 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1154 error = scsi_ioctl(sdp, cmd, p);
1155 break;
1da177e4 1156 default:
577ebb37 1157 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1158 if (error != -ENOTTY)
8a6cfeb6
AB		 1159 break;
1160 error = scsi_ioctl(sdp, cmd, p);
1161 break;
1da177e4 1162 }
8a6cfeb6 1163out:
8a6cfeb6 1164 return error;
1da177e4
LT		 1165}
1166
1167static void set_media_not_present(struct scsi_disk *sdkp)
1168{
2bae0093
TH		 1169 if (sdkp->media_present)
1170 sdkp->device->changed = 1;
1171
1172 if (sdkp->device->removable) {
1173 sdkp->media_present = 0;
1174 sdkp->capacity = 0;
1175 }
1176}
1177
1178static int media_not_present(struct scsi_disk *sdkp,
1179 struct scsi_sense_hdr *sshdr)
1180{
1181 if (!scsi_sense_valid(sshdr))
1182 return 0;
1183
1184 /* not invoked for commands that could return deferred errors */
1185 switch (sshdr->sense_key) {
1186 case UNIT_ATTENTION:
1187 case NOT_READY:
1188 /* medium not present */
1189 if (sshdr->asc == 0x3A) {
1190 set_media_not_present(sdkp);
1191 return 1;
1192 }
1193 }
1194 return 0;
1da177e4
LT		 1195}
1196
1197/**
2bae0093
TH		 1198 * sd_check_events - check media events
1199 * @disk: kernel device descriptor
1200 * @clearing: disk events currently being cleared
1da177e4 1201 *
2bae0093 1202 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1203 *
1204 * Note: this function is invoked from the block subsystem.
1205 **/
2bae0093 1206static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1207{
1208 struct scsi_disk *sdkp = scsi_disk(disk);
1209 struct scsi_device *sdp = sdkp->device;
001aac25 1210 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1211 int retval;
1212
2bae0093 1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1214
1215 /*
1216 * If the device is offline, don't send any commands - just pretend as
1217 * if the command failed. If the device ever comes back online, we
1218 * can deal with it then. It is only because of unrecoverable errors
1219 * that we would ever take a device offline in the first place.
1220 */
285e9670
KS		 1221 if (!scsi_device_online(sdp)) {
1222 set_media_not_present(sdkp);
285e9670
KS		 1223 goto out;
1224 }
1da177e4
LT		 1225
1226 /*
1227 * Using TEST_UNIT_READY enables differentiation between drive with
1228 * no cartridge loaded - NOT READY, drive with changed cartridge -
1229 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1230 *
1231 * Drives that auto spin down. eg iomega jaz 1G, will be started
1232 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1233 * sd_revalidate() is called.
1234 */
1235 retval = -ENODEV;
285e9670 1236
001aac25 1237 if (scsi_block_when_processing_errors(sdp)) {
4e2247b2
LT		 1238 retval = scsi_autopm_get_device(sdp);
1239 if (retval)
1240 goto out;
1241
001aac25
JB		 1242 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1243 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1244 sshdr);
4e2247b2 1245 scsi_autopm_put_device(sdp);
001aac25 1246 }
1da177e4 1247
2bae0093
TH		 1248 /* failed to execute TUR, assume media not present */
1249 if (host_byte(retval)) {
285e9670 1250 set_media_not_present(sdkp);
285e9670
KS		 1251 goto out;
1252 }
1da177e4 1253
2bae0093
TH		 1254 if (media_not_present(sdkp, sshdr))
1255 goto out;
1256
1da177e4
LT		 1257 /*
1258 * For removable scsi disk we have to recognise the presence
2bae0093 1259 * of a disk in the drive.
1da177e4 1260 */
2bae0093
TH		 1261 if (!sdkp->media_present)
1262 sdp->changed = 1;
1da177e4 1263 sdkp->media_present = 1;
285e9670 1264out:
3ff5588d 1265 /*
2bae0093 1266 * sdp->changed is set under the following conditions:
3ff5588d 1267 *
2bae0093
TH		 1268 * Medium present state has changed in either direction.
1269 * Device has indicated UNIT_ATTENTION.
3ff5588d 1270 */
001aac25 1271 kfree(sshdr);
2bae0093
TH		 1272 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1273 sdp->changed = 0;
1da177e4 1274 return retval;
1da177e4
LT		 1275}
1276
e73aec82 1277static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1278{
1da177e4 1279 int retries, res;
e73aec82 1280 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1281 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1282
1283 if (!scsi_device_online(sdp))
1284 return -ENODEV;
1285
1da177e4 1286
1da177e4
LT		 1287 for (retries = 3; retries > 0; --retries) {
1288 unsigned char cmd[10] = { 0 };
1289
1290 cmd[0] = SYNCHRONIZE_CACHE;
1291 /*
1292 * Leave the rest of the command zero to indicate
1293 * flush everything.
1294 */
ea73a9f2 1295 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e3b3e624 1296 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
ea73a9f2 1297 if (res == 0)
1da177e4
LT		 1298 break;
1299 }
1300
e73aec82
MP		 1301 if (res) {
1302 sd_print_result(sdkp, res);
1303 if (driver_byte(res) & DRIVER_SENSE)
1304 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1305 }
1306
3721050a
TH		 1307 if (res)
1308 return -EIO;
1309 return 0;
1da177e4
LT		 1310}
1311
1da177e4
LT		 1312static void sd_rescan(struct device *dev)
1313{
39b7f1e2
AS		 1314 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1315
1316 if (sdkp) {
f98a8cae 1317 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1318 scsi_disk_put(sdkp);
1319 }
1da177e4
LT		 1320}
1321
1322
1323#ifdef CONFIG_COMPAT
1324/*
1325 * This gets directly called from VFS. When the ioctl
1326 * is not recognized we go back to the other translation paths.
1327 */
0338e291
AV		 1328static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1329 unsigned int cmd, unsigned long arg)
1da177e4 1330{
0338e291 1331 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1332 int ret;
1333
1334 ret = scsi_verify_blk_ioctl(bdev, cmd);
1335 if (ret < 0)
1336 return ret;
1da177e4
LT		 1337
1338 /*
1339 * If we are in the middle of error recovery, don't let anyone
1340 * else try and use this device. Also, if error recovery fails, it
1341 * may try and take the device offline, in which case all further
1342 * access to the device is prohibited.
1343 */
1344 if (!scsi_block_when_processing_errors(sdev))
1345 return -ENODEV;
1346
1347 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1348 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1349
1350 return ret;
1351 }
1352
1353 /*
1354 * Let the static ioctl translation table take care of it.
1355 */
1356 return -ENOIOCTLCMD;
1357}
1358#endif
1359
83d5cde4 1360static const struct block_device_operations sd_fops = {
1da177e4 1361 .owner = THIS_MODULE,
0338e291
AV		 1362 .open = sd_open,
1363 .release = sd_release,
8a6cfeb6 1364 .ioctl = sd_ioctl,
a885c8c4 1365 .getgeo = sd_getgeo,
1da177e4 1366#ifdef CONFIG_COMPAT
0338e291 1367 .compat_ioctl = sd_compat_ioctl,
1da177e4 1368#endif
2bae0093 1369 .check_events = sd_check_events,
1da177e4 1370 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1371 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1372};
1373
18a4d0a2
MP		 1374/**
1375 * sd_eh_action - error handling callback
1376 * @scmd: sd-issued command that has failed
1377 * @eh_cmnd: The command that was sent during error handling
1378 * @eh_cmnd_len: Length of eh_cmnd in bytes
1379 * @eh_disp: The recovery disposition suggested by the midlayer
1380 *
1381 * This function is called by the SCSI midlayer upon completion of
1382 * an error handling command (TEST UNIT READY, START STOP UNIT,
1383 * etc.) The command sent to the device by the error handler is
1384 * stored in eh_cmnd. The result of sending the eh command is
1385 * passed in eh_disp.
1386 **/
1387static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1388 int eh_cmnd_len, int eh_disp)
1389{
1390 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1391
1392 if (!scsi_device_online(scmd->device) ||
1393 !scsi_medium_access_command(scmd))
1394 return eh_disp;
1395
1396 /*
1397 * The device has timed out executing a medium access command.
1398 * However, the TEST UNIT READY command sent during error
1399 * handling completed successfully. Either the device is in the
1400 * process of recovering or has it suffered an internal failure
1401 * that prevents access to the storage medium.
1402 */
1403 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1404 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1405 sdkp->medium_access_timed_out++;
1406
1407 /*
1408 * If the device keeps failing read/write commands but TEST UNIT
1409 * READY always completes successfully we assume that medium
1410 * access is no longer possible and take the device offline.
1411 */
1412 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1413 scmd_printk(KERN_ERR, scmd,
1414 "Medium access timeout failure. Offlining disk!\n");
1415 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1416
1417 return FAILED;
1418 }
1419
1420 return eh_disp;
1421}
1422
af55ff67
MP		 1423static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1424{
83096ebf
TH		 1425 u64 start_lba = blk_rq_pos(scmd->request);
1426 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1427 u64 bad_lba;
1428 int info_valid;
a8733c7b
JB		 1429 /*
1430 * resid is optional but mostly filled in. When it's unused,
1431 * its value is zero, so we assume the whole buffer transferred
1432 */
1433 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1434 unsigned int good_bytes;
af55ff67 1435
33659ebb 1436 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1437 return 0;
1438
1439 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1440 SCSI_SENSE_BUFFERSIZE,
1441 &bad_lba);
1442 if (!info_valid)
1443 return 0;
1444
1445 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1446 return 0;
1447
1448 if (scmd->device->sector_size < 512) {
1449 /* only legitimate sector_size here is 256 */
1450 start_lba <<= 1;
1451 end_lba <<= 1;
1452 } else {
1453 /* be careful ... don't want any overflows */
1454 u64 factor = scmd->device->sector_size / 512;
1455 do_div(start_lba, factor);
1456 do_div(end_lba, factor);
1457 }
1458
1459 /* The bad lba was reported incorrectly, we have no idea where
1460 * the error is.
1461 */
1462 if (bad_lba < start_lba || bad_lba >= end_lba)
1463 return 0;
1464
1465 /* This computation should always be done in terms of
1466 * the resolution of the device's medium.
1467 */
a8733c7b
JB		 1468 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1469 return min(good_bytes, transferred);
af55ff67
MP		 1470}
1471
1da177e4 1472/**
7b3d9545 1473 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1474 * driver has completed (successfully or otherwise) a scsi command.
1475 * @SCpnt: mid-level's per command structure.
1476 *
1477 * Note: potentially run from within an ISR. Must not block.
1478 **/
7b3d9545 1479static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1480{
1481 int result = SCpnt->result;
af55ff67 1482 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1483 struct scsi_sense_hdr sshdr;
4e7392ec 1484 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1da177e4
LT		 1485 int sense_valid = 0;
1486 int sense_deferred = 0;
c98a0eb0 1487 unsigned char op = SCpnt->cmnd[0];
1da177e4 1488
c98a0eb0
MP		 1489 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1490 scsi_set_resid(SCpnt, 0);
6a32a8ae 1491
1da177e4
LT		 1492 if (result) {
1493 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1494 if (sense_valid)
1495 sense_deferred = scsi_sense_is_deferred(&sshdr);
1496 }
1da177e4 1497#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1498 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1499 if (sense_valid) {
fa0d34be 1500 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1501 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1502 "ascq]=%x,%x,%x,%x\n",
1503 sshdr.response_code,
1504 sshdr.sense_key, sshdr.asc,
1505 sshdr.ascq));
1da177e4
LT		 1506 }
1507#endif
03aba2f7
LT		 1508 if (driver_byte(result) != DRIVER_SENSE &&
1509 (!sense_valid || sense_deferred))
1510 goto out;
1511
18a4d0a2
MP		 1512 sdkp->medium_access_timed_out = 0;
1513
03aba2f7
LT		 1514 switch (sshdr.sense_key) {
1515 case HARDWARE_ERROR:
1516 case MEDIUM_ERROR:
af55ff67 1517 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1518 break;
1519 case RECOVERED_ERROR:
af55ff67
MP		 1520 good_bytes = scsi_bufflen(SCpnt);
1521 break;
10dab226
JW		 1522 case NO_SENSE:
1523 /* This indicates a false check condition, so ignore it. An
1524 * unknown amount of data was transferred so treat it as an
1525 * error.
1526 */
1527 scsi_print_sense("sd", SCpnt);
1528 SCpnt->result = 0;
1529 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1530 break;
c98a0eb0
MP		 1531 case ABORTED_COMMAND:
1532 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1533 good_bytes = sd_completed_bytes(SCpnt);
1534 break;
1535 case ILLEGAL_REQUEST:
1536 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1537 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0
MP		 1538 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1539 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1540 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1541 sd_config_discard(sdkp, SD_LBP_DISABLE);
03aba2f7
LT		 1542 break;
1543 default:
1544 break;
1da177e4 1545 }
03aba2f7 1546 out:
af55ff67
MP		 1547 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1548 sd_dif_complete(SCpnt, good_bytes);
1549
4e7392ec 1550 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1551 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1552
1553 /* We have to print a failed command here as the
1554 * extended CDB gets freed before scsi_io_completion()
1555 * is called.
1556 */
1557 if (result)
1558 scsi_print_command(SCpnt);
1559
4e7392ec 1560 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1561 SCpnt->cmnd = NULL;
1562 SCpnt->cmd_len = 0;
1563 }
4e7392ec 1564
7b3d9545 1565 return good_bytes;
1da177e4
LT		 1566}
1567
1da177e4
LT		 1568/*
1569 * spinup disk - called only in sd_revalidate_disk()
1570 */
1571static void
e73aec82 1572sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1573{
1da177e4 1574 unsigned char cmd[10];
4451e472 1575 unsigned long spintime_expire = 0;
1da177e4
LT		 1576 int retries, spintime;
1577 unsigned int the_result;
1578 struct scsi_sense_hdr sshdr;
1579 int sense_valid = 0;
1580
1581 spintime = 0;
1582
1583 /* Spin up drives, as required. Only do this at boot time */
1584 /* Spinup needs to be done for module loads too. */
1585 do {
1586 retries = 0;
1587
1588 do {
1589 cmd[0] = TEST_UNIT_READY;
1590 memset((void *) &cmd[1], 0, 9);
1591
ea73a9f2
JB		 1592 the_result = scsi_execute_req(sdkp->device, cmd,
1593 DMA_NONE, NULL, 0,
1594 &sshdr, SD_TIMEOUT,
f4f4e47e 1595 SD_MAX_RETRIES, NULL);
1da177e4 1596
b4d38e38
AS		 1597 /*
1598 * If the drive has indicated to us that it
1599 * doesn't have any media in it, don't bother
1600 * with any more polling.
1601 */
1602 if (media_not_present(sdkp, &sshdr))
1603 return;
1604
1da177e4 1605 if (the_result)
ea73a9f2 1606 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1607 retries++;
1608 } while (retries < 3 &&
1609 (!scsi_status_is_good(the_result) ||
1610 ((driver_byte(the_result) & DRIVER_SENSE) &&
1611 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1612
1da177e4
LT		 1613 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1614 /* no sense, TUR either succeeded or failed
1615 * with a status error */
e73aec82
MP		 1616 if(!spintime && !scsi_status_is_good(the_result)) {
1617 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1618 sd_print_result(sdkp, the_result);
1619 }
1da177e4
LT		 1620 break;
1621 }
1622
1623 /*
1624 * The device does not want the automatic start to be issued.
1625 */
33dd6f92 1626 if (sdkp->device->no_start_on_add)
1da177e4 1627 break;
1da177e4 1628
33dd6f92
MW		 1629 if (sense_valid && sshdr.sense_key == NOT_READY) {
1630 if (sshdr.asc == 4 && sshdr.ascq == 3)
1631 break; /* manual intervention required */
1632 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1633 break; /* standby */
1634 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1635 break; /* unavailable */
1636 /*
1637 * Issue command to spin up drive when not ready
1638 */
1da177e4 1639 if (!spintime) {
e73aec82 1640 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1641 cmd[0] = START_STOP;
1642 cmd[1] = 1; /* Return immediately */
1643 memset((void *) &cmd[2], 0, 8);
1644 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1645 if (sdkp->device->start_stop_pwr_cond)
1646 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1647 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1648 NULL, 0, &sshdr,
f4f4e47e
FT		 1649 SD_TIMEOUT, SD_MAX_RETRIES,
1650 NULL);
4451e472
AS		 1651 spintime_expire = jiffies + 100 * HZ;
1652 spintime = 1;
1da177e4 1653 }
1da177e4
LT		 1654 /* Wait 1 second for next try */
1655 msleep(1000);
1656 printk(".");
4451e472
AS		 1657
1658 /*
1659 * Wait for USB flash devices with slow firmware.
1660 * Yes, this sense key/ASC combination shouldn't
1661 * occur here. It's characteristic of these devices.
1662 */
1663 } else if (sense_valid &&
1664 sshdr.sense_key == UNIT_ATTENTION &&
1665 sshdr.asc == 0x28) {
1666 if (!spintime) {
1667 spintime_expire = jiffies + 5 * HZ;
1668 spintime = 1;
1669 }
1670 /* Wait 1 second for next try */
1671 msleep(1000);
1da177e4
LT		 1672 } else {
1673 /* we don't understand the sense code, so it's
1674 * probably pointless to loop */
1675 if(!spintime) {
e73aec82
MP		 1676 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1677 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1678 }
1679 break;
1680 }
1681
4451e472 1682 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1683
1684 if (spintime) {
1685 if (scsi_status_is_good(the_result))
1686 printk("ready\n");
1687 else
1688 printk("not responding...\n");
1689 }
1690}
1691
e0597d70
MP		 1692
1693/*
1694 * Determine whether disk supports Data Integrity Field.
1695 */
fe542396 1696static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1697{
1698 struct scsi_device *sdp = sdkp->device;
1699 u8 type;
fe542396 1700 int ret = 0;
e0597d70
MP		 1701
1702 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1703 return ret;
35e1a5d9
MP		 1704
1705 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1706
fe542396
MP		 1707 if (type > SD_DIF_TYPE3_PROTECTION)
1708 ret = -ENODEV;
1709 else if (scsi_host_dif_capable(sdp->host, type))
1710 ret = 1;
1711
1712 if (sdkp->first_scan || type != sdkp->protection_type)
1713 switch (ret) {
1714 case -ENODEV:
1715 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1716 " protection type %u. Disabling disk!\n",
1717 type);
1718 break;
1719 case 1:
1720 sd_printk(KERN_NOTICE, sdkp,
1721 "Enabling DIF Type %u protection\n", type);
1722 break;
1723 case 0:
1724 sd_printk(KERN_NOTICE, sdkp,
1725 "Disabling DIF Type %u protection\n", type);
1726 break;
1727 }
e0597d70 1728
be922f47
MP		 1729 sdkp->protection_type = type;
1730
fe542396 1731 return ret;
e0597d70
MP		 1732}
1733
0da205e0
MW		 1734static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1735 struct scsi_sense_hdr *sshdr, int sense_valid,
1736 int the_result)
1737{
1738 sd_print_result(sdkp, the_result);
1739 if (driver_byte(the_result) & DRIVER_SENSE)
1740 sd_print_sense_hdr(sdkp, sshdr);
1741 else
1742 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1743
1744 /*
1745 * Set dirty bit for removable devices if not ready -
1746 * sometimes drives will not report this properly.
1747 */
1748 if (sdp->removable &&
1749 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1750 set_media_not_present(sdkp);
0da205e0
MW		 1751
1752 /*
1753 * We used to set media_present to 0 here to indicate no media
1754 * in the drive, but some drives fail read capacity even with
1755 * media present, so we can't do that.
1756 */
1757 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1758}
1759
1760#define RC16_LEN 32
1761#if RC16_LEN > SD_BUF_SIZE
1762#error RC16_LEN must not be more than SD_BUF_SIZE
1763#endif
1764
3233ac19
JB		 1765#define READ_CAPACITY_RETRIES_ON_RESET 10
1766
0da205e0
MW		 1767static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1768 unsigned char *buffer)
ea73a9f2 1769{
1da177e4 1770 unsigned char cmd[16];
1da177e4
LT		 1771 struct scsi_sense_hdr sshdr;
1772 int sense_valid = 0;
0da205e0 1773 int the_result;
3233ac19 1774 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1775 unsigned int alignment;
0da205e0
MW		 1776 unsigned long long lba;
1777 unsigned sector_size;
1da177e4 1778
5ce524bd
HG		 1779 if (sdp->no_read_capacity_16)
1780 return -EINVAL;
1781
1da177e4 1782 do {
0da205e0
MW		 1783 memset(cmd, 0, 16);
1784 cmd[0] = SERVICE_ACTION_IN;
1785 cmd[1] = SAI_READ_CAPACITY_16;
1786 cmd[13] = RC16_LEN;
1787 memset(buffer, 0, RC16_LEN);
1788
ea73a9f2 1789 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1790 buffer, RC16_LEN, &sshdr,
1791 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1792
ea73a9f2 1793 if (media_not_present(sdkp, &sshdr))
0da205e0 1794 return -ENODEV;
1da177e4 1795
2b301307 1796 if (the_result) {
ea73a9f2 1797 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1798 if (sense_valid &&
1799 sshdr.sense_key == ILLEGAL_REQUEST &&
1800 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1801 sshdr.ascq == 0x00)
1802 /* Invalid Command Operation Code or
1803 * Invalid Field in CDB, just retry
1804 * silently with RC10 */
1805 return -EINVAL;
3233ac19
JB		 1806 if (sense_valid &&
1807 sshdr.sense_key == UNIT_ATTENTION &&
1808 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1809 /* Device reset might occur several times,
1810 * give it one more chance */
1811 if (--reset_retries > 0)
1812 continue;
2b301307 1813 }
1da177e4
LT		 1814 retries--;
1815
1816 } while (the_result && retries);
1817
0da205e0 1818 if (the_result) {
e73aec82 1819 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1820 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1821 return -EINVAL;
1822 }
e73aec82 1823
8f76d151
DH		 1824 sector_size = get_unaligned_be32(&buffer[8]);
1825 lba = get_unaligned_be64(&buffer[0]);
0da205e0 1826
fe542396
MP		 1827 if (sd_read_protection_type(sdkp, buffer) < 0) {
1828 sdkp->capacity = 0;
1829 return -ENODEV;
1830 }
0da205e0
MW		 1831
1832 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1833 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1834 "kernel compiled with support for large block "
1835 "devices.\n");
1836 sdkp->capacity = 0;
1837 return -EOVERFLOW;
1838 }
1839
ea09bcc9 1840 /* Logical blocks per physical block exponent */
526f7c79 1841 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1842
1843 /* Lowest aligned logical block */
1844 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1845 blk_queue_alignment_offset(sdp->request_queue, alignment);
1846 if (alignment && sdkp->first_scan)
1847 sd_printk(KERN_NOTICE, sdkp,
1848 "physical block alignment offset: %u\n", alignment);
1849
c98a0eb0
MP		 1850 if (buffer[14] & 0x80) { /* LBPME */
1851 sdkp->lbpme = 1;
e339c1a7 1852
c98a0eb0
MP		 1853 if (buffer[14] & 0x40) /* LBPRZ */
1854 sdkp->lbprz = 1;
e339c1a7 1855
c98a0eb0 1856 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 1857 }
1858
0da205e0
MW		 1859 sdkp->capacity = lba + 1;
1860 return sector_size;
1861}
1862
1863static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1864 unsigned char *buffer)
1865{
1866 unsigned char cmd[16];
1867 struct scsi_sense_hdr sshdr;
1868 int sense_valid = 0;
1869 int the_result;
3233ac19 1870 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 1871 sector_t lba;
1872 unsigned sector_size;
1873
1874 do {
1875 cmd[0] = READ_CAPACITY;
1876 memset(&cmd[1], 0, 9);
1877 memset(buffer, 0, 8);
1878
1879 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1880 buffer, 8, &sshdr,
1881 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1882
1883 if (media_not_present(sdkp, &sshdr))
1884 return -ENODEV;
1885
3233ac19 1886 if (the_result) {
0da205e0 1887 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 1888 if (sense_valid &&
1889 sshdr.sense_key == UNIT_ATTENTION &&
1890 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1891 /* Device reset might occur several times,
1892 * give it one more chance */
1893 if (--reset_retries > 0)
1894 continue;
1895 }
0da205e0
MW		 1896 retries--;
1897
1898 } while (the_result && retries);
1899
1900 if (the_result) {
1901 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1902 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1903 return -EINVAL;
1904 }
1905
8f76d151
DH		 1906 sector_size = get_unaligned_be32(&buffer[4]);
1907 lba = get_unaligned_be32(&buffer[0]);
0da205e0 1908
5ce524bd
HG		 1909 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1910 /* Some buggy (usb cardreader) devices return an lba of
1911 0xffffffff when the want to report a size of 0 (with
1912 which they really mean no media is present) */
1913 sdkp->capacity = 0;
5cc10350 1914 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 1915 return sector_size;
1916 }
1917
0da205e0
MW		 1918 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1919 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1920 "kernel compiled with support for large block "
1921 "devices.\n");
1922 sdkp->capacity = 0;
1923 return -EOVERFLOW;
1924 }
1925
1926 sdkp->capacity = lba + 1;
526f7c79 1927 sdkp->physical_block_size = sector_size;
0da205e0
MW		 1928 return sector_size;
1929}
1930
2b301307
MW		 1931static int sd_try_rc16_first(struct scsi_device *sdp)
1932{
f87146bb
HR		 1933 if (sdp->host->max_cmd_len < 16)
1934 return 0;
6a0bdffa
AS		 1935 if (sdp->try_rc_10_first)
1936 return 0;
2b301307
MW		 1937 if (sdp->scsi_level > SCSI_SPC_2)
1938 return 1;
1939 if (scsi_device_protection(sdp))
1940 return 1;
1941 return 0;
1942}
1943
0da205e0
MW		 1944/*
1945 * read disk capacity
1946 */
1947static void
1948sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1949{
1950 int sector_size;
1951 struct scsi_device *sdp = sdkp->device;
70a9b873 1952 sector_t old_capacity = sdkp->capacity;
0da205e0 1953
2b301307 1954 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 1955 sector_size = read_capacity_16(sdkp, sdp, buffer);
1956 if (sector_size == -EOVERFLOW)
1da177e4 1957 goto got_data;
2b301307
MW		 1958 if (sector_size == -ENODEV)
1959 return;
1960 if (sector_size < 0)
1961 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 1962 if (sector_size < 0)
1963 return;
1da177e4 1964 } else {
0da205e0
MW		 1965 sector_size = read_capacity_10(sdkp, sdp, buffer);
1966 if (sector_size == -EOVERFLOW)
1967 goto got_data;
1968 if (sector_size < 0)
1969 return;
1970 if ((sizeof(sdkp->capacity) > 4) &&
1971 (sdkp->capacity > 0xffffffffULL)) {
1972 int old_sector_size = sector_size;
1973 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1974 "Trying to use READ CAPACITY(16).\n");
1975 sector_size = read_capacity_16(sdkp, sdp, buffer);
1976 if (sector_size < 0) {
1977 sd_printk(KERN_NOTICE, sdkp,
1978 "Using 0xffffffff as device size\n");
1979 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1980 sector_size = old_sector_size;
1981 goto got_data;
1982 }
1983 }
1984 }
1da177e4 1985
5c211caa
AS		 1986 /* Some devices are known to return the total number of blocks,
1987 * not the highest block number. Some devices have versions
1988 * which do this and others which do not. Some devices we might
1989 * suspect of doing this but we don't know for certain.
1990 *
1991 * If we know the reported capacity is wrong, decrement it. If
1992 * we can only guess, then assume the number of blocks is even
1993 * (usually true but not always) and err on the side of lowering
1994 * the capacity.
1995 */
1996 if (sdp->fix_capacity ||
1997 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1998 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1999 "from its reported value: %llu\n",
2000 (unsigned long long) sdkp->capacity);
1da177e4 2001 --sdkp->capacity;
61bf54b7
ON		 2002 }
2003
1da177e4
LT		 2004got_data:
2005 if (sector_size == 0) {
2006 sector_size = 512;
e73aec82
MP		 2007 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2008 "assuming 512.\n");
1da177e4
LT		 2009 }
2010
2011 if (sector_size != 512 &&
2012 sector_size != 1024 &&
2013 sector_size != 2048 &&
2014 sector_size != 4096 &&
2015 sector_size != 256) {
e73aec82
MP		 2016 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2017 sector_size);
1da177e4
LT		 2018 /*
2019 * The user might want to re-format the drive with
2020 * a supported sectorsize. Once this happens, it
2021 * would be relatively trivial to set the thing up.
2022 * For this reason, we leave the thing in the table.
2023 */
2024 sdkp->capacity = 0;
2025 /*
2026 * set a bogus sector size so the normal read/write
2027 * logic in the block layer will eventually refuse any
2028 * request on this device without tripping over power
2029 * of two sector size assumptions
2030 */
2031 sector_size = 512;
2032 }
e1defc4f 2033 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2034
1da177e4 2035 {
7404ad3b 2036 char cap_str_2[10], cap_str_10[10];
520a2c27 2037 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2038
7404ad3b
JB		 2039 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2040 sizeof(cap_str_2));
2041 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2042 sizeof(cap_str_10));
1da177e4 2043
ea09bcc9 2044 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2045 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2046 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2047 (unsigned long long)sdkp->capacity,
2048 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2049
526f7c79 2050 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2051 sd_printk(KERN_NOTICE, sdkp,
2052 "%u-byte physical blocks\n",
526f7c79 2053 sdkp->physical_block_size);
ea09bcc9 2054 }
1da177e4
LT		 2055 }
2056
2057 /* Rescale capacity to 512-byte units */
2058 if (sector_size == 4096)
2059 sdkp->capacity <<= 3;
2060 else if (sector_size == 2048)
2061 sdkp->capacity <<= 2;
2062 else if (sector_size == 1024)
2063 sdkp->capacity <<= 1;
2064 else if (sector_size == 256)
2065 sdkp->capacity >>= 1;
2066
526f7c79
MP		 2067 blk_queue_physical_block_size(sdp->request_queue,
2068 sdkp->physical_block_size);
1da177e4
LT		 2069 sdkp->device->sector_size = sector_size;
2070}
2071
2072/* called with buffer of length 512 */
2073static inline int
ea73a9f2
JB		 2074sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2075 unsigned char *buffer, int len, struct scsi_mode_data *data,
2076 struct scsi_sense_hdr *sshdr)
1da177e4 2077{
ea73a9f2 2078 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2079 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2080 sshdr);
1da177e4
LT		 2081}
2082
2083/*
2084 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2085 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2086 */
2087static void
e73aec82 2088sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2089{
1da177e4 2090 int res;
ea73a9f2 2091 struct scsi_device *sdp = sdkp->device;
1da177e4 2092 struct scsi_mode_data data;
70a9b873 2093 int old_wp = sdkp->write_prot;
1da177e4
LT		 2094
2095 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2096 if (sdp->skip_ms_page_3f) {
e73aec82 2097 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2098 return;
2099 }
2100
ea73a9f2
JB		 2101 if (sdp->use_192_bytes_for_3f) {
2102 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2103 } else {
2104 /*
2105 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2106 * We have to start carefully: some devices hang if we ask
2107 * for more than is available.
2108 */
ea73a9f2 2109 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2110
2111 /*
2112 * Second attempt: ask for page 0 When only page 0 is
2113 * implemented, a request for page 3F may return Sense Key
2114 * 5: Illegal Request, Sense Code 24: Invalid field in
2115 * CDB.
2116 */
2117 if (!scsi_status_is_good(res))
ea73a9f2 2118 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2119
2120 /*
2121 * Third attempt: ask 255 bytes, as we did earlier.
2122 */
2123 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2124 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2125 &data, NULL);
1da177e4
LT		 2126 }
2127
2128 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2129 sd_printk(KERN_WARNING, sdkp,
2130 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2131 } else {
2132 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2133 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2134 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2135 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2136 sdkp->write_prot ? "on" : "off");
2137 sd_printk(KERN_DEBUG, sdkp,
2138 "Mode Sense: %02x %02x %02x %02x\n",
2139 buffer[0], buffer[1], buffer[2], buffer[3]);
2140 }
1da177e4
LT		 2141 }
2142}
2143
2144/*
2145 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2146 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2147 */
2148static void
e73aec82 2149sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2150{
1da177e4 2151 int len = 0, res;
ea73a9f2 2152 struct scsi_device *sdp = sdkp->device;
1da177e4 2153
631e8a13
AV		 2154 int dbd;
2155 int modepage;
0bcaa111 2156 int first_len;
1da177e4
LT		 2157 struct scsi_mode_data data;
2158 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2159 int old_wce = sdkp->WCE;
2160 int old_rcd = sdkp->RCD;
2161 int old_dpofua = sdkp->DPOFUA;
1da177e4 2162
0bcaa111
LT		 2163 first_len = 4;
2164 if (sdp->skip_ms_page_8) {
2165 if (sdp->type == TYPE_RBC)
2166 goto defaults;
2167 else {
2168 if (sdp->skip_ms_page_3f)
2169 goto defaults;
2170 modepage = 0x3F;
2171 if (sdp->use_192_bytes_for_3f)
2172 first_len = 192;
2173 dbd = 0;
2174 }
2175 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2176 modepage = 6;
2177 dbd = 8;
2178 } else {
2179 modepage = 8;
2180 dbd = 0;
2181 }
2182
1da177e4 2183 /* cautiously ask */
0bcaa111
LT		 2184 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2185 &data, &sshdr);
1da177e4
LT		 2186
2187 if (!scsi_status_is_good(res))
2188 goto bad_sense;
2189
6d73c851
AV		 2190 if (!data.header_length) {
2191 modepage = 6;
0bcaa111 2192 first_len = 0;
e73aec82 2193 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2194 }
2195
1da177e4
LT		 2196 /* that went OK, now ask for the proper length */
2197 len = data.length;
2198
2199 /*
2200 * We're only interested in the first three bytes, actually.
2201 * But the data cache page is defined for the first 20.
2202 */
2203 if (len < 3)
2204 goto bad_sense;
0bcaa111
LT		 2205 else if (len > SD_BUF_SIZE) {
2206 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2207 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2208 len = SD_BUF_SIZE;
2209 }
2210 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2211 len = 192;
1da177e4
LT		 2212
2213 /* Get the data */
0bcaa111
LT		 2214 if (len > first_len)
2215 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2216 &data, &sshdr);
1da177e4
LT		 2217
2218 if (scsi_status_is_good(res)) {
631e8a13 2219 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2220
0bcaa111
LT		 2221 while (offset < len) {
2222 u8 page_code = buffer[offset] & 0x3F;
2223 u8 spf = buffer[offset] & 0x40;
2224
2225 if (page_code == 8 || page_code == 6) {
2226 /* We're interested only in the first 3 bytes.
2227 */
2228 if (len - offset <= 2) {
2229 sd_printk(KERN_ERR, sdkp, "Incomplete "
2230 "mode parameter data\n");
2231 goto defaults;
2232 } else {
2233 modepage = page_code;
2234 goto Page_found;
2235 }
2236 } else {
2237 /* Go to the next page */
2238 if (spf && len - offset > 3)
2239 offset += 4 + (buffer[offset+2] << 8) +
2240 buffer[offset+3];
2241 else if (!spf && len - offset > 1)
2242 offset += 2 + buffer[offset+1];
2243 else {
2244 sd_printk(KERN_ERR, sdkp, "Incomplete "
2245 "mode parameter data\n");
2246 goto defaults;
2247 }
2248 }
48970800
AV		 2249 }
2250
0bcaa111
LT		 2251 if (modepage == 0x3F) {
2252 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2253 "present\n");
2254 goto defaults;
2255 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2256 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2257 goto defaults;
2258 }
0bcaa111 2259 Page_found:
631e8a13
AV		 2260 if (modepage == 8) {
2261 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2262 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2263 } else {
2264 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2265 sdkp->RCD = 0;
2266 }
1da177e4 2267
007365ad
TH		 2268 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2269 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2270 sd_printk(KERN_NOTICE, sdkp,
2271 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2272 sdkp->DPOFUA = 0;
2273 }
2274
70a9b873
MP		 2275 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2276 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2277 sd_printk(KERN_NOTICE, sdkp,
2278 "Write cache: %s, read cache: %s, %s\n",
2279 sdkp->WCE ? "enabled" : "disabled",
2280 sdkp->RCD ? "disabled" : "enabled",
2281 sdkp->DPOFUA ? "supports DPO and FUA"
2282 : "doesn't support DPO or FUA");
1da177e4
LT		 2283
2284 return;
2285 }
2286
2287bad_sense:
ea73a9f2 2288 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2289 sshdr.sense_key == ILLEGAL_REQUEST &&
2290 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2291 /* Invalid field in CDB */
2292 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2293 else
e73aec82 2294 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2295
2296defaults:
b81478d8
NJ		 2297 if (sdp->wce_default_on) {
2298 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2299 sdkp->WCE = 1;
2300 } else {
2301 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2302 sdkp->WCE = 0;
2303 }
1da177e4 2304 sdkp->RCD = 0;
48970800 2305 sdkp->DPOFUA = 0;
1da177e4
LT		 2306}
2307
e0597d70
MP		 2308/*
2309 * The ATO bit indicates whether the DIF application tag is available
2310 * for use by the operating system.
2311 */
439d77f7 2312static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2313{
2314 int res, offset;
2315 struct scsi_device *sdp = sdkp->device;
2316 struct scsi_mode_data data;
2317 struct scsi_sense_hdr sshdr;
2318
2319 if (sdp->type != TYPE_DISK)
2320 return;
2321
2322 if (sdkp->protection_type == 0)
2323 return;
2324
2325 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2326 SD_MAX_RETRIES, &data, &sshdr);
2327
2328 if (!scsi_status_is_good(res) || !data.header_length ||
2329 data.length < 6) {
2330 sd_printk(KERN_WARNING, sdkp,
2331 "getting Control mode page failed, assume no ATO\n");
2332
2333 if (scsi_sense_valid(&sshdr))
2334 sd_print_sense_hdr(sdkp, &sshdr);
2335
2336 return;
2337 }
2338
2339 offset = data.header_length + data.block_descriptor_length;
2340
2341 if ((buffer[offset] & 0x3f) != 0x0a) {
2342 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2343 return;
2344 }
2345
2346 if ((buffer[offset + 5] & 0x80) == 0)
2347 return;
2348
2349 sdkp->ATO = 1;
2350
2351 return;
2352}
2353
d11b6916
MP		 2354/**
2355 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2356 * @disk: disk to query
2357 */
2358static void sd_read_block_limits(struct scsi_disk *sdkp)
2359{
2360 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2361 const int vpd_len = 64;
e3deec09 2362 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2363
e3deec09
JB		 2364 if (!buffer ||
2365 /* Block Limits VPD */
2366 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2367 goto out;
d11b6916
MP		 2368
2369 blk_queue_io_min(sdkp->disk->queue,
2370 get_unaligned_be16(&buffer[6]) * sector_sz);
2371 blk_queue_io_opt(sdkp->disk->queue,
2372 get_unaligned_be32(&buffer[12]) * sector_sz);
2373
c98a0eb0
MP		 2374 if (buffer[3] == 0x3c) {
2375 unsigned int lba_count, desc_count;
e339c1a7 2376
c98a0eb0
MP		 2377 sdkp->max_ws_blocks =
2378 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2379 (u64)0xffffffff);
e339c1a7 2380
c98a0eb0 2381 if (!sdkp->lbpme)
045d3fe7 2382 goto out;
045d3fe7 2383
c98a0eb0
MP		 2384 lba_count = get_unaligned_be32(&buffer[20]);
2385 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2386
c98a0eb0
MP		 2387 if (lba_count && desc_count)
2388 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2389
c98a0eb0 2390 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2391
2392 if (buffer[32] & 0x80)
c98a0eb0 2393 sdkp->unmap_alignment =
e339c1a7 2394 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2395
2396 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2397
2398 if (sdkp->max_unmap_blocks)
2399 sd_config_discard(sdkp, SD_LBP_UNMAP);
2400 else
2401 sd_config_discard(sdkp, SD_LBP_WS16);
2402
2403 } else { /* LBP VPD page tells us what to use */
2404
2405 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2406 sd_config_discard(sdkp, SD_LBP_UNMAP);
2407 else if (sdkp->lbpws)
2408 sd_config_discard(sdkp, SD_LBP_WS16);
2409 else if (sdkp->lbpws10)
2410 sd_config_discard(sdkp, SD_LBP_WS10);
2411 else
2412 sd_config_discard(sdkp, SD_LBP_DISABLE);
2413 }
e339c1a7
MP		 2414 }
2415
e3deec09 2416 out:
d11b6916
MP		 2417 kfree(buffer);
2418}
2419
3821d768
MP		 2420/**
2421 * sd_read_block_characteristics - Query block dev. characteristics
2422 * @disk: disk to query
2423 */
2424static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2425{
e3deec09 2426 unsigned char *buffer;
3821d768 2427 u16 rot;
bb2d3de1 2428 const int vpd_len = 64;
3821d768 2429
e3deec09 2430 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2431
e3deec09
JB		 2432 if (!buffer ||
2433 /* Block Device Characteristics VPD */
2434 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2435 goto out;
3821d768
MP		 2436
2437 rot = get_unaligned_be16(&buffer[4]);
2438
2439 if (rot == 1)
2440 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2441
e3deec09 2442 out:
3821d768
MP		 2443 kfree(buffer);
2444}
2445
045d3fe7 2446/**
c98a0eb0 2447 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2448 * @disk: disk to query
2449 */
c98a0eb0 2450static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2451{
2452 unsigned char *buffer;
2453 const int vpd_len = 8;
2454
c98a0eb0 2455 if (sdkp->lbpme == 0)
045d3fe7
MP		 2456 return;
2457
2458 buffer = kmalloc(vpd_len, GFP_KERNEL);
2459
2460 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2461 goto out;
2462
c98a0eb0
MP		 2463 sdkp->lbpvpd = 1;
2464 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2465 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2466 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2467
2468 out:
2469 kfree(buffer);
2470}
2471
ffd4bc2a
MP		 2472static int sd_try_extended_inquiry(struct scsi_device *sdp)
2473{
2474 /*
2475 * Although VPD inquiries can go to SCSI-2 type devices,
2476 * some USB ones crash on receiving them, and the pages
2477 * we currently ask for are for SPC-3 and beyond
2478 */
09b6b51b 2479 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2480 return 1;
2481 return 0;
2482}
2483
1da177e4
LT		 2484/**
2485 * sd_revalidate_disk - called the first time a new disk is seen,
2486 * performs disk spin up, read_capacity, etc.
2487 * @disk: struct gendisk we care about
2488 **/
2489static int sd_revalidate_disk(struct gendisk *disk)
2490{
2491 struct scsi_disk *sdkp = scsi_disk(disk);
2492 struct scsi_device *sdp = sdkp->device;
1da177e4 2493 unsigned char *buffer;
4913efe4 2494 unsigned flush = 0;
1da177e4 2495
fa0d34be
MP		 2496 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2497 "sd_revalidate_disk\n"));
1da177e4
LT		 2498
2499 /*
2500 * If the device is offline, don't try and read capacity or any
2501 * of the other niceties.
2502 */
2503 if (!scsi_device_online(sdp))
2504 goto out;
2505
a6123f14 2506 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2507 if (!buffer) {
e73aec82
MP		 2508 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2509 "allocation failure.\n");
ea73a9f2 2510 goto out;
1da177e4
LT		 2511 }
2512
e73aec82 2513 sd_spinup_disk(sdkp);
1da177e4
LT		 2514
2515 /*
2516 * Without media there is no reason to ask; moreover, some devices
2517 * react badly if we do.
2518 */
2519 if (sdkp->media_present) {
e73aec82 2520 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2521
2522 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2523 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2524 sd_read_block_limits(sdkp);
2525 sd_read_block_characteristics(sdkp);
2526 }
2527
e73aec82
MP		 2528 sd_read_write_protect_flag(sdkp, buffer);
2529 sd_read_cache_type(sdkp, buffer);
e0597d70 2530 sd_read_app_tag_own(sdkp, buffer);
1da177e4 2531 }
461d4e90 2532
70a9b873
MP		 2533 sdkp->first_scan = 0;
2534
461d4e90
TH		 2535 /*
2536 * We now have all cache related info, determine how we deal
4913efe4 2537 * with flush requests.
461d4e90 2538 */
4913efe4
TH		 2539 if (sdkp->WCE) {
2540 flush |= REQ_FLUSH;
2541 if (sdkp->DPOFUA)
2542 flush |= REQ_FUA;
2543 }
461d4e90 2544
4913efe4 2545 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2546
1da177e4
LT		 2547 set_capacity(disk, sdkp->capacity);
2548 kfree(buffer);
2549
1da177e4
LT		 2550 out:
2551 return 0;
2552}
2553
72ec24bd
TH		 2554/**
2555 * sd_unlock_native_capacity - unlock native capacity
2556 * @disk: struct gendisk to set capacity for
2557 *
2558 * Block layer calls this function if it detects that partitions
2559 * on @disk reach beyond the end of the device. If the SCSI host
2560 * implements ->unlock_native_capacity() method, it's invoked to
2561 * give it a chance to adjust the device capacity.
2562 *
2563 * CONTEXT:
2564 * Defined by block layer. Might sleep.
2565 */
2566static void sd_unlock_native_capacity(struct gendisk *disk)
2567{
2568 struct scsi_device *sdev = scsi_disk(disk)->device;
2569
2570 if (sdev->host->hostt->unlock_native_capacity)
2571 sdev->host->hostt->unlock_native_capacity(sdev);
2572}
2573
3e1a7ff8
TH		 2574/**
2575 * sd_format_disk_name - format disk name
2576 * @prefix: name prefix - ie. "sd" for SCSI disks
2577 * @index: index of the disk to format name for
2578 * @buf: output buffer
2579 * @buflen: length of the output buffer
2580 *
2581 * SCSI disk names starts at sda. The 26th device is sdz and the
2582 * 27th is sdaa. The last one for two lettered suffix is sdzz
2583 * which is followed by sdaaa.
2584 *
2585 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2586 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2587 * determined using similar method as 26 base conversion with the
2588 * index shifted -1 after each digit is computed.
2589 *
2590 * CONTEXT:
2591 * Don't care.
2592 *
2593 * RETURNS:
2594 * 0 on success, -errno on failure.
2595 */
2596static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2597{
2598 const int base = 'z' - 'a' + 1;
2599 char *begin = buf + strlen(prefix);
2600 char *end = buf + buflen;
2601 char *p;
2602 int unit;
2603
2604 p = end - 1;
2605 *p = '\0';
2606 unit = base;
2607 do {
2608 if (p == begin)
2609 return -EINVAL;
2610 *--p = 'a' + (index % unit);
2611 index = (index / unit) - 1;
2612 } while (index >= 0);
2613
2614 memmove(begin, p, end - p);
2615 memcpy(buf, prefix, strlen(prefix));
2616
2617 return 0;
2618}
2619
4ace92fc
AV		 2620/*
2621 * The asynchronous part of sd_probe
2622 */
2623static void sd_probe_async(void *data, async_cookie_t cookie)
2624{
2625 struct scsi_disk *sdkp = data;
2626 struct scsi_device *sdp;
2627 struct gendisk *gd;
2628 u32 index;
2629 struct device *dev;
2630
2631 sdp = sdkp->device;
2632 gd = sdkp->disk;
2633 index = sdkp->index;
2634 dev = &sdp->sdev_gendev;
2635
1a03ae0f
MR		 2636 gd->major = sd_major((index & 0xf0) >> 4);
2637 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2638 gd->minors = SD_MINORS;
2639
4ace92fc
AV		 2640 gd->fops = &sd_fops;
2641 gd->private_data = &sdkp->driver;
2642 gd->queue = sdkp->device->request_queue;
2643
70a9b873
MP		 2644 /* defaults, until the device tells us otherwise */
2645 sdp->sector_size = 512;
2646 sdkp->capacity = 0;
2647 sdkp->media_present = 1;
2648 sdkp->write_prot = 0;
2649 sdkp->WCE = 0;
2650 sdkp->RCD = 0;
2651 sdkp->ATO = 0;
2652 sdkp->first_scan = 1;
18a4d0a2 2653 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2654
4ace92fc
AV		 2655 sd_revalidate_disk(gd);
2656
2657 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2658 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2659
2660 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2661 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2662 if (sdp->removable) {
4ace92fc 2663 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2664 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2665 }
4ace92fc 2666
4ace92fc 2667 add_disk(gd);
fe542396
MP		 2668 if (sdkp->capacity)
2669 sd_dif_config_host(sdkp);
4ace92fc 2670
3821d768
MP		 2671 sd_revalidate_disk(gd);
2672
4ace92fc
AV		 2673 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2674 sdp->removable ? "removable " : "");
478a8a05 2675 scsi_autopm_put_device(sdp);
ea038f63 2676 put_device(&sdkp->dev);
4ace92fc
AV		 2677}
2678
1da177e4
LT		 2679/**
2680 * sd_probe - called during driver initialization and whenever a
2681 * new scsi device is attached to the system. It is called once
2682 * for each scsi device (not just disks) present.
2683 * @dev: pointer to device object
2684 *
2685 * Returns 0 if successful (or not interested in this scsi device
2686 * (e.g. scanner)); 1 when there is an error.
2687 *
2688 * Note: this function is invoked from the scsi mid-level.
2689 * This function sets up the mapping between a given
2690 * <host,channel,id,lun> (found in sdp) and new device name
2691 * (e.g. /dev/sda). More precisely it is the block device major
2692 * and minor number that is chosen here.
2693 *
2db93ce8
PU		 2694 * Assume sd_probe is not re-entrant (for time being)
2695 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2696 **/
2697static int sd_probe(struct device *dev)
2698{
2699 struct scsi_device *sdp = to_scsi_device(dev);
2700 struct scsi_disk *sdkp;
2701 struct gendisk *gd;
439d77f7 2702 int index;
1da177e4
LT		 2703 int error;
2704
2705 error = -ENODEV;
631e8a13 2706 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2707 goto out;
2708
9ccfc756 2709 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2710 "sd_probe\n"));
1da177e4
LT		 2711
2712 error = -ENOMEM;
24669f75 2713 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2714 if (!sdkp)
2715 goto out;
2716
689d6fac 2717 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2718 if (!gd)
2719 goto out_free;
2720
f27bac27
TH		 2721 do {
2722 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2723 goto out_put;
1da177e4 2724
4034cc68 2725 spin_lock(&sd_index_lock);
f27bac27 2726 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2727 spin_unlock(&sd_index_lock);
f27bac27 2728 } while (error == -EAGAIN);
1da177e4 2729
21208ae5
DK		 2730 if (error) {
2731 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2732 goto out_put;
1a03ae0f
MR		 2733 }
2734
3e1a7ff8 2735 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2736 if (error) {
2737 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2738 goto out_free_index;
21208ae5 2739 }
f27bac27 2740
1da177e4
LT		 2741 sdkp->device = sdp;
2742 sdkp->driver = &sd_template;
2743 sdkp->disk = gd;
2744 sdkp->index = index;
409f3499 2745 atomic_set(&sdkp->openers, 0);
9e1a1537 2746 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2747
601e7638
JB		 2748 if (!sdp->request_queue->rq_timeout) {
2749 if (sdp->type != TYPE_MOD)
2750 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2751 else
2752 blk_queue_rq_timeout(sdp->request_queue,
2753 SD_MOD_TIMEOUT);
2754 }
2755
2756 device_initialize(&sdkp->dev);
478a8a05 2757 sdkp->dev.parent = dev;
601e7638 2758 sdkp->dev.class = &sd_disk_class;
478a8a05 2759 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2760
2761 if (device_add(&sdkp->dev))
2762 goto out_free_index;
2763
478a8a05
AS		 2764 get_device(dev);
2765 dev_set_drvdata(dev, sdkp);
601e7638 2766
ea038f63 2767 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2768 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2769
2770 return 0;
2771
f27bac27 2772 out_free_index:
4034cc68 2773 spin_lock(&sd_index_lock);
f27bac27 2774 ida_remove(&sd_index_ida, index);
4034cc68 2775 spin_unlock(&sd_index_lock);
6bdaa1f1 2776 out_put:
1da177e4 2777 put_disk(gd);
6bdaa1f1 2778 out_free:
1da177e4 2779 kfree(sdkp);
6bdaa1f1 2780 out:
1da177e4
LT		 2781 return error;
2782}
2783
2784/**
2785 * sd_remove - called whenever a scsi disk (previously recognized by
2786 * sd_probe) is detached from the system. It is called (potentially
2787 * multiple times) during sd module unload.
2788 * @sdp: pointer to mid level scsi device object
2789 *
2790 * Note: this function is invoked from the scsi mid-level.
2791 * This function potentially frees up a device name (e.g. /dev/sdc)
2792 * that could be re-used by a subsequent sd_probe().
2793 * This function is not called when the built-in sd driver is "exit-ed".
2794 **/
2795static int sd_remove(struct device *dev)
2796{
601e7638 2797 struct scsi_disk *sdkp;
1da177e4 2798
601e7638 2799 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2800 scsi_autopm_get_device(sdkp->device);
2801
a7a20d10 2802 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2803 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2804 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2805 device_del(&sdkp->dev);
1da177e4
LT		 2806 del_gendisk(sdkp->disk);
2807 sd_shutdown(dev);
39b7f1e2 2808
0b950672 2809 mutex_lock(&sd_ref_mutex);
39b7f1e2 2810 dev_set_drvdata(dev, NULL);
ee959b00 2811 put_device(&sdkp->dev);
0b950672 2812 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2813
2814 return 0;
2815}
2816
2817/**
2818 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2819 * @dev: pointer to embedded class device
1da177e4 2820 *
0b950672 2821 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2822 * called on last put, you should always use the scsi_disk_get()
2823 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2824 * and never do a direct put_device.
1da177e4 2825 **/
ee959b00 2826static void scsi_disk_release(struct device *dev)
1da177e4 2827{
ee959b00 2828 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 2829 struct gendisk *disk = sdkp->disk;
2830
4034cc68 2831 spin_lock(&sd_index_lock);
f27bac27 2832 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 2833 spin_unlock(&sd_index_lock);
1da177e4
LT		 2834
2835 disk->private_data = NULL;
1da177e4 2836 put_disk(disk);
39b7f1e2 2837 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 2838
2839 kfree(sdkp);
2840}
2841
cc5d2c8c 2842static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 2843{
2844 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2845 struct scsi_sense_hdr sshdr;
cc5d2c8c 2846 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 2847 int res;
2848
2849 if (start)
2850 cmd[4] |= 1; /* START */
2851
d2886ea3
SR		 2852 if (sdp->start_stop_pwr_cond)
2853 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2854
c3c94c5a
TH		 2855 if (!scsi_device_online(sdp))
2856 return -ENODEV;
2857
2858 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
f4f4e47e 2859 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
c3c94c5a 2860 if (res) {
cc5d2c8c
JB		 2861 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2862 sd_print_result(sdkp, res);
c3c94c5a 2863 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 2864 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 2865 }
2866
2867 return res;
2868}
2869
1da177e4
LT		 2870/*
2871 * Send a SYNCHRONIZE CACHE instruction down to the device through
2872 * the normal SCSI command structure. Wait for the command to
2873 * complete.
2874 */
2875static void sd_shutdown(struct device *dev)
2876{
39b7f1e2 2877 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 2878
2879 if (!sdkp)
2880 return; /* this can happen */
2881
54f57588
LM		 2882 if (pm_runtime_suspended(dev))
2883 goto exit;
2884
39b7f1e2 2885 if (sdkp->WCE) {
e73aec82
MP		 2886 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2887 sd_sync_cache(sdkp);
39b7f1e2 2888 }
c3c94c5a 2889
cc5d2c8c
JB		 2890 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2891 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2892 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2893 }
2894
54f57588 2895exit:
39b7f1e2
AS		 2896 scsi_disk_put(sdkp);
2897}
1da177e4 2898
c3c94c5a
TH		 2899static int sd_suspend(struct device *dev, pm_message_t mesg)
2900{
c3c94c5a 2901 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2902 int ret = 0;
c3c94c5a
TH		 2903
2904 if (!sdkp)
2905 return 0; /* this can happen */
2906
2907 if (sdkp->WCE) {
cc5d2c8c 2908 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 2909 ret = sd_sync_cache(sdkp);
2910 if (ret)
09ff92fe 2911 goto done;
c3c94c5a
TH		 2912 }
2913
3a2d5b70 2914 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 2915 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2916 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2917 }
2918
09ff92fe
AS		 2919done:
2920 scsi_disk_put(sdkp);
2921 return ret;
c3c94c5a
TH		 2922}
2923
2924static int sd_resume(struct device *dev)
2925{
c3c94c5a 2926 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2927 int ret = 0;
c3c94c5a 2928
cc5d2c8c 2929 if (!sdkp->device->manage_start_stop)
09ff92fe 2930 goto done;
c3c94c5a 2931
cc5d2c8c 2932 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 2933 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 2934
09ff92fe
AS		 2935done:
2936 scsi_disk_put(sdkp);
2937 return ret;
c3c94c5a
TH		 2938}
2939
1da177e4
LT		 2940/**
2941 * init_sd - entry point for this driver (both when built in or when
2942 * a module).
2943 *
2944 * Note: this function registers this driver with the scsi mid-level.
2945 **/
2946static int __init init_sd(void)
2947{
5e4009ba 2948 int majors = 0, i, err;
1da177e4
LT		 2949
2950 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2951
2952 for (i = 0; i < SD_MAJORS; i++)
2953 if (register_blkdev(sd_major(i), "sd") == 0)
2954 majors++;
2955
2956 if (!majors)
2957 return -ENODEV;
2958
5e4009ba
JG		 2959 err = class_register(&sd_disk_class);
2960 if (err)
2961 goto err_out;
6bdaa1f1 2962
5e4009ba
JG		 2963 err = scsi_register_driver(&sd_template.gendrv);
2964 if (err)
2965 goto err_out_class;
2966
4e7392ec
MP		 2967 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2968 0, 0, NULL);
2969 if (!sd_cdb_cache) {
2970 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2971 goto err_out_class;
2972 }
2973
2974 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2975 if (!sd_cdb_pool) {
2976 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2977 goto err_out_cache;
2978 }
2979
5e4009ba
JG		 2980 return 0;
2981
4e7392ec
MP		 2982err_out_cache:
2983 kmem_cache_destroy(sd_cdb_cache);
2984
5e4009ba
JG		 2985err_out_class:
2986 class_unregister(&sd_disk_class);
2987err_out:
2988 for (i = 0; i < SD_MAJORS; i++)
2989 unregister_blkdev(sd_major(i), "sd");
2990 return err;
1da177e4
LT		 2991}
2992
2993/**
2994 * exit_sd - exit point for this driver (when it is a module).
2995 *
2996 * Note: this function unregisters this driver from the scsi mid-level.
2997 **/
2998static void __exit exit_sd(void)
2999{
3000 int i;
3001
3002 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3003
4e7392ec
MP		 3004 mempool_destroy(sd_cdb_pool);
3005 kmem_cache_destroy(sd_cdb_cache);
3006
1da177e4 3007 scsi_unregister_driver(&sd_template.gendrv);
5e4009ba
JG		 3008 class_unregister(&sd_disk_class);
3009
1da177e4
LT		 3010 for (i = 0; i < SD_MAJORS; i++)
3011 unregister_blkdev(sd_major(i), "sd");
3012}
3013
1da177e4
LT		 3014module_init(init_sd);
3015module_exit(exit_sd);
e73aec82
MP		 3016
3017static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3018 struct scsi_sense_hdr *sshdr)
3019{
2e4c3329 3020 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3021 scsi_show_sense_hdr(sshdr);
2e4c3329 3022 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3023 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3024}
3025
3026static void sd_print_result(struct scsi_disk *sdkp, int result)
3027{
2e4c3329 3028 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3029 scsi_show_result(result);
3030}
3031
Linux kernel - Deliverables
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