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Merge branch 'misc' into for-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / sd.c
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
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
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>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
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>
65 #include <scsi/scsicam.h>
66
67 #include "sd.h"
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
70
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
74
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS 16
97 #else
98 #define SD_MINORS 0
99 #endif
100
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend(struct device *);
109 static int sd_resume(struct device *);
110 static void sd_rescan(struct device *);
111 static int sd_done(struct scsi_cmnd *);
112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
114 static void scsi_disk_release(struct device *cdev);
115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116 static void sd_print_result(struct scsi_disk *, int);
117
118 static DEFINE_SPINLOCK(sd_index_lock);
119 static DEFINE_IDA(sd_index_ida);
120
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex);
125
126 static struct kmem_cache *sd_cdb_cache;
127 static mempool_t *sd_cdb_pool;
128
129 static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
132 };
133
134 static ssize_t
135 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
137 {
138 int i, ct = -1, rcd, wce, sp;
139 struct scsi_disk *sdkp = to_scsi_disk(dev);
140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
145 const char *temp = "temporary ";
146 int len;
147
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
153
154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
159 }
160
161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
162 len = strlen(sd_cache_types[i]);
163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
167 }
168 }
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
173
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
178 }
179
180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
190
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
194 sd_print_sense_hdr(sdkp, &sshdr);
195 return -EINVAL;
196 }
197 revalidate_disk(sdkp->disk);
198 return count;
199 }
200
201 static ssize_t
202 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
204 {
205 struct scsi_disk *sdkp = to_scsi_disk(dev);
206 struct scsi_device *sdp = sdkp->device;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EACCES;
210
211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
212
213 return count;
214 }
215
216 static ssize_t
217 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
219 {
220 struct scsi_disk *sdkp = to_scsi_disk(dev);
221 struct scsi_device *sdp = sdkp->device;
222
223 if (!capable(CAP_SYS_ADMIN))
224 return -EACCES;
225
226 if (sdp->type != TYPE_DISK)
227 return -EINVAL;
228
229 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
230
231 return count;
232 }
233
234 static ssize_t
235 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
236 char *buf)
237 {
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 int ct = sdkp->RCD + 2*sdkp->WCE;
240
241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
242 }
243
244 static ssize_t
245 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
246 {
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
250 }
251
252 static ssize_t
253 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
254 char *buf)
255 {
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 struct scsi_device *sdp = sdkp->device;
258
259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
260 }
261
262 static ssize_t
263 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
264 char *buf)
265 {
266 struct scsi_disk *sdkp = to_scsi_disk(dev);
267
268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
269 }
270
271 static ssize_t
272 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
273 char *buf)
274 {
275 struct scsi_disk *sdkp = to_scsi_disk(dev);
276
277 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
278 }
279
280 static ssize_t
281 sd_store_protection_type(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283 {
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
285 unsigned int val;
286 int err;
287
288 if (!capable(CAP_SYS_ADMIN))
289 return -EACCES;
290
291 err = kstrtouint(buf, 10, &val);
292
293 if (err)
294 return err;
295
296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
297 sdkp->protection_type = val;
298
299 return count;
300 }
301
302 static ssize_t
303 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
304 char *buf)
305 {
306 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 struct scsi_device *sdp = sdkp->device;
308 unsigned int dif, dix;
309
310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
312
313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
314 dif = 0;
315 dix = 1;
316 }
317
318 if (!dif && !dix)
319 return snprintf(buf, 20, "none\n");
320
321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
322 }
323
324 static ssize_t
325 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
326 char *buf)
327 {
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329
330 return snprintf(buf, 20, "%u\n", sdkp->ATO);
331 }
332
333 static ssize_t
334 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
335 char *buf)
336 {
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
338
339 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
340 }
341
342 static const char *lbp_mode[] = {
343 [SD_LBP_FULL] = "full",
344 [SD_LBP_UNMAP] = "unmap",
345 [SD_LBP_WS16] = "writesame_16",
346 [SD_LBP_WS10] = "writesame_10",
347 [SD_LBP_ZERO] = "writesame_zero",
348 [SD_LBP_DISABLE] = "disabled",
349 };
350
351 static ssize_t
352 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
353 char *buf)
354 {
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
358 }
359
360 static ssize_t
361 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t count)
363 {
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
365 struct scsi_device *sdp = sdkp->device;
366
367 if (!capable(CAP_SYS_ADMIN))
368 return -EACCES;
369
370 if (sdp->type != TYPE_DISK)
371 return -EINVAL;
372
373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
374 sd_config_discard(sdkp, SD_LBP_UNMAP);
375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
376 sd_config_discard(sdkp, SD_LBP_WS16);
377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
378 sd_config_discard(sdkp, SD_LBP_WS10);
379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
380 sd_config_discard(sdkp, SD_LBP_ZERO);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
382 sd_config_discard(sdkp, SD_LBP_DISABLE);
383 else
384 return -EINVAL;
385
386 return count;
387 }
388
389 static ssize_t
390 sd_show_max_medium_access_timeouts(struct device *dev,
391 struct device_attribute *attr, char *buf)
392 {
393 struct scsi_disk *sdkp = to_scsi_disk(dev);
394
395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
396 }
397
398 static ssize_t
399 sd_store_max_medium_access_timeouts(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402 {
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404 int err;
405
406 if (!capable(CAP_SYS_ADMIN))
407 return -EACCES;
408
409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
410
411 return err ? err : count;
412 }
413
414 static ssize_t
415 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
416 char *buf)
417 {
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
421 }
422
423 static ssize_t
424 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
426 {
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428 struct scsi_device *sdp = sdkp->device;
429 unsigned long max;
430 int err;
431
432 if (!capable(CAP_SYS_ADMIN))
433 return -EACCES;
434
435 if (sdp->type != TYPE_DISK)
436 return -EINVAL;
437
438 err = kstrtoul(buf, 10, &max);
439
440 if (err)
441 return err;
442
443 if (max == 0)
444 sdp->no_write_same = 1;
445 else if (max <= SD_MAX_WS16_BLOCKS)
446 sdkp->max_ws_blocks = max;
447
448 sd_config_write_same(sdkp);
449
450 return count;
451 }
452
453 static struct device_attribute sd_disk_attrs[] = {
454 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
455 sd_store_cache_type),
456 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
457 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
458 sd_store_allow_restart),
459 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
460 sd_store_manage_start_stop),
461 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
462 sd_store_protection_type),
463 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
464 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
465 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
466 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
467 sd_store_provisioning_mode),
468 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
469 sd_show_write_same_blocks, sd_store_write_same_blocks),
470 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
471 sd_show_max_medium_access_timeouts,
472 sd_store_max_medium_access_timeouts),
473 __ATTR_NULL,
474 };
475
476 static struct class sd_disk_class = {
477 .name = "scsi_disk",
478 .owner = THIS_MODULE,
479 .dev_release = scsi_disk_release,
480 .dev_attrs = sd_disk_attrs,
481 };
482
483 static const struct dev_pm_ops sd_pm_ops = {
484 .suspend = sd_suspend,
485 .resume = sd_resume,
486 .poweroff = sd_suspend,
487 .restore = sd_resume,
488 .runtime_suspend = sd_suspend,
489 .runtime_resume = sd_resume,
490 };
491
492 static struct scsi_driver sd_template = {
493 .owner = THIS_MODULE,
494 .gendrv = {
495 .name = "sd",
496 .probe = sd_probe,
497 .remove = sd_remove,
498 .shutdown = sd_shutdown,
499 .pm = &sd_pm_ops,
500 },
501 .rescan = sd_rescan,
502 .done = sd_done,
503 .eh_action = sd_eh_action,
504 };
505
506 /*
507 * Device no to disk mapping:
508 *
509 * major disc2 disc p1
510 * |............|.............|....|....| <- dev_t
511 * 31 20 19 8 7 4 3 0
512 *
513 * Inside a major, we have 16k disks, however mapped non-
514 * contiguously. The first 16 disks are for major0, the next
515 * ones with major1, ... Disk 256 is for major0 again, disk 272
516 * for major1, ...
517 * As we stay compatible with our numbering scheme, we can reuse
518 * the well-know SCSI majors 8, 65--71, 136--143.
519 */
520 static int sd_major(int major_idx)
521 {
522 switch (major_idx) {
523 case 0:
524 return SCSI_DISK0_MAJOR;
525 case 1 ... 7:
526 return SCSI_DISK1_MAJOR + major_idx - 1;
527 case 8 ... 15:
528 return SCSI_DISK8_MAJOR + major_idx - 8;
529 default:
530 BUG();
531 return 0; /* shut up gcc */
532 }
533 }
534
535 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
536 {
537 struct scsi_disk *sdkp = NULL;
538
539 if (disk->private_data) {
540 sdkp = scsi_disk(disk);
541 if (scsi_device_get(sdkp->device) == 0)
542 get_device(&sdkp->dev);
543 else
544 sdkp = NULL;
545 }
546 return sdkp;
547 }
548
549 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
550 {
551 struct scsi_disk *sdkp;
552
553 mutex_lock(&sd_ref_mutex);
554 sdkp = __scsi_disk_get(disk);
555 mutex_unlock(&sd_ref_mutex);
556 return sdkp;
557 }
558
559 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
560 {
561 struct scsi_disk *sdkp;
562
563 mutex_lock(&sd_ref_mutex);
564 sdkp = dev_get_drvdata(dev);
565 if (sdkp)
566 sdkp = __scsi_disk_get(sdkp->disk);
567 mutex_unlock(&sd_ref_mutex);
568 return sdkp;
569 }
570
571 static void scsi_disk_put(struct scsi_disk *sdkp)
572 {
573 struct scsi_device *sdev = sdkp->device;
574
575 mutex_lock(&sd_ref_mutex);
576 put_device(&sdkp->dev);
577 scsi_device_put(sdev);
578 mutex_unlock(&sd_ref_mutex);
579 }
580
581 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
582 {
583 unsigned int prot_op = SCSI_PROT_NORMAL;
584 unsigned int dix = scsi_prot_sg_count(scmd);
585
586 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
587 if (dif && dix)
588 prot_op = SCSI_PROT_READ_PASS;
589 else if (dif && !dix)
590 prot_op = SCSI_PROT_READ_STRIP;
591 else if (!dif && dix)
592 prot_op = SCSI_PROT_READ_INSERT;
593 } else {
594 if (dif && dix)
595 prot_op = SCSI_PROT_WRITE_PASS;
596 else if (dif && !dix)
597 prot_op = SCSI_PROT_WRITE_INSERT;
598 else if (!dif && dix)
599 prot_op = SCSI_PROT_WRITE_STRIP;
600 }
601
602 scsi_set_prot_op(scmd, prot_op);
603 scsi_set_prot_type(scmd, dif);
604 }
605
606 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
607 {
608 struct request_queue *q = sdkp->disk->queue;
609 unsigned int logical_block_size = sdkp->device->sector_size;
610 unsigned int max_blocks = 0;
611
612 q->limits.discard_zeroes_data = sdkp->lbprz;
613 q->limits.discard_alignment = sdkp->unmap_alignment *
614 logical_block_size;
615 q->limits.discard_granularity =
616 max(sdkp->physical_block_size,
617 sdkp->unmap_granularity * logical_block_size);
618
619 sdkp->provisioning_mode = mode;
620
621 switch (mode) {
622
623 case SD_LBP_DISABLE:
624 q->limits.max_discard_sectors = 0;
625 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
626 return;
627
628 case SD_LBP_UNMAP:
629 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
630 (u32)SD_MAX_WS16_BLOCKS);
631 break;
632
633 case SD_LBP_WS16:
634 max_blocks = min_not_zero(sdkp->max_ws_blocks,
635 (u32)SD_MAX_WS16_BLOCKS);
636 break;
637
638 case SD_LBP_WS10:
639 max_blocks = min_not_zero(sdkp->max_ws_blocks,
640 (u32)SD_MAX_WS10_BLOCKS);
641 break;
642
643 case SD_LBP_ZERO:
644 max_blocks = min_not_zero(sdkp->max_ws_blocks,
645 (u32)SD_MAX_WS10_BLOCKS);
646 q->limits.discard_zeroes_data = 1;
647 break;
648 }
649
650 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
651 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
652 }
653
654 /**
655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
656 * @sdp: scsi device to operate one
657 * @rq: Request to prepare
658 *
659 * Will issue either UNMAP or WRITE SAME(16) depending on preference
660 * indicated by target device.
661 **/
662 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
663 {
664 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
665 sector_t sector = blk_rq_pos(rq);
666 unsigned int nr_sectors = blk_rq_sectors(rq);
667 unsigned int nr_bytes = blk_rq_bytes(rq);
668 unsigned int len;
669 int ret;
670 char *buf;
671 struct page *page;
672
673 sector >>= ilog2(sdp->sector_size) - 9;
674 nr_sectors >>= ilog2(sdp->sector_size) - 9;
675 rq->timeout = SD_TIMEOUT;
676
677 memset(rq->cmd, 0, rq->cmd_len);
678
679 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
680 if (!page)
681 return BLKPREP_DEFER;
682
683 switch (sdkp->provisioning_mode) {
684 case SD_LBP_UNMAP:
685 buf = page_address(page);
686
687 rq->cmd_len = 10;
688 rq->cmd[0] = UNMAP;
689 rq->cmd[8] = 24;
690
691 put_unaligned_be16(6 + 16, &buf[0]);
692 put_unaligned_be16(16, &buf[2]);
693 put_unaligned_be64(sector, &buf[8]);
694 put_unaligned_be32(nr_sectors, &buf[16]);
695
696 len = 24;
697 break;
698
699 case SD_LBP_WS16:
700 rq->cmd_len = 16;
701 rq->cmd[0] = WRITE_SAME_16;
702 rq->cmd[1] = 0x8; /* UNMAP */
703 put_unaligned_be64(sector, &rq->cmd[2]);
704 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
705
706 len = sdkp->device->sector_size;
707 break;
708
709 case SD_LBP_WS10:
710 case SD_LBP_ZERO:
711 rq->cmd_len = 10;
712 rq->cmd[0] = WRITE_SAME;
713 if (sdkp->provisioning_mode == SD_LBP_WS10)
714 rq->cmd[1] = 0x8; /* UNMAP */
715 put_unaligned_be32(sector, &rq->cmd[2]);
716 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
717
718 len = sdkp->device->sector_size;
719 break;
720
721 default:
722 ret = BLKPREP_KILL;
723 goto out;
724 }
725
726 blk_add_request_payload(rq, page, len);
727 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
728 rq->buffer = page_address(page);
729 rq->__data_len = nr_bytes;
730
731 out:
732 if (ret != BLKPREP_OK) {
733 __free_page(page);
734 rq->buffer = NULL;
735 }
736 return ret;
737 }
738
739 static void sd_config_write_same(struct scsi_disk *sdkp)
740 {
741 struct request_queue *q = sdkp->disk->queue;
742 unsigned int logical_block_size = sdkp->device->sector_size;
743 unsigned int blocks = 0;
744
745 if (sdkp->device->no_write_same) {
746 sdkp->max_ws_blocks = 0;
747 goto out;
748 }
749
750 /* Some devices can not handle block counts above 0xffff despite
751 * supporting WRITE SAME(16). Consequently we default to 64k
752 * blocks per I/O unless the device explicitly advertises a
753 * bigger limit.
754 */
755 if (sdkp->max_ws_blocks == 0)
756 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
757
758 if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
759 blocks = min_not_zero(sdkp->max_ws_blocks,
760 (u32)SD_MAX_WS16_BLOCKS);
761 else
762 blocks = min_not_zero(sdkp->max_ws_blocks,
763 (u32)SD_MAX_WS10_BLOCKS);
764
765 out:
766 blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
767 }
768
769 /**
770 * sd_setup_write_same_cmnd - write the same data to multiple blocks
771 * @sdp: scsi device to operate one
772 * @rq: Request to prepare
773 *
774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
775 * preference indicated by target device.
776 **/
777 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
778 {
779 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
780 struct bio *bio = rq->bio;
781 sector_t sector = blk_rq_pos(rq);
782 unsigned int nr_sectors = blk_rq_sectors(rq);
783 unsigned int nr_bytes = blk_rq_bytes(rq);
784 int ret;
785
786 if (sdkp->device->no_write_same)
787 return BLKPREP_KILL;
788
789 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
790
791 sector >>= ilog2(sdp->sector_size) - 9;
792 nr_sectors >>= ilog2(sdp->sector_size) - 9;
793
794 rq->__data_len = sdp->sector_size;
795 rq->timeout = SD_WRITE_SAME_TIMEOUT;
796 memset(rq->cmd, 0, rq->cmd_len);
797
798 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
799 rq->cmd_len = 16;
800 rq->cmd[0] = WRITE_SAME_16;
801 put_unaligned_be64(sector, &rq->cmd[2]);
802 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
803 } else {
804 rq->cmd_len = 10;
805 rq->cmd[0] = WRITE_SAME;
806 put_unaligned_be32(sector, &rq->cmd[2]);
807 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
808 }
809
810 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
811 rq->__data_len = nr_bytes;
812
813 return ret;
814 }
815
816 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
817 {
818 rq->timeout = SD_FLUSH_TIMEOUT;
819 rq->retries = SD_MAX_RETRIES;
820 rq->cmd[0] = SYNCHRONIZE_CACHE;
821 rq->cmd_len = 10;
822
823 return scsi_setup_blk_pc_cmnd(sdp, rq);
824 }
825
826 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
827 {
828 if (rq->cmd_flags & REQ_DISCARD) {
829 free_page((unsigned long)rq->buffer);
830 rq->buffer = NULL;
831 }
832 }
833
834 /**
835 * sd_prep_fn - build a scsi (read or write) command from
836 * information in the request structure.
837 * @SCpnt: pointer to mid-level's per scsi command structure that
838 * contains request and into which the scsi command is written
839 *
840 * Returns 1 if successful and 0 if error (or cannot be done now).
841 **/
842 static int sd_prep_fn(struct request_queue *q, struct request *rq)
843 {
844 struct scsi_cmnd *SCpnt;
845 struct scsi_device *sdp = q->queuedata;
846 struct gendisk *disk = rq->rq_disk;
847 struct scsi_disk *sdkp;
848 sector_t block = blk_rq_pos(rq);
849 sector_t threshold;
850 unsigned int this_count = blk_rq_sectors(rq);
851 int ret, host_dif;
852 unsigned char protect;
853
854 /*
855 * Discard request come in as REQ_TYPE_FS but we turn them into
856 * block PC requests to make life easier.
857 */
858 if (rq->cmd_flags & REQ_DISCARD) {
859 ret = sd_setup_discard_cmnd(sdp, rq);
860 goto out;
861 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
862 ret = sd_setup_write_same_cmnd(sdp, rq);
863 goto out;
864 } else if (rq->cmd_flags & REQ_FLUSH) {
865 ret = scsi_setup_flush_cmnd(sdp, rq);
866 goto out;
867 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
868 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
869 goto out;
870 } else if (rq->cmd_type != REQ_TYPE_FS) {
871 ret = BLKPREP_KILL;
872 goto out;
873 }
874 ret = scsi_setup_fs_cmnd(sdp, rq);
875 if (ret != BLKPREP_OK)
876 goto out;
877 SCpnt = rq->special;
878 sdkp = scsi_disk(disk);
879
880 /* from here on until we're complete, any goto out
881 * is used for a killable error condition */
882 ret = BLKPREP_KILL;
883
884 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
885 "sd_prep_fn: block=%llu, "
886 "count=%d\n",
887 (unsigned long long)block,
888 this_count));
889
890 if (!sdp || !scsi_device_online(sdp) ||
891 block + blk_rq_sectors(rq) > get_capacity(disk)) {
892 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
893 "Finishing %u sectors\n",
894 blk_rq_sectors(rq)));
895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
896 "Retry with 0x%p\n", SCpnt));
897 goto out;
898 }
899
900 if (sdp->changed) {
901 /*
902 * quietly refuse to do anything to a changed disc until
903 * the changed bit has been reset
904 */
905 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
906 goto out;
907 }
908
909 /*
910 * Some SD card readers can't handle multi-sector accesses which touch
911 * the last one or two hardware sectors. Split accesses as needed.
912 */
913 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
914 (sdp->sector_size / 512);
915
916 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
917 if (block < threshold) {
918 /* Access up to the threshold but not beyond */
919 this_count = threshold - block;
920 } else {
921 /* Access only a single hardware sector */
922 this_count = sdp->sector_size / 512;
923 }
924 }
925
926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
927 (unsigned long long)block));
928
929 /*
930 * If we have a 1K hardware sectorsize, prevent access to single
931 * 512 byte sectors. In theory we could handle this - in fact
932 * the scsi cdrom driver must be able to handle this because
933 * we typically use 1K blocksizes, and cdroms typically have
934 * 2K hardware sectorsizes. Of course, things are simpler
935 * with the cdrom, since it is read-only. For performance
936 * reasons, the filesystems should be able to handle this
937 * and not force the scsi disk driver to use bounce buffers
938 * for this.
939 */
940 if (sdp->sector_size == 1024) {
941 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
942 scmd_printk(KERN_ERR, SCpnt,
943 "Bad block number requested\n");
944 goto out;
945 } else {
946 block = block >> 1;
947 this_count = this_count >> 1;
948 }
949 }
950 if (sdp->sector_size == 2048) {
951 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
954 goto out;
955 } else {
956 block = block >> 2;
957 this_count = this_count >> 2;
958 }
959 }
960 if (sdp->sector_size == 4096) {
961 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
964 goto out;
965 } else {
966 block = block >> 3;
967 this_count = this_count >> 3;
968 }
969 }
970 if (rq_data_dir(rq) == WRITE) {
971 if (!sdp->writeable) {
972 goto out;
973 }
974 SCpnt->cmnd[0] = WRITE_6;
975 SCpnt->sc_data_direction = DMA_TO_DEVICE;
976
977 if (blk_integrity_rq(rq))
978 sd_dif_prepare(rq, block, sdp->sector_size);
979
980 } else if (rq_data_dir(rq) == READ) {
981 SCpnt->cmnd[0] = READ_6;
982 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
983 } else {
984 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
985 goto out;
986 }
987
988 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
989 "%s %d/%u 512 byte blocks.\n",
990 (rq_data_dir(rq) == WRITE) ?
991 "writing" : "reading", this_count,
992 blk_rq_sectors(rq)));
993
994 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
995 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
996 if (host_dif)
997 protect = 1 << 5;
998 else
999 protect = 0;
1000
1001 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1002 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1003
1004 if (unlikely(SCpnt->cmnd == NULL)) {
1005 ret = BLKPREP_DEFER;
1006 goto out;
1007 }
1008
1009 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1010 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1011 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1012 SCpnt->cmnd[7] = 0x18;
1013 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1014 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1015
1016 /* LBA */
1017 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1022 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1023 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1024 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1025
1026 /* Expected Indirect LBA */
1027 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1028 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1029 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1030 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1031
1032 /* Transfer length */
1033 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1034 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1035 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1036 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1037 } else if (sdp->use_16_for_rw) {
1038 SCpnt->cmnd[0] += READ_16 - READ_6;
1039 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1040 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1041 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1042 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1043 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1044 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1045 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1046 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1047 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1048 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1049 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1050 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1051 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1052 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1053 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1054 scsi_device_protection(SCpnt->device) ||
1055 SCpnt->device->use_10_for_rw) {
1056 if (this_count > 0xffff)
1057 this_count = 0xffff;
1058
1059 SCpnt->cmnd[0] += READ_10 - READ_6;
1060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1061 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1062 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1063 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1064 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1065 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1066 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1067 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1068 } else {
1069 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1070 /*
1071 * This happens only if this drive failed
1072 * 10byte rw command with ILLEGAL_REQUEST
1073 * during operation and thus turned off
1074 * use_10_for_rw.
1075 */
1076 scmd_printk(KERN_ERR, SCpnt,
1077 "FUA write on READ/WRITE(6) drive\n");
1078 goto out;
1079 }
1080
1081 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1082 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1083 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1084 SCpnt->cmnd[4] = (unsigned char) this_count;
1085 SCpnt->cmnd[5] = 0;
1086 }
1087 SCpnt->sdb.length = this_count * sdp->sector_size;
1088
1089 /* If DIF or DIX is enabled, tell HBA how to handle request */
1090 if (host_dif || scsi_prot_sg_count(SCpnt))
1091 sd_prot_op(SCpnt, host_dif);
1092
1093 /*
1094 * We shouldn't disconnect in the middle of a sector, so with a dumb
1095 * host adapter, it's safe to assume that we can at least transfer
1096 * this many bytes between each connect / disconnect.
1097 */
1098 SCpnt->transfersize = sdp->sector_size;
1099 SCpnt->underflow = this_count << 9;
1100 SCpnt->allowed = SD_MAX_RETRIES;
1101
1102 /*
1103 * This indicates that the command is ready from our end to be
1104 * queued.
1105 */
1106 ret = BLKPREP_OK;
1107 out:
1108 return scsi_prep_return(q, rq, ret);
1109 }
1110
1111 /**
1112 * sd_open - open a scsi disk device
1113 * @inode: only i_rdev member may be used
1114 * @filp: only f_mode and f_flags may be used
1115 *
1116 * Returns 0 if successful. Returns a negated errno value in case
1117 * of error.
1118 *
1119 * Note: This can be called from a user context (e.g. fsck(1) )
1120 * or from within the kernel (e.g. as a result of a mount(1) ).
1121 * In the latter case @inode and @filp carry an abridged amount
1122 * of information as noted above.
1123 *
1124 * Locking: called with bdev->bd_mutex held.
1125 **/
1126 static int sd_open(struct block_device *bdev, fmode_t mode)
1127 {
1128 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1129 struct scsi_device *sdev;
1130 int retval;
1131
1132 if (!sdkp)
1133 return -ENXIO;
1134
1135 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1136
1137 sdev = sdkp->device;
1138
1139 retval = scsi_autopm_get_device(sdev);
1140 if (retval)
1141 goto error_autopm;
1142
1143 /*
1144 * If the device is in error recovery, wait until it is done.
1145 * If the device is offline, then disallow any access to it.
1146 */
1147 retval = -ENXIO;
1148 if (!scsi_block_when_processing_errors(sdev))
1149 goto error_out;
1150
1151 if (sdev->removable || sdkp->write_prot)
1152 check_disk_change(bdev);
1153
1154 /*
1155 * If the drive is empty, just let the open fail.
1156 */
1157 retval = -ENOMEDIUM;
1158 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1159 goto error_out;
1160
1161 /*
1162 * If the device has the write protect tab set, have the open fail
1163 * if the user expects to be able to write to the thing.
1164 */
1165 retval = -EROFS;
1166 if (sdkp->write_prot && (mode & FMODE_WRITE))
1167 goto error_out;
1168
1169 /*
1170 * It is possible that the disk changing stuff resulted in
1171 * the device being taken offline. If this is the case,
1172 * report this to the user, and don't pretend that the
1173 * open actually succeeded.
1174 */
1175 retval = -ENXIO;
1176 if (!scsi_device_online(sdev))
1177 goto error_out;
1178
1179 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1180 if (scsi_block_when_processing_errors(sdev))
1181 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1182 }
1183
1184 return 0;
1185
1186 error_out:
1187 scsi_autopm_put_device(sdev);
1188 error_autopm:
1189 scsi_disk_put(sdkp);
1190 return retval;
1191 }
1192
1193 /**
1194 * sd_release - invoked when the (last) close(2) is called on this
1195 * scsi disk.
1196 * @inode: only i_rdev member may be used
1197 * @filp: only f_mode and f_flags may be used
1198 *
1199 * Returns 0.
1200 *
1201 * Note: may block (uninterruptible) if error recovery is underway
1202 * on this disk.
1203 *
1204 * Locking: called with bdev->bd_mutex held.
1205 **/
1206 static void sd_release(struct gendisk *disk, fmode_t mode)
1207 {
1208 struct scsi_disk *sdkp = scsi_disk(disk);
1209 struct scsi_device *sdev = sdkp->device;
1210
1211 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1212
1213 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1214 if (scsi_block_when_processing_errors(sdev))
1215 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1216 }
1217
1218 /*
1219 * XXX and what if there are packets in flight and this close()
1220 * XXX is followed by a "rmmod sd_mod"?
1221 */
1222
1223 scsi_autopm_put_device(sdev);
1224 scsi_disk_put(sdkp);
1225 }
1226
1227 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1228 {
1229 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1230 struct scsi_device *sdp = sdkp->device;
1231 struct Scsi_Host *host = sdp->host;
1232 int diskinfo[4];
1233
1234 /* default to most commonly used values */
1235 diskinfo[0] = 0x40; /* 1 << 6 */
1236 diskinfo[1] = 0x20; /* 1 << 5 */
1237 diskinfo[2] = sdkp->capacity >> 11;
1238
1239 /* override with calculated, extended default, or driver values */
1240 if (host->hostt->bios_param)
1241 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1242 else
1243 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1244
1245 geo->heads = diskinfo[0];
1246 geo->sectors = diskinfo[1];
1247 geo->cylinders = diskinfo[2];
1248 return 0;
1249 }
1250
1251 /**
1252 * sd_ioctl - process an ioctl
1253 * @inode: only i_rdev/i_bdev members may be used
1254 * @filp: only f_mode and f_flags may be used
1255 * @cmd: ioctl command number
1256 * @arg: this is third argument given to ioctl(2) system call.
1257 * Often contains a pointer.
1258 *
1259 * Returns 0 if successful (some ioctls return positive numbers on
1260 * success as well). Returns a negated errno value in case of error.
1261 *
1262 * Note: most ioctls are forward onto the block subsystem or further
1263 * down in the scsi subsystem.
1264 **/
1265 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1266 unsigned int cmd, unsigned long arg)
1267 {
1268 struct gendisk *disk = bdev->bd_disk;
1269 struct scsi_disk *sdkp = scsi_disk(disk);
1270 struct scsi_device *sdp = sdkp->device;
1271 void __user *p = (void __user *)arg;
1272 int error;
1273
1274 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1275 "cmd=0x%x\n", disk->disk_name, cmd));
1276
1277 error = scsi_verify_blk_ioctl(bdev, cmd);
1278 if (error < 0)
1279 return error;
1280
1281 /*
1282 * If we are in the middle of error recovery, don't let anyone
1283 * else try and use this device. Also, if error recovery fails, it
1284 * may try and take the device offline, in which case all further
1285 * access to the device is prohibited.
1286 */
1287 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1288 (mode & FMODE_NDELAY) != 0);
1289 if (!scsi_block_when_processing_errors(sdp) || !error)
1290 goto out;
1291
1292 /*
1293 * Send SCSI addressing ioctls directly to mid level, send other
1294 * ioctls to block level and then onto mid level if they can't be
1295 * resolved.
1296 */
1297 switch (cmd) {
1298 case SCSI_IOCTL_GET_IDLUN:
1299 case SCSI_IOCTL_GET_BUS_NUMBER:
1300 error = scsi_ioctl(sdp, cmd, p);
1301 break;
1302 default:
1303 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1304 if (error != -ENOTTY)
1305 break;
1306 error = scsi_ioctl(sdp, cmd, p);
1307 break;
1308 }
1309 out:
1310 return error;
1311 }
1312
1313 static void set_media_not_present(struct scsi_disk *sdkp)
1314 {
1315 if (sdkp->media_present)
1316 sdkp->device->changed = 1;
1317
1318 if (sdkp->device->removable) {
1319 sdkp->media_present = 0;
1320 sdkp->capacity = 0;
1321 }
1322 }
1323
1324 static int media_not_present(struct scsi_disk *sdkp,
1325 struct scsi_sense_hdr *sshdr)
1326 {
1327 if (!scsi_sense_valid(sshdr))
1328 return 0;
1329
1330 /* not invoked for commands that could return deferred errors */
1331 switch (sshdr->sense_key) {
1332 case UNIT_ATTENTION:
1333 case NOT_READY:
1334 /* medium not present */
1335 if (sshdr->asc == 0x3A) {
1336 set_media_not_present(sdkp);
1337 return 1;
1338 }
1339 }
1340 return 0;
1341 }
1342
1343 /**
1344 * sd_check_events - check media events
1345 * @disk: kernel device descriptor
1346 * @clearing: disk events currently being cleared
1347 *
1348 * Returns mask of DISK_EVENT_*.
1349 *
1350 * Note: this function is invoked from the block subsystem.
1351 **/
1352 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1353 {
1354 struct scsi_disk *sdkp = scsi_disk(disk);
1355 struct scsi_device *sdp = sdkp->device;
1356 struct scsi_sense_hdr *sshdr = NULL;
1357 int retval;
1358
1359 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1360
1361 /*
1362 * If the device is offline, don't send any commands - just pretend as
1363 * if the command failed. If the device ever comes back online, we
1364 * can deal with it then. It is only because of unrecoverable errors
1365 * that we would ever take a device offline in the first place.
1366 */
1367 if (!scsi_device_online(sdp)) {
1368 set_media_not_present(sdkp);
1369 goto out;
1370 }
1371
1372 /*
1373 * Using TEST_UNIT_READY enables differentiation between drive with
1374 * no cartridge loaded - NOT READY, drive with changed cartridge -
1375 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1376 *
1377 * Drives that auto spin down. eg iomega jaz 1G, will be started
1378 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1379 * sd_revalidate() is called.
1380 */
1381 retval = -ENODEV;
1382
1383 if (scsi_block_when_processing_errors(sdp)) {
1384 retval = scsi_autopm_get_device(sdp);
1385 if (retval)
1386 goto out;
1387
1388 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1389 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1390 sshdr);
1391 scsi_autopm_put_device(sdp);
1392 }
1393
1394 /* failed to execute TUR, assume media not present */
1395 if (host_byte(retval)) {
1396 set_media_not_present(sdkp);
1397 goto out;
1398 }
1399
1400 if (media_not_present(sdkp, sshdr))
1401 goto out;
1402
1403 /*
1404 * For removable scsi disk we have to recognise the presence
1405 * of a disk in the drive.
1406 */
1407 if (!sdkp->media_present)
1408 sdp->changed = 1;
1409 sdkp->media_present = 1;
1410 out:
1411 /*
1412 * sdp->changed is set under the following conditions:
1413 *
1414 * Medium present state has changed in either direction.
1415 * Device has indicated UNIT_ATTENTION.
1416 */
1417 kfree(sshdr);
1418 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1419 sdp->changed = 0;
1420 return retval;
1421 }
1422
1423 static int sd_sync_cache(struct scsi_disk *sdkp)
1424 {
1425 int retries, res;
1426 struct scsi_device *sdp = sdkp->device;
1427 struct scsi_sense_hdr sshdr;
1428
1429 if (!scsi_device_online(sdp))
1430 return -ENODEV;
1431
1432
1433 for (retries = 3; retries > 0; --retries) {
1434 unsigned char cmd[10] = { 0 };
1435
1436 cmd[0] = SYNCHRONIZE_CACHE;
1437 /*
1438 * Leave the rest of the command zero to indicate
1439 * flush everything.
1440 */
1441 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1442 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1443 if (res == 0)
1444 break;
1445 }
1446
1447 if (res) {
1448 sd_print_result(sdkp, res);
1449 if (driver_byte(res) & DRIVER_SENSE)
1450 sd_print_sense_hdr(sdkp, &sshdr);
1451 }
1452
1453 if (res)
1454 return -EIO;
1455 return 0;
1456 }
1457
1458 static void sd_rescan(struct device *dev)
1459 {
1460 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1461
1462 if (sdkp) {
1463 revalidate_disk(sdkp->disk);
1464 scsi_disk_put(sdkp);
1465 }
1466 }
1467
1468
1469 #ifdef CONFIG_COMPAT
1470 /*
1471 * This gets directly called from VFS. When the ioctl
1472 * is not recognized we go back to the other translation paths.
1473 */
1474 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1475 unsigned int cmd, unsigned long arg)
1476 {
1477 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1478 int ret;
1479
1480 ret = scsi_verify_blk_ioctl(bdev, cmd);
1481 if (ret < 0)
1482 return ret;
1483
1484 /*
1485 * If we are in the middle of error recovery, don't let anyone
1486 * else try and use this device. Also, if error recovery fails, it
1487 * may try and take the device offline, in which case all further
1488 * access to the device is prohibited.
1489 */
1490 if (!scsi_block_when_processing_errors(sdev))
1491 return -ENODEV;
1492
1493 if (sdev->host->hostt->compat_ioctl) {
1494 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1495
1496 return ret;
1497 }
1498
1499 /*
1500 * Let the static ioctl translation table take care of it.
1501 */
1502 return -ENOIOCTLCMD;
1503 }
1504 #endif
1505
1506 static const struct block_device_operations sd_fops = {
1507 .owner = THIS_MODULE,
1508 .open = sd_open,
1509 .release = sd_release,
1510 .ioctl = sd_ioctl,
1511 .getgeo = sd_getgeo,
1512 #ifdef CONFIG_COMPAT
1513 .compat_ioctl = sd_compat_ioctl,
1514 #endif
1515 .check_events = sd_check_events,
1516 .revalidate_disk = sd_revalidate_disk,
1517 .unlock_native_capacity = sd_unlock_native_capacity,
1518 };
1519
1520 /**
1521 * sd_eh_action - error handling callback
1522 * @scmd: sd-issued command that has failed
1523 * @eh_cmnd: The command that was sent during error handling
1524 * @eh_cmnd_len: Length of eh_cmnd in bytes
1525 * @eh_disp: The recovery disposition suggested by the midlayer
1526 *
1527 * This function is called by the SCSI midlayer upon completion of
1528 * an error handling command (TEST UNIT READY, START STOP UNIT,
1529 * etc.) The command sent to the device by the error handler is
1530 * stored in eh_cmnd. The result of sending the eh command is
1531 * passed in eh_disp.
1532 **/
1533 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1534 int eh_cmnd_len, int eh_disp)
1535 {
1536 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1537
1538 if (!scsi_device_online(scmd->device) ||
1539 !scsi_medium_access_command(scmd))
1540 return eh_disp;
1541
1542 /*
1543 * The device has timed out executing a medium access command.
1544 * However, the TEST UNIT READY command sent during error
1545 * handling completed successfully. Either the device is in the
1546 * process of recovering or has it suffered an internal failure
1547 * that prevents access to the storage medium.
1548 */
1549 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1550 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1551 sdkp->medium_access_timed_out++;
1552
1553 /*
1554 * If the device keeps failing read/write commands but TEST UNIT
1555 * READY always completes successfully we assume that medium
1556 * access is no longer possible and take the device offline.
1557 */
1558 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1559 scmd_printk(KERN_ERR, scmd,
1560 "Medium access timeout failure. Offlining disk!\n");
1561 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1562
1563 return FAILED;
1564 }
1565
1566 return eh_disp;
1567 }
1568
1569 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1570 {
1571 u64 start_lba = blk_rq_pos(scmd->request);
1572 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1573 u64 bad_lba;
1574 int info_valid;
1575 /*
1576 * resid is optional but mostly filled in. When it's unused,
1577 * its value is zero, so we assume the whole buffer transferred
1578 */
1579 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1580 unsigned int good_bytes;
1581
1582 if (scmd->request->cmd_type != REQ_TYPE_FS)
1583 return 0;
1584
1585 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1586 SCSI_SENSE_BUFFERSIZE,
1587 &bad_lba);
1588 if (!info_valid)
1589 return 0;
1590
1591 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1592 return 0;
1593
1594 if (scmd->device->sector_size < 512) {
1595 /* only legitimate sector_size here is 256 */
1596 start_lba <<= 1;
1597 end_lba <<= 1;
1598 } else {
1599 /* be careful ... don't want any overflows */
1600 u64 factor = scmd->device->sector_size / 512;
1601 do_div(start_lba, factor);
1602 do_div(end_lba, factor);
1603 }
1604
1605 /* The bad lba was reported incorrectly, we have no idea where
1606 * the error is.
1607 */
1608 if (bad_lba < start_lba || bad_lba >= end_lba)
1609 return 0;
1610
1611 /* This computation should always be done in terms of
1612 * the resolution of the device's medium.
1613 */
1614 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1615 return min(good_bytes, transferred);
1616 }
1617
1618 /**
1619 * sd_done - bottom half handler: called when the lower level
1620 * driver has completed (successfully or otherwise) a scsi command.
1621 * @SCpnt: mid-level's per command structure.
1622 *
1623 * Note: potentially run from within an ISR. Must not block.
1624 **/
1625 static int sd_done(struct scsi_cmnd *SCpnt)
1626 {
1627 int result = SCpnt->result;
1628 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1629 struct scsi_sense_hdr sshdr;
1630 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1631 struct request *req = SCpnt->request;
1632 int sense_valid = 0;
1633 int sense_deferred = 0;
1634 unsigned char op = SCpnt->cmnd[0];
1635 unsigned char unmap = SCpnt->cmnd[1] & 8;
1636
1637 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1638 if (!result) {
1639 good_bytes = blk_rq_bytes(req);
1640 scsi_set_resid(SCpnt, 0);
1641 } else {
1642 good_bytes = 0;
1643 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1644 }
1645 }
1646
1647 if (result) {
1648 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1649 if (sense_valid)
1650 sense_deferred = scsi_sense_is_deferred(&sshdr);
1651 }
1652 #ifdef CONFIG_SCSI_LOGGING
1653 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1654 if (sense_valid) {
1655 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1656 "sd_done: sb[respc,sk,asc,"
1657 "ascq]=%x,%x,%x,%x\n",
1658 sshdr.response_code,
1659 sshdr.sense_key, sshdr.asc,
1660 sshdr.ascq));
1661 }
1662 #endif
1663 if (driver_byte(result) != DRIVER_SENSE &&
1664 (!sense_valid || sense_deferred))
1665 goto out;
1666
1667 sdkp->medium_access_timed_out = 0;
1668
1669 switch (sshdr.sense_key) {
1670 case HARDWARE_ERROR:
1671 case MEDIUM_ERROR:
1672 good_bytes = sd_completed_bytes(SCpnt);
1673 break;
1674 case RECOVERED_ERROR:
1675 good_bytes = scsi_bufflen(SCpnt);
1676 break;
1677 case NO_SENSE:
1678 /* This indicates a false check condition, so ignore it. An
1679 * unknown amount of data was transferred so treat it as an
1680 * error.
1681 */
1682 scsi_print_sense("sd", SCpnt);
1683 SCpnt->result = 0;
1684 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1685 break;
1686 case ABORTED_COMMAND:
1687 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1688 good_bytes = sd_completed_bytes(SCpnt);
1689 break;
1690 case ILLEGAL_REQUEST:
1691 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1692 good_bytes = sd_completed_bytes(SCpnt);
1693 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1694 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1695 switch (op) {
1696 case UNMAP:
1697 sd_config_discard(sdkp, SD_LBP_DISABLE);
1698 break;
1699 case WRITE_SAME_16:
1700 case WRITE_SAME:
1701 if (unmap)
1702 sd_config_discard(sdkp, SD_LBP_DISABLE);
1703 else {
1704 sdkp->device->no_write_same = 1;
1705 sd_config_write_same(sdkp);
1706
1707 good_bytes = 0;
1708 req->__data_len = blk_rq_bytes(req);
1709 req->cmd_flags |= REQ_QUIET;
1710 }
1711 }
1712 }
1713 break;
1714 default:
1715 break;
1716 }
1717 out:
1718 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1719 sd_dif_complete(SCpnt, good_bytes);
1720
1721 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1722 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1723
1724 /* We have to print a failed command here as the
1725 * extended CDB gets freed before scsi_io_completion()
1726 * is called.
1727 */
1728 if (result)
1729 scsi_print_command(SCpnt);
1730
1731 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1732 SCpnt->cmnd = NULL;
1733 SCpnt->cmd_len = 0;
1734 }
1735
1736 return good_bytes;
1737 }
1738
1739 /*
1740 * spinup disk - called only in sd_revalidate_disk()
1741 */
1742 static void
1743 sd_spinup_disk(struct scsi_disk *sdkp)
1744 {
1745 unsigned char cmd[10];
1746 unsigned long spintime_expire = 0;
1747 int retries, spintime;
1748 unsigned int the_result;
1749 struct scsi_sense_hdr sshdr;
1750 int sense_valid = 0;
1751
1752 spintime = 0;
1753
1754 /* Spin up drives, as required. Only do this at boot time */
1755 /* Spinup needs to be done for module loads too. */
1756 do {
1757 retries = 0;
1758
1759 do {
1760 cmd[0] = TEST_UNIT_READY;
1761 memset((void *) &cmd[1], 0, 9);
1762
1763 the_result = scsi_execute_req(sdkp->device, cmd,
1764 DMA_NONE, NULL, 0,
1765 &sshdr, SD_TIMEOUT,
1766 SD_MAX_RETRIES, NULL);
1767
1768 /*
1769 * If the drive has indicated to us that it
1770 * doesn't have any media in it, don't bother
1771 * with any more polling.
1772 */
1773 if (media_not_present(sdkp, &sshdr))
1774 return;
1775
1776 if (the_result)
1777 sense_valid = scsi_sense_valid(&sshdr);
1778 retries++;
1779 } while (retries < 3 &&
1780 (!scsi_status_is_good(the_result) ||
1781 ((driver_byte(the_result) & DRIVER_SENSE) &&
1782 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1783
1784 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1785 /* no sense, TUR either succeeded or failed
1786 * with a status error */
1787 if(!spintime && !scsi_status_is_good(the_result)) {
1788 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1789 sd_print_result(sdkp, the_result);
1790 }
1791 break;
1792 }
1793
1794 /*
1795 * The device does not want the automatic start to be issued.
1796 */
1797 if (sdkp->device->no_start_on_add)
1798 break;
1799
1800 if (sense_valid && sshdr.sense_key == NOT_READY) {
1801 if (sshdr.asc == 4 && sshdr.ascq == 3)
1802 break; /* manual intervention required */
1803 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1804 break; /* standby */
1805 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1806 break; /* unavailable */
1807 /*
1808 * Issue command to spin up drive when not ready
1809 */
1810 if (!spintime) {
1811 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1812 cmd[0] = START_STOP;
1813 cmd[1] = 1; /* Return immediately */
1814 memset((void *) &cmd[2], 0, 8);
1815 cmd[4] = 1; /* Start spin cycle */
1816 if (sdkp->device->start_stop_pwr_cond)
1817 cmd[4] |= 1 << 4;
1818 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1819 NULL, 0, &sshdr,
1820 SD_TIMEOUT, SD_MAX_RETRIES,
1821 NULL);
1822 spintime_expire = jiffies + 100 * HZ;
1823 spintime = 1;
1824 }
1825 /* Wait 1 second for next try */
1826 msleep(1000);
1827 printk(".");
1828
1829 /*
1830 * Wait for USB flash devices with slow firmware.
1831 * Yes, this sense key/ASC combination shouldn't
1832 * occur here. It's characteristic of these devices.
1833 */
1834 } else if (sense_valid &&
1835 sshdr.sense_key == UNIT_ATTENTION &&
1836 sshdr.asc == 0x28) {
1837 if (!spintime) {
1838 spintime_expire = jiffies + 5 * HZ;
1839 spintime = 1;
1840 }
1841 /* Wait 1 second for next try */
1842 msleep(1000);
1843 } else {
1844 /* we don't understand the sense code, so it's
1845 * probably pointless to loop */
1846 if(!spintime) {
1847 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1848 sd_print_sense_hdr(sdkp, &sshdr);
1849 }
1850 break;
1851 }
1852
1853 } while (spintime && time_before_eq(jiffies, spintime_expire));
1854
1855 if (spintime) {
1856 if (scsi_status_is_good(the_result))
1857 printk("ready\n");
1858 else
1859 printk("not responding...\n");
1860 }
1861 }
1862
1863
1864 /*
1865 * Determine whether disk supports Data Integrity Field.
1866 */
1867 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1868 {
1869 struct scsi_device *sdp = sdkp->device;
1870 u8 type;
1871 int ret = 0;
1872
1873 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1874 return ret;
1875
1876 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1877
1878 if (type > SD_DIF_TYPE3_PROTECTION)
1879 ret = -ENODEV;
1880 else if (scsi_host_dif_capable(sdp->host, type))
1881 ret = 1;
1882
1883 if (sdkp->first_scan || type != sdkp->protection_type)
1884 switch (ret) {
1885 case -ENODEV:
1886 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1887 " protection type %u. Disabling disk!\n",
1888 type);
1889 break;
1890 case 1:
1891 sd_printk(KERN_NOTICE, sdkp,
1892 "Enabling DIF Type %u protection\n", type);
1893 break;
1894 case 0:
1895 sd_printk(KERN_NOTICE, sdkp,
1896 "Disabling DIF Type %u protection\n", type);
1897 break;
1898 }
1899
1900 sdkp->protection_type = type;
1901
1902 return ret;
1903 }
1904
1905 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1906 struct scsi_sense_hdr *sshdr, int sense_valid,
1907 int the_result)
1908 {
1909 sd_print_result(sdkp, the_result);
1910 if (driver_byte(the_result) & DRIVER_SENSE)
1911 sd_print_sense_hdr(sdkp, sshdr);
1912 else
1913 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1914
1915 /*
1916 * Set dirty bit for removable devices if not ready -
1917 * sometimes drives will not report this properly.
1918 */
1919 if (sdp->removable &&
1920 sense_valid && sshdr->sense_key == NOT_READY)
1921 set_media_not_present(sdkp);
1922
1923 /*
1924 * We used to set media_present to 0 here to indicate no media
1925 * in the drive, but some drives fail read capacity even with
1926 * media present, so we can't do that.
1927 */
1928 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1929 }
1930
1931 #define RC16_LEN 32
1932 #if RC16_LEN > SD_BUF_SIZE
1933 #error RC16_LEN must not be more than SD_BUF_SIZE
1934 #endif
1935
1936 #define READ_CAPACITY_RETRIES_ON_RESET 10
1937
1938 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1939 unsigned char *buffer)
1940 {
1941 unsigned char cmd[16];
1942 struct scsi_sense_hdr sshdr;
1943 int sense_valid = 0;
1944 int the_result;
1945 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1946 unsigned int alignment;
1947 unsigned long long lba;
1948 unsigned sector_size;
1949
1950 if (sdp->no_read_capacity_16)
1951 return -EINVAL;
1952
1953 do {
1954 memset(cmd, 0, 16);
1955 cmd[0] = SERVICE_ACTION_IN;
1956 cmd[1] = SAI_READ_CAPACITY_16;
1957 cmd[13] = RC16_LEN;
1958 memset(buffer, 0, RC16_LEN);
1959
1960 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1961 buffer, RC16_LEN, &sshdr,
1962 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1963
1964 if (media_not_present(sdkp, &sshdr))
1965 return -ENODEV;
1966
1967 if (the_result) {
1968 sense_valid = scsi_sense_valid(&sshdr);
1969 if (sense_valid &&
1970 sshdr.sense_key == ILLEGAL_REQUEST &&
1971 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1972 sshdr.ascq == 0x00)
1973 /* Invalid Command Operation Code or
1974 * Invalid Field in CDB, just retry
1975 * silently with RC10 */
1976 return -EINVAL;
1977 if (sense_valid &&
1978 sshdr.sense_key == UNIT_ATTENTION &&
1979 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1980 /* Device reset might occur several times,
1981 * give it one more chance */
1982 if (--reset_retries > 0)
1983 continue;
1984 }
1985 retries--;
1986
1987 } while (the_result && retries);
1988
1989 if (the_result) {
1990 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1991 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1992 return -EINVAL;
1993 }
1994
1995 sector_size = get_unaligned_be32(&buffer[8]);
1996 lba = get_unaligned_be64(&buffer[0]);
1997
1998 if (sd_read_protection_type(sdkp, buffer) < 0) {
1999 sdkp->capacity = 0;
2000 return -ENODEV;
2001 }
2002
2003 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2004 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2005 "kernel compiled with support for large block "
2006 "devices.\n");
2007 sdkp->capacity = 0;
2008 return -EOVERFLOW;
2009 }
2010
2011 /* Logical blocks per physical block exponent */
2012 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2013
2014 /* Lowest aligned logical block */
2015 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2016 blk_queue_alignment_offset(sdp->request_queue, alignment);
2017 if (alignment && sdkp->first_scan)
2018 sd_printk(KERN_NOTICE, sdkp,
2019 "physical block alignment offset: %u\n", alignment);
2020
2021 if (buffer[14] & 0x80) { /* LBPME */
2022 sdkp->lbpme = 1;
2023
2024 if (buffer[14] & 0x40) /* LBPRZ */
2025 sdkp->lbprz = 1;
2026
2027 sd_config_discard(sdkp, SD_LBP_WS16);
2028 }
2029
2030 sdkp->capacity = lba + 1;
2031 return sector_size;
2032 }
2033
2034 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2035 unsigned char *buffer)
2036 {
2037 unsigned char cmd[16];
2038 struct scsi_sense_hdr sshdr;
2039 int sense_valid = 0;
2040 int the_result;
2041 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2042 sector_t lba;
2043 unsigned sector_size;
2044
2045 do {
2046 cmd[0] = READ_CAPACITY;
2047 memset(&cmd[1], 0, 9);
2048 memset(buffer, 0, 8);
2049
2050 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2051 buffer, 8, &sshdr,
2052 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2053
2054 if (media_not_present(sdkp, &sshdr))
2055 return -ENODEV;
2056
2057 if (the_result) {
2058 sense_valid = scsi_sense_valid(&sshdr);
2059 if (sense_valid &&
2060 sshdr.sense_key == UNIT_ATTENTION &&
2061 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2062 /* Device reset might occur several times,
2063 * give it one more chance */
2064 if (--reset_retries > 0)
2065 continue;
2066 }
2067 retries--;
2068
2069 } while (the_result && retries);
2070
2071 if (the_result) {
2072 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2073 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2074 return -EINVAL;
2075 }
2076
2077 sector_size = get_unaligned_be32(&buffer[4]);
2078 lba = get_unaligned_be32(&buffer[0]);
2079
2080 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2081 /* Some buggy (usb cardreader) devices return an lba of
2082 0xffffffff when the want to report a size of 0 (with
2083 which they really mean no media is present) */
2084 sdkp->capacity = 0;
2085 sdkp->physical_block_size = sector_size;
2086 return sector_size;
2087 }
2088
2089 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2090 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2091 "kernel compiled with support for large block "
2092 "devices.\n");
2093 sdkp->capacity = 0;
2094 return -EOVERFLOW;
2095 }
2096
2097 sdkp->capacity = lba + 1;
2098 sdkp->physical_block_size = sector_size;
2099 return sector_size;
2100 }
2101
2102 static int sd_try_rc16_first(struct scsi_device *sdp)
2103 {
2104 if (sdp->host->max_cmd_len < 16)
2105 return 0;
2106 if (sdp->try_rc_10_first)
2107 return 0;
2108 if (sdp->scsi_level > SCSI_SPC_2)
2109 return 1;
2110 if (scsi_device_protection(sdp))
2111 return 1;
2112 return 0;
2113 }
2114
2115 /*
2116 * read disk capacity
2117 */
2118 static void
2119 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2120 {
2121 int sector_size;
2122 struct scsi_device *sdp = sdkp->device;
2123 sector_t old_capacity = sdkp->capacity;
2124
2125 if (sd_try_rc16_first(sdp)) {
2126 sector_size = read_capacity_16(sdkp, sdp, buffer);
2127 if (sector_size == -EOVERFLOW)
2128 goto got_data;
2129 if (sector_size == -ENODEV)
2130 return;
2131 if (sector_size < 0)
2132 sector_size = read_capacity_10(sdkp, sdp, buffer);
2133 if (sector_size < 0)
2134 return;
2135 } else {
2136 sector_size = read_capacity_10(sdkp, sdp, buffer);
2137 if (sector_size == -EOVERFLOW)
2138 goto got_data;
2139 if (sector_size < 0)
2140 return;
2141 if ((sizeof(sdkp->capacity) > 4) &&
2142 (sdkp->capacity > 0xffffffffULL)) {
2143 int old_sector_size = sector_size;
2144 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2145 "Trying to use READ CAPACITY(16).\n");
2146 sector_size = read_capacity_16(sdkp, sdp, buffer);
2147 if (sector_size < 0) {
2148 sd_printk(KERN_NOTICE, sdkp,
2149 "Using 0xffffffff as device size\n");
2150 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2151 sector_size = old_sector_size;
2152 goto got_data;
2153 }
2154 }
2155 }
2156
2157 /* Some devices are known to return the total number of blocks,
2158 * not the highest block number. Some devices have versions
2159 * which do this and others which do not. Some devices we might
2160 * suspect of doing this but we don't know for certain.
2161 *
2162 * If we know the reported capacity is wrong, decrement it. If
2163 * we can only guess, then assume the number of blocks is even
2164 * (usually true but not always) and err on the side of lowering
2165 * the capacity.
2166 */
2167 if (sdp->fix_capacity ||
2168 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2169 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2170 "from its reported value: %llu\n",
2171 (unsigned long long) sdkp->capacity);
2172 --sdkp->capacity;
2173 }
2174
2175 got_data:
2176 if (sector_size == 0) {
2177 sector_size = 512;
2178 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2179 "assuming 512.\n");
2180 }
2181
2182 if (sector_size != 512 &&
2183 sector_size != 1024 &&
2184 sector_size != 2048 &&
2185 sector_size != 4096 &&
2186 sector_size != 256) {
2187 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2188 sector_size);
2189 /*
2190 * The user might want to re-format the drive with
2191 * a supported sectorsize. Once this happens, it
2192 * would be relatively trivial to set the thing up.
2193 * For this reason, we leave the thing in the table.
2194 */
2195 sdkp->capacity = 0;
2196 /*
2197 * set a bogus sector size so the normal read/write
2198 * logic in the block layer will eventually refuse any
2199 * request on this device without tripping over power
2200 * of two sector size assumptions
2201 */
2202 sector_size = 512;
2203 }
2204 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2205
2206 {
2207 char cap_str_2[10], cap_str_10[10];
2208 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2209
2210 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2211 sizeof(cap_str_2));
2212 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2213 sizeof(cap_str_10));
2214
2215 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2216 sd_printk(KERN_NOTICE, sdkp,
2217 "%llu %d-byte logical blocks: (%s/%s)\n",
2218 (unsigned long long)sdkp->capacity,
2219 sector_size, cap_str_10, cap_str_2);
2220
2221 if (sdkp->physical_block_size != sector_size)
2222 sd_printk(KERN_NOTICE, sdkp,
2223 "%u-byte physical blocks\n",
2224 sdkp->physical_block_size);
2225 }
2226 }
2227
2228 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2229
2230 /* Rescale capacity to 512-byte units */
2231 if (sector_size == 4096)
2232 sdkp->capacity <<= 3;
2233 else if (sector_size == 2048)
2234 sdkp->capacity <<= 2;
2235 else if (sector_size == 1024)
2236 sdkp->capacity <<= 1;
2237 else if (sector_size == 256)
2238 sdkp->capacity >>= 1;
2239
2240 blk_queue_physical_block_size(sdp->request_queue,
2241 sdkp->physical_block_size);
2242 sdkp->device->sector_size = sector_size;
2243 }
2244
2245 /* called with buffer of length 512 */
2246 static inline int
2247 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2248 unsigned char *buffer, int len, struct scsi_mode_data *data,
2249 struct scsi_sense_hdr *sshdr)
2250 {
2251 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2252 SD_TIMEOUT, SD_MAX_RETRIES, data,
2253 sshdr);
2254 }
2255
2256 /*
2257 * read write protect setting, if possible - called only in sd_revalidate_disk()
2258 * called with buffer of length SD_BUF_SIZE
2259 */
2260 static void
2261 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2262 {
2263 int res;
2264 struct scsi_device *sdp = sdkp->device;
2265 struct scsi_mode_data data;
2266 int old_wp = sdkp->write_prot;
2267
2268 set_disk_ro(sdkp->disk, 0);
2269 if (sdp->skip_ms_page_3f) {
2270 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2271 return;
2272 }
2273
2274 if (sdp->use_192_bytes_for_3f) {
2275 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2276 } else {
2277 /*
2278 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2279 * We have to start carefully: some devices hang if we ask
2280 * for more than is available.
2281 */
2282 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2283
2284 /*
2285 * Second attempt: ask for page 0 When only page 0 is
2286 * implemented, a request for page 3F may return Sense Key
2287 * 5: Illegal Request, Sense Code 24: Invalid field in
2288 * CDB.
2289 */
2290 if (!scsi_status_is_good(res))
2291 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2292
2293 /*
2294 * Third attempt: ask 255 bytes, as we did earlier.
2295 */
2296 if (!scsi_status_is_good(res))
2297 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2298 &data, NULL);
2299 }
2300
2301 if (!scsi_status_is_good(res)) {
2302 sd_printk(KERN_WARNING, sdkp,
2303 "Test WP failed, assume Write Enabled\n");
2304 } else {
2305 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2306 set_disk_ro(sdkp->disk, sdkp->write_prot);
2307 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2308 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2309 sdkp->write_prot ? "on" : "off");
2310 sd_printk(KERN_DEBUG, sdkp,
2311 "Mode Sense: %02x %02x %02x %02x\n",
2312 buffer[0], buffer[1], buffer[2], buffer[3]);
2313 }
2314 }
2315 }
2316
2317 /*
2318 * sd_read_cache_type - called only from sd_revalidate_disk()
2319 * called with buffer of length SD_BUF_SIZE
2320 */
2321 static void
2322 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2323 {
2324 int len = 0, res;
2325 struct scsi_device *sdp = sdkp->device;
2326
2327 int dbd;
2328 int modepage;
2329 int first_len;
2330 struct scsi_mode_data data;
2331 struct scsi_sense_hdr sshdr;
2332 int old_wce = sdkp->WCE;
2333 int old_rcd = sdkp->RCD;
2334 int old_dpofua = sdkp->DPOFUA;
2335
2336
2337 if (sdkp->cache_override)
2338 return;
2339
2340 first_len = 4;
2341 if (sdp->skip_ms_page_8) {
2342 if (sdp->type == TYPE_RBC)
2343 goto defaults;
2344 else {
2345 if (sdp->skip_ms_page_3f)
2346 goto defaults;
2347 modepage = 0x3F;
2348 if (sdp->use_192_bytes_for_3f)
2349 first_len = 192;
2350 dbd = 0;
2351 }
2352 } else if (sdp->type == TYPE_RBC) {
2353 modepage = 6;
2354 dbd = 8;
2355 } else {
2356 modepage = 8;
2357 dbd = 0;
2358 }
2359
2360 /* cautiously ask */
2361 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2362 &data, &sshdr);
2363
2364 if (!scsi_status_is_good(res))
2365 goto bad_sense;
2366
2367 if (!data.header_length) {
2368 modepage = 6;
2369 first_len = 0;
2370 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2371 }
2372
2373 /* that went OK, now ask for the proper length */
2374 len = data.length;
2375
2376 /*
2377 * We're only interested in the first three bytes, actually.
2378 * But the data cache page is defined for the first 20.
2379 */
2380 if (len < 3)
2381 goto bad_sense;
2382 else if (len > SD_BUF_SIZE) {
2383 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2384 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2385 len = SD_BUF_SIZE;
2386 }
2387 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2388 len = 192;
2389
2390 /* Get the data */
2391 if (len > first_len)
2392 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2393 &data, &sshdr);
2394
2395 if (scsi_status_is_good(res)) {
2396 int offset = data.header_length + data.block_descriptor_length;
2397
2398 while (offset < len) {
2399 u8 page_code = buffer[offset] & 0x3F;
2400 u8 spf = buffer[offset] & 0x40;
2401
2402 if (page_code == 8 || page_code == 6) {
2403 /* We're interested only in the first 3 bytes.
2404 */
2405 if (len - offset <= 2) {
2406 sd_printk(KERN_ERR, sdkp, "Incomplete "
2407 "mode parameter data\n");
2408 goto defaults;
2409 } else {
2410 modepage = page_code;
2411 goto Page_found;
2412 }
2413 } else {
2414 /* Go to the next page */
2415 if (spf && len - offset > 3)
2416 offset += 4 + (buffer[offset+2] << 8) +
2417 buffer[offset+3];
2418 else if (!spf && len - offset > 1)
2419 offset += 2 + buffer[offset+1];
2420 else {
2421 sd_printk(KERN_ERR, sdkp, "Incomplete "
2422 "mode parameter data\n");
2423 goto defaults;
2424 }
2425 }
2426 }
2427
2428 if (modepage == 0x3F) {
2429 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2430 "present\n");
2431 goto defaults;
2432 } else if ((buffer[offset] & 0x3f) != modepage) {
2433 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2434 goto defaults;
2435 }
2436 Page_found:
2437 if (modepage == 8) {
2438 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2439 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2440 } else {
2441 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2442 sdkp->RCD = 0;
2443 }
2444
2445 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2446 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2447 sd_printk(KERN_NOTICE, sdkp,
2448 "Uses READ/WRITE(6), disabling FUA\n");
2449 sdkp->DPOFUA = 0;
2450 }
2451
2452 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2453 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2454 sd_printk(KERN_NOTICE, sdkp,
2455 "Write cache: %s, read cache: %s, %s\n",
2456 sdkp->WCE ? "enabled" : "disabled",
2457 sdkp->RCD ? "disabled" : "enabled",
2458 sdkp->DPOFUA ? "supports DPO and FUA"
2459 : "doesn't support DPO or FUA");
2460
2461 return;
2462 }
2463
2464 bad_sense:
2465 if (scsi_sense_valid(&sshdr) &&
2466 sshdr.sense_key == ILLEGAL_REQUEST &&
2467 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2468 /* Invalid field in CDB */
2469 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2470 else
2471 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2472
2473 defaults:
2474 if (sdp->wce_default_on) {
2475 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2476 sdkp->WCE = 1;
2477 } else {
2478 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2479 sdkp->WCE = 0;
2480 }
2481 sdkp->RCD = 0;
2482 sdkp->DPOFUA = 0;
2483 }
2484
2485 /*
2486 * The ATO bit indicates whether the DIF application tag is available
2487 * for use by the operating system.
2488 */
2489 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2490 {
2491 int res, offset;
2492 struct scsi_device *sdp = sdkp->device;
2493 struct scsi_mode_data data;
2494 struct scsi_sense_hdr sshdr;
2495
2496 if (sdp->type != TYPE_DISK)
2497 return;
2498
2499 if (sdkp->protection_type == 0)
2500 return;
2501
2502 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2503 SD_MAX_RETRIES, &data, &sshdr);
2504
2505 if (!scsi_status_is_good(res) || !data.header_length ||
2506 data.length < 6) {
2507 sd_printk(KERN_WARNING, sdkp,
2508 "getting Control mode page failed, assume no ATO\n");
2509
2510 if (scsi_sense_valid(&sshdr))
2511 sd_print_sense_hdr(sdkp, &sshdr);
2512
2513 return;
2514 }
2515
2516 offset = data.header_length + data.block_descriptor_length;
2517
2518 if ((buffer[offset] & 0x3f) != 0x0a) {
2519 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2520 return;
2521 }
2522
2523 if ((buffer[offset + 5] & 0x80) == 0)
2524 return;
2525
2526 sdkp->ATO = 1;
2527
2528 return;
2529 }
2530
2531 /**
2532 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2533 * @disk: disk to query
2534 */
2535 static void sd_read_block_limits(struct scsi_disk *sdkp)
2536 {
2537 unsigned int sector_sz = sdkp->device->sector_size;
2538 const int vpd_len = 64;
2539 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2540
2541 if (!buffer ||
2542 /* Block Limits VPD */
2543 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2544 goto out;
2545
2546 blk_queue_io_min(sdkp->disk->queue,
2547 get_unaligned_be16(&buffer[6]) * sector_sz);
2548 blk_queue_io_opt(sdkp->disk->queue,
2549 get_unaligned_be32(&buffer[12]) * sector_sz);
2550
2551 if (buffer[3] == 0x3c) {
2552 unsigned int lba_count, desc_count;
2553
2554 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2555
2556 if (!sdkp->lbpme)
2557 goto out;
2558
2559 lba_count = get_unaligned_be32(&buffer[20]);
2560 desc_count = get_unaligned_be32(&buffer[24]);
2561
2562 if (lba_count && desc_count)
2563 sdkp->max_unmap_blocks = lba_count;
2564
2565 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2566
2567 if (buffer[32] & 0x80)
2568 sdkp->unmap_alignment =
2569 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2570
2571 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2572
2573 if (sdkp->max_unmap_blocks)
2574 sd_config_discard(sdkp, SD_LBP_UNMAP);
2575 else
2576 sd_config_discard(sdkp, SD_LBP_WS16);
2577
2578 } else { /* LBP VPD page tells us what to use */
2579
2580 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2581 sd_config_discard(sdkp, SD_LBP_UNMAP);
2582 else if (sdkp->lbpws)
2583 sd_config_discard(sdkp, SD_LBP_WS16);
2584 else if (sdkp->lbpws10)
2585 sd_config_discard(sdkp, SD_LBP_WS10);
2586 else
2587 sd_config_discard(sdkp, SD_LBP_DISABLE);
2588 }
2589 }
2590
2591 out:
2592 kfree(buffer);
2593 }
2594
2595 /**
2596 * sd_read_block_characteristics - Query block dev. characteristics
2597 * @disk: disk to query
2598 */
2599 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2600 {
2601 unsigned char *buffer;
2602 u16 rot;
2603 const int vpd_len = 64;
2604
2605 buffer = kmalloc(vpd_len, GFP_KERNEL);
2606
2607 if (!buffer ||
2608 /* Block Device Characteristics VPD */
2609 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2610 goto out;
2611
2612 rot = get_unaligned_be16(&buffer[4]);
2613
2614 if (rot == 1)
2615 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2616
2617 out:
2618 kfree(buffer);
2619 }
2620
2621 /**
2622 * sd_read_block_provisioning - Query provisioning VPD page
2623 * @disk: disk to query
2624 */
2625 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2626 {
2627 unsigned char *buffer;
2628 const int vpd_len = 8;
2629
2630 if (sdkp->lbpme == 0)
2631 return;
2632
2633 buffer = kmalloc(vpd_len, GFP_KERNEL);
2634
2635 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2636 goto out;
2637
2638 sdkp->lbpvpd = 1;
2639 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2640 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2641 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2642
2643 out:
2644 kfree(buffer);
2645 }
2646
2647 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2648 {
2649 if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2650 WRITE_SAME_16))
2651 sdkp->ws16 = 1;
2652 }
2653
2654 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2655 {
2656 /*
2657 * Although VPD inquiries can go to SCSI-2 type devices,
2658 * some USB ones crash on receiving them, and the pages
2659 * we currently ask for are for SPC-3 and beyond
2660 */
2661 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2662 return 1;
2663 return 0;
2664 }
2665
2666 /**
2667 * sd_revalidate_disk - called the first time a new disk is seen,
2668 * performs disk spin up, read_capacity, etc.
2669 * @disk: struct gendisk we care about
2670 **/
2671 static int sd_revalidate_disk(struct gendisk *disk)
2672 {
2673 struct scsi_disk *sdkp = scsi_disk(disk);
2674 struct scsi_device *sdp = sdkp->device;
2675 unsigned char *buffer;
2676 unsigned flush = 0;
2677
2678 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2679 "sd_revalidate_disk\n"));
2680
2681 /*
2682 * If the device is offline, don't try and read capacity or any
2683 * of the other niceties.
2684 */
2685 if (!scsi_device_online(sdp))
2686 goto out;
2687
2688 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2689 if (!buffer) {
2690 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2691 "allocation failure.\n");
2692 goto out;
2693 }
2694
2695 sd_spinup_disk(sdkp);
2696
2697 /*
2698 * Without media there is no reason to ask; moreover, some devices
2699 * react badly if we do.
2700 */
2701 if (sdkp->media_present) {
2702 sd_read_capacity(sdkp, buffer);
2703
2704 if (sd_try_extended_inquiry(sdp)) {
2705 sd_read_block_provisioning(sdkp);
2706 sd_read_block_limits(sdkp);
2707 sd_read_block_characteristics(sdkp);
2708 }
2709
2710 sd_read_write_protect_flag(sdkp, buffer);
2711 sd_read_cache_type(sdkp, buffer);
2712 sd_read_app_tag_own(sdkp, buffer);
2713 sd_read_write_same(sdkp, buffer);
2714 }
2715
2716 sdkp->first_scan = 0;
2717
2718 /*
2719 * We now have all cache related info, determine how we deal
2720 * with flush requests.
2721 */
2722 if (sdkp->WCE) {
2723 flush |= REQ_FLUSH;
2724 if (sdkp->DPOFUA)
2725 flush |= REQ_FUA;
2726 }
2727
2728 blk_queue_flush(sdkp->disk->queue, flush);
2729
2730 set_capacity(disk, sdkp->capacity);
2731 sd_config_write_same(sdkp);
2732 kfree(buffer);
2733
2734 out:
2735 return 0;
2736 }
2737
2738 /**
2739 * sd_unlock_native_capacity - unlock native capacity
2740 * @disk: struct gendisk to set capacity for
2741 *
2742 * Block layer calls this function if it detects that partitions
2743 * on @disk reach beyond the end of the device. If the SCSI host
2744 * implements ->unlock_native_capacity() method, it's invoked to
2745 * give it a chance to adjust the device capacity.
2746 *
2747 * CONTEXT:
2748 * Defined by block layer. Might sleep.
2749 */
2750 static void sd_unlock_native_capacity(struct gendisk *disk)
2751 {
2752 struct scsi_device *sdev = scsi_disk(disk)->device;
2753
2754 if (sdev->host->hostt->unlock_native_capacity)
2755 sdev->host->hostt->unlock_native_capacity(sdev);
2756 }
2757
2758 /**
2759 * sd_format_disk_name - format disk name
2760 * @prefix: name prefix - ie. "sd" for SCSI disks
2761 * @index: index of the disk to format name for
2762 * @buf: output buffer
2763 * @buflen: length of the output buffer
2764 *
2765 * SCSI disk names starts at sda. The 26th device is sdz and the
2766 * 27th is sdaa. The last one for two lettered suffix is sdzz
2767 * which is followed by sdaaa.
2768 *
2769 * This is basically 26 base counting with one extra 'nil' entry
2770 * at the beginning from the second digit on and can be
2771 * determined using similar method as 26 base conversion with the
2772 * index shifted -1 after each digit is computed.
2773 *
2774 * CONTEXT:
2775 * Don't care.
2776 *
2777 * RETURNS:
2778 * 0 on success, -errno on failure.
2779 */
2780 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2781 {
2782 const int base = 'z' - 'a' + 1;
2783 char *begin = buf + strlen(prefix);
2784 char *end = buf + buflen;
2785 char *p;
2786 int unit;
2787
2788 p = end - 1;
2789 *p = '\0';
2790 unit = base;
2791 do {
2792 if (p == begin)
2793 return -EINVAL;
2794 *--p = 'a' + (index % unit);
2795 index = (index / unit) - 1;
2796 } while (index >= 0);
2797
2798 memmove(begin, p, end - p);
2799 memcpy(buf, prefix, strlen(prefix));
2800
2801 return 0;
2802 }
2803
2804 /*
2805 * The asynchronous part of sd_probe
2806 */
2807 static void sd_probe_async(void *data, async_cookie_t cookie)
2808 {
2809 struct scsi_disk *sdkp = data;
2810 struct scsi_device *sdp;
2811 struct gendisk *gd;
2812 u32 index;
2813 struct device *dev;
2814
2815 sdp = sdkp->device;
2816 gd = sdkp->disk;
2817 index = sdkp->index;
2818 dev = &sdp->sdev_gendev;
2819
2820 gd->major = sd_major((index & 0xf0) >> 4);
2821 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2822 gd->minors = SD_MINORS;
2823
2824 gd->fops = &sd_fops;
2825 gd->private_data = &sdkp->driver;
2826 gd->queue = sdkp->device->request_queue;
2827
2828 /* defaults, until the device tells us otherwise */
2829 sdp->sector_size = 512;
2830 sdkp->capacity = 0;
2831 sdkp->media_present = 1;
2832 sdkp->write_prot = 0;
2833 sdkp->cache_override = 0;
2834 sdkp->WCE = 0;
2835 sdkp->RCD = 0;
2836 sdkp->ATO = 0;
2837 sdkp->first_scan = 1;
2838 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2839
2840 sd_revalidate_disk(gd);
2841
2842 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2843 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2844
2845 gd->driverfs_dev = &sdp->sdev_gendev;
2846 gd->flags = GENHD_FL_EXT_DEVT;
2847 if (sdp->removable) {
2848 gd->flags |= GENHD_FL_REMOVABLE;
2849 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2850 }
2851
2852 add_disk(gd);
2853 if (sdkp->capacity)
2854 sd_dif_config_host(sdkp);
2855
2856 sd_revalidate_disk(gd);
2857
2858 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2859 sdp->removable ? "removable " : "");
2860 scsi_autopm_put_device(sdp);
2861 put_device(&sdkp->dev);
2862 }
2863
2864 /**
2865 * sd_probe - called during driver initialization and whenever a
2866 * new scsi device is attached to the system. It is called once
2867 * for each scsi device (not just disks) present.
2868 * @dev: pointer to device object
2869 *
2870 * Returns 0 if successful (or not interested in this scsi device
2871 * (e.g. scanner)); 1 when there is an error.
2872 *
2873 * Note: this function is invoked from the scsi mid-level.
2874 * This function sets up the mapping between a given
2875 * <host,channel,id,lun> (found in sdp) and new device name
2876 * (e.g. /dev/sda). More precisely it is the block device major
2877 * and minor number that is chosen here.
2878 *
2879 * Assume sd_probe is not re-entrant (for time being)
2880 * Also think about sd_probe() and sd_remove() running coincidentally.
2881 **/
2882 static int sd_probe(struct device *dev)
2883 {
2884 struct scsi_device *sdp = to_scsi_device(dev);
2885 struct scsi_disk *sdkp;
2886 struct gendisk *gd;
2887 int index;
2888 int error;
2889
2890 error = -ENODEV;
2891 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2892 goto out;
2893
2894 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2895 "sd_probe\n"));
2896
2897 error = -ENOMEM;
2898 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2899 if (!sdkp)
2900 goto out;
2901
2902 gd = alloc_disk(SD_MINORS);
2903 if (!gd)
2904 goto out_free;
2905
2906 do {
2907 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2908 goto out_put;
2909
2910 spin_lock(&sd_index_lock);
2911 error = ida_get_new(&sd_index_ida, &index);
2912 spin_unlock(&sd_index_lock);
2913 } while (error == -EAGAIN);
2914
2915 if (error) {
2916 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2917 goto out_put;
2918 }
2919
2920 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2921 if (error) {
2922 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2923 goto out_free_index;
2924 }
2925
2926 sdkp->device = sdp;
2927 sdkp->driver = &sd_template;
2928 sdkp->disk = gd;
2929 sdkp->index = index;
2930 atomic_set(&sdkp->openers, 0);
2931 atomic_set(&sdkp->device->ioerr_cnt, 0);
2932
2933 if (!sdp->request_queue->rq_timeout) {
2934 if (sdp->type != TYPE_MOD)
2935 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2936 else
2937 blk_queue_rq_timeout(sdp->request_queue,
2938 SD_MOD_TIMEOUT);
2939 }
2940
2941 device_initialize(&sdkp->dev);
2942 sdkp->dev.parent = dev;
2943 sdkp->dev.class = &sd_disk_class;
2944 dev_set_name(&sdkp->dev, dev_name(dev));
2945
2946 if (device_add(&sdkp->dev))
2947 goto out_free_index;
2948
2949 get_device(dev);
2950 dev_set_drvdata(dev, sdkp);
2951
2952 get_device(&sdkp->dev); /* prevent release before async_schedule */
2953 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2954
2955 return 0;
2956
2957 out_free_index:
2958 spin_lock(&sd_index_lock);
2959 ida_remove(&sd_index_ida, index);
2960 spin_unlock(&sd_index_lock);
2961 out_put:
2962 put_disk(gd);
2963 out_free:
2964 kfree(sdkp);
2965 out:
2966 return error;
2967 }
2968
2969 /**
2970 * sd_remove - called whenever a scsi disk (previously recognized by
2971 * sd_probe) is detached from the system. It is called (potentially
2972 * multiple times) during sd module unload.
2973 * @sdp: pointer to mid level scsi device object
2974 *
2975 * Note: this function is invoked from the scsi mid-level.
2976 * This function potentially frees up a device name (e.g. /dev/sdc)
2977 * that could be re-used by a subsequent sd_probe().
2978 * This function is not called when the built-in sd driver is "exit-ed".
2979 **/
2980 static int sd_remove(struct device *dev)
2981 {
2982 struct scsi_disk *sdkp;
2983
2984 sdkp = dev_get_drvdata(dev);
2985 scsi_autopm_get_device(sdkp->device);
2986
2987 async_synchronize_full_domain(&scsi_sd_probe_domain);
2988 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2989 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2990 device_del(&sdkp->dev);
2991 del_gendisk(sdkp->disk);
2992 sd_shutdown(dev);
2993
2994 mutex_lock(&sd_ref_mutex);
2995 dev_set_drvdata(dev, NULL);
2996 put_device(&sdkp->dev);
2997 mutex_unlock(&sd_ref_mutex);
2998
2999 return 0;
3000 }
3001
3002 /**
3003 * scsi_disk_release - Called to free the scsi_disk structure
3004 * @dev: pointer to embedded class device
3005 *
3006 * sd_ref_mutex must be held entering this routine. Because it is
3007 * called on last put, you should always use the scsi_disk_get()
3008 * scsi_disk_put() helpers which manipulate the semaphore directly
3009 * and never do a direct put_device.
3010 **/
3011 static void scsi_disk_release(struct device *dev)
3012 {
3013 struct scsi_disk *sdkp = to_scsi_disk(dev);
3014 struct gendisk *disk = sdkp->disk;
3015
3016 spin_lock(&sd_index_lock);
3017 ida_remove(&sd_index_ida, sdkp->index);
3018 spin_unlock(&sd_index_lock);
3019
3020 disk->private_data = NULL;
3021 put_disk(disk);
3022 put_device(&sdkp->device->sdev_gendev);
3023
3024 kfree(sdkp);
3025 }
3026
3027 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3028 {
3029 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3030 struct scsi_sense_hdr sshdr;
3031 struct scsi_device *sdp = sdkp->device;
3032 int res;
3033
3034 if (start)
3035 cmd[4] |= 1; /* START */
3036
3037 if (sdp->start_stop_pwr_cond)
3038 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3039
3040 if (!scsi_device_online(sdp))
3041 return -ENODEV;
3042
3043 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3044 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
3045 if (res) {
3046 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3047 sd_print_result(sdkp, res);
3048 if (driver_byte(res) & DRIVER_SENSE)
3049 sd_print_sense_hdr(sdkp, &sshdr);
3050 }
3051
3052 return res;
3053 }
3054
3055 /*
3056 * Send a SYNCHRONIZE CACHE instruction down to the device through
3057 * the normal SCSI command structure. Wait for the command to
3058 * complete.
3059 */
3060 static void sd_shutdown(struct device *dev)
3061 {
3062 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3063
3064 if (!sdkp)
3065 return; /* this can happen */
3066
3067 if (pm_runtime_suspended(dev))
3068 goto exit;
3069
3070 if (sdkp->WCE) {
3071 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3072 sd_sync_cache(sdkp);
3073 }
3074
3075 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3076 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3077 sd_start_stop_device(sdkp, 0);
3078 }
3079
3080 exit:
3081 scsi_disk_put(sdkp);
3082 }
3083
3084 static int sd_suspend(struct device *dev)
3085 {
3086 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3087 int ret = 0;
3088
3089 if (!sdkp)
3090 return 0; /* this can happen */
3091
3092 if (sdkp->WCE) {
3093 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3094 ret = sd_sync_cache(sdkp);
3095 if (ret)
3096 goto done;
3097 }
3098
3099 if (sdkp->device->manage_start_stop) {
3100 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3101 ret = sd_start_stop_device(sdkp, 0);
3102 }
3103
3104 done:
3105 scsi_disk_put(sdkp);
3106 return ret;
3107 }
3108
3109 static int sd_resume(struct device *dev)
3110 {
3111 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3112 int ret = 0;
3113
3114 if (!sdkp->device->manage_start_stop)
3115 goto done;
3116
3117 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3118 ret = sd_start_stop_device(sdkp, 1);
3119
3120 done:
3121 scsi_disk_put(sdkp);
3122 return ret;
3123 }
3124
3125 /**
3126 * init_sd - entry point for this driver (both when built in or when
3127 * a module).
3128 *
3129 * Note: this function registers this driver with the scsi mid-level.
3130 **/
3131 static int __init init_sd(void)
3132 {
3133 int majors = 0, i, err;
3134
3135 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3136
3137 for (i = 0; i < SD_MAJORS; i++)
3138 if (register_blkdev(sd_major(i), "sd") == 0)
3139 majors++;
3140
3141 if (!majors)
3142 return -ENODEV;
3143
3144 err = class_register(&sd_disk_class);
3145 if (err)
3146 goto err_out;
3147
3148 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3149 0, 0, NULL);
3150 if (!sd_cdb_cache) {
3151 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3152 goto err_out_class;
3153 }
3154
3155 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3156 if (!sd_cdb_pool) {
3157 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3158 goto err_out_cache;
3159 }
3160
3161 err = scsi_register_driver(&sd_template.gendrv);
3162 if (err)
3163 goto err_out_driver;
3164
3165 return 0;
3166
3167 err_out_driver:
3168 mempool_destroy(sd_cdb_pool);
3169
3170 err_out_cache:
3171 kmem_cache_destroy(sd_cdb_cache);
3172
3173 err_out_class:
3174 class_unregister(&sd_disk_class);
3175 err_out:
3176 for (i = 0; i < SD_MAJORS; i++)
3177 unregister_blkdev(sd_major(i), "sd");
3178 return err;
3179 }
3180
3181 /**
3182 * exit_sd - exit point for this driver (when it is a module).
3183 *
3184 * Note: this function unregisters this driver from the scsi mid-level.
3185 **/
3186 static void __exit exit_sd(void)
3187 {
3188 int i;
3189
3190 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3191
3192 scsi_unregister_driver(&sd_template.gendrv);
3193 mempool_destroy(sd_cdb_pool);
3194 kmem_cache_destroy(sd_cdb_cache);
3195
3196 class_unregister(&sd_disk_class);
3197
3198 for (i = 0; i < SD_MAJORS; i++)
3199 unregister_blkdev(sd_major(i), "sd");
3200 }
3201
3202 module_init(init_sd);
3203 module_exit(exit_sd);
3204
3205 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3206 struct scsi_sense_hdr *sshdr)
3207 {
3208 sd_printk(KERN_INFO, sdkp, " ");
3209 scsi_show_sense_hdr(sshdr);
3210 sd_printk(KERN_INFO, sdkp, " ");
3211 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3212 }
3213
3214 static void sd_print_result(struct scsi_disk *sdkp, int result)
3215 {
3216 sd_printk(KERN_INFO, sdkp, " ");
3217 scsi_show_result(result);
3218 }
3219
kernel source for telekom puls (alcatel/mediatek)