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