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Merge tag 'dm-3.6-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
[deliverable/linux.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 int sd_revalidate_disk(struct gendisk *);
103 static void sd_unlock_native_capacity(struct gendisk *disk);
104 static int sd_probe(struct device *);
105 static int sd_remove(struct device *);
106 static void sd_shutdown(struct device *);
107 static int sd_suspend(struct device *, pm_message_t state);
108 static int sd_resume(struct device *);
109 static void sd_rescan(struct device *);
110 static int sd_done(struct scsi_cmnd *);
111 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
112 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
113 static void scsi_disk_release(struct device *cdev);
114 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115 static void sd_print_result(struct scsi_disk *, int);
116
117 static DEFINE_SPINLOCK(sd_index_lock);
118 static DEFINE_IDA(sd_index_ida);
119
120 /* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
123 static DEFINE_MUTEX(sd_ref_mutex);
124
125 static struct kmem_cache *sd_cdb_cache;
126 static mempool_t *sd_cdb_pool;
127
128 static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131 };
132
133 static ssize_t
134 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
136 {
137 int i, ct = -1, rcd, wce, sp;
138 struct scsi_disk *sdkp = to_scsi_disk(dev);
139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
153 len = strlen(sd_cache_types[i]);
154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
178 sd_print_sense_hdr(sdkp, &sshdr);
179 return -EINVAL;
180 }
181 revalidate_disk(sdkp->disk);
182 return count;
183 }
184
185 static ssize_t
186 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
188 {
189 struct scsi_disk *sdkp = to_scsi_disk(dev);
190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198 }
199
200 static ssize_t
201 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
203 {
204 struct scsi_disk *sdkp = to_scsi_disk(dev);
205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216 }
217
218 static ssize_t
219 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
221 {
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226 }
227
228 static ssize_t
229 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
230 {
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234 }
235
236 static ssize_t
237 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
239 {
240 struct scsi_disk *sdkp = to_scsi_disk(dev);
241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244 }
245
246 static ssize_t
247 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
249 {
250 struct scsi_disk *sdkp = to_scsi_disk(dev);
251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253 }
254
255 static ssize_t
256 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258 {
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262 }
263
264 static ssize_t
265 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
266 char *buf)
267 {
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 struct scsi_device *sdp = sdkp->device;
270 unsigned int dif, dix;
271
272 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
273 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
274
275 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
276 dif = 0;
277 dix = 1;
278 }
279
280 if (!dif && !dix)
281 return snprintf(buf, 20, "none\n");
282
283 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284 }
285
286 static ssize_t
287 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
288 char *buf)
289 {
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291
292 return snprintf(buf, 20, "%u\n", sdkp->ATO);
293 }
294
295 static ssize_t
296 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
297 char *buf)
298 {
299 struct scsi_disk *sdkp = to_scsi_disk(dev);
300
301 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
302 }
303
304 static const char *lbp_mode[] = {
305 [SD_LBP_FULL] = "full",
306 [SD_LBP_UNMAP] = "unmap",
307 [SD_LBP_WS16] = "writesame_16",
308 [SD_LBP_WS10] = "writesame_10",
309 [SD_LBP_ZERO] = "writesame_zero",
310 [SD_LBP_DISABLE] = "disabled",
311 };
312
313 static ssize_t
314 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
315 char *buf)
316 {
317 struct scsi_disk *sdkp = to_scsi_disk(dev);
318
319 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
320 }
321
322 static ssize_t
323 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
324 const char *buf, size_t count)
325 {
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328
329 if (!capable(CAP_SYS_ADMIN))
330 return -EACCES;
331
332 if (sdp->type != TYPE_DISK)
333 return -EINVAL;
334
335 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
336 sd_config_discard(sdkp, SD_LBP_UNMAP);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
338 sd_config_discard(sdkp, SD_LBP_WS16);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
340 sd_config_discard(sdkp, SD_LBP_WS10);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
342 sd_config_discard(sdkp, SD_LBP_ZERO);
343 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
344 sd_config_discard(sdkp, SD_LBP_DISABLE);
345 else
346 return -EINVAL;
347
348 return count;
349 }
350
351 static ssize_t
352 sd_show_max_medium_access_timeouts(struct device *dev,
353 struct device_attribute *attr, char *buf)
354 {
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
358 }
359
360 static ssize_t
361 sd_store_max_medium_access_timeouts(struct device *dev,
362 struct device_attribute *attr,
363 const char *buf, size_t count)
364 {
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
366 int err;
367
368 if (!capable(CAP_SYS_ADMIN))
369 return -EACCES;
370
371 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
372
373 return err ? err : count;
374 }
375
376 static struct device_attribute sd_disk_attrs[] = {
377 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
378 sd_store_cache_type),
379 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
380 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
381 sd_store_allow_restart),
382 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
383 sd_store_manage_start_stop),
384 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
385 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
386 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
387 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
388 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
389 sd_store_provisioning_mode),
390 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
391 sd_show_max_medium_access_timeouts,
392 sd_store_max_medium_access_timeouts),
393 __ATTR_NULL,
394 };
395
396 static struct class sd_disk_class = {
397 .name = "scsi_disk",
398 .owner = THIS_MODULE,
399 .dev_release = scsi_disk_release,
400 .dev_attrs = sd_disk_attrs,
401 };
402
403 static struct scsi_driver sd_template = {
404 .owner = THIS_MODULE,
405 .gendrv = {
406 .name = "sd",
407 .probe = sd_probe,
408 .remove = sd_remove,
409 .suspend = sd_suspend,
410 .resume = sd_resume,
411 .shutdown = sd_shutdown,
412 },
413 .rescan = sd_rescan,
414 .done = sd_done,
415 .eh_action = sd_eh_action,
416 };
417
418 /*
419 * Device no to disk mapping:
420 *
421 * major disc2 disc p1
422 * |............|.............|....|....| <- dev_t
423 * 31 20 19 8 7 4 3 0
424 *
425 * Inside a major, we have 16k disks, however mapped non-
426 * contiguously. The first 16 disks are for major0, the next
427 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * for major1, ...
429 * As we stay compatible with our numbering scheme, we can reuse
430 * the well-know SCSI majors 8, 65--71, 136--143.
431 */
432 static int sd_major(int major_idx)
433 {
434 switch (major_idx) {
435 case 0:
436 return SCSI_DISK0_MAJOR;
437 case 1 ... 7:
438 return SCSI_DISK1_MAJOR + major_idx - 1;
439 case 8 ... 15:
440 return SCSI_DISK8_MAJOR + major_idx - 8;
441 default:
442 BUG();
443 return 0; /* shut up gcc */
444 }
445 }
446
447 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
448 {
449 struct scsi_disk *sdkp = NULL;
450
451 if (disk->private_data) {
452 sdkp = scsi_disk(disk);
453 if (scsi_device_get(sdkp->device) == 0)
454 get_device(&sdkp->dev);
455 else
456 sdkp = NULL;
457 }
458 return sdkp;
459 }
460
461 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
462 {
463 struct scsi_disk *sdkp;
464
465 mutex_lock(&sd_ref_mutex);
466 sdkp = __scsi_disk_get(disk);
467 mutex_unlock(&sd_ref_mutex);
468 return sdkp;
469 }
470
471 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
472 {
473 struct scsi_disk *sdkp;
474
475 mutex_lock(&sd_ref_mutex);
476 sdkp = dev_get_drvdata(dev);
477 if (sdkp)
478 sdkp = __scsi_disk_get(sdkp->disk);
479 mutex_unlock(&sd_ref_mutex);
480 return sdkp;
481 }
482
483 static void scsi_disk_put(struct scsi_disk *sdkp)
484 {
485 struct scsi_device *sdev = sdkp->device;
486
487 mutex_lock(&sd_ref_mutex);
488 put_device(&sdkp->dev);
489 scsi_device_put(sdev);
490 mutex_unlock(&sd_ref_mutex);
491 }
492
493 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
494 {
495 unsigned int prot_op = SCSI_PROT_NORMAL;
496 unsigned int dix = scsi_prot_sg_count(scmd);
497
498 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
499 if (dif && dix)
500 prot_op = SCSI_PROT_READ_PASS;
501 else if (dif && !dix)
502 prot_op = SCSI_PROT_READ_STRIP;
503 else if (!dif && dix)
504 prot_op = SCSI_PROT_READ_INSERT;
505 } else {
506 if (dif && dix)
507 prot_op = SCSI_PROT_WRITE_PASS;
508 else if (dif && !dix)
509 prot_op = SCSI_PROT_WRITE_INSERT;
510 else if (!dif && dix)
511 prot_op = SCSI_PROT_WRITE_STRIP;
512 }
513
514 scsi_set_prot_op(scmd, prot_op);
515 scsi_set_prot_type(scmd, dif);
516 }
517
518 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
519 {
520 struct request_queue *q = sdkp->disk->queue;
521 unsigned int logical_block_size = sdkp->device->sector_size;
522 unsigned int max_blocks = 0;
523
524 q->limits.discard_zeroes_data = sdkp->lbprz;
525 q->limits.discard_alignment = sdkp->unmap_alignment *
526 logical_block_size;
527 q->limits.discard_granularity =
528 max(sdkp->physical_block_size,
529 sdkp->unmap_granularity * logical_block_size);
530
531 sdkp->provisioning_mode = mode;
532
533 switch (mode) {
534
535 case SD_LBP_DISABLE:
536 q->limits.max_discard_sectors = 0;
537 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
538 return;
539
540 case SD_LBP_UNMAP:
541 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
542 break;
543
544 case SD_LBP_WS16:
545 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
546 break;
547
548 case SD_LBP_WS10:
549 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
550 break;
551
552 case SD_LBP_ZERO:
553 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
554 q->limits.discard_zeroes_data = 1;
555 break;
556 }
557
558 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
559 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
560 }
561
562 /**
563 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
564 * @sdp: scsi device to operate one
565 * @rq: Request to prepare
566 *
567 * Will issue either UNMAP or WRITE SAME(16) depending on preference
568 * indicated by target device.
569 **/
570 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
571 {
572 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
573 struct bio *bio = rq->bio;
574 sector_t sector = bio->bi_sector;
575 unsigned int nr_sectors = bio_sectors(bio);
576 unsigned int len;
577 int ret;
578 char *buf;
579 struct page *page;
580
581 if (sdkp->device->sector_size == 4096) {
582 sector >>= 3;
583 nr_sectors >>= 3;
584 }
585
586 rq->timeout = SD_TIMEOUT;
587
588 memset(rq->cmd, 0, rq->cmd_len);
589
590 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
591 if (!page)
592 return BLKPREP_DEFER;
593
594 switch (sdkp->provisioning_mode) {
595 case SD_LBP_UNMAP:
596 buf = page_address(page);
597
598 rq->cmd_len = 10;
599 rq->cmd[0] = UNMAP;
600 rq->cmd[8] = 24;
601
602 put_unaligned_be16(6 + 16, &buf[0]);
603 put_unaligned_be16(16, &buf[2]);
604 put_unaligned_be64(sector, &buf[8]);
605 put_unaligned_be32(nr_sectors, &buf[16]);
606
607 len = 24;
608 break;
609
610 case SD_LBP_WS16:
611 rq->cmd_len = 16;
612 rq->cmd[0] = WRITE_SAME_16;
613 rq->cmd[1] = 0x8; /* UNMAP */
614 put_unaligned_be64(sector, &rq->cmd[2]);
615 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
616
617 len = sdkp->device->sector_size;
618 break;
619
620 case SD_LBP_WS10:
621 case SD_LBP_ZERO:
622 rq->cmd_len = 10;
623 rq->cmd[0] = WRITE_SAME;
624 if (sdkp->provisioning_mode == SD_LBP_WS10)
625 rq->cmd[1] = 0x8; /* UNMAP */
626 put_unaligned_be32(sector, &rq->cmd[2]);
627 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
628
629 len = sdkp->device->sector_size;
630 break;
631
632 default:
633 ret = BLKPREP_KILL;
634 goto out;
635 }
636
637 blk_add_request_payload(rq, page, len);
638 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
639 rq->buffer = page_address(page);
640
641 out:
642 if (ret != BLKPREP_OK) {
643 __free_page(page);
644 rq->buffer = NULL;
645 }
646 return ret;
647 }
648
649 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
650 {
651 rq->timeout = SD_FLUSH_TIMEOUT;
652 rq->retries = SD_MAX_RETRIES;
653 rq->cmd[0] = SYNCHRONIZE_CACHE;
654 rq->cmd_len = 10;
655
656 return scsi_setup_blk_pc_cmnd(sdp, rq);
657 }
658
659 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
660 {
661 if (rq->cmd_flags & REQ_DISCARD) {
662 free_page((unsigned long)rq->buffer);
663 rq->buffer = NULL;
664 }
665 }
666
667 /**
668 * sd_prep_fn - build a scsi (read or write) command from
669 * information in the request structure.
670 * @SCpnt: pointer to mid-level's per scsi command structure that
671 * contains request and into which the scsi command is written
672 *
673 * Returns 1 if successful and 0 if error (or cannot be done now).
674 **/
675 static int sd_prep_fn(struct request_queue *q, struct request *rq)
676 {
677 struct scsi_cmnd *SCpnt;
678 struct scsi_device *sdp = q->queuedata;
679 struct gendisk *disk = rq->rq_disk;
680 struct scsi_disk *sdkp;
681 sector_t block = blk_rq_pos(rq);
682 sector_t threshold;
683 unsigned int this_count = blk_rq_sectors(rq);
684 int ret, host_dif;
685 unsigned char protect;
686
687 /*
688 * Discard request come in as REQ_TYPE_FS but we turn them into
689 * block PC requests to make life easier.
690 */
691 if (rq->cmd_flags & REQ_DISCARD) {
692 ret = scsi_setup_discard_cmnd(sdp, rq);
693 goto out;
694 } else if (rq->cmd_flags & REQ_FLUSH) {
695 ret = scsi_setup_flush_cmnd(sdp, rq);
696 goto out;
697 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
698 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
699 goto out;
700 } else if (rq->cmd_type != REQ_TYPE_FS) {
701 ret = BLKPREP_KILL;
702 goto out;
703 }
704 ret = scsi_setup_fs_cmnd(sdp, rq);
705 if (ret != BLKPREP_OK)
706 goto out;
707 SCpnt = rq->special;
708 sdkp = scsi_disk(disk);
709
710 /* from here on until we're complete, any goto out
711 * is used for a killable error condition */
712 ret = BLKPREP_KILL;
713
714 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
715 "sd_prep_fn: block=%llu, "
716 "count=%d\n",
717 (unsigned long long)block,
718 this_count));
719
720 if (!sdp || !scsi_device_online(sdp) ||
721 block + blk_rq_sectors(rq) > get_capacity(disk)) {
722 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
723 "Finishing %u sectors\n",
724 blk_rq_sectors(rq)));
725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
726 "Retry with 0x%p\n", SCpnt));
727 goto out;
728 }
729
730 if (sdp->changed) {
731 /*
732 * quietly refuse to do anything to a changed disc until
733 * the changed bit has been reset
734 */
735 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
736 goto out;
737 }
738
739 /*
740 * Some SD card readers can't handle multi-sector accesses which touch
741 * the last one or two hardware sectors. Split accesses as needed.
742 */
743 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
744 (sdp->sector_size / 512);
745
746 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
747 if (block < threshold) {
748 /* Access up to the threshold but not beyond */
749 this_count = threshold - block;
750 } else {
751 /* Access only a single hardware sector */
752 this_count = sdp->sector_size / 512;
753 }
754 }
755
756 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
757 (unsigned long long)block));
758
759 /*
760 * If we have a 1K hardware sectorsize, prevent access to single
761 * 512 byte sectors. In theory we could handle this - in fact
762 * the scsi cdrom driver must be able to handle this because
763 * we typically use 1K blocksizes, and cdroms typically have
764 * 2K hardware sectorsizes. Of course, things are simpler
765 * with the cdrom, since it is read-only. For performance
766 * reasons, the filesystems should be able to handle this
767 * and not force the scsi disk driver to use bounce buffers
768 * for this.
769 */
770 if (sdp->sector_size == 1024) {
771 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
774 goto out;
775 } else {
776 block = block >> 1;
777 this_count = this_count >> 1;
778 }
779 }
780 if (sdp->sector_size == 2048) {
781 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
784 goto out;
785 } else {
786 block = block >> 2;
787 this_count = this_count >> 2;
788 }
789 }
790 if (sdp->sector_size == 4096) {
791 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
792 scmd_printk(KERN_ERR, SCpnt,
793 "Bad block number requested\n");
794 goto out;
795 } else {
796 block = block >> 3;
797 this_count = this_count >> 3;
798 }
799 }
800 if (rq_data_dir(rq) == WRITE) {
801 if (!sdp->writeable) {
802 goto out;
803 }
804 SCpnt->cmnd[0] = WRITE_6;
805 SCpnt->sc_data_direction = DMA_TO_DEVICE;
806
807 if (blk_integrity_rq(rq) &&
808 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
809 goto out;
810
811 } else if (rq_data_dir(rq) == READ) {
812 SCpnt->cmnd[0] = READ_6;
813 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
814 } else {
815 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
816 goto out;
817 }
818
819 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
820 "%s %d/%u 512 byte blocks.\n",
821 (rq_data_dir(rq) == WRITE) ?
822 "writing" : "reading", this_count,
823 blk_rq_sectors(rq)));
824
825 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
826 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
827 if (host_dif)
828 protect = 1 << 5;
829 else
830 protect = 0;
831
832 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
833 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
834
835 if (unlikely(SCpnt->cmnd == NULL)) {
836 ret = BLKPREP_DEFER;
837 goto out;
838 }
839
840 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
841 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
842 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
843 SCpnt->cmnd[7] = 0x18;
844 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
845 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
846
847 /* LBA */
848 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
849 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
850 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
851 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
852 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
853 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
854 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
855 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
856
857 /* Expected Indirect LBA */
858 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
859 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
860 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
861 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
862
863 /* Transfer length */
864 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
865 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
866 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
868 } else if (block > 0xffffffff) {
869 SCpnt->cmnd[0] += READ_16 - READ_6;
870 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
871 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
872 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
873 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
874 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
875 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
876 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
877 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
878 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
879 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
880 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
881 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
882 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
883 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
884 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
885 scsi_device_protection(SCpnt->device) ||
886 SCpnt->device->use_10_for_rw) {
887 if (this_count > 0xffff)
888 this_count = 0xffff;
889
890 SCpnt->cmnd[0] += READ_10 - READ_6;
891 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
892 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
893 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
894 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
895 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
896 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
897 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
898 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
899 } else {
900 if (unlikely(rq->cmd_flags & REQ_FUA)) {
901 /*
902 * This happens only if this drive failed
903 * 10byte rw command with ILLEGAL_REQUEST
904 * during operation and thus turned off
905 * use_10_for_rw.
906 */
907 scmd_printk(KERN_ERR, SCpnt,
908 "FUA write on READ/WRITE(6) drive\n");
909 goto out;
910 }
911
912 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
913 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
914 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
915 SCpnt->cmnd[4] = (unsigned char) this_count;
916 SCpnt->cmnd[5] = 0;
917 }
918 SCpnt->sdb.length = this_count * sdp->sector_size;
919
920 /* If DIF or DIX is enabled, tell HBA how to handle request */
921 if (host_dif || scsi_prot_sg_count(SCpnt))
922 sd_prot_op(SCpnt, host_dif);
923
924 /*
925 * We shouldn't disconnect in the middle of a sector, so with a dumb
926 * host adapter, it's safe to assume that we can at least transfer
927 * this many bytes between each connect / disconnect.
928 */
929 SCpnt->transfersize = sdp->sector_size;
930 SCpnt->underflow = this_count << 9;
931 SCpnt->allowed = SD_MAX_RETRIES;
932
933 /*
934 * This indicates that the command is ready from our end to be
935 * queued.
936 */
937 ret = BLKPREP_OK;
938 out:
939 return scsi_prep_return(q, rq, ret);
940 }
941
942 /**
943 * sd_open - open a scsi disk device
944 * @inode: only i_rdev member may be used
945 * @filp: only f_mode and f_flags may be used
946 *
947 * Returns 0 if successful. Returns a negated errno value in case
948 * of error.
949 *
950 * Note: This can be called from a user context (e.g. fsck(1) )
951 * or from within the kernel (e.g. as a result of a mount(1) ).
952 * In the latter case @inode and @filp carry an abridged amount
953 * of information as noted above.
954 *
955 * Locking: called with bdev->bd_mutex held.
956 **/
957 static int sd_open(struct block_device *bdev, fmode_t mode)
958 {
959 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
960 struct scsi_device *sdev;
961 int retval;
962
963 if (!sdkp)
964 return -ENXIO;
965
966 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
967
968 sdev = sdkp->device;
969
970 retval = scsi_autopm_get_device(sdev);
971 if (retval)
972 goto error_autopm;
973
974 /*
975 * If the device is in error recovery, wait until it is done.
976 * If the device is offline, then disallow any access to it.
977 */
978 retval = -ENXIO;
979 if (!scsi_block_when_processing_errors(sdev))
980 goto error_out;
981
982 if (sdev->removable || sdkp->write_prot)
983 check_disk_change(bdev);
984
985 /*
986 * If the drive is empty, just let the open fail.
987 */
988 retval = -ENOMEDIUM;
989 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
990 goto error_out;
991
992 /*
993 * If the device has the write protect tab set, have the open fail
994 * if the user expects to be able to write to the thing.
995 */
996 retval = -EROFS;
997 if (sdkp->write_prot && (mode & FMODE_WRITE))
998 goto error_out;
999
1000 /*
1001 * It is possible that the disk changing stuff resulted in
1002 * the device being taken offline. If this is the case,
1003 * report this to the user, and don't pretend that the
1004 * open actually succeeded.
1005 */
1006 retval = -ENXIO;
1007 if (!scsi_device_online(sdev))
1008 goto error_out;
1009
1010 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1011 if (scsi_block_when_processing_errors(sdev))
1012 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1013 }
1014
1015 return 0;
1016
1017 error_out:
1018 scsi_autopm_put_device(sdev);
1019 error_autopm:
1020 scsi_disk_put(sdkp);
1021 return retval;
1022 }
1023
1024 /**
1025 * sd_release - invoked when the (last) close(2) is called on this
1026 * scsi disk.
1027 * @inode: only i_rdev member may be used
1028 * @filp: only f_mode and f_flags may be used
1029 *
1030 * Returns 0.
1031 *
1032 * Note: may block (uninterruptible) if error recovery is underway
1033 * on this disk.
1034 *
1035 * Locking: called with bdev->bd_mutex held.
1036 **/
1037 static int sd_release(struct gendisk *disk, fmode_t mode)
1038 {
1039 struct scsi_disk *sdkp = scsi_disk(disk);
1040 struct scsi_device *sdev = sdkp->device;
1041
1042 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1043
1044 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1045 if (scsi_block_when_processing_errors(sdev))
1046 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1047 }
1048
1049 /*
1050 * XXX and what if there are packets in flight and this close()
1051 * XXX is followed by a "rmmod sd_mod"?
1052 */
1053
1054 scsi_autopm_put_device(sdev);
1055 scsi_disk_put(sdkp);
1056 return 0;
1057 }
1058
1059 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1060 {
1061 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1062 struct scsi_device *sdp = sdkp->device;
1063 struct Scsi_Host *host = sdp->host;
1064 int diskinfo[4];
1065
1066 /* default to most commonly used values */
1067 diskinfo[0] = 0x40; /* 1 << 6 */
1068 diskinfo[1] = 0x20; /* 1 << 5 */
1069 diskinfo[2] = sdkp->capacity >> 11;
1070
1071 /* override with calculated, extended default, or driver values */
1072 if (host->hostt->bios_param)
1073 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1074 else
1075 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1076
1077 geo->heads = diskinfo[0];
1078 geo->sectors = diskinfo[1];
1079 geo->cylinders = diskinfo[2];
1080 return 0;
1081 }
1082
1083 /**
1084 * sd_ioctl - process an ioctl
1085 * @inode: only i_rdev/i_bdev members may be used
1086 * @filp: only f_mode and f_flags may be used
1087 * @cmd: ioctl command number
1088 * @arg: this is third argument given to ioctl(2) system call.
1089 * Often contains a pointer.
1090 *
1091 * Returns 0 if successful (some ioctls return positive numbers on
1092 * success as well). Returns a negated errno value in case of error.
1093 *
1094 * Note: most ioctls are forward onto the block subsystem or further
1095 * down in the scsi subsystem.
1096 **/
1097 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1098 unsigned int cmd, unsigned long arg)
1099 {
1100 struct gendisk *disk = bdev->bd_disk;
1101 struct scsi_disk *sdkp = scsi_disk(disk);
1102 struct scsi_device *sdp = sdkp->device;
1103 void __user *p = (void __user *)arg;
1104 int error;
1105
1106 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1107 "cmd=0x%x\n", disk->disk_name, cmd));
1108
1109 error = scsi_verify_blk_ioctl(bdev, cmd);
1110 if (error < 0)
1111 return error;
1112
1113 /*
1114 * If we are in the middle of error recovery, don't let anyone
1115 * else try and use this device. Also, if error recovery fails, it
1116 * may try and take the device offline, in which case all further
1117 * access to the device is prohibited.
1118 */
1119 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1120 (mode & FMODE_NDELAY) != 0);
1121 if (!scsi_block_when_processing_errors(sdp) || !error)
1122 goto out;
1123
1124 /*
1125 * Send SCSI addressing ioctls directly to mid level, send other
1126 * ioctls to block level and then onto mid level if they can't be
1127 * resolved.
1128 */
1129 switch (cmd) {
1130 case SCSI_IOCTL_GET_IDLUN:
1131 case SCSI_IOCTL_GET_BUS_NUMBER:
1132 error = scsi_ioctl(sdp, cmd, p);
1133 break;
1134 default:
1135 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1136 if (error != -ENOTTY)
1137 break;
1138 error = scsi_ioctl(sdp, cmd, p);
1139 break;
1140 }
1141 out:
1142 return error;
1143 }
1144
1145 static void set_media_not_present(struct scsi_disk *sdkp)
1146 {
1147 if (sdkp->media_present)
1148 sdkp->device->changed = 1;
1149
1150 if (sdkp->device->removable) {
1151 sdkp->media_present = 0;
1152 sdkp->capacity = 0;
1153 }
1154 }
1155
1156 static int media_not_present(struct scsi_disk *sdkp,
1157 struct scsi_sense_hdr *sshdr)
1158 {
1159 if (!scsi_sense_valid(sshdr))
1160 return 0;
1161
1162 /* not invoked for commands that could return deferred errors */
1163 switch (sshdr->sense_key) {
1164 case UNIT_ATTENTION:
1165 case NOT_READY:
1166 /* medium not present */
1167 if (sshdr->asc == 0x3A) {
1168 set_media_not_present(sdkp);
1169 return 1;
1170 }
1171 }
1172 return 0;
1173 }
1174
1175 /**
1176 * sd_check_events - check media events
1177 * @disk: kernel device descriptor
1178 * @clearing: disk events currently being cleared
1179 *
1180 * Returns mask of DISK_EVENT_*.
1181 *
1182 * Note: this function is invoked from the block subsystem.
1183 **/
1184 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1185 {
1186 struct scsi_disk *sdkp = scsi_disk(disk);
1187 struct scsi_device *sdp = sdkp->device;
1188 struct scsi_sense_hdr *sshdr = NULL;
1189 int retval;
1190
1191 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1192
1193 /*
1194 * If the device is offline, don't send any commands - just pretend as
1195 * if the command failed. If the device ever comes back online, we
1196 * can deal with it then. It is only because of unrecoverable errors
1197 * that we would ever take a device offline in the first place.
1198 */
1199 if (!scsi_device_online(sdp)) {
1200 set_media_not_present(sdkp);
1201 goto out;
1202 }
1203
1204 /*
1205 * Using TEST_UNIT_READY enables differentiation between drive with
1206 * no cartridge loaded - NOT READY, drive with changed cartridge -
1207 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1208 *
1209 * Drives that auto spin down. eg iomega jaz 1G, will be started
1210 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1211 * sd_revalidate() is called.
1212 */
1213 retval = -ENODEV;
1214
1215 if (scsi_block_when_processing_errors(sdp)) {
1216 retval = scsi_autopm_get_device(sdp);
1217 if (retval)
1218 goto out;
1219
1220 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1221 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1222 sshdr);
1223 scsi_autopm_put_device(sdp);
1224 }
1225
1226 /* failed to execute TUR, assume media not present */
1227 if (host_byte(retval)) {
1228 set_media_not_present(sdkp);
1229 goto out;
1230 }
1231
1232 if (media_not_present(sdkp, sshdr))
1233 goto out;
1234
1235 /*
1236 * For removable scsi disk we have to recognise the presence
1237 * of a disk in the drive.
1238 */
1239 if (!sdkp->media_present)
1240 sdp->changed = 1;
1241 sdkp->media_present = 1;
1242 out:
1243 /*
1244 * sdp->changed is set under the following conditions:
1245 *
1246 * Medium present state has changed in either direction.
1247 * Device has indicated UNIT_ATTENTION.
1248 */
1249 kfree(sshdr);
1250 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1251 sdp->changed = 0;
1252 return retval;
1253 }
1254
1255 static int sd_sync_cache(struct scsi_disk *sdkp)
1256 {
1257 int retries, res;
1258 struct scsi_device *sdp = sdkp->device;
1259 struct scsi_sense_hdr sshdr;
1260
1261 if (!scsi_device_online(sdp))
1262 return -ENODEV;
1263
1264
1265 for (retries = 3; retries > 0; --retries) {
1266 unsigned char cmd[10] = { 0 };
1267
1268 cmd[0] = SYNCHRONIZE_CACHE;
1269 /*
1270 * Leave the rest of the command zero to indicate
1271 * flush everything.
1272 */
1273 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1274 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1275 if (res == 0)
1276 break;
1277 }
1278
1279 if (res) {
1280 sd_print_result(sdkp, res);
1281 if (driver_byte(res) & DRIVER_SENSE)
1282 sd_print_sense_hdr(sdkp, &sshdr);
1283 }
1284
1285 if (res)
1286 return -EIO;
1287 return 0;
1288 }
1289
1290 static void sd_rescan(struct device *dev)
1291 {
1292 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1293
1294 if (sdkp) {
1295 revalidate_disk(sdkp->disk);
1296 scsi_disk_put(sdkp);
1297 }
1298 }
1299
1300
1301 #ifdef CONFIG_COMPAT
1302 /*
1303 * This gets directly called from VFS. When the ioctl
1304 * is not recognized we go back to the other translation paths.
1305 */
1306 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1307 unsigned int cmd, unsigned long arg)
1308 {
1309 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1310 int ret;
1311
1312 ret = scsi_verify_blk_ioctl(bdev, cmd);
1313 if (ret < 0)
1314 return ret;
1315
1316 /*
1317 * If we are in the middle of error recovery, don't let anyone
1318 * else try and use this device. Also, if error recovery fails, it
1319 * may try and take the device offline, in which case all further
1320 * access to the device is prohibited.
1321 */
1322 if (!scsi_block_when_processing_errors(sdev))
1323 return -ENODEV;
1324
1325 if (sdev->host->hostt->compat_ioctl) {
1326 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1327
1328 return ret;
1329 }
1330
1331 /*
1332 * Let the static ioctl translation table take care of it.
1333 */
1334 return -ENOIOCTLCMD;
1335 }
1336 #endif
1337
1338 static const struct block_device_operations sd_fops = {
1339 .owner = THIS_MODULE,
1340 .open = sd_open,
1341 .release = sd_release,
1342 .ioctl = sd_ioctl,
1343 .getgeo = sd_getgeo,
1344 #ifdef CONFIG_COMPAT
1345 .compat_ioctl = sd_compat_ioctl,
1346 #endif
1347 .check_events = sd_check_events,
1348 .revalidate_disk = sd_revalidate_disk,
1349 .unlock_native_capacity = sd_unlock_native_capacity,
1350 };
1351
1352 /**
1353 * sd_eh_action - error handling callback
1354 * @scmd: sd-issued command that has failed
1355 * @eh_cmnd: The command that was sent during error handling
1356 * @eh_cmnd_len: Length of eh_cmnd in bytes
1357 * @eh_disp: The recovery disposition suggested by the midlayer
1358 *
1359 * This function is called by the SCSI midlayer upon completion of
1360 * an error handling command (TEST UNIT READY, START STOP UNIT,
1361 * etc.) The command sent to the device by the error handler is
1362 * stored in eh_cmnd. The result of sending the eh command is
1363 * passed in eh_disp.
1364 **/
1365 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1366 int eh_cmnd_len, int eh_disp)
1367 {
1368 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1369
1370 if (!scsi_device_online(scmd->device) ||
1371 !scsi_medium_access_command(scmd))
1372 return eh_disp;
1373
1374 /*
1375 * The device has timed out executing a medium access command.
1376 * However, the TEST UNIT READY command sent during error
1377 * handling completed successfully. Either the device is in the
1378 * process of recovering or has it suffered an internal failure
1379 * that prevents access to the storage medium.
1380 */
1381 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1382 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1383 sdkp->medium_access_timed_out++;
1384
1385 /*
1386 * If the device keeps failing read/write commands but TEST UNIT
1387 * READY always completes successfully we assume that medium
1388 * access is no longer possible and take the device offline.
1389 */
1390 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1391 scmd_printk(KERN_ERR, scmd,
1392 "Medium access timeout failure. Offlining disk!\n");
1393 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1394
1395 return FAILED;
1396 }
1397
1398 return eh_disp;
1399 }
1400
1401 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1402 {
1403 u64 start_lba = blk_rq_pos(scmd->request);
1404 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1405 u64 bad_lba;
1406 int info_valid;
1407 /*
1408 * resid is optional but mostly filled in. When it's unused,
1409 * its value is zero, so we assume the whole buffer transferred
1410 */
1411 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1412 unsigned int good_bytes;
1413
1414 if (scmd->request->cmd_type != REQ_TYPE_FS)
1415 return 0;
1416
1417 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1418 SCSI_SENSE_BUFFERSIZE,
1419 &bad_lba);
1420 if (!info_valid)
1421 return 0;
1422
1423 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1424 return 0;
1425
1426 if (scmd->device->sector_size < 512) {
1427 /* only legitimate sector_size here is 256 */
1428 start_lba <<= 1;
1429 end_lba <<= 1;
1430 } else {
1431 /* be careful ... don't want any overflows */
1432 u64 factor = scmd->device->sector_size / 512;
1433 do_div(start_lba, factor);
1434 do_div(end_lba, factor);
1435 }
1436
1437 /* The bad lba was reported incorrectly, we have no idea where
1438 * the error is.
1439 */
1440 if (bad_lba < start_lba || bad_lba >= end_lba)
1441 return 0;
1442
1443 /* This computation should always be done in terms of
1444 * the resolution of the device's medium.
1445 */
1446 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1447 return min(good_bytes, transferred);
1448 }
1449
1450 /**
1451 * sd_done - bottom half handler: called when the lower level
1452 * driver has completed (successfully or otherwise) a scsi command.
1453 * @SCpnt: mid-level's per command structure.
1454 *
1455 * Note: potentially run from within an ISR. Must not block.
1456 **/
1457 static int sd_done(struct scsi_cmnd *SCpnt)
1458 {
1459 int result = SCpnt->result;
1460 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1461 struct scsi_sense_hdr sshdr;
1462 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1463 int sense_valid = 0;
1464 int sense_deferred = 0;
1465 unsigned char op = SCpnt->cmnd[0];
1466
1467 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1468 scsi_set_resid(SCpnt, 0);
1469
1470 if (result) {
1471 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1472 if (sense_valid)
1473 sense_deferred = scsi_sense_is_deferred(&sshdr);
1474 }
1475 #ifdef CONFIG_SCSI_LOGGING
1476 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1477 if (sense_valid) {
1478 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1479 "sd_done: sb[respc,sk,asc,"
1480 "ascq]=%x,%x,%x,%x\n",
1481 sshdr.response_code,
1482 sshdr.sense_key, sshdr.asc,
1483 sshdr.ascq));
1484 }
1485 #endif
1486 if (driver_byte(result) != DRIVER_SENSE &&
1487 (!sense_valid || sense_deferred))
1488 goto out;
1489
1490 sdkp->medium_access_timed_out = 0;
1491
1492 switch (sshdr.sense_key) {
1493 case HARDWARE_ERROR:
1494 case MEDIUM_ERROR:
1495 good_bytes = sd_completed_bytes(SCpnt);
1496 break;
1497 case RECOVERED_ERROR:
1498 good_bytes = scsi_bufflen(SCpnt);
1499 break;
1500 case NO_SENSE:
1501 /* This indicates a false check condition, so ignore it. An
1502 * unknown amount of data was transferred so treat it as an
1503 * error.
1504 */
1505 scsi_print_sense("sd", SCpnt);
1506 SCpnt->result = 0;
1507 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1508 break;
1509 case ABORTED_COMMAND:
1510 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1511 good_bytes = sd_completed_bytes(SCpnt);
1512 break;
1513 case ILLEGAL_REQUEST:
1514 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1515 good_bytes = sd_completed_bytes(SCpnt);
1516 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1517 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1518 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1519 sd_config_discard(sdkp, SD_LBP_DISABLE);
1520 break;
1521 default:
1522 break;
1523 }
1524 out:
1525 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1526 sd_dif_complete(SCpnt, good_bytes);
1527
1528 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1529 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1530
1531 /* We have to print a failed command here as the
1532 * extended CDB gets freed before scsi_io_completion()
1533 * is called.
1534 */
1535 if (result)
1536 scsi_print_command(SCpnt);
1537
1538 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1539 SCpnt->cmnd = NULL;
1540 SCpnt->cmd_len = 0;
1541 }
1542
1543 return good_bytes;
1544 }
1545
1546 /*
1547 * spinup disk - called only in sd_revalidate_disk()
1548 */
1549 static void
1550 sd_spinup_disk(struct scsi_disk *sdkp)
1551 {
1552 unsigned char cmd[10];
1553 unsigned long spintime_expire = 0;
1554 int retries, spintime;
1555 unsigned int the_result;
1556 struct scsi_sense_hdr sshdr;
1557 int sense_valid = 0;
1558
1559 spintime = 0;
1560
1561 /* Spin up drives, as required. Only do this at boot time */
1562 /* Spinup needs to be done for module loads too. */
1563 do {
1564 retries = 0;
1565
1566 do {
1567 cmd[0] = TEST_UNIT_READY;
1568 memset((void *) &cmd[1], 0, 9);
1569
1570 the_result = scsi_execute_req(sdkp->device, cmd,
1571 DMA_NONE, NULL, 0,
1572 &sshdr, SD_TIMEOUT,
1573 SD_MAX_RETRIES, NULL);
1574
1575 /*
1576 * If the drive has indicated to us that it
1577 * doesn't have any media in it, don't bother
1578 * with any more polling.
1579 */
1580 if (media_not_present(sdkp, &sshdr))
1581 return;
1582
1583 if (the_result)
1584 sense_valid = scsi_sense_valid(&sshdr);
1585 retries++;
1586 } while (retries < 3 &&
1587 (!scsi_status_is_good(the_result) ||
1588 ((driver_byte(the_result) & DRIVER_SENSE) &&
1589 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1590
1591 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1592 /* no sense, TUR either succeeded or failed
1593 * with a status error */
1594 if(!spintime && !scsi_status_is_good(the_result)) {
1595 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1596 sd_print_result(sdkp, the_result);
1597 }
1598 break;
1599 }
1600
1601 /*
1602 * The device does not want the automatic start to be issued.
1603 */
1604 if (sdkp->device->no_start_on_add)
1605 break;
1606
1607 if (sense_valid && sshdr.sense_key == NOT_READY) {
1608 if (sshdr.asc == 4 && sshdr.ascq == 3)
1609 break; /* manual intervention required */
1610 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1611 break; /* standby */
1612 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1613 break; /* unavailable */
1614 /*
1615 * Issue command to spin up drive when not ready
1616 */
1617 if (!spintime) {
1618 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1619 cmd[0] = START_STOP;
1620 cmd[1] = 1; /* Return immediately */
1621 memset((void *) &cmd[2], 0, 8);
1622 cmd[4] = 1; /* Start spin cycle */
1623 if (sdkp->device->start_stop_pwr_cond)
1624 cmd[4] |= 1 << 4;
1625 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1626 NULL, 0, &sshdr,
1627 SD_TIMEOUT, SD_MAX_RETRIES,
1628 NULL);
1629 spintime_expire = jiffies + 100 * HZ;
1630 spintime = 1;
1631 }
1632 /* Wait 1 second for next try */
1633 msleep(1000);
1634 printk(".");
1635
1636 /*
1637 * Wait for USB flash devices with slow firmware.
1638 * Yes, this sense key/ASC combination shouldn't
1639 * occur here. It's characteristic of these devices.
1640 */
1641 } else if (sense_valid &&
1642 sshdr.sense_key == UNIT_ATTENTION &&
1643 sshdr.asc == 0x28) {
1644 if (!spintime) {
1645 spintime_expire = jiffies + 5 * HZ;
1646 spintime = 1;
1647 }
1648 /* Wait 1 second for next try */
1649 msleep(1000);
1650 } else {
1651 /* we don't understand the sense code, so it's
1652 * probably pointless to loop */
1653 if(!spintime) {
1654 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1655 sd_print_sense_hdr(sdkp, &sshdr);
1656 }
1657 break;
1658 }
1659
1660 } while (spintime && time_before_eq(jiffies, spintime_expire));
1661
1662 if (spintime) {
1663 if (scsi_status_is_good(the_result))
1664 printk("ready\n");
1665 else
1666 printk("not responding...\n");
1667 }
1668 }
1669
1670
1671 /*
1672 * Determine whether disk supports Data Integrity Field.
1673 */
1674 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1675 {
1676 struct scsi_device *sdp = sdkp->device;
1677 u8 type;
1678
1679 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1680 return;
1681
1682 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1683
1684 if (type == sdkp->protection_type || !sdkp->first_scan)
1685 return;
1686
1687 sdkp->protection_type = type;
1688
1689 if (type > SD_DIF_TYPE3_PROTECTION) {
1690 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1691 "protection type %u. Disabling disk!\n", type);
1692 sdkp->capacity = 0;
1693 return;
1694 }
1695
1696 if (scsi_host_dif_capable(sdp->host, type))
1697 sd_printk(KERN_NOTICE, sdkp,
1698 "Enabling DIF Type %u protection\n", type);
1699 else
1700 sd_printk(KERN_NOTICE, sdkp,
1701 "Disabling DIF Type %u protection\n", type);
1702 }
1703
1704 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1705 struct scsi_sense_hdr *sshdr, int sense_valid,
1706 int the_result)
1707 {
1708 sd_print_result(sdkp, the_result);
1709 if (driver_byte(the_result) & DRIVER_SENSE)
1710 sd_print_sense_hdr(sdkp, sshdr);
1711 else
1712 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1713
1714 /*
1715 * Set dirty bit for removable devices if not ready -
1716 * sometimes drives will not report this properly.
1717 */
1718 if (sdp->removable &&
1719 sense_valid && sshdr->sense_key == NOT_READY)
1720 set_media_not_present(sdkp);
1721
1722 /*
1723 * We used to set media_present to 0 here to indicate no media
1724 * in the drive, but some drives fail read capacity even with
1725 * media present, so we can't do that.
1726 */
1727 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1728 }
1729
1730 #define RC16_LEN 32
1731 #if RC16_LEN > SD_BUF_SIZE
1732 #error RC16_LEN must not be more than SD_BUF_SIZE
1733 #endif
1734
1735 #define READ_CAPACITY_RETRIES_ON_RESET 10
1736
1737 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1738 unsigned char *buffer)
1739 {
1740 unsigned char cmd[16];
1741 struct scsi_sense_hdr sshdr;
1742 int sense_valid = 0;
1743 int the_result;
1744 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1745 unsigned int alignment;
1746 unsigned long long lba;
1747 unsigned sector_size;
1748
1749 if (sdp->no_read_capacity_16)
1750 return -EINVAL;
1751
1752 do {
1753 memset(cmd, 0, 16);
1754 cmd[0] = SERVICE_ACTION_IN;
1755 cmd[1] = SAI_READ_CAPACITY_16;
1756 cmd[13] = RC16_LEN;
1757 memset(buffer, 0, RC16_LEN);
1758
1759 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1760 buffer, RC16_LEN, &sshdr,
1761 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1762
1763 if (media_not_present(sdkp, &sshdr))
1764 return -ENODEV;
1765
1766 if (the_result) {
1767 sense_valid = scsi_sense_valid(&sshdr);
1768 if (sense_valid &&
1769 sshdr.sense_key == ILLEGAL_REQUEST &&
1770 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1771 sshdr.ascq == 0x00)
1772 /* Invalid Command Operation Code or
1773 * Invalid Field in CDB, just retry
1774 * silently with RC10 */
1775 return -EINVAL;
1776 if (sense_valid &&
1777 sshdr.sense_key == UNIT_ATTENTION &&
1778 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1779 /* Device reset might occur several times,
1780 * give it one more chance */
1781 if (--reset_retries > 0)
1782 continue;
1783 }
1784 retries--;
1785
1786 } while (the_result && retries);
1787
1788 if (the_result) {
1789 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1790 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1791 return -EINVAL;
1792 }
1793
1794 sector_size = get_unaligned_be32(&buffer[8]);
1795 lba = get_unaligned_be64(&buffer[0]);
1796
1797 sd_read_protection_type(sdkp, buffer);
1798
1799 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1800 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1801 "kernel compiled with support for large block "
1802 "devices.\n");
1803 sdkp->capacity = 0;
1804 return -EOVERFLOW;
1805 }
1806
1807 /* Logical blocks per physical block exponent */
1808 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1809
1810 /* Lowest aligned logical block */
1811 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1812 blk_queue_alignment_offset(sdp->request_queue, alignment);
1813 if (alignment && sdkp->first_scan)
1814 sd_printk(KERN_NOTICE, sdkp,
1815 "physical block alignment offset: %u\n", alignment);
1816
1817 if (buffer[14] & 0x80) { /* LBPME */
1818 sdkp->lbpme = 1;
1819
1820 if (buffer[14] & 0x40) /* LBPRZ */
1821 sdkp->lbprz = 1;
1822
1823 sd_config_discard(sdkp, SD_LBP_WS16);
1824 }
1825
1826 sdkp->capacity = lba + 1;
1827 return sector_size;
1828 }
1829
1830 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1831 unsigned char *buffer)
1832 {
1833 unsigned char cmd[16];
1834 struct scsi_sense_hdr sshdr;
1835 int sense_valid = 0;
1836 int the_result;
1837 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1838 sector_t lba;
1839 unsigned sector_size;
1840
1841 do {
1842 cmd[0] = READ_CAPACITY;
1843 memset(&cmd[1], 0, 9);
1844 memset(buffer, 0, 8);
1845
1846 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1847 buffer, 8, &sshdr,
1848 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1849
1850 if (media_not_present(sdkp, &sshdr))
1851 return -ENODEV;
1852
1853 if (the_result) {
1854 sense_valid = scsi_sense_valid(&sshdr);
1855 if (sense_valid &&
1856 sshdr.sense_key == UNIT_ATTENTION &&
1857 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1858 /* Device reset might occur several times,
1859 * give it one more chance */
1860 if (--reset_retries > 0)
1861 continue;
1862 }
1863 retries--;
1864
1865 } while (the_result && retries);
1866
1867 if (the_result) {
1868 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1869 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1870 return -EINVAL;
1871 }
1872
1873 sector_size = get_unaligned_be32(&buffer[4]);
1874 lba = get_unaligned_be32(&buffer[0]);
1875
1876 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1877 /* Some buggy (usb cardreader) devices return an lba of
1878 0xffffffff when the want to report a size of 0 (with
1879 which they really mean no media is present) */
1880 sdkp->capacity = 0;
1881 sdkp->physical_block_size = sector_size;
1882 return sector_size;
1883 }
1884
1885 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1886 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1887 "kernel compiled with support for large block "
1888 "devices.\n");
1889 sdkp->capacity = 0;
1890 return -EOVERFLOW;
1891 }
1892
1893 sdkp->capacity = lba + 1;
1894 sdkp->physical_block_size = sector_size;
1895 return sector_size;
1896 }
1897
1898 static int sd_try_rc16_first(struct scsi_device *sdp)
1899 {
1900 if (sdp->host->max_cmd_len < 16)
1901 return 0;
1902 if (sdp->try_rc_10_first)
1903 return 0;
1904 if (sdp->scsi_level > SCSI_SPC_2)
1905 return 1;
1906 if (scsi_device_protection(sdp))
1907 return 1;
1908 return 0;
1909 }
1910
1911 /*
1912 * read disk capacity
1913 */
1914 static void
1915 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1916 {
1917 int sector_size;
1918 struct scsi_device *sdp = sdkp->device;
1919 sector_t old_capacity = sdkp->capacity;
1920
1921 if (sd_try_rc16_first(sdp)) {
1922 sector_size = read_capacity_16(sdkp, sdp, buffer);
1923 if (sector_size == -EOVERFLOW)
1924 goto got_data;
1925 if (sector_size == -ENODEV)
1926 return;
1927 if (sector_size < 0)
1928 sector_size = read_capacity_10(sdkp, sdp, buffer);
1929 if (sector_size < 0)
1930 return;
1931 } else {
1932 sector_size = read_capacity_10(sdkp, sdp, buffer);
1933 if (sector_size == -EOVERFLOW)
1934 goto got_data;
1935 if (sector_size < 0)
1936 return;
1937 if ((sizeof(sdkp->capacity) > 4) &&
1938 (sdkp->capacity > 0xffffffffULL)) {
1939 int old_sector_size = sector_size;
1940 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1941 "Trying to use READ CAPACITY(16).\n");
1942 sector_size = read_capacity_16(sdkp, sdp, buffer);
1943 if (sector_size < 0) {
1944 sd_printk(KERN_NOTICE, sdkp,
1945 "Using 0xffffffff as device size\n");
1946 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1947 sector_size = old_sector_size;
1948 goto got_data;
1949 }
1950 }
1951 }
1952
1953 /* Some devices are known to return the total number of blocks,
1954 * not the highest block number. Some devices have versions
1955 * which do this and others which do not. Some devices we might
1956 * suspect of doing this but we don't know for certain.
1957 *
1958 * If we know the reported capacity is wrong, decrement it. If
1959 * we can only guess, then assume the number of blocks is even
1960 * (usually true but not always) and err on the side of lowering
1961 * the capacity.
1962 */
1963 if (sdp->fix_capacity ||
1964 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1965 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1966 "from its reported value: %llu\n",
1967 (unsigned long long) sdkp->capacity);
1968 --sdkp->capacity;
1969 }
1970
1971 got_data:
1972 if (sector_size == 0) {
1973 sector_size = 512;
1974 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1975 "assuming 512.\n");
1976 }
1977
1978 if (sector_size != 512 &&
1979 sector_size != 1024 &&
1980 sector_size != 2048 &&
1981 sector_size != 4096 &&
1982 sector_size != 256) {
1983 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1984 sector_size);
1985 /*
1986 * The user might want to re-format the drive with
1987 * a supported sectorsize. Once this happens, it
1988 * would be relatively trivial to set the thing up.
1989 * For this reason, we leave the thing in the table.
1990 */
1991 sdkp->capacity = 0;
1992 /*
1993 * set a bogus sector size so the normal read/write
1994 * logic in the block layer will eventually refuse any
1995 * request on this device without tripping over power
1996 * of two sector size assumptions
1997 */
1998 sector_size = 512;
1999 }
2000 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2001
2002 {
2003 char cap_str_2[10], cap_str_10[10];
2004 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2005
2006 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2007 sizeof(cap_str_2));
2008 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2009 sizeof(cap_str_10));
2010
2011 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2012 sd_printk(KERN_NOTICE, sdkp,
2013 "%llu %d-byte logical blocks: (%s/%s)\n",
2014 (unsigned long long)sdkp->capacity,
2015 sector_size, cap_str_10, cap_str_2);
2016
2017 if (sdkp->physical_block_size != sector_size)
2018 sd_printk(KERN_NOTICE, sdkp,
2019 "%u-byte physical blocks\n",
2020 sdkp->physical_block_size);
2021 }
2022 }
2023
2024 /* Rescale capacity to 512-byte units */
2025 if (sector_size == 4096)
2026 sdkp->capacity <<= 3;
2027 else if (sector_size == 2048)
2028 sdkp->capacity <<= 2;
2029 else if (sector_size == 1024)
2030 sdkp->capacity <<= 1;
2031 else if (sector_size == 256)
2032 sdkp->capacity >>= 1;
2033
2034 blk_queue_physical_block_size(sdp->request_queue,
2035 sdkp->physical_block_size);
2036 sdkp->device->sector_size = sector_size;
2037 }
2038
2039 /* called with buffer of length 512 */
2040 static inline int
2041 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2042 unsigned char *buffer, int len, struct scsi_mode_data *data,
2043 struct scsi_sense_hdr *sshdr)
2044 {
2045 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2046 SD_TIMEOUT, SD_MAX_RETRIES, data,
2047 sshdr);
2048 }
2049
2050 /*
2051 * read write protect setting, if possible - called only in sd_revalidate_disk()
2052 * called with buffer of length SD_BUF_SIZE
2053 */
2054 static void
2055 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2056 {
2057 int res;
2058 struct scsi_device *sdp = sdkp->device;
2059 struct scsi_mode_data data;
2060 int old_wp = sdkp->write_prot;
2061
2062 set_disk_ro(sdkp->disk, 0);
2063 if (sdp->skip_ms_page_3f) {
2064 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2065 return;
2066 }
2067
2068 if (sdp->use_192_bytes_for_3f) {
2069 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2070 } else {
2071 /*
2072 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2073 * We have to start carefully: some devices hang if we ask
2074 * for more than is available.
2075 */
2076 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2077
2078 /*
2079 * Second attempt: ask for page 0 When only page 0 is
2080 * implemented, a request for page 3F may return Sense Key
2081 * 5: Illegal Request, Sense Code 24: Invalid field in
2082 * CDB.
2083 */
2084 if (!scsi_status_is_good(res))
2085 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2086
2087 /*
2088 * Third attempt: ask 255 bytes, as we did earlier.
2089 */
2090 if (!scsi_status_is_good(res))
2091 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2092 &data, NULL);
2093 }
2094
2095 if (!scsi_status_is_good(res)) {
2096 sd_printk(KERN_WARNING, sdkp,
2097 "Test WP failed, assume Write Enabled\n");
2098 } else {
2099 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2100 set_disk_ro(sdkp->disk, sdkp->write_prot);
2101 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2102 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2103 sdkp->write_prot ? "on" : "off");
2104 sd_printk(KERN_DEBUG, sdkp,
2105 "Mode Sense: %02x %02x %02x %02x\n",
2106 buffer[0], buffer[1], buffer[2], buffer[3]);
2107 }
2108 }
2109 }
2110
2111 /*
2112 * sd_read_cache_type - called only from sd_revalidate_disk()
2113 * called with buffer of length SD_BUF_SIZE
2114 */
2115 static void
2116 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2117 {
2118 int len = 0, res;
2119 struct scsi_device *sdp = sdkp->device;
2120
2121 int dbd;
2122 int modepage;
2123 int first_len;
2124 struct scsi_mode_data data;
2125 struct scsi_sense_hdr sshdr;
2126 int old_wce = sdkp->WCE;
2127 int old_rcd = sdkp->RCD;
2128 int old_dpofua = sdkp->DPOFUA;
2129
2130 first_len = 4;
2131 if (sdp->skip_ms_page_8) {
2132 if (sdp->type == TYPE_RBC)
2133 goto defaults;
2134 else {
2135 if (sdp->skip_ms_page_3f)
2136 goto defaults;
2137 modepage = 0x3F;
2138 if (sdp->use_192_bytes_for_3f)
2139 first_len = 192;
2140 dbd = 0;
2141 }
2142 } else if (sdp->type == TYPE_RBC) {
2143 modepage = 6;
2144 dbd = 8;
2145 } else {
2146 modepage = 8;
2147 dbd = 0;
2148 }
2149
2150 /* cautiously ask */
2151 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2152 &data, &sshdr);
2153
2154 if (!scsi_status_is_good(res))
2155 goto bad_sense;
2156
2157 if (!data.header_length) {
2158 modepage = 6;
2159 first_len = 0;
2160 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2161 }
2162
2163 /* that went OK, now ask for the proper length */
2164 len = data.length;
2165
2166 /*
2167 * We're only interested in the first three bytes, actually.
2168 * But the data cache page is defined for the first 20.
2169 */
2170 if (len < 3)
2171 goto bad_sense;
2172 else if (len > SD_BUF_SIZE) {
2173 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2174 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2175 len = SD_BUF_SIZE;
2176 }
2177 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2178 len = 192;
2179
2180 /* Get the data */
2181 if (len > first_len)
2182 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2183 &data, &sshdr);
2184
2185 if (scsi_status_is_good(res)) {
2186 int offset = data.header_length + data.block_descriptor_length;
2187
2188 while (offset < len) {
2189 u8 page_code = buffer[offset] & 0x3F;
2190 u8 spf = buffer[offset] & 0x40;
2191
2192 if (page_code == 8 || page_code == 6) {
2193 /* We're interested only in the first 3 bytes.
2194 */
2195 if (len - offset <= 2) {
2196 sd_printk(KERN_ERR, sdkp, "Incomplete "
2197 "mode parameter data\n");
2198 goto defaults;
2199 } else {
2200 modepage = page_code;
2201 goto Page_found;
2202 }
2203 } else {
2204 /* Go to the next page */
2205 if (spf && len - offset > 3)
2206 offset += 4 + (buffer[offset+2] << 8) +
2207 buffer[offset+3];
2208 else if (!spf && len - offset > 1)
2209 offset += 2 + buffer[offset+1];
2210 else {
2211 sd_printk(KERN_ERR, sdkp, "Incomplete "
2212 "mode parameter data\n");
2213 goto defaults;
2214 }
2215 }
2216 }
2217
2218 if (modepage == 0x3F) {
2219 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2220 "present\n");
2221 goto defaults;
2222 } else if ((buffer[offset] & 0x3f) != modepage) {
2223 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2224 goto defaults;
2225 }
2226 Page_found:
2227 if (modepage == 8) {
2228 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2229 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2230 } else {
2231 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2232 sdkp->RCD = 0;
2233 }
2234
2235 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2236 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2237 sd_printk(KERN_NOTICE, sdkp,
2238 "Uses READ/WRITE(6), disabling FUA\n");
2239 sdkp->DPOFUA = 0;
2240 }
2241
2242 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2243 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2244 sd_printk(KERN_NOTICE, sdkp,
2245 "Write cache: %s, read cache: %s, %s\n",
2246 sdkp->WCE ? "enabled" : "disabled",
2247 sdkp->RCD ? "disabled" : "enabled",
2248 sdkp->DPOFUA ? "supports DPO and FUA"
2249 : "doesn't support DPO or FUA");
2250
2251 return;
2252 }
2253
2254 bad_sense:
2255 if (scsi_sense_valid(&sshdr) &&
2256 sshdr.sense_key == ILLEGAL_REQUEST &&
2257 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2258 /* Invalid field in CDB */
2259 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2260 else
2261 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2262
2263 defaults:
2264 if (sdp->wce_default_on) {
2265 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2266 sdkp->WCE = 1;
2267 } else {
2268 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2269 sdkp->WCE = 0;
2270 }
2271 sdkp->RCD = 0;
2272 sdkp->DPOFUA = 0;
2273 }
2274
2275 /*
2276 * The ATO bit indicates whether the DIF application tag is available
2277 * for use by the operating system.
2278 */
2279 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2280 {
2281 int res, offset;
2282 struct scsi_device *sdp = sdkp->device;
2283 struct scsi_mode_data data;
2284 struct scsi_sense_hdr sshdr;
2285
2286 if (sdp->type != TYPE_DISK)
2287 return;
2288
2289 if (sdkp->protection_type == 0)
2290 return;
2291
2292 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2293 SD_MAX_RETRIES, &data, &sshdr);
2294
2295 if (!scsi_status_is_good(res) || !data.header_length ||
2296 data.length < 6) {
2297 sd_printk(KERN_WARNING, sdkp,
2298 "getting Control mode page failed, assume no ATO\n");
2299
2300 if (scsi_sense_valid(&sshdr))
2301 sd_print_sense_hdr(sdkp, &sshdr);
2302
2303 return;
2304 }
2305
2306 offset = data.header_length + data.block_descriptor_length;
2307
2308 if ((buffer[offset] & 0x3f) != 0x0a) {
2309 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2310 return;
2311 }
2312
2313 if ((buffer[offset + 5] & 0x80) == 0)
2314 return;
2315
2316 sdkp->ATO = 1;
2317
2318 return;
2319 }
2320
2321 /**
2322 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2323 * @disk: disk to query
2324 */
2325 static void sd_read_block_limits(struct scsi_disk *sdkp)
2326 {
2327 unsigned int sector_sz = sdkp->device->sector_size;
2328 const int vpd_len = 64;
2329 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2330
2331 if (!buffer ||
2332 /* Block Limits VPD */
2333 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2334 goto out;
2335
2336 blk_queue_io_min(sdkp->disk->queue,
2337 get_unaligned_be16(&buffer[6]) * sector_sz);
2338 blk_queue_io_opt(sdkp->disk->queue,
2339 get_unaligned_be32(&buffer[12]) * sector_sz);
2340
2341 if (buffer[3] == 0x3c) {
2342 unsigned int lba_count, desc_count;
2343
2344 sdkp->max_ws_blocks =
2345 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2346 (u64)0xffffffff);
2347
2348 if (!sdkp->lbpme)
2349 goto out;
2350
2351 lba_count = get_unaligned_be32(&buffer[20]);
2352 desc_count = get_unaligned_be32(&buffer[24]);
2353
2354 if (lba_count && desc_count)
2355 sdkp->max_unmap_blocks = lba_count;
2356
2357 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2358
2359 if (buffer[32] & 0x80)
2360 sdkp->unmap_alignment =
2361 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2362
2363 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2364
2365 if (sdkp->max_unmap_blocks)
2366 sd_config_discard(sdkp, SD_LBP_UNMAP);
2367 else
2368 sd_config_discard(sdkp, SD_LBP_WS16);
2369
2370 } else { /* LBP VPD page tells us what to use */
2371
2372 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2373 sd_config_discard(sdkp, SD_LBP_UNMAP);
2374 else if (sdkp->lbpws)
2375 sd_config_discard(sdkp, SD_LBP_WS16);
2376 else if (sdkp->lbpws10)
2377 sd_config_discard(sdkp, SD_LBP_WS10);
2378 else
2379 sd_config_discard(sdkp, SD_LBP_DISABLE);
2380 }
2381 }
2382
2383 out:
2384 kfree(buffer);
2385 }
2386
2387 /**
2388 * sd_read_block_characteristics - Query block dev. characteristics
2389 * @disk: disk to query
2390 */
2391 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2392 {
2393 unsigned char *buffer;
2394 u16 rot;
2395 const int vpd_len = 64;
2396
2397 buffer = kmalloc(vpd_len, GFP_KERNEL);
2398
2399 if (!buffer ||
2400 /* Block Device Characteristics VPD */
2401 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2402 goto out;
2403
2404 rot = get_unaligned_be16(&buffer[4]);
2405
2406 if (rot == 1)
2407 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2408
2409 out:
2410 kfree(buffer);
2411 }
2412
2413 /**
2414 * sd_read_block_provisioning - Query provisioning VPD page
2415 * @disk: disk to query
2416 */
2417 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2418 {
2419 unsigned char *buffer;
2420 const int vpd_len = 8;
2421
2422 if (sdkp->lbpme == 0)
2423 return;
2424
2425 buffer = kmalloc(vpd_len, GFP_KERNEL);
2426
2427 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2428 goto out;
2429
2430 sdkp->lbpvpd = 1;
2431 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2432 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2433 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2434
2435 out:
2436 kfree(buffer);
2437 }
2438
2439 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2440 {
2441 /*
2442 * Although VPD inquiries can go to SCSI-2 type devices,
2443 * some USB ones crash on receiving them, and the pages
2444 * we currently ask for are for SPC-3 and beyond
2445 */
2446 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2447 return 1;
2448 return 0;
2449 }
2450
2451 /**
2452 * sd_revalidate_disk - called the first time a new disk is seen,
2453 * performs disk spin up, read_capacity, etc.
2454 * @disk: struct gendisk we care about
2455 **/
2456 static int sd_revalidate_disk(struct gendisk *disk)
2457 {
2458 struct scsi_disk *sdkp = scsi_disk(disk);
2459 struct scsi_device *sdp = sdkp->device;
2460 unsigned char *buffer;
2461 unsigned flush = 0;
2462
2463 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2464 "sd_revalidate_disk\n"));
2465
2466 /*
2467 * If the device is offline, don't try and read capacity or any
2468 * of the other niceties.
2469 */
2470 if (!scsi_device_online(sdp))
2471 goto out;
2472
2473 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2474 if (!buffer) {
2475 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2476 "allocation failure.\n");
2477 goto out;
2478 }
2479
2480 sd_spinup_disk(sdkp);
2481
2482 /*
2483 * Without media there is no reason to ask; moreover, some devices
2484 * react badly if we do.
2485 */
2486 if (sdkp->media_present) {
2487 sd_read_capacity(sdkp, buffer);
2488
2489 if (sd_try_extended_inquiry(sdp)) {
2490 sd_read_block_provisioning(sdkp);
2491 sd_read_block_limits(sdkp);
2492 sd_read_block_characteristics(sdkp);
2493 }
2494
2495 sd_read_write_protect_flag(sdkp, buffer);
2496 sd_read_cache_type(sdkp, buffer);
2497 sd_read_app_tag_own(sdkp, buffer);
2498 }
2499
2500 sdkp->first_scan = 0;
2501
2502 /*
2503 * We now have all cache related info, determine how we deal
2504 * with flush requests.
2505 */
2506 if (sdkp->WCE) {
2507 flush |= REQ_FLUSH;
2508 if (sdkp->DPOFUA)
2509 flush |= REQ_FUA;
2510 }
2511
2512 blk_queue_flush(sdkp->disk->queue, flush);
2513
2514 set_capacity(disk, sdkp->capacity);
2515 kfree(buffer);
2516
2517 out:
2518 return 0;
2519 }
2520
2521 /**
2522 * sd_unlock_native_capacity - unlock native capacity
2523 * @disk: struct gendisk to set capacity for
2524 *
2525 * Block layer calls this function if it detects that partitions
2526 * on @disk reach beyond the end of the device. If the SCSI host
2527 * implements ->unlock_native_capacity() method, it's invoked to
2528 * give it a chance to adjust the device capacity.
2529 *
2530 * CONTEXT:
2531 * Defined by block layer. Might sleep.
2532 */
2533 static void sd_unlock_native_capacity(struct gendisk *disk)
2534 {
2535 struct scsi_device *sdev = scsi_disk(disk)->device;
2536
2537 if (sdev->host->hostt->unlock_native_capacity)
2538 sdev->host->hostt->unlock_native_capacity(sdev);
2539 }
2540
2541 /**
2542 * sd_format_disk_name - format disk name
2543 * @prefix: name prefix - ie. "sd" for SCSI disks
2544 * @index: index of the disk to format name for
2545 * @buf: output buffer
2546 * @buflen: length of the output buffer
2547 *
2548 * SCSI disk names starts at sda. The 26th device is sdz and the
2549 * 27th is sdaa. The last one for two lettered suffix is sdzz
2550 * which is followed by sdaaa.
2551 *
2552 * This is basically 26 base counting with one extra 'nil' entry
2553 * at the beginning from the second digit on and can be
2554 * determined using similar method as 26 base conversion with the
2555 * index shifted -1 after each digit is computed.
2556 *
2557 * CONTEXT:
2558 * Don't care.
2559 *
2560 * RETURNS:
2561 * 0 on success, -errno on failure.
2562 */
2563 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2564 {
2565 const int base = 'z' - 'a' + 1;
2566 char *begin = buf + strlen(prefix);
2567 char *end = buf + buflen;
2568 char *p;
2569 int unit;
2570
2571 p = end - 1;
2572 *p = '\0';
2573 unit = base;
2574 do {
2575 if (p == begin)
2576 return -EINVAL;
2577 *--p = 'a' + (index % unit);
2578 index = (index / unit) - 1;
2579 } while (index >= 0);
2580
2581 memmove(begin, p, end - p);
2582 memcpy(buf, prefix, strlen(prefix));
2583
2584 return 0;
2585 }
2586
2587 /*
2588 * The asynchronous part of sd_probe
2589 */
2590 static void sd_probe_async(void *data, async_cookie_t cookie)
2591 {
2592 struct scsi_disk *sdkp = data;
2593 struct scsi_device *sdp;
2594 struct gendisk *gd;
2595 u32 index;
2596 struct device *dev;
2597
2598 sdp = sdkp->device;
2599 gd = sdkp->disk;
2600 index = sdkp->index;
2601 dev = &sdp->sdev_gendev;
2602
2603 gd->major = sd_major((index & 0xf0) >> 4);
2604 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2605 gd->minors = SD_MINORS;
2606
2607 gd->fops = &sd_fops;
2608 gd->private_data = &sdkp->driver;
2609 gd->queue = sdkp->device->request_queue;
2610
2611 /* defaults, until the device tells us otherwise */
2612 sdp->sector_size = 512;
2613 sdkp->capacity = 0;
2614 sdkp->media_present = 1;
2615 sdkp->write_prot = 0;
2616 sdkp->WCE = 0;
2617 sdkp->RCD = 0;
2618 sdkp->ATO = 0;
2619 sdkp->first_scan = 1;
2620 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2621
2622 sd_revalidate_disk(gd);
2623
2624 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2625 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2626
2627 gd->driverfs_dev = &sdp->sdev_gendev;
2628 gd->flags = GENHD_FL_EXT_DEVT;
2629 if (sdp->removable) {
2630 gd->flags |= GENHD_FL_REMOVABLE;
2631 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2632 }
2633
2634 add_disk(gd);
2635 sd_dif_config_host(sdkp);
2636
2637 sd_revalidate_disk(gd);
2638
2639 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2640 sdp->removable ? "removable " : "");
2641 scsi_autopm_put_device(sdp);
2642 put_device(&sdkp->dev);
2643 }
2644
2645 /**
2646 * sd_probe - called during driver initialization and whenever a
2647 * new scsi device is attached to the system. It is called once
2648 * for each scsi device (not just disks) present.
2649 * @dev: pointer to device object
2650 *
2651 * Returns 0 if successful (or not interested in this scsi device
2652 * (e.g. scanner)); 1 when there is an error.
2653 *
2654 * Note: this function is invoked from the scsi mid-level.
2655 * This function sets up the mapping between a given
2656 * <host,channel,id,lun> (found in sdp) and new device name
2657 * (e.g. /dev/sda). More precisely it is the block device major
2658 * and minor number that is chosen here.
2659 *
2660 * Assume sd_probe is not re-entrant (for time being)
2661 * Also think about sd_probe() and sd_remove() running coincidentally.
2662 **/
2663 static int sd_probe(struct device *dev)
2664 {
2665 struct scsi_device *sdp = to_scsi_device(dev);
2666 struct scsi_disk *sdkp;
2667 struct gendisk *gd;
2668 int index;
2669 int error;
2670
2671 error = -ENODEV;
2672 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2673 goto out;
2674
2675 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2676 "sd_probe\n"));
2677
2678 error = -ENOMEM;
2679 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2680 if (!sdkp)
2681 goto out;
2682
2683 gd = alloc_disk(SD_MINORS);
2684 if (!gd)
2685 goto out_free;
2686
2687 do {
2688 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2689 goto out_put;
2690
2691 spin_lock(&sd_index_lock);
2692 error = ida_get_new(&sd_index_ida, &index);
2693 spin_unlock(&sd_index_lock);
2694 } while (error == -EAGAIN);
2695
2696 if (error) {
2697 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2698 goto out_put;
2699 }
2700
2701 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2702 if (error) {
2703 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2704 goto out_free_index;
2705 }
2706
2707 sdkp->device = sdp;
2708 sdkp->driver = &sd_template;
2709 sdkp->disk = gd;
2710 sdkp->index = index;
2711 atomic_set(&sdkp->openers, 0);
2712 atomic_set(&sdkp->device->ioerr_cnt, 0);
2713
2714 if (!sdp->request_queue->rq_timeout) {
2715 if (sdp->type != TYPE_MOD)
2716 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2717 else
2718 blk_queue_rq_timeout(sdp->request_queue,
2719 SD_MOD_TIMEOUT);
2720 }
2721
2722 device_initialize(&sdkp->dev);
2723 sdkp->dev.parent = dev;
2724 sdkp->dev.class = &sd_disk_class;
2725 dev_set_name(&sdkp->dev, dev_name(dev));
2726
2727 if (device_add(&sdkp->dev))
2728 goto out_free_index;
2729
2730 get_device(dev);
2731 dev_set_drvdata(dev, sdkp);
2732
2733 get_device(&sdkp->dev); /* prevent release before async_schedule */
2734 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2735
2736 return 0;
2737
2738 out_free_index:
2739 spin_lock(&sd_index_lock);
2740 ida_remove(&sd_index_ida, index);
2741 spin_unlock(&sd_index_lock);
2742 out_put:
2743 put_disk(gd);
2744 out_free:
2745 kfree(sdkp);
2746 out:
2747 return error;
2748 }
2749
2750 /**
2751 * sd_remove - called whenever a scsi disk (previously recognized by
2752 * sd_probe) is detached from the system. It is called (potentially
2753 * multiple times) during sd module unload.
2754 * @sdp: pointer to mid level scsi device object
2755 *
2756 * Note: this function is invoked from the scsi mid-level.
2757 * This function potentially frees up a device name (e.g. /dev/sdc)
2758 * that could be re-used by a subsequent sd_probe().
2759 * This function is not called when the built-in sd driver is "exit-ed".
2760 **/
2761 static int sd_remove(struct device *dev)
2762 {
2763 struct scsi_disk *sdkp;
2764
2765 sdkp = dev_get_drvdata(dev);
2766 scsi_autopm_get_device(sdkp->device);
2767
2768 async_synchronize_full_domain(&scsi_sd_probe_domain);
2769 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2770 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2771 device_del(&sdkp->dev);
2772 del_gendisk(sdkp->disk);
2773 sd_shutdown(dev);
2774
2775 mutex_lock(&sd_ref_mutex);
2776 dev_set_drvdata(dev, NULL);
2777 put_device(&sdkp->dev);
2778 mutex_unlock(&sd_ref_mutex);
2779
2780 return 0;
2781 }
2782
2783 /**
2784 * scsi_disk_release - Called to free the scsi_disk structure
2785 * @dev: pointer to embedded class device
2786 *
2787 * sd_ref_mutex must be held entering this routine. Because it is
2788 * called on last put, you should always use the scsi_disk_get()
2789 * scsi_disk_put() helpers which manipulate the semaphore directly
2790 * and never do a direct put_device.
2791 **/
2792 static void scsi_disk_release(struct device *dev)
2793 {
2794 struct scsi_disk *sdkp = to_scsi_disk(dev);
2795 struct gendisk *disk = sdkp->disk;
2796
2797 spin_lock(&sd_index_lock);
2798 ida_remove(&sd_index_ida, sdkp->index);
2799 spin_unlock(&sd_index_lock);
2800
2801 disk->private_data = NULL;
2802 put_disk(disk);
2803 put_device(&sdkp->device->sdev_gendev);
2804
2805 kfree(sdkp);
2806 }
2807
2808 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2809 {
2810 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2811 struct scsi_sense_hdr sshdr;
2812 struct scsi_device *sdp = sdkp->device;
2813 int res;
2814
2815 if (start)
2816 cmd[4] |= 1; /* START */
2817
2818 if (sdp->start_stop_pwr_cond)
2819 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2820
2821 if (!scsi_device_online(sdp))
2822 return -ENODEV;
2823
2824 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2825 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2826 if (res) {
2827 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2828 sd_print_result(sdkp, res);
2829 if (driver_byte(res) & DRIVER_SENSE)
2830 sd_print_sense_hdr(sdkp, &sshdr);
2831 }
2832
2833 return res;
2834 }
2835
2836 /*
2837 * Send a SYNCHRONIZE CACHE instruction down to the device through
2838 * the normal SCSI command structure. Wait for the command to
2839 * complete.
2840 */
2841 static void sd_shutdown(struct device *dev)
2842 {
2843 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2844
2845 if (!sdkp)
2846 return; /* this can happen */
2847
2848 if (pm_runtime_suspended(dev))
2849 goto exit;
2850
2851 if (sdkp->WCE) {
2852 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2853 sd_sync_cache(sdkp);
2854 }
2855
2856 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2857 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2858 sd_start_stop_device(sdkp, 0);
2859 }
2860
2861 exit:
2862 scsi_disk_put(sdkp);
2863 }
2864
2865 static int sd_suspend(struct device *dev, pm_message_t mesg)
2866 {
2867 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2868 int ret = 0;
2869
2870 if (!sdkp)
2871 return 0; /* this can happen */
2872
2873 if (sdkp->WCE) {
2874 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2875 ret = sd_sync_cache(sdkp);
2876 if (ret)
2877 goto done;
2878 }
2879
2880 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2881 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2882 ret = sd_start_stop_device(sdkp, 0);
2883 }
2884
2885 done:
2886 scsi_disk_put(sdkp);
2887 return ret;
2888 }
2889
2890 static int sd_resume(struct device *dev)
2891 {
2892 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2893 int ret = 0;
2894
2895 if (!sdkp->device->manage_start_stop)
2896 goto done;
2897
2898 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2899 ret = sd_start_stop_device(sdkp, 1);
2900
2901 done:
2902 scsi_disk_put(sdkp);
2903 return ret;
2904 }
2905
2906 /**
2907 * init_sd - entry point for this driver (both when built in or when
2908 * a module).
2909 *
2910 * Note: this function registers this driver with the scsi mid-level.
2911 **/
2912 static int __init init_sd(void)
2913 {
2914 int majors = 0, i, err;
2915
2916 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2917
2918 for (i = 0; i < SD_MAJORS; i++)
2919 if (register_blkdev(sd_major(i), "sd") == 0)
2920 majors++;
2921
2922 if (!majors)
2923 return -ENODEV;
2924
2925 err = class_register(&sd_disk_class);
2926 if (err)
2927 goto err_out;
2928
2929 err = scsi_register_driver(&sd_template.gendrv);
2930 if (err)
2931 goto err_out_class;
2932
2933 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2934 0, 0, NULL);
2935 if (!sd_cdb_cache) {
2936 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2937 goto err_out_class;
2938 }
2939
2940 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2941 if (!sd_cdb_pool) {
2942 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2943 goto err_out_cache;
2944 }
2945
2946 return 0;
2947
2948 err_out_cache:
2949 kmem_cache_destroy(sd_cdb_cache);
2950
2951 err_out_class:
2952 class_unregister(&sd_disk_class);
2953 err_out:
2954 for (i = 0; i < SD_MAJORS; i++)
2955 unregister_blkdev(sd_major(i), "sd");
2956 return err;
2957 }
2958
2959 /**
2960 * exit_sd - exit point for this driver (when it is a module).
2961 *
2962 * Note: this function unregisters this driver from the scsi mid-level.
2963 **/
2964 static void __exit exit_sd(void)
2965 {
2966 int i;
2967
2968 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2969
2970 mempool_destroy(sd_cdb_pool);
2971 kmem_cache_destroy(sd_cdb_cache);
2972
2973 scsi_unregister_driver(&sd_template.gendrv);
2974 class_unregister(&sd_disk_class);
2975
2976 for (i = 0; i < SD_MAJORS; i++)
2977 unregister_blkdev(sd_major(i), "sd");
2978 }
2979
2980 module_init(init_sd);
2981 module_exit(exit_sd);
2982
2983 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2984 struct scsi_sense_hdr *sshdr)
2985 {
2986 sd_printk(KERN_INFO, sdkp, " ");
2987 scsi_show_sense_hdr(sshdr);
2988 sd_printk(KERN_INFO, sdkp, " ");
2989 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2990 }
2991
2992 static void sd_print_result(struct scsi_disk *sdkp, int result)
2993 {
2994 sd_printk(KERN_INFO, sdkp, " ");
2995 scsi_show_result(result);
2996 }
2997
Linux kernel - Deliverables
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