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1 /*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
56
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
66
67 #include "sd.h"
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
70
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
74
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS 16
97 #else
98 #define SD_MINORS 0
99 #endif
100
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend_system(struct device *);
109 static int sd_suspend_runtime(struct device *);
110 static int sd_resume(struct device *);
111 static void sd_rescan(struct device *);
112 static int sd_done(struct scsi_cmnd *);
113 static int sd_eh_action(struct scsi_cmnd *, int);
114 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
115 static void scsi_disk_release(struct device *cdev);
116 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
117 static void sd_print_result(struct scsi_disk *, int);
118
119 static DEFINE_SPINLOCK(sd_index_lock);
120 static DEFINE_IDA(sd_index_ida);
121
122 /* This semaphore is used to mediate the 0->1 reference get in the
123 * face of object destruction (i.e. we can't allow a get on an
124 * object after last put) */
125 static DEFINE_MUTEX(sd_ref_mutex);
126
127 static struct kmem_cache *sd_cdb_cache;
128 static mempool_t *sd_cdb_pool;
129
130 static const char *sd_cache_types[] = {
131 "write through", "none", "write back",
132 "write back, no read (daft)"
133 };
134
135 static ssize_t
136 cache_type_store(struct device *dev, struct device_attribute *attr,
137 const char *buf, size_t count)
138 {
139 int i, ct = -1, rcd, wce, sp;
140 struct scsi_disk *sdkp = to_scsi_disk(dev);
141 struct scsi_device *sdp = sdkp->device;
142 char buffer[64];
143 char *buffer_data;
144 struct scsi_mode_data data;
145 struct scsi_sense_hdr sshdr;
146 static const char temp[] = "temporary ";
147 int len;
148
149 if (sdp->type != TYPE_DISK)
150 /* no cache control on RBC devices; theoretically they
151 * can do it, but there's probably so many exceptions
152 * it's not worth the risk */
153 return -EINVAL;
154
155 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
156 buf += sizeof(temp) - 1;
157 sdkp->cache_override = 1;
158 } else {
159 sdkp->cache_override = 0;
160 }
161
162 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
163 len = strlen(sd_cache_types[i]);
164 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
165 buf[len] == '\n') {
166 ct = i;
167 break;
168 }
169 }
170 if (ct < 0)
171 return -EINVAL;
172 rcd = ct & 0x01 ? 1 : 0;
173 wce = ct & 0x02 ? 1 : 0;
174
175 if (sdkp->cache_override) {
176 sdkp->WCE = wce;
177 sdkp->RCD = rcd;
178 return count;
179 }
180
181 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
182 SD_MAX_RETRIES, &data, NULL))
183 return -EINVAL;
184 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
185 data.block_descriptor_length);
186 buffer_data = buffer + data.header_length +
187 data.block_descriptor_length;
188 buffer_data[2] &= ~0x05;
189 buffer_data[2] |= wce << 2 | rcd;
190 sp = buffer_data[0] & 0x80 ? 1 : 0;
191
192 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
193 SD_MAX_RETRIES, &data, &sshdr)) {
194 if (scsi_sense_valid(&sshdr))
195 sd_print_sense_hdr(sdkp, &sshdr);
196 return -EINVAL;
197 }
198 revalidate_disk(sdkp->disk);
199 return count;
200 }
201
202 static ssize_t
203 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
204 char *buf)
205 {
206 struct scsi_disk *sdkp = to_scsi_disk(dev);
207 struct scsi_device *sdp = sdkp->device;
208
209 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
210 }
211
212 static ssize_t
213 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
214 const char *buf, size_t count)
215 {
216 struct scsi_disk *sdkp = to_scsi_disk(dev);
217 struct scsi_device *sdp = sdkp->device;
218
219 if (!capable(CAP_SYS_ADMIN))
220 return -EACCES;
221
222 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
223
224 return count;
225 }
226 static DEVICE_ATTR_RW(manage_start_stop);
227
228 static ssize_t
229 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
230 {
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232
233 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
234 }
235
236 static ssize_t
237 allow_restart_store(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t count)
239 {
240 struct scsi_disk *sdkp = to_scsi_disk(dev);
241 struct scsi_device *sdp = sdkp->device;
242
243 if (!capable(CAP_SYS_ADMIN))
244 return -EACCES;
245
246 if (sdp->type != TYPE_DISK)
247 return -EINVAL;
248
249 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
250
251 return count;
252 }
253 static DEVICE_ATTR_RW(allow_restart);
254
255 static ssize_t
256 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
257 {
258 struct scsi_disk *sdkp = to_scsi_disk(dev);
259 int ct = sdkp->RCD + 2*sdkp->WCE;
260
261 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
262 }
263 static DEVICE_ATTR_RW(cache_type);
264
265 static ssize_t
266 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
267 {
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269
270 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
271 }
272 static DEVICE_ATTR_RO(FUA);
273
274 static ssize_t
275 protection_type_show(struct device *dev, struct device_attribute *attr,
276 char *buf)
277 {
278 struct scsi_disk *sdkp = to_scsi_disk(dev);
279
280 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
281 }
282
283 static ssize_t
284 protection_type_store(struct device *dev, struct device_attribute *attr,
285 const char *buf, size_t count)
286 {
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
288 unsigned int val;
289 int err;
290
291 if (!capable(CAP_SYS_ADMIN))
292 return -EACCES;
293
294 err = kstrtouint(buf, 10, &val);
295
296 if (err)
297 return err;
298
299 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
300 sdkp->protection_type = val;
301
302 return count;
303 }
304 static DEVICE_ATTR_RW(protection_type);
305
306 static ssize_t
307 protection_mode_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309 {
310 struct scsi_disk *sdkp = to_scsi_disk(dev);
311 struct scsi_device *sdp = sdkp->device;
312 unsigned int dif, dix;
313
314 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
315 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
316
317 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
318 dif = 0;
319 dix = 1;
320 }
321
322 if (!dif && !dix)
323 return snprintf(buf, 20, "none\n");
324
325 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
326 }
327 static DEVICE_ATTR_RO(protection_mode);
328
329 static ssize_t
330 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
331 {
332 struct scsi_disk *sdkp = to_scsi_disk(dev);
333
334 return snprintf(buf, 20, "%u\n", sdkp->ATO);
335 }
336 static DEVICE_ATTR_RO(app_tag_own);
337
338 static ssize_t
339 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
340 char *buf)
341 {
342 struct scsi_disk *sdkp = to_scsi_disk(dev);
343
344 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
345 }
346 static DEVICE_ATTR_RO(thin_provisioning);
347
348 static const char *lbp_mode[] = {
349 [SD_LBP_FULL] = "full",
350 [SD_LBP_UNMAP] = "unmap",
351 [SD_LBP_WS16] = "writesame_16",
352 [SD_LBP_WS10] = "writesame_10",
353 [SD_LBP_ZERO] = "writesame_zero",
354 [SD_LBP_DISABLE] = "disabled",
355 };
356
357 static ssize_t
358 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
359 char *buf)
360 {
361 struct scsi_disk *sdkp = to_scsi_disk(dev);
362
363 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
364 }
365
366 static ssize_t
367 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
368 const char *buf, size_t count)
369 {
370 struct scsi_disk *sdkp = to_scsi_disk(dev);
371 struct scsi_device *sdp = sdkp->device;
372
373 if (!capable(CAP_SYS_ADMIN))
374 return -EACCES;
375
376 if (sdp->type != TYPE_DISK)
377 return -EINVAL;
378
379 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
380 sd_config_discard(sdkp, SD_LBP_UNMAP);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
382 sd_config_discard(sdkp, SD_LBP_WS16);
383 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
384 sd_config_discard(sdkp, SD_LBP_WS10);
385 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
386 sd_config_discard(sdkp, SD_LBP_ZERO);
387 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
388 sd_config_discard(sdkp, SD_LBP_DISABLE);
389 else
390 return -EINVAL;
391
392 return count;
393 }
394 static DEVICE_ATTR_RW(provisioning_mode);
395
396 static ssize_t
397 max_medium_access_timeouts_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
399 {
400 struct scsi_disk *sdkp = to_scsi_disk(dev);
401
402 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
403 }
404
405 static ssize_t
406 max_medium_access_timeouts_store(struct device *dev,
407 struct device_attribute *attr, const char *buf,
408 size_t count)
409 {
410 struct scsi_disk *sdkp = to_scsi_disk(dev);
411 int err;
412
413 if (!capable(CAP_SYS_ADMIN))
414 return -EACCES;
415
416 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
417
418 return err ? err : count;
419 }
420 static DEVICE_ATTR_RW(max_medium_access_timeouts);
421
422 static ssize_t
423 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
424 char *buf)
425 {
426 struct scsi_disk *sdkp = to_scsi_disk(dev);
427
428 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
429 }
430
431 static ssize_t
432 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
433 const char *buf, size_t count)
434 {
435 struct scsi_disk *sdkp = to_scsi_disk(dev);
436 struct scsi_device *sdp = sdkp->device;
437 unsigned long max;
438 int err;
439
440 if (!capable(CAP_SYS_ADMIN))
441 return -EACCES;
442
443 if (sdp->type != TYPE_DISK)
444 return -EINVAL;
445
446 err = kstrtoul(buf, 10, &max);
447
448 if (err)
449 return err;
450
451 if (max == 0)
452 sdp->no_write_same = 1;
453 else if (max <= SD_MAX_WS16_BLOCKS) {
454 sdp->no_write_same = 0;
455 sdkp->max_ws_blocks = max;
456 }
457
458 sd_config_write_same(sdkp);
459
460 return count;
461 }
462 static DEVICE_ATTR_RW(max_write_same_blocks);
463
464 static struct attribute *sd_disk_attrs[] = {
465 &dev_attr_cache_type.attr,
466 &dev_attr_FUA.attr,
467 &dev_attr_allow_restart.attr,
468 &dev_attr_manage_start_stop.attr,
469 &dev_attr_protection_type.attr,
470 &dev_attr_protection_mode.attr,
471 &dev_attr_app_tag_own.attr,
472 &dev_attr_thin_provisioning.attr,
473 &dev_attr_provisioning_mode.attr,
474 &dev_attr_max_write_same_blocks.attr,
475 &dev_attr_max_medium_access_timeouts.attr,
476 NULL,
477 };
478 ATTRIBUTE_GROUPS(sd_disk);
479
480 static struct class sd_disk_class = {
481 .name = "scsi_disk",
482 .owner = THIS_MODULE,
483 .dev_release = scsi_disk_release,
484 .dev_groups = sd_disk_groups,
485 };
486
487 static const struct dev_pm_ops sd_pm_ops = {
488 .suspend = sd_suspend_system,
489 .resume = sd_resume,
490 .poweroff = sd_suspend_system,
491 .restore = sd_resume,
492 .runtime_suspend = sd_suspend_runtime,
493 .runtime_resume = sd_resume,
494 };
495
496 static struct scsi_driver sd_template = {
497 .owner = THIS_MODULE,
498 .gendrv = {
499 .name = "sd",
500 .probe = sd_probe,
501 .remove = sd_remove,
502 .shutdown = sd_shutdown,
503 .pm = &sd_pm_ops,
504 },
505 .rescan = sd_rescan,
506 .done = sd_done,
507 .eh_action = sd_eh_action,
508 };
509
510 /*
511 * Dummy kobj_map->probe function.
512 * The default ->probe function will call modprobe, which is
513 * pointless as this module is already loaded.
514 */
515 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
516 {
517 return NULL;
518 }
519
520 /*
521 * Device no to disk mapping:
522 *
523 * major disc2 disc p1
524 * |............|.............|....|....| <- dev_t
525 * 31 20 19 8 7 4 3 0
526 *
527 * Inside a major, we have 16k disks, however mapped non-
528 * contiguously. The first 16 disks are for major0, the next
529 * ones with major1, ... Disk 256 is for major0 again, disk 272
530 * for major1, ...
531 * As we stay compatible with our numbering scheme, we can reuse
532 * the well-know SCSI majors 8, 65--71, 136--143.
533 */
534 static int sd_major(int major_idx)
535 {
536 switch (major_idx) {
537 case 0:
538 return SCSI_DISK0_MAJOR;
539 case 1 ... 7:
540 return SCSI_DISK1_MAJOR + major_idx - 1;
541 case 8 ... 15:
542 return SCSI_DISK8_MAJOR + major_idx - 8;
543 default:
544 BUG();
545 return 0; /* shut up gcc */
546 }
547 }
548
549 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
550 {
551 struct scsi_disk *sdkp = NULL;
552
553 if (disk->private_data) {
554 sdkp = scsi_disk(disk);
555 if (scsi_device_get(sdkp->device) == 0)
556 get_device(&sdkp->dev);
557 else
558 sdkp = NULL;
559 }
560 return sdkp;
561 }
562
563 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
564 {
565 struct scsi_disk *sdkp;
566
567 mutex_lock(&sd_ref_mutex);
568 sdkp = __scsi_disk_get(disk);
569 mutex_unlock(&sd_ref_mutex);
570 return sdkp;
571 }
572
573 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
574 {
575 struct scsi_disk *sdkp;
576
577 mutex_lock(&sd_ref_mutex);
578 sdkp = dev_get_drvdata(dev);
579 if (sdkp)
580 sdkp = __scsi_disk_get(sdkp->disk);
581 mutex_unlock(&sd_ref_mutex);
582 return sdkp;
583 }
584
585 static void scsi_disk_put(struct scsi_disk *sdkp)
586 {
587 struct scsi_device *sdev = sdkp->device;
588
589 mutex_lock(&sd_ref_mutex);
590 put_device(&sdkp->dev);
591 scsi_device_put(sdev);
592 mutex_unlock(&sd_ref_mutex);
593 }
594
595 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
596 {
597 unsigned int prot_op = SCSI_PROT_NORMAL;
598 unsigned int dix = scsi_prot_sg_count(scmd);
599
600 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
601 if (dif && dix)
602 prot_op = SCSI_PROT_READ_PASS;
603 else if (dif && !dix)
604 prot_op = SCSI_PROT_READ_STRIP;
605 else if (!dif && dix)
606 prot_op = SCSI_PROT_READ_INSERT;
607 } else {
608 if (dif && dix)
609 prot_op = SCSI_PROT_WRITE_PASS;
610 else if (dif && !dix)
611 prot_op = SCSI_PROT_WRITE_INSERT;
612 else if (!dif && dix)
613 prot_op = SCSI_PROT_WRITE_STRIP;
614 }
615
616 scsi_set_prot_op(scmd, prot_op);
617 scsi_set_prot_type(scmd, dif);
618 }
619
620 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
621 {
622 struct request_queue *q = sdkp->disk->queue;
623 unsigned int logical_block_size = sdkp->device->sector_size;
624 unsigned int max_blocks = 0;
625
626 q->limits.discard_zeroes_data = sdkp->lbprz;
627 q->limits.discard_alignment = sdkp->unmap_alignment *
628 logical_block_size;
629 q->limits.discard_granularity =
630 max(sdkp->physical_block_size,
631 sdkp->unmap_granularity * logical_block_size);
632
633 sdkp->provisioning_mode = mode;
634
635 switch (mode) {
636
637 case SD_LBP_DISABLE:
638 q->limits.max_discard_sectors = 0;
639 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
640 return;
641
642 case SD_LBP_UNMAP:
643 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
644 (u32)SD_MAX_WS16_BLOCKS);
645 break;
646
647 case SD_LBP_WS16:
648 max_blocks = min_not_zero(sdkp->max_ws_blocks,
649 (u32)SD_MAX_WS16_BLOCKS);
650 break;
651
652 case SD_LBP_WS10:
653 max_blocks = min_not_zero(sdkp->max_ws_blocks,
654 (u32)SD_MAX_WS10_BLOCKS);
655 break;
656
657 case SD_LBP_ZERO:
658 max_blocks = min_not_zero(sdkp->max_ws_blocks,
659 (u32)SD_MAX_WS10_BLOCKS);
660 q->limits.discard_zeroes_data = 1;
661 break;
662 }
663
664 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
665 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
666 }
667
668 /**
669 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
670 * @sdp: scsi device to operate one
671 * @rq: Request to prepare
672 *
673 * Will issue either UNMAP or WRITE SAME(16) depending on preference
674 * indicated by target device.
675 **/
676 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
677 {
678 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
679 sector_t sector = blk_rq_pos(rq);
680 unsigned int nr_sectors = blk_rq_sectors(rq);
681 unsigned int nr_bytes = blk_rq_bytes(rq);
682 unsigned int len;
683 int ret;
684 char *buf;
685 struct page *page;
686
687 sector >>= ilog2(sdp->sector_size) - 9;
688 nr_sectors >>= ilog2(sdp->sector_size) - 9;
689 rq->timeout = SD_TIMEOUT;
690
691 memset(rq->cmd, 0, rq->cmd_len);
692
693 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
694 if (!page)
695 return BLKPREP_DEFER;
696
697 switch (sdkp->provisioning_mode) {
698 case SD_LBP_UNMAP:
699 buf = page_address(page);
700
701 rq->cmd_len = 10;
702 rq->cmd[0] = UNMAP;
703 rq->cmd[8] = 24;
704
705 put_unaligned_be16(6 + 16, &buf[0]);
706 put_unaligned_be16(16, &buf[2]);
707 put_unaligned_be64(sector, &buf[8]);
708 put_unaligned_be32(nr_sectors, &buf[16]);
709
710 len = 24;
711 break;
712
713 case SD_LBP_WS16:
714 rq->cmd_len = 16;
715 rq->cmd[0] = WRITE_SAME_16;
716 rq->cmd[1] = 0x8; /* UNMAP */
717 put_unaligned_be64(sector, &rq->cmd[2]);
718 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
719
720 len = sdkp->device->sector_size;
721 break;
722
723 case SD_LBP_WS10:
724 case SD_LBP_ZERO:
725 rq->cmd_len = 10;
726 rq->cmd[0] = WRITE_SAME;
727 if (sdkp->provisioning_mode == SD_LBP_WS10)
728 rq->cmd[1] = 0x8; /* UNMAP */
729 put_unaligned_be32(sector, &rq->cmd[2]);
730 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
731
732 len = sdkp->device->sector_size;
733 break;
734
735 default:
736 ret = BLKPREP_KILL;
737 goto out;
738 }
739
740 blk_add_request_payload(rq, page, len);
741 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
742 rq->__data_len = nr_bytes;
743
744 out:
745 if (ret != BLKPREP_OK)
746 __free_page(page);
747 return ret;
748 }
749
750 static void sd_config_write_same(struct scsi_disk *sdkp)
751 {
752 struct request_queue *q = sdkp->disk->queue;
753 unsigned int logical_block_size = sdkp->device->sector_size;
754
755 if (sdkp->device->no_write_same) {
756 sdkp->max_ws_blocks = 0;
757 goto out;
758 }
759
760 /* Some devices can not handle block counts above 0xffff despite
761 * supporting WRITE SAME(16). Consequently we default to 64k
762 * blocks per I/O unless the device explicitly advertises a
763 * bigger limit.
764 */
765 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
766 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
767 (u32)SD_MAX_WS16_BLOCKS);
768 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
769 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
770 (u32)SD_MAX_WS10_BLOCKS);
771 else {
772 sdkp->device->no_write_same = 1;
773 sdkp->max_ws_blocks = 0;
774 }
775
776 out:
777 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
778 (logical_block_size >> 9));
779 }
780
781 /**
782 * sd_setup_write_same_cmnd - write the same data to multiple blocks
783 * @sdp: scsi device to operate one
784 * @rq: Request to prepare
785 *
786 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
787 * preference indicated by target device.
788 **/
789 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
790 {
791 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
792 struct bio *bio = rq->bio;
793 sector_t sector = blk_rq_pos(rq);
794 unsigned int nr_sectors = blk_rq_sectors(rq);
795 unsigned int nr_bytes = blk_rq_bytes(rq);
796 int ret;
797
798 if (sdkp->device->no_write_same)
799 return BLKPREP_KILL;
800
801 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
802
803 sector >>= ilog2(sdp->sector_size) - 9;
804 nr_sectors >>= ilog2(sdp->sector_size) - 9;
805
806 rq->__data_len = sdp->sector_size;
807 rq->timeout = SD_WRITE_SAME_TIMEOUT;
808 memset(rq->cmd, 0, rq->cmd_len);
809
810 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
811 rq->cmd_len = 16;
812 rq->cmd[0] = WRITE_SAME_16;
813 put_unaligned_be64(sector, &rq->cmd[2]);
814 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
815 } else {
816 rq->cmd_len = 10;
817 rq->cmd[0] = WRITE_SAME;
818 put_unaligned_be32(sector, &rq->cmd[2]);
819 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
820 }
821
822 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
823 rq->__data_len = nr_bytes;
824
825 return ret;
826 }
827
828 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
829 {
830 rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
831 rq->retries = SD_MAX_RETRIES;
832 rq->cmd[0] = SYNCHRONIZE_CACHE;
833 rq->cmd_len = 10;
834
835 return scsi_setup_blk_pc_cmnd(sdp, rq);
836 }
837
838 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
839 {
840 struct scsi_cmnd *SCpnt = rq->special;
841
842 if (rq->cmd_flags & REQ_DISCARD) {
843 struct bio *bio = rq->bio;
844
845 __free_page(bio->bi_io_vec->bv_page);
846 }
847 if (SCpnt->cmnd != rq->cmd) {
848 mempool_free(SCpnt->cmnd, sd_cdb_pool);
849 SCpnt->cmnd = NULL;
850 SCpnt->cmd_len = 0;
851 }
852 }
853
854 /**
855 * sd_prep_fn - build a scsi (read or write) command from
856 * information in the request structure.
857 * @SCpnt: pointer to mid-level's per scsi command structure that
858 * contains request and into which the scsi command is written
859 *
860 * Returns 1 if successful and 0 if error (or cannot be done now).
861 **/
862 static int sd_prep_fn(struct request_queue *q, struct request *rq)
863 {
864 struct scsi_cmnd *SCpnt;
865 struct scsi_device *sdp = q->queuedata;
866 struct gendisk *disk = rq->rq_disk;
867 struct scsi_disk *sdkp;
868 sector_t block = blk_rq_pos(rq);
869 sector_t threshold;
870 unsigned int this_count = blk_rq_sectors(rq);
871 int ret, host_dif;
872 unsigned char protect;
873
874 /*
875 * Discard request come in as REQ_TYPE_FS but we turn them into
876 * block PC requests to make life easier.
877 */
878 if (rq->cmd_flags & REQ_DISCARD) {
879 ret = sd_setup_discard_cmnd(sdp, rq);
880 goto out;
881 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
882 ret = sd_setup_write_same_cmnd(sdp, rq);
883 goto out;
884 } else if (rq->cmd_flags & REQ_FLUSH) {
885 ret = scsi_setup_flush_cmnd(sdp, rq);
886 goto out;
887 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
888 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
889 goto out;
890 } else if (rq->cmd_type != REQ_TYPE_FS) {
891 ret = BLKPREP_KILL;
892 goto out;
893 }
894 ret = scsi_setup_fs_cmnd(sdp, rq);
895 if (ret != BLKPREP_OK)
896 goto out;
897 SCpnt = rq->special;
898 sdkp = scsi_disk(disk);
899
900 /* from here on until we're complete, any goto out
901 * is used for a killable error condition */
902 ret = BLKPREP_KILL;
903
904 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
905 "sd_prep_fn: block=%llu, "
906 "count=%d\n",
907 (unsigned long long)block,
908 this_count));
909
910 if (!sdp || !scsi_device_online(sdp) ||
911 block + blk_rq_sectors(rq) > get_capacity(disk)) {
912 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
913 "Finishing %u sectors\n",
914 blk_rq_sectors(rq)));
915 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
916 "Retry with 0x%p\n", SCpnt));
917 goto out;
918 }
919
920 if (sdp->changed) {
921 /*
922 * quietly refuse to do anything to a changed disc until
923 * the changed bit has been reset
924 */
925 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
926 goto out;
927 }
928
929 /*
930 * Some SD card readers can't handle multi-sector accesses which touch
931 * the last one or two hardware sectors. Split accesses as needed.
932 */
933 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
934 (sdp->sector_size / 512);
935
936 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
937 if (block < threshold) {
938 /* Access up to the threshold but not beyond */
939 this_count = threshold - block;
940 } else {
941 /* Access only a single hardware sector */
942 this_count = sdp->sector_size / 512;
943 }
944 }
945
946 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
947 (unsigned long long)block));
948
949 /*
950 * If we have a 1K hardware sectorsize, prevent access to single
951 * 512 byte sectors. In theory we could handle this - in fact
952 * the scsi cdrom driver must be able to handle this because
953 * we typically use 1K blocksizes, and cdroms typically have
954 * 2K hardware sectorsizes. Of course, things are simpler
955 * with the cdrom, since it is read-only. For performance
956 * reasons, the filesystems should be able to handle this
957 * and not force the scsi disk driver to use bounce buffers
958 * for this.
959 */
960 if (sdp->sector_size == 1024) {
961 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
964 goto out;
965 } else {
966 block = block >> 1;
967 this_count = this_count >> 1;
968 }
969 }
970 if (sdp->sector_size == 2048) {
971 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
972 scmd_printk(KERN_ERR, SCpnt,
973 "Bad block number requested\n");
974 goto out;
975 } else {
976 block = block >> 2;
977 this_count = this_count >> 2;
978 }
979 }
980 if (sdp->sector_size == 4096) {
981 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
982 scmd_printk(KERN_ERR, SCpnt,
983 "Bad block number requested\n");
984 goto out;
985 } else {
986 block = block >> 3;
987 this_count = this_count >> 3;
988 }
989 }
990 if (rq_data_dir(rq) == WRITE) {
991 if (!sdp->writeable) {
992 goto out;
993 }
994 SCpnt->cmnd[0] = WRITE_6;
995 SCpnt->sc_data_direction = DMA_TO_DEVICE;
996
997 if (blk_integrity_rq(rq))
998 sd_dif_prepare(rq, block, sdp->sector_size);
999
1000 } else if (rq_data_dir(rq) == READ) {
1001 SCpnt->cmnd[0] = READ_6;
1002 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1003 } else {
1004 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1005 goto out;
1006 }
1007
1008 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1009 "%s %d/%u 512 byte blocks.\n",
1010 (rq_data_dir(rq) == WRITE) ?
1011 "writing" : "reading", this_count,
1012 blk_rq_sectors(rq)));
1013
1014 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1015 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1016 if (host_dif)
1017 protect = 1 << 5;
1018 else
1019 protect = 0;
1020
1021 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1022 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1023
1024 if (unlikely(SCpnt->cmnd == NULL)) {
1025 ret = BLKPREP_DEFER;
1026 goto out;
1027 }
1028
1029 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1030 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1031 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1032 SCpnt->cmnd[7] = 0x18;
1033 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1034 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1035
1036 /* LBA */
1037 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1038 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1039 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1040 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1041 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1042 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1043 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1044 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1045
1046 /* Expected Indirect LBA */
1047 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1048 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1049 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1050 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1051
1052 /* Transfer length */
1053 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1054 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1055 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1056 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1057 } else if (sdp->use_16_for_rw) {
1058 SCpnt->cmnd[0] += READ_16 - READ_6;
1059 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1060 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1061 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1062 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1063 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1064 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1065 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1066 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1067 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1068 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1069 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1070 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1071 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1072 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1073 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1074 scsi_device_protection(SCpnt->device) ||
1075 SCpnt->device->use_10_for_rw) {
1076 if (this_count > 0xffff)
1077 this_count = 0xffff;
1078
1079 SCpnt->cmnd[0] += READ_10 - READ_6;
1080 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1081 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1082 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1083 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1084 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1085 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1086 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1087 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1088 } else {
1089 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1090 /*
1091 * This happens only if this drive failed
1092 * 10byte rw command with ILLEGAL_REQUEST
1093 * during operation and thus turned off
1094 * use_10_for_rw.
1095 */
1096 scmd_printk(KERN_ERR, SCpnt,
1097 "FUA write on READ/WRITE(6) drive\n");
1098 goto out;
1099 }
1100
1101 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1102 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1103 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1104 SCpnt->cmnd[4] = (unsigned char) this_count;
1105 SCpnt->cmnd[5] = 0;
1106 }
1107 SCpnt->sdb.length = this_count * sdp->sector_size;
1108
1109 /* If DIF or DIX is enabled, tell HBA how to handle request */
1110 if (host_dif || scsi_prot_sg_count(SCpnt))
1111 sd_prot_op(SCpnt, host_dif);
1112
1113 /*
1114 * We shouldn't disconnect in the middle of a sector, so with a dumb
1115 * host adapter, it's safe to assume that we can at least transfer
1116 * this many bytes between each connect / disconnect.
1117 */
1118 SCpnt->transfersize = sdp->sector_size;
1119 SCpnt->underflow = this_count << 9;
1120 SCpnt->allowed = SD_MAX_RETRIES;
1121
1122 /*
1123 * This indicates that the command is ready from our end to be
1124 * queued.
1125 */
1126 ret = BLKPREP_OK;
1127 out:
1128 return scsi_prep_return(q, rq, ret);
1129 }
1130
1131 /**
1132 * sd_open - open a scsi disk device
1133 * @inode: only i_rdev member may be used
1134 * @filp: only f_mode and f_flags may be used
1135 *
1136 * Returns 0 if successful. Returns a negated errno value in case
1137 * of error.
1138 *
1139 * Note: This can be called from a user context (e.g. fsck(1) )
1140 * or from within the kernel (e.g. as a result of a mount(1) ).
1141 * In the latter case @inode and @filp carry an abridged amount
1142 * of information as noted above.
1143 *
1144 * Locking: called with bdev->bd_mutex held.
1145 **/
1146 static int sd_open(struct block_device *bdev, fmode_t mode)
1147 {
1148 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1149 struct scsi_device *sdev;
1150 int retval;
1151
1152 if (!sdkp)
1153 return -ENXIO;
1154
1155 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1156
1157 sdev = sdkp->device;
1158
1159 /*
1160 * If the device is in error recovery, wait until it is done.
1161 * If the device is offline, then disallow any access to it.
1162 */
1163 retval = -ENXIO;
1164 if (!scsi_block_when_processing_errors(sdev))
1165 goto error_out;
1166
1167 if (sdev->removable || sdkp->write_prot)
1168 check_disk_change(bdev);
1169
1170 /*
1171 * If the drive is empty, just let the open fail.
1172 */
1173 retval = -ENOMEDIUM;
1174 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1175 goto error_out;
1176
1177 /*
1178 * If the device has the write protect tab set, have the open fail
1179 * if the user expects to be able to write to the thing.
1180 */
1181 retval = -EROFS;
1182 if (sdkp->write_prot && (mode & FMODE_WRITE))
1183 goto error_out;
1184
1185 /*
1186 * It is possible that the disk changing stuff resulted in
1187 * the device being taken offline. If this is the case,
1188 * report this to the user, and don't pretend that the
1189 * open actually succeeded.
1190 */
1191 retval = -ENXIO;
1192 if (!scsi_device_online(sdev))
1193 goto error_out;
1194
1195 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1196 if (scsi_block_when_processing_errors(sdev))
1197 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1198 }
1199
1200 return 0;
1201
1202 error_out:
1203 scsi_disk_put(sdkp);
1204 return retval;
1205 }
1206
1207 /**
1208 * sd_release - invoked when the (last) close(2) is called on this
1209 * scsi disk.
1210 * @inode: only i_rdev member may be used
1211 * @filp: only f_mode and f_flags may be used
1212 *
1213 * Returns 0.
1214 *
1215 * Note: may block (uninterruptible) if error recovery is underway
1216 * on this disk.
1217 *
1218 * Locking: called with bdev->bd_mutex held.
1219 **/
1220 static void sd_release(struct gendisk *disk, fmode_t mode)
1221 {
1222 struct scsi_disk *sdkp = scsi_disk(disk);
1223 struct scsi_device *sdev = sdkp->device;
1224
1225 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1226
1227 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1228 if (scsi_block_when_processing_errors(sdev))
1229 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1230 }
1231
1232 /*
1233 * XXX and what if there are packets in flight and this close()
1234 * XXX is followed by a "rmmod sd_mod"?
1235 */
1236
1237 scsi_disk_put(sdkp);
1238 }
1239
1240 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1241 {
1242 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1243 struct scsi_device *sdp = sdkp->device;
1244 struct Scsi_Host *host = sdp->host;
1245 int diskinfo[4];
1246
1247 /* default to most commonly used values */
1248 diskinfo[0] = 0x40; /* 1 << 6 */
1249 diskinfo[1] = 0x20; /* 1 << 5 */
1250 diskinfo[2] = sdkp->capacity >> 11;
1251
1252 /* override with calculated, extended default, or driver values */
1253 if (host->hostt->bios_param)
1254 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1255 else
1256 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1257
1258 geo->heads = diskinfo[0];
1259 geo->sectors = diskinfo[1];
1260 geo->cylinders = diskinfo[2];
1261 return 0;
1262 }
1263
1264 /**
1265 * sd_ioctl - process an ioctl
1266 * @inode: only i_rdev/i_bdev members may be used
1267 * @filp: only f_mode and f_flags may be used
1268 * @cmd: ioctl command number
1269 * @arg: this is third argument given to ioctl(2) system call.
1270 * Often contains a pointer.
1271 *
1272 * Returns 0 if successful (some ioctls return positive numbers on
1273 * success as well). Returns a negated errno value in case of error.
1274 *
1275 * Note: most ioctls are forward onto the block subsystem or further
1276 * down in the scsi subsystem.
1277 **/
1278 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1279 unsigned int cmd, unsigned long arg)
1280 {
1281 struct gendisk *disk = bdev->bd_disk;
1282 struct scsi_disk *sdkp = scsi_disk(disk);
1283 struct scsi_device *sdp = sdkp->device;
1284 void __user *p = (void __user *)arg;
1285 int error;
1286
1287 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1288 "cmd=0x%x\n", disk->disk_name, cmd));
1289
1290 error = scsi_verify_blk_ioctl(bdev, cmd);
1291 if (error < 0)
1292 return error;
1293
1294 /*
1295 * If we are in the middle of error recovery, don't let anyone
1296 * else try and use this device. Also, if error recovery fails, it
1297 * may try and take the device offline, in which case all further
1298 * access to the device is prohibited.
1299 */
1300 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1301 (mode & FMODE_NDELAY) != 0);
1302 if (!scsi_block_when_processing_errors(sdp) || !error)
1303 goto out;
1304
1305 /*
1306 * Send SCSI addressing ioctls directly to mid level, send other
1307 * ioctls to block level and then onto mid level if they can't be
1308 * resolved.
1309 */
1310 switch (cmd) {
1311 case SCSI_IOCTL_GET_IDLUN:
1312 case SCSI_IOCTL_GET_BUS_NUMBER:
1313 error = scsi_ioctl(sdp, cmd, p);
1314 break;
1315 default:
1316 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1317 if (error != -ENOTTY)
1318 break;
1319 error = scsi_ioctl(sdp, cmd, p);
1320 break;
1321 }
1322 out:
1323 return error;
1324 }
1325
1326 static void set_media_not_present(struct scsi_disk *sdkp)
1327 {
1328 if (sdkp->media_present)
1329 sdkp->device->changed = 1;
1330
1331 if (sdkp->device->removable) {
1332 sdkp->media_present = 0;
1333 sdkp->capacity = 0;
1334 }
1335 }
1336
1337 static int media_not_present(struct scsi_disk *sdkp,
1338 struct scsi_sense_hdr *sshdr)
1339 {
1340 if (!scsi_sense_valid(sshdr))
1341 return 0;
1342
1343 /* not invoked for commands that could return deferred errors */
1344 switch (sshdr->sense_key) {
1345 case UNIT_ATTENTION:
1346 case NOT_READY:
1347 /* medium not present */
1348 if (sshdr->asc == 0x3A) {
1349 set_media_not_present(sdkp);
1350 return 1;
1351 }
1352 }
1353 return 0;
1354 }
1355
1356 /**
1357 * sd_check_events - check media events
1358 * @disk: kernel device descriptor
1359 * @clearing: disk events currently being cleared
1360 *
1361 * Returns mask of DISK_EVENT_*.
1362 *
1363 * Note: this function is invoked from the block subsystem.
1364 **/
1365 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1366 {
1367 struct scsi_disk *sdkp = scsi_disk(disk);
1368 struct scsi_device *sdp = sdkp->device;
1369 struct scsi_sense_hdr *sshdr = NULL;
1370 int retval;
1371
1372 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1373
1374 /*
1375 * If the device is offline, don't send any commands - just pretend as
1376 * if the command failed. If the device ever comes back online, we
1377 * can deal with it then. It is only because of unrecoverable errors
1378 * that we would ever take a device offline in the first place.
1379 */
1380 if (!scsi_device_online(sdp)) {
1381 set_media_not_present(sdkp);
1382 goto out;
1383 }
1384
1385 /*
1386 * Using TEST_UNIT_READY enables differentiation between drive with
1387 * no cartridge loaded - NOT READY, drive with changed cartridge -
1388 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1389 *
1390 * Drives that auto spin down. eg iomega jaz 1G, will be started
1391 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1392 * sd_revalidate() is called.
1393 */
1394 retval = -ENODEV;
1395
1396 if (scsi_block_when_processing_errors(sdp)) {
1397 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1398 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1399 sshdr);
1400 }
1401
1402 /* failed to execute TUR, assume media not present */
1403 if (host_byte(retval)) {
1404 set_media_not_present(sdkp);
1405 goto out;
1406 }
1407
1408 if (media_not_present(sdkp, sshdr))
1409 goto out;
1410
1411 /*
1412 * For removable scsi disk we have to recognise the presence
1413 * of a disk in the drive.
1414 */
1415 if (!sdkp->media_present)
1416 sdp->changed = 1;
1417 sdkp->media_present = 1;
1418 out:
1419 /*
1420 * sdp->changed is set under the following conditions:
1421 *
1422 * Medium present state has changed in either direction.
1423 * Device has indicated UNIT_ATTENTION.
1424 */
1425 kfree(sshdr);
1426 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1427 sdp->changed = 0;
1428 return retval;
1429 }
1430
1431 static int sd_sync_cache(struct scsi_disk *sdkp)
1432 {
1433 int retries, res;
1434 struct scsi_device *sdp = sdkp->device;
1435 const int timeout = sdp->request_queue->rq_timeout
1436 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1437 struct scsi_sense_hdr sshdr;
1438
1439 if (!scsi_device_online(sdp))
1440 return -ENODEV;
1441
1442 for (retries = 3; retries > 0; --retries) {
1443 unsigned char cmd[10] = { 0 };
1444
1445 cmd[0] = SYNCHRONIZE_CACHE;
1446 /*
1447 * Leave the rest of the command zero to indicate
1448 * flush everything.
1449 */
1450 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1451 &sshdr, timeout, SD_MAX_RETRIES,
1452 NULL, REQ_PM);
1453 if (res == 0)
1454 break;
1455 }
1456
1457 if (res) {
1458 sd_print_result(sdkp, res);
1459
1460 if (driver_byte(res) & DRIVER_SENSE)
1461 sd_print_sense_hdr(sdkp, &sshdr);
1462 /* we need to evaluate the error return */
1463 if (scsi_sense_valid(&sshdr) &&
1464 (sshdr.asc == 0x3a || /* medium not present */
1465 sshdr.asc == 0x20)) /* invalid command */
1466 /* this is no error here */
1467 return 0;
1468
1469 switch (host_byte(res)) {
1470 /* ignore errors due to racing a disconnection */
1471 case DID_BAD_TARGET:
1472 case DID_NO_CONNECT:
1473 return 0;
1474 /* signal the upper layer it might try again */
1475 case DID_BUS_BUSY:
1476 case DID_IMM_RETRY:
1477 case DID_REQUEUE:
1478 case DID_SOFT_ERROR:
1479 return -EBUSY;
1480 default:
1481 return -EIO;
1482 }
1483 }
1484 return 0;
1485 }
1486
1487 static void sd_rescan(struct device *dev)
1488 {
1489 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1490
1491 if (sdkp) {
1492 revalidate_disk(sdkp->disk);
1493 scsi_disk_put(sdkp);
1494 }
1495 }
1496
1497
1498 #ifdef CONFIG_COMPAT
1499 /*
1500 * This gets directly called from VFS. When the ioctl
1501 * is not recognized we go back to the other translation paths.
1502 */
1503 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1504 unsigned int cmd, unsigned long arg)
1505 {
1506 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1507 int ret;
1508
1509 ret = scsi_verify_blk_ioctl(bdev, cmd);
1510 if (ret < 0)
1511 return ret;
1512
1513 /*
1514 * If we are in the middle of error recovery, don't let anyone
1515 * else try and use this device. Also, if error recovery fails, it
1516 * may try and take the device offline, in which case all further
1517 * access to the device is prohibited.
1518 */
1519 if (!scsi_block_when_processing_errors(sdev))
1520 return -ENODEV;
1521
1522 if (sdev->host->hostt->compat_ioctl) {
1523 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1524
1525 return ret;
1526 }
1527
1528 /*
1529 * Let the static ioctl translation table take care of it.
1530 */
1531 return -ENOIOCTLCMD;
1532 }
1533 #endif
1534
1535 static const struct block_device_operations sd_fops = {
1536 .owner = THIS_MODULE,
1537 .open = sd_open,
1538 .release = sd_release,
1539 .ioctl = sd_ioctl,
1540 .getgeo = sd_getgeo,
1541 #ifdef CONFIG_COMPAT
1542 .compat_ioctl = sd_compat_ioctl,
1543 #endif
1544 .check_events = sd_check_events,
1545 .revalidate_disk = sd_revalidate_disk,
1546 .unlock_native_capacity = sd_unlock_native_capacity,
1547 };
1548
1549 /**
1550 * sd_eh_action - error handling callback
1551 * @scmd: sd-issued command that has failed
1552 * @eh_disp: The recovery disposition suggested by the midlayer
1553 *
1554 * This function is called by the SCSI midlayer upon completion of an
1555 * error test command (currently TEST UNIT READY). The result of sending
1556 * the eh command is passed in eh_disp. We're looking for devices that
1557 * fail medium access commands but are OK with non access commands like
1558 * test unit ready (so wrongly see the device as having a successful
1559 * recovery)
1560 **/
1561 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1562 {
1563 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1564
1565 if (!scsi_device_online(scmd->device) ||
1566 !scsi_medium_access_command(scmd) ||
1567 host_byte(scmd->result) != DID_TIME_OUT ||
1568 eh_disp != SUCCESS)
1569 return eh_disp;
1570
1571 /*
1572 * The device has timed out executing a medium access command.
1573 * However, the TEST UNIT READY command sent during error
1574 * handling completed successfully. Either the device is in the
1575 * process of recovering or has it suffered an internal failure
1576 * that prevents access to the storage medium.
1577 */
1578 sdkp->medium_access_timed_out++;
1579
1580 /*
1581 * If the device keeps failing read/write commands but TEST UNIT
1582 * READY always completes successfully we assume that medium
1583 * access is no longer possible and take the device offline.
1584 */
1585 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1586 scmd_printk(KERN_ERR, scmd,
1587 "Medium access timeout failure. Offlining disk!\n");
1588 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1589
1590 return FAILED;
1591 }
1592
1593 return eh_disp;
1594 }
1595
1596 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1597 {
1598 u64 start_lba = blk_rq_pos(scmd->request);
1599 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1600 u64 bad_lba;
1601 int info_valid;
1602 /*
1603 * resid is optional but mostly filled in. When it's unused,
1604 * its value is zero, so we assume the whole buffer transferred
1605 */
1606 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1607 unsigned int good_bytes;
1608
1609 if (scmd->request->cmd_type != REQ_TYPE_FS)
1610 return 0;
1611
1612 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1613 SCSI_SENSE_BUFFERSIZE,
1614 &bad_lba);
1615 if (!info_valid)
1616 return 0;
1617
1618 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1619 return 0;
1620
1621 if (scmd->device->sector_size < 512) {
1622 /* only legitimate sector_size here is 256 */
1623 start_lba <<= 1;
1624 end_lba <<= 1;
1625 } else {
1626 /* be careful ... don't want any overflows */
1627 unsigned int factor = scmd->device->sector_size / 512;
1628 do_div(start_lba, factor);
1629 do_div(end_lba, factor);
1630 }
1631
1632 /* The bad lba was reported incorrectly, we have no idea where
1633 * the error is.
1634 */
1635 if (bad_lba < start_lba || bad_lba >= end_lba)
1636 return 0;
1637
1638 /* This computation should always be done in terms of
1639 * the resolution of the device's medium.
1640 */
1641 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1642 return min(good_bytes, transferred);
1643 }
1644
1645 /**
1646 * sd_done - bottom half handler: called when the lower level
1647 * driver has completed (successfully or otherwise) a scsi command.
1648 * @SCpnt: mid-level's per command structure.
1649 *
1650 * Note: potentially run from within an ISR. Must not block.
1651 **/
1652 static int sd_done(struct scsi_cmnd *SCpnt)
1653 {
1654 int result = SCpnt->result;
1655 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1656 struct scsi_sense_hdr sshdr;
1657 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1658 struct request *req = SCpnt->request;
1659 int sense_valid = 0;
1660 int sense_deferred = 0;
1661 unsigned char op = SCpnt->cmnd[0];
1662 unsigned char unmap = SCpnt->cmnd[1] & 8;
1663
1664 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1665 if (!result) {
1666 good_bytes = blk_rq_bytes(req);
1667 scsi_set_resid(SCpnt, 0);
1668 } else {
1669 good_bytes = 0;
1670 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1671 }
1672 }
1673
1674 if (result) {
1675 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1676 if (sense_valid)
1677 sense_deferred = scsi_sense_is_deferred(&sshdr);
1678 }
1679 #ifdef CONFIG_SCSI_LOGGING
1680 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1681 if (sense_valid) {
1682 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1683 "sd_done: sb[respc,sk,asc,"
1684 "ascq]=%x,%x,%x,%x\n",
1685 sshdr.response_code,
1686 sshdr.sense_key, sshdr.asc,
1687 sshdr.ascq));
1688 }
1689 #endif
1690 if (driver_byte(result) != DRIVER_SENSE &&
1691 (!sense_valid || sense_deferred))
1692 goto out;
1693
1694 sdkp->medium_access_timed_out = 0;
1695
1696 switch (sshdr.sense_key) {
1697 case HARDWARE_ERROR:
1698 case MEDIUM_ERROR:
1699 good_bytes = sd_completed_bytes(SCpnt);
1700 break;
1701 case RECOVERED_ERROR:
1702 good_bytes = scsi_bufflen(SCpnt);
1703 break;
1704 case NO_SENSE:
1705 /* This indicates a false check condition, so ignore it. An
1706 * unknown amount of data was transferred so treat it as an
1707 * error.
1708 */
1709 scsi_print_sense("sd", SCpnt);
1710 SCpnt->result = 0;
1711 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1712 break;
1713 case ABORTED_COMMAND:
1714 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1715 good_bytes = sd_completed_bytes(SCpnt);
1716 break;
1717 case ILLEGAL_REQUEST:
1718 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1719 good_bytes = sd_completed_bytes(SCpnt);
1720 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1721 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1722 switch (op) {
1723 case UNMAP:
1724 sd_config_discard(sdkp, SD_LBP_DISABLE);
1725 break;
1726 case WRITE_SAME_16:
1727 case WRITE_SAME:
1728 if (unmap)
1729 sd_config_discard(sdkp, SD_LBP_DISABLE);
1730 else {
1731 sdkp->device->no_write_same = 1;
1732 sd_config_write_same(sdkp);
1733
1734 good_bytes = 0;
1735 req->__data_len = blk_rq_bytes(req);
1736 req->cmd_flags |= REQ_QUIET;
1737 }
1738 }
1739 }
1740 break;
1741 default:
1742 break;
1743 }
1744 out:
1745 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1746 sd_dif_complete(SCpnt, good_bytes);
1747
1748 return good_bytes;
1749 }
1750
1751 /*
1752 * spinup disk - called only in sd_revalidate_disk()
1753 */
1754 static void
1755 sd_spinup_disk(struct scsi_disk *sdkp)
1756 {
1757 unsigned char cmd[10];
1758 unsigned long spintime_expire = 0;
1759 int retries, spintime;
1760 unsigned int the_result;
1761 struct scsi_sense_hdr sshdr;
1762 int sense_valid = 0;
1763
1764 spintime = 0;
1765
1766 /* Spin up drives, as required. Only do this at boot time */
1767 /* Spinup needs to be done for module loads too. */
1768 do {
1769 retries = 0;
1770
1771 do {
1772 cmd[0] = TEST_UNIT_READY;
1773 memset((void *) &cmd[1], 0, 9);
1774
1775 the_result = scsi_execute_req(sdkp->device, cmd,
1776 DMA_NONE, NULL, 0,
1777 &sshdr, SD_TIMEOUT,
1778 SD_MAX_RETRIES, NULL);
1779
1780 /*
1781 * If the drive has indicated to us that it
1782 * doesn't have any media in it, don't bother
1783 * with any more polling.
1784 */
1785 if (media_not_present(sdkp, &sshdr))
1786 return;
1787
1788 if (the_result)
1789 sense_valid = scsi_sense_valid(&sshdr);
1790 retries++;
1791 } while (retries < 3 &&
1792 (!scsi_status_is_good(the_result) ||
1793 ((driver_byte(the_result) & DRIVER_SENSE) &&
1794 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1795
1796 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1797 /* no sense, TUR either succeeded or failed
1798 * with a status error */
1799 if(!spintime && !scsi_status_is_good(the_result)) {
1800 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1801 sd_print_result(sdkp, the_result);
1802 }
1803 break;
1804 }
1805
1806 /*
1807 * The device does not want the automatic start to be issued.
1808 */
1809 if (sdkp->device->no_start_on_add)
1810 break;
1811
1812 if (sense_valid && sshdr.sense_key == NOT_READY) {
1813 if (sshdr.asc == 4 && sshdr.ascq == 3)
1814 break; /* manual intervention required */
1815 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1816 break; /* standby */
1817 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1818 break; /* unavailable */
1819 /*
1820 * Issue command to spin up drive when not ready
1821 */
1822 if (!spintime) {
1823 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1824 cmd[0] = START_STOP;
1825 cmd[1] = 1; /* Return immediately */
1826 memset((void *) &cmd[2], 0, 8);
1827 cmd[4] = 1; /* Start spin cycle */
1828 if (sdkp->device->start_stop_pwr_cond)
1829 cmd[4] |= 1 << 4;
1830 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1831 NULL, 0, &sshdr,
1832 SD_TIMEOUT, SD_MAX_RETRIES,
1833 NULL);
1834 spintime_expire = jiffies + 100 * HZ;
1835 spintime = 1;
1836 }
1837 /* Wait 1 second for next try */
1838 msleep(1000);
1839 printk(".");
1840
1841 /*
1842 * Wait for USB flash devices with slow firmware.
1843 * Yes, this sense key/ASC combination shouldn't
1844 * occur here. It's characteristic of these devices.
1845 */
1846 } else if (sense_valid &&
1847 sshdr.sense_key == UNIT_ATTENTION &&
1848 sshdr.asc == 0x28) {
1849 if (!spintime) {
1850 spintime_expire = jiffies + 5 * HZ;
1851 spintime = 1;
1852 }
1853 /* Wait 1 second for next try */
1854 msleep(1000);
1855 } else {
1856 /* we don't understand the sense code, so it's
1857 * probably pointless to loop */
1858 if(!spintime) {
1859 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1860 sd_print_sense_hdr(sdkp, &sshdr);
1861 }
1862 break;
1863 }
1864
1865 } while (spintime && time_before_eq(jiffies, spintime_expire));
1866
1867 if (spintime) {
1868 if (scsi_status_is_good(the_result))
1869 printk("ready\n");
1870 else
1871 printk("not responding...\n");
1872 }
1873 }
1874
1875
1876 /*
1877 * Determine whether disk supports Data Integrity Field.
1878 */
1879 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1880 {
1881 struct scsi_device *sdp = sdkp->device;
1882 u8 type;
1883 int ret = 0;
1884
1885 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1886 return ret;
1887
1888 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1889
1890 if (type > SD_DIF_TYPE3_PROTECTION)
1891 ret = -ENODEV;
1892 else if (scsi_host_dif_capable(sdp->host, type))
1893 ret = 1;
1894
1895 if (sdkp->first_scan || type != sdkp->protection_type)
1896 switch (ret) {
1897 case -ENODEV:
1898 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1899 " protection type %u. Disabling disk!\n",
1900 type);
1901 break;
1902 case 1:
1903 sd_printk(KERN_NOTICE, sdkp,
1904 "Enabling DIF Type %u protection\n", type);
1905 break;
1906 case 0:
1907 sd_printk(KERN_NOTICE, sdkp,
1908 "Disabling DIF Type %u protection\n", type);
1909 break;
1910 }
1911
1912 sdkp->protection_type = type;
1913
1914 return ret;
1915 }
1916
1917 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1918 struct scsi_sense_hdr *sshdr, int sense_valid,
1919 int the_result)
1920 {
1921 sd_print_result(sdkp, the_result);
1922 if (driver_byte(the_result) & DRIVER_SENSE)
1923 sd_print_sense_hdr(sdkp, sshdr);
1924 else
1925 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1926
1927 /*
1928 * Set dirty bit for removable devices if not ready -
1929 * sometimes drives will not report this properly.
1930 */
1931 if (sdp->removable &&
1932 sense_valid && sshdr->sense_key == NOT_READY)
1933 set_media_not_present(sdkp);
1934
1935 /*
1936 * We used to set media_present to 0 here to indicate no media
1937 * in the drive, but some drives fail read capacity even with
1938 * media present, so we can't do that.
1939 */
1940 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1941 }
1942
1943 #define RC16_LEN 32
1944 #if RC16_LEN > SD_BUF_SIZE
1945 #error RC16_LEN must not be more than SD_BUF_SIZE
1946 #endif
1947
1948 #define READ_CAPACITY_RETRIES_ON_RESET 10
1949
1950 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1951 unsigned char *buffer)
1952 {
1953 unsigned char cmd[16];
1954 struct scsi_sense_hdr sshdr;
1955 int sense_valid = 0;
1956 int the_result;
1957 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1958 unsigned int alignment;
1959 unsigned long long lba;
1960 unsigned sector_size;
1961
1962 if (sdp->no_read_capacity_16)
1963 return -EINVAL;
1964
1965 do {
1966 memset(cmd, 0, 16);
1967 cmd[0] = SERVICE_ACTION_IN;
1968 cmd[1] = SAI_READ_CAPACITY_16;
1969 cmd[13] = RC16_LEN;
1970 memset(buffer, 0, RC16_LEN);
1971
1972 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1973 buffer, RC16_LEN, &sshdr,
1974 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1975
1976 if (media_not_present(sdkp, &sshdr))
1977 return -ENODEV;
1978
1979 if (the_result) {
1980 sense_valid = scsi_sense_valid(&sshdr);
1981 if (sense_valid &&
1982 sshdr.sense_key == ILLEGAL_REQUEST &&
1983 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1984 sshdr.ascq == 0x00)
1985 /* Invalid Command Operation Code or
1986 * Invalid Field in CDB, just retry
1987 * silently with RC10 */
1988 return -EINVAL;
1989 if (sense_valid &&
1990 sshdr.sense_key == UNIT_ATTENTION &&
1991 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1992 /* Device reset might occur several times,
1993 * give it one more chance */
1994 if (--reset_retries > 0)
1995 continue;
1996 }
1997 retries--;
1998
1999 } while (the_result && retries);
2000
2001 if (the_result) {
2002 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
2003 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2004 return -EINVAL;
2005 }
2006
2007 sector_size = get_unaligned_be32(&buffer[8]);
2008 lba = get_unaligned_be64(&buffer[0]);
2009
2010 if (sd_read_protection_type(sdkp, buffer) < 0) {
2011 sdkp->capacity = 0;
2012 return -ENODEV;
2013 }
2014
2015 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2016 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2017 "kernel compiled with support for large block "
2018 "devices.\n");
2019 sdkp->capacity = 0;
2020 return -EOVERFLOW;
2021 }
2022
2023 /* Logical blocks per physical block exponent */
2024 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2025
2026 /* Lowest aligned logical block */
2027 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2028 blk_queue_alignment_offset(sdp->request_queue, alignment);
2029 if (alignment && sdkp->first_scan)
2030 sd_printk(KERN_NOTICE, sdkp,
2031 "physical block alignment offset: %u\n", alignment);
2032
2033 if (buffer[14] & 0x80) { /* LBPME */
2034 sdkp->lbpme = 1;
2035
2036 if (buffer[14] & 0x40) /* LBPRZ */
2037 sdkp->lbprz = 1;
2038
2039 sd_config_discard(sdkp, SD_LBP_WS16);
2040 }
2041
2042 sdkp->capacity = lba + 1;
2043 return sector_size;
2044 }
2045
2046 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2047 unsigned char *buffer)
2048 {
2049 unsigned char cmd[16];
2050 struct scsi_sense_hdr sshdr;
2051 int sense_valid = 0;
2052 int the_result;
2053 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2054 sector_t lba;
2055 unsigned sector_size;
2056
2057 do {
2058 cmd[0] = READ_CAPACITY;
2059 memset(&cmd[1], 0, 9);
2060 memset(buffer, 0, 8);
2061
2062 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2063 buffer, 8, &sshdr,
2064 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2065
2066 if (media_not_present(sdkp, &sshdr))
2067 return -ENODEV;
2068
2069 if (the_result) {
2070 sense_valid = scsi_sense_valid(&sshdr);
2071 if (sense_valid &&
2072 sshdr.sense_key == UNIT_ATTENTION &&
2073 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2074 /* Device reset might occur several times,
2075 * give it one more chance */
2076 if (--reset_retries > 0)
2077 continue;
2078 }
2079 retries--;
2080
2081 } while (the_result && retries);
2082
2083 if (the_result) {
2084 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2085 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2086 return -EINVAL;
2087 }
2088
2089 sector_size = get_unaligned_be32(&buffer[4]);
2090 lba = get_unaligned_be32(&buffer[0]);
2091
2092 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2093 /* Some buggy (usb cardreader) devices return an lba of
2094 0xffffffff when the want to report a size of 0 (with
2095 which they really mean no media is present) */
2096 sdkp->capacity = 0;
2097 sdkp->physical_block_size = sector_size;
2098 return sector_size;
2099 }
2100
2101 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2102 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2103 "kernel compiled with support for large block "
2104 "devices.\n");
2105 sdkp->capacity = 0;
2106 return -EOVERFLOW;
2107 }
2108
2109 sdkp->capacity = lba + 1;
2110 sdkp->physical_block_size = sector_size;
2111 return sector_size;
2112 }
2113
2114 static int sd_try_rc16_first(struct scsi_device *sdp)
2115 {
2116 if (sdp->host->max_cmd_len < 16)
2117 return 0;
2118 if (sdp->try_rc_10_first)
2119 return 0;
2120 if (sdp->scsi_level > SCSI_SPC_2)
2121 return 1;
2122 if (scsi_device_protection(sdp))
2123 return 1;
2124 return 0;
2125 }
2126
2127 /*
2128 * read disk capacity
2129 */
2130 static void
2131 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2132 {
2133 int sector_size;
2134 struct scsi_device *sdp = sdkp->device;
2135 sector_t old_capacity = sdkp->capacity;
2136
2137 if (sd_try_rc16_first(sdp)) {
2138 sector_size = read_capacity_16(sdkp, sdp, buffer);
2139 if (sector_size == -EOVERFLOW)
2140 goto got_data;
2141 if (sector_size == -ENODEV)
2142 return;
2143 if (sector_size < 0)
2144 sector_size = read_capacity_10(sdkp, sdp, buffer);
2145 if (sector_size < 0)
2146 return;
2147 } else {
2148 sector_size = read_capacity_10(sdkp, sdp, buffer);
2149 if (sector_size == -EOVERFLOW)
2150 goto got_data;
2151 if (sector_size < 0)
2152 return;
2153 if ((sizeof(sdkp->capacity) > 4) &&
2154 (sdkp->capacity > 0xffffffffULL)) {
2155 int old_sector_size = sector_size;
2156 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2157 "Trying to use READ CAPACITY(16).\n");
2158 sector_size = read_capacity_16(sdkp, sdp, buffer);
2159 if (sector_size < 0) {
2160 sd_printk(KERN_NOTICE, sdkp,
2161 "Using 0xffffffff as device size\n");
2162 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2163 sector_size = old_sector_size;
2164 goto got_data;
2165 }
2166 }
2167 }
2168
2169 /* Some devices are known to return the total number of blocks,
2170 * not the highest block number. Some devices have versions
2171 * which do this and others which do not. Some devices we might
2172 * suspect of doing this but we don't know for certain.
2173 *
2174 * If we know the reported capacity is wrong, decrement it. If
2175 * we can only guess, then assume the number of blocks is even
2176 * (usually true but not always) and err on the side of lowering
2177 * the capacity.
2178 */
2179 if (sdp->fix_capacity ||
2180 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2181 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2182 "from its reported value: %llu\n",
2183 (unsigned long long) sdkp->capacity);
2184 --sdkp->capacity;
2185 }
2186
2187 got_data:
2188 if (sector_size == 0) {
2189 sector_size = 512;
2190 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2191 "assuming 512.\n");
2192 }
2193
2194 if (sector_size != 512 &&
2195 sector_size != 1024 &&
2196 sector_size != 2048 &&
2197 sector_size != 4096 &&
2198 sector_size != 256) {
2199 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2200 sector_size);
2201 /*
2202 * The user might want to re-format the drive with
2203 * a supported sectorsize. Once this happens, it
2204 * would be relatively trivial to set the thing up.
2205 * For this reason, we leave the thing in the table.
2206 */
2207 sdkp->capacity = 0;
2208 /*
2209 * set a bogus sector size so the normal read/write
2210 * logic in the block layer will eventually refuse any
2211 * request on this device without tripping over power
2212 * of two sector size assumptions
2213 */
2214 sector_size = 512;
2215 }
2216 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2217
2218 {
2219 char cap_str_2[10], cap_str_10[10];
2220 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2221
2222 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2223 sizeof(cap_str_2));
2224 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2225 sizeof(cap_str_10));
2226
2227 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2228 sd_printk(KERN_NOTICE, sdkp,
2229 "%llu %d-byte logical blocks: (%s/%s)\n",
2230 (unsigned long long)sdkp->capacity,
2231 sector_size, cap_str_10, cap_str_2);
2232
2233 if (sdkp->physical_block_size != sector_size)
2234 sd_printk(KERN_NOTICE, sdkp,
2235 "%u-byte physical blocks\n",
2236 sdkp->physical_block_size);
2237 }
2238 }
2239
2240 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2241
2242 /* Rescale capacity to 512-byte units */
2243 if (sector_size == 4096)
2244 sdkp->capacity <<= 3;
2245 else if (sector_size == 2048)
2246 sdkp->capacity <<= 2;
2247 else if (sector_size == 1024)
2248 sdkp->capacity <<= 1;
2249 else if (sector_size == 256)
2250 sdkp->capacity >>= 1;
2251
2252 blk_queue_physical_block_size(sdp->request_queue,
2253 sdkp->physical_block_size);
2254 sdkp->device->sector_size = sector_size;
2255 }
2256
2257 /* called with buffer of length 512 */
2258 static inline int
2259 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2260 unsigned char *buffer, int len, struct scsi_mode_data *data,
2261 struct scsi_sense_hdr *sshdr)
2262 {
2263 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2264 SD_TIMEOUT, SD_MAX_RETRIES, data,
2265 sshdr);
2266 }
2267
2268 /*
2269 * read write protect setting, if possible - called only in sd_revalidate_disk()
2270 * called with buffer of length SD_BUF_SIZE
2271 */
2272 static void
2273 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2274 {
2275 int res;
2276 struct scsi_device *sdp = sdkp->device;
2277 struct scsi_mode_data data;
2278 int old_wp = sdkp->write_prot;
2279
2280 set_disk_ro(sdkp->disk, 0);
2281 if (sdp->skip_ms_page_3f) {
2282 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2283 return;
2284 }
2285
2286 if (sdp->use_192_bytes_for_3f) {
2287 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2288 } else {
2289 /*
2290 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2291 * We have to start carefully: some devices hang if we ask
2292 * for more than is available.
2293 */
2294 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2295
2296 /*
2297 * Second attempt: ask for page 0 When only page 0 is
2298 * implemented, a request for page 3F may return Sense Key
2299 * 5: Illegal Request, Sense Code 24: Invalid field in
2300 * CDB.
2301 */
2302 if (!scsi_status_is_good(res))
2303 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2304
2305 /*
2306 * Third attempt: ask 255 bytes, as we did earlier.
2307 */
2308 if (!scsi_status_is_good(res))
2309 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2310 &data, NULL);
2311 }
2312
2313 if (!scsi_status_is_good(res)) {
2314 sd_first_printk(KERN_WARNING, sdkp,
2315 "Test WP failed, assume Write Enabled\n");
2316 } else {
2317 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2318 set_disk_ro(sdkp->disk, sdkp->write_prot);
2319 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2320 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2321 sdkp->write_prot ? "on" : "off");
2322 sd_printk(KERN_DEBUG, sdkp,
2323 "Mode Sense: %02x %02x %02x %02x\n",
2324 buffer[0], buffer[1], buffer[2], buffer[3]);
2325 }
2326 }
2327 }
2328
2329 /*
2330 * sd_read_cache_type - called only from sd_revalidate_disk()
2331 * called with buffer of length SD_BUF_SIZE
2332 */
2333 static void
2334 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2335 {
2336 int len = 0, res;
2337 struct scsi_device *sdp = sdkp->device;
2338
2339 int dbd;
2340 int modepage;
2341 int first_len;
2342 struct scsi_mode_data data;
2343 struct scsi_sense_hdr sshdr;
2344 int old_wce = sdkp->WCE;
2345 int old_rcd = sdkp->RCD;
2346 int old_dpofua = sdkp->DPOFUA;
2347
2348
2349 if (sdkp->cache_override)
2350 return;
2351
2352 first_len = 4;
2353 if (sdp->skip_ms_page_8) {
2354 if (sdp->type == TYPE_RBC)
2355 goto defaults;
2356 else {
2357 if (sdp->skip_ms_page_3f)
2358 goto defaults;
2359 modepage = 0x3F;
2360 if (sdp->use_192_bytes_for_3f)
2361 first_len = 192;
2362 dbd = 0;
2363 }
2364 } else if (sdp->type == TYPE_RBC) {
2365 modepage = 6;
2366 dbd = 8;
2367 } else {
2368 modepage = 8;
2369 dbd = 0;
2370 }
2371
2372 /* cautiously ask */
2373 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2374 &data, &sshdr);
2375
2376 if (!scsi_status_is_good(res))
2377 goto bad_sense;
2378
2379 if (!data.header_length) {
2380 modepage = 6;
2381 first_len = 0;
2382 sd_first_printk(KERN_ERR, sdkp,
2383 "Missing header in MODE_SENSE response\n");
2384 }
2385
2386 /* that went OK, now ask for the proper length */
2387 len = data.length;
2388
2389 /*
2390 * We're only interested in the first three bytes, actually.
2391 * But the data cache page is defined for the first 20.
2392 */
2393 if (len < 3)
2394 goto bad_sense;
2395 else if (len > SD_BUF_SIZE) {
2396 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2397 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2398 len = SD_BUF_SIZE;
2399 }
2400 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2401 len = 192;
2402
2403 /* Get the data */
2404 if (len > first_len)
2405 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2406 &data, &sshdr);
2407
2408 if (scsi_status_is_good(res)) {
2409 int offset = data.header_length + data.block_descriptor_length;
2410
2411 while (offset < len) {
2412 u8 page_code = buffer[offset] & 0x3F;
2413 u8 spf = buffer[offset] & 0x40;
2414
2415 if (page_code == 8 || page_code == 6) {
2416 /* We're interested only in the first 3 bytes.
2417 */
2418 if (len - offset <= 2) {
2419 sd_first_printk(KERN_ERR, sdkp,
2420 "Incomplete mode parameter "
2421 "data\n");
2422 goto defaults;
2423 } else {
2424 modepage = page_code;
2425 goto Page_found;
2426 }
2427 } else {
2428 /* Go to the next page */
2429 if (spf && len - offset > 3)
2430 offset += 4 + (buffer[offset+2] << 8) +
2431 buffer[offset+3];
2432 else if (!spf && len - offset > 1)
2433 offset += 2 + buffer[offset+1];
2434 else {
2435 sd_first_printk(KERN_ERR, sdkp,
2436 "Incomplete mode "
2437 "parameter data\n");
2438 goto defaults;
2439 }
2440 }
2441 }
2442
2443 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2444 goto defaults;
2445
2446 Page_found:
2447 if (modepage == 8) {
2448 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2449 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2450 } else {
2451 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2452 sdkp->RCD = 0;
2453 }
2454
2455 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2456 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2457 sd_first_printk(KERN_NOTICE, sdkp,
2458 "Uses READ/WRITE(6), disabling FUA\n");
2459 sdkp->DPOFUA = 0;
2460 }
2461
2462 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2463 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2464 sd_printk(KERN_NOTICE, sdkp,
2465 "Write cache: %s, read cache: %s, %s\n",
2466 sdkp->WCE ? "enabled" : "disabled",
2467 sdkp->RCD ? "disabled" : "enabled",
2468 sdkp->DPOFUA ? "supports DPO and FUA"
2469 : "doesn't support DPO or FUA");
2470
2471 return;
2472 }
2473
2474 bad_sense:
2475 if (scsi_sense_valid(&sshdr) &&
2476 sshdr.sense_key == ILLEGAL_REQUEST &&
2477 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2478 /* Invalid field in CDB */
2479 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2480 else
2481 sd_first_printk(KERN_ERR, sdkp,
2482 "Asking for cache data failed\n");
2483
2484 defaults:
2485 if (sdp->wce_default_on) {
2486 sd_first_printk(KERN_NOTICE, sdkp,
2487 "Assuming drive cache: write back\n");
2488 sdkp->WCE = 1;
2489 } else {
2490 sd_first_printk(KERN_ERR, sdkp,
2491 "Assuming drive cache: write through\n");
2492 sdkp->WCE = 0;
2493 }
2494 sdkp->RCD = 0;
2495 sdkp->DPOFUA = 0;
2496 }
2497
2498 /*
2499 * The ATO bit indicates whether the DIF application tag is available
2500 * for use by the operating system.
2501 */
2502 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2503 {
2504 int res, offset;
2505 struct scsi_device *sdp = sdkp->device;
2506 struct scsi_mode_data data;
2507 struct scsi_sense_hdr sshdr;
2508
2509 if (sdp->type != TYPE_DISK)
2510 return;
2511
2512 if (sdkp->protection_type == 0)
2513 return;
2514
2515 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2516 SD_MAX_RETRIES, &data, &sshdr);
2517
2518 if (!scsi_status_is_good(res) || !data.header_length ||
2519 data.length < 6) {
2520 sd_first_printk(KERN_WARNING, sdkp,
2521 "getting Control mode page failed, assume no ATO\n");
2522
2523 if (scsi_sense_valid(&sshdr))
2524 sd_print_sense_hdr(sdkp, &sshdr);
2525
2526 return;
2527 }
2528
2529 offset = data.header_length + data.block_descriptor_length;
2530
2531 if ((buffer[offset] & 0x3f) != 0x0a) {
2532 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2533 return;
2534 }
2535
2536 if ((buffer[offset + 5] & 0x80) == 0)
2537 return;
2538
2539 sdkp->ATO = 1;
2540
2541 return;
2542 }
2543
2544 /**
2545 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2546 * @disk: disk to query
2547 */
2548 static void sd_read_block_limits(struct scsi_disk *sdkp)
2549 {
2550 unsigned int sector_sz = sdkp->device->sector_size;
2551 const int vpd_len = 64;
2552 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2553
2554 if (!buffer ||
2555 /* Block Limits VPD */
2556 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2557 goto out;
2558
2559 blk_queue_io_min(sdkp->disk->queue,
2560 get_unaligned_be16(&buffer[6]) * sector_sz);
2561 blk_queue_io_opt(sdkp->disk->queue,
2562 get_unaligned_be32(&buffer[12]) * sector_sz);
2563
2564 if (buffer[3] == 0x3c) {
2565 unsigned int lba_count, desc_count;
2566
2567 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2568
2569 if (!sdkp->lbpme)
2570 goto out;
2571
2572 lba_count = get_unaligned_be32(&buffer[20]);
2573 desc_count = get_unaligned_be32(&buffer[24]);
2574
2575 if (lba_count && desc_count)
2576 sdkp->max_unmap_blocks = lba_count;
2577
2578 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2579
2580 if (buffer[32] & 0x80)
2581 sdkp->unmap_alignment =
2582 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2583
2584 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2585
2586 if (sdkp->max_unmap_blocks)
2587 sd_config_discard(sdkp, SD_LBP_UNMAP);
2588 else
2589 sd_config_discard(sdkp, SD_LBP_WS16);
2590
2591 } else { /* LBP VPD page tells us what to use */
2592
2593 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2594 sd_config_discard(sdkp, SD_LBP_UNMAP);
2595 else if (sdkp->lbpws)
2596 sd_config_discard(sdkp, SD_LBP_WS16);
2597 else if (sdkp->lbpws10)
2598 sd_config_discard(sdkp, SD_LBP_WS10);
2599 else
2600 sd_config_discard(sdkp, SD_LBP_DISABLE);
2601 }
2602 }
2603
2604 out:
2605 kfree(buffer);
2606 }
2607
2608 /**
2609 * sd_read_block_characteristics - Query block dev. characteristics
2610 * @disk: disk to query
2611 */
2612 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2613 {
2614 unsigned char *buffer;
2615 u16 rot;
2616 const int vpd_len = 64;
2617
2618 buffer = kmalloc(vpd_len, GFP_KERNEL);
2619
2620 if (!buffer ||
2621 /* Block Device Characteristics VPD */
2622 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2623 goto out;
2624
2625 rot = get_unaligned_be16(&buffer[4]);
2626
2627 if (rot == 1)
2628 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2629
2630 out:
2631 kfree(buffer);
2632 }
2633
2634 /**
2635 * sd_read_block_provisioning - Query provisioning VPD page
2636 * @disk: disk to query
2637 */
2638 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2639 {
2640 unsigned char *buffer;
2641 const int vpd_len = 8;
2642
2643 if (sdkp->lbpme == 0)
2644 return;
2645
2646 buffer = kmalloc(vpd_len, GFP_KERNEL);
2647
2648 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2649 goto out;
2650
2651 sdkp->lbpvpd = 1;
2652 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2653 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2654 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2655
2656 out:
2657 kfree(buffer);
2658 }
2659
2660 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2661 {
2662 struct scsi_device *sdev = sdkp->device;
2663
2664 if (sdev->host->no_write_same) {
2665 sdev->no_write_same = 1;
2666
2667 return;
2668 }
2669
2670 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2671 /* too large values might cause issues with arcmsr */
2672 int vpd_buf_len = 64;
2673
2674 sdev->no_report_opcodes = 1;
2675
2676 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2677 * CODES is unsupported and the device has an ATA
2678 * Information VPD page (SAT).
2679 */
2680 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2681 sdev->no_write_same = 1;
2682 }
2683
2684 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2685 sdkp->ws16 = 1;
2686
2687 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2688 sdkp->ws10 = 1;
2689 }
2690
2691 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2692 {
2693 /*
2694 * Although VPD inquiries can go to SCSI-2 type devices,
2695 * some USB ones crash on receiving them, and the pages
2696 * we currently ask for are for SPC-3 and beyond
2697 */
2698 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2699 return 1;
2700 return 0;
2701 }
2702
2703 /**
2704 * sd_revalidate_disk - called the first time a new disk is seen,
2705 * performs disk spin up, read_capacity, etc.
2706 * @disk: struct gendisk we care about
2707 **/
2708 static int sd_revalidate_disk(struct gendisk *disk)
2709 {
2710 struct scsi_disk *sdkp = scsi_disk(disk);
2711 struct scsi_device *sdp = sdkp->device;
2712 unsigned char *buffer;
2713 unsigned flush = 0;
2714
2715 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2716 "sd_revalidate_disk\n"));
2717
2718 /*
2719 * If the device is offline, don't try and read capacity or any
2720 * of the other niceties.
2721 */
2722 if (!scsi_device_online(sdp))
2723 goto out;
2724
2725 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2726 if (!buffer) {
2727 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2728 "allocation failure.\n");
2729 goto out;
2730 }
2731
2732 sd_spinup_disk(sdkp);
2733
2734 /*
2735 * Without media there is no reason to ask; moreover, some devices
2736 * react badly if we do.
2737 */
2738 if (sdkp->media_present) {
2739 sd_read_capacity(sdkp, buffer);
2740
2741 if (sd_try_extended_inquiry(sdp)) {
2742 sd_read_block_provisioning(sdkp);
2743 sd_read_block_limits(sdkp);
2744 sd_read_block_characteristics(sdkp);
2745 }
2746
2747 sd_read_write_protect_flag(sdkp, buffer);
2748 sd_read_cache_type(sdkp, buffer);
2749 sd_read_app_tag_own(sdkp, buffer);
2750 sd_read_write_same(sdkp, buffer);
2751 }
2752
2753 sdkp->first_scan = 0;
2754
2755 /*
2756 * We now have all cache related info, determine how we deal
2757 * with flush requests.
2758 */
2759 if (sdkp->WCE) {
2760 flush |= REQ_FLUSH;
2761 if (sdkp->DPOFUA)
2762 flush |= REQ_FUA;
2763 }
2764
2765 blk_queue_flush(sdkp->disk->queue, flush);
2766
2767 set_capacity(disk, sdkp->capacity);
2768 sd_config_write_same(sdkp);
2769 kfree(buffer);
2770
2771 out:
2772 return 0;
2773 }
2774
2775 /**
2776 * sd_unlock_native_capacity - unlock native capacity
2777 * @disk: struct gendisk to set capacity for
2778 *
2779 * Block layer calls this function if it detects that partitions
2780 * on @disk reach beyond the end of the device. If the SCSI host
2781 * implements ->unlock_native_capacity() method, it's invoked to
2782 * give it a chance to adjust the device capacity.
2783 *
2784 * CONTEXT:
2785 * Defined by block layer. Might sleep.
2786 */
2787 static void sd_unlock_native_capacity(struct gendisk *disk)
2788 {
2789 struct scsi_device *sdev = scsi_disk(disk)->device;
2790
2791 if (sdev->host->hostt->unlock_native_capacity)
2792 sdev->host->hostt->unlock_native_capacity(sdev);
2793 }
2794
2795 /**
2796 * sd_format_disk_name - format disk name
2797 * @prefix: name prefix - ie. "sd" for SCSI disks
2798 * @index: index of the disk to format name for
2799 * @buf: output buffer
2800 * @buflen: length of the output buffer
2801 *
2802 * SCSI disk names starts at sda. The 26th device is sdz and the
2803 * 27th is sdaa. The last one for two lettered suffix is sdzz
2804 * which is followed by sdaaa.
2805 *
2806 * This is basically 26 base counting with one extra 'nil' entry
2807 * at the beginning from the second digit on and can be
2808 * determined using similar method as 26 base conversion with the
2809 * index shifted -1 after each digit is computed.
2810 *
2811 * CONTEXT:
2812 * Don't care.
2813 *
2814 * RETURNS:
2815 * 0 on success, -errno on failure.
2816 */
2817 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2818 {
2819 const int base = 'z' - 'a' + 1;
2820 char *begin = buf + strlen(prefix);
2821 char *end = buf + buflen;
2822 char *p;
2823 int unit;
2824
2825 p = end - 1;
2826 *p = '\0';
2827 unit = base;
2828 do {
2829 if (p == begin)
2830 return -EINVAL;
2831 *--p = 'a' + (index % unit);
2832 index = (index / unit) - 1;
2833 } while (index >= 0);
2834
2835 memmove(begin, p, end - p);
2836 memcpy(buf, prefix, strlen(prefix));
2837
2838 return 0;
2839 }
2840
2841 /*
2842 * The asynchronous part of sd_probe
2843 */
2844 static void sd_probe_async(void *data, async_cookie_t cookie)
2845 {
2846 struct scsi_disk *sdkp = data;
2847 struct scsi_device *sdp;
2848 struct gendisk *gd;
2849 u32 index;
2850 struct device *dev;
2851
2852 sdp = sdkp->device;
2853 gd = sdkp->disk;
2854 index = sdkp->index;
2855 dev = &sdp->sdev_gendev;
2856
2857 gd->major = sd_major((index & 0xf0) >> 4);
2858 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2859 gd->minors = SD_MINORS;
2860
2861 gd->fops = &sd_fops;
2862 gd->private_data = &sdkp->driver;
2863 gd->queue = sdkp->device->request_queue;
2864
2865 /* defaults, until the device tells us otherwise */
2866 sdp->sector_size = 512;
2867 sdkp->capacity = 0;
2868 sdkp->media_present = 1;
2869 sdkp->write_prot = 0;
2870 sdkp->cache_override = 0;
2871 sdkp->WCE = 0;
2872 sdkp->RCD = 0;
2873 sdkp->ATO = 0;
2874 sdkp->first_scan = 1;
2875 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2876
2877 sd_revalidate_disk(gd);
2878
2879 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2880 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2881
2882 gd->driverfs_dev = &sdp->sdev_gendev;
2883 gd->flags = GENHD_FL_EXT_DEVT;
2884 if (sdp->removable) {
2885 gd->flags |= GENHD_FL_REMOVABLE;
2886 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2887 }
2888
2889 blk_pm_runtime_init(sdp->request_queue, dev);
2890 add_disk(gd);
2891 if (sdkp->capacity)
2892 sd_dif_config_host(sdkp);
2893
2894 sd_revalidate_disk(gd);
2895
2896 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2897 sdp->removable ? "removable " : "");
2898 scsi_autopm_put_device(sdp);
2899 put_device(&sdkp->dev);
2900 }
2901
2902 /**
2903 * sd_probe - called during driver initialization and whenever a
2904 * new scsi device is attached to the system. It is called once
2905 * for each scsi device (not just disks) present.
2906 * @dev: pointer to device object
2907 *
2908 * Returns 0 if successful (or not interested in this scsi device
2909 * (e.g. scanner)); 1 when there is an error.
2910 *
2911 * Note: this function is invoked from the scsi mid-level.
2912 * This function sets up the mapping between a given
2913 * <host,channel,id,lun> (found in sdp) and new device name
2914 * (e.g. /dev/sda). More precisely it is the block device major
2915 * and minor number that is chosen here.
2916 *
2917 * Assume sd_probe is not re-entrant (for time being)
2918 * Also think about sd_probe() and sd_remove() running coincidentally.
2919 **/
2920 static int sd_probe(struct device *dev)
2921 {
2922 struct scsi_device *sdp = to_scsi_device(dev);
2923 struct scsi_disk *sdkp;
2924 struct gendisk *gd;
2925 int index;
2926 int error;
2927
2928 error = -ENODEV;
2929 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2930 goto out;
2931
2932 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2933 "sd_probe\n"));
2934
2935 error = -ENOMEM;
2936 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2937 if (!sdkp)
2938 goto out;
2939
2940 gd = alloc_disk(SD_MINORS);
2941 if (!gd)
2942 goto out_free;
2943
2944 do {
2945 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2946 goto out_put;
2947
2948 spin_lock(&sd_index_lock);
2949 error = ida_get_new(&sd_index_ida, &index);
2950 spin_unlock(&sd_index_lock);
2951 } while (error == -EAGAIN);
2952
2953 if (error) {
2954 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2955 goto out_put;
2956 }
2957
2958 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2959 if (error) {
2960 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2961 goto out_free_index;
2962 }
2963
2964 sdkp->device = sdp;
2965 sdkp->driver = &sd_template;
2966 sdkp->disk = gd;
2967 sdkp->index = index;
2968 atomic_set(&sdkp->openers, 0);
2969 atomic_set(&sdkp->device->ioerr_cnt, 0);
2970
2971 if (!sdp->request_queue->rq_timeout) {
2972 if (sdp->type != TYPE_MOD)
2973 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2974 else
2975 blk_queue_rq_timeout(sdp->request_queue,
2976 SD_MOD_TIMEOUT);
2977 }
2978
2979 device_initialize(&sdkp->dev);
2980 sdkp->dev.parent = dev;
2981 sdkp->dev.class = &sd_disk_class;
2982 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
2983
2984 if (device_add(&sdkp->dev))
2985 goto out_free_index;
2986
2987 get_device(dev);
2988 dev_set_drvdata(dev, sdkp);
2989
2990 get_device(&sdkp->dev); /* prevent release before async_schedule */
2991 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2992
2993 return 0;
2994
2995 out_free_index:
2996 spin_lock(&sd_index_lock);
2997 ida_remove(&sd_index_ida, index);
2998 spin_unlock(&sd_index_lock);
2999 out_put:
3000 put_disk(gd);
3001 out_free:
3002 kfree(sdkp);
3003 out:
3004 return error;
3005 }
3006
3007 /**
3008 * sd_remove - called whenever a scsi disk (previously recognized by
3009 * sd_probe) is detached from the system. It is called (potentially
3010 * multiple times) during sd module unload.
3011 * @sdp: pointer to mid level scsi device object
3012 *
3013 * Note: this function is invoked from the scsi mid-level.
3014 * This function potentially frees up a device name (e.g. /dev/sdc)
3015 * that could be re-used by a subsequent sd_probe().
3016 * This function is not called when the built-in sd driver is "exit-ed".
3017 **/
3018 static int sd_remove(struct device *dev)
3019 {
3020 struct scsi_disk *sdkp;
3021 dev_t devt;
3022
3023 sdkp = dev_get_drvdata(dev);
3024 devt = disk_devt(sdkp->disk);
3025 scsi_autopm_get_device(sdkp->device);
3026
3027 async_synchronize_full_domain(&scsi_sd_pm_domain);
3028 async_synchronize_full_domain(&scsi_sd_probe_domain);
3029 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
3030 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
3031 device_del(&sdkp->dev);
3032 del_gendisk(sdkp->disk);
3033 sd_shutdown(dev);
3034
3035 blk_register_region(devt, SD_MINORS, NULL,
3036 sd_default_probe, NULL, NULL);
3037
3038 mutex_lock(&sd_ref_mutex);
3039 dev_set_drvdata(dev, NULL);
3040 put_device(&sdkp->dev);
3041 mutex_unlock(&sd_ref_mutex);
3042
3043 return 0;
3044 }
3045
3046 /**
3047 * scsi_disk_release - Called to free the scsi_disk structure
3048 * @dev: pointer to embedded class device
3049 *
3050 * sd_ref_mutex must be held entering this routine. Because it is
3051 * called on last put, you should always use the scsi_disk_get()
3052 * scsi_disk_put() helpers which manipulate the semaphore directly
3053 * and never do a direct put_device.
3054 **/
3055 static void scsi_disk_release(struct device *dev)
3056 {
3057 struct scsi_disk *sdkp = to_scsi_disk(dev);
3058 struct gendisk *disk = sdkp->disk;
3059
3060 spin_lock(&sd_index_lock);
3061 ida_remove(&sd_index_ida, sdkp->index);
3062 spin_unlock(&sd_index_lock);
3063
3064 disk->private_data = NULL;
3065 put_disk(disk);
3066 put_device(&sdkp->device->sdev_gendev);
3067
3068 kfree(sdkp);
3069 }
3070
3071 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3072 {
3073 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3074 struct scsi_sense_hdr sshdr;
3075 struct scsi_device *sdp = sdkp->device;
3076 int res;
3077
3078 if (start)
3079 cmd[4] |= 1; /* START */
3080
3081 if (sdp->start_stop_pwr_cond)
3082 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3083
3084 if (!scsi_device_online(sdp))
3085 return -ENODEV;
3086
3087 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3088 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3089 if (res) {
3090 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3091 sd_print_result(sdkp, res);
3092 if (driver_byte(res) & DRIVER_SENSE)
3093 sd_print_sense_hdr(sdkp, &sshdr);
3094 if (scsi_sense_valid(&sshdr) &&
3095 /* 0x3a is medium not present */
3096 sshdr.asc == 0x3a)
3097 res = 0;
3098 }
3099
3100 /* SCSI error codes must not go to the generic layer */
3101 if (res)
3102 return -EIO;
3103
3104 return 0;
3105 }
3106
3107 /*
3108 * Send a SYNCHRONIZE CACHE instruction down to the device through
3109 * the normal SCSI command structure. Wait for the command to
3110 * complete.
3111 */
3112 static void sd_shutdown(struct device *dev)
3113 {
3114 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3115
3116 if (!sdkp)
3117 return; /* this can happen */
3118
3119 if (pm_runtime_suspended(dev))
3120 goto exit;
3121
3122 if (sdkp->WCE && sdkp->media_present) {
3123 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3124 sd_sync_cache(sdkp);
3125 }
3126
3127 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3128 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3129 sd_start_stop_device(sdkp, 0);
3130 }
3131
3132 exit:
3133 scsi_disk_put(sdkp);
3134 }
3135
3136 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3137 {
3138 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3139 int ret = 0;
3140
3141 if (!sdkp)
3142 return 0; /* this can happen */
3143
3144 if (sdkp->WCE && sdkp->media_present) {
3145 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3146 ret = sd_sync_cache(sdkp);
3147 if (ret) {
3148 /* ignore OFFLINE device */
3149 if (ret == -ENODEV)
3150 ret = 0;
3151 goto done;
3152 }
3153 }
3154
3155 if (sdkp->device->manage_start_stop) {
3156 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3157 /* an error is not worth aborting a system sleep */
3158 ret = sd_start_stop_device(sdkp, 0);
3159 if (ignore_stop_errors)
3160 ret = 0;
3161 }
3162
3163 done:
3164 scsi_disk_put(sdkp);
3165 return ret;
3166 }
3167
3168 static int sd_suspend_system(struct device *dev)
3169 {
3170 return sd_suspend_common(dev, true);
3171 }
3172
3173 static int sd_suspend_runtime(struct device *dev)
3174 {
3175 return sd_suspend_common(dev, false);
3176 }
3177
3178 static int sd_resume(struct device *dev)
3179 {
3180 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3181 int ret = 0;
3182
3183 if (!sdkp->device->manage_start_stop)
3184 goto done;
3185
3186 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3187 ret = sd_start_stop_device(sdkp, 1);
3188
3189 done:
3190 scsi_disk_put(sdkp);
3191 return ret;
3192 }
3193
3194 /**
3195 * init_sd - entry point for this driver (both when built in or when
3196 * a module).
3197 *
3198 * Note: this function registers this driver with the scsi mid-level.
3199 **/
3200 static int __init init_sd(void)
3201 {
3202 int majors = 0, i, err;
3203
3204 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3205
3206 for (i = 0; i < SD_MAJORS; i++) {
3207 if (register_blkdev(sd_major(i), "sd") != 0)
3208 continue;
3209 majors++;
3210 blk_register_region(sd_major(i), SD_MINORS, NULL,
3211 sd_default_probe, NULL, NULL);
3212 }
3213
3214 if (!majors)
3215 return -ENODEV;
3216
3217 err = class_register(&sd_disk_class);
3218 if (err)
3219 goto err_out;
3220
3221 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3222 0, 0, NULL);
3223 if (!sd_cdb_cache) {
3224 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3225 goto err_out_class;
3226 }
3227
3228 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3229 if (!sd_cdb_pool) {
3230 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3231 goto err_out_cache;
3232 }
3233
3234 err = scsi_register_driver(&sd_template.gendrv);
3235 if (err)
3236 goto err_out_driver;
3237
3238 return 0;
3239
3240 err_out_driver:
3241 mempool_destroy(sd_cdb_pool);
3242
3243 err_out_cache:
3244 kmem_cache_destroy(sd_cdb_cache);
3245
3246 err_out_class:
3247 class_unregister(&sd_disk_class);
3248 err_out:
3249 for (i = 0; i < SD_MAJORS; i++)
3250 unregister_blkdev(sd_major(i), "sd");
3251 return err;
3252 }
3253
3254 /**
3255 * exit_sd - exit point for this driver (when it is a module).
3256 *
3257 * Note: this function unregisters this driver from the scsi mid-level.
3258 **/
3259 static void __exit exit_sd(void)
3260 {
3261 int i;
3262
3263 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3264
3265 scsi_unregister_driver(&sd_template.gendrv);
3266 mempool_destroy(sd_cdb_pool);
3267 kmem_cache_destroy(sd_cdb_cache);
3268
3269 class_unregister(&sd_disk_class);
3270
3271 for (i = 0; i < SD_MAJORS; i++) {
3272 blk_unregister_region(sd_major(i), SD_MINORS);
3273 unregister_blkdev(sd_major(i), "sd");
3274 }
3275 }
3276
3277 module_init(init_sd);
3278 module_exit(exit_sd);
3279
3280 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3281 struct scsi_sense_hdr *sshdr)
3282 {
3283 sd_printk(KERN_INFO, sdkp, " ");
3284 scsi_show_sense_hdr(sshdr);
3285 sd_printk(KERN_INFO, sdkp, " ");
3286 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3287 }
3288
3289 static void sd_print_result(struct scsi_disk *sdkp, int result)
3290 {
3291 sd_printk(KERN_INFO, sdkp, " ");
3292 scsi_show_result(result);
3293 }
3294