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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / scsi / sd.c
blobf8b6bf56c48e20c93b9322d87fe26653205c2793
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 <linux/pr.h>
55 #include <linux/t10-pi.h>
56 #include <asm/uaccess.h>
57 #include <asm/unaligned.h>
58
59 #include <scsi/scsi.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_dbg.h>
62 #include <scsi/scsi_device.h>
63 #include <scsi/scsi_driver.h>
64 #include <scsi/scsi_eh.h>
65 #include <scsi/scsi_host.h>
66 #include <scsi/scsi_ioctl.h>
67 #include <scsi/scsicam.h>
68
69 #include "sd.h"
70 #include "scsi_priv.h"
71 #include "scsi_logging.h"
72
73 MODULE_AUTHOR("Eric Youngdale");
74 MODULE_DESCRIPTION("SCSI disk (sd) driver");
75 MODULE_LICENSE("GPL");
76
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
95 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
96
97 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
98 #define SD_MINORS 16
99 #else
100 #define SD_MINORS 0
101 #endif
102
103 static void sd_config_discard(struct scsi_disk *, unsigned int);
104 static void sd_config_write_same(struct scsi_disk *);
105 static int sd_revalidate_disk(struct gendisk *);
106 static void sd_unlock_native_capacity(struct gendisk *disk);
107 static int sd_probe(struct device *);
108 static int sd_remove(struct device *);
109 static void sd_shutdown(struct device *);
110 static int sd_suspend_system(struct device *);
111 static int sd_suspend_runtime(struct device *);
112 static int sd_resume(struct device *);
113 static void sd_rescan(struct device *);
114 static int sd_init_command(struct scsi_cmnd *SCpnt);
115 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
116 static int sd_done(struct scsi_cmnd *);
117 static int sd_eh_action(struct scsi_cmnd *, int);
118 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
119 static void scsi_disk_release(struct device *cdev);
120 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
121 static void sd_print_result(const struct scsi_disk *, const char *, int);
122
123 static DEFINE_SPINLOCK(sd_index_lock);
124 static DEFINE_IDA(sd_index_ida);
125
126 /* This semaphore is used to mediate the 0->1 reference get in the
127 * face of object destruction (i.e. we can't allow a get on an
128 * object after last put) */
129 static DEFINE_MUTEX(sd_ref_mutex);
130
131 static struct kmem_cache *sd_cdb_cache;
132 static mempool_t *sd_cdb_pool;
133
134 static const char *sd_cache_types[] = {
135 "write through", "none", "write back",
136 "write back, no read (daft)"
137 };
138
139 static void sd_set_flush_flag(struct scsi_disk *sdkp)
140 {
141 bool wc = false, fua = false;
142
143 if (sdkp->WCE) {
144 wc = true;
145 if (sdkp->DPOFUA)
146 fua = true;
147 }
148
149 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
150 }
151
152 static ssize_t
153 cache_type_store(struct device *dev, struct device_attribute *attr,
154 const char *buf, size_t count)
155 {
156 int i, ct = -1, rcd, wce, sp;
157 struct scsi_disk *sdkp = to_scsi_disk(dev);
158 struct scsi_device *sdp = sdkp->device;
159 char buffer[64];
160 char *buffer_data;
161 struct scsi_mode_data data;
162 struct scsi_sense_hdr sshdr;
163 static const char temp[] = "temporary ";
164 int len;
165
166 if (sdp->type != TYPE_DISK)
167 /* no cache control on RBC devices; theoretically they
168 * can do it, but there's probably so many exceptions
169 * it's not worth the risk */
170 return -EINVAL;
171
172 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
173 buf += sizeof(temp) - 1;
174 sdkp->cache_override = 1;
175 } else {
176 sdkp->cache_override = 0;
177 }
178
179 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
180 len = strlen(sd_cache_types[i]);
181 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
182 buf[len] == '\n') {
183 ct = i;
184 break;
185 }
186 }
187 if (ct < 0)
188 return -EINVAL;
189 rcd = ct & 0x01 ? 1 : 0;
190 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
191
192 if (sdkp->cache_override) {
193 sdkp->WCE = wce;
194 sdkp->RCD = rcd;
195 sd_set_flush_flag(sdkp);
196 return count;
197 }
198
199 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
200 SD_MAX_RETRIES, &data, NULL))
201 return -EINVAL;
202 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
203 data.block_descriptor_length);
204 buffer_data = buffer + data.header_length +
205 data.block_descriptor_length;
206 buffer_data[2] &= ~0x05;
207 buffer_data[2] |= wce << 2 | rcd;
208 sp = buffer_data[0] & 0x80 ? 1 : 0;
209 buffer_data[0] &= ~0x80;
210
211 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
212 SD_MAX_RETRIES, &data, &sshdr)) {
213 if (scsi_sense_valid(&sshdr))
214 sd_print_sense_hdr(sdkp, &sshdr);
215 return -EINVAL;
216 }
217 revalidate_disk(sdkp->disk);
218 return count;
219 }
220
221 static ssize_t
222 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
223 char *buf)
224 {
225 struct scsi_disk *sdkp = to_scsi_disk(dev);
226 struct scsi_device *sdp = sdkp->device;
227
228 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
229 }
230
231 static ssize_t
232 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
233 const char *buf, size_t count)
234 {
235 struct scsi_disk *sdkp = to_scsi_disk(dev);
236 struct scsi_device *sdp = sdkp->device;
237 bool v;
238
239 if (!capable(CAP_SYS_ADMIN))
240 return -EACCES;
241
242 if (kstrtobool(buf, &v))
243 return -EINVAL;
244
245 sdp->manage_start_stop = v;
246
247 return count;
248 }
249 static DEVICE_ATTR_RW(manage_start_stop);
250
251 static ssize_t
252 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
253 {
254 struct scsi_disk *sdkp = to_scsi_disk(dev);
255
256 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
257 }
258
259 static ssize_t
260 allow_restart_store(struct device *dev, struct device_attribute *attr,
261 const char *buf, size_t count)
262 {
263 bool v;
264 struct scsi_disk *sdkp = to_scsi_disk(dev);
265 struct scsi_device *sdp = sdkp->device;
266
267 if (!capable(CAP_SYS_ADMIN))
268 return -EACCES;
269
270 if (sdp->type != TYPE_DISK)
271 return -EINVAL;
272
273 if (kstrtobool(buf, &v))
274 return -EINVAL;
275
276 sdp->allow_restart = v;
277
278 return count;
279 }
280 static DEVICE_ATTR_RW(allow_restart);
281
282 static ssize_t
283 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
284 {
285 struct scsi_disk *sdkp = to_scsi_disk(dev);
286 int ct = sdkp->RCD + 2*sdkp->WCE;
287
288 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
289 }
290 static DEVICE_ATTR_RW(cache_type);
291
292 static ssize_t
293 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
294 {
295 struct scsi_disk *sdkp = to_scsi_disk(dev);
296
297 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
298 }
299 static DEVICE_ATTR_RO(FUA);
300
301 static ssize_t
302 protection_type_show(struct device *dev, struct device_attribute *attr,
303 char *buf)
304 {
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
306
307 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
308 }
309
310 static ssize_t
311 protection_type_store(struct device *dev, struct device_attribute *attr,
312 const char *buf, size_t count)
313 {
314 struct scsi_disk *sdkp = to_scsi_disk(dev);
315 unsigned int val;
316 int err;
317
318 if (!capable(CAP_SYS_ADMIN))
319 return -EACCES;
320
321 err = kstrtouint(buf, 10, &val);
322
323 if (err)
324 return err;
325
326 if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
327 sdkp->protection_type = val;
328
329 return count;
330 }
331 static DEVICE_ATTR_RW(protection_type);
332
333 static ssize_t
334 protection_mode_show(struct device *dev, struct device_attribute *attr,
335 char *buf)
336 {
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
338 struct scsi_device *sdp = sdkp->device;
339 unsigned int dif, dix;
340
341 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
342 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
343
344 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
345 dif = 0;
346 dix = 1;
347 }
348
349 if (!dif && !dix)
350 return snprintf(buf, 20, "none\n");
351
352 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
353 }
354 static DEVICE_ATTR_RO(protection_mode);
355
356 static ssize_t
357 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
358 {
359 struct scsi_disk *sdkp = to_scsi_disk(dev);
360
361 return snprintf(buf, 20, "%u\n", sdkp->ATO);
362 }
363 static DEVICE_ATTR_RO(app_tag_own);
364
365 static ssize_t
366 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
367 char *buf)
368 {
369 struct scsi_disk *sdkp = to_scsi_disk(dev);
370
371 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
372 }
373 static DEVICE_ATTR_RO(thin_provisioning);
374
375 static const char *lbp_mode[] = {
376 [SD_LBP_FULL] = "full",
377 [SD_LBP_UNMAP] = "unmap",
378 [SD_LBP_WS16] = "writesame_16",
379 [SD_LBP_WS10] = "writesame_10",
380 [SD_LBP_ZERO] = "writesame_zero",
381 [SD_LBP_DISABLE] = "disabled",
382 };
383
384 static ssize_t
385 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
386 char *buf)
387 {
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389
390 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
391 }
392
393 static ssize_t
394 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
395 const char *buf, size_t count)
396 {
397 struct scsi_disk *sdkp = to_scsi_disk(dev);
398 struct scsi_device *sdp = sdkp->device;
399
400 if (!capable(CAP_SYS_ADMIN))
401 return -EACCES;
402
403 if (sdp->type != TYPE_DISK)
404 return -EINVAL;
405
406 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
407 sd_config_discard(sdkp, SD_LBP_UNMAP);
408 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
409 sd_config_discard(sdkp, SD_LBP_WS16);
410 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
411 sd_config_discard(sdkp, SD_LBP_WS10);
412 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
413 sd_config_discard(sdkp, SD_LBP_ZERO);
414 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
415 sd_config_discard(sdkp, SD_LBP_DISABLE);
416 else
417 return -EINVAL;
418
419 return count;
420 }
421 static DEVICE_ATTR_RW(provisioning_mode);
422
423 static ssize_t
424 max_medium_access_timeouts_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426 {
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428
429 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
430 }
431
432 static ssize_t
433 max_medium_access_timeouts_store(struct device *dev,
434 struct device_attribute *attr, const char *buf,
435 size_t count)
436 {
437 struct scsi_disk *sdkp = to_scsi_disk(dev);
438 int err;
439
440 if (!capable(CAP_SYS_ADMIN))
441 return -EACCES;
442
443 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
444
445 return err ? err : count;
446 }
447 static DEVICE_ATTR_RW(max_medium_access_timeouts);
448
449 static ssize_t
450 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
451 char *buf)
452 {
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454
455 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
456 }
457
458 static ssize_t
459 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
460 const char *buf, size_t count)
461 {
462 struct scsi_disk *sdkp = to_scsi_disk(dev);
463 struct scsi_device *sdp = sdkp->device;
464 unsigned long max;
465 int err;
466
467 if (!capable(CAP_SYS_ADMIN))
468 return -EACCES;
469
470 if (sdp->type != TYPE_DISK)
471 return -EINVAL;
472
473 err = kstrtoul(buf, 10, &max);
474
475 if (err)
476 return err;
477
478 if (max == 0)
479 sdp->no_write_same = 1;
480 else if (max <= SD_MAX_WS16_BLOCKS) {
481 sdp->no_write_same = 0;
482 sdkp->max_ws_blocks = max;
483 }
484
485 sd_config_write_same(sdkp);
486
487 return count;
488 }
489 static DEVICE_ATTR_RW(max_write_same_blocks);
490
491 static struct attribute *sd_disk_attrs[] = {
492 &dev_attr_cache_type.attr,
493 &dev_attr_FUA.attr,
494 &dev_attr_allow_restart.attr,
495 &dev_attr_manage_start_stop.attr,
496 &dev_attr_protection_type.attr,
497 &dev_attr_protection_mode.attr,
498 &dev_attr_app_tag_own.attr,
499 &dev_attr_thin_provisioning.attr,
500 &dev_attr_provisioning_mode.attr,
501 &dev_attr_max_write_same_blocks.attr,
502 &dev_attr_max_medium_access_timeouts.attr,
503 NULL,
504 };
505 ATTRIBUTE_GROUPS(sd_disk);
506
507 static struct class sd_disk_class = {
508 .name = "scsi_disk",
509 .owner = THIS_MODULE,
510 .dev_release = scsi_disk_release,
511 .dev_groups = sd_disk_groups,
512 };
513
514 static const struct dev_pm_ops sd_pm_ops = {
515 .suspend = sd_suspend_system,
516 .resume = sd_resume,
517 .poweroff = sd_suspend_system,
518 .restore = sd_resume,
519 .runtime_suspend = sd_suspend_runtime,
520 .runtime_resume = sd_resume,
521 };
522
523 static struct scsi_driver sd_template = {
524 .gendrv = {
525 .name = "sd",
526 .owner = THIS_MODULE,
527 .probe = sd_probe,
528 .remove = sd_remove,
529 .shutdown = sd_shutdown,
530 .pm = &sd_pm_ops,
531 },
532 .rescan = sd_rescan,
533 .init_command = sd_init_command,
534 .uninit_command = sd_uninit_command,
535 .done = sd_done,
536 .eh_action = sd_eh_action,
537 };
538
539 /*
540 * Dummy kobj_map->probe function.
541 * The default ->probe function will call modprobe, which is
542 * pointless as this module is already loaded.
543 */
544 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
545 {
546 return NULL;
547 }
548
549 /*
550 * Device no to disk mapping:
551 *
552 * major disc2 disc p1
553 * |............|.............|....|....| <- dev_t
554 * 31 20 19 8 7 4 3 0
555 *
556 * Inside a major, we have 16k disks, however mapped non-
557 * contiguously. The first 16 disks are for major0, the next
558 * ones with major1, ... Disk 256 is for major0 again, disk 272
559 * for major1, ...
560 * As we stay compatible with our numbering scheme, we can reuse
561 * the well-know SCSI majors 8, 65--71, 136--143.
562 */
563 static int sd_major(int major_idx)
564 {
565 switch (major_idx) {
566 case 0:
567 return SCSI_DISK0_MAJOR;
568 case 1 ... 7:
569 return SCSI_DISK1_MAJOR + major_idx - 1;
570 case 8 ... 15:
571 return SCSI_DISK8_MAJOR + major_idx - 8;
572 default:
573 BUG();
574 return 0; /* shut up gcc */
575 }
576 }
577
578 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
579 {
580 struct scsi_disk *sdkp = NULL;
581
582 mutex_lock(&sd_ref_mutex);
583
584 if (disk->private_data) {
585 sdkp = scsi_disk(disk);
586 if (scsi_device_get(sdkp->device) == 0)
587 get_device(&sdkp->dev);
588 else
589 sdkp = NULL;
590 }
591 mutex_unlock(&sd_ref_mutex);
592 return sdkp;
593 }
594
595 static void scsi_disk_put(struct scsi_disk *sdkp)
596 {
597 struct scsi_device *sdev = sdkp->device;
598
599 mutex_lock(&sd_ref_mutex);
600 put_device(&sdkp->dev);
601 scsi_device_put(sdev);
602 mutex_unlock(&sd_ref_mutex);
603 }
604
605 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
606 unsigned int dix, unsigned int dif)
607 {
608 struct bio *bio = scmd->request->bio;
609 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
610 unsigned int protect = 0;
611
612 if (dix) { /* DIX Type 0, 1, 2, 3 */
613 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
614 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
615
616 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
617 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
618 }
619
620 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
621 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
622
623 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
624 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
625 }
626
627 if (dif) { /* DIX/DIF Type 1, 2, 3 */
628 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
629
630 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
631 protect = 3 << 5; /* Disable target PI checking */
632 else
633 protect = 1 << 5; /* Enable target PI checking */
634 }
635
636 scsi_set_prot_op(scmd, prot_op);
637 scsi_set_prot_type(scmd, dif);
638 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
639
640 return protect;
641 }
642
643 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
644 {
645 struct request_queue *q = sdkp->disk->queue;
646 unsigned int logical_block_size = sdkp->device->sector_size;
647 unsigned int max_blocks = 0;
648
649 q->limits.discard_zeroes_data = 0;
650
651 /*
652 * When LBPRZ is reported, discard alignment and granularity
653 * must be fixed to the logical block size. Otherwise the block
654 * layer will drop misaligned portions of the request which can
655 * lead to data corruption. If LBPRZ is not set, we honor the
656 * device preference.
657 */
658 if (sdkp->lbprz) {
659 q->limits.discard_alignment = 0;
660 q->limits.discard_granularity = logical_block_size;
661 } else {
662 q->limits.discard_alignment = sdkp->unmap_alignment *
663 logical_block_size;
664 q->limits.discard_granularity =
665 max(sdkp->physical_block_size,
666 sdkp->unmap_granularity * logical_block_size);
667 }
668
669 sdkp->provisioning_mode = mode;
670
671 switch (mode) {
672
673 case SD_LBP_DISABLE:
674 blk_queue_max_discard_sectors(q, 0);
675 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
676 return;
677
678 case SD_LBP_UNMAP:
679 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
680 (u32)SD_MAX_WS16_BLOCKS);
681 break;
682
683 case SD_LBP_WS16:
684 max_blocks = min_not_zero(sdkp->max_ws_blocks,
685 (u32)SD_MAX_WS16_BLOCKS);
686 q->limits.discard_zeroes_data = sdkp->lbprz;
687 break;
688
689 case SD_LBP_WS10:
690 max_blocks = min_not_zero(sdkp->max_ws_blocks,
691 (u32)SD_MAX_WS10_BLOCKS);
692 q->limits.discard_zeroes_data = sdkp->lbprz;
693 break;
694
695 case SD_LBP_ZERO:
696 max_blocks = min_not_zero(sdkp->max_ws_blocks,
697 (u32)SD_MAX_WS10_BLOCKS);
698 q->limits.discard_zeroes_data = 1;
699 break;
700 }
701
702 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
703 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
704 }
705
706 /**
707 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
708 * @sdp: scsi device to operate one
709 * @rq: Request to prepare
710 *
711 * Will issue either UNMAP or WRITE SAME(16) depending on preference
712 * indicated by target device.
713 **/
714 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
715 {
716 struct request *rq = cmd->request;
717 struct scsi_device *sdp = cmd->device;
718 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
719 sector_t sector = blk_rq_pos(rq);
720 unsigned int nr_sectors = blk_rq_sectors(rq);
721 unsigned int nr_bytes = blk_rq_bytes(rq);
722 unsigned int len;
723 int ret;
724 char *buf;
725 struct page *page;
726
727 sector >>= ilog2(sdp->sector_size) - 9;
728 nr_sectors >>= ilog2(sdp->sector_size) - 9;
729
730 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
731 if (!page)
732 return BLKPREP_DEFER;
733
734 switch (sdkp->provisioning_mode) {
735 case SD_LBP_UNMAP:
736 buf = page_address(page);
737
738 cmd->cmd_len = 10;
739 cmd->cmnd[0] = UNMAP;
740 cmd->cmnd[8] = 24;
741
742 put_unaligned_be16(6 + 16, &buf[0]);
743 put_unaligned_be16(16, &buf[2]);
744 put_unaligned_be64(sector, &buf[8]);
745 put_unaligned_be32(nr_sectors, &buf[16]);
746
747 len = 24;
748 break;
749
750 case SD_LBP_WS16:
751 cmd->cmd_len = 16;
752 cmd->cmnd[0] = WRITE_SAME_16;
753 cmd->cmnd[1] = 0x8; /* UNMAP */
754 put_unaligned_be64(sector, &cmd->cmnd[2]);
755 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
756
757 len = sdkp->device->sector_size;
758 break;
759
760 case SD_LBP_WS10:
761 case SD_LBP_ZERO:
762 cmd->cmd_len = 10;
763 cmd->cmnd[0] = WRITE_SAME;
764 if (sdkp->provisioning_mode == SD_LBP_WS10)
765 cmd->cmnd[1] = 0x8; /* UNMAP */
766 put_unaligned_be32(sector, &cmd->cmnd[2]);
767 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
768
769 len = sdkp->device->sector_size;
770 break;
771
772 default:
773 ret = BLKPREP_INVALID;
774 goto out;
775 }
776
777 rq->completion_data = page;
778 rq->timeout = SD_TIMEOUT;
779
780 cmd->transfersize = len;
781 cmd->allowed = SD_MAX_RETRIES;
782
783 /*
784 * Initially __data_len is set to the amount of data that needs to be
785 * transferred to the target. This amount depends on whether WRITE SAME
786 * or UNMAP is being used. After the scatterlist has been mapped by
787 * scsi_init_io() we set __data_len to the size of the area to be
788 * discarded on disk. This allows us to report completion on the full
789 * amount of blocks described by the request.
790 */
791 blk_add_request_payload(rq, page, 0, len);
792 ret = scsi_init_io(cmd);
793 rq->__data_len = nr_bytes;
794
795 out:
796 if (ret != BLKPREP_OK)
797 __free_page(page);
798 return ret;
799 }
800
801 static void sd_config_write_same(struct scsi_disk *sdkp)
802 {
803 struct request_queue *q = sdkp->disk->queue;
804 unsigned int logical_block_size = sdkp->device->sector_size;
805
806 if (sdkp->device->no_write_same) {
807 sdkp->max_ws_blocks = 0;
808 goto out;
809 }
810
811 /* Some devices can not handle block counts above 0xffff despite
812 * supporting WRITE SAME(16). Consequently we default to 64k
813 * blocks per I/O unless the device explicitly advertises a
814 * bigger limit.
815 */
816 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
817 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
818 (u32)SD_MAX_WS16_BLOCKS);
819 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
820 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
821 (u32)SD_MAX_WS10_BLOCKS);
822 else {
823 sdkp->device->no_write_same = 1;
824 sdkp->max_ws_blocks = 0;
825 }
826
827 out:
828 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
829 (logical_block_size >> 9));
830 }
831
832 /**
833 * sd_setup_write_same_cmnd - write the same data to multiple blocks
834 * @cmd: command to prepare
835 *
836 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
837 * preference indicated by target device.
838 **/
839 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
840 {
841 struct request *rq = cmd->request;
842 struct scsi_device *sdp = cmd->device;
843 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
844 struct bio *bio = rq->bio;
845 sector_t sector = blk_rq_pos(rq);
846 unsigned int nr_sectors = blk_rq_sectors(rq);
847 unsigned int nr_bytes = blk_rq_bytes(rq);
848 int ret;
849
850 if (sdkp->device->no_write_same)
851 return BLKPREP_INVALID;
852
853 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
854
855 sector >>= ilog2(sdp->sector_size) - 9;
856 nr_sectors >>= ilog2(sdp->sector_size) - 9;
857
858 rq->timeout = SD_WRITE_SAME_TIMEOUT;
859
860 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
861 cmd->cmd_len = 16;
862 cmd->cmnd[0] = WRITE_SAME_16;
863 put_unaligned_be64(sector, &cmd->cmnd[2]);
864 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
865 } else {
866 cmd->cmd_len = 10;
867 cmd->cmnd[0] = WRITE_SAME;
868 put_unaligned_be32(sector, &cmd->cmnd[2]);
869 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
870 }
871
872 cmd->transfersize = sdp->sector_size;
873 cmd->allowed = SD_MAX_RETRIES;
874
875 /*
876 * For WRITE_SAME the data transferred in the DATA IN buffer is
877 * different from the amount of data actually written to the target.
878 *
879 * We set up __data_len to the amount of data transferred from the
880 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
881 * to transfer a single sector of data first, but then reset it to
882 * the amount of data to be written right after so that the I/O path
883 * knows how much to actually write.
884 */
885 rq->__data_len = sdp->sector_size;
886 ret = scsi_init_io(cmd);
887 rq->__data_len = nr_bytes;
888 return ret;
889 }
890
891 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
892 {
893 struct request *rq = cmd->request;
894
895 /* flush requests don't perform I/O, zero the S/G table */
896 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
897
898 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
899 cmd->cmd_len = 10;
900 cmd->transfersize = 0;
901 cmd->allowed = SD_MAX_RETRIES;
902
903 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
904 return BLKPREP_OK;
905 }
906
907 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
908 {
909 struct request *rq = SCpnt->request;
910 struct scsi_device *sdp = SCpnt->device;
911 struct gendisk *disk = rq->rq_disk;
912 struct scsi_disk *sdkp;
913 sector_t block = blk_rq_pos(rq);
914 sector_t threshold;
915 unsigned int this_count = blk_rq_sectors(rq);
916 unsigned int dif, dix;
917 int ret;
918 unsigned char protect;
919
920 ret = scsi_init_io(SCpnt);
921 if (ret != BLKPREP_OK)
922 goto out;
923 SCpnt = rq->special;
924 sdkp = scsi_disk(disk);
925
926 /* from here on until we're complete, any goto out
927 * is used for a killable error condition */
928 ret = BLKPREP_KILL;
929
930 SCSI_LOG_HLQUEUE(1,
931 scmd_printk(KERN_INFO, SCpnt,
932 "%s: block=%llu, count=%d\n",
933 __func__, (unsigned long long)block, this_count));
934
935 if (!sdp || !scsi_device_online(sdp) ||
936 block + blk_rq_sectors(rq) > get_capacity(disk)) {
937 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
938 "Finishing %u sectors\n",
939 blk_rq_sectors(rq)));
940 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
941 "Retry with 0x%p\n", SCpnt));
942 goto out;
943 }
944
945 if (sdp->changed) {
946 /*
947 * quietly refuse to do anything to a changed disc until
948 * the changed bit has been reset
949 */
950 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
951 goto out;
952 }
953
954 /*
955 * Some SD card readers can't handle multi-sector accesses which touch
956 * the last one or two hardware sectors. Split accesses as needed.
957 */
958 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
959 (sdp->sector_size / 512);
960
961 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
962 if (block < threshold) {
963 /* Access up to the threshold but not beyond */
964 this_count = threshold - block;
965 } else {
966 /* Access only a single hardware sector */
967 this_count = sdp->sector_size / 512;
968 }
969 }
970
971 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
972 (unsigned long long)block));
973
974 /*
975 * If we have a 1K hardware sectorsize, prevent access to single
976 * 512 byte sectors. In theory we could handle this - in fact
977 * the scsi cdrom driver must be able to handle this because
978 * we typically use 1K blocksizes, and cdroms typically have
979 * 2K hardware sectorsizes. Of course, things are simpler
980 * with the cdrom, since it is read-only. For performance
981 * reasons, the filesystems should be able to handle this
982 * and not force the scsi disk driver to use bounce buffers
983 * for this.
984 */
985 if (sdp->sector_size == 1024) {
986 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
987 scmd_printk(KERN_ERR, SCpnt,
988 "Bad block number requested\n");
989 goto out;
990 } else {
991 block = block >> 1;
992 this_count = this_count >> 1;
993 }
994 }
995 if (sdp->sector_size == 2048) {
996 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
997 scmd_printk(KERN_ERR, SCpnt,
998 "Bad block number requested\n");
999 goto out;
1000 } else {
1001 block = block >> 2;
1002 this_count = this_count >> 2;
1003 }
1004 }
1005 if (sdp->sector_size == 4096) {
1006 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1007 scmd_printk(KERN_ERR, SCpnt,
1008 "Bad block number requested\n");
1009 goto out;
1010 } else {
1011 block = block >> 3;
1012 this_count = this_count >> 3;
1013 }
1014 }
1015 if (rq_data_dir(rq) == WRITE) {
1016 SCpnt->cmnd[0] = WRITE_6;
1017
1018 if (blk_integrity_rq(rq))
1019 sd_dif_prepare(SCpnt);
1020
1021 } else if (rq_data_dir(rq) == READ) {
1022 SCpnt->cmnd[0] = READ_6;
1023 } else {
1024 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llu,%llx\n",
1025 req_op(rq), (unsigned long long) rq->cmd_flags);
1026 goto out;
1027 }
1028
1029 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1030 "%s %d/%u 512 byte blocks.\n",
1031 (rq_data_dir(rq) == WRITE) ?
1032 "writing" : "reading", this_count,
1033 blk_rq_sectors(rq)));
1034
1035 dix = scsi_prot_sg_count(SCpnt);
1036 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1037
1038 if (dif || dix)
1039 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1040 else
1041 protect = 0;
1042
1043 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1044 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1045
1046 if (unlikely(SCpnt->cmnd == NULL)) {
1047 ret = BLKPREP_DEFER;
1048 goto out;
1049 }
1050
1051 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1052 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1053 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1054 SCpnt->cmnd[7] = 0x18;
1055 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1056 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1057
1058 /* LBA */
1059 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1060 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1061 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1062 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1063 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1064 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1065 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1066 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1067
1068 /* Expected Indirect LBA */
1069 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1070 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1071 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1072 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1073
1074 /* Transfer length */
1075 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1076 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1077 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1078 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1079 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1080 SCpnt->cmnd[0] += READ_16 - READ_6;
1081 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1082 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1083 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1084 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1085 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1086 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1087 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1088 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1089 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1090 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1091 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1092 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1093 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1094 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1095 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1096 scsi_device_protection(SCpnt->device) ||
1097 SCpnt->device->use_10_for_rw) {
1098 SCpnt->cmnd[0] += READ_10 - READ_6;
1099 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1100 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1101 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1102 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1103 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1104 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1105 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1106 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1107 } else {
1108 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1109 /*
1110 * This happens only if this drive failed
1111 * 10byte rw command with ILLEGAL_REQUEST
1112 * during operation and thus turned off
1113 * use_10_for_rw.
1114 */
1115 scmd_printk(KERN_ERR, SCpnt,
1116 "FUA write on READ/WRITE(6) drive\n");
1117 goto out;
1118 }
1119
1120 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1121 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1122 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1123 SCpnt->cmnd[4] = (unsigned char) this_count;
1124 SCpnt->cmnd[5] = 0;
1125 }
1126 SCpnt->sdb.length = this_count * sdp->sector_size;
1127
1128 /*
1129 * We shouldn't disconnect in the middle of a sector, so with a dumb
1130 * host adapter, it's safe to assume that we can at least transfer
1131 * this many bytes between each connect / disconnect.
1132 */
1133 SCpnt->transfersize = sdp->sector_size;
1134 SCpnt->underflow = this_count << 9;
1135 SCpnt->allowed = SD_MAX_RETRIES;
1136
1137 /*
1138 * This indicates that the command is ready from our end to be
1139 * queued.
1140 */
1141 ret = BLKPREP_OK;
1142 out:
1143 return ret;
1144 }
1145
1146 static int sd_init_command(struct scsi_cmnd *cmd)
1147 {
1148 struct request *rq = cmd->request;
1149
1150 switch (req_op(rq)) {
1151 case REQ_OP_DISCARD:
1152 return sd_setup_discard_cmnd(cmd);
1153 case REQ_OP_WRITE_SAME:
1154 return sd_setup_write_same_cmnd(cmd);
1155 case REQ_OP_FLUSH:
1156 return sd_setup_flush_cmnd(cmd);
1157 case REQ_OP_READ:
1158 case REQ_OP_WRITE:
1159 return sd_setup_read_write_cmnd(cmd);
1160 default:
1161 BUG();
1162 }
1163 }
1164
1165 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1166 {
1167 struct request *rq = SCpnt->request;
1168
1169 if (req_op(rq) == REQ_OP_DISCARD)
1170 __free_page(rq->completion_data);
1171
1172 if (SCpnt->cmnd != rq->cmd) {
1173 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1174 SCpnt->cmnd = NULL;
1175 SCpnt->cmd_len = 0;
1176 }
1177 }
1178
1179 /**
1180 * sd_open - open a scsi disk device
1181 * @inode: only i_rdev member may be used
1182 * @filp: only f_mode and f_flags may be used
1183 *
1184 * Returns 0 if successful. Returns a negated errno value in case
1185 * of error.
1186 *
1187 * Note: This can be called from a user context (e.g. fsck(1) )
1188 * or from within the kernel (e.g. as a result of a mount(1) ).
1189 * In the latter case @inode and @filp carry an abridged amount
1190 * of information as noted above.
1191 *
1192 * Locking: called with bdev->bd_mutex held.
1193 **/
1194 static int sd_open(struct block_device *bdev, fmode_t mode)
1195 {
1196 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1197 struct scsi_device *sdev;
1198 int retval;
1199
1200 if (!sdkp)
1201 return -ENXIO;
1202
1203 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1204
1205 sdev = sdkp->device;
1206
1207 /*
1208 * If the device is in error recovery, wait until it is done.
1209 * If the device is offline, then disallow any access to it.
1210 */
1211 retval = -ENXIO;
1212 if (!scsi_block_when_processing_errors(sdev))
1213 goto error_out;
1214
1215 if (sdev->removable || sdkp->write_prot)
1216 check_disk_change(bdev);
1217
1218 /*
1219 * If the drive is empty, just let the open fail.
1220 */
1221 retval = -ENOMEDIUM;
1222 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1223 goto error_out;
1224
1225 /*
1226 * If the device has the write protect tab set, have the open fail
1227 * if the user expects to be able to write to the thing.
1228 */
1229 retval = -EROFS;
1230 if (sdkp->write_prot && (mode & FMODE_WRITE))
1231 goto error_out;
1232
1233 /*
1234 * It is possible that the disk changing stuff resulted in
1235 * the device being taken offline. If this is the case,
1236 * report this to the user, and don't pretend that the
1237 * open actually succeeded.
1238 */
1239 retval = -ENXIO;
1240 if (!scsi_device_online(sdev))
1241 goto error_out;
1242
1243 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1244 if (scsi_block_when_processing_errors(sdev))
1245 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1246 }
1247
1248 return 0;
1249
1250 error_out:
1251 scsi_disk_put(sdkp);
1252 return retval;
1253 }
1254
1255 /**
1256 * sd_release - invoked when the (last) close(2) is called on this
1257 * scsi disk.
1258 * @inode: only i_rdev member may be used
1259 * @filp: only f_mode and f_flags may be used
1260 *
1261 * Returns 0.
1262 *
1263 * Note: may block (uninterruptible) if error recovery is underway
1264 * on this disk.
1265 *
1266 * Locking: called with bdev->bd_mutex held.
1267 **/
1268 static void sd_release(struct gendisk *disk, fmode_t mode)
1269 {
1270 struct scsi_disk *sdkp = scsi_disk(disk);
1271 struct scsi_device *sdev = sdkp->device;
1272
1273 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1274
1275 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1276 if (scsi_block_when_processing_errors(sdev))
1277 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1278 }
1279
1280 /*
1281 * XXX and what if there are packets in flight and this close()
1282 * XXX is followed by a "rmmod sd_mod"?
1283 */
1284
1285 scsi_disk_put(sdkp);
1286 }
1287
1288 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1289 {
1290 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1291 struct scsi_device *sdp = sdkp->device;
1292 struct Scsi_Host *host = sdp->host;
1293 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1294 int diskinfo[4];
1295
1296 /* default to most commonly used values */
1297 diskinfo[0] = 0x40; /* 1 << 6 */
1298 diskinfo[1] = 0x20; /* 1 << 5 */
1299 diskinfo[2] = capacity >> 11;
1300
1301 /* override with calculated, extended default, or driver values */
1302 if (host->hostt->bios_param)
1303 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1304 else
1305 scsicam_bios_param(bdev, capacity, diskinfo);
1306
1307 geo->heads = diskinfo[0];
1308 geo->sectors = diskinfo[1];
1309 geo->cylinders = diskinfo[2];
1310 return 0;
1311 }
1312
1313 /**
1314 * sd_ioctl - process an ioctl
1315 * @inode: only i_rdev/i_bdev members may be used
1316 * @filp: only f_mode and f_flags may be used
1317 * @cmd: ioctl command number
1318 * @arg: this is third argument given to ioctl(2) system call.
1319 * Often contains a pointer.
1320 *
1321 * Returns 0 if successful (some ioctls return positive numbers on
1322 * success as well). Returns a negated errno value in case of error.
1323 *
1324 * Note: most ioctls are forward onto the block subsystem or further
1325 * down in the scsi subsystem.
1326 **/
1327 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1328 unsigned int cmd, unsigned long arg)
1329 {
1330 struct gendisk *disk = bdev->bd_disk;
1331 struct scsi_disk *sdkp = scsi_disk(disk);
1332 struct scsi_device *sdp = sdkp->device;
1333 void __user *p = (void __user *)arg;
1334 int error;
1335
1336 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1337 "cmd=0x%x\n", disk->disk_name, cmd));
1338
1339 error = scsi_verify_blk_ioctl(bdev, cmd);
1340 if (error < 0)
1341 return error;
1342
1343 /*
1344 * If we are in the middle of error recovery, don't let anyone
1345 * else try and use this device. Also, if error recovery fails, it
1346 * may try and take the device offline, in which case all further
1347 * access to the device is prohibited.
1348 */
1349 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1350 (mode & FMODE_NDELAY) != 0);
1351 if (error)
1352 goto out;
1353
1354 /*
1355 * Send SCSI addressing ioctls directly to mid level, send other
1356 * ioctls to block level and then onto mid level if they can't be
1357 * resolved.
1358 */
1359 switch (cmd) {
1360 case SCSI_IOCTL_GET_IDLUN:
1361 case SCSI_IOCTL_GET_BUS_NUMBER:
1362 error = scsi_ioctl(sdp, cmd, p);
1363 break;
1364 default:
1365 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1366 if (error != -ENOTTY)
1367 break;
1368 error = scsi_ioctl(sdp, cmd, p);
1369 break;
1370 }
1371 out:
1372 return error;
1373 }
1374
1375 static void set_media_not_present(struct scsi_disk *sdkp)
1376 {
1377 if (sdkp->media_present)
1378 sdkp->device->changed = 1;
1379
1380 if (sdkp->device->removable) {
1381 sdkp->media_present = 0;
1382 sdkp->capacity = 0;
1383 }
1384 }
1385
1386 static int media_not_present(struct scsi_disk *sdkp,
1387 struct scsi_sense_hdr *sshdr)
1388 {
1389 if (!scsi_sense_valid(sshdr))
1390 return 0;
1391
1392 /* not invoked for commands that could return deferred errors */
1393 switch (sshdr->sense_key) {
1394 case UNIT_ATTENTION:
1395 case NOT_READY:
1396 /* medium not present */
1397 if (sshdr->asc == 0x3A) {
1398 set_media_not_present(sdkp);
1399 return 1;
1400 }
1401 }
1402 return 0;
1403 }
1404
1405 /**
1406 * sd_check_events - check media events
1407 * @disk: kernel device descriptor
1408 * @clearing: disk events currently being cleared
1409 *
1410 * Returns mask of DISK_EVENT_*.
1411 *
1412 * Note: this function is invoked from the block subsystem.
1413 **/
1414 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1415 {
1416 struct scsi_disk *sdkp = scsi_disk_get(disk);
1417 struct scsi_device *sdp;
1418 struct scsi_sense_hdr *sshdr = NULL;
1419 int retval;
1420
1421 if (!sdkp)
1422 return 0;
1423
1424 sdp = sdkp->device;
1425 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1426
1427 /*
1428 * If the device is offline, don't send any commands - just pretend as
1429 * if the command failed. If the device ever comes back online, we
1430 * can deal with it then. It is only because of unrecoverable errors
1431 * that we would ever take a device offline in the first place.
1432 */
1433 if (!scsi_device_online(sdp)) {
1434 set_media_not_present(sdkp);
1435 goto out;
1436 }
1437
1438 /*
1439 * Using TEST_UNIT_READY enables differentiation between drive with
1440 * no cartridge loaded - NOT READY, drive with changed cartridge -
1441 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1442 *
1443 * Drives that auto spin down. eg iomega jaz 1G, will be started
1444 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1445 * sd_revalidate() is called.
1446 */
1447 retval = -ENODEV;
1448
1449 if (scsi_block_when_processing_errors(sdp)) {
1450 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1451 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1452 sshdr);
1453 }
1454
1455 /* failed to execute TUR, assume media not present */
1456 if (host_byte(retval)) {
1457 set_media_not_present(sdkp);
1458 goto out;
1459 }
1460
1461 if (media_not_present(sdkp, sshdr))
1462 goto out;
1463
1464 /*
1465 * For removable scsi disk we have to recognise the presence
1466 * of a disk in the drive.
1467 */
1468 if (!sdkp->media_present)
1469 sdp->changed = 1;
1470 sdkp->media_present = 1;
1471 out:
1472 /*
1473 * sdp->changed is set under the following conditions:
1474 *
1475 * Medium present state has changed in either direction.
1476 * Device has indicated UNIT_ATTENTION.
1477 */
1478 kfree(sshdr);
1479 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1480 sdp->changed = 0;
1481 scsi_disk_put(sdkp);
1482 return retval;
1483 }
1484
1485 static int sd_sync_cache(struct scsi_disk *sdkp)
1486 {
1487 int retries, res;
1488 struct scsi_device *sdp = sdkp->device;
1489 const int timeout = sdp->request_queue->rq_timeout
1490 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1491 struct scsi_sense_hdr sshdr;
1492
1493 if (!scsi_device_online(sdp))
1494 return -ENODEV;
1495
1496 for (retries = 3; retries > 0; --retries) {
1497 unsigned char cmd[10] = { 0 };
1498
1499 cmd[0] = SYNCHRONIZE_CACHE;
1500 /*
1501 * Leave the rest of the command zero to indicate
1502 * flush everything.
1503 */
1504 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1505 &sshdr, timeout, SD_MAX_RETRIES,
1506 NULL, REQ_PM);
1507 if (res == 0)
1508 break;
1509 }
1510
1511 if (res) {
1512 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1513
1514 if (driver_byte(res) & DRIVER_SENSE)
1515 sd_print_sense_hdr(sdkp, &sshdr);
1516 /* we need to evaluate the error return */
1517 if (scsi_sense_valid(&sshdr) &&
1518 (sshdr.asc == 0x3a || /* medium not present */
1519 sshdr.asc == 0x20)) /* invalid command */
1520 /* this is no error here */
1521 return 0;
1522
1523 switch (host_byte(res)) {
1524 /* ignore errors due to racing a disconnection */
1525 case DID_BAD_TARGET:
1526 case DID_NO_CONNECT:
1527 return 0;
1528 /* signal the upper layer it might try again */
1529 case DID_BUS_BUSY:
1530 case DID_IMM_RETRY:
1531 case DID_REQUEUE:
1532 case DID_SOFT_ERROR:
1533 return -EBUSY;
1534 default:
1535 return -EIO;
1536 }
1537 }
1538 return 0;
1539 }
1540
1541 static void sd_rescan(struct device *dev)
1542 {
1543 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1544
1545 revalidate_disk(sdkp->disk);
1546 }
1547
1548
1549 #ifdef CONFIG_COMPAT
1550 /*
1551 * This gets directly called from VFS. When the ioctl
1552 * is not recognized we go back to the other translation paths.
1553 */
1554 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1555 unsigned int cmd, unsigned long arg)
1556 {
1557 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1558 int error;
1559
1560 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1561 (mode & FMODE_NDELAY) != 0);
1562 if (error)
1563 return error;
1564
1565 /*
1566 * Let the static ioctl translation table take care of it.
1567 */
1568 if (!sdev->host->hostt->compat_ioctl)
1569 return -ENOIOCTLCMD;
1570 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1571 }
1572 #endif
1573
1574 static char sd_pr_type(enum pr_type type)
1575 {
1576 switch (type) {
1577 case PR_WRITE_EXCLUSIVE:
1578 return 0x01;
1579 case PR_EXCLUSIVE_ACCESS:
1580 return 0x03;
1581 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1582 return 0x05;
1583 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1584 return 0x06;
1585 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1586 return 0x07;
1587 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1588 return 0x08;
1589 default:
1590 return 0;
1591 }
1592 };
1593
1594 static int sd_pr_command(struct block_device *bdev, u8 sa,
1595 u64 key, u64 sa_key, u8 type, u8 flags)
1596 {
1597 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1598 struct scsi_sense_hdr sshdr;
1599 int result;
1600 u8 cmd[16] = { 0, };
1601 u8 data[24] = { 0, };
1602
1603 cmd[0] = PERSISTENT_RESERVE_OUT;
1604 cmd[1] = sa;
1605 cmd[2] = type;
1606 put_unaligned_be32(sizeof(data), &cmd[5]);
1607
1608 put_unaligned_be64(key, &data[0]);
1609 put_unaligned_be64(sa_key, &data[8]);
1610 data[20] = flags;
1611
1612 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1613 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1614
1615 if ((driver_byte(result) & DRIVER_SENSE) &&
1616 (scsi_sense_valid(&sshdr))) {
1617 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1618 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1619 }
1620
1621 return result;
1622 }
1623
1624 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1625 u32 flags)
1626 {
1627 if (flags & ~PR_FL_IGNORE_KEY)
1628 return -EOPNOTSUPP;
1629 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1630 old_key, new_key, 0,
1631 (1 << 0) /* APTPL */);
1632 }
1633
1634 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1635 u32 flags)
1636 {
1637 if (flags)
1638 return -EOPNOTSUPP;
1639 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1640 }
1641
1642 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1643 {
1644 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1645 }
1646
1647 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1648 enum pr_type type, bool abort)
1649 {
1650 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1651 sd_pr_type(type), 0);
1652 }
1653
1654 static int sd_pr_clear(struct block_device *bdev, u64 key)
1655 {
1656 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1657 }
1658
1659 static const struct pr_ops sd_pr_ops = {
1660 .pr_register = sd_pr_register,
1661 .pr_reserve = sd_pr_reserve,
1662 .pr_release = sd_pr_release,
1663 .pr_preempt = sd_pr_preempt,
1664 .pr_clear = sd_pr_clear,
1665 };
1666
1667 static const struct block_device_operations sd_fops = {
1668 .owner = THIS_MODULE,
1669 .open = sd_open,
1670 .release = sd_release,
1671 .ioctl = sd_ioctl,
1672 .getgeo = sd_getgeo,
1673 #ifdef CONFIG_COMPAT
1674 .compat_ioctl = sd_compat_ioctl,
1675 #endif
1676 .check_events = sd_check_events,
1677 .revalidate_disk = sd_revalidate_disk,
1678 .unlock_native_capacity = sd_unlock_native_capacity,
1679 .pr_ops = &sd_pr_ops,
1680 };
1681
1682 /**
1683 * sd_eh_action - error handling callback
1684 * @scmd: sd-issued command that has failed
1685 * @eh_disp: The recovery disposition suggested by the midlayer
1686 *
1687 * This function is called by the SCSI midlayer upon completion of an
1688 * error test command (currently TEST UNIT READY). The result of sending
1689 * the eh command is passed in eh_disp. We're looking for devices that
1690 * fail medium access commands but are OK with non access commands like
1691 * test unit ready (so wrongly see the device as having a successful
1692 * recovery)
1693 **/
1694 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1695 {
1696 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1697
1698 if (!scsi_device_online(scmd->device) ||
1699 !scsi_medium_access_command(scmd) ||
1700 host_byte(scmd->result) != DID_TIME_OUT ||
1701 eh_disp != SUCCESS)
1702 return eh_disp;
1703
1704 /*
1705 * The device has timed out executing a medium access command.
1706 * However, the TEST UNIT READY command sent during error
1707 * handling completed successfully. Either the device is in the
1708 * process of recovering or has it suffered an internal failure
1709 * that prevents access to the storage medium.
1710 */
1711 sdkp->medium_access_timed_out++;
1712
1713 /*
1714 * If the device keeps failing read/write commands but TEST UNIT
1715 * READY always completes successfully we assume that medium
1716 * access is no longer possible and take the device offline.
1717 */
1718 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1719 scmd_printk(KERN_ERR, scmd,
1720 "Medium access timeout failure. Offlining disk!\n");
1721 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1722
1723 return FAILED;
1724 }
1725
1726 return eh_disp;
1727 }
1728
1729 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1730 {
1731 u64 start_lba = blk_rq_pos(scmd->request);
1732 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1733 u64 factor = scmd->device->sector_size / 512;
1734 u64 bad_lba;
1735 int info_valid;
1736 /*
1737 * resid is optional but mostly filled in. When it's unused,
1738 * its value is zero, so we assume the whole buffer transferred
1739 */
1740 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1741 unsigned int good_bytes;
1742
1743 if (scmd->request->cmd_type != REQ_TYPE_FS)
1744 return 0;
1745
1746 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1747 SCSI_SENSE_BUFFERSIZE,
1748 &bad_lba);
1749 if (!info_valid)
1750 return 0;
1751
1752 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1753 return 0;
1754
1755 /* be careful ... don't want any overflows */
1756 do_div(start_lba, factor);
1757 do_div(end_lba, factor);
1758
1759 /* The bad lba was reported incorrectly, we have no idea where
1760 * the error is.
1761 */
1762 if (bad_lba < start_lba || bad_lba >= end_lba)
1763 return 0;
1764
1765 /* This computation should always be done in terms of
1766 * the resolution of the device's medium.
1767 */
1768 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1769 return min(good_bytes, transferred);
1770 }
1771
1772 /**
1773 * sd_done - bottom half handler: called when the lower level
1774 * driver has completed (successfully or otherwise) a scsi command.
1775 * @SCpnt: mid-level's per command structure.
1776 *
1777 * Note: potentially run from within an ISR. Must not block.
1778 **/
1779 static int sd_done(struct scsi_cmnd *SCpnt)
1780 {
1781 int result = SCpnt->result;
1782 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1783 struct scsi_sense_hdr sshdr;
1784 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1785 struct request *req = SCpnt->request;
1786 int sense_valid = 0;
1787 int sense_deferred = 0;
1788 unsigned char op = SCpnt->cmnd[0];
1789 unsigned char unmap = SCpnt->cmnd[1] & 8;
1790
1791 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_SAME) {
1792 if (!result) {
1793 good_bytes = blk_rq_bytes(req);
1794 scsi_set_resid(SCpnt, 0);
1795 } else {
1796 good_bytes = 0;
1797 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1798 }
1799 }
1800
1801 if (result) {
1802 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1803 if (sense_valid)
1804 sense_deferred = scsi_sense_is_deferred(&sshdr);
1805 }
1806 sdkp->medium_access_timed_out = 0;
1807
1808 if (driver_byte(result) != DRIVER_SENSE &&
1809 (!sense_valid || sense_deferred))
1810 goto out;
1811
1812 switch (sshdr.sense_key) {
1813 case HARDWARE_ERROR:
1814 case MEDIUM_ERROR:
1815 good_bytes = sd_completed_bytes(SCpnt);
1816 break;
1817 case RECOVERED_ERROR:
1818 good_bytes = scsi_bufflen(SCpnt);
1819 break;
1820 case NO_SENSE:
1821 /* This indicates a false check condition, so ignore it. An
1822 * unknown amount of data was transferred so treat it as an
1823 * error.
1824 */
1825 SCpnt->result = 0;
1826 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1827 break;
1828 case ABORTED_COMMAND:
1829 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1830 good_bytes = sd_completed_bytes(SCpnt);
1831 break;
1832 case ILLEGAL_REQUEST:
1833 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1834 good_bytes = sd_completed_bytes(SCpnt);
1835 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1836 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1837 switch (op) {
1838 case UNMAP:
1839 sd_config_discard(sdkp, SD_LBP_DISABLE);
1840 break;
1841 case WRITE_SAME_16:
1842 case WRITE_SAME:
1843 if (unmap)
1844 sd_config_discard(sdkp, SD_LBP_DISABLE);
1845 else {
1846 sdkp->device->no_write_same = 1;
1847 sd_config_write_same(sdkp);
1848
1849 good_bytes = 0;
1850 req->__data_len = blk_rq_bytes(req);
1851 req->cmd_flags |= REQ_QUIET;
1852 }
1853 }
1854 }
1855 break;
1856 default:
1857 break;
1858 }
1859 out:
1860 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1861 "sd_done: completed %d of %d bytes\n",
1862 good_bytes, scsi_bufflen(SCpnt)));
1863
1864 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1865 sd_dif_complete(SCpnt, good_bytes);
1866
1867 return good_bytes;
1868 }
1869
1870 /*
1871 * spinup disk - called only in sd_revalidate_disk()
1872 */
1873 static void
1874 sd_spinup_disk(struct scsi_disk *sdkp)
1875 {
1876 unsigned char cmd[10];
1877 unsigned long spintime_expire = 0;
1878 int retries, spintime;
1879 unsigned int the_result;
1880 struct scsi_sense_hdr sshdr;
1881 int sense_valid = 0;
1882
1883 spintime = 0;
1884
1885 /* Spin up drives, as required. Only do this at boot time */
1886 /* Spinup needs to be done for module loads too. */
1887 do {
1888 retries = 0;
1889
1890 do {
1891 cmd[0] = TEST_UNIT_READY;
1892 memset((void *) &cmd[1], 0, 9);
1893
1894 the_result = scsi_execute_req(sdkp->device, cmd,
1895 DMA_NONE, NULL, 0,
1896 &sshdr, SD_TIMEOUT,
1897 SD_MAX_RETRIES, NULL);
1898
1899 /*
1900 * If the drive has indicated to us that it
1901 * doesn't have any media in it, don't bother
1902 * with any more polling.
1903 */
1904 if (media_not_present(sdkp, &sshdr))
1905 return;
1906
1907 if (the_result)
1908 sense_valid = scsi_sense_valid(&sshdr);
1909 retries++;
1910 } while (retries < 3 &&
1911 (!scsi_status_is_good(the_result) ||
1912 ((driver_byte(the_result) & DRIVER_SENSE) &&
1913 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1914
1915 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1916 /* no sense, TUR either succeeded or failed
1917 * with a status error */
1918 if(!spintime && !scsi_status_is_good(the_result)) {
1919 sd_print_result(sdkp, "Test Unit Ready failed",
1920 the_result);
1921 }
1922 break;
1923 }
1924
1925 /*
1926 * The device does not want the automatic start to be issued.
1927 */
1928 if (sdkp->device->no_start_on_add)
1929 break;
1930
1931 if (sense_valid && sshdr.sense_key == NOT_READY) {
1932 if (sshdr.asc == 4 && sshdr.ascq == 3)
1933 break; /* manual intervention required */
1934 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1935 break; /* standby */
1936 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1937 break; /* unavailable */
1938 if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
1939 break; /* sanitize in progress */
1940 /*
1941 * Issue command to spin up drive when not ready
1942 */
1943 if (!spintime) {
1944 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1945 cmd[0] = START_STOP;
1946 cmd[1] = 1; /* Return immediately */
1947 memset((void *) &cmd[2], 0, 8);
1948 cmd[4] = 1; /* Start spin cycle */
1949 if (sdkp->device->start_stop_pwr_cond)
1950 cmd[4] |= 1 << 4;
1951 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1952 NULL, 0, &sshdr,
1953 SD_TIMEOUT, SD_MAX_RETRIES,
1954 NULL);
1955 spintime_expire = jiffies + 100 * HZ;
1956 spintime = 1;
1957 }
1958 /* Wait 1 second for next try */
1959 msleep(1000);
1960 printk(".");
1961
1962 /*
1963 * Wait for USB flash devices with slow firmware.
1964 * Yes, this sense key/ASC combination shouldn't
1965 * occur here. It's characteristic of these devices.
1966 */
1967 } else if (sense_valid &&
1968 sshdr.sense_key == UNIT_ATTENTION &&
1969 sshdr.asc == 0x28) {
1970 if (!spintime) {
1971 spintime_expire = jiffies + 5 * HZ;
1972 spintime = 1;
1973 }
1974 /* Wait 1 second for next try */
1975 msleep(1000);
1976 } else {
1977 /* we don't understand the sense code, so it's
1978 * probably pointless to loop */
1979 if(!spintime) {
1980 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1981 sd_print_sense_hdr(sdkp, &sshdr);
1982 }
1983 break;
1984 }
1985
1986 } while (spintime && time_before_eq(jiffies, spintime_expire));
1987
1988 if (spintime) {
1989 if (scsi_status_is_good(the_result))
1990 printk("ready\n");
1991 else
1992 printk("not responding...\n");
1993 }
1994 }
1995
1996
1997 /*
1998 * Determine whether disk supports Data Integrity Field.
1999 */
2000 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2001 {
2002 struct scsi_device *sdp = sdkp->device;
2003 u8 type;
2004 int ret = 0;
2005
2006 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2007 return ret;
2008
2009 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2010
2011 if (type > T10_PI_TYPE3_PROTECTION)
2012 ret = -ENODEV;
2013 else if (scsi_host_dif_capable(sdp->host, type))
2014 ret = 1;
2015
2016 if (sdkp->first_scan || type != sdkp->protection_type)
2017 switch (ret) {
2018 case -ENODEV:
2019 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2020 " protection type %u. Disabling disk!\n",
2021 type);
2022 break;
2023 case 1:
2024 sd_printk(KERN_NOTICE, sdkp,
2025 "Enabling DIF Type %u protection\n", type);
2026 break;
2027 case 0:
2028 sd_printk(KERN_NOTICE, sdkp,
2029 "Disabling DIF Type %u protection\n", type);
2030 break;
2031 }
2032
2033 sdkp->protection_type = type;
2034
2035 return ret;
2036 }
2037
2038 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2039 struct scsi_sense_hdr *sshdr, int sense_valid,
2040 int the_result)
2041 {
2042 if (driver_byte(the_result) & DRIVER_SENSE)
2043 sd_print_sense_hdr(sdkp, sshdr);
2044 else
2045 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2046
2047 /*
2048 * Set dirty bit for removable devices if not ready -
2049 * sometimes drives will not report this properly.
2050 */
2051 if (sdp->removable &&
2052 sense_valid && sshdr->sense_key == NOT_READY)
2053 set_media_not_present(sdkp);
2054
2055 /*
2056 * We used to set media_present to 0 here to indicate no media
2057 * in the drive, but some drives fail read capacity even with
2058 * media present, so we can't do that.
2059 */
2060 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2061 }
2062
2063 #define RC16_LEN 32
2064 #if RC16_LEN > SD_BUF_SIZE
2065 #error RC16_LEN must not be more than SD_BUF_SIZE
2066 #endif
2067
2068 #define READ_CAPACITY_RETRIES_ON_RESET 10
2069
2070 /*
2071 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2072 * and the reported logical block size is bigger than 512 bytes. Note
2073 * that last_sector is a u64 and therefore logical_to_sectors() is not
2074 * applicable.
2075 */
2076 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2077 {
2078 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2079
2080 if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2081 return false;
2082
2083 return true;
2084 }
2085
2086 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2087 unsigned char *buffer)
2088 {
2089 unsigned char cmd[16];
2090 struct scsi_sense_hdr sshdr;
2091 int sense_valid = 0;
2092 int the_result;
2093 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2094 unsigned int alignment;
2095 unsigned long long lba;
2096 unsigned sector_size;
2097
2098 if (sdp->no_read_capacity_16)
2099 return -EINVAL;
2100
2101 do {
2102 memset(cmd, 0, 16);
2103 cmd[0] = SERVICE_ACTION_IN_16;
2104 cmd[1] = SAI_READ_CAPACITY_16;
2105 cmd[13] = RC16_LEN;
2106 memset(buffer, 0, RC16_LEN);
2107
2108 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2109 buffer, RC16_LEN, &sshdr,
2110 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2111
2112 if (media_not_present(sdkp, &sshdr))
2113 return -ENODEV;
2114
2115 if (the_result) {
2116 sense_valid = scsi_sense_valid(&sshdr);
2117 if (sense_valid &&
2118 sshdr.sense_key == ILLEGAL_REQUEST &&
2119 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2120 sshdr.ascq == 0x00)
2121 /* Invalid Command Operation Code or
2122 * Invalid Field in CDB, just retry
2123 * silently with RC10 */
2124 return -EINVAL;
2125 if (sense_valid &&
2126 sshdr.sense_key == UNIT_ATTENTION &&
2127 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2128 /* Device reset might occur several times,
2129 * give it one more chance */
2130 if (--reset_retries > 0)
2131 continue;
2132 }
2133 retries--;
2134
2135 } while (the_result && retries);
2136
2137 if (the_result) {
2138 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2139 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2140 return -EINVAL;
2141 }
2142
2143 sector_size = get_unaligned_be32(&buffer[8]);
2144 lba = get_unaligned_be64(&buffer[0]);
2145
2146 if (sd_read_protection_type(sdkp, buffer) < 0) {
2147 sdkp->capacity = 0;
2148 return -ENODEV;
2149 }
2150
2151 if (!sd_addressable_capacity(lba, sector_size)) {
2152 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2153 "kernel compiled with support for large block "
2154 "devices.\n");
2155 sdkp->capacity = 0;
2156 return -EOVERFLOW;
2157 }
2158
2159 /* Logical blocks per physical block exponent */
2160 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2161
2162 /* Lowest aligned logical block */
2163 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2164 blk_queue_alignment_offset(sdp->request_queue, alignment);
2165 if (alignment && sdkp->first_scan)
2166 sd_printk(KERN_NOTICE, sdkp,
2167 "physical block alignment offset: %u\n", alignment);
2168
2169 if (buffer[14] & 0x80) { /* LBPME */
2170 sdkp->lbpme = 1;
2171
2172 if (buffer[14] & 0x40) /* LBPRZ */
2173 sdkp->lbprz = 1;
2174
2175 sd_config_discard(sdkp, SD_LBP_WS16);
2176 }
2177
2178 sdkp->capacity = lba + 1;
2179 return sector_size;
2180 }
2181
2182 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2183 unsigned char *buffer)
2184 {
2185 unsigned char cmd[16];
2186 struct scsi_sense_hdr sshdr;
2187 int sense_valid = 0;
2188 int the_result;
2189 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2190 sector_t lba;
2191 unsigned sector_size;
2192
2193 do {
2194 cmd[0] = READ_CAPACITY;
2195 memset(&cmd[1], 0, 9);
2196 memset(buffer, 0, 8);
2197
2198 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2199 buffer, 8, &sshdr,
2200 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2201
2202 if (media_not_present(sdkp, &sshdr))
2203 return -ENODEV;
2204
2205 if (the_result) {
2206 sense_valid = scsi_sense_valid(&sshdr);
2207 if (sense_valid &&
2208 sshdr.sense_key == UNIT_ATTENTION &&
2209 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2210 /* Device reset might occur several times,
2211 * give it one more chance */
2212 if (--reset_retries > 0)
2213 continue;
2214 }
2215 retries--;
2216
2217 } while (the_result && retries);
2218
2219 if (the_result) {
2220 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2221 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2222 return -EINVAL;
2223 }
2224
2225 sector_size = get_unaligned_be32(&buffer[4]);
2226 lba = get_unaligned_be32(&buffer[0]);
2227
2228 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2229 /* Some buggy (usb cardreader) devices return an lba of
2230 0xffffffff when the want to report a size of 0 (with
2231 which they really mean no media is present) */
2232 sdkp->capacity = 0;
2233 sdkp->physical_block_size = sector_size;
2234 return sector_size;
2235 }
2236
2237 if (!sd_addressable_capacity(lba, sector_size)) {
2238 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2239 "kernel compiled with support for large block "
2240 "devices.\n");
2241 sdkp->capacity = 0;
2242 return -EOVERFLOW;
2243 }
2244
2245 sdkp->capacity = lba + 1;
2246 sdkp->physical_block_size = sector_size;
2247 return sector_size;
2248 }
2249
2250 static int sd_try_rc16_first(struct scsi_device *sdp)
2251 {
2252 if (sdp->host->max_cmd_len < 16)
2253 return 0;
2254 if (sdp->try_rc_10_first)
2255 return 0;
2256 if (sdp->scsi_level > SCSI_SPC_2)
2257 return 1;
2258 if (scsi_device_protection(sdp))
2259 return 1;
2260 return 0;
2261 }
2262
2263 /*
2264 * read disk capacity
2265 */
2266 static void
2267 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2268 {
2269 int sector_size;
2270 struct scsi_device *sdp = sdkp->device;
2271 sector_t old_capacity = sdkp->capacity;
2272
2273 if (sd_try_rc16_first(sdp)) {
2274 sector_size = read_capacity_16(sdkp, sdp, buffer);
2275 if (sector_size == -EOVERFLOW)
2276 goto got_data;
2277 if (sector_size == -ENODEV)
2278 return;
2279 if (sector_size < 0)
2280 sector_size = read_capacity_10(sdkp, sdp, buffer);
2281 if (sector_size < 0)
2282 return;
2283 } else {
2284 sector_size = read_capacity_10(sdkp, sdp, buffer);
2285 if (sector_size == -EOVERFLOW)
2286 goto got_data;
2287 if (sector_size < 0)
2288 return;
2289 if ((sizeof(sdkp->capacity) > 4) &&
2290 (sdkp->capacity > 0xffffffffULL)) {
2291 int old_sector_size = sector_size;
2292 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2293 "Trying to use READ CAPACITY(16).\n");
2294 sector_size = read_capacity_16(sdkp, sdp, buffer);
2295 if (sector_size < 0) {
2296 sd_printk(KERN_NOTICE, sdkp,
2297 "Using 0xffffffff as device size\n");
2298 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2299 sector_size = old_sector_size;
2300 goto got_data;
2301 }
2302 }
2303 }
2304
2305 /* Some devices are known to return the total number of blocks,
2306 * not the highest block number. Some devices have versions
2307 * which do this and others which do not. Some devices we might
2308 * suspect of doing this but we don't know for certain.
2309 *
2310 * If we know the reported capacity is wrong, decrement it. If
2311 * we can only guess, then assume the number of blocks is even
2312 * (usually true but not always) and err on the side of lowering
2313 * the capacity.
2314 */
2315 if (sdp->fix_capacity ||
2316 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2317 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2318 "from its reported value: %llu\n",
2319 (unsigned long long) sdkp->capacity);
2320 --sdkp->capacity;
2321 }
2322
2323 got_data:
2324 if (sector_size == 0) {
2325 sector_size = 512;
2326 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2327 "assuming 512.\n");
2328 }
2329
2330 if (sector_size != 512 &&
2331 sector_size != 1024 &&
2332 sector_size != 2048 &&
2333 sector_size != 4096) {
2334 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2335 sector_size);
2336 /*
2337 * The user might want to re-format the drive with
2338 * a supported sectorsize. Once this happens, it
2339 * would be relatively trivial to set the thing up.
2340 * For this reason, we leave the thing in the table.
2341 */
2342 sdkp->capacity = 0;
2343 /*
2344 * set a bogus sector size so the normal read/write
2345 * logic in the block layer will eventually refuse any
2346 * request on this device without tripping over power
2347 * of two sector size assumptions
2348 */
2349 sector_size = 512;
2350 }
2351 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2352
2353 {
2354 char cap_str_2[10], cap_str_10[10];
2355
2356 string_get_size(sdkp->capacity, sector_size,
2357 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2358 string_get_size(sdkp->capacity, sector_size,
2359 STRING_UNITS_10, cap_str_10,
2360 sizeof(cap_str_10));
2361
2362 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2363 sd_printk(KERN_NOTICE, sdkp,
2364 "%llu %d-byte logical blocks: (%s/%s)\n",
2365 (unsigned long long)sdkp->capacity,
2366 sector_size, cap_str_10, cap_str_2);
2367
2368 if (sdkp->physical_block_size != sector_size)
2369 sd_printk(KERN_NOTICE, sdkp,
2370 "%u-byte physical blocks\n",
2371 sdkp->physical_block_size);
2372 }
2373 }
2374
2375 if (sdkp->capacity > 0xffffffff)
2376 sdp->use_16_for_rw = 1;
2377
2378 blk_queue_physical_block_size(sdp->request_queue,
2379 sdkp->physical_block_size);
2380 sdkp->device->sector_size = sector_size;
2381 }
2382
2383 /* called with buffer of length 512 */
2384 static inline int
2385 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2386 unsigned char *buffer, int len, struct scsi_mode_data *data,
2387 struct scsi_sense_hdr *sshdr)
2388 {
2389 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2390 SD_TIMEOUT, SD_MAX_RETRIES, data,
2391 sshdr);
2392 }
2393
2394 /*
2395 * read write protect setting, if possible - called only in sd_revalidate_disk()
2396 * called with buffer of length SD_BUF_SIZE
2397 */
2398 static void
2399 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2400 {
2401 int res;
2402 struct scsi_device *sdp = sdkp->device;
2403 struct scsi_mode_data data;
2404 int disk_ro = get_disk_ro(sdkp->disk);
2405 int old_wp = sdkp->write_prot;
2406
2407 set_disk_ro(sdkp->disk, 0);
2408 if (sdp->skip_ms_page_3f) {
2409 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2410 return;
2411 }
2412
2413 if (sdp->use_192_bytes_for_3f) {
2414 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2415 } else {
2416 /*
2417 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2418 * We have to start carefully: some devices hang if we ask
2419 * for more than is available.
2420 */
2421 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2422
2423 /*
2424 * Second attempt: ask for page 0 When only page 0 is
2425 * implemented, a request for page 3F may return Sense Key
2426 * 5: Illegal Request, Sense Code 24: Invalid field in
2427 * CDB.
2428 */
2429 if (!scsi_status_is_good(res))
2430 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2431
2432 /*
2433 * Third attempt: ask 255 bytes, as we did earlier.
2434 */
2435 if (!scsi_status_is_good(res))
2436 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2437 &data, NULL);
2438 }
2439
2440 if (!scsi_status_is_good(res)) {
2441 sd_first_printk(KERN_WARNING, sdkp,
2442 "Test WP failed, assume Write Enabled\n");
2443 } else {
2444 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2445 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2446 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2447 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2448 sdkp->write_prot ? "on" : "off");
2449 sd_printk(KERN_DEBUG, sdkp,
2450 "Mode Sense: %02x %02x %02x %02x\n",
2451 buffer[0], buffer[1], buffer[2], buffer[3]);
2452 }
2453 }
2454 }
2455
2456 /*
2457 * sd_read_cache_type - called only from sd_revalidate_disk()
2458 * called with buffer of length SD_BUF_SIZE
2459 */
2460 static void
2461 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2462 {
2463 int len = 0, res;
2464 struct scsi_device *sdp = sdkp->device;
2465
2466 int dbd;
2467 int modepage;
2468 int first_len;
2469 struct scsi_mode_data data;
2470 struct scsi_sense_hdr sshdr;
2471 int old_wce = sdkp->WCE;
2472 int old_rcd = sdkp->RCD;
2473 int old_dpofua = sdkp->DPOFUA;
2474
2475
2476 if (sdkp->cache_override)
2477 return;
2478
2479 first_len = 4;
2480 if (sdp->skip_ms_page_8) {
2481 if (sdp->type == TYPE_RBC)
2482 goto defaults;
2483 else {
2484 if (sdp->skip_ms_page_3f)
2485 goto defaults;
2486 modepage = 0x3F;
2487 if (sdp->use_192_bytes_for_3f)
2488 first_len = 192;
2489 dbd = 0;
2490 }
2491 } else if (sdp->type == TYPE_RBC) {
2492 modepage = 6;
2493 dbd = 8;
2494 } else {
2495 modepage = 8;
2496 dbd = 0;
2497 }
2498
2499 /* cautiously ask */
2500 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2501 &data, &sshdr);
2502
2503 if (!scsi_status_is_good(res))
2504 goto bad_sense;
2505
2506 if (!data.header_length) {
2507 modepage = 6;
2508 first_len = 0;
2509 sd_first_printk(KERN_ERR, sdkp,
2510 "Missing header in MODE_SENSE response\n");
2511 }
2512
2513 /* that went OK, now ask for the proper length */
2514 len = data.length;
2515
2516 /*
2517 * We're only interested in the first three bytes, actually.
2518 * But the data cache page is defined for the first 20.
2519 */
2520 if (len < 3)
2521 goto bad_sense;
2522 else if (len > SD_BUF_SIZE) {
2523 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2524 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2525 len = SD_BUF_SIZE;
2526 }
2527 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2528 len = 192;
2529
2530 /* Get the data */
2531 if (len > first_len)
2532 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2533 &data, &sshdr);
2534
2535 if (scsi_status_is_good(res)) {
2536 int offset = data.header_length + data.block_descriptor_length;
2537
2538 while (offset < len) {
2539 u8 page_code = buffer[offset] & 0x3F;
2540 u8 spf = buffer[offset] & 0x40;
2541
2542 if (page_code == 8 || page_code == 6) {
2543 /* We're interested only in the first 3 bytes.
2544 */
2545 if (len - offset <= 2) {
2546 sd_first_printk(KERN_ERR, sdkp,
2547 "Incomplete mode parameter "
2548 "data\n");
2549 goto defaults;
2550 } else {
2551 modepage = page_code;
2552 goto Page_found;
2553 }
2554 } else {
2555 /* Go to the next page */
2556 if (spf && len - offset > 3)
2557 offset += 4 + (buffer[offset+2] << 8) +
2558 buffer[offset+3];
2559 else if (!spf && len - offset > 1)
2560 offset += 2 + buffer[offset+1];
2561 else {
2562 sd_first_printk(KERN_ERR, sdkp,
2563 "Incomplete mode "
2564 "parameter data\n");
2565 goto defaults;
2566 }
2567 }
2568 }
2569
2570 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2571 goto defaults;
2572
2573 Page_found:
2574 if (modepage == 8) {
2575 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2576 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2577 } else {
2578 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2579 sdkp->RCD = 0;
2580 }
2581
2582 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2583 if (sdp->broken_fua) {
2584 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2585 sdkp->DPOFUA = 0;
2586 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2587 !sdkp->device->use_16_for_rw) {
2588 sd_first_printk(KERN_NOTICE, sdkp,
2589 "Uses READ/WRITE(6), disabling FUA\n");
2590 sdkp->DPOFUA = 0;
2591 }
2592
2593 /* No cache flush allowed for write protected devices */
2594 if (sdkp->WCE && sdkp->write_prot)
2595 sdkp->WCE = 0;
2596
2597 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2598 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2599 sd_printk(KERN_NOTICE, sdkp,
2600 "Write cache: %s, read cache: %s, %s\n",
2601 sdkp->WCE ? "enabled" : "disabled",
2602 sdkp->RCD ? "disabled" : "enabled",
2603 sdkp->DPOFUA ? "supports DPO and FUA"
2604 : "doesn't support DPO or FUA");
2605
2606 return;
2607 }
2608
2609 bad_sense:
2610 if (scsi_sense_valid(&sshdr) &&
2611 sshdr.sense_key == ILLEGAL_REQUEST &&
2612 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2613 /* Invalid field in CDB */
2614 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2615 else
2616 sd_first_printk(KERN_ERR, sdkp,
2617 "Asking for cache data failed\n");
2618
2619 defaults:
2620 if (sdp->wce_default_on) {
2621 sd_first_printk(KERN_NOTICE, sdkp,
2622 "Assuming drive cache: write back\n");
2623 sdkp->WCE = 1;
2624 } else {
2625 sd_first_printk(KERN_ERR, sdkp,
2626 "Assuming drive cache: write through\n");
2627 sdkp->WCE = 0;
2628 }
2629 sdkp->RCD = 0;
2630 sdkp->DPOFUA = 0;
2631 }
2632
2633 /*
2634 * The ATO bit indicates whether the DIF application tag is available
2635 * for use by the operating system.
2636 */
2637 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2638 {
2639 int res, offset;
2640 struct scsi_device *sdp = sdkp->device;
2641 struct scsi_mode_data data;
2642 struct scsi_sense_hdr sshdr;
2643
2644 if (sdp->type != TYPE_DISK)
2645 return;
2646
2647 if (sdkp->protection_type == 0)
2648 return;
2649
2650 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2651 SD_MAX_RETRIES, &data, &sshdr);
2652
2653 if (!scsi_status_is_good(res) || !data.header_length ||
2654 data.length < 6) {
2655 sd_first_printk(KERN_WARNING, sdkp,
2656 "getting Control mode page failed, assume no ATO\n");
2657
2658 if (scsi_sense_valid(&sshdr))
2659 sd_print_sense_hdr(sdkp, &sshdr);
2660
2661 return;
2662 }
2663
2664 offset = data.header_length + data.block_descriptor_length;
2665
2666 if ((buffer[offset] & 0x3f) != 0x0a) {
2667 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2668 return;
2669 }
2670
2671 if ((buffer[offset + 5] & 0x80) == 0)
2672 return;
2673
2674 sdkp->ATO = 1;
2675
2676 return;
2677 }
2678
2679 /**
2680 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2681 * @disk: disk to query
2682 */
2683 static void sd_read_block_limits(struct scsi_disk *sdkp)
2684 {
2685 unsigned int sector_sz = sdkp->device->sector_size;
2686 const int vpd_len = 64;
2687 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2688
2689 if (!buffer ||
2690 /* Block Limits VPD */
2691 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2692 goto out;
2693
2694 blk_queue_io_min(sdkp->disk->queue,
2695 get_unaligned_be16(&buffer[6]) * sector_sz);
2696
2697 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2698 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2699
2700 if (buffer[3] == 0x3c) {
2701 unsigned int lba_count, desc_count;
2702
2703 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2704
2705 if (!sdkp->lbpme)
2706 goto out;
2707
2708 lba_count = get_unaligned_be32(&buffer[20]);
2709 desc_count = get_unaligned_be32(&buffer[24]);
2710
2711 if (lba_count && desc_count)
2712 sdkp->max_unmap_blocks = lba_count;
2713
2714 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2715
2716 if (buffer[32] & 0x80)
2717 sdkp->unmap_alignment =
2718 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2719
2720 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2721
2722 if (sdkp->max_unmap_blocks)
2723 sd_config_discard(sdkp, SD_LBP_UNMAP);
2724 else
2725 sd_config_discard(sdkp, SD_LBP_WS16);
2726
2727 } else { /* LBP VPD page tells us what to use */
2728 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2729 sd_config_discard(sdkp, SD_LBP_UNMAP);
2730 else if (sdkp->lbpws)
2731 sd_config_discard(sdkp, SD_LBP_WS16);
2732 else if (sdkp->lbpws10)
2733 sd_config_discard(sdkp, SD_LBP_WS10);
2734 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2735 sd_config_discard(sdkp, SD_LBP_UNMAP);
2736 else
2737 sd_config_discard(sdkp, SD_LBP_DISABLE);
2738 }
2739 }
2740
2741 out:
2742 kfree(buffer);
2743 }
2744
2745 /**
2746 * sd_read_block_characteristics - Query block dev. characteristics
2747 * @disk: disk to query
2748 */
2749 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2750 {
2751 unsigned char *buffer;
2752 u16 rot;
2753 const int vpd_len = 64;
2754
2755 buffer = kmalloc(vpd_len, GFP_KERNEL);
2756
2757 if (!buffer ||
2758 /* Block Device Characteristics VPD */
2759 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2760 goto out;
2761
2762 rot = get_unaligned_be16(&buffer[4]);
2763
2764 if (rot == 1) {
2765 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2766 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2767 }
2768
2769 out:
2770 kfree(buffer);
2771 }
2772
2773 /**
2774 * sd_read_block_provisioning - Query provisioning VPD page
2775 * @disk: disk to query
2776 */
2777 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2778 {
2779 unsigned char *buffer;
2780 const int vpd_len = 8;
2781
2782 if (sdkp->lbpme == 0)
2783 return;
2784
2785 buffer = kmalloc(vpd_len, GFP_KERNEL);
2786
2787 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2788 goto out;
2789
2790 sdkp->lbpvpd = 1;
2791 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2792 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2793 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2794
2795 out:
2796 kfree(buffer);
2797 }
2798
2799 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2800 {
2801 struct scsi_device *sdev = sdkp->device;
2802
2803 if (sdev->host->no_write_same) {
2804 sdev->no_write_same = 1;
2805
2806 return;
2807 }
2808
2809 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2810 /* too large values might cause issues with arcmsr */
2811 int vpd_buf_len = 64;
2812
2813 sdev->no_report_opcodes = 1;
2814
2815 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2816 * CODES is unsupported and the device has an ATA
2817 * Information VPD page (SAT).
2818 */
2819 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2820 sdev->no_write_same = 1;
2821 }
2822
2823 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2824 sdkp->ws16 = 1;
2825
2826 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2827 sdkp->ws10 = 1;
2828 }
2829
2830 /**
2831 * sd_revalidate_disk - called the first time a new disk is seen,
2832 * performs disk spin up, read_capacity, etc.
2833 * @disk: struct gendisk we care about
2834 **/
2835 static int sd_revalidate_disk(struct gendisk *disk)
2836 {
2837 struct scsi_disk *sdkp = scsi_disk(disk);
2838 struct scsi_device *sdp = sdkp->device;
2839 struct request_queue *q = sdkp->disk->queue;
2840 unsigned char *buffer;
2841 unsigned int dev_max, rw_max;
2842
2843 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2844 "sd_revalidate_disk\n"));
2845
2846 /*
2847 * If the device is offline, don't try and read capacity or any
2848 * of the other niceties.
2849 */
2850 if (!scsi_device_online(sdp))
2851 goto out;
2852
2853 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2854 if (!buffer) {
2855 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2856 "allocation failure.\n");
2857 goto out;
2858 }
2859
2860 sd_spinup_disk(sdkp);
2861
2862 /*
2863 * Without media there is no reason to ask; moreover, some devices
2864 * react badly if we do.
2865 */
2866 if (sdkp->media_present) {
2867 sd_read_capacity(sdkp, buffer);
2868
2869 if (scsi_device_supports_vpd(sdp)) {
2870 sd_read_block_provisioning(sdkp);
2871 sd_read_block_limits(sdkp);
2872 sd_read_block_characteristics(sdkp);
2873 }
2874
2875 sd_read_write_protect_flag(sdkp, buffer);
2876 sd_read_cache_type(sdkp, buffer);
2877 sd_read_app_tag_own(sdkp, buffer);
2878 sd_read_write_same(sdkp, buffer);
2879 }
2880
2881 /*
2882 * We now have all cache related info, determine how we deal
2883 * with flush requests.
2884 */
2885 sd_set_flush_flag(sdkp);
2886
2887 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2888 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2889
2890 /* Some devices report a maximum block count for READ/WRITE requests. */
2891 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2892 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2893
2894 /*
2895 * Determine the device's preferred I/O size for reads and writes
2896 * unless the reported value is unreasonably small, large, or
2897 * garbage.
2898 */
2899 if (sdkp->opt_xfer_blocks &&
2900 sdkp->opt_xfer_blocks <= dev_max &&
2901 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2902 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2903 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2904 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2905 } else
2906 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
2907 (sector_t)BLK_DEF_MAX_SECTORS);
2908
2909 /* Do not exceed controller limit */
2910 rw_max = min(rw_max, queue_max_hw_sectors(q));
2911
2912 /*
2913 * Only update max_sectors if previously unset or if the current value
2914 * exceeds the capabilities of the hardware.
2915 */
2916 if (sdkp->first_scan ||
2917 q->limits.max_sectors > q->limits.max_dev_sectors ||
2918 q->limits.max_sectors > q->limits.max_hw_sectors)
2919 q->limits.max_sectors = rw_max;
2920
2921 sdkp->first_scan = 0;
2922
2923 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2924 sd_config_write_same(sdkp);
2925 kfree(buffer);
2926
2927 out:
2928 return 0;
2929 }
2930
2931 /**
2932 * sd_unlock_native_capacity - unlock native capacity
2933 * @disk: struct gendisk to set capacity for
2934 *
2935 * Block layer calls this function if it detects that partitions
2936 * on @disk reach beyond the end of the device. If the SCSI host
2937 * implements ->unlock_native_capacity() method, it's invoked to
2938 * give it a chance to adjust the device capacity.
2939 *
2940 * CONTEXT:
2941 * Defined by block layer. Might sleep.
2942 */
2943 static void sd_unlock_native_capacity(struct gendisk *disk)
2944 {
2945 struct scsi_device *sdev = scsi_disk(disk)->device;
2946
2947 if (sdev->host->hostt->unlock_native_capacity)
2948 sdev->host->hostt->unlock_native_capacity(sdev);
2949 }
2950
2951 /**
2952 * sd_format_disk_name - format disk name
2953 * @prefix: name prefix - ie. "sd" for SCSI disks
2954 * @index: index of the disk to format name for
2955 * @buf: output buffer
2956 * @buflen: length of the output buffer
2957 *
2958 * SCSI disk names starts at sda. The 26th device is sdz and the
2959 * 27th is sdaa. The last one for two lettered suffix is sdzz
2960 * which is followed by sdaaa.
2961 *
2962 * This is basically 26 base counting with one extra 'nil' entry
2963 * at the beginning from the second digit on and can be
2964 * determined using similar method as 26 base conversion with the
2965 * index shifted -1 after each digit is computed.
2966 *
2967 * CONTEXT:
2968 * Don't care.
2969 *
2970 * RETURNS:
2971 * 0 on success, -errno on failure.
2972 */
2973 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2974 {
2975 const int base = 'z' - 'a' + 1;
2976 char *begin = buf + strlen(prefix);
2977 char *end = buf + buflen;
2978 char *p;
2979 int unit;
2980
2981 p = end - 1;
2982 *p = '\0';
2983 unit = base;
2984 do {
2985 if (p == begin)
2986 return -EINVAL;
2987 *--p = 'a' + (index % unit);
2988 index = (index / unit) - 1;
2989 } while (index >= 0);
2990
2991 memmove(begin, p, end - p);
2992 memcpy(buf, prefix, strlen(prefix));
2993
2994 return 0;
2995 }
2996
2997 /*
2998 * The asynchronous part of sd_probe
2999 */
3000 static void sd_probe_async(void *data, async_cookie_t cookie)
3001 {
3002 struct scsi_disk *sdkp = data;
3003 struct scsi_device *sdp;
3004 struct gendisk *gd;
3005 u32 index;
3006 struct device *dev;
3007
3008 sdp = sdkp->device;
3009 gd = sdkp->disk;
3010 index = sdkp->index;
3011 dev = &sdp->sdev_gendev;
3012
3013 gd->major = sd_major((index & 0xf0) >> 4);
3014 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3015 gd->minors = SD_MINORS;
3016
3017 gd->fops = &sd_fops;
3018 gd->private_data = &sdkp->driver;
3019 gd->queue = sdkp->device->request_queue;
3020
3021 /* defaults, until the device tells us otherwise */
3022 sdp->sector_size = 512;
3023 sdkp->capacity = 0;
3024 sdkp->media_present = 1;
3025 sdkp->write_prot = 0;
3026 sdkp->cache_override = 0;
3027 sdkp->WCE = 0;
3028 sdkp->RCD = 0;
3029 sdkp->ATO = 0;
3030 sdkp->first_scan = 1;
3031 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3032
3033 sd_revalidate_disk(gd);
3034
3035 gd->flags = GENHD_FL_EXT_DEVT;
3036 if (sdp->removable) {
3037 gd->flags |= GENHD_FL_REMOVABLE;
3038 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3039 }
3040
3041 blk_pm_runtime_init(sdp->request_queue, dev);
3042 device_add_disk(dev, gd);
3043 if (sdkp->capacity)
3044 sd_dif_config_host(sdkp);
3045
3046 sd_revalidate_disk(gd);
3047
3048 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3049 sdp->removable ? "removable " : "");
3050 scsi_autopm_put_device(sdp);
3051 put_device(&sdkp->dev);
3052 }
3053
3054 /**
3055 * sd_probe - called during driver initialization and whenever a
3056 * new scsi device is attached to the system. It is called once
3057 * for each scsi device (not just disks) present.
3058 * @dev: pointer to device object
3059 *
3060 * Returns 0 if successful (or not interested in this scsi device
3061 * (e.g. scanner)); 1 when there is an error.
3062 *
3063 * Note: this function is invoked from the scsi mid-level.
3064 * This function sets up the mapping between a given
3065 * <host,channel,id,lun> (found in sdp) and new device name
3066 * (e.g. /dev/sda). More precisely it is the block device major
3067 * and minor number that is chosen here.
3068 *
3069 * Assume sd_probe is not re-entrant (for time being)
3070 * Also think about sd_probe() and sd_remove() running coincidentally.
3071 **/
3072 static int sd_probe(struct device *dev)
3073 {
3074 struct scsi_device *sdp = to_scsi_device(dev);
3075 struct scsi_disk *sdkp;
3076 struct gendisk *gd;
3077 int index;
3078 int error;
3079
3080 scsi_autopm_get_device(sdp);
3081 error = -ENODEV;
3082 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3083 goto out;
3084
3085 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3086 "sd_probe\n"));
3087
3088 error = -ENOMEM;
3089 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3090 if (!sdkp)
3091 goto out;
3092
3093 gd = alloc_disk(SD_MINORS);
3094 if (!gd)
3095 goto out_free;
3096
3097 do {
3098 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3099 goto out_put;
3100
3101 spin_lock(&sd_index_lock);
3102 error = ida_get_new(&sd_index_ida, &index);
3103 spin_unlock(&sd_index_lock);
3104 } while (error == -EAGAIN);
3105
3106 if (error) {
3107 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3108 goto out_put;
3109 }
3110
3111 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3112 if (error) {
3113 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3114 goto out_free_index;
3115 }
3116
3117 sdkp->device = sdp;
3118 sdkp->driver = &sd_template;
3119 sdkp->disk = gd;
3120 sdkp->index = index;
3121 atomic_set(&sdkp->openers, 0);
3122 atomic_set(&sdkp->device->ioerr_cnt, 0);
3123
3124 if (!sdp->request_queue->rq_timeout) {
3125 if (sdp->type != TYPE_MOD)
3126 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3127 else
3128 blk_queue_rq_timeout(sdp->request_queue,
3129 SD_MOD_TIMEOUT);
3130 }
3131
3132 device_initialize(&sdkp->dev);
3133 sdkp->dev.parent = dev;
3134 sdkp->dev.class = &sd_disk_class;
3135 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3136
3137 error = device_add(&sdkp->dev);
3138 if (error)
3139 goto out_free_index;
3140
3141 get_device(dev);
3142 dev_set_drvdata(dev, sdkp);
3143
3144 get_device(&sdkp->dev); /* prevent release before async_schedule */
3145 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3146
3147 return 0;
3148
3149 out_free_index:
3150 spin_lock(&sd_index_lock);
3151 ida_remove(&sd_index_ida, index);
3152 spin_unlock(&sd_index_lock);
3153 out_put:
3154 put_disk(gd);
3155 out_free:
3156 kfree(sdkp);
3157 out:
3158 scsi_autopm_put_device(sdp);
3159 return error;
3160 }
3161
3162 /**
3163 * sd_remove - called whenever a scsi disk (previously recognized by
3164 * sd_probe) is detached from the system. It is called (potentially
3165 * multiple times) during sd module unload.
3166 * @sdp: pointer to mid level scsi device object
3167 *
3168 * Note: this function is invoked from the scsi mid-level.
3169 * This function potentially frees up a device name (e.g. /dev/sdc)
3170 * that could be re-used by a subsequent sd_probe().
3171 * This function is not called when the built-in sd driver is "exit-ed".
3172 **/
3173 static int sd_remove(struct device *dev)
3174 {
3175 struct scsi_disk *sdkp;
3176 dev_t devt;
3177
3178 sdkp = dev_get_drvdata(dev);
3179 devt = disk_devt(sdkp->disk);
3180 scsi_autopm_get_device(sdkp->device);
3181
3182 async_synchronize_full_domain(&scsi_sd_pm_domain);
3183 async_synchronize_full_domain(&scsi_sd_probe_domain);
3184 device_del(&sdkp->dev);
3185 del_gendisk(sdkp->disk);
3186 sd_shutdown(dev);
3187
3188 blk_register_region(devt, SD_MINORS, NULL,
3189 sd_default_probe, NULL, NULL);
3190
3191 mutex_lock(&sd_ref_mutex);
3192 dev_set_drvdata(dev, NULL);
3193 put_device(&sdkp->dev);
3194 mutex_unlock(&sd_ref_mutex);
3195
3196 return 0;
3197 }
3198
3199 /**
3200 * scsi_disk_release - Called to free the scsi_disk structure
3201 * @dev: pointer to embedded class device
3202 *
3203 * sd_ref_mutex must be held entering this routine. Because it is
3204 * called on last put, you should always use the scsi_disk_get()
3205 * scsi_disk_put() helpers which manipulate the semaphore directly
3206 * and never do a direct put_device.
3207 **/
3208 static void scsi_disk_release(struct device *dev)
3209 {
3210 struct scsi_disk *sdkp = to_scsi_disk(dev);
3211 struct gendisk *disk = sdkp->disk;
3212
3213 spin_lock(&sd_index_lock);
3214 ida_remove(&sd_index_ida, sdkp->index);
3215 spin_unlock(&sd_index_lock);
3216
3217 disk->private_data = NULL;
3218 put_disk(disk);
3219 put_device(&sdkp->device->sdev_gendev);
3220
3221 kfree(sdkp);
3222 }
3223
3224 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3225 {
3226 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3227 struct scsi_sense_hdr sshdr;
3228 struct scsi_device *sdp = sdkp->device;
3229 int res;
3230
3231 if (start)
3232 cmd[4] |= 1; /* START */
3233
3234 if (sdp->start_stop_pwr_cond)
3235 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3236
3237 if (!scsi_device_online(sdp))
3238 return -ENODEV;
3239
3240 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3241 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3242 if (res) {
3243 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3244 if (driver_byte(res) & DRIVER_SENSE)
3245 sd_print_sense_hdr(sdkp, &sshdr);
3246 if (scsi_sense_valid(&sshdr) &&
3247 /* 0x3a is medium not present */
3248 sshdr.asc == 0x3a)
3249 res = 0;
3250 }
3251
3252 /* SCSI error codes must not go to the generic layer */
3253 if (res)
3254 return -EIO;
3255
3256 return 0;
3257 }
3258
3259 /*
3260 * Send a SYNCHRONIZE CACHE instruction down to the device through
3261 * the normal SCSI command structure. Wait for the command to
3262 * complete.
3263 */
3264 static void sd_shutdown(struct device *dev)
3265 {
3266 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3267
3268 if (!sdkp)
3269 return; /* this can happen */
3270
3271 if (pm_runtime_suspended(dev))
3272 return;
3273
3274 if (sdkp->WCE && sdkp->media_present) {
3275 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3276 sd_sync_cache(sdkp);
3277 }
3278
3279 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3280 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3281 sd_start_stop_device(sdkp, 0);
3282 }
3283 }
3284
3285 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3286 {
3287 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3288 int ret = 0;
3289
3290 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3291 return 0;
3292
3293 if (sdkp->WCE && sdkp->media_present) {
3294 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3295 ret = sd_sync_cache(sdkp);
3296 if (ret) {
3297 /* ignore OFFLINE device */
3298 if (ret == -ENODEV)
3299 ret = 0;
3300 goto done;
3301 }
3302 }
3303
3304 if (sdkp->device->manage_start_stop) {
3305 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3306 /* an error is not worth aborting a system sleep */
3307 ret = sd_start_stop_device(sdkp, 0);
3308 if (ignore_stop_errors)
3309 ret = 0;
3310 }
3311
3312 done:
3313 return ret;
3314 }
3315
3316 static int sd_suspend_system(struct device *dev)
3317 {
3318 return sd_suspend_common(dev, true);
3319 }
3320
3321 static int sd_suspend_runtime(struct device *dev)
3322 {
3323 return sd_suspend_common(dev, false);
3324 }
3325
3326 static int sd_resume(struct device *dev)
3327 {
3328 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3329
3330 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3331 return 0;
3332
3333 if (!sdkp->device->manage_start_stop)
3334 return 0;
3335
3336 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3337 return sd_start_stop_device(sdkp, 1);
3338 }
3339
3340 /**
3341 * init_sd - entry point for this driver (both when built in or when
3342 * a module).
3343 *
3344 * Note: this function registers this driver with the scsi mid-level.
3345 **/
3346 static int __init init_sd(void)
3347 {
3348 int majors = 0, i, err;
3349
3350 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3351
3352 for (i = 0; i < SD_MAJORS; i++) {
3353 if (register_blkdev(sd_major(i), "sd") != 0)
3354 continue;
3355 majors++;
3356 blk_register_region(sd_major(i), SD_MINORS, NULL,
3357 sd_default_probe, NULL, NULL);
3358 }
3359
3360 if (!majors)
3361 return -ENODEV;
3362
3363 err = class_register(&sd_disk_class);
3364 if (err)
3365 goto err_out;
3366
3367 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3368 0, 0, NULL);
3369 if (!sd_cdb_cache) {
3370 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3371 err = -ENOMEM;
3372 goto err_out_class;
3373 }
3374
3375 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3376 if (!sd_cdb_pool) {
3377 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3378 err = -ENOMEM;
3379 goto err_out_cache;
3380 }
3381
3382 err = scsi_register_driver(&sd_template.gendrv);
3383 if (err)
3384 goto err_out_driver;
3385
3386 return 0;
3387
3388 err_out_driver:
3389 mempool_destroy(sd_cdb_pool);
3390
3391 err_out_cache:
3392 kmem_cache_destroy(sd_cdb_cache);
3393
3394 err_out_class:
3395 class_unregister(&sd_disk_class);
3396 err_out:
3397 for (i = 0; i < SD_MAJORS; i++)
3398 unregister_blkdev(sd_major(i), "sd");
3399 return err;
3400 }
3401
3402 /**
3403 * exit_sd - exit point for this driver (when it is a module).
3404 *
3405 * Note: this function unregisters this driver from the scsi mid-level.
3406 **/
3407 static void __exit exit_sd(void)
3408 {
3409 int i;
3410
3411 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3412
3413 scsi_unregister_driver(&sd_template.gendrv);
3414 mempool_destroy(sd_cdb_pool);
3415 kmem_cache_destroy(sd_cdb_cache);
3416
3417 class_unregister(&sd_disk_class);
3418
3419 for (i = 0; i < SD_MAJORS; i++) {
3420 blk_unregister_region(sd_major(i), SD_MINORS);
3421 unregister_blkdev(sd_major(i), "sd");
3422 }
3423 }
3424
3425 module_init(init_sd);
3426 module_exit(exit_sd);
3427
3428 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3429 struct scsi_sense_hdr *sshdr)
3430 {
3431 scsi_print_sense_hdr(sdkp->device,
3432 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3433 }
3434
3435 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3436 int result)
3437 {
3438 const char *hb_string = scsi_hostbyte_string(result);
3439 const char *db_string = scsi_driverbyte_string(result);
3440
3441 if (hb_string || db_string)
3442 sd_printk(KERN_INFO, sdkp,
3443 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3444 hb_string ? hb_string : "invalid",
3445 db_string ? db_string : "invalid");
3446 else
3447 sd_printk(KERN_INFO, sdkp,
3448 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3449 msg, host_byte(result), driver_byte(result));
3450 }
3451
Linux with added FPC-III support