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1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/genhd.h>
41#include <linux/hdreg.h>
42#include <linux/errno.h>
43#include <linux/idr.h>
44#include <linux/interrupt.h>
45#include <linux/init.h>
46#include <linux/blkdev.h>
47#include <linux/blkpg.h>
48#include <linux/delay.h>
49#include <linux/mutex.h>
50#include <linux/string_helpers.h>
51#include <linux/async.h>
52#include <linux/slab.h>
53#include <linux/pm_runtime.h>
54#include <linux/pr.h>
55#include <asm/uaccess.h>
56#include <asm/unaligned.h>
57
58#include <scsi/scsi.h>
59#include <scsi/scsi_cmnd.h>
60#include <scsi/scsi_dbg.h>
61#include <scsi/scsi_device.h>
62#include <scsi/scsi_driver.h>
63#include <scsi/scsi_eh.h>
64#include <scsi/scsi_host.h>
65#include <scsi/scsi_ioctl.h>
66#include <scsi/scsicam.h>
67
68#include "sd.h"
69#include "scsi_priv.h"
70#include "scsi_logging.h"
71
72MODULE_AUTHOR("Eric Youngdale");
73MODULE_DESCRIPTION("SCSI disk (sd) driver");
74MODULE_LICENSE("GPL");
75
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
95
96#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
97#define SD_MINORS 16
98#else
99#define SD_MINORS 0
100#endif
101
102static void sd_config_discard(struct scsi_disk *, unsigned int);
103static void sd_config_write_same(struct scsi_disk *);
104static int sd_revalidate_disk(struct gendisk *);
105static void sd_unlock_native_capacity(struct gendisk *disk);
106static int sd_probe(struct device *);
107static int sd_remove(struct device *);
108static void sd_shutdown(struct device *);
109static int sd_suspend_system(struct device *);
110static int sd_suspend_runtime(struct device *);
111static int sd_resume(struct device *);
112static void sd_rescan(struct device *);
113static int sd_init_command(struct scsi_cmnd *SCpnt);
114static void sd_uninit_command(struct scsi_cmnd *SCpnt);
115static int sd_done(struct scsi_cmnd *);
116static int sd_eh_action(struct scsi_cmnd *, int);
117static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
118static void scsi_disk_release(struct device *cdev);
119static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
120static void sd_print_result(const struct scsi_disk *, const char *, int);
121
122static DEFINE_SPINLOCK(sd_index_lock);
123static DEFINE_IDA(sd_index_ida);
124
125/* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
128static DEFINE_MUTEX(sd_ref_mutex);
129
130static struct kmem_cache *sd_cdb_cache;
131static mempool_t *sd_cdb_pool;
132
133static const char *sd_cache_types[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
136};
137
138static void sd_set_flush_flag(struct scsi_disk *sdkp)
139{
140 unsigned flush = 0;
141
142 if (sdkp->WCE) {
143 flush |= REQ_FLUSH;
144 if (sdkp->DPOFUA)
145 flush |= REQ_FUA;
146 }
147
148 blk_queue_flush(sdkp->disk->queue, flush);
149}
150
151static ssize_t
152cache_type_store(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
154{
155 int i, ct = -1, rcd, wce, sp;
156 struct scsi_disk *sdkp = to_scsi_disk(dev);
157 struct scsi_device *sdp = sdkp->device;
158 char buffer[64];
159 char *buffer_data;
160 struct scsi_mode_data data;
161 struct scsi_sense_hdr sshdr;
162 static const char temp[] = "temporary ";
163 int len;
164
165 if (sdp->type != TYPE_DISK)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
169 return -EINVAL;
170
171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
172 buf += sizeof(temp) - 1;
173 sdkp->cache_override = 1;
174 } else {
175 sdkp->cache_override = 0;
176 }
177
178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
179 len = strlen(sd_cache_types[i]);
180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
181 buf[len] == '\n') {
182 ct = i;
183 break;
184 }
185 }
186 if (ct < 0)
187 return -EINVAL;
188 rcd = ct & 0x01 ? 1 : 0;
189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
190
191 if (sdkp->cache_override) {
192 sdkp->WCE = wce;
193 sdkp->RCD = rcd;
194 sd_set_flush_flag(sdkp);
195 return count;
196 }
197
198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199 SD_MAX_RETRIES, &data, NULL))
200 return -EINVAL;
201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
202 data.block_descriptor_length);
203 buffer_data = buffer + data.header_length +
204 data.block_descriptor_length;
205 buffer_data[2] &= ~0x05;
206 buffer_data[2] |= wce << 2 | rcd;
207 sp = buffer_data[0] & 0x80 ? 1 : 0;
208 buffer_data[0] &= ~0x80;
209
210 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
211 SD_MAX_RETRIES, &data, &sshdr)) {
212 if (scsi_sense_valid(&sshdr))
213 sd_print_sense_hdr(sdkp, &sshdr);
214 return -EINVAL;
215 }
216 revalidate_disk(sdkp->disk);
217 return count;
218}
219
220static ssize_t
221manage_start_stop_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
226
227 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
228}
229
230static ssize_t
231manage_start_stop_store(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233{
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 struct scsi_device *sdp = sdkp->device;
236
237 if (!capable(CAP_SYS_ADMIN))
238 return -EACCES;
239
240 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
241
242 return count;
243}
244static DEVICE_ATTR_RW(manage_start_stop);
245
246static ssize_t
247allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
248{
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
250
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252}
253
254static ssize_t
255allow_restart_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
257{
258 struct scsi_disk *sdkp = to_scsi_disk(dev);
259 struct scsi_device *sdp = sdkp->device;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EACCES;
263
264 if (sdp->type != TYPE_DISK)
265 return -EINVAL;
266
267 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
268
269 return count;
270}
271static DEVICE_ATTR_RW(allow_restart);
272
273static ssize_t
274cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
275{
276 struct scsi_disk *sdkp = to_scsi_disk(dev);
277 int ct = sdkp->RCD + 2*sdkp->WCE;
278
279 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
280}
281static DEVICE_ATTR_RW(cache_type);
282
283static ssize_t
284FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
285{
286 struct scsi_disk *sdkp = to_scsi_disk(dev);
287
288 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
289}
290static DEVICE_ATTR_RO(FUA);
291
292static ssize_t
293protection_type_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
299}
300
301static ssize_t
302protection_type_store(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count)
304{
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
306 unsigned int val;
307 int err;
308
309 if (!capable(CAP_SYS_ADMIN))
310 return -EACCES;
311
312 err = kstrtouint(buf, 10, &val);
313
314 if (err)
315 return err;
316
317 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
318 sdkp->protection_type = val;
319
320 return count;
321}
322static DEVICE_ATTR_RW(protection_type);
323
324static ssize_t
325protection_mode_show(struct device *dev, struct device_attribute *attr,
326 char *buf)
327{
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329 struct scsi_device *sdp = sdkp->device;
330 unsigned int dif, dix;
331
332 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
333 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
334
335 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
336 dif = 0;
337 dix = 1;
338 }
339
340 if (!dif && !dix)
341 return snprintf(buf, 20, "none\n");
342
343 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
344}
345static DEVICE_ATTR_RO(protection_mode);
346
347static ssize_t
348app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
349{
350 struct scsi_disk *sdkp = to_scsi_disk(dev);
351
352 return snprintf(buf, 20, "%u\n", sdkp->ATO);
353}
354static DEVICE_ATTR_RO(app_tag_own);
355
356static ssize_t
357thin_provisioning_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
359{
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
361
362 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
363}
364static DEVICE_ATTR_RO(thin_provisioning);
365
366static const char *lbp_mode[] = {
367 [SD_LBP_FULL] = "full",
368 [SD_LBP_UNMAP] = "unmap",
369 [SD_LBP_WS16] = "writesame_16",
370 [SD_LBP_WS10] = "writesame_10",
371 [SD_LBP_ZERO] = "writesame_zero",
372 [SD_LBP_DISABLE] = "disabled",
373};
374
375static ssize_t
376provisioning_mode_show(struct device *dev, struct device_attribute *attr,
377 char *buf)
378{
379 struct scsi_disk *sdkp = to_scsi_disk(dev);
380
381 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
382}
383
384static ssize_t
385provisioning_mode_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
387{
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 struct scsi_device *sdp = sdkp->device;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 if (sdp->type != TYPE_DISK)
395 return -EINVAL;
396
397 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
398 sd_config_discard(sdkp, SD_LBP_UNMAP);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
400 sd_config_discard(sdkp, SD_LBP_WS16);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
402 sd_config_discard(sdkp, SD_LBP_WS10);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
404 sd_config_discard(sdkp, SD_LBP_ZERO);
405 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
406 sd_config_discard(sdkp, SD_LBP_DISABLE);
407 else
408 return -EINVAL;
409
410 return count;
411}
412static DEVICE_ATTR_RW(provisioning_mode);
413
414static ssize_t
415max_medium_access_timeouts_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
421}
422
423static ssize_t
424max_medium_access_timeouts_store(struct device *dev,
425 struct device_attribute *attr, const char *buf,
426 size_t count)
427{
428 struct scsi_disk *sdkp = to_scsi_disk(dev);
429 int err;
430
431 if (!capable(CAP_SYS_ADMIN))
432 return -EACCES;
433
434 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
435
436 return err ? err : count;
437}
438static DEVICE_ATTR_RW(max_medium_access_timeouts);
439
440static ssize_t
441max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
442 char *buf)
443{
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
445
446 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
447}
448
449static ssize_t
450max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
452{
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454 struct scsi_device *sdp = sdkp->device;
455 unsigned long max;
456 int err;
457
458 if (!capable(CAP_SYS_ADMIN))
459 return -EACCES;
460
461 if (sdp->type != TYPE_DISK)
462 return -EINVAL;
463
464 err = kstrtoul(buf, 10, &max);
465
466 if (err)
467 return err;
468
469 if (max == 0)
470 sdp->no_write_same = 1;
471 else if (max <= SD_MAX_WS16_BLOCKS) {
472 sdp->no_write_same = 0;
473 sdkp->max_ws_blocks = max;
474 }
475
476 sd_config_write_same(sdkp);
477
478 return count;
479}
480static DEVICE_ATTR_RW(max_write_same_blocks);
481
482static struct attribute *sd_disk_attrs[] = {
483 &dev_attr_cache_type.attr,
484 &dev_attr_FUA.attr,
485 &dev_attr_allow_restart.attr,
486 &dev_attr_manage_start_stop.attr,
487 &dev_attr_protection_type.attr,
488 &dev_attr_protection_mode.attr,
489 &dev_attr_app_tag_own.attr,
490 &dev_attr_thin_provisioning.attr,
491 &dev_attr_provisioning_mode.attr,
492 &dev_attr_max_write_same_blocks.attr,
493 &dev_attr_max_medium_access_timeouts.attr,
494 NULL,
495};
496ATTRIBUTE_GROUPS(sd_disk);
497
498static struct class sd_disk_class = {
499 .name = "scsi_disk",
500 .owner = THIS_MODULE,
501 .dev_release = scsi_disk_release,
502 .dev_groups = sd_disk_groups,
503};
504
505static const struct dev_pm_ops sd_pm_ops = {
506 .suspend = sd_suspend_system,
507 .resume = sd_resume,
508 .poweroff = sd_suspend_system,
509 .restore = sd_resume,
510 .runtime_suspend = sd_suspend_runtime,
511 .runtime_resume = sd_resume,
512};
513
514static struct scsi_driver sd_template = {
515 .gendrv = {
516 .name = "sd",
517 .owner = THIS_MODULE,
518 .probe = sd_probe,
519 .remove = sd_remove,
520 .shutdown = sd_shutdown,
521 .pm = &sd_pm_ops,
522 },
523 .rescan = sd_rescan,
524 .init_command = sd_init_command,
525 .uninit_command = sd_uninit_command,
526 .done = sd_done,
527 .eh_action = sd_eh_action,
528};
529
530/*
531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
534 */
535static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
536{
537 return NULL;
538}
539
540/*
541 * Device no to disk mapping:
542 *
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
545 * 31 20 19 8 7 4 3 0
546 *
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
550 * for major1, ...
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
553 */
554static int sd_major(int major_idx)
555{
556 switch (major_idx) {
557 case 0:
558 return SCSI_DISK0_MAJOR;
559 case 1 ... 7:
560 return SCSI_DISK1_MAJOR + major_idx - 1;
561 case 8 ... 15:
562 return SCSI_DISK8_MAJOR + major_idx - 8;
563 default:
564 BUG();
565 return 0; /* shut up gcc */
566 }
567}
568
569static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
570{
571 struct scsi_disk *sdkp = NULL;
572
573 mutex_lock(&sd_ref_mutex);
574
575 if (disk->private_data) {
576 sdkp = scsi_disk(disk);
577 if (scsi_device_get(sdkp->device) == 0)
578 get_device(&sdkp->dev);
579 else
580 sdkp = NULL;
581 }
582 mutex_unlock(&sd_ref_mutex);
583 return sdkp;
584}
585
586static void scsi_disk_put(struct scsi_disk *sdkp)
587{
588 struct scsi_device *sdev = sdkp->device;
589
590 mutex_lock(&sd_ref_mutex);
591 put_device(&sdkp->dev);
592 scsi_device_put(sdev);
593 mutex_unlock(&sd_ref_mutex);
594}
595
596static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
597 unsigned int dix, unsigned int dif)
598{
599 struct bio *bio = scmd->request->bio;
600 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
601 unsigned int protect = 0;
602
603 if (dix) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
605 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
606
607 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
608 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
609 }
610
611 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
612 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
613
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
616 }
617
618 if (dif) { /* DIX/DIF Type 1, 2, 3 */
619 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
620
621 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
622 protect = 3 << 5; /* Disable target PI checking */
623 else
624 protect = 1 << 5; /* Enable target PI checking */
625 }
626
627 scsi_set_prot_op(scmd, prot_op);
628 scsi_set_prot_type(scmd, dif);
629 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
630
631 return protect;
632}
633
634static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
635{
636 struct request_queue *q = sdkp->disk->queue;
637 unsigned int logical_block_size = sdkp->device->sector_size;
638 unsigned int max_blocks = 0;
639
640 q->limits.discard_zeroes_data = 0;
641
642 /*
643 * When LBPRZ is reported, discard alignment and granularity
644 * must be fixed to the logical block size. Otherwise the block
645 * layer will drop misaligned portions of the request which can
646 * lead to data corruption. If LBPRZ is not set, we honor the
647 * device preference.
648 */
649 if (sdkp->lbprz) {
650 q->limits.discard_alignment = 0;
651 q->limits.discard_granularity = logical_block_size;
652 } else {
653 q->limits.discard_alignment = sdkp->unmap_alignment *
654 logical_block_size;
655 q->limits.discard_granularity =
656 max(sdkp->physical_block_size,
657 sdkp->unmap_granularity * logical_block_size);
658 }
659
660 sdkp->provisioning_mode = mode;
661
662 switch (mode) {
663
664 case SD_LBP_DISABLE:
665 blk_queue_max_discard_sectors(q, 0);
666 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
667 return;
668
669 case SD_LBP_UNMAP:
670 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
671 (u32)SD_MAX_WS16_BLOCKS);
672 break;
673
674 case SD_LBP_WS16:
675 max_blocks = min_not_zero(sdkp->max_ws_blocks,
676 (u32)SD_MAX_WS16_BLOCKS);
677 q->limits.discard_zeroes_data = sdkp->lbprz;
678 break;
679
680 case SD_LBP_WS10:
681 max_blocks = min_not_zero(sdkp->max_ws_blocks,
682 (u32)SD_MAX_WS10_BLOCKS);
683 q->limits.discard_zeroes_data = sdkp->lbprz;
684 break;
685
686 case SD_LBP_ZERO:
687 max_blocks = min_not_zero(sdkp->max_ws_blocks,
688 (u32)SD_MAX_WS10_BLOCKS);
689 q->limits.discard_zeroes_data = 1;
690 break;
691 }
692
693 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
694 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
695}
696
697/**
698 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
699 * @sdp: scsi device to operate one
700 * @rq: Request to prepare
701 *
702 * Will issue either UNMAP or WRITE SAME(16) depending on preference
703 * indicated by target device.
704 **/
705static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
706{
707 struct request *rq = cmd->request;
708 struct scsi_device *sdp = cmd->device;
709 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
710 sector_t sector = blk_rq_pos(rq);
711 unsigned int nr_sectors = blk_rq_sectors(rq);
712 unsigned int nr_bytes = blk_rq_bytes(rq);
713 unsigned int len;
714 int ret;
715 char *buf;
716 struct page *page;
717
718 sector >>= ilog2(sdp->sector_size) - 9;
719 nr_sectors >>= ilog2(sdp->sector_size) - 9;
720
721 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
722 if (!page)
723 return BLKPREP_DEFER;
724
725 switch (sdkp->provisioning_mode) {
726 case SD_LBP_UNMAP:
727 buf = page_address(page);
728
729 cmd->cmd_len = 10;
730 cmd->cmnd[0] = UNMAP;
731 cmd->cmnd[8] = 24;
732
733 put_unaligned_be16(6 + 16, &buf[0]);
734 put_unaligned_be16(16, &buf[2]);
735 put_unaligned_be64(sector, &buf[8]);
736 put_unaligned_be32(nr_sectors, &buf[16]);
737
738 len = 24;
739 break;
740
741 case SD_LBP_WS16:
742 cmd->cmd_len = 16;
743 cmd->cmnd[0] = WRITE_SAME_16;
744 cmd->cmnd[1] = 0x8; /* UNMAP */
745 put_unaligned_be64(sector, &cmd->cmnd[2]);
746 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
747
748 len = sdkp->device->sector_size;
749 break;
750
751 case SD_LBP_WS10:
752 case SD_LBP_ZERO:
753 cmd->cmd_len = 10;
754 cmd->cmnd[0] = WRITE_SAME;
755 if (sdkp->provisioning_mode == SD_LBP_WS10)
756 cmd->cmnd[1] = 0x8; /* UNMAP */
757 put_unaligned_be32(sector, &cmd->cmnd[2]);
758 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
759
760 len = sdkp->device->sector_size;
761 break;
762
763 default:
764 ret = BLKPREP_INVALID;
765 goto out;
766 }
767
768 rq->completion_data = page;
769 rq->timeout = SD_TIMEOUT;
770
771 cmd->transfersize = len;
772 cmd->allowed = SD_MAX_RETRIES;
773
774 /*
775 * Initially __data_len is set to the amount of data that needs to be
776 * transferred to the target. This amount depends on whether WRITE SAME
777 * or UNMAP is being used. After the scatterlist has been mapped by
778 * scsi_init_io() we set __data_len to the size of the area to be
779 * discarded on disk. This allows us to report completion on the full
780 * amount of blocks described by the request.
781 */
782 blk_add_request_payload(rq, page, len);
783 ret = scsi_init_io(cmd);
784 rq->__data_len = nr_bytes;
785
786out:
787 if (ret != BLKPREP_OK)
788 __free_page(page);
789 return ret;
790}
791
792static void sd_config_write_same(struct scsi_disk *sdkp)
793{
794 struct request_queue *q = sdkp->disk->queue;
795 unsigned int logical_block_size = sdkp->device->sector_size;
796
797 if (sdkp->device->no_write_same) {
798 sdkp->max_ws_blocks = 0;
799 goto out;
800 }
801
802 /* Some devices can not handle block counts above 0xffff despite
803 * supporting WRITE SAME(16). Consequently we default to 64k
804 * blocks per I/O unless the device explicitly advertises a
805 * bigger limit.
806 */
807 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
808 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
809 (u32)SD_MAX_WS16_BLOCKS);
810 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
811 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
812 (u32)SD_MAX_WS10_BLOCKS);
813 else {
814 sdkp->device->no_write_same = 1;
815 sdkp->max_ws_blocks = 0;
816 }
817
818out:
819 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
820 (logical_block_size >> 9));
821}
822
823/**
824 * sd_setup_write_same_cmnd - write the same data to multiple blocks
825 * @cmd: command to prepare
826 *
827 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
828 * preference indicated by target device.
829 **/
830static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
831{
832 struct request *rq = cmd->request;
833 struct scsi_device *sdp = cmd->device;
834 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
835 struct bio *bio = rq->bio;
836 sector_t sector = blk_rq_pos(rq);
837 unsigned int nr_sectors = blk_rq_sectors(rq);
838 unsigned int nr_bytes = blk_rq_bytes(rq);
839 int ret;
840
841 if (sdkp->device->no_write_same)
842 return BLKPREP_INVALID;
843
844 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
845
846 sector >>= ilog2(sdp->sector_size) - 9;
847 nr_sectors >>= ilog2(sdp->sector_size) - 9;
848
849 rq->timeout = SD_WRITE_SAME_TIMEOUT;
850
851 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
852 cmd->cmd_len = 16;
853 cmd->cmnd[0] = WRITE_SAME_16;
854 put_unaligned_be64(sector, &cmd->cmnd[2]);
855 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
856 } else {
857 cmd->cmd_len = 10;
858 cmd->cmnd[0] = WRITE_SAME;
859 put_unaligned_be32(sector, &cmd->cmnd[2]);
860 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
861 }
862
863 cmd->transfersize = sdp->sector_size;
864 cmd->allowed = SD_MAX_RETRIES;
865
866 /*
867 * For WRITE_SAME the data transferred in the DATA IN buffer is
868 * different from the amount of data actually written to the target.
869 *
870 * We set up __data_len to the amount of data transferred from the
871 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
872 * to transfer a single sector of data first, but then reset it to
873 * the amount of data to be written right after so that the I/O path
874 * knows how much to actually write.
875 */
876 rq->__data_len = sdp->sector_size;
877 ret = scsi_init_io(cmd);
878 rq->__data_len = nr_bytes;
879 return ret;
880}
881
882static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
883{
884 struct request *rq = cmd->request;
885
886 /* flush requests don't perform I/O, zero the S/G table */
887 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
888
889 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
890 cmd->cmd_len = 10;
891 cmd->transfersize = 0;
892 cmd->allowed = SD_MAX_RETRIES;
893
894 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
895 return BLKPREP_OK;
896}
897
898static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
899{
900 struct request *rq = SCpnt->request;
901 struct scsi_device *sdp = SCpnt->device;
902 struct gendisk *disk = rq->rq_disk;
903 struct scsi_disk *sdkp;
904 sector_t block = blk_rq_pos(rq);
905 sector_t threshold;
906 unsigned int this_count = blk_rq_sectors(rq);
907 unsigned int dif, dix;
908 int ret;
909 unsigned char protect;
910
911 ret = scsi_init_io(SCpnt);
912 if (ret != BLKPREP_OK)
913 goto out;
914 SCpnt = rq->special;
915 sdkp = scsi_disk(disk);
916
917 /* from here on until we're complete, any goto out
918 * is used for a killable error condition */
919 ret = BLKPREP_KILL;
920
921 SCSI_LOG_HLQUEUE(1,
922 scmd_printk(KERN_INFO, SCpnt,
923 "%s: block=%llu, count=%d\n",
924 __func__, (unsigned long long)block, this_count));
925
926 if (!sdp || !scsi_device_online(sdp) ||
927 block + blk_rq_sectors(rq) > get_capacity(disk)) {
928 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
929 "Finishing %u sectors\n",
930 blk_rq_sectors(rq)));
931 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
932 "Retry with 0x%p\n", SCpnt));
933 goto out;
934 }
935
936 if (sdp->changed) {
937 /*
938 * quietly refuse to do anything to a changed disc until
939 * the changed bit has been reset
940 */
941 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
942 goto out;
943 }
944
945 /*
946 * Some SD card readers can't handle multi-sector accesses which touch
947 * the last one or two hardware sectors. Split accesses as needed.
948 */
949 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
950 (sdp->sector_size / 512);
951
952 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
953 if (block < threshold) {
954 /* Access up to the threshold but not beyond */
955 this_count = threshold - block;
956 } else {
957 /* Access only a single hardware sector */
958 this_count = sdp->sector_size / 512;
959 }
960 }
961
962 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
963 (unsigned long long)block));
964
965 /*
966 * If we have a 1K hardware sectorsize, prevent access to single
967 * 512 byte sectors. In theory we could handle this - in fact
968 * the scsi cdrom driver must be able to handle this because
969 * we typically use 1K blocksizes, and cdroms typically have
970 * 2K hardware sectorsizes. Of course, things are simpler
971 * with the cdrom, since it is read-only. For performance
972 * reasons, the filesystems should be able to handle this
973 * and not force the scsi disk driver to use bounce buffers
974 * for this.
975 */
976 if (sdp->sector_size == 1024) {
977 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
978 scmd_printk(KERN_ERR, SCpnt,
979 "Bad block number requested\n");
980 goto out;
981 } else {
982 block = block >> 1;
983 this_count = this_count >> 1;
984 }
985 }
986 if (sdp->sector_size == 2048) {
987 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
988 scmd_printk(KERN_ERR, SCpnt,
989 "Bad block number requested\n");
990 goto out;
991 } else {
992 block = block >> 2;
993 this_count = this_count >> 2;
994 }
995 }
996 if (sdp->sector_size == 4096) {
997 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
998 scmd_printk(KERN_ERR, SCpnt,
999 "Bad block number requested\n");
1000 goto out;
1001 } else {
1002 block = block >> 3;
1003 this_count = this_count >> 3;
1004 }
1005 }
1006 if (rq_data_dir(rq) == WRITE) {
1007 SCpnt->cmnd[0] = WRITE_6;
1008
1009 if (blk_integrity_rq(rq))
1010 sd_dif_prepare(SCpnt);
1011
1012 } else if (rq_data_dir(rq) == READ) {
1013 SCpnt->cmnd[0] = READ_6;
1014 } else {
1015 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1016 goto out;
1017 }
1018
1019 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1020 "%s %d/%u 512 byte blocks.\n",
1021 (rq_data_dir(rq) == WRITE) ?
1022 "writing" : "reading", this_count,
1023 blk_rq_sectors(rq)));
1024
1025 dix = scsi_prot_sg_count(SCpnt);
1026 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1027
1028 if (dif || dix)
1029 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1030 else
1031 protect = 0;
1032
1033 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
1034 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1035
1036 if (unlikely(SCpnt->cmnd == NULL)) {
1037 ret = BLKPREP_DEFER;
1038 goto out;
1039 }
1040
1041 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1042 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1043 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1044 SCpnt->cmnd[7] = 0x18;
1045 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1046 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1047
1048 /* LBA */
1049 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1050 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1051 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1052 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1053 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1054 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1055 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1056 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1057
1058 /* Expected Indirect LBA */
1059 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1060 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1061 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1062 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1063
1064 /* Transfer length */
1065 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1066 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1067 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1068 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1069 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1070 SCpnt->cmnd[0] += READ_16 - READ_6;
1071 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1072 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1073 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1074 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1075 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1076 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1077 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1078 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1079 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1080 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1081 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1082 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1083 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1084 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1085 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1086 scsi_device_protection(SCpnt->device) ||
1087 SCpnt->device->use_10_for_rw) {
1088 SCpnt->cmnd[0] += READ_10 - READ_6;
1089 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1090 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1091 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1092 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1093 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1095 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1097 } else {
1098 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1099 /*
1100 * This happens only if this drive failed
1101 * 10byte rw command with ILLEGAL_REQUEST
1102 * during operation and thus turned off
1103 * use_10_for_rw.
1104 */
1105 scmd_printk(KERN_ERR, SCpnt,
1106 "FUA write on READ/WRITE(6) drive\n");
1107 goto out;
1108 }
1109
1110 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1111 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1112 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1113 SCpnt->cmnd[4] = (unsigned char) this_count;
1114 SCpnt->cmnd[5] = 0;
1115 }
1116 SCpnt->sdb.length = this_count * sdp->sector_size;
1117
1118 /*
1119 * We shouldn't disconnect in the middle of a sector, so with a dumb
1120 * host adapter, it's safe to assume that we can at least transfer
1121 * this many bytes between each connect / disconnect.
1122 */
1123 SCpnt->transfersize = sdp->sector_size;
1124 SCpnt->underflow = this_count << 9;
1125 SCpnt->allowed = SD_MAX_RETRIES;
1126
1127 /*
1128 * This indicates that the command is ready from our end to be
1129 * queued.
1130 */
1131 ret = BLKPREP_OK;
1132 out:
1133 return ret;
1134}
1135
1136static int sd_init_command(struct scsi_cmnd *cmd)
1137{
1138 struct request *rq = cmd->request;
1139
1140 if (rq->cmd_flags & REQ_DISCARD)
1141 return sd_setup_discard_cmnd(cmd);
1142 else if (rq->cmd_flags & REQ_WRITE_SAME)
1143 return sd_setup_write_same_cmnd(cmd);
1144 else if (rq->cmd_flags & REQ_FLUSH)
1145 return sd_setup_flush_cmnd(cmd);
1146 else
1147 return sd_setup_read_write_cmnd(cmd);
1148}
1149
1150static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1151{
1152 struct request *rq = SCpnt->request;
1153
1154 if (rq->cmd_flags & REQ_DISCARD)
1155 __free_page(rq->completion_data);
1156
1157 if (SCpnt->cmnd != rq->cmd) {
1158 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1159 SCpnt->cmnd = NULL;
1160 SCpnt->cmd_len = 0;
1161 }
1162}
1163
1164/**
1165 * sd_open - open a scsi disk device
1166 * @inode: only i_rdev member may be used
1167 * @filp: only f_mode and f_flags may be used
1168 *
1169 * Returns 0 if successful. Returns a negated errno value in case
1170 * of error.
1171 *
1172 * Note: This can be called from a user context (e.g. fsck(1) )
1173 * or from within the kernel (e.g. as a result of a mount(1) ).
1174 * In the latter case @inode and @filp carry an abridged amount
1175 * of information as noted above.
1176 *
1177 * Locking: called with bdev->bd_mutex held.
1178 **/
1179static int sd_open(struct block_device *bdev, fmode_t mode)
1180{
1181 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1182 struct scsi_device *sdev;
1183 int retval;
1184
1185 if (!sdkp)
1186 return -ENXIO;
1187
1188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1189
1190 sdev = sdkp->device;
1191
1192 /*
1193 * If the device is in error recovery, wait until it is done.
1194 * If the device is offline, then disallow any access to it.
1195 */
1196 retval = -ENXIO;
1197 if (!scsi_block_when_processing_errors(sdev))
1198 goto error_out;
1199
1200 if (sdev->removable || sdkp->write_prot)
1201 check_disk_change(bdev);
1202
1203 /*
1204 * If the drive is empty, just let the open fail.
1205 */
1206 retval = -ENOMEDIUM;
1207 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1208 goto error_out;
1209
1210 /*
1211 * If the device has the write protect tab set, have the open fail
1212 * if the user expects to be able to write to the thing.
1213 */
1214 retval = -EROFS;
1215 if (sdkp->write_prot && (mode & FMODE_WRITE))
1216 goto error_out;
1217
1218 /*
1219 * It is possible that the disk changing stuff resulted in
1220 * the device being taken offline. If this is the case,
1221 * report this to the user, and don't pretend that the
1222 * open actually succeeded.
1223 */
1224 retval = -ENXIO;
1225 if (!scsi_device_online(sdev))
1226 goto error_out;
1227
1228 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1229 if (scsi_block_when_processing_errors(sdev))
1230 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1231 }
1232
1233 return 0;
1234
1235error_out:
1236 scsi_disk_put(sdkp);
1237 return retval;
1238}
1239
1240/**
1241 * sd_release - invoked when the (last) close(2) is called on this
1242 * scsi disk.
1243 * @inode: only i_rdev member may be used
1244 * @filp: only f_mode and f_flags may be used
1245 *
1246 * Returns 0.
1247 *
1248 * Note: may block (uninterruptible) if error recovery is underway
1249 * on this disk.
1250 *
1251 * Locking: called with bdev->bd_mutex held.
1252 **/
1253static void sd_release(struct gendisk *disk, fmode_t mode)
1254{
1255 struct scsi_disk *sdkp = scsi_disk(disk);
1256 struct scsi_device *sdev = sdkp->device;
1257
1258 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1259
1260 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1261 if (scsi_block_when_processing_errors(sdev))
1262 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1263 }
1264
1265 /*
1266 * XXX and what if there are packets in flight and this close()
1267 * XXX is followed by a "rmmod sd_mod"?
1268 */
1269
1270 scsi_disk_put(sdkp);
1271}
1272
1273static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1274{
1275 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1276 struct scsi_device *sdp = sdkp->device;
1277 struct Scsi_Host *host = sdp->host;
1278 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1279 int diskinfo[4];
1280
1281 /* default to most commonly used values */
1282 diskinfo[0] = 0x40; /* 1 << 6 */
1283 diskinfo[1] = 0x20; /* 1 << 5 */
1284 diskinfo[2] = capacity >> 11;
1285
1286 /* override with calculated, extended default, or driver values */
1287 if (host->hostt->bios_param)
1288 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1289 else
1290 scsicam_bios_param(bdev, capacity, diskinfo);
1291
1292 geo->heads = diskinfo[0];
1293 geo->sectors = diskinfo[1];
1294 geo->cylinders = diskinfo[2];
1295 return 0;
1296}
1297
1298/**
1299 * sd_ioctl - process an ioctl
1300 * @inode: only i_rdev/i_bdev members may be used
1301 * @filp: only f_mode and f_flags may be used
1302 * @cmd: ioctl command number
1303 * @arg: this is third argument given to ioctl(2) system call.
1304 * Often contains a pointer.
1305 *
1306 * Returns 0 if successful (some ioctls return positive numbers on
1307 * success as well). Returns a negated errno value in case of error.
1308 *
1309 * Note: most ioctls are forward onto the block subsystem or further
1310 * down in the scsi subsystem.
1311 **/
1312static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1313 unsigned int cmd, unsigned long arg)
1314{
1315 struct gendisk *disk = bdev->bd_disk;
1316 struct scsi_disk *sdkp = scsi_disk(disk);
1317 struct scsi_device *sdp = sdkp->device;
1318 void __user *p = (void __user *)arg;
1319 int error;
1320
1321 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1322 "cmd=0x%x\n", disk->disk_name, cmd));
1323
1324 error = scsi_verify_blk_ioctl(bdev, cmd);
1325 if (error < 0)
1326 return error;
1327
1328 /*
1329 * If we are in the middle of error recovery, don't let anyone
1330 * else try and use this device. Also, if error recovery fails, it
1331 * may try and take the device offline, in which case all further
1332 * access to the device is prohibited.
1333 */
1334 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1335 (mode & FMODE_NDELAY) != 0);
1336 if (error)
1337 goto out;
1338
1339 /*
1340 * Send SCSI addressing ioctls directly to mid level, send other
1341 * ioctls to block level and then onto mid level if they can't be
1342 * resolved.
1343 */
1344 switch (cmd) {
1345 case SCSI_IOCTL_GET_IDLUN:
1346 case SCSI_IOCTL_GET_BUS_NUMBER:
1347 error = scsi_ioctl(sdp, cmd, p);
1348 break;
1349 default:
1350 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1351 if (error != -ENOTTY)
1352 break;
1353 error = scsi_ioctl(sdp, cmd, p);
1354 break;
1355 }
1356out:
1357 return error;
1358}
1359
1360static void set_media_not_present(struct scsi_disk *sdkp)
1361{
1362 if (sdkp->media_present)
1363 sdkp->device->changed = 1;
1364
1365 if (sdkp->device->removable) {
1366 sdkp->media_present = 0;
1367 sdkp->capacity = 0;
1368 }
1369}
1370
1371static int media_not_present(struct scsi_disk *sdkp,
1372 struct scsi_sense_hdr *sshdr)
1373{
1374 if (!scsi_sense_valid(sshdr))
1375 return 0;
1376
1377 /* not invoked for commands that could return deferred errors */
1378 switch (sshdr->sense_key) {
1379 case UNIT_ATTENTION:
1380 case NOT_READY:
1381 /* medium not present */
1382 if (sshdr->asc == 0x3A) {
1383 set_media_not_present(sdkp);
1384 return 1;
1385 }
1386 }
1387 return 0;
1388}
1389
1390/**
1391 * sd_check_events - check media events
1392 * @disk: kernel device descriptor
1393 * @clearing: disk events currently being cleared
1394 *
1395 * Returns mask of DISK_EVENT_*.
1396 *
1397 * Note: this function is invoked from the block subsystem.
1398 **/
1399static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1400{
1401 struct scsi_disk *sdkp = scsi_disk(disk);
1402 struct scsi_device *sdp = sdkp->device;
1403 struct scsi_sense_hdr *sshdr = NULL;
1404 int retval;
1405
1406 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1407
1408 /*
1409 * If the device is offline, don't send any commands - just pretend as
1410 * if the command failed. If the device ever comes back online, we
1411 * can deal with it then. It is only because of unrecoverable errors
1412 * that we would ever take a device offline in the first place.
1413 */
1414 if (!scsi_device_online(sdp)) {
1415 set_media_not_present(sdkp);
1416 goto out;
1417 }
1418
1419 /*
1420 * Using TEST_UNIT_READY enables differentiation between drive with
1421 * no cartridge loaded - NOT READY, drive with changed cartridge -
1422 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1423 *
1424 * Drives that auto spin down. eg iomega jaz 1G, will be started
1425 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1426 * sd_revalidate() is called.
1427 */
1428 retval = -ENODEV;
1429
1430 if (scsi_block_when_processing_errors(sdp)) {
1431 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1432 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1433 sshdr);
1434 }
1435
1436 /* failed to execute TUR, assume media not present */
1437 if (host_byte(retval)) {
1438 set_media_not_present(sdkp);
1439 goto out;
1440 }
1441
1442 if (media_not_present(sdkp, sshdr))
1443 goto out;
1444
1445 /*
1446 * For removable scsi disk we have to recognise the presence
1447 * of a disk in the drive.
1448 */
1449 if (!sdkp->media_present)
1450 sdp->changed = 1;
1451 sdkp->media_present = 1;
1452out:
1453 /*
1454 * sdp->changed is set under the following conditions:
1455 *
1456 * Medium present state has changed in either direction.
1457 * Device has indicated UNIT_ATTENTION.
1458 */
1459 kfree(sshdr);
1460 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1461 sdp->changed = 0;
1462 return retval;
1463}
1464
1465static int sd_sync_cache(struct scsi_disk *sdkp)
1466{
1467 int retries, res;
1468 struct scsi_device *sdp = sdkp->device;
1469 const int timeout = sdp->request_queue->rq_timeout
1470 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1471 struct scsi_sense_hdr sshdr;
1472
1473 if (!scsi_device_online(sdp))
1474 return -ENODEV;
1475
1476 for (retries = 3; retries > 0; --retries) {
1477 unsigned char cmd[10] = { 0 };
1478
1479 cmd[0] = SYNCHRONIZE_CACHE;
1480 /*
1481 * Leave the rest of the command zero to indicate
1482 * flush everything.
1483 */
1484 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1485 &sshdr, timeout, SD_MAX_RETRIES,
1486 NULL, REQ_PM);
1487 if (res == 0)
1488 break;
1489 }
1490
1491 if (res) {
1492 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1493
1494 if (driver_byte(res) & DRIVER_SENSE)
1495 sd_print_sense_hdr(sdkp, &sshdr);
1496 /* we need to evaluate the error return */
1497 if (scsi_sense_valid(&sshdr) &&
1498 (sshdr.asc == 0x3a || /* medium not present */
1499 sshdr.asc == 0x20)) /* invalid command */
1500 /* this is no error here */
1501 return 0;
1502
1503 switch (host_byte(res)) {
1504 /* ignore errors due to racing a disconnection */
1505 case DID_BAD_TARGET:
1506 case DID_NO_CONNECT:
1507 return 0;
1508 /* signal the upper layer it might try again */
1509 case DID_BUS_BUSY:
1510 case DID_IMM_RETRY:
1511 case DID_REQUEUE:
1512 case DID_SOFT_ERROR:
1513 return -EBUSY;
1514 default:
1515 return -EIO;
1516 }
1517 }
1518 return 0;
1519}
1520
1521static void sd_rescan(struct device *dev)
1522{
1523 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1524
1525 revalidate_disk(sdkp->disk);
1526}
1527
1528
1529#ifdef CONFIG_COMPAT
1530/*
1531 * This gets directly called from VFS. When the ioctl
1532 * is not recognized we go back to the other translation paths.
1533 */
1534static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1535 unsigned int cmd, unsigned long arg)
1536{
1537 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1538 int error;
1539
1540 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1541 (mode & FMODE_NDELAY) != 0);
1542 if (error)
1543 return error;
1544
1545 /*
1546 * Let the static ioctl translation table take care of it.
1547 */
1548 if (!sdev->host->hostt->compat_ioctl)
1549 return -ENOIOCTLCMD;
1550 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1551}
1552#endif
1553
1554static char sd_pr_type(enum pr_type type)
1555{
1556 switch (type) {
1557 case PR_WRITE_EXCLUSIVE:
1558 return 0x01;
1559 case PR_EXCLUSIVE_ACCESS:
1560 return 0x03;
1561 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1562 return 0x05;
1563 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1564 return 0x06;
1565 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1566 return 0x07;
1567 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1568 return 0x08;
1569 default:
1570 return 0;
1571 }
1572};
1573
1574static int sd_pr_command(struct block_device *bdev, u8 sa,
1575 u64 key, u64 sa_key, u8 type, u8 flags)
1576{
1577 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1578 struct scsi_sense_hdr sshdr;
1579 int result;
1580 u8 cmd[16] = { 0, };
1581 u8 data[24] = { 0, };
1582
1583 cmd[0] = PERSISTENT_RESERVE_OUT;
1584 cmd[1] = sa;
1585 cmd[2] = type;
1586 put_unaligned_be32(sizeof(data), &cmd[5]);
1587
1588 put_unaligned_be64(key, &data[0]);
1589 put_unaligned_be64(sa_key, &data[8]);
1590 data[20] = flags;
1591
1592 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1593 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1594
1595 if ((driver_byte(result) & DRIVER_SENSE) &&
1596 (scsi_sense_valid(&sshdr))) {
1597 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1598 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1599 }
1600
1601 return result;
1602}
1603
1604static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1605 u32 flags)
1606{
1607 if (flags & ~PR_FL_IGNORE_KEY)
1608 return -EOPNOTSUPP;
1609 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1610 old_key, new_key, 0,
1611 (1 << 0) /* APTPL */ |
1612 (1 << 2) /* ALL_TG_PT */);
1613}
1614
1615static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1616 u32 flags)
1617{
1618 if (flags)
1619 return -EOPNOTSUPP;
1620 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1621}
1622
1623static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1624{
1625 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1626}
1627
1628static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1629 enum pr_type type, bool abort)
1630{
1631 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1632 sd_pr_type(type), 0);
1633}
1634
1635static int sd_pr_clear(struct block_device *bdev, u64 key)
1636{
1637 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1638}
1639
1640static const struct pr_ops sd_pr_ops = {
1641 .pr_register = sd_pr_register,
1642 .pr_reserve = sd_pr_reserve,
1643 .pr_release = sd_pr_release,
1644 .pr_preempt = sd_pr_preempt,
1645 .pr_clear = sd_pr_clear,
1646};
1647
1648static const struct block_device_operations sd_fops = {
1649 .owner = THIS_MODULE,
1650 .open = sd_open,
1651 .release = sd_release,
1652 .ioctl = sd_ioctl,
1653 .getgeo = sd_getgeo,
1654#ifdef CONFIG_COMPAT
1655 .compat_ioctl = sd_compat_ioctl,
1656#endif
1657 .check_events = sd_check_events,
1658 .revalidate_disk = sd_revalidate_disk,
1659 .unlock_native_capacity = sd_unlock_native_capacity,
1660 .pr_ops = &sd_pr_ops,
1661};
1662
1663/**
1664 * sd_eh_action - error handling callback
1665 * @scmd: sd-issued command that has failed
1666 * @eh_disp: The recovery disposition suggested by the midlayer
1667 *
1668 * This function is called by the SCSI midlayer upon completion of an
1669 * error test command (currently TEST UNIT READY). The result of sending
1670 * the eh command is passed in eh_disp. We're looking for devices that
1671 * fail medium access commands but are OK with non access commands like
1672 * test unit ready (so wrongly see the device as having a successful
1673 * recovery)
1674 **/
1675static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1676{
1677 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1678
1679 if (!scsi_device_online(scmd->device) ||
1680 !scsi_medium_access_command(scmd) ||
1681 host_byte(scmd->result) != DID_TIME_OUT ||
1682 eh_disp != SUCCESS)
1683 return eh_disp;
1684
1685 /*
1686 * The device has timed out executing a medium access command.
1687 * However, the TEST UNIT READY command sent during error
1688 * handling completed successfully. Either the device is in the
1689 * process of recovering or has it suffered an internal failure
1690 * that prevents access to the storage medium.
1691 */
1692 sdkp->medium_access_timed_out++;
1693
1694 /*
1695 * If the device keeps failing read/write commands but TEST UNIT
1696 * READY always completes successfully we assume that medium
1697 * access is no longer possible and take the device offline.
1698 */
1699 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1700 scmd_printk(KERN_ERR, scmd,
1701 "Medium access timeout failure. Offlining disk!\n");
1702 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1703
1704 return FAILED;
1705 }
1706
1707 return eh_disp;
1708}
1709
1710static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1711{
1712 u64 start_lba = blk_rq_pos(scmd->request);
1713 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1714 u64 factor = scmd->device->sector_size / 512;
1715 u64 bad_lba;
1716 int info_valid;
1717 /*
1718 * resid is optional but mostly filled in. When it's unused,
1719 * its value is zero, so we assume the whole buffer transferred
1720 */
1721 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1722 unsigned int good_bytes;
1723
1724 if (scmd->request->cmd_type != REQ_TYPE_FS)
1725 return 0;
1726
1727 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1728 SCSI_SENSE_BUFFERSIZE,
1729 &bad_lba);
1730 if (!info_valid)
1731 return 0;
1732
1733 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1734 return 0;
1735
1736 /* be careful ... don't want any overflows */
1737 do_div(start_lba, factor);
1738 do_div(end_lba, factor);
1739
1740 /* The bad lba was reported incorrectly, we have no idea where
1741 * the error is.
1742 */
1743 if (bad_lba < start_lba || bad_lba >= end_lba)
1744 return 0;
1745
1746 /* This computation should always be done in terms of
1747 * the resolution of the device's medium.
1748 */
1749 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1750 return min(good_bytes, transferred);
1751}
1752
1753/**
1754 * sd_done - bottom half handler: called when the lower level
1755 * driver has completed (successfully or otherwise) a scsi command.
1756 * @SCpnt: mid-level's per command structure.
1757 *
1758 * Note: potentially run from within an ISR. Must not block.
1759 **/
1760static int sd_done(struct scsi_cmnd *SCpnt)
1761{
1762 int result = SCpnt->result;
1763 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1764 struct scsi_sense_hdr sshdr;
1765 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1766 struct request *req = SCpnt->request;
1767 int sense_valid = 0;
1768 int sense_deferred = 0;
1769 unsigned char op = SCpnt->cmnd[0];
1770 unsigned char unmap = SCpnt->cmnd[1] & 8;
1771
1772 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1773 if (!result) {
1774 good_bytes = blk_rq_bytes(req);
1775 scsi_set_resid(SCpnt, 0);
1776 } else {
1777 good_bytes = 0;
1778 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1779 }
1780 }
1781
1782 if (result) {
1783 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1784 if (sense_valid)
1785 sense_deferred = scsi_sense_is_deferred(&sshdr);
1786 }
1787 sdkp->medium_access_timed_out = 0;
1788
1789 if (driver_byte(result) != DRIVER_SENSE &&
1790 (!sense_valid || sense_deferred))
1791 goto out;
1792
1793 switch (sshdr.sense_key) {
1794 case HARDWARE_ERROR:
1795 case MEDIUM_ERROR:
1796 good_bytes = sd_completed_bytes(SCpnt);
1797 break;
1798 case RECOVERED_ERROR:
1799 good_bytes = scsi_bufflen(SCpnt);
1800 break;
1801 case NO_SENSE:
1802 /* This indicates a false check condition, so ignore it. An
1803 * unknown amount of data was transferred so treat it as an
1804 * error.
1805 */
1806 SCpnt->result = 0;
1807 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1808 break;
1809 case ABORTED_COMMAND:
1810 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1811 good_bytes = sd_completed_bytes(SCpnt);
1812 break;
1813 case ILLEGAL_REQUEST:
1814 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1815 good_bytes = sd_completed_bytes(SCpnt);
1816 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1817 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1818 switch (op) {
1819 case UNMAP:
1820 sd_config_discard(sdkp, SD_LBP_DISABLE);
1821 break;
1822 case WRITE_SAME_16:
1823 case WRITE_SAME:
1824 if (unmap)
1825 sd_config_discard(sdkp, SD_LBP_DISABLE);
1826 else {
1827 sdkp->device->no_write_same = 1;
1828 sd_config_write_same(sdkp);
1829
1830 good_bytes = 0;
1831 req->__data_len = blk_rq_bytes(req);
1832 req->cmd_flags |= REQ_QUIET;
1833 }
1834 }
1835 }
1836 break;
1837 default:
1838 break;
1839 }
1840 out:
1841 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1842 "sd_done: completed %d of %d bytes\n",
1843 good_bytes, scsi_bufflen(SCpnt)));
1844
1845 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1846 sd_dif_complete(SCpnt, good_bytes);
1847
1848 return good_bytes;
1849}
1850
1851/*
1852 * spinup disk - called only in sd_revalidate_disk()
1853 */
1854static void
1855sd_spinup_disk(struct scsi_disk *sdkp)
1856{
1857 unsigned char cmd[10];
1858 unsigned long spintime_expire = 0;
1859 int retries, spintime;
1860 unsigned int the_result;
1861 struct scsi_sense_hdr sshdr;
1862 int sense_valid = 0;
1863
1864 spintime = 0;
1865
1866 /* Spin up drives, as required. Only do this at boot time */
1867 /* Spinup needs to be done for module loads too. */
1868 do {
1869 retries = 0;
1870
1871 do {
1872 cmd[0] = TEST_UNIT_READY;
1873 memset((void *) &cmd[1], 0, 9);
1874
1875 the_result = scsi_execute_req(sdkp->device, cmd,
1876 DMA_NONE, NULL, 0,
1877 &sshdr, SD_TIMEOUT,
1878 SD_MAX_RETRIES, NULL);
1879
1880 /*
1881 * If the drive has indicated to us that it
1882 * doesn't have any media in it, don't bother
1883 * with any more polling.
1884 */
1885 if (media_not_present(sdkp, &sshdr))
1886 return;
1887
1888 if (the_result)
1889 sense_valid = scsi_sense_valid(&sshdr);
1890 retries++;
1891 } while (retries < 3 &&
1892 (!scsi_status_is_good(the_result) ||
1893 ((driver_byte(the_result) & DRIVER_SENSE) &&
1894 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1895
1896 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1897 /* no sense, TUR either succeeded or failed
1898 * with a status error */
1899 if(!spintime && !scsi_status_is_good(the_result)) {
1900 sd_print_result(sdkp, "Test Unit Ready failed",
1901 the_result);
1902 }
1903 break;
1904 }
1905
1906 /*
1907 * The device does not want the automatic start to be issued.
1908 */
1909 if (sdkp->device->no_start_on_add)
1910 break;
1911
1912 if (sense_valid && sshdr.sense_key == NOT_READY) {
1913 if (sshdr.asc == 4 && sshdr.ascq == 3)
1914 break; /* manual intervention required */
1915 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1916 break; /* standby */
1917 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1918 break; /* unavailable */
1919 /*
1920 * Issue command to spin up drive when not ready
1921 */
1922 if (!spintime) {
1923 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1924 cmd[0] = START_STOP;
1925 cmd[1] = 1; /* Return immediately */
1926 memset((void *) &cmd[2], 0, 8);
1927 cmd[4] = 1; /* Start spin cycle */
1928 if (sdkp->device->start_stop_pwr_cond)
1929 cmd[4] |= 1 << 4;
1930 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1931 NULL, 0, &sshdr,
1932 SD_TIMEOUT, SD_MAX_RETRIES,
1933 NULL);
1934 spintime_expire = jiffies + 100 * HZ;
1935 spintime = 1;
1936 }
1937 /* Wait 1 second for next try */
1938 msleep(1000);
1939 printk(".");
1940
1941 /*
1942 * Wait for USB flash devices with slow firmware.
1943 * Yes, this sense key/ASC combination shouldn't
1944 * occur here. It's characteristic of these devices.
1945 */
1946 } else if (sense_valid &&
1947 sshdr.sense_key == UNIT_ATTENTION &&
1948 sshdr.asc == 0x28) {
1949 if (!spintime) {
1950 spintime_expire = jiffies + 5 * HZ;
1951 spintime = 1;
1952 }
1953 /* Wait 1 second for next try */
1954 msleep(1000);
1955 } else {
1956 /* we don't understand the sense code, so it's
1957 * probably pointless to loop */
1958 if(!spintime) {
1959 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1960 sd_print_sense_hdr(sdkp, &sshdr);
1961 }
1962 break;
1963 }
1964
1965 } while (spintime && time_before_eq(jiffies, spintime_expire));
1966
1967 if (spintime) {
1968 if (scsi_status_is_good(the_result))
1969 printk("ready\n");
1970 else
1971 printk("not responding...\n");
1972 }
1973}
1974
1975
1976/*
1977 * Determine whether disk supports Data Integrity Field.
1978 */
1979static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1980{
1981 struct scsi_device *sdp = sdkp->device;
1982 u8 type;
1983 int ret = 0;
1984
1985 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1986 return ret;
1987
1988 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1989
1990 if (type > SD_DIF_TYPE3_PROTECTION)
1991 ret = -ENODEV;
1992 else if (scsi_host_dif_capable(sdp->host, type))
1993 ret = 1;
1994
1995 if (sdkp->first_scan || type != sdkp->protection_type)
1996 switch (ret) {
1997 case -ENODEV:
1998 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1999 " protection type %u. Disabling disk!\n",
2000 type);
2001 break;
2002 case 1:
2003 sd_printk(KERN_NOTICE, sdkp,
2004 "Enabling DIF Type %u protection\n", type);
2005 break;
2006 case 0:
2007 sd_printk(KERN_NOTICE, sdkp,
2008 "Disabling DIF Type %u protection\n", type);
2009 break;
2010 }
2011
2012 sdkp->protection_type = type;
2013
2014 return ret;
2015}
2016
2017static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2018 struct scsi_sense_hdr *sshdr, int sense_valid,
2019 int the_result)
2020{
2021 if (driver_byte(the_result) & DRIVER_SENSE)
2022 sd_print_sense_hdr(sdkp, sshdr);
2023 else
2024 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2025
2026 /*
2027 * Set dirty bit for removable devices if not ready -
2028 * sometimes drives will not report this properly.
2029 */
2030 if (sdp->removable &&
2031 sense_valid && sshdr->sense_key == NOT_READY)
2032 set_media_not_present(sdkp);
2033
2034 /*
2035 * We used to set media_present to 0 here to indicate no media
2036 * in the drive, but some drives fail read capacity even with
2037 * media present, so we can't do that.
2038 */
2039 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2040}
2041
2042#define RC16_LEN 32
2043#if RC16_LEN > SD_BUF_SIZE
2044#error RC16_LEN must not be more than SD_BUF_SIZE
2045#endif
2046
2047#define READ_CAPACITY_RETRIES_ON_RESET 10
2048
2049static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2050 unsigned char *buffer)
2051{
2052 unsigned char cmd[16];
2053 struct scsi_sense_hdr sshdr;
2054 int sense_valid = 0;
2055 int the_result;
2056 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2057 unsigned int alignment;
2058 unsigned long long lba;
2059 unsigned sector_size;
2060
2061 if (sdp->no_read_capacity_16)
2062 return -EINVAL;
2063
2064 do {
2065 memset(cmd, 0, 16);
2066 cmd[0] = SERVICE_ACTION_IN_16;
2067 cmd[1] = SAI_READ_CAPACITY_16;
2068 cmd[13] = RC16_LEN;
2069 memset(buffer, 0, RC16_LEN);
2070
2071 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2072 buffer, RC16_LEN, &sshdr,
2073 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2074
2075 if (media_not_present(sdkp, &sshdr))
2076 return -ENODEV;
2077
2078 if (the_result) {
2079 sense_valid = scsi_sense_valid(&sshdr);
2080 if (sense_valid &&
2081 sshdr.sense_key == ILLEGAL_REQUEST &&
2082 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2083 sshdr.ascq == 0x00)
2084 /* Invalid Command Operation Code or
2085 * Invalid Field in CDB, just retry
2086 * silently with RC10 */
2087 return -EINVAL;
2088 if (sense_valid &&
2089 sshdr.sense_key == UNIT_ATTENTION &&
2090 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2091 /* Device reset might occur several times,
2092 * give it one more chance */
2093 if (--reset_retries > 0)
2094 continue;
2095 }
2096 retries--;
2097
2098 } while (the_result && retries);
2099
2100 if (the_result) {
2101 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2102 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2103 return -EINVAL;
2104 }
2105
2106 sector_size = get_unaligned_be32(&buffer[8]);
2107 lba = get_unaligned_be64(&buffer[0]);
2108
2109 if (sd_read_protection_type(sdkp, buffer) < 0) {
2110 sdkp->capacity = 0;
2111 return -ENODEV;
2112 }
2113
2114 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2115 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2116 "kernel compiled with support for large block "
2117 "devices.\n");
2118 sdkp->capacity = 0;
2119 return -EOVERFLOW;
2120 }
2121
2122 /* Logical blocks per physical block exponent */
2123 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2124
2125 /* Lowest aligned logical block */
2126 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2127 blk_queue_alignment_offset(sdp->request_queue, alignment);
2128 if (alignment && sdkp->first_scan)
2129 sd_printk(KERN_NOTICE, sdkp,
2130 "physical block alignment offset: %u\n", alignment);
2131
2132 if (buffer[14] & 0x80) { /* LBPME */
2133 sdkp->lbpme = 1;
2134
2135 if (buffer[14] & 0x40) /* LBPRZ */
2136 sdkp->lbprz = 1;
2137
2138 sd_config_discard(sdkp, SD_LBP_WS16);
2139 }
2140
2141 sdkp->capacity = lba + 1;
2142 return sector_size;
2143}
2144
2145static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2146 unsigned char *buffer)
2147{
2148 unsigned char cmd[16];
2149 struct scsi_sense_hdr sshdr;
2150 int sense_valid = 0;
2151 int the_result;
2152 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2153 sector_t lba;
2154 unsigned sector_size;
2155
2156 do {
2157 cmd[0] = READ_CAPACITY;
2158 memset(&cmd[1], 0, 9);
2159 memset(buffer, 0, 8);
2160
2161 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2162 buffer, 8, &sshdr,
2163 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2164
2165 if (media_not_present(sdkp, &sshdr))
2166 return -ENODEV;
2167
2168 if (the_result) {
2169 sense_valid = scsi_sense_valid(&sshdr);
2170 if (sense_valid &&
2171 sshdr.sense_key == UNIT_ATTENTION &&
2172 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2173 /* Device reset might occur several times,
2174 * give it one more chance */
2175 if (--reset_retries > 0)
2176 continue;
2177 }
2178 retries--;
2179
2180 } while (the_result && retries);
2181
2182 if (the_result) {
2183 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2184 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2185 return -EINVAL;
2186 }
2187
2188 sector_size = get_unaligned_be32(&buffer[4]);
2189 lba = get_unaligned_be32(&buffer[0]);
2190
2191 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2192 /* Some buggy (usb cardreader) devices return an lba of
2193 0xffffffff when the want to report a size of 0 (with
2194 which they really mean no media is present) */
2195 sdkp->capacity = 0;
2196 sdkp->physical_block_size = sector_size;
2197 return sector_size;
2198 }
2199
2200 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2201 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2202 "kernel compiled with support for large block "
2203 "devices.\n");
2204 sdkp->capacity = 0;
2205 return -EOVERFLOW;
2206 }
2207
2208 sdkp->capacity = lba + 1;
2209 sdkp->physical_block_size = sector_size;
2210 return sector_size;
2211}
2212
2213static int sd_try_rc16_first(struct scsi_device *sdp)
2214{
2215 if (sdp->host->max_cmd_len < 16)
2216 return 0;
2217 if (sdp->try_rc_10_first)
2218 return 0;
2219 if (sdp->scsi_level > SCSI_SPC_2)
2220 return 1;
2221 if (scsi_device_protection(sdp))
2222 return 1;
2223 return 0;
2224}
2225
2226/*
2227 * read disk capacity
2228 */
2229static void
2230sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2231{
2232 int sector_size;
2233 struct scsi_device *sdp = sdkp->device;
2234 sector_t old_capacity = sdkp->capacity;
2235
2236 if (sd_try_rc16_first(sdp)) {
2237 sector_size = read_capacity_16(sdkp, sdp, buffer);
2238 if (sector_size == -EOVERFLOW)
2239 goto got_data;
2240 if (sector_size == -ENODEV)
2241 return;
2242 if (sector_size < 0)
2243 sector_size = read_capacity_10(sdkp, sdp, buffer);
2244 if (sector_size < 0)
2245 return;
2246 } else {
2247 sector_size = read_capacity_10(sdkp, sdp, buffer);
2248 if (sector_size == -EOVERFLOW)
2249 goto got_data;
2250 if (sector_size < 0)
2251 return;
2252 if ((sizeof(sdkp->capacity) > 4) &&
2253 (sdkp->capacity > 0xffffffffULL)) {
2254 int old_sector_size = sector_size;
2255 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2256 "Trying to use READ CAPACITY(16).\n");
2257 sector_size = read_capacity_16(sdkp, sdp, buffer);
2258 if (sector_size < 0) {
2259 sd_printk(KERN_NOTICE, sdkp,
2260 "Using 0xffffffff as device size\n");
2261 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2262 sector_size = old_sector_size;
2263 goto got_data;
2264 }
2265 }
2266 }
2267
2268 /* Some devices are known to return the total number of blocks,
2269 * not the highest block number. Some devices have versions
2270 * which do this and others which do not. Some devices we might
2271 * suspect of doing this but we don't know for certain.
2272 *
2273 * If we know the reported capacity is wrong, decrement it. If
2274 * we can only guess, then assume the number of blocks is even
2275 * (usually true but not always) and err on the side of lowering
2276 * the capacity.
2277 */
2278 if (sdp->fix_capacity ||
2279 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2280 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2281 "from its reported value: %llu\n",
2282 (unsigned long long) sdkp->capacity);
2283 --sdkp->capacity;
2284 }
2285
2286got_data:
2287 if (sector_size == 0) {
2288 sector_size = 512;
2289 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2290 "assuming 512.\n");
2291 }
2292
2293 if (sector_size != 512 &&
2294 sector_size != 1024 &&
2295 sector_size != 2048 &&
2296 sector_size != 4096) {
2297 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2298 sector_size);
2299 /*
2300 * The user might want to re-format the drive with
2301 * a supported sectorsize. Once this happens, it
2302 * would be relatively trivial to set the thing up.
2303 * For this reason, we leave the thing in the table.
2304 */
2305 sdkp->capacity = 0;
2306 /*
2307 * set a bogus sector size so the normal read/write
2308 * logic in the block layer will eventually refuse any
2309 * request on this device without tripping over power
2310 * of two sector size assumptions
2311 */
2312 sector_size = 512;
2313 }
2314 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2315
2316 {
2317 char cap_str_2[10], cap_str_10[10];
2318
2319 string_get_size(sdkp->capacity, sector_size,
2320 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2321 string_get_size(sdkp->capacity, sector_size,
2322 STRING_UNITS_10, cap_str_10,
2323 sizeof(cap_str_10));
2324
2325 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2326 sd_printk(KERN_NOTICE, sdkp,
2327 "%llu %d-byte logical blocks: (%s/%s)\n",
2328 (unsigned long long)sdkp->capacity,
2329 sector_size, cap_str_10, cap_str_2);
2330
2331 if (sdkp->physical_block_size != sector_size)
2332 sd_printk(KERN_NOTICE, sdkp,
2333 "%u-byte physical blocks\n",
2334 sdkp->physical_block_size);
2335 }
2336 }
2337
2338 if (sdkp->capacity > 0xffffffff)
2339 sdp->use_16_for_rw = 1;
2340
2341 blk_queue_physical_block_size(sdp->request_queue,
2342 sdkp->physical_block_size);
2343 sdkp->device->sector_size = sector_size;
2344}
2345
2346/* called with buffer of length 512 */
2347static inline int
2348sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2349 unsigned char *buffer, int len, struct scsi_mode_data *data,
2350 struct scsi_sense_hdr *sshdr)
2351{
2352 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2353 SD_TIMEOUT, SD_MAX_RETRIES, data,
2354 sshdr);
2355}
2356
2357/*
2358 * read write protect setting, if possible - called only in sd_revalidate_disk()
2359 * called with buffer of length SD_BUF_SIZE
2360 */
2361static void
2362sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2363{
2364 int res;
2365 struct scsi_device *sdp = sdkp->device;
2366 struct scsi_mode_data data;
2367 int old_wp = sdkp->write_prot;
2368
2369 set_disk_ro(sdkp->disk, 0);
2370 if (sdp->skip_ms_page_3f) {
2371 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2372 return;
2373 }
2374
2375 if (sdp->use_192_bytes_for_3f) {
2376 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2377 } else {
2378 /*
2379 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2380 * We have to start carefully: some devices hang if we ask
2381 * for more than is available.
2382 */
2383 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2384
2385 /*
2386 * Second attempt: ask for page 0 When only page 0 is
2387 * implemented, a request for page 3F may return Sense Key
2388 * 5: Illegal Request, Sense Code 24: Invalid field in
2389 * CDB.
2390 */
2391 if (!scsi_status_is_good(res))
2392 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2393
2394 /*
2395 * Third attempt: ask 255 bytes, as we did earlier.
2396 */
2397 if (!scsi_status_is_good(res))
2398 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2399 &data, NULL);
2400 }
2401
2402 if (!scsi_status_is_good(res)) {
2403 sd_first_printk(KERN_WARNING, sdkp,
2404 "Test WP failed, assume Write Enabled\n");
2405 } else {
2406 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2407 set_disk_ro(sdkp->disk, sdkp->write_prot);
2408 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2409 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2410 sdkp->write_prot ? "on" : "off");
2411 sd_printk(KERN_DEBUG, sdkp,
2412 "Mode Sense: %02x %02x %02x %02x\n",
2413 buffer[0], buffer[1], buffer[2], buffer[3]);
2414 }
2415 }
2416}
2417
2418/*
2419 * sd_read_cache_type - called only from sd_revalidate_disk()
2420 * called with buffer of length SD_BUF_SIZE
2421 */
2422static void
2423sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2424{
2425 int len = 0, res;
2426 struct scsi_device *sdp = sdkp->device;
2427
2428 int dbd;
2429 int modepage;
2430 int first_len;
2431 struct scsi_mode_data data;
2432 struct scsi_sense_hdr sshdr;
2433 int old_wce = sdkp->WCE;
2434 int old_rcd = sdkp->RCD;
2435 int old_dpofua = sdkp->DPOFUA;
2436
2437
2438 if (sdkp->cache_override)
2439 return;
2440
2441 first_len = 4;
2442 if (sdp->skip_ms_page_8) {
2443 if (sdp->type == TYPE_RBC)
2444 goto defaults;
2445 else {
2446 if (sdp->skip_ms_page_3f)
2447 goto defaults;
2448 modepage = 0x3F;
2449 if (sdp->use_192_bytes_for_3f)
2450 first_len = 192;
2451 dbd = 0;
2452 }
2453 } else if (sdp->type == TYPE_RBC) {
2454 modepage = 6;
2455 dbd = 8;
2456 } else {
2457 modepage = 8;
2458 dbd = 0;
2459 }
2460
2461 /* cautiously ask */
2462 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2463 &data, &sshdr);
2464
2465 if (!scsi_status_is_good(res))
2466 goto bad_sense;
2467
2468 if (!data.header_length) {
2469 modepage = 6;
2470 first_len = 0;
2471 sd_first_printk(KERN_ERR, sdkp,
2472 "Missing header in MODE_SENSE response\n");
2473 }
2474
2475 /* that went OK, now ask for the proper length */
2476 len = data.length;
2477
2478 /*
2479 * We're only interested in the first three bytes, actually.
2480 * But the data cache page is defined for the first 20.
2481 */
2482 if (len < 3)
2483 goto bad_sense;
2484 else if (len > SD_BUF_SIZE) {
2485 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2486 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2487 len = SD_BUF_SIZE;
2488 }
2489 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2490 len = 192;
2491
2492 /* Get the data */
2493 if (len > first_len)
2494 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2495 &data, &sshdr);
2496
2497 if (scsi_status_is_good(res)) {
2498 int offset = data.header_length + data.block_descriptor_length;
2499
2500 while (offset < len) {
2501 u8 page_code = buffer[offset] & 0x3F;
2502 u8 spf = buffer[offset] & 0x40;
2503
2504 if (page_code == 8 || page_code == 6) {
2505 /* We're interested only in the first 3 bytes.
2506 */
2507 if (len - offset <= 2) {
2508 sd_first_printk(KERN_ERR, sdkp,
2509 "Incomplete mode parameter "
2510 "data\n");
2511 goto defaults;
2512 } else {
2513 modepage = page_code;
2514 goto Page_found;
2515 }
2516 } else {
2517 /* Go to the next page */
2518 if (spf && len - offset > 3)
2519 offset += 4 + (buffer[offset+2] << 8) +
2520 buffer[offset+3];
2521 else if (!spf && len - offset > 1)
2522 offset += 2 + buffer[offset+1];
2523 else {
2524 sd_first_printk(KERN_ERR, sdkp,
2525 "Incomplete mode "
2526 "parameter data\n");
2527 goto defaults;
2528 }
2529 }
2530 }
2531
2532 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2533 goto defaults;
2534
2535 Page_found:
2536 if (modepage == 8) {
2537 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2538 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2539 } else {
2540 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2541 sdkp->RCD = 0;
2542 }
2543
2544 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2545 if (sdp->broken_fua) {
2546 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2547 sdkp->DPOFUA = 0;
2548 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2549 sd_first_printk(KERN_NOTICE, sdkp,
2550 "Uses READ/WRITE(6), disabling FUA\n");
2551 sdkp->DPOFUA = 0;
2552 }
2553
2554 /* No cache flush allowed for write protected devices */
2555 if (sdkp->WCE && sdkp->write_prot)
2556 sdkp->WCE = 0;
2557
2558 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2559 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2560 sd_printk(KERN_NOTICE, sdkp,
2561 "Write cache: %s, read cache: %s, %s\n",
2562 sdkp->WCE ? "enabled" : "disabled",
2563 sdkp->RCD ? "disabled" : "enabled",
2564 sdkp->DPOFUA ? "supports DPO and FUA"
2565 : "doesn't support DPO or FUA");
2566
2567 return;
2568 }
2569
2570bad_sense:
2571 if (scsi_sense_valid(&sshdr) &&
2572 sshdr.sense_key == ILLEGAL_REQUEST &&
2573 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2574 /* Invalid field in CDB */
2575 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2576 else
2577 sd_first_printk(KERN_ERR, sdkp,
2578 "Asking for cache data failed\n");
2579
2580defaults:
2581 if (sdp->wce_default_on) {
2582 sd_first_printk(KERN_NOTICE, sdkp,
2583 "Assuming drive cache: write back\n");
2584 sdkp->WCE = 1;
2585 } else {
2586 sd_first_printk(KERN_ERR, sdkp,
2587 "Assuming drive cache: write through\n");
2588 sdkp->WCE = 0;
2589 }
2590 sdkp->RCD = 0;
2591 sdkp->DPOFUA = 0;
2592}
2593
2594/*
2595 * The ATO bit indicates whether the DIF application tag is available
2596 * for use by the operating system.
2597 */
2598static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2599{
2600 int res, offset;
2601 struct scsi_device *sdp = sdkp->device;
2602 struct scsi_mode_data data;
2603 struct scsi_sense_hdr sshdr;
2604
2605 if (sdp->type != TYPE_DISK)
2606 return;
2607
2608 if (sdkp->protection_type == 0)
2609 return;
2610
2611 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2612 SD_MAX_RETRIES, &data, &sshdr);
2613
2614 if (!scsi_status_is_good(res) || !data.header_length ||
2615 data.length < 6) {
2616 sd_first_printk(KERN_WARNING, sdkp,
2617 "getting Control mode page failed, assume no ATO\n");
2618
2619 if (scsi_sense_valid(&sshdr))
2620 sd_print_sense_hdr(sdkp, &sshdr);
2621
2622 return;
2623 }
2624
2625 offset = data.header_length + data.block_descriptor_length;
2626
2627 if ((buffer[offset] & 0x3f) != 0x0a) {
2628 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2629 return;
2630 }
2631
2632 if ((buffer[offset + 5] & 0x80) == 0)
2633 return;
2634
2635 sdkp->ATO = 1;
2636
2637 return;
2638}
2639
2640/**
2641 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2642 * @disk: disk to query
2643 */
2644static void sd_read_block_limits(struct scsi_disk *sdkp)
2645{
2646 unsigned int sector_sz = sdkp->device->sector_size;
2647 const int vpd_len = 64;
2648 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2649
2650 if (!buffer ||
2651 /* Block Limits VPD */
2652 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2653 goto out;
2654
2655 blk_queue_io_min(sdkp->disk->queue,
2656 get_unaligned_be16(&buffer[6]) * sector_sz);
2657
2658 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2659 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2660
2661 if (buffer[3] == 0x3c) {
2662 unsigned int lba_count, desc_count;
2663
2664 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2665
2666 if (!sdkp->lbpme)
2667 goto out;
2668
2669 lba_count = get_unaligned_be32(&buffer[20]);
2670 desc_count = get_unaligned_be32(&buffer[24]);
2671
2672 if (lba_count && desc_count)
2673 sdkp->max_unmap_blocks = lba_count;
2674
2675 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2676
2677 if (buffer[32] & 0x80)
2678 sdkp->unmap_alignment =
2679 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2680
2681 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2682
2683 if (sdkp->max_unmap_blocks)
2684 sd_config_discard(sdkp, SD_LBP_UNMAP);
2685 else
2686 sd_config_discard(sdkp, SD_LBP_WS16);
2687
2688 } else { /* LBP VPD page tells us what to use */
2689 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2690 sd_config_discard(sdkp, SD_LBP_UNMAP);
2691 else if (sdkp->lbpws)
2692 sd_config_discard(sdkp, SD_LBP_WS16);
2693 else if (sdkp->lbpws10)
2694 sd_config_discard(sdkp, SD_LBP_WS10);
2695 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2696 sd_config_discard(sdkp, SD_LBP_UNMAP);
2697 else
2698 sd_config_discard(sdkp, SD_LBP_DISABLE);
2699 }
2700 }
2701
2702 out:
2703 kfree(buffer);
2704}
2705
2706/**
2707 * sd_read_block_characteristics - Query block dev. characteristics
2708 * @disk: disk to query
2709 */
2710static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2711{
2712 unsigned char *buffer;
2713 u16 rot;
2714 const int vpd_len = 64;
2715
2716 buffer = kmalloc(vpd_len, GFP_KERNEL);
2717
2718 if (!buffer ||
2719 /* Block Device Characteristics VPD */
2720 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2721 goto out;
2722
2723 rot = get_unaligned_be16(&buffer[4]);
2724
2725 if (rot == 1) {
2726 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2727 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2728 }
2729
2730 out:
2731 kfree(buffer);
2732}
2733
2734/**
2735 * sd_read_block_provisioning - Query provisioning VPD page
2736 * @disk: disk to query
2737 */
2738static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2739{
2740 unsigned char *buffer;
2741 const int vpd_len = 8;
2742
2743 if (sdkp->lbpme == 0)
2744 return;
2745
2746 buffer = kmalloc(vpd_len, GFP_KERNEL);
2747
2748 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2749 goto out;
2750
2751 sdkp->lbpvpd = 1;
2752 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2753 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2754 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2755
2756 out:
2757 kfree(buffer);
2758}
2759
2760static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2761{
2762 struct scsi_device *sdev = sdkp->device;
2763
2764 if (sdev->host->no_write_same) {
2765 sdev->no_write_same = 1;
2766
2767 return;
2768 }
2769
2770 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2771 /* too large values might cause issues with arcmsr */
2772 int vpd_buf_len = 64;
2773
2774 sdev->no_report_opcodes = 1;
2775
2776 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2777 * CODES is unsupported and the device has an ATA
2778 * Information VPD page (SAT).
2779 */
2780 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2781 sdev->no_write_same = 1;
2782 }
2783
2784 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2785 sdkp->ws16 = 1;
2786
2787 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2788 sdkp->ws10 = 1;
2789}
2790
2791/**
2792 * sd_revalidate_disk - called the first time a new disk is seen,
2793 * performs disk spin up, read_capacity, etc.
2794 * @disk: struct gendisk we care about
2795 **/
2796static int sd_revalidate_disk(struct gendisk *disk)
2797{
2798 struct scsi_disk *sdkp = scsi_disk(disk);
2799 struct scsi_device *sdp = sdkp->device;
2800 struct request_queue *q = sdkp->disk->queue;
2801 unsigned char *buffer;
2802 unsigned int dev_max, rw_max;
2803
2804 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2805 "sd_revalidate_disk\n"));
2806
2807 /*
2808 * If the device is offline, don't try and read capacity or any
2809 * of the other niceties.
2810 */
2811 if (!scsi_device_online(sdp))
2812 goto out;
2813
2814 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2815 if (!buffer) {
2816 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2817 "allocation failure.\n");
2818 goto out;
2819 }
2820
2821 sd_spinup_disk(sdkp);
2822
2823 /*
2824 * Without media there is no reason to ask; moreover, some devices
2825 * react badly if we do.
2826 */
2827 if (sdkp->media_present) {
2828 sd_read_capacity(sdkp, buffer);
2829
2830 if (scsi_device_supports_vpd(sdp)) {
2831 sd_read_block_provisioning(sdkp);
2832 sd_read_block_limits(sdkp);
2833 sd_read_block_characteristics(sdkp);
2834 }
2835
2836 sd_read_write_protect_flag(sdkp, buffer);
2837 sd_read_cache_type(sdkp, buffer);
2838 sd_read_app_tag_own(sdkp, buffer);
2839 sd_read_write_same(sdkp, buffer);
2840 }
2841
2842 sdkp->first_scan = 0;
2843
2844 /*
2845 * We now have all cache related info, determine how we deal
2846 * with flush requests.
2847 */
2848 sd_set_flush_flag(sdkp);
2849
2850 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2851 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2852
2853 /* Some devices report a maximum block count for READ/WRITE requests. */
2854 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2855 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2856
2857 /*
2858 * Use the device's preferred I/O size for reads and writes
2859 * unless the reported value is unreasonably small, large, or
2860 * garbage.
2861 */
2862 if (sdkp->opt_xfer_blocks &&
2863 sdkp->opt_xfer_blocks <= dev_max &&
2864 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2865 sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE)
2866 rw_max = q->limits.io_opt =
2867 sdkp->opt_xfer_blocks * sdp->sector_size;
2868 else
2869 rw_max = BLK_DEF_MAX_SECTORS;
2870
2871 /* Combine with controller limits */
2872 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2873
2874 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2875 sd_config_write_same(sdkp);
2876 kfree(buffer);
2877
2878 out:
2879 return 0;
2880}
2881
2882/**
2883 * sd_unlock_native_capacity - unlock native capacity
2884 * @disk: struct gendisk to set capacity for
2885 *
2886 * Block layer calls this function if it detects that partitions
2887 * on @disk reach beyond the end of the device. If the SCSI host
2888 * implements ->unlock_native_capacity() method, it's invoked to
2889 * give it a chance to adjust the device capacity.
2890 *
2891 * CONTEXT:
2892 * Defined by block layer. Might sleep.
2893 */
2894static void sd_unlock_native_capacity(struct gendisk *disk)
2895{
2896 struct scsi_device *sdev = scsi_disk(disk)->device;
2897
2898 if (sdev->host->hostt->unlock_native_capacity)
2899 sdev->host->hostt->unlock_native_capacity(sdev);
2900}
2901
2902/**
2903 * sd_format_disk_name - format disk name
2904 * @prefix: name prefix - ie. "sd" for SCSI disks
2905 * @index: index of the disk to format name for
2906 * @buf: output buffer
2907 * @buflen: length of the output buffer
2908 *
2909 * SCSI disk names starts at sda. The 26th device is sdz and the
2910 * 27th is sdaa. The last one for two lettered suffix is sdzz
2911 * which is followed by sdaaa.
2912 *
2913 * This is basically 26 base counting with one extra 'nil' entry
2914 * at the beginning from the second digit on and can be
2915 * determined using similar method as 26 base conversion with the
2916 * index shifted -1 after each digit is computed.
2917 *
2918 * CONTEXT:
2919 * Don't care.
2920 *
2921 * RETURNS:
2922 * 0 on success, -errno on failure.
2923 */
2924static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2925{
2926 const int base = 'z' - 'a' + 1;
2927 char *begin = buf + strlen(prefix);
2928 char *end = buf + buflen;
2929 char *p;
2930 int unit;
2931
2932 p = end - 1;
2933 *p = '\0';
2934 unit = base;
2935 do {
2936 if (p == begin)
2937 return -EINVAL;
2938 *--p = 'a' + (index % unit);
2939 index = (index / unit) - 1;
2940 } while (index >= 0);
2941
2942 memmove(begin, p, end - p);
2943 memcpy(buf, prefix, strlen(prefix));
2944
2945 return 0;
2946}
2947
2948/*
2949 * The asynchronous part of sd_probe
2950 */
2951static void sd_probe_async(void *data, async_cookie_t cookie)
2952{
2953 struct scsi_disk *sdkp = data;
2954 struct scsi_device *sdp;
2955 struct gendisk *gd;
2956 u32 index;
2957 struct device *dev;
2958
2959 sdp = sdkp->device;
2960 gd = sdkp->disk;
2961 index = sdkp->index;
2962 dev = &sdp->sdev_gendev;
2963
2964 gd->major = sd_major((index & 0xf0) >> 4);
2965 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2966 gd->minors = SD_MINORS;
2967
2968 gd->fops = &sd_fops;
2969 gd->private_data = &sdkp->driver;
2970 gd->queue = sdkp->device->request_queue;
2971
2972 /* defaults, until the device tells us otherwise */
2973 sdp->sector_size = 512;
2974 sdkp->capacity = 0;
2975 sdkp->media_present = 1;
2976 sdkp->write_prot = 0;
2977 sdkp->cache_override = 0;
2978 sdkp->WCE = 0;
2979 sdkp->RCD = 0;
2980 sdkp->ATO = 0;
2981 sdkp->first_scan = 1;
2982 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2983
2984 sd_revalidate_disk(gd);
2985
2986 gd->driverfs_dev = &sdp->sdev_gendev;
2987 gd->flags = GENHD_FL_EXT_DEVT;
2988 if (sdp->removable) {
2989 gd->flags |= GENHD_FL_REMOVABLE;
2990 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2991 }
2992
2993 blk_pm_runtime_init(sdp->request_queue, dev);
2994 add_disk(gd);
2995 if (sdkp->capacity)
2996 sd_dif_config_host(sdkp);
2997
2998 sd_revalidate_disk(gd);
2999
3000 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3001 sdp->removable ? "removable " : "");
3002 scsi_autopm_put_device(sdp);
3003 put_device(&sdkp->dev);
3004}
3005
3006/**
3007 * sd_probe - called during driver initialization and whenever a
3008 * new scsi device is attached to the system. It is called once
3009 * for each scsi device (not just disks) present.
3010 * @dev: pointer to device object
3011 *
3012 * Returns 0 if successful (or not interested in this scsi device
3013 * (e.g. scanner)); 1 when there is an error.
3014 *
3015 * Note: this function is invoked from the scsi mid-level.
3016 * This function sets up the mapping between a given
3017 * <host,channel,id,lun> (found in sdp) and new device name
3018 * (e.g. /dev/sda). More precisely it is the block device major
3019 * and minor number that is chosen here.
3020 *
3021 * Assume sd_probe is not re-entrant (for time being)
3022 * Also think about sd_probe() and sd_remove() running coincidentally.
3023 **/
3024static int sd_probe(struct device *dev)
3025{
3026 struct scsi_device *sdp = to_scsi_device(dev);
3027 struct scsi_disk *sdkp;
3028 struct gendisk *gd;
3029 int index;
3030 int error;
3031
3032 scsi_autopm_get_device(sdp);
3033 error = -ENODEV;
3034 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3035 goto out;
3036
3037 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3038 "sd_probe\n"));
3039
3040 error = -ENOMEM;
3041 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3042 if (!sdkp)
3043 goto out;
3044
3045 gd = alloc_disk(SD_MINORS);
3046 if (!gd)
3047 goto out_free;
3048
3049 do {
3050 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3051 goto out_put;
3052
3053 spin_lock(&sd_index_lock);
3054 error = ida_get_new(&sd_index_ida, &index);
3055 spin_unlock(&sd_index_lock);
3056 } while (error == -EAGAIN);
3057
3058 if (error) {
3059 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3060 goto out_put;
3061 }
3062
3063 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3064 if (error) {
3065 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3066 goto out_free_index;
3067 }
3068
3069 sdkp->device = sdp;
3070 sdkp->driver = &sd_template;
3071 sdkp->disk = gd;
3072 sdkp->index = index;
3073 atomic_set(&sdkp->openers, 0);
3074 atomic_set(&sdkp->device->ioerr_cnt, 0);
3075
3076 if (!sdp->request_queue->rq_timeout) {
3077 if (sdp->type != TYPE_MOD)
3078 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3079 else
3080 blk_queue_rq_timeout(sdp->request_queue,
3081 SD_MOD_TIMEOUT);
3082 }
3083
3084 device_initialize(&sdkp->dev);
3085 sdkp->dev.parent = dev;
3086 sdkp->dev.class = &sd_disk_class;
3087 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3088
3089 error = device_add(&sdkp->dev);
3090 if (error)
3091 goto out_free_index;
3092
3093 get_device(dev);
3094 dev_set_drvdata(dev, sdkp);
3095
3096 get_device(&sdkp->dev); /* prevent release before async_schedule */
3097 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3098
3099 return 0;
3100
3101 out_free_index:
3102 spin_lock(&sd_index_lock);
3103 ida_remove(&sd_index_ida, index);
3104 spin_unlock(&sd_index_lock);
3105 out_put:
3106 put_disk(gd);
3107 out_free:
3108 kfree(sdkp);
3109 out:
3110 scsi_autopm_put_device(sdp);
3111 return error;
3112}
3113
3114/**
3115 * sd_remove - called whenever a scsi disk (previously recognized by
3116 * sd_probe) is detached from the system. It is called (potentially
3117 * multiple times) during sd module unload.
3118 * @sdp: pointer to mid level scsi device object
3119 *
3120 * Note: this function is invoked from the scsi mid-level.
3121 * This function potentially frees up a device name (e.g. /dev/sdc)
3122 * that could be re-used by a subsequent sd_probe().
3123 * This function is not called when the built-in sd driver is "exit-ed".
3124 **/
3125static int sd_remove(struct device *dev)
3126{
3127 struct scsi_disk *sdkp;
3128 dev_t devt;
3129
3130 sdkp = dev_get_drvdata(dev);
3131 devt = disk_devt(sdkp->disk);
3132 scsi_autopm_get_device(sdkp->device);
3133
3134 async_synchronize_full_domain(&scsi_sd_pm_domain);
3135 async_synchronize_full_domain(&scsi_sd_probe_domain);
3136 device_del(&sdkp->dev);
3137 del_gendisk(sdkp->disk);
3138 sd_shutdown(dev);
3139
3140 blk_register_region(devt, SD_MINORS, NULL,
3141 sd_default_probe, NULL, NULL);
3142
3143 mutex_lock(&sd_ref_mutex);
3144 dev_set_drvdata(dev, NULL);
3145 put_device(&sdkp->dev);
3146 mutex_unlock(&sd_ref_mutex);
3147
3148 return 0;
3149}
3150
3151/**
3152 * scsi_disk_release - Called to free the scsi_disk structure
3153 * @dev: pointer to embedded class device
3154 *
3155 * sd_ref_mutex must be held entering this routine. Because it is
3156 * called on last put, you should always use the scsi_disk_get()
3157 * scsi_disk_put() helpers which manipulate the semaphore directly
3158 * and never do a direct put_device.
3159 **/
3160static void scsi_disk_release(struct device *dev)
3161{
3162 struct scsi_disk *sdkp = to_scsi_disk(dev);
3163 struct gendisk *disk = sdkp->disk;
3164
3165 spin_lock(&sd_index_lock);
3166 ida_remove(&sd_index_ida, sdkp->index);
3167 spin_unlock(&sd_index_lock);
3168
3169 disk->private_data = NULL;
3170 put_disk(disk);
3171 put_device(&sdkp->device->sdev_gendev);
3172
3173 kfree(sdkp);
3174}
3175
3176static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3177{
3178 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3179 struct scsi_sense_hdr sshdr;
3180 struct scsi_device *sdp = sdkp->device;
3181 int res;
3182
3183 if (start)
3184 cmd[4] |= 1; /* START */
3185
3186 if (sdp->start_stop_pwr_cond)
3187 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3188
3189 if (!scsi_device_online(sdp))
3190 return -ENODEV;
3191
3192 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3193 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3194 if (res) {
3195 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3196 if (driver_byte(res) & DRIVER_SENSE)
3197 sd_print_sense_hdr(sdkp, &sshdr);
3198 if (scsi_sense_valid(&sshdr) &&
3199 /* 0x3a is medium not present */
3200 sshdr.asc == 0x3a)
3201 res = 0;
3202 }
3203
3204 /* SCSI error codes must not go to the generic layer */
3205 if (res)
3206 return -EIO;
3207
3208 return 0;
3209}
3210
3211/*
3212 * Send a SYNCHRONIZE CACHE instruction down to the device through
3213 * the normal SCSI command structure. Wait for the command to
3214 * complete.
3215 */
3216static void sd_shutdown(struct device *dev)
3217{
3218 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3219
3220 if (!sdkp)
3221 return; /* this can happen */
3222
3223 if (pm_runtime_suspended(dev))
3224 return;
3225
3226 if (sdkp->WCE && sdkp->media_present) {
3227 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3228 sd_sync_cache(sdkp);
3229 }
3230
3231 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3232 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3233 sd_start_stop_device(sdkp, 0);
3234 }
3235}
3236
3237static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3238{
3239 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3240 int ret = 0;
3241
3242 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3243 return 0;
3244
3245 if (sdkp->WCE && sdkp->media_present) {
3246 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3247 ret = sd_sync_cache(sdkp);
3248 if (ret) {
3249 /* ignore OFFLINE device */
3250 if (ret == -ENODEV)
3251 ret = 0;
3252 goto done;
3253 }
3254 }
3255
3256 if (sdkp->device->manage_start_stop) {
3257 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3258 /* an error is not worth aborting a system sleep */
3259 ret = sd_start_stop_device(sdkp, 0);
3260 if (ignore_stop_errors)
3261 ret = 0;
3262 }
3263
3264done:
3265 return ret;
3266}
3267
3268static int sd_suspend_system(struct device *dev)
3269{
3270 return sd_suspend_common(dev, true);
3271}
3272
3273static int sd_suspend_runtime(struct device *dev)
3274{
3275 return sd_suspend_common(dev, false);
3276}
3277
3278static int sd_resume(struct device *dev)
3279{
3280 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3281
3282 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3283 return 0;
3284
3285 if (!sdkp->device->manage_start_stop)
3286 return 0;
3287
3288 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3289 return sd_start_stop_device(sdkp, 1);
3290}
3291
3292/**
3293 * init_sd - entry point for this driver (both when built in or when
3294 * a module).
3295 *
3296 * Note: this function registers this driver with the scsi mid-level.
3297 **/
3298static int __init init_sd(void)
3299{
3300 int majors = 0, i, err;
3301
3302 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3303
3304 for (i = 0; i < SD_MAJORS; i++) {
3305 if (register_blkdev(sd_major(i), "sd") != 0)
3306 continue;
3307 majors++;
3308 blk_register_region(sd_major(i), SD_MINORS, NULL,
3309 sd_default_probe, NULL, NULL);
3310 }
3311
3312 if (!majors)
3313 return -ENODEV;
3314
3315 err = class_register(&sd_disk_class);
3316 if (err)
3317 goto err_out;
3318
3319 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3320 0, 0, NULL);
3321 if (!sd_cdb_cache) {
3322 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3323 err = -ENOMEM;
3324 goto err_out_class;
3325 }
3326
3327 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3328 if (!sd_cdb_pool) {
3329 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3330 err = -ENOMEM;
3331 goto err_out_cache;
3332 }
3333
3334 err = scsi_register_driver(&sd_template.gendrv);
3335 if (err)
3336 goto err_out_driver;
3337
3338 return 0;
3339
3340err_out_driver:
3341 mempool_destroy(sd_cdb_pool);
3342
3343err_out_cache:
3344 kmem_cache_destroy(sd_cdb_cache);
3345
3346err_out_class:
3347 class_unregister(&sd_disk_class);
3348err_out:
3349 for (i = 0; i < SD_MAJORS; i++)
3350 unregister_blkdev(sd_major(i), "sd");
3351 return err;
3352}
3353
3354/**
3355 * exit_sd - exit point for this driver (when it is a module).
3356 *
3357 * Note: this function unregisters this driver from the scsi mid-level.
3358 **/
3359static void __exit exit_sd(void)
3360{
3361 int i;
3362
3363 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3364
3365 scsi_unregister_driver(&sd_template.gendrv);
3366 mempool_destroy(sd_cdb_pool);
3367 kmem_cache_destroy(sd_cdb_cache);
3368
3369 class_unregister(&sd_disk_class);
3370
3371 for (i = 0; i < SD_MAJORS; i++) {
3372 blk_unregister_region(sd_major(i), SD_MINORS);
3373 unregister_blkdev(sd_major(i), "sd");
3374 }
3375}
3376
3377module_init(init_sd);
3378module_exit(exit_sd);
3379
3380static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3381 struct scsi_sense_hdr *sshdr)
3382{
3383 scsi_print_sense_hdr(sdkp->device,
3384 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3385}
3386
3387static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3388 int result)
3389{
3390 const char *hb_string = scsi_hostbyte_string(result);
3391 const char *db_string = scsi_driverbyte_string(result);
3392
3393 if (hb_string || db_string)
3394 sd_printk(KERN_INFO, sdkp,
3395 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3396 hb_string ? hb_string : "invalid",
3397 db_string ? db_string : "invalid");
3398 else
3399 sd_printk(KERN_INFO, sdkp,
3400 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3401 msg, host_byte(result), driver_byte(result));
3402}
3403
1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/genhd.h>
41#include <linux/hdreg.h>
42#include <linux/errno.h>
43#include <linux/idr.h>
44#include <linux/interrupt.h>
45#include <linux/init.h>
46#include <linux/blkdev.h>
47#include <linux/blkpg.h>
48#include <linux/delay.h>
49#include <linux/mutex.h>
50#include <linux/string_helpers.h>
51#include <linux/async.h>
52#include <linux/slab.h>
53#include <linux/pm_runtime.h>
54#include <asm/uaccess.h>
55#include <asm/unaligned.h>
56
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
65#include <scsi/scsicam.h>
66
67#include "sd.h"
68#include "scsi_priv.h"
69#include "scsi_logging.h"
70
71MODULE_AUTHOR("Eric Youngdale");
72MODULE_DESCRIPTION("SCSI disk (sd) driver");
73MODULE_LICENSE("GPL");
74
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96#define SD_MINORS 16
97#else
98#define SD_MINORS 0
99#endif
100
101static void sd_config_discard(struct scsi_disk *, unsigned int);
102static int sd_revalidate_disk(struct gendisk *);
103static void sd_unlock_native_capacity(struct gendisk *disk);
104static int sd_probe(struct device *);
105static int sd_remove(struct device *);
106static void sd_shutdown(struct device *);
107static int sd_suspend(struct device *, pm_message_t state);
108static int sd_resume(struct device *);
109static void sd_rescan(struct device *);
110static int sd_done(struct scsi_cmnd *);
111static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
112static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
113static void scsi_disk_release(struct device *cdev);
114static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115static void sd_print_result(struct scsi_disk *, int);
116
117static DEFINE_SPINLOCK(sd_index_lock);
118static DEFINE_IDA(sd_index_ida);
119
120/* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
123static DEFINE_MUTEX(sd_ref_mutex);
124
125static struct kmem_cache *sd_cdb_cache;
126static mempool_t *sd_cdb_pool;
127
128static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131};
132
133static ssize_t
134sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
136{
137 int i, ct = -1, rcd, wce, sp;
138 struct scsi_disk *sdkp = to_scsi_disk(dev);
139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
153 len = strlen(sd_cache_types[i]);
154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
178 sd_print_sense_hdr(sdkp, &sshdr);
179 return -EINVAL;
180 }
181 revalidate_disk(sdkp->disk);
182 return count;
183}
184
185static ssize_t
186sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
188{
189 struct scsi_disk *sdkp = to_scsi_disk(dev);
190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198}
199
200static ssize_t
201sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
203{
204 struct scsi_disk *sdkp = to_scsi_disk(dev);
205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216}
217
218static ssize_t
219sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
221{
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226}
227
228static ssize_t
229sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
230{
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234}
235
236static ssize_t
237sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
239{
240 struct scsi_disk *sdkp = to_scsi_disk(dev);
241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244}
245
246static ssize_t
247sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
249{
250 struct scsi_disk *sdkp = to_scsi_disk(dev);
251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253}
254
255static ssize_t
256sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262}
263
264static ssize_t
265sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
266 char *buf)
267{
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 struct scsi_device *sdp = sdkp->device;
270 unsigned int dif, dix;
271
272 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
273 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
274
275 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
276 dif = 0;
277 dix = 1;
278 }
279
280 if (!dif && !dix)
281 return snprintf(buf, 20, "none\n");
282
283 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284}
285
286static ssize_t
287sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
288 char *buf)
289{
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291
292 return snprintf(buf, 20, "%u\n", sdkp->ATO);
293}
294
295static ssize_t
296sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
297 char *buf)
298{
299 struct scsi_disk *sdkp = to_scsi_disk(dev);
300
301 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
302}
303
304static const char *lbp_mode[] = {
305 [SD_LBP_FULL] = "full",
306 [SD_LBP_UNMAP] = "unmap",
307 [SD_LBP_WS16] = "writesame_16",
308 [SD_LBP_WS10] = "writesame_10",
309 [SD_LBP_ZERO] = "writesame_zero",
310 [SD_LBP_DISABLE] = "disabled",
311};
312
313static ssize_t
314sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 struct scsi_disk *sdkp = to_scsi_disk(dev);
318
319 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
320}
321
322static ssize_t
323sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
324 const char *buf, size_t count)
325{
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328
329 if (!capable(CAP_SYS_ADMIN))
330 return -EACCES;
331
332 if (sdp->type != TYPE_DISK)
333 return -EINVAL;
334
335 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
336 sd_config_discard(sdkp, SD_LBP_UNMAP);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
338 sd_config_discard(sdkp, SD_LBP_WS16);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
340 sd_config_discard(sdkp, SD_LBP_WS10);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
342 sd_config_discard(sdkp, SD_LBP_ZERO);
343 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
344 sd_config_discard(sdkp, SD_LBP_DISABLE);
345 else
346 return -EINVAL;
347
348 return count;
349}
350
351static ssize_t
352sd_show_max_medium_access_timeouts(struct device *dev,
353 struct device_attribute *attr, char *buf)
354{
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
358}
359
360static ssize_t
361sd_store_max_medium_access_timeouts(struct device *dev,
362 struct device_attribute *attr,
363 const char *buf, size_t count)
364{
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
366 int err;
367
368 if (!capable(CAP_SYS_ADMIN))
369 return -EACCES;
370
371 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
372
373 return err ? err : count;
374}
375
376static struct device_attribute sd_disk_attrs[] = {
377 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
378 sd_store_cache_type),
379 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
380 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
381 sd_store_allow_restart),
382 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
383 sd_store_manage_start_stop),
384 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
385 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
386 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
387 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
388 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
389 sd_store_provisioning_mode),
390 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
391 sd_show_max_medium_access_timeouts,
392 sd_store_max_medium_access_timeouts),
393 __ATTR_NULL,
394};
395
396static struct class sd_disk_class = {
397 .name = "scsi_disk",
398 .owner = THIS_MODULE,
399 .dev_release = scsi_disk_release,
400 .dev_attrs = sd_disk_attrs,
401};
402
403static struct scsi_driver sd_template = {
404 .owner = THIS_MODULE,
405 .gendrv = {
406 .name = "sd",
407 .probe = sd_probe,
408 .remove = sd_remove,
409 .suspend = sd_suspend,
410 .resume = sd_resume,
411 .shutdown = sd_shutdown,
412 },
413 .rescan = sd_rescan,
414 .done = sd_done,
415 .eh_action = sd_eh_action,
416};
417
418/*
419 * Device no to disk mapping:
420 *
421 * major disc2 disc p1
422 * |............|.............|....|....| <- dev_t
423 * 31 20 19 8 7 4 3 0
424 *
425 * Inside a major, we have 16k disks, however mapped non-
426 * contiguously. The first 16 disks are for major0, the next
427 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * for major1, ...
429 * As we stay compatible with our numbering scheme, we can reuse
430 * the well-know SCSI majors 8, 65--71, 136--143.
431 */
432static int sd_major(int major_idx)
433{
434 switch (major_idx) {
435 case 0:
436 return SCSI_DISK0_MAJOR;
437 case 1 ... 7:
438 return SCSI_DISK1_MAJOR + major_idx - 1;
439 case 8 ... 15:
440 return SCSI_DISK8_MAJOR + major_idx - 8;
441 default:
442 BUG();
443 return 0; /* shut up gcc */
444 }
445}
446
447static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
448{
449 struct scsi_disk *sdkp = NULL;
450
451 if (disk->private_data) {
452 sdkp = scsi_disk(disk);
453 if (scsi_device_get(sdkp->device) == 0)
454 get_device(&sdkp->dev);
455 else
456 sdkp = NULL;
457 }
458 return sdkp;
459}
460
461static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
462{
463 struct scsi_disk *sdkp;
464
465 mutex_lock(&sd_ref_mutex);
466 sdkp = __scsi_disk_get(disk);
467 mutex_unlock(&sd_ref_mutex);
468 return sdkp;
469}
470
471static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
472{
473 struct scsi_disk *sdkp;
474
475 mutex_lock(&sd_ref_mutex);
476 sdkp = dev_get_drvdata(dev);
477 if (sdkp)
478 sdkp = __scsi_disk_get(sdkp->disk);
479 mutex_unlock(&sd_ref_mutex);
480 return sdkp;
481}
482
483static void scsi_disk_put(struct scsi_disk *sdkp)
484{
485 struct scsi_device *sdev = sdkp->device;
486
487 mutex_lock(&sd_ref_mutex);
488 put_device(&sdkp->dev);
489 scsi_device_put(sdev);
490 mutex_unlock(&sd_ref_mutex);
491}
492
493static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
494{
495 unsigned int prot_op = SCSI_PROT_NORMAL;
496 unsigned int dix = scsi_prot_sg_count(scmd);
497
498 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
499 if (dif && dix)
500 prot_op = SCSI_PROT_READ_PASS;
501 else if (dif && !dix)
502 prot_op = SCSI_PROT_READ_STRIP;
503 else if (!dif && dix)
504 prot_op = SCSI_PROT_READ_INSERT;
505 } else {
506 if (dif && dix)
507 prot_op = SCSI_PROT_WRITE_PASS;
508 else if (dif && !dix)
509 prot_op = SCSI_PROT_WRITE_INSERT;
510 else if (!dif && dix)
511 prot_op = SCSI_PROT_WRITE_STRIP;
512 }
513
514 scsi_set_prot_op(scmd, prot_op);
515 scsi_set_prot_type(scmd, dif);
516}
517
518static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
519{
520 struct request_queue *q = sdkp->disk->queue;
521 unsigned int logical_block_size = sdkp->device->sector_size;
522 unsigned int max_blocks = 0;
523
524 q->limits.discard_zeroes_data = sdkp->lbprz;
525 q->limits.discard_alignment = sdkp->unmap_alignment *
526 logical_block_size;
527 q->limits.discard_granularity =
528 max(sdkp->physical_block_size,
529 sdkp->unmap_granularity * logical_block_size);
530
531 sdkp->provisioning_mode = mode;
532
533 switch (mode) {
534
535 case SD_LBP_DISABLE:
536 q->limits.max_discard_sectors = 0;
537 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
538 return;
539
540 case SD_LBP_UNMAP:
541 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
542 break;
543
544 case SD_LBP_WS16:
545 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
546 break;
547
548 case SD_LBP_WS10:
549 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
550 break;
551
552 case SD_LBP_ZERO:
553 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
554 q->limits.discard_zeroes_data = 1;
555 break;
556 }
557
558 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
559 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
560}
561
562/**
563 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
564 * @sdp: scsi device to operate one
565 * @rq: Request to prepare
566 *
567 * Will issue either UNMAP or WRITE SAME(16) depending on preference
568 * indicated by target device.
569 **/
570static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
571{
572 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
573 struct bio *bio = rq->bio;
574 sector_t sector = bio->bi_sector;
575 unsigned int nr_sectors = bio_sectors(bio);
576 unsigned int len;
577 int ret;
578 char *buf;
579 struct page *page;
580
581 if (sdkp->device->sector_size == 4096) {
582 sector >>= 3;
583 nr_sectors >>= 3;
584 }
585
586 rq->timeout = SD_TIMEOUT;
587
588 memset(rq->cmd, 0, rq->cmd_len);
589
590 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
591 if (!page)
592 return BLKPREP_DEFER;
593
594 switch (sdkp->provisioning_mode) {
595 case SD_LBP_UNMAP:
596 buf = page_address(page);
597
598 rq->cmd_len = 10;
599 rq->cmd[0] = UNMAP;
600 rq->cmd[8] = 24;
601
602 put_unaligned_be16(6 + 16, &buf[0]);
603 put_unaligned_be16(16, &buf[2]);
604 put_unaligned_be64(sector, &buf[8]);
605 put_unaligned_be32(nr_sectors, &buf[16]);
606
607 len = 24;
608 break;
609
610 case SD_LBP_WS16:
611 rq->cmd_len = 16;
612 rq->cmd[0] = WRITE_SAME_16;
613 rq->cmd[1] = 0x8; /* UNMAP */
614 put_unaligned_be64(sector, &rq->cmd[2]);
615 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
616
617 len = sdkp->device->sector_size;
618 break;
619
620 case SD_LBP_WS10:
621 case SD_LBP_ZERO:
622 rq->cmd_len = 10;
623 rq->cmd[0] = WRITE_SAME;
624 if (sdkp->provisioning_mode == SD_LBP_WS10)
625 rq->cmd[1] = 0x8; /* UNMAP */
626 put_unaligned_be32(sector, &rq->cmd[2]);
627 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
628
629 len = sdkp->device->sector_size;
630 break;
631
632 default:
633 ret = BLKPREP_KILL;
634 goto out;
635 }
636
637 blk_add_request_payload(rq, page, len);
638 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
639 rq->buffer = page_address(page);
640
641out:
642 if (ret != BLKPREP_OK) {
643 __free_page(page);
644 rq->buffer = NULL;
645 }
646 return ret;
647}
648
649static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
650{
651 rq->timeout = SD_FLUSH_TIMEOUT;
652 rq->retries = SD_MAX_RETRIES;
653 rq->cmd[0] = SYNCHRONIZE_CACHE;
654 rq->cmd_len = 10;
655
656 return scsi_setup_blk_pc_cmnd(sdp, rq);
657}
658
659static void sd_unprep_fn(struct request_queue *q, struct request *rq)
660{
661 if (rq->cmd_flags & REQ_DISCARD) {
662 free_page((unsigned long)rq->buffer);
663 rq->buffer = NULL;
664 }
665}
666
667/**
668 * sd_prep_fn - build a scsi (read or write) command from
669 * information in the request structure.
670 * @SCpnt: pointer to mid-level's per scsi command structure that
671 * contains request and into which the scsi command is written
672 *
673 * Returns 1 if successful and 0 if error (or cannot be done now).
674 **/
675static int sd_prep_fn(struct request_queue *q, struct request *rq)
676{
677 struct scsi_cmnd *SCpnt;
678 struct scsi_device *sdp = q->queuedata;
679 struct gendisk *disk = rq->rq_disk;
680 struct scsi_disk *sdkp;
681 sector_t block = blk_rq_pos(rq);
682 sector_t threshold;
683 unsigned int this_count = blk_rq_sectors(rq);
684 int ret, host_dif;
685 unsigned char protect;
686
687 /*
688 * Discard request come in as REQ_TYPE_FS but we turn them into
689 * block PC requests to make life easier.
690 */
691 if (rq->cmd_flags & REQ_DISCARD) {
692 ret = scsi_setup_discard_cmnd(sdp, rq);
693 goto out;
694 } else if (rq->cmd_flags & REQ_FLUSH) {
695 ret = scsi_setup_flush_cmnd(sdp, rq);
696 goto out;
697 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
698 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
699 goto out;
700 } else if (rq->cmd_type != REQ_TYPE_FS) {
701 ret = BLKPREP_KILL;
702 goto out;
703 }
704 ret = scsi_setup_fs_cmnd(sdp, rq);
705 if (ret != BLKPREP_OK)
706 goto out;
707 SCpnt = rq->special;
708 sdkp = scsi_disk(disk);
709
710 /* from here on until we're complete, any goto out
711 * is used for a killable error condition */
712 ret = BLKPREP_KILL;
713
714 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
715 "sd_prep_fn: block=%llu, "
716 "count=%d\n",
717 (unsigned long long)block,
718 this_count));
719
720 if (!sdp || !scsi_device_online(sdp) ||
721 block + blk_rq_sectors(rq) > get_capacity(disk)) {
722 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
723 "Finishing %u sectors\n",
724 blk_rq_sectors(rq)));
725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
726 "Retry with 0x%p\n", SCpnt));
727 goto out;
728 }
729
730 if (sdp->changed) {
731 /*
732 * quietly refuse to do anything to a changed disc until
733 * the changed bit has been reset
734 */
735 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
736 goto out;
737 }
738
739 /*
740 * Some SD card readers can't handle multi-sector accesses which touch
741 * the last one or two hardware sectors. Split accesses as needed.
742 */
743 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
744 (sdp->sector_size / 512);
745
746 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
747 if (block < threshold) {
748 /* Access up to the threshold but not beyond */
749 this_count = threshold - block;
750 } else {
751 /* Access only a single hardware sector */
752 this_count = sdp->sector_size / 512;
753 }
754 }
755
756 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
757 (unsigned long long)block));
758
759 /*
760 * If we have a 1K hardware sectorsize, prevent access to single
761 * 512 byte sectors. In theory we could handle this - in fact
762 * the scsi cdrom driver must be able to handle this because
763 * we typically use 1K blocksizes, and cdroms typically have
764 * 2K hardware sectorsizes. Of course, things are simpler
765 * with the cdrom, since it is read-only. For performance
766 * reasons, the filesystems should be able to handle this
767 * and not force the scsi disk driver to use bounce buffers
768 * for this.
769 */
770 if (sdp->sector_size == 1024) {
771 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
774 goto out;
775 } else {
776 block = block >> 1;
777 this_count = this_count >> 1;
778 }
779 }
780 if (sdp->sector_size == 2048) {
781 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
784 goto out;
785 } else {
786 block = block >> 2;
787 this_count = this_count >> 2;
788 }
789 }
790 if (sdp->sector_size == 4096) {
791 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
792 scmd_printk(KERN_ERR, SCpnt,
793 "Bad block number requested\n");
794 goto out;
795 } else {
796 block = block >> 3;
797 this_count = this_count >> 3;
798 }
799 }
800 if (rq_data_dir(rq) == WRITE) {
801 if (!sdp->writeable) {
802 goto out;
803 }
804 SCpnt->cmnd[0] = WRITE_6;
805 SCpnt->sc_data_direction = DMA_TO_DEVICE;
806
807 if (blk_integrity_rq(rq) &&
808 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
809 goto out;
810
811 } else if (rq_data_dir(rq) == READ) {
812 SCpnt->cmnd[0] = READ_6;
813 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
814 } else {
815 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
816 goto out;
817 }
818
819 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
820 "%s %d/%u 512 byte blocks.\n",
821 (rq_data_dir(rq) == WRITE) ?
822 "writing" : "reading", this_count,
823 blk_rq_sectors(rq)));
824
825 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
826 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
827 if (host_dif)
828 protect = 1 << 5;
829 else
830 protect = 0;
831
832 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
833 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
834
835 if (unlikely(SCpnt->cmnd == NULL)) {
836 ret = BLKPREP_DEFER;
837 goto out;
838 }
839
840 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
841 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
842 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
843 SCpnt->cmnd[7] = 0x18;
844 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
845 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
846
847 /* LBA */
848 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
849 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
850 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
851 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
852 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
853 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
854 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
855 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
856
857 /* Expected Indirect LBA */
858 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
859 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
860 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
861 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
862
863 /* Transfer length */
864 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
865 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
866 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
868 } else if (block > 0xffffffff) {
869 SCpnt->cmnd[0] += READ_16 - READ_6;
870 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
871 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
872 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
873 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
874 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
875 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
876 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
877 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
878 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
879 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
880 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
881 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
882 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
883 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
884 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
885 scsi_device_protection(SCpnt->device) ||
886 SCpnt->device->use_10_for_rw) {
887 if (this_count > 0xffff)
888 this_count = 0xffff;
889
890 SCpnt->cmnd[0] += READ_10 - READ_6;
891 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
892 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
893 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
894 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
895 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
896 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
897 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
898 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
899 } else {
900 if (unlikely(rq->cmd_flags & REQ_FUA)) {
901 /*
902 * This happens only if this drive failed
903 * 10byte rw command with ILLEGAL_REQUEST
904 * during operation and thus turned off
905 * use_10_for_rw.
906 */
907 scmd_printk(KERN_ERR, SCpnt,
908 "FUA write on READ/WRITE(6) drive\n");
909 goto out;
910 }
911
912 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
913 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
914 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
915 SCpnt->cmnd[4] = (unsigned char) this_count;
916 SCpnt->cmnd[5] = 0;
917 }
918 SCpnt->sdb.length = this_count * sdp->sector_size;
919
920 /* If DIF or DIX is enabled, tell HBA how to handle request */
921 if (host_dif || scsi_prot_sg_count(SCpnt))
922 sd_prot_op(SCpnt, host_dif);
923
924 /*
925 * We shouldn't disconnect in the middle of a sector, so with a dumb
926 * host adapter, it's safe to assume that we can at least transfer
927 * this many bytes between each connect / disconnect.
928 */
929 SCpnt->transfersize = sdp->sector_size;
930 SCpnt->underflow = this_count << 9;
931 SCpnt->allowed = SD_MAX_RETRIES;
932
933 /*
934 * This indicates that the command is ready from our end to be
935 * queued.
936 */
937 ret = BLKPREP_OK;
938 out:
939 return scsi_prep_return(q, rq, ret);
940}
941
942/**
943 * sd_open - open a scsi disk device
944 * @inode: only i_rdev member may be used
945 * @filp: only f_mode and f_flags may be used
946 *
947 * Returns 0 if successful. Returns a negated errno value in case
948 * of error.
949 *
950 * Note: This can be called from a user context (e.g. fsck(1) )
951 * or from within the kernel (e.g. as a result of a mount(1) ).
952 * In the latter case @inode and @filp carry an abridged amount
953 * of information as noted above.
954 *
955 * Locking: called with bdev->bd_mutex held.
956 **/
957static int sd_open(struct block_device *bdev, fmode_t mode)
958{
959 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
960 struct scsi_device *sdev;
961 int retval;
962
963 if (!sdkp)
964 return -ENXIO;
965
966 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
967
968 sdev = sdkp->device;
969
970 retval = scsi_autopm_get_device(sdev);
971 if (retval)
972 goto error_autopm;
973
974 /*
975 * If the device is in error recovery, wait until it is done.
976 * If the device is offline, then disallow any access to it.
977 */
978 retval = -ENXIO;
979 if (!scsi_block_when_processing_errors(sdev))
980 goto error_out;
981
982 if (sdev->removable || sdkp->write_prot)
983 check_disk_change(bdev);
984
985 /*
986 * If the drive is empty, just let the open fail.
987 */
988 retval = -ENOMEDIUM;
989 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
990 goto error_out;
991
992 /*
993 * If the device has the write protect tab set, have the open fail
994 * if the user expects to be able to write to the thing.
995 */
996 retval = -EROFS;
997 if (sdkp->write_prot && (mode & FMODE_WRITE))
998 goto error_out;
999
1000 /*
1001 * It is possible that the disk changing stuff resulted in
1002 * the device being taken offline. If this is the case,
1003 * report this to the user, and don't pretend that the
1004 * open actually succeeded.
1005 */
1006 retval = -ENXIO;
1007 if (!scsi_device_online(sdev))
1008 goto error_out;
1009
1010 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1011 if (scsi_block_when_processing_errors(sdev))
1012 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1013 }
1014
1015 return 0;
1016
1017error_out:
1018 scsi_autopm_put_device(sdev);
1019error_autopm:
1020 scsi_disk_put(sdkp);
1021 return retval;
1022}
1023
1024/**
1025 * sd_release - invoked when the (last) close(2) is called on this
1026 * scsi disk.
1027 * @inode: only i_rdev member may be used
1028 * @filp: only f_mode and f_flags may be used
1029 *
1030 * Returns 0.
1031 *
1032 * Note: may block (uninterruptible) if error recovery is underway
1033 * on this disk.
1034 *
1035 * Locking: called with bdev->bd_mutex held.
1036 **/
1037static int sd_release(struct gendisk *disk, fmode_t mode)
1038{
1039 struct scsi_disk *sdkp = scsi_disk(disk);
1040 struct scsi_device *sdev = sdkp->device;
1041
1042 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1043
1044 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1045 if (scsi_block_when_processing_errors(sdev))
1046 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1047 }
1048
1049 /*
1050 * XXX and what if there are packets in flight and this close()
1051 * XXX is followed by a "rmmod sd_mod"?
1052 */
1053
1054 scsi_autopm_put_device(sdev);
1055 scsi_disk_put(sdkp);
1056 return 0;
1057}
1058
1059static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1060{
1061 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1062 struct scsi_device *sdp = sdkp->device;
1063 struct Scsi_Host *host = sdp->host;
1064 int diskinfo[4];
1065
1066 /* default to most commonly used values */
1067 diskinfo[0] = 0x40; /* 1 << 6 */
1068 diskinfo[1] = 0x20; /* 1 << 5 */
1069 diskinfo[2] = sdkp->capacity >> 11;
1070
1071 /* override with calculated, extended default, or driver values */
1072 if (host->hostt->bios_param)
1073 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1074 else
1075 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1076
1077 geo->heads = diskinfo[0];
1078 geo->sectors = diskinfo[1];
1079 geo->cylinders = diskinfo[2];
1080 return 0;
1081}
1082
1083/**
1084 * sd_ioctl - process an ioctl
1085 * @inode: only i_rdev/i_bdev members may be used
1086 * @filp: only f_mode and f_flags may be used
1087 * @cmd: ioctl command number
1088 * @arg: this is third argument given to ioctl(2) system call.
1089 * Often contains a pointer.
1090 *
1091 * Returns 0 if successful (some ioctls return positive numbers on
1092 * success as well). Returns a negated errno value in case of error.
1093 *
1094 * Note: most ioctls are forward onto the block subsystem or further
1095 * down in the scsi subsystem.
1096 **/
1097static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1098 unsigned int cmd, unsigned long arg)
1099{
1100 struct gendisk *disk = bdev->bd_disk;
1101 struct scsi_disk *sdkp = scsi_disk(disk);
1102 struct scsi_device *sdp = sdkp->device;
1103 void __user *p = (void __user *)arg;
1104 int error;
1105
1106 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1107 "cmd=0x%x\n", disk->disk_name, cmd));
1108
1109 error = scsi_verify_blk_ioctl(bdev, cmd);
1110 if (error < 0)
1111 return error;
1112
1113 /*
1114 * If we are in the middle of error recovery, don't let anyone
1115 * else try and use this device. Also, if error recovery fails, it
1116 * may try and take the device offline, in which case all further
1117 * access to the device is prohibited.
1118 */
1119 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1120 (mode & FMODE_NDELAY) != 0);
1121 if (!scsi_block_when_processing_errors(sdp) || !error)
1122 goto out;
1123
1124 /*
1125 * Send SCSI addressing ioctls directly to mid level, send other
1126 * ioctls to block level and then onto mid level if they can't be
1127 * resolved.
1128 */
1129 switch (cmd) {
1130 case SCSI_IOCTL_GET_IDLUN:
1131 case SCSI_IOCTL_GET_BUS_NUMBER:
1132 error = scsi_ioctl(sdp, cmd, p);
1133 break;
1134 default:
1135 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1136 if (error != -ENOTTY)
1137 break;
1138 error = scsi_ioctl(sdp, cmd, p);
1139 break;
1140 }
1141out:
1142 return error;
1143}
1144
1145static void set_media_not_present(struct scsi_disk *sdkp)
1146{
1147 if (sdkp->media_present)
1148 sdkp->device->changed = 1;
1149
1150 if (sdkp->device->removable) {
1151 sdkp->media_present = 0;
1152 sdkp->capacity = 0;
1153 }
1154}
1155
1156static int media_not_present(struct scsi_disk *sdkp,
1157 struct scsi_sense_hdr *sshdr)
1158{
1159 if (!scsi_sense_valid(sshdr))
1160 return 0;
1161
1162 /* not invoked for commands that could return deferred errors */
1163 switch (sshdr->sense_key) {
1164 case UNIT_ATTENTION:
1165 case NOT_READY:
1166 /* medium not present */
1167 if (sshdr->asc == 0x3A) {
1168 set_media_not_present(sdkp);
1169 return 1;
1170 }
1171 }
1172 return 0;
1173}
1174
1175/**
1176 * sd_check_events - check media events
1177 * @disk: kernel device descriptor
1178 * @clearing: disk events currently being cleared
1179 *
1180 * Returns mask of DISK_EVENT_*.
1181 *
1182 * Note: this function is invoked from the block subsystem.
1183 **/
1184static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1185{
1186 struct scsi_disk *sdkp = scsi_disk(disk);
1187 struct scsi_device *sdp = sdkp->device;
1188 struct scsi_sense_hdr *sshdr = NULL;
1189 int retval;
1190
1191 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1192
1193 /*
1194 * If the device is offline, don't send any commands - just pretend as
1195 * if the command failed. If the device ever comes back online, we
1196 * can deal with it then. It is only because of unrecoverable errors
1197 * that we would ever take a device offline in the first place.
1198 */
1199 if (!scsi_device_online(sdp)) {
1200 set_media_not_present(sdkp);
1201 goto out;
1202 }
1203
1204 /*
1205 * Using TEST_UNIT_READY enables differentiation between drive with
1206 * no cartridge loaded - NOT READY, drive with changed cartridge -
1207 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1208 *
1209 * Drives that auto spin down. eg iomega jaz 1G, will be started
1210 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1211 * sd_revalidate() is called.
1212 */
1213 retval = -ENODEV;
1214
1215 if (scsi_block_when_processing_errors(sdp)) {
1216 retval = scsi_autopm_get_device(sdp);
1217 if (retval)
1218 goto out;
1219
1220 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1221 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1222 sshdr);
1223 scsi_autopm_put_device(sdp);
1224 }
1225
1226 /* failed to execute TUR, assume media not present */
1227 if (host_byte(retval)) {
1228 set_media_not_present(sdkp);
1229 goto out;
1230 }
1231
1232 if (media_not_present(sdkp, sshdr))
1233 goto out;
1234
1235 /*
1236 * For removable scsi disk we have to recognise the presence
1237 * of a disk in the drive.
1238 */
1239 if (!sdkp->media_present)
1240 sdp->changed = 1;
1241 sdkp->media_present = 1;
1242out:
1243 /*
1244 * sdp->changed is set under the following conditions:
1245 *
1246 * Medium present state has changed in either direction.
1247 * Device has indicated UNIT_ATTENTION.
1248 */
1249 kfree(sshdr);
1250 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1251 sdp->changed = 0;
1252 return retval;
1253}
1254
1255static int sd_sync_cache(struct scsi_disk *sdkp)
1256{
1257 int retries, res;
1258 struct scsi_device *sdp = sdkp->device;
1259 struct scsi_sense_hdr sshdr;
1260
1261 if (!scsi_device_online(sdp))
1262 return -ENODEV;
1263
1264
1265 for (retries = 3; retries > 0; --retries) {
1266 unsigned char cmd[10] = { 0 };
1267
1268 cmd[0] = SYNCHRONIZE_CACHE;
1269 /*
1270 * Leave the rest of the command zero to indicate
1271 * flush everything.
1272 */
1273 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1274 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1275 if (res == 0)
1276 break;
1277 }
1278
1279 if (res) {
1280 sd_print_result(sdkp, res);
1281 if (driver_byte(res) & DRIVER_SENSE)
1282 sd_print_sense_hdr(sdkp, &sshdr);
1283 }
1284
1285 if (res)
1286 return -EIO;
1287 return 0;
1288}
1289
1290static void sd_rescan(struct device *dev)
1291{
1292 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1293
1294 if (sdkp) {
1295 revalidate_disk(sdkp->disk);
1296 scsi_disk_put(sdkp);
1297 }
1298}
1299
1300
1301#ifdef CONFIG_COMPAT
1302/*
1303 * This gets directly called from VFS. When the ioctl
1304 * is not recognized we go back to the other translation paths.
1305 */
1306static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1307 unsigned int cmd, unsigned long arg)
1308{
1309 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1310 int ret;
1311
1312 ret = scsi_verify_blk_ioctl(bdev, cmd);
1313 if (ret < 0)
1314 return ret;
1315
1316 /*
1317 * If we are in the middle of error recovery, don't let anyone
1318 * else try and use this device. Also, if error recovery fails, it
1319 * may try and take the device offline, in which case all further
1320 * access to the device is prohibited.
1321 */
1322 if (!scsi_block_when_processing_errors(sdev))
1323 return -ENODEV;
1324
1325 if (sdev->host->hostt->compat_ioctl) {
1326 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1327
1328 return ret;
1329 }
1330
1331 /*
1332 * Let the static ioctl translation table take care of it.
1333 */
1334 return -ENOIOCTLCMD;
1335}
1336#endif
1337
1338static const struct block_device_operations sd_fops = {
1339 .owner = THIS_MODULE,
1340 .open = sd_open,
1341 .release = sd_release,
1342 .ioctl = sd_ioctl,
1343 .getgeo = sd_getgeo,
1344#ifdef CONFIG_COMPAT
1345 .compat_ioctl = sd_compat_ioctl,
1346#endif
1347 .check_events = sd_check_events,
1348 .revalidate_disk = sd_revalidate_disk,
1349 .unlock_native_capacity = sd_unlock_native_capacity,
1350};
1351
1352/**
1353 * sd_eh_action - error handling callback
1354 * @scmd: sd-issued command that has failed
1355 * @eh_cmnd: The command that was sent during error handling
1356 * @eh_cmnd_len: Length of eh_cmnd in bytes
1357 * @eh_disp: The recovery disposition suggested by the midlayer
1358 *
1359 * This function is called by the SCSI midlayer upon completion of
1360 * an error handling command (TEST UNIT READY, START STOP UNIT,
1361 * etc.) The command sent to the device by the error handler is
1362 * stored in eh_cmnd. The result of sending the eh command is
1363 * passed in eh_disp.
1364 **/
1365static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1366 int eh_cmnd_len, int eh_disp)
1367{
1368 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1369
1370 if (!scsi_device_online(scmd->device) ||
1371 !scsi_medium_access_command(scmd))
1372 return eh_disp;
1373
1374 /*
1375 * The device has timed out executing a medium access command.
1376 * However, the TEST UNIT READY command sent during error
1377 * handling completed successfully. Either the device is in the
1378 * process of recovering or has it suffered an internal failure
1379 * that prevents access to the storage medium.
1380 */
1381 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1382 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1383 sdkp->medium_access_timed_out++;
1384
1385 /*
1386 * If the device keeps failing read/write commands but TEST UNIT
1387 * READY always completes successfully we assume that medium
1388 * access is no longer possible and take the device offline.
1389 */
1390 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1391 scmd_printk(KERN_ERR, scmd,
1392 "Medium access timeout failure. Offlining disk!\n");
1393 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1394
1395 return FAILED;
1396 }
1397
1398 return eh_disp;
1399}
1400
1401static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1402{
1403 u64 start_lba = blk_rq_pos(scmd->request);
1404 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1405 u64 bad_lba;
1406 int info_valid;
1407 /*
1408 * resid is optional but mostly filled in. When it's unused,
1409 * its value is zero, so we assume the whole buffer transferred
1410 */
1411 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1412 unsigned int good_bytes;
1413
1414 if (scmd->request->cmd_type != REQ_TYPE_FS)
1415 return 0;
1416
1417 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1418 SCSI_SENSE_BUFFERSIZE,
1419 &bad_lba);
1420 if (!info_valid)
1421 return 0;
1422
1423 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1424 return 0;
1425
1426 if (scmd->device->sector_size < 512) {
1427 /* only legitimate sector_size here is 256 */
1428 start_lba <<= 1;
1429 end_lba <<= 1;
1430 } else {
1431 /* be careful ... don't want any overflows */
1432 u64 factor = scmd->device->sector_size / 512;
1433 do_div(start_lba, factor);
1434 do_div(end_lba, factor);
1435 }
1436
1437 /* The bad lba was reported incorrectly, we have no idea where
1438 * the error is.
1439 */
1440 if (bad_lba < start_lba || bad_lba >= end_lba)
1441 return 0;
1442
1443 /* This computation should always be done in terms of
1444 * the resolution of the device's medium.
1445 */
1446 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1447 return min(good_bytes, transferred);
1448}
1449
1450/**
1451 * sd_done - bottom half handler: called when the lower level
1452 * driver has completed (successfully or otherwise) a scsi command.
1453 * @SCpnt: mid-level's per command structure.
1454 *
1455 * Note: potentially run from within an ISR. Must not block.
1456 **/
1457static int sd_done(struct scsi_cmnd *SCpnt)
1458{
1459 int result = SCpnt->result;
1460 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1461 struct scsi_sense_hdr sshdr;
1462 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1463 int sense_valid = 0;
1464 int sense_deferred = 0;
1465 unsigned char op = SCpnt->cmnd[0];
1466
1467 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1468 scsi_set_resid(SCpnt, 0);
1469
1470 if (result) {
1471 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1472 if (sense_valid)
1473 sense_deferred = scsi_sense_is_deferred(&sshdr);
1474 }
1475#ifdef CONFIG_SCSI_LOGGING
1476 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1477 if (sense_valid) {
1478 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1479 "sd_done: sb[respc,sk,asc,"
1480 "ascq]=%x,%x,%x,%x\n",
1481 sshdr.response_code,
1482 sshdr.sense_key, sshdr.asc,
1483 sshdr.ascq));
1484 }
1485#endif
1486 if (driver_byte(result) != DRIVER_SENSE &&
1487 (!sense_valid || sense_deferred))
1488 goto out;
1489
1490 sdkp->medium_access_timed_out = 0;
1491
1492 switch (sshdr.sense_key) {
1493 case HARDWARE_ERROR:
1494 case MEDIUM_ERROR:
1495 good_bytes = sd_completed_bytes(SCpnt);
1496 break;
1497 case RECOVERED_ERROR:
1498 good_bytes = scsi_bufflen(SCpnt);
1499 break;
1500 case NO_SENSE:
1501 /* This indicates a false check condition, so ignore it. An
1502 * unknown amount of data was transferred so treat it as an
1503 * error.
1504 */
1505 scsi_print_sense("sd", SCpnt);
1506 SCpnt->result = 0;
1507 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1508 break;
1509 case ABORTED_COMMAND:
1510 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1511 good_bytes = sd_completed_bytes(SCpnt);
1512 break;
1513 case ILLEGAL_REQUEST:
1514 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1515 good_bytes = sd_completed_bytes(SCpnt);
1516 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1517 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1518 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1519 sd_config_discard(sdkp, SD_LBP_DISABLE);
1520 break;
1521 default:
1522 break;
1523 }
1524 out:
1525 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1526 sd_dif_complete(SCpnt, good_bytes);
1527
1528 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1529 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1530
1531 /* We have to print a failed command here as the
1532 * extended CDB gets freed before scsi_io_completion()
1533 * is called.
1534 */
1535 if (result)
1536 scsi_print_command(SCpnt);
1537
1538 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1539 SCpnt->cmnd = NULL;
1540 SCpnt->cmd_len = 0;
1541 }
1542
1543 return good_bytes;
1544}
1545
1546/*
1547 * spinup disk - called only in sd_revalidate_disk()
1548 */
1549static void
1550sd_spinup_disk(struct scsi_disk *sdkp)
1551{
1552 unsigned char cmd[10];
1553 unsigned long spintime_expire = 0;
1554 int retries, spintime;
1555 unsigned int the_result;
1556 struct scsi_sense_hdr sshdr;
1557 int sense_valid = 0;
1558
1559 spintime = 0;
1560
1561 /* Spin up drives, as required. Only do this at boot time */
1562 /* Spinup needs to be done for module loads too. */
1563 do {
1564 retries = 0;
1565
1566 do {
1567 cmd[0] = TEST_UNIT_READY;
1568 memset((void *) &cmd[1], 0, 9);
1569
1570 the_result = scsi_execute_req(sdkp->device, cmd,
1571 DMA_NONE, NULL, 0,
1572 &sshdr, SD_TIMEOUT,
1573 SD_MAX_RETRIES, NULL);
1574
1575 /*
1576 * If the drive has indicated to us that it
1577 * doesn't have any media in it, don't bother
1578 * with any more polling.
1579 */
1580 if (media_not_present(sdkp, &sshdr))
1581 return;
1582
1583 if (the_result)
1584 sense_valid = scsi_sense_valid(&sshdr);
1585 retries++;
1586 } while (retries < 3 &&
1587 (!scsi_status_is_good(the_result) ||
1588 ((driver_byte(the_result) & DRIVER_SENSE) &&
1589 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1590
1591 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1592 /* no sense, TUR either succeeded or failed
1593 * with a status error */
1594 if(!spintime && !scsi_status_is_good(the_result)) {
1595 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1596 sd_print_result(sdkp, the_result);
1597 }
1598 break;
1599 }
1600
1601 /*
1602 * The device does not want the automatic start to be issued.
1603 */
1604 if (sdkp->device->no_start_on_add)
1605 break;
1606
1607 if (sense_valid && sshdr.sense_key == NOT_READY) {
1608 if (sshdr.asc == 4 && sshdr.ascq == 3)
1609 break; /* manual intervention required */
1610 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1611 break; /* standby */
1612 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1613 break; /* unavailable */
1614 /*
1615 * Issue command to spin up drive when not ready
1616 */
1617 if (!spintime) {
1618 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1619 cmd[0] = START_STOP;
1620 cmd[1] = 1; /* Return immediately */
1621 memset((void *) &cmd[2], 0, 8);
1622 cmd[4] = 1; /* Start spin cycle */
1623 if (sdkp->device->start_stop_pwr_cond)
1624 cmd[4] |= 1 << 4;
1625 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1626 NULL, 0, &sshdr,
1627 SD_TIMEOUT, SD_MAX_RETRIES,
1628 NULL);
1629 spintime_expire = jiffies + 100 * HZ;
1630 spintime = 1;
1631 }
1632 /* Wait 1 second for next try */
1633 msleep(1000);
1634 printk(".");
1635
1636 /*
1637 * Wait for USB flash devices with slow firmware.
1638 * Yes, this sense key/ASC combination shouldn't
1639 * occur here. It's characteristic of these devices.
1640 */
1641 } else if (sense_valid &&
1642 sshdr.sense_key == UNIT_ATTENTION &&
1643 sshdr.asc == 0x28) {
1644 if (!spintime) {
1645 spintime_expire = jiffies + 5 * HZ;
1646 spintime = 1;
1647 }
1648 /* Wait 1 second for next try */
1649 msleep(1000);
1650 } else {
1651 /* we don't understand the sense code, so it's
1652 * probably pointless to loop */
1653 if(!spintime) {
1654 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1655 sd_print_sense_hdr(sdkp, &sshdr);
1656 }
1657 break;
1658 }
1659
1660 } while (spintime && time_before_eq(jiffies, spintime_expire));
1661
1662 if (spintime) {
1663 if (scsi_status_is_good(the_result))
1664 printk("ready\n");
1665 else
1666 printk("not responding...\n");
1667 }
1668}
1669
1670
1671/*
1672 * Determine whether disk supports Data Integrity Field.
1673 */
1674static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1675{
1676 struct scsi_device *sdp = sdkp->device;
1677 u8 type;
1678
1679 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1680 return;
1681
1682 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1683
1684 if (type == sdkp->protection_type || !sdkp->first_scan)
1685 return;
1686
1687 sdkp->protection_type = type;
1688
1689 if (type > SD_DIF_TYPE3_PROTECTION) {
1690 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1691 "protection type %u. Disabling disk!\n", type);
1692 sdkp->capacity = 0;
1693 return;
1694 }
1695
1696 if (scsi_host_dif_capable(sdp->host, type))
1697 sd_printk(KERN_NOTICE, sdkp,
1698 "Enabling DIF Type %u protection\n", type);
1699 else
1700 sd_printk(KERN_NOTICE, sdkp,
1701 "Disabling DIF Type %u protection\n", type);
1702}
1703
1704static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1705 struct scsi_sense_hdr *sshdr, int sense_valid,
1706 int the_result)
1707{
1708 sd_print_result(sdkp, the_result);
1709 if (driver_byte(the_result) & DRIVER_SENSE)
1710 sd_print_sense_hdr(sdkp, sshdr);
1711 else
1712 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1713
1714 /*
1715 * Set dirty bit for removable devices if not ready -
1716 * sometimes drives will not report this properly.
1717 */
1718 if (sdp->removable &&
1719 sense_valid && sshdr->sense_key == NOT_READY)
1720 set_media_not_present(sdkp);
1721
1722 /*
1723 * We used to set media_present to 0 here to indicate no media
1724 * in the drive, but some drives fail read capacity even with
1725 * media present, so we can't do that.
1726 */
1727 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1728}
1729
1730#define RC16_LEN 32
1731#if RC16_LEN > SD_BUF_SIZE
1732#error RC16_LEN must not be more than SD_BUF_SIZE
1733#endif
1734
1735#define READ_CAPACITY_RETRIES_ON_RESET 10
1736
1737static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1738 unsigned char *buffer)
1739{
1740 unsigned char cmd[16];
1741 struct scsi_sense_hdr sshdr;
1742 int sense_valid = 0;
1743 int the_result;
1744 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1745 unsigned int alignment;
1746 unsigned long long lba;
1747 unsigned sector_size;
1748
1749 if (sdp->no_read_capacity_16)
1750 return -EINVAL;
1751
1752 do {
1753 memset(cmd, 0, 16);
1754 cmd[0] = SERVICE_ACTION_IN;
1755 cmd[1] = SAI_READ_CAPACITY_16;
1756 cmd[13] = RC16_LEN;
1757 memset(buffer, 0, RC16_LEN);
1758
1759 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1760 buffer, RC16_LEN, &sshdr,
1761 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1762
1763 if (media_not_present(sdkp, &sshdr))
1764 return -ENODEV;
1765
1766 if (the_result) {
1767 sense_valid = scsi_sense_valid(&sshdr);
1768 if (sense_valid &&
1769 sshdr.sense_key == ILLEGAL_REQUEST &&
1770 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1771 sshdr.ascq == 0x00)
1772 /* Invalid Command Operation Code or
1773 * Invalid Field in CDB, just retry
1774 * silently with RC10 */
1775 return -EINVAL;
1776 if (sense_valid &&
1777 sshdr.sense_key == UNIT_ATTENTION &&
1778 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1779 /* Device reset might occur several times,
1780 * give it one more chance */
1781 if (--reset_retries > 0)
1782 continue;
1783 }
1784 retries--;
1785
1786 } while (the_result && retries);
1787
1788 if (the_result) {
1789 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1790 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1791 return -EINVAL;
1792 }
1793
1794 sector_size = get_unaligned_be32(&buffer[8]);
1795 lba = get_unaligned_be64(&buffer[0]);
1796
1797 sd_read_protection_type(sdkp, buffer);
1798
1799 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1800 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1801 "kernel compiled with support for large block "
1802 "devices.\n");
1803 sdkp->capacity = 0;
1804 return -EOVERFLOW;
1805 }
1806
1807 /* Logical blocks per physical block exponent */
1808 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1809
1810 /* Lowest aligned logical block */
1811 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1812 blk_queue_alignment_offset(sdp->request_queue, alignment);
1813 if (alignment && sdkp->first_scan)
1814 sd_printk(KERN_NOTICE, sdkp,
1815 "physical block alignment offset: %u\n", alignment);
1816
1817 if (buffer[14] & 0x80) { /* LBPME */
1818 sdkp->lbpme = 1;
1819
1820 if (buffer[14] & 0x40) /* LBPRZ */
1821 sdkp->lbprz = 1;
1822
1823 sd_config_discard(sdkp, SD_LBP_WS16);
1824 }
1825
1826 sdkp->capacity = lba + 1;
1827 return sector_size;
1828}
1829
1830static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1831 unsigned char *buffer)
1832{
1833 unsigned char cmd[16];
1834 struct scsi_sense_hdr sshdr;
1835 int sense_valid = 0;
1836 int the_result;
1837 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1838 sector_t lba;
1839 unsigned sector_size;
1840
1841 do {
1842 cmd[0] = READ_CAPACITY;
1843 memset(&cmd[1], 0, 9);
1844 memset(buffer, 0, 8);
1845
1846 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1847 buffer, 8, &sshdr,
1848 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1849
1850 if (media_not_present(sdkp, &sshdr))
1851 return -ENODEV;
1852
1853 if (the_result) {
1854 sense_valid = scsi_sense_valid(&sshdr);
1855 if (sense_valid &&
1856 sshdr.sense_key == UNIT_ATTENTION &&
1857 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1858 /* Device reset might occur several times,
1859 * give it one more chance */
1860 if (--reset_retries > 0)
1861 continue;
1862 }
1863 retries--;
1864
1865 } while (the_result && retries);
1866
1867 if (the_result) {
1868 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1869 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1870 return -EINVAL;
1871 }
1872
1873 sector_size = get_unaligned_be32(&buffer[4]);
1874 lba = get_unaligned_be32(&buffer[0]);
1875
1876 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1877 /* Some buggy (usb cardreader) devices return an lba of
1878 0xffffffff when the want to report a size of 0 (with
1879 which they really mean no media is present) */
1880 sdkp->capacity = 0;
1881 sdkp->physical_block_size = sector_size;
1882 return sector_size;
1883 }
1884
1885 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1886 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1887 "kernel compiled with support for large block "
1888 "devices.\n");
1889 sdkp->capacity = 0;
1890 return -EOVERFLOW;
1891 }
1892
1893 sdkp->capacity = lba + 1;
1894 sdkp->physical_block_size = sector_size;
1895 return sector_size;
1896}
1897
1898static int sd_try_rc16_first(struct scsi_device *sdp)
1899{
1900 if (sdp->host->max_cmd_len < 16)
1901 return 0;
1902 if (sdp->try_rc_10_first)
1903 return 0;
1904 if (sdp->scsi_level > SCSI_SPC_2)
1905 return 1;
1906 if (scsi_device_protection(sdp))
1907 return 1;
1908 return 0;
1909}
1910
1911/*
1912 * read disk capacity
1913 */
1914static void
1915sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1916{
1917 int sector_size;
1918 struct scsi_device *sdp = sdkp->device;
1919 sector_t old_capacity = sdkp->capacity;
1920
1921 if (sd_try_rc16_first(sdp)) {
1922 sector_size = read_capacity_16(sdkp, sdp, buffer);
1923 if (sector_size == -EOVERFLOW)
1924 goto got_data;
1925 if (sector_size == -ENODEV)
1926 return;
1927 if (sector_size < 0)
1928 sector_size = read_capacity_10(sdkp, sdp, buffer);
1929 if (sector_size < 0)
1930 return;
1931 } else {
1932 sector_size = read_capacity_10(sdkp, sdp, buffer);
1933 if (sector_size == -EOVERFLOW)
1934 goto got_data;
1935 if (sector_size < 0)
1936 return;
1937 if ((sizeof(sdkp->capacity) > 4) &&
1938 (sdkp->capacity > 0xffffffffULL)) {
1939 int old_sector_size = sector_size;
1940 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1941 "Trying to use READ CAPACITY(16).\n");
1942 sector_size = read_capacity_16(sdkp, sdp, buffer);
1943 if (sector_size < 0) {
1944 sd_printk(KERN_NOTICE, sdkp,
1945 "Using 0xffffffff as device size\n");
1946 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1947 sector_size = old_sector_size;
1948 goto got_data;
1949 }
1950 }
1951 }
1952
1953 /* Some devices are known to return the total number of blocks,
1954 * not the highest block number. Some devices have versions
1955 * which do this and others which do not. Some devices we might
1956 * suspect of doing this but we don't know for certain.
1957 *
1958 * If we know the reported capacity is wrong, decrement it. If
1959 * we can only guess, then assume the number of blocks is even
1960 * (usually true but not always) and err on the side of lowering
1961 * the capacity.
1962 */
1963 if (sdp->fix_capacity ||
1964 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1965 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1966 "from its reported value: %llu\n",
1967 (unsigned long long) sdkp->capacity);
1968 --sdkp->capacity;
1969 }
1970
1971got_data:
1972 if (sector_size == 0) {
1973 sector_size = 512;
1974 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1975 "assuming 512.\n");
1976 }
1977
1978 if (sector_size != 512 &&
1979 sector_size != 1024 &&
1980 sector_size != 2048 &&
1981 sector_size != 4096 &&
1982 sector_size != 256) {
1983 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1984 sector_size);
1985 /*
1986 * The user might want to re-format the drive with
1987 * a supported sectorsize. Once this happens, it
1988 * would be relatively trivial to set the thing up.
1989 * For this reason, we leave the thing in the table.
1990 */
1991 sdkp->capacity = 0;
1992 /*
1993 * set a bogus sector size so the normal read/write
1994 * logic in the block layer will eventually refuse any
1995 * request on this device without tripping over power
1996 * of two sector size assumptions
1997 */
1998 sector_size = 512;
1999 }
2000 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2001
2002 {
2003 char cap_str_2[10], cap_str_10[10];
2004 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2005
2006 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2007 sizeof(cap_str_2));
2008 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2009 sizeof(cap_str_10));
2010
2011 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2012 sd_printk(KERN_NOTICE, sdkp,
2013 "%llu %d-byte logical blocks: (%s/%s)\n",
2014 (unsigned long long)sdkp->capacity,
2015 sector_size, cap_str_10, cap_str_2);
2016
2017 if (sdkp->physical_block_size != sector_size)
2018 sd_printk(KERN_NOTICE, sdkp,
2019 "%u-byte physical blocks\n",
2020 sdkp->physical_block_size);
2021 }
2022 }
2023
2024 /* Rescale capacity to 512-byte units */
2025 if (sector_size == 4096)
2026 sdkp->capacity <<= 3;
2027 else if (sector_size == 2048)
2028 sdkp->capacity <<= 2;
2029 else if (sector_size == 1024)
2030 sdkp->capacity <<= 1;
2031 else if (sector_size == 256)
2032 sdkp->capacity >>= 1;
2033
2034 blk_queue_physical_block_size(sdp->request_queue,
2035 sdkp->physical_block_size);
2036 sdkp->device->sector_size = sector_size;
2037}
2038
2039/* called with buffer of length 512 */
2040static inline int
2041sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2042 unsigned char *buffer, int len, struct scsi_mode_data *data,
2043 struct scsi_sense_hdr *sshdr)
2044{
2045 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2046 SD_TIMEOUT, SD_MAX_RETRIES, data,
2047 sshdr);
2048}
2049
2050/*
2051 * read write protect setting, if possible - called only in sd_revalidate_disk()
2052 * called with buffer of length SD_BUF_SIZE
2053 */
2054static void
2055sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2056{
2057 int res;
2058 struct scsi_device *sdp = sdkp->device;
2059 struct scsi_mode_data data;
2060 int old_wp = sdkp->write_prot;
2061
2062 set_disk_ro(sdkp->disk, 0);
2063 if (sdp->skip_ms_page_3f) {
2064 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2065 return;
2066 }
2067
2068 if (sdp->use_192_bytes_for_3f) {
2069 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2070 } else {
2071 /*
2072 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2073 * We have to start carefully: some devices hang if we ask
2074 * for more than is available.
2075 */
2076 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2077
2078 /*
2079 * Second attempt: ask for page 0 When only page 0 is
2080 * implemented, a request for page 3F may return Sense Key
2081 * 5: Illegal Request, Sense Code 24: Invalid field in
2082 * CDB.
2083 */
2084 if (!scsi_status_is_good(res))
2085 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2086
2087 /*
2088 * Third attempt: ask 255 bytes, as we did earlier.
2089 */
2090 if (!scsi_status_is_good(res))
2091 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2092 &data, NULL);
2093 }
2094
2095 if (!scsi_status_is_good(res)) {
2096 sd_printk(KERN_WARNING, sdkp,
2097 "Test WP failed, assume Write Enabled\n");
2098 } else {
2099 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2100 set_disk_ro(sdkp->disk, sdkp->write_prot);
2101 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2102 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2103 sdkp->write_prot ? "on" : "off");
2104 sd_printk(KERN_DEBUG, sdkp,
2105 "Mode Sense: %02x %02x %02x %02x\n",
2106 buffer[0], buffer[1], buffer[2], buffer[3]);
2107 }
2108 }
2109}
2110
2111/*
2112 * sd_read_cache_type - called only from sd_revalidate_disk()
2113 * called with buffer of length SD_BUF_SIZE
2114 */
2115static void
2116sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2117{
2118 int len = 0, res;
2119 struct scsi_device *sdp = sdkp->device;
2120
2121 int dbd;
2122 int modepage;
2123 int first_len;
2124 struct scsi_mode_data data;
2125 struct scsi_sense_hdr sshdr;
2126 int old_wce = sdkp->WCE;
2127 int old_rcd = sdkp->RCD;
2128 int old_dpofua = sdkp->DPOFUA;
2129
2130 first_len = 4;
2131 if (sdp->skip_ms_page_8) {
2132 if (sdp->type == TYPE_RBC)
2133 goto defaults;
2134 else {
2135 if (sdp->skip_ms_page_3f)
2136 goto defaults;
2137 modepage = 0x3F;
2138 if (sdp->use_192_bytes_for_3f)
2139 first_len = 192;
2140 dbd = 0;
2141 }
2142 } else if (sdp->type == TYPE_RBC) {
2143 modepage = 6;
2144 dbd = 8;
2145 } else {
2146 modepage = 8;
2147 dbd = 0;
2148 }
2149
2150 /* cautiously ask */
2151 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2152 &data, &sshdr);
2153
2154 if (!scsi_status_is_good(res))
2155 goto bad_sense;
2156
2157 if (!data.header_length) {
2158 modepage = 6;
2159 first_len = 0;
2160 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2161 }
2162
2163 /* that went OK, now ask for the proper length */
2164 len = data.length;
2165
2166 /*
2167 * We're only interested in the first three bytes, actually.
2168 * But the data cache page is defined for the first 20.
2169 */
2170 if (len < 3)
2171 goto bad_sense;
2172 else if (len > SD_BUF_SIZE) {
2173 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2174 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2175 len = SD_BUF_SIZE;
2176 }
2177 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2178 len = 192;
2179
2180 /* Get the data */
2181 if (len > first_len)
2182 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2183 &data, &sshdr);
2184
2185 if (scsi_status_is_good(res)) {
2186 int offset = data.header_length + data.block_descriptor_length;
2187
2188 while (offset < len) {
2189 u8 page_code = buffer[offset] & 0x3F;
2190 u8 spf = buffer[offset] & 0x40;
2191
2192 if (page_code == 8 || page_code == 6) {
2193 /* We're interested only in the first 3 bytes.
2194 */
2195 if (len - offset <= 2) {
2196 sd_printk(KERN_ERR, sdkp, "Incomplete "
2197 "mode parameter data\n");
2198 goto defaults;
2199 } else {
2200 modepage = page_code;
2201 goto Page_found;
2202 }
2203 } else {
2204 /* Go to the next page */
2205 if (spf && len - offset > 3)
2206 offset += 4 + (buffer[offset+2] << 8) +
2207 buffer[offset+3];
2208 else if (!spf && len - offset > 1)
2209 offset += 2 + buffer[offset+1];
2210 else {
2211 sd_printk(KERN_ERR, sdkp, "Incomplete "
2212 "mode parameter data\n");
2213 goto defaults;
2214 }
2215 }
2216 }
2217
2218 if (modepage == 0x3F) {
2219 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2220 "present\n");
2221 goto defaults;
2222 } else if ((buffer[offset] & 0x3f) != modepage) {
2223 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2224 goto defaults;
2225 }
2226 Page_found:
2227 if (modepage == 8) {
2228 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2229 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2230 } else {
2231 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2232 sdkp->RCD = 0;
2233 }
2234
2235 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2236 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2237 sd_printk(KERN_NOTICE, sdkp,
2238 "Uses READ/WRITE(6), disabling FUA\n");
2239 sdkp->DPOFUA = 0;
2240 }
2241
2242 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2243 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2244 sd_printk(KERN_NOTICE, sdkp,
2245 "Write cache: %s, read cache: %s, %s\n",
2246 sdkp->WCE ? "enabled" : "disabled",
2247 sdkp->RCD ? "disabled" : "enabled",
2248 sdkp->DPOFUA ? "supports DPO and FUA"
2249 : "doesn't support DPO or FUA");
2250
2251 return;
2252 }
2253
2254bad_sense:
2255 if (scsi_sense_valid(&sshdr) &&
2256 sshdr.sense_key == ILLEGAL_REQUEST &&
2257 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2258 /* Invalid field in CDB */
2259 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2260 else
2261 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2262
2263defaults:
2264 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2265 sdkp->WCE = 0;
2266 sdkp->RCD = 0;
2267 sdkp->DPOFUA = 0;
2268}
2269
2270/*
2271 * The ATO bit indicates whether the DIF application tag is available
2272 * for use by the operating system.
2273 */
2274static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2275{
2276 int res, offset;
2277 struct scsi_device *sdp = sdkp->device;
2278 struct scsi_mode_data data;
2279 struct scsi_sense_hdr sshdr;
2280
2281 if (sdp->type != TYPE_DISK)
2282 return;
2283
2284 if (sdkp->protection_type == 0)
2285 return;
2286
2287 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2288 SD_MAX_RETRIES, &data, &sshdr);
2289
2290 if (!scsi_status_is_good(res) || !data.header_length ||
2291 data.length < 6) {
2292 sd_printk(KERN_WARNING, sdkp,
2293 "getting Control mode page failed, assume no ATO\n");
2294
2295 if (scsi_sense_valid(&sshdr))
2296 sd_print_sense_hdr(sdkp, &sshdr);
2297
2298 return;
2299 }
2300
2301 offset = data.header_length + data.block_descriptor_length;
2302
2303 if ((buffer[offset] & 0x3f) != 0x0a) {
2304 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2305 return;
2306 }
2307
2308 if ((buffer[offset + 5] & 0x80) == 0)
2309 return;
2310
2311 sdkp->ATO = 1;
2312
2313 return;
2314}
2315
2316/**
2317 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2318 * @disk: disk to query
2319 */
2320static void sd_read_block_limits(struct scsi_disk *sdkp)
2321{
2322 unsigned int sector_sz = sdkp->device->sector_size;
2323 const int vpd_len = 64;
2324 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2325
2326 if (!buffer ||
2327 /* Block Limits VPD */
2328 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2329 goto out;
2330
2331 blk_queue_io_min(sdkp->disk->queue,
2332 get_unaligned_be16(&buffer[6]) * sector_sz);
2333 blk_queue_io_opt(sdkp->disk->queue,
2334 get_unaligned_be32(&buffer[12]) * sector_sz);
2335
2336 if (buffer[3] == 0x3c) {
2337 unsigned int lba_count, desc_count;
2338
2339 sdkp->max_ws_blocks =
2340 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2341 (u64)0xffffffff);
2342
2343 if (!sdkp->lbpme)
2344 goto out;
2345
2346 lba_count = get_unaligned_be32(&buffer[20]);
2347 desc_count = get_unaligned_be32(&buffer[24]);
2348
2349 if (lba_count && desc_count)
2350 sdkp->max_unmap_blocks = lba_count;
2351
2352 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2353
2354 if (buffer[32] & 0x80)
2355 sdkp->unmap_alignment =
2356 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2357
2358 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2359
2360 if (sdkp->max_unmap_blocks)
2361 sd_config_discard(sdkp, SD_LBP_UNMAP);
2362 else
2363 sd_config_discard(sdkp, SD_LBP_WS16);
2364
2365 } else { /* LBP VPD page tells us what to use */
2366
2367 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2368 sd_config_discard(sdkp, SD_LBP_UNMAP);
2369 else if (sdkp->lbpws)
2370 sd_config_discard(sdkp, SD_LBP_WS16);
2371 else if (sdkp->lbpws10)
2372 sd_config_discard(sdkp, SD_LBP_WS10);
2373 else
2374 sd_config_discard(sdkp, SD_LBP_DISABLE);
2375 }
2376 }
2377
2378 out:
2379 kfree(buffer);
2380}
2381
2382/**
2383 * sd_read_block_characteristics - Query block dev. characteristics
2384 * @disk: disk to query
2385 */
2386static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2387{
2388 unsigned char *buffer;
2389 u16 rot;
2390 const int vpd_len = 64;
2391
2392 buffer = kmalloc(vpd_len, GFP_KERNEL);
2393
2394 if (!buffer ||
2395 /* Block Device Characteristics VPD */
2396 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2397 goto out;
2398
2399 rot = get_unaligned_be16(&buffer[4]);
2400
2401 if (rot == 1)
2402 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2403
2404 out:
2405 kfree(buffer);
2406}
2407
2408/**
2409 * sd_read_block_provisioning - Query provisioning VPD page
2410 * @disk: disk to query
2411 */
2412static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2413{
2414 unsigned char *buffer;
2415 const int vpd_len = 8;
2416
2417 if (sdkp->lbpme == 0)
2418 return;
2419
2420 buffer = kmalloc(vpd_len, GFP_KERNEL);
2421
2422 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2423 goto out;
2424
2425 sdkp->lbpvpd = 1;
2426 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2427 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2428 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2429
2430 out:
2431 kfree(buffer);
2432}
2433
2434static int sd_try_extended_inquiry(struct scsi_device *sdp)
2435{
2436 /*
2437 * Although VPD inquiries can go to SCSI-2 type devices,
2438 * some USB ones crash on receiving them, and the pages
2439 * we currently ask for are for SPC-3 and beyond
2440 */
2441 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2442 return 1;
2443 return 0;
2444}
2445
2446/**
2447 * sd_revalidate_disk - called the first time a new disk is seen,
2448 * performs disk spin up, read_capacity, etc.
2449 * @disk: struct gendisk we care about
2450 **/
2451static int sd_revalidate_disk(struct gendisk *disk)
2452{
2453 struct scsi_disk *sdkp = scsi_disk(disk);
2454 struct scsi_device *sdp = sdkp->device;
2455 unsigned char *buffer;
2456 unsigned flush = 0;
2457
2458 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2459 "sd_revalidate_disk\n"));
2460
2461 /*
2462 * If the device is offline, don't try and read capacity or any
2463 * of the other niceties.
2464 */
2465 if (!scsi_device_online(sdp))
2466 goto out;
2467
2468 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2469 if (!buffer) {
2470 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2471 "allocation failure.\n");
2472 goto out;
2473 }
2474
2475 sd_spinup_disk(sdkp);
2476
2477 /*
2478 * Without media there is no reason to ask; moreover, some devices
2479 * react badly if we do.
2480 */
2481 if (sdkp->media_present) {
2482 sd_read_capacity(sdkp, buffer);
2483
2484 if (sd_try_extended_inquiry(sdp)) {
2485 sd_read_block_provisioning(sdkp);
2486 sd_read_block_limits(sdkp);
2487 sd_read_block_characteristics(sdkp);
2488 }
2489
2490 sd_read_write_protect_flag(sdkp, buffer);
2491 sd_read_cache_type(sdkp, buffer);
2492 sd_read_app_tag_own(sdkp, buffer);
2493 }
2494
2495 sdkp->first_scan = 0;
2496
2497 /*
2498 * We now have all cache related info, determine how we deal
2499 * with flush requests.
2500 */
2501 if (sdkp->WCE) {
2502 flush |= REQ_FLUSH;
2503 if (sdkp->DPOFUA)
2504 flush |= REQ_FUA;
2505 }
2506
2507 blk_queue_flush(sdkp->disk->queue, flush);
2508
2509 set_capacity(disk, sdkp->capacity);
2510 kfree(buffer);
2511
2512 out:
2513 return 0;
2514}
2515
2516/**
2517 * sd_unlock_native_capacity - unlock native capacity
2518 * @disk: struct gendisk to set capacity for
2519 *
2520 * Block layer calls this function if it detects that partitions
2521 * on @disk reach beyond the end of the device. If the SCSI host
2522 * implements ->unlock_native_capacity() method, it's invoked to
2523 * give it a chance to adjust the device capacity.
2524 *
2525 * CONTEXT:
2526 * Defined by block layer. Might sleep.
2527 */
2528static void sd_unlock_native_capacity(struct gendisk *disk)
2529{
2530 struct scsi_device *sdev = scsi_disk(disk)->device;
2531
2532 if (sdev->host->hostt->unlock_native_capacity)
2533 sdev->host->hostt->unlock_native_capacity(sdev);
2534}
2535
2536/**
2537 * sd_format_disk_name - format disk name
2538 * @prefix: name prefix - ie. "sd" for SCSI disks
2539 * @index: index of the disk to format name for
2540 * @buf: output buffer
2541 * @buflen: length of the output buffer
2542 *
2543 * SCSI disk names starts at sda. The 26th device is sdz and the
2544 * 27th is sdaa. The last one for two lettered suffix is sdzz
2545 * which is followed by sdaaa.
2546 *
2547 * This is basically 26 base counting with one extra 'nil' entry
2548 * at the beginning from the second digit on and can be
2549 * determined using similar method as 26 base conversion with the
2550 * index shifted -1 after each digit is computed.
2551 *
2552 * CONTEXT:
2553 * Don't care.
2554 *
2555 * RETURNS:
2556 * 0 on success, -errno on failure.
2557 */
2558static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2559{
2560 const int base = 'z' - 'a' + 1;
2561 char *begin = buf + strlen(prefix);
2562 char *end = buf + buflen;
2563 char *p;
2564 int unit;
2565
2566 p = end - 1;
2567 *p = '\0';
2568 unit = base;
2569 do {
2570 if (p == begin)
2571 return -EINVAL;
2572 *--p = 'a' + (index % unit);
2573 index = (index / unit) - 1;
2574 } while (index >= 0);
2575
2576 memmove(begin, p, end - p);
2577 memcpy(buf, prefix, strlen(prefix));
2578
2579 return 0;
2580}
2581
2582/*
2583 * The asynchronous part of sd_probe
2584 */
2585static void sd_probe_async(void *data, async_cookie_t cookie)
2586{
2587 struct scsi_disk *sdkp = data;
2588 struct scsi_device *sdp;
2589 struct gendisk *gd;
2590 u32 index;
2591 struct device *dev;
2592
2593 sdp = sdkp->device;
2594 gd = sdkp->disk;
2595 index = sdkp->index;
2596 dev = &sdp->sdev_gendev;
2597
2598 gd->major = sd_major((index & 0xf0) >> 4);
2599 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2600 gd->minors = SD_MINORS;
2601
2602 gd->fops = &sd_fops;
2603 gd->private_data = &sdkp->driver;
2604 gd->queue = sdkp->device->request_queue;
2605
2606 /* defaults, until the device tells us otherwise */
2607 sdp->sector_size = 512;
2608 sdkp->capacity = 0;
2609 sdkp->media_present = 1;
2610 sdkp->write_prot = 0;
2611 sdkp->WCE = 0;
2612 sdkp->RCD = 0;
2613 sdkp->ATO = 0;
2614 sdkp->first_scan = 1;
2615 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2616
2617 sd_revalidate_disk(gd);
2618
2619 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2620 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2621
2622 gd->driverfs_dev = &sdp->sdev_gendev;
2623 gd->flags = GENHD_FL_EXT_DEVT;
2624 if (sdp->removable) {
2625 gd->flags |= GENHD_FL_REMOVABLE;
2626 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2627 }
2628
2629 add_disk(gd);
2630 sd_dif_config_host(sdkp);
2631
2632 sd_revalidate_disk(gd);
2633
2634 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2635 sdp->removable ? "removable " : "");
2636 scsi_autopm_put_device(sdp);
2637 put_device(&sdkp->dev);
2638}
2639
2640/**
2641 * sd_probe - called during driver initialization and whenever a
2642 * new scsi device is attached to the system. It is called once
2643 * for each scsi device (not just disks) present.
2644 * @dev: pointer to device object
2645 *
2646 * Returns 0 if successful (or not interested in this scsi device
2647 * (e.g. scanner)); 1 when there is an error.
2648 *
2649 * Note: this function is invoked from the scsi mid-level.
2650 * This function sets up the mapping between a given
2651 * <host,channel,id,lun> (found in sdp) and new device name
2652 * (e.g. /dev/sda). More precisely it is the block device major
2653 * and minor number that is chosen here.
2654 *
2655 * Assume sd_probe is not re-entrant (for time being)
2656 * Also think about sd_probe() and sd_remove() running coincidentally.
2657 **/
2658static int sd_probe(struct device *dev)
2659{
2660 struct scsi_device *sdp = to_scsi_device(dev);
2661 struct scsi_disk *sdkp;
2662 struct gendisk *gd;
2663 int index;
2664 int error;
2665
2666 error = -ENODEV;
2667 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2668 goto out;
2669
2670 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2671 "sd_probe\n"));
2672
2673 error = -ENOMEM;
2674 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2675 if (!sdkp)
2676 goto out;
2677
2678 gd = alloc_disk(SD_MINORS);
2679 if (!gd)
2680 goto out_free;
2681
2682 do {
2683 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2684 goto out_put;
2685
2686 spin_lock(&sd_index_lock);
2687 error = ida_get_new(&sd_index_ida, &index);
2688 spin_unlock(&sd_index_lock);
2689 } while (error == -EAGAIN);
2690
2691 if (error) {
2692 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2693 goto out_put;
2694 }
2695
2696 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2697 if (error) {
2698 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2699 goto out_free_index;
2700 }
2701
2702 sdkp->device = sdp;
2703 sdkp->driver = &sd_template;
2704 sdkp->disk = gd;
2705 sdkp->index = index;
2706 atomic_set(&sdkp->openers, 0);
2707
2708 if (!sdp->request_queue->rq_timeout) {
2709 if (sdp->type != TYPE_MOD)
2710 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2711 else
2712 blk_queue_rq_timeout(sdp->request_queue,
2713 SD_MOD_TIMEOUT);
2714 }
2715
2716 device_initialize(&sdkp->dev);
2717 sdkp->dev.parent = dev;
2718 sdkp->dev.class = &sd_disk_class;
2719 dev_set_name(&sdkp->dev, dev_name(dev));
2720
2721 if (device_add(&sdkp->dev))
2722 goto out_free_index;
2723
2724 get_device(dev);
2725 dev_set_drvdata(dev, sdkp);
2726
2727 get_device(&sdkp->dev); /* prevent release before async_schedule */
2728 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2729
2730 return 0;
2731
2732 out_free_index:
2733 spin_lock(&sd_index_lock);
2734 ida_remove(&sd_index_ida, index);
2735 spin_unlock(&sd_index_lock);
2736 out_put:
2737 put_disk(gd);
2738 out_free:
2739 kfree(sdkp);
2740 out:
2741 return error;
2742}
2743
2744/**
2745 * sd_remove - called whenever a scsi disk (previously recognized by
2746 * sd_probe) is detached from the system. It is called (potentially
2747 * multiple times) during sd module unload.
2748 * @sdp: pointer to mid level scsi device object
2749 *
2750 * Note: this function is invoked from the scsi mid-level.
2751 * This function potentially frees up a device name (e.g. /dev/sdc)
2752 * that could be re-used by a subsequent sd_probe().
2753 * This function is not called when the built-in sd driver is "exit-ed".
2754 **/
2755static int sd_remove(struct device *dev)
2756{
2757 struct scsi_disk *sdkp;
2758
2759 sdkp = dev_get_drvdata(dev);
2760 scsi_autopm_get_device(sdkp->device);
2761
2762 async_synchronize_full_domain(&scsi_sd_probe_domain);
2763 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2764 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2765 device_del(&sdkp->dev);
2766 del_gendisk(sdkp->disk);
2767 sd_shutdown(dev);
2768
2769 mutex_lock(&sd_ref_mutex);
2770 dev_set_drvdata(dev, NULL);
2771 put_device(&sdkp->dev);
2772 mutex_unlock(&sd_ref_mutex);
2773
2774 return 0;
2775}
2776
2777/**
2778 * scsi_disk_release - Called to free the scsi_disk structure
2779 * @dev: pointer to embedded class device
2780 *
2781 * sd_ref_mutex must be held entering this routine. Because it is
2782 * called on last put, you should always use the scsi_disk_get()
2783 * scsi_disk_put() helpers which manipulate the semaphore directly
2784 * and never do a direct put_device.
2785 **/
2786static void scsi_disk_release(struct device *dev)
2787{
2788 struct scsi_disk *sdkp = to_scsi_disk(dev);
2789 struct gendisk *disk = sdkp->disk;
2790
2791 spin_lock(&sd_index_lock);
2792 ida_remove(&sd_index_ida, sdkp->index);
2793 spin_unlock(&sd_index_lock);
2794
2795 disk->private_data = NULL;
2796 put_disk(disk);
2797 put_device(&sdkp->device->sdev_gendev);
2798
2799 kfree(sdkp);
2800}
2801
2802static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2803{
2804 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2805 struct scsi_sense_hdr sshdr;
2806 struct scsi_device *sdp = sdkp->device;
2807 int res;
2808
2809 if (start)
2810 cmd[4] |= 1; /* START */
2811
2812 if (sdp->start_stop_pwr_cond)
2813 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2814
2815 if (!scsi_device_online(sdp))
2816 return -ENODEV;
2817
2818 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2819 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2820 if (res) {
2821 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2822 sd_print_result(sdkp, res);
2823 if (driver_byte(res) & DRIVER_SENSE)
2824 sd_print_sense_hdr(sdkp, &sshdr);
2825 }
2826
2827 return res;
2828}
2829
2830/*
2831 * Send a SYNCHRONIZE CACHE instruction down to the device through
2832 * the normal SCSI command structure. Wait for the command to
2833 * complete.
2834 */
2835static void sd_shutdown(struct device *dev)
2836{
2837 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2838
2839 if (!sdkp)
2840 return; /* this can happen */
2841
2842 if (pm_runtime_suspended(dev))
2843 goto exit;
2844
2845 if (sdkp->WCE) {
2846 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2847 sd_sync_cache(sdkp);
2848 }
2849
2850 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2851 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2852 sd_start_stop_device(sdkp, 0);
2853 }
2854
2855exit:
2856 scsi_disk_put(sdkp);
2857}
2858
2859static int sd_suspend(struct device *dev, pm_message_t mesg)
2860{
2861 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2862 int ret = 0;
2863
2864 if (!sdkp)
2865 return 0; /* this can happen */
2866
2867 if (sdkp->WCE) {
2868 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2869 ret = sd_sync_cache(sdkp);
2870 if (ret)
2871 goto done;
2872 }
2873
2874 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2875 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2876 ret = sd_start_stop_device(sdkp, 0);
2877 }
2878
2879done:
2880 scsi_disk_put(sdkp);
2881 return ret;
2882}
2883
2884static int sd_resume(struct device *dev)
2885{
2886 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2887 int ret = 0;
2888
2889 if (!sdkp->device->manage_start_stop)
2890 goto done;
2891
2892 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2893 ret = sd_start_stop_device(sdkp, 1);
2894
2895done:
2896 scsi_disk_put(sdkp);
2897 return ret;
2898}
2899
2900/**
2901 * init_sd - entry point for this driver (both when built in or when
2902 * a module).
2903 *
2904 * Note: this function registers this driver with the scsi mid-level.
2905 **/
2906static int __init init_sd(void)
2907{
2908 int majors = 0, i, err;
2909
2910 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2911
2912 for (i = 0; i < SD_MAJORS; i++)
2913 if (register_blkdev(sd_major(i), "sd") == 0)
2914 majors++;
2915
2916 if (!majors)
2917 return -ENODEV;
2918
2919 err = class_register(&sd_disk_class);
2920 if (err)
2921 goto err_out;
2922
2923 err = scsi_register_driver(&sd_template.gendrv);
2924 if (err)
2925 goto err_out_class;
2926
2927 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2928 0, 0, NULL);
2929 if (!sd_cdb_cache) {
2930 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2931 goto err_out_class;
2932 }
2933
2934 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2935 if (!sd_cdb_pool) {
2936 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2937 goto err_out_cache;
2938 }
2939
2940 return 0;
2941
2942err_out_cache:
2943 kmem_cache_destroy(sd_cdb_cache);
2944
2945err_out_class:
2946 class_unregister(&sd_disk_class);
2947err_out:
2948 for (i = 0; i < SD_MAJORS; i++)
2949 unregister_blkdev(sd_major(i), "sd");
2950 return err;
2951}
2952
2953/**
2954 * exit_sd - exit point for this driver (when it is a module).
2955 *
2956 * Note: this function unregisters this driver from the scsi mid-level.
2957 **/
2958static void __exit exit_sd(void)
2959{
2960 int i;
2961
2962 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2963
2964 mempool_destroy(sd_cdb_pool);
2965 kmem_cache_destroy(sd_cdb_cache);
2966
2967 scsi_unregister_driver(&sd_template.gendrv);
2968 class_unregister(&sd_disk_class);
2969
2970 for (i = 0; i < SD_MAJORS; i++)
2971 unregister_blkdev(sd_major(i), "sd");
2972}
2973
2974module_init(init_sd);
2975module_exit(exit_sd);
2976
2977static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2978 struct scsi_sense_hdr *sshdr)
2979{
2980 sd_printk(KERN_INFO, sdkp, " ");
2981 scsi_show_sense_hdr(sshdr);
2982 sd_printk(KERN_INFO, sdkp, " ");
2983 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2984}
2985
2986static void sd_print_result(struct scsi_disk *sdkp, int result)
2987{
2988 sd_printk(KERN_INFO, sdkp, " ");
2989 scsi_show_result(result);
2990}
2991