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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / scsi / sd.c
blobc691fb50e6cbfe75deceddcdf744dc1301cc7d08
1 /*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
56
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
66
67 #include "sd.h"
68 #include "scsi_logging.h"
69
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
73
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
95 #define SD_MINORS 16
96 #else
97 #define SD_MINORS 0
98 #endif
99
100 static void sd_config_discard(struct scsi_disk *, unsigned int);
101 static int sd_revalidate_disk(struct gendisk *);
102 static void sd_unlock_native_capacity(struct gendisk *disk);
103 static int sd_probe(struct device *);
104 static int sd_remove(struct device *);
105 static void sd_shutdown(struct device *);
106 static int sd_suspend(struct device *, pm_message_t state);
107 static int sd_resume(struct device *);
108 static void sd_rescan(struct device *);
109 static int sd_done(struct scsi_cmnd *);
110 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
111 static void scsi_disk_release(struct device *cdev);
112 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
113 static void sd_print_result(struct scsi_disk *, int);
114
115 static DEFINE_SPINLOCK(sd_index_lock);
116 static DEFINE_IDA(sd_index_ida);
117
118 /* This semaphore is used to mediate the 0->1 reference get in the
119 * face of object destruction (i.e. we can't allow a get on an
120 * object after last put) */
121 static DEFINE_MUTEX(sd_ref_mutex);
122
123 static struct kmem_cache *sd_cdb_cache;
124 static mempool_t *sd_cdb_pool;
125
126 static const char *sd_cache_types[] = {
127 "write through", "none", "write back",
128 "write back, no read (daft)"
129 };
130
131 static ssize_t
132 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
133 const char *buf, size_t count)
134 {
135 int i, ct = -1, rcd, wce, sp;
136 struct scsi_disk *sdkp = to_scsi_disk(dev);
137 struct scsi_device *sdp = sdkp->device;
138 char buffer[64];
139 char *buffer_data;
140 struct scsi_mode_data data;
141 struct scsi_sense_hdr sshdr;
142 int len;
143
144 if (sdp->type != TYPE_DISK)
145 /* no cache control on RBC devices; theoretically they
146 * can do it, but there's probably so many exceptions
147 * it's not worth the risk */
148 return -EINVAL;
149
150 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
151 len = strlen(sd_cache_types[i]);
152 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
153 buf[len] == '\n') {
154 ct = i;
155 break;
156 }
157 }
158 if (ct < 0)
159 return -EINVAL;
160 rcd = ct & 0x01 ? 1 : 0;
161 wce = ct & 0x02 ? 1 : 0;
162 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
163 SD_MAX_RETRIES, &data, NULL))
164 return -EINVAL;
165 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
166 data.block_descriptor_length);
167 buffer_data = buffer + data.header_length +
168 data.block_descriptor_length;
169 buffer_data[2] &= ~0x05;
170 buffer_data[2] |= wce << 2 | rcd;
171 sp = buffer_data[0] & 0x80 ? 1 : 0;
172
173 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
174 SD_MAX_RETRIES, &data, &sshdr)) {
175 if (scsi_sense_valid(&sshdr))
176 sd_print_sense_hdr(sdkp, &sshdr);
177 return -EINVAL;
178 }
179 revalidate_disk(sdkp->disk);
180 return count;
181 }
182
183 static ssize_t
184 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
185 const char *buf, size_t count)
186 {
187 struct scsi_disk *sdkp = to_scsi_disk(dev);
188 struct scsi_device *sdp = sdkp->device;
189
190 if (!capable(CAP_SYS_ADMIN))
191 return -EACCES;
192
193 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
194
195 return count;
196 }
197
198 static ssize_t
199 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
200 const char *buf, size_t count)
201 {
202 struct scsi_disk *sdkp = to_scsi_disk(dev);
203 struct scsi_device *sdp = sdkp->device;
204
205 if (!capable(CAP_SYS_ADMIN))
206 return -EACCES;
207
208 if (sdp->type != TYPE_DISK)
209 return -EINVAL;
210
211 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
212
213 return count;
214 }
215
216 static ssize_t
217 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
218 char *buf)
219 {
220 struct scsi_disk *sdkp = to_scsi_disk(dev);
221 int ct = sdkp->RCD + 2*sdkp->WCE;
222
223 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
224 }
225
226 static ssize_t
227 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
228 {
229 struct scsi_disk *sdkp = to_scsi_disk(dev);
230
231 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
232 }
233
234 static ssize_t
235 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
236 char *buf)
237 {
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 struct scsi_device *sdp = sdkp->device;
240
241 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
242 }
243
244 static ssize_t
245 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
246 char *buf)
247 {
248 struct scsi_disk *sdkp = to_scsi_disk(dev);
249
250 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
251 }
252
253 static ssize_t
254 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
255 char *buf)
256 {
257 struct scsi_disk *sdkp = to_scsi_disk(dev);
258
259 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
260 }
261
262 static ssize_t
263 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
264 char *buf)
265 {
266 struct scsi_disk *sdkp = to_scsi_disk(dev);
267 struct scsi_device *sdp = sdkp->device;
268 unsigned int dif, dix;
269
270 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
271 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
272
273 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
274 dif = 0;
275 dix = 1;
276 }
277
278 if (!dif && !dix)
279 return snprintf(buf, 20, "none\n");
280
281 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
282 }
283
284 static ssize_t
285 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
286 char *buf)
287 {
288 struct scsi_disk *sdkp = to_scsi_disk(dev);
289
290 return snprintf(buf, 20, "%u\n", sdkp->ATO);
291 }
292
293 static ssize_t
294 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
295 char *buf)
296 {
297 struct scsi_disk *sdkp = to_scsi_disk(dev);
298
299 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
300 }
301
302 static const char *lbp_mode[] = {
303 [SD_LBP_FULL] = "full",
304 [SD_LBP_UNMAP] = "unmap",
305 [SD_LBP_WS16] = "writesame_16",
306 [SD_LBP_WS10] = "writesame_10",
307 [SD_LBP_ZERO] = "writesame_zero",
308 [SD_LBP_DISABLE] = "disabled",
309 };
310
311 static ssize_t
312 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
313 char *buf)
314 {
315 struct scsi_disk *sdkp = to_scsi_disk(dev);
316
317 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
318 }
319
320 static ssize_t
321 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
322 const char *buf, size_t count)
323 {
324 struct scsi_disk *sdkp = to_scsi_disk(dev);
325 struct scsi_device *sdp = sdkp->device;
326
327 if (!capable(CAP_SYS_ADMIN))
328 return -EACCES;
329
330 if (sdp->type != TYPE_DISK)
331 return -EINVAL;
332
333 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
334 sd_config_discard(sdkp, SD_LBP_UNMAP);
335 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
336 sd_config_discard(sdkp, SD_LBP_WS16);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
338 sd_config_discard(sdkp, SD_LBP_WS10);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
340 sd_config_discard(sdkp, SD_LBP_ZERO);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
342 sd_config_discard(sdkp, SD_LBP_DISABLE);
343 else
344 return -EINVAL;
345
346 return count;
347 }
348
349 static struct device_attribute sd_disk_attrs[] = {
350 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
351 sd_store_cache_type),
352 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
353 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
354 sd_store_allow_restart),
355 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
356 sd_store_manage_start_stop),
357 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
358 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
359 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
360 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
361 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
362 sd_store_provisioning_mode),
363 __ATTR_NULL,
364 };
365
366 static struct class sd_disk_class = {
367 .name = "scsi_disk",
368 .owner = THIS_MODULE,
369 .dev_release = scsi_disk_release,
370 .dev_attrs = sd_disk_attrs,
371 };
372
373 static struct scsi_driver sd_template = {
374 .owner = THIS_MODULE,
375 .gendrv = {
376 .name = "sd",
377 .probe = sd_probe,
378 .remove = sd_remove,
379 .suspend = sd_suspend,
380 .resume = sd_resume,
381 .shutdown = sd_shutdown,
382 },
383 .rescan = sd_rescan,
384 .done = sd_done,
385 };
386
387 /*
388 * Device no to disk mapping:
389 *
390 * major disc2 disc p1
391 * |............|.............|....|....| <- dev_t
392 * 31 20 19 8 7 4 3 0
393 *
394 * Inside a major, we have 16k disks, however mapped non-
395 * contiguously. The first 16 disks are for major0, the next
396 * ones with major1, ... Disk 256 is for major0 again, disk 272
397 * for major1, ...
398 * As we stay compatible with our numbering scheme, we can reuse
399 * the well-know SCSI majors 8, 65--71, 136--143.
400 */
401 static int sd_major(int major_idx)
402 {
403 switch (major_idx) {
404 case 0:
405 return SCSI_DISK0_MAJOR;
406 case 1 ... 7:
407 return SCSI_DISK1_MAJOR + major_idx - 1;
408 case 8 ... 15:
409 return SCSI_DISK8_MAJOR + major_idx - 8;
410 default:
411 BUG();
412 return 0; /* shut up gcc */
413 }
414 }
415
416 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
417 {
418 struct scsi_disk *sdkp = NULL;
419
420 if (disk->private_data) {
421 sdkp = scsi_disk(disk);
422 if (scsi_device_get(sdkp->device) == 0)
423 get_device(&sdkp->dev);
424 else
425 sdkp = NULL;
426 }
427 return sdkp;
428 }
429
430 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
431 {
432 struct scsi_disk *sdkp;
433
434 mutex_lock(&sd_ref_mutex);
435 sdkp = __scsi_disk_get(disk);
436 mutex_unlock(&sd_ref_mutex);
437 return sdkp;
438 }
439
440 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
441 {
442 struct scsi_disk *sdkp;
443
444 mutex_lock(&sd_ref_mutex);
445 sdkp = dev_get_drvdata(dev);
446 if (sdkp)
447 sdkp = __scsi_disk_get(sdkp->disk);
448 mutex_unlock(&sd_ref_mutex);
449 return sdkp;
450 }
451
452 static void scsi_disk_put(struct scsi_disk *sdkp)
453 {
454 struct scsi_device *sdev = sdkp->device;
455
456 mutex_lock(&sd_ref_mutex);
457 put_device(&sdkp->dev);
458 scsi_device_put(sdev);
459 mutex_unlock(&sd_ref_mutex);
460 }
461
462 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
463 {
464 unsigned int prot_op = SCSI_PROT_NORMAL;
465 unsigned int dix = scsi_prot_sg_count(scmd);
466
467 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
468 if (dif && dix)
469 prot_op = SCSI_PROT_READ_PASS;
470 else if (dif && !dix)
471 prot_op = SCSI_PROT_READ_STRIP;
472 else if (!dif && dix)
473 prot_op = SCSI_PROT_READ_INSERT;
474 } else {
475 if (dif && dix)
476 prot_op = SCSI_PROT_WRITE_PASS;
477 else if (dif && !dix)
478 prot_op = SCSI_PROT_WRITE_INSERT;
479 else if (!dif && dix)
480 prot_op = SCSI_PROT_WRITE_STRIP;
481 }
482
483 scsi_set_prot_op(scmd, prot_op);
484 scsi_set_prot_type(scmd, dif);
485 }
486
487 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
488 {
489 struct request_queue *q = sdkp->disk->queue;
490 unsigned int logical_block_size = sdkp->device->sector_size;
491 unsigned int max_blocks = 0;
492
493 q->limits.discard_zeroes_data = sdkp->lbprz;
494 q->limits.discard_alignment = sdkp->unmap_alignment *
495 logical_block_size;
496 q->limits.discard_granularity =
497 max(sdkp->physical_block_size,
498 sdkp->unmap_granularity * logical_block_size);
499
500 switch (mode) {
501
502 case SD_LBP_DISABLE:
503 q->limits.max_discard_sectors = 0;
504 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
505 return;
506
507 case SD_LBP_UNMAP:
508 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
509 break;
510
511 case SD_LBP_WS16:
512 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
513 break;
514
515 case SD_LBP_WS10:
516 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
517 break;
518
519 case SD_LBP_ZERO:
520 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
521 q->limits.discard_zeroes_data = 1;
522 break;
523 }
524
525 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
526 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
527
528 sdkp->provisioning_mode = mode;
529 }
530
531 /**
532 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
533 * @sdp: scsi device to operate one
534 * @rq: Request to prepare
535 *
536 * Will issue either UNMAP or WRITE SAME(16) depending on preference
537 * indicated by target device.
538 **/
539 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
540 {
541 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
542 struct bio *bio = rq->bio;
543 sector_t sector = bio->bi_sector;
544 unsigned int nr_sectors = bio_sectors(bio);
545 unsigned int len;
546 int ret;
547 char *buf;
548 struct page *page;
549
550 if (sdkp->device->sector_size == 4096) {
551 sector >>= 3;
552 nr_sectors >>= 3;
553 }
554
555 rq->timeout = SD_TIMEOUT;
556
557 memset(rq->cmd, 0, rq->cmd_len);
558
559 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
560 if (!page)
561 return BLKPREP_DEFER;
562
563 switch (sdkp->provisioning_mode) {
564 case SD_LBP_UNMAP:
565 buf = page_address(page);
566
567 rq->cmd_len = 10;
568 rq->cmd[0] = UNMAP;
569 rq->cmd[8] = 24;
570
571 put_unaligned_be16(6 + 16, &buf[0]);
572 put_unaligned_be16(16, &buf[2]);
573 put_unaligned_be64(sector, &buf[8]);
574 put_unaligned_be32(nr_sectors, &buf[16]);
575
576 len = 24;
577 break;
578
579 case SD_LBP_WS16:
580 rq->cmd_len = 16;
581 rq->cmd[0] = WRITE_SAME_16;
582 rq->cmd[1] = 0x8; /* UNMAP */
583 put_unaligned_be64(sector, &rq->cmd[2]);
584 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
585
586 len = sdkp->device->sector_size;
587 break;
588
589 case SD_LBP_WS10:
590 case SD_LBP_ZERO:
591 rq->cmd_len = 10;
592 rq->cmd[0] = WRITE_SAME;
593 if (sdkp->provisioning_mode == SD_LBP_WS10)
594 rq->cmd[1] = 0x8; /* UNMAP */
595 put_unaligned_be32(sector, &rq->cmd[2]);
596 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
597
598 len = sdkp->device->sector_size;
599 break;
600
601 default:
602 ret = BLKPREP_KILL;
603 goto out;
604 }
605
606 blk_add_request_payload(rq, page, len);
607 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
608 rq->buffer = page_address(page);
609
610 out:
611 if (ret != BLKPREP_OK) {
612 __free_page(page);
613 rq->buffer = NULL;
614 }
615 return ret;
616 }
617
618 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
619 {
620 rq->timeout = SD_FLUSH_TIMEOUT;
621 rq->retries = SD_MAX_RETRIES;
622 rq->cmd[0] = SYNCHRONIZE_CACHE;
623 rq->cmd_len = 10;
624
625 return scsi_setup_blk_pc_cmnd(sdp, rq);
626 }
627
628 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
629 {
630 if (rq->cmd_flags & REQ_DISCARD) {
631 free_page((unsigned long)rq->buffer);
632 rq->buffer = NULL;
633 }
634 }
635
636 /**
637 * sd_init_command - build a scsi (read or write) command from
638 * information in the request structure.
639 * @SCpnt: pointer to mid-level's per scsi command structure that
640 * contains request and into which the scsi command is written
641 *
642 * Returns 1 if successful and 0 if error (or cannot be done now).
643 **/
644 static int sd_prep_fn(struct request_queue *q, struct request *rq)
645 {
646 struct scsi_cmnd *SCpnt;
647 struct scsi_device *sdp = q->queuedata;
648 struct gendisk *disk = rq->rq_disk;
649 struct scsi_disk *sdkp;
650 sector_t block = blk_rq_pos(rq);
651 sector_t threshold;
652 unsigned int this_count = blk_rq_sectors(rq);
653 int ret, host_dif;
654 unsigned char protect;
655
656 /*
657 * Discard request come in as REQ_TYPE_FS but we turn them into
658 * block PC requests to make life easier.
659 */
660 if (rq->cmd_flags & REQ_DISCARD) {
661 ret = scsi_setup_discard_cmnd(sdp, rq);
662 goto out;
663 } else if (rq->cmd_flags & REQ_FLUSH) {
664 ret = scsi_setup_flush_cmnd(sdp, rq);
665 goto out;
666 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
667 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
668 goto out;
669 } else if (rq->cmd_type != REQ_TYPE_FS) {
670 ret = BLKPREP_KILL;
671 goto out;
672 }
673 ret = scsi_setup_fs_cmnd(sdp, rq);
674 if (ret != BLKPREP_OK)
675 goto out;
676 SCpnt = rq->special;
677 sdkp = scsi_disk(disk);
678
679 /* from here on until we're complete, any goto out
680 * is used for a killable error condition */
681 ret = BLKPREP_KILL;
682
683 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
684 "sd_init_command: block=%llu, "
685 "count=%d\n",
686 (unsigned long long)block,
687 this_count));
688
689 if (!sdp || !scsi_device_online(sdp) ||
690 block + blk_rq_sectors(rq) > get_capacity(disk)) {
691 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
692 "Finishing %u sectors\n",
693 blk_rq_sectors(rq)));
694 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
695 "Retry with 0x%p\n", SCpnt));
696 goto out;
697 }
698
699 if (sdp->changed) {
700 /*
701 * quietly refuse to do anything to a changed disc until
702 * the changed bit has been reset
703 */
704 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
705 goto out;
706 }
707
708 /*
709 * Some SD card readers can't handle multi-sector accesses which touch
710 * the last one or two hardware sectors. Split accesses as needed.
711 */
712 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
713 (sdp->sector_size / 512);
714
715 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
716 if (block < threshold) {
717 /* Access up to the threshold but not beyond */
718 this_count = threshold - block;
719 } else {
720 /* Access only a single hardware sector */
721 this_count = sdp->sector_size / 512;
722 }
723 }
724
725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
726 (unsigned long long)block));
727
728 /*
729 * If we have a 1K hardware sectorsize, prevent access to single
730 * 512 byte sectors. In theory we could handle this - in fact
731 * the scsi cdrom driver must be able to handle this because
732 * we typically use 1K blocksizes, and cdroms typically have
733 * 2K hardware sectorsizes. Of course, things are simpler
734 * with the cdrom, since it is read-only. For performance
735 * reasons, the filesystems should be able to handle this
736 * and not force the scsi disk driver to use bounce buffers
737 * for this.
738 */
739 if (sdp->sector_size == 1024) {
740 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
741 scmd_printk(KERN_ERR, SCpnt,
742 "Bad block number requested\n");
743 goto out;
744 } else {
745 block = block >> 1;
746 this_count = this_count >> 1;
747 }
748 }
749 if (sdp->sector_size == 2048) {
750 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
751 scmd_printk(KERN_ERR, SCpnt,
752 "Bad block number requested\n");
753 goto out;
754 } else {
755 block = block >> 2;
756 this_count = this_count >> 2;
757 }
758 }
759 if (sdp->sector_size == 4096) {
760 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
761 scmd_printk(KERN_ERR, SCpnt,
762 "Bad block number requested\n");
763 goto out;
764 } else {
765 block = block >> 3;
766 this_count = this_count >> 3;
767 }
768 }
769 if (rq_data_dir(rq) == WRITE) {
770 if (!sdp->writeable) {
771 goto out;
772 }
773 SCpnt->cmnd[0] = WRITE_6;
774 SCpnt->sc_data_direction = DMA_TO_DEVICE;
775
776 if (blk_integrity_rq(rq) &&
777 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
778 goto out;
779
780 } else if (rq_data_dir(rq) == READ) {
781 SCpnt->cmnd[0] = READ_6;
782 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
783 } else {
784 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
785 goto out;
786 }
787
788 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
789 "%s %d/%u 512 byte blocks.\n",
790 (rq_data_dir(rq) == WRITE) ?
791 "writing" : "reading", this_count,
792 blk_rq_sectors(rq)));
793
794 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
795 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
796 if (host_dif)
797 protect = 1 << 5;
798 else
799 protect = 0;
800
801 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
802 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
803
804 if (unlikely(SCpnt->cmnd == NULL)) {
805 ret = BLKPREP_DEFER;
806 goto out;
807 }
808
809 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
810 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
811 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
812 SCpnt->cmnd[7] = 0x18;
813 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
814 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
815
816 /* LBA */
817 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
818 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
819 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
820 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
821 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
822 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
823 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
824 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
825
826 /* Expected Indirect LBA */
827 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
828 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
829 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
830 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
831
832 /* Transfer length */
833 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
834 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
835 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
836 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
837 } else if (block > 0xffffffff) {
838 SCpnt->cmnd[0] += READ_16 - READ_6;
839 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
840 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
841 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
842 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
843 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
844 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
845 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
846 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
847 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
848 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
849 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
850 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
851 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
852 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
853 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
854 scsi_device_protection(SCpnt->device) ||
855 SCpnt->device->use_10_for_rw) {
856 if (this_count > 0xffff)
857 this_count = 0xffff;
858
859 SCpnt->cmnd[0] += READ_10 - READ_6;
860 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
861 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
862 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
863 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
864 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
865 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
866 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
868 } else {
869 if (unlikely(rq->cmd_flags & REQ_FUA)) {
870 /*
871 * This happens only if this drive failed
872 * 10byte rw command with ILLEGAL_REQUEST
873 * during operation and thus turned off
874 * use_10_for_rw.
875 */
876 scmd_printk(KERN_ERR, SCpnt,
877 "FUA write on READ/WRITE(6) drive\n");
878 goto out;
879 }
880
881 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
882 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
883 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
884 SCpnt->cmnd[4] = (unsigned char) this_count;
885 SCpnt->cmnd[5] = 0;
886 }
887 SCpnt->sdb.length = this_count * sdp->sector_size;
888
889 /* If DIF or DIX is enabled, tell HBA how to handle request */
890 if (host_dif || scsi_prot_sg_count(SCpnt))
891 sd_prot_op(SCpnt, host_dif);
892
893 /*
894 * We shouldn't disconnect in the middle of a sector, so with a dumb
895 * host adapter, it's safe to assume that we can at least transfer
896 * this many bytes between each connect / disconnect.
897 */
898 SCpnt->transfersize = sdp->sector_size;
899 SCpnt->underflow = this_count << 9;
900 SCpnt->allowed = SD_MAX_RETRIES;
901
902 /*
903 * This indicates that the command is ready from our end to be
904 * queued.
905 */
906 ret = BLKPREP_OK;
907 out:
908 return scsi_prep_return(q, rq, ret);
909 }
910
911 /**
912 * sd_open - open a scsi disk device
913 * @inode: only i_rdev member may be used
914 * @filp: only f_mode and f_flags may be used
915 *
916 * Returns 0 if successful. Returns a negated errno value in case
917 * of error.
918 *
919 * Note: This can be called from a user context (e.g. fsck(1) )
920 * or from within the kernel (e.g. as a result of a mount(1) ).
921 * In the latter case @inode and @filp carry an abridged amount
922 * of information as noted above.
923 *
924 * Locking: called with bdev->bd_mutex held.
925 **/
926 static int sd_open(struct block_device *bdev, fmode_t mode)
927 {
928 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
929 struct scsi_device *sdev;
930 int retval;
931
932 if (!sdkp)
933 return -ENXIO;
934
935 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
936
937 sdev = sdkp->device;
938
939 retval = scsi_autopm_get_device(sdev);
940 if (retval)
941 goto error_autopm;
942
943 /*
944 * If the device is in error recovery, wait until it is done.
945 * If the device is offline, then disallow any access to it.
946 */
947 retval = -ENXIO;
948 if (!scsi_block_when_processing_errors(sdev))
949 goto error_out;
950
951 if (sdev->removable || sdkp->write_prot)
952 check_disk_change(bdev);
953
954 /*
955 * If the drive is empty, just let the open fail.
956 */
957 retval = -ENOMEDIUM;
958 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
959 goto error_out;
960
961 /*
962 * If the device has the write protect tab set, have the open fail
963 * if the user expects to be able to write to the thing.
964 */
965 retval = -EROFS;
966 if (sdkp->write_prot && (mode & FMODE_WRITE))
967 goto error_out;
968
969 /*
970 * It is possible that the disk changing stuff resulted in
971 * the device being taken offline. If this is the case,
972 * report this to the user, and don't pretend that the
973 * open actually succeeded.
974 */
975 retval = -ENXIO;
976 if (!scsi_device_online(sdev))
977 goto error_out;
978
979 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
980 if (scsi_block_when_processing_errors(sdev))
981 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
982 }
983
984 return 0;
985
986 error_out:
987 scsi_autopm_put_device(sdev);
988 error_autopm:
989 scsi_disk_put(sdkp);
990 return retval;
991 }
992
993 /**
994 * sd_release - invoked when the (last) close(2) is called on this
995 * scsi disk.
996 * @inode: only i_rdev member may be used
997 * @filp: only f_mode and f_flags may be used
998 *
999 * Returns 0.
1000 *
1001 * Note: may block (uninterruptible) if error recovery is underway
1002 * on this disk.
1003 *
1004 * Locking: called with bdev->bd_mutex held.
1005 **/
1006 static int sd_release(struct gendisk *disk, fmode_t mode)
1007 {
1008 struct scsi_disk *sdkp = scsi_disk(disk);
1009 struct scsi_device *sdev = sdkp->device;
1010
1011 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1012
1013 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1014 if (scsi_block_when_processing_errors(sdev))
1015 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1016 }
1017
1018 /*
1019 * XXX and what if there are packets in flight and this close()
1020 * XXX is followed by a "rmmod sd_mod"?
1021 */
1022
1023 scsi_autopm_put_device(sdev);
1024 scsi_disk_put(sdkp);
1025 return 0;
1026 }
1027
1028 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1029 {
1030 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1031 struct scsi_device *sdp = sdkp->device;
1032 struct Scsi_Host *host = sdp->host;
1033 int diskinfo[4];
1034
1035 /* default to most commonly used values */
1036 diskinfo[0] = 0x40; /* 1 << 6 */
1037 diskinfo[1] = 0x20; /* 1 << 5 */
1038 diskinfo[2] = sdkp->capacity >> 11;
1039
1040 /* override with calculated, extended default, or driver values */
1041 if (host->hostt->bios_param)
1042 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1043 else
1044 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1045
1046 geo->heads = diskinfo[0];
1047 geo->sectors = diskinfo[1];
1048 geo->cylinders = diskinfo[2];
1049 return 0;
1050 }
1051
1052 /**
1053 * sd_ioctl - process an ioctl
1054 * @inode: only i_rdev/i_bdev members may be used
1055 * @filp: only f_mode and f_flags may be used
1056 * @cmd: ioctl command number
1057 * @arg: this is third argument given to ioctl(2) system call.
1058 * Often contains a pointer.
1059 *
1060 * Returns 0 if successful (some ioctls return positive numbers on
1061 * success as well). Returns a negated errno value in case of error.
1062 *
1063 * Note: most ioctls are forward onto the block subsystem or further
1064 * down in the scsi subsystem.
1065 **/
1066 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1067 unsigned int cmd, unsigned long arg)
1068 {
1069 struct gendisk *disk = bdev->bd_disk;
1070 struct scsi_disk *sdkp = scsi_disk(disk);
1071 struct scsi_device *sdp = sdkp->device;
1072 void __user *p = (void __user *)arg;
1073 int error;
1074
1075 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1076 "cmd=0x%x\n", disk->disk_name, cmd));
1077
1078 error = scsi_verify_blk_ioctl(bdev, cmd);
1079 if (error < 0)
1080 return error;
1081
1082 /*
1083 * If we are in the middle of error recovery, don't let anyone
1084 * else try and use this device. Also, if error recovery fails, it
1085 * may try and take the device offline, in which case all further
1086 * access to the device is prohibited.
1087 */
1088 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1089 (mode & FMODE_NDELAY) != 0);
1090 if (!scsi_block_when_processing_errors(sdp) || !error)
1091 goto out;
1092
1093 /*
1094 * Send SCSI addressing ioctls directly to mid level, send other
1095 * ioctls to block level and then onto mid level if they can't be
1096 * resolved.
1097 */
1098 switch (cmd) {
1099 case SCSI_IOCTL_GET_IDLUN:
1100 case SCSI_IOCTL_GET_BUS_NUMBER:
1101 error = scsi_ioctl(sdp, cmd, p);
1102 break;
1103 default:
1104 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1105 if (error != -ENOTTY)
1106 break;
1107 error = scsi_ioctl(sdp, cmd, p);
1108 break;
1109 }
1110 out:
1111 return error;
1112 }
1113
1114 static void set_media_not_present(struct scsi_disk *sdkp)
1115 {
1116 if (sdkp->media_present)
1117 sdkp->device->changed = 1;
1118
1119 if (sdkp->device->removable) {
1120 sdkp->media_present = 0;
1121 sdkp->capacity = 0;
1122 }
1123 }
1124
1125 static int media_not_present(struct scsi_disk *sdkp,
1126 struct scsi_sense_hdr *sshdr)
1127 {
1128 if (!scsi_sense_valid(sshdr))
1129 return 0;
1130
1131 /* not invoked for commands that could return deferred errors */
1132 switch (sshdr->sense_key) {
1133 case UNIT_ATTENTION:
1134 case NOT_READY:
1135 /* medium not present */
1136 if (sshdr->asc == 0x3A) {
1137 set_media_not_present(sdkp);
1138 return 1;
1139 }
1140 }
1141 return 0;
1142 }
1143
1144 /**
1145 * sd_check_events - check media events
1146 * @disk: kernel device descriptor
1147 * @clearing: disk events currently being cleared
1148 *
1149 * Returns mask of DISK_EVENT_*.
1150 *
1151 * Note: this function is invoked from the block subsystem.
1152 **/
1153 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1154 {
1155 struct scsi_disk *sdkp = scsi_disk(disk);
1156 struct scsi_device *sdp = sdkp->device;
1157 struct scsi_sense_hdr *sshdr = NULL;
1158 int retval;
1159
1160 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1161
1162 /*
1163 * If the device is offline, don't send any commands - just pretend as
1164 * if the command failed. If the device ever comes back online, we
1165 * can deal with it then. It is only because of unrecoverable errors
1166 * that we would ever take a device offline in the first place.
1167 */
1168 if (!scsi_device_online(sdp)) {
1169 set_media_not_present(sdkp);
1170 goto out;
1171 }
1172
1173 /*
1174 * Using TEST_UNIT_READY enables differentiation between drive with
1175 * no cartridge loaded - NOT READY, drive with changed cartridge -
1176 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1177 *
1178 * Drives that auto spin down. eg iomega jaz 1G, will be started
1179 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1180 * sd_revalidate() is called.
1181 */
1182 retval = -ENODEV;
1183
1184 if (scsi_block_when_processing_errors(sdp)) {
1185 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1186 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1187 sshdr);
1188 }
1189
1190 /* failed to execute TUR, assume media not present */
1191 if (host_byte(retval)) {
1192 set_media_not_present(sdkp);
1193 goto out;
1194 }
1195
1196 if (media_not_present(sdkp, sshdr))
1197 goto out;
1198
1199 /*
1200 * For removable scsi disk we have to recognise the presence
1201 * of a disk in the drive.
1202 */
1203 if (!sdkp->media_present)
1204 sdp->changed = 1;
1205 sdkp->media_present = 1;
1206 out:
1207 /*
1208 * sdp->changed is set under the following conditions:
1209 *
1210 * Medium present state has changed in either direction.
1211 * Device has indicated UNIT_ATTENTION.
1212 */
1213 kfree(sshdr);
1214 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1215 sdp->changed = 0;
1216 return retval;
1217 }
1218
1219 static int sd_sync_cache(struct scsi_disk *sdkp)
1220 {
1221 int retries, res;
1222 struct scsi_device *sdp = sdkp->device;
1223 struct scsi_sense_hdr sshdr;
1224
1225 if (!scsi_device_online(sdp))
1226 return -ENODEV;
1227
1228
1229 for (retries = 3; retries > 0; --retries) {
1230 unsigned char cmd[10] = { 0 };
1231
1232 cmd[0] = SYNCHRONIZE_CACHE;
1233 /*
1234 * Leave the rest of the command zero to indicate
1235 * flush everything.
1236 */
1237 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1238 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1239 if (res == 0)
1240 break;
1241 }
1242
1243 if (res) {
1244 sd_print_result(sdkp, res);
1245 if (driver_byte(res) & DRIVER_SENSE)
1246 sd_print_sense_hdr(sdkp, &sshdr);
1247 }
1248
1249 if (res)
1250 return -EIO;
1251 return 0;
1252 }
1253
1254 static void sd_rescan(struct device *dev)
1255 {
1256 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1257
1258 if (sdkp) {
1259 revalidate_disk(sdkp->disk);
1260 scsi_disk_put(sdkp);
1261 }
1262 }
1263
1264
1265 #ifdef CONFIG_COMPAT
1266 /*
1267 * This gets directly called from VFS. When the ioctl
1268 * is not recognized we go back to the other translation paths.
1269 */
1270 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1271 unsigned int cmd, unsigned long arg)
1272 {
1273 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1274 int ret;
1275
1276 ret = scsi_verify_blk_ioctl(bdev, cmd);
1277 if (ret < 0)
1278 return ret;
1279
1280 /*
1281 * If we are in the middle of error recovery, don't let anyone
1282 * else try and use this device. Also, if error recovery fails, it
1283 * may try and take the device offline, in which case all further
1284 * access to the device is prohibited.
1285 */
1286 if (!scsi_block_when_processing_errors(sdev))
1287 return -ENODEV;
1288
1289 if (sdev->host->hostt->compat_ioctl) {
1290 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1291
1292 return ret;
1293 }
1294
1295 /*
1296 * Let the static ioctl translation table take care of it.
1297 */
1298 return -ENOIOCTLCMD;
1299 }
1300 #endif
1301
1302 static const struct block_device_operations sd_fops = {
1303 .owner = THIS_MODULE,
1304 .open = sd_open,
1305 .release = sd_release,
1306 .ioctl = sd_ioctl,
1307 .getgeo = sd_getgeo,
1308 #ifdef CONFIG_COMPAT
1309 .compat_ioctl = sd_compat_ioctl,
1310 #endif
1311 .check_events = sd_check_events,
1312 .revalidate_disk = sd_revalidate_disk,
1313 .unlock_native_capacity = sd_unlock_native_capacity,
1314 };
1315
1316 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1317 {
1318 u64 start_lba = blk_rq_pos(scmd->request);
1319 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1320 u64 bad_lba;
1321 int info_valid;
1322 /*
1323 * resid is optional but mostly filled in. When it's unused,
1324 * its value is zero, so we assume the whole buffer transferred
1325 */
1326 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1327 unsigned int good_bytes;
1328
1329 if (scmd->request->cmd_type != REQ_TYPE_FS)
1330 return 0;
1331
1332 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1333 SCSI_SENSE_BUFFERSIZE,
1334 &bad_lba);
1335 if (!info_valid)
1336 return 0;
1337
1338 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1339 return 0;
1340
1341 if (scmd->device->sector_size < 512) {
1342 /* only legitimate sector_size here is 256 */
1343 start_lba <<= 1;
1344 end_lba <<= 1;
1345 } else {
1346 /* be careful ... don't want any overflows */
1347 u64 factor = scmd->device->sector_size / 512;
1348 do_div(start_lba, factor);
1349 do_div(end_lba, factor);
1350 }
1351
1352 /* The bad lba was reported incorrectly, we have no idea where
1353 * the error is.
1354 */
1355 if (bad_lba < start_lba || bad_lba >= end_lba)
1356 return 0;
1357
1358 /* This computation should always be done in terms of
1359 * the resolution of the device's medium.
1360 */
1361 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1362 return min(good_bytes, transferred);
1363 }
1364
1365 /**
1366 * sd_done - bottom half handler: called when the lower level
1367 * driver has completed (successfully or otherwise) a scsi command.
1368 * @SCpnt: mid-level's per command structure.
1369 *
1370 * Note: potentially run from within an ISR. Must not block.
1371 **/
1372 static int sd_done(struct scsi_cmnd *SCpnt)
1373 {
1374 int result = SCpnt->result;
1375 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1376 struct scsi_sense_hdr sshdr;
1377 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1378 int sense_valid = 0;
1379 int sense_deferred = 0;
1380 unsigned char op = SCpnt->cmnd[0];
1381
1382 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1383 scsi_set_resid(SCpnt, 0);
1384
1385 if (result) {
1386 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1387 if (sense_valid)
1388 sense_deferred = scsi_sense_is_deferred(&sshdr);
1389 }
1390 #ifdef CONFIG_SCSI_LOGGING
1391 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1392 if (sense_valid) {
1393 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1394 "sd_done: sb[respc,sk,asc,"
1395 "ascq]=%x,%x,%x,%x\n",
1396 sshdr.response_code,
1397 sshdr.sense_key, sshdr.asc,
1398 sshdr.ascq));
1399 }
1400 #endif
1401 if (driver_byte(result) != DRIVER_SENSE &&
1402 (!sense_valid || sense_deferred))
1403 goto out;
1404
1405 switch (sshdr.sense_key) {
1406 case HARDWARE_ERROR:
1407 case MEDIUM_ERROR:
1408 good_bytes = sd_completed_bytes(SCpnt);
1409 break;
1410 case RECOVERED_ERROR:
1411 good_bytes = scsi_bufflen(SCpnt);
1412 break;
1413 case NO_SENSE:
1414 /* This indicates a false check condition, so ignore it. An
1415 * unknown amount of data was transferred so treat it as an
1416 * error.
1417 */
1418 scsi_print_sense("sd", SCpnt);
1419 SCpnt->result = 0;
1420 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1421 break;
1422 case ABORTED_COMMAND:
1423 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1424 good_bytes = sd_completed_bytes(SCpnt);
1425 break;
1426 case ILLEGAL_REQUEST:
1427 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1428 good_bytes = sd_completed_bytes(SCpnt);
1429 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1430 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1431 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1432 sd_config_discard(sdkp, SD_LBP_DISABLE);
1433 break;
1434 default:
1435 break;
1436 }
1437 out:
1438 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1439 sd_dif_complete(SCpnt, good_bytes);
1440
1441 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1442 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1443
1444 /* We have to print a failed command here as the
1445 * extended CDB gets freed before scsi_io_completion()
1446 * is called.
1447 */
1448 if (result)
1449 scsi_print_command(SCpnt);
1450
1451 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1452 SCpnt->cmnd = NULL;
1453 SCpnt->cmd_len = 0;
1454 }
1455
1456 return good_bytes;
1457 }
1458
1459 /*
1460 * spinup disk - called only in sd_revalidate_disk()
1461 */
1462 static void
1463 sd_spinup_disk(struct scsi_disk *sdkp)
1464 {
1465 unsigned char cmd[10];
1466 unsigned long spintime_expire = 0;
1467 int retries, spintime;
1468 unsigned int the_result;
1469 struct scsi_sense_hdr sshdr;
1470 int sense_valid = 0;
1471
1472 spintime = 0;
1473
1474 /* Spin up drives, as required. Only do this at boot time */
1475 /* Spinup needs to be done for module loads too. */
1476 do {
1477 retries = 0;
1478
1479 do {
1480 cmd[0] = TEST_UNIT_READY;
1481 memset((void *) &cmd[1], 0, 9);
1482
1483 the_result = scsi_execute_req(sdkp->device, cmd,
1484 DMA_NONE, NULL, 0,
1485 &sshdr, SD_TIMEOUT,
1486 SD_MAX_RETRIES, NULL);
1487
1488 /*
1489 * If the drive has indicated to us that it
1490 * doesn't have any media in it, don't bother
1491 * with any more polling.
1492 */
1493 if (media_not_present(sdkp, &sshdr))
1494 return;
1495
1496 if (the_result)
1497 sense_valid = scsi_sense_valid(&sshdr);
1498 retries++;
1499 } while (retries < 3 &&
1500 (!scsi_status_is_good(the_result) ||
1501 ((driver_byte(the_result) & DRIVER_SENSE) &&
1502 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1503
1504 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1505 /* no sense, TUR either succeeded or failed
1506 * with a status error */
1507 if(!spintime && !scsi_status_is_good(the_result)) {
1508 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1509 sd_print_result(sdkp, the_result);
1510 }
1511 break;
1512 }
1513
1514 /*
1515 * The device does not want the automatic start to be issued.
1516 */
1517 if (sdkp->device->no_start_on_add)
1518 break;
1519
1520 if (sense_valid && sshdr.sense_key == NOT_READY) {
1521 if (sshdr.asc == 4 && sshdr.ascq == 3)
1522 break; /* manual intervention required */
1523 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1524 break; /* standby */
1525 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1526 break; /* unavailable */
1527 /*
1528 * Issue command to spin up drive when not ready
1529 */
1530 if (!spintime) {
1531 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1532 cmd[0] = START_STOP;
1533 cmd[1] = 1; /* Return immediately */
1534 memset((void *) &cmd[2], 0, 8);
1535 cmd[4] = 1; /* Start spin cycle */
1536 if (sdkp->device->start_stop_pwr_cond)
1537 cmd[4] |= 1 << 4;
1538 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1539 NULL, 0, &sshdr,
1540 SD_TIMEOUT, SD_MAX_RETRIES,
1541 NULL);
1542 spintime_expire = jiffies + 100 * HZ;
1543 spintime = 1;
1544 }
1545 /* Wait 1 second for next try */
1546 msleep(1000);
1547 printk(".");
1548
1549 /*
1550 * Wait for USB flash devices with slow firmware.
1551 * Yes, this sense key/ASC combination shouldn't
1552 * occur here. It's characteristic of these devices.
1553 */
1554 } else if (sense_valid &&
1555 sshdr.sense_key == UNIT_ATTENTION &&
1556 sshdr.asc == 0x28) {
1557 if (!spintime) {
1558 spintime_expire = jiffies + 5 * HZ;
1559 spintime = 1;
1560 }
1561 /* Wait 1 second for next try */
1562 msleep(1000);
1563 } else {
1564 /* we don't understand the sense code, so it's
1565 * probably pointless to loop */
1566 if(!spintime) {
1567 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1568 sd_print_sense_hdr(sdkp, &sshdr);
1569 }
1570 break;
1571 }
1572
1573 } while (spintime && time_before_eq(jiffies, spintime_expire));
1574
1575 if (spintime) {
1576 if (scsi_status_is_good(the_result))
1577 printk("ready\n");
1578 else
1579 printk("not responding...\n");
1580 }
1581 }
1582
1583
1584 /*
1585 * Determine whether disk supports Data Integrity Field.
1586 */
1587 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1588 {
1589 struct scsi_device *sdp = sdkp->device;
1590 u8 type;
1591
1592 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1593 return;
1594
1595 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1596
1597 if (type == sdkp->protection_type || !sdkp->first_scan)
1598 return;
1599
1600 sdkp->protection_type = type;
1601
1602 if (type > SD_DIF_TYPE3_PROTECTION) {
1603 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1604 "protection type %u. Disabling disk!\n", type);
1605 sdkp->capacity = 0;
1606 return;
1607 }
1608
1609 if (scsi_host_dif_capable(sdp->host, type))
1610 sd_printk(KERN_NOTICE, sdkp,
1611 "Enabling DIF Type %u protection\n", type);
1612 else
1613 sd_printk(KERN_NOTICE, sdkp,
1614 "Disabling DIF Type %u protection\n", type);
1615 }
1616
1617 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1618 struct scsi_sense_hdr *sshdr, int sense_valid,
1619 int the_result)
1620 {
1621 sd_print_result(sdkp, the_result);
1622 if (driver_byte(the_result) & DRIVER_SENSE)
1623 sd_print_sense_hdr(sdkp, sshdr);
1624 else
1625 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1626
1627 /*
1628 * Set dirty bit for removable devices if not ready -
1629 * sometimes drives will not report this properly.
1630 */
1631 if (sdp->removable &&
1632 sense_valid && sshdr->sense_key == NOT_READY)
1633 set_media_not_present(sdkp);
1634
1635 /*
1636 * We used to set media_present to 0 here to indicate no media
1637 * in the drive, but some drives fail read capacity even with
1638 * media present, so we can't do that.
1639 */
1640 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1641 }
1642
1643 #define RC16_LEN 32
1644 #if RC16_LEN > SD_BUF_SIZE
1645 #error RC16_LEN must not be more than SD_BUF_SIZE
1646 #endif
1647
1648 #define READ_CAPACITY_RETRIES_ON_RESET 10
1649
1650 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1651 unsigned char *buffer)
1652 {
1653 unsigned char cmd[16];
1654 struct scsi_sense_hdr sshdr;
1655 int sense_valid = 0;
1656 int the_result;
1657 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1658 unsigned int alignment;
1659 unsigned long long lba;
1660 unsigned sector_size;
1661
1662 if (sdp->no_read_capacity_16)
1663 return -EINVAL;
1664
1665 do {
1666 memset(cmd, 0, 16);
1667 cmd[0] = SERVICE_ACTION_IN;
1668 cmd[1] = SAI_READ_CAPACITY_16;
1669 cmd[13] = RC16_LEN;
1670 memset(buffer, 0, RC16_LEN);
1671
1672 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1673 buffer, RC16_LEN, &sshdr,
1674 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1675
1676 if (media_not_present(sdkp, &sshdr))
1677 return -ENODEV;
1678
1679 if (the_result) {
1680 sense_valid = scsi_sense_valid(&sshdr);
1681 if (sense_valid &&
1682 sshdr.sense_key == ILLEGAL_REQUEST &&
1683 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1684 sshdr.ascq == 0x00)
1685 /* Invalid Command Operation Code or
1686 * Invalid Field in CDB, just retry
1687 * silently with RC10 */
1688 return -EINVAL;
1689 if (sense_valid &&
1690 sshdr.sense_key == UNIT_ATTENTION &&
1691 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1692 /* Device reset might occur several times,
1693 * give it one more chance */
1694 if (--reset_retries > 0)
1695 continue;
1696 }
1697 retries--;
1698
1699 } while (the_result && retries);
1700
1701 if (the_result) {
1702 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1703 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1704 return -EINVAL;
1705 }
1706
1707 sector_size = get_unaligned_be32(&buffer[8]);
1708 lba = get_unaligned_be64(&buffer[0]);
1709
1710 sd_read_protection_type(sdkp, buffer);
1711
1712 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1713 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1714 "kernel compiled with support for large block "
1715 "devices.\n");
1716 sdkp->capacity = 0;
1717 return -EOVERFLOW;
1718 }
1719
1720 /* Logical blocks per physical block exponent */
1721 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1722
1723 /* Lowest aligned logical block */
1724 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1725 blk_queue_alignment_offset(sdp->request_queue, alignment);
1726 if (alignment && sdkp->first_scan)
1727 sd_printk(KERN_NOTICE, sdkp,
1728 "physical block alignment offset: %u\n", alignment);
1729
1730 if (buffer[14] & 0x80) { /* LBPME */
1731 sdkp->lbpme = 1;
1732
1733 if (buffer[14] & 0x40) /* LBPRZ */
1734 sdkp->lbprz = 1;
1735
1736 sd_config_discard(sdkp, SD_LBP_WS16);
1737 }
1738
1739 sdkp->capacity = lba + 1;
1740 return sector_size;
1741 }
1742
1743 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1744 unsigned char *buffer)
1745 {
1746 unsigned char cmd[16];
1747 struct scsi_sense_hdr sshdr;
1748 int sense_valid = 0;
1749 int the_result;
1750 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1751 sector_t lba;
1752 unsigned sector_size;
1753
1754 do {
1755 cmd[0] = READ_CAPACITY;
1756 memset(&cmd[1], 0, 9);
1757 memset(buffer, 0, 8);
1758
1759 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1760 buffer, 8, &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 == UNIT_ATTENTION &&
1770 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1771 /* Device reset might occur several times,
1772 * give it one more chance */
1773 if (--reset_retries > 0)
1774 continue;
1775 }
1776 retries--;
1777
1778 } while (the_result && retries);
1779
1780 if (the_result) {
1781 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1782 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1783 return -EINVAL;
1784 }
1785
1786 sector_size = get_unaligned_be32(&buffer[4]);
1787 lba = get_unaligned_be32(&buffer[0]);
1788
1789 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1790 /* Some buggy (usb cardreader) devices return an lba of
1791 0xffffffff when the want to report a size of 0 (with
1792 which they really mean no media is present) */
1793 sdkp->capacity = 0;
1794 sdkp->physical_block_size = sector_size;
1795 return sector_size;
1796 }
1797
1798 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1799 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1800 "kernel compiled with support for large block "
1801 "devices.\n");
1802 sdkp->capacity = 0;
1803 return -EOVERFLOW;
1804 }
1805
1806 sdkp->capacity = lba + 1;
1807 sdkp->physical_block_size = sector_size;
1808 return sector_size;
1809 }
1810
1811 static int sd_try_rc16_first(struct scsi_device *sdp)
1812 {
1813 if (sdp->host->max_cmd_len < 16)
1814 return 0;
1815 if (sdp->scsi_level > SCSI_SPC_2)
1816 return 1;
1817 if (scsi_device_protection(sdp))
1818 return 1;
1819 return 0;
1820 }
1821
1822 /*
1823 * read disk capacity
1824 */
1825 static void
1826 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1827 {
1828 int sector_size;
1829 struct scsi_device *sdp = sdkp->device;
1830 sector_t old_capacity = sdkp->capacity;
1831
1832 if (sd_try_rc16_first(sdp)) {
1833 sector_size = read_capacity_16(sdkp, sdp, buffer);
1834 if (sector_size == -EOVERFLOW)
1835 goto got_data;
1836 if (sector_size == -ENODEV)
1837 return;
1838 if (sector_size < 0)
1839 sector_size = read_capacity_10(sdkp, sdp, buffer);
1840 if (sector_size < 0)
1841 return;
1842 } else {
1843 sector_size = read_capacity_10(sdkp, sdp, buffer);
1844 if (sector_size == -EOVERFLOW)
1845 goto got_data;
1846 if (sector_size < 0)
1847 return;
1848 if ((sizeof(sdkp->capacity) > 4) &&
1849 (sdkp->capacity > 0xffffffffULL)) {
1850 int old_sector_size = sector_size;
1851 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1852 "Trying to use READ CAPACITY(16).\n");
1853 sector_size = read_capacity_16(sdkp, sdp, buffer);
1854 if (sector_size < 0) {
1855 sd_printk(KERN_NOTICE, sdkp,
1856 "Using 0xffffffff as device size\n");
1857 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1858 sector_size = old_sector_size;
1859 goto got_data;
1860 }
1861 }
1862 }
1863
1864 /* Some devices are known to return the total number of blocks,
1865 * not the highest block number. Some devices have versions
1866 * which do this and others which do not. Some devices we might
1867 * suspect of doing this but we don't know for certain.
1868 *
1869 * If we know the reported capacity is wrong, decrement it. If
1870 * we can only guess, then assume the number of blocks is even
1871 * (usually true but not always) and err on the side of lowering
1872 * the capacity.
1873 */
1874 if (sdp->fix_capacity ||
1875 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1876 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1877 "from its reported value: %llu\n",
1878 (unsigned long long) sdkp->capacity);
1879 --sdkp->capacity;
1880 }
1881
1882 got_data:
1883 if (sector_size == 0) {
1884 sector_size = 512;
1885 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1886 "assuming 512.\n");
1887 }
1888
1889 if (sector_size != 512 &&
1890 sector_size != 1024 &&
1891 sector_size != 2048 &&
1892 sector_size != 4096 &&
1893 sector_size != 256) {
1894 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1895 sector_size);
1896 /*
1897 * The user might want to re-format the drive with
1898 * a supported sectorsize. Once this happens, it
1899 * would be relatively trivial to set the thing up.
1900 * For this reason, we leave the thing in the table.
1901 */
1902 sdkp->capacity = 0;
1903 /*
1904 * set a bogus sector size so the normal read/write
1905 * logic in the block layer will eventually refuse any
1906 * request on this device without tripping over power
1907 * of two sector size assumptions
1908 */
1909 sector_size = 512;
1910 }
1911 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1912
1913 {
1914 char cap_str_2[10], cap_str_10[10];
1915 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1916
1917 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1918 sizeof(cap_str_2));
1919 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1920 sizeof(cap_str_10));
1921
1922 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1923 sd_printk(KERN_NOTICE, sdkp,
1924 "%llu %d-byte logical blocks: (%s/%s)\n",
1925 (unsigned long long)sdkp->capacity,
1926 sector_size, cap_str_10, cap_str_2);
1927
1928 if (sdkp->physical_block_size != sector_size)
1929 sd_printk(KERN_NOTICE, sdkp,
1930 "%u-byte physical blocks\n",
1931 sdkp->physical_block_size);
1932 }
1933 }
1934
1935 /* Rescale capacity to 512-byte units */
1936 if (sector_size == 4096)
1937 sdkp->capacity <<= 3;
1938 else if (sector_size == 2048)
1939 sdkp->capacity <<= 2;
1940 else if (sector_size == 1024)
1941 sdkp->capacity <<= 1;
1942 else if (sector_size == 256)
1943 sdkp->capacity >>= 1;
1944
1945 blk_queue_physical_block_size(sdp->request_queue,
1946 sdkp->physical_block_size);
1947 sdkp->device->sector_size = sector_size;
1948 }
1949
1950 /* called with buffer of length 512 */
1951 static inline int
1952 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1953 unsigned char *buffer, int len, struct scsi_mode_data *data,
1954 struct scsi_sense_hdr *sshdr)
1955 {
1956 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1957 SD_TIMEOUT, SD_MAX_RETRIES, data,
1958 sshdr);
1959 }
1960
1961 /*
1962 * read write protect setting, if possible - called only in sd_revalidate_disk()
1963 * called with buffer of length SD_BUF_SIZE
1964 */
1965 static void
1966 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1967 {
1968 int res;
1969 struct scsi_device *sdp = sdkp->device;
1970 struct scsi_mode_data data;
1971 int old_wp = sdkp->write_prot;
1972
1973 set_disk_ro(sdkp->disk, 0);
1974 if (sdp->skip_ms_page_3f) {
1975 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1976 return;
1977 }
1978
1979 if (sdp->use_192_bytes_for_3f) {
1980 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1981 } else {
1982 /*
1983 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1984 * We have to start carefully: some devices hang if we ask
1985 * for more than is available.
1986 */
1987 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1988
1989 /*
1990 * Second attempt: ask for page 0 When only page 0 is
1991 * implemented, a request for page 3F may return Sense Key
1992 * 5: Illegal Request, Sense Code 24: Invalid field in
1993 * CDB.
1994 */
1995 if (!scsi_status_is_good(res))
1996 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1997
1998 /*
1999 * Third attempt: ask 255 bytes, as we did earlier.
2000 */
2001 if (!scsi_status_is_good(res))
2002 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2003 &data, NULL);
2004 }
2005
2006 if (!scsi_status_is_good(res)) {
2007 sd_printk(KERN_WARNING, sdkp,
2008 "Test WP failed, assume Write Enabled\n");
2009 } else {
2010 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2011 set_disk_ro(sdkp->disk, sdkp->write_prot);
2012 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2013 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2014 sdkp->write_prot ? "on" : "off");
2015 sd_printk(KERN_DEBUG, sdkp,
2016 "Mode Sense: %02x %02x %02x %02x\n",
2017 buffer[0], buffer[1], buffer[2], buffer[3]);
2018 }
2019 }
2020 }
2021
2022 /*
2023 * sd_read_cache_type - called only from sd_revalidate_disk()
2024 * called with buffer of length SD_BUF_SIZE
2025 */
2026 static void
2027 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2028 {
2029 int len = 0, res;
2030 struct scsi_device *sdp = sdkp->device;
2031
2032 int dbd;
2033 int modepage;
2034 int first_len;
2035 struct scsi_mode_data data;
2036 struct scsi_sense_hdr sshdr;
2037 int old_wce = sdkp->WCE;
2038 int old_rcd = sdkp->RCD;
2039 int old_dpofua = sdkp->DPOFUA;
2040
2041 first_len = 4;
2042 if (sdp->skip_ms_page_8) {
2043 if (sdp->type == TYPE_RBC)
2044 goto defaults;
2045 else {
2046 if (sdp->skip_ms_page_3f)
2047 goto defaults;
2048 modepage = 0x3F;
2049 if (sdp->use_192_bytes_for_3f)
2050 first_len = 192;
2051 dbd = 0;
2052 }
2053 } else if (sdp->type == TYPE_RBC) {
2054 modepage = 6;
2055 dbd = 8;
2056 } else {
2057 modepage = 8;
2058 dbd = 0;
2059 }
2060
2061 /* cautiously ask */
2062 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2063 &data, &sshdr);
2064
2065 if (!scsi_status_is_good(res))
2066 goto bad_sense;
2067
2068 if (!data.header_length) {
2069 modepage = 6;
2070 first_len = 0;
2071 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2072 }
2073
2074 /* that went OK, now ask for the proper length */
2075 len = data.length;
2076
2077 /*
2078 * We're only interested in the first three bytes, actually.
2079 * But the data cache page is defined for the first 20.
2080 */
2081 if (len < 3)
2082 goto bad_sense;
2083 else if (len > SD_BUF_SIZE) {
2084 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2085 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2086 len = SD_BUF_SIZE;
2087 }
2088 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2089 len = 192;
2090
2091 /* Get the data */
2092 if (len > first_len)
2093 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2094 &data, &sshdr);
2095
2096 if (scsi_status_is_good(res)) {
2097 int offset = data.header_length + data.block_descriptor_length;
2098
2099 while (offset < len) {
2100 u8 page_code = buffer[offset] & 0x3F;
2101 u8 spf = buffer[offset] & 0x40;
2102
2103 if (page_code == 8 || page_code == 6) {
2104 /* We're interested only in the first 3 bytes.
2105 */
2106 if (len - offset <= 2) {
2107 sd_printk(KERN_ERR, sdkp, "Incomplete "
2108 "mode parameter data\n");
2109 goto defaults;
2110 } else {
2111 modepage = page_code;
2112 goto Page_found;
2113 }
2114 } else {
2115 /* Go to the next page */
2116 if (spf && len - offset > 3)
2117 offset += 4 + (buffer[offset+2] << 8) +
2118 buffer[offset+3];
2119 else if (!spf && len - offset > 1)
2120 offset += 2 + buffer[offset+1];
2121 else {
2122 sd_printk(KERN_ERR, sdkp, "Incomplete "
2123 "mode parameter data\n");
2124 goto defaults;
2125 }
2126 }
2127 }
2128
2129 if (modepage == 0x3F) {
2130 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2131 "present\n");
2132 goto defaults;
2133 } else if ((buffer[offset] & 0x3f) != modepage) {
2134 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2135 goto defaults;
2136 }
2137 Page_found:
2138 if (modepage == 8) {
2139 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2140 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2141 } else {
2142 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2143 sdkp->RCD = 0;
2144 }
2145
2146 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2147 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2148 sd_printk(KERN_NOTICE, sdkp,
2149 "Uses READ/WRITE(6), disabling FUA\n");
2150 sdkp->DPOFUA = 0;
2151 }
2152
2153 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2154 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2155 sd_printk(KERN_NOTICE, sdkp,
2156 "Write cache: %s, read cache: %s, %s\n",
2157 sdkp->WCE ? "enabled" : "disabled",
2158 sdkp->RCD ? "disabled" : "enabled",
2159 sdkp->DPOFUA ? "supports DPO and FUA"
2160 : "doesn't support DPO or FUA");
2161
2162 return;
2163 }
2164
2165 bad_sense:
2166 if (scsi_sense_valid(&sshdr) &&
2167 sshdr.sense_key == ILLEGAL_REQUEST &&
2168 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2169 /* Invalid field in CDB */
2170 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2171 else
2172 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2173
2174 defaults:
2175 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2176 sdkp->WCE = 0;
2177 sdkp->RCD = 0;
2178 sdkp->DPOFUA = 0;
2179 }
2180
2181 /*
2182 * The ATO bit indicates whether the DIF application tag is available
2183 * for use by the operating system.
2184 */
2185 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2186 {
2187 int res, offset;
2188 struct scsi_device *sdp = sdkp->device;
2189 struct scsi_mode_data data;
2190 struct scsi_sense_hdr sshdr;
2191
2192 if (sdp->type != TYPE_DISK)
2193 return;
2194
2195 if (sdkp->protection_type == 0)
2196 return;
2197
2198 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2199 SD_MAX_RETRIES, &data, &sshdr);
2200
2201 if (!scsi_status_is_good(res) || !data.header_length ||
2202 data.length < 6) {
2203 sd_printk(KERN_WARNING, sdkp,
2204 "getting Control mode page failed, assume no ATO\n");
2205
2206 if (scsi_sense_valid(&sshdr))
2207 sd_print_sense_hdr(sdkp, &sshdr);
2208
2209 return;
2210 }
2211
2212 offset = data.header_length + data.block_descriptor_length;
2213
2214 if ((buffer[offset] & 0x3f) != 0x0a) {
2215 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2216 return;
2217 }
2218
2219 if ((buffer[offset + 5] & 0x80) == 0)
2220 return;
2221
2222 sdkp->ATO = 1;
2223
2224 return;
2225 }
2226
2227 /**
2228 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2229 * @disk: disk to query
2230 */
2231 static void sd_read_block_limits(struct scsi_disk *sdkp)
2232 {
2233 unsigned int sector_sz = sdkp->device->sector_size;
2234 const int vpd_len = 64;
2235 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2236
2237 if (!buffer ||
2238 /* Block Limits VPD */
2239 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2240 goto out;
2241
2242 blk_queue_io_min(sdkp->disk->queue,
2243 get_unaligned_be16(&buffer[6]) * sector_sz);
2244 blk_queue_io_opt(sdkp->disk->queue,
2245 get_unaligned_be32(&buffer[12]) * sector_sz);
2246
2247 if (buffer[3] == 0x3c) {
2248 unsigned int lba_count, desc_count;
2249
2250 sdkp->max_ws_blocks =
2251 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2252 (u64)0xffffffff);
2253
2254 if (!sdkp->lbpme)
2255 goto out;
2256
2257 lba_count = get_unaligned_be32(&buffer[20]);
2258 desc_count = get_unaligned_be32(&buffer[24]);
2259
2260 if (lba_count && desc_count)
2261 sdkp->max_unmap_blocks = lba_count;
2262
2263 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2264
2265 if (buffer[32] & 0x80)
2266 sdkp->unmap_alignment =
2267 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2268
2269 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2270
2271 if (sdkp->max_unmap_blocks)
2272 sd_config_discard(sdkp, SD_LBP_UNMAP);
2273 else
2274 sd_config_discard(sdkp, SD_LBP_WS16);
2275
2276 } else { /* LBP VPD page tells us what to use */
2277
2278 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2279 sd_config_discard(sdkp, SD_LBP_UNMAP);
2280 else if (sdkp->lbpws)
2281 sd_config_discard(sdkp, SD_LBP_WS16);
2282 else if (sdkp->lbpws10)
2283 sd_config_discard(sdkp, SD_LBP_WS10);
2284 else
2285 sd_config_discard(sdkp, SD_LBP_DISABLE);
2286 }
2287 }
2288
2289 out:
2290 kfree(buffer);
2291 }
2292
2293 /**
2294 * sd_read_block_characteristics - Query block dev. characteristics
2295 * @disk: disk to query
2296 */
2297 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2298 {
2299 unsigned char *buffer;
2300 u16 rot;
2301 const int vpd_len = 64;
2302
2303 buffer = kmalloc(vpd_len, GFP_KERNEL);
2304
2305 if (!buffer ||
2306 /* Block Device Characteristics VPD */
2307 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2308 goto out;
2309
2310 rot = get_unaligned_be16(&buffer[4]);
2311
2312 if (rot == 1)
2313 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2314
2315 out:
2316 kfree(buffer);
2317 }
2318
2319 /**
2320 * sd_read_block_provisioning - Query provisioning VPD page
2321 * @disk: disk to query
2322 */
2323 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2324 {
2325 unsigned char *buffer;
2326 const int vpd_len = 8;
2327
2328 if (sdkp->lbpme == 0)
2329 return;
2330
2331 buffer = kmalloc(vpd_len, GFP_KERNEL);
2332
2333 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2334 goto out;
2335
2336 sdkp->lbpvpd = 1;
2337 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2338 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2339 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2340
2341 out:
2342 kfree(buffer);
2343 }
2344
2345 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2346 {
2347 /*
2348 * Although VPD inquiries can go to SCSI-2 type devices,
2349 * some USB ones crash on receiving them, and the pages
2350 * we currently ask for are for SPC-3 and beyond
2351 */
2352 if (sdp->scsi_level > SCSI_SPC_2)
2353 return 1;
2354 return 0;
2355 }
2356
2357 /**
2358 * sd_revalidate_disk - called the first time a new disk is seen,
2359 * performs disk spin up, read_capacity, etc.
2360 * @disk: struct gendisk we care about
2361 **/
2362 static int sd_revalidate_disk(struct gendisk *disk)
2363 {
2364 struct scsi_disk *sdkp = scsi_disk(disk);
2365 struct scsi_device *sdp = sdkp->device;
2366 unsigned char *buffer;
2367 unsigned flush = 0;
2368
2369 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2370 "sd_revalidate_disk\n"));
2371
2372 /*
2373 * If the device is offline, don't try and read capacity or any
2374 * of the other niceties.
2375 */
2376 if (!scsi_device_online(sdp))
2377 goto out;
2378
2379 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2380 if (!buffer) {
2381 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2382 "allocation failure.\n");
2383 goto out;
2384 }
2385
2386 sd_spinup_disk(sdkp);
2387
2388 /*
2389 * Without media there is no reason to ask; moreover, some devices
2390 * react badly if we do.
2391 */
2392 if (sdkp->media_present) {
2393 sd_read_capacity(sdkp, buffer);
2394
2395 if (sd_try_extended_inquiry(sdp)) {
2396 sd_read_block_provisioning(sdkp);
2397 sd_read_block_limits(sdkp);
2398 sd_read_block_characteristics(sdkp);
2399 }
2400
2401 sd_read_write_protect_flag(sdkp, buffer);
2402 sd_read_cache_type(sdkp, buffer);
2403 sd_read_app_tag_own(sdkp, buffer);
2404 }
2405
2406 sdkp->first_scan = 0;
2407
2408 /*
2409 * We now have all cache related info, determine how we deal
2410 * with flush requests.
2411 */
2412 if (sdkp->WCE) {
2413 flush |= REQ_FLUSH;
2414 if (sdkp->DPOFUA)
2415 flush |= REQ_FUA;
2416 }
2417
2418 blk_queue_flush(sdkp->disk->queue, flush);
2419
2420 set_capacity(disk, sdkp->capacity);
2421 kfree(buffer);
2422
2423 out:
2424 return 0;
2425 }
2426
2427 /**
2428 * sd_unlock_native_capacity - unlock native capacity
2429 * @disk: struct gendisk to set capacity for
2430 *
2431 * Block layer calls this function if it detects that partitions
2432 * on @disk reach beyond the end of the device. If the SCSI host
2433 * implements ->unlock_native_capacity() method, it's invoked to
2434 * give it a chance to adjust the device capacity.
2435 *
2436 * CONTEXT:
2437 * Defined by block layer. Might sleep.
2438 */
2439 static void sd_unlock_native_capacity(struct gendisk *disk)
2440 {
2441 struct scsi_device *sdev = scsi_disk(disk)->device;
2442
2443 if (sdev->host->hostt->unlock_native_capacity)
2444 sdev->host->hostt->unlock_native_capacity(sdev);
2445 }
2446
2447 /**
2448 * sd_format_disk_name - format disk name
2449 * @prefix: name prefix - ie. "sd" for SCSI disks
2450 * @index: index of the disk to format name for
2451 * @buf: output buffer
2452 * @buflen: length of the output buffer
2453 *
2454 * SCSI disk names starts at sda. The 26th device is sdz and the
2455 * 27th is sdaa. The last one for two lettered suffix is sdzz
2456 * which is followed by sdaaa.
2457 *
2458 * This is basically 26 base counting with one extra 'nil' entry
2459 * at the beginning from the second digit on and can be
2460 * determined using similar method as 26 base conversion with the
2461 * index shifted -1 after each digit is computed.
2462 *
2463 * CONTEXT:
2464 * Don't care.
2465 *
2466 * RETURNS:
2467 * 0 on success, -errno on failure.
2468 */
2469 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2470 {
2471 const int base = 'z' - 'a' + 1;
2472 char *begin = buf + strlen(prefix);
2473 char *end = buf + buflen;
2474 char *p;
2475 int unit;
2476
2477 p = end - 1;
2478 *p = '\0';
2479 unit = base;
2480 do {
2481 if (p == begin)
2482 return -EINVAL;
2483 *--p = 'a' + (index % unit);
2484 index = (index / unit) - 1;
2485 } while (index >= 0);
2486
2487 memmove(begin, p, end - p);
2488 memcpy(buf, prefix, strlen(prefix));
2489
2490 return 0;
2491 }
2492
2493 /*
2494 * The asynchronous part of sd_probe
2495 */
2496 static void sd_probe_async(void *data, async_cookie_t cookie)
2497 {
2498 struct scsi_disk *sdkp = data;
2499 struct scsi_device *sdp;
2500 struct gendisk *gd;
2501 u32 index;
2502 struct device *dev;
2503
2504 sdp = sdkp->device;
2505 gd = sdkp->disk;
2506 index = sdkp->index;
2507 dev = &sdp->sdev_gendev;
2508
2509 gd->major = sd_major((index & 0xf0) >> 4);
2510 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2511 gd->minors = SD_MINORS;
2512
2513 gd->fops = &sd_fops;
2514 gd->private_data = &sdkp->driver;
2515 gd->queue = sdkp->device->request_queue;
2516
2517 /* defaults, until the device tells us otherwise */
2518 sdp->sector_size = 512;
2519 sdkp->capacity = 0;
2520 sdkp->media_present = 1;
2521 sdkp->write_prot = 0;
2522 sdkp->WCE = 0;
2523 sdkp->RCD = 0;
2524 sdkp->ATO = 0;
2525 sdkp->first_scan = 1;
2526
2527 sd_revalidate_disk(gd);
2528
2529 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2530 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2531
2532 gd->driverfs_dev = &sdp->sdev_gendev;
2533 gd->flags = GENHD_FL_EXT_DEVT;
2534 if (sdp->removable) {
2535 gd->flags |= GENHD_FL_REMOVABLE;
2536 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2537 }
2538
2539 add_disk(gd);
2540 sd_dif_config_host(sdkp);
2541
2542 sd_revalidate_disk(gd);
2543
2544 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2545 sdp->removable ? "removable " : "");
2546 scsi_autopm_put_device(sdp);
2547 put_device(&sdkp->dev);
2548 }
2549
2550 /**
2551 * sd_probe - called during driver initialization and whenever a
2552 * new scsi device is attached to the system. It is called once
2553 * for each scsi device (not just disks) present.
2554 * @dev: pointer to device object
2555 *
2556 * Returns 0 if successful (or not interested in this scsi device
2557 * (e.g. scanner)); 1 when there is an error.
2558 *
2559 * Note: this function is invoked from the scsi mid-level.
2560 * This function sets up the mapping between a given
2561 * <host,channel,id,lun> (found in sdp) and new device name
2562 * (e.g. /dev/sda). More precisely it is the block device major
2563 * and minor number that is chosen here.
2564 *
2565 * Assume sd_attach is not re-entrant (for time being)
2566 * Also think about sd_attach() and sd_remove() running coincidentally.
2567 **/
2568 static int sd_probe(struct device *dev)
2569 {
2570 struct scsi_device *sdp = to_scsi_device(dev);
2571 struct scsi_disk *sdkp;
2572 struct gendisk *gd;
2573 int index;
2574 int error;
2575
2576 error = -ENODEV;
2577 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2578 goto out;
2579
2580 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2581 "sd_attach\n"));
2582
2583 error = -ENOMEM;
2584 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2585 if (!sdkp)
2586 goto out;
2587
2588 gd = alloc_disk(SD_MINORS);
2589 if (!gd)
2590 goto out_free;
2591
2592 do {
2593 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2594 goto out_put;
2595
2596 spin_lock(&sd_index_lock);
2597 error = ida_get_new(&sd_index_ida, &index);
2598 spin_unlock(&sd_index_lock);
2599 } while (error == -EAGAIN);
2600
2601 if (error) {
2602 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2603 goto out_put;
2604 }
2605
2606 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2607 if (error) {
2608 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2609 goto out_free_index;
2610 }
2611
2612 sdkp->device = sdp;
2613 sdkp->driver = &sd_template;
2614 sdkp->disk = gd;
2615 sdkp->index = index;
2616 atomic_set(&sdkp->openers, 0);
2617
2618 if (!sdp->request_queue->rq_timeout) {
2619 if (sdp->type != TYPE_MOD)
2620 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2621 else
2622 blk_queue_rq_timeout(sdp->request_queue,
2623 SD_MOD_TIMEOUT);
2624 }
2625
2626 device_initialize(&sdkp->dev);
2627 sdkp->dev.parent = dev;
2628 sdkp->dev.class = &sd_disk_class;
2629 dev_set_name(&sdkp->dev, dev_name(dev));
2630
2631 if (device_add(&sdkp->dev))
2632 goto out_free_index;
2633
2634 get_device(dev);
2635 dev_set_drvdata(dev, sdkp);
2636
2637 get_device(&sdkp->dev); /* prevent release before async_schedule */
2638 async_schedule(sd_probe_async, sdkp);
2639
2640 return 0;
2641
2642 out_free_index:
2643 spin_lock(&sd_index_lock);
2644 ida_remove(&sd_index_ida, index);
2645 spin_unlock(&sd_index_lock);
2646 out_put:
2647 put_disk(gd);
2648 out_free:
2649 kfree(sdkp);
2650 out:
2651 return error;
2652 }
2653
2654 /**
2655 * sd_remove - called whenever a scsi disk (previously recognized by
2656 * sd_probe) is detached from the system. It is called (potentially
2657 * multiple times) during sd module unload.
2658 * @sdp: pointer to mid level scsi device object
2659 *
2660 * Note: this function is invoked from the scsi mid-level.
2661 * This function potentially frees up a device name (e.g. /dev/sdc)
2662 * that could be re-used by a subsequent sd_probe().
2663 * This function is not called when the built-in sd driver is "exit-ed".
2664 **/
2665 static int sd_remove(struct device *dev)
2666 {
2667 struct scsi_disk *sdkp;
2668
2669 sdkp = dev_get_drvdata(dev);
2670 scsi_autopm_get_device(sdkp->device);
2671
2672 async_synchronize_full();
2673 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2674 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2675 device_del(&sdkp->dev);
2676 del_gendisk(sdkp->disk);
2677 sd_shutdown(dev);
2678
2679 mutex_lock(&sd_ref_mutex);
2680 dev_set_drvdata(dev, NULL);
2681 put_device(&sdkp->dev);
2682 mutex_unlock(&sd_ref_mutex);
2683
2684 return 0;
2685 }
2686
2687 /**
2688 * scsi_disk_release - Called to free the scsi_disk structure
2689 * @dev: pointer to embedded class device
2690 *
2691 * sd_ref_mutex must be held entering this routine. Because it is
2692 * called on last put, you should always use the scsi_disk_get()
2693 * scsi_disk_put() helpers which manipulate the semaphore directly
2694 * and never do a direct put_device.
2695 **/
2696 static void scsi_disk_release(struct device *dev)
2697 {
2698 struct scsi_disk *sdkp = to_scsi_disk(dev);
2699 struct gendisk *disk = sdkp->disk;
2700
2701 spin_lock(&sd_index_lock);
2702 ida_remove(&sd_index_ida, sdkp->index);
2703 spin_unlock(&sd_index_lock);
2704
2705 disk->private_data = NULL;
2706 put_disk(disk);
2707 put_device(&sdkp->device->sdev_gendev);
2708
2709 kfree(sdkp);
2710 }
2711
2712 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2713 {
2714 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2715 struct scsi_sense_hdr sshdr;
2716 struct scsi_device *sdp = sdkp->device;
2717 int res;
2718
2719 if (start)
2720 cmd[4] |= 1; /* START */
2721
2722 if (sdp->start_stop_pwr_cond)
2723 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2724
2725 if (!scsi_device_online(sdp))
2726 return -ENODEV;
2727
2728 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2729 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2730 if (res) {
2731 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2732 sd_print_result(sdkp, res);
2733 if (driver_byte(res) & DRIVER_SENSE)
2734 sd_print_sense_hdr(sdkp, &sshdr);
2735 }
2736
2737 return res;
2738 }
2739
2740 /*
2741 * Send a SYNCHRONIZE CACHE instruction down to the device through
2742 * the normal SCSI command structure. Wait for the command to
2743 * complete.
2744 */
2745 static void sd_shutdown(struct device *dev)
2746 {
2747 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2748
2749 if (!sdkp)
2750 return; /* this can happen */
2751
2752 if (pm_runtime_suspended(dev))
2753 goto exit;
2754
2755 if (sdkp->WCE) {
2756 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2757 sd_sync_cache(sdkp);
2758 }
2759
2760 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2761 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2762 sd_start_stop_device(sdkp, 0);
2763 }
2764
2765 exit:
2766 scsi_disk_put(sdkp);
2767 }
2768
2769 static int sd_suspend(struct device *dev, pm_message_t mesg)
2770 {
2771 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2772 int ret = 0;
2773
2774 if (!sdkp)
2775 return 0; /* this can happen */
2776
2777 if (sdkp->WCE) {
2778 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2779 ret = sd_sync_cache(sdkp);
2780 if (ret)
2781 goto done;
2782 }
2783
2784 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2785 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2786 ret = sd_start_stop_device(sdkp, 0);
2787 }
2788
2789 done:
2790 scsi_disk_put(sdkp);
2791 return ret;
2792 }
2793
2794 static int sd_resume(struct device *dev)
2795 {
2796 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2797 int ret = 0;
2798
2799 if (!sdkp->device->manage_start_stop)
2800 goto done;
2801
2802 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2803 ret = sd_start_stop_device(sdkp, 1);
2804
2805 done:
2806 scsi_disk_put(sdkp);
2807 return ret;
2808 }
2809
2810 /**
2811 * init_sd - entry point for this driver (both when built in or when
2812 * a module).
2813 *
2814 * Note: this function registers this driver with the scsi mid-level.
2815 **/
2816 static int __init init_sd(void)
2817 {
2818 int majors = 0, i, err;
2819
2820 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2821
2822 for (i = 0; i < SD_MAJORS; i++)
2823 if (register_blkdev(sd_major(i), "sd") == 0)
2824 majors++;
2825
2826 if (!majors)
2827 return -ENODEV;
2828
2829 err = class_register(&sd_disk_class);
2830 if (err)
2831 goto err_out;
2832
2833 err = scsi_register_driver(&sd_template.gendrv);
2834 if (err)
2835 goto err_out_class;
2836
2837 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2838 0, 0, NULL);
2839 if (!sd_cdb_cache) {
2840 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2841 goto err_out_class;
2842 }
2843
2844 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2845 if (!sd_cdb_pool) {
2846 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2847 goto err_out_cache;
2848 }
2849
2850 return 0;
2851
2852 err_out_cache:
2853 kmem_cache_destroy(sd_cdb_cache);
2854
2855 err_out_class:
2856 class_unregister(&sd_disk_class);
2857 err_out:
2858 for (i = 0; i < SD_MAJORS; i++)
2859 unregister_blkdev(sd_major(i), "sd");
2860 return err;
2861 }
2862
2863 /**
2864 * exit_sd - exit point for this driver (when it is a module).
2865 *
2866 * Note: this function unregisters this driver from the scsi mid-level.
2867 **/
2868 static void __exit exit_sd(void)
2869 {
2870 int i;
2871
2872 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2873
2874 mempool_destroy(sd_cdb_pool);
2875 kmem_cache_destroy(sd_cdb_cache);
2876
2877 scsi_unregister_driver(&sd_template.gendrv);
2878 class_unregister(&sd_disk_class);
2879
2880 for (i = 0; i < SD_MAJORS; i++)
2881 unregister_blkdev(sd_major(i), "sd");
2882 }
2883
2884 module_init(init_sd);
2885 module_exit(exit_sd);
2886
2887 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2888 struct scsi_sense_hdr *sshdr)
2889 {
2890 sd_printk(KERN_INFO, sdkp, " ");
2891 scsi_show_sense_hdr(sshdr);
2892 sd_printk(KERN_INFO, sdkp, " ");
2893 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2894 }
2895
2896 static void sd_print_result(struct scsi_disk *sdkp, int result)
2897 {
2898 sd_printk(KERN_INFO, sdkp, " ");
2899 scsi_show_result(result);
2900 }
2901