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scsi: add sd_unprep_fn to free discard page
[linux-2.6/cjktty.git] / drivers / scsi / sd.c
blob2d4e3a865f39d07f7f03cdbf24cbb678dd5513f6
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 <asm/uaccess.h>
54 #include <asm/unaligned.h>
55
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
65
66 #include "sd.h"
67 #include "scsi_logging.h"
68
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
72
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
92
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
94 #define SD_MINORS 16
95 #else
96 #define SD_MINORS 0
97 #endif
98
99 static int sd_revalidate_disk(struct gendisk *);
100 static void sd_unlock_native_capacity(struct gendisk *disk);
101 static int sd_probe(struct device *);
102 static int sd_remove(struct device *);
103 static void sd_shutdown(struct device *);
104 static int sd_suspend(struct device *, pm_message_t state);
105 static int sd_resume(struct device *);
106 static void sd_rescan(struct device *);
107 static int sd_done(struct scsi_cmnd *);
108 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
109 static void scsi_disk_release(struct device *cdev);
110 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
111 static void sd_print_result(struct scsi_disk *, int);
112
113 static DEFINE_SPINLOCK(sd_index_lock);
114 static DEFINE_IDA(sd_index_ida);
115
116 /* This semaphore is used to mediate the 0->1 reference get in the
117 * face of object destruction (i.e. we can't allow a get on an
118 * object after last put) */
119 static DEFINE_MUTEX(sd_ref_mutex);
120
121 struct kmem_cache *sd_cdb_cache;
122 mempool_t *sd_cdb_pool;
123
124 static const char *sd_cache_types[] = {
125 "write through", "none", "write back",
126 "write back, no read (daft)"
127 };
128
129 static ssize_t
130 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
131 const char *buf, size_t count)
132 {
133 int i, ct = -1, rcd, wce, sp;
134 struct scsi_disk *sdkp = to_scsi_disk(dev);
135 struct scsi_device *sdp = sdkp->device;
136 char buffer[64];
137 char *buffer_data;
138 struct scsi_mode_data data;
139 struct scsi_sense_hdr sshdr;
140 int len;
141
142 if (sdp->type != TYPE_DISK)
143 /* no cache control on RBC devices; theoretically they
144 * can do it, but there's probably so many exceptions
145 * it's not worth the risk */
146 return -EINVAL;
147
148 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
149 const int len = strlen(sd_cache_types[i]);
150 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
151 buf[len] == '\n') {
152 ct = i;
153 break;
154 }
155 }
156 if (ct < 0)
157 return -EINVAL;
158 rcd = ct & 0x01 ? 1 : 0;
159 wce = ct & 0x02 ? 1 : 0;
160 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
161 SD_MAX_RETRIES, &data, NULL))
162 return -EINVAL;
163 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
164 data.block_descriptor_length);
165 buffer_data = buffer + data.header_length +
166 data.block_descriptor_length;
167 buffer_data[2] &= ~0x05;
168 buffer_data[2] |= wce << 2 | rcd;
169 sp = buffer_data[0] & 0x80 ? 1 : 0;
170
171 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
172 SD_MAX_RETRIES, &data, &sshdr)) {
173 if (scsi_sense_valid(&sshdr))
174 sd_print_sense_hdr(sdkp, &sshdr);
175 return -EINVAL;
176 }
177 revalidate_disk(sdkp->disk);
178 return count;
179 }
180
181 static ssize_t
182 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
184 {
185 struct scsi_disk *sdkp = to_scsi_disk(dev);
186 struct scsi_device *sdp = sdkp->device;
187
188 if (!capable(CAP_SYS_ADMIN))
189 return -EACCES;
190
191 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
192
193 return count;
194 }
195
196 static ssize_t
197 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
199 {
200 struct scsi_disk *sdkp = to_scsi_disk(dev);
201 struct scsi_device *sdp = sdkp->device;
202
203 if (!capable(CAP_SYS_ADMIN))
204 return -EACCES;
205
206 if (sdp->type != TYPE_DISK)
207 return -EINVAL;
208
209 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
210
211 return count;
212 }
213
214 static ssize_t
215 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
216 char *buf)
217 {
218 struct scsi_disk *sdkp = to_scsi_disk(dev);
219 int ct = sdkp->RCD + 2*sdkp->WCE;
220
221 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
222 }
223
224 static ssize_t
225 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
226 {
227 struct scsi_disk *sdkp = to_scsi_disk(dev);
228
229 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
230 }
231
232 static ssize_t
233 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
234 char *buf)
235 {
236 struct scsi_disk *sdkp = to_scsi_disk(dev);
237 struct scsi_device *sdp = sdkp->device;
238
239 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
240 }
241
242 static ssize_t
243 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
244 char *buf)
245 {
246 struct scsi_disk *sdkp = to_scsi_disk(dev);
247
248 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
249 }
250
251 static ssize_t
252 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
253 char *buf)
254 {
255 struct scsi_disk *sdkp = to_scsi_disk(dev);
256
257 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
258 }
259
260 static ssize_t
261 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
262 char *buf)
263 {
264 struct scsi_disk *sdkp = to_scsi_disk(dev);
265
266 return snprintf(buf, 20, "%u\n", sdkp->ATO);
267 }
268
269 static ssize_t
270 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
271 char *buf)
272 {
273 struct scsi_disk *sdkp = to_scsi_disk(dev);
274
275 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
276 }
277
278 static struct device_attribute sd_disk_attrs[] = {
279 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
280 sd_store_cache_type),
281 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
282 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
283 sd_store_allow_restart),
284 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
285 sd_store_manage_start_stop),
286 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
287 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
288 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
289 __ATTR_NULL,
290 };
291
292 static struct class sd_disk_class = {
293 .name = "scsi_disk",
294 .owner = THIS_MODULE,
295 .dev_release = scsi_disk_release,
296 .dev_attrs = sd_disk_attrs,
297 };
298
299 static struct scsi_driver sd_template = {
300 .owner = THIS_MODULE,
301 .gendrv = {
302 .name = "sd",
303 .probe = sd_probe,
304 .remove = sd_remove,
305 .suspend = sd_suspend,
306 .resume = sd_resume,
307 .shutdown = sd_shutdown,
308 },
309 .rescan = sd_rescan,
310 .done = sd_done,
311 };
312
313 /*
314 * Device no to disk mapping:
315 *
316 * major disc2 disc p1
317 * |............|.............|....|....| <- dev_t
318 * 31 20 19 8 7 4 3 0
319 *
320 * Inside a major, we have 16k disks, however mapped non-
321 * contiguously. The first 16 disks are for major0, the next
322 * ones with major1, ... Disk 256 is for major0 again, disk 272
323 * for major1, ...
324 * As we stay compatible with our numbering scheme, we can reuse
325 * the well-know SCSI majors 8, 65--71, 136--143.
326 */
327 static int sd_major(int major_idx)
328 {
329 switch (major_idx) {
330 case 0:
331 return SCSI_DISK0_MAJOR;
332 case 1 ... 7:
333 return SCSI_DISK1_MAJOR + major_idx - 1;
334 case 8 ... 15:
335 return SCSI_DISK8_MAJOR + major_idx - 8;
336 default:
337 BUG();
338 return 0; /* shut up gcc */
339 }
340 }
341
342 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
343 {
344 struct scsi_disk *sdkp = NULL;
345
346 if (disk->private_data) {
347 sdkp = scsi_disk(disk);
348 if (scsi_device_get(sdkp->device) == 0)
349 get_device(&sdkp->dev);
350 else
351 sdkp = NULL;
352 }
353 return sdkp;
354 }
355
356 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
357 {
358 struct scsi_disk *sdkp;
359
360 mutex_lock(&sd_ref_mutex);
361 sdkp = __scsi_disk_get(disk);
362 mutex_unlock(&sd_ref_mutex);
363 return sdkp;
364 }
365
366 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
367 {
368 struct scsi_disk *sdkp;
369
370 mutex_lock(&sd_ref_mutex);
371 sdkp = dev_get_drvdata(dev);
372 if (sdkp)
373 sdkp = __scsi_disk_get(sdkp->disk);
374 mutex_unlock(&sd_ref_mutex);
375 return sdkp;
376 }
377
378 static void scsi_disk_put(struct scsi_disk *sdkp)
379 {
380 struct scsi_device *sdev = sdkp->device;
381
382 mutex_lock(&sd_ref_mutex);
383 put_device(&sdkp->dev);
384 scsi_device_put(sdev);
385 mutex_unlock(&sd_ref_mutex);
386 }
387
388 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
389 {
390 unsigned int prot_op = SCSI_PROT_NORMAL;
391 unsigned int dix = scsi_prot_sg_count(scmd);
392
393 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
394 if (dif && dix)
395 prot_op = SCSI_PROT_READ_PASS;
396 else if (dif && !dix)
397 prot_op = SCSI_PROT_READ_STRIP;
398 else if (!dif && dix)
399 prot_op = SCSI_PROT_READ_INSERT;
400 } else {
401 if (dif && dix)
402 prot_op = SCSI_PROT_WRITE_PASS;
403 else if (dif && !dix)
404 prot_op = SCSI_PROT_WRITE_INSERT;
405 else if (!dif && dix)
406 prot_op = SCSI_PROT_WRITE_STRIP;
407 }
408
409 scsi_set_prot_op(scmd, prot_op);
410 scsi_set_prot_type(scmd, dif);
411 }
412
413 /**
414 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
415 * @sdp: scsi device to operate one
416 * @rq: Request to prepare
417 *
418 * Will issue either UNMAP or WRITE SAME(16) depending on preference
419 * indicated by target device.
420 **/
421 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
422 {
423 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
424 struct bio *bio = rq->bio;
425 sector_t sector = bio->bi_sector;
426 unsigned int nr_sectors = bio_sectors(bio);
427 unsigned int len;
428 int ret;
429 struct page *page;
430
431 if (sdkp->device->sector_size == 4096) {
432 sector >>= 3;
433 nr_sectors >>= 3;
434 }
435
436 rq->cmd_type = REQ_TYPE_BLOCK_PC;
437 rq->timeout = SD_TIMEOUT;
438
439 memset(rq->cmd, 0, rq->cmd_len);
440
441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
442 if (!page)
443 return BLKPREP_DEFER;
444
445 if (sdkp->unmap) {
446 char *buf = page_address(page);
447
448 rq->cmd_len = 10;
449 rq->cmd[0] = UNMAP;
450 rq->cmd[8] = 24;
451
452 put_unaligned_be16(6 + 16, &buf[0]);
453 put_unaligned_be16(16, &buf[2]);
454 put_unaligned_be64(sector, &buf[8]);
455 put_unaligned_be32(nr_sectors, &buf[16]);
456
457 len = 24;
458 } else {
459 rq->cmd_len = 16;
460 rq->cmd[0] = WRITE_SAME_16;
461 rq->cmd[1] = 0x8; /* UNMAP */
462 put_unaligned_be64(sector, &rq->cmd[2]);
463 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
464
465 len = sdkp->device->sector_size;
466 }
467
468 blk_add_request_payload(rq, page, len);
469 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
470 rq->buffer = page_address(page);
471 return ret;
472 }
473
474 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
475 {
476 if (rq->cmd_flags & REQ_DISCARD)
477 __free_page(virt_to_page(rq->buffer));
478 }
479
480 /**
481 * sd_init_command - build a scsi (read or write) command from
482 * information in the request structure.
483 * @SCpnt: pointer to mid-level's per scsi command structure that
484 * contains request and into which the scsi command is written
485 *
486 * Returns 1 if successful and 0 if error (or cannot be done now).
487 **/
488 static int sd_prep_fn(struct request_queue *q, struct request *rq)
489 {
490 struct scsi_cmnd *SCpnt;
491 struct scsi_device *sdp = q->queuedata;
492 struct gendisk *disk = rq->rq_disk;
493 struct scsi_disk *sdkp;
494 sector_t block = blk_rq_pos(rq);
495 sector_t threshold;
496 unsigned int this_count = blk_rq_sectors(rq);
497 int ret, host_dif;
498 unsigned char protect;
499
500 /*
501 * Discard request come in as REQ_TYPE_FS but we turn them into
502 * block PC requests to make life easier.
503 */
504 if (rq->cmd_flags & REQ_DISCARD) {
505 ret = scsi_setup_discard_cmnd(sdp, rq);
506 goto out;
507 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
508 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
509 goto out;
510 } else if (rq->cmd_type != REQ_TYPE_FS) {
511 ret = BLKPREP_KILL;
512 goto out;
513 }
514 ret = scsi_setup_fs_cmnd(sdp, rq);
515 if (ret != BLKPREP_OK)
516 goto out;
517 SCpnt = rq->special;
518 sdkp = scsi_disk(disk);
519
520 /* from here on until we're complete, any goto out
521 * is used for a killable error condition */
522 ret = BLKPREP_KILL;
523
524 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
525 "sd_init_command: block=%llu, "
526 "count=%d\n",
527 (unsigned long long)block,
528 this_count));
529
530 if (!sdp || !scsi_device_online(sdp) ||
531 block + blk_rq_sectors(rq) > get_capacity(disk)) {
532 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
533 "Finishing %u sectors\n",
534 blk_rq_sectors(rq)));
535 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
536 "Retry with 0x%p\n", SCpnt));
537 goto out;
538 }
539
540 if (sdp->changed) {
541 /*
542 * quietly refuse to do anything to a changed disc until
543 * the changed bit has been reset
544 */
545 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
546 goto out;
547 }
548
549 /*
550 * Some SD card readers can't handle multi-sector accesses which touch
551 * the last one or two hardware sectors. Split accesses as needed.
552 */
553 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
554 (sdp->sector_size / 512);
555
556 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
557 if (block < threshold) {
558 /* Access up to the threshold but not beyond */
559 this_count = threshold - block;
560 } else {
561 /* Access only a single hardware sector */
562 this_count = sdp->sector_size / 512;
563 }
564 }
565
566 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
567 (unsigned long long)block));
568
569 /*
570 * If we have a 1K hardware sectorsize, prevent access to single
571 * 512 byte sectors. In theory we could handle this - in fact
572 * the scsi cdrom driver must be able to handle this because
573 * we typically use 1K blocksizes, and cdroms typically have
574 * 2K hardware sectorsizes. Of course, things are simpler
575 * with the cdrom, since it is read-only. For performance
576 * reasons, the filesystems should be able to handle this
577 * and not force the scsi disk driver to use bounce buffers
578 * for this.
579 */
580 if (sdp->sector_size == 1024) {
581 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
582 scmd_printk(KERN_ERR, SCpnt,
583 "Bad block number requested\n");
584 goto out;
585 } else {
586 block = block >> 1;
587 this_count = this_count >> 1;
588 }
589 }
590 if (sdp->sector_size == 2048) {
591 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
592 scmd_printk(KERN_ERR, SCpnt,
593 "Bad block number requested\n");
594 goto out;
595 } else {
596 block = block >> 2;
597 this_count = this_count >> 2;
598 }
599 }
600 if (sdp->sector_size == 4096) {
601 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
602 scmd_printk(KERN_ERR, SCpnt,
603 "Bad block number requested\n");
604 goto out;
605 } else {
606 block = block >> 3;
607 this_count = this_count >> 3;
608 }
609 }
610 if (rq_data_dir(rq) == WRITE) {
611 if (!sdp->writeable) {
612 goto out;
613 }
614 SCpnt->cmnd[0] = WRITE_6;
615 SCpnt->sc_data_direction = DMA_TO_DEVICE;
616
617 if (blk_integrity_rq(rq) &&
618 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
619 goto out;
620
621 } else if (rq_data_dir(rq) == READ) {
622 SCpnt->cmnd[0] = READ_6;
623 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
624 } else {
625 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
626 goto out;
627 }
628
629 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
630 "%s %d/%u 512 byte blocks.\n",
631 (rq_data_dir(rq) == WRITE) ?
632 "writing" : "reading", this_count,
633 blk_rq_sectors(rq)));
634
635 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
636 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
637 if (host_dif)
638 protect = 1 << 5;
639 else
640 protect = 0;
641
642 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
643 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
644
645 if (unlikely(SCpnt->cmnd == NULL)) {
646 ret = BLKPREP_DEFER;
647 goto out;
648 }
649
650 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
651 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
652 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
653 SCpnt->cmnd[7] = 0x18;
654 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
655 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
656
657 /* LBA */
658 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
659 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
660 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
661 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
662 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
663 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
664 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
665 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
666
667 /* Expected Indirect LBA */
668 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
669 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
670 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
671 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
672
673 /* Transfer length */
674 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
675 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
676 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
677 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
678 } else if (block > 0xffffffff) {
679 SCpnt->cmnd[0] += READ_16 - READ_6;
680 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
681 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
682 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
683 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
684 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
685 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
686 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
687 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
688 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
689 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
690 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
691 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
692 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
693 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
694 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
695 scsi_device_protection(SCpnt->device) ||
696 SCpnt->device->use_10_for_rw) {
697 if (this_count > 0xffff)
698 this_count = 0xffff;
699
700 SCpnt->cmnd[0] += READ_10 - READ_6;
701 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
702 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
703 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
704 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
705 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
706 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
707 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
708 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
709 } else {
710 if (unlikely(rq->cmd_flags & REQ_FUA)) {
711 /*
712 * This happens only if this drive failed
713 * 10byte rw command with ILLEGAL_REQUEST
714 * during operation and thus turned off
715 * use_10_for_rw.
716 */
717 scmd_printk(KERN_ERR, SCpnt,
718 "FUA write on READ/WRITE(6) drive\n");
719 goto out;
720 }
721
722 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
723 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
724 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
725 SCpnt->cmnd[4] = (unsigned char) this_count;
726 SCpnt->cmnd[5] = 0;
727 }
728 SCpnt->sdb.length = this_count * sdp->sector_size;
729
730 /* If DIF or DIX is enabled, tell HBA how to handle request */
731 if (host_dif || scsi_prot_sg_count(SCpnt))
732 sd_prot_op(SCpnt, host_dif);
733
734 /*
735 * We shouldn't disconnect in the middle of a sector, so with a dumb
736 * host adapter, it's safe to assume that we can at least transfer
737 * this many bytes between each connect / disconnect.
738 */
739 SCpnt->transfersize = sdp->sector_size;
740 SCpnt->underflow = this_count << 9;
741 SCpnt->allowed = SD_MAX_RETRIES;
742
743 /*
744 * This indicates that the command is ready from our end to be
745 * queued.
746 */
747 ret = BLKPREP_OK;
748 out:
749 return scsi_prep_return(q, rq, ret);
750 }
751
752 /**
753 * sd_open - open a scsi disk device
754 * @inode: only i_rdev member may be used
755 * @filp: only f_mode and f_flags may be used
756 *
757 * Returns 0 if successful. Returns a negated errno value in case
758 * of error.
759 *
760 * Note: This can be called from a user context (e.g. fsck(1) )
761 * or from within the kernel (e.g. as a result of a mount(1) ).
762 * In the latter case @inode and @filp carry an abridged amount
763 * of information as noted above.
764 **/
765 static int sd_open(struct block_device *bdev, fmode_t mode)
766 {
767 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
768 struct scsi_device *sdev;
769 int retval;
770
771 if (!sdkp)
772 return -ENXIO;
773
774 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
775
776 sdev = sdkp->device;
777
778 /*
779 * If the device is in error recovery, wait until it is done.
780 * If the device is offline, then disallow any access to it.
781 */
782 retval = -ENXIO;
783 if (!scsi_block_when_processing_errors(sdev))
784 goto error_out;
785
786 if (sdev->removable || sdkp->write_prot)
787 check_disk_change(bdev);
788
789 /*
790 * If the drive is empty, just let the open fail.
791 */
792 retval = -ENOMEDIUM;
793 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
794 goto error_out;
795
796 /*
797 * If the device has the write protect tab set, have the open fail
798 * if the user expects to be able to write to the thing.
799 */
800 retval = -EROFS;
801 if (sdkp->write_prot && (mode & FMODE_WRITE))
802 goto error_out;
803
804 /*
805 * It is possible that the disk changing stuff resulted in
806 * the device being taken offline. If this is the case,
807 * report this to the user, and don't pretend that the
808 * open actually succeeded.
809 */
810 retval = -ENXIO;
811 if (!scsi_device_online(sdev))
812 goto error_out;
813
814 if (!sdkp->openers++ && sdev->removable) {
815 if (scsi_block_when_processing_errors(sdev))
816 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
817 }
818
819 return 0;
820
821 error_out:
822 scsi_disk_put(sdkp);
823 return retval;
824 }
825
826 /**
827 * sd_release - invoked when the (last) close(2) is called on this
828 * scsi disk.
829 * @inode: only i_rdev member may be used
830 * @filp: only f_mode and f_flags may be used
831 *
832 * Returns 0.
833 *
834 * Note: may block (uninterruptible) if error recovery is underway
835 * on this disk.
836 **/
837 static int sd_release(struct gendisk *disk, fmode_t mode)
838 {
839 struct scsi_disk *sdkp = scsi_disk(disk);
840 struct scsi_device *sdev = sdkp->device;
841
842 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
843
844 if (!--sdkp->openers && sdev->removable) {
845 if (scsi_block_when_processing_errors(sdev))
846 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
847 }
848
849 /*
850 * XXX and what if there are packets in flight and this close()
851 * XXX is followed by a "rmmod sd_mod"?
852 */
853 scsi_disk_put(sdkp);
854 return 0;
855 }
856
857 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
858 {
859 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
860 struct scsi_device *sdp = sdkp->device;
861 struct Scsi_Host *host = sdp->host;
862 int diskinfo[4];
863
864 /* default to most commonly used values */
865 diskinfo[0] = 0x40; /* 1 << 6 */
866 diskinfo[1] = 0x20; /* 1 << 5 */
867 diskinfo[2] = sdkp->capacity >> 11;
868
869 /* override with calculated, extended default, or driver values */
870 if (host->hostt->bios_param)
871 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
872 else
873 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
874
875 geo->heads = diskinfo[0];
876 geo->sectors = diskinfo[1];
877 geo->cylinders = diskinfo[2];
878 return 0;
879 }
880
881 /**
882 * sd_ioctl - process an ioctl
883 * @inode: only i_rdev/i_bdev members may be used
884 * @filp: only f_mode and f_flags may be used
885 * @cmd: ioctl command number
886 * @arg: this is third argument given to ioctl(2) system call.
887 * Often contains a pointer.
888 *
889 * Returns 0 if successful (some ioctls return postive numbers on
890 * success as well). Returns a negated errno value in case of error.
891 *
892 * Note: most ioctls are forward onto the block subsystem or further
893 * down in the scsi subsystem.
894 **/
895 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
896 unsigned int cmd, unsigned long arg)
897 {
898 struct gendisk *disk = bdev->bd_disk;
899 struct scsi_device *sdp = scsi_disk(disk)->device;
900 void __user *p = (void __user *)arg;
901 int error;
902
903 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
904 disk->disk_name, cmd));
905
906 /*
907 * If we are in the middle of error recovery, don't let anyone
908 * else try and use this device. Also, if error recovery fails, it
909 * may try and take the device offline, in which case all further
910 * access to the device is prohibited.
911 */
912 error = scsi_nonblockable_ioctl(sdp, cmd, p,
913 (mode & FMODE_NDELAY) != 0);
914 if (!scsi_block_when_processing_errors(sdp) || !error)
915 return error;
916
917 /*
918 * Send SCSI addressing ioctls directly to mid level, send other
919 * ioctls to block level and then onto mid level if they can't be
920 * resolved.
921 */
922 switch (cmd) {
923 case SCSI_IOCTL_GET_IDLUN:
924 case SCSI_IOCTL_GET_BUS_NUMBER:
925 return scsi_ioctl(sdp, cmd, p);
926 default:
927 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
928 if (error != -ENOTTY)
929 return error;
930 }
931 return scsi_ioctl(sdp, cmd, p);
932 }
933
934 static void set_media_not_present(struct scsi_disk *sdkp)
935 {
936 sdkp->media_present = 0;
937 sdkp->capacity = 0;
938 sdkp->device->changed = 1;
939 }
940
941 /**
942 * sd_media_changed - check if our medium changed
943 * @disk: kernel device descriptor
944 *
945 * Returns 0 if not applicable or no change; 1 if change
946 *
947 * Note: this function is invoked from the block subsystem.
948 **/
949 static int sd_media_changed(struct gendisk *disk)
950 {
951 struct scsi_disk *sdkp = scsi_disk(disk);
952 struct scsi_device *sdp = sdkp->device;
953 struct scsi_sense_hdr *sshdr = NULL;
954 int retval;
955
956 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
957
958 if (!sdp->removable)
959 return 0;
960
961 /*
962 * If the device is offline, don't send any commands - just pretend as
963 * if the command failed. If the device ever comes back online, we
964 * can deal with it then. It is only because of unrecoverable errors
965 * that we would ever take a device offline in the first place.
966 */
967 if (!scsi_device_online(sdp)) {
968 set_media_not_present(sdkp);
969 retval = 1;
970 goto out;
971 }
972
973 /*
974 * Using TEST_UNIT_READY enables differentiation between drive with
975 * no cartridge loaded - NOT READY, drive with changed cartridge -
976 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
977 *
978 * Drives that auto spin down. eg iomega jaz 1G, will be started
979 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
980 * sd_revalidate() is called.
981 */
982 retval = -ENODEV;
983
984 if (scsi_block_when_processing_errors(sdp)) {
985 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
986 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
987 sshdr);
988 }
989
990 /*
991 * Unable to test, unit probably not ready. This usually
992 * means there is no disc in the drive. Mark as changed,
993 * and we will figure it out later once the drive is
994 * available again.
995 */
996 if (retval || (scsi_sense_valid(sshdr) &&
997 /* 0x3a is medium not present */
998 sshdr->asc == 0x3a)) {
999 set_media_not_present(sdkp);
1000 retval = 1;
1001 goto out;
1002 }
1003
1004 /*
1005 * For removable scsi disk we have to recognise the presence
1006 * of a disk in the drive. This is kept in the struct scsi_disk
1007 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1008 */
1009 sdkp->media_present = 1;
1010
1011 retval = sdp->changed;
1012 sdp->changed = 0;
1013 out:
1014 if (retval != sdkp->previous_state)
1015 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1016 sdkp->previous_state = retval;
1017 kfree(sshdr);
1018 return retval;
1019 }
1020
1021 static int sd_sync_cache(struct scsi_disk *sdkp)
1022 {
1023 int retries, res;
1024 struct scsi_device *sdp = sdkp->device;
1025 struct scsi_sense_hdr sshdr;
1026
1027 if (!scsi_device_online(sdp))
1028 return -ENODEV;
1029
1030
1031 for (retries = 3; retries > 0; --retries) {
1032 unsigned char cmd[10] = { 0 };
1033
1034 cmd[0] = SYNCHRONIZE_CACHE;
1035 /*
1036 * Leave the rest of the command zero to indicate
1037 * flush everything.
1038 */
1039 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1040 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1041 if (res == 0)
1042 break;
1043 }
1044
1045 if (res) {
1046 sd_print_result(sdkp, res);
1047 if (driver_byte(res) & DRIVER_SENSE)
1048 sd_print_sense_hdr(sdkp, &sshdr);
1049 }
1050
1051 if (res)
1052 return -EIO;
1053 return 0;
1054 }
1055
1056 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
1057 {
1058 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1059 rq->timeout = SD_TIMEOUT;
1060 rq->retries = SD_MAX_RETRIES;
1061 rq->cmd[0] = SYNCHRONIZE_CACHE;
1062 rq->cmd_len = 10;
1063 }
1064
1065 static void sd_rescan(struct device *dev)
1066 {
1067 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1068
1069 if (sdkp) {
1070 revalidate_disk(sdkp->disk);
1071 scsi_disk_put(sdkp);
1072 }
1073 }
1074
1075
1076 #ifdef CONFIG_COMPAT
1077 /*
1078 * This gets directly called from VFS. When the ioctl
1079 * is not recognized we go back to the other translation paths.
1080 */
1081 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1082 unsigned int cmd, unsigned long arg)
1083 {
1084 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1085
1086 /*
1087 * If we are in the middle of error recovery, don't let anyone
1088 * else try and use this device. Also, if error recovery fails, it
1089 * may try and take the device offline, in which case all further
1090 * access to the device is prohibited.
1091 */
1092 if (!scsi_block_when_processing_errors(sdev))
1093 return -ENODEV;
1094
1095 if (sdev->host->hostt->compat_ioctl) {
1096 int ret;
1097
1098 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1099
1100 return ret;
1101 }
1102
1103 /*
1104 * Let the static ioctl translation table take care of it.
1105 */
1106 return -ENOIOCTLCMD;
1107 }
1108 #endif
1109
1110 static const struct block_device_operations sd_fops = {
1111 .owner = THIS_MODULE,
1112 .open = sd_open,
1113 .release = sd_release,
1114 .locked_ioctl = sd_ioctl,
1115 .getgeo = sd_getgeo,
1116 #ifdef CONFIG_COMPAT
1117 .compat_ioctl = sd_compat_ioctl,
1118 #endif
1119 .media_changed = sd_media_changed,
1120 .revalidate_disk = sd_revalidate_disk,
1121 .unlock_native_capacity = sd_unlock_native_capacity,
1122 };
1123
1124 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1125 {
1126 u64 start_lba = blk_rq_pos(scmd->request);
1127 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1128 u64 bad_lba;
1129 int info_valid;
1130
1131 if (scmd->request->cmd_type != REQ_TYPE_FS)
1132 return 0;
1133
1134 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1135 SCSI_SENSE_BUFFERSIZE,
1136 &bad_lba);
1137 if (!info_valid)
1138 return 0;
1139
1140 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1141 return 0;
1142
1143 if (scmd->device->sector_size < 512) {
1144 /* only legitimate sector_size here is 256 */
1145 start_lba <<= 1;
1146 end_lba <<= 1;
1147 } else {
1148 /* be careful ... don't want any overflows */
1149 u64 factor = scmd->device->sector_size / 512;
1150 do_div(start_lba, factor);
1151 do_div(end_lba, factor);
1152 }
1153
1154 /* The bad lba was reported incorrectly, we have no idea where
1155 * the error is.
1156 */
1157 if (bad_lba < start_lba || bad_lba >= end_lba)
1158 return 0;
1159
1160 /* This computation should always be done in terms of
1161 * the resolution of the device's medium.
1162 */
1163 return (bad_lba - start_lba) * scmd->device->sector_size;
1164 }
1165
1166 /**
1167 * sd_done - bottom half handler: called when the lower level
1168 * driver has completed (successfully or otherwise) a scsi command.
1169 * @SCpnt: mid-level's per command structure.
1170 *
1171 * Note: potentially run from within an ISR. Must not block.
1172 **/
1173 static int sd_done(struct scsi_cmnd *SCpnt)
1174 {
1175 int result = SCpnt->result;
1176 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1177 struct scsi_sense_hdr sshdr;
1178 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1179 int sense_valid = 0;
1180 int sense_deferred = 0;
1181
1182 /*
1183 * If this is a discard request that originated from the kernel
1184 * we need to free our payload here. Note that we need to check
1185 * the request flag as the normal payload rules apply for
1186 * pass-through UNMAP / WRITE SAME requests.
1187 */
1188 if (SCpnt->request->cmd_flags & REQ_DISCARD)
1189 __free_page(bio_page(SCpnt->request->bio));
1190
1191 if (result) {
1192 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1193 if (sense_valid)
1194 sense_deferred = scsi_sense_is_deferred(&sshdr);
1195 }
1196 #ifdef CONFIG_SCSI_LOGGING
1197 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1198 if (sense_valid) {
1199 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1200 "sd_done: sb[respc,sk,asc,"
1201 "ascq]=%x,%x,%x,%x\n",
1202 sshdr.response_code,
1203 sshdr.sense_key, sshdr.asc,
1204 sshdr.ascq));
1205 }
1206 #endif
1207 if (driver_byte(result) != DRIVER_SENSE &&
1208 (!sense_valid || sense_deferred))
1209 goto out;
1210
1211 switch (sshdr.sense_key) {
1212 case HARDWARE_ERROR:
1213 case MEDIUM_ERROR:
1214 good_bytes = sd_completed_bytes(SCpnt);
1215 break;
1216 case RECOVERED_ERROR:
1217 good_bytes = scsi_bufflen(SCpnt);
1218 break;
1219 case NO_SENSE:
1220 /* This indicates a false check condition, so ignore it. An
1221 * unknown amount of data was transferred so treat it as an
1222 * error.
1223 */
1224 scsi_print_sense("sd", SCpnt);
1225 SCpnt->result = 0;
1226 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1227 break;
1228 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1229 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1230 if (sshdr.asc == 0x10)
1231 good_bytes = sd_completed_bytes(SCpnt);
1232 break;
1233 default:
1234 break;
1235 }
1236 out:
1237 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1238 sd_dif_complete(SCpnt, good_bytes);
1239
1240 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1241 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1242
1243 /* We have to print a failed command here as the
1244 * extended CDB gets freed before scsi_io_completion()
1245 * is called.
1246 */
1247 if (result)
1248 scsi_print_command(SCpnt);
1249
1250 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1251 SCpnt->cmnd = NULL;
1252 SCpnt->cmd_len = 0;
1253 }
1254
1255 return good_bytes;
1256 }
1257
1258 static int media_not_present(struct scsi_disk *sdkp,
1259 struct scsi_sense_hdr *sshdr)
1260 {
1261
1262 if (!scsi_sense_valid(sshdr))
1263 return 0;
1264 /* not invoked for commands that could return deferred errors */
1265 if (sshdr->sense_key != NOT_READY &&
1266 sshdr->sense_key != UNIT_ATTENTION)
1267 return 0;
1268 if (sshdr->asc != 0x3A) /* medium not present */
1269 return 0;
1270
1271 set_media_not_present(sdkp);
1272 return 1;
1273 }
1274
1275 /*
1276 * spinup disk - called only in sd_revalidate_disk()
1277 */
1278 static void
1279 sd_spinup_disk(struct scsi_disk *sdkp)
1280 {
1281 unsigned char cmd[10];
1282 unsigned long spintime_expire = 0;
1283 int retries, spintime;
1284 unsigned int the_result;
1285 struct scsi_sense_hdr sshdr;
1286 int sense_valid = 0;
1287
1288 spintime = 0;
1289
1290 /* Spin up drives, as required. Only do this at boot time */
1291 /* Spinup needs to be done for module loads too. */
1292 do {
1293 retries = 0;
1294
1295 do {
1296 cmd[0] = TEST_UNIT_READY;
1297 memset((void *) &cmd[1], 0, 9);
1298
1299 the_result = scsi_execute_req(sdkp->device, cmd,
1300 DMA_NONE, NULL, 0,
1301 &sshdr, SD_TIMEOUT,
1302 SD_MAX_RETRIES, NULL);
1303
1304 /*
1305 * If the drive has indicated to us that it
1306 * doesn't have any media in it, don't bother
1307 * with any more polling.
1308 */
1309 if (media_not_present(sdkp, &sshdr))
1310 return;
1311
1312 if (the_result)
1313 sense_valid = scsi_sense_valid(&sshdr);
1314 retries++;
1315 } while (retries < 3 &&
1316 (!scsi_status_is_good(the_result) ||
1317 ((driver_byte(the_result) & DRIVER_SENSE) &&
1318 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1319
1320 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1321 /* no sense, TUR either succeeded or failed
1322 * with a status error */
1323 if(!spintime && !scsi_status_is_good(the_result)) {
1324 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1325 sd_print_result(sdkp, the_result);
1326 }
1327 break;
1328 }
1329
1330 /*
1331 * The device does not want the automatic start to be issued.
1332 */
1333 if (sdkp->device->no_start_on_add)
1334 break;
1335
1336 if (sense_valid && sshdr.sense_key == NOT_READY) {
1337 if (sshdr.asc == 4 && sshdr.ascq == 3)
1338 break; /* manual intervention required */
1339 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1340 break; /* standby */
1341 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1342 break; /* unavailable */
1343 /*
1344 * Issue command to spin up drive when not ready
1345 */
1346 if (!spintime) {
1347 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1348 cmd[0] = START_STOP;
1349 cmd[1] = 1; /* Return immediately */
1350 memset((void *) &cmd[2], 0, 8);
1351 cmd[4] = 1; /* Start spin cycle */
1352 if (sdkp->device->start_stop_pwr_cond)
1353 cmd[4] |= 1 << 4;
1354 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1355 NULL, 0, &sshdr,
1356 SD_TIMEOUT, SD_MAX_RETRIES,
1357 NULL);
1358 spintime_expire = jiffies + 100 * HZ;
1359 spintime = 1;
1360 }
1361 /* Wait 1 second for next try */
1362 msleep(1000);
1363 printk(".");
1364
1365 /*
1366 * Wait for USB flash devices with slow firmware.
1367 * Yes, this sense key/ASC combination shouldn't
1368 * occur here. It's characteristic of these devices.
1369 */
1370 } else if (sense_valid &&
1371 sshdr.sense_key == UNIT_ATTENTION &&
1372 sshdr.asc == 0x28) {
1373 if (!spintime) {
1374 spintime_expire = jiffies + 5 * HZ;
1375 spintime = 1;
1376 }
1377 /* Wait 1 second for next try */
1378 msleep(1000);
1379 } else {
1380 /* we don't understand the sense code, so it's
1381 * probably pointless to loop */
1382 if(!spintime) {
1383 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1384 sd_print_sense_hdr(sdkp, &sshdr);
1385 }
1386 break;
1387 }
1388
1389 } while (spintime && time_before_eq(jiffies, spintime_expire));
1390
1391 if (spintime) {
1392 if (scsi_status_is_good(the_result))
1393 printk("ready\n");
1394 else
1395 printk("not responding...\n");
1396 }
1397 }
1398
1399
1400 /*
1401 * Determine whether disk supports Data Integrity Field.
1402 */
1403 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1404 {
1405 struct scsi_device *sdp = sdkp->device;
1406 u8 type;
1407
1408 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1409 return;
1410
1411 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1412
1413 if (type == sdkp->protection_type || !sdkp->first_scan)
1414 return;
1415
1416 sdkp->protection_type = type;
1417
1418 if (type > SD_DIF_TYPE3_PROTECTION) {
1419 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1420 "protection type %u. Disabling disk!\n", type);
1421 sdkp->capacity = 0;
1422 return;
1423 }
1424
1425 if (scsi_host_dif_capable(sdp->host, type))
1426 sd_printk(KERN_NOTICE, sdkp,
1427 "Enabling DIF Type %u protection\n", type);
1428 else
1429 sd_printk(KERN_NOTICE, sdkp,
1430 "Disabling DIF Type %u protection\n", type);
1431 }
1432
1433 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1434 struct scsi_sense_hdr *sshdr, int sense_valid,
1435 int the_result)
1436 {
1437 sd_print_result(sdkp, the_result);
1438 if (driver_byte(the_result) & DRIVER_SENSE)
1439 sd_print_sense_hdr(sdkp, sshdr);
1440 else
1441 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1442
1443 /*
1444 * Set dirty bit for removable devices if not ready -
1445 * sometimes drives will not report this properly.
1446 */
1447 if (sdp->removable &&
1448 sense_valid && sshdr->sense_key == NOT_READY)
1449 sdp->changed = 1;
1450
1451 /*
1452 * We used to set media_present to 0 here to indicate no media
1453 * in the drive, but some drives fail read capacity even with
1454 * media present, so we can't do that.
1455 */
1456 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1457 }
1458
1459 #define RC16_LEN 32
1460 #if RC16_LEN > SD_BUF_SIZE
1461 #error RC16_LEN must not be more than SD_BUF_SIZE
1462 #endif
1463
1464 #define READ_CAPACITY_RETRIES_ON_RESET 10
1465
1466 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1467 unsigned char *buffer)
1468 {
1469 unsigned char cmd[16];
1470 struct scsi_sense_hdr sshdr;
1471 int sense_valid = 0;
1472 int the_result;
1473 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1474 unsigned int alignment;
1475 unsigned long long lba;
1476 unsigned sector_size;
1477
1478 do {
1479 memset(cmd, 0, 16);
1480 cmd[0] = SERVICE_ACTION_IN;
1481 cmd[1] = SAI_READ_CAPACITY_16;
1482 cmd[13] = RC16_LEN;
1483 memset(buffer, 0, RC16_LEN);
1484
1485 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1486 buffer, RC16_LEN, &sshdr,
1487 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1488
1489 if (media_not_present(sdkp, &sshdr))
1490 return -ENODEV;
1491
1492 if (the_result) {
1493 sense_valid = scsi_sense_valid(&sshdr);
1494 if (sense_valid &&
1495 sshdr.sense_key == ILLEGAL_REQUEST &&
1496 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1497 sshdr.ascq == 0x00)
1498 /* Invalid Command Operation Code or
1499 * Invalid Field in CDB, just retry
1500 * silently with RC10 */
1501 return -EINVAL;
1502 if (sense_valid &&
1503 sshdr.sense_key == UNIT_ATTENTION &&
1504 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1505 /* Device reset might occur several times,
1506 * give it one more chance */
1507 if (--reset_retries > 0)
1508 continue;
1509 }
1510 retries--;
1511
1512 } while (the_result && retries);
1513
1514 if (the_result) {
1515 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1516 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1517 return -EINVAL;
1518 }
1519
1520 sector_size = get_unaligned_be32(&buffer[8]);
1521 lba = get_unaligned_be64(&buffer[0]);
1522
1523 sd_read_protection_type(sdkp, buffer);
1524
1525 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1526 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1527 "kernel compiled with support for large block "
1528 "devices.\n");
1529 sdkp->capacity = 0;
1530 return -EOVERFLOW;
1531 }
1532
1533 /* Logical blocks per physical block exponent */
1534 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1535
1536 /* Lowest aligned logical block */
1537 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1538 blk_queue_alignment_offset(sdp->request_queue, alignment);
1539 if (alignment && sdkp->first_scan)
1540 sd_printk(KERN_NOTICE, sdkp,
1541 "physical block alignment offset: %u\n", alignment);
1542
1543 if (buffer[14] & 0x80) { /* TPE */
1544 struct request_queue *q = sdp->request_queue;
1545
1546 sdkp->thin_provisioning = 1;
1547 q->limits.discard_granularity = sdkp->hw_sector_size;
1548 q->limits.max_discard_sectors = 0xffffffff;
1549
1550 if (buffer[14] & 0x40) /* TPRZ */
1551 q->limits.discard_zeroes_data = 1;
1552
1553 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1554 }
1555
1556 sdkp->capacity = lba + 1;
1557 return sector_size;
1558 }
1559
1560 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1561 unsigned char *buffer)
1562 {
1563 unsigned char cmd[16];
1564 struct scsi_sense_hdr sshdr;
1565 int sense_valid = 0;
1566 int the_result;
1567 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1568 sector_t lba;
1569 unsigned sector_size;
1570
1571 do {
1572 cmd[0] = READ_CAPACITY;
1573 memset(&cmd[1], 0, 9);
1574 memset(buffer, 0, 8);
1575
1576 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1577 buffer, 8, &sshdr,
1578 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1579
1580 if (media_not_present(sdkp, &sshdr))
1581 return -ENODEV;
1582
1583 if (the_result) {
1584 sense_valid = scsi_sense_valid(&sshdr);
1585 if (sense_valid &&
1586 sshdr.sense_key == UNIT_ATTENTION &&
1587 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1588 /* Device reset might occur several times,
1589 * give it one more chance */
1590 if (--reset_retries > 0)
1591 continue;
1592 }
1593 retries--;
1594
1595 } while (the_result && retries);
1596
1597 if (the_result) {
1598 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1599 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1600 return -EINVAL;
1601 }
1602
1603 sector_size = get_unaligned_be32(&buffer[4]);
1604 lba = get_unaligned_be32(&buffer[0]);
1605
1606 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1607 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1608 "kernel compiled with support for large block "
1609 "devices.\n");
1610 sdkp->capacity = 0;
1611 return -EOVERFLOW;
1612 }
1613
1614 sdkp->capacity = lba + 1;
1615 sdkp->hw_sector_size = sector_size;
1616 return sector_size;
1617 }
1618
1619 static int sd_try_rc16_first(struct scsi_device *sdp)
1620 {
1621 if (sdp->host->max_cmd_len < 16)
1622 return 0;
1623 if (sdp->scsi_level > SCSI_SPC_2)
1624 return 1;
1625 if (scsi_device_protection(sdp))
1626 return 1;
1627 return 0;
1628 }
1629
1630 /*
1631 * read disk capacity
1632 */
1633 static void
1634 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1635 {
1636 int sector_size;
1637 struct scsi_device *sdp = sdkp->device;
1638 sector_t old_capacity = sdkp->capacity;
1639
1640 if (sd_try_rc16_first(sdp)) {
1641 sector_size = read_capacity_16(sdkp, sdp, buffer);
1642 if (sector_size == -EOVERFLOW)
1643 goto got_data;
1644 if (sector_size == -ENODEV)
1645 return;
1646 if (sector_size < 0)
1647 sector_size = read_capacity_10(sdkp, sdp, buffer);
1648 if (sector_size < 0)
1649 return;
1650 } else {
1651 sector_size = read_capacity_10(sdkp, sdp, buffer);
1652 if (sector_size == -EOVERFLOW)
1653 goto got_data;
1654 if (sector_size < 0)
1655 return;
1656 if ((sizeof(sdkp->capacity) > 4) &&
1657 (sdkp->capacity > 0xffffffffULL)) {
1658 int old_sector_size = sector_size;
1659 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1660 "Trying to use READ CAPACITY(16).\n");
1661 sector_size = read_capacity_16(sdkp, sdp, buffer);
1662 if (sector_size < 0) {
1663 sd_printk(KERN_NOTICE, sdkp,
1664 "Using 0xffffffff as device size\n");
1665 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1666 sector_size = old_sector_size;
1667 goto got_data;
1668 }
1669 }
1670 }
1671
1672 /* Some devices are known to return the total number of blocks,
1673 * not the highest block number. Some devices have versions
1674 * which do this and others which do not. Some devices we might
1675 * suspect of doing this but we don't know for certain.
1676 *
1677 * If we know the reported capacity is wrong, decrement it. If
1678 * we can only guess, then assume the number of blocks is even
1679 * (usually true but not always) and err on the side of lowering
1680 * the capacity.
1681 */
1682 if (sdp->fix_capacity ||
1683 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1684 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1685 "from its reported value: %llu\n",
1686 (unsigned long long) sdkp->capacity);
1687 --sdkp->capacity;
1688 }
1689
1690 got_data:
1691 if (sector_size == 0) {
1692 sector_size = 512;
1693 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1694 "assuming 512.\n");
1695 }
1696
1697 if (sector_size != 512 &&
1698 sector_size != 1024 &&
1699 sector_size != 2048 &&
1700 sector_size != 4096 &&
1701 sector_size != 256) {
1702 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1703 sector_size);
1704 /*
1705 * The user might want to re-format the drive with
1706 * a supported sectorsize. Once this happens, it
1707 * would be relatively trivial to set the thing up.
1708 * For this reason, we leave the thing in the table.
1709 */
1710 sdkp->capacity = 0;
1711 /*
1712 * set a bogus sector size so the normal read/write
1713 * logic in the block layer will eventually refuse any
1714 * request on this device without tripping over power
1715 * of two sector size assumptions
1716 */
1717 sector_size = 512;
1718 }
1719 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1720
1721 {
1722 char cap_str_2[10], cap_str_10[10];
1723 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1724
1725 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1726 sizeof(cap_str_2));
1727 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1728 sizeof(cap_str_10));
1729
1730 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1731 sd_printk(KERN_NOTICE, sdkp,
1732 "%llu %d-byte logical blocks: (%s/%s)\n",
1733 (unsigned long long)sdkp->capacity,
1734 sector_size, cap_str_10, cap_str_2);
1735
1736 if (sdkp->hw_sector_size != sector_size)
1737 sd_printk(KERN_NOTICE, sdkp,
1738 "%u-byte physical blocks\n",
1739 sdkp->hw_sector_size);
1740 }
1741 }
1742
1743 /* Rescale capacity to 512-byte units */
1744 if (sector_size == 4096)
1745 sdkp->capacity <<= 3;
1746 else if (sector_size == 2048)
1747 sdkp->capacity <<= 2;
1748 else if (sector_size == 1024)
1749 sdkp->capacity <<= 1;
1750 else if (sector_size == 256)
1751 sdkp->capacity >>= 1;
1752
1753 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1754 sdkp->device->sector_size = sector_size;
1755 }
1756
1757 /* called with buffer of length 512 */
1758 static inline int
1759 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1760 unsigned char *buffer, int len, struct scsi_mode_data *data,
1761 struct scsi_sense_hdr *sshdr)
1762 {
1763 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1764 SD_TIMEOUT, SD_MAX_RETRIES, data,
1765 sshdr);
1766 }
1767
1768 /*
1769 * read write protect setting, if possible - called only in sd_revalidate_disk()
1770 * called with buffer of length SD_BUF_SIZE
1771 */
1772 static void
1773 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1774 {
1775 int res;
1776 struct scsi_device *sdp = sdkp->device;
1777 struct scsi_mode_data data;
1778 int old_wp = sdkp->write_prot;
1779
1780 set_disk_ro(sdkp->disk, 0);
1781 if (sdp->skip_ms_page_3f) {
1782 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1783 return;
1784 }
1785
1786 if (sdp->use_192_bytes_for_3f) {
1787 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1788 } else {
1789 /*
1790 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1791 * We have to start carefully: some devices hang if we ask
1792 * for more than is available.
1793 */
1794 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1795
1796 /*
1797 * Second attempt: ask for page 0 When only page 0 is
1798 * implemented, a request for page 3F may return Sense Key
1799 * 5: Illegal Request, Sense Code 24: Invalid field in
1800 * CDB.
1801 */
1802 if (!scsi_status_is_good(res))
1803 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1804
1805 /*
1806 * Third attempt: ask 255 bytes, as we did earlier.
1807 */
1808 if (!scsi_status_is_good(res))
1809 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1810 &data, NULL);
1811 }
1812
1813 if (!scsi_status_is_good(res)) {
1814 sd_printk(KERN_WARNING, sdkp,
1815 "Test WP failed, assume Write Enabled\n");
1816 } else {
1817 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1818 set_disk_ro(sdkp->disk, sdkp->write_prot);
1819 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1820 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1821 sdkp->write_prot ? "on" : "off");
1822 sd_printk(KERN_DEBUG, sdkp,
1823 "Mode Sense: %02x %02x %02x %02x\n",
1824 buffer[0], buffer[1], buffer[2], buffer[3]);
1825 }
1826 }
1827 }
1828
1829 /*
1830 * sd_read_cache_type - called only from sd_revalidate_disk()
1831 * called with buffer of length SD_BUF_SIZE
1832 */
1833 static void
1834 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1835 {
1836 int len = 0, res;
1837 struct scsi_device *sdp = sdkp->device;
1838
1839 int dbd;
1840 int modepage;
1841 struct scsi_mode_data data;
1842 struct scsi_sense_hdr sshdr;
1843 int old_wce = sdkp->WCE;
1844 int old_rcd = sdkp->RCD;
1845 int old_dpofua = sdkp->DPOFUA;
1846
1847 if (sdp->skip_ms_page_8)
1848 goto defaults;
1849
1850 if (sdp->type == TYPE_RBC) {
1851 modepage = 6;
1852 dbd = 8;
1853 } else {
1854 modepage = 8;
1855 dbd = 0;
1856 }
1857
1858 /* cautiously ask */
1859 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1860
1861 if (!scsi_status_is_good(res))
1862 goto bad_sense;
1863
1864 if (!data.header_length) {
1865 modepage = 6;
1866 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1867 }
1868
1869 /* that went OK, now ask for the proper length */
1870 len = data.length;
1871
1872 /*
1873 * We're only interested in the first three bytes, actually.
1874 * But the data cache page is defined for the first 20.
1875 */
1876 if (len < 3)
1877 goto bad_sense;
1878 if (len > 20)
1879 len = 20;
1880
1881 /* Take headers and block descriptors into account */
1882 len += data.header_length + data.block_descriptor_length;
1883 if (len > SD_BUF_SIZE)
1884 goto bad_sense;
1885
1886 /* Get the data */
1887 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1888
1889 if (scsi_status_is_good(res)) {
1890 int offset = data.header_length + data.block_descriptor_length;
1891
1892 if (offset >= SD_BUF_SIZE - 2) {
1893 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1894 goto defaults;
1895 }
1896
1897 if ((buffer[offset] & 0x3f) != modepage) {
1898 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1899 goto defaults;
1900 }
1901
1902 if (modepage == 8) {
1903 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1904 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1905 } else {
1906 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1907 sdkp->RCD = 0;
1908 }
1909
1910 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1911 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1912 sd_printk(KERN_NOTICE, sdkp,
1913 "Uses READ/WRITE(6), disabling FUA\n");
1914 sdkp->DPOFUA = 0;
1915 }
1916
1917 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1918 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1919 sd_printk(KERN_NOTICE, sdkp,
1920 "Write cache: %s, read cache: %s, %s\n",
1921 sdkp->WCE ? "enabled" : "disabled",
1922 sdkp->RCD ? "disabled" : "enabled",
1923 sdkp->DPOFUA ? "supports DPO and FUA"
1924 : "doesn't support DPO or FUA");
1925
1926 return;
1927 }
1928
1929 bad_sense:
1930 if (scsi_sense_valid(&sshdr) &&
1931 sshdr.sense_key == ILLEGAL_REQUEST &&
1932 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1933 /* Invalid field in CDB */
1934 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1935 else
1936 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1937
1938 defaults:
1939 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1940 sdkp->WCE = 0;
1941 sdkp->RCD = 0;
1942 sdkp->DPOFUA = 0;
1943 }
1944
1945 /*
1946 * The ATO bit indicates whether the DIF application tag is available
1947 * for use by the operating system.
1948 */
1949 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1950 {
1951 int res, offset;
1952 struct scsi_device *sdp = sdkp->device;
1953 struct scsi_mode_data data;
1954 struct scsi_sense_hdr sshdr;
1955
1956 if (sdp->type != TYPE_DISK)
1957 return;
1958
1959 if (sdkp->protection_type == 0)
1960 return;
1961
1962 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1963 SD_MAX_RETRIES, &data, &sshdr);
1964
1965 if (!scsi_status_is_good(res) || !data.header_length ||
1966 data.length < 6) {
1967 sd_printk(KERN_WARNING, sdkp,
1968 "getting Control mode page failed, assume no ATO\n");
1969
1970 if (scsi_sense_valid(&sshdr))
1971 sd_print_sense_hdr(sdkp, &sshdr);
1972
1973 return;
1974 }
1975
1976 offset = data.header_length + data.block_descriptor_length;
1977
1978 if ((buffer[offset] & 0x3f) != 0x0a) {
1979 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1980 return;
1981 }
1982
1983 if ((buffer[offset + 5] & 0x80) == 0)
1984 return;
1985
1986 sdkp->ATO = 1;
1987
1988 return;
1989 }
1990
1991 /**
1992 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1993 * @disk: disk to query
1994 */
1995 static void sd_read_block_limits(struct scsi_disk *sdkp)
1996 {
1997 struct request_queue *q = sdkp->disk->queue;
1998 unsigned int sector_sz = sdkp->device->sector_size;
1999 const int vpd_len = 64;
2000 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2001
2002 if (!buffer ||
2003 /* Block Limits VPD */
2004 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2005 goto out;
2006
2007 blk_queue_io_min(sdkp->disk->queue,
2008 get_unaligned_be16(&buffer[6]) * sector_sz);
2009 blk_queue_io_opt(sdkp->disk->queue,
2010 get_unaligned_be32(&buffer[12]) * sector_sz);
2011
2012 /* Thin provisioning enabled and page length indicates TP support */
2013 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2014 unsigned int lba_count, desc_count, granularity;
2015
2016 lba_count = get_unaligned_be32(&buffer[20]);
2017 desc_count = get_unaligned_be32(&buffer[24]);
2018
2019 if (lba_count) {
2020 q->limits.max_discard_sectors =
2021 lba_count * sector_sz >> 9;
2022
2023 if (desc_count)
2024 sdkp->unmap = 1;
2025 }
2026
2027 granularity = get_unaligned_be32(&buffer[28]);
2028
2029 if (granularity)
2030 q->limits.discard_granularity = granularity * sector_sz;
2031
2032 if (buffer[32] & 0x80)
2033 q->limits.discard_alignment =
2034 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2035 }
2036
2037 out:
2038 kfree(buffer);
2039 }
2040
2041 /**
2042 * sd_read_block_characteristics - Query block dev. characteristics
2043 * @disk: disk to query
2044 */
2045 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2046 {
2047 unsigned char *buffer;
2048 u16 rot;
2049 const int vpd_len = 64;
2050
2051 buffer = kmalloc(vpd_len, GFP_KERNEL);
2052
2053 if (!buffer ||
2054 /* Block Device Characteristics VPD */
2055 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2056 goto out;
2057
2058 rot = get_unaligned_be16(&buffer[4]);
2059
2060 if (rot == 1)
2061 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2062
2063 out:
2064 kfree(buffer);
2065 }
2066
2067 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2068 {
2069 /*
2070 * Although VPD inquiries can go to SCSI-2 type devices,
2071 * some USB ones crash on receiving them, and the pages
2072 * we currently ask for are for SPC-3 and beyond
2073 */
2074 if (sdp->scsi_level > SCSI_SPC_2)
2075 return 1;
2076 return 0;
2077 }
2078
2079 /**
2080 * sd_revalidate_disk - called the first time a new disk is seen,
2081 * performs disk spin up, read_capacity, etc.
2082 * @disk: struct gendisk we care about
2083 **/
2084 static int sd_revalidate_disk(struct gendisk *disk)
2085 {
2086 struct scsi_disk *sdkp = scsi_disk(disk);
2087 struct scsi_device *sdp = sdkp->device;
2088 unsigned char *buffer;
2089 unsigned ordered;
2090
2091 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2092 "sd_revalidate_disk\n"));
2093
2094 /*
2095 * If the device is offline, don't try and read capacity or any
2096 * of the other niceties.
2097 */
2098 if (!scsi_device_online(sdp))
2099 goto out;
2100
2101 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2102 if (!buffer) {
2103 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2104 "allocation failure.\n");
2105 goto out;
2106 }
2107
2108 sd_spinup_disk(sdkp);
2109
2110 /*
2111 * Without media there is no reason to ask; moreover, some devices
2112 * react badly if we do.
2113 */
2114 if (sdkp->media_present) {
2115 sd_read_capacity(sdkp, buffer);
2116
2117 if (sd_try_extended_inquiry(sdp)) {
2118 sd_read_block_limits(sdkp);
2119 sd_read_block_characteristics(sdkp);
2120 }
2121
2122 sd_read_write_protect_flag(sdkp, buffer);
2123 sd_read_cache_type(sdkp, buffer);
2124 sd_read_app_tag_own(sdkp, buffer);
2125 }
2126
2127 sdkp->first_scan = 0;
2128
2129 /*
2130 * We now have all cache related info, determine how we deal
2131 * with ordered requests. Note that as the current SCSI
2132 * dispatch function can alter request order, we cannot use
2133 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2134 */
2135 if (sdkp->WCE)
2136 ordered = sdkp->DPOFUA
2137 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2138 else
2139 ordered = QUEUE_ORDERED_DRAIN;
2140
2141 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
2142
2143 set_capacity(disk, sdkp->capacity);
2144 kfree(buffer);
2145
2146 out:
2147 return 0;
2148 }
2149
2150 /**
2151 * sd_unlock_native_capacity - unlock native capacity
2152 * @disk: struct gendisk to set capacity for
2153 *
2154 * Block layer calls this function if it detects that partitions
2155 * on @disk reach beyond the end of the device. If the SCSI host
2156 * implements ->unlock_native_capacity() method, it's invoked to
2157 * give it a chance to adjust the device capacity.
2158 *
2159 * CONTEXT:
2160 * Defined by block layer. Might sleep.
2161 */
2162 static void sd_unlock_native_capacity(struct gendisk *disk)
2163 {
2164 struct scsi_device *sdev = scsi_disk(disk)->device;
2165
2166 if (sdev->host->hostt->unlock_native_capacity)
2167 sdev->host->hostt->unlock_native_capacity(sdev);
2168 }
2169
2170 /**
2171 * sd_format_disk_name - format disk name
2172 * @prefix: name prefix - ie. "sd" for SCSI disks
2173 * @index: index of the disk to format name for
2174 * @buf: output buffer
2175 * @buflen: length of the output buffer
2176 *
2177 * SCSI disk names starts at sda. The 26th device is sdz and the
2178 * 27th is sdaa. The last one for two lettered suffix is sdzz
2179 * which is followed by sdaaa.
2180 *
2181 * This is basically 26 base counting with one extra 'nil' entry
2182 * at the beginning from the second digit on and can be
2183 * determined using similar method as 26 base conversion with the
2184 * index shifted -1 after each digit is computed.
2185 *
2186 * CONTEXT:
2187 * Don't care.
2188 *
2189 * RETURNS:
2190 * 0 on success, -errno on failure.
2191 */
2192 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2193 {
2194 const int base = 'z' - 'a' + 1;
2195 char *begin = buf + strlen(prefix);
2196 char *end = buf + buflen;
2197 char *p;
2198 int unit;
2199
2200 p = end - 1;
2201 *p = '\0';
2202 unit = base;
2203 do {
2204 if (p == begin)
2205 return -EINVAL;
2206 *--p = 'a' + (index % unit);
2207 index = (index / unit) - 1;
2208 } while (index >= 0);
2209
2210 memmove(begin, p, end - p);
2211 memcpy(buf, prefix, strlen(prefix));
2212
2213 return 0;
2214 }
2215
2216 /*
2217 * The asynchronous part of sd_probe
2218 */
2219 static void sd_probe_async(void *data, async_cookie_t cookie)
2220 {
2221 struct scsi_disk *sdkp = data;
2222 struct scsi_device *sdp;
2223 struct gendisk *gd;
2224 u32 index;
2225 struct device *dev;
2226
2227 sdp = sdkp->device;
2228 gd = sdkp->disk;
2229 index = sdkp->index;
2230 dev = &sdp->sdev_gendev;
2231
2232 if (index < SD_MAX_DISKS) {
2233 gd->major = sd_major((index & 0xf0) >> 4);
2234 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2235 gd->minors = SD_MINORS;
2236 }
2237 gd->fops = &sd_fops;
2238 gd->private_data = &sdkp->driver;
2239 gd->queue = sdkp->device->request_queue;
2240
2241 /* defaults, until the device tells us otherwise */
2242 sdp->sector_size = 512;
2243 sdkp->capacity = 0;
2244 sdkp->media_present = 1;
2245 sdkp->write_prot = 0;
2246 sdkp->WCE = 0;
2247 sdkp->RCD = 0;
2248 sdkp->ATO = 0;
2249 sdkp->first_scan = 1;
2250
2251 sd_revalidate_disk(gd);
2252
2253 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2254 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2255
2256 gd->driverfs_dev = &sdp->sdev_gendev;
2257 gd->flags = GENHD_FL_EXT_DEVT;
2258 if (sdp->removable)
2259 gd->flags |= GENHD_FL_REMOVABLE;
2260
2261 dev_set_drvdata(dev, sdkp);
2262 add_disk(gd);
2263 sd_dif_config_host(sdkp);
2264
2265 sd_revalidate_disk(gd);
2266
2267 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2268 sdp->removable ? "removable " : "");
2269 put_device(&sdkp->dev);
2270 }
2271
2272 /**
2273 * sd_probe - called during driver initialization and whenever a
2274 * new scsi device is attached to the system. It is called once
2275 * for each scsi device (not just disks) present.
2276 * @dev: pointer to device object
2277 *
2278 * Returns 0 if successful (or not interested in this scsi device
2279 * (e.g. scanner)); 1 when there is an error.
2280 *
2281 * Note: this function is invoked from the scsi mid-level.
2282 * This function sets up the mapping between a given
2283 * <host,channel,id,lun> (found in sdp) and new device name
2284 * (e.g. /dev/sda). More precisely it is the block device major
2285 * and minor number that is chosen here.
2286 *
2287 * Assume sd_attach is not re-entrant (for time being)
2288 * Also think about sd_attach() and sd_remove() running coincidentally.
2289 **/
2290 static int sd_probe(struct device *dev)
2291 {
2292 struct scsi_device *sdp = to_scsi_device(dev);
2293 struct scsi_disk *sdkp;
2294 struct gendisk *gd;
2295 u32 index;
2296 int error;
2297
2298 error = -ENODEV;
2299 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2300 goto out;
2301
2302 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2303 "sd_attach\n"));
2304
2305 error = -ENOMEM;
2306 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2307 if (!sdkp)
2308 goto out;
2309
2310 gd = alloc_disk(SD_MINORS);
2311 if (!gd)
2312 goto out_free;
2313
2314 do {
2315 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2316 goto out_put;
2317
2318 spin_lock(&sd_index_lock);
2319 error = ida_get_new(&sd_index_ida, &index);
2320 spin_unlock(&sd_index_lock);
2321 } while (error == -EAGAIN);
2322
2323 if (error)
2324 goto out_put;
2325
2326 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2327 if (error)
2328 goto out_free_index;
2329
2330 sdkp->device = sdp;
2331 sdkp->driver = &sd_template;
2332 sdkp->disk = gd;
2333 sdkp->index = index;
2334 sdkp->openers = 0;
2335 sdkp->previous_state = 1;
2336
2337 if (!sdp->request_queue->rq_timeout) {
2338 if (sdp->type != TYPE_MOD)
2339 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2340 else
2341 blk_queue_rq_timeout(sdp->request_queue,
2342 SD_MOD_TIMEOUT);
2343 }
2344
2345 device_initialize(&sdkp->dev);
2346 sdkp->dev.parent = &sdp->sdev_gendev;
2347 sdkp->dev.class = &sd_disk_class;
2348 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2349
2350 if (device_add(&sdkp->dev))
2351 goto out_free_index;
2352
2353 get_device(&sdp->sdev_gendev);
2354
2355 get_device(&sdkp->dev); /* prevent release before async_schedule */
2356 async_schedule(sd_probe_async, sdkp);
2357
2358 return 0;
2359
2360 out_free_index:
2361 spin_lock(&sd_index_lock);
2362 ida_remove(&sd_index_ida, index);
2363 spin_unlock(&sd_index_lock);
2364 out_put:
2365 put_disk(gd);
2366 out_free:
2367 kfree(sdkp);
2368 out:
2369 return error;
2370 }
2371
2372 /**
2373 * sd_remove - called whenever a scsi disk (previously recognized by
2374 * sd_probe) is detached from the system. It is called (potentially
2375 * multiple times) during sd module unload.
2376 * @sdp: pointer to mid level scsi device object
2377 *
2378 * Note: this function is invoked from the scsi mid-level.
2379 * This function potentially frees up a device name (e.g. /dev/sdc)
2380 * that could be re-used by a subsequent sd_probe().
2381 * This function is not called when the built-in sd driver is "exit-ed".
2382 **/
2383 static int sd_remove(struct device *dev)
2384 {
2385 struct scsi_disk *sdkp;
2386
2387 async_synchronize_full();
2388 sdkp = dev_get_drvdata(dev);
2389 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2390 device_del(&sdkp->dev);
2391 del_gendisk(sdkp->disk);
2392 sd_shutdown(dev);
2393
2394 mutex_lock(&sd_ref_mutex);
2395 dev_set_drvdata(dev, NULL);
2396 put_device(&sdkp->dev);
2397 mutex_unlock(&sd_ref_mutex);
2398
2399 return 0;
2400 }
2401
2402 /**
2403 * scsi_disk_release - Called to free the scsi_disk structure
2404 * @dev: pointer to embedded class device
2405 *
2406 * sd_ref_mutex must be held entering this routine. Because it is
2407 * called on last put, you should always use the scsi_disk_get()
2408 * scsi_disk_put() helpers which manipulate the semaphore directly
2409 * and never do a direct put_device.
2410 **/
2411 static void scsi_disk_release(struct device *dev)
2412 {
2413 struct scsi_disk *sdkp = to_scsi_disk(dev);
2414 struct gendisk *disk = sdkp->disk;
2415
2416 spin_lock(&sd_index_lock);
2417 ida_remove(&sd_index_ida, sdkp->index);
2418 spin_unlock(&sd_index_lock);
2419
2420 disk->private_data = NULL;
2421 put_disk(disk);
2422 put_device(&sdkp->device->sdev_gendev);
2423
2424 kfree(sdkp);
2425 }
2426
2427 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2428 {
2429 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2430 struct scsi_sense_hdr sshdr;
2431 struct scsi_device *sdp = sdkp->device;
2432 int res;
2433
2434 if (start)
2435 cmd[4] |= 1; /* START */
2436
2437 if (sdp->start_stop_pwr_cond)
2438 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2439
2440 if (!scsi_device_online(sdp))
2441 return -ENODEV;
2442
2443 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2444 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2445 if (res) {
2446 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2447 sd_print_result(sdkp, res);
2448 if (driver_byte(res) & DRIVER_SENSE)
2449 sd_print_sense_hdr(sdkp, &sshdr);
2450 }
2451
2452 return res;
2453 }
2454
2455 /*
2456 * Send a SYNCHRONIZE CACHE instruction down to the device through
2457 * the normal SCSI command structure. Wait for the command to
2458 * complete.
2459 */
2460 static void sd_shutdown(struct device *dev)
2461 {
2462 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2463
2464 if (!sdkp)
2465 return; /* this can happen */
2466
2467 if (sdkp->WCE) {
2468 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2469 sd_sync_cache(sdkp);
2470 }
2471
2472 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2473 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2474 sd_start_stop_device(sdkp, 0);
2475 }
2476
2477 scsi_disk_put(sdkp);
2478 }
2479
2480 static int sd_suspend(struct device *dev, pm_message_t mesg)
2481 {
2482 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2483 int ret = 0;
2484
2485 if (!sdkp)
2486 return 0; /* this can happen */
2487
2488 if (sdkp->WCE) {
2489 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2490 ret = sd_sync_cache(sdkp);
2491 if (ret)
2492 goto done;
2493 }
2494
2495 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2496 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2497 ret = sd_start_stop_device(sdkp, 0);
2498 }
2499
2500 done:
2501 scsi_disk_put(sdkp);
2502 return ret;
2503 }
2504
2505 static int sd_resume(struct device *dev)
2506 {
2507 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2508 int ret = 0;
2509
2510 if (!sdkp->device->manage_start_stop)
2511 goto done;
2512
2513 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2514 ret = sd_start_stop_device(sdkp, 1);
2515
2516 done:
2517 scsi_disk_put(sdkp);
2518 return ret;
2519 }
2520
2521 /**
2522 * init_sd - entry point for this driver (both when built in or when
2523 * a module).
2524 *
2525 * Note: this function registers this driver with the scsi mid-level.
2526 **/
2527 static int __init init_sd(void)
2528 {
2529 int majors = 0, i, err;
2530
2531 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2532
2533 for (i = 0; i < SD_MAJORS; i++)
2534 if (register_blkdev(sd_major(i), "sd") == 0)
2535 majors++;
2536
2537 if (!majors)
2538 return -ENODEV;
2539
2540 err = class_register(&sd_disk_class);
2541 if (err)
2542 goto err_out;
2543
2544 err = scsi_register_driver(&sd_template.gendrv);
2545 if (err)
2546 goto err_out_class;
2547
2548 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2549 0, 0, NULL);
2550 if (!sd_cdb_cache) {
2551 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2552 goto err_out_class;
2553 }
2554
2555 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2556 if (!sd_cdb_pool) {
2557 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2558 goto err_out_cache;
2559 }
2560
2561 return 0;
2562
2563 err_out_cache:
2564 kmem_cache_destroy(sd_cdb_cache);
2565
2566 err_out_class:
2567 class_unregister(&sd_disk_class);
2568 err_out:
2569 for (i = 0; i < SD_MAJORS; i++)
2570 unregister_blkdev(sd_major(i), "sd");
2571 return err;
2572 }
2573
2574 /**
2575 * exit_sd - exit point for this driver (when it is a module).
2576 *
2577 * Note: this function unregisters this driver from the scsi mid-level.
2578 **/
2579 static void __exit exit_sd(void)
2580 {
2581 int i;
2582
2583 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2584
2585 mempool_destroy(sd_cdb_pool);
2586 kmem_cache_destroy(sd_cdb_cache);
2587
2588 scsi_unregister_driver(&sd_template.gendrv);
2589 class_unregister(&sd_disk_class);
2590
2591 for (i = 0; i < SD_MAJORS; i++)
2592 unregister_blkdev(sd_major(i), "sd");
2593 }
2594
2595 module_init(init_sd);
2596 module_exit(exit_sd);
2597
2598 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2599 struct scsi_sense_hdr *sshdr)
2600 {
2601 sd_printk(KERN_INFO, sdkp, "");
2602 scsi_show_sense_hdr(sshdr);
2603 sd_printk(KERN_INFO, sdkp, "");
2604 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2605 }
2606
2607 static void sd_print_result(struct scsi_disk *sdkp, int result)
2608 {
2609 sd_printk(KERN_INFO, sdkp, "");
2610 scsi_show_result(result);
2611 }
2612
CJK support for tty framebuffer vt