2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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.
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.
35 #include <linux/module.h>
37 #include <linux/kernel.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>
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>
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend(struct device *);
109 static int sd_resume(struct device *);
110 static void sd_rescan(struct device *);
111 static int sd_done(struct scsi_cmnd *);
112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
114 static void scsi_disk_release(struct device *cdev);
115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116 static void sd_print_result(struct scsi_disk *, int);
118 static DEFINE_SPINLOCK(sd_index_lock);
119 static DEFINE_IDA(sd_index_ida);
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex);
126 static struct kmem_cache *sd_cdb_cache;
127 static mempool_t *sd_cdb_pool;
129 static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
135 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
138 int i, ct = -1, rcd, wce, sp;
139 struct scsi_disk *sdkp = to_scsi_disk(dev);
140 struct scsi_device *sdp = sdkp->device;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
145 const char *temp = "temporary ";
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
158 sdkp->cache_override = 0;
161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
162 len = strlen(sd_cache_types[i]);
163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
174 if (sdkp->cache_override) {
180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
194 sd_print_sense_hdr(sdkp, &sshdr);
197 revalidate_disk(sdkp->disk);
202 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
205 struct scsi_disk *sdkp = to_scsi_disk(dev);
206 struct scsi_device *sdp = sdkp->device;
208 if (!capable(CAP_SYS_ADMIN))
211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
217 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
220 struct scsi_disk *sdkp = to_scsi_disk(dev);
221 struct scsi_device *sdp = sdkp->device;
223 if (!capable(CAP_SYS_ADMIN))
226 if (sdp->type != TYPE_DISK)
229 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
235 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 int ct = sdkp->RCD + 2*sdkp->WCE;
241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
245 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
253 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 struct scsi_device *sdp = sdkp->device;
259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
263 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
266 struct scsi_disk *sdkp = to_scsi_disk(dev);
268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
272 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
275 struct scsi_disk *sdkp = to_scsi_disk(dev);
277 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
281 sd_store_protection_type(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
288 if (!capable(CAP_SYS_ADMIN))
291 err = kstrtouint(buf, 10, &val);
296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
297 sdkp->protection_type = val;
303 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
306 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 struct scsi_device *sdp = sdkp->device;
308 unsigned int dif, dix;
310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
319 return snprintf(buf, 20, "none\n");
321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
325 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
330 return snprintf(buf, 20, "%u\n", sdkp->ATO);
334 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
339 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
342 static const char *lbp_mode[] = {
343 [SD_LBP_FULL] = "full",
344 [SD_LBP_UNMAP] = "unmap",
345 [SD_LBP_WS16] = "writesame_16",
346 [SD_LBP_WS10] = "writesame_10",
347 [SD_LBP_ZERO] = "writesame_zero",
348 [SD_LBP_DISABLE] = "disabled",
352 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
361 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t count)
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
365 struct scsi_device *sdp = sdkp->device;
367 if (!capable(CAP_SYS_ADMIN))
370 if (sdp->type != TYPE_DISK)
373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
374 sd_config_discard(sdkp, SD_LBP_UNMAP);
375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
376 sd_config_discard(sdkp, SD_LBP_WS16);
377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
378 sd_config_discard(sdkp, SD_LBP_WS10);
379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
380 sd_config_discard(sdkp, SD_LBP_ZERO);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
382 sd_config_discard(sdkp, SD_LBP_DISABLE);
390 sd_show_max_medium_access_timeouts(struct device *dev,
391 struct device_attribute *attr, char *buf)
393 struct scsi_disk *sdkp = to_scsi_disk(dev);
395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
399 sd_store_max_medium_access_timeouts(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
406 if (!capable(CAP_SYS_ADMIN))
409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
411 return err ? err : count;
415 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
424 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428 struct scsi_device *sdp = sdkp->device;
432 if (!capable(CAP_SYS_ADMIN))
435 if (sdp->type != TYPE_DISK)
438 err = kstrtoul(buf, 10, &max);
444 sdp->no_write_same = 1;
445 else if (max <= SD_MAX_WS16_BLOCKS)
446 sdkp->max_ws_blocks = max;
448 sd_config_write_same(sdkp);
453 static struct device_attribute sd_disk_attrs[] = {
454 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
455 sd_store_cache_type),
456 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
457 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
458 sd_store_allow_restart),
459 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
460 sd_store_manage_start_stop),
461 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
462 sd_store_protection_type),
463 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
464 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
465 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
466 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
467 sd_store_provisioning_mode),
468 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
469 sd_show_write_same_blocks, sd_store_write_same_blocks),
470 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
471 sd_show_max_medium_access_timeouts,
472 sd_store_max_medium_access_timeouts),
476 static struct class sd_disk_class = {
478 .owner = THIS_MODULE,
479 .dev_release = scsi_disk_release,
480 .dev_attrs = sd_disk_attrs,
483 static const struct dev_pm_ops sd_pm_ops = {
484 .suspend = sd_suspend,
486 .poweroff = sd_suspend,
487 .restore = sd_resume,
488 .runtime_suspend = sd_suspend,
489 .runtime_resume = sd_resume,
492 static struct scsi_driver sd_template = {
493 .owner = THIS_MODULE,
498 .shutdown = sd_shutdown,
503 .eh_action = sd_eh_action,
507 * Device no to disk mapping:
509 * major disc2 disc p1
510 * |............|.............|....|....| <- dev_t
513 * Inside a major, we have 16k disks, however mapped non-
514 * contiguously. The first 16 disks are for major0, the next
515 * ones with major1, ... Disk 256 is for major0 again, disk 272
517 * As we stay compatible with our numbering scheme, we can reuse
518 * the well-know SCSI majors 8, 65--71, 136--143.
520 static int sd_major(int major_idx)
524 return SCSI_DISK0_MAJOR;
526 return SCSI_DISK1_MAJOR + major_idx - 1;
528 return SCSI_DISK8_MAJOR + major_idx - 8;
531 return 0; /* shut up gcc */
535 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
537 struct scsi_disk *sdkp = NULL;
539 if (disk->private_data) {
540 sdkp = scsi_disk(disk);
541 if (scsi_device_get(sdkp->device) == 0)
542 get_device(&sdkp->dev);
549 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
551 struct scsi_disk *sdkp;
553 mutex_lock(&sd_ref_mutex);
554 sdkp = __scsi_disk_get(disk);
555 mutex_unlock(&sd_ref_mutex);
559 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
561 struct scsi_disk *sdkp;
563 mutex_lock(&sd_ref_mutex);
564 sdkp = dev_get_drvdata(dev);
566 sdkp = __scsi_disk_get(sdkp->disk);
567 mutex_unlock(&sd_ref_mutex);
571 static void scsi_disk_put(struct scsi_disk *sdkp)
573 struct scsi_device *sdev = sdkp->device;
575 mutex_lock(&sd_ref_mutex);
576 put_device(&sdkp->dev);
577 scsi_device_put(sdev);
578 mutex_unlock(&sd_ref_mutex);
581 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
583 unsigned int prot_op = SCSI_PROT_NORMAL;
584 unsigned int dix = scsi_prot_sg_count(scmd);
586 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
588 prot_op = SCSI_PROT_READ_PASS;
589 else if (dif && !dix)
590 prot_op = SCSI_PROT_READ_STRIP;
591 else if (!dif && dix)
592 prot_op = SCSI_PROT_READ_INSERT;
595 prot_op = SCSI_PROT_WRITE_PASS;
596 else if (dif && !dix)
597 prot_op = SCSI_PROT_WRITE_INSERT;
598 else if (!dif && dix)
599 prot_op = SCSI_PROT_WRITE_STRIP;
602 scsi_set_prot_op(scmd, prot_op);
603 scsi_set_prot_type(scmd, dif);
606 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
608 struct request_queue *q = sdkp->disk->queue;
609 unsigned int logical_block_size = sdkp->device->sector_size;
610 unsigned int max_blocks = 0;
612 q->limits.discard_zeroes_data = sdkp->lbprz;
613 q->limits.discard_alignment = sdkp->unmap_alignment *
615 q->limits.discard_granularity =
616 max(sdkp->physical_block_size,
617 sdkp->unmap_granularity * logical_block_size);
619 sdkp->provisioning_mode = mode;
624 q->limits.max_discard_sectors = 0;
625 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
629 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
630 (u32)SD_MAX_WS16_BLOCKS);
634 max_blocks = min_not_zero(sdkp->max_ws_blocks,
635 (u32)SD_MAX_WS16_BLOCKS);
639 max_blocks = min_not_zero(sdkp->max_ws_blocks,
640 (u32)SD_MAX_WS10_BLOCKS);
644 max_blocks = min_not_zero(sdkp->max_ws_blocks,
645 (u32)SD_MAX_WS10_BLOCKS);
646 q->limits.discard_zeroes_data = 1;
650 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
651 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
656 * @sdp: scsi device to operate one
657 * @rq: Request to prepare
659 * Will issue either UNMAP or WRITE SAME(16) depending on preference
660 * indicated by target device.
662 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
664 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
665 sector_t sector = blk_rq_pos(rq);
666 unsigned int nr_sectors = blk_rq_sectors(rq);
667 unsigned int nr_bytes = blk_rq_bytes(rq);
673 sector >>= ilog2(sdp->sector_size) - 9;
674 nr_sectors >>= ilog2(sdp->sector_size) - 9;
675 rq->timeout = SD_TIMEOUT;
677 memset(rq->cmd, 0, rq->cmd_len);
679 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
681 return BLKPREP_DEFER;
683 switch (sdkp->provisioning_mode) {
685 buf = page_address(page);
691 put_unaligned_be16(6 + 16, &buf[0]);
692 put_unaligned_be16(16, &buf[2]);
693 put_unaligned_be64(sector, &buf[8]);
694 put_unaligned_be32(nr_sectors, &buf[16]);
701 rq->cmd[0] = WRITE_SAME_16;
702 rq->cmd[1] = 0x8; /* UNMAP */
703 put_unaligned_be64(sector, &rq->cmd[2]);
704 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
706 len = sdkp->device->sector_size;
712 rq->cmd[0] = WRITE_SAME;
713 if (sdkp->provisioning_mode == SD_LBP_WS10)
714 rq->cmd[1] = 0x8; /* UNMAP */
715 put_unaligned_be32(sector, &rq->cmd[2]);
716 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
718 len = sdkp->device->sector_size;
726 blk_add_request_payload(rq, page, len);
727 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
728 rq->buffer = page_address(page);
729 rq->__data_len = nr_bytes;
732 if (ret != BLKPREP_OK) {
739 static void sd_config_write_same(struct scsi_disk *sdkp)
741 struct request_queue *q = sdkp->disk->queue;
742 unsigned int logical_block_size = sdkp->device->sector_size;
743 unsigned int blocks = 0;
745 if (sdkp->device->no_write_same) {
746 sdkp->max_ws_blocks = 0;
750 /* Some devices can not handle block counts above 0xffff despite
751 * supporting WRITE SAME(16). Consequently we default to 64k
752 * blocks per I/O unless the device explicitly advertises a
755 if (sdkp->max_ws_blocks == 0)
756 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
758 if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
759 blocks = min_not_zero(sdkp->max_ws_blocks,
760 (u32)SD_MAX_WS16_BLOCKS);
762 blocks = min_not_zero(sdkp->max_ws_blocks,
763 (u32)SD_MAX_WS10_BLOCKS);
766 blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
770 * sd_setup_write_same_cmnd - write the same data to multiple blocks
771 * @sdp: scsi device to operate one
772 * @rq: Request to prepare
774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
775 * preference indicated by target device.
777 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
779 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
780 struct bio *bio = rq->bio;
781 sector_t sector = blk_rq_pos(rq);
782 unsigned int nr_sectors = blk_rq_sectors(rq);
783 unsigned int nr_bytes = blk_rq_bytes(rq);
786 if (sdkp->device->no_write_same)
789 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
791 sector >>= ilog2(sdp->sector_size) - 9;
792 nr_sectors >>= ilog2(sdp->sector_size) - 9;
794 rq->__data_len = sdp->sector_size;
795 rq->timeout = SD_WRITE_SAME_TIMEOUT;
796 memset(rq->cmd, 0, rq->cmd_len);
798 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
800 rq->cmd[0] = WRITE_SAME_16;
801 put_unaligned_be64(sector, &rq->cmd[2]);
802 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
805 rq->cmd[0] = WRITE_SAME;
806 put_unaligned_be32(sector, &rq->cmd[2]);
807 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
810 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
811 rq->__data_len = nr_bytes;
816 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
818 rq->timeout = SD_FLUSH_TIMEOUT;
819 rq->retries = SD_MAX_RETRIES;
820 rq->cmd[0] = SYNCHRONIZE_CACHE;
823 return scsi_setup_blk_pc_cmnd(sdp, rq);
826 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
828 if (rq->cmd_flags & REQ_DISCARD) {
829 free_page((unsigned long)rq->buffer);
835 * sd_prep_fn - build a scsi (read or write) command from
836 * information in the request structure.
837 * @SCpnt: pointer to mid-level's per scsi command structure that
838 * contains request and into which the scsi command is written
840 * Returns 1 if successful and 0 if error (or cannot be done now).
842 static int sd_prep_fn(struct request_queue *q, struct request *rq)
844 struct scsi_cmnd *SCpnt;
845 struct scsi_device *sdp = q->queuedata;
846 struct gendisk *disk = rq->rq_disk;
847 struct scsi_disk *sdkp;
848 sector_t block = blk_rq_pos(rq);
850 unsigned int this_count = blk_rq_sectors(rq);
852 unsigned char protect;
855 * Discard request come in as REQ_TYPE_FS but we turn them into
856 * block PC requests to make life easier.
858 if (rq->cmd_flags & REQ_DISCARD) {
859 ret = sd_setup_discard_cmnd(sdp, rq);
861 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
862 ret = sd_setup_write_same_cmnd(sdp, rq);
864 } else if (rq->cmd_flags & REQ_FLUSH) {
865 ret = scsi_setup_flush_cmnd(sdp, rq);
867 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
868 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
870 } else if (rq->cmd_type != REQ_TYPE_FS) {
874 ret = scsi_setup_fs_cmnd(sdp, rq);
875 if (ret != BLKPREP_OK)
878 sdkp = scsi_disk(disk);
880 /* from here on until we're complete, any goto out
881 * is used for a killable error condition */
884 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
885 "sd_prep_fn: block=%llu, "
887 (unsigned long long)block,
890 if (!sdp || !scsi_device_online(sdp) ||
891 block + blk_rq_sectors(rq) > get_capacity(disk)) {
892 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
893 "Finishing %u sectors\n",
894 blk_rq_sectors(rq)));
895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
896 "Retry with 0x%p\n", SCpnt));
902 * quietly refuse to do anything to a changed disc until
903 * the changed bit has been reset
905 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
910 * Some SD card readers can't handle multi-sector accesses which touch
911 * the last one or two hardware sectors. Split accesses as needed.
913 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
914 (sdp->sector_size / 512);
916 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
917 if (block < threshold) {
918 /* Access up to the threshold but not beyond */
919 this_count = threshold - block;
921 /* Access only a single hardware sector */
922 this_count = sdp->sector_size / 512;
926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
927 (unsigned long long)block));
930 * If we have a 1K hardware sectorsize, prevent access to single
931 * 512 byte sectors. In theory we could handle this - in fact
932 * the scsi cdrom driver must be able to handle this because
933 * we typically use 1K blocksizes, and cdroms typically have
934 * 2K hardware sectorsizes. Of course, things are simpler
935 * with the cdrom, since it is read-only. For performance
936 * reasons, the filesystems should be able to handle this
937 * and not force the scsi disk driver to use bounce buffers
940 if (sdp->sector_size == 1024) {
941 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
942 scmd_printk(KERN_ERR, SCpnt,
943 "Bad block number requested\n");
947 this_count = this_count >> 1;
950 if (sdp->sector_size == 2048) {
951 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
957 this_count = this_count >> 2;
960 if (sdp->sector_size == 4096) {
961 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
967 this_count = this_count >> 3;
970 if (rq_data_dir(rq) == WRITE) {
971 if (!sdp->writeable) {
974 SCpnt->cmnd[0] = WRITE_6;
975 SCpnt->sc_data_direction = DMA_TO_DEVICE;
977 if (blk_integrity_rq(rq))
978 sd_dif_prepare(rq, block, sdp->sector_size);
980 } else if (rq_data_dir(rq) == READ) {
981 SCpnt->cmnd[0] = READ_6;
982 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
984 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
988 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
989 "%s %d/%u 512 byte blocks.\n",
990 (rq_data_dir(rq) == WRITE) ?
991 "writing" : "reading", this_count,
992 blk_rq_sectors(rq)));
994 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
995 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1001 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1002 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1004 if (unlikely(SCpnt->cmnd == NULL)) {
1005 ret = BLKPREP_DEFER;
1009 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1010 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1011 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1012 SCpnt->cmnd[7] = 0x18;
1013 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1014 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1017 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1022 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1023 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1024 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1026 /* Expected Indirect LBA */
1027 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1028 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1029 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1030 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1032 /* Transfer length */
1033 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1034 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1035 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1036 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1037 } else if (sdp->use_16_for_rw) {
1038 SCpnt->cmnd[0] += READ_16 - READ_6;
1039 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1040 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1041 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1042 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1043 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1044 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1045 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1046 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1047 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1048 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1049 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1050 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1051 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1052 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1053 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1054 scsi_device_protection(SCpnt->device) ||
1055 SCpnt->device->use_10_for_rw) {
1056 if (this_count > 0xffff)
1057 this_count = 0xffff;
1059 SCpnt->cmnd[0] += READ_10 - READ_6;
1060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1061 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1062 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1063 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1064 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1065 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1066 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1067 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1069 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1071 * This happens only if this drive failed
1072 * 10byte rw command with ILLEGAL_REQUEST
1073 * during operation and thus turned off
1076 scmd_printk(KERN_ERR, SCpnt,
1077 "FUA write on READ/WRITE(6) drive\n");
1081 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1082 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1083 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1084 SCpnt->cmnd[4] = (unsigned char) this_count;
1087 SCpnt->sdb.length = this_count * sdp->sector_size;
1089 /* If DIF or DIX is enabled, tell HBA how to handle request */
1090 if (host_dif || scsi_prot_sg_count(SCpnt))
1091 sd_prot_op(SCpnt, host_dif);
1094 * We shouldn't disconnect in the middle of a sector, so with a dumb
1095 * host adapter, it's safe to assume that we can at least transfer
1096 * this many bytes between each connect / disconnect.
1098 SCpnt->transfersize = sdp->sector_size;
1099 SCpnt->underflow = this_count << 9;
1100 SCpnt->allowed = SD_MAX_RETRIES;
1103 * This indicates that the command is ready from our end to be
1108 return scsi_prep_return(q, rq, ret);
1112 * sd_open - open a scsi disk device
1113 * @inode: only i_rdev member may be used
1114 * @filp: only f_mode and f_flags may be used
1116 * Returns 0 if successful. Returns a negated errno value in case
1119 * Note: This can be called from a user context (e.g. fsck(1) )
1120 * or from within the kernel (e.g. as a result of a mount(1) ).
1121 * In the latter case @inode and @filp carry an abridged amount
1122 * of information as noted above.
1124 * Locking: called with bdev->bd_mutex held.
1126 static int sd_open(struct block_device *bdev, fmode_t mode)
1128 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1129 struct scsi_device *sdev;
1135 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1137 sdev = sdkp->device;
1140 * If the device is in error recovery, wait until it is done.
1141 * If the device is offline, then disallow any access to it.
1144 if (!scsi_block_when_processing_errors(sdev))
1147 if (sdev->removable || sdkp->write_prot)
1148 check_disk_change(bdev);
1151 * If the drive is empty, just let the open fail.
1153 retval = -ENOMEDIUM;
1154 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1158 * If the device has the write protect tab set, have the open fail
1159 * if the user expects to be able to write to the thing.
1162 if (sdkp->write_prot && (mode & FMODE_WRITE))
1166 * It is possible that the disk changing stuff resulted in
1167 * the device being taken offline. If this is the case,
1168 * report this to the user, and don't pretend that the
1169 * open actually succeeded.
1172 if (!scsi_device_online(sdev))
1175 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1176 if (scsi_block_when_processing_errors(sdev))
1177 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1183 scsi_disk_put(sdkp);
1188 * sd_release - invoked when the (last) close(2) is called on this
1190 * @inode: only i_rdev member may be used
1191 * @filp: only f_mode and f_flags may be used
1195 * Note: may block (uninterruptible) if error recovery is underway
1198 * Locking: called with bdev->bd_mutex held.
1200 static void sd_release(struct gendisk *disk, fmode_t mode)
1202 struct scsi_disk *sdkp = scsi_disk(disk);
1203 struct scsi_device *sdev = sdkp->device;
1205 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1207 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1208 if (scsi_block_when_processing_errors(sdev))
1209 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1213 * XXX and what if there are packets in flight and this close()
1214 * XXX is followed by a "rmmod sd_mod"?
1217 scsi_disk_put(sdkp);
1220 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1222 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1223 struct scsi_device *sdp = sdkp->device;
1224 struct Scsi_Host *host = sdp->host;
1227 /* default to most commonly used values */
1228 diskinfo[0] = 0x40; /* 1 << 6 */
1229 diskinfo[1] = 0x20; /* 1 << 5 */
1230 diskinfo[2] = sdkp->capacity >> 11;
1232 /* override with calculated, extended default, or driver values */
1233 if (host->hostt->bios_param)
1234 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1236 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1238 geo->heads = diskinfo[0];
1239 geo->sectors = diskinfo[1];
1240 geo->cylinders = diskinfo[2];
1245 * sd_ioctl - process an ioctl
1246 * @inode: only i_rdev/i_bdev members may be used
1247 * @filp: only f_mode and f_flags may be used
1248 * @cmd: ioctl command number
1249 * @arg: this is third argument given to ioctl(2) system call.
1250 * Often contains a pointer.
1252 * Returns 0 if successful (some ioctls return positive numbers on
1253 * success as well). Returns a negated errno value in case of error.
1255 * Note: most ioctls are forward onto the block subsystem or further
1256 * down in the scsi subsystem.
1258 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1259 unsigned int cmd, unsigned long arg)
1261 struct gendisk *disk = bdev->bd_disk;
1262 struct scsi_disk *sdkp = scsi_disk(disk);
1263 struct scsi_device *sdp = sdkp->device;
1264 void __user *p = (void __user *)arg;
1267 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1268 "cmd=0x%x\n", disk->disk_name, cmd));
1270 error = scsi_verify_blk_ioctl(bdev, cmd);
1275 * If we are in the middle of error recovery, don't let anyone
1276 * else try and use this device. Also, if error recovery fails, it
1277 * may try and take the device offline, in which case all further
1278 * access to the device is prohibited.
1280 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1281 (mode & FMODE_NDELAY) != 0);
1282 if (!scsi_block_when_processing_errors(sdp) || !error)
1286 * Send SCSI addressing ioctls directly to mid level, send other
1287 * ioctls to block level and then onto mid level if they can't be
1291 case SCSI_IOCTL_GET_IDLUN:
1292 case SCSI_IOCTL_GET_BUS_NUMBER:
1293 error = scsi_ioctl(sdp, cmd, p);
1296 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1297 if (error != -ENOTTY)
1299 error = scsi_ioctl(sdp, cmd, p);
1306 static void set_media_not_present(struct scsi_disk *sdkp)
1308 if (sdkp->media_present)
1309 sdkp->device->changed = 1;
1311 if (sdkp->device->removable) {
1312 sdkp->media_present = 0;
1317 static int media_not_present(struct scsi_disk *sdkp,
1318 struct scsi_sense_hdr *sshdr)
1320 if (!scsi_sense_valid(sshdr))
1323 /* not invoked for commands that could return deferred errors */
1324 switch (sshdr->sense_key) {
1325 case UNIT_ATTENTION:
1327 /* medium not present */
1328 if (sshdr->asc == 0x3A) {
1329 set_media_not_present(sdkp);
1337 * sd_check_events - check media events
1338 * @disk: kernel device descriptor
1339 * @clearing: disk events currently being cleared
1341 * Returns mask of DISK_EVENT_*.
1343 * Note: this function is invoked from the block subsystem.
1345 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1347 struct scsi_disk *sdkp = scsi_disk(disk);
1348 struct scsi_device *sdp = sdkp->device;
1349 struct scsi_sense_hdr *sshdr = NULL;
1352 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1355 * If the device is offline, don't send any commands - just pretend as
1356 * if the command failed. If the device ever comes back online, we
1357 * can deal with it then. It is only because of unrecoverable errors
1358 * that we would ever take a device offline in the first place.
1360 if (!scsi_device_online(sdp)) {
1361 set_media_not_present(sdkp);
1366 * Using TEST_UNIT_READY enables differentiation between drive with
1367 * no cartridge loaded - NOT READY, drive with changed cartridge -
1368 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1370 * Drives that auto spin down. eg iomega jaz 1G, will be started
1371 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1372 * sd_revalidate() is called.
1376 if (scsi_block_when_processing_errors(sdp)) {
1377 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1378 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1382 /* failed to execute TUR, assume media not present */
1383 if (host_byte(retval)) {
1384 set_media_not_present(sdkp);
1388 if (media_not_present(sdkp, sshdr))
1392 * For removable scsi disk we have to recognise the presence
1393 * of a disk in the drive.
1395 if (!sdkp->media_present)
1397 sdkp->media_present = 1;
1400 * sdp->changed is set under the following conditions:
1402 * Medium present state has changed in either direction.
1403 * Device has indicated UNIT_ATTENTION.
1406 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1411 static int sd_sync_cache(struct scsi_disk *sdkp)
1414 struct scsi_device *sdp = sdkp->device;
1415 struct scsi_sense_hdr sshdr;
1417 if (!scsi_device_online(sdp))
1421 for (retries = 3; retries > 0; --retries) {
1422 unsigned char cmd[10] = { 0 };
1424 cmd[0] = SYNCHRONIZE_CACHE;
1426 * Leave the rest of the command zero to indicate
1429 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1430 &sshdr, SD_FLUSH_TIMEOUT,
1431 SD_MAX_RETRIES, NULL, REQ_PM);
1437 sd_print_result(sdkp, res);
1438 if (driver_byte(res) & DRIVER_SENSE)
1439 sd_print_sense_hdr(sdkp, &sshdr);
1447 static void sd_rescan(struct device *dev)
1449 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1452 revalidate_disk(sdkp->disk);
1453 scsi_disk_put(sdkp);
1458 #ifdef CONFIG_COMPAT
1460 * This gets directly called from VFS. When the ioctl
1461 * is not recognized we go back to the other translation paths.
1463 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1464 unsigned int cmd, unsigned long arg)
1466 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1469 ret = scsi_verify_blk_ioctl(bdev, cmd);
1474 * If we are in the middle of error recovery, don't let anyone
1475 * else try and use this device. Also, if error recovery fails, it
1476 * may try and take the device offline, in which case all further
1477 * access to the device is prohibited.
1479 if (!scsi_block_when_processing_errors(sdev))
1482 if (sdev->host->hostt->compat_ioctl) {
1483 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1489 * Let the static ioctl translation table take care of it.
1491 return -ENOIOCTLCMD;
1495 static const struct block_device_operations sd_fops = {
1496 .owner = THIS_MODULE,
1498 .release = sd_release,
1500 .getgeo = sd_getgeo,
1501 #ifdef CONFIG_COMPAT
1502 .compat_ioctl = sd_compat_ioctl,
1504 .check_events = sd_check_events,
1505 .revalidate_disk = sd_revalidate_disk,
1506 .unlock_native_capacity = sd_unlock_native_capacity,
1510 * sd_eh_action - error handling callback
1511 * @scmd: sd-issued command that has failed
1512 * @eh_cmnd: The command that was sent during error handling
1513 * @eh_cmnd_len: Length of eh_cmnd in bytes
1514 * @eh_disp: The recovery disposition suggested by the midlayer
1516 * This function is called by the SCSI midlayer upon completion of
1517 * an error handling command (TEST UNIT READY, START STOP UNIT,
1518 * etc.) The command sent to the device by the error handler is
1519 * stored in eh_cmnd. The result of sending the eh command is
1520 * passed in eh_disp.
1522 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1523 int eh_cmnd_len, int eh_disp)
1525 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1527 if (!scsi_device_online(scmd->device) ||
1528 !scsi_medium_access_command(scmd))
1532 * The device has timed out executing a medium access command.
1533 * However, the TEST UNIT READY command sent during error
1534 * handling completed successfully. Either the device is in the
1535 * process of recovering or has it suffered an internal failure
1536 * that prevents access to the storage medium.
1538 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1539 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1540 sdkp->medium_access_timed_out++;
1543 * If the device keeps failing read/write commands but TEST UNIT
1544 * READY always completes successfully we assume that medium
1545 * access is no longer possible and take the device offline.
1547 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1548 scmd_printk(KERN_ERR, scmd,
1549 "Medium access timeout failure. Offlining disk!\n");
1550 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1558 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1560 u64 start_lba = blk_rq_pos(scmd->request);
1561 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1565 * resid is optional but mostly filled in. When it's unused,
1566 * its value is zero, so we assume the whole buffer transferred
1568 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1569 unsigned int good_bytes;
1571 if (scmd->request->cmd_type != REQ_TYPE_FS)
1574 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1575 SCSI_SENSE_BUFFERSIZE,
1580 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1583 if (scmd->device->sector_size < 512) {
1584 /* only legitimate sector_size here is 256 */
1588 /* be careful ... don't want any overflows */
1589 u64 factor = scmd->device->sector_size / 512;
1590 do_div(start_lba, factor);
1591 do_div(end_lba, factor);
1594 /* The bad lba was reported incorrectly, we have no idea where
1597 if (bad_lba < start_lba || bad_lba >= end_lba)
1600 /* This computation should always be done in terms of
1601 * the resolution of the device's medium.
1603 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1604 return min(good_bytes, transferred);
1608 * sd_done - bottom half handler: called when the lower level
1609 * driver has completed (successfully or otherwise) a scsi command.
1610 * @SCpnt: mid-level's per command structure.
1612 * Note: potentially run from within an ISR. Must not block.
1614 static int sd_done(struct scsi_cmnd *SCpnt)
1616 int result = SCpnt->result;
1617 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1618 struct scsi_sense_hdr sshdr;
1619 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1620 struct request *req = SCpnt->request;
1621 int sense_valid = 0;
1622 int sense_deferred = 0;
1623 unsigned char op = SCpnt->cmnd[0];
1624 unsigned char unmap = SCpnt->cmnd[1] & 8;
1626 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1628 good_bytes = blk_rq_bytes(req);
1629 scsi_set_resid(SCpnt, 0);
1632 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1637 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1639 sense_deferred = scsi_sense_is_deferred(&sshdr);
1641 #ifdef CONFIG_SCSI_LOGGING
1642 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1644 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1645 "sd_done: sb[respc,sk,asc,"
1646 "ascq]=%x,%x,%x,%x\n",
1647 sshdr.response_code,
1648 sshdr.sense_key, sshdr.asc,
1652 if (driver_byte(result) != DRIVER_SENSE &&
1653 (!sense_valid || sense_deferred))
1656 sdkp->medium_access_timed_out = 0;
1658 switch (sshdr.sense_key) {
1659 case HARDWARE_ERROR:
1661 good_bytes = sd_completed_bytes(SCpnt);
1663 case RECOVERED_ERROR:
1664 good_bytes = scsi_bufflen(SCpnt);
1667 /* This indicates a false check condition, so ignore it. An
1668 * unknown amount of data was transferred so treat it as an
1671 scsi_print_sense("sd", SCpnt);
1673 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1675 case ABORTED_COMMAND:
1676 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1677 good_bytes = sd_completed_bytes(SCpnt);
1679 case ILLEGAL_REQUEST:
1680 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1681 good_bytes = sd_completed_bytes(SCpnt);
1682 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1683 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1686 sd_config_discard(sdkp, SD_LBP_DISABLE);
1691 sd_config_discard(sdkp, SD_LBP_DISABLE);
1693 sdkp->device->no_write_same = 1;
1694 sd_config_write_same(sdkp);
1697 req->__data_len = blk_rq_bytes(req);
1698 req->cmd_flags |= REQ_QUIET;
1707 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1708 sd_dif_complete(SCpnt, good_bytes);
1710 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1711 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1713 /* We have to print a failed command here as the
1714 * extended CDB gets freed before scsi_io_completion()
1718 scsi_print_command(SCpnt);
1720 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1729 * spinup disk - called only in sd_revalidate_disk()
1732 sd_spinup_disk(struct scsi_disk *sdkp)
1734 unsigned char cmd[10];
1735 unsigned long spintime_expire = 0;
1736 int retries, spintime;
1737 unsigned int the_result;
1738 struct scsi_sense_hdr sshdr;
1739 int sense_valid = 0;
1743 /* Spin up drives, as required. Only do this at boot time */
1744 /* Spinup needs to be done for module loads too. */
1749 cmd[0] = TEST_UNIT_READY;
1750 memset((void *) &cmd[1], 0, 9);
1752 the_result = scsi_execute_req(sdkp->device, cmd,
1755 SD_MAX_RETRIES, NULL);
1758 * If the drive has indicated to us that it
1759 * doesn't have any media in it, don't bother
1760 * with any more polling.
1762 if (media_not_present(sdkp, &sshdr))
1766 sense_valid = scsi_sense_valid(&sshdr);
1768 } while (retries < 3 &&
1769 (!scsi_status_is_good(the_result) ||
1770 ((driver_byte(the_result) & DRIVER_SENSE) &&
1771 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1773 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1774 /* no sense, TUR either succeeded or failed
1775 * with a status error */
1776 if(!spintime && !scsi_status_is_good(the_result)) {
1777 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1778 sd_print_result(sdkp, the_result);
1784 * The device does not want the automatic start to be issued.
1786 if (sdkp->device->no_start_on_add)
1789 if (sense_valid && sshdr.sense_key == NOT_READY) {
1790 if (sshdr.asc == 4 && sshdr.ascq == 3)
1791 break; /* manual intervention required */
1792 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1793 break; /* standby */
1794 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1795 break; /* unavailable */
1797 * Issue command to spin up drive when not ready
1800 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1801 cmd[0] = START_STOP;
1802 cmd[1] = 1; /* Return immediately */
1803 memset((void *) &cmd[2], 0, 8);
1804 cmd[4] = 1; /* Start spin cycle */
1805 if (sdkp->device->start_stop_pwr_cond)
1807 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1809 SD_TIMEOUT, SD_MAX_RETRIES,
1811 spintime_expire = jiffies + 100 * HZ;
1814 /* Wait 1 second for next try */
1819 * Wait for USB flash devices with slow firmware.
1820 * Yes, this sense key/ASC combination shouldn't
1821 * occur here. It's characteristic of these devices.
1823 } else if (sense_valid &&
1824 sshdr.sense_key == UNIT_ATTENTION &&
1825 sshdr.asc == 0x28) {
1827 spintime_expire = jiffies + 5 * HZ;
1830 /* Wait 1 second for next try */
1833 /* we don't understand the sense code, so it's
1834 * probably pointless to loop */
1836 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1837 sd_print_sense_hdr(sdkp, &sshdr);
1842 } while (spintime && time_before_eq(jiffies, spintime_expire));
1845 if (scsi_status_is_good(the_result))
1848 printk("not responding...\n");
1854 * Determine whether disk supports Data Integrity Field.
1856 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1858 struct scsi_device *sdp = sdkp->device;
1862 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1865 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1867 if (type > SD_DIF_TYPE3_PROTECTION)
1869 else if (scsi_host_dif_capable(sdp->host, type))
1872 if (sdkp->first_scan || type != sdkp->protection_type)
1875 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1876 " protection type %u. Disabling disk!\n",
1880 sd_printk(KERN_NOTICE, sdkp,
1881 "Enabling DIF Type %u protection\n", type);
1884 sd_printk(KERN_NOTICE, sdkp,
1885 "Disabling DIF Type %u protection\n", type);
1889 sdkp->protection_type = type;
1894 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1895 struct scsi_sense_hdr *sshdr, int sense_valid,
1898 sd_print_result(sdkp, the_result);
1899 if (driver_byte(the_result) & DRIVER_SENSE)
1900 sd_print_sense_hdr(sdkp, sshdr);
1902 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1905 * Set dirty bit for removable devices if not ready -
1906 * sometimes drives will not report this properly.
1908 if (sdp->removable &&
1909 sense_valid && sshdr->sense_key == NOT_READY)
1910 set_media_not_present(sdkp);
1913 * We used to set media_present to 0 here to indicate no media
1914 * in the drive, but some drives fail read capacity even with
1915 * media present, so we can't do that.
1917 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1921 #if RC16_LEN > SD_BUF_SIZE
1922 #error RC16_LEN must not be more than SD_BUF_SIZE
1925 #define READ_CAPACITY_RETRIES_ON_RESET 10
1927 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1928 unsigned char *buffer)
1930 unsigned char cmd[16];
1931 struct scsi_sense_hdr sshdr;
1932 int sense_valid = 0;
1934 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1935 unsigned int alignment;
1936 unsigned long long lba;
1937 unsigned sector_size;
1939 if (sdp->no_read_capacity_16)
1944 cmd[0] = SERVICE_ACTION_IN;
1945 cmd[1] = SAI_READ_CAPACITY_16;
1947 memset(buffer, 0, RC16_LEN);
1949 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1950 buffer, RC16_LEN, &sshdr,
1951 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1953 if (media_not_present(sdkp, &sshdr))
1957 sense_valid = scsi_sense_valid(&sshdr);
1959 sshdr.sense_key == ILLEGAL_REQUEST &&
1960 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1962 /* Invalid Command Operation Code or
1963 * Invalid Field in CDB, just retry
1964 * silently with RC10 */
1967 sshdr.sense_key == UNIT_ATTENTION &&
1968 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1969 /* Device reset might occur several times,
1970 * give it one more chance */
1971 if (--reset_retries > 0)
1976 } while (the_result && retries);
1979 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1980 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1984 sector_size = get_unaligned_be32(&buffer[8]);
1985 lba = get_unaligned_be64(&buffer[0]);
1987 if (sd_read_protection_type(sdkp, buffer) < 0) {
1992 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1993 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1994 "kernel compiled with support for large block "
2000 /* Logical blocks per physical block exponent */
2001 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2003 /* Lowest aligned logical block */
2004 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2005 blk_queue_alignment_offset(sdp->request_queue, alignment);
2006 if (alignment && sdkp->first_scan)
2007 sd_printk(KERN_NOTICE, sdkp,
2008 "physical block alignment offset: %u\n", alignment);
2010 if (buffer[14] & 0x80) { /* LBPME */
2013 if (buffer[14] & 0x40) /* LBPRZ */
2016 sd_config_discard(sdkp, SD_LBP_WS16);
2019 sdkp->capacity = lba + 1;
2023 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2024 unsigned char *buffer)
2026 unsigned char cmd[16];
2027 struct scsi_sense_hdr sshdr;
2028 int sense_valid = 0;
2030 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2032 unsigned sector_size;
2035 cmd[0] = READ_CAPACITY;
2036 memset(&cmd[1], 0, 9);
2037 memset(buffer, 0, 8);
2039 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2041 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2043 if (media_not_present(sdkp, &sshdr))
2047 sense_valid = scsi_sense_valid(&sshdr);
2049 sshdr.sense_key == UNIT_ATTENTION &&
2050 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2051 /* Device reset might occur several times,
2052 * give it one more chance */
2053 if (--reset_retries > 0)
2058 } while (the_result && retries);
2061 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2062 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2066 sector_size = get_unaligned_be32(&buffer[4]);
2067 lba = get_unaligned_be32(&buffer[0]);
2069 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2070 /* Some buggy (usb cardreader) devices return an lba of
2071 0xffffffff when the want to report a size of 0 (with
2072 which they really mean no media is present) */
2074 sdkp->physical_block_size = sector_size;
2078 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2079 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2080 "kernel compiled with support for large block "
2086 sdkp->capacity = lba + 1;
2087 sdkp->physical_block_size = sector_size;
2091 static int sd_try_rc16_first(struct scsi_device *sdp)
2093 if (sdp->host->max_cmd_len < 16)
2095 if (sdp->try_rc_10_first)
2097 if (sdp->scsi_level > SCSI_SPC_2)
2099 if (scsi_device_protection(sdp))
2105 * read disk capacity
2108 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2111 struct scsi_device *sdp = sdkp->device;
2112 sector_t old_capacity = sdkp->capacity;
2114 if (sd_try_rc16_first(sdp)) {
2115 sector_size = read_capacity_16(sdkp, sdp, buffer);
2116 if (sector_size == -EOVERFLOW)
2118 if (sector_size == -ENODEV)
2120 if (sector_size < 0)
2121 sector_size = read_capacity_10(sdkp, sdp, buffer);
2122 if (sector_size < 0)
2125 sector_size = read_capacity_10(sdkp, sdp, buffer);
2126 if (sector_size == -EOVERFLOW)
2128 if (sector_size < 0)
2130 if ((sizeof(sdkp->capacity) > 4) &&
2131 (sdkp->capacity > 0xffffffffULL)) {
2132 int old_sector_size = sector_size;
2133 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2134 "Trying to use READ CAPACITY(16).\n");
2135 sector_size = read_capacity_16(sdkp, sdp, buffer);
2136 if (sector_size < 0) {
2137 sd_printk(KERN_NOTICE, sdkp,
2138 "Using 0xffffffff as device size\n");
2139 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2140 sector_size = old_sector_size;
2146 /* Some devices are known to return the total number of blocks,
2147 * not the highest block number. Some devices have versions
2148 * which do this and others which do not. Some devices we might
2149 * suspect of doing this but we don't know for certain.
2151 * If we know the reported capacity is wrong, decrement it. If
2152 * we can only guess, then assume the number of blocks is even
2153 * (usually true but not always) and err on the side of lowering
2156 if (sdp->fix_capacity ||
2157 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2158 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2159 "from its reported value: %llu\n",
2160 (unsigned long long) sdkp->capacity);
2165 if (sector_size == 0) {
2167 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2171 if (sector_size != 512 &&
2172 sector_size != 1024 &&
2173 sector_size != 2048 &&
2174 sector_size != 4096 &&
2175 sector_size != 256) {
2176 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2179 * The user might want to re-format the drive with
2180 * a supported sectorsize. Once this happens, it
2181 * would be relatively trivial to set the thing up.
2182 * For this reason, we leave the thing in the table.
2186 * set a bogus sector size so the normal read/write
2187 * logic in the block layer will eventually refuse any
2188 * request on this device without tripping over power
2189 * of two sector size assumptions
2193 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2196 char cap_str_2[10], cap_str_10[10];
2197 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2199 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2201 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2202 sizeof(cap_str_10));
2204 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2205 sd_printk(KERN_NOTICE, sdkp,
2206 "%llu %d-byte logical blocks: (%s/%s)\n",
2207 (unsigned long long)sdkp->capacity,
2208 sector_size, cap_str_10, cap_str_2);
2210 if (sdkp->physical_block_size != sector_size)
2211 sd_printk(KERN_NOTICE, sdkp,
2212 "%u-byte physical blocks\n",
2213 sdkp->physical_block_size);
2217 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2219 /* Rescale capacity to 512-byte units */
2220 if (sector_size == 4096)
2221 sdkp->capacity <<= 3;
2222 else if (sector_size == 2048)
2223 sdkp->capacity <<= 2;
2224 else if (sector_size == 1024)
2225 sdkp->capacity <<= 1;
2226 else if (sector_size == 256)
2227 sdkp->capacity >>= 1;
2229 blk_queue_physical_block_size(sdp->request_queue,
2230 sdkp->physical_block_size);
2231 sdkp->device->sector_size = sector_size;
2234 /* called with buffer of length 512 */
2236 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2237 unsigned char *buffer, int len, struct scsi_mode_data *data,
2238 struct scsi_sense_hdr *sshdr)
2240 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2241 SD_TIMEOUT, SD_MAX_RETRIES, data,
2246 * read write protect setting, if possible - called only in sd_revalidate_disk()
2247 * called with buffer of length SD_BUF_SIZE
2250 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2253 struct scsi_device *sdp = sdkp->device;
2254 struct scsi_mode_data data;
2255 int old_wp = sdkp->write_prot;
2257 set_disk_ro(sdkp->disk, 0);
2258 if (sdp->skip_ms_page_3f) {
2259 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2263 if (sdp->use_192_bytes_for_3f) {
2264 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2267 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2268 * We have to start carefully: some devices hang if we ask
2269 * for more than is available.
2271 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2274 * Second attempt: ask for page 0 When only page 0 is
2275 * implemented, a request for page 3F may return Sense Key
2276 * 5: Illegal Request, Sense Code 24: Invalid field in
2279 if (!scsi_status_is_good(res))
2280 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2283 * Third attempt: ask 255 bytes, as we did earlier.
2285 if (!scsi_status_is_good(res))
2286 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2290 if (!scsi_status_is_good(res)) {
2291 sd_printk(KERN_WARNING, sdkp,
2292 "Test WP failed, assume Write Enabled\n");
2294 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2295 set_disk_ro(sdkp->disk, sdkp->write_prot);
2296 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2297 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2298 sdkp->write_prot ? "on" : "off");
2299 sd_printk(KERN_DEBUG, sdkp,
2300 "Mode Sense: %02x %02x %02x %02x\n",
2301 buffer[0], buffer[1], buffer[2], buffer[3]);
2307 * sd_read_cache_type - called only from sd_revalidate_disk()
2308 * called with buffer of length SD_BUF_SIZE
2311 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2314 struct scsi_device *sdp = sdkp->device;
2319 struct scsi_mode_data data;
2320 struct scsi_sense_hdr sshdr;
2321 int old_wce = sdkp->WCE;
2322 int old_rcd = sdkp->RCD;
2323 int old_dpofua = sdkp->DPOFUA;
2326 if (sdkp->cache_override)
2330 if (sdp->skip_ms_page_8) {
2331 if (sdp->type == TYPE_RBC)
2334 if (sdp->skip_ms_page_3f)
2337 if (sdp->use_192_bytes_for_3f)
2341 } else if (sdp->type == TYPE_RBC) {
2349 /* cautiously ask */
2350 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2353 if (!scsi_status_is_good(res))
2356 if (!data.header_length) {
2359 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2362 /* that went OK, now ask for the proper length */
2366 * We're only interested in the first three bytes, actually.
2367 * But the data cache page is defined for the first 20.
2371 else if (len > SD_BUF_SIZE) {
2372 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2373 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2376 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2380 if (len > first_len)
2381 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2384 if (scsi_status_is_good(res)) {
2385 int offset = data.header_length + data.block_descriptor_length;
2387 while (offset < len) {
2388 u8 page_code = buffer[offset] & 0x3F;
2389 u8 spf = buffer[offset] & 0x40;
2391 if (page_code == 8 || page_code == 6) {
2392 /* We're interested only in the first 3 bytes.
2394 if (len - offset <= 2) {
2395 sd_printk(KERN_ERR, sdkp, "Incomplete "
2396 "mode parameter data\n");
2399 modepage = page_code;
2403 /* Go to the next page */
2404 if (spf && len - offset > 3)
2405 offset += 4 + (buffer[offset+2] << 8) +
2407 else if (!spf && len - offset > 1)
2408 offset += 2 + buffer[offset+1];
2410 sd_printk(KERN_ERR, sdkp, "Incomplete "
2411 "mode parameter data\n");
2417 if (modepage == 0x3F) {
2418 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2421 } else if ((buffer[offset] & 0x3f) != modepage) {
2422 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2426 if (modepage == 8) {
2427 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2428 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2430 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2434 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2435 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2436 sd_printk(KERN_NOTICE, sdkp,
2437 "Uses READ/WRITE(6), disabling FUA\n");
2441 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2442 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2443 sd_printk(KERN_NOTICE, sdkp,
2444 "Write cache: %s, read cache: %s, %s\n",
2445 sdkp->WCE ? "enabled" : "disabled",
2446 sdkp->RCD ? "disabled" : "enabled",
2447 sdkp->DPOFUA ? "supports DPO and FUA"
2448 : "doesn't support DPO or FUA");
2454 if (scsi_sense_valid(&sshdr) &&
2455 sshdr.sense_key == ILLEGAL_REQUEST &&
2456 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2457 /* Invalid field in CDB */
2458 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2460 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2463 if (sdp->wce_default_on) {
2464 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2467 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2475 * The ATO bit indicates whether the DIF application tag is available
2476 * for use by the operating system.
2478 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2481 struct scsi_device *sdp = sdkp->device;
2482 struct scsi_mode_data data;
2483 struct scsi_sense_hdr sshdr;
2485 if (sdp->type != TYPE_DISK)
2488 if (sdkp->protection_type == 0)
2491 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2492 SD_MAX_RETRIES, &data, &sshdr);
2494 if (!scsi_status_is_good(res) || !data.header_length ||
2496 sd_printk(KERN_WARNING, sdkp,
2497 "getting Control mode page failed, assume no ATO\n");
2499 if (scsi_sense_valid(&sshdr))
2500 sd_print_sense_hdr(sdkp, &sshdr);
2505 offset = data.header_length + data.block_descriptor_length;
2507 if ((buffer[offset] & 0x3f) != 0x0a) {
2508 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2512 if ((buffer[offset + 5] & 0x80) == 0)
2521 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2522 * @disk: disk to query
2524 static void sd_read_block_limits(struct scsi_disk *sdkp)
2526 unsigned int sector_sz = sdkp->device->sector_size;
2527 const int vpd_len = 64;
2528 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2531 /* Block Limits VPD */
2532 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2535 blk_queue_io_min(sdkp->disk->queue,
2536 get_unaligned_be16(&buffer[6]) * sector_sz);
2537 blk_queue_io_opt(sdkp->disk->queue,
2538 get_unaligned_be32(&buffer[12]) * sector_sz);
2540 if (buffer[3] == 0x3c) {
2541 unsigned int lba_count, desc_count;
2543 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2548 lba_count = get_unaligned_be32(&buffer[20]);
2549 desc_count = get_unaligned_be32(&buffer[24]);
2551 if (lba_count && desc_count)
2552 sdkp->max_unmap_blocks = lba_count;
2554 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2556 if (buffer[32] & 0x80)
2557 sdkp->unmap_alignment =
2558 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2560 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2562 if (sdkp->max_unmap_blocks)
2563 sd_config_discard(sdkp, SD_LBP_UNMAP);
2565 sd_config_discard(sdkp, SD_LBP_WS16);
2567 } else { /* LBP VPD page tells us what to use */
2569 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2570 sd_config_discard(sdkp, SD_LBP_UNMAP);
2571 else if (sdkp->lbpws)
2572 sd_config_discard(sdkp, SD_LBP_WS16);
2573 else if (sdkp->lbpws10)
2574 sd_config_discard(sdkp, SD_LBP_WS10);
2576 sd_config_discard(sdkp, SD_LBP_DISABLE);
2585 * sd_read_block_characteristics - Query block dev. characteristics
2586 * @disk: disk to query
2588 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2590 unsigned char *buffer;
2592 const int vpd_len = 64;
2594 buffer = kmalloc(vpd_len, GFP_KERNEL);
2597 /* Block Device Characteristics VPD */
2598 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2601 rot = get_unaligned_be16(&buffer[4]);
2604 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2611 * sd_read_block_provisioning - Query provisioning VPD page
2612 * @disk: disk to query
2614 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2616 unsigned char *buffer;
2617 const int vpd_len = 8;
2619 if (sdkp->lbpme == 0)
2622 buffer = kmalloc(vpd_len, GFP_KERNEL);
2624 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2628 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2629 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2630 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2636 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2638 if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2643 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2646 * Although VPD inquiries can go to SCSI-2 type devices,
2647 * some USB ones crash on receiving them, and the pages
2648 * we currently ask for are for SPC-3 and beyond
2650 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2656 * sd_revalidate_disk - called the first time a new disk is seen,
2657 * performs disk spin up, read_capacity, etc.
2658 * @disk: struct gendisk we care about
2660 static int sd_revalidate_disk(struct gendisk *disk)
2662 struct scsi_disk *sdkp = scsi_disk(disk);
2663 struct scsi_device *sdp = sdkp->device;
2664 unsigned char *buffer;
2667 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2668 "sd_revalidate_disk\n"));
2671 * If the device is offline, don't try and read capacity or any
2672 * of the other niceties.
2674 if (!scsi_device_online(sdp))
2677 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2679 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2680 "allocation failure.\n");
2684 sd_spinup_disk(sdkp);
2687 * Without media there is no reason to ask; moreover, some devices
2688 * react badly if we do.
2690 if (sdkp->media_present) {
2691 sd_read_capacity(sdkp, buffer);
2693 if (sd_try_extended_inquiry(sdp)) {
2694 sd_read_block_provisioning(sdkp);
2695 sd_read_block_limits(sdkp);
2696 sd_read_block_characteristics(sdkp);
2699 sd_read_write_protect_flag(sdkp, buffer);
2700 sd_read_cache_type(sdkp, buffer);
2701 sd_read_app_tag_own(sdkp, buffer);
2702 sd_read_write_same(sdkp, buffer);
2705 sdkp->first_scan = 0;
2708 * We now have all cache related info, determine how we deal
2709 * with flush requests.
2717 blk_queue_flush(sdkp->disk->queue, flush);
2719 set_capacity(disk, sdkp->capacity);
2720 sd_config_write_same(sdkp);
2728 * sd_unlock_native_capacity - unlock native capacity
2729 * @disk: struct gendisk to set capacity for
2731 * Block layer calls this function if it detects that partitions
2732 * on @disk reach beyond the end of the device. If the SCSI host
2733 * implements ->unlock_native_capacity() method, it's invoked to
2734 * give it a chance to adjust the device capacity.
2737 * Defined by block layer. Might sleep.
2739 static void sd_unlock_native_capacity(struct gendisk *disk)
2741 struct scsi_device *sdev = scsi_disk(disk)->device;
2743 if (sdev->host->hostt->unlock_native_capacity)
2744 sdev->host->hostt->unlock_native_capacity(sdev);
2748 * sd_format_disk_name - format disk name
2749 * @prefix: name prefix - ie. "sd" for SCSI disks
2750 * @index: index of the disk to format name for
2751 * @buf: output buffer
2752 * @buflen: length of the output buffer
2754 * SCSI disk names starts at sda. The 26th device is sdz and the
2755 * 27th is sdaa. The last one for two lettered suffix is sdzz
2756 * which is followed by sdaaa.
2758 * This is basically 26 base counting with one extra 'nil' entry
2759 * at the beginning from the second digit on and can be
2760 * determined using similar method as 26 base conversion with the
2761 * index shifted -1 after each digit is computed.
2767 * 0 on success, -errno on failure.
2769 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2771 const int base = 'z' - 'a' + 1;
2772 char *begin = buf + strlen(prefix);
2773 char *end = buf + buflen;
2783 *--p = 'a' + (index % unit);
2784 index = (index / unit) - 1;
2785 } while (index >= 0);
2787 memmove(begin, p, end - p);
2788 memcpy(buf, prefix, strlen(prefix));
2794 * The asynchronous part of sd_probe
2796 static void sd_probe_async(void *data, async_cookie_t cookie)
2798 struct scsi_disk *sdkp = data;
2799 struct scsi_device *sdp;
2806 index = sdkp->index;
2807 dev = &sdp->sdev_gendev;
2809 gd->major = sd_major((index & 0xf0) >> 4);
2810 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2811 gd->minors = SD_MINORS;
2813 gd->fops = &sd_fops;
2814 gd->private_data = &sdkp->driver;
2815 gd->queue = sdkp->device->request_queue;
2817 /* defaults, until the device tells us otherwise */
2818 sdp->sector_size = 512;
2820 sdkp->media_present = 1;
2821 sdkp->write_prot = 0;
2822 sdkp->cache_override = 0;
2826 sdkp->first_scan = 1;
2827 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2829 sd_revalidate_disk(gd);
2831 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2832 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2834 gd->driverfs_dev = &sdp->sdev_gendev;
2835 gd->flags = GENHD_FL_EXT_DEVT;
2836 if (sdp->removable) {
2837 gd->flags |= GENHD_FL_REMOVABLE;
2838 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2843 sd_dif_config_host(sdkp);
2845 sd_revalidate_disk(gd);
2847 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2848 sdp->removable ? "removable " : "");
2849 blk_pm_runtime_init(sdp->request_queue, dev);
2850 scsi_autopm_put_device(sdp);
2851 put_device(&sdkp->dev);
2855 * sd_probe - called during driver initialization and whenever a
2856 * new scsi device is attached to the system. It is called once
2857 * for each scsi device (not just disks) present.
2858 * @dev: pointer to device object
2860 * Returns 0 if successful (or not interested in this scsi device
2861 * (e.g. scanner)); 1 when there is an error.
2863 * Note: this function is invoked from the scsi mid-level.
2864 * This function sets up the mapping between a given
2865 * <host,channel,id,lun> (found in sdp) and new device name
2866 * (e.g. /dev/sda). More precisely it is the block device major
2867 * and minor number that is chosen here.
2869 * Assume sd_probe is not re-entrant (for time being)
2870 * Also think about sd_probe() and sd_remove() running coincidentally.
2872 static int sd_probe(struct device *dev)
2874 struct scsi_device *sdp = to_scsi_device(dev);
2875 struct scsi_disk *sdkp;
2881 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2884 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2888 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2892 gd = alloc_disk(SD_MINORS);
2897 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2900 spin_lock(&sd_index_lock);
2901 error = ida_get_new(&sd_index_ida, &index);
2902 spin_unlock(&sd_index_lock);
2903 } while (error == -EAGAIN);
2906 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2910 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2912 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2913 goto out_free_index;
2917 sdkp->driver = &sd_template;
2919 sdkp->index = index;
2920 atomic_set(&sdkp->openers, 0);
2921 atomic_set(&sdkp->device->ioerr_cnt, 0);
2923 if (!sdp->request_queue->rq_timeout) {
2924 if (sdp->type != TYPE_MOD)
2925 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2927 blk_queue_rq_timeout(sdp->request_queue,
2931 device_initialize(&sdkp->dev);
2932 sdkp->dev.parent = dev;
2933 sdkp->dev.class = &sd_disk_class;
2934 dev_set_name(&sdkp->dev, dev_name(dev));
2936 if (device_add(&sdkp->dev))
2937 goto out_free_index;
2940 dev_set_drvdata(dev, sdkp);
2942 get_device(&sdkp->dev); /* prevent release before async_schedule */
2943 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2948 spin_lock(&sd_index_lock);
2949 ida_remove(&sd_index_ida, index);
2950 spin_unlock(&sd_index_lock);
2960 * sd_remove - called whenever a scsi disk (previously recognized by
2961 * sd_probe) is detached from the system. It is called (potentially
2962 * multiple times) during sd module unload.
2963 * @sdp: pointer to mid level scsi device object
2965 * Note: this function is invoked from the scsi mid-level.
2966 * This function potentially frees up a device name (e.g. /dev/sdc)
2967 * that could be re-used by a subsequent sd_probe().
2968 * This function is not called when the built-in sd driver is "exit-ed".
2970 static int sd_remove(struct device *dev)
2972 struct scsi_disk *sdkp;
2974 sdkp = dev_get_drvdata(dev);
2975 scsi_autopm_get_device(sdkp->device);
2977 async_synchronize_full_domain(&scsi_sd_probe_domain);
2978 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2979 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2980 device_del(&sdkp->dev);
2981 del_gendisk(sdkp->disk);
2984 mutex_lock(&sd_ref_mutex);
2985 dev_set_drvdata(dev, NULL);
2986 put_device(&sdkp->dev);
2987 mutex_unlock(&sd_ref_mutex);
2993 * scsi_disk_release - Called to free the scsi_disk structure
2994 * @dev: pointer to embedded class device
2996 * sd_ref_mutex must be held entering this routine. Because it is
2997 * called on last put, you should always use the scsi_disk_get()
2998 * scsi_disk_put() helpers which manipulate the semaphore directly
2999 * and never do a direct put_device.
3001 static void scsi_disk_release(struct device *dev)
3003 struct scsi_disk *sdkp = to_scsi_disk(dev);
3004 struct gendisk *disk = sdkp->disk;
3006 spin_lock(&sd_index_lock);
3007 ida_remove(&sd_index_ida, sdkp->index);
3008 spin_unlock(&sd_index_lock);
3010 disk->private_data = NULL;
3012 put_device(&sdkp->device->sdev_gendev);
3017 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3019 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3020 struct scsi_sense_hdr sshdr;
3021 struct scsi_device *sdp = sdkp->device;
3025 cmd[4] |= 1; /* START */
3027 if (sdp->start_stop_pwr_cond)
3028 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3030 if (!scsi_device_online(sdp))
3033 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3034 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3036 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3037 sd_print_result(sdkp, res);
3038 if (driver_byte(res) & DRIVER_SENSE)
3039 sd_print_sense_hdr(sdkp, &sshdr);
3046 * Send a SYNCHRONIZE CACHE instruction down to the device through
3047 * the normal SCSI command structure. Wait for the command to
3050 static void sd_shutdown(struct device *dev)
3052 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3055 return; /* this can happen */
3057 if (pm_runtime_suspended(dev))
3061 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3062 sd_sync_cache(sdkp);
3065 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3066 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3067 sd_start_stop_device(sdkp, 0);
3071 scsi_disk_put(sdkp);
3074 static int sd_suspend(struct device *dev)
3076 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3080 return 0; /* this can happen */
3083 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3084 ret = sd_sync_cache(sdkp);
3089 if (sdkp->device->manage_start_stop) {
3090 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3091 ret = sd_start_stop_device(sdkp, 0);
3095 scsi_disk_put(sdkp);
3099 static int sd_resume(struct device *dev)
3101 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3104 if (!sdkp->device->manage_start_stop)
3107 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3108 ret = sd_start_stop_device(sdkp, 1);
3111 scsi_disk_put(sdkp);
3116 * init_sd - entry point for this driver (both when built in or when
3119 * Note: this function registers this driver with the scsi mid-level.
3121 static int __init init_sd(void)
3123 int majors = 0, i, err;
3125 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3127 for (i = 0; i < SD_MAJORS; i++)
3128 if (register_blkdev(sd_major(i), "sd") == 0)
3134 err = class_register(&sd_disk_class);
3138 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3140 if (!sd_cdb_cache) {
3141 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3145 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3147 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3151 err = scsi_register_driver(&sd_template.gendrv);
3153 goto err_out_driver;
3158 mempool_destroy(sd_cdb_pool);
3161 kmem_cache_destroy(sd_cdb_cache);
3164 class_unregister(&sd_disk_class);
3166 for (i = 0; i < SD_MAJORS; i++)
3167 unregister_blkdev(sd_major(i), "sd");
3172 * exit_sd - exit point for this driver (when it is a module).
3174 * Note: this function unregisters this driver from the scsi mid-level.
3176 static void __exit exit_sd(void)
3180 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3182 scsi_unregister_driver(&sd_template.gendrv);
3183 mempool_destroy(sd_cdb_pool);
3184 kmem_cache_destroy(sd_cdb_cache);
3186 class_unregister(&sd_disk_class);
3188 for (i = 0; i < SD_MAJORS; i++)
3189 unregister_blkdev(sd_major(i), "sd");
3192 module_init(init_sd);
3193 module_exit(exit_sd);
3195 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3196 struct scsi_sense_hdr *sshdr)
3198 sd_printk(KERN_INFO, sdkp, " ");
3199 scsi_show_sense_hdr(sshdr);
3200 sd_printk(KERN_INFO, sdkp, " ");
3201 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3204 static void sd_print_result(struct scsi_disk *sdkp, int result)
3206 sd_printk(KERN_INFO, sdkp, " ");
3207 scsi_show_result(result);