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 static 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 sdp->no_write_same = 0;
447 sdkp->max_ws_blocks = max;
450 sd_config_write_same(sdkp);
455 static struct device_attribute sd_disk_attrs[] = {
456 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
457 sd_store_cache_type),
458 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
459 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
460 sd_store_allow_restart),
461 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
462 sd_store_manage_start_stop),
463 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
464 sd_store_protection_type),
465 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
466 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
467 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
468 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
469 sd_store_provisioning_mode),
470 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
471 sd_show_write_same_blocks, sd_store_write_same_blocks),
472 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
473 sd_show_max_medium_access_timeouts,
474 sd_store_max_medium_access_timeouts),
478 static struct class sd_disk_class = {
480 .owner = THIS_MODULE,
481 .dev_release = scsi_disk_release,
482 .dev_attrs = sd_disk_attrs,
485 static const struct dev_pm_ops sd_pm_ops = {
486 .suspend = sd_suspend,
488 .poweroff = sd_suspend,
489 .restore = sd_resume,
490 .runtime_suspend = sd_suspend,
491 .runtime_resume = sd_resume,
494 static struct scsi_driver sd_template = {
495 .owner = THIS_MODULE,
500 .shutdown = sd_shutdown,
505 .eh_action = sd_eh_action,
509 * Device no to disk mapping:
511 * major disc2 disc p1
512 * |............|.............|....|....| <- dev_t
515 * Inside a major, we have 16k disks, however mapped non-
516 * contiguously. The first 16 disks are for major0, the next
517 * ones with major1, ... Disk 256 is for major0 again, disk 272
519 * As we stay compatible with our numbering scheme, we can reuse
520 * the well-know SCSI majors 8, 65--71, 136--143.
522 static int sd_major(int major_idx)
526 return SCSI_DISK0_MAJOR;
528 return SCSI_DISK1_MAJOR + major_idx - 1;
530 return SCSI_DISK8_MAJOR + major_idx - 8;
533 return 0; /* shut up gcc */
537 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
539 struct scsi_disk *sdkp = NULL;
541 if (disk->private_data) {
542 sdkp = scsi_disk(disk);
543 if (scsi_device_get(sdkp->device) == 0)
544 get_device(&sdkp->dev);
551 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
553 struct scsi_disk *sdkp;
555 mutex_lock(&sd_ref_mutex);
556 sdkp = __scsi_disk_get(disk);
557 mutex_unlock(&sd_ref_mutex);
561 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
563 struct scsi_disk *sdkp;
565 mutex_lock(&sd_ref_mutex);
566 sdkp = dev_get_drvdata(dev);
568 sdkp = __scsi_disk_get(sdkp->disk);
569 mutex_unlock(&sd_ref_mutex);
573 static void scsi_disk_put(struct scsi_disk *sdkp)
575 struct scsi_device *sdev = sdkp->device;
577 mutex_lock(&sd_ref_mutex);
578 put_device(&sdkp->dev);
579 scsi_device_put(sdev);
580 mutex_unlock(&sd_ref_mutex);
583 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
585 unsigned int prot_op = SCSI_PROT_NORMAL;
586 unsigned int dix = scsi_prot_sg_count(scmd);
588 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
590 prot_op = SCSI_PROT_READ_PASS;
591 else if (dif && !dix)
592 prot_op = SCSI_PROT_READ_STRIP;
593 else if (!dif && dix)
594 prot_op = SCSI_PROT_READ_INSERT;
597 prot_op = SCSI_PROT_WRITE_PASS;
598 else if (dif && !dix)
599 prot_op = SCSI_PROT_WRITE_INSERT;
600 else if (!dif && dix)
601 prot_op = SCSI_PROT_WRITE_STRIP;
604 scsi_set_prot_op(scmd, prot_op);
605 scsi_set_prot_type(scmd, dif);
608 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
610 struct request_queue *q = sdkp->disk->queue;
611 unsigned int logical_block_size = sdkp->device->sector_size;
612 unsigned int max_blocks = 0;
614 q->limits.discard_zeroes_data = sdkp->lbprz;
615 q->limits.discard_alignment = sdkp->unmap_alignment *
617 q->limits.discard_granularity =
618 max(sdkp->physical_block_size,
619 sdkp->unmap_granularity * logical_block_size);
621 sdkp->provisioning_mode = mode;
626 q->limits.max_discard_sectors = 0;
627 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
631 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
632 (u32)SD_MAX_WS16_BLOCKS);
636 max_blocks = min_not_zero(sdkp->max_ws_blocks,
637 (u32)SD_MAX_WS16_BLOCKS);
641 max_blocks = min_not_zero(sdkp->max_ws_blocks,
642 (u32)SD_MAX_WS10_BLOCKS);
646 max_blocks = min_not_zero(sdkp->max_ws_blocks,
647 (u32)SD_MAX_WS10_BLOCKS);
648 q->limits.discard_zeroes_data = 1;
652 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
653 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
657 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
658 * @sdp: scsi device to operate one
659 * @rq: Request to prepare
661 * Will issue either UNMAP or WRITE SAME(16) depending on preference
662 * indicated by target device.
664 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
666 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
667 sector_t sector = blk_rq_pos(rq);
668 unsigned int nr_sectors = blk_rq_sectors(rq);
669 unsigned int nr_bytes = blk_rq_bytes(rq);
675 sector >>= ilog2(sdp->sector_size) - 9;
676 nr_sectors >>= ilog2(sdp->sector_size) - 9;
677 rq->timeout = SD_TIMEOUT;
679 memset(rq->cmd, 0, rq->cmd_len);
681 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
683 return BLKPREP_DEFER;
685 switch (sdkp->provisioning_mode) {
687 buf = page_address(page);
693 put_unaligned_be16(6 + 16, &buf[0]);
694 put_unaligned_be16(16, &buf[2]);
695 put_unaligned_be64(sector, &buf[8]);
696 put_unaligned_be32(nr_sectors, &buf[16]);
703 rq->cmd[0] = WRITE_SAME_16;
704 rq->cmd[1] = 0x8; /* UNMAP */
705 put_unaligned_be64(sector, &rq->cmd[2]);
706 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
708 len = sdkp->device->sector_size;
714 rq->cmd[0] = WRITE_SAME;
715 if (sdkp->provisioning_mode == SD_LBP_WS10)
716 rq->cmd[1] = 0x8; /* UNMAP */
717 put_unaligned_be32(sector, &rq->cmd[2]);
718 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
720 len = sdkp->device->sector_size;
728 blk_add_request_payload(rq, page, len);
729 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
730 rq->buffer = page_address(page);
731 rq->__data_len = nr_bytes;
734 if (ret != BLKPREP_OK) {
741 static void sd_config_write_same(struct scsi_disk *sdkp)
743 struct request_queue *q = sdkp->disk->queue;
744 unsigned int logical_block_size = sdkp->device->sector_size;
746 if (sdkp->device->no_write_same) {
747 sdkp->max_ws_blocks = 0;
751 /* Some devices can not handle block counts above 0xffff despite
752 * supporting WRITE SAME(16). Consequently we default to 64k
753 * blocks per I/O unless the device explicitly advertises a
756 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
757 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
758 (u32)SD_MAX_WS16_BLOCKS);
759 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
760 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
761 (u32)SD_MAX_WS10_BLOCKS);
763 sdkp->device->no_write_same = 1;
764 sdkp->max_ws_blocks = 0;
768 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
769 (logical_block_size >> 9));
773 * sd_setup_write_same_cmnd - write the same data to multiple blocks
774 * @sdp: scsi device to operate one
775 * @rq: Request to prepare
777 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
778 * preference indicated by target device.
780 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
782 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
783 struct bio *bio = rq->bio;
784 sector_t sector = blk_rq_pos(rq);
785 unsigned int nr_sectors = blk_rq_sectors(rq);
786 unsigned int nr_bytes = blk_rq_bytes(rq);
789 if (sdkp->device->no_write_same)
792 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
794 sector >>= ilog2(sdp->sector_size) - 9;
795 nr_sectors >>= ilog2(sdp->sector_size) - 9;
797 rq->__data_len = sdp->sector_size;
798 rq->timeout = SD_WRITE_SAME_TIMEOUT;
799 memset(rq->cmd, 0, rq->cmd_len);
801 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
803 rq->cmd[0] = WRITE_SAME_16;
804 put_unaligned_be64(sector, &rq->cmd[2]);
805 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
808 rq->cmd[0] = WRITE_SAME;
809 put_unaligned_be32(sector, &rq->cmd[2]);
810 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
813 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
814 rq->__data_len = nr_bytes;
819 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
821 rq->timeout = SD_FLUSH_TIMEOUT;
822 rq->retries = SD_MAX_RETRIES;
823 rq->cmd[0] = SYNCHRONIZE_CACHE;
826 return scsi_setup_blk_pc_cmnd(sdp, rq);
829 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
831 struct scsi_cmnd *SCpnt = rq->special;
833 if (rq->cmd_flags & REQ_DISCARD) {
834 free_page((unsigned long)rq->buffer);
837 if (SCpnt->cmnd != rq->cmd) {
838 mempool_free(SCpnt->cmnd, sd_cdb_pool);
845 * sd_prep_fn - build a scsi (read or write) command from
846 * information in the request structure.
847 * @SCpnt: pointer to mid-level's per scsi command structure that
848 * contains request and into which the scsi command is written
850 * Returns 1 if successful and 0 if error (or cannot be done now).
852 static int sd_prep_fn(struct request_queue *q, struct request *rq)
854 struct scsi_cmnd *SCpnt;
855 struct scsi_device *sdp = q->queuedata;
856 struct gendisk *disk = rq->rq_disk;
857 struct scsi_disk *sdkp;
858 sector_t block = blk_rq_pos(rq);
860 unsigned int this_count = blk_rq_sectors(rq);
862 unsigned char protect;
865 * Discard request come in as REQ_TYPE_FS but we turn them into
866 * block PC requests to make life easier.
868 if (rq->cmd_flags & REQ_DISCARD) {
869 ret = sd_setup_discard_cmnd(sdp, rq);
871 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
872 ret = sd_setup_write_same_cmnd(sdp, rq);
874 } else if (rq->cmd_flags & REQ_FLUSH) {
875 ret = scsi_setup_flush_cmnd(sdp, rq);
877 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
878 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
880 } else if (rq->cmd_type != REQ_TYPE_FS) {
884 ret = scsi_setup_fs_cmnd(sdp, rq);
885 if (ret != BLKPREP_OK)
888 sdkp = scsi_disk(disk);
890 /* from here on until we're complete, any goto out
891 * is used for a killable error condition */
894 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
895 "sd_prep_fn: block=%llu, "
897 (unsigned long long)block,
900 if (!sdp || !scsi_device_online(sdp) ||
901 block + blk_rq_sectors(rq) > get_capacity(disk)) {
902 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
903 "Finishing %u sectors\n",
904 blk_rq_sectors(rq)));
905 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
906 "Retry with 0x%p\n", SCpnt));
912 * quietly refuse to do anything to a changed disc until
913 * the changed bit has been reset
915 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
920 * Some SD card readers can't handle multi-sector accesses which touch
921 * the last one or two hardware sectors. Split accesses as needed.
923 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
924 (sdp->sector_size / 512);
926 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
927 if (block < threshold) {
928 /* Access up to the threshold but not beyond */
929 this_count = threshold - block;
931 /* Access only a single hardware sector */
932 this_count = sdp->sector_size / 512;
936 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
937 (unsigned long long)block));
940 * If we have a 1K hardware sectorsize, prevent access to single
941 * 512 byte sectors. In theory we could handle this - in fact
942 * the scsi cdrom driver must be able to handle this because
943 * we typically use 1K blocksizes, and cdroms typically have
944 * 2K hardware sectorsizes. Of course, things are simpler
945 * with the cdrom, since it is read-only. For performance
946 * reasons, the filesystems should be able to handle this
947 * and not force the scsi disk driver to use bounce buffers
950 if (sdp->sector_size == 1024) {
951 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
957 this_count = this_count >> 1;
960 if (sdp->sector_size == 2048) {
961 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
967 this_count = this_count >> 2;
970 if (sdp->sector_size == 4096) {
971 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
972 scmd_printk(KERN_ERR, SCpnt,
973 "Bad block number requested\n");
977 this_count = this_count >> 3;
980 if (rq_data_dir(rq) == WRITE) {
981 if (!sdp->writeable) {
984 SCpnt->cmnd[0] = WRITE_6;
985 SCpnt->sc_data_direction = DMA_TO_DEVICE;
987 if (blk_integrity_rq(rq))
988 sd_dif_prepare(rq, block, sdp->sector_size);
990 } else if (rq_data_dir(rq) == READ) {
991 SCpnt->cmnd[0] = READ_6;
992 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
994 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
998 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
999 "%s %d/%u 512 byte blocks.\n",
1000 (rq_data_dir(rq) == WRITE) ?
1001 "writing" : "reading", this_count,
1002 blk_rq_sectors(rq)));
1004 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1005 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1011 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1012 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1014 if (unlikely(SCpnt->cmnd == NULL)) {
1015 ret = BLKPREP_DEFER;
1019 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1020 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1021 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1022 SCpnt->cmnd[7] = 0x18;
1023 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1024 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1027 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1028 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1029 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1030 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1031 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1032 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1033 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1034 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1036 /* Expected Indirect LBA */
1037 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1038 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1039 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1040 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1042 /* Transfer length */
1043 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1044 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1045 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1046 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1047 } else if (sdp->use_16_for_rw) {
1048 SCpnt->cmnd[0] += READ_16 - READ_6;
1049 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1050 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1051 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1052 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1053 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1054 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1055 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1056 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1057 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1058 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1059 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1060 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1061 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1062 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1063 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1064 scsi_device_protection(SCpnt->device) ||
1065 SCpnt->device->use_10_for_rw) {
1066 if (this_count > 0xffff)
1067 this_count = 0xffff;
1069 SCpnt->cmnd[0] += READ_10 - READ_6;
1070 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1071 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1072 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1073 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1074 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1075 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1076 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1077 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1079 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1081 * This happens only if this drive failed
1082 * 10byte rw command with ILLEGAL_REQUEST
1083 * during operation and thus turned off
1086 scmd_printk(KERN_ERR, SCpnt,
1087 "FUA write on READ/WRITE(6) drive\n");
1091 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1092 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1093 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[4] = (unsigned char) this_count;
1097 SCpnt->sdb.length = this_count * sdp->sector_size;
1099 /* If DIF or DIX is enabled, tell HBA how to handle request */
1100 if (host_dif || scsi_prot_sg_count(SCpnt))
1101 sd_prot_op(SCpnt, host_dif);
1104 * We shouldn't disconnect in the middle of a sector, so with a dumb
1105 * host adapter, it's safe to assume that we can at least transfer
1106 * this many bytes between each connect / disconnect.
1108 SCpnt->transfersize = sdp->sector_size;
1109 SCpnt->underflow = this_count << 9;
1110 SCpnt->allowed = SD_MAX_RETRIES;
1113 * This indicates that the command is ready from our end to be
1118 return scsi_prep_return(q, rq, ret);
1122 * sd_open - open a scsi disk device
1123 * @inode: only i_rdev member may be used
1124 * @filp: only f_mode and f_flags may be used
1126 * Returns 0 if successful. Returns a negated errno value in case
1129 * Note: This can be called from a user context (e.g. fsck(1) )
1130 * or from within the kernel (e.g. as a result of a mount(1) ).
1131 * In the latter case @inode and @filp carry an abridged amount
1132 * of information as noted above.
1134 * Locking: called with bdev->bd_mutex held.
1136 static int sd_open(struct block_device *bdev, fmode_t mode)
1138 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1139 struct scsi_device *sdev;
1145 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1147 sdev = sdkp->device;
1150 * If the device is in error recovery, wait until it is done.
1151 * If the device is offline, then disallow any access to it.
1154 if (!scsi_block_when_processing_errors(sdev))
1157 if (sdev->removable || sdkp->write_prot)
1158 check_disk_change(bdev);
1161 * If the drive is empty, just let the open fail.
1163 retval = -ENOMEDIUM;
1164 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1168 * If the device has the write protect tab set, have the open fail
1169 * if the user expects to be able to write to the thing.
1172 if (sdkp->write_prot && (mode & FMODE_WRITE))
1176 * It is possible that the disk changing stuff resulted in
1177 * the device being taken offline. If this is the case,
1178 * report this to the user, and don't pretend that the
1179 * open actually succeeded.
1182 if (!scsi_device_online(sdev))
1185 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1186 if (scsi_block_when_processing_errors(sdev))
1187 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1193 scsi_disk_put(sdkp);
1198 * sd_release - invoked when the (last) close(2) is called on this
1200 * @inode: only i_rdev member may be used
1201 * @filp: only f_mode and f_flags may be used
1205 * Note: may block (uninterruptible) if error recovery is underway
1208 * Locking: called with bdev->bd_mutex held.
1210 static void sd_release(struct gendisk *disk, fmode_t mode)
1212 struct scsi_disk *sdkp = scsi_disk(disk);
1213 struct scsi_device *sdev = sdkp->device;
1215 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1217 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1218 if (scsi_block_when_processing_errors(sdev))
1219 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1223 * XXX and what if there are packets in flight and this close()
1224 * XXX is followed by a "rmmod sd_mod"?
1227 scsi_disk_put(sdkp);
1230 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1232 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1233 struct scsi_device *sdp = sdkp->device;
1234 struct Scsi_Host *host = sdp->host;
1237 /* default to most commonly used values */
1238 diskinfo[0] = 0x40; /* 1 << 6 */
1239 diskinfo[1] = 0x20; /* 1 << 5 */
1240 diskinfo[2] = sdkp->capacity >> 11;
1242 /* override with calculated, extended default, or driver values */
1243 if (host->hostt->bios_param)
1244 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1246 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1248 geo->heads = diskinfo[0];
1249 geo->sectors = diskinfo[1];
1250 geo->cylinders = diskinfo[2];
1255 * sd_ioctl - process an ioctl
1256 * @inode: only i_rdev/i_bdev members may be used
1257 * @filp: only f_mode and f_flags may be used
1258 * @cmd: ioctl command number
1259 * @arg: this is third argument given to ioctl(2) system call.
1260 * Often contains a pointer.
1262 * Returns 0 if successful (some ioctls return positive numbers on
1263 * success as well). Returns a negated errno value in case of error.
1265 * Note: most ioctls are forward onto the block subsystem or further
1266 * down in the scsi subsystem.
1268 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1269 unsigned int cmd, unsigned long arg)
1271 struct gendisk *disk = bdev->bd_disk;
1272 struct scsi_disk *sdkp = scsi_disk(disk);
1273 struct scsi_device *sdp = sdkp->device;
1274 void __user *p = (void __user *)arg;
1277 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1278 "cmd=0x%x\n", disk->disk_name, cmd));
1280 error = scsi_verify_blk_ioctl(bdev, cmd);
1285 * If we are in the middle of error recovery, don't let anyone
1286 * else try and use this device. Also, if error recovery fails, it
1287 * may try and take the device offline, in which case all further
1288 * access to the device is prohibited.
1290 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1291 (mode & FMODE_NDELAY) != 0);
1292 if (!scsi_block_when_processing_errors(sdp) || !error)
1296 * Send SCSI addressing ioctls directly to mid level, send other
1297 * ioctls to block level and then onto mid level if they can't be
1301 case SCSI_IOCTL_GET_IDLUN:
1302 case SCSI_IOCTL_GET_BUS_NUMBER:
1303 error = scsi_ioctl(sdp, cmd, p);
1306 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1307 if (error != -ENOTTY)
1309 error = scsi_ioctl(sdp, cmd, p);
1316 static void set_media_not_present(struct scsi_disk *sdkp)
1318 if (sdkp->media_present)
1319 sdkp->device->changed = 1;
1321 if (sdkp->device->removable) {
1322 sdkp->media_present = 0;
1327 static int media_not_present(struct scsi_disk *sdkp,
1328 struct scsi_sense_hdr *sshdr)
1330 if (!scsi_sense_valid(sshdr))
1333 /* not invoked for commands that could return deferred errors */
1334 switch (sshdr->sense_key) {
1335 case UNIT_ATTENTION:
1337 /* medium not present */
1338 if (sshdr->asc == 0x3A) {
1339 set_media_not_present(sdkp);
1347 * sd_check_events - check media events
1348 * @disk: kernel device descriptor
1349 * @clearing: disk events currently being cleared
1351 * Returns mask of DISK_EVENT_*.
1353 * Note: this function is invoked from the block subsystem.
1355 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1357 struct scsi_disk *sdkp = scsi_disk(disk);
1358 struct scsi_device *sdp = sdkp->device;
1359 struct scsi_sense_hdr *sshdr = NULL;
1362 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1365 * If the device is offline, don't send any commands - just pretend as
1366 * if the command failed. If the device ever comes back online, we
1367 * can deal with it then. It is only because of unrecoverable errors
1368 * that we would ever take a device offline in the first place.
1370 if (!scsi_device_online(sdp)) {
1371 set_media_not_present(sdkp);
1376 * Using TEST_UNIT_READY enables differentiation between drive with
1377 * no cartridge loaded - NOT READY, drive with changed cartridge -
1378 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1380 * Drives that auto spin down. eg iomega jaz 1G, will be started
1381 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1382 * sd_revalidate() is called.
1386 if (scsi_block_when_processing_errors(sdp)) {
1387 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1388 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1392 /* failed to execute TUR, assume media not present */
1393 if (host_byte(retval)) {
1394 set_media_not_present(sdkp);
1398 if (media_not_present(sdkp, sshdr))
1402 * For removable scsi disk we have to recognise the presence
1403 * of a disk in the drive.
1405 if (!sdkp->media_present)
1407 sdkp->media_present = 1;
1410 * sdp->changed is set under the following conditions:
1412 * Medium present state has changed in either direction.
1413 * Device has indicated UNIT_ATTENTION.
1416 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1421 static int sd_sync_cache(struct scsi_disk *sdkp)
1424 struct scsi_device *sdp = sdkp->device;
1425 struct scsi_sense_hdr sshdr;
1427 if (!scsi_device_online(sdp))
1431 for (retries = 3; retries > 0; --retries) {
1432 unsigned char cmd[10] = { 0 };
1434 cmd[0] = SYNCHRONIZE_CACHE;
1436 * Leave the rest of the command zero to indicate
1439 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1440 &sshdr, SD_FLUSH_TIMEOUT,
1441 SD_MAX_RETRIES, NULL, REQ_PM);
1447 sd_print_result(sdkp, res);
1448 if (driver_byte(res) & DRIVER_SENSE)
1449 sd_print_sense_hdr(sdkp, &sshdr);
1457 static void sd_rescan(struct device *dev)
1459 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1462 revalidate_disk(sdkp->disk);
1463 scsi_disk_put(sdkp);
1468 #ifdef CONFIG_COMPAT
1470 * This gets directly called from VFS. When the ioctl
1471 * is not recognized we go back to the other translation paths.
1473 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1474 unsigned int cmd, unsigned long arg)
1476 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1479 ret = scsi_verify_blk_ioctl(bdev, cmd);
1484 * If we are in the middle of error recovery, don't let anyone
1485 * else try and use this device. Also, if error recovery fails, it
1486 * may try and take the device offline, in which case all further
1487 * access to the device is prohibited.
1489 if (!scsi_block_when_processing_errors(sdev))
1492 if (sdev->host->hostt->compat_ioctl) {
1493 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1499 * Let the static ioctl translation table take care of it.
1501 return -ENOIOCTLCMD;
1505 static const struct block_device_operations sd_fops = {
1506 .owner = THIS_MODULE,
1508 .release = sd_release,
1510 .getgeo = sd_getgeo,
1511 #ifdef CONFIG_COMPAT
1512 .compat_ioctl = sd_compat_ioctl,
1514 .check_events = sd_check_events,
1515 .revalidate_disk = sd_revalidate_disk,
1516 .unlock_native_capacity = sd_unlock_native_capacity,
1520 * sd_eh_action - error handling callback
1521 * @scmd: sd-issued command that has failed
1522 * @eh_cmnd: The command that was sent during error handling
1523 * @eh_cmnd_len: Length of eh_cmnd in bytes
1524 * @eh_disp: The recovery disposition suggested by the midlayer
1526 * This function is called by the SCSI midlayer upon completion of
1527 * an error handling command (TEST UNIT READY, START STOP UNIT,
1528 * etc.) The command sent to the device by the error handler is
1529 * stored in eh_cmnd. The result of sending the eh command is
1530 * passed in eh_disp.
1532 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1533 int eh_cmnd_len, int eh_disp)
1535 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1537 if (!scsi_device_online(scmd->device) ||
1538 !scsi_medium_access_command(scmd))
1542 * The device has timed out executing a medium access command.
1543 * However, the TEST UNIT READY command sent during error
1544 * handling completed successfully. Either the device is in the
1545 * process of recovering or has it suffered an internal failure
1546 * that prevents access to the storage medium.
1548 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1549 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1550 sdkp->medium_access_timed_out++;
1553 * If the device keeps failing read/write commands but TEST UNIT
1554 * READY always completes successfully we assume that medium
1555 * access is no longer possible and take the device offline.
1557 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1558 scmd_printk(KERN_ERR, scmd,
1559 "Medium access timeout failure. Offlining disk!\n");
1560 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1568 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1570 u64 start_lba = blk_rq_pos(scmd->request);
1571 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1575 * resid is optional but mostly filled in. When it's unused,
1576 * its value is zero, so we assume the whole buffer transferred
1578 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1579 unsigned int good_bytes;
1581 if (scmd->request->cmd_type != REQ_TYPE_FS)
1584 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1585 SCSI_SENSE_BUFFERSIZE,
1590 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1593 if (scmd->device->sector_size < 512) {
1594 /* only legitimate sector_size here is 256 */
1598 /* be careful ... don't want any overflows */
1599 u64 factor = scmd->device->sector_size / 512;
1600 do_div(start_lba, factor);
1601 do_div(end_lba, factor);
1604 /* The bad lba was reported incorrectly, we have no idea where
1607 if (bad_lba < start_lba || bad_lba >= end_lba)
1610 /* This computation should always be done in terms of
1611 * the resolution of the device's medium.
1613 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1614 return min(good_bytes, transferred);
1618 * sd_done - bottom half handler: called when the lower level
1619 * driver has completed (successfully or otherwise) a scsi command.
1620 * @SCpnt: mid-level's per command structure.
1622 * Note: potentially run from within an ISR. Must not block.
1624 static int sd_done(struct scsi_cmnd *SCpnt)
1626 int result = SCpnt->result;
1627 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1628 struct scsi_sense_hdr sshdr;
1629 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1630 struct request *req = SCpnt->request;
1631 int sense_valid = 0;
1632 int sense_deferred = 0;
1633 unsigned char op = SCpnt->cmnd[0];
1634 unsigned char unmap = SCpnt->cmnd[1] & 8;
1636 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1638 good_bytes = blk_rq_bytes(req);
1639 scsi_set_resid(SCpnt, 0);
1642 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1647 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1649 sense_deferred = scsi_sense_is_deferred(&sshdr);
1651 #ifdef CONFIG_SCSI_LOGGING
1652 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1654 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1655 "sd_done: sb[respc,sk,asc,"
1656 "ascq]=%x,%x,%x,%x\n",
1657 sshdr.response_code,
1658 sshdr.sense_key, sshdr.asc,
1662 if (driver_byte(result) != DRIVER_SENSE &&
1663 (!sense_valid || sense_deferred))
1666 sdkp->medium_access_timed_out = 0;
1668 switch (sshdr.sense_key) {
1669 case HARDWARE_ERROR:
1671 good_bytes = sd_completed_bytes(SCpnt);
1673 case RECOVERED_ERROR:
1674 good_bytes = scsi_bufflen(SCpnt);
1677 /* This indicates a false check condition, so ignore it. An
1678 * unknown amount of data was transferred so treat it as an
1681 scsi_print_sense("sd", SCpnt);
1683 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1685 case ABORTED_COMMAND:
1686 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1687 good_bytes = sd_completed_bytes(SCpnt);
1689 case ILLEGAL_REQUEST:
1690 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1691 good_bytes = sd_completed_bytes(SCpnt);
1692 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1693 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1696 sd_config_discard(sdkp, SD_LBP_DISABLE);
1701 sd_config_discard(sdkp, SD_LBP_DISABLE);
1703 sdkp->device->no_write_same = 1;
1704 sd_config_write_same(sdkp);
1707 req->__data_len = blk_rq_bytes(req);
1708 req->cmd_flags |= REQ_QUIET;
1717 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1718 sd_dif_complete(SCpnt, good_bytes);
1724 * spinup disk - called only in sd_revalidate_disk()
1727 sd_spinup_disk(struct scsi_disk *sdkp)
1729 unsigned char cmd[10];
1730 unsigned long spintime_expire = 0;
1731 int retries, spintime;
1732 unsigned int the_result;
1733 struct scsi_sense_hdr sshdr;
1734 int sense_valid = 0;
1738 /* Spin up drives, as required. Only do this at boot time */
1739 /* Spinup needs to be done for module loads too. */
1744 cmd[0] = TEST_UNIT_READY;
1745 memset((void *) &cmd[1], 0, 9);
1747 the_result = scsi_execute_req(sdkp->device, cmd,
1750 SD_MAX_RETRIES, NULL);
1753 * If the drive has indicated to us that it
1754 * doesn't have any media in it, don't bother
1755 * with any more polling.
1757 if (media_not_present(sdkp, &sshdr))
1761 sense_valid = scsi_sense_valid(&sshdr);
1763 } while (retries < 3 &&
1764 (!scsi_status_is_good(the_result) ||
1765 ((driver_byte(the_result) & DRIVER_SENSE) &&
1766 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1768 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1769 /* no sense, TUR either succeeded or failed
1770 * with a status error */
1771 if(!spintime && !scsi_status_is_good(the_result)) {
1772 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1773 sd_print_result(sdkp, the_result);
1779 * The device does not want the automatic start to be issued.
1781 if (sdkp->device->no_start_on_add)
1784 if (sense_valid && sshdr.sense_key == NOT_READY) {
1785 if (sshdr.asc == 4 && sshdr.ascq == 3)
1786 break; /* manual intervention required */
1787 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1788 break; /* standby */
1789 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1790 break; /* unavailable */
1792 * Issue command to spin up drive when not ready
1795 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1796 cmd[0] = START_STOP;
1797 cmd[1] = 1; /* Return immediately */
1798 memset((void *) &cmd[2], 0, 8);
1799 cmd[4] = 1; /* Start spin cycle */
1800 if (sdkp->device->start_stop_pwr_cond)
1802 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1804 SD_TIMEOUT, SD_MAX_RETRIES,
1806 spintime_expire = jiffies + 100 * HZ;
1809 /* Wait 1 second for next try */
1814 * Wait for USB flash devices with slow firmware.
1815 * Yes, this sense key/ASC combination shouldn't
1816 * occur here. It's characteristic of these devices.
1818 } else if (sense_valid &&
1819 sshdr.sense_key == UNIT_ATTENTION &&
1820 sshdr.asc == 0x28) {
1822 spintime_expire = jiffies + 5 * HZ;
1825 /* Wait 1 second for next try */
1828 /* we don't understand the sense code, so it's
1829 * probably pointless to loop */
1831 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1832 sd_print_sense_hdr(sdkp, &sshdr);
1837 } while (spintime && time_before_eq(jiffies, spintime_expire));
1840 if (scsi_status_is_good(the_result))
1843 printk("not responding...\n");
1849 * Determine whether disk supports Data Integrity Field.
1851 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1853 struct scsi_device *sdp = sdkp->device;
1857 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1860 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1862 if (type > SD_DIF_TYPE3_PROTECTION)
1864 else if (scsi_host_dif_capable(sdp->host, type))
1867 if (sdkp->first_scan || type != sdkp->protection_type)
1870 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1871 " protection type %u. Disabling disk!\n",
1875 sd_printk(KERN_NOTICE, sdkp,
1876 "Enabling DIF Type %u protection\n", type);
1879 sd_printk(KERN_NOTICE, sdkp,
1880 "Disabling DIF Type %u protection\n", type);
1884 sdkp->protection_type = type;
1889 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1890 struct scsi_sense_hdr *sshdr, int sense_valid,
1893 sd_print_result(sdkp, the_result);
1894 if (driver_byte(the_result) & DRIVER_SENSE)
1895 sd_print_sense_hdr(sdkp, sshdr);
1897 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1900 * Set dirty bit for removable devices if not ready -
1901 * sometimes drives will not report this properly.
1903 if (sdp->removable &&
1904 sense_valid && sshdr->sense_key == NOT_READY)
1905 set_media_not_present(sdkp);
1908 * We used to set media_present to 0 here to indicate no media
1909 * in the drive, but some drives fail read capacity even with
1910 * media present, so we can't do that.
1912 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1916 #if RC16_LEN > SD_BUF_SIZE
1917 #error RC16_LEN must not be more than SD_BUF_SIZE
1920 #define READ_CAPACITY_RETRIES_ON_RESET 10
1922 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1923 unsigned char *buffer)
1925 unsigned char cmd[16];
1926 struct scsi_sense_hdr sshdr;
1927 int sense_valid = 0;
1929 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1930 unsigned int alignment;
1931 unsigned long long lba;
1932 unsigned sector_size;
1934 if (sdp->no_read_capacity_16)
1939 cmd[0] = SERVICE_ACTION_IN;
1940 cmd[1] = SAI_READ_CAPACITY_16;
1942 memset(buffer, 0, RC16_LEN);
1944 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1945 buffer, RC16_LEN, &sshdr,
1946 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1948 if (media_not_present(sdkp, &sshdr))
1952 sense_valid = scsi_sense_valid(&sshdr);
1954 sshdr.sense_key == ILLEGAL_REQUEST &&
1955 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1957 /* Invalid Command Operation Code or
1958 * Invalid Field in CDB, just retry
1959 * silently with RC10 */
1962 sshdr.sense_key == UNIT_ATTENTION &&
1963 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1964 /* Device reset might occur several times,
1965 * give it one more chance */
1966 if (--reset_retries > 0)
1971 } while (the_result && retries);
1974 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1975 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1979 sector_size = get_unaligned_be32(&buffer[8]);
1980 lba = get_unaligned_be64(&buffer[0]);
1982 if (sd_read_protection_type(sdkp, buffer) < 0) {
1987 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1988 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1989 "kernel compiled with support for large block "
1995 /* Logical blocks per physical block exponent */
1996 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1998 /* Lowest aligned logical block */
1999 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2000 blk_queue_alignment_offset(sdp->request_queue, alignment);
2001 if (alignment && sdkp->first_scan)
2002 sd_printk(KERN_NOTICE, sdkp,
2003 "physical block alignment offset: %u\n", alignment);
2005 if (buffer[14] & 0x80) { /* LBPME */
2008 if (buffer[14] & 0x40) /* LBPRZ */
2011 sd_config_discard(sdkp, SD_LBP_WS16);
2014 sdkp->capacity = lba + 1;
2018 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2019 unsigned char *buffer)
2021 unsigned char cmd[16];
2022 struct scsi_sense_hdr sshdr;
2023 int sense_valid = 0;
2025 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2027 unsigned sector_size;
2030 cmd[0] = READ_CAPACITY;
2031 memset(&cmd[1], 0, 9);
2032 memset(buffer, 0, 8);
2034 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2036 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2038 if (media_not_present(sdkp, &sshdr))
2042 sense_valid = scsi_sense_valid(&sshdr);
2044 sshdr.sense_key == UNIT_ATTENTION &&
2045 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2046 /* Device reset might occur several times,
2047 * give it one more chance */
2048 if (--reset_retries > 0)
2053 } while (the_result && retries);
2056 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2057 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2061 sector_size = get_unaligned_be32(&buffer[4]);
2062 lba = get_unaligned_be32(&buffer[0]);
2064 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2065 /* Some buggy (usb cardreader) devices return an lba of
2066 0xffffffff when the want to report a size of 0 (with
2067 which they really mean no media is present) */
2069 sdkp->physical_block_size = sector_size;
2073 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2074 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2075 "kernel compiled with support for large block "
2081 sdkp->capacity = lba + 1;
2082 sdkp->physical_block_size = sector_size;
2086 static int sd_try_rc16_first(struct scsi_device *sdp)
2088 if (sdp->host->max_cmd_len < 16)
2090 if (sdp->try_rc_10_first)
2092 if (sdp->scsi_level > SCSI_SPC_2)
2094 if (scsi_device_protection(sdp))
2100 * read disk capacity
2103 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2106 struct scsi_device *sdp = sdkp->device;
2107 sector_t old_capacity = sdkp->capacity;
2109 if (sd_try_rc16_first(sdp)) {
2110 sector_size = read_capacity_16(sdkp, sdp, buffer);
2111 if (sector_size == -EOVERFLOW)
2113 if (sector_size == -ENODEV)
2115 if (sector_size < 0)
2116 sector_size = read_capacity_10(sdkp, sdp, buffer);
2117 if (sector_size < 0)
2120 sector_size = read_capacity_10(sdkp, sdp, buffer);
2121 if (sector_size == -EOVERFLOW)
2123 if (sector_size < 0)
2125 if ((sizeof(sdkp->capacity) > 4) &&
2126 (sdkp->capacity > 0xffffffffULL)) {
2127 int old_sector_size = sector_size;
2128 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2129 "Trying to use READ CAPACITY(16).\n");
2130 sector_size = read_capacity_16(sdkp, sdp, buffer);
2131 if (sector_size < 0) {
2132 sd_printk(KERN_NOTICE, sdkp,
2133 "Using 0xffffffff as device size\n");
2134 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2135 sector_size = old_sector_size;
2141 /* Some devices are known to return the total number of blocks,
2142 * not the highest block number. Some devices have versions
2143 * which do this and others which do not. Some devices we might
2144 * suspect of doing this but we don't know for certain.
2146 * If we know the reported capacity is wrong, decrement it. If
2147 * we can only guess, then assume the number of blocks is even
2148 * (usually true but not always) and err on the side of lowering
2151 if (sdp->fix_capacity ||
2152 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2153 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2154 "from its reported value: %llu\n",
2155 (unsigned long long) sdkp->capacity);
2160 if (sector_size == 0) {
2162 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2166 if (sector_size != 512 &&
2167 sector_size != 1024 &&
2168 sector_size != 2048 &&
2169 sector_size != 4096 &&
2170 sector_size != 256) {
2171 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2174 * The user might want to re-format the drive with
2175 * a supported sectorsize. Once this happens, it
2176 * would be relatively trivial to set the thing up.
2177 * For this reason, we leave the thing in the table.
2181 * set a bogus sector size so the normal read/write
2182 * logic in the block layer will eventually refuse any
2183 * request on this device without tripping over power
2184 * of two sector size assumptions
2188 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2191 char cap_str_2[10], cap_str_10[10];
2192 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2194 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2196 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2197 sizeof(cap_str_10));
2199 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2200 sd_printk(KERN_NOTICE, sdkp,
2201 "%llu %d-byte logical blocks: (%s/%s)\n",
2202 (unsigned long long)sdkp->capacity,
2203 sector_size, cap_str_10, cap_str_2);
2205 if (sdkp->physical_block_size != sector_size)
2206 sd_printk(KERN_NOTICE, sdkp,
2207 "%u-byte physical blocks\n",
2208 sdkp->physical_block_size);
2212 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2214 /* Rescale capacity to 512-byte units */
2215 if (sector_size == 4096)
2216 sdkp->capacity <<= 3;
2217 else if (sector_size == 2048)
2218 sdkp->capacity <<= 2;
2219 else if (sector_size == 1024)
2220 sdkp->capacity <<= 1;
2221 else if (sector_size == 256)
2222 sdkp->capacity >>= 1;
2224 blk_queue_physical_block_size(sdp->request_queue,
2225 sdkp->physical_block_size);
2226 sdkp->device->sector_size = sector_size;
2229 /* called with buffer of length 512 */
2231 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2232 unsigned char *buffer, int len, struct scsi_mode_data *data,
2233 struct scsi_sense_hdr *sshdr)
2235 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2236 SD_TIMEOUT, SD_MAX_RETRIES, data,
2241 * read write protect setting, if possible - called only in sd_revalidate_disk()
2242 * called with buffer of length SD_BUF_SIZE
2245 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2248 struct scsi_device *sdp = sdkp->device;
2249 struct scsi_mode_data data;
2250 int old_wp = sdkp->write_prot;
2252 set_disk_ro(sdkp->disk, 0);
2253 if (sdp->skip_ms_page_3f) {
2254 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2258 if (sdp->use_192_bytes_for_3f) {
2259 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2262 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2263 * We have to start carefully: some devices hang if we ask
2264 * for more than is available.
2266 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2269 * Second attempt: ask for page 0 When only page 0 is
2270 * implemented, a request for page 3F may return Sense Key
2271 * 5: Illegal Request, Sense Code 24: Invalid field in
2274 if (!scsi_status_is_good(res))
2275 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2278 * Third attempt: ask 255 bytes, as we did earlier.
2280 if (!scsi_status_is_good(res))
2281 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2285 if (!scsi_status_is_good(res)) {
2286 sd_printk(KERN_WARNING, sdkp,
2287 "Test WP failed, assume Write Enabled\n");
2289 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2290 set_disk_ro(sdkp->disk, sdkp->write_prot);
2291 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2292 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2293 sdkp->write_prot ? "on" : "off");
2294 sd_printk(KERN_DEBUG, sdkp,
2295 "Mode Sense: %02x %02x %02x %02x\n",
2296 buffer[0], buffer[1], buffer[2], buffer[3]);
2302 * sd_read_cache_type - called only from sd_revalidate_disk()
2303 * called with buffer of length SD_BUF_SIZE
2306 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2309 struct scsi_device *sdp = sdkp->device;
2314 struct scsi_mode_data data;
2315 struct scsi_sense_hdr sshdr;
2316 int old_wce = sdkp->WCE;
2317 int old_rcd = sdkp->RCD;
2318 int old_dpofua = sdkp->DPOFUA;
2321 if (sdkp->cache_override)
2325 if (sdp->skip_ms_page_8) {
2326 if (sdp->type == TYPE_RBC)
2329 if (sdp->skip_ms_page_3f)
2332 if (sdp->use_192_bytes_for_3f)
2336 } else if (sdp->type == TYPE_RBC) {
2344 /* cautiously ask */
2345 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2348 if (!scsi_status_is_good(res))
2351 if (!data.header_length) {
2354 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2357 /* that went OK, now ask for the proper length */
2361 * We're only interested in the first three bytes, actually.
2362 * But the data cache page is defined for the first 20.
2366 else if (len > SD_BUF_SIZE) {
2367 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2368 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2371 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2375 if (len > first_len)
2376 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2379 if (scsi_status_is_good(res)) {
2380 int offset = data.header_length + data.block_descriptor_length;
2382 while (offset < len) {
2383 u8 page_code = buffer[offset] & 0x3F;
2384 u8 spf = buffer[offset] & 0x40;
2386 if (page_code == 8 || page_code == 6) {
2387 /* We're interested only in the first 3 bytes.
2389 if (len - offset <= 2) {
2390 sd_printk(KERN_ERR, sdkp, "Incomplete "
2391 "mode parameter data\n");
2394 modepage = page_code;
2398 /* Go to the next page */
2399 if (spf && len - offset > 3)
2400 offset += 4 + (buffer[offset+2] << 8) +
2402 else if (!spf && len - offset > 1)
2403 offset += 2 + buffer[offset+1];
2405 sd_printk(KERN_ERR, sdkp, "Incomplete "
2406 "mode parameter data\n");
2412 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2416 if (modepage == 8) {
2417 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2418 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2420 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2424 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2425 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2426 sd_printk(KERN_NOTICE, sdkp,
2427 "Uses READ/WRITE(6), disabling FUA\n");
2431 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2432 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2433 sd_printk(KERN_NOTICE, sdkp,
2434 "Write cache: %s, read cache: %s, %s\n",
2435 sdkp->WCE ? "enabled" : "disabled",
2436 sdkp->RCD ? "disabled" : "enabled",
2437 sdkp->DPOFUA ? "supports DPO and FUA"
2438 : "doesn't support DPO or FUA");
2444 if (scsi_sense_valid(&sshdr) &&
2445 sshdr.sense_key == ILLEGAL_REQUEST &&
2446 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2447 /* Invalid field in CDB */
2448 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2450 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2453 if (sdp->wce_default_on) {
2454 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2457 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2465 * The ATO bit indicates whether the DIF application tag is available
2466 * for use by the operating system.
2468 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2471 struct scsi_device *sdp = sdkp->device;
2472 struct scsi_mode_data data;
2473 struct scsi_sense_hdr sshdr;
2475 if (sdp->type != TYPE_DISK)
2478 if (sdkp->protection_type == 0)
2481 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2482 SD_MAX_RETRIES, &data, &sshdr);
2484 if (!scsi_status_is_good(res) || !data.header_length ||
2486 sd_printk(KERN_WARNING, sdkp,
2487 "getting Control mode page failed, assume no ATO\n");
2489 if (scsi_sense_valid(&sshdr))
2490 sd_print_sense_hdr(sdkp, &sshdr);
2495 offset = data.header_length + data.block_descriptor_length;
2497 if ((buffer[offset] & 0x3f) != 0x0a) {
2498 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2502 if ((buffer[offset + 5] & 0x80) == 0)
2511 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2512 * @disk: disk to query
2514 static void sd_read_block_limits(struct scsi_disk *sdkp)
2516 unsigned int sector_sz = sdkp->device->sector_size;
2517 const int vpd_len = 64;
2518 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2521 /* Block Limits VPD */
2522 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2525 blk_queue_io_min(sdkp->disk->queue,
2526 get_unaligned_be16(&buffer[6]) * sector_sz);
2527 blk_queue_io_opt(sdkp->disk->queue,
2528 get_unaligned_be32(&buffer[12]) * sector_sz);
2530 if (buffer[3] == 0x3c) {
2531 unsigned int lba_count, desc_count;
2533 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2538 lba_count = get_unaligned_be32(&buffer[20]);
2539 desc_count = get_unaligned_be32(&buffer[24]);
2541 if (lba_count && desc_count)
2542 sdkp->max_unmap_blocks = lba_count;
2544 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2546 if (buffer[32] & 0x80)
2547 sdkp->unmap_alignment =
2548 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2550 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2552 if (sdkp->max_unmap_blocks)
2553 sd_config_discard(sdkp, SD_LBP_UNMAP);
2555 sd_config_discard(sdkp, SD_LBP_WS16);
2557 } else { /* LBP VPD page tells us what to use */
2559 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2560 sd_config_discard(sdkp, SD_LBP_UNMAP);
2561 else if (sdkp->lbpws)
2562 sd_config_discard(sdkp, SD_LBP_WS16);
2563 else if (sdkp->lbpws10)
2564 sd_config_discard(sdkp, SD_LBP_WS10);
2566 sd_config_discard(sdkp, SD_LBP_DISABLE);
2575 * sd_read_block_characteristics - Query block dev. characteristics
2576 * @disk: disk to query
2578 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2580 unsigned char *buffer;
2582 const int vpd_len = 64;
2584 buffer = kmalloc(vpd_len, GFP_KERNEL);
2587 /* Block Device Characteristics VPD */
2588 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2591 rot = get_unaligned_be16(&buffer[4]);
2594 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2601 * sd_read_block_provisioning - Query provisioning VPD page
2602 * @disk: disk to query
2604 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2606 unsigned char *buffer;
2607 const int vpd_len = 8;
2609 if (sdkp->lbpme == 0)
2612 buffer = kmalloc(vpd_len, GFP_KERNEL);
2614 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2618 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2619 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2620 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2626 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2628 struct scsi_device *sdev = sdkp->device;
2630 if (sdev->host->no_write_same) {
2631 sdev->no_write_same = 1;
2636 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2637 /* too large values might cause issues with arcmsr */
2638 int vpd_buf_len = 64;
2640 sdev->no_report_opcodes = 1;
2642 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2643 * CODES is unsupported and the device has an ATA
2644 * Information VPD page (SAT).
2646 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2647 sdev->no_write_same = 1;
2650 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2653 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2657 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2660 * Although VPD inquiries can go to SCSI-2 type devices,
2661 * some USB ones crash on receiving them, and the pages
2662 * we currently ask for are for SPC-3 and beyond
2664 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2670 * sd_revalidate_disk - called the first time a new disk is seen,
2671 * performs disk spin up, read_capacity, etc.
2672 * @disk: struct gendisk we care about
2674 static int sd_revalidate_disk(struct gendisk *disk)
2676 struct scsi_disk *sdkp = scsi_disk(disk);
2677 struct scsi_device *sdp = sdkp->device;
2678 unsigned char *buffer;
2681 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2682 "sd_revalidate_disk\n"));
2685 * If the device is offline, don't try and read capacity or any
2686 * of the other niceties.
2688 if (!scsi_device_online(sdp))
2691 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2693 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2694 "allocation failure.\n");
2698 sd_spinup_disk(sdkp);
2701 * Without media there is no reason to ask; moreover, some devices
2702 * react badly if we do.
2704 if (sdkp->media_present) {
2705 sd_read_capacity(sdkp, buffer);
2707 if (sd_try_extended_inquiry(sdp)) {
2708 sd_read_block_provisioning(sdkp);
2709 sd_read_block_limits(sdkp);
2710 sd_read_block_characteristics(sdkp);
2713 sd_read_write_protect_flag(sdkp, buffer);
2714 sd_read_cache_type(sdkp, buffer);
2715 sd_read_app_tag_own(sdkp, buffer);
2716 sd_read_write_same(sdkp, buffer);
2719 sdkp->first_scan = 0;
2722 * We now have all cache related info, determine how we deal
2723 * with flush requests.
2731 blk_queue_flush(sdkp->disk->queue, flush);
2733 set_capacity(disk, sdkp->capacity);
2734 sd_config_write_same(sdkp);
2742 * sd_unlock_native_capacity - unlock native capacity
2743 * @disk: struct gendisk to set capacity for
2745 * Block layer calls this function if it detects that partitions
2746 * on @disk reach beyond the end of the device. If the SCSI host
2747 * implements ->unlock_native_capacity() method, it's invoked to
2748 * give it a chance to adjust the device capacity.
2751 * Defined by block layer. Might sleep.
2753 static void sd_unlock_native_capacity(struct gendisk *disk)
2755 struct scsi_device *sdev = scsi_disk(disk)->device;
2757 if (sdev->host->hostt->unlock_native_capacity)
2758 sdev->host->hostt->unlock_native_capacity(sdev);
2762 * sd_format_disk_name - format disk name
2763 * @prefix: name prefix - ie. "sd" for SCSI disks
2764 * @index: index of the disk to format name for
2765 * @buf: output buffer
2766 * @buflen: length of the output buffer
2768 * SCSI disk names starts at sda. The 26th device is sdz and the
2769 * 27th is sdaa. The last one for two lettered suffix is sdzz
2770 * which is followed by sdaaa.
2772 * This is basically 26 base counting with one extra 'nil' entry
2773 * at the beginning from the second digit on and can be
2774 * determined using similar method as 26 base conversion with the
2775 * index shifted -1 after each digit is computed.
2781 * 0 on success, -errno on failure.
2783 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2785 const int base = 'z' - 'a' + 1;
2786 char *begin = buf + strlen(prefix);
2787 char *end = buf + buflen;
2797 *--p = 'a' + (index % unit);
2798 index = (index / unit) - 1;
2799 } while (index >= 0);
2801 memmove(begin, p, end - p);
2802 memcpy(buf, prefix, strlen(prefix));
2808 * The asynchronous part of sd_probe
2810 static void sd_probe_async(void *data, async_cookie_t cookie)
2812 struct scsi_disk *sdkp = data;
2813 struct scsi_device *sdp;
2820 index = sdkp->index;
2821 dev = &sdp->sdev_gendev;
2823 gd->major = sd_major((index & 0xf0) >> 4);
2824 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2825 gd->minors = SD_MINORS;
2827 gd->fops = &sd_fops;
2828 gd->private_data = &sdkp->driver;
2829 gd->queue = sdkp->device->request_queue;
2831 /* defaults, until the device tells us otherwise */
2832 sdp->sector_size = 512;
2834 sdkp->media_present = 1;
2835 sdkp->write_prot = 0;
2836 sdkp->cache_override = 0;
2840 sdkp->first_scan = 1;
2841 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2843 sd_revalidate_disk(gd);
2845 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2846 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2848 gd->driverfs_dev = &sdp->sdev_gendev;
2849 gd->flags = GENHD_FL_EXT_DEVT;
2850 if (sdp->removable) {
2851 gd->flags |= GENHD_FL_REMOVABLE;
2852 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2855 blk_pm_runtime_init(sdp->request_queue, dev);
2858 sd_dif_config_host(sdkp);
2860 sd_revalidate_disk(gd);
2862 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2863 sdp->removable ? "removable " : "");
2864 scsi_autopm_put_device(sdp);
2865 put_device(&sdkp->dev);
2869 * sd_probe - called during driver initialization and whenever a
2870 * new scsi device is attached to the system. It is called once
2871 * for each scsi device (not just disks) present.
2872 * @dev: pointer to device object
2874 * Returns 0 if successful (or not interested in this scsi device
2875 * (e.g. scanner)); 1 when there is an error.
2877 * Note: this function is invoked from the scsi mid-level.
2878 * This function sets up the mapping between a given
2879 * <host,channel,id,lun> (found in sdp) and new device name
2880 * (e.g. /dev/sda). More precisely it is the block device major
2881 * and minor number that is chosen here.
2883 * Assume sd_probe is not re-entrant (for time being)
2884 * Also think about sd_probe() and sd_remove() running coincidentally.
2886 static int sd_probe(struct device *dev)
2888 struct scsi_device *sdp = to_scsi_device(dev);
2889 struct scsi_disk *sdkp;
2895 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2898 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2902 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2906 gd = alloc_disk(SD_MINORS);
2911 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2914 spin_lock(&sd_index_lock);
2915 error = ida_get_new(&sd_index_ida, &index);
2916 spin_unlock(&sd_index_lock);
2917 } while (error == -EAGAIN);
2920 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2924 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2926 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2927 goto out_free_index;
2931 sdkp->driver = &sd_template;
2933 sdkp->index = index;
2934 atomic_set(&sdkp->openers, 0);
2935 atomic_set(&sdkp->device->ioerr_cnt, 0);
2937 if (!sdp->request_queue->rq_timeout) {
2938 if (sdp->type != TYPE_MOD)
2939 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2941 blk_queue_rq_timeout(sdp->request_queue,
2945 device_initialize(&sdkp->dev);
2946 sdkp->dev.parent = dev;
2947 sdkp->dev.class = &sd_disk_class;
2948 dev_set_name(&sdkp->dev, dev_name(dev));
2950 if (device_add(&sdkp->dev))
2951 goto out_free_index;
2954 dev_set_drvdata(dev, sdkp);
2956 get_device(&sdkp->dev); /* prevent release before async_schedule */
2957 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2962 spin_lock(&sd_index_lock);
2963 ida_remove(&sd_index_ida, index);
2964 spin_unlock(&sd_index_lock);
2974 * sd_remove - called whenever a scsi disk (previously recognized by
2975 * sd_probe) is detached from the system. It is called (potentially
2976 * multiple times) during sd module unload.
2977 * @sdp: pointer to mid level scsi device object
2979 * Note: this function is invoked from the scsi mid-level.
2980 * This function potentially frees up a device name (e.g. /dev/sdc)
2981 * that could be re-used by a subsequent sd_probe().
2982 * This function is not called when the built-in sd driver is "exit-ed".
2984 static int sd_remove(struct device *dev)
2986 struct scsi_disk *sdkp;
2988 sdkp = dev_get_drvdata(dev);
2989 scsi_autopm_get_device(sdkp->device);
2991 async_synchronize_full_domain(&scsi_sd_probe_domain);
2992 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2993 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2994 device_del(&sdkp->dev);
2995 del_gendisk(sdkp->disk);
2998 mutex_lock(&sd_ref_mutex);
2999 dev_set_drvdata(dev, NULL);
3000 put_device(&sdkp->dev);
3001 mutex_unlock(&sd_ref_mutex);
3007 * scsi_disk_release - Called to free the scsi_disk structure
3008 * @dev: pointer to embedded class device
3010 * sd_ref_mutex must be held entering this routine. Because it is
3011 * called on last put, you should always use the scsi_disk_get()
3012 * scsi_disk_put() helpers which manipulate the semaphore directly
3013 * and never do a direct put_device.
3015 static void scsi_disk_release(struct device *dev)
3017 struct scsi_disk *sdkp = to_scsi_disk(dev);
3018 struct gendisk *disk = sdkp->disk;
3020 spin_lock(&sd_index_lock);
3021 ida_remove(&sd_index_ida, sdkp->index);
3022 spin_unlock(&sd_index_lock);
3024 disk->private_data = NULL;
3026 put_device(&sdkp->device->sdev_gendev);
3031 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3033 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3034 struct scsi_sense_hdr sshdr;
3035 struct scsi_device *sdp = sdkp->device;
3039 cmd[4] |= 1; /* START */
3041 if (sdp->start_stop_pwr_cond)
3042 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3044 if (!scsi_device_online(sdp))
3047 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3048 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3050 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3051 sd_print_result(sdkp, res);
3052 if (driver_byte(res) & DRIVER_SENSE)
3053 sd_print_sense_hdr(sdkp, &sshdr);
3060 * Send a SYNCHRONIZE CACHE instruction down to the device through
3061 * the normal SCSI command structure. Wait for the command to
3064 static void sd_shutdown(struct device *dev)
3066 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3069 return; /* this can happen */
3071 if (pm_runtime_suspended(dev))
3075 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3076 sd_sync_cache(sdkp);
3079 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3080 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3081 sd_start_stop_device(sdkp, 0);
3085 scsi_disk_put(sdkp);
3088 static int sd_suspend(struct device *dev)
3090 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3094 return 0; /* this can happen */
3097 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3098 ret = sd_sync_cache(sdkp);
3103 if (sdkp->device->manage_start_stop) {
3104 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3105 ret = sd_start_stop_device(sdkp, 0);
3109 scsi_disk_put(sdkp);
3113 static int sd_resume(struct device *dev)
3115 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3118 if (!sdkp->device->manage_start_stop)
3121 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3122 ret = sd_start_stop_device(sdkp, 1);
3125 scsi_disk_put(sdkp);
3130 * init_sd - entry point for this driver (both when built in or when
3133 * Note: this function registers this driver with the scsi mid-level.
3135 static int __init init_sd(void)
3137 int majors = 0, i, err;
3139 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3141 for (i = 0; i < SD_MAJORS; i++)
3142 if (register_blkdev(sd_major(i), "sd") == 0)
3148 err = class_register(&sd_disk_class);
3152 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3154 if (!sd_cdb_cache) {
3155 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3159 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3161 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3165 err = scsi_register_driver(&sd_template.gendrv);
3167 goto err_out_driver;
3172 mempool_destroy(sd_cdb_pool);
3175 kmem_cache_destroy(sd_cdb_cache);
3178 class_unregister(&sd_disk_class);
3180 for (i = 0; i < SD_MAJORS; i++)
3181 unregister_blkdev(sd_major(i), "sd");
3186 * exit_sd - exit point for this driver (when it is a module).
3188 * Note: this function unregisters this driver from the scsi mid-level.
3190 static void __exit exit_sd(void)
3194 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3196 scsi_unregister_driver(&sd_template.gendrv);
3197 mempool_destroy(sd_cdb_pool);
3198 kmem_cache_destroy(sd_cdb_cache);
3200 class_unregister(&sd_disk_class);
3202 for (i = 0; i < SD_MAJORS; i++)
3203 unregister_blkdev(sd_major(i), "sd");
3206 module_init(init_sd);
3207 module_exit(exit_sd);
3209 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3210 struct scsi_sense_hdr *sshdr)
3212 sd_printk(KERN_INFO, sdkp, " ");
3213 scsi_show_sense_hdr(sshdr);
3214 sd_printk(KERN_INFO, sdkp, " ");
3215 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3218 static void sd_print_result(struct scsi_disk *sdkp, int result)
3220 sd_printk(KERN_INFO, sdkp, " ");
3221 scsi_show_result(result);