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 if (rq->cmd_flags & REQ_DISCARD) {
832 free_page((unsigned long)rq->buffer);
838 * sd_prep_fn - build a scsi (read or write) command from
839 * information in the request structure.
840 * @SCpnt: pointer to mid-level's per scsi command structure that
841 * contains request and into which the scsi command is written
843 * Returns 1 if successful and 0 if error (or cannot be done now).
845 static int sd_prep_fn(struct request_queue *q, struct request *rq)
847 struct scsi_cmnd *SCpnt;
848 struct scsi_device *sdp = q->queuedata;
849 struct gendisk *disk = rq->rq_disk;
850 struct scsi_disk *sdkp;
851 sector_t block = blk_rq_pos(rq);
853 unsigned int this_count = blk_rq_sectors(rq);
855 unsigned char protect;
858 * Discard request come in as REQ_TYPE_FS but we turn them into
859 * block PC requests to make life easier.
861 if (rq->cmd_flags & REQ_DISCARD) {
862 ret = sd_setup_discard_cmnd(sdp, rq);
864 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
865 ret = sd_setup_write_same_cmnd(sdp, rq);
867 } else if (rq->cmd_flags & REQ_FLUSH) {
868 ret = scsi_setup_flush_cmnd(sdp, rq);
870 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
871 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
873 } else if (rq->cmd_type != REQ_TYPE_FS) {
877 ret = scsi_setup_fs_cmnd(sdp, rq);
878 if (ret != BLKPREP_OK)
881 sdkp = scsi_disk(disk);
883 /* from here on until we're complete, any goto out
884 * is used for a killable error condition */
887 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
888 "sd_prep_fn: block=%llu, "
890 (unsigned long long)block,
893 if (!sdp || !scsi_device_online(sdp) ||
894 block + blk_rq_sectors(rq) > get_capacity(disk)) {
895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
896 "Finishing %u sectors\n",
897 blk_rq_sectors(rq)));
898 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
899 "Retry with 0x%p\n", SCpnt));
905 * quietly refuse to do anything to a changed disc until
906 * the changed bit has been reset
908 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
913 * Some SD card readers can't handle multi-sector accesses which touch
914 * the last one or two hardware sectors. Split accesses as needed.
916 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
917 (sdp->sector_size / 512);
919 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
920 if (block < threshold) {
921 /* Access up to the threshold but not beyond */
922 this_count = threshold - block;
924 /* Access only a single hardware sector */
925 this_count = sdp->sector_size / 512;
929 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
930 (unsigned long long)block));
933 * If we have a 1K hardware sectorsize, prevent access to single
934 * 512 byte sectors. In theory we could handle this - in fact
935 * the scsi cdrom driver must be able to handle this because
936 * we typically use 1K blocksizes, and cdroms typically have
937 * 2K hardware sectorsizes. Of course, things are simpler
938 * with the cdrom, since it is read-only. For performance
939 * reasons, the filesystems should be able to handle this
940 * and not force the scsi disk driver to use bounce buffers
943 if (sdp->sector_size == 1024) {
944 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
945 scmd_printk(KERN_ERR, SCpnt,
946 "Bad block number requested\n");
950 this_count = this_count >> 1;
953 if (sdp->sector_size == 2048) {
954 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
955 scmd_printk(KERN_ERR, SCpnt,
956 "Bad block number requested\n");
960 this_count = this_count >> 2;
963 if (sdp->sector_size == 4096) {
964 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
965 scmd_printk(KERN_ERR, SCpnt,
966 "Bad block number requested\n");
970 this_count = this_count >> 3;
973 if (rq_data_dir(rq) == WRITE) {
974 if (!sdp->writeable) {
977 SCpnt->cmnd[0] = WRITE_6;
978 SCpnt->sc_data_direction = DMA_TO_DEVICE;
980 if (blk_integrity_rq(rq))
981 sd_dif_prepare(rq, block, sdp->sector_size);
983 } else if (rq_data_dir(rq) == READ) {
984 SCpnt->cmnd[0] = READ_6;
985 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
987 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
991 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
992 "%s %d/%u 512 byte blocks.\n",
993 (rq_data_dir(rq) == WRITE) ?
994 "writing" : "reading", this_count,
995 blk_rq_sectors(rq)));
997 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
998 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1004 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1005 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1007 if (unlikely(SCpnt->cmnd == NULL)) {
1008 ret = BLKPREP_DEFER;
1012 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1013 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1014 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1015 SCpnt->cmnd[7] = 0x18;
1016 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1017 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1020 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1021 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1022 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1023 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1024 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1025 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1026 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1027 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1029 /* Expected Indirect LBA */
1030 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1031 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1032 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1033 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1035 /* Transfer length */
1036 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1037 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1038 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1039 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1040 } else if (sdp->use_16_for_rw) {
1041 SCpnt->cmnd[0] += READ_16 - READ_6;
1042 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1043 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1044 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1045 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1046 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1047 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1048 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1049 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1050 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1051 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1052 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1053 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1054 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1055 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1056 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1057 scsi_device_protection(SCpnt->device) ||
1058 SCpnt->device->use_10_for_rw) {
1059 if (this_count > 0xffff)
1060 this_count = 0xffff;
1062 SCpnt->cmnd[0] += READ_10 - READ_6;
1063 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1064 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1065 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1066 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1067 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1068 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1069 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1070 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1072 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1074 * This happens only if this drive failed
1075 * 10byte rw command with ILLEGAL_REQUEST
1076 * during operation and thus turned off
1079 scmd_printk(KERN_ERR, SCpnt,
1080 "FUA write on READ/WRITE(6) drive\n");
1084 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1085 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1086 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1087 SCpnt->cmnd[4] = (unsigned char) this_count;
1090 SCpnt->sdb.length = this_count * sdp->sector_size;
1092 /* If DIF or DIX is enabled, tell HBA how to handle request */
1093 if (host_dif || scsi_prot_sg_count(SCpnt))
1094 sd_prot_op(SCpnt, host_dif);
1097 * We shouldn't disconnect in the middle of a sector, so with a dumb
1098 * host adapter, it's safe to assume that we can at least transfer
1099 * this many bytes between each connect / disconnect.
1101 SCpnt->transfersize = sdp->sector_size;
1102 SCpnt->underflow = this_count << 9;
1103 SCpnt->allowed = SD_MAX_RETRIES;
1106 * This indicates that the command is ready from our end to be
1111 return scsi_prep_return(q, rq, ret);
1115 * sd_open - open a scsi disk device
1116 * @inode: only i_rdev member may be used
1117 * @filp: only f_mode and f_flags may be used
1119 * Returns 0 if successful. Returns a negated errno value in case
1122 * Note: This can be called from a user context (e.g. fsck(1) )
1123 * or from within the kernel (e.g. as a result of a mount(1) ).
1124 * In the latter case @inode and @filp carry an abridged amount
1125 * of information as noted above.
1127 * Locking: called with bdev->bd_mutex held.
1129 static int sd_open(struct block_device *bdev, fmode_t mode)
1131 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1132 struct scsi_device *sdev;
1138 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1140 sdev = sdkp->device;
1143 * If the device is in error recovery, wait until it is done.
1144 * If the device is offline, then disallow any access to it.
1147 if (!scsi_block_when_processing_errors(sdev))
1150 if (sdev->removable || sdkp->write_prot)
1151 check_disk_change(bdev);
1154 * If the drive is empty, just let the open fail.
1156 retval = -ENOMEDIUM;
1157 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1161 * If the device has the write protect tab set, have the open fail
1162 * if the user expects to be able to write to the thing.
1165 if (sdkp->write_prot && (mode & FMODE_WRITE))
1169 * It is possible that the disk changing stuff resulted in
1170 * the device being taken offline. If this is the case,
1171 * report this to the user, and don't pretend that the
1172 * open actually succeeded.
1175 if (!scsi_device_online(sdev))
1178 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1179 if (scsi_block_when_processing_errors(sdev))
1180 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1186 scsi_disk_put(sdkp);
1191 * sd_release - invoked when the (last) close(2) is called on this
1193 * @inode: only i_rdev member may be used
1194 * @filp: only f_mode and f_flags may be used
1198 * Note: may block (uninterruptible) if error recovery is underway
1201 * Locking: called with bdev->bd_mutex held.
1203 static void sd_release(struct gendisk *disk, fmode_t mode)
1205 struct scsi_disk *sdkp = scsi_disk(disk);
1206 struct scsi_device *sdev = sdkp->device;
1208 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1210 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1211 if (scsi_block_when_processing_errors(sdev))
1212 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1216 * XXX and what if there are packets in flight and this close()
1217 * XXX is followed by a "rmmod sd_mod"?
1220 scsi_disk_put(sdkp);
1223 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1225 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1226 struct scsi_device *sdp = sdkp->device;
1227 struct Scsi_Host *host = sdp->host;
1230 /* default to most commonly used values */
1231 diskinfo[0] = 0x40; /* 1 << 6 */
1232 diskinfo[1] = 0x20; /* 1 << 5 */
1233 diskinfo[2] = sdkp->capacity >> 11;
1235 /* override with calculated, extended default, or driver values */
1236 if (host->hostt->bios_param)
1237 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1239 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1241 geo->heads = diskinfo[0];
1242 geo->sectors = diskinfo[1];
1243 geo->cylinders = diskinfo[2];
1248 * sd_ioctl - process an ioctl
1249 * @inode: only i_rdev/i_bdev members may be used
1250 * @filp: only f_mode and f_flags may be used
1251 * @cmd: ioctl command number
1252 * @arg: this is third argument given to ioctl(2) system call.
1253 * Often contains a pointer.
1255 * Returns 0 if successful (some ioctls return positive numbers on
1256 * success as well). Returns a negated errno value in case of error.
1258 * Note: most ioctls are forward onto the block subsystem or further
1259 * down in the scsi subsystem.
1261 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1262 unsigned int cmd, unsigned long arg)
1264 struct gendisk *disk = bdev->bd_disk;
1265 struct scsi_disk *sdkp = scsi_disk(disk);
1266 struct scsi_device *sdp = sdkp->device;
1267 void __user *p = (void __user *)arg;
1270 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1271 "cmd=0x%x\n", disk->disk_name, cmd));
1273 error = scsi_verify_blk_ioctl(bdev, cmd);
1278 * If we are in the middle of error recovery, don't let anyone
1279 * else try and use this device. Also, if error recovery fails, it
1280 * may try and take the device offline, in which case all further
1281 * access to the device is prohibited.
1283 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1284 (mode & FMODE_NDELAY) != 0);
1285 if (!scsi_block_when_processing_errors(sdp) || !error)
1289 * Send SCSI addressing ioctls directly to mid level, send other
1290 * ioctls to block level and then onto mid level if they can't be
1294 case SCSI_IOCTL_GET_IDLUN:
1295 case SCSI_IOCTL_GET_BUS_NUMBER:
1296 error = scsi_ioctl(sdp, cmd, p);
1299 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1300 if (error != -ENOTTY)
1302 error = scsi_ioctl(sdp, cmd, p);
1309 static void set_media_not_present(struct scsi_disk *sdkp)
1311 if (sdkp->media_present)
1312 sdkp->device->changed = 1;
1314 if (sdkp->device->removable) {
1315 sdkp->media_present = 0;
1320 static int media_not_present(struct scsi_disk *sdkp,
1321 struct scsi_sense_hdr *sshdr)
1323 if (!scsi_sense_valid(sshdr))
1326 /* not invoked for commands that could return deferred errors */
1327 switch (sshdr->sense_key) {
1328 case UNIT_ATTENTION:
1330 /* medium not present */
1331 if (sshdr->asc == 0x3A) {
1332 set_media_not_present(sdkp);
1340 * sd_check_events - check media events
1341 * @disk: kernel device descriptor
1342 * @clearing: disk events currently being cleared
1344 * Returns mask of DISK_EVENT_*.
1346 * Note: this function is invoked from the block subsystem.
1348 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1350 struct scsi_disk *sdkp = scsi_disk(disk);
1351 struct scsi_device *sdp = sdkp->device;
1352 struct scsi_sense_hdr *sshdr = NULL;
1355 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1358 * If the device is offline, don't send any commands - just pretend as
1359 * if the command failed. If the device ever comes back online, we
1360 * can deal with it then. It is only because of unrecoverable errors
1361 * that we would ever take a device offline in the first place.
1363 if (!scsi_device_online(sdp)) {
1364 set_media_not_present(sdkp);
1369 * Using TEST_UNIT_READY enables differentiation between drive with
1370 * no cartridge loaded - NOT READY, drive with changed cartridge -
1371 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1373 * Drives that auto spin down. eg iomega jaz 1G, will be started
1374 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1375 * sd_revalidate() is called.
1379 if (scsi_block_when_processing_errors(sdp)) {
1380 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1381 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1385 /* failed to execute TUR, assume media not present */
1386 if (host_byte(retval)) {
1387 set_media_not_present(sdkp);
1391 if (media_not_present(sdkp, sshdr))
1395 * For removable scsi disk we have to recognise the presence
1396 * of a disk in the drive.
1398 if (!sdkp->media_present)
1400 sdkp->media_present = 1;
1403 * sdp->changed is set under the following conditions:
1405 * Medium present state has changed in either direction.
1406 * Device has indicated UNIT_ATTENTION.
1409 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1414 static int sd_sync_cache(struct scsi_disk *sdkp)
1417 struct scsi_device *sdp = sdkp->device;
1418 struct scsi_sense_hdr sshdr;
1420 if (!scsi_device_online(sdp))
1424 for (retries = 3; retries > 0; --retries) {
1425 unsigned char cmd[10] = { 0 };
1427 cmd[0] = SYNCHRONIZE_CACHE;
1429 * Leave the rest of the command zero to indicate
1432 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1433 &sshdr, SD_FLUSH_TIMEOUT,
1434 SD_MAX_RETRIES, NULL, REQ_PM);
1440 sd_print_result(sdkp, res);
1441 if (driver_byte(res) & DRIVER_SENSE)
1442 sd_print_sense_hdr(sdkp, &sshdr);
1450 static void sd_rescan(struct device *dev)
1452 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1455 revalidate_disk(sdkp->disk);
1456 scsi_disk_put(sdkp);
1461 #ifdef CONFIG_COMPAT
1463 * This gets directly called from VFS. When the ioctl
1464 * is not recognized we go back to the other translation paths.
1466 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1467 unsigned int cmd, unsigned long arg)
1469 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1472 ret = scsi_verify_blk_ioctl(bdev, cmd);
1477 * If we are in the middle of error recovery, don't let anyone
1478 * else try and use this device. Also, if error recovery fails, it
1479 * may try and take the device offline, in which case all further
1480 * access to the device is prohibited.
1482 if (!scsi_block_when_processing_errors(sdev))
1485 if (sdev->host->hostt->compat_ioctl) {
1486 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1492 * Let the static ioctl translation table take care of it.
1494 return -ENOIOCTLCMD;
1498 static const struct block_device_operations sd_fops = {
1499 .owner = THIS_MODULE,
1501 .release = sd_release,
1503 .getgeo = sd_getgeo,
1504 #ifdef CONFIG_COMPAT
1505 .compat_ioctl = sd_compat_ioctl,
1507 .check_events = sd_check_events,
1508 .revalidate_disk = sd_revalidate_disk,
1509 .unlock_native_capacity = sd_unlock_native_capacity,
1513 * sd_eh_action - error handling callback
1514 * @scmd: sd-issued command that has failed
1515 * @eh_cmnd: The command that was sent during error handling
1516 * @eh_cmnd_len: Length of eh_cmnd in bytes
1517 * @eh_disp: The recovery disposition suggested by the midlayer
1519 * This function is called by the SCSI midlayer upon completion of
1520 * an error handling command (TEST UNIT READY, START STOP UNIT,
1521 * etc.) The command sent to the device by the error handler is
1522 * stored in eh_cmnd. The result of sending the eh command is
1523 * passed in eh_disp.
1525 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1526 int eh_cmnd_len, int eh_disp)
1528 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1530 if (!scsi_device_online(scmd->device) ||
1531 !scsi_medium_access_command(scmd))
1535 * The device has timed out executing a medium access command.
1536 * However, the TEST UNIT READY command sent during error
1537 * handling completed successfully. Either the device is in the
1538 * process of recovering or has it suffered an internal failure
1539 * that prevents access to the storage medium.
1541 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1542 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1543 sdkp->medium_access_timed_out++;
1546 * If the device keeps failing read/write commands but TEST UNIT
1547 * READY always completes successfully we assume that medium
1548 * access is no longer possible and take the device offline.
1550 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1551 scmd_printk(KERN_ERR, scmd,
1552 "Medium access timeout failure. Offlining disk!\n");
1553 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1561 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1563 u64 start_lba = blk_rq_pos(scmd->request);
1564 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1568 * resid is optional but mostly filled in. When it's unused,
1569 * its value is zero, so we assume the whole buffer transferred
1571 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1572 unsigned int good_bytes;
1574 if (scmd->request->cmd_type != REQ_TYPE_FS)
1577 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1578 SCSI_SENSE_BUFFERSIZE,
1583 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1586 if (scmd->device->sector_size < 512) {
1587 /* only legitimate sector_size here is 256 */
1591 /* be careful ... don't want any overflows */
1592 u64 factor = scmd->device->sector_size / 512;
1593 do_div(start_lba, factor);
1594 do_div(end_lba, factor);
1597 /* The bad lba was reported incorrectly, we have no idea where
1600 if (bad_lba < start_lba || bad_lba >= end_lba)
1603 /* This computation should always be done in terms of
1604 * the resolution of the device's medium.
1606 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1607 return min(good_bytes, transferred);
1611 * sd_done - bottom half handler: called when the lower level
1612 * driver has completed (successfully or otherwise) a scsi command.
1613 * @SCpnt: mid-level's per command structure.
1615 * Note: potentially run from within an ISR. Must not block.
1617 static int sd_done(struct scsi_cmnd *SCpnt)
1619 int result = SCpnt->result;
1620 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1621 struct scsi_sense_hdr sshdr;
1622 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1623 struct request *req = SCpnt->request;
1624 int sense_valid = 0;
1625 int sense_deferred = 0;
1626 unsigned char op = SCpnt->cmnd[0];
1627 unsigned char unmap = SCpnt->cmnd[1] & 8;
1629 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1631 good_bytes = blk_rq_bytes(req);
1632 scsi_set_resid(SCpnt, 0);
1635 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1640 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1642 sense_deferred = scsi_sense_is_deferred(&sshdr);
1644 #ifdef CONFIG_SCSI_LOGGING
1645 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1647 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1648 "sd_done: sb[respc,sk,asc,"
1649 "ascq]=%x,%x,%x,%x\n",
1650 sshdr.response_code,
1651 sshdr.sense_key, sshdr.asc,
1655 if (driver_byte(result) != DRIVER_SENSE &&
1656 (!sense_valid || sense_deferred))
1659 sdkp->medium_access_timed_out = 0;
1661 switch (sshdr.sense_key) {
1662 case HARDWARE_ERROR:
1664 good_bytes = sd_completed_bytes(SCpnt);
1666 case RECOVERED_ERROR:
1667 good_bytes = scsi_bufflen(SCpnt);
1670 /* This indicates a false check condition, so ignore it. An
1671 * unknown amount of data was transferred so treat it as an
1674 scsi_print_sense("sd", SCpnt);
1676 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1678 case ABORTED_COMMAND:
1679 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1680 good_bytes = sd_completed_bytes(SCpnt);
1682 case ILLEGAL_REQUEST:
1683 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1684 good_bytes = sd_completed_bytes(SCpnt);
1685 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1686 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1689 sd_config_discard(sdkp, SD_LBP_DISABLE);
1694 sd_config_discard(sdkp, SD_LBP_DISABLE);
1696 sdkp->device->no_write_same = 1;
1697 sd_config_write_same(sdkp);
1700 req->__data_len = blk_rq_bytes(req);
1701 req->cmd_flags |= REQ_QUIET;
1710 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1711 sd_dif_complete(SCpnt, good_bytes);
1713 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1714 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1716 /* We have to print a failed command here as the
1717 * extended CDB gets freed before scsi_io_completion()
1721 scsi_print_command(SCpnt);
1723 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1732 * spinup disk - called only in sd_revalidate_disk()
1735 sd_spinup_disk(struct scsi_disk *sdkp)
1737 unsigned char cmd[10];
1738 unsigned long spintime_expire = 0;
1739 int retries, spintime;
1740 unsigned int the_result;
1741 struct scsi_sense_hdr sshdr;
1742 int sense_valid = 0;
1746 /* Spin up drives, as required. Only do this at boot time */
1747 /* Spinup needs to be done for module loads too. */
1752 cmd[0] = TEST_UNIT_READY;
1753 memset((void *) &cmd[1], 0, 9);
1755 the_result = scsi_execute_req(sdkp->device, cmd,
1758 SD_MAX_RETRIES, NULL);
1761 * If the drive has indicated to us that it
1762 * doesn't have any media in it, don't bother
1763 * with any more polling.
1765 if (media_not_present(sdkp, &sshdr))
1769 sense_valid = scsi_sense_valid(&sshdr);
1771 } while (retries < 3 &&
1772 (!scsi_status_is_good(the_result) ||
1773 ((driver_byte(the_result) & DRIVER_SENSE) &&
1774 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1776 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1777 /* no sense, TUR either succeeded or failed
1778 * with a status error */
1779 if(!spintime && !scsi_status_is_good(the_result)) {
1780 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1781 sd_print_result(sdkp, the_result);
1787 * The device does not want the automatic start to be issued.
1789 if (sdkp->device->no_start_on_add)
1792 if (sense_valid && sshdr.sense_key == NOT_READY) {
1793 if (sshdr.asc == 4 && sshdr.ascq == 3)
1794 break; /* manual intervention required */
1795 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1796 break; /* standby */
1797 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1798 break; /* unavailable */
1800 * Issue command to spin up drive when not ready
1803 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1804 cmd[0] = START_STOP;
1805 cmd[1] = 1; /* Return immediately */
1806 memset((void *) &cmd[2], 0, 8);
1807 cmd[4] = 1; /* Start spin cycle */
1808 if (sdkp->device->start_stop_pwr_cond)
1810 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1812 SD_TIMEOUT, SD_MAX_RETRIES,
1814 spintime_expire = jiffies + 100 * HZ;
1817 /* Wait 1 second for next try */
1822 * Wait for USB flash devices with slow firmware.
1823 * Yes, this sense key/ASC combination shouldn't
1824 * occur here. It's characteristic of these devices.
1826 } else if (sense_valid &&
1827 sshdr.sense_key == UNIT_ATTENTION &&
1828 sshdr.asc == 0x28) {
1830 spintime_expire = jiffies + 5 * HZ;
1833 /* Wait 1 second for next try */
1836 /* we don't understand the sense code, so it's
1837 * probably pointless to loop */
1839 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1840 sd_print_sense_hdr(sdkp, &sshdr);
1845 } while (spintime && time_before_eq(jiffies, spintime_expire));
1848 if (scsi_status_is_good(the_result))
1851 printk("not responding...\n");
1857 * Determine whether disk supports Data Integrity Field.
1859 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1861 struct scsi_device *sdp = sdkp->device;
1865 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1868 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1870 if (type > SD_DIF_TYPE3_PROTECTION)
1872 else if (scsi_host_dif_capable(sdp->host, type))
1875 if (sdkp->first_scan || type != sdkp->protection_type)
1878 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1879 " protection type %u. Disabling disk!\n",
1883 sd_printk(KERN_NOTICE, sdkp,
1884 "Enabling DIF Type %u protection\n", type);
1887 sd_printk(KERN_NOTICE, sdkp,
1888 "Disabling DIF Type %u protection\n", type);
1892 sdkp->protection_type = type;
1897 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1898 struct scsi_sense_hdr *sshdr, int sense_valid,
1901 sd_print_result(sdkp, the_result);
1902 if (driver_byte(the_result) & DRIVER_SENSE)
1903 sd_print_sense_hdr(sdkp, sshdr);
1905 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1908 * Set dirty bit for removable devices if not ready -
1909 * sometimes drives will not report this properly.
1911 if (sdp->removable &&
1912 sense_valid && sshdr->sense_key == NOT_READY)
1913 set_media_not_present(sdkp);
1916 * We used to set media_present to 0 here to indicate no media
1917 * in the drive, but some drives fail read capacity even with
1918 * media present, so we can't do that.
1920 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1924 #if RC16_LEN > SD_BUF_SIZE
1925 #error RC16_LEN must not be more than SD_BUF_SIZE
1928 #define READ_CAPACITY_RETRIES_ON_RESET 10
1930 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1931 unsigned char *buffer)
1933 unsigned char cmd[16];
1934 struct scsi_sense_hdr sshdr;
1935 int sense_valid = 0;
1937 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1938 unsigned int alignment;
1939 unsigned long long lba;
1940 unsigned sector_size;
1942 if (sdp->no_read_capacity_16)
1947 cmd[0] = SERVICE_ACTION_IN;
1948 cmd[1] = SAI_READ_CAPACITY_16;
1950 memset(buffer, 0, RC16_LEN);
1952 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1953 buffer, RC16_LEN, &sshdr,
1954 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1956 if (media_not_present(sdkp, &sshdr))
1960 sense_valid = scsi_sense_valid(&sshdr);
1962 sshdr.sense_key == ILLEGAL_REQUEST &&
1963 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1965 /* Invalid Command Operation Code or
1966 * Invalid Field in CDB, just retry
1967 * silently with RC10 */
1970 sshdr.sense_key == UNIT_ATTENTION &&
1971 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1972 /* Device reset might occur several times,
1973 * give it one more chance */
1974 if (--reset_retries > 0)
1979 } while (the_result && retries);
1982 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1983 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1987 sector_size = get_unaligned_be32(&buffer[8]);
1988 lba = get_unaligned_be64(&buffer[0]);
1990 if (sd_read_protection_type(sdkp, buffer) < 0) {
1995 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1996 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1997 "kernel compiled with support for large block "
2003 /* Logical blocks per physical block exponent */
2004 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2006 /* Lowest aligned logical block */
2007 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2008 blk_queue_alignment_offset(sdp->request_queue, alignment);
2009 if (alignment && sdkp->first_scan)
2010 sd_printk(KERN_NOTICE, sdkp,
2011 "physical block alignment offset: %u\n", alignment);
2013 if (buffer[14] & 0x80) { /* LBPME */
2016 if (buffer[14] & 0x40) /* LBPRZ */
2019 sd_config_discard(sdkp, SD_LBP_WS16);
2022 sdkp->capacity = lba + 1;
2026 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2027 unsigned char *buffer)
2029 unsigned char cmd[16];
2030 struct scsi_sense_hdr sshdr;
2031 int sense_valid = 0;
2033 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2035 unsigned sector_size;
2038 cmd[0] = READ_CAPACITY;
2039 memset(&cmd[1], 0, 9);
2040 memset(buffer, 0, 8);
2042 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2044 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2046 if (media_not_present(sdkp, &sshdr))
2050 sense_valid = scsi_sense_valid(&sshdr);
2052 sshdr.sense_key == UNIT_ATTENTION &&
2053 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2054 /* Device reset might occur several times,
2055 * give it one more chance */
2056 if (--reset_retries > 0)
2061 } while (the_result && retries);
2064 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2065 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2069 sector_size = get_unaligned_be32(&buffer[4]);
2070 lba = get_unaligned_be32(&buffer[0]);
2072 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2073 /* Some buggy (usb cardreader) devices return an lba of
2074 0xffffffff when the want to report a size of 0 (with
2075 which they really mean no media is present) */
2077 sdkp->physical_block_size = sector_size;
2081 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2082 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2083 "kernel compiled with support for large block "
2089 sdkp->capacity = lba + 1;
2090 sdkp->physical_block_size = sector_size;
2094 static int sd_try_rc16_first(struct scsi_device *sdp)
2096 if (sdp->host->max_cmd_len < 16)
2098 if (sdp->try_rc_10_first)
2100 if (sdp->scsi_level > SCSI_SPC_2)
2102 if (scsi_device_protection(sdp))
2108 * read disk capacity
2111 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2114 struct scsi_device *sdp = sdkp->device;
2115 sector_t old_capacity = sdkp->capacity;
2117 if (sd_try_rc16_first(sdp)) {
2118 sector_size = read_capacity_16(sdkp, sdp, buffer);
2119 if (sector_size == -EOVERFLOW)
2121 if (sector_size == -ENODEV)
2123 if (sector_size < 0)
2124 sector_size = read_capacity_10(sdkp, sdp, buffer);
2125 if (sector_size < 0)
2128 sector_size = read_capacity_10(sdkp, sdp, buffer);
2129 if (sector_size == -EOVERFLOW)
2131 if (sector_size < 0)
2133 if ((sizeof(sdkp->capacity) > 4) &&
2134 (sdkp->capacity > 0xffffffffULL)) {
2135 int old_sector_size = sector_size;
2136 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2137 "Trying to use READ CAPACITY(16).\n");
2138 sector_size = read_capacity_16(sdkp, sdp, buffer);
2139 if (sector_size < 0) {
2140 sd_printk(KERN_NOTICE, sdkp,
2141 "Using 0xffffffff as device size\n");
2142 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2143 sector_size = old_sector_size;
2149 /* Some devices are known to return the total number of blocks,
2150 * not the highest block number. Some devices have versions
2151 * which do this and others which do not. Some devices we might
2152 * suspect of doing this but we don't know for certain.
2154 * If we know the reported capacity is wrong, decrement it. If
2155 * we can only guess, then assume the number of blocks is even
2156 * (usually true but not always) and err on the side of lowering
2159 if (sdp->fix_capacity ||
2160 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2161 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2162 "from its reported value: %llu\n",
2163 (unsigned long long) sdkp->capacity);
2168 if (sector_size == 0) {
2170 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2174 if (sector_size != 512 &&
2175 sector_size != 1024 &&
2176 sector_size != 2048 &&
2177 sector_size != 4096 &&
2178 sector_size != 256) {
2179 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2182 * The user might want to re-format the drive with
2183 * a supported sectorsize. Once this happens, it
2184 * would be relatively trivial to set the thing up.
2185 * For this reason, we leave the thing in the table.
2189 * set a bogus sector size so the normal read/write
2190 * logic in the block layer will eventually refuse any
2191 * request on this device without tripping over power
2192 * of two sector size assumptions
2196 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2199 char cap_str_2[10], cap_str_10[10];
2200 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2202 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2204 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2205 sizeof(cap_str_10));
2207 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2208 sd_printk(KERN_NOTICE, sdkp,
2209 "%llu %d-byte logical blocks: (%s/%s)\n",
2210 (unsigned long long)sdkp->capacity,
2211 sector_size, cap_str_10, cap_str_2);
2213 if (sdkp->physical_block_size != sector_size)
2214 sd_printk(KERN_NOTICE, sdkp,
2215 "%u-byte physical blocks\n",
2216 sdkp->physical_block_size);
2220 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2222 /* Rescale capacity to 512-byte units */
2223 if (sector_size == 4096)
2224 sdkp->capacity <<= 3;
2225 else if (sector_size == 2048)
2226 sdkp->capacity <<= 2;
2227 else if (sector_size == 1024)
2228 sdkp->capacity <<= 1;
2229 else if (sector_size == 256)
2230 sdkp->capacity >>= 1;
2232 blk_queue_physical_block_size(sdp->request_queue,
2233 sdkp->physical_block_size);
2234 sdkp->device->sector_size = sector_size;
2237 /* called with buffer of length 512 */
2239 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2240 unsigned char *buffer, int len, struct scsi_mode_data *data,
2241 struct scsi_sense_hdr *sshdr)
2243 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2244 SD_TIMEOUT, SD_MAX_RETRIES, data,
2249 * read write protect setting, if possible - called only in sd_revalidate_disk()
2250 * called with buffer of length SD_BUF_SIZE
2253 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2256 struct scsi_device *sdp = sdkp->device;
2257 struct scsi_mode_data data;
2258 int old_wp = sdkp->write_prot;
2260 set_disk_ro(sdkp->disk, 0);
2261 if (sdp->skip_ms_page_3f) {
2262 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2266 if (sdp->use_192_bytes_for_3f) {
2267 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2270 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2271 * We have to start carefully: some devices hang if we ask
2272 * for more than is available.
2274 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2277 * Second attempt: ask for page 0 When only page 0 is
2278 * implemented, a request for page 3F may return Sense Key
2279 * 5: Illegal Request, Sense Code 24: Invalid field in
2282 if (!scsi_status_is_good(res))
2283 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2286 * Third attempt: ask 255 bytes, as we did earlier.
2288 if (!scsi_status_is_good(res))
2289 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2293 if (!scsi_status_is_good(res)) {
2294 sd_printk(KERN_WARNING, sdkp,
2295 "Test WP failed, assume Write Enabled\n");
2297 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2298 set_disk_ro(sdkp->disk, sdkp->write_prot);
2299 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2300 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2301 sdkp->write_prot ? "on" : "off");
2302 sd_printk(KERN_DEBUG, sdkp,
2303 "Mode Sense: %02x %02x %02x %02x\n",
2304 buffer[0], buffer[1], buffer[2], buffer[3]);
2310 * sd_read_cache_type - called only from sd_revalidate_disk()
2311 * called with buffer of length SD_BUF_SIZE
2314 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2317 struct scsi_device *sdp = sdkp->device;
2322 struct scsi_mode_data data;
2323 struct scsi_sense_hdr sshdr;
2324 int old_wce = sdkp->WCE;
2325 int old_rcd = sdkp->RCD;
2326 int old_dpofua = sdkp->DPOFUA;
2329 if (sdkp->cache_override)
2333 if (sdp->skip_ms_page_8) {
2334 if (sdp->type == TYPE_RBC)
2337 if (sdp->skip_ms_page_3f)
2340 if (sdp->use_192_bytes_for_3f)
2344 } else if (sdp->type == TYPE_RBC) {
2352 /* cautiously ask */
2353 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2356 if (!scsi_status_is_good(res))
2359 if (!data.header_length) {
2362 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2365 /* that went OK, now ask for the proper length */
2369 * We're only interested in the first three bytes, actually.
2370 * But the data cache page is defined for the first 20.
2374 else if (len > SD_BUF_SIZE) {
2375 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2376 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2379 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2383 if (len > first_len)
2384 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2387 if (scsi_status_is_good(res)) {
2388 int offset = data.header_length + data.block_descriptor_length;
2390 while (offset < len) {
2391 u8 page_code = buffer[offset] & 0x3F;
2392 u8 spf = buffer[offset] & 0x40;
2394 if (page_code == 8 || page_code == 6) {
2395 /* We're interested only in the first 3 bytes.
2397 if (len - offset <= 2) {
2398 sd_printk(KERN_ERR, sdkp, "Incomplete "
2399 "mode parameter data\n");
2402 modepage = page_code;
2406 /* Go to the next page */
2407 if (spf && len - offset > 3)
2408 offset += 4 + (buffer[offset+2] << 8) +
2410 else if (!spf && len - offset > 1)
2411 offset += 2 + buffer[offset+1];
2413 sd_printk(KERN_ERR, sdkp, "Incomplete "
2414 "mode parameter data\n");
2420 if (modepage == 0x3F) {
2421 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2424 } else if ((buffer[offset] & 0x3f) != modepage) {
2425 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2429 if (modepage == 8) {
2430 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2431 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2433 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2437 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2438 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2439 sd_printk(KERN_NOTICE, sdkp,
2440 "Uses READ/WRITE(6), disabling FUA\n");
2444 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2445 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2446 sd_printk(KERN_NOTICE, sdkp,
2447 "Write cache: %s, read cache: %s, %s\n",
2448 sdkp->WCE ? "enabled" : "disabled",
2449 sdkp->RCD ? "disabled" : "enabled",
2450 sdkp->DPOFUA ? "supports DPO and FUA"
2451 : "doesn't support DPO or FUA");
2457 if (scsi_sense_valid(&sshdr) &&
2458 sshdr.sense_key == ILLEGAL_REQUEST &&
2459 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2460 /* Invalid field in CDB */
2461 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2463 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2466 if (sdp->wce_default_on) {
2467 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2470 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2478 * The ATO bit indicates whether the DIF application tag is available
2479 * for use by the operating system.
2481 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2484 struct scsi_device *sdp = sdkp->device;
2485 struct scsi_mode_data data;
2486 struct scsi_sense_hdr sshdr;
2488 if (sdp->type != TYPE_DISK)
2491 if (sdkp->protection_type == 0)
2494 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2495 SD_MAX_RETRIES, &data, &sshdr);
2497 if (!scsi_status_is_good(res) || !data.header_length ||
2499 sd_printk(KERN_WARNING, sdkp,
2500 "getting Control mode page failed, assume no ATO\n");
2502 if (scsi_sense_valid(&sshdr))
2503 sd_print_sense_hdr(sdkp, &sshdr);
2508 offset = data.header_length + data.block_descriptor_length;
2510 if ((buffer[offset] & 0x3f) != 0x0a) {
2511 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2515 if ((buffer[offset + 5] & 0x80) == 0)
2524 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2525 * @disk: disk to query
2527 static void sd_read_block_limits(struct scsi_disk *sdkp)
2529 unsigned int sector_sz = sdkp->device->sector_size;
2530 const int vpd_len = 64;
2531 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2534 /* Block Limits VPD */
2535 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2538 blk_queue_io_min(sdkp->disk->queue,
2539 get_unaligned_be16(&buffer[6]) * sector_sz);
2540 blk_queue_io_opt(sdkp->disk->queue,
2541 get_unaligned_be32(&buffer[12]) * sector_sz);
2543 if (buffer[3] == 0x3c) {
2544 unsigned int lba_count, desc_count;
2546 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2551 lba_count = get_unaligned_be32(&buffer[20]);
2552 desc_count = get_unaligned_be32(&buffer[24]);
2554 if (lba_count && desc_count)
2555 sdkp->max_unmap_blocks = lba_count;
2557 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2559 if (buffer[32] & 0x80)
2560 sdkp->unmap_alignment =
2561 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2563 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2565 if (sdkp->max_unmap_blocks)
2566 sd_config_discard(sdkp, SD_LBP_UNMAP);
2568 sd_config_discard(sdkp, SD_LBP_WS16);
2570 } else { /* LBP VPD page tells us what to use */
2572 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2573 sd_config_discard(sdkp, SD_LBP_UNMAP);
2574 else if (sdkp->lbpws)
2575 sd_config_discard(sdkp, SD_LBP_WS16);
2576 else if (sdkp->lbpws10)
2577 sd_config_discard(sdkp, SD_LBP_WS10);
2579 sd_config_discard(sdkp, SD_LBP_DISABLE);
2588 * sd_read_block_characteristics - Query block dev. characteristics
2589 * @disk: disk to query
2591 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2593 unsigned char *buffer;
2595 const int vpd_len = 64;
2597 buffer = kmalloc(vpd_len, GFP_KERNEL);
2600 /* Block Device Characteristics VPD */
2601 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2604 rot = get_unaligned_be16(&buffer[4]);
2607 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2614 * sd_read_block_provisioning - Query provisioning VPD page
2615 * @disk: disk to query
2617 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2619 unsigned char *buffer;
2620 const int vpd_len = 8;
2622 if (sdkp->lbpme == 0)
2625 buffer = kmalloc(vpd_len, GFP_KERNEL);
2627 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2631 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2632 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2633 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2639 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2641 struct scsi_device *sdev = sdkp->device;
2643 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2644 sdev->no_report_opcodes = 1;
2646 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2647 * CODES is unsupported and the device has an ATA
2648 * Information VPD page (SAT).
2650 if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
2651 sdev->no_write_same = 1;
2654 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2657 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2661 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2664 * Although VPD inquiries can go to SCSI-2 type devices,
2665 * some USB ones crash on receiving them, and the pages
2666 * we currently ask for are for SPC-3 and beyond
2668 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2674 * sd_revalidate_disk - called the first time a new disk is seen,
2675 * performs disk spin up, read_capacity, etc.
2676 * @disk: struct gendisk we care about
2678 static int sd_revalidate_disk(struct gendisk *disk)
2680 struct scsi_disk *sdkp = scsi_disk(disk);
2681 struct scsi_device *sdp = sdkp->device;
2682 unsigned char *buffer;
2685 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2686 "sd_revalidate_disk\n"));
2689 * If the device is offline, don't try and read capacity or any
2690 * of the other niceties.
2692 if (!scsi_device_online(sdp))
2695 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2697 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2698 "allocation failure.\n");
2702 sd_spinup_disk(sdkp);
2705 * Without media there is no reason to ask; moreover, some devices
2706 * react badly if we do.
2708 if (sdkp->media_present) {
2709 sd_read_capacity(sdkp, buffer);
2711 if (sd_try_extended_inquiry(sdp)) {
2712 sd_read_block_provisioning(sdkp);
2713 sd_read_block_limits(sdkp);
2714 sd_read_block_characteristics(sdkp);
2717 sd_read_write_protect_flag(sdkp, buffer);
2718 sd_read_cache_type(sdkp, buffer);
2719 sd_read_app_tag_own(sdkp, buffer);
2720 sd_read_write_same(sdkp, buffer);
2723 sdkp->first_scan = 0;
2726 * We now have all cache related info, determine how we deal
2727 * with flush requests.
2735 blk_queue_flush(sdkp->disk->queue, flush);
2737 set_capacity(disk, sdkp->capacity);
2738 sd_config_write_same(sdkp);
2746 * sd_unlock_native_capacity - unlock native capacity
2747 * @disk: struct gendisk to set capacity for
2749 * Block layer calls this function if it detects that partitions
2750 * on @disk reach beyond the end of the device. If the SCSI host
2751 * implements ->unlock_native_capacity() method, it's invoked to
2752 * give it a chance to adjust the device capacity.
2755 * Defined by block layer. Might sleep.
2757 static void sd_unlock_native_capacity(struct gendisk *disk)
2759 struct scsi_device *sdev = scsi_disk(disk)->device;
2761 if (sdev->host->hostt->unlock_native_capacity)
2762 sdev->host->hostt->unlock_native_capacity(sdev);
2766 * sd_format_disk_name - format disk name
2767 * @prefix: name prefix - ie. "sd" for SCSI disks
2768 * @index: index of the disk to format name for
2769 * @buf: output buffer
2770 * @buflen: length of the output buffer
2772 * SCSI disk names starts at sda. The 26th device is sdz and the
2773 * 27th is sdaa. The last one for two lettered suffix is sdzz
2774 * which is followed by sdaaa.
2776 * This is basically 26 base counting with one extra 'nil' entry
2777 * at the beginning from the second digit on and can be
2778 * determined using similar method as 26 base conversion with the
2779 * index shifted -1 after each digit is computed.
2785 * 0 on success, -errno on failure.
2787 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2789 const int base = 'z' - 'a' + 1;
2790 char *begin = buf + strlen(prefix);
2791 char *end = buf + buflen;
2801 *--p = 'a' + (index % unit);
2802 index = (index / unit) - 1;
2803 } while (index >= 0);
2805 memmove(begin, p, end - p);
2806 memcpy(buf, prefix, strlen(prefix));
2812 * The asynchronous part of sd_probe
2814 static void sd_probe_async(void *data, async_cookie_t cookie)
2816 struct scsi_disk *sdkp = data;
2817 struct scsi_device *sdp;
2824 index = sdkp->index;
2825 dev = &sdp->sdev_gendev;
2827 gd->major = sd_major((index & 0xf0) >> 4);
2828 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2829 gd->minors = SD_MINORS;
2831 gd->fops = &sd_fops;
2832 gd->private_data = &sdkp->driver;
2833 gd->queue = sdkp->device->request_queue;
2835 /* defaults, until the device tells us otherwise */
2836 sdp->sector_size = 512;
2838 sdkp->media_present = 1;
2839 sdkp->write_prot = 0;
2840 sdkp->cache_override = 0;
2844 sdkp->first_scan = 1;
2845 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2847 sd_revalidate_disk(gd);
2849 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2850 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2852 gd->driverfs_dev = &sdp->sdev_gendev;
2853 gd->flags = GENHD_FL_EXT_DEVT;
2854 if (sdp->removable) {
2855 gd->flags |= GENHD_FL_REMOVABLE;
2856 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2861 sd_dif_config_host(sdkp);
2863 sd_revalidate_disk(gd);
2865 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2866 sdp->removable ? "removable " : "");
2867 blk_pm_runtime_init(sdp->request_queue, dev);
2868 scsi_autopm_put_device(sdp);
2869 put_device(&sdkp->dev);
2873 * sd_probe - called during driver initialization and whenever a
2874 * new scsi device is attached to the system. It is called once
2875 * for each scsi device (not just disks) present.
2876 * @dev: pointer to device object
2878 * Returns 0 if successful (or not interested in this scsi device
2879 * (e.g. scanner)); 1 when there is an error.
2881 * Note: this function is invoked from the scsi mid-level.
2882 * This function sets up the mapping between a given
2883 * <host,channel,id,lun> (found in sdp) and new device name
2884 * (e.g. /dev/sda). More precisely it is the block device major
2885 * and minor number that is chosen here.
2887 * Assume sd_probe is not re-entrant (for time being)
2888 * Also think about sd_probe() and sd_remove() running coincidentally.
2890 static int sd_probe(struct device *dev)
2892 struct scsi_device *sdp = to_scsi_device(dev);
2893 struct scsi_disk *sdkp;
2899 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2902 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2906 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2910 gd = alloc_disk(SD_MINORS);
2915 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2918 spin_lock(&sd_index_lock);
2919 error = ida_get_new(&sd_index_ida, &index);
2920 spin_unlock(&sd_index_lock);
2921 } while (error == -EAGAIN);
2924 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2928 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2930 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2931 goto out_free_index;
2935 sdkp->driver = &sd_template;
2937 sdkp->index = index;
2938 atomic_set(&sdkp->openers, 0);
2939 atomic_set(&sdkp->device->ioerr_cnt, 0);
2941 if (!sdp->request_queue->rq_timeout) {
2942 if (sdp->type != TYPE_MOD)
2943 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2945 blk_queue_rq_timeout(sdp->request_queue,
2949 device_initialize(&sdkp->dev);
2950 sdkp->dev.parent = dev;
2951 sdkp->dev.class = &sd_disk_class;
2952 dev_set_name(&sdkp->dev, dev_name(dev));
2954 if (device_add(&sdkp->dev))
2955 goto out_free_index;
2958 dev_set_drvdata(dev, sdkp);
2960 get_device(&sdkp->dev); /* prevent release before async_schedule */
2961 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2966 spin_lock(&sd_index_lock);
2967 ida_remove(&sd_index_ida, index);
2968 spin_unlock(&sd_index_lock);
2978 * sd_remove - called whenever a scsi disk (previously recognized by
2979 * sd_probe) is detached from the system. It is called (potentially
2980 * multiple times) during sd module unload.
2981 * @sdp: pointer to mid level scsi device object
2983 * Note: this function is invoked from the scsi mid-level.
2984 * This function potentially frees up a device name (e.g. /dev/sdc)
2985 * that could be re-used by a subsequent sd_probe().
2986 * This function is not called when the built-in sd driver is "exit-ed".
2988 static int sd_remove(struct device *dev)
2990 struct scsi_disk *sdkp;
2992 sdkp = dev_get_drvdata(dev);
2993 scsi_autopm_get_device(sdkp->device);
2995 async_synchronize_full_domain(&scsi_sd_probe_domain);
2996 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2997 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2998 device_del(&sdkp->dev);
2999 del_gendisk(sdkp->disk);
3002 mutex_lock(&sd_ref_mutex);
3003 dev_set_drvdata(dev, NULL);
3004 put_device(&sdkp->dev);
3005 mutex_unlock(&sd_ref_mutex);
3011 * scsi_disk_release - Called to free the scsi_disk structure
3012 * @dev: pointer to embedded class device
3014 * sd_ref_mutex must be held entering this routine. Because it is
3015 * called on last put, you should always use the scsi_disk_get()
3016 * scsi_disk_put() helpers which manipulate the semaphore directly
3017 * and never do a direct put_device.
3019 static void scsi_disk_release(struct device *dev)
3021 struct scsi_disk *sdkp = to_scsi_disk(dev);
3022 struct gendisk *disk = sdkp->disk;
3024 spin_lock(&sd_index_lock);
3025 ida_remove(&sd_index_ida, sdkp->index);
3026 spin_unlock(&sd_index_lock);
3028 disk->private_data = NULL;
3030 put_device(&sdkp->device->sdev_gendev);
3035 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3037 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3038 struct scsi_sense_hdr sshdr;
3039 struct scsi_device *sdp = sdkp->device;
3043 cmd[4] |= 1; /* START */
3045 if (sdp->start_stop_pwr_cond)
3046 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3048 if (!scsi_device_online(sdp))
3051 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3052 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3054 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3055 sd_print_result(sdkp, res);
3056 if (driver_byte(res) & DRIVER_SENSE)
3057 sd_print_sense_hdr(sdkp, &sshdr);
3064 * Send a SYNCHRONIZE CACHE instruction down to the device through
3065 * the normal SCSI command structure. Wait for the command to
3068 static void sd_shutdown(struct device *dev)
3070 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3073 return; /* this can happen */
3075 if (pm_runtime_suspended(dev))
3079 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3080 sd_sync_cache(sdkp);
3083 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3084 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3085 sd_start_stop_device(sdkp, 0);
3089 scsi_disk_put(sdkp);
3092 static int sd_suspend(struct device *dev)
3094 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3098 return 0; /* this can happen */
3101 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3102 ret = sd_sync_cache(sdkp);
3107 if (sdkp->device->manage_start_stop) {
3108 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3109 ret = sd_start_stop_device(sdkp, 0);
3113 scsi_disk_put(sdkp);
3117 static int sd_resume(struct device *dev)
3119 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3122 if (!sdkp->device->manage_start_stop)
3125 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3126 ret = sd_start_stop_device(sdkp, 1);
3129 scsi_disk_put(sdkp);
3134 * init_sd - entry point for this driver (both when built in or when
3137 * Note: this function registers this driver with the scsi mid-level.
3139 static int __init init_sd(void)
3141 int majors = 0, i, err;
3143 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3145 for (i = 0; i < SD_MAJORS; i++)
3146 if (register_blkdev(sd_major(i), "sd") == 0)
3152 err = class_register(&sd_disk_class);
3156 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3158 if (!sd_cdb_cache) {
3159 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3163 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3165 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3169 err = scsi_register_driver(&sd_template.gendrv);
3171 goto err_out_driver;
3176 mempool_destroy(sd_cdb_pool);
3179 kmem_cache_destroy(sd_cdb_cache);
3182 class_unregister(&sd_disk_class);
3184 for (i = 0; i < SD_MAJORS; i++)
3185 unregister_blkdev(sd_major(i), "sd");
3190 * exit_sd - exit point for this driver (when it is a module).
3192 * Note: this function unregisters this driver from the scsi mid-level.
3194 static void __exit exit_sd(void)
3198 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3200 scsi_unregister_driver(&sd_template.gendrv);
3201 mempool_destroy(sd_cdb_pool);
3202 kmem_cache_destroy(sd_cdb_cache);
3204 class_unregister(&sd_disk_class);
3206 for (i = 0; i < SD_MAJORS; i++)
3207 unregister_blkdev(sd_major(i), "sd");
3210 module_init(init_sd);
3211 module_exit(exit_sd);
3213 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3214 struct scsi_sense_hdr *sshdr)
3216 sd_printk(KERN_INFO, sdkp, " ");
3217 scsi_show_sense_hdr(sshdr);
3218 sd_printk(KERN_INFO, sdkp, " ");
3219 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3222 static void sd_print_result(struct scsi_disk *sdkp, int result)
3224 sd_printk(KERN_INFO, sdkp, " ");
3225 scsi_show_result(result);