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 <asm/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
67 #include "scsi_logging.h"
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99 static int sd_revalidate_disk(struct gendisk *);
100 static void sd_unlock_native_capacity(struct gendisk *disk);
101 static int sd_probe(struct device *);
102 static int sd_remove(struct device *);
103 static void sd_shutdown(struct device *);
104 static int sd_suspend(struct device *, pm_message_t state);
105 static int sd_resume(struct device *);
106 static void sd_rescan(struct device *);
107 static int sd_done(struct scsi_cmnd *);
108 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
109 static void scsi_disk_release(struct device *cdev);
110 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
111 static void sd_print_result(struct scsi_disk *, int);
113 static DEFINE_SPINLOCK(sd_index_lock);
114 static DEFINE_IDA(sd_index_ida);
116 /* This semaphore is used to mediate the 0->1 reference get in the
117 * face of object destruction (i.e. we can't allow a get on an
118 * object after last put) */
119 static DEFINE_MUTEX(sd_ref_mutex);
121 struct kmem_cache *sd_cdb_cache;
122 mempool_t *sd_cdb_pool;
124 static const char *sd_cache_types[] = {
125 "write through", "none", "write back",
126 "write back, no read (daft)"
130 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
131 const char *buf, size_t count)
133 int i, ct = -1, rcd, wce, sp;
134 struct scsi_disk *sdkp = to_scsi_disk(dev);
135 struct scsi_device *sdp = sdkp->device;
138 struct scsi_mode_data data;
139 struct scsi_sense_hdr sshdr;
142 if (sdp->type != TYPE_DISK)
143 /* no cache control on RBC devices; theoretically they
144 * can do it, but there's probably so many exceptions
145 * it's not worth the risk */
148 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
149 const int len = strlen(sd_cache_types[i]);
150 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
158 rcd = ct & 0x01 ? 1 : 0;
159 wce = ct & 0x02 ? 1 : 0;
160 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
161 SD_MAX_RETRIES, &data, NULL))
163 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
164 data.block_descriptor_length);
165 buffer_data = buffer + data.header_length +
166 data.block_descriptor_length;
167 buffer_data[2] &= ~0x05;
168 buffer_data[2] |= wce << 2 | rcd;
169 sp = buffer_data[0] & 0x80 ? 1 : 0;
171 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
172 SD_MAX_RETRIES, &data, &sshdr)) {
173 if (scsi_sense_valid(&sshdr))
174 sd_print_sense_hdr(sdkp, &sshdr);
177 revalidate_disk(sdkp->disk);
182 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
185 struct scsi_disk *sdkp = to_scsi_disk(dev);
186 struct scsi_device *sdp = sdkp->device;
188 if (!capable(CAP_SYS_ADMIN))
191 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
197 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
200 struct scsi_disk *sdkp = to_scsi_disk(dev);
201 struct scsi_device *sdp = sdkp->device;
203 if (!capable(CAP_SYS_ADMIN))
206 if (sdp->type != TYPE_DISK)
209 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
215 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
218 struct scsi_disk *sdkp = to_scsi_disk(dev);
219 int ct = sdkp->RCD + 2*sdkp->WCE;
221 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
225 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
227 struct scsi_disk *sdkp = to_scsi_disk(dev);
229 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
233 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
236 struct scsi_disk *sdkp = to_scsi_disk(dev);
237 struct scsi_device *sdp = sdkp->device;
239 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
243 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
246 struct scsi_disk *sdkp = to_scsi_disk(dev);
248 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
255 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
261 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
264 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 return snprintf(buf, 20, "%u\n", sdkp->ATO);
270 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
273 struct scsi_disk *sdkp = to_scsi_disk(dev);
275 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
278 static struct device_attribute sd_disk_attrs[] = {
279 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
280 sd_store_cache_type),
281 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
282 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
283 sd_store_allow_restart),
284 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
285 sd_store_manage_start_stop),
286 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
287 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
288 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
292 static struct class sd_disk_class = {
294 .owner = THIS_MODULE,
295 .dev_release = scsi_disk_release,
296 .dev_attrs = sd_disk_attrs,
299 static struct scsi_driver sd_template = {
300 .owner = THIS_MODULE,
305 .suspend = sd_suspend,
307 .shutdown = sd_shutdown,
314 * Device no to disk mapping:
316 * major disc2 disc p1
317 * |............|.............|....|....| <- dev_t
320 * Inside a major, we have 16k disks, however mapped non-
321 * contiguously. The first 16 disks are for major0, the next
322 * ones with major1, ... Disk 256 is for major0 again, disk 272
324 * As we stay compatible with our numbering scheme, we can reuse
325 * the well-know SCSI majors 8, 65--71, 136--143.
327 static int sd_major(int major_idx)
331 return SCSI_DISK0_MAJOR;
333 return SCSI_DISK1_MAJOR + major_idx - 1;
335 return SCSI_DISK8_MAJOR + major_idx - 8;
338 return 0; /* shut up gcc */
342 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
344 struct scsi_disk *sdkp = NULL;
346 if (disk->private_data) {
347 sdkp = scsi_disk(disk);
348 if (scsi_device_get(sdkp->device) == 0)
349 get_device(&sdkp->dev);
356 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
358 struct scsi_disk *sdkp;
360 mutex_lock(&sd_ref_mutex);
361 sdkp = __scsi_disk_get(disk);
362 mutex_unlock(&sd_ref_mutex);
366 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
368 struct scsi_disk *sdkp;
370 mutex_lock(&sd_ref_mutex);
371 sdkp = dev_get_drvdata(dev);
373 sdkp = __scsi_disk_get(sdkp->disk);
374 mutex_unlock(&sd_ref_mutex);
378 static void scsi_disk_put(struct scsi_disk *sdkp)
380 struct scsi_device *sdev = sdkp->device;
382 mutex_lock(&sd_ref_mutex);
383 put_device(&sdkp->dev);
384 scsi_device_put(sdev);
385 mutex_unlock(&sd_ref_mutex);
388 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
390 unsigned int prot_op = SCSI_PROT_NORMAL;
391 unsigned int dix = scsi_prot_sg_count(scmd);
393 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
395 prot_op = SCSI_PROT_READ_PASS;
396 else if (dif && !dix)
397 prot_op = SCSI_PROT_READ_STRIP;
398 else if (!dif && dix)
399 prot_op = SCSI_PROT_READ_INSERT;
402 prot_op = SCSI_PROT_WRITE_PASS;
403 else if (dif && !dix)
404 prot_op = SCSI_PROT_WRITE_INSERT;
405 else if (!dif && dix)
406 prot_op = SCSI_PROT_WRITE_STRIP;
409 scsi_set_prot_op(scmd, prot_op);
410 scsi_set_prot_type(scmd, dif);
414 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
415 * @sdp: scsi device to operate one
416 * @rq: Request to prepare
418 * Will issue either UNMAP or WRITE SAME(16) depending on preference
419 * indicated by target device.
421 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
423 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
424 struct bio *bio = rq->bio;
425 sector_t sector = bio->bi_sector;
426 unsigned int nr_sectors = bio_sectors(bio);
430 if (sdkp->device->sector_size == 4096) {
435 rq->cmd_type = REQ_TYPE_BLOCK_PC;
436 rq->timeout = SD_TIMEOUT;
438 memset(rq->cmd, 0, rq->cmd_len);
440 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
442 return BLKPREP_DEFER;
445 char *buf = page_address(page);
451 put_unaligned_be16(6 + 16, &buf[0]);
452 put_unaligned_be16(16, &buf[2]);
453 put_unaligned_be64(sector, &buf[8]);
454 put_unaligned_be32(nr_sectors, &buf[16]);
459 rq->cmd[0] = WRITE_SAME_16;
460 rq->cmd[1] = 0x8; /* UNMAP */
461 put_unaligned_be64(sector, &rq->cmd[2]);
462 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
464 len = sdkp->device->sector_size;
467 blk_add_request_payload(rq, page, len);
468 return scsi_setup_blk_pc_cmnd(sdp, rq);
472 * sd_init_command - build a scsi (read or write) command from
473 * information in the request structure.
474 * @SCpnt: pointer to mid-level's per scsi command structure that
475 * contains request and into which the scsi command is written
477 * Returns 1 if successful and 0 if error (or cannot be done now).
479 static int sd_prep_fn(struct request_queue *q, struct request *rq)
481 struct scsi_cmnd *SCpnt;
482 struct scsi_device *sdp = q->queuedata;
483 struct gendisk *disk = rq->rq_disk;
484 struct scsi_disk *sdkp;
485 sector_t block = blk_rq_pos(rq);
487 unsigned int this_count = blk_rq_sectors(rq);
489 unsigned char protect;
492 * Discard request come in as REQ_TYPE_FS but we turn them into
493 * block PC requests to make life easier.
495 if (rq->cmd_flags & REQ_DISCARD) {
496 ret = scsi_setup_discard_cmnd(sdp, rq);
498 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
499 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
501 } else if (rq->cmd_type != REQ_TYPE_FS) {
505 ret = scsi_setup_fs_cmnd(sdp, rq);
506 if (ret != BLKPREP_OK)
509 sdkp = scsi_disk(disk);
511 /* from here on until we're complete, any goto out
512 * is used for a killable error condition */
515 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
516 "sd_init_command: block=%llu, "
518 (unsigned long long)block,
521 if (!sdp || !scsi_device_online(sdp) ||
522 block + blk_rq_sectors(rq) > get_capacity(disk)) {
523 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
524 "Finishing %u sectors\n",
525 blk_rq_sectors(rq)));
526 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
527 "Retry with 0x%p\n", SCpnt));
533 * quietly refuse to do anything to a changed disc until
534 * the changed bit has been reset
536 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
541 * Some SD card readers can't handle multi-sector accesses which touch
542 * the last one or two hardware sectors. Split accesses as needed.
544 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
545 (sdp->sector_size / 512);
547 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
548 if (block < threshold) {
549 /* Access up to the threshold but not beyond */
550 this_count = threshold - block;
552 /* Access only a single hardware sector */
553 this_count = sdp->sector_size / 512;
557 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
558 (unsigned long long)block));
561 * If we have a 1K hardware sectorsize, prevent access to single
562 * 512 byte sectors. In theory we could handle this - in fact
563 * the scsi cdrom driver must be able to handle this because
564 * we typically use 1K blocksizes, and cdroms typically have
565 * 2K hardware sectorsizes. Of course, things are simpler
566 * with the cdrom, since it is read-only. For performance
567 * reasons, the filesystems should be able to handle this
568 * and not force the scsi disk driver to use bounce buffers
571 if (sdp->sector_size == 1024) {
572 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
573 scmd_printk(KERN_ERR, SCpnt,
574 "Bad block number requested\n");
578 this_count = this_count >> 1;
581 if (sdp->sector_size == 2048) {
582 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
583 scmd_printk(KERN_ERR, SCpnt,
584 "Bad block number requested\n");
588 this_count = this_count >> 2;
591 if (sdp->sector_size == 4096) {
592 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
593 scmd_printk(KERN_ERR, SCpnt,
594 "Bad block number requested\n");
598 this_count = this_count >> 3;
601 if (rq_data_dir(rq) == WRITE) {
602 if (!sdp->writeable) {
605 SCpnt->cmnd[0] = WRITE_6;
606 SCpnt->sc_data_direction = DMA_TO_DEVICE;
608 if (blk_integrity_rq(rq) &&
609 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
612 } else if (rq_data_dir(rq) == READ) {
613 SCpnt->cmnd[0] = READ_6;
614 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
616 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
620 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
621 "%s %d/%u 512 byte blocks.\n",
622 (rq_data_dir(rq) == WRITE) ?
623 "writing" : "reading", this_count,
624 blk_rq_sectors(rq)));
626 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
627 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
633 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
634 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
636 if (unlikely(SCpnt->cmnd == NULL)) {
641 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
642 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
643 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
644 SCpnt->cmnd[7] = 0x18;
645 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
646 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
649 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
650 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
651 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
652 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
653 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
654 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
655 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
656 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
658 /* Expected Indirect LBA */
659 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
660 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
661 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
662 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
664 /* Transfer length */
665 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
666 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
667 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
668 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
669 } else if (block > 0xffffffff) {
670 SCpnt->cmnd[0] += READ_16 - READ_6;
671 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
672 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
673 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
674 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
675 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
676 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
677 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
678 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
679 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
680 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
681 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
682 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
683 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
684 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
685 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
686 scsi_device_protection(SCpnt->device) ||
687 SCpnt->device->use_10_for_rw) {
688 if (this_count > 0xffff)
691 SCpnt->cmnd[0] += READ_10 - READ_6;
692 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
693 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
694 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
695 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
696 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
697 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
698 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
699 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
701 if (unlikely(rq->cmd_flags & REQ_FUA)) {
703 * This happens only if this drive failed
704 * 10byte rw command with ILLEGAL_REQUEST
705 * during operation and thus turned off
708 scmd_printk(KERN_ERR, SCpnt,
709 "FUA write on READ/WRITE(6) drive\n");
713 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
714 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
715 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
716 SCpnt->cmnd[4] = (unsigned char) this_count;
719 SCpnt->sdb.length = this_count * sdp->sector_size;
721 /* If DIF or DIX is enabled, tell HBA how to handle request */
722 if (host_dif || scsi_prot_sg_count(SCpnt))
723 sd_prot_op(SCpnt, host_dif);
726 * We shouldn't disconnect in the middle of a sector, so with a dumb
727 * host adapter, it's safe to assume that we can at least transfer
728 * this many bytes between each connect / disconnect.
730 SCpnt->transfersize = sdp->sector_size;
731 SCpnt->underflow = this_count << 9;
732 SCpnt->allowed = SD_MAX_RETRIES;
735 * This indicates that the command is ready from our end to be
740 return scsi_prep_return(q, rq, ret);
744 * sd_open - open a scsi disk device
745 * @inode: only i_rdev member may be used
746 * @filp: only f_mode and f_flags may be used
748 * Returns 0 if successful. Returns a negated errno value in case
751 * Note: This can be called from a user context (e.g. fsck(1) )
752 * or from within the kernel (e.g. as a result of a mount(1) ).
753 * In the latter case @inode and @filp carry an abridged amount
754 * of information as noted above.
756 static int sd_open(struct block_device *bdev, fmode_t mode)
758 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
759 struct scsi_device *sdev;
765 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
770 * If the device is in error recovery, wait until it is done.
771 * If the device is offline, then disallow any access to it.
774 if (!scsi_block_when_processing_errors(sdev))
777 if (sdev->removable || sdkp->write_prot)
778 check_disk_change(bdev);
781 * If the drive is empty, just let the open fail.
784 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
788 * If the device has the write protect tab set, have the open fail
789 * if the user expects to be able to write to the thing.
792 if (sdkp->write_prot && (mode & FMODE_WRITE))
796 * It is possible that the disk changing stuff resulted in
797 * the device being taken offline. If this is the case,
798 * report this to the user, and don't pretend that the
799 * open actually succeeded.
802 if (!scsi_device_online(sdev))
805 if (!sdkp->openers++ && sdev->removable) {
806 if (scsi_block_when_processing_errors(sdev))
807 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
818 * sd_release - invoked when the (last) close(2) is called on this
820 * @inode: only i_rdev member may be used
821 * @filp: only f_mode and f_flags may be used
825 * Note: may block (uninterruptible) if error recovery is underway
828 static int sd_release(struct gendisk *disk, fmode_t mode)
830 struct scsi_disk *sdkp = scsi_disk(disk);
831 struct scsi_device *sdev = sdkp->device;
833 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
835 if (!--sdkp->openers && sdev->removable) {
836 if (scsi_block_when_processing_errors(sdev))
837 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
841 * XXX and what if there are packets in flight and this close()
842 * XXX is followed by a "rmmod sd_mod"?
848 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
850 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
851 struct scsi_device *sdp = sdkp->device;
852 struct Scsi_Host *host = sdp->host;
855 /* default to most commonly used values */
856 diskinfo[0] = 0x40; /* 1 << 6 */
857 diskinfo[1] = 0x20; /* 1 << 5 */
858 diskinfo[2] = sdkp->capacity >> 11;
860 /* override with calculated, extended default, or driver values */
861 if (host->hostt->bios_param)
862 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
864 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
866 geo->heads = diskinfo[0];
867 geo->sectors = diskinfo[1];
868 geo->cylinders = diskinfo[2];
873 * sd_ioctl - process an ioctl
874 * @inode: only i_rdev/i_bdev members may be used
875 * @filp: only f_mode and f_flags may be used
876 * @cmd: ioctl command number
877 * @arg: this is third argument given to ioctl(2) system call.
878 * Often contains a pointer.
880 * Returns 0 if successful (some ioctls return postive numbers on
881 * success as well). Returns a negated errno value in case of error.
883 * Note: most ioctls are forward onto the block subsystem or further
884 * down in the scsi subsystem.
886 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
887 unsigned int cmd, unsigned long arg)
889 struct gendisk *disk = bdev->bd_disk;
890 struct scsi_device *sdp = scsi_disk(disk)->device;
891 void __user *p = (void __user *)arg;
894 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
895 disk->disk_name, cmd));
898 * If we are in the middle of error recovery, don't let anyone
899 * else try and use this device. Also, if error recovery fails, it
900 * may try and take the device offline, in which case all further
901 * access to the device is prohibited.
903 error = scsi_nonblockable_ioctl(sdp, cmd, p,
904 (mode & FMODE_NDELAY) != 0);
905 if (!scsi_block_when_processing_errors(sdp) || !error)
909 * Send SCSI addressing ioctls directly to mid level, send other
910 * ioctls to block level and then onto mid level if they can't be
914 case SCSI_IOCTL_GET_IDLUN:
915 case SCSI_IOCTL_GET_BUS_NUMBER:
916 return scsi_ioctl(sdp, cmd, p);
918 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
919 if (error != -ENOTTY)
922 return scsi_ioctl(sdp, cmd, p);
925 static void set_media_not_present(struct scsi_disk *sdkp)
927 sdkp->media_present = 0;
929 sdkp->device->changed = 1;
933 * sd_media_changed - check if our medium changed
934 * @disk: kernel device descriptor
936 * Returns 0 if not applicable or no change; 1 if change
938 * Note: this function is invoked from the block subsystem.
940 static int sd_media_changed(struct gendisk *disk)
942 struct scsi_disk *sdkp = scsi_disk(disk);
943 struct scsi_device *sdp = sdkp->device;
944 struct scsi_sense_hdr *sshdr = NULL;
947 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
953 * If the device is offline, don't send any commands - just pretend as
954 * if the command failed. If the device ever comes back online, we
955 * can deal with it then. It is only because of unrecoverable errors
956 * that we would ever take a device offline in the first place.
958 if (!scsi_device_online(sdp)) {
959 set_media_not_present(sdkp);
965 * Using TEST_UNIT_READY enables differentiation between drive with
966 * no cartridge loaded - NOT READY, drive with changed cartridge -
967 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
969 * Drives that auto spin down. eg iomega jaz 1G, will be started
970 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
971 * sd_revalidate() is called.
975 if (scsi_block_when_processing_errors(sdp)) {
976 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
977 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
982 * Unable to test, unit probably not ready. This usually
983 * means there is no disc in the drive. Mark as changed,
984 * and we will figure it out later once the drive is
987 if (retval || (scsi_sense_valid(sshdr) &&
988 /* 0x3a is medium not present */
989 sshdr->asc == 0x3a)) {
990 set_media_not_present(sdkp);
996 * For removable scsi disk we have to recognise the presence
997 * of a disk in the drive. This is kept in the struct scsi_disk
998 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1000 sdkp->media_present = 1;
1002 retval = sdp->changed;
1005 if (retval != sdkp->previous_state)
1006 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1007 sdkp->previous_state = retval;
1012 static int sd_sync_cache(struct scsi_disk *sdkp)
1015 struct scsi_device *sdp = sdkp->device;
1016 struct scsi_sense_hdr sshdr;
1018 if (!scsi_device_online(sdp))
1022 for (retries = 3; retries > 0; --retries) {
1023 unsigned char cmd[10] = { 0 };
1025 cmd[0] = SYNCHRONIZE_CACHE;
1027 * Leave the rest of the command zero to indicate
1030 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1031 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1037 sd_print_result(sdkp, res);
1038 if (driver_byte(res) & DRIVER_SENSE)
1039 sd_print_sense_hdr(sdkp, &sshdr);
1047 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
1049 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1050 rq->timeout = SD_TIMEOUT;
1051 rq->retries = SD_MAX_RETRIES;
1052 rq->cmd[0] = SYNCHRONIZE_CACHE;
1056 static void sd_rescan(struct device *dev)
1058 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1061 revalidate_disk(sdkp->disk);
1062 scsi_disk_put(sdkp);
1067 #ifdef CONFIG_COMPAT
1069 * This gets directly called from VFS. When the ioctl
1070 * is not recognized we go back to the other translation paths.
1072 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1073 unsigned int cmd, unsigned long arg)
1075 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1078 * If we are in the middle of error recovery, don't let anyone
1079 * else try and use this device. Also, if error recovery fails, it
1080 * may try and take the device offline, in which case all further
1081 * access to the device is prohibited.
1083 if (!scsi_block_when_processing_errors(sdev))
1086 if (sdev->host->hostt->compat_ioctl) {
1089 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1095 * Let the static ioctl translation table take care of it.
1097 return -ENOIOCTLCMD;
1101 static const struct block_device_operations sd_fops = {
1102 .owner = THIS_MODULE,
1104 .release = sd_release,
1105 .locked_ioctl = sd_ioctl,
1106 .getgeo = sd_getgeo,
1107 #ifdef CONFIG_COMPAT
1108 .compat_ioctl = sd_compat_ioctl,
1110 .media_changed = sd_media_changed,
1111 .revalidate_disk = sd_revalidate_disk,
1112 .unlock_native_capacity = sd_unlock_native_capacity,
1115 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1117 u64 start_lba = blk_rq_pos(scmd->request);
1118 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1122 if (scmd->request->cmd_type != REQ_TYPE_FS)
1125 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1126 SCSI_SENSE_BUFFERSIZE,
1131 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1134 if (scmd->device->sector_size < 512) {
1135 /* only legitimate sector_size here is 256 */
1139 /* be careful ... don't want any overflows */
1140 u64 factor = scmd->device->sector_size / 512;
1141 do_div(start_lba, factor);
1142 do_div(end_lba, factor);
1145 /* The bad lba was reported incorrectly, we have no idea where
1148 if (bad_lba < start_lba || bad_lba >= end_lba)
1151 /* This computation should always be done in terms of
1152 * the resolution of the device's medium.
1154 return (bad_lba - start_lba) * scmd->device->sector_size;
1158 * sd_done - bottom half handler: called when the lower level
1159 * driver has completed (successfully or otherwise) a scsi command.
1160 * @SCpnt: mid-level's per command structure.
1162 * Note: potentially run from within an ISR. Must not block.
1164 static int sd_done(struct scsi_cmnd *SCpnt)
1166 int result = SCpnt->result;
1167 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1168 struct scsi_sense_hdr sshdr;
1169 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1170 int sense_valid = 0;
1171 int sense_deferred = 0;
1174 * If this is a discard request that originated from the kernel
1175 * we need to free our payload here. Note that we need to check
1176 * the request flag as the normal payload rules apply for
1177 * pass-through UNMAP / WRITE SAME requests.
1179 if (SCpnt->request->cmd_flags & REQ_DISCARD)
1180 __free_page(bio_page(SCpnt->request->bio));
1183 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1185 sense_deferred = scsi_sense_is_deferred(&sshdr);
1187 #ifdef CONFIG_SCSI_LOGGING
1188 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1190 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1191 "sd_done: sb[respc,sk,asc,"
1192 "ascq]=%x,%x,%x,%x\n",
1193 sshdr.response_code,
1194 sshdr.sense_key, sshdr.asc,
1198 if (driver_byte(result) != DRIVER_SENSE &&
1199 (!sense_valid || sense_deferred))
1202 switch (sshdr.sense_key) {
1203 case HARDWARE_ERROR:
1205 good_bytes = sd_completed_bytes(SCpnt);
1207 case RECOVERED_ERROR:
1208 good_bytes = scsi_bufflen(SCpnt);
1211 /* This indicates a false check condition, so ignore it. An
1212 * unknown amount of data was transferred so treat it as an
1215 scsi_print_sense("sd", SCpnt);
1217 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1219 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1220 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1221 if (sshdr.asc == 0x10)
1222 good_bytes = sd_completed_bytes(SCpnt);
1228 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1229 sd_dif_complete(SCpnt, good_bytes);
1231 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1232 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1234 /* We have to print a failed command here as the
1235 * extended CDB gets freed before scsi_io_completion()
1239 scsi_print_command(SCpnt);
1241 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1249 static int media_not_present(struct scsi_disk *sdkp,
1250 struct scsi_sense_hdr *sshdr)
1253 if (!scsi_sense_valid(sshdr))
1255 /* not invoked for commands that could return deferred errors */
1256 if (sshdr->sense_key != NOT_READY &&
1257 sshdr->sense_key != UNIT_ATTENTION)
1259 if (sshdr->asc != 0x3A) /* medium not present */
1262 set_media_not_present(sdkp);
1267 * spinup disk - called only in sd_revalidate_disk()
1270 sd_spinup_disk(struct scsi_disk *sdkp)
1272 unsigned char cmd[10];
1273 unsigned long spintime_expire = 0;
1274 int retries, spintime;
1275 unsigned int the_result;
1276 struct scsi_sense_hdr sshdr;
1277 int sense_valid = 0;
1281 /* Spin up drives, as required. Only do this at boot time */
1282 /* Spinup needs to be done for module loads too. */
1287 cmd[0] = TEST_UNIT_READY;
1288 memset((void *) &cmd[1], 0, 9);
1290 the_result = scsi_execute_req(sdkp->device, cmd,
1293 SD_MAX_RETRIES, NULL);
1296 * If the drive has indicated to us that it
1297 * doesn't have any media in it, don't bother
1298 * with any more polling.
1300 if (media_not_present(sdkp, &sshdr))
1304 sense_valid = scsi_sense_valid(&sshdr);
1306 } while (retries < 3 &&
1307 (!scsi_status_is_good(the_result) ||
1308 ((driver_byte(the_result) & DRIVER_SENSE) &&
1309 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1311 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1312 /* no sense, TUR either succeeded or failed
1313 * with a status error */
1314 if(!spintime && !scsi_status_is_good(the_result)) {
1315 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1316 sd_print_result(sdkp, the_result);
1322 * The device does not want the automatic start to be issued.
1324 if (sdkp->device->no_start_on_add)
1327 if (sense_valid && sshdr.sense_key == NOT_READY) {
1328 if (sshdr.asc == 4 && sshdr.ascq == 3)
1329 break; /* manual intervention required */
1330 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1331 break; /* standby */
1332 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1333 break; /* unavailable */
1335 * Issue command to spin up drive when not ready
1338 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1339 cmd[0] = START_STOP;
1340 cmd[1] = 1; /* Return immediately */
1341 memset((void *) &cmd[2], 0, 8);
1342 cmd[4] = 1; /* Start spin cycle */
1343 if (sdkp->device->start_stop_pwr_cond)
1345 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1347 SD_TIMEOUT, SD_MAX_RETRIES,
1349 spintime_expire = jiffies + 100 * HZ;
1352 /* Wait 1 second for next try */
1357 * Wait for USB flash devices with slow firmware.
1358 * Yes, this sense key/ASC combination shouldn't
1359 * occur here. It's characteristic of these devices.
1361 } else if (sense_valid &&
1362 sshdr.sense_key == UNIT_ATTENTION &&
1363 sshdr.asc == 0x28) {
1365 spintime_expire = jiffies + 5 * HZ;
1368 /* Wait 1 second for next try */
1371 /* we don't understand the sense code, so it's
1372 * probably pointless to loop */
1374 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1375 sd_print_sense_hdr(sdkp, &sshdr);
1380 } while (spintime && time_before_eq(jiffies, spintime_expire));
1383 if (scsi_status_is_good(the_result))
1386 printk("not responding...\n");
1392 * Determine whether disk supports Data Integrity Field.
1394 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1396 struct scsi_device *sdp = sdkp->device;
1399 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1402 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1404 if (type == sdkp->protection_type || !sdkp->first_scan)
1407 sdkp->protection_type = type;
1409 if (type > SD_DIF_TYPE3_PROTECTION) {
1410 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1411 "protection type %u. Disabling disk!\n", type);
1416 if (scsi_host_dif_capable(sdp->host, type))
1417 sd_printk(KERN_NOTICE, sdkp,
1418 "Enabling DIF Type %u protection\n", type);
1420 sd_printk(KERN_NOTICE, sdkp,
1421 "Disabling DIF Type %u protection\n", type);
1424 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1425 struct scsi_sense_hdr *sshdr, int sense_valid,
1428 sd_print_result(sdkp, the_result);
1429 if (driver_byte(the_result) & DRIVER_SENSE)
1430 sd_print_sense_hdr(sdkp, sshdr);
1432 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1435 * Set dirty bit for removable devices if not ready -
1436 * sometimes drives will not report this properly.
1438 if (sdp->removable &&
1439 sense_valid && sshdr->sense_key == NOT_READY)
1443 * We used to set media_present to 0 here to indicate no media
1444 * in the drive, but some drives fail read capacity even with
1445 * media present, so we can't do that.
1447 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1451 #if RC16_LEN > SD_BUF_SIZE
1452 #error RC16_LEN must not be more than SD_BUF_SIZE
1455 #define READ_CAPACITY_RETRIES_ON_RESET 10
1457 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1458 unsigned char *buffer)
1460 unsigned char cmd[16];
1461 struct scsi_sense_hdr sshdr;
1462 int sense_valid = 0;
1464 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1465 unsigned int alignment;
1466 unsigned long long lba;
1467 unsigned sector_size;
1471 cmd[0] = SERVICE_ACTION_IN;
1472 cmd[1] = SAI_READ_CAPACITY_16;
1474 memset(buffer, 0, RC16_LEN);
1476 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1477 buffer, RC16_LEN, &sshdr,
1478 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1480 if (media_not_present(sdkp, &sshdr))
1484 sense_valid = scsi_sense_valid(&sshdr);
1486 sshdr.sense_key == ILLEGAL_REQUEST &&
1487 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1489 /* Invalid Command Operation Code or
1490 * Invalid Field in CDB, just retry
1491 * silently with RC10 */
1494 sshdr.sense_key == UNIT_ATTENTION &&
1495 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1496 /* Device reset might occur several times,
1497 * give it one more chance */
1498 if (--reset_retries > 0)
1503 } while (the_result && retries);
1506 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1507 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1511 sector_size = get_unaligned_be32(&buffer[8]);
1512 lba = get_unaligned_be64(&buffer[0]);
1514 sd_read_protection_type(sdkp, buffer);
1516 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1517 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1518 "kernel compiled with support for large block "
1524 /* Logical blocks per physical block exponent */
1525 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1527 /* Lowest aligned logical block */
1528 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1529 blk_queue_alignment_offset(sdp->request_queue, alignment);
1530 if (alignment && sdkp->first_scan)
1531 sd_printk(KERN_NOTICE, sdkp,
1532 "physical block alignment offset: %u\n", alignment);
1534 if (buffer[14] & 0x80) { /* TPE */
1535 struct request_queue *q = sdp->request_queue;
1537 sdkp->thin_provisioning = 1;
1538 q->limits.discard_granularity = sdkp->hw_sector_size;
1539 q->limits.max_discard_sectors = 0xffffffff;
1541 if (buffer[14] & 0x40) /* TPRZ */
1542 q->limits.discard_zeroes_data = 1;
1544 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1547 sdkp->capacity = lba + 1;
1551 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1552 unsigned char *buffer)
1554 unsigned char cmd[16];
1555 struct scsi_sense_hdr sshdr;
1556 int sense_valid = 0;
1558 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1560 unsigned sector_size;
1563 cmd[0] = READ_CAPACITY;
1564 memset(&cmd[1], 0, 9);
1565 memset(buffer, 0, 8);
1567 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1569 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1571 if (media_not_present(sdkp, &sshdr))
1575 sense_valid = scsi_sense_valid(&sshdr);
1577 sshdr.sense_key == UNIT_ATTENTION &&
1578 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1579 /* Device reset might occur several times,
1580 * give it one more chance */
1581 if (--reset_retries > 0)
1586 } while (the_result && retries);
1589 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1590 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1594 sector_size = get_unaligned_be32(&buffer[4]);
1595 lba = get_unaligned_be32(&buffer[0]);
1597 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1598 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1599 "kernel compiled with support for large block "
1605 sdkp->capacity = lba + 1;
1606 sdkp->hw_sector_size = sector_size;
1610 static int sd_try_rc16_first(struct scsi_device *sdp)
1612 if (sdp->host->max_cmd_len < 16)
1614 if (sdp->scsi_level > SCSI_SPC_2)
1616 if (scsi_device_protection(sdp))
1622 * read disk capacity
1625 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1628 struct scsi_device *sdp = sdkp->device;
1629 sector_t old_capacity = sdkp->capacity;
1631 if (sd_try_rc16_first(sdp)) {
1632 sector_size = read_capacity_16(sdkp, sdp, buffer);
1633 if (sector_size == -EOVERFLOW)
1635 if (sector_size == -ENODEV)
1637 if (sector_size < 0)
1638 sector_size = read_capacity_10(sdkp, sdp, buffer);
1639 if (sector_size < 0)
1642 sector_size = read_capacity_10(sdkp, sdp, buffer);
1643 if (sector_size == -EOVERFLOW)
1645 if (sector_size < 0)
1647 if ((sizeof(sdkp->capacity) > 4) &&
1648 (sdkp->capacity > 0xffffffffULL)) {
1649 int old_sector_size = sector_size;
1650 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1651 "Trying to use READ CAPACITY(16).\n");
1652 sector_size = read_capacity_16(sdkp, sdp, buffer);
1653 if (sector_size < 0) {
1654 sd_printk(KERN_NOTICE, sdkp,
1655 "Using 0xffffffff as device size\n");
1656 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1657 sector_size = old_sector_size;
1663 /* Some devices are known to return the total number of blocks,
1664 * not the highest block number. Some devices have versions
1665 * which do this and others which do not. Some devices we might
1666 * suspect of doing this but we don't know for certain.
1668 * If we know the reported capacity is wrong, decrement it. If
1669 * we can only guess, then assume the number of blocks is even
1670 * (usually true but not always) and err on the side of lowering
1673 if (sdp->fix_capacity ||
1674 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1675 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1676 "from its reported value: %llu\n",
1677 (unsigned long long) sdkp->capacity);
1682 if (sector_size == 0) {
1684 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1688 if (sector_size != 512 &&
1689 sector_size != 1024 &&
1690 sector_size != 2048 &&
1691 sector_size != 4096 &&
1692 sector_size != 256) {
1693 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1696 * The user might want to re-format the drive with
1697 * a supported sectorsize. Once this happens, it
1698 * would be relatively trivial to set the thing up.
1699 * For this reason, we leave the thing in the table.
1703 * set a bogus sector size so the normal read/write
1704 * logic in the block layer will eventually refuse any
1705 * request on this device without tripping over power
1706 * of two sector size assumptions
1710 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1713 char cap_str_2[10], cap_str_10[10];
1714 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1716 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1718 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1719 sizeof(cap_str_10));
1721 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1722 sd_printk(KERN_NOTICE, sdkp,
1723 "%llu %d-byte logical blocks: (%s/%s)\n",
1724 (unsigned long long)sdkp->capacity,
1725 sector_size, cap_str_10, cap_str_2);
1727 if (sdkp->hw_sector_size != sector_size)
1728 sd_printk(KERN_NOTICE, sdkp,
1729 "%u-byte physical blocks\n",
1730 sdkp->hw_sector_size);
1734 /* Rescale capacity to 512-byte units */
1735 if (sector_size == 4096)
1736 sdkp->capacity <<= 3;
1737 else if (sector_size == 2048)
1738 sdkp->capacity <<= 2;
1739 else if (sector_size == 1024)
1740 sdkp->capacity <<= 1;
1741 else if (sector_size == 256)
1742 sdkp->capacity >>= 1;
1744 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1745 sdkp->device->sector_size = sector_size;
1748 /* called with buffer of length 512 */
1750 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1751 unsigned char *buffer, int len, struct scsi_mode_data *data,
1752 struct scsi_sense_hdr *sshdr)
1754 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1755 SD_TIMEOUT, SD_MAX_RETRIES, data,
1760 * read write protect setting, if possible - called only in sd_revalidate_disk()
1761 * called with buffer of length SD_BUF_SIZE
1764 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1767 struct scsi_device *sdp = sdkp->device;
1768 struct scsi_mode_data data;
1769 int old_wp = sdkp->write_prot;
1771 set_disk_ro(sdkp->disk, 0);
1772 if (sdp->skip_ms_page_3f) {
1773 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1777 if (sdp->use_192_bytes_for_3f) {
1778 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1781 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1782 * We have to start carefully: some devices hang if we ask
1783 * for more than is available.
1785 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1788 * Second attempt: ask for page 0 When only page 0 is
1789 * implemented, a request for page 3F may return Sense Key
1790 * 5: Illegal Request, Sense Code 24: Invalid field in
1793 if (!scsi_status_is_good(res))
1794 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1797 * Third attempt: ask 255 bytes, as we did earlier.
1799 if (!scsi_status_is_good(res))
1800 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1804 if (!scsi_status_is_good(res)) {
1805 sd_printk(KERN_WARNING, sdkp,
1806 "Test WP failed, assume Write Enabled\n");
1808 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1809 set_disk_ro(sdkp->disk, sdkp->write_prot);
1810 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1811 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1812 sdkp->write_prot ? "on" : "off");
1813 sd_printk(KERN_DEBUG, sdkp,
1814 "Mode Sense: %02x %02x %02x %02x\n",
1815 buffer[0], buffer[1], buffer[2], buffer[3]);
1821 * sd_read_cache_type - called only from sd_revalidate_disk()
1822 * called with buffer of length SD_BUF_SIZE
1825 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1828 struct scsi_device *sdp = sdkp->device;
1832 struct scsi_mode_data data;
1833 struct scsi_sense_hdr sshdr;
1834 int old_wce = sdkp->WCE;
1835 int old_rcd = sdkp->RCD;
1836 int old_dpofua = sdkp->DPOFUA;
1838 if (sdp->skip_ms_page_8)
1841 if (sdp->type == TYPE_RBC) {
1849 /* cautiously ask */
1850 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1852 if (!scsi_status_is_good(res))
1855 if (!data.header_length) {
1857 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1860 /* that went OK, now ask for the proper length */
1864 * We're only interested in the first three bytes, actually.
1865 * But the data cache page is defined for the first 20.
1872 /* Take headers and block descriptors into account */
1873 len += data.header_length + data.block_descriptor_length;
1874 if (len > SD_BUF_SIZE)
1878 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1880 if (scsi_status_is_good(res)) {
1881 int offset = data.header_length + data.block_descriptor_length;
1883 if (offset >= SD_BUF_SIZE - 2) {
1884 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1888 if ((buffer[offset] & 0x3f) != modepage) {
1889 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1893 if (modepage == 8) {
1894 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1895 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1897 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1901 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1902 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1903 sd_printk(KERN_NOTICE, sdkp,
1904 "Uses READ/WRITE(6), disabling FUA\n");
1908 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1909 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1910 sd_printk(KERN_NOTICE, sdkp,
1911 "Write cache: %s, read cache: %s, %s\n",
1912 sdkp->WCE ? "enabled" : "disabled",
1913 sdkp->RCD ? "disabled" : "enabled",
1914 sdkp->DPOFUA ? "supports DPO and FUA"
1915 : "doesn't support DPO or FUA");
1921 if (scsi_sense_valid(&sshdr) &&
1922 sshdr.sense_key == ILLEGAL_REQUEST &&
1923 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1924 /* Invalid field in CDB */
1925 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1927 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1930 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1937 * The ATO bit indicates whether the DIF application tag is available
1938 * for use by the operating system.
1940 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1943 struct scsi_device *sdp = sdkp->device;
1944 struct scsi_mode_data data;
1945 struct scsi_sense_hdr sshdr;
1947 if (sdp->type != TYPE_DISK)
1950 if (sdkp->protection_type == 0)
1953 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1954 SD_MAX_RETRIES, &data, &sshdr);
1956 if (!scsi_status_is_good(res) || !data.header_length ||
1958 sd_printk(KERN_WARNING, sdkp,
1959 "getting Control mode page failed, assume no ATO\n");
1961 if (scsi_sense_valid(&sshdr))
1962 sd_print_sense_hdr(sdkp, &sshdr);
1967 offset = data.header_length + data.block_descriptor_length;
1969 if ((buffer[offset] & 0x3f) != 0x0a) {
1970 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1974 if ((buffer[offset + 5] & 0x80) == 0)
1983 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1984 * @disk: disk to query
1986 static void sd_read_block_limits(struct scsi_disk *sdkp)
1988 struct request_queue *q = sdkp->disk->queue;
1989 unsigned int sector_sz = sdkp->device->sector_size;
1990 const int vpd_len = 64;
1991 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
1994 /* Block Limits VPD */
1995 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
1998 blk_queue_io_min(sdkp->disk->queue,
1999 get_unaligned_be16(&buffer[6]) * sector_sz);
2000 blk_queue_io_opt(sdkp->disk->queue,
2001 get_unaligned_be32(&buffer[12]) * sector_sz);
2003 /* Thin provisioning enabled and page length indicates TP support */
2004 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2005 unsigned int lba_count, desc_count, granularity;
2007 lba_count = get_unaligned_be32(&buffer[20]);
2008 desc_count = get_unaligned_be32(&buffer[24]);
2011 q->limits.max_discard_sectors =
2012 lba_count * sector_sz >> 9;
2018 granularity = get_unaligned_be32(&buffer[28]);
2021 q->limits.discard_granularity = granularity * sector_sz;
2023 if (buffer[32] & 0x80)
2024 q->limits.discard_alignment =
2025 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2033 * sd_read_block_characteristics - Query block dev. characteristics
2034 * @disk: disk to query
2036 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2038 unsigned char *buffer;
2040 const int vpd_len = 64;
2042 buffer = kmalloc(vpd_len, GFP_KERNEL);
2045 /* Block Device Characteristics VPD */
2046 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2049 rot = get_unaligned_be16(&buffer[4]);
2052 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2058 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2061 * Although VPD inquiries can go to SCSI-2 type devices,
2062 * some USB ones crash on receiving them, and the pages
2063 * we currently ask for are for SPC-3 and beyond
2065 if (sdp->scsi_level > SCSI_SPC_2)
2071 * sd_revalidate_disk - called the first time a new disk is seen,
2072 * performs disk spin up, read_capacity, etc.
2073 * @disk: struct gendisk we care about
2075 static int sd_revalidate_disk(struct gendisk *disk)
2077 struct scsi_disk *sdkp = scsi_disk(disk);
2078 struct scsi_device *sdp = sdkp->device;
2079 unsigned char *buffer;
2082 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2083 "sd_revalidate_disk\n"));
2086 * If the device is offline, don't try and read capacity or any
2087 * of the other niceties.
2089 if (!scsi_device_online(sdp))
2092 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2094 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2095 "allocation failure.\n");
2099 sd_spinup_disk(sdkp);
2102 * Without media there is no reason to ask; moreover, some devices
2103 * react badly if we do.
2105 if (sdkp->media_present) {
2106 sd_read_capacity(sdkp, buffer);
2108 if (sd_try_extended_inquiry(sdp)) {
2109 sd_read_block_limits(sdkp);
2110 sd_read_block_characteristics(sdkp);
2113 sd_read_write_protect_flag(sdkp, buffer);
2114 sd_read_cache_type(sdkp, buffer);
2115 sd_read_app_tag_own(sdkp, buffer);
2118 sdkp->first_scan = 0;
2121 * We now have all cache related info, determine how we deal
2122 * with ordered requests. Note that as the current SCSI
2123 * dispatch function can alter request order, we cannot use
2124 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2127 ordered = sdkp->DPOFUA
2128 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2130 ordered = QUEUE_ORDERED_DRAIN;
2132 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
2134 set_capacity(disk, sdkp->capacity);
2142 * sd_unlock_native_capacity - unlock native capacity
2143 * @disk: struct gendisk to set capacity for
2145 * Block layer calls this function if it detects that partitions
2146 * on @disk reach beyond the end of the device. If the SCSI host
2147 * implements ->unlock_native_capacity() method, it's invoked to
2148 * give it a chance to adjust the device capacity.
2151 * Defined by block layer. Might sleep.
2153 static void sd_unlock_native_capacity(struct gendisk *disk)
2155 struct scsi_device *sdev = scsi_disk(disk)->device;
2157 if (sdev->host->hostt->unlock_native_capacity)
2158 sdev->host->hostt->unlock_native_capacity(sdev);
2162 * sd_format_disk_name - format disk name
2163 * @prefix: name prefix - ie. "sd" for SCSI disks
2164 * @index: index of the disk to format name for
2165 * @buf: output buffer
2166 * @buflen: length of the output buffer
2168 * SCSI disk names starts at sda. The 26th device is sdz and the
2169 * 27th is sdaa. The last one for two lettered suffix is sdzz
2170 * which is followed by sdaaa.
2172 * This is basically 26 base counting with one extra 'nil' entry
2173 * at the beginning from the second digit on and can be
2174 * determined using similar method as 26 base conversion with the
2175 * index shifted -1 after each digit is computed.
2181 * 0 on success, -errno on failure.
2183 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2185 const int base = 'z' - 'a' + 1;
2186 char *begin = buf + strlen(prefix);
2187 char *end = buf + buflen;
2197 *--p = 'a' + (index % unit);
2198 index = (index / unit) - 1;
2199 } while (index >= 0);
2201 memmove(begin, p, end - p);
2202 memcpy(buf, prefix, strlen(prefix));
2208 * The asynchronous part of sd_probe
2210 static void sd_probe_async(void *data, async_cookie_t cookie)
2212 struct scsi_disk *sdkp = data;
2213 struct scsi_device *sdp;
2220 index = sdkp->index;
2221 dev = &sdp->sdev_gendev;
2223 if (index < SD_MAX_DISKS) {
2224 gd->major = sd_major((index & 0xf0) >> 4);
2225 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2226 gd->minors = SD_MINORS;
2228 gd->fops = &sd_fops;
2229 gd->private_data = &sdkp->driver;
2230 gd->queue = sdkp->device->request_queue;
2232 /* defaults, until the device tells us otherwise */
2233 sdp->sector_size = 512;
2235 sdkp->media_present = 1;
2236 sdkp->write_prot = 0;
2240 sdkp->first_scan = 1;
2242 sd_revalidate_disk(gd);
2244 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2246 gd->driverfs_dev = &sdp->sdev_gendev;
2247 gd->flags = GENHD_FL_EXT_DEVT;
2249 gd->flags |= GENHD_FL_REMOVABLE;
2251 dev_set_drvdata(dev, sdkp);
2253 sd_dif_config_host(sdkp);
2255 sd_revalidate_disk(gd);
2257 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2258 sdp->removable ? "removable " : "");
2259 put_device(&sdkp->dev);
2263 * sd_probe - called during driver initialization and whenever a
2264 * new scsi device is attached to the system. It is called once
2265 * for each scsi device (not just disks) present.
2266 * @dev: pointer to device object
2268 * Returns 0 if successful (or not interested in this scsi device
2269 * (e.g. scanner)); 1 when there is an error.
2271 * Note: this function is invoked from the scsi mid-level.
2272 * This function sets up the mapping between a given
2273 * <host,channel,id,lun> (found in sdp) and new device name
2274 * (e.g. /dev/sda). More precisely it is the block device major
2275 * and minor number that is chosen here.
2277 * Assume sd_attach is not re-entrant (for time being)
2278 * Also think about sd_attach() and sd_remove() running coincidentally.
2280 static int sd_probe(struct device *dev)
2282 struct scsi_device *sdp = to_scsi_device(dev);
2283 struct scsi_disk *sdkp;
2289 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2292 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2296 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2300 gd = alloc_disk(SD_MINORS);
2305 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2308 spin_lock(&sd_index_lock);
2309 error = ida_get_new(&sd_index_ida, &index);
2310 spin_unlock(&sd_index_lock);
2311 } while (error == -EAGAIN);
2316 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2318 goto out_free_index;
2321 sdkp->driver = &sd_template;
2323 sdkp->index = index;
2325 sdkp->previous_state = 1;
2327 if (!sdp->request_queue->rq_timeout) {
2328 if (sdp->type != TYPE_MOD)
2329 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2331 blk_queue_rq_timeout(sdp->request_queue,
2335 device_initialize(&sdkp->dev);
2336 sdkp->dev.parent = &sdp->sdev_gendev;
2337 sdkp->dev.class = &sd_disk_class;
2338 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2340 if (device_add(&sdkp->dev))
2341 goto out_free_index;
2343 get_device(&sdp->sdev_gendev);
2345 get_device(&sdkp->dev); /* prevent release before async_schedule */
2346 async_schedule(sd_probe_async, sdkp);
2351 spin_lock(&sd_index_lock);
2352 ida_remove(&sd_index_ida, index);
2353 spin_unlock(&sd_index_lock);
2363 * sd_remove - called whenever a scsi disk (previously recognized by
2364 * sd_probe) is detached from the system. It is called (potentially
2365 * multiple times) during sd module unload.
2366 * @sdp: pointer to mid level scsi device object
2368 * Note: this function is invoked from the scsi mid-level.
2369 * This function potentially frees up a device name (e.g. /dev/sdc)
2370 * that could be re-used by a subsequent sd_probe().
2371 * This function is not called when the built-in sd driver is "exit-ed".
2373 static int sd_remove(struct device *dev)
2375 struct scsi_disk *sdkp;
2377 async_synchronize_full();
2378 sdkp = dev_get_drvdata(dev);
2379 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2380 device_del(&sdkp->dev);
2381 del_gendisk(sdkp->disk);
2384 mutex_lock(&sd_ref_mutex);
2385 dev_set_drvdata(dev, NULL);
2386 put_device(&sdkp->dev);
2387 mutex_unlock(&sd_ref_mutex);
2393 * scsi_disk_release - Called to free the scsi_disk structure
2394 * @dev: pointer to embedded class device
2396 * sd_ref_mutex must be held entering this routine. Because it is
2397 * called on last put, you should always use the scsi_disk_get()
2398 * scsi_disk_put() helpers which manipulate the semaphore directly
2399 * and never do a direct put_device.
2401 static void scsi_disk_release(struct device *dev)
2403 struct scsi_disk *sdkp = to_scsi_disk(dev);
2404 struct gendisk *disk = sdkp->disk;
2406 spin_lock(&sd_index_lock);
2407 ida_remove(&sd_index_ida, sdkp->index);
2408 spin_unlock(&sd_index_lock);
2410 disk->private_data = NULL;
2412 put_device(&sdkp->device->sdev_gendev);
2417 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2419 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2420 struct scsi_sense_hdr sshdr;
2421 struct scsi_device *sdp = sdkp->device;
2425 cmd[4] |= 1; /* START */
2427 if (sdp->start_stop_pwr_cond)
2428 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2430 if (!scsi_device_online(sdp))
2433 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2434 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2436 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2437 sd_print_result(sdkp, res);
2438 if (driver_byte(res) & DRIVER_SENSE)
2439 sd_print_sense_hdr(sdkp, &sshdr);
2446 * Send a SYNCHRONIZE CACHE instruction down to the device through
2447 * the normal SCSI command structure. Wait for the command to
2450 static void sd_shutdown(struct device *dev)
2452 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2455 return; /* this can happen */
2458 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2459 sd_sync_cache(sdkp);
2462 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2463 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2464 sd_start_stop_device(sdkp, 0);
2467 scsi_disk_put(sdkp);
2470 static int sd_suspend(struct device *dev, pm_message_t mesg)
2472 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2476 return 0; /* this can happen */
2479 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2480 ret = sd_sync_cache(sdkp);
2485 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2486 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2487 ret = sd_start_stop_device(sdkp, 0);
2491 scsi_disk_put(sdkp);
2495 static int sd_resume(struct device *dev)
2497 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2500 if (!sdkp->device->manage_start_stop)
2503 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2504 ret = sd_start_stop_device(sdkp, 1);
2507 scsi_disk_put(sdkp);
2512 * init_sd - entry point for this driver (both when built in or when
2515 * Note: this function registers this driver with the scsi mid-level.
2517 static int __init init_sd(void)
2519 int majors = 0, i, err;
2521 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2523 for (i = 0; i < SD_MAJORS; i++)
2524 if (register_blkdev(sd_major(i), "sd") == 0)
2530 err = class_register(&sd_disk_class);
2534 err = scsi_register_driver(&sd_template.gendrv);
2538 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2540 if (!sd_cdb_cache) {
2541 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2545 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2547 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2554 kmem_cache_destroy(sd_cdb_cache);
2557 class_unregister(&sd_disk_class);
2559 for (i = 0; i < SD_MAJORS; i++)
2560 unregister_blkdev(sd_major(i), "sd");
2565 * exit_sd - exit point for this driver (when it is a module).
2567 * Note: this function unregisters this driver from the scsi mid-level.
2569 static void __exit exit_sd(void)
2573 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2575 mempool_destroy(sd_cdb_pool);
2576 kmem_cache_destroy(sd_cdb_cache);
2578 scsi_unregister_driver(&sd_template.gendrv);
2579 class_unregister(&sd_disk_class);
2581 for (i = 0; i < SD_MAJORS; i++)
2582 unregister_blkdev(sd_major(i), "sd");
2585 module_init(init_sd);
2586 module_exit(exit_sd);
2588 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2589 struct scsi_sense_hdr *sshdr)
2591 sd_printk(KERN_INFO, sdkp, "");
2592 scsi_show_sense_hdr(sshdr);
2593 sd_printk(KERN_INFO, sdkp, "");
2594 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2597 static void sd_print_result(struct scsi_disk *sdkp, int result)
2599 sd_printk(KERN_INFO, sdkp, "");
2600 scsi_show_result(result);