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);
431 if (sdkp->device->sector_size == 4096) {
436 rq->cmd_type = REQ_TYPE_BLOCK_PC;
437 rq->timeout = SD_TIMEOUT;
439 memset(rq->cmd, 0, rq->cmd_len);
441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
443 return BLKPREP_DEFER;
446 char *buf = page_address(page);
452 put_unaligned_be16(6 + 16, &buf[0]);
453 put_unaligned_be16(16, &buf[2]);
454 put_unaligned_be64(sector, &buf[8]);
455 put_unaligned_be32(nr_sectors, &buf[16]);
460 rq->cmd[0] = WRITE_SAME_16;
461 rq->cmd[1] = 0x8; /* UNMAP */
462 put_unaligned_be64(sector, &rq->cmd[2]);
463 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
465 len = sdkp->device->sector_size;
468 blk_add_request_payload(rq, page, len);
469 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
470 rq->buffer = page_address(page);
471 if (ret != BLKPREP_OK) {
478 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
480 /* for now, we use REQ_TYPE_BLOCK_PC. */
481 rq->cmd_type = REQ_TYPE_BLOCK_PC;
482 rq->timeout = SD_TIMEOUT;
483 rq->retries = SD_MAX_RETRIES;
484 rq->cmd[0] = SYNCHRONIZE_CACHE;
487 return scsi_setup_blk_pc_cmnd(sdp, rq);
490 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
492 if (rq->cmd_flags & REQ_DISCARD) {
493 free_page((unsigned long)rq->buffer);
499 * sd_init_command - build a scsi (read or write) command from
500 * information in the request structure.
501 * @SCpnt: pointer to mid-level's per scsi command structure that
502 * contains request and into which the scsi command is written
504 * Returns 1 if successful and 0 if error (or cannot be done now).
506 static int sd_prep_fn(struct request_queue *q, struct request *rq)
508 struct scsi_cmnd *SCpnt;
509 struct scsi_device *sdp = q->queuedata;
510 struct gendisk *disk = rq->rq_disk;
511 struct scsi_disk *sdkp;
512 sector_t block = blk_rq_pos(rq);
514 unsigned int this_count = blk_rq_sectors(rq);
516 unsigned char protect;
519 * Discard request come in as REQ_TYPE_FS but we turn them into
520 * block PC requests to make life easier.
522 if (rq->cmd_flags & REQ_DISCARD) {
523 ret = scsi_setup_discard_cmnd(sdp, rq);
525 } else if (rq->cmd_flags & REQ_FLUSH) {
526 ret = scsi_setup_flush_cmnd(sdp, rq);
528 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
529 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
531 } else if (rq->cmd_type != REQ_TYPE_FS) {
535 ret = scsi_setup_fs_cmnd(sdp, rq);
536 if (ret != BLKPREP_OK)
539 sdkp = scsi_disk(disk);
541 /* from here on until we're complete, any goto out
542 * is used for a killable error condition */
545 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
546 "sd_init_command: block=%llu, "
548 (unsigned long long)block,
551 if (!sdp || !scsi_device_online(sdp) ||
552 block + blk_rq_sectors(rq) > get_capacity(disk)) {
553 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
554 "Finishing %u sectors\n",
555 blk_rq_sectors(rq)));
556 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
557 "Retry with 0x%p\n", SCpnt));
563 * quietly refuse to do anything to a changed disc until
564 * the changed bit has been reset
566 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
571 * Some SD card readers can't handle multi-sector accesses which touch
572 * the last one or two hardware sectors. Split accesses as needed.
574 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
575 (sdp->sector_size / 512);
577 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
578 if (block < threshold) {
579 /* Access up to the threshold but not beyond */
580 this_count = threshold - block;
582 /* Access only a single hardware sector */
583 this_count = sdp->sector_size / 512;
587 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
588 (unsigned long long)block));
591 * If we have a 1K hardware sectorsize, prevent access to single
592 * 512 byte sectors. In theory we could handle this - in fact
593 * the scsi cdrom driver must be able to handle this because
594 * we typically use 1K blocksizes, and cdroms typically have
595 * 2K hardware sectorsizes. Of course, things are simpler
596 * with the cdrom, since it is read-only. For performance
597 * reasons, the filesystems should be able to handle this
598 * and not force the scsi disk driver to use bounce buffers
601 if (sdp->sector_size == 1024) {
602 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
603 scmd_printk(KERN_ERR, SCpnt,
604 "Bad block number requested\n");
608 this_count = this_count >> 1;
611 if (sdp->sector_size == 2048) {
612 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
613 scmd_printk(KERN_ERR, SCpnt,
614 "Bad block number requested\n");
618 this_count = this_count >> 2;
621 if (sdp->sector_size == 4096) {
622 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
623 scmd_printk(KERN_ERR, SCpnt,
624 "Bad block number requested\n");
628 this_count = this_count >> 3;
631 if (rq_data_dir(rq) == WRITE) {
632 if (!sdp->writeable) {
635 SCpnt->cmnd[0] = WRITE_6;
636 SCpnt->sc_data_direction = DMA_TO_DEVICE;
638 if (blk_integrity_rq(rq) &&
639 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
642 } else if (rq_data_dir(rq) == READ) {
643 SCpnt->cmnd[0] = READ_6;
644 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
646 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
650 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
651 "%s %d/%u 512 byte blocks.\n",
652 (rq_data_dir(rq) == WRITE) ?
653 "writing" : "reading", this_count,
654 blk_rq_sectors(rq)));
656 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
657 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
663 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
664 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
666 if (unlikely(SCpnt->cmnd == NULL)) {
671 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
672 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
673 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
674 SCpnt->cmnd[7] = 0x18;
675 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
676 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
679 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
680 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
681 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
682 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
683 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
684 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
685 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
686 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
688 /* Expected Indirect LBA */
689 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
690 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
691 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
692 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
694 /* Transfer length */
695 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
696 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
697 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
698 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
699 } else if (block > 0xffffffff) {
700 SCpnt->cmnd[0] += READ_16 - READ_6;
701 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
702 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
703 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
704 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
705 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
706 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
707 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
708 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
709 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
710 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
711 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
712 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
713 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
714 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
715 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
716 scsi_device_protection(SCpnt->device) ||
717 SCpnt->device->use_10_for_rw) {
718 if (this_count > 0xffff)
721 SCpnt->cmnd[0] += READ_10 - READ_6;
722 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
723 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
724 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
725 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
726 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
727 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
728 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
729 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
731 if (unlikely(rq->cmd_flags & REQ_FUA)) {
733 * This happens only if this drive failed
734 * 10byte rw command with ILLEGAL_REQUEST
735 * during operation and thus turned off
738 scmd_printk(KERN_ERR, SCpnt,
739 "FUA write on READ/WRITE(6) drive\n");
743 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
744 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
745 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
746 SCpnt->cmnd[4] = (unsigned char) this_count;
749 SCpnt->sdb.length = this_count * sdp->sector_size;
751 /* If DIF or DIX is enabled, tell HBA how to handle request */
752 if (host_dif || scsi_prot_sg_count(SCpnt))
753 sd_prot_op(SCpnt, host_dif);
756 * We shouldn't disconnect in the middle of a sector, so with a dumb
757 * host adapter, it's safe to assume that we can at least transfer
758 * this many bytes between each connect / disconnect.
760 SCpnt->transfersize = sdp->sector_size;
761 SCpnt->underflow = this_count << 9;
762 SCpnt->allowed = SD_MAX_RETRIES;
765 * This indicates that the command is ready from our end to be
770 return scsi_prep_return(q, rq, ret);
774 * sd_open - open a scsi disk device
775 * @inode: only i_rdev member may be used
776 * @filp: only f_mode and f_flags may be used
778 * Returns 0 if successful. Returns a negated errno value in case
781 * Note: This can be called from a user context (e.g. fsck(1) )
782 * or from within the kernel (e.g. as a result of a mount(1) ).
783 * In the latter case @inode and @filp carry an abridged amount
784 * of information as noted above.
786 static int sd_open(struct block_device *bdev, fmode_t mode)
788 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
789 struct scsi_device *sdev;
795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
800 * If the device is in error recovery, wait until it is done.
801 * If the device is offline, then disallow any access to it.
804 if (!scsi_block_when_processing_errors(sdev))
807 if (sdev->removable || sdkp->write_prot)
808 check_disk_change(bdev);
811 * If the drive is empty, just let the open fail.
814 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
818 * If the device has the write protect tab set, have the open fail
819 * if the user expects to be able to write to the thing.
822 if (sdkp->write_prot && (mode & FMODE_WRITE))
826 * It is possible that the disk changing stuff resulted in
827 * the device being taken offline. If this is the case,
828 * report this to the user, and don't pretend that the
829 * open actually succeeded.
832 if (!scsi_device_online(sdev))
835 if (!sdkp->openers++ && sdev->removable) {
836 if (scsi_block_when_processing_errors(sdev))
837 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
848 * sd_release - invoked when the (last) close(2) is called on this
850 * @inode: only i_rdev member may be used
851 * @filp: only f_mode and f_flags may be used
855 * Note: may block (uninterruptible) if error recovery is underway
858 static int sd_release(struct gendisk *disk, fmode_t mode)
860 struct scsi_disk *sdkp = scsi_disk(disk);
861 struct scsi_device *sdev = sdkp->device;
863 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
865 if (!--sdkp->openers && sdev->removable) {
866 if (scsi_block_when_processing_errors(sdev))
867 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
871 * XXX and what if there are packets in flight and this close()
872 * XXX is followed by a "rmmod sd_mod"?
878 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
880 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
881 struct scsi_device *sdp = sdkp->device;
882 struct Scsi_Host *host = sdp->host;
885 /* default to most commonly used values */
886 diskinfo[0] = 0x40; /* 1 << 6 */
887 diskinfo[1] = 0x20; /* 1 << 5 */
888 diskinfo[2] = sdkp->capacity >> 11;
890 /* override with calculated, extended default, or driver values */
891 if (host->hostt->bios_param)
892 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
894 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
896 geo->heads = diskinfo[0];
897 geo->sectors = diskinfo[1];
898 geo->cylinders = diskinfo[2];
903 * sd_ioctl - process an ioctl
904 * @inode: only i_rdev/i_bdev members may be used
905 * @filp: only f_mode and f_flags may be used
906 * @cmd: ioctl command number
907 * @arg: this is third argument given to ioctl(2) system call.
908 * Often contains a pointer.
910 * Returns 0 if successful (some ioctls return postive numbers on
911 * success as well). Returns a negated errno value in case of error.
913 * Note: most ioctls are forward onto the block subsystem or further
914 * down in the scsi subsystem.
916 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
917 unsigned int cmd, unsigned long arg)
919 struct gendisk *disk = bdev->bd_disk;
920 struct scsi_device *sdp = scsi_disk(disk)->device;
921 void __user *p = (void __user *)arg;
924 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
925 disk->disk_name, cmd));
928 * If we are in the middle of error recovery, don't let anyone
929 * else try and use this device. Also, if error recovery fails, it
930 * may try and take the device offline, in which case all further
931 * access to the device is prohibited.
933 error = scsi_nonblockable_ioctl(sdp, cmd, p,
934 (mode & FMODE_NDELAY) != 0);
935 if (!scsi_block_when_processing_errors(sdp) || !error)
939 * Send SCSI addressing ioctls directly to mid level, send other
940 * ioctls to block level and then onto mid level if they can't be
944 case SCSI_IOCTL_GET_IDLUN:
945 case SCSI_IOCTL_GET_BUS_NUMBER:
946 return scsi_ioctl(sdp, cmd, p);
948 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
949 if (error != -ENOTTY)
952 return scsi_ioctl(sdp, cmd, p);
955 static void set_media_not_present(struct scsi_disk *sdkp)
957 sdkp->media_present = 0;
959 sdkp->device->changed = 1;
963 * sd_media_changed - check if our medium changed
964 * @disk: kernel device descriptor
966 * Returns 0 if not applicable or no change; 1 if change
968 * Note: this function is invoked from the block subsystem.
970 static int sd_media_changed(struct gendisk *disk)
972 struct scsi_disk *sdkp = scsi_disk(disk);
973 struct scsi_device *sdp = sdkp->device;
974 struct scsi_sense_hdr *sshdr = NULL;
977 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
983 * If the device is offline, don't send any commands - just pretend as
984 * if the command failed. If the device ever comes back online, we
985 * can deal with it then. It is only because of unrecoverable errors
986 * that we would ever take a device offline in the first place.
988 if (!scsi_device_online(sdp)) {
989 set_media_not_present(sdkp);
995 * Using TEST_UNIT_READY enables differentiation between drive with
996 * no cartridge loaded - NOT READY, drive with changed cartridge -
997 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
999 * Drives that auto spin down. eg iomega jaz 1G, will be started
1000 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1001 * sd_revalidate() is called.
1005 if (scsi_block_when_processing_errors(sdp)) {
1006 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1007 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1012 * Unable to test, unit probably not ready. This usually
1013 * means there is no disc in the drive. Mark as changed,
1014 * and we will figure it out later once the drive is
1017 if (retval || (scsi_sense_valid(sshdr) &&
1018 /* 0x3a is medium not present */
1019 sshdr->asc == 0x3a)) {
1020 set_media_not_present(sdkp);
1026 * For removable scsi disk we have to recognise the presence
1027 * of a disk in the drive. This is kept in the struct scsi_disk
1028 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1030 sdkp->media_present = 1;
1032 retval = sdp->changed;
1035 if (retval != sdkp->previous_state)
1036 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1037 sdkp->previous_state = retval;
1042 static int sd_sync_cache(struct scsi_disk *sdkp)
1045 struct scsi_device *sdp = sdkp->device;
1046 struct scsi_sense_hdr sshdr;
1048 if (!scsi_device_online(sdp))
1052 for (retries = 3; retries > 0; --retries) {
1053 unsigned char cmd[10] = { 0 };
1055 cmd[0] = SYNCHRONIZE_CACHE;
1057 * Leave the rest of the command zero to indicate
1060 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1061 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1067 sd_print_result(sdkp, res);
1068 if (driver_byte(res) & DRIVER_SENSE)
1069 sd_print_sense_hdr(sdkp, &sshdr);
1077 static void sd_rescan(struct device *dev)
1079 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1082 revalidate_disk(sdkp->disk);
1083 scsi_disk_put(sdkp);
1088 #ifdef CONFIG_COMPAT
1090 * This gets directly called from VFS. When the ioctl
1091 * is not recognized we go back to the other translation paths.
1093 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1094 unsigned int cmd, unsigned long arg)
1096 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1099 * If we are in the middle of error recovery, don't let anyone
1100 * else try and use this device. Also, if error recovery fails, it
1101 * may try and take the device offline, in which case all further
1102 * access to the device is prohibited.
1104 if (!scsi_block_when_processing_errors(sdev))
1107 if (sdev->host->hostt->compat_ioctl) {
1110 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1116 * Let the static ioctl translation table take care of it.
1118 return -ENOIOCTLCMD;
1122 static const struct block_device_operations sd_fops = {
1123 .owner = THIS_MODULE,
1125 .release = sd_release,
1126 .locked_ioctl = sd_ioctl,
1127 .getgeo = sd_getgeo,
1128 #ifdef CONFIG_COMPAT
1129 .compat_ioctl = sd_compat_ioctl,
1131 .media_changed = sd_media_changed,
1132 .revalidate_disk = sd_revalidate_disk,
1133 .unlock_native_capacity = sd_unlock_native_capacity,
1136 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1138 u64 start_lba = blk_rq_pos(scmd->request);
1139 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1143 if (scmd->request->cmd_type != REQ_TYPE_FS)
1146 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1147 SCSI_SENSE_BUFFERSIZE,
1152 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1155 if (scmd->device->sector_size < 512) {
1156 /* only legitimate sector_size here is 256 */
1160 /* be careful ... don't want any overflows */
1161 u64 factor = scmd->device->sector_size / 512;
1162 do_div(start_lba, factor);
1163 do_div(end_lba, factor);
1166 /* The bad lba was reported incorrectly, we have no idea where
1169 if (bad_lba < start_lba || bad_lba >= end_lba)
1172 /* This computation should always be done in terms of
1173 * the resolution of the device's medium.
1175 return (bad_lba - start_lba) * scmd->device->sector_size;
1179 * sd_done - bottom half handler: called when the lower level
1180 * driver has completed (successfully or otherwise) a scsi command.
1181 * @SCpnt: mid-level's per command structure.
1183 * Note: potentially run from within an ISR. Must not block.
1185 static int sd_done(struct scsi_cmnd *SCpnt)
1187 int result = SCpnt->result;
1188 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1189 struct scsi_sense_hdr sshdr;
1190 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1191 int sense_valid = 0;
1192 int sense_deferred = 0;
1195 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1197 sense_deferred = scsi_sense_is_deferred(&sshdr);
1199 #ifdef CONFIG_SCSI_LOGGING
1200 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1202 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1203 "sd_done: sb[respc,sk,asc,"
1204 "ascq]=%x,%x,%x,%x\n",
1205 sshdr.response_code,
1206 sshdr.sense_key, sshdr.asc,
1210 if (driver_byte(result) != DRIVER_SENSE &&
1211 (!sense_valid || sense_deferred))
1214 switch (sshdr.sense_key) {
1215 case HARDWARE_ERROR:
1217 good_bytes = sd_completed_bytes(SCpnt);
1219 case RECOVERED_ERROR:
1220 good_bytes = scsi_bufflen(SCpnt);
1223 /* This indicates a false check condition, so ignore it. An
1224 * unknown amount of data was transferred so treat it as an
1227 scsi_print_sense("sd", SCpnt);
1229 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1231 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1232 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1233 if (sshdr.asc == 0x10)
1234 good_bytes = sd_completed_bytes(SCpnt);
1240 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1241 sd_dif_complete(SCpnt, good_bytes);
1243 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1244 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1246 /* We have to print a failed command here as the
1247 * extended CDB gets freed before scsi_io_completion()
1251 scsi_print_command(SCpnt);
1253 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1261 static int media_not_present(struct scsi_disk *sdkp,
1262 struct scsi_sense_hdr *sshdr)
1265 if (!scsi_sense_valid(sshdr))
1267 /* not invoked for commands that could return deferred errors */
1268 if (sshdr->sense_key != NOT_READY &&
1269 sshdr->sense_key != UNIT_ATTENTION)
1271 if (sshdr->asc != 0x3A) /* medium not present */
1274 set_media_not_present(sdkp);
1279 * spinup disk - called only in sd_revalidate_disk()
1282 sd_spinup_disk(struct scsi_disk *sdkp)
1284 unsigned char cmd[10];
1285 unsigned long spintime_expire = 0;
1286 int retries, spintime;
1287 unsigned int the_result;
1288 struct scsi_sense_hdr sshdr;
1289 int sense_valid = 0;
1293 /* Spin up drives, as required. Only do this at boot time */
1294 /* Spinup needs to be done for module loads too. */
1299 cmd[0] = TEST_UNIT_READY;
1300 memset((void *) &cmd[1], 0, 9);
1302 the_result = scsi_execute_req(sdkp->device, cmd,
1305 SD_MAX_RETRIES, NULL);
1308 * If the drive has indicated to us that it
1309 * doesn't have any media in it, don't bother
1310 * with any more polling.
1312 if (media_not_present(sdkp, &sshdr))
1316 sense_valid = scsi_sense_valid(&sshdr);
1318 } while (retries < 3 &&
1319 (!scsi_status_is_good(the_result) ||
1320 ((driver_byte(the_result) & DRIVER_SENSE) &&
1321 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1323 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1324 /* no sense, TUR either succeeded or failed
1325 * with a status error */
1326 if(!spintime && !scsi_status_is_good(the_result)) {
1327 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1328 sd_print_result(sdkp, the_result);
1334 * The device does not want the automatic start to be issued.
1336 if (sdkp->device->no_start_on_add)
1339 if (sense_valid && sshdr.sense_key == NOT_READY) {
1340 if (sshdr.asc == 4 && sshdr.ascq == 3)
1341 break; /* manual intervention required */
1342 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1343 break; /* standby */
1344 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1345 break; /* unavailable */
1347 * Issue command to spin up drive when not ready
1350 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1351 cmd[0] = START_STOP;
1352 cmd[1] = 1; /* Return immediately */
1353 memset((void *) &cmd[2], 0, 8);
1354 cmd[4] = 1; /* Start spin cycle */
1355 if (sdkp->device->start_stop_pwr_cond)
1357 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1359 SD_TIMEOUT, SD_MAX_RETRIES,
1361 spintime_expire = jiffies + 100 * HZ;
1364 /* Wait 1 second for next try */
1369 * Wait for USB flash devices with slow firmware.
1370 * Yes, this sense key/ASC combination shouldn't
1371 * occur here. It's characteristic of these devices.
1373 } else if (sense_valid &&
1374 sshdr.sense_key == UNIT_ATTENTION &&
1375 sshdr.asc == 0x28) {
1377 spintime_expire = jiffies + 5 * HZ;
1380 /* Wait 1 second for next try */
1383 /* we don't understand the sense code, so it's
1384 * probably pointless to loop */
1386 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1387 sd_print_sense_hdr(sdkp, &sshdr);
1392 } while (spintime && time_before_eq(jiffies, spintime_expire));
1395 if (scsi_status_is_good(the_result))
1398 printk("not responding...\n");
1404 * Determine whether disk supports Data Integrity Field.
1406 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1408 struct scsi_device *sdp = sdkp->device;
1411 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1414 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1416 if (type == sdkp->protection_type || !sdkp->first_scan)
1419 sdkp->protection_type = type;
1421 if (type > SD_DIF_TYPE3_PROTECTION) {
1422 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1423 "protection type %u. Disabling disk!\n", type);
1428 if (scsi_host_dif_capable(sdp->host, type))
1429 sd_printk(KERN_NOTICE, sdkp,
1430 "Enabling DIF Type %u protection\n", type);
1432 sd_printk(KERN_NOTICE, sdkp,
1433 "Disabling DIF Type %u protection\n", type);
1436 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1437 struct scsi_sense_hdr *sshdr, int sense_valid,
1440 sd_print_result(sdkp, the_result);
1441 if (driver_byte(the_result) & DRIVER_SENSE)
1442 sd_print_sense_hdr(sdkp, sshdr);
1444 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1447 * Set dirty bit for removable devices if not ready -
1448 * sometimes drives will not report this properly.
1450 if (sdp->removable &&
1451 sense_valid && sshdr->sense_key == NOT_READY)
1455 * We used to set media_present to 0 here to indicate no media
1456 * in the drive, but some drives fail read capacity even with
1457 * media present, so we can't do that.
1459 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1463 #if RC16_LEN > SD_BUF_SIZE
1464 #error RC16_LEN must not be more than SD_BUF_SIZE
1467 #define READ_CAPACITY_RETRIES_ON_RESET 10
1469 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1470 unsigned char *buffer)
1472 unsigned char cmd[16];
1473 struct scsi_sense_hdr sshdr;
1474 int sense_valid = 0;
1476 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1477 unsigned int alignment;
1478 unsigned long long lba;
1479 unsigned sector_size;
1483 cmd[0] = SERVICE_ACTION_IN;
1484 cmd[1] = SAI_READ_CAPACITY_16;
1486 memset(buffer, 0, RC16_LEN);
1488 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1489 buffer, RC16_LEN, &sshdr,
1490 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1492 if (media_not_present(sdkp, &sshdr))
1496 sense_valid = scsi_sense_valid(&sshdr);
1498 sshdr.sense_key == ILLEGAL_REQUEST &&
1499 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1501 /* Invalid Command Operation Code or
1502 * Invalid Field in CDB, just retry
1503 * silently with RC10 */
1506 sshdr.sense_key == UNIT_ATTENTION &&
1507 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1508 /* Device reset might occur several times,
1509 * give it one more chance */
1510 if (--reset_retries > 0)
1515 } while (the_result && retries);
1518 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1519 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1523 sector_size = get_unaligned_be32(&buffer[8]);
1524 lba = get_unaligned_be64(&buffer[0]);
1526 sd_read_protection_type(sdkp, buffer);
1528 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1529 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1530 "kernel compiled with support for large block "
1536 /* Logical blocks per physical block exponent */
1537 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1539 /* Lowest aligned logical block */
1540 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1541 blk_queue_alignment_offset(sdp->request_queue, alignment);
1542 if (alignment && sdkp->first_scan)
1543 sd_printk(KERN_NOTICE, sdkp,
1544 "physical block alignment offset: %u\n", alignment);
1546 if (buffer[14] & 0x80) { /* TPE */
1547 struct request_queue *q = sdp->request_queue;
1549 sdkp->thin_provisioning = 1;
1550 q->limits.discard_granularity = sdkp->hw_sector_size;
1551 q->limits.max_discard_sectors = 0xffffffff;
1553 if (buffer[14] & 0x40) /* TPRZ */
1554 q->limits.discard_zeroes_data = 1;
1556 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1559 sdkp->capacity = lba + 1;
1563 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1564 unsigned char *buffer)
1566 unsigned char cmd[16];
1567 struct scsi_sense_hdr sshdr;
1568 int sense_valid = 0;
1570 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1572 unsigned sector_size;
1575 cmd[0] = READ_CAPACITY;
1576 memset(&cmd[1], 0, 9);
1577 memset(buffer, 0, 8);
1579 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1581 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1583 if (media_not_present(sdkp, &sshdr))
1587 sense_valid = scsi_sense_valid(&sshdr);
1589 sshdr.sense_key == UNIT_ATTENTION &&
1590 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1591 /* Device reset might occur several times,
1592 * give it one more chance */
1593 if (--reset_retries > 0)
1598 } while (the_result && retries);
1601 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1602 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1606 sector_size = get_unaligned_be32(&buffer[4]);
1607 lba = get_unaligned_be32(&buffer[0]);
1609 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1610 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1611 "kernel compiled with support for large block "
1617 sdkp->capacity = lba + 1;
1618 sdkp->hw_sector_size = sector_size;
1622 static int sd_try_rc16_first(struct scsi_device *sdp)
1624 if (sdp->host->max_cmd_len < 16)
1626 if (sdp->scsi_level > SCSI_SPC_2)
1628 if (scsi_device_protection(sdp))
1634 * read disk capacity
1637 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1640 struct scsi_device *sdp = sdkp->device;
1641 sector_t old_capacity = sdkp->capacity;
1643 if (sd_try_rc16_first(sdp)) {
1644 sector_size = read_capacity_16(sdkp, sdp, buffer);
1645 if (sector_size == -EOVERFLOW)
1647 if (sector_size == -ENODEV)
1649 if (sector_size < 0)
1650 sector_size = read_capacity_10(sdkp, sdp, buffer);
1651 if (sector_size < 0)
1654 sector_size = read_capacity_10(sdkp, sdp, buffer);
1655 if (sector_size == -EOVERFLOW)
1657 if (sector_size < 0)
1659 if ((sizeof(sdkp->capacity) > 4) &&
1660 (sdkp->capacity > 0xffffffffULL)) {
1661 int old_sector_size = sector_size;
1662 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1663 "Trying to use READ CAPACITY(16).\n");
1664 sector_size = read_capacity_16(sdkp, sdp, buffer);
1665 if (sector_size < 0) {
1666 sd_printk(KERN_NOTICE, sdkp,
1667 "Using 0xffffffff as device size\n");
1668 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1669 sector_size = old_sector_size;
1675 /* Some devices are known to return the total number of blocks,
1676 * not the highest block number. Some devices have versions
1677 * which do this and others which do not. Some devices we might
1678 * suspect of doing this but we don't know for certain.
1680 * If we know the reported capacity is wrong, decrement it. If
1681 * we can only guess, then assume the number of blocks is even
1682 * (usually true but not always) and err on the side of lowering
1685 if (sdp->fix_capacity ||
1686 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1687 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1688 "from its reported value: %llu\n",
1689 (unsigned long long) sdkp->capacity);
1694 if (sector_size == 0) {
1696 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1700 if (sector_size != 512 &&
1701 sector_size != 1024 &&
1702 sector_size != 2048 &&
1703 sector_size != 4096 &&
1704 sector_size != 256) {
1705 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1708 * The user might want to re-format the drive with
1709 * a supported sectorsize. Once this happens, it
1710 * would be relatively trivial to set the thing up.
1711 * For this reason, we leave the thing in the table.
1715 * set a bogus sector size so the normal read/write
1716 * logic in the block layer will eventually refuse any
1717 * request on this device without tripping over power
1718 * of two sector size assumptions
1722 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1725 char cap_str_2[10], cap_str_10[10];
1726 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1728 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1730 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1731 sizeof(cap_str_10));
1733 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1734 sd_printk(KERN_NOTICE, sdkp,
1735 "%llu %d-byte logical blocks: (%s/%s)\n",
1736 (unsigned long long)sdkp->capacity,
1737 sector_size, cap_str_10, cap_str_2);
1739 if (sdkp->hw_sector_size != sector_size)
1740 sd_printk(KERN_NOTICE, sdkp,
1741 "%u-byte physical blocks\n",
1742 sdkp->hw_sector_size);
1746 /* Rescale capacity to 512-byte units */
1747 if (sector_size == 4096)
1748 sdkp->capacity <<= 3;
1749 else if (sector_size == 2048)
1750 sdkp->capacity <<= 2;
1751 else if (sector_size == 1024)
1752 sdkp->capacity <<= 1;
1753 else if (sector_size == 256)
1754 sdkp->capacity >>= 1;
1756 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1757 sdkp->device->sector_size = sector_size;
1760 /* called with buffer of length 512 */
1762 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1763 unsigned char *buffer, int len, struct scsi_mode_data *data,
1764 struct scsi_sense_hdr *sshdr)
1766 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1767 SD_TIMEOUT, SD_MAX_RETRIES, data,
1772 * read write protect setting, if possible - called only in sd_revalidate_disk()
1773 * called with buffer of length SD_BUF_SIZE
1776 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1779 struct scsi_device *sdp = sdkp->device;
1780 struct scsi_mode_data data;
1781 int old_wp = sdkp->write_prot;
1783 set_disk_ro(sdkp->disk, 0);
1784 if (sdp->skip_ms_page_3f) {
1785 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1789 if (sdp->use_192_bytes_for_3f) {
1790 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1793 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1794 * We have to start carefully: some devices hang if we ask
1795 * for more than is available.
1797 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1800 * Second attempt: ask for page 0 When only page 0 is
1801 * implemented, a request for page 3F may return Sense Key
1802 * 5: Illegal Request, Sense Code 24: Invalid field in
1805 if (!scsi_status_is_good(res))
1806 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1809 * Third attempt: ask 255 bytes, as we did earlier.
1811 if (!scsi_status_is_good(res))
1812 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1816 if (!scsi_status_is_good(res)) {
1817 sd_printk(KERN_WARNING, sdkp,
1818 "Test WP failed, assume Write Enabled\n");
1820 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1821 set_disk_ro(sdkp->disk, sdkp->write_prot);
1822 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1823 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1824 sdkp->write_prot ? "on" : "off");
1825 sd_printk(KERN_DEBUG, sdkp,
1826 "Mode Sense: %02x %02x %02x %02x\n",
1827 buffer[0], buffer[1], buffer[2], buffer[3]);
1833 * sd_read_cache_type - called only from sd_revalidate_disk()
1834 * called with buffer of length SD_BUF_SIZE
1837 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1840 struct scsi_device *sdp = sdkp->device;
1844 struct scsi_mode_data data;
1845 struct scsi_sense_hdr sshdr;
1846 int old_wce = sdkp->WCE;
1847 int old_rcd = sdkp->RCD;
1848 int old_dpofua = sdkp->DPOFUA;
1850 if (sdp->skip_ms_page_8)
1853 if (sdp->type == TYPE_RBC) {
1861 /* cautiously ask */
1862 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1864 if (!scsi_status_is_good(res))
1867 if (!data.header_length) {
1869 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1872 /* that went OK, now ask for the proper length */
1876 * We're only interested in the first three bytes, actually.
1877 * But the data cache page is defined for the first 20.
1884 /* Take headers and block descriptors into account */
1885 len += data.header_length + data.block_descriptor_length;
1886 if (len > SD_BUF_SIZE)
1890 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1892 if (scsi_status_is_good(res)) {
1893 int offset = data.header_length + data.block_descriptor_length;
1895 if (offset >= SD_BUF_SIZE - 2) {
1896 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1900 if ((buffer[offset] & 0x3f) != modepage) {
1901 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1905 if (modepage == 8) {
1906 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1907 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1909 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1913 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1914 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1915 sd_printk(KERN_NOTICE, sdkp,
1916 "Uses READ/WRITE(6), disabling FUA\n");
1920 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1921 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1922 sd_printk(KERN_NOTICE, sdkp,
1923 "Write cache: %s, read cache: %s, %s\n",
1924 sdkp->WCE ? "enabled" : "disabled",
1925 sdkp->RCD ? "disabled" : "enabled",
1926 sdkp->DPOFUA ? "supports DPO and FUA"
1927 : "doesn't support DPO or FUA");
1933 if (scsi_sense_valid(&sshdr) &&
1934 sshdr.sense_key == ILLEGAL_REQUEST &&
1935 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1936 /* Invalid field in CDB */
1937 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1939 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1942 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1949 * The ATO bit indicates whether the DIF application tag is available
1950 * for use by the operating system.
1952 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1955 struct scsi_device *sdp = sdkp->device;
1956 struct scsi_mode_data data;
1957 struct scsi_sense_hdr sshdr;
1959 if (sdp->type != TYPE_DISK)
1962 if (sdkp->protection_type == 0)
1965 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1966 SD_MAX_RETRIES, &data, &sshdr);
1968 if (!scsi_status_is_good(res) || !data.header_length ||
1970 sd_printk(KERN_WARNING, sdkp,
1971 "getting Control mode page failed, assume no ATO\n");
1973 if (scsi_sense_valid(&sshdr))
1974 sd_print_sense_hdr(sdkp, &sshdr);
1979 offset = data.header_length + data.block_descriptor_length;
1981 if ((buffer[offset] & 0x3f) != 0x0a) {
1982 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1986 if ((buffer[offset + 5] & 0x80) == 0)
1995 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1996 * @disk: disk to query
1998 static void sd_read_block_limits(struct scsi_disk *sdkp)
2000 struct request_queue *q = sdkp->disk->queue;
2001 unsigned int sector_sz = sdkp->device->sector_size;
2002 const int vpd_len = 64;
2003 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2006 /* Block Limits VPD */
2007 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2010 blk_queue_io_min(sdkp->disk->queue,
2011 get_unaligned_be16(&buffer[6]) * sector_sz);
2012 blk_queue_io_opt(sdkp->disk->queue,
2013 get_unaligned_be32(&buffer[12]) * sector_sz);
2015 /* Thin provisioning enabled and page length indicates TP support */
2016 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2017 unsigned int lba_count, desc_count, granularity;
2019 lba_count = get_unaligned_be32(&buffer[20]);
2020 desc_count = get_unaligned_be32(&buffer[24]);
2023 q->limits.max_discard_sectors =
2024 lba_count * sector_sz >> 9;
2030 granularity = get_unaligned_be32(&buffer[28]);
2033 q->limits.discard_granularity = granularity * sector_sz;
2035 if (buffer[32] & 0x80)
2036 q->limits.discard_alignment =
2037 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2045 * sd_read_block_characteristics - Query block dev. characteristics
2046 * @disk: disk to query
2048 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2050 unsigned char *buffer;
2052 const int vpd_len = 64;
2054 buffer = kmalloc(vpd_len, GFP_KERNEL);
2057 /* Block Device Characteristics VPD */
2058 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2061 rot = get_unaligned_be16(&buffer[4]);
2064 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2070 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2073 * Although VPD inquiries can go to SCSI-2 type devices,
2074 * some USB ones crash on receiving them, and the pages
2075 * we currently ask for are for SPC-3 and beyond
2077 if (sdp->scsi_level > SCSI_SPC_2)
2083 * sd_revalidate_disk - called the first time a new disk is seen,
2084 * performs disk spin up, read_capacity, etc.
2085 * @disk: struct gendisk we care about
2087 static int sd_revalidate_disk(struct gendisk *disk)
2089 struct scsi_disk *sdkp = scsi_disk(disk);
2090 struct scsi_device *sdp = sdkp->device;
2091 unsigned char *buffer;
2094 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2095 "sd_revalidate_disk\n"));
2098 * If the device is offline, don't try and read capacity or any
2099 * of the other niceties.
2101 if (!scsi_device_online(sdp))
2104 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2106 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2107 "allocation failure.\n");
2111 sd_spinup_disk(sdkp);
2114 * Without media there is no reason to ask; moreover, some devices
2115 * react badly if we do.
2117 if (sdkp->media_present) {
2118 sd_read_capacity(sdkp, buffer);
2120 if (sd_try_extended_inquiry(sdp)) {
2121 sd_read_block_limits(sdkp);
2122 sd_read_block_characteristics(sdkp);
2125 sd_read_write_protect_flag(sdkp, buffer);
2126 sd_read_cache_type(sdkp, buffer);
2127 sd_read_app_tag_own(sdkp, buffer);
2130 sdkp->first_scan = 0;
2133 * We now have all cache related info, determine how we deal
2134 * with ordered requests. Note that as the current SCSI
2135 * dispatch function can alter request order, we cannot use
2136 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2139 ordered = sdkp->DPOFUA
2140 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2142 ordered = QUEUE_ORDERED_DRAIN;
2144 blk_queue_ordered(sdkp->disk->queue, ordered);
2146 set_capacity(disk, sdkp->capacity);
2154 * sd_unlock_native_capacity - unlock native capacity
2155 * @disk: struct gendisk to set capacity for
2157 * Block layer calls this function if it detects that partitions
2158 * on @disk reach beyond the end of the device. If the SCSI host
2159 * implements ->unlock_native_capacity() method, it's invoked to
2160 * give it a chance to adjust the device capacity.
2163 * Defined by block layer. Might sleep.
2165 static void sd_unlock_native_capacity(struct gendisk *disk)
2167 struct scsi_device *sdev = scsi_disk(disk)->device;
2169 if (sdev->host->hostt->unlock_native_capacity)
2170 sdev->host->hostt->unlock_native_capacity(sdev);
2174 * sd_format_disk_name - format disk name
2175 * @prefix: name prefix - ie. "sd" for SCSI disks
2176 * @index: index of the disk to format name for
2177 * @buf: output buffer
2178 * @buflen: length of the output buffer
2180 * SCSI disk names starts at sda. The 26th device is sdz and the
2181 * 27th is sdaa. The last one for two lettered suffix is sdzz
2182 * which is followed by sdaaa.
2184 * This is basically 26 base counting with one extra 'nil' entry
2185 * at the beginning from the second digit on and can be
2186 * determined using similar method as 26 base conversion with the
2187 * index shifted -1 after each digit is computed.
2193 * 0 on success, -errno on failure.
2195 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2197 const int base = 'z' - 'a' + 1;
2198 char *begin = buf + strlen(prefix);
2199 char *end = buf + buflen;
2209 *--p = 'a' + (index % unit);
2210 index = (index / unit) - 1;
2211 } while (index >= 0);
2213 memmove(begin, p, end - p);
2214 memcpy(buf, prefix, strlen(prefix));
2220 * The asynchronous part of sd_probe
2222 static void sd_probe_async(void *data, async_cookie_t cookie)
2224 struct scsi_disk *sdkp = data;
2225 struct scsi_device *sdp;
2232 index = sdkp->index;
2233 dev = &sdp->sdev_gendev;
2235 if (index < SD_MAX_DISKS) {
2236 gd->major = sd_major((index & 0xf0) >> 4);
2237 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2238 gd->minors = SD_MINORS;
2240 gd->fops = &sd_fops;
2241 gd->private_data = &sdkp->driver;
2242 gd->queue = sdkp->device->request_queue;
2244 /* defaults, until the device tells us otherwise */
2245 sdp->sector_size = 512;
2247 sdkp->media_present = 1;
2248 sdkp->write_prot = 0;
2252 sdkp->first_scan = 1;
2254 sd_revalidate_disk(gd);
2256 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2257 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2259 gd->driverfs_dev = &sdp->sdev_gendev;
2260 gd->flags = GENHD_FL_EXT_DEVT;
2262 gd->flags |= GENHD_FL_REMOVABLE;
2264 dev_set_drvdata(dev, sdkp);
2266 sd_dif_config_host(sdkp);
2268 sd_revalidate_disk(gd);
2270 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2271 sdp->removable ? "removable " : "");
2272 put_device(&sdkp->dev);
2276 * sd_probe - called during driver initialization and whenever a
2277 * new scsi device is attached to the system. It is called once
2278 * for each scsi device (not just disks) present.
2279 * @dev: pointer to device object
2281 * Returns 0 if successful (or not interested in this scsi device
2282 * (e.g. scanner)); 1 when there is an error.
2284 * Note: this function is invoked from the scsi mid-level.
2285 * This function sets up the mapping between a given
2286 * <host,channel,id,lun> (found in sdp) and new device name
2287 * (e.g. /dev/sda). More precisely it is the block device major
2288 * and minor number that is chosen here.
2290 * Assume sd_attach is not re-entrant (for time being)
2291 * Also think about sd_attach() and sd_remove() running coincidentally.
2293 static int sd_probe(struct device *dev)
2295 struct scsi_device *sdp = to_scsi_device(dev);
2296 struct scsi_disk *sdkp;
2302 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2305 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2309 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2313 gd = alloc_disk(SD_MINORS);
2318 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2321 spin_lock(&sd_index_lock);
2322 error = ida_get_new(&sd_index_ida, &index);
2323 spin_unlock(&sd_index_lock);
2324 } while (error == -EAGAIN);
2329 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2331 goto out_free_index;
2334 sdkp->driver = &sd_template;
2336 sdkp->index = index;
2338 sdkp->previous_state = 1;
2340 if (!sdp->request_queue->rq_timeout) {
2341 if (sdp->type != TYPE_MOD)
2342 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2344 blk_queue_rq_timeout(sdp->request_queue,
2348 device_initialize(&sdkp->dev);
2349 sdkp->dev.parent = &sdp->sdev_gendev;
2350 sdkp->dev.class = &sd_disk_class;
2351 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2353 if (device_add(&sdkp->dev))
2354 goto out_free_index;
2356 get_device(&sdp->sdev_gendev);
2358 get_device(&sdkp->dev); /* prevent release before async_schedule */
2359 async_schedule(sd_probe_async, sdkp);
2364 spin_lock(&sd_index_lock);
2365 ida_remove(&sd_index_ida, index);
2366 spin_unlock(&sd_index_lock);
2376 * sd_remove - called whenever a scsi disk (previously recognized by
2377 * sd_probe) is detached from the system. It is called (potentially
2378 * multiple times) during sd module unload.
2379 * @sdp: pointer to mid level scsi device object
2381 * Note: this function is invoked from the scsi mid-level.
2382 * This function potentially frees up a device name (e.g. /dev/sdc)
2383 * that could be re-used by a subsequent sd_probe().
2384 * This function is not called when the built-in sd driver is "exit-ed".
2386 static int sd_remove(struct device *dev)
2388 struct scsi_disk *sdkp;
2390 async_synchronize_full();
2391 sdkp = dev_get_drvdata(dev);
2392 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2393 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2394 device_del(&sdkp->dev);
2395 del_gendisk(sdkp->disk);
2398 mutex_lock(&sd_ref_mutex);
2399 dev_set_drvdata(dev, NULL);
2400 put_device(&sdkp->dev);
2401 mutex_unlock(&sd_ref_mutex);
2407 * scsi_disk_release - Called to free the scsi_disk structure
2408 * @dev: pointer to embedded class device
2410 * sd_ref_mutex must be held entering this routine. Because it is
2411 * called on last put, you should always use the scsi_disk_get()
2412 * scsi_disk_put() helpers which manipulate the semaphore directly
2413 * and never do a direct put_device.
2415 static void scsi_disk_release(struct device *dev)
2417 struct scsi_disk *sdkp = to_scsi_disk(dev);
2418 struct gendisk *disk = sdkp->disk;
2420 spin_lock(&sd_index_lock);
2421 ida_remove(&sd_index_ida, sdkp->index);
2422 spin_unlock(&sd_index_lock);
2424 disk->private_data = NULL;
2426 put_device(&sdkp->device->sdev_gendev);
2431 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2433 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2434 struct scsi_sense_hdr sshdr;
2435 struct scsi_device *sdp = sdkp->device;
2439 cmd[4] |= 1; /* START */
2441 if (sdp->start_stop_pwr_cond)
2442 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2444 if (!scsi_device_online(sdp))
2447 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2448 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2450 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2451 sd_print_result(sdkp, res);
2452 if (driver_byte(res) & DRIVER_SENSE)
2453 sd_print_sense_hdr(sdkp, &sshdr);
2460 * Send a SYNCHRONIZE CACHE instruction down to the device through
2461 * the normal SCSI command structure. Wait for the command to
2464 static void sd_shutdown(struct device *dev)
2466 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2469 return; /* this can happen */
2472 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2473 sd_sync_cache(sdkp);
2476 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2477 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2478 sd_start_stop_device(sdkp, 0);
2481 scsi_disk_put(sdkp);
2484 static int sd_suspend(struct device *dev, pm_message_t mesg)
2486 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2490 return 0; /* this can happen */
2493 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2494 ret = sd_sync_cache(sdkp);
2499 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2500 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2501 ret = sd_start_stop_device(sdkp, 0);
2505 scsi_disk_put(sdkp);
2509 static int sd_resume(struct device *dev)
2511 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2514 if (!sdkp->device->manage_start_stop)
2517 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2518 ret = sd_start_stop_device(sdkp, 1);
2521 scsi_disk_put(sdkp);
2526 * init_sd - entry point for this driver (both when built in or when
2529 * Note: this function registers this driver with the scsi mid-level.
2531 static int __init init_sd(void)
2533 int majors = 0, i, err;
2535 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2537 for (i = 0; i < SD_MAJORS; i++)
2538 if (register_blkdev(sd_major(i), "sd") == 0)
2544 err = class_register(&sd_disk_class);
2548 err = scsi_register_driver(&sd_template.gendrv);
2552 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2554 if (!sd_cdb_cache) {
2555 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2559 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2561 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2568 kmem_cache_destroy(sd_cdb_cache);
2571 class_unregister(&sd_disk_class);
2573 for (i = 0; i < SD_MAJORS; i++)
2574 unregister_blkdev(sd_major(i), "sd");
2579 * exit_sd - exit point for this driver (when it is a module).
2581 * Note: this function unregisters this driver from the scsi mid-level.
2583 static void __exit exit_sd(void)
2587 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2589 mempool_destroy(sd_cdb_pool);
2590 kmem_cache_destroy(sd_cdb_cache);
2592 scsi_unregister_driver(&sd_template.gendrv);
2593 class_unregister(&sd_disk_class);
2595 for (i = 0; i < SD_MAJORS; i++)
2596 unregister_blkdev(sd_major(i), "sd");
2599 module_init(init_sd);
2600 module_exit(exit_sd);
2602 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2603 struct scsi_sense_hdr *sshdr)
2605 sd_printk(KERN_INFO, sdkp, "");
2606 scsi_show_sense_hdr(sshdr);
2607 sd_printk(KERN_INFO, sdkp, "");
2608 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2611 static void sd_print_result(struct scsi_disk *sdkp, int result)
2613 sd_printk(KERN_INFO, sdkp, "");
2614 scsi_show_result(result);