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/smp_lock.h>
50 #include <linux/mutex.h>
51 #include <linux/string_helpers.h>
52 #include <linux/async.h>
53 #include <linux/slab.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static int sd_revalidate_disk(struct gendisk *);
101 static void sd_unlock_native_capacity(struct gendisk *disk);
102 static int sd_probe(struct device *);
103 static int sd_remove(struct device *);
104 static void sd_shutdown(struct device *);
105 static int sd_suspend(struct device *, pm_message_t state);
106 static int sd_resume(struct device *);
107 static void sd_rescan(struct device *);
108 static int sd_done(struct scsi_cmnd *);
109 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
110 static void scsi_disk_release(struct device *cdev);
111 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112 static void sd_print_result(struct scsi_disk *, int);
114 static DEFINE_SPINLOCK(sd_index_lock);
115 static DEFINE_IDA(sd_index_ida);
117 /* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120 static DEFINE_MUTEX(sd_ref_mutex);
122 struct kmem_cache *sd_cdb_cache;
123 mempool_t *sd_cdb_pool;
125 static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
131 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
134 int i, ct = -1, rcd, wce, sp;
135 struct scsi_disk *sdkp = to_scsi_disk(dev);
136 struct scsi_device *sdp = sdkp->device;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
150 const int len = strlen(sd_cache_types[i]);
151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
175 sd_print_sense_hdr(sdkp, &sshdr);
178 revalidate_disk(sdkp->disk);
183 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
186 struct scsi_disk *sdkp = to_scsi_disk(dev);
187 struct scsi_device *sdp = sdkp->device;
189 if (!capable(CAP_SYS_ADMIN))
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
198 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
201 struct scsi_disk *sdkp = to_scsi_disk(dev);
202 struct scsi_device *sdp = sdkp->device;
204 if (!capable(CAP_SYS_ADMIN))
207 if (sdp->type != TYPE_DISK)
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
216 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
219 struct scsi_disk *sdkp = to_scsi_disk(dev);
220 int ct = sdkp->RCD + 2*sdkp->WCE;
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
228 struct scsi_disk *sdkp = to_scsi_disk(dev);
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
237 struct scsi_disk *sdkp = to_scsi_disk(dev);
238 struct scsi_device *sdp = sdkp->device;
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
267 return snprintf(buf, 20, "%u\n", sdkp->ATO);
271 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
274 struct scsi_disk *sdkp = to_scsi_disk(dev);
276 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
279 static struct device_attribute sd_disk_attrs[] = {
280 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
281 sd_store_cache_type),
282 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
283 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
284 sd_store_allow_restart),
285 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
286 sd_store_manage_start_stop),
287 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
288 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
289 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
293 static struct class sd_disk_class = {
295 .owner = THIS_MODULE,
296 .dev_release = scsi_disk_release,
297 .dev_attrs = sd_disk_attrs,
300 static struct scsi_driver sd_template = {
301 .owner = THIS_MODULE,
306 .suspend = sd_suspend,
308 .shutdown = sd_shutdown,
315 * Device no to disk mapping:
317 * major disc2 disc p1
318 * |............|.............|....|....| <- dev_t
321 * Inside a major, we have 16k disks, however mapped non-
322 * contiguously. The first 16 disks are for major0, the next
323 * ones with major1, ... Disk 256 is for major0 again, disk 272
325 * As we stay compatible with our numbering scheme, we can reuse
326 * the well-know SCSI majors 8, 65--71, 136--143.
328 static int sd_major(int major_idx)
332 return SCSI_DISK0_MAJOR;
334 return SCSI_DISK1_MAJOR + major_idx - 1;
336 return SCSI_DISK8_MAJOR + major_idx - 8;
339 return 0; /* shut up gcc */
343 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
345 struct scsi_disk *sdkp = NULL;
347 if (disk->private_data) {
348 sdkp = scsi_disk(disk);
349 if (scsi_device_get(sdkp->device) == 0)
350 get_device(&sdkp->dev);
357 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
359 struct scsi_disk *sdkp;
361 mutex_lock(&sd_ref_mutex);
362 sdkp = __scsi_disk_get(disk);
363 mutex_unlock(&sd_ref_mutex);
367 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
369 struct scsi_disk *sdkp;
371 mutex_lock(&sd_ref_mutex);
372 sdkp = dev_get_drvdata(dev);
374 sdkp = __scsi_disk_get(sdkp->disk);
375 mutex_unlock(&sd_ref_mutex);
379 static void scsi_disk_put(struct scsi_disk *sdkp)
381 struct scsi_device *sdev = sdkp->device;
383 mutex_lock(&sd_ref_mutex);
384 put_device(&sdkp->dev);
385 scsi_device_put(sdev);
386 mutex_unlock(&sd_ref_mutex);
389 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
391 unsigned int prot_op = SCSI_PROT_NORMAL;
392 unsigned int dix = scsi_prot_sg_count(scmd);
394 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
396 prot_op = SCSI_PROT_READ_PASS;
397 else if (dif && !dix)
398 prot_op = SCSI_PROT_READ_STRIP;
399 else if (!dif && dix)
400 prot_op = SCSI_PROT_READ_INSERT;
403 prot_op = SCSI_PROT_WRITE_PASS;
404 else if (dif && !dix)
405 prot_op = SCSI_PROT_WRITE_INSERT;
406 else if (!dif && dix)
407 prot_op = SCSI_PROT_WRITE_STRIP;
410 scsi_set_prot_op(scmd, prot_op);
411 scsi_set_prot_type(scmd, dif);
415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
416 * @sdp: scsi device to operate one
417 * @rq: Request to prepare
419 * Will issue either UNMAP or WRITE SAME(16) depending on preference
420 * indicated by target device.
422 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
424 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
425 struct bio *bio = rq->bio;
426 sector_t sector = bio->bi_sector;
427 unsigned int nr_sectors = bio_sectors(bio);
432 if (sdkp->device->sector_size == 4096) {
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 * Locking: called with bdev->bd_mutex held.
788 static int sd_open(struct block_device *bdev, fmode_t mode)
790 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
791 struct scsi_device *sdev;
797 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
802 * If the device is in error recovery, wait until it is done.
803 * If the device is offline, then disallow any access to it.
806 if (!scsi_block_when_processing_errors(sdev))
809 if (sdev->removable || sdkp->write_prot)
810 check_disk_change(bdev);
813 * If the drive is empty, just let the open fail.
816 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
820 * If the device has the write protect tab set, have the open fail
821 * if the user expects to be able to write to the thing.
824 if (sdkp->write_prot && (mode & FMODE_WRITE))
828 * It is possible that the disk changing stuff resulted in
829 * the device being taken offline. If this is the case,
830 * report this to the user, and don't pretend that the
831 * open actually succeeded.
834 if (!scsi_device_online(sdev))
837 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
838 if (scsi_block_when_processing_errors(sdev))
839 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
850 * sd_release - invoked when the (last) close(2) is called on this
852 * @inode: only i_rdev member may be used
853 * @filp: only f_mode and f_flags may be used
857 * Note: may block (uninterruptible) if error recovery is underway
860 * Locking: called with bdev->bd_mutex held.
862 static int sd_release(struct gendisk *disk, fmode_t mode)
864 struct scsi_disk *sdkp = scsi_disk(disk);
865 struct scsi_device *sdev = sdkp->device;
867 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
869 if (atomic_dec_return(&sdkp->openers) && sdev->removable) {
870 if (scsi_block_when_processing_errors(sdev))
871 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
875 * XXX and what if there are packets in flight and this close()
876 * XXX is followed by a "rmmod sd_mod"?
882 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
884 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
885 struct scsi_device *sdp = sdkp->device;
886 struct Scsi_Host *host = sdp->host;
889 /* default to most commonly used values */
890 diskinfo[0] = 0x40; /* 1 << 6 */
891 diskinfo[1] = 0x20; /* 1 << 5 */
892 diskinfo[2] = sdkp->capacity >> 11;
894 /* override with calculated, extended default, or driver values */
895 if (host->hostt->bios_param)
896 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
898 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
900 geo->heads = diskinfo[0];
901 geo->sectors = diskinfo[1];
902 geo->cylinders = diskinfo[2];
907 * sd_ioctl - process an ioctl
908 * @inode: only i_rdev/i_bdev members may be used
909 * @filp: only f_mode and f_flags may be used
910 * @cmd: ioctl command number
911 * @arg: this is third argument given to ioctl(2) system call.
912 * Often contains a pointer.
914 * Returns 0 if successful (some ioctls return postive numbers on
915 * success as well). Returns a negated errno value in case of error.
917 * Note: most ioctls are forward onto the block subsystem or further
918 * down in the scsi subsystem.
920 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
921 unsigned int cmd, unsigned long arg)
923 struct gendisk *disk = bdev->bd_disk;
924 struct scsi_device *sdp = scsi_disk(disk)->device;
925 void __user *p = (void __user *)arg;
928 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
929 disk->disk_name, cmd));
932 * If we are in the middle of error recovery, don't let anyone
933 * else try and use this device. Also, if error recovery fails, it
934 * may try and take the device offline, in which case all further
935 * access to the device is prohibited.
937 error = scsi_nonblockable_ioctl(sdp, cmd, p,
938 (mode & FMODE_NDELAY) != 0);
939 if (!scsi_block_when_processing_errors(sdp) || !error)
943 * Send SCSI addressing ioctls directly to mid level, send other
944 * ioctls to block level and then onto mid level if they can't be
948 case SCSI_IOCTL_GET_IDLUN:
949 case SCSI_IOCTL_GET_BUS_NUMBER:
950 error = scsi_ioctl(sdp, cmd, p);
953 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
954 if (error != -ENOTTY)
956 error = scsi_ioctl(sdp, cmd, p);
963 static void set_media_not_present(struct scsi_disk *sdkp)
965 sdkp->media_present = 0;
967 sdkp->device->changed = 1;
971 * sd_media_changed - check if our medium changed
972 * @disk: kernel device descriptor
974 * Returns 0 if not applicable or no change; 1 if change
976 * Note: this function is invoked from the block subsystem.
978 static int sd_media_changed(struct gendisk *disk)
980 struct scsi_disk *sdkp = scsi_disk(disk);
981 struct scsi_device *sdp = sdkp->device;
982 struct scsi_sense_hdr *sshdr = NULL;
985 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
991 * If the device is offline, don't send any commands - just pretend as
992 * if the command failed. If the device ever comes back online, we
993 * can deal with it then. It is only because of unrecoverable errors
994 * that we would ever take a device offline in the first place.
996 if (!scsi_device_online(sdp)) {
997 set_media_not_present(sdkp);
1003 * Using TEST_UNIT_READY enables differentiation between drive with
1004 * no cartridge loaded - NOT READY, drive with changed cartridge -
1005 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1007 * Drives that auto spin down. eg iomega jaz 1G, will be started
1008 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1009 * sd_revalidate() is called.
1013 if (scsi_block_when_processing_errors(sdp)) {
1014 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1015 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1020 * Unable to test, unit probably not ready. This usually
1021 * means there is no disc in the drive. Mark as changed,
1022 * and we will figure it out later once the drive is
1025 if (retval || (scsi_sense_valid(sshdr) &&
1026 /* 0x3a is medium not present */
1027 sshdr->asc == 0x3a)) {
1028 set_media_not_present(sdkp);
1034 * For removable scsi disk we have to recognise the presence
1035 * of a disk in the drive. This is kept in the struct scsi_disk
1036 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1038 sdkp->media_present = 1;
1040 retval = sdp->changed;
1043 if (retval != sdkp->previous_state)
1044 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1045 sdkp->previous_state = retval;
1050 static int sd_sync_cache(struct scsi_disk *sdkp)
1053 struct scsi_device *sdp = sdkp->device;
1054 struct scsi_sense_hdr sshdr;
1056 if (!scsi_device_online(sdp))
1060 for (retries = 3; retries > 0; --retries) {
1061 unsigned char cmd[10] = { 0 };
1063 cmd[0] = SYNCHRONIZE_CACHE;
1065 * Leave the rest of the command zero to indicate
1068 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1069 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1075 sd_print_result(sdkp, res);
1076 if (driver_byte(res) & DRIVER_SENSE)
1077 sd_print_sense_hdr(sdkp, &sshdr);
1085 static void sd_rescan(struct device *dev)
1087 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1090 revalidate_disk(sdkp->disk);
1091 scsi_disk_put(sdkp);
1096 #ifdef CONFIG_COMPAT
1098 * This gets directly called from VFS. When the ioctl
1099 * is not recognized we go back to the other translation paths.
1101 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1102 unsigned int cmd, unsigned long arg)
1104 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1107 * If we are in the middle of error recovery, don't let anyone
1108 * else try and use this device. Also, if error recovery fails, it
1109 * may try and take the device offline, in which case all further
1110 * access to the device is prohibited.
1112 if (!scsi_block_when_processing_errors(sdev))
1115 if (sdev->host->hostt->compat_ioctl) {
1118 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1124 * Let the static ioctl translation table take care of it.
1126 return -ENOIOCTLCMD;
1130 static const struct block_device_operations sd_fops = {
1131 .owner = THIS_MODULE,
1133 .release = sd_release,
1135 .getgeo = sd_getgeo,
1136 #ifdef CONFIG_COMPAT
1137 .compat_ioctl = sd_compat_ioctl,
1139 .media_changed = sd_media_changed,
1140 .revalidate_disk = sd_revalidate_disk,
1141 .unlock_native_capacity = sd_unlock_native_capacity,
1144 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1146 u64 start_lba = blk_rq_pos(scmd->request);
1147 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1151 if (scmd->request->cmd_type != REQ_TYPE_FS)
1154 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1155 SCSI_SENSE_BUFFERSIZE,
1160 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1163 if (scmd->device->sector_size < 512) {
1164 /* only legitimate sector_size here is 256 */
1168 /* be careful ... don't want any overflows */
1169 u64 factor = scmd->device->sector_size / 512;
1170 do_div(start_lba, factor);
1171 do_div(end_lba, factor);
1174 /* The bad lba was reported incorrectly, we have no idea where
1177 if (bad_lba < start_lba || bad_lba >= end_lba)
1180 /* This computation should always be done in terms of
1181 * the resolution of the device's medium.
1183 return (bad_lba - start_lba) * scmd->device->sector_size;
1187 * sd_done - bottom half handler: called when the lower level
1188 * driver has completed (successfully or otherwise) a scsi command.
1189 * @SCpnt: mid-level's per command structure.
1191 * Note: potentially run from within an ISR. Must not block.
1193 static int sd_done(struct scsi_cmnd *SCpnt)
1195 int result = SCpnt->result;
1196 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1197 struct scsi_sense_hdr sshdr;
1198 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1199 int sense_valid = 0;
1200 int sense_deferred = 0;
1202 if (SCpnt->request->cmd_flags & REQ_DISCARD) {
1204 scsi_set_resid(SCpnt, 0);
1209 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1211 sense_deferred = scsi_sense_is_deferred(&sshdr);
1213 #ifdef CONFIG_SCSI_LOGGING
1214 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1216 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1217 "sd_done: sb[respc,sk,asc,"
1218 "ascq]=%x,%x,%x,%x\n",
1219 sshdr.response_code,
1220 sshdr.sense_key, sshdr.asc,
1224 if (driver_byte(result) != DRIVER_SENSE &&
1225 (!sense_valid || sense_deferred))
1228 switch (sshdr.sense_key) {
1229 case HARDWARE_ERROR:
1231 good_bytes = sd_completed_bytes(SCpnt);
1233 case RECOVERED_ERROR:
1234 good_bytes = scsi_bufflen(SCpnt);
1237 /* This indicates a false check condition, so ignore it. An
1238 * unknown amount of data was transferred so treat it as an
1241 scsi_print_sense("sd", SCpnt);
1243 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1245 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1246 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1247 if (sshdr.asc == 0x10)
1248 good_bytes = sd_completed_bytes(SCpnt);
1254 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1255 sd_dif_complete(SCpnt, good_bytes);
1257 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1258 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1260 /* We have to print a failed command here as the
1261 * extended CDB gets freed before scsi_io_completion()
1265 scsi_print_command(SCpnt);
1267 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1275 static int media_not_present(struct scsi_disk *sdkp,
1276 struct scsi_sense_hdr *sshdr)
1279 if (!scsi_sense_valid(sshdr))
1281 /* not invoked for commands that could return deferred errors */
1282 if (sshdr->sense_key != NOT_READY &&
1283 sshdr->sense_key != UNIT_ATTENTION)
1285 if (sshdr->asc != 0x3A) /* medium not present */
1288 set_media_not_present(sdkp);
1293 * spinup disk - called only in sd_revalidate_disk()
1296 sd_spinup_disk(struct scsi_disk *sdkp)
1298 unsigned char cmd[10];
1299 unsigned long spintime_expire = 0;
1300 int retries, spintime;
1301 unsigned int the_result;
1302 struct scsi_sense_hdr sshdr;
1303 int sense_valid = 0;
1307 /* Spin up drives, as required. Only do this at boot time */
1308 /* Spinup needs to be done for module loads too. */
1313 cmd[0] = TEST_UNIT_READY;
1314 memset((void *) &cmd[1], 0, 9);
1316 the_result = scsi_execute_req(sdkp->device, cmd,
1319 SD_MAX_RETRIES, NULL);
1322 * If the drive has indicated to us that it
1323 * doesn't have any media in it, don't bother
1324 * with any more polling.
1326 if (media_not_present(sdkp, &sshdr))
1330 sense_valid = scsi_sense_valid(&sshdr);
1332 } while (retries < 3 &&
1333 (!scsi_status_is_good(the_result) ||
1334 ((driver_byte(the_result) & DRIVER_SENSE) &&
1335 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1337 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1338 /* no sense, TUR either succeeded or failed
1339 * with a status error */
1340 if(!spintime && !scsi_status_is_good(the_result)) {
1341 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1342 sd_print_result(sdkp, the_result);
1348 * The device does not want the automatic start to be issued.
1350 if (sdkp->device->no_start_on_add)
1353 if (sense_valid && sshdr.sense_key == NOT_READY) {
1354 if (sshdr.asc == 4 && sshdr.ascq == 3)
1355 break; /* manual intervention required */
1356 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1357 break; /* standby */
1358 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1359 break; /* unavailable */
1361 * Issue command to spin up drive when not ready
1364 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1365 cmd[0] = START_STOP;
1366 cmd[1] = 1; /* Return immediately */
1367 memset((void *) &cmd[2], 0, 8);
1368 cmd[4] = 1; /* Start spin cycle */
1369 if (sdkp->device->start_stop_pwr_cond)
1371 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1373 SD_TIMEOUT, SD_MAX_RETRIES,
1375 spintime_expire = jiffies + 100 * HZ;
1378 /* Wait 1 second for next try */
1383 * Wait for USB flash devices with slow firmware.
1384 * Yes, this sense key/ASC combination shouldn't
1385 * occur here. It's characteristic of these devices.
1387 } else if (sense_valid &&
1388 sshdr.sense_key == UNIT_ATTENTION &&
1389 sshdr.asc == 0x28) {
1391 spintime_expire = jiffies + 5 * HZ;
1394 /* Wait 1 second for next try */
1397 /* we don't understand the sense code, so it's
1398 * probably pointless to loop */
1400 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1401 sd_print_sense_hdr(sdkp, &sshdr);
1406 } while (spintime && time_before_eq(jiffies, spintime_expire));
1409 if (scsi_status_is_good(the_result))
1412 printk("not responding...\n");
1418 * Determine whether disk supports Data Integrity Field.
1420 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1422 struct scsi_device *sdp = sdkp->device;
1425 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1428 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1430 if (type == sdkp->protection_type || !sdkp->first_scan)
1433 sdkp->protection_type = type;
1435 if (type > SD_DIF_TYPE3_PROTECTION) {
1436 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1437 "protection type %u. Disabling disk!\n", type);
1442 if (scsi_host_dif_capable(sdp->host, type))
1443 sd_printk(KERN_NOTICE, sdkp,
1444 "Enabling DIF Type %u protection\n", type);
1446 sd_printk(KERN_NOTICE, sdkp,
1447 "Disabling DIF Type %u protection\n", type);
1450 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1451 struct scsi_sense_hdr *sshdr, int sense_valid,
1454 sd_print_result(sdkp, the_result);
1455 if (driver_byte(the_result) & DRIVER_SENSE)
1456 sd_print_sense_hdr(sdkp, sshdr);
1458 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1461 * Set dirty bit for removable devices if not ready -
1462 * sometimes drives will not report this properly.
1464 if (sdp->removable &&
1465 sense_valid && sshdr->sense_key == NOT_READY)
1469 * We used to set media_present to 0 here to indicate no media
1470 * in the drive, but some drives fail read capacity even with
1471 * media present, so we can't do that.
1473 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1477 #if RC16_LEN > SD_BUF_SIZE
1478 #error RC16_LEN must not be more than SD_BUF_SIZE
1481 #define READ_CAPACITY_RETRIES_ON_RESET 10
1483 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1484 unsigned char *buffer)
1486 unsigned char cmd[16];
1487 struct scsi_sense_hdr sshdr;
1488 int sense_valid = 0;
1490 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1491 unsigned int alignment;
1492 unsigned long long lba;
1493 unsigned sector_size;
1497 cmd[0] = SERVICE_ACTION_IN;
1498 cmd[1] = SAI_READ_CAPACITY_16;
1500 memset(buffer, 0, RC16_LEN);
1502 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1503 buffer, RC16_LEN, &sshdr,
1504 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1506 if (media_not_present(sdkp, &sshdr))
1510 sense_valid = scsi_sense_valid(&sshdr);
1512 sshdr.sense_key == ILLEGAL_REQUEST &&
1513 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1515 /* Invalid Command Operation Code or
1516 * Invalid Field in CDB, just retry
1517 * silently with RC10 */
1520 sshdr.sense_key == UNIT_ATTENTION &&
1521 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1522 /* Device reset might occur several times,
1523 * give it one more chance */
1524 if (--reset_retries > 0)
1529 } while (the_result && retries);
1532 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1533 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1537 sector_size = get_unaligned_be32(&buffer[8]);
1538 lba = get_unaligned_be64(&buffer[0]);
1540 sd_read_protection_type(sdkp, buffer);
1542 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1543 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1544 "kernel compiled with support for large block "
1550 /* Logical blocks per physical block exponent */
1551 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1553 /* Lowest aligned logical block */
1554 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1555 blk_queue_alignment_offset(sdp->request_queue, alignment);
1556 if (alignment && sdkp->first_scan)
1557 sd_printk(KERN_NOTICE, sdkp,
1558 "physical block alignment offset: %u\n", alignment);
1560 if (buffer[14] & 0x80) { /* TPE */
1561 struct request_queue *q = sdp->request_queue;
1563 sdkp->thin_provisioning = 1;
1564 q->limits.discard_granularity = sdkp->hw_sector_size;
1565 q->limits.max_discard_sectors = 0xffffffff;
1567 if (buffer[14] & 0x40) /* TPRZ */
1568 q->limits.discard_zeroes_data = 1;
1570 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1573 sdkp->capacity = lba + 1;
1577 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1578 unsigned char *buffer)
1580 unsigned char cmd[16];
1581 struct scsi_sense_hdr sshdr;
1582 int sense_valid = 0;
1584 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1586 unsigned sector_size;
1589 cmd[0] = READ_CAPACITY;
1590 memset(&cmd[1], 0, 9);
1591 memset(buffer, 0, 8);
1593 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1595 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1597 if (media_not_present(sdkp, &sshdr))
1601 sense_valid = scsi_sense_valid(&sshdr);
1603 sshdr.sense_key == UNIT_ATTENTION &&
1604 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1605 /* Device reset might occur several times,
1606 * give it one more chance */
1607 if (--reset_retries > 0)
1612 } while (the_result && retries);
1615 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1616 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1620 sector_size = get_unaligned_be32(&buffer[4]);
1621 lba = get_unaligned_be32(&buffer[0]);
1623 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1624 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1625 "kernel compiled with support for large block "
1631 sdkp->capacity = lba + 1;
1632 sdkp->hw_sector_size = sector_size;
1636 static int sd_try_rc16_first(struct scsi_device *sdp)
1638 if (sdp->host->max_cmd_len < 16)
1640 if (sdp->scsi_level > SCSI_SPC_2)
1642 if (scsi_device_protection(sdp))
1648 * read disk capacity
1651 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1654 struct scsi_device *sdp = sdkp->device;
1655 sector_t old_capacity = sdkp->capacity;
1657 if (sd_try_rc16_first(sdp)) {
1658 sector_size = read_capacity_16(sdkp, sdp, buffer);
1659 if (sector_size == -EOVERFLOW)
1661 if (sector_size == -ENODEV)
1663 if (sector_size < 0)
1664 sector_size = read_capacity_10(sdkp, sdp, buffer);
1665 if (sector_size < 0)
1668 sector_size = read_capacity_10(sdkp, sdp, buffer);
1669 if (sector_size == -EOVERFLOW)
1671 if (sector_size < 0)
1673 if ((sizeof(sdkp->capacity) > 4) &&
1674 (sdkp->capacity > 0xffffffffULL)) {
1675 int old_sector_size = sector_size;
1676 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1677 "Trying to use READ CAPACITY(16).\n");
1678 sector_size = read_capacity_16(sdkp, sdp, buffer);
1679 if (sector_size < 0) {
1680 sd_printk(KERN_NOTICE, sdkp,
1681 "Using 0xffffffff as device size\n");
1682 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1683 sector_size = old_sector_size;
1689 /* Some devices are known to return the total number of blocks,
1690 * not the highest block number. Some devices have versions
1691 * which do this and others which do not. Some devices we might
1692 * suspect of doing this but we don't know for certain.
1694 * If we know the reported capacity is wrong, decrement it. If
1695 * we can only guess, then assume the number of blocks is even
1696 * (usually true but not always) and err on the side of lowering
1699 if (sdp->fix_capacity ||
1700 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1701 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1702 "from its reported value: %llu\n",
1703 (unsigned long long) sdkp->capacity);
1708 if (sector_size == 0) {
1710 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1714 if (sector_size != 512 &&
1715 sector_size != 1024 &&
1716 sector_size != 2048 &&
1717 sector_size != 4096 &&
1718 sector_size != 256) {
1719 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1722 * The user might want to re-format the drive with
1723 * a supported sectorsize. Once this happens, it
1724 * would be relatively trivial to set the thing up.
1725 * For this reason, we leave the thing in the table.
1729 * set a bogus sector size so the normal read/write
1730 * logic in the block layer will eventually refuse any
1731 * request on this device without tripping over power
1732 * of two sector size assumptions
1736 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1739 char cap_str_2[10], cap_str_10[10];
1740 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1742 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1744 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1745 sizeof(cap_str_10));
1747 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1748 sd_printk(KERN_NOTICE, sdkp,
1749 "%llu %d-byte logical blocks: (%s/%s)\n",
1750 (unsigned long long)sdkp->capacity,
1751 sector_size, cap_str_10, cap_str_2);
1753 if (sdkp->hw_sector_size != sector_size)
1754 sd_printk(KERN_NOTICE, sdkp,
1755 "%u-byte physical blocks\n",
1756 sdkp->hw_sector_size);
1760 /* Rescale capacity to 512-byte units */
1761 if (sector_size == 4096)
1762 sdkp->capacity <<= 3;
1763 else if (sector_size == 2048)
1764 sdkp->capacity <<= 2;
1765 else if (sector_size == 1024)
1766 sdkp->capacity <<= 1;
1767 else if (sector_size == 256)
1768 sdkp->capacity >>= 1;
1770 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1771 sdkp->device->sector_size = sector_size;
1774 /* called with buffer of length 512 */
1776 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1777 unsigned char *buffer, int len, struct scsi_mode_data *data,
1778 struct scsi_sense_hdr *sshdr)
1780 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1781 SD_TIMEOUT, SD_MAX_RETRIES, data,
1786 * read write protect setting, if possible - called only in sd_revalidate_disk()
1787 * called with buffer of length SD_BUF_SIZE
1790 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1793 struct scsi_device *sdp = sdkp->device;
1794 struct scsi_mode_data data;
1795 int old_wp = sdkp->write_prot;
1797 set_disk_ro(sdkp->disk, 0);
1798 if (sdp->skip_ms_page_3f) {
1799 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1803 if (sdp->use_192_bytes_for_3f) {
1804 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1807 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1808 * We have to start carefully: some devices hang if we ask
1809 * for more than is available.
1811 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1814 * Second attempt: ask for page 0 When only page 0 is
1815 * implemented, a request for page 3F may return Sense Key
1816 * 5: Illegal Request, Sense Code 24: Invalid field in
1819 if (!scsi_status_is_good(res))
1820 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1823 * Third attempt: ask 255 bytes, as we did earlier.
1825 if (!scsi_status_is_good(res))
1826 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1830 if (!scsi_status_is_good(res)) {
1831 sd_printk(KERN_WARNING, sdkp,
1832 "Test WP failed, assume Write Enabled\n");
1834 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1835 set_disk_ro(sdkp->disk, sdkp->write_prot);
1836 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1837 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1838 sdkp->write_prot ? "on" : "off");
1839 sd_printk(KERN_DEBUG, sdkp,
1840 "Mode Sense: %02x %02x %02x %02x\n",
1841 buffer[0], buffer[1], buffer[2], buffer[3]);
1847 * sd_read_cache_type - called only from sd_revalidate_disk()
1848 * called with buffer of length SD_BUF_SIZE
1851 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1854 struct scsi_device *sdp = sdkp->device;
1858 struct scsi_mode_data data;
1859 struct scsi_sense_hdr sshdr;
1860 int old_wce = sdkp->WCE;
1861 int old_rcd = sdkp->RCD;
1862 int old_dpofua = sdkp->DPOFUA;
1864 if (sdp->skip_ms_page_8)
1867 if (sdp->type == TYPE_RBC) {
1875 /* cautiously ask */
1876 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1878 if (!scsi_status_is_good(res))
1881 if (!data.header_length) {
1883 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1886 /* that went OK, now ask for the proper length */
1890 * We're only interested in the first three bytes, actually.
1891 * But the data cache page is defined for the first 20.
1898 /* Take headers and block descriptors into account */
1899 len += data.header_length + data.block_descriptor_length;
1900 if (len > SD_BUF_SIZE)
1904 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1906 if (scsi_status_is_good(res)) {
1907 int offset = data.header_length + data.block_descriptor_length;
1909 if (offset >= SD_BUF_SIZE - 2) {
1910 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1914 if ((buffer[offset] & 0x3f) != modepage) {
1915 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1919 if (modepage == 8) {
1920 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1921 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1923 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1927 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1928 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1929 sd_printk(KERN_NOTICE, sdkp,
1930 "Uses READ/WRITE(6), disabling FUA\n");
1934 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1935 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1936 sd_printk(KERN_NOTICE, sdkp,
1937 "Write cache: %s, read cache: %s, %s\n",
1938 sdkp->WCE ? "enabled" : "disabled",
1939 sdkp->RCD ? "disabled" : "enabled",
1940 sdkp->DPOFUA ? "supports DPO and FUA"
1941 : "doesn't support DPO or FUA");
1947 if (scsi_sense_valid(&sshdr) &&
1948 sshdr.sense_key == ILLEGAL_REQUEST &&
1949 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1950 /* Invalid field in CDB */
1951 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1953 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1956 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1963 * The ATO bit indicates whether the DIF application tag is available
1964 * for use by the operating system.
1966 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1969 struct scsi_device *sdp = sdkp->device;
1970 struct scsi_mode_data data;
1971 struct scsi_sense_hdr sshdr;
1973 if (sdp->type != TYPE_DISK)
1976 if (sdkp->protection_type == 0)
1979 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1980 SD_MAX_RETRIES, &data, &sshdr);
1982 if (!scsi_status_is_good(res) || !data.header_length ||
1984 sd_printk(KERN_WARNING, sdkp,
1985 "getting Control mode page failed, assume no ATO\n");
1987 if (scsi_sense_valid(&sshdr))
1988 sd_print_sense_hdr(sdkp, &sshdr);
1993 offset = data.header_length + data.block_descriptor_length;
1995 if ((buffer[offset] & 0x3f) != 0x0a) {
1996 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2000 if ((buffer[offset + 5] & 0x80) == 0)
2009 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2010 * @disk: disk to query
2012 static void sd_read_block_limits(struct scsi_disk *sdkp)
2014 struct request_queue *q = sdkp->disk->queue;
2015 unsigned int sector_sz = sdkp->device->sector_size;
2016 const int vpd_len = 64;
2017 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2020 /* Block Limits VPD */
2021 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2024 blk_queue_io_min(sdkp->disk->queue,
2025 get_unaligned_be16(&buffer[6]) * sector_sz);
2026 blk_queue_io_opt(sdkp->disk->queue,
2027 get_unaligned_be32(&buffer[12]) * sector_sz);
2029 /* Thin provisioning enabled and page length indicates TP support */
2030 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2031 unsigned int lba_count, desc_count, granularity;
2033 lba_count = get_unaligned_be32(&buffer[20]);
2034 desc_count = get_unaligned_be32(&buffer[24]);
2037 q->limits.max_discard_sectors =
2038 lba_count * sector_sz >> 9;
2044 granularity = get_unaligned_be32(&buffer[28]);
2047 q->limits.discard_granularity = granularity * sector_sz;
2049 if (buffer[32] & 0x80)
2050 q->limits.discard_alignment =
2051 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2059 * sd_read_block_characteristics - Query block dev. characteristics
2060 * @disk: disk to query
2062 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2064 unsigned char *buffer;
2066 const int vpd_len = 64;
2068 buffer = kmalloc(vpd_len, GFP_KERNEL);
2071 /* Block Device Characteristics VPD */
2072 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2075 rot = get_unaligned_be16(&buffer[4]);
2078 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2084 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2087 * Although VPD inquiries can go to SCSI-2 type devices,
2088 * some USB ones crash on receiving them, and the pages
2089 * we currently ask for are for SPC-3 and beyond
2091 if (sdp->scsi_level > SCSI_SPC_2)
2097 * sd_revalidate_disk - called the first time a new disk is seen,
2098 * performs disk spin up, read_capacity, etc.
2099 * @disk: struct gendisk we care about
2101 static int sd_revalidate_disk(struct gendisk *disk)
2103 struct scsi_disk *sdkp = scsi_disk(disk);
2104 struct scsi_device *sdp = sdkp->device;
2105 unsigned char *buffer;
2108 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2109 "sd_revalidate_disk\n"));
2112 * If the device is offline, don't try and read capacity or any
2113 * of the other niceties.
2115 if (!scsi_device_online(sdp))
2118 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2120 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2121 "allocation failure.\n");
2125 sd_spinup_disk(sdkp);
2128 * Without media there is no reason to ask; moreover, some devices
2129 * react badly if we do.
2131 if (sdkp->media_present) {
2132 sd_read_capacity(sdkp, buffer);
2134 if (sd_try_extended_inquiry(sdp)) {
2135 sd_read_block_limits(sdkp);
2136 sd_read_block_characteristics(sdkp);
2139 sd_read_write_protect_flag(sdkp, buffer);
2140 sd_read_cache_type(sdkp, buffer);
2141 sd_read_app_tag_own(sdkp, buffer);
2144 sdkp->first_scan = 0;
2147 * We now have all cache related info, determine how we deal
2148 * with ordered requests. Note that as the current SCSI
2149 * dispatch function can alter request order, we cannot use
2150 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2153 ordered = sdkp->DPOFUA
2154 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2156 ordered = QUEUE_ORDERED_DRAIN;
2158 blk_queue_ordered(sdkp->disk->queue, ordered);
2160 set_capacity(disk, sdkp->capacity);
2168 * sd_unlock_native_capacity - unlock native capacity
2169 * @disk: struct gendisk to set capacity for
2171 * Block layer calls this function if it detects that partitions
2172 * on @disk reach beyond the end of the device. If the SCSI host
2173 * implements ->unlock_native_capacity() method, it's invoked to
2174 * give it a chance to adjust the device capacity.
2177 * Defined by block layer. Might sleep.
2179 static void sd_unlock_native_capacity(struct gendisk *disk)
2181 struct scsi_device *sdev = scsi_disk(disk)->device;
2183 if (sdev->host->hostt->unlock_native_capacity)
2184 sdev->host->hostt->unlock_native_capacity(sdev);
2188 * sd_format_disk_name - format disk name
2189 * @prefix: name prefix - ie. "sd" for SCSI disks
2190 * @index: index of the disk to format name for
2191 * @buf: output buffer
2192 * @buflen: length of the output buffer
2194 * SCSI disk names starts at sda. The 26th device is sdz and the
2195 * 27th is sdaa. The last one for two lettered suffix is sdzz
2196 * which is followed by sdaaa.
2198 * This is basically 26 base counting with one extra 'nil' entry
2199 * at the beginning from the second digit on and can be
2200 * determined using similar method as 26 base conversion with the
2201 * index shifted -1 after each digit is computed.
2207 * 0 on success, -errno on failure.
2209 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2211 const int base = 'z' - 'a' + 1;
2212 char *begin = buf + strlen(prefix);
2213 char *end = buf + buflen;
2223 *--p = 'a' + (index % unit);
2224 index = (index / unit) - 1;
2225 } while (index >= 0);
2227 memmove(begin, p, end - p);
2228 memcpy(buf, prefix, strlen(prefix));
2234 * The asynchronous part of sd_probe
2236 static void sd_probe_async(void *data, async_cookie_t cookie)
2238 struct scsi_disk *sdkp = data;
2239 struct scsi_device *sdp;
2246 index = sdkp->index;
2247 dev = &sdp->sdev_gendev;
2249 if (index < SD_MAX_DISKS) {
2250 gd->major = sd_major((index & 0xf0) >> 4);
2251 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2252 gd->minors = SD_MINORS;
2254 gd->fops = &sd_fops;
2255 gd->private_data = &sdkp->driver;
2256 gd->queue = sdkp->device->request_queue;
2258 /* defaults, until the device tells us otherwise */
2259 sdp->sector_size = 512;
2261 sdkp->media_present = 1;
2262 sdkp->write_prot = 0;
2266 sdkp->first_scan = 1;
2268 sd_revalidate_disk(gd);
2270 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2271 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2273 gd->driverfs_dev = &sdp->sdev_gendev;
2274 gd->flags = GENHD_FL_EXT_DEVT;
2276 gd->flags |= GENHD_FL_REMOVABLE;
2278 dev_set_drvdata(dev, sdkp);
2280 sd_dif_config_host(sdkp);
2282 sd_revalidate_disk(gd);
2284 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2285 sdp->removable ? "removable " : "");
2286 put_device(&sdkp->dev);
2290 * sd_probe - called during driver initialization and whenever a
2291 * new scsi device is attached to the system. It is called once
2292 * for each scsi device (not just disks) present.
2293 * @dev: pointer to device object
2295 * Returns 0 if successful (or not interested in this scsi device
2296 * (e.g. scanner)); 1 when there is an error.
2298 * Note: this function is invoked from the scsi mid-level.
2299 * This function sets up the mapping between a given
2300 * <host,channel,id,lun> (found in sdp) and new device name
2301 * (e.g. /dev/sda). More precisely it is the block device major
2302 * and minor number that is chosen here.
2304 * Assume sd_attach is not re-entrant (for time being)
2305 * Also think about sd_attach() and sd_remove() running coincidentally.
2307 static int sd_probe(struct device *dev)
2309 struct scsi_device *sdp = to_scsi_device(dev);
2310 struct scsi_disk *sdkp;
2316 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2319 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2323 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2327 gd = alloc_disk(SD_MINORS);
2332 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2335 spin_lock(&sd_index_lock);
2336 error = ida_get_new(&sd_index_ida, &index);
2337 spin_unlock(&sd_index_lock);
2338 } while (error == -EAGAIN);
2343 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2345 goto out_free_index;
2348 sdkp->driver = &sd_template;
2350 sdkp->index = index;
2351 atomic_set(&sdkp->openers, 0);
2352 sdkp->previous_state = 1;
2354 if (!sdp->request_queue->rq_timeout) {
2355 if (sdp->type != TYPE_MOD)
2356 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2358 blk_queue_rq_timeout(sdp->request_queue,
2362 device_initialize(&sdkp->dev);
2363 sdkp->dev.parent = &sdp->sdev_gendev;
2364 sdkp->dev.class = &sd_disk_class;
2365 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2367 if (device_add(&sdkp->dev))
2368 goto out_free_index;
2370 get_device(&sdp->sdev_gendev);
2372 get_device(&sdkp->dev); /* prevent release before async_schedule */
2373 async_schedule(sd_probe_async, sdkp);
2378 spin_lock(&sd_index_lock);
2379 ida_remove(&sd_index_ida, index);
2380 spin_unlock(&sd_index_lock);
2390 * sd_remove - called whenever a scsi disk (previously recognized by
2391 * sd_probe) is detached from the system. It is called (potentially
2392 * multiple times) during sd module unload.
2393 * @sdp: pointer to mid level scsi device object
2395 * Note: this function is invoked from the scsi mid-level.
2396 * This function potentially frees up a device name (e.g. /dev/sdc)
2397 * that could be re-used by a subsequent sd_probe().
2398 * This function is not called when the built-in sd driver is "exit-ed".
2400 static int sd_remove(struct device *dev)
2402 struct scsi_disk *sdkp;
2404 async_synchronize_full();
2405 sdkp = dev_get_drvdata(dev);
2406 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2407 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2408 device_del(&sdkp->dev);
2409 del_gendisk(sdkp->disk);
2412 mutex_lock(&sd_ref_mutex);
2413 dev_set_drvdata(dev, NULL);
2414 put_device(&sdkp->dev);
2415 mutex_unlock(&sd_ref_mutex);
2421 * scsi_disk_release - Called to free the scsi_disk structure
2422 * @dev: pointer to embedded class device
2424 * sd_ref_mutex must be held entering this routine. Because it is
2425 * called on last put, you should always use the scsi_disk_get()
2426 * scsi_disk_put() helpers which manipulate the semaphore directly
2427 * and never do a direct put_device.
2429 static void scsi_disk_release(struct device *dev)
2431 struct scsi_disk *sdkp = to_scsi_disk(dev);
2432 struct gendisk *disk = sdkp->disk;
2434 spin_lock(&sd_index_lock);
2435 ida_remove(&sd_index_ida, sdkp->index);
2436 spin_unlock(&sd_index_lock);
2438 disk->private_data = NULL;
2440 put_device(&sdkp->device->sdev_gendev);
2445 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2447 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2448 struct scsi_sense_hdr sshdr;
2449 struct scsi_device *sdp = sdkp->device;
2453 cmd[4] |= 1; /* START */
2455 if (sdp->start_stop_pwr_cond)
2456 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2458 if (!scsi_device_online(sdp))
2461 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2462 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2464 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2465 sd_print_result(sdkp, res);
2466 if (driver_byte(res) & DRIVER_SENSE)
2467 sd_print_sense_hdr(sdkp, &sshdr);
2474 * Send a SYNCHRONIZE CACHE instruction down to the device through
2475 * the normal SCSI command structure. Wait for the command to
2478 static void sd_shutdown(struct device *dev)
2480 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2483 return; /* this can happen */
2486 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2487 sd_sync_cache(sdkp);
2490 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2491 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2492 sd_start_stop_device(sdkp, 0);
2495 scsi_disk_put(sdkp);
2498 static int sd_suspend(struct device *dev, pm_message_t mesg)
2500 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2504 return 0; /* this can happen */
2507 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2508 ret = sd_sync_cache(sdkp);
2513 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2514 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2515 ret = sd_start_stop_device(sdkp, 0);
2519 scsi_disk_put(sdkp);
2523 static int sd_resume(struct device *dev)
2525 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2528 if (!sdkp->device->manage_start_stop)
2531 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2532 ret = sd_start_stop_device(sdkp, 1);
2535 scsi_disk_put(sdkp);
2540 * init_sd - entry point for this driver (both when built in or when
2543 * Note: this function registers this driver with the scsi mid-level.
2545 static int __init init_sd(void)
2547 int majors = 0, i, err;
2549 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2551 for (i = 0; i < SD_MAJORS; i++)
2552 if (register_blkdev(sd_major(i), "sd") == 0)
2558 err = class_register(&sd_disk_class);
2562 err = scsi_register_driver(&sd_template.gendrv);
2566 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2568 if (!sd_cdb_cache) {
2569 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2573 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2575 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2582 kmem_cache_destroy(sd_cdb_cache);
2585 class_unregister(&sd_disk_class);
2587 for (i = 0; i < SD_MAJORS; i++)
2588 unregister_blkdev(sd_major(i), "sd");
2593 * exit_sd - exit point for this driver (when it is a module).
2595 * Note: this function unregisters this driver from the scsi mid-level.
2597 static void __exit exit_sd(void)
2601 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2603 mempool_destroy(sd_cdb_pool);
2604 kmem_cache_destroy(sd_cdb_cache);
2606 scsi_unregister_driver(&sd_template.gendrv);
2607 class_unregister(&sd_disk_class);
2609 for (i = 0; i < SD_MAJORS; i++)
2610 unregister_blkdev(sd_major(i), "sd");
2613 module_init(init_sd);
2614 module_exit(exit_sd);
2616 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2617 struct scsi_sense_hdr *sshdr)
2619 sd_printk(KERN_INFO, sdkp, "");
2620 scsi_show_sense_hdr(sshdr);
2621 sd_printk(KERN_INFO, sdkp, "");
2622 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2625 static void sd_print_result(struct scsi_disk *sdkp, int result)
2627 sd_printk(KERN_INFO, sdkp, "");
2628 scsi_show_result(result);