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 <asm/uaccess.h>
53 #include <asm/unaligned.h>
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_eh.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsicam.h>
66 #include "scsi_logging.h"
68 MODULE_AUTHOR("Eric Youngdale");
69 MODULE_DESCRIPTION("SCSI disk (sd) driver");
70 MODULE_LICENSE("GPL");
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
92 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
98 static int sd_revalidate_disk(struct gendisk *);
99 static int sd_probe(struct device *);
100 static int sd_remove(struct device *);
101 static void sd_shutdown(struct device *);
102 static int sd_suspend(struct device *, pm_message_t state);
103 static int sd_resume(struct device *);
104 static void sd_rescan(struct device *);
105 static int sd_done(struct scsi_cmnd *);
106 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
107 static void scsi_disk_release(struct device *cdev);
108 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
109 static void sd_print_result(struct scsi_disk *, int);
111 static DEFINE_SPINLOCK(sd_index_lock);
112 static DEFINE_IDA(sd_index_ida);
114 /* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
117 static DEFINE_MUTEX(sd_ref_mutex);
119 struct kmem_cache *sd_cdb_cache;
120 mempool_t *sd_cdb_pool;
122 static const char *sd_cache_types[] = {
123 "write through", "none", "write back",
124 "write back, no read (daft)"
128 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
129 const char *buf, size_t count)
131 int i, ct = -1, rcd, wce, sp;
132 struct scsi_disk *sdkp = to_scsi_disk(dev);
133 struct scsi_device *sdp = sdkp->device;
136 struct scsi_mode_data data;
137 struct scsi_sense_hdr sshdr;
140 if (sdp->type != TYPE_DISK)
141 /* no cache control on RBC devices; theoretically they
142 * can do it, but there's probably so many exceptions
143 * it's not worth the risk */
146 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
147 const int len = strlen(sd_cache_types[i]);
148 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
156 rcd = ct & 0x01 ? 1 : 0;
157 wce = ct & 0x02 ? 1 : 0;
158 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
159 SD_MAX_RETRIES, &data, NULL))
161 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
162 data.block_descriptor_length);
163 buffer_data = buffer + data.header_length +
164 data.block_descriptor_length;
165 buffer_data[2] &= ~0x05;
166 buffer_data[2] |= wce << 2 | rcd;
167 sp = buffer_data[0] & 0x80 ? 1 : 0;
169 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
170 SD_MAX_RETRIES, &data, &sshdr)) {
171 if (scsi_sense_valid(&sshdr))
172 sd_print_sense_hdr(sdkp, &sshdr);
175 revalidate_disk(sdkp->disk);
180 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
181 const char *buf, size_t count)
183 struct scsi_disk *sdkp = to_scsi_disk(dev);
184 struct scsi_device *sdp = sdkp->device;
186 if (!capable(CAP_SYS_ADMIN))
189 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
195 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
196 const char *buf, size_t count)
198 struct scsi_disk *sdkp = to_scsi_disk(dev);
199 struct scsi_device *sdp = sdkp->device;
201 if (!capable(CAP_SYS_ADMIN))
204 if (sdp->type != TYPE_DISK)
207 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
213 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
216 struct scsi_disk *sdkp = to_scsi_disk(dev);
217 int ct = sdkp->RCD + 2*sdkp->WCE;
219 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
223 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
225 struct scsi_disk *sdkp = to_scsi_disk(dev);
227 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
231 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 struct scsi_device *sdp = sdkp->device;
237 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
241 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
244 struct scsi_disk *sdkp = to_scsi_disk(dev);
246 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
253 struct scsi_disk *sdkp = to_scsi_disk(dev);
255 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
262 struct scsi_disk *sdkp = to_scsi_disk(dev);
264 return snprintf(buf, 20, "%u\n", sdkp->ATO);
267 static struct device_attribute sd_disk_attrs[] = {
268 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
269 sd_store_cache_type),
270 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
271 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
272 sd_store_allow_restart),
273 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
274 sd_store_manage_start_stop),
275 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
276 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
280 static struct class sd_disk_class = {
282 .owner = THIS_MODULE,
283 .dev_release = scsi_disk_release,
284 .dev_attrs = sd_disk_attrs,
287 static struct scsi_driver sd_template = {
288 .owner = THIS_MODULE,
293 .suspend = sd_suspend,
295 .shutdown = sd_shutdown,
302 * Device no to disk mapping:
304 * major disc2 disc p1
305 * |............|.............|....|....| <- dev_t
308 * Inside a major, we have 16k disks, however mapped non-
309 * contiguously. The first 16 disks are for major0, the next
310 * ones with major1, ... Disk 256 is for major0 again, disk 272
312 * As we stay compatible with our numbering scheme, we can reuse
313 * the well-know SCSI majors 8, 65--71, 136--143.
315 static int sd_major(int major_idx)
319 return SCSI_DISK0_MAJOR;
321 return SCSI_DISK1_MAJOR + major_idx - 1;
323 return SCSI_DISK8_MAJOR + major_idx - 8;
326 return 0; /* shut up gcc */
330 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
332 struct scsi_disk *sdkp = NULL;
334 if (disk->private_data) {
335 sdkp = scsi_disk(disk);
336 if (scsi_device_get(sdkp->device) == 0)
337 get_device(&sdkp->dev);
344 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
346 struct scsi_disk *sdkp;
348 mutex_lock(&sd_ref_mutex);
349 sdkp = __scsi_disk_get(disk);
350 mutex_unlock(&sd_ref_mutex);
354 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
356 struct scsi_disk *sdkp;
358 mutex_lock(&sd_ref_mutex);
359 sdkp = dev_get_drvdata(dev);
361 sdkp = __scsi_disk_get(sdkp->disk);
362 mutex_unlock(&sd_ref_mutex);
366 static void scsi_disk_put(struct scsi_disk *sdkp)
368 struct scsi_device *sdev = sdkp->device;
370 mutex_lock(&sd_ref_mutex);
371 put_device(&sdkp->dev);
372 scsi_device_put(sdev);
373 mutex_unlock(&sd_ref_mutex);
376 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
378 unsigned int prot_op = SCSI_PROT_NORMAL;
379 unsigned int dix = scsi_prot_sg_count(scmd);
381 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
383 prot_op = SCSI_PROT_READ_PASS;
384 else if (dif && !dix)
385 prot_op = SCSI_PROT_READ_STRIP;
386 else if (!dif && dix)
387 prot_op = SCSI_PROT_READ_INSERT;
390 prot_op = SCSI_PROT_WRITE_PASS;
391 else if (dif && !dix)
392 prot_op = SCSI_PROT_WRITE_INSERT;
393 else if (!dif && dix)
394 prot_op = SCSI_PROT_WRITE_STRIP;
397 scsi_set_prot_op(scmd, prot_op);
398 scsi_set_prot_type(scmd, dif);
402 * sd_init_command - build a scsi (read or write) command from
403 * information in the request structure.
404 * @SCpnt: pointer to mid-level's per scsi command structure that
405 * contains request and into which the scsi command is written
407 * Returns 1 if successful and 0 if error (or cannot be done now).
409 static int sd_prep_fn(struct request_queue *q, struct request *rq)
411 struct scsi_cmnd *SCpnt;
412 struct scsi_device *sdp = q->queuedata;
413 struct gendisk *disk = rq->rq_disk;
414 struct scsi_disk *sdkp;
415 sector_t block = blk_rq_pos(rq);
417 unsigned int this_count = blk_rq_sectors(rq);
419 unsigned char protect;
421 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
422 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
424 } else if (rq->cmd_type != REQ_TYPE_FS) {
428 ret = scsi_setup_fs_cmnd(sdp, rq);
429 if (ret != BLKPREP_OK)
432 sdkp = scsi_disk(disk);
434 /* from here on until we're complete, any goto out
435 * is used for a killable error condition */
438 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
439 "sd_init_command: block=%llu, "
441 (unsigned long long)block,
444 if (!sdp || !scsi_device_online(sdp) ||
445 block + blk_rq_sectors(rq) > get_capacity(disk)) {
446 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
447 "Finishing %u sectors\n",
448 blk_rq_sectors(rq)));
449 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
450 "Retry with 0x%p\n", SCpnt));
456 * quietly refuse to do anything to a changed disc until
457 * the changed bit has been reset
459 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
464 * Some SD card readers can't handle multi-sector accesses which touch
465 * the last one or two hardware sectors. Split accesses as needed.
467 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
468 (sdp->sector_size / 512);
470 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
471 if (block < threshold) {
472 /* Access up to the threshold but not beyond */
473 this_count = threshold - block;
475 /* Access only a single hardware sector */
476 this_count = sdp->sector_size / 512;
480 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
481 (unsigned long long)block));
484 * If we have a 1K hardware sectorsize, prevent access to single
485 * 512 byte sectors. In theory we could handle this - in fact
486 * the scsi cdrom driver must be able to handle this because
487 * we typically use 1K blocksizes, and cdroms typically have
488 * 2K hardware sectorsizes. Of course, things are simpler
489 * with the cdrom, since it is read-only. For performance
490 * reasons, the filesystems should be able to handle this
491 * and not force the scsi disk driver to use bounce buffers
494 if (sdp->sector_size == 1024) {
495 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
496 scmd_printk(KERN_ERR, SCpnt,
497 "Bad block number requested\n");
501 this_count = this_count >> 1;
504 if (sdp->sector_size == 2048) {
505 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
506 scmd_printk(KERN_ERR, SCpnt,
507 "Bad block number requested\n");
511 this_count = this_count >> 2;
514 if (sdp->sector_size == 4096) {
515 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
516 scmd_printk(KERN_ERR, SCpnt,
517 "Bad block number requested\n");
521 this_count = this_count >> 3;
524 if (rq_data_dir(rq) == WRITE) {
525 if (!sdp->writeable) {
528 SCpnt->cmnd[0] = WRITE_6;
529 SCpnt->sc_data_direction = DMA_TO_DEVICE;
531 if (blk_integrity_rq(rq) &&
532 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
535 } else if (rq_data_dir(rq) == READ) {
536 SCpnt->cmnd[0] = READ_6;
537 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
539 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
543 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
544 "%s %d/%u 512 byte blocks.\n",
545 (rq_data_dir(rq) == WRITE) ?
546 "writing" : "reading", this_count,
547 blk_rq_sectors(rq)));
549 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
550 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
556 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
557 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
559 if (unlikely(SCpnt->cmnd == NULL)) {
564 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
565 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
566 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
567 SCpnt->cmnd[7] = 0x18;
568 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
569 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
572 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
573 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
574 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
575 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
576 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
577 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
578 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
579 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
581 /* Expected Indirect LBA */
582 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
583 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
584 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
585 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
587 /* Transfer length */
588 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
589 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
590 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
591 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
592 } else if (block > 0xffffffff) {
593 SCpnt->cmnd[0] += READ_16 - READ_6;
594 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
595 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
596 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
597 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
598 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
599 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
600 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
601 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
602 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
603 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
604 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
605 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
606 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
607 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
608 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
609 scsi_device_protection(SCpnt->device) ||
610 SCpnt->device->use_10_for_rw) {
611 if (this_count > 0xffff)
614 SCpnt->cmnd[0] += READ_10 - READ_6;
615 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
616 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
617 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
618 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
619 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
620 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
621 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
622 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
624 if (unlikely(blk_fua_rq(rq))) {
626 * This happens only if this drive failed
627 * 10byte rw command with ILLEGAL_REQUEST
628 * during operation and thus turned off
631 scmd_printk(KERN_ERR, SCpnt,
632 "FUA write on READ/WRITE(6) drive\n");
636 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
637 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
638 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
639 SCpnt->cmnd[4] = (unsigned char) this_count;
642 SCpnt->sdb.length = this_count * sdp->sector_size;
644 /* If DIF or DIX is enabled, tell HBA how to handle request */
645 if (host_dif || scsi_prot_sg_count(SCpnt))
646 sd_prot_op(SCpnt, host_dif);
649 * We shouldn't disconnect in the middle of a sector, so with a dumb
650 * host adapter, it's safe to assume that we can at least transfer
651 * this many bytes between each connect / disconnect.
653 SCpnt->transfersize = sdp->sector_size;
654 SCpnt->underflow = this_count << 9;
655 SCpnt->allowed = SD_MAX_RETRIES;
658 * This indicates that the command is ready from our end to be
663 return scsi_prep_return(q, rq, ret);
667 * sd_open - open a scsi disk device
668 * @inode: only i_rdev member may be used
669 * @filp: only f_mode and f_flags may be used
671 * Returns 0 if successful. Returns a negated errno value in case
674 * Note: This can be called from a user context (e.g. fsck(1) )
675 * or from within the kernel (e.g. as a result of a mount(1) ).
676 * In the latter case @inode and @filp carry an abridged amount
677 * of information as noted above.
679 static int sd_open(struct block_device *bdev, fmode_t mode)
681 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
682 struct scsi_device *sdev;
688 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
693 * If the device is in error recovery, wait until it is done.
694 * If the device is offline, then disallow any access to it.
697 if (!scsi_block_when_processing_errors(sdev))
700 if (sdev->removable || sdkp->write_prot)
701 check_disk_change(bdev);
704 * If the drive is empty, just let the open fail.
707 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
711 * If the device has the write protect tab set, have the open fail
712 * if the user expects to be able to write to the thing.
715 if (sdkp->write_prot && (mode & FMODE_WRITE))
719 * It is possible that the disk changing stuff resulted in
720 * the device being taken offline. If this is the case,
721 * report this to the user, and don't pretend that the
722 * open actually succeeded.
725 if (!scsi_device_online(sdev))
728 if (!sdkp->openers++ && sdev->removable) {
729 if (scsi_block_when_processing_errors(sdev))
730 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
741 * sd_release - invoked when the (last) close(2) is called on this
743 * @inode: only i_rdev member may be used
744 * @filp: only f_mode and f_flags may be used
748 * Note: may block (uninterruptible) if error recovery is underway
751 static int sd_release(struct gendisk *disk, fmode_t mode)
753 struct scsi_disk *sdkp = scsi_disk(disk);
754 struct scsi_device *sdev = sdkp->device;
756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
758 if (!--sdkp->openers && sdev->removable) {
759 if (scsi_block_when_processing_errors(sdev))
760 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
764 * XXX and what if there are packets in flight and this close()
765 * XXX is followed by a "rmmod sd_mod"?
771 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
773 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
774 struct scsi_device *sdp = sdkp->device;
775 struct Scsi_Host *host = sdp->host;
778 /* default to most commonly used values */
779 diskinfo[0] = 0x40; /* 1 << 6 */
780 diskinfo[1] = 0x20; /* 1 << 5 */
781 diskinfo[2] = sdkp->capacity >> 11;
783 /* override with calculated, extended default, or driver values */
784 if (host->hostt->bios_param)
785 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
787 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
789 geo->heads = diskinfo[0];
790 geo->sectors = diskinfo[1];
791 geo->cylinders = diskinfo[2];
796 * sd_ioctl - process an ioctl
797 * @inode: only i_rdev/i_bdev members may be used
798 * @filp: only f_mode and f_flags may be used
799 * @cmd: ioctl command number
800 * @arg: this is third argument given to ioctl(2) system call.
801 * Often contains a pointer.
803 * Returns 0 if successful (some ioctls return postive numbers on
804 * success as well). Returns a negated errno value in case of error.
806 * Note: most ioctls are forward onto the block subsystem or further
807 * down in the scsi subsystem.
809 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
810 unsigned int cmd, unsigned long arg)
812 struct gendisk *disk = bdev->bd_disk;
813 struct scsi_device *sdp = scsi_disk(disk)->device;
814 void __user *p = (void __user *)arg;
817 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
818 disk->disk_name, cmd));
821 * If we are in the middle of error recovery, don't let anyone
822 * else try and use this device. Also, if error recovery fails, it
823 * may try and take the device offline, in which case all further
824 * access to the device is prohibited.
826 error = scsi_nonblockable_ioctl(sdp, cmd, p,
827 (mode & FMODE_NDELAY) != 0);
828 if (!scsi_block_when_processing_errors(sdp) || !error)
832 * Send SCSI addressing ioctls directly to mid level, send other
833 * ioctls to block level and then onto mid level if they can't be
837 case SCSI_IOCTL_GET_IDLUN:
838 case SCSI_IOCTL_GET_BUS_NUMBER:
839 return scsi_ioctl(sdp, cmd, p);
841 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
842 if (error != -ENOTTY)
845 return scsi_ioctl(sdp, cmd, p);
848 static void set_media_not_present(struct scsi_disk *sdkp)
850 sdkp->media_present = 0;
852 sdkp->device->changed = 1;
856 * sd_media_changed - check if our medium changed
857 * @disk: kernel device descriptor
859 * Returns 0 if not applicable or no change; 1 if change
861 * Note: this function is invoked from the block subsystem.
863 static int sd_media_changed(struct gendisk *disk)
865 struct scsi_disk *sdkp = scsi_disk(disk);
866 struct scsi_device *sdp = sdkp->device;
867 struct scsi_sense_hdr *sshdr = NULL;
870 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
876 * If the device is offline, don't send any commands - just pretend as
877 * if the command failed. If the device ever comes back online, we
878 * can deal with it then. It is only because of unrecoverable errors
879 * that we would ever take a device offline in the first place.
881 if (!scsi_device_online(sdp)) {
882 set_media_not_present(sdkp);
888 * Using TEST_UNIT_READY enables differentiation between drive with
889 * no cartridge loaded - NOT READY, drive with changed cartridge -
890 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
892 * Drives that auto spin down. eg iomega jaz 1G, will be started
893 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
894 * sd_revalidate() is called.
898 if (scsi_block_when_processing_errors(sdp)) {
899 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
900 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
905 * Unable to test, unit probably not ready. This usually
906 * means there is no disc in the drive. Mark as changed,
907 * and we will figure it out later once the drive is
910 if (retval || (scsi_sense_valid(sshdr) &&
911 /* 0x3a is medium not present */
912 sshdr->asc == 0x3a)) {
913 set_media_not_present(sdkp);
919 * For removable scsi disk we have to recognise the presence
920 * of a disk in the drive. This is kept in the struct scsi_disk
921 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
923 sdkp->media_present = 1;
925 retval = sdp->changed;
928 if (retval != sdkp->previous_state)
929 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
930 sdkp->previous_state = retval;
935 static int sd_sync_cache(struct scsi_disk *sdkp)
938 struct scsi_device *sdp = sdkp->device;
939 struct scsi_sense_hdr sshdr;
941 if (!scsi_device_online(sdp))
945 for (retries = 3; retries > 0; --retries) {
946 unsigned char cmd[10] = { 0 };
948 cmd[0] = SYNCHRONIZE_CACHE;
950 * Leave the rest of the command zero to indicate
953 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
954 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
960 sd_print_result(sdkp, res);
961 if (driver_byte(res) & DRIVER_SENSE)
962 sd_print_sense_hdr(sdkp, &sshdr);
970 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
972 rq->cmd_type = REQ_TYPE_BLOCK_PC;
973 rq->timeout = SD_TIMEOUT;
974 rq->retries = SD_MAX_RETRIES;
975 rq->cmd[0] = SYNCHRONIZE_CACHE;
979 static void sd_rescan(struct device *dev)
981 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
984 revalidate_disk(sdkp->disk);
992 * This gets directly called from VFS. When the ioctl
993 * is not recognized we go back to the other translation paths.
995 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
996 unsigned int cmd, unsigned long arg)
998 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1001 * If we are in the middle of error recovery, don't let anyone
1002 * else try and use this device. Also, if error recovery fails, it
1003 * may try and take the device offline, in which case all further
1004 * access to the device is prohibited.
1006 if (!scsi_block_when_processing_errors(sdev))
1009 if (sdev->host->hostt->compat_ioctl) {
1012 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1018 * Let the static ioctl translation table take care of it.
1020 return -ENOIOCTLCMD;
1024 static const struct block_device_operations sd_fops = {
1025 .owner = THIS_MODULE,
1027 .release = sd_release,
1028 .locked_ioctl = sd_ioctl,
1029 .getgeo = sd_getgeo,
1030 #ifdef CONFIG_COMPAT
1031 .compat_ioctl = sd_compat_ioctl,
1033 .media_changed = sd_media_changed,
1034 .revalidate_disk = sd_revalidate_disk,
1037 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1039 u64 start_lba = blk_rq_pos(scmd->request);
1040 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1044 if (!blk_fs_request(scmd->request))
1047 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1048 SCSI_SENSE_BUFFERSIZE,
1053 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1056 if (scmd->device->sector_size < 512) {
1057 /* only legitimate sector_size here is 256 */
1061 /* be careful ... don't want any overflows */
1062 u64 factor = scmd->device->sector_size / 512;
1063 do_div(start_lba, factor);
1064 do_div(end_lba, factor);
1067 /* The bad lba was reported incorrectly, we have no idea where
1070 if (bad_lba < start_lba || bad_lba >= end_lba)
1073 /* This computation should always be done in terms of
1074 * the resolution of the device's medium.
1076 return (bad_lba - start_lba) * scmd->device->sector_size;
1080 * sd_done - bottom half handler: called when the lower level
1081 * driver has completed (successfully or otherwise) a scsi command.
1082 * @SCpnt: mid-level's per command structure.
1084 * Note: potentially run from within an ISR. Must not block.
1086 static int sd_done(struct scsi_cmnd *SCpnt)
1088 int result = SCpnt->result;
1089 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1090 struct scsi_sense_hdr sshdr;
1091 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1092 int sense_valid = 0;
1093 int sense_deferred = 0;
1096 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1098 sense_deferred = scsi_sense_is_deferred(&sshdr);
1100 #ifdef CONFIG_SCSI_LOGGING
1101 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1103 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1104 "sd_done: sb[respc,sk,asc,"
1105 "ascq]=%x,%x,%x,%x\n",
1106 sshdr.response_code,
1107 sshdr.sense_key, sshdr.asc,
1111 if (driver_byte(result) != DRIVER_SENSE &&
1112 (!sense_valid || sense_deferred))
1115 switch (sshdr.sense_key) {
1116 case HARDWARE_ERROR:
1118 good_bytes = sd_completed_bytes(SCpnt);
1120 case RECOVERED_ERROR:
1121 good_bytes = scsi_bufflen(SCpnt);
1124 /* This indicates a false check condition, so ignore it. An
1125 * unknown amount of data was transferred so treat it as an
1128 scsi_print_sense("sd", SCpnt);
1130 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1132 case ABORTED_COMMAND:
1133 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1134 scsi_print_result(SCpnt);
1135 scsi_print_sense("sd", SCpnt);
1136 good_bytes = sd_completed_bytes(SCpnt);
1139 case ILLEGAL_REQUEST:
1140 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1141 scsi_print_result(SCpnt);
1142 scsi_print_sense("sd", SCpnt);
1143 good_bytes = sd_completed_bytes(SCpnt);
1150 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1151 sd_dif_complete(SCpnt, good_bytes);
1153 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1154 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd)
1155 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1160 static int media_not_present(struct scsi_disk *sdkp,
1161 struct scsi_sense_hdr *sshdr)
1164 if (!scsi_sense_valid(sshdr))
1166 /* not invoked for commands that could return deferred errors */
1167 if (sshdr->sense_key != NOT_READY &&
1168 sshdr->sense_key != UNIT_ATTENTION)
1170 if (sshdr->asc != 0x3A) /* medium not present */
1173 set_media_not_present(sdkp);
1178 * spinup disk - called only in sd_revalidate_disk()
1181 sd_spinup_disk(struct scsi_disk *sdkp)
1183 unsigned char cmd[10];
1184 unsigned long spintime_expire = 0;
1185 int retries, spintime;
1186 unsigned int the_result;
1187 struct scsi_sense_hdr sshdr;
1188 int sense_valid = 0;
1192 /* Spin up drives, as required. Only do this at boot time */
1193 /* Spinup needs to be done for module loads too. */
1198 cmd[0] = TEST_UNIT_READY;
1199 memset((void *) &cmd[1], 0, 9);
1201 the_result = scsi_execute_req(sdkp->device, cmd,
1204 SD_MAX_RETRIES, NULL);
1207 * If the drive has indicated to us that it
1208 * doesn't have any media in it, don't bother
1209 * with any more polling.
1211 if (media_not_present(sdkp, &sshdr))
1215 sense_valid = scsi_sense_valid(&sshdr);
1217 } while (retries < 3 &&
1218 (!scsi_status_is_good(the_result) ||
1219 ((driver_byte(the_result) & DRIVER_SENSE) &&
1220 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1222 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1223 /* no sense, TUR either succeeded or failed
1224 * with a status error */
1225 if(!spintime && !scsi_status_is_good(the_result)) {
1226 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1227 sd_print_result(sdkp, the_result);
1233 * The device does not want the automatic start to be issued.
1235 if (sdkp->device->no_start_on_add)
1238 if (sense_valid && sshdr.sense_key == NOT_READY) {
1239 if (sshdr.asc == 4 && sshdr.ascq == 3)
1240 break; /* manual intervention required */
1241 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1242 break; /* standby */
1243 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1244 break; /* unavailable */
1246 * Issue command to spin up drive when not ready
1249 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1250 cmd[0] = START_STOP;
1251 cmd[1] = 1; /* Return immediately */
1252 memset((void *) &cmd[2], 0, 8);
1253 cmd[4] = 1; /* Start spin cycle */
1254 if (sdkp->device->start_stop_pwr_cond)
1256 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1258 SD_TIMEOUT, SD_MAX_RETRIES,
1260 spintime_expire = jiffies + 100 * HZ;
1263 /* Wait 1 second for next try */
1268 * Wait for USB flash devices with slow firmware.
1269 * Yes, this sense key/ASC combination shouldn't
1270 * occur here. It's characteristic of these devices.
1272 } else if (sense_valid &&
1273 sshdr.sense_key == UNIT_ATTENTION &&
1274 sshdr.asc == 0x28) {
1276 spintime_expire = jiffies + 5 * HZ;
1279 /* Wait 1 second for next try */
1282 /* we don't understand the sense code, so it's
1283 * probably pointless to loop */
1285 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1286 sd_print_sense_hdr(sdkp, &sshdr);
1291 } while (spintime && time_before_eq(jiffies, spintime_expire));
1294 if (scsi_status_is_good(the_result))
1297 printk("not responding...\n");
1303 * Determine whether disk supports Data Integrity Field.
1305 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1307 struct scsi_device *sdp = sdkp->device;
1310 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1313 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1315 if (type == sdkp->protection_type || !sdkp->first_scan)
1318 sdkp->protection_type = type;
1320 if (type > SD_DIF_TYPE3_PROTECTION) {
1321 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1322 "protection type %u. Disabling disk!\n", type);
1327 if (scsi_host_dif_capable(sdp->host, type))
1328 sd_printk(KERN_NOTICE, sdkp,
1329 "Enabling DIF Type %u protection\n", type);
1331 sd_printk(KERN_NOTICE, sdkp,
1332 "Disabling DIF Type %u protection\n", type);
1335 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1336 struct scsi_sense_hdr *sshdr, int sense_valid,
1339 sd_print_result(sdkp, the_result);
1340 if (driver_byte(the_result) & DRIVER_SENSE)
1341 sd_print_sense_hdr(sdkp, sshdr);
1343 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1346 * Set dirty bit for removable devices if not ready -
1347 * sometimes drives will not report this properly.
1349 if (sdp->removable &&
1350 sense_valid && sshdr->sense_key == NOT_READY)
1354 * We used to set media_present to 0 here to indicate no media
1355 * in the drive, but some drives fail read capacity even with
1356 * media present, so we can't do that.
1358 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1362 #if RC16_LEN > SD_BUF_SIZE
1363 #error RC16_LEN must not be more than SD_BUF_SIZE
1366 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1367 unsigned char *buffer)
1369 unsigned char cmd[16];
1370 struct scsi_sense_hdr sshdr;
1371 int sense_valid = 0;
1374 unsigned int alignment;
1375 unsigned long long lba;
1376 unsigned sector_size;
1380 cmd[0] = SERVICE_ACTION_IN;
1381 cmd[1] = SAI_READ_CAPACITY_16;
1383 memset(buffer, 0, RC16_LEN);
1385 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1386 buffer, RC16_LEN, &sshdr,
1387 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1389 if (media_not_present(sdkp, &sshdr))
1393 sense_valid = scsi_sense_valid(&sshdr);
1395 sshdr.sense_key == ILLEGAL_REQUEST &&
1396 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1398 /* Invalid Command Operation Code or
1399 * Invalid Field in CDB, just retry
1400 * silently with RC10 */
1405 } while (the_result && retries);
1408 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1409 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1413 sector_size = get_unaligned_be32(&buffer[8]);
1414 lba = get_unaligned_be64(&buffer[0]);
1416 sd_read_protection_type(sdkp, buffer);
1418 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1419 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1420 "kernel compiled with support for large block "
1426 /* Logical blocks per physical block exponent */
1427 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1429 /* Lowest aligned logical block */
1430 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1431 blk_queue_alignment_offset(sdp->request_queue, alignment);
1432 if (alignment && sdkp->first_scan)
1433 sd_printk(KERN_NOTICE, sdkp,
1434 "physical block alignment offset: %u\n", alignment);
1436 sdkp->capacity = lba + 1;
1440 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1441 unsigned char *buffer)
1443 unsigned char cmd[16];
1444 struct scsi_sense_hdr sshdr;
1445 int sense_valid = 0;
1449 unsigned sector_size;
1452 cmd[0] = READ_CAPACITY;
1453 memset(&cmd[1], 0, 9);
1454 memset(buffer, 0, 8);
1456 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1458 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1460 if (media_not_present(sdkp, &sshdr))
1464 sense_valid = scsi_sense_valid(&sshdr);
1467 } while (the_result && retries);
1470 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1471 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1475 sector_size = get_unaligned_be32(&buffer[4]);
1476 lba = get_unaligned_be32(&buffer[0]);
1478 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1479 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1480 "kernel compiled with support for large block "
1486 sdkp->capacity = lba + 1;
1487 sdkp->hw_sector_size = sector_size;
1491 static int sd_try_rc16_first(struct scsi_device *sdp)
1493 if (sdp->scsi_level > SCSI_SPC_2)
1495 if (scsi_device_protection(sdp))
1501 * read disk capacity
1504 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1507 struct scsi_device *sdp = sdkp->device;
1508 sector_t old_capacity = sdkp->capacity;
1510 if (sd_try_rc16_first(sdp)) {
1511 sector_size = read_capacity_16(sdkp, sdp, buffer);
1512 if (sector_size == -EOVERFLOW)
1514 if (sector_size == -ENODEV)
1516 if (sector_size < 0)
1517 sector_size = read_capacity_10(sdkp, sdp, buffer);
1518 if (sector_size < 0)
1521 sector_size = read_capacity_10(sdkp, sdp, buffer);
1522 if (sector_size == -EOVERFLOW)
1524 if (sector_size < 0)
1526 if ((sizeof(sdkp->capacity) > 4) &&
1527 (sdkp->capacity > 0xffffffffULL)) {
1528 int old_sector_size = sector_size;
1529 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1530 "Trying to use READ CAPACITY(16).\n");
1531 sector_size = read_capacity_16(sdkp, sdp, buffer);
1532 if (sector_size < 0) {
1533 sd_printk(KERN_NOTICE, sdkp,
1534 "Using 0xffffffff as device size\n");
1535 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1536 sector_size = old_sector_size;
1542 /* Some devices are known to return the total number of blocks,
1543 * not the highest block number. Some devices have versions
1544 * which do this and others which do not. Some devices we might
1545 * suspect of doing this but we don't know for certain.
1547 * If we know the reported capacity is wrong, decrement it. If
1548 * we can only guess, then assume the number of blocks is even
1549 * (usually true but not always) and err on the side of lowering
1552 if (sdp->fix_capacity ||
1553 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1554 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1555 "from its reported value: %llu\n",
1556 (unsigned long long) sdkp->capacity);
1561 if (sector_size == 0) {
1563 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1567 if (sector_size != 512 &&
1568 sector_size != 1024 &&
1569 sector_size != 2048 &&
1570 sector_size != 4096 &&
1571 sector_size != 256) {
1572 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1575 * The user might want to re-format the drive with
1576 * a supported sectorsize. Once this happens, it
1577 * would be relatively trivial to set the thing up.
1578 * For this reason, we leave the thing in the table.
1582 * set a bogus sector size so the normal read/write
1583 * logic in the block layer will eventually refuse any
1584 * request on this device without tripping over power
1585 * of two sector size assumptions
1589 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1592 char cap_str_2[10], cap_str_10[10];
1593 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1595 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1597 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1598 sizeof(cap_str_10));
1600 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1601 sd_printk(KERN_NOTICE, sdkp,
1602 "%llu %d-byte logical blocks: (%s/%s)\n",
1603 (unsigned long long)sdkp->capacity,
1604 sector_size, cap_str_10, cap_str_2);
1606 if (sdkp->hw_sector_size != sector_size)
1607 sd_printk(KERN_NOTICE, sdkp,
1608 "%u-byte physical blocks\n",
1609 sdkp->hw_sector_size);
1613 /* Rescale capacity to 512-byte units */
1614 if (sector_size == 4096)
1615 sdkp->capacity <<= 3;
1616 else if (sector_size == 2048)
1617 sdkp->capacity <<= 2;
1618 else if (sector_size == 1024)
1619 sdkp->capacity <<= 1;
1620 else if (sector_size == 256)
1621 sdkp->capacity >>= 1;
1623 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1624 sdkp->device->sector_size = sector_size;
1627 /* called with buffer of length 512 */
1629 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1630 unsigned char *buffer, int len, struct scsi_mode_data *data,
1631 struct scsi_sense_hdr *sshdr)
1633 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1634 SD_TIMEOUT, SD_MAX_RETRIES, data,
1639 * read write protect setting, if possible - called only in sd_revalidate_disk()
1640 * called with buffer of length SD_BUF_SIZE
1643 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1646 struct scsi_device *sdp = sdkp->device;
1647 struct scsi_mode_data data;
1648 int old_wp = sdkp->write_prot;
1650 set_disk_ro(sdkp->disk, 0);
1651 if (sdp->skip_ms_page_3f) {
1652 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1656 if (sdp->use_192_bytes_for_3f) {
1657 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1660 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1661 * We have to start carefully: some devices hang if we ask
1662 * for more than is available.
1664 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1667 * Second attempt: ask for page 0 When only page 0 is
1668 * implemented, a request for page 3F may return Sense Key
1669 * 5: Illegal Request, Sense Code 24: Invalid field in
1672 if (!scsi_status_is_good(res))
1673 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1676 * Third attempt: ask 255 bytes, as we did earlier.
1678 if (!scsi_status_is_good(res))
1679 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1683 if (!scsi_status_is_good(res)) {
1684 sd_printk(KERN_WARNING, sdkp,
1685 "Test WP failed, assume Write Enabled\n");
1687 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1688 set_disk_ro(sdkp->disk, sdkp->write_prot);
1689 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1690 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1691 sdkp->write_prot ? "on" : "off");
1692 sd_printk(KERN_DEBUG, sdkp,
1693 "Mode Sense: %02x %02x %02x %02x\n",
1694 buffer[0], buffer[1], buffer[2], buffer[3]);
1700 * sd_read_cache_type - called only from sd_revalidate_disk()
1701 * called with buffer of length SD_BUF_SIZE
1704 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1707 struct scsi_device *sdp = sdkp->device;
1711 struct scsi_mode_data data;
1712 struct scsi_sense_hdr sshdr;
1713 int old_wce = sdkp->WCE;
1714 int old_rcd = sdkp->RCD;
1715 int old_dpofua = sdkp->DPOFUA;
1717 if (sdp->skip_ms_page_8)
1720 if (sdp->type == TYPE_RBC) {
1728 /* cautiously ask */
1729 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1731 if (!scsi_status_is_good(res))
1734 if (!data.header_length) {
1736 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1739 /* that went OK, now ask for the proper length */
1743 * We're only interested in the first three bytes, actually.
1744 * But the data cache page is defined for the first 20.
1751 /* Take headers and block descriptors into account */
1752 len += data.header_length + data.block_descriptor_length;
1753 if (len > SD_BUF_SIZE)
1757 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1759 if (scsi_status_is_good(res)) {
1760 int offset = data.header_length + data.block_descriptor_length;
1762 if (offset >= SD_BUF_SIZE - 2) {
1763 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1767 if ((buffer[offset] & 0x3f) != modepage) {
1768 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1772 if (modepage == 8) {
1773 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1774 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1776 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1780 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1781 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1782 sd_printk(KERN_NOTICE, sdkp,
1783 "Uses READ/WRITE(6), disabling FUA\n");
1787 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1788 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1789 sd_printk(KERN_NOTICE, sdkp,
1790 "Write cache: %s, read cache: %s, %s\n",
1791 sdkp->WCE ? "enabled" : "disabled",
1792 sdkp->RCD ? "disabled" : "enabled",
1793 sdkp->DPOFUA ? "supports DPO and FUA"
1794 : "doesn't support DPO or FUA");
1800 if (scsi_sense_valid(&sshdr) &&
1801 sshdr.sense_key == ILLEGAL_REQUEST &&
1802 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1803 /* Invalid field in CDB */
1804 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1806 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1809 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1816 * The ATO bit indicates whether the DIF application tag is available
1817 * for use by the operating system.
1819 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1822 struct scsi_device *sdp = sdkp->device;
1823 struct scsi_mode_data data;
1824 struct scsi_sense_hdr sshdr;
1826 if (sdp->type != TYPE_DISK)
1829 if (sdkp->protection_type == 0)
1832 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1833 SD_MAX_RETRIES, &data, &sshdr);
1835 if (!scsi_status_is_good(res) || !data.header_length ||
1837 sd_printk(KERN_WARNING, sdkp,
1838 "getting Control mode page failed, assume no ATO\n");
1840 if (scsi_sense_valid(&sshdr))
1841 sd_print_sense_hdr(sdkp, &sshdr);
1846 offset = data.header_length + data.block_descriptor_length;
1848 if ((buffer[offset] & 0x3f) != 0x0a) {
1849 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1853 if ((buffer[offset + 5] & 0x80) == 0)
1862 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1863 * @disk: disk to query
1865 static void sd_read_block_limits(struct scsi_disk *sdkp)
1867 unsigned int sector_sz = sdkp->device->sector_size;
1870 /* Block Limits VPD */
1871 buffer = scsi_get_vpd_page(sdkp->device, 0xb0);
1876 blk_queue_io_min(sdkp->disk->queue,
1877 get_unaligned_be16(&buffer[6]) * sector_sz);
1878 blk_queue_io_opt(sdkp->disk->queue,
1879 get_unaligned_be32(&buffer[12]) * sector_sz);
1885 * sd_read_block_characteristics - Query block dev. characteristics
1886 * @disk: disk to query
1888 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
1893 /* Block Device Characteristics VPD */
1894 buffer = scsi_get_vpd_page(sdkp->device, 0xb1);
1899 rot = get_unaligned_be16(&buffer[4]);
1902 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
1907 static int sd_try_extended_inquiry(struct scsi_device *sdp)
1910 * Although VPD inquiries can go to SCSI-2 type devices,
1911 * some USB ones crash on receiving them, and the pages
1912 * we currently ask for are for SPC-3 and beyond
1914 if (sdp->scsi_level > SCSI_SPC_2)
1920 * sd_revalidate_disk - called the first time a new disk is seen,
1921 * performs disk spin up, read_capacity, etc.
1922 * @disk: struct gendisk we care about
1924 static int sd_revalidate_disk(struct gendisk *disk)
1926 struct scsi_disk *sdkp = scsi_disk(disk);
1927 struct scsi_device *sdp = sdkp->device;
1928 unsigned char *buffer;
1931 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1932 "sd_revalidate_disk\n"));
1935 * If the device is offline, don't try and read capacity or any
1936 * of the other niceties.
1938 if (!scsi_device_online(sdp))
1941 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1943 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1944 "allocation failure.\n");
1948 sd_spinup_disk(sdkp);
1951 * Without media there is no reason to ask; moreover, some devices
1952 * react badly if we do.
1954 if (sdkp->media_present) {
1955 sd_read_capacity(sdkp, buffer);
1957 if (sd_try_extended_inquiry(sdp)) {
1958 sd_read_block_limits(sdkp);
1959 sd_read_block_characteristics(sdkp);
1962 sd_read_write_protect_flag(sdkp, buffer);
1963 sd_read_cache_type(sdkp, buffer);
1964 sd_read_app_tag_own(sdkp, buffer);
1967 sdkp->first_scan = 0;
1970 * We now have all cache related info, determine how we deal
1971 * with ordered requests. Note that as the current SCSI
1972 * dispatch function can alter request order, we cannot use
1973 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1976 ordered = sdkp->DPOFUA
1977 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1979 ordered = QUEUE_ORDERED_DRAIN;
1981 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1983 set_capacity(disk, sdkp->capacity);
1991 * sd_format_disk_name - format disk name
1992 * @prefix: name prefix - ie. "sd" for SCSI disks
1993 * @index: index of the disk to format name for
1994 * @buf: output buffer
1995 * @buflen: length of the output buffer
1997 * SCSI disk names starts at sda. The 26th device is sdz and the
1998 * 27th is sdaa. The last one for two lettered suffix is sdzz
1999 * which is followed by sdaaa.
2001 * This is basically 26 base counting with one extra 'nil' entry
2002 * at the beggining from the second digit on and can be
2003 * determined using similar method as 26 base conversion with the
2004 * index shifted -1 after each digit is computed.
2010 * 0 on success, -errno on failure.
2012 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2014 const int base = 'z' - 'a' + 1;
2015 char *begin = buf + strlen(prefix);
2016 char *end = buf + buflen;
2026 *--p = 'a' + (index % unit);
2027 index = (index / unit) - 1;
2028 } while (index >= 0);
2030 memmove(begin, p, end - p);
2031 memcpy(buf, prefix, strlen(prefix));
2037 * The asynchronous part of sd_probe
2039 static void sd_probe_async(void *data, async_cookie_t cookie)
2041 struct scsi_disk *sdkp = data;
2042 struct scsi_device *sdp;
2049 index = sdkp->index;
2050 dev = &sdp->sdev_gendev;
2052 gd->major = sd_major((index & 0xf0) >> 4);
2053 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2054 gd->minors = SD_MINORS;
2056 gd->fops = &sd_fops;
2057 gd->private_data = &sdkp->driver;
2058 gd->queue = sdkp->device->request_queue;
2060 /* defaults, until the device tells us otherwise */
2061 sdp->sector_size = 512;
2063 sdkp->media_present = 1;
2064 sdkp->write_prot = 0;
2068 sdkp->first_scan = 1;
2070 sd_revalidate_disk(gd);
2072 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2074 gd->driverfs_dev = &sdp->sdev_gendev;
2075 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
2077 gd->flags |= GENHD_FL_REMOVABLE;
2079 dev_set_drvdata(dev, sdkp);
2081 sd_dif_config_host(sdkp);
2083 sd_revalidate_disk(gd);
2085 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2086 sdp->removable ? "removable " : "");
2087 put_device(&sdkp->dev);
2091 * sd_probe - called during driver initialization and whenever a
2092 * new scsi device is attached to the system. It is called once
2093 * for each scsi device (not just disks) present.
2094 * @dev: pointer to device object
2096 * Returns 0 if successful (or not interested in this scsi device
2097 * (e.g. scanner)); 1 when there is an error.
2099 * Note: this function is invoked from the scsi mid-level.
2100 * This function sets up the mapping between a given
2101 * <host,channel,id,lun> (found in sdp) and new device name
2102 * (e.g. /dev/sda). More precisely it is the block device major
2103 * and minor number that is chosen here.
2105 * Assume sd_attach is not re-entrant (for time being)
2106 * Also think about sd_attach() and sd_remove() running coincidentally.
2108 static int sd_probe(struct device *dev)
2110 struct scsi_device *sdp = to_scsi_device(dev);
2111 struct scsi_disk *sdkp;
2117 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2120 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2124 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2128 gd = alloc_disk(SD_MINORS);
2133 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2136 spin_lock(&sd_index_lock);
2137 error = ida_get_new(&sd_index_ida, &index);
2138 spin_unlock(&sd_index_lock);
2139 } while (error == -EAGAIN);
2144 if (index >= SD_MAX_DISKS) {
2146 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2147 goto out_free_index;
2150 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2152 goto out_free_index;
2155 sdkp->driver = &sd_template;
2157 sdkp->index = index;
2159 sdkp->previous_state = 1;
2161 if (!sdp->request_queue->rq_timeout) {
2162 if (sdp->type != TYPE_MOD)
2163 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2165 blk_queue_rq_timeout(sdp->request_queue,
2169 device_initialize(&sdkp->dev);
2170 sdkp->dev.parent = &sdp->sdev_gendev;
2171 sdkp->dev.class = &sd_disk_class;
2172 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2174 if (device_add(&sdkp->dev))
2175 goto out_free_index;
2177 get_device(&sdp->sdev_gendev);
2179 get_device(&sdkp->dev); /* prevent release before async_schedule */
2180 async_schedule(sd_probe_async, sdkp);
2185 spin_lock(&sd_index_lock);
2186 ida_remove(&sd_index_ida, index);
2187 spin_unlock(&sd_index_lock);
2197 * sd_remove - called whenever a scsi disk (previously recognized by
2198 * sd_probe) is detached from the system. It is called (potentially
2199 * multiple times) during sd module unload.
2200 * @sdp: pointer to mid level scsi device object
2202 * Note: this function is invoked from the scsi mid-level.
2203 * This function potentially frees up a device name (e.g. /dev/sdc)
2204 * that could be re-used by a subsequent sd_probe().
2205 * This function is not called when the built-in sd driver is "exit-ed".
2207 static int sd_remove(struct device *dev)
2209 struct scsi_disk *sdkp;
2211 async_synchronize_full();
2212 sdkp = dev_get_drvdata(dev);
2213 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2214 device_del(&sdkp->dev);
2215 del_gendisk(sdkp->disk);
2218 mutex_lock(&sd_ref_mutex);
2219 dev_set_drvdata(dev, NULL);
2220 put_device(&sdkp->dev);
2221 mutex_unlock(&sd_ref_mutex);
2227 * scsi_disk_release - Called to free the scsi_disk structure
2228 * @dev: pointer to embedded class device
2230 * sd_ref_mutex must be held entering this routine. Because it is
2231 * called on last put, you should always use the scsi_disk_get()
2232 * scsi_disk_put() helpers which manipulate the semaphore directly
2233 * and never do a direct put_device.
2235 static void scsi_disk_release(struct device *dev)
2237 struct scsi_disk *sdkp = to_scsi_disk(dev);
2238 struct gendisk *disk = sdkp->disk;
2240 spin_lock(&sd_index_lock);
2241 ida_remove(&sd_index_ida, sdkp->index);
2242 spin_unlock(&sd_index_lock);
2244 disk->private_data = NULL;
2246 put_device(&sdkp->device->sdev_gendev);
2251 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2253 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2254 struct scsi_sense_hdr sshdr;
2255 struct scsi_device *sdp = sdkp->device;
2259 cmd[4] |= 1; /* START */
2261 if (sdp->start_stop_pwr_cond)
2262 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2264 if (!scsi_device_online(sdp))
2267 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2268 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2270 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2271 sd_print_result(sdkp, res);
2272 if (driver_byte(res) & DRIVER_SENSE)
2273 sd_print_sense_hdr(sdkp, &sshdr);
2280 * Send a SYNCHRONIZE CACHE instruction down to the device through
2281 * the normal SCSI command structure. Wait for the command to
2284 static void sd_shutdown(struct device *dev)
2286 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2289 return; /* this can happen */
2292 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2293 sd_sync_cache(sdkp);
2296 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2297 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2298 sd_start_stop_device(sdkp, 0);
2301 scsi_disk_put(sdkp);
2304 static int sd_suspend(struct device *dev, pm_message_t mesg)
2306 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2310 return 0; /* this can happen */
2313 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2314 ret = sd_sync_cache(sdkp);
2319 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2320 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2321 ret = sd_start_stop_device(sdkp, 0);
2325 scsi_disk_put(sdkp);
2329 static int sd_resume(struct device *dev)
2331 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2334 if (!sdkp->device->manage_start_stop)
2337 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2338 ret = sd_start_stop_device(sdkp, 1);
2341 scsi_disk_put(sdkp);
2346 * init_sd - entry point for this driver (both when built in or when
2349 * Note: this function registers this driver with the scsi mid-level.
2351 static int __init init_sd(void)
2353 int majors = 0, i, err;
2355 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2357 for (i = 0; i < SD_MAJORS; i++)
2358 if (register_blkdev(sd_major(i), "sd") == 0)
2364 err = class_register(&sd_disk_class);
2368 err = scsi_register_driver(&sd_template.gendrv);
2372 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2374 if (!sd_cdb_cache) {
2375 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2379 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2381 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2388 kmem_cache_destroy(sd_cdb_cache);
2391 class_unregister(&sd_disk_class);
2393 for (i = 0; i < SD_MAJORS; i++)
2394 unregister_blkdev(sd_major(i), "sd");
2399 * exit_sd - exit point for this driver (when it is a module).
2401 * Note: this function unregisters this driver from the scsi mid-level.
2403 static void __exit exit_sd(void)
2407 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2409 mempool_destroy(sd_cdb_pool);
2410 kmem_cache_destroy(sd_cdb_cache);
2412 scsi_unregister_driver(&sd_template.gendrv);
2413 class_unregister(&sd_disk_class);
2415 for (i = 0; i < SD_MAJORS; i++)
2416 unregister_blkdev(sd_major(i), "sd");
2419 module_init(init_sd);
2420 module_exit(exit_sd);
2422 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2423 struct scsi_sense_hdr *sshdr)
2425 sd_printk(KERN_INFO, sdkp, "");
2426 scsi_show_sense_hdr(sshdr);
2427 sd_printk(KERN_INFO, sdkp, "");
2428 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2431 static void sd_print_result(struct scsi_disk *sdkp, int result)
2433 sd_printk(KERN_INFO, sdkp, "");
2434 scsi_show_result(result);