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 <asm/uaccess.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_eh.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
65 MODULE_AUTHOR("Eric Youngdale");
66 MODULE_DESCRIPTION("SCSI disk (sd) driver");
67 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
86 static DEFINE_IDR(sd_index_idr);
87 static DEFINE_SPINLOCK(sd_index_lock);
89 /* This semaphore is used to mediate the 0->1 reference get in the
90 * face of object destruction (i.e. we can't allow a get on an
91 * object after last put) */
92 static DEFINE_MUTEX(sd_ref_mutex);
94 static const char *sd_cache_types[] = {
95 "write through", "none", "write back",
96 "write back, no read (daft)"
99 static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
102 int i, ct = -1, rcd, wce, sp;
103 struct scsi_disk *sdkp = to_scsi_disk(cdev);
104 struct scsi_device *sdp = sdkp->device;
107 struct scsi_mode_data data;
108 struct scsi_sense_hdr sshdr;
111 if (sdp->type != TYPE_DISK)
112 /* no cache control on RBC devices; theoretically they
113 * can do it, but there's probably so many exceptions
114 * it's not worth the risk */
117 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
118 const int len = strlen(sd_cache_types[i]);
119 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
127 rcd = ct & 0x01 ? 1 : 0;
128 wce = ct & 0x02 ? 1 : 0;
129 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
130 SD_MAX_RETRIES, &data, NULL))
132 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
133 data.block_descriptor_length);
134 buffer_data = buffer + data.header_length +
135 data.block_descriptor_length;
136 buffer_data[2] &= ~0x05;
137 buffer_data[2] |= wce << 2 | rcd;
138 sp = buffer_data[0] & 0x80 ? 1 : 0;
140 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
141 SD_MAX_RETRIES, &data, &sshdr)) {
142 if (scsi_sense_valid(&sshdr))
143 sd_print_sense_hdr(sdkp, &sshdr);
146 sd_revalidate_disk(sdkp->disk);
150 static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
153 struct scsi_disk *sdkp = to_scsi_disk(cdev);
154 struct scsi_device *sdp = sdkp->device;
156 if (!capable(CAP_SYS_ADMIN))
159 if (sdp->type != TYPE_DISK)
162 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
167 static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
169 struct scsi_disk *sdkp = to_scsi_disk(cdev);
170 int ct = sdkp->RCD + 2*sdkp->WCE;
172 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
175 static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
177 struct scsi_disk *sdkp = to_scsi_disk(cdev);
179 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
182 static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
184 struct scsi_disk *sdkp = to_scsi_disk(cdev);
186 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
189 static struct class_device_attribute sd_disk_attrs[] = {
190 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
191 sd_store_cache_type),
192 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
193 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
194 sd_store_allow_restart),
198 static struct class sd_disk_class = {
200 .owner = THIS_MODULE,
201 .release = scsi_disk_release,
202 .class_dev_attrs = sd_disk_attrs,
205 static struct scsi_driver sd_template = {
206 .owner = THIS_MODULE,
211 .shutdown = sd_shutdown,
214 .init_command = sd_init_command,
215 .issue_flush = sd_issue_flush,
219 * Device no to disk mapping:
221 * major disc2 disc p1
222 * |............|.............|....|....| <- dev_t
225 * Inside a major, we have 16k disks, however mapped non-
226 * contiguously. The first 16 disks are for major0, the next
227 * ones with major1, ... Disk 256 is for major0 again, disk 272
229 * As we stay compatible with our numbering scheme, we can reuse
230 * the well-know SCSI majors 8, 65--71, 136--143.
232 static int sd_major(int major_idx)
236 return SCSI_DISK0_MAJOR;
238 return SCSI_DISK1_MAJOR + major_idx - 1;
240 return SCSI_DISK8_MAJOR + major_idx - 8;
243 return 0; /* shut up gcc */
247 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
249 return container_of(disk->private_data, struct scsi_disk, driver);
252 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
254 struct scsi_disk *sdkp = NULL;
256 if (disk->private_data) {
257 sdkp = scsi_disk(disk);
258 if (scsi_device_get(sdkp->device) == 0)
259 class_device_get(&sdkp->cdev);
266 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
268 struct scsi_disk *sdkp;
270 mutex_lock(&sd_ref_mutex);
271 sdkp = __scsi_disk_get(disk);
272 mutex_unlock(&sd_ref_mutex);
276 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
278 struct scsi_disk *sdkp;
280 mutex_lock(&sd_ref_mutex);
281 sdkp = dev_get_drvdata(dev);
283 sdkp = __scsi_disk_get(sdkp->disk);
284 mutex_unlock(&sd_ref_mutex);
288 static void scsi_disk_put(struct scsi_disk *sdkp)
290 struct scsi_device *sdev = sdkp->device;
292 mutex_lock(&sd_ref_mutex);
293 class_device_put(&sdkp->cdev);
294 scsi_device_put(sdev);
295 mutex_unlock(&sd_ref_mutex);
299 * sd_init_command - build a scsi (read or write) command from
300 * information in the request structure.
301 * @SCpnt: pointer to mid-level's per scsi command structure that
302 * contains request and into which the scsi command is written
304 * Returns 1 if successful and 0 if error (or cannot be done now).
306 static int sd_init_command(struct scsi_cmnd * SCpnt)
308 struct scsi_device *sdp = SCpnt->device;
309 struct request *rq = SCpnt->request;
310 struct gendisk *disk = rq->rq_disk;
311 sector_t block = rq->sector;
312 unsigned int this_count = SCpnt->request_bufflen >> 9;
313 unsigned int timeout = sdp->timeout;
315 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
316 "count=%d\n", disk->disk_name,
317 (unsigned long long)block, this_count));
319 if (!sdp || !scsi_device_online(sdp) ||
320 block + rq->nr_sectors > get_capacity(disk)) {
321 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
323 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
329 * quietly refuse to do anything to a changed disc until
330 * the changed bit has been reset
332 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
335 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
336 disk->disk_name, (unsigned long long)block));
339 * If we have a 1K hardware sectorsize, prevent access to single
340 * 512 byte sectors. In theory we could handle this - in fact
341 * the scsi cdrom driver must be able to handle this because
342 * we typically use 1K blocksizes, and cdroms typically have
343 * 2K hardware sectorsizes. Of course, things are simpler
344 * with the cdrom, since it is read-only. For performance
345 * reasons, the filesystems should be able to handle this
346 * and not force the scsi disk driver to use bounce buffers
349 if (sdp->sector_size == 1024) {
350 if ((block & 1) || (rq->nr_sectors & 1)) {
351 scmd_printk(KERN_ERR, SCpnt,
352 "Bad block number requested\n");
356 this_count = this_count >> 1;
359 if (sdp->sector_size == 2048) {
360 if ((block & 3) || (rq->nr_sectors & 3)) {
361 scmd_printk(KERN_ERR, SCpnt,
362 "Bad block number requested\n");
366 this_count = this_count >> 2;
369 if (sdp->sector_size == 4096) {
370 if ((block & 7) || (rq->nr_sectors & 7)) {
371 scmd_printk(KERN_ERR, SCpnt,
372 "Bad block number requested\n");
376 this_count = this_count >> 3;
379 if (rq_data_dir(rq) == WRITE) {
380 if (!sdp->writeable) {
383 SCpnt->cmnd[0] = WRITE_6;
384 SCpnt->sc_data_direction = DMA_TO_DEVICE;
385 } else if (rq_data_dir(rq) == READ) {
386 SCpnt->cmnd[0] = READ_6;
387 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
389 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
393 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
394 disk->disk_name, (rq_data_dir(rq) == WRITE) ?
395 "writing" : "reading", this_count, rq->nr_sectors));
399 if (block > 0xffffffff) {
400 SCpnt->cmnd[0] += READ_16 - READ_6;
401 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
402 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
403 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
404 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
405 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
406 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
407 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
408 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
409 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
410 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
411 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
412 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
413 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
414 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
415 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
416 SCpnt->device->use_10_for_rw) {
417 if (this_count > 0xffff)
420 SCpnt->cmnd[0] += READ_10 - READ_6;
421 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
422 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
423 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
424 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
425 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
426 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
427 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
428 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
430 if (unlikely(blk_fua_rq(rq))) {
432 * This happens only if this drive failed
433 * 10byte rw command with ILLEGAL_REQUEST
434 * during operation and thus turned off
437 scmd_printk(KERN_ERR, SCpnt,
438 "FUA write on READ/WRITE(6) drive\n");
442 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
443 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
444 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
445 SCpnt->cmnd[4] = (unsigned char) this_count;
448 SCpnt->request_bufflen = this_count * sdp->sector_size;
451 * We shouldn't disconnect in the middle of a sector, so with a dumb
452 * host adapter, it's safe to assume that we can at least transfer
453 * this many bytes between each connect / disconnect.
455 SCpnt->transfersize = sdp->sector_size;
456 SCpnt->underflow = this_count << 9;
457 SCpnt->allowed = SD_MAX_RETRIES;
458 SCpnt->timeout_per_command = timeout;
461 * This is the completion routine we use. This is matched in terms
462 * of capability to this function.
464 SCpnt->done = sd_rw_intr;
467 * This indicates that the command is ready from our end to be
474 * sd_open - open a scsi disk device
475 * @inode: only i_rdev member may be used
476 * @filp: only f_mode and f_flags may be used
478 * Returns 0 if successful. Returns a negated errno value in case
481 * Note: This can be called from a user context (e.g. fsck(1) )
482 * or from within the kernel (e.g. as a result of a mount(1) ).
483 * In the latter case @inode and @filp carry an abridged amount
484 * of information as noted above.
486 static int sd_open(struct inode *inode, struct file *filp)
488 struct gendisk *disk = inode->i_bdev->bd_disk;
489 struct scsi_disk *sdkp;
490 struct scsi_device *sdev;
493 if (!(sdkp = scsi_disk_get(disk)))
497 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name));
502 * If the device is in error recovery, wait until it is done.
503 * If the device is offline, then disallow any access to it.
506 if (!scsi_block_when_processing_errors(sdev))
509 if (sdev->removable || sdkp->write_prot)
510 check_disk_change(inode->i_bdev);
513 * If the drive is empty, just let the open fail.
516 if (sdev->removable && !sdkp->media_present &&
517 !(filp->f_flags & O_NDELAY))
521 * If the device has the write protect tab set, have the open fail
522 * if the user expects to be able to write to the thing.
525 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
529 * It is possible that the disk changing stuff resulted in
530 * the device being taken offline. If this is the case,
531 * report this to the user, and don't pretend that the
532 * open actually succeeded.
535 if (!scsi_device_online(sdev))
538 if (!sdkp->openers++ && sdev->removable) {
539 if (scsi_block_when_processing_errors(sdev))
540 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
551 * sd_release - invoked when the (last) close(2) is called on this
553 * @inode: only i_rdev member may be used
554 * @filp: only f_mode and f_flags may be used
558 * Note: may block (uninterruptible) if error recovery is underway
561 static int sd_release(struct inode *inode, struct file *filp)
563 struct gendisk *disk = inode->i_bdev->bd_disk;
564 struct scsi_disk *sdkp = scsi_disk(disk);
565 struct scsi_device *sdev = sdkp->device;
567 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name));
569 if (!--sdkp->openers && sdev->removable) {
570 if (scsi_block_when_processing_errors(sdev))
571 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
575 * XXX and what if there are packets in flight and this close()
576 * XXX is followed by a "rmmod sd_mod"?
582 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
584 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
585 struct scsi_device *sdp = sdkp->device;
586 struct Scsi_Host *host = sdp->host;
589 /* default to most commonly used values */
590 diskinfo[0] = 0x40; /* 1 << 6 */
591 diskinfo[1] = 0x20; /* 1 << 5 */
592 diskinfo[2] = sdkp->capacity >> 11;
594 /* override with calculated, extended default, or driver values */
595 if (host->hostt->bios_param)
596 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
598 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
600 geo->heads = diskinfo[0];
601 geo->sectors = diskinfo[1];
602 geo->cylinders = diskinfo[2];
607 * sd_ioctl - process an ioctl
608 * @inode: only i_rdev/i_bdev members may be used
609 * @filp: only f_mode and f_flags may be used
610 * @cmd: ioctl command number
611 * @arg: this is third argument given to ioctl(2) system call.
612 * Often contains a pointer.
614 * Returns 0 if successful (some ioctls return postive numbers on
615 * success as well). Returns a negated errno value in case of error.
617 * Note: most ioctls are forward onto the block subsystem or further
618 * down in the scsi subsytem.
620 static int sd_ioctl(struct inode * inode, struct file * filp,
621 unsigned int cmd, unsigned long arg)
623 struct block_device *bdev = inode->i_bdev;
624 struct gendisk *disk = bdev->bd_disk;
625 struct scsi_device *sdp = scsi_disk(disk)->device;
626 void __user *p = (void __user *)arg;
629 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
630 disk->disk_name, cmd));
633 * If we are in the middle of error recovery, don't let anyone
634 * else try and use this device. Also, if error recovery fails, it
635 * may try and take the device offline, in which case all further
636 * access to the device is prohibited.
638 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
639 if (!scsi_block_when_processing_errors(sdp) || !error)
643 * Send SCSI addressing ioctls directly to mid level, send other
644 * ioctls to block level and then onto mid level if they can't be
648 case SCSI_IOCTL_GET_IDLUN:
649 case SCSI_IOCTL_GET_BUS_NUMBER:
650 return scsi_ioctl(sdp, cmd, p);
652 error = scsi_cmd_ioctl(filp, disk, cmd, p);
653 if (error != -ENOTTY)
656 return scsi_ioctl(sdp, cmd, p);
659 static void set_media_not_present(struct scsi_disk *sdkp)
661 sdkp->media_present = 0;
663 sdkp->device->changed = 1;
667 * sd_media_changed - check if our medium changed
668 * @disk: kernel device descriptor
670 * Returns 0 if not applicable or no change; 1 if change
672 * Note: this function is invoked from the block subsystem.
674 static int sd_media_changed(struct gendisk *disk)
676 struct scsi_disk *sdkp = scsi_disk(disk);
677 struct scsi_device *sdp = sdkp->device;
680 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
687 * If the device is offline, don't send any commands - just pretend as
688 * if the command failed. If the device ever comes back online, we
689 * can deal with it then. It is only because of unrecoverable errors
690 * that we would ever take a device offline in the first place.
692 if (!scsi_device_online(sdp))
696 * Using TEST_UNIT_READY enables differentiation between drive with
697 * no cartridge loaded - NOT READY, drive with changed cartridge -
698 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
700 * Drives that auto spin down. eg iomega jaz 1G, will be started
701 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
702 * sd_revalidate() is called.
705 if (scsi_block_when_processing_errors(sdp))
706 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
709 * Unable to test, unit probably not ready. This usually
710 * means there is no disc in the drive. Mark as changed,
711 * and we will figure it out later once the drive is
718 * For removable scsi disk we have to recognise the presence
719 * of a disk in the drive. This is kept in the struct scsi_disk
720 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
722 sdkp->media_present = 1;
724 retval = sdp->changed;
730 set_media_not_present(sdkp);
734 static int sd_sync_cache(struct scsi_disk *sdkp)
737 struct scsi_device *sdp = sdkp->device;
738 struct scsi_sense_hdr sshdr;
740 if (!scsi_device_online(sdp))
744 for (retries = 3; retries > 0; --retries) {
745 unsigned char cmd[10] = { 0 };
747 cmd[0] = SYNCHRONIZE_CACHE;
749 * Leave the rest of the command zero to indicate
752 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
753 SD_TIMEOUT, SD_MAX_RETRIES);
759 sd_print_result(sdkp, res);
760 if (driver_byte(res) & DRIVER_SENSE)
761 sd_print_sense_hdr(sdkp, &sshdr);
767 static int sd_issue_flush(struct device *dev, sector_t *error_sector)
770 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
776 ret = sd_sync_cache(sdkp);
781 static void sd_prepare_flush(request_queue_t *q, struct request *rq)
783 memset(rq->cmd, 0, sizeof(rq->cmd));
784 rq->cmd_type = REQ_TYPE_BLOCK_PC;
785 rq->timeout = SD_TIMEOUT;
786 rq->cmd[0] = SYNCHRONIZE_CACHE;
790 static void sd_rescan(struct device *dev)
792 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
795 sd_revalidate_disk(sdkp->disk);
803 * This gets directly called from VFS. When the ioctl
804 * is not recognized we go back to the other translation paths.
806 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
808 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
809 struct gendisk *disk = bdev->bd_disk;
810 struct scsi_device *sdev = scsi_disk(disk)->device;
813 * If we are in the middle of error recovery, don't let anyone
814 * else try and use this device. Also, if error recovery fails, it
815 * may try and take the device offline, in which case all further
816 * access to the device is prohibited.
818 if (!scsi_block_when_processing_errors(sdev))
821 if (sdev->host->hostt->compat_ioctl) {
824 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
830 * Let the static ioctl translation table take care of it.
836 static struct block_device_operations sd_fops = {
837 .owner = THIS_MODULE,
839 .release = sd_release,
843 .compat_ioctl = sd_compat_ioctl,
845 .media_changed = sd_media_changed,
846 .revalidate_disk = sd_revalidate_disk,
850 * sd_rw_intr - bottom half handler: called when the lower level
851 * driver has completed (successfully or otherwise) a scsi command.
852 * @SCpnt: mid-level's per command structure.
854 * Note: potentially run from within an ISR. Must not block.
856 static void sd_rw_intr(struct scsi_cmnd * SCpnt)
858 int result = SCpnt->result;
859 unsigned int xfer_size = SCpnt->request_bufflen;
860 unsigned int good_bytes = result ? 0 : xfer_size;
861 u64 start_lba = SCpnt->request->sector;
863 struct scsi_sense_hdr sshdr;
865 int sense_deferred = 0;
869 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
871 sense_deferred = scsi_sense_is_deferred(&sshdr);
873 #ifdef CONFIG_SCSI_LOGGING
874 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
875 SCpnt->request->rq_disk->disk_name, result));
877 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
878 "ascq]=%x,%x,%x,%x\n", sshdr.response_code,
879 sshdr.sense_key, sshdr.asc, sshdr.ascq));
882 if (driver_byte(result) != DRIVER_SENSE &&
883 (!sense_valid || sense_deferred))
886 switch (sshdr.sense_key) {
889 if (!blk_fs_request(SCpnt->request))
891 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
892 SCSI_SENSE_BUFFERSIZE,
896 if (xfer_size <= SCpnt->device->sector_size)
898 switch (SCpnt->device->sector_size) {
914 /* Print something here with limiting frequency. */
918 /* This computation should always be done in terms of
919 * the resolution of the device's medium.
921 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
923 case RECOVERED_ERROR:
925 /* Inform the user, but make sure that it's not treated
928 scsi_print_sense("sd", SCpnt);
930 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
931 good_bytes = xfer_size;
933 case ILLEGAL_REQUEST:
934 if (SCpnt->device->use_10_for_rw &&
935 (SCpnt->cmnd[0] == READ_10 ||
936 SCpnt->cmnd[0] == WRITE_10))
937 SCpnt->device->use_10_for_rw = 0;
938 if (SCpnt->device->use_10_for_ms &&
939 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
940 SCpnt->cmnd[0] == MODE_SELECT_10))
941 SCpnt->device->use_10_for_ms = 0;
947 scsi_io_completion(SCpnt, good_bytes);
950 static int media_not_present(struct scsi_disk *sdkp,
951 struct scsi_sense_hdr *sshdr)
954 if (!scsi_sense_valid(sshdr))
956 /* not invoked for commands that could return deferred errors */
957 if (sshdr->sense_key != NOT_READY &&
958 sshdr->sense_key != UNIT_ATTENTION)
960 if (sshdr->asc != 0x3A) /* medium not present */
963 set_media_not_present(sdkp);
968 * spinup disk - called only in sd_revalidate_disk()
971 sd_spinup_disk(struct scsi_disk *sdkp)
973 unsigned char cmd[10];
974 unsigned long spintime_expire = 0;
975 int retries, spintime;
976 unsigned int the_result;
977 struct scsi_sense_hdr sshdr;
982 /* Spin up drives, as required. Only do this at boot time */
983 /* Spinup needs to be done for module loads too. */
988 cmd[0] = TEST_UNIT_READY;
989 memset((void *) &cmd[1], 0, 9);
991 the_result = scsi_execute_req(sdkp->device, cmd,
997 * If the drive has indicated to us that it
998 * doesn't have any media in it, don't bother
999 * with any more polling.
1001 if (media_not_present(sdkp, &sshdr))
1005 sense_valid = scsi_sense_valid(&sshdr);
1007 } while (retries < 3 &&
1008 (!scsi_status_is_good(the_result) ||
1009 ((driver_byte(the_result) & DRIVER_SENSE) &&
1010 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1012 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1013 /* no sense, TUR either succeeded or failed
1014 * with a status error */
1015 if(!spintime && !scsi_status_is_good(the_result)) {
1016 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1017 sd_print_result(sdkp, the_result);
1023 * The device does not want the automatic start to be issued.
1025 if (sdkp->device->no_start_on_add) {
1030 * If manual intervention is required, or this is an
1031 * absent USB storage device, a spinup is meaningless.
1034 sshdr.sense_key == NOT_READY &&
1035 sshdr.asc == 4 && sshdr.ascq == 3) {
1036 break; /* manual intervention required */
1039 * Issue command to spin up drive when not ready
1041 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1043 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1044 cmd[0] = START_STOP;
1045 cmd[1] = 1; /* Return immediately */
1046 memset((void *) &cmd[2], 0, 8);
1047 cmd[4] = 1; /* Start spin cycle */
1048 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1050 SD_TIMEOUT, SD_MAX_RETRIES);
1051 spintime_expire = jiffies + 100 * HZ;
1054 /* Wait 1 second for next try */
1059 * Wait for USB flash devices with slow firmware.
1060 * Yes, this sense key/ASC combination shouldn't
1061 * occur here. It's characteristic of these devices.
1063 } else if (sense_valid &&
1064 sshdr.sense_key == UNIT_ATTENTION &&
1065 sshdr.asc == 0x28) {
1067 spintime_expire = jiffies + 5 * HZ;
1070 /* Wait 1 second for next try */
1073 /* we don't understand the sense code, so it's
1074 * probably pointless to loop */
1076 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1077 sd_print_sense_hdr(sdkp, &sshdr);
1082 } while (spintime && time_before_eq(jiffies, spintime_expire));
1085 if (scsi_status_is_good(the_result))
1088 printk("not responding...\n");
1093 * read disk capacity
1096 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1098 unsigned char cmd[16];
1099 int the_result, retries;
1100 int sector_size = 0;
1102 struct scsi_sense_hdr sshdr;
1103 int sense_valid = 0;
1104 struct scsi_device *sdp = sdkp->device;
1110 memset((void *) cmd, 0, 16);
1111 cmd[0] = SERVICE_ACTION_IN;
1112 cmd[1] = SAI_READ_CAPACITY_16;
1114 memset((void *) buffer, 0, 12);
1116 cmd[0] = READ_CAPACITY;
1117 memset((void *) &cmd[1], 0, 9);
1118 memset((void *) buffer, 0, 8);
1121 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1122 buffer, longrc ? 12 : 8, &sshdr,
1123 SD_TIMEOUT, SD_MAX_RETRIES);
1125 if (media_not_present(sdkp, &sshdr))
1129 sense_valid = scsi_sense_valid(&sshdr);
1132 } while (the_result && retries);
1134 if (the_result && !longrc) {
1135 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1136 sd_print_result(sdkp, the_result);
1137 if (driver_byte(the_result) & DRIVER_SENSE)
1138 sd_print_sense_hdr(sdkp, &sshdr);
1140 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1142 /* Set dirty bit for removable devices if not ready -
1143 * sometimes drives will not report this properly. */
1144 if (sdp->removable &&
1145 sense_valid && sshdr.sense_key == NOT_READY)
1148 /* Either no media are present but the drive didn't tell us,
1149 or they are present but the read capacity command fails */
1150 /* sdkp->media_present = 0; -- not always correct */
1151 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1154 } else if (the_result && longrc) {
1155 /* READ CAPACITY(16) has been failed */
1156 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1157 sd_print_result(sdkp, the_result);
1158 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1160 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1165 sector_size = (buffer[4] << 24) |
1166 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1167 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1168 buffer[2] == 0xff && buffer[3] == 0xff) {
1169 if(sizeof(sdkp->capacity) > 4) {
1170 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1171 "Trying to use READ CAPACITY(16).\n");
1175 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1176 "a kernel compiled with support for large "
1177 "block devices.\n");
1181 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1186 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1187 ((u64)buffer[1] << 48) |
1188 ((u64)buffer[2] << 40) |
1189 ((u64)buffer[3] << 32) |
1190 ((sector_t)buffer[4] << 24) |
1191 ((sector_t)buffer[5] << 16) |
1192 ((sector_t)buffer[6] << 8) |
1193 (sector_t)buffer[7]);
1195 sector_size = (buffer[8] << 24) |
1196 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1199 /* Some devices return the total number of sectors, not the
1200 * highest sector number. Make the necessary adjustment. */
1201 if (sdp->fix_capacity) {
1204 /* Some devices have version which report the correct sizes
1205 * and others which do not. We guess size according to a heuristic
1206 * and err on the side of lowering the capacity. */
1208 if (sdp->guess_capacity)
1209 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1214 if (sector_size == 0) {
1216 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1220 if (sector_size != 512 &&
1221 sector_size != 1024 &&
1222 sector_size != 2048 &&
1223 sector_size != 4096 &&
1224 sector_size != 256) {
1225 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1228 * The user might want to re-format the drive with
1229 * a supported sectorsize. Once this happens, it
1230 * would be relatively trivial to set the thing up.
1231 * For this reason, we leave the thing in the table.
1235 * set a bogus sector size so the normal read/write
1236 * logic in the block layer will eventually refuse any
1237 * request on this device without tripping over power
1238 * of two sector size assumptions
1244 * The msdos fs needs to know the hardware sector size
1245 * So I have created this table. See ll_rw_blk.c
1246 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1248 int hard_sector = sector_size;
1249 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1250 request_queue_t *queue = sdp->request_queue;
1253 blk_queue_hardsect_size(queue, hard_sector);
1254 /* avoid 64-bit division on 32-bit platforms */
1255 sector_div(sz, 625);
1257 sector_div(mb, 1950);
1259 sd_printk(KERN_NOTICE, sdkp,
1260 "%llu %d-byte hardware sectors (%llu MB)\n",
1261 (unsigned long long)sdkp->capacity,
1262 hard_sector, (unsigned long long)mb);
1265 /* Rescale capacity to 512-byte units */
1266 if (sector_size == 4096)
1267 sdkp->capacity <<= 3;
1268 else if (sector_size == 2048)
1269 sdkp->capacity <<= 2;
1270 else if (sector_size == 1024)
1271 sdkp->capacity <<= 1;
1272 else if (sector_size == 256)
1273 sdkp->capacity >>= 1;
1275 sdkp->device->sector_size = sector_size;
1278 /* called with buffer of length 512 */
1280 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1281 unsigned char *buffer, int len, struct scsi_mode_data *data,
1282 struct scsi_sense_hdr *sshdr)
1284 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1285 SD_TIMEOUT, SD_MAX_RETRIES, data,
1290 * read write protect setting, if possible - called only in sd_revalidate_disk()
1291 * called with buffer of length SD_BUF_SIZE
1294 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1297 struct scsi_device *sdp = sdkp->device;
1298 struct scsi_mode_data data;
1300 set_disk_ro(sdkp->disk, 0);
1301 if (sdp->skip_ms_page_3f) {
1302 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1306 if (sdp->use_192_bytes_for_3f) {
1307 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1310 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1311 * We have to start carefully: some devices hang if we ask
1312 * for more than is available.
1314 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1317 * Second attempt: ask for page 0 When only page 0 is
1318 * implemented, a request for page 3F may return Sense Key
1319 * 5: Illegal Request, Sense Code 24: Invalid field in
1322 if (!scsi_status_is_good(res))
1323 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1326 * Third attempt: ask 255 bytes, as we did earlier.
1328 if (!scsi_status_is_good(res))
1329 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1333 if (!scsi_status_is_good(res)) {
1334 sd_printk(KERN_WARNING, sdkp,
1335 "Test WP failed, assume Write Enabled\n");
1337 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1338 set_disk_ro(sdkp->disk, sdkp->write_prot);
1339 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1340 sdkp->write_prot ? "on" : "off");
1341 sd_printk(KERN_DEBUG, sdkp,
1342 "Mode Sense: %02x %02x %02x %02x\n",
1343 buffer[0], buffer[1], buffer[2], buffer[3]);
1348 * sd_read_cache_type - called only from sd_revalidate_disk()
1349 * called with buffer of length SD_BUF_SIZE
1352 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1355 struct scsi_device *sdp = sdkp->device;
1359 struct scsi_mode_data data;
1360 struct scsi_sense_hdr sshdr;
1362 if (sdp->skip_ms_page_8)
1365 if (sdp->type == TYPE_RBC) {
1373 /* cautiously ask */
1374 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1376 if (!scsi_status_is_good(res))
1379 if (!data.header_length) {
1381 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1384 /* that went OK, now ask for the proper length */
1388 * We're only interested in the first three bytes, actually.
1389 * But the data cache page is defined for the first 20.
1396 /* Take headers and block descriptors into account */
1397 len += data.header_length + data.block_descriptor_length;
1398 if (len > SD_BUF_SIZE)
1402 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1404 if (scsi_status_is_good(res)) {
1405 int offset = data.header_length + data.block_descriptor_length;
1407 if (offset >= SD_BUF_SIZE - 2) {
1408 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1412 if ((buffer[offset] & 0x3f) != modepage) {
1413 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1417 if (modepage == 8) {
1418 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1419 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1421 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1425 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1426 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1427 sd_printk(KERN_NOTICE, sdkp,
1428 "Uses READ/WRITE(6), disabling FUA\n");
1432 sd_printk(KERN_NOTICE, sdkp,
1433 "Write cache: %s, read cache: %s, %s\n",
1434 sdkp->WCE ? "enabled" : "disabled",
1435 sdkp->RCD ? "disabled" : "enabled",
1436 sdkp->DPOFUA ? "supports DPO and FUA"
1437 : "doesn't support DPO or FUA");
1443 if (scsi_sense_valid(&sshdr) &&
1444 sshdr.sense_key == ILLEGAL_REQUEST &&
1445 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1446 /* Invalid field in CDB */
1447 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1449 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1452 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1459 * sd_revalidate_disk - called the first time a new disk is seen,
1460 * performs disk spin up, read_capacity, etc.
1461 * @disk: struct gendisk we care about
1463 static int sd_revalidate_disk(struct gendisk *disk)
1465 struct scsi_disk *sdkp = scsi_disk(disk);
1466 struct scsi_device *sdp = sdkp->device;
1467 unsigned char *buffer;
1470 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name));
1473 * If the device is offline, don't try and read capacity or any
1474 * of the other niceties.
1476 if (!scsi_device_online(sdp))
1479 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
1481 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1482 "allocation failure.\n");
1486 /* defaults, until the device tells us otherwise */
1487 sdp->sector_size = 512;
1489 sdkp->media_present = 1;
1490 sdkp->write_prot = 0;
1494 sd_spinup_disk(sdkp);
1497 * Without media there is no reason to ask; moreover, some devices
1498 * react badly if we do.
1500 if (sdkp->media_present) {
1501 sd_read_capacity(sdkp, buffer);
1502 sd_read_write_protect_flag(sdkp, buffer);
1503 sd_read_cache_type(sdkp, buffer);
1507 * We now have all cache related info, determine how we deal
1508 * with ordered requests. Note that as the current SCSI
1509 * dispatch function can alter request order, we cannot use
1510 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1513 ordered = sdkp->DPOFUA
1514 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1516 ordered = QUEUE_ORDERED_DRAIN;
1518 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1520 set_capacity(disk, sdkp->capacity);
1528 * sd_probe - called during driver initialization and whenever a
1529 * new scsi device is attached to the system. It is called once
1530 * for each scsi device (not just disks) present.
1531 * @dev: pointer to device object
1533 * Returns 0 if successful (or not interested in this scsi device
1534 * (e.g. scanner)); 1 when there is an error.
1536 * Note: this function is invoked from the scsi mid-level.
1537 * This function sets up the mapping between a given
1538 * <host,channel,id,lun> (found in sdp) and new device name
1539 * (e.g. /dev/sda). More precisely it is the block device major
1540 * and minor number that is chosen here.
1542 * Assume sd_attach is not re-entrant (for time being)
1543 * Also think about sd_attach() and sd_remove() running coincidentally.
1545 static int sd_probe(struct device *dev)
1547 struct scsi_device *sdp = to_scsi_device(dev);
1548 struct scsi_disk *sdkp;
1554 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1557 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1561 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1565 gd = alloc_disk(16);
1569 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1572 spin_lock(&sd_index_lock);
1573 error = idr_get_new(&sd_index_idr, NULL, &index);
1574 spin_unlock(&sd_index_lock);
1576 if (index >= SD_MAX_DISKS)
1582 sdkp->driver = &sd_template;
1584 sdkp->index = index;
1587 if (!sdp->timeout) {
1588 if (sdp->type != TYPE_MOD)
1589 sdp->timeout = SD_TIMEOUT;
1591 sdp->timeout = SD_MOD_TIMEOUT;
1594 class_device_initialize(&sdkp->cdev);
1595 sdkp->cdev.dev = &sdp->sdev_gendev;
1596 sdkp->cdev.class = &sd_disk_class;
1597 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1599 if (class_device_add(&sdkp->cdev))
1602 get_device(&sdp->sdev_gendev);
1604 gd->major = sd_major((index & 0xf0) >> 4);
1605 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1607 gd->fops = &sd_fops;
1610 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1611 } else if (index < (26 + 1) * 26) {
1612 sprintf(gd->disk_name, "sd%c%c",
1613 'a' + index / 26 - 1,'a' + index % 26);
1615 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1616 const unsigned int m2 = (index / 26 - 1) % 26;
1617 const unsigned int m3 = index % 26;
1618 sprintf(gd->disk_name, "sd%c%c%c",
1619 'a' + m1, 'a' + m2, 'a' + m3);
1622 gd->private_data = &sdkp->driver;
1623 gd->queue = sdkp->device->request_queue;
1625 sd_revalidate_disk(gd);
1627 gd->driverfs_dev = &sdp->sdev_gendev;
1628 gd->flags = GENHD_FL_DRIVERFS;
1630 gd->flags |= GENHD_FL_REMOVABLE;
1632 dev_set_drvdata(dev, sdkp);
1635 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1636 sdp->removable ? "removable " : "");
1649 * sd_remove - called whenever a scsi disk (previously recognized by
1650 * sd_probe) is detached from the system. It is called (potentially
1651 * multiple times) during sd module unload.
1652 * @sdp: pointer to mid level scsi device object
1654 * Note: this function is invoked from the scsi mid-level.
1655 * This function potentially frees up a device name (e.g. /dev/sdc)
1656 * that could be re-used by a subsequent sd_probe().
1657 * This function is not called when the built-in sd driver is "exit-ed".
1659 static int sd_remove(struct device *dev)
1661 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1663 class_device_del(&sdkp->cdev);
1664 del_gendisk(sdkp->disk);
1667 mutex_lock(&sd_ref_mutex);
1668 dev_set_drvdata(dev, NULL);
1669 class_device_put(&sdkp->cdev);
1670 mutex_unlock(&sd_ref_mutex);
1676 * scsi_disk_release - Called to free the scsi_disk structure
1677 * @cdev: pointer to embedded class device
1679 * sd_ref_mutex must be held entering this routine. Because it is
1680 * called on last put, you should always use the scsi_disk_get()
1681 * scsi_disk_put() helpers which manipulate the semaphore directly
1682 * and never do a direct class_device_put().
1684 static void scsi_disk_release(struct class_device *cdev)
1686 struct scsi_disk *sdkp = to_scsi_disk(cdev);
1687 struct gendisk *disk = sdkp->disk;
1689 spin_lock(&sd_index_lock);
1690 idr_remove(&sd_index_idr, sdkp->index);
1691 spin_unlock(&sd_index_lock);
1693 disk->private_data = NULL;
1695 put_device(&sdkp->device->sdev_gendev);
1701 * Send a SYNCHRONIZE CACHE instruction down to the device through
1702 * the normal SCSI command structure. Wait for the command to
1705 static void sd_shutdown(struct device *dev)
1707 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1710 return; /* this can happen */
1713 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1714 sd_sync_cache(sdkp);
1716 scsi_disk_put(sdkp);
1720 * init_sd - entry point for this driver (both when built in or when
1723 * Note: this function registers this driver with the scsi mid-level.
1725 static int __init init_sd(void)
1727 int majors = 0, i, err;
1729 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1731 for (i = 0; i < SD_MAJORS; i++)
1732 if (register_blkdev(sd_major(i), "sd") == 0)
1738 err = class_register(&sd_disk_class);
1742 err = scsi_register_driver(&sd_template.gendrv);
1749 class_unregister(&sd_disk_class);
1751 for (i = 0; i < SD_MAJORS; i++)
1752 unregister_blkdev(sd_major(i), "sd");
1757 * exit_sd - exit point for this driver (when it is a module).
1759 * Note: this function unregisters this driver from the scsi mid-level.
1761 static void __exit exit_sd(void)
1765 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1767 scsi_unregister_driver(&sd_template.gendrv);
1768 class_unregister(&sd_disk_class);
1770 for (i = 0; i < SD_MAJORS; i++)
1771 unregister_blkdev(sd_major(i), "sd");
1774 module_init(init_sd);
1775 module_exit(exit_sd);
1777 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1778 struct scsi_sense_hdr *sshdr)
1780 sd_printk(KERN_INFO, sdkp, "");
1781 scsi_show_sense_hdr(sshdr);
1782 sd_printk(KERN_INFO, sdkp, "");
1783 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1786 static void sd_print_result(struct scsi_disk *sdkp, int result)
1788 sd_printk(KERN_INFO, sdkp, "");
1789 scsi_show_result(result);