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);
85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
89 static DEFINE_IDR(sd_index_idr);
90 static DEFINE_SPINLOCK(sd_index_lock);
92 /* This semaphore is used to mediate the 0->1 reference get in the
93 * face of object destruction (i.e. we can't allow a get on an
94 * object after last put) */
95 static DEFINE_MUTEX(sd_ref_mutex);
97 static const char *sd_cache_types[] = {
98 "write through", "none", "write back",
99 "write back, no read (daft)"
102 static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
105 int i, ct = -1, rcd, wce, sp;
106 struct scsi_disk *sdkp = to_scsi_disk(cdev);
107 struct scsi_device *sdp = sdkp->device;
110 struct scsi_mode_data data;
111 struct scsi_sense_hdr sshdr;
114 if (sdp->type != TYPE_DISK)
115 /* no cache control on RBC devices; theoretically they
116 * can do it, but there's probably so many exceptions
117 * it's not worth the risk */
120 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
121 const int len = strlen(sd_cache_types[i]);
122 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
130 rcd = ct & 0x01 ? 1 : 0;
131 wce = ct & 0x02 ? 1 : 0;
132 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
133 SD_MAX_RETRIES, &data, NULL))
135 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
136 data.block_descriptor_length);
137 buffer_data = buffer + data.header_length +
138 data.block_descriptor_length;
139 buffer_data[2] &= ~0x05;
140 buffer_data[2] |= wce << 2 | rcd;
141 sp = buffer_data[0] & 0x80 ? 1 : 0;
143 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
144 SD_MAX_RETRIES, &data, &sshdr)) {
145 if (scsi_sense_valid(&sshdr))
146 sd_print_sense_hdr(sdkp, &sshdr);
149 sd_revalidate_disk(sdkp->disk);
153 static ssize_t sd_store_manage_start_stop(struct class_device *cdev,
154 const char *buf, size_t count)
156 struct scsi_disk *sdkp = to_scsi_disk(cdev);
157 struct scsi_device *sdp = sdkp->device;
159 if (!capable(CAP_SYS_ADMIN))
162 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
167 static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
170 struct scsi_disk *sdkp = to_scsi_disk(cdev);
171 struct scsi_device *sdp = sdkp->device;
173 if (!capable(CAP_SYS_ADMIN))
176 if (sdp->type != TYPE_DISK)
179 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
184 static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
186 struct scsi_disk *sdkp = to_scsi_disk(cdev);
187 int ct = sdkp->RCD + 2*sdkp->WCE;
189 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
192 static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
194 struct scsi_disk *sdkp = to_scsi_disk(cdev);
196 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
199 static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf)
201 struct scsi_disk *sdkp = to_scsi_disk(cdev);
202 struct scsi_device *sdp = sdkp->device;
204 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
207 static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
209 struct scsi_disk *sdkp = to_scsi_disk(cdev);
211 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
214 static struct class_device_attribute sd_disk_attrs[] = {
215 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
216 sd_store_cache_type),
217 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
218 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
219 sd_store_allow_restart),
220 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
221 sd_store_manage_start_stop),
225 static struct class sd_disk_class = {
227 .owner = THIS_MODULE,
228 .release = scsi_disk_release,
229 .class_dev_attrs = sd_disk_attrs,
232 static struct scsi_driver sd_template = {
233 .owner = THIS_MODULE,
238 .suspend = sd_suspend,
240 .shutdown = sd_shutdown,
243 .init_command = sd_init_command,
244 .issue_flush = sd_issue_flush,
248 * Device no to disk mapping:
250 * major disc2 disc p1
251 * |............|.............|....|....| <- dev_t
254 * Inside a major, we have 16k disks, however mapped non-
255 * contiguously. The first 16 disks are for major0, the next
256 * ones with major1, ... Disk 256 is for major0 again, disk 272
258 * As we stay compatible with our numbering scheme, we can reuse
259 * the well-know SCSI majors 8, 65--71, 136--143.
261 static int sd_major(int major_idx)
265 return SCSI_DISK0_MAJOR;
267 return SCSI_DISK1_MAJOR + major_idx - 1;
269 return SCSI_DISK8_MAJOR + major_idx - 8;
272 return 0; /* shut up gcc */
276 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
278 return container_of(disk->private_data, struct scsi_disk, driver);
281 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
283 struct scsi_disk *sdkp = NULL;
285 if (disk->private_data) {
286 sdkp = scsi_disk(disk);
287 if (scsi_device_get(sdkp->device) == 0)
288 class_device_get(&sdkp->cdev);
295 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
297 struct scsi_disk *sdkp;
299 mutex_lock(&sd_ref_mutex);
300 sdkp = __scsi_disk_get(disk);
301 mutex_unlock(&sd_ref_mutex);
305 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
307 struct scsi_disk *sdkp;
309 mutex_lock(&sd_ref_mutex);
310 sdkp = dev_get_drvdata(dev);
312 sdkp = __scsi_disk_get(sdkp->disk);
313 mutex_unlock(&sd_ref_mutex);
317 static void scsi_disk_put(struct scsi_disk *sdkp)
319 struct scsi_device *sdev = sdkp->device;
321 mutex_lock(&sd_ref_mutex);
322 class_device_put(&sdkp->cdev);
323 scsi_device_put(sdev);
324 mutex_unlock(&sd_ref_mutex);
328 * sd_init_command - build a scsi (read or write) command from
329 * information in the request structure.
330 * @SCpnt: pointer to mid-level's per scsi command structure that
331 * contains request and into which the scsi command is written
333 * Returns 1 if successful and 0 if error (or cannot be done now).
335 static int sd_init_command(struct scsi_cmnd * SCpnt)
337 struct scsi_device *sdp = SCpnt->device;
338 struct request *rq = SCpnt->request;
339 struct gendisk *disk = rq->rq_disk;
340 sector_t block = rq->sector;
341 unsigned int this_count = SCpnt->request_bufflen >> 9;
342 unsigned int timeout = sdp->timeout;
344 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
345 "sd_init_command: block=%llu, "
347 (unsigned long long)block,
350 if (!sdp || !scsi_device_online(sdp) ||
351 block + rq->nr_sectors > get_capacity(disk)) {
352 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
353 "Finishing %ld sectors\n",
355 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
356 "Retry with 0x%p\n", SCpnt));
362 * quietly refuse to do anything to a changed disc until
363 * the changed bit has been reset
365 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
368 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
369 (unsigned long long)block));
372 * If we have a 1K hardware sectorsize, prevent access to single
373 * 512 byte sectors. In theory we could handle this - in fact
374 * the scsi cdrom driver must be able to handle this because
375 * we typically use 1K blocksizes, and cdroms typically have
376 * 2K hardware sectorsizes. Of course, things are simpler
377 * with the cdrom, since it is read-only. For performance
378 * reasons, the filesystems should be able to handle this
379 * and not force the scsi disk driver to use bounce buffers
382 if (sdp->sector_size == 1024) {
383 if ((block & 1) || (rq->nr_sectors & 1)) {
384 scmd_printk(KERN_ERR, SCpnt,
385 "Bad block number requested\n");
389 this_count = this_count >> 1;
392 if (sdp->sector_size == 2048) {
393 if ((block & 3) || (rq->nr_sectors & 3)) {
394 scmd_printk(KERN_ERR, SCpnt,
395 "Bad block number requested\n");
399 this_count = this_count >> 2;
402 if (sdp->sector_size == 4096) {
403 if ((block & 7) || (rq->nr_sectors & 7)) {
404 scmd_printk(KERN_ERR, SCpnt,
405 "Bad block number requested\n");
409 this_count = this_count >> 3;
412 if (rq_data_dir(rq) == WRITE) {
413 if (!sdp->writeable) {
416 SCpnt->cmnd[0] = WRITE_6;
417 SCpnt->sc_data_direction = DMA_TO_DEVICE;
418 } else if (rq_data_dir(rq) == READ) {
419 SCpnt->cmnd[0] = READ_6;
420 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
422 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
426 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
427 "%s %d/%ld 512 byte blocks.\n",
428 (rq_data_dir(rq) == WRITE) ?
429 "writing" : "reading", this_count,
434 if (block > 0xffffffff) {
435 SCpnt->cmnd[0] += READ_16 - READ_6;
436 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
437 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
438 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
439 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
440 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
441 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
442 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
443 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
444 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
445 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
446 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
447 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
448 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
449 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
450 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
451 SCpnt->device->use_10_for_rw) {
452 if (this_count > 0xffff)
455 SCpnt->cmnd[0] += READ_10 - READ_6;
456 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
457 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
458 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
459 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
460 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
461 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
462 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
463 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
465 if (unlikely(blk_fua_rq(rq))) {
467 * This happens only if this drive failed
468 * 10byte rw command with ILLEGAL_REQUEST
469 * during operation and thus turned off
472 scmd_printk(KERN_ERR, SCpnt,
473 "FUA write on READ/WRITE(6) drive\n");
477 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
478 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
479 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
480 SCpnt->cmnd[4] = (unsigned char) this_count;
483 SCpnt->request_bufflen = this_count * sdp->sector_size;
486 * We shouldn't disconnect in the middle of a sector, so with a dumb
487 * host adapter, it's safe to assume that we can at least transfer
488 * this many bytes between each connect / disconnect.
490 SCpnt->transfersize = sdp->sector_size;
491 SCpnt->underflow = this_count << 9;
492 SCpnt->allowed = SD_MAX_RETRIES;
493 SCpnt->timeout_per_command = timeout;
496 * This is the completion routine we use. This is matched in terms
497 * of capability to this function.
499 SCpnt->done = sd_rw_intr;
502 * This indicates that the command is ready from our end to be
509 * sd_open - open a scsi disk device
510 * @inode: only i_rdev member may be used
511 * @filp: only f_mode and f_flags may be used
513 * Returns 0 if successful. Returns a negated errno value in case
516 * Note: This can be called from a user context (e.g. fsck(1) )
517 * or from within the kernel (e.g. as a result of a mount(1) ).
518 * In the latter case @inode and @filp carry an abridged amount
519 * of information as noted above.
521 static int sd_open(struct inode *inode, struct file *filp)
523 struct gendisk *disk = inode->i_bdev->bd_disk;
524 struct scsi_disk *sdkp;
525 struct scsi_device *sdev;
528 if (!(sdkp = scsi_disk_get(disk)))
532 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
537 * If the device is in error recovery, wait until it is done.
538 * If the device is offline, then disallow any access to it.
541 if (!scsi_block_when_processing_errors(sdev))
544 if (sdev->removable || sdkp->write_prot)
545 check_disk_change(inode->i_bdev);
548 * If the drive is empty, just let the open fail.
551 if (sdev->removable && !sdkp->media_present &&
552 !(filp->f_flags & O_NDELAY))
556 * If the device has the write protect tab set, have the open fail
557 * if the user expects to be able to write to the thing.
560 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
564 * It is possible that the disk changing stuff resulted in
565 * the device being taken offline. If this is the case,
566 * report this to the user, and don't pretend that the
567 * open actually succeeded.
570 if (!scsi_device_online(sdev))
573 if (!sdkp->openers++ && sdev->removable) {
574 if (scsi_block_when_processing_errors(sdev))
575 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
586 * sd_release - invoked when the (last) close(2) is called on this
588 * @inode: only i_rdev member may be used
589 * @filp: only f_mode and f_flags may be used
593 * Note: may block (uninterruptible) if error recovery is underway
596 static int sd_release(struct inode *inode, struct file *filp)
598 struct gendisk *disk = inode->i_bdev->bd_disk;
599 struct scsi_disk *sdkp = scsi_disk(disk);
600 struct scsi_device *sdev = sdkp->device;
602 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
604 if (!--sdkp->openers && sdev->removable) {
605 if (scsi_block_when_processing_errors(sdev))
606 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
610 * XXX and what if there are packets in flight and this close()
611 * XXX is followed by a "rmmod sd_mod"?
617 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
619 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
620 struct scsi_device *sdp = sdkp->device;
621 struct Scsi_Host *host = sdp->host;
624 /* default to most commonly used values */
625 diskinfo[0] = 0x40; /* 1 << 6 */
626 diskinfo[1] = 0x20; /* 1 << 5 */
627 diskinfo[2] = sdkp->capacity >> 11;
629 /* override with calculated, extended default, or driver values */
630 if (host->hostt->bios_param)
631 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
633 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
635 geo->heads = diskinfo[0];
636 geo->sectors = diskinfo[1];
637 geo->cylinders = diskinfo[2];
642 * sd_ioctl - process an ioctl
643 * @inode: only i_rdev/i_bdev members may be used
644 * @filp: only f_mode and f_flags may be used
645 * @cmd: ioctl command number
646 * @arg: this is third argument given to ioctl(2) system call.
647 * Often contains a pointer.
649 * Returns 0 if successful (some ioctls return postive numbers on
650 * success as well). Returns a negated errno value in case of error.
652 * Note: most ioctls are forward onto the block subsystem or further
653 * down in the scsi subsytem.
655 static int sd_ioctl(struct inode * inode, struct file * filp,
656 unsigned int cmd, unsigned long arg)
658 struct block_device *bdev = inode->i_bdev;
659 struct gendisk *disk = bdev->bd_disk;
660 struct scsi_device *sdp = scsi_disk(disk)->device;
661 void __user *p = (void __user *)arg;
664 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
665 disk->disk_name, cmd));
668 * If we are in the middle of error recovery, don't let anyone
669 * else try and use this device. Also, if error recovery fails, it
670 * may try and take the device offline, in which case all further
671 * access to the device is prohibited.
673 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
674 if (!scsi_block_when_processing_errors(sdp) || !error)
678 * Send SCSI addressing ioctls directly to mid level, send other
679 * ioctls to block level and then onto mid level if they can't be
683 case SCSI_IOCTL_GET_IDLUN:
684 case SCSI_IOCTL_GET_BUS_NUMBER:
685 return scsi_ioctl(sdp, cmd, p);
687 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
688 if (error != -ENOTTY)
691 return scsi_ioctl(sdp, cmd, p);
694 static void set_media_not_present(struct scsi_disk *sdkp)
696 sdkp->media_present = 0;
698 sdkp->device->changed = 1;
702 * sd_media_changed - check if our medium changed
703 * @disk: kernel device descriptor
705 * Returns 0 if not applicable or no change; 1 if change
707 * Note: this function is invoked from the block subsystem.
709 static int sd_media_changed(struct gendisk *disk)
711 struct scsi_disk *sdkp = scsi_disk(disk);
712 struct scsi_device *sdp = sdkp->device;
715 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
721 * If the device is offline, don't send any commands - just pretend as
722 * if the command failed. If the device ever comes back online, we
723 * can deal with it then. It is only because of unrecoverable errors
724 * that we would ever take a device offline in the first place.
726 if (!scsi_device_online(sdp))
730 * Using TEST_UNIT_READY enables differentiation between drive with
731 * no cartridge loaded - NOT READY, drive with changed cartridge -
732 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
734 * Drives that auto spin down. eg iomega jaz 1G, will be started
735 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
736 * sd_revalidate() is called.
739 if (scsi_block_when_processing_errors(sdp))
740 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
743 * Unable to test, unit probably not ready. This usually
744 * means there is no disc in the drive. Mark as changed,
745 * and we will figure it out later once the drive is
752 * For removable scsi disk we have to recognise the presence
753 * of a disk in the drive. This is kept in the struct scsi_disk
754 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
756 sdkp->media_present = 1;
758 retval = sdp->changed;
764 set_media_not_present(sdkp);
768 static int sd_sync_cache(struct scsi_disk *sdkp)
771 struct scsi_device *sdp = sdkp->device;
772 struct scsi_sense_hdr sshdr;
774 if (!scsi_device_online(sdp))
778 for (retries = 3; retries > 0; --retries) {
779 unsigned char cmd[10] = { 0 };
781 cmd[0] = SYNCHRONIZE_CACHE;
783 * Leave the rest of the command zero to indicate
786 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
787 SD_TIMEOUT, SD_MAX_RETRIES);
793 sd_print_result(sdkp, res);
794 if (driver_byte(res) & DRIVER_SENSE)
795 sd_print_sense_hdr(sdkp, &sshdr);
803 static int sd_issue_flush(struct device *dev, sector_t *error_sector)
806 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
812 ret = sd_sync_cache(sdkp);
817 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
819 memset(rq->cmd, 0, sizeof(rq->cmd));
820 rq->cmd_type = REQ_TYPE_BLOCK_PC;
821 rq->timeout = SD_TIMEOUT;
822 rq->cmd[0] = SYNCHRONIZE_CACHE;
826 static void sd_rescan(struct device *dev)
828 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
831 sd_revalidate_disk(sdkp->disk);
839 * This gets directly called from VFS. When the ioctl
840 * is not recognized we go back to the other translation paths.
842 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
844 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
845 struct gendisk *disk = bdev->bd_disk;
846 struct scsi_device *sdev = scsi_disk(disk)->device;
849 * If we are in the middle of error recovery, don't let anyone
850 * else try and use this device. Also, if error recovery fails, it
851 * may try and take the device offline, in which case all further
852 * access to the device is prohibited.
854 if (!scsi_block_when_processing_errors(sdev))
857 if (sdev->host->hostt->compat_ioctl) {
860 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
866 * Let the static ioctl translation table take care of it.
872 static struct block_device_operations sd_fops = {
873 .owner = THIS_MODULE,
875 .release = sd_release,
879 .compat_ioctl = sd_compat_ioctl,
881 .media_changed = sd_media_changed,
882 .revalidate_disk = sd_revalidate_disk,
886 * sd_rw_intr - bottom half handler: called when the lower level
887 * driver has completed (successfully or otherwise) a scsi command.
888 * @SCpnt: mid-level's per command structure.
890 * Note: potentially run from within an ISR. Must not block.
892 static void sd_rw_intr(struct scsi_cmnd * SCpnt)
894 int result = SCpnt->result;
895 unsigned int xfer_size = SCpnt->request_bufflen;
896 unsigned int good_bytes = result ? 0 : xfer_size;
897 u64 start_lba = SCpnt->request->sector;
899 struct scsi_sense_hdr sshdr;
901 int sense_deferred = 0;
905 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
907 sense_deferred = scsi_sense_is_deferred(&sshdr);
909 #ifdef CONFIG_SCSI_LOGGING
910 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
912 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
913 "sd_rw_intr: sb[respc,sk,asc,"
914 "ascq]=%x,%x,%x,%x\n",
916 sshdr.sense_key, sshdr.asc,
920 if (driver_byte(result) != DRIVER_SENSE &&
921 (!sense_valid || sense_deferred))
924 switch (sshdr.sense_key) {
927 if (!blk_fs_request(SCpnt->request))
929 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
930 SCSI_SENSE_BUFFERSIZE,
934 if (xfer_size <= SCpnt->device->sector_size)
936 switch (SCpnt->device->sector_size) {
952 /* Print something here with limiting frequency. */
956 /* This computation should always be done in terms of
957 * the resolution of the device's medium.
959 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
961 case RECOVERED_ERROR:
963 /* Inform the user, but make sure that it's not treated
966 scsi_print_sense("sd", SCpnt);
968 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
969 good_bytes = xfer_size;
971 case ILLEGAL_REQUEST:
972 if (SCpnt->device->use_10_for_rw &&
973 (SCpnt->cmnd[0] == READ_10 ||
974 SCpnt->cmnd[0] == WRITE_10))
975 SCpnt->device->use_10_for_rw = 0;
976 if (SCpnt->device->use_10_for_ms &&
977 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
978 SCpnt->cmnd[0] == MODE_SELECT_10))
979 SCpnt->device->use_10_for_ms = 0;
985 scsi_io_completion(SCpnt, good_bytes);
988 static int media_not_present(struct scsi_disk *sdkp,
989 struct scsi_sense_hdr *sshdr)
992 if (!scsi_sense_valid(sshdr))
994 /* not invoked for commands that could return deferred errors */
995 if (sshdr->sense_key != NOT_READY &&
996 sshdr->sense_key != UNIT_ATTENTION)
998 if (sshdr->asc != 0x3A) /* medium not present */
1001 set_media_not_present(sdkp);
1006 * spinup disk - called only in sd_revalidate_disk()
1009 sd_spinup_disk(struct scsi_disk *sdkp)
1011 unsigned char cmd[10];
1012 unsigned long spintime_expire = 0;
1013 int retries, spintime;
1014 unsigned int the_result;
1015 struct scsi_sense_hdr sshdr;
1016 int sense_valid = 0;
1020 /* Spin up drives, as required. Only do this at boot time */
1021 /* Spinup needs to be done for module loads too. */
1026 cmd[0] = TEST_UNIT_READY;
1027 memset((void *) &cmd[1], 0, 9);
1029 the_result = scsi_execute_req(sdkp->device, cmd,
1035 * If the drive has indicated to us that it
1036 * doesn't have any media in it, don't bother
1037 * with any more polling.
1039 if (media_not_present(sdkp, &sshdr))
1043 sense_valid = scsi_sense_valid(&sshdr);
1045 } while (retries < 3 &&
1046 (!scsi_status_is_good(the_result) ||
1047 ((driver_byte(the_result) & DRIVER_SENSE) &&
1048 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1050 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1051 /* no sense, TUR either succeeded or failed
1052 * with a status error */
1053 if(!spintime && !scsi_status_is_good(the_result)) {
1054 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1055 sd_print_result(sdkp, the_result);
1061 * The device does not want the automatic start to be issued.
1063 if (sdkp->device->no_start_on_add) {
1068 * If manual intervention is required, or this is an
1069 * absent USB storage device, a spinup is meaningless.
1072 sshdr.sense_key == NOT_READY &&
1073 sshdr.asc == 4 && sshdr.ascq == 3) {
1074 break; /* manual intervention required */
1077 * Issue command to spin up drive when not ready
1079 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1081 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1082 cmd[0] = START_STOP;
1083 cmd[1] = 1; /* Return immediately */
1084 memset((void *) &cmd[2], 0, 8);
1085 cmd[4] = 1; /* Start spin cycle */
1086 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1088 SD_TIMEOUT, SD_MAX_RETRIES);
1089 spintime_expire = jiffies + 100 * HZ;
1092 /* Wait 1 second for next try */
1097 * Wait for USB flash devices with slow firmware.
1098 * Yes, this sense key/ASC combination shouldn't
1099 * occur here. It's characteristic of these devices.
1101 } else if (sense_valid &&
1102 sshdr.sense_key == UNIT_ATTENTION &&
1103 sshdr.asc == 0x28) {
1105 spintime_expire = jiffies + 5 * HZ;
1108 /* Wait 1 second for next try */
1111 /* we don't understand the sense code, so it's
1112 * probably pointless to loop */
1114 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1115 sd_print_sense_hdr(sdkp, &sshdr);
1120 } while (spintime && time_before_eq(jiffies, spintime_expire));
1123 if (scsi_status_is_good(the_result))
1126 printk("not responding...\n");
1131 * read disk capacity
1134 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1136 unsigned char cmd[16];
1137 int the_result, retries;
1138 int sector_size = 0;
1140 struct scsi_sense_hdr sshdr;
1141 int sense_valid = 0;
1142 struct scsi_device *sdp = sdkp->device;
1148 memset((void *) cmd, 0, 16);
1149 cmd[0] = SERVICE_ACTION_IN;
1150 cmd[1] = SAI_READ_CAPACITY_16;
1152 memset((void *) buffer, 0, 12);
1154 cmd[0] = READ_CAPACITY;
1155 memset((void *) &cmd[1], 0, 9);
1156 memset((void *) buffer, 0, 8);
1159 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1160 buffer, longrc ? 12 : 8, &sshdr,
1161 SD_TIMEOUT, SD_MAX_RETRIES);
1163 if (media_not_present(sdkp, &sshdr))
1167 sense_valid = scsi_sense_valid(&sshdr);
1170 } while (the_result && retries);
1172 if (the_result && !longrc) {
1173 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1174 sd_print_result(sdkp, the_result);
1175 if (driver_byte(the_result) & DRIVER_SENSE)
1176 sd_print_sense_hdr(sdkp, &sshdr);
1178 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1180 /* Set dirty bit for removable devices if not ready -
1181 * sometimes drives will not report this properly. */
1182 if (sdp->removable &&
1183 sense_valid && sshdr.sense_key == NOT_READY)
1186 /* Either no media are present but the drive didn't tell us,
1187 or they are present but the read capacity command fails */
1188 /* sdkp->media_present = 0; -- not always correct */
1189 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1192 } else if (the_result && longrc) {
1193 /* READ CAPACITY(16) has been failed */
1194 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1195 sd_print_result(sdkp, the_result);
1196 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1198 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1203 sector_size = (buffer[4] << 24) |
1204 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1205 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1206 buffer[2] == 0xff && buffer[3] == 0xff) {
1207 if(sizeof(sdkp->capacity) > 4) {
1208 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1209 "Trying to use READ CAPACITY(16).\n");
1213 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1214 "a kernel compiled with support for large "
1215 "block devices.\n");
1219 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1224 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1225 ((u64)buffer[1] << 48) |
1226 ((u64)buffer[2] << 40) |
1227 ((u64)buffer[3] << 32) |
1228 ((sector_t)buffer[4] << 24) |
1229 ((sector_t)buffer[5] << 16) |
1230 ((sector_t)buffer[6] << 8) |
1231 (sector_t)buffer[7]);
1233 sector_size = (buffer[8] << 24) |
1234 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1237 /* Some devices return the total number of sectors, not the
1238 * highest sector number. Make the necessary adjustment. */
1239 if (sdp->fix_capacity) {
1242 /* Some devices have version which report the correct sizes
1243 * and others which do not. We guess size according to a heuristic
1244 * and err on the side of lowering the capacity. */
1246 if (sdp->guess_capacity)
1247 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1252 if (sector_size == 0) {
1254 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1258 if (sector_size != 512 &&
1259 sector_size != 1024 &&
1260 sector_size != 2048 &&
1261 sector_size != 4096 &&
1262 sector_size != 256) {
1263 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1266 * The user might want to re-format the drive with
1267 * a supported sectorsize. Once this happens, it
1268 * would be relatively trivial to set the thing up.
1269 * For this reason, we leave the thing in the table.
1273 * set a bogus sector size so the normal read/write
1274 * logic in the block layer will eventually refuse any
1275 * request on this device without tripping over power
1276 * of two sector size assumptions
1282 * The msdos fs needs to know the hardware sector size
1283 * So I have created this table. See ll_rw_blk.c
1284 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1286 int hard_sector = sector_size;
1287 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1288 struct request_queue *queue = sdp->request_queue;
1291 blk_queue_hardsect_size(queue, hard_sector);
1292 /* avoid 64-bit division on 32-bit platforms */
1293 sector_div(sz, 625);
1295 sector_div(mb, 1950);
1297 sd_printk(KERN_NOTICE, sdkp,
1298 "%llu %d-byte hardware sectors (%llu MB)\n",
1299 (unsigned long long)sdkp->capacity,
1300 hard_sector, (unsigned long long)mb);
1303 /* Rescale capacity to 512-byte units */
1304 if (sector_size == 4096)
1305 sdkp->capacity <<= 3;
1306 else if (sector_size == 2048)
1307 sdkp->capacity <<= 2;
1308 else if (sector_size == 1024)
1309 sdkp->capacity <<= 1;
1310 else if (sector_size == 256)
1311 sdkp->capacity >>= 1;
1313 sdkp->device->sector_size = sector_size;
1316 /* called with buffer of length 512 */
1318 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1319 unsigned char *buffer, int len, struct scsi_mode_data *data,
1320 struct scsi_sense_hdr *sshdr)
1322 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1323 SD_TIMEOUT, SD_MAX_RETRIES, data,
1328 * read write protect setting, if possible - called only in sd_revalidate_disk()
1329 * called with buffer of length SD_BUF_SIZE
1332 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1335 struct scsi_device *sdp = sdkp->device;
1336 struct scsi_mode_data data;
1338 set_disk_ro(sdkp->disk, 0);
1339 if (sdp->skip_ms_page_3f) {
1340 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1344 if (sdp->use_192_bytes_for_3f) {
1345 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1348 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1349 * We have to start carefully: some devices hang if we ask
1350 * for more than is available.
1352 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1355 * Second attempt: ask for page 0 When only page 0 is
1356 * implemented, a request for page 3F may return Sense Key
1357 * 5: Illegal Request, Sense Code 24: Invalid field in
1360 if (!scsi_status_is_good(res))
1361 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1364 * Third attempt: ask 255 bytes, as we did earlier.
1366 if (!scsi_status_is_good(res))
1367 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1371 if (!scsi_status_is_good(res)) {
1372 sd_printk(KERN_WARNING, sdkp,
1373 "Test WP failed, assume Write Enabled\n");
1375 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1376 set_disk_ro(sdkp->disk, sdkp->write_prot);
1377 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1378 sdkp->write_prot ? "on" : "off");
1379 sd_printk(KERN_DEBUG, sdkp,
1380 "Mode Sense: %02x %02x %02x %02x\n",
1381 buffer[0], buffer[1], buffer[2], buffer[3]);
1386 * sd_read_cache_type - called only from sd_revalidate_disk()
1387 * called with buffer of length SD_BUF_SIZE
1390 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1393 struct scsi_device *sdp = sdkp->device;
1397 struct scsi_mode_data data;
1398 struct scsi_sense_hdr sshdr;
1400 if (sdp->skip_ms_page_8)
1403 if (sdp->type == TYPE_RBC) {
1411 /* cautiously ask */
1412 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1414 if (!scsi_status_is_good(res))
1417 if (!data.header_length) {
1419 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1422 /* that went OK, now ask for the proper length */
1426 * We're only interested in the first three bytes, actually.
1427 * But the data cache page is defined for the first 20.
1434 /* Take headers and block descriptors into account */
1435 len += data.header_length + data.block_descriptor_length;
1436 if (len > SD_BUF_SIZE)
1440 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1442 if (scsi_status_is_good(res)) {
1443 int offset = data.header_length + data.block_descriptor_length;
1445 if (offset >= SD_BUF_SIZE - 2) {
1446 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1450 if ((buffer[offset] & 0x3f) != modepage) {
1451 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1455 if (modepage == 8) {
1456 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1457 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1459 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1463 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1464 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1465 sd_printk(KERN_NOTICE, sdkp,
1466 "Uses READ/WRITE(6), disabling FUA\n");
1470 sd_printk(KERN_NOTICE, sdkp,
1471 "Write cache: %s, read cache: %s, %s\n",
1472 sdkp->WCE ? "enabled" : "disabled",
1473 sdkp->RCD ? "disabled" : "enabled",
1474 sdkp->DPOFUA ? "supports DPO and FUA"
1475 : "doesn't support DPO or FUA");
1481 if (scsi_sense_valid(&sshdr) &&
1482 sshdr.sense_key == ILLEGAL_REQUEST &&
1483 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1484 /* Invalid field in CDB */
1485 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1487 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1490 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1497 * sd_revalidate_disk - called the first time a new disk is seen,
1498 * performs disk spin up, read_capacity, etc.
1499 * @disk: struct gendisk we care about
1501 static int sd_revalidate_disk(struct gendisk *disk)
1503 struct scsi_disk *sdkp = scsi_disk(disk);
1504 struct scsi_device *sdp = sdkp->device;
1505 unsigned char *buffer;
1508 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1509 "sd_revalidate_disk\n"));
1512 * If the device is offline, don't try and read capacity or any
1513 * of the other niceties.
1515 if (!scsi_device_online(sdp))
1518 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1520 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1521 "allocation failure.\n");
1525 /* defaults, until the device tells us otherwise */
1526 sdp->sector_size = 512;
1528 sdkp->media_present = 1;
1529 sdkp->write_prot = 0;
1533 sd_spinup_disk(sdkp);
1536 * Without media there is no reason to ask; moreover, some devices
1537 * react badly if we do.
1539 if (sdkp->media_present) {
1540 sd_read_capacity(sdkp, buffer);
1541 sd_read_write_protect_flag(sdkp, buffer);
1542 sd_read_cache_type(sdkp, buffer);
1546 * We now have all cache related info, determine how we deal
1547 * with ordered requests. Note that as the current SCSI
1548 * dispatch function can alter request order, we cannot use
1549 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1552 ordered = sdkp->DPOFUA
1553 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1555 ordered = QUEUE_ORDERED_DRAIN;
1557 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1559 set_capacity(disk, sdkp->capacity);
1567 * sd_probe - called during driver initialization and whenever a
1568 * new scsi device is attached to the system. It is called once
1569 * for each scsi device (not just disks) present.
1570 * @dev: pointer to device object
1572 * Returns 0 if successful (or not interested in this scsi device
1573 * (e.g. scanner)); 1 when there is an error.
1575 * Note: this function is invoked from the scsi mid-level.
1576 * This function sets up the mapping between a given
1577 * <host,channel,id,lun> (found in sdp) and new device name
1578 * (e.g. /dev/sda). More precisely it is the block device major
1579 * and minor number that is chosen here.
1581 * Assume sd_attach is not re-entrant (for time being)
1582 * Also think about sd_attach() and sd_remove() running coincidentally.
1584 static int sd_probe(struct device *dev)
1586 struct scsi_device *sdp = to_scsi_device(dev);
1587 struct scsi_disk *sdkp;
1593 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1596 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1600 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1604 gd = alloc_disk(16);
1608 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1611 spin_lock(&sd_index_lock);
1612 error = idr_get_new(&sd_index_idr, NULL, &index);
1613 spin_unlock(&sd_index_lock);
1615 if (index >= SD_MAX_DISKS)
1621 sdkp->driver = &sd_template;
1623 sdkp->index = index;
1626 if (!sdp->timeout) {
1627 if (sdp->type != TYPE_MOD)
1628 sdp->timeout = SD_TIMEOUT;
1630 sdp->timeout = SD_MOD_TIMEOUT;
1633 class_device_initialize(&sdkp->cdev);
1634 sdkp->cdev.dev = &sdp->sdev_gendev;
1635 sdkp->cdev.class = &sd_disk_class;
1636 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1638 if (class_device_add(&sdkp->cdev))
1641 get_device(&sdp->sdev_gendev);
1643 gd->major = sd_major((index & 0xf0) >> 4);
1644 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1646 gd->fops = &sd_fops;
1649 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1650 } else if (index < (26 + 1) * 26) {
1651 sprintf(gd->disk_name, "sd%c%c",
1652 'a' + index / 26 - 1,'a' + index % 26);
1654 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1655 const unsigned int m2 = (index / 26 - 1) % 26;
1656 const unsigned int m3 = index % 26;
1657 sprintf(gd->disk_name, "sd%c%c%c",
1658 'a' + m1, 'a' + m2, 'a' + m3);
1661 gd->private_data = &sdkp->driver;
1662 gd->queue = sdkp->device->request_queue;
1664 sd_revalidate_disk(gd);
1666 gd->driverfs_dev = &sdp->sdev_gendev;
1667 gd->flags = GENHD_FL_DRIVERFS;
1669 gd->flags |= GENHD_FL_REMOVABLE;
1671 dev_set_drvdata(dev, sdkp);
1674 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1675 sdp->removable ? "removable " : "");
1688 * sd_remove - called whenever a scsi disk (previously recognized by
1689 * sd_probe) is detached from the system. It is called (potentially
1690 * multiple times) during sd module unload.
1691 * @sdp: pointer to mid level scsi device object
1693 * Note: this function is invoked from the scsi mid-level.
1694 * This function potentially frees up a device name (e.g. /dev/sdc)
1695 * that could be re-used by a subsequent sd_probe().
1696 * This function is not called when the built-in sd driver is "exit-ed".
1698 static int sd_remove(struct device *dev)
1700 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1702 class_device_del(&sdkp->cdev);
1703 del_gendisk(sdkp->disk);
1706 mutex_lock(&sd_ref_mutex);
1707 dev_set_drvdata(dev, NULL);
1708 class_device_put(&sdkp->cdev);
1709 mutex_unlock(&sd_ref_mutex);
1715 * scsi_disk_release - Called to free the scsi_disk structure
1716 * @cdev: pointer to embedded class device
1718 * sd_ref_mutex must be held entering this routine. Because it is
1719 * called on last put, you should always use the scsi_disk_get()
1720 * scsi_disk_put() helpers which manipulate the semaphore directly
1721 * and never do a direct class_device_put().
1723 static void scsi_disk_release(struct class_device *cdev)
1725 struct scsi_disk *sdkp = to_scsi_disk(cdev);
1726 struct gendisk *disk = sdkp->disk;
1728 spin_lock(&sd_index_lock);
1729 idr_remove(&sd_index_idr, sdkp->index);
1730 spin_unlock(&sd_index_lock);
1732 disk->private_data = NULL;
1734 put_device(&sdkp->device->sdev_gendev);
1739 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1741 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1742 struct scsi_sense_hdr sshdr;
1743 struct scsi_device *sdp = sdkp->device;
1747 cmd[4] |= 1; /* START */
1749 if (!scsi_device_online(sdp))
1752 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1753 SD_TIMEOUT, SD_MAX_RETRIES);
1755 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1756 sd_print_result(sdkp, res);
1757 if (driver_byte(res) & DRIVER_SENSE)
1758 sd_print_sense_hdr(sdkp, &sshdr);
1765 * Send a SYNCHRONIZE CACHE instruction down to the device through
1766 * the normal SCSI command structure. Wait for the command to
1769 static void sd_shutdown(struct device *dev)
1771 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1774 return; /* this can happen */
1777 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1778 sd_sync_cache(sdkp);
1781 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1782 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1783 sd_start_stop_device(sdkp, 0);
1786 scsi_disk_put(sdkp);
1789 static int sd_suspend(struct device *dev, pm_message_t mesg)
1791 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1795 return 0; /* this can happen */
1798 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1799 ret = sd_sync_cache(sdkp);
1804 if (mesg.event == PM_EVENT_SUSPEND &&
1805 sdkp->device->manage_start_stop) {
1806 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1807 ret = sd_start_stop_device(sdkp, 0);
1811 scsi_disk_put(sdkp);
1815 static int sd_resume(struct device *dev)
1817 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1820 if (!sdkp->device->manage_start_stop)
1823 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
1824 ret = sd_start_stop_device(sdkp, 1);
1827 scsi_disk_put(sdkp);
1832 * init_sd - entry point for this driver (both when built in or when
1835 * Note: this function registers this driver with the scsi mid-level.
1837 static int __init init_sd(void)
1839 int majors = 0, i, err;
1841 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1843 for (i = 0; i < SD_MAJORS; i++)
1844 if (register_blkdev(sd_major(i), "sd") == 0)
1850 err = class_register(&sd_disk_class);
1854 err = scsi_register_driver(&sd_template.gendrv);
1861 class_unregister(&sd_disk_class);
1863 for (i = 0; i < SD_MAJORS; i++)
1864 unregister_blkdev(sd_major(i), "sd");
1869 * exit_sd - exit point for this driver (when it is a module).
1871 * Note: this function unregisters this driver from the scsi mid-level.
1873 static void __exit exit_sd(void)
1877 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1879 scsi_unregister_driver(&sd_template.gendrv);
1880 class_unregister(&sd_disk_class);
1882 for (i = 0; i < SD_MAJORS; i++)
1883 unregister_blkdev(sd_major(i), "sd");
1886 module_init(init_sd);
1887 module_exit(exit_sd);
1889 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1890 struct scsi_sense_hdr *sshdr)
1892 sd_printk(KERN_INFO, sdkp, "");
1893 scsi_show_sense_hdr(sshdr);
1894 sd_printk(KERN_INFO, sdkp, "");
1895 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1898 static void sd_print_result(struct scsi_disk *sdkp, int result)
1900 sd_printk(KERN_INFO, sdkp, "");
1901 scsi_show_result(result);