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 int sd_revalidate_disk(struct gendisk *);
90 static int sd_probe(struct device *);
91 static int sd_remove(struct device *);
92 static void sd_shutdown(struct device *);
93 static int sd_suspend(struct device *, pm_message_t state);
94 static int sd_resume(struct device *);
95 static void sd_rescan(struct device *);
96 static int sd_done(struct scsi_cmnd *);
97 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
98 static void scsi_disk_release(struct class_device *cdev);
99 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
100 static void sd_print_result(struct scsi_disk *, int);
102 static DEFINE_IDR(sd_index_idr);
103 static DEFINE_SPINLOCK(sd_index_lock);
105 /* This semaphore is used to mediate the 0->1 reference get in the
106 * face of object destruction (i.e. we can't allow a get on an
107 * object after last put) */
108 static DEFINE_MUTEX(sd_ref_mutex);
110 static const char *sd_cache_types[] = {
111 "write through", "none", "write back",
112 "write back, no read (daft)"
115 static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
118 int i, ct = -1, rcd, wce, sp;
119 struct scsi_disk *sdkp = to_scsi_disk(cdev);
120 struct scsi_device *sdp = sdkp->device;
123 struct scsi_mode_data data;
124 struct scsi_sense_hdr sshdr;
127 if (sdp->type != TYPE_DISK)
128 /* no cache control on RBC devices; theoretically they
129 * can do it, but there's probably so many exceptions
130 * it's not worth the risk */
133 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
134 const int len = strlen(sd_cache_types[i]);
135 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
143 rcd = ct & 0x01 ? 1 : 0;
144 wce = ct & 0x02 ? 1 : 0;
145 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
146 SD_MAX_RETRIES, &data, NULL))
148 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
149 data.block_descriptor_length);
150 buffer_data = buffer + data.header_length +
151 data.block_descriptor_length;
152 buffer_data[2] &= ~0x05;
153 buffer_data[2] |= wce << 2 | rcd;
154 sp = buffer_data[0] & 0x80 ? 1 : 0;
156 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
157 SD_MAX_RETRIES, &data, &sshdr)) {
158 if (scsi_sense_valid(&sshdr))
159 sd_print_sense_hdr(sdkp, &sshdr);
162 sd_revalidate_disk(sdkp->disk);
166 static ssize_t sd_store_manage_start_stop(struct class_device *cdev,
167 const char *buf, size_t count)
169 struct scsi_disk *sdkp = to_scsi_disk(cdev);
170 struct scsi_device *sdp = sdkp->device;
172 if (!capable(CAP_SYS_ADMIN))
175 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
180 static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
183 struct scsi_disk *sdkp = to_scsi_disk(cdev);
184 struct scsi_device *sdp = sdkp->device;
186 if (!capable(CAP_SYS_ADMIN))
189 if (sdp->type != TYPE_DISK)
192 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
197 static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
199 struct scsi_disk *sdkp = to_scsi_disk(cdev);
200 int ct = sdkp->RCD + 2*sdkp->WCE;
202 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
205 static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
207 struct scsi_disk *sdkp = to_scsi_disk(cdev);
209 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
212 static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf)
214 struct scsi_disk *sdkp = to_scsi_disk(cdev);
215 struct scsi_device *sdp = sdkp->device;
217 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
220 static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
222 struct scsi_disk *sdkp = to_scsi_disk(cdev);
224 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
227 static struct class_device_attribute sd_disk_attrs[] = {
228 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
229 sd_store_cache_type),
230 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
231 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
232 sd_store_allow_restart),
233 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
234 sd_store_manage_start_stop),
238 static struct class sd_disk_class = {
240 .owner = THIS_MODULE,
241 .release = scsi_disk_release,
242 .class_dev_attrs = sd_disk_attrs,
245 static struct scsi_driver sd_template = {
246 .owner = THIS_MODULE,
251 .suspend = sd_suspend,
253 .shutdown = sd_shutdown,
260 * Device no to disk mapping:
262 * major disc2 disc p1
263 * |............|.............|....|....| <- dev_t
266 * Inside a major, we have 16k disks, however mapped non-
267 * contiguously. The first 16 disks are for major0, the next
268 * ones with major1, ... Disk 256 is for major0 again, disk 272
270 * As we stay compatible with our numbering scheme, we can reuse
271 * the well-know SCSI majors 8, 65--71, 136--143.
273 static int sd_major(int major_idx)
277 return SCSI_DISK0_MAJOR;
279 return SCSI_DISK1_MAJOR + major_idx - 1;
281 return SCSI_DISK8_MAJOR + major_idx - 8;
284 return 0; /* shut up gcc */
288 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
290 return container_of(disk->private_data, struct scsi_disk, driver);
293 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
295 struct scsi_disk *sdkp = NULL;
297 if (disk->private_data) {
298 sdkp = scsi_disk(disk);
299 if (scsi_device_get(sdkp->device) == 0)
300 class_device_get(&sdkp->cdev);
307 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
309 struct scsi_disk *sdkp;
311 mutex_lock(&sd_ref_mutex);
312 sdkp = __scsi_disk_get(disk);
313 mutex_unlock(&sd_ref_mutex);
317 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
319 struct scsi_disk *sdkp;
321 mutex_lock(&sd_ref_mutex);
322 sdkp = dev_get_drvdata(dev);
324 sdkp = __scsi_disk_get(sdkp->disk);
325 mutex_unlock(&sd_ref_mutex);
329 static void scsi_disk_put(struct scsi_disk *sdkp)
331 struct scsi_device *sdev = sdkp->device;
333 mutex_lock(&sd_ref_mutex);
334 class_device_put(&sdkp->cdev);
335 scsi_device_put(sdev);
336 mutex_unlock(&sd_ref_mutex);
340 * sd_init_command - build a scsi (read or write) command from
341 * information in the request structure.
342 * @SCpnt: pointer to mid-level's per scsi command structure that
343 * contains request and into which the scsi command is written
345 * Returns 1 if successful and 0 if error (or cannot be done now).
347 static int sd_prep_fn(struct request_queue *q, struct request *rq)
349 struct scsi_cmnd *SCpnt;
350 struct scsi_device *sdp = q->queuedata;
351 struct gendisk *disk = rq->rq_disk;
352 sector_t block = rq->sector;
353 unsigned int this_count = rq->nr_sectors;
354 unsigned int timeout = sdp->timeout;
357 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
358 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
360 } else if (rq->cmd_type != REQ_TYPE_FS) {
364 ret = scsi_setup_fs_cmnd(sdp, rq);
365 if (ret != BLKPREP_OK)
369 /* from here on until we're complete, any goto out
370 * is used for a killable error condition */
373 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
374 "sd_init_command: block=%llu, "
376 (unsigned long long)block,
379 if (!sdp || !scsi_device_online(sdp) ||
380 block + rq->nr_sectors > get_capacity(disk)) {
381 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
382 "Finishing %ld sectors\n",
384 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
385 "Retry with 0x%p\n", SCpnt));
391 * quietly refuse to do anything to a changed disc until
392 * the changed bit has been reset
394 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
398 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
399 (unsigned long long)block));
402 * If we have a 1K hardware sectorsize, prevent access to single
403 * 512 byte sectors. In theory we could handle this - in fact
404 * the scsi cdrom driver must be able to handle this because
405 * we typically use 1K blocksizes, and cdroms typically have
406 * 2K hardware sectorsizes. Of course, things are simpler
407 * with the cdrom, since it is read-only. For performance
408 * reasons, the filesystems should be able to handle this
409 * and not force the scsi disk driver to use bounce buffers
412 if (sdp->sector_size == 1024) {
413 if ((block & 1) || (rq->nr_sectors & 1)) {
414 scmd_printk(KERN_ERR, SCpnt,
415 "Bad block number requested\n");
419 this_count = this_count >> 1;
422 if (sdp->sector_size == 2048) {
423 if ((block & 3) || (rq->nr_sectors & 3)) {
424 scmd_printk(KERN_ERR, SCpnt,
425 "Bad block number requested\n");
429 this_count = this_count >> 2;
432 if (sdp->sector_size == 4096) {
433 if ((block & 7) || (rq->nr_sectors & 7)) {
434 scmd_printk(KERN_ERR, SCpnt,
435 "Bad block number requested\n");
439 this_count = this_count >> 3;
442 if (rq_data_dir(rq) == WRITE) {
443 if (!sdp->writeable) {
446 SCpnt->cmnd[0] = WRITE_6;
447 SCpnt->sc_data_direction = DMA_TO_DEVICE;
448 } else if (rq_data_dir(rq) == READ) {
449 SCpnt->cmnd[0] = READ_6;
450 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
452 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
456 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
457 "%s %d/%ld 512 byte blocks.\n",
458 (rq_data_dir(rq) == WRITE) ?
459 "writing" : "reading", this_count,
464 if (block > 0xffffffff) {
465 SCpnt->cmnd[0] += READ_16 - READ_6;
466 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
467 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
468 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
469 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
470 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
471 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
472 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
473 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
474 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
475 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
476 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
477 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
478 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
479 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
480 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
481 SCpnt->device->use_10_for_rw) {
482 if (this_count > 0xffff)
485 SCpnt->cmnd[0] += READ_10 - READ_6;
486 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
487 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
488 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
489 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
490 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
491 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
492 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
493 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
495 if (unlikely(blk_fua_rq(rq))) {
497 * This happens only if this drive failed
498 * 10byte rw command with ILLEGAL_REQUEST
499 * during operation and thus turned off
502 scmd_printk(KERN_ERR, SCpnt,
503 "FUA write on READ/WRITE(6) drive\n");
507 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
508 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
509 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
510 SCpnt->cmnd[4] = (unsigned char) this_count;
513 SCpnt->request_bufflen = this_count * sdp->sector_size;
516 * We shouldn't disconnect in the middle of a sector, so with a dumb
517 * host adapter, it's safe to assume that we can at least transfer
518 * this many bytes between each connect / disconnect.
520 SCpnt->transfersize = sdp->sector_size;
521 SCpnt->underflow = this_count << 9;
522 SCpnt->allowed = SD_MAX_RETRIES;
523 SCpnt->timeout_per_command = timeout;
526 * This indicates that the command is ready from our end to be
531 return scsi_prep_return(q, rq, ret);
535 * sd_open - open a scsi disk device
536 * @inode: only i_rdev member may be used
537 * @filp: only f_mode and f_flags may be used
539 * Returns 0 if successful. Returns a negated errno value in case
542 * Note: This can be called from a user context (e.g. fsck(1) )
543 * or from within the kernel (e.g. as a result of a mount(1) ).
544 * In the latter case @inode and @filp carry an abridged amount
545 * of information as noted above.
547 static int sd_open(struct inode *inode, struct file *filp)
549 struct gendisk *disk = inode->i_bdev->bd_disk;
550 struct scsi_disk *sdkp;
551 struct scsi_device *sdev;
554 if (!(sdkp = scsi_disk_get(disk)))
558 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
563 * If the device is in error recovery, wait until it is done.
564 * If the device is offline, then disallow any access to it.
567 if (!scsi_block_when_processing_errors(sdev))
570 if (sdev->removable || sdkp->write_prot)
571 check_disk_change(inode->i_bdev);
574 * If the drive is empty, just let the open fail.
577 if (sdev->removable && !sdkp->media_present &&
578 !(filp->f_flags & O_NDELAY))
582 * If the device has the write protect tab set, have the open fail
583 * if the user expects to be able to write to the thing.
586 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
590 * It is possible that the disk changing stuff resulted in
591 * the device being taken offline. If this is the case,
592 * report this to the user, and don't pretend that the
593 * open actually succeeded.
596 if (!scsi_device_online(sdev))
599 if (!sdkp->openers++ && sdev->removable) {
600 if (scsi_block_when_processing_errors(sdev))
601 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
612 * sd_release - invoked when the (last) close(2) is called on this
614 * @inode: only i_rdev member may be used
615 * @filp: only f_mode and f_flags may be used
619 * Note: may block (uninterruptible) if error recovery is underway
622 static int sd_release(struct inode *inode, struct file *filp)
624 struct gendisk *disk = inode->i_bdev->bd_disk;
625 struct scsi_disk *sdkp = scsi_disk(disk);
626 struct scsi_device *sdev = sdkp->device;
628 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
630 if (!--sdkp->openers && sdev->removable) {
631 if (scsi_block_when_processing_errors(sdev))
632 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
636 * XXX and what if there are packets in flight and this close()
637 * XXX is followed by a "rmmod sd_mod"?
643 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
645 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
646 struct scsi_device *sdp = sdkp->device;
647 struct Scsi_Host *host = sdp->host;
650 /* default to most commonly used values */
651 diskinfo[0] = 0x40; /* 1 << 6 */
652 diskinfo[1] = 0x20; /* 1 << 5 */
653 diskinfo[2] = sdkp->capacity >> 11;
655 /* override with calculated, extended default, or driver values */
656 if (host->hostt->bios_param)
657 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
659 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
661 geo->heads = diskinfo[0];
662 geo->sectors = diskinfo[1];
663 geo->cylinders = diskinfo[2];
668 * sd_ioctl - process an ioctl
669 * @inode: only i_rdev/i_bdev members may be used
670 * @filp: only f_mode and f_flags may be used
671 * @cmd: ioctl command number
672 * @arg: this is third argument given to ioctl(2) system call.
673 * Often contains a pointer.
675 * Returns 0 if successful (some ioctls return postive numbers on
676 * success as well). Returns a negated errno value in case of error.
678 * Note: most ioctls are forward onto the block subsystem or further
679 * down in the scsi subsystem.
681 static int sd_ioctl(struct inode * inode, struct file * filp,
682 unsigned int cmd, unsigned long arg)
684 struct block_device *bdev = inode->i_bdev;
685 struct gendisk *disk = bdev->bd_disk;
686 struct scsi_device *sdp = scsi_disk(disk)->device;
687 void __user *p = (void __user *)arg;
690 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
691 disk->disk_name, cmd));
694 * If we are in the middle of error recovery, don't let anyone
695 * else try and use this device. Also, if error recovery fails, it
696 * may try and take the device offline, in which case all further
697 * access to the device is prohibited.
699 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
700 if (!scsi_block_when_processing_errors(sdp) || !error)
704 * Send SCSI addressing ioctls directly to mid level, send other
705 * ioctls to block level and then onto mid level if they can't be
709 case SCSI_IOCTL_GET_IDLUN:
710 case SCSI_IOCTL_GET_BUS_NUMBER:
711 return scsi_ioctl(sdp, cmd, p);
713 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
714 if (error != -ENOTTY)
717 return scsi_ioctl(sdp, cmd, p);
720 static void set_media_not_present(struct scsi_disk *sdkp)
722 sdkp->media_present = 0;
724 sdkp->device->changed = 1;
728 * sd_media_changed - check if our medium changed
729 * @disk: kernel device descriptor
731 * Returns 0 if not applicable or no change; 1 if change
733 * Note: this function is invoked from the block subsystem.
735 static int sd_media_changed(struct gendisk *disk)
737 struct scsi_disk *sdkp = scsi_disk(disk);
738 struct scsi_device *sdp = sdkp->device;
741 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
747 * If the device is offline, don't send any commands - just pretend as
748 * if the command failed. If the device ever comes back online, we
749 * can deal with it then. It is only because of unrecoverable errors
750 * that we would ever take a device offline in the first place.
752 if (!scsi_device_online(sdp)) {
753 set_media_not_present(sdkp);
759 * Using TEST_UNIT_READY enables differentiation between drive with
760 * no cartridge loaded - NOT READY, drive with changed cartridge -
761 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
763 * Drives that auto spin down. eg iomega jaz 1G, will be started
764 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
765 * sd_revalidate() is called.
769 if (scsi_block_when_processing_errors(sdp))
770 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
773 * Unable to test, unit probably not ready. This usually
774 * means there is no disc in the drive. Mark as changed,
775 * and we will figure it out later once the drive is
779 set_media_not_present(sdkp);
785 * For removable scsi disk we have to recognise the presence
786 * of a disk in the drive. This is kept in the struct scsi_disk
787 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
789 sdkp->media_present = 1;
791 retval = sdp->changed;
794 if (retval != sdkp->previous_state)
795 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
796 sdkp->previous_state = retval;
800 static int sd_sync_cache(struct scsi_disk *sdkp)
803 struct scsi_device *sdp = sdkp->device;
804 struct scsi_sense_hdr sshdr;
806 if (!scsi_device_online(sdp))
810 for (retries = 3; retries > 0; --retries) {
811 unsigned char cmd[10] = { 0 };
813 cmd[0] = SYNCHRONIZE_CACHE;
815 * Leave the rest of the command zero to indicate
818 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
819 SD_TIMEOUT, SD_MAX_RETRIES);
825 sd_print_result(sdkp, res);
826 if (driver_byte(res) & DRIVER_SENSE)
827 sd_print_sense_hdr(sdkp, &sshdr);
835 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
837 memset(rq->cmd, 0, sizeof(rq->cmd));
838 rq->cmd_type = REQ_TYPE_BLOCK_PC;
839 rq->timeout = SD_TIMEOUT;
840 rq->cmd[0] = SYNCHRONIZE_CACHE;
844 static void sd_rescan(struct device *dev)
846 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
849 sd_revalidate_disk(sdkp->disk);
857 * This gets directly called from VFS. When the ioctl
858 * is not recognized we go back to the other translation paths.
860 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
862 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
863 struct gendisk *disk = bdev->bd_disk;
864 struct scsi_device *sdev = scsi_disk(disk)->device;
867 * If we are in the middle of error recovery, don't let anyone
868 * else try and use this device. Also, if error recovery fails, it
869 * may try and take the device offline, in which case all further
870 * access to the device is prohibited.
872 if (!scsi_block_when_processing_errors(sdev))
875 if (sdev->host->hostt->compat_ioctl) {
878 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
884 * Let the static ioctl translation table take care of it.
890 static struct block_device_operations sd_fops = {
891 .owner = THIS_MODULE,
893 .release = sd_release,
897 .compat_ioctl = sd_compat_ioctl,
899 .media_changed = sd_media_changed,
900 .revalidate_disk = sd_revalidate_disk,
904 * sd_done - bottom half handler: called when the lower level
905 * driver has completed (successfully or otherwise) a scsi command.
906 * @SCpnt: mid-level's per command structure.
908 * Note: potentially run from within an ISR. Must not block.
910 static int sd_done(struct scsi_cmnd *SCpnt)
912 int result = SCpnt->result;
913 unsigned int xfer_size = SCpnt->request_bufflen;
914 unsigned int good_bytes = result ? 0 : xfer_size;
915 u64 start_lba = SCpnt->request->sector;
917 struct scsi_sense_hdr sshdr;
919 int sense_deferred = 0;
923 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
925 sense_deferred = scsi_sense_is_deferred(&sshdr);
927 #ifdef CONFIG_SCSI_LOGGING
928 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
930 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
931 "sd_done: sb[respc,sk,asc,"
932 "ascq]=%x,%x,%x,%x\n",
934 sshdr.sense_key, sshdr.asc,
938 if (driver_byte(result) != DRIVER_SENSE &&
939 (!sense_valid || sense_deferred))
942 switch (sshdr.sense_key) {
945 if (!blk_fs_request(SCpnt->request))
947 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
948 SCSI_SENSE_BUFFERSIZE,
952 if (xfer_size <= SCpnt->device->sector_size)
954 switch (SCpnt->device->sector_size) {
970 /* Print something here with limiting frequency. */
974 /* This computation should always be done in terms of
975 * the resolution of the device's medium.
977 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
979 case RECOVERED_ERROR:
981 /* Inform the user, but make sure that it's not treated
984 scsi_print_sense("sd", SCpnt);
986 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
987 good_bytes = xfer_size;
989 case ILLEGAL_REQUEST:
990 if (SCpnt->device->use_10_for_rw &&
991 (SCpnt->cmnd[0] == READ_10 ||
992 SCpnt->cmnd[0] == WRITE_10))
993 SCpnt->device->use_10_for_rw = 0;
994 if (SCpnt->device->use_10_for_ms &&
995 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
996 SCpnt->cmnd[0] == MODE_SELECT_10))
997 SCpnt->device->use_10_for_ms = 0;
1006 static int media_not_present(struct scsi_disk *sdkp,
1007 struct scsi_sense_hdr *sshdr)
1010 if (!scsi_sense_valid(sshdr))
1012 /* not invoked for commands that could return deferred errors */
1013 if (sshdr->sense_key != NOT_READY &&
1014 sshdr->sense_key != UNIT_ATTENTION)
1016 if (sshdr->asc != 0x3A) /* medium not present */
1019 set_media_not_present(sdkp);
1024 * spinup disk - called only in sd_revalidate_disk()
1027 sd_spinup_disk(struct scsi_disk *sdkp)
1029 unsigned char cmd[10];
1030 unsigned long spintime_expire = 0;
1031 int retries, spintime;
1032 unsigned int the_result;
1033 struct scsi_sense_hdr sshdr;
1034 int sense_valid = 0;
1038 /* Spin up drives, as required. Only do this at boot time */
1039 /* Spinup needs to be done for module loads too. */
1044 cmd[0] = TEST_UNIT_READY;
1045 memset((void *) &cmd[1], 0, 9);
1047 the_result = scsi_execute_req(sdkp->device, cmd,
1053 * If the drive has indicated to us that it
1054 * doesn't have any media in it, don't bother
1055 * with any more polling.
1057 if (media_not_present(sdkp, &sshdr))
1061 sense_valid = scsi_sense_valid(&sshdr);
1063 } while (retries < 3 &&
1064 (!scsi_status_is_good(the_result) ||
1065 ((driver_byte(the_result) & DRIVER_SENSE) &&
1066 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1068 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1069 /* no sense, TUR either succeeded or failed
1070 * with a status error */
1071 if(!spintime && !scsi_status_is_good(the_result)) {
1072 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1073 sd_print_result(sdkp, the_result);
1079 * The device does not want the automatic start to be issued.
1081 if (sdkp->device->no_start_on_add) {
1086 * If manual intervention is required, or this is an
1087 * absent USB storage device, a spinup is meaningless.
1090 sshdr.sense_key == NOT_READY &&
1091 sshdr.asc == 4 && sshdr.ascq == 3) {
1092 break; /* manual intervention required */
1095 * Issue command to spin up drive when not ready
1097 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1099 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1100 cmd[0] = START_STOP;
1101 cmd[1] = 1; /* Return immediately */
1102 memset((void *) &cmd[2], 0, 8);
1103 cmd[4] = 1; /* Start spin cycle */
1104 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1106 SD_TIMEOUT, SD_MAX_RETRIES);
1107 spintime_expire = jiffies + 100 * HZ;
1110 /* Wait 1 second for next try */
1115 * Wait for USB flash devices with slow firmware.
1116 * Yes, this sense key/ASC combination shouldn't
1117 * occur here. It's characteristic of these devices.
1119 } else if (sense_valid &&
1120 sshdr.sense_key == UNIT_ATTENTION &&
1121 sshdr.asc == 0x28) {
1123 spintime_expire = jiffies + 5 * HZ;
1126 /* Wait 1 second for next try */
1129 /* we don't understand the sense code, so it's
1130 * probably pointless to loop */
1132 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1133 sd_print_sense_hdr(sdkp, &sshdr);
1138 } while (spintime && time_before_eq(jiffies, spintime_expire));
1141 if (scsi_status_is_good(the_result))
1144 printk("not responding...\n");
1149 * read disk capacity
1152 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1154 unsigned char cmd[16];
1155 int the_result, retries;
1156 int sector_size = 0;
1158 struct scsi_sense_hdr sshdr;
1159 int sense_valid = 0;
1160 struct scsi_device *sdp = sdkp->device;
1166 memset((void *) cmd, 0, 16);
1167 cmd[0] = SERVICE_ACTION_IN;
1168 cmd[1] = SAI_READ_CAPACITY_16;
1170 memset((void *) buffer, 0, 12);
1172 cmd[0] = READ_CAPACITY;
1173 memset((void *) &cmd[1], 0, 9);
1174 memset((void *) buffer, 0, 8);
1177 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1178 buffer, longrc ? 12 : 8, &sshdr,
1179 SD_TIMEOUT, SD_MAX_RETRIES);
1181 if (media_not_present(sdkp, &sshdr))
1185 sense_valid = scsi_sense_valid(&sshdr);
1188 } while (the_result && retries);
1190 if (the_result && !longrc) {
1191 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1192 sd_print_result(sdkp, the_result);
1193 if (driver_byte(the_result) & DRIVER_SENSE)
1194 sd_print_sense_hdr(sdkp, &sshdr);
1196 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1198 /* Set dirty bit for removable devices if not ready -
1199 * sometimes drives will not report this properly. */
1200 if (sdp->removable &&
1201 sense_valid && sshdr.sense_key == NOT_READY)
1204 /* Either no media are present but the drive didn't tell us,
1205 or they are present but the read capacity command fails */
1206 /* sdkp->media_present = 0; -- not always correct */
1207 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1210 } else if (the_result && longrc) {
1211 /* READ CAPACITY(16) has been failed */
1212 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1213 sd_print_result(sdkp, the_result);
1214 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1216 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1221 sector_size = (buffer[4] << 24) |
1222 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1223 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1224 buffer[2] == 0xff && buffer[3] == 0xff) {
1225 if(sizeof(sdkp->capacity) > 4) {
1226 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1227 "Trying to use READ CAPACITY(16).\n");
1231 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1232 "a kernel compiled with support for large "
1233 "block devices.\n");
1237 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1242 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1243 ((u64)buffer[1] << 48) |
1244 ((u64)buffer[2] << 40) |
1245 ((u64)buffer[3] << 32) |
1246 ((sector_t)buffer[4] << 24) |
1247 ((sector_t)buffer[5] << 16) |
1248 ((sector_t)buffer[6] << 8) |
1249 (sector_t)buffer[7]);
1251 sector_size = (buffer[8] << 24) |
1252 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1255 /* Some devices return the total number of sectors, not the
1256 * highest sector number. Make the necessary adjustment. */
1257 if (sdp->fix_capacity) {
1260 /* Some devices have version which report the correct sizes
1261 * and others which do not. We guess size according to a heuristic
1262 * and err on the side of lowering the capacity. */
1264 if (sdp->guess_capacity)
1265 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1270 if (sector_size == 0) {
1272 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1276 if (sector_size != 512 &&
1277 sector_size != 1024 &&
1278 sector_size != 2048 &&
1279 sector_size != 4096 &&
1280 sector_size != 256) {
1281 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1284 * The user might want to re-format the drive with
1285 * a supported sectorsize. Once this happens, it
1286 * would be relatively trivial to set the thing up.
1287 * For this reason, we leave the thing in the table.
1291 * set a bogus sector size so the normal read/write
1292 * logic in the block layer will eventually refuse any
1293 * request on this device without tripping over power
1294 * of two sector size assumptions
1300 * The msdos fs needs to know the hardware sector size
1301 * So I have created this table. See ll_rw_blk.c
1302 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1304 int hard_sector = sector_size;
1305 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1306 struct request_queue *queue = sdp->request_queue;
1309 blk_queue_hardsect_size(queue, hard_sector);
1310 /* avoid 64-bit division on 32-bit platforms */
1311 sector_div(sz, 625);
1313 sector_div(mb, 1950);
1315 sd_printk(KERN_NOTICE, sdkp,
1316 "%llu %d-byte hardware sectors (%llu MB)\n",
1317 (unsigned long long)sdkp->capacity,
1318 hard_sector, (unsigned long long)mb);
1321 /* Rescale capacity to 512-byte units */
1322 if (sector_size == 4096)
1323 sdkp->capacity <<= 3;
1324 else if (sector_size == 2048)
1325 sdkp->capacity <<= 2;
1326 else if (sector_size == 1024)
1327 sdkp->capacity <<= 1;
1328 else if (sector_size == 256)
1329 sdkp->capacity >>= 1;
1331 sdkp->device->sector_size = sector_size;
1334 /* called with buffer of length 512 */
1336 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1337 unsigned char *buffer, int len, struct scsi_mode_data *data,
1338 struct scsi_sense_hdr *sshdr)
1340 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1341 SD_TIMEOUT, SD_MAX_RETRIES, data,
1346 * read write protect setting, if possible - called only in sd_revalidate_disk()
1347 * called with buffer of length SD_BUF_SIZE
1350 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1353 struct scsi_device *sdp = sdkp->device;
1354 struct scsi_mode_data data;
1356 set_disk_ro(sdkp->disk, 0);
1357 if (sdp->skip_ms_page_3f) {
1358 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1362 if (sdp->use_192_bytes_for_3f) {
1363 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1366 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1367 * We have to start carefully: some devices hang if we ask
1368 * for more than is available.
1370 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1373 * Second attempt: ask for page 0 When only page 0 is
1374 * implemented, a request for page 3F may return Sense Key
1375 * 5: Illegal Request, Sense Code 24: Invalid field in
1378 if (!scsi_status_is_good(res))
1379 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1382 * Third attempt: ask 255 bytes, as we did earlier.
1384 if (!scsi_status_is_good(res))
1385 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1389 if (!scsi_status_is_good(res)) {
1390 sd_printk(KERN_WARNING, sdkp,
1391 "Test WP failed, assume Write Enabled\n");
1393 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1394 set_disk_ro(sdkp->disk, sdkp->write_prot);
1395 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1396 sdkp->write_prot ? "on" : "off");
1397 sd_printk(KERN_DEBUG, sdkp,
1398 "Mode Sense: %02x %02x %02x %02x\n",
1399 buffer[0], buffer[1], buffer[2], buffer[3]);
1404 * sd_read_cache_type - called only from sd_revalidate_disk()
1405 * called with buffer of length SD_BUF_SIZE
1408 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1411 struct scsi_device *sdp = sdkp->device;
1415 struct scsi_mode_data data;
1416 struct scsi_sense_hdr sshdr;
1418 if (sdp->skip_ms_page_8)
1421 if (sdp->type == TYPE_RBC) {
1429 /* cautiously ask */
1430 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1432 if (!scsi_status_is_good(res))
1435 if (!data.header_length) {
1437 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1440 /* that went OK, now ask for the proper length */
1444 * We're only interested in the first three bytes, actually.
1445 * But the data cache page is defined for the first 20.
1452 /* Take headers and block descriptors into account */
1453 len += data.header_length + data.block_descriptor_length;
1454 if (len > SD_BUF_SIZE)
1458 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1460 if (scsi_status_is_good(res)) {
1461 int offset = data.header_length + data.block_descriptor_length;
1463 if (offset >= SD_BUF_SIZE - 2) {
1464 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1468 if ((buffer[offset] & 0x3f) != modepage) {
1469 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1473 if (modepage == 8) {
1474 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1475 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1477 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1481 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1482 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1483 sd_printk(KERN_NOTICE, sdkp,
1484 "Uses READ/WRITE(6), disabling FUA\n");
1488 sd_printk(KERN_NOTICE, sdkp,
1489 "Write cache: %s, read cache: %s, %s\n",
1490 sdkp->WCE ? "enabled" : "disabled",
1491 sdkp->RCD ? "disabled" : "enabled",
1492 sdkp->DPOFUA ? "supports DPO and FUA"
1493 : "doesn't support DPO or FUA");
1499 if (scsi_sense_valid(&sshdr) &&
1500 sshdr.sense_key == ILLEGAL_REQUEST &&
1501 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1502 /* Invalid field in CDB */
1503 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1505 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1508 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1515 * sd_revalidate_disk - called the first time a new disk is seen,
1516 * performs disk spin up, read_capacity, etc.
1517 * @disk: struct gendisk we care about
1519 static int sd_revalidate_disk(struct gendisk *disk)
1521 struct scsi_disk *sdkp = scsi_disk(disk);
1522 struct scsi_device *sdp = sdkp->device;
1523 unsigned char *buffer;
1526 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1527 "sd_revalidate_disk\n"));
1530 * If the device is offline, don't try and read capacity or any
1531 * of the other niceties.
1533 if (!scsi_device_online(sdp))
1536 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1538 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1539 "allocation failure.\n");
1543 /* defaults, until the device tells us otherwise */
1544 sdp->sector_size = 512;
1546 sdkp->media_present = 1;
1547 sdkp->write_prot = 0;
1551 sd_spinup_disk(sdkp);
1554 * Without media there is no reason to ask; moreover, some devices
1555 * react badly if we do.
1557 if (sdkp->media_present) {
1558 sd_read_capacity(sdkp, buffer);
1559 sd_read_write_protect_flag(sdkp, buffer);
1560 sd_read_cache_type(sdkp, buffer);
1564 * We now have all cache related info, determine how we deal
1565 * with ordered requests. Note that as the current SCSI
1566 * dispatch function can alter request order, we cannot use
1567 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1570 ordered = sdkp->DPOFUA
1571 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1573 ordered = QUEUE_ORDERED_DRAIN;
1575 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1577 set_capacity(disk, sdkp->capacity);
1585 * sd_probe - called during driver initialization and whenever a
1586 * new scsi device is attached to the system. It is called once
1587 * for each scsi device (not just disks) present.
1588 * @dev: pointer to device object
1590 * Returns 0 if successful (or not interested in this scsi device
1591 * (e.g. scanner)); 1 when there is an error.
1593 * Note: this function is invoked from the scsi mid-level.
1594 * This function sets up the mapping between a given
1595 * <host,channel,id,lun> (found in sdp) and new device name
1596 * (e.g. /dev/sda). More precisely it is the block device major
1597 * and minor number that is chosen here.
1599 * Assume sd_attach is not re-entrant (for time being)
1600 * Also think about sd_attach() and sd_remove() running coincidentally.
1602 static int sd_probe(struct device *dev)
1604 struct scsi_device *sdp = to_scsi_device(dev);
1605 struct scsi_disk *sdkp;
1611 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1614 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1618 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1622 gd = alloc_disk(16);
1626 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1629 spin_lock(&sd_index_lock);
1630 error = idr_get_new(&sd_index_idr, NULL, &index);
1631 spin_unlock(&sd_index_lock);
1633 if (index >= SD_MAX_DISKS)
1639 sdkp->driver = &sd_template;
1641 sdkp->index = index;
1644 if (!sdp->timeout) {
1645 if (sdp->type != TYPE_MOD)
1646 sdp->timeout = SD_TIMEOUT;
1648 sdp->timeout = SD_MOD_TIMEOUT;
1651 class_device_initialize(&sdkp->cdev);
1652 sdkp->cdev.dev = &sdp->sdev_gendev;
1653 sdkp->cdev.class = &sd_disk_class;
1654 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1656 if (class_device_add(&sdkp->cdev))
1659 get_device(&sdp->sdev_gendev);
1661 gd->major = sd_major((index & 0xf0) >> 4);
1662 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1664 gd->fops = &sd_fops;
1667 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1668 } else if (index < (26 + 1) * 26) {
1669 sprintf(gd->disk_name, "sd%c%c",
1670 'a' + index / 26 - 1,'a' + index % 26);
1672 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1673 const unsigned int m2 = (index / 26 - 1) % 26;
1674 const unsigned int m3 = index % 26;
1675 sprintf(gd->disk_name, "sd%c%c%c",
1676 'a' + m1, 'a' + m2, 'a' + m3);
1679 gd->private_data = &sdkp->driver;
1680 gd->queue = sdkp->device->request_queue;
1682 sd_revalidate_disk(gd);
1684 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1686 gd->driverfs_dev = &sdp->sdev_gendev;
1687 gd->flags = GENHD_FL_DRIVERFS;
1689 gd->flags |= GENHD_FL_REMOVABLE;
1691 dev_set_drvdata(dev, sdkp);
1694 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1695 sdp->removable ? "removable " : "");
1708 * sd_remove - called whenever a scsi disk (previously recognized by
1709 * sd_probe) is detached from the system. It is called (potentially
1710 * multiple times) during sd module unload.
1711 * @sdp: pointer to mid level scsi device object
1713 * Note: this function is invoked from the scsi mid-level.
1714 * This function potentially frees up a device name (e.g. /dev/sdc)
1715 * that could be re-used by a subsequent sd_probe().
1716 * This function is not called when the built-in sd driver is "exit-ed".
1718 static int sd_remove(struct device *dev)
1720 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1722 class_device_del(&sdkp->cdev);
1723 del_gendisk(sdkp->disk);
1726 mutex_lock(&sd_ref_mutex);
1727 dev_set_drvdata(dev, NULL);
1728 class_device_put(&sdkp->cdev);
1729 mutex_unlock(&sd_ref_mutex);
1735 * scsi_disk_release - Called to free the scsi_disk structure
1736 * @cdev: pointer to embedded class device
1738 * sd_ref_mutex must be held entering this routine. Because it is
1739 * called on last put, you should always use the scsi_disk_get()
1740 * scsi_disk_put() helpers which manipulate the semaphore directly
1741 * and never do a direct class_device_put().
1743 static void scsi_disk_release(struct class_device *cdev)
1745 struct scsi_disk *sdkp = to_scsi_disk(cdev);
1746 struct gendisk *disk = sdkp->disk;
1748 spin_lock(&sd_index_lock);
1749 idr_remove(&sd_index_idr, sdkp->index);
1750 spin_unlock(&sd_index_lock);
1752 disk->private_data = NULL;
1754 put_device(&sdkp->device->sdev_gendev);
1759 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1761 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1762 struct scsi_sense_hdr sshdr;
1763 struct scsi_device *sdp = sdkp->device;
1767 cmd[4] |= 1; /* START */
1769 if (!scsi_device_online(sdp))
1772 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1773 SD_TIMEOUT, SD_MAX_RETRIES);
1775 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1776 sd_print_result(sdkp, res);
1777 if (driver_byte(res) & DRIVER_SENSE)
1778 sd_print_sense_hdr(sdkp, &sshdr);
1785 * Send a SYNCHRONIZE CACHE instruction down to the device through
1786 * the normal SCSI command structure. Wait for the command to
1789 static void sd_shutdown(struct device *dev)
1791 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1794 return; /* this can happen */
1797 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1798 sd_sync_cache(sdkp);
1801 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1802 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1803 sd_start_stop_device(sdkp, 0);
1806 scsi_disk_put(sdkp);
1809 static int sd_suspend(struct device *dev, pm_message_t mesg)
1811 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1815 return 0; /* this can happen */
1818 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1819 ret = sd_sync_cache(sdkp);
1824 if (mesg.event == PM_EVENT_SUSPEND &&
1825 sdkp->device->manage_start_stop) {
1826 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1827 ret = sd_start_stop_device(sdkp, 0);
1831 scsi_disk_put(sdkp);
1835 static int sd_resume(struct device *dev)
1837 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1840 if (!sdkp->device->manage_start_stop)
1843 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
1844 ret = sd_start_stop_device(sdkp, 1);
1847 scsi_disk_put(sdkp);
1852 * init_sd - entry point for this driver (both when built in or when
1855 * Note: this function registers this driver with the scsi mid-level.
1857 static int __init init_sd(void)
1859 int majors = 0, i, err;
1861 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1863 for (i = 0; i < SD_MAJORS; i++)
1864 if (register_blkdev(sd_major(i), "sd") == 0)
1870 err = class_register(&sd_disk_class);
1874 err = scsi_register_driver(&sd_template.gendrv);
1881 class_unregister(&sd_disk_class);
1883 for (i = 0; i < SD_MAJORS; i++)
1884 unregister_blkdev(sd_major(i), "sd");
1889 * exit_sd - exit point for this driver (when it is a module).
1891 * Note: this function unregisters this driver from the scsi mid-level.
1893 static void __exit exit_sd(void)
1897 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1899 scsi_unregister_driver(&sd_template.gendrv);
1900 class_unregister(&sd_disk_class);
1902 for (i = 0; i < SD_MAJORS; i++)
1903 unregister_blkdev(sd_major(i), "sd");
1906 module_init(init_sd);
1907 module_exit(exit_sd);
1909 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1910 struct scsi_sense_hdr *sshdr)
1912 sd_printk(KERN_INFO, sdkp, "");
1913 scsi_show_sense_hdr(sshdr);
1914 sd_printk(KERN_INFO, sdkp, "");
1915 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1918 static void sd_print_result(struct scsi_disk *sdkp, int result)
1920 sd_printk(KERN_INFO, sdkp, "");
1921 scsi_show_result(result);