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 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_IDA(sd_index_ida);
104 /* This semaphore is used to mediate the 0->1 reference get in the
105 * face of object destruction (i.e. we can't allow a get on an
106 * object after last put) */
107 static DEFINE_MUTEX(sd_ref_mutex);
109 static const char *sd_cache_types[] = {
110 "write through", "none", "write back",
111 "write back, no read (daft)"
115 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
116 const char *buf, size_t count)
118 int i, ct = -1, rcd, wce, sp;
119 struct scsi_disk *sdkp = to_scsi_disk(dev);
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);
167 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
168 const char *buf, size_t count)
170 struct scsi_disk *sdkp = to_scsi_disk(dev);
171 struct scsi_device *sdp = sdkp->device;
173 if (!capable(CAP_SYS_ADMIN))
176 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
182 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
185 struct scsi_disk *sdkp = to_scsi_disk(dev);
186 struct scsi_device *sdp = sdkp->device;
188 if (!capable(CAP_SYS_ADMIN))
191 if (sdp->type != TYPE_DISK)
194 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
200 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
203 struct scsi_disk *sdkp = to_scsi_disk(dev);
204 int ct = sdkp->RCD + 2*sdkp->WCE;
206 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
210 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
212 struct scsi_disk *sdkp = to_scsi_disk(dev);
214 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
218 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
221 struct scsi_disk *sdkp = to_scsi_disk(dev);
222 struct scsi_device *sdp = sdkp->device;
224 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
228 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
233 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
237 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
240 struct scsi_disk *sdkp = to_scsi_disk(dev);
242 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
246 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
251 return snprintf(buf, 20, "%u\n", sdkp->ATO);
254 static struct device_attribute sd_disk_attrs[] = {
255 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
256 sd_store_cache_type),
257 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
258 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
259 sd_store_allow_restart),
260 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
261 sd_store_manage_start_stop),
262 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
263 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
267 static struct class sd_disk_class = {
269 .owner = THIS_MODULE,
270 .dev_release = scsi_disk_release,
271 .dev_attrs = sd_disk_attrs,
274 static struct scsi_driver sd_template = {
275 .owner = THIS_MODULE,
280 .suspend = sd_suspend,
282 .shutdown = sd_shutdown,
289 * Device no to disk mapping:
291 * major disc2 disc p1
292 * |............|.............|....|....| <- dev_t
295 * Inside a major, we have 16k disks, however mapped non-
296 * contiguously. The first 16 disks are for major0, the next
297 * ones with major1, ... Disk 256 is for major0 again, disk 272
299 * As we stay compatible with our numbering scheme, we can reuse
300 * the well-know SCSI majors 8, 65--71, 136--143.
302 static int sd_major(int major_idx)
306 return SCSI_DISK0_MAJOR;
308 return SCSI_DISK1_MAJOR + major_idx - 1;
310 return SCSI_DISK8_MAJOR + major_idx - 8;
313 return 0; /* shut up gcc */
317 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
319 struct scsi_disk *sdkp = NULL;
321 if (disk->private_data) {
322 sdkp = scsi_disk(disk);
323 if (scsi_device_get(sdkp->device) == 0)
324 get_device(&sdkp->dev);
331 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
333 struct scsi_disk *sdkp;
335 mutex_lock(&sd_ref_mutex);
336 sdkp = __scsi_disk_get(disk);
337 mutex_unlock(&sd_ref_mutex);
341 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
343 struct scsi_disk *sdkp;
345 mutex_lock(&sd_ref_mutex);
346 sdkp = dev_get_drvdata(dev);
348 sdkp = __scsi_disk_get(sdkp->disk);
349 mutex_unlock(&sd_ref_mutex);
353 static void scsi_disk_put(struct scsi_disk *sdkp)
355 struct scsi_device *sdev = sdkp->device;
357 mutex_lock(&sd_ref_mutex);
358 put_device(&sdkp->dev);
359 scsi_device_put(sdev);
360 mutex_unlock(&sd_ref_mutex);
364 * sd_init_command - build a scsi (read or write) command from
365 * information in the request structure.
366 * @SCpnt: pointer to mid-level's per scsi command structure that
367 * contains request and into which the scsi command is written
369 * Returns 1 if successful and 0 if error (or cannot be done now).
371 static int sd_prep_fn(struct request_queue *q, struct request *rq)
373 struct scsi_cmnd *SCpnt;
374 struct scsi_device *sdp = q->queuedata;
375 struct gendisk *disk = rq->rq_disk;
376 sector_t block = rq->sector;
377 unsigned int this_count = rq->nr_sectors;
378 unsigned int timeout = sdp->timeout;
381 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
382 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
384 } else if (rq->cmd_type != REQ_TYPE_FS) {
388 ret = scsi_setup_fs_cmnd(sdp, rq);
389 if (ret != BLKPREP_OK)
393 /* from here on until we're complete, any goto out
394 * is used for a killable error condition */
397 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
398 "sd_init_command: block=%llu, "
400 (unsigned long long)block,
403 if (!sdp || !scsi_device_online(sdp) ||
404 block + rq->nr_sectors > get_capacity(disk)) {
405 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
406 "Finishing %ld sectors\n",
408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
409 "Retry with 0x%p\n", SCpnt));
415 * quietly refuse to do anything to a changed disc until
416 * the changed bit has been reset
418 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
423 * Some devices (some sdcards for one) don't like it if the
424 * last sector gets read in a larger then 1 sector read.
426 if (unlikely(sdp->last_sector_bug &&
427 rq->nr_sectors > sdp->sector_size / 512 &&
428 block + this_count == get_capacity(disk)))
429 this_count -= sdp->sector_size / 512;
431 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
432 (unsigned long long)block));
435 * If we have a 1K hardware sectorsize, prevent access to single
436 * 512 byte sectors. In theory we could handle this - in fact
437 * the scsi cdrom driver must be able to handle this because
438 * we typically use 1K blocksizes, and cdroms typically have
439 * 2K hardware sectorsizes. Of course, things are simpler
440 * with the cdrom, since it is read-only. For performance
441 * reasons, the filesystems should be able to handle this
442 * and not force the scsi disk driver to use bounce buffers
445 if (sdp->sector_size == 1024) {
446 if ((block & 1) || (rq->nr_sectors & 1)) {
447 scmd_printk(KERN_ERR, SCpnt,
448 "Bad block number requested\n");
452 this_count = this_count >> 1;
455 if (sdp->sector_size == 2048) {
456 if ((block & 3) || (rq->nr_sectors & 3)) {
457 scmd_printk(KERN_ERR, SCpnt,
458 "Bad block number requested\n");
462 this_count = this_count >> 2;
465 if (sdp->sector_size == 4096) {
466 if ((block & 7) || (rq->nr_sectors & 7)) {
467 scmd_printk(KERN_ERR, SCpnt,
468 "Bad block number requested\n");
472 this_count = this_count >> 3;
475 if (rq_data_dir(rq) == WRITE) {
476 if (!sdp->writeable) {
479 SCpnt->cmnd[0] = WRITE_6;
480 SCpnt->sc_data_direction = DMA_TO_DEVICE;
481 } else if (rq_data_dir(rq) == READ) {
482 SCpnt->cmnd[0] = READ_6;
483 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
485 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
489 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
490 "%s %d/%ld 512 byte blocks.\n",
491 (rq_data_dir(rq) == WRITE) ?
492 "writing" : "reading", this_count,
497 if (block > 0xffffffff) {
498 SCpnt->cmnd[0] += READ_16 - READ_6;
499 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
500 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
501 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
502 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
503 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
504 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
505 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
506 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
507 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
508 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
509 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
510 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
511 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
512 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
513 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
514 SCpnt->device->use_10_for_rw) {
515 if (this_count > 0xffff)
518 SCpnt->cmnd[0] += READ_10 - READ_6;
519 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
520 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
521 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
522 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
523 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
524 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
525 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
526 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
528 if (unlikely(blk_fua_rq(rq))) {
530 * This happens only if this drive failed
531 * 10byte rw command with ILLEGAL_REQUEST
532 * during operation and thus turned off
535 scmd_printk(KERN_ERR, SCpnt,
536 "FUA write on READ/WRITE(6) drive\n");
540 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
541 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
542 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
543 SCpnt->cmnd[4] = (unsigned char) this_count;
546 SCpnt->sdb.length = this_count * sdp->sector_size;
549 * We shouldn't disconnect in the middle of a sector, so with a dumb
550 * host adapter, it's safe to assume that we can at least transfer
551 * this many bytes between each connect / disconnect.
553 SCpnt->transfersize = sdp->sector_size;
554 SCpnt->underflow = this_count << 9;
555 SCpnt->allowed = SD_MAX_RETRIES;
556 SCpnt->timeout_per_command = timeout;
559 * This indicates that the command is ready from our end to be
564 return scsi_prep_return(q, rq, ret);
568 * sd_open - open a scsi disk device
569 * @inode: only i_rdev member may be used
570 * @filp: only f_mode and f_flags may be used
572 * Returns 0 if successful. Returns a negated errno value in case
575 * Note: This can be called from a user context (e.g. fsck(1) )
576 * or from within the kernel (e.g. as a result of a mount(1) ).
577 * In the latter case @inode and @filp carry an abridged amount
578 * of information as noted above.
580 static int sd_open(struct inode *inode, struct file *filp)
582 struct gendisk *disk = inode->i_bdev->bd_disk;
583 struct scsi_disk *sdkp;
584 struct scsi_device *sdev;
587 if (!(sdkp = scsi_disk_get(disk)))
591 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
596 * If the device is in error recovery, wait until it is done.
597 * If the device is offline, then disallow any access to it.
600 if (!scsi_block_when_processing_errors(sdev))
603 if (sdev->removable || sdkp->write_prot)
604 check_disk_change(inode->i_bdev);
607 * If the drive is empty, just let the open fail.
610 if (sdev->removable && !sdkp->media_present &&
611 !(filp->f_flags & O_NDELAY))
615 * If the device has the write protect tab set, have the open fail
616 * if the user expects to be able to write to the thing.
619 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
623 * It is possible that the disk changing stuff resulted in
624 * the device being taken offline. If this is the case,
625 * report this to the user, and don't pretend that the
626 * open actually succeeded.
629 if (!scsi_device_online(sdev))
632 if (!sdkp->openers++ && sdev->removable) {
633 if (scsi_block_when_processing_errors(sdev))
634 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
645 * sd_release - invoked when the (last) close(2) is called on this
647 * @inode: only i_rdev member may be used
648 * @filp: only f_mode and f_flags may be used
652 * Note: may block (uninterruptible) if error recovery is underway
655 static int sd_release(struct inode *inode, struct file *filp)
657 struct gendisk *disk = inode->i_bdev->bd_disk;
658 struct scsi_disk *sdkp = scsi_disk(disk);
659 struct scsi_device *sdev = sdkp->device;
661 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
663 if (!--sdkp->openers && sdev->removable) {
664 if (scsi_block_when_processing_errors(sdev))
665 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
669 * XXX and what if there are packets in flight and this close()
670 * XXX is followed by a "rmmod sd_mod"?
676 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
678 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
679 struct scsi_device *sdp = sdkp->device;
680 struct Scsi_Host *host = sdp->host;
683 /* default to most commonly used values */
684 diskinfo[0] = 0x40; /* 1 << 6 */
685 diskinfo[1] = 0x20; /* 1 << 5 */
686 diskinfo[2] = sdkp->capacity >> 11;
688 /* override with calculated, extended default, or driver values */
689 if (host->hostt->bios_param)
690 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
692 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
694 geo->heads = diskinfo[0];
695 geo->sectors = diskinfo[1];
696 geo->cylinders = diskinfo[2];
701 * sd_ioctl - process an ioctl
702 * @inode: only i_rdev/i_bdev members may be used
703 * @filp: only f_mode and f_flags may be used
704 * @cmd: ioctl command number
705 * @arg: this is third argument given to ioctl(2) system call.
706 * Often contains a pointer.
708 * Returns 0 if successful (some ioctls return postive numbers on
709 * success as well). Returns a negated errno value in case of error.
711 * Note: most ioctls are forward onto the block subsystem or further
712 * down in the scsi subsystem.
714 static int sd_ioctl(struct inode * inode, struct file * filp,
715 unsigned int cmd, unsigned long arg)
717 struct block_device *bdev = inode->i_bdev;
718 struct gendisk *disk = bdev->bd_disk;
719 struct scsi_device *sdp = scsi_disk(disk)->device;
720 void __user *p = (void __user *)arg;
723 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
724 disk->disk_name, cmd));
727 * If we are in the middle of error recovery, don't let anyone
728 * else try and use this device. Also, if error recovery fails, it
729 * may try and take the device offline, in which case all further
730 * access to the device is prohibited.
732 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
733 if (!scsi_block_when_processing_errors(sdp) || !error)
737 * Send SCSI addressing ioctls directly to mid level, send other
738 * ioctls to block level and then onto mid level if they can't be
742 case SCSI_IOCTL_GET_IDLUN:
743 case SCSI_IOCTL_GET_BUS_NUMBER:
744 return scsi_ioctl(sdp, cmd, p);
746 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
747 if (error != -ENOTTY)
750 return scsi_ioctl(sdp, cmd, p);
753 static void set_media_not_present(struct scsi_disk *sdkp)
755 sdkp->media_present = 0;
757 sdkp->device->changed = 1;
761 * sd_media_changed - check if our medium changed
762 * @disk: kernel device descriptor
764 * Returns 0 if not applicable or no change; 1 if change
766 * Note: this function is invoked from the block subsystem.
768 static int sd_media_changed(struct gendisk *disk)
770 struct scsi_disk *sdkp = scsi_disk(disk);
771 struct scsi_device *sdp = sdkp->device;
772 struct scsi_sense_hdr *sshdr = NULL;
775 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
781 * If the device is offline, don't send any commands - just pretend as
782 * if the command failed. If the device ever comes back online, we
783 * can deal with it then. It is only because of unrecoverable errors
784 * that we would ever take a device offline in the first place.
786 if (!scsi_device_online(sdp)) {
787 set_media_not_present(sdkp);
793 * Using TEST_UNIT_READY enables differentiation between drive with
794 * no cartridge loaded - NOT READY, drive with changed cartridge -
795 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
797 * Drives that auto spin down. eg iomega jaz 1G, will be started
798 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
799 * sd_revalidate() is called.
803 if (scsi_block_when_processing_errors(sdp)) {
804 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
805 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
810 * Unable to test, unit probably not ready. This usually
811 * means there is no disc in the drive. Mark as changed,
812 * and we will figure it out later once the drive is
815 if (retval || (scsi_sense_valid(sshdr) &&
816 /* 0x3a is medium not present */
817 sshdr->asc == 0x3a)) {
818 set_media_not_present(sdkp);
824 * For removable scsi disk we have to recognise the presence
825 * of a disk in the drive. This is kept in the struct scsi_disk
826 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
828 sdkp->media_present = 1;
830 retval = sdp->changed;
833 if (retval != sdkp->previous_state)
834 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
835 sdkp->previous_state = retval;
840 static int sd_sync_cache(struct scsi_disk *sdkp)
843 struct scsi_device *sdp = sdkp->device;
844 struct scsi_sense_hdr sshdr;
846 if (!scsi_device_online(sdp))
850 for (retries = 3; retries > 0; --retries) {
851 unsigned char cmd[10] = { 0 };
853 cmd[0] = SYNCHRONIZE_CACHE;
855 * Leave the rest of the command zero to indicate
858 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
859 SD_TIMEOUT, SD_MAX_RETRIES);
865 sd_print_result(sdkp, res);
866 if (driver_byte(res) & DRIVER_SENSE)
867 sd_print_sense_hdr(sdkp, &sshdr);
875 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
877 rq->cmd_type = REQ_TYPE_BLOCK_PC;
878 rq->timeout = SD_TIMEOUT;
879 rq->cmd[0] = SYNCHRONIZE_CACHE;
883 static void sd_rescan(struct device *dev)
885 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
888 sd_revalidate_disk(sdkp->disk);
896 * This gets directly called from VFS. When the ioctl
897 * is not recognized we go back to the other translation paths.
899 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
901 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
902 struct gendisk *disk = bdev->bd_disk;
903 struct scsi_device *sdev = scsi_disk(disk)->device;
906 * If we are in the middle of error recovery, don't let anyone
907 * else try and use this device. Also, if error recovery fails, it
908 * may try and take the device offline, in which case all further
909 * access to the device is prohibited.
911 if (!scsi_block_when_processing_errors(sdev))
914 if (sdev->host->hostt->compat_ioctl) {
917 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
923 * Let the static ioctl translation table take care of it.
929 static struct block_device_operations sd_fops = {
930 .owner = THIS_MODULE,
932 .release = sd_release,
936 .compat_ioctl = sd_compat_ioctl,
938 .media_changed = sd_media_changed,
939 .revalidate_disk = sd_revalidate_disk,
943 * sd_done - bottom half handler: called when the lower level
944 * driver has completed (successfully or otherwise) a scsi command.
945 * @SCpnt: mid-level's per command structure.
947 * Note: potentially run from within an ISR. Must not block.
949 static int sd_done(struct scsi_cmnd *SCpnt)
951 int result = SCpnt->result;
952 unsigned int xfer_size = scsi_bufflen(SCpnt);
953 unsigned int good_bytes = result ? 0 : xfer_size;
954 u64 start_lba = SCpnt->request->sector;
955 u64 end_lba = SCpnt->request->sector + (xfer_size / 512);
957 struct scsi_sense_hdr sshdr;
959 int sense_deferred = 0;
963 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
965 sense_deferred = scsi_sense_is_deferred(&sshdr);
967 #ifdef CONFIG_SCSI_LOGGING
968 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
970 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
971 "sd_done: sb[respc,sk,asc,"
972 "ascq]=%x,%x,%x,%x\n",
974 sshdr.sense_key, sshdr.asc,
978 if (driver_byte(result) != DRIVER_SENSE &&
979 (!sense_valid || sense_deferred))
982 switch (sshdr.sense_key) {
985 if (!blk_fs_request(SCpnt->request))
987 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
988 SCSI_SENSE_BUFFERSIZE,
992 if (xfer_size <= SCpnt->device->sector_size)
994 if (SCpnt->device->sector_size < 512) {
995 /* only legitimate sector_size here is 256 */
999 /* be careful ... don't want any overflows */
1000 u64 factor = SCpnt->device->sector_size / 512;
1001 do_div(start_lba, factor);
1002 do_div(end_lba, factor);
1005 if (bad_lba < start_lba || bad_lba >= end_lba)
1006 /* the bad lba was reported incorrectly, we have
1007 * no idea where the error is
1011 /* This computation should always be done in terms of
1012 * the resolution of the device's medium.
1014 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
1016 case RECOVERED_ERROR:
1018 /* Inform the user, but make sure that it's not treated
1021 scsi_print_sense("sd", SCpnt);
1023 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1024 good_bytes = xfer_size;
1026 case ILLEGAL_REQUEST:
1027 if (SCpnt->device->use_10_for_rw &&
1028 (SCpnt->cmnd[0] == READ_10 ||
1029 SCpnt->cmnd[0] == WRITE_10))
1030 SCpnt->device->use_10_for_rw = 0;
1031 if (SCpnt->device->use_10_for_ms &&
1032 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
1033 SCpnt->cmnd[0] == MODE_SELECT_10))
1034 SCpnt->device->use_10_for_ms = 0;
1043 static int media_not_present(struct scsi_disk *sdkp,
1044 struct scsi_sense_hdr *sshdr)
1047 if (!scsi_sense_valid(sshdr))
1049 /* not invoked for commands that could return deferred errors */
1050 if (sshdr->sense_key != NOT_READY &&
1051 sshdr->sense_key != UNIT_ATTENTION)
1053 if (sshdr->asc != 0x3A) /* medium not present */
1056 set_media_not_present(sdkp);
1061 * spinup disk - called only in sd_revalidate_disk()
1064 sd_spinup_disk(struct scsi_disk *sdkp)
1066 unsigned char cmd[10];
1067 unsigned long spintime_expire = 0;
1068 int retries, spintime;
1069 unsigned int the_result;
1070 struct scsi_sense_hdr sshdr;
1071 int sense_valid = 0;
1075 /* Spin up drives, as required. Only do this at boot time */
1076 /* Spinup needs to be done for module loads too. */
1081 cmd[0] = TEST_UNIT_READY;
1082 memset((void *) &cmd[1], 0, 9);
1084 the_result = scsi_execute_req(sdkp->device, cmd,
1090 * If the drive has indicated to us that it
1091 * doesn't have any media in it, don't bother
1092 * with any more polling.
1094 if (media_not_present(sdkp, &sshdr))
1098 sense_valid = scsi_sense_valid(&sshdr);
1100 } while (retries < 3 &&
1101 (!scsi_status_is_good(the_result) ||
1102 ((driver_byte(the_result) & DRIVER_SENSE) &&
1103 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1105 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1106 /* no sense, TUR either succeeded or failed
1107 * with a status error */
1108 if(!spintime && !scsi_status_is_good(the_result)) {
1109 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1110 sd_print_result(sdkp, the_result);
1116 * The device does not want the automatic start to be issued.
1118 if (sdkp->device->no_start_on_add) {
1123 * If manual intervention is required, or this is an
1124 * absent USB storage device, a spinup is meaningless.
1127 sshdr.sense_key == NOT_READY &&
1128 sshdr.asc == 4 && sshdr.ascq == 3) {
1129 break; /* manual intervention required */
1132 * Issue command to spin up drive when not ready
1134 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1136 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1137 cmd[0] = START_STOP;
1138 cmd[1] = 1; /* Return immediately */
1139 memset((void *) &cmd[2], 0, 8);
1140 cmd[4] = 1; /* Start spin cycle */
1141 if (sdkp->device->start_stop_pwr_cond)
1143 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1145 SD_TIMEOUT, SD_MAX_RETRIES);
1146 spintime_expire = jiffies + 100 * HZ;
1149 /* Wait 1 second for next try */
1154 * Wait for USB flash devices with slow firmware.
1155 * Yes, this sense key/ASC combination shouldn't
1156 * occur here. It's characteristic of these devices.
1158 } else if (sense_valid &&
1159 sshdr.sense_key == UNIT_ATTENTION &&
1160 sshdr.asc == 0x28) {
1162 spintime_expire = jiffies + 5 * HZ;
1165 /* Wait 1 second for next try */
1168 /* we don't understand the sense code, so it's
1169 * probably pointless to loop */
1171 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1172 sd_print_sense_hdr(sdkp, &sshdr);
1177 } while (spintime && time_before_eq(jiffies, spintime_expire));
1180 if (scsi_status_is_good(the_result))
1183 printk("not responding...\n");
1189 * Determine whether disk supports Data Integrity Field.
1191 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1193 struct scsi_device *sdp = sdkp->device;
1196 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1199 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1202 case SD_DIF_TYPE0_PROTECTION:
1203 sdkp->protection_type = 0;
1206 case SD_DIF_TYPE1_PROTECTION:
1207 case SD_DIF_TYPE3_PROTECTION:
1208 sdkp->protection_type = type;
1211 case SD_DIF_TYPE2_PROTECTION:
1212 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
1213 "protection which is currently unsupported. " \
1214 "Disabling disk!\n");
1218 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
1219 "protection type %d. Disabling disk!\n", type);
1226 sdkp->protection_type = 0;
1231 * read disk capacity
1234 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1236 unsigned char cmd[16];
1237 int the_result, retries;
1238 int sector_size = 0;
1239 /* Force READ CAPACITY(16) when PROTECT=1 */
1240 int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
1241 struct scsi_sense_hdr sshdr;
1242 int sense_valid = 0;
1243 struct scsi_device *sdp = sdkp->device;
1249 memset((void *) cmd, 0, 16);
1250 cmd[0] = SERVICE_ACTION_IN;
1251 cmd[1] = SAI_READ_CAPACITY_16;
1253 memset((void *) buffer, 0, 13);
1255 cmd[0] = READ_CAPACITY;
1256 memset((void *) &cmd[1], 0, 9);
1257 memset((void *) buffer, 0, 8);
1260 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1261 buffer, longrc ? 13 : 8, &sshdr,
1262 SD_TIMEOUT, SD_MAX_RETRIES);
1264 if (media_not_present(sdkp, &sshdr))
1268 sense_valid = scsi_sense_valid(&sshdr);
1271 } while (the_result && retries);
1273 if (the_result && !longrc) {
1274 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1275 sd_print_result(sdkp, the_result);
1276 if (driver_byte(the_result) & DRIVER_SENSE)
1277 sd_print_sense_hdr(sdkp, &sshdr);
1279 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1281 /* Set dirty bit for removable devices if not ready -
1282 * sometimes drives will not report this properly. */
1283 if (sdp->removable &&
1284 sense_valid && sshdr.sense_key == NOT_READY)
1287 /* Either no media are present but the drive didn't tell us,
1288 or they are present but the read capacity command fails */
1289 /* sdkp->media_present = 0; -- not always correct */
1290 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1293 } else if (the_result && longrc) {
1294 /* READ CAPACITY(16) has been failed */
1295 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1296 sd_print_result(sdkp, the_result);
1297 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1299 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1304 sector_size = (buffer[4] << 24) |
1305 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1306 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1307 buffer[2] == 0xff && buffer[3] == 0xff) {
1308 if(sizeof(sdkp->capacity) > 4) {
1309 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1310 "Trying to use READ CAPACITY(16).\n");
1314 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1315 "a kernel compiled with support for large "
1316 "block devices.\n");
1320 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1325 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1326 ((u64)buffer[1] << 48) |
1327 ((u64)buffer[2] << 40) |
1328 ((u64)buffer[3] << 32) |
1329 ((sector_t)buffer[4] << 24) |
1330 ((sector_t)buffer[5] << 16) |
1331 ((sector_t)buffer[6] << 8) |
1332 (sector_t)buffer[7]);
1334 sector_size = (buffer[8] << 24) |
1335 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1337 sd_read_protection_type(sdkp, buffer);
1340 /* Some devices return the total number of sectors, not the
1341 * highest sector number. Make the necessary adjustment. */
1342 if (sdp->fix_capacity) {
1345 /* Some devices have version which report the correct sizes
1346 * and others which do not. We guess size according to a heuristic
1347 * and err on the side of lowering the capacity. */
1349 if (sdp->guess_capacity)
1350 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1355 if (sector_size == 0) {
1357 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1361 if (sector_size != 512 &&
1362 sector_size != 1024 &&
1363 sector_size != 2048 &&
1364 sector_size != 4096 &&
1365 sector_size != 256) {
1366 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1369 * The user might want to re-format the drive with
1370 * a supported sectorsize. Once this happens, it
1371 * would be relatively trivial to set the thing up.
1372 * For this reason, we leave the thing in the table.
1376 * set a bogus sector size so the normal read/write
1377 * logic in the block layer will eventually refuse any
1378 * request on this device without tripping over power
1379 * of two sector size assumptions
1385 * The msdos fs needs to know the hardware sector size
1386 * So I have created this table. See ll_rw_blk.c
1387 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1389 int hard_sector = sector_size;
1390 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1391 struct request_queue *queue = sdp->request_queue;
1394 blk_queue_hardsect_size(queue, hard_sector);
1395 /* avoid 64-bit division on 32-bit platforms */
1396 sector_div(sz, 625);
1398 sector_div(mb, 1950);
1400 sd_printk(KERN_NOTICE, sdkp,
1401 "%llu %d-byte hardware sectors (%llu MB)\n",
1402 (unsigned long long)sdkp->capacity,
1403 hard_sector, (unsigned long long)mb);
1406 /* Rescale capacity to 512-byte units */
1407 if (sector_size == 4096)
1408 sdkp->capacity <<= 3;
1409 else if (sector_size == 2048)
1410 sdkp->capacity <<= 2;
1411 else if (sector_size == 1024)
1412 sdkp->capacity <<= 1;
1413 else if (sector_size == 256)
1414 sdkp->capacity >>= 1;
1416 sdkp->device->sector_size = sector_size;
1419 /* called with buffer of length 512 */
1421 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1422 unsigned char *buffer, int len, struct scsi_mode_data *data,
1423 struct scsi_sense_hdr *sshdr)
1425 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1426 SD_TIMEOUT, SD_MAX_RETRIES, data,
1431 * read write protect setting, if possible - called only in sd_revalidate_disk()
1432 * called with buffer of length SD_BUF_SIZE
1435 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1438 struct scsi_device *sdp = sdkp->device;
1439 struct scsi_mode_data data;
1441 set_disk_ro(sdkp->disk, 0);
1442 if (sdp->skip_ms_page_3f) {
1443 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1447 if (sdp->use_192_bytes_for_3f) {
1448 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1451 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1452 * We have to start carefully: some devices hang if we ask
1453 * for more than is available.
1455 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1458 * Second attempt: ask for page 0 When only page 0 is
1459 * implemented, a request for page 3F may return Sense Key
1460 * 5: Illegal Request, Sense Code 24: Invalid field in
1463 if (!scsi_status_is_good(res))
1464 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1467 * Third attempt: ask 255 bytes, as we did earlier.
1469 if (!scsi_status_is_good(res))
1470 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1474 if (!scsi_status_is_good(res)) {
1475 sd_printk(KERN_WARNING, sdkp,
1476 "Test WP failed, assume Write Enabled\n");
1478 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1479 set_disk_ro(sdkp->disk, sdkp->write_prot);
1480 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1481 sdkp->write_prot ? "on" : "off");
1482 sd_printk(KERN_DEBUG, sdkp,
1483 "Mode Sense: %02x %02x %02x %02x\n",
1484 buffer[0], buffer[1], buffer[2], buffer[3]);
1489 * sd_read_cache_type - called only from sd_revalidate_disk()
1490 * called with buffer of length SD_BUF_SIZE
1493 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1496 struct scsi_device *sdp = sdkp->device;
1500 struct scsi_mode_data data;
1501 struct scsi_sense_hdr sshdr;
1503 if (sdp->skip_ms_page_8)
1506 if (sdp->type == TYPE_RBC) {
1514 /* cautiously ask */
1515 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1517 if (!scsi_status_is_good(res))
1520 if (!data.header_length) {
1522 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1525 /* that went OK, now ask for the proper length */
1529 * We're only interested in the first three bytes, actually.
1530 * But the data cache page is defined for the first 20.
1537 /* Take headers and block descriptors into account */
1538 len += data.header_length + data.block_descriptor_length;
1539 if (len > SD_BUF_SIZE)
1543 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1545 if (scsi_status_is_good(res)) {
1546 int offset = data.header_length + data.block_descriptor_length;
1548 if (offset >= SD_BUF_SIZE - 2) {
1549 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1553 if ((buffer[offset] & 0x3f) != modepage) {
1554 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1558 if (modepage == 8) {
1559 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1560 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1562 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1566 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1567 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1568 sd_printk(KERN_NOTICE, sdkp,
1569 "Uses READ/WRITE(6), disabling FUA\n");
1573 sd_printk(KERN_NOTICE, sdkp,
1574 "Write cache: %s, read cache: %s, %s\n",
1575 sdkp->WCE ? "enabled" : "disabled",
1576 sdkp->RCD ? "disabled" : "enabled",
1577 sdkp->DPOFUA ? "supports DPO and FUA"
1578 : "doesn't support DPO or FUA");
1584 if (scsi_sense_valid(&sshdr) &&
1585 sshdr.sense_key == ILLEGAL_REQUEST &&
1586 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1587 /* Invalid field in CDB */
1588 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1590 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1593 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1600 * The ATO bit indicates whether the DIF application tag is available
1601 * for use by the operating system.
1603 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1606 struct scsi_device *sdp = sdkp->device;
1607 struct scsi_mode_data data;
1608 struct scsi_sense_hdr sshdr;
1610 if (sdp->type != TYPE_DISK)
1613 if (sdkp->protection_type == 0)
1616 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1617 SD_MAX_RETRIES, &data, &sshdr);
1619 if (!scsi_status_is_good(res) || !data.header_length ||
1621 sd_printk(KERN_WARNING, sdkp,
1622 "getting Control mode page failed, assume no ATO\n");
1624 if (scsi_sense_valid(&sshdr))
1625 sd_print_sense_hdr(sdkp, &sshdr);
1630 offset = data.header_length + data.block_descriptor_length;
1632 if ((buffer[offset] & 0x3f) != 0x0a) {
1633 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1637 if ((buffer[offset + 5] & 0x80) == 0)
1646 * sd_revalidate_disk - called the first time a new disk is seen,
1647 * performs disk spin up, read_capacity, etc.
1648 * @disk: struct gendisk we care about
1650 static int sd_revalidate_disk(struct gendisk *disk)
1652 struct scsi_disk *sdkp = scsi_disk(disk);
1653 struct scsi_device *sdp = sdkp->device;
1654 unsigned char *buffer;
1657 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1658 "sd_revalidate_disk\n"));
1661 * If the device is offline, don't try and read capacity or any
1662 * of the other niceties.
1664 if (!scsi_device_online(sdp))
1667 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1669 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1670 "allocation failure.\n");
1674 /* defaults, until the device tells us otherwise */
1675 sdp->sector_size = 512;
1677 sdkp->media_present = 1;
1678 sdkp->write_prot = 0;
1683 sd_spinup_disk(sdkp);
1686 * Without media there is no reason to ask; moreover, some devices
1687 * react badly if we do.
1689 if (sdkp->media_present) {
1690 sd_read_capacity(sdkp, buffer);
1691 sd_read_write_protect_flag(sdkp, buffer);
1692 sd_read_cache_type(sdkp, buffer);
1693 sd_read_app_tag_own(sdkp, buffer);
1697 * We now have all cache related info, determine how we deal
1698 * with ordered requests. Note that as the current SCSI
1699 * dispatch function can alter request order, we cannot use
1700 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1703 ordered = sdkp->DPOFUA
1704 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1706 ordered = QUEUE_ORDERED_DRAIN;
1708 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1710 set_capacity(disk, sdkp->capacity);
1718 * sd_probe - called during driver initialization and whenever a
1719 * new scsi device is attached to the system. It is called once
1720 * for each scsi device (not just disks) present.
1721 * @dev: pointer to device object
1723 * Returns 0 if successful (or not interested in this scsi device
1724 * (e.g. scanner)); 1 when there is an error.
1726 * Note: this function is invoked from the scsi mid-level.
1727 * This function sets up the mapping between a given
1728 * <host,channel,id,lun> (found in sdp) and new device name
1729 * (e.g. /dev/sda). More precisely it is the block device major
1730 * and minor number that is chosen here.
1732 * Assume sd_attach is not re-entrant (for time being)
1733 * Also think about sd_attach() and sd_remove() running coincidentally.
1735 static int sd_probe(struct device *dev)
1737 struct scsi_device *sdp = to_scsi_device(dev);
1738 struct scsi_disk *sdkp;
1744 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1747 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1751 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1755 gd = alloc_disk(16);
1760 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
1763 error = ida_get_new(&sd_index_ida, &index);
1764 } while (error == -EAGAIN);
1770 if (index >= SD_MAX_DISKS)
1771 goto out_free_index;
1774 sdkp->driver = &sd_template;
1776 sdkp->index = index;
1778 sdkp->previous_state = 1;
1780 if (!sdp->timeout) {
1781 if (sdp->type != TYPE_MOD)
1782 sdp->timeout = SD_TIMEOUT;
1784 sdp->timeout = SD_MOD_TIMEOUT;
1787 device_initialize(&sdkp->dev);
1788 sdkp->dev.parent = &sdp->sdev_gendev;
1789 sdkp->dev.class = &sd_disk_class;
1790 strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1792 if (device_add(&sdkp->dev))
1793 goto out_free_index;
1795 get_device(&sdp->sdev_gendev);
1797 gd->major = sd_major((index & 0xf0) >> 4);
1798 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1800 gd->fops = &sd_fops;
1803 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1804 } else if (index < (26 + 1) * 26) {
1805 sprintf(gd->disk_name, "sd%c%c",
1806 'a' + index / 26 - 1,'a' + index % 26);
1808 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1809 const unsigned int m2 = (index / 26 - 1) % 26;
1810 const unsigned int m3 = index % 26;
1811 sprintf(gd->disk_name, "sd%c%c%c",
1812 'a' + m1, 'a' + m2, 'a' + m3);
1815 gd->private_data = &sdkp->driver;
1816 gd->queue = sdkp->device->request_queue;
1818 sd_revalidate_disk(gd);
1820 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1822 gd->driverfs_dev = &sdp->sdev_gendev;
1823 gd->flags = GENHD_FL_DRIVERFS;
1825 gd->flags |= GENHD_FL_REMOVABLE;
1827 dev_set_drvdata(dev, sdkp);
1830 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1831 sdp->removable ? "removable " : "");
1836 ida_remove(&sd_index_ida, index);
1846 * sd_remove - called whenever a scsi disk (previously recognized by
1847 * sd_probe) is detached from the system. It is called (potentially
1848 * multiple times) during sd module unload.
1849 * @sdp: pointer to mid level scsi device object
1851 * Note: this function is invoked from the scsi mid-level.
1852 * This function potentially frees up a device name (e.g. /dev/sdc)
1853 * that could be re-used by a subsequent sd_probe().
1854 * This function is not called when the built-in sd driver is "exit-ed".
1856 static int sd_remove(struct device *dev)
1858 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1860 device_del(&sdkp->dev);
1861 del_gendisk(sdkp->disk);
1864 mutex_lock(&sd_ref_mutex);
1865 dev_set_drvdata(dev, NULL);
1866 put_device(&sdkp->dev);
1867 mutex_unlock(&sd_ref_mutex);
1873 * scsi_disk_release - Called to free the scsi_disk structure
1874 * @dev: pointer to embedded class device
1876 * sd_ref_mutex must be held entering this routine. Because it is
1877 * called on last put, you should always use the scsi_disk_get()
1878 * scsi_disk_put() helpers which manipulate the semaphore directly
1879 * and never do a direct put_device.
1881 static void scsi_disk_release(struct device *dev)
1883 struct scsi_disk *sdkp = to_scsi_disk(dev);
1884 struct gendisk *disk = sdkp->disk;
1886 ida_remove(&sd_index_ida, sdkp->index);
1888 disk->private_data = NULL;
1890 put_device(&sdkp->device->sdev_gendev);
1895 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1897 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1898 struct scsi_sense_hdr sshdr;
1899 struct scsi_device *sdp = sdkp->device;
1903 cmd[4] |= 1; /* START */
1905 if (sdp->start_stop_pwr_cond)
1906 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
1908 if (!scsi_device_online(sdp))
1911 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1912 SD_TIMEOUT, SD_MAX_RETRIES);
1914 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1915 sd_print_result(sdkp, res);
1916 if (driver_byte(res) & DRIVER_SENSE)
1917 sd_print_sense_hdr(sdkp, &sshdr);
1924 * Send a SYNCHRONIZE CACHE instruction down to the device through
1925 * the normal SCSI command structure. Wait for the command to
1928 static void sd_shutdown(struct device *dev)
1930 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1933 return; /* this can happen */
1936 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1937 sd_sync_cache(sdkp);
1940 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1941 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1942 sd_start_stop_device(sdkp, 0);
1945 scsi_disk_put(sdkp);
1948 static int sd_suspend(struct device *dev, pm_message_t mesg)
1950 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1954 return 0; /* this can happen */
1957 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1958 ret = sd_sync_cache(sdkp);
1963 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
1964 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1965 ret = sd_start_stop_device(sdkp, 0);
1969 scsi_disk_put(sdkp);
1973 static int sd_resume(struct device *dev)
1975 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1978 if (!sdkp->device->manage_start_stop)
1981 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
1982 ret = sd_start_stop_device(sdkp, 1);
1985 scsi_disk_put(sdkp);
1990 * init_sd - entry point for this driver (both when built in or when
1993 * Note: this function registers this driver with the scsi mid-level.
1995 static int __init init_sd(void)
1997 int majors = 0, i, err;
1999 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2001 for (i = 0; i < SD_MAJORS; i++)
2002 if (register_blkdev(sd_major(i), "sd") == 0)
2008 err = class_register(&sd_disk_class);
2012 err = scsi_register_driver(&sd_template.gendrv);
2019 class_unregister(&sd_disk_class);
2021 for (i = 0; i < SD_MAJORS; i++)
2022 unregister_blkdev(sd_major(i), "sd");
2027 * exit_sd - exit point for this driver (when it is a module).
2029 * Note: this function unregisters this driver from the scsi mid-level.
2031 static void __exit exit_sd(void)
2035 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2037 scsi_unregister_driver(&sd_template.gendrv);
2038 class_unregister(&sd_disk_class);
2040 for (i = 0; i < SD_MAJORS; i++)
2041 unregister_blkdev(sd_major(i), "sd");
2044 module_init(init_sd);
2045 module_exit(exit_sd);
2047 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2048 struct scsi_sense_hdr *sshdr)
2050 sd_printk(KERN_INFO, sdkp, "");
2051 scsi_show_sense_hdr(sshdr);
2052 sd_printk(KERN_INFO, sdkp, "");
2053 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2056 static void sd_print_result(struct scsi_disk *sdkp, int result)
2058 sd_printk(KERN_INFO, sdkp, "");
2059 scsi_show_result(result);