blob: 2c6116fd457818a27be8552119425030a6143e68 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
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.
25 *
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.
33 */
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/mm.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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/delay.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010049#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/uaccess.h>
51
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <scsi/scsicam.h>
Martin K. Petersene73aec82007-02-27 22:40:55 -050061#include <scsi/sd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include "scsi_logging.h"
64
Rene Hermanf018fa52006-03-08 00:14:20 -080065MODULE_AUTHOR("Eric Youngdale");
66MODULE_DESCRIPTION("SCSI disk (sd) driver");
67MODULE_LICENSE("GPL");
68
69MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040085MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
86MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
87MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static DEFINE_IDR(sd_index_idr);
90static DEFINE_SPINLOCK(sd_index_lock);
91
92/* This semaphore is used to mediate the 0->1 reference get in the
93 * face of object destruction (i.e. we can't allow a get on an
94 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +010095static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
James Bottomley6bdaa1f2006-03-18 14:14:21 -060097static const char *sd_cache_types[] = {
98 "write through", "none", "write back",
99 "write back, no read (daft)"
100};
101
102static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
103 size_t count)
104{
105 int i, ct = -1, rcd, wce, sp;
106 struct scsi_disk *sdkp = to_scsi_disk(cdev);
107 struct scsi_device *sdp = sdkp->device;
108 char buffer[64];
109 char *buffer_data;
110 struct scsi_mode_data data;
111 struct scsi_sense_hdr sshdr;
112 int len;
113
114 if (sdp->type != TYPE_DISK)
115 /* no cache control on RBC devices; theoretically they
116 * can do it, but there's probably so many exceptions
117 * it's not worth the risk */
118 return -EINVAL;
119
Tobias Klauser6391a112006-06-08 22:23:48 -0700120 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600121 const int len = strlen(sd_cache_types[i]);
122 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
123 buf[len] == '\n') {
124 ct = i;
125 break;
126 }
127 }
128 if (ct < 0)
129 return -EINVAL;
130 rcd = ct & 0x01 ? 1 : 0;
131 wce = ct & 0x02 ? 1 : 0;
132 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
133 SD_MAX_RETRIES, &data, NULL))
134 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800135 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600136 data.block_descriptor_length);
137 buffer_data = buffer + data.header_length +
138 data.block_descriptor_length;
139 buffer_data[2] &= ~0x05;
140 buffer_data[2] |= wce << 2 | rcd;
141 sp = buffer_data[0] & 0x80 ? 1 : 0;
142
143 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
144 SD_MAX_RETRIES, &data, &sshdr)) {
145 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500146 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600147 return -EINVAL;
148 }
149 sd_revalidate_disk(sdkp->disk);
150 return count;
151}
152
Tejun Heoc3c94c52007-03-21 00:13:59 +0900153static ssize_t sd_store_manage_start_stop(struct class_device *cdev,
154 const char *buf, size_t count)
155{
156 struct scsi_disk *sdkp = to_scsi_disk(cdev);
157 struct scsi_device *sdp = sdkp->device;
158
159 if (!capable(CAP_SYS_ADMIN))
160 return -EACCES;
161
162 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
163
164 return count;
165}
166
Brian Kinga144c5a2006-06-27 11:10:31 -0500167static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
168 size_t count)
169{
170 struct scsi_disk *sdkp = to_scsi_disk(cdev);
171 struct scsi_device *sdp = sdkp->device;
172
173 if (!capable(CAP_SYS_ADMIN))
174 return -EACCES;
175
176 if (sdp->type != TYPE_DISK)
177 return -EINVAL;
178
179 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
180
181 return count;
182}
183
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600184static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
185{
186 struct scsi_disk *sdkp = to_scsi_disk(cdev);
187 int ct = sdkp->RCD + 2*sdkp->WCE;
188
189 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
190}
191
192static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
193{
194 struct scsi_disk *sdkp = to_scsi_disk(cdev);
195
196 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
197}
198
Tejun Heoc3c94c52007-03-21 00:13:59 +0900199static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf)
200{
201 struct scsi_disk *sdkp = to_scsi_disk(cdev);
202 struct scsi_device *sdp = sdkp->device;
203
204 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
205}
206
Brian Kinga144c5a2006-06-27 11:10:31 -0500207static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
208{
209 struct scsi_disk *sdkp = to_scsi_disk(cdev);
210
211 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
212}
213
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600214static struct class_device_attribute sd_disk_attrs[] = {
215 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
216 sd_store_cache_type),
217 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
Brian Kinga144c5a2006-06-27 11:10:31 -0500218 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
219 sd_store_allow_restart),
Tejun Heoc3c94c52007-03-21 00:13:59 +0900220 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
221 sd_store_manage_start_stop),
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600222 __ATTR_NULL,
223};
224
225static struct class sd_disk_class = {
226 .name = "scsi_disk",
227 .owner = THIS_MODULE,
228 .release = scsi_disk_release,
229 .class_dev_attrs = sd_disk_attrs,
230};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232static struct scsi_driver sd_template = {
233 .owner = THIS_MODULE,
234 .gendrv = {
235 .name = "sd",
236 .probe = sd_probe,
237 .remove = sd_remove,
Tejun Heoc3c94c52007-03-21 00:13:59 +0900238 .suspend = sd_suspend,
239 .resume = sd_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 .shutdown = sd_shutdown,
241 },
242 .rescan = sd_rescan,
243 .init_command = sd_init_command,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244};
245
246/*
247 * Device no to disk mapping:
248 *
249 * major disc2 disc p1
250 * |............|.............|....|....| <- dev_t
251 * 31 20 19 8 7 4 3 0
252 *
253 * Inside a major, we have 16k disks, however mapped non-
254 * contiguously. The first 16 disks are for major0, the next
255 * ones with major1, ... Disk 256 is for major0 again, disk 272
256 * for major1, ...
257 * As we stay compatible with our numbering scheme, we can reuse
258 * the well-know SCSI majors 8, 65--71, 136--143.
259 */
260static int sd_major(int major_idx)
261{
262 switch (major_idx) {
263 case 0:
264 return SCSI_DISK0_MAJOR;
265 case 1 ... 7:
266 return SCSI_DISK1_MAJOR + major_idx - 1;
267 case 8 ... 15:
268 return SCSI_DISK8_MAJOR + major_idx - 8;
269 default:
270 BUG();
271 return 0; /* shut up gcc */
272 }
273}
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
276{
277 return container_of(disk->private_data, struct scsi_disk, driver);
278}
279
Alan Stern39b7f1e2005-11-04 14:44:41 -0500280static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
282 struct scsi_disk *sdkp = NULL;
283
Alan Stern39b7f1e2005-11-04 14:44:41 -0500284 if (disk->private_data) {
285 sdkp = scsi_disk(disk);
286 if (scsi_device_get(sdkp->device) == 0)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600287 class_device_get(&sdkp->cdev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500288 else
289 sdkp = NULL;
290 }
291 return sdkp;
292}
293
294static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
295{
296 struct scsi_disk *sdkp;
297
Arjan van de Ven0b950672006-01-11 13:16:10 +0100298 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500299 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100300 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500302}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Alan Stern39b7f1e2005-11-04 14:44:41 -0500304static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
305{
306 struct scsi_disk *sdkp;
307
Arjan van de Ven0b950672006-01-11 13:16:10 +0100308 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500309 sdkp = dev_get_drvdata(dev);
310 if (sdkp)
311 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100312 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return sdkp;
314}
315
316static void scsi_disk_put(struct scsi_disk *sdkp)
317{
318 struct scsi_device *sdev = sdkp->device;
319
Arjan van de Ven0b950672006-01-11 13:16:10 +0100320 mutex_lock(&sd_ref_mutex);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600321 class_device_put(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100323 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324}
325
326/**
327 * sd_init_command - build a scsi (read or write) command from
328 * information in the request structure.
329 * @SCpnt: pointer to mid-level's per scsi command structure that
330 * contains request and into which the scsi command is written
331 *
332 * Returns 1 if successful and 0 if error (or cannot be done now).
333 **/
334static int sd_init_command(struct scsi_cmnd * SCpnt)
335{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 struct scsi_device *sdp = SCpnt->device;
337 struct request *rq = SCpnt->request;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100338 struct gendisk *disk = rq->rq_disk;
339 sector_t block = rq->sector;
340 unsigned int this_count = SCpnt->request_bufflen >> 9;
341 unsigned int timeout = sdp->timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500343 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
344 "sd_init_command: block=%llu, "
345 "count=%d\n",
346 (unsigned long long)block,
347 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 if (!sdp || !scsi_device_online(sdp) ||
350 block + rq->nr_sectors > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500351 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
352 "Finishing %ld sectors\n",
353 rq->nr_sectors));
354 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
355 "Retry with 0x%p\n", SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return 0;
357 }
358
359 if (sdp->changed) {
360 /*
361 * quietly refuse to do anything to a changed disc until
362 * the changed bit has been reset
363 */
364 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
365 return 0;
366 }
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500367 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
368 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 /*
371 * If we have a 1K hardware sectorsize, prevent access to single
372 * 512 byte sectors. In theory we could handle this - in fact
373 * the scsi cdrom driver must be able to handle this because
374 * we typically use 1K blocksizes, and cdroms typically have
375 * 2K hardware sectorsizes. Of course, things are simpler
376 * with the cdrom, since it is read-only. For performance
377 * reasons, the filesystems should be able to handle this
378 * and not force the scsi disk driver to use bounce buffers
379 * for this.
380 */
381 if (sdp->sector_size == 1024) {
382 if ((block & 1) || (rq->nr_sectors & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500383 scmd_printk(KERN_ERR, SCpnt,
384 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return 0;
386 } else {
387 block = block >> 1;
388 this_count = this_count >> 1;
389 }
390 }
391 if (sdp->sector_size == 2048) {
392 if ((block & 3) || (rq->nr_sectors & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500393 scmd_printk(KERN_ERR, SCpnt,
394 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return 0;
396 } else {
397 block = block >> 2;
398 this_count = this_count >> 2;
399 }
400 }
401 if (sdp->sector_size == 4096) {
402 if ((block & 7) || (rq->nr_sectors & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500403 scmd_printk(KERN_ERR, SCpnt,
404 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return 0;
406 } else {
407 block = block >> 3;
408 this_count = this_count >> 3;
409 }
410 }
411 if (rq_data_dir(rq) == WRITE) {
412 if (!sdp->writeable) {
413 return 0;
414 }
415 SCpnt->cmnd[0] = WRITE_6;
416 SCpnt->sc_data_direction = DMA_TO_DEVICE;
417 } else if (rq_data_dir(rq) == READ) {
418 SCpnt->cmnd[0] = READ_6;
419 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
420 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500421 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 return 0;
423 }
424
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500425 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
426 "%s %d/%ld 512 byte blocks.\n",
427 (rq_data_dir(rq) == WRITE) ?
428 "writing" : "reading", this_count,
429 rq->nr_sectors));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 SCpnt->cmnd[1] = 0;
432
433 if (block > 0xffffffff) {
434 SCpnt->cmnd[0] += READ_16 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100435 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
437 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
438 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
439 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
440 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
441 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
442 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
443 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
444 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
445 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
446 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
447 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
448 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
449 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
450 SCpnt->device->use_10_for_rw) {
451 if (this_count > 0xffff)
452 this_count = 0xffff;
453
454 SCpnt->cmnd[0] += READ_10 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100455 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
457 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
458 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
459 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
460 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
461 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
462 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
463 } else {
Tejun Heo007365a2006-01-06 09:53:52 +0100464 if (unlikely(blk_fua_rq(rq))) {
465 /*
466 * This happens only if this drive failed
467 * 10byte rw command with ILLEGAL_REQUEST
468 * during operation and thus turned off
469 * use_10_for_rw.
470 */
Martin K. Petersene73aec82007-02-27 22:40:55 -0500471 scmd_printk(KERN_ERR, SCpnt,
472 "FUA write on READ/WRITE(6) drive\n");
Tejun Heo007365a2006-01-06 09:53:52 +0100473 return 0;
474 }
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
477 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
478 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
479 SCpnt->cmnd[4] = (unsigned char) this_count;
480 SCpnt->cmnd[5] = 0;
481 }
Christoph Hellwig631c2282006-07-08 20:42:15 +0200482 SCpnt->request_bufflen = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 /*
485 * We shouldn't disconnect in the middle of a sector, so with a dumb
486 * host adapter, it's safe to assume that we can at least transfer
487 * this many bytes between each connect / disconnect.
488 */
489 SCpnt->transfersize = sdp->sector_size;
490 SCpnt->underflow = this_count << 9;
491 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 SCpnt->timeout_per_command = timeout;
493
494 /*
495 * This is the completion routine we use. This is matched in terms
496 * of capability to this function.
497 */
498 SCpnt->done = sd_rw_intr;
499
500 /*
501 * This indicates that the command is ready from our end to be
502 * queued.
503 */
504 return 1;
505}
506
507/**
508 * sd_open - open a scsi disk device
509 * @inode: only i_rdev member may be used
510 * @filp: only f_mode and f_flags may be used
511 *
512 * Returns 0 if successful. Returns a negated errno value in case
513 * of error.
514 *
515 * Note: This can be called from a user context (e.g. fsck(1) )
516 * or from within the kernel (e.g. as a result of a mount(1) ).
517 * In the latter case @inode and @filp carry an abridged amount
518 * of information as noted above.
519 **/
520static int sd_open(struct inode *inode, struct file *filp)
521{
522 struct gendisk *disk = inode->i_bdev->bd_disk;
523 struct scsi_disk *sdkp;
524 struct scsi_device *sdev;
525 int retval;
526
527 if (!(sdkp = scsi_disk_get(disk)))
528 return -ENXIO;
529
530
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500531 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 sdev = sdkp->device;
534
535 /*
536 * If the device is in error recovery, wait until it is done.
537 * If the device is offline, then disallow any access to it.
538 */
539 retval = -ENXIO;
540 if (!scsi_block_when_processing_errors(sdev))
541 goto error_out;
542
543 if (sdev->removable || sdkp->write_prot)
544 check_disk_change(inode->i_bdev);
545
546 /*
547 * If the drive is empty, just let the open fail.
548 */
549 retval = -ENOMEDIUM;
550 if (sdev->removable && !sdkp->media_present &&
551 !(filp->f_flags & O_NDELAY))
552 goto error_out;
553
554 /*
555 * If the device has the write protect tab set, have the open fail
556 * if the user expects to be able to write to the thing.
557 */
558 retval = -EROFS;
559 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
560 goto error_out;
561
562 /*
563 * It is possible that the disk changing stuff resulted in
564 * the device being taken offline. If this is the case,
565 * report this to the user, and don't pretend that the
566 * open actually succeeded.
567 */
568 retval = -ENXIO;
569 if (!scsi_device_online(sdev))
570 goto error_out;
571
572 if (!sdkp->openers++ && sdev->removable) {
573 if (scsi_block_when_processing_errors(sdev))
574 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
575 }
576
577 return 0;
578
579error_out:
580 scsi_disk_put(sdkp);
581 return retval;
582}
583
584/**
585 * sd_release - invoked when the (last) close(2) is called on this
586 * scsi disk.
587 * @inode: only i_rdev member may be used
588 * @filp: only f_mode and f_flags may be used
589 *
590 * Returns 0.
591 *
592 * Note: may block (uninterruptible) if error recovery is underway
593 * on this disk.
594 **/
595static int sd_release(struct inode *inode, struct file *filp)
596{
597 struct gendisk *disk = inode->i_bdev->bd_disk;
598 struct scsi_disk *sdkp = scsi_disk(disk);
599 struct scsi_device *sdev = sdkp->device;
600
James Bottomley56937f72007-03-11 12:25:33 -0500601 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603 if (!--sdkp->openers && sdev->removable) {
604 if (scsi_block_when_processing_errors(sdev))
605 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
606 }
607
608 /*
609 * XXX and what if there are packets in flight and this close()
610 * XXX is followed by a "rmmod sd_mod"?
611 */
612 scsi_disk_put(sdkp);
613 return 0;
614}
615
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800616static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
618 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
619 struct scsi_device *sdp = sdkp->device;
620 struct Scsi_Host *host = sdp->host;
621 int diskinfo[4];
622
623 /* default to most commonly used values */
624 diskinfo[0] = 0x40; /* 1 << 6 */
625 diskinfo[1] = 0x20; /* 1 << 5 */
626 diskinfo[2] = sdkp->capacity >> 11;
627
628 /* override with calculated, extended default, or driver values */
629 if (host->hostt->bios_param)
630 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
631 else
632 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
633
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800634 geo->heads = diskinfo[0];
635 geo->sectors = diskinfo[1];
636 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 return 0;
638}
639
640/**
641 * sd_ioctl - process an ioctl
642 * @inode: only i_rdev/i_bdev members may be used
643 * @filp: only f_mode and f_flags may be used
644 * @cmd: ioctl command number
645 * @arg: this is third argument given to ioctl(2) system call.
646 * Often contains a pointer.
647 *
648 * Returns 0 if successful (some ioctls return postive numbers on
649 * success as well). Returns a negated errno value in case of error.
650 *
651 * Note: most ioctls are forward onto the block subsystem or further
652 * down in the scsi subsytem.
653 **/
654static int sd_ioctl(struct inode * inode, struct file * filp,
655 unsigned int cmd, unsigned long arg)
656{
657 struct block_device *bdev = inode->i_bdev;
658 struct gendisk *disk = bdev->bd_disk;
659 struct scsi_device *sdp = scsi_disk(disk)->device;
660 void __user *p = (void __user *)arg;
661 int error;
662
663 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
664 disk->disk_name, cmd));
665
666 /*
667 * If we are in the middle of error recovery, don't let anyone
668 * else try and use this device. Also, if error recovery fails, it
669 * may try and take the device offline, in which case all further
670 * access to the device is prohibited.
671 */
672 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
673 if (!scsi_block_when_processing_errors(sdp) || !error)
674 return error;
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 /*
677 * Send SCSI addressing ioctls directly to mid level, send other
678 * ioctls to block level and then onto mid level if they can't be
679 * resolved.
680 */
681 switch (cmd) {
682 case SCSI_IOCTL_GET_IDLUN:
683 case SCSI_IOCTL_GET_BUS_NUMBER:
684 return scsi_ioctl(sdp, cmd, p);
685 default:
FUJITA Tomonori45e79a32007-07-09 12:39:20 +0200686 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 if (error != -ENOTTY)
688 return error;
689 }
690 return scsi_ioctl(sdp, cmd, p);
691}
692
693static void set_media_not_present(struct scsi_disk *sdkp)
694{
695 sdkp->media_present = 0;
696 sdkp->capacity = 0;
697 sdkp->device->changed = 1;
698}
699
700/**
701 * sd_media_changed - check if our medium changed
702 * @disk: kernel device descriptor
703 *
704 * Returns 0 if not applicable or no change; 1 if change
705 *
706 * Note: this function is invoked from the block subsystem.
707 **/
708static int sd_media_changed(struct gendisk *disk)
709{
710 struct scsi_disk *sdkp = scsi_disk(disk);
711 struct scsi_device *sdp = sdkp->device;
712 int retval;
713
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500714 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
716 if (!sdp->removable)
717 return 0;
718
719 /*
720 * If the device is offline, don't send any commands - just pretend as
721 * if the command failed. If the device ever comes back online, we
722 * can deal with it then. It is only because of unrecoverable errors
723 * that we would ever take a device offline in the first place.
724 */
725 if (!scsi_device_online(sdp))
726 goto not_present;
727
728 /*
729 * Using TEST_UNIT_READY enables differentiation between drive with
730 * no cartridge loaded - NOT READY, drive with changed cartridge -
731 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
732 *
733 * Drives that auto spin down. eg iomega jaz 1G, will be started
734 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
735 * sd_revalidate() is called.
736 */
737 retval = -ENODEV;
738 if (scsi_block_when_processing_errors(sdp))
739 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
740
741 /*
742 * Unable to test, unit probably not ready. This usually
743 * means there is no disc in the drive. Mark as changed,
744 * and we will figure it out later once the drive is
745 * available again.
746 */
747 if (retval)
748 goto not_present;
749
750 /*
751 * For removable scsi disk we have to recognise the presence
752 * of a disk in the drive. This is kept in the struct scsi_disk
753 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
754 */
755 sdkp->media_present = 1;
756
757 retval = sdp->changed;
758 sdp->changed = 0;
759
760 return retval;
761
762not_present:
763 set_media_not_present(sdkp);
764 return 1;
765}
766
Martin K. Petersene73aec82007-02-27 22:40:55 -0500767static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -0500770 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -0500771 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
773 if (!scsi_device_online(sdp))
774 return -ENODEV;
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 for (retries = 3; retries > 0; --retries) {
778 unsigned char cmd[10] = { 0 };
779
780 cmd[0] = SYNCHRONIZE_CACHE;
781 /*
782 * Leave the rest of the command zero to indicate
783 * flush everything.
784 */
James Bottomleyea73a9f2005-08-28 11:33:52 -0500785 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
786 SD_TIMEOUT, SD_MAX_RETRIES);
787 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 break;
789 }
790
Martin K. Petersene73aec82007-02-27 22:40:55 -0500791 if (res) {
792 sd_print_result(sdkp, res);
793 if (driver_byte(res) & DRIVER_SENSE)
794 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 }
796
Tejun Heo37210502007-03-21 00:07:18 +0900797 if (res)
798 return -EIO;
799 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
James Bottomley03a57432007-08-03 16:41:11 -0500802static int sd_issue_flush(struct request_queue *q, struct gendisk *disk,
803 sector_t *error_sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500805 int ret = 0;
James Bottomley03a57432007-08-03 16:41:11 -0500806 struct scsi_device *sdp = q->queuedata;
807 struct scsi_disk *sdkp;
808
809 if (sdp->sdev_state != SDEV_RUNNING)
810 return -ENXIO;
811
812 sdkp = scsi_disk_get_from_dev(&sdp->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 if (!sdkp)
815 return -ENODEV;
816
Alan Stern39b7f1e2005-11-04 14:44:41 -0500817 if (sdkp->WCE)
Martin K. Petersene73aec82007-02-27 22:40:55 -0500818 ret = sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500819 scsi_disk_put(sdkp);
820 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821}
822
Jens Axboe165125e2007-07-24 09:28:11 +0200823static void sd_prepare_flush(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500825 memset(rq->cmd, 0, sizeof(rq->cmd));
Jens Axboe4aff5e22006-08-10 08:44:47 +0200826 rq->cmd_type = REQ_TYPE_BLOCK_PC;
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500827 rq->timeout = SD_TIMEOUT;
828 rq->cmd[0] = SYNCHRONIZE_CACHE;
Tejun Heo461d4e92006-01-06 09:52:55 +0100829 rq->cmd_len = 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
832static void sd_rescan(struct device *dev)
833{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500834 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
835
836 if (sdkp) {
837 sd_revalidate_disk(sdkp->disk);
838 scsi_disk_put(sdkp);
839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840}
841
842
843#ifdef CONFIG_COMPAT
844/*
845 * This gets directly called from VFS. When the ioctl
846 * is not recognized we go back to the other translation paths.
847 */
848static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
849{
Josef Sipek7ac62072006-12-08 02:37:37 -0800850 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 struct gendisk *disk = bdev->bd_disk;
852 struct scsi_device *sdev = scsi_disk(disk)->device;
853
854 /*
855 * If we are in the middle of error recovery, don't let anyone
856 * else try and use this device. Also, if error recovery fails, it
857 * may try and take the device offline, in which case all further
858 * access to the device is prohibited.
859 */
860 if (!scsi_block_when_processing_errors(sdev))
861 return -ENODEV;
862
863 if (sdev->host->hostt->compat_ioctl) {
864 int ret;
865
866 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
867
868 return ret;
869 }
870
871 /*
872 * Let the static ioctl translation table take care of it.
873 */
874 return -ENOIOCTLCMD;
875}
876#endif
877
878static struct block_device_operations sd_fops = {
879 .owner = THIS_MODULE,
880 .open = sd_open,
881 .release = sd_release,
882 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800883 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884#ifdef CONFIG_COMPAT
885 .compat_ioctl = sd_compat_ioctl,
886#endif
887 .media_changed = sd_media_changed,
888 .revalidate_disk = sd_revalidate_disk,
889};
890
891/**
892 * sd_rw_intr - bottom half handler: called when the lower level
893 * driver has completed (successfully or otherwise) a scsi command.
894 * @SCpnt: mid-level's per command structure.
895 *
896 * Note: potentially run from within an ISR. Must not block.
897 **/
898static void sd_rw_intr(struct scsi_cmnd * SCpnt)
899{
900 int result = SCpnt->result;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700901 unsigned int xfer_size = SCpnt->request_bufflen;
902 unsigned int good_bytes = result ? 0 : xfer_size;
903 u64 start_lba = SCpnt->request->sector;
904 u64 bad_lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 struct scsi_sense_hdr sshdr;
906 int sense_valid = 0;
907 int sense_deferred = 0;
908 int info_valid;
909
910 if (result) {
911 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
912 if (sense_valid)
913 sense_deferred = scsi_sense_is_deferred(&sshdr);
914 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500916 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500918 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
919 "sd_rw_intr: sb[respc,sk,asc,"
920 "ascq]=%x,%x,%x,%x\n",
921 sshdr.response_code,
922 sshdr.sense_key, sshdr.asc,
923 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 }
925#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700926 if (driver_byte(result) != DRIVER_SENSE &&
927 (!sense_valid || sense_deferred))
928 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700930 switch (sshdr.sense_key) {
931 case HARDWARE_ERROR:
932 case MEDIUM_ERROR:
933 if (!blk_fs_request(SCpnt->request))
934 goto out;
935 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
936 SCSI_SENSE_BUFFERSIZE,
937 &bad_lba);
938 if (!info_valid)
939 goto out;
940 if (xfer_size <= SCpnt->device->sector_size)
941 goto out;
942 switch (SCpnt->device->sector_size) {
943 case 256:
944 start_lba <<= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700946 case 512:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700948 case 1024:
949 start_lba >>= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700951 case 2048:
952 start_lba >>= 2;
953 break;
954 case 4096:
955 start_lba >>= 3;
956 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 default:
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700958 /* Print something here with limiting frequency. */
959 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 break;
961 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700962 /* This computation should always be done in terms of
963 * the resolution of the device's medium.
964 */
965 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
966 break;
967 case RECOVERED_ERROR:
968 case NO_SENSE:
969 /* Inform the user, but make sure that it's not treated
970 * as a hard error.
971 */
972 scsi_print_sense("sd", SCpnt);
973 SCpnt->result = 0;
974 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
975 good_bytes = xfer_size;
976 break;
977 case ILLEGAL_REQUEST:
978 if (SCpnt->device->use_10_for_rw &&
979 (SCpnt->cmnd[0] == READ_10 ||
980 SCpnt->cmnd[0] == WRITE_10))
981 SCpnt->device->use_10_for_rw = 0;
982 if (SCpnt->device->use_10_for_ms &&
983 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
984 SCpnt->cmnd[0] == MODE_SELECT_10))
985 SCpnt->device->use_10_for_ms = 0;
986 break;
987 default:
988 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700990 out:
991 scsi_io_completion(SCpnt, good_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992}
993
James Bottomleyea73a9f2005-08-28 11:33:52 -0500994static int media_not_present(struct scsi_disk *sdkp,
995 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
James Bottomleyea73a9f2005-08-28 11:33:52 -0500998 if (!scsi_sense_valid(sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 return 0;
1000 /* not invoked for commands that could return deferred errors */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001001 if (sshdr->sense_key != NOT_READY &&
1002 sshdr->sense_key != UNIT_ATTENTION)
1003 return 0;
1004 if (sshdr->asc != 0x3A) /* medium not present */
1005 return 0;
1006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 set_media_not_present(sdkp);
1008 return 1;
1009}
1010
1011/*
1012 * spinup disk - called only in sd_revalidate_disk()
1013 */
1014static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001015sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001016{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001018 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 int retries, spintime;
1020 unsigned int the_result;
1021 struct scsi_sense_hdr sshdr;
1022 int sense_valid = 0;
1023
1024 spintime = 0;
1025
1026 /* Spin up drives, as required. Only do this at boot time */
1027 /* Spinup needs to be done for module loads too. */
1028 do {
1029 retries = 0;
1030
1031 do {
1032 cmd[0] = TEST_UNIT_READY;
1033 memset((void *) &cmd[1], 0, 9);
1034
James Bottomleyea73a9f2005-08-28 11:33:52 -05001035 the_result = scsi_execute_req(sdkp->device, cmd,
1036 DMA_NONE, NULL, 0,
1037 &sshdr, SD_TIMEOUT,
1038 SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
Alan Sternb4d38e32006-10-11 16:48:28 -04001040 /*
1041 * If the drive has indicated to us that it
1042 * doesn't have any media in it, don't bother
1043 * with any more polling.
1044 */
1045 if (media_not_present(sdkp, &sshdr))
1046 return;
1047
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001049 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 retries++;
1051 } while (retries < 3 &&
1052 (!scsi_status_is_good(the_result) ||
1053 ((driver_byte(the_result) & DRIVER_SENSE) &&
1054 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1057 /* no sense, TUR either succeeded or failed
1058 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001059 if(!spintime && !scsi_status_is_good(the_result)) {
1060 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1061 sd_print_result(sdkp, the_result);
1062 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 break;
1064 }
1065
1066 /*
1067 * The device does not want the automatic start to be issued.
1068 */
1069 if (sdkp->device->no_start_on_add) {
1070 break;
1071 }
1072
1073 /*
1074 * If manual intervention is required, or this is an
1075 * absent USB storage device, a spinup is meaningless.
1076 */
1077 if (sense_valid &&
1078 sshdr.sense_key == NOT_READY &&
1079 sshdr.asc == 4 && sshdr.ascq == 3) {
1080 break; /* manual intervention required */
1081
1082 /*
1083 * Issue command to spin up drive when not ready
1084 */
1085 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1086 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001087 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 cmd[0] = START_STOP;
1089 cmd[1] = 1; /* Return immediately */
1090 memset((void *) &cmd[2], 0, 8);
1091 cmd[4] = 1; /* Start spin cycle */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001092 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1093 NULL, 0, &sshdr,
1094 SD_TIMEOUT, SD_MAX_RETRIES);
Alan Stern4451e472005-07-12 10:45:17 -04001095 spintime_expire = jiffies + 100 * HZ;
1096 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 /* Wait 1 second for next try */
1099 msleep(1000);
1100 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001101
1102 /*
1103 * Wait for USB flash devices with slow firmware.
1104 * Yes, this sense key/ASC combination shouldn't
1105 * occur here. It's characteristic of these devices.
1106 */
1107 } else if (sense_valid &&
1108 sshdr.sense_key == UNIT_ATTENTION &&
1109 sshdr.asc == 0x28) {
1110 if (!spintime) {
1111 spintime_expire = jiffies + 5 * HZ;
1112 spintime = 1;
1113 }
1114 /* Wait 1 second for next try */
1115 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 } else {
1117 /* we don't understand the sense code, so it's
1118 * probably pointless to loop */
1119 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001120 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1121 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 }
1123 break;
1124 }
1125
Alan Stern4451e472005-07-12 10:45:17 -04001126 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
1128 if (spintime) {
1129 if (scsi_status_is_good(the_result))
1130 printk("ready\n");
1131 else
1132 printk("not responding...\n");
1133 }
1134}
1135
1136/*
1137 * read disk capacity
1138 */
1139static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001140sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001141{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 int the_result, retries;
1144 int sector_size = 0;
1145 int longrc = 0;
1146 struct scsi_sense_hdr sshdr;
1147 int sense_valid = 0;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001148 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
1150repeat:
1151 retries = 3;
1152 do {
1153 if (longrc) {
1154 memset((void *) cmd, 0, 16);
1155 cmd[0] = SERVICE_ACTION_IN;
1156 cmd[1] = SAI_READ_CAPACITY_16;
1157 cmd[13] = 12;
1158 memset((void *) buffer, 0, 12);
1159 } else {
1160 cmd[0] = READ_CAPACITY;
1161 memset((void *) &cmd[1], 0, 9);
1162 memset((void *) buffer, 0, 8);
1163 }
1164
James Bottomleyea73a9f2005-08-28 11:33:52 -05001165 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1166 buffer, longrc ? 12 : 8, &sshdr,
1167 SD_TIMEOUT, SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
James Bottomleyea73a9f2005-08-28 11:33:52 -05001169 if (media_not_present(sdkp, &sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return;
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001173 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 retries--;
1175
1176 } while (the_result && retries);
1177
1178 if (the_result && !longrc) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001179 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1180 sd_print_result(sdkp, the_result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 if (driver_byte(the_result) & DRIVER_SENSE)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001182 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001184 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
1186 /* Set dirty bit for removable devices if not ready -
1187 * sometimes drives will not report this properly. */
1188 if (sdp->removable &&
1189 sense_valid && sshdr.sense_key == NOT_READY)
1190 sdp->changed = 1;
1191
1192 /* Either no media are present but the drive didn't tell us,
1193 or they are present but the read capacity command fails */
1194 /* sdkp->media_present = 0; -- not always correct */
Hannes Reinecke69bdd882006-09-01 15:50:23 +02001195 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196
1197 return;
1198 } else if (the_result && longrc) {
1199 /* READ CAPACITY(16) has been failed */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001200 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1201 sd_print_result(sdkp, the_result);
1202 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1203
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1205 goto got_data;
1206 }
1207
1208 if (!longrc) {
1209 sector_size = (buffer[4] << 24) |
1210 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1211 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1212 buffer[2] == 0xff && buffer[3] == 0xff) {
1213 if(sizeof(sdkp->capacity) > 4) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001214 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1215 "Trying to use READ CAPACITY(16).\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 longrc = 1;
1217 goto repeat;
1218 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001219 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1220 "a kernel compiled with support for large "
1221 "block devices.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 sdkp->capacity = 0;
1223 goto got_data;
1224 }
1225 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1226 (buffer[1] << 16) |
1227 (buffer[2] << 8) |
1228 buffer[3]);
1229 } else {
1230 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1231 ((u64)buffer[1] << 48) |
1232 ((u64)buffer[2] << 40) |
1233 ((u64)buffer[3] << 32) |
1234 ((sector_t)buffer[4] << 24) |
1235 ((sector_t)buffer[5] << 16) |
1236 ((sector_t)buffer[6] << 8) |
1237 (sector_t)buffer[7]);
1238
1239 sector_size = (buffer[8] << 24) |
1240 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1241 }
1242
1243 /* Some devices return the total number of sectors, not the
1244 * highest sector number. Make the necessary adjustment. */
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001245 if (sdp->fix_capacity) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 --sdkp->capacity;
1247
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001248 /* Some devices have version which report the correct sizes
1249 * and others which do not. We guess size according to a heuristic
1250 * and err on the side of lowering the capacity. */
1251 } else {
1252 if (sdp->guess_capacity)
1253 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1254 --sdkp->capacity;
1255 }
1256
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257got_data:
1258 if (sector_size == 0) {
1259 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001260 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1261 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 }
1263
1264 if (sector_size != 512 &&
1265 sector_size != 1024 &&
1266 sector_size != 2048 &&
1267 sector_size != 4096 &&
1268 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001269 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1270 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 /*
1272 * The user might want to re-format the drive with
1273 * a supported sectorsize. Once this happens, it
1274 * would be relatively trivial to set the thing up.
1275 * For this reason, we leave the thing in the table.
1276 */
1277 sdkp->capacity = 0;
1278 /*
1279 * set a bogus sector size so the normal read/write
1280 * logic in the block layer will eventually refuse any
1281 * request on this device without tripping over power
1282 * of two sector size assumptions
1283 */
1284 sector_size = 512;
1285 }
1286 {
1287 /*
1288 * The msdos fs needs to know the hardware sector size
1289 * So I have created this table. See ll_rw_blk.c
1290 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1291 */
1292 int hard_sector = sector_size;
James Bottomley7a691bd2005-10-28 13:17:30 -05001293 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
Jens Axboe165125e2007-07-24 09:28:11 +02001294 struct request_queue *queue = sdp->request_queue;
James Bottomley7a691bd2005-10-28 13:17:30 -05001295 sector_t mb = sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
1297 blk_queue_hardsect_size(queue, hard_sector);
1298 /* avoid 64-bit division on 32-bit platforms */
James Bottomley7a691bd2005-10-28 13:17:30 -05001299 sector_div(sz, 625);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 mb -= sz - 974;
1301 sector_div(mb, 1950);
1302
Martin K. Petersene73aec82007-02-27 22:40:55 -05001303 sd_printk(KERN_NOTICE, sdkp,
1304 "%llu %d-byte hardware sectors (%llu MB)\n",
1305 (unsigned long long)sdkp->capacity,
1306 hard_sector, (unsigned long long)mb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 }
1308
1309 /* Rescale capacity to 512-byte units */
1310 if (sector_size == 4096)
1311 sdkp->capacity <<= 3;
1312 else if (sector_size == 2048)
1313 sdkp->capacity <<= 2;
1314 else if (sector_size == 1024)
1315 sdkp->capacity <<= 1;
1316 else if (sector_size == 256)
1317 sdkp->capacity >>= 1;
1318
1319 sdkp->device->sector_size = sector_size;
1320}
1321
1322/* called with buffer of length 512 */
1323static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001324sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1325 unsigned char *buffer, int len, struct scsi_mode_data *data,
1326 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001328 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001329 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001330 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
1332
1333/*
1334 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001335 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 */
1337static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001338sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001339{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001341 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 struct scsi_mode_data data;
1343
1344 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001345 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001346 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 return;
1348 }
1349
James Bottomleyea73a9f2005-08-28 11:33:52 -05001350 if (sdp->use_192_bytes_for_3f) {
1351 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 } else {
1353 /*
1354 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1355 * We have to start carefully: some devices hang if we ask
1356 * for more than is available.
1357 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001358 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360 /*
1361 * Second attempt: ask for page 0 When only page 0 is
1362 * implemented, a request for page 3F may return Sense Key
1363 * 5: Illegal Request, Sense Code 24: Invalid field in
1364 * CDB.
1365 */
1366 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001367 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /*
1370 * Third attempt: ask 255 bytes, as we did earlier.
1371 */
1372 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001373 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1374 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 }
1376
1377 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001378 sd_printk(KERN_WARNING, sdkp,
1379 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 } else {
1381 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1382 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersene73aec82007-02-27 22:40:55 -05001383 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1384 sdkp->write_prot ? "on" : "off");
1385 sd_printk(KERN_DEBUG, sdkp,
1386 "Mode Sense: %02x %02x %02x %02x\n",
1387 buffer[0], buffer[1], buffer[2], buffer[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 }
1389}
1390
1391/*
1392 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001393 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 */
1395static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001396sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01001397{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001399 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
Al Viro 631e8a12005-05-16 01:59:55 +01001401 int dbd;
1402 int modepage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 struct scsi_mode_data data;
1404 struct scsi_sense_hdr sshdr;
1405
James Bottomleyea73a9f2005-08-28 11:33:52 -05001406 if (sdp->skip_ms_page_8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 goto defaults;
1408
James Bottomleyea73a9f2005-08-28 11:33:52 -05001409 if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01001410 modepage = 6;
1411 dbd = 8;
1412 } else {
1413 modepage = 8;
1414 dbd = 0;
1415 }
1416
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 /* cautiously ask */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001418 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
1420 if (!scsi_status_is_good(res))
1421 goto bad_sense;
1422
Al Viro6d73c852006-02-23 02:03:16 +01001423 if (!data.header_length) {
1424 modepage = 6;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001425 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01001426 }
1427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 /* that went OK, now ask for the proper length */
1429 len = data.length;
1430
1431 /*
1432 * We're only interested in the first three bytes, actually.
1433 * But the data cache page is defined for the first 20.
1434 */
1435 if (len < 3)
1436 goto bad_sense;
1437 if (len > 20)
1438 len = 20;
1439
1440 /* Take headers and block descriptors into account */
1441 len += data.header_length + data.block_descriptor_length;
Al Viro48970802006-02-26 08:34:10 -06001442 if (len > SD_BUF_SIZE)
1443 goto bad_sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
1445 /* Get the data */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001446 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01001449 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
Al Viro48970802006-02-26 08:34:10 -06001451 if (offset >= SD_BUF_SIZE - 2) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001452 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
Al Viro48970802006-02-26 08:34:10 -06001453 goto defaults;
1454 }
1455
Al Viro 631e8a12005-05-16 01:59:55 +01001456 if ((buffer[offset] & 0x3f) != modepage) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001457 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
Al Viro 631e8a12005-05-16 01:59:55 +01001458 goto defaults;
1459 }
1460
1461 if (modepage == 8) {
1462 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1463 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1464 } else {
1465 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1466 sdkp->RCD = 0;
1467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
Tejun Heo007365a2006-01-06 09:53:52 +01001469 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1470 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001471 sd_printk(KERN_NOTICE, sdkp,
1472 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01001473 sdkp->DPOFUA = 0;
1474 }
1475
Martin K. Petersene73aec82007-02-27 22:40:55 -05001476 sd_printk(KERN_NOTICE, sdkp,
1477 "Write cache: %s, read cache: %s, %s\n",
Luben Tuikovfd44bab2006-11-15 12:47:08 -08001478 sdkp->WCE ? "enabled" : "disabled",
1479 sdkp->RCD ? "disabled" : "enabled",
1480 sdkp->DPOFUA ? "supports DPO and FUA"
1481 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482
1483 return;
1484 }
1485
1486bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05001487 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 sshdr.sense_key == ILLEGAL_REQUEST &&
1489 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001490 /* Invalid field in CDB */
1491 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001493 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494
1495defaults:
Martin K. Petersene73aec82007-02-27 22:40:55 -05001496 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 sdkp->WCE = 0;
1498 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06001499 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500}
1501
1502/**
1503 * sd_revalidate_disk - called the first time a new disk is seen,
1504 * performs disk spin up, read_capacity, etc.
1505 * @disk: struct gendisk we care about
1506 **/
1507static int sd_revalidate_disk(struct gendisk *disk)
1508{
1509 struct scsi_disk *sdkp = scsi_disk(disk);
1510 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 unsigned char *buffer;
Tejun Heo461d4e92006-01-06 09:52:55 +01001512 unsigned ordered;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001514 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1515 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
1517 /*
1518 * If the device is offline, don't try and read capacity or any
1519 * of the other niceties.
1520 */
1521 if (!scsi_device_online(sdp))
1522 goto out;
1523
Bernhard Wallea6123f12007-05-21 17:15:26 +02001524 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001526 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1527 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05001528 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 }
1530
1531 /* defaults, until the device tells us otherwise */
1532 sdp->sector_size = 512;
1533 sdkp->capacity = 0;
1534 sdkp->media_present = 1;
1535 sdkp->write_prot = 0;
1536 sdkp->WCE = 0;
1537 sdkp->RCD = 0;
1538
Martin K. Petersene73aec82007-02-27 22:40:55 -05001539 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540
1541 /*
1542 * Without media there is no reason to ask; moreover, some devices
1543 * react badly if we do.
1544 */
1545 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001546 sd_read_capacity(sdkp, buffer);
1547 sd_read_write_protect_flag(sdkp, buffer);
1548 sd_read_cache_type(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 }
Tejun Heo461d4e92006-01-06 09:52:55 +01001550
1551 /*
1552 * We now have all cache related info, determine how we deal
1553 * with ordered requests. Note that as the current SCSI
1554 * dispatch function can alter request order, we cannot use
1555 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1556 */
1557 if (sdkp->WCE)
Tejun Heo007365a2006-01-06 09:53:52 +01001558 ordered = sdkp->DPOFUA
1559 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
Tejun Heo461d4e92006-01-06 09:52:55 +01001560 else
1561 ordered = QUEUE_ORDERED_DRAIN;
1562
1563 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1564
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 set_capacity(disk, sdkp->capacity);
1566 kfree(buffer);
1567
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 out:
1569 return 0;
1570}
1571
1572/**
1573 * sd_probe - called during driver initialization and whenever a
1574 * new scsi device is attached to the system. It is called once
1575 * for each scsi device (not just disks) present.
1576 * @dev: pointer to device object
1577 *
1578 * Returns 0 if successful (or not interested in this scsi device
1579 * (e.g. scanner)); 1 when there is an error.
1580 *
1581 * Note: this function is invoked from the scsi mid-level.
1582 * This function sets up the mapping between a given
1583 * <host,channel,id,lun> (found in sdp) and new device name
1584 * (e.g. /dev/sda). More precisely it is the block device major
1585 * and minor number that is chosen here.
1586 *
1587 * Assume sd_attach is not re-entrant (for time being)
1588 * Also think about sd_attach() and sd_remove() running coincidentally.
1589 **/
1590static int sd_probe(struct device *dev)
1591{
1592 struct scsi_device *sdp = to_scsi_device(dev);
1593 struct scsi_disk *sdkp;
1594 struct gendisk *gd;
1595 u32 index;
1596 int error;
1597
1598 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01001599 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 goto out;
1601
James Bottomley9ccfc752005-10-02 11:45:08 -05001602 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1603 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
1605 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05001606 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 if (!sdkp)
1608 goto out;
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 gd = alloc_disk(16);
1611 if (!gd)
1612 goto out_free;
1613
1614 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1615 goto out_put;
1616
1617 spin_lock(&sd_index_lock);
1618 error = idr_get_new(&sd_index_idr, NULL, &index);
1619 spin_unlock(&sd_index_lock);
1620
1621 if (index >= SD_MAX_DISKS)
1622 error = -EBUSY;
1623 if (error)
1624 goto out_put;
1625
1626 sdkp->device = sdp;
1627 sdkp->driver = &sd_template;
1628 sdkp->disk = gd;
1629 sdkp->index = index;
1630 sdkp->openers = 0;
1631
1632 if (!sdp->timeout) {
Al Viro 631e8a12005-05-16 01:59:55 +01001633 if (sdp->type != TYPE_MOD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 sdp->timeout = SD_TIMEOUT;
1635 else
1636 sdp->timeout = SD_MOD_TIMEOUT;
1637 }
1638
Nagendra Singh Tomar017f2e32007-02-02 17:34:56 +05301639 class_device_initialize(&sdkp->cdev);
1640 sdkp->cdev.dev = &sdp->sdev_gendev;
1641 sdkp->cdev.class = &sd_disk_class;
1642 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1643
1644 if (class_device_add(&sdkp->cdev))
1645 goto out_put;
1646
1647 get_device(&sdp->sdev_gendev);
1648
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 gd->major = sd_major((index & 0xf0) >> 4);
1650 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1651 gd->minors = 16;
1652 gd->fops = &sd_fops;
1653
1654 if (index < 26) {
1655 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1656 } else if (index < (26 + 1) * 26) {
1657 sprintf(gd->disk_name, "sd%c%c",
1658 'a' + index / 26 - 1,'a' + index % 26);
1659 } else {
1660 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1661 const unsigned int m2 = (index / 26 - 1) % 26;
1662 const unsigned int m3 = index % 26;
1663 sprintf(gd->disk_name, "sd%c%c%c",
1664 'a' + m1, 'a' + m2, 'a' + m3);
1665 }
1666
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 gd->private_data = &sdkp->driver;
Tejun Heo461d4e92006-01-06 09:52:55 +01001668 gd->queue = sdkp->device->request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669
1670 sd_revalidate_disk(gd);
1671
James Bottomley03a57432007-08-03 16:41:11 -05001672 blk_queue_issue_flush_fn(sdp->request_queue, sd_issue_flush);
1673
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 gd->driverfs_dev = &sdp->sdev_gendev;
1675 gd->flags = GENHD_FL_DRIVERFS;
1676 if (sdp->removable)
1677 gd->flags |= GENHD_FL_REMOVABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679 dev_set_drvdata(dev, sdkp);
1680 add_disk(gd);
1681
Martin K. Petersene73aec82007-02-27 22:40:55 -05001682 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1683 sdp->removable ? "removable " : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684
1685 return 0;
1686
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001687 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001689 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001691 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 return error;
1693}
1694
1695/**
1696 * sd_remove - called whenever a scsi disk (previously recognized by
1697 * sd_probe) is detached from the system. It is called (potentially
1698 * multiple times) during sd module unload.
1699 * @sdp: pointer to mid level scsi device object
1700 *
1701 * Note: this function is invoked from the scsi mid-level.
1702 * This function potentially frees up a device name (e.g. /dev/sdc)
1703 * that could be re-used by a subsequent sd_probe().
1704 * This function is not called when the built-in sd driver is "exit-ed".
1705 **/
1706static int sd_remove(struct device *dev)
1707{
1708 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1709
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001710 class_device_del(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 del_gendisk(sdkp->disk);
1712 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001713
Arjan van de Ven0b950672006-01-11 13:16:10 +01001714 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001715 dev_set_drvdata(dev, NULL);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001716 class_device_put(&sdkp->cdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001717 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718
1719 return 0;
1720}
1721
1722/**
1723 * scsi_disk_release - Called to free the scsi_disk structure
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001724 * @cdev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01001726 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 * called on last put, you should always use the scsi_disk_get()
1728 * scsi_disk_put() helpers which manipulate the semaphore directly
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001729 * and never do a direct class_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 **/
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001731static void scsi_disk_release(struct class_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732{
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001733 struct scsi_disk *sdkp = to_scsi_disk(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 struct gendisk *disk = sdkp->disk;
1735
1736 spin_lock(&sd_index_lock);
1737 idr_remove(&sd_index_idr, sdkp->index);
1738 spin_unlock(&sd_index_lock);
1739
1740 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001742 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
1744 kfree(sdkp);
1745}
1746
James Bottomleycc5d2c82007-03-20 12:26:03 -05001747static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09001748{
1749 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1750 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05001751 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001752 int res;
1753
1754 if (start)
1755 cmd[4] |= 1; /* START */
1756
1757 if (!scsi_device_online(sdp))
1758 return -ENODEV;
1759
1760 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1761 SD_TIMEOUT, SD_MAX_RETRIES);
1762 if (res) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05001763 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1764 sd_print_result(sdkp, res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09001765 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05001766 sd_print_sense_hdr(sdkp, &sshdr);
Tejun Heoc3c94c52007-03-21 00:13:59 +09001767 }
1768
1769 return res;
1770}
1771
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772/*
1773 * Send a SYNCHRONIZE CACHE instruction down to the device through
1774 * the normal SCSI command structure. Wait for the command to
1775 * complete.
1776 */
1777static void sd_shutdown(struct device *dev)
1778{
Alan Stern39b7f1e2005-11-04 14:44:41 -05001779 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780
1781 if (!sdkp)
1782 return; /* this can happen */
1783
Alan Stern39b7f1e2005-11-04 14:44:41 -05001784 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001785 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1786 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001787 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09001788
James Bottomleycc5d2c82007-03-20 12:26:03 -05001789 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1790 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1791 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09001792 }
1793
Alan Stern39b7f1e2005-11-04 14:44:41 -05001794 scsi_disk_put(sdkp);
1795}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796
Tejun Heoc3c94c52007-03-21 00:13:59 +09001797static int sd_suspend(struct device *dev, pm_message_t mesg)
1798{
Tejun Heoc3c94c52007-03-21 00:13:59 +09001799 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04001800 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001801
1802 if (!sdkp)
1803 return 0; /* this can happen */
1804
1805 if (sdkp->WCE) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05001806 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09001807 ret = sd_sync_cache(sdkp);
1808 if (ret)
Alan Stern09ff92f2007-05-21 09:55:04 -04001809 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001810 }
1811
James Bottomleycc5d2c82007-03-20 12:26:03 -05001812 if (mesg.event == PM_EVENT_SUSPEND &&
1813 sdkp->device->manage_start_stop) {
1814 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1815 ret = sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09001816 }
1817
Alan Stern09ff92f2007-05-21 09:55:04 -04001818done:
1819 scsi_disk_put(sdkp);
1820 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001821}
1822
1823static int sd_resume(struct device *dev)
1824{
Tejun Heoc3c94c52007-03-21 00:13:59 +09001825 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04001826 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001827
James Bottomleycc5d2c82007-03-20 12:26:03 -05001828 if (!sdkp->device->manage_start_stop)
Alan Stern09ff92f2007-05-21 09:55:04 -04001829 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001830
James Bottomleycc5d2c82007-03-20 12:26:03 -05001831 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Alan Stern09ff92f2007-05-21 09:55:04 -04001832 ret = sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09001833
Alan Stern09ff92f2007-05-21 09:55:04 -04001834done:
1835 scsi_disk_put(sdkp);
1836 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09001837}
1838
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839/**
1840 * init_sd - entry point for this driver (both when built in or when
1841 * a module).
1842 *
1843 * Note: this function registers this driver with the scsi mid-level.
1844 **/
1845static int __init init_sd(void)
1846{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001847 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848
1849 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1850
1851 for (i = 0; i < SD_MAJORS; i++)
1852 if (register_blkdev(sd_major(i), "sd") == 0)
1853 majors++;
1854
1855 if (!majors)
1856 return -ENODEV;
1857
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001858 err = class_register(&sd_disk_class);
1859 if (err)
1860 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001861
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001862 err = scsi_register_driver(&sd_template.gendrv);
1863 if (err)
1864 goto err_out_class;
1865
1866 return 0;
1867
1868err_out_class:
1869 class_unregister(&sd_disk_class);
1870err_out:
1871 for (i = 0; i < SD_MAJORS; i++)
1872 unregister_blkdev(sd_major(i), "sd");
1873 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874}
1875
1876/**
1877 * exit_sd - exit point for this driver (when it is a module).
1878 *
1879 * Note: this function unregisters this driver from the scsi mid-level.
1880 **/
1881static void __exit exit_sd(void)
1882{
1883 int i;
1884
1885 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1886
1887 scsi_unregister_driver(&sd_template.gendrv);
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001888 class_unregister(&sd_disk_class);
1889
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 for (i = 0; i < SD_MAJORS; i++)
1891 unregister_blkdev(sd_major(i), "sd");
1892}
1893
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894module_init(init_sd);
1895module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05001896
1897static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1898 struct scsi_sense_hdr *sshdr)
1899{
1900 sd_printk(KERN_INFO, sdkp, "");
1901 scsi_show_sense_hdr(sshdr);
1902 sd_printk(KERN_INFO, sdkp, "");
1903 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1904}
1905
1906static void sd_print_result(struct scsi_disk *sdkp, int result)
1907{
1908 sd_printk(KERN_INFO, sdkp, "");
1909 scsi_show_result(result);
1910}
1911