blob: c647d85d97d14555fc93f02d28ed98d580ff3be3 [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
35#include <linux/config.h>
36#include <linux/module.h>
37#include <linux/fs.h>
38#include <linux/kernel.h>
39#include <linux/sched.h>
40#include <linux/mm.h>
41#include <linux/bio.h>
42#include <linux/genhd.h>
43#include <linux/hdreg.h>
44#include <linux/errno.h>
45#include <linux/idr.h>
46#include <linux/interrupt.h>
47#include <linux/init.h>
48#include <linux/blkdev.h>
49#include <linux/blkpg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/delay.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010051#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <asm/uaccess.h>
53
54#include <scsi/scsi.h>
55#include <scsi/scsi_cmnd.h>
56#include <scsi/scsi_dbg.h>
57#include <scsi/scsi_device.h>
58#include <scsi/scsi_driver.h>
59#include <scsi/scsi_eh.h>
60#include <scsi/scsi_host.h>
61#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <scsi/scsicam.h>
63
64#include "scsi_logging.h"
65
66/*
67 * More than enough for everybody ;) The huge number of majors
68 * is a leftover from 16bit dev_t days, we don't really need that
69 * much numberspace.
70 */
71#define SD_MAJORS 16
72
Rene Hermanf018fa52006-03-08 00:14:20 -080073MODULE_AUTHOR("Eric Youngdale");
74MODULE_DESCRIPTION("SCSI disk (sd) driver");
75MODULE_LICENSE("GPL");
76
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/*
95 * This is limited by the naming scheme enforced in sd_probe,
96 * add another character to it if you really need more disks.
97 */
98#define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
99
100/*
101 * Time out in seconds for disks and Magneto-opticals (which are slower).
102 */
103#define SD_TIMEOUT (30 * HZ)
104#define SD_MOD_TIMEOUT (75 * HZ)
105
106/*
107 * Number of allowed retries
108 */
109#define SD_MAX_RETRIES 5
110#define SD_PASSTHROUGH_RETRIES 1
111
Al Viro48970802006-02-26 08:34:10 -0600112/*
113 * Size of the initial data buffer for mode and read capacity data
114 */
115#define SD_BUF_SIZE 512
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117struct scsi_disk {
118 struct scsi_driver *driver; /* always &sd_template */
119 struct scsi_device *device;
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600120 struct class_device cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 struct gendisk *disk;
122 unsigned int openers; /* protected by BKL for now, yuck */
123 sector_t capacity; /* size in 512-byte sectors */
124 u32 index;
125 u8 media_present;
126 u8 write_prot;
127 unsigned WCE : 1; /* state of disk WCE bit */
128 unsigned RCD : 1; /* state of disk RCD bit, unused */
Tejun Heo007365a2006-01-06 09:53:52 +0100129 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130};
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600131#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133static DEFINE_IDR(sd_index_idr);
134static DEFINE_SPINLOCK(sd_index_lock);
135
136/* This semaphore is used to mediate the 0->1 reference get in the
137 * face of object destruction (i.e. we can't allow a get on an
138 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100139static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141static int sd_revalidate_disk(struct gendisk *disk);
142static void sd_rw_intr(struct scsi_cmnd * SCpnt);
143
144static int sd_probe(struct device *);
145static int sd_remove(struct device *);
146static void sd_shutdown(struct device *dev);
147static void sd_rescan(struct device *);
148static int sd_init_command(struct scsi_cmnd *);
149static int sd_issue_flush(struct device *, sector_t *);
Tejun Heo461d4e92006-01-06 09:52:55 +0100150static void sd_prepare_flush(request_queue_t *, struct request *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500152 unsigned char *buffer);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600153static void scsi_disk_release(struct class_device *cdev);
154
155static const char *sd_cache_types[] = {
156 "write through", "none", "write back",
157 "write back, no read (daft)"
158};
159
160static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
161 size_t count)
162{
163 int i, ct = -1, rcd, wce, sp;
164 struct scsi_disk *sdkp = to_scsi_disk(cdev);
165 struct scsi_device *sdp = sdkp->device;
166 char buffer[64];
167 char *buffer_data;
168 struct scsi_mode_data data;
169 struct scsi_sense_hdr sshdr;
170 int len;
171
172 if (sdp->type != TYPE_DISK)
173 /* no cache control on RBC devices; theoretically they
174 * can do it, but there's probably so many exceptions
175 * it's not worth the risk */
176 return -EINVAL;
177
178 for (i = 0; i < sizeof(sd_cache_types)/sizeof(sd_cache_types[0]); i++) {
179 const int len = strlen(sd_cache_types[i]);
180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
181 buf[len] == '\n') {
182 ct = i;
183 break;
184 }
185 }
186 if (ct < 0)
187 return -EINVAL;
188 rcd = ct & 0x01 ? 1 : 0;
189 wce = ct & 0x02 ? 1 : 0;
190 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
191 SD_MAX_RETRIES, &data, NULL))
192 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800193 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600194 data.block_descriptor_length);
195 buffer_data = buffer + data.header_length +
196 data.block_descriptor_length;
197 buffer_data[2] &= ~0x05;
198 buffer_data[2] |= wce << 2 | rcd;
199 sp = buffer_data[0] & 0x80 ? 1 : 0;
200
201 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
202 SD_MAX_RETRIES, &data, &sshdr)) {
203 if (scsi_sense_valid(&sshdr))
204 scsi_print_sense_hdr(sdkp->disk->disk_name, &sshdr);
205 return -EINVAL;
206 }
207 sd_revalidate_disk(sdkp->disk);
208 return count;
209}
210
211static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
212{
213 struct scsi_disk *sdkp = to_scsi_disk(cdev);
214 int ct = sdkp->RCD + 2*sdkp->WCE;
215
216 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
217}
218
219static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
220{
221 struct scsi_disk *sdkp = to_scsi_disk(cdev);
222
223 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
224}
225
226static struct class_device_attribute sd_disk_attrs[] = {
227 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
228 sd_store_cache_type),
229 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
230 __ATTR_NULL,
231};
232
233static struct class sd_disk_class = {
234 .name = "scsi_disk",
235 .owner = THIS_MODULE,
236 .release = scsi_disk_release,
237 .class_dev_attrs = sd_disk_attrs,
238};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240static struct scsi_driver sd_template = {
241 .owner = THIS_MODULE,
242 .gendrv = {
243 .name = "sd",
244 .probe = sd_probe,
245 .remove = sd_remove,
246 .shutdown = sd_shutdown,
247 },
248 .rescan = sd_rescan,
249 .init_command = sd_init_command,
250 .issue_flush = sd_issue_flush,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251};
252
253/*
254 * Device no to disk mapping:
255 *
256 * major disc2 disc p1
257 * |............|.............|....|....| <- dev_t
258 * 31 20 19 8 7 4 3 0
259 *
260 * Inside a major, we have 16k disks, however mapped non-
261 * contiguously. The first 16 disks are for major0, the next
262 * ones with major1, ... Disk 256 is for major0 again, disk 272
263 * for major1, ...
264 * As we stay compatible with our numbering scheme, we can reuse
265 * the well-know SCSI majors 8, 65--71, 136--143.
266 */
267static int sd_major(int major_idx)
268{
269 switch (major_idx) {
270 case 0:
271 return SCSI_DISK0_MAJOR;
272 case 1 ... 7:
273 return SCSI_DISK1_MAJOR + major_idx - 1;
274 case 8 ... 15:
275 return SCSI_DISK8_MAJOR + major_idx - 8;
276 default:
277 BUG();
278 return 0; /* shut up gcc */
279 }
280}
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
283{
284 return container_of(disk->private_data, struct scsi_disk, driver);
285}
286
Alan Stern39b7f1e2005-11-04 14:44:41 -0500287static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 struct scsi_disk *sdkp = NULL;
290
Alan Stern39b7f1e2005-11-04 14:44:41 -0500291 if (disk->private_data) {
292 sdkp = scsi_disk(disk);
293 if (scsi_device_get(sdkp->device) == 0)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600294 class_device_get(&sdkp->cdev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500295 else
296 sdkp = NULL;
297 }
298 return sdkp;
299}
300
301static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
302{
303 struct scsi_disk *sdkp;
304
Arjan van de Ven0b950672006-01-11 13:16:10 +0100305 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500306 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100307 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500309}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Alan Stern39b7f1e2005-11-04 14:44:41 -0500311static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
312{
313 struct scsi_disk *sdkp;
314
Arjan van de Ven0b950672006-01-11 13:16:10 +0100315 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500316 sdkp = dev_get_drvdata(dev);
317 if (sdkp)
318 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100319 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return sdkp;
321}
322
323static void scsi_disk_put(struct scsi_disk *sdkp)
324{
325 struct scsi_device *sdev = sdkp->device;
326
Arjan van de Ven0b950672006-01-11 13:16:10 +0100327 mutex_lock(&sd_ref_mutex);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600328 class_device_put(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100330 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
333/**
334 * sd_init_command - build a scsi (read or write) command from
335 * information in the request structure.
336 * @SCpnt: pointer to mid-level's per scsi command structure that
337 * contains request and into which the scsi command is written
338 *
339 * Returns 1 if successful and 0 if error (or cannot be done now).
340 **/
341static int sd_init_command(struct scsi_cmnd * SCpnt)
342{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 struct scsi_device *sdp = SCpnt->device;
344 struct request *rq = SCpnt->request;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100345 struct gendisk *disk = rq->rq_disk;
346 sector_t block = rq->sector;
347 unsigned int this_count = SCpnt->request_bufflen >> 9;
348 unsigned int timeout = sdp->timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, "
351 "count=%d\n", disk->disk_name,
352 (unsigned long long)block, this_count));
353
354 if (!sdp || !scsi_device_online(sdp) ||
355 block + rq->nr_sectors > get_capacity(disk)) {
356 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
357 rq->nr_sectors));
358 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
359 return 0;
360 }
361
362 if (sdp->changed) {
363 /*
364 * quietly refuse to do anything to a changed disc until
365 * the changed bit has been reset
366 */
367 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
368 return 0;
369 }
370 SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n",
371 disk->disk_name, (unsigned long long)block));
372
373 /*
374 * If we have a 1K hardware sectorsize, prevent access to single
375 * 512 byte sectors. In theory we could handle this - in fact
376 * the scsi cdrom driver must be able to handle this because
377 * we typically use 1K blocksizes, and cdroms typically have
378 * 2K hardware sectorsizes. Of course, things are simpler
379 * with the cdrom, since it is read-only. For performance
380 * reasons, the filesystems should be able to handle this
381 * and not force the scsi disk driver to use bounce buffers
382 * for this.
383 */
384 if (sdp->sector_size == 1024) {
385 if ((block & 1) || (rq->nr_sectors & 1)) {
386 printk(KERN_ERR "sd: Bad block number requested");
387 return 0;
388 } else {
389 block = block >> 1;
390 this_count = this_count >> 1;
391 }
392 }
393 if (sdp->sector_size == 2048) {
394 if ((block & 3) || (rq->nr_sectors & 3)) {
395 printk(KERN_ERR "sd: Bad block number requested");
396 return 0;
397 } else {
398 block = block >> 2;
399 this_count = this_count >> 2;
400 }
401 }
402 if (sdp->sector_size == 4096) {
403 if ((block & 7) || (rq->nr_sectors & 7)) {
404 printk(KERN_ERR "sd: Bad block number requested");
405 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 {
421 printk(KERN_ERR "sd: Unknown command %lx\n", rq->flags);
422/* overkill panic("Unknown sd command %lx\n", rq->flags); */
423 return 0;
424 }
425
426 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
427 disk->disk_name, (rq_data_dir(rq) == WRITE) ?
428 "writing" : "reading", this_count, rq->nr_sectors));
429
430 SCpnt->cmnd[1] = 0;
431
432 if (block > 0xffffffff) {
433 SCpnt->cmnd[0] += READ_16 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100434 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
436 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
437 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
438 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
439 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
440 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
441 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
442 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
443 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
444 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
445 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
446 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
447 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
448 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
449 SCpnt->device->use_10_for_rw) {
450 if (this_count > 0xffff)
451 this_count = 0xffff;
452
453 SCpnt->cmnd[0] += READ_10 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100454 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
456 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
457 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
458 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
459 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
460 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
461 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
462 } else {
Tejun Heo007365a2006-01-06 09:53:52 +0100463 if (unlikely(blk_fua_rq(rq))) {
464 /*
465 * This happens only if this drive failed
466 * 10byte rw command with ILLEGAL_REQUEST
467 * during operation and thus turned off
468 * use_10_for_rw.
469 */
470 printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n");
471 return 0;
472 }
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
475 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
476 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
477 SCpnt->cmnd[4] = (unsigned char) this_count;
478 SCpnt->cmnd[5] = 0;
479 }
480 SCpnt->request_bufflen = SCpnt->bufflen =
481 this_count * sdp->sector_size;
482
483 /*
484 * We shouldn't disconnect in the middle of a sector, so with a dumb
485 * host adapter, it's safe to assume that we can at least transfer
486 * this many bytes between each connect / disconnect.
487 */
488 SCpnt->transfersize = sdp->sector_size;
489 SCpnt->underflow = this_count << 9;
490 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 SCpnt->timeout_per_command = timeout;
492
493 /*
494 * This is the completion routine we use. This is matched in terms
495 * of capability to this function.
496 */
497 SCpnt->done = sd_rw_intr;
498
499 /*
500 * This indicates that the command is ready from our end to be
501 * queued.
502 */
503 return 1;
504}
505
506/**
507 * sd_open - open a scsi disk device
508 * @inode: only i_rdev member may be used
509 * @filp: only f_mode and f_flags may be used
510 *
511 * Returns 0 if successful. Returns a negated errno value in case
512 * of error.
513 *
514 * Note: This can be called from a user context (e.g. fsck(1) )
515 * or from within the kernel (e.g. as a result of a mount(1) ).
516 * In the latter case @inode and @filp carry an abridged amount
517 * of information as noted above.
518 **/
519static int sd_open(struct inode *inode, struct file *filp)
520{
521 struct gendisk *disk = inode->i_bdev->bd_disk;
522 struct scsi_disk *sdkp;
523 struct scsi_device *sdev;
524 int retval;
525
526 if (!(sdkp = scsi_disk_get(disk)))
527 return -ENXIO;
528
529
530 SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name));
531
532 sdev = sdkp->device;
533
534 /*
535 * If the device is in error recovery, wait until it is done.
536 * If the device is offline, then disallow any access to it.
537 */
538 retval = -ENXIO;
539 if (!scsi_block_when_processing_errors(sdev))
540 goto error_out;
541
542 if (sdev->removable || sdkp->write_prot)
543 check_disk_change(inode->i_bdev);
544
545 /*
546 * If the drive is empty, just let the open fail.
547 */
548 retval = -ENOMEDIUM;
549 if (sdev->removable && !sdkp->media_present &&
550 !(filp->f_flags & O_NDELAY))
551 goto error_out;
552
553 /*
554 * If the device has the write protect tab set, have the open fail
555 * if the user expects to be able to write to the thing.
556 */
557 retval = -EROFS;
558 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
559 goto error_out;
560
561 /*
562 * It is possible that the disk changing stuff resulted in
563 * the device being taken offline. If this is the case,
564 * report this to the user, and don't pretend that the
565 * open actually succeeded.
566 */
567 retval = -ENXIO;
568 if (!scsi_device_online(sdev))
569 goto error_out;
570
571 if (!sdkp->openers++ && sdev->removable) {
572 if (scsi_block_when_processing_errors(sdev))
573 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
574 }
575
576 return 0;
577
578error_out:
579 scsi_disk_put(sdkp);
580 return retval;
581}
582
583/**
584 * sd_release - invoked when the (last) close(2) is called on this
585 * scsi disk.
586 * @inode: only i_rdev member may be used
587 * @filp: only f_mode and f_flags may be used
588 *
589 * Returns 0.
590 *
591 * Note: may block (uninterruptible) if error recovery is underway
592 * on this disk.
593 **/
594static int sd_release(struct inode *inode, struct file *filp)
595{
596 struct gendisk *disk = inode->i_bdev->bd_disk;
597 struct scsi_disk *sdkp = scsi_disk(disk);
598 struct scsi_device *sdev = sdkp->device;
599
600 SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name));
601
602 if (!--sdkp->openers && sdev->removable) {
603 if (scsi_block_when_processing_errors(sdev))
604 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
605 }
606
607 /*
608 * XXX and what if there are packets in flight and this close()
609 * XXX is followed by a "rmmod sd_mod"?
610 */
611 scsi_disk_put(sdkp);
612 return 0;
613}
614
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800615static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
617 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
618 struct scsi_device *sdp = sdkp->device;
619 struct Scsi_Host *host = sdp->host;
620 int diskinfo[4];
621
622 /* default to most commonly used values */
623 diskinfo[0] = 0x40; /* 1 << 6 */
624 diskinfo[1] = 0x20; /* 1 << 5 */
625 diskinfo[2] = sdkp->capacity >> 11;
626
627 /* override with calculated, extended default, or driver values */
628 if (host->hostt->bios_param)
629 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
630 else
631 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
632
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800633 geo->heads = diskinfo[0];
634 geo->sectors = diskinfo[1];
635 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 return 0;
637}
638
639/**
640 * sd_ioctl - process an ioctl
641 * @inode: only i_rdev/i_bdev members may be used
642 * @filp: only f_mode and f_flags may be used
643 * @cmd: ioctl command number
644 * @arg: this is third argument given to ioctl(2) system call.
645 * Often contains a pointer.
646 *
647 * Returns 0 if successful (some ioctls return postive numbers on
648 * success as well). Returns a negated errno value in case of error.
649 *
650 * Note: most ioctls are forward onto the block subsystem or further
651 * down in the scsi subsytem.
652 **/
653static int sd_ioctl(struct inode * inode, struct file * filp,
654 unsigned int cmd, unsigned long arg)
655{
656 struct block_device *bdev = inode->i_bdev;
657 struct gendisk *disk = bdev->bd_disk;
658 struct scsi_device *sdp = scsi_disk(disk)->device;
659 void __user *p = (void __user *)arg;
660 int error;
661
662 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
663 disk->disk_name, cmd));
664
665 /*
666 * If we are in the middle of error recovery, don't let anyone
667 * else try and use this device. Also, if error recovery fails, it
668 * may try and take the device offline, in which case all further
669 * access to the device is prohibited.
670 */
671 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
672 if (!scsi_block_when_processing_errors(sdp) || !error)
673 return error;
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 /*
676 * Send SCSI addressing ioctls directly to mid level, send other
677 * ioctls to block level and then onto mid level if they can't be
678 * resolved.
679 */
680 switch (cmd) {
681 case SCSI_IOCTL_GET_IDLUN:
682 case SCSI_IOCTL_GET_BUS_NUMBER:
683 return scsi_ioctl(sdp, cmd, p);
684 default:
685 error = scsi_cmd_ioctl(filp, disk, cmd, p);
686 if (error != -ENOTTY)
687 return error;
688 }
689 return scsi_ioctl(sdp, cmd, p);
690}
691
692static void set_media_not_present(struct scsi_disk *sdkp)
693{
694 sdkp->media_present = 0;
695 sdkp->capacity = 0;
696 sdkp->device->changed = 1;
697}
698
699/**
700 * sd_media_changed - check if our medium changed
701 * @disk: kernel device descriptor
702 *
703 * Returns 0 if not applicable or no change; 1 if change
704 *
705 * Note: this function is invoked from the block subsystem.
706 **/
707static int sd_media_changed(struct gendisk *disk)
708{
709 struct scsi_disk *sdkp = scsi_disk(disk);
710 struct scsi_device *sdp = sdkp->device;
711 int retval;
712
713 SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n",
714 disk->disk_name));
715
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
767static int sd_sync_cache(struct scsi_device *sdp)
768{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 int retries, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -0500770 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 if (!scsi_device_online(sdp))
773 return -ENODEV;
774
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 for (retries = 3; retries > 0; --retries) {
777 unsigned char cmd[10] = { 0 };
778
779 cmd[0] = SYNCHRONIZE_CACHE;
780 /*
781 * Leave the rest of the command zero to indicate
782 * flush everything.
783 */
James Bottomleyea73a9f2005-08-28 11:33:52 -0500784 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
785 SD_TIMEOUT, SD_MAX_RETRIES);
786 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 break;
788 }
789
James Bottomleyea73a9f2005-08-28 11:33:52 -0500790 if (res) { printk(KERN_WARNING "FAILED\n status = %x, message = %02x, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 "host = %d, driver = %02x\n ",
792 status_byte(res), msg_byte(res),
793 host_byte(res), driver_byte(res));
794 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleyea73a9f2005-08-28 11:33:52 -0500795 scsi_print_sense_hdr("sd", &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 return res;
799}
800
801static int sd_issue_flush(struct device *dev, sector_t *error_sector)
802{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500803 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 struct scsi_device *sdp = to_scsi_device(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500805 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 if (!sdkp)
808 return -ENODEV;
809
Alan Stern39b7f1e2005-11-04 14:44:41 -0500810 if (sdkp->WCE)
811 ret = sd_sync_cache(sdp);
812 scsi_disk_put(sdkp);
813 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
Tejun Heo461d4e92006-01-06 09:52:55 +0100816static void sd_prepare_flush(request_queue_t *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817{
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500818 memset(rq->cmd, 0, sizeof(rq->cmd));
Tejun Heo461d4e92006-01-06 09:52:55 +0100819 rq->flags |= REQ_BLOCK_PC;
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500820 rq->timeout = SD_TIMEOUT;
821 rq->cmd[0] = SYNCHRONIZE_CACHE;
Tejun Heo461d4e92006-01-06 09:52:55 +0100822 rq->cmd_len = 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823}
824
825static void sd_rescan(struct device *dev)
826{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500827 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
828
829 if (sdkp) {
830 sd_revalidate_disk(sdkp->disk);
831 scsi_disk_put(sdkp);
832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833}
834
835
836#ifdef CONFIG_COMPAT
837/*
838 * This gets directly called from VFS. When the ioctl
839 * is not recognized we go back to the other translation paths.
840 */
841static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
842{
843 struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
844 struct gendisk *disk = bdev->bd_disk;
845 struct scsi_device *sdev = scsi_disk(disk)->device;
846
847 /*
848 * If we are in the middle of error recovery, don't let anyone
849 * else try and use this device. Also, if error recovery fails, it
850 * may try and take the device offline, in which case all further
851 * access to the device is prohibited.
852 */
853 if (!scsi_block_when_processing_errors(sdev))
854 return -ENODEV;
855
856 if (sdev->host->hostt->compat_ioctl) {
857 int ret;
858
859 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
860
861 return ret;
862 }
863
864 /*
865 * Let the static ioctl translation table take care of it.
866 */
867 return -ENOIOCTLCMD;
868}
869#endif
870
871static struct block_device_operations sd_fops = {
872 .owner = THIS_MODULE,
873 .open = sd_open,
874 .release = sd_release,
875 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800876 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877#ifdef CONFIG_COMPAT
878 .compat_ioctl = sd_compat_ioctl,
879#endif
880 .media_changed = sd_media_changed,
881 .revalidate_disk = sd_revalidate_disk,
882};
883
884/**
885 * sd_rw_intr - bottom half handler: called when the lower level
886 * driver has completed (successfully or otherwise) a scsi command.
887 * @SCpnt: mid-level's per command structure.
888 *
889 * Note: potentially run from within an ISR. Must not block.
890 **/
891static void sd_rw_intr(struct scsi_cmnd * SCpnt)
892{
893 int result = SCpnt->result;
894 int this_count = SCpnt->bufflen;
895 int good_bytes = (result == 0 ? this_count : 0);
896 sector_t block_sectors = 1;
897 u64 first_err_block;
898 sector_t error_sector;
899 struct scsi_sense_hdr sshdr;
900 int sense_valid = 0;
901 int sense_deferred = 0;
902 int info_valid;
903
904 if (result) {
905 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
906 if (sense_valid)
907 sense_deferred = scsi_sense_is_deferred(&sshdr);
908 }
909
910#ifdef CONFIG_SCSI_LOGGING
911 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n",
912 SCpnt->request->rq_disk->disk_name, result));
913 if (sense_valid) {
914 SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc,"
915 "ascq]=%x,%x,%x,%x\n", sshdr.response_code,
916 sshdr.sense_key, sshdr.asc, sshdr.ascq));
917 }
918#endif
919 /*
920 Handle MEDIUM ERRORs that indicate partial success. Since this is a
921 relatively rare error condition, no care is taken to avoid
922 unnecessary additional work such as memcpy's that could be avoided.
923 */
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100924 if (driver_byte(result) != 0 &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 sense_valid && !sense_deferred) {
926 switch (sshdr.sense_key) {
927 case MEDIUM_ERROR:
928 if (!blk_fs_request(SCpnt->request))
929 break;
930 info_valid = scsi_get_sense_info_fld(
931 SCpnt->sense_buffer, SCSI_SENSE_BUFFERSIZE,
932 &first_err_block);
933 /*
934 * May want to warn and skip if following cast results
935 * in actual truncation (if sector_t < 64 bits)
936 */
937 error_sector = (sector_t)first_err_block;
938 if (SCpnt->request->bio != NULL)
939 block_sectors = bio_sectors(SCpnt->request->bio);
940 switch (SCpnt->device->sector_size) {
941 case 1024:
942 error_sector <<= 1;
943 if (block_sectors < 2)
944 block_sectors = 2;
945 break;
946 case 2048:
947 error_sector <<= 2;
948 if (block_sectors < 4)
949 block_sectors = 4;
950 break;
951 case 4096:
952 error_sector <<=3;
953 if (block_sectors < 8)
954 block_sectors = 8;
955 break;
956 case 256:
957 error_sector >>= 1;
958 break;
959 default:
960 break;
961 }
962
963 error_sector &= ~(block_sectors - 1);
964 good_bytes = (error_sector - SCpnt->request->sector) << 9;
965 if (good_bytes < 0 || good_bytes >= this_count)
966 good_bytes = 0;
967 break;
968
969 case RECOVERED_ERROR: /* an error occurred, but it recovered */
970 case NO_SENSE: /* LLDD got sense data */
971 /*
972 * Inform the user, but make sure that it's not treated
973 * as a hard error.
974 */
975 scsi_print_sense("sd", SCpnt);
976 SCpnt->result = 0;
977 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
978 good_bytes = this_count;
979 break;
980
981 case ILLEGAL_REQUEST:
982 if (SCpnt->device->use_10_for_rw &&
983 (SCpnt->cmnd[0] == READ_10 ||
984 SCpnt->cmnd[0] == WRITE_10))
985 SCpnt->device->use_10_for_rw = 0;
986 if (SCpnt->device->use_10_for_ms &&
987 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
988 SCpnt->cmnd[0] == MODE_SELECT_10))
989 SCpnt->device->use_10_for_ms = 0;
990 break;
991
992 default:
993 break;
994 }
995 }
996 /*
997 * This calls the generic completion function, now that we know
998 * how many actual sectors finished, and how many sectors we need
999 * to say have failed.
1000 */
1001 scsi_io_completion(SCpnt, good_bytes, block_sectors << 9);
1002}
1003
James Bottomleyea73a9f2005-08-28 11:33:52 -05001004static int media_not_present(struct scsi_disk *sdkp,
1005 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
James Bottomleyea73a9f2005-08-28 11:33:52 -05001008 if (!scsi_sense_valid(sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 return 0;
1010 /* not invoked for commands that could return deferred errors */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001011 if (sshdr->sense_key != NOT_READY &&
1012 sshdr->sense_key != UNIT_ATTENTION)
1013 return 0;
1014 if (sshdr->asc != 0x3A) /* medium not present */
1015 return 0;
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 set_media_not_present(sdkp);
1018 return 1;
1019}
1020
1021/*
1022 * spinup disk - called only in sd_revalidate_disk()
1023 */
1024static void
James Bottomleyea73a9f2005-08-28 11:33:52 -05001025sd_spinup_disk(struct scsi_disk *sdkp, char *diskname)
1026{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001028 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 int retries, spintime;
1030 unsigned int the_result;
1031 struct scsi_sense_hdr sshdr;
1032 int sense_valid = 0;
1033
1034 spintime = 0;
1035
1036 /* Spin up drives, as required. Only do this at boot time */
1037 /* Spinup needs to be done for module loads too. */
1038 do {
1039 retries = 0;
1040
1041 do {
1042 cmd[0] = TEST_UNIT_READY;
1043 memset((void *) &cmd[1], 0, 9);
1044
James Bottomleyea73a9f2005-08-28 11:33:52 -05001045 the_result = scsi_execute_req(sdkp->device, cmd,
1046 DMA_NONE, NULL, 0,
1047 &sshdr, SD_TIMEOUT,
1048 SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001051 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 retries++;
1053 } while (retries < 3 &&
1054 (!scsi_status_is_good(the_result) ||
1055 ((driver_byte(the_result) & DRIVER_SENSE) &&
1056 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1057
1058 /*
1059 * If the drive has indicated to us that it doesn't have
1060 * any media in it, don't bother with any of the rest of
1061 * this crap.
1062 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001063 if (media_not_present(sdkp, &sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return;
1065
1066 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1067 /* no sense, TUR either succeeded or failed
1068 * with a status error */
1069 if(!spintime && !scsi_status_is_good(the_result))
1070 printk(KERN_NOTICE "%s: Unit Not Ready, "
1071 "error = 0x%x\n", diskname, the_result);
1072 break;
1073 }
1074
1075 /*
1076 * The device does not want the automatic start to be issued.
1077 */
1078 if (sdkp->device->no_start_on_add) {
1079 break;
1080 }
1081
1082 /*
1083 * If manual intervention is required, or this is an
1084 * absent USB storage device, a spinup is meaningless.
1085 */
1086 if (sense_valid &&
1087 sshdr.sense_key == NOT_READY &&
1088 sshdr.asc == 4 && sshdr.ascq == 3) {
1089 break; /* manual intervention required */
1090
1091 /*
1092 * Issue command to spin up drive when not ready
1093 */
1094 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1095 if (!spintime) {
1096 printk(KERN_NOTICE "%s: Spinning up disk...",
1097 diskname);
1098 cmd[0] = START_STOP;
1099 cmd[1] = 1; /* Return immediately */
1100 memset((void *) &cmd[2], 0, 8);
1101 cmd[4] = 1; /* Start spin cycle */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001102 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1103 NULL, 0, &sshdr,
1104 SD_TIMEOUT, SD_MAX_RETRIES);
Alan Stern4451e472005-07-12 10:45:17 -04001105 spintime_expire = jiffies + 100 * HZ;
1106 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /* Wait 1 second for next try */
1109 msleep(1000);
1110 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001111
1112 /*
1113 * Wait for USB flash devices with slow firmware.
1114 * Yes, this sense key/ASC combination shouldn't
1115 * occur here. It's characteristic of these devices.
1116 */
1117 } else if (sense_valid &&
1118 sshdr.sense_key == UNIT_ATTENTION &&
1119 sshdr.asc == 0x28) {
1120 if (!spintime) {
1121 spintime_expire = jiffies + 5 * HZ;
1122 spintime = 1;
1123 }
1124 /* Wait 1 second for next try */
1125 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 } else {
1127 /* we don't understand the sense code, so it's
1128 * probably pointless to loop */
1129 if(!spintime) {
1130 printk(KERN_NOTICE "%s: Unit Not Ready, "
1131 "sense:\n", diskname);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001132 scsi_print_sense_hdr("", &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 }
1134 break;
1135 }
1136
Alan Stern4451e472005-07-12 10:45:17 -04001137 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
1139 if (spintime) {
1140 if (scsi_status_is_good(the_result))
1141 printk("ready\n");
1142 else
1143 printk("not responding...\n");
1144 }
1145}
1146
1147/*
1148 * read disk capacity
1149 */
1150static void
1151sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001152 unsigned char *buffer)
1153{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 int the_result, retries;
1156 int sector_size = 0;
1157 int longrc = 0;
1158 struct scsi_sense_hdr sshdr;
1159 int sense_valid = 0;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001160 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
1162repeat:
1163 retries = 3;
1164 do {
1165 if (longrc) {
1166 memset((void *) cmd, 0, 16);
1167 cmd[0] = SERVICE_ACTION_IN;
1168 cmd[1] = SAI_READ_CAPACITY_16;
1169 cmd[13] = 12;
1170 memset((void *) buffer, 0, 12);
1171 } else {
1172 cmd[0] = READ_CAPACITY;
1173 memset((void *) &cmd[1], 0, 9);
1174 memset((void *) buffer, 0, 8);
1175 }
1176
James Bottomleyea73a9f2005-08-28 11:33:52 -05001177 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1178 buffer, longrc ? 12 : 8, &sshdr,
1179 SD_TIMEOUT, SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
James Bottomleyea73a9f2005-08-28 11:33:52 -05001181 if (media_not_present(sdkp, &sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 return;
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001185 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 retries--;
1187
1188 } while (the_result && retries);
1189
1190 if (the_result && !longrc) {
1191 printk(KERN_NOTICE "%s : READ CAPACITY failed.\n"
1192 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1193 diskname, diskname,
1194 status_byte(the_result),
1195 msg_byte(the_result),
1196 host_byte(the_result),
1197 driver_byte(the_result));
1198
1199 if (driver_byte(the_result) & DRIVER_SENSE)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001200 scsi_print_sense_hdr("sd", &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 else
1202 printk("%s : sense not available. \n", diskname);
1203
1204 /* Set dirty bit for removable devices if not ready -
1205 * sometimes drives will not report this properly. */
1206 if (sdp->removable &&
1207 sense_valid && sshdr.sense_key == NOT_READY)
1208 sdp->changed = 1;
1209
1210 /* Either no media are present but the drive didn't tell us,
1211 or they are present but the read capacity command fails */
1212 /* sdkp->media_present = 0; -- not always correct */
1213 sdkp->capacity = 0x200000; /* 1 GB - random */
1214
1215 return;
1216 } else if (the_result && longrc) {
1217 /* READ CAPACITY(16) has been failed */
1218 printk(KERN_NOTICE "%s : READ CAPACITY(16) failed.\n"
1219 "%s : status=%x, message=%02x, host=%d, driver=%02x \n",
1220 diskname, diskname,
1221 status_byte(the_result),
1222 msg_byte(the_result),
1223 host_byte(the_result),
1224 driver_byte(the_result));
1225 printk(KERN_NOTICE "%s : use 0xffffffff as device size\n",
1226 diskname);
1227
1228 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1229 goto got_data;
1230 }
1231
1232 if (!longrc) {
1233 sector_size = (buffer[4] << 24) |
1234 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1235 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1236 buffer[2] == 0xff && buffer[3] == 0xff) {
1237 if(sizeof(sdkp->capacity) > 4) {
1238 printk(KERN_NOTICE "%s : very big device. try to use"
1239 " READ CAPACITY(16).\n", diskname);
1240 longrc = 1;
1241 goto repeat;
1242 }
1243 printk(KERN_ERR "%s: too big for this kernel. Use a "
1244 "kernel compiled with support for large block "
1245 "devices.\n", diskname);
1246 sdkp->capacity = 0;
1247 goto got_data;
1248 }
1249 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1250 (buffer[1] << 16) |
1251 (buffer[2] << 8) |
1252 buffer[3]);
1253 } else {
1254 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1255 ((u64)buffer[1] << 48) |
1256 ((u64)buffer[2] << 40) |
1257 ((u64)buffer[3] << 32) |
1258 ((sector_t)buffer[4] << 24) |
1259 ((sector_t)buffer[5] << 16) |
1260 ((sector_t)buffer[6] << 8) |
1261 (sector_t)buffer[7]);
1262
1263 sector_size = (buffer[8] << 24) |
1264 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1265 }
1266
1267 /* Some devices return the total number of sectors, not the
1268 * highest sector number. Make the necessary adjustment. */
1269 if (sdp->fix_capacity)
1270 --sdkp->capacity;
1271
1272got_data:
1273 if (sector_size == 0) {
1274 sector_size = 512;
1275 printk(KERN_NOTICE "%s : sector size 0 reported, "
1276 "assuming 512.\n", diskname);
1277 }
1278
1279 if (sector_size != 512 &&
1280 sector_size != 1024 &&
1281 sector_size != 2048 &&
1282 sector_size != 4096 &&
1283 sector_size != 256) {
1284 printk(KERN_NOTICE "%s : unsupported sector size "
1285 "%d.\n", diskname, sector_size);
1286 /*
1287 * The user might want to re-format the drive with
1288 * a supported sectorsize. Once this happens, it
1289 * would be relatively trivial to set the thing up.
1290 * For this reason, we leave the thing in the table.
1291 */
1292 sdkp->capacity = 0;
1293 /*
1294 * set a bogus sector size so the normal read/write
1295 * logic in the block layer will eventually refuse any
1296 * request on this device without tripping over power
1297 * of two sector size assumptions
1298 */
1299 sector_size = 512;
1300 }
1301 {
1302 /*
1303 * The msdos fs needs to know the hardware sector size
1304 * So I have created this table. See ll_rw_blk.c
1305 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1306 */
1307 int hard_sector = sector_size;
James Bottomley7a691bd2005-10-28 13:17:30 -05001308 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 request_queue_t *queue = sdp->request_queue;
James Bottomley7a691bd2005-10-28 13:17:30 -05001310 sector_t mb = sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312 blk_queue_hardsect_size(queue, hard_sector);
1313 /* avoid 64-bit division on 32-bit platforms */
James Bottomley7a691bd2005-10-28 13:17:30 -05001314 sector_div(sz, 625);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 mb -= sz - 974;
1316 sector_div(mb, 1950);
1317
1318 printk(KERN_NOTICE "SCSI device %s: "
1319 "%llu %d-byte hdwr sectors (%llu MB)\n",
1320 diskname, (unsigned long long)sdkp->capacity,
1321 hard_sector, (unsigned long long)mb);
1322 }
1323
1324 /* Rescale capacity to 512-byte units */
1325 if (sector_size == 4096)
1326 sdkp->capacity <<= 3;
1327 else if (sector_size == 2048)
1328 sdkp->capacity <<= 2;
1329 else if (sector_size == 1024)
1330 sdkp->capacity <<= 1;
1331 else if (sector_size == 256)
1332 sdkp->capacity >>= 1;
1333
1334 sdkp->device->sector_size = sector_size;
1335}
1336
1337/* called with buffer of length 512 */
1338static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001339sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1340 unsigned char *buffer, int len, struct scsi_mode_data *data,
1341 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001343 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001344 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001345 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346}
1347
1348/*
1349 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001350 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 */
1352static void
1353sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001354 unsigned char *buffer)
1355{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001357 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 struct scsi_mode_data data;
1359
1360 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001361 if (sdp->skip_ms_page_3f) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname);
1363 return;
1364 }
1365
James Bottomleyea73a9f2005-08-28 11:33:52 -05001366 if (sdp->use_192_bytes_for_3f) {
1367 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 } else {
1369 /*
1370 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1371 * We have to start carefully: some devices hang if we ask
1372 * for more than is available.
1373 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001374 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
1376 /*
1377 * Second attempt: ask for page 0 When only page 0 is
1378 * implemented, a request for page 3F may return Sense Key
1379 * 5: Illegal Request, Sense Code 24: Invalid field in
1380 * CDB.
1381 */
1382 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001383 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 /*
1386 * Third attempt: ask 255 bytes, as we did earlier.
1387 */
1388 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001389 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1390 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 }
1392
1393 if (!scsi_status_is_good(res)) {
1394 printk(KERN_WARNING
1395 "%s: test WP failed, assume Write Enabled\n", diskname);
1396 } else {
1397 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1398 set_disk_ro(sdkp->disk, sdkp->write_prot);
1399 printk(KERN_NOTICE "%s: Write Protect is %s\n", diskname,
1400 sdkp->write_prot ? "on" : "off");
1401 printk(KERN_DEBUG "%s: Mode Sense: %02x %02x %02x %02x\n",
1402 diskname, buffer[0], buffer[1], buffer[2], buffer[3]);
1403 }
1404}
1405
1406/*
1407 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001408 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 */
1410static void
1411sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001412 unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01001413{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001415 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Al Viro 631e8a12005-05-16 01:59:55 +01001417 int dbd;
1418 int modepage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 struct scsi_mode_data data;
1420 struct scsi_sense_hdr sshdr;
1421
James Bottomleyea73a9f2005-08-28 11:33:52 -05001422 if (sdp->skip_ms_page_8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 goto defaults;
1424
James Bottomleyea73a9f2005-08-28 11:33:52 -05001425 if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01001426 modepage = 6;
1427 dbd = 8;
1428 } else {
1429 modepage = 8;
1430 dbd = 0;
1431 }
1432
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 /* cautiously ask */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001434 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435
1436 if (!scsi_status_is_good(res))
1437 goto bad_sense;
1438
Al Viro6d73c852006-02-23 02:03:16 +01001439 if (!data.header_length) {
1440 modepage = 6;
1441 printk(KERN_ERR "%s: missing header in MODE_SENSE response\n",
1442 diskname);
1443 }
1444
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 /* that went OK, now ask for the proper length */
1446 len = data.length;
1447
1448 /*
1449 * We're only interested in the first three bytes, actually.
1450 * But the data cache page is defined for the first 20.
1451 */
1452 if (len < 3)
1453 goto bad_sense;
1454 if (len > 20)
1455 len = 20;
1456
1457 /* Take headers and block descriptors into account */
1458 len += data.header_length + data.block_descriptor_length;
Al Viro48970802006-02-26 08:34:10 -06001459 if (len > SD_BUF_SIZE)
1460 goto bad_sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461
1462 /* Get the data */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001463 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
1465 if (scsi_status_is_good(res)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 int ct = 0;
Al Viro 631e8a12005-05-16 01:59:55 +01001467 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
Al Viro48970802006-02-26 08:34:10 -06001469 if (offset >= SD_BUF_SIZE - 2) {
1470 printk(KERN_ERR "%s: malformed MODE SENSE response",
1471 diskname);
1472 goto defaults;
1473 }
1474
Al Viro 631e8a12005-05-16 01:59:55 +01001475 if ((buffer[offset] & 0x3f) != modepage) {
1476 printk(KERN_ERR "%s: got wrong page\n", diskname);
1477 goto defaults;
1478 }
1479
1480 if (modepage == 8) {
1481 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1482 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1483 } else {
1484 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1485 sdkp->RCD = 0;
1486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Tejun Heo007365a2006-01-06 09:53:52 +01001488 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1489 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1490 printk(KERN_NOTICE "SCSI device %s: uses "
1491 "READ/WRITE(6), disabling FUA\n", diskname);
1492 sdkp->DPOFUA = 0;
1493 }
1494
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 ct = sdkp->RCD + 2*sdkp->WCE;
1496
Tejun Heo007365a2006-01-06 09:53:52 +01001497 printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n",
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001498 diskname, sd_cache_types[ct],
Tejun Heo007365a2006-01-06 09:53:52 +01001499 sdkp->DPOFUA ? " w/ FUA" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
1501 return;
1502 }
1503
1504bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05001505 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 sshdr.sense_key == ILLEGAL_REQUEST &&
1507 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1508 printk(KERN_NOTICE "%s: cache data unavailable\n",
1509 diskname); /* Invalid field in CDB */
1510 else
1511 printk(KERN_ERR "%s: asking for cache data failed\n",
1512 diskname);
1513
1514defaults:
1515 printk(KERN_ERR "%s: assuming drive cache: write through\n",
1516 diskname);
1517 sdkp->WCE = 0;
1518 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06001519 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520}
1521
1522/**
1523 * sd_revalidate_disk - called the first time a new disk is seen,
1524 * performs disk spin up, read_capacity, etc.
1525 * @disk: struct gendisk we care about
1526 **/
1527static int sd_revalidate_disk(struct gendisk *disk)
1528{
1529 struct scsi_disk *sdkp = scsi_disk(disk);
1530 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 unsigned char *buffer;
Tejun Heo461d4e92006-01-06 09:52:55 +01001532 unsigned ordered;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
1534 SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name));
1535
1536 /*
1537 * If the device is offline, don't try and read capacity or any
1538 * of the other niceties.
1539 */
1540 if (!scsi_device_online(sdp))
1541 goto out;
1542
Al Viro48970802006-02-26 08:34:10 -06001543 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 if (!buffer) {
1545 printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation "
1546 "failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05001547 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 }
1549
1550 /* defaults, until the device tells us otherwise */
1551 sdp->sector_size = 512;
1552 sdkp->capacity = 0;
1553 sdkp->media_present = 1;
1554 sdkp->write_prot = 0;
1555 sdkp->WCE = 0;
1556 sdkp->RCD = 0;
1557
James Bottomleyea73a9f2005-08-28 11:33:52 -05001558 sd_spinup_disk(sdkp, disk->disk_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
1560 /*
1561 * Without media there is no reason to ask; moreover, some devices
1562 * react badly if we do.
1563 */
1564 if (sdkp->media_present) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05001565 sd_read_capacity(sdkp, disk->disk_name, buffer);
Alan Stern38d76df2005-12-09 11:34:45 -05001566 sd_read_write_protect_flag(sdkp, disk->disk_name, buffer);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001567 sd_read_cache_type(sdkp, disk->disk_name, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 }
Tejun Heo461d4e92006-01-06 09:52:55 +01001569
1570 /*
1571 * We now have all cache related info, determine how we deal
1572 * with ordered requests. Note that as the current SCSI
1573 * dispatch function can alter request order, we cannot use
1574 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1575 */
1576 if (sdkp->WCE)
Tejun Heo007365a2006-01-06 09:53:52 +01001577 ordered = sdkp->DPOFUA
1578 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
Tejun Heo461d4e92006-01-06 09:52:55 +01001579 else
1580 ordered = QUEUE_ORDERED_DRAIN;
1581
1582 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 set_capacity(disk, sdkp->capacity);
1585 kfree(buffer);
1586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 out:
1588 return 0;
1589}
1590
1591/**
1592 * sd_probe - called during driver initialization and whenever a
1593 * new scsi device is attached to the system. It is called once
1594 * for each scsi device (not just disks) present.
1595 * @dev: pointer to device object
1596 *
1597 * Returns 0 if successful (or not interested in this scsi device
1598 * (e.g. scanner)); 1 when there is an error.
1599 *
1600 * Note: this function is invoked from the scsi mid-level.
1601 * This function sets up the mapping between a given
1602 * <host,channel,id,lun> (found in sdp) and new device name
1603 * (e.g. /dev/sda). More precisely it is the block device major
1604 * and minor number that is chosen here.
1605 *
1606 * Assume sd_attach is not re-entrant (for time being)
1607 * Also think about sd_attach() and sd_remove() running coincidentally.
1608 **/
1609static int sd_probe(struct device *dev)
1610{
1611 struct scsi_device *sdp = to_scsi_device(dev);
1612 struct scsi_disk *sdkp;
1613 struct gendisk *gd;
1614 u32 index;
1615 int error;
1616
1617 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01001618 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 goto out;
1620
James Bottomley9ccfc752005-10-02 11:45:08 -05001621 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1622 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623
1624 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05001625 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 if (!sdkp)
1627 goto out;
1628
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 gd = alloc_disk(16);
1630 if (!gd)
1631 goto out_free;
1632
1633 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1634 goto out_put;
1635
1636 spin_lock(&sd_index_lock);
1637 error = idr_get_new(&sd_index_idr, NULL, &index);
1638 spin_unlock(&sd_index_lock);
1639
1640 if (index >= SD_MAX_DISKS)
1641 error = -EBUSY;
1642 if (error)
1643 goto out_put;
1644
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001645 class_device_initialize(&sdkp->cdev);
1646 sdkp->cdev.dev = &sdp->sdev_gendev;
1647 sdkp->cdev.class = &sd_disk_class;
1648 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1649
1650 if (class_device_add(&sdkp->cdev))
1651 goto out_put;
1652
Alan Stern39b7f1e2005-11-04 14:44:41 -05001653 get_device(&sdp->sdev_gendev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001654
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 sdkp->device = sdp;
1656 sdkp->driver = &sd_template;
1657 sdkp->disk = gd;
1658 sdkp->index = index;
1659 sdkp->openers = 0;
1660
1661 if (!sdp->timeout) {
Al Viro 631e8a12005-05-16 01:59:55 +01001662 if (sdp->type != TYPE_MOD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 sdp->timeout = SD_TIMEOUT;
1664 else
1665 sdp->timeout = SD_MOD_TIMEOUT;
1666 }
1667
1668 gd->major = sd_major((index & 0xf0) >> 4);
1669 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1670 gd->minors = 16;
1671 gd->fops = &sd_fops;
1672
1673 if (index < 26) {
1674 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1675 } else if (index < (26 + 1) * 26) {
1676 sprintf(gd->disk_name, "sd%c%c",
1677 'a' + index / 26 - 1,'a' + index % 26);
1678 } else {
1679 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1680 const unsigned int m2 = (index / 26 - 1) % 26;
1681 const unsigned int m3 = index % 26;
1682 sprintf(gd->disk_name, "sd%c%c%c",
1683 'a' + m1, 'a' + m2, 'a' + m3);
1684 }
1685
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 gd->private_data = &sdkp->driver;
Tejun Heo461d4e92006-01-06 09:52:55 +01001687 gd->queue = sdkp->device->request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
1689 sd_revalidate_disk(gd);
1690
1691 gd->driverfs_dev = &sdp->sdev_gendev;
1692 gd->flags = GENHD_FL_DRIVERFS;
1693 if (sdp->removable)
1694 gd->flags |= GENHD_FL_REMOVABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695
1696 dev_set_drvdata(dev, sdkp);
1697 add_disk(gd);
1698
James Bottomley9ccfc752005-10-02 11:45:08 -05001699 sdev_printk(KERN_NOTICE, sdp, "Attached scsi %sdisk %s\n",
1700 sdp->removable ? "removable " : "", gd->disk_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
1702 return 0;
1703
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001704 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001706 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001708 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 return error;
1710}
1711
1712/**
1713 * sd_remove - called whenever a scsi disk (previously recognized by
1714 * sd_probe) is detached from the system. It is called (potentially
1715 * multiple times) during sd module unload.
1716 * @sdp: pointer to mid level scsi device object
1717 *
1718 * Note: this function is invoked from the scsi mid-level.
1719 * This function potentially frees up a device name (e.g. /dev/sdc)
1720 * that could be re-used by a subsequent sd_probe().
1721 * This function is not called when the built-in sd driver is "exit-ed".
1722 **/
1723static int sd_remove(struct device *dev)
1724{
1725 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1726
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001727 class_device_del(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 del_gendisk(sdkp->disk);
1729 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001730
Arjan van de Ven0b950672006-01-11 13:16:10 +01001731 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001732 dev_set_drvdata(dev, NULL);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001733 class_device_put(&sdkp->cdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001734 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735
1736 return 0;
1737}
1738
1739/**
1740 * scsi_disk_release - Called to free the scsi_disk structure
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001741 * @cdev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01001743 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 * called on last put, you should always use the scsi_disk_get()
1745 * scsi_disk_put() helpers which manipulate the semaphore directly
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001746 * and never do a direct class_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 **/
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001748static void scsi_disk_release(struct class_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749{
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001750 struct scsi_disk *sdkp = to_scsi_disk(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 struct gendisk *disk = sdkp->disk;
1752
1753 spin_lock(&sd_index_lock);
1754 idr_remove(&sd_index_idr, sdkp->index);
1755 spin_unlock(&sd_index_lock);
1756
1757 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001759 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760
1761 kfree(sdkp);
1762}
1763
1764/*
1765 * Send a SYNCHRONIZE CACHE instruction down to the device through
1766 * the normal SCSI command structure. Wait for the command to
1767 * complete.
1768 */
1769static void sd_shutdown(struct device *dev)
1770{
1771 struct scsi_device *sdp = to_scsi_device(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001772 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
1774 if (!sdkp)
1775 return; /* this can happen */
1776
Alan Stern39b7f1e2005-11-04 14:44:41 -05001777 if (sdkp->WCE) {
1778 printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n",
1779 sdkp->disk->disk_name);
1780 sd_sync_cache(sdp);
1781 }
1782 scsi_disk_put(sdkp);
1783}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
1785/**
1786 * init_sd - entry point for this driver (both when built in or when
1787 * a module).
1788 *
1789 * Note: this function registers this driver with the scsi mid-level.
1790 **/
1791static int __init init_sd(void)
1792{
1793 int majors = 0, i;
1794
1795 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1796
1797 for (i = 0; i < SD_MAJORS; i++)
1798 if (register_blkdev(sd_major(i), "sd") == 0)
1799 majors++;
1800
1801 if (!majors)
1802 return -ENODEV;
1803
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001804 class_register(&sd_disk_class);
1805
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 return scsi_register_driver(&sd_template.gendrv);
1807}
1808
1809/**
1810 * exit_sd - exit point for this driver (when it is a module).
1811 *
1812 * Note: this function unregisters this driver from the scsi mid-level.
1813 **/
1814static void __exit exit_sd(void)
1815{
1816 int i;
1817
1818 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1819
1820 scsi_unregister_driver(&sd_template.gendrv);
1821 for (i = 0; i < SD_MAJORS; i++)
1822 unregister_blkdev(sd_major(i), "sd");
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001823
1824 class_unregister(&sd_disk_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825}
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827module_init(init_sd);
1828module_exit(exit_sd);