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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/fs.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/mm.h> | |
40 | #include <linux/bio.h> | |
41 | #include <linux/genhd.h> | |
42 | #include <linux/hdreg.h> | |
43 | #include <linux/errno.h> | |
44 | #include <linux/idr.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/init.h> | |
47 | #include <linux/blkdev.h> | |
48 | #include <linux/blkpg.h> | |
1da177e4 | 49 | #include <linux/delay.h> |
0b950672 | 50 | #include <linux/mutex.h> |
1da177e4 LT |
51 | #include <asm/uaccess.h> |
52 | ||
53 | #include <scsi/scsi.h> | |
54 | #include <scsi/scsi_cmnd.h> | |
55 | #include <scsi/scsi_dbg.h> | |
56 | #include <scsi/scsi_device.h> | |
57 | #include <scsi/scsi_driver.h> | |
58 | #include <scsi/scsi_eh.h> | |
59 | #include <scsi/scsi_host.h> | |
60 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
61 | #include <scsi/scsicam.h> |
62 | ||
63 | #include "scsi_logging.h" | |
64 | ||
65 | /* | |
66 | * More than enough for everybody ;) The huge number of majors | |
67 | * is a leftover from 16bit dev_t days, we don't really need that | |
68 | * much numberspace. | |
69 | */ | |
70 | #define SD_MAJORS 16 | |
71 | ||
f018fa55 RH |
72 | MODULE_AUTHOR("Eric Youngdale"); |
73 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
74 | MODULE_LICENSE("GPL"); | |
75 | ||
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
89 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
90 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
91 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
92 | ||
1da177e4 LT |
93 | /* |
94 | * This is limited by the naming scheme enforced in sd_probe, | |
95 | * add another character to it if you really need more disks. | |
96 | */ | |
97 | #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26) | |
98 | ||
99 | /* | |
100 | * Time out in seconds for disks and Magneto-opticals (which are slower). | |
101 | */ | |
102 | #define SD_TIMEOUT (30 * HZ) | |
103 | #define SD_MOD_TIMEOUT (75 * HZ) | |
104 | ||
105 | /* | |
106 | * Number of allowed retries | |
107 | */ | |
108 | #define SD_MAX_RETRIES 5 | |
109 | #define SD_PASSTHROUGH_RETRIES 1 | |
110 | ||
48970800 AV |
111 | /* |
112 | * Size of the initial data buffer for mode and read capacity data | |
113 | */ | |
114 | #define SD_BUF_SIZE 512 | |
115 | ||
1da177e4 LT |
116 | struct scsi_disk { |
117 | struct scsi_driver *driver; /* always &sd_template */ | |
118 | struct scsi_device *device; | |
6bdaa1f1 | 119 | struct class_device cdev; |
1da177e4 LT |
120 | struct gendisk *disk; |
121 | unsigned int openers; /* protected by BKL for now, yuck */ | |
122 | sector_t capacity; /* size in 512-byte sectors */ | |
123 | u32 index; | |
124 | u8 media_present; | |
125 | u8 write_prot; | |
126 | unsigned WCE : 1; /* state of disk WCE bit */ | |
127 | unsigned RCD : 1; /* state of disk RCD bit, unused */ | |
007365ad | 128 | unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ |
1da177e4 | 129 | }; |
6bdaa1f1 | 130 | #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev) |
1da177e4 LT |
131 | |
132 | static DEFINE_IDR(sd_index_idr); | |
133 | static DEFINE_SPINLOCK(sd_index_lock); | |
134 | ||
135 | /* This semaphore is used to mediate the 0->1 reference get in the | |
136 | * face of object destruction (i.e. we can't allow a get on an | |
137 | * object after last put) */ | |
0b950672 | 138 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 LT |
139 | |
140 | static int sd_revalidate_disk(struct gendisk *disk); | |
141 | static void sd_rw_intr(struct scsi_cmnd * SCpnt); | |
142 | ||
143 | static int sd_probe(struct device *); | |
144 | static int sd_remove(struct device *); | |
145 | static void sd_shutdown(struct device *dev); | |
146 | static void sd_rescan(struct device *); | |
147 | static int sd_init_command(struct scsi_cmnd *); | |
148 | static int sd_issue_flush(struct device *, sector_t *); | |
461d4e90 | 149 | static void sd_prepare_flush(request_queue_t *, struct request *); |
1da177e4 | 150 | static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, |
ea73a9f2 | 151 | unsigned char *buffer); |
6bdaa1f1 JB |
152 | static void scsi_disk_release(struct class_device *cdev); |
153 | ||
154 | static const char *sd_cache_types[] = { | |
155 | "write through", "none", "write back", | |
156 | "write back, no read (daft)" | |
157 | }; | |
158 | ||
159 | static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, | |
160 | size_t count) | |
161 | { | |
162 | int i, ct = -1, rcd, wce, sp; | |
163 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
164 | struct scsi_device *sdp = sdkp->device; | |
165 | char buffer[64]; | |
166 | char *buffer_data; | |
167 | struct scsi_mode_data data; | |
168 | struct scsi_sense_hdr sshdr; | |
169 | int len; | |
170 | ||
171 | if (sdp->type != TYPE_DISK) | |
172 | /* no cache control on RBC devices; theoretically they | |
173 | * can do it, but there's probably so many exceptions | |
174 | * it's not worth the risk */ | |
175 | return -EINVAL; | |
176 | ||
6391a113 | 177 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
178 | const int len = strlen(sd_cache_types[i]); |
179 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
180 | buf[len] == '\n') { | |
181 | ct = i; | |
182 | break; | |
183 | } | |
184 | } | |
185 | if (ct < 0) | |
186 | return -EINVAL; | |
187 | rcd = ct & 0x01 ? 1 : 0; | |
188 | wce = ct & 0x02 ? 1 : 0; | |
189 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
190 | SD_MAX_RETRIES, &data, NULL)) | |
191 | return -EINVAL; | |
a9312fb8 | 192 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
193 | data.block_descriptor_length); |
194 | buffer_data = buffer + data.header_length + | |
195 | data.block_descriptor_length; | |
196 | buffer_data[2] &= ~0x05; | |
197 | buffer_data[2] |= wce << 2 | rcd; | |
198 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
199 | ||
200 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
201 | SD_MAX_RETRIES, &data, &sshdr)) { | |
202 | if (scsi_sense_valid(&sshdr)) | |
203 | scsi_print_sense_hdr(sdkp->disk->disk_name, &sshdr); | |
204 | return -EINVAL; | |
205 | } | |
206 | sd_revalidate_disk(sdkp->disk); | |
207 | return count; | |
208 | } | |
209 | ||
a144c5ae BK |
210 | static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, |
211 | size_t count) | |
212 | { | |
213 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
214 | struct scsi_device *sdp = sdkp->device; | |
215 | ||
216 | if (!capable(CAP_SYS_ADMIN)) | |
217 | return -EACCES; | |
218 | ||
219 | if (sdp->type != TYPE_DISK) | |
220 | return -EINVAL; | |
221 | ||
222 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
223 | ||
224 | return count; | |
225 | } | |
226 | ||
6bdaa1f1 JB |
227 | static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) |
228 | { | |
229 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
230 | int ct = sdkp->RCD + 2*sdkp->WCE; | |
231 | ||
232 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
233 | } | |
234 | ||
235 | static ssize_t sd_show_fua(struct class_device *cdev, char *buf) | |
236 | { | |
237 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
238 | ||
239 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
240 | } | |
241 | ||
a144c5ae BK |
242 | static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) |
243 | { | |
244 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
245 | ||
246 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
247 | } | |
248 | ||
6bdaa1f1 JB |
249 | static struct class_device_attribute sd_disk_attrs[] = { |
250 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, | |
251 | sd_store_cache_type), | |
252 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
253 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
254 | sd_store_allow_restart), | |
6bdaa1f1 JB |
255 | __ATTR_NULL, |
256 | }; | |
257 | ||
258 | static struct class sd_disk_class = { | |
259 | .name = "scsi_disk", | |
260 | .owner = THIS_MODULE, | |
261 | .release = scsi_disk_release, | |
262 | .class_dev_attrs = sd_disk_attrs, | |
263 | }; | |
1da177e4 LT |
264 | |
265 | static struct scsi_driver sd_template = { | |
266 | .owner = THIS_MODULE, | |
267 | .gendrv = { | |
268 | .name = "sd", | |
269 | .probe = sd_probe, | |
270 | .remove = sd_remove, | |
271 | .shutdown = sd_shutdown, | |
272 | }, | |
273 | .rescan = sd_rescan, | |
274 | .init_command = sd_init_command, | |
275 | .issue_flush = sd_issue_flush, | |
1da177e4 LT |
276 | }; |
277 | ||
278 | /* | |
279 | * Device no to disk mapping: | |
280 | * | |
281 | * major disc2 disc p1 | |
282 | * |............|.............|....|....| <- dev_t | |
283 | * 31 20 19 8 7 4 3 0 | |
284 | * | |
285 | * Inside a major, we have 16k disks, however mapped non- | |
286 | * contiguously. The first 16 disks are for major0, the next | |
287 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
288 | * for major1, ... | |
289 | * As we stay compatible with our numbering scheme, we can reuse | |
290 | * the well-know SCSI majors 8, 65--71, 136--143. | |
291 | */ | |
292 | static int sd_major(int major_idx) | |
293 | { | |
294 | switch (major_idx) { | |
295 | case 0: | |
296 | return SCSI_DISK0_MAJOR; | |
297 | case 1 ... 7: | |
298 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
299 | case 8 ... 15: | |
300 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
301 | default: | |
302 | BUG(); | |
303 | return 0; /* shut up gcc */ | |
304 | } | |
305 | } | |
306 | ||
1da177e4 LT |
307 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) |
308 | { | |
309 | return container_of(disk->private_data, struct scsi_disk, driver); | |
310 | } | |
311 | ||
39b7f1e2 | 312 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
313 | { |
314 | struct scsi_disk *sdkp = NULL; | |
315 | ||
39b7f1e2 AS |
316 | if (disk->private_data) { |
317 | sdkp = scsi_disk(disk); | |
318 | if (scsi_device_get(sdkp->device) == 0) | |
6bdaa1f1 | 319 | class_device_get(&sdkp->cdev); |
39b7f1e2 AS |
320 | else |
321 | sdkp = NULL; | |
322 | } | |
323 | return sdkp; | |
324 | } | |
325 | ||
326 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
327 | { | |
328 | struct scsi_disk *sdkp; | |
329 | ||
0b950672 | 330 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 331 | sdkp = __scsi_disk_get(disk); |
0b950672 | 332 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 333 | return sdkp; |
39b7f1e2 | 334 | } |
1da177e4 | 335 | |
39b7f1e2 AS |
336 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
337 | { | |
338 | struct scsi_disk *sdkp; | |
339 | ||
0b950672 | 340 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
341 | sdkp = dev_get_drvdata(dev); |
342 | if (sdkp) | |
343 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 344 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
345 | return sdkp; |
346 | } | |
347 | ||
348 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
349 | { | |
350 | struct scsi_device *sdev = sdkp->device; | |
351 | ||
0b950672 | 352 | mutex_lock(&sd_ref_mutex); |
6bdaa1f1 | 353 | class_device_put(&sdkp->cdev); |
1da177e4 | 354 | scsi_device_put(sdev); |
0b950672 | 355 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
356 | } |
357 | ||
358 | /** | |
359 | * sd_init_command - build a scsi (read or write) command from | |
360 | * information in the request structure. | |
361 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
362 | * contains request and into which the scsi command is written | |
363 | * | |
364 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
365 | **/ | |
366 | static int sd_init_command(struct scsi_cmnd * SCpnt) | |
367 | { | |
1da177e4 LT |
368 | struct scsi_device *sdp = SCpnt->device; |
369 | struct request *rq = SCpnt->request; | |
776b23a0 CH |
370 | struct gendisk *disk = rq->rq_disk; |
371 | sector_t block = rq->sector; | |
372 | unsigned int this_count = SCpnt->request_bufflen >> 9; | |
373 | unsigned int timeout = sdp->timeout; | |
1da177e4 LT |
374 | |
375 | SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, " | |
376 | "count=%d\n", disk->disk_name, | |
377 | (unsigned long long)block, this_count)); | |
378 | ||
379 | if (!sdp || !scsi_device_online(sdp) || | |
380 | block + rq->nr_sectors > get_capacity(disk)) { | |
381 | SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", | |
382 | rq->nr_sectors)); | |
383 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | if (sdp->changed) { | |
388 | /* | |
389 | * quietly refuse to do anything to a changed disc until | |
390 | * the changed bit has been reset | |
391 | */ | |
392 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
393 | return 0; | |
394 | } | |
395 | SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n", | |
396 | disk->disk_name, (unsigned long long)block)); | |
397 | ||
398 | /* | |
399 | * If we have a 1K hardware sectorsize, prevent access to single | |
400 | * 512 byte sectors. In theory we could handle this - in fact | |
401 | * the scsi cdrom driver must be able to handle this because | |
402 | * we typically use 1K blocksizes, and cdroms typically have | |
403 | * 2K hardware sectorsizes. Of course, things are simpler | |
404 | * with the cdrom, since it is read-only. For performance | |
405 | * reasons, the filesystems should be able to handle this | |
406 | * and not force the scsi disk driver to use bounce buffers | |
407 | * for this. | |
408 | */ | |
409 | if (sdp->sector_size == 1024) { | |
410 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
411 | printk(KERN_ERR "sd: Bad block number requested"); | |
412 | return 0; | |
413 | } else { | |
414 | block = block >> 1; | |
415 | this_count = this_count >> 1; | |
416 | } | |
417 | } | |
418 | if (sdp->sector_size == 2048) { | |
419 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
420 | printk(KERN_ERR "sd: Bad block number requested"); | |
421 | return 0; | |
422 | } else { | |
423 | block = block >> 2; | |
424 | this_count = this_count >> 2; | |
425 | } | |
426 | } | |
427 | if (sdp->sector_size == 4096) { | |
428 | if ((block & 7) || (rq->nr_sectors & 7)) { | |
429 | printk(KERN_ERR "sd: Bad block number requested"); | |
430 | return 0; | |
431 | } else { | |
432 | block = block >> 3; | |
433 | this_count = this_count >> 3; | |
434 | } | |
435 | } | |
436 | if (rq_data_dir(rq) == WRITE) { | |
437 | if (!sdp->writeable) { | |
438 | return 0; | |
439 | } | |
440 | SCpnt->cmnd[0] = WRITE_6; | |
441 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
442 | } else if (rq_data_dir(rq) == READ) { | |
443 | SCpnt->cmnd[0] = READ_6; | |
444 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
445 | } else { | |
446 | printk(KERN_ERR "sd: Unknown command %lx\n", rq->flags); | |
447 | /* overkill panic("Unknown sd command %lx\n", rq->flags); */ | |
448 | return 0; | |
449 | } | |
450 | ||
451 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", | |
452 | disk->disk_name, (rq_data_dir(rq) == WRITE) ? | |
453 | "writing" : "reading", this_count, rq->nr_sectors)); | |
454 | ||
455 | SCpnt->cmnd[1] = 0; | |
456 | ||
457 | if (block > 0xffffffff) { | |
458 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 459 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
460 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
461 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
462 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
463 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
464 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
465 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
466 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
467 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
468 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
469 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
470 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
471 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
472 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
473 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
474 | SCpnt->device->use_10_for_rw) { | |
475 | if (this_count > 0xffff) | |
476 | this_count = 0xffff; | |
477 | ||
478 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 479 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
480 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
481 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
482 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
483 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
484 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
485 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
486 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
487 | } else { | |
007365ad TH |
488 | if (unlikely(blk_fua_rq(rq))) { |
489 | /* | |
490 | * This happens only if this drive failed | |
491 | * 10byte rw command with ILLEGAL_REQUEST | |
492 | * during operation and thus turned off | |
493 | * use_10_for_rw. | |
494 | */ | |
495 | printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n"); | |
496 | return 0; | |
497 | } | |
498 | ||
1da177e4 LT |
499 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
500 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
501 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
502 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
503 | SCpnt->cmnd[5] = 0; | |
504 | } | |
505 | SCpnt->request_bufflen = SCpnt->bufflen = | |
506 | this_count * sdp->sector_size; | |
507 | ||
508 | /* | |
509 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
510 | * host adapter, it's safe to assume that we can at least transfer | |
511 | * this many bytes between each connect / disconnect. | |
512 | */ | |
513 | SCpnt->transfersize = sdp->sector_size; | |
514 | SCpnt->underflow = this_count << 9; | |
515 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 LT |
516 | SCpnt->timeout_per_command = timeout; |
517 | ||
518 | /* | |
519 | * This is the completion routine we use. This is matched in terms | |
520 | * of capability to this function. | |
521 | */ | |
522 | SCpnt->done = sd_rw_intr; | |
523 | ||
524 | /* | |
525 | * This indicates that the command is ready from our end to be | |
526 | * queued. | |
527 | */ | |
528 | return 1; | |
529 | } | |
530 | ||
531 | /** | |
532 | * sd_open - open a scsi disk device | |
533 | * @inode: only i_rdev member may be used | |
534 | * @filp: only f_mode and f_flags may be used | |
535 | * | |
536 | * Returns 0 if successful. Returns a negated errno value in case | |
537 | * of error. | |
538 | * | |
539 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
540 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
541 | * In the latter case @inode and @filp carry an abridged amount | |
542 | * of information as noted above. | |
543 | **/ | |
544 | static int sd_open(struct inode *inode, struct file *filp) | |
545 | { | |
546 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
547 | struct scsi_disk *sdkp; | |
548 | struct scsi_device *sdev; | |
549 | int retval; | |
550 | ||
551 | if (!(sdkp = scsi_disk_get(disk))) | |
552 | return -ENXIO; | |
553 | ||
554 | ||
555 | SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name)); | |
556 | ||
557 | sdev = sdkp->device; | |
558 | ||
559 | /* | |
560 | * If the device is in error recovery, wait until it is done. | |
561 | * If the device is offline, then disallow any access to it. | |
562 | */ | |
563 | retval = -ENXIO; | |
564 | if (!scsi_block_when_processing_errors(sdev)) | |
565 | goto error_out; | |
566 | ||
567 | if (sdev->removable || sdkp->write_prot) | |
568 | check_disk_change(inode->i_bdev); | |
569 | ||
570 | /* | |
571 | * If the drive is empty, just let the open fail. | |
572 | */ | |
573 | retval = -ENOMEDIUM; | |
574 | if (sdev->removable && !sdkp->media_present && | |
575 | !(filp->f_flags & O_NDELAY)) | |
576 | goto error_out; | |
577 | ||
578 | /* | |
579 | * If the device has the write protect tab set, have the open fail | |
580 | * if the user expects to be able to write to the thing. | |
581 | */ | |
582 | retval = -EROFS; | |
583 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
584 | goto error_out; | |
585 | ||
586 | /* | |
587 | * It is possible that the disk changing stuff resulted in | |
588 | * the device being taken offline. If this is the case, | |
589 | * report this to the user, and don't pretend that the | |
590 | * open actually succeeded. | |
591 | */ | |
592 | retval = -ENXIO; | |
593 | if (!scsi_device_online(sdev)) | |
594 | goto error_out; | |
595 | ||
596 | if (!sdkp->openers++ && sdev->removable) { | |
597 | if (scsi_block_when_processing_errors(sdev)) | |
598 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
599 | } | |
600 | ||
601 | return 0; | |
602 | ||
603 | error_out: | |
604 | scsi_disk_put(sdkp); | |
605 | return retval; | |
606 | } | |
607 | ||
608 | /** | |
609 | * sd_release - invoked when the (last) close(2) is called on this | |
610 | * scsi disk. | |
611 | * @inode: only i_rdev member may be used | |
612 | * @filp: only f_mode and f_flags may be used | |
613 | * | |
614 | * Returns 0. | |
615 | * | |
616 | * Note: may block (uninterruptible) if error recovery is underway | |
617 | * on this disk. | |
618 | **/ | |
619 | static int sd_release(struct inode *inode, struct file *filp) | |
620 | { | |
621 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
622 | struct scsi_disk *sdkp = scsi_disk(disk); | |
623 | struct scsi_device *sdev = sdkp->device; | |
624 | ||
625 | SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name)); | |
626 | ||
627 | if (!--sdkp->openers && sdev->removable) { | |
628 | if (scsi_block_when_processing_errors(sdev)) | |
629 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
630 | } | |
631 | ||
632 | /* | |
633 | * XXX and what if there are packets in flight and this close() | |
634 | * XXX is followed by a "rmmod sd_mod"? | |
635 | */ | |
636 | scsi_disk_put(sdkp); | |
637 | return 0; | |
638 | } | |
639 | ||
a885c8c4 | 640 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
641 | { |
642 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
643 | struct scsi_device *sdp = sdkp->device; | |
644 | struct Scsi_Host *host = sdp->host; | |
645 | int diskinfo[4]; | |
646 | ||
647 | /* default to most commonly used values */ | |
648 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
649 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
650 | diskinfo[2] = sdkp->capacity >> 11; | |
651 | ||
652 | /* override with calculated, extended default, or driver values */ | |
653 | if (host->hostt->bios_param) | |
654 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
655 | else | |
656 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
657 | ||
a885c8c4 CH |
658 | geo->heads = diskinfo[0]; |
659 | geo->sectors = diskinfo[1]; | |
660 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
661 | return 0; |
662 | } | |
663 | ||
664 | /** | |
665 | * sd_ioctl - process an ioctl | |
666 | * @inode: only i_rdev/i_bdev members may be used | |
667 | * @filp: only f_mode and f_flags may be used | |
668 | * @cmd: ioctl command number | |
669 | * @arg: this is third argument given to ioctl(2) system call. | |
670 | * Often contains a pointer. | |
671 | * | |
672 | * Returns 0 if successful (some ioctls return postive numbers on | |
673 | * success as well). Returns a negated errno value in case of error. | |
674 | * | |
675 | * Note: most ioctls are forward onto the block subsystem or further | |
676 | * down in the scsi subsytem. | |
677 | **/ | |
678 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
679 | unsigned int cmd, unsigned long arg) | |
680 | { | |
681 | struct block_device *bdev = inode->i_bdev; | |
682 | struct gendisk *disk = bdev->bd_disk; | |
683 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
684 | void __user *p = (void __user *)arg; | |
685 | int error; | |
686 | ||
687 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
688 | disk->disk_name, cmd)); | |
689 | ||
690 | /* | |
691 | * If we are in the middle of error recovery, don't let anyone | |
692 | * else try and use this device. Also, if error recovery fails, it | |
693 | * may try and take the device offline, in which case all further | |
694 | * access to the device is prohibited. | |
695 | */ | |
696 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); | |
697 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
698 | return error; | |
699 | ||
1da177e4 LT |
700 | /* |
701 | * Send SCSI addressing ioctls directly to mid level, send other | |
702 | * ioctls to block level and then onto mid level if they can't be | |
703 | * resolved. | |
704 | */ | |
705 | switch (cmd) { | |
706 | case SCSI_IOCTL_GET_IDLUN: | |
707 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
708 | return scsi_ioctl(sdp, cmd, p); | |
709 | default: | |
710 | error = scsi_cmd_ioctl(filp, disk, cmd, p); | |
711 | if (error != -ENOTTY) | |
712 | return error; | |
713 | } | |
714 | return scsi_ioctl(sdp, cmd, p); | |
715 | } | |
716 | ||
717 | static void set_media_not_present(struct scsi_disk *sdkp) | |
718 | { | |
719 | sdkp->media_present = 0; | |
720 | sdkp->capacity = 0; | |
721 | sdkp->device->changed = 1; | |
722 | } | |
723 | ||
724 | /** | |
725 | * sd_media_changed - check if our medium changed | |
726 | * @disk: kernel device descriptor | |
727 | * | |
728 | * Returns 0 if not applicable or no change; 1 if change | |
729 | * | |
730 | * Note: this function is invoked from the block subsystem. | |
731 | **/ | |
732 | static int sd_media_changed(struct gendisk *disk) | |
733 | { | |
734 | struct scsi_disk *sdkp = scsi_disk(disk); | |
735 | struct scsi_device *sdp = sdkp->device; | |
736 | int retval; | |
737 | ||
738 | SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n", | |
739 | disk->disk_name)); | |
740 | ||
741 | if (!sdp->removable) | |
742 | return 0; | |
743 | ||
744 | /* | |
745 | * If the device is offline, don't send any commands - just pretend as | |
746 | * if the command failed. If the device ever comes back online, we | |
747 | * can deal with it then. It is only because of unrecoverable errors | |
748 | * that we would ever take a device offline in the first place. | |
749 | */ | |
750 | if (!scsi_device_online(sdp)) | |
751 | goto not_present; | |
752 | ||
753 | /* | |
754 | * Using TEST_UNIT_READY enables differentiation between drive with | |
755 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
756 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
757 | * | |
758 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
759 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
760 | * sd_revalidate() is called. | |
761 | */ | |
762 | retval = -ENODEV; | |
763 | if (scsi_block_when_processing_errors(sdp)) | |
764 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); | |
765 | ||
766 | /* | |
767 | * Unable to test, unit probably not ready. This usually | |
768 | * means there is no disc in the drive. Mark as changed, | |
769 | * and we will figure it out later once the drive is | |
770 | * available again. | |
771 | */ | |
772 | if (retval) | |
773 | goto not_present; | |
774 | ||
775 | /* | |
776 | * For removable scsi disk we have to recognise the presence | |
777 | * of a disk in the drive. This is kept in the struct scsi_disk | |
778 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
779 | */ | |
780 | sdkp->media_present = 1; | |
781 | ||
782 | retval = sdp->changed; | |
783 | sdp->changed = 0; | |
784 | ||
785 | return retval; | |
786 | ||
787 | not_present: | |
788 | set_media_not_present(sdkp); | |
789 | return 1; | |
790 | } | |
791 | ||
792 | static int sd_sync_cache(struct scsi_device *sdp) | |
793 | { | |
1da177e4 | 794 | int retries, res; |
ea73a9f2 | 795 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
796 | |
797 | if (!scsi_device_online(sdp)) | |
798 | return -ENODEV; | |
799 | ||
1da177e4 | 800 | |
1da177e4 LT |
801 | for (retries = 3; retries > 0; --retries) { |
802 | unsigned char cmd[10] = { 0 }; | |
803 | ||
804 | cmd[0] = SYNCHRONIZE_CACHE; | |
805 | /* | |
806 | * Leave the rest of the command zero to indicate | |
807 | * flush everything. | |
808 | */ | |
ea73a9f2 JB |
809 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
810 | SD_TIMEOUT, SD_MAX_RETRIES); | |
811 | if (res == 0) | |
1da177e4 LT |
812 | break; |
813 | } | |
814 | ||
ea73a9f2 | 815 | if (res) { printk(KERN_WARNING "FAILED\n status = %x, message = %02x, " |
1da177e4 LT |
816 | "host = %d, driver = %02x\n ", |
817 | status_byte(res), msg_byte(res), | |
818 | host_byte(res), driver_byte(res)); | |
819 | if (driver_byte(res) & DRIVER_SENSE) | |
ea73a9f2 | 820 | scsi_print_sense_hdr("sd", &sshdr); |
1da177e4 LT |
821 | } |
822 | ||
1da177e4 LT |
823 | return res; |
824 | } | |
825 | ||
826 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) | |
827 | { | |
39b7f1e2 | 828 | int ret = 0; |
1da177e4 | 829 | struct scsi_device *sdp = to_scsi_device(dev); |
39b7f1e2 | 830 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
831 | |
832 | if (!sdkp) | |
833 | return -ENODEV; | |
834 | ||
39b7f1e2 AS |
835 | if (sdkp->WCE) |
836 | ret = sd_sync_cache(sdp); | |
837 | scsi_disk_put(sdkp); | |
838 | return ret; | |
1da177e4 LT |
839 | } |
840 | ||
461d4e90 | 841 | static void sd_prepare_flush(request_queue_t *q, struct request *rq) |
1da177e4 | 842 | { |
c0ed79a3 | 843 | memset(rq->cmd, 0, sizeof(rq->cmd)); |
461d4e90 | 844 | rq->flags |= REQ_BLOCK_PC; |
c0ed79a3 JB |
845 | rq->timeout = SD_TIMEOUT; |
846 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 847 | rq->cmd_len = 10; |
1da177e4 LT |
848 | } |
849 | ||
850 | static void sd_rescan(struct device *dev) | |
851 | { | |
39b7f1e2 AS |
852 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
853 | ||
854 | if (sdkp) { | |
855 | sd_revalidate_disk(sdkp->disk); | |
856 | scsi_disk_put(sdkp); | |
857 | } | |
1da177e4 LT |
858 | } |
859 | ||
860 | ||
861 | #ifdef CONFIG_COMPAT | |
862 | /* | |
863 | * This gets directly called from VFS. When the ioctl | |
864 | * is not recognized we go back to the other translation paths. | |
865 | */ | |
866 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
867 | { | |
868 | struct block_device *bdev = file->f_dentry->d_inode->i_bdev; | |
869 | struct gendisk *disk = bdev->bd_disk; | |
870 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
871 | ||
872 | /* | |
873 | * If we are in the middle of error recovery, don't let anyone | |
874 | * else try and use this device. Also, if error recovery fails, it | |
875 | * may try and take the device offline, in which case all further | |
876 | * access to the device is prohibited. | |
877 | */ | |
878 | if (!scsi_block_when_processing_errors(sdev)) | |
879 | return -ENODEV; | |
880 | ||
881 | if (sdev->host->hostt->compat_ioctl) { | |
882 | int ret; | |
883 | ||
884 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
885 | ||
886 | return ret; | |
887 | } | |
888 | ||
889 | /* | |
890 | * Let the static ioctl translation table take care of it. | |
891 | */ | |
892 | return -ENOIOCTLCMD; | |
893 | } | |
894 | #endif | |
895 | ||
896 | static struct block_device_operations sd_fops = { | |
897 | .owner = THIS_MODULE, | |
898 | .open = sd_open, | |
899 | .release = sd_release, | |
900 | .ioctl = sd_ioctl, | |
a885c8c4 | 901 | .getgeo = sd_getgeo, |
1da177e4 LT |
902 | #ifdef CONFIG_COMPAT |
903 | .compat_ioctl = sd_compat_ioctl, | |
904 | #endif | |
905 | .media_changed = sd_media_changed, | |
906 | .revalidate_disk = sd_revalidate_disk, | |
907 | }; | |
908 | ||
909 | /** | |
910 | * sd_rw_intr - bottom half handler: called when the lower level | |
911 | * driver has completed (successfully or otherwise) a scsi command. | |
912 | * @SCpnt: mid-level's per command structure. | |
913 | * | |
914 | * Note: potentially run from within an ISR. Must not block. | |
915 | **/ | |
916 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) | |
917 | { | |
918 | int result = SCpnt->result; | |
03aba2f7 LT |
919 | unsigned int xfer_size = SCpnt->request_bufflen; |
920 | unsigned int good_bytes = result ? 0 : xfer_size; | |
921 | u64 start_lba = SCpnt->request->sector; | |
922 | u64 bad_lba; | |
1da177e4 LT |
923 | struct scsi_sense_hdr sshdr; |
924 | int sense_valid = 0; | |
925 | int sense_deferred = 0; | |
926 | int info_valid; | |
927 | ||
928 | if (result) { | |
929 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
930 | if (sense_valid) | |
931 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
932 | } | |
1da177e4 LT |
933 | #ifdef CONFIG_SCSI_LOGGING |
934 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n", | |
935 | SCpnt->request->rq_disk->disk_name, result)); | |
936 | if (sense_valid) { | |
937 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc," | |
938 | "ascq]=%x,%x,%x,%x\n", sshdr.response_code, | |
939 | sshdr.sense_key, sshdr.asc, sshdr.ascq)); | |
940 | } | |
941 | #endif | |
03aba2f7 LT |
942 | if (driver_byte(result) != DRIVER_SENSE && |
943 | (!sense_valid || sense_deferred)) | |
944 | goto out; | |
945 | ||
946 | switch (sshdr.sense_key) { | |
947 | case HARDWARE_ERROR: | |
948 | case MEDIUM_ERROR: | |
949 | if (!blk_fs_request(SCpnt->request)) | |
950 | goto out; | |
951 | info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, | |
952 | SCSI_SENSE_BUFFERSIZE, | |
953 | &bad_lba); | |
954 | if (!info_valid) | |
955 | goto out; | |
956 | if (xfer_size <= SCpnt->device->sector_size) | |
957 | goto out; | |
958 | switch (SCpnt->device->sector_size) { | |
959 | case 256: | |
960 | start_lba <<= 1; | |
1da177e4 | 961 | break; |
03aba2f7 | 962 | case 512: |
1da177e4 | 963 | break; |
03aba2f7 LT |
964 | case 1024: |
965 | start_lba >>= 1; | |
966 | break; | |
967 | case 2048: | |
968 | start_lba >>= 2; | |
969 | break; | |
970 | case 4096: | |
971 | start_lba >>= 3; | |
1da177e4 | 972 | break; |
1da177e4 | 973 | default: |
03aba2f7 LT |
974 | /* Print something here with limiting frequency. */ |
975 | goto out; | |
1da177e4 LT |
976 | break; |
977 | } | |
03aba2f7 LT |
978 | /* This computation should always be done in terms of |
979 | * the resolution of the device's medium. | |
980 | */ | |
981 | good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; | |
982 | break; | |
983 | case RECOVERED_ERROR: | |
984 | case NO_SENSE: | |
985 | /* Inform the user, but make sure that it's not treated | |
986 | * as a hard error. | |
987 | */ | |
988 | scsi_print_sense("sd", SCpnt); | |
989 | SCpnt->result = 0; | |
990 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
991 | good_bytes = xfer_size; | |
992 | break; | |
993 | case ILLEGAL_REQUEST: | |
994 | if (SCpnt->device->use_10_for_rw && | |
995 | (SCpnt->cmnd[0] == READ_10 || | |
996 | SCpnt->cmnd[0] == WRITE_10)) | |
997 | SCpnt->device->use_10_for_rw = 0; | |
998 | if (SCpnt->device->use_10_for_ms && | |
999 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
1000 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
1001 | SCpnt->device->use_10_for_ms = 0; | |
1002 | break; | |
1003 | default: | |
1004 | break; | |
1da177e4 | 1005 | } |
03aba2f7 LT |
1006 | out: |
1007 | scsi_io_completion(SCpnt, good_bytes); | |
1da177e4 LT |
1008 | } |
1009 | ||
ea73a9f2 JB |
1010 | static int media_not_present(struct scsi_disk *sdkp, |
1011 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1012 | { |
1da177e4 | 1013 | |
ea73a9f2 | 1014 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
1015 | return 0; |
1016 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
1017 | if (sshdr->sense_key != NOT_READY && |
1018 | sshdr->sense_key != UNIT_ATTENTION) | |
1019 | return 0; | |
1020 | if (sshdr->asc != 0x3A) /* medium not present */ | |
1021 | return 0; | |
1022 | ||
1da177e4 LT |
1023 | set_media_not_present(sdkp); |
1024 | return 1; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * spinup disk - called only in sd_revalidate_disk() | |
1029 | */ | |
1030 | static void | |
ea73a9f2 JB |
1031 | sd_spinup_disk(struct scsi_disk *sdkp, char *diskname) |
1032 | { | |
1da177e4 | 1033 | unsigned char cmd[10]; |
4451e472 | 1034 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1035 | int retries, spintime; |
1036 | unsigned int the_result; | |
1037 | struct scsi_sense_hdr sshdr; | |
1038 | int sense_valid = 0; | |
1039 | ||
1040 | spintime = 0; | |
1041 | ||
1042 | /* Spin up drives, as required. Only do this at boot time */ | |
1043 | /* Spinup needs to be done for module loads too. */ | |
1044 | do { | |
1045 | retries = 0; | |
1046 | ||
1047 | do { | |
1048 | cmd[0] = TEST_UNIT_READY; | |
1049 | memset((void *) &cmd[1], 0, 9); | |
1050 | ||
ea73a9f2 JB |
1051 | the_result = scsi_execute_req(sdkp->device, cmd, |
1052 | DMA_NONE, NULL, 0, | |
1053 | &sshdr, SD_TIMEOUT, | |
1054 | SD_MAX_RETRIES); | |
1da177e4 | 1055 | |
1da177e4 | 1056 | if (the_result) |
ea73a9f2 | 1057 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1058 | retries++; |
1059 | } while (retries < 3 && | |
1060 | (!scsi_status_is_good(the_result) || | |
1061 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1062 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1063 | ||
1064 | /* | |
1065 | * If the drive has indicated to us that it doesn't have | |
1066 | * any media in it, don't bother with any of the rest of | |
1067 | * this crap. | |
1068 | */ | |
ea73a9f2 | 1069 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1070 | return; |
1071 | ||
1072 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { | |
1073 | /* no sense, TUR either succeeded or failed | |
1074 | * with a status error */ | |
1075 | if(!spintime && !scsi_status_is_good(the_result)) | |
1076 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1077 | "error = 0x%x\n", diskname, the_result); | |
1078 | break; | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * The device does not want the automatic start to be issued. | |
1083 | */ | |
1084 | if (sdkp->device->no_start_on_add) { | |
1085 | break; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * If manual intervention is required, or this is an | |
1090 | * absent USB storage device, a spinup is meaningless. | |
1091 | */ | |
1092 | if (sense_valid && | |
1093 | sshdr.sense_key == NOT_READY && | |
1094 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1095 | break; /* manual intervention required */ | |
1096 | ||
1097 | /* | |
1098 | * Issue command to spin up drive when not ready | |
1099 | */ | |
1100 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1101 | if (!spintime) { | |
1102 | printk(KERN_NOTICE "%s: Spinning up disk...", | |
1103 | diskname); | |
1104 | cmd[0] = START_STOP; | |
1105 | cmd[1] = 1; /* Return immediately */ | |
1106 | memset((void *) &cmd[2], 0, 8); | |
1107 | cmd[4] = 1; /* Start spin cycle */ | |
ea73a9f2 JB |
1108 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1109 | NULL, 0, &sshdr, | |
1110 | SD_TIMEOUT, SD_MAX_RETRIES); | |
4451e472 AS |
1111 | spintime_expire = jiffies + 100 * HZ; |
1112 | spintime = 1; | |
1da177e4 | 1113 | } |
1da177e4 LT |
1114 | /* Wait 1 second for next try */ |
1115 | msleep(1000); | |
1116 | printk("."); | |
4451e472 AS |
1117 | |
1118 | /* | |
1119 | * Wait for USB flash devices with slow firmware. | |
1120 | * Yes, this sense key/ASC combination shouldn't | |
1121 | * occur here. It's characteristic of these devices. | |
1122 | */ | |
1123 | } else if (sense_valid && | |
1124 | sshdr.sense_key == UNIT_ATTENTION && | |
1125 | sshdr.asc == 0x28) { | |
1126 | if (!spintime) { | |
1127 | spintime_expire = jiffies + 5 * HZ; | |
1128 | spintime = 1; | |
1129 | } | |
1130 | /* Wait 1 second for next try */ | |
1131 | msleep(1000); | |
1da177e4 LT |
1132 | } else { |
1133 | /* we don't understand the sense code, so it's | |
1134 | * probably pointless to loop */ | |
1135 | if(!spintime) { | |
1136 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1137 | "sense:\n", diskname); | |
ea73a9f2 | 1138 | scsi_print_sense_hdr("", &sshdr); |
1da177e4 LT |
1139 | } |
1140 | break; | |
1141 | } | |
1142 | ||
4451e472 | 1143 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1144 | |
1145 | if (spintime) { | |
1146 | if (scsi_status_is_good(the_result)) | |
1147 | printk("ready\n"); | |
1148 | else | |
1149 | printk("not responding...\n"); | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * read disk capacity | |
1155 | */ | |
1156 | static void | |
1157 | sd_read_capacity(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 JB |
1158 | unsigned char *buffer) |
1159 | { | |
1da177e4 | 1160 | unsigned char cmd[16]; |
1da177e4 LT |
1161 | int the_result, retries; |
1162 | int sector_size = 0; | |
1163 | int longrc = 0; | |
1164 | struct scsi_sense_hdr sshdr; | |
1165 | int sense_valid = 0; | |
ea73a9f2 | 1166 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1167 | |
1168 | repeat: | |
1169 | retries = 3; | |
1170 | do { | |
1171 | if (longrc) { | |
1172 | memset((void *) cmd, 0, 16); | |
1173 | cmd[0] = SERVICE_ACTION_IN; | |
1174 | cmd[1] = SAI_READ_CAPACITY_16; | |
1175 | cmd[13] = 12; | |
1176 | memset((void *) buffer, 0, 12); | |
1177 | } else { | |
1178 | cmd[0] = READ_CAPACITY; | |
1179 | memset((void *) &cmd[1], 0, 9); | |
1180 | memset((void *) buffer, 0, 8); | |
1181 | } | |
1182 | ||
ea73a9f2 JB |
1183 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
1184 | buffer, longrc ? 12 : 8, &sshdr, | |
1185 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1da177e4 | 1186 | |
ea73a9f2 | 1187 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1188 | return; |
1189 | ||
1da177e4 | 1190 | if (the_result) |
ea73a9f2 | 1191 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1192 | retries--; |
1193 | ||
1194 | } while (the_result && retries); | |
1195 | ||
1196 | if (the_result && !longrc) { | |
1197 | printk(KERN_NOTICE "%s : READ CAPACITY failed.\n" | |
1198 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1199 | diskname, diskname, | |
1200 | status_byte(the_result), | |
1201 | msg_byte(the_result), | |
1202 | host_byte(the_result), | |
1203 | driver_byte(the_result)); | |
1204 | ||
1205 | if (driver_byte(the_result) & DRIVER_SENSE) | |
ea73a9f2 | 1206 | scsi_print_sense_hdr("sd", &sshdr); |
1da177e4 LT |
1207 | else |
1208 | printk("%s : sense not available. \n", diskname); | |
1209 | ||
1210 | /* Set dirty bit for removable devices if not ready - | |
1211 | * sometimes drives will not report this properly. */ | |
1212 | if (sdp->removable && | |
1213 | sense_valid && sshdr.sense_key == NOT_READY) | |
1214 | sdp->changed = 1; | |
1215 | ||
1216 | /* Either no media are present but the drive didn't tell us, | |
1217 | or they are present but the read capacity command fails */ | |
1218 | /* sdkp->media_present = 0; -- not always correct */ | |
1219 | sdkp->capacity = 0x200000; /* 1 GB - random */ | |
1220 | ||
1221 | return; | |
1222 | } else if (the_result && longrc) { | |
1223 | /* READ CAPACITY(16) has been failed */ | |
1224 | printk(KERN_NOTICE "%s : READ CAPACITY(16) failed.\n" | |
1225 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1226 | diskname, diskname, | |
1227 | status_byte(the_result), | |
1228 | msg_byte(the_result), | |
1229 | host_byte(the_result), | |
1230 | driver_byte(the_result)); | |
1231 | printk(KERN_NOTICE "%s : use 0xffffffff as device size\n", | |
1232 | diskname); | |
1233 | ||
1234 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1235 | goto got_data; | |
1236 | } | |
1237 | ||
1238 | if (!longrc) { | |
1239 | sector_size = (buffer[4] << 24) | | |
1240 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1241 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1242 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1243 | if(sizeof(sdkp->capacity) > 4) { | |
1244 | printk(KERN_NOTICE "%s : very big device. try to use" | |
1245 | " READ CAPACITY(16).\n", diskname); | |
1246 | longrc = 1; | |
1247 | goto repeat; | |
1248 | } | |
1249 | printk(KERN_ERR "%s: too big for this kernel. Use a " | |
1250 | "kernel compiled with support for large block " | |
1251 | "devices.\n", diskname); | |
1252 | sdkp->capacity = 0; | |
1253 | goto got_data; | |
1254 | } | |
1255 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1256 | (buffer[1] << 16) | | |
1257 | (buffer[2] << 8) | | |
1258 | buffer[3]); | |
1259 | } else { | |
1260 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1261 | ((u64)buffer[1] << 48) | | |
1262 | ((u64)buffer[2] << 40) | | |
1263 | ((u64)buffer[3] << 32) | | |
1264 | ((sector_t)buffer[4] << 24) | | |
1265 | ((sector_t)buffer[5] << 16) | | |
1266 | ((sector_t)buffer[6] << 8) | | |
1267 | (sector_t)buffer[7]); | |
1268 | ||
1269 | sector_size = (buffer[8] << 24) | | |
1270 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
1271 | } | |
1272 | ||
1273 | /* Some devices return the total number of sectors, not the | |
1274 | * highest sector number. Make the necessary adjustment. */ | |
1275 | if (sdp->fix_capacity) | |
1276 | --sdkp->capacity; | |
1277 | ||
1278 | got_data: | |
1279 | if (sector_size == 0) { | |
1280 | sector_size = 512; | |
1281 | printk(KERN_NOTICE "%s : sector size 0 reported, " | |
1282 | "assuming 512.\n", diskname); | |
1283 | } | |
1284 | ||
1285 | if (sector_size != 512 && | |
1286 | sector_size != 1024 && | |
1287 | sector_size != 2048 && | |
1288 | sector_size != 4096 && | |
1289 | sector_size != 256) { | |
1290 | printk(KERN_NOTICE "%s : unsupported sector size " | |
1291 | "%d.\n", diskname, sector_size); | |
1292 | /* | |
1293 | * The user might want to re-format the drive with | |
1294 | * a supported sectorsize. Once this happens, it | |
1295 | * would be relatively trivial to set the thing up. | |
1296 | * For this reason, we leave the thing in the table. | |
1297 | */ | |
1298 | sdkp->capacity = 0; | |
1299 | /* | |
1300 | * set a bogus sector size so the normal read/write | |
1301 | * logic in the block layer will eventually refuse any | |
1302 | * request on this device without tripping over power | |
1303 | * of two sector size assumptions | |
1304 | */ | |
1305 | sector_size = 512; | |
1306 | } | |
1307 | { | |
1308 | /* | |
1309 | * The msdos fs needs to know the hardware sector size | |
1310 | * So I have created this table. See ll_rw_blk.c | |
1311 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1312 | */ | |
1313 | int hard_sector = sector_size; | |
7a691bd3 | 1314 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
1da177e4 | 1315 | request_queue_t *queue = sdp->request_queue; |
7a691bd3 | 1316 | sector_t mb = sz; |
1da177e4 LT |
1317 | |
1318 | blk_queue_hardsect_size(queue, hard_sector); | |
1319 | /* avoid 64-bit division on 32-bit platforms */ | |
7a691bd3 | 1320 | sector_div(sz, 625); |
1da177e4 LT |
1321 | mb -= sz - 974; |
1322 | sector_div(mb, 1950); | |
1323 | ||
1324 | printk(KERN_NOTICE "SCSI device %s: " | |
1325 | "%llu %d-byte hdwr sectors (%llu MB)\n", | |
1326 | diskname, (unsigned long long)sdkp->capacity, | |
1327 | hard_sector, (unsigned long long)mb); | |
1328 | } | |
1329 | ||
1330 | /* Rescale capacity to 512-byte units */ | |
1331 | if (sector_size == 4096) | |
1332 | sdkp->capacity <<= 3; | |
1333 | else if (sector_size == 2048) | |
1334 | sdkp->capacity <<= 2; | |
1335 | else if (sector_size == 1024) | |
1336 | sdkp->capacity <<= 1; | |
1337 | else if (sector_size == 256) | |
1338 | sdkp->capacity >>= 1; | |
1339 | ||
1340 | sdkp->device->sector_size = sector_size; | |
1341 | } | |
1342 | ||
1343 | /* called with buffer of length 512 */ | |
1344 | static inline int | |
ea73a9f2 JB |
1345 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1346 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1347 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1348 | { |
ea73a9f2 | 1349 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1350 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1351 | sshdr); |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | /* | |
1355 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1356 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1357 | */ |
1358 | static void | |
1359 | sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 JB |
1360 | unsigned char *buffer) |
1361 | { | |
1da177e4 | 1362 | int res; |
ea73a9f2 | 1363 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1364 | struct scsi_mode_data data; |
1365 | ||
1366 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1367 | if (sdp->skip_ms_page_3f) { |
1da177e4 LT |
1368 | printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname); |
1369 | return; | |
1370 | } | |
1371 | ||
ea73a9f2 JB |
1372 | if (sdp->use_192_bytes_for_3f) { |
1373 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1374 | } else { |
1375 | /* | |
1376 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1377 | * We have to start carefully: some devices hang if we ask | |
1378 | * for more than is available. | |
1379 | */ | |
ea73a9f2 | 1380 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1381 | |
1382 | /* | |
1383 | * Second attempt: ask for page 0 When only page 0 is | |
1384 | * implemented, a request for page 3F may return Sense Key | |
1385 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1386 | * CDB. | |
1387 | */ | |
1388 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1389 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1390 | |
1391 | /* | |
1392 | * Third attempt: ask 255 bytes, as we did earlier. | |
1393 | */ | |
1394 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1395 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1396 | &data, NULL); | |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | if (!scsi_status_is_good(res)) { | |
1400 | printk(KERN_WARNING | |
1401 | "%s: test WP failed, assume Write Enabled\n", diskname); | |
1402 | } else { | |
1403 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1404 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
1405 | printk(KERN_NOTICE "%s: Write Protect is %s\n", diskname, | |
1406 | sdkp->write_prot ? "on" : "off"); | |
1407 | printk(KERN_DEBUG "%s: Mode Sense: %02x %02x %02x %02x\n", | |
1408 | diskname, buffer[0], buffer[1], buffer[2], buffer[3]); | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1414 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1415 | */ |
1416 | static void | |
1417 | sd_read_cache_type(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 | 1418 | unsigned char *buffer) |
631e8a13 | 1419 | { |
1da177e4 | 1420 | int len = 0, res; |
ea73a9f2 | 1421 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1422 | |
631e8a13 AV |
1423 | int dbd; |
1424 | int modepage; | |
1da177e4 LT |
1425 | struct scsi_mode_data data; |
1426 | struct scsi_sense_hdr sshdr; | |
1427 | ||
ea73a9f2 | 1428 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1429 | goto defaults; |
1430 | ||
ea73a9f2 | 1431 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1432 | modepage = 6; |
1433 | dbd = 8; | |
1434 | } else { | |
1435 | modepage = 8; | |
1436 | dbd = 0; | |
1437 | } | |
1438 | ||
1da177e4 | 1439 | /* cautiously ask */ |
ea73a9f2 | 1440 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1441 | |
1442 | if (!scsi_status_is_good(res)) | |
1443 | goto bad_sense; | |
1444 | ||
6d73c851 AV |
1445 | if (!data.header_length) { |
1446 | modepage = 6; | |
1447 | printk(KERN_ERR "%s: missing header in MODE_SENSE response\n", | |
1448 | diskname); | |
1449 | } | |
1450 | ||
1da177e4 LT |
1451 | /* that went OK, now ask for the proper length */ |
1452 | len = data.length; | |
1453 | ||
1454 | /* | |
1455 | * We're only interested in the first three bytes, actually. | |
1456 | * But the data cache page is defined for the first 20. | |
1457 | */ | |
1458 | if (len < 3) | |
1459 | goto bad_sense; | |
1460 | if (len > 20) | |
1461 | len = 20; | |
1462 | ||
1463 | /* Take headers and block descriptors into account */ | |
1464 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1465 | if (len > SD_BUF_SIZE) |
1466 | goto bad_sense; | |
1da177e4 LT |
1467 | |
1468 | /* Get the data */ | |
ea73a9f2 | 1469 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1470 | |
1471 | if (scsi_status_is_good(res)) { | |
1da177e4 | 1472 | int ct = 0; |
631e8a13 | 1473 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1474 | |
48970800 AV |
1475 | if (offset >= SD_BUF_SIZE - 2) { |
1476 | printk(KERN_ERR "%s: malformed MODE SENSE response", | |
1477 | diskname); | |
1478 | goto defaults; | |
1479 | } | |
1480 | ||
631e8a13 AV |
1481 | if ((buffer[offset] & 0x3f) != modepage) { |
1482 | printk(KERN_ERR "%s: got wrong page\n", diskname); | |
1483 | goto defaults; | |
1484 | } | |
1485 | ||
1486 | if (modepage == 8) { | |
1487 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1488 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1489 | } else { | |
1490 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1491 | sdkp->RCD = 0; | |
1492 | } | |
1da177e4 | 1493 | |
007365ad TH |
1494 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1495 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
1496 | printk(KERN_NOTICE "SCSI device %s: uses " | |
1497 | "READ/WRITE(6), disabling FUA\n", diskname); | |
1498 | sdkp->DPOFUA = 0; | |
1499 | } | |
1500 | ||
1da177e4 LT |
1501 | ct = sdkp->RCD + 2*sdkp->WCE; |
1502 | ||
007365ad | 1503 | printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n", |
6bdaa1f1 | 1504 | diskname, sd_cache_types[ct], |
007365ad | 1505 | sdkp->DPOFUA ? " w/ FUA" : ""); |
1da177e4 LT |
1506 | |
1507 | return; | |
1508 | } | |
1509 | ||
1510 | bad_sense: | |
ea73a9f2 | 1511 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1512 | sshdr.sense_key == ILLEGAL_REQUEST && |
1513 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
1514 | printk(KERN_NOTICE "%s: cache data unavailable\n", | |
1515 | diskname); /* Invalid field in CDB */ | |
1516 | else | |
1517 | printk(KERN_ERR "%s: asking for cache data failed\n", | |
1518 | diskname); | |
1519 | ||
1520 | defaults: | |
1521 | printk(KERN_ERR "%s: assuming drive cache: write through\n", | |
1522 | diskname); | |
1523 | sdkp->WCE = 0; | |
1524 | sdkp->RCD = 0; | |
48970800 | 1525 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | /** | |
1529 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1530 | * performs disk spin up, read_capacity, etc. | |
1531 | * @disk: struct gendisk we care about | |
1532 | **/ | |
1533 | static int sd_revalidate_disk(struct gendisk *disk) | |
1534 | { | |
1535 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1536 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1537 | unsigned char *buffer; |
461d4e90 | 1538 | unsigned ordered; |
1da177e4 LT |
1539 | |
1540 | SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); | |
1541 | ||
1542 | /* | |
1543 | * If the device is offline, don't try and read capacity or any | |
1544 | * of the other niceties. | |
1545 | */ | |
1546 | if (!scsi_device_online(sdp)) | |
1547 | goto out; | |
1548 | ||
48970800 | 1549 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA); |
1da177e4 LT |
1550 | if (!buffer) { |
1551 | printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation " | |
1552 | "failure.\n"); | |
ea73a9f2 | 1553 | goto out; |
1da177e4 LT |
1554 | } |
1555 | ||
1556 | /* defaults, until the device tells us otherwise */ | |
1557 | sdp->sector_size = 512; | |
1558 | sdkp->capacity = 0; | |
1559 | sdkp->media_present = 1; | |
1560 | sdkp->write_prot = 0; | |
1561 | sdkp->WCE = 0; | |
1562 | sdkp->RCD = 0; | |
1563 | ||
ea73a9f2 | 1564 | sd_spinup_disk(sdkp, disk->disk_name); |
1da177e4 LT |
1565 | |
1566 | /* | |
1567 | * Without media there is no reason to ask; moreover, some devices | |
1568 | * react badly if we do. | |
1569 | */ | |
1570 | if (sdkp->media_present) { | |
ea73a9f2 | 1571 | sd_read_capacity(sdkp, disk->disk_name, buffer); |
38d76df2 | 1572 | sd_read_write_protect_flag(sdkp, disk->disk_name, buffer); |
ea73a9f2 | 1573 | sd_read_cache_type(sdkp, disk->disk_name, buffer); |
1da177e4 | 1574 | } |
461d4e90 TH |
1575 | |
1576 | /* | |
1577 | * We now have all cache related info, determine how we deal | |
1578 | * with ordered requests. Note that as the current SCSI | |
1579 | * dispatch function can alter request order, we cannot use | |
1580 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1581 | */ | |
1582 | if (sdkp->WCE) | |
007365ad TH |
1583 | ordered = sdkp->DPOFUA |
1584 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1585 | else |
1586 | ordered = QUEUE_ORDERED_DRAIN; | |
1587 | ||
1588 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1589 | ||
1da177e4 LT |
1590 | set_capacity(disk, sdkp->capacity); |
1591 | kfree(buffer); | |
1592 | ||
1da177e4 LT |
1593 | out: |
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * sd_probe - called during driver initialization and whenever a | |
1599 | * new scsi device is attached to the system. It is called once | |
1600 | * for each scsi device (not just disks) present. | |
1601 | * @dev: pointer to device object | |
1602 | * | |
1603 | * Returns 0 if successful (or not interested in this scsi device | |
1604 | * (e.g. scanner)); 1 when there is an error. | |
1605 | * | |
1606 | * Note: this function is invoked from the scsi mid-level. | |
1607 | * This function sets up the mapping between a given | |
1608 | * <host,channel,id,lun> (found in sdp) and new device name | |
1609 | * (e.g. /dev/sda). More precisely it is the block device major | |
1610 | * and minor number that is chosen here. | |
1611 | * | |
1612 | * Assume sd_attach is not re-entrant (for time being) | |
1613 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1614 | **/ | |
1615 | static int sd_probe(struct device *dev) | |
1616 | { | |
1617 | struct scsi_device *sdp = to_scsi_device(dev); | |
1618 | struct scsi_disk *sdkp; | |
1619 | struct gendisk *gd; | |
1620 | u32 index; | |
1621 | int error; | |
1622 | ||
1623 | error = -ENODEV; | |
631e8a13 | 1624 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1625 | goto out; |
1626 | ||
9ccfc756 JB |
1627 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1628 | "sd_attach\n")); | |
1da177e4 LT |
1629 | |
1630 | error = -ENOMEM; | |
24669f75 | 1631 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1632 | if (!sdkp) |
1633 | goto out; | |
1634 | ||
1da177e4 LT |
1635 | gd = alloc_disk(16); |
1636 | if (!gd) | |
1637 | goto out_free; | |
1638 | ||
1639 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) | |
1640 | goto out_put; | |
1641 | ||
1642 | spin_lock(&sd_index_lock); | |
1643 | error = idr_get_new(&sd_index_idr, NULL, &index); | |
1644 | spin_unlock(&sd_index_lock); | |
1645 | ||
1646 | if (index >= SD_MAX_DISKS) | |
1647 | error = -EBUSY; | |
1648 | if (error) | |
1649 | goto out_put; | |
1650 | ||
6bdaa1f1 JB |
1651 | class_device_initialize(&sdkp->cdev); |
1652 | sdkp->cdev.dev = &sdp->sdev_gendev; | |
1653 | sdkp->cdev.class = &sd_disk_class; | |
1654 | strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); | |
1655 | ||
1656 | if (class_device_add(&sdkp->cdev)) | |
1657 | goto out_put; | |
1658 | ||
39b7f1e2 | 1659 | get_device(&sdp->sdev_gendev); |
6bdaa1f1 | 1660 | |
1da177e4 LT |
1661 | sdkp->device = sdp; |
1662 | sdkp->driver = &sd_template; | |
1663 | sdkp->disk = gd; | |
1664 | sdkp->index = index; | |
1665 | sdkp->openers = 0; | |
1666 | ||
1667 | if (!sdp->timeout) { | |
631e8a13 | 1668 | if (sdp->type != TYPE_MOD) |
1da177e4 LT |
1669 | sdp->timeout = SD_TIMEOUT; |
1670 | else | |
1671 | sdp->timeout = SD_MOD_TIMEOUT; | |
1672 | } | |
1673 | ||
1674 | gd->major = sd_major((index & 0xf0) >> 4); | |
1675 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1676 | gd->minors = 16; | |
1677 | gd->fops = &sd_fops; | |
1678 | ||
1679 | if (index < 26) { | |
1680 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1681 | } else if (index < (26 + 1) * 26) { | |
1682 | sprintf(gd->disk_name, "sd%c%c", | |
1683 | 'a' + index / 26 - 1,'a' + index % 26); | |
1684 | } else { | |
1685 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1686 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1687 | const unsigned int m3 = index % 26; | |
1688 | sprintf(gd->disk_name, "sd%c%c%c", | |
1689 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1690 | } | |
1691 | ||
1da177e4 | 1692 | gd->private_data = &sdkp->driver; |
461d4e90 | 1693 | gd->queue = sdkp->device->request_queue; |
1da177e4 LT |
1694 | |
1695 | sd_revalidate_disk(gd); | |
1696 | ||
1697 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1698 | gd->flags = GENHD_FL_DRIVERFS; | |
1699 | if (sdp->removable) | |
1700 | gd->flags |= GENHD_FL_REMOVABLE; | |
1da177e4 LT |
1701 | |
1702 | dev_set_drvdata(dev, sdkp); | |
1703 | add_disk(gd); | |
1704 | ||
9ccfc756 JB |
1705 | sdev_printk(KERN_NOTICE, sdp, "Attached scsi %sdisk %s\n", |
1706 | sdp->removable ? "removable " : "", gd->disk_name); | |
1da177e4 LT |
1707 | |
1708 | return 0; | |
1709 | ||
6bdaa1f1 | 1710 | out_put: |
1da177e4 | 1711 | put_disk(gd); |
6bdaa1f1 | 1712 | out_free: |
1da177e4 | 1713 | kfree(sdkp); |
6bdaa1f1 | 1714 | out: |
1da177e4 LT |
1715 | return error; |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1720 | * sd_probe) is detached from the system. It is called (potentially | |
1721 | * multiple times) during sd module unload. | |
1722 | * @sdp: pointer to mid level scsi device object | |
1723 | * | |
1724 | * Note: this function is invoked from the scsi mid-level. | |
1725 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1726 | * that could be re-used by a subsequent sd_probe(). | |
1727 | * This function is not called when the built-in sd driver is "exit-ed". | |
1728 | **/ | |
1729 | static int sd_remove(struct device *dev) | |
1730 | { | |
1731 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1732 | ||
6bdaa1f1 | 1733 | class_device_del(&sdkp->cdev); |
1da177e4 LT |
1734 | del_gendisk(sdkp->disk); |
1735 | sd_shutdown(dev); | |
39b7f1e2 | 1736 | |
0b950672 | 1737 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1738 | dev_set_drvdata(dev, NULL); |
6bdaa1f1 | 1739 | class_device_put(&sdkp->cdev); |
0b950672 | 1740 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1741 | |
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * scsi_disk_release - Called to free the scsi_disk structure | |
6bdaa1f1 | 1747 | * @cdev: pointer to embedded class device |
1da177e4 | 1748 | * |
0b950672 | 1749 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1750 | * called on last put, you should always use the scsi_disk_get() |
1751 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
6bdaa1f1 | 1752 | * and never do a direct class_device_put(). |
1da177e4 | 1753 | **/ |
6bdaa1f1 | 1754 | static void scsi_disk_release(struct class_device *cdev) |
1da177e4 | 1755 | { |
6bdaa1f1 | 1756 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
1da177e4 LT |
1757 | struct gendisk *disk = sdkp->disk; |
1758 | ||
1759 | spin_lock(&sd_index_lock); | |
1760 | idr_remove(&sd_index_idr, sdkp->index); | |
1761 | spin_unlock(&sd_index_lock); | |
1762 | ||
1763 | disk->private_data = NULL; | |
1da177e4 | 1764 | put_disk(disk); |
39b7f1e2 | 1765 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
1766 | |
1767 | kfree(sdkp); | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1772 | * the normal SCSI command structure. Wait for the command to | |
1773 | * complete. | |
1774 | */ | |
1775 | static void sd_shutdown(struct device *dev) | |
1776 | { | |
1777 | struct scsi_device *sdp = to_scsi_device(dev); | |
39b7f1e2 | 1778 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
1779 | |
1780 | if (!sdkp) | |
1781 | return; /* this can happen */ | |
1782 | ||
39b7f1e2 AS |
1783 | if (sdkp->WCE) { |
1784 | printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n", | |
1785 | sdkp->disk->disk_name); | |
1786 | sd_sync_cache(sdp); | |
1787 | } | |
1788 | scsi_disk_put(sdkp); | |
1789 | } | |
1da177e4 LT |
1790 | |
1791 | /** | |
1792 | * init_sd - entry point for this driver (both when built in or when | |
1793 | * a module). | |
1794 | * | |
1795 | * Note: this function registers this driver with the scsi mid-level. | |
1796 | **/ | |
1797 | static int __init init_sd(void) | |
1798 | { | |
1799 | int majors = 0, i; | |
1800 | ||
1801 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
1802 | ||
1803 | for (i = 0; i < SD_MAJORS; i++) | |
1804 | if (register_blkdev(sd_major(i), "sd") == 0) | |
1805 | majors++; | |
1806 | ||
1807 | if (!majors) | |
1808 | return -ENODEV; | |
1809 | ||
6bdaa1f1 JB |
1810 | class_register(&sd_disk_class); |
1811 | ||
1da177e4 LT |
1812 | return scsi_register_driver(&sd_template.gendrv); |
1813 | } | |
1814 | ||
1815 | /** | |
1816 | * exit_sd - exit point for this driver (when it is a module). | |
1817 | * | |
1818 | * Note: this function unregisters this driver from the scsi mid-level. | |
1819 | **/ | |
1820 | static void __exit exit_sd(void) | |
1821 | { | |
1822 | int i; | |
1823 | ||
1824 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
1825 | ||
1826 | scsi_unregister_driver(&sd_template.gendrv); | |
1827 | for (i = 0; i < SD_MAJORS; i++) | |
1828 | unregister_blkdev(sd_major(i), "sd"); | |
6bdaa1f1 JB |
1829 | |
1830 | class_unregister(&sd_disk_class); | |
1da177e4 LT |
1831 | } |
1832 | ||
1da177e4 LT |
1833 | module_init(init_sd); |
1834 | module_exit(exit_sd); |