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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> | |
1da177e4 LT |
38 | #include <linux/mm.h> |
39 | #include <linux/bio.h> | |
40 | #include <linux/genhd.h> | |
41 | #include <linux/hdreg.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/idr.h> | |
44 | #include <linux/interrupt.h> | |
45 | #include <linux/init.h> | |
46 | #include <linux/blkdev.h> | |
47 | #include <linux/blkpg.h> | |
1da177e4 | 48 | #include <linux/delay.h> |
0b950672 | 49 | #include <linux/mutex.h> |
1da177e4 LT |
50 | #include <asm/uaccess.h> |
51 | ||
52 | #include <scsi/scsi.h> | |
53 | #include <scsi/scsi_cmnd.h> | |
54 | #include <scsi/scsi_dbg.h> | |
55 | #include <scsi/scsi_device.h> | |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_eh.h> | |
58 | #include <scsi/scsi_host.h> | |
59 | #include <scsi/scsi_ioctl.h> | |
1da177e4 | 60 | #include <scsi/scsicam.h> |
e73aec82 | 61 | #include <scsi/sd.h> |
1da177e4 LT |
62 | |
63 | #include "scsi_logging.h" | |
64 | ||
f018fa55 RH |
65 | MODULE_AUTHOR("Eric Youngdale"); |
66 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
69 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
70 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
71 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
72 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
73 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
74 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
85 | ||
1da177e4 LT |
86 | static DEFINE_IDR(sd_index_idr); |
87 | static DEFINE_SPINLOCK(sd_index_lock); | |
88 | ||
89 | /* This semaphore is used to mediate the 0->1 reference get in the | |
90 | * face of object destruction (i.e. we can't allow a get on an | |
91 | * object after last put) */ | |
0b950672 | 92 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 93 | |
6bdaa1f1 JB |
94 | static const char *sd_cache_types[] = { |
95 | "write through", "none", "write back", | |
96 | "write back, no read (daft)" | |
97 | }; | |
98 | ||
99 | static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, | |
100 | size_t count) | |
101 | { | |
102 | int i, ct = -1, rcd, wce, sp; | |
103 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
104 | struct scsi_device *sdp = sdkp->device; | |
105 | char buffer[64]; | |
106 | char *buffer_data; | |
107 | struct scsi_mode_data data; | |
108 | struct scsi_sense_hdr sshdr; | |
109 | int len; | |
110 | ||
111 | if (sdp->type != TYPE_DISK) | |
112 | /* no cache control on RBC devices; theoretically they | |
113 | * can do it, but there's probably so many exceptions | |
114 | * it's not worth the risk */ | |
115 | return -EINVAL; | |
116 | ||
6391a113 | 117 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
118 | const int len = strlen(sd_cache_types[i]); |
119 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
120 | buf[len] == '\n') { | |
121 | ct = i; | |
122 | break; | |
123 | } | |
124 | } | |
125 | if (ct < 0) | |
126 | return -EINVAL; | |
127 | rcd = ct & 0x01 ? 1 : 0; | |
128 | wce = ct & 0x02 ? 1 : 0; | |
129 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
130 | SD_MAX_RETRIES, &data, NULL)) | |
131 | return -EINVAL; | |
a9312fb8 | 132 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
133 | data.block_descriptor_length); |
134 | buffer_data = buffer + data.header_length + | |
135 | data.block_descriptor_length; | |
136 | buffer_data[2] &= ~0x05; | |
137 | buffer_data[2] |= wce << 2 | rcd; | |
138 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
139 | ||
140 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
141 | SD_MAX_RETRIES, &data, &sshdr)) { | |
142 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 143 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
144 | return -EINVAL; |
145 | } | |
146 | sd_revalidate_disk(sdkp->disk); | |
147 | return count; | |
148 | } | |
149 | ||
a144c5ae BK |
150 | static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, |
151 | size_t count) | |
152 | { | |
153 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
154 | struct scsi_device *sdp = sdkp->device; | |
155 | ||
156 | if (!capable(CAP_SYS_ADMIN)) | |
157 | return -EACCES; | |
158 | ||
159 | if (sdp->type != TYPE_DISK) | |
160 | return -EINVAL; | |
161 | ||
162 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
163 | ||
164 | return count; | |
165 | } | |
166 | ||
6bdaa1f1 JB |
167 | static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) |
168 | { | |
169 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
170 | int ct = sdkp->RCD + 2*sdkp->WCE; | |
171 | ||
172 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
173 | } | |
174 | ||
175 | static ssize_t sd_show_fua(struct class_device *cdev, char *buf) | |
176 | { | |
177 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
178 | ||
179 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
180 | } | |
181 | ||
a144c5ae BK |
182 | static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) |
183 | { | |
184 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
185 | ||
186 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
187 | } | |
188 | ||
6bdaa1f1 JB |
189 | static struct class_device_attribute sd_disk_attrs[] = { |
190 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, | |
191 | sd_store_cache_type), | |
192 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
193 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
194 | sd_store_allow_restart), | |
6bdaa1f1 JB |
195 | __ATTR_NULL, |
196 | }; | |
197 | ||
198 | static struct class sd_disk_class = { | |
199 | .name = "scsi_disk", | |
200 | .owner = THIS_MODULE, | |
201 | .release = scsi_disk_release, | |
202 | .class_dev_attrs = sd_disk_attrs, | |
203 | }; | |
1da177e4 LT |
204 | |
205 | static struct scsi_driver sd_template = { | |
206 | .owner = THIS_MODULE, | |
207 | .gendrv = { | |
208 | .name = "sd", | |
209 | .probe = sd_probe, | |
210 | .remove = sd_remove, | |
211 | .shutdown = sd_shutdown, | |
212 | }, | |
213 | .rescan = sd_rescan, | |
214 | .init_command = sd_init_command, | |
215 | .issue_flush = sd_issue_flush, | |
1da177e4 LT |
216 | }; |
217 | ||
218 | /* | |
219 | * Device no to disk mapping: | |
220 | * | |
221 | * major disc2 disc p1 | |
222 | * |............|.............|....|....| <- dev_t | |
223 | * 31 20 19 8 7 4 3 0 | |
224 | * | |
225 | * Inside a major, we have 16k disks, however mapped non- | |
226 | * contiguously. The first 16 disks are for major0, the next | |
227 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
228 | * for major1, ... | |
229 | * As we stay compatible with our numbering scheme, we can reuse | |
230 | * the well-know SCSI majors 8, 65--71, 136--143. | |
231 | */ | |
232 | static int sd_major(int major_idx) | |
233 | { | |
234 | switch (major_idx) { | |
235 | case 0: | |
236 | return SCSI_DISK0_MAJOR; | |
237 | case 1 ... 7: | |
238 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
239 | case 8 ... 15: | |
240 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
241 | default: | |
242 | BUG(); | |
243 | return 0; /* shut up gcc */ | |
244 | } | |
245 | } | |
246 | ||
1da177e4 LT |
247 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) |
248 | { | |
249 | return container_of(disk->private_data, struct scsi_disk, driver); | |
250 | } | |
251 | ||
39b7f1e2 | 252 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
253 | { |
254 | struct scsi_disk *sdkp = NULL; | |
255 | ||
39b7f1e2 AS |
256 | if (disk->private_data) { |
257 | sdkp = scsi_disk(disk); | |
258 | if (scsi_device_get(sdkp->device) == 0) | |
6bdaa1f1 | 259 | class_device_get(&sdkp->cdev); |
39b7f1e2 AS |
260 | else |
261 | sdkp = NULL; | |
262 | } | |
263 | return sdkp; | |
264 | } | |
265 | ||
266 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
267 | { | |
268 | struct scsi_disk *sdkp; | |
269 | ||
0b950672 | 270 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 271 | sdkp = __scsi_disk_get(disk); |
0b950672 | 272 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 273 | return sdkp; |
39b7f1e2 | 274 | } |
1da177e4 | 275 | |
39b7f1e2 AS |
276 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
277 | { | |
278 | struct scsi_disk *sdkp; | |
279 | ||
0b950672 | 280 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
281 | sdkp = dev_get_drvdata(dev); |
282 | if (sdkp) | |
283 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 284 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
285 | return sdkp; |
286 | } | |
287 | ||
288 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
289 | { | |
290 | struct scsi_device *sdev = sdkp->device; | |
291 | ||
0b950672 | 292 | mutex_lock(&sd_ref_mutex); |
6bdaa1f1 | 293 | class_device_put(&sdkp->cdev); |
1da177e4 | 294 | scsi_device_put(sdev); |
0b950672 | 295 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
296 | } |
297 | ||
298 | /** | |
299 | * sd_init_command - build a scsi (read or write) command from | |
300 | * information in the request structure. | |
301 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
302 | * contains request and into which the scsi command is written | |
303 | * | |
304 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
305 | **/ | |
306 | static int sd_init_command(struct scsi_cmnd * SCpnt) | |
307 | { | |
1da177e4 LT |
308 | struct scsi_device *sdp = SCpnt->device; |
309 | struct request *rq = SCpnt->request; | |
776b23a0 CH |
310 | struct gendisk *disk = rq->rq_disk; |
311 | sector_t block = rq->sector; | |
312 | unsigned int this_count = SCpnt->request_bufflen >> 9; | |
313 | unsigned int timeout = sdp->timeout; | |
1da177e4 | 314 | |
fa0d34be MP |
315 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
316 | "sd_init_command: block=%llu, " | |
317 | "count=%d\n", | |
318 | (unsigned long long)block, | |
319 | this_count)); | |
1da177e4 LT |
320 | |
321 | if (!sdp || !scsi_device_online(sdp) || | |
322 | block + rq->nr_sectors > get_capacity(disk)) { | |
fa0d34be MP |
323 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
324 | "Finishing %ld sectors\n", | |
325 | rq->nr_sectors)); | |
326 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
327 | "Retry with 0x%p\n", SCpnt)); | |
1da177e4 LT |
328 | return 0; |
329 | } | |
330 | ||
331 | if (sdp->changed) { | |
332 | /* | |
333 | * quietly refuse to do anything to a changed disc until | |
334 | * the changed bit has been reset | |
335 | */ | |
336 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
337 | return 0; | |
338 | } | |
fa0d34be MP |
339 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
340 | (unsigned long long)block)); | |
1da177e4 LT |
341 | |
342 | /* | |
343 | * If we have a 1K hardware sectorsize, prevent access to single | |
344 | * 512 byte sectors. In theory we could handle this - in fact | |
345 | * the scsi cdrom driver must be able to handle this because | |
346 | * we typically use 1K blocksizes, and cdroms typically have | |
347 | * 2K hardware sectorsizes. Of course, things are simpler | |
348 | * with the cdrom, since it is read-only. For performance | |
349 | * reasons, the filesystems should be able to handle this | |
350 | * and not force the scsi disk driver to use bounce buffers | |
351 | * for this. | |
352 | */ | |
353 | if (sdp->sector_size == 1024) { | |
354 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
e73aec82 MP |
355 | scmd_printk(KERN_ERR, SCpnt, |
356 | "Bad block number requested\n"); | |
1da177e4 LT |
357 | return 0; |
358 | } else { | |
359 | block = block >> 1; | |
360 | this_count = this_count >> 1; | |
361 | } | |
362 | } | |
363 | if (sdp->sector_size == 2048) { | |
364 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
e73aec82 MP |
365 | scmd_printk(KERN_ERR, SCpnt, |
366 | "Bad block number requested\n"); | |
1da177e4 LT |
367 | return 0; |
368 | } else { | |
369 | block = block >> 2; | |
370 | this_count = this_count >> 2; | |
371 | } | |
372 | } | |
373 | if (sdp->sector_size == 4096) { | |
374 | if ((block & 7) || (rq->nr_sectors & 7)) { | |
e73aec82 MP |
375 | scmd_printk(KERN_ERR, SCpnt, |
376 | "Bad block number requested\n"); | |
1da177e4 LT |
377 | return 0; |
378 | } else { | |
379 | block = block >> 3; | |
380 | this_count = this_count >> 3; | |
381 | } | |
382 | } | |
383 | if (rq_data_dir(rq) == WRITE) { | |
384 | if (!sdp->writeable) { | |
385 | return 0; | |
386 | } | |
387 | SCpnt->cmnd[0] = WRITE_6; | |
388 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
389 | } else if (rq_data_dir(rq) == READ) { | |
390 | SCpnt->cmnd[0] = READ_6; | |
391 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
392 | } else { | |
e73aec82 | 393 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
1da177e4 LT |
394 | return 0; |
395 | } | |
396 | ||
fa0d34be MP |
397 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
398 | "%s %d/%ld 512 byte blocks.\n", | |
399 | (rq_data_dir(rq) == WRITE) ? | |
400 | "writing" : "reading", this_count, | |
401 | rq->nr_sectors)); | |
1da177e4 LT |
402 | |
403 | SCpnt->cmnd[1] = 0; | |
404 | ||
405 | if (block > 0xffffffff) { | |
406 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 407 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
408 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
409 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
410 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
411 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
412 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
413 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
414 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
415 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
416 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
417 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
418 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
419 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
420 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
421 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
422 | SCpnt->device->use_10_for_rw) { | |
423 | if (this_count > 0xffff) | |
424 | this_count = 0xffff; | |
425 | ||
426 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 427 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
428 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
429 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
430 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
431 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
432 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
433 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
434 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
435 | } else { | |
007365ad TH |
436 | if (unlikely(blk_fua_rq(rq))) { |
437 | /* | |
438 | * This happens only if this drive failed | |
439 | * 10byte rw command with ILLEGAL_REQUEST | |
440 | * during operation and thus turned off | |
441 | * use_10_for_rw. | |
442 | */ | |
e73aec82 MP |
443 | scmd_printk(KERN_ERR, SCpnt, |
444 | "FUA write on READ/WRITE(6) drive\n"); | |
007365ad TH |
445 | return 0; |
446 | } | |
447 | ||
1da177e4 LT |
448 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
449 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
450 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
451 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
452 | SCpnt->cmnd[5] = 0; | |
453 | } | |
631c228c | 454 | SCpnt->request_bufflen = this_count * sdp->sector_size; |
1da177e4 LT |
455 | |
456 | /* | |
457 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
458 | * host adapter, it's safe to assume that we can at least transfer | |
459 | * this many bytes between each connect / disconnect. | |
460 | */ | |
461 | SCpnt->transfersize = sdp->sector_size; | |
462 | SCpnt->underflow = this_count << 9; | |
463 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 LT |
464 | SCpnt->timeout_per_command = timeout; |
465 | ||
466 | /* | |
467 | * This is the completion routine we use. This is matched in terms | |
468 | * of capability to this function. | |
469 | */ | |
470 | SCpnt->done = sd_rw_intr; | |
471 | ||
472 | /* | |
473 | * This indicates that the command is ready from our end to be | |
474 | * queued. | |
475 | */ | |
476 | return 1; | |
477 | } | |
478 | ||
479 | /** | |
480 | * sd_open - open a scsi disk device | |
481 | * @inode: only i_rdev member may be used | |
482 | * @filp: only f_mode and f_flags may be used | |
483 | * | |
484 | * Returns 0 if successful. Returns a negated errno value in case | |
485 | * of error. | |
486 | * | |
487 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
488 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
489 | * In the latter case @inode and @filp carry an abridged amount | |
490 | * of information as noted above. | |
491 | **/ | |
492 | static int sd_open(struct inode *inode, struct file *filp) | |
493 | { | |
494 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
495 | struct scsi_disk *sdkp; | |
496 | struct scsi_device *sdev; | |
497 | int retval; | |
498 | ||
499 | if (!(sdkp = scsi_disk_get(disk))) | |
500 | return -ENXIO; | |
501 | ||
502 | ||
fa0d34be | 503 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
504 | |
505 | sdev = sdkp->device; | |
506 | ||
507 | /* | |
508 | * If the device is in error recovery, wait until it is done. | |
509 | * If the device is offline, then disallow any access to it. | |
510 | */ | |
511 | retval = -ENXIO; | |
512 | if (!scsi_block_when_processing_errors(sdev)) | |
513 | goto error_out; | |
514 | ||
515 | if (sdev->removable || sdkp->write_prot) | |
516 | check_disk_change(inode->i_bdev); | |
517 | ||
518 | /* | |
519 | * If the drive is empty, just let the open fail. | |
520 | */ | |
521 | retval = -ENOMEDIUM; | |
522 | if (sdev->removable && !sdkp->media_present && | |
523 | !(filp->f_flags & O_NDELAY)) | |
524 | goto error_out; | |
525 | ||
526 | /* | |
527 | * If the device has the write protect tab set, have the open fail | |
528 | * if the user expects to be able to write to the thing. | |
529 | */ | |
530 | retval = -EROFS; | |
531 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
532 | goto error_out; | |
533 | ||
534 | /* | |
535 | * It is possible that the disk changing stuff resulted in | |
536 | * the device being taken offline. If this is the case, | |
537 | * report this to the user, and don't pretend that the | |
538 | * open actually succeeded. | |
539 | */ | |
540 | retval = -ENXIO; | |
541 | if (!scsi_device_online(sdev)) | |
542 | goto error_out; | |
543 | ||
544 | if (!sdkp->openers++ && sdev->removable) { | |
545 | if (scsi_block_when_processing_errors(sdev)) | |
546 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
547 | } | |
548 | ||
549 | return 0; | |
550 | ||
551 | error_out: | |
552 | scsi_disk_put(sdkp); | |
553 | return retval; | |
554 | } | |
555 | ||
556 | /** | |
557 | * sd_release - invoked when the (last) close(2) is called on this | |
558 | * scsi disk. | |
559 | * @inode: only i_rdev member may be used | |
560 | * @filp: only f_mode and f_flags may be used | |
561 | * | |
562 | * Returns 0. | |
563 | * | |
564 | * Note: may block (uninterruptible) if error recovery is underway | |
565 | * on this disk. | |
566 | **/ | |
567 | static int sd_release(struct inode *inode, struct file *filp) | |
568 | { | |
569 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
570 | struct scsi_disk *sdkp = scsi_disk(disk); | |
571 | struct scsi_device *sdev = sdkp->device; | |
572 | ||
fa0d34be | 573 | SCSI_LOG_HLQUEUE(3, sdkp_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
574 | |
575 | if (!--sdkp->openers && sdev->removable) { | |
576 | if (scsi_block_when_processing_errors(sdev)) | |
577 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
578 | } | |
579 | ||
580 | /* | |
581 | * XXX and what if there are packets in flight and this close() | |
582 | * XXX is followed by a "rmmod sd_mod"? | |
583 | */ | |
584 | scsi_disk_put(sdkp); | |
585 | return 0; | |
586 | } | |
587 | ||
a885c8c4 | 588 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
589 | { |
590 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
591 | struct scsi_device *sdp = sdkp->device; | |
592 | struct Scsi_Host *host = sdp->host; | |
593 | int diskinfo[4]; | |
594 | ||
595 | /* default to most commonly used values */ | |
596 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
597 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
598 | diskinfo[2] = sdkp->capacity >> 11; | |
599 | ||
600 | /* override with calculated, extended default, or driver values */ | |
601 | if (host->hostt->bios_param) | |
602 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
603 | else | |
604 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
605 | ||
a885c8c4 CH |
606 | geo->heads = diskinfo[0]; |
607 | geo->sectors = diskinfo[1]; | |
608 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
609 | return 0; |
610 | } | |
611 | ||
612 | /** | |
613 | * sd_ioctl - process an ioctl | |
614 | * @inode: only i_rdev/i_bdev members may be used | |
615 | * @filp: only f_mode and f_flags may be used | |
616 | * @cmd: ioctl command number | |
617 | * @arg: this is third argument given to ioctl(2) system call. | |
618 | * Often contains a pointer. | |
619 | * | |
620 | * Returns 0 if successful (some ioctls return postive numbers on | |
621 | * success as well). Returns a negated errno value in case of error. | |
622 | * | |
623 | * Note: most ioctls are forward onto the block subsystem or further | |
624 | * down in the scsi subsytem. | |
625 | **/ | |
626 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
627 | unsigned int cmd, unsigned long arg) | |
628 | { | |
629 | struct block_device *bdev = inode->i_bdev; | |
630 | struct gendisk *disk = bdev->bd_disk; | |
631 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
632 | void __user *p = (void __user *)arg; | |
633 | int error; | |
634 | ||
635 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
636 | disk->disk_name, cmd)); | |
637 | ||
638 | /* | |
639 | * If we are in the middle of error recovery, don't let anyone | |
640 | * else try and use this device. Also, if error recovery fails, it | |
641 | * may try and take the device offline, in which case all further | |
642 | * access to the device is prohibited. | |
643 | */ | |
644 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); | |
645 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
646 | return error; | |
647 | ||
1da177e4 LT |
648 | /* |
649 | * Send SCSI addressing ioctls directly to mid level, send other | |
650 | * ioctls to block level and then onto mid level if they can't be | |
651 | * resolved. | |
652 | */ | |
653 | switch (cmd) { | |
654 | case SCSI_IOCTL_GET_IDLUN: | |
655 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
656 | return scsi_ioctl(sdp, cmd, p); | |
657 | default: | |
658 | error = scsi_cmd_ioctl(filp, disk, cmd, p); | |
659 | if (error != -ENOTTY) | |
660 | return error; | |
661 | } | |
662 | return scsi_ioctl(sdp, cmd, p); | |
663 | } | |
664 | ||
665 | static void set_media_not_present(struct scsi_disk *sdkp) | |
666 | { | |
667 | sdkp->media_present = 0; | |
668 | sdkp->capacity = 0; | |
669 | sdkp->device->changed = 1; | |
670 | } | |
671 | ||
672 | /** | |
673 | * sd_media_changed - check if our medium changed | |
674 | * @disk: kernel device descriptor | |
675 | * | |
676 | * Returns 0 if not applicable or no change; 1 if change | |
677 | * | |
678 | * Note: this function is invoked from the block subsystem. | |
679 | **/ | |
680 | static int sd_media_changed(struct gendisk *disk) | |
681 | { | |
682 | struct scsi_disk *sdkp = scsi_disk(disk); | |
683 | struct scsi_device *sdp = sdkp->device; | |
684 | int retval; | |
685 | ||
fa0d34be | 686 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
687 | |
688 | if (!sdp->removable) | |
689 | return 0; | |
690 | ||
691 | /* | |
692 | * If the device is offline, don't send any commands - just pretend as | |
693 | * if the command failed. If the device ever comes back online, we | |
694 | * can deal with it then. It is only because of unrecoverable errors | |
695 | * that we would ever take a device offline in the first place. | |
696 | */ | |
697 | if (!scsi_device_online(sdp)) | |
698 | goto not_present; | |
699 | ||
700 | /* | |
701 | * Using TEST_UNIT_READY enables differentiation between drive with | |
702 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
703 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
704 | * | |
705 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
706 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
707 | * sd_revalidate() is called. | |
708 | */ | |
709 | retval = -ENODEV; | |
710 | if (scsi_block_when_processing_errors(sdp)) | |
711 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); | |
712 | ||
713 | /* | |
714 | * Unable to test, unit probably not ready. This usually | |
715 | * means there is no disc in the drive. Mark as changed, | |
716 | * and we will figure it out later once the drive is | |
717 | * available again. | |
718 | */ | |
719 | if (retval) | |
720 | goto not_present; | |
721 | ||
722 | /* | |
723 | * For removable scsi disk we have to recognise the presence | |
724 | * of a disk in the drive. This is kept in the struct scsi_disk | |
725 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
726 | */ | |
727 | sdkp->media_present = 1; | |
728 | ||
729 | retval = sdp->changed; | |
730 | sdp->changed = 0; | |
731 | ||
732 | return retval; | |
733 | ||
734 | not_present: | |
735 | set_media_not_present(sdkp); | |
736 | return 1; | |
737 | } | |
738 | ||
e73aec82 | 739 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 740 | { |
1da177e4 | 741 | int retries, res; |
e73aec82 | 742 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 743 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
744 | |
745 | if (!scsi_device_online(sdp)) | |
746 | return -ENODEV; | |
747 | ||
1da177e4 | 748 | |
1da177e4 LT |
749 | for (retries = 3; retries > 0; --retries) { |
750 | unsigned char cmd[10] = { 0 }; | |
751 | ||
752 | cmd[0] = SYNCHRONIZE_CACHE; | |
753 | /* | |
754 | * Leave the rest of the command zero to indicate | |
755 | * flush everything. | |
756 | */ | |
ea73a9f2 JB |
757 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
758 | SD_TIMEOUT, SD_MAX_RETRIES); | |
759 | if (res == 0) | |
1da177e4 LT |
760 | break; |
761 | } | |
762 | ||
e73aec82 MP |
763 | if (res) { |
764 | sd_print_result(sdkp, res); | |
765 | if (driver_byte(res) & DRIVER_SENSE) | |
766 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
767 | } |
768 | ||
1da177e4 LT |
769 | return res; |
770 | } | |
771 | ||
772 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) | |
773 | { | |
39b7f1e2 | 774 | int ret = 0; |
39b7f1e2 | 775 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
776 | |
777 | if (!sdkp) | |
778 | return -ENODEV; | |
779 | ||
39b7f1e2 | 780 | if (sdkp->WCE) |
e73aec82 | 781 | ret = sd_sync_cache(sdkp); |
39b7f1e2 AS |
782 | scsi_disk_put(sdkp); |
783 | return ret; | |
1da177e4 LT |
784 | } |
785 | ||
461d4e90 | 786 | static void sd_prepare_flush(request_queue_t *q, struct request *rq) |
1da177e4 | 787 | { |
c0ed79a3 | 788 | memset(rq->cmd, 0, sizeof(rq->cmd)); |
4aff5e23 | 789 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 JB |
790 | rq->timeout = SD_TIMEOUT; |
791 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 792 | rq->cmd_len = 10; |
1da177e4 LT |
793 | } |
794 | ||
795 | static void sd_rescan(struct device *dev) | |
796 | { | |
39b7f1e2 AS |
797 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
798 | ||
799 | if (sdkp) { | |
800 | sd_revalidate_disk(sdkp->disk); | |
801 | scsi_disk_put(sdkp); | |
802 | } | |
1da177e4 LT |
803 | } |
804 | ||
805 | ||
806 | #ifdef CONFIG_COMPAT | |
807 | /* | |
808 | * This gets directly called from VFS. When the ioctl | |
809 | * is not recognized we go back to the other translation paths. | |
810 | */ | |
811 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
812 | { | |
7ac6207b | 813 | struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; |
1da177e4 LT |
814 | struct gendisk *disk = bdev->bd_disk; |
815 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
816 | ||
817 | /* | |
818 | * If we are in the middle of error recovery, don't let anyone | |
819 | * else try and use this device. Also, if error recovery fails, it | |
820 | * may try and take the device offline, in which case all further | |
821 | * access to the device is prohibited. | |
822 | */ | |
823 | if (!scsi_block_when_processing_errors(sdev)) | |
824 | return -ENODEV; | |
825 | ||
826 | if (sdev->host->hostt->compat_ioctl) { | |
827 | int ret; | |
828 | ||
829 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
830 | ||
831 | return ret; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Let the static ioctl translation table take care of it. | |
836 | */ | |
837 | return -ENOIOCTLCMD; | |
838 | } | |
839 | #endif | |
840 | ||
841 | static struct block_device_operations sd_fops = { | |
842 | .owner = THIS_MODULE, | |
843 | .open = sd_open, | |
844 | .release = sd_release, | |
845 | .ioctl = sd_ioctl, | |
a885c8c4 | 846 | .getgeo = sd_getgeo, |
1da177e4 LT |
847 | #ifdef CONFIG_COMPAT |
848 | .compat_ioctl = sd_compat_ioctl, | |
849 | #endif | |
850 | .media_changed = sd_media_changed, | |
851 | .revalidate_disk = sd_revalidate_disk, | |
852 | }; | |
853 | ||
854 | /** | |
855 | * sd_rw_intr - bottom half handler: called when the lower level | |
856 | * driver has completed (successfully or otherwise) a scsi command. | |
857 | * @SCpnt: mid-level's per command structure. | |
858 | * | |
859 | * Note: potentially run from within an ISR. Must not block. | |
860 | **/ | |
861 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) | |
862 | { | |
863 | int result = SCpnt->result; | |
03aba2f7 LT |
864 | unsigned int xfer_size = SCpnt->request_bufflen; |
865 | unsigned int good_bytes = result ? 0 : xfer_size; | |
866 | u64 start_lba = SCpnt->request->sector; | |
867 | u64 bad_lba; | |
1da177e4 LT |
868 | struct scsi_sense_hdr sshdr; |
869 | int sense_valid = 0; | |
870 | int sense_deferred = 0; | |
871 | int info_valid; | |
872 | ||
873 | if (result) { | |
874 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
875 | if (sense_valid) | |
876 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
877 | } | |
1da177e4 | 878 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 879 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 880 | if (sense_valid) { |
fa0d34be MP |
881 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
882 | "sd_rw_intr: sb[respc,sk,asc," | |
883 | "ascq]=%x,%x,%x,%x\n", | |
884 | sshdr.response_code, | |
885 | sshdr.sense_key, sshdr.asc, | |
886 | sshdr.ascq)); | |
1da177e4 LT |
887 | } |
888 | #endif | |
03aba2f7 LT |
889 | if (driver_byte(result) != DRIVER_SENSE && |
890 | (!sense_valid || sense_deferred)) | |
891 | goto out; | |
892 | ||
893 | switch (sshdr.sense_key) { | |
894 | case HARDWARE_ERROR: | |
895 | case MEDIUM_ERROR: | |
896 | if (!blk_fs_request(SCpnt->request)) | |
897 | goto out; | |
898 | info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, | |
899 | SCSI_SENSE_BUFFERSIZE, | |
900 | &bad_lba); | |
901 | if (!info_valid) | |
902 | goto out; | |
903 | if (xfer_size <= SCpnt->device->sector_size) | |
904 | goto out; | |
905 | switch (SCpnt->device->sector_size) { | |
906 | case 256: | |
907 | start_lba <<= 1; | |
1da177e4 | 908 | break; |
03aba2f7 | 909 | case 512: |
1da177e4 | 910 | break; |
03aba2f7 LT |
911 | case 1024: |
912 | start_lba >>= 1; | |
913 | break; | |
914 | case 2048: | |
915 | start_lba >>= 2; | |
916 | break; | |
917 | case 4096: | |
918 | start_lba >>= 3; | |
1da177e4 | 919 | break; |
1da177e4 | 920 | default: |
03aba2f7 LT |
921 | /* Print something here with limiting frequency. */ |
922 | goto out; | |
1da177e4 LT |
923 | break; |
924 | } | |
03aba2f7 LT |
925 | /* This computation should always be done in terms of |
926 | * the resolution of the device's medium. | |
927 | */ | |
928 | good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; | |
929 | break; | |
930 | case RECOVERED_ERROR: | |
931 | case NO_SENSE: | |
932 | /* Inform the user, but make sure that it's not treated | |
933 | * as a hard error. | |
934 | */ | |
935 | scsi_print_sense("sd", SCpnt); | |
936 | SCpnt->result = 0; | |
937 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
938 | good_bytes = xfer_size; | |
939 | break; | |
940 | case ILLEGAL_REQUEST: | |
941 | if (SCpnt->device->use_10_for_rw && | |
942 | (SCpnt->cmnd[0] == READ_10 || | |
943 | SCpnt->cmnd[0] == WRITE_10)) | |
944 | SCpnt->device->use_10_for_rw = 0; | |
945 | if (SCpnt->device->use_10_for_ms && | |
946 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
947 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
948 | SCpnt->device->use_10_for_ms = 0; | |
949 | break; | |
950 | default: | |
951 | break; | |
1da177e4 | 952 | } |
03aba2f7 LT |
953 | out: |
954 | scsi_io_completion(SCpnt, good_bytes); | |
1da177e4 LT |
955 | } |
956 | ||
ea73a9f2 JB |
957 | static int media_not_present(struct scsi_disk *sdkp, |
958 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 959 | { |
1da177e4 | 960 | |
ea73a9f2 | 961 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
962 | return 0; |
963 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
964 | if (sshdr->sense_key != NOT_READY && |
965 | sshdr->sense_key != UNIT_ATTENTION) | |
966 | return 0; | |
967 | if (sshdr->asc != 0x3A) /* medium not present */ | |
968 | return 0; | |
969 | ||
1da177e4 LT |
970 | set_media_not_present(sdkp); |
971 | return 1; | |
972 | } | |
973 | ||
974 | /* | |
975 | * spinup disk - called only in sd_revalidate_disk() | |
976 | */ | |
977 | static void | |
e73aec82 | 978 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 979 | { |
1da177e4 | 980 | unsigned char cmd[10]; |
4451e472 | 981 | unsigned long spintime_expire = 0; |
1da177e4 LT |
982 | int retries, spintime; |
983 | unsigned int the_result; | |
984 | struct scsi_sense_hdr sshdr; | |
985 | int sense_valid = 0; | |
986 | ||
987 | spintime = 0; | |
988 | ||
989 | /* Spin up drives, as required. Only do this at boot time */ | |
990 | /* Spinup needs to be done for module loads too. */ | |
991 | do { | |
992 | retries = 0; | |
993 | ||
994 | do { | |
995 | cmd[0] = TEST_UNIT_READY; | |
996 | memset((void *) &cmd[1], 0, 9); | |
997 | ||
ea73a9f2 JB |
998 | the_result = scsi_execute_req(sdkp->device, cmd, |
999 | DMA_NONE, NULL, 0, | |
1000 | &sshdr, SD_TIMEOUT, | |
1001 | SD_MAX_RETRIES); | |
1da177e4 | 1002 | |
b4d38e38 AS |
1003 | /* |
1004 | * If the drive has indicated to us that it | |
1005 | * doesn't have any media in it, don't bother | |
1006 | * with any more polling. | |
1007 | */ | |
1008 | if (media_not_present(sdkp, &sshdr)) | |
1009 | return; | |
1010 | ||
1da177e4 | 1011 | if (the_result) |
ea73a9f2 | 1012 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1013 | retries++; |
1014 | } while (retries < 3 && | |
1015 | (!scsi_status_is_good(the_result) || | |
1016 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1017 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1018 | ||
1da177e4 LT |
1019 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1020 | /* no sense, TUR either succeeded or failed | |
1021 | * with a status error */ | |
e73aec82 MP |
1022 | if(!spintime && !scsi_status_is_good(the_result)) { |
1023 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1024 | sd_print_result(sdkp, the_result); | |
1025 | } | |
1da177e4 LT |
1026 | break; |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * The device does not want the automatic start to be issued. | |
1031 | */ | |
1032 | if (sdkp->device->no_start_on_add) { | |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * If manual intervention is required, or this is an | |
1038 | * absent USB storage device, a spinup is meaningless. | |
1039 | */ | |
1040 | if (sense_valid && | |
1041 | sshdr.sense_key == NOT_READY && | |
1042 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1043 | break; /* manual intervention required */ | |
1044 | ||
1045 | /* | |
1046 | * Issue command to spin up drive when not ready | |
1047 | */ | |
1048 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1049 | if (!spintime) { | |
e73aec82 | 1050 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1051 | cmd[0] = START_STOP; |
1052 | cmd[1] = 1; /* Return immediately */ | |
1053 | memset((void *) &cmd[2], 0, 8); | |
1054 | cmd[4] = 1; /* Start spin cycle */ | |
ea73a9f2 JB |
1055 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1056 | NULL, 0, &sshdr, | |
1057 | SD_TIMEOUT, SD_MAX_RETRIES); | |
4451e472 AS |
1058 | spintime_expire = jiffies + 100 * HZ; |
1059 | spintime = 1; | |
1da177e4 | 1060 | } |
1da177e4 LT |
1061 | /* Wait 1 second for next try */ |
1062 | msleep(1000); | |
1063 | printk("."); | |
4451e472 AS |
1064 | |
1065 | /* | |
1066 | * Wait for USB flash devices with slow firmware. | |
1067 | * Yes, this sense key/ASC combination shouldn't | |
1068 | * occur here. It's characteristic of these devices. | |
1069 | */ | |
1070 | } else if (sense_valid && | |
1071 | sshdr.sense_key == UNIT_ATTENTION && | |
1072 | sshdr.asc == 0x28) { | |
1073 | if (!spintime) { | |
1074 | spintime_expire = jiffies + 5 * HZ; | |
1075 | spintime = 1; | |
1076 | } | |
1077 | /* Wait 1 second for next try */ | |
1078 | msleep(1000); | |
1da177e4 LT |
1079 | } else { |
1080 | /* we don't understand the sense code, so it's | |
1081 | * probably pointless to loop */ | |
1082 | if(!spintime) { | |
e73aec82 MP |
1083 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1084 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1085 | } |
1086 | break; | |
1087 | } | |
1088 | ||
4451e472 | 1089 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1090 | |
1091 | if (spintime) { | |
1092 | if (scsi_status_is_good(the_result)) | |
1093 | printk("ready\n"); | |
1094 | else | |
1095 | printk("not responding...\n"); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * read disk capacity | |
1101 | */ | |
1102 | static void | |
e73aec82 | 1103 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1104 | { |
1da177e4 | 1105 | unsigned char cmd[16]; |
1da177e4 LT |
1106 | int the_result, retries; |
1107 | int sector_size = 0; | |
1108 | int longrc = 0; | |
1109 | struct scsi_sense_hdr sshdr; | |
1110 | int sense_valid = 0; | |
ea73a9f2 | 1111 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1112 | |
1113 | repeat: | |
1114 | retries = 3; | |
1115 | do { | |
1116 | if (longrc) { | |
1117 | memset((void *) cmd, 0, 16); | |
1118 | cmd[0] = SERVICE_ACTION_IN; | |
1119 | cmd[1] = SAI_READ_CAPACITY_16; | |
1120 | cmd[13] = 12; | |
1121 | memset((void *) buffer, 0, 12); | |
1122 | } else { | |
1123 | cmd[0] = READ_CAPACITY; | |
1124 | memset((void *) &cmd[1], 0, 9); | |
1125 | memset((void *) buffer, 0, 8); | |
1126 | } | |
1127 | ||
ea73a9f2 JB |
1128 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
1129 | buffer, longrc ? 12 : 8, &sshdr, | |
1130 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1da177e4 | 1131 | |
ea73a9f2 | 1132 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1133 | return; |
1134 | ||
1da177e4 | 1135 | if (the_result) |
ea73a9f2 | 1136 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1137 | retries--; |
1138 | ||
1139 | } while (the_result && retries); | |
1140 | ||
1141 | if (the_result && !longrc) { | |
e73aec82 MP |
1142 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
1143 | sd_print_result(sdkp, the_result); | |
1da177e4 | 1144 | if (driver_byte(the_result) & DRIVER_SENSE) |
e73aec82 | 1145 | sd_print_sense_hdr(sdkp, &sshdr); |
1da177e4 | 1146 | else |
e73aec82 | 1147 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); |
1da177e4 LT |
1148 | |
1149 | /* Set dirty bit for removable devices if not ready - | |
1150 | * sometimes drives will not report this properly. */ | |
1151 | if (sdp->removable && | |
1152 | sense_valid && sshdr.sense_key == NOT_READY) | |
1153 | sdp->changed = 1; | |
1154 | ||
1155 | /* Either no media are present but the drive didn't tell us, | |
1156 | or they are present but the read capacity command fails */ | |
1157 | /* sdkp->media_present = 0; -- not always correct */ | |
69bdd88c | 1158 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
1da177e4 LT |
1159 | |
1160 | return; | |
1161 | } else if (the_result && longrc) { | |
1162 | /* READ CAPACITY(16) has been failed */ | |
e73aec82 MP |
1163 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
1164 | sd_print_result(sdkp, the_result); | |
1165 | sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); | |
1166 | ||
1da177e4 LT |
1167 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
1168 | goto got_data; | |
1169 | } | |
1170 | ||
1171 | if (!longrc) { | |
1172 | sector_size = (buffer[4] << 24) | | |
1173 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1174 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1175 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1176 | if(sizeof(sdkp->capacity) > 4) { | |
e73aec82 MP |
1177 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " |
1178 | "Trying to use READ CAPACITY(16).\n"); | |
1da177e4 LT |
1179 | longrc = 1; |
1180 | goto repeat; | |
1181 | } | |
e73aec82 MP |
1182 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " |
1183 | "a kernel compiled with support for large " | |
1184 | "block devices.\n"); | |
1da177e4 LT |
1185 | sdkp->capacity = 0; |
1186 | goto got_data; | |
1187 | } | |
1188 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1189 | (buffer[1] << 16) | | |
1190 | (buffer[2] << 8) | | |
1191 | buffer[3]); | |
1192 | } else { | |
1193 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1194 | ((u64)buffer[1] << 48) | | |
1195 | ((u64)buffer[2] << 40) | | |
1196 | ((u64)buffer[3] << 32) | | |
1197 | ((sector_t)buffer[4] << 24) | | |
1198 | ((sector_t)buffer[5] << 16) | | |
1199 | ((sector_t)buffer[6] << 8) | | |
1200 | (sector_t)buffer[7]); | |
1201 | ||
1202 | sector_size = (buffer[8] << 24) | | |
1203 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
1204 | } | |
1205 | ||
1206 | /* Some devices return the total number of sectors, not the | |
1207 | * highest sector number. Make the necessary adjustment. */ | |
61bf54b7 | 1208 | if (sdp->fix_capacity) { |
1da177e4 LT |
1209 | --sdkp->capacity; |
1210 | ||
61bf54b7 ON |
1211 | /* Some devices have version which report the correct sizes |
1212 | * and others which do not. We guess size according to a heuristic | |
1213 | * and err on the side of lowering the capacity. */ | |
1214 | } else { | |
1215 | if (sdp->guess_capacity) | |
1216 | if (sdkp->capacity & 0x01) /* odd sizes are odd */ | |
1217 | --sdkp->capacity; | |
1218 | } | |
1219 | ||
1da177e4 LT |
1220 | got_data: |
1221 | if (sector_size == 0) { | |
1222 | sector_size = 512; | |
e73aec82 MP |
1223 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1224 | "assuming 512.\n"); | |
1da177e4 LT |
1225 | } |
1226 | ||
1227 | if (sector_size != 512 && | |
1228 | sector_size != 1024 && | |
1229 | sector_size != 2048 && | |
1230 | sector_size != 4096 && | |
1231 | sector_size != 256) { | |
e73aec82 MP |
1232 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1233 | sector_size); | |
1da177e4 LT |
1234 | /* |
1235 | * The user might want to re-format the drive with | |
1236 | * a supported sectorsize. Once this happens, it | |
1237 | * would be relatively trivial to set the thing up. | |
1238 | * For this reason, we leave the thing in the table. | |
1239 | */ | |
1240 | sdkp->capacity = 0; | |
1241 | /* | |
1242 | * set a bogus sector size so the normal read/write | |
1243 | * logic in the block layer will eventually refuse any | |
1244 | * request on this device without tripping over power | |
1245 | * of two sector size assumptions | |
1246 | */ | |
1247 | sector_size = 512; | |
1248 | } | |
1249 | { | |
1250 | /* | |
1251 | * The msdos fs needs to know the hardware sector size | |
1252 | * So I have created this table. See ll_rw_blk.c | |
1253 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1254 | */ | |
1255 | int hard_sector = sector_size; | |
7a691bd3 | 1256 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
1da177e4 | 1257 | request_queue_t *queue = sdp->request_queue; |
7a691bd3 | 1258 | sector_t mb = sz; |
1da177e4 LT |
1259 | |
1260 | blk_queue_hardsect_size(queue, hard_sector); | |
1261 | /* avoid 64-bit division on 32-bit platforms */ | |
7a691bd3 | 1262 | sector_div(sz, 625); |
1da177e4 LT |
1263 | mb -= sz - 974; |
1264 | sector_div(mb, 1950); | |
1265 | ||
e73aec82 MP |
1266 | sd_printk(KERN_NOTICE, sdkp, |
1267 | "%llu %d-byte hardware sectors (%llu MB)\n", | |
1268 | (unsigned long long)sdkp->capacity, | |
1269 | hard_sector, (unsigned long long)mb); | |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | /* Rescale capacity to 512-byte units */ | |
1273 | if (sector_size == 4096) | |
1274 | sdkp->capacity <<= 3; | |
1275 | else if (sector_size == 2048) | |
1276 | sdkp->capacity <<= 2; | |
1277 | else if (sector_size == 1024) | |
1278 | sdkp->capacity <<= 1; | |
1279 | else if (sector_size == 256) | |
1280 | sdkp->capacity >>= 1; | |
1281 | ||
1282 | sdkp->device->sector_size = sector_size; | |
1283 | } | |
1284 | ||
1285 | /* called with buffer of length 512 */ | |
1286 | static inline int | |
ea73a9f2 JB |
1287 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1288 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1289 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1290 | { |
ea73a9f2 | 1291 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1292 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1293 | sshdr); |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | /* | |
1297 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1298 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1299 | */ |
1300 | static void | |
e73aec82 | 1301 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1302 | { |
1da177e4 | 1303 | int res; |
ea73a9f2 | 1304 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1305 | struct scsi_mode_data data; |
1306 | ||
1307 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1308 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1309 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1310 | return; |
1311 | } | |
1312 | ||
ea73a9f2 JB |
1313 | if (sdp->use_192_bytes_for_3f) { |
1314 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1315 | } else { |
1316 | /* | |
1317 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1318 | * We have to start carefully: some devices hang if we ask | |
1319 | * for more than is available. | |
1320 | */ | |
ea73a9f2 | 1321 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1322 | |
1323 | /* | |
1324 | * Second attempt: ask for page 0 When only page 0 is | |
1325 | * implemented, a request for page 3F may return Sense Key | |
1326 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1327 | * CDB. | |
1328 | */ | |
1329 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1330 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1331 | |
1332 | /* | |
1333 | * Third attempt: ask 255 bytes, as we did earlier. | |
1334 | */ | |
1335 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1336 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1337 | &data, NULL); | |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1341 | sd_printk(KERN_WARNING, sdkp, |
1342 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1343 | } else { |
1344 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1345 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
e73aec82 MP |
1346 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", |
1347 | sdkp->write_prot ? "on" : "off"); | |
1348 | sd_printk(KERN_DEBUG, sdkp, | |
1349 | "Mode Sense: %02x %02x %02x %02x\n", | |
1350 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1da177e4 LT |
1351 | } |
1352 | } | |
1353 | ||
1354 | /* | |
1355 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1356 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1357 | */ |
1358 | static void | |
e73aec82 | 1359 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1360 | { |
1da177e4 | 1361 | int len = 0, res; |
ea73a9f2 | 1362 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1363 | |
631e8a13 AV |
1364 | int dbd; |
1365 | int modepage; | |
1da177e4 LT |
1366 | struct scsi_mode_data data; |
1367 | struct scsi_sense_hdr sshdr; | |
1368 | ||
ea73a9f2 | 1369 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1370 | goto defaults; |
1371 | ||
ea73a9f2 | 1372 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1373 | modepage = 6; |
1374 | dbd = 8; | |
1375 | } else { | |
1376 | modepage = 8; | |
1377 | dbd = 0; | |
1378 | } | |
1379 | ||
1da177e4 | 1380 | /* cautiously ask */ |
ea73a9f2 | 1381 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1382 | |
1383 | if (!scsi_status_is_good(res)) | |
1384 | goto bad_sense; | |
1385 | ||
6d73c851 AV |
1386 | if (!data.header_length) { |
1387 | modepage = 6; | |
e73aec82 | 1388 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1389 | } |
1390 | ||
1da177e4 LT |
1391 | /* that went OK, now ask for the proper length */ |
1392 | len = data.length; | |
1393 | ||
1394 | /* | |
1395 | * We're only interested in the first three bytes, actually. | |
1396 | * But the data cache page is defined for the first 20. | |
1397 | */ | |
1398 | if (len < 3) | |
1399 | goto bad_sense; | |
1400 | if (len > 20) | |
1401 | len = 20; | |
1402 | ||
1403 | /* Take headers and block descriptors into account */ | |
1404 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1405 | if (len > SD_BUF_SIZE) |
1406 | goto bad_sense; | |
1da177e4 LT |
1407 | |
1408 | /* Get the data */ | |
ea73a9f2 | 1409 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1410 | |
1411 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1412 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1413 | |
48970800 | 1414 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1415 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1416 | goto defaults; |
1417 | } | |
1418 | ||
631e8a13 | 1419 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1420 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1421 | goto defaults; |
1422 | } | |
1423 | ||
1424 | if (modepage == 8) { | |
1425 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1426 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1427 | } else { | |
1428 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1429 | sdkp->RCD = 0; | |
1430 | } | |
1da177e4 | 1431 | |
007365ad TH |
1432 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1433 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1434 | sd_printk(KERN_NOTICE, sdkp, |
1435 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1436 | sdkp->DPOFUA = 0; |
1437 | } | |
1438 | ||
e73aec82 MP |
1439 | sd_printk(KERN_NOTICE, sdkp, |
1440 | "Write cache: %s, read cache: %s, %s\n", | |
fd44bab5 LT |
1441 | sdkp->WCE ? "enabled" : "disabled", |
1442 | sdkp->RCD ? "disabled" : "enabled", | |
1443 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1444 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1445 | |
1446 | return; | |
1447 | } | |
1448 | ||
1449 | bad_sense: | |
ea73a9f2 | 1450 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1451 | sshdr.sense_key == ILLEGAL_REQUEST && |
1452 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1453 | /* Invalid field in CDB */ |
1454 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1455 | else |
e73aec82 | 1456 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1457 | |
1458 | defaults: | |
e73aec82 | 1459 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1460 | sdkp->WCE = 0; |
1461 | sdkp->RCD = 0; | |
48970800 | 1462 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1463 | } |
1464 | ||
1465 | /** | |
1466 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1467 | * performs disk spin up, read_capacity, etc. | |
1468 | * @disk: struct gendisk we care about | |
1469 | **/ | |
1470 | static int sd_revalidate_disk(struct gendisk *disk) | |
1471 | { | |
1472 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1473 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1474 | unsigned char *buffer; |
461d4e90 | 1475 | unsigned ordered; |
1da177e4 | 1476 | |
fa0d34be MP |
1477 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
1478 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
1479 | |
1480 | /* | |
1481 | * If the device is offline, don't try and read capacity or any | |
1482 | * of the other niceties. | |
1483 | */ | |
1484 | if (!scsi_device_online(sdp)) | |
1485 | goto out; | |
1486 | ||
48970800 | 1487 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA); |
1da177e4 | 1488 | if (!buffer) { |
e73aec82 MP |
1489 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
1490 | "allocation failure.\n"); | |
ea73a9f2 | 1491 | goto out; |
1da177e4 LT |
1492 | } |
1493 | ||
1494 | /* defaults, until the device tells us otherwise */ | |
1495 | sdp->sector_size = 512; | |
1496 | sdkp->capacity = 0; | |
1497 | sdkp->media_present = 1; | |
1498 | sdkp->write_prot = 0; | |
1499 | sdkp->WCE = 0; | |
1500 | sdkp->RCD = 0; | |
1501 | ||
e73aec82 | 1502 | sd_spinup_disk(sdkp); |
1da177e4 LT |
1503 | |
1504 | /* | |
1505 | * Without media there is no reason to ask; moreover, some devices | |
1506 | * react badly if we do. | |
1507 | */ | |
1508 | if (sdkp->media_present) { | |
e73aec82 MP |
1509 | sd_read_capacity(sdkp, buffer); |
1510 | sd_read_write_protect_flag(sdkp, buffer); | |
1511 | sd_read_cache_type(sdkp, buffer); | |
1da177e4 | 1512 | } |
461d4e90 TH |
1513 | |
1514 | /* | |
1515 | * We now have all cache related info, determine how we deal | |
1516 | * with ordered requests. Note that as the current SCSI | |
1517 | * dispatch function can alter request order, we cannot use | |
1518 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1519 | */ | |
1520 | if (sdkp->WCE) | |
007365ad TH |
1521 | ordered = sdkp->DPOFUA |
1522 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1523 | else |
1524 | ordered = QUEUE_ORDERED_DRAIN; | |
1525 | ||
1526 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1527 | ||
1da177e4 LT |
1528 | set_capacity(disk, sdkp->capacity); |
1529 | kfree(buffer); | |
1530 | ||
1da177e4 LT |
1531 | out: |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /** | |
1536 | * sd_probe - called during driver initialization and whenever a | |
1537 | * new scsi device is attached to the system. It is called once | |
1538 | * for each scsi device (not just disks) present. | |
1539 | * @dev: pointer to device object | |
1540 | * | |
1541 | * Returns 0 if successful (or not interested in this scsi device | |
1542 | * (e.g. scanner)); 1 when there is an error. | |
1543 | * | |
1544 | * Note: this function is invoked from the scsi mid-level. | |
1545 | * This function sets up the mapping between a given | |
1546 | * <host,channel,id,lun> (found in sdp) and new device name | |
1547 | * (e.g. /dev/sda). More precisely it is the block device major | |
1548 | * and minor number that is chosen here. | |
1549 | * | |
1550 | * Assume sd_attach is not re-entrant (for time being) | |
1551 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1552 | **/ | |
1553 | static int sd_probe(struct device *dev) | |
1554 | { | |
1555 | struct scsi_device *sdp = to_scsi_device(dev); | |
1556 | struct scsi_disk *sdkp; | |
1557 | struct gendisk *gd; | |
1558 | u32 index; | |
1559 | int error; | |
1560 | ||
1561 | error = -ENODEV; | |
631e8a13 | 1562 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1563 | goto out; |
1564 | ||
9ccfc756 JB |
1565 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1566 | "sd_attach\n")); | |
1da177e4 LT |
1567 | |
1568 | error = -ENOMEM; | |
24669f75 | 1569 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1570 | if (!sdkp) |
1571 | goto out; | |
1572 | ||
1da177e4 LT |
1573 | gd = alloc_disk(16); |
1574 | if (!gd) | |
1575 | goto out_free; | |
1576 | ||
1577 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) | |
1578 | goto out_put; | |
1579 | ||
1580 | spin_lock(&sd_index_lock); | |
1581 | error = idr_get_new(&sd_index_idr, NULL, &index); | |
1582 | spin_unlock(&sd_index_lock); | |
1583 | ||
1584 | if (index >= SD_MAX_DISKS) | |
1585 | error = -EBUSY; | |
1586 | if (error) | |
1587 | goto out_put; | |
1588 | ||
1589 | sdkp->device = sdp; | |
1590 | sdkp->driver = &sd_template; | |
1591 | sdkp->disk = gd; | |
1592 | sdkp->index = index; | |
1593 | sdkp->openers = 0; | |
1594 | ||
1595 | if (!sdp->timeout) { | |
631e8a13 | 1596 | if (sdp->type != TYPE_MOD) |
1da177e4 LT |
1597 | sdp->timeout = SD_TIMEOUT; |
1598 | else | |
1599 | sdp->timeout = SD_MOD_TIMEOUT; | |
1600 | } | |
1601 | ||
017f2e37 NST |
1602 | class_device_initialize(&sdkp->cdev); |
1603 | sdkp->cdev.dev = &sdp->sdev_gendev; | |
1604 | sdkp->cdev.class = &sd_disk_class; | |
1605 | strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); | |
1606 | ||
1607 | if (class_device_add(&sdkp->cdev)) | |
1608 | goto out_put; | |
1609 | ||
1610 | get_device(&sdp->sdev_gendev); | |
1611 | ||
1da177e4 LT |
1612 | gd->major = sd_major((index & 0xf0) >> 4); |
1613 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1614 | gd->minors = 16; | |
1615 | gd->fops = &sd_fops; | |
1616 | ||
1617 | if (index < 26) { | |
1618 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1619 | } else if (index < (26 + 1) * 26) { | |
1620 | sprintf(gd->disk_name, "sd%c%c", | |
1621 | 'a' + index / 26 - 1,'a' + index % 26); | |
1622 | } else { | |
1623 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1624 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1625 | const unsigned int m3 = index % 26; | |
1626 | sprintf(gd->disk_name, "sd%c%c%c", | |
1627 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1628 | } | |
1629 | ||
1da177e4 | 1630 | gd->private_data = &sdkp->driver; |
461d4e90 | 1631 | gd->queue = sdkp->device->request_queue; |
1da177e4 LT |
1632 | |
1633 | sd_revalidate_disk(gd); | |
1634 | ||
1635 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1636 | gd->flags = GENHD_FL_DRIVERFS; | |
1637 | if (sdp->removable) | |
1638 | gd->flags |= GENHD_FL_REMOVABLE; | |
1da177e4 LT |
1639 | |
1640 | dev_set_drvdata(dev, sdkp); | |
1641 | add_disk(gd); | |
1642 | ||
e73aec82 MP |
1643 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
1644 | sdp->removable ? "removable " : ""); | |
1da177e4 LT |
1645 | |
1646 | return 0; | |
1647 | ||
6bdaa1f1 | 1648 | out_put: |
1da177e4 | 1649 | put_disk(gd); |
6bdaa1f1 | 1650 | out_free: |
1da177e4 | 1651 | kfree(sdkp); |
6bdaa1f1 | 1652 | out: |
1da177e4 LT |
1653 | return error; |
1654 | } | |
1655 | ||
1656 | /** | |
1657 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1658 | * sd_probe) is detached from the system. It is called (potentially | |
1659 | * multiple times) during sd module unload. | |
1660 | * @sdp: pointer to mid level scsi device object | |
1661 | * | |
1662 | * Note: this function is invoked from the scsi mid-level. | |
1663 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1664 | * that could be re-used by a subsequent sd_probe(). | |
1665 | * This function is not called when the built-in sd driver is "exit-ed". | |
1666 | **/ | |
1667 | static int sd_remove(struct device *dev) | |
1668 | { | |
1669 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1670 | ||
6bdaa1f1 | 1671 | class_device_del(&sdkp->cdev); |
1da177e4 LT |
1672 | del_gendisk(sdkp->disk); |
1673 | sd_shutdown(dev); | |
39b7f1e2 | 1674 | |
0b950672 | 1675 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1676 | dev_set_drvdata(dev, NULL); |
6bdaa1f1 | 1677 | class_device_put(&sdkp->cdev); |
0b950672 | 1678 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1679 | |
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | /** | |
1684 | * scsi_disk_release - Called to free the scsi_disk structure | |
6bdaa1f1 | 1685 | * @cdev: pointer to embedded class device |
1da177e4 | 1686 | * |
0b950672 | 1687 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1688 | * called on last put, you should always use the scsi_disk_get() |
1689 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
6bdaa1f1 | 1690 | * and never do a direct class_device_put(). |
1da177e4 | 1691 | **/ |
6bdaa1f1 | 1692 | static void scsi_disk_release(struct class_device *cdev) |
1da177e4 | 1693 | { |
6bdaa1f1 | 1694 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
1da177e4 LT |
1695 | struct gendisk *disk = sdkp->disk; |
1696 | ||
1697 | spin_lock(&sd_index_lock); | |
1698 | idr_remove(&sd_index_idr, sdkp->index); | |
1699 | spin_unlock(&sd_index_lock); | |
1700 | ||
1701 | disk->private_data = NULL; | |
1da177e4 | 1702 | put_disk(disk); |
39b7f1e2 | 1703 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
1704 | |
1705 | kfree(sdkp); | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1710 | * the normal SCSI command structure. Wait for the command to | |
1711 | * complete. | |
1712 | */ | |
1713 | static void sd_shutdown(struct device *dev) | |
1714 | { | |
39b7f1e2 | 1715 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
1716 | |
1717 | if (!sdkp) | |
1718 | return; /* this can happen */ | |
1719 | ||
39b7f1e2 | 1720 | if (sdkp->WCE) { |
e73aec82 MP |
1721 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
1722 | sd_sync_cache(sdkp); | |
39b7f1e2 AS |
1723 | } |
1724 | scsi_disk_put(sdkp); | |
1725 | } | |
1da177e4 LT |
1726 | |
1727 | /** | |
1728 | * init_sd - entry point for this driver (both when built in or when | |
1729 | * a module). | |
1730 | * | |
1731 | * Note: this function registers this driver with the scsi mid-level. | |
1732 | **/ | |
1733 | static int __init init_sd(void) | |
1734 | { | |
5e4009ba | 1735 | int majors = 0, i, err; |
1da177e4 LT |
1736 | |
1737 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
1738 | ||
1739 | for (i = 0; i < SD_MAJORS; i++) | |
1740 | if (register_blkdev(sd_major(i), "sd") == 0) | |
1741 | majors++; | |
1742 | ||
1743 | if (!majors) | |
1744 | return -ENODEV; | |
1745 | ||
5e4009ba JG |
1746 | err = class_register(&sd_disk_class); |
1747 | if (err) | |
1748 | goto err_out; | |
6bdaa1f1 | 1749 | |
5e4009ba JG |
1750 | err = scsi_register_driver(&sd_template.gendrv); |
1751 | if (err) | |
1752 | goto err_out_class; | |
1753 | ||
1754 | return 0; | |
1755 | ||
1756 | err_out_class: | |
1757 | class_unregister(&sd_disk_class); | |
1758 | err_out: | |
1759 | for (i = 0; i < SD_MAJORS; i++) | |
1760 | unregister_blkdev(sd_major(i), "sd"); | |
1761 | return err; | |
1da177e4 LT |
1762 | } |
1763 | ||
1764 | /** | |
1765 | * exit_sd - exit point for this driver (when it is a module). | |
1766 | * | |
1767 | * Note: this function unregisters this driver from the scsi mid-level. | |
1768 | **/ | |
1769 | static void __exit exit_sd(void) | |
1770 | { | |
1771 | int i; | |
1772 | ||
1773 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
1774 | ||
1775 | scsi_unregister_driver(&sd_template.gendrv); | |
5e4009ba JG |
1776 | class_unregister(&sd_disk_class); |
1777 | ||
1da177e4 LT |
1778 | for (i = 0; i < SD_MAJORS; i++) |
1779 | unregister_blkdev(sd_major(i), "sd"); | |
1780 | } | |
1781 | ||
1da177e4 LT |
1782 | module_init(init_sd); |
1783 | module_exit(exit_sd); | |
e73aec82 MP |
1784 | |
1785 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
1786 | struct scsi_sense_hdr *sshdr) | |
1787 | { | |
1788 | sd_printk(KERN_INFO, sdkp, ""); | |
1789 | scsi_show_sense_hdr(sshdr); | |
1790 | sd_printk(KERN_INFO, sdkp, ""); | |
1791 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
1792 | } | |
1793 | ||
1794 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
1795 | { | |
1796 | sd_printk(KERN_INFO, sdkp, ""); | |
1797 | scsi_show_result(result); | |
1798 | } | |
1799 |