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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 | |
35 | #include <linux/module.h> |
36 | #include <linux/fs.h> |
37 | #include <linux/kernel.h> |
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> |
48 | #include <linux/delay.h> |
49 | #include <linux/mutex.h> |
50 | #include <linux/string_helpers.h> |
51 | #include <linux/async.h> |
52 | #include <linux/slab.h> |
53 | #include <linux/pm_runtime.h> |
54 | #include <asm/uaccess.h> |
55 | #include <asm/unaligned.h> |
56 | |
57 | #include <scsi/scsi.h> |
58 | #include <scsi/scsi_cmnd.h> |
59 | #include <scsi/scsi_dbg.h> |
60 | #include <scsi/scsi_device.h> |
61 | #include <scsi/scsi_driver.h> |
62 | #include <scsi/scsi_eh.h> |
63 | #include <scsi/scsi_host.h> |
64 | #include <scsi/scsi_ioctl.h> |
65 | #include <scsi/scsicam.h> |
66 | |
67 | #include "sd.h" |
68 | #include "scsi_priv.h" |
69 | #include "scsi_logging.h" |
70 | |
71 | MODULE_AUTHOR("Eric Youngdale"); |
72 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); |
73 | MODULE_LICENSE("GPL"); |
74 | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); |
89 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); |
90 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); |
91 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
92 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); |
93 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); |
94 | |
95 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
96 | #define SD_MINORS 16 |
97 | #else |
98 | #define SD_MINORS 0 |
99 | #endif |
100 | |
101 | static void sd_config_discard(struct scsi_disk *, unsigned int); |
102 | static void sd_config_write_same(struct scsi_disk *); |
103 | static int sd_revalidate_disk(struct gendisk *); |
104 | static void sd_unlock_native_capacity(struct gendisk *disk); |
105 | static int sd_probe(struct device *); |
106 | static int sd_remove(struct device *); |
107 | static void sd_shutdown(struct device *); |
108 | static int sd_suspend(struct device *); |
109 | static int sd_resume(struct device *); |
110 | static void sd_rescan(struct device *); |
111 | static int sd_done(struct scsi_cmnd *); |
112 | static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int); |
113 | static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); |
114 | static void scsi_disk_release(struct device *cdev); |
115 | static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); |
116 | static void sd_print_result(struct scsi_disk *, int); |
117 | |
118 | static DEFINE_SPINLOCK(sd_index_lock); |
119 | static DEFINE_IDA(sd_index_ida); |
120 | |
121 | /* This semaphore is used to mediate the 0->1 reference get in the |
122 | * face of object destruction (i.e. we can't allow a get on an |
123 | * object after last put) */ |
124 | static DEFINE_MUTEX(sd_ref_mutex); |
125 | |
126 | static struct kmem_cache *sd_cdb_cache; |
127 | static mempool_t *sd_cdb_pool; |
128 | |
129 | static const char *sd_cache_types[] = { |
130 | "write through", "none", "write back", |
131 | "write back, no read (daft)" |
132 | }; |
133 | |
134 | static ssize_t |
135 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, |
136 | const char *buf, size_t count) |
137 | { |
138 | int i, ct = -1, rcd, wce, sp; |
139 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
140 | struct scsi_device *sdp = sdkp->device; |
141 | char buffer[64]; |
142 | char *buffer_data; |
143 | struct scsi_mode_data data; |
144 | struct scsi_sense_hdr sshdr; |
145 | static const char temp[] = "temporary "; |
146 | int len; |
147 | |
148 | if (sdp->type != TYPE_DISK) |
149 | /* no cache control on RBC devices; theoretically they |
150 | * can do it, but there's probably so many exceptions |
151 | * it's not worth the risk */ |
152 | return -EINVAL; |
153 | |
154 | if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { |
155 | buf += sizeof(temp) - 1; |
156 | sdkp->cache_override = 1; |
157 | } else { |
158 | sdkp->cache_override = 0; |
159 | } |
160 | |
161 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
162 | len = strlen(sd_cache_types[i]); |
163 | if (strncmp(sd_cache_types[i], buf, len) == 0 && |
164 | buf[len] == '\n') { |
165 | ct = i; |
166 | break; |
167 | } |
168 | } |
169 | if (ct < 0) |
170 | return -EINVAL; |
171 | rcd = ct & 0x01 ? 1 : 0; |
172 | wce = ct & 0x02 ? 1 : 0; |
173 | |
174 | if (sdkp->cache_override) { |
175 | sdkp->WCE = wce; |
176 | sdkp->RCD = rcd; |
177 | return count; |
178 | } |
179 | |
180 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, |
181 | SD_MAX_RETRIES, &data, NULL)) |
182 | return -EINVAL; |
183 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
184 | data.block_descriptor_length); |
185 | buffer_data = buffer + data.header_length + |
186 | data.block_descriptor_length; |
187 | buffer_data[2] &= ~0x05; |
188 | buffer_data[2] |= wce << 2 | rcd; |
189 | sp = buffer_data[0] & 0x80 ? 1 : 0; |
190 | |
191 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, |
192 | SD_MAX_RETRIES, &data, &sshdr)) { |
193 | if (scsi_sense_valid(&sshdr)) |
194 | sd_print_sense_hdr(sdkp, &sshdr); |
195 | return -EINVAL; |
196 | } |
197 | revalidate_disk(sdkp->disk); |
198 | return count; |
199 | } |
200 | |
201 | static ssize_t |
202 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, |
203 | const char *buf, size_t count) |
204 | { |
205 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
206 | struct scsi_device *sdp = sdkp->device; |
207 | |
208 | if (!capable(CAP_SYS_ADMIN)) |
209 | return -EACCES; |
210 | |
211 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); |
212 | |
213 | return count; |
214 | } |
215 | |
216 | static ssize_t |
217 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, |
218 | const char *buf, size_t count) |
219 | { |
220 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
221 | struct scsi_device *sdp = sdkp->device; |
222 | |
223 | if (!capable(CAP_SYS_ADMIN)) |
224 | return -EACCES; |
225 | |
226 | if (sdp->type != TYPE_DISK) |
227 | return -EINVAL; |
228 | |
229 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); |
230 | |
231 | return count; |
232 | } |
233 | |
234 | static ssize_t |
235 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, |
236 | char *buf) |
237 | { |
238 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
239 | int ct = sdkp->RCD + 2*sdkp->WCE; |
240 | |
241 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); |
242 | } |
243 | |
244 | static ssize_t |
245 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) |
246 | { |
247 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
248 | |
249 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); |
250 | } |
251 | |
252 | static ssize_t |
253 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, |
254 | char *buf) |
255 | { |
256 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
257 | struct scsi_device *sdp = sdkp->device; |
258 | |
259 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); |
260 | } |
261 | |
262 | static ssize_t |
263 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, |
264 | char *buf) |
265 | { |
266 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
267 | |
268 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); |
269 | } |
270 | |
271 | static ssize_t |
272 | sd_show_protection_type(struct device *dev, struct device_attribute *attr, |
273 | char *buf) |
274 | { |
275 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
276 | |
277 | return snprintf(buf, 20, "%u\n", sdkp->protection_type); |
278 | } |
279 | |
280 | static ssize_t |
281 | sd_store_protection_type(struct device *dev, struct device_attribute *attr, |
282 | const char *buf, size_t count) |
283 | { |
284 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
285 | unsigned int val; |
286 | int err; |
287 | |
288 | if (!capable(CAP_SYS_ADMIN)) |
289 | return -EACCES; |
290 | |
291 | err = kstrtouint(buf, 10, &val); |
292 | |
293 | if (err) |
294 | return err; |
295 | |
296 | if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) |
297 | sdkp->protection_type = val; |
298 | |
299 | return count; |
300 | } |
301 | |
302 | static ssize_t |
303 | sd_show_protection_mode(struct device *dev, struct device_attribute *attr, |
304 | char *buf) |
305 | { |
306 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
307 | struct scsi_device *sdp = sdkp->device; |
308 | unsigned int dif, dix; |
309 | |
310 | dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
311 | dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); |
312 | |
313 | if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { |
314 | dif = 0; |
315 | dix = 1; |
316 | } |
317 | |
318 | if (!dif && !dix) |
319 | return snprintf(buf, 20, "none\n"); |
320 | |
321 | return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); |
322 | } |
323 | |
324 | static ssize_t |
325 | sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, |
326 | char *buf) |
327 | { |
328 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
329 | |
330 | return snprintf(buf, 20, "%u\n", sdkp->ATO); |
331 | } |
332 | |
333 | static ssize_t |
334 | sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, |
335 | char *buf) |
336 | { |
337 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
338 | |
339 | return snprintf(buf, 20, "%u\n", sdkp->lbpme); |
340 | } |
341 | |
342 | static const char *lbp_mode[] = { |
343 | [SD_LBP_FULL] = "full", |
344 | [SD_LBP_UNMAP] = "unmap", |
345 | [SD_LBP_WS16] = "writesame_16", |
346 | [SD_LBP_WS10] = "writesame_10", |
347 | [SD_LBP_ZERO] = "writesame_zero", |
348 | [SD_LBP_DISABLE] = "disabled", |
349 | }; |
350 | |
351 | static ssize_t |
352 | sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr, |
353 | char *buf) |
354 | { |
355 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
356 | |
357 | return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); |
358 | } |
359 | |
360 | static ssize_t |
361 | sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr, |
362 | const char *buf, size_t count) |
363 | { |
364 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
365 | struct scsi_device *sdp = sdkp->device; |
366 | |
367 | if (!capable(CAP_SYS_ADMIN)) |
368 | return -EACCES; |
369 | |
370 | if (sdp->type != TYPE_DISK) |
371 | return -EINVAL; |
372 | |
373 | if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) |
374 | sd_config_discard(sdkp, SD_LBP_UNMAP); |
375 | else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) |
376 | sd_config_discard(sdkp, SD_LBP_WS16); |
377 | else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) |
378 | sd_config_discard(sdkp, SD_LBP_WS10); |
379 | else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) |
380 | sd_config_discard(sdkp, SD_LBP_ZERO); |
381 | else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) |
382 | sd_config_discard(sdkp, SD_LBP_DISABLE); |
383 | else |
384 | return -EINVAL; |
385 | |
386 | return count; |
387 | } |
388 | |
389 | static ssize_t |
390 | sd_show_max_medium_access_timeouts(struct device *dev, |
391 | struct device_attribute *attr, char *buf) |
392 | { |
393 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
394 | |
395 | return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); |
396 | } |
397 | |
398 | static ssize_t |
399 | sd_store_max_medium_access_timeouts(struct device *dev, |
400 | struct device_attribute *attr, |
401 | const char *buf, size_t count) |
402 | { |
403 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
404 | int err; |
405 | |
406 | if (!capable(CAP_SYS_ADMIN)) |
407 | return -EACCES; |
408 | |
409 | err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); |
410 | |
411 | return err ? err : count; |
412 | } |
413 | |
414 | static ssize_t |
415 | sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr, |
416 | char *buf) |
417 | { |
418 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
419 | |
420 | return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); |
421 | } |
422 | |
423 | static ssize_t |
424 | sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr, |
425 | const char *buf, size_t count) |
426 | { |
427 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
428 | struct scsi_device *sdp = sdkp->device; |
429 | unsigned long max; |
430 | int err; |
431 | |
432 | if (!capable(CAP_SYS_ADMIN)) |
433 | return -EACCES; |
434 | |
435 | if (sdp->type != TYPE_DISK) |
436 | return -EINVAL; |
437 | |
438 | err = kstrtoul(buf, 10, &max); |
439 | |
440 | if (err) |
441 | return err; |
442 | |
443 | if (max == 0) |
444 | sdp->no_write_same = 1; |
445 | else if (max <= SD_MAX_WS16_BLOCKS) { |
446 | sdp->no_write_same = 0; |
447 | sdkp->max_ws_blocks = max; |
448 | } |
449 | |
450 | sd_config_write_same(sdkp); |
451 | |
452 | return count; |
453 | } |
454 | |
455 | static struct device_attribute sd_disk_attrs[] = { |
456 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
457 | sd_store_cache_type), |
458 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), |
459 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
460 | sd_store_allow_restart), |
461 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
462 | sd_store_manage_start_stop), |
463 | __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type, |
464 | sd_store_protection_type), |
465 | __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), |
466 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), |
467 | __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), |
468 | __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode, |
469 | sd_store_provisioning_mode), |
470 | __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR, |
471 | sd_show_write_same_blocks, sd_store_write_same_blocks), |
472 | __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR, |
473 | sd_show_max_medium_access_timeouts, |
474 | sd_store_max_medium_access_timeouts), |
475 | __ATTR_NULL, |
476 | }; |
477 | |
478 | static struct class sd_disk_class = { |
479 | .name = "scsi_disk", |
480 | .owner = THIS_MODULE, |
481 | .dev_release = scsi_disk_release, |
482 | .dev_attrs = sd_disk_attrs, |
483 | }; |
484 | |
485 | static const struct dev_pm_ops sd_pm_ops = { |
486 | .suspend = sd_suspend, |
487 | .resume = sd_resume, |
488 | .poweroff = sd_suspend, |
489 | .restore = sd_resume, |
490 | .runtime_suspend = sd_suspend, |
491 | .runtime_resume = sd_resume, |
492 | }; |
493 | |
494 | static struct scsi_driver sd_template = { |
495 | .owner = THIS_MODULE, |
496 | .gendrv = { |
497 | .name = "sd", |
498 | .probe = sd_probe, |
499 | .remove = sd_remove, |
500 | .shutdown = sd_shutdown, |
501 | .pm = &sd_pm_ops, |
502 | }, |
503 | .rescan = sd_rescan, |
504 | .done = sd_done, |
505 | .eh_action = sd_eh_action, |
506 | }; |
507 | |
508 | /* |
509 | * Dummy kobj_map->probe function. |
510 | * The default ->probe function will call modprobe, which is |
511 | * pointless as this module is already loaded. |
512 | */ |
513 | static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) |
514 | { |
515 | return NULL; |
516 | } |
517 | |
518 | /* |
519 | * Device no to disk mapping: |
520 | * |
521 | * major disc2 disc p1 |
522 | * |............|.............|....|....| <- dev_t |
523 | * 31 20 19 8 7 4 3 0 |
524 | * |
525 | * Inside a major, we have 16k disks, however mapped non- |
526 | * contiguously. The first 16 disks are for major0, the next |
527 | * ones with major1, ... Disk 256 is for major0 again, disk 272 |
528 | * for major1, ... |
529 | * As we stay compatible with our numbering scheme, we can reuse |
530 | * the well-know SCSI majors 8, 65--71, 136--143. |
531 | */ |
532 | static int sd_major(int major_idx) |
533 | { |
534 | switch (major_idx) { |
535 | case 0: |
536 | return SCSI_DISK0_MAJOR; |
537 | case 1 ... 7: |
538 | return SCSI_DISK1_MAJOR + major_idx - 1; |
539 | case 8 ... 15: |
540 | return SCSI_DISK8_MAJOR + major_idx - 8; |
541 | default: |
542 | BUG(); |
543 | return 0; /* shut up gcc */ |
544 | } |
545 | } |
546 | |
547 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
548 | { |
549 | struct scsi_disk *sdkp = NULL; |
550 | |
551 | if (disk->private_data) { |
552 | sdkp = scsi_disk(disk); |
553 | if (scsi_device_get(sdkp->device) == 0) |
554 | get_device(&sdkp->dev); |
555 | else |
556 | sdkp = NULL; |
557 | } |
558 | return sdkp; |
559 | } |
560 | |
561 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) |
562 | { |
563 | struct scsi_disk *sdkp; |
564 | |
565 | mutex_lock(&sd_ref_mutex); |
566 | sdkp = __scsi_disk_get(disk); |
567 | mutex_unlock(&sd_ref_mutex); |
568 | return sdkp; |
569 | } |
570 | |
571 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
572 | { |
573 | struct scsi_disk *sdkp; |
574 | |
575 | mutex_lock(&sd_ref_mutex); |
576 | sdkp = dev_get_drvdata(dev); |
577 | if (sdkp) |
578 | sdkp = __scsi_disk_get(sdkp->disk); |
579 | mutex_unlock(&sd_ref_mutex); |
580 | return sdkp; |
581 | } |
582 | |
583 | static void scsi_disk_put(struct scsi_disk *sdkp) |
584 | { |
585 | struct scsi_device *sdev = sdkp->device; |
586 | |
587 | mutex_lock(&sd_ref_mutex); |
588 | put_device(&sdkp->dev); |
589 | scsi_device_put(sdev); |
590 | mutex_unlock(&sd_ref_mutex); |
591 | } |
592 | |
593 | static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) |
594 | { |
595 | unsigned int prot_op = SCSI_PROT_NORMAL; |
596 | unsigned int dix = scsi_prot_sg_count(scmd); |
597 | |
598 | if (scmd->sc_data_direction == DMA_FROM_DEVICE) { |
599 | if (dif && dix) |
600 | prot_op = SCSI_PROT_READ_PASS; |
601 | else if (dif && !dix) |
602 | prot_op = SCSI_PROT_READ_STRIP; |
603 | else if (!dif && dix) |
604 | prot_op = SCSI_PROT_READ_INSERT; |
605 | } else { |
606 | if (dif && dix) |
607 | prot_op = SCSI_PROT_WRITE_PASS; |
608 | else if (dif && !dix) |
609 | prot_op = SCSI_PROT_WRITE_INSERT; |
610 | else if (!dif && dix) |
611 | prot_op = SCSI_PROT_WRITE_STRIP; |
612 | } |
613 | |
614 | scsi_set_prot_op(scmd, prot_op); |
615 | scsi_set_prot_type(scmd, dif); |
616 | } |
617 | |
618 | static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) |
619 | { |
620 | struct request_queue *q = sdkp->disk->queue; |
621 | unsigned int logical_block_size = sdkp->device->sector_size; |
622 | unsigned int max_blocks = 0; |
623 | |
624 | q->limits.discard_zeroes_data = sdkp->lbprz; |
625 | q->limits.discard_alignment = sdkp->unmap_alignment * |
626 | logical_block_size; |
627 | q->limits.discard_granularity = |
628 | max(sdkp->physical_block_size, |
629 | sdkp->unmap_granularity * logical_block_size); |
630 | |
631 | sdkp->provisioning_mode = mode; |
632 | |
633 | switch (mode) { |
634 | |
635 | case SD_LBP_DISABLE: |
636 | q->limits.max_discard_sectors = 0; |
637 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); |
638 | return; |
639 | |
640 | case SD_LBP_UNMAP: |
641 | max_blocks = min_not_zero(sdkp->max_unmap_blocks, |
642 | (u32)SD_MAX_WS16_BLOCKS); |
643 | break; |
644 | |
645 | case SD_LBP_WS16: |
646 | max_blocks = min_not_zero(sdkp->max_ws_blocks, |
647 | (u32)SD_MAX_WS16_BLOCKS); |
648 | break; |
649 | |
650 | case SD_LBP_WS10: |
651 | max_blocks = min_not_zero(sdkp->max_ws_blocks, |
652 | (u32)SD_MAX_WS10_BLOCKS); |
653 | break; |
654 | |
655 | case SD_LBP_ZERO: |
656 | max_blocks = min_not_zero(sdkp->max_ws_blocks, |
657 | (u32)SD_MAX_WS10_BLOCKS); |
658 | q->limits.discard_zeroes_data = 1; |
659 | break; |
660 | } |
661 | |
662 | q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); |
663 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
664 | } |
665 | |
666 | /** |
667 | * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device |
668 | * @sdp: scsi device to operate one |
669 | * @rq: Request to prepare |
670 | * |
671 | * Will issue either UNMAP or WRITE SAME(16) depending on preference |
672 | * indicated by target device. |
673 | **/ |
674 | static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) |
675 | { |
676 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
677 | sector_t sector = blk_rq_pos(rq); |
678 | unsigned int nr_sectors = blk_rq_sectors(rq); |
679 | unsigned int nr_bytes = blk_rq_bytes(rq); |
680 | unsigned int len; |
681 | int ret; |
682 | char *buf; |
683 | struct page *page; |
684 | |
685 | sector >>= ilog2(sdp->sector_size) - 9; |
686 | nr_sectors >>= ilog2(sdp->sector_size) - 9; |
687 | rq->timeout = SD_TIMEOUT; |
688 | |
689 | memset(rq->cmd, 0, rq->cmd_len); |
690 | |
691 | page = alloc_page(GFP_ATOMIC | __GFP_ZERO); |
692 | if (!page) |
693 | return BLKPREP_DEFER; |
694 | |
695 | switch (sdkp->provisioning_mode) { |
696 | case SD_LBP_UNMAP: |
697 | buf = page_address(page); |
698 | |
699 | rq->cmd_len = 10; |
700 | rq->cmd[0] = UNMAP; |
701 | rq->cmd[8] = 24; |
702 | |
703 | put_unaligned_be16(6 + 16, &buf[0]); |
704 | put_unaligned_be16(16, &buf[2]); |
705 | put_unaligned_be64(sector, &buf[8]); |
706 | put_unaligned_be32(nr_sectors, &buf[16]); |
707 | |
708 | len = 24; |
709 | break; |
710 | |
711 | case SD_LBP_WS16: |
712 | rq->cmd_len = 16; |
713 | rq->cmd[0] = WRITE_SAME_16; |
714 | rq->cmd[1] = 0x8; /* UNMAP */ |
715 | put_unaligned_be64(sector, &rq->cmd[2]); |
716 | put_unaligned_be32(nr_sectors, &rq->cmd[10]); |
717 | |
718 | len = sdkp->device->sector_size; |
719 | break; |
720 | |
721 | case SD_LBP_WS10: |
722 | case SD_LBP_ZERO: |
723 | rq->cmd_len = 10; |
724 | rq->cmd[0] = WRITE_SAME; |
725 | if (sdkp->provisioning_mode == SD_LBP_WS10) |
726 | rq->cmd[1] = 0x8; /* UNMAP */ |
727 | put_unaligned_be32(sector, &rq->cmd[2]); |
728 | put_unaligned_be16(nr_sectors, &rq->cmd[7]); |
729 | |
730 | len = sdkp->device->sector_size; |
731 | break; |
732 | |
733 | default: |
734 | ret = BLKPREP_KILL; |
735 | goto out; |
736 | } |
737 | |
738 | blk_add_request_payload(rq, page, len); |
739 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
740 | rq->buffer = page_address(page); |
741 | rq->__data_len = nr_bytes; |
742 | |
743 | out: |
744 | if (ret != BLKPREP_OK) { |
745 | __free_page(page); |
746 | rq->buffer = NULL; |
747 | } |
748 | return ret; |
749 | } |
750 | |
751 | static void sd_config_write_same(struct scsi_disk *sdkp) |
752 | { |
753 | struct request_queue *q = sdkp->disk->queue; |
754 | unsigned int logical_block_size = sdkp->device->sector_size; |
755 | |
756 | if (sdkp->device->no_write_same) { |
757 | sdkp->max_ws_blocks = 0; |
758 | goto out; |
759 | } |
760 | |
761 | /* Some devices can not handle block counts above 0xffff despite |
762 | * supporting WRITE SAME(16). Consequently we default to 64k |
763 | * blocks per I/O unless the device explicitly advertises a |
764 | * bigger limit. |
765 | */ |
766 | if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) |
767 | sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, |
768 | (u32)SD_MAX_WS16_BLOCKS); |
769 | else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) |
770 | sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, |
771 | (u32)SD_MAX_WS10_BLOCKS); |
772 | else { |
773 | sdkp->device->no_write_same = 1; |
774 | sdkp->max_ws_blocks = 0; |
775 | } |
776 | |
777 | out: |
778 | blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * |
779 | (logical_block_size >> 9)); |
780 | } |
781 | |
782 | /** |
783 | * sd_setup_write_same_cmnd - write the same data to multiple blocks |
784 | * @sdp: scsi device to operate one |
785 | * @rq: Request to prepare |
786 | * |
787 | * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on |
788 | * preference indicated by target device. |
789 | **/ |
790 | static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq) |
791 | { |
792 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
793 | struct bio *bio = rq->bio; |
794 | sector_t sector = blk_rq_pos(rq); |
795 | unsigned int nr_sectors = blk_rq_sectors(rq); |
796 | unsigned int nr_bytes = blk_rq_bytes(rq); |
797 | int ret; |
798 | |
799 | if (sdkp->device->no_write_same) |
800 | return BLKPREP_KILL; |
801 | |
802 | BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size); |
803 | |
804 | sector >>= ilog2(sdp->sector_size) - 9; |
805 | nr_sectors >>= ilog2(sdp->sector_size) - 9; |
806 | |
807 | rq->__data_len = sdp->sector_size; |
808 | rq->timeout = SD_WRITE_SAME_TIMEOUT; |
809 | memset(rq->cmd, 0, rq->cmd_len); |
810 | |
811 | if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { |
812 | rq->cmd_len = 16; |
813 | rq->cmd[0] = WRITE_SAME_16; |
814 | put_unaligned_be64(sector, &rq->cmd[2]); |
815 | put_unaligned_be32(nr_sectors, &rq->cmd[10]); |
816 | } else { |
817 | rq->cmd_len = 10; |
818 | rq->cmd[0] = WRITE_SAME; |
819 | put_unaligned_be32(sector, &rq->cmd[2]); |
820 | put_unaligned_be16(nr_sectors, &rq->cmd[7]); |
821 | } |
822 | |
823 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
824 | rq->__data_len = nr_bytes; |
825 | |
826 | return ret; |
827 | } |
828 | |
829 | static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) |
830 | { |
831 | rq->timeout = SD_FLUSH_TIMEOUT; |
832 | rq->retries = SD_MAX_RETRIES; |
833 | rq->cmd[0] = SYNCHRONIZE_CACHE; |
834 | rq->cmd_len = 10; |
835 | |
836 | return scsi_setup_blk_pc_cmnd(sdp, rq); |
837 | } |
838 | |
839 | static void sd_unprep_fn(struct request_queue *q, struct request *rq) |
840 | { |
841 | struct scsi_cmnd *SCpnt = rq->special; |
842 | |
843 | if (rq->cmd_flags & REQ_DISCARD) { |
844 | free_page((unsigned long)rq->buffer); |
845 | rq->buffer = NULL; |
846 | } |
847 | if (SCpnt->cmnd != rq->cmd) { |
848 | mempool_free(SCpnt->cmnd, sd_cdb_pool); |
849 | SCpnt->cmnd = NULL; |
850 | SCpnt->cmd_len = 0; |
851 | } |
852 | } |
853 | |
854 | /** |
855 | * sd_prep_fn - build a scsi (read or write) command from |
856 | * information in the request structure. |
857 | * @SCpnt: pointer to mid-level's per scsi command structure that |
858 | * contains request and into which the scsi command is written |
859 | * |
860 | * Returns 1 if successful and 0 if error (or cannot be done now). |
861 | **/ |
862 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
863 | { |
864 | struct scsi_cmnd *SCpnt; |
865 | struct scsi_device *sdp = q->queuedata; |
866 | struct gendisk *disk = rq->rq_disk; |
867 | struct scsi_disk *sdkp; |
868 | sector_t block = blk_rq_pos(rq); |
869 | sector_t threshold; |
870 | unsigned int this_count = blk_rq_sectors(rq); |
871 | int ret, host_dif; |
872 | unsigned char protect; |
873 | |
874 | /* |
875 | * Discard request come in as REQ_TYPE_FS but we turn them into |
876 | * block PC requests to make life easier. |
877 | */ |
878 | if (rq->cmd_flags & REQ_DISCARD) { |
879 | ret = sd_setup_discard_cmnd(sdp, rq); |
880 | goto out; |
881 | } else if (rq->cmd_flags & REQ_WRITE_SAME) { |
882 | ret = sd_setup_write_same_cmnd(sdp, rq); |
883 | goto out; |
884 | } else if (rq->cmd_flags & REQ_FLUSH) { |
885 | ret = scsi_setup_flush_cmnd(sdp, rq); |
886 | goto out; |
887 | } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
888 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
889 | goto out; |
890 | } else if (rq->cmd_type != REQ_TYPE_FS) { |
891 | ret = BLKPREP_KILL; |
892 | goto out; |
893 | } |
894 | ret = scsi_setup_fs_cmnd(sdp, rq); |
895 | if (ret != BLKPREP_OK) |
896 | goto out; |
897 | SCpnt = rq->special; |
898 | sdkp = scsi_disk(disk); |
899 | |
900 | /* from here on until we're complete, any goto out |
901 | * is used for a killable error condition */ |
902 | ret = BLKPREP_KILL; |
903 | |
904 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
905 | "sd_prep_fn: block=%llu, " |
906 | "count=%d\n", |
907 | (unsigned long long)block, |
908 | this_count)); |
909 | |
910 | if (!sdp || !scsi_device_online(sdp) || |
911 | block + blk_rq_sectors(rq) > get_capacity(disk)) { |
912 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
913 | "Finishing %u sectors\n", |
914 | blk_rq_sectors(rq))); |
915 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
916 | "Retry with 0x%p\n", SCpnt)); |
917 | goto out; |
918 | } |
919 | |
920 | if (sdp->changed) { |
921 | /* |
922 | * quietly refuse to do anything to a changed disc until |
923 | * the changed bit has been reset |
924 | */ |
925 | /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ |
926 | goto out; |
927 | } |
928 | |
929 | /* |
930 | * Some SD card readers can't handle multi-sector accesses which touch |
931 | * the last one or two hardware sectors. Split accesses as needed. |
932 | */ |
933 | threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * |
934 | (sdp->sector_size / 512); |
935 | |
936 | if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { |
937 | if (block < threshold) { |
938 | /* Access up to the threshold but not beyond */ |
939 | this_count = threshold - block; |
940 | } else { |
941 | /* Access only a single hardware sector */ |
942 | this_count = sdp->sector_size / 512; |
943 | } |
944 | } |
945 | |
946 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
947 | (unsigned long long)block)); |
948 | |
949 | /* |
950 | * If we have a 1K hardware sectorsize, prevent access to single |
951 | * 512 byte sectors. In theory we could handle this - in fact |
952 | * the scsi cdrom driver must be able to handle this because |
953 | * we typically use 1K blocksizes, and cdroms typically have |
954 | * 2K hardware sectorsizes. Of course, things are simpler |
955 | * with the cdrom, since it is read-only. For performance |
956 | * reasons, the filesystems should be able to handle this |
957 | * and not force the scsi disk driver to use bounce buffers |
958 | * for this. |
959 | */ |
960 | if (sdp->sector_size == 1024) { |
961 | if ((block & 1) || (blk_rq_sectors(rq) & 1)) { |
962 | scmd_printk(KERN_ERR, SCpnt, |
963 | "Bad block number requested\n"); |
964 | goto out; |
965 | } else { |
966 | block = block >> 1; |
967 | this_count = this_count >> 1; |
968 | } |
969 | } |
970 | if (sdp->sector_size == 2048) { |
971 | if ((block & 3) || (blk_rq_sectors(rq) & 3)) { |
972 | scmd_printk(KERN_ERR, SCpnt, |
973 | "Bad block number requested\n"); |
974 | goto out; |
975 | } else { |
976 | block = block >> 2; |
977 | this_count = this_count >> 2; |
978 | } |
979 | } |
980 | if (sdp->sector_size == 4096) { |
981 | if ((block & 7) || (blk_rq_sectors(rq) & 7)) { |
982 | scmd_printk(KERN_ERR, SCpnt, |
983 | "Bad block number requested\n"); |
984 | goto out; |
985 | } else { |
986 | block = block >> 3; |
987 | this_count = this_count >> 3; |
988 | } |
989 | } |
990 | if (rq_data_dir(rq) == WRITE) { |
991 | if (!sdp->writeable) { |
992 | goto out; |
993 | } |
994 | SCpnt->cmnd[0] = WRITE_6; |
995 | SCpnt->sc_data_direction = DMA_TO_DEVICE; |
996 | |
997 | if (blk_integrity_rq(rq)) |
998 | sd_dif_prepare(rq, block, sdp->sector_size); |
999 | |
1000 | } else if (rq_data_dir(rq) == READ) { |
1001 | SCpnt->cmnd[0] = READ_6; |
1002 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; |
1003 | } else { |
1004 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
1005 | goto out; |
1006 | } |
1007 | |
1008 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
1009 | "%s %d/%u 512 byte blocks.\n", |
1010 | (rq_data_dir(rq) == WRITE) ? |
1011 | "writing" : "reading", this_count, |
1012 | blk_rq_sectors(rq))); |
1013 | |
1014 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
1015 | host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
1016 | if (host_dif) |
1017 | protect = 1 << 5; |
1018 | else |
1019 | protect = 0; |
1020 | |
1021 | if (host_dif == SD_DIF_TYPE2_PROTECTION) { |
1022 | SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); |
1023 | |
1024 | if (unlikely(SCpnt->cmnd == NULL)) { |
1025 | ret = BLKPREP_DEFER; |
1026 | goto out; |
1027 | } |
1028 | |
1029 | SCpnt->cmd_len = SD_EXT_CDB_SIZE; |
1030 | memset(SCpnt->cmnd, 0, SCpnt->cmd_len); |
1031 | SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; |
1032 | SCpnt->cmnd[7] = 0x18; |
1033 | SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; |
1034 | SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
1035 | |
1036 | /* LBA */ |
1037 | SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
1038 | SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; |
1039 | SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; |
1040 | SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; |
1041 | SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; |
1042 | SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; |
1043 | SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; |
1044 | SCpnt->cmnd[19] = (unsigned char) block & 0xff; |
1045 | |
1046 | /* Expected Indirect LBA */ |
1047 | SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; |
1048 | SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; |
1049 | SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; |
1050 | SCpnt->cmnd[23] = (unsigned char) block & 0xff; |
1051 | |
1052 | /* Transfer length */ |
1053 | SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; |
1054 | SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; |
1055 | SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; |
1056 | SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; |
1057 | } else if (sdp->use_16_for_rw) { |
1058 | SCpnt->cmnd[0] += READ_16 - READ_6; |
1059 | SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
1060 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
1061 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; |
1062 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; |
1063 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; |
1064 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; |
1065 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; |
1066 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; |
1067 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; |
1068 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; |
1069 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; |
1070 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; |
1071 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; |
1072 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; |
1073 | } else if ((this_count > 0xff) || (block > 0x1fffff) || |
1074 | scsi_device_protection(SCpnt->device) || |
1075 | SCpnt->device->use_10_for_rw) { |
1076 | if (this_count > 0xffff) |
1077 | this_count = 0xffff; |
1078 | |
1079 | SCpnt->cmnd[0] += READ_10 - READ_6; |
1080 | SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
1081 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
1082 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; |
1083 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; |
1084 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; |
1085 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
1086 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; |
1087 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; |
1088 | } else { |
1089 | if (unlikely(rq->cmd_flags & REQ_FUA)) { |
1090 | /* |
1091 | * This happens only if this drive failed |
1092 | * 10byte rw command with ILLEGAL_REQUEST |
1093 | * during operation and thus turned off |
1094 | * use_10_for_rw. |
1095 | */ |
1096 | scmd_printk(KERN_ERR, SCpnt, |
1097 | "FUA write on READ/WRITE(6) drive\n"); |
1098 | goto out; |
1099 | } |
1100 | |
1101 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
1102 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); |
1103 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; |
1104 | SCpnt->cmnd[4] = (unsigned char) this_count; |
1105 | SCpnt->cmnd[5] = 0; |
1106 | } |
1107 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1108 | |
1109 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
1110 | if (host_dif || scsi_prot_sg_count(SCpnt)) |
1111 | sd_prot_op(SCpnt, host_dif); |
1112 | |
1113 | /* |
1114 | * We shouldn't disconnect in the middle of a sector, so with a dumb |
1115 | * host adapter, it's safe to assume that we can at least transfer |
1116 | * this many bytes between each connect / disconnect. |
1117 | */ |
1118 | SCpnt->transfersize = sdp->sector_size; |
1119 | SCpnt->underflow = this_count << 9; |
1120 | SCpnt->allowed = SD_MAX_RETRIES; |
1121 | |
1122 | /* |
1123 | * This indicates that the command is ready from our end to be |
1124 | * queued. |
1125 | */ |
1126 | ret = BLKPREP_OK; |
1127 | out: |
1128 | return scsi_prep_return(q, rq, ret); |
1129 | } |
1130 | |
1131 | /** |
1132 | * sd_open - open a scsi disk device |
1133 | * @inode: only i_rdev member may be used |
1134 | * @filp: only f_mode and f_flags may be used |
1135 | * |
1136 | * Returns 0 if successful. Returns a negated errno value in case |
1137 | * of error. |
1138 | * |
1139 | * Note: This can be called from a user context (e.g. fsck(1) ) |
1140 | * or from within the kernel (e.g. as a result of a mount(1) ). |
1141 | * In the latter case @inode and @filp carry an abridged amount |
1142 | * of information as noted above. |
1143 | * |
1144 | * Locking: called with bdev->bd_mutex held. |
1145 | **/ |
1146 | static int sd_open(struct block_device *bdev, fmode_t mode) |
1147 | { |
1148 | struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); |
1149 | struct scsi_device *sdev; |
1150 | int retval; |
1151 | |
1152 | if (!sdkp) |
1153 | return -ENXIO; |
1154 | |
1155 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1156 | |
1157 | sdev = sdkp->device; |
1158 | |
1159 | /* |
1160 | * If the device is in error recovery, wait until it is done. |
1161 | * If the device is offline, then disallow any access to it. |
1162 | */ |
1163 | retval = -ENXIO; |
1164 | if (!scsi_block_when_processing_errors(sdev)) |
1165 | goto error_out; |
1166 | |
1167 | if (sdev->removable || sdkp->write_prot) |
1168 | check_disk_change(bdev); |
1169 | |
1170 | /* |
1171 | * If the drive is empty, just let the open fail. |
1172 | */ |
1173 | retval = -ENOMEDIUM; |
1174 | if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) |
1175 | goto error_out; |
1176 | |
1177 | /* |
1178 | * If the device has the write protect tab set, have the open fail |
1179 | * if the user expects to be able to write to the thing. |
1180 | */ |
1181 | retval = -EROFS; |
1182 | if (sdkp->write_prot && (mode & FMODE_WRITE)) |
1183 | goto error_out; |
1184 | |
1185 | /* |
1186 | * It is possible that the disk changing stuff resulted in |
1187 | * the device being taken offline. If this is the case, |
1188 | * report this to the user, and don't pretend that the |
1189 | * open actually succeeded. |
1190 | */ |
1191 | retval = -ENXIO; |
1192 | if (!scsi_device_online(sdev)) |
1193 | goto error_out; |
1194 | |
1195 | if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { |
1196 | if (scsi_block_when_processing_errors(sdev)) |
1197 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); |
1198 | } |
1199 | |
1200 | return 0; |
1201 | |
1202 | error_out: |
1203 | scsi_disk_put(sdkp); |
1204 | return retval; |
1205 | } |
1206 | |
1207 | /** |
1208 | * sd_release - invoked when the (last) close(2) is called on this |
1209 | * scsi disk. |
1210 | * @inode: only i_rdev member may be used |
1211 | * @filp: only f_mode and f_flags may be used |
1212 | * |
1213 | * Returns 0. |
1214 | * |
1215 | * Note: may block (uninterruptible) if error recovery is underway |
1216 | * on this disk. |
1217 | * |
1218 | * Locking: called with bdev->bd_mutex held. |
1219 | **/ |
1220 | static void sd_release(struct gendisk *disk, fmode_t mode) |
1221 | { |
1222 | struct scsi_disk *sdkp = scsi_disk(disk); |
1223 | struct scsi_device *sdev = sdkp->device; |
1224 | |
1225 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1226 | |
1227 | if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { |
1228 | if (scsi_block_when_processing_errors(sdev)) |
1229 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); |
1230 | } |
1231 | |
1232 | /* |
1233 | * XXX and what if there are packets in flight and this close() |
1234 | * XXX is followed by a "rmmod sd_mod"? |
1235 | */ |
1236 | |
1237 | scsi_disk_put(sdkp); |
1238 | } |
1239 | |
1240 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1241 | { |
1242 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); |
1243 | struct scsi_device *sdp = sdkp->device; |
1244 | struct Scsi_Host *host = sdp->host; |
1245 | int diskinfo[4]; |
1246 | |
1247 | /* default to most commonly used values */ |
1248 | diskinfo[0] = 0x40; /* 1 << 6 */ |
1249 | diskinfo[1] = 0x20; /* 1 << 5 */ |
1250 | diskinfo[2] = sdkp->capacity >> 11; |
1251 | |
1252 | /* override with calculated, extended default, or driver values */ |
1253 | if (host->hostt->bios_param) |
1254 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); |
1255 | else |
1256 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); |
1257 | |
1258 | geo->heads = diskinfo[0]; |
1259 | geo->sectors = diskinfo[1]; |
1260 | geo->cylinders = diskinfo[2]; |
1261 | return 0; |
1262 | } |
1263 | |
1264 | /** |
1265 | * sd_ioctl - process an ioctl |
1266 | * @inode: only i_rdev/i_bdev members may be used |
1267 | * @filp: only f_mode and f_flags may be used |
1268 | * @cmd: ioctl command number |
1269 | * @arg: this is third argument given to ioctl(2) system call. |
1270 | * Often contains a pointer. |
1271 | * |
1272 | * Returns 0 if successful (some ioctls return positive numbers on |
1273 | * success as well). Returns a negated errno value in case of error. |
1274 | * |
1275 | * Note: most ioctls are forward onto the block subsystem or further |
1276 | * down in the scsi subsystem. |
1277 | **/ |
1278 | static int sd_ioctl(struct block_device *bdev, fmode_t mode, |
1279 | unsigned int cmd, unsigned long arg) |
1280 | { |
1281 | struct gendisk *disk = bdev->bd_disk; |
1282 | struct scsi_disk *sdkp = scsi_disk(disk); |
1283 | struct scsi_device *sdp = sdkp->device; |
1284 | void __user *p = (void __user *)arg; |
1285 | int error; |
1286 | |
1287 | SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " |
1288 | "cmd=0x%x\n", disk->disk_name, cmd)); |
1289 | |
1290 | error = scsi_verify_blk_ioctl(bdev, cmd); |
1291 | if (error < 0) |
1292 | return error; |
1293 | |
1294 | /* |
1295 | * If we are in the middle of error recovery, don't let anyone |
1296 | * else try and use this device. Also, if error recovery fails, it |
1297 | * may try and take the device offline, in which case all further |
1298 | * access to the device is prohibited. |
1299 | */ |
1300 | error = scsi_nonblockable_ioctl(sdp, cmd, p, |
1301 | (mode & FMODE_NDELAY) != 0); |
1302 | if (!scsi_block_when_processing_errors(sdp) || !error) |
1303 | goto out; |
1304 | |
1305 | /* |
1306 | * Send SCSI addressing ioctls directly to mid level, send other |
1307 | * ioctls to block level and then onto mid level if they can't be |
1308 | * resolved. |
1309 | */ |
1310 | switch (cmd) { |
1311 | case SCSI_IOCTL_GET_IDLUN: |
1312 | case SCSI_IOCTL_GET_BUS_NUMBER: |
1313 | error = scsi_ioctl(sdp, cmd, p); |
1314 | break; |
1315 | default: |
1316 | error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); |
1317 | if (error != -ENOTTY) |
1318 | break; |
1319 | error = scsi_ioctl(sdp, cmd, p); |
1320 | break; |
1321 | } |
1322 | out: |
1323 | return error; |
1324 | } |
1325 | |
1326 | static void set_media_not_present(struct scsi_disk *sdkp) |
1327 | { |
1328 | if (sdkp->media_present) |
1329 | sdkp->device->changed = 1; |
1330 | |
1331 | if (sdkp->device->removable) { |
1332 | sdkp->media_present = 0; |
1333 | sdkp->capacity = 0; |
1334 | } |
1335 | } |
1336 | |
1337 | static int media_not_present(struct scsi_disk *sdkp, |
1338 | struct scsi_sense_hdr *sshdr) |
1339 | { |
1340 | if (!scsi_sense_valid(sshdr)) |
1341 | return 0; |
1342 | |
1343 | /* not invoked for commands that could return deferred errors */ |
1344 | switch (sshdr->sense_key) { |
1345 | case UNIT_ATTENTION: |
1346 | case NOT_READY: |
1347 | /* medium not present */ |
1348 | if (sshdr->asc == 0x3A) { |
1349 | set_media_not_present(sdkp); |
1350 | return 1; |
1351 | } |
1352 | } |
1353 | return 0; |
1354 | } |
1355 | |
1356 | /** |
1357 | * sd_check_events - check media events |
1358 | * @disk: kernel device descriptor |
1359 | * @clearing: disk events currently being cleared |
1360 | * |
1361 | * Returns mask of DISK_EVENT_*. |
1362 | * |
1363 | * Note: this function is invoked from the block subsystem. |
1364 | **/ |
1365 | static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) |
1366 | { |
1367 | struct scsi_disk *sdkp = scsi_disk(disk); |
1368 | struct scsi_device *sdp = sdkp->device; |
1369 | struct scsi_sense_hdr *sshdr = NULL; |
1370 | int retval; |
1371 | |
1372 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); |
1373 | |
1374 | /* |
1375 | * If the device is offline, don't send any commands - just pretend as |
1376 | * if the command failed. If the device ever comes back online, we |
1377 | * can deal with it then. It is only because of unrecoverable errors |
1378 | * that we would ever take a device offline in the first place. |
1379 | */ |
1380 | if (!scsi_device_online(sdp)) { |
1381 | set_media_not_present(sdkp); |
1382 | goto out; |
1383 | } |
1384 | |
1385 | /* |
1386 | * Using TEST_UNIT_READY enables differentiation between drive with |
1387 | * no cartridge loaded - NOT READY, drive with changed cartridge - |
1388 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. |
1389 | * |
1390 | * Drives that auto spin down. eg iomega jaz 1G, will be started |
1391 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever |
1392 | * sd_revalidate() is called. |
1393 | */ |
1394 | retval = -ENODEV; |
1395 | |
1396 | if (scsi_block_when_processing_errors(sdp)) { |
1397 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); |
1398 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, |
1399 | sshdr); |
1400 | } |
1401 | |
1402 | /* failed to execute TUR, assume media not present */ |
1403 | if (host_byte(retval)) { |
1404 | set_media_not_present(sdkp); |
1405 | goto out; |
1406 | } |
1407 | |
1408 | if (media_not_present(sdkp, sshdr)) |
1409 | goto out; |
1410 | |
1411 | /* |
1412 | * For removable scsi disk we have to recognise the presence |
1413 | * of a disk in the drive. |
1414 | */ |
1415 | if (!sdkp->media_present) |
1416 | sdp->changed = 1; |
1417 | sdkp->media_present = 1; |
1418 | out: |
1419 | /* |
1420 | * sdp->changed is set under the following conditions: |
1421 | * |
1422 | * Medium present state has changed in either direction. |
1423 | * Device has indicated UNIT_ATTENTION. |
1424 | */ |
1425 | kfree(sshdr); |
1426 | retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; |
1427 | sdp->changed = 0; |
1428 | return retval; |
1429 | } |
1430 | |
1431 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1432 | { |
1433 | int retries, res; |
1434 | struct scsi_device *sdp = sdkp->device; |
1435 | struct scsi_sense_hdr sshdr; |
1436 | |
1437 | if (!scsi_device_online(sdp)) |
1438 | return -ENODEV; |
1439 | |
1440 | |
1441 | for (retries = 3; retries > 0; --retries) { |
1442 | unsigned char cmd[10] = { 0 }; |
1443 | |
1444 | cmd[0] = SYNCHRONIZE_CACHE; |
1445 | /* |
1446 | * Leave the rest of the command zero to indicate |
1447 | * flush everything. |
1448 | */ |
1449 | res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, |
1450 | &sshdr, SD_FLUSH_TIMEOUT, |
1451 | SD_MAX_RETRIES, NULL, REQ_PM); |
1452 | if (res == 0) |
1453 | break; |
1454 | } |
1455 | |
1456 | if (res) { |
1457 | sd_print_result(sdkp, res); |
1458 | if (driver_byte(res) & DRIVER_SENSE) |
1459 | sd_print_sense_hdr(sdkp, &sshdr); |
1460 | } |
1461 | |
1462 | if (res) |
1463 | return -EIO; |
1464 | return 0; |
1465 | } |
1466 | |
1467 | static void sd_rescan(struct device *dev) |
1468 | { |
1469 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1470 | |
1471 | if (sdkp) { |
1472 | revalidate_disk(sdkp->disk); |
1473 | scsi_disk_put(sdkp); |
1474 | } |
1475 | } |
1476 | |
1477 | |
1478 | #ifdef CONFIG_COMPAT |
1479 | /* |
1480 | * This gets directly called from VFS. When the ioctl |
1481 | * is not recognized we go back to the other translation paths. |
1482 | */ |
1483 | static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
1484 | unsigned int cmd, unsigned long arg) |
1485 | { |
1486 | struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; |
1487 | int ret; |
1488 | |
1489 | ret = scsi_verify_blk_ioctl(bdev, cmd); |
1490 | if (ret < 0) |
1491 | return ret; |
1492 | |
1493 | /* |
1494 | * If we are in the middle of error recovery, don't let anyone |
1495 | * else try and use this device. Also, if error recovery fails, it |
1496 | * may try and take the device offline, in which case all further |
1497 | * access to the device is prohibited. |
1498 | */ |
1499 | if (!scsi_block_when_processing_errors(sdev)) |
1500 | return -ENODEV; |
1501 | |
1502 | if (sdev->host->hostt->compat_ioctl) { |
1503 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
1504 | |
1505 | return ret; |
1506 | } |
1507 | |
1508 | /* |
1509 | * Let the static ioctl translation table take care of it. |
1510 | */ |
1511 | return -ENOIOCTLCMD; |
1512 | } |
1513 | #endif |
1514 | |
1515 | static const struct block_device_operations sd_fops = { |
1516 | .owner = THIS_MODULE, |
1517 | .open = sd_open, |
1518 | .release = sd_release, |
1519 | .ioctl = sd_ioctl, |
1520 | .getgeo = sd_getgeo, |
1521 | #ifdef CONFIG_COMPAT |
1522 | .compat_ioctl = sd_compat_ioctl, |
1523 | #endif |
1524 | .check_events = sd_check_events, |
1525 | .revalidate_disk = sd_revalidate_disk, |
1526 | .unlock_native_capacity = sd_unlock_native_capacity, |
1527 | }; |
1528 | |
1529 | /** |
1530 | * sd_eh_action - error handling callback |
1531 | * @scmd: sd-issued command that has failed |
1532 | * @eh_cmnd: The command that was sent during error handling |
1533 | * @eh_cmnd_len: Length of eh_cmnd in bytes |
1534 | * @eh_disp: The recovery disposition suggested by the midlayer |
1535 | * |
1536 | * This function is called by the SCSI midlayer upon completion of |
1537 | * an error handling command (TEST UNIT READY, START STOP UNIT, |
1538 | * etc.) The command sent to the device by the error handler is |
1539 | * stored in eh_cmnd. The result of sending the eh command is |
1540 | * passed in eh_disp. |
1541 | **/ |
1542 | static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd, |
1543 | int eh_cmnd_len, int eh_disp) |
1544 | { |
1545 | struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); |
1546 | |
1547 | if (!scsi_device_online(scmd->device) || |
1548 | !scsi_medium_access_command(scmd)) |
1549 | return eh_disp; |
1550 | |
1551 | /* |
1552 | * The device has timed out executing a medium access command. |
1553 | * However, the TEST UNIT READY command sent during error |
1554 | * handling completed successfully. Either the device is in the |
1555 | * process of recovering or has it suffered an internal failure |
1556 | * that prevents access to the storage medium. |
1557 | */ |
1558 | if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS && |
1559 | eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY) |
1560 | sdkp->medium_access_timed_out++; |
1561 | |
1562 | /* |
1563 | * If the device keeps failing read/write commands but TEST UNIT |
1564 | * READY always completes successfully we assume that medium |
1565 | * access is no longer possible and take the device offline. |
1566 | */ |
1567 | if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { |
1568 | scmd_printk(KERN_ERR, scmd, |
1569 | "Medium access timeout failure. Offlining disk!\n"); |
1570 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
1571 | |
1572 | return FAILED; |
1573 | } |
1574 | |
1575 | return eh_disp; |
1576 | } |
1577 | |
1578 | static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) |
1579 | { |
1580 | u64 start_lba = blk_rq_pos(scmd->request); |
1581 | u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); |
1582 | u64 bad_lba; |
1583 | int info_valid; |
1584 | /* |
1585 | * resid is optional but mostly filled in. When it's unused, |
1586 | * its value is zero, so we assume the whole buffer transferred |
1587 | */ |
1588 | unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); |
1589 | unsigned int good_bytes; |
1590 | |
1591 | if (scmd->request->cmd_type != REQ_TYPE_FS) |
1592 | return 0; |
1593 | |
1594 | info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, |
1595 | SCSI_SENSE_BUFFERSIZE, |
1596 | &bad_lba); |
1597 | if (!info_valid) |
1598 | return 0; |
1599 | |
1600 | if (scsi_bufflen(scmd) <= scmd->device->sector_size) |
1601 | return 0; |
1602 | |
1603 | if (scmd->device->sector_size < 512) { |
1604 | /* only legitimate sector_size here is 256 */ |
1605 | start_lba <<= 1; |
1606 | end_lba <<= 1; |
1607 | } else { |
1608 | /* be careful ... don't want any overflows */ |
1609 | u64 factor = scmd->device->sector_size / 512; |
1610 | do_div(start_lba, factor); |
1611 | do_div(end_lba, factor); |
1612 | } |
1613 | |
1614 | /* The bad lba was reported incorrectly, we have no idea where |
1615 | * the error is. |
1616 | */ |
1617 | if (bad_lba < start_lba || bad_lba >= end_lba) |
1618 | return 0; |
1619 | |
1620 | /* This computation should always be done in terms of |
1621 | * the resolution of the device's medium. |
1622 | */ |
1623 | good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; |
1624 | return min(good_bytes, transferred); |
1625 | } |
1626 | |
1627 | /** |
1628 | * sd_done - bottom half handler: called when the lower level |
1629 | * driver has completed (successfully or otherwise) a scsi command. |
1630 | * @SCpnt: mid-level's per command structure. |
1631 | * |
1632 | * Note: potentially run from within an ISR. Must not block. |
1633 | **/ |
1634 | static int sd_done(struct scsi_cmnd *SCpnt) |
1635 | { |
1636 | int result = SCpnt->result; |
1637 | unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); |
1638 | struct scsi_sense_hdr sshdr; |
1639 | struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); |
1640 | struct request *req = SCpnt->request; |
1641 | int sense_valid = 0; |
1642 | int sense_deferred = 0; |
1643 | unsigned char op = SCpnt->cmnd[0]; |
1644 | unsigned char unmap = SCpnt->cmnd[1] & 8; |
1645 | |
1646 | if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { |
1647 | if (!result) { |
1648 | good_bytes = blk_rq_bytes(req); |
1649 | scsi_set_resid(SCpnt, 0); |
1650 | } else { |
1651 | good_bytes = 0; |
1652 | scsi_set_resid(SCpnt, blk_rq_bytes(req)); |
1653 | } |
1654 | } |
1655 | |
1656 | if (result) { |
1657 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); |
1658 | if (sense_valid) |
1659 | sense_deferred = scsi_sense_is_deferred(&sshdr); |
1660 | } |
1661 | #ifdef CONFIG_SCSI_LOGGING |
1662 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1663 | if (sense_valid) { |
1664 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
1665 | "sd_done: sb[respc,sk,asc," |
1666 | "ascq]=%x,%x,%x,%x\n", |
1667 | sshdr.response_code, |
1668 | sshdr.sense_key, sshdr.asc, |
1669 | sshdr.ascq)); |
1670 | } |
1671 | #endif |
1672 | if (driver_byte(result) != DRIVER_SENSE && |
1673 | (!sense_valid || sense_deferred)) |
1674 | goto out; |
1675 | |
1676 | sdkp->medium_access_timed_out = 0; |
1677 | |
1678 | switch (sshdr.sense_key) { |
1679 | case HARDWARE_ERROR: |
1680 | case MEDIUM_ERROR: |
1681 | good_bytes = sd_completed_bytes(SCpnt); |
1682 | break; |
1683 | case RECOVERED_ERROR: |
1684 | good_bytes = scsi_bufflen(SCpnt); |
1685 | break; |
1686 | case NO_SENSE: |
1687 | /* This indicates a false check condition, so ignore it. An |
1688 | * unknown amount of data was transferred so treat it as an |
1689 | * error. |
1690 | */ |
1691 | scsi_print_sense("sd", SCpnt); |
1692 | SCpnt->result = 0; |
1693 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
1694 | break; |
1695 | case ABORTED_COMMAND: |
1696 | if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ |
1697 | good_bytes = sd_completed_bytes(SCpnt); |
1698 | break; |
1699 | case ILLEGAL_REQUEST: |
1700 | if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ |
1701 | good_bytes = sd_completed_bytes(SCpnt); |
1702 | /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ |
1703 | if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { |
1704 | switch (op) { |
1705 | case UNMAP: |
1706 | sd_config_discard(sdkp, SD_LBP_DISABLE); |
1707 | break; |
1708 | case WRITE_SAME_16: |
1709 | case WRITE_SAME: |
1710 | if (unmap) |
1711 | sd_config_discard(sdkp, SD_LBP_DISABLE); |
1712 | else { |
1713 | sdkp->device->no_write_same = 1; |
1714 | sd_config_write_same(sdkp); |
1715 | |
1716 | good_bytes = 0; |
1717 | req->__data_len = blk_rq_bytes(req); |
1718 | req->cmd_flags |= REQ_QUIET; |
1719 | } |
1720 | } |
1721 | } |
1722 | break; |
1723 | default: |
1724 | break; |
1725 | } |
1726 | out: |
1727 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1728 | sd_dif_complete(SCpnt, good_bytes); |
1729 | |
1730 | return good_bytes; |
1731 | } |
1732 | |
1733 | /* |
1734 | * spinup disk - called only in sd_revalidate_disk() |
1735 | */ |
1736 | static void |
1737 | sd_spinup_disk(struct scsi_disk *sdkp) |
1738 | { |
1739 | unsigned char cmd[10]; |
1740 | unsigned long spintime_expire = 0; |
1741 | int retries, spintime; |
1742 | unsigned int the_result; |
1743 | struct scsi_sense_hdr sshdr; |
1744 | int sense_valid = 0; |
1745 | |
1746 | spintime = 0; |
1747 | |
1748 | /* Spin up drives, as required. Only do this at boot time */ |
1749 | /* Spinup needs to be done for module loads too. */ |
1750 | do { |
1751 | retries = 0; |
1752 | |
1753 | do { |
1754 | cmd[0] = TEST_UNIT_READY; |
1755 | memset((void *) &cmd[1], 0, 9); |
1756 | |
1757 | the_result = scsi_execute_req(sdkp->device, cmd, |
1758 | DMA_NONE, NULL, 0, |
1759 | &sshdr, SD_TIMEOUT, |
1760 | SD_MAX_RETRIES, NULL); |
1761 | |
1762 | /* |
1763 | * If the drive has indicated to us that it |
1764 | * doesn't have any media in it, don't bother |
1765 | * with any more polling. |
1766 | */ |
1767 | if (media_not_present(sdkp, &sshdr)) |
1768 | return; |
1769 | |
1770 | if (the_result) |
1771 | sense_valid = scsi_sense_valid(&sshdr); |
1772 | retries++; |
1773 | } while (retries < 3 && |
1774 | (!scsi_status_is_good(the_result) || |
1775 | ((driver_byte(the_result) & DRIVER_SENSE) && |
1776 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); |
1777 | |
1778 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1779 | /* no sense, TUR either succeeded or failed |
1780 | * with a status error */ |
1781 | if(!spintime && !scsi_status_is_good(the_result)) { |
1782 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1783 | sd_print_result(sdkp, the_result); |
1784 | } |
1785 | break; |
1786 | } |
1787 | |
1788 | /* |
1789 | * The device does not want the automatic start to be issued. |
1790 | */ |
1791 | if (sdkp->device->no_start_on_add) |
1792 | break; |
1793 | |
1794 | if (sense_valid && sshdr.sense_key == NOT_READY) { |
1795 | if (sshdr.asc == 4 && sshdr.ascq == 3) |
1796 | break; /* manual intervention required */ |
1797 | if (sshdr.asc == 4 && sshdr.ascq == 0xb) |
1798 | break; /* standby */ |
1799 | if (sshdr.asc == 4 && sshdr.ascq == 0xc) |
1800 | break; /* unavailable */ |
1801 | /* |
1802 | * Issue command to spin up drive when not ready |
1803 | */ |
1804 | if (!spintime) { |
1805 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1806 | cmd[0] = START_STOP; |
1807 | cmd[1] = 1; /* Return immediately */ |
1808 | memset((void *) &cmd[2], 0, 8); |
1809 | cmd[4] = 1; /* Start spin cycle */ |
1810 | if (sdkp->device->start_stop_pwr_cond) |
1811 | cmd[4] |= 1 << 4; |
1812 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1813 | NULL, 0, &sshdr, |
1814 | SD_TIMEOUT, SD_MAX_RETRIES, |
1815 | NULL); |
1816 | spintime_expire = jiffies + 100 * HZ; |
1817 | spintime = 1; |
1818 | } |
1819 | /* Wait 1 second for next try */ |
1820 | msleep(1000); |
1821 | printk("."); |
1822 | |
1823 | /* |
1824 | * Wait for USB flash devices with slow firmware. |
1825 | * Yes, this sense key/ASC combination shouldn't |
1826 | * occur here. It's characteristic of these devices. |
1827 | */ |
1828 | } else if (sense_valid && |
1829 | sshdr.sense_key == UNIT_ATTENTION && |
1830 | sshdr.asc == 0x28) { |
1831 | if (!spintime) { |
1832 | spintime_expire = jiffies + 5 * HZ; |
1833 | spintime = 1; |
1834 | } |
1835 | /* Wait 1 second for next try */ |
1836 | msleep(1000); |
1837 | } else { |
1838 | /* we don't understand the sense code, so it's |
1839 | * probably pointless to loop */ |
1840 | if(!spintime) { |
1841 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1842 | sd_print_sense_hdr(sdkp, &sshdr); |
1843 | } |
1844 | break; |
1845 | } |
1846 | |
1847 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1848 | |
1849 | if (spintime) { |
1850 | if (scsi_status_is_good(the_result)) |
1851 | printk("ready\n"); |
1852 | else |
1853 | printk("not responding...\n"); |
1854 | } |
1855 | } |
1856 | |
1857 | |
1858 | /* |
1859 | * Determine whether disk supports Data Integrity Field. |
1860 | */ |
1861 | static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) |
1862 | { |
1863 | struct scsi_device *sdp = sdkp->device; |
1864 | u8 type; |
1865 | int ret = 0; |
1866 | |
1867 | if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) |
1868 | return ret; |
1869 | |
1870 | type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ |
1871 | |
1872 | if (type > SD_DIF_TYPE3_PROTECTION) |
1873 | ret = -ENODEV; |
1874 | else if (scsi_host_dif_capable(sdp->host, type)) |
1875 | ret = 1; |
1876 | |
1877 | if (sdkp->first_scan || type != sdkp->protection_type) |
1878 | switch (ret) { |
1879 | case -ENODEV: |
1880 | sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ |
1881 | " protection type %u. Disabling disk!\n", |
1882 | type); |
1883 | break; |
1884 | case 1: |
1885 | sd_printk(KERN_NOTICE, sdkp, |
1886 | "Enabling DIF Type %u protection\n", type); |
1887 | break; |
1888 | case 0: |
1889 | sd_printk(KERN_NOTICE, sdkp, |
1890 | "Disabling DIF Type %u protection\n", type); |
1891 | break; |
1892 | } |
1893 | |
1894 | sdkp->protection_type = type; |
1895 | |
1896 | return ret; |
1897 | } |
1898 | |
1899 | static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1900 | struct scsi_sense_hdr *sshdr, int sense_valid, |
1901 | int the_result) |
1902 | { |
1903 | sd_print_result(sdkp, the_result); |
1904 | if (driver_byte(the_result) & DRIVER_SENSE) |
1905 | sd_print_sense_hdr(sdkp, sshdr); |
1906 | else |
1907 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); |
1908 | |
1909 | /* |
1910 | * Set dirty bit for removable devices if not ready - |
1911 | * sometimes drives will not report this properly. |
1912 | */ |
1913 | if (sdp->removable && |
1914 | sense_valid && sshdr->sense_key == NOT_READY) |
1915 | set_media_not_present(sdkp); |
1916 | |
1917 | /* |
1918 | * We used to set media_present to 0 here to indicate no media |
1919 | * in the drive, but some drives fail read capacity even with |
1920 | * media present, so we can't do that. |
1921 | */ |
1922 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
1923 | } |
1924 | |
1925 | #define RC16_LEN 32 |
1926 | #if RC16_LEN > SD_BUF_SIZE |
1927 | #error RC16_LEN must not be more than SD_BUF_SIZE |
1928 | #endif |
1929 | |
1930 | #define READ_CAPACITY_RETRIES_ON_RESET 10 |
1931 | |
1932 | static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1933 | unsigned char *buffer) |
1934 | { |
1935 | unsigned char cmd[16]; |
1936 | struct scsi_sense_hdr sshdr; |
1937 | int sense_valid = 0; |
1938 | int the_result; |
1939 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
1940 | unsigned int alignment; |
1941 | unsigned long long lba; |
1942 | unsigned sector_size; |
1943 | |
1944 | if (sdp->no_read_capacity_16) |
1945 | return -EINVAL; |
1946 | |
1947 | do { |
1948 | memset(cmd, 0, 16); |
1949 | cmd[0] = SERVICE_ACTION_IN; |
1950 | cmd[1] = SAI_READ_CAPACITY_16; |
1951 | cmd[13] = RC16_LEN; |
1952 | memset(buffer, 0, RC16_LEN); |
1953 | |
1954 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
1955 | buffer, RC16_LEN, &sshdr, |
1956 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
1957 | |
1958 | if (media_not_present(sdkp, &sshdr)) |
1959 | return -ENODEV; |
1960 | |
1961 | if (the_result) { |
1962 | sense_valid = scsi_sense_valid(&sshdr); |
1963 | if (sense_valid && |
1964 | sshdr.sense_key == ILLEGAL_REQUEST && |
1965 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && |
1966 | sshdr.ascq == 0x00) |
1967 | /* Invalid Command Operation Code or |
1968 | * Invalid Field in CDB, just retry |
1969 | * silently with RC10 */ |
1970 | return -EINVAL; |
1971 | if (sense_valid && |
1972 | sshdr.sense_key == UNIT_ATTENTION && |
1973 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) |
1974 | /* Device reset might occur several times, |
1975 | * give it one more chance */ |
1976 | if (--reset_retries > 0) |
1977 | continue; |
1978 | } |
1979 | retries--; |
1980 | |
1981 | } while (the_result && retries); |
1982 | |
1983 | if (the_result) { |
1984 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
1985 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); |
1986 | return -EINVAL; |
1987 | } |
1988 | |
1989 | sector_size = get_unaligned_be32(&buffer[8]); |
1990 | lba = get_unaligned_be64(&buffer[0]); |
1991 | |
1992 | if (sd_read_protection_type(sdkp, buffer) < 0) { |
1993 | sdkp->capacity = 0; |
1994 | return -ENODEV; |
1995 | } |
1996 | |
1997 | if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { |
1998 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " |
1999 | "kernel compiled with support for large block " |
2000 | "devices.\n"); |
2001 | sdkp->capacity = 0; |
2002 | return -EOVERFLOW; |
2003 | } |
2004 | |
2005 | /* Logical blocks per physical block exponent */ |
2006 | sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; |
2007 | |
2008 | /* Lowest aligned logical block */ |
2009 | alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; |
2010 | blk_queue_alignment_offset(sdp->request_queue, alignment); |
2011 | if (alignment && sdkp->first_scan) |
2012 | sd_printk(KERN_NOTICE, sdkp, |
2013 | "physical block alignment offset: %u\n", alignment); |
2014 | |
2015 | if (buffer[14] & 0x80) { /* LBPME */ |
2016 | sdkp->lbpme = 1; |
2017 | |
2018 | if (buffer[14] & 0x40) /* LBPRZ */ |
2019 | sdkp->lbprz = 1; |
2020 | |
2021 | sd_config_discard(sdkp, SD_LBP_WS16); |
2022 | } |
2023 | |
2024 | sdkp->capacity = lba + 1; |
2025 | return sector_size; |
2026 | } |
2027 | |
2028 | static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, |
2029 | unsigned char *buffer) |
2030 | { |
2031 | unsigned char cmd[16]; |
2032 | struct scsi_sense_hdr sshdr; |
2033 | int sense_valid = 0; |
2034 | int the_result; |
2035 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
2036 | sector_t lba; |
2037 | unsigned sector_size; |
2038 | |
2039 | do { |
2040 | cmd[0] = READ_CAPACITY; |
2041 | memset(&cmd[1], 0, 9); |
2042 | memset(buffer, 0, 8); |
2043 | |
2044 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
2045 | buffer, 8, &sshdr, |
2046 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
2047 | |
2048 | if (media_not_present(sdkp, &sshdr)) |
2049 | return -ENODEV; |
2050 | |
2051 | if (the_result) { |
2052 | sense_valid = scsi_sense_valid(&sshdr); |
2053 | if (sense_valid && |
2054 | sshdr.sense_key == UNIT_ATTENTION && |
2055 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) |
2056 | /* Device reset might occur several times, |
2057 | * give it one more chance */ |
2058 | if (--reset_retries > 0) |
2059 | continue; |
2060 | } |
2061 | retries--; |
2062 | |
2063 | } while (the_result && retries); |
2064 | |
2065 | if (the_result) { |
2066 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
2067 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); |
2068 | return -EINVAL; |
2069 | } |
2070 | |
2071 | sector_size = get_unaligned_be32(&buffer[4]); |
2072 | lba = get_unaligned_be32(&buffer[0]); |
2073 | |
2074 | if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { |
2075 | /* Some buggy (usb cardreader) devices return an lba of |
2076 | 0xffffffff when the want to report a size of 0 (with |
2077 | which they really mean no media is present) */ |
2078 | sdkp->capacity = 0; |
2079 | sdkp->physical_block_size = sector_size; |
2080 | return sector_size; |
2081 | } |
2082 | |
2083 | if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { |
2084 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " |
2085 | "kernel compiled with support for large block " |
2086 | "devices.\n"); |
2087 | sdkp->capacity = 0; |
2088 | return -EOVERFLOW; |
2089 | } |
2090 | |
2091 | sdkp->capacity = lba + 1; |
2092 | sdkp->physical_block_size = sector_size; |
2093 | return sector_size; |
2094 | } |
2095 | |
2096 | static int sd_try_rc16_first(struct scsi_device *sdp) |
2097 | { |
2098 | if (sdp->host->max_cmd_len < 16) |
2099 | return 0; |
2100 | if (sdp->try_rc_10_first) |
2101 | return 0; |
2102 | if (sdp->scsi_level > SCSI_SPC_2) |
2103 | return 1; |
2104 | if (scsi_device_protection(sdp)) |
2105 | return 1; |
2106 | return 0; |
2107 | } |
2108 | |
2109 | /* |
2110 | * read disk capacity |
2111 | */ |
2112 | static void |
2113 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) |
2114 | { |
2115 | int sector_size; |
2116 | struct scsi_device *sdp = sdkp->device; |
2117 | sector_t old_capacity = sdkp->capacity; |
2118 | |
2119 | if (sd_try_rc16_first(sdp)) { |
2120 | sector_size = read_capacity_16(sdkp, sdp, buffer); |
2121 | if (sector_size == -EOVERFLOW) |
2122 | goto got_data; |
2123 | if (sector_size == -ENODEV) |
2124 | return; |
2125 | if (sector_size < 0) |
2126 | sector_size = read_capacity_10(sdkp, sdp, buffer); |
2127 | if (sector_size < 0) |
2128 | return; |
2129 | } else { |
2130 | sector_size = read_capacity_10(sdkp, sdp, buffer); |
2131 | if (sector_size == -EOVERFLOW) |
2132 | goto got_data; |
2133 | if (sector_size < 0) |
2134 | return; |
2135 | if ((sizeof(sdkp->capacity) > 4) && |
2136 | (sdkp->capacity > 0xffffffffULL)) { |
2137 | int old_sector_size = sector_size; |
2138 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " |
2139 | "Trying to use READ CAPACITY(16).\n"); |
2140 | sector_size = read_capacity_16(sdkp, sdp, buffer); |
2141 | if (sector_size < 0) { |
2142 | sd_printk(KERN_NOTICE, sdkp, |
2143 | "Using 0xffffffff as device size\n"); |
2144 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
2145 | sector_size = old_sector_size; |
2146 | goto got_data; |
2147 | } |
2148 | } |
2149 | } |
2150 | |
2151 | /* Some devices are known to return the total number of blocks, |
2152 | * not the highest block number. Some devices have versions |
2153 | * which do this and others which do not. Some devices we might |
2154 | * suspect of doing this but we don't know for certain. |
2155 | * |
2156 | * If we know the reported capacity is wrong, decrement it. If |
2157 | * we can only guess, then assume the number of blocks is even |
2158 | * (usually true but not always) and err on the side of lowering |
2159 | * the capacity. |
2160 | */ |
2161 | if (sdp->fix_capacity || |
2162 | (sdp->guess_capacity && (sdkp->capacity & 0x01))) { |
2163 | sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " |
2164 | "from its reported value: %llu\n", |
2165 | (unsigned long long) sdkp->capacity); |
2166 | --sdkp->capacity; |
2167 | } |
2168 | |
2169 | got_data: |
2170 | if (sector_size == 0) { |
2171 | sector_size = 512; |
2172 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
2173 | "assuming 512.\n"); |
2174 | } |
2175 | |
2176 | if (sector_size != 512 && |
2177 | sector_size != 1024 && |
2178 | sector_size != 2048 && |
2179 | sector_size != 4096 && |
2180 | sector_size != 256) { |
2181 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
2182 | sector_size); |
2183 | /* |
2184 | * The user might want to re-format the drive with |
2185 | * a supported sectorsize. Once this happens, it |
2186 | * would be relatively trivial to set the thing up. |
2187 | * For this reason, we leave the thing in the table. |
2188 | */ |
2189 | sdkp->capacity = 0; |
2190 | /* |
2191 | * set a bogus sector size so the normal read/write |
2192 | * logic in the block layer will eventually refuse any |
2193 | * request on this device without tripping over power |
2194 | * of two sector size assumptions |
2195 | */ |
2196 | sector_size = 512; |
2197 | } |
2198 | blk_queue_logical_block_size(sdp->request_queue, sector_size); |
2199 | |
2200 | { |
2201 | char cap_str_2[10], cap_str_10[10]; |
2202 | u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
2203 | |
2204 | string_get_size(sz, STRING_UNITS_2, cap_str_2, |
2205 | sizeof(cap_str_2)); |
2206 | string_get_size(sz, STRING_UNITS_10, cap_str_10, |
2207 | sizeof(cap_str_10)); |
2208 | |
2209 | if (sdkp->first_scan || old_capacity != sdkp->capacity) { |
2210 | sd_printk(KERN_NOTICE, sdkp, |
2211 | "%llu %d-byte logical blocks: (%s/%s)\n", |
2212 | (unsigned long long)sdkp->capacity, |
2213 | sector_size, cap_str_10, cap_str_2); |
2214 | |
2215 | if (sdkp->physical_block_size != sector_size) |
2216 | sd_printk(KERN_NOTICE, sdkp, |
2217 | "%u-byte physical blocks\n", |
2218 | sdkp->physical_block_size); |
2219 | } |
2220 | } |
2221 | |
2222 | sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff); |
2223 | |
2224 | /* Rescale capacity to 512-byte units */ |
2225 | if (sector_size == 4096) |
2226 | sdkp->capacity <<= 3; |
2227 | else if (sector_size == 2048) |
2228 | sdkp->capacity <<= 2; |
2229 | else if (sector_size == 1024) |
2230 | sdkp->capacity <<= 1; |
2231 | else if (sector_size == 256) |
2232 | sdkp->capacity >>= 1; |
2233 | |
2234 | blk_queue_physical_block_size(sdp->request_queue, |
2235 | sdkp->physical_block_size); |
2236 | sdkp->device->sector_size = sector_size; |
2237 | } |
2238 | |
2239 | /* called with buffer of length 512 */ |
2240 | static inline int |
2241 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
2242 | unsigned char *buffer, int len, struct scsi_mode_data *data, |
2243 | struct scsi_sense_hdr *sshdr) |
2244 | { |
2245 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
2246 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
2247 | sshdr); |
2248 | } |
2249 | |
2250 | /* |
2251 | * read write protect setting, if possible - called only in sd_revalidate_disk() |
2252 | * called with buffer of length SD_BUF_SIZE |
2253 | */ |
2254 | static void |
2255 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
2256 | { |
2257 | int res; |
2258 | struct scsi_device *sdp = sdkp->device; |
2259 | struct scsi_mode_data data; |
2260 | int old_wp = sdkp->write_prot; |
2261 | |
2262 | set_disk_ro(sdkp->disk, 0); |
2263 | if (sdp->skip_ms_page_3f) { |
2264 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
2265 | return; |
2266 | } |
2267 | |
2268 | if (sdp->use_192_bytes_for_3f) { |
2269 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); |
2270 | } else { |
2271 | /* |
2272 | * First attempt: ask for all pages (0x3F), but only 4 bytes. |
2273 | * We have to start carefully: some devices hang if we ask |
2274 | * for more than is available. |
2275 | */ |
2276 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
2277 | |
2278 | /* |
2279 | * Second attempt: ask for page 0 When only page 0 is |
2280 | * implemented, a request for page 3F may return Sense Key |
2281 | * 5: Illegal Request, Sense Code 24: Invalid field in |
2282 | * CDB. |
2283 | */ |
2284 | if (!scsi_status_is_good(res)) |
2285 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
2286 | |
2287 | /* |
2288 | * Third attempt: ask 255 bytes, as we did earlier. |
2289 | */ |
2290 | if (!scsi_status_is_good(res)) |
2291 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
2292 | &data, NULL); |
2293 | } |
2294 | |
2295 | if (!scsi_status_is_good(res)) { |
2296 | sd_printk(KERN_WARNING, sdkp, |
2297 | "Test WP failed, assume Write Enabled\n"); |
2298 | } else { |
2299 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); |
2300 | set_disk_ro(sdkp->disk, sdkp->write_prot); |
2301 | if (sdkp->first_scan || old_wp != sdkp->write_prot) { |
2302 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", |
2303 | sdkp->write_prot ? "on" : "off"); |
2304 | sd_printk(KERN_DEBUG, sdkp, |
2305 | "Mode Sense: %02x %02x %02x %02x\n", |
2306 | buffer[0], buffer[1], buffer[2], buffer[3]); |
2307 | } |
2308 | } |
2309 | } |
2310 | |
2311 | /* |
2312 | * sd_read_cache_type - called only from sd_revalidate_disk() |
2313 | * called with buffer of length SD_BUF_SIZE |
2314 | */ |
2315 | static void |
2316 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
2317 | { |
2318 | int len = 0, res; |
2319 | struct scsi_device *sdp = sdkp->device; |
2320 | |
2321 | int dbd; |
2322 | int modepage; |
2323 | int first_len; |
2324 | struct scsi_mode_data data; |
2325 | struct scsi_sense_hdr sshdr; |
2326 | int old_wce = sdkp->WCE; |
2327 | int old_rcd = sdkp->RCD; |
2328 | int old_dpofua = sdkp->DPOFUA; |
2329 | |
2330 | |
2331 | if (sdkp->cache_override) |
2332 | return; |
2333 | |
2334 | first_len = 4; |
2335 | if (sdp->skip_ms_page_8) { |
2336 | if (sdp->type == TYPE_RBC) |
2337 | goto defaults; |
2338 | else { |
2339 | if (sdp->skip_ms_page_3f) |
2340 | goto defaults; |
2341 | modepage = 0x3F; |
2342 | if (sdp->use_192_bytes_for_3f) |
2343 | first_len = 192; |
2344 | dbd = 0; |
2345 | } |
2346 | } else if (sdp->type == TYPE_RBC) { |
2347 | modepage = 6; |
2348 | dbd = 8; |
2349 | } else { |
2350 | modepage = 8; |
2351 | dbd = 0; |
2352 | } |
2353 | |
2354 | /* cautiously ask */ |
2355 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, |
2356 | &data, &sshdr); |
2357 | |
2358 | if (!scsi_status_is_good(res)) |
2359 | goto bad_sense; |
2360 | |
2361 | if (!data.header_length) { |
2362 | modepage = 6; |
2363 | first_len = 0; |
2364 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
2365 | } |
2366 | |
2367 | /* that went OK, now ask for the proper length */ |
2368 | len = data.length; |
2369 | |
2370 | /* |
2371 | * We're only interested in the first three bytes, actually. |
2372 | * But the data cache page is defined for the first 20. |
2373 | */ |
2374 | if (len < 3) |
2375 | goto bad_sense; |
2376 | else if (len > SD_BUF_SIZE) { |
2377 | sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " |
2378 | "data from %d to %d bytes\n", len, SD_BUF_SIZE); |
2379 | len = SD_BUF_SIZE; |
2380 | } |
2381 | if (modepage == 0x3F && sdp->use_192_bytes_for_3f) |
2382 | len = 192; |
2383 | |
2384 | /* Get the data */ |
2385 | if (len > first_len) |
2386 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, |
2387 | &data, &sshdr); |
2388 | |
2389 | if (scsi_status_is_good(res)) { |
2390 | int offset = data.header_length + data.block_descriptor_length; |
2391 | |
2392 | while (offset < len) { |
2393 | u8 page_code = buffer[offset] & 0x3F; |
2394 | u8 spf = buffer[offset] & 0x40; |
2395 | |
2396 | if (page_code == 8 || page_code == 6) { |
2397 | /* We're interested only in the first 3 bytes. |
2398 | */ |
2399 | if (len - offset <= 2) { |
2400 | sd_printk(KERN_ERR, sdkp, "Incomplete " |
2401 | "mode parameter data\n"); |
2402 | goto defaults; |
2403 | } else { |
2404 | modepage = page_code; |
2405 | goto Page_found; |
2406 | } |
2407 | } else { |
2408 | /* Go to the next page */ |
2409 | if (spf && len - offset > 3) |
2410 | offset += 4 + (buffer[offset+2] << 8) + |
2411 | buffer[offset+3]; |
2412 | else if (!spf && len - offset > 1) |
2413 | offset += 2 + buffer[offset+1]; |
2414 | else { |
2415 | sd_printk(KERN_ERR, sdkp, "Incomplete " |
2416 | "mode parameter data\n"); |
2417 | goto defaults; |
2418 | } |
2419 | } |
2420 | } |
2421 | |
2422 | if (modepage == 0x3F) { |
2423 | sd_printk(KERN_ERR, sdkp, "No Caching mode page " |
2424 | "present\n"); |
2425 | goto defaults; |
2426 | } else if ((buffer[offset] & 0x3f) != modepage) { |
2427 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
2428 | goto defaults; |
2429 | } |
2430 | Page_found: |
2431 | if (modepage == 8) { |
2432 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); |
2433 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); |
2434 | } else { |
2435 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); |
2436 | sdkp->RCD = 0; |
2437 | } |
2438 | |
2439 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
2440 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { |
2441 | sd_printk(KERN_NOTICE, sdkp, |
2442 | "Uses READ/WRITE(6), disabling FUA\n"); |
2443 | sdkp->DPOFUA = 0; |
2444 | } |
2445 | |
2446 | if (sdkp->first_scan || old_wce != sdkp->WCE || |
2447 | old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) |
2448 | sd_printk(KERN_NOTICE, sdkp, |
2449 | "Write cache: %s, read cache: %s, %s\n", |
2450 | sdkp->WCE ? "enabled" : "disabled", |
2451 | sdkp->RCD ? "disabled" : "enabled", |
2452 | sdkp->DPOFUA ? "supports DPO and FUA" |
2453 | : "doesn't support DPO or FUA"); |
2454 | |
2455 | return; |
2456 | } |
2457 | |
2458 | bad_sense: |
2459 | if (scsi_sense_valid(&sshdr) && |
2460 | sshdr.sense_key == ILLEGAL_REQUEST && |
2461 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) |
2462 | /* Invalid field in CDB */ |
2463 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); |
2464 | else |
2465 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
2466 | |
2467 | defaults: |
2468 | if (sdp->wce_default_on) { |
2469 | sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n"); |
2470 | sdkp->WCE = 1; |
2471 | } else { |
2472 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
2473 | sdkp->WCE = 0; |
2474 | } |
2475 | sdkp->RCD = 0; |
2476 | sdkp->DPOFUA = 0; |
2477 | } |
2478 | |
2479 | /* |
2480 | * The ATO bit indicates whether the DIF application tag is available |
2481 | * for use by the operating system. |
2482 | */ |
2483 | static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) |
2484 | { |
2485 | int res, offset; |
2486 | struct scsi_device *sdp = sdkp->device; |
2487 | struct scsi_mode_data data; |
2488 | struct scsi_sense_hdr sshdr; |
2489 | |
2490 | if (sdp->type != TYPE_DISK) |
2491 | return; |
2492 | |
2493 | if (sdkp->protection_type == 0) |
2494 | return; |
2495 | |
2496 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, |
2497 | SD_MAX_RETRIES, &data, &sshdr); |
2498 | |
2499 | if (!scsi_status_is_good(res) || !data.header_length || |
2500 | data.length < 6) { |
2501 | sd_printk(KERN_WARNING, sdkp, |
2502 | "getting Control mode page failed, assume no ATO\n"); |
2503 | |
2504 | if (scsi_sense_valid(&sshdr)) |
2505 | sd_print_sense_hdr(sdkp, &sshdr); |
2506 | |
2507 | return; |
2508 | } |
2509 | |
2510 | offset = data.header_length + data.block_descriptor_length; |
2511 | |
2512 | if ((buffer[offset] & 0x3f) != 0x0a) { |
2513 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); |
2514 | return; |
2515 | } |
2516 | |
2517 | if ((buffer[offset + 5] & 0x80) == 0) |
2518 | return; |
2519 | |
2520 | sdkp->ATO = 1; |
2521 | |
2522 | return; |
2523 | } |
2524 | |
2525 | /** |
2526 | * sd_read_block_limits - Query disk device for preferred I/O sizes. |
2527 | * @disk: disk to query |
2528 | */ |
2529 | static void sd_read_block_limits(struct scsi_disk *sdkp) |
2530 | { |
2531 | unsigned int sector_sz = sdkp->device->sector_size; |
2532 | const int vpd_len = 64; |
2533 | unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); |
2534 | |
2535 | if (!buffer || |
2536 | /* Block Limits VPD */ |
2537 | scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) |
2538 | goto out; |
2539 | |
2540 | blk_queue_io_min(sdkp->disk->queue, |
2541 | get_unaligned_be16(&buffer[6]) * sector_sz); |
2542 | blk_queue_io_opt(sdkp->disk->queue, |
2543 | get_unaligned_be32(&buffer[12]) * sector_sz); |
2544 | |
2545 | if (buffer[3] == 0x3c) { |
2546 | unsigned int lba_count, desc_count; |
2547 | |
2548 | sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); |
2549 | |
2550 | if (!sdkp->lbpme) |
2551 | goto out; |
2552 | |
2553 | lba_count = get_unaligned_be32(&buffer[20]); |
2554 | desc_count = get_unaligned_be32(&buffer[24]); |
2555 | |
2556 | if (lba_count && desc_count) |
2557 | sdkp->max_unmap_blocks = lba_count; |
2558 | |
2559 | sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); |
2560 | |
2561 | if (buffer[32] & 0x80) |
2562 | sdkp->unmap_alignment = |
2563 | get_unaligned_be32(&buffer[32]) & ~(1 << 31); |
2564 | |
2565 | if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ |
2566 | |
2567 | if (sdkp->max_unmap_blocks) |
2568 | sd_config_discard(sdkp, SD_LBP_UNMAP); |
2569 | else |
2570 | sd_config_discard(sdkp, SD_LBP_WS16); |
2571 | |
2572 | } else { /* LBP VPD page tells us what to use */ |
2573 | |
2574 | if (sdkp->lbpu && sdkp->max_unmap_blocks) |
2575 | sd_config_discard(sdkp, SD_LBP_UNMAP); |
2576 | else if (sdkp->lbpws) |
2577 | sd_config_discard(sdkp, SD_LBP_WS16); |
2578 | else if (sdkp->lbpws10) |
2579 | sd_config_discard(sdkp, SD_LBP_WS10); |
2580 | else |
2581 | sd_config_discard(sdkp, SD_LBP_DISABLE); |
2582 | } |
2583 | } |
2584 | |
2585 | out: |
2586 | kfree(buffer); |
2587 | } |
2588 | |
2589 | /** |
2590 | * sd_read_block_characteristics - Query block dev. characteristics |
2591 | * @disk: disk to query |
2592 | */ |
2593 | static void sd_read_block_characteristics(struct scsi_disk *sdkp) |
2594 | { |
2595 | unsigned char *buffer; |
2596 | u16 rot; |
2597 | const int vpd_len = 64; |
2598 | |
2599 | buffer = kmalloc(vpd_len, GFP_KERNEL); |
2600 | |
2601 | if (!buffer || |
2602 | /* Block Device Characteristics VPD */ |
2603 | scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) |
2604 | goto out; |
2605 | |
2606 | rot = get_unaligned_be16(&buffer[4]); |
2607 | |
2608 | if (rot == 1) |
2609 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); |
2610 | |
2611 | out: |
2612 | kfree(buffer); |
2613 | } |
2614 | |
2615 | /** |
2616 | * sd_read_block_provisioning - Query provisioning VPD page |
2617 | * @disk: disk to query |
2618 | */ |
2619 | static void sd_read_block_provisioning(struct scsi_disk *sdkp) |
2620 | { |
2621 | unsigned char *buffer; |
2622 | const int vpd_len = 8; |
2623 | |
2624 | if (sdkp->lbpme == 0) |
2625 | return; |
2626 | |
2627 | buffer = kmalloc(vpd_len, GFP_KERNEL); |
2628 | |
2629 | if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) |
2630 | goto out; |
2631 | |
2632 | sdkp->lbpvpd = 1; |
2633 | sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ |
2634 | sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ |
2635 | sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ |
2636 | |
2637 | out: |
2638 | kfree(buffer); |
2639 | } |
2640 | |
2641 | static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) |
2642 | { |
2643 | struct scsi_device *sdev = sdkp->device; |
2644 | |
2645 | if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { |
2646 | sdev->no_report_opcodes = 1; |
2647 | |
2648 | /* Disable WRITE SAME if REPORT SUPPORTED OPERATION |
2649 | * CODES is unsupported and the device has an ATA |
2650 | * Information VPD page (SAT). |
2651 | */ |
2652 | if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE)) |
2653 | sdev->no_write_same = 1; |
2654 | } |
2655 | |
2656 | if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) |
2657 | sdkp->ws16 = 1; |
2658 | |
2659 | if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) |
2660 | sdkp->ws10 = 1; |
2661 | } |
2662 | |
2663 | static int sd_try_extended_inquiry(struct scsi_device *sdp) |
2664 | { |
2665 | /* |
2666 | * Although VPD inquiries can go to SCSI-2 type devices, |
2667 | * some USB ones crash on receiving them, and the pages |
2668 | * we currently ask for are for SPC-3 and beyond |
2669 | */ |
2670 | if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) |
2671 | return 1; |
2672 | return 0; |
2673 | } |
2674 | |
2675 | /** |
2676 | * sd_revalidate_disk - called the first time a new disk is seen, |
2677 | * performs disk spin up, read_capacity, etc. |
2678 | * @disk: struct gendisk we care about |
2679 | **/ |
2680 | static int sd_revalidate_disk(struct gendisk *disk) |
2681 | { |
2682 | struct scsi_disk *sdkp = scsi_disk(disk); |
2683 | struct scsi_device *sdp = sdkp->device; |
2684 | unsigned char *buffer; |
2685 | unsigned flush = 0; |
2686 | |
2687 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
2688 | "sd_revalidate_disk\n")); |
2689 | |
2690 | /* |
2691 | * If the device is offline, don't try and read capacity or any |
2692 | * of the other niceties. |
2693 | */ |
2694 | if (!scsi_device_online(sdp)) |
2695 | goto out; |
2696 | |
2697 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
2698 | if (!buffer) { |
2699 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
2700 | "allocation failure.\n"); |
2701 | goto out; |
2702 | } |
2703 | |
2704 | sd_spinup_disk(sdkp); |
2705 | |
2706 | /* |
2707 | * Without media there is no reason to ask; moreover, some devices |
2708 | * react badly if we do. |
2709 | */ |
2710 | if (sdkp->media_present) { |
2711 | sd_read_capacity(sdkp, buffer); |
2712 | |
2713 | if (sd_try_extended_inquiry(sdp)) { |
2714 | sd_read_block_provisioning(sdkp); |
2715 | sd_read_block_limits(sdkp); |
2716 | sd_read_block_characteristics(sdkp); |
2717 | } |
2718 | |
2719 | sd_read_write_protect_flag(sdkp, buffer); |
2720 | sd_read_cache_type(sdkp, buffer); |
2721 | sd_read_app_tag_own(sdkp, buffer); |
2722 | sd_read_write_same(sdkp, buffer); |
2723 | } |
2724 | |
2725 | sdkp->first_scan = 0; |
2726 | |
2727 | /* |
2728 | * We now have all cache related info, determine how we deal |
2729 | * with flush requests. |
2730 | */ |
2731 | if (sdkp->WCE) { |
2732 | flush |= REQ_FLUSH; |
2733 | if (sdkp->DPOFUA) |
2734 | flush |= REQ_FUA; |
2735 | } |
2736 | |
2737 | blk_queue_flush(sdkp->disk->queue, flush); |
2738 | |
2739 | set_capacity(disk, sdkp->capacity); |
2740 | sd_config_write_same(sdkp); |
2741 | kfree(buffer); |
2742 | |
2743 | out: |
2744 | return 0; |
2745 | } |
2746 | |
2747 | /** |
2748 | * sd_unlock_native_capacity - unlock native capacity |
2749 | * @disk: struct gendisk to set capacity for |
2750 | * |
2751 | * Block layer calls this function if it detects that partitions |
2752 | * on @disk reach beyond the end of the device. If the SCSI host |
2753 | * implements ->unlock_native_capacity() method, it's invoked to |
2754 | * give it a chance to adjust the device capacity. |
2755 | * |
2756 | * CONTEXT: |
2757 | * Defined by block layer. Might sleep. |
2758 | */ |
2759 | static void sd_unlock_native_capacity(struct gendisk *disk) |
2760 | { |
2761 | struct scsi_device *sdev = scsi_disk(disk)->device; |
2762 | |
2763 | if (sdev->host->hostt->unlock_native_capacity) |
2764 | sdev->host->hostt->unlock_native_capacity(sdev); |
2765 | } |
2766 | |
2767 | /** |
2768 | * sd_format_disk_name - format disk name |
2769 | * @prefix: name prefix - ie. "sd" for SCSI disks |
2770 | * @index: index of the disk to format name for |
2771 | * @buf: output buffer |
2772 | * @buflen: length of the output buffer |
2773 | * |
2774 | * SCSI disk names starts at sda. The 26th device is sdz and the |
2775 | * 27th is sdaa. The last one for two lettered suffix is sdzz |
2776 | * which is followed by sdaaa. |
2777 | * |
2778 | * This is basically 26 base counting with one extra 'nil' entry |
2779 | * at the beginning from the second digit on and can be |
2780 | * determined using similar method as 26 base conversion with the |
2781 | * index shifted -1 after each digit is computed. |
2782 | * |
2783 | * CONTEXT: |
2784 | * Don't care. |
2785 | * |
2786 | * RETURNS: |
2787 | * 0 on success, -errno on failure. |
2788 | */ |
2789 | static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) |
2790 | { |
2791 | const int base = 'z' - 'a' + 1; |
2792 | char *begin = buf + strlen(prefix); |
2793 | char *end = buf + buflen; |
2794 | char *p; |
2795 | int unit; |
2796 | |
2797 | p = end - 1; |
2798 | *p = '\0'; |
2799 | unit = base; |
2800 | do { |
2801 | if (p == begin) |
2802 | return -EINVAL; |
2803 | *--p = 'a' + (index % unit); |
2804 | index = (index / unit) - 1; |
2805 | } while (index >= 0); |
2806 | |
2807 | memmove(begin, p, end - p); |
2808 | memcpy(buf, prefix, strlen(prefix)); |
2809 | |
2810 | return 0; |
2811 | } |
2812 | |
2813 | /* |
2814 | * The asynchronous part of sd_probe |
2815 | */ |
2816 | static void sd_probe_async(void *data, async_cookie_t cookie) |
2817 | { |
2818 | struct scsi_disk *sdkp = data; |
2819 | struct scsi_device *sdp; |
2820 | struct gendisk *gd; |
2821 | u32 index; |
2822 | struct device *dev; |
2823 | |
2824 | sdp = sdkp->device; |
2825 | gd = sdkp->disk; |
2826 | index = sdkp->index; |
2827 | dev = &sdp->sdev_gendev; |
2828 | |
2829 | gd->major = sd_major((index & 0xf0) >> 4); |
2830 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); |
2831 | gd->minors = SD_MINORS; |
2832 | |
2833 | gd->fops = &sd_fops; |
2834 | gd->private_data = &sdkp->driver; |
2835 | gd->queue = sdkp->device->request_queue; |
2836 | |
2837 | /* defaults, until the device tells us otherwise */ |
2838 | sdp->sector_size = 512; |
2839 | sdkp->capacity = 0; |
2840 | sdkp->media_present = 1; |
2841 | sdkp->write_prot = 0; |
2842 | sdkp->cache_override = 0; |
2843 | sdkp->WCE = 0; |
2844 | sdkp->RCD = 0; |
2845 | sdkp->ATO = 0; |
2846 | sdkp->first_scan = 1; |
2847 | sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; |
2848 | |
2849 | sd_revalidate_disk(gd); |
2850 | |
2851 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); |
2852 | blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); |
2853 | |
2854 | gd->driverfs_dev = &sdp->sdev_gendev; |
2855 | gd->flags = GENHD_FL_EXT_DEVT; |
2856 | if (sdp->removable) { |
2857 | gd->flags |= GENHD_FL_REMOVABLE; |
2858 | gd->events |= DISK_EVENT_MEDIA_CHANGE; |
2859 | } |
2860 | |
2861 | add_disk(gd); |
2862 | if (sdkp->capacity) |
2863 | sd_dif_config_host(sdkp); |
2864 | |
2865 | sd_revalidate_disk(gd); |
2866 | |
2867 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
2868 | sdp->removable ? "removable " : ""); |
2869 | blk_pm_runtime_init(sdp->request_queue, dev); |
2870 | scsi_autopm_put_device(sdp); |
2871 | put_device(&sdkp->dev); |
2872 | } |
2873 | |
2874 | /** |
2875 | * sd_probe - called during driver initialization and whenever a |
2876 | * new scsi device is attached to the system. It is called once |
2877 | * for each scsi device (not just disks) present. |
2878 | * @dev: pointer to device object |
2879 | * |
2880 | * Returns 0 if successful (or not interested in this scsi device |
2881 | * (e.g. scanner)); 1 when there is an error. |
2882 | * |
2883 | * Note: this function is invoked from the scsi mid-level. |
2884 | * This function sets up the mapping between a given |
2885 | * <host,channel,id,lun> (found in sdp) and new device name |
2886 | * (e.g. /dev/sda). More precisely it is the block device major |
2887 | * and minor number that is chosen here. |
2888 | * |
2889 | * Assume sd_probe is not re-entrant (for time being) |
2890 | * Also think about sd_probe() and sd_remove() running coincidentally. |
2891 | **/ |
2892 | static int sd_probe(struct device *dev) |
2893 | { |
2894 | struct scsi_device *sdp = to_scsi_device(dev); |
2895 | struct scsi_disk *sdkp; |
2896 | struct gendisk *gd; |
2897 | int index; |
2898 | int error; |
2899 | |
2900 | error = -ENODEV; |
2901 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
2902 | goto out; |
2903 | |
2904 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
2905 | "sd_probe\n")); |
2906 | |
2907 | error = -ENOMEM; |
2908 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
2909 | if (!sdkp) |
2910 | goto out; |
2911 | |
2912 | gd = alloc_disk(SD_MINORS); |
2913 | if (!gd) |
2914 | goto out_free; |
2915 | |
2916 | do { |
2917 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) |
2918 | goto out_put; |
2919 | |
2920 | spin_lock(&sd_index_lock); |
2921 | error = ida_get_new(&sd_index_ida, &index); |
2922 | spin_unlock(&sd_index_lock); |
2923 | } while (error == -EAGAIN); |
2924 | |
2925 | if (error) { |
2926 | sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); |
2927 | goto out_put; |
2928 | } |
2929 | |
2930 | error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
2931 | if (error) { |
2932 | sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); |
2933 | goto out_free_index; |
2934 | } |
2935 | |
2936 | sdkp->device = sdp; |
2937 | sdkp->driver = &sd_template; |
2938 | sdkp->disk = gd; |
2939 | sdkp->index = index; |
2940 | atomic_set(&sdkp->openers, 0); |
2941 | atomic_set(&sdkp->device->ioerr_cnt, 0); |
2942 | |
2943 | if (!sdp->request_queue->rq_timeout) { |
2944 | if (sdp->type != TYPE_MOD) |
2945 | blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); |
2946 | else |
2947 | blk_queue_rq_timeout(sdp->request_queue, |
2948 | SD_MOD_TIMEOUT); |
2949 | } |
2950 | |
2951 | device_initialize(&sdkp->dev); |
2952 | sdkp->dev.parent = dev; |
2953 | sdkp->dev.class = &sd_disk_class; |
2954 | dev_set_name(&sdkp->dev, "%s", dev_name(dev)); |
2955 | |
2956 | if (device_add(&sdkp->dev)) |
2957 | goto out_free_index; |
2958 | |
2959 | get_device(dev); |
2960 | dev_set_drvdata(dev, sdkp); |
2961 | |
2962 | get_device(&sdkp->dev); /* prevent release before async_schedule */ |
2963 | async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); |
2964 | |
2965 | return 0; |
2966 | |
2967 | out_free_index: |
2968 | spin_lock(&sd_index_lock); |
2969 | ida_remove(&sd_index_ida, index); |
2970 | spin_unlock(&sd_index_lock); |
2971 | out_put: |
2972 | put_disk(gd); |
2973 | out_free: |
2974 | kfree(sdkp); |
2975 | out: |
2976 | return error; |
2977 | } |
2978 | |
2979 | /** |
2980 | * sd_remove - called whenever a scsi disk (previously recognized by |
2981 | * sd_probe) is detached from the system. It is called (potentially |
2982 | * multiple times) during sd module unload. |
2983 | * @sdp: pointer to mid level scsi device object |
2984 | * |
2985 | * Note: this function is invoked from the scsi mid-level. |
2986 | * This function potentially frees up a device name (e.g. /dev/sdc) |
2987 | * that could be re-used by a subsequent sd_probe(). |
2988 | * This function is not called when the built-in sd driver is "exit-ed". |
2989 | **/ |
2990 | static int sd_remove(struct device *dev) |
2991 | { |
2992 | struct scsi_disk *sdkp; |
2993 | dev_t devt; |
2994 | |
2995 | sdkp = dev_get_drvdata(dev); |
2996 | devt = disk_devt(sdkp->disk); |
2997 | scsi_autopm_get_device(sdkp->device); |
2998 | |
2999 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
3000 | blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); |
3001 | blk_queue_unprep_rq(sdkp->device->request_queue, NULL); |
3002 | device_del(&sdkp->dev); |
3003 | del_gendisk(sdkp->disk); |
3004 | sd_shutdown(dev); |
3005 | |
3006 | blk_register_region(devt, SD_MINORS, NULL, |
3007 | sd_default_probe, NULL, NULL); |
3008 | |
3009 | mutex_lock(&sd_ref_mutex); |
3010 | dev_set_drvdata(dev, NULL); |
3011 | put_device(&sdkp->dev); |
3012 | mutex_unlock(&sd_ref_mutex); |
3013 | |
3014 | return 0; |
3015 | } |
3016 | |
3017 | /** |
3018 | * scsi_disk_release - Called to free the scsi_disk structure |
3019 | * @dev: pointer to embedded class device |
3020 | * |
3021 | * sd_ref_mutex must be held entering this routine. Because it is |
3022 | * called on last put, you should always use the scsi_disk_get() |
3023 | * scsi_disk_put() helpers which manipulate the semaphore directly |
3024 | * and never do a direct put_device. |
3025 | **/ |
3026 | static void scsi_disk_release(struct device *dev) |
3027 | { |
3028 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
3029 | struct gendisk *disk = sdkp->disk; |
3030 | |
3031 | spin_lock(&sd_index_lock); |
3032 | ida_remove(&sd_index_ida, sdkp->index); |
3033 | spin_unlock(&sd_index_lock); |
3034 | |
3035 | disk->private_data = NULL; |
3036 | put_disk(disk); |
3037 | put_device(&sdkp->device->sdev_gendev); |
3038 | |
3039 | kfree(sdkp); |
3040 | } |
3041 | |
3042 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
3043 | { |
3044 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ |
3045 | struct scsi_sense_hdr sshdr; |
3046 | struct scsi_device *sdp = sdkp->device; |
3047 | int res; |
3048 | |
3049 | if (start) |
3050 | cmd[4] |= 1; /* START */ |
3051 | |
3052 | if (sdp->start_stop_pwr_cond) |
3053 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ |
3054 | |
3055 | if (!scsi_device_online(sdp)) |
3056 | return -ENODEV; |
3057 | |
3058 | res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
3059 | SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); |
3060 | if (res) { |
3061 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
3062 | sd_print_result(sdkp, res); |
3063 | if (driver_byte(res) & DRIVER_SENSE) |
3064 | sd_print_sense_hdr(sdkp, &sshdr); |
3065 | } |
3066 | |
3067 | return res; |
3068 | } |
3069 | |
3070 | /* |
3071 | * Send a SYNCHRONIZE CACHE instruction down to the device through |
3072 | * the normal SCSI command structure. Wait for the command to |
3073 | * complete. |
3074 | */ |
3075 | static void sd_shutdown(struct device *dev) |
3076 | { |
3077 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
3078 | |
3079 | if (!sdkp) |
3080 | return; /* this can happen */ |
3081 | |
3082 | if (pm_runtime_suspended(dev)) |
3083 | goto exit; |
3084 | |
3085 | if (sdkp->WCE) { |
3086 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
3087 | sd_sync_cache(sdkp); |
3088 | } |
3089 | |
3090 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
3091 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
3092 | sd_start_stop_device(sdkp, 0); |
3093 | } |
3094 | |
3095 | exit: |
3096 | scsi_disk_put(sdkp); |
3097 | } |
3098 | |
3099 | static int sd_suspend(struct device *dev) |
3100 | { |
3101 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
3102 | int ret = 0; |
3103 | |
3104 | if (!sdkp) |
3105 | return 0; /* this can happen */ |
3106 | |
3107 | if (sdkp->WCE) { |
3108 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
3109 | ret = sd_sync_cache(sdkp); |
3110 | if (ret) |
3111 | goto done; |
3112 | } |
3113 | |
3114 | if (sdkp->device->manage_start_stop) { |
3115 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
3116 | ret = sd_start_stop_device(sdkp, 0); |
3117 | } |
3118 | |
3119 | done: |
3120 | scsi_disk_put(sdkp); |
3121 | return ret; |
3122 | } |
3123 | |
3124 | static int sd_resume(struct device *dev) |
3125 | { |
3126 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
3127 | int ret = 0; |
3128 | |
3129 | if (!sdkp->device->manage_start_stop) |
3130 | goto done; |
3131 | |
3132 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
3133 | ret = sd_start_stop_device(sdkp, 1); |
3134 | |
3135 | done: |
3136 | scsi_disk_put(sdkp); |
3137 | return ret; |
3138 | } |
3139 | |
3140 | /** |
3141 | * init_sd - entry point for this driver (both when built in or when |
3142 | * a module). |
3143 | * |
3144 | * Note: this function registers this driver with the scsi mid-level. |
3145 | **/ |
3146 | static int __init init_sd(void) |
3147 | { |
3148 | int majors = 0, i, err; |
3149 | |
3150 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); |
3151 | |
3152 | for (i = 0; i < SD_MAJORS; i++) { |
3153 | if (register_blkdev(sd_major(i), "sd") != 0) |
3154 | continue; |
3155 | majors++; |
3156 | blk_register_region(sd_major(i), SD_MINORS, NULL, |
3157 | sd_default_probe, NULL, NULL); |
3158 | } |
3159 | |
3160 | if (!majors) |
3161 | return -ENODEV; |
3162 | |
3163 | err = class_register(&sd_disk_class); |
3164 | if (err) |
3165 | goto err_out; |
3166 | |
3167 | sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, |
3168 | 0, 0, NULL); |
3169 | if (!sd_cdb_cache) { |
3170 | printk(KERN_ERR "sd: can't init extended cdb cache\n"); |
3171 | goto err_out_class; |
3172 | } |
3173 | |
3174 | sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); |
3175 | if (!sd_cdb_pool) { |
3176 | printk(KERN_ERR "sd: can't init extended cdb pool\n"); |
3177 | goto err_out_cache; |
3178 | } |
3179 | |
3180 | err = scsi_register_driver(&sd_template.gendrv); |
3181 | if (err) |
3182 | goto err_out_driver; |
3183 | |
3184 | return 0; |
3185 | |
3186 | err_out_driver: |
3187 | mempool_destroy(sd_cdb_pool); |
3188 | |
3189 | err_out_cache: |
3190 | kmem_cache_destroy(sd_cdb_cache); |
3191 | |
3192 | err_out_class: |
3193 | class_unregister(&sd_disk_class); |
3194 | err_out: |
3195 | for (i = 0; i < SD_MAJORS; i++) |
3196 | unregister_blkdev(sd_major(i), "sd"); |
3197 | return err; |
3198 | } |
3199 | |
3200 | /** |
3201 | * exit_sd - exit point for this driver (when it is a module). |
3202 | * |
3203 | * Note: this function unregisters this driver from the scsi mid-level. |
3204 | **/ |
3205 | static void __exit exit_sd(void) |
3206 | { |
3207 | int i; |
3208 | |
3209 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); |
3210 | |
3211 | scsi_unregister_driver(&sd_template.gendrv); |
3212 | mempool_destroy(sd_cdb_pool); |
3213 | kmem_cache_destroy(sd_cdb_cache); |
3214 | |
3215 | class_unregister(&sd_disk_class); |
3216 | |
3217 | for (i = 0; i < SD_MAJORS; i++) { |
3218 | blk_unregister_region(sd_major(i), SD_MINORS); |
3219 | unregister_blkdev(sd_major(i), "sd"); |
3220 | } |
3221 | } |
3222 | |
3223 | module_init(init_sd); |
3224 | module_exit(exit_sd); |
3225 | |
3226 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, |
3227 | struct scsi_sense_hdr *sshdr) |
3228 | { |
3229 | sd_printk(KERN_INFO, sdkp, " "); |
3230 | scsi_show_sense_hdr(sshdr); |
3231 | sd_printk(KERN_INFO, sdkp, " "); |
3232 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); |
3233 | } |
3234 | |
3235 | static void sd_print_result(struct scsi_disk *sdkp, int result) |
3236 | { |
3237 | sd_printk(KERN_INFO, sdkp, " "); |
3238 | scsi_show_result(result); |
3239 | } |
3240 | |
3241 |
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