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vmwgfx: Fix assignment in vmw_framebuffer_create_handle
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / sd.c
blob4b63c732807dd20f0c4c831e9fac4945eb92270a
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 <asm/uaccess.h>
54 #include <asm/unaligned.h>
55
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
65
66 #include "sd.h"
67 #include "scsi_logging.h"
68
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
72
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
92
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
94 #define SD_MINORS 16
95 #else
96 #define SD_MINORS 0
97 #endif
98
99 static void sd_config_discard(struct scsi_disk *, unsigned int);
100 static int sd_revalidate_disk(struct gendisk *);
101 static void sd_unlock_native_capacity(struct gendisk *disk);
102 static int sd_probe(struct device *);
103 static int sd_remove(struct device *);
104 static void sd_shutdown(struct device *);
105 static int sd_suspend(struct device *, pm_message_t state);
106 static int sd_resume(struct device *);
107 static void sd_rescan(struct device *);
108 static int sd_done(struct scsi_cmnd *);
109 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
110 static void scsi_disk_release(struct device *cdev);
111 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112 static void sd_print_result(struct scsi_disk *, int);
113
114 static DEFINE_SPINLOCK(sd_index_lock);
115 static DEFINE_IDA(sd_index_ida);
116
117 /* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120 static DEFINE_MUTEX(sd_ref_mutex);
121
122 static struct kmem_cache *sd_cdb_cache;
123 static mempool_t *sd_cdb_pool;
124
125 static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
128 };
129
130 static ssize_t
131 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
133 {
134 int i, ct = -1, rcd, wce, sp;
135 struct scsi_disk *sdkp = to_scsi_disk(dev);
136 struct scsi_device *sdp = sdkp->device;
137 char buffer[64];
138 char *buffer_data;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
141 int len;
142
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
147 return -EINVAL;
148
149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
150 len = strlen(sd_cache_types[i]);
151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
152 buf[len] == '\n') {
153 ct = i;
154 break;
155 }
156 }
157 if (ct < 0)
158 return -EINVAL;
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
163 return -EINVAL;
164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
171
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
175 sd_print_sense_hdr(sdkp, &sshdr);
176 return -EINVAL;
177 }
178 revalidate_disk(sdkp->disk);
179 return count;
180 }
181
182 static ssize_t
183 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
185 {
186 struct scsi_disk *sdkp = to_scsi_disk(dev);
187 struct scsi_device *sdp = sdkp->device;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EACCES;
191
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
193
194 return count;
195 }
196
197 static ssize_t
198 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
200 {
201 struct scsi_disk *sdkp = to_scsi_disk(dev);
202 struct scsi_device *sdp = sdkp->device;
203
204 if (!capable(CAP_SYS_ADMIN))
205 return -EACCES;
206
207 if (sdp->type != TYPE_DISK)
208 return -EINVAL;
209
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
211
212 return count;
213 }
214
215 static ssize_t
216 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
217 char *buf)
218 {
219 struct scsi_disk *sdkp = to_scsi_disk(dev);
220 int ct = sdkp->RCD + 2*sdkp->WCE;
221
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
223 }
224
225 static ssize_t
226 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
227 {
228 struct scsi_disk *sdkp = to_scsi_disk(dev);
229
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
231 }
232
233 static ssize_t
234 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
235 char *buf)
236 {
237 struct scsi_disk *sdkp = to_scsi_disk(dev);
238 struct scsi_device *sdp = sdkp->device;
239
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
241 }
242
243 static ssize_t
244 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
245 char *buf)
246 {
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250 }
251
252 static ssize_t
253 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
254 char *buf)
255 {
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259 }
260
261 static ssize_t
262 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
263 char *buf)
264 {
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 struct scsi_device *sdp = sdkp->device;
267 unsigned int dif, dix;
268
269 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
270 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
271
272 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
273 dif = 0;
274 dix = 1;
275 }
276
277 if (!dif && !dix)
278 return snprintf(buf, 20, "none\n");
279
280 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
281 }
282
283 static ssize_t
284 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
285 char *buf)
286 {
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
288
289 return snprintf(buf, 20, "%u\n", sdkp->ATO);
290 }
291
292 static ssize_t
293 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
294 char *buf)
295 {
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
299 }
300
301 static const char *lbp_mode[] = {
302 [SD_LBP_FULL] = "full",
303 [SD_LBP_UNMAP] = "unmap",
304 [SD_LBP_WS16] = "writesame_16",
305 [SD_LBP_WS10] = "writesame_10",
306 [SD_LBP_ZERO] = "writesame_zero",
307 [SD_LBP_DISABLE] = "disabled",
308 };
309
310 static ssize_t
311 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
312 char *buf)
313 {
314 struct scsi_disk *sdkp = to_scsi_disk(dev);
315
316 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
317 }
318
319 static ssize_t
320 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
321 const char *buf, size_t count)
322 {
323 struct scsi_disk *sdkp = to_scsi_disk(dev);
324 struct scsi_device *sdp = sdkp->device;
325
326 if (!capable(CAP_SYS_ADMIN))
327 return -EACCES;
328
329 if (sdp->type != TYPE_DISK)
330 return -EINVAL;
331
332 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
333 sd_config_discard(sdkp, SD_LBP_UNMAP);
334 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
335 sd_config_discard(sdkp, SD_LBP_WS16);
336 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
337 sd_config_discard(sdkp, SD_LBP_WS10);
338 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
339 sd_config_discard(sdkp, SD_LBP_ZERO);
340 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
341 sd_config_discard(sdkp, SD_LBP_DISABLE);
342 else
343 return -EINVAL;
344
345 return count;
346 }
347
348 static struct device_attribute sd_disk_attrs[] = {
349 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
350 sd_store_cache_type),
351 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
352 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
353 sd_store_allow_restart),
354 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
355 sd_store_manage_start_stop),
356 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
357 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
358 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
359 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
360 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
361 sd_store_provisioning_mode),
362 __ATTR_NULL,
363 };
364
365 static struct class sd_disk_class = {
366 .name = "scsi_disk",
367 .owner = THIS_MODULE,
368 .dev_release = scsi_disk_release,
369 .dev_attrs = sd_disk_attrs,
370 };
371
372 static struct scsi_driver sd_template = {
373 .owner = THIS_MODULE,
374 .gendrv = {
375 .name = "sd",
376 .probe = sd_probe,
377 .remove = sd_remove,
378 .suspend = sd_suspend,
379 .resume = sd_resume,
380 .shutdown = sd_shutdown,
381 },
382 .rescan = sd_rescan,
383 .done = sd_done,
384 };
385
386 /*
387 * Device no to disk mapping:
388 *
389 * major disc2 disc p1
390 * |............|.............|....|....| <- dev_t
391 * 31 20 19 8 7 4 3 0
392 *
393 * Inside a major, we have 16k disks, however mapped non-
394 * contiguously. The first 16 disks are for major0, the next
395 * ones with major1, ... Disk 256 is for major0 again, disk 272
396 * for major1, ...
397 * As we stay compatible with our numbering scheme, we can reuse
398 * the well-know SCSI majors 8, 65--71, 136--143.
399 */
400 static int sd_major(int major_idx)
401 {
402 switch (major_idx) {
403 case 0:
404 return SCSI_DISK0_MAJOR;
405 case 1 ... 7:
406 return SCSI_DISK1_MAJOR + major_idx - 1;
407 case 8 ... 15:
408 return SCSI_DISK8_MAJOR + major_idx - 8;
409 default:
410 BUG();
411 return 0; /* shut up gcc */
412 }
413 }
414
415 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
416 {
417 struct scsi_disk *sdkp = NULL;
418
419 if (disk->private_data) {
420 sdkp = scsi_disk(disk);
421 if (scsi_device_get(sdkp->device) == 0)
422 get_device(&sdkp->dev);
423 else
424 sdkp = NULL;
425 }
426 return sdkp;
427 }
428
429 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
430 {
431 struct scsi_disk *sdkp;
432
433 mutex_lock(&sd_ref_mutex);
434 sdkp = __scsi_disk_get(disk);
435 mutex_unlock(&sd_ref_mutex);
436 return sdkp;
437 }
438
439 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
440 {
441 struct scsi_disk *sdkp;
442
443 mutex_lock(&sd_ref_mutex);
444 sdkp = dev_get_drvdata(dev);
445 if (sdkp)
446 sdkp = __scsi_disk_get(sdkp->disk);
447 mutex_unlock(&sd_ref_mutex);
448 return sdkp;
449 }
450
451 static void scsi_disk_put(struct scsi_disk *sdkp)
452 {
453 struct scsi_device *sdev = sdkp->device;
454
455 mutex_lock(&sd_ref_mutex);
456 put_device(&sdkp->dev);
457 scsi_device_put(sdev);
458 mutex_unlock(&sd_ref_mutex);
459 }
460
461 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
462 {
463 unsigned int prot_op = SCSI_PROT_NORMAL;
464 unsigned int dix = scsi_prot_sg_count(scmd);
465
466 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
467 if (dif && dix)
468 prot_op = SCSI_PROT_READ_PASS;
469 else if (dif && !dix)
470 prot_op = SCSI_PROT_READ_STRIP;
471 else if (!dif && dix)
472 prot_op = SCSI_PROT_READ_INSERT;
473 } else {
474 if (dif && dix)
475 prot_op = SCSI_PROT_WRITE_PASS;
476 else if (dif && !dix)
477 prot_op = SCSI_PROT_WRITE_INSERT;
478 else if (!dif && dix)
479 prot_op = SCSI_PROT_WRITE_STRIP;
480 }
481
482 scsi_set_prot_op(scmd, prot_op);
483 scsi_set_prot_type(scmd, dif);
484 }
485
486 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
487 {
488 struct request_queue *q = sdkp->disk->queue;
489 unsigned int logical_block_size = sdkp->device->sector_size;
490 unsigned int max_blocks = 0;
491
492 q->limits.discard_zeroes_data = sdkp->lbprz;
493 q->limits.discard_alignment = sdkp->unmap_alignment *
494 logical_block_size;
495 q->limits.discard_granularity =
496 max(sdkp->physical_block_size,
497 sdkp->unmap_granularity * logical_block_size);
498
499 switch (mode) {
500
501 case SD_LBP_DISABLE:
502 q->limits.max_discard_sectors = 0;
503 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
504 return;
505
506 case SD_LBP_UNMAP:
507 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
508 break;
509
510 case SD_LBP_WS16:
511 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
512 break;
513
514 case SD_LBP_WS10:
515 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
516 break;
517
518 case SD_LBP_ZERO:
519 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
520 q->limits.discard_zeroes_data = 1;
521 break;
522 }
523
524 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
525 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
526
527 sdkp->provisioning_mode = mode;
528 }
529
530 /**
531 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
532 * @sdp: scsi device to operate one
533 * @rq: Request to prepare
534 *
535 * Will issue either UNMAP or WRITE SAME(16) depending on preference
536 * indicated by target device.
537 **/
538 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
539 {
540 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
541 struct bio *bio = rq->bio;
542 sector_t sector = bio->bi_sector;
543 unsigned int nr_sectors = bio_sectors(bio);
544 unsigned int len;
545 int ret;
546 char *buf;
547 struct page *page;
548
549 if (sdkp->device->sector_size == 4096) {
550 sector >>= 3;
551 nr_sectors >>= 3;
552 }
553
554 rq->timeout = SD_TIMEOUT;
555
556 memset(rq->cmd, 0, rq->cmd_len);
557
558 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
559 if (!page)
560 return BLKPREP_DEFER;
561
562 switch (sdkp->provisioning_mode) {
563 case SD_LBP_UNMAP:
564 buf = page_address(page);
565
566 rq->cmd_len = 10;
567 rq->cmd[0] = UNMAP;
568 rq->cmd[8] = 24;
569
570 put_unaligned_be16(6 + 16, &buf[0]);
571 put_unaligned_be16(16, &buf[2]);
572 put_unaligned_be64(sector, &buf[8]);
573 put_unaligned_be32(nr_sectors, &buf[16]);
574
575 len = 24;
576 break;
577
578 case SD_LBP_WS16:
579 rq->cmd_len = 16;
580 rq->cmd[0] = WRITE_SAME_16;
581 rq->cmd[1] = 0x8; /* UNMAP */
582 put_unaligned_be64(sector, &rq->cmd[2]);
583 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
584
585 len = sdkp->device->sector_size;
586 break;
587
588 case SD_LBP_WS10:
589 case SD_LBP_ZERO:
590 rq->cmd_len = 10;
591 rq->cmd[0] = WRITE_SAME;
592 if (sdkp->provisioning_mode == SD_LBP_WS10)
593 rq->cmd[1] = 0x8; /* UNMAP */
594 put_unaligned_be32(sector, &rq->cmd[2]);
595 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
596
597 len = sdkp->device->sector_size;
598 break;
599
600 default:
601 ret = BLKPREP_KILL;
602 goto out;
603 }
604
605 blk_add_request_payload(rq, page, len);
606 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
607 rq->buffer = page_address(page);
608
609 out:
610 if (ret != BLKPREP_OK) {
611 __free_page(page);
612 rq->buffer = NULL;
613 }
614 return ret;
615 }
616
617 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
618 {
619 rq->timeout = SD_FLUSH_TIMEOUT;
620 rq->retries = SD_MAX_RETRIES;
621 rq->cmd[0] = SYNCHRONIZE_CACHE;
622 rq->cmd_len = 10;
623
624 return scsi_setup_blk_pc_cmnd(sdp, rq);
625 }
626
627 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
628 {
629 if (rq->cmd_flags & REQ_DISCARD) {
630 free_page((unsigned long)rq->buffer);
631 rq->buffer = NULL;
632 }
633 }
634
635 /**
636 * sd_init_command - build a scsi (read or write) command from
637 * information in the request structure.
638 * @SCpnt: pointer to mid-level's per scsi command structure that
639 * contains request and into which the scsi command is written
640 *
641 * Returns 1 if successful and 0 if error (or cannot be done now).
642 **/
643 static int sd_prep_fn(struct request_queue *q, struct request *rq)
644 {
645 struct scsi_cmnd *SCpnt;
646 struct scsi_device *sdp = q->queuedata;
647 struct gendisk *disk = rq->rq_disk;
648 struct scsi_disk *sdkp;
649 sector_t block = blk_rq_pos(rq);
650 sector_t threshold;
651 unsigned int this_count = blk_rq_sectors(rq);
652 int ret, host_dif;
653 unsigned char protect;
654
655 /*
656 * Discard request come in as REQ_TYPE_FS but we turn them into
657 * block PC requests to make life easier.
658 */
659 if (rq->cmd_flags & REQ_DISCARD) {
660 ret = scsi_setup_discard_cmnd(sdp, rq);
661 goto out;
662 } else if (rq->cmd_flags & REQ_FLUSH) {
663 ret = scsi_setup_flush_cmnd(sdp, rq);
664 goto out;
665 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
666 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
667 goto out;
668 } else if (rq->cmd_type != REQ_TYPE_FS) {
669 ret = BLKPREP_KILL;
670 goto out;
671 }
672 ret = scsi_setup_fs_cmnd(sdp, rq);
673 if (ret != BLKPREP_OK)
674 goto out;
675 SCpnt = rq->special;
676 sdkp = scsi_disk(disk);
677
678 /* from here on until we're complete, any goto out
679 * is used for a killable error condition */
680 ret = BLKPREP_KILL;
681
682 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
683 "sd_init_command: block=%llu, "
684 "count=%d\n",
685 (unsigned long long)block,
686 this_count));
687
688 if (!sdp || !scsi_device_online(sdp) ||
689 block + blk_rq_sectors(rq) > get_capacity(disk)) {
690 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
691 "Finishing %u sectors\n",
692 blk_rq_sectors(rq)));
693 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
694 "Retry with 0x%p\n", SCpnt));
695 goto out;
696 }
697
698 if (sdp->changed) {
699 /*
700 * quietly refuse to do anything to a changed disc until
701 * the changed bit has been reset
702 */
703 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
704 goto out;
705 }
706
707 /*
708 * Some SD card readers can't handle multi-sector accesses which touch
709 * the last one or two hardware sectors. Split accesses as needed.
710 */
711 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
712 (sdp->sector_size / 512);
713
714 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
715 if (block < threshold) {
716 /* Access up to the threshold but not beyond */
717 this_count = threshold - block;
718 } else {
719 /* Access only a single hardware sector */
720 this_count = sdp->sector_size / 512;
721 }
722 }
723
724 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
725 (unsigned long long)block));
726
727 /*
728 * If we have a 1K hardware sectorsize, prevent access to single
729 * 512 byte sectors. In theory we could handle this - in fact
730 * the scsi cdrom driver must be able to handle this because
731 * we typically use 1K blocksizes, and cdroms typically have
732 * 2K hardware sectorsizes. Of course, things are simpler
733 * with the cdrom, since it is read-only. For performance
734 * reasons, the filesystems should be able to handle this
735 * and not force the scsi disk driver to use bounce buffers
736 * for this.
737 */
738 if (sdp->sector_size == 1024) {
739 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
740 scmd_printk(KERN_ERR, SCpnt,
741 "Bad block number requested\n");
742 goto out;
743 } else {
744 block = block >> 1;
745 this_count = this_count >> 1;
746 }
747 }
748 if (sdp->sector_size == 2048) {
749 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
750 scmd_printk(KERN_ERR, SCpnt,
751 "Bad block number requested\n");
752 goto out;
753 } else {
754 block = block >> 2;
755 this_count = this_count >> 2;
756 }
757 }
758 if (sdp->sector_size == 4096) {
759 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
760 scmd_printk(KERN_ERR, SCpnt,
761 "Bad block number requested\n");
762 goto out;
763 } else {
764 block = block >> 3;
765 this_count = this_count >> 3;
766 }
767 }
768 if (rq_data_dir(rq) == WRITE) {
769 if (!sdp->writeable) {
770 goto out;
771 }
772 SCpnt->cmnd[0] = WRITE_6;
773 SCpnt->sc_data_direction = DMA_TO_DEVICE;
774
775 if (blk_integrity_rq(rq) &&
776 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
777 goto out;
778
779 } else if (rq_data_dir(rq) == READ) {
780 SCpnt->cmnd[0] = READ_6;
781 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
782 } else {
783 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
784 goto out;
785 }
786
787 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
788 "%s %d/%u 512 byte blocks.\n",
789 (rq_data_dir(rq) == WRITE) ?
790 "writing" : "reading", this_count,
791 blk_rq_sectors(rq)));
792
793 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
794 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
795 if (host_dif)
796 protect = 1 << 5;
797 else
798 protect = 0;
799
800 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
801 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
802
803 if (unlikely(SCpnt->cmnd == NULL)) {
804 ret = BLKPREP_DEFER;
805 goto out;
806 }
807
808 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
809 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
810 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
811 SCpnt->cmnd[7] = 0x18;
812 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
813 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
814
815 /* LBA */
816 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
817 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
818 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
819 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
820 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
821 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
822 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
823 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
824
825 /* Expected Indirect LBA */
826 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
827 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
828 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
829 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
830
831 /* Transfer length */
832 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
833 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
834 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
835 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
836 } else if (block > 0xffffffff) {
837 SCpnt->cmnd[0] += READ_16 - READ_6;
838 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
839 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
840 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
841 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
842 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
843 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
844 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
845 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
846 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
847 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
848 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
849 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
850 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
851 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
852 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
853 scsi_device_protection(SCpnt->device) ||
854 SCpnt->device->use_10_for_rw) {
855 if (this_count > 0xffff)
856 this_count = 0xffff;
857
858 SCpnt->cmnd[0] += READ_10 - READ_6;
859 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
860 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
861 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
862 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
863 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
864 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
865 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
866 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
867 } else {
868 if (unlikely(rq->cmd_flags & REQ_FUA)) {
869 /*
870 * This happens only if this drive failed
871 * 10byte rw command with ILLEGAL_REQUEST
872 * during operation and thus turned off
873 * use_10_for_rw.
874 */
875 scmd_printk(KERN_ERR, SCpnt,
876 "FUA write on READ/WRITE(6) drive\n");
877 goto out;
878 }
879
880 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
881 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
882 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
883 SCpnt->cmnd[4] = (unsigned char) this_count;
884 SCpnt->cmnd[5] = 0;
885 }
886 SCpnt->sdb.length = this_count * sdp->sector_size;
887
888 /* If DIF or DIX is enabled, tell HBA how to handle request */
889 if (host_dif || scsi_prot_sg_count(SCpnt))
890 sd_prot_op(SCpnt, host_dif);
891
892 /*
893 * We shouldn't disconnect in the middle of a sector, so with a dumb
894 * host adapter, it's safe to assume that we can at least transfer
895 * this many bytes between each connect / disconnect.
896 */
897 SCpnt->transfersize = sdp->sector_size;
898 SCpnt->underflow = this_count << 9;
899 SCpnt->allowed = SD_MAX_RETRIES;
900
901 /*
902 * This indicates that the command is ready from our end to be
903 * queued.
904 */
905 ret = BLKPREP_OK;
906 out:
907 return scsi_prep_return(q, rq, ret);
908 }
909
910 /**
911 * sd_open - open a scsi disk device
912 * @inode: only i_rdev member may be used
913 * @filp: only f_mode and f_flags may be used
914 *
915 * Returns 0 if successful. Returns a negated errno value in case
916 * of error.
917 *
918 * Note: This can be called from a user context (e.g. fsck(1) )
919 * or from within the kernel (e.g. as a result of a mount(1) ).
920 * In the latter case @inode and @filp carry an abridged amount
921 * of information as noted above.
922 *
923 * Locking: called with bdev->bd_mutex held.
924 **/
925 static int sd_open(struct block_device *bdev, fmode_t mode)
926 {
927 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
928 struct scsi_device *sdev;
929 int retval;
930
931 if (!sdkp)
932 return -ENXIO;
933
934 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
935
936 sdev = sdkp->device;
937
938 retval = scsi_autopm_get_device(sdev);
939 if (retval)
940 goto error_autopm;
941
942 /*
943 * If the device is in error recovery, wait until it is done.
944 * If the device is offline, then disallow any access to it.
945 */
946 retval = -ENXIO;
947 if (!scsi_block_when_processing_errors(sdev))
948 goto error_out;
949
950 if (sdev->removable || sdkp->write_prot)
951 check_disk_change(bdev);
952
953 /*
954 * If the drive is empty, just let the open fail.
955 */
956 retval = -ENOMEDIUM;
957 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
958 goto error_out;
959
960 /*
961 * If the device has the write protect tab set, have the open fail
962 * if the user expects to be able to write to the thing.
963 */
964 retval = -EROFS;
965 if (sdkp->write_prot && (mode & FMODE_WRITE))
966 goto error_out;
967
968 /*
969 * It is possible that the disk changing stuff resulted in
970 * the device being taken offline. If this is the case,
971 * report this to the user, and don't pretend that the
972 * open actually succeeded.
973 */
974 retval = -ENXIO;
975 if (!scsi_device_online(sdev))
976 goto error_out;
977
978 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
979 if (scsi_block_when_processing_errors(sdev))
980 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
981 }
982
983 return 0;
984
985 error_out:
986 scsi_autopm_put_device(sdev);
987 error_autopm:
988 scsi_disk_put(sdkp);
989 return retval;
990 }
991
992 /**
993 * sd_release - invoked when the (last) close(2) is called on this
994 * scsi disk.
995 * @inode: only i_rdev member may be used
996 * @filp: only f_mode and f_flags may be used
997 *
998 * Returns 0.
999 *
1000 * Note: may block (uninterruptible) if error recovery is underway
1001 * on this disk.
1002 *
1003 * Locking: called with bdev->bd_mutex held.
1004 **/
1005 static int sd_release(struct gendisk *disk, fmode_t mode)
1006 {
1007 struct scsi_disk *sdkp = scsi_disk(disk);
1008 struct scsi_device *sdev = sdkp->device;
1009
1010 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1011
1012 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1013 if (scsi_block_when_processing_errors(sdev))
1014 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1015 }
1016
1017 /*
1018 * XXX and what if there are packets in flight and this close()
1019 * XXX is followed by a "rmmod sd_mod"?
1020 */
1021
1022 scsi_autopm_put_device(sdev);
1023 scsi_disk_put(sdkp);
1024 return 0;
1025 }
1026
1027 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1028 {
1029 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1030 struct scsi_device *sdp = sdkp->device;
1031 struct Scsi_Host *host = sdp->host;
1032 int diskinfo[4];
1033
1034 /* default to most commonly used values */
1035 diskinfo[0] = 0x40; /* 1 << 6 */
1036 diskinfo[1] = 0x20; /* 1 << 5 */
1037 diskinfo[2] = sdkp->capacity >> 11;
1038
1039 /* override with calculated, extended default, or driver values */
1040 if (host->hostt->bios_param)
1041 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1042 else
1043 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1044
1045 geo->heads = diskinfo[0];
1046 geo->sectors = diskinfo[1];
1047 geo->cylinders = diskinfo[2];
1048 return 0;
1049 }
1050
1051 /**
1052 * sd_ioctl - process an ioctl
1053 * @inode: only i_rdev/i_bdev members may be used
1054 * @filp: only f_mode and f_flags may be used
1055 * @cmd: ioctl command number
1056 * @arg: this is third argument given to ioctl(2) system call.
1057 * Often contains a pointer.
1058 *
1059 * Returns 0 if successful (some ioctls return positive numbers on
1060 * success as well). Returns a negated errno value in case of error.
1061 *
1062 * Note: most ioctls are forward onto the block subsystem or further
1063 * down in the scsi subsystem.
1064 **/
1065 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1066 unsigned int cmd, unsigned long arg)
1067 {
1068 struct gendisk *disk = bdev->bd_disk;
1069 struct scsi_disk *sdkp = scsi_disk(disk);
1070 struct scsi_device *sdp = sdkp->device;
1071 void __user *p = (void __user *)arg;
1072 int error;
1073
1074 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1075 "cmd=0x%x\n", disk->disk_name, cmd));
1076
1077 error = scsi_verify_blk_ioctl(bdev, cmd);
1078 if (error < 0)
1079 return error;
1080
1081 /*
1082 * If we are in the middle of error recovery, don't let anyone
1083 * else try and use this device. Also, if error recovery fails, it
1084 * may try and take the device offline, in which case all further
1085 * access to the device is prohibited.
1086 */
1087 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1088 (mode & FMODE_NDELAY) != 0);
1089 if (!scsi_block_when_processing_errors(sdp) || !error)
1090 goto out;
1091
1092 /*
1093 * Send SCSI addressing ioctls directly to mid level, send other
1094 * ioctls to block level and then onto mid level if they can't be
1095 * resolved.
1096 */
1097 switch (cmd) {
1098 case SCSI_IOCTL_GET_IDLUN:
1099 case SCSI_IOCTL_GET_BUS_NUMBER:
1100 error = scsi_ioctl(sdp, cmd, p);
1101 break;
1102 default:
1103 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1104 if (error != -ENOTTY)
1105 break;
1106 error = scsi_ioctl(sdp, cmd, p);
1107 break;
1108 }
1109 out:
1110 return error;
1111 }
1112
1113 static void set_media_not_present(struct scsi_disk *sdkp)
1114 {
1115 if (sdkp->media_present)
1116 sdkp->device->changed = 1;
1117
1118 if (sdkp->device->removable) {
1119 sdkp->media_present = 0;
1120 sdkp->capacity = 0;
1121 }
1122 }
1123
1124 static int media_not_present(struct scsi_disk *sdkp,
1125 struct scsi_sense_hdr *sshdr)
1126 {
1127 if (!scsi_sense_valid(sshdr))
1128 return 0;
1129
1130 /* not invoked for commands that could return deferred errors */
1131 switch (sshdr->sense_key) {
1132 case UNIT_ATTENTION:
1133 case NOT_READY:
1134 /* medium not present */
1135 if (sshdr->asc == 0x3A) {
1136 set_media_not_present(sdkp);
1137 return 1;
1138 }
1139 }
1140 return 0;
1141 }
1142
1143 /**
1144 * sd_check_events - check media events
1145 * @disk: kernel device descriptor
1146 * @clearing: disk events currently being cleared
1147 *
1148 * Returns mask of DISK_EVENT_*.
1149 *
1150 * Note: this function is invoked from the block subsystem.
1151 **/
1152 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1153 {
1154 struct scsi_disk *sdkp = scsi_disk(disk);
1155 struct scsi_device *sdp = sdkp->device;
1156 struct scsi_sense_hdr *sshdr = NULL;
1157 int retval;
1158
1159 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1160
1161 /*
1162 * If the device is offline, don't send any commands - just pretend as
1163 * if the command failed. If the device ever comes back online, we
1164 * can deal with it then. It is only because of unrecoverable errors
1165 * that we would ever take a device offline in the first place.
1166 */
1167 if (!scsi_device_online(sdp)) {
1168 set_media_not_present(sdkp);
1169 goto out;
1170 }
1171
1172 /*
1173 * Using TEST_UNIT_READY enables differentiation between drive with
1174 * no cartridge loaded - NOT READY, drive with changed cartridge -
1175 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1176 *
1177 * Drives that auto spin down. eg iomega jaz 1G, will be started
1178 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1179 * sd_revalidate() is called.
1180 */
1181 retval = -ENODEV;
1182
1183 if (scsi_block_when_processing_errors(sdp)) {
1184 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1185 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1186 sshdr);
1187 }
1188
1189 /* failed to execute TUR, assume media not present */
1190 if (host_byte(retval)) {
1191 set_media_not_present(sdkp);
1192 goto out;
1193 }
1194
1195 if (media_not_present(sdkp, sshdr))
1196 goto out;
1197
1198 /*
1199 * For removable scsi disk we have to recognise the presence
1200 * of a disk in the drive.
1201 */
1202 if (!sdkp->media_present)
1203 sdp->changed = 1;
1204 sdkp->media_present = 1;
1205 out:
1206 /*
1207 * sdp->changed is set under the following conditions:
1208 *
1209 * Medium present state has changed in either direction.
1210 * Device has indicated UNIT_ATTENTION.
1211 */
1212 kfree(sshdr);
1213 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1214 sdp->changed = 0;
1215 return retval;
1216 }
1217
1218 static int sd_sync_cache(struct scsi_disk *sdkp)
1219 {
1220 int retries, res;
1221 struct scsi_device *sdp = sdkp->device;
1222 struct scsi_sense_hdr sshdr;
1223
1224 if (!scsi_device_online(sdp))
1225 return -ENODEV;
1226
1227
1228 for (retries = 3; retries > 0; --retries) {
1229 unsigned char cmd[10] = { 0 };
1230
1231 cmd[0] = SYNCHRONIZE_CACHE;
1232 /*
1233 * Leave the rest of the command zero to indicate
1234 * flush everything.
1235 */
1236 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1237 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1238 if (res == 0)
1239 break;
1240 }
1241
1242 if (res) {
1243 sd_print_result(sdkp, res);
1244 if (driver_byte(res) & DRIVER_SENSE)
1245 sd_print_sense_hdr(sdkp, &sshdr);
1246 }
1247
1248 if (res)
1249 return -EIO;
1250 return 0;
1251 }
1252
1253 static void sd_rescan(struct device *dev)
1254 {
1255 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1256
1257 if (sdkp) {
1258 revalidate_disk(sdkp->disk);
1259 scsi_disk_put(sdkp);
1260 }
1261 }
1262
1263
1264 #ifdef CONFIG_COMPAT
1265 /*
1266 * This gets directly called from VFS. When the ioctl
1267 * is not recognized we go back to the other translation paths.
1268 */
1269 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1270 unsigned int cmd, unsigned long arg)
1271 {
1272 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1273 int ret;
1274
1275 ret = scsi_verify_blk_ioctl(bdev, cmd);
1276 if (ret < 0)
1277 return -ENOIOCTLCMD;
1278
1279 /*
1280 * If we are in the middle of error recovery, don't let anyone
1281 * else try and use this device. Also, if error recovery fails, it
1282 * may try and take the device offline, in which case all further
1283 * access to the device is prohibited.
1284 */
1285 if (!scsi_block_when_processing_errors(sdev))
1286 return -ENODEV;
1287
1288 if (sdev->host->hostt->compat_ioctl) {
1289 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1290
1291 return ret;
1292 }
1293
1294 /*
1295 * Let the static ioctl translation table take care of it.
1296 */
1297 return -ENOIOCTLCMD;
1298 }
1299 #endif
1300
1301 static const struct block_device_operations sd_fops = {
1302 .owner = THIS_MODULE,
1303 .open = sd_open,
1304 .release = sd_release,
1305 .ioctl = sd_ioctl,
1306 .getgeo = sd_getgeo,
1307 #ifdef CONFIG_COMPAT
1308 .compat_ioctl = sd_compat_ioctl,
1309 #endif
1310 .check_events = sd_check_events,
1311 .revalidate_disk = sd_revalidate_disk,
1312 .unlock_native_capacity = sd_unlock_native_capacity,
1313 };
1314
1315 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1316 {
1317 u64 start_lba = blk_rq_pos(scmd->request);
1318 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1319 u64 bad_lba;
1320 int info_valid;
1321 /*
1322 * resid is optional but mostly filled in. When it's unused,
1323 * its value is zero, so we assume the whole buffer transferred
1324 */
1325 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1326 unsigned int good_bytes;
1327
1328 if (scmd->request->cmd_type != REQ_TYPE_FS)
1329 return 0;
1330
1331 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1332 SCSI_SENSE_BUFFERSIZE,
1333 &bad_lba);
1334 if (!info_valid)
1335 return 0;
1336
1337 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1338 return 0;
1339
1340 if (scmd->device->sector_size < 512) {
1341 /* only legitimate sector_size here is 256 */
1342 start_lba <<= 1;
1343 end_lba <<= 1;
1344 } else {
1345 /* be careful ... don't want any overflows */
1346 u64 factor = scmd->device->sector_size / 512;
1347 do_div(start_lba, factor);
1348 do_div(end_lba, factor);
1349 }
1350
1351 /* The bad lba was reported incorrectly, we have no idea where
1352 * the error is.
1353 */
1354 if (bad_lba < start_lba || bad_lba >= end_lba)
1355 return 0;
1356
1357 /* This computation should always be done in terms of
1358 * the resolution of the device's medium.
1359 */
1360 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1361 return min(good_bytes, transferred);
1362 }
1363
1364 /**
1365 * sd_done - bottom half handler: called when the lower level
1366 * driver has completed (successfully or otherwise) a scsi command.
1367 * @SCpnt: mid-level's per command structure.
1368 *
1369 * Note: potentially run from within an ISR. Must not block.
1370 **/
1371 static int sd_done(struct scsi_cmnd *SCpnt)
1372 {
1373 int result = SCpnt->result;
1374 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1375 struct scsi_sense_hdr sshdr;
1376 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1377 int sense_valid = 0;
1378 int sense_deferred = 0;
1379 unsigned char op = SCpnt->cmnd[0];
1380
1381 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1382 scsi_set_resid(SCpnt, 0);
1383
1384 if (result) {
1385 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1386 if (sense_valid)
1387 sense_deferred = scsi_sense_is_deferred(&sshdr);
1388 }
1389 #ifdef CONFIG_SCSI_LOGGING
1390 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1391 if (sense_valid) {
1392 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1393 "sd_done: sb[respc,sk,asc,"
1394 "ascq]=%x,%x,%x,%x\n",
1395 sshdr.response_code,
1396 sshdr.sense_key, sshdr.asc,
1397 sshdr.ascq));
1398 }
1399 #endif
1400 if (driver_byte(result) != DRIVER_SENSE &&
1401 (!sense_valid || sense_deferred))
1402 goto out;
1403
1404 switch (sshdr.sense_key) {
1405 case HARDWARE_ERROR:
1406 case MEDIUM_ERROR:
1407 good_bytes = sd_completed_bytes(SCpnt);
1408 break;
1409 case RECOVERED_ERROR:
1410 good_bytes = scsi_bufflen(SCpnt);
1411 break;
1412 case NO_SENSE:
1413 /* This indicates a false check condition, so ignore it. An
1414 * unknown amount of data was transferred so treat it as an
1415 * error.
1416 */
1417 scsi_print_sense("sd", SCpnt);
1418 SCpnt->result = 0;
1419 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1420 break;
1421 case ABORTED_COMMAND:
1422 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1423 good_bytes = sd_completed_bytes(SCpnt);
1424 break;
1425 case ILLEGAL_REQUEST:
1426 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1427 good_bytes = sd_completed_bytes(SCpnt);
1428 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1429 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1430 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1431 sd_config_discard(sdkp, SD_LBP_DISABLE);
1432 break;
1433 default:
1434 break;
1435 }
1436 out:
1437 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1438 sd_dif_complete(SCpnt, good_bytes);
1439
1440 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1441 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1442
1443 /* We have to print a failed command here as the
1444 * extended CDB gets freed before scsi_io_completion()
1445 * is called.
1446 */
1447 if (result)
1448 scsi_print_command(SCpnt);
1449
1450 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1451 SCpnt->cmnd = NULL;
1452 SCpnt->cmd_len = 0;
1453 }
1454
1455 return good_bytes;
1456 }
1457
1458 /*
1459 * spinup disk - called only in sd_revalidate_disk()
1460 */
1461 static void
1462 sd_spinup_disk(struct scsi_disk *sdkp)
1463 {
1464 unsigned char cmd[10];
1465 unsigned long spintime_expire = 0;
1466 int retries, spintime;
1467 unsigned int the_result;
1468 struct scsi_sense_hdr sshdr;
1469 int sense_valid = 0;
1470
1471 spintime = 0;
1472
1473 /* Spin up drives, as required. Only do this at boot time */
1474 /* Spinup needs to be done for module loads too. */
1475 do {
1476 retries = 0;
1477
1478 do {
1479 cmd[0] = TEST_UNIT_READY;
1480 memset((void *) &cmd[1], 0, 9);
1481
1482 the_result = scsi_execute_req(sdkp->device, cmd,
1483 DMA_NONE, NULL, 0,
1484 &sshdr, SD_TIMEOUT,
1485 SD_MAX_RETRIES, NULL);
1486
1487 /*
1488 * If the drive has indicated to us that it
1489 * doesn't have any media in it, don't bother
1490 * with any more polling.
1491 */
1492 if (media_not_present(sdkp, &sshdr))
1493 return;
1494
1495 if (the_result)
1496 sense_valid = scsi_sense_valid(&sshdr);
1497 retries++;
1498 } while (retries < 3 &&
1499 (!scsi_status_is_good(the_result) ||
1500 ((driver_byte(the_result) & DRIVER_SENSE) &&
1501 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1502
1503 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1504 /* no sense, TUR either succeeded or failed
1505 * with a status error */
1506 if(!spintime && !scsi_status_is_good(the_result)) {
1507 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1508 sd_print_result(sdkp, the_result);
1509 }
1510 break;
1511 }
1512
1513 /*
1514 * The device does not want the automatic start to be issued.
1515 */
1516 if (sdkp->device->no_start_on_add)
1517 break;
1518
1519 if (sense_valid && sshdr.sense_key == NOT_READY) {
1520 if (sshdr.asc == 4 && sshdr.ascq == 3)
1521 break; /* manual intervention required */
1522 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1523 break; /* standby */
1524 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1525 break; /* unavailable */
1526 /*
1527 * Issue command to spin up drive when not ready
1528 */
1529 if (!spintime) {
1530 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1531 cmd[0] = START_STOP;
1532 cmd[1] = 1; /* Return immediately */
1533 memset((void *) &cmd[2], 0, 8);
1534 cmd[4] = 1; /* Start spin cycle */
1535 if (sdkp->device->start_stop_pwr_cond)
1536 cmd[4] |= 1 << 4;
1537 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1538 NULL, 0, &sshdr,
1539 SD_TIMEOUT, SD_MAX_RETRIES,
1540 NULL);
1541 spintime_expire = jiffies + 100 * HZ;
1542 spintime = 1;
1543 }
1544 /* Wait 1 second for next try */
1545 msleep(1000);
1546 printk(".");
1547
1548 /*
1549 * Wait for USB flash devices with slow firmware.
1550 * Yes, this sense key/ASC combination shouldn't
1551 * occur here. It's characteristic of these devices.
1552 */
1553 } else if (sense_valid &&
1554 sshdr.sense_key == UNIT_ATTENTION &&
1555 sshdr.asc == 0x28) {
1556 if (!spintime) {
1557 spintime_expire = jiffies + 5 * HZ;
1558 spintime = 1;
1559 }
1560 /* Wait 1 second for next try */
1561 msleep(1000);
1562 } else {
1563 /* we don't understand the sense code, so it's
1564 * probably pointless to loop */
1565 if(!spintime) {
1566 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1567 sd_print_sense_hdr(sdkp, &sshdr);
1568 }
1569 break;
1570 }
1571
1572 } while (spintime && time_before_eq(jiffies, spintime_expire));
1573
1574 if (spintime) {
1575 if (scsi_status_is_good(the_result))
1576 printk("ready\n");
1577 else
1578 printk("not responding...\n");
1579 }
1580 }
1581
1582
1583 /*
1584 * Determine whether disk supports Data Integrity Field.
1585 */
1586 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1587 {
1588 struct scsi_device *sdp = sdkp->device;
1589 u8 type;
1590
1591 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1592 return;
1593
1594 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1595
1596 if (type == sdkp->protection_type || !sdkp->first_scan)
1597 return;
1598
1599 sdkp->protection_type = type;
1600
1601 if (type > SD_DIF_TYPE3_PROTECTION) {
1602 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1603 "protection type %u. Disabling disk!\n", type);
1604 sdkp->capacity = 0;
1605 return;
1606 }
1607
1608 if (scsi_host_dif_capable(sdp->host, type))
1609 sd_printk(KERN_NOTICE, sdkp,
1610 "Enabling DIF Type %u protection\n", type);
1611 else
1612 sd_printk(KERN_NOTICE, sdkp,
1613 "Disabling DIF Type %u protection\n", type);
1614 }
1615
1616 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1617 struct scsi_sense_hdr *sshdr, int sense_valid,
1618 int the_result)
1619 {
1620 sd_print_result(sdkp, the_result);
1621 if (driver_byte(the_result) & DRIVER_SENSE)
1622 sd_print_sense_hdr(sdkp, sshdr);
1623 else
1624 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1625
1626 /*
1627 * Set dirty bit for removable devices if not ready -
1628 * sometimes drives will not report this properly.
1629 */
1630 if (sdp->removable &&
1631 sense_valid && sshdr->sense_key == NOT_READY)
1632 set_media_not_present(sdkp);
1633
1634 /*
1635 * We used to set media_present to 0 here to indicate no media
1636 * in the drive, but some drives fail read capacity even with
1637 * media present, so we can't do that.
1638 */
1639 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1640 }
1641
1642 #define RC16_LEN 32
1643 #if RC16_LEN > SD_BUF_SIZE
1644 #error RC16_LEN must not be more than SD_BUF_SIZE
1645 #endif
1646
1647 #define READ_CAPACITY_RETRIES_ON_RESET 10
1648
1649 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1650 unsigned char *buffer)
1651 {
1652 unsigned char cmd[16];
1653 struct scsi_sense_hdr sshdr;
1654 int sense_valid = 0;
1655 int the_result;
1656 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1657 unsigned int alignment;
1658 unsigned long long lba;
1659 unsigned sector_size;
1660
1661 if (sdp->no_read_capacity_16)
1662 return -EINVAL;
1663
1664 do {
1665 memset(cmd, 0, 16);
1666 cmd[0] = SERVICE_ACTION_IN;
1667 cmd[1] = SAI_READ_CAPACITY_16;
1668 cmd[13] = RC16_LEN;
1669 memset(buffer, 0, RC16_LEN);
1670
1671 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1672 buffer, RC16_LEN, &sshdr,
1673 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1674
1675 if (media_not_present(sdkp, &sshdr))
1676 return -ENODEV;
1677
1678 if (the_result) {
1679 sense_valid = scsi_sense_valid(&sshdr);
1680 if (sense_valid &&
1681 sshdr.sense_key == ILLEGAL_REQUEST &&
1682 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1683 sshdr.ascq == 0x00)
1684 /* Invalid Command Operation Code or
1685 * Invalid Field in CDB, just retry
1686 * silently with RC10 */
1687 return -EINVAL;
1688 if (sense_valid &&
1689 sshdr.sense_key == UNIT_ATTENTION &&
1690 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1691 /* Device reset might occur several times,
1692 * give it one more chance */
1693 if (--reset_retries > 0)
1694 continue;
1695 }
1696 retries--;
1697
1698 } while (the_result && retries);
1699
1700 if (the_result) {
1701 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1702 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1703 return -EINVAL;
1704 }
1705
1706 sector_size = get_unaligned_be32(&buffer[8]);
1707 lba = get_unaligned_be64(&buffer[0]);
1708
1709 sd_read_protection_type(sdkp, buffer);
1710
1711 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1712 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1713 "kernel compiled with support for large block "
1714 "devices.\n");
1715 sdkp->capacity = 0;
1716 return -EOVERFLOW;
1717 }
1718
1719 /* Logical blocks per physical block exponent */
1720 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1721
1722 /* Lowest aligned logical block */
1723 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1724 blk_queue_alignment_offset(sdp->request_queue, alignment);
1725 if (alignment && sdkp->first_scan)
1726 sd_printk(KERN_NOTICE, sdkp,
1727 "physical block alignment offset: %u\n", alignment);
1728
1729 if (buffer[14] & 0x80) { /* LBPME */
1730 sdkp->lbpme = 1;
1731
1732 if (buffer[14] & 0x40) /* LBPRZ */
1733 sdkp->lbprz = 1;
1734
1735 sd_config_discard(sdkp, SD_LBP_WS16);
1736 }
1737
1738 sdkp->capacity = lba + 1;
1739 return sector_size;
1740 }
1741
1742 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1743 unsigned char *buffer)
1744 {
1745 unsigned char cmd[16];
1746 struct scsi_sense_hdr sshdr;
1747 int sense_valid = 0;
1748 int the_result;
1749 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1750 sector_t lba;
1751 unsigned sector_size;
1752
1753 do {
1754 cmd[0] = READ_CAPACITY;
1755 memset(&cmd[1], 0, 9);
1756 memset(buffer, 0, 8);
1757
1758 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1759 buffer, 8, &sshdr,
1760 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1761
1762 if (media_not_present(sdkp, &sshdr))
1763 return -ENODEV;
1764
1765 if (the_result) {
1766 sense_valid = scsi_sense_valid(&sshdr);
1767 if (sense_valid &&
1768 sshdr.sense_key == UNIT_ATTENTION &&
1769 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1770 /* Device reset might occur several times,
1771 * give it one more chance */
1772 if (--reset_retries > 0)
1773 continue;
1774 }
1775 retries--;
1776
1777 } while (the_result && retries);
1778
1779 if (the_result) {
1780 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1781 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1782 return -EINVAL;
1783 }
1784
1785 sector_size = get_unaligned_be32(&buffer[4]);
1786 lba = get_unaligned_be32(&buffer[0]);
1787
1788 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1789 /* Some buggy (usb cardreader) devices return an lba of
1790 0xffffffff when the want to report a size of 0 (with
1791 which they really mean no media is present) */
1792 sdkp->capacity = 0;
1793 sdkp->physical_block_size = sector_size;
1794 return sector_size;
1795 }
1796
1797 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1798 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1799 "kernel compiled with support for large block "
1800 "devices.\n");
1801 sdkp->capacity = 0;
1802 return -EOVERFLOW;
1803 }
1804
1805 sdkp->capacity = lba + 1;
1806 sdkp->physical_block_size = sector_size;
1807 return sector_size;
1808 }
1809
1810 static int sd_try_rc16_first(struct scsi_device *sdp)
1811 {
1812 if (sdp->host->max_cmd_len < 16)
1813 return 0;
1814 if (sdp->scsi_level > SCSI_SPC_2)
1815 return 1;
1816 if (scsi_device_protection(sdp))
1817 return 1;
1818 return 0;
1819 }
1820
1821 /*
1822 * read disk capacity
1823 */
1824 static void
1825 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1826 {
1827 int sector_size;
1828 struct scsi_device *sdp = sdkp->device;
1829 sector_t old_capacity = sdkp->capacity;
1830
1831 if (sd_try_rc16_first(sdp)) {
1832 sector_size = read_capacity_16(sdkp, sdp, buffer);
1833 if (sector_size == -EOVERFLOW)
1834 goto got_data;
1835 if (sector_size == -ENODEV)
1836 return;
1837 if (sector_size < 0)
1838 sector_size = read_capacity_10(sdkp, sdp, buffer);
1839 if (sector_size < 0)
1840 return;
1841 } else {
1842 sector_size = read_capacity_10(sdkp, sdp, buffer);
1843 if (sector_size == -EOVERFLOW)
1844 goto got_data;
1845 if (sector_size < 0)
1846 return;
1847 if ((sizeof(sdkp->capacity) > 4) &&
1848 (sdkp->capacity > 0xffffffffULL)) {
1849 int old_sector_size = sector_size;
1850 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1851 "Trying to use READ CAPACITY(16).\n");
1852 sector_size = read_capacity_16(sdkp, sdp, buffer);
1853 if (sector_size < 0) {
1854 sd_printk(KERN_NOTICE, sdkp,
1855 "Using 0xffffffff as device size\n");
1856 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1857 sector_size = old_sector_size;
1858 goto got_data;
1859 }
1860 }
1861 }
1862
1863 /* Some devices are known to return the total number of blocks,
1864 * not the highest block number. Some devices have versions
1865 * which do this and others which do not. Some devices we might
1866 * suspect of doing this but we don't know for certain.
1867 *
1868 * If we know the reported capacity is wrong, decrement it. If
1869 * we can only guess, then assume the number of blocks is even
1870 * (usually true but not always) and err on the side of lowering
1871 * the capacity.
1872 */
1873 if (sdp->fix_capacity ||
1874 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1875 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1876 "from its reported value: %llu\n",
1877 (unsigned long long) sdkp->capacity);
1878 --sdkp->capacity;
1879 }
1880
1881 got_data:
1882 if (sector_size == 0) {
1883 sector_size = 512;
1884 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1885 "assuming 512.\n");
1886 }
1887
1888 if (sector_size != 512 &&
1889 sector_size != 1024 &&
1890 sector_size != 2048 &&
1891 sector_size != 4096 &&
1892 sector_size != 256) {
1893 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1894 sector_size);
1895 /*
1896 * The user might want to re-format the drive with
1897 * a supported sectorsize. Once this happens, it
1898 * would be relatively trivial to set the thing up.
1899 * For this reason, we leave the thing in the table.
1900 */
1901 sdkp->capacity = 0;
1902 /*
1903 * set a bogus sector size so the normal read/write
1904 * logic in the block layer will eventually refuse any
1905 * request on this device without tripping over power
1906 * of two sector size assumptions
1907 */
1908 sector_size = 512;
1909 }
1910 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1911
1912 {
1913 char cap_str_2[10], cap_str_10[10];
1914 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1915
1916 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1917 sizeof(cap_str_2));
1918 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1919 sizeof(cap_str_10));
1920
1921 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1922 sd_printk(KERN_NOTICE, sdkp,
1923 "%llu %d-byte logical blocks: (%s/%s)\n",
1924 (unsigned long long)sdkp->capacity,
1925 sector_size, cap_str_10, cap_str_2);
1926
1927 if (sdkp->physical_block_size != sector_size)
1928 sd_printk(KERN_NOTICE, sdkp,
1929 "%u-byte physical blocks\n",
1930 sdkp->physical_block_size);
1931 }
1932 }
1933
1934 /* Rescale capacity to 512-byte units */
1935 if (sector_size == 4096)
1936 sdkp->capacity <<= 3;
1937 else if (sector_size == 2048)
1938 sdkp->capacity <<= 2;
1939 else if (sector_size == 1024)
1940 sdkp->capacity <<= 1;
1941 else if (sector_size == 256)
1942 sdkp->capacity >>= 1;
1943
1944 blk_queue_physical_block_size(sdp->request_queue,
1945 sdkp->physical_block_size);
1946 sdkp->device->sector_size = sector_size;
1947 }
1948
1949 /* called with buffer of length 512 */
1950 static inline int
1951 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1952 unsigned char *buffer, int len, struct scsi_mode_data *data,
1953 struct scsi_sense_hdr *sshdr)
1954 {
1955 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1956 SD_TIMEOUT, SD_MAX_RETRIES, data,
1957 sshdr);
1958 }
1959
1960 /*
1961 * read write protect setting, if possible - called only in sd_revalidate_disk()
1962 * called with buffer of length SD_BUF_SIZE
1963 */
1964 static void
1965 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1966 {
1967 int res;
1968 struct scsi_device *sdp = sdkp->device;
1969 struct scsi_mode_data data;
1970 int old_wp = sdkp->write_prot;
1971
1972 set_disk_ro(sdkp->disk, 0);
1973 if (sdp->skip_ms_page_3f) {
1974 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1975 return;
1976 }
1977
1978 if (sdp->use_192_bytes_for_3f) {
1979 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1980 } else {
1981 /*
1982 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1983 * We have to start carefully: some devices hang if we ask
1984 * for more than is available.
1985 */
1986 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1987
1988 /*
1989 * Second attempt: ask for page 0 When only page 0 is
1990 * implemented, a request for page 3F may return Sense Key
1991 * 5: Illegal Request, Sense Code 24: Invalid field in
1992 * CDB.
1993 */
1994 if (!scsi_status_is_good(res))
1995 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1996
1997 /*
1998 * Third attempt: ask 255 bytes, as we did earlier.
1999 */
2000 if (!scsi_status_is_good(res))
2001 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2002 &data, NULL);
2003 }
2004
2005 if (!scsi_status_is_good(res)) {
2006 sd_printk(KERN_WARNING, sdkp,
2007 "Test WP failed, assume Write Enabled\n");
2008 } else {
2009 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2010 set_disk_ro(sdkp->disk, sdkp->write_prot);
2011 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2012 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2013 sdkp->write_prot ? "on" : "off");
2014 sd_printk(KERN_DEBUG, sdkp,
2015 "Mode Sense: %02x %02x %02x %02x\n",
2016 buffer[0], buffer[1], buffer[2], buffer[3]);
2017 }
2018 }
2019 }
2020
2021 /*
2022 * sd_read_cache_type - called only from sd_revalidate_disk()
2023 * called with buffer of length SD_BUF_SIZE
2024 */
2025 static void
2026 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2027 {
2028 int len = 0, res;
2029 struct scsi_device *sdp = sdkp->device;
2030
2031 int dbd;
2032 int modepage;
2033 int first_len;
2034 struct scsi_mode_data data;
2035 struct scsi_sense_hdr sshdr;
2036 int old_wce = sdkp->WCE;
2037 int old_rcd = sdkp->RCD;
2038 int old_dpofua = sdkp->DPOFUA;
2039
2040 first_len = 4;
2041 if (sdp->skip_ms_page_8) {
2042 if (sdp->type == TYPE_RBC)
2043 goto defaults;
2044 else {
2045 if (sdp->skip_ms_page_3f)
2046 goto defaults;
2047 modepage = 0x3F;
2048 if (sdp->use_192_bytes_for_3f)
2049 first_len = 192;
2050 dbd = 0;
2051 }
2052 } else if (sdp->type == TYPE_RBC) {
2053 modepage = 6;
2054 dbd = 8;
2055 } else {
2056 modepage = 8;
2057 dbd = 0;
2058 }
2059
2060 /* cautiously ask */
2061 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2062 &data, &sshdr);
2063
2064 if (!scsi_status_is_good(res))
2065 goto bad_sense;
2066
2067 if (!data.header_length) {
2068 modepage = 6;
2069 first_len = 0;
2070 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2071 }
2072
2073 /* that went OK, now ask for the proper length */
2074 len = data.length;
2075
2076 /*
2077 * We're only interested in the first three bytes, actually.
2078 * But the data cache page is defined for the first 20.
2079 */
2080 if (len < 3)
2081 goto bad_sense;
2082 else if (len > SD_BUF_SIZE) {
2083 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2084 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2085 len = SD_BUF_SIZE;
2086 }
2087 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2088 len = 192;
2089
2090 /* Get the data */
2091 if (len > first_len)
2092 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2093 &data, &sshdr);
2094
2095 if (scsi_status_is_good(res)) {
2096 int offset = data.header_length + data.block_descriptor_length;
2097
2098 while (offset < len) {
2099 u8 page_code = buffer[offset] & 0x3F;
2100 u8 spf = buffer[offset] & 0x40;
2101
2102 if (page_code == 8 || page_code == 6) {
2103 /* We're interested only in the first 3 bytes.
2104 */
2105 if (len - offset <= 2) {
2106 sd_printk(KERN_ERR, sdkp, "Incomplete "
2107 "mode parameter data\n");
2108 goto defaults;
2109 } else {
2110 modepage = page_code;
2111 goto Page_found;
2112 }
2113 } else {
2114 /* Go to the next page */
2115 if (spf && len - offset > 3)
2116 offset += 4 + (buffer[offset+2] << 8) +
2117 buffer[offset+3];
2118 else if (!spf && len - offset > 1)
2119 offset += 2 + buffer[offset+1];
2120 else {
2121 sd_printk(KERN_ERR, sdkp, "Incomplete "
2122 "mode parameter data\n");
2123 goto defaults;
2124 }
2125 }
2126 }
2127
2128 if (modepage == 0x3F) {
2129 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2130 "present\n");
2131 goto defaults;
2132 } else if ((buffer[offset] & 0x3f) != modepage) {
2133 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2134 goto defaults;
2135 }
2136 Page_found:
2137 if (modepage == 8) {
2138 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2139 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2140 } else {
2141 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2142 sdkp->RCD = 0;
2143 }
2144
2145 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2146 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2147 sd_printk(KERN_NOTICE, sdkp,
2148 "Uses READ/WRITE(6), disabling FUA\n");
2149 sdkp->DPOFUA = 0;
2150 }
2151
2152 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2153 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2154 sd_printk(KERN_NOTICE, sdkp,
2155 "Write cache: %s, read cache: %s, %s\n",
2156 sdkp->WCE ? "enabled" : "disabled",
2157 sdkp->RCD ? "disabled" : "enabled",
2158 sdkp->DPOFUA ? "supports DPO and FUA"
2159 : "doesn't support DPO or FUA");
2160
2161 return;
2162 }
2163
2164 bad_sense:
2165 if (scsi_sense_valid(&sshdr) &&
2166 sshdr.sense_key == ILLEGAL_REQUEST &&
2167 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2168 /* Invalid field in CDB */
2169 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2170 else
2171 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2172
2173 defaults:
2174 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2175 sdkp->WCE = 0;
2176 sdkp->RCD = 0;
2177 sdkp->DPOFUA = 0;
2178 }
2179
2180 /*
2181 * The ATO bit indicates whether the DIF application tag is available
2182 * for use by the operating system.
2183 */
2184 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2185 {
2186 int res, offset;
2187 struct scsi_device *sdp = sdkp->device;
2188 struct scsi_mode_data data;
2189 struct scsi_sense_hdr sshdr;
2190
2191 if (sdp->type != TYPE_DISK)
2192 return;
2193
2194 if (sdkp->protection_type == 0)
2195 return;
2196
2197 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2198 SD_MAX_RETRIES, &data, &sshdr);
2199
2200 if (!scsi_status_is_good(res) || !data.header_length ||
2201 data.length < 6) {
2202 sd_printk(KERN_WARNING, sdkp,
2203 "getting Control mode page failed, assume no ATO\n");
2204
2205 if (scsi_sense_valid(&sshdr))
2206 sd_print_sense_hdr(sdkp, &sshdr);
2207
2208 return;
2209 }
2210
2211 offset = data.header_length + data.block_descriptor_length;
2212
2213 if ((buffer[offset] & 0x3f) != 0x0a) {
2214 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2215 return;
2216 }
2217
2218 if ((buffer[offset + 5] & 0x80) == 0)
2219 return;
2220
2221 sdkp->ATO = 1;
2222
2223 return;
2224 }
2225
2226 /**
2227 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2228 * @disk: disk to query
2229 */
2230 static void sd_read_block_limits(struct scsi_disk *sdkp)
2231 {
2232 unsigned int sector_sz = sdkp->device->sector_size;
2233 const int vpd_len = 64;
2234 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2235
2236 if (!buffer ||
2237 /* Block Limits VPD */
2238 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2239 goto out;
2240
2241 blk_queue_io_min(sdkp->disk->queue,
2242 get_unaligned_be16(&buffer[6]) * sector_sz);
2243 blk_queue_io_opt(sdkp->disk->queue,
2244 get_unaligned_be32(&buffer[12]) * sector_sz);
2245
2246 if (buffer[3] == 0x3c) {
2247 unsigned int lba_count, desc_count;
2248
2249 sdkp->max_ws_blocks =
2250 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2251 (u64)0xffffffff);
2252
2253 if (!sdkp->lbpme)
2254 goto out;
2255
2256 lba_count = get_unaligned_be32(&buffer[20]);
2257 desc_count = get_unaligned_be32(&buffer[24]);
2258
2259 if (lba_count && desc_count)
2260 sdkp->max_unmap_blocks = lba_count;
2261
2262 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2263
2264 if (buffer[32] & 0x80)
2265 sdkp->unmap_alignment =
2266 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2267
2268 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2269
2270 if (sdkp->max_unmap_blocks)
2271 sd_config_discard(sdkp, SD_LBP_UNMAP);
2272 else
2273 sd_config_discard(sdkp, SD_LBP_WS16);
2274
2275 } else { /* LBP VPD page tells us what to use */
2276
2277 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2278 sd_config_discard(sdkp, SD_LBP_UNMAP);
2279 else if (sdkp->lbpws)
2280 sd_config_discard(sdkp, SD_LBP_WS16);
2281 else if (sdkp->lbpws10)
2282 sd_config_discard(sdkp, SD_LBP_WS10);
2283 else
2284 sd_config_discard(sdkp, SD_LBP_DISABLE);
2285 }
2286 }
2287
2288 out:
2289 kfree(buffer);
2290 }
2291
2292 /**
2293 * sd_read_block_characteristics - Query block dev. characteristics
2294 * @disk: disk to query
2295 */
2296 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2297 {
2298 unsigned char *buffer;
2299 u16 rot;
2300 const int vpd_len = 64;
2301
2302 buffer = kmalloc(vpd_len, GFP_KERNEL);
2303
2304 if (!buffer ||
2305 /* Block Device Characteristics VPD */
2306 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2307 goto out;
2308
2309 rot = get_unaligned_be16(&buffer[4]);
2310
2311 if (rot == 1)
2312 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2313
2314 out:
2315 kfree(buffer);
2316 }
2317
2318 /**
2319 * sd_read_block_provisioning - Query provisioning VPD page
2320 * @disk: disk to query
2321 */
2322 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2323 {
2324 unsigned char *buffer;
2325 const int vpd_len = 8;
2326
2327 if (sdkp->lbpme == 0)
2328 return;
2329
2330 buffer = kmalloc(vpd_len, GFP_KERNEL);
2331
2332 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2333 goto out;
2334
2335 sdkp->lbpvpd = 1;
2336 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2337 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2338 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2339
2340 out:
2341 kfree(buffer);
2342 }
2343
2344 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2345 {
2346 /*
2347 * Although VPD inquiries can go to SCSI-2 type devices,
2348 * some USB ones crash on receiving them, and the pages
2349 * we currently ask for are for SPC-3 and beyond
2350 */
2351 if (sdp->scsi_level > SCSI_SPC_2)
2352 return 1;
2353 return 0;
2354 }
2355
2356 /**
2357 * sd_revalidate_disk - called the first time a new disk is seen,
2358 * performs disk spin up, read_capacity, etc.
2359 * @disk: struct gendisk we care about
2360 **/
2361 static int sd_revalidate_disk(struct gendisk *disk)
2362 {
2363 struct scsi_disk *sdkp = scsi_disk(disk);
2364 struct scsi_device *sdp = sdkp->device;
2365 unsigned char *buffer;
2366 unsigned flush = 0;
2367
2368 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2369 "sd_revalidate_disk\n"));
2370
2371 /*
2372 * If the device is offline, don't try and read capacity or any
2373 * of the other niceties.
2374 */
2375 if (!scsi_device_online(sdp))
2376 goto out;
2377
2378 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2379 if (!buffer) {
2380 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2381 "allocation failure.\n");
2382 goto out;
2383 }
2384
2385 sd_spinup_disk(sdkp);
2386
2387 /*
2388 * Without media there is no reason to ask; moreover, some devices
2389 * react badly if we do.
2390 */
2391 if (sdkp->media_present) {
2392 sd_read_capacity(sdkp, buffer);
2393
2394 if (sd_try_extended_inquiry(sdp)) {
2395 sd_read_block_provisioning(sdkp);
2396 sd_read_block_limits(sdkp);
2397 sd_read_block_characteristics(sdkp);
2398 }
2399
2400 sd_read_write_protect_flag(sdkp, buffer);
2401 sd_read_cache_type(sdkp, buffer);
2402 sd_read_app_tag_own(sdkp, buffer);
2403 }
2404
2405 sdkp->first_scan = 0;
2406
2407 /*
2408 * We now have all cache related info, determine how we deal
2409 * with flush requests.
2410 */
2411 if (sdkp->WCE) {
2412 flush |= REQ_FLUSH;
2413 if (sdkp->DPOFUA)
2414 flush |= REQ_FUA;
2415 }
2416
2417 blk_queue_flush(sdkp->disk->queue, flush);
2418
2419 set_capacity(disk, sdkp->capacity);
2420 kfree(buffer);
2421
2422 out:
2423 return 0;
2424 }
2425
2426 /**
2427 * sd_unlock_native_capacity - unlock native capacity
2428 * @disk: struct gendisk to set capacity for
2429 *
2430 * Block layer calls this function if it detects that partitions
2431 * on @disk reach beyond the end of the device. If the SCSI host
2432 * implements ->unlock_native_capacity() method, it's invoked to
2433 * give it a chance to adjust the device capacity.
2434 *
2435 * CONTEXT:
2436 * Defined by block layer. Might sleep.
2437 */
2438 static void sd_unlock_native_capacity(struct gendisk *disk)
2439 {
2440 struct scsi_device *sdev = scsi_disk(disk)->device;
2441
2442 if (sdev->host->hostt->unlock_native_capacity)
2443 sdev->host->hostt->unlock_native_capacity(sdev);
2444 }
2445
2446 /**
2447 * sd_format_disk_name - format disk name
2448 * @prefix: name prefix - ie. "sd" for SCSI disks
2449 * @index: index of the disk to format name for
2450 * @buf: output buffer
2451 * @buflen: length of the output buffer
2452 *
2453 * SCSI disk names starts at sda. The 26th device is sdz and the
2454 * 27th is sdaa. The last one for two lettered suffix is sdzz
2455 * which is followed by sdaaa.
2456 *
2457 * This is basically 26 base counting with one extra 'nil' entry
2458 * at the beginning from the second digit on and can be
2459 * determined using similar method as 26 base conversion with the
2460 * index shifted -1 after each digit is computed.
2461 *
2462 * CONTEXT:
2463 * Don't care.
2464 *
2465 * RETURNS:
2466 * 0 on success, -errno on failure.
2467 */
2468 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2469 {
2470 const int base = 'z' - 'a' + 1;
2471 char *begin = buf + strlen(prefix);
2472 char *end = buf + buflen;
2473 char *p;
2474 int unit;
2475
2476 p = end - 1;
2477 *p = '\0';
2478 unit = base;
2479 do {
2480 if (p == begin)
2481 return -EINVAL;
2482 *--p = 'a' + (index % unit);
2483 index = (index / unit) - 1;
2484 } while (index >= 0);
2485
2486 memmove(begin, p, end - p);
2487 memcpy(buf, prefix, strlen(prefix));
2488
2489 return 0;
2490 }
2491
2492 /*
2493 * The asynchronous part of sd_probe
2494 */
2495 static void sd_probe_async(void *data, async_cookie_t cookie)
2496 {
2497 struct scsi_disk *sdkp = data;
2498 struct scsi_device *sdp;
2499 struct gendisk *gd;
2500 u32 index;
2501 struct device *dev;
2502
2503 sdp = sdkp->device;
2504 gd = sdkp->disk;
2505 index = sdkp->index;
2506 dev = &sdp->sdev_gendev;
2507
2508 gd->major = sd_major((index & 0xf0) >> 4);
2509 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2510 gd->minors = SD_MINORS;
2511
2512 gd->fops = &sd_fops;
2513 gd->private_data = &sdkp->driver;
2514 gd->queue = sdkp->device->request_queue;
2515
2516 /* defaults, until the device tells us otherwise */
2517 sdp->sector_size = 512;
2518 sdkp->capacity = 0;
2519 sdkp->media_present = 1;
2520 sdkp->write_prot = 0;
2521 sdkp->WCE = 0;
2522 sdkp->RCD = 0;
2523 sdkp->ATO = 0;
2524 sdkp->first_scan = 1;
2525
2526 sd_revalidate_disk(gd);
2527
2528 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2529 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2530
2531 gd->driverfs_dev = &sdp->sdev_gendev;
2532 gd->flags = GENHD_FL_EXT_DEVT;
2533 if (sdp->removable) {
2534 gd->flags |= GENHD_FL_REMOVABLE;
2535 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2536 }
2537
2538 add_disk(gd);
2539 sd_dif_config_host(sdkp);
2540
2541 sd_revalidate_disk(gd);
2542
2543 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2544 sdp->removable ? "removable " : "");
2545 scsi_autopm_put_device(sdp);
2546 put_device(&sdkp->dev);
2547 }
2548
2549 /**
2550 * sd_probe - called during driver initialization and whenever a
2551 * new scsi device is attached to the system. It is called once
2552 * for each scsi device (not just disks) present.
2553 * @dev: pointer to device object
2554 *
2555 * Returns 0 if successful (or not interested in this scsi device
2556 * (e.g. scanner)); 1 when there is an error.
2557 *
2558 * Note: this function is invoked from the scsi mid-level.
2559 * This function sets up the mapping between a given
2560 * <host,channel,id,lun> (found in sdp) and new device name
2561 * (e.g. /dev/sda). More precisely it is the block device major
2562 * and minor number that is chosen here.
2563 *
2564 * Assume sd_attach is not re-entrant (for time being)
2565 * Also think about sd_attach() and sd_remove() running coincidentally.
2566 **/
2567 static int sd_probe(struct device *dev)
2568 {
2569 struct scsi_device *sdp = to_scsi_device(dev);
2570 struct scsi_disk *sdkp;
2571 struct gendisk *gd;
2572 int index;
2573 int error;
2574
2575 error = -ENODEV;
2576 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2577 goto out;
2578
2579 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2580 "sd_attach\n"));
2581
2582 error = -ENOMEM;
2583 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2584 if (!sdkp)
2585 goto out;
2586
2587 gd = alloc_disk(SD_MINORS);
2588 if (!gd)
2589 goto out_free;
2590
2591 do {
2592 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2593 goto out_put;
2594
2595 spin_lock(&sd_index_lock);
2596 error = ida_get_new(&sd_index_ida, &index);
2597 spin_unlock(&sd_index_lock);
2598 } while (error == -EAGAIN);
2599
2600 if (error) {
2601 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2602 goto out_put;
2603 }
2604
2605 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2606 if (error) {
2607 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2608 goto out_free_index;
2609 }
2610
2611 sdkp->device = sdp;
2612 sdkp->driver = &sd_template;
2613 sdkp->disk = gd;
2614 sdkp->index = index;
2615 atomic_set(&sdkp->openers, 0);
2616
2617 if (!sdp->request_queue->rq_timeout) {
2618 if (sdp->type != TYPE_MOD)
2619 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2620 else
2621 blk_queue_rq_timeout(sdp->request_queue,
2622 SD_MOD_TIMEOUT);
2623 }
2624
2625 device_initialize(&sdkp->dev);
2626 sdkp->dev.parent = dev;
2627 sdkp->dev.class = &sd_disk_class;
2628 dev_set_name(&sdkp->dev, dev_name(dev));
2629
2630 if (device_add(&sdkp->dev))
2631 goto out_free_index;
2632
2633 get_device(dev);
2634 dev_set_drvdata(dev, sdkp);
2635
2636 get_device(&sdkp->dev); /* prevent release before async_schedule */
2637 async_schedule(sd_probe_async, sdkp);
2638
2639 return 0;
2640
2641 out_free_index:
2642 spin_lock(&sd_index_lock);
2643 ida_remove(&sd_index_ida, index);
2644 spin_unlock(&sd_index_lock);
2645 out_put:
2646 put_disk(gd);
2647 out_free:
2648 kfree(sdkp);
2649 out:
2650 return error;
2651 }
2652
2653 /**
2654 * sd_remove - called whenever a scsi disk (previously recognized by
2655 * sd_probe) is detached from the system. It is called (potentially
2656 * multiple times) during sd module unload.
2657 * @sdp: pointer to mid level scsi device object
2658 *
2659 * Note: this function is invoked from the scsi mid-level.
2660 * This function potentially frees up a device name (e.g. /dev/sdc)
2661 * that could be re-used by a subsequent sd_probe().
2662 * This function is not called when the built-in sd driver is "exit-ed".
2663 **/
2664 static int sd_remove(struct device *dev)
2665 {
2666 struct scsi_disk *sdkp;
2667
2668 sdkp = dev_get_drvdata(dev);
2669 scsi_autopm_get_device(sdkp->device);
2670
2671 async_synchronize_full();
2672 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2673 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2674 device_del(&sdkp->dev);
2675 del_gendisk(sdkp->disk);
2676 sd_shutdown(dev);
2677
2678 mutex_lock(&sd_ref_mutex);
2679 dev_set_drvdata(dev, NULL);
2680 put_device(&sdkp->dev);
2681 mutex_unlock(&sd_ref_mutex);
2682
2683 return 0;
2684 }
2685
2686 /**
2687 * scsi_disk_release - Called to free the scsi_disk structure
2688 * @dev: pointer to embedded class device
2689 *
2690 * sd_ref_mutex must be held entering this routine. Because it is
2691 * called on last put, you should always use the scsi_disk_get()
2692 * scsi_disk_put() helpers which manipulate the semaphore directly
2693 * and never do a direct put_device.
2694 **/
2695 static void scsi_disk_release(struct device *dev)
2696 {
2697 struct scsi_disk *sdkp = to_scsi_disk(dev);
2698 struct gendisk *disk = sdkp->disk;
2699
2700 spin_lock(&sd_index_lock);
2701 ida_remove(&sd_index_ida, sdkp->index);
2702 spin_unlock(&sd_index_lock);
2703
2704 disk->private_data = NULL;
2705 put_disk(disk);
2706 put_device(&sdkp->device->sdev_gendev);
2707
2708 kfree(sdkp);
2709 }
2710
2711 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2712 {
2713 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2714 struct scsi_sense_hdr sshdr;
2715 struct scsi_device *sdp = sdkp->device;
2716 int res;
2717
2718 if (start)
2719 cmd[4] |= 1; /* START */
2720
2721 if (sdp->start_stop_pwr_cond)
2722 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2723
2724 if (!scsi_device_online(sdp))
2725 return -ENODEV;
2726
2727 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2728 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2729 if (res) {
2730 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2731 sd_print_result(sdkp, res);
2732 if (driver_byte(res) & DRIVER_SENSE)
2733 sd_print_sense_hdr(sdkp, &sshdr);
2734 }
2735
2736 return res;
2737 }
2738
2739 /*
2740 * Send a SYNCHRONIZE CACHE instruction down to the device through
2741 * the normal SCSI command structure. Wait for the command to
2742 * complete.
2743 */
2744 static void sd_shutdown(struct device *dev)
2745 {
2746 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2747
2748 if (!sdkp)
2749 return; /* this can happen */
2750
2751 if (sdkp->WCE) {
2752 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2753 sd_sync_cache(sdkp);
2754 }
2755
2756 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2757 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2758 sd_start_stop_device(sdkp, 0);
2759 }
2760
2761 scsi_disk_put(sdkp);
2762 }
2763
2764 static int sd_suspend(struct device *dev, pm_message_t mesg)
2765 {
2766 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2767 int ret = 0;
2768
2769 if (!sdkp)
2770 return 0; /* this can happen */
2771
2772 if (sdkp->WCE) {
2773 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2774 ret = sd_sync_cache(sdkp);
2775 if (ret)
2776 goto done;
2777 }
2778
2779 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2780 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2781 ret = sd_start_stop_device(sdkp, 0);
2782 }
2783
2784 done:
2785 scsi_disk_put(sdkp);
2786 return ret;
2787 }
2788
2789 static int sd_resume(struct device *dev)
2790 {
2791 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2792 int ret = 0;
2793
2794 if (!sdkp->device->manage_start_stop)
2795 goto done;
2796
2797 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2798 ret = sd_start_stop_device(sdkp, 1);
2799
2800 done:
2801 scsi_disk_put(sdkp);
2802 return ret;
2803 }
2804
2805 /**
2806 * init_sd - entry point for this driver (both when built in or when
2807 * a module).
2808 *
2809 * Note: this function registers this driver with the scsi mid-level.
2810 **/
2811 static int __init init_sd(void)
2812 {
2813 int majors = 0, i, err;
2814
2815 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2816
2817 for (i = 0; i < SD_MAJORS; i++)
2818 if (register_blkdev(sd_major(i), "sd") == 0)
2819 majors++;
2820
2821 if (!majors)
2822 return -ENODEV;
2823
2824 err = class_register(&sd_disk_class);
2825 if (err)
2826 goto err_out;
2827
2828 err = scsi_register_driver(&sd_template.gendrv);
2829 if (err)
2830 goto err_out_class;
2831
2832 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2833 0, 0, NULL);
2834 if (!sd_cdb_cache) {
2835 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2836 goto err_out_class;
2837 }
2838
2839 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2840 if (!sd_cdb_pool) {
2841 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2842 goto err_out_cache;
2843 }
2844
2845 return 0;
2846
2847 err_out_cache:
2848 kmem_cache_destroy(sd_cdb_cache);
2849
2850 err_out_class:
2851 class_unregister(&sd_disk_class);
2852 err_out:
2853 for (i = 0; i < SD_MAJORS; i++)
2854 unregister_blkdev(sd_major(i), "sd");
2855 return err;
2856 }
2857
2858 /**
2859 * exit_sd - exit point for this driver (when it is a module).
2860 *
2861 * Note: this function unregisters this driver from the scsi mid-level.
2862 **/
2863 static void __exit exit_sd(void)
2864 {
2865 int i;
2866
2867 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2868
2869 mempool_destroy(sd_cdb_pool);
2870 kmem_cache_destroy(sd_cdb_cache);
2871
2872 scsi_unregister_driver(&sd_template.gendrv);
2873 class_unregister(&sd_disk_class);
2874
2875 for (i = 0; i < SD_MAJORS; i++)
2876 unregister_blkdev(sd_major(i), "sd");
2877 }
2878
2879 module_init(init_sd);
2880 module_exit(exit_sd);
2881
2882 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2883 struct scsi_sense_hdr *sshdr)
2884 {
2885 sd_printk(KERN_INFO, sdkp, " ");
2886 scsi_show_sense_hdr(sshdr);
2887 sd_printk(KERN_INFO, sdkp, " ");
2888 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2889 }
2890
2891 static void sd_print_result(struct scsi_disk *sdkp, int result)
2892 {
2893 sd_printk(KERN_INFO, sdkp, " ");
2894 scsi_show_result(result);
2895 }
2896
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree