[SCSI] Handle disk devices which can not process medium access commands
[linux-3.10.git] / drivers / scsi / sd.c
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_logging.h"
69
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
73
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
95 #define SD_MINORS       16
96 #else
97 #define SD_MINORS       0
98 #endif
99
100 static void sd_config_discard(struct scsi_disk *, unsigned int);
101 static int  sd_revalidate_disk(struct gendisk *);
102 static void sd_unlock_native_capacity(struct gendisk *disk);
103 static int  sd_probe(struct device *);
104 static int  sd_remove(struct device *);
105 static void sd_shutdown(struct device *);
106 static int sd_suspend(struct device *, pm_message_t state);
107 static int sd_resume(struct device *);
108 static void sd_rescan(struct device *);
109 static int sd_done(struct scsi_cmnd *);
110 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
111 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
112 static void scsi_disk_release(struct device *cdev);
113 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
114 static void sd_print_result(struct scsi_disk *, int);
115
116 static DEFINE_SPINLOCK(sd_index_lock);
117 static DEFINE_IDA(sd_index_ida);
118
119 /* This semaphore is used to mediate the 0->1 reference get in the
120  * face of object destruction (i.e. we can't allow a get on an
121  * object after last put) */
122 static DEFINE_MUTEX(sd_ref_mutex);
123
124 static struct kmem_cache *sd_cdb_cache;
125 static mempool_t *sd_cdb_pool;
126
127 static const char *sd_cache_types[] = {
128         "write through", "none", "write back",
129         "write back, no read (daft)"
130 };
131
132 static ssize_t
133 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
134                     const char *buf, size_t count)
135 {
136         int i, ct = -1, rcd, wce, sp;
137         struct scsi_disk *sdkp = to_scsi_disk(dev);
138         struct scsi_device *sdp = sdkp->device;
139         char buffer[64];
140         char *buffer_data;
141         struct scsi_mode_data data;
142         struct scsi_sense_hdr sshdr;
143         int len;
144
145         if (sdp->type != TYPE_DISK)
146                 /* no cache control on RBC devices; theoretically they
147                  * can do it, but there's probably so many exceptions
148                  * it's not worth the risk */
149                 return -EINVAL;
150
151         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
152                 len = strlen(sd_cache_types[i]);
153                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
154                     buf[len] == '\n') {
155                         ct = i;
156                         break;
157                 }
158         }
159         if (ct < 0)
160                 return -EINVAL;
161         rcd = ct & 0x01 ? 1 : 0;
162         wce = ct & 0x02 ? 1 : 0;
163         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
164                             SD_MAX_RETRIES, &data, NULL))
165                 return -EINVAL;
166         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
167                   data.block_descriptor_length);
168         buffer_data = buffer + data.header_length +
169                 data.block_descriptor_length;
170         buffer_data[2] &= ~0x05;
171         buffer_data[2] |= wce << 2 | rcd;
172         sp = buffer_data[0] & 0x80 ? 1 : 0;
173
174         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
175                              SD_MAX_RETRIES, &data, &sshdr)) {
176                 if (scsi_sense_valid(&sshdr))
177                         sd_print_sense_hdr(sdkp, &sshdr);
178                 return -EINVAL;
179         }
180         revalidate_disk(sdkp->disk);
181         return count;
182 }
183
184 static ssize_t
185 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
186                            const char *buf, size_t count)
187 {
188         struct scsi_disk *sdkp = to_scsi_disk(dev);
189         struct scsi_device *sdp = sdkp->device;
190
191         if (!capable(CAP_SYS_ADMIN))
192                 return -EACCES;
193
194         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
195
196         return count;
197 }
198
199 static ssize_t
200 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
201                        const char *buf, size_t count)
202 {
203         struct scsi_disk *sdkp = to_scsi_disk(dev);
204         struct scsi_device *sdp = sdkp->device;
205
206         if (!capable(CAP_SYS_ADMIN))
207                 return -EACCES;
208
209         if (sdp->type != TYPE_DISK)
210                 return -EINVAL;
211
212         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
213
214         return count;
215 }
216
217 static ssize_t
218 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
219                    char *buf)
220 {
221         struct scsi_disk *sdkp = to_scsi_disk(dev);
222         int ct = sdkp->RCD + 2*sdkp->WCE;
223
224         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
225 }
226
227 static ssize_t
228 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
229 {
230         struct scsi_disk *sdkp = to_scsi_disk(dev);
231
232         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
233 }
234
235 static ssize_t
236 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
237                           char *buf)
238 {
239         struct scsi_disk *sdkp = to_scsi_disk(dev);
240         struct scsi_device *sdp = sdkp->device;
241
242         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
243 }
244
245 static ssize_t
246 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
247                       char *buf)
248 {
249         struct scsi_disk *sdkp = to_scsi_disk(dev);
250
251         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252 }
253
254 static ssize_t
255 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
256                         char *buf)
257 {
258         struct scsi_disk *sdkp = to_scsi_disk(dev);
259
260         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
261 }
262
263 static ssize_t
264 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
265                         char *buf)
266 {
267         struct scsi_disk *sdkp = to_scsi_disk(dev);
268         struct scsi_device *sdp = sdkp->device;
269         unsigned int dif, dix;
270
271         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
272         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
273
274         if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
275                 dif = 0;
276                 dix = 1;
277         }
278
279         if (!dif && !dix)
280                 return snprintf(buf, 20, "none\n");
281
282         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
283 }
284
285 static ssize_t
286 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
287                     char *buf)
288 {
289         struct scsi_disk *sdkp = to_scsi_disk(dev);
290
291         return snprintf(buf, 20, "%u\n", sdkp->ATO);
292 }
293
294 static ssize_t
295 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
296                           char *buf)
297 {
298         struct scsi_disk *sdkp = to_scsi_disk(dev);
299
300         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
301 }
302
303 static const char *lbp_mode[] = {
304         [SD_LBP_FULL]           = "full",
305         [SD_LBP_UNMAP]          = "unmap",
306         [SD_LBP_WS16]           = "writesame_16",
307         [SD_LBP_WS10]           = "writesame_10",
308         [SD_LBP_ZERO]           = "writesame_zero",
309         [SD_LBP_DISABLE]        = "disabled",
310 };
311
312 static ssize_t
313 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
314                           char *buf)
315 {
316         struct scsi_disk *sdkp = to_scsi_disk(dev);
317
318         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
319 }
320
321 static ssize_t
322 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
323                            const char *buf, size_t count)
324 {
325         struct scsi_disk *sdkp = to_scsi_disk(dev);
326         struct scsi_device *sdp = sdkp->device;
327
328         if (!capable(CAP_SYS_ADMIN))
329                 return -EACCES;
330
331         if (sdp->type != TYPE_DISK)
332                 return -EINVAL;
333
334         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
335                 sd_config_discard(sdkp, SD_LBP_UNMAP);
336         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
337                 sd_config_discard(sdkp, SD_LBP_WS16);
338         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
339                 sd_config_discard(sdkp, SD_LBP_WS10);
340         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
341                 sd_config_discard(sdkp, SD_LBP_ZERO);
342         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
343                 sd_config_discard(sdkp, SD_LBP_DISABLE);
344         else
345                 return -EINVAL;
346
347         return count;
348 }
349
350 static ssize_t
351 sd_show_max_medium_access_timeouts(struct device *dev,
352                                    struct device_attribute *attr, char *buf)
353 {
354         struct scsi_disk *sdkp = to_scsi_disk(dev);
355
356         return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
357 }
358
359 static ssize_t
360 sd_store_max_medium_access_timeouts(struct device *dev,
361                                     struct device_attribute *attr,
362                                     const char *buf, size_t count)
363 {
364         struct scsi_disk *sdkp = to_scsi_disk(dev);
365         int err;
366
367         if (!capable(CAP_SYS_ADMIN))
368                 return -EACCES;
369
370         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
371
372         return err ? err : count;
373 }
374
375 static struct device_attribute sd_disk_attrs[] = {
376         __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
377                sd_store_cache_type),
378         __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
379         __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
380                sd_store_allow_restart),
381         __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
382                sd_store_manage_start_stop),
383         __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
384         __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
385         __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
386         __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
387         __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
388                sd_store_provisioning_mode),
389         __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
390                sd_show_max_medium_access_timeouts,
391                sd_store_max_medium_access_timeouts),
392         __ATTR_NULL,
393 };
394
395 static struct class sd_disk_class = {
396         .name           = "scsi_disk",
397         .owner          = THIS_MODULE,
398         .dev_release    = scsi_disk_release,
399         .dev_attrs      = sd_disk_attrs,
400 };
401
402 static struct scsi_driver sd_template = {
403         .owner                  = THIS_MODULE,
404         .gendrv = {
405                 .name           = "sd",
406                 .probe          = sd_probe,
407                 .remove         = sd_remove,
408                 .suspend        = sd_suspend,
409                 .resume         = sd_resume,
410                 .shutdown       = sd_shutdown,
411         },
412         .rescan                 = sd_rescan,
413         .done                   = sd_done,
414         .eh_action              = sd_eh_action,
415 };
416
417 /*
418  * Device no to disk mapping:
419  * 
420  *       major         disc2     disc  p1
421  *   |............|.............|....|....| <- dev_t
422  *    31        20 19          8 7  4 3  0
423  * 
424  * Inside a major, we have 16k disks, however mapped non-
425  * contiguously. The first 16 disks are for major0, the next
426  * ones with major1, ... Disk 256 is for major0 again, disk 272 
427  * for major1, ... 
428  * As we stay compatible with our numbering scheme, we can reuse 
429  * the well-know SCSI majors 8, 65--71, 136--143.
430  */
431 static int sd_major(int major_idx)
432 {
433         switch (major_idx) {
434         case 0:
435                 return SCSI_DISK0_MAJOR;
436         case 1 ... 7:
437                 return SCSI_DISK1_MAJOR + major_idx - 1;
438         case 8 ... 15:
439                 return SCSI_DISK8_MAJOR + major_idx - 8;
440         default:
441                 BUG();
442                 return 0;       /* shut up gcc */
443         }
444 }
445
446 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
447 {
448         struct scsi_disk *sdkp = NULL;
449
450         if (disk->private_data) {
451                 sdkp = scsi_disk(disk);
452                 if (scsi_device_get(sdkp->device) == 0)
453                         get_device(&sdkp->dev);
454                 else
455                         sdkp = NULL;
456         }
457         return sdkp;
458 }
459
460 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
461 {
462         struct scsi_disk *sdkp;
463
464         mutex_lock(&sd_ref_mutex);
465         sdkp = __scsi_disk_get(disk);
466         mutex_unlock(&sd_ref_mutex);
467         return sdkp;
468 }
469
470 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
471 {
472         struct scsi_disk *sdkp;
473
474         mutex_lock(&sd_ref_mutex);
475         sdkp = dev_get_drvdata(dev);
476         if (sdkp)
477                 sdkp = __scsi_disk_get(sdkp->disk);
478         mutex_unlock(&sd_ref_mutex);
479         return sdkp;
480 }
481
482 static void scsi_disk_put(struct scsi_disk *sdkp)
483 {
484         struct scsi_device *sdev = sdkp->device;
485
486         mutex_lock(&sd_ref_mutex);
487         put_device(&sdkp->dev);
488         scsi_device_put(sdev);
489         mutex_unlock(&sd_ref_mutex);
490 }
491
492 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
493 {
494         unsigned int prot_op = SCSI_PROT_NORMAL;
495         unsigned int dix = scsi_prot_sg_count(scmd);
496
497         if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
498                 if (dif && dix)
499                         prot_op = SCSI_PROT_READ_PASS;
500                 else if (dif && !dix)
501                         prot_op = SCSI_PROT_READ_STRIP;
502                 else if (!dif && dix)
503                         prot_op = SCSI_PROT_READ_INSERT;
504         } else {
505                 if (dif && dix)
506                         prot_op = SCSI_PROT_WRITE_PASS;
507                 else if (dif && !dix)
508                         prot_op = SCSI_PROT_WRITE_INSERT;
509                 else if (!dif && dix)
510                         prot_op = SCSI_PROT_WRITE_STRIP;
511         }
512
513         scsi_set_prot_op(scmd, prot_op);
514         scsi_set_prot_type(scmd, dif);
515 }
516
517 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
518 {
519         struct request_queue *q = sdkp->disk->queue;
520         unsigned int logical_block_size = sdkp->device->sector_size;
521         unsigned int max_blocks = 0;
522
523         q->limits.discard_zeroes_data = sdkp->lbprz;
524         q->limits.discard_alignment = sdkp->unmap_alignment *
525                 logical_block_size;
526         q->limits.discard_granularity =
527                 max(sdkp->physical_block_size,
528                     sdkp->unmap_granularity * logical_block_size);
529
530         sdkp->provisioning_mode = mode;
531
532         switch (mode) {
533
534         case SD_LBP_DISABLE:
535                 q->limits.max_discard_sectors = 0;
536                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
537                 return;
538
539         case SD_LBP_UNMAP:
540                 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
541                 break;
542
543         case SD_LBP_WS16:
544                 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
545                 break;
546
547         case SD_LBP_WS10:
548                 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
549                 break;
550
551         case SD_LBP_ZERO:
552                 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
553                 q->limits.discard_zeroes_data = 1;
554                 break;
555         }
556
557         q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
558         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
559 }
560
561 /**
562  * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
563  * @sdp: scsi device to operate one
564  * @rq: Request to prepare
565  *
566  * Will issue either UNMAP or WRITE SAME(16) depending on preference
567  * indicated by target device.
568  **/
569 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
570 {
571         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
572         struct bio *bio = rq->bio;
573         sector_t sector = bio->bi_sector;
574         unsigned int nr_sectors = bio_sectors(bio);
575         unsigned int len;
576         int ret;
577         char *buf;
578         struct page *page;
579
580         if (sdkp->device->sector_size == 4096) {
581                 sector >>= 3;
582                 nr_sectors >>= 3;
583         }
584
585         rq->timeout = SD_TIMEOUT;
586
587         memset(rq->cmd, 0, rq->cmd_len);
588
589         page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
590         if (!page)
591                 return BLKPREP_DEFER;
592
593         switch (sdkp->provisioning_mode) {
594         case SD_LBP_UNMAP:
595                 buf = page_address(page);
596
597                 rq->cmd_len = 10;
598                 rq->cmd[0] = UNMAP;
599                 rq->cmd[8] = 24;
600
601                 put_unaligned_be16(6 + 16, &buf[0]);
602                 put_unaligned_be16(16, &buf[2]);
603                 put_unaligned_be64(sector, &buf[8]);
604                 put_unaligned_be32(nr_sectors, &buf[16]);
605
606                 len = 24;
607                 break;
608
609         case SD_LBP_WS16:
610                 rq->cmd_len = 16;
611                 rq->cmd[0] = WRITE_SAME_16;
612                 rq->cmd[1] = 0x8; /* UNMAP */
613                 put_unaligned_be64(sector, &rq->cmd[2]);
614                 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
615
616                 len = sdkp->device->sector_size;
617                 break;
618
619         case SD_LBP_WS10:
620         case SD_LBP_ZERO:
621                 rq->cmd_len = 10;
622                 rq->cmd[0] = WRITE_SAME;
623                 if (sdkp->provisioning_mode == SD_LBP_WS10)
624                         rq->cmd[1] = 0x8; /* UNMAP */
625                 put_unaligned_be32(sector, &rq->cmd[2]);
626                 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
627
628                 len = sdkp->device->sector_size;
629                 break;
630
631         default:
632                 ret = BLKPREP_KILL;
633                 goto out;
634         }
635
636         blk_add_request_payload(rq, page, len);
637         ret = scsi_setup_blk_pc_cmnd(sdp, rq);
638         rq->buffer = page_address(page);
639
640 out:
641         if (ret != BLKPREP_OK) {
642                 __free_page(page);
643                 rq->buffer = NULL;
644         }
645         return ret;
646 }
647
648 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
649 {
650         rq->timeout = SD_FLUSH_TIMEOUT;
651         rq->retries = SD_MAX_RETRIES;
652         rq->cmd[0] = SYNCHRONIZE_CACHE;
653         rq->cmd_len = 10;
654
655         return scsi_setup_blk_pc_cmnd(sdp, rq);
656 }
657
658 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
659 {
660         if (rq->cmd_flags & REQ_DISCARD) {
661                 free_page((unsigned long)rq->buffer);
662                 rq->buffer = NULL;
663         }
664 }
665
666 /**
667  *      sd_init_command - build a scsi (read or write) command from
668  *      information in the request structure.
669  *      @SCpnt: pointer to mid-level's per scsi command structure that
670  *      contains request and into which the scsi command is written
671  *
672  *      Returns 1 if successful and 0 if error (or cannot be done now).
673  **/
674 static int sd_prep_fn(struct request_queue *q, struct request *rq)
675 {
676         struct scsi_cmnd *SCpnt;
677         struct scsi_device *sdp = q->queuedata;
678         struct gendisk *disk = rq->rq_disk;
679         struct scsi_disk *sdkp;
680         sector_t block = blk_rq_pos(rq);
681         sector_t threshold;
682         unsigned int this_count = blk_rq_sectors(rq);
683         int ret, host_dif;
684         unsigned char protect;
685
686         /*
687          * Discard request come in as REQ_TYPE_FS but we turn them into
688          * block PC requests to make life easier.
689          */
690         if (rq->cmd_flags & REQ_DISCARD) {
691                 ret = scsi_setup_discard_cmnd(sdp, rq);
692                 goto out;
693         } else if (rq->cmd_flags & REQ_FLUSH) {
694                 ret = scsi_setup_flush_cmnd(sdp, rq);
695                 goto out;
696         } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
697                 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
698                 goto out;
699         } else if (rq->cmd_type != REQ_TYPE_FS) {
700                 ret = BLKPREP_KILL;
701                 goto out;
702         }
703         ret = scsi_setup_fs_cmnd(sdp, rq);
704         if (ret != BLKPREP_OK)
705                 goto out;
706         SCpnt = rq->special;
707         sdkp = scsi_disk(disk);
708
709         /* from here on until we're complete, any goto out
710          * is used for a killable error condition */
711         ret = BLKPREP_KILL;
712
713         SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
714                                         "sd_init_command: block=%llu, "
715                                         "count=%d\n",
716                                         (unsigned long long)block,
717                                         this_count));
718
719         if (!sdp || !scsi_device_online(sdp) ||
720             block + blk_rq_sectors(rq) > get_capacity(disk)) {
721                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
722                                                 "Finishing %u sectors\n",
723                                                 blk_rq_sectors(rq)));
724                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
725                                                 "Retry with 0x%p\n", SCpnt));
726                 goto out;
727         }
728
729         if (sdp->changed) {
730                 /*
731                  * quietly refuse to do anything to a changed disc until 
732                  * the changed bit has been reset
733                  */
734                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
735                 goto out;
736         }
737
738         /*
739          * Some SD card readers can't handle multi-sector accesses which touch
740          * the last one or two hardware sectors.  Split accesses as needed.
741          */
742         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
743                 (sdp->sector_size / 512);
744
745         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
746                 if (block < threshold) {
747                         /* Access up to the threshold but not beyond */
748                         this_count = threshold - block;
749                 } else {
750                         /* Access only a single hardware sector */
751                         this_count = sdp->sector_size / 512;
752                 }
753         }
754
755         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
756                                         (unsigned long long)block));
757
758         /*
759          * If we have a 1K hardware sectorsize, prevent access to single
760          * 512 byte sectors.  In theory we could handle this - in fact
761          * the scsi cdrom driver must be able to handle this because
762          * we typically use 1K blocksizes, and cdroms typically have
763          * 2K hardware sectorsizes.  Of course, things are simpler
764          * with the cdrom, since it is read-only.  For performance
765          * reasons, the filesystems should be able to handle this
766          * and not force the scsi disk driver to use bounce buffers
767          * for this.
768          */
769         if (sdp->sector_size == 1024) {
770                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
771                         scmd_printk(KERN_ERR, SCpnt,
772                                     "Bad block number requested\n");
773                         goto out;
774                 } else {
775                         block = block >> 1;
776                         this_count = this_count >> 1;
777                 }
778         }
779         if (sdp->sector_size == 2048) {
780                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
781                         scmd_printk(KERN_ERR, SCpnt,
782                                     "Bad block number requested\n");
783                         goto out;
784                 } else {
785                         block = block >> 2;
786                         this_count = this_count >> 2;
787                 }
788         }
789         if (sdp->sector_size == 4096) {
790                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
791                         scmd_printk(KERN_ERR, SCpnt,
792                                     "Bad block number requested\n");
793                         goto out;
794                 } else {
795                         block = block >> 3;
796                         this_count = this_count >> 3;
797                 }
798         }
799         if (rq_data_dir(rq) == WRITE) {
800                 if (!sdp->writeable) {
801                         goto out;
802                 }
803                 SCpnt->cmnd[0] = WRITE_6;
804                 SCpnt->sc_data_direction = DMA_TO_DEVICE;
805
806                 if (blk_integrity_rq(rq) &&
807                     sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
808                         goto out;
809
810         } else if (rq_data_dir(rq) == READ) {
811                 SCpnt->cmnd[0] = READ_6;
812                 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
813         } else {
814                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
815                 goto out;
816         }
817
818         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
819                                         "%s %d/%u 512 byte blocks.\n",
820                                         (rq_data_dir(rq) == WRITE) ?
821                                         "writing" : "reading", this_count,
822                                         blk_rq_sectors(rq)));
823
824         /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
825         host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
826         if (host_dif)
827                 protect = 1 << 5;
828         else
829                 protect = 0;
830
831         if (host_dif == SD_DIF_TYPE2_PROTECTION) {
832                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
833
834                 if (unlikely(SCpnt->cmnd == NULL)) {
835                         ret = BLKPREP_DEFER;
836                         goto out;
837                 }
838
839                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
840                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
841                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
842                 SCpnt->cmnd[7] = 0x18;
843                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
844                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
845
846                 /* LBA */
847                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
848                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
849                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
850                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
851                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
852                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
853                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
854                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
855
856                 /* Expected Indirect LBA */
857                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
858                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
859                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
860                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
861
862                 /* Transfer length */
863                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
864                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
865                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
866                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
867         } else if (block > 0xffffffff) {
868                 SCpnt->cmnd[0] += READ_16 - READ_6;
869                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
870                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
871                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
872                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
873                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
874                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
875                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
876                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
877                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
878                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
879                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
880                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
881                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
882                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
883         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
884                    scsi_device_protection(SCpnt->device) ||
885                    SCpnt->device->use_10_for_rw) {
886                 if (this_count > 0xffff)
887                         this_count = 0xffff;
888
889                 SCpnt->cmnd[0] += READ_10 - READ_6;
890                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
891                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
892                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
893                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
894                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
895                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
896                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
897                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
898         } else {
899                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
900                         /*
901                          * This happens only if this drive failed
902                          * 10byte rw command with ILLEGAL_REQUEST
903                          * during operation and thus turned off
904                          * use_10_for_rw.
905                          */
906                         scmd_printk(KERN_ERR, SCpnt,
907                                     "FUA write on READ/WRITE(6) drive\n");
908                         goto out;
909                 }
910
911                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
912                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
913                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
914                 SCpnt->cmnd[4] = (unsigned char) this_count;
915                 SCpnt->cmnd[5] = 0;
916         }
917         SCpnt->sdb.length = this_count * sdp->sector_size;
918
919         /* If DIF or DIX is enabled, tell HBA how to handle request */
920         if (host_dif || scsi_prot_sg_count(SCpnt))
921                 sd_prot_op(SCpnt, host_dif);
922
923         /*
924          * We shouldn't disconnect in the middle of a sector, so with a dumb
925          * host adapter, it's safe to assume that we can at least transfer
926          * this many bytes between each connect / disconnect.
927          */
928         SCpnt->transfersize = sdp->sector_size;
929         SCpnt->underflow = this_count << 9;
930         SCpnt->allowed = SD_MAX_RETRIES;
931
932         /*
933          * This indicates that the command is ready from our end to be
934          * queued.
935          */
936         ret = BLKPREP_OK;
937  out:
938         return scsi_prep_return(q, rq, ret);
939 }
940
941 /**
942  *      sd_open - open a scsi disk device
943  *      @inode: only i_rdev member may be used
944  *      @filp: only f_mode and f_flags may be used
945  *
946  *      Returns 0 if successful. Returns a negated errno value in case 
947  *      of error.
948  *
949  *      Note: This can be called from a user context (e.g. fsck(1) )
950  *      or from within the kernel (e.g. as a result of a mount(1) ).
951  *      In the latter case @inode and @filp carry an abridged amount
952  *      of information as noted above.
953  *
954  *      Locking: called with bdev->bd_mutex held.
955  **/
956 static int sd_open(struct block_device *bdev, fmode_t mode)
957 {
958         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
959         struct scsi_device *sdev;
960         int retval;
961
962         if (!sdkp)
963                 return -ENXIO;
964
965         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
966
967         sdev = sdkp->device;
968
969         retval = scsi_autopm_get_device(sdev);
970         if (retval)
971                 goto error_autopm;
972
973         /*
974          * If the device is in error recovery, wait until it is done.
975          * If the device is offline, then disallow any access to it.
976          */
977         retval = -ENXIO;
978         if (!scsi_block_when_processing_errors(sdev))
979                 goto error_out;
980
981         if (sdev->removable || sdkp->write_prot)
982                 check_disk_change(bdev);
983
984         /*
985          * If the drive is empty, just let the open fail.
986          */
987         retval = -ENOMEDIUM;
988         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
989                 goto error_out;
990
991         /*
992          * If the device has the write protect tab set, have the open fail
993          * if the user expects to be able to write to the thing.
994          */
995         retval = -EROFS;
996         if (sdkp->write_prot && (mode & FMODE_WRITE))
997                 goto error_out;
998
999         /*
1000          * It is possible that the disk changing stuff resulted in
1001          * the device being taken offline.  If this is the case,
1002          * report this to the user, and don't pretend that the
1003          * open actually succeeded.
1004          */
1005         retval = -ENXIO;
1006         if (!scsi_device_online(sdev))
1007                 goto error_out;
1008
1009         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1010                 if (scsi_block_when_processing_errors(sdev))
1011                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1012         }
1013
1014         return 0;
1015
1016 error_out:
1017         scsi_autopm_put_device(sdev);
1018 error_autopm:
1019         scsi_disk_put(sdkp);
1020         return retval;  
1021 }
1022
1023 /**
1024  *      sd_release - invoked when the (last) close(2) is called on this
1025  *      scsi disk.
1026  *      @inode: only i_rdev member may be used
1027  *      @filp: only f_mode and f_flags may be used
1028  *
1029  *      Returns 0. 
1030  *
1031  *      Note: may block (uninterruptible) if error recovery is underway
1032  *      on this disk.
1033  *
1034  *      Locking: called with bdev->bd_mutex held.
1035  **/
1036 static int sd_release(struct gendisk *disk, fmode_t mode)
1037 {
1038         struct scsi_disk *sdkp = scsi_disk(disk);
1039         struct scsi_device *sdev = sdkp->device;
1040
1041         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1042
1043         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1044                 if (scsi_block_when_processing_errors(sdev))
1045                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1046         }
1047
1048         /*
1049          * XXX and what if there are packets in flight and this close()
1050          * XXX is followed by a "rmmod sd_mod"?
1051          */
1052
1053         scsi_autopm_put_device(sdev);
1054         scsi_disk_put(sdkp);
1055         return 0;
1056 }
1057
1058 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1059 {
1060         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1061         struct scsi_device *sdp = sdkp->device;
1062         struct Scsi_Host *host = sdp->host;
1063         int diskinfo[4];
1064
1065         /* default to most commonly used values */
1066         diskinfo[0] = 0x40;     /* 1 << 6 */
1067         diskinfo[1] = 0x20;     /* 1 << 5 */
1068         diskinfo[2] = sdkp->capacity >> 11;
1069         
1070         /* override with calculated, extended default, or driver values */
1071         if (host->hostt->bios_param)
1072                 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1073         else
1074                 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1075
1076         geo->heads = diskinfo[0];
1077         geo->sectors = diskinfo[1];
1078         geo->cylinders = diskinfo[2];
1079         return 0;
1080 }
1081
1082 /**
1083  *      sd_ioctl - process an ioctl
1084  *      @inode: only i_rdev/i_bdev members may be used
1085  *      @filp: only f_mode and f_flags may be used
1086  *      @cmd: ioctl command number
1087  *      @arg: this is third argument given to ioctl(2) system call.
1088  *      Often contains a pointer.
1089  *
1090  *      Returns 0 if successful (some ioctls return positive numbers on
1091  *      success as well). Returns a negated errno value in case of error.
1092  *
1093  *      Note: most ioctls are forward onto the block subsystem or further
1094  *      down in the scsi subsystem.
1095  **/
1096 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1097                     unsigned int cmd, unsigned long arg)
1098 {
1099         struct gendisk *disk = bdev->bd_disk;
1100         struct scsi_disk *sdkp = scsi_disk(disk);
1101         struct scsi_device *sdp = sdkp->device;
1102         void __user *p = (void __user *)arg;
1103         int error;
1104     
1105         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1106                                     "cmd=0x%x\n", disk->disk_name, cmd));
1107
1108         error = scsi_verify_blk_ioctl(bdev, cmd);
1109         if (error < 0)
1110                 return error;
1111
1112         /*
1113          * If we are in the middle of error recovery, don't let anyone
1114          * else try and use this device.  Also, if error recovery fails, it
1115          * may try and take the device offline, in which case all further
1116          * access to the device is prohibited.
1117          */
1118         error = scsi_nonblockable_ioctl(sdp, cmd, p,
1119                                         (mode & FMODE_NDELAY) != 0);
1120         if (!scsi_block_when_processing_errors(sdp) || !error)
1121                 goto out;
1122
1123         /*
1124          * Send SCSI addressing ioctls directly to mid level, send other
1125          * ioctls to block level and then onto mid level if they can't be
1126          * resolved.
1127          */
1128         switch (cmd) {
1129                 case SCSI_IOCTL_GET_IDLUN:
1130                 case SCSI_IOCTL_GET_BUS_NUMBER:
1131                         error = scsi_ioctl(sdp, cmd, p);
1132                         break;
1133                 default:
1134                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1135                         if (error != -ENOTTY)
1136                                 break;
1137                         error = scsi_ioctl(sdp, cmd, p);
1138                         break;
1139         }
1140 out:
1141         return error;
1142 }
1143
1144 static void set_media_not_present(struct scsi_disk *sdkp)
1145 {
1146         if (sdkp->media_present)
1147                 sdkp->device->changed = 1;
1148
1149         if (sdkp->device->removable) {
1150                 sdkp->media_present = 0;
1151                 sdkp->capacity = 0;
1152         }
1153 }
1154
1155 static int media_not_present(struct scsi_disk *sdkp,
1156                              struct scsi_sense_hdr *sshdr)
1157 {
1158         if (!scsi_sense_valid(sshdr))
1159                 return 0;
1160
1161         /* not invoked for commands that could return deferred errors */
1162         switch (sshdr->sense_key) {
1163         case UNIT_ATTENTION:
1164         case NOT_READY:
1165                 /* medium not present */
1166                 if (sshdr->asc == 0x3A) {
1167                         set_media_not_present(sdkp);
1168                         return 1;
1169                 }
1170         }
1171         return 0;
1172 }
1173
1174 /**
1175  *      sd_check_events - check media events
1176  *      @disk: kernel device descriptor
1177  *      @clearing: disk events currently being cleared
1178  *
1179  *      Returns mask of DISK_EVENT_*.
1180  *
1181  *      Note: this function is invoked from the block subsystem.
1182  **/
1183 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1184 {
1185         struct scsi_disk *sdkp = scsi_disk(disk);
1186         struct scsi_device *sdp = sdkp->device;
1187         struct scsi_sense_hdr *sshdr = NULL;
1188         int retval;
1189
1190         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1191
1192         /*
1193          * If the device is offline, don't send any commands - just pretend as
1194          * if the command failed.  If the device ever comes back online, we
1195          * can deal with it then.  It is only because of unrecoverable errors
1196          * that we would ever take a device offline in the first place.
1197          */
1198         if (!scsi_device_online(sdp)) {
1199                 set_media_not_present(sdkp);
1200                 goto out;
1201         }
1202
1203         /*
1204          * Using TEST_UNIT_READY enables differentiation between drive with
1205          * no cartridge loaded - NOT READY, drive with changed cartridge -
1206          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1207          *
1208          * Drives that auto spin down. eg iomega jaz 1G, will be started
1209          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1210          * sd_revalidate() is called.
1211          */
1212         retval = -ENODEV;
1213
1214         if (scsi_block_when_processing_errors(sdp)) {
1215                 sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1216                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1217                                               sshdr);
1218         }
1219
1220         /* failed to execute TUR, assume media not present */
1221         if (host_byte(retval)) {
1222                 set_media_not_present(sdkp);
1223                 goto out;
1224         }
1225
1226         if (media_not_present(sdkp, sshdr))
1227                 goto out;
1228
1229         /*
1230          * For removable scsi disk we have to recognise the presence
1231          * of a disk in the drive.
1232          */
1233         if (!sdkp->media_present)
1234                 sdp->changed = 1;
1235         sdkp->media_present = 1;
1236 out:
1237         /*
1238          * sdp->changed is set under the following conditions:
1239          *
1240          *      Medium present state has changed in either direction.
1241          *      Device has indicated UNIT_ATTENTION.
1242          */
1243         kfree(sshdr);
1244         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1245         sdp->changed = 0;
1246         return retval;
1247 }
1248
1249 static int sd_sync_cache(struct scsi_disk *sdkp)
1250 {
1251         int retries, res;
1252         struct scsi_device *sdp = sdkp->device;
1253         struct scsi_sense_hdr sshdr;
1254
1255         if (!scsi_device_online(sdp))
1256                 return -ENODEV;
1257
1258
1259         for (retries = 3; retries > 0; --retries) {
1260                 unsigned char cmd[10] = { 0 };
1261
1262                 cmd[0] = SYNCHRONIZE_CACHE;
1263                 /*
1264                  * Leave the rest of the command zero to indicate
1265                  * flush everything.
1266                  */
1267                 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1268                                        SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1269                 if (res == 0)
1270                         break;
1271         }
1272
1273         if (res) {
1274                 sd_print_result(sdkp, res);
1275                 if (driver_byte(res) & DRIVER_SENSE)
1276                         sd_print_sense_hdr(sdkp, &sshdr);
1277         }
1278
1279         if (res)
1280                 return -EIO;
1281         return 0;
1282 }
1283
1284 static void sd_rescan(struct device *dev)
1285 {
1286         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1287
1288         if (sdkp) {
1289                 revalidate_disk(sdkp->disk);
1290                 scsi_disk_put(sdkp);
1291         }
1292 }
1293
1294
1295 #ifdef CONFIG_COMPAT
1296 /* 
1297  * This gets directly called from VFS. When the ioctl 
1298  * is not recognized we go back to the other translation paths. 
1299  */
1300 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1301                            unsigned int cmd, unsigned long arg)
1302 {
1303         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1304         int ret;
1305
1306         ret = scsi_verify_blk_ioctl(bdev, cmd);
1307         if (ret < 0)
1308                 return ret;
1309
1310         /*
1311          * If we are in the middle of error recovery, don't let anyone
1312          * else try and use this device.  Also, if error recovery fails, it
1313          * may try and take the device offline, in which case all further
1314          * access to the device is prohibited.
1315          */
1316         if (!scsi_block_when_processing_errors(sdev))
1317                 return -ENODEV;
1318                
1319         if (sdev->host->hostt->compat_ioctl) {
1320                 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1321
1322                 return ret;
1323         }
1324
1325         /* 
1326          * Let the static ioctl translation table take care of it.
1327          */
1328         return -ENOIOCTLCMD; 
1329 }
1330 #endif
1331
1332 static const struct block_device_operations sd_fops = {
1333         .owner                  = THIS_MODULE,
1334         .open                   = sd_open,
1335         .release                = sd_release,
1336         .ioctl                  = sd_ioctl,
1337         .getgeo                 = sd_getgeo,
1338 #ifdef CONFIG_COMPAT
1339         .compat_ioctl           = sd_compat_ioctl,
1340 #endif
1341         .check_events           = sd_check_events,
1342         .revalidate_disk        = sd_revalidate_disk,
1343         .unlock_native_capacity = sd_unlock_native_capacity,
1344 };
1345
1346 /**
1347  *      sd_eh_action - error handling callback
1348  *      @scmd:          sd-issued command that has failed
1349  *      @eh_cmnd:       The command that was sent during error handling
1350  *      @eh_cmnd_len:   Length of eh_cmnd in bytes
1351  *      @eh_disp:       The recovery disposition suggested by the midlayer
1352  *
1353  *      This function is called by the SCSI midlayer upon completion of
1354  *      an error handling command (TEST UNIT READY, START STOP UNIT,
1355  *      etc.) The command sent to the device by the error handler is
1356  *      stored in eh_cmnd. The result of sending the eh command is
1357  *      passed in eh_disp.
1358  **/
1359 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1360                         int eh_cmnd_len, int eh_disp)
1361 {
1362         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1363
1364         if (!scsi_device_online(scmd->device) ||
1365             !scsi_medium_access_command(scmd))
1366                 return eh_disp;
1367
1368         /*
1369          * The device has timed out executing a medium access command.
1370          * However, the TEST UNIT READY command sent during error
1371          * handling completed successfully. Either the device is in the
1372          * process of recovering or has it suffered an internal failure
1373          * that prevents access to the storage medium.
1374          */
1375         if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1376             eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1377                 sdkp->medium_access_timed_out++;
1378
1379         /*
1380          * If the device keeps failing read/write commands but TEST UNIT
1381          * READY always completes successfully we assume that medium
1382          * access is no longer possible and take the device offline.
1383          */
1384         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1385                 scmd_printk(KERN_ERR, scmd,
1386                             "Medium access timeout failure. Offlining disk!\n");
1387                 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1388
1389                 return FAILED;
1390         }
1391
1392         return eh_disp;
1393 }
1394
1395 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1396 {
1397         u64 start_lba = blk_rq_pos(scmd->request);
1398         u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1399         u64 bad_lba;
1400         int info_valid;
1401         /*
1402          * resid is optional but mostly filled in.  When it's unused,
1403          * its value is zero, so we assume the whole buffer transferred
1404          */
1405         unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1406         unsigned int good_bytes;
1407
1408         if (scmd->request->cmd_type != REQ_TYPE_FS)
1409                 return 0;
1410
1411         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1412                                              SCSI_SENSE_BUFFERSIZE,
1413                                              &bad_lba);
1414         if (!info_valid)
1415                 return 0;
1416
1417         if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1418                 return 0;
1419
1420         if (scmd->device->sector_size < 512) {
1421                 /* only legitimate sector_size here is 256 */
1422                 start_lba <<= 1;
1423                 end_lba <<= 1;
1424         } else {
1425                 /* be careful ... don't want any overflows */
1426                 u64 factor = scmd->device->sector_size / 512;
1427                 do_div(start_lba, factor);
1428                 do_div(end_lba, factor);
1429         }
1430
1431         /* The bad lba was reported incorrectly, we have no idea where
1432          * the error is.
1433          */
1434         if (bad_lba < start_lba  || bad_lba >= end_lba)
1435                 return 0;
1436
1437         /* This computation should always be done in terms of
1438          * the resolution of the device's medium.
1439          */
1440         good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1441         return min(good_bytes, transferred);
1442 }
1443
1444 /**
1445  *      sd_done - bottom half handler: called when the lower level
1446  *      driver has completed (successfully or otherwise) a scsi command.
1447  *      @SCpnt: mid-level's per command structure.
1448  *
1449  *      Note: potentially run from within an ISR. Must not block.
1450  **/
1451 static int sd_done(struct scsi_cmnd *SCpnt)
1452 {
1453         int result = SCpnt->result;
1454         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1455         struct scsi_sense_hdr sshdr;
1456         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1457         int sense_valid = 0;
1458         int sense_deferred = 0;
1459         unsigned char op = SCpnt->cmnd[0];
1460
1461         if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1462                 scsi_set_resid(SCpnt, 0);
1463
1464         if (result) {
1465                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1466                 if (sense_valid)
1467                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1468         }
1469 #ifdef CONFIG_SCSI_LOGGING
1470         SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1471         if (sense_valid) {
1472                 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1473                                                    "sd_done: sb[respc,sk,asc,"
1474                                                    "ascq]=%x,%x,%x,%x\n",
1475                                                    sshdr.response_code,
1476                                                    sshdr.sense_key, sshdr.asc,
1477                                                    sshdr.ascq));
1478         }
1479 #endif
1480         if (driver_byte(result) != DRIVER_SENSE &&
1481             (!sense_valid || sense_deferred))
1482                 goto out;
1483
1484         sdkp->medium_access_timed_out = 0;
1485
1486         switch (sshdr.sense_key) {
1487         case HARDWARE_ERROR:
1488         case MEDIUM_ERROR:
1489                 good_bytes = sd_completed_bytes(SCpnt);
1490                 break;
1491         case RECOVERED_ERROR:
1492                 good_bytes = scsi_bufflen(SCpnt);
1493                 break;
1494         case NO_SENSE:
1495                 /* This indicates a false check condition, so ignore it.  An
1496                  * unknown amount of data was transferred so treat it as an
1497                  * error.
1498                  */
1499                 scsi_print_sense("sd", SCpnt);
1500                 SCpnt->result = 0;
1501                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1502                 break;
1503         case ABORTED_COMMAND:
1504                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1505                         good_bytes = sd_completed_bytes(SCpnt);
1506                 break;
1507         case ILLEGAL_REQUEST:
1508                 if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1509                         good_bytes = sd_completed_bytes(SCpnt);
1510                 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1511                 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1512                     (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1513                         sd_config_discard(sdkp, SD_LBP_DISABLE);
1514                 break;
1515         default:
1516                 break;
1517         }
1518  out:
1519         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1520                 sd_dif_complete(SCpnt, good_bytes);
1521
1522         if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1523             == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1524
1525                 /* We have to print a failed command here as the
1526                  * extended CDB gets freed before scsi_io_completion()
1527                  * is called.
1528                  */
1529                 if (result)
1530                         scsi_print_command(SCpnt);
1531
1532                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1533                 SCpnt->cmnd = NULL;
1534                 SCpnt->cmd_len = 0;
1535         }
1536
1537         return good_bytes;
1538 }
1539
1540 /*
1541  * spinup disk - called only in sd_revalidate_disk()
1542  */
1543 static void
1544 sd_spinup_disk(struct scsi_disk *sdkp)
1545 {
1546         unsigned char cmd[10];
1547         unsigned long spintime_expire = 0;
1548         int retries, spintime;
1549         unsigned int the_result;
1550         struct scsi_sense_hdr sshdr;
1551         int sense_valid = 0;
1552
1553         spintime = 0;
1554
1555         /* Spin up drives, as required.  Only do this at boot time */
1556         /* Spinup needs to be done for module loads too. */
1557         do {
1558                 retries = 0;
1559
1560                 do {
1561                         cmd[0] = TEST_UNIT_READY;
1562                         memset((void *) &cmd[1], 0, 9);
1563
1564                         the_result = scsi_execute_req(sdkp->device, cmd,
1565                                                       DMA_NONE, NULL, 0,
1566                                                       &sshdr, SD_TIMEOUT,
1567                                                       SD_MAX_RETRIES, NULL);
1568
1569                         /*
1570                          * If the drive has indicated to us that it
1571                          * doesn't have any media in it, don't bother
1572                          * with any more polling.
1573                          */
1574                         if (media_not_present(sdkp, &sshdr))
1575                                 return;
1576
1577                         if (the_result)
1578                                 sense_valid = scsi_sense_valid(&sshdr);
1579                         retries++;
1580                 } while (retries < 3 && 
1581                          (!scsi_status_is_good(the_result) ||
1582                           ((driver_byte(the_result) & DRIVER_SENSE) &&
1583                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1584
1585                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1586                         /* no sense, TUR either succeeded or failed
1587                          * with a status error */
1588                         if(!spintime && !scsi_status_is_good(the_result)) {
1589                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1590                                 sd_print_result(sdkp, the_result);
1591                         }
1592                         break;
1593                 }
1594                                         
1595                 /*
1596                  * The device does not want the automatic start to be issued.
1597                  */
1598                 if (sdkp->device->no_start_on_add)
1599                         break;
1600
1601                 if (sense_valid && sshdr.sense_key == NOT_READY) {
1602                         if (sshdr.asc == 4 && sshdr.ascq == 3)
1603                                 break;  /* manual intervention required */
1604                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1605                                 break;  /* standby */
1606                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1607                                 break;  /* unavailable */
1608                         /*
1609                          * Issue command to spin up drive when not ready
1610                          */
1611                         if (!spintime) {
1612                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1613                                 cmd[0] = START_STOP;
1614                                 cmd[1] = 1;     /* Return immediately */
1615                                 memset((void *) &cmd[2], 0, 8);
1616                                 cmd[4] = 1;     /* Start spin cycle */
1617                                 if (sdkp->device->start_stop_pwr_cond)
1618                                         cmd[4] |= 1 << 4;
1619                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1620                                                  NULL, 0, &sshdr,
1621                                                  SD_TIMEOUT, SD_MAX_RETRIES,
1622                                                  NULL);
1623                                 spintime_expire = jiffies + 100 * HZ;
1624                                 spintime = 1;
1625                         }
1626                         /* Wait 1 second for next try */
1627                         msleep(1000);
1628                         printk(".");
1629
1630                 /*
1631                  * Wait for USB flash devices with slow firmware.
1632                  * Yes, this sense key/ASC combination shouldn't
1633                  * occur here.  It's characteristic of these devices.
1634                  */
1635                 } else if (sense_valid &&
1636                                 sshdr.sense_key == UNIT_ATTENTION &&
1637                                 sshdr.asc == 0x28) {
1638                         if (!spintime) {
1639                                 spintime_expire = jiffies + 5 * HZ;
1640                                 spintime = 1;
1641                         }
1642                         /* Wait 1 second for next try */
1643                         msleep(1000);
1644                 } else {
1645                         /* we don't understand the sense code, so it's
1646                          * probably pointless to loop */
1647                         if(!spintime) {
1648                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1649                                 sd_print_sense_hdr(sdkp, &sshdr);
1650                         }
1651                         break;
1652                 }
1653                                 
1654         } while (spintime && time_before_eq(jiffies, spintime_expire));
1655
1656         if (spintime) {
1657                 if (scsi_status_is_good(the_result))
1658                         printk("ready\n");
1659                 else
1660                         printk("not responding...\n");
1661         }
1662 }
1663
1664
1665 /*
1666  * Determine whether disk supports Data Integrity Field.
1667  */
1668 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1669 {
1670         struct scsi_device *sdp = sdkp->device;
1671         u8 type;
1672
1673         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1674                 return;
1675
1676         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1677
1678         if (type == sdkp->protection_type || !sdkp->first_scan)
1679                 return;
1680
1681         sdkp->protection_type = type;
1682
1683         if (type > SD_DIF_TYPE3_PROTECTION) {
1684                 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1685                           "protection type %u. Disabling disk!\n", type);
1686                 sdkp->capacity = 0;
1687                 return;
1688         }
1689
1690         if (scsi_host_dif_capable(sdp->host, type))
1691                 sd_printk(KERN_NOTICE, sdkp,
1692                           "Enabling DIF Type %u protection\n", type);
1693         else
1694                 sd_printk(KERN_NOTICE, sdkp,
1695                           "Disabling DIF Type %u protection\n", type);
1696 }
1697
1698 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1699                         struct scsi_sense_hdr *sshdr, int sense_valid,
1700                         int the_result)
1701 {
1702         sd_print_result(sdkp, the_result);
1703         if (driver_byte(the_result) & DRIVER_SENSE)
1704                 sd_print_sense_hdr(sdkp, sshdr);
1705         else
1706                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1707
1708         /*
1709          * Set dirty bit for removable devices if not ready -
1710          * sometimes drives will not report this properly.
1711          */
1712         if (sdp->removable &&
1713             sense_valid && sshdr->sense_key == NOT_READY)
1714                 set_media_not_present(sdkp);
1715
1716         /*
1717          * We used to set media_present to 0 here to indicate no media
1718          * in the drive, but some drives fail read capacity even with
1719          * media present, so we can't do that.
1720          */
1721         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1722 }
1723
1724 #define RC16_LEN 32
1725 #if RC16_LEN > SD_BUF_SIZE
1726 #error RC16_LEN must not be more than SD_BUF_SIZE
1727 #endif
1728
1729 #define READ_CAPACITY_RETRIES_ON_RESET  10
1730
1731 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1732                                                 unsigned char *buffer)
1733 {
1734         unsigned char cmd[16];
1735         struct scsi_sense_hdr sshdr;
1736         int sense_valid = 0;
1737         int the_result;
1738         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1739         unsigned int alignment;
1740         unsigned long long lba;
1741         unsigned sector_size;
1742
1743         if (sdp->no_read_capacity_16)
1744                 return -EINVAL;
1745
1746         do {
1747                 memset(cmd, 0, 16);
1748                 cmd[0] = SERVICE_ACTION_IN;
1749                 cmd[1] = SAI_READ_CAPACITY_16;
1750                 cmd[13] = RC16_LEN;
1751                 memset(buffer, 0, RC16_LEN);
1752
1753                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1754                                         buffer, RC16_LEN, &sshdr,
1755                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1756
1757                 if (media_not_present(sdkp, &sshdr))
1758                         return -ENODEV;
1759
1760                 if (the_result) {
1761                         sense_valid = scsi_sense_valid(&sshdr);
1762                         if (sense_valid &&
1763                             sshdr.sense_key == ILLEGAL_REQUEST &&
1764                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1765                             sshdr.ascq == 0x00)
1766                                 /* Invalid Command Operation Code or
1767                                  * Invalid Field in CDB, just retry
1768                                  * silently with RC10 */
1769                                 return -EINVAL;
1770                         if (sense_valid &&
1771                             sshdr.sense_key == UNIT_ATTENTION &&
1772                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1773                                 /* Device reset might occur several times,
1774                                  * give it one more chance */
1775                                 if (--reset_retries > 0)
1776                                         continue;
1777                 }
1778                 retries--;
1779
1780         } while (the_result && retries);
1781
1782         if (the_result) {
1783                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1784                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1785                 return -EINVAL;
1786         }
1787
1788         sector_size = get_unaligned_be32(&buffer[8]);
1789         lba = get_unaligned_be64(&buffer[0]);
1790
1791         sd_read_protection_type(sdkp, buffer);
1792
1793         if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1794                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1795                         "kernel compiled with support for large block "
1796                         "devices.\n");
1797                 sdkp->capacity = 0;
1798                 return -EOVERFLOW;
1799         }
1800
1801         /* Logical blocks per physical block exponent */
1802         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1803
1804         /* Lowest aligned logical block */
1805         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1806         blk_queue_alignment_offset(sdp->request_queue, alignment);
1807         if (alignment && sdkp->first_scan)
1808                 sd_printk(KERN_NOTICE, sdkp,
1809                           "physical block alignment offset: %u\n", alignment);
1810
1811         if (buffer[14] & 0x80) { /* LBPME */
1812                 sdkp->lbpme = 1;
1813
1814                 if (buffer[14] & 0x40) /* LBPRZ */
1815                         sdkp->lbprz = 1;
1816
1817                 sd_config_discard(sdkp, SD_LBP_WS16);
1818         }
1819
1820         sdkp->capacity = lba + 1;
1821         return sector_size;
1822 }
1823
1824 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1825                                                 unsigned char *buffer)
1826 {
1827         unsigned char cmd[16];
1828         struct scsi_sense_hdr sshdr;
1829         int sense_valid = 0;
1830         int the_result;
1831         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1832         sector_t lba;
1833         unsigned sector_size;
1834
1835         do {
1836                 cmd[0] = READ_CAPACITY;
1837                 memset(&cmd[1], 0, 9);
1838                 memset(buffer, 0, 8);
1839
1840                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1841                                         buffer, 8, &sshdr,
1842                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1843
1844                 if (media_not_present(sdkp, &sshdr))
1845                         return -ENODEV;
1846
1847                 if (the_result) {
1848                         sense_valid = scsi_sense_valid(&sshdr);
1849                         if (sense_valid &&
1850                             sshdr.sense_key == UNIT_ATTENTION &&
1851                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1852                                 /* Device reset might occur several times,
1853                                  * give it one more chance */
1854                                 if (--reset_retries > 0)
1855                                         continue;
1856                 }
1857                 retries--;
1858
1859         } while (the_result && retries);
1860
1861         if (the_result) {
1862                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1863                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1864                 return -EINVAL;
1865         }
1866
1867         sector_size = get_unaligned_be32(&buffer[4]);
1868         lba = get_unaligned_be32(&buffer[0]);
1869
1870         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1871                 /* Some buggy (usb cardreader) devices return an lba of
1872                    0xffffffff when the want to report a size of 0 (with
1873                    which they really mean no media is present) */
1874                 sdkp->capacity = 0;
1875                 sdkp->physical_block_size = sector_size;
1876                 return sector_size;
1877         }
1878
1879         if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1880                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1881                         "kernel compiled with support for large block "
1882                         "devices.\n");
1883                 sdkp->capacity = 0;
1884                 return -EOVERFLOW;
1885         }
1886
1887         sdkp->capacity = lba + 1;
1888         sdkp->physical_block_size = sector_size;
1889         return sector_size;
1890 }
1891
1892 static int sd_try_rc16_first(struct scsi_device *sdp)
1893 {
1894         if (sdp->host->max_cmd_len < 16)
1895                 return 0;
1896         if (sdp->scsi_level > SCSI_SPC_2)
1897                 return 1;
1898         if (scsi_device_protection(sdp))
1899                 return 1;
1900         return 0;
1901 }
1902
1903 /*
1904  * read disk capacity
1905  */
1906 static void
1907 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1908 {
1909         int sector_size;
1910         struct scsi_device *sdp = sdkp->device;
1911         sector_t old_capacity = sdkp->capacity;
1912
1913         if (sd_try_rc16_first(sdp)) {
1914                 sector_size = read_capacity_16(sdkp, sdp, buffer);
1915                 if (sector_size == -EOVERFLOW)
1916                         goto got_data;
1917                 if (sector_size == -ENODEV)
1918                         return;
1919                 if (sector_size < 0)
1920                         sector_size = read_capacity_10(sdkp, sdp, buffer);
1921                 if (sector_size < 0)
1922                         return;
1923         } else {
1924                 sector_size = read_capacity_10(sdkp, sdp, buffer);
1925                 if (sector_size == -EOVERFLOW)
1926                         goto got_data;
1927                 if (sector_size < 0)
1928                         return;
1929                 if ((sizeof(sdkp->capacity) > 4) &&
1930                     (sdkp->capacity > 0xffffffffULL)) {
1931                         int old_sector_size = sector_size;
1932                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1933                                         "Trying to use READ CAPACITY(16).\n");
1934                         sector_size = read_capacity_16(sdkp, sdp, buffer);
1935                         if (sector_size < 0) {
1936                                 sd_printk(KERN_NOTICE, sdkp,
1937                                         "Using 0xffffffff as device size\n");
1938                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1939                                 sector_size = old_sector_size;
1940                                 goto got_data;
1941                         }
1942                 }
1943         }
1944
1945         /* Some devices are known to return the total number of blocks,
1946          * not the highest block number.  Some devices have versions
1947          * which do this and others which do not.  Some devices we might
1948          * suspect of doing this but we don't know for certain.
1949          *
1950          * If we know the reported capacity is wrong, decrement it.  If
1951          * we can only guess, then assume the number of blocks is even
1952          * (usually true but not always) and err on the side of lowering
1953          * the capacity.
1954          */
1955         if (sdp->fix_capacity ||
1956             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1957                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1958                                 "from its reported value: %llu\n",
1959                                 (unsigned long long) sdkp->capacity);
1960                 --sdkp->capacity;
1961         }
1962
1963 got_data:
1964         if (sector_size == 0) {
1965                 sector_size = 512;
1966                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1967                           "assuming 512.\n");
1968         }
1969
1970         if (sector_size != 512 &&
1971             sector_size != 1024 &&
1972             sector_size != 2048 &&
1973             sector_size != 4096 &&
1974             sector_size != 256) {
1975                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1976                           sector_size);
1977                 /*
1978                  * The user might want to re-format the drive with
1979                  * a supported sectorsize.  Once this happens, it
1980                  * would be relatively trivial to set the thing up.
1981                  * For this reason, we leave the thing in the table.
1982                  */
1983                 sdkp->capacity = 0;
1984                 /*
1985                  * set a bogus sector size so the normal read/write
1986                  * logic in the block layer will eventually refuse any
1987                  * request on this device without tripping over power
1988                  * of two sector size assumptions
1989                  */
1990                 sector_size = 512;
1991         }
1992         blk_queue_logical_block_size(sdp->request_queue, sector_size);
1993
1994         {
1995                 char cap_str_2[10], cap_str_10[10];
1996                 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1997
1998                 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1999                                 sizeof(cap_str_2));
2000                 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2001                                 sizeof(cap_str_10));
2002
2003                 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2004                         sd_printk(KERN_NOTICE, sdkp,
2005                                   "%llu %d-byte logical blocks: (%s/%s)\n",
2006                                   (unsigned long long)sdkp->capacity,
2007                                   sector_size, cap_str_10, cap_str_2);
2008
2009                         if (sdkp->physical_block_size != sector_size)
2010                                 sd_printk(KERN_NOTICE, sdkp,
2011                                           "%u-byte physical blocks\n",
2012                                           sdkp->physical_block_size);
2013                 }
2014         }
2015
2016         /* Rescale capacity to 512-byte units */
2017         if (sector_size == 4096)
2018                 sdkp->capacity <<= 3;
2019         else if (sector_size == 2048)
2020                 sdkp->capacity <<= 2;
2021         else if (sector_size == 1024)
2022                 sdkp->capacity <<= 1;
2023         else if (sector_size == 256)
2024                 sdkp->capacity >>= 1;
2025
2026         blk_queue_physical_block_size(sdp->request_queue,
2027                                       sdkp->physical_block_size);
2028         sdkp->device->sector_size = sector_size;
2029 }
2030
2031 /* called with buffer of length 512 */
2032 static inline int
2033 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2034                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2035                  struct scsi_sense_hdr *sshdr)
2036 {
2037         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2038                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2039                                sshdr);
2040 }
2041
2042 /*
2043  * read write protect setting, if possible - called only in sd_revalidate_disk()
2044  * called with buffer of length SD_BUF_SIZE
2045  */
2046 static void
2047 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2048 {
2049         int res;
2050         struct scsi_device *sdp = sdkp->device;
2051         struct scsi_mode_data data;
2052         int old_wp = sdkp->write_prot;
2053
2054         set_disk_ro(sdkp->disk, 0);
2055         if (sdp->skip_ms_page_3f) {
2056                 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2057                 return;
2058         }
2059
2060         if (sdp->use_192_bytes_for_3f) {
2061                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2062         } else {
2063                 /*
2064                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2065                  * We have to start carefully: some devices hang if we ask
2066                  * for more than is available.
2067                  */
2068                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2069
2070                 /*
2071                  * Second attempt: ask for page 0 When only page 0 is
2072                  * implemented, a request for page 3F may return Sense Key
2073                  * 5: Illegal Request, Sense Code 24: Invalid field in
2074                  * CDB.
2075                  */
2076                 if (!scsi_status_is_good(res))
2077                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2078
2079                 /*
2080                  * Third attempt: ask 255 bytes, as we did earlier.
2081                  */
2082                 if (!scsi_status_is_good(res))
2083                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2084                                                &data, NULL);
2085         }
2086
2087         if (!scsi_status_is_good(res)) {
2088                 sd_printk(KERN_WARNING, sdkp,
2089                           "Test WP failed, assume Write Enabled\n");
2090         } else {
2091                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2092                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2093                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2094                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2095                                   sdkp->write_prot ? "on" : "off");
2096                         sd_printk(KERN_DEBUG, sdkp,
2097                                   "Mode Sense: %02x %02x %02x %02x\n",
2098                                   buffer[0], buffer[1], buffer[2], buffer[3]);
2099                 }
2100         }
2101 }
2102
2103 /*
2104  * sd_read_cache_type - called only from sd_revalidate_disk()
2105  * called with buffer of length SD_BUF_SIZE
2106  */
2107 static void
2108 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2109 {
2110         int len = 0, res;
2111         struct scsi_device *sdp = sdkp->device;
2112
2113         int dbd;
2114         int modepage;
2115         int first_len;
2116         struct scsi_mode_data data;
2117         struct scsi_sense_hdr sshdr;
2118         int old_wce = sdkp->WCE;
2119         int old_rcd = sdkp->RCD;
2120         int old_dpofua = sdkp->DPOFUA;
2121
2122         first_len = 4;
2123         if (sdp->skip_ms_page_8) {
2124                 if (sdp->type == TYPE_RBC)
2125                         goto defaults;
2126                 else {
2127                         if (sdp->skip_ms_page_3f)
2128                                 goto defaults;
2129                         modepage = 0x3F;
2130                         if (sdp->use_192_bytes_for_3f)
2131                                 first_len = 192;
2132                         dbd = 0;
2133                 }
2134         } else if (sdp->type == TYPE_RBC) {
2135                 modepage = 6;
2136                 dbd = 8;
2137         } else {
2138                 modepage = 8;
2139                 dbd = 0;
2140         }
2141
2142         /* cautiously ask */
2143         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2144                         &data, &sshdr);
2145
2146         if (!scsi_status_is_good(res))
2147                 goto bad_sense;
2148
2149         if (!data.header_length) {
2150                 modepage = 6;
2151                 first_len = 0;
2152                 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2153         }
2154
2155         /* that went OK, now ask for the proper length */
2156         len = data.length;
2157
2158         /*
2159          * We're only interested in the first three bytes, actually.
2160          * But the data cache page is defined for the first 20.
2161          */
2162         if (len < 3)
2163                 goto bad_sense;
2164         else if (len > SD_BUF_SIZE) {
2165                 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2166                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2167                 len = SD_BUF_SIZE;
2168         }
2169         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2170                 len = 192;
2171
2172         /* Get the data */
2173         if (len > first_len)
2174                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2175                                 &data, &sshdr);
2176
2177         if (scsi_status_is_good(res)) {
2178                 int offset = data.header_length + data.block_descriptor_length;
2179
2180                 while (offset < len) {
2181                         u8 page_code = buffer[offset] & 0x3F;
2182                         u8 spf       = buffer[offset] & 0x40;
2183
2184                         if (page_code == 8 || page_code == 6) {
2185                                 /* We're interested only in the first 3 bytes.
2186                                  */
2187                                 if (len - offset <= 2) {
2188                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2189                                                   "mode parameter data\n");
2190                                         goto defaults;
2191                                 } else {
2192                                         modepage = page_code;
2193                                         goto Page_found;
2194                                 }
2195                         } else {
2196                                 /* Go to the next page */
2197                                 if (spf && len - offset > 3)
2198                                         offset += 4 + (buffer[offset+2] << 8) +
2199                                                 buffer[offset+3];
2200                                 else if (!spf && len - offset > 1)
2201                                         offset += 2 + buffer[offset+1];
2202                                 else {
2203                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2204                                                   "mode parameter data\n");
2205                                         goto defaults;
2206                                 }
2207                         }
2208                 }
2209
2210                 if (modepage == 0x3F) {
2211                         sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2212                                   "present\n");
2213                         goto defaults;
2214                 } else if ((buffer[offset] & 0x3f) != modepage) {
2215                         sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2216                         goto defaults;
2217                 }
2218         Page_found:
2219                 if (modepage == 8) {
2220                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2221                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2222                 } else {
2223                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2224                         sdkp->RCD = 0;
2225                 }
2226
2227                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2228                 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2229                         sd_printk(KERN_NOTICE, sdkp,
2230                                   "Uses READ/WRITE(6), disabling FUA\n");
2231                         sdkp->DPOFUA = 0;
2232                 }
2233
2234                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2235                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2236                         sd_printk(KERN_NOTICE, sdkp,
2237                                   "Write cache: %s, read cache: %s, %s\n",
2238                                   sdkp->WCE ? "enabled" : "disabled",
2239                                   sdkp->RCD ? "disabled" : "enabled",
2240                                   sdkp->DPOFUA ? "supports DPO and FUA"
2241                                   : "doesn't support DPO or FUA");
2242
2243                 return;
2244         }
2245
2246 bad_sense:
2247         if (scsi_sense_valid(&sshdr) &&
2248             sshdr.sense_key == ILLEGAL_REQUEST &&
2249             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2250                 /* Invalid field in CDB */
2251                 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2252         else
2253                 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2254
2255 defaults:
2256         sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2257         sdkp->WCE = 0;
2258         sdkp->RCD = 0;
2259         sdkp->DPOFUA = 0;
2260 }
2261
2262 /*
2263  * The ATO bit indicates whether the DIF application tag is available
2264  * for use by the operating system.
2265  */
2266 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2267 {
2268         int res, offset;
2269         struct scsi_device *sdp = sdkp->device;
2270         struct scsi_mode_data data;
2271         struct scsi_sense_hdr sshdr;
2272
2273         if (sdp->type != TYPE_DISK)
2274                 return;
2275
2276         if (sdkp->protection_type == 0)
2277                 return;
2278
2279         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2280                               SD_MAX_RETRIES, &data, &sshdr);
2281
2282         if (!scsi_status_is_good(res) || !data.header_length ||
2283             data.length < 6) {
2284                 sd_printk(KERN_WARNING, sdkp,
2285                           "getting Control mode page failed, assume no ATO\n");
2286
2287                 if (scsi_sense_valid(&sshdr))
2288                         sd_print_sense_hdr(sdkp, &sshdr);
2289
2290                 return;
2291         }
2292
2293         offset = data.header_length + data.block_descriptor_length;
2294
2295         if ((buffer[offset] & 0x3f) != 0x0a) {
2296                 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2297                 return;
2298         }
2299
2300         if ((buffer[offset + 5] & 0x80) == 0)
2301                 return;
2302
2303         sdkp->ATO = 1;
2304
2305         return;
2306 }
2307
2308 /**
2309  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2310  * @disk: disk to query
2311  */
2312 static void sd_read_block_limits(struct scsi_disk *sdkp)
2313 {
2314         unsigned int sector_sz = sdkp->device->sector_size;
2315         const int vpd_len = 64;
2316         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2317
2318         if (!buffer ||
2319             /* Block Limits VPD */
2320             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2321                 goto out;
2322
2323         blk_queue_io_min(sdkp->disk->queue,
2324                          get_unaligned_be16(&buffer[6]) * sector_sz);
2325         blk_queue_io_opt(sdkp->disk->queue,
2326                          get_unaligned_be32(&buffer[12]) * sector_sz);
2327
2328         if (buffer[3] == 0x3c) {
2329                 unsigned int lba_count, desc_count;
2330
2331                 sdkp->max_ws_blocks =
2332                         (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2333                                            (u64)0xffffffff);
2334
2335                 if (!sdkp->lbpme)
2336                         goto out;
2337
2338                 lba_count = get_unaligned_be32(&buffer[20]);
2339                 desc_count = get_unaligned_be32(&buffer[24]);
2340
2341                 if (lba_count && desc_count)
2342                         sdkp->max_unmap_blocks = lba_count;
2343
2344                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2345
2346                 if (buffer[32] & 0x80)
2347                         sdkp->unmap_alignment =
2348                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2349
2350                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2351
2352                         if (sdkp->max_unmap_blocks)
2353                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2354                         else
2355                                 sd_config_discard(sdkp, SD_LBP_WS16);
2356
2357                 } else {        /* LBP VPD page tells us what to use */
2358
2359                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2360                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2361                         else if (sdkp->lbpws)
2362                                 sd_config_discard(sdkp, SD_LBP_WS16);
2363                         else if (sdkp->lbpws10)
2364                                 sd_config_discard(sdkp, SD_LBP_WS10);
2365                         else
2366                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2367                 }
2368         }
2369
2370  out:
2371         kfree(buffer);
2372 }
2373
2374 /**
2375  * sd_read_block_characteristics - Query block dev. characteristics
2376  * @disk: disk to query
2377  */
2378 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2379 {
2380         unsigned char *buffer;
2381         u16 rot;
2382         const int vpd_len = 64;
2383
2384         buffer = kmalloc(vpd_len, GFP_KERNEL);
2385
2386         if (!buffer ||
2387             /* Block Device Characteristics VPD */
2388             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2389                 goto out;
2390
2391         rot = get_unaligned_be16(&buffer[4]);
2392
2393         if (rot == 1)
2394                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2395
2396  out:
2397         kfree(buffer);
2398 }
2399
2400 /**
2401  * sd_read_block_provisioning - Query provisioning VPD page
2402  * @disk: disk to query
2403  */
2404 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2405 {
2406         unsigned char *buffer;
2407         const int vpd_len = 8;
2408
2409         if (sdkp->lbpme == 0)
2410                 return;
2411
2412         buffer = kmalloc(vpd_len, GFP_KERNEL);
2413
2414         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2415                 goto out;
2416
2417         sdkp->lbpvpd    = 1;
2418         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2419         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2420         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2421
2422  out:
2423         kfree(buffer);
2424 }
2425
2426 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2427 {
2428         /*
2429          * Although VPD inquiries can go to SCSI-2 type devices,
2430          * some USB ones crash on receiving them, and the pages
2431          * we currently ask for are for SPC-3 and beyond
2432          */
2433         if (sdp->scsi_level > SCSI_SPC_2)
2434                 return 1;
2435         return 0;
2436 }
2437
2438 /**
2439  *      sd_revalidate_disk - called the first time a new disk is seen,
2440  *      performs disk spin up, read_capacity, etc.
2441  *      @disk: struct gendisk we care about
2442  **/
2443 static int sd_revalidate_disk(struct gendisk *disk)
2444 {
2445         struct scsi_disk *sdkp = scsi_disk(disk);
2446         struct scsi_device *sdp = sdkp->device;
2447         unsigned char *buffer;
2448         unsigned flush = 0;
2449
2450         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2451                                       "sd_revalidate_disk\n"));
2452
2453         /*
2454          * If the device is offline, don't try and read capacity or any
2455          * of the other niceties.
2456          */
2457         if (!scsi_device_online(sdp))
2458                 goto out;
2459
2460         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2461         if (!buffer) {
2462                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2463                           "allocation failure.\n");
2464                 goto out;
2465         }
2466
2467         sd_spinup_disk(sdkp);
2468
2469         /*
2470          * Without media there is no reason to ask; moreover, some devices
2471          * react badly if we do.
2472          */
2473         if (sdkp->media_present) {
2474                 sd_read_capacity(sdkp, buffer);
2475
2476                 if (sd_try_extended_inquiry(sdp)) {
2477                         sd_read_block_provisioning(sdkp);
2478                         sd_read_block_limits(sdkp);
2479                         sd_read_block_characteristics(sdkp);
2480                 }
2481
2482                 sd_read_write_protect_flag(sdkp, buffer);
2483                 sd_read_cache_type(sdkp, buffer);
2484                 sd_read_app_tag_own(sdkp, buffer);
2485         }
2486
2487         sdkp->first_scan = 0;
2488
2489         /*
2490          * We now have all cache related info, determine how we deal
2491          * with flush requests.
2492          */
2493         if (sdkp->WCE) {
2494                 flush |= REQ_FLUSH;
2495                 if (sdkp->DPOFUA)
2496                         flush |= REQ_FUA;
2497         }
2498
2499         blk_queue_flush(sdkp->disk->queue, flush);
2500
2501         set_capacity(disk, sdkp->capacity);
2502         kfree(buffer);
2503
2504  out:
2505         return 0;
2506 }
2507
2508 /**
2509  *      sd_unlock_native_capacity - unlock native capacity
2510  *      @disk: struct gendisk to set capacity for
2511  *
2512  *      Block layer calls this function if it detects that partitions
2513  *      on @disk reach beyond the end of the device.  If the SCSI host
2514  *      implements ->unlock_native_capacity() method, it's invoked to
2515  *      give it a chance to adjust the device capacity.
2516  *
2517  *      CONTEXT:
2518  *      Defined by block layer.  Might sleep.
2519  */
2520 static void sd_unlock_native_capacity(struct gendisk *disk)
2521 {
2522         struct scsi_device *sdev = scsi_disk(disk)->device;
2523
2524         if (sdev->host->hostt->unlock_native_capacity)
2525                 sdev->host->hostt->unlock_native_capacity(sdev);
2526 }
2527
2528 /**
2529  *      sd_format_disk_name - format disk name
2530  *      @prefix: name prefix - ie. "sd" for SCSI disks
2531  *      @index: index of the disk to format name for
2532  *      @buf: output buffer
2533  *      @buflen: length of the output buffer
2534  *
2535  *      SCSI disk names starts at sda.  The 26th device is sdz and the
2536  *      27th is sdaa.  The last one for two lettered suffix is sdzz
2537  *      which is followed by sdaaa.
2538  *
2539  *      This is basically 26 base counting with one extra 'nil' entry
2540  *      at the beginning from the second digit on and can be
2541  *      determined using similar method as 26 base conversion with the
2542  *      index shifted -1 after each digit is computed.
2543  *
2544  *      CONTEXT:
2545  *      Don't care.
2546  *
2547  *      RETURNS:
2548  *      0 on success, -errno on failure.
2549  */
2550 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2551 {
2552         const int base = 'z' - 'a' + 1;
2553         char *begin = buf + strlen(prefix);
2554         char *end = buf + buflen;
2555         char *p;
2556         int unit;
2557
2558         p = end - 1;
2559         *p = '\0';
2560         unit = base;
2561         do {
2562                 if (p == begin)
2563                         return -EINVAL;
2564                 *--p = 'a' + (index % unit);
2565                 index = (index / unit) - 1;
2566         } while (index >= 0);
2567
2568         memmove(begin, p, end - p);
2569         memcpy(buf, prefix, strlen(prefix));
2570
2571         return 0;
2572 }
2573
2574 /*
2575  * The asynchronous part of sd_probe
2576  */
2577 static void sd_probe_async(void *data, async_cookie_t cookie)
2578 {
2579         struct scsi_disk *sdkp = data;
2580         struct scsi_device *sdp;
2581         struct gendisk *gd;
2582         u32 index;
2583         struct device *dev;
2584
2585         sdp = sdkp->device;
2586         gd = sdkp->disk;
2587         index = sdkp->index;
2588         dev = &sdp->sdev_gendev;
2589
2590         gd->major = sd_major((index & 0xf0) >> 4);
2591         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2592         gd->minors = SD_MINORS;
2593
2594         gd->fops = &sd_fops;
2595         gd->private_data = &sdkp->driver;
2596         gd->queue = sdkp->device->request_queue;
2597
2598         /* defaults, until the device tells us otherwise */
2599         sdp->sector_size = 512;
2600         sdkp->capacity = 0;
2601         sdkp->media_present = 1;
2602         sdkp->write_prot = 0;
2603         sdkp->WCE = 0;
2604         sdkp->RCD = 0;
2605         sdkp->ATO = 0;
2606         sdkp->first_scan = 1;
2607         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2608
2609         sd_revalidate_disk(gd);
2610
2611         blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2612         blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2613
2614         gd->driverfs_dev = &sdp->sdev_gendev;
2615         gd->flags = GENHD_FL_EXT_DEVT;
2616         if (sdp->removable) {
2617                 gd->flags |= GENHD_FL_REMOVABLE;
2618                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2619         }
2620
2621         add_disk(gd);
2622         sd_dif_config_host(sdkp);
2623
2624         sd_revalidate_disk(gd);
2625
2626         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2627                   sdp->removable ? "removable " : "");
2628         scsi_autopm_put_device(sdp);
2629         put_device(&sdkp->dev);
2630 }
2631
2632 /**
2633  *      sd_probe - called during driver initialization and whenever a
2634  *      new scsi device is attached to the system. It is called once
2635  *      for each scsi device (not just disks) present.
2636  *      @dev: pointer to device object
2637  *
2638  *      Returns 0 if successful (or not interested in this scsi device 
2639  *      (e.g. scanner)); 1 when there is an error.
2640  *
2641  *      Note: this function is invoked from the scsi mid-level.
2642  *      This function sets up the mapping between a given 
2643  *      <host,channel,id,lun> (found in sdp) and new device name 
2644  *      (e.g. /dev/sda). More precisely it is the block device major 
2645  *      and minor number that is chosen here.
2646  *
2647  *      Assume sd_attach is not re-entrant (for time being)
2648  *      Also think about sd_attach() and sd_remove() running coincidentally.
2649  **/
2650 static int sd_probe(struct device *dev)
2651 {
2652         struct scsi_device *sdp = to_scsi_device(dev);
2653         struct scsi_disk *sdkp;
2654         struct gendisk *gd;
2655         int index;
2656         int error;
2657
2658         error = -ENODEV;
2659         if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2660                 goto out;
2661
2662         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2663                                         "sd_attach\n"));
2664
2665         error = -ENOMEM;
2666         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2667         if (!sdkp)
2668                 goto out;
2669
2670         gd = alloc_disk(SD_MINORS);
2671         if (!gd)
2672                 goto out_free;
2673
2674         do {
2675                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2676                         goto out_put;
2677
2678                 spin_lock(&sd_index_lock);
2679                 error = ida_get_new(&sd_index_ida, &index);
2680                 spin_unlock(&sd_index_lock);
2681         } while (error == -EAGAIN);
2682
2683         if (error) {
2684                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2685                 goto out_put;
2686         }
2687
2688         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2689         if (error) {
2690                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2691                 goto out_free_index;
2692         }
2693
2694         sdkp->device = sdp;
2695         sdkp->driver = &sd_template;
2696         sdkp->disk = gd;
2697         sdkp->index = index;
2698         atomic_set(&sdkp->openers, 0);
2699
2700         if (!sdp->request_queue->rq_timeout) {
2701                 if (sdp->type != TYPE_MOD)
2702                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2703                 else
2704                         blk_queue_rq_timeout(sdp->request_queue,
2705                                              SD_MOD_TIMEOUT);
2706         }
2707
2708         device_initialize(&sdkp->dev);
2709         sdkp->dev.parent = dev;
2710         sdkp->dev.class = &sd_disk_class;
2711         dev_set_name(&sdkp->dev, dev_name(dev));
2712
2713         if (device_add(&sdkp->dev))
2714                 goto out_free_index;
2715
2716         get_device(dev);
2717         dev_set_drvdata(dev, sdkp);
2718
2719         get_device(&sdkp->dev); /* prevent release before async_schedule */
2720         async_schedule(sd_probe_async, sdkp);
2721
2722         return 0;
2723
2724  out_free_index:
2725         spin_lock(&sd_index_lock);
2726         ida_remove(&sd_index_ida, index);
2727         spin_unlock(&sd_index_lock);
2728  out_put:
2729         put_disk(gd);
2730  out_free:
2731         kfree(sdkp);
2732  out:
2733         return error;
2734 }
2735
2736 /**
2737  *      sd_remove - called whenever a scsi disk (previously recognized by
2738  *      sd_probe) is detached from the system. It is called (potentially
2739  *      multiple times) during sd module unload.
2740  *      @sdp: pointer to mid level scsi device object
2741  *
2742  *      Note: this function is invoked from the scsi mid-level.
2743  *      This function potentially frees up a device name (e.g. /dev/sdc)
2744  *      that could be re-used by a subsequent sd_probe().
2745  *      This function is not called when the built-in sd driver is "exit-ed".
2746  **/
2747 static int sd_remove(struct device *dev)
2748 {
2749         struct scsi_disk *sdkp;
2750
2751         sdkp = dev_get_drvdata(dev);
2752         scsi_autopm_get_device(sdkp->device);
2753
2754         async_synchronize_full();
2755         blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2756         blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2757         device_del(&sdkp->dev);
2758         del_gendisk(sdkp->disk);
2759         sd_shutdown(dev);
2760
2761         mutex_lock(&sd_ref_mutex);
2762         dev_set_drvdata(dev, NULL);
2763         put_device(&sdkp->dev);
2764         mutex_unlock(&sd_ref_mutex);
2765
2766         return 0;
2767 }
2768
2769 /**
2770  *      scsi_disk_release - Called to free the scsi_disk structure
2771  *      @dev: pointer to embedded class device
2772  *
2773  *      sd_ref_mutex must be held entering this routine.  Because it is
2774  *      called on last put, you should always use the scsi_disk_get()
2775  *      scsi_disk_put() helpers which manipulate the semaphore directly
2776  *      and never do a direct put_device.
2777  **/
2778 static void scsi_disk_release(struct device *dev)
2779 {
2780         struct scsi_disk *sdkp = to_scsi_disk(dev);
2781         struct gendisk *disk = sdkp->disk;
2782         
2783         spin_lock(&sd_index_lock);
2784         ida_remove(&sd_index_ida, sdkp->index);
2785         spin_unlock(&sd_index_lock);
2786
2787         disk->private_data = NULL;
2788         put_disk(disk);
2789         put_device(&sdkp->device->sdev_gendev);
2790
2791         kfree(sdkp);
2792 }
2793
2794 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2795 {
2796         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
2797         struct scsi_sense_hdr sshdr;
2798         struct scsi_device *sdp = sdkp->device;
2799         int res;
2800
2801         if (start)
2802                 cmd[4] |= 1;    /* START */
2803
2804         if (sdp->start_stop_pwr_cond)
2805                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
2806
2807         if (!scsi_device_online(sdp))
2808                 return -ENODEV;
2809
2810         res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2811                                SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2812         if (res) {
2813                 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2814                 sd_print_result(sdkp, res);
2815                 if (driver_byte(res) & DRIVER_SENSE)
2816                         sd_print_sense_hdr(sdkp, &sshdr);
2817         }
2818
2819         return res;
2820 }
2821
2822 /*
2823  * Send a SYNCHRONIZE CACHE instruction down to the device through
2824  * the normal SCSI command structure.  Wait for the command to
2825  * complete.
2826  */
2827 static void sd_shutdown(struct device *dev)
2828 {
2829         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2830
2831         if (!sdkp)
2832                 return;         /* this can happen */
2833
2834         if (pm_runtime_suspended(dev))
2835                 goto exit;
2836
2837         if (sdkp->WCE) {
2838                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2839                 sd_sync_cache(sdkp);
2840         }
2841
2842         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2843                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2844                 sd_start_stop_device(sdkp, 0);
2845         }
2846
2847 exit:
2848         scsi_disk_put(sdkp);
2849 }
2850
2851 static int sd_suspend(struct device *dev, pm_message_t mesg)
2852 {
2853         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2854         int ret = 0;
2855
2856         if (!sdkp)
2857                 return 0;       /* this can happen */
2858
2859         if (sdkp->WCE) {
2860                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2861                 ret = sd_sync_cache(sdkp);
2862                 if (ret)
2863                         goto done;
2864         }
2865
2866         if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2867                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2868                 ret = sd_start_stop_device(sdkp, 0);
2869         }
2870
2871 done:
2872         scsi_disk_put(sdkp);
2873         return ret;
2874 }
2875
2876 static int sd_resume(struct device *dev)
2877 {
2878         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2879         int ret = 0;
2880
2881         if (!sdkp->device->manage_start_stop)
2882                 goto done;
2883
2884         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2885         ret = sd_start_stop_device(sdkp, 1);
2886
2887 done:
2888         scsi_disk_put(sdkp);
2889         return ret;
2890 }
2891
2892 /**
2893  *      init_sd - entry point for this driver (both when built in or when
2894  *      a module).
2895  *
2896  *      Note: this function registers this driver with the scsi mid-level.
2897  **/
2898 static int __init init_sd(void)
2899 {
2900         int majors = 0, i, err;
2901
2902         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2903
2904         for (i = 0; i < SD_MAJORS; i++)
2905                 if (register_blkdev(sd_major(i), "sd") == 0)
2906                         majors++;
2907
2908         if (!majors)
2909                 return -ENODEV;
2910
2911         err = class_register(&sd_disk_class);
2912         if (err)
2913                 goto err_out;
2914
2915         err = scsi_register_driver(&sd_template.gendrv);
2916         if (err)
2917                 goto err_out_class;
2918
2919         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2920                                          0, 0, NULL);
2921         if (!sd_cdb_cache) {
2922                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2923                 goto err_out_class;
2924         }
2925
2926         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2927         if (!sd_cdb_pool) {
2928                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2929                 goto err_out_cache;
2930         }
2931
2932         return 0;
2933
2934 err_out_cache:
2935         kmem_cache_destroy(sd_cdb_cache);
2936
2937 err_out_class:
2938         class_unregister(&sd_disk_class);
2939 err_out:
2940         for (i = 0; i < SD_MAJORS; i++)
2941                 unregister_blkdev(sd_major(i), "sd");
2942         return err;
2943 }
2944
2945 /**
2946  *      exit_sd - exit point for this driver (when it is a module).
2947  *
2948  *      Note: this function unregisters this driver from the scsi mid-level.
2949  **/
2950 static void __exit exit_sd(void)
2951 {
2952         int i;
2953
2954         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2955
2956         mempool_destroy(sd_cdb_pool);
2957         kmem_cache_destroy(sd_cdb_cache);
2958
2959         scsi_unregister_driver(&sd_template.gendrv);
2960         class_unregister(&sd_disk_class);
2961
2962         for (i = 0; i < SD_MAJORS; i++)
2963                 unregister_blkdev(sd_major(i), "sd");
2964 }
2965
2966 module_init(init_sd);
2967 module_exit(exit_sd);
2968
2969 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2970                                struct scsi_sense_hdr *sshdr)
2971 {
2972         sd_printk(KERN_INFO, sdkp, " ");
2973         scsi_show_sense_hdr(sshdr);
2974         sd_printk(KERN_INFO, sdkp, " ");
2975         scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2976 }
2977
2978 static void sd_print_result(struct scsi_disk *sdkp, int result)
2979 {
2980         sd_printk(KERN_INFO, sdkp, " ");
2981         scsi_show_result(result);
2982 }
2983