ASoC: Use card field to indicate whether a component is bound
[linux-2.6-block.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_priv.h"
69 #include "scsi_logging.h"
70
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
74
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS       16
97 #else
98 #define SD_MINORS       0
99 #endif
100
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int  sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int  sd_probe(struct device *);
106 static int  sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend_system(struct device *);
109 static int sd_suspend_runtime(struct device *);
110 static int sd_resume(struct device *);
111 static void sd_rescan(struct device *);
112 static int sd_init_command(struct scsi_cmnd *SCpnt);
113 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
114 static int sd_done(struct scsi_cmnd *);
115 static int sd_eh_action(struct scsi_cmnd *, int);
116 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
117 static void scsi_disk_release(struct device *cdev);
118 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
119 static void sd_print_result(const struct scsi_disk *, const char *, int);
120
121 static DEFINE_SPINLOCK(sd_index_lock);
122 static DEFINE_IDA(sd_index_ida);
123
124 /* This semaphore is used to mediate the 0->1 reference get in the
125  * face of object destruction (i.e. we can't allow a get on an
126  * object after last put) */
127 static DEFINE_MUTEX(sd_ref_mutex);
128
129 static struct kmem_cache *sd_cdb_cache;
130 static mempool_t *sd_cdb_pool;
131
132 static const char *sd_cache_types[] = {
133         "write through", "none", "write back",
134         "write back, no read (daft)"
135 };
136
137 static void sd_set_flush_flag(struct scsi_disk *sdkp)
138 {
139         unsigned flush = 0;
140
141         if (sdkp->WCE) {
142                 flush |= REQ_FLUSH;
143                 if (sdkp->DPOFUA)
144                         flush |= REQ_FUA;
145         }
146
147         blk_queue_flush(sdkp->disk->queue, flush);
148 }
149
150 static ssize_t
151 cache_type_store(struct device *dev, struct device_attribute *attr,
152                  const char *buf, size_t count)
153 {
154         int i, ct = -1, rcd, wce, sp;
155         struct scsi_disk *sdkp = to_scsi_disk(dev);
156         struct scsi_device *sdp = sdkp->device;
157         char buffer[64];
158         char *buffer_data;
159         struct scsi_mode_data data;
160         struct scsi_sense_hdr sshdr;
161         static const char temp[] = "temporary ";
162         int len;
163
164         if (sdp->type != TYPE_DISK)
165                 /* no cache control on RBC devices; theoretically they
166                  * can do it, but there's probably so many exceptions
167                  * it's not worth the risk */
168                 return -EINVAL;
169
170         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
171                 buf += sizeof(temp) - 1;
172                 sdkp->cache_override = 1;
173         } else {
174                 sdkp->cache_override = 0;
175         }
176
177         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
178                 len = strlen(sd_cache_types[i]);
179                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
180                     buf[len] == '\n') {
181                         ct = i;
182                         break;
183                 }
184         }
185         if (ct < 0)
186                 return -EINVAL;
187         rcd = ct & 0x01 ? 1 : 0;
188         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
189
190         if (sdkp->cache_override) {
191                 sdkp->WCE = wce;
192                 sdkp->RCD = rcd;
193                 sd_set_flush_flag(sdkp);
194                 return count;
195         }
196
197         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
198                             SD_MAX_RETRIES, &data, NULL))
199                 return -EINVAL;
200         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
201                   data.block_descriptor_length);
202         buffer_data = buffer + data.header_length +
203                 data.block_descriptor_length;
204         buffer_data[2] &= ~0x05;
205         buffer_data[2] |= wce << 2 | rcd;
206         sp = buffer_data[0] & 0x80 ? 1 : 0;
207
208         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
209                              SD_MAX_RETRIES, &data, &sshdr)) {
210                 if (scsi_sense_valid(&sshdr))
211                         sd_print_sense_hdr(sdkp, &sshdr);
212                 return -EINVAL;
213         }
214         revalidate_disk(sdkp->disk);
215         return count;
216 }
217
218 static ssize_t
219 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
220                        char *buf)
221 {
222         struct scsi_disk *sdkp = to_scsi_disk(dev);
223         struct scsi_device *sdp = sdkp->device;
224
225         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
226 }
227
228 static ssize_t
229 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
230                         const char *buf, size_t count)
231 {
232         struct scsi_disk *sdkp = to_scsi_disk(dev);
233         struct scsi_device *sdp = sdkp->device;
234
235         if (!capable(CAP_SYS_ADMIN))
236                 return -EACCES;
237
238         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
239
240         return count;
241 }
242 static DEVICE_ATTR_RW(manage_start_stop);
243
244 static ssize_t
245 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
246 {
247         struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250 }
251
252 static ssize_t
253 allow_restart_store(struct device *dev, struct device_attribute *attr,
254                     const char *buf, size_t count)
255 {
256         struct scsi_disk *sdkp = to_scsi_disk(dev);
257         struct scsi_device *sdp = sdkp->device;
258
259         if (!capable(CAP_SYS_ADMIN))
260                 return -EACCES;
261
262         if (sdp->type != TYPE_DISK)
263                 return -EINVAL;
264
265         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
266
267         return count;
268 }
269 static DEVICE_ATTR_RW(allow_restart);
270
271 static ssize_t
272 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
273 {
274         struct scsi_disk *sdkp = to_scsi_disk(dev);
275         int ct = sdkp->RCD + 2*sdkp->WCE;
276
277         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
278 }
279 static DEVICE_ATTR_RW(cache_type);
280
281 static ssize_t
282 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
283 {
284         struct scsi_disk *sdkp = to_scsi_disk(dev);
285
286         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
287 }
288 static DEVICE_ATTR_RO(FUA);
289
290 static ssize_t
291 protection_type_show(struct device *dev, struct device_attribute *attr,
292                      char *buf)
293 {
294         struct scsi_disk *sdkp = to_scsi_disk(dev);
295
296         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
297 }
298
299 static ssize_t
300 protection_type_store(struct device *dev, struct device_attribute *attr,
301                       const char *buf, size_t count)
302 {
303         struct scsi_disk *sdkp = to_scsi_disk(dev);
304         unsigned int val;
305         int err;
306
307         if (!capable(CAP_SYS_ADMIN))
308                 return -EACCES;
309
310         err = kstrtouint(buf, 10, &val);
311
312         if (err)
313                 return err;
314
315         if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
316                 sdkp->protection_type = val;
317
318         return count;
319 }
320 static DEVICE_ATTR_RW(protection_type);
321
322 static ssize_t
323 protection_mode_show(struct device *dev, struct device_attribute *attr,
324                      char *buf)
325 {
326         struct scsi_disk *sdkp = to_scsi_disk(dev);
327         struct scsi_device *sdp = sdkp->device;
328         unsigned int dif, dix;
329
330         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
331         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
332
333         if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
334                 dif = 0;
335                 dix = 1;
336         }
337
338         if (!dif && !dix)
339                 return snprintf(buf, 20, "none\n");
340
341         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
342 }
343 static DEVICE_ATTR_RO(protection_mode);
344
345 static ssize_t
346 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
347 {
348         struct scsi_disk *sdkp = to_scsi_disk(dev);
349
350         return snprintf(buf, 20, "%u\n", sdkp->ATO);
351 }
352 static DEVICE_ATTR_RO(app_tag_own);
353
354 static ssize_t
355 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
356                        char *buf)
357 {
358         struct scsi_disk *sdkp = to_scsi_disk(dev);
359
360         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
361 }
362 static DEVICE_ATTR_RO(thin_provisioning);
363
364 static const char *lbp_mode[] = {
365         [SD_LBP_FULL]           = "full",
366         [SD_LBP_UNMAP]          = "unmap",
367         [SD_LBP_WS16]           = "writesame_16",
368         [SD_LBP_WS10]           = "writesame_10",
369         [SD_LBP_ZERO]           = "writesame_zero",
370         [SD_LBP_DISABLE]        = "disabled",
371 };
372
373 static ssize_t
374 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
375                        char *buf)
376 {
377         struct scsi_disk *sdkp = to_scsi_disk(dev);
378
379         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
380 }
381
382 static ssize_t
383 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
384                         const char *buf, size_t count)
385 {
386         struct scsi_disk *sdkp = to_scsi_disk(dev);
387         struct scsi_device *sdp = sdkp->device;
388
389         if (!capable(CAP_SYS_ADMIN))
390                 return -EACCES;
391
392         if (sdp->type != TYPE_DISK)
393                 return -EINVAL;
394
395         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
396                 sd_config_discard(sdkp, SD_LBP_UNMAP);
397         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
398                 sd_config_discard(sdkp, SD_LBP_WS16);
399         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
400                 sd_config_discard(sdkp, SD_LBP_WS10);
401         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
402                 sd_config_discard(sdkp, SD_LBP_ZERO);
403         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
404                 sd_config_discard(sdkp, SD_LBP_DISABLE);
405         else
406                 return -EINVAL;
407
408         return count;
409 }
410 static DEVICE_ATTR_RW(provisioning_mode);
411
412 static ssize_t
413 max_medium_access_timeouts_show(struct device *dev,
414                                 struct device_attribute *attr, char *buf)
415 {
416         struct scsi_disk *sdkp = to_scsi_disk(dev);
417
418         return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
419 }
420
421 static ssize_t
422 max_medium_access_timeouts_store(struct device *dev,
423                                  struct device_attribute *attr, const char *buf,
424                                  size_t count)
425 {
426         struct scsi_disk *sdkp = to_scsi_disk(dev);
427         int err;
428
429         if (!capable(CAP_SYS_ADMIN))
430                 return -EACCES;
431
432         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
433
434         return err ? err : count;
435 }
436 static DEVICE_ATTR_RW(max_medium_access_timeouts);
437
438 static ssize_t
439 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
440                            char *buf)
441 {
442         struct scsi_disk *sdkp = to_scsi_disk(dev);
443
444         return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
445 }
446
447 static ssize_t
448 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
449                             const char *buf, size_t count)
450 {
451         struct scsi_disk *sdkp = to_scsi_disk(dev);
452         struct scsi_device *sdp = sdkp->device;
453         unsigned long max;
454         int err;
455
456         if (!capable(CAP_SYS_ADMIN))
457                 return -EACCES;
458
459         if (sdp->type != TYPE_DISK)
460                 return -EINVAL;
461
462         err = kstrtoul(buf, 10, &max);
463
464         if (err)
465                 return err;
466
467         if (max == 0)
468                 sdp->no_write_same = 1;
469         else if (max <= SD_MAX_WS16_BLOCKS) {
470                 sdp->no_write_same = 0;
471                 sdkp->max_ws_blocks = max;
472         }
473
474         sd_config_write_same(sdkp);
475
476         return count;
477 }
478 static DEVICE_ATTR_RW(max_write_same_blocks);
479
480 static struct attribute *sd_disk_attrs[] = {
481         &dev_attr_cache_type.attr,
482         &dev_attr_FUA.attr,
483         &dev_attr_allow_restart.attr,
484         &dev_attr_manage_start_stop.attr,
485         &dev_attr_protection_type.attr,
486         &dev_attr_protection_mode.attr,
487         &dev_attr_app_tag_own.attr,
488         &dev_attr_thin_provisioning.attr,
489         &dev_attr_provisioning_mode.attr,
490         &dev_attr_max_write_same_blocks.attr,
491         &dev_attr_max_medium_access_timeouts.attr,
492         NULL,
493 };
494 ATTRIBUTE_GROUPS(sd_disk);
495
496 static struct class sd_disk_class = {
497         .name           = "scsi_disk",
498         .owner          = THIS_MODULE,
499         .dev_release    = scsi_disk_release,
500         .dev_groups     = sd_disk_groups,
501 };
502
503 static const struct dev_pm_ops sd_pm_ops = {
504         .suspend                = sd_suspend_system,
505         .resume                 = sd_resume,
506         .poweroff               = sd_suspend_system,
507         .restore                = sd_resume,
508         .runtime_suspend        = sd_suspend_runtime,
509         .runtime_resume         = sd_resume,
510 };
511
512 static struct scsi_driver sd_template = {
513         .gendrv = {
514                 .name           = "sd",
515                 .owner          = THIS_MODULE,
516                 .probe          = sd_probe,
517                 .remove         = sd_remove,
518                 .shutdown       = sd_shutdown,
519                 .pm             = &sd_pm_ops,
520         },
521         .rescan                 = sd_rescan,
522         .init_command           = sd_init_command,
523         .uninit_command         = sd_uninit_command,
524         .done                   = sd_done,
525         .eh_action              = sd_eh_action,
526 };
527
528 /*
529  * Dummy kobj_map->probe function.
530  * The default ->probe function will call modprobe, which is
531  * pointless as this module is already loaded.
532  */
533 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
534 {
535         return NULL;
536 }
537
538 /*
539  * Device no to disk mapping:
540  * 
541  *       major         disc2     disc  p1
542  *   |............|.............|....|....| <- dev_t
543  *    31        20 19          8 7  4 3  0
544  * 
545  * Inside a major, we have 16k disks, however mapped non-
546  * contiguously. The first 16 disks are for major0, the next
547  * ones with major1, ... Disk 256 is for major0 again, disk 272 
548  * for major1, ... 
549  * As we stay compatible with our numbering scheme, we can reuse 
550  * the well-know SCSI majors 8, 65--71, 136--143.
551  */
552 static int sd_major(int major_idx)
553 {
554         switch (major_idx) {
555         case 0:
556                 return SCSI_DISK0_MAJOR;
557         case 1 ... 7:
558                 return SCSI_DISK1_MAJOR + major_idx - 1;
559         case 8 ... 15:
560                 return SCSI_DISK8_MAJOR + major_idx - 8;
561         default:
562                 BUG();
563                 return 0;       /* shut up gcc */
564         }
565 }
566
567 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
568 {
569         struct scsi_disk *sdkp = NULL;
570
571         mutex_lock(&sd_ref_mutex);
572
573         if (disk->private_data) {
574                 sdkp = scsi_disk(disk);
575                 if (scsi_device_get(sdkp->device) == 0)
576                         get_device(&sdkp->dev);
577                 else
578                         sdkp = NULL;
579         }
580         mutex_unlock(&sd_ref_mutex);
581         return sdkp;
582 }
583
584 static void scsi_disk_put(struct scsi_disk *sdkp)
585 {
586         struct scsi_device *sdev = sdkp->device;
587
588         mutex_lock(&sd_ref_mutex);
589         put_device(&sdkp->dev);
590         scsi_device_put(sdev);
591         mutex_unlock(&sd_ref_mutex);
592 }
593
594 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
595                                            unsigned int dix, unsigned int dif)
596 {
597         struct bio *bio = scmd->request->bio;
598         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
599         unsigned int protect = 0;
600
601         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
602                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
603                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
604
605                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
606                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
607         }
608
609         if (dif != SD_DIF_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
610                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
611
612                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
613                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
614         }
615
616         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
617                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
618
619                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
620                         protect = 3 << 5;       /* Disable target PI checking */
621                 else
622                         protect = 1 << 5;       /* Enable target PI checking */
623         }
624
625         scsi_set_prot_op(scmd, prot_op);
626         scsi_set_prot_type(scmd, dif);
627         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
628
629         return protect;
630 }
631
632 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
633 {
634         struct request_queue *q = sdkp->disk->queue;
635         unsigned int logical_block_size = sdkp->device->sector_size;
636         unsigned int max_blocks = 0;
637
638         q->limits.discard_zeroes_data = 0;
639         q->limits.discard_alignment = sdkp->unmap_alignment *
640                 logical_block_size;
641         q->limits.discard_granularity =
642                 max(sdkp->physical_block_size,
643                     sdkp->unmap_granularity * logical_block_size);
644
645         sdkp->provisioning_mode = mode;
646
647         switch (mode) {
648
649         case SD_LBP_DISABLE:
650                 q->limits.max_discard_sectors = 0;
651                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
652                 return;
653
654         case SD_LBP_UNMAP:
655                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
656                                           (u32)SD_MAX_WS16_BLOCKS);
657                 break;
658
659         case SD_LBP_WS16:
660                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
661                                           (u32)SD_MAX_WS16_BLOCKS);
662                 q->limits.discard_zeroes_data = sdkp->lbprz;
663                 break;
664
665         case SD_LBP_WS10:
666                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
667                                           (u32)SD_MAX_WS10_BLOCKS);
668                 q->limits.discard_zeroes_data = sdkp->lbprz;
669                 break;
670
671         case SD_LBP_ZERO:
672                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
673                                           (u32)SD_MAX_WS10_BLOCKS);
674                 q->limits.discard_zeroes_data = 1;
675                 break;
676         }
677
678         q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
679         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
680 }
681
682 /**
683  * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
684  * @sdp: scsi device to operate one
685  * @rq: Request to prepare
686  *
687  * Will issue either UNMAP or WRITE SAME(16) depending on preference
688  * indicated by target device.
689  **/
690 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
691 {
692         struct request *rq = cmd->request;
693         struct scsi_device *sdp = cmd->device;
694         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
695         sector_t sector = blk_rq_pos(rq);
696         unsigned int nr_sectors = blk_rq_sectors(rq);
697         unsigned int nr_bytes = blk_rq_bytes(rq);
698         unsigned int len;
699         int ret;
700         char *buf;
701         struct page *page;
702
703         sector >>= ilog2(sdp->sector_size) - 9;
704         nr_sectors >>= ilog2(sdp->sector_size) - 9;
705
706         page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
707         if (!page)
708                 return BLKPREP_DEFER;
709
710         switch (sdkp->provisioning_mode) {
711         case SD_LBP_UNMAP:
712                 buf = page_address(page);
713
714                 cmd->cmd_len = 10;
715                 cmd->cmnd[0] = UNMAP;
716                 cmd->cmnd[8] = 24;
717
718                 put_unaligned_be16(6 + 16, &buf[0]);
719                 put_unaligned_be16(16, &buf[2]);
720                 put_unaligned_be64(sector, &buf[8]);
721                 put_unaligned_be32(nr_sectors, &buf[16]);
722
723                 len = 24;
724                 break;
725
726         case SD_LBP_WS16:
727                 cmd->cmd_len = 16;
728                 cmd->cmnd[0] = WRITE_SAME_16;
729                 cmd->cmnd[1] = 0x8; /* UNMAP */
730                 put_unaligned_be64(sector, &cmd->cmnd[2]);
731                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
732
733                 len = sdkp->device->sector_size;
734                 break;
735
736         case SD_LBP_WS10:
737         case SD_LBP_ZERO:
738                 cmd->cmd_len = 10;
739                 cmd->cmnd[0] = WRITE_SAME;
740                 if (sdkp->provisioning_mode == SD_LBP_WS10)
741                         cmd->cmnd[1] = 0x8; /* UNMAP */
742                 put_unaligned_be32(sector, &cmd->cmnd[2]);
743                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
744
745                 len = sdkp->device->sector_size;
746                 break;
747
748         default:
749                 ret = BLKPREP_KILL;
750                 goto out;
751         }
752
753         rq->completion_data = page;
754         rq->timeout = SD_TIMEOUT;
755
756         cmd->transfersize = len;
757         cmd->allowed = SD_MAX_RETRIES;
758
759         /*
760          * Initially __data_len is set to the amount of data that needs to be
761          * transferred to the target. This amount depends on whether WRITE SAME
762          * or UNMAP is being used. After the scatterlist has been mapped by
763          * scsi_init_io() we set __data_len to the size of the area to be
764          * discarded on disk. This allows us to report completion on the full
765          * amount of blocks described by the request.
766          */
767         blk_add_request_payload(rq, page, len);
768         ret = scsi_init_io(cmd);
769         rq->__data_len = nr_bytes;
770
771 out:
772         if (ret != BLKPREP_OK)
773                 __free_page(page);
774         return ret;
775 }
776
777 static void sd_config_write_same(struct scsi_disk *sdkp)
778 {
779         struct request_queue *q = sdkp->disk->queue;
780         unsigned int logical_block_size = sdkp->device->sector_size;
781
782         if (sdkp->device->no_write_same) {
783                 sdkp->max_ws_blocks = 0;
784                 goto out;
785         }
786
787         /* Some devices can not handle block counts above 0xffff despite
788          * supporting WRITE SAME(16). Consequently we default to 64k
789          * blocks per I/O unless the device explicitly advertises a
790          * bigger limit.
791          */
792         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
793                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
794                                                    (u32)SD_MAX_WS16_BLOCKS);
795         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
796                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
797                                                    (u32)SD_MAX_WS10_BLOCKS);
798         else {
799                 sdkp->device->no_write_same = 1;
800                 sdkp->max_ws_blocks = 0;
801         }
802
803 out:
804         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
805                                          (logical_block_size >> 9));
806 }
807
808 /**
809  * sd_setup_write_same_cmnd - write the same data to multiple blocks
810  * @cmd: command to prepare
811  *
812  * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
813  * preference indicated by target device.
814  **/
815 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
816 {
817         struct request *rq = cmd->request;
818         struct scsi_device *sdp = cmd->device;
819         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
820         struct bio *bio = rq->bio;
821         sector_t sector = blk_rq_pos(rq);
822         unsigned int nr_sectors = blk_rq_sectors(rq);
823         unsigned int nr_bytes = blk_rq_bytes(rq);
824         int ret;
825
826         if (sdkp->device->no_write_same)
827                 return BLKPREP_KILL;
828
829         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
830
831         sector >>= ilog2(sdp->sector_size) - 9;
832         nr_sectors >>= ilog2(sdp->sector_size) - 9;
833
834         rq->timeout = SD_WRITE_SAME_TIMEOUT;
835
836         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
837                 cmd->cmd_len = 16;
838                 cmd->cmnd[0] = WRITE_SAME_16;
839                 put_unaligned_be64(sector, &cmd->cmnd[2]);
840                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
841         } else {
842                 cmd->cmd_len = 10;
843                 cmd->cmnd[0] = WRITE_SAME;
844                 put_unaligned_be32(sector, &cmd->cmnd[2]);
845                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
846         }
847
848         cmd->transfersize = sdp->sector_size;
849         cmd->allowed = SD_MAX_RETRIES;
850
851         /*
852          * For WRITE_SAME the data transferred in the DATA IN buffer is
853          * different from the amount of data actually written to the target.
854          *
855          * We set up __data_len to the amount of data transferred from the
856          * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
857          * to transfer a single sector of data first, but then reset it to
858          * the amount of data to be written right after so that the I/O path
859          * knows how much to actually write.
860          */
861         rq->__data_len = sdp->sector_size;
862         ret = scsi_init_io(cmd);
863         rq->__data_len = nr_bytes;
864         return ret;
865 }
866
867 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
868 {
869         struct request *rq = cmd->request;
870
871         /* flush requests don't perform I/O, zero the S/G table */
872         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
873
874         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
875         cmd->cmd_len = 10;
876         cmd->transfersize = 0;
877         cmd->allowed = SD_MAX_RETRIES;
878
879         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
880         return BLKPREP_OK;
881 }
882
883 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
884 {
885         struct request *rq = SCpnt->request;
886         struct scsi_device *sdp = SCpnt->device;
887         struct gendisk *disk = rq->rq_disk;
888         struct scsi_disk *sdkp;
889         sector_t block = blk_rq_pos(rq);
890         sector_t threshold;
891         unsigned int this_count = blk_rq_sectors(rq);
892         unsigned int dif, dix;
893         int ret;
894         unsigned char protect;
895
896         ret = scsi_init_io(SCpnt);
897         if (ret != BLKPREP_OK)
898                 goto out;
899         SCpnt = rq->special;
900         sdkp = scsi_disk(disk);
901
902         /* from here on until we're complete, any goto out
903          * is used for a killable error condition */
904         ret = BLKPREP_KILL;
905
906         SCSI_LOG_HLQUEUE(1,
907                 scmd_printk(KERN_INFO, SCpnt,
908                         "%s: block=%llu, count=%d\n",
909                         __func__, (unsigned long long)block, this_count));
910
911         if (!sdp || !scsi_device_online(sdp) ||
912             block + blk_rq_sectors(rq) > get_capacity(disk)) {
913                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
914                                                 "Finishing %u sectors\n",
915                                                 blk_rq_sectors(rq)));
916                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
917                                                 "Retry with 0x%p\n", SCpnt));
918                 goto out;
919         }
920
921         if (sdp->changed) {
922                 /*
923                  * quietly refuse to do anything to a changed disc until 
924                  * the changed bit has been reset
925                  */
926                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
927                 goto out;
928         }
929
930         /*
931          * Some SD card readers can't handle multi-sector accesses which touch
932          * the last one or two hardware sectors.  Split accesses as needed.
933          */
934         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
935                 (sdp->sector_size / 512);
936
937         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
938                 if (block < threshold) {
939                         /* Access up to the threshold but not beyond */
940                         this_count = threshold - block;
941                 } else {
942                         /* Access only a single hardware sector */
943                         this_count = sdp->sector_size / 512;
944                 }
945         }
946
947         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
948                                         (unsigned long long)block));
949
950         /*
951          * If we have a 1K hardware sectorsize, prevent access to single
952          * 512 byte sectors.  In theory we could handle this - in fact
953          * the scsi cdrom driver must be able to handle this because
954          * we typically use 1K blocksizes, and cdroms typically have
955          * 2K hardware sectorsizes.  Of course, things are simpler
956          * with the cdrom, since it is read-only.  For performance
957          * reasons, the filesystems should be able to handle this
958          * and not force the scsi disk driver to use bounce buffers
959          * for this.
960          */
961         if (sdp->sector_size == 1024) {
962                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
963                         scmd_printk(KERN_ERR, SCpnt,
964                                     "Bad block number requested\n");
965                         goto out;
966                 } else {
967                         block = block >> 1;
968                         this_count = this_count >> 1;
969                 }
970         }
971         if (sdp->sector_size == 2048) {
972                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
973                         scmd_printk(KERN_ERR, SCpnt,
974                                     "Bad block number requested\n");
975                         goto out;
976                 } else {
977                         block = block >> 2;
978                         this_count = this_count >> 2;
979                 }
980         }
981         if (sdp->sector_size == 4096) {
982                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
983                         scmd_printk(KERN_ERR, SCpnt,
984                                     "Bad block number requested\n");
985                         goto out;
986                 } else {
987                         block = block >> 3;
988                         this_count = this_count >> 3;
989                 }
990         }
991         if (rq_data_dir(rq) == WRITE) {
992                 SCpnt->cmnd[0] = WRITE_6;
993
994                 if (blk_integrity_rq(rq))
995                         sd_dif_prepare(SCpnt);
996
997         } else if (rq_data_dir(rq) == READ) {
998                 SCpnt->cmnd[0] = READ_6;
999         } else {
1000                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1001                 goto out;
1002         }
1003
1004         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1005                                         "%s %d/%u 512 byte blocks.\n",
1006                                         (rq_data_dir(rq) == WRITE) ?
1007                                         "writing" : "reading", this_count,
1008                                         blk_rq_sectors(rq)));
1009
1010         dix = scsi_prot_sg_count(SCpnt);
1011         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1012
1013         if (dif || dix)
1014                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1015         else
1016                 protect = 0;
1017
1018         if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
1019                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1020
1021                 if (unlikely(SCpnt->cmnd == NULL)) {
1022                         ret = BLKPREP_DEFER;
1023                         goto out;
1024                 }
1025
1026                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1027                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1028                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1029                 SCpnt->cmnd[7] = 0x18;
1030                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1031                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1032
1033                 /* LBA */
1034                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1035                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1036                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1037                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1038                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1039                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1040                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1041                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1042
1043                 /* Expected Indirect LBA */
1044                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1045                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1046                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1047                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1048
1049                 /* Transfer length */
1050                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1051                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1052                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1053                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1054         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1055                 SCpnt->cmnd[0] += READ_16 - READ_6;
1056                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1057                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1058                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1059                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1060                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1061                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1062                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1063                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1064                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1065                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1066                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1067                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1068                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1069                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1070         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1071                    scsi_device_protection(SCpnt->device) ||
1072                    SCpnt->device->use_10_for_rw) {
1073                 SCpnt->cmnd[0] += READ_10 - READ_6;
1074                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1075                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1076                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1077                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1078                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1079                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1080                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1081                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1082         } else {
1083                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1084                         /*
1085                          * This happens only if this drive failed
1086                          * 10byte rw command with ILLEGAL_REQUEST
1087                          * during operation and thus turned off
1088                          * use_10_for_rw.
1089                          */
1090                         scmd_printk(KERN_ERR, SCpnt,
1091                                     "FUA write on READ/WRITE(6) drive\n");
1092                         goto out;
1093                 }
1094
1095                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1096                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1097                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1098                 SCpnt->cmnd[4] = (unsigned char) this_count;
1099                 SCpnt->cmnd[5] = 0;
1100         }
1101         SCpnt->sdb.length = this_count * sdp->sector_size;
1102
1103         /*
1104          * We shouldn't disconnect in the middle of a sector, so with a dumb
1105          * host adapter, it's safe to assume that we can at least transfer
1106          * this many bytes between each connect / disconnect.
1107          */
1108         SCpnt->transfersize = sdp->sector_size;
1109         SCpnt->underflow = this_count << 9;
1110         SCpnt->allowed = SD_MAX_RETRIES;
1111
1112         /*
1113          * This indicates that the command is ready from our end to be
1114          * queued.
1115          */
1116         ret = BLKPREP_OK;
1117  out:
1118         return ret;
1119 }
1120
1121 static int sd_init_command(struct scsi_cmnd *cmd)
1122 {
1123         struct request *rq = cmd->request;
1124
1125         if (rq->cmd_flags & REQ_DISCARD)
1126                 return sd_setup_discard_cmnd(cmd);
1127         else if (rq->cmd_flags & REQ_WRITE_SAME)
1128                 return sd_setup_write_same_cmnd(cmd);
1129         else if (rq->cmd_flags & REQ_FLUSH)
1130                 return sd_setup_flush_cmnd(cmd);
1131         else
1132                 return sd_setup_read_write_cmnd(cmd);
1133 }
1134
1135 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1136 {
1137         struct request *rq = SCpnt->request;
1138
1139         if (rq->cmd_flags & REQ_DISCARD)
1140                 __free_page(rq->completion_data);
1141
1142         if (SCpnt->cmnd != rq->cmd) {
1143                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1144                 SCpnt->cmnd = NULL;
1145                 SCpnt->cmd_len = 0;
1146         }
1147 }
1148
1149 /**
1150  *      sd_open - open a scsi disk device
1151  *      @inode: only i_rdev member may be used
1152  *      @filp: only f_mode and f_flags may be used
1153  *
1154  *      Returns 0 if successful. Returns a negated errno value in case 
1155  *      of error.
1156  *
1157  *      Note: This can be called from a user context (e.g. fsck(1) )
1158  *      or from within the kernel (e.g. as a result of a mount(1) ).
1159  *      In the latter case @inode and @filp carry an abridged amount
1160  *      of information as noted above.
1161  *
1162  *      Locking: called with bdev->bd_mutex held.
1163  **/
1164 static int sd_open(struct block_device *bdev, fmode_t mode)
1165 {
1166         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1167         struct scsi_device *sdev;
1168         int retval;
1169
1170         if (!sdkp)
1171                 return -ENXIO;
1172
1173         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1174
1175         sdev = sdkp->device;
1176
1177         /*
1178          * If the device is in error recovery, wait until it is done.
1179          * If the device is offline, then disallow any access to it.
1180          */
1181         retval = -ENXIO;
1182         if (!scsi_block_when_processing_errors(sdev))
1183                 goto error_out;
1184
1185         if (sdev->removable || sdkp->write_prot)
1186                 check_disk_change(bdev);
1187
1188         /*
1189          * If the drive is empty, just let the open fail.
1190          */
1191         retval = -ENOMEDIUM;
1192         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1193                 goto error_out;
1194
1195         /*
1196          * If the device has the write protect tab set, have the open fail
1197          * if the user expects to be able to write to the thing.
1198          */
1199         retval = -EROFS;
1200         if (sdkp->write_prot && (mode & FMODE_WRITE))
1201                 goto error_out;
1202
1203         /*
1204          * It is possible that the disk changing stuff resulted in
1205          * the device being taken offline.  If this is the case,
1206          * report this to the user, and don't pretend that the
1207          * open actually succeeded.
1208          */
1209         retval = -ENXIO;
1210         if (!scsi_device_online(sdev))
1211                 goto error_out;
1212
1213         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1214                 if (scsi_block_when_processing_errors(sdev))
1215                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1216         }
1217
1218         return 0;
1219
1220 error_out:
1221         scsi_disk_put(sdkp);
1222         return retval;  
1223 }
1224
1225 /**
1226  *      sd_release - invoked when the (last) close(2) is called on this
1227  *      scsi disk.
1228  *      @inode: only i_rdev member may be used
1229  *      @filp: only f_mode and f_flags may be used
1230  *
1231  *      Returns 0. 
1232  *
1233  *      Note: may block (uninterruptible) if error recovery is underway
1234  *      on this disk.
1235  *
1236  *      Locking: called with bdev->bd_mutex held.
1237  **/
1238 static void sd_release(struct gendisk *disk, fmode_t mode)
1239 {
1240         struct scsi_disk *sdkp = scsi_disk(disk);
1241         struct scsi_device *sdev = sdkp->device;
1242
1243         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1244
1245         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1246                 if (scsi_block_when_processing_errors(sdev))
1247                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1248         }
1249
1250         /*
1251          * XXX and what if there are packets in flight and this close()
1252          * XXX is followed by a "rmmod sd_mod"?
1253          */
1254
1255         scsi_disk_put(sdkp);
1256 }
1257
1258 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1259 {
1260         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1261         struct scsi_device *sdp = sdkp->device;
1262         struct Scsi_Host *host = sdp->host;
1263         int diskinfo[4];
1264
1265         /* default to most commonly used values */
1266         diskinfo[0] = 0x40;     /* 1 << 6 */
1267         diskinfo[1] = 0x20;     /* 1 << 5 */
1268         diskinfo[2] = sdkp->capacity >> 11;
1269         
1270         /* override with calculated, extended default, or driver values */
1271         if (host->hostt->bios_param)
1272                 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1273         else
1274                 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1275
1276         geo->heads = diskinfo[0];
1277         geo->sectors = diskinfo[1];
1278         geo->cylinders = diskinfo[2];
1279         return 0;
1280 }
1281
1282 /**
1283  *      sd_ioctl - process an ioctl
1284  *      @inode: only i_rdev/i_bdev members may be used
1285  *      @filp: only f_mode and f_flags may be used
1286  *      @cmd: ioctl command number
1287  *      @arg: this is third argument given to ioctl(2) system call.
1288  *      Often contains a pointer.
1289  *
1290  *      Returns 0 if successful (some ioctls return positive numbers on
1291  *      success as well). Returns a negated errno value in case of error.
1292  *
1293  *      Note: most ioctls are forward onto the block subsystem or further
1294  *      down in the scsi subsystem.
1295  **/
1296 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1297                     unsigned int cmd, unsigned long arg)
1298 {
1299         struct gendisk *disk = bdev->bd_disk;
1300         struct scsi_disk *sdkp = scsi_disk(disk);
1301         struct scsi_device *sdp = sdkp->device;
1302         void __user *p = (void __user *)arg;
1303         int error;
1304     
1305         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1306                                     "cmd=0x%x\n", disk->disk_name, cmd));
1307
1308         error = scsi_verify_blk_ioctl(bdev, cmd);
1309         if (error < 0)
1310                 return error;
1311
1312         /*
1313          * If we are in the middle of error recovery, don't let anyone
1314          * else try and use this device.  Also, if error recovery fails, it
1315          * may try and take the device offline, in which case all further
1316          * access to the device is prohibited.
1317          */
1318         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1319                         (mode & FMODE_NDELAY) != 0);
1320         if (error)
1321                 goto out;
1322
1323         /*
1324          * Send SCSI addressing ioctls directly to mid level, send other
1325          * ioctls to block level and then onto mid level if they can't be
1326          * resolved.
1327          */
1328         switch (cmd) {
1329                 case SCSI_IOCTL_GET_IDLUN:
1330                 case SCSI_IOCTL_GET_BUS_NUMBER:
1331                         error = scsi_ioctl(sdp, cmd, p);
1332                         break;
1333                 default:
1334                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1335                         if (error != -ENOTTY)
1336                                 break;
1337                         error = scsi_ioctl(sdp, cmd, p);
1338                         break;
1339         }
1340 out:
1341         return error;
1342 }
1343
1344 static void set_media_not_present(struct scsi_disk *sdkp)
1345 {
1346         if (sdkp->media_present)
1347                 sdkp->device->changed = 1;
1348
1349         if (sdkp->device->removable) {
1350                 sdkp->media_present = 0;
1351                 sdkp->capacity = 0;
1352         }
1353 }
1354
1355 static int media_not_present(struct scsi_disk *sdkp,
1356                              struct scsi_sense_hdr *sshdr)
1357 {
1358         if (!scsi_sense_valid(sshdr))
1359                 return 0;
1360
1361         /* not invoked for commands that could return deferred errors */
1362         switch (sshdr->sense_key) {
1363         case UNIT_ATTENTION:
1364         case NOT_READY:
1365                 /* medium not present */
1366                 if (sshdr->asc == 0x3A) {
1367                         set_media_not_present(sdkp);
1368                         return 1;
1369                 }
1370         }
1371         return 0;
1372 }
1373
1374 /**
1375  *      sd_check_events - check media events
1376  *      @disk: kernel device descriptor
1377  *      @clearing: disk events currently being cleared
1378  *
1379  *      Returns mask of DISK_EVENT_*.
1380  *
1381  *      Note: this function is invoked from the block subsystem.
1382  **/
1383 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1384 {
1385         struct scsi_disk *sdkp = scsi_disk(disk);
1386         struct scsi_device *sdp = sdkp->device;
1387         struct scsi_sense_hdr *sshdr = NULL;
1388         int retval;
1389
1390         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1391
1392         /*
1393          * If the device is offline, don't send any commands - just pretend as
1394          * if the command failed.  If the device ever comes back online, we
1395          * can deal with it then.  It is only because of unrecoverable errors
1396          * that we would ever take a device offline in the first place.
1397          */
1398         if (!scsi_device_online(sdp)) {
1399                 set_media_not_present(sdkp);
1400                 goto out;
1401         }
1402
1403         /*
1404          * Using TEST_UNIT_READY enables differentiation between drive with
1405          * no cartridge loaded - NOT READY, drive with changed cartridge -
1406          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1407          *
1408          * Drives that auto spin down. eg iomega jaz 1G, will be started
1409          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1410          * sd_revalidate() is called.
1411          */
1412         retval = -ENODEV;
1413
1414         if (scsi_block_when_processing_errors(sdp)) {
1415                 sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1416                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1417                                               sshdr);
1418         }
1419
1420         /* failed to execute TUR, assume media not present */
1421         if (host_byte(retval)) {
1422                 set_media_not_present(sdkp);
1423                 goto out;
1424         }
1425
1426         if (media_not_present(sdkp, sshdr))
1427                 goto out;
1428
1429         /*
1430          * For removable scsi disk we have to recognise the presence
1431          * of a disk in the drive.
1432          */
1433         if (!sdkp->media_present)
1434                 sdp->changed = 1;
1435         sdkp->media_present = 1;
1436 out:
1437         /*
1438          * sdp->changed is set under the following conditions:
1439          *
1440          *      Medium present state has changed in either direction.
1441          *      Device has indicated UNIT_ATTENTION.
1442          */
1443         kfree(sshdr);
1444         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1445         sdp->changed = 0;
1446         return retval;
1447 }
1448
1449 static int sd_sync_cache(struct scsi_disk *sdkp)
1450 {
1451         int retries, res;
1452         struct scsi_device *sdp = sdkp->device;
1453         const int timeout = sdp->request_queue->rq_timeout
1454                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1455         struct scsi_sense_hdr sshdr;
1456
1457         if (!scsi_device_online(sdp))
1458                 return -ENODEV;
1459
1460         for (retries = 3; retries > 0; --retries) {
1461                 unsigned char cmd[10] = { 0 };
1462
1463                 cmd[0] = SYNCHRONIZE_CACHE;
1464                 /*
1465                  * Leave the rest of the command zero to indicate
1466                  * flush everything.
1467                  */
1468                 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1469                                              &sshdr, timeout, SD_MAX_RETRIES,
1470                                              NULL, REQ_PM);
1471                 if (res == 0)
1472                         break;
1473         }
1474
1475         if (res) {
1476                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1477
1478                 if (driver_byte(res) & DRIVER_SENSE)
1479                         sd_print_sense_hdr(sdkp, &sshdr);
1480                 /* we need to evaluate the error return  */
1481                 if (scsi_sense_valid(&sshdr) &&
1482                         (sshdr.asc == 0x3a ||   /* medium not present */
1483                          sshdr.asc == 0x20))    /* invalid command */
1484                                 /* this is no error here */
1485                                 return 0;
1486
1487                 switch (host_byte(res)) {
1488                 /* ignore errors due to racing a disconnection */
1489                 case DID_BAD_TARGET:
1490                 case DID_NO_CONNECT:
1491                         return 0;
1492                 /* signal the upper layer it might try again */
1493                 case DID_BUS_BUSY:
1494                 case DID_IMM_RETRY:
1495                 case DID_REQUEUE:
1496                 case DID_SOFT_ERROR:
1497                         return -EBUSY;
1498                 default:
1499                         return -EIO;
1500                 }
1501         }
1502         return 0;
1503 }
1504
1505 static void sd_rescan(struct device *dev)
1506 {
1507         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1508
1509         revalidate_disk(sdkp->disk);
1510 }
1511
1512
1513 #ifdef CONFIG_COMPAT
1514 /* 
1515  * This gets directly called from VFS. When the ioctl 
1516  * is not recognized we go back to the other translation paths. 
1517  */
1518 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1519                            unsigned int cmd, unsigned long arg)
1520 {
1521         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1522         int error;
1523
1524         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1525                         (mode & FMODE_NDELAY) != 0);
1526         if (error)
1527                 return error;
1528                
1529         /* 
1530          * Let the static ioctl translation table take care of it.
1531          */
1532         if (!sdev->host->hostt->compat_ioctl)
1533                 return -ENOIOCTLCMD; 
1534         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1535 }
1536 #endif
1537
1538 static const struct block_device_operations sd_fops = {
1539         .owner                  = THIS_MODULE,
1540         .open                   = sd_open,
1541         .release                = sd_release,
1542         .ioctl                  = sd_ioctl,
1543         .getgeo                 = sd_getgeo,
1544 #ifdef CONFIG_COMPAT
1545         .compat_ioctl           = sd_compat_ioctl,
1546 #endif
1547         .check_events           = sd_check_events,
1548         .revalidate_disk        = sd_revalidate_disk,
1549         .unlock_native_capacity = sd_unlock_native_capacity,
1550 };
1551
1552 /**
1553  *      sd_eh_action - error handling callback
1554  *      @scmd:          sd-issued command that has failed
1555  *      @eh_disp:       The recovery disposition suggested by the midlayer
1556  *
1557  *      This function is called by the SCSI midlayer upon completion of an
1558  *      error test command (currently TEST UNIT READY). The result of sending
1559  *      the eh command is passed in eh_disp.  We're looking for devices that
1560  *      fail medium access commands but are OK with non access commands like
1561  *      test unit ready (so wrongly see the device as having a successful
1562  *      recovery)
1563  **/
1564 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1565 {
1566         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1567
1568         if (!scsi_device_online(scmd->device) ||
1569             !scsi_medium_access_command(scmd) ||
1570             host_byte(scmd->result) != DID_TIME_OUT ||
1571             eh_disp != SUCCESS)
1572                 return eh_disp;
1573
1574         /*
1575          * The device has timed out executing a medium access command.
1576          * However, the TEST UNIT READY command sent during error
1577          * handling completed successfully. Either the device is in the
1578          * process of recovering or has it suffered an internal failure
1579          * that prevents access to the storage medium.
1580          */
1581         sdkp->medium_access_timed_out++;
1582
1583         /*
1584          * If the device keeps failing read/write commands but TEST UNIT
1585          * READY always completes successfully we assume that medium
1586          * access is no longer possible and take the device offline.
1587          */
1588         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1589                 scmd_printk(KERN_ERR, scmd,
1590                             "Medium access timeout failure. Offlining disk!\n");
1591                 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1592
1593                 return FAILED;
1594         }
1595
1596         return eh_disp;
1597 }
1598
1599 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1600 {
1601         u64 start_lba = blk_rq_pos(scmd->request);
1602         u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1603         u64 factor = scmd->device->sector_size / 512;
1604         u64 bad_lba;
1605         int info_valid;
1606         /*
1607          * resid is optional but mostly filled in.  When it's unused,
1608          * its value is zero, so we assume the whole buffer transferred
1609          */
1610         unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1611         unsigned int good_bytes;
1612
1613         if (scmd->request->cmd_type != REQ_TYPE_FS)
1614                 return 0;
1615
1616         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1617                                              SCSI_SENSE_BUFFERSIZE,
1618                                              &bad_lba);
1619         if (!info_valid)
1620                 return 0;
1621
1622         if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1623                 return 0;
1624
1625         /* be careful ... don't want any overflows */
1626         do_div(start_lba, factor);
1627         do_div(end_lba, factor);
1628
1629         /* The bad lba was reported incorrectly, we have no idea where
1630          * the error is.
1631          */
1632         if (bad_lba < start_lba  || bad_lba >= end_lba)
1633                 return 0;
1634
1635         /* This computation should always be done in terms of
1636          * the resolution of the device's medium.
1637          */
1638         good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1639         return min(good_bytes, transferred);
1640 }
1641
1642 /**
1643  *      sd_done - bottom half handler: called when the lower level
1644  *      driver has completed (successfully or otherwise) a scsi command.
1645  *      @SCpnt: mid-level's per command structure.
1646  *
1647  *      Note: potentially run from within an ISR. Must not block.
1648  **/
1649 static int sd_done(struct scsi_cmnd *SCpnt)
1650 {
1651         int result = SCpnt->result;
1652         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1653         struct scsi_sense_hdr sshdr;
1654         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1655         struct request *req = SCpnt->request;
1656         int sense_valid = 0;
1657         int sense_deferred = 0;
1658         unsigned char op = SCpnt->cmnd[0];
1659         unsigned char unmap = SCpnt->cmnd[1] & 8;
1660
1661         if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1662                 if (!result) {
1663                         good_bytes = blk_rq_bytes(req);
1664                         scsi_set_resid(SCpnt, 0);
1665                 } else {
1666                         good_bytes = 0;
1667                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1668                 }
1669         }
1670
1671         if (result) {
1672                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1673                 if (sense_valid)
1674                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1675         }
1676         sdkp->medium_access_timed_out = 0;
1677
1678         if (driver_byte(result) != DRIVER_SENSE &&
1679             (!sense_valid || sense_deferred))
1680                 goto out;
1681
1682         switch (sshdr.sense_key) {
1683         case HARDWARE_ERROR:
1684         case MEDIUM_ERROR:
1685                 good_bytes = sd_completed_bytes(SCpnt);
1686                 break;
1687         case RECOVERED_ERROR:
1688                 good_bytes = scsi_bufflen(SCpnt);
1689                 break;
1690         case NO_SENSE:
1691                 /* This indicates a false check condition, so ignore it.  An
1692                  * unknown amount of data was transferred so treat it as an
1693                  * error.
1694                  */
1695                 SCpnt->result = 0;
1696                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1697                 break;
1698         case ABORTED_COMMAND:
1699                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1700                         good_bytes = sd_completed_bytes(SCpnt);
1701                 break;
1702         case ILLEGAL_REQUEST:
1703                 if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1704                         good_bytes = sd_completed_bytes(SCpnt);
1705                 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1706                 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1707                         switch (op) {
1708                         case UNMAP:
1709                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
1710                                 break;
1711                         case WRITE_SAME_16:
1712                         case WRITE_SAME:
1713                                 if (unmap)
1714                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
1715                                 else {
1716                                         sdkp->device->no_write_same = 1;
1717                                         sd_config_write_same(sdkp);
1718
1719                                         good_bytes = 0;
1720                                         req->__data_len = blk_rq_bytes(req);
1721                                         req->cmd_flags |= REQ_QUIET;
1722                                 }
1723                         }
1724                 }
1725                 break;
1726         default:
1727                 break;
1728         }
1729  out:
1730         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1731                                            "sd_done: completed %d of %d bytes\n",
1732                                            good_bytes, scsi_bufflen(SCpnt)));
1733
1734         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1735                 sd_dif_complete(SCpnt, good_bytes);
1736
1737         return good_bytes;
1738 }
1739
1740 /*
1741  * spinup disk - called only in sd_revalidate_disk()
1742  */
1743 static void
1744 sd_spinup_disk(struct scsi_disk *sdkp)
1745 {
1746         unsigned char cmd[10];
1747         unsigned long spintime_expire = 0;
1748         int retries, spintime;
1749         unsigned int the_result;
1750         struct scsi_sense_hdr sshdr;
1751         int sense_valid = 0;
1752
1753         spintime = 0;
1754
1755         /* Spin up drives, as required.  Only do this at boot time */
1756         /* Spinup needs to be done for module loads too. */
1757         do {
1758                 retries = 0;
1759
1760                 do {
1761                         cmd[0] = TEST_UNIT_READY;
1762                         memset((void *) &cmd[1], 0, 9);
1763
1764                         the_result = scsi_execute_req(sdkp->device, cmd,
1765                                                       DMA_NONE, NULL, 0,
1766                                                       &sshdr, SD_TIMEOUT,
1767                                                       SD_MAX_RETRIES, NULL);
1768
1769                         /*
1770                          * If the drive has indicated to us that it
1771                          * doesn't have any media in it, don't bother
1772                          * with any more polling.
1773                          */
1774                         if (media_not_present(sdkp, &sshdr))
1775                                 return;
1776
1777                         if (the_result)
1778                                 sense_valid = scsi_sense_valid(&sshdr);
1779                         retries++;
1780                 } while (retries < 3 && 
1781                          (!scsi_status_is_good(the_result) ||
1782                           ((driver_byte(the_result) & DRIVER_SENSE) &&
1783                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1784
1785                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1786                         /* no sense, TUR either succeeded or failed
1787                          * with a status error */
1788                         if(!spintime && !scsi_status_is_good(the_result)) {
1789                                 sd_print_result(sdkp, "Test Unit Ready failed",
1790                                                 the_result);
1791                         }
1792                         break;
1793                 }
1794
1795                 /*
1796                  * The device does not want the automatic start to be issued.
1797                  */
1798                 if (sdkp->device->no_start_on_add)
1799                         break;
1800
1801                 if (sense_valid && sshdr.sense_key == NOT_READY) {
1802                         if (sshdr.asc == 4 && sshdr.ascq == 3)
1803                                 break;  /* manual intervention required */
1804                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1805                                 break;  /* standby */
1806                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1807                                 break;  /* unavailable */
1808                         /*
1809                          * Issue command to spin up drive when not ready
1810                          */
1811                         if (!spintime) {
1812                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1813                                 cmd[0] = START_STOP;
1814                                 cmd[1] = 1;     /* Return immediately */
1815                                 memset((void *) &cmd[2], 0, 8);
1816                                 cmd[4] = 1;     /* Start spin cycle */
1817                                 if (sdkp->device->start_stop_pwr_cond)
1818                                         cmd[4] |= 1 << 4;
1819                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1820                                                  NULL, 0, &sshdr,
1821                                                  SD_TIMEOUT, SD_MAX_RETRIES,
1822                                                  NULL);
1823                                 spintime_expire = jiffies + 100 * HZ;
1824                                 spintime = 1;
1825                         }
1826                         /* Wait 1 second for next try */
1827                         msleep(1000);
1828                         printk(".");
1829
1830                 /*
1831                  * Wait for USB flash devices with slow firmware.
1832                  * Yes, this sense key/ASC combination shouldn't
1833                  * occur here.  It's characteristic of these devices.
1834                  */
1835                 } else if (sense_valid &&
1836                                 sshdr.sense_key == UNIT_ATTENTION &&
1837                                 sshdr.asc == 0x28) {
1838                         if (!spintime) {
1839                                 spintime_expire = jiffies + 5 * HZ;
1840                                 spintime = 1;
1841                         }
1842                         /* Wait 1 second for next try */
1843                         msleep(1000);
1844                 } else {
1845                         /* we don't understand the sense code, so it's
1846                          * probably pointless to loop */
1847                         if(!spintime) {
1848                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1849                                 sd_print_sense_hdr(sdkp, &sshdr);
1850                         }
1851                         break;
1852                 }
1853                                 
1854         } while (spintime && time_before_eq(jiffies, spintime_expire));
1855
1856         if (spintime) {
1857                 if (scsi_status_is_good(the_result))
1858                         printk("ready\n");
1859                 else
1860                         printk("not responding...\n");
1861         }
1862 }
1863
1864
1865 /*
1866  * Determine whether disk supports Data Integrity Field.
1867  */
1868 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1869 {
1870         struct scsi_device *sdp = sdkp->device;
1871         u8 type;
1872         int ret = 0;
1873
1874         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1875                 return ret;
1876
1877         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1878
1879         if (type > SD_DIF_TYPE3_PROTECTION)
1880                 ret = -ENODEV;
1881         else if (scsi_host_dif_capable(sdp->host, type))
1882                 ret = 1;
1883
1884         if (sdkp->first_scan || type != sdkp->protection_type)
1885                 switch (ret) {
1886                 case -ENODEV:
1887                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1888                                   " protection type %u. Disabling disk!\n",
1889                                   type);
1890                         break;
1891                 case 1:
1892                         sd_printk(KERN_NOTICE, sdkp,
1893                                   "Enabling DIF Type %u protection\n", type);
1894                         break;
1895                 case 0:
1896                         sd_printk(KERN_NOTICE, sdkp,
1897                                   "Disabling DIF Type %u protection\n", type);
1898                         break;
1899                 }
1900
1901         sdkp->protection_type = type;
1902
1903         return ret;
1904 }
1905
1906 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1907                         struct scsi_sense_hdr *sshdr, int sense_valid,
1908                         int the_result)
1909 {
1910         if (driver_byte(the_result) & DRIVER_SENSE)
1911                 sd_print_sense_hdr(sdkp, sshdr);
1912         else
1913                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1914
1915         /*
1916          * Set dirty bit for removable devices if not ready -
1917          * sometimes drives will not report this properly.
1918          */
1919         if (sdp->removable &&
1920             sense_valid && sshdr->sense_key == NOT_READY)
1921                 set_media_not_present(sdkp);
1922
1923         /*
1924          * We used to set media_present to 0 here to indicate no media
1925          * in the drive, but some drives fail read capacity even with
1926          * media present, so we can't do that.
1927          */
1928         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1929 }
1930
1931 #define RC16_LEN 32
1932 #if RC16_LEN > SD_BUF_SIZE
1933 #error RC16_LEN must not be more than SD_BUF_SIZE
1934 #endif
1935
1936 #define READ_CAPACITY_RETRIES_ON_RESET  10
1937
1938 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1939                                                 unsigned char *buffer)
1940 {
1941         unsigned char cmd[16];
1942         struct scsi_sense_hdr sshdr;
1943         int sense_valid = 0;
1944         int the_result;
1945         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1946         unsigned int alignment;
1947         unsigned long long lba;
1948         unsigned sector_size;
1949
1950         if (sdp->no_read_capacity_16)
1951                 return -EINVAL;
1952
1953         do {
1954                 memset(cmd, 0, 16);
1955                 cmd[0] = SERVICE_ACTION_IN_16;
1956                 cmd[1] = SAI_READ_CAPACITY_16;
1957                 cmd[13] = RC16_LEN;
1958                 memset(buffer, 0, RC16_LEN);
1959
1960                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1961                                         buffer, RC16_LEN, &sshdr,
1962                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1963
1964                 if (media_not_present(sdkp, &sshdr))
1965                         return -ENODEV;
1966
1967                 if (the_result) {
1968                         sense_valid = scsi_sense_valid(&sshdr);
1969                         if (sense_valid &&
1970                             sshdr.sense_key == ILLEGAL_REQUEST &&
1971                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1972                             sshdr.ascq == 0x00)
1973                                 /* Invalid Command Operation Code or
1974                                  * Invalid Field in CDB, just retry
1975                                  * silently with RC10 */
1976                                 return -EINVAL;
1977                         if (sense_valid &&
1978                             sshdr.sense_key == UNIT_ATTENTION &&
1979                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1980                                 /* Device reset might occur several times,
1981                                  * give it one more chance */
1982                                 if (--reset_retries > 0)
1983                                         continue;
1984                 }
1985                 retries--;
1986
1987         } while (the_result && retries);
1988
1989         if (the_result) {
1990                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
1991                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1992                 return -EINVAL;
1993         }
1994
1995         sector_size = get_unaligned_be32(&buffer[8]);
1996         lba = get_unaligned_be64(&buffer[0]);
1997
1998         if (sd_read_protection_type(sdkp, buffer) < 0) {
1999                 sdkp->capacity = 0;
2000                 return -ENODEV;
2001         }
2002
2003         if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2004                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2005                         "kernel compiled with support for large block "
2006                         "devices.\n");
2007                 sdkp->capacity = 0;
2008                 return -EOVERFLOW;
2009         }
2010
2011         /* Logical blocks per physical block exponent */
2012         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2013
2014         /* Lowest aligned logical block */
2015         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2016         blk_queue_alignment_offset(sdp->request_queue, alignment);
2017         if (alignment && sdkp->first_scan)
2018                 sd_printk(KERN_NOTICE, sdkp,
2019                           "physical block alignment offset: %u\n", alignment);
2020
2021         if (buffer[14] & 0x80) { /* LBPME */
2022                 sdkp->lbpme = 1;
2023
2024                 if (buffer[14] & 0x40) /* LBPRZ */
2025                         sdkp->lbprz = 1;
2026
2027                 sd_config_discard(sdkp, SD_LBP_WS16);
2028         }
2029
2030         sdkp->capacity = lba + 1;
2031         return sector_size;
2032 }
2033
2034 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2035                                                 unsigned char *buffer)
2036 {
2037         unsigned char cmd[16];
2038         struct scsi_sense_hdr sshdr;
2039         int sense_valid = 0;
2040         int the_result;
2041         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2042         sector_t lba;
2043         unsigned sector_size;
2044
2045         do {
2046                 cmd[0] = READ_CAPACITY;
2047                 memset(&cmd[1], 0, 9);
2048                 memset(buffer, 0, 8);
2049
2050                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2051                                         buffer, 8, &sshdr,
2052                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2053
2054                 if (media_not_present(sdkp, &sshdr))
2055                         return -ENODEV;
2056
2057                 if (the_result) {
2058                         sense_valid = scsi_sense_valid(&sshdr);
2059                         if (sense_valid &&
2060                             sshdr.sense_key == UNIT_ATTENTION &&
2061                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2062                                 /* Device reset might occur several times,
2063                                  * give it one more chance */
2064                                 if (--reset_retries > 0)
2065                                         continue;
2066                 }
2067                 retries--;
2068
2069         } while (the_result && retries);
2070
2071         if (the_result) {
2072                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2073                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2074                 return -EINVAL;
2075         }
2076
2077         sector_size = get_unaligned_be32(&buffer[4]);
2078         lba = get_unaligned_be32(&buffer[0]);
2079
2080         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2081                 /* Some buggy (usb cardreader) devices return an lba of
2082                    0xffffffff when the want to report a size of 0 (with
2083                    which they really mean no media is present) */
2084                 sdkp->capacity = 0;
2085                 sdkp->physical_block_size = sector_size;
2086                 return sector_size;
2087         }
2088
2089         if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2090                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2091                         "kernel compiled with support for large block "
2092                         "devices.\n");
2093                 sdkp->capacity = 0;
2094                 return -EOVERFLOW;
2095         }
2096
2097         sdkp->capacity = lba + 1;
2098         sdkp->physical_block_size = sector_size;
2099         return sector_size;
2100 }
2101
2102 static int sd_try_rc16_first(struct scsi_device *sdp)
2103 {
2104         if (sdp->host->max_cmd_len < 16)
2105                 return 0;
2106         if (sdp->try_rc_10_first)
2107                 return 0;
2108         if (sdp->scsi_level > SCSI_SPC_2)
2109                 return 1;
2110         if (scsi_device_protection(sdp))
2111                 return 1;
2112         return 0;
2113 }
2114
2115 /*
2116  * read disk capacity
2117  */
2118 static void
2119 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2120 {
2121         int sector_size;
2122         struct scsi_device *sdp = sdkp->device;
2123         sector_t old_capacity = sdkp->capacity;
2124
2125         if (sd_try_rc16_first(sdp)) {
2126                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2127                 if (sector_size == -EOVERFLOW)
2128                         goto got_data;
2129                 if (sector_size == -ENODEV)
2130                         return;
2131                 if (sector_size < 0)
2132                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2133                 if (sector_size < 0)
2134                         return;
2135         } else {
2136                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2137                 if (sector_size == -EOVERFLOW)
2138                         goto got_data;
2139                 if (sector_size < 0)
2140                         return;
2141                 if ((sizeof(sdkp->capacity) > 4) &&
2142                     (sdkp->capacity > 0xffffffffULL)) {
2143                         int old_sector_size = sector_size;
2144                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2145                                         "Trying to use READ CAPACITY(16).\n");
2146                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2147                         if (sector_size < 0) {
2148                                 sd_printk(KERN_NOTICE, sdkp,
2149                                         "Using 0xffffffff as device size\n");
2150                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2151                                 sector_size = old_sector_size;
2152                                 goto got_data;
2153                         }
2154                 }
2155         }
2156
2157         /* Some devices are known to return the total number of blocks,
2158          * not the highest block number.  Some devices have versions
2159          * which do this and others which do not.  Some devices we might
2160          * suspect of doing this but we don't know for certain.
2161          *
2162          * If we know the reported capacity is wrong, decrement it.  If
2163          * we can only guess, then assume the number of blocks is even
2164          * (usually true but not always) and err on the side of lowering
2165          * the capacity.
2166          */
2167         if (sdp->fix_capacity ||
2168             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2169                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2170                                 "from its reported value: %llu\n",
2171                                 (unsigned long long) sdkp->capacity);
2172                 --sdkp->capacity;
2173         }
2174
2175 got_data:
2176         if (sector_size == 0) {
2177                 sector_size = 512;
2178                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2179                           "assuming 512.\n");
2180         }
2181
2182         if (sector_size != 512 &&
2183             sector_size != 1024 &&
2184             sector_size != 2048 &&
2185             sector_size != 4096) {
2186                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2187                           sector_size);
2188                 /*
2189                  * The user might want to re-format the drive with
2190                  * a supported sectorsize.  Once this happens, it
2191                  * would be relatively trivial to set the thing up.
2192                  * For this reason, we leave the thing in the table.
2193                  */
2194                 sdkp->capacity = 0;
2195                 /*
2196                  * set a bogus sector size so the normal read/write
2197                  * logic in the block layer will eventually refuse any
2198                  * request on this device without tripping over power
2199                  * of two sector size assumptions
2200                  */
2201                 sector_size = 512;
2202         }
2203         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2204
2205         {
2206                 char cap_str_2[10], cap_str_10[10];
2207
2208                 string_get_size(sdkp->capacity, sector_size,
2209                                 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2210                 string_get_size(sdkp->capacity, sector_size,
2211                                 STRING_UNITS_10, cap_str_10,
2212                                 sizeof(cap_str_10));
2213
2214                 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2215                         sd_printk(KERN_NOTICE, sdkp,
2216                                   "%llu %d-byte logical blocks: (%s/%s)\n",
2217                                   (unsigned long long)sdkp->capacity,
2218                                   sector_size, cap_str_10, cap_str_2);
2219
2220                         if (sdkp->physical_block_size != sector_size)
2221                                 sd_printk(KERN_NOTICE, sdkp,
2222                                           "%u-byte physical blocks\n",
2223                                           sdkp->physical_block_size);
2224                 }
2225         }
2226
2227         if (sdkp->capacity > 0xffffffff) {
2228                 sdp->use_16_for_rw = 1;
2229                 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS;
2230         } else
2231                 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
2232
2233         /* Rescale capacity to 512-byte units */
2234         if (sector_size == 4096)
2235                 sdkp->capacity <<= 3;
2236         else if (sector_size == 2048)
2237                 sdkp->capacity <<= 2;
2238         else if (sector_size == 1024)
2239                 sdkp->capacity <<= 1;
2240
2241         blk_queue_physical_block_size(sdp->request_queue,
2242                                       sdkp->physical_block_size);
2243         sdkp->device->sector_size = sector_size;
2244 }
2245
2246 /* called with buffer of length 512 */
2247 static inline int
2248 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2249                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2250                  struct scsi_sense_hdr *sshdr)
2251 {
2252         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2253                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2254                                sshdr);
2255 }
2256
2257 /*
2258  * read write protect setting, if possible - called only in sd_revalidate_disk()
2259  * called with buffer of length SD_BUF_SIZE
2260  */
2261 static void
2262 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2263 {
2264         int res;
2265         struct scsi_device *sdp = sdkp->device;
2266         struct scsi_mode_data data;
2267         int old_wp = sdkp->write_prot;
2268
2269         set_disk_ro(sdkp->disk, 0);
2270         if (sdp->skip_ms_page_3f) {
2271                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2272                 return;
2273         }
2274
2275         if (sdp->use_192_bytes_for_3f) {
2276                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2277         } else {
2278                 /*
2279                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2280                  * We have to start carefully: some devices hang if we ask
2281                  * for more than is available.
2282                  */
2283                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2284
2285                 /*
2286                  * Second attempt: ask for page 0 When only page 0 is
2287                  * implemented, a request for page 3F may return Sense Key
2288                  * 5: Illegal Request, Sense Code 24: Invalid field in
2289                  * CDB.
2290                  */
2291                 if (!scsi_status_is_good(res))
2292                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2293
2294                 /*
2295                  * Third attempt: ask 255 bytes, as we did earlier.
2296                  */
2297                 if (!scsi_status_is_good(res))
2298                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2299                                                &data, NULL);
2300         }
2301
2302         if (!scsi_status_is_good(res)) {
2303                 sd_first_printk(KERN_WARNING, sdkp,
2304                           "Test WP failed, assume Write Enabled\n");
2305         } else {
2306                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2307                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2308                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2309                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2310                                   sdkp->write_prot ? "on" : "off");
2311                         sd_printk(KERN_DEBUG, sdkp,
2312                                   "Mode Sense: %02x %02x %02x %02x\n",
2313                                   buffer[0], buffer[1], buffer[2], buffer[3]);
2314                 }
2315         }
2316 }
2317
2318 /*
2319  * sd_read_cache_type - called only from sd_revalidate_disk()
2320  * called with buffer of length SD_BUF_SIZE
2321  */
2322 static void
2323 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2324 {
2325         int len = 0, res;
2326         struct scsi_device *sdp = sdkp->device;
2327
2328         int dbd;
2329         int modepage;
2330         int first_len;
2331         struct scsi_mode_data data;
2332         struct scsi_sense_hdr sshdr;
2333         int old_wce = sdkp->WCE;
2334         int old_rcd = sdkp->RCD;
2335         int old_dpofua = sdkp->DPOFUA;
2336
2337
2338         if (sdkp->cache_override)
2339                 return;
2340
2341         first_len = 4;
2342         if (sdp->skip_ms_page_8) {
2343                 if (sdp->type == TYPE_RBC)
2344                         goto defaults;
2345                 else {
2346                         if (sdp->skip_ms_page_3f)
2347                                 goto defaults;
2348                         modepage = 0x3F;
2349                         if (sdp->use_192_bytes_for_3f)
2350                                 first_len = 192;
2351                         dbd = 0;
2352                 }
2353         } else if (sdp->type == TYPE_RBC) {
2354                 modepage = 6;
2355                 dbd = 8;
2356         } else {
2357                 modepage = 8;
2358                 dbd = 0;
2359         }
2360
2361         /* cautiously ask */
2362         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2363                         &data, &sshdr);
2364
2365         if (!scsi_status_is_good(res))
2366                 goto bad_sense;
2367
2368         if (!data.header_length) {
2369                 modepage = 6;
2370                 first_len = 0;
2371                 sd_first_printk(KERN_ERR, sdkp,
2372                                 "Missing header in MODE_SENSE response\n");
2373         }
2374
2375         /* that went OK, now ask for the proper length */
2376         len = data.length;
2377
2378         /*
2379          * We're only interested in the first three bytes, actually.
2380          * But the data cache page is defined for the first 20.
2381          */
2382         if (len < 3)
2383                 goto bad_sense;
2384         else if (len > SD_BUF_SIZE) {
2385                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2386                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2387                 len = SD_BUF_SIZE;
2388         }
2389         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2390                 len = 192;
2391
2392         /* Get the data */
2393         if (len > first_len)
2394                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2395                                 &data, &sshdr);
2396
2397         if (scsi_status_is_good(res)) {
2398                 int offset = data.header_length + data.block_descriptor_length;
2399
2400                 while (offset < len) {
2401                         u8 page_code = buffer[offset] & 0x3F;
2402                         u8 spf       = buffer[offset] & 0x40;
2403
2404                         if (page_code == 8 || page_code == 6) {
2405                                 /* We're interested only in the first 3 bytes.
2406                                  */
2407                                 if (len - offset <= 2) {
2408                                         sd_first_printk(KERN_ERR, sdkp,
2409                                                 "Incomplete mode parameter "
2410                                                         "data\n");
2411                                         goto defaults;
2412                                 } else {
2413                                         modepage = page_code;
2414                                         goto Page_found;
2415                                 }
2416                         } else {
2417                                 /* Go to the next page */
2418                                 if (spf && len - offset > 3)
2419                                         offset += 4 + (buffer[offset+2] << 8) +
2420                                                 buffer[offset+3];
2421                                 else if (!spf && len - offset > 1)
2422                                         offset += 2 + buffer[offset+1];
2423                                 else {
2424                                         sd_first_printk(KERN_ERR, sdkp,
2425                                                         "Incomplete mode "
2426                                                         "parameter data\n");
2427                                         goto defaults;
2428                                 }
2429                         }
2430                 }
2431
2432                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2433                 goto defaults;
2434
2435         Page_found:
2436                 if (modepage == 8) {
2437                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2438                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2439                 } else {
2440                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2441                         sdkp->RCD = 0;
2442                 }
2443
2444                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2445                 if (sdp->broken_fua) {
2446                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2447                         sdkp->DPOFUA = 0;
2448                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2449                         sd_first_printk(KERN_NOTICE, sdkp,
2450                                   "Uses READ/WRITE(6), disabling FUA\n");
2451                         sdkp->DPOFUA = 0;
2452                 }
2453
2454                 /* No cache flush allowed for write protected devices */
2455                 if (sdkp->WCE && sdkp->write_prot)
2456                         sdkp->WCE = 0;
2457
2458                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2459                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2460                         sd_printk(KERN_NOTICE, sdkp,
2461                                   "Write cache: %s, read cache: %s, %s\n",
2462                                   sdkp->WCE ? "enabled" : "disabled",
2463                                   sdkp->RCD ? "disabled" : "enabled",
2464                                   sdkp->DPOFUA ? "supports DPO and FUA"
2465                                   : "doesn't support DPO or FUA");
2466
2467                 return;
2468         }
2469
2470 bad_sense:
2471         if (scsi_sense_valid(&sshdr) &&
2472             sshdr.sense_key == ILLEGAL_REQUEST &&
2473             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2474                 /* Invalid field in CDB */
2475                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2476         else
2477                 sd_first_printk(KERN_ERR, sdkp,
2478                                 "Asking for cache data failed\n");
2479
2480 defaults:
2481         if (sdp->wce_default_on) {
2482                 sd_first_printk(KERN_NOTICE, sdkp,
2483                                 "Assuming drive cache: write back\n");
2484                 sdkp->WCE = 1;
2485         } else {
2486                 sd_first_printk(KERN_ERR, sdkp,
2487                                 "Assuming drive cache: write through\n");
2488                 sdkp->WCE = 0;
2489         }
2490         sdkp->RCD = 0;
2491         sdkp->DPOFUA = 0;
2492 }
2493
2494 /*
2495  * The ATO bit indicates whether the DIF application tag is available
2496  * for use by the operating system.
2497  */
2498 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2499 {
2500         int res, offset;
2501         struct scsi_device *sdp = sdkp->device;
2502         struct scsi_mode_data data;
2503         struct scsi_sense_hdr sshdr;
2504
2505         if (sdp->type != TYPE_DISK)
2506                 return;
2507
2508         if (sdkp->protection_type == 0)
2509                 return;
2510
2511         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2512                               SD_MAX_RETRIES, &data, &sshdr);
2513
2514         if (!scsi_status_is_good(res) || !data.header_length ||
2515             data.length < 6) {
2516                 sd_first_printk(KERN_WARNING, sdkp,
2517                           "getting Control mode page failed, assume no ATO\n");
2518
2519                 if (scsi_sense_valid(&sshdr))
2520                         sd_print_sense_hdr(sdkp, &sshdr);
2521
2522                 return;
2523         }
2524
2525         offset = data.header_length + data.block_descriptor_length;
2526
2527         if ((buffer[offset] & 0x3f) != 0x0a) {
2528                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2529                 return;
2530         }
2531
2532         if ((buffer[offset + 5] & 0x80) == 0)
2533                 return;
2534
2535         sdkp->ATO = 1;
2536
2537         return;
2538 }
2539
2540 /**
2541  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2542  * @disk: disk to query
2543  */
2544 static void sd_read_block_limits(struct scsi_disk *sdkp)
2545 {
2546         unsigned int sector_sz = sdkp->device->sector_size;
2547         const int vpd_len = 64;
2548         u32 max_xfer_length;
2549         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2550
2551         if (!buffer ||
2552             /* Block Limits VPD */
2553             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2554                 goto out;
2555
2556         max_xfer_length = get_unaligned_be32(&buffer[8]);
2557         if (max_xfer_length)
2558                 sdkp->max_xfer_blocks = max_xfer_length;
2559
2560         blk_queue_io_min(sdkp->disk->queue,
2561                          get_unaligned_be16(&buffer[6]) * sector_sz);
2562         blk_queue_io_opt(sdkp->disk->queue,
2563                          get_unaligned_be32(&buffer[12]) * sector_sz);
2564
2565         if (buffer[3] == 0x3c) {
2566                 unsigned int lba_count, desc_count;
2567
2568                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2569
2570                 if (!sdkp->lbpme)
2571                         goto out;
2572
2573                 lba_count = get_unaligned_be32(&buffer[20]);
2574                 desc_count = get_unaligned_be32(&buffer[24]);
2575
2576                 if (lba_count && desc_count)
2577                         sdkp->max_unmap_blocks = lba_count;
2578
2579                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2580
2581                 if (buffer[32] & 0x80)
2582                         sdkp->unmap_alignment =
2583                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2584
2585                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2586
2587                         if (sdkp->max_unmap_blocks)
2588                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2589                         else
2590                                 sd_config_discard(sdkp, SD_LBP_WS16);
2591
2592                 } else {        /* LBP VPD page tells us what to use */
2593                         if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2594                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2595                         else if (sdkp->lbpws)
2596                                 sd_config_discard(sdkp, SD_LBP_WS16);
2597                         else if (sdkp->lbpws10)
2598                                 sd_config_discard(sdkp, SD_LBP_WS10);
2599                         else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2600                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2601                         else
2602                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2603                 }
2604         }
2605
2606  out:
2607         kfree(buffer);
2608 }
2609
2610 /**
2611  * sd_read_block_characteristics - Query block dev. characteristics
2612  * @disk: disk to query
2613  */
2614 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2615 {
2616         unsigned char *buffer;
2617         u16 rot;
2618         const int vpd_len = 64;
2619
2620         buffer = kmalloc(vpd_len, GFP_KERNEL);
2621
2622         if (!buffer ||
2623             /* Block Device Characteristics VPD */
2624             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2625                 goto out;
2626
2627         rot = get_unaligned_be16(&buffer[4]);
2628
2629         if (rot == 1) {
2630                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2631                 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2632         }
2633
2634  out:
2635         kfree(buffer);
2636 }
2637
2638 /**
2639  * sd_read_block_provisioning - Query provisioning VPD page
2640  * @disk: disk to query
2641  */
2642 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2643 {
2644         unsigned char *buffer;
2645         const int vpd_len = 8;
2646
2647         if (sdkp->lbpme == 0)
2648                 return;
2649
2650         buffer = kmalloc(vpd_len, GFP_KERNEL);
2651
2652         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2653                 goto out;
2654
2655         sdkp->lbpvpd    = 1;
2656         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2657         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2658         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2659
2660  out:
2661         kfree(buffer);
2662 }
2663
2664 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2665 {
2666         struct scsi_device *sdev = sdkp->device;
2667
2668         if (sdev->host->no_write_same) {
2669                 sdev->no_write_same = 1;
2670
2671                 return;
2672         }
2673
2674         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2675                 /* too large values might cause issues with arcmsr */
2676                 int vpd_buf_len = 64;
2677
2678                 sdev->no_report_opcodes = 1;
2679
2680                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2681                  * CODES is unsupported and the device has an ATA
2682                  * Information VPD page (SAT).
2683                  */
2684                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2685                         sdev->no_write_same = 1;
2686         }
2687
2688         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2689                 sdkp->ws16 = 1;
2690
2691         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2692                 sdkp->ws10 = 1;
2693 }
2694
2695 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2696 {
2697         /* Attempt VPD inquiry if the device blacklist explicitly calls
2698          * for it.
2699          */
2700         if (sdp->try_vpd_pages)
2701                 return 1;
2702         /*
2703          * Although VPD inquiries can go to SCSI-2 type devices,
2704          * some USB ones crash on receiving them, and the pages
2705          * we currently ask for are for SPC-3 and beyond
2706          */
2707         if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2708                 return 1;
2709         return 0;
2710 }
2711
2712 /**
2713  *      sd_revalidate_disk - called the first time a new disk is seen,
2714  *      performs disk spin up, read_capacity, etc.
2715  *      @disk: struct gendisk we care about
2716  **/
2717 static int sd_revalidate_disk(struct gendisk *disk)
2718 {
2719         struct scsi_disk *sdkp = scsi_disk(disk);
2720         struct scsi_device *sdp = sdkp->device;
2721         unsigned char *buffer;
2722         unsigned int max_xfer;
2723
2724         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2725                                       "sd_revalidate_disk\n"));
2726
2727         /*
2728          * If the device is offline, don't try and read capacity or any
2729          * of the other niceties.
2730          */
2731         if (!scsi_device_online(sdp))
2732                 goto out;
2733
2734         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2735         if (!buffer) {
2736                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2737                           "allocation failure.\n");
2738                 goto out;
2739         }
2740
2741         sd_spinup_disk(sdkp);
2742
2743         /*
2744          * Without media there is no reason to ask; moreover, some devices
2745          * react badly if we do.
2746          */
2747         if (sdkp->media_present) {
2748                 sd_read_capacity(sdkp, buffer);
2749
2750                 if (sd_try_extended_inquiry(sdp)) {
2751                         sd_read_block_provisioning(sdkp);
2752                         sd_read_block_limits(sdkp);
2753                         sd_read_block_characteristics(sdkp);
2754                 }
2755
2756                 sd_read_write_protect_flag(sdkp, buffer);
2757                 sd_read_cache_type(sdkp, buffer);
2758                 sd_read_app_tag_own(sdkp, buffer);
2759                 sd_read_write_same(sdkp, buffer);
2760         }
2761
2762         sdkp->first_scan = 0;
2763
2764         /*
2765          * We now have all cache related info, determine how we deal
2766          * with flush requests.
2767          */
2768         sd_set_flush_flag(sdkp);
2769
2770         max_xfer = sdkp->max_xfer_blocks;
2771         max_xfer <<= ilog2(sdp->sector_size) - 9;
2772
2773         max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue),
2774                                 max_xfer);
2775         blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer);
2776         set_capacity(disk, sdkp->capacity);
2777         sd_config_write_same(sdkp);
2778         kfree(buffer);
2779
2780  out:
2781         return 0;
2782 }
2783
2784 /**
2785  *      sd_unlock_native_capacity - unlock native capacity
2786  *      @disk: struct gendisk to set capacity for
2787  *
2788  *      Block layer calls this function if it detects that partitions
2789  *      on @disk reach beyond the end of the device.  If the SCSI host
2790  *      implements ->unlock_native_capacity() method, it's invoked to
2791  *      give it a chance to adjust the device capacity.
2792  *
2793  *      CONTEXT:
2794  *      Defined by block layer.  Might sleep.
2795  */
2796 static void sd_unlock_native_capacity(struct gendisk *disk)
2797 {
2798         struct scsi_device *sdev = scsi_disk(disk)->device;
2799
2800         if (sdev->host->hostt->unlock_native_capacity)
2801                 sdev->host->hostt->unlock_native_capacity(sdev);
2802 }
2803
2804 /**
2805  *      sd_format_disk_name - format disk name
2806  *      @prefix: name prefix - ie. "sd" for SCSI disks
2807  *      @index: index of the disk to format name for
2808  *      @buf: output buffer
2809  *      @buflen: length of the output buffer
2810  *
2811  *      SCSI disk names starts at sda.  The 26th device is sdz and the
2812  *      27th is sdaa.  The last one for two lettered suffix is sdzz
2813  *      which is followed by sdaaa.
2814  *
2815  *      This is basically 26 base counting with one extra 'nil' entry
2816  *      at the beginning from the second digit on and can be
2817  *      determined using similar method as 26 base conversion with the
2818  *      index shifted -1 after each digit is computed.
2819  *
2820  *      CONTEXT:
2821  *      Don't care.
2822  *
2823  *      RETURNS:
2824  *      0 on success, -errno on failure.
2825  */
2826 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2827 {
2828         const int base = 'z' - 'a' + 1;
2829         char *begin = buf + strlen(prefix);
2830         char *end = buf + buflen;
2831         char *p;
2832         int unit;
2833
2834         p = end - 1;
2835         *p = '\0';
2836         unit = base;
2837         do {
2838                 if (p == begin)
2839                         return -EINVAL;
2840                 *--p = 'a' + (index % unit);
2841                 index = (index / unit) - 1;
2842         } while (index >= 0);
2843
2844         memmove(begin, p, end - p);
2845         memcpy(buf, prefix, strlen(prefix));
2846
2847         return 0;
2848 }
2849
2850 /*
2851  * The asynchronous part of sd_probe
2852  */
2853 static void sd_probe_async(void *data, async_cookie_t cookie)
2854 {
2855         struct scsi_disk *sdkp = data;
2856         struct scsi_device *sdp;
2857         struct gendisk *gd;
2858         u32 index;
2859         struct device *dev;
2860
2861         sdp = sdkp->device;
2862         gd = sdkp->disk;
2863         index = sdkp->index;
2864         dev = &sdp->sdev_gendev;
2865
2866         gd->major = sd_major((index & 0xf0) >> 4);
2867         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2868         gd->minors = SD_MINORS;
2869
2870         gd->fops = &sd_fops;
2871         gd->private_data = &sdkp->driver;
2872         gd->queue = sdkp->device->request_queue;
2873
2874         /* defaults, until the device tells us otherwise */
2875         sdp->sector_size = 512;
2876         sdkp->capacity = 0;
2877         sdkp->media_present = 1;
2878         sdkp->write_prot = 0;
2879         sdkp->cache_override = 0;
2880         sdkp->WCE = 0;
2881         sdkp->RCD = 0;
2882         sdkp->ATO = 0;
2883         sdkp->first_scan = 1;
2884         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2885
2886         sd_revalidate_disk(gd);
2887
2888         gd->driverfs_dev = &sdp->sdev_gendev;
2889         gd->flags = GENHD_FL_EXT_DEVT;
2890         if (sdp->removable) {
2891                 gd->flags |= GENHD_FL_REMOVABLE;
2892                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2893         }
2894
2895         blk_pm_runtime_init(sdp->request_queue, dev);
2896         add_disk(gd);
2897         if (sdkp->capacity)
2898                 sd_dif_config_host(sdkp);
2899
2900         sd_revalidate_disk(gd);
2901
2902         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2903                   sdp->removable ? "removable " : "");
2904         scsi_autopm_put_device(sdp);
2905         put_device(&sdkp->dev);
2906 }
2907
2908 /**
2909  *      sd_probe - called during driver initialization and whenever a
2910  *      new scsi device is attached to the system. It is called once
2911  *      for each scsi device (not just disks) present.
2912  *      @dev: pointer to device object
2913  *
2914  *      Returns 0 if successful (or not interested in this scsi device 
2915  *      (e.g. scanner)); 1 when there is an error.
2916  *
2917  *      Note: this function is invoked from the scsi mid-level.
2918  *      This function sets up the mapping between a given 
2919  *      <host,channel,id,lun> (found in sdp) and new device name 
2920  *      (e.g. /dev/sda). More precisely it is the block device major 
2921  *      and minor number that is chosen here.
2922  *
2923  *      Assume sd_probe is not re-entrant (for time being)
2924  *      Also think about sd_probe() and sd_remove() running coincidentally.
2925  **/
2926 static int sd_probe(struct device *dev)
2927 {
2928         struct scsi_device *sdp = to_scsi_device(dev);
2929         struct scsi_disk *sdkp;
2930         struct gendisk *gd;
2931         int index;
2932         int error;
2933
2934         scsi_autopm_get_device(sdp);
2935         error = -ENODEV;
2936         if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2937                 goto out;
2938
2939         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2940                                         "sd_probe\n"));
2941
2942         error = -ENOMEM;
2943         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2944         if (!sdkp)
2945                 goto out;
2946
2947         gd = alloc_disk(SD_MINORS);
2948         if (!gd)
2949                 goto out_free;
2950
2951         do {
2952                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2953                         goto out_put;
2954
2955                 spin_lock(&sd_index_lock);
2956                 error = ida_get_new(&sd_index_ida, &index);
2957                 spin_unlock(&sd_index_lock);
2958         } while (error == -EAGAIN);
2959
2960         if (error) {
2961                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2962                 goto out_put;
2963         }
2964
2965         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2966         if (error) {
2967                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2968                 goto out_free_index;
2969         }
2970
2971         sdkp->device = sdp;
2972         sdkp->driver = &sd_template;
2973         sdkp->disk = gd;
2974         sdkp->index = index;
2975         atomic_set(&sdkp->openers, 0);
2976         atomic_set(&sdkp->device->ioerr_cnt, 0);
2977
2978         if (!sdp->request_queue->rq_timeout) {
2979                 if (sdp->type != TYPE_MOD)
2980                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2981                 else
2982                         blk_queue_rq_timeout(sdp->request_queue,
2983                                              SD_MOD_TIMEOUT);
2984         }
2985
2986         device_initialize(&sdkp->dev);
2987         sdkp->dev.parent = dev;
2988         sdkp->dev.class = &sd_disk_class;
2989         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
2990
2991         error = device_add(&sdkp->dev);
2992         if (error)
2993                 goto out_free_index;
2994
2995         get_device(dev);
2996         dev_set_drvdata(dev, sdkp);
2997
2998         get_device(&sdkp->dev); /* prevent release before async_schedule */
2999         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3000
3001         return 0;
3002
3003  out_free_index:
3004         spin_lock(&sd_index_lock);
3005         ida_remove(&sd_index_ida, index);
3006         spin_unlock(&sd_index_lock);
3007  out_put:
3008         put_disk(gd);
3009  out_free:
3010         kfree(sdkp);
3011  out:
3012         scsi_autopm_put_device(sdp);
3013         return error;
3014 }
3015
3016 /**
3017  *      sd_remove - called whenever a scsi disk (previously recognized by
3018  *      sd_probe) is detached from the system. It is called (potentially
3019  *      multiple times) during sd module unload.
3020  *      @sdp: pointer to mid level scsi device object
3021  *
3022  *      Note: this function is invoked from the scsi mid-level.
3023  *      This function potentially frees up a device name (e.g. /dev/sdc)
3024  *      that could be re-used by a subsequent sd_probe().
3025  *      This function is not called when the built-in sd driver is "exit-ed".
3026  **/
3027 static int sd_remove(struct device *dev)
3028 {
3029         struct scsi_disk *sdkp;
3030         dev_t devt;
3031
3032         sdkp = dev_get_drvdata(dev);
3033         devt = disk_devt(sdkp->disk);
3034         scsi_autopm_get_device(sdkp->device);
3035
3036         async_synchronize_full_domain(&scsi_sd_pm_domain);
3037         async_synchronize_full_domain(&scsi_sd_probe_domain);
3038         device_del(&sdkp->dev);
3039         del_gendisk(sdkp->disk);
3040         sd_shutdown(dev);
3041
3042         blk_register_region(devt, SD_MINORS, NULL,
3043                             sd_default_probe, NULL, NULL);
3044
3045         mutex_lock(&sd_ref_mutex);
3046         dev_set_drvdata(dev, NULL);
3047         put_device(&sdkp->dev);
3048         mutex_unlock(&sd_ref_mutex);
3049
3050         return 0;
3051 }
3052
3053 /**
3054  *      scsi_disk_release - Called to free the scsi_disk structure
3055  *      @dev: pointer to embedded class device
3056  *
3057  *      sd_ref_mutex must be held entering this routine.  Because it is
3058  *      called on last put, you should always use the scsi_disk_get()
3059  *      scsi_disk_put() helpers which manipulate the semaphore directly
3060  *      and never do a direct put_device.
3061  **/
3062 static void scsi_disk_release(struct device *dev)
3063 {
3064         struct scsi_disk *sdkp = to_scsi_disk(dev);
3065         struct gendisk *disk = sdkp->disk;
3066         
3067         spin_lock(&sd_index_lock);
3068         ida_remove(&sd_index_ida, sdkp->index);
3069         spin_unlock(&sd_index_lock);
3070
3071         blk_integrity_unregister(disk);
3072         disk->private_data = NULL;
3073         put_disk(disk);
3074         put_device(&sdkp->device->sdev_gendev);
3075
3076         kfree(sdkp);
3077 }
3078
3079 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3080 {
3081         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3082         struct scsi_sense_hdr sshdr;
3083         struct scsi_device *sdp = sdkp->device;
3084         int res;
3085
3086         if (start)
3087                 cmd[4] |= 1;    /* START */
3088
3089         if (sdp->start_stop_pwr_cond)
3090                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3091
3092         if (!scsi_device_online(sdp))
3093                 return -ENODEV;
3094
3095         res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3096                                SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3097         if (res) {
3098                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3099                 if (driver_byte(res) & DRIVER_SENSE)
3100                         sd_print_sense_hdr(sdkp, &sshdr);
3101                 if (scsi_sense_valid(&sshdr) &&
3102                         /* 0x3a is medium not present */
3103                         sshdr.asc == 0x3a)
3104                         res = 0;
3105         }
3106
3107         /* SCSI error codes must not go to the generic layer */
3108         if (res)
3109                 return -EIO;
3110
3111         return 0;
3112 }
3113
3114 /*
3115  * Send a SYNCHRONIZE CACHE instruction down to the device through
3116  * the normal SCSI command structure.  Wait for the command to
3117  * complete.
3118  */
3119 static void sd_shutdown(struct device *dev)
3120 {
3121         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3122
3123         if (!sdkp)
3124                 return;         /* this can happen */
3125
3126         if (pm_runtime_suspended(dev))
3127                 return;
3128
3129         if (sdkp->WCE && sdkp->media_present) {
3130                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3131                 sd_sync_cache(sdkp);
3132         }
3133
3134         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3135                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3136                 sd_start_stop_device(sdkp, 0);
3137         }
3138 }
3139
3140 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3141 {
3142         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3143         int ret = 0;
3144
3145         if (!sdkp)
3146                 return 0;       /* this can happen */
3147
3148         if (sdkp->WCE && sdkp->media_present) {
3149                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3150                 ret = sd_sync_cache(sdkp);
3151                 if (ret) {
3152                         /* ignore OFFLINE device */
3153                         if (ret == -ENODEV)
3154                                 ret = 0;
3155                         goto done;
3156                 }
3157         }
3158
3159         if (sdkp->device->manage_start_stop) {
3160                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3161                 /* an error is not worth aborting a system sleep */
3162                 ret = sd_start_stop_device(sdkp, 0);
3163                 if (ignore_stop_errors)
3164                         ret = 0;
3165         }
3166
3167 done:
3168         return ret;
3169 }
3170
3171 static int sd_suspend_system(struct device *dev)
3172 {
3173         return sd_suspend_common(dev, true);
3174 }
3175
3176 static int sd_suspend_runtime(struct device *dev)
3177 {
3178         return sd_suspend_common(dev, false);
3179 }
3180
3181 static int sd_resume(struct device *dev)
3182 {
3183         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3184
3185         if (!sdkp->device->manage_start_stop)
3186                 return 0;
3187
3188         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3189         return sd_start_stop_device(sdkp, 1);
3190 }
3191
3192 /**
3193  *      init_sd - entry point for this driver (both when built in or when
3194  *      a module).
3195  *
3196  *      Note: this function registers this driver with the scsi mid-level.
3197  **/
3198 static int __init init_sd(void)
3199 {
3200         int majors = 0, i, err;
3201
3202         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3203
3204         for (i = 0; i < SD_MAJORS; i++) {
3205                 if (register_blkdev(sd_major(i), "sd") != 0)
3206                         continue;
3207                 majors++;
3208                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3209                                     sd_default_probe, NULL, NULL);
3210         }
3211
3212         if (!majors)
3213                 return -ENODEV;
3214
3215         err = class_register(&sd_disk_class);
3216         if (err)
3217                 goto err_out;
3218
3219         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3220                                          0, 0, NULL);
3221         if (!sd_cdb_cache) {
3222                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3223                 err = -ENOMEM;
3224                 goto err_out_class;
3225         }
3226
3227         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3228         if (!sd_cdb_pool) {
3229                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3230                 err = -ENOMEM;
3231                 goto err_out_cache;
3232         }
3233
3234         err = scsi_register_driver(&sd_template.gendrv);
3235         if (err)
3236                 goto err_out_driver;
3237
3238         return 0;
3239
3240 err_out_driver:
3241         mempool_destroy(sd_cdb_pool);
3242
3243 err_out_cache:
3244         kmem_cache_destroy(sd_cdb_cache);
3245
3246 err_out_class:
3247         class_unregister(&sd_disk_class);
3248 err_out:
3249         for (i = 0; i < SD_MAJORS; i++)
3250                 unregister_blkdev(sd_major(i), "sd");
3251         return err;
3252 }
3253
3254 /**
3255  *      exit_sd - exit point for this driver (when it is a module).
3256  *
3257  *      Note: this function unregisters this driver from the scsi mid-level.
3258  **/
3259 static void __exit exit_sd(void)
3260 {
3261         int i;
3262
3263         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3264
3265         scsi_unregister_driver(&sd_template.gendrv);
3266         mempool_destroy(sd_cdb_pool);
3267         kmem_cache_destroy(sd_cdb_cache);
3268
3269         class_unregister(&sd_disk_class);
3270
3271         for (i = 0; i < SD_MAJORS; i++) {
3272                 blk_unregister_region(sd_major(i), SD_MINORS);
3273                 unregister_blkdev(sd_major(i), "sd");
3274         }
3275 }
3276
3277 module_init(init_sd);
3278 module_exit(exit_sd);
3279
3280 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3281                                struct scsi_sense_hdr *sshdr)
3282 {
3283         scsi_print_sense_hdr(sdkp->device,
3284                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3285 }
3286
3287 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3288                             int result)
3289 {
3290         const char *hb_string = scsi_hostbyte_string(result);
3291         const char *db_string = scsi_driverbyte_string(result);
3292
3293         if (hb_string || db_string)
3294                 sd_printk(KERN_INFO, sdkp,
3295                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3296                           hb_string ? hb_string : "invalid",
3297                           db_string ? db_string : "invalid");
3298         else
3299                 sd_printk(KERN_INFO, sdkp,
3300                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3301                           msg, host_byte(result), driver_byte(result));
3302 }
3303