Merge tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block
[sfrench/cifs-2.6.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/blk-pm.h>
49 #include <linux/delay.h>
50 #include <linux/mutex.h>
51 #include <linux/string_helpers.h>
52 #include <linux/async.h>
53 #include <linux/slab.h>
54 #include <linux/sed-opal.h>
55 #include <linux/pm_runtime.h>
56 #include <linux/pr.h>
57 #include <linux/t10-pi.h>
58 #include <linux/uaccess.h>
59 #include <asm/unaligned.h>
60
61 #include <scsi/scsi.h>
62 #include <scsi/scsi_cmnd.h>
63 #include <scsi/scsi_dbg.h>
64 #include <scsi/scsi_device.h>
65 #include <scsi/scsi_driver.h>
66 #include <scsi/scsi_eh.h>
67 #include <scsi/scsi_host.h>
68 #include <scsi/scsi_ioctl.h>
69 #include <scsi/scsicam.h>
70
71 #include "sd.h"
72 #include "scsi_priv.h"
73 #include "scsi_logging.h"
74
75 MODULE_AUTHOR("Eric Youngdale");
76 MODULE_DESCRIPTION("SCSI disk (sd) driver");
77 MODULE_LICENSE("GPL");
78
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
95 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
96 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
97 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
98 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
99
100 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
101 #define SD_MINORS       16
102 #else
103 #define SD_MINORS       0
104 #endif
105
106 static void sd_config_discard(struct scsi_disk *, unsigned int);
107 static void sd_config_write_same(struct scsi_disk *);
108 static int  sd_revalidate_disk(struct gendisk *);
109 static void sd_unlock_native_capacity(struct gendisk *disk);
110 static int  sd_probe(struct device *);
111 static int  sd_remove(struct device *);
112 static void sd_shutdown(struct device *);
113 static int sd_suspend_system(struct device *);
114 static int sd_suspend_runtime(struct device *);
115 static int sd_resume(struct device *);
116 static void sd_rescan(struct device *);
117 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
118 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
119 static int sd_done(struct scsi_cmnd *);
120 static void sd_eh_reset(struct scsi_cmnd *);
121 static int sd_eh_action(struct scsi_cmnd *, int);
122 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
123 static void scsi_disk_release(struct device *cdev);
124 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
125 static void sd_print_result(const struct scsi_disk *, const char *, int);
126
127 static DEFINE_IDA(sd_index_ida);
128
129 /* This semaphore is used to mediate the 0->1 reference get in the
130  * face of object destruction (i.e. we can't allow a get on an
131  * object after last put) */
132 static DEFINE_MUTEX(sd_ref_mutex);
133
134 static struct kmem_cache *sd_cdb_cache;
135 static mempool_t *sd_cdb_pool;
136 static mempool_t *sd_page_pool;
137
138 static const char *sd_cache_types[] = {
139         "write through", "none", "write back",
140         "write back, no read (daft)"
141 };
142
143 static void sd_set_flush_flag(struct scsi_disk *sdkp)
144 {
145         bool wc = false, fua = false;
146
147         if (sdkp->WCE) {
148                 wc = true;
149                 if (sdkp->DPOFUA)
150                         fua = true;
151         }
152
153         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
154 }
155
156 static ssize_t
157 cache_type_store(struct device *dev, struct device_attribute *attr,
158                  const char *buf, size_t count)
159 {
160         int ct, rcd, wce, sp;
161         struct scsi_disk *sdkp = to_scsi_disk(dev);
162         struct scsi_device *sdp = sdkp->device;
163         char buffer[64];
164         char *buffer_data;
165         struct scsi_mode_data data;
166         struct scsi_sense_hdr sshdr;
167         static const char temp[] = "temporary ";
168         int len;
169
170         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
171                 /* no cache control on RBC devices; theoretically they
172                  * can do it, but there's probably so many exceptions
173                  * it's not worth the risk */
174                 return -EINVAL;
175
176         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
177                 buf += sizeof(temp) - 1;
178                 sdkp->cache_override = 1;
179         } else {
180                 sdkp->cache_override = 0;
181         }
182
183         ct = sysfs_match_string(sd_cache_types, buf);
184         if (ct < 0)
185                 return -EINVAL;
186
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         buffer_data[0] &= ~0x80;
208
209         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
210                              SD_MAX_RETRIES, &data, &sshdr)) {
211                 if (scsi_sense_valid(&sshdr))
212                         sd_print_sense_hdr(sdkp, &sshdr);
213                 return -EINVAL;
214         }
215         revalidate_disk(sdkp->disk);
216         return count;
217 }
218
219 static ssize_t
220 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
221                        char *buf)
222 {
223         struct scsi_disk *sdkp = to_scsi_disk(dev);
224         struct scsi_device *sdp = sdkp->device;
225
226         return sprintf(buf, "%u\n", sdp->manage_start_stop);
227 }
228
229 static ssize_t
230 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
231                         const char *buf, size_t count)
232 {
233         struct scsi_disk *sdkp = to_scsi_disk(dev);
234         struct scsi_device *sdp = sdkp->device;
235         bool v;
236
237         if (!capable(CAP_SYS_ADMIN))
238                 return -EACCES;
239
240         if (kstrtobool(buf, &v))
241                 return -EINVAL;
242
243         sdp->manage_start_stop = v;
244
245         return count;
246 }
247 static DEVICE_ATTR_RW(manage_start_stop);
248
249 static ssize_t
250 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
251 {
252         struct scsi_disk *sdkp = to_scsi_disk(dev);
253
254         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
255 }
256
257 static ssize_t
258 allow_restart_store(struct device *dev, struct device_attribute *attr,
259                     const char *buf, size_t count)
260 {
261         bool v;
262         struct scsi_disk *sdkp = to_scsi_disk(dev);
263         struct scsi_device *sdp = sdkp->device;
264
265         if (!capable(CAP_SYS_ADMIN))
266                 return -EACCES;
267
268         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
269                 return -EINVAL;
270
271         if (kstrtobool(buf, &v))
272                 return -EINVAL;
273
274         sdp->allow_restart = v;
275
276         return count;
277 }
278 static DEVICE_ATTR_RW(allow_restart);
279
280 static ssize_t
281 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
282 {
283         struct scsi_disk *sdkp = to_scsi_disk(dev);
284         int ct = sdkp->RCD + 2*sdkp->WCE;
285
286         return sprintf(buf, "%s\n", sd_cache_types[ct]);
287 }
288 static DEVICE_ATTR_RW(cache_type);
289
290 static ssize_t
291 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
292 {
293         struct scsi_disk *sdkp = to_scsi_disk(dev);
294
295         return sprintf(buf, "%u\n", sdkp->DPOFUA);
296 }
297 static DEVICE_ATTR_RO(FUA);
298
299 static ssize_t
300 protection_type_show(struct device *dev, struct device_attribute *attr,
301                      char *buf)
302 {
303         struct scsi_disk *sdkp = to_scsi_disk(dev);
304
305         return sprintf(buf, "%u\n", sdkp->protection_type);
306 }
307
308 static ssize_t
309 protection_type_store(struct device *dev, struct device_attribute *attr,
310                       const char *buf, size_t count)
311 {
312         struct scsi_disk *sdkp = to_scsi_disk(dev);
313         unsigned int val;
314         int err;
315
316         if (!capable(CAP_SYS_ADMIN))
317                 return -EACCES;
318
319         err = kstrtouint(buf, 10, &val);
320
321         if (err)
322                 return err;
323
324         if (val <= T10_PI_TYPE3_PROTECTION)
325                 sdkp->protection_type = val;
326
327         return count;
328 }
329 static DEVICE_ATTR_RW(protection_type);
330
331 static ssize_t
332 protection_mode_show(struct device *dev, struct device_attribute *attr,
333                      char *buf)
334 {
335         struct scsi_disk *sdkp = to_scsi_disk(dev);
336         struct scsi_device *sdp = sdkp->device;
337         unsigned int dif, dix;
338
339         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
340         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
341
342         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
343                 dif = 0;
344                 dix = 1;
345         }
346
347         if (!dif && !dix)
348                 return sprintf(buf, "none\n");
349
350         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
351 }
352 static DEVICE_ATTR_RO(protection_mode);
353
354 static ssize_t
355 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
356 {
357         struct scsi_disk *sdkp = to_scsi_disk(dev);
358
359         return sprintf(buf, "%u\n", sdkp->ATO);
360 }
361 static DEVICE_ATTR_RO(app_tag_own);
362
363 static ssize_t
364 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
365                        char *buf)
366 {
367         struct scsi_disk *sdkp = to_scsi_disk(dev);
368
369         return sprintf(buf, "%u\n", sdkp->lbpme);
370 }
371 static DEVICE_ATTR_RO(thin_provisioning);
372
373 /* sysfs_match_string() requires dense arrays */
374 static const char *lbp_mode[] = {
375         [SD_LBP_FULL]           = "full",
376         [SD_LBP_UNMAP]          = "unmap",
377         [SD_LBP_WS16]           = "writesame_16",
378         [SD_LBP_WS10]           = "writesame_10",
379         [SD_LBP_ZERO]           = "writesame_zero",
380         [SD_LBP_DISABLE]        = "disabled",
381 };
382
383 static ssize_t
384 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
385                        char *buf)
386 {
387         struct scsi_disk *sdkp = to_scsi_disk(dev);
388
389         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
390 }
391
392 static ssize_t
393 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
394                         const char *buf, size_t count)
395 {
396         struct scsi_disk *sdkp = to_scsi_disk(dev);
397         struct scsi_device *sdp = sdkp->device;
398         int mode;
399
400         if (!capable(CAP_SYS_ADMIN))
401                 return -EACCES;
402
403         if (sd_is_zoned(sdkp)) {
404                 sd_config_discard(sdkp, SD_LBP_DISABLE);
405                 return count;
406         }
407
408         if (sdp->type != TYPE_DISK)
409                 return -EINVAL;
410
411         mode = sysfs_match_string(lbp_mode, buf);
412         if (mode < 0)
413                 return -EINVAL;
414
415         sd_config_discard(sdkp, mode);
416
417         return count;
418 }
419 static DEVICE_ATTR_RW(provisioning_mode);
420
421 /* sysfs_match_string() requires dense arrays */
422 static const char *zeroing_mode[] = {
423         [SD_ZERO_WRITE]         = "write",
424         [SD_ZERO_WS]            = "writesame",
425         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
426         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
427 };
428
429 static ssize_t
430 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
431                   char *buf)
432 {
433         struct scsi_disk *sdkp = to_scsi_disk(dev);
434
435         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
436 }
437
438 static ssize_t
439 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
440                    const char *buf, size_t count)
441 {
442         struct scsi_disk *sdkp = to_scsi_disk(dev);
443         int mode;
444
445         if (!capable(CAP_SYS_ADMIN))
446                 return -EACCES;
447
448         mode = sysfs_match_string(zeroing_mode, buf);
449         if (mode < 0)
450                 return -EINVAL;
451
452         sdkp->zeroing_mode = mode;
453
454         return count;
455 }
456 static DEVICE_ATTR_RW(zeroing_mode);
457
458 static ssize_t
459 max_medium_access_timeouts_show(struct device *dev,
460                                 struct device_attribute *attr, char *buf)
461 {
462         struct scsi_disk *sdkp = to_scsi_disk(dev);
463
464         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
465 }
466
467 static ssize_t
468 max_medium_access_timeouts_store(struct device *dev,
469                                  struct device_attribute *attr, const char *buf,
470                                  size_t count)
471 {
472         struct scsi_disk *sdkp = to_scsi_disk(dev);
473         int err;
474
475         if (!capable(CAP_SYS_ADMIN))
476                 return -EACCES;
477
478         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
479
480         return err ? err : count;
481 }
482 static DEVICE_ATTR_RW(max_medium_access_timeouts);
483
484 static ssize_t
485 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
486                            char *buf)
487 {
488         struct scsi_disk *sdkp = to_scsi_disk(dev);
489
490         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
491 }
492
493 static ssize_t
494 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
495                             const char *buf, size_t count)
496 {
497         struct scsi_disk *sdkp = to_scsi_disk(dev);
498         struct scsi_device *sdp = sdkp->device;
499         unsigned long max;
500         int err;
501
502         if (!capable(CAP_SYS_ADMIN))
503                 return -EACCES;
504
505         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
506                 return -EINVAL;
507
508         err = kstrtoul(buf, 10, &max);
509
510         if (err)
511                 return err;
512
513         if (max == 0)
514                 sdp->no_write_same = 1;
515         else if (max <= SD_MAX_WS16_BLOCKS) {
516                 sdp->no_write_same = 0;
517                 sdkp->max_ws_blocks = max;
518         }
519
520         sd_config_write_same(sdkp);
521
522         return count;
523 }
524 static DEVICE_ATTR_RW(max_write_same_blocks);
525
526 static struct attribute *sd_disk_attrs[] = {
527         &dev_attr_cache_type.attr,
528         &dev_attr_FUA.attr,
529         &dev_attr_allow_restart.attr,
530         &dev_attr_manage_start_stop.attr,
531         &dev_attr_protection_type.attr,
532         &dev_attr_protection_mode.attr,
533         &dev_attr_app_tag_own.attr,
534         &dev_attr_thin_provisioning.attr,
535         &dev_attr_provisioning_mode.attr,
536         &dev_attr_zeroing_mode.attr,
537         &dev_attr_max_write_same_blocks.attr,
538         &dev_attr_max_medium_access_timeouts.attr,
539         NULL,
540 };
541 ATTRIBUTE_GROUPS(sd_disk);
542
543 static struct class sd_disk_class = {
544         .name           = "scsi_disk",
545         .owner          = THIS_MODULE,
546         .dev_release    = scsi_disk_release,
547         .dev_groups     = sd_disk_groups,
548 };
549
550 static const struct dev_pm_ops sd_pm_ops = {
551         .suspend                = sd_suspend_system,
552         .resume                 = sd_resume,
553         .poweroff               = sd_suspend_system,
554         .restore                = sd_resume,
555         .runtime_suspend        = sd_suspend_runtime,
556         .runtime_resume         = sd_resume,
557 };
558
559 static struct scsi_driver sd_template = {
560         .gendrv = {
561                 .name           = "sd",
562                 .owner          = THIS_MODULE,
563                 .probe          = sd_probe,
564                 .remove         = sd_remove,
565                 .shutdown       = sd_shutdown,
566                 .pm             = &sd_pm_ops,
567         },
568         .rescan                 = sd_rescan,
569         .init_command           = sd_init_command,
570         .uninit_command         = sd_uninit_command,
571         .done                   = sd_done,
572         .eh_action              = sd_eh_action,
573         .eh_reset               = sd_eh_reset,
574 };
575
576 /*
577  * Dummy kobj_map->probe function.
578  * The default ->probe function will call modprobe, which is
579  * pointless as this module is already loaded.
580  */
581 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
582 {
583         return NULL;
584 }
585
586 /*
587  * Device no to disk mapping:
588  * 
589  *       major         disc2     disc  p1
590  *   |............|.............|....|....| <- dev_t
591  *    31        20 19          8 7  4 3  0
592  * 
593  * Inside a major, we have 16k disks, however mapped non-
594  * contiguously. The first 16 disks are for major0, the next
595  * ones with major1, ... Disk 256 is for major0 again, disk 272 
596  * for major1, ... 
597  * As we stay compatible with our numbering scheme, we can reuse 
598  * the well-know SCSI majors 8, 65--71, 136--143.
599  */
600 static int sd_major(int major_idx)
601 {
602         switch (major_idx) {
603         case 0:
604                 return SCSI_DISK0_MAJOR;
605         case 1 ... 7:
606                 return SCSI_DISK1_MAJOR + major_idx - 1;
607         case 8 ... 15:
608                 return SCSI_DISK8_MAJOR + major_idx - 8;
609         default:
610                 BUG();
611                 return 0;       /* shut up gcc */
612         }
613 }
614
615 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
616 {
617         struct scsi_disk *sdkp = NULL;
618
619         mutex_lock(&sd_ref_mutex);
620
621         if (disk->private_data) {
622                 sdkp = scsi_disk(disk);
623                 if (scsi_device_get(sdkp->device) == 0)
624                         get_device(&sdkp->dev);
625                 else
626                         sdkp = NULL;
627         }
628         mutex_unlock(&sd_ref_mutex);
629         return sdkp;
630 }
631
632 static void scsi_disk_put(struct scsi_disk *sdkp)
633 {
634         struct scsi_device *sdev = sdkp->device;
635
636         mutex_lock(&sd_ref_mutex);
637         put_device(&sdkp->dev);
638         scsi_device_put(sdev);
639         mutex_unlock(&sd_ref_mutex);
640 }
641
642 #ifdef CONFIG_BLK_SED_OPAL
643 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
644                 size_t len, bool send)
645 {
646         struct scsi_device *sdev = data;
647         u8 cdb[12] = { 0, };
648         int ret;
649
650         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
651         cdb[1] = secp;
652         put_unaligned_be16(spsp, &cdb[2]);
653         put_unaligned_be32(len, &cdb[6]);
654
655         ret = scsi_execute_req(sdev, cdb,
656                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
657                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
658         return ret <= 0 ? ret : -EIO;
659 }
660 #endif /* CONFIG_BLK_SED_OPAL */
661
662 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
663                                            unsigned int dix, unsigned int dif)
664 {
665         struct bio *bio = scmd->request->bio;
666         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
667         unsigned int protect = 0;
668
669         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
670                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
671                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
672
673                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
674                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
675         }
676
677         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
678                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
679
680                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
681                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
682         }
683
684         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
685                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
686
687                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
688                         protect = 3 << 5;       /* Disable target PI checking */
689                 else
690                         protect = 1 << 5;       /* Enable target PI checking */
691         }
692
693         scsi_set_prot_op(scmd, prot_op);
694         scsi_set_prot_type(scmd, dif);
695         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
696
697         return protect;
698 }
699
700 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
701 {
702         struct request_queue *q = sdkp->disk->queue;
703         unsigned int logical_block_size = sdkp->device->sector_size;
704         unsigned int max_blocks = 0;
705
706         q->limits.discard_alignment =
707                 sdkp->unmap_alignment * logical_block_size;
708         q->limits.discard_granularity =
709                 max(sdkp->physical_block_size,
710                     sdkp->unmap_granularity * logical_block_size);
711         sdkp->provisioning_mode = mode;
712
713         switch (mode) {
714
715         case SD_LBP_FULL:
716         case SD_LBP_DISABLE:
717                 blk_queue_max_discard_sectors(q, 0);
718                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
719                 return;
720
721         case SD_LBP_UNMAP:
722                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
723                                           (u32)SD_MAX_WS16_BLOCKS);
724                 break;
725
726         case SD_LBP_WS16:
727                 if (sdkp->device->unmap_limit_for_ws)
728                         max_blocks = sdkp->max_unmap_blocks;
729                 else
730                         max_blocks = sdkp->max_ws_blocks;
731
732                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
733                 break;
734
735         case SD_LBP_WS10:
736                 if (sdkp->device->unmap_limit_for_ws)
737                         max_blocks = sdkp->max_unmap_blocks;
738                 else
739                         max_blocks = sdkp->max_ws_blocks;
740
741                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
742                 break;
743
744         case SD_LBP_ZERO:
745                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
746                                           (u32)SD_MAX_WS10_BLOCKS);
747                 break;
748         }
749
750         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
751         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
752 }
753
754 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
755 {
756         struct scsi_device *sdp = cmd->device;
757         struct request *rq = cmd->request;
758         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
759         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
760         unsigned int data_len = 24;
761         char *buf;
762
763         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
764         if (!rq->special_vec.bv_page)
765                 return BLK_STS_RESOURCE;
766         clear_highpage(rq->special_vec.bv_page);
767         rq->special_vec.bv_offset = 0;
768         rq->special_vec.bv_len = data_len;
769         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
770
771         cmd->cmd_len = 10;
772         cmd->cmnd[0] = UNMAP;
773         cmd->cmnd[8] = 24;
774
775         buf = page_address(rq->special_vec.bv_page);
776         put_unaligned_be16(6 + 16, &buf[0]);
777         put_unaligned_be16(16, &buf[2]);
778         put_unaligned_be64(sector, &buf[8]);
779         put_unaligned_be32(nr_sectors, &buf[16]);
780
781         cmd->allowed = SD_MAX_RETRIES;
782         cmd->transfersize = data_len;
783         rq->timeout = SD_TIMEOUT;
784         scsi_req(rq)->resid_len = data_len;
785
786         return scsi_init_io(cmd);
787 }
788
789 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
790                 bool unmap)
791 {
792         struct scsi_device *sdp = cmd->device;
793         struct request *rq = cmd->request;
794         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
795         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
796         u32 data_len = sdp->sector_size;
797
798         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
799         if (!rq->special_vec.bv_page)
800                 return BLK_STS_RESOURCE;
801         clear_highpage(rq->special_vec.bv_page);
802         rq->special_vec.bv_offset = 0;
803         rq->special_vec.bv_len = data_len;
804         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
805
806         cmd->cmd_len = 16;
807         cmd->cmnd[0] = WRITE_SAME_16;
808         if (unmap)
809                 cmd->cmnd[1] = 0x8; /* UNMAP */
810         put_unaligned_be64(sector, &cmd->cmnd[2]);
811         put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
812
813         cmd->allowed = SD_MAX_RETRIES;
814         cmd->transfersize = data_len;
815         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
816         scsi_req(rq)->resid_len = data_len;
817
818         return scsi_init_io(cmd);
819 }
820
821 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
822                 bool unmap)
823 {
824         struct scsi_device *sdp = cmd->device;
825         struct request *rq = cmd->request;
826         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
827         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
828         u32 data_len = sdp->sector_size;
829
830         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
831         if (!rq->special_vec.bv_page)
832                 return BLK_STS_RESOURCE;
833         clear_highpage(rq->special_vec.bv_page);
834         rq->special_vec.bv_offset = 0;
835         rq->special_vec.bv_len = data_len;
836         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
837
838         cmd->cmd_len = 10;
839         cmd->cmnd[0] = WRITE_SAME;
840         if (unmap)
841                 cmd->cmnd[1] = 0x8; /* UNMAP */
842         put_unaligned_be32(sector, &cmd->cmnd[2]);
843         put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
844
845         cmd->allowed = SD_MAX_RETRIES;
846         cmd->transfersize = data_len;
847         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
848         scsi_req(rq)->resid_len = data_len;
849
850         return scsi_init_io(cmd);
851 }
852
853 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
854 {
855         struct request *rq = cmd->request;
856         struct scsi_device *sdp = cmd->device;
857         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
858         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
859         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
860
861         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
862                 switch (sdkp->zeroing_mode) {
863                 case SD_ZERO_WS16_UNMAP:
864                         return sd_setup_write_same16_cmnd(cmd, true);
865                 case SD_ZERO_WS10_UNMAP:
866                         return sd_setup_write_same10_cmnd(cmd, true);
867                 }
868         }
869
870         if (sdp->no_write_same)
871                 return BLK_STS_TARGET;
872
873         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
874                 return sd_setup_write_same16_cmnd(cmd, false);
875
876         return sd_setup_write_same10_cmnd(cmd, false);
877 }
878
879 static void sd_config_write_same(struct scsi_disk *sdkp)
880 {
881         struct request_queue *q = sdkp->disk->queue;
882         unsigned int logical_block_size = sdkp->device->sector_size;
883
884         if (sdkp->device->no_write_same) {
885                 sdkp->max_ws_blocks = 0;
886                 goto out;
887         }
888
889         /* Some devices can not handle block counts above 0xffff despite
890          * supporting WRITE SAME(16). Consequently we default to 64k
891          * blocks per I/O unless the device explicitly advertises a
892          * bigger limit.
893          */
894         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
895                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
896                                                    (u32)SD_MAX_WS16_BLOCKS);
897         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
898                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
899                                                    (u32)SD_MAX_WS10_BLOCKS);
900         else {
901                 sdkp->device->no_write_same = 1;
902                 sdkp->max_ws_blocks = 0;
903         }
904
905         if (sdkp->lbprz && sdkp->lbpws)
906                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
907         else if (sdkp->lbprz && sdkp->lbpws10)
908                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
909         else if (sdkp->max_ws_blocks)
910                 sdkp->zeroing_mode = SD_ZERO_WS;
911         else
912                 sdkp->zeroing_mode = SD_ZERO_WRITE;
913
914         if (sdkp->max_ws_blocks &&
915             sdkp->physical_block_size > logical_block_size) {
916                 /*
917                  * Reporting a maximum number of blocks that is not aligned
918                  * on the device physical size would cause a large write same
919                  * request to be split into physically unaligned chunks by
920                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
921                  * even if the caller of these functions took care to align the
922                  * large request. So make sure the maximum reported is aligned
923                  * to the device physical block size. This is only an optional
924                  * optimization for regular disks, but this is mandatory to
925                  * avoid failure of large write same requests directed at
926                  * sequential write required zones of host-managed ZBC disks.
927                  */
928                 sdkp->max_ws_blocks =
929                         round_down(sdkp->max_ws_blocks,
930                                    bytes_to_logical(sdkp->device,
931                                                     sdkp->physical_block_size));
932         }
933
934 out:
935         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
936                                          (logical_block_size >> 9));
937         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
938                                          (logical_block_size >> 9));
939 }
940
941 /**
942  * sd_setup_write_same_cmnd - write the same data to multiple blocks
943  * @cmd: command to prepare
944  *
945  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
946  * the preference indicated by the target device.
947  **/
948 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
949 {
950         struct request *rq = cmd->request;
951         struct scsi_device *sdp = cmd->device;
952         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
953         struct bio *bio = rq->bio;
954         sector_t sector = blk_rq_pos(rq);
955         unsigned int nr_sectors = blk_rq_sectors(rq);
956         unsigned int nr_bytes = blk_rq_bytes(rq);
957         blk_status_t ret;
958
959         if (sdkp->device->no_write_same)
960                 return BLK_STS_TARGET;
961
962         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
963
964         sector >>= ilog2(sdp->sector_size) - 9;
965         nr_sectors >>= ilog2(sdp->sector_size) - 9;
966
967         rq->timeout = SD_WRITE_SAME_TIMEOUT;
968
969         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
970                 cmd->cmd_len = 16;
971                 cmd->cmnd[0] = WRITE_SAME_16;
972                 put_unaligned_be64(sector, &cmd->cmnd[2]);
973                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
974         } else {
975                 cmd->cmd_len = 10;
976                 cmd->cmnd[0] = WRITE_SAME;
977                 put_unaligned_be32(sector, &cmd->cmnd[2]);
978                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
979         }
980
981         cmd->transfersize = sdp->sector_size;
982         cmd->allowed = SD_MAX_RETRIES;
983
984         /*
985          * For WRITE SAME the data transferred via the DATA OUT buffer is
986          * different from the amount of data actually written to the target.
987          *
988          * We set up __data_len to the amount of data transferred via the
989          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
990          * to transfer a single sector of data first, but then reset it to
991          * the amount of data to be written right after so that the I/O path
992          * knows how much to actually write.
993          */
994         rq->__data_len = sdp->sector_size;
995         ret = scsi_init_io(cmd);
996         rq->__data_len = nr_bytes;
997
998         return ret;
999 }
1000
1001 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1002 {
1003         struct request *rq = cmd->request;
1004
1005         /* flush requests don't perform I/O, zero the S/G table */
1006         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1007
1008         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1009         cmd->cmd_len = 10;
1010         cmd->transfersize = 0;
1011         cmd->allowed = SD_MAX_RETRIES;
1012
1013         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1014         return BLK_STS_OK;
1015 }
1016
1017 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1018 {
1019         struct request *rq = SCpnt->request;
1020         struct scsi_device *sdp = SCpnt->device;
1021         struct gendisk *disk = rq->rq_disk;
1022         struct scsi_disk *sdkp = scsi_disk(disk);
1023         sector_t block = blk_rq_pos(rq);
1024         sector_t threshold;
1025         unsigned int this_count = blk_rq_sectors(rq);
1026         unsigned int dif, dix;
1027         unsigned char protect;
1028         blk_status_t ret;
1029
1030         ret = scsi_init_io(SCpnt);
1031         if (ret != BLK_STS_OK)
1032                 return ret;
1033         WARN_ON_ONCE(SCpnt != rq->special);
1034
1035         SCSI_LOG_HLQUEUE(1,
1036                 scmd_printk(KERN_INFO, SCpnt,
1037                         "%s: block=%llu, count=%d\n",
1038                         __func__, (unsigned long long)block, this_count));
1039
1040         if (!sdp || !scsi_device_online(sdp) ||
1041             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1042                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1043                                                 "Finishing %u sectors\n",
1044                                                 blk_rq_sectors(rq)));
1045                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1046                                                 "Retry with 0x%p\n", SCpnt));
1047                 return BLK_STS_IOERR;
1048         }
1049
1050         if (sdp->changed) {
1051                 /*
1052                  * quietly refuse to do anything to a changed disc until 
1053                  * the changed bit has been reset
1054                  */
1055                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1056                 return BLK_STS_IOERR;
1057         }
1058
1059         /*
1060          * Some SD card readers can't handle multi-sector accesses which touch
1061          * the last one or two hardware sectors.  Split accesses as needed.
1062          */
1063         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1064                 (sdp->sector_size / 512);
1065
1066         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1067                 if (block < threshold) {
1068                         /* Access up to the threshold but not beyond */
1069                         this_count = threshold - block;
1070                 } else {
1071                         /* Access only a single hardware sector */
1072                         this_count = sdp->sector_size / 512;
1073                 }
1074         }
1075
1076         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1077                                         (unsigned long long)block));
1078
1079         /*
1080          * If we have a 1K hardware sectorsize, prevent access to single
1081          * 512 byte sectors.  In theory we could handle this - in fact
1082          * the scsi cdrom driver must be able to handle this because
1083          * we typically use 1K blocksizes, and cdroms typically have
1084          * 2K hardware sectorsizes.  Of course, things are simpler
1085          * with the cdrom, since it is read-only.  For performance
1086          * reasons, the filesystems should be able to handle this
1087          * and not force the scsi disk driver to use bounce buffers
1088          * for this.
1089          */
1090         if (sdp->sector_size == 1024) {
1091                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1092                         scmd_printk(KERN_ERR, SCpnt,
1093                                     "Bad block number requested\n");
1094                         return BLK_STS_IOERR;
1095                 }
1096                 block = block >> 1;
1097                 this_count = this_count >> 1;
1098         }
1099         if (sdp->sector_size == 2048) {
1100                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1101                         scmd_printk(KERN_ERR, SCpnt,
1102                                     "Bad block number requested\n");
1103                         return BLK_STS_IOERR;
1104                 }
1105                 block = block >> 2;
1106                 this_count = this_count >> 2;
1107         }
1108         if (sdp->sector_size == 4096) {
1109                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1110                         scmd_printk(KERN_ERR, SCpnt,
1111                                     "Bad block number requested\n");
1112                         return BLK_STS_IOERR;
1113                 }
1114                 block = block >> 3;
1115                 this_count = this_count >> 3;
1116         }
1117         if (rq_data_dir(rq) == WRITE) {
1118                 SCpnt->cmnd[0] = WRITE_6;
1119
1120                 if (blk_integrity_rq(rq))
1121                         t10_pi_prepare(SCpnt->request, sdkp->protection_type);
1122
1123         } else if (rq_data_dir(rq) == READ) {
1124                 SCpnt->cmnd[0] = READ_6;
1125         } else {
1126                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1127                 return BLK_STS_IOERR;
1128         }
1129
1130         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1131                                         "%s %d/%u 512 byte blocks.\n",
1132                                         (rq_data_dir(rq) == WRITE) ?
1133                                         "writing" : "reading", this_count,
1134                                         blk_rq_sectors(rq)));
1135
1136         dix = scsi_prot_sg_count(SCpnt);
1137         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1138
1139         if (dif || dix)
1140                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1141         else
1142                 protect = 0;
1143
1144         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1145                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1146
1147                 if (unlikely(!SCpnt->cmnd))
1148                         return BLK_STS_RESOURCE;
1149
1150                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1151                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1152                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1153                 SCpnt->cmnd[7] = 0x18;
1154                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1155                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1156
1157                 /* LBA */
1158                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1159                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1160                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1161                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1162                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1163                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1164                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1165                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1166
1167                 /* Expected Indirect LBA */
1168                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1169                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1170                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1171                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1172
1173                 /* Transfer length */
1174                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1175                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1176                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1177                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1178         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1179                 SCpnt->cmnd[0] += READ_16 - READ_6;
1180                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1181                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1182                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1183                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1184                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1185                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1186                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1187                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1188                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1189                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1190                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1191                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1192                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1193                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1194         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1195                    scsi_device_protection(SCpnt->device) ||
1196                    SCpnt->device->use_10_for_rw) {
1197                 SCpnt->cmnd[0] += READ_10 - READ_6;
1198                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1199                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1200                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1201                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1202                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1203                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1204                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1205                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1206         } else {
1207                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1208                         /*
1209                          * This happens only if this drive failed
1210                          * 10byte rw command with ILLEGAL_REQUEST
1211                          * during operation and thus turned off
1212                          * use_10_for_rw.
1213                          */
1214                         scmd_printk(KERN_ERR, SCpnt,
1215                                     "FUA write on READ/WRITE(6) drive\n");
1216                         return BLK_STS_IOERR;
1217                 }
1218
1219                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1220                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1221                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1222                 SCpnt->cmnd[4] = (unsigned char) this_count;
1223                 SCpnt->cmnd[5] = 0;
1224         }
1225         SCpnt->sdb.length = this_count * sdp->sector_size;
1226
1227         /*
1228          * We shouldn't disconnect in the middle of a sector, so with a dumb
1229          * host adapter, it's safe to assume that we can at least transfer
1230          * this many bytes between each connect / disconnect.
1231          */
1232         SCpnt->transfersize = sdp->sector_size;
1233         SCpnt->underflow = this_count << 9;
1234         SCpnt->allowed = SD_MAX_RETRIES;
1235
1236         /*
1237          * This indicates that the command is ready from our end to be
1238          * queued.
1239          */
1240         return BLK_STS_OK;
1241 }
1242
1243 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1244 {
1245         struct request *rq = cmd->request;
1246
1247         switch (req_op(rq)) {
1248         case REQ_OP_DISCARD:
1249                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1250                 case SD_LBP_UNMAP:
1251                         return sd_setup_unmap_cmnd(cmd);
1252                 case SD_LBP_WS16:
1253                         return sd_setup_write_same16_cmnd(cmd, true);
1254                 case SD_LBP_WS10:
1255                         return sd_setup_write_same10_cmnd(cmd, true);
1256                 case SD_LBP_ZERO:
1257                         return sd_setup_write_same10_cmnd(cmd, false);
1258                 default:
1259                         return BLK_STS_TARGET;
1260                 }
1261         case REQ_OP_WRITE_ZEROES:
1262                 return sd_setup_write_zeroes_cmnd(cmd);
1263         case REQ_OP_WRITE_SAME:
1264                 return sd_setup_write_same_cmnd(cmd);
1265         case REQ_OP_FLUSH:
1266                 return sd_setup_flush_cmnd(cmd);
1267         case REQ_OP_READ:
1268         case REQ_OP_WRITE:
1269                 return sd_setup_read_write_cmnd(cmd);
1270         case REQ_OP_ZONE_RESET:
1271                 return sd_zbc_setup_reset_cmnd(cmd);
1272         default:
1273                 WARN_ON_ONCE(1);
1274                 return BLK_STS_NOTSUPP;
1275         }
1276 }
1277
1278 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1279 {
1280         struct request *rq = SCpnt->request;
1281         u8 *cmnd;
1282
1283         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1284                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1285
1286         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1287                 cmnd = SCpnt->cmnd;
1288                 SCpnt->cmnd = NULL;
1289                 SCpnt->cmd_len = 0;
1290                 mempool_free(cmnd, sd_cdb_pool);
1291         }
1292 }
1293
1294 /**
1295  *      sd_open - open a scsi disk device
1296  *      @bdev: Block device of the scsi disk to open
1297  *      @mode: FMODE_* mask
1298  *
1299  *      Returns 0 if successful. Returns a negated errno value in case 
1300  *      of error.
1301  *
1302  *      Note: This can be called from a user context (e.g. fsck(1) )
1303  *      or from within the kernel (e.g. as a result of a mount(1) ).
1304  *      In the latter case @inode and @filp carry an abridged amount
1305  *      of information as noted above.
1306  *
1307  *      Locking: called with bdev->bd_mutex held.
1308  **/
1309 static int sd_open(struct block_device *bdev, fmode_t mode)
1310 {
1311         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1312         struct scsi_device *sdev;
1313         int retval;
1314
1315         if (!sdkp)
1316                 return -ENXIO;
1317
1318         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1319
1320         sdev = sdkp->device;
1321
1322         /*
1323          * If the device is in error recovery, wait until it is done.
1324          * If the device is offline, then disallow any access to it.
1325          */
1326         retval = -ENXIO;
1327         if (!scsi_block_when_processing_errors(sdev))
1328                 goto error_out;
1329
1330         if (sdev->removable || sdkp->write_prot)
1331                 check_disk_change(bdev);
1332
1333         /*
1334          * If the drive is empty, just let the open fail.
1335          */
1336         retval = -ENOMEDIUM;
1337         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1338                 goto error_out;
1339
1340         /*
1341          * If the device has the write protect tab set, have the open fail
1342          * if the user expects to be able to write to the thing.
1343          */
1344         retval = -EROFS;
1345         if (sdkp->write_prot && (mode & FMODE_WRITE))
1346                 goto error_out;
1347
1348         /*
1349          * It is possible that the disk changing stuff resulted in
1350          * the device being taken offline.  If this is the case,
1351          * report this to the user, and don't pretend that the
1352          * open actually succeeded.
1353          */
1354         retval = -ENXIO;
1355         if (!scsi_device_online(sdev))
1356                 goto error_out;
1357
1358         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1359                 if (scsi_block_when_processing_errors(sdev))
1360                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1361         }
1362
1363         return 0;
1364
1365 error_out:
1366         scsi_disk_put(sdkp);
1367         return retval;  
1368 }
1369
1370 /**
1371  *      sd_release - invoked when the (last) close(2) is called on this
1372  *      scsi disk.
1373  *      @disk: disk to release
1374  *      @mode: FMODE_* mask
1375  *
1376  *      Returns 0. 
1377  *
1378  *      Note: may block (uninterruptible) if error recovery is underway
1379  *      on this disk.
1380  *
1381  *      Locking: called with bdev->bd_mutex held.
1382  **/
1383 static void sd_release(struct gendisk *disk, fmode_t mode)
1384 {
1385         struct scsi_disk *sdkp = scsi_disk(disk);
1386         struct scsi_device *sdev = sdkp->device;
1387
1388         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1389
1390         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1391                 if (scsi_block_when_processing_errors(sdev))
1392                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1393         }
1394
1395         /*
1396          * XXX and what if there are packets in flight and this close()
1397          * XXX is followed by a "rmmod sd_mod"?
1398          */
1399
1400         scsi_disk_put(sdkp);
1401 }
1402
1403 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1404 {
1405         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1406         struct scsi_device *sdp = sdkp->device;
1407         struct Scsi_Host *host = sdp->host;
1408         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1409         int diskinfo[4];
1410
1411         /* default to most commonly used values */
1412         diskinfo[0] = 0x40;     /* 1 << 6 */
1413         diskinfo[1] = 0x20;     /* 1 << 5 */
1414         diskinfo[2] = capacity >> 11;
1415
1416         /* override with calculated, extended default, or driver values */
1417         if (host->hostt->bios_param)
1418                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1419         else
1420                 scsicam_bios_param(bdev, capacity, diskinfo);
1421
1422         geo->heads = diskinfo[0];
1423         geo->sectors = diskinfo[1];
1424         geo->cylinders = diskinfo[2];
1425         return 0;
1426 }
1427
1428 /**
1429  *      sd_ioctl - process an ioctl
1430  *      @bdev: target block device
1431  *      @mode: FMODE_* mask
1432  *      @cmd: ioctl command number
1433  *      @arg: this is third argument given to ioctl(2) system call.
1434  *      Often contains a pointer.
1435  *
1436  *      Returns 0 if successful (some ioctls return positive numbers on
1437  *      success as well). Returns a negated errno value in case of error.
1438  *
1439  *      Note: most ioctls are forward onto the block subsystem or further
1440  *      down in the scsi subsystem.
1441  **/
1442 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1443                     unsigned int cmd, unsigned long arg)
1444 {
1445         struct gendisk *disk = bdev->bd_disk;
1446         struct scsi_disk *sdkp = scsi_disk(disk);
1447         struct scsi_device *sdp = sdkp->device;
1448         void __user *p = (void __user *)arg;
1449         int error;
1450     
1451         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1452                                     "cmd=0x%x\n", disk->disk_name, cmd));
1453
1454         error = scsi_verify_blk_ioctl(bdev, cmd);
1455         if (error < 0)
1456                 return error;
1457
1458         /*
1459          * If we are in the middle of error recovery, don't let anyone
1460          * else try and use this device.  Also, if error recovery fails, it
1461          * may try and take the device offline, in which case all further
1462          * access to the device is prohibited.
1463          */
1464         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1465                         (mode & FMODE_NDELAY) != 0);
1466         if (error)
1467                 goto out;
1468
1469         if (is_sed_ioctl(cmd))
1470                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1471
1472         /*
1473          * Send SCSI addressing ioctls directly to mid level, send other
1474          * ioctls to block level and then onto mid level if they can't be
1475          * resolved.
1476          */
1477         switch (cmd) {
1478                 case SCSI_IOCTL_GET_IDLUN:
1479                 case SCSI_IOCTL_GET_BUS_NUMBER:
1480                         error = scsi_ioctl(sdp, cmd, p);
1481                         break;
1482                 default:
1483                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1484                         if (error != -ENOTTY)
1485                                 break;
1486                         error = scsi_ioctl(sdp, cmd, p);
1487                         break;
1488         }
1489 out:
1490         return error;
1491 }
1492
1493 static void set_media_not_present(struct scsi_disk *sdkp)
1494 {
1495         if (sdkp->media_present)
1496                 sdkp->device->changed = 1;
1497
1498         if (sdkp->device->removable) {
1499                 sdkp->media_present = 0;
1500                 sdkp->capacity = 0;
1501         }
1502 }
1503
1504 static int media_not_present(struct scsi_disk *sdkp,
1505                              struct scsi_sense_hdr *sshdr)
1506 {
1507         if (!scsi_sense_valid(sshdr))
1508                 return 0;
1509
1510         /* not invoked for commands that could return deferred errors */
1511         switch (sshdr->sense_key) {
1512         case UNIT_ATTENTION:
1513         case NOT_READY:
1514                 /* medium not present */
1515                 if (sshdr->asc == 0x3A) {
1516                         set_media_not_present(sdkp);
1517                         return 1;
1518                 }
1519         }
1520         return 0;
1521 }
1522
1523 /**
1524  *      sd_check_events - check media events
1525  *      @disk: kernel device descriptor
1526  *      @clearing: disk events currently being cleared
1527  *
1528  *      Returns mask of DISK_EVENT_*.
1529  *
1530  *      Note: this function is invoked from the block subsystem.
1531  **/
1532 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1533 {
1534         struct scsi_disk *sdkp = scsi_disk_get(disk);
1535         struct scsi_device *sdp;
1536         int retval;
1537
1538         if (!sdkp)
1539                 return 0;
1540
1541         sdp = sdkp->device;
1542         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1543
1544         /*
1545          * If the device is offline, don't send any commands - just pretend as
1546          * if the command failed.  If the device ever comes back online, we
1547          * can deal with it then.  It is only because of unrecoverable errors
1548          * that we would ever take a device offline in the first place.
1549          */
1550         if (!scsi_device_online(sdp)) {
1551                 set_media_not_present(sdkp);
1552                 goto out;
1553         }
1554
1555         /*
1556          * Using TEST_UNIT_READY enables differentiation between drive with
1557          * no cartridge loaded - NOT READY, drive with changed cartridge -
1558          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1559          *
1560          * Drives that auto spin down. eg iomega jaz 1G, will be started
1561          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1562          * sd_revalidate() is called.
1563          */
1564         if (scsi_block_when_processing_errors(sdp)) {
1565                 struct scsi_sense_hdr sshdr = { 0, };
1566
1567                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1568                                               &sshdr);
1569
1570                 /* failed to execute TUR, assume media not present */
1571                 if (host_byte(retval)) {
1572                         set_media_not_present(sdkp);
1573                         goto out;
1574                 }
1575
1576                 if (media_not_present(sdkp, &sshdr))
1577                         goto out;
1578         }
1579
1580         /*
1581          * For removable scsi disk we have to recognise the presence
1582          * of a disk in the drive.
1583          */
1584         if (!sdkp->media_present)
1585                 sdp->changed = 1;
1586         sdkp->media_present = 1;
1587 out:
1588         /*
1589          * sdp->changed is set under the following conditions:
1590          *
1591          *      Medium present state has changed in either direction.
1592          *      Device has indicated UNIT_ATTENTION.
1593          */
1594         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1595         sdp->changed = 0;
1596         scsi_disk_put(sdkp);
1597         return retval;
1598 }
1599
1600 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1601 {
1602         int retries, res;
1603         struct scsi_device *sdp = sdkp->device;
1604         const int timeout = sdp->request_queue->rq_timeout
1605                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1606         struct scsi_sense_hdr my_sshdr;
1607
1608         if (!scsi_device_online(sdp))
1609                 return -ENODEV;
1610
1611         /* caller might not be interested in sense, but we need it */
1612         if (!sshdr)
1613                 sshdr = &my_sshdr;
1614
1615         for (retries = 3; retries > 0; --retries) {
1616                 unsigned char cmd[10] = { 0 };
1617
1618                 cmd[0] = SYNCHRONIZE_CACHE;
1619                 /*
1620                  * Leave the rest of the command zero to indicate
1621                  * flush everything.
1622                  */
1623                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1624                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1625                 if (res == 0)
1626                         break;
1627         }
1628
1629         if (res) {
1630                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1631
1632                 if (driver_byte(res) == DRIVER_SENSE)
1633                         sd_print_sense_hdr(sdkp, sshdr);
1634
1635                 /* we need to evaluate the error return  */
1636                 if (scsi_sense_valid(sshdr) &&
1637                         (sshdr->asc == 0x3a ||  /* medium not present */
1638                          sshdr->asc == 0x20))   /* invalid command */
1639                                 /* this is no error here */
1640                                 return 0;
1641
1642                 switch (host_byte(res)) {
1643                 /* ignore errors due to racing a disconnection */
1644                 case DID_BAD_TARGET:
1645                 case DID_NO_CONNECT:
1646                         return 0;
1647                 /* signal the upper layer it might try again */
1648                 case DID_BUS_BUSY:
1649                 case DID_IMM_RETRY:
1650                 case DID_REQUEUE:
1651                 case DID_SOFT_ERROR:
1652                         return -EBUSY;
1653                 default:
1654                         return -EIO;
1655                 }
1656         }
1657         return 0;
1658 }
1659
1660 static void sd_rescan(struct device *dev)
1661 {
1662         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1663
1664         revalidate_disk(sdkp->disk);
1665 }
1666
1667
1668 #ifdef CONFIG_COMPAT
1669 /* 
1670  * This gets directly called from VFS. When the ioctl 
1671  * is not recognized we go back to the other translation paths. 
1672  */
1673 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1674                            unsigned int cmd, unsigned long arg)
1675 {
1676         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1677         int error;
1678
1679         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1680                         (mode & FMODE_NDELAY) != 0);
1681         if (error)
1682                 return error;
1683                
1684         /* 
1685          * Let the static ioctl translation table take care of it.
1686          */
1687         if (!sdev->host->hostt->compat_ioctl)
1688                 return -ENOIOCTLCMD; 
1689         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1690 }
1691 #endif
1692
1693 static char sd_pr_type(enum pr_type type)
1694 {
1695         switch (type) {
1696         case PR_WRITE_EXCLUSIVE:
1697                 return 0x01;
1698         case PR_EXCLUSIVE_ACCESS:
1699                 return 0x03;
1700         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1701                 return 0x05;
1702         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1703                 return 0x06;
1704         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1705                 return 0x07;
1706         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1707                 return 0x08;
1708         default:
1709                 return 0;
1710         }
1711 };
1712
1713 static int sd_pr_command(struct block_device *bdev, u8 sa,
1714                 u64 key, u64 sa_key, u8 type, u8 flags)
1715 {
1716         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1717         struct scsi_sense_hdr sshdr;
1718         int result;
1719         u8 cmd[16] = { 0, };
1720         u8 data[24] = { 0, };
1721
1722         cmd[0] = PERSISTENT_RESERVE_OUT;
1723         cmd[1] = sa;
1724         cmd[2] = type;
1725         put_unaligned_be32(sizeof(data), &cmd[5]);
1726
1727         put_unaligned_be64(key, &data[0]);
1728         put_unaligned_be64(sa_key, &data[8]);
1729         data[20] = flags;
1730
1731         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1732                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1733
1734         if (driver_byte(result) == DRIVER_SENSE &&
1735             scsi_sense_valid(&sshdr)) {
1736                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1737                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1738         }
1739
1740         return result;
1741 }
1742
1743 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1744                 u32 flags)
1745 {
1746         if (flags & ~PR_FL_IGNORE_KEY)
1747                 return -EOPNOTSUPP;
1748         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1749                         old_key, new_key, 0,
1750                         (1 << 0) /* APTPL */);
1751 }
1752
1753 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1754                 u32 flags)
1755 {
1756         if (flags)
1757                 return -EOPNOTSUPP;
1758         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1759 }
1760
1761 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1762 {
1763         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1764 }
1765
1766 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1767                 enum pr_type type, bool abort)
1768 {
1769         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1770                              sd_pr_type(type), 0);
1771 }
1772
1773 static int sd_pr_clear(struct block_device *bdev, u64 key)
1774 {
1775         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1776 }
1777
1778 static const struct pr_ops sd_pr_ops = {
1779         .pr_register    = sd_pr_register,
1780         .pr_reserve     = sd_pr_reserve,
1781         .pr_release     = sd_pr_release,
1782         .pr_preempt     = sd_pr_preempt,
1783         .pr_clear       = sd_pr_clear,
1784 };
1785
1786 static const struct block_device_operations sd_fops = {
1787         .owner                  = THIS_MODULE,
1788         .open                   = sd_open,
1789         .release                = sd_release,
1790         .ioctl                  = sd_ioctl,
1791         .getgeo                 = sd_getgeo,
1792 #ifdef CONFIG_COMPAT
1793         .compat_ioctl           = sd_compat_ioctl,
1794 #endif
1795         .check_events           = sd_check_events,
1796         .revalidate_disk        = sd_revalidate_disk,
1797         .unlock_native_capacity = sd_unlock_native_capacity,
1798         .report_zones           = sd_zbc_report_zones,
1799         .pr_ops                 = &sd_pr_ops,
1800 };
1801
1802 /**
1803  *      sd_eh_reset - reset error handling callback
1804  *      @scmd:          sd-issued command that has failed
1805  *
1806  *      This function is called by the SCSI midlayer before starting
1807  *      SCSI EH. When counting medium access failures we have to be
1808  *      careful to register it only only once per device and SCSI EH run;
1809  *      there might be several timed out commands which will cause the
1810  *      'max_medium_access_timeouts' counter to trigger after the first
1811  *      SCSI EH run already and set the device to offline.
1812  *      So this function resets the internal counter before starting SCSI EH.
1813  **/
1814 static void sd_eh_reset(struct scsi_cmnd *scmd)
1815 {
1816         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1817
1818         /* New SCSI EH run, reset gate variable */
1819         sdkp->ignore_medium_access_errors = false;
1820 }
1821
1822 /**
1823  *      sd_eh_action - error handling callback
1824  *      @scmd:          sd-issued command that has failed
1825  *      @eh_disp:       The recovery disposition suggested by the midlayer
1826  *
1827  *      This function is called by the SCSI midlayer upon completion of an
1828  *      error test command (currently TEST UNIT READY). The result of sending
1829  *      the eh command is passed in eh_disp.  We're looking for devices that
1830  *      fail medium access commands but are OK with non access commands like
1831  *      test unit ready (so wrongly see the device as having a successful
1832  *      recovery)
1833  **/
1834 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1835 {
1836         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1837         struct scsi_device *sdev = scmd->device;
1838
1839         if (!scsi_device_online(sdev) ||
1840             !scsi_medium_access_command(scmd) ||
1841             host_byte(scmd->result) != DID_TIME_OUT ||
1842             eh_disp != SUCCESS)
1843                 return eh_disp;
1844
1845         /*
1846          * The device has timed out executing a medium access command.
1847          * However, the TEST UNIT READY command sent during error
1848          * handling completed successfully. Either the device is in the
1849          * process of recovering or has it suffered an internal failure
1850          * that prevents access to the storage medium.
1851          */
1852         if (!sdkp->ignore_medium_access_errors) {
1853                 sdkp->medium_access_timed_out++;
1854                 sdkp->ignore_medium_access_errors = true;
1855         }
1856
1857         /*
1858          * If the device keeps failing read/write commands but TEST UNIT
1859          * READY always completes successfully we assume that medium
1860          * access is no longer possible and take the device offline.
1861          */
1862         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1863                 scmd_printk(KERN_ERR, scmd,
1864                             "Medium access timeout failure. Offlining disk!\n");
1865                 mutex_lock(&sdev->state_mutex);
1866                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1867                 mutex_unlock(&sdev->state_mutex);
1868
1869                 return SUCCESS;
1870         }
1871
1872         return eh_disp;
1873 }
1874
1875 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1876 {
1877         struct request *req = scmd->request;
1878         struct scsi_device *sdev = scmd->device;
1879         unsigned int transferred, good_bytes;
1880         u64 start_lba, end_lba, bad_lba;
1881
1882         /*
1883          * Some commands have a payload smaller than the device logical
1884          * block size (e.g. INQUIRY on a 4K disk).
1885          */
1886         if (scsi_bufflen(scmd) <= sdev->sector_size)
1887                 return 0;
1888
1889         /* Check if we have a 'bad_lba' information */
1890         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1891                                      SCSI_SENSE_BUFFERSIZE,
1892                                      &bad_lba))
1893                 return 0;
1894
1895         /*
1896          * If the bad lba was reported incorrectly, we have no idea where
1897          * the error is.
1898          */
1899         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1900         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1901         if (bad_lba < start_lba || bad_lba >= end_lba)
1902                 return 0;
1903
1904         /*
1905          * resid is optional but mostly filled in.  When it's unused,
1906          * its value is zero, so we assume the whole buffer transferred
1907          */
1908         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1909
1910         /* This computation should always be done in terms of the
1911          * resolution of the device's medium.
1912          */
1913         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1914
1915         return min(good_bytes, transferred);
1916 }
1917
1918 /**
1919  *      sd_done - bottom half handler: called when the lower level
1920  *      driver has completed (successfully or otherwise) a scsi command.
1921  *      @SCpnt: mid-level's per command structure.
1922  *
1923  *      Note: potentially run from within an ISR. Must not block.
1924  **/
1925 static int sd_done(struct scsi_cmnd *SCpnt)
1926 {
1927         int result = SCpnt->result;
1928         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1929         unsigned int sector_size = SCpnt->device->sector_size;
1930         unsigned int resid;
1931         struct scsi_sense_hdr sshdr;
1932         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1933         struct request *req = SCpnt->request;
1934         int sense_valid = 0;
1935         int sense_deferred = 0;
1936
1937         switch (req_op(req)) {
1938         case REQ_OP_DISCARD:
1939         case REQ_OP_WRITE_ZEROES:
1940         case REQ_OP_WRITE_SAME:
1941         case REQ_OP_ZONE_RESET:
1942                 if (!result) {
1943                         good_bytes = blk_rq_bytes(req);
1944                         scsi_set_resid(SCpnt, 0);
1945                 } else {
1946                         good_bytes = 0;
1947                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1948                 }
1949                 break;
1950         default:
1951                 /*
1952                  * In case of bogus fw or device, we could end up having
1953                  * an unaligned partial completion. Check this here and force
1954                  * alignment.
1955                  */
1956                 resid = scsi_get_resid(SCpnt);
1957                 if (resid & (sector_size - 1)) {
1958                         sd_printk(KERN_INFO, sdkp,
1959                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1960                                 resid, sector_size);
1961                         resid = min(scsi_bufflen(SCpnt),
1962                                     round_up(resid, sector_size));
1963                         scsi_set_resid(SCpnt, resid);
1964                 }
1965         }
1966
1967         if (result) {
1968                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1969                 if (sense_valid)
1970                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1971         }
1972         sdkp->medium_access_timed_out = 0;
1973
1974         if (driver_byte(result) != DRIVER_SENSE &&
1975             (!sense_valid || sense_deferred))
1976                 goto out;
1977
1978         switch (sshdr.sense_key) {
1979         case HARDWARE_ERROR:
1980         case MEDIUM_ERROR:
1981                 good_bytes = sd_completed_bytes(SCpnt);
1982                 break;
1983         case RECOVERED_ERROR:
1984                 good_bytes = scsi_bufflen(SCpnt);
1985                 break;
1986         case NO_SENSE:
1987                 /* This indicates a false check condition, so ignore it.  An
1988                  * unknown amount of data was transferred so treat it as an
1989                  * error.
1990                  */
1991                 SCpnt->result = 0;
1992                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1993                 break;
1994         case ABORTED_COMMAND:
1995                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1996                         good_bytes = sd_completed_bytes(SCpnt);
1997                 break;
1998         case ILLEGAL_REQUEST:
1999                 switch (sshdr.asc) {
2000                 case 0x10:      /* DIX: Host detected corruption */
2001                         good_bytes = sd_completed_bytes(SCpnt);
2002                         break;
2003                 case 0x20:      /* INVALID COMMAND OPCODE */
2004                 case 0x24:      /* INVALID FIELD IN CDB */
2005                         switch (SCpnt->cmnd[0]) {
2006                         case UNMAP:
2007                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2008                                 break;
2009                         case WRITE_SAME_16:
2010                         case WRITE_SAME:
2011                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2012                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2013                                 } else {
2014                                         sdkp->device->no_write_same = 1;
2015                                         sd_config_write_same(sdkp);
2016                                         req->rq_flags |= RQF_QUIET;
2017                                 }
2018                                 break;
2019                         }
2020                 }
2021                 break;
2022         default:
2023                 break;
2024         }
2025
2026  out:
2027         if (sd_is_zoned(sdkp))
2028                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2029
2030         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2031                                            "sd_done: completed %d of %d bytes\n",
2032                                            good_bytes, scsi_bufflen(SCpnt)));
2033
2034         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2035             good_bytes)
2036                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2037                                 good_bytes / scsi_prot_interval(SCpnt));
2038
2039         return good_bytes;
2040 }
2041
2042 /*
2043  * spinup disk - called only in sd_revalidate_disk()
2044  */
2045 static void
2046 sd_spinup_disk(struct scsi_disk *sdkp)
2047 {
2048         unsigned char cmd[10];
2049         unsigned long spintime_expire = 0;
2050         int retries, spintime;
2051         unsigned int the_result;
2052         struct scsi_sense_hdr sshdr;
2053         int sense_valid = 0;
2054
2055         spintime = 0;
2056
2057         /* Spin up drives, as required.  Only do this at boot time */
2058         /* Spinup needs to be done for module loads too. */
2059         do {
2060                 retries = 0;
2061
2062                 do {
2063                         cmd[0] = TEST_UNIT_READY;
2064                         memset((void *) &cmd[1], 0, 9);
2065
2066                         the_result = scsi_execute_req(sdkp->device, cmd,
2067                                                       DMA_NONE, NULL, 0,
2068                                                       &sshdr, SD_TIMEOUT,
2069                                                       SD_MAX_RETRIES, NULL);
2070
2071                         /*
2072                          * If the drive has indicated to us that it
2073                          * doesn't have any media in it, don't bother
2074                          * with any more polling.
2075                          */
2076                         if (media_not_present(sdkp, &sshdr))
2077                                 return;
2078
2079                         if (the_result)
2080                                 sense_valid = scsi_sense_valid(&sshdr);
2081                         retries++;
2082                 } while (retries < 3 && 
2083                          (!scsi_status_is_good(the_result) ||
2084                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2085                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2086
2087                 if (driver_byte(the_result) != DRIVER_SENSE) {
2088                         /* no sense, TUR either succeeded or failed
2089                          * with a status error */
2090                         if(!spintime && !scsi_status_is_good(the_result)) {
2091                                 sd_print_result(sdkp, "Test Unit Ready failed",
2092                                                 the_result);
2093                         }
2094                         break;
2095                 }
2096
2097                 /*
2098                  * The device does not want the automatic start to be issued.
2099                  */
2100                 if (sdkp->device->no_start_on_add)
2101                         break;
2102
2103                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2104                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2105                                 break;  /* manual intervention required */
2106                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2107                                 break;  /* standby */
2108                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2109                                 break;  /* unavailable */
2110                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2111                                 break;  /* sanitize in progress */
2112                         /*
2113                          * Issue command to spin up drive when not ready
2114                          */
2115                         if (!spintime) {
2116                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2117                                 cmd[0] = START_STOP;
2118                                 cmd[1] = 1;     /* Return immediately */
2119                                 memset((void *) &cmd[2], 0, 8);
2120                                 cmd[4] = 1;     /* Start spin cycle */
2121                                 if (sdkp->device->start_stop_pwr_cond)
2122                                         cmd[4] |= 1 << 4;
2123                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2124                                                  NULL, 0, &sshdr,
2125                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2126                                                  NULL);
2127                                 spintime_expire = jiffies + 100 * HZ;
2128                                 spintime = 1;
2129                         }
2130                         /* Wait 1 second for next try */
2131                         msleep(1000);
2132                         printk(KERN_CONT ".");
2133
2134                 /*
2135                  * Wait for USB flash devices with slow firmware.
2136                  * Yes, this sense key/ASC combination shouldn't
2137                  * occur here.  It's characteristic of these devices.
2138                  */
2139                 } else if (sense_valid &&
2140                                 sshdr.sense_key == UNIT_ATTENTION &&
2141                                 sshdr.asc == 0x28) {
2142                         if (!spintime) {
2143                                 spintime_expire = jiffies + 5 * HZ;
2144                                 spintime = 1;
2145                         }
2146                         /* Wait 1 second for next try */
2147                         msleep(1000);
2148                 } else {
2149                         /* we don't understand the sense code, so it's
2150                          * probably pointless to loop */
2151                         if(!spintime) {
2152                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2153                                 sd_print_sense_hdr(sdkp, &sshdr);
2154                         }
2155                         break;
2156                 }
2157                                 
2158         } while (spintime && time_before_eq(jiffies, spintime_expire));
2159
2160         if (spintime) {
2161                 if (scsi_status_is_good(the_result))
2162                         printk(KERN_CONT "ready\n");
2163                 else
2164                         printk(KERN_CONT "not responding...\n");
2165         }
2166 }
2167
2168 /*
2169  * Determine whether disk supports Data Integrity Field.
2170  */
2171 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2172 {
2173         struct scsi_device *sdp = sdkp->device;
2174         u8 type;
2175         int ret = 0;
2176
2177         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2178                 return ret;
2179
2180         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2181
2182         if (type > T10_PI_TYPE3_PROTECTION)
2183                 ret = -ENODEV;
2184         else if (scsi_host_dif_capable(sdp->host, type))
2185                 ret = 1;
2186
2187         if (sdkp->first_scan || type != sdkp->protection_type)
2188                 switch (ret) {
2189                 case -ENODEV:
2190                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2191                                   " protection type %u. Disabling disk!\n",
2192                                   type);
2193                         break;
2194                 case 1:
2195                         sd_printk(KERN_NOTICE, sdkp,
2196                                   "Enabling DIF Type %u protection\n", type);
2197                         break;
2198                 case 0:
2199                         sd_printk(KERN_NOTICE, sdkp,
2200                                   "Disabling DIF Type %u protection\n", type);
2201                         break;
2202                 }
2203
2204         sdkp->protection_type = type;
2205
2206         return ret;
2207 }
2208
2209 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2210                         struct scsi_sense_hdr *sshdr, int sense_valid,
2211                         int the_result)
2212 {
2213         if (driver_byte(the_result) == DRIVER_SENSE)
2214                 sd_print_sense_hdr(sdkp, sshdr);
2215         else
2216                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2217
2218         /*
2219          * Set dirty bit for removable devices if not ready -
2220          * sometimes drives will not report this properly.
2221          */
2222         if (sdp->removable &&
2223             sense_valid && sshdr->sense_key == NOT_READY)
2224                 set_media_not_present(sdkp);
2225
2226         /*
2227          * We used to set media_present to 0 here to indicate no media
2228          * in the drive, but some drives fail read capacity even with
2229          * media present, so we can't do that.
2230          */
2231         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2232 }
2233
2234 #define RC16_LEN 32
2235 #if RC16_LEN > SD_BUF_SIZE
2236 #error RC16_LEN must not be more than SD_BUF_SIZE
2237 #endif
2238
2239 #define READ_CAPACITY_RETRIES_ON_RESET  10
2240
2241 /*
2242  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2243  * and the reported logical block size is bigger than 512 bytes. Note
2244  * that last_sector is a u64 and therefore logical_to_sectors() is not
2245  * applicable.
2246  */
2247 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2248 {
2249         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2250
2251         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2252                 return false;
2253
2254         return true;
2255 }
2256
2257 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2258                                                 unsigned char *buffer)
2259 {
2260         unsigned char cmd[16];
2261         struct scsi_sense_hdr sshdr;
2262         int sense_valid = 0;
2263         int the_result;
2264         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2265         unsigned int alignment;
2266         unsigned long long lba;
2267         unsigned sector_size;
2268
2269         if (sdp->no_read_capacity_16)
2270                 return -EINVAL;
2271
2272         do {
2273                 memset(cmd, 0, 16);
2274                 cmd[0] = SERVICE_ACTION_IN_16;
2275                 cmd[1] = SAI_READ_CAPACITY_16;
2276                 cmd[13] = RC16_LEN;
2277                 memset(buffer, 0, RC16_LEN);
2278
2279                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2280                                         buffer, RC16_LEN, &sshdr,
2281                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2282
2283                 if (media_not_present(sdkp, &sshdr))
2284                         return -ENODEV;
2285
2286                 if (the_result) {
2287                         sense_valid = scsi_sense_valid(&sshdr);
2288                         if (sense_valid &&
2289                             sshdr.sense_key == ILLEGAL_REQUEST &&
2290                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2291                             sshdr.ascq == 0x00)
2292                                 /* Invalid Command Operation Code or
2293                                  * Invalid Field in CDB, just retry
2294                                  * silently with RC10 */
2295                                 return -EINVAL;
2296                         if (sense_valid &&
2297                             sshdr.sense_key == UNIT_ATTENTION &&
2298                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2299                                 /* Device reset might occur several times,
2300                                  * give it one more chance */
2301                                 if (--reset_retries > 0)
2302                                         continue;
2303                 }
2304                 retries--;
2305
2306         } while (the_result && retries);
2307
2308         if (the_result) {
2309                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2310                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2311                 return -EINVAL;
2312         }
2313
2314         sector_size = get_unaligned_be32(&buffer[8]);
2315         lba = get_unaligned_be64(&buffer[0]);
2316
2317         if (sd_read_protection_type(sdkp, buffer) < 0) {
2318                 sdkp->capacity = 0;
2319                 return -ENODEV;
2320         }
2321
2322         if (!sd_addressable_capacity(lba, sector_size)) {
2323                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2324                         "kernel compiled with support for large block "
2325                         "devices.\n");
2326                 sdkp->capacity = 0;
2327                 return -EOVERFLOW;
2328         }
2329
2330         /* Logical blocks per physical block exponent */
2331         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2332
2333         /* RC basis */
2334         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2335
2336         /* Lowest aligned logical block */
2337         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2338         blk_queue_alignment_offset(sdp->request_queue, alignment);
2339         if (alignment && sdkp->first_scan)
2340                 sd_printk(KERN_NOTICE, sdkp,
2341                           "physical block alignment offset: %u\n", alignment);
2342
2343         if (buffer[14] & 0x80) { /* LBPME */
2344                 sdkp->lbpme = 1;
2345
2346                 if (buffer[14] & 0x40) /* LBPRZ */
2347                         sdkp->lbprz = 1;
2348
2349                 sd_config_discard(sdkp, SD_LBP_WS16);
2350         }
2351
2352         sdkp->capacity = lba + 1;
2353         return sector_size;
2354 }
2355
2356 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2357                                                 unsigned char *buffer)
2358 {
2359         unsigned char cmd[16];
2360         struct scsi_sense_hdr sshdr;
2361         int sense_valid = 0;
2362         int the_result;
2363         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2364         sector_t lba;
2365         unsigned sector_size;
2366
2367         do {
2368                 cmd[0] = READ_CAPACITY;
2369                 memset(&cmd[1], 0, 9);
2370                 memset(buffer, 0, 8);
2371
2372                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2373                                         buffer, 8, &sshdr,
2374                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2375
2376                 if (media_not_present(sdkp, &sshdr))
2377                         return -ENODEV;
2378
2379                 if (the_result) {
2380                         sense_valid = scsi_sense_valid(&sshdr);
2381                         if (sense_valid &&
2382                             sshdr.sense_key == UNIT_ATTENTION &&
2383                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2384                                 /* Device reset might occur several times,
2385                                  * give it one more chance */
2386                                 if (--reset_retries > 0)
2387                                         continue;
2388                 }
2389                 retries--;
2390
2391         } while (the_result && retries);
2392
2393         if (the_result) {
2394                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2395                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2396                 return -EINVAL;
2397         }
2398
2399         sector_size = get_unaligned_be32(&buffer[4]);
2400         lba = get_unaligned_be32(&buffer[0]);
2401
2402         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2403                 /* Some buggy (usb cardreader) devices return an lba of
2404                    0xffffffff when the want to report a size of 0 (with
2405                    which they really mean no media is present) */
2406                 sdkp->capacity = 0;
2407                 sdkp->physical_block_size = sector_size;
2408                 return sector_size;
2409         }
2410
2411         if (!sd_addressable_capacity(lba, sector_size)) {
2412                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2413                         "kernel compiled with support for large block "
2414                         "devices.\n");
2415                 sdkp->capacity = 0;
2416                 return -EOVERFLOW;
2417         }
2418
2419         sdkp->capacity = lba + 1;
2420         sdkp->physical_block_size = sector_size;
2421         return sector_size;
2422 }
2423
2424 static int sd_try_rc16_first(struct scsi_device *sdp)
2425 {
2426         if (sdp->host->max_cmd_len < 16)
2427                 return 0;
2428         if (sdp->try_rc_10_first)
2429                 return 0;
2430         if (sdp->scsi_level > SCSI_SPC_2)
2431                 return 1;
2432         if (scsi_device_protection(sdp))
2433                 return 1;
2434         return 0;
2435 }
2436
2437 /*
2438  * read disk capacity
2439  */
2440 static void
2441 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2442 {
2443         int sector_size;
2444         struct scsi_device *sdp = sdkp->device;
2445
2446         if (sd_try_rc16_first(sdp)) {
2447                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2448                 if (sector_size == -EOVERFLOW)
2449                         goto got_data;
2450                 if (sector_size == -ENODEV)
2451                         return;
2452                 if (sector_size < 0)
2453                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2454                 if (sector_size < 0)
2455                         return;
2456         } else {
2457                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2458                 if (sector_size == -EOVERFLOW)
2459                         goto got_data;
2460                 if (sector_size < 0)
2461                         return;
2462                 if ((sizeof(sdkp->capacity) > 4) &&
2463                     (sdkp->capacity > 0xffffffffULL)) {
2464                         int old_sector_size = sector_size;
2465                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2466                                         "Trying to use READ CAPACITY(16).\n");
2467                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2468                         if (sector_size < 0) {
2469                                 sd_printk(KERN_NOTICE, sdkp,
2470                                         "Using 0xffffffff as device size\n");
2471                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2472                                 sector_size = old_sector_size;
2473                                 goto got_data;
2474                         }
2475                         /* Remember that READ CAPACITY(16) succeeded */
2476                         sdp->try_rc_10_first = 0;
2477                 }
2478         }
2479
2480         /* Some devices are known to return the total number of blocks,
2481          * not the highest block number.  Some devices have versions
2482          * which do this and others which do not.  Some devices we might
2483          * suspect of doing this but we don't know for certain.
2484          *
2485          * If we know the reported capacity is wrong, decrement it.  If
2486          * we can only guess, then assume the number of blocks is even
2487          * (usually true but not always) and err on the side of lowering
2488          * the capacity.
2489          */
2490         if (sdp->fix_capacity ||
2491             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2492                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2493                                 "from its reported value: %llu\n",
2494                                 (unsigned long long) sdkp->capacity);
2495                 --sdkp->capacity;
2496         }
2497
2498 got_data:
2499         if (sector_size == 0) {
2500                 sector_size = 512;
2501                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2502                           "assuming 512.\n");
2503         }
2504
2505         if (sector_size != 512 &&
2506             sector_size != 1024 &&
2507             sector_size != 2048 &&
2508             sector_size != 4096) {
2509                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2510                           sector_size);
2511                 /*
2512                  * The user might want to re-format the drive with
2513                  * a supported sectorsize.  Once this happens, it
2514                  * would be relatively trivial to set the thing up.
2515                  * For this reason, we leave the thing in the table.
2516                  */
2517                 sdkp->capacity = 0;
2518                 /*
2519                  * set a bogus sector size so the normal read/write
2520                  * logic in the block layer will eventually refuse any
2521                  * request on this device without tripping over power
2522                  * of two sector size assumptions
2523                  */
2524                 sector_size = 512;
2525         }
2526         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2527         blk_queue_physical_block_size(sdp->request_queue,
2528                                       sdkp->physical_block_size);
2529         sdkp->device->sector_size = sector_size;
2530
2531         if (sdkp->capacity > 0xffffffff)
2532                 sdp->use_16_for_rw = 1;
2533
2534 }
2535
2536 /*
2537  * Print disk capacity
2538  */
2539 static void
2540 sd_print_capacity(struct scsi_disk *sdkp,
2541                   sector_t old_capacity)
2542 {
2543         int sector_size = sdkp->device->sector_size;
2544         char cap_str_2[10], cap_str_10[10];
2545
2546         string_get_size(sdkp->capacity, sector_size,
2547                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2548         string_get_size(sdkp->capacity, sector_size,
2549                         STRING_UNITS_10, cap_str_10,
2550                         sizeof(cap_str_10));
2551
2552         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2553                 sd_printk(KERN_NOTICE, sdkp,
2554                           "%llu %d-byte logical blocks: (%s/%s)\n",
2555                           (unsigned long long)sdkp->capacity,
2556                           sector_size, cap_str_10, cap_str_2);
2557
2558                 if (sdkp->physical_block_size != sector_size)
2559                         sd_printk(KERN_NOTICE, sdkp,
2560                                   "%u-byte physical blocks\n",
2561                                   sdkp->physical_block_size);
2562
2563                 sd_zbc_print_zones(sdkp);
2564         }
2565 }
2566
2567 /* called with buffer of length 512 */
2568 static inline int
2569 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2570                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2571                  struct scsi_sense_hdr *sshdr)
2572 {
2573         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2574                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2575                                sshdr);
2576 }
2577
2578 /*
2579  * read write protect setting, if possible - called only in sd_revalidate_disk()
2580  * called with buffer of length SD_BUF_SIZE
2581  */
2582 static void
2583 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2584 {
2585         int res;
2586         struct scsi_device *sdp = sdkp->device;
2587         struct scsi_mode_data data;
2588         int disk_ro = get_disk_ro(sdkp->disk);
2589         int old_wp = sdkp->write_prot;
2590
2591         set_disk_ro(sdkp->disk, 0);
2592         if (sdp->skip_ms_page_3f) {
2593                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2594                 return;
2595         }
2596
2597         if (sdp->use_192_bytes_for_3f) {
2598                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2599         } else {
2600                 /*
2601                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2602                  * We have to start carefully: some devices hang if we ask
2603                  * for more than is available.
2604                  */
2605                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2606
2607                 /*
2608                  * Second attempt: ask for page 0 When only page 0 is
2609                  * implemented, a request for page 3F may return Sense Key
2610                  * 5: Illegal Request, Sense Code 24: Invalid field in
2611                  * CDB.
2612                  */
2613                 if (!scsi_status_is_good(res))
2614                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2615
2616                 /*
2617                  * Third attempt: ask 255 bytes, as we did earlier.
2618                  */
2619                 if (!scsi_status_is_good(res))
2620                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2621                                                &data, NULL);
2622         }
2623
2624         if (!scsi_status_is_good(res)) {
2625                 sd_first_printk(KERN_WARNING, sdkp,
2626                           "Test WP failed, assume Write Enabled\n");
2627         } else {
2628                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2629                 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2630                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2631                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2632                                   sdkp->write_prot ? "on" : "off");
2633                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2634                 }
2635         }
2636 }
2637
2638 /*
2639  * sd_read_cache_type - called only from sd_revalidate_disk()
2640  * called with buffer of length SD_BUF_SIZE
2641  */
2642 static void
2643 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2644 {
2645         int len = 0, res;
2646         struct scsi_device *sdp = sdkp->device;
2647
2648         int dbd;
2649         int modepage;
2650         int first_len;
2651         struct scsi_mode_data data;
2652         struct scsi_sense_hdr sshdr;
2653         int old_wce = sdkp->WCE;
2654         int old_rcd = sdkp->RCD;
2655         int old_dpofua = sdkp->DPOFUA;
2656
2657
2658         if (sdkp->cache_override)
2659                 return;
2660
2661         first_len = 4;
2662         if (sdp->skip_ms_page_8) {
2663                 if (sdp->type == TYPE_RBC)
2664                         goto defaults;
2665                 else {
2666                         if (sdp->skip_ms_page_3f)
2667                                 goto defaults;
2668                         modepage = 0x3F;
2669                         if (sdp->use_192_bytes_for_3f)
2670                                 first_len = 192;
2671                         dbd = 0;
2672                 }
2673         } else if (sdp->type == TYPE_RBC) {
2674                 modepage = 6;
2675                 dbd = 8;
2676         } else {
2677                 modepage = 8;
2678                 dbd = 0;
2679         }
2680
2681         /* cautiously ask */
2682         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2683                         &data, &sshdr);
2684
2685         if (!scsi_status_is_good(res))
2686                 goto bad_sense;
2687
2688         if (!data.header_length) {
2689                 modepage = 6;
2690                 first_len = 0;
2691                 sd_first_printk(KERN_ERR, sdkp,
2692                                 "Missing header in MODE_SENSE response\n");
2693         }
2694
2695         /* that went OK, now ask for the proper length */
2696         len = data.length;
2697
2698         /*
2699          * We're only interested in the first three bytes, actually.
2700          * But the data cache page is defined for the first 20.
2701          */
2702         if (len < 3)
2703                 goto bad_sense;
2704         else if (len > SD_BUF_SIZE) {
2705                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2706                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2707                 len = SD_BUF_SIZE;
2708         }
2709         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2710                 len = 192;
2711
2712         /* Get the data */
2713         if (len > first_len)
2714                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2715                                 &data, &sshdr);
2716
2717         if (scsi_status_is_good(res)) {
2718                 int offset = data.header_length + data.block_descriptor_length;
2719
2720                 while (offset < len) {
2721                         u8 page_code = buffer[offset] & 0x3F;
2722                         u8 spf       = buffer[offset] & 0x40;
2723
2724                         if (page_code == 8 || page_code == 6) {
2725                                 /* We're interested only in the first 3 bytes.
2726                                  */
2727                                 if (len - offset <= 2) {
2728                                         sd_first_printk(KERN_ERR, sdkp,
2729                                                 "Incomplete mode parameter "
2730                                                         "data\n");
2731                                         goto defaults;
2732                                 } else {
2733                                         modepage = page_code;
2734                                         goto Page_found;
2735                                 }
2736                         } else {
2737                                 /* Go to the next page */
2738                                 if (spf && len - offset > 3)
2739                                         offset += 4 + (buffer[offset+2] << 8) +
2740                                                 buffer[offset+3];
2741                                 else if (!spf && len - offset > 1)
2742                                         offset += 2 + buffer[offset+1];
2743                                 else {
2744                                         sd_first_printk(KERN_ERR, sdkp,
2745                                                         "Incomplete mode "
2746                                                         "parameter data\n");
2747                                         goto defaults;
2748                                 }
2749                         }
2750                 }
2751
2752                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2753                 goto defaults;
2754
2755         Page_found:
2756                 if (modepage == 8) {
2757                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2758                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2759                 } else {
2760                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2761                         sdkp->RCD = 0;
2762                 }
2763
2764                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2765                 if (sdp->broken_fua) {
2766                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2767                         sdkp->DPOFUA = 0;
2768                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2769                            !sdkp->device->use_16_for_rw) {
2770                         sd_first_printk(KERN_NOTICE, sdkp,
2771                                   "Uses READ/WRITE(6), disabling FUA\n");
2772                         sdkp->DPOFUA = 0;
2773                 }
2774
2775                 /* No cache flush allowed for write protected devices */
2776                 if (sdkp->WCE && sdkp->write_prot)
2777                         sdkp->WCE = 0;
2778
2779                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2780                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2781                         sd_printk(KERN_NOTICE, sdkp,
2782                                   "Write cache: %s, read cache: %s, %s\n",
2783                                   sdkp->WCE ? "enabled" : "disabled",
2784                                   sdkp->RCD ? "disabled" : "enabled",
2785                                   sdkp->DPOFUA ? "supports DPO and FUA"
2786                                   : "doesn't support DPO or FUA");
2787
2788                 return;
2789         }
2790
2791 bad_sense:
2792         if (scsi_sense_valid(&sshdr) &&
2793             sshdr.sense_key == ILLEGAL_REQUEST &&
2794             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2795                 /* Invalid field in CDB */
2796                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2797         else
2798                 sd_first_printk(KERN_ERR, sdkp,
2799                                 "Asking for cache data failed\n");
2800
2801 defaults:
2802         if (sdp->wce_default_on) {
2803                 sd_first_printk(KERN_NOTICE, sdkp,
2804                                 "Assuming drive cache: write back\n");
2805                 sdkp->WCE = 1;
2806         } else {
2807                 sd_first_printk(KERN_ERR, sdkp,
2808                                 "Assuming drive cache: write through\n");
2809                 sdkp->WCE = 0;
2810         }
2811         sdkp->RCD = 0;
2812         sdkp->DPOFUA = 0;
2813 }
2814
2815 /*
2816  * The ATO bit indicates whether the DIF application tag is available
2817  * for use by the operating system.
2818  */
2819 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2820 {
2821         int res, offset;
2822         struct scsi_device *sdp = sdkp->device;
2823         struct scsi_mode_data data;
2824         struct scsi_sense_hdr sshdr;
2825
2826         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2827                 return;
2828
2829         if (sdkp->protection_type == 0)
2830                 return;
2831
2832         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2833                               SD_MAX_RETRIES, &data, &sshdr);
2834
2835         if (!scsi_status_is_good(res) || !data.header_length ||
2836             data.length < 6) {
2837                 sd_first_printk(KERN_WARNING, sdkp,
2838                           "getting Control mode page failed, assume no ATO\n");
2839
2840                 if (scsi_sense_valid(&sshdr))
2841                         sd_print_sense_hdr(sdkp, &sshdr);
2842
2843                 return;
2844         }
2845
2846         offset = data.header_length + data.block_descriptor_length;
2847
2848         if ((buffer[offset] & 0x3f) != 0x0a) {
2849                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2850                 return;
2851         }
2852
2853         if ((buffer[offset + 5] & 0x80) == 0)
2854                 return;
2855
2856         sdkp->ATO = 1;
2857
2858         return;
2859 }
2860
2861 /**
2862  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2863  * @sdkp: disk to query
2864  */
2865 static void sd_read_block_limits(struct scsi_disk *sdkp)
2866 {
2867         unsigned int sector_sz = sdkp->device->sector_size;
2868         const int vpd_len = 64;
2869         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2870
2871         if (!buffer ||
2872             /* Block Limits VPD */
2873             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2874                 goto out;
2875
2876         blk_queue_io_min(sdkp->disk->queue,
2877                          get_unaligned_be16(&buffer[6]) * sector_sz);
2878
2879         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2880         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2881
2882         if (buffer[3] == 0x3c) {
2883                 unsigned int lba_count, desc_count;
2884
2885                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2886
2887                 if (!sdkp->lbpme)
2888                         goto out;
2889
2890                 lba_count = get_unaligned_be32(&buffer[20]);
2891                 desc_count = get_unaligned_be32(&buffer[24]);
2892
2893                 if (lba_count && desc_count)
2894                         sdkp->max_unmap_blocks = lba_count;
2895
2896                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2897
2898                 if (buffer[32] & 0x80)
2899                         sdkp->unmap_alignment =
2900                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2901
2902                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2903
2904                         if (sdkp->max_unmap_blocks)
2905                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2906                         else
2907                                 sd_config_discard(sdkp, SD_LBP_WS16);
2908
2909                 } else {        /* LBP VPD page tells us what to use */
2910                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2911                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2912                         else if (sdkp->lbpws)
2913                                 sd_config_discard(sdkp, SD_LBP_WS16);
2914                         else if (sdkp->lbpws10)
2915                                 sd_config_discard(sdkp, SD_LBP_WS10);
2916                         else
2917                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2918                 }
2919         }
2920
2921  out:
2922         kfree(buffer);
2923 }
2924
2925 /**
2926  * sd_read_block_characteristics - Query block dev. characteristics
2927  * @sdkp: disk to query
2928  */
2929 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2930 {
2931         struct request_queue *q = sdkp->disk->queue;
2932         unsigned char *buffer;
2933         u16 rot;
2934         const int vpd_len = 64;
2935
2936         buffer = kmalloc(vpd_len, GFP_KERNEL);
2937
2938         if (!buffer ||
2939             /* Block Device Characteristics VPD */
2940             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2941                 goto out;
2942
2943         rot = get_unaligned_be16(&buffer[4]);
2944
2945         if (rot == 1) {
2946                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2947                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2948         } else {
2949                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
2950                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
2951         }
2952
2953         if (sdkp->device->type == TYPE_ZBC) {
2954                 /* Host-managed */
2955                 q->limits.zoned = BLK_ZONED_HM;
2956         } else {
2957                 sdkp->zoned = (buffer[8] >> 4) & 3;
2958                 if (sdkp->zoned == 1)
2959                         /* Host-aware */
2960                         q->limits.zoned = BLK_ZONED_HA;
2961                 else
2962                         /*
2963                          * Treat drive-managed devices as
2964                          * regular block devices.
2965                          */
2966                         q->limits.zoned = BLK_ZONED_NONE;
2967         }
2968         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2969                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2970                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2971
2972  out:
2973         kfree(buffer);
2974 }
2975
2976 /**
2977  * sd_read_block_provisioning - Query provisioning VPD page
2978  * @sdkp: disk to query
2979  */
2980 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2981 {
2982         unsigned char *buffer;
2983         const int vpd_len = 8;
2984
2985         if (sdkp->lbpme == 0)
2986                 return;
2987
2988         buffer = kmalloc(vpd_len, GFP_KERNEL);
2989
2990         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2991                 goto out;
2992
2993         sdkp->lbpvpd    = 1;
2994         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2995         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2996         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2997
2998  out:
2999         kfree(buffer);
3000 }
3001
3002 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3003 {
3004         struct scsi_device *sdev = sdkp->device;
3005
3006         if (sdev->host->no_write_same) {
3007                 sdev->no_write_same = 1;
3008
3009                 return;
3010         }
3011
3012         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3013                 /* too large values might cause issues with arcmsr */
3014                 int vpd_buf_len = 64;
3015
3016                 sdev->no_report_opcodes = 1;
3017
3018                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3019                  * CODES is unsupported and the device has an ATA
3020                  * Information VPD page (SAT).
3021                  */
3022                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3023                         sdev->no_write_same = 1;
3024         }
3025
3026         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3027                 sdkp->ws16 = 1;
3028
3029         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3030                 sdkp->ws10 = 1;
3031 }
3032
3033 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3034 {
3035         struct scsi_device *sdev = sdkp->device;
3036
3037         if (!sdev->security_supported)
3038                 return;
3039
3040         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3041                         SECURITY_PROTOCOL_IN) == 1 &&
3042             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3043                         SECURITY_PROTOCOL_OUT) == 1)
3044                 sdkp->security = 1;
3045 }
3046
3047 /**
3048  *      sd_revalidate_disk - called the first time a new disk is seen,
3049  *      performs disk spin up, read_capacity, etc.
3050  *      @disk: struct gendisk we care about
3051  **/
3052 static int sd_revalidate_disk(struct gendisk *disk)
3053 {
3054         struct scsi_disk *sdkp = scsi_disk(disk);
3055         struct scsi_device *sdp = sdkp->device;
3056         struct request_queue *q = sdkp->disk->queue;
3057         sector_t old_capacity = sdkp->capacity;
3058         unsigned char *buffer;
3059         unsigned int dev_max, rw_max;
3060
3061         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3062                                       "sd_revalidate_disk\n"));
3063
3064         /*
3065          * If the device is offline, don't try and read capacity or any
3066          * of the other niceties.
3067          */
3068         if (!scsi_device_online(sdp))
3069                 goto out;
3070
3071         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3072         if (!buffer) {
3073                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3074                           "allocation failure.\n");
3075                 goto out;
3076         }
3077
3078         sd_spinup_disk(sdkp);
3079
3080         /*
3081          * Without media there is no reason to ask; moreover, some devices
3082          * react badly if we do.
3083          */
3084         if (sdkp->media_present) {
3085                 sd_read_capacity(sdkp, buffer);
3086
3087                 if (scsi_device_supports_vpd(sdp)) {
3088                         sd_read_block_provisioning(sdkp);
3089                         sd_read_block_limits(sdkp);
3090                         sd_read_block_characteristics(sdkp);
3091                         sd_zbc_read_zones(sdkp, buffer);
3092                 }
3093
3094                 sd_print_capacity(sdkp, old_capacity);
3095
3096                 sd_read_write_protect_flag(sdkp, buffer);
3097                 sd_read_cache_type(sdkp, buffer);
3098                 sd_read_app_tag_own(sdkp, buffer);
3099                 sd_read_write_same(sdkp, buffer);
3100                 sd_read_security(sdkp, buffer);
3101         }
3102
3103         /*
3104          * We now have all cache related info, determine how we deal
3105          * with flush requests.
3106          */
3107         sd_set_flush_flag(sdkp);
3108
3109         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3110         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3111
3112         /* Some devices report a maximum block count for READ/WRITE requests. */
3113         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3114         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3115
3116         /*
3117          * Determine the device's preferred I/O size for reads and writes
3118          * unless the reported value is unreasonably small, large, or
3119          * garbage.
3120          */
3121         if (sdkp->opt_xfer_blocks &&
3122             sdkp->opt_xfer_blocks <= dev_max &&
3123             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3124             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3125                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3126                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3127         } else
3128                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3129                                       (sector_t)BLK_DEF_MAX_SECTORS);
3130
3131         /* Do not exceed controller limit */
3132         rw_max = min(rw_max, queue_max_hw_sectors(q));
3133
3134         /*
3135          * Only update max_sectors if previously unset or if the current value
3136          * exceeds the capabilities of the hardware.
3137          */
3138         if (sdkp->first_scan ||
3139             q->limits.max_sectors > q->limits.max_dev_sectors ||
3140             q->limits.max_sectors > q->limits.max_hw_sectors)
3141                 q->limits.max_sectors = rw_max;
3142
3143         sdkp->first_scan = 0;
3144
3145         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3146         sd_config_write_same(sdkp);
3147         kfree(buffer);
3148
3149  out:
3150         return 0;
3151 }
3152
3153 /**
3154  *      sd_unlock_native_capacity - unlock native capacity
3155  *      @disk: struct gendisk to set capacity for
3156  *
3157  *      Block layer calls this function if it detects that partitions
3158  *      on @disk reach beyond the end of the device.  If the SCSI host
3159  *      implements ->unlock_native_capacity() method, it's invoked to
3160  *      give it a chance to adjust the device capacity.
3161  *
3162  *      CONTEXT:
3163  *      Defined by block layer.  Might sleep.
3164  */
3165 static void sd_unlock_native_capacity(struct gendisk *disk)
3166 {
3167         struct scsi_device *sdev = scsi_disk(disk)->device;
3168
3169         if (sdev->host->hostt->unlock_native_capacity)
3170                 sdev->host->hostt->unlock_native_capacity(sdev);
3171 }
3172
3173 /**
3174  *      sd_format_disk_name - format disk name
3175  *      @prefix: name prefix - ie. "sd" for SCSI disks
3176  *      @index: index of the disk to format name for
3177  *      @buf: output buffer
3178  *      @buflen: length of the output buffer
3179  *
3180  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3181  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3182  *      which is followed by sdaaa.
3183  *
3184  *      This is basically 26 base counting with one extra 'nil' entry
3185  *      at the beginning from the second digit on and can be
3186  *      determined using similar method as 26 base conversion with the
3187  *      index shifted -1 after each digit is computed.
3188  *
3189  *      CONTEXT:
3190  *      Don't care.
3191  *
3192  *      RETURNS:
3193  *      0 on success, -errno on failure.
3194  */
3195 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3196 {
3197         const int base = 'z' - 'a' + 1;
3198         char *begin = buf + strlen(prefix);
3199         char *end = buf + buflen;
3200         char *p;
3201         int unit;
3202
3203         p = end - 1;
3204         *p = '\0';
3205         unit = base;
3206         do {
3207                 if (p == begin)
3208                         return -EINVAL;
3209                 *--p = 'a' + (index % unit);
3210                 index = (index / unit) - 1;
3211         } while (index >= 0);
3212
3213         memmove(begin, p, end - p);
3214         memcpy(buf, prefix, strlen(prefix));
3215
3216         return 0;
3217 }
3218
3219 /*
3220  * The asynchronous part of sd_probe
3221  */
3222 static void sd_probe_async(void *data, async_cookie_t cookie)
3223 {
3224         struct scsi_disk *sdkp = data;
3225         struct scsi_device *sdp;
3226         struct gendisk *gd;
3227         u32 index;
3228         struct device *dev;
3229
3230         sdp = sdkp->device;