0f96eb0ddbfaeffb771b7a92a5ab33c4b3e22c76
[sfrench/cifs-2.6.git] / drivers / scsi / sd.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *      sd.c Copyright (C) 1992 Drew Eckhardt
4  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5  *
6  *      Linux scsi disk driver
7  *              Initial versions: Drew Eckhardt
8  *              Subsequent revisions: Eric Youngdale
9  *      Modification history:
10  *       - Drew Eckhardt <drew@colorado.edu> original
11  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
12  *         outstanding request, and other enhancements.
13  *         Support loadable low-level scsi drivers.
14  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
15  *         eight major numbers.
16  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
17  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
18  *         sd_init and cleanups.
19  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
20  *         not being read in sd_open. Fix problem where removable media 
21  *         could be ejected after sd_open.
22  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
23  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
24  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
25  *         Support 32k/1M disks.
26  *
27  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
28  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
29  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
30  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
31  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
32  *      Note: when the logging level is set by the user, it must be greater
33  *      than the level indicated above to trigger output.       
34  */
35
36 #include <linux/module.h>
37 #include <linux/fs.h>
38 #include <linux/kernel.h>
39 #include <linux/mm.h>
40 #include <linux/bio.h>
41 #include <linux/genhd.h>
42 #include <linux/hdreg.h>
43 #include <linux/errno.h>
44 #include <linux/idr.h>
45 #include <linux/interrupt.h>
46 #include <linux/init.h>
47 #include <linux/blkdev.h>
48 #include <linux/blkpg.h>
49 #include <linux/blk-pm.h>
50 #include <linux/delay.h>
51 #include <linux/mutex.h>
52 #include <linux/string_helpers.h>
53 #include <linux/async.h>
54 #include <linux/slab.h>
55 #include <linux/sed-opal.h>
56 #include <linux/pm_runtime.h>
57 #include <linux/pr.h>
58 #include <linux/t10-pi.h>
59 #include <linux/uaccess.h>
60 #include <asm/unaligned.h>
61
62 #include <scsi/scsi.h>
63 #include <scsi/scsi_cmnd.h>
64 #include <scsi/scsi_dbg.h>
65 #include <scsi/scsi_device.h>
66 #include <scsi/scsi_driver.h>
67 #include <scsi/scsi_eh.h>
68 #include <scsi/scsi_host.h>
69 #include <scsi/scsi_ioctl.h>
70 #include <scsi/scsicam.h>
71
72 #include "sd.h"
73 #include "scsi_priv.h"
74 #include "scsi_logging.h"
75
76 MODULE_AUTHOR("Eric Youngdale");
77 MODULE_DESCRIPTION("SCSI disk (sd) driver");
78 MODULE_LICENSE("GPL");
79
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
96 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
97 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
98 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
99 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
100
101 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
102 #define SD_MINORS       16
103 #else
104 #define SD_MINORS       0
105 #endif
106
107 static void sd_config_discard(struct scsi_disk *, unsigned int);
108 static void sd_config_write_same(struct scsi_disk *);
109 static int  sd_revalidate_disk(struct gendisk *);
110 static void sd_unlock_native_capacity(struct gendisk *disk);
111 static int  sd_probe(struct device *);
112 static int  sd_remove(struct device *);
113 static void sd_shutdown(struct device *);
114 static int sd_suspend_system(struct device *);
115 static int sd_suspend_runtime(struct device *);
116 static int sd_resume(struct device *);
117 static void sd_rescan(struct device *);
118 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
119 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
120 static int sd_done(struct scsi_cmnd *);
121 static void sd_eh_reset(struct scsi_cmnd *);
122 static int sd_eh_action(struct scsi_cmnd *, int);
123 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
124 static void scsi_disk_release(struct device *cdev);
125 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
126 static void sd_print_result(const struct scsi_disk *, const char *, int);
127
128 static DEFINE_IDA(sd_index_ida);
129
130 /* This semaphore is used to mediate the 0->1 reference get in the
131  * face of object destruction (i.e. we can't allow a get on an
132  * object after last put) */
133 static DEFINE_MUTEX(sd_ref_mutex);
134
135 static struct kmem_cache *sd_cdb_cache;
136 static mempool_t *sd_cdb_pool;
137 static mempool_t *sd_page_pool;
138
139 static const char *sd_cache_types[] = {
140         "write through", "none", "write back",
141         "write back, no read (daft)"
142 };
143
144 static void sd_set_flush_flag(struct scsi_disk *sdkp)
145 {
146         bool wc = false, fua = false;
147
148         if (sdkp->WCE) {
149                 wc = true;
150                 if (sdkp->DPOFUA)
151                         fua = true;
152         }
153
154         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
155 }
156
157 static ssize_t
158 cache_type_store(struct device *dev, struct device_attribute *attr,
159                  const char *buf, size_t count)
160 {
161         int ct, rcd, wce, sp;
162         struct scsi_disk *sdkp = to_scsi_disk(dev);
163         struct scsi_device *sdp = sdkp->device;
164         char buffer[64];
165         char *buffer_data;
166         struct scsi_mode_data data;
167         struct scsi_sense_hdr sshdr;
168         static const char temp[] = "temporary ";
169         int len;
170
171         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
172                 /* no cache control on RBC devices; theoretically they
173                  * can do it, but there's probably so many exceptions
174                  * it's not worth the risk */
175                 return -EINVAL;
176
177         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
178                 buf += sizeof(temp) - 1;
179                 sdkp->cache_override = 1;
180         } else {
181                 sdkp->cache_override = 0;
182         }
183
184         ct = sysfs_match_string(sd_cache_types, buf);
185         if (ct < 0)
186                 return -EINVAL;
187
188         rcd = ct & 0x01 ? 1 : 0;
189         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
190
191         if (sdkp->cache_override) {
192                 sdkp->WCE = wce;
193                 sdkp->RCD = rcd;
194                 sd_set_flush_flag(sdkp);
195                 return count;
196         }
197
198         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199                             SD_MAX_RETRIES, &data, NULL))
200                 return -EINVAL;
201         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
202                   data.block_descriptor_length);
203         buffer_data = buffer + data.header_length +
204                 data.block_descriptor_length;
205         buffer_data[2] &= ~0x05;
206         buffer_data[2] |= wce << 2 | rcd;
207         sp = buffer_data[0] & 0x80 ? 1 : 0;
208         buffer_data[0] &= ~0x80;
209
210         /*
211          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
212          * received mode parameter buffer before doing MODE SELECT.
213          */
214         data.device_specific = 0;
215
216         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
217                              SD_MAX_RETRIES, &data, &sshdr)) {
218                 if (scsi_sense_valid(&sshdr))
219                         sd_print_sense_hdr(sdkp, &sshdr);
220                 return -EINVAL;
221         }
222         revalidate_disk(sdkp->disk);
223         return count;
224 }
225
226 static ssize_t
227 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
228                        char *buf)
229 {
230         struct scsi_disk *sdkp = to_scsi_disk(dev);
231         struct scsi_device *sdp = sdkp->device;
232
233         return sprintf(buf, "%u\n", sdp->manage_start_stop);
234 }
235
236 static ssize_t
237 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
238                         const char *buf, size_t count)
239 {
240         struct scsi_disk *sdkp = to_scsi_disk(dev);
241         struct scsi_device *sdp = sdkp->device;
242         bool v;
243
244         if (!capable(CAP_SYS_ADMIN))
245                 return -EACCES;
246
247         if (kstrtobool(buf, &v))
248                 return -EINVAL;
249
250         sdp->manage_start_stop = v;
251
252         return count;
253 }
254 static DEVICE_ATTR_RW(manage_start_stop);
255
256 static ssize_t
257 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
258 {
259         struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
262 }
263
264 static ssize_t
265 allow_restart_store(struct device *dev, struct device_attribute *attr,
266                     const char *buf, size_t count)
267 {
268         bool v;
269         struct scsi_disk *sdkp = to_scsi_disk(dev);
270         struct scsi_device *sdp = sdkp->device;
271
272         if (!capable(CAP_SYS_ADMIN))
273                 return -EACCES;
274
275         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
276                 return -EINVAL;
277
278         if (kstrtobool(buf, &v))
279                 return -EINVAL;
280
281         sdp->allow_restart = v;
282
283         return count;
284 }
285 static DEVICE_ATTR_RW(allow_restart);
286
287 static ssize_t
288 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
289 {
290         struct scsi_disk *sdkp = to_scsi_disk(dev);
291         int ct = sdkp->RCD + 2*sdkp->WCE;
292
293         return sprintf(buf, "%s\n", sd_cache_types[ct]);
294 }
295 static DEVICE_ATTR_RW(cache_type);
296
297 static ssize_t
298 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
299 {
300         struct scsi_disk *sdkp = to_scsi_disk(dev);
301
302         return sprintf(buf, "%u\n", sdkp->DPOFUA);
303 }
304 static DEVICE_ATTR_RO(FUA);
305
306 static ssize_t
307 protection_type_show(struct device *dev, struct device_attribute *attr,
308                      char *buf)
309 {
310         struct scsi_disk *sdkp = to_scsi_disk(dev);
311
312         return sprintf(buf, "%u\n", sdkp->protection_type);
313 }
314
315 static ssize_t
316 protection_type_store(struct device *dev, struct device_attribute *attr,
317                       const char *buf, size_t count)
318 {
319         struct scsi_disk *sdkp = to_scsi_disk(dev);
320         unsigned int val;
321         int err;
322
323         if (!capable(CAP_SYS_ADMIN))
324                 return -EACCES;
325
326         err = kstrtouint(buf, 10, &val);
327
328         if (err)
329                 return err;
330
331         if (val <= T10_PI_TYPE3_PROTECTION)
332                 sdkp->protection_type = val;
333
334         return count;
335 }
336 static DEVICE_ATTR_RW(protection_type);
337
338 static ssize_t
339 protection_mode_show(struct device *dev, struct device_attribute *attr,
340                      char *buf)
341 {
342         struct scsi_disk *sdkp = to_scsi_disk(dev);
343         struct scsi_device *sdp = sdkp->device;
344         unsigned int dif, dix;
345
346         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
347         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
348
349         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
350                 dif = 0;
351                 dix = 1;
352         }
353
354         if (!dif && !dix)
355                 return sprintf(buf, "none\n");
356
357         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
358 }
359 static DEVICE_ATTR_RO(protection_mode);
360
361 static ssize_t
362 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
363 {
364         struct scsi_disk *sdkp = to_scsi_disk(dev);
365
366         return sprintf(buf, "%u\n", sdkp->ATO);
367 }
368 static DEVICE_ATTR_RO(app_tag_own);
369
370 static ssize_t
371 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
372                        char *buf)
373 {
374         struct scsi_disk *sdkp = to_scsi_disk(dev);
375
376         return sprintf(buf, "%u\n", sdkp->lbpme);
377 }
378 static DEVICE_ATTR_RO(thin_provisioning);
379
380 /* sysfs_match_string() requires dense arrays */
381 static const char *lbp_mode[] = {
382         [SD_LBP_FULL]           = "full",
383         [SD_LBP_UNMAP]          = "unmap",
384         [SD_LBP_WS16]           = "writesame_16",
385         [SD_LBP_WS10]           = "writesame_10",
386         [SD_LBP_ZERO]           = "writesame_zero",
387         [SD_LBP_DISABLE]        = "disabled",
388 };
389
390 static ssize_t
391 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
392                        char *buf)
393 {
394         struct scsi_disk *sdkp = to_scsi_disk(dev);
395
396         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
397 }
398
399 static ssize_t
400 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
401                         const char *buf, size_t count)
402 {
403         struct scsi_disk *sdkp = to_scsi_disk(dev);
404         struct scsi_device *sdp = sdkp->device;
405         int mode;
406
407         if (!capable(CAP_SYS_ADMIN))
408                 return -EACCES;
409
410         if (sd_is_zoned(sdkp)) {
411                 sd_config_discard(sdkp, SD_LBP_DISABLE);
412                 return count;
413         }
414
415         if (sdp->type != TYPE_DISK)
416                 return -EINVAL;
417
418         mode = sysfs_match_string(lbp_mode, buf);
419         if (mode < 0)
420                 return -EINVAL;
421
422         sd_config_discard(sdkp, mode);
423
424         return count;
425 }
426 static DEVICE_ATTR_RW(provisioning_mode);
427
428 /* sysfs_match_string() requires dense arrays */
429 static const char *zeroing_mode[] = {
430         [SD_ZERO_WRITE]         = "write",
431         [SD_ZERO_WS]            = "writesame",
432         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
433         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
434 };
435
436 static ssize_t
437 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
438                   char *buf)
439 {
440         struct scsi_disk *sdkp = to_scsi_disk(dev);
441
442         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
443 }
444
445 static ssize_t
446 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
447                    const char *buf, size_t count)
448 {
449         struct scsi_disk *sdkp = to_scsi_disk(dev);
450         int mode;
451
452         if (!capable(CAP_SYS_ADMIN))
453                 return -EACCES;
454
455         mode = sysfs_match_string(zeroing_mode, buf);
456         if (mode < 0)
457                 return -EINVAL;
458
459         sdkp->zeroing_mode = mode;
460
461         return count;
462 }
463 static DEVICE_ATTR_RW(zeroing_mode);
464
465 static ssize_t
466 max_medium_access_timeouts_show(struct device *dev,
467                                 struct device_attribute *attr, char *buf)
468 {
469         struct scsi_disk *sdkp = to_scsi_disk(dev);
470
471         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
472 }
473
474 static ssize_t
475 max_medium_access_timeouts_store(struct device *dev,
476                                  struct device_attribute *attr, const char *buf,
477                                  size_t count)
478 {
479         struct scsi_disk *sdkp = to_scsi_disk(dev);
480         int err;
481
482         if (!capable(CAP_SYS_ADMIN))
483                 return -EACCES;
484
485         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
486
487         return err ? err : count;
488 }
489 static DEVICE_ATTR_RW(max_medium_access_timeouts);
490
491 static ssize_t
492 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
493                            char *buf)
494 {
495         struct scsi_disk *sdkp = to_scsi_disk(dev);
496
497         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
498 }
499
500 static ssize_t
501 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
502                             const char *buf, size_t count)
503 {
504         struct scsi_disk *sdkp = to_scsi_disk(dev);
505         struct scsi_device *sdp = sdkp->device;
506         unsigned long max;
507         int err;
508
509         if (!capable(CAP_SYS_ADMIN))
510                 return -EACCES;
511
512         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
513                 return -EINVAL;
514
515         err = kstrtoul(buf, 10, &max);
516
517         if (err)
518                 return err;
519
520         if (max == 0)
521                 sdp->no_write_same = 1;
522         else if (max <= SD_MAX_WS16_BLOCKS) {
523                 sdp->no_write_same = 0;
524                 sdkp->max_ws_blocks = max;
525         }
526
527         sd_config_write_same(sdkp);
528
529         return count;
530 }
531 static DEVICE_ATTR_RW(max_write_same_blocks);
532
533 static struct attribute *sd_disk_attrs[] = {
534         &dev_attr_cache_type.attr,
535         &dev_attr_FUA.attr,
536         &dev_attr_allow_restart.attr,
537         &dev_attr_manage_start_stop.attr,
538         &dev_attr_protection_type.attr,
539         &dev_attr_protection_mode.attr,
540         &dev_attr_app_tag_own.attr,
541         &dev_attr_thin_provisioning.attr,
542         &dev_attr_provisioning_mode.attr,
543         &dev_attr_zeroing_mode.attr,
544         &dev_attr_max_write_same_blocks.attr,
545         &dev_attr_max_medium_access_timeouts.attr,
546         NULL,
547 };
548 ATTRIBUTE_GROUPS(sd_disk);
549
550 static struct class sd_disk_class = {
551         .name           = "scsi_disk",
552         .owner          = THIS_MODULE,
553         .dev_release    = scsi_disk_release,
554         .dev_groups     = sd_disk_groups,
555 };
556
557 static const struct dev_pm_ops sd_pm_ops = {
558         .suspend                = sd_suspend_system,
559         .resume                 = sd_resume,
560         .poweroff               = sd_suspend_system,
561         .restore                = sd_resume,
562         .runtime_suspend        = sd_suspend_runtime,
563         .runtime_resume         = sd_resume,
564 };
565
566 static struct scsi_driver sd_template = {
567         .gendrv = {
568                 .name           = "sd",
569                 .owner          = THIS_MODULE,
570                 .probe          = sd_probe,
571                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
572                 .remove         = sd_remove,
573                 .shutdown       = sd_shutdown,
574                 .pm             = &sd_pm_ops,
575         },
576         .rescan                 = sd_rescan,
577         .init_command           = sd_init_command,
578         .uninit_command         = sd_uninit_command,
579         .done                   = sd_done,
580         .eh_action              = sd_eh_action,
581         .eh_reset               = sd_eh_reset,
582 };
583
584 /*
585  * Dummy kobj_map->probe function.
586  * The default ->probe function will call modprobe, which is
587  * pointless as this module is already loaded.
588  */
589 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
590 {
591         return NULL;
592 }
593
594 /*
595  * Device no to disk mapping:
596  * 
597  *       major         disc2     disc  p1
598  *   |............|.............|....|....| <- dev_t
599  *    31        20 19          8 7  4 3  0
600  * 
601  * Inside a major, we have 16k disks, however mapped non-
602  * contiguously. The first 16 disks are for major0, the next
603  * ones with major1, ... Disk 256 is for major0 again, disk 272 
604  * for major1, ... 
605  * As we stay compatible with our numbering scheme, we can reuse 
606  * the well-know SCSI majors 8, 65--71, 136--143.
607  */
608 static int sd_major(int major_idx)
609 {
610         switch (major_idx) {
611         case 0:
612                 return SCSI_DISK0_MAJOR;
613         case 1 ... 7:
614                 return SCSI_DISK1_MAJOR + major_idx - 1;
615         case 8 ... 15:
616                 return SCSI_DISK8_MAJOR + major_idx - 8;
617         default:
618                 BUG();
619                 return 0;       /* shut up gcc */
620         }
621 }
622
623 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
624 {
625         struct scsi_disk *sdkp = NULL;
626
627         mutex_lock(&sd_ref_mutex);
628
629         if (disk->private_data) {
630                 sdkp = scsi_disk(disk);
631                 if (scsi_device_get(sdkp->device) == 0)
632                         get_device(&sdkp->dev);
633                 else
634                         sdkp = NULL;
635         }
636         mutex_unlock(&sd_ref_mutex);
637         return sdkp;
638 }
639
640 static void scsi_disk_put(struct scsi_disk *sdkp)
641 {
642         struct scsi_device *sdev = sdkp->device;
643
644         mutex_lock(&sd_ref_mutex);
645         put_device(&sdkp->dev);
646         scsi_device_put(sdev);
647         mutex_unlock(&sd_ref_mutex);
648 }
649
650 #ifdef CONFIG_BLK_SED_OPAL
651 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
652                 size_t len, bool send)
653 {
654         struct scsi_device *sdev = data;
655         u8 cdb[12] = { 0, };
656         int ret;
657
658         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
659         cdb[1] = secp;
660         put_unaligned_be16(spsp, &cdb[2]);
661         put_unaligned_be32(len, &cdb[6]);
662
663         ret = scsi_execute_req(sdev, cdb,
664                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
665                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
666         return ret <= 0 ? ret : -EIO;
667 }
668 #endif /* CONFIG_BLK_SED_OPAL */
669
670 /*
671  * Look up the DIX operation based on whether the command is read or
672  * write and whether dix and dif are enabled.
673  */
674 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
675 {
676         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
677         static const unsigned int ops[] = {     /* wrt dix dif */
678                 SCSI_PROT_NORMAL,               /*  0   0   0  */
679                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
680                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
681                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
682                 SCSI_PROT_NORMAL,               /*  1   0   0  */
683                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
684                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
685                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
686         };
687
688         return ops[write << 2 | dix << 1 | dif];
689 }
690
691 /*
692  * Returns a mask of the protection flags that are valid for a given DIX
693  * operation.
694  */
695 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
696 {
697         static const unsigned int flag_mask[] = {
698                 [SCSI_PROT_NORMAL]              = 0,
699
700                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
701                                                   SCSI_PROT_GUARD_CHECK |
702                                                   SCSI_PROT_REF_CHECK |
703                                                   SCSI_PROT_REF_INCREMENT,
704
705                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
706                                                   SCSI_PROT_IP_CHECKSUM,
707
708                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
709                                                   SCSI_PROT_GUARD_CHECK |
710                                                   SCSI_PROT_REF_CHECK |
711                                                   SCSI_PROT_REF_INCREMENT |
712                                                   SCSI_PROT_IP_CHECKSUM,
713
714                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
715                                                   SCSI_PROT_REF_INCREMENT,
716
717                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
718                                                   SCSI_PROT_REF_CHECK |
719                                                   SCSI_PROT_REF_INCREMENT |
720                                                   SCSI_PROT_IP_CHECKSUM,
721
722                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
723                                                   SCSI_PROT_GUARD_CHECK |
724                                                   SCSI_PROT_REF_CHECK |
725                                                   SCSI_PROT_REF_INCREMENT |
726                                                   SCSI_PROT_IP_CHECKSUM,
727         };
728
729         return flag_mask[prot_op];
730 }
731
732 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
733                                            unsigned int dix, unsigned int dif)
734 {
735         struct bio *bio = scmd->request->bio;
736         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
737         unsigned int protect = 0;
738
739         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
740                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
741                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
742
743                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
744                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
745         }
746
747         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
748                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
749
750                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
751                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
752         }
753
754         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
755                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
756
757                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
758                         protect = 3 << 5;       /* Disable target PI checking */
759                 else
760                         protect = 1 << 5;       /* Enable target PI checking */
761         }
762
763         scsi_set_prot_op(scmd, prot_op);
764         scsi_set_prot_type(scmd, dif);
765         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
766
767         return protect;
768 }
769
770 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
771 {
772         struct request_queue *q = sdkp->disk->queue;
773         unsigned int logical_block_size = sdkp->device->sector_size;
774         unsigned int max_blocks = 0;
775
776         q->limits.discard_alignment =
777                 sdkp->unmap_alignment * logical_block_size;
778         q->limits.discard_granularity =
779                 max(sdkp->physical_block_size,
780                     sdkp->unmap_granularity * logical_block_size);
781         sdkp->provisioning_mode = mode;
782
783         switch (mode) {
784
785         case SD_LBP_FULL:
786         case SD_LBP_DISABLE:
787                 blk_queue_max_discard_sectors(q, 0);
788                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
789                 return;
790
791         case SD_LBP_UNMAP:
792                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
793                                           (u32)SD_MAX_WS16_BLOCKS);
794                 break;
795
796         case SD_LBP_WS16:
797                 if (sdkp->device->unmap_limit_for_ws)
798                         max_blocks = sdkp->max_unmap_blocks;
799                 else
800                         max_blocks = sdkp->max_ws_blocks;
801
802                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
803                 break;
804
805         case SD_LBP_WS10:
806                 if (sdkp->device->unmap_limit_for_ws)
807                         max_blocks = sdkp->max_unmap_blocks;
808                 else
809                         max_blocks = sdkp->max_ws_blocks;
810
811                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
812                 break;
813
814         case SD_LBP_ZERO:
815                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
816                                           (u32)SD_MAX_WS10_BLOCKS);
817                 break;
818         }
819
820         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
821         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
822 }
823
824 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
825 {
826         struct scsi_device *sdp = cmd->device;
827         struct request *rq = cmd->request;
828         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
829         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
830         unsigned int data_len = 24;
831         char *buf;
832
833         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
834         if (!rq->special_vec.bv_page)
835                 return BLK_STS_RESOURCE;
836         clear_highpage(rq->special_vec.bv_page);
837         rq->special_vec.bv_offset = 0;
838         rq->special_vec.bv_len = data_len;
839         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
840
841         cmd->cmd_len = 10;
842         cmd->cmnd[0] = UNMAP;
843         cmd->cmnd[8] = 24;
844
845         buf = page_address(rq->special_vec.bv_page);
846         put_unaligned_be16(6 + 16, &buf[0]);
847         put_unaligned_be16(16, &buf[2]);
848         put_unaligned_be64(lba, &buf[8]);
849         put_unaligned_be32(nr_blocks, &buf[16]);
850
851         cmd->allowed = SD_MAX_RETRIES;
852         cmd->transfersize = data_len;
853         rq->timeout = SD_TIMEOUT;
854
855         return scsi_init_io(cmd);
856 }
857
858 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
859                 bool unmap)
860 {
861         struct scsi_device *sdp = cmd->device;
862         struct request *rq = cmd->request;
863         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
864         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
865         u32 data_len = sdp->sector_size;
866
867         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
868         if (!rq->special_vec.bv_page)
869                 return BLK_STS_RESOURCE;
870         clear_highpage(rq->special_vec.bv_page);
871         rq->special_vec.bv_offset = 0;
872         rq->special_vec.bv_len = data_len;
873         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
874
875         cmd->cmd_len = 16;
876         cmd->cmnd[0] = WRITE_SAME_16;
877         if (unmap)
878                 cmd->cmnd[1] = 0x8; /* UNMAP */
879         put_unaligned_be64(lba, &cmd->cmnd[2]);
880         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
881
882         cmd->allowed = SD_MAX_RETRIES;
883         cmd->transfersize = data_len;
884         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
885
886         return scsi_init_io(cmd);
887 }
888
889 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
890                 bool unmap)
891 {
892         struct scsi_device *sdp = cmd->device;
893         struct request *rq = cmd->request;
894         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
895         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
896         u32 data_len = sdp->sector_size;
897
898         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
899         if (!rq->special_vec.bv_page)
900                 return BLK_STS_RESOURCE;
901         clear_highpage(rq->special_vec.bv_page);
902         rq->special_vec.bv_offset = 0;
903         rq->special_vec.bv_len = data_len;
904         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
905
906         cmd->cmd_len = 10;
907         cmd->cmnd[0] = WRITE_SAME;
908         if (unmap)
909                 cmd->cmnd[1] = 0x8; /* UNMAP */
910         put_unaligned_be32(lba, &cmd->cmnd[2]);
911         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
912
913         cmd->allowed = SD_MAX_RETRIES;
914         cmd->transfersize = data_len;
915         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
916
917         return scsi_init_io(cmd);
918 }
919
920 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
921 {
922         struct request *rq = cmd->request;
923         struct scsi_device *sdp = cmd->device;
924         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
925         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
926         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
927
928         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
929                 switch (sdkp->zeroing_mode) {
930                 case SD_ZERO_WS16_UNMAP:
931                         return sd_setup_write_same16_cmnd(cmd, true);
932                 case SD_ZERO_WS10_UNMAP:
933                         return sd_setup_write_same10_cmnd(cmd, true);
934                 }
935         }
936
937         if (sdp->no_write_same)
938                 return BLK_STS_TARGET;
939
940         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
941                 return sd_setup_write_same16_cmnd(cmd, false);
942
943         return sd_setup_write_same10_cmnd(cmd, false);
944 }
945
946 static void sd_config_write_same(struct scsi_disk *sdkp)
947 {
948         struct request_queue *q = sdkp->disk->queue;
949         unsigned int logical_block_size = sdkp->device->sector_size;
950
951         if (sdkp->device->no_write_same) {
952                 sdkp->max_ws_blocks = 0;
953                 goto out;
954         }
955
956         /* Some devices can not handle block counts above 0xffff despite
957          * supporting WRITE SAME(16). Consequently we default to 64k
958          * blocks per I/O unless the device explicitly advertises a
959          * bigger limit.
960          */
961         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
962                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
963                                                    (u32)SD_MAX_WS16_BLOCKS);
964         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
965                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
966                                                    (u32)SD_MAX_WS10_BLOCKS);
967         else {
968                 sdkp->device->no_write_same = 1;
969                 sdkp->max_ws_blocks = 0;
970         }
971
972         if (sdkp->lbprz && sdkp->lbpws)
973                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
974         else if (sdkp->lbprz && sdkp->lbpws10)
975                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
976         else if (sdkp->max_ws_blocks)
977                 sdkp->zeroing_mode = SD_ZERO_WS;
978         else
979                 sdkp->zeroing_mode = SD_ZERO_WRITE;
980
981         if (sdkp->max_ws_blocks &&
982             sdkp->physical_block_size > logical_block_size) {
983                 /*
984                  * Reporting a maximum number of blocks that is not aligned
985                  * on the device physical size would cause a large write same
986                  * request to be split into physically unaligned chunks by
987                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
988                  * even if the caller of these functions took care to align the
989                  * large request. So make sure the maximum reported is aligned
990                  * to the device physical block size. This is only an optional
991                  * optimization for regular disks, but this is mandatory to
992                  * avoid failure of large write same requests directed at
993                  * sequential write required zones of host-managed ZBC disks.
994                  */
995                 sdkp->max_ws_blocks =
996                         round_down(sdkp->max_ws_blocks,
997                                    bytes_to_logical(sdkp->device,
998                                                     sdkp->physical_block_size));
999         }
1000
1001 out:
1002         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1003                                          (logical_block_size >> 9));
1004         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1005                                          (logical_block_size >> 9));
1006 }
1007
1008 /**
1009  * sd_setup_write_same_cmnd - write the same data to multiple blocks
1010  * @cmd: command to prepare
1011  *
1012  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1013  * the preference indicated by the target device.
1014  **/
1015 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1016 {
1017         struct request *rq = cmd->request;
1018         struct scsi_device *sdp = cmd->device;
1019         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1020         struct bio *bio = rq->bio;
1021         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1022         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1023         blk_status_t ret;
1024
1025         if (sdkp->device->no_write_same)
1026                 return BLK_STS_TARGET;
1027
1028         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1029
1030         rq->timeout = SD_WRITE_SAME_TIMEOUT;
1031
1032         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1033                 cmd->cmd_len = 16;
1034                 cmd->cmnd[0] = WRITE_SAME_16;
1035                 put_unaligned_be64(lba, &cmd->cmnd[2]);
1036                 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1037         } else {
1038                 cmd->cmd_len = 10;
1039                 cmd->cmnd[0] = WRITE_SAME;
1040                 put_unaligned_be32(lba, &cmd->cmnd[2]);
1041                 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1042         }
1043
1044         cmd->transfersize = sdp->sector_size;
1045         cmd->allowed = SD_MAX_RETRIES;
1046
1047         /*
1048          * For WRITE SAME the data transferred via the DATA OUT buffer is
1049          * different from the amount of data actually written to the target.
1050          *
1051          * We set up __data_len to the amount of data transferred via the
1052          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1053          * to transfer a single sector of data first, but then reset it to
1054          * the amount of data to be written right after so that the I/O path
1055          * knows how much to actually write.
1056          */
1057         rq->__data_len = sdp->sector_size;
1058         ret = scsi_init_io(cmd);
1059         rq->__data_len = blk_rq_bytes(rq);
1060
1061         return ret;
1062 }
1063
1064 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1065 {
1066         struct request *rq = cmd->request;
1067
1068         /* flush requests don't perform I/O, zero the S/G table */
1069         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1070
1071         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1072         cmd->cmd_len = 10;
1073         cmd->transfersize = 0;
1074         cmd->allowed = SD_MAX_RETRIES;
1075
1076         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1077         return BLK_STS_OK;
1078 }
1079
1080 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1081                                        sector_t lba, unsigned int nr_blocks,
1082                                        unsigned char flags)
1083 {
1084         cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1085         if (unlikely(cmd->cmnd == NULL))
1086                 return BLK_STS_RESOURCE;
1087
1088         cmd->cmd_len = SD_EXT_CDB_SIZE;
1089         memset(cmd->cmnd, 0, cmd->cmd_len);
1090
1091         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1092         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1093         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1094         cmd->cmnd[10] = flags;
1095         put_unaligned_be64(lba, &cmd->cmnd[12]);
1096         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1097         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1098
1099         return BLK_STS_OK;
1100 }
1101
1102 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1103                                        sector_t lba, unsigned int nr_blocks,
1104                                        unsigned char flags)
1105 {
1106         cmd->cmd_len  = 16;
1107         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1108         cmd->cmnd[1]  = flags;
1109         cmd->cmnd[14] = 0;
1110         cmd->cmnd[15] = 0;
1111         put_unaligned_be64(lba, &cmd->cmnd[2]);
1112         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1113
1114         return BLK_STS_OK;
1115 }
1116
1117 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1118                                        sector_t lba, unsigned int nr_blocks,
1119                                        unsigned char flags)
1120 {
1121         cmd->cmd_len = 10;
1122         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1123         cmd->cmnd[1] = flags;
1124         cmd->cmnd[6] = 0;
1125         cmd->cmnd[9] = 0;
1126         put_unaligned_be32(lba, &cmd->cmnd[2]);
1127         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1128
1129         return BLK_STS_OK;
1130 }
1131
1132 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1133                                       sector_t lba, unsigned int nr_blocks,
1134                                       unsigned char flags)
1135 {
1136         /* Avoid that 0 blocks gets translated into 256 blocks. */
1137         if (WARN_ON_ONCE(nr_blocks == 0))
1138                 return BLK_STS_IOERR;
1139
1140         if (unlikely(flags & 0x8)) {
1141                 /*
1142                  * This happens only if this drive failed 10byte rw
1143                  * command with ILLEGAL_REQUEST during operation and
1144                  * thus turned off use_10_for_rw.
1145                  */
1146                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1147                 return BLK_STS_IOERR;
1148         }
1149
1150         cmd->cmd_len = 6;
1151         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1152         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1153         cmd->cmnd[2] = (lba >> 8) & 0xff;
1154         cmd->cmnd[3] = lba & 0xff;
1155         cmd->cmnd[4] = nr_blocks;
1156         cmd->cmnd[5] = 0;
1157
1158         return BLK_STS_OK;
1159 }
1160
1161 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1162 {
1163         struct request *rq = cmd->request;
1164         struct scsi_device *sdp = cmd->device;
1165         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1166         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1167         sector_t threshold;
1168         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1169         bool dif, dix;
1170         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1171         bool write = rq_data_dir(rq) == WRITE;
1172         unsigned char protect, fua;
1173         blk_status_t ret;
1174
1175         ret = scsi_init_io(cmd);
1176         if (ret != BLK_STS_OK)
1177                 return ret;
1178
1179         if (!scsi_device_online(sdp) || sdp->changed) {
1180                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1181                 return BLK_STS_IOERR;
1182         }
1183
1184         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1185                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1186                 return BLK_STS_IOERR;
1187         }
1188
1189         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1190                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1191                 return BLK_STS_IOERR;
1192         }
1193
1194         /*
1195          * Some SD card readers can't handle accesses which touch the
1196          * last one or two logical blocks. Split accesses as needed.
1197          */
1198         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1199
1200         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1201                 if (lba < threshold) {
1202                         /* Access up to the threshold but not beyond */
1203                         nr_blocks = threshold - lba;
1204                 } else {
1205                         /* Access only a single logical block */
1206                         nr_blocks = 1;
1207                 }
1208         }
1209
1210         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1211         dix = scsi_prot_sg_count(cmd);
1212         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1213
1214         if (write && dix)
1215                 t10_pi_prepare(cmd->request, sdkp->protection_type);
1216
1217         if (dif || dix)
1218                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1219         else
1220                 protect = 0;
1221
1222         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1223                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1224                                          protect | fua);
1225         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1226                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1227                                          protect | fua);
1228         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1229                    sdp->use_10_for_rw || protect) {
1230                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1231                                          protect | fua);
1232         } else {
1233                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1234                                         protect | fua);
1235         }
1236
1237         if (unlikely(ret != BLK_STS_OK))
1238                 return ret;
1239
1240         /*
1241          * We shouldn't disconnect in the middle of a sector, so with a dumb
1242          * host adapter, it's safe to assume that we can at least transfer
1243          * this many bytes between each connect / disconnect.
1244          */
1245         cmd->transfersize = sdp->sector_size;
1246         cmd->underflow = nr_blocks << 9;
1247         cmd->allowed = SD_MAX_RETRIES;
1248         cmd->sdb.length = nr_blocks * sdp->sector_size;
1249
1250         SCSI_LOG_HLQUEUE(1,
1251                          scmd_printk(KERN_INFO, cmd,
1252                                      "%s: block=%llu, count=%d\n", __func__,
1253                                      (unsigned long long)blk_rq_pos(rq),
1254                                      blk_rq_sectors(rq)));
1255         SCSI_LOG_HLQUEUE(2,
1256                          scmd_printk(KERN_INFO, cmd,
1257                                      "%s %d/%u 512 byte blocks.\n",
1258                                      write ? "writing" : "reading", nr_blocks,
1259                                      blk_rq_sectors(rq)));
1260
1261         /*
1262          * This indicates that the command is ready from our end to be
1263          * queued.
1264          */
1265         return BLK_STS_OK;
1266 }
1267
1268 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1269 {
1270         struct request *rq = cmd->request;
1271
1272         switch (req_op(rq)) {
1273         case REQ_OP_DISCARD:
1274                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1275                 case SD_LBP_UNMAP:
1276                         return sd_setup_unmap_cmnd(cmd);
1277                 case SD_LBP_WS16:
1278                         return sd_setup_write_same16_cmnd(cmd, true);
1279                 case SD_LBP_WS10:
1280                         return sd_setup_write_same10_cmnd(cmd, true);
1281                 case SD_LBP_ZERO:
1282                         return sd_setup_write_same10_cmnd(cmd, false);
1283                 default:
1284                         return BLK_STS_TARGET;
1285                 }
1286         case REQ_OP_WRITE_ZEROES:
1287                 return sd_setup_write_zeroes_cmnd(cmd);
1288         case REQ_OP_WRITE_SAME:
1289                 return sd_setup_write_same_cmnd(cmd);
1290         case REQ_OP_FLUSH:
1291                 return sd_setup_flush_cmnd(cmd);
1292         case REQ_OP_READ:
1293         case REQ_OP_WRITE:
1294                 return sd_setup_read_write_cmnd(cmd);
1295         case REQ_OP_ZONE_RESET:
1296                 return sd_zbc_setup_reset_cmnd(cmd);
1297         default:
1298                 WARN_ON_ONCE(1);
1299                 return BLK_STS_NOTSUPP;
1300         }
1301 }
1302
1303 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1304 {
1305         struct request *rq = SCpnt->request;
1306         u8 *cmnd;
1307
1308         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1309                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1310
1311         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1312                 cmnd = SCpnt->cmnd;
1313                 SCpnt->cmnd = NULL;
1314                 SCpnt->cmd_len = 0;
1315                 mempool_free(cmnd, sd_cdb_pool);
1316         }
1317 }
1318
1319 /**
1320  *      sd_open - open a scsi disk device
1321  *      @bdev: Block device of the scsi disk to open
1322  *      @mode: FMODE_* mask
1323  *
1324  *      Returns 0 if successful. Returns a negated errno value in case 
1325  *      of error.
1326  *
1327  *      Note: This can be called from a user context (e.g. fsck(1) )
1328  *      or from within the kernel (e.g. as a result of a mount(1) ).
1329  *      In the latter case @inode and @filp carry an abridged amount
1330  *      of information as noted above.
1331  *
1332  *      Locking: called with bdev->bd_mutex held.
1333  **/
1334 static int sd_open(struct block_device *bdev, fmode_t mode)
1335 {
1336         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1337         struct scsi_device *sdev;
1338         int retval;
1339
1340         if (!sdkp)
1341                 return -ENXIO;
1342
1343         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1344
1345         sdev = sdkp->device;
1346
1347         /*
1348          * If the device is in error recovery, wait until it is done.
1349          * If the device is offline, then disallow any access to it.
1350          */
1351         retval = -ENXIO;
1352         if (!scsi_block_when_processing_errors(sdev))
1353                 goto error_out;
1354
1355         if (sdev->removable || sdkp->write_prot)
1356                 check_disk_change(bdev);
1357
1358         /*
1359          * If the drive is empty, just let the open fail.
1360          */
1361         retval = -ENOMEDIUM;
1362         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1363                 goto error_out;
1364
1365         /*
1366          * If the device has the write protect tab set, have the open fail
1367          * if the user expects to be able to write to the thing.
1368          */
1369         retval = -EROFS;
1370         if (sdkp->write_prot && (mode & FMODE_WRITE))
1371                 goto error_out;
1372
1373         /*
1374          * It is possible that the disk changing stuff resulted in
1375          * the device being taken offline.  If this is the case,
1376          * report this to the user, and don't pretend that the
1377          * open actually succeeded.
1378          */
1379         retval = -ENXIO;
1380         if (!scsi_device_online(sdev))
1381                 goto error_out;
1382
1383         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1384                 if (scsi_block_when_processing_errors(sdev))
1385                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1386         }
1387
1388         return 0;
1389
1390 error_out:
1391         scsi_disk_put(sdkp);
1392         return retval;  
1393 }
1394
1395 /**
1396  *      sd_release - invoked when the (last) close(2) is called on this
1397  *      scsi disk.
1398  *      @disk: disk to release
1399  *      @mode: FMODE_* mask
1400  *
1401  *      Returns 0. 
1402  *
1403  *      Note: may block (uninterruptible) if error recovery is underway
1404  *      on this disk.
1405  *
1406  *      Locking: called with bdev->bd_mutex held.
1407  **/
1408 static void sd_release(struct gendisk *disk, fmode_t mode)
1409 {
1410         struct scsi_disk *sdkp = scsi_disk(disk);
1411         struct scsi_device *sdev = sdkp->device;
1412
1413         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1414
1415         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1416                 if (scsi_block_when_processing_errors(sdev))
1417                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1418         }
1419
1420         scsi_disk_put(sdkp);
1421 }
1422
1423 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1424 {
1425         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1426         struct scsi_device *sdp = sdkp->device;
1427         struct Scsi_Host *host = sdp->host;
1428         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1429         int diskinfo[4];
1430
1431         /* default to most commonly used values */
1432         diskinfo[0] = 0x40;     /* 1 << 6 */
1433         diskinfo[1] = 0x20;     /* 1 << 5 */
1434         diskinfo[2] = capacity >> 11;
1435
1436         /* override with calculated, extended default, or driver values */
1437         if (host->hostt->bios_param)
1438                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1439         else
1440                 scsicam_bios_param(bdev, capacity, diskinfo);
1441
1442         geo->heads = diskinfo[0];
1443         geo->sectors = diskinfo[1];
1444         geo->cylinders = diskinfo[2];
1445         return 0;
1446 }
1447
1448 /**
1449  *      sd_ioctl - process an ioctl
1450  *      @bdev: target block device
1451  *      @mode: FMODE_* mask
1452  *      @cmd: ioctl command number
1453  *      @arg: this is third argument given to ioctl(2) system call.
1454  *      Often contains a pointer.
1455  *
1456  *      Returns 0 if successful (some ioctls return positive numbers on
1457  *      success as well). Returns a negated errno value in case of error.
1458  *
1459  *      Note: most ioctls are forward onto the block subsystem or further
1460  *      down in the scsi subsystem.
1461  **/
1462 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1463                     unsigned int cmd, unsigned long arg)
1464 {
1465         struct gendisk *disk = bdev->bd_disk;
1466         struct scsi_disk *sdkp = scsi_disk(disk);
1467         struct scsi_device *sdp = sdkp->device;
1468         void __user *p = (void __user *)arg;
1469         int error;
1470     
1471         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1472                                     "cmd=0x%x\n", disk->disk_name, cmd));
1473
1474         error = scsi_verify_blk_ioctl(bdev, cmd);
1475         if (error < 0)
1476                 return error;
1477
1478         /*
1479          * If we are in the middle of error recovery, don't let anyone
1480          * else try and use this device.  Also, if error recovery fails, it
1481          * may try and take the device offline, in which case all further
1482          * access to the device is prohibited.
1483          */
1484         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1485                         (mode & FMODE_NDELAY) != 0);
1486         if (error)
1487                 goto out;
1488
1489         if (is_sed_ioctl(cmd))
1490                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1491
1492         /*
1493          * Send SCSI addressing ioctls directly to mid level, send other
1494          * ioctls to block level and then onto mid level if they can't be
1495          * resolved.
1496          */
1497         switch (cmd) {
1498                 case SCSI_IOCTL_GET_IDLUN:
1499                 case SCSI_IOCTL_GET_BUS_NUMBER:
1500                         error = scsi_ioctl(sdp, cmd, p);
1501                         break;
1502                 default:
1503                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1504                         if (error != -ENOTTY)
1505                                 break;
1506                         error = scsi_ioctl(sdp, cmd, p);
1507                         break;
1508         }
1509 out:
1510         return error;
1511 }
1512
1513 static void set_media_not_present(struct scsi_disk *sdkp)
1514 {
1515         if (sdkp->media_present)
1516                 sdkp->device->changed = 1;
1517
1518         if (sdkp->device->removable) {
1519                 sdkp->media_present = 0;
1520                 sdkp->capacity = 0;
1521         }
1522 }
1523
1524 static int media_not_present(struct scsi_disk *sdkp,
1525                              struct scsi_sense_hdr *sshdr)
1526 {
1527         if (!scsi_sense_valid(sshdr))
1528                 return 0;
1529
1530         /* not invoked for commands that could return deferred errors */
1531         switch (sshdr->sense_key) {
1532         case UNIT_ATTENTION:
1533         case NOT_READY:
1534                 /* medium not present */
1535                 if (sshdr->asc == 0x3A) {
1536                         set_media_not_present(sdkp);
1537                         return 1;
1538                 }
1539         }
1540         return 0;
1541 }
1542
1543 /**
1544  *      sd_check_events - check media events
1545  *      @disk: kernel device descriptor
1546  *      @clearing: disk events currently being cleared
1547  *
1548  *      Returns mask of DISK_EVENT_*.
1549  *
1550  *      Note: this function is invoked from the block subsystem.
1551  **/
1552 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1553 {
1554         struct scsi_disk *sdkp = scsi_disk_get(disk);
1555         struct scsi_device *sdp;
1556         int retval;
1557
1558         if (!sdkp)
1559                 return 0;
1560
1561         sdp = sdkp->device;
1562         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1563
1564         /*
1565          * If the device is offline, don't send any commands - just pretend as
1566          * if the command failed.  If the device ever comes back online, we
1567          * can deal with it then.  It is only because of unrecoverable errors
1568          * that we would ever take a device offline in the first place.
1569          */
1570         if (!scsi_device_online(sdp)) {
1571                 set_media_not_present(sdkp);
1572                 goto out;
1573         }
1574
1575         /*
1576          * Using TEST_UNIT_READY enables differentiation between drive with
1577          * no cartridge loaded - NOT READY, drive with changed cartridge -
1578          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1579          *
1580          * Drives that auto spin down. eg iomega jaz 1G, will be started
1581          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1582          * sd_revalidate() is called.
1583          */
1584         if (scsi_block_when_processing_errors(sdp)) {
1585                 struct scsi_sense_hdr sshdr = { 0, };
1586
1587                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1588                                               &sshdr);
1589
1590                 /* failed to execute TUR, assume media not present */
1591                 if (host_byte(retval)) {
1592                         set_media_not_present(sdkp);
1593                         goto out;
1594                 }
1595
1596                 if (media_not_present(sdkp, &sshdr))
1597                         goto out;
1598         }
1599
1600         /*
1601          * For removable scsi disk we have to recognise the presence
1602          * of a disk in the drive.
1603          */
1604         if (!sdkp->media_present)
1605                 sdp->changed = 1;
1606         sdkp->media_present = 1;
1607 out:
1608         /*
1609          * sdp->changed is set under the following conditions:
1610          *
1611          *      Medium present state has changed in either direction.
1612          *      Device has indicated UNIT_ATTENTION.
1613          */
1614         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1615         sdp->changed = 0;
1616         scsi_disk_put(sdkp);
1617         return retval;
1618 }
1619
1620 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1621 {
1622         int retries, res;
1623         struct scsi_device *sdp = sdkp->device;
1624         const int timeout = sdp->request_queue->rq_timeout
1625                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1626         struct scsi_sense_hdr my_sshdr;
1627
1628         if (!scsi_device_online(sdp))
1629                 return -ENODEV;
1630
1631         /* caller might not be interested in sense, but we need it */
1632         if (!sshdr)
1633                 sshdr = &my_sshdr;
1634
1635         for (retries = 3; retries > 0; --retries) {
1636                 unsigned char cmd[10] = { 0 };
1637
1638                 cmd[0] = SYNCHRONIZE_CACHE;
1639                 /*
1640                  * Leave the rest of the command zero to indicate
1641                  * flush everything.
1642                  */
1643                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1644                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1645                 if (res == 0)
1646                         break;
1647         }
1648
1649         if (res) {
1650                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1651
1652                 if (driver_byte(res) == DRIVER_SENSE)
1653                         sd_print_sense_hdr(sdkp, sshdr);
1654
1655                 /* we need to evaluate the error return  */
1656                 if (scsi_sense_valid(sshdr) &&
1657                         (sshdr->asc == 0x3a ||  /* medium not present */
1658                          sshdr->asc == 0x20 ||  /* invalid command */
1659                          (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))  /* drive is password locked */
1660                                 /* this is no error here */
1661                                 return 0;
1662
1663                 switch (host_byte(res)) {
1664                 /* ignore errors due to racing a disconnection */
1665                 case DID_BAD_TARGET:
1666                 case DID_NO_CONNECT:
1667                         return 0;
1668                 /* signal the upper layer it might try again */
1669                 case DID_BUS_BUSY:
1670                 case DID_IMM_RETRY:
1671                 case DID_REQUEUE:
1672                 case DID_SOFT_ERROR:
1673                         return -EBUSY;
1674                 default:
1675                         return -EIO;
1676                 }
1677         }
1678         return 0;
1679 }
1680
1681 static void sd_rescan(struct device *dev)
1682 {
1683         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1684
1685         revalidate_disk(sdkp->disk);
1686 }
1687
1688
1689 #ifdef CONFIG_COMPAT
1690 /* 
1691  * This gets directly called from VFS. When the ioctl 
1692  * is not recognized we go back to the other translation paths. 
1693  */
1694 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1695                            unsigned int cmd, unsigned long arg)
1696 {
1697         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1698         int error;
1699
1700         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1701                         (mode & FMODE_NDELAY) != 0);
1702         if (error)
1703                 return error;
1704                
1705         /* 
1706          * Let the static ioctl translation table take care of it.
1707          */
1708         if (!sdev->host->hostt->compat_ioctl)
1709                 return -ENOIOCTLCMD; 
1710         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1711 }
1712 #endif
1713
1714 static char sd_pr_type(enum pr_type type)
1715 {
1716         switch (type) {
1717         case PR_WRITE_EXCLUSIVE:
1718                 return 0x01;
1719         case PR_EXCLUSIVE_ACCESS:
1720                 return 0x03;
1721         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1722                 return 0x05;
1723         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1724                 return 0x06;
1725         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1726                 return 0x07;
1727         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1728                 return 0x08;
1729         default:
1730                 return 0;
1731         }
1732 };
1733
1734 static int sd_pr_command(struct block_device *bdev, u8 sa,
1735                 u64 key, u64 sa_key, u8 type, u8 flags)
1736 {
1737         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1738         struct scsi_sense_hdr sshdr;
1739         int result;
1740         u8 cmd[16] = { 0, };
1741         u8 data[24] = { 0, };
1742
1743         cmd[0] = PERSISTENT_RESERVE_OUT;
1744         cmd[1] = sa;
1745         cmd[2] = type;
1746         put_unaligned_be32(sizeof(data), &cmd[5]);
1747
1748         put_unaligned_be64(key, &data[0]);
1749         put_unaligned_be64(sa_key, &data[8]);
1750         data[20] = flags;
1751
1752         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1753                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1754
1755         if (driver_byte(result) == DRIVER_SENSE &&
1756             scsi_sense_valid(&sshdr)) {
1757                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1758                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1759         }
1760
1761         return result;
1762 }
1763
1764 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1765                 u32 flags)
1766 {
1767         if (flags & ~PR_FL_IGNORE_KEY)
1768                 return -EOPNOTSUPP;
1769         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1770                         old_key, new_key, 0,
1771                         (1 << 0) /* APTPL */);
1772 }
1773
1774 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1775                 u32 flags)
1776 {
1777         if (flags)
1778                 return -EOPNOTSUPP;
1779         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1780 }
1781
1782 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1783 {
1784         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1785 }
1786
1787 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1788                 enum pr_type type, bool abort)
1789 {
1790         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1791                              sd_pr_type(type), 0);
1792 }
1793
1794 static int sd_pr_clear(struct block_device *bdev, u64 key)
1795 {
1796         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1797 }
1798
1799 static const struct pr_ops sd_pr_ops = {
1800         .pr_register    = sd_pr_register,
1801         .pr_reserve     = sd_pr_reserve,
1802         .pr_release     = sd_pr_release,
1803         .pr_preempt     = sd_pr_preempt,
1804         .pr_clear       = sd_pr_clear,
1805 };
1806
1807 static const struct block_device_operations sd_fops = {
1808         .owner                  = THIS_MODULE,
1809         .open                   = sd_open,
1810         .release                = sd_release,
1811         .ioctl                  = sd_ioctl,
1812         .getgeo                 = sd_getgeo,
1813 #ifdef CONFIG_COMPAT
1814         .compat_ioctl           = sd_compat_ioctl,
1815 #endif
1816         .check_events           = sd_check_events,
1817         .revalidate_disk        = sd_revalidate_disk,
1818         .unlock_native_capacity = sd_unlock_native_capacity,
1819         .report_zones           = sd_zbc_report_zones,
1820         .pr_ops                 = &sd_pr_ops,
1821 };
1822
1823 /**
1824  *      sd_eh_reset - reset error handling callback
1825  *      @scmd:          sd-issued command that has failed
1826  *
1827  *      This function is called by the SCSI midlayer before starting
1828  *      SCSI EH. When counting medium access failures we have to be
1829  *      careful to register it only only once per device and SCSI EH run;
1830  *      there might be several timed out commands which will cause the
1831  *      'max_medium_access_timeouts' counter to trigger after the first
1832  *      SCSI EH run already and set the device to offline.
1833  *      So this function resets the internal counter before starting SCSI EH.
1834  **/
1835 static void sd_eh_reset(struct scsi_cmnd *scmd)
1836 {
1837         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1838
1839         /* New SCSI EH run, reset gate variable */
1840         sdkp->ignore_medium_access_errors = false;
1841 }
1842
1843 /**
1844  *      sd_eh_action - error handling callback
1845  *      @scmd:          sd-issued command that has failed
1846  *      @eh_disp:       The recovery disposition suggested by the midlayer
1847  *
1848  *      This function is called by the SCSI midlayer upon completion of an
1849  *      error test command (currently TEST UNIT READY). The result of sending
1850  *      the eh command is passed in eh_disp.  We're looking for devices that
1851  *      fail medium access commands but are OK with non access commands like
1852  *      test unit ready (so wrongly see the device as having a successful
1853  *      recovery)
1854  **/
1855 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1856 {
1857         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1858         struct scsi_device *sdev = scmd->device;
1859
1860         if (!scsi_device_online(sdev) ||
1861             !scsi_medium_access_command(scmd) ||
1862             host_byte(scmd->result) != DID_TIME_OUT ||
1863             eh_disp != SUCCESS)
1864                 return eh_disp;
1865
1866         /*
1867          * The device has timed out executing a medium access command.
1868          * However, the TEST UNIT READY command sent during error
1869          * handling completed successfully. Either the device is in the
1870          * process of recovering or has it suffered an internal failure
1871          * that prevents access to the storage medium.
1872          */
1873         if (!sdkp->ignore_medium_access_errors) {
1874                 sdkp->medium_access_timed_out++;
1875                 sdkp->ignore_medium_access_errors = true;
1876         }
1877
1878         /*
1879          * If the device keeps failing read/write commands but TEST UNIT
1880          * READY always completes successfully we assume that medium
1881          * access is no longer possible and take the device offline.
1882          */
1883         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1884                 scmd_printk(KERN_ERR, scmd,
1885                             "Medium access timeout failure. Offlining disk!\n");
1886                 mutex_lock(&sdev->state_mutex);
1887                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1888                 mutex_unlock(&sdev->state_mutex);
1889
1890                 return SUCCESS;
1891         }
1892
1893         return eh_disp;
1894 }
1895
1896 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1897 {
1898         struct request *req = scmd->request;
1899         struct scsi_device *sdev = scmd->device;
1900         unsigned int transferred, good_bytes;
1901         u64 start_lba, end_lba, bad_lba;
1902
1903         /*
1904          * Some commands have a payload smaller than the device logical
1905          * block size (e.g. INQUIRY on a 4K disk).
1906          */
1907         if (scsi_bufflen(scmd) <= sdev->sector_size)
1908                 return 0;
1909
1910         /* Check if we have a 'bad_lba' information */
1911         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1912                                      SCSI_SENSE_BUFFERSIZE,
1913                                      &bad_lba))
1914                 return 0;
1915
1916         /*
1917          * If the bad lba was reported incorrectly, we have no idea where
1918          * the error is.
1919          */
1920         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1921         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1922         if (bad_lba < start_lba || bad_lba >= end_lba)
1923                 return 0;
1924
1925         /*
1926          * resid is optional but mostly filled in.  When it's unused,
1927          * its value is zero, so we assume the whole buffer transferred
1928          */
1929         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1930
1931         /* This computation should always be done in terms of the
1932          * resolution of the device's medium.
1933          */
1934         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1935
1936         return min(good_bytes, transferred);
1937 }
1938
1939 /**
1940  *      sd_done - bottom half handler: called when the lower level
1941  *      driver has completed (successfully or otherwise) a scsi command.
1942  *      @SCpnt: mid-level's per command structure.
1943  *
1944  *      Note: potentially run from within an ISR. Must not block.
1945  **/
1946 static int sd_done(struct scsi_cmnd *SCpnt)
1947 {
1948         int result = SCpnt->result;
1949         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1950         unsigned int sector_size = SCpnt->device->sector_size;
1951         unsigned int resid;
1952         struct scsi_sense_hdr sshdr;
1953         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1954         struct request *req = SCpnt->request;
1955         int sense_valid = 0;
1956         int sense_deferred = 0;
1957
1958         switch (req_op(req)) {
1959         case REQ_OP_DISCARD:
1960         case REQ_OP_WRITE_ZEROES:
1961         case REQ_OP_WRITE_SAME:
1962         case REQ_OP_ZONE_RESET:
1963                 if (!result) {
1964                         good_bytes = blk_rq_bytes(req);
1965                         scsi_set_resid(SCpnt, 0);
1966                 } else {
1967                         good_bytes = 0;
1968                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1969                 }
1970                 break;
1971         default:
1972                 /*
1973                  * In case of bogus fw or device, we could end up having
1974                  * an unaligned partial completion. Check this here and force
1975                  * alignment.
1976                  */
1977                 resid = scsi_get_resid(SCpnt);
1978                 if (resid & (sector_size - 1)) {
1979                         sd_printk(KERN_INFO, sdkp,
1980                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1981                                 resid, sector_size);
1982                         scsi_print_command(SCpnt);
1983                         resid = min(scsi_bufflen(SCpnt),
1984                                     round_up(resid, sector_size));
1985                         scsi_set_resid(SCpnt, resid);
1986                 }
1987         }
1988
1989         if (result) {
1990                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1991                 if (sense_valid)
1992                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1993         }
1994         sdkp->medium_access_timed_out = 0;
1995
1996         if (driver_byte(result) != DRIVER_SENSE &&
1997             (!sense_valid || sense_deferred))
1998                 goto out;
1999
2000         switch (sshdr.sense_key) {
2001         case HARDWARE_ERROR:
2002         case MEDIUM_ERROR:
2003                 good_bytes = sd_completed_bytes(SCpnt);
2004                 break;
2005         case RECOVERED_ERROR:
2006                 good_bytes = scsi_bufflen(SCpnt);
2007                 break;
2008         case NO_SENSE:
2009                 /* This indicates a false check condition, so ignore it.  An
2010                  * unknown amount of data was transferred so treat it as an
2011                  * error.
2012                  */
2013                 SCpnt->result = 0;
2014                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2015                 break;
2016         case ABORTED_COMMAND:
2017                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2018                         good_bytes = sd_completed_bytes(SCpnt);
2019                 break;
2020         case ILLEGAL_REQUEST:
2021                 switch (sshdr.asc) {
2022                 case 0x10:      /* DIX: Host detected corruption */
2023                         good_bytes = sd_completed_bytes(SCpnt);
2024                         break;
2025                 case 0x20:      /* INVALID COMMAND OPCODE */
2026                 case 0x24:      /* INVALID FIELD IN CDB */
2027                         switch (SCpnt->cmnd[0]) {
2028                         case UNMAP:
2029                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2030                                 break;
2031                         case WRITE_SAME_16:
2032                         case WRITE_SAME:
2033                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2034                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2035                                 } else {
2036                                         sdkp->device->no_write_same = 1;
2037                                         sd_config_write_same(sdkp);
2038                                         req->rq_flags |= RQF_QUIET;
2039                                 }
2040                                 break;
2041                         }
2042                 }
2043                 break;
2044         default:
2045                 break;
2046         }
2047
2048  out:
2049         if (sd_is_zoned(sdkp))
2050                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2051
2052         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2053                                            "sd_done: completed %d of %d bytes\n",
2054                                            good_bytes, scsi_bufflen(SCpnt)));
2055
2056         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2057             good_bytes)
2058                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2059                                 good_bytes / scsi_prot_interval(SCpnt));
2060
2061         return good_bytes;
2062 }
2063
2064 /*
2065  * spinup disk - called only in sd_revalidate_disk()
2066  */
2067 static void
2068 sd_spinup_disk(struct scsi_disk *sdkp)
2069 {
2070         unsigned char cmd[10];
2071         unsigned long spintime_expire = 0;
2072         int retries, spintime;
2073         unsigned int the_result;
2074         struct scsi_sense_hdr sshdr;
2075         int sense_valid = 0;
2076
2077         spintime = 0;
2078
2079         /* Spin up drives, as required.  Only do this at boot time */
2080         /* Spinup needs to be done for module loads too. */
2081         do {
2082                 retries = 0;
2083
2084                 do {
2085                         cmd[0] = TEST_UNIT_READY;
2086                         memset((void *) &cmd[1], 0, 9);
2087
2088                         the_result = scsi_execute_req(sdkp->device, cmd,
2089                                                       DMA_NONE, NULL, 0,
2090                                                       &sshdr, SD_TIMEOUT,
2091                                                       SD_MAX_RETRIES, NULL);
2092
2093                         /*
2094                          * If the drive has indicated to us that it
2095                          * doesn't have any media in it, don't bother
2096                          * with any more polling.
2097                          */
2098                         if (media_not_present(sdkp, &sshdr))
2099                                 return;
2100
2101                         if (the_result)
2102                                 sense_valid = scsi_sense_valid(&sshdr);
2103                         retries++;
2104                 } while (retries < 3 && 
2105                          (!scsi_status_is_good(the_result) ||
2106                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2107                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2108
2109                 if (driver_byte(the_result) != DRIVER_SENSE) {
2110                         /* no sense, TUR either succeeded or failed
2111                          * with a status error */
2112                         if(!spintime && !scsi_status_is_good(the_result)) {
2113                                 sd_print_result(sdkp, "Test Unit Ready failed",
2114                                                 the_result);
2115                         }
2116                         break;
2117                 }
2118
2119                 /*
2120                  * The device does not want the automatic start to be issued.
2121                  */
2122                 if (sdkp->device->no_start_on_add)
2123                         break;
2124
2125                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2126                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2127                                 break;  /* manual intervention required */
2128                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2129                                 break;  /* standby */
2130                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2131                                 break;  /* unavailable */
2132                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2133                                 break;  /* sanitize in progress */
2134                         /*
2135                          * Issue command to spin up drive when not ready
2136                          */
2137                         if (!spintime) {
2138                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2139                                 cmd[0] = START_STOP;
2140                                 cmd[1] = 1;     /* Return immediately */
2141                                 memset((void *) &cmd[2], 0, 8);
2142                                 cmd[4] = 1;     /* Start spin cycle */
2143                                 if (sdkp->device->start_stop_pwr_cond)
2144                                         cmd[4] |= 1 << 4;
2145                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2146                                                  NULL, 0, &sshdr,
2147                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2148                                                  NULL);
2149                                 spintime_expire = jiffies + 100 * HZ;
2150                                 spintime = 1;
2151                         }
2152                         /* Wait 1 second for next try */
2153                         msleep(1000);
2154                         printk(KERN_CONT ".");
2155
2156                 /*
2157                  * Wait for USB flash devices with slow firmware.
2158                  * Yes, this sense key/ASC combination shouldn't
2159                  * occur here.  It's characteristic of these devices.
2160                  */
2161                 } else if (sense_valid &&
2162                                 sshdr.sense_key == UNIT_ATTENTION &&
2163                                 sshdr.asc == 0x28) {
2164                         if (!spintime) {
2165                                 spintime_expire = jiffies + 5 * HZ;
2166                                 spintime = 1;
2167                         }
2168                         /* Wait 1 second for next try */
2169                         msleep(1000);
2170                 } else {
2171                         /* we don't understand the sense code, so it's
2172                          * probably pointless to loop */
2173                         if(!spintime) {
2174                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2175                                 sd_print_sense_hdr(sdkp, &sshdr);
2176                         }
2177                         break;
2178                 }
2179                                 
2180         } while (spintime && time_before_eq(jiffies, spintime_expire));
2181
2182         if (spintime) {
2183                 if (scsi_status_is_good(the_result))
2184                         printk(KERN_CONT "ready\n");
2185                 else
2186                         printk(KERN_CONT "not responding...\n");
2187         }
2188 }
2189
2190 /*
2191  * Determine whether disk supports Data Integrity Field.
2192  */
2193 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2194 {
2195         struct scsi_device *sdp = sdkp->device;
2196         u8 type;
2197         int ret = 0;
2198
2199         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2200                 return ret;
2201
2202         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2203
2204         if (type > T10_PI_TYPE3_PROTECTION)
2205                 ret = -ENODEV;
2206         else if (scsi_host_dif_capable(sdp->host, type))
2207                 ret = 1;
2208
2209         if (sdkp->first_scan || type != sdkp->protection_type)
2210                 switch (ret) {
2211                 case -ENODEV:
2212                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2213                                   " protection type %u. Disabling disk!\n",
2214                                   type);
2215                         break;
2216                 case 1:
2217                         sd_printk(KERN_NOTICE, sdkp,
2218                                   "Enabling DIF Type %u protection\n", type);
2219                         break;
2220                 case 0:
2221                         sd_printk(KERN_NOTICE, sdkp,
2222                                   "Disabling DIF Type %u protection\n", type);
2223                         break;
2224                 }
2225
2226         sdkp->protection_type = type;
2227
2228         return ret;
2229 }
2230
2231 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2232                         struct scsi_sense_hdr *sshdr, int sense_valid,
2233                         int the_result)
2234 {
2235         if (driver_byte(the_result) == DRIVER_SENSE)
2236                 sd_print_sense_hdr(sdkp, sshdr);
2237         else
2238                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2239
2240         /*
2241          * Set dirty bit for removable devices if not ready -
2242          * sometimes drives will not report this properly.
2243          */
2244         if (sdp->removable &&
2245             sense_valid && sshdr->sense_key == NOT_READY)
2246                 set_media_not_present(sdkp);
2247
2248         /*
2249          * We used to set media_present to 0 here to indicate no media
2250          * in the drive, but some drives fail read capacity even with
2251          * media present, so we can't do that.
2252          */
2253         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2254 }
2255
2256 #define RC16_LEN 32
2257 #if RC16_LEN > SD_BUF_SIZE
2258 #error RC16_LEN must not be more than SD_BUF_SIZE
2259 #endif
2260
2261 #define READ_CAPACITY_RETRIES_ON_RESET  10
2262
2263 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2264                                                 unsigned char *buffer)
2265 {
2266         unsigned char cmd[16];
2267         struct scsi_sense_hdr sshdr;
2268         int sense_valid = 0;
2269         int the_result;
2270         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2271         unsigned int alignment;
2272         unsigned long long lba;
2273         unsigned sector_size;
2274
2275         if (sdp->no_read_capacity_16)
2276                 return -EINVAL;
2277
2278         do {
2279                 memset(cmd, 0, 16);
2280                 cmd[0] = SERVICE_ACTION_IN_16;
2281                 cmd[1] = SAI_READ_CAPACITY_16;
2282                 cmd[13] = RC16_LEN;
2283                 memset(buffer, 0, RC16_LEN);
2284
2285                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2286                                         buffer, RC16_LEN, &sshdr,
2287                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2288
2289                 if (media_not_present(sdkp, &sshdr))
2290                         return -ENODEV;
2291
2292                 if (the_result) {
2293                         sense_valid = scsi_sense_valid(&sshdr);
2294                         if (sense_valid &&
2295                             sshdr.sense_key == ILLEGAL_REQUEST &&
2296                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2297                             sshdr.ascq == 0x00)
2298                                 /* Invalid Command Operation Code or
2299                                  * Invalid Field in CDB, just retry
2300                                  * silently with RC10 */
2301                                 return -EINVAL;
2302                         if (sense_valid &&
2303                             sshdr.sense_key == UNIT_ATTENTION &&
2304                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2305                                 /* Device reset might occur several times,
2306                                  * give it one more chance */
2307                                 if (--reset_retries > 0)
2308                                         continue;
2309                 }
2310                 retries--;
2311
2312         } while (the_result && retries);
2313
2314         if (the_result) {
2315                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2316                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2317                 return -EINVAL;
2318         }
2319
2320         sector_size = get_unaligned_be32(&buffer[8]);
2321         lba = get_unaligned_be64(&buffer[0]);
2322
2323         if (sd_read_protection_type(sdkp, buffer) < 0) {
2324                 sdkp->capacity = 0;
2325                 return -ENODEV;
2326         }
2327
2328         /* Logical blocks per physical block exponent */
2329         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2330
2331         /* RC basis */
2332         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2333
2334         /* Lowest aligned logical block */
2335         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2336         blk_queue_alignment_offset(sdp->request_queue, alignment);
2337         if (alignment && sdkp->first_scan)
2338                 sd_printk(KERN_NOTICE, sdkp,
2339                           "physical block alignment offset: %u\n", alignment);
2340
2341         if (buffer[14] & 0x80) { /* LBPME */
2342                 sdkp->lbpme = 1;
2343
2344                 if (buffer[14] & 0x40) /* LBPRZ */
2345                         sdkp->lbprz = 1;
2346
2347                 sd_config_discard(sdkp, SD_LBP_WS16);
2348         }
2349
2350         sdkp->capacity = lba + 1;
2351         return sector_size;
2352 }
2353
2354 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2355                                                 unsigned char *buffer)
2356 {
2357         unsigned char cmd[16];
2358         struct scsi_sense_hdr sshdr;
2359         int sense_valid = 0;
2360         int the_result;
2361         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2362         sector_t lba;
2363         unsigned sector_size;
2364
2365         do {
2366                 cmd[0] = READ_CAPACITY;
2367                 memset(&cmd[1], 0, 9);
2368                 memset(buffer, 0, 8);
2369
2370                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2371                                         buffer, 8, &sshdr,
2372                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2373
2374                 if (media_not_present(sdkp, &sshdr))
2375                         return -ENODEV;
2376
2377                 if (the_result) {
2378                         sense_valid = scsi_sense_valid(&sshdr);
2379                         if (sense_valid &&
2380                             sshdr.sense_key == UNIT_ATTENTION &&
2381                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2382                                 /* Device reset might occur several times,
2383                                  * give it one more chance */
2384                                 if (--reset_retries > 0)
2385                                         continue;
2386                 }
2387                 retries--;
2388
2389         } while (the_result && retries);
2390
2391         if (the_result) {
2392                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2393                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2394                 return -EINVAL;
2395         }
2396
2397         sector_size = get_unaligned_be32(&buffer[4]);
2398         lba = get_unaligned_be32(&buffer[0]);
2399
2400         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2401                 /* Some buggy (usb cardreader) devices return an lba of
2402                    0xffffffff when the want to report a size of 0 (with
2403                    which they really mean no media is present) */
2404                 sdkp->capacity = 0;
2405                 sdkp->physical_block_size = sector_size;
2406                 return sector_size;
2407         }
2408
2409         sdkp->capacity = lba + 1;
2410         sdkp->physical_block_size = sector_size;
2411         return sector_size;
2412 }
2413
2414 static int sd_try_rc16_first(struct scsi_device *sdp)
2415 {
2416         if (sdp->host->max_cmd_len < 16)
2417                 return 0;
2418         if (sdp->try_rc_10_first)
2419                 return 0;
2420         if (sdp->scsi_level > SCSI_SPC_2)
2421                 return 1;
2422         if (scsi_device_protection(sdp))
2423                 return 1;
2424         return 0;
2425 }
2426
2427 /*
2428  * read disk capacity
2429  */
2430 static void
2431 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2432 {
2433         int sector_size;
2434         struct scsi_device *sdp = sdkp->device;
2435
2436         if (sd_try_rc16_first(sdp)) {
2437                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2438                 if (sector_size == -EOVERFLOW)
2439                         goto got_data;
2440                 if (sector_size == -ENODEV)
2441                         return;
2442                 if (sector_size < 0)
2443                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2444                 if (sector_size < 0)
2445                         return;
2446         } else {
2447                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2448                 if (sector_size == -EOVERFLOW)
2449                         goto got_data;
2450                 if (sector_size < 0)
2451                         return;
2452                 if ((sizeof(sdkp->capacity) > 4) &&
2453                     (sdkp->capacity > 0xffffffffULL)) {
2454                         int old_sector_size = sector_size;
2455                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2456                                         "Trying to use READ CAPACITY(16).\n");
2457                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2458                         if (sector_size < 0) {
2459                                 sd_printk(KERN_NOTICE, sdkp,
2460                                         "Using 0xffffffff as device size\n");
2461                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2462                                 sector_size = old_sector_size;
2463                                 goto got_data;
2464                         }
2465                         /* Remember that READ CAPACITY(16) succeeded */
2466                         sdp->try_rc_10_first = 0;
2467                 }
2468         }
2469
2470         /* Some devices are known to return the total number of blocks,
2471          * not the highest block number.  Some devices have versions
2472          * which do this and others which do not.  Some devices we might
2473          * suspect of doing this but we don't know for certain.
2474          *
2475          * If we know the reported capacity is wrong, decrement it.  If
2476          * we can only guess, then assume the number of blocks is even
2477          * (usually true but not always) and err on the side of lowering
2478          * the capacity.
2479          */
2480         if (sdp->fix_capacity ||
2481             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2482                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2483                                 "from its reported value: %llu\n",
2484                                 (unsigned long long) sdkp->capacity);
2485                 --sdkp->capacity;
2486         }
2487
2488 got_data:
2489         if (sector_size == 0) {
2490                 sector_size = 512;
2491                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2492                           "assuming 512.\n");
2493         }
2494
2495         if (sector_size != 512 &&
2496             sector_size != 1024 &&
2497             sector_size != 2048 &&
2498             sector_size != 4096) {
2499                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2500                           sector_size);
2501                 /*
2502                  * The user might want to re-format the drive with
2503                  * a supported sectorsize.  Once this happens, it
2504                  * would be relatively trivial to set the thing up.
2505                  * For this reason, we leave the thing in the table.
2506                  */
2507                 sdkp->capacity = 0;
2508                 /*
2509                  * set a bogus sector size so the normal read/write
2510                  * logic in the block layer will eventually refuse any
2511                  * request on this device without tripping over power
2512                  * of two sector size assumptions
2513                  */
2514                 sector_size = 512;
2515         }
2516         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2517         blk_queue_physical_block_size(sdp->request_queue,
2518                                       sdkp->physical_block_size);
2519         sdkp->device->sector_size = sector_size;
2520
2521         if (sdkp->capacity > 0xffffffff)
2522                 sdp->use_16_for_rw = 1;
2523
2524 }
2525
2526 /*
2527  * Print disk capacity
2528  */
2529 static void
2530 sd_print_capacity(struct scsi_disk *sdkp,
2531                   sector_t old_capacity)
2532 {
2533         int sector_size = sdkp->device->sector_size;
2534         char cap_str_2[10], cap_str_10[10];
2535
2536         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2537                 return;
2538
2539         string_get_size(sdkp->capacity, sector_size,
2540                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2541         string_get_size(sdkp->capacity, sector_size,
2542                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2543
2544         sd_printk(KERN_NOTICE, sdkp,
2545                   "%llu %d-byte logical blocks: (%s/%s)\n",
2546                   (unsigned long long)sdkp->capacity,
2547                   sector_size, cap_str_10, cap_str_2);
2548
2549         if (sdkp->physical_block_size != sector_size)
2550                 sd_printk(KERN_NOTICE, sdkp,
2551                           "%u-byte physical blocks\n",
2552                           sdkp->physical_block_size);
2553
2554         sd_zbc_print_zones(sdkp);
2555 }
2556
2557 /* called with buffer of length 512 */
2558 static inline int
2559 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2560                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2561                  struct scsi_sense_hdr *sshdr)
2562 {
2563         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2564                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2565                                sshdr);
2566 }
2567
2568 /*
2569  * read write protect setting, if possible - called only in sd_revalidate_disk()
2570  * called with buffer of length SD_BUF_SIZE
2571  */
2572 static void
2573 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2574 {
2575         int res;
2576         struct scsi_device *sdp = sdkp->device;
2577         struct scsi_mode_data data;
2578         int old_wp = sdkp->write_prot;
2579
2580         set_disk_ro(sdkp->disk, 0);
2581         if (sdp->skip_ms_page_3f) {
2582                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2583                 return;
2584         }
2585
2586         if (sdp->use_192_bytes_for_3f) {
2587                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2588         } else {
2589                 /*
2590                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2591                  * We have to start carefully: some devices hang if we ask
2592                  * for more than is available.
2593                  */
2594                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2595
2596                 /*
2597                  * Second attempt: ask for page 0 When only page 0 is
2598                  * implemented, a request for page 3F may return Sense Key
2599                  * 5: Illegal Request, Sense Code 24: Invalid field in
2600                  * CDB.
2601                  */
2602                 if (!scsi_status_is_good(res))
2603                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2604
2605                 /*
2606                  * Third attempt: ask 255 bytes, as we did earlier.
2607                  */
2608                 if (!scsi_status_is_good(res))
2609                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2610                                                &data, NULL);
2611         }
2612
2613         if (!scsi_status_is_good(res)) {
2614                 sd_first_printk(KERN_WARNING, sdkp,
2615                           "Test WP failed, assume Write Enabled\n");
2616         } else {
2617                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2618                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2619                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2620                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2621                                   sdkp->write_prot ? "on" : "off");
2622                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2623                 }
2624         }
2625 }
2626
2627 /*
2628  * sd_read_cache_type - called only from sd_revalidate_disk()
2629  * called with buffer of length SD_BUF_SIZE
2630  */
2631 static void
2632 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2633 {
2634         int len = 0, res;
2635         struct scsi_device *sdp = sdkp->device;
2636
2637         int dbd;
2638         int modepage;
2639         int first_len;
2640         struct scsi_mode_data data;
2641         struct scsi_sense_hdr sshdr;
2642         int old_wce = sdkp->WCE;
2643         int old_rcd = sdkp->RCD;
2644         int old_dpofua = sdkp->DPOFUA;
2645
2646
2647         if (sdkp->cache_override)
2648                 return;
2649
2650         first_len = 4;
2651         if (sdp->skip_ms_page_8) {
2652                 if (sdp->type == TYPE_RBC)
2653                         goto defaults;
2654                 else {
2655                         if (sdp->skip_ms_page_3f)
2656                                 goto defaults;
2657                         modepage = 0x3F;
2658                         if (sdp->use_192_bytes_for_3f)
2659                                 first_len = 192;
2660                         dbd = 0;
2661                 }
2662         } else if (sdp->type == TYPE_RBC) {
2663                 modepage = 6;
2664                 dbd = 8;
2665         } else {
2666                 modepage = 8;
2667                 dbd = 0;
2668         }
2669
2670         /* cautiously ask */
2671         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2672                         &data, &sshdr);
2673
2674         if (!scsi_status_is_good(res))
2675                 goto bad_sense;
2676
2677         if (!data.header_length) {
2678                 modepage = 6;
2679                 first_len = 0;
2680                 sd_first_printk(KERN_ERR, sdkp,
2681                                 "Missing header in MODE_SENSE response\n");
2682         }
2683
2684         /* that went OK, now ask for the proper length */
2685         len = data.length;
2686
2687         /*
2688          * We're only interested in the first three bytes, actually.
2689          * But the data cache page is defined for the first 20.
2690          */
2691         if (len < 3)
2692                 goto bad_sense;
2693         else if (len > SD_BUF_SIZE) {
2694                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2695                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2696                 len = SD_BUF_SIZE;
2697         }
2698         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2699                 len = 192;
2700
2701         /* Get the data */
2702         if (len > first_len)
2703                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2704                                 &data, &sshdr);
2705
2706         if (scsi_status_is_good(res)) {
2707                 int offset = data.header_length + data.block_descriptor_length;
2708
2709                 while (offset < len) {
2710                         u8 page_code = buffer[offset] & 0x3F;
2711                         u8 spf       = buffer[offset] & 0x40;
2712
2713                         if (page_code == 8 || page_code == 6) {
2714                                 /* We're interested only in the first 3 bytes.
2715                                  */
2716                                 if (len - offset <= 2) {
2717                                         sd_first_printk(KERN_ERR, sdkp,
2718                                                 "Incomplete mode parameter "
2719                                                         "data\n");
2720                                         goto defaults;
2721                                 } else {
2722                                         modepage = page_code;
2723                                         goto Page_found;
2724                                 }
2725                         } else {
2726                                 /* Go to the next page */
2727                                 if (spf && len - offset > 3)
2728                                         offset += 4 + (buffer[offset+2] << 8) +
2729                                                 buffer[offset+3];
2730                                 else if (!spf && len - offset > 1)
2731                                         offset += 2 + buffer[offset+1];
2732                                 else {
2733                                         sd_first_printk(KERN_ERR, sdkp,
2734                                                         "Incomplete mode "
2735                                                         "parameter data\n");
2736                                         goto defaults;
2737                                 }
2738                         }
2739                 }
2740
2741                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2742                 goto defaults;
2743
2744         Page_found:
2745                 if (modepage == 8) {
2746                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2747                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2748                 } else {
2749                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2750                         sdkp->RCD = 0;
2751                 }
2752
2753                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2754                 if (sdp->broken_fua) {
2755                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2756                         sdkp->DPOFUA = 0;
2757                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2758                            !sdkp->device->use_16_for_rw) {
2759                         sd_first_printk(KERN_NOTICE, sdkp,
2760                                   "Uses READ/WRITE(6), disabling FUA\n");
2761                         sdkp->DPOFUA = 0;
2762                 }
2763
2764                 /* No cache flush allowed for write protected devices */
2765                 if (sdkp->WCE && sdkp->write_prot)
2766                         sdkp->WCE = 0;
2767
2768                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2769                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2770                         sd_printk(KERN_NOTICE, sdkp,
2771                                   "Write cache: %s, read cache: %s, %s\n",
2772                                   sdkp->WCE ? "enabled" : "disabled",
2773                                   sdkp->RCD ? "disabled" : "enabled",
2774                                   sdkp->DPOFUA ? "supports DPO and FUA"
2775                                   : "doesn't support DPO or FUA");
2776
2777                 return;
2778         }
2779
2780 bad_sense:
2781         if (scsi_sense_valid(&sshdr) &&
2782             sshdr.sense_key == ILLEGAL_REQUEST &&
2783             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2784                 /* Invalid field in CDB */
2785                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2786         else
2787                 sd_first_printk(KERN_ERR, sdkp,
2788                                 "Asking for cache data failed\n");
2789
2790 defaults:
2791         if (sdp->wce_default_on) {
2792                 sd_first_printk(KERN_NOTICE, sdkp,
2793                                 "Assuming drive cache: write back\n");
2794                 sdkp->WCE = 1;
2795         } else {
2796                 sd_first_printk(KERN_ERR, sdkp,
2797                                 "Assuming drive cache: write through\n");
2798                 sdkp->WCE = 0;
2799         }
2800         sdkp->RCD = 0;
2801         sdkp->DPOFUA = 0;
2802 }
2803
2804 /*
2805  * The ATO bit indicates whether the DIF application tag is available
2806  * for use by the operating system.
2807  */
2808 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2809 {
2810         int res, offset;
2811         struct scsi_device *sdp = sdkp->device;
2812         struct scsi_mode_data data;
2813         struct scsi_sense_hdr sshdr;
2814
2815         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2816                 return;
2817
2818         if (sdkp->protection_type == 0)
2819                 return;
2820
2821         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2822                               SD_MAX_RETRIES, &data, &sshdr);
2823
2824         if (!scsi_status_is_good(res) || !data.header_length ||
2825             data.length < 6) {
2826                 sd_first_printk(KERN_WARNING, sdkp,
2827                           "getting Control mode page failed, assume no ATO\n");
2828
2829                 if (scsi_sense_valid(&sshdr))
2830                         sd_print_sense_hdr(sdkp, &sshdr);
2831
2832                 return;
2833         }
2834
2835         offset = data.header_length + data.block_descriptor_length;
2836
2837         if ((buffer[offset] & 0x3f) != 0x0a) {
2838                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2839                 return;
2840         }
2841
2842         if ((buffer[offset + 5] & 0x80) == 0)
2843                 return;
2844
2845         sdkp->ATO = 1;
2846
2847         return;
2848 }
2849
2850 /**
2851  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2852  * @sdkp: disk to query
2853  */
2854 static void sd_read_block_limits(struct scsi_disk *sdkp)
2855 {
2856         unsigned int sector_sz = sdkp->device->sector_size;
2857         const int vpd_len = 64;
2858         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2859
2860         if (!buffer ||
2861             /* Block Limits VPD */
2862             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2863                 goto out;
2864
2865         blk_queue_io_min(sdkp->disk->queue,
2866                          get_unaligned_be16(&buffer[6]) * sector_sz);
2867
2868         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2869         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2870
2871         if (buffer[3] == 0x3c) {
2872                 unsigned int lba_count, desc_count;
2873
2874                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2875
2876                 if (!sdkp->lbpme)
2877                         goto out;
2878
2879                 lba_count = get_unaligned_be32(&buffer[20]);
2880                 desc_count = get_unaligned_be32(&buffer[24]);
2881
2882                 if (lba_count && desc_count)
2883                         sdkp->max_unmap_blocks = lba_count;
2884
2885                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2886
2887                 if (buffer[32] & 0x80)
2888                         sdkp->unmap_alignment =
2889                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2890
2891                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2892
2893                         if (sdkp->max_unmap_blocks)
2894                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2895                         else
2896                                 sd_config_discard(sdkp, SD_LBP_WS16);
2897
2898                 } else {        /* LBP VPD page tells us what to use */
2899                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2900                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2901                         else if (sdkp->lbpws)
2902                                 sd_config_discard(sdkp, SD_LBP_WS16);
2903                         else if (sdkp->lbpws10)
2904                                 sd_config_discard(sdkp, SD_LBP_WS10);
2905                         else
2906                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2907                 }
2908         }
2909
2910  out:
2911         kfree(buffer);
2912 }
2913
2914 /**
2915  * sd_read_block_characteristics - Query block dev. characteristics
2916  * @sdkp: disk to query
2917  */
2918 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2919 {
2920         struct request_queue *q = sdkp->disk->queue;
2921         unsigned char *buffer;
2922         u16 rot;
2923         const int vpd_len = 64;
2924
2925         buffer = kmalloc(vpd_len, GFP_KERNEL);
2926
2927         if (!buffer ||
2928             /* Block Device Characteristics VPD */
2929             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2930                 goto out;
2931
2932         rot = get_unaligned_be16(&buffer[4]);
2933
2934         if (rot == 1) {
2935                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2936                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2937         }
2938
2939         if (sdkp->device->type == TYPE_ZBC) {
2940                 /* Host-managed */
2941                 q->limits.zoned = BLK_ZONED_HM;
2942         } else {
2943                 sdkp->zoned = (buffer[8] >> 4) & 3;
2944                 if (sdkp->zoned == 1)
2945                         /* Host-aware */
2946                         q->limits.zoned = BLK_ZONED_HA;
2947                 else
2948                         /*
2949                          * Treat drive-managed devices as
2950                          * regular block devices.
2951                          */
2952                         q->limits.zoned = BLK_ZONED_NONE;
2953         }
2954         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2955                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2956                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2957
2958  out:
2959         kfree(buffer);
2960 }
2961
2962 /**
2963  * sd_read_block_provisioning - Query provisioning VPD page
2964  * @sdkp: disk to query
2965  */
2966 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2967 {
2968         unsigned char *buffer;
2969         const int vpd_len = 8;
2970
2971         if (sdkp->lbpme == 0)
2972                 return;
2973
2974         buffer = kmalloc(vpd_len, GFP_KERNEL);
2975
2976         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2977                 goto out;
2978
2979         sdkp->lbpvpd    = 1;
2980         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2981         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2982         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2983
2984  out:
2985         kfree(buffer);
2986 }
2987
2988 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2989 {
2990         struct scsi_device *sdev = sdkp->device;
2991
2992         if (sdev->host->no_write_same) {
2993                 sdev->no_write_same = 1;
2994
2995                 return;
2996         }
2997
2998         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2999                 /* too large values might cause issues with arcmsr */
3000                 int vpd_buf_len = 64;
3001
3002                 sdev->no_report_opcodes = 1;
3003
3004                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3005                  * CODES is unsupported and the device has an ATA
3006                  * Information VPD page (SAT).
3007                  */
3008                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3009                         sdev->no_write_same = 1;
3010         }
3011
3012         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3013                 sdkp->ws16 = 1;
3014
3015         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3016                 sdkp->ws10 = 1;
3017 }
3018
3019 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3020 {
3021         struct scsi_device *sdev = sdkp->device;
3022
3023         if (!sdev->security_supported)
3024                 return;
3025
3026         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3027                         SECURITY_PROTOCOL_IN) == 1 &&
3028             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3029                         SECURITY_PROTOCOL_OUT) == 1)
3030                 sdkp->security = 1;
3031 }
3032
3033 /*
3034  * Determine the device's preferred I/O size for reads and writes
3035  * unless the reported value is unreasonably small, large, not a
3036  * multiple of the physical block size, or simply garbage.
3037  */
3038 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3039                                       unsigned int dev_max)
3040 {
3041         struct scsi_device *sdp = sdkp->device;
3042         unsigned int opt_xfer_bytes =
3043                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3044
3045         if (sdkp->opt_xfer_blocks == 0)
3046                 return false;
3047
3048         if (sdkp->opt_xfer_blocks > dev_max) {
3049                 sd_first_printk(KERN_WARNING, sdkp,
3050                                 "Optimal transfer size %u logical blocks " \
3051                                 "> dev_max (%u logical blocks)\n",
3052                                 sdkp->opt_xfer_blocks, dev_max);
3053                 return false;
3054         }
3055
3056         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3057                 sd_first_printk(KERN_WARNING, sdkp,
3058                                 "Optimal transfer size %u logical blocks " \
3059                                 "> sd driver limit (%u logical blocks)\n",
3060                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3061                 return false;
3062         }
3063
3064         if (opt_xfer_bytes < PAGE_SIZE) {
3065                 sd_first_printk(KERN_WARNING, sdkp,
3066                                 "Optimal transfer size %u bytes < " \
3067                                 "PAGE_SIZE (%u bytes)\n",
3068                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3069                 return false;
3070         }
3071
3072         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3073                 sd_first_printk(KERN_WARNING, sdkp,
3074                                 "Optimal transfer size %u bytes not a " \
3075                                 "multiple of physical block size (%u bytes)\n",
3076                                 opt_xfer_bytes, sdkp->physical_block_size);
3077                 return false;
3078         }
3079
3080         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3081                         opt_xfer_bytes);
3082         return true;
3083 }
3084
3085 /**
3086  *      sd_revalidate_disk - called the first time a new disk is seen,
3087  *      performs disk spin up, read_capacity, etc.
3088  *      @disk: struct gendisk we care about
3089  **/
3090 static int sd_revalidate_disk(struct gendisk *disk)
3091 {
3092         struct scsi_disk *sdkp = scsi_disk(disk);
3093         struct scsi_device *sdp = sdkp->device;
3094         struct request_queue *q = sdkp->disk->queue;
3095         sector_t old_capacity = sdkp->capacity;
3096         unsigned char *buffer;
3097         unsigned int dev_max, rw_max;
3098
3099         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3100                                       "sd_revalidate_disk\n"));
3101
3102         /*
3103          * If the device is offline, don't try and read capacity or any
3104          * of the other niceties.
3105          */
3106         if (!scsi_device_online(sdp))
3107                 goto out;
3108
3109         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3110         if (!buffer) {
3111                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3112                           "allocation failure.\n");
3113                 goto out;
3114         }
3115
3116         sd_spinup_disk(sdkp);
3117
3118         /*
3119          * Without media there is no reason to ask; moreover, some devices
3120          * react badly if we do.
3121          */
3122         if (sdkp->media_present) {
3123                 sd_read_capacity(sdkp, buffer);
3124
3125                 /*
3126                  * set the default to rotational.  All non-rotational devices
3127                  * support the block characteristics VPD page, which will
3128                  * cause this to be updated correctly and any device which
3129                  * doesn't support it should be treated as rotational.
3130                  */
3131                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3132                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3133
3134                 if (scsi_device_supports_vpd(sdp)) {
3135                         sd_read_block_provisioning(sdkp);
3136                         sd_read_block_limits(sdkp);
3137                         sd_read_block_characteristics(sdkp);
3138                         sd_zbc_read_zones(sdkp, buffer);
3139                 }
3140
3141                 sd_print_capacity(sdkp, old_capacity);
3142
3143                 sd_read_write_protect_flag(sdkp, buffer);
3144                 sd_read_cache_type(sdkp, buffer);
3145                 sd_read_app_tag_own(sdkp, buffer);
3146                 sd_read_write_same(sdkp, buffer);
3147                 sd_read_security(sdkp, buffer);
3148         }
3149
3150         /*
3151          * We now have all cache related info, determine how we deal
3152          * with flush requests.
3153          */
3154         sd_set_flush_flag(sdkp);
3155
3156         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3157         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3158
3159         /* Some devices report a maximum block count for READ/WRITE requests. */
3160         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3161         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3162
3163         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3164                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3165                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3166         } else
3167                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3168                                       (sector_t)BLK_DEF_MAX_SECTORS);
3169
3170         /* Do not exceed controller limit */
3171         rw_max = min(rw_max, queue_max_hw_sectors(q));
3172
3173         /*
3174          * Only update max_sectors if previously unset or if the current value
3175          * exceeds the capabilities of the hardware.
3176          */
3177         if (sdkp->first_scan ||
3178             q->limits.max_sectors > q->limits.max_dev_sectors ||
3179             q->limits.max_sectors > q->limits.max_hw_sectors)
3180                 q->limits.max_sectors = rw_max;
3181
3182         sdkp->first_scan = 0;
3183
3184         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3185         sd_config_write_same(sdkp);
3186         kfree(buffer);
3187
3188  out:
3189         return 0;
3190 }
3191
3192 /**
3193  *      sd_unlock_native_capacity - unlock native capacity
3194  *      @disk: struct gendisk to set capacity for
3195  *
3196  *      Block layer calls this function if it detects that partitions
3197  *      on @disk reach beyond the end of the device.  If the SCSI host
3198  *      implements ->unlock_native_capacity() method, it's invoked to
3199  *      give it a chance to adjust the device capacity.
3200  *
3201  *      CONTEXT:
3202  *      Defined by block layer.  Might sleep.
3203  */
3204 static void sd_unlock_native_capacity(struct gendisk *disk)
3205 {
3206         struct scsi_device *sdev = scsi_disk(disk)->device;
3207
3208         if (sdev->host->hostt->unlock_native_capacity)
3209                 sdev->host->hostt->unlock_native_capacity(sdev);
3210 }
3211
3212 /**
3213  *      sd_format_disk_name - format disk name
3214  *      @prefix: name prefix - ie. "sd" for SCSI disks
3215  *      @index: index of the disk to format name for
3216  *      @buf: output buffer
3217  *      @buflen: length of the output buffer
3218  *
3219  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3220  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3221  *      which is followed by sdaaa.
3222  *
3223  *      This is basically 26 base counting with one extra 'nil' entry
3224  *      at the beginning from the second digit on and can be
3225  *      determined using similar method as 26 base conversion with the
3226  *      index shifted -1 after each digit is computed.
3227  *
3228  *      CONTEXT:
3229  *      Don't care.
3230  *
3231  *      RETURNS:
3232  *      0 on success, -errno on failure.
3233  */
3234 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3235 {
3236         const int base = 'z' - 'a' + 1;
3237         char *begin = buf + strlen(prefix);
3238         char *end = buf + buflen;