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[~shefty/rdma-dev.git] / drivers / scsi / sd.c
1 /*
2  *      sd.c Copyright (C) 1992 Drew Eckhardt
3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4  *
5  *      Linux scsi disk driver
6  *              Initial versions: Drew Eckhardt
7  *              Subsequent revisions: Eric Youngdale
8  *      Modification history:
9  *       - Drew Eckhardt <drew@colorado.edu> original
10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
11  *         outstanding request, and other enhancements.
12  *         Support loadable low-level scsi drivers.
13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
14  *         eight major numbers.
15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
17  *         sd_init and cleanups.
18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
19  *         not being read in sd_open. Fix problem where removable media 
20  *         could be ejected after sd_open.
21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
24  *         Support 32k/1M disks.
25  *
26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
31  *      Note: when the logging level is set by the user, it must be greater
32  *      than the level indicated above to trigger output.       
33  */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
56
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
66
67 #include "sd.h"
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
70
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
74
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS       16
97 #else
98 #define SD_MINORS       0
99 #endif
100
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int  sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int  sd_probe(struct device *);
106 static int  sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend(struct device *, pm_message_t state);
109 static int sd_resume(struct device *);
110 static void sd_rescan(struct device *);
111 static int sd_done(struct scsi_cmnd *);
112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
114 static void scsi_disk_release(struct device *cdev);
115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116 static void sd_print_result(struct scsi_disk *, int);
117
118 static DEFINE_SPINLOCK(sd_index_lock);
119 static DEFINE_IDA(sd_index_ida);
120
121 /* This semaphore is used to mediate the 0->1 reference get in the
122  * face of object destruction (i.e. we can't allow a get on an
123  * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex);
125
126 static struct kmem_cache *sd_cdb_cache;
127 static mempool_t *sd_cdb_pool;
128
129 static const char *sd_cache_types[] = {
130         "write through", "none", "write back",
131         "write back, no read (daft)"
132 };
133
134 static ssize_t
135 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136                     const char *buf, size_t count)
137 {
138         int i, ct = -1, rcd, wce, sp;
139         struct scsi_disk *sdkp = to_scsi_disk(dev);
140         struct scsi_device *sdp = sdkp->device;
141         char buffer[64];
142         char *buffer_data;
143         struct scsi_mode_data data;
144         struct scsi_sense_hdr sshdr;
145         int len;
146
147         if (sdp->type != TYPE_DISK)
148                 /* no cache control on RBC devices; theoretically they
149                  * can do it, but there's probably so many exceptions
150                  * it's not worth the risk */
151                 return -EINVAL;
152
153         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
154                 len = strlen(sd_cache_types[i]);
155                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
156                     buf[len] == '\n') {
157                         ct = i;
158                         break;
159                 }
160         }
161         if (ct < 0)
162                 return -EINVAL;
163         rcd = ct & 0x01 ? 1 : 0;
164         wce = ct & 0x02 ? 1 : 0;
165         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
166                             SD_MAX_RETRIES, &data, NULL))
167                 return -EINVAL;
168         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
169                   data.block_descriptor_length);
170         buffer_data = buffer + data.header_length +
171                 data.block_descriptor_length;
172         buffer_data[2] &= ~0x05;
173         buffer_data[2] |= wce << 2 | rcd;
174         sp = buffer_data[0] & 0x80 ? 1 : 0;
175
176         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
177                              SD_MAX_RETRIES, &data, &sshdr)) {
178                 if (scsi_sense_valid(&sshdr))
179                         sd_print_sense_hdr(sdkp, &sshdr);
180                 return -EINVAL;
181         }
182         revalidate_disk(sdkp->disk);
183         return count;
184 }
185
186 static ssize_t
187 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
188                            const char *buf, size_t count)
189 {
190         struct scsi_disk *sdkp = to_scsi_disk(dev);
191         struct scsi_device *sdp = sdkp->device;
192
193         if (!capable(CAP_SYS_ADMIN))
194                 return -EACCES;
195
196         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
197
198         return count;
199 }
200
201 static ssize_t
202 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
203                        const char *buf, size_t count)
204 {
205         struct scsi_disk *sdkp = to_scsi_disk(dev);
206         struct scsi_device *sdp = sdkp->device;
207
208         if (!capable(CAP_SYS_ADMIN))
209                 return -EACCES;
210
211         if (sdp->type != TYPE_DISK)
212                 return -EINVAL;
213
214         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
215
216         return count;
217 }
218
219 static ssize_t
220 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
221                    char *buf)
222 {
223         struct scsi_disk *sdkp = to_scsi_disk(dev);
224         int ct = sdkp->RCD + 2*sdkp->WCE;
225
226         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
227 }
228
229 static ssize_t
230 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
231 {
232         struct scsi_disk *sdkp = to_scsi_disk(dev);
233
234         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
235 }
236
237 static ssize_t
238 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
239                           char *buf)
240 {
241         struct scsi_disk *sdkp = to_scsi_disk(dev);
242         struct scsi_device *sdp = sdkp->device;
243
244         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
245 }
246
247 static ssize_t
248 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
249                       char *buf)
250 {
251         struct scsi_disk *sdkp = to_scsi_disk(dev);
252
253         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
254 }
255
256 static ssize_t
257 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
258                         char *buf)
259 {
260         struct scsi_disk *sdkp = to_scsi_disk(dev);
261
262         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
263 }
264
265 static ssize_t
266 sd_store_protection_type(struct device *dev, struct device_attribute *attr,
267                          const char *buf, size_t count)
268 {
269         struct scsi_disk *sdkp = to_scsi_disk(dev);
270         unsigned int val;
271         int err;
272
273         if (!capable(CAP_SYS_ADMIN))
274                 return -EACCES;
275
276         err = kstrtouint(buf, 10, &val);
277
278         if (err)
279                 return err;
280
281         if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
282                 sdkp->protection_type = val;
283
284         return count;
285 }
286
287 static ssize_t
288 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
289                         char *buf)
290 {
291         struct scsi_disk *sdkp = to_scsi_disk(dev);
292         struct scsi_device *sdp = sdkp->device;
293         unsigned int dif, dix;
294
295         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
296         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
297
298         if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
299                 dif = 0;
300                 dix = 1;
301         }
302
303         if (!dif && !dix)
304                 return snprintf(buf, 20, "none\n");
305
306         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
307 }
308
309 static ssize_t
310 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
311                     char *buf)
312 {
313         struct scsi_disk *sdkp = to_scsi_disk(dev);
314
315         return snprintf(buf, 20, "%u\n", sdkp->ATO);
316 }
317
318 static ssize_t
319 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
320                           char *buf)
321 {
322         struct scsi_disk *sdkp = to_scsi_disk(dev);
323
324         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
325 }
326
327 static const char *lbp_mode[] = {
328         [SD_LBP_FULL]           = "full",
329         [SD_LBP_UNMAP]          = "unmap",
330         [SD_LBP_WS16]           = "writesame_16",
331         [SD_LBP_WS10]           = "writesame_10",
332         [SD_LBP_ZERO]           = "writesame_zero",
333         [SD_LBP_DISABLE]        = "disabled",
334 };
335
336 static ssize_t
337 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
338                           char *buf)
339 {
340         struct scsi_disk *sdkp = to_scsi_disk(dev);
341
342         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
343 }
344
345 static ssize_t
346 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
347                            const char *buf, size_t count)
348 {
349         struct scsi_disk *sdkp = to_scsi_disk(dev);
350         struct scsi_device *sdp = sdkp->device;
351
352         if (!capable(CAP_SYS_ADMIN))
353                 return -EACCES;
354
355         if (sdp->type != TYPE_DISK)
356                 return -EINVAL;
357
358         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
359                 sd_config_discard(sdkp, SD_LBP_UNMAP);
360         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
361                 sd_config_discard(sdkp, SD_LBP_WS16);
362         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
363                 sd_config_discard(sdkp, SD_LBP_WS10);
364         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
365                 sd_config_discard(sdkp, SD_LBP_ZERO);
366         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
367                 sd_config_discard(sdkp, SD_LBP_DISABLE);
368         else
369                 return -EINVAL;
370
371         return count;
372 }
373
374 static ssize_t
375 sd_show_max_medium_access_timeouts(struct device *dev,
376                                    struct device_attribute *attr, char *buf)
377 {
378         struct scsi_disk *sdkp = to_scsi_disk(dev);
379
380         return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
381 }
382
383 static ssize_t
384 sd_store_max_medium_access_timeouts(struct device *dev,
385                                     struct device_attribute *attr,
386                                     const char *buf, size_t count)
387 {
388         struct scsi_disk *sdkp = to_scsi_disk(dev);
389         int err;
390
391         if (!capable(CAP_SYS_ADMIN))
392                 return -EACCES;
393
394         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
395
396         return err ? err : count;
397 }
398
399 static ssize_t
400 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
401                           char *buf)
402 {
403         struct scsi_disk *sdkp = to_scsi_disk(dev);
404
405         return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
406 }
407
408 static ssize_t
409 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
410                            const char *buf, size_t count)
411 {
412         struct scsi_disk *sdkp = to_scsi_disk(dev);
413         struct scsi_device *sdp = sdkp->device;
414         unsigned long max;
415         int err;
416
417         if (!capable(CAP_SYS_ADMIN))
418                 return -EACCES;
419
420         if (sdp->type != TYPE_DISK)
421                 return -EINVAL;
422
423         err = kstrtoul(buf, 10, &max);
424
425         if (err)
426                 return err;
427
428         if (max == 0)
429                 sdp->no_write_same = 1;
430         else if (max <= SD_MAX_WS16_BLOCKS)
431                 sdkp->max_ws_blocks = max;
432
433         sd_config_write_same(sdkp);
434
435         return count;
436 }
437
438 static struct device_attribute sd_disk_attrs[] = {
439         __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
440                sd_store_cache_type),
441         __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
442         __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
443                sd_store_allow_restart),
444         __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
445                sd_store_manage_start_stop),
446         __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
447                sd_store_protection_type),
448         __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
449         __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
450         __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
451         __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
452                sd_store_provisioning_mode),
453         __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
454                sd_show_write_same_blocks, sd_store_write_same_blocks),
455         __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
456                sd_show_max_medium_access_timeouts,
457                sd_store_max_medium_access_timeouts),
458         __ATTR_NULL,
459 };
460
461 static struct class sd_disk_class = {
462         .name           = "scsi_disk",
463         .owner          = THIS_MODULE,
464         .dev_release    = scsi_disk_release,
465         .dev_attrs      = sd_disk_attrs,
466 };
467
468 static struct scsi_driver sd_template = {
469         .owner                  = THIS_MODULE,
470         .gendrv = {
471                 .name           = "sd",
472                 .probe          = sd_probe,
473                 .remove         = sd_remove,
474                 .suspend        = sd_suspend,
475                 .resume         = sd_resume,
476                 .shutdown       = sd_shutdown,
477         },
478         .rescan                 = sd_rescan,
479         .done                   = sd_done,
480         .eh_action              = sd_eh_action,
481 };
482
483 /*
484  * Device no to disk mapping:
485  * 
486  *       major         disc2     disc  p1
487  *   |............|.............|....|....| <- dev_t
488  *    31        20 19          8 7  4 3  0
489  * 
490  * Inside a major, we have 16k disks, however mapped non-
491  * contiguously. The first 16 disks are for major0, the next
492  * ones with major1, ... Disk 256 is for major0 again, disk 272 
493  * for major1, ... 
494  * As we stay compatible with our numbering scheme, we can reuse 
495  * the well-know SCSI majors 8, 65--71, 136--143.
496  */
497 static int sd_major(int major_idx)
498 {
499         switch (major_idx) {
500         case 0:
501                 return SCSI_DISK0_MAJOR;
502         case 1 ... 7:
503                 return SCSI_DISK1_MAJOR + major_idx - 1;
504         case 8 ... 15:
505                 return SCSI_DISK8_MAJOR + major_idx - 8;
506         default:
507                 BUG();
508                 return 0;       /* shut up gcc */
509         }
510 }
511
512 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
513 {
514         struct scsi_disk *sdkp = NULL;
515
516         if (disk->private_data) {
517                 sdkp = scsi_disk(disk);
518                 if (scsi_device_get(sdkp->device) == 0)
519                         get_device(&sdkp->dev);
520                 else
521                         sdkp = NULL;
522         }
523         return sdkp;
524 }
525
526 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
527 {
528         struct scsi_disk *sdkp;
529
530         mutex_lock(&sd_ref_mutex);
531         sdkp = __scsi_disk_get(disk);
532         mutex_unlock(&sd_ref_mutex);
533         return sdkp;
534 }
535
536 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
537 {
538         struct scsi_disk *sdkp;
539
540         mutex_lock(&sd_ref_mutex);
541         sdkp = dev_get_drvdata(dev);
542         if (sdkp)
543                 sdkp = __scsi_disk_get(sdkp->disk);
544         mutex_unlock(&sd_ref_mutex);
545         return sdkp;
546 }
547
548 static void scsi_disk_put(struct scsi_disk *sdkp)
549 {
550         struct scsi_device *sdev = sdkp->device;
551
552         mutex_lock(&sd_ref_mutex);
553         put_device(&sdkp->dev);
554         scsi_device_put(sdev);
555         mutex_unlock(&sd_ref_mutex);
556 }
557
558 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
559 {
560         unsigned int prot_op = SCSI_PROT_NORMAL;
561         unsigned int dix = scsi_prot_sg_count(scmd);
562
563         if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
564                 if (dif && dix)
565                         prot_op = SCSI_PROT_READ_PASS;
566                 else if (dif && !dix)
567                         prot_op = SCSI_PROT_READ_STRIP;
568                 else if (!dif && dix)
569                         prot_op = SCSI_PROT_READ_INSERT;
570         } else {
571                 if (dif && dix)
572                         prot_op = SCSI_PROT_WRITE_PASS;
573                 else if (dif && !dix)
574                         prot_op = SCSI_PROT_WRITE_INSERT;
575                 else if (!dif && dix)
576                         prot_op = SCSI_PROT_WRITE_STRIP;
577         }
578
579         scsi_set_prot_op(scmd, prot_op);
580         scsi_set_prot_type(scmd, dif);
581 }
582
583 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
584 {
585         struct request_queue *q = sdkp->disk->queue;
586         unsigned int logical_block_size = sdkp->device->sector_size;
587         unsigned int max_blocks = 0;
588
589         q->limits.discard_zeroes_data = sdkp->lbprz;
590         q->limits.discard_alignment = sdkp->unmap_alignment *
591                 logical_block_size;
592         q->limits.discard_granularity =
593                 max(sdkp->physical_block_size,
594                     sdkp->unmap_granularity * logical_block_size);
595
596         sdkp->provisioning_mode = mode;
597
598         switch (mode) {
599
600         case SD_LBP_DISABLE:
601                 q->limits.max_discard_sectors = 0;
602                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
603                 return;
604
605         case SD_LBP_UNMAP:
606                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
607                                           (u32)SD_MAX_WS16_BLOCKS);
608                 break;
609
610         case SD_LBP_WS16:
611                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
612                                           (u32)SD_MAX_WS16_BLOCKS);
613                 break;
614
615         case SD_LBP_WS10:
616                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
617                                           (u32)SD_MAX_WS10_BLOCKS);
618                 break;
619
620         case SD_LBP_ZERO:
621                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
622                                           (u32)SD_MAX_WS10_BLOCKS);
623                 q->limits.discard_zeroes_data = 1;
624                 break;
625         }
626
627         q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
628         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
629 }
630
631 /**
632  * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
633  * @sdp: scsi device to operate one
634  * @rq: Request to prepare
635  *
636  * Will issue either UNMAP or WRITE SAME(16) depending on preference
637  * indicated by target device.
638  **/
639 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
640 {
641         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
642         sector_t sector = blk_rq_pos(rq);
643         unsigned int nr_sectors = blk_rq_sectors(rq);
644         unsigned int nr_bytes = blk_rq_bytes(rq);
645         unsigned int len;
646         int ret;
647         char *buf;
648         struct page *page;
649
650         sector >>= ilog2(sdp->sector_size) - 9;
651         nr_sectors >>= ilog2(sdp->sector_size) - 9;
652         rq->timeout = SD_TIMEOUT;
653
654         memset(rq->cmd, 0, rq->cmd_len);
655
656         page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
657         if (!page)
658                 return BLKPREP_DEFER;
659
660         switch (sdkp->provisioning_mode) {
661         case SD_LBP_UNMAP:
662                 buf = page_address(page);
663
664                 rq->cmd_len = 10;
665                 rq->cmd[0] = UNMAP;
666                 rq->cmd[8] = 24;
667
668                 put_unaligned_be16(6 + 16, &buf[0]);
669                 put_unaligned_be16(16, &buf[2]);
670                 put_unaligned_be64(sector, &buf[8]);
671                 put_unaligned_be32(nr_sectors, &buf[16]);
672
673                 len = 24;
674                 break;
675
676         case SD_LBP_WS16:
677                 rq->cmd_len = 16;
678                 rq->cmd[0] = WRITE_SAME_16;
679                 rq->cmd[1] = 0x8; /* UNMAP */
680                 put_unaligned_be64(sector, &rq->cmd[2]);
681                 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
682
683                 len = sdkp->device->sector_size;
684                 break;
685
686         case SD_LBP_WS10:
687         case SD_LBP_ZERO:
688                 rq->cmd_len = 10;
689                 rq->cmd[0] = WRITE_SAME;
690                 if (sdkp->provisioning_mode == SD_LBP_WS10)
691                         rq->cmd[1] = 0x8; /* UNMAP */
692                 put_unaligned_be32(sector, &rq->cmd[2]);
693                 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
694
695                 len = sdkp->device->sector_size;
696                 break;
697
698         default:
699                 ret = BLKPREP_KILL;
700                 goto out;
701         }
702
703         blk_add_request_payload(rq, page, len);
704         ret = scsi_setup_blk_pc_cmnd(sdp, rq);
705         rq->buffer = page_address(page);
706         rq->__data_len = nr_bytes;
707
708 out:
709         if (ret != BLKPREP_OK) {
710                 __free_page(page);
711                 rq->buffer = NULL;
712         }
713         return ret;
714 }
715
716 static void sd_config_write_same(struct scsi_disk *sdkp)
717 {
718         struct request_queue *q = sdkp->disk->queue;
719         unsigned int logical_block_size = sdkp->device->sector_size;
720         unsigned int blocks = 0;
721
722         if (sdkp->device->no_write_same) {
723                 sdkp->max_ws_blocks = 0;
724                 goto out;
725         }
726
727         /* Some devices can not handle block counts above 0xffff despite
728          * supporting WRITE SAME(16). Consequently we default to 64k
729          * blocks per I/O unless the device explicitly advertises a
730          * bigger limit.
731          */
732         if (sdkp->max_ws_blocks == 0)
733                 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
734
735         if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
736                 blocks = min_not_zero(sdkp->max_ws_blocks,
737                                       (u32)SD_MAX_WS16_BLOCKS);
738         else
739                 blocks = min_not_zero(sdkp->max_ws_blocks,
740                                       (u32)SD_MAX_WS10_BLOCKS);
741
742 out:
743         blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
744 }
745
746 /**
747  * sd_setup_write_same_cmnd - write the same data to multiple blocks
748  * @sdp: scsi device to operate one
749  * @rq: Request to prepare
750  *
751  * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
752  * preference indicated by target device.
753  **/
754 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
755 {
756         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
757         struct bio *bio = rq->bio;
758         sector_t sector = blk_rq_pos(rq);
759         unsigned int nr_sectors = blk_rq_sectors(rq);
760         unsigned int nr_bytes = blk_rq_bytes(rq);
761         int ret;
762
763         if (sdkp->device->no_write_same)
764                 return BLKPREP_KILL;
765
766         BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
767
768         sector >>= ilog2(sdp->sector_size) - 9;
769         nr_sectors >>= ilog2(sdp->sector_size) - 9;
770
771         rq->__data_len = sdp->sector_size;
772         rq->timeout = SD_WRITE_SAME_TIMEOUT;
773         memset(rq->cmd, 0, rq->cmd_len);
774
775         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
776                 rq->cmd_len = 16;
777                 rq->cmd[0] = WRITE_SAME_16;
778                 put_unaligned_be64(sector, &rq->cmd[2]);
779                 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
780         } else {
781                 rq->cmd_len = 10;
782                 rq->cmd[0] = WRITE_SAME;
783                 put_unaligned_be32(sector, &rq->cmd[2]);
784                 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
785         }
786
787         ret = scsi_setup_blk_pc_cmnd(sdp, rq);
788         rq->__data_len = nr_bytes;
789
790         return ret;
791 }
792
793 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
794 {
795         rq->timeout = SD_FLUSH_TIMEOUT;
796         rq->retries = SD_MAX_RETRIES;
797         rq->cmd[0] = SYNCHRONIZE_CACHE;
798         rq->cmd_len = 10;
799
800         return scsi_setup_blk_pc_cmnd(sdp, rq);
801 }
802
803 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
804 {
805         if (rq->cmd_flags & REQ_DISCARD) {
806                 free_page((unsigned long)rq->buffer);
807                 rq->buffer = NULL;
808         }
809 }
810
811 /**
812  *      sd_prep_fn - build a scsi (read or write) command from
813  *      information in the request structure.
814  *      @SCpnt: pointer to mid-level's per scsi command structure that
815  *      contains request and into which the scsi command is written
816  *
817  *      Returns 1 if successful and 0 if error (or cannot be done now).
818  **/
819 static int sd_prep_fn(struct request_queue *q, struct request *rq)
820 {
821         struct scsi_cmnd *SCpnt;
822         struct scsi_device *sdp = q->queuedata;
823         struct gendisk *disk = rq->rq_disk;
824         struct scsi_disk *sdkp;
825         sector_t block = blk_rq_pos(rq);
826         sector_t threshold;
827         unsigned int this_count = blk_rq_sectors(rq);
828         int ret, host_dif;
829         unsigned char protect;
830
831         /*
832          * Discard request come in as REQ_TYPE_FS but we turn them into
833          * block PC requests to make life easier.
834          */
835         if (rq->cmd_flags & REQ_DISCARD) {
836                 ret = sd_setup_discard_cmnd(sdp, rq);
837                 goto out;
838         } else if (rq->cmd_flags & REQ_WRITE_SAME) {
839                 ret = sd_setup_write_same_cmnd(sdp, rq);
840                 goto out;
841         } else if (rq->cmd_flags & REQ_FLUSH) {
842                 ret = scsi_setup_flush_cmnd(sdp, rq);
843                 goto out;
844         } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
845                 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
846                 goto out;
847         } else if (rq->cmd_type != REQ_TYPE_FS) {
848                 ret = BLKPREP_KILL;
849                 goto out;
850         }
851         ret = scsi_setup_fs_cmnd(sdp, rq);
852         if (ret != BLKPREP_OK)
853                 goto out;
854         SCpnt = rq->special;
855         sdkp = scsi_disk(disk);
856
857         /* from here on until we're complete, any goto out
858          * is used for a killable error condition */
859         ret = BLKPREP_KILL;
860
861         SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
862                                         "sd_prep_fn: block=%llu, "
863                                         "count=%d\n",
864                                         (unsigned long long)block,
865                                         this_count));
866
867         if (!sdp || !scsi_device_online(sdp) ||
868             block + blk_rq_sectors(rq) > get_capacity(disk)) {
869                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
870                                                 "Finishing %u sectors\n",
871                                                 blk_rq_sectors(rq)));
872                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
873                                                 "Retry with 0x%p\n", SCpnt));
874                 goto out;
875         }
876
877         if (sdp->changed) {
878                 /*
879                  * quietly refuse to do anything to a changed disc until 
880                  * the changed bit has been reset
881                  */
882                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
883                 goto out;
884         }
885
886         /*
887          * Some SD card readers can't handle multi-sector accesses which touch
888          * the last one or two hardware sectors.  Split accesses as needed.
889          */
890         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
891                 (sdp->sector_size / 512);
892
893         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
894                 if (block < threshold) {
895                         /* Access up to the threshold but not beyond */
896                         this_count = threshold - block;
897                 } else {
898                         /* Access only a single hardware sector */
899                         this_count = sdp->sector_size / 512;
900                 }
901         }
902
903         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
904                                         (unsigned long long)block));
905
906         /*
907          * If we have a 1K hardware sectorsize, prevent access to single
908          * 512 byte sectors.  In theory we could handle this - in fact
909          * the scsi cdrom driver must be able to handle this because
910          * we typically use 1K blocksizes, and cdroms typically have
911          * 2K hardware sectorsizes.  Of course, things are simpler
912          * with the cdrom, since it is read-only.  For performance
913          * reasons, the filesystems should be able to handle this
914          * and not force the scsi disk driver to use bounce buffers
915          * for this.
916          */
917         if (sdp->sector_size == 1024) {
918                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
919                         scmd_printk(KERN_ERR, SCpnt,
920                                     "Bad block number requested\n");
921                         goto out;
922                 } else {
923                         block = block >> 1;
924                         this_count = this_count >> 1;
925                 }
926         }
927         if (sdp->sector_size == 2048) {
928                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
929                         scmd_printk(KERN_ERR, SCpnt,
930                                     "Bad block number requested\n");
931                         goto out;
932                 } else {
933                         block = block >> 2;
934                         this_count = this_count >> 2;
935                 }
936         }
937         if (sdp->sector_size == 4096) {
938                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
939                         scmd_printk(KERN_ERR, SCpnt,
940                                     "Bad block number requested\n");
941                         goto out;
942                 } else {
943                         block = block >> 3;
944                         this_count = this_count >> 3;
945                 }
946         }
947         if (rq_data_dir(rq) == WRITE) {
948                 if (!sdp->writeable) {
949                         goto out;
950                 }
951                 SCpnt->cmnd[0] = WRITE_6;
952                 SCpnt->sc_data_direction = DMA_TO_DEVICE;
953
954                 if (blk_integrity_rq(rq))
955                         sd_dif_prepare(rq, block, sdp->sector_size);
956
957         } else if (rq_data_dir(rq) == READ) {
958                 SCpnt->cmnd[0] = READ_6;
959                 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
960         } else {
961                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
962                 goto out;
963         }
964
965         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
966                                         "%s %d/%u 512 byte blocks.\n",
967                                         (rq_data_dir(rq) == WRITE) ?
968                                         "writing" : "reading", this_count,
969                                         blk_rq_sectors(rq)));
970
971         /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
972         host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
973         if (host_dif)
974                 protect = 1 << 5;
975         else
976                 protect = 0;
977
978         if (host_dif == SD_DIF_TYPE2_PROTECTION) {
979                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
980
981                 if (unlikely(SCpnt->cmnd == NULL)) {
982                         ret = BLKPREP_DEFER;
983                         goto out;
984                 }
985
986                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
987                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
988                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
989                 SCpnt->cmnd[7] = 0x18;
990                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
991                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
992
993                 /* LBA */
994                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
995                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
996                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
997                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
998                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
999                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1000                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1001                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1002
1003                 /* Expected Indirect LBA */
1004                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1005                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1006                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1007                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1008
1009                 /* Transfer length */
1010                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1011                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1012                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1013                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1014         } else if (block > 0xffffffff) {
1015                 SCpnt->cmnd[0] += READ_16 - READ_6;
1016                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1017                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1022                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1023                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1024                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1025                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1026                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1027                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1028                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1029                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1030         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1031                    scsi_device_protection(SCpnt->device) ||
1032                    SCpnt->device->use_10_for_rw) {
1033                 if (this_count > 0xffff)
1034                         this_count = 0xffff;
1035
1036                 SCpnt->cmnd[0] += READ_10 - READ_6;
1037                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1038                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1039                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1040                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1041                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1042                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1043                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1044                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1045         } else {
1046                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1047                         /*
1048                          * This happens only if this drive failed
1049                          * 10byte rw command with ILLEGAL_REQUEST
1050                          * during operation and thus turned off
1051                          * use_10_for_rw.
1052                          */
1053                         scmd_printk(KERN_ERR, SCpnt,
1054                                     "FUA write on READ/WRITE(6) drive\n");
1055                         goto out;
1056                 }
1057
1058                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1059                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1060                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1061                 SCpnt->cmnd[4] = (unsigned char) this_count;
1062                 SCpnt->cmnd[5] = 0;
1063         }
1064         SCpnt->sdb.length = this_count * sdp->sector_size;
1065
1066         /* If DIF or DIX is enabled, tell HBA how to handle request */
1067         if (host_dif || scsi_prot_sg_count(SCpnt))
1068                 sd_prot_op(SCpnt, host_dif);
1069
1070         /*
1071          * We shouldn't disconnect in the middle of a sector, so with a dumb
1072          * host adapter, it's safe to assume that we can at least transfer
1073          * this many bytes between each connect / disconnect.
1074          */
1075         SCpnt->transfersize = sdp->sector_size;
1076         SCpnt->underflow = this_count << 9;
1077         SCpnt->allowed = SD_MAX_RETRIES;
1078
1079         /*
1080          * This indicates that the command is ready from our end to be
1081          * queued.
1082          */
1083         ret = BLKPREP_OK;
1084  out:
1085         return scsi_prep_return(q, rq, ret);
1086 }
1087
1088 /**
1089  *      sd_open - open a scsi disk device
1090  *      @inode: only i_rdev member may be used
1091  *      @filp: only f_mode and f_flags may be used
1092  *
1093  *      Returns 0 if successful. Returns a negated errno value in case 
1094  *      of error.
1095  *
1096  *      Note: This can be called from a user context (e.g. fsck(1) )
1097  *      or from within the kernel (e.g. as a result of a mount(1) ).
1098  *      In the latter case @inode and @filp carry an abridged amount
1099  *      of information as noted above.
1100  *
1101  *      Locking: called with bdev->bd_mutex held.
1102  **/
1103 static int sd_open(struct block_device *bdev, fmode_t mode)
1104 {
1105         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1106         struct scsi_device *sdev;
1107         int retval;
1108
1109         if (!sdkp)
1110                 return -ENXIO;
1111
1112         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1113
1114         sdev = sdkp->device;
1115
1116         retval = scsi_autopm_get_device(sdev);
1117         if (retval)
1118                 goto error_autopm;
1119
1120         /*
1121          * If the device is in error recovery, wait until it is done.
1122          * If the device is offline, then disallow any access to it.
1123          */
1124         retval = -ENXIO;
1125         if (!scsi_block_when_processing_errors(sdev))
1126                 goto error_out;
1127
1128         if (sdev->removable || sdkp->write_prot)
1129                 check_disk_change(bdev);
1130
1131         /*
1132          * If the drive is empty, just let the open fail.
1133          */
1134         retval = -ENOMEDIUM;
1135         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1136                 goto error_out;
1137
1138         /*
1139          * If the device has the write protect tab set, have the open fail
1140          * if the user expects to be able to write to the thing.
1141          */
1142         retval = -EROFS;
1143         if (sdkp->write_prot && (mode & FMODE_WRITE))
1144                 goto error_out;
1145
1146         /*
1147          * It is possible that the disk changing stuff resulted in
1148          * the device being taken offline.  If this is the case,
1149          * report this to the user, and don't pretend that the
1150          * open actually succeeded.
1151          */
1152         retval = -ENXIO;
1153         if (!scsi_device_online(sdev))
1154                 goto error_out;
1155
1156         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1157                 if (scsi_block_when_processing_errors(sdev))
1158                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1159         }
1160
1161         return 0;
1162
1163 error_out:
1164         scsi_autopm_put_device(sdev);
1165 error_autopm:
1166         scsi_disk_put(sdkp);
1167         return retval;  
1168 }
1169
1170 /**
1171  *      sd_release - invoked when the (last) close(2) is called on this
1172  *      scsi disk.
1173  *      @inode: only i_rdev member may be used
1174  *      @filp: only f_mode and f_flags may be used
1175  *
1176  *      Returns 0. 
1177  *
1178  *      Note: may block (uninterruptible) if error recovery is underway
1179  *      on this disk.
1180  *
1181  *      Locking: called with bdev->bd_mutex held.
1182  **/
1183 static int sd_release(struct gendisk *disk, fmode_t mode)
1184 {
1185         struct scsi_disk *sdkp = scsi_disk(disk);
1186         struct scsi_device *sdev = sdkp->device;
1187
1188         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1189
1190         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1191                 if (scsi_block_when_processing_errors(sdev))
1192                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1193         }
1194
1195         /*
1196          * XXX and what if there are packets in flight and this close()
1197          * XXX is followed by a "rmmod sd_mod"?
1198          */
1199
1200         scsi_autopm_put_device(sdev);
1201         scsi_disk_put(sdkp);
1202         return 0;
1203 }
1204
1205 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1206 {
1207         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1208         struct scsi_device *sdp = sdkp->device;
1209         struct Scsi_Host *host = sdp->host;
1210         int diskinfo[4];
1211
1212         /* default to most commonly used values */
1213         diskinfo[0] = 0x40;     /* 1 << 6 */
1214         diskinfo[1] = 0x20;     /* 1 << 5 */
1215         diskinfo[2] = sdkp->capacity >> 11;
1216         
1217         /* override with calculated, extended default, or driver values */
1218         if (host->hostt->bios_param)
1219                 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1220         else
1221                 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1222
1223         geo->heads = diskinfo[0];
1224         geo->sectors = diskinfo[1];
1225         geo->cylinders = diskinfo[2];
1226         return 0;
1227 }
1228
1229 /**
1230  *      sd_ioctl - process an ioctl
1231  *      @inode: only i_rdev/i_bdev members may be used
1232  *      @filp: only f_mode and f_flags may be used
1233  *      @cmd: ioctl command number
1234  *      @arg: this is third argument given to ioctl(2) system call.
1235  *      Often contains a pointer.
1236  *
1237  *      Returns 0 if successful (some ioctls return positive numbers on
1238  *      success as well). Returns a negated errno value in case of error.
1239  *
1240  *      Note: most ioctls are forward onto the block subsystem or further
1241  *      down in the scsi subsystem.
1242  **/
1243 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1244                     unsigned int cmd, unsigned long arg)
1245 {
1246         struct gendisk *disk = bdev->bd_disk;
1247         struct scsi_disk *sdkp = scsi_disk(disk);
1248         struct scsi_device *sdp = sdkp->device;
1249         void __user *p = (void __user *)arg;
1250         int error;
1251     
1252         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1253                                     "cmd=0x%x\n", disk->disk_name, cmd));
1254
1255         error = scsi_verify_blk_ioctl(bdev, cmd);
1256         if (error < 0)
1257                 return error;
1258
1259         /*
1260          * If we are in the middle of error recovery, don't let anyone
1261          * else try and use this device.  Also, if error recovery fails, it
1262          * may try and take the device offline, in which case all further
1263          * access to the device is prohibited.
1264          */
1265         error = scsi_nonblockable_ioctl(sdp, cmd, p,
1266                                         (mode & FMODE_NDELAY) != 0);
1267         if (!scsi_block_when_processing_errors(sdp) || !error)
1268                 goto out;
1269
1270         /*
1271          * Send SCSI addressing ioctls directly to mid level, send other
1272          * ioctls to block level and then onto mid level if they can't be
1273          * resolved.
1274          */
1275         switch (cmd) {
1276                 case SCSI_IOCTL_GET_IDLUN:
1277                 case SCSI_IOCTL_GET_BUS_NUMBER:
1278                         error = scsi_ioctl(sdp, cmd, p);
1279                         break;
1280                 default:
1281                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1282                         if (error != -ENOTTY)
1283                                 break;
1284                         error = scsi_ioctl(sdp, cmd, p);
1285                         break;
1286         }
1287 out:
1288         return error;
1289 }
1290
1291 static void set_media_not_present(struct scsi_disk *sdkp)
1292 {
1293         if (sdkp->media_present)
1294                 sdkp->device->changed = 1;
1295
1296         if (sdkp->device->removable) {
1297                 sdkp->media_present = 0;
1298                 sdkp->capacity = 0;
1299         }
1300 }
1301
1302 static int media_not_present(struct scsi_disk *sdkp,
1303                              struct scsi_sense_hdr *sshdr)
1304 {
1305         if (!scsi_sense_valid(sshdr))
1306                 return 0;
1307
1308         /* not invoked for commands that could return deferred errors */
1309         switch (sshdr->sense_key) {
1310         case UNIT_ATTENTION:
1311         case NOT_READY:
1312                 /* medium not present */
1313                 if (sshdr->asc == 0x3A) {
1314                         set_media_not_present(sdkp);
1315                         return 1;
1316                 }
1317         }
1318         return 0;
1319 }
1320
1321 /**
1322  *      sd_check_events - check media events
1323  *      @disk: kernel device descriptor
1324  *      @clearing: disk events currently being cleared
1325  *
1326  *      Returns mask of DISK_EVENT_*.
1327  *
1328  *      Note: this function is invoked from the block subsystem.
1329  **/
1330 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1331 {
1332         struct scsi_disk *sdkp = scsi_disk(disk);
1333         struct scsi_device *sdp = sdkp->device;
1334         struct scsi_sense_hdr *sshdr = NULL;
1335         int retval;
1336
1337         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1338
1339         /*
1340          * If the device is offline, don't send any commands - just pretend as
1341          * if the command failed.  If the device ever comes back online, we
1342          * can deal with it then.  It is only because of unrecoverable errors
1343          * that we would ever take a device offline in the first place.
1344          */
1345         if (!scsi_device_online(sdp)) {
1346                 set_media_not_present(sdkp);
1347                 goto out;
1348         }
1349
1350         /*
1351          * Using TEST_UNIT_READY enables differentiation between drive with
1352          * no cartridge loaded - NOT READY, drive with changed cartridge -
1353          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1354          *
1355          * Drives that auto spin down. eg iomega jaz 1G, will be started
1356          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1357          * sd_revalidate() is called.
1358          */
1359         retval = -ENODEV;
1360
1361         if (scsi_block_when_processing_errors(sdp)) {
1362                 retval = scsi_autopm_get_device(sdp);
1363                 if (retval)
1364                         goto out;
1365
1366                 sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1367                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1368                                               sshdr);
1369                 scsi_autopm_put_device(sdp);
1370         }
1371
1372         /* failed to execute TUR, assume media not present */
1373         if (host_byte(retval)) {
1374                 set_media_not_present(sdkp);
1375                 goto out;
1376         }
1377
1378         if (media_not_present(sdkp, sshdr))
1379                 goto out;
1380
1381         /*
1382          * For removable scsi disk we have to recognise the presence
1383          * of a disk in the drive.
1384          */
1385         if (!sdkp->media_present)
1386                 sdp->changed = 1;
1387         sdkp->media_present = 1;
1388 out:
1389         /*
1390          * sdp->changed is set under the following conditions:
1391          *
1392          *      Medium present state has changed in either direction.
1393          *      Device has indicated UNIT_ATTENTION.
1394          */
1395         kfree(sshdr);
1396         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1397         sdp->changed = 0;
1398         return retval;
1399 }
1400
1401 static int sd_sync_cache(struct scsi_disk *sdkp)
1402 {
1403         int retries, res;
1404         struct scsi_device *sdp = sdkp->device;
1405         struct scsi_sense_hdr sshdr;
1406
1407         if (!scsi_device_online(sdp))
1408                 return -ENODEV;
1409
1410
1411         for (retries = 3; retries > 0; --retries) {
1412                 unsigned char cmd[10] = { 0 };
1413
1414                 cmd[0] = SYNCHRONIZE_CACHE;
1415                 /*
1416                  * Leave the rest of the command zero to indicate
1417                  * flush everything.
1418                  */
1419                 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1420                                        SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1421                 if (res == 0)
1422                         break;
1423         }
1424
1425         if (res) {
1426                 sd_print_result(sdkp, res);
1427                 if (driver_byte(res) & DRIVER_SENSE)
1428                         sd_print_sense_hdr(sdkp, &sshdr);
1429         }
1430
1431         if (res)
1432                 return -EIO;
1433         return 0;
1434 }
1435
1436 static void sd_rescan(struct device *dev)
1437 {
1438         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1439
1440         if (sdkp) {
1441                 revalidate_disk(sdkp->disk);
1442                 scsi_disk_put(sdkp);
1443         }
1444 }
1445
1446
1447 #ifdef CONFIG_COMPAT
1448 /* 
1449  * This gets directly called from VFS. When the ioctl 
1450  * is not recognized we go back to the other translation paths. 
1451  */
1452 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1453                            unsigned int cmd, unsigned long arg)
1454 {
1455         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1456         int ret;
1457
1458         ret = scsi_verify_blk_ioctl(bdev, cmd);
1459         if (ret < 0)
1460                 return ret;
1461
1462         /*
1463          * If we are in the middle of error recovery, don't let anyone
1464          * else try and use this device.  Also, if error recovery fails, it
1465          * may try and take the device offline, in which case all further
1466          * access to the device is prohibited.
1467          */
1468         if (!scsi_block_when_processing_errors(sdev))
1469                 return -ENODEV;
1470                
1471         if (sdev->host->hostt->compat_ioctl) {
1472                 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1473
1474                 return ret;
1475         }
1476
1477         /* 
1478          * Let the static ioctl translation table take care of it.
1479          */
1480         return -ENOIOCTLCMD; 
1481 }
1482 #endif
1483
1484 static const struct block_device_operations sd_fops = {
1485         .owner                  = THIS_MODULE,
1486         .open                   = sd_open,
1487         .release                = sd_release,
1488         .ioctl                  = sd_ioctl,
1489         .getgeo                 = sd_getgeo,
1490 #ifdef CONFIG_COMPAT
1491         .compat_ioctl           = sd_compat_ioctl,
1492 #endif
1493         .check_events           = sd_check_events,
1494         .revalidate_disk        = sd_revalidate_disk,
1495         .unlock_native_capacity = sd_unlock_native_capacity,
1496 };
1497
1498 /**
1499  *      sd_eh_action - error handling callback
1500  *      @scmd:          sd-issued command that has failed
1501  *      @eh_cmnd:       The command that was sent during error handling
1502  *      @eh_cmnd_len:   Length of eh_cmnd in bytes
1503  *      @eh_disp:       The recovery disposition suggested by the midlayer
1504  *
1505  *      This function is called by the SCSI midlayer upon completion of
1506  *      an error handling command (TEST UNIT READY, START STOP UNIT,
1507  *      etc.) The command sent to the device by the error handler is
1508  *      stored in eh_cmnd. The result of sending the eh command is
1509  *      passed in eh_disp.
1510  **/
1511 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1512                         int eh_cmnd_len, int eh_disp)
1513 {
1514         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1515
1516         if (!scsi_device_online(scmd->device) ||
1517             !scsi_medium_access_command(scmd))
1518                 return eh_disp;
1519
1520         /*
1521          * The device has timed out executing a medium access command.
1522          * However, the TEST UNIT READY command sent during error
1523          * handling completed successfully. Either the device is in the
1524          * process of recovering or has it suffered an internal failure
1525          * that prevents access to the storage medium.
1526          */
1527         if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1528             eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1529                 sdkp->medium_access_timed_out++;
1530
1531         /*
1532          * If the device keeps failing read/write commands but TEST UNIT
1533          * READY always completes successfully we assume that medium
1534          * access is no longer possible and take the device offline.
1535          */
1536         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1537                 scmd_printk(KERN_ERR, scmd,
1538                             "Medium access timeout failure. Offlining disk!\n");
1539                 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1540
1541                 return FAILED;
1542         }
1543
1544         return eh_disp;
1545 }
1546
1547 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1548 {
1549         u64 start_lba = blk_rq_pos(scmd->request);
1550         u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1551         u64 bad_lba;
1552         int info_valid;
1553         /*
1554          * resid is optional but mostly filled in.  When it's unused,
1555          * its value is zero, so we assume the whole buffer transferred
1556          */
1557         unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1558         unsigned int good_bytes;
1559
1560         if (scmd->request->cmd_type != REQ_TYPE_FS)
1561                 return 0;
1562
1563         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1564                                              SCSI_SENSE_BUFFERSIZE,
1565                                              &bad_lba);
1566         if (!info_valid)
1567                 return 0;
1568
1569         if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1570                 return 0;
1571
1572         if (scmd->device->sector_size < 512) {
1573                 /* only legitimate sector_size here is 256 */
1574                 start_lba <<= 1;
1575                 end_lba <<= 1;
1576         } else {
1577                 /* be careful ... don't want any overflows */
1578                 u64 factor = scmd->device->sector_size / 512;
1579                 do_div(start_lba, factor);
1580                 do_div(end_lba, factor);
1581         }
1582
1583         /* The bad lba was reported incorrectly, we have no idea where
1584          * the error is.
1585          */
1586         if (bad_lba < start_lba  || bad_lba >= end_lba)
1587                 return 0;
1588
1589         /* This computation should always be done in terms of
1590          * the resolution of the device's medium.
1591          */
1592         good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1593         return min(good_bytes, transferred);
1594 }
1595
1596 /**
1597  *      sd_done - bottom half handler: called when the lower level
1598  *      driver has completed (successfully or otherwise) a scsi command.
1599  *      @SCpnt: mid-level's per command structure.
1600  *
1601  *      Note: potentially run from within an ISR. Must not block.
1602  **/
1603 static int sd_done(struct scsi_cmnd *SCpnt)
1604 {
1605         int result = SCpnt->result;
1606         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1607         struct scsi_sense_hdr sshdr;
1608         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1609         struct request *req = SCpnt->request;
1610         int sense_valid = 0;
1611         int sense_deferred = 0;
1612         unsigned char op = SCpnt->cmnd[0];
1613         unsigned char unmap = SCpnt->cmnd[1] & 8;
1614
1615         if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1616                 if (!result) {
1617                         good_bytes = blk_rq_bytes(req);
1618                         scsi_set_resid(SCpnt, 0);
1619                 } else {
1620                         good_bytes = 0;
1621                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1622                 }
1623         }
1624
1625         if (result) {
1626                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1627                 if (sense_valid)
1628                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1629         }
1630 #ifdef CONFIG_SCSI_LOGGING
1631         SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1632         if (sense_valid) {
1633                 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1634                                                    "sd_done: sb[respc,sk,asc,"
1635                                                    "ascq]=%x,%x,%x,%x\n",
1636                                                    sshdr.response_code,
1637                                                    sshdr.sense_key, sshdr.asc,
1638                                                    sshdr.ascq));
1639         }
1640 #endif
1641         if (driver_byte(result) != DRIVER_SENSE &&
1642             (!sense_valid || sense_deferred))
1643                 goto out;
1644
1645         sdkp->medium_access_timed_out = 0;
1646
1647         switch (sshdr.sense_key) {
1648         case HARDWARE_ERROR:
1649         case MEDIUM_ERROR:
1650                 good_bytes = sd_completed_bytes(SCpnt);
1651                 break;
1652         case RECOVERED_ERROR:
1653                 good_bytes = scsi_bufflen(SCpnt);
1654                 break;
1655         case NO_SENSE:
1656                 /* This indicates a false check condition, so ignore it.  An
1657                  * unknown amount of data was transferred so treat it as an
1658                  * error.
1659                  */
1660                 scsi_print_sense("sd", SCpnt);
1661                 SCpnt->result = 0;
1662                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1663                 break;
1664         case ABORTED_COMMAND:
1665                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1666                         good_bytes = sd_completed_bytes(SCpnt);
1667                 break;
1668         case ILLEGAL_REQUEST:
1669                 if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1670                         good_bytes = sd_completed_bytes(SCpnt);
1671                 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1672                 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1673                         switch (op) {
1674                         case UNMAP:
1675                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
1676                                 break;
1677                         case WRITE_SAME_16:
1678                         case WRITE_SAME:
1679                                 if (unmap)
1680                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
1681                                 else {
1682                                         sdkp->device->no_write_same = 1;
1683                                         sd_config_write_same(sdkp);
1684
1685                                         good_bytes = 0;
1686                                         req->__data_len = blk_rq_bytes(req);
1687                                         req->cmd_flags |= REQ_QUIET;
1688                                 }
1689                         }
1690                 }
1691                 break;
1692         default:
1693                 break;
1694         }
1695  out:
1696         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1697                 sd_dif_complete(SCpnt, good_bytes);
1698
1699         if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1700             == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1701
1702                 /* We have to print a failed command here as the
1703                  * extended CDB gets freed before scsi_io_completion()
1704                  * is called.
1705                  */
1706                 if (result)
1707                         scsi_print_command(SCpnt);
1708
1709                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1710                 SCpnt->cmnd = NULL;
1711                 SCpnt->cmd_len = 0;
1712         }
1713
1714         return good_bytes;
1715 }
1716
1717 /*
1718  * spinup disk - called only in sd_revalidate_disk()
1719  */
1720 static void
1721 sd_spinup_disk(struct scsi_disk *sdkp)
1722 {
1723         unsigned char cmd[10];
1724         unsigned long spintime_expire = 0;
1725         int retries, spintime;
1726         unsigned int the_result;
1727         struct scsi_sense_hdr sshdr;
1728         int sense_valid = 0;
1729
1730         spintime = 0;
1731
1732         /* Spin up drives, as required.  Only do this at boot time */
1733         /* Spinup needs to be done for module loads too. */
1734         do {
1735                 retries = 0;
1736
1737                 do {
1738                         cmd[0] = TEST_UNIT_READY;
1739                         memset((void *) &cmd[1], 0, 9);
1740
1741                         the_result = scsi_execute_req(sdkp->device, cmd,
1742                                                       DMA_NONE, NULL, 0,
1743                                                       &sshdr, SD_TIMEOUT,
1744                                                       SD_MAX_RETRIES, NULL);
1745
1746                         /*
1747                          * If the drive has indicated to us that it
1748                          * doesn't have any media in it, don't bother
1749                          * with any more polling.
1750                          */
1751                         if (media_not_present(sdkp, &sshdr))
1752                                 return;
1753
1754                         if (the_result)
1755                                 sense_valid = scsi_sense_valid(&sshdr);
1756                         retries++;
1757                 } while (retries < 3 && 
1758                          (!scsi_status_is_good(the_result) ||
1759                           ((driver_byte(the_result) & DRIVER_SENSE) &&
1760                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1761
1762                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1763                         /* no sense, TUR either succeeded or failed
1764                          * with a status error */
1765                         if(!spintime && !scsi_status_is_good(the_result)) {
1766                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1767                                 sd_print_result(sdkp, the_result);
1768                         }
1769                         break;
1770                 }
1771                                         
1772                 /*
1773                  * The device does not want the automatic start to be issued.
1774                  */
1775                 if (sdkp->device->no_start_on_add)
1776                         break;
1777
1778                 if (sense_valid && sshdr.sense_key == NOT_READY) {
1779                         if (sshdr.asc == 4 && sshdr.ascq == 3)
1780                                 break;  /* manual intervention required */
1781                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1782                                 break;  /* standby */
1783                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1784                                 break;  /* unavailable */
1785                         /*
1786                          * Issue command to spin up drive when not ready
1787                          */
1788                         if (!spintime) {
1789                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1790                                 cmd[0] = START_STOP;
1791                                 cmd[1] = 1;     /* Return immediately */
1792                                 memset((void *) &cmd[2], 0, 8);
1793                                 cmd[4] = 1;     /* Start spin cycle */
1794                                 if (sdkp->device->start_stop_pwr_cond)
1795                                         cmd[4] |= 1 << 4;
1796                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1797                                                  NULL, 0, &sshdr,
1798                                                  SD_TIMEOUT, SD_MAX_RETRIES,
1799                                                  NULL);
1800                                 spintime_expire = jiffies + 100 * HZ;
1801                                 spintime = 1;
1802                         }
1803                         /* Wait 1 second for next try */
1804                         msleep(1000);
1805                         printk(".");
1806
1807                 /*
1808                  * Wait for USB flash devices with slow firmware.
1809                  * Yes, this sense key/ASC combination shouldn't
1810                  * occur here.  It's characteristic of these devices.
1811                  */
1812                 } else if (sense_valid &&
1813                                 sshdr.sense_key == UNIT_ATTENTION &&
1814                                 sshdr.asc == 0x28) {
1815                         if (!spintime) {
1816                                 spintime_expire = jiffies + 5 * HZ;
1817                                 spintime = 1;
1818                         }
1819                         /* Wait 1 second for next try */
1820                         msleep(1000);
1821                 } else {
1822                         /* we don't understand the sense code, so it's
1823                          * probably pointless to loop */
1824                         if(!spintime) {
1825                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1826                                 sd_print_sense_hdr(sdkp, &sshdr);
1827                         }
1828                         break;
1829                 }
1830                                 
1831         } while (spintime && time_before_eq(jiffies, spintime_expire));
1832
1833         if (spintime) {
1834                 if (scsi_status_is_good(the_result))
1835                         printk("ready\n");
1836                 else
1837                         printk("not responding...\n");
1838         }
1839 }
1840
1841
1842 /*
1843  * Determine whether disk supports Data Integrity Field.
1844  */
1845 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1846 {
1847         struct scsi_device *sdp = sdkp->device;
1848         u8 type;
1849         int ret = 0;
1850
1851         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1852                 return ret;
1853
1854         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1855
1856         if (type > SD_DIF_TYPE3_PROTECTION)
1857                 ret = -ENODEV;
1858         else if (scsi_host_dif_capable(sdp->host, type))
1859                 ret = 1;
1860
1861         if (sdkp->first_scan || type != sdkp->protection_type)
1862                 switch (ret) {
1863                 case -ENODEV:
1864                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1865                                   " protection type %u. Disabling disk!\n",
1866                                   type);
1867                         break;
1868                 case 1:
1869                         sd_printk(KERN_NOTICE, sdkp,
1870                                   "Enabling DIF Type %u protection\n", type);
1871                         break;
1872                 case 0:
1873                         sd_printk(KERN_NOTICE, sdkp,
1874                                   "Disabling DIF Type %u protection\n", type);
1875                         break;
1876                 }
1877
1878         sdkp->protection_type = type;
1879
1880         return ret;
1881 }
1882
1883 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1884                         struct scsi_sense_hdr *sshdr, int sense_valid,
1885                         int the_result)
1886 {
1887         sd_print_result(sdkp, the_result);
1888         if (driver_byte(the_result) & DRIVER_SENSE)
1889                 sd_print_sense_hdr(sdkp, sshdr);
1890         else
1891                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1892
1893         /*
1894          * Set dirty bit for removable devices if not ready -
1895          * sometimes drives will not report this properly.
1896          */
1897         if (sdp->removable &&
1898             sense_valid && sshdr->sense_key == NOT_READY)
1899                 set_media_not_present(sdkp);
1900
1901         /*
1902          * We used to set media_present to 0 here to indicate no media
1903          * in the drive, but some drives fail read capacity even with
1904          * media present, so we can't do that.
1905          */
1906         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1907 }
1908
1909 #define RC16_LEN 32
1910 #if RC16_LEN > SD_BUF_SIZE
1911 #error RC16_LEN must not be more than SD_BUF_SIZE
1912 #endif
1913
1914 #define READ_CAPACITY_RETRIES_ON_RESET  10
1915
1916 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1917                                                 unsigned char *buffer)
1918 {
1919         unsigned char cmd[16];
1920         struct scsi_sense_hdr sshdr;
1921         int sense_valid = 0;
1922         int the_result;
1923         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1924         unsigned int alignment;
1925         unsigned long long lba;
1926         unsigned sector_size;
1927
1928         if (sdp->no_read_capacity_16)
1929                 return -EINVAL;
1930
1931         do {
1932                 memset(cmd, 0, 16);
1933                 cmd[0] = SERVICE_ACTION_IN;
1934                 cmd[1] = SAI_READ_CAPACITY_16;
1935                 cmd[13] = RC16_LEN;
1936                 memset(buffer, 0, RC16_LEN);
1937
1938                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1939                                         buffer, RC16_LEN, &sshdr,
1940                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1941
1942                 if (media_not_present(sdkp, &sshdr))
1943                         return -ENODEV;
1944
1945                 if (the_result) {
1946                         sense_valid = scsi_sense_valid(&sshdr);
1947                         if (sense_valid &&
1948                             sshdr.sense_key == ILLEGAL_REQUEST &&
1949                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1950                             sshdr.ascq == 0x00)
1951                                 /* Invalid Command Operation Code or
1952                                  * Invalid Field in CDB, just retry
1953                                  * silently with RC10 */
1954                                 return -EINVAL;
1955                         if (sense_valid &&
1956                             sshdr.sense_key == UNIT_ATTENTION &&
1957                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1958                                 /* Device reset might occur several times,
1959                                  * give it one more chance */
1960                                 if (--reset_retries > 0)
1961                                         continue;
1962                 }
1963                 retries--;
1964
1965         } while (the_result && retries);
1966
1967         if (the_result) {
1968                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1969                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1970                 return -EINVAL;
1971         }
1972
1973         sector_size = get_unaligned_be32(&buffer[8]);
1974         lba = get_unaligned_be64(&buffer[0]);
1975
1976         if (sd_read_protection_type(sdkp, buffer) < 0) {
1977                 sdkp->capacity = 0;
1978                 return -ENODEV;
1979         }
1980
1981         if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1982                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1983                         "kernel compiled with support for large block "
1984                         "devices.\n");
1985                 sdkp->capacity = 0;
1986                 return -EOVERFLOW;
1987         }
1988
1989         /* Logical blocks per physical block exponent */
1990         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1991
1992         /* Lowest aligned logical block */
1993         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1994         blk_queue_alignment_offset(sdp->request_queue, alignment);
1995         if (alignment && sdkp->first_scan)
1996                 sd_printk(KERN_NOTICE, sdkp,
1997                           "physical block alignment offset: %u\n", alignment);
1998
1999         if (buffer[14] & 0x80) { /* LBPME */
2000                 sdkp->lbpme = 1;
2001
2002                 if (buffer[14] & 0x40) /* LBPRZ */
2003                         sdkp->lbprz = 1;
2004
2005                 sd_config_discard(sdkp, SD_LBP_WS16);
2006         }
2007
2008         sdkp->capacity = lba + 1;
2009         return sector_size;
2010 }
2011
2012 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2013                                                 unsigned char *buffer)
2014 {
2015         unsigned char cmd[16];
2016         struct scsi_sense_hdr sshdr;
2017         int sense_valid = 0;
2018         int the_result;
2019         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2020         sector_t lba;
2021         unsigned sector_size;
2022
2023         do {
2024                 cmd[0] = READ_CAPACITY;
2025                 memset(&cmd[1], 0, 9);
2026                 memset(buffer, 0, 8);
2027
2028                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2029                                         buffer, 8, &sshdr,
2030                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2031
2032                 if (media_not_present(sdkp, &sshdr))
2033                         return -ENODEV;
2034
2035                 if (the_result) {
2036                         sense_valid = scsi_sense_valid(&sshdr);
2037                         if (sense_valid &&
2038                             sshdr.sense_key == UNIT_ATTENTION &&
2039                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2040                                 /* Device reset might occur several times,
2041                                  * give it one more chance */
2042                                 if (--reset_retries > 0)
2043                                         continue;
2044                 }
2045                 retries--;
2046
2047         } while (the_result && retries);
2048
2049         if (the_result) {
2050                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2051                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2052                 return -EINVAL;
2053         }
2054
2055         sector_size = get_unaligned_be32(&buffer[4]);
2056         lba = get_unaligned_be32(&buffer[0]);
2057
2058         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2059                 /* Some buggy (usb cardreader) devices return an lba of
2060                    0xffffffff when the want to report a size of 0 (with
2061                    which they really mean no media is present) */
2062                 sdkp->capacity = 0;
2063                 sdkp->physical_block_size = sector_size;
2064                 return sector_size;
2065         }
2066
2067         if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2068                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2069                         "kernel compiled with support for large block "
2070                         "devices.\n");
2071                 sdkp->capacity = 0;
2072                 return -EOVERFLOW;
2073         }
2074
2075         sdkp->capacity = lba + 1;
2076         sdkp->physical_block_size = sector_size;
2077         return sector_size;
2078 }
2079
2080 static int sd_try_rc16_first(struct scsi_device *sdp)
2081 {
2082         if (sdp->host->max_cmd_len < 16)
2083                 return 0;
2084         if (sdp->try_rc_10_first)
2085                 return 0;
2086         if (sdp->scsi_level > SCSI_SPC_2)
2087                 return 1;
2088         if (scsi_device_protection(sdp))
2089                 return 1;
2090         return 0;
2091 }
2092
2093 /*
2094  * read disk capacity
2095  */
2096 static void
2097 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2098 {
2099         int sector_size;
2100         struct scsi_device *sdp = sdkp->device;
2101         sector_t old_capacity = sdkp->capacity;
2102
2103         if (sd_try_rc16_first(sdp)) {
2104                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2105                 if (sector_size == -EOVERFLOW)
2106                         goto got_data;
2107                 if (sector_size == -ENODEV)
2108                         return;
2109                 if (sector_size < 0)
2110                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2111                 if (sector_size < 0)
2112                         return;
2113         } else {
2114                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2115                 if (sector_size == -EOVERFLOW)
2116                         goto got_data;
2117                 if (sector_size < 0)
2118                         return;
2119                 if ((sizeof(sdkp->capacity) > 4) &&
2120                     (sdkp->capacity > 0xffffffffULL)) {
2121                         int old_sector_size = sector_size;
2122                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2123                                         "Trying to use READ CAPACITY(16).\n");
2124                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2125                         if (sector_size < 0) {
2126                                 sd_printk(KERN_NOTICE, sdkp,
2127                                         "Using 0xffffffff as device size\n");
2128                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2129                                 sector_size = old_sector_size;
2130                                 goto got_data;
2131                         }
2132                 }
2133         }
2134
2135         /* Some devices are known to return the total number of blocks,
2136          * not the highest block number.  Some devices have versions
2137          * which do this and others which do not.  Some devices we might
2138          * suspect of doing this but we don't know for certain.
2139          *
2140          * If we know the reported capacity is wrong, decrement it.  If
2141          * we can only guess, then assume the number of blocks is even
2142          * (usually true but not always) and err on the side of lowering
2143          * the capacity.
2144          */
2145         if (sdp->fix_capacity ||
2146             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2147                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2148                                 "from its reported value: %llu\n",
2149                                 (unsigned long long) sdkp->capacity);
2150                 --sdkp->capacity;
2151         }
2152
2153 got_data:
2154         if (sector_size == 0) {
2155                 sector_size = 512;
2156                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2157                           "assuming 512.\n");
2158         }
2159
2160         if (sector_size != 512 &&
2161             sector_size != 1024 &&
2162             sector_size != 2048 &&
2163             sector_size != 4096 &&
2164             sector_size != 256) {
2165                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2166                           sector_size);
2167                 /*
2168                  * The user might want to re-format the drive with
2169                  * a supported sectorsize.  Once this happens, it
2170                  * would be relatively trivial to set the thing up.
2171                  * For this reason, we leave the thing in the table.
2172                  */
2173                 sdkp->capacity = 0;
2174                 /*
2175                  * set a bogus sector size so the normal read/write
2176                  * logic in the block layer will eventually refuse any
2177                  * request on this device without tripping over power
2178                  * of two sector size assumptions
2179                  */
2180                 sector_size = 512;
2181         }
2182         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2183
2184         {
2185                 char cap_str_2[10], cap_str_10[10];
2186                 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2187
2188                 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2189                                 sizeof(cap_str_2));
2190                 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2191                                 sizeof(cap_str_10));
2192
2193                 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2194                         sd_printk(KERN_NOTICE, sdkp,
2195                                   "%llu %d-byte logical blocks: (%s/%s)\n",
2196                                   (unsigned long long)sdkp->capacity,
2197                                   sector_size, cap_str_10, cap_str_2);
2198
2199                         if (sdkp->physical_block_size != sector_size)
2200                                 sd_printk(KERN_NOTICE, sdkp,
2201                                           "%u-byte physical blocks\n",
2202                                           sdkp->physical_block_size);
2203                 }
2204         }
2205
2206         /* Rescale capacity to 512-byte units */
2207         if (sector_size == 4096)
2208                 sdkp->capacity <<= 3;
2209         else if (sector_size == 2048)
2210                 sdkp->capacity <<= 2;
2211         else if (sector_size == 1024)
2212                 sdkp->capacity <<= 1;
2213         else if (sector_size == 256)
2214                 sdkp->capacity >>= 1;
2215
2216         blk_queue_physical_block_size(sdp->request_queue,
2217                                       sdkp->physical_block_size);
2218         sdkp->device->sector_size = sector_size;
2219 }
2220
2221 /* called with buffer of length 512 */
2222 static inline int
2223 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2224                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2225                  struct scsi_sense_hdr *sshdr)
2226 {
2227         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2228                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2229                                sshdr);
2230 }
2231
2232 /*
2233  * read write protect setting, if possible - called only in sd_revalidate_disk()
2234  * called with buffer of length SD_BUF_SIZE
2235  */
2236 static void
2237 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2238 {
2239         int res;
2240         struct scsi_device *sdp = sdkp->device;
2241         struct scsi_mode_data data;
2242         int old_wp = sdkp->write_prot;
2243
2244         set_disk_ro(sdkp->disk, 0);
2245         if (sdp->skip_ms_page_3f) {
2246                 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2247                 return;
2248         }
2249
2250         if (sdp->use_192_bytes_for_3f) {
2251                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2252         } else {
2253                 /*
2254                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2255                  * We have to start carefully: some devices hang if we ask
2256                  * for more than is available.
2257                  */
2258                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2259
2260                 /*
2261                  * Second attempt: ask for page 0 When only page 0 is
2262                  * implemented, a request for page 3F may return Sense Key
2263                  * 5: Illegal Request, Sense Code 24: Invalid field in
2264                  * CDB.
2265                  */
2266                 if (!scsi_status_is_good(res))
2267                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2268
2269                 /*
2270                  * Third attempt: ask 255 bytes, as we did earlier.
2271                  */
2272                 if (!scsi_status_is_good(res))
2273                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2274                                                &data, NULL);
2275         }
2276
2277         if (!scsi_status_is_good(res)) {
2278                 sd_printk(KERN_WARNING, sdkp,
2279                           "Test WP failed, assume Write Enabled\n");
2280         } else {
2281                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2282                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2283                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2284                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2285                                   sdkp->write_prot ? "on" : "off");
2286                         sd_printk(KERN_DEBUG, sdkp,
2287                                   "Mode Sense: %02x %02x %02x %02x\n",
2288                                   buffer[0], buffer[1], buffer[2], buffer[3]);
2289                 }
2290         }
2291 }
2292
2293 /*
2294  * sd_read_cache_type - called only from sd_revalidate_disk()
2295  * called with buffer of length SD_BUF_SIZE
2296  */
2297 static void
2298 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2299 {
2300         int len = 0, res;
2301         struct scsi_device *sdp = sdkp->device;
2302
2303         int dbd;
2304         int modepage;
2305         int first_len;
2306         struct scsi_mode_data data;
2307         struct scsi_sense_hdr sshdr;
2308         int old_wce = sdkp->WCE;
2309         int old_rcd = sdkp->RCD;
2310         int old_dpofua = sdkp->DPOFUA;
2311
2312         first_len = 4;
2313         if (sdp->skip_ms_page_8) {
2314                 if (sdp->type == TYPE_RBC)
2315                         goto defaults;
2316                 else {
2317                         if (sdp->skip_ms_page_3f)
2318                                 goto defaults;
2319                         modepage = 0x3F;
2320                         if (sdp->use_192_bytes_for_3f)
2321                                 first_len = 192;
2322                         dbd = 0;
2323                 }
2324         } else if (sdp->type == TYPE_RBC) {
2325                 modepage = 6;
2326                 dbd = 8;
2327         } else {
2328                 modepage = 8;
2329                 dbd = 0;
2330         }
2331
2332         /* cautiously ask */
2333         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2334                         &data, &sshdr);
2335
2336         if (!scsi_status_is_good(res))
2337                 goto bad_sense;
2338
2339         if (!data.header_length) {
2340                 modepage = 6;
2341                 first_len = 0;
2342                 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2343         }
2344
2345         /* that went OK, now ask for the proper length */
2346         len = data.length;
2347
2348         /*
2349          * We're only interested in the first three bytes, actually.
2350          * But the data cache page is defined for the first 20.
2351          */
2352         if (len < 3)
2353                 goto bad_sense;
2354         else if (len > SD_BUF_SIZE) {
2355                 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2356                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2357                 len = SD_BUF_SIZE;
2358         }
2359         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2360                 len = 192;
2361
2362         /* Get the data */
2363         if (len > first_len)
2364                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2365                                 &data, &sshdr);
2366
2367         if (scsi_status_is_good(res)) {
2368                 int offset = data.header_length + data.block_descriptor_length;
2369
2370                 while (offset < len) {
2371                         u8 page_code = buffer[offset] & 0x3F;
2372                         u8 spf       = buffer[offset] & 0x40;
2373
2374                         if (page_code == 8 || page_code == 6) {
2375                                 /* We're interested only in the first 3 bytes.
2376                                  */
2377                                 if (len - offset <= 2) {
2378                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2379                                                   "mode parameter data\n");
2380                                         goto defaults;
2381                                 } else {
2382                                         modepage = page_code;
2383                                         goto Page_found;
2384                                 }
2385                         } else {
2386                                 /* Go to the next page */
2387                                 if (spf && len - offset > 3)
2388                                         offset += 4 + (buffer[offset+2] << 8) +
2389                                                 buffer[offset+3];
2390                                 else if (!spf && len - offset > 1)
2391                                         offset += 2 + buffer[offset+1];
2392                                 else {
2393                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2394                                                   "mode parameter data\n");
2395                                         goto defaults;
2396                                 }
2397                         }
2398                 }
2399
2400                 if (modepage == 0x3F) {
2401                         sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2402                                   "present\n");
2403                         goto defaults;
2404                 } else if ((buffer[offset] & 0x3f) != modepage) {
2405                         sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2406                         goto defaults;
2407                 }
2408         Page_found:
2409                 if (modepage == 8) {
2410                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2411                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2412                 } else {
2413                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2414                         sdkp->RCD = 0;
2415                 }
2416
2417                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2418                 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2419                         sd_printk(KERN_NOTICE, sdkp,
2420                                   "Uses READ/WRITE(6), disabling FUA\n");
2421                         sdkp->DPOFUA = 0;
2422                 }
2423
2424                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2425                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2426                         sd_printk(KERN_NOTICE, sdkp,
2427                                   "Write cache: %s, read cache: %s, %s\n",
2428                                   sdkp->WCE ? "enabled" : "disabled",
2429                                   sdkp->RCD ? "disabled" : "enabled",
2430                                   sdkp->DPOFUA ? "supports DPO and FUA"
2431                                   : "doesn't support DPO or FUA");
2432
2433                 return;
2434         }
2435
2436 bad_sense:
2437         if (scsi_sense_valid(&sshdr) &&
2438             sshdr.sense_key == ILLEGAL_REQUEST &&
2439             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2440                 /* Invalid field in CDB */
2441                 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2442         else
2443                 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2444
2445 defaults:
2446         if (sdp->wce_default_on) {
2447                 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2448                 sdkp->WCE = 1;
2449         } else {
2450                 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2451                 sdkp->WCE = 0;
2452         }
2453         sdkp->RCD = 0;
2454         sdkp->DPOFUA = 0;
2455 }
2456
2457 /*
2458  * The ATO bit indicates whether the DIF application tag is available
2459  * for use by the operating system.
2460  */
2461 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2462 {
2463         int res, offset;
2464         struct scsi_device *sdp = sdkp->device;
2465         struct scsi_mode_data data;
2466         struct scsi_sense_hdr sshdr;
2467
2468         if (sdp->type != TYPE_DISK)
2469                 return;
2470
2471         if (sdkp->protection_type == 0)
2472                 return;
2473
2474         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2475                               SD_MAX_RETRIES, &data, &sshdr);
2476
2477         if (!scsi_status_is_good(res) || !data.header_length ||
2478             data.length < 6) {
2479                 sd_printk(KERN_WARNING, sdkp,
2480                           "getting Control mode page failed, assume no ATO\n");
2481
2482                 if (scsi_sense_valid(&sshdr))
2483                         sd_print_sense_hdr(sdkp, &sshdr);
2484
2485                 return;
2486         }
2487
2488         offset = data.header_length + data.block_descriptor_length;
2489
2490         if ((buffer[offset] & 0x3f) != 0x0a) {
2491                 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2492                 return;
2493         }
2494
2495         if ((buffer[offset + 5] & 0x80) == 0)
2496                 return;
2497
2498         sdkp->ATO = 1;
2499
2500         return;
2501 }
2502
2503 /**
2504  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2505  * @disk: disk to query
2506  */
2507 static void sd_read_block_limits(struct scsi_disk *sdkp)
2508 {
2509         unsigned int sector_sz = sdkp->device->sector_size;
2510         const int vpd_len = 64;
2511         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2512
2513         if (!buffer ||
2514             /* Block Limits VPD */
2515             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2516                 goto out;
2517
2518         blk_queue_io_min(sdkp->disk->queue,
2519                          get_unaligned_be16(&buffer[6]) * sector_sz);
2520         blk_queue_io_opt(sdkp->disk->queue,
2521                          get_unaligned_be32(&buffer[12]) * sector_sz);
2522
2523         if (buffer[3] == 0x3c) {
2524                 unsigned int lba_count, desc_count;
2525
2526                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2527
2528                 if (!sdkp->lbpme)
2529                         goto out;
2530
2531                 lba_count = get_unaligned_be32(&buffer[20]);
2532                 desc_count = get_unaligned_be32(&buffer[24]);
2533
2534                 if (lba_count && desc_count)
2535                         sdkp->max_unmap_blocks = lba_count;
2536
2537                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2538
2539                 if (buffer[32] & 0x80)
2540                         sdkp->unmap_alignment =
2541                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2542
2543                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2544
2545                         if (sdkp->max_unmap_blocks)
2546                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2547                         else
2548                                 sd_config_discard(sdkp, SD_LBP_WS16);
2549
2550                 } else {        /* LBP VPD page tells us what to use */
2551
2552                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2553                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2554                         else if (sdkp->lbpws)
2555                                 sd_config_discard(sdkp, SD_LBP_WS16);
2556                         else if (sdkp->lbpws10)
2557                                 sd_config_discard(sdkp, SD_LBP_WS10);
2558                         else
2559                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2560                 }
2561         }
2562
2563  out:
2564         kfree(buffer);
2565 }
2566
2567 /**
2568  * sd_read_block_characteristics - Query block dev. characteristics
2569  * @disk: disk to query
2570  */
2571 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2572 {
2573         unsigned char *buffer;
2574         u16 rot;
2575         const int vpd_len = 64;
2576
2577         buffer = kmalloc(vpd_len, GFP_KERNEL);
2578
2579         if (!buffer ||
2580             /* Block Device Characteristics VPD */
2581             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2582                 goto out;
2583
2584         rot = get_unaligned_be16(&buffer[4]);
2585
2586         if (rot == 1)
2587                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2588
2589  out:
2590         kfree(buffer);
2591 }
2592
2593 /**
2594  * sd_read_block_provisioning - Query provisioning VPD page
2595  * @disk: disk to query
2596  */
2597 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2598 {
2599         unsigned char *buffer;
2600         const int vpd_len = 8;
2601
2602         if (sdkp->lbpme == 0)
2603                 return;
2604
2605         buffer = kmalloc(vpd_len, GFP_KERNEL);
2606
2607         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2608                 goto out;
2609
2610         sdkp->lbpvpd    = 1;
2611         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2612         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2613         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2614
2615  out:
2616         kfree(buffer);
2617 }
2618
2619 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2620 {
2621         if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2622                                WRITE_SAME_16))
2623                 sdkp->ws16 = 1;
2624 }
2625
2626 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2627 {
2628         /*
2629          * Although VPD inquiries can go to SCSI-2 type devices,
2630          * some USB ones crash on receiving them, and the pages
2631          * we currently ask for are for SPC-3 and beyond
2632          */
2633         if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2634                 return 1;
2635         return 0;
2636 }
2637
2638 /**
2639  *      sd_revalidate_disk - called the first time a new disk is seen,
2640  *      performs disk spin up, read_capacity, etc.
2641  *      @disk: struct gendisk we care about
2642  **/
2643 static int sd_revalidate_disk(struct gendisk *disk)
2644 {
2645         struct scsi_disk *sdkp = scsi_disk(disk);
2646         struct scsi_device *sdp = sdkp->device;
2647         unsigned char *buffer;
2648         unsigned flush = 0;
2649
2650         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2651                                       "sd_revalidate_disk\n"));
2652
2653         /*
2654          * If the device is offline, don't try and read capacity or any
2655          * of the other niceties.
2656          */
2657         if (!scsi_device_online(sdp))
2658                 goto out;
2659
2660         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2661         if (!buffer) {
2662                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2663                           "allocation failure.\n");
2664                 goto out;
2665         }
2666
2667         sd_spinup_disk(sdkp);
2668
2669         /*
2670          * Without media there is no reason to ask; moreover, some devices
2671          * react badly if we do.
2672          */
2673         if (sdkp->media_present) {
2674                 sd_read_capacity(sdkp, buffer);
2675
2676                 if (sd_try_extended_inquiry(sdp)) {
2677                         sd_read_block_provisioning(sdkp);
2678                         sd_read_block_limits(sdkp);
2679                         sd_read_block_characteristics(sdkp);
2680                 }
2681
2682                 sd_read_write_protect_flag(sdkp, buffer);
2683                 sd_read_cache_type(sdkp, buffer);
2684                 sd_read_app_tag_own(sdkp, buffer);
2685                 sd_read_write_same(sdkp, buffer);
2686         }
2687
2688         sdkp->first_scan = 0;
2689
2690         /*
2691          * We now have all cache related info, determine how we deal
2692          * with flush requests.
2693          */
2694         if (sdkp->WCE) {
2695                 flush |= REQ_FLUSH;
2696                 if (sdkp->DPOFUA)
2697                         flush |= REQ_FUA;
2698         }
2699
2700         blk_queue_flush(sdkp->disk->queue, flush);
2701
2702         set_capacity(disk, sdkp->capacity);
2703         sd_config_write_same(sdkp);
2704         kfree(buffer);
2705
2706  out:
2707         return 0;
2708 }
2709
2710 /**
2711  *      sd_unlock_native_capacity - unlock native capacity
2712  *      @disk: struct gendisk to set capacity for
2713  *
2714  *      Block layer calls this function if it detects that partitions
2715  *      on @disk reach beyond the end of the device.  If the SCSI host
2716  *      implements ->unlock_native_capacity() method, it's invoked to
2717  *      give it a chance to adjust the device capacity.
2718  *
2719  *      CONTEXT:
2720  *      Defined by block layer.  Might sleep.
2721  */
2722 static void sd_unlock_native_capacity(struct gendisk *disk)
2723 {
2724         struct scsi_device *sdev = scsi_disk(disk)->device;
2725
2726         if (sdev->host->hostt->unlock_native_capacity)
2727                 sdev->host->hostt->unlock_native_capacity(sdev);
2728 }
2729
2730 /**
2731  *      sd_format_disk_name - format disk name
2732  *      @prefix: name prefix - ie. "sd" for SCSI disks
2733  *      @index: index of the disk to format name for
2734  *      @buf: output buffer
2735  *      @buflen: length of the output buffer
2736  *
2737  *      SCSI disk names starts at sda.  The 26th device is sdz and the
2738  *      27th is sdaa.  The last one for two lettered suffix is sdzz
2739  *      which is followed by sdaaa.
2740  *
2741  *      This is basically 26 base counting with one extra 'nil' entry
2742  *      at the beginning from the second digit on and can be
2743  *      determined using similar method as 26 base conversion with the
2744  *      index shifted -1 after each digit is computed.
2745  *
2746  *      CONTEXT:
2747  *      Don't care.
2748  *
2749  *      RETURNS:
2750  *      0 on success, -errno on failure.
2751  */
2752 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2753 {
2754         const int base = 'z' - 'a' + 1;
2755         char *begin = buf + strlen(prefix);
2756         char *end = buf + buflen;
2757         char *p;
2758         int unit;
2759
2760         p = end - 1;
2761         *p = '\0';
2762         unit = base;
2763         do {
2764                 if (p == begin)
2765                         return -EINVAL;
2766                 *--p = 'a' + (index % unit);
2767                 index = (index / unit) - 1;
2768         } while (index >= 0);
2769
2770         memmove(begin, p, end - p);
2771         memcpy(buf, prefix, strlen(prefix));
2772
2773         return 0;
2774 }
2775
2776 /*
2777  * The asynchronous part of sd_probe
2778  */
2779 static void sd_probe_async(void *data, async_cookie_t cookie)
2780 {
2781         struct scsi_disk *sdkp = data;
2782         struct scsi_device *sdp;
2783         struct gendisk *gd;
2784         u32 index;
2785         struct device *dev;
2786
2787         sdp = sdkp->device;
2788         gd = sdkp->disk;
2789         index = sdkp->index;
2790         dev = &sdp->sdev_gendev;
2791
2792         gd->major = sd_major((index & 0xf0) >> 4);
2793         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2794         gd->minors = SD_MINORS;
2795
2796         gd->fops = &sd_fops;
2797         gd->private_data = &sdkp->driver;
2798         gd->queue = sdkp->device->request_queue;
2799
2800         /* defaults, until the device tells us otherwise */
2801         sdp->sector_size = 512;
2802         sdkp->capacity = 0;
2803         sdkp->media_present = 1;
2804         sdkp->write_prot = 0;
2805         sdkp->WCE = 0;
2806         sdkp->RCD = 0;
2807         sdkp->ATO = 0;
2808         sdkp->first_scan = 1;
2809         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2810
2811         sd_revalidate_disk(gd);
2812
2813         blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2814         blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2815
2816         gd->driverfs_dev = &sdp->sdev_gendev;
2817         gd->flags = GENHD_FL_EXT_DEVT;
2818         if (sdp->removable) {
2819                 gd->flags |= GENHD_FL_REMOVABLE;
2820                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2821         }
2822
2823         add_disk(gd);
2824         if (sdkp->capacity)
2825                 sd_dif_config_host(sdkp);
2826
2827         sd_revalidate_disk(gd);
2828
2829         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2830                   sdp->removable ? "removable " : "");
2831         scsi_autopm_put_device(sdp);
2832         put_device(&sdkp->dev);
2833 }
2834
2835 /**
2836  *      sd_probe - called during driver initialization and whenever a
2837  *      new scsi device is attached to the system. It is called once
2838  *      for each scsi device (not just disks) present.
2839  *      @dev: pointer to device object
2840  *
2841  *      Returns 0 if successful (or not interested in this scsi device 
2842  *      (e.g. scanner)); 1 when there is an error.
2843  *
2844  *      Note: this function is invoked from the scsi mid-level.
2845  *      This function sets up the mapping between a given 
2846  *      <host,channel,id,lun> (found in sdp) and new device name 
2847  *      (e.g. /dev/sda). More precisely it is the block device major 
2848  *      and minor number that is chosen here.
2849  *
2850  *      Assume sd_probe is not re-entrant (for time being)
2851  *      Also think about sd_probe() and sd_remove() running coincidentally.
2852  **/
2853 static int sd_probe(struct device *dev)
2854 {
2855         struct scsi_device *sdp = to_scsi_device(dev);
2856         struct scsi_disk *sdkp;
2857         struct gendisk *gd;
2858         int index;
2859         int error;
2860
2861         error = -ENODEV;
2862         if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2863                 goto out;
2864
2865         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2866                                         "sd_probe\n"));
2867
2868         error = -ENOMEM;
2869         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2870         if (!sdkp)
2871                 goto out;
2872
2873         gd = alloc_disk(SD_MINORS);
2874         if (!gd)
2875                 goto out_free;
2876
2877         do {
2878                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2879                         goto out_put;
2880
2881                 spin_lock(&sd_index_lock);
2882                 error = ida_get_new(&sd_index_ida, &index);
2883                 spin_unlock(&sd_index_lock);
2884         } while (error == -EAGAIN);
2885
2886         if (error) {
2887                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2888                 goto out_put;
2889         }
2890
2891         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2892         if (error) {
2893                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2894                 goto out_free_index;
2895         }
2896
2897         sdkp->device = sdp;
2898         sdkp->driver = &sd_template;
2899         sdkp->disk = gd;
2900         sdkp->index = index;
2901         atomic_set(&sdkp->openers, 0);
2902         atomic_set(&sdkp->device->ioerr_cnt, 0);
2903
2904         if (!sdp->request_queue->rq_timeout) {
2905                 if (sdp->type != TYPE_MOD)
2906                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2907                 else
2908                         blk_queue_rq_timeout(sdp->request_queue,
2909                                              SD_MOD_TIMEOUT);
2910         }
2911
2912         device_initialize(&sdkp->dev);
2913         sdkp->dev.parent = dev;
2914         sdkp->dev.class = &sd_disk_class;
2915         dev_set_name(&sdkp->dev, dev_name(dev));
2916
2917         if (device_add(&sdkp->dev))
2918                 goto out_free_index;
2919
2920         get_device(dev);
2921         dev_set_drvdata(dev, sdkp);
2922
2923         get_device(&sdkp->dev); /* prevent release before async_schedule */
2924         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2925
2926         return 0;
2927
2928  out_free_index:
2929         spin_lock(&sd_index_lock);
2930         ida_remove(&sd_index_ida, index);
2931         spin_unlock(&sd_index_lock);
2932  out_put:
2933         put_disk(gd);
2934  out_free:
2935         kfree(sdkp);
2936  out:
2937         return error;
2938 }
2939
2940 /**
2941  *      sd_remove - called whenever a scsi disk (previously recognized by
2942  *      sd_probe) is detached from the system. It is called (potentially
2943  *      multiple times) during sd module unload.
2944  *      @sdp: pointer to mid level scsi device object
2945  *
2946  *      Note: this function is invoked from the scsi mid-level.
2947  *      This function potentially frees up a device name (e.g. /dev/sdc)
2948  *      that could be re-used by a subsequent sd_probe().
2949  *      This function is not called when the built-in sd driver is "exit-ed".
2950  **/
2951 static int sd_remove(struct device *dev)
2952 {
2953         struct scsi_disk *sdkp;
2954
2955         sdkp = dev_get_drvdata(dev);
2956         scsi_autopm_get_device(sdkp->device);
2957
2958         async_synchronize_full_domain(&scsi_sd_probe_domain);
2959         blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2960         blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2961         device_del(&sdkp->dev);
2962         del_gendisk(sdkp->disk);
2963         sd_shutdown(dev);
2964
2965         mutex_lock(&sd_ref_mutex);
2966         dev_set_drvdata(dev, NULL);
2967         put_device(&sdkp->dev);
2968         mutex_unlock(&sd_ref_mutex);
2969
2970         return 0;
2971 }
2972
2973 /**
2974  *      scsi_disk_release - Called to free the scsi_disk structure
2975  *      @dev: pointer to embedded class device
2976  *
2977  *      sd_ref_mutex must be held entering this routine.  Because it is
2978  *      called on last put, you should always use the scsi_disk_get()
2979  *      scsi_disk_put() helpers which manipulate the semaphore directly
2980  *      and never do a direct put_device.
2981  **/
2982 static void scsi_disk_release(struct device *dev)
2983 {
2984         struct scsi_disk *sdkp = to_scsi_disk(dev);
2985         struct gendisk *disk = sdkp->disk;
2986         
2987         spin_lock(&sd_index_lock);
2988         ida_remove(&sd_index_ida, sdkp->index);
2989         spin_unlock(&sd_index_lock);
2990
2991         disk->private_data = NULL;
2992         put_disk(disk);
2993         put_device(&sdkp->device->sdev_gendev);
2994
2995         kfree(sdkp);
2996 }
2997
2998 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2999 {
3000         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3001         struct scsi_sense_hdr sshdr;
3002         struct scsi_device *sdp = sdkp->device;
3003         int res;
3004
3005         if (start)
3006                 cmd[4] |= 1;    /* START */
3007
3008         if (sdp->start_stop_pwr_cond)
3009                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3010
3011         if (!scsi_device_online(sdp))
3012                 return -ENODEV;
3013
3014         res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3015                                SD_TIMEOUT, SD_MAX_RETRIES, NULL);
3016         if (res) {
3017                 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3018                 sd_print_result(sdkp, res);
3019                 if (driver_byte(res) & DRIVER_SENSE)
3020                         sd_print_sense_hdr(sdkp, &sshdr);
3021         }
3022
3023         return res;
3024 }
3025
3026 /*
3027  * Send a SYNCHRONIZE CACHE instruction down to the device through
3028  * the normal SCSI command structure.  Wait for the command to
3029  * complete.
3030  */
3031 static void sd_shutdown(struct device *dev)
3032 {
3033         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3034
3035         if (!sdkp)
3036                 return;         /* this can happen */
3037
3038         if (pm_runtime_suspended(dev))
3039                 goto exit;
3040
3041         if (sdkp->WCE) {
3042                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3043                 sd_sync_cache(sdkp);
3044         }
3045
3046         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3047                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3048                 sd_start_stop_device(sdkp, 0);
3049         }
3050
3051 exit:
3052         scsi_disk_put(sdkp);
3053 }
3054
3055 static int sd_suspend(struct device *dev, pm_message_t mesg)
3056 {
3057         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3058         int ret = 0;
3059
3060         if (!sdkp)
3061                 return 0;       /* this can happen */
3062
3063         if (sdkp->WCE) {
3064                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3065                 ret = sd_sync_cache(sdkp);
3066                 if (ret)
3067                         goto done;
3068         }
3069
3070         if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
3071                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3072                 ret = sd_start_stop_device(sdkp, 0);
3073         }
3074
3075 done:
3076         scsi_disk_put(sdkp);
3077         return ret;
3078 }
3079
3080 static int sd_resume(struct device *dev)
3081 {
3082         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3083         int ret = 0;
3084
3085         if (!sdkp->device->manage_start_stop)
3086                 goto done;
3087
3088         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3089         ret = sd_start_stop_device(sdkp, 1);
3090
3091 done:
3092         scsi_disk_put(sdkp);
3093         return ret;
3094 }
3095
3096 /**
3097  *      init_sd - entry point for this driver (both when built in or when
3098  *      a module).
3099  *
3100  *      Note: this function registers this driver with the scsi mid-level.
3101  **/
3102 static int __init init_sd(void)
3103 {
3104         int majors = 0, i, err;
3105
3106         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3107
3108         for (i = 0; i < SD_MAJORS; i++)
3109                 if (register_blkdev(sd_major(i), "sd") == 0)
3110                         majors++;
3111
3112         if (!majors)
3113                 return -ENODEV;
3114
3115         err = class_register(&sd_disk_class);
3116         if (err)
3117                 goto err_out;
3118
3119         err = scsi_register_driver(&sd_template.gendrv);
3120         if (err)
3121                 goto err_out_class;
3122
3123         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3124                                          0, 0, NULL);
3125         if (!sd_cdb_cache) {
3126                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3127                 goto err_out_class;
3128         }
3129
3130         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3131         if (!sd_cdb_pool) {
3132                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3133                 goto err_out_cache;
3134         }
3135
3136         return 0;
3137
3138 err_out_cache:
3139         kmem_cache_destroy(sd_cdb_cache);
3140
3141 err_out_class:
3142         class_unregister(&sd_disk_class);
3143 err_out:
3144         for (i = 0; i < SD_MAJORS; i++)
3145                 unregister_blkdev(sd_major(i), "sd");
3146         return err;
3147 }
3148
3149 /**
3150  *      exit_sd - exit point for this driver (when it is a module).
3151  *
3152  *      Note: this function unregisters this driver from the scsi mid-level.
3153  **/
3154 static void __exit exit_sd(void)
3155 {
3156         int i;
3157
3158         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3159
3160         mempool_destroy(sd_cdb_pool);
3161         kmem_cache_destroy(sd_cdb_cache);
3162
3163         scsi_unregister_driver(&sd_template.gendrv);
3164         class_unregister(&sd_disk_class);
3165
3166         for (i = 0; i < SD_MAJORS; i++)
3167                 unregister_blkdev(sd_major(i), "sd");
3168 }
3169
3170 module_init(init_sd);
3171 module_exit(exit_sd);
3172
3173 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3174                                struct scsi_sense_hdr *sshdr)
3175 {
3176         sd_printk(KERN_INFO, sdkp, " ");
3177         scsi_show_sense_hdr(sshdr);
3178         sd_printk(KERN_INFO, sdkp, " ");
3179         scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3180 }
3181
3182 static void sd_print_result(struct scsi_disk *sdkp, int result)
3183 {
3184         sd_printk(KERN_INFO, sdkp, " ");
3185         scsi_show_result(result);
3186 }
3187