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