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