1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <asm/uaccess.h> 51 52 #include <scsi/scsi.h> 53 #include <scsi/scsi_cmnd.h> 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_device.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_eh.h> 58 #include <scsi/scsi_host.h> 59 #include <scsi/scsi_ioctl.h> 60 #include <scsi/scsicam.h> 61 62 #include "sd.h" 63 #include "scsi_logging.h" 64 65 MODULE_AUTHOR("Eric Youngdale"); 66 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 67 MODULE_LICENSE("GPL"); 68 69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 88 89 static int sd_revalidate_disk(struct gendisk *); 90 static int sd_probe(struct device *); 91 static int sd_remove(struct device *); 92 static void sd_shutdown(struct device *); 93 static int sd_suspend(struct device *, pm_message_t state); 94 static int sd_resume(struct device *); 95 static void sd_rescan(struct device *); 96 static int sd_done(struct scsi_cmnd *); 97 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 98 static void scsi_disk_release(struct device *cdev); 99 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 100 static void sd_print_result(struct scsi_disk *, int); 101 102 static DEFINE_IDR(sd_index_idr); 103 static DEFINE_SPINLOCK(sd_index_lock); 104 105 /* This semaphore is used to mediate the 0->1 reference get in the 106 * face of object destruction (i.e. we can't allow a get on an 107 * object after last put) */ 108 static DEFINE_MUTEX(sd_ref_mutex); 109 110 static const char *sd_cache_types[] = { 111 "write through", "none", "write back", 112 "write back, no read (daft)" 113 }; 114 115 static ssize_t 116 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 117 const char *buf, size_t count) 118 { 119 int i, ct = -1, rcd, wce, sp; 120 struct scsi_disk *sdkp = to_scsi_disk(dev); 121 struct scsi_device *sdp = sdkp->device; 122 char buffer[64]; 123 char *buffer_data; 124 struct scsi_mode_data data; 125 struct scsi_sense_hdr sshdr; 126 int len; 127 128 if (sdp->type != TYPE_DISK) 129 /* no cache control on RBC devices; theoretically they 130 * can do it, but there's probably so many exceptions 131 * it's not worth the risk */ 132 return -EINVAL; 133 134 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 135 const int len = strlen(sd_cache_types[i]); 136 if (strncmp(sd_cache_types[i], buf, len) == 0 && 137 buf[len] == '\n') { 138 ct = i; 139 break; 140 } 141 } 142 if (ct < 0) 143 return -EINVAL; 144 rcd = ct & 0x01 ? 1 : 0; 145 wce = ct & 0x02 ? 1 : 0; 146 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 147 SD_MAX_RETRIES, &data, NULL)) 148 return -EINVAL; 149 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 150 data.block_descriptor_length); 151 buffer_data = buffer + data.header_length + 152 data.block_descriptor_length; 153 buffer_data[2] &= ~0x05; 154 buffer_data[2] |= wce << 2 | rcd; 155 sp = buffer_data[0] & 0x80 ? 1 : 0; 156 157 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 158 SD_MAX_RETRIES, &data, &sshdr)) { 159 if (scsi_sense_valid(&sshdr)) 160 sd_print_sense_hdr(sdkp, &sshdr); 161 return -EINVAL; 162 } 163 sd_revalidate_disk(sdkp->disk); 164 return count; 165 } 166 167 static ssize_t 168 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 169 const char *buf, size_t count) 170 { 171 struct scsi_disk *sdkp = to_scsi_disk(dev); 172 struct scsi_device *sdp = sdkp->device; 173 174 if (!capable(CAP_SYS_ADMIN)) 175 return -EACCES; 176 177 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 178 179 return count; 180 } 181 182 static ssize_t 183 sd_store_allow_restart(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 if (sdp->type != TYPE_DISK) 193 return -EINVAL; 194 195 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 196 197 return count; 198 } 199 200 static ssize_t 201 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 202 char *buf) 203 { 204 struct scsi_disk *sdkp = to_scsi_disk(dev); 205 int ct = sdkp->RCD + 2*sdkp->WCE; 206 207 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 208 } 209 210 static ssize_t 211 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 212 { 213 struct scsi_disk *sdkp = to_scsi_disk(dev); 214 215 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 216 } 217 218 static ssize_t 219 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 220 char *buf) 221 { 222 struct scsi_disk *sdkp = to_scsi_disk(dev); 223 struct scsi_device *sdp = sdkp->device; 224 225 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 226 } 227 228 static ssize_t 229 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 230 char *buf) 231 { 232 struct scsi_disk *sdkp = to_scsi_disk(dev); 233 234 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 235 } 236 237 static struct device_attribute sd_disk_attrs[] = { 238 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 239 sd_store_cache_type), 240 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 241 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 242 sd_store_allow_restart), 243 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 244 sd_store_manage_start_stop), 245 __ATTR_NULL, 246 }; 247 248 static struct class sd_disk_class = { 249 .name = "scsi_disk", 250 .owner = THIS_MODULE, 251 .dev_release = scsi_disk_release, 252 .dev_attrs = sd_disk_attrs, 253 }; 254 255 static struct scsi_driver sd_template = { 256 .owner = THIS_MODULE, 257 .gendrv = { 258 .name = "sd", 259 .probe = sd_probe, 260 .remove = sd_remove, 261 .suspend = sd_suspend, 262 .resume = sd_resume, 263 .shutdown = sd_shutdown, 264 }, 265 .rescan = sd_rescan, 266 .done = sd_done, 267 }; 268 269 /* 270 * Device no to disk mapping: 271 * 272 * major disc2 disc p1 273 * |............|.............|....|....| <- dev_t 274 * 31 20 19 8 7 4 3 0 275 * 276 * Inside a major, we have 16k disks, however mapped non- 277 * contiguously. The first 16 disks are for major0, the next 278 * ones with major1, ... Disk 256 is for major0 again, disk 272 279 * for major1, ... 280 * As we stay compatible with our numbering scheme, we can reuse 281 * the well-know SCSI majors 8, 65--71, 136--143. 282 */ 283 static int sd_major(int major_idx) 284 { 285 switch (major_idx) { 286 case 0: 287 return SCSI_DISK0_MAJOR; 288 case 1 ... 7: 289 return SCSI_DISK1_MAJOR + major_idx - 1; 290 case 8 ... 15: 291 return SCSI_DISK8_MAJOR + major_idx - 8; 292 default: 293 BUG(); 294 return 0; /* shut up gcc */ 295 } 296 } 297 298 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 299 { 300 struct scsi_disk *sdkp = NULL; 301 302 if (disk->private_data) { 303 sdkp = scsi_disk(disk); 304 if (scsi_device_get(sdkp->device) == 0) 305 get_device(&sdkp->dev); 306 else 307 sdkp = NULL; 308 } 309 return sdkp; 310 } 311 312 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 313 { 314 struct scsi_disk *sdkp; 315 316 mutex_lock(&sd_ref_mutex); 317 sdkp = __scsi_disk_get(disk); 318 mutex_unlock(&sd_ref_mutex); 319 return sdkp; 320 } 321 322 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 323 { 324 struct scsi_disk *sdkp; 325 326 mutex_lock(&sd_ref_mutex); 327 sdkp = dev_get_drvdata(dev); 328 if (sdkp) 329 sdkp = __scsi_disk_get(sdkp->disk); 330 mutex_unlock(&sd_ref_mutex); 331 return sdkp; 332 } 333 334 static void scsi_disk_put(struct scsi_disk *sdkp) 335 { 336 struct scsi_device *sdev = sdkp->device; 337 338 mutex_lock(&sd_ref_mutex); 339 put_device(&sdkp->dev); 340 scsi_device_put(sdev); 341 mutex_unlock(&sd_ref_mutex); 342 } 343 344 /** 345 * sd_init_command - build a scsi (read or write) command from 346 * information in the request structure. 347 * @SCpnt: pointer to mid-level's per scsi command structure that 348 * contains request and into which the scsi command is written 349 * 350 * Returns 1 if successful and 0 if error (or cannot be done now). 351 **/ 352 static int sd_prep_fn(struct request_queue *q, struct request *rq) 353 { 354 struct scsi_cmnd *SCpnt; 355 struct scsi_device *sdp = q->queuedata; 356 struct gendisk *disk = rq->rq_disk; 357 sector_t block = rq->sector; 358 unsigned int this_count = rq->nr_sectors; 359 unsigned int timeout = sdp->timeout; 360 int ret; 361 362 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 363 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 364 goto out; 365 } else if (rq->cmd_type != REQ_TYPE_FS) { 366 ret = BLKPREP_KILL; 367 goto out; 368 } 369 ret = scsi_setup_fs_cmnd(sdp, rq); 370 if (ret != BLKPREP_OK) 371 goto out; 372 SCpnt = rq->special; 373 374 /* from here on until we're complete, any goto out 375 * is used for a killable error condition */ 376 ret = BLKPREP_KILL; 377 378 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 379 "sd_init_command: block=%llu, " 380 "count=%d\n", 381 (unsigned long long)block, 382 this_count)); 383 384 if (!sdp || !scsi_device_online(sdp) || 385 block + rq->nr_sectors > get_capacity(disk)) { 386 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 387 "Finishing %ld sectors\n", 388 rq->nr_sectors)); 389 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 390 "Retry with 0x%p\n", SCpnt)); 391 goto out; 392 } 393 394 if (sdp->changed) { 395 /* 396 * quietly refuse to do anything to a changed disc until 397 * the changed bit has been reset 398 */ 399 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 400 goto out; 401 } 402 403 /* 404 * Some devices (some sdcards for one) don't like it if the 405 * last sector gets read in a larger then 1 sector read. 406 */ 407 if (unlikely(sdp->last_sector_bug && 408 rq->nr_sectors > sdp->sector_size / 512 && 409 block + this_count == get_capacity(disk))) 410 this_count -= sdp->sector_size / 512; 411 412 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 413 (unsigned long long)block)); 414 415 /* 416 * If we have a 1K hardware sectorsize, prevent access to single 417 * 512 byte sectors. In theory we could handle this - in fact 418 * the scsi cdrom driver must be able to handle this because 419 * we typically use 1K blocksizes, and cdroms typically have 420 * 2K hardware sectorsizes. Of course, things are simpler 421 * with the cdrom, since it is read-only. For performance 422 * reasons, the filesystems should be able to handle this 423 * and not force the scsi disk driver to use bounce buffers 424 * for this. 425 */ 426 if (sdp->sector_size == 1024) { 427 if ((block & 1) || (rq->nr_sectors & 1)) { 428 scmd_printk(KERN_ERR, SCpnt, 429 "Bad block number requested\n"); 430 goto out; 431 } else { 432 block = block >> 1; 433 this_count = this_count >> 1; 434 } 435 } 436 if (sdp->sector_size == 2048) { 437 if ((block & 3) || (rq->nr_sectors & 3)) { 438 scmd_printk(KERN_ERR, SCpnt, 439 "Bad block number requested\n"); 440 goto out; 441 } else { 442 block = block >> 2; 443 this_count = this_count >> 2; 444 } 445 } 446 if (sdp->sector_size == 4096) { 447 if ((block & 7) || (rq->nr_sectors & 7)) { 448 scmd_printk(KERN_ERR, SCpnt, 449 "Bad block number requested\n"); 450 goto out; 451 } else { 452 block = block >> 3; 453 this_count = this_count >> 3; 454 } 455 } 456 if (rq_data_dir(rq) == WRITE) { 457 if (!sdp->writeable) { 458 goto out; 459 } 460 SCpnt->cmnd[0] = WRITE_6; 461 SCpnt->sc_data_direction = DMA_TO_DEVICE; 462 } else if (rq_data_dir(rq) == READ) { 463 SCpnt->cmnd[0] = READ_6; 464 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 465 } else { 466 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 467 goto out; 468 } 469 470 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 471 "%s %d/%ld 512 byte blocks.\n", 472 (rq_data_dir(rq) == WRITE) ? 473 "writing" : "reading", this_count, 474 rq->nr_sectors)); 475 476 SCpnt->cmnd[1] = 0; 477 478 if (block > 0xffffffff) { 479 SCpnt->cmnd[0] += READ_16 - READ_6; 480 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 481 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 482 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 483 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 484 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 485 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 486 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 487 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 488 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 489 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 490 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 491 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 492 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 493 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 494 } else if ((this_count > 0xff) || (block > 0x1fffff) || 495 SCpnt->device->use_10_for_rw) { 496 if (this_count > 0xffff) 497 this_count = 0xffff; 498 499 SCpnt->cmnd[0] += READ_10 - READ_6; 500 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 501 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 502 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 503 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 504 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 505 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 506 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 507 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 508 } else { 509 if (unlikely(blk_fua_rq(rq))) { 510 /* 511 * This happens only if this drive failed 512 * 10byte rw command with ILLEGAL_REQUEST 513 * during operation and thus turned off 514 * use_10_for_rw. 515 */ 516 scmd_printk(KERN_ERR, SCpnt, 517 "FUA write on READ/WRITE(6) drive\n"); 518 goto out; 519 } 520 521 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 522 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 523 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 524 SCpnt->cmnd[4] = (unsigned char) this_count; 525 SCpnt->cmnd[5] = 0; 526 } 527 SCpnt->sdb.length = this_count * sdp->sector_size; 528 529 /* 530 * We shouldn't disconnect in the middle of a sector, so with a dumb 531 * host adapter, it's safe to assume that we can at least transfer 532 * this many bytes between each connect / disconnect. 533 */ 534 SCpnt->transfersize = sdp->sector_size; 535 SCpnt->underflow = this_count << 9; 536 SCpnt->allowed = SD_MAX_RETRIES; 537 SCpnt->timeout_per_command = timeout; 538 539 /* 540 * This indicates that the command is ready from our end to be 541 * queued. 542 */ 543 ret = BLKPREP_OK; 544 out: 545 return scsi_prep_return(q, rq, ret); 546 } 547 548 /** 549 * sd_open - open a scsi disk device 550 * @inode: only i_rdev member may be used 551 * @filp: only f_mode and f_flags may be used 552 * 553 * Returns 0 if successful. Returns a negated errno value in case 554 * of error. 555 * 556 * Note: This can be called from a user context (e.g. fsck(1) ) 557 * or from within the kernel (e.g. as a result of a mount(1) ). 558 * In the latter case @inode and @filp carry an abridged amount 559 * of information as noted above. 560 **/ 561 static int sd_open(struct inode *inode, struct file *filp) 562 { 563 struct gendisk *disk = inode->i_bdev->bd_disk; 564 struct scsi_disk *sdkp; 565 struct scsi_device *sdev; 566 int retval; 567 568 if (!(sdkp = scsi_disk_get(disk))) 569 return -ENXIO; 570 571 572 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 573 574 sdev = sdkp->device; 575 576 /* 577 * If the device is in error recovery, wait until it is done. 578 * If the device is offline, then disallow any access to it. 579 */ 580 retval = -ENXIO; 581 if (!scsi_block_when_processing_errors(sdev)) 582 goto error_out; 583 584 if (sdev->removable || sdkp->write_prot) 585 check_disk_change(inode->i_bdev); 586 587 /* 588 * If the drive is empty, just let the open fail. 589 */ 590 retval = -ENOMEDIUM; 591 if (sdev->removable && !sdkp->media_present && 592 !(filp->f_flags & O_NDELAY)) 593 goto error_out; 594 595 /* 596 * If the device has the write protect tab set, have the open fail 597 * if the user expects to be able to write to the thing. 598 */ 599 retval = -EROFS; 600 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) 601 goto error_out; 602 603 /* 604 * It is possible that the disk changing stuff resulted in 605 * the device being taken offline. If this is the case, 606 * report this to the user, and don't pretend that the 607 * open actually succeeded. 608 */ 609 retval = -ENXIO; 610 if (!scsi_device_online(sdev)) 611 goto error_out; 612 613 if (!sdkp->openers++ && sdev->removable) { 614 if (scsi_block_when_processing_errors(sdev)) 615 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 616 } 617 618 return 0; 619 620 error_out: 621 scsi_disk_put(sdkp); 622 return retval; 623 } 624 625 /** 626 * sd_release - invoked when the (last) close(2) is called on this 627 * scsi disk. 628 * @inode: only i_rdev member may be used 629 * @filp: only f_mode and f_flags may be used 630 * 631 * Returns 0. 632 * 633 * Note: may block (uninterruptible) if error recovery is underway 634 * on this disk. 635 **/ 636 static int sd_release(struct inode *inode, struct file *filp) 637 { 638 struct gendisk *disk = inode->i_bdev->bd_disk; 639 struct scsi_disk *sdkp = scsi_disk(disk); 640 struct scsi_device *sdev = sdkp->device; 641 642 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 643 644 if (!--sdkp->openers && sdev->removable) { 645 if (scsi_block_when_processing_errors(sdev)) 646 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 647 } 648 649 /* 650 * XXX and what if there are packets in flight and this close() 651 * XXX is followed by a "rmmod sd_mod"? 652 */ 653 scsi_disk_put(sdkp); 654 return 0; 655 } 656 657 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 658 { 659 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 660 struct scsi_device *sdp = sdkp->device; 661 struct Scsi_Host *host = sdp->host; 662 int diskinfo[4]; 663 664 /* default to most commonly used values */ 665 diskinfo[0] = 0x40; /* 1 << 6 */ 666 diskinfo[1] = 0x20; /* 1 << 5 */ 667 diskinfo[2] = sdkp->capacity >> 11; 668 669 /* override with calculated, extended default, or driver values */ 670 if (host->hostt->bios_param) 671 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 672 else 673 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 674 675 geo->heads = diskinfo[0]; 676 geo->sectors = diskinfo[1]; 677 geo->cylinders = diskinfo[2]; 678 return 0; 679 } 680 681 /** 682 * sd_ioctl - process an ioctl 683 * @inode: only i_rdev/i_bdev members may be used 684 * @filp: only f_mode and f_flags may be used 685 * @cmd: ioctl command number 686 * @arg: this is third argument given to ioctl(2) system call. 687 * Often contains a pointer. 688 * 689 * Returns 0 if successful (some ioctls return postive numbers on 690 * success as well). Returns a negated errno value in case of error. 691 * 692 * Note: most ioctls are forward onto the block subsystem or further 693 * down in the scsi subsystem. 694 **/ 695 static int sd_ioctl(struct inode * inode, struct file * filp, 696 unsigned int cmd, unsigned long arg) 697 { 698 struct block_device *bdev = inode->i_bdev; 699 struct gendisk *disk = bdev->bd_disk; 700 struct scsi_device *sdp = scsi_disk(disk)->device; 701 void __user *p = (void __user *)arg; 702 int error; 703 704 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 705 disk->disk_name, cmd)); 706 707 /* 708 * If we are in the middle of error recovery, don't let anyone 709 * else try and use this device. Also, if error recovery fails, it 710 * may try and take the device offline, in which case all further 711 * access to the device is prohibited. 712 */ 713 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); 714 if (!scsi_block_when_processing_errors(sdp) || !error) 715 return error; 716 717 /* 718 * Send SCSI addressing ioctls directly to mid level, send other 719 * ioctls to block level and then onto mid level if they can't be 720 * resolved. 721 */ 722 switch (cmd) { 723 case SCSI_IOCTL_GET_IDLUN: 724 case SCSI_IOCTL_GET_BUS_NUMBER: 725 return scsi_ioctl(sdp, cmd, p); 726 default: 727 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p); 728 if (error != -ENOTTY) 729 return error; 730 } 731 return scsi_ioctl(sdp, cmd, p); 732 } 733 734 static void set_media_not_present(struct scsi_disk *sdkp) 735 { 736 sdkp->media_present = 0; 737 sdkp->capacity = 0; 738 sdkp->device->changed = 1; 739 } 740 741 /** 742 * sd_media_changed - check if our medium changed 743 * @disk: kernel device descriptor 744 * 745 * Returns 0 if not applicable or no change; 1 if change 746 * 747 * Note: this function is invoked from the block subsystem. 748 **/ 749 static int sd_media_changed(struct gendisk *disk) 750 { 751 struct scsi_disk *sdkp = scsi_disk(disk); 752 struct scsi_device *sdp = sdkp->device; 753 struct scsi_sense_hdr *sshdr = NULL; 754 int retval; 755 756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 757 758 if (!sdp->removable) 759 return 0; 760 761 /* 762 * If the device is offline, don't send any commands - just pretend as 763 * if the command failed. If the device ever comes back online, we 764 * can deal with it then. It is only because of unrecoverable errors 765 * that we would ever take a device offline in the first place. 766 */ 767 if (!scsi_device_online(sdp)) { 768 set_media_not_present(sdkp); 769 retval = 1; 770 goto out; 771 } 772 773 /* 774 * Using TEST_UNIT_READY enables differentiation between drive with 775 * no cartridge loaded - NOT READY, drive with changed cartridge - 776 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 777 * 778 * Drives that auto spin down. eg iomega jaz 1G, will be started 779 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 780 * sd_revalidate() is called. 781 */ 782 retval = -ENODEV; 783 784 if (scsi_block_when_processing_errors(sdp)) { 785 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 786 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 787 sshdr); 788 } 789 790 /* 791 * Unable to test, unit probably not ready. This usually 792 * means there is no disc in the drive. Mark as changed, 793 * and we will figure it out later once the drive is 794 * available again. 795 */ 796 if (retval || (scsi_sense_valid(sshdr) && 797 /* 0x3a is medium not present */ 798 sshdr->asc == 0x3a)) { 799 set_media_not_present(sdkp); 800 retval = 1; 801 goto out; 802 } 803 804 /* 805 * For removable scsi disk we have to recognise the presence 806 * of a disk in the drive. This is kept in the struct scsi_disk 807 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 808 */ 809 sdkp->media_present = 1; 810 811 retval = sdp->changed; 812 sdp->changed = 0; 813 out: 814 if (retval != sdkp->previous_state) 815 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 816 sdkp->previous_state = retval; 817 kfree(sshdr); 818 return retval; 819 } 820 821 static int sd_sync_cache(struct scsi_disk *sdkp) 822 { 823 int retries, res; 824 struct scsi_device *sdp = sdkp->device; 825 struct scsi_sense_hdr sshdr; 826 827 if (!scsi_device_online(sdp)) 828 return -ENODEV; 829 830 831 for (retries = 3; retries > 0; --retries) { 832 unsigned char cmd[10] = { 0 }; 833 834 cmd[0] = SYNCHRONIZE_CACHE; 835 /* 836 * Leave the rest of the command zero to indicate 837 * flush everything. 838 */ 839 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 840 SD_TIMEOUT, SD_MAX_RETRIES); 841 if (res == 0) 842 break; 843 } 844 845 if (res) { 846 sd_print_result(sdkp, res); 847 if (driver_byte(res) & DRIVER_SENSE) 848 sd_print_sense_hdr(sdkp, &sshdr); 849 } 850 851 if (res) 852 return -EIO; 853 return 0; 854 } 855 856 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 857 { 858 rq->cmd_type = REQ_TYPE_BLOCK_PC; 859 rq->timeout = SD_TIMEOUT; 860 rq->cmd[0] = SYNCHRONIZE_CACHE; 861 rq->cmd_len = 10; 862 } 863 864 static void sd_rescan(struct device *dev) 865 { 866 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 867 868 if (sdkp) { 869 sd_revalidate_disk(sdkp->disk); 870 scsi_disk_put(sdkp); 871 } 872 } 873 874 875 #ifdef CONFIG_COMPAT 876 /* 877 * This gets directly called from VFS. When the ioctl 878 * is not recognized we go back to the other translation paths. 879 */ 880 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 881 { 882 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; 883 struct gendisk *disk = bdev->bd_disk; 884 struct scsi_device *sdev = scsi_disk(disk)->device; 885 886 /* 887 * If we are in the middle of error recovery, don't let anyone 888 * else try and use this device. Also, if error recovery fails, it 889 * may try and take the device offline, in which case all further 890 * access to the device is prohibited. 891 */ 892 if (!scsi_block_when_processing_errors(sdev)) 893 return -ENODEV; 894 895 if (sdev->host->hostt->compat_ioctl) { 896 int ret; 897 898 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 899 900 return ret; 901 } 902 903 /* 904 * Let the static ioctl translation table take care of it. 905 */ 906 return -ENOIOCTLCMD; 907 } 908 #endif 909 910 static struct block_device_operations sd_fops = { 911 .owner = THIS_MODULE, 912 .open = sd_open, 913 .release = sd_release, 914 .ioctl = sd_ioctl, 915 .getgeo = sd_getgeo, 916 #ifdef CONFIG_COMPAT 917 .compat_ioctl = sd_compat_ioctl, 918 #endif 919 .media_changed = sd_media_changed, 920 .revalidate_disk = sd_revalidate_disk, 921 }; 922 923 /** 924 * sd_done - bottom half handler: called when the lower level 925 * driver has completed (successfully or otherwise) a scsi command. 926 * @SCpnt: mid-level's per command structure. 927 * 928 * Note: potentially run from within an ISR. Must not block. 929 **/ 930 static int sd_done(struct scsi_cmnd *SCpnt) 931 { 932 int result = SCpnt->result; 933 unsigned int xfer_size = scsi_bufflen(SCpnt); 934 unsigned int good_bytes = result ? 0 : xfer_size; 935 u64 start_lba = SCpnt->request->sector; 936 u64 end_lba = SCpnt->request->sector + (xfer_size / 512); 937 u64 bad_lba; 938 struct scsi_sense_hdr sshdr; 939 int sense_valid = 0; 940 int sense_deferred = 0; 941 int info_valid; 942 943 if (result) { 944 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 945 if (sense_valid) 946 sense_deferred = scsi_sense_is_deferred(&sshdr); 947 } 948 #ifdef CONFIG_SCSI_LOGGING 949 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 950 if (sense_valid) { 951 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 952 "sd_done: sb[respc,sk,asc," 953 "ascq]=%x,%x,%x,%x\n", 954 sshdr.response_code, 955 sshdr.sense_key, sshdr.asc, 956 sshdr.ascq)); 957 } 958 #endif 959 if (driver_byte(result) != DRIVER_SENSE && 960 (!sense_valid || sense_deferred)) 961 goto out; 962 963 switch (sshdr.sense_key) { 964 case HARDWARE_ERROR: 965 case MEDIUM_ERROR: 966 if (!blk_fs_request(SCpnt->request)) 967 goto out; 968 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, 969 SCSI_SENSE_BUFFERSIZE, 970 &bad_lba); 971 if (!info_valid) 972 goto out; 973 if (xfer_size <= SCpnt->device->sector_size) 974 goto out; 975 if (SCpnt->device->sector_size < 512) { 976 /* only legitimate sector_size here is 256 */ 977 start_lba <<= 1; 978 end_lba <<= 1; 979 } else { 980 /* be careful ... don't want any overflows */ 981 u64 factor = SCpnt->device->sector_size / 512; 982 do_div(start_lba, factor); 983 do_div(end_lba, factor); 984 } 985 986 if (bad_lba < start_lba || bad_lba >= end_lba) 987 /* the bad lba was reported incorrectly, we have 988 * no idea where the error is 989 */ 990 goto out; 991 992 /* This computation should always be done in terms of 993 * the resolution of the device's medium. 994 */ 995 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; 996 break; 997 case RECOVERED_ERROR: 998 case NO_SENSE: 999 /* Inform the user, but make sure that it's not treated 1000 * as a hard error. 1001 */ 1002 scsi_print_sense("sd", SCpnt); 1003 SCpnt->result = 0; 1004 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1005 good_bytes = xfer_size; 1006 break; 1007 case ILLEGAL_REQUEST: 1008 if (SCpnt->device->use_10_for_rw && 1009 (SCpnt->cmnd[0] == READ_10 || 1010 SCpnt->cmnd[0] == WRITE_10)) 1011 SCpnt->device->use_10_for_rw = 0; 1012 if (SCpnt->device->use_10_for_ms && 1013 (SCpnt->cmnd[0] == MODE_SENSE_10 || 1014 SCpnt->cmnd[0] == MODE_SELECT_10)) 1015 SCpnt->device->use_10_for_ms = 0; 1016 break; 1017 default: 1018 break; 1019 } 1020 out: 1021 return good_bytes; 1022 } 1023 1024 static int media_not_present(struct scsi_disk *sdkp, 1025 struct scsi_sense_hdr *sshdr) 1026 { 1027 1028 if (!scsi_sense_valid(sshdr)) 1029 return 0; 1030 /* not invoked for commands that could return deferred errors */ 1031 if (sshdr->sense_key != NOT_READY && 1032 sshdr->sense_key != UNIT_ATTENTION) 1033 return 0; 1034 if (sshdr->asc != 0x3A) /* medium not present */ 1035 return 0; 1036 1037 set_media_not_present(sdkp); 1038 return 1; 1039 } 1040 1041 /* 1042 * spinup disk - called only in sd_revalidate_disk() 1043 */ 1044 static void 1045 sd_spinup_disk(struct scsi_disk *sdkp) 1046 { 1047 unsigned char cmd[10]; 1048 unsigned long spintime_expire = 0; 1049 int retries, spintime; 1050 unsigned int the_result; 1051 struct scsi_sense_hdr sshdr; 1052 int sense_valid = 0; 1053 1054 spintime = 0; 1055 1056 /* Spin up drives, as required. Only do this at boot time */ 1057 /* Spinup needs to be done for module loads too. */ 1058 do { 1059 retries = 0; 1060 1061 do { 1062 cmd[0] = TEST_UNIT_READY; 1063 memset((void *) &cmd[1], 0, 9); 1064 1065 the_result = scsi_execute_req(sdkp->device, cmd, 1066 DMA_NONE, NULL, 0, 1067 &sshdr, SD_TIMEOUT, 1068 SD_MAX_RETRIES); 1069 1070 /* 1071 * If the drive has indicated to us that it 1072 * doesn't have any media in it, don't bother 1073 * with any more polling. 1074 */ 1075 if (media_not_present(sdkp, &sshdr)) 1076 return; 1077 1078 if (the_result) 1079 sense_valid = scsi_sense_valid(&sshdr); 1080 retries++; 1081 } while (retries < 3 && 1082 (!scsi_status_is_good(the_result) || 1083 ((driver_byte(the_result) & DRIVER_SENSE) && 1084 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1085 1086 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1087 /* no sense, TUR either succeeded or failed 1088 * with a status error */ 1089 if(!spintime && !scsi_status_is_good(the_result)) { 1090 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1091 sd_print_result(sdkp, the_result); 1092 } 1093 break; 1094 } 1095 1096 /* 1097 * The device does not want the automatic start to be issued. 1098 */ 1099 if (sdkp->device->no_start_on_add) { 1100 break; 1101 } 1102 1103 /* 1104 * If manual intervention is required, or this is an 1105 * absent USB storage device, a spinup is meaningless. 1106 */ 1107 if (sense_valid && 1108 sshdr.sense_key == NOT_READY && 1109 sshdr.asc == 4 && sshdr.ascq == 3) { 1110 break; /* manual intervention required */ 1111 1112 /* 1113 * Issue command to spin up drive when not ready 1114 */ 1115 } else if (sense_valid && sshdr.sense_key == NOT_READY) { 1116 if (!spintime) { 1117 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1118 cmd[0] = START_STOP; 1119 cmd[1] = 1; /* Return immediately */ 1120 memset((void *) &cmd[2], 0, 8); 1121 cmd[4] = 1; /* Start spin cycle */ 1122 if (sdkp->device->start_stop_pwr_cond) 1123 cmd[4] |= 1 << 4; 1124 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1125 NULL, 0, &sshdr, 1126 SD_TIMEOUT, SD_MAX_RETRIES); 1127 spintime_expire = jiffies + 100 * HZ; 1128 spintime = 1; 1129 } 1130 /* Wait 1 second for next try */ 1131 msleep(1000); 1132 printk("."); 1133 1134 /* 1135 * Wait for USB flash devices with slow firmware. 1136 * Yes, this sense key/ASC combination shouldn't 1137 * occur here. It's characteristic of these devices. 1138 */ 1139 } else if (sense_valid && 1140 sshdr.sense_key == UNIT_ATTENTION && 1141 sshdr.asc == 0x28) { 1142 if (!spintime) { 1143 spintime_expire = jiffies + 5 * HZ; 1144 spintime = 1; 1145 } 1146 /* Wait 1 second for next try */ 1147 msleep(1000); 1148 } else { 1149 /* we don't understand the sense code, so it's 1150 * probably pointless to loop */ 1151 if(!spintime) { 1152 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1153 sd_print_sense_hdr(sdkp, &sshdr); 1154 } 1155 break; 1156 } 1157 1158 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1159 1160 if (spintime) { 1161 if (scsi_status_is_good(the_result)) 1162 printk("ready\n"); 1163 else 1164 printk("not responding...\n"); 1165 } 1166 } 1167 1168 /* 1169 * read disk capacity 1170 */ 1171 static void 1172 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1173 { 1174 unsigned char cmd[16]; 1175 int the_result, retries; 1176 int sector_size = 0; 1177 int longrc = 0; 1178 struct scsi_sense_hdr sshdr; 1179 int sense_valid = 0; 1180 struct scsi_device *sdp = sdkp->device; 1181 1182 repeat: 1183 retries = 3; 1184 do { 1185 if (longrc) { 1186 memset((void *) cmd, 0, 16); 1187 cmd[0] = SERVICE_ACTION_IN; 1188 cmd[1] = SAI_READ_CAPACITY_16; 1189 cmd[13] = 12; 1190 memset((void *) buffer, 0, 12); 1191 } else { 1192 cmd[0] = READ_CAPACITY; 1193 memset((void *) &cmd[1], 0, 9); 1194 memset((void *) buffer, 0, 8); 1195 } 1196 1197 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1198 buffer, longrc ? 12 : 8, &sshdr, 1199 SD_TIMEOUT, SD_MAX_RETRIES); 1200 1201 if (media_not_present(sdkp, &sshdr)) 1202 return; 1203 1204 if (the_result) 1205 sense_valid = scsi_sense_valid(&sshdr); 1206 retries--; 1207 1208 } while (the_result && retries); 1209 1210 if (the_result && !longrc) { 1211 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1212 sd_print_result(sdkp, the_result); 1213 if (driver_byte(the_result) & DRIVER_SENSE) 1214 sd_print_sense_hdr(sdkp, &sshdr); 1215 else 1216 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1217 1218 /* Set dirty bit for removable devices if not ready - 1219 * sometimes drives will not report this properly. */ 1220 if (sdp->removable && 1221 sense_valid && sshdr.sense_key == NOT_READY) 1222 sdp->changed = 1; 1223 1224 /* Either no media are present but the drive didn't tell us, 1225 or they are present but the read capacity command fails */ 1226 /* sdkp->media_present = 0; -- not always correct */ 1227 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1228 1229 return; 1230 } else if (the_result && longrc) { 1231 /* READ CAPACITY(16) has been failed */ 1232 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1233 sd_print_result(sdkp, the_result); 1234 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); 1235 1236 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1237 goto got_data; 1238 } 1239 1240 if (!longrc) { 1241 sector_size = (buffer[4] << 24) | 1242 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 1243 if (buffer[0] == 0xff && buffer[1] == 0xff && 1244 buffer[2] == 0xff && buffer[3] == 0xff) { 1245 if(sizeof(sdkp->capacity) > 4) { 1246 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1247 "Trying to use READ CAPACITY(16).\n"); 1248 longrc = 1; 1249 goto repeat; 1250 } 1251 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " 1252 "a kernel compiled with support for large " 1253 "block devices.\n"); 1254 sdkp->capacity = 0; 1255 goto got_data; 1256 } 1257 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | 1258 (buffer[1] << 16) | 1259 (buffer[2] << 8) | 1260 buffer[3]); 1261 } else { 1262 sdkp->capacity = 1 + (((u64)buffer[0] << 56) | 1263 ((u64)buffer[1] << 48) | 1264 ((u64)buffer[2] << 40) | 1265 ((u64)buffer[3] << 32) | 1266 ((sector_t)buffer[4] << 24) | 1267 ((sector_t)buffer[5] << 16) | 1268 ((sector_t)buffer[6] << 8) | 1269 (sector_t)buffer[7]); 1270 1271 sector_size = (buffer[8] << 24) | 1272 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; 1273 } 1274 1275 /* Some devices return the total number of sectors, not the 1276 * highest sector number. Make the necessary adjustment. */ 1277 if (sdp->fix_capacity) { 1278 --sdkp->capacity; 1279 1280 /* Some devices have version which report the correct sizes 1281 * and others which do not. We guess size according to a heuristic 1282 * and err on the side of lowering the capacity. */ 1283 } else { 1284 if (sdp->guess_capacity) 1285 if (sdkp->capacity & 0x01) /* odd sizes are odd */ 1286 --sdkp->capacity; 1287 } 1288 1289 got_data: 1290 if (sector_size == 0) { 1291 sector_size = 512; 1292 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1293 "assuming 512.\n"); 1294 } 1295 1296 if (sector_size != 512 && 1297 sector_size != 1024 && 1298 sector_size != 2048 && 1299 sector_size != 4096 && 1300 sector_size != 256) { 1301 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1302 sector_size); 1303 /* 1304 * The user might want to re-format the drive with 1305 * a supported sectorsize. Once this happens, it 1306 * would be relatively trivial to set the thing up. 1307 * For this reason, we leave the thing in the table. 1308 */ 1309 sdkp->capacity = 0; 1310 /* 1311 * set a bogus sector size so the normal read/write 1312 * logic in the block layer will eventually refuse any 1313 * request on this device without tripping over power 1314 * of two sector size assumptions 1315 */ 1316 sector_size = 512; 1317 } 1318 { 1319 /* 1320 * The msdos fs needs to know the hardware sector size 1321 * So I have created this table. See ll_rw_blk.c 1322 * Jacques Gelinas (Jacques@solucorp.qc.ca) 1323 */ 1324 int hard_sector = sector_size; 1325 sector_t sz = (sdkp->capacity/2) * (hard_sector/256); 1326 struct request_queue *queue = sdp->request_queue; 1327 sector_t mb = sz; 1328 1329 blk_queue_hardsect_size(queue, hard_sector); 1330 /* avoid 64-bit division on 32-bit platforms */ 1331 sector_div(sz, 625); 1332 mb -= sz - 974; 1333 sector_div(mb, 1950); 1334 1335 sd_printk(KERN_NOTICE, sdkp, 1336 "%llu %d-byte hardware sectors (%llu MB)\n", 1337 (unsigned long long)sdkp->capacity, 1338 hard_sector, (unsigned long long)mb); 1339 } 1340 1341 /* Rescale capacity to 512-byte units */ 1342 if (sector_size == 4096) 1343 sdkp->capacity <<= 3; 1344 else if (sector_size == 2048) 1345 sdkp->capacity <<= 2; 1346 else if (sector_size == 1024) 1347 sdkp->capacity <<= 1; 1348 else if (sector_size == 256) 1349 sdkp->capacity >>= 1; 1350 1351 sdkp->device->sector_size = sector_size; 1352 } 1353 1354 /* called with buffer of length 512 */ 1355 static inline int 1356 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1357 unsigned char *buffer, int len, struct scsi_mode_data *data, 1358 struct scsi_sense_hdr *sshdr) 1359 { 1360 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1361 SD_TIMEOUT, SD_MAX_RETRIES, data, 1362 sshdr); 1363 } 1364 1365 /* 1366 * read write protect setting, if possible - called only in sd_revalidate_disk() 1367 * called with buffer of length SD_BUF_SIZE 1368 */ 1369 static void 1370 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1371 { 1372 int res; 1373 struct scsi_device *sdp = sdkp->device; 1374 struct scsi_mode_data data; 1375 1376 set_disk_ro(sdkp->disk, 0); 1377 if (sdp->skip_ms_page_3f) { 1378 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1379 return; 1380 } 1381 1382 if (sdp->use_192_bytes_for_3f) { 1383 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1384 } else { 1385 /* 1386 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1387 * We have to start carefully: some devices hang if we ask 1388 * for more than is available. 1389 */ 1390 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1391 1392 /* 1393 * Second attempt: ask for page 0 When only page 0 is 1394 * implemented, a request for page 3F may return Sense Key 1395 * 5: Illegal Request, Sense Code 24: Invalid field in 1396 * CDB. 1397 */ 1398 if (!scsi_status_is_good(res)) 1399 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1400 1401 /* 1402 * Third attempt: ask 255 bytes, as we did earlier. 1403 */ 1404 if (!scsi_status_is_good(res)) 1405 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1406 &data, NULL); 1407 } 1408 1409 if (!scsi_status_is_good(res)) { 1410 sd_printk(KERN_WARNING, sdkp, 1411 "Test WP failed, assume Write Enabled\n"); 1412 } else { 1413 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1414 set_disk_ro(sdkp->disk, sdkp->write_prot); 1415 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1416 sdkp->write_prot ? "on" : "off"); 1417 sd_printk(KERN_DEBUG, sdkp, 1418 "Mode Sense: %02x %02x %02x %02x\n", 1419 buffer[0], buffer[1], buffer[2], buffer[3]); 1420 } 1421 } 1422 1423 /* 1424 * sd_read_cache_type - called only from sd_revalidate_disk() 1425 * called with buffer of length SD_BUF_SIZE 1426 */ 1427 static void 1428 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1429 { 1430 int len = 0, res; 1431 struct scsi_device *sdp = sdkp->device; 1432 1433 int dbd; 1434 int modepage; 1435 struct scsi_mode_data data; 1436 struct scsi_sense_hdr sshdr; 1437 1438 if (sdp->skip_ms_page_8) 1439 goto defaults; 1440 1441 if (sdp->type == TYPE_RBC) { 1442 modepage = 6; 1443 dbd = 8; 1444 } else { 1445 modepage = 8; 1446 dbd = 0; 1447 } 1448 1449 /* cautiously ask */ 1450 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1451 1452 if (!scsi_status_is_good(res)) 1453 goto bad_sense; 1454 1455 if (!data.header_length) { 1456 modepage = 6; 1457 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1458 } 1459 1460 /* that went OK, now ask for the proper length */ 1461 len = data.length; 1462 1463 /* 1464 * We're only interested in the first three bytes, actually. 1465 * But the data cache page is defined for the first 20. 1466 */ 1467 if (len < 3) 1468 goto bad_sense; 1469 if (len > 20) 1470 len = 20; 1471 1472 /* Take headers and block descriptors into account */ 1473 len += data.header_length + data.block_descriptor_length; 1474 if (len > SD_BUF_SIZE) 1475 goto bad_sense; 1476 1477 /* Get the data */ 1478 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1479 1480 if (scsi_status_is_good(res)) { 1481 int offset = data.header_length + data.block_descriptor_length; 1482 1483 if (offset >= SD_BUF_SIZE - 2) { 1484 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1485 goto defaults; 1486 } 1487 1488 if ((buffer[offset] & 0x3f) != modepage) { 1489 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1490 goto defaults; 1491 } 1492 1493 if (modepage == 8) { 1494 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1495 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1496 } else { 1497 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1498 sdkp->RCD = 0; 1499 } 1500 1501 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1502 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1503 sd_printk(KERN_NOTICE, sdkp, 1504 "Uses READ/WRITE(6), disabling FUA\n"); 1505 sdkp->DPOFUA = 0; 1506 } 1507 1508 sd_printk(KERN_NOTICE, sdkp, 1509 "Write cache: %s, read cache: %s, %s\n", 1510 sdkp->WCE ? "enabled" : "disabled", 1511 sdkp->RCD ? "disabled" : "enabled", 1512 sdkp->DPOFUA ? "supports DPO and FUA" 1513 : "doesn't support DPO or FUA"); 1514 1515 return; 1516 } 1517 1518 bad_sense: 1519 if (scsi_sense_valid(&sshdr) && 1520 sshdr.sense_key == ILLEGAL_REQUEST && 1521 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1522 /* Invalid field in CDB */ 1523 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1524 else 1525 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1526 1527 defaults: 1528 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1529 sdkp->WCE = 0; 1530 sdkp->RCD = 0; 1531 sdkp->DPOFUA = 0; 1532 } 1533 1534 /** 1535 * sd_revalidate_disk - called the first time a new disk is seen, 1536 * performs disk spin up, read_capacity, etc. 1537 * @disk: struct gendisk we care about 1538 **/ 1539 static int sd_revalidate_disk(struct gendisk *disk) 1540 { 1541 struct scsi_disk *sdkp = scsi_disk(disk); 1542 struct scsi_device *sdp = sdkp->device; 1543 unsigned char *buffer; 1544 unsigned ordered; 1545 1546 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 1547 "sd_revalidate_disk\n")); 1548 1549 /* 1550 * If the device is offline, don't try and read capacity or any 1551 * of the other niceties. 1552 */ 1553 if (!scsi_device_online(sdp)) 1554 goto out; 1555 1556 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 1557 if (!buffer) { 1558 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 1559 "allocation failure.\n"); 1560 goto out; 1561 } 1562 1563 /* defaults, until the device tells us otherwise */ 1564 sdp->sector_size = 512; 1565 sdkp->capacity = 0; 1566 sdkp->media_present = 1; 1567 sdkp->write_prot = 0; 1568 sdkp->WCE = 0; 1569 sdkp->RCD = 0; 1570 1571 sd_spinup_disk(sdkp); 1572 1573 /* 1574 * Without media there is no reason to ask; moreover, some devices 1575 * react badly if we do. 1576 */ 1577 if (sdkp->media_present) { 1578 sd_read_capacity(sdkp, buffer); 1579 sd_read_write_protect_flag(sdkp, buffer); 1580 sd_read_cache_type(sdkp, buffer); 1581 } 1582 1583 /* 1584 * We now have all cache related info, determine how we deal 1585 * with ordered requests. Note that as the current SCSI 1586 * dispatch function can alter request order, we cannot use 1587 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 1588 */ 1589 if (sdkp->WCE) 1590 ordered = sdkp->DPOFUA 1591 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 1592 else 1593 ordered = QUEUE_ORDERED_DRAIN; 1594 1595 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 1596 1597 set_capacity(disk, sdkp->capacity); 1598 kfree(buffer); 1599 1600 out: 1601 return 0; 1602 } 1603 1604 /** 1605 * sd_probe - called during driver initialization and whenever a 1606 * new scsi device is attached to the system. It is called once 1607 * for each scsi device (not just disks) present. 1608 * @dev: pointer to device object 1609 * 1610 * Returns 0 if successful (or not interested in this scsi device 1611 * (e.g. scanner)); 1 when there is an error. 1612 * 1613 * Note: this function is invoked from the scsi mid-level. 1614 * This function sets up the mapping between a given 1615 * <host,channel,id,lun> (found in sdp) and new device name 1616 * (e.g. /dev/sda). More precisely it is the block device major 1617 * and minor number that is chosen here. 1618 * 1619 * Assume sd_attach is not re-entrant (for time being) 1620 * Also think about sd_attach() and sd_remove() running coincidentally. 1621 **/ 1622 static int sd_probe(struct device *dev) 1623 { 1624 struct scsi_device *sdp = to_scsi_device(dev); 1625 struct scsi_disk *sdkp; 1626 struct gendisk *gd; 1627 u32 index; 1628 int error; 1629 1630 error = -ENODEV; 1631 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 1632 goto out; 1633 1634 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 1635 "sd_attach\n")); 1636 1637 error = -ENOMEM; 1638 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 1639 if (!sdkp) 1640 goto out; 1641 1642 gd = alloc_disk(16); 1643 if (!gd) 1644 goto out_free; 1645 1646 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) 1647 goto out_put; 1648 1649 spin_lock(&sd_index_lock); 1650 error = idr_get_new(&sd_index_idr, NULL, &index); 1651 spin_unlock(&sd_index_lock); 1652 1653 if (index >= SD_MAX_DISKS) 1654 error = -EBUSY; 1655 if (error) 1656 goto out_put; 1657 1658 sdkp->device = sdp; 1659 sdkp->driver = &sd_template; 1660 sdkp->disk = gd; 1661 sdkp->index = index; 1662 sdkp->openers = 0; 1663 sdkp->previous_state = 1; 1664 1665 if (!sdp->timeout) { 1666 if (sdp->type != TYPE_MOD) 1667 sdp->timeout = SD_TIMEOUT; 1668 else 1669 sdp->timeout = SD_MOD_TIMEOUT; 1670 } 1671 1672 device_initialize(&sdkp->dev); 1673 sdkp->dev.parent = &sdp->sdev_gendev; 1674 sdkp->dev.class = &sd_disk_class; 1675 strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); 1676 1677 if (device_add(&sdkp->dev)) 1678 goto out_put; 1679 1680 get_device(&sdp->sdev_gendev); 1681 1682 gd->major = sd_major((index & 0xf0) >> 4); 1683 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 1684 gd->minors = 16; 1685 gd->fops = &sd_fops; 1686 1687 if (index < 26) { 1688 sprintf(gd->disk_name, "sd%c", 'a' + index % 26); 1689 } else if (index < (26 + 1) * 26) { 1690 sprintf(gd->disk_name, "sd%c%c", 1691 'a' + index / 26 - 1,'a' + index % 26); 1692 } else { 1693 const unsigned int m1 = (index / 26 - 1) / 26 - 1; 1694 const unsigned int m2 = (index / 26 - 1) % 26; 1695 const unsigned int m3 = index % 26; 1696 sprintf(gd->disk_name, "sd%c%c%c", 1697 'a' + m1, 'a' + m2, 'a' + m3); 1698 } 1699 1700 gd->private_data = &sdkp->driver; 1701 gd->queue = sdkp->device->request_queue; 1702 1703 sd_revalidate_disk(gd); 1704 1705 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 1706 1707 gd->driverfs_dev = &sdp->sdev_gendev; 1708 gd->flags = GENHD_FL_DRIVERFS; 1709 if (sdp->removable) 1710 gd->flags |= GENHD_FL_REMOVABLE; 1711 1712 dev_set_drvdata(dev, sdkp); 1713 add_disk(gd); 1714 1715 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 1716 sdp->removable ? "removable " : ""); 1717 1718 return 0; 1719 1720 out_put: 1721 put_disk(gd); 1722 out_free: 1723 kfree(sdkp); 1724 out: 1725 return error; 1726 } 1727 1728 /** 1729 * sd_remove - called whenever a scsi disk (previously recognized by 1730 * sd_probe) is detached from the system. It is called (potentially 1731 * multiple times) during sd module unload. 1732 * @sdp: pointer to mid level scsi device object 1733 * 1734 * Note: this function is invoked from the scsi mid-level. 1735 * This function potentially frees up a device name (e.g. /dev/sdc) 1736 * that could be re-used by a subsequent sd_probe(). 1737 * This function is not called when the built-in sd driver is "exit-ed". 1738 **/ 1739 static int sd_remove(struct device *dev) 1740 { 1741 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1742 1743 device_del(&sdkp->dev); 1744 del_gendisk(sdkp->disk); 1745 sd_shutdown(dev); 1746 1747 mutex_lock(&sd_ref_mutex); 1748 dev_set_drvdata(dev, NULL); 1749 put_device(&sdkp->dev); 1750 mutex_unlock(&sd_ref_mutex); 1751 1752 return 0; 1753 } 1754 1755 /** 1756 * scsi_disk_release - Called to free the scsi_disk structure 1757 * @dev: pointer to embedded class device 1758 * 1759 * sd_ref_mutex must be held entering this routine. Because it is 1760 * called on last put, you should always use the scsi_disk_get() 1761 * scsi_disk_put() helpers which manipulate the semaphore directly 1762 * and never do a direct put_device. 1763 **/ 1764 static void scsi_disk_release(struct device *dev) 1765 { 1766 struct scsi_disk *sdkp = to_scsi_disk(dev); 1767 struct gendisk *disk = sdkp->disk; 1768 1769 spin_lock(&sd_index_lock); 1770 idr_remove(&sd_index_idr, sdkp->index); 1771 spin_unlock(&sd_index_lock); 1772 1773 disk->private_data = NULL; 1774 put_disk(disk); 1775 put_device(&sdkp->device->sdev_gendev); 1776 1777 kfree(sdkp); 1778 } 1779 1780 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 1781 { 1782 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 1783 struct scsi_sense_hdr sshdr; 1784 struct scsi_device *sdp = sdkp->device; 1785 int res; 1786 1787 if (start) 1788 cmd[4] |= 1; /* START */ 1789 1790 if (sdp->start_stop_pwr_cond) 1791 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 1792 1793 if (!scsi_device_online(sdp)) 1794 return -ENODEV; 1795 1796 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1797 SD_TIMEOUT, SD_MAX_RETRIES); 1798 if (res) { 1799 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 1800 sd_print_result(sdkp, res); 1801 if (driver_byte(res) & DRIVER_SENSE) 1802 sd_print_sense_hdr(sdkp, &sshdr); 1803 } 1804 1805 return res; 1806 } 1807 1808 /* 1809 * Send a SYNCHRONIZE CACHE instruction down to the device through 1810 * the normal SCSI command structure. Wait for the command to 1811 * complete. 1812 */ 1813 static void sd_shutdown(struct device *dev) 1814 { 1815 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1816 1817 if (!sdkp) 1818 return; /* this can happen */ 1819 1820 if (sdkp->WCE) { 1821 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1822 sd_sync_cache(sdkp); 1823 } 1824 1825 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 1826 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1827 sd_start_stop_device(sdkp, 0); 1828 } 1829 1830 scsi_disk_put(sdkp); 1831 } 1832 1833 static int sd_suspend(struct device *dev, pm_message_t mesg) 1834 { 1835 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1836 int ret = 0; 1837 1838 if (!sdkp) 1839 return 0; /* this can happen */ 1840 1841 if (sdkp->WCE) { 1842 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1843 ret = sd_sync_cache(sdkp); 1844 if (ret) 1845 goto done; 1846 } 1847 1848 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 1849 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1850 ret = sd_start_stop_device(sdkp, 0); 1851 } 1852 1853 done: 1854 scsi_disk_put(sdkp); 1855 return ret; 1856 } 1857 1858 static int sd_resume(struct device *dev) 1859 { 1860 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1861 int ret = 0; 1862 1863 if (!sdkp->device->manage_start_stop) 1864 goto done; 1865 1866 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 1867 ret = sd_start_stop_device(sdkp, 1); 1868 1869 done: 1870 scsi_disk_put(sdkp); 1871 return ret; 1872 } 1873 1874 /** 1875 * init_sd - entry point for this driver (both when built in or when 1876 * a module). 1877 * 1878 * Note: this function registers this driver with the scsi mid-level. 1879 **/ 1880 static int __init init_sd(void) 1881 { 1882 int majors = 0, i, err; 1883 1884 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 1885 1886 for (i = 0; i < SD_MAJORS; i++) 1887 if (register_blkdev(sd_major(i), "sd") == 0) 1888 majors++; 1889 1890 if (!majors) 1891 return -ENODEV; 1892 1893 err = class_register(&sd_disk_class); 1894 if (err) 1895 goto err_out; 1896 1897 err = scsi_register_driver(&sd_template.gendrv); 1898 if (err) 1899 goto err_out_class; 1900 1901 return 0; 1902 1903 err_out_class: 1904 class_unregister(&sd_disk_class); 1905 err_out: 1906 for (i = 0; i < SD_MAJORS; i++) 1907 unregister_blkdev(sd_major(i), "sd"); 1908 return err; 1909 } 1910 1911 /** 1912 * exit_sd - exit point for this driver (when it is a module). 1913 * 1914 * Note: this function unregisters this driver from the scsi mid-level. 1915 **/ 1916 static void __exit exit_sd(void) 1917 { 1918 int i; 1919 1920 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 1921 1922 scsi_unregister_driver(&sd_template.gendrv); 1923 class_unregister(&sd_disk_class); 1924 1925 for (i = 0; i < SD_MAJORS; i++) 1926 unregister_blkdev(sd_major(i), "sd"); 1927 } 1928 1929 module_init(init_sd); 1930 module_exit(exit_sd); 1931 1932 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 1933 struct scsi_sense_hdr *sshdr) 1934 { 1935 sd_printk(KERN_INFO, sdkp, ""); 1936 scsi_show_sense_hdr(sshdr); 1937 sd_printk(KERN_INFO, sdkp, ""); 1938 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 1939 } 1940 1941 static void sd_print_result(struct scsi_disk *sdkp, int result) 1942 { 1943 sd_printk(KERN_INFO, sdkp, ""); 1944 scsi_show_result(result); 1945 } 1946 1947