sd.c revision a0899d4df534d2bcf671b0f647b809842309a9ae
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#include <scsi/sd.h> 62 63#include "scsi_logging.h" 64 65MODULE_AUTHOR("Eric Youngdale"); 66MODULE_DESCRIPTION("SCSI disk (sd) driver"); 67MODULE_LICENSE("GPL"); 68 69MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 70MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 71MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 85MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 86MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 87MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 88 89static int sd_revalidate_disk(struct gendisk *); 90static int sd_probe(struct device *); 91static int sd_remove(struct device *); 92static void sd_shutdown(struct device *); 93static int sd_suspend(struct device *, pm_message_t state); 94static int sd_resume(struct device *); 95static void sd_rescan(struct device *); 96static int sd_done(struct scsi_cmnd *); 97static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 98static void scsi_disk_release(struct class_device *cdev); 99static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 100static void sd_print_result(struct scsi_disk *, int); 101 102static DEFINE_IDR(sd_index_idr); 103static 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) */ 108static DEFINE_MUTEX(sd_ref_mutex); 109 110static const char *sd_cache_types[] = { 111 "write through", "none", "write back", 112 "write back, no read (daft)" 113}; 114 115static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, 116 size_t count) 117{ 118 int i, ct = -1, rcd, wce, sp; 119 struct scsi_disk *sdkp = to_scsi_disk(cdev); 120 struct scsi_device *sdp = sdkp->device; 121 char buffer[64]; 122 char *buffer_data; 123 struct scsi_mode_data data; 124 struct scsi_sense_hdr sshdr; 125 int len; 126 127 if (sdp->type != TYPE_DISK) 128 /* no cache control on RBC devices; theoretically they 129 * can do it, but there's probably so many exceptions 130 * it's not worth the risk */ 131 return -EINVAL; 132 133 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 134 const int len = strlen(sd_cache_types[i]); 135 if (strncmp(sd_cache_types[i], buf, len) == 0 && 136 buf[len] == '\n') { 137 ct = i; 138 break; 139 } 140 } 141 if (ct < 0) 142 return -EINVAL; 143 rcd = ct & 0x01 ? 1 : 0; 144 wce = ct & 0x02 ? 1 : 0; 145 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 146 SD_MAX_RETRIES, &data, NULL)) 147 return -EINVAL; 148 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 149 data.block_descriptor_length); 150 buffer_data = buffer + data.header_length + 151 data.block_descriptor_length; 152 buffer_data[2] &= ~0x05; 153 buffer_data[2] |= wce << 2 | rcd; 154 sp = buffer_data[0] & 0x80 ? 1 : 0; 155 156 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 157 SD_MAX_RETRIES, &data, &sshdr)) { 158 if (scsi_sense_valid(&sshdr)) 159 sd_print_sense_hdr(sdkp, &sshdr); 160 return -EINVAL; 161 } 162 sd_revalidate_disk(sdkp->disk); 163 return count; 164} 165 166static ssize_t sd_store_manage_start_stop(struct class_device *cdev, 167 const char *buf, size_t count) 168{ 169 struct scsi_disk *sdkp = to_scsi_disk(cdev); 170 struct scsi_device *sdp = sdkp->device; 171 172 if (!capable(CAP_SYS_ADMIN)) 173 return -EACCES; 174 175 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 176 177 return count; 178} 179 180static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, 181 size_t count) 182{ 183 struct scsi_disk *sdkp = to_scsi_disk(cdev); 184 struct scsi_device *sdp = sdkp->device; 185 186 if (!capable(CAP_SYS_ADMIN)) 187 return -EACCES; 188 189 if (sdp->type != TYPE_DISK) 190 return -EINVAL; 191 192 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 193 194 return count; 195} 196 197static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) 198{ 199 struct scsi_disk *sdkp = to_scsi_disk(cdev); 200 int ct = sdkp->RCD + 2*sdkp->WCE; 201 202 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 203} 204 205static ssize_t sd_show_fua(struct class_device *cdev, char *buf) 206{ 207 struct scsi_disk *sdkp = to_scsi_disk(cdev); 208 209 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 210} 211 212static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf) 213{ 214 struct scsi_disk *sdkp = to_scsi_disk(cdev); 215 struct scsi_device *sdp = sdkp->device; 216 217 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 218} 219 220static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) 221{ 222 struct scsi_disk *sdkp = to_scsi_disk(cdev); 223 224 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 225} 226 227static struct class_device_attribute sd_disk_attrs[] = { 228 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 229 sd_store_cache_type), 230 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 231 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 232 sd_store_allow_restart), 233 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 234 sd_store_manage_start_stop), 235 __ATTR_NULL, 236}; 237 238static struct class sd_disk_class = { 239 .name = "scsi_disk", 240 .owner = THIS_MODULE, 241 .release = scsi_disk_release, 242 .class_dev_attrs = sd_disk_attrs, 243}; 244 245static struct scsi_driver sd_template = { 246 .owner = THIS_MODULE, 247 .gendrv = { 248 .name = "sd", 249 .probe = sd_probe, 250 .remove = sd_remove, 251 .suspend = sd_suspend, 252 .resume = sd_resume, 253 .shutdown = sd_shutdown, 254 }, 255 .rescan = sd_rescan, 256 .done = sd_done, 257}; 258 259/* 260 * Device no to disk mapping: 261 * 262 * major disc2 disc p1 263 * |............|.............|....|....| <- dev_t 264 * 31 20 19 8 7 4 3 0 265 * 266 * Inside a major, we have 16k disks, however mapped non- 267 * contiguously. The first 16 disks are for major0, the next 268 * ones with major1, ... Disk 256 is for major0 again, disk 272 269 * for major1, ... 270 * As we stay compatible with our numbering scheme, we can reuse 271 * the well-know SCSI majors 8, 65--71, 136--143. 272 */ 273static int sd_major(int major_idx) 274{ 275 switch (major_idx) { 276 case 0: 277 return SCSI_DISK0_MAJOR; 278 case 1 ... 7: 279 return SCSI_DISK1_MAJOR + major_idx - 1; 280 case 8 ... 15: 281 return SCSI_DISK8_MAJOR + major_idx - 8; 282 default: 283 BUG(); 284 return 0; /* shut up gcc */ 285 } 286} 287 288static inline struct scsi_disk *scsi_disk(struct gendisk *disk) 289{ 290 return container_of(disk->private_data, struct scsi_disk, driver); 291} 292 293static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 294{ 295 struct scsi_disk *sdkp = NULL; 296 297 if (disk->private_data) { 298 sdkp = scsi_disk(disk); 299 if (scsi_device_get(sdkp->device) == 0) 300 class_device_get(&sdkp->cdev); 301 else 302 sdkp = NULL; 303 } 304 return sdkp; 305} 306 307static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 308{ 309 struct scsi_disk *sdkp; 310 311 mutex_lock(&sd_ref_mutex); 312 sdkp = __scsi_disk_get(disk); 313 mutex_unlock(&sd_ref_mutex); 314 return sdkp; 315} 316 317static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 318{ 319 struct scsi_disk *sdkp; 320 321 mutex_lock(&sd_ref_mutex); 322 sdkp = dev_get_drvdata(dev); 323 if (sdkp) 324 sdkp = __scsi_disk_get(sdkp->disk); 325 mutex_unlock(&sd_ref_mutex); 326 return sdkp; 327} 328 329static void scsi_disk_put(struct scsi_disk *sdkp) 330{ 331 struct scsi_device *sdev = sdkp->device; 332 333 mutex_lock(&sd_ref_mutex); 334 class_device_put(&sdkp->cdev); 335 scsi_device_put(sdev); 336 mutex_unlock(&sd_ref_mutex); 337} 338 339/** 340 * sd_init_command - build a scsi (read or write) command from 341 * information in the request structure. 342 * @SCpnt: pointer to mid-level's per scsi command structure that 343 * contains request and into which the scsi command is written 344 * 345 * Returns 1 if successful and 0 if error (or cannot be done now). 346 **/ 347static int sd_prep_fn(struct request_queue *q, struct request *rq) 348{ 349 struct scsi_cmnd *SCpnt; 350 struct scsi_device *sdp = q->queuedata; 351 struct gendisk *disk = rq->rq_disk; 352 sector_t block = rq->sector; 353 unsigned int this_count = rq->nr_sectors; 354 unsigned int timeout = sdp->timeout; 355 int ret; 356 357 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 358 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 359 goto out; 360 } else if (rq->cmd_type != REQ_TYPE_FS) { 361 ret = BLKPREP_KILL; 362 goto out; 363 } 364 ret = scsi_setup_fs_cmnd(sdp, rq); 365 if (ret != BLKPREP_OK) 366 goto out; 367 SCpnt = rq->special; 368 369 /* from here on until we're complete, any goto out 370 * is used for a killable error condition */ 371 ret = BLKPREP_KILL; 372 373 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 374 "sd_init_command: block=%llu, " 375 "count=%d\n", 376 (unsigned long long)block, 377 this_count)); 378 379 if (!sdp || !scsi_device_online(sdp) || 380 block + rq->nr_sectors > get_capacity(disk)) { 381 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 382 "Finishing %ld sectors\n", 383 rq->nr_sectors)); 384 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 385 "Retry with 0x%p\n", SCpnt)); 386 goto out; 387 } 388 389 if (sdp->changed) { 390 /* 391 * quietly refuse to do anything to a changed disc until 392 * the changed bit has been reset 393 */ 394 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 395 goto out; 396 } 397 398 /* 399 * Some devices (some sdcards for one) don't like it if the 400 * last sector gets read in a larger then 1 sector read. 401 */ 402 if (unlikely(sdp->last_sector_bug && 403 rq->nr_sectors > sdp->sector_size / 512 && 404 block + this_count == get_capacity(disk))) 405 this_count -= sdp->sector_size / 512; 406 407 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 408 (unsigned long long)block)); 409 410 /* 411 * If we have a 1K hardware sectorsize, prevent access to single 412 * 512 byte sectors. In theory we could handle this - in fact 413 * the scsi cdrom driver must be able to handle this because 414 * we typically use 1K blocksizes, and cdroms typically have 415 * 2K hardware sectorsizes. Of course, things are simpler 416 * with the cdrom, since it is read-only. For performance 417 * reasons, the filesystems should be able to handle this 418 * and not force the scsi disk driver to use bounce buffers 419 * for this. 420 */ 421 if (sdp->sector_size == 1024) { 422 if ((block & 1) || (rq->nr_sectors & 1)) { 423 scmd_printk(KERN_ERR, SCpnt, 424 "Bad block number requested\n"); 425 goto out; 426 } else { 427 block = block >> 1; 428 this_count = this_count >> 1; 429 } 430 } 431 if (sdp->sector_size == 2048) { 432 if ((block & 3) || (rq->nr_sectors & 3)) { 433 scmd_printk(KERN_ERR, SCpnt, 434 "Bad block number requested\n"); 435 goto out; 436 } else { 437 block = block >> 2; 438 this_count = this_count >> 2; 439 } 440 } 441 if (sdp->sector_size == 4096) { 442 if ((block & 7) || (rq->nr_sectors & 7)) { 443 scmd_printk(KERN_ERR, SCpnt, 444 "Bad block number requested\n"); 445 goto out; 446 } else { 447 block = block >> 3; 448 this_count = this_count >> 3; 449 } 450 } 451 if (rq_data_dir(rq) == WRITE) { 452 if (!sdp->writeable) { 453 goto out; 454 } 455 SCpnt->cmnd[0] = WRITE_6; 456 SCpnt->sc_data_direction = DMA_TO_DEVICE; 457 } else if (rq_data_dir(rq) == READ) { 458 SCpnt->cmnd[0] = READ_6; 459 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 460 } else { 461 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 462 goto out; 463 } 464 465 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 466 "%s %d/%ld 512 byte blocks.\n", 467 (rq_data_dir(rq) == WRITE) ? 468 "writing" : "reading", this_count, 469 rq->nr_sectors)); 470 471 SCpnt->cmnd[1] = 0; 472 473 if (block > 0xffffffff) { 474 SCpnt->cmnd[0] += READ_16 - READ_6; 475 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 476 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 477 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 478 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 479 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 480 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 481 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 482 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 483 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 484 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 485 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 486 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 487 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 488 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 489 } else if ((this_count > 0xff) || (block > 0x1fffff) || 490 SCpnt->device->use_10_for_rw) { 491 if (this_count > 0xffff) 492 this_count = 0xffff; 493 494 SCpnt->cmnd[0] += READ_10 - READ_6; 495 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 496 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 497 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 498 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 499 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 500 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 501 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 502 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 503 } else { 504 if (unlikely(blk_fua_rq(rq))) { 505 /* 506 * This happens only if this drive failed 507 * 10byte rw command with ILLEGAL_REQUEST 508 * during operation and thus turned off 509 * use_10_for_rw. 510 */ 511 scmd_printk(KERN_ERR, SCpnt, 512 "FUA write on READ/WRITE(6) drive\n"); 513 goto out; 514 } 515 516 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 517 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 518 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 519 SCpnt->cmnd[4] = (unsigned char) this_count; 520 SCpnt->cmnd[5] = 0; 521 } 522 SCpnt->request_bufflen = this_count * sdp->sector_size; 523 524 /* 525 * We shouldn't disconnect in the middle of a sector, so with a dumb 526 * host adapter, it's safe to assume that we can at least transfer 527 * this many bytes between each connect / disconnect. 528 */ 529 SCpnt->transfersize = sdp->sector_size; 530 SCpnt->underflow = this_count << 9; 531 SCpnt->allowed = SD_MAX_RETRIES; 532 SCpnt->timeout_per_command = timeout; 533 534 /* 535 * This indicates that the command is ready from our end to be 536 * queued. 537 */ 538 ret = BLKPREP_OK; 539 out: 540 return scsi_prep_return(q, rq, ret); 541} 542 543/** 544 * sd_open - open a scsi disk device 545 * @inode: only i_rdev member may be used 546 * @filp: only f_mode and f_flags may be used 547 * 548 * Returns 0 if successful. Returns a negated errno value in case 549 * of error. 550 * 551 * Note: This can be called from a user context (e.g. fsck(1) ) 552 * or from within the kernel (e.g. as a result of a mount(1) ). 553 * In the latter case @inode and @filp carry an abridged amount 554 * of information as noted above. 555 **/ 556static int sd_open(struct inode *inode, struct file *filp) 557{ 558 struct gendisk *disk = inode->i_bdev->bd_disk; 559 struct scsi_disk *sdkp; 560 struct scsi_device *sdev; 561 int retval; 562 563 if (!(sdkp = scsi_disk_get(disk))) 564 return -ENXIO; 565 566 567 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 568 569 sdev = sdkp->device; 570 571 /* 572 * If the device is in error recovery, wait until it is done. 573 * If the device is offline, then disallow any access to it. 574 */ 575 retval = -ENXIO; 576 if (!scsi_block_when_processing_errors(sdev)) 577 goto error_out; 578 579 if (sdev->removable || sdkp->write_prot) 580 check_disk_change(inode->i_bdev); 581 582 /* 583 * If the drive is empty, just let the open fail. 584 */ 585 retval = -ENOMEDIUM; 586 if (sdev->removable && !sdkp->media_present && 587 !(filp->f_flags & O_NDELAY)) 588 goto error_out; 589 590 /* 591 * If the device has the write protect tab set, have the open fail 592 * if the user expects to be able to write to the thing. 593 */ 594 retval = -EROFS; 595 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) 596 goto error_out; 597 598 /* 599 * It is possible that the disk changing stuff resulted in 600 * the device being taken offline. If this is the case, 601 * report this to the user, and don't pretend that the 602 * open actually succeeded. 603 */ 604 retval = -ENXIO; 605 if (!scsi_device_online(sdev)) 606 goto error_out; 607 608 if (!sdkp->openers++ && sdev->removable) { 609 if (scsi_block_when_processing_errors(sdev)) 610 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 611 } 612 613 return 0; 614 615error_out: 616 scsi_disk_put(sdkp); 617 return retval; 618} 619 620/** 621 * sd_release - invoked when the (last) close(2) is called on this 622 * scsi disk. 623 * @inode: only i_rdev member may be used 624 * @filp: only f_mode and f_flags may be used 625 * 626 * Returns 0. 627 * 628 * Note: may block (uninterruptible) if error recovery is underway 629 * on this disk. 630 **/ 631static int sd_release(struct inode *inode, struct file *filp) 632{ 633 struct gendisk *disk = inode->i_bdev->bd_disk; 634 struct scsi_disk *sdkp = scsi_disk(disk); 635 struct scsi_device *sdev = sdkp->device; 636 637 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 638 639 if (!--sdkp->openers && sdev->removable) { 640 if (scsi_block_when_processing_errors(sdev)) 641 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 642 } 643 644 /* 645 * XXX and what if there are packets in flight and this close() 646 * XXX is followed by a "rmmod sd_mod"? 647 */ 648 scsi_disk_put(sdkp); 649 return 0; 650} 651 652static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 653{ 654 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 655 struct scsi_device *sdp = sdkp->device; 656 struct Scsi_Host *host = sdp->host; 657 int diskinfo[4]; 658 659 /* default to most commonly used values */ 660 diskinfo[0] = 0x40; /* 1 << 6 */ 661 diskinfo[1] = 0x20; /* 1 << 5 */ 662 diskinfo[2] = sdkp->capacity >> 11; 663 664 /* override with calculated, extended default, or driver values */ 665 if (host->hostt->bios_param) 666 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 667 else 668 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 669 670 geo->heads = diskinfo[0]; 671 geo->sectors = diskinfo[1]; 672 geo->cylinders = diskinfo[2]; 673 return 0; 674} 675 676/** 677 * sd_ioctl - process an ioctl 678 * @inode: only i_rdev/i_bdev members may be used 679 * @filp: only f_mode and f_flags may be used 680 * @cmd: ioctl command number 681 * @arg: this is third argument given to ioctl(2) system call. 682 * Often contains a pointer. 683 * 684 * Returns 0 if successful (some ioctls return postive numbers on 685 * success as well). Returns a negated errno value in case of error. 686 * 687 * Note: most ioctls are forward onto the block subsystem or further 688 * down in the scsi subsystem. 689 **/ 690static int sd_ioctl(struct inode * inode, struct file * filp, 691 unsigned int cmd, unsigned long arg) 692{ 693 struct block_device *bdev = inode->i_bdev; 694 struct gendisk *disk = bdev->bd_disk; 695 struct scsi_device *sdp = scsi_disk(disk)->device; 696 void __user *p = (void __user *)arg; 697 int error; 698 699 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 700 disk->disk_name, cmd)); 701 702 /* 703 * If we are in the middle of error recovery, don't let anyone 704 * else try and use this device. Also, if error recovery fails, it 705 * may try and take the device offline, in which case all further 706 * access to the device is prohibited. 707 */ 708 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); 709 if (!scsi_block_when_processing_errors(sdp) || !error) 710 return error; 711 712 /* 713 * Send SCSI addressing ioctls directly to mid level, send other 714 * ioctls to block level and then onto mid level if they can't be 715 * resolved. 716 */ 717 switch (cmd) { 718 case SCSI_IOCTL_GET_IDLUN: 719 case SCSI_IOCTL_GET_BUS_NUMBER: 720 return scsi_ioctl(sdp, cmd, p); 721 default: 722 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p); 723 if (error != -ENOTTY) 724 return error; 725 } 726 return scsi_ioctl(sdp, cmd, p); 727} 728 729static void set_media_not_present(struct scsi_disk *sdkp) 730{ 731 sdkp->media_present = 0; 732 sdkp->capacity = 0; 733 sdkp->device->changed = 1; 734} 735 736/** 737 * sd_media_changed - check if our medium changed 738 * @disk: kernel device descriptor 739 * 740 * Returns 0 if not applicable or no change; 1 if change 741 * 742 * Note: this function is invoked from the block subsystem. 743 **/ 744static int sd_media_changed(struct gendisk *disk) 745{ 746 struct scsi_disk *sdkp = scsi_disk(disk); 747 struct scsi_device *sdp = sdkp->device; 748 struct scsi_sense_hdr *sshdr = NULL; 749 int retval; 750 751 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 752 753 if (!sdp->removable) 754 return 0; 755 756 /* 757 * If the device is offline, don't send any commands - just pretend as 758 * if the command failed. If the device ever comes back online, we 759 * can deal with it then. It is only because of unrecoverable errors 760 * that we would ever take a device offline in the first place. 761 */ 762 if (!scsi_device_online(sdp)) { 763 set_media_not_present(sdkp); 764 retval = 1; 765 goto out; 766 } 767 768 /* 769 * Using TEST_UNIT_READY enables differentiation between drive with 770 * no cartridge loaded - NOT READY, drive with changed cartridge - 771 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 772 * 773 * Drives that auto spin down. eg iomega jaz 1G, will be started 774 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 775 * sd_revalidate() is called. 776 */ 777 retval = -ENODEV; 778 779 if (scsi_block_when_processing_errors(sdp)) { 780 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 781 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 782 sshdr); 783 } 784 785 /* 786 * Unable to test, unit probably not ready. This usually 787 * means there is no disc in the drive. Mark as changed, 788 * and we will figure it out later once the drive is 789 * available again. 790 */ 791 if (retval || (scsi_sense_valid(sshdr) && 792 /* 0x3a is medium not present */ 793 sshdr->asc == 0x3a)) { 794 set_media_not_present(sdkp); 795 retval = 1; 796 goto out; 797 } 798 799 /* 800 * For removable scsi disk we have to recognise the presence 801 * of a disk in the drive. This is kept in the struct scsi_disk 802 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 803 */ 804 sdkp->media_present = 1; 805 806 retval = sdp->changed; 807 sdp->changed = 0; 808out: 809 if (retval != sdkp->previous_state) 810 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 811 sdkp->previous_state = retval; 812 kfree(sshdr); 813 return retval; 814} 815 816static int sd_sync_cache(struct scsi_disk *sdkp) 817{ 818 int retries, res; 819 struct scsi_device *sdp = sdkp->device; 820 struct scsi_sense_hdr sshdr; 821 822 if (!scsi_device_online(sdp)) 823 return -ENODEV; 824 825 826 for (retries = 3; retries > 0; --retries) { 827 unsigned char cmd[10] = { 0 }; 828 829 cmd[0] = SYNCHRONIZE_CACHE; 830 /* 831 * Leave the rest of the command zero to indicate 832 * flush everything. 833 */ 834 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 835 SD_TIMEOUT, SD_MAX_RETRIES); 836 if (res == 0) 837 break; 838 } 839 840 if (res) { 841 sd_print_result(sdkp, res); 842 if (driver_byte(res) & DRIVER_SENSE) 843 sd_print_sense_hdr(sdkp, &sshdr); 844 } 845 846 if (res) 847 return -EIO; 848 return 0; 849} 850 851static void sd_prepare_flush(struct request_queue *q, struct request *rq) 852{ 853 memset(rq->cmd, 0, sizeof(rq->cmd)); 854 rq->cmd_type = REQ_TYPE_BLOCK_PC; 855 rq->timeout = SD_TIMEOUT; 856 rq->cmd[0] = SYNCHRONIZE_CACHE; 857 rq->cmd_len = 10; 858} 859 860static void sd_rescan(struct device *dev) 861{ 862 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 863 864 if (sdkp) { 865 sd_revalidate_disk(sdkp->disk); 866 scsi_disk_put(sdkp); 867 } 868} 869 870 871#ifdef CONFIG_COMPAT 872/* 873 * This gets directly called from VFS. When the ioctl 874 * is not recognized we go back to the other translation paths. 875 */ 876static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 877{ 878 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; 879 struct gendisk *disk = bdev->bd_disk; 880 struct scsi_device *sdev = scsi_disk(disk)->device; 881 882 /* 883 * If we are in the middle of error recovery, don't let anyone 884 * else try and use this device. Also, if error recovery fails, it 885 * may try and take the device offline, in which case all further 886 * access to the device is prohibited. 887 */ 888 if (!scsi_block_when_processing_errors(sdev)) 889 return -ENODEV; 890 891 if (sdev->host->hostt->compat_ioctl) { 892 int ret; 893 894 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 895 896 return ret; 897 } 898 899 /* 900 * Let the static ioctl translation table take care of it. 901 */ 902 return -ENOIOCTLCMD; 903} 904#endif 905 906static struct block_device_operations sd_fops = { 907 .owner = THIS_MODULE, 908 .open = sd_open, 909 .release = sd_release, 910 .ioctl = sd_ioctl, 911 .getgeo = sd_getgeo, 912#ifdef CONFIG_COMPAT 913 .compat_ioctl = sd_compat_ioctl, 914#endif 915 .media_changed = sd_media_changed, 916 .revalidate_disk = sd_revalidate_disk, 917}; 918 919/** 920 * sd_done - bottom half handler: called when the lower level 921 * driver has completed (successfully or otherwise) a scsi command. 922 * @SCpnt: mid-level's per command structure. 923 * 924 * Note: potentially run from within an ISR. Must not block. 925 **/ 926static int sd_done(struct scsi_cmnd *SCpnt) 927{ 928 int result = SCpnt->result; 929 unsigned int xfer_size = SCpnt->request_bufflen; 930 unsigned int good_bytes = result ? 0 : xfer_size; 931 u64 start_lba = SCpnt->request->sector; 932 u64 bad_lba; 933 struct scsi_sense_hdr sshdr; 934 int sense_valid = 0; 935 int sense_deferred = 0; 936 int info_valid; 937 938 if (result) { 939 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 940 if (sense_valid) 941 sense_deferred = scsi_sense_is_deferred(&sshdr); 942 } 943#ifdef CONFIG_SCSI_LOGGING 944 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 945 if (sense_valid) { 946 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 947 "sd_done: sb[respc,sk,asc," 948 "ascq]=%x,%x,%x,%x\n", 949 sshdr.response_code, 950 sshdr.sense_key, sshdr.asc, 951 sshdr.ascq)); 952 } 953#endif 954 if (driver_byte(result) != DRIVER_SENSE && 955 (!sense_valid || sense_deferred)) 956 goto out; 957 958 switch (sshdr.sense_key) { 959 case HARDWARE_ERROR: 960 case MEDIUM_ERROR: 961 if (!blk_fs_request(SCpnt->request)) 962 goto out; 963 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, 964 SCSI_SENSE_BUFFERSIZE, 965 &bad_lba); 966 if (!info_valid) 967 goto out; 968 if (xfer_size <= SCpnt->device->sector_size) 969 goto out; 970 switch (SCpnt->device->sector_size) { 971 case 256: 972 start_lba <<= 1; 973 break; 974 case 512: 975 break; 976 case 1024: 977 start_lba >>= 1; 978 break; 979 case 2048: 980 start_lba >>= 2; 981 break; 982 case 4096: 983 start_lba >>= 3; 984 break; 985 default: 986 /* Print something here with limiting frequency. */ 987 goto out; 988 break; 989 } 990 /* This computation should always be done in terms of 991 * the resolution of the device's medium. 992 */ 993 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; 994 break; 995 case RECOVERED_ERROR: 996 case NO_SENSE: 997 /* Inform the user, but make sure that it's not treated 998 * as a hard error. 999 */ 1000 scsi_print_sense("sd", SCpnt); 1001 SCpnt->result = 0; 1002 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1003 good_bytes = xfer_size; 1004 break; 1005 case ILLEGAL_REQUEST: 1006 if (SCpnt->device->use_10_for_rw && 1007 (SCpnt->cmnd[0] == READ_10 || 1008 SCpnt->cmnd[0] == WRITE_10)) 1009 SCpnt->device->use_10_for_rw = 0; 1010 if (SCpnt->device->use_10_for_ms && 1011 (SCpnt->cmnd[0] == MODE_SENSE_10 || 1012 SCpnt->cmnd[0] == MODE_SELECT_10)) 1013 SCpnt->device->use_10_for_ms = 0; 1014 break; 1015 default: 1016 break; 1017 } 1018 out: 1019 return good_bytes; 1020} 1021 1022static int media_not_present(struct scsi_disk *sdkp, 1023 struct scsi_sense_hdr *sshdr) 1024{ 1025 1026 if (!scsi_sense_valid(sshdr)) 1027 return 0; 1028 /* not invoked for commands that could return deferred errors */ 1029 if (sshdr->sense_key != NOT_READY && 1030 sshdr->sense_key != UNIT_ATTENTION) 1031 return 0; 1032 if (sshdr->asc != 0x3A) /* medium not present */ 1033 return 0; 1034 1035 set_media_not_present(sdkp); 1036 return 1; 1037} 1038 1039/* 1040 * spinup disk - called only in sd_revalidate_disk() 1041 */ 1042static void 1043sd_spinup_disk(struct scsi_disk *sdkp) 1044{ 1045 unsigned char cmd[10]; 1046 unsigned long spintime_expire = 0; 1047 int retries, spintime; 1048 unsigned int the_result; 1049 struct scsi_sense_hdr sshdr; 1050 int sense_valid = 0; 1051 1052 spintime = 0; 1053 1054 /* Spin up drives, as required. Only do this at boot time */ 1055 /* Spinup needs to be done for module loads too. */ 1056 do { 1057 retries = 0; 1058 1059 do { 1060 cmd[0] = TEST_UNIT_READY; 1061 memset((void *) &cmd[1], 0, 9); 1062 1063 the_result = scsi_execute_req(sdkp->device, cmd, 1064 DMA_NONE, NULL, 0, 1065 &sshdr, SD_TIMEOUT, 1066 SD_MAX_RETRIES); 1067 1068 /* 1069 * If the drive has indicated to us that it 1070 * doesn't have any media in it, don't bother 1071 * with any more polling. 1072 */ 1073 if (media_not_present(sdkp, &sshdr)) 1074 return; 1075 1076 if (the_result) 1077 sense_valid = scsi_sense_valid(&sshdr); 1078 retries++; 1079 } while (retries < 3 && 1080 (!scsi_status_is_good(the_result) || 1081 ((driver_byte(the_result) & DRIVER_SENSE) && 1082 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1083 1084 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1085 /* no sense, TUR either succeeded or failed 1086 * with a status error */ 1087 if(!spintime && !scsi_status_is_good(the_result)) { 1088 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1089 sd_print_result(sdkp, the_result); 1090 } 1091 break; 1092 } 1093 1094 /* 1095 * The device does not want the automatic start to be issued. 1096 */ 1097 if (sdkp->device->no_start_on_add) { 1098 break; 1099 } 1100 1101 /* 1102 * If manual intervention is required, or this is an 1103 * absent USB storage device, a spinup is meaningless. 1104 */ 1105 if (sense_valid && 1106 sshdr.sense_key == NOT_READY && 1107 sshdr.asc == 4 && sshdr.ascq == 3) { 1108 break; /* manual intervention required */ 1109 1110 /* 1111 * Issue command to spin up drive when not ready 1112 */ 1113 } else if (sense_valid && sshdr.sense_key == NOT_READY) { 1114 if (!spintime) { 1115 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1116 cmd[0] = START_STOP; 1117 cmd[1] = 1; /* Return immediately */ 1118 memset((void *) &cmd[2], 0, 8); 1119 cmd[4] = 1; /* Start spin cycle */ 1120 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1121 NULL, 0, &sshdr, 1122 SD_TIMEOUT, SD_MAX_RETRIES); 1123 spintime_expire = jiffies + 100 * HZ; 1124 spintime = 1; 1125 } 1126 /* Wait 1 second for next try */ 1127 msleep(1000); 1128 printk("."); 1129 1130 /* 1131 * Wait for USB flash devices with slow firmware. 1132 * Yes, this sense key/ASC combination shouldn't 1133 * occur here. It's characteristic of these devices. 1134 */ 1135 } else if (sense_valid && 1136 sshdr.sense_key == UNIT_ATTENTION && 1137 sshdr.asc == 0x28) { 1138 if (!spintime) { 1139 spintime_expire = jiffies + 5 * HZ; 1140 spintime = 1; 1141 } 1142 /* Wait 1 second for next try */ 1143 msleep(1000); 1144 } else { 1145 /* we don't understand the sense code, so it's 1146 * probably pointless to loop */ 1147 if(!spintime) { 1148 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1149 sd_print_sense_hdr(sdkp, &sshdr); 1150 } 1151 break; 1152 } 1153 1154 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1155 1156 if (spintime) { 1157 if (scsi_status_is_good(the_result)) 1158 printk("ready\n"); 1159 else 1160 printk("not responding...\n"); 1161 } 1162} 1163 1164/* 1165 * read disk capacity 1166 */ 1167static void 1168sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1169{ 1170 unsigned char cmd[16]; 1171 int the_result, retries; 1172 int sector_size = 0; 1173 int longrc = 0; 1174 struct scsi_sense_hdr sshdr; 1175 int sense_valid = 0; 1176 struct scsi_device *sdp = sdkp->device; 1177 1178repeat: 1179 retries = 3; 1180 do { 1181 if (longrc) { 1182 memset((void *) cmd, 0, 16); 1183 cmd[0] = SERVICE_ACTION_IN; 1184 cmd[1] = SAI_READ_CAPACITY_16; 1185 cmd[13] = 12; 1186 memset((void *) buffer, 0, 12); 1187 } else { 1188 cmd[0] = READ_CAPACITY; 1189 memset((void *) &cmd[1], 0, 9); 1190 memset((void *) buffer, 0, 8); 1191 } 1192 1193 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1194 buffer, longrc ? 12 : 8, &sshdr, 1195 SD_TIMEOUT, SD_MAX_RETRIES); 1196 1197 if (media_not_present(sdkp, &sshdr)) 1198 return; 1199 1200 if (the_result) 1201 sense_valid = scsi_sense_valid(&sshdr); 1202 retries--; 1203 1204 } while (the_result && retries); 1205 1206 if (the_result && !longrc) { 1207 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1208 sd_print_result(sdkp, the_result); 1209 if (driver_byte(the_result) & DRIVER_SENSE) 1210 sd_print_sense_hdr(sdkp, &sshdr); 1211 else 1212 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1213 1214 /* Set dirty bit for removable devices if not ready - 1215 * sometimes drives will not report this properly. */ 1216 if (sdp->removable && 1217 sense_valid && sshdr.sense_key == NOT_READY) 1218 sdp->changed = 1; 1219 1220 /* Either no media are present but the drive didn't tell us, 1221 or they are present but the read capacity command fails */ 1222 /* sdkp->media_present = 0; -- not always correct */ 1223 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1224 1225 return; 1226 } else if (the_result && longrc) { 1227 /* READ CAPACITY(16) has been failed */ 1228 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1229 sd_print_result(sdkp, the_result); 1230 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); 1231 1232 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1233 goto got_data; 1234 } 1235 1236 if (!longrc) { 1237 sector_size = (buffer[4] << 24) | 1238 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 1239 if (buffer[0] == 0xff && buffer[1] == 0xff && 1240 buffer[2] == 0xff && buffer[3] == 0xff) { 1241 if(sizeof(sdkp->capacity) > 4) { 1242 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1243 "Trying to use READ CAPACITY(16).\n"); 1244 longrc = 1; 1245 goto repeat; 1246 } 1247 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " 1248 "a kernel compiled with support for large " 1249 "block devices.\n"); 1250 sdkp->capacity = 0; 1251 goto got_data; 1252 } 1253 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | 1254 (buffer[1] << 16) | 1255 (buffer[2] << 8) | 1256 buffer[3]); 1257 } else { 1258 sdkp->capacity = 1 + (((u64)buffer[0] << 56) | 1259 ((u64)buffer[1] << 48) | 1260 ((u64)buffer[2] << 40) | 1261 ((u64)buffer[3] << 32) | 1262 ((sector_t)buffer[4] << 24) | 1263 ((sector_t)buffer[5] << 16) | 1264 ((sector_t)buffer[6] << 8) | 1265 (sector_t)buffer[7]); 1266 1267 sector_size = (buffer[8] << 24) | 1268 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; 1269 } 1270 1271 /* Some devices return the total number of sectors, not the 1272 * highest sector number. Make the necessary adjustment. */ 1273 if (sdp->fix_capacity) { 1274 --sdkp->capacity; 1275 1276 /* Some devices have version which report the correct sizes 1277 * and others which do not. We guess size according to a heuristic 1278 * and err on the side of lowering the capacity. */ 1279 } else { 1280 if (sdp->guess_capacity) 1281 if (sdkp->capacity & 0x01) /* odd sizes are odd */ 1282 --sdkp->capacity; 1283 } 1284 1285got_data: 1286 if (sector_size == 0) { 1287 sector_size = 512; 1288 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1289 "assuming 512.\n"); 1290 } 1291 1292 if (sector_size != 512 && 1293 sector_size != 1024 && 1294 sector_size != 2048 && 1295 sector_size != 4096 && 1296 sector_size != 256) { 1297 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1298 sector_size); 1299 /* 1300 * The user might want to re-format the drive with 1301 * a supported sectorsize. Once this happens, it 1302 * would be relatively trivial to set the thing up. 1303 * For this reason, we leave the thing in the table. 1304 */ 1305 sdkp->capacity = 0; 1306 /* 1307 * set a bogus sector size so the normal read/write 1308 * logic in the block layer will eventually refuse any 1309 * request on this device without tripping over power 1310 * of two sector size assumptions 1311 */ 1312 sector_size = 512; 1313 } 1314 { 1315 /* 1316 * The msdos fs needs to know the hardware sector size 1317 * So I have created this table. See ll_rw_blk.c 1318 * Jacques Gelinas (Jacques@solucorp.qc.ca) 1319 */ 1320 int hard_sector = sector_size; 1321 sector_t sz = (sdkp->capacity/2) * (hard_sector/256); 1322 struct request_queue *queue = sdp->request_queue; 1323 sector_t mb = sz; 1324 1325 blk_queue_hardsect_size(queue, hard_sector); 1326 /* avoid 64-bit division on 32-bit platforms */ 1327 sector_div(sz, 625); 1328 mb -= sz - 974; 1329 sector_div(mb, 1950); 1330 1331 sd_printk(KERN_NOTICE, sdkp, 1332 "%llu %d-byte hardware sectors (%llu MB)\n", 1333 (unsigned long long)sdkp->capacity, 1334 hard_sector, (unsigned long long)mb); 1335 } 1336 1337 /* Rescale capacity to 512-byte units */ 1338 if (sector_size == 4096) 1339 sdkp->capacity <<= 3; 1340 else if (sector_size == 2048) 1341 sdkp->capacity <<= 2; 1342 else if (sector_size == 1024) 1343 sdkp->capacity <<= 1; 1344 else if (sector_size == 256) 1345 sdkp->capacity >>= 1; 1346 1347 sdkp->device->sector_size = sector_size; 1348} 1349 1350/* called with buffer of length 512 */ 1351static inline int 1352sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1353 unsigned char *buffer, int len, struct scsi_mode_data *data, 1354 struct scsi_sense_hdr *sshdr) 1355{ 1356 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1357 SD_TIMEOUT, SD_MAX_RETRIES, data, 1358 sshdr); 1359} 1360 1361/* 1362 * read write protect setting, if possible - called only in sd_revalidate_disk() 1363 * called with buffer of length SD_BUF_SIZE 1364 */ 1365static void 1366sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1367{ 1368 int res; 1369 struct scsi_device *sdp = sdkp->device; 1370 struct scsi_mode_data data; 1371 1372 set_disk_ro(sdkp->disk, 0); 1373 if (sdp->skip_ms_page_3f) { 1374 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1375 return; 1376 } 1377 1378 if (sdp->use_192_bytes_for_3f) { 1379 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1380 } else { 1381 /* 1382 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1383 * We have to start carefully: some devices hang if we ask 1384 * for more than is available. 1385 */ 1386 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1387 1388 /* 1389 * Second attempt: ask for page 0 When only page 0 is 1390 * implemented, a request for page 3F may return Sense Key 1391 * 5: Illegal Request, Sense Code 24: Invalid field in 1392 * CDB. 1393 */ 1394 if (!scsi_status_is_good(res)) 1395 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1396 1397 /* 1398 * Third attempt: ask 255 bytes, as we did earlier. 1399 */ 1400 if (!scsi_status_is_good(res)) 1401 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1402 &data, NULL); 1403 } 1404 1405 if (!scsi_status_is_good(res)) { 1406 sd_printk(KERN_WARNING, sdkp, 1407 "Test WP failed, assume Write Enabled\n"); 1408 } else { 1409 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1410 set_disk_ro(sdkp->disk, sdkp->write_prot); 1411 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1412 sdkp->write_prot ? "on" : "off"); 1413 sd_printk(KERN_DEBUG, sdkp, 1414 "Mode Sense: %02x %02x %02x %02x\n", 1415 buffer[0], buffer[1], buffer[2], buffer[3]); 1416 } 1417} 1418 1419/* 1420 * sd_read_cache_type - called only from sd_revalidate_disk() 1421 * called with buffer of length SD_BUF_SIZE 1422 */ 1423static void 1424sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1425{ 1426 int len = 0, res; 1427 struct scsi_device *sdp = sdkp->device; 1428 1429 int dbd; 1430 int modepage; 1431 struct scsi_mode_data data; 1432 struct scsi_sense_hdr sshdr; 1433 1434 if (sdp->skip_ms_page_8) 1435 goto defaults; 1436 1437 if (sdp->type == TYPE_RBC) { 1438 modepage = 6; 1439 dbd = 8; 1440 } else { 1441 modepage = 8; 1442 dbd = 0; 1443 } 1444 1445 /* cautiously ask */ 1446 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1447 1448 if (!scsi_status_is_good(res)) 1449 goto bad_sense; 1450 1451 if (!data.header_length) { 1452 modepage = 6; 1453 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1454 } 1455 1456 /* that went OK, now ask for the proper length */ 1457 len = data.length; 1458 1459 /* 1460 * We're only interested in the first three bytes, actually. 1461 * But the data cache page is defined for the first 20. 1462 */ 1463 if (len < 3) 1464 goto bad_sense; 1465 if (len > 20) 1466 len = 20; 1467 1468 /* Take headers and block descriptors into account */ 1469 len += data.header_length + data.block_descriptor_length; 1470 if (len > SD_BUF_SIZE) 1471 goto bad_sense; 1472 1473 /* Get the data */ 1474 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1475 1476 if (scsi_status_is_good(res)) { 1477 int offset = data.header_length + data.block_descriptor_length; 1478 1479 if (offset >= SD_BUF_SIZE - 2) { 1480 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1481 goto defaults; 1482 } 1483 1484 if ((buffer[offset] & 0x3f) != modepage) { 1485 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1486 goto defaults; 1487 } 1488 1489 if (modepage == 8) { 1490 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1491 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1492 } else { 1493 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1494 sdkp->RCD = 0; 1495 } 1496 1497 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1498 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1499 sd_printk(KERN_NOTICE, sdkp, 1500 "Uses READ/WRITE(6), disabling FUA\n"); 1501 sdkp->DPOFUA = 0; 1502 } 1503 1504 sd_printk(KERN_NOTICE, sdkp, 1505 "Write cache: %s, read cache: %s, %s\n", 1506 sdkp->WCE ? "enabled" : "disabled", 1507 sdkp->RCD ? "disabled" : "enabled", 1508 sdkp->DPOFUA ? "supports DPO and FUA" 1509 : "doesn't support DPO or FUA"); 1510 1511 return; 1512 } 1513 1514bad_sense: 1515 if (scsi_sense_valid(&sshdr) && 1516 sshdr.sense_key == ILLEGAL_REQUEST && 1517 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1518 /* Invalid field in CDB */ 1519 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1520 else 1521 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1522 1523defaults: 1524 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1525 sdkp->WCE = 0; 1526 sdkp->RCD = 0; 1527 sdkp->DPOFUA = 0; 1528} 1529 1530/** 1531 * sd_revalidate_disk - called the first time a new disk is seen, 1532 * performs disk spin up, read_capacity, etc. 1533 * @disk: struct gendisk we care about 1534 **/ 1535static int sd_revalidate_disk(struct gendisk *disk) 1536{ 1537 struct scsi_disk *sdkp = scsi_disk(disk); 1538 struct scsi_device *sdp = sdkp->device; 1539 unsigned char *buffer; 1540 unsigned ordered; 1541 1542 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 1543 "sd_revalidate_disk\n")); 1544 1545 /* 1546 * If the device is offline, don't try and read capacity or any 1547 * of the other niceties. 1548 */ 1549 if (!scsi_device_online(sdp)) 1550 goto out; 1551 1552 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 1553 if (!buffer) { 1554 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 1555 "allocation failure.\n"); 1556 goto out; 1557 } 1558 1559 /* defaults, until the device tells us otherwise */ 1560 sdp->sector_size = 512; 1561 sdkp->capacity = 0; 1562 sdkp->media_present = 1; 1563 sdkp->write_prot = 0; 1564 sdkp->WCE = 0; 1565 sdkp->RCD = 0; 1566 1567 sd_spinup_disk(sdkp); 1568 1569 /* 1570 * Without media there is no reason to ask; moreover, some devices 1571 * react badly if we do. 1572 */ 1573 if (sdkp->media_present) { 1574 sd_read_capacity(sdkp, buffer); 1575 sd_read_write_protect_flag(sdkp, buffer); 1576 sd_read_cache_type(sdkp, buffer); 1577 } 1578 1579 /* 1580 * We now have all cache related info, determine how we deal 1581 * with ordered requests. Note that as the current SCSI 1582 * dispatch function can alter request order, we cannot use 1583 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 1584 */ 1585 if (sdkp->WCE) 1586 ordered = sdkp->DPOFUA 1587 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 1588 else 1589 ordered = QUEUE_ORDERED_DRAIN; 1590 1591 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 1592 1593 set_capacity(disk, sdkp->capacity); 1594 kfree(buffer); 1595 1596 out: 1597 return 0; 1598} 1599 1600/** 1601 * sd_probe - called during driver initialization and whenever a 1602 * new scsi device is attached to the system. It is called once 1603 * for each scsi device (not just disks) present. 1604 * @dev: pointer to device object 1605 * 1606 * Returns 0 if successful (or not interested in this scsi device 1607 * (e.g. scanner)); 1 when there is an error. 1608 * 1609 * Note: this function is invoked from the scsi mid-level. 1610 * This function sets up the mapping between a given 1611 * <host,channel,id,lun> (found in sdp) and new device name 1612 * (e.g. /dev/sda). More precisely it is the block device major 1613 * and minor number that is chosen here. 1614 * 1615 * Assume sd_attach is not re-entrant (for time being) 1616 * Also think about sd_attach() and sd_remove() running coincidentally. 1617 **/ 1618static int sd_probe(struct device *dev) 1619{ 1620 struct scsi_device *sdp = to_scsi_device(dev); 1621 struct scsi_disk *sdkp; 1622 struct gendisk *gd; 1623 u32 index; 1624 int error; 1625 1626 error = -ENODEV; 1627 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 1628 goto out; 1629 1630 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 1631 "sd_attach\n")); 1632 1633 error = -ENOMEM; 1634 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 1635 if (!sdkp) 1636 goto out; 1637 1638 gd = alloc_disk(16); 1639 if (!gd) 1640 goto out_free; 1641 1642 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) 1643 goto out_put; 1644 1645 spin_lock(&sd_index_lock); 1646 error = idr_get_new(&sd_index_idr, NULL, &index); 1647 spin_unlock(&sd_index_lock); 1648 1649 if (index >= SD_MAX_DISKS) 1650 error = -EBUSY; 1651 if (error) 1652 goto out_put; 1653 1654 sdkp->device = sdp; 1655 sdkp->driver = &sd_template; 1656 sdkp->disk = gd; 1657 sdkp->index = index; 1658 sdkp->openers = 0; 1659 1660 if (!sdp->timeout) { 1661 if (sdp->type != TYPE_MOD) 1662 sdp->timeout = SD_TIMEOUT; 1663 else 1664 sdp->timeout = SD_MOD_TIMEOUT; 1665 } 1666 1667 class_device_initialize(&sdkp->cdev); 1668 sdkp->cdev.dev = &sdp->sdev_gendev; 1669 sdkp->cdev.class = &sd_disk_class; 1670 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); 1671 1672 if (class_device_add(&sdkp->cdev)) 1673 goto out_put; 1674 1675 get_device(&sdp->sdev_gendev); 1676 1677 gd->major = sd_major((index & 0xf0) >> 4); 1678 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 1679 gd->minors = 16; 1680 gd->fops = &sd_fops; 1681 1682 if (index < 26) { 1683 sprintf(gd->disk_name, "sd%c", 'a' + index % 26); 1684 } else if (index < (26 + 1) * 26) { 1685 sprintf(gd->disk_name, "sd%c%c", 1686 'a' + index / 26 - 1,'a' + index % 26); 1687 } else { 1688 const unsigned int m1 = (index / 26 - 1) / 26 - 1; 1689 const unsigned int m2 = (index / 26 - 1) % 26; 1690 const unsigned int m3 = index % 26; 1691 sprintf(gd->disk_name, "sd%c%c%c", 1692 'a' + m1, 'a' + m2, 'a' + m3); 1693 } 1694 1695 gd->private_data = &sdkp->driver; 1696 gd->queue = sdkp->device->request_queue; 1697 1698 sd_revalidate_disk(gd); 1699 1700 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 1701 1702 gd->driverfs_dev = &sdp->sdev_gendev; 1703 gd->flags = GENHD_FL_DRIVERFS; 1704 if (sdp->removable) 1705 gd->flags |= GENHD_FL_REMOVABLE; 1706 1707 dev_set_drvdata(dev, sdkp); 1708 add_disk(gd); 1709 1710 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 1711 sdp->removable ? "removable " : ""); 1712 1713 return 0; 1714 1715 out_put: 1716 put_disk(gd); 1717 out_free: 1718 kfree(sdkp); 1719 out: 1720 return error; 1721} 1722 1723/** 1724 * sd_remove - called whenever a scsi disk (previously recognized by 1725 * sd_probe) is detached from the system. It is called (potentially 1726 * multiple times) during sd module unload. 1727 * @sdp: pointer to mid level scsi device object 1728 * 1729 * Note: this function is invoked from the scsi mid-level. 1730 * This function potentially frees up a device name (e.g. /dev/sdc) 1731 * that could be re-used by a subsequent sd_probe(). 1732 * This function is not called when the built-in sd driver is "exit-ed". 1733 **/ 1734static int sd_remove(struct device *dev) 1735{ 1736 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1737 1738 class_device_del(&sdkp->cdev); 1739 del_gendisk(sdkp->disk); 1740 sd_shutdown(dev); 1741 1742 mutex_lock(&sd_ref_mutex); 1743 dev_set_drvdata(dev, NULL); 1744 class_device_put(&sdkp->cdev); 1745 mutex_unlock(&sd_ref_mutex); 1746 1747 return 0; 1748} 1749 1750/** 1751 * scsi_disk_release - Called to free the scsi_disk structure 1752 * @cdev: pointer to embedded class device 1753 * 1754 * sd_ref_mutex must be held entering this routine. Because it is 1755 * called on last put, you should always use the scsi_disk_get() 1756 * scsi_disk_put() helpers which manipulate the semaphore directly 1757 * and never do a direct class_device_put(). 1758 **/ 1759static void scsi_disk_release(struct class_device *cdev) 1760{ 1761 struct scsi_disk *sdkp = to_scsi_disk(cdev); 1762 struct gendisk *disk = sdkp->disk; 1763 1764 spin_lock(&sd_index_lock); 1765 idr_remove(&sd_index_idr, sdkp->index); 1766 spin_unlock(&sd_index_lock); 1767 1768 disk->private_data = NULL; 1769 put_disk(disk); 1770 put_device(&sdkp->device->sdev_gendev); 1771 1772 kfree(sdkp); 1773} 1774 1775static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 1776{ 1777 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 1778 struct scsi_sense_hdr sshdr; 1779 struct scsi_device *sdp = sdkp->device; 1780 int res; 1781 1782 if (start) 1783 cmd[4] |= 1; /* START */ 1784 1785 if (!scsi_device_online(sdp)) 1786 return -ENODEV; 1787 1788 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1789 SD_TIMEOUT, SD_MAX_RETRIES); 1790 if (res) { 1791 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 1792 sd_print_result(sdkp, res); 1793 if (driver_byte(res) & DRIVER_SENSE) 1794 sd_print_sense_hdr(sdkp, &sshdr); 1795 } 1796 1797 return res; 1798} 1799 1800/* 1801 * Send a SYNCHRONIZE CACHE instruction down to the device through 1802 * the normal SCSI command structure. Wait for the command to 1803 * complete. 1804 */ 1805static void sd_shutdown(struct device *dev) 1806{ 1807 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1808 1809 if (!sdkp) 1810 return; /* this can happen */ 1811 1812 if (sdkp->WCE) { 1813 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1814 sd_sync_cache(sdkp); 1815 } 1816 1817 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 1818 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1819 sd_start_stop_device(sdkp, 0); 1820 } 1821 1822 scsi_disk_put(sdkp); 1823} 1824 1825static int sd_suspend(struct device *dev, pm_message_t mesg) 1826{ 1827 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1828 int ret = 0; 1829 1830 if (!sdkp) 1831 return 0; /* this can happen */ 1832 1833 if (sdkp->WCE) { 1834 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1835 ret = sd_sync_cache(sdkp); 1836 if (ret) 1837 goto done; 1838 } 1839 1840 if (mesg.event == PM_EVENT_SUSPEND && 1841 sdkp->device->manage_start_stop) { 1842 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1843 ret = sd_start_stop_device(sdkp, 0); 1844 } 1845 1846done: 1847 scsi_disk_put(sdkp); 1848 return ret; 1849} 1850 1851static int sd_resume(struct device *dev) 1852{ 1853 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1854 int ret = 0; 1855 1856 if (!sdkp->device->manage_start_stop) 1857 goto done; 1858 1859 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 1860 ret = sd_start_stop_device(sdkp, 1); 1861 1862done: 1863 scsi_disk_put(sdkp); 1864 return ret; 1865} 1866 1867/** 1868 * init_sd - entry point for this driver (both when built in or when 1869 * a module). 1870 * 1871 * Note: this function registers this driver with the scsi mid-level. 1872 **/ 1873static int __init init_sd(void) 1874{ 1875 int majors = 0, i, err; 1876 1877 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 1878 1879 for (i = 0; i < SD_MAJORS; i++) 1880 if (register_blkdev(sd_major(i), "sd") == 0) 1881 majors++; 1882 1883 if (!majors) 1884 return -ENODEV; 1885 1886 err = class_register(&sd_disk_class); 1887 if (err) 1888 goto err_out; 1889 1890 err = scsi_register_driver(&sd_template.gendrv); 1891 if (err) 1892 goto err_out_class; 1893 1894 return 0; 1895 1896err_out_class: 1897 class_unregister(&sd_disk_class); 1898err_out: 1899 for (i = 0; i < SD_MAJORS; i++) 1900 unregister_blkdev(sd_major(i), "sd"); 1901 return err; 1902} 1903 1904/** 1905 * exit_sd - exit point for this driver (when it is a module). 1906 * 1907 * Note: this function unregisters this driver from the scsi mid-level. 1908 **/ 1909static void __exit exit_sd(void) 1910{ 1911 int i; 1912 1913 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 1914 1915 scsi_unregister_driver(&sd_template.gendrv); 1916 class_unregister(&sd_disk_class); 1917 1918 for (i = 0; i < SD_MAJORS; i++) 1919 unregister_blkdev(sd_major(i), "sd"); 1920} 1921 1922module_init(init_sd); 1923module_exit(exit_sd); 1924 1925static void sd_print_sense_hdr(struct scsi_disk *sdkp, 1926 struct scsi_sense_hdr *sshdr) 1927{ 1928 sd_printk(KERN_INFO, sdkp, ""); 1929 scsi_show_sense_hdr(sshdr); 1930 sd_printk(KERN_INFO, sdkp, ""); 1931 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 1932} 1933 1934static void sd_print_result(struct scsi_disk *sdkp, int result) 1935{ 1936 sd_printk(KERN_INFO, sdkp, ""); 1937 scsi_show_result(result); 1938} 1939 1940