drivers/scsi/scsi_sysfs.c

   1 /*
   2  * scsi_sysfs.c
   3  *
   4  * SCSI sysfs interface routines.
   5  *
   6  * Created to pull SCSI mid layer sysfs routines into one file.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/device.h>
  14
  15 #include <scsi/scsi.h>
  16 #include <scsi/scsi_device.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_tcq.h>
  19 #include <scsi/scsi_transport.h>
  20
  21 #include "scsi_priv.h"
  22 #include "scsi_logging.h"
  23
  24 static const struct {
  25         enum scsi_device_state  value;
  26         char                    *name;
  27 } sdev_states[] = {
  28         { SDEV_CREATED, "created" },
  29         { SDEV_RUNNING, "running" },
  30         { SDEV_CANCEL, "cancel" },
  31         { SDEV_DEL, "deleted" },
  32         { SDEV_QUIESCE, "quiesce" },
  33         { SDEV_OFFLINE, "offline" },
  34         { SDEV_BLOCK,   "blocked" },
  35 };
  36
  37 const char *scsi_device_state_name(enum scsi_device_state state)
  38 {
  39         int i;
  40         char *name = NULL;
  41
  42         for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
  43                 if (sdev_states[i].value == state) {
  44                         name = sdev_states[i].name;
  45                         break;
  46                 }
  47         }
  48         return name;
  49 }
  50
  51 static const struct {
  52         enum scsi_host_state    value;
  53         char                    *name;
  54 } shost_states[] = {
  55         { SHOST_CREATED, "created" },
  56         { SHOST_RUNNING, "running" },
  57         { SHOST_CANCEL, "cancel" },
  58         { SHOST_DEL, "deleted" },
  59         { SHOST_RECOVERY, "recovery" },
  60         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  61         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  62 };
  63 const char *scsi_host_state_name(enum scsi_host_state state)
  64 {
  65         int i;
  66         char *name = NULL;
  67
  68         for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
  69                 if (shost_states[i].value == state) {
  70                         name = shost_states[i].name;
  71                         break;
  72                 }
  73         }
  74         return name;
  75 }
  76
  77 static int check_set(unsigned int *val, char *src)
  78 {
  79         char *last;
  80
  81         if (strncmp(src, "-", 20) == 0) {
  82                 *val = SCAN_WILD_CARD;
  83         } else {
  84                 /*
  85                  * Doesn't check for int overflow
  86                  */
  87                 *val = simple_strtoul(src, &last, 0);
  88                 if (*last != '\0')
  89                         return 1;
  90         }
  91         return 0;
  92 }
  93
  94 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  95 {
  96         char s1[15], s2[15], s3[15], junk;
  97         unsigned int channel, id, lun;
  98         int res;
  99
 100         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 101         if (res != 3)
 102                 return -EINVAL;
 103         if (check_set(&channel, s1))
 104                 return -EINVAL;
 105         if (check_set(&id, s2))
 106                 return -EINVAL;
 107         if (check_set(&lun, s3))
 108                 return -EINVAL;
 109         if (shost->transportt->user_scan)
 110                 res = shost->transportt->user_scan(shost, channel, id, lun);
 111         else
 112                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 113         return res;
 114 }
 115
 116 /*
 117  * shost_show_function: macro to create an attr function that can be used to
 118  * show a non-bit field.
 119  */
 120 #define shost_show_function(name, field, format_string)                 \
 121 static ssize_t                                                          \
 122 show_##name (struct class_device *class_dev, char *buf)                 \
 123 {                                                                       \
 124         struct Scsi_Host *shost = class_to_shost(class_dev);            \
 125         return snprintf (buf, 20, format_string, shost->field);         \
 126 }
 127
 128 /*
 129  * shost_rd_attr: macro to create a function and attribute variable for a
 130  * read only field.
 131  */
 132 #define shost_rd_attr2(name, field, format_string)                      \
 133         shost_show_function(name, field, format_string)                 \
 134 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 135
 136 #define shost_rd_attr(field, format_string) \
 137 shost_rd_attr2(field, field, format_string)
 138
 139 /*
 140  * Create the actual show/store functions and data structures.
 141  */
 142
 143 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 144                           size_t count)
 145 {
 146         struct Scsi_Host *shost = class_to_shost(class_dev);
 147         int res;
 148
 149         res = scsi_scan(shost, buf);
 150         if (res == 0)
 151                 res = count;
 152         return res;
 153 };
 154 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 155
 156 static ssize_t
 157 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
 158 {
 159         int i;
 160         struct Scsi_Host *shost = class_to_shost(class_dev);
 161         enum scsi_host_state state = 0;
 162
 163         for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
 164                 const int len = strlen(shost_states[i].name);
 165                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 166                    buf[len] == '\n') {
 167                         state = shost_states[i].value;
 168                         break;
 169                 }
 170         }
 171         if (!state)
 172                 return -EINVAL;
 173
 174         if (scsi_host_set_state(shost, state))
 175                 return -EINVAL;
 176         return count;
 177 }
 178
 179 static ssize_t
 180 show_shost_state(struct class_device *class_dev, char *buf)
 181 {
 182         struct Scsi_Host *shost = class_to_shost(class_dev);
 183         const char *name = scsi_host_state_name(shost->shost_state);
 184
 185         if (!name)
 186                 return -EINVAL;
 187
 188         return snprintf(buf, 20, "%s\n", name);
 189 }
 190
 191 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 192
 193 shost_rd_attr(unique_id, "%u\n");
 194 shost_rd_attr(host_busy, "%hu\n");
 195 shost_rd_attr(cmd_per_lun, "%hd\n");
 196 shost_rd_attr(sg_tablesize, "%hu\n");
 197 shost_rd_attr(unchecked_isa_dma, "%d\n");
 198 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 199
 200 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 201         &class_device_attr_unique_id,
 202         &class_device_attr_host_busy,
 203         &class_device_attr_cmd_per_lun,
 204         &class_device_attr_sg_tablesize,
 205         &class_device_attr_unchecked_isa_dma,
 206         &class_device_attr_proc_name,
 207         &class_device_attr_scan,
 208         &class_device_attr_state,
 209         NULL
 210 };
 211
 212 static void scsi_device_cls_release(struct class_device *class_dev)
 213 {
 214         struct scsi_device *sdev;
 215
 216         sdev = class_to_sdev(class_dev);
 217         put_device(&sdev->sdev_gendev);
 218 }
 219
 220 static void scsi_device_dev_release(struct device *dev)
 221 {
 222         struct scsi_device *sdev;
 223         struct device *parent;
 224         struct scsi_target *starget;
 225         unsigned long flags;
 226
 227         parent = dev->parent;
 228         sdev = to_scsi_device(dev);
 229         starget = to_scsi_target(parent);
 230
 231         spin_lock_irqsave(sdev->host->host_lock, flags);
 232         starget->reap_ref++;
 233         list_del(&sdev->siblings);
 234         list_del(&sdev->same_target_siblings);
 235         list_del(&sdev->starved_entry);
 236         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 237
 238         if (sdev->request_queue) {
 239                 sdev->request_queue->queuedata = NULL;
 240                 scsi_free_queue(sdev->request_queue);
 241                 /* temporary expedient, try to catch use of queue lock
 242                  * after free of sdev */
 243                 sdev->request_queue = NULL;
 244         }
 245
 246         scsi_target_reap(scsi_target(sdev));
 247
 248         kfree(sdev->inquiry);
 249         kfree(sdev);
 250
 251         if (parent)
 252                 put_device(parent);
 253 }
 254
 255 static struct class sdev_class = {
 256         .name           = "scsi_device",
 257         .release        = scsi_device_cls_release,
 258 };
 259
 260 /* all probing is done in the individual ->probe routines */
 261 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 262 {
 263         struct scsi_device *sdp = to_scsi_device(dev);
 264         if (sdp->no_uld_attach)
 265                 return 0;
 266         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 267 }
 268
 269 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 270 {
 271         struct scsi_device *sdev = to_scsi_device(dev);
 272         struct scsi_host_template *sht = sdev->host->hostt;
 273         int err;
 274
 275         err = scsi_device_quiesce(sdev);
 276         if (err)
 277                 return err;
 278
 279         if (sht->suspend)
 280                 err = sht->suspend(sdev);
 281
 282         return err;
 283 }
 284
 285 static int scsi_bus_resume(struct device * dev)
 286 {
 287         struct scsi_device *sdev = to_scsi_device(dev);
 288         struct scsi_host_template *sht = sdev->host->hostt;
 289         int err = 0;
 290
 291         if (sht->resume)
 292                 err = sht->resume(sdev);
 293
 294         scsi_device_resume(sdev);
 295         return err;
 296 }
 297
 298 struct bus_type scsi_bus_type = {
 299         .name           = "scsi",
 300         .match          = scsi_bus_match,
 301         .suspend        = scsi_bus_suspend,
 302         .resume         = scsi_bus_resume,
 303 };
 304
 305 int scsi_sysfs_register(void)
 306 {
 307         int error;
 308
 309         error = bus_register(&scsi_bus_type);
 310         if (!error) {
 311                 error = class_register(&sdev_class);
 312                 if (error)
 313                         bus_unregister(&scsi_bus_type);
 314         }
 315
 316         return error;
 317 }
 318
 319 void scsi_sysfs_unregister(void)
 320 {
 321         class_unregister(&sdev_class);
 322         bus_unregister(&scsi_bus_type);
 323 }
 324
 325 /*
 326  * sdev_show_function: macro to create an attr function that can be used to
 327  * show a non-bit field.
 328  */
 329 #define sdev_show_function(field, format_string)                                \
 330 static ssize_t                                                          \
 331 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 332 {                                                                       \
 333         struct scsi_device *sdev;                                       \
 334         sdev = to_scsi_device(dev);                                     \
 335         return snprintf (buf, 20, format_string, sdev->field);          \
 336 }                                                                       \
 337
 338 /*
 339  * sdev_rd_attr: macro to create a function and attribute variable for a
 340  * read only field.
 341  */
 342 #define sdev_rd_attr(field, format_string)                              \
 343         sdev_show_function(field, format_string)                        \
 344 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 345
 346
 347 /*
 348  * sdev_rd_attr: create a function and attribute variable for a
 349  * read/write field.
 350  */
 351 #define sdev_rw_attr(field, format_string)                              \
 352         sdev_show_function(field, format_string)                                \
 353                                                                         \
 354 static ssize_t                                                          \
 355 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 356 {                                                                       \
 357         struct scsi_device *sdev;                                       \
 358         sdev = to_scsi_device(dev);                                     \
 359         snscanf (buf, 20, format_string, &sdev->field);                 \
 360         return count;                                                   \
 361 }                                                                       \
 362 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 363
 364 /* Currently we don't export bit fields, but we might in future,
 365  * so leave this code in */
 366 #if 0
 367 /*
 368  * sdev_rd_attr: create a function and attribute variable for a
 369  * read/write bit field.
 370  */
 371 #define sdev_rw_attr_bit(field)                                         \
 372         sdev_show_function(field, "%d\n")                                       \
 373                                                                         \
 374 static ssize_t                                                          \
 375 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 376 {                                                                       \
 377         int ret;                                                        \
 378         struct scsi_device *sdev;                                       \
 379         ret = scsi_sdev_check_buf_bit(buf);                             \
 380         if (ret >= 0)   {                                               \
 381                 sdev = to_scsi_device(dev);                             \
 382                 sdev->field = ret;                                      \
 383                 ret = count;                                            \
 384         }                                                               \
 385         return ret;                                                     \
 386 }                                                                       \
 387 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 388
 389 /*
 390  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 391  * else return -EINVAL.
 392  */
 393 static int scsi_sdev_check_buf_bit(const char *buf)
 394 {
 395         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 396                 if (buf[0] == '1')
 397                         return 1;
 398                 else if (buf[0] == '0')
 399                         return 0;
 400                 else
 401                         return -EINVAL;
 402         } else
 403                 return -EINVAL;
 404 }
 405 #endif
 406 /*
 407  * Create the actual show/store functions and data structures.
 408  */
 409 sdev_rd_attr (device_blocked, "%d\n");
 410 sdev_rd_attr (queue_depth, "%d\n");
 411 sdev_rd_attr (type, "%d\n");
 412 sdev_rd_attr (scsi_level, "%d\n");
 413 sdev_rd_attr (vendor, "%.8s\n");
 414 sdev_rd_attr (model, "%.16s\n");
 415 sdev_rd_attr (rev, "%.4s\n");
 416
 417 static ssize_t
 418 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 419 {
 420         struct scsi_device *sdev;
 421         sdev = to_scsi_device(dev);
 422         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 423 }
 424
 425 static ssize_t
 426 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 427 {
 428         struct scsi_device *sdev;
 429         int timeout;
 430         sdev = to_scsi_device(dev);
 431         sscanf (buf, "%d\n", &timeout);
 432         sdev->timeout = timeout * HZ;
 433         return count;
 434 }
 435 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 436
 437 static ssize_t
 438 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 439 {
 440         scsi_rescan_device(dev);
 441         return count;
 442 }
 443 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 444
 445 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 446                                  size_t count)
 447 {
 448         scsi_remove_device(to_scsi_device(dev));
 449         return count;
 450 };
 451 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 452
 453 static ssize_t
 454 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 455 {
 456         int i;
 457         struct scsi_device *sdev = to_scsi_device(dev);
 458         enum scsi_device_state state = 0;
 459
 460         for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
 461                 const int len = strlen(sdev_states[i].name);
 462                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 463                    buf[len] == '\n') {
 464                         state = sdev_states[i].value;
 465                         break;
 466                 }
 467         }
 468         if (!state)
 469                 return -EINVAL;
 470
 471         if (scsi_device_set_state(sdev, state))
 472                 return -EINVAL;
 473         return count;
 474 }
 475
 476 static ssize_t
 477 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 478 {
 479         struct scsi_device *sdev = to_scsi_device(dev);
 480         const char *name = scsi_device_state_name(sdev->sdev_state);
 481
 482         if (!name)
 483                 return -EINVAL;
 484
 485         return snprintf(buf, 20, "%s\n", name);
 486 }
 487
 488 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 489
 490 static ssize_t
 491 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 492 {
 493         struct scsi_device *sdev = to_scsi_device(dev);
 494         const char *name = "none";
 495
 496         if (sdev->ordered_tags)
 497                 name = "ordered";
 498         else if (sdev->simple_tags)
 499                 name = "simple";
 500
 501         return snprintf(buf, 20, "%s\n", name);
 502 }
 503
 504 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 505
 506 static ssize_t
 507 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 508 {
 509         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 510 }
 511
 512 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 513
 514 #define show_sdev_iostat(field)                                         \
 515 static ssize_t                                                          \
 516 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 517 {                                                                       \
 518         struct scsi_device *sdev = to_scsi_device(dev);                 \
 519         unsigned long long count = atomic_read(&sdev->field);           \
 520         return snprintf(buf, 20, "0x%llx\n", count);                    \
 521 }                                                                       \
 522 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 523
 524 show_sdev_iostat(iorequest_cnt);
 525 show_sdev_iostat(iodone_cnt);
 526 show_sdev_iostat(ioerr_cnt);
 527
 528
 529 /* Default template for device attributes.  May NOT be modified */
 530 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 531         &dev_attr_device_blocked,
 532         &dev_attr_queue_depth,
 533         &dev_attr_queue_type,
 534         &dev_attr_type,
 535         &dev_attr_scsi_level,
 536         &dev_attr_vendor,
 537         &dev_attr_model,
 538         &dev_attr_rev,
 539         &dev_attr_rescan,
 540         &dev_attr_delete,
 541         &dev_attr_state,
 542         &dev_attr_timeout,
 543         &dev_attr_iocounterbits,
 544         &dev_attr_iorequest_cnt,
 545         &dev_attr_iodone_cnt,
 546         &dev_attr_ioerr_cnt,
 547         NULL
 548 };
 549
 550 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 551                                          size_t count)
 552 {
 553         int depth, retval;
 554         struct scsi_device *sdev = to_scsi_device(dev);
 555         struct scsi_host_template *sht = sdev->host->hostt;
 556
 557         if (!sht->change_queue_depth)
 558                 return -EINVAL;
 559
 560         depth = simple_strtoul(buf, NULL, 0);
 561
 562         if (depth < 1)
 563                 return -EINVAL;
 564
 565         retval = sht->change_queue_depth(sdev, depth);
 566         if (retval < 0)
 567                 return retval;
 568
 569         return count;
 570 }
 571
 572 static struct device_attribute sdev_attr_queue_depth_rw =
 573         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 574                sdev_store_queue_depth_rw);
 575
 576 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 577                                         size_t count)
 578 {
 579         struct scsi_device *sdev = to_scsi_device(dev);
 580         struct scsi_host_template *sht = sdev->host->hostt;
 581         int tag_type = 0, retval;
 582         int prev_tag_type = scsi_get_tag_type(sdev);
 583
 584         if (!sdev->tagged_supported || !sht->change_queue_type)
 585                 return -EINVAL;
 586
 587         if (strncmp(buf, "ordered", 7) == 0)
 588                 tag_type = MSG_ORDERED_TAG;
 589         else if (strncmp(buf, "simple", 6) == 0)
 590                 tag_type = MSG_SIMPLE_TAG;
 591         else if (strncmp(buf, "none", 4) != 0)
 592                 return -EINVAL;
 593
 594         if (tag_type == prev_tag_type)
 595                 return count;
 596
 597         retval = sht->change_queue_type(sdev, tag_type);
 598         if (retval < 0)
 599                 return retval;
 600
 601         return count;
 602 }
 603
 604 static struct device_attribute sdev_attr_queue_type_rw =
 605         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 606                sdev_store_queue_type_rw);
 607
 608 static struct device_attribute *attr_changed_internally(
 609                 struct Scsi_Host *shost,
 610                 struct device_attribute * attr)
 611 {
 612         if (!strcmp("queue_depth", attr->attr.name)
 613             && shost->hostt->change_queue_depth)
 614                 return &sdev_attr_queue_depth_rw;
 615         else if (!strcmp("queue_type", attr->attr.name)
 616             && shost->hostt->change_queue_type)
 617                 return &sdev_attr_queue_type_rw;
 618         return attr;
 619 }
 620
 621
 622 static struct device_attribute *attr_overridden(
 623                 struct device_attribute **attrs,
 624                 struct device_attribute *attr)
 625 {
 626         int i;
 627
 628         if (!attrs)
 629                 return NULL;
 630         for (i = 0; attrs[i]; i++)
 631                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 632                         return attrs[i];
 633         return NULL;
 634 }
 635
 636 static int attr_add(struct device *dev, struct device_attribute *attr)
 637 {
 638         struct device_attribute *base_attr;
 639
 640         /*
 641          * Spare the caller from having to copy things it's not interested in.
 642          */
 643         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 644         if (base_attr) {
 645                 /* extend permissions */
 646                 attr->attr.mode |= base_attr->attr.mode;
 647
 648                 /* override null show/store with default */
 649                 if (!attr->show)
 650                         attr->show = base_attr->show;
 651                 if (!attr->store)
 652                         attr->store = base_attr->store;
 653         }
 654
 655         return device_create_file(dev, attr);
 656 }
 657
 658 /**
 659  * scsi_sysfs_add_sdev - add scsi device to sysfs
 660  * @sdev:       scsi_device to add
 661  *
 662  * Return value:
 663  *      0 on Success / non-zero on Failure
 664  **/
 665 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 666 {
 667         int error, i;
 668
 669         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 670                 return error;
 671
 672         error = device_add(&sdev->sdev_gendev);
 673         if (error) {
 674                 put_device(sdev->sdev_gendev.parent);
 675                 printk(KERN_INFO "error 1\n");
 676                 return error;
 677         }
 678         error = class_device_add(&sdev->sdev_classdev);
 679         if (error) {
 680                 printk(KERN_INFO "error 2\n");
 681                 goto clean_device;
 682         }
 683
 684         /* take a reference for the sdev_classdev; this is
 685          * released by the sdev_class .release */
 686         get_device(&sdev->sdev_gendev);
 687         if (sdev->host->hostt->sdev_attrs) {
 688                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 689                         error = attr_add(&sdev->sdev_gendev,
 690                                         sdev->host->hostt->sdev_attrs[i]);
 691                         if (error) {
 692                                 __scsi_remove_device(sdev);
 693                                 goto out;
 694                         }
 695                 }
 696         }
 697
 698         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 699                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 700                                         scsi_sysfs_sdev_attrs[i])) {
 701                         struct device_attribute * attr =
 702                                 attr_changed_internally(sdev->host,
 703                                                         scsi_sysfs_sdev_attrs[i]);
 704                         error = device_create_file(&sdev->sdev_gendev, attr);
 705                         if (error) {
 706                                 __scsi_remove_device(sdev);
 707                                 goto out;
 708                         }
 709                 }
 710         }
 711
 712         transport_add_device(&sdev->sdev_gendev);
 713  out:
 714         return error;
 715
 716  clean_device:
 717         scsi_device_set_state(sdev, SDEV_CANCEL);
 718
 719         device_del(&sdev->sdev_gendev);
 720         transport_destroy_device(&sdev->sdev_gendev);
 721         put_device(&sdev->sdev_gendev);
 722
 723         return error;
 724 }
 725
 726 void __scsi_remove_device(struct scsi_device *sdev)
 727 {
 728         struct device *dev = &sdev->sdev_gendev;
 729
 730         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 731                 return;
 732
 733         class_device_unregister(&sdev->sdev_classdev);
 734         transport_remove_device(dev);
 735         device_del(dev);
 736         scsi_device_set_state(sdev, SDEV_DEL);
 737         if (sdev->host->hostt->slave_destroy)
 738                 sdev->host->hostt->slave_destroy(sdev);
 739         transport_destroy_device(dev);
 740         put_device(dev);
 741 }
 742
 743 /**
 744  * scsi_remove_device - unregister a device from the scsi bus
 745  * @sdev:       scsi_device to unregister
 746  **/
 747 void scsi_remove_device(struct scsi_device *sdev)
 748 {
 749         struct Scsi_Host *shost = sdev->host;
 750
 751         mutex_lock(&shost->scan_mutex);
 752         __scsi_remove_device(sdev);
 753         mutex_unlock(&shost->scan_mutex);
 754 }
 755 EXPORT_SYMBOL(scsi_remove_device);
 756
 757 void __scsi_remove_target(struct scsi_target *starget)
 758 {
 759         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 760         unsigned long flags;
 761         struct scsi_device *sdev;
 762
 763         spin_lock_irqsave(shost->host_lock, flags);
 764         starget->reap_ref++;
 765  restart:
 766         list_for_each_entry(sdev, &shost->__devices, siblings) {
 767                 if (sdev->channel != starget->channel ||
 768                     sdev->id != starget->id ||
 769                     sdev->sdev_state == SDEV_DEL)
 770                         continue;
 771                 spin_unlock_irqrestore(shost->host_lock, flags);
 772                 scsi_remove_device(sdev);
 773                 spin_lock_irqsave(shost->host_lock, flags);
 774                 goto restart;
 775         }
 776         spin_unlock_irqrestore(shost->host_lock, flags);
 777         scsi_target_reap(starget);
 778 }
 779
 780 static int __remove_child (struct device * dev, void * data)
 781 {
 782         if (scsi_is_target_device(dev))
 783                 __scsi_remove_target(to_scsi_target(dev));
 784         return 0;
 785 }
 786
 787 /**
 788  * scsi_remove_target - try to remove a target and all its devices
 789  * @dev: generic starget or parent of generic stargets to be removed
 790  *
 791  * Note: This is slightly racy.  It is possible that if the user
 792  * requests the addition of another device then the target won't be
 793  * removed.
 794  */
 795 void scsi_remove_target(struct device *dev)
 796 {
 797         struct device *rdev;
 798
 799         if (scsi_is_target_device(dev)) {
 800                 __scsi_remove_target(to_scsi_target(dev));
 801                 return;
 802         }
 803
 804         rdev = get_device(dev);
 805         device_for_each_child(dev, NULL, __remove_child);
 806         put_device(rdev);
 807 }
 808 EXPORT_SYMBOL(scsi_remove_target);
 809
 810 int scsi_register_driver(struct device_driver *drv)
 811 {
 812         drv->bus = &scsi_bus_type;
 813
 814         return driver_register(drv);
 815 }
 816 EXPORT_SYMBOL(scsi_register_driver);
 817
 818 int scsi_register_interface(struct class_interface *intf)
 819 {
 820         intf->class = &sdev_class;
 821
 822         return class_interface_register(intf);
 823 }
 824 EXPORT_SYMBOL(scsi_register_interface);
 825
 826
 827 static struct class_device_attribute *class_attr_overridden(
 828                 struct class_device_attribute **attrs,
 829                 struct class_device_attribute *attr)
 830 {
 831         int i;
 832
 833         if (!attrs)
 834                 return NULL;
 835         for (i = 0; attrs[i]; i++)
 836                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 837                         return attrs[i];
 838         return NULL;
 839 }
 840
 841 static int class_attr_add(struct class_device *classdev,
 842                 struct class_device_attribute *attr)
 843 {
 844         struct class_device_attribute *base_attr;
 845
 846         /*
 847          * Spare the caller from having to copy things it's not interested in.
 848          */
 849         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 850         if (base_attr) {
 851                 /* extend permissions */
 852                 attr->attr.mode |= base_attr->attr.mode;
 853
 854                 /* override null show/store with default */
 855                 if (!attr->show)
 856                         attr->show = base_attr->show;
 857                 if (!attr->store)
 858                         attr->store = base_attr->store;
 859         }
 860
 861         return class_device_create_file(classdev, attr);
 862 }
 863
 864 /**
 865  * scsi_sysfs_add_host - add scsi host to subsystem
 866  * @shost:     scsi host struct to add to subsystem
 867  * @dev:       parent struct device pointer
 868  **/
 869 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 870 {
 871         int error, i;
 872
 873         if (shost->hostt->shost_attrs) {
 874                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 875                         error = class_attr_add(&shost->shost_classdev,
 876                                         shost->hostt->shost_attrs[i]);
 877                         if (error)
 878                                 return error;
 879                 }
 880         }
 881
 882         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 883                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 884                                         scsi_sysfs_shost_attrs[i])) {
 885                         error = class_device_create_file(&shost->shost_classdev,
 886                                         scsi_sysfs_shost_attrs[i]);
 887                         if (error)
 888                                 return error;
 889                 }
 890         }
 891
 892         transport_register_device(&shost->shost_gendev);
 893         return 0;
 894 }
 895
 896 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 897 {
 898         unsigned long flags;
 899         struct Scsi_Host *shost = sdev->host;
 900         struct scsi_target  *starget = sdev->sdev_target;
 901
 902         device_initialize(&sdev->sdev_gendev);
 903         sdev->sdev_gendev.bus = &scsi_bus_type;
 904         sdev->sdev_gendev.release = scsi_device_dev_release;
 905         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 906                 sdev->host->host_no, sdev->channel, sdev->id,
 907                 sdev->lun);
 908
 909         class_device_initialize(&sdev->sdev_classdev);
 910         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 911         sdev->sdev_classdev.class = &sdev_class;
 912         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 913                  "%d:%d:%d:%d", sdev->host->host_no,
 914                  sdev->channel, sdev->id, sdev->lun);
 915         sdev->scsi_level = SCSI_2;
 916         transport_setup_device(&sdev->sdev_gendev);
 917         spin_lock_irqsave(shost->host_lock, flags);
 918         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 919         list_add_tail(&sdev->siblings, &shost->__devices);
 920         spin_unlock_irqrestore(shost->host_lock, flags);
 921 }
 922
 923 int scsi_is_sdev_device(const struct device *dev)
 924 {
 925         return dev->release == scsi_device_dev_release;
 926 }
 927 EXPORT_SYMBOL(scsi_is_sdev_device);
 928
 929 /* A blank transport template that is used in drivers that don't
 930  * yet implement Transport Attributes */
 931 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };