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