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