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_usercontext(void *data)
 221 {
 222         struct device *dev = data;
 223         struct scsi_device *sdev;
 224         struct device *parent;
 225         struct scsi_target *starget;
 226         unsigned long flags;
 227
 228         parent = dev->parent;
 229         sdev = to_scsi_device(dev);
 230         starget = to_scsi_target(parent);
 231
 232         spin_lock_irqsave(sdev->host->host_lock, flags);
 233         starget->reap_ref++;
 234         list_del(&sdev->siblings);
 235         list_del(&sdev->same_target_siblings);
 236         list_del(&sdev->starved_entry);
 237         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 238
 239         if (sdev->request_queue) {
 240                 sdev->request_queue->queuedata = NULL;
 241                 /* user context needed to free queue */
 242                 scsi_free_queue(sdev->request_queue);
 243                 /* temporary expedient, try to catch use of queue lock
 244                  * after free of sdev */
 245                 sdev->request_queue = NULL;
 246         }
 247
 248         scsi_target_reap(scsi_target(sdev));
 249
 250         kfree(sdev->inquiry);
 251         kfree(sdev);
 252
 253         if (parent)
 254                 put_device(parent);
 255 }
 256
 257 static void scsi_device_dev_release(struct device *dev)
 258 {
 259         scsi_execute_in_process_context(scsi_device_dev_release_usercontext,    dev);
 260 }
 261
 262 static struct class sdev_class = {
 263         .name           = "scsi_device",
 264         .release        = scsi_device_cls_release,
 265 };
 266
 267 /* all probing is done in the individual ->probe routines */
 268 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 269 {
 270         struct scsi_device *sdp = to_scsi_device(dev);
 271         if (sdp->no_uld_attach)
 272                 return 0;
 273         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 274 }
 275
 276 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 277 {
 278         struct scsi_device *sdev = to_scsi_device(dev);
 279         struct scsi_host_template *sht = sdev->host->hostt;
 280         int err;
 281
 282         err = scsi_device_quiesce(sdev);
 283         if (err)
 284                 return err;
 285
 286         if (sht->suspend)
 287                 err = sht->suspend(sdev);
 288
 289         return err;
 290 }
 291
 292 static int scsi_bus_resume(struct device * dev)
 293 {
 294         struct scsi_device *sdev = to_scsi_device(dev);
 295         struct scsi_host_template *sht = sdev->host->hostt;
 296         int err = 0;
 297
 298         if (sht->resume)
 299                 err = sht->resume(sdev);
 300
 301         scsi_device_resume(sdev);
 302         return err;
 303 }
 304
 305 struct bus_type scsi_bus_type = {
 306         .name           = "scsi",
 307         .match          = scsi_bus_match,
 308         .suspend        = scsi_bus_suspend,
 309         .resume         = scsi_bus_resume,
 310 };
 311
 312 int scsi_sysfs_register(void)
 313 {
 314         int error;
 315
 316         error = bus_register(&scsi_bus_type);
 317         if (!error) {
 318                 error = class_register(&sdev_class);
 319                 if (error)
 320                         bus_unregister(&scsi_bus_type);
 321         }
 322
 323         return error;
 324 }
 325
 326 void scsi_sysfs_unregister(void)
 327 {
 328         class_unregister(&sdev_class);
 329         bus_unregister(&scsi_bus_type);
 330 }
 331
 332 /*
 333  * sdev_show_function: macro to create an attr function that can be used to
 334  * show a non-bit field.
 335  */
 336 #define sdev_show_function(field, format_string)                                \
 337 static ssize_t                                                          \
 338 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 339 {                                                                       \
 340         struct scsi_device *sdev;                                       \
 341         sdev = to_scsi_device(dev);                                     \
 342         return snprintf (buf, 20, format_string, sdev->field);          \
 343 }                                                                       \
 344
 345 /*
 346  * sdev_rd_attr: macro to create a function and attribute variable for a
 347  * read only field.
 348  */
 349 #define sdev_rd_attr(field, format_string)                              \
 350         sdev_show_function(field, format_string)                        \
 351 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 352
 353
 354 /*
 355  * sdev_rd_attr: create a function and attribute variable for a
 356  * read/write field.
 357  */
 358 #define sdev_rw_attr(field, format_string)                              \
 359         sdev_show_function(field, format_string)                                \
 360                                                                         \
 361 static ssize_t                                                          \
 362 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 363 {                                                                       \
 364         struct scsi_device *sdev;                                       \
 365         sdev = to_scsi_device(dev);                                     \
 366         snscanf (buf, 20, format_string, &sdev->field);                 \
 367         return count;                                                   \
 368 }                                                                       \
 369 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 370
 371 /* Currently we don't export bit fields, but we might in future,
 372  * so leave this code in */
 373 #if 0
 374 /*
 375  * sdev_rd_attr: create a function and attribute variable for a
 376  * read/write bit field.
 377  */
 378 #define sdev_rw_attr_bit(field)                                         \
 379         sdev_show_function(field, "%d\n")                                       \
 380                                                                         \
 381 static ssize_t                                                          \
 382 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 383 {                                                                       \
 384         int ret;                                                        \
 385         struct scsi_device *sdev;                                       \
 386         ret = scsi_sdev_check_buf_bit(buf);                             \
 387         if (ret >= 0)   {                                               \
 388                 sdev = to_scsi_device(dev);                             \
 389                 sdev->field = ret;                                      \
 390                 ret = count;                                            \
 391         }                                                               \
 392         return ret;                                                     \
 393 }                                                                       \
 394 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 395
 396 /*
 397  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 398  * else return -EINVAL.
 399  */
 400 static int scsi_sdev_check_buf_bit(const char *buf)
 401 {
 402         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 403                 if (buf[0] == '1')
 404                         return 1;
 405                 else if (buf[0] == '0')
 406                         return 0;
 407                 else
 408                         return -EINVAL;
 409         } else
 410                 return -EINVAL;
 411 }
 412 #endif
 413 /*
 414  * Create the actual show/store functions and data structures.
 415  */
 416 sdev_rd_attr (device_blocked, "%d\n");
 417 sdev_rd_attr (queue_depth, "%d\n");
 418 sdev_rd_attr (type, "%d\n");
 419 sdev_rd_attr (scsi_level, "%d\n");
 420 sdev_rd_attr (vendor, "%.8s\n");
 421 sdev_rd_attr (model, "%.16s\n");
 422 sdev_rd_attr (rev, "%.4s\n");
 423
 424 static ssize_t
 425 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 426 {
 427         struct scsi_device *sdev;
 428         sdev = to_scsi_device(dev);
 429         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 430 }
 431
 432 static ssize_t
 433 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 434 {
 435         struct scsi_device *sdev;
 436         int timeout;
 437         sdev = to_scsi_device(dev);
 438         sscanf (buf, "%d\n", &timeout);
 439         sdev->timeout = timeout * HZ;
 440         return count;
 441 }
 442 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 443
 444 static ssize_t
 445 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 446 {
 447         scsi_rescan_device(dev);
 448         return count;
 449 }
 450 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 451
 452 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 453                                  size_t count)
 454 {
 455         scsi_remove_device(to_scsi_device(dev));
 456         return count;
 457 };
 458 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 459
 460 static ssize_t
 461 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 462 {
 463         int i;
 464         struct scsi_device *sdev = to_scsi_device(dev);
 465         enum scsi_device_state state = 0;
 466
 467         for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
 468                 const int len = strlen(sdev_states[i].name);
 469                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 470                    buf[len] == '\n') {
 471                         state = sdev_states[i].value;
 472                         break;
 473                 }
 474         }
 475         if (!state)
 476                 return -EINVAL;
 477
 478         if (scsi_device_set_state(sdev, state))
 479                 return -EINVAL;
 480         return count;
 481 }
 482
 483 static ssize_t
 484 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 485 {
 486         struct scsi_device *sdev = to_scsi_device(dev);
 487         const char *name = scsi_device_state_name(sdev->sdev_state);
 488
 489         if (!name)
 490                 return -EINVAL;
 491
 492         return snprintf(buf, 20, "%s\n", name);
 493 }
 494
 495 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 496
 497 static ssize_t
 498 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 499 {
 500         struct scsi_device *sdev = to_scsi_device(dev);
 501         const char *name = "none";
 502
 503         if (sdev->ordered_tags)
 504                 name = "ordered";
 505         else if (sdev->simple_tags)
 506                 name = "simple";
 507
 508         return snprintf(buf, 20, "%s\n", name);
 509 }
 510
 511 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 512
 513 static ssize_t
 514 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 515 {
 516         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 517 }
 518
 519 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 520
 521 #define show_sdev_iostat(field)                                         \
 522 static ssize_t                                                          \
 523 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 524 {                                                                       \
 525         struct scsi_device *sdev = to_scsi_device(dev);                 \
 526         unsigned long long count = atomic_read(&sdev->field);           \
 527         return snprintf(buf, 20, "0x%llx\n", count);                    \
 528 }                                                                       \
 529 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 530
 531 show_sdev_iostat(iorequest_cnt);
 532 show_sdev_iostat(iodone_cnt);
 533 show_sdev_iostat(ioerr_cnt);
 534
 535
 536 /* Default template for device attributes.  May NOT be modified */
 537 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 538         &dev_attr_device_blocked,
 539         &dev_attr_queue_depth,
 540         &dev_attr_queue_type,
 541         &dev_attr_type,
 542         &dev_attr_scsi_level,
 543         &dev_attr_vendor,
 544         &dev_attr_model,
 545         &dev_attr_rev,
 546         &dev_attr_rescan,
 547         &dev_attr_delete,
 548         &dev_attr_state,
 549         &dev_attr_timeout,
 550         &dev_attr_iocounterbits,
 551         &dev_attr_iorequest_cnt,
 552         &dev_attr_iodone_cnt,
 553         &dev_attr_ioerr_cnt,
 554         NULL
 555 };
 556
 557 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 558                                          size_t count)
 559 {
 560         int depth, retval;
 561         struct scsi_device *sdev = to_scsi_device(dev);
 562         struct scsi_host_template *sht = sdev->host->hostt;
 563
 564         if (!sht->change_queue_depth)
 565                 return -EINVAL;
 566
 567         depth = simple_strtoul(buf, NULL, 0);
 568
 569         if (depth < 1)
 570                 return -EINVAL;
 571
 572         retval = sht->change_queue_depth(sdev, depth);
 573         if (retval < 0)
 574                 return retval;
 575
 576         return count;
 577 }
 578
 579 static struct device_attribute sdev_attr_queue_depth_rw =
 580         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 581                sdev_store_queue_depth_rw);
 582
 583 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 584                                         size_t count)
 585 {
 586         struct scsi_device *sdev = to_scsi_device(dev);
 587         struct scsi_host_template *sht = sdev->host->hostt;
 588         int tag_type = 0, retval;
 589         int prev_tag_type = scsi_get_tag_type(sdev);
 590
 591         if (!sdev->tagged_supported || !sht->change_queue_type)
 592                 return -EINVAL;
 593
 594         if (strncmp(buf, "ordered", 7) == 0)
 595                 tag_type = MSG_ORDERED_TAG;
 596         else if (strncmp(buf, "simple", 6) == 0)
 597                 tag_type = MSG_SIMPLE_TAG;
 598         else if (strncmp(buf, "none", 4) != 0)
 599                 return -EINVAL;
 600
 601         if (tag_type == prev_tag_type)
 602                 return count;
 603
 604         retval = sht->change_queue_type(sdev, tag_type);
 605         if (retval < 0)
 606                 return retval;
 607
 608         return count;
 609 }
 610
 611 static struct device_attribute sdev_attr_queue_type_rw =
 612         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 613                sdev_store_queue_type_rw);
 614
 615 static struct device_attribute *attr_changed_internally(
 616                 struct Scsi_Host *shost,
 617                 struct device_attribute * attr)
 618 {
 619         if (!strcmp("queue_depth", attr->attr.name)
 620             && shost->hostt->change_queue_depth)
 621                 return &sdev_attr_queue_depth_rw;
 622         else if (!strcmp("queue_type", attr->attr.name)
 623             && shost->hostt->change_queue_type)
 624                 return &sdev_attr_queue_type_rw;
 625         return attr;
 626 }
 627
 628
 629 static struct device_attribute *attr_overridden(
 630                 struct device_attribute **attrs,
 631                 struct device_attribute *attr)
 632 {
 633         int i;
 634
 635         if (!attrs)
 636                 return NULL;
 637         for (i = 0; attrs[i]; i++)
 638                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 639                         return attrs[i];
 640         return NULL;
 641 }
 642
 643 static int attr_add(struct device *dev, struct device_attribute *attr)
 644 {
 645         struct device_attribute *base_attr;
 646
 647         /*
 648          * Spare the caller from having to copy things it's not interested in.
 649          */
 650         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 651         if (base_attr) {
 652                 /* extend permissions */
 653                 attr->attr.mode |= base_attr->attr.mode;
 654
 655                 /* override null show/store with default */
 656                 if (!attr->show)
 657                         attr->show = base_attr->show;
 658                 if (!attr->store)
 659                         attr->store = base_attr->store;
 660         }
 661
 662         return device_create_file(dev, attr);
 663 }
 664
 665 /**
 666  * scsi_sysfs_add_sdev - add scsi device to sysfs
 667  * @sdev:       scsi_device to add
 668  *
 669  * Return value:
 670  *      0 on Success / non-zero on Failure
 671  **/
 672 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 673 {
 674         int error, i;
 675
 676         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 677                 return error;
 678
 679         error = device_add(&sdev->sdev_gendev);
 680         if (error) {
 681                 put_device(sdev->sdev_gendev.parent);
 682                 printk(KERN_INFO "error 1\n");
 683                 return error;
 684         }
 685         error = class_device_add(&sdev->sdev_classdev);
 686         if (error) {
 687                 printk(KERN_INFO "error 2\n");
 688                 goto clean_device;
 689         }
 690
 691         /* take a reference for the sdev_classdev; this is
 692          * released by the sdev_class .release */
 693         get_device(&sdev->sdev_gendev);
 694         if (sdev->host->hostt->sdev_attrs) {
 695                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 696                         error = attr_add(&sdev->sdev_gendev,
 697                                         sdev->host->hostt->sdev_attrs[i]);
 698                         if (error) {
 699                                 __scsi_remove_device(sdev);
 700                                 goto out;
 701                         }
 702                 }
 703         }
 704
 705         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 706                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 707                                         scsi_sysfs_sdev_attrs[i])) {
 708                         struct device_attribute * attr =
 709                                 attr_changed_internally(sdev->host,
 710                                                         scsi_sysfs_sdev_attrs[i]);
 711                         error = device_create_file(&sdev->sdev_gendev, attr);
 712                         if (error) {
 713                                 __scsi_remove_device(sdev);
 714                                 goto out;
 715                         }
 716                 }
 717         }
 718
 719         transport_add_device(&sdev->sdev_gendev);
 720  out:
 721         return error;
 722
 723  clean_device:
 724         scsi_device_set_state(sdev, SDEV_CANCEL);
 725
 726         device_del(&sdev->sdev_gendev);
 727         transport_destroy_device(&sdev->sdev_gendev);
 728         put_device(&sdev->sdev_gendev);
 729
 730         return error;
 731 }
 732
 733 void __scsi_remove_device(struct scsi_device *sdev)
 734 {
 735         struct device *dev = &sdev->sdev_gendev;
 736
 737         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 738                 return;
 739
 740         class_device_unregister(&sdev->sdev_classdev);
 741         transport_remove_device(dev);
 742         device_del(dev);
 743         scsi_device_set_state(sdev, SDEV_DEL);
 744         if (sdev->host->hostt->slave_destroy)
 745                 sdev->host->hostt->slave_destroy(sdev);
 746         transport_destroy_device(dev);
 747         put_device(dev);
 748 }
 749
 750 /**
 751  * scsi_remove_device - unregister a device from the scsi bus
 752  * @sdev:       scsi_device to unregister
 753  **/
 754 void scsi_remove_device(struct scsi_device *sdev)
 755 {
 756         struct Scsi_Host *shost = sdev->host;
 757
 758         mutex_lock(&shost->scan_mutex);
 759         __scsi_remove_device(sdev);
 760         mutex_unlock(&shost->scan_mutex);
 761 }
 762 EXPORT_SYMBOL(scsi_remove_device);
 763
 764 void __scsi_remove_target(struct scsi_target *starget)
 765 {
 766         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 767         unsigned long flags;
 768         struct scsi_device *sdev;
 769
 770         spin_lock_irqsave(shost->host_lock, flags);
 771         starget->reap_ref++;
 772  restart:
 773         list_for_each_entry(sdev, &shost->__devices, siblings) {
 774                 if (sdev->channel != starget->channel ||
 775                     sdev->id != starget->id ||
 776                     sdev->sdev_state == SDEV_DEL)
 777                         continue;
 778                 spin_unlock_irqrestore(shost->host_lock, flags);
 779                 scsi_remove_device(sdev);
 780                 spin_lock_irqsave(shost->host_lock, flags);
 781                 goto restart;
 782         }
 783         spin_unlock_irqrestore(shost->host_lock, flags);
 784         scsi_target_reap(starget);
 785 }
 786
 787 static int __remove_child (struct device * dev, void * data)
 788 {
 789         if (scsi_is_target_device(dev))
 790                 __scsi_remove_target(to_scsi_target(dev));
 791         return 0;
 792 }
 793
 794 /**
 795  * scsi_remove_target - try to remove a target and all its devices
 796  * @dev: generic starget or parent of generic stargets to be removed
 797  *
 798  * Note: This is slightly racy.  It is possible that if the user
 799  * requests the addition of another device then the target won't be
 800  * removed.
 801  */
 802 void scsi_remove_target(struct device *dev)
 803 {
 804         struct device *rdev;
 805
 806         if (scsi_is_target_device(dev)) {
 807                 __scsi_remove_target(to_scsi_target(dev));
 808                 return;
 809         }
 810
 811         rdev = get_device(dev);
 812         device_for_each_child(dev, NULL, __remove_child);
 813         put_device(rdev);
 814 }
 815 EXPORT_SYMBOL(scsi_remove_target);
 816
 817 int scsi_register_driver(struct device_driver *drv)
 818 {
 819         drv->bus = &scsi_bus_type;
 820
 821         return driver_register(drv);
 822 }
 823 EXPORT_SYMBOL(scsi_register_driver);
 824
 825 int scsi_register_interface(struct class_interface *intf)
 826 {
 827         intf->class = &sdev_class;
 828
 829         return class_interface_register(intf);
 830 }
 831 EXPORT_SYMBOL(scsi_register_interface);
 832
 833
 834 static struct class_device_attribute *class_attr_overridden(
 835                 struct class_device_attribute **attrs,
 836                 struct class_device_attribute *attr)
 837 {
 838         int i;
 839
 840         if (!attrs)
 841                 return NULL;
 842         for (i = 0; attrs[i]; i++)
 843                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 844                         return attrs[i];
 845         return NULL;
 846 }
 847
 848 static int class_attr_add(struct class_device *classdev,
 849                 struct class_device_attribute *attr)
 850 {
 851         struct class_device_attribute *base_attr;
 852
 853         /*
 854          * Spare the caller from having to copy things it's not interested in.
 855          */
 856         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 857         if (base_attr) {
 858                 /* extend permissions */
 859                 attr->attr.mode |= base_attr->attr.mode;
 860
 861                 /* override null show/store with default */
 862                 if (!attr->show)
 863                         attr->show = base_attr->show;
 864                 if (!attr->store)
 865                         attr->store = base_attr->store;
 866         }
 867
 868         return class_device_create_file(classdev, attr);
 869 }
 870
 871 /**
 872  * scsi_sysfs_add_host - add scsi host to subsystem
 873  * @shost:     scsi host struct to add to subsystem
 874  * @dev:       parent struct device pointer
 875  **/
 876 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 877 {
 878         int error, i;
 879
 880         if (shost->hostt->shost_attrs) {
 881                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 882                         error = class_attr_add(&shost->shost_classdev,
 883                                         shost->hostt->shost_attrs[i]);
 884                         if (error)
 885                                 return error;
 886                 }
 887         }
 888
 889         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 890                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 891                                         scsi_sysfs_shost_attrs[i])) {
 892                         error = class_device_create_file(&shost->shost_classdev,
 893                                         scsi_sysfs_shost_attrs[i]);
 894                         if (error)
 895                                 return error;
 896                 }
 897         }
 898
 899         transport_register_device(&shost->shost_gendev);
 900         return 0;
 901 }
 902
 903 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 904 {
 905         unsigned long flags;
 906         struct Scsi_Host *shost = sdev->host;
 907         struct scsi_target  *starget = sdev->sdev_target;
 908
 909         device_initialize(&sdev->sdev_gendev);
 910         sdev->sdev_gendev.bus = &scsi_bus_type;
 911         sdev->sdev_gendev.release = scsi_device_dev_release;
 912         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 913                 sdev->host->host_no, sdev->channel, sdev->id,
 914                 sdev->lun);
 915
 916         class_device_initialize(&sdev->sdev_classdev);
 917         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 918         sdev->sdev_classdev.class = &sdev_class;
 919         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 920                  "%d:%d:%d:%d", sdev->host->host_no,
 921                  sdev->channel, sdev->id, sdev->lun);
 922         sdev->scsi_level = SCSI_2;
 923         transport_setup_device(&sdev->sdev_gendev);
 924         spin_lock_irqsave(shost->host_lock, flags);
 925         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 926         list_add_tail(&sdev->siblings, &shost->__devices);
 927         spin_unlock_irqrestore(shost->host_lock, flags);
 928 }
 929
 930 int scsi_is_sdev_device(const struct device *dev)
 931 {
 932         return dev->release == scsi_device_dev_release;
 933 }
 934 EXPORT_SYMBOL(scsi_is_sdev_device);
 935
 936 /* A blank transport template that is used in drivers that don't
 937  * yet implement Transport Attributes */
 938 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };