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