drivers/scsi/scsi_sysfs.c

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