drivers/scsi/iscsi_boot_sysfs.c

   1 /*
   2  * Export the iSCSI boot info to userland via sysfs.
   3  *
   4  * Copyright (C) 2010 Red Hat, Inc.  All rights reserved.
   5  * Copyright (C) 2010 Mike Christie
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License v2.0 as published by
   9  * the Free Software Foundation
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/string.h>
  19 #include <linux/slab.h>
  20 #include <linux/sysfs.h>
  21 #include <linux/capability.h>
  22 #include <linux/iscsi_boot_sysfs.h>
  23
  24
  25 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
  26 MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
  27 MODULE_LICENSE("GPL");
  28 /*
  29  * The kobject and attribute structures.
  30  */
  31 struct iscsi_boot_attr {
  32         struct attribute attr;
  33         int type;
  34         ssize_t (*show) (void *data, int type, char *buf);
  35 };
  36
  37 /*
  38  * The routine called for all sysfs attributes.
  39  */
  40 static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
  41                                          struct attribute *attr, char *buf)
  42 {
  43         struct iscsi_boot_kobj *boot_kobj =
  44                         container_of(kobj, struct iscsi_boot_kobj, kobj);
  45         struct iscsi_boot_attr *boot_attr =
  46                         container_of(attr, struct iscsi_boot_attr, attr);
  47         ssize_t ret = -EIO;
  48         char *str = buf;
  49
  50         if (!capable(CAP_SYS_ADMIN))
  51                 return -EACCES;
  52
  53         if (boot_kobj->show)
  54                 ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
  55         return ret;
  56 }
  57
  58 static const struct sysfs_ops iscsi_boot_attr_ops = {
  59         .show = iscsi_boot_show_attribute,
  60 };
  61
  62 static void iscsi_boot_kobj_release(struct kobject *kobj)
  63 {
  64         struct iscsi_boot_kobj *boot_kobj =
  65                         container_of(kobj, struct iscsi_boot_kobj, kobj);
  66
  67         kfree(boot_kobj->data);
  68         kfree(boot_kobj);
  69 }
  70
  71 static struct kobj_type iscsi_boot_ktype = {
  72         .release = iscsi_boot_kobj_release,
  73         .sysfs_ops = &iscsi_boot_attr_ops,
  74 };
  75
  76 #define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type)               \
  77 static struct iscsi_boot_attr iscsi_boot_attr_##fnname = {      \
  78         .attr   = { .name = __stringify(sysfs_name), .mode = 0444 },    \
  79         .type   = attr_type,                                            \
  80 }
  81
  82 /* Target attrs */
  83 iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
  84 iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
  85 iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
  86 iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
  87 iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
  88 iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
  89 iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
  90 iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
  91 iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
  92 iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
  93 iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
  94                    ISCSI_BOOT_TGT_REV_CHAP_NAME);
  95 iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
  96                    ISCSI_BOOT_TGT_REV_CHAP_SECRET);
  97
  98 static struct attribute *target_attrs[] = {
  99         &iscsi_boot_attr_tgt_index.attr,
 100         &iscsi_boot_attr_tgt_flags.attr,
 101         &iscsi_boot_attr_tgt_ip.attr,
 102         &iscsi_boot_attr_tgt_port.attr,
 103         &iscsi_boot_attr_tgt_lun.attr,
 104         &iscsi_boot_attr_tgt_chap.attr,
 105         &iscsi_boot_attr_tgt_nic.attr,
 106         &iscsi_boot_attr_tgt_name.attr,
 107         &iscsi_boot_attr_tgt_chap_name.attr,
 108         &iscsi_boot_attr_tgt_chap_secret.attr,
 109         &iscsi_boot_attr_tgt_chap_rev_name.attr,
 110         &iscsi_boot_attr_tgt_chap_rev_secret.attr,
 111         NULL
 112 };
 113
 114 static mode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
 115                                              struct attribute *attr, int i)
 116 {
 117         struct iscsi_boot_kobj *boot_kobj =
 118                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 119
 120         if (attr ==  &iscsi_boot_attr_tgt_index.attr)
 121                 return boot_kobj->is_visible(boot_kobj->data,
 122                                              ISCSI_BOOT_TGT_INDEX);
 123         else if (attr == &iscsi_boot_attr_tgt_flags.attr)
 124                 return boot_kobj->is_visible(boot_kobj->data,
 125                                              ISCSI_BOOT_TGT_FLAGS);
 126         else if (attr == &iscsi_boot_attr_tgt_ip.attr)
 127                 return boot_kobj->is_visible(boot_kobj->data,
 128                                               ISCSI_BOOT_TGT_IP_ADDR);
 129         else if (attr == &iscsi_boot_attr_tgt_port.attr)
 130                 return boot_kobj->is_visible(boot_kobj->data,
 131                                               ISCSI_BOOT_TGT_PORT);
 132         else if (attr == &iscsi_boot_attr_tgt_lun.attr)
 133                 return boot_kobj->is_visible(boot_kobj->data,
 134                                               ISCSI_BOOT_TGT_LUN);
 135         else if (attr == &iscsi_boot_attr_tgt_chap.attr)
 136                 return boot_kobj->is_visible(boot_kobj->data,
 137                                              ISCSI_BOOT_TGT_CHAP_TYPE);
 138         else if (attr == &iscsi_boot_attr_tgt_nic.attr)
 139                 return boot_kobj->is_visible(boot_kobj->data,
 140                                              ISCSI_BOOT_TGT_NIC_ASSOC);
 141         else if (attr == &iscsi_boot_attr_tgt_name.attr)
 142                 return boot_kobj->is_visible(boot_kobj->data,
 143                                              ISCSI_BOOT_TGT_NAME);
 144         else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
 145                 return boot_kobj->is_visible(boot_kobj->data,
 146                                              ISCSI_BOOT_TGT_CHAP_NAME);
 147         else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
 148                 return boot_kobj->is_visible(boot_kobj->data,
 149                                              ISCSI_BOOT_TGT_CHAP_SECRET);
 150         else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
 151                 return boot_kobj->is_visible(boot_kobj->data,
 152                                              ISCSI_BOOT_TGT_REV_CHAP_NAME);
 153         else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
 154                 return boot_kobj->is_visible(boot_kobj->data,
 155                                              ISCSI_BOOT_TGT_REV_CHAP_SECRET);
 156         return 0;
 157 }
 158
 159 static struct attribute_group iscsi_boot_target_attr_group = {
 160         .attrs = target_attrs,
 161         .is_visible = iscsi_boot_tgt_attr_is_visible,
 162 };
 163
 164 /* Ethernet attrs */
 165 iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
 166 iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
 167 iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
 168 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
 169 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
 170 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
 171 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
 172 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
 173                    ISCSI_BOOT_ETH_SECONDARY_DNS);
 174 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
 175 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
 176 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
 177 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
 178
 179 static struct attribute *ethernet_attrs[] = {
 180         &iscsi_boot_attr_eth_index.attr,
 181         &iscsi_boot_attr_eth_flags.attr,
 182         &iscsi_boot_attr_eth_ip.attr,
 183         &iscsi_boot_attr_eth_subnet.attr,
 184         &iscsi_boot_attr_eth_origin.attr,
 185         &iscsi_boot_attr_eth_gateway.attr,
 186         &iscsi_boot_attr_eth_primary_dns.attr,
 187         &iscsi_boot_attr_eth_secondary_dns.attr,
 188         &iscsi_boot_attr_eth_dhcp.attr,
 189         &iscsi_boot_attr_eth_vlan.attr,
 190         &iscsi_boot_attr_eth_mac.attr,
 191         &iscsi_boot_attr_eth_hostname.attr,
 192         NULL
 193 };
 194
 195 static mode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
 196                                              struct attribute *attr, int i)
 197 {
 198         struct iscsi_boot_kobj *boot_kobj =
 199                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 200
 201         if (attr ==  &iscsi_boot_attr_eth_index.attr)
 202                 return boot_kobj->is_visible(boot_kobj->data,
 203                                              ISCSI_BOOT_ETH_INDEX);
 204         else if (attr ==  &iscsi_boot_attr_eth_flags.attr)
 205                 return boot_kobj->is_visible(boot_kobj->data,
 206                                              ISCSI_BOOT_ETH_FLAGS);
 207         else if (attr ==  &iscsi_boot_attr_eth_ip.attr)
 208                 return boot_kobj->is_visible(boot_kobj->data,
 209                                              ISCSI_BOOT_ETH_IP_ADDR);
 210         else if (attr ==  &iscsi_boot_attr_eth_subnet.attr)
 211                 return boot_kobj->is_visible(boot_kobj->data,
 212                                              ISCSI_BOOT_ETH_SUBNET_MASK);
 213         else if (attr ==  &iscsi_boot_attr_eth_origin.attr)
 214                 return boot_kobj->is_visible(boot_kobj->data,
 215                                              ISCSI_BOOT_ETH_ORIGIN);
 216         else if (attr ==  &iscsi_boot_attr_eth_gateway.attr)
 217                 return boot_kobj->is_visible(boot_kobj->data,
 218                                              ISCSI_BOOT_ETH_GATEWAY);
 219         else if (attr ==  &iscsi_boot_attr_eth_primary_dns.attr)
 220                 return boot_kobj->is_visible(boot_kobj->data,
 221                                              ISCSI_BOOT_ETH_PRIMARY_DNS);
 222         else if (attr ==  &iscsi_boot_attr_eth_secondary_dns.attr)
 223                 return boot_kobj->is_visible(boot_kobj->data,
 224                                              ISCSI_BOOT_ETH_SECONDARY_DNS);
 225         else if (attr ==  &iscsi_boot_attr_eth_dhcp.attr)
 226                 return boot_kobj->is_visible(boot_kobj->data,
 227                                              ISCSI_BOOT_ETH_DHCP);
 228         else if (attr ==  &iscsi_boot_attr_eth_vlan.attr)
 229                 return boot_kobj->is_visible(boot_kobj->data,
 230                                              ISCSI_BOOT_ETH_VLAN);
 231         else if (attr ==  &iscsi_boot_attr_eth_mac.attr)
 232                 return boot_kobj->is_visible(boot_kobj->data,
 233                                              ISCSI_BOOT_ETH_MAC);
 234         else if (attr ==  &iscsi_boot_attr_eth_hostname.attr)
 235                 return boot_kobj->is_visible(boot_kobj->data,
 236                                              ISCSI_BOOT_ETH_HOSTNAME);
 237         return 0;
 238 }
 239
 240 static struct attribute_group iscsi_boot_ethernet_attr_group = {
 241         .attrs = ethernet_attrs,
 242         .is_visible = iscsi_boot_eth_attr_is_visible,
 243 };
 244
 245 /* Initiator attrs */
 246 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
 247 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
 248 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
 249 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
 250 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
 251                    ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 252 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
 253                    ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 254 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
 255
 256 static struct attribute *initiator_attrs[] = {
 257         &iscsi_boot_attr_ini_index.attr,
 258         &iscsi_boot_attr_ini_flags.attr,
 259         &iscsi_boot_attr_ini_isns.attr,
 260         &iscsi_boot_attr_ini_slp.attr,
 261         &iscsi_boot_attr_ini_primary_radius.attr,
 262         &iscsi_boot_attr_ini_secondary_radius.attr,
 263         &iscsi_boot_attr_ini_name.attr,
 264         NULL
 265 };
 266
 267 static mode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
 268                                              struct attribute *attr, int i)
 269 {
 270         struct iscsi_boot_kobj *boot_kobj =
 271                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 272
 273         if (attr ==  &iscsi_boot_attr_ini_index.attr)
 274                 return boot_kobj->is_visible(boot_kobj->data,
 275                                              ISCSI_BOOT_INI_INDEX);
 276         if (attr ==  &iscsi_boot_attr_ini_flags.attr)
 277                 return boot_kobj->is_visible(boot_kobj->data,
 278                                              ISCSI_BOOT_INI_FLAGS);
 279         if (attr ==  &iscsi_boot_attr_ini_isns.attr)
 280                 return boot_kobj->is_visible(boot_kobj->data,
 281                                              ISCSI_BOOT_INI_ISNS_SERVER);
 282         if (attr ==  &iscsi_boot_attr_ini_slp.attr)
 283                 return boot_kobj->is_visible(boot_kobj->data,
 284                                              ISCSI_BOOT_INI_SLP_SERVER);
 285         if (attr ==  &iscsi_boot_attr_ini_primary_radius.attr)
 286                 return boot_kobj->is_visible(boot_kobj->data,
 287                                              ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 288         if (attr ==  &iscsi_boot_attr_ini_secondary_radius.attr)
 289                 return boot_kobj->is_visible(boot_kobj->data,
 290                                              ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 291         if (attr ==  &iscsi_boot_attr_ini_name.attr)
 292                 return boot_kobj->is_visible(boot_kobj->data,
 293                                              ISCSI_BOOT_INI_INITIATOR_NAME);
 294
 295         return 0;
 296 }
 297
 298 static struct attribute_group iscsi_boot_initiator_attr_group = {
 299         .attrs = initiator_attrs,
 300         .is_visible = iscsi_boot_ini_attr_is_visible,
 301 };
 302
 303 static struct iscsi_boot_kobj *
 304 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 305                        struct attribute_group *attr_group,
 306                        const char *name, int index, void *data,
 307                        ssize_t (*show) (void *data, int type, char *buf),
 308                        mode_t (*is_visible) (void *data, int type))
 309 {
 310         struct iscsi_boot_kobj *boot_kobj;
 311
 312         boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
 313         if (!boot_kobj)
 314                 return NULL;
 315         INIT_LIST_HEAD(&boot_kobj->list);
 316
 317         boot_kobj->kobj.kset = boot_kset->kset;
 318         if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
 319                                  NULL, name, index)) {
 320                 kfree(boot_kobj);
 321                 return NULL;
 322         }
 323         boot_kobj->data = data;
 324         boot_kobj->show = show;
 325         boot_kobj->is_visible = is_visible;
 326
 327         if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
 328                 /*
 329                  * We do not want to free this because the caller
 330                  * will assume that since the creation call failed
 331                  * the boot kobj was not setup and the normal release
 332                  * path is not being run.
 333                  */
 334                 boot_kobj->data = NULL;
 335                 kobject_put(&boot_kobj->kobj);
 336                 return NULL;
 337         }
 338         boot_kobj->attr_group = attr_group;
 339
 340         kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
 341         /* Nothing broke so lets add it to the list. */
 342         list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
 343         return boot_kobj;
 344 }
 345
 346 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
 347 {
 348         list_del(&boot_kobj->list);
 349         sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
 350         kobject_put(&boot_kobj->kobj);
 351 }
 352
 353 /**
 354  * iscsi_boot_create_target() - create boot target sysfs dir
 355  * @boot_kset: boot kset
 356  * @index: the target id
 357  * @data: driver specific data for target
 358  * @show: attr show function
 359  * @is_visible: attr visibility function
 360  *
 361  * Note: The boot sysfs lib will free the data passed in for the caller
 362  * when all refs to the target kobject have been released.
 363  */
 364 struct iscsi_boot_kobj *
 365 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 366                          void *data,
 367                          ssize_t (*show) (void *data, int type, char *buf),
 368                          mode_t (*is_visible) (void *data, int type))
 369 {
 370         return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
 371                                       "target%d", index, data, show, is_visible);
 372 }
 373 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
 374
 375 /**
 376  * iscsi_boot_create_initiator() - create boot initiator sysfs dir
 377  * @boot_kset: boot kset
 378  * @index: the initiator id
 379  * @data: driver specific data
 380  * @show: attr show function
 381  * @is_visible: attr visibility function
 382  *
 383  * Note: The boot sysfs lib will free the data passed in for the caller
 384  * when all refs to the initiator kobject have been released.
 385  */
 386 struct iscsi_boot_kobj *
 387 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 388                             void *data,
 389                             ssize_t (*show) (void *data, int type, char *buf),
 390                             mode_t (*is_visible) (void *data, int type))
 391 {
 392         return iscsi_boot_create_kobj(boot_kset,
 393                                       &iscsi_boot_initiator_attr_group,
 394                                       "initiator", index, data, show,
 395                                       is_visible);
 396 }
 397 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
 398
 399 /**
 400  * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
 401  * @boot_kset: boot kset
 402  * @index: the ethernet device id
 403  * @data: driver specific data
 404  * @show: attr show function
 405  * @is_visible: attr visibility function
 406  *
 407  * Note: The boot sysfs lib will free the data passed in for the caller
 408  * when all refs to the ethernet kobject have been released.
 409  */
 410 struct iscsi_boot_kobj *
 411 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 412                            void *data,
 413                            ssize_t (*show) (void *data, int type, char *buf),
 414                            mode_t (*is_visible) (void *data, int type))
 415 {
 416         return iscsi_boot_create_kobj(boot_kset,
 417                                       &iscsi_boot_ethernet_attr_group,
 418                                       "ethernet%d", index, data, show,
 419                                       is_visible);
 420 }
 421 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
 422
 423 /**
 424  * iscsi_boot_create_kset() - creates root sysfs tree
 425  * @set_name: name of root dir
 426  */
 427 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
 428 {
 429         struct iscsi_boot_kset *boot_kset;
 430
 431         boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
 432         if (!boot_kset)
 433                 return NULL;
 434
 435         boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
 436         if (!boot_kset->kset) {
 437                 kfree(boot_kset);
 438                 return NULL;
 439         }
 440
 441         INIT_LIST_HEAD(&boot_kset->kobj_list);
 442         return boot_kset;
 443 }
 444 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
 445
 446 /**
 447  * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
 448  * @hostno: host number of scsi host
 449  */
 450 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
 451 {
 452         struct iscsi_boot_kset *boot_kset;
 453         char *set_name;
 454
 455         set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
 456         if (!set_name)
 457                 return NULL;
 458
 459         boot_kset = iscsi_boot_create_kset(set_name);
 460         kfree(set_name);
 461         return boot_kset;
 462 }
 463 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
 464
 465 /**
 466  * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
 467  * @boot_kset: boot kset
 468  *
 469  * This will remove the kset and kobjects and attrs under it.
 470  */
 471 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
 472 {
 473         struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
 474
 475         list_for_each_entry_safe(boot_kobj, tmp_kobj,
 476                                  &boot_kset->kobj_list, list)
 477                 iscsi_boot_remove_kobj(boot_kobj);
 478
 479         kset_unregister(boot_kset->kset);
 480 }
 481 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);