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         if (boot_kobj->release)
  68                 boot_kobj->release(boot_kobj->data);
  69         kfree(boot_kobj);
  70 }
  71
  72 static struct kobj_type iscsi_boot_ktype = {
  73         .release = iscsi_boot_kobj_release,
  74         .sysfs_ops = &iscsi_boot_attr_ops,
  75 };
  76
  77 #define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type)               \
  78 static struct iscsi_boot_attr iscsi_boot_attr_##fnname = {      \
  79         .attr   = { .name = __stringify(sysfs_name), .mode = 0444 },    \
  80         .type   = attr_type,                                            \
  81 }
  82
  83 /* Target attrs */
  84 iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
  85 iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
  86 iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
  87 iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
  88 iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
  89 iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
  90 iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
  91 iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
  92 iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
  93 iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
  94 iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
  95                    ISCSI_BOOT_TGT_REV_CHAP_NAME);
  96 iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
  97                    ISCSI_BOOT_TGT_REV_CHAP_SECRET);
  98
  99 static struct attribute *target_attrs[] = {
 100         &iscsi_boot_attr_tgt_index.attr,
 101         &iscsi_boot_attr_tgt_flags.attr,
 102         &iscsi_boot_attr_tgt_ip.attr,
 103         &iscsi_boot_attr_tgt_port.attr,
 104         &iscsi_boot_attr_tgt_lun.attr,
 105         &iscsi_boot_attr_tgt_chap.attr,
 106         &iscsi_boot_attr_tgt_nic.attr,
 107         &iscsi_boot_attr_tgt_name.attr,
 108         &iscsi_boot_attr_tgt_chap_name.attr,
 109         &iscsi_boot_attr_tgt_chap_secret.attr,
 110         &iscsi_boot_attr_tgt_chap_rev_name.attr,
 111         &iscsi_boot_attr_tgt_chap_rev_secret.attr,
 112         NULL
 113 };
 114
 115 static mode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
 116                                              struct attribute *attr, int i)
 117 {
 118         struct iscsi_boot_kobj *boot_kobj =
 119                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 120
 121         if (attr ==  &iscsi_boot_attr_tgt_index.attr)
 122                 return boot_kobj->is_visible(boot_kobj->data,
 123                                              ISCSI_BOOT_TGT_INDEX);
 124         else if (attr == &iscsi_boot_attr_tgt_flags.attr)
 125                 return boot_kobj->is_visible(boot_kobj->data,
 126                                              ISCSI_BOOT_TGT_FLAGS);
 127         else if (attr == &iscsi_boot_attr_tgt_ip.attr)
 128                 return boot_kobj->is_visible(boot_kobj->data,
 129                                               ISCSI_BOOT_TGT_IP_ADDR);
 130         else if (attr == &iscsi_boot_attr_tgt_port.attr)
 131                 return boot_kobj->is_visible(boot_kobj->data,
 132                                               ISCSI_BOOT_TGT_PORT);
 133         else if (attr == &iscsi_boot_attr_tgt_lun.attr)
 134                 return boot_kobj->is_visible(boot_kobj->data,
 135                                               ISCSI_BOOT_TGT_LUN);
 136         else if (attr == &iscsi_boot_attr_tgt_chap.attr)
 137                 return boot_kobj->is_visible(boot_kobj->data,
 138                                              ISCSI_BOOT_TGT_CHAP_TYPE);
 139         else if (attr == &iscsi_boot_attr_tgt_nic.attr)
 140                 return boot_kobj->is_visible(boot_kobj->data,
 141                                              ISCSI_BOOT_TGT_NIC_ASSOC);
 142         else if (attr == &iscsi_boot_attr_tgt_name.attr)
 143                 return boot_kobj->is_visible(boot_kobj->data,
 144                                              ISCSI_BOOT_TGT_NAME);
 145         else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
 146                 return boot_kobj->is_visible(boot_kobj->data,
 147                                              ISCSI_BOOT_TGT_CHAP_NAME);
 148         else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
 149                 return boot_kobj->is_visible(boot_kobj->data,
 150                                              ISCSI_BOOT_TGT_CHAP_SECRET);
 151         else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
 152                 return boot_kobj->is_visible(boot_kobj->data,
 153                                              ISCSI_BOOT_TGT_REV_CHAP_NAME);
 154         else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
 155                 return boot_kobj->is_visible(boot_kobj->data,
 156                                              ISCSI_BOOT_TGT_REV_CHAP_SECRET);
 157         return 0;
 158 }
 159
 160 static struct attribute_group iscsi_boot_target_attr_group = {
 161         .attrs = target_attrs,
 162         .is_visible = iscsi_boot_tgt_attr_is_visible,
 163 };
 164
 165 /* Ethernet attrs */
 166 iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
 167 iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
 168 iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
 169 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
 170 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
 171 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
 172 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
 173 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
 174                    ISCSI_BOOT_ETH_SECONDARY_DNS);
 175 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
 176 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
 177 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
 178 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
 179
 180 static struct attribute *ethernet_attrs[] = {
 181         &iscsi_boot_attr_eth_index.attr,
 182         &iscsi_boot_attr_eth_flags.attr,
 183         &iscsi_boot_attr_eth_ip.attr,
 184         &iscsi_boot_attr_eth_subnet.attr,
 185         &iscsi_boot_attr_eth_origin.attr,
 186         &iscsi_boot_attr_eth_gateway.attr,
 187         &iscsi_boot_attr_eth_primary_dns.attr,
 188         &iscsi_boot_attr_eth_secondary_dns.attr,
 189         &iscsi_boot_attr_eth_dhcp.attr,
 190         &iscsi_boot_attr_eth_vlan.attr,
 191         &iscsi_boot_attr_eth_mac.attr,
 192         &iscsi_boot_attr_eth_hostname.attr,
 193         NULL
 194 };
 195
 196 static mode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
 197                                              struct attribute *attr, int i)
 198 {
 199         struct iscsi_boot_kobj *boot_kobj =
 200                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 201
 202         if (attr ==  &iscsi_boot_attr_eth_index.attr)
 203                 return boot_kobj->is_visible(boot_kobj->data,
 204                                              ISCSI_BOOT_ETH_INDEX);
 205         else if (attr ==  &iscsi_boot_attr_eth_flags.attr)
 206                 return boot_kobj->is_visible(boot_kobj->data,
 207                                              ISCSI_BOOT_ETH_FLAGS);
 208         else if (attr ==  &iscsi_boot_attr_eth_ip.attr)
 209                 return boot_kobj->is_visible(boot_kobj->data,
 210                                              ISCSI_BOOT_ETH_IP_ADDR);
 211         else if (attr ==  &iscsi_boot_attr_eth_subnet.attr)
 212                 return boot_kobj->is_visible(boot_kobj->data,
 213                                              ISCSI_BOOT_ETH_SUBNET_MASK);
 214         else if (attr ==  &iscsi_boot_attr_eth_origin.attr)
 215                 return boot_kobj->is_visible(boot_kobj->data,
 216                                              ISCSI_BOOT_ETH_ORIGIN);
 217         else if (attr ==  &iscsi_boot_attr_eth_gateway.attr)
 218                 return boot_kobj->is_visible(boot_kobj->data,
 219                                              ISCSI_BOOT_ETH_GATEWAY);
 220         else if (attr ==  &iscsi_boot_attr_eth_primary_dns.attr)
 221                 return boot_kobj->is_visible(boot_kobj->data,
 222                                              ISCSI_BOOT_ETH_PRIMARY_DNS);
 223         else if (attr ==  &iscsi_boot_attr_eth_secondary_dns.attr)
 224                 return boot_kobj->is_visible(boot_kobj->data,
 225                                              ISCSI_BOOT_ETH_SECONDARY_DNS);
 226         else if (attr ==  &iscsi_boot_attr_eth_dhcp.attr)
 227                 return boot_kobj->is_visible(boot_kobj->data,
 228                                              ISCSI_BOOT_ETH_DHCP);
 229         else if (attr ==  &iscsi_boot_attr_eth_vlan.attr)
 230                 return boot_kobj->is_visible(boot_kobj->data,
 231                                              ISCSI_BOOT_ETH_VLAN);
 232         else if (attr ==  &iscsi_boot_attr_eth_mac.attr)
 233                 return boot_kobj->is_visible(boot_kobj->data,
 234                                              ISCSI_BOOT_ETH_MAC);
 235         else if (attr ==  &iscsi_boot_attr_eth_hostname.attr)
 236                 return boot_kobj->is_visible(boot_kobj->data,
 237                                              ISCSI_BOOT_ETH_HOSTNAME);
 238         return 0;
 239 }
 240
 241 static struct attribute_group iscsi_boot_ethernet_attr_group = {
 242         .attrs = ethernet_attrs,
 243         .is_visible = iscsi_boot_eth_attr_is_visible,
 244 };
 245
 246 /* Initiator attrs */
 247 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
 248 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
 249 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
 250 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
 251 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
 252                    ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 253 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
 254                    ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 255 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
 256
 257 static struct attribute *initiator_attrs[] = {
 258         &iscsi_boot_attr_ini_index.attr,
 259         &iscsi_boot_attr_ini_flags.attr,
 260         &iscsi_boot_attr_ini_isns.attr,
 261         &iscsi_boot_attr_ini_slp.attr,
 262         &iscsi_boot_attr_ini_primary_radius.attr,
 263         &iscsi_boot_attr_ini_secondary_radius.attr,
 264         &iscsi_boot_attr_ini_name.attr,
 265         NULL
 266 };
 267
 268 static mode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
 269                                              struct attribute *attr, int i)
 270 {
 271         struct iscsi_boot_kobj *boot_kobj =
 272                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 273
 274         if (attr ==  &iscsi_boot_attr_ini_index.attr)
 275                 return boot_kobj->is_visible(boot_kobj->data,
 276                                              ISCSI_BOOT_INI_INDEX);
 277         if (attr ==  &iscsi_boot_attr_ini_flags.attr)
 278                 return boot_kobj->is_visible(boot_kobj->data,
 279                                              ISCSI_BOOT_INI_FLAGS);
 280         if (attr ==  &iscsi_boot_attr_ini_isns.attr)
 281                 return boot_kobj->is_visible(boot_kobj->data,
 282                                              ISCSI_BOOT_INI_ISNS_SERVER);
 283         if (attr ==  &iscsi_boot_attr_ini_slp.attr)
 284                 return boot_kobj->is_visible(boot_kobj->data,
 285                                              ISCSI_BOOT_INI_SLP_SERVER);
 286         if (attr ==  &iscsi_boot_attr_ini_primary_radius.attr)
 287                 return boot_kobj->is_visible(boot_kobj->data,
 288                                              ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 289         if (attr ==  &iscsi_boot_attr_ini_secondary_radius.attr)
 290                 return boot_kobj->is_visible(boot_kobj->data,
 291                                              ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 292         if (attr ==  &iscsi_boot_attr_ini_name.attr)
 293                 return boot_kobj->is_visible(boot_kobj->data,
 294                                              ISCSI_BOOT_INI_INITIATOR_NAME);
 295
 296         return 0;
 297 }
 298
 299 static struct attribute_group iscsi_boot_initiator_attr_group = {
 300         .attrs = initiator_attrs,
 301         .is_visible = iscsi_boot_ini_attr_is_visible,
 302 };
 303
 304 static struct iscsi_boot_kobj *
 305 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 306                        struct attribute_group *attr_group,
 307                        const char *name, int index, void *data,
 308                        ssize_t (*show) (void *data, int type, char *buf),
 309                        mode_t (*is_visible) (void *data, int type),
 310                        void (*release) (void *data))
 311 {
 312         struct iscsi_boot_kobj *boot_kobj;
 313
 314         boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
 315         if (!boot_kobj)
 316                 return NULL;
 317         INIT_LIST_HEAD(&boot_kobj->list);
 318
 319         boot_kobj->kobj.kset = boot_kset->kset;
 320         if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
 321                                  NULL, name, index)) {
 322                 kfree(boot_kobj);
 323                 return NULL;
 324         }
 325         boot_kobj->data = data;
 326         boot_kobj->show = show;
 327         boot_kobj->is_visible = is_visible;
 328         boot_kobj->release = release;
 329
 330         if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
 331                 /*
 332                  * We do not want to free this because the caller
 333                  * will assume that since the creation call failed
 334                  * the boot kobj was not setup and the normal release
 335                  * path is not being run.
 336                  */
 337                 boot_kobj->release = NULL;
 338                 kobject_put(&boot_kobj->kobj);
 339                 return NULL;
 340         }
 341         boot_kobj->attr_group = attr_group;
 342
 343         kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
 344         /* Nothing broke so lets add it to the list. */
 345         list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
 346         return boot_kobj;
 347 }
 348
 349 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
 350 {
 351         list_del(&boot_kobj->list);
 352         sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
 353         kobject_put(&boot_kobj->kobj);
 354 }
 355
 356 /**
 357  * iscsi_boot_create_target() - create boot target sysfs dir
 358  * @boot_kset: boot kset
 359  * @index: the target id
 360  * @data: driver specific data for target
 361  * @show: attr show function
 362  * @is_visible: attr visibility function
 363  * @release: release function
 364  *
 365  * Note: The boot sysfs lib will free the data passed in for the caller
 366  * when all refs to the target kobject have been released.
 367  */
 368 struct iscsi_boot_kobj *
 369 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 370                          void *data,
 371                          ssize_t (*show) (void *data, int type, char *buf),
 372                          mode_t (*is_visible) (void *data, int type),
 373                          void (*release) (void *data))
 374 {
 375         return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
 376                                       "target%d", index, data, show, is_visible,
 377                                       release);
 378 }
 379 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
 380
 381 /**
 382  * iscsi_boot_create_initiator() - create boot initiator sysfs dir
 383  * @boot_kset: boot kset
 384  * @index: the initiator id
 385  * @data: driver specific data
 386  * @show: attr show function
 387  * @is_visible: attr visibility function
 388  * @release: release function
 389  *
 390  * Note: The boot sysfs lib will free the data passed in for the caller
 391  * when all refs to the initiator kobject have been released.
 392  */
 393 struct iscsi_boot_kobj *
 394 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 395                             void *data,
 396                             ssize_t (*show) (void *data, int type, char *buf),
 397                             mode_t (*is_visible) (void *data, int type),
 398                             void (*release) (void *data))
 399 {
 400         return iscsi_boot_create_kobj(boot_kset,
 401                                       &iscsi_boot_initiator_attr_group,
 402                                       "initiator", index, data, show,
 403                                       is_visible, release);
 404 }
 405 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
 406
 407 /**
 408  * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
 409  * @boot_kset: boot kset
 410  * @index: the ethernet device id
 411  * @data: driver specific data
 412  * @show: attr show function
 413  * @is_visible: attr visibility function
 414  * @release: release function
 415  *
 416  * Note: The boot sysfs lib will free the data passed in for the caller
 417  * when all refs to the ethernet kobject have been released.
 418  */
 419 struct iscsi_boot_kobj *
 420 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 421                            void *data,
 422                            ssize_t (*show) (void *data, int type, char *buf),
 423                            mode_t (*is_visible) (void *data, int type),
 424                            void (*release) (void *data))
 425 {
 426         return iscsi_boot_create_kobj(boot_kset,
 427                                       &iscsi_boot_ethernet_attr_group,
 428                                       "ethernet%d", index, data, show,
 429                                       is_visible, release);
 430 }
 431 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
 432
 433 /**
 434  * iscsi_boot_create_kset() - creates root sysfs tree
 435  * @set_name: name of root dir
 436  */
 437 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
 438 {
 439         struct iscsi_boot_kset *boot_kset;
 440
 441         boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
 442         if (!boot_kset)
 443                 return NULL;
 444
 445         boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
 446         if (!boot_kset->kset) {
 447                 kfree(boot_kset);
 448                 return NULL;
 449         }
 450
 451         INIT_LIST_HEAD(&boot_kset->kobj_list);
 452         return boot_kset;
 453 }
 454 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
 455
 456 /**
 457  * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
 458  * @hostno: host number of scsi host
 459  */
 460 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
 461 {
 462         struct iscsi_boot_kset *boot_kset;
 463         char *set_name;
 464
 465         set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
 466         if (!set_name)
 467                 return NULL;
 468
 469         boot_kset = iscsi_boot_create_kset(set_name);
 470         kfree(set_name);
 471         return boot_kset;
 472 }
 473 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
 474
 475 /**
 476  * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
 477  * @boot_kset: boot kset
 478  *
 479  * This will remove the kset and kobjects and attrs under it.
 480  */
 481 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
 482 {
 483         struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
 484
 485         if (!boot_kset)
 486                 return;
 487
 488         list_for_each_entry_safe(boot_kobj, tmp_kobj,
 489                                  &boot_kset->kobj_list, list)
 490                 iscsi_boot_remove_kobj(boot_kobj);
 491
 492         kset_unregister(boot_kset->kset);
 493 }
 494 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);