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 umode_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_prefix, prefix-len, ISCSI_BOOT_ETH_PREFIX_LEN);
 170 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
 171 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
 172 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
 173 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
 174 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
 175                    ISCSI_BOOT_ETH_SECONDARY_DNS);
 176 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
 177 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
 178 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
 179 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
 180
 181 static struct attribute *ethernet_attrs[] = {
 182         &iscsi_boot_attr_eth_index.attr,
 183         &iscsi_boot_attr_eth_flags.attr,
 184         &iscsi_boot_attr_eth_ip.attr,
 185         &iscsi_boot_attr_eth_prefix.attr,
 186         &iscsi_boot_attr_eth_subnet.attr,
 187         &iscsi_boot_attr_eth_origin.attr,
 188         &iscsi_boot_attr_eth_gateway.attr,
 189         &iscsi_boot_attr_eth_primary_dns.attr,
 190         &iscsi_boot_attr_eth_secondary_dns.attr,
 191         &iscsi_boot_attr_eth_dhcp.attr,
 192         &iscsi_boot_attr_eth_vlan.attr,
 193         &iscsi_boot_attr_eth_mac.attr,
 194         &iscsi_boot_attr_eth_hostname.attr,
 195         NULL
 196 };
 197
 198 static umode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
 199                                              struct attribute *attr, int i)
 200 {
 201         struct iscsi_boot_kobj *boot_kobj =
 202                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 203
 204         if (attr ==  &iscsi_boot_attr_eth_index.attr)
 205                 return boot_kobj->is_visible(boot_kobj->data,
 206                                              ISCSI_BOOT_ETH_INDEX);
 207         else if (attr ==  &iscsi_boot_attr_eth_flags.attr)
 208                 return boot_kobj->is_visible(boot_kobj->data,
 209                                              ISCSI_BOOT_ETH_FLAGS);
 210         else if (attr ==  &iscsi_boot_attr_eth_ip.attr)
 211                 return boot_kobj->is_visible(boot_kobj->data,
 212                                              ISCSI_BOOT_ETH_IP_ADDR);
 213         else if (attr ==  &iscsi_boot_attr_eth_prefix.attr)
 214                 return boot_kobj->is_visible(boot_kobj->data,
 215                                              ISCSI_BOOT_ETH_PREFIX_LEN);
 216         else if (attr ==  &iscsi_boot_attr_eth_subnet.attr)
 217                 return boot_kobj->is_visible(boot_kobj->data,
 218                                              ISCSI_BOOT_ETH_SUBNET_MASK);
 219         else if (attr ==  &iscsi_boot_attr_eth_origin.attr)
 220                 return boot_kobj->is_visible(boot_kobj->data,
 221                                              ISCSI_BOOT_ETH_ORIGIN);
 222         else if (attr ==  &iscsi_boot_attr_eth_gateway.attr)
 223                 return boot_kobj->is_visible(boot_kobj->data,
 224                                              ISCSI_BOOT_ETH_GATEWAY);
 225         else if (attr ==  &iscsi_boot_attr_eth_primary_dns.attr)
 226                 return boot_kobj->is_visible(boot_kobj->data,
 227                                              ISCSI_BOOT_ETH_PRIMARY_DNS);
 228         else if (attr ==  &iscsi_boot_attr_eth_secondary_dns.attr)
 229                 return boot_kobj->is_visible(boot_kobj->data,
 230                                              ISCSI_BOOT_ETH_SECONDARY_DNS);
 231         else if (attr ==  &iscsi_boot_attr_eth_dhcp.attr)
 232                 return boot_kobj->is_visible(boot_kobj->data,
 233                                              ISCSI_BOOT_ETH_DHCP);
 234         else if (attr ==  &iscsi_boot_attr_eth_vlan.attr)
 235                 return boot_kobj->is_visible(boot_kobj->data,
 236                                              ISCSI_BOOT_ETH_VLAN);
 237         else if (attr ==  &iscsi_boot_attr_eth_mac.attr)
 238                 return boot_kobj->is_visible(boot_kobj->data,
 239                                              ISCSI_BOOT_ETH_MAC);
 240         else if (attr ==  &iscsi_boot_attr_eth_hostname.attr)
 241                 return boot_kobj->is_visible(boot_kobj->data,
 242                                              ISCSI_BOOT_ETH_HOSTNAME);
 243         return 0;
 244 }
 245
 246 static struct attribute_group iscsi_boot_ethernet_attr_group = {
 247         .attrs = ethernet_attrs,
 248         .is_visible = iscsi_boot_eth_attr_is_visible,
 249 };
 250
 251 /* Initiator attrs */
 252 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
 253 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
 254 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
 255 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
 256 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
 257                    ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 258 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
 259                    ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 260 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
 261
 262 static struct attribute *initiator_attrs[] = {
 263         &iscsi_boot_attr_ini_index.attr,
 264         &iscsi_boot_attr_ini_flags.attr,
 265         &iscsi_boot_attr_ini_isns.attr,
 266         &iscsi_boot_attr_ini_slp.attr,
 267         &iscsi_boot_attr_ini_primary_radius.attr,
 268         &iscsi_boot_attr_ini_secondary_radius.attr,
 269         &iscsi_boot_attr_ini_name.attr,
 270         NULL
 271 };
 272
 273 static umode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
 274                                              struct attribute *attr, int i)
 275 {
 276         struct iscsi_boot_kobj *boot_kobj =
 277                         container_of(kobj, struct iscsi_boot_kobj, kobj);
 278
 279         if (attr ==  &iscsi_boot_attr_ini_index.attr)
 280                 return boot_kobj->is_visible(boot_kobj->data,
 281                                              ISCSI_BOOT_INI_INDEX);
 282         if (attr ==  &iscsi_boot_attr_ini_flags.attr)
 283                 return boot_kobj->is_visible(boot_kobj->data,
 284                                              ISCSI_BOOT_INI_FLAGS);
 285         if (attr ==  &iscsi_boot_attr_ini_isns.attr)
 286                 return boot_kobj->is_visible(boot_kobj->data,
 287                                              ISCSI_BOOT_INI_ISNS_SERVER);
 288         if (attr ==  &iscsi_boot_attr_ini_slp.attr)
 289                 return boot_kobj->is_visible(boot_kobj->data,
 290                                              ISCSI_BOOT_INI_SLP_SERVER);
 291         if (attr ==  &iscsi_boot_attr_ini_primary_radius.attr)
 292                 return boot_kobj->is_visible(boot_kobj->data,
 293                                              ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 294         if (attr ==  &iscsi_boot_attr_ini_secondary_radius.attr)
 295                 return boot_kobj->is_visible(boot_kobj->data,
 296                                              ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 297         if (attr ==  &iscsi_boot_attr_ini_name.attr)
 298                 return boot_kobj->is_visible(boot_kobj->data,
 299                                              ISCSI_BOOT_INI_INITIATOR_NAME);
 300
 301         return 0;
 302 }
 303
 304 static struct attribute_group iscsi_boot_initiator_attr_group = {
 305         .attrs = initiator_attrs,
 306         .is_visible = iscsi_boot_ini_attr_is_visible,
 307 };
 308
 309 static struct iscsi_boot_kobj *
 310 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 311                        struct attribute_group *attr_group,
 312                        const char *name, int index, void *data,
 313                        ssize_t (*show) (void *data, int type, char *buf),
 314                        umode_t (*is_visible) (void *data, int type),
 315                        void (*release) (void *data))
 316 {
 317         struct iscsi_boot_kobj *boot_kobj;
 318
 319         boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
 320         if (!boot_kobj)
 321                 return NULL;
 322         INIT_LIST_HEAD(&boot_kobj->list);
 323
 324         boot_kobj->kobj.kset = boot_kset->kset;
 325         if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
 326                                  NULL, name, index)) {
 327                 kfree(boot_kobj);
 328                 return NULL;
 329         }
 330         boot_kobj->data = data;
 331         boot_kobj->show = show;
 332         boot_kobj->is_visible = is_visible;
 333         boot_kobj->release = release;
 334
 335         if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
 336                 /*
 337                  * We do not want to free this because the caller
 338                  * will assume that since the creation call failed
 339                  * the boot kobj was not setup and the normal release
 340                  * path is not being run.
 341                  */
 342                 boot_kobj->release = NULL;
 343                 kobject_put(&boot_kobj->kobj);
 344                 return NULL;
 345         }
 346         boot_kobj->attr_group = attr_group;
 347
 348         kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
 349         /* Nothing broke so lets add it to the list. */
 350         list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
 351         return boot_kobj;
 352 }
 353
 354 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
 355 {
 356         list_del(&boot_kobj->list);
 357         sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
 358         kobject_put(&boot_kobj->kobj);
 359 }
 360
 361 /**
 362  * iscsi_boot_create_target() - create boot target sysfs dir
 363  * @boot_kset: boot kset
 364  * @index: the target id
 365  * @data: driver specific data for target
 366  * @show: attr show function
 367  * @is_visible: attr visibility function
 368  * @release: release function
 369  *
 370  * Note: The boot sysfs lib will free the data passed in for the caller
 371  * when all refs to the target kobject have been released.
 372  */
 373 struct iscsi_boot_kobj *
 374 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 375                          void *data,
 376                          ssize_t (*show) (void *data, int type, char *buf),
 377                          umode_t (*is_visible) (void *data, int type),
 378                          void (*release) (void *data))
 379 {
 380         return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
 381                                       "target%d", index, data, show, is_visible,
 382                                       release);
 383 }
 384 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
 385
 386 /**
 387  * iscsi_boot_create_initiator() - create boot initiator sysfs dir
 388  * @boot_kset: boot kset
 389  * @index: the initiator id
 390  * @data: driver specific data
 391  * @show: attr show function
 392  * @is_visible: attr visibility function
 393  * @release: release function
 394  *
 395  * Note: The boot sysfs lib will free the data passed in for the caller
 396  * when all refs to the initiator kobject have been released.
 397  */
 398 struct iscsi_boot_kobj *
 399 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 400                             void *data,
 401                             ssize_t (*show) (void *data, int type, char *buf),
 402                             umode_t (*is_visible) (void *data, int type),
 403                             void (*release) (void *data))
 404 {
 405         return iscsi_boot_create_kobj(boot_kset,
 406                                       &iscsi_boot_initiator_attr_group,
 407                                       "initiator", index, data, show,
 408                                       is_visible, release);
 409 }
 410 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
 411
 412 /**
 413  * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
 414  * @boot_kset: boot kset
 415  * @index: the ethernet device id
 416  * @data: driver specific data
 417  * @show: attr show function
 418  * @is_visible: attr visibility function
 419  * @release: release function
 420  *
 421  * Note: The boot sysfs lib will free the data passed in for the caller
 422  * when all refs to the ethernet kobject have been released.
 423  */
 424 struct iscsi_boot_kobj *
 425 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 426                            void *data,
 427                            ssize_t (*show) (void *data, int type, char *buf),
 428                            umode_t (*is_visible) (void *data, int type),
 429                            void (*release) (void *data))
 430 {
 431         return iscsi_boot_create_kobj(boot_kset,
 432                                       &iscsi_boot_ethernet_attr_group,
 433                                       "ethernet%d", index, data, show,
 434                                       is_visible, release);
 435 }
 436 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
 437
 438 /**
 439  * iscsi_boot_create_kset() - creates root sysfs tree
 440  * @set_name: name of root dir
 441  */
 442 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
 443 {
 444         struct iscsi_boot_kset *boot_kset;
 445
 446         boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
 447         if (!boot_kset)
 448                 return NULL;
 449
 450         boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
 451         if (!boot_kset->kset) {
 452                 kfree(boot_kset);
 453                 return NULL;
 454         }
 455
 456         INIT_LIST_HEAD(&boot_kset->kobj_list);
 457         return boot_kset;
 458 }
 459 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
 460
 461 /**
 462  * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
 463  * @hostno: host number of scsi host
 464  */
 465 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
 466 {
 467         struct iscsi_boot_kset *boot_kset;
 468         char *set_name;
 469
 470         set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
 471         if (!set_name)
 472                 return NULL;
 473
 474         boot_kset = iscsi_boot_create_kset(set_name);
 475         kfree(set_name);
 476         return boot_kset;
 477 }
 478 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
 479
 480 /**
 481  * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
 482  * @boot_kset: boot kset
 483  *
 484  * This will remove the kset and kobjects and attrs under it.
 485  */
 486 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
 487 {
 488         struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
 489
 490         if (!boot_kset)
 491                 return;
 492
 493         list_for_each_entry_safe(boot_kobj, tmp_kobj,
 494                                  &boot_kset->kobj_list, list)
 495                 iscsi_boot_remove_kobj(boot_kobj);
 496
 497         kset_unregister(boot_kset->kset);
 498         kfree(boot_kset);
 499 }
 500 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);