iscsi_boot_sysfs.c 18 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Export the iSCSI boot info to userland via sysfs.
  4. *
  5. * Copyright (C) 2010 Red Hat, Inc. All rights reserved.
  6. * Copyright (C) 2010 Mike Christie
  7. */
  8. #include <linux/module.h>
  9. #include <linux/string.h>
  10. #include <linux/slab.h>
  11. #include <linux/sysfs.h>
  12. #include <linux/capability.h>
  13. #include <linux/iscsi_boot_sysfs.h>
  14. MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
  15. MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
  16. MODULE_LICENSE("GPL");
  17. /*
  18. * The kobject and attribute structures.
  19. */
  20. struct iscsi_boot_attr {
  21. struct attribute attr;
  22. int type;
  23. ssize_t (*show) (void *data, int type, char *buf);
  24. };
  25. /*
  26. * The routine called for all sysfs attributes.
  27. */
  28. static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
  29. struct attribute *attr, char *buf)
  30. {
  31. struct iscsi_boot_kobj *boot_kobj =
  32. container_of(kobj, struct iscsi_boot_kobj, kobj);
  33. struct iscsi_boot_attr *boot_attr =
  34. container_of(attr, struct iscsi_boot_attr, attr);
  35. ssize_t ret = -EIO;
  36. char *str = buf;
  37. if (!capable(CAP_SYS_ADMIN))
  38. return -EACCES;
  39. if (boot_kobj->show)
  40. ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
  41. return ret;
  42. }
  43. static const struct sysfs_ops iscsi_boot_attr_ops = {
  44. .show = iscsi_boot_show_attribute,
  45. };
  46. static void iscsi_boot_kobj_release(struct kobject *kobj)
  47. {
  48. struct iscsi_boot_kobj *boot_kobj =
  49. container_of(kobj, struct iscsi_boot_kobj, kobj);
  50. if (boot_kobj->release)
  51. boot_kobj->release(boot_kobj->data);
  52. kfree(boot_kobj);
  53. }
  54. static struct kobj_type iscsi_boot_ktype = {
  55. .release = iscsi_boot_kobj_release,
  56. .sysfs_ops = &iscsi_boot_attr_ops,
  57. };
  58. #define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type) \
  59. static struct iscsi_boot_attr iscsi_boot_attr_##fnname = { \
  60. .attr = { .name = __stringify(sysfs_name), .mode = 0444 }, \
  61. .type = attr_type, \
  62. }
  63. /* Target attrs */
  64. iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
  65. iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
  66. iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
  67. iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
  68. iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
  69. iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
  70. iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
  71. iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
  72. iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
  73. iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
  74. iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
  75. ISCSI_BOOT_TGT_REV_CHAP_NAME);
  76. iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
  77. ISCSI_BOOT_TGT_REV_CHAP_SECRET);
  78. static struct attribute *target_attrs[] = {
  79. &iscsi_boot_attr_tgt_index.attr,
  80. &iscsi_boot_attr_tgt_flags.attr,
  81. &iscsi_boot_attr_tgt_ip.attr,
  82. &iscsi_boot_attr_tgt_port.attr,
  83. &iscsi_boot_attr_tgt_lun.attr,
  84. &iscsi_boot_attr_tgt_chap.attr,
  85. &iscsi_boot_attr_tgt_nic.attr,
  86. &iscsi_boot_attr_tgt_name.attr,
  87. &iscsi_boot_attr_tgt_chap_name.attr,
  88. &iscsi_boot_attr_tgt_chap_secret.attr,
  89. &iscsi_boot_attr_tgt_chap_rev_name.attr,
  90. &iscsi_boot_attr_tgt_chap_rev_secret.attr,
  91. NULL
  92. };
  93. static umode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
  94. struct attribute *attr, int i)
  95. {
  96. struct iscsi_boot_kobj *boot_kobj =
  97. container_of(kobj, struct iscsi_boot_kobj, kobj);
  98. if (attr == &iscsi_boot_attr_tgt_index.attr)
  99. return boot_kobj->is_visible(boot_kobj->data,
  100. ISCSI_BOOT_TGT_INDEX);
  101. else if (attr == &iscsi_boot_attr_tgt_flags.attr)
  102. return boot_kobj->is_visible(boot_kobj->data,
  103. ISCSI_BOOT_TGT_FLAGS);
  104. else if (attr == &iscsi_boot_attr_tgt_ip.attr)
  105. return boot_kobj->is_visible(boot_kobj->data,
  106. ISCSI_BOOT_TGT_IP_ADDR);
  107. else if (attr == &iscsi_boot_attr_tgt_port.attr)
  108. return boot_kobj->is_visible(boot_kobj->data,
  109. ISCSI_BOOT_TGT_PORT);
  110. else if (attr == &iscsi_boot_attr_tgt_lun.attr)
  111. return boot_kobj->is_visible(boot_kobj->data,
  112. ISCSI_BOOT_TGT_LUN);
  113. else if (attr == &iscsi_boot_attr_tgt_chap.attr)
  114. return boot_kobj->is_visible(boot_kobj->data,
  115. ISCSI_BOOT_TGT_CHAP_TYPE);
  116. else if (attr == &iscsi_boot_attr_tgt_nic.attr)
  117. return boot_kobj->is_visible(boot_kobj->data,
  118. ISCSI_BOOT_TGT_NIC_ASSOC);
  119. else if (attr == &iscsi_boot_attr_tgt_name.attr)
  120. return boot_kobj->is_visible(boot_kobj->data,
  121. ISCSI_BOOT_TGT_NAME);
  122. else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
  123. return boot_kobj->is_visible(boot_kobj->data,
  124. ISCSI_BOOT_TGT_CHAP_NAME);
  125. else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
  126. return boot_kobj->is_visible(boot_kobj->data,
  127. ISCSI_BOOT_TGT_CHAP_SECRET);
  128. else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
  129. return boot_kobj->is_visible(boot_kobj->data,
  130. ISCSI_BOOT_TGT_REV_CHAP_NAME);
  131. else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
  132. return boot_kobj->is_visible(boot_kobj->data,
  133. ISCSI_BOOT_TGT_REV_CHAP_SECRET);
  134. return 0;
  135. }
  136. static struct attribute_group iscsi_boot_target_attr_group = {
  137. .attrs = target_attrs,
  138. .is_visible = iscsi_boot_tgt_attr_is_visible,
  139. };
  140. /* Ethernet attrs */
  141. iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
  142. iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
  143. iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
  144. iscsi_boot_rd_attr(eth_prefix, prefix-len, ISCSI_BOOT_ETH_PREFIX_LEN);
  145. iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
  146. iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
  147. iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
  148. iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
  149. iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
  150. ISCSI_BOOT_ETH_SECONDARY_DNS);
  151. iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
  152. iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
  153. iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
  154. iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
  155. static struct attribute *ethernet_attrs[] = {
  156. &iscsi_boot_attr_eth_index.attr,
  157. &iscsi_boot_attr_eth_flags.attr,
  158. &iscsi_boot_attr_eth_ip.attr,
  159. &iscsi_boot_attr_eth_prefix.attr,
  160. &iscsi_boot_attr_eth_subnet.attr,
  161. &iscsi_boot_attr_eth_origin.attr,
  162. &iscsi_boot_attr_eth_gateway.attr,
  163. &iscsi_boot_attr_eth_primary_dns.attr,
  164. &iscsi_boot_attr_eth_secondary_dns.attr,
  165. &iscsi_boot_attr_eth_dhcp.attr,
  166. &iscsi_boot_attr_eth_vlan.attr,
  167. &iscsi_boot_attr_eth_mac.attr,
  168. &iscsi_boot_attr_eth_hostname.attr,
  169. NULL
  170. };
  171. static umode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
  172. struct attribute *attr, int i)
  173. {
  174. struct iscsi_boot_kobj *boot_kobj =
  175. container_of(kobj, struct iscsi_boot_kobj, kobj);
  176. if (attr == &iscsi_boot_attr_eth_index.attr)
  177. return boot_kobj->is_visible(boot_kobj->data,
  178. ISCSI_BOOT_ETH_INDEX);
  179. else if (attr == &iscsi_boot_attr_eth_flags.attr)
  180. return boot_kobj->is_visible(boot_kobj->data,
  181. ISCSI_BOOT_ETH_FLAGS);
  182. else if (attr == &iscsi_boot_attr_eth_ip.attr)
  183. return boot_kobj->is_visible(boot_kobj->data,
  184. ISCSI_BOOT_ETH_IP_ADDR);
  185. else if (attr == &iscsi_boot_attr_eth_prefix.attr)
  186. return boot_kobj->is_visible(boot_kobj->data,
  187. ISCSI_BOOT_ETH_PREFIX_LEN);
  188. else if (attr == &iscsi_boot_attr_eth_subnet.attr)
  189. return boot_kobj->is_visible(boot_kobj->data,
  190. ISCSI_BOOT_ETH_SUBNET_MASK);
  191. else if (attr == &iscsi_boot_attr_eth_origin.attr)
  192. return boot_kobj->is_visible(boot_kobj->data,
  193. ISCSI_BOOT_ETH_ORIGIN);
  194. else if (attr == &iscsi_boot_attr_eth_gateway.attr)
  195. return boot_kobj->is_visible(boot_kobj->data,
  196. ISCSI_BOOT_ETH_GATEWAY);
  197. else if (attr == &iscsi_boot_attr_eth_primary_dns.attr)
  198. return boot_kobj->is_visible(boot_kobj->data,
  199. ISCSI_BOOT_ETH_PRIMARY_DNS);
  200. else if (attr == &iscsi_boot_attr_eth_secondary_dns.attr)
  201. return boot_kobj->is_visible(boot_kobj->data,
  202. ISCSI_BOOT_ETH_SECONDARY_DNS);
  203. else if (attr == &iscsi_boot_attr_eth_dhcp.attr)
  204. return boot_kobj->is_visible(boot_kobj->data,
  205. ISCSI_BOOT_ETH_DHCP);
  206. else if (attr == &iscsi_boot_attr_eth_vlan.attr)
  207. return boot_kobj->is_visible(boot_kobj->data,
  208. ISCSI_BOOT_ETH_VLAN);
  209. else if (attr == &iscsi_boot_attr_eth_mac.attr)
  210. return boot_kobj->is_visible(boot_kobj->data,
  211. ISCSI_BOOT_ETH_MAC);
  212. else if (attr == &iscsi_boot_attr_eth_hostname.attr)
  213. return boot_kobj->is_visible(boot_kobj->data,
  214. ISCSI_BOOT_ETH_HOSTNAME);
  215. return 0;
  216. }
  217. static struct attribute_group iscsi_boot_ethernet_attr_group = {
  218. .attrs = ethernet_attrs,
  219. .is_visible = iscsi_boot_eth_attr_is_visible,
  220. };
  221. /* Initiator attrs */
  222. iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
  223. iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
  224. iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
  225. iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
  226. iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
  227. ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
  228. iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
  229. ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
  230. iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
  231. static struct attribute *initiator_attrs[] = {
  232. &iscsi_boot_attr_ini_index.attr,
  233. &iscsi_boot_attr_ini_flags.attr,
  234. &iscsi_boot_attr_ini_isns.attr,
  235. &iscsi_boot_attr_ini_slp.attr,
  236. &iscsi_boot_attr_ini_primary_radius.attr,
  237. &iscsi_boot_attr_ini_secondary_radius.attr,
  238. &iscsi_boot_attr_ini_name.attr,
  239. NULL
  240. };
  241. static umode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
  242. struct attribute *attr, int i)
  243. {
  244. struct iscsi_boot_kobj *boot_kobj =
  245. container_of(kobj, struct iscsi_boot_kobj, kobj);
  246. if (attr == &iscsi_boot_attr_ini_index.attr)
  247. return boot_kobj->is_visible(boot_kobj->data,
  248. ISCSI_BOOT_INI_INDEX);
  249. if (attr == &iscsi_boot_attr_ini_flags.attr)
  250. return boot_kobj->is_visible(boot_kobj->data,
  251. ISCSI_BOOT_INI_FLAGS);
  252. if (attr == &iscsi_boot_attr_ini_isns.attr)
  253. return boot_kobj->is_visible(boot_kobj->data,
  254. ISCSI_BOOT_INI_ISNS_SERVER);
  255. if (attr == &iscsi_boot_attr_ini_slp.attr)
  256. return boot_kobj->is_visible(boot_kobj->data,
  257. ISCSI_BOOT_INI_SLP_SERVER);
  258. if (attr == &iscsi_boot_attr_ini_primary_radius.attr)
  259. return boot_kobj->is_visible(boot_kobj->data,
  260. ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
  261. if (attr == &iscsi_boot_attr_ini_secondary_radius.attr)
  262. return boot_kobj->is_visible(boot_kobj->data,
  263. ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
  264. if (attr == &iscsi_boot_attr_ini_name.attr)
  265. return boot_kobj->is_visible(boot_kobj->data,
  266. ISCSI_BOOT_INI_INITIATOR_NAME);
  267. return 0;
  268. }
  269. static struct attribute_group iscsi_boot_initiator_attr_group = {
  270. .attrs = initiator_attrs,
  271. .is_visible = iscsi_boot_ini_attr_is_visible,
  272. };
  273. /* iBFT ACPI Table attributes */
  274. iscsi_boot_rd_attr(acpitbl_signature, signature, ISCSI_BOOT_ACPITBL_SIGNATURE);
  275. iscsi_boot_rd_attr(acpitbl_oem_id, oem_id, ISCSI_BOOT_ACPITBL_OEM_ID);
  276. iscsi_boot_rd_attr(acpitbl_oem_table_id, oem_table_id,
  277. ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
  278. static struct attribute *acpitbl_attrs[] = {
  279. &iscsi_boot_attr_acpitbl_signature.attr,
  280. &iscsi_boot_attr_acpitbl_oem_id.attr,
  281. &iscsi_boot_attr_acpitbl_oem_table_id.attr,
  282. NULL
  283. };
  284. static umode_t iscsi_boot_acpitbl_attr_is_visible(struct kobject *kobj,
  285. struct attribute *attr, int i)
  286. {
  287. struct iscsi_boot_kobj *boot_kobj =
  288. container_of(kobj, struct iscsi_boot_kobj, kobj);
  289. if (attr == &iscsi_boot_attr_acpitbl_signature.attr)
  290. return boot_kobj->is_visible(boot_kobj->data,
  291. ISCSI_BOOT_ACPITBL_SIGNATURE);
  292. if (attr == &iscsi_boot_attr_acpitbl_oem_id.attr)
  293. return boot_kobj->is_visible(boot_kobj->data,
  294. ISCSI_BOOT_ACPITBL_OEM_ID);
  295. if (attr == &iscsi_boot_attr_acpitbl_oem_table_id.attr)
  296. return boot_kobj->is_visible(boot_kobj->data,
  297. ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
  298. return 0;
  299. }
  300. static struct attribute_group iscsi_boot_acpitbl_attr_group = {
  301. .attrs = acpitbl_attrs,
  302. .is_visible = iscsi_boot_acpitbl_attr_is_visible,
  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. umode_t (*is_visible) (void *data, int type),
  310. void (*release) (void *data))
  311. {
  312. struct iscsi_boot_kobj *boot_kobj;
  313. boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
  314. if (!boot_kobj)
  315. return NULL;
  316. INIT_LIST_HEAD(&boot_kobj->list);
  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. kobject_put(&boot_kobj->kobj);
  321. return NULL;
  322. }
  323. boot_kobj->data = data;
  324. boot_kobj->show = show;
  325. boot_kobj->is_visible = is_visible;
  326. boot_kobj->release = release;
  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->release = NULL;
  335. kobject_put(&boot_kobj->kobj);
  336. return NULL;
  337. }
  338. boot_kobj->attr_group = attr_group;
  339. kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
  340. /* Nothing broke so lets add it to the list. */
  341. list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
  342. return boot_kobj;
  343. }
  344. static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
  345. {
  346. list_del(&boot_kobj->list);
  347. sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
  348. kobject_put(&boot_kobj->kobj);
  349. }
  350. /**
  351. * iscsi_boot_create_target() - create boot target sysfs dir
  352. * @boot_kset: boot kset
  353. * @index: the target id
  354. * @data: driver specific data for target
  355. * @show: attr show function
  356. * @is_visible: attr visibility function
  357. * @release: release function
  358. *
  359. * Note: The boot sysfs lib will free the data passed in for the caller
  360. * when all refs to the target kobject have been released.
  361. */
  362. struct iscsi_boot_kobj *
  363. iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
  364. void *data,
  365. ssize_t (*show) (void *data, int type, char *buf),
  366. umode_t (*is_visible) (void *data, int type),
  367. void (*release) (void *data))
  368. {
  369. return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
  370. "target%d", index, data, show, is_visible,
  371. release);
  372. }
  373. EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
  374. /**
  375. * iscsi_boot_create_initiator() - create boot initiator sysfs dir
  376. * @boot_kset: boot kset
  377. * @index: the initiator id
  378. * @data: driver specific data
  379. * @show: attr show function
  380. * @is_visible: attr visibility function
  381. * @release: release 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. umode_t (*is_visible) (void *data, int type),
  391. void (*release) (void *data))
  392. {
  393. return iscsi_boot_create_kobj(boot_kset,
  394. &iscsi_boot_initiator_attr_group,
  395. "initiator", index, data, show,
  396. is_visible, release);
  397. }
  398. EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
  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. * @release: release function
  407. *
  408. * Note: The boot sysfs lib will free the data passed in for the caller
  409. * when all refs to the ethernet kobject have been released.
  410. */
  411. struct iscsi_boot_kobj *
  412. iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
  413. void *data,
  414. ssize_t (*show) (void *data, int type, char *buf),
  415. umode_t (*is_visible) (void *data, int type),
  416. void (*release) (void *data))
  417. {
  418. return iscsi_boot_create_kobj(boot_kset,
  419. &iscsi_boot_ethernet_attr_group,
  420. "ethernet%d", index, data, show,
  421. is_visible, release);
  422. }
  423. EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
  424. /**
  425. * iscsi_boot_create_acpitbl() - create boot acpi table sysfs dir
  426. * @boot_kset: boot kset
  427. * @index: not used
  428. * @data: driver specific data
  429. * @show: attr show function
  430. * @is_visible: attr visibility function
  431. * @release: release function
  432. *
  433. * Note: The boot sysfs lib will free the data passed in for the caller
  434. * when all refs to the acpitbl kobject have been released.
  435. */
  436. struct iscsi_boot_kobj *
  437. iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index,
  438. void *data,
  439. ssize_t (*show)(void *data, int type, char *buf),
  440. umode_t (*is_visible)(void *data, int type),
  441. void (*release)(void *data))
  442. {
  443. return iscsi_boot_create_kobj(boot_kset,
  444. &iscsi_boot_acpitbl_attr_group,
  445. "acpi_header", index, data, show,
  446. is_visible, release);
  447. }
  448. EXPORT_SYMBOL_GPL(iscsi_boot_create_acpitbl);
  449. /**
  450. * iscsi_boot_create_kset() - creates root sysfs tree
  451. * @set_name: name of root dir
  452. */
  453. struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
  454. {
  455. struct iscsi_boot_kset *boot_kset;
  456. boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
  457. if (!boot_kset)
  458. return NULL;
  459. boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
  460. if (!boot_kset->kset) {
  461. kfree(boot_kset);
  462. return NULL;
  463. }
  464. INIT_LIST_HEAD(&boot_kset->kobj_list);
  465. return boot_kset;
  466. }
  467. EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
  468. /**
  469. * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
  470. * @hostno: host number of scsi host
  471. */
  472. struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
  473. {
  474. struct iscsi_boot_kset *boot_kset;
  475. char *set_name;
  476. set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
  477. if (!set_name)
  478. return NULL;
  479. boot_kset = iscsi_boot_create_kset(set_name);
  480. kfree(set_name);
  481. return boot_kset;
  482. }
  483. EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
  484. /**
  485. * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
  486. * @boot_kset: boot kset
  487. *
  488. * This will remove the kset and kobjects and attrs under it.
  489. */
  490. void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
  491. {
  492. struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
  493. if (!boot_kset)
  494. return;
  495. list_for_each_entry_safe(boot_kobj, tmp_kobj,
  496. &boot_kset->kobj_list, list)
  497. iscsi_boot_remove_kobj(boot_kobj);
  498. kset_unregister(boot_kset->kset);
  499. kfree(boot_kset);
  500. }
  501. EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);