target_core_alua.c 54 KB

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  1. /*******************************************************************************
  2. * Filename: target_core_alua.c
  3. *
  4. * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
  5. *
  6. * (c) Copyright 2009-2012 RisingTide Systems LLC.
  7. *
  8. * Nicholas A. Bellinger <nab@kernel.org>
  9. *
  10. * This program is free software; you can redistribute it and/or modify
  11. * it under the terms of the GNU General Public License as published by
  12. * the Free Software Foundation; either version 2 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with this program; if not, write to the Free Software
  22. * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23. *
  24. ******************************************************************************/
  25. #include <linux/slab.h>
  26. #include <linux/spinlock.h>
  27. #include <linux/configfs.h>
  28. #include <linux/export.h>
  29. #include <linux/file.h>
  30. #include <scsi/scsi.h>
  31. #include <scsi/scsi_cmnd.h>
  32. #include <asm/unaligned.h>
  33. #include <target/target_core_base.h>
  34. #include <target/target_core_backend.h>
  35. #include <target/target_core_fabric.h>
  36. #include <target/target_core_configfs.h>
  37. #include "target_core_internal.h"
  38. #include "target_core_alua.h"
  39. #include "target_core_ua.h"
  40. static sense_reason_t core_alua_check_transition(int state, int *primary);
  41. static int core_alua_set_tg_pt_secondary_state(
  42. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  43. struct se_port *port, int explict, int offline);
  44. static u16 alua_lu_gps_counter;
  45. static u32 alua_lu_gps_count;
  46. static DEFINE_SPINLOCK(lu_gps_lock);
  47. static LIST_HEAD(lu_gps_list);
  48. struct t10_alua_lu_gp *default_lu_gp;
  49. /*
  50. * REPORT_TARGET_PORT_GROUPS
  51. *
  52. * See spc4r17 section 6.27
  53. */
  54. sense_reason_t
  55. target_emulate_report_target_port_groups(struct se_cmd *cmd)
  56. {
  57. struct se_device *dev = cmd->se_dev;
  58. struct se_port *port;
  59. struct t10_alua_tg_pt_gp *tg_pt_gp;
  60. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  61. unsigned char *buf;
  62. u32 rd_len = 0, off;
  63. int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
  64. /*
  65. * Skip over RESERVED area to first Target port group descriptor
  66. * depending on the PARAMETER DATA FORMAT type..
  67. */
  68. if (ext_hdr != 0)
  69. off = 8;
  70. else
  71. off = 4;
  72. if (cmd->data_length < off) {
  73. pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
  74. " small for %s header\n", cmd->data_length,
  75. (ext_hdr) ? "extended" : "normal");
  76. return TCM_INVALID_CDB_FIELD;
  77. }
  78. buf = transport_kmap_data_sg(cmd);
  79. if (!buf)
  80. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  81. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  82. list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
  83. tg_pt_gp_list) {
  84. /*
  85. * Check if the Target port group and Target port descriptor list
  86. * based on tg_pt_gp_members count will fit into the response payload.
  87. * Otherwise, bump rd_len to let the initiator know we have exceeded
  88. * the allocation length and the response is truncated.
  89. */
  90. if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
  91. cmd->data_length) {
  92. rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
  93. continue;
  94. }
  95. /*
  96. * PREF: Preferred target port bit, determine if this
  97. * bit should be set for port group.
  98. */
  99. if (tg_pt_gp->tg_pt_gp_pref)
  100. buf[off] = 0x80;
  101. /*
  102. * Set the ASYMMETRIC ACCESS State
  103. */
  104. buf[off++] |= (atomic_read(
  105. &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
  106. /*
  107. * Set supported ASYMMETRIC ACCESS State bits
  108. */
  109. buf[off] = 0x80; /* T_SUP */
  110. buf[off] |= 0x40; /* O_SUP */
  111. buf[off] |= 0x8; /* U_SUP */
  112. buf[off] |= 0x4; /* S_SUP */
  113. buf[off] |= 0x2; /* AN_SUP */
  114. buf[off++] |= 0x1; /* AO_SUP */
  115. /*
  116. * TARGET PORT GROUP
  117. */
  118. buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
  119. buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
  120. off++; /* Skip over Reserved */
  121. /*
  122. * STATUS CODE
  123. */
  124. buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
  125. /*
  126. * Vendor Specific field
  127. */
  128. buf[off++] = 0x00;
  129. /*
  130. * TARGET PORT COUNT
  131. */
  132. buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
  133. rd_len += 8;
  134. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  135. list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
  136. tg_pt_gp_mem_list) {
  137. port = tg_pt_gp_mem->tg_pt;
  138. /*
  139. * Start Target Port descriptor format
  140. *
  141. * See spc4r17 section 6.2.7 Table 247
  142. */
  143. off += 2; /* Skip over Obsolete */
  144. /*
  145. * Set RELATIVE TARGET PORT IDENTIFIER
  146. */
  147. buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
  148. buf[off++] = (port->sep_rtpi & 0xff);
  149. rd_len += 4;
  150. }
  151. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  152. }
  153. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  154. /*
  155. * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
  156. */
  157. put_unaligned_be32(rd_len, &buf[0]);
  158. /*
  159. * Fill in the Extended header parameter data format if requested
  160. */
  161. if (ext_hdr != 0) {
  162. buf[4] = 0x10;
  163. /*
  164. * Set the implict transition time (in seconds) for the application
  165. * client to use as a base for it's transition timeout value.
  166. *
  167. * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
  168. * this CDB was received upon to determine this value individually
  169. * for ALUA target port group.
  170. */
  171. port = cmd->se_lun->lun_sep;
  172. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  173. if (tg_pt_gp_mem) {
  174. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  175. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  176. if (tg_pt_gp)
  177. buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
  178. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  179. }
  180. }
  181. transport_kunmap_data_sg(cmd);
  182. target_complete_cmd(cmd, GOOD);
  183. return 0;
  184. }
  185. /*
  186. * SET_TARGET_PORT_GROUPS for explict ALUA operation.
  187. *
  188. * See spc4r17 section 6.35
  189. */
  190. sense_reason_t
  191. target_emulate_set_target_port_groups(struct se_cmd *cmd)
  192. {
  193. struct se_device *dev = cmd->se_dev;
  194. struct se_port *port, *l_port = cmd->se_lun->lun_sep;
  195. struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
  196. struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
  197. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
  198. unsigned char *buf;
  199. unsigned char *ptr;
  200. sense_reason_t rc = TCM_NO_SENSE;
  201. u32 len = 4; /* Skip over RESERVED area in header */
  202. int alua_access_state, primary = 0;
  203. u16 tg_pt_id, rtpi;
  204. if (!l_port)
  205. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  206. if (cmd->data_length < 4) {
  207. pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
  208. " small\n", cmd->data_length);
  209. return TCM_INVALID_PARAMETER_LIST;
  210. }
  211. buf = transport_kmap_data_sg(cmd);
  212. if (!buf)
  213. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  214. /*
  215. * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
  216. * for the local tg_pt_gp.
  217. */
  218. l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
  219. if (!l_tg_pt_gp_mem) {
  220. pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
  221. rc = TCM_UNSUPPORTED_SCSI_OPCODE;
  222. goto out;
  223. }
  224. spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
  225. l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
  226. if (!l_tg_pt_gp) {
  227. spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
  228. pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
  229. rc = TCM_UNSUPPORTED_SCSI_OPCODE;
  230. goto out;
  231. }
  232. spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
  233. if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) {
  234. pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
  235. " while TPGS_EXPLICT_ALUA is disabled\n");
  236. rc = TCM_UNSUPPORTED_SCSI_OPCODE;
  237. goto out;
  238. }
  239. ptr = &buf[4]; /* Skip over RESERVED area in header */
  240. while (len < cmd->data_length) {
  241. bool found = false;
  242. alua_access_state = (ptr[0] & 0x0f);
  243. /*
  244. * Check the received ALUA access state, and determine if
  245. * the state is a primary or secondary target port asymmetric
  246. * access state.
  247. */
  248. rc = core_alua_check_transition(alua_access_state, &primary);
  249. if (rc) {
  250. /*
  251. * If the SET TARGET PORT GROUPS attempts to establish
  252. * an invalid combination of target port asymmetric
  253. * access states or attempts to establish an
  254. * unsupported target port asymmetric access state,
  255. * then the command shall be terminated with CHECK
  256. * CONDITION status, with the sense key set to ILLEGAL
  257. * REQUEST, and the additional sense code set to INVALID
  258. * FIELD IN PARAMETER LIST.
  259. */
  260. goto out;
  261. }
  262. /*
  263. * If the ASYMMETRIC ACCESS STATE field (see table 267)
  264. * specifies a primary target port asymmetric access state,
  265. * then the TARGET PORT GROUP OR TARGET PORT field specifies
  266. * a primary target port group for which the primary target
  267. * port asymmetric access state shall be changed. If the
  268. * ASYMMETRIC ACCESS STATE field specifies a secondary target
  269. * port asymmetric access state, then the TARGET PORT GROUP OR
  270. * TARGET PORT field specifies the relative target port
  271. * identifier (see 3.1.120) of the target port for which the
  272. * secondary target port asymmetric access state shall be
  273. * changed.
  274. */
  275. if (primary) {
  276. tg_pt_id = get_unaligned_be16(ptr + 2);
  277. /*
  278. * Locate the matching target port group ID from
  279. * the global tg_pt_gp list
  280. */
  281. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  282. list_for_each_entry(tg_pt_gp,
  283. &dev->t10_alua.tg_pt_gps_list,
  284. tg_pt_gp_list) {
  285. if (!tg_pt_gp->tg_pt_gp_valid_id)
  286. continue;
  287. if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
  288. continue;
  289. atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
  290. smp_mb__after_atomic_inc();
  291. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  292. if (!core_alua_do_port_transition(tg_pt_gp,
  293. dev, l_port, nacl,
  294. alua_access_state, 1))
  295. found = true;
  296. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  297. atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
  298. smp_mb__after_atomic_dec();
  299. break;
  300. }
  301. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  302. } else {
  303. /*
  304. * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
  305. * the Target Port in question for the the incoming
  306. * SET_TARGET_PORT_GROUPS op.
  307. */
  308. rtpi = get_unaligned_be16(ptr + 2);
  309. /*
  310. * Locate the matching relative target port identifier
  311. * for the struct se_device storage object.
  312. */
  313. spin_lock(&dev->se_port_lock);
  314. list_for_each_entry(port, &dev->dev_sep_list,
  315. sep_list) {
  316. if (port->sep_rtpi != rtpi)
  317. continue;
  318. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  319. spin_unlock(&dev->se_port_lock);
  320. if (!core_alua_set_tg_pt_secondary_state(
  321. tg_pt_gp_mem, port, 1, 1))
  322. found = true;
  323. spin_lock(&dev->se_port_lock);
  324. break;
  325. }
  326. spin_unlock(&dev->se_port_lock);
  327. }
  328. if (!found) {
  329. rc = TCM_INVALID_PARAMETER_LIST;
  330. goto out;
  331. }
  332. ptr += 4;
  333. len += 4;
  334. }
  335. out:
  336. transport_kunmap_data_sg(cmd);
  337. if (!rc)
  338. target_complete_cmd(cmd, GOOD);
  339. return rc;
  340. }
  341. static inline int core_alua_state_nonoptimized(
  342. struct se_cmd *cmd,
  343. unsigned char *cdb,
  344. int nonop_delay_msecs,
  345. u8 *alua_ascq)
  346. {
  347. /*
  348. * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
  349. * later to determine if processing of this cmd needs to be
  350. * temporarily delayed for the Active/NonOptimized primary access state.
  351. */
  352. cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
  353. cmd->alua_nonop_delay = nonop_delay_msecs;
  354. return 0;
  355. }
  356. static inline int core_alua_state_standby(
  357. struct se_cmd *cmd,
  358. unsigned char *cdb,
  359. u8 *alua_ascq)
  360. {
  361. /*
  362. * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
  363. * spc4r17 section 5.9.2.4.4
  364. */
  365. switch (cdb[0]) {
  366. case INQUIRY:
  367. case LOG_SELECT:
  368. case LOG_SENSE:
  369. case MODE_SELECT:
  370. case MODE_SENSE:
  371. case REPORT_LUNS:
  372. case RECEIVE_DIAGNOSTIC:
  373. case SEND_DIAGNOSTIC:
  374. return 0;
  375. case MAINTENANCE_IN:
  376. switch (cdb[1] & 0x1f) {
  377. case MI_REPORT_TARGET_PGS:
  378. return 0;
  379. default:
  380. *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
  381. return 1;
  382. }
  383. case MAINTENANCE_OUT:
  384. switch (cdb[1]) {
  385. case MO_SET_TARGET_PGS:
  386. return 0;
  387. default:
  388. *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
  389. return 1;
  390. }
  391. case REQUEST_SENSE:
  392. case PERSISTENT_RESERVE_IN:
  393. case PERSISTENT_RESERVE_OUT:
  394. case READ_BUFFER:
  395. case WRITE_BUFFER:
  396. return 0;
  397. default:
  398. *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
  399. return 1;
  400. }
  401. return 0;
  402. }
  403. static inline int core_alua_state_unavailable(
  404. struct se_cmd *cmd,
  405. unsigned char *cdb,
  406. u8 *alua_ascq)
  407. {
  408. /*
  409. * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
  410. * spc4r17 section 5.9.2.4.5
  411. */
  412. switch (cdb[0]) {
  413. case INQUIRY:
  414. case REPORT_LUNS:
  415. return 0;
  416. case MAINTENANCE_IN:
  417. switch (cdb[1] & 0x1f) {
  418. case MI_REPORT_TARGET_PGS:
  419. return 0;
  420. default:
  421. *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
  422. return 1;
  423. }
  424. case MAINTENANCE_OUT:
  425. switch (cdb[1]) {
  426. case MO_SET_TARGET_PGS:
  427. return 0;
  428. default:
  429. *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
  430. return 1;
  431. }
  432. case REQUEST_SENSE:
  433. case READ_BUFFER:
  434. case WRITE_BUFFER:
  435. return 0;
  436. default:
  437. *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
  438. return 1;
  439. }
  440. return 0;
  441. }
  442. static inline int core_alua_state_transition(
  443. struct se_cmd *cmd,
  444. unsigned char *cdb,
  445. u8 *alua_ascq)
  446. {
  447. /*
  448. * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
  449. * spc4r17 section 5.9.2.5
  450. */
  451. switch (cdb[0]) {
  452. case INQUIRY:
  453. case REPORT_LUNS:
  454. return 0;
  455. case MAINTENANCE_IN:
  456. switch (cdb[1] & 0x1f) {
  457. case MI_REPORT_TARGET_PGS:
  458. return 0;
  459. default:
  460. *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
  461. return 1;
  462. }
  463. case REQUEST_SENSE:
  464. case READ_BUFFER:
  465. case WRITE_BUFFER:
  466. return 0;
  467. default:
  468. *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
  469. return 1;
  470. }
  471. return 0;
  472. }
  473. /*
  474. * return 1: Is used to signal LUN not accecsable, and check condition/not ready
  475. * return 0: Used to signal success
  476. * reutrn -1: Used to signal failure, and invalid cdb field
  477. */
  478. sense_reason_t
  479. target_alua_state_check(struct se_cmd *cmd)
  480. {
  481. struct se_device *dev = cmd->se_dev;
  482. unsigned char *cdb = cmd->t_task_cdb;
  483. struct se_lun *lun = cmd->se_lun;
  484. struct se_port *port = lun->lun_sep;
  485. struct t10_alua_tg_pt_gp *tg_pt_gp;
  486. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  487. int out_alua_state, nonop_delay_msecs;
  488. u8 alua_ascq;
  489. int ret;
  490. if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
  491. return 0;
  492. if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
  493. return 0;
  494. if (!port)
  495. return 0;
  496. /*
  497. * First, check for a struct se_port specific secondary ALUA target port
  498. * access state: OFFLINE
  499. */
  500. if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
  501. pr_debug("ALUA: Got secondary offline status for local"
  502. " target port\n");
  503. alua_ascq = ASCQ_04H_ALUA_OFFLINE;
  504. ret = 1;
  505. goto out;
  506. }
  507. /*
  508. * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
  509. * ALUA target port group, to obtain current ALUA access state.
  510. * Otherwise look for the underlying struct se_device association with
  511. * a ALUA logical unit group.
  512. */
  513. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  514. if (!tg_pt_gp_mem)
  515. return 0;
  516. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  517. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  518. out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
  519. nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
  520. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  521. /*
  522. * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
  523. * statement so the compiler knows explicitly to check this case first.
  524. * For the Optimized ALUA access state case, we want to process the
  525. * incoming fabric cmd ASAP..
  526. */
  527. if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
  528. return 0;
  529. switch (out_alua_state) {
  530. case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
  531. ret = core_alua_state_nonoptimized(cmd, cdb,
  532. nonop_delay_msecs, &alua_ascq);
  533. break;
  534. case ALUA_ACCESS_STATE_STANDBY:
  535. ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
  536. break;
  537. case ALUA_ACCESS_STATE_UNAVAILABLE:
  538. ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
  539. break;
  540. case ALUA_ACCESS_STATE_TRANSITION:
  541. ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
  542. break;
  543. /*
  544. * OFFLINE is a secondary ALUA target port group access state, that is
  545. * handled above with struct se_port->sep_tg_pt_secondary_offline=1
  546. */
  547. case ALUA_ACCESS_STATE_OFFLINE:
  548. default:
  549. pr_err("Unknown ALUA access state: 0x%02x\n",
  550. out_alua_state);
  551. return TCM_INVALID_CDB_FIELD;
  552. }
  553. out:
  554. if (ret > 0) {
  555. /*
  556. * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
  557. * The ALUA additional sense code qualifier (ASCQ) is determined
  558. * by the ALUA primary or secondary access state..
  559. */
  560. pr_debug("[%s]: ALUA TG Port not available, "
  561. "SenseKey: NOT_READY, ASC/ASCQ: "
  562. "0x04/0x%02x\n",
  563. cmd->se_tfo->get_fabric_name(), alua_ascq);
  564. cmd->scsi_asc = 0x04;
  565. cmd->scsi_ascq = alua_ascq;
  566. return TCM_CHECK_CONDITION_NOT_READY;
  567. }
  568. return 0;
  569. }
  570. /*
  571. * Check implict and explict ALUA state change request.
  572. */
  573. static sense_reason_t
  574. core_alua_check_transition(int state, int *primary)
  575. {
  576. switch (state) {
  577. case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
  578. case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
  579. case ALUA_ACCESS_STATE_STANDBY:
  580. case ALUA_ACCESS_STATE_UNAVAILABLE:
  581. /*
  582. * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
  583. * defined as primary target port asymmetric access states.
  584. */
  585. *primary = 1;
  586. break;
  587. case ALUA_ACCESS_STATE_OFFLINE:
  588. /*
  589. * OFFLINE state is defined as a secondary target port
  590. * asymmetric access state.
  591. */
  592. *primary = 0;
  593. break;
  594. default:
  595. pr_err("Unknown ALUA access state: 0x%02x\n", state);
  596. return TCM_INVALID_PARAMETER_LIST;
  597. }
  598. return 0;
  599. }
  600. static char *core_alua_dump_state(int state)
  601. {
  602. switch (state) {
  603. case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
  604. return "Active/Optimized";
  605. case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
  606. return "Active/NonOptimized";
  607. case ALUA_ACCESS_STATE_STANDBY:
  608. return "Standby";
  609. case ALUA_ACCESS_STATE_UNAVAILABLE:
  610. return "Unavailable";
  611. case ALUA_ACCESS_STATE_OFFLINE:
  612. return "Offline";
  613. default:
  614. return "Unknown";
  615. }
  616. return NULL;
  617. }
  618. char *core_alua_dump_status(int status)
  619. {
  620. switch (status) {
  621. case ALUA_STATUS_NONE:
  622. return "None";
  623. case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
  624. return "Altered by Explict STPG";
  625. case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
  626. return "Altered by Implict ALUA";
  627. default:
  628. return "Unknown";
  629. }
  630. return NULL;
  631. }
  632. /*
  633. * Used by fabric modules to determine when we need to delay processing
  634. * for the Active/NonOptimized paths..
  635. */
  636. int core_alua_check_nonop_delay(
  637. struct se_cmd *cmd)
  638. {
  639. if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
  640. return 0;
  641. if (in_interrupt())
  642. return 0;
  643. /*
  644. * The ALUA Active/NonOptimized access state delay can be disabled
  645. * in via configfs with a value of zero
  646. */
  647. if (!cmd->alua_nonop_delay)
  648. return 0;
  649. /*
  650. * struct se_cmd->alua_nonop_delay gets set by a target port group
  651. * defined interval in core_alua_state_nonoptimized()
  652. */
  653. msleep_interruptible(cmd->alua_nonop_delay);
  654. return 0;
  655. }
  656. EXPORT_SYMBOL(core_alua_check_nonop_delay);
  657. /*
  658. * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
  659. *
  660. */
  661. static int core_alua_write_tpg_metadata(
  662. const char *path,
  663. unsigned char *md_buf,
  664. u32 md_buf_len)
  665. {
  666. struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
  667. int ret;
  668. if (IS_ERR(file)) {
  669. pr_err("filp_open(%s) for ALUA metadata failed\n", path);
  670. return -ENODEV;
  671. }
  672. ret = kernel_write(file, md_buf, md_buf_len, 0);
  673. if (ret < 0)
  674. pr_err("Error writing ALUA metadata file: %s\n", path);
  675. fput(file);
  676. return (ret < 0) ? -EIO : 0;
  677. }
  678. /*
  679. * Called with tg_pt_gp->tg_pt_gp_md_mutex held
  680. */
  681. static int core_alua_update_tpg_primary_metadata(
  682. struct t10_alua_tg_pt_gp *tg_pt_gp,
  683. int primary_state,
  684. unsigned char *md_buf)
  685. {
  686. struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
  687. char path[ALUA_METADATA_PATH_LEN];
  688. int len;
  689. memset(path, 0, ALUA_METADATA_PATH_LEN);
  690. len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
  691. "tg_pt_gp_id=%hu\n"
  692. "alua_access_state=0x%02x\n"
  693. "alua_access_status=0x%02x\n",
  694. tg_pt_gp->tg_pt_gp_id, primary_state,
  695. tg_pt_gp->tg_pt_gp_alua_access_status);
  696. snprintf(path, ALUA_METADATA_PATH_LEN,
  697. "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
  698. config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
  699. return core_alua_write_tpg_metadata(path, md_buf, len);
  700. }
  701. static int core_alua_do_transition_tg_pt(
  702. struct t10_alua_tg_pt_gp *tg_pt_gp,
  703. struct se_port *l_port,
  704. struct se_node_acl *nacl,
  705. unsigned char *md_buf,
  706. int new_state,
  707. int explict)
  708. {
  709. struct se_dev_entry *se_deve;
  710. struct se_lun_acl *lacl;
  711. struct se_port *port;
  712. struct t10_alua_tg_pt_gp_member *mem;
  713. int old_state = 0;
  714. /*
  715. * Save the old primary ALUA access state, and set the current state
  716. * to ALUA_ACCESS_STATE_TRANSITION.
  717. */
  718. old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
  719. atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
  720. ALUA_ACCESS_STATE_TRANSITION);
  721. tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
  722. ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
  723. ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
  724. /*
  725. * Check for the optional ALUA primary state transition delay
  726. */
  727. if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
  728. msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
  729. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  730. list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
  731. tg_pt_gp_mem_list) {
  732. port = mem->tg_pt;
  733. /*
  734. * After an implicit target port asymmetric access state
  735. * change, a device server shall establish a unit attention
  736. * condition for the initiator port associated with every I_T
  737. * nexus with the additional sense code set to ASYMMETRIC
  738. * ACCESS STATE CHAGED.
  739. *
  740. * After an explicit target port asymmetric access state
  741. * change, a device server shall establish a unit attention
  742. * condition with the additional sense code set to ASYMMETRIC
  743. * ACCESS STATE CHANGED for the initiator port associated with
  744. * every I_T nexus other than the I_T nexus on which the SET
  745. * TARGET PORT GROUPS command
  746. */
  747. atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
  748. smp_mb__after_atomic_inc();
  749. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  750. spin_lock_bh(&port->sep_alua_lock);
  751. list_for_each_entry(se_deve, &port->sep_alua_list,
  752. alua_port_list) {
  753. lacl = se_deve->se_lun_acl;
  754. /*
  755. * se_deve->se_lun_acl pointer may be NULL for a
  756. * entry created without explict Node+MappedLUN ACLs
  757. */
  758. if (!lacl)
  759. continue;
  760. if (explict &&
  761. (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
  762. (l_port != NULL) && (l_port == port))
  763. continue;
  764. core_scsi3_ua_allocate(lacl->se_lun_nacl,
  765. se_deve->mapped_lun, 0x2A,
  766. ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
  767. }
  768. spin_unlock_bh(&port->sep_alua_lock);
  769. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  770. atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
  771. smp_mb__after_atomic_dec();
  772. }
  773. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  774. /*
  775. * Update the ALUA metadata buf that has been allocated in
  776. * core_alua_do_port_transition(), this metadata will be written
  777. * to struct file.
  778. *
  779. * Note that there is the case where we do not want to update the
  780. * metadata when the saved metadata is being parsed in userspace
  781. * when setting the existing port access state and access status.
  782. *
  783. * Also note that the failure to write out the ALUA metadata to
  784. * struct file does NOT affect the actual ALUA transition.
  785. */
  786. if (tg_pt_gp->tg_pt_gp_write_metadata) {
  787. mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
  788. core_alua_update_tpg_primary_metadata(tg_pt_gp,
  789. new_state, md_buf);
  790. mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
  791. }
  792. /*
  793. * Set the current primary ALUA access state to the requested new state
  794. */
  795. atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
  796. pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
  797. " from primary access state %s to %s\n", (explict) ? "explict" :
  798. "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
  799. tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
  800. core_alua_dump_state(new_state));
  801. return 0;
  802. }
  803. int core_alua_do_port_transition(
  804. struct t10_alua_tg_pt_gp *l_tg_pt_gp,
  805. struct se_device *l_dev,
  806. struct se_port *l_port,
  807. struct se_node_acl *l_nacl,
  808. int new_state,
  809. int explict)
  810. {
  811. struct se_device *dev;
  812. struct se_port *port;
  813. struct se_node_acl *nacl;
  814. struct t10_alua_lu_gp *lu_gp;
  815. struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
  816. struct t10_alua_tg_pt_gp *tg_pt_gp;
  817. unsigned char *md_buf;
  818. int primary;
  819. if (core_alua_check_transition(new_state, &primary) != 0)
  820. return -EINVAL;
  821. md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
  822. if (!md_buf) {
  823. pr_err("Unable to allocate buf for ALUA metadata\n");
  824. return -ENOMEM;
  825. }
  826. local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
  827. spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
  828. lu_gp = local_lu_gp_mem->lu_gp;
  829. atomic_inc(&lu_gp->lu_gp_ref_cnt);
  830. smp_mb__after_atomic_inc();
  831. spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
  832. /*
  833. * For storage objects that are members of the 'default_lu_gp',
  834. * we only do transition on the passed *l_tp_pt_gp, and not
  835. * on all of the matching target port groups IDs in default_lu_gp.
  836. */
  837. if (!lu_gp->lu_gp_id) {
  838. /*
  839. * core_alua_do_transition_tg_pt() will always return
  840. * success.
  841. */
  842. core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
  843. md_buf, new_state, explict);
  844. atomic_dec(&lu_gp->lu_gp_ref_cnt);
  845. smp_mb__after_atomic_dec();
  846. kfree(md_buf);
  847. return 0;
  848. }
  849. /*
  850. * For all other LU groups aside from 'default_lu_gp', walk all of
  851. * the associated storage objects looking for a matching target port
  852. * group ID from the local target port group.
  853. */
  854. spin_lock(&lu_gp->lu_gp_lock);
  855. list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
  856. lu_gp_mem_list) {
  857. dev = lu_gp_mem->lu_gp_mem_dev;
  858. atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
  859. smp_mb__after_atomic_inc();
  860. spin_unlock(&lu_gp->lu_gp_lock);
  861. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  862. list_for_each_entry(tg_pt_gp,
  863. &dev->t10_alua.tg_pt_gps_list,
  864. tg_pt_gp_list) {
  865. if (!tg_pt_gp->tg_pt_gp_valid_id)
  866. continue;
  867. /*
  868. * If the target behavior port asymmetric access state
  869. * is changed for any target port group accessiable via
  870. * a logical unit within a LU group, the target port
  871. * behavior group asymmetric access states for the same
  872. * target port group accessible via other logical units
  873. * in that LU group will also change.
  874. */
  875. if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
  876. continue;
  877. if (l_tg_pt_gp == tg_pt_gp) {
  878. port = l_port;
  879. nacl = l_nacl;
  880. } else {
  881. port = NULL;
  882. nacl = NULL;
  883. }
  884. atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
  885. smp_mb__after_atomic_inc();
  886. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  887. /*
  888. * core_alua_do_transition_tg_pt() will always return
  889. * success.
  890. */
  891. core_alua_do_transition_tg_pt(tg_pt_gp, port,
  892. nacl, md_buf, new_state, explict);
  893. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  894. atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
  895. smp_mb__after_atomic_dec();
  896. }
  897. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  898. spin_lock(&lu_gp->lu_gp_lock);
  899. atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
  900. smp_mb__after_atomic_dec();
  901. }
  902. spin_unlock(&lu_gp->lu_gp_lock);
  903. pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
  904. " Group IDs: %hu %s transition to primary state: %s\n",
  905. config_item_name(&lu_gp->lu_gp_group.cg_item),
  906. l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
  907. core_alua_dump_state(new_state));
  908. atomic_dec(&lu_gp->lu_gp_ref_cnt);
  909. smp_mb__after_atomic_dec();
  910. kfree(md_buf);
  911. return 0;
  912. }
  913. /*
  914. * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
  915. */
  916. static int core_alua_update_tpg_secondary_metadata(
  917. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  918. struct se_port *port,
  919. unsigned char *md_buf,
  920. u32 md_buf_len)
  921. {
  922. struct se_portal_group *se_tpg = port->sep_tpg;
  923. char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
  924. int len;
  925. memset(path, 0, ALUA_METADATA_PATH_LEN);
  926. memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
  927. len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
  928. se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
  929. if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
  930. snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
  931. se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
  932. len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
  933. "alua_tg_pt_status=0x%02x\n",
  934. atomic_read(&port->sep_tg_pt_secondary_offline),
  935. port->sep_tg_pt_secondary_stat);
  936. snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
  937. se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
  938. port->sep_lun->unpacked_lun);
  939. return core_alua_write_tpg_metadata(path, md_buf, len);
  940. }
  941. static int core_alua_set_tg_pt_secondary_state(
  942. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  943. struct se_port *port,
  944. int explict,
  945. int offline)
  946. {
  947. struct t10_alua_tg_pt_gp *tg_pt_gp;
  948. unsigned char *md_buf;
  949. u32 md_buf_len;
  950. int trans_delay_msecs;
  951. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  952. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  953. if (!tg_pt_gp) {
  954. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  955. pr_err("Unable to complete secondary state"
  956. " transition\n");
  957. return -EINVAL;
  958. }
  959. trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
  960. /*
  961. * Set the secondary ALUA target port access state to OFFLINE
  962. * or release the previously secondary state for struct se_port
  963. */
  964. if (offline)
  965. atomic_set(&port->sep_tg_pt_secondary_offline, 1);
  966. else
  967. atomic_set(&port->sep_tg_pt_secondary_offline, 0);
  968. md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
  969. port->sep_tg_pt_secondary_stat = (explict) ?
  970. ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
  971. ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
  972. pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
  973. " to secondary access state: %s\n", (explict) ? "explict" :
  974. "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
  975. tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
  976. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  977. /*
  978. * Do the optional transition delay after we set the secondary
  979. * ALUA access state.
  980. */
  981. if (trans_delay_msecs != 0)
  982. msleep_interruptible(trans_delay_msecs);
  983. /*
  984. * See if we need to update the ALUA fabric port metadata for
  985. * secondary state and status
  986. */
  987. if (port->sep_tg_pt_secondary_write_md) {
  988. md_buf = kzalloc(md_buf_len, GFP_KERNEL);
  989. if (!md_buf) {
  990. pr_err("Unable to allocate md_buf for"
  991. " secondary ALUA access metadata\n");
  992. return -ENOMEM;
  993. }
  994. mutex_lock(&port->sep_tg_pt_md_mutex);
  995. core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
  996. md_buf, md_buf_len);
  997. mutex_unlock(&port->sep_tg_pt_md_mutex);
  998. kfree(md_buf);
  999. }
  1000. return 0;
  1001. }
  1002. struct t10_alua_lu_gp *
  1003. core_alua_allocate_lu_gp(const char *name, int def_group)
  1004. {
  1005. struct t10_alua_lu_gp *lu_gp;
  1006. lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
  1007. if (!lu_gp) {
  1008. pr_err("Unable to allocate struct t10_alua_lu_gp\n");
  1009. return ERR_PTR(-ENOMEM);
  1010. }
  1011. INIT_LIST_HEAD(&lu_gp->lu_gp_node);
  1012. INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
  1013. spin_lock_init(&lu_gp->lu_gp_lock);
  1014. atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
  1015. if (def_group) {
  1016. lu_gp->lu_gp_id = alua_lu_gps_counter++;
  1017. lu_gp->lu_gp_valid_id = 1;
  1018. alua_lu_gps_count++;
  1019. }
  1020. return lu_gp;
  1021. }
  1022. int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
  1023. {
  1024. struct t10_alua_lu_gp *lu_gp_tmp;
  1025. u16 lu_gp_id_tmp;
  1026. /*
  1027. * The lu_gp->lu_gp_id may only be set once..
  1028. */
  1029. if (lu_gp->lu_gp_valid_id) {
  1030. pr_warn("ALUA LU Group already has a valid ID,"
  1031. " ignoring request\n");
  1032. return -EINVAL;
  1033. }
  1034. spin_lock(&lu_gps_lock);
  1035. if (alua_lu_gps_count == 0x0000ffff) {
  1036. pr_err("Maximum ALUA alua_lu_gps_count:"
  1037. " 0x0000ffff reached\n");
  1038. spin_unlock(&lu_gps_lock);
  1039. kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
  1040. return -ENOSPC;
  1041. }
  1042. again:
  1043. lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
  1044. alua_lu_gps_counter++;
  1045. list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
  1046. if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
  1047. if (!lu_gp_id)
  1048. goto again;
  1049. pr_warn("ALUA Logical Unit Group ID: %hu"
  1050. " already exists, ignoring request\n",
  1051. lu_gp_id);
  1052. spin_unlock(&lu_gps_lock);
  1053. return -EINVAL;
  1054. }
  1055. }
  1056. lu_gp->lu_gp_id = lu_gp_id_tmp;
  1057. lu_gp->lu_gp_valid_id = 1;
  1058. list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
  1059. alua_lu_gps_count++;
  1060. spin_unlock(&lu_gps_lock);
  1061. return 0;
  1062. }
  1063. static struct t10_alua_lu_gp_member *
  1064. core_alua_allocate_lu_gp_mem(struct se_device *dev)
  1065. {
  1066. struct t10_alua_lu_gp_member *lu_gp_mem;
  1067. lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
  1068. if (!lu_gp_mem) {
  1069. pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
  1070. return ERR_PTR(-ENOMEM);
  1071. }
  1072. INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
  1073. spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
  1074. atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
  1075. lu_gp_mem->lu_gp_mem_dev = dev;
  1076. dev->dev_alua_lu_gp_mem = lu_gp_mem;
  1077. return lu_gp_mem;
  1078. }
  1079. void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
  1080. {
  1081. struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
  1082. /*
  1083. * Once we have reached this point, config_item_put() has
  1084. * already been called from target_core_alua_drop_lu_gp().
  1085. *
  1086. * Here, we remove the *lu_gp from the global list so that
  1087. * no associations can be made while we are releasing
  1088. * struct t10_alua_lu_gp.
  1089. */
  1090. spin_lock(&lu_gps_lock);
  1091. list_del(&lu_gp->lu_gp_node);
  1092. alua_lu_gps_count--;
  1093. spin_unlock(&lu_gps_lock);
  1094. /*
  1095. * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
  1096. * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
  1097. * released with core_alua_put_lu_gp_from_name()
  1098. */
  1099. while (atomic_read(&lu_gp->lu_gp_ref_cnt))
  1100. cpu_relax();
  1101. /*
  1102. * Release reference to struct t10_alua_lu_gp * from all associated
  1103. * struct se_device.
  1104. */
  1105. spin_lock(&lu_gp->lu_gp_lock);
  1106. list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
  1107. &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
  1108. if (lu_gp_mem->lu_gp_assoc) {
  1109. list_del(&lu_gp_mem->lu_gp_mem_list);
  1110. lu_gp->lu_gp_members--;
  1111. lu_gp_mem->lu_gp_assoc = 0;
  1112. }
  1113. spin_unlock(&lu_gp->lu_gp_lock);
  1114. /*
  1115. *
  1116. * lu_gp_mem is associated with a single
  1117. * struct se_device->dev_alua_lu_gp_mem, and is released when
  1118. * struct se_device is released via core_alua_free_lu_gp_mem().
  1119. *
  1120. * If the passed lu_gp does NOT match the default_lu_gp, assume
  1121. * we want to re-assocate a given lu_gp_mem with default_lu_gp.
  1122. */
  1123. spin_lock(&lu_gp_mem->lu_gp_mem_lock);
  1124. if (lu_gp != default_lu_gp)
  1125. __core_alua_attach_lu_gp_mem(lu_gp_mem,
  1126. default_lu_gp);
  1127. else
  1128. lu_gp_mem->lu_gp = NULL;
  1129. spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
  1130. spin_lock(&lu_gp->lu_gp_lock);
  1131. }
  1132. spin_unlock(&lu_gp->lu_gp_lock);
  1133. kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
  1134. }
  1135. void core_alua_free_lu_gp_mem(struct se_device *dev)
  1136. {
  1137. struct t10_alua_lu_gp *lu_gp;
  1138. struct t10_alua_lu_gp_member *lu_gp_mem;
  1139. lu_gp_mem = dev->dev_alua_lu_gp_mem;
  1140. if (!lu_gp_mem)
  1141. return;
  1142. while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
  1143. cpu_relax();
  1144. spin_lock(&lu_gp_mem->lu_gp_mem_lock);
  1145. lu_gp = lu_gp_mem->lu_gp;
  1146. if (lu_gp) {
  1147. spin_lock(&lu_gp->lu_gp_lock);
  1148. if (lu_gp_mem->lu_gp_assoc) {
  1149. list_del(&lu_gp_mem->lu_gp_mem_list);
  1150. lu_gp->lu_gp_members--;
  1151. lu_gp_mem->lu_gp_assoc = 0;
  1152. }
  1153. spin_unlock(&lu_gp->lu_gp_lock);
  1154. lu_gp_mem->lu_gp = NULL;
  1155. }
  1156. spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
  1157. kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
  1158. }
  1159. struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
  1160. {
  1161. struct t10_alua_lu_gp *lu_gp;
  1162. struct config_item *ci;
  1163. spin_lock(&lu_gps_lock);
  1164. list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
  1165. if (!lu_gp->lu_gp_valid_id)
  1166. continue;
  1167. ci = &lu_gp->lu_gp_group.cg_item;
  1168. if (!strcmp(config_item_name(ci), name)) {
  1169. atomic_inc(&lu_gp->lu_gp_ref_cnt);
  1170. spin_unlock(&lu_gps_lock);
  1171. return lu_gp;
  1172. }
  1173. }
  1174. spin_unlock(&lu_gps_lock);
  1175. return NULL;
  1176. }
  1177. void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
  1178. {
  1179. spin_lock(&lu_gps_lock);
  1180. atomic_dec(&lu_gp->lu_gp_ref_cnt);
  1181. spin_unlock(&lu_gps_lock);
  1182. }
  1183. /*
  1184. * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
  1185. */
  1186. void __core_alua_attach_lu_gp_mem(
  1187. struct t10_alua_lu_gp_member *lu_gp_mem,
  1188. struct t10_alua_lu_gp *lu_gp)
  1189. {
  1190. spin_lock(&lu_gp->lu_gp_lock);
  1191. lu_gp_mem->lu_gp = lu_gp;
  1192. lu_gp_mem->lu_gp_assoc = 1;
  1193. list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
  1194. lu_gp->lu_gp_members++;
  1195. spin_unlock(&lu_gp->lu_gp_lock);
  1196. }
  1197. /*
  1198. * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
  1199. */
  1200. void __core_alua_drop_lu_gp_mem(
  1201. struct t10_alua_lu_gp_member *lu_gp_mem,
  1202. struct t10_alua_lu_gp *lu_gp)
  1203. {
  1204. spin_lock(&lu_gp->lu_gp_lock);
  1205. list_del(&lu_gp_mem->lu_gp_mem_list);
  1206. lu_gp_mem->lu_gp = NULL;
  1207. lu_gp_mem->lu_gp_assoc = 0;
  1208. lu_gp->lu_gp_members--;
  1209. spin_unlock(&lu_gp->lu_gp_lock);
  1210. }
  1211. struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
  1212. const char *name, int def_group)
  1213. {
  1214. struct t10_alua_tg_pt_gp *tg_pt_gp;
  1215. tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
  1216. if (!tg_pt_gp) {
  1217. pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
  1218. return NULL;
  1219. }
  1220. INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
  1221. INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
  1222. mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
  1223. spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
  1224. atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
  1225. tg_pt_gp->tg_pt_gp_dev = dev;
  1226. tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
  1227. atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
  1228. ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
  1229. /*
  1230. * Enable both explict and implict ALUA support by default
  1231. */
  1232. tg_pt_gp->tg_pt_gp_alua_access_type =
  1233. TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
  1234. /*
  1235. * Set the default Active/NonOptimized Delay in milliseconds
  1236. */
  1237. tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
  1238. tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
  1239. tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
  1240. if (def_group) {
  1241. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  1242. tg_pt_gp->tg_pt_gp_id =
  1243. dev->t10_alua.alua_tg_pt_gps_counter++;
  1244. tg_pt_gp->tg_pt_gp_valid_id = 1;
  1245. dev->t10_alua.alua_tg_pt_gps_count++;
  1246. list_add_tail(&tg_pt_gp->tg_pt_gp_list,
  1247. &dev->t10_alua.tg_pt_gps_list);
  1248. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1249. }
  1250. return tg_pt_gp;
  1251. }
  1252. int core_alua_set_tg_pt_gp_id(
  1253. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1254. u16 tg_pt_gp_id)
  1255. {
  1256. struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
  1257. struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
  1258. u16 tg_pt_gp_id_tmp;
  1259. /*
  1260. * The tg_pt_gp->tg_pt_gp_id may only be set once..
  1261. */
  1262. if (tg_pt_gp->tg_pt_gp_valid_id) {
  1263. pr_warn("ALUA TG PT Group already has a valid ID,"
  1264. " ignoring request\n");
  1265. return -EINVAL;
  1266. }
  1267. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  1268. if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
  1269. pr_err("Maximum ALUA alua_tg_pt_gps_count:"
  1270. " 0x0000ffff reached\n");
  1271. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1272. kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
  1273. return -ENOSPC;
  1274. }
  1275. again:
  1276. tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
  1277. dev->t10_alua.alua_tg_pt_gps_counter++;
  1278. list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
  1279. tg_pt_gp_list) {
  1280. if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
  1281. if (!tg_pt_gp_id)
  1282. goto again;
  1283. pr_err("ALUA Target Port Group ID: %hu already"
  1284. " exists, ignoring request\n", tg_pt_gp_id);
  1285. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1286. return -EINVAL;
  1287. }
  1288. }
  1289. tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
  1290. tg_pt_gp->tg_pt_gp_valid_id = 1;
  1291. list_add_tail(&tg_pt_gp->tg_pt_gp_list,
  1292. &dev->t10_alua.tg_pt_gps_list);
  1293. dev->t10_alua.alua_tg_pt_gps_count++;
  1294. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1295. return 0;
  1296. }
  1297. struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
  1298. struct se_port *port)
  1299. {
  1300. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  1301. tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
  1302. GFP_KERNEL);
  1303. if (!tg_pt_gp_mem) {
  1304. pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
  1305. return ERR_PTR(-ENOMEM);
  1306. }
  1307. INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
  1308. spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1309. atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
  1310. tg_pt_gp_mem->tg_pt = port;
  1311. port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
  1312. return tg_pt_gp_mem;
  1313. }
  1314. void core_alua_free_tg_pt_gp(
  1315. struct t10_alua_tg_pt_gp *tg_pt_gp)
  1316. {
  1317. struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
  1318. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
  1319. /*
  1320. * Once we have reached this point, config_item_put() has already
  1321. * been called from target_core_alua_drop_tg_pt_gp().
  1322. *
  1323. * Here we remove *tg_pt_gp from the global list so that
  1324. * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
  1325. * can be made while we are releasing struct t10_alua_tg_pt_gp.
  1326. */
  1327. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  1328. list_del(&tg_pt_gp->tg_pt_gp_list);
  1329. dev->t10_alua.alua_tg_pt_gps_counter--;
  1330. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1331. /*
  1332. * Allow a struct t10_alua_tg_pt_gp_member * referenced by
  1333. * core_alua_get_tg_pt_gp_by_name() in
  1334. * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
  1335. * to be released with core_alua_put_tg_pt_gp_from_name().
  1336. */
  1337. while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
  1338. cpu_relax();
  1339. /*
  1340. * Release reference to struct t10_alua_tg_pt_gp from all associated
  1341. * struct se_port.
  1342. */
  1343. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  1344. list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
  1345. &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
  1346. if (tg_pt_gp_mem->tg_pt_gp_assoc) {
  1347. list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
  1348. tg_pt_gp->tg_pt_gp_members--;
  1349. tg_pt_gp_mem->tg_pt_gp_assoc = 0;
  1350. }
  1351. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  1352. /*
  1353. * tg_pt_gp_mem is associated with a single
  1354. * se_port->sep_alua_tg_pt_gp_mem, and is released via
  1355. * core_alua_free_tg_pt_gp_mem().
  1356. *
  1357. * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
  1358. * assume we want to re-assocate a given tg_pt_gp_mem with
  1359. * default_tg_pt_gp.
  1360. */
  1361. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1362. if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
  1363. __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
  1364. dev->t10_alua.default_tg_pt_gp);
  1365. } else
  1366. tg_pt_gp_mem->tg_pt_gp = NULL;
  1367. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1368. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  1369. }
  1370. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  1371. kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
  1372. }
  1373. void core_alua_free_tg_pt_gp_mem(struct se_port *port)
  1374. {
  1375. struct t10_alua_tg_pt_gp *tg_pt_gp;
  1376. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  1377. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  1378. if (!tg_pt_gp_mem)
  1379. return;
  1380. while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
  1381. cpu_relax();
  1382. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1383. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  1384. if (tg_pt_gp) {
  1385. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  1386. if (tg_pt_gp_mem->tg_pt_gp_assoc) {
  1387. list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
  1388. tg_pt_gp->tg_pt_gp_members--;
  1389. tg_pt_gp_mem->tg_pt_gp_assoc = 0;
  1390. }
  1391. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  1392. tg_pt_gp_mem->tg_pt_gp = NULL;
  1393. }
  1394. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1395. kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
  1396. }
  1397. static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
  1398. struct se_device *dev, const char *name)
  1399. {
  1400. struct t10_alua_tg_pt_gp *tg_pt_gp;
  1401. struct config_item *ci;
  1402. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  1403. list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
  1404. tg_pt_gp_list) {
  1405. if (!tg_pt_gp->tg_pt_gp_valid_id)
  1406. continue;
  1407. ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
  1408. if (!strcmp(config_item_name(ci), name)) {
  1409. atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
  1410. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1411. return tg_pt_gp;
  1412. }
  1413. }
  1414. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1415. return NULL;
  1416. }
  1417. static void core_alua_put_tg_pt_gp_from_name(
  1418. struct t10_alua_tg_pt_gp *tg_pt_gp)
  1419. {
  1420. struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
  1421. spin_lock(&dev->t10_alua.tg_pt_gps_lock);
  1422. atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
  1423. spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
  1424. }
  1425. /*
  1426. * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
  1427. */
  1428. void __core_alua_attach_tg_pt_gp_mem(
  1429. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  1430. struct t10_alua_tg_pt_gp *tg_pt_gp)
  1431. {
  1432. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  1433. tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
  1434. tg_pt_gp_mem->tg_pt_gp_assoc = 1;
  1435. list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
  1436. &tg_pt_gp->tg_pt_gp_mem_list);
  1437. tg_pt_gp->tg_pt_gp_members++;
  1438. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  1439. }
  1440. /*
  1441. * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
  1442. */
  1443. static void __core_alua_drop_tg_pt_gp_mem(
  1444. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
  1445. struct t10_alua_tg_pt_gp *tg_pt_gp)
  1446. {
  1447. spin_lock(&tg_pt_gp->tg_pt_gp_lock);
  1448. list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
  1449. tg_pt_gp_mem->tg_pt_gp = NULL;
  1450. tg_pt_gp_mem->tg_pt_gp_assoc = 0;
  1451. tg_pt_gp->tg_pt_gp_members--;
  1452. spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
  1453. }
  1454. ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
  1455. {
  1456. struct config_item *tg_pt_ci;
  1457. struct t10_alua_tg_pt_gp *tg_pt_gp;
  1458. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  1459. ssize_t len = 0;
  1460. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  1461. if (!tg_pt_gp_mem)
  1462. return len;
  1463. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1464. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  1465. if (tg_pt_gp) {
  1466. tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
  1467. len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
  1468. " %hu\nTG Port Primary Access State: %s\nTG Port "
  1469. "Primary Access Status: %s\nTG Port Secondary Access"
  1470. " State: %s\nTG Port Secondary Access Status: %s\n",
  1471. config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
  1472. core_alua_dump_state(atomic_read(
  1473. &tg_pt_gp->tg_pt_gp_alua_access_state)),
  1474. core_alua_dump_status(
  1475. tg_pt_gp->tg_pt_gp_alua_access_status),
  1476. (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
  1477. "Offline" : "None",
  1478. core_alua_dump_status(port->sep_tg_pt_secondary_stat));
  1479. }
  1480. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1481. return len;
  1482. }
  1483. ssize_t core_alua_store_tg_pt_gp_info(
  1484. struct se_port *port,
  1485. const char *page,
  1486. size_t count)
  1487. {
  1488. struct se_portal_group *tpg;
  1489. struct se_lun *lun;
  1490. struct se_device *dev = port->sep_lun->lun_se_dev;
  1491. struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
  1492. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  1493. unsigned char buf[TG_PT_GROUP_NAME_BUF];
  1494. int move = 0;
  1495. tpg = port->sep_tpg;
  1496. lun = port->sep_lun;
  1497. tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  1498. if (!tg_pt_gp_mem)
  1499. return 0;
  1500. if (count > TG_PT_GROUP_NAME_BUF) {
  1501. pr_err("ALUA Target Port Group alias too large!\n");
  1502. return -EINVAL;
  1503. }
  1504. memset(buf, 0, TG_PT_GROUP_NAME_BUF);
  1505. memcpy(buf, page, count);
  1506. /*
  1507. * Any ALUA target port group alias besides "NULL" means we will be
  1508. * making a new group association.
  1509. */
  1510. if (strcmp(strstrip(buf), "NULL")) {
  1511. /*
  1512. * core_alua_get_tg_pt_gp_by_name() will increment reference to
  1513. * struct t10_alua_tg_pt_gp. This reference is released with
  1514. * core_alua_put_tg_pt_gp_from_name() below.
  1515. */
  1516. tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
  1517. strstrip(buf));
  1518. if (!tg_pt_gp_new)
  1519. return -ENODEV;
  1520. }
  1521. spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1522. tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  1523. if (tg_pt_gp) {
  1524. /*
  1525. * Clearing an existing tg_pt_gp association, and replacing
  1526. * with the default_tg_pt_gp.
  1527. */
  1528. if (!tg_pt_gp_new) {
  1529. pr_debug("Target_Core_ConfigFS: Moving"
  1530. " %s/tpgt_%hu/%s from ALUA Target Port Group:"
  1531. " alua/%s, ID: %hu back to"
  1532. " default_tg_pt_gp\n",
  1533. tpg->se_tpg_tfo->tpg_get_wwn(tpg),
  1534. tpg->se_tpg_tfo->tpg_get_tag(tpg),
  1535. config_item_name(&lun->lun_group.cg_item),
  1536. config_item_name(
  1537. &tg_pt_gp->tg_pt_gp_group.cg_item),
  1538. tg_pt_gp->tg_pt_gp_id);
  1539. __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
  1540. __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
  1541. dev->t10_alua.default_tg_pt_gp);
  1542. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1543. return count;
  1544. }
  1545. /*
  1546. * Removing existing association of tg_pt_gp_mem with tg_pt_gp
  1547. */
  1548. __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
  1549. move = 1;
  1550. }
  1551. /*
  1552. * Associate tg_pt_gp_mem with tg_pt_gp_new.
  1553. */
  1554. __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
  1555. spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  1556. pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
  1557. " Target Port Group: alua/%s, ID: %hu\n", (move) ?
  1558. "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
  1559. tpg->se_tpg_tfo->tpg_get_tag(tpg),
  1560. config_item_name(&lun->lun_group.cg_item),
  1561. config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
  1562. tg_pt_gp_new->tg_pt_gp_id);
  1563. core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
  1564. return count;
  1565. }
  1566. ssize_t core_alua_show_access_type(
  1567. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1568. char *page)
  1569. {
  1570. if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
  1571. (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
  1572. return sprintf(page, "Implict and Explict\n");
  1573. else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
  1574. return sprintf(page, "Implict\n");
  1575. else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
  1576. return sprintf(page, "Explict\n");
  1577. else
  1578. return sprintf(page, "None\n");
  1579. }
  1580. ssize_t core_alua_store_access_type(
  1581. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1582. const char *page,
  1583. size_t count)
  1584. {
  1585. unsigned long tmp;
  1586. int ret;
  1587. ret = kstrtoul(page, 0, &tmp);
  1588. if (ret < 0) {
  1589. pr_err("Unable to extract alua_access_type\n");
  1590. return ret;
  1591. }
  1592. if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
  1593. pr_err("Illegal value for alua_access_type:"
  1594. " %lu\n", tmp);
  1595. return -EINVAL;
  1596. }
  1597. if (tmp == 3)
  1598. tg_pt_gp->tg_pt_gp_alua_access_type =
  1599. TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
  1600. else if (tmp == 2)
  1601. tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
  1602. else if (tmp == 1)
  1603. tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
  1604. else
  1605. tg_pt_gp->tg_pt_gp_alua_access_type = 0;
  1606. return count;
  1607. }
  1608. ssize_t core_alua_show_nonop_delay_msecs(
  1609. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1610. char *page)
  1611. {
  1612. return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
  1613. }
  1614. ssize_t core_alua_store_nonop_delay_msecs(
  1615. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1616. const char *page,
  1617. size_t count)
  1618. {
  1619. unsigned long tmp;
  1620. int ret;
  1621. ret = kstrtoul(page, 0, &tmp);
  1622. if (ret < 0) {
  1623. pr_err("Unable to extract nonop_delay_msecs\n");
  1624. return ret;
  1625. }
  1626. if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
  1627. pr_err("Passed nonop_delay_msecs: %lu, exceeds"
  1628. " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
  1629. ALUA_MAX_NONOP_DELAY_MSECS);
  1630. return -EINVAL;
  1631. }
  1632. tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
  1633. return count;
  1634. }
  1635. ssize_t core_alua_show_trans_delay_msecs(
  1636. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1637. char *page)
  1638. {
  1639. return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
  1640. }
  1641. ssize_t core_alua_store_trans_delay_msecs(
  1642. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1643. const char *page,
  1644. size_t count)
  1645. {
  1646. unsigned long tmp;
  1647. int ret;
  1648. ret = kstrtoul(page, 0, &tmp);
  1649. if (ret < 0) {
  1650. pr_err("Unable to extract trans_delay_msecs\n");
  1651. return ret;
  1652. }
  1653. if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
  1654. pr_err("Passed trans_delay_msecs: %lu, exceeds"
  1655. " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
  1656. ALUA_MAX_TRANS_DELAY_MSECS);
  1657. return -EINVAL;
  1658. }
  1659. tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
  1660. return count;
  1661. }
  1662. ssize_t core_alua_show_implict_trans_secs(
  1663. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1664. char *page)
  1665. {
  1666. return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
  1667. }
  1668. ssize_t core_alua_store_implict_trans_secs(
  1669. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1670. const char *page,
  1671. size_t count)
  1672. {
  1673. unsigned long tmp;
  1674. int ret;
  1675. ret = kstrtoul(page, 0, &tmp);
  1676. if (ret < 0) {
  1677. pr_err("Unable to extract implict_trans_secs\n");
  1678. return ret;
  1679. }
  1680. if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
  1681. pr_err("Passed implict_trans_secs: %lu, exceeds"
  1682. " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
  1683. ALUA_MAX_IMPLICT_TRANS_SECS);
  1684. return -EINVAL;
  1685. }
  1686. tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
  1687. return count;
  1688. }
  1689. ssize_t core_alua_show_preferred_bit(
  1690. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1691. char *page)
  1692. {
  1693. return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
  1694. }
  1695. ssize_t core_alua_store_preferred_bit(
  1696. struct t10_alua_tg_pt_gp *tg_pt_gp,
  1697. const char *page,
  1698. size_t count)
  1699. {
  1700. unsigned long tmp;
  1701. int ret;
  1702. ret = kstrtoul(page, 0, &tmp);
  1703. if (ret < 0) {
  1704. pr_err("Unable to extract preferred ALUA value\n");
  1705. return ret;
  1706. }
  1707. if ((tmp != 0) && (tmp != 1)) {
  1708. pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
  1709. return -EINVAL;
  1710. }
  1711. tg_pt_gp->tg_pt_gp_pref = (int)tmp;
  1712. return count;
  1713. }
  1714. ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
  1715. {
  1716. if (!lun->lun_sep)
  1717. return -ENODEV;
  1718. return sprintf(page, "%d\n",
  1719. atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
  1720. }
  1721. ssize_t core_alua_store_offline_bit(
  1722. struct se_lun *lun,
  1723. const char *page,
  1724. size_t count)
  1725. {
  1726. struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  1727. unsigned long tmp;
  1728. int ret;
  1729. if (!lun->lun_sep)
  1730. return -ENODEV;
  1731. ret = kstrtoul(page, 0, &tmp);
  1732. if (ret < 0) {
  1733. pr_err("Unable to extract alua_tg_pt_offline value\n");
  1734. return ret;
  1735. }
  1736. if ((tmp != 0) && (tmp != 1)) {
  1737. pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
  1738. tmp);
  1739. return -EINVAL;
  1740. }
  1741. tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
  1742. if (!tg_pt_gp_mem) {
  1743. pr_err("Unable to locate *tg_pt_gp_mem\n");
  1744. return -EINVAL;
  1745. }
  1746. ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
  1747. lun->lun_sep, 0, (int)tmp);
  1748. if (ret < 0)
  1749. return -EINVAL;
  1750. return count;
  1751. }
  1752. ssize_t core_alua_show_secondary_status(
  1753. struct se_lun *lun,
  1754. char *page)
  1755. {
  1756. return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
  1757. }
  1758. ssize_t core_alua_store_secondary_status(
  1759. struct se_lun *lun,
  1760. const char *page,
  1761. size_t count)
  1762. {
  1763. unsigned long tmp;
  1764. int ret;
  1765. ret = kstrtoul(page, 0, &tmp);
  1766. if (ret < 0) {
  1767. pr_err("Unable to extract alua_tg_pt_status\n");
  1768. return ret;
  1769. }
  1770. if ((tmp != ALUA_STATUS_NONE) &&
  1771. (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
  1772. (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
  1773. pr_err("Illegal value for alua_tg_pt_status: %lu\n",
  1774. tmp);
  1775. return -EINVAL;
  1776. }
  1777. lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
  1778. return count;
  1779. }
  1780. ssize_t core_alua_show_secondary_write_metadata(
  1781. struct se_lun *lun,
  1782. char *page)
  1783. {
  1784. return sprintf(page, "%d\n",
  1785. lun->lun_sep->sep_tg_pt_secondary_write_md);
  1786. }
  1787. ssize_t core_alua_store_secondary_write_metadata(
  1788. struct se_lun *lun,
  1789. const char *page,
  1790. size_t count)
  1791. {
  1792. unsigned long tmp;
  1793. int ret;
  1794. ret = kstrtoul(page, 0, &tmp);
  1795. if (ret < 0) {
  1796. pr_err("Unable to extract alua_tg_pt_write_md\n");
  1797. return ret;
  1798. }
  1799. if ((tmp != 0) && (tmp != 1)) {
  1800. pr_err("Illegal value for alua_tg_pt_write_md:"
  1801. " %lu\n", tmp);
  1802. return -EINVAL;
  1803. }
  1804. lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
  1805. return count;
  1806. }
  1807. int core_setup_alua(struct se_device *dev)
  1808. {
  1809. if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
  1810. !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
  1811. struct t10_alua_lu_gp_member *lu_gp_mem;
  1812. /*
  1813. * Associate this struct se_device with the default ALUA
  1814. * LUN Group.
  1815. */
  1816. lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
  1817. if (IS_ERR(lu_gp_mem))
  1818. return PTR_ERR(lu_gp_mem);
  1819. spin_lock(&lu_gp_mem->lu_gp_mem_lock);
  1820. __core_alua_attach_lu_gp_mem(lu_gp_mem,
  1821. default_lu_gp);
  1822. spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
  1823. pr_debug("%s: Adding to default ALUA LU Group:"
  1824. " core/alua/lu_gps/default_lu_gp\n",
  1825. dev->transport->name);
  1826. }
  1827. return 0;
  1828. }