1// SPDX-License-Identifier: GPL-2.0-or-later 2/******************************************************************************* 3 * Filename: target_core_alua.c 4 * 5 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13#include <linux/slab.h> 14#include <linux/spinlock.h> 15#include <linux/configfs.h> 16#include <linux/delay.h> 17#include <linux/export.h> 18#include <linux/fcntl.h> 19#include <linux/file.h> 20#include <linux/fs.h> 21#include <scsi/scsi_proto.h> 22#include <asm/unaligned.h> 23 24#include <target/target_core_base.h> 25#include <target/target_core_backend.h> 26#include <target/target_core_fabric.h> 27 28#include "target_core_internal.h" 29#include "target_core_alua.h" 30#include "target_core_ua.h" 31 32static sense_reason_t core_alua_check_transition(int state, int valid, 33 int *primary, int explicit); 34static int core_alua_set_tg_pt_secondary_state( 35 struct se_lun *lun, int explicit, int offline); 36 37static char *core_alua_dump_state(int state); 38 39static void __target_attach_tg_pt_gp(struct se_lun *lun, 40 struct t10_alua_tg_pt_gp *tg_pt_gp); 41 42static u16 alua_lu_gps_counter; 43static u32 alua_lu_gps_count; 44 45static DEFINE_SPINLOCK(lu_gps_lock); 46static LIST_HEAD(lu_gps_list); 47 48struct t10_alua_lu_gp *default_lu_gp; 49 50/* 51 * REPORT REFERRALS 52 * 53 * See sbc3r35 section 5.23 54 */ 55sense_reason_t 56target_emulate_report_referrals(struct se_cmd *cmd) 57{ 58 struct se_device *dev = cmd->se_dev; 59 struct t10_alua_lba_map *map; 60 struct t10_alua_lba_map_member *map_mem; 61 unsigned char *buf; 62 u32 rd_len = 0, off; 63 64 if (cmd->data_length < 4) { 65 pr_warn("REPORT REFERRALS allocation length %u too" 66 " small\n", cmd->data_length); 67 return TCM_INVALID_CDB_FIELD; 68 } 69 70 buf = transport_kmap_data_sg(cmd); 71 if (!buf) 72 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 73 74 off = 4; 75 spin_lock(&dev->t10_alua.lba_map_lock); 76 if (list_empty(&dev->t10_alua.lba_map_list)) { 77 spin_unlock(&dev->t10_alua.lba_map_lock); 78 transport_kunmap_data_sg(cmd); 79 80 return TCM_UNSUPPORTED_SCSI_OPCODE; 81 } 82 83 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 84 lba_map_list) { 85 int desc_num = off + 3; 86 int pg_num; 87 88 off += 4; 89 if (cmd->data_length > off) 90 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 91 off += 8; 92 if (cmd->data_length > off) 93 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 94 off += 8; 95 rd_len += 20; 96 pg_num = 0; 97 list_for_each_entry(map_mem, &map->lba_map_mem_list, 98 lba_map_mem_list) { 99 int alua_state = map_mem->lba_map_mem_alua_state; 100 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 101 102 if (cmd->data_length > off) 103 buf[off] = alua_state & 0x0f; 104 off += 2; 105 if (cmd->data_length > off) 106 buf[off] = (alua_pg_id >> 8) & 0xff; 107 off++; 108 if (cmd->data_length > off) 109 buf[off] = (alua_pg_id & 0xff); 110 off++; 111 rd_len += 4; 112 pg_num++; 113 } 114 if (cmd->data_length > desc_num) 115 buf[desc_num] = pg_num; 116 } 117 spin_unlock(&dev->t10_alua.lba_map_lock); 118 119 /* 120 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 121 */ 122 put_unaligned_be16(rd_len, &buf[2]); 123 124 transport_kunmap_data_sg(cmd); 125 126 target_complete_cmd(cmd, SAM_STAT_GOOD); 127 return 0; 128} 129 130/* 131 * REPORT_TARGET_PORT_GROUPS 132 * 133 * See spc4r17 section 6.27 134 */ 135sense_reason_t 136target_emulate_report_target_port_groups(struct se_cmd *cmd) 137{ 138 struct se_device *dev = cmd->se_dev; 139 struct t10_alua_tg_pt_gp *tg_pt_gp; 140 struct se_lun *lun; 141 unsigned char *buf; 142 u32 rd_len = 0, off; 143 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 144 145 /* 146 * Skip over RESERVED area to first Target port group descriptor 147 * depending on the PARAMETER DATA FORMAT type.. 148 */ 149 if (ext_hdr != 0) 150 off = 8; 151 else 152 off = 4; 153 154 if (cmd->data_length < off) { 155 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 156 " small for %s header\n", cmd->data_length, 157 (ext_hdr) ? "extended" : "normal"); 158 return TCM_INVALID_CDB_FIELD; 159 } 160 buf = transport_kmap_data_sg(cmd); 161 if (!buf) 162 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 163 164 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 165 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 166 tg_pt_gp_list) { 167 /* Skip empty port groups */ 168 if (!tg_pt_gp->tg_pt_gp_members) 169 continue; 170 /* 171 * Check if the Target port group and Target port descriptor list 172 * based on tg_pt_gp_members count will fit into the response payload. 173 * Otherwise, bump rd_len to let the initiator know we have exceeded 174 * the allocation length and the response is truncated. 175 */ 176 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 177 cmd->data_length) { 178 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 179 continue; 180 } 181 /* 182 * PREF: Preferred target port bit, determine if this 183 * bit should be set for port group. 184 */ 185 if (tg_pt_gp->tg_pt_gp_pref) 186 buf[off] = 0x80; 187 /* 188 * Set the ASYMMETRIC ACCESS State 189 */ 190 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff; 191 /* 192 * Set supported ASYMMETRIC ACCESS State bits 193 */ 194 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 195 /* 196 * TARGET PORT GROUP 197 */ 198 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]); 199 off += 2; 200 201 off++; /* Skip over Reserved */ 202 /* 203 * STATUS CODE 204 */ 205 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 206 /* 207 * Vendor Specific field 208 */ 209 buf[off++] = 0x00; 210 /* 211 * TARGET PORT COUNT 212 */ 213 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 214 rd_len += 8; 215 216 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 217 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 218 lun_tg_pt_gp_link) { 219 /* 220 * Start Target Port descriptor format 221 * 222 * See spc4r17 section 6.2.7 Table 247 223 */ 224 off += 2; /* Skip over Obsolete */ 225 /* 226 * Set RELATIVE TARGET PORT IDENTIFIER 227 */ 228 put_unaligned_be16(lun->lun_tpg->tpg_rtpi, &buf[off]); 229 off += 2; 230 rd_len += 4; 231 } 232 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 233 } 234 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 235 /* 236 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 237 */ 238 put_unaligned_be32(rd_len, &buf[0]); 239 240 /* 241 * Fill in the Extended header parameter data format if requested 242 */ 243 if (ext_hdr != 0) { 244 buf[4] = 0x10; 245 /* 246 * Set the implicit transition time (in seconds) for the application 247 * client to use as a base for it's transition timeout value. 248 * 249 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 250 * this CDB was received upon to determine this value individually 251 * for ALUA target port group. 252 */ 253 rcu_read_lock(); 254 tg_pt_gp = rcu_dereference(cmd->se_lun->lun_tg_pt_gp); 255 if (tg_pt_gp) 256 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 257 rcu_read_unlock(); 258 } 259 transport_kunmap_data_sg(cmd); 260 261 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4); 262 return 0; 263} 264 265/* 266 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 267 * 268 * See spc4r17 section 6.35 269 */ 270sense_reason_t 271target_emulate_set_target_port_groups(struct se_cmd *cmd) 272{ 273 struct se_device *dev = cmd->se_dev; 274 struct se_lun *l_lun = cmd->se_lun; 275 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 276 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 277 unsigned char *buf; 278 unsigned char *ptr; 279 sense_reason_t rc = TCM_NO_SENSE; 280 u32 len = 4; /* Skip over RESERVED area in header */ 281 int alua_access_state, primary = 0, valid_states; 282 u16 tg_pt_id, rtpi; 283 284 if (cmd->data_length < 4) { 285 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 286 " small\n", cmd->data_length); 287 return TCM_INVALID_PARAMETER_LIST; 288 } 289 290 buf = transport_kmap_data_sg(cmd); 291 if (!buf) 292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 293 294 /* 295 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 296 * for the local tg_pt_gp. 297 */ 298 rcu_read_lock(); 299 l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp); 300 if (!l_tg_pt_gp) { 301 rcu_read_unlock(); 302 pr_err("Unable to access l_lun->tg_pt_gp\n"); 303 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 304 goto out; 305 } 306 307 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 308 rcu_read_unlock(); 309 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 310 " while TPGS_EXPLICIT_ALUA is disabled\n"); 311 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 312 goto out; 313 } 314 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 315 rcu_read_unlock(); 316 317 ptr = &buf[4]; /* Skip over RESERVED area in header */ 318 319 while (len < cmd->data_length) { 320 bool found = false; 321 alua_access_state = (ptr[0] & 0x0f); 322 /* 323 * Check the received ALUA access state, and determine if 324 * the state is a primary or secondary target port asymmetric 325 * access state. 326 */ 327 rc = core_alua_check_transition(alua_access_state, valid_states, 328 &primary, 1); 329 if (rc) { 330 /* 331 * If the SET TARGET PORT GROUPS attempts to establish 332 * an invalid combination of target port asymmetric 333 * access states or attempts to establish an 334 * unsupported target port asymmetric access state, 335 * then the command shall be terminated with CHECK 336 * CONDITION status, with the sense key set to ILLEGAL 337 * REQUEST, and the additional sense code set to INVALID 338 * FIELD IN PARAMETER LIST. 339 */ 340 goto out; 341 } 342 343 /* 344 * If the ASYMMETRIC ACCESS STATE field (see table 267) 345 * specifies a primary target port asymmetric access state, 346 * then the TARGET PORT GROUP OR TARGET PORT field specifies 347 * a primary target port group for which the primary target 348 * port asymmetric access state shall be changed. If the 349 * ASYMMETRIC ACCESS STATE field specifies a secondary target 350 * port asymmetric access state, then the TARGET PORT GROUP OR 351 * TARGET PORT field specifies the relative target port 352 * identifier (see 3.1.120) of the target port for which the 353 * secondary target port asymmetric access state shall be 354 * changed. 355 */ 356 if (primary) { 357 tg_pt_id = get_unaligned_be16(ptr + 2); 358 /* 359 * Locate the matching target port group ID from 360 * the global tg_pt_gp list 361 */ 362 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 363 list_for_each_entry(tg_pt_gp, 364 &dev->t10_alua.tg_pt_gps_list, 365 tg_pt_gp_list) { 366 if (!tg_pt_gp->tg_pt_gp_valid_id) 367 continue; 368 369 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 370 continue; 371 372 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 373 374 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 375 376 if (!core_alua_do_port_transition(tg_pt_gp, 377 dev, l_lun, nacl, 378 alua_access_state, 1)) 379 found = true; 380 381 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 382 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 383 break; 384 } 385 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 386 } else { 387 struct se_lun *lun; 388 389 /* 390 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 391 * the Target Port in question for the incoming 392 * SET_TARGET_PORT_GROUPS op. 393 */ 394 rtpi = get_unaligned_be16(ptr + 2); 395 /* 396 * Locate the matching relative target port identifier 397 * for the struct se_device storage object. 398 */ 399 spin_lock(&dev->se_port_lock); 400 list_for_each_entry(lun, &dev->dev_sep_list, 401 lun_dev_link) { 402 if (lun->lun_tpg->tpg_rtpi != rtpi) 403 continue; 404 405 // XXX: racy unlock 406 spin_unlock(&dev->se_port_lock); 407 408 if (!core_alua_set_tg_pt_secondary_state( 409 lun, 1, 1)) 410 found = true; 411 412 spin_lock(&dev->se_port_lock); 413 break; 414 } 415 spin_unlock(&dev->se_port_lock); 416 } 417 418 if (!found) { 419 rc = TCM_INVALID_PARAMETER_LIST; 420 goto out; 421 } 422 423 ptr += 4; 424 len += 4; 425 } 426 427out: 428 transport_kunmap_data_sg(cmd); 429 if (!rc) 430 target_complete_cmd(cmd, SAM_STAT_GOOD); 431 return rc; 432} 433 434static inline void core_alua_state_nonoptimized( 435 struct se_cmd *cmd, 436 unsigned char *cdb, 437 int nonop_delay_msecs) 438{ 439 /* 440 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 441 * later to determine if processing of this cmd needs to be 442 * temporarily delayed for the Active/NonOptimized primary access state. 443 */ 444 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 445 cmd->alua_nonop_delay = nonop_delay_msecs; 446} 447 448static inline sense_reason_t core_alua_state_lba_dependent( 449 struct se_cmd *cmd, 450 u16 tg_pt_gp_id) 451{ 452 struct se_device *dev = cmd->se_dev; 453 u64 segment_size, segment_mult, sectors, lba; 454 455 /* Only need to check for cdb actually containing LBAs */ 456 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 457 return 0; 458 459 spin_lock(&dev->t10_alua.lba_map_lock); 460 segment_size = dev->t10_alua.lba_map_segment_size; 461 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 462 sectors = cmd->data_length / dev->dev_attrib.block_size; 463 464 lba = cmd->t_task_lba; 465 while (lba < cmd->t_task_lba + sectors) { 466 struct t10_alua_lba_map *cur_map = NULL, *map; 467 struct t10_alua_lba_map_member *map_mem; 468 469 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 470 lba_map_list) { 471 u64 start_lba, last_lba; 472 u64 first_lba = map->lba_map_first_lba; 473 474 if (segment_mult) { 475 u64 tmp = lba; 476 start_lba = do_div(tmp, segment_size * segment_mult); 477 478 last_lba = first_lba + segment_size - 1; 479 if (start_lba >= first_lba && 480 start_lba <= last_lba) { 481 lba += segment_size; 482 cur_map = map; 483 break; 484 } 485 } else { 486 last_lba = map->lba_map_last_lba; 487 if (lba >= first_lba && lba <= last_lba) { 488 lba = last_lba + 1; 489 cur_map = map; 490 break; 491 } 492 } 493 } 494 if (!cur_map) { 495 spin_unlock(&dev->t10_alua.lba_map_lock); 496 return TCM_ALUA_TG_PT_UNAVAILABLE; 497 } 498 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 499 lba_map_mem_list) { 500 if (map_mem->lba_map_mem_alua_pg_id != tg_pt_gp_id) 501 continue; 502 switch(map_mem->lba_map_mem_alua_state) { 503 case ALUA_ACCESS_STATE_STANDBY: 504 spin_unlock(&dev->t10_alua.lba_map_lock); 505 return TCM_ALUA_TG_PT_STANDBY; 506 case ALUA_ACCESS_STATE_UNAVAILABLE: 507 spin_unlock(&dev->t10_alua.lba_map_lock); 508 return TCM_ALUA_TG_PT_UNAVAILABLE; 509 default: 510 break; 511 } 512 } 513 } 514 spin_unlock(&dev->t10_alua.lba_map_lock); 515 return 0; 516} 517 518static inline sense_reason_t core_alua_state_standby( 519 struct se_cmd *cmd, 520 unsigned char *cdb) 521{ 522 /* 523 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 524 * spc4r17 section 5.9.2.4.4 525 */ 526 switch (cdb[0]) { 527 case INQUIRY: 528 case LOG_SELECT: 529 case LOG_SENSE: 530 case MODE_SELECT: 531 case MODE_SENSE: 532 case REPORT_LUNS: 533 case RECEIVE_DIAGNOSTIC: 534 case SEND_DIAGNOSTIC: 535 case READ_CAPACITY: 536 return 0; 537 case SERVICE_ACTION_IN_16: 538 switch (cdb[1] & 0x1f) { 539 case SAI_READ_CAPACITY_16: 540 return 0; 541 default: 542 return TCM_ALUA_TG_PT_STANDBY; 543 } 544 case MAINTENANCE_IN: 545 switch (cdb[1] & 0x1f) { 546 case MI_REPORT_TARGET_PGS: 547 return 0; 548 default: 549 return TCM_ALUA_TG_PT_STANDBY; 550 } 551 case MAINTENANCE_OUT: 552 switch (cdb[1]) { 553 case MO_SET_TARGET_PGS: 554 return 0; 555 default: 556 return TCM_ALUA_TG_PT_STANDBY; 557 } 558 case REQUEST_SENSE: 559 case PERSISTENT_RESERVE_IN: 560 case PERSISTENT_RESERVE_OUT: 561 case READ_BUFFER: 562 case WRITE_BUFFER: 563 return 0; 564 default: 565 return TCM_ALUA_TG_PT_STANDBY; 566 } 567 568 return 0; 569} 570 571static inline sense_reason_t core_alua_state_unavailable( 572 struct se_cmd *cmd, 573 unsigned char *cdb) 574{ 575 /* 576 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 577 * spc4r17 section 5.9.2.4.5 578 */ 579 switch (cdb[0]) { 580 case INQUIRY: 581 case REPORT_LUNS: 582 return 0; 583 case MAINTENANCE_IN: 584 switch (cdb[1] & 0x1f) { 585 case MI_REPORT_TARGET_PGS: 586 return 0; 587 default: 588 return TCM_ALUA_TG_PT_UNAVAILABLE; 589 } 590 case MAINTENANCE_OUT: 591 switch (cdb[1]) { 592 case MO_SET_TARGET_PGS: 593 return 0; 594 default: 595 return TCM_ALUA_TG_PT_UNAVAILABLE; 596 } 597 case REQUEST_SENSE: 598 case READ_BUFFER: 599 case WRITE_BUFFER: 600 return 0; 601 default: 602 return TCM_ALUA_TG_PT_UNAVAILABLE; 603 } 604 605 return 0; 606} 607 608static inline sense_reason_t core_alua_state_transition( 609 struct se_cmd *cmd, 610 unsigned char *cdb) 611{ 612 /* 613 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 614 * spc4r17 section 5.9.2.5 615 */ 616 switch (cdb[0]) { 617 case INQUIRY: 618 case REPORT_LUNS: 619 return 0; 620 case MAINTENANCE_IN: 621 switch (cdb[1] & 0x1f) { 622 case MI_REPORT_TARGET_PGS: 623 return 0; 624 default: 625 return TCM_ALUA_STATE_TRANSITION; 626 } 627 case REQUEST_SENSE: 628 case READ_BUFFER: 629 case WRITE_BUFFER: 630 return 0; 631 default: 632 return TCM_ALUA_STATE_TRANSITION; 633 } 634 635 return 0; 636} 637 638/* 639 * return 1: Is used to signal LUN not accessible, and check condition/not ready 640 * return 0: Used to signal success 641 * return -1: Used to signal failure, and invalid cdb field 642 */ 643sense_reason_t 644target_alua_state_check(struct se_cmd *cmd) 645{ 646 struct se_device *dev = cmd->se_dev; 647 unsigned char *cdb = cmd->t_task_cdb; 648 struct se_lun *lun = cmd->se_lun; 649 struct t10_alua_tg_pt_gp *tg_pt_gp; 650 int out_alua_state, nonop_delay_msecs; 651 u16 tg_pt_gp_id; 652 sense_reason_t rc = TCM_NO_SENSE; 653 654 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 655 return 0; 656 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 657 return 0; 658 659 /* 660 * First, check for a struct se_port specific secondary ALUA target port 661 * access state: OFFLINE 662 */ 663 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) { 664 pr_debug("ALUA: Got secondary offline status for local" 665 " target port\n"); 666 return TCM_ALUA_OFFLINE; 667 } 668 rcu_read_lock(); 669 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 670 if (!tg_pt_gp) { 671 rcu_read_unlock(); 672 return 0; 673 } 674 675 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state; 676 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 677 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 678 rcu_read_unlock(); 679 /* 680 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 681 * statement so the compiler knows explicitly to check this case first. 682 * For the Optimized ALUA access state case, we want to process the 683 * incoming fabric cmd ASAP.. 684 */ 685 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 686 return 0; 687 688 switch (out_alua_state) { 689 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 690 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 691 break; 692 case ALUA_ACCESS_STATE_STANDBY: 693 rc = core_alua_state_standby(cmd, cdb); 694 break; 695 case ALUA_ACCESS_STATE_UNAVAILABLE: 696 rc = core_alua_state_unavailable(cmd, cdb); 697 break; 698 case ALUA_ACCESS_STATE_TRANSITION: 699 rc = core_alua_state_transition(cmd, cdb); 700 break; 701 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 702 rc = core_alua_state_lba_dependent(cmd, tg_pt_gp_id); 703 break; 704 /* 705 * OFFLINE is a secondary ALUA target port group access state, that is 706 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1 707 */ 708 case ALUA_ACCESS_STATE_OFFLINE: 709 default: 710 pr_err("Unknown ALUA access state: 0x%02x\n", 711 out_alua_state); 712 rc = TCM_INVALID_CDB_FIELD; 713 } 714 715 if (rc && rc != TCM_INVALID_CDB_FIELD) { 716 pr_debug("[%s]: ALUA TG Port not available, " 717 "SenseKey: NOT_READY, ASC/rc: 0x04/%d\n", 718 cmd->se_tfo->fabric_name, rc); 719 } 720 721 return rc; 722} 723 724/* 725 * Check implicit and explicit ALUA state change request. 726 */ 727static sense_reason_t 728core_alua_check_transition(int state, int valid, int *primary, int explicit) 729{ 730 /* 731 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 732 * defined as primary target port asymmetric access states. 733 */ 734 switch (state) { 735 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 736 if (!(valid & ALUA_AO_SUP)) 737 goto not_supported; 738 *primary = 1; 739 break; 740 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 741 if (!(valid & ALUA_AN_SUP)) 742 goto not_supported; 743 *primary = 1; 744 break; 745 case ALUA_ACCESS_STATE_STANDBY: 746 if (!(valid & ALUA_S_SUP)) 747 goto not_supported; 748 *primary = 1; 749 break; 750 case ALUA_ACCESS_STATE_UNAVAILABLE: 751 if (!(valid & ALUA_U_SUP)) 752 goto not_supported; 753 *primary = 1; 754 break; 755 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 756 if (!(valid & ALUA_LBD_SUP)) 757 goto not_supported; 758 *primary = 1; 759 break; 760 case ALUA_ACCESS_STATE_OFFLINE: 761 /* 762 * OFFLINE state is defined as a secondary target port 763 * asymmetric access state. 764 */ 765 if (!(valid & ALUA_O_SUP)) 766 goto not_supported; 767 *primary = 0; 768 break; 769 case ALUA_ACCESS_STATE_TRANSITION: 770 if (!(valid & ALUA_T_SUP) || explicit) 771 /* 772 * Transitioning is set internally and by tcmu daemon, 773 * and cannot be selected through a STPG. 774 */ 775 goto not_supported; 776 *primary = 0; 777 break; 778 default: 779 pr_err("Unknown ALUA access state: 0x%02x\n", state); 780 return TCM_INVALID_PARAMETER_LIST; 781 } 782 783 return 0; 784 785not_supported: 786 pr_err("ALUA access state %s not supported", 787 core_alua_dump_state(state)); 788 return TCM_INVALID_PARAMETER_LIST; 789} 790 791static char *core_alua_dump_state(int state) 792{ 793 switch (state) { 794 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 795 return "Active/Optimized"; 796 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 797 return "Active/NonOptimized"; 798 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 799 return "LBA Dependent"; 800 case ALUA_ACCESS_STATE_STANDBY: 801 return "Standby"; 802 case ALUA_ACCESS_STATE_UNAVAILABLE: 803 return "Unavailable"; 804 case ALUA_ACCESS_STATE_OFFLINE: 805 return "Offline"; 806 case ALUA_ACCESS_STATE_TRANSITION: 807 return "Transitioning"; 808 default: 809 return "Unknown"; 810 } 811 812 return NULL; 813} 814 815char *core_alua_dump_status(int status) 816{ 817 switch (status) { 818 case ALUA_STATUS_NONE: 819 return "None"; 820 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 821 return "Altered by Explicit STPG"; 822 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 823 return "Altered by Implicit ALUA"; 824 default: 825 return "Unknown"; 826 } 827 828 return NULL; 829} 830 831/* 832 * Used by fabric modules to determine when we need to delay processing 833 * for the Active/NonOptimized paths.. 834 */ 835int core_alua_check_nonop_delay( 836 struct se_cmd *cmd) 837{ 838 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 839 return 0; 840 /* 841 * The ALUA Active/NonOptimized access state delay can be disabled 842 * in via configfs with a value of zero 843 */ 844 if (!cmd->alua_nonop_delay) 845 return 0; 846 /* 847 * struct se_cmd->alua_nonop_delay gets set by a target port group 848 * defined interval in core_alua_state_nonoptimized() 849 */ 850 msleep_interruptible(cmd->alua_nonop_delay); 851 return 0; 852} 853 854static int core_alua_write_tpg_metadata( 855 const char *path, 856 unsigned char *md_buf, 857 u32 md_buf_len) 858{ 859 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 860 loff_t pos = 0; 861 int ret; 862 863 if (IS_ERR(file)) { 864 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 865 return -ENODEV; 866 } 867 ret = kernel_write(file, md_buf, md_buf_len, &pos); 868 if (ret < 0) 869 pr_err("Error writing ALUA metadata file: %s\n", path); 870 fput(file); 871 return (ret < 0) ? -EIO : 0; 872} 873 874static int core_alua_update_tpg_primary_metadata( 875 struct t10_alua_tg_pt_gp *tg_pt_gp) 876{ 877 unsigned char *md_buf; 878 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 879 char *path; 880 int len, rc; 881 882 lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex); 883 884 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 885 if (!md_buf) { 886 pr_err("Unable to allocate buf for ALUA metadata\n"); 887 return -ENOMEM; 888 } 889 890 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 891 "tg_pt_gp_id=%hu\n" 892 "alua_access_state=0x%02x\n" 893 "alua_access_status=0x%02x\n", 894 tg_pt_gp->tg_pt_gp_id, 895 tg_pt_gp->tg_pt_gp_alua_access_state, 896 tg_pt_gp->tg_pt_gp_alua_access_status); 897 898 rc = -ENOMEM; 899 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root, 900 &wwn->unit_serial[0], 901 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 902 if (path) { 903 rc = core_alua_write_tpg_metadata(path, md_buf, len); 904 kfree(path); 905 } 906 kfree(md_buf); 907 return rc; 908} 909 910static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) 911{ 912 struct se_dev_entry *se_deve; 913 struct se_lun *lun; 914 struct se_lun_acl *lacl; 915 916 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 917 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 918 lun_tg_pt_gp_link) { 919 /* 920 * After an implicit target port asymmetric access state 921 * change, a device server shall establish a unit attention 922 * condition for the initiator port associated with every I_T 923 * nexus with the additional sense code set to ASYMMETRIC 924 * ACCESS STATE CHANGED. 925 * 926 * After an explicit target port asymmetric access state 927 * change, a device server shall establish a unit attention 928 * condition with the additional sense code set to ASYMMETRIC 929 * ACCESS STATE CHANGED for the initiator port associated with 930 * every I_T nexus other than the I_T nexus on which the SET 931 * TARGET PORT GROUPS command 932 */ 933 if (!percpu_ref_tryget_live(&lun->lun_ref)) 934 continue; 935 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 936 937 spin_lock(&lun->lun_deve_lock); 938 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { 939 lacl = se_deve->se_lun_acl; 940 941 /* 942 * spc4r37 p.242: 943 * After an explicit target port asymmetric access 944 * state change, a device server shall establish a 945 * unit attention condition with the additional sense 946 * code set to ASYMMETRIC ACCESS STATE CHANGED for 947 * the initiator port associated with every I_T nexus 948 * other than the I_T nexus on which the SET TARGET 949 * PORT GROUPS command was received. 950 */ 951 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 952 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 953 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && 954 (tg_pt_gp->tg_pt_gp_alua_lun == lun)) 955 continue; 956 957 /* 958 * se_deve->se_lun_acl pointer may be NULL for a 959 * entry created without explicit Node+MappedLUN ACLs 960 */ 961 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 962 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) 963 continue; 964 965 core_scsi3_ua_allocate(se_deve, 0x2A, 966 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 967 } 968 spin_unlock(&lun->lun_deve_lock); 969 970 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 971 percpu_ref_put(&lun->lun_ref); 972 } 973 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 974} 975 976static int core_alua_do_transition_tg_pt( 977 struct t10_alua_tg_pt_gp *tg_pt_gp, 978 int new_state, 979 int explicit) 980{ 981 int prev_state; 982 983 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex); 984 /* Nothing to be done here */ 985 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) { 986 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 987 return 0; 988 } 989 990 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) { 991 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 992 return -EAGAIN; 993 } 994 995 /* 996 * Save the old primary ALUA access state, and set the current state 997 * to ALUA_ACCESS_STATE_TRANSITION. 998 */ 999 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state; 1000 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION; 1001 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1002 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1003 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1004 1005 core_alua_queue_state_change_ua(tg_pt_gp); 1006 1007 if (new_state == ALUA_ACCESS_STATE_TRANSITION) { 1008 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 1009 return 0; 1010 } 1011 1012 /* 1013 * Check for the optional ALUA primary state transition delay 1014 */ 1015 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1016 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1017 1018 /* 1019 * Set the current primary ALUA access state to the requested new state 1020 */ 1021 tg_pt_gp->tg_pt_gp_alua_access_state = new_state; 1022 1023 /* 1024 * Update the ALUA metadata buf that has been allocated in 1025 * core_alua_do_port_transition(), this metadata will be written 1026 * to struct file. 1027 * 1028 * Note that there is the case where we do not want to update the 1029 * metadata when the saved metadata is being parsed in userspace 1030 * when setting the existing port access state and access status. 1031 * 1032 * Also note that the failure to write out the ALUA metadata to 1033 * struct file does NOT affect the actual ALUA transition. 1034 */ 1035 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1036 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1037 } 1038 1039 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1040 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1041 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1042 tg_pt_gp->tg_pt_gp_id, 1043 core_alua_dump_state(prev_state), 1044 core_alua_dump_state(new_state)); 1045 1046 core_alua_queue_state_change_ua(tg_pt_gp); 1047 1048 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 1049 return 0; 1050} 1051 1052int core_alua_do_port_transition( 1053 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1054 struct se_device *l_dev, 1055 struct se_lun *l_lun, 1056 struct se_node_acl *l_nacl, 1057 int new_state, 1058 int explicit) 1059{ 1060 struct se_device *dev; 1061 struct t10_alua_lu_gp *lu_gp; 1062 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1063 struct t10_alua_tg_pt_gp *tg_pt_gp; 1064 int primary, valid_states, rc = 0; 1065 1066 if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 1067 return -ENODEV; 1068 1069 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1070 if (core_alua_check_transition(new_state, valid_states, &primary, 1071 explicit) != 0) 1072 return -EINVAL; 1073 1074 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1075 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1076 lu_gp = local_lu_gp_mem->lu_gp; 1077 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1078 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1079 /* 1080 * For storage objects that are members of the 'default_lu_gp', 1081 * we only do transition on the passed *l_tp_pt_gp, and not 1082 * on all of the matching target port groups IDs in default_lu_gp. 1083 */ 1084 if (!lu_gp->lu_gp_id) { 1085 /* 1086 * core_alua_do_transition_tg_pt() will always return 1087 * success. 1088 */ 1089 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1090 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1091 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1092 new_state, explicit); 1093 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1094 return rc; 1095 } 1096 /* 1097 * For all other LU groups aside from 'default_lu_gp', walk all of 1098 * the associated storage objects looking for a matching target port 1099 * group ID from the local target port group. 1100 */ 1101 spin_lock(&lu_gp->lu_gp_lock); 1102 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1103 lu_gp_mem_list) { 1104 1105 dev = lu_gp_mem->lu_gp_mem_dev; 1106 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1107 spin_unlock(&lu_gp->lu_gp_lock); 1108 1109 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1110 list_for_each_entry(tg_pt_gp, 1111 &dev->t10_alua.tg_pt_gps_list, 1112 tg_pt_gp_list) { 1113 1114 if (!tg_pt_gp->tg_pt_gp_valid_id) 1115 continue; 1116 /* 1117 * If the target behavior port asymmetric access state 1118 * is changed for any target port group accessible via 1119 * a logical unit within a LU group, the target port 1120 * behavior group asymmetric access states for the same 1121 * target port group accessible via other logical units 1122 * in that LU group will also change. 1123 */ 1124 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1125 continue; 1126 1127 if (l_tg_pt_gp == tg_pt_gp) { 1128 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1129 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1130 } else { 1131 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1132 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1133 } 1134 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1135 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1136 /* 1137 * core_alua_do_transition_tg_pt() will always return 1138 * success. 1139 */ 1140 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1141 new_state, explicit); 1142 1143 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1144 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1145 if (rc) 1146 break; 1147 } 1148 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1149 1150 spin_lock(&lu_gp->lu_gp_lock); 1151 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1152 } 1153 spin_unlock(&lu_gp->lu_gp_lock); 1154 1155 if (!rc) { 1156 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1157 " Group IDs: %hu %s transition to primary state: %s\n", 1158 config_item_name(&lu_gp->lu_gp_group.cg_item), 1159 l_tg_pt_gp->tg_pt_gp_id, 1160 (explicit) ? "explicit" : "implicit", 1161 core_alua_dump_state(new_state)); 1162 } 1163 1164 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1165 return rc; 1166} 1167 1168static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1169{ 1170 struct se_portal_group *se_tpg = lun->lun_tpg; 1171 unsigned char *md_buf; 1172 char *path; 1173 int len, rc; 1174 1175 mutex_lock(&lun->lun_tg_pt_md_mutex); 1176 1177 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1178 if (!md_buf) { 1179 pr_err("Unable to allocate buf for ALUA metadata\n"); 1180 rc = -ENOMEM; 1181 goto out_unlock; 1182 } 1183 1184 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1185 "alua_tg_pt_status=0x%02x\n", 1186 atomic_read(&lun->lun_tg_pt_secondary_offline), 1187 lun->lun_tg_pt_secondary_stat); 1188 1189 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) { 1190 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu", 1191 db_root, se_tpg->se_tpg_tfo->fabric_name, 1192 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), 1193 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg), 1194 lun->unpacked_lun); 1195 } else { 1196 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu", 1197 db_root, se_tpg->se_tpg_tfo->fabric_name, 1198 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), 1199 lun->unpacked_lun); 1200 } 1201 if (!path) { 1202 rc = -ENOMEM; 1203 goto out_free; 1204 } 1205 1206 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1207 kfree(path); 1208out_free: 1209 kfree(md_buf); 1210out_unlock: 1211 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1212 return rc; 1213} 1214 1215static int core_alua_set_tg_pt_secondary_state( 1216 struct se_lun *lun, 1217 int explicit, 1218 int offline) 1219{ 1220 struct t10_alua_tg_pt_gp *tg_pt_gp; 1221 int trans_delay_msecs; 1222 1223 rcu_read_lock(); 1224 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 1225 if (!tg_pt_gp) { 1226 rcu_read_unlock(); 1227 pr_err("Unable to complete secondary state" 1228 " transition\n"); 1229 return -EINVAL; 1230 } 1231 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1232 /* 1233 * Set the secondary ALUA target port access state to OFFLINE 1234 * or release the previously secondary state for struct se_lun 1235 */ 1236 if (offline) 1237 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1238 else 1239 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1240 1241 lun->lun_tg_pt_secondary_stat = (explicit) ? 1242 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1243 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1244 1245 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1246 " to secondary access state: %s\n", (explicit) ? "explicit" : 1247 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1248 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1249 1250 rcu_read_unlock(); 1251 /* 1252 * Do the optional transition delay after we set the secondary 1253 * ALUA access state. 1254 */ 1255 if (trans_delay_msecs != 0) 1256 msleep_interruptible(trans_delay_msecs); 1257 /* 1258 * See if we need to update the ALUA fabric port metadata for 1259 * secondary state and status 1260 */ 1261 if (lun->lun_tg_pt_secondary_write_md) 1262 core_alua_update_tpg_secondary_metadata(lun); 1263 1264 return 0; 1265} 1266 1267struct t10_alua_lba_map * 1268core_alua_allocate_lba_map(struct list_head *list, 1269 u64 first_lba, u64 last_lba) 1270{ 1271 struct t10_alua_lba_map *lba_map; 1272 1273 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1274 if (!lba_map) { 1275 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1276 return ERR_PTR(-ENOMEM); 1277 } 1278 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1279 lba_map->lba_map_first_lba = first_lba; 1280 lba_map->lba_map_last_lba = last_lba; 1281 1282 list_add_tail(&lba_map->lba_map_list, list); 1283 return lba_map; 1284} 1285 1286int 1287core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1288 int pg_id, int state) 1289{ 1290 struct t10_alua_lba_map_member *lba_map_mem; 1291 1292 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1293 lba_map_mem_list) { 1294 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1295 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1296 return -EINVAL; 1297 } 1298 } 1299 1300 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1301 if (!lba_map_mem) { 1302 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1303 return -ENOMEM; 1304 } 1305 lba_map_mem->lba_map_mem_alua_state = state; 1306 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1307 1308 list_add_tail(&lba_map_mem->lba_map_mem_list, 1309 &lba_map->lba_map_mem_list); 1310 return 0; 1311} 1312 1313void 1314core_alua_free_lba_map(struct list_head *lba_list) 1315{ 1316 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1317 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1318 1319 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1320 lba_map_list) { 1321 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1322 &lba_map->lba_map_mem_list, 1323 lba_map_mem_list) { 1324 list_del(&lba_map_mem->lba_map_mem_list); 1325 kmem_cache_free(t10_alua_lba_map_mem_cache, 1326 lba_map_mem); 1327 } 1328 list_del(&lba_map->lba_map_list); 1329 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1330 } 1331} 1332 1333void 1334core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1335 int segment_size, int segment_mult) 1336{ 1337 struct list_head old_lba_map_list; 1338 struct t10_alua_tg_pt_gp *tg_pt_gp; 1339 int activate = 0, supported; 1340 1341 INIT_LIST_HEAD(&old_lba_map_list); 1342 spin_lock(&dev->t10_alua.lba_map_lock); 1343 dev->t10_alua.lba_map_segment_size = segment_size; 1344 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1345 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1346 if (lba_map_list) { 1347 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1348 activate = 1; 1349 } 1350 spin_unlock(&dev->t10_alua.lba_map_lock); 1351 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1352 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1353 tg_pt_gp_list) { 1354 1355 if (!tg_pt_gp->tg_pt_gp_valid_id) 1356 continue; 1357 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1358 if (activate) 1359 supported |= ALUA_LBD_SUP; 1360 else 1361 supported &= ~ALUA_LBD_SUP; 1362 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1363 } 1364 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1365 core_alua_free_lba_map(&old_lba_map_list); 1366} 1367 1368struct t10_alua_lu_gp * 1369core_alua_allocate_lu_gp(const char *name, int def_group) 1370{ 1371 struct t10_alua_lu_gp *lu_gp; 1372 1373 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1374 if (!lu_gp) { 1375 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1376 return ERR_PTR(-ENOMEM); 1377 } 1378 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1379 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1380 spin_lock_init(&lu_gp->lu_gp_lock); 1381 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1382 1383 if (def_group) { 1384 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1385 lu_gp->lu_gp_valid_id = 1; 1386 alua_lu_gps_count++; 1387 } 1388 1389 return lu_gp; 1390} 1391 1392int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1393{ 1394 struct t10_alua_lu_gp *lu_gp_tmp; 1395 u16 lu_gp_id_tmp; 1396 /* 1397 * The lu_gp->lu_gp_id may only be set once.. 1398 */ 1399 if (lu_gp->lu_gp_valid_id) { 1400 pr_warn("ALUA LU Group already has a valid ID," 1401 " ignoring request\n"); 1402 return -EINVAL; 1403 } 1404 1405 spin_lock(&lu_gps_lock); 1406 if (alua_lu_gps_count == 0x0000ffff) { 1407 pr_err("Maximum ALUA alua_lu_gps_count:" 1408 " 0x0000ffff reached\n"); 1409 spin_unlock(&lu_gps_lock); 1410 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1411 return -ENOSPC; 1412 } 1413again: 1414 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1415 alua_lu_gps_counter++; 1416 1417 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1418 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1419 if (!lu_gp_id) 1420 goto again; 1421 1422 pr_warn("ALUA Logical Unit Group ID: %hu" 1423 " already exists, ignoring request\n", 1424 lu_gp_id); 1425 spin_unlock(&lu_gps_lock); 1426 return -EINVAL; 1427 } 1428 } 1429 1430 lu_gp->lu_gp_id = lu_gp_id_tmp; 1431 lu_gp->lu_gp_valid_id = 1; 1432 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1433 alua_lu_gps_count++; 1434 spin_unlock(&lu_gps_lock); 1435 1436 return 0; 1437} 1438 1439static struct t10_alua_lu_gp_member * 1440core_alua_allocate_lu_gp_mem(struct se_device *dev) 1441{ 1442 struct t10_alua_lu_gp_member *lu_gp_mem; 1443 1444 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1445 if (!lu_gp_mem) { 1446 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1447 return ERR_PTR(-ENOMEM); 1448 } 1449 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1450 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1451 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1452 1453 lu_gp_mem->lu_gp_mem_dev = dev; 1454 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1455 1456 return lu_gp_mem; 1457} 1458 1459void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1460{ 1461 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1462 /* 1463 * Once we have reached this point, config_item_put() has 1464 * already been called from target_core_alua_drop_lu_gp(). 1465 * 1466 * Here, we remove the *lu_gp from the global list so that 1467 * no associations can be made while we are releasing 1468 * struct t10_alua_lu_gp. 1469 */ 1470 spin_lock(&lu_gps_lock); 1471 list_del(&lu_gp->lu_gp_node); 1472 alua_lu_gps_count--; 1473 spin_unlock(&lu_gps_lock); 1474 /* 1475 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1476 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1477 * released with core_alua_put_lu_gp_from_name() 1478 */ 1479 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1480 cpu_relax(); 1481 /* 1482 * Release reference to struct t10_alua_lu_gp * from all associated 1483 * struct se_device. 1484 */ 1485 spin_lock(&lu_gp->lu_gp_lock); 1486 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1487 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1488 if (lu_gp_mem->lu_gp_assoc) { 1489 list_del(&lu_gp_mem->lu_gp_mem_list); 1490 lu_gp->lu_gp_members--; 1491 lu_gp_mem->lu_gp_assoc = 0; 1492 } 1493 spin_unlock(&lu_gp->lu_gp_lock); 1494 /* 1495 * 1496 * lu_gp_mem is associated with a single 1497 * struct se_device->dev_alua_lu_gp_mem, and is released when 1498 * struct se_device is released via core_alua_free_lu_gp_mem(). 1499 * 1500 * If the passed lu_gp does NOT match the default_lu_gp, assume 1501 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1502 */ 1503 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1504 if (lu_gp != default_lu_gp) 1505 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1506 default_lu_gp); 1507 else 1508 lu_gp_mem->lu_gp = NULL; 1509 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1510 1511 spin_lock(&lu_gp->lu_gp_lock); 1512 } 1513 spin_unlock(&lu_gp->lu_gp_lock); 1514 1515 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1516} 1517 1518void core_alua_free_lu_gp_mem(struct se_device *dev) 1519{ 1520 struct t10_alua_lu_gp *lu_gp; 1521 struct t10_alua_lu_gp_member *lu_gp_mem; 1522 1523 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1524 if (!lu_gp_mem) 1525 return; 1526 1527 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1528 cpu_relax(); 1529 1530 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1531 lu_gp = lu_gp_mem->lu_gp; 1532 if (lu_gp) { 1533 spin_lock(&lu_gp->lu_gp_lock); 1534 if (lu_gp_mem->lu_gp_assoc) { 1535 list_del(&lu_gp_mem->lu_gp_mem_list); 1536 lu_gp->lu_gp_members--; 1537 lu_gp_mem->lu_gp_assoc = 0; 1538 } 1539 spin_unlock(&lu_gp->lu_gp_lock); 1540 lu_gp_mem->lu_gp = NULL; 1541 } 1542 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1543 1544 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1545} 1546 1547struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1548{ 1549 struct t10_alua_lu_gp *lu_gp; 1550 struct config_item *ci; 1551 1552 spin_lock(&lu_gps_lock); 1553 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1554 if (!lu_gp->lu_gp_valid_id) 1555 continue; 1556 ci = &lu_gp->lu_gp_group.cg_item; 1557 if (!strcmp(config_item_name(ci), name)) { 1558 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1559 spin_unlock(&lu_gps_lock); 1560 return lu_gp; 1561 } 1562 } 1563 spin_unlock(&lu_gps_lock); 1564 1565 return NULL; 1566} 1567 1568void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1569{ 1570 spin_lock(&lu_gps_lock); 1571 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1572 spin_unlock(&lu_gps_lock); 1573} 1574 1575/* 1576 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1577 */ 1578void __core_alua_attach_lu_gp_mem( 1579 struct t10_alua_lu_gp_member *lu_gp_mem, 1580 struct t10_alua_lu_gp *lu_gp) 1581{ 1582 spin_lock(&lu_gp->lu_gp_lock); 1583 lu_gp_mem->lu_gp = lu_gp; 1584 lu_gp_mem->lu_gp_assoc = 1; 1585 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1586 lu_gp->lu_gp_members++; 1587 spin_unlock(&lu_gp->lu_gp_lock); 1588} 1589 1590/* 1591 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1592 */ 1593void __core_alua_drop_lu_gp_mem( 1594 struct t10_alua_lu_gp_member *lu_gp_mem, 1595 struct t10_alua_lu_gp *lu_gp) 1596{ 1597 spin_lock(&lu_gp->lu_gp_lock); 1598 list_del(&lu_gp_mem->lu_gp_mem_list); 1599 lu_gp_mem->lu_gp = NULL; 1600 lu_gp_mem->lu_gp_assoc = 0; 1601 lu_gp->lu_gp_members--; 1602 spin_unlock(&lu_gp->lu_gp_lock); 1603} 1604 1605struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1606 const char *name, int def_group) 1607{ 1608 struct t10_alua_tg_pt_gp *tg_pt_gp; 1609 1610 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1611 if (!tg_pt_gp) { 1612 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1613 return NULL; 1614 } 1615 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1616 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1617 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex); 1618 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1619 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1620 tg_pt_gp->tg_pt_gp_dev = dev; 1621 tg_pt_gp->tg_pt_gp_alua_access_state = 1622 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED; 1623 /* 1624 * Enable both explicit and implicit ALUA support by default 1625 */ 1626 tg_pt_gp->tg_pt_gp_alua_access_type = 1627 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1628 /* 1629 * Set the default Active/NonOptimized Delay in milliseconds 1630 */ 1631 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1632 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1633 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1634 1635 /* 1636 * Enable all supported states 1637 */ 1638 tg_pt_gp->tg_pt_gp_alua_supported_states = 1639 ALUA_T_SUP | ALUA_O_SUP | 1640 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1641 1642 if (def_group) { 1643 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1644 tg_pt_gp->tg_pt_gp_id = 1645 dev->t10_alua.alua_tg_pt_gps_counter++; 1646 tg_pt_gp->tg_pt_gp_valid_id = 1; 1647 dev->t10_alua.alua_tg_pt_gps_count++; 1648 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1649 &dev->t10_alua.tg_pt_gps_list); 1650 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1651 } 1652 1653 return tg_pt_gp; 1654} 1655 1656int core_alua_set_tg_pt_gp_id( 1657 struct t10_alua_tg_pt_gp *tg_pt_gp, 1658 u16 tg_pt_gp_id) 1659{ 1660 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1661 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1662 u16 tg_pt_gp_id_tmp; 1663 1664 /* 1665 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1666 */ 1667 if (tg_pt_gp->tg_pt_gp_valid_id) { 1668 pr_warn("ALUA TG PT Group already has a valid ID," 1669 " ignoring request\n"); 1670 return -EINVAL; 1671 } 1672 1673 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1674 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1675 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1676 " 0x0000ffff reached\n"); 1677 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1678 return -ENOSPC; 1679 } 1680again: 1681 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1682 dev->t10_alua.alua_tg_pt_gps_counter++; 1683 1684 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1685 tg_pt_gp_list) { 1686 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1687 if (!tg_pt_gp_id) 1688 goto again; 1689 1690 pr_err("ALUA Target Port Group ID: %hu already" 1691 " exists, ignoring request\n", tg_pt_gp_id); 1692 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1693 return -EINVAL; 1694 } 1695 } 1696 1697 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1698 tg_pt_gp->tg_pt_gp_valid_id = 1; 1699 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1700 &dev->t10_alua.tg_pt_gps_list); 1701 dev->t10_alua.alua_tg_pt_gps_count++; 1702 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1703 1704 return 0; 1705} 1706 1707void core_alua_free_tg_pt_gp( 1708 struct t10_alua_tg_pt_gp *tg_pt_gp) 1709{ 1710 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1711 struct se_lun *lun, *next; 1712 1713 /* 1714 * Once we have reached this point, config_item_put() has already 1715 * been called from target_core_alua_drop_tg_pt_gp(). 1716 * 1717 * Here we remove *tg_pt_gp from the global list so that 1718 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1719 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1720 */ 1721 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1722 if (tg_pt_gp->tg_pt_gp_valid_id) { 1723 list_del(&tg_pt_gp->tg_pt_gp_list); 1724 dev->t10_alua.alua_tg_pt_gps_count--; 1725 } 1726 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1727 1728 /* 1729 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1730 * core_alua_get_tg_pt_gp_by_name() in 1731 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1732 * to be released with core_alua_put_tg_pt_gp_from_name(). 1733 */ 1734 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1735 cpu_relax(); 1736 1737 /* 1738 * Release reference to struct t10_alua_tg_pt_gp from all associated 1739 * struct se_port. 1740 */ 1741 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1742 list_for_each_entry_safe(lun, next, 1743 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1744 list_del_init(&lun->lun_tg_pt_gp_link); 1745 tg_pt_gp->tg_pt_gp_members--; 1746 1747 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1748 /* 1749 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1750 * assume we want to re-associate a given tg_pt_gp_mem with 1751 * default_tg_pt_gp. 1752 */ 1753 spin_lock(&lun->lun_tg_pt_gp_lock); 1754 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1755 __target_attach_tg_pt_gp(lun, 1756 dev->t10_alua.default_tg_pt_gp); 1757 } else 1758 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL); 1759 spin_unlock(&lun->lun_tg_pt_gp_lock); 1760 1761 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1762 } 1763 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1764 1765 synchronize_rcu(); 1766 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1767} 1768 1769static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1770 struct se_device *dev, const char *name) 1771{ 1772 struct t10_alua_tg_pt_gp *tg_pt_gp; 1773 struct config_item *ci; 1774 1775 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1776 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1777 tg_pt_gp_list) { 1778 if (!tg_pt_gp->tg_pt_gp_valid_id) 1779 continue; 1780 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1781 if (!strcmp(config_item_name(ci), name)) { 1782 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1783 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1784 return tg_pt_gp; 1785 } 1786 } 1787 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1788 1789 return NULL; 1790} 1791 1792static void core_alua_put_tg_pt_gp_from_name( 1793 struct t10_alua_tg_pt_gp *tg_pt_gp) 1794{ 1795 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1796 1797 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1798 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1799 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1800} 1801 1802static void __target_attach_tg_pt_gp(struct se_lun *lun, 1803 struct t10_alua_tg_pt_gp *tg_pt_gp) 1804{ 1805 struct se_dev_entry *se_deve; 1806 1807 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1808 1809 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1810 rcu_assign_pointer(lun->lun_tg_pt_gp, tg_pt_gp); 1811 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1812 tg_pt_gp->tg_pt_gp_members++; 1813 spin_lock(&lun->lun_deve_lock); 1814 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1815 core_scsi3_ua_allocate(se_deve, 0x3f, 1816 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1817 spin_unlock(&lun->lun_deve_lock); 1818 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1819} 1820 1821void target_attach_tg_pt_gp(struct se_lun *lun, 1822 struct t10_alua_tg_pt_gp *tg_pt_gp) 1823{ 1824 spin_lock(&lun->lun_tg_pt_gp_lock); 1825 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1826 spin_unlock(&lun->lun_tg_pt_gp_lock); 1827 synchronize_rcu(); 1828} 1829 1830static void __target_detach_tg_pt_gp(struct se_lun *lun, 1831 struct t10_alua_tg_pt_gp *tg_pt_gp) 1832{ 1833 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1834 1835 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1836 list_del_init(&lun->lun_tg_pt_gp_link); 1837 tg_pt_gp->tg_pt_gp_members--; 1838 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1839} 1840 1841void target_detach_tg_pt_gp(struct se_lun *lun) 1842{ 1843 struct t10_alua_tg_pt_gp *tg_pt_gp; 1844 1845 spin_lock(&lun->lun_tg_pt_gp_lock); 1846 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp, 1847 lockdep_is_held(&lun->lun_tg_pt_gp_lock)); 1848 if (tg_pt_gp) { 1849 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1850 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL); 1851 } 1852 spin_unlock(&lun->lun_tg_pt_gp_lock); 1853 synchronize_rcu(); 1854} 1855 1856static void target_swap_tg_pt_gp(struct se_lun *lun, 1857 struct t10_alua_tg_pt_gp *old_tg_pt_gp, 1858 struct t10_alua_tg_pt_gp *new_tg_pt_gp) 1859{ 1860 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1861 1862 if (old_tg_pt_gp) 1863 __target_detach_tg_pt_gp(lun, old_tg_pt_gp); 1864 __target_attach_tg_pt_gp(lun, new_tg_pt_gp); 1865} 1866 1867ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1868{ 1869 struct config_item *tg_pt_ci; 1870 struct t10_alua_tg_pt_gp *tg_pt_gp; 1871 ssize_t len = 0; 1872 1873 rcu_read_lock(); 1874 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 1875 if (tg_pt_gp) { 1876 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1877 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1878 " %hu\nTG Port Primary Access State: %s\nTG Port " 1879 "Primary Access Status: %s\nTG Port Secondary Access" 1880 " State: %s\nTG Port Secondary Access Status: %s\n", 1881 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1882 core_alua_dump_state( 1883 tg_pt_gp->tg_pt_gp_alua_access_state), 1884 core_alua_dump_status( 1885 tg_pt_gp->tg_pt_gp_alua_access_status), 1886 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1887 "Offline" : "None", 1888 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1889 } 1890 rcu_read_unlock(); 1891 1892 return len; 1893} 1894 1895ssize_t core_alua_store_tg_pt_gp_info( 1896 struct se_lun *lun, 1897 const char *page, 1898 size_t count) 1899{ 1900 struct se_portal_group *tpg = lun->lun_tpg; 1901 /* 1902 * rcu_dereference_raw protected by se_lun->lun_group symlink 1903 * reference to se_device->dev_group. 1904 */ 1905 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1906 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1907 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1908 int move = 0; 1909 1910 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 1911 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1912 return -ENODEV; 1913 1914 if (count > TG_PT_GROUP_NAME_BUF) { 1915 pr_err("ALUA Target Port Group alias too large!\n"); 1916 return -EINVAL; 1917 } 1918 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1919 memcpy(buf, page, count); 1920 /* 1921 * Any ALUA target port group alias besides "NULL" means we will be 1922 * making a new group association. 1923 */ 1924 if (strcmp(strstrip(buf), "NULL")) { 1925 /* 1926 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1927 * struct t10_alua_tg_pt_gp. This reference is released with 1928 * core_alua_put_tg_pt_gp_from_name() below. 1929 */ 1930 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1931 strstrip(buf)); 1932 if (!tg_pt_gp_new) 1933 return -ENODEV; 1934 } 1935 1936 spin_lock(&lun->lun_tg_pt_gp_lock); 1937 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp, 1938 lockdep_is_held(&lun->lun_tg_pt_gp_lock)); 1939 if (tg_pt_gp) { 1940 /* 1941 * Clearing an existing tg_pt_gp association, and replacing 1942 * with the default_tg_pt_gp. 1943 */ 1944 if (!tg_pt_gp_new) { 1945 pr_debug("Target_Core_ConfigFS: Moving" 1946 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 1947 " alua/%s, ID: %hu back to" 1948 " default_tg_pt_gp\n", 1949 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1950 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1951 config_item_name(&lun->lun_group.cg_item), 1952 config_item_name( 1953 &tg_pt_gp->tg_pt_gp_group.cg_item), 1954 tg_pt_gp->tg_pt_gp_id); 1955 1956 target_swap_tg_pt_gp(lun, tg_pt_gp, 1957 dev->t10_alua.default_tg_pt_gp); 1958 spin_unlock(&lun->lun_tg_pt_gp_lock); 1959 1960 goto sync_rcu; 1961 } 1962 move = 1; 1963 } 1964 1965 target_swap_tg_pt_gp(lun, tg_pt_gp, tg_pt_gp_new); 1966 spin_unlock(&lun->lun_tg_pt_gp_lock); 1967 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 1968 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 1969 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1970 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1971 config_item_name(&lun->lun_group.cg_item), 1972 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 1973 tg_pt_gp_new->tg_pt_gp_id); 1974 1975 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 1976sync_rcu: 1977 synchronize_rcu(); 1978 return count; 1979} 1980 1981ssize_t core_alua_show_access_type( 1982 struct t10_alua_tg_pt_gp *tg_pt_gp, 1983 char *page) 1984{ 1985 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 1986 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 1987 return sprintf(page, "Implicit and Explicit\n"); 1988 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 1989 return sprintf(page, "Implicit\n"); 1990 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 1991 return sprintf(page, "Explicit\n"); 1992 else 1993 return sprintf(page, "None\n"); 1994} 1995 1996ssize_t core_alua_store_access_type( 1997 struct t10_alua_tg_pt_gp *tg_pt_gp, 1998 const char *page, 1999 size_t count) 2000{ 2001 unsigned long tmp; 2002 int ret; 2003 2004 ret = kstrtoul(page, 0, &tmp); 2005 if (ret < 0) { 2006 pr_err("Unable to extract alua_access_type\n"); 2007 return ret; 2008 } 2009 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2010 pr_err("Illegal value for alua_access_type:" 2011 " %lu\n", tmp); 2012 return -EINVAL; 2013 } 2014 if (tmp == 3) 2015 tg_pt_gp->tg_pt_gp_alua_access_type = 2016 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2017 else if (tmp == 2) 2018 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2019 else if (tmp == 1) 2020 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2021 else 2022 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2023 2024 return count; 2025} 2026 2027ssize_t core_alua_show_nonop_delay_msecs( 2028 struct t10_alua_tg_pt_gp *tg_pt_gp, 2029 char *page) 2030{ 2031 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2032} 2033 2034ssize_t core_alua_store_nonop_delay_msecs( 2035 struct t10_alua_tg_pt_gp *tg_pt_gp, 2036 const char *page, 2037 size_t count) 2038{ 2039 unsigned long tmp; 2040 int ret; 2041 2042 ret = kstrtoul(page, 0, &tmp); 2043 if (ret < 0) { 2044 pr_err("Unable to extract nonop_delay_msecs\n"); 2045 return ret; 2046 } 2047 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2048 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2049 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2050 ALUA_MAX_NONOP_DELAY_MSECS); 2051 return -EINVAL; 2052 } 2053 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2054 2055 return count; 2056} 2057 2058ssize_t core_alua_show_trans_delay_msecs( 2059 struct t10_alua_tg_pt_gp *tg_pt_gp, 2060 char *page) 2061{ 2062 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2063} 2064 2065ssize_t core_alua_store_trans_delay_msecs( 2066 struct t10_alua_tg_pt_gp *tg_pt_gp, 2067 const char *page, 2068 size_t count) 2069{ 2070 unsigned long tmp; 2071 int ret; 2072 2073 ret = kstrtoul(page, 0, &tmp); 2074 if (ret < 0) { 2075 pr_err("Unable to extract trans_delay_msecs\n"); 2076 return ret; 2077 } 2078 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2079 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2080 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2081 ALUA_MAX_TRANS_DELAY_MSECS); 2082 return -EINVAL; 2083 } 2084 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2085 2086 return count; 2087} 2088 2089ssize_t core_alua_show_implicit_trans_secs( 2090 struct t10_alua_tg_pt_gp *tg_pt_gp, 2091 char *page) 2092{ 2093 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2094} 2095 2096ssize_t core_alua_store_implicit_trans_secs( 2097 struct t10_alua_tg_pt_gp *tg_pt_gp, 2098 const char *page, 2099 size_t count) 2100{ 2101 unsigned long tmp; 2102 int ret; 2103 2104 ret = kstrtoul(page, 0, &tmp); 2105 if (ret < 0) { 2106 pr_err("Unable to extract implicit_trans_secs\n"); 2107 return ret; 2108 } 2109 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2110 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2111 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2112 ALUA_MAX_IMPLICIT_TRANS_SECS); 2113 return -EINVAL; 2114 } 2115 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2116 2117 return count; 2118} 2119 2120ssize_t core_alua_show_preferred_bit( 2121 struct t10_alua_tg_pt_gp *tg_pt_gp, 2122 char *page) 2123{ 2124 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2125} 2126 2127ssize_t core_alua_store_preferred_bit( 2128 struct t10_alua_tg_pt_gp *tg_pt_gp, 2129 const char *page, 2130 size_t count) 2131{ 2132 unsigned long tmp; 2133 int ret; 2134 2135 ret = kstrtoul(page, 0, &tmp); 2136 if (ret < 0) { 2137 pr_err("Unable to extract preferred ALUA value\n"); 2138 return ret; 2139 } 2140 if ((tmp != 0) && (tmp != 1)) { 2141 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2142 return -EINVAL; 2143 } 2144 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2145 2146 return count; 2147} 2148 2149ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2150{ 2151 return sprintf(page, "%d\n", 2152 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2153} 2154 2155ssize_t core_alua_store_offline_bit( 2156 struct se_lun *lun, 2157 const char *page, 2158 size_t count) 2159{ 2160 /* 2161 * rcu_dereference_raw protected by se_lun->lun_group symlink 2162 * reference to se_device->dev_group. 2163 */ 2164 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2165 unsigned long tmp; 2166 int ret; 2167 2168 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 2169 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2170 return -ENODEV; 2171 2172 ret = kstrtoul(page, 0, &tmp); 2173 if (ret < 0) { 2174 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2175 return ret; 2176 } 2177 if ((tmp != 0) && (tmp != 1)) { 2178 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2179 tmp); 2180 return -EINVAL; 2181 } 2182 2183 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2184 if (ret < 0) 2185 return -EINVAL; 2186 2187 return count; 2188} 2189 2190ssize_t core_alua_show_secondary_status( 2191 struct se_lun *lun, 2192 char *page) 2193{ 2194 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2195} 2196 2197ssize_t core_alua_store_secondary_status( 2198 struct se_lun *lun, 2199 const char *page, 2200 size_t count) 2201{ 2202 unsigned long tmp; 2203 int ret; 2204 2205 ret = kstrtoul(page, 0, &tmp); 2206 if (ret < 0) { 2207 pr_err("Unable to extract alua_tg_pt_status\n"); 2208 return ret; 2209 } 2210 if ((tmp != ALUA_STATUS_NONE) && 2211 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2212 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2213 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2214 tmp); 2215 return -EINVAL; 2216 } 2217 lun->lun_tg_pt_secondary_stat = (int)tmp; 2218 2219 return count; 2220} 2221 2222ssize_t core_alua_show_secondary_write_metadata( 2223 struct se_lun *lun, 2224 char *page) 2225{ 2226 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2227} 2228 2229ssize_t core_alua_store_secondary_write_metadata( 2230 struct se_lun *lun, 2231 const char *page, 2232 size_t count) 2233{ 2234 unsigned long tmp; 2235 int ret; 2236 2237 ret = kstrtoul(page, 0, &tmp); 2238 if (ret < 0) { 2239 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2240 return ret; 2241 } 2242 if ((tmp != 0) && (tmp != 1)) { 2243 pr_err("Illegal value for alua_tg_pt_write_md:" 2244 " %lu\n", tmp); 2245 return -EINVAL; 2246 } 2247 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2248 2249 return count; 2250} 2251 2252int core_setup_alua(struct se_device *dev) 2253{ 2254 if (!(dev->transport_flags & 2255 TRANSPORT_FLAG_PASSTHROUGH_ALUA) && 2256 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2257 struct t10_alua_lu_gp_member *lu_gp_mem; 2258 2259 /* 2260 * Associate this struct se_device with the default ALUA 2261 * LUN Group. 2262 */ 2263 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2264 if (IS_ERR(lu_gp_mem)) 2265 return PTR_ERR(lu_gp_mem); 2266 2267 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2268 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2269 default_lu_gp); 2270 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2271 2272 pr_debug("%s: Adding to default ALUA LU Group:" 2273 " core/alua/lu_gps/default_lu_gp\n", 2274 dev->transport->name); 2275 } 2276 2277 return 0; 2278} 2279