1 /******************************************************************************* 2 * Filename: target_core_alua.c 3 * 4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) 5 * 6 * (c) Copyright 2009-2013 Datera, Inc. 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 26 #include <linux/slab.h> 27 #include <linux/spinlock.h> 28 #include <linux/configfs.h> 29 #include <linux/export.h> 30 #include <linux/file.h> 31 #include <scsi/scsi_proto.h> 32 #include <asm/unaligned.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_backend.h> 36 #include <target/target_core_fabric.h> 37 38 #include "target_core_internal.h" 39 #include "target_core_alua.h" 40 #include "target_core_ua.h" 41 42 static sense_reason_t core_alua_check_transition(int state, int valid, 43 int *primary); 44 static int core_alua_set_tg_pt_secondary_state( 45 struct se_lun *lun, int explicit, int offline); 46 47 static char *core_alua_dump_state(int state); 48 49 static void __target_attach_tg_pt_gp(struct se_lun *lun, 50 struct t10_alua_tg_pt_gp *tg_pt_gp); 51 52 static u16 alua_lu_gps_counter; 53 static u32 alua_lu_gps_count; 54 55 static DEFINE_SPINLOCK(lu_gps_lock); 56 static LIST_HEAD(lu_gps_list); 57 58 struct t10_alua_lu_gp *default_lu_gp; 59 60 /* 61 * REPORT REFERRALS 62 * 63 * See sbc3r35 section 5.23 64 */ 65 sense_reason_t 66 target_emulate_report_referrals(struct se_cmd *cmd) 67 { 68 struct se_device *dev = cmd->se_dev; 69 struct t10_alua_lba_map *map; 70 struct t10_alua_lba_map_member *map_mem; 71 unsigned char *buf; 72 u32 rd_len = 0, off; 73 74 if (cmd->data_length < 4) { 75 pr_warn("REPORT REFERRALS allocation length %u too" 76 " small\n", cmd->data_length); 77 return TCM_INVALID_CDB_FIELD; 78 } 79 80 buf = transport_kmap_data_sg(cmd); 81 if (!buf) 82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 83 84 off = 4; 85 spin_lock(&dev->t10_alua.lba_map_lock); 86 if (list_empty(&dev->t10_alua.lba_map_list)) { 87 spin_unlock(&dev->t10_alua.lba_map_lock); 88 transport_kunmap_data_sg(cmd); 89 90 return TCM_UNSUPPORTED_SCSI_OPCODE; 91 } 92 93 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 94 lba_map_list) { 95 int desc_num = off + 3; 96 int pg_num; 97 98 off += 4; 99 if (cmd->data_length > off) 100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 101 off += 8; 102 if (cmd->data_length > off) 103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 104 off += 8; 105 rd_len += 20; 106 pg_num = 0; 107 list_for_each_entry(map_mem, &map->lba_map_mem_list, 108 lba_map_mem_list) { 109 int alua_state = map_mem->lba_map_mem_alua_state; 110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 111 112 if (cmd->data_length > off) 113 buf[off] = alua_state & 0x0f; 114 off += 2; 115 if (cmd->data_length > off) 116 buf[off] = (alua_pg_id >> 8) & 0xff; 117 off++; 118 if (cmd->data_length > off) 119 buf[off] = (alua_pg_id & 0xff); 120 off++; 121 rd_len += 4; 122 pg_num++; 123 } 124 if (cmd->data_length > desc_num) 125 buf[desc_num] = pg_num; 126 } 127 spin_unlock(&dev->t10_alua.lba_map_lock); 128 129 /* 130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 131 */ 132 put_unaligned_be16(rd_len, &buf[2]); 133 134 transport_kunmap_data_sg(cmd); 135 136 target_complete_cmd(cmd, GOOD); 137 return 0; 138 } 139 140 /* 141 * REPORT_TARGET_PORT_GROUPS 142 * 143 * See spc4r17 section 6.27 144 */ 145 sense_reason_t 146 target_emulate_report_target_port_groups(struct se_cmd *cmd) 147 { 148 struct se_device *dev = cmd->se_dev; 149 struct t10_alua_tg_pt_gp *tg_pt_gp; 150 struct se_lun *lun; 151 unsigned char *buf; 152 u32 rd_len = 0, off; 153 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 154 155 /* 156 * Skip over RESERVED area to first Target port group descriptor 157 * depending on the PARAMETER DATA FORMAT type.. 158 */ 159 if (ext_hdr != 0) 160 off = 8; 161 else 162 off = 4; 163 164 if (cmd->data_length < off) { 165 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 166 " small for %s header\n", cmd->data_length, 167 (ext_hdr) ? "extended" : "normal"); 168 return TCM_INVALID_CDB_FIELD; 169 } 170 buf = transport_kmap_data_sg(cmd); 171 if (!buf) 172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 173 174 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 175 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 176 tg_pt_gp_list) { 177 /* 178 * Check if the Target port group and Target port descriptor list 179 * based on tg_pt_gp_members count will fit into the response payload. 180 * Otherwise, bump rd_len to let the initiator know we have exceeded 181 * the allocation length and the response is truncated. 182 */ 183 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 184 cmd->data_length) { 185 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 186 continue; 187 } 188 /* 189 * PREF: Preferred target port bit, determine if this 190 * bit should be set for port group. 191 */ 192 if (tg_pt_gp->tg_pt_gp_pref) 193 buf[off] = 0x80; 194 /* 195 * Set the ASYMMETRIC ACCESS State 196 */ 197 buf[off++] |= (atomic_read( 198 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 199 /* 200 * Set supported ASYMMETRIC ACCESS State bits 201 */ 202 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 203 /* 204 * TARGET PORT GROUP 205 */ 206 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 207 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 208 209 off++; /* Skip over Reserved */ 210 /* 211 * STATUS CODE 212 */ 213 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 214 /* 215 * Vendor Specific field 216 */ 217 buf[off++] = 0x00; 218 /* 219 * TARGET PORT COUNT 220 */ 221 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 222 rd_len += 8; 223 224 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 225 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 226 lun_tg_pt_gp_link) { 227 /* 228 * Start Target Port descriptor format 229 * 230 * See spc4r17 section 6.2.7 Table 247 231 */ 232 off += 2; /* Skip over Obsolete */ 233 /* 234 * Set RELATIVE TARGET PORT IDENTIFIER 235 */ 236 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff); 237 buf[off++] = (lun->lun_rtpi & 0xff); 238 rd_len += 4; 239 } 240 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 241 } 242 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 243 /* 244 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 245 */ 246 put_unaligned_be32(rd_len, &buf[0]); 247 248 /* 249 * Fill in the Extended header parameter data format if requested 250 */ 251 if (ext_hdr != 0) { 252 buf[4] = 0x10; 253 /* 254 * Set the implicit transition time (in seconds) for the application 255 * client to use as a base for it's transition timeout value. 256 * 257 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 258 * this CDB was received upon to determine this value individually 259 * for ALUA target port group. 260 */ 261 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock); 262 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp; 263 if (tg_pt_gp) 264 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 265 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock); 266 } 267 transport_kunmap_data_sg(cmd); 268 269 target_complete_cmd(cmd, GOOD); 270 return 0; 271 } 272 273 /* 274 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 275 * 276 * See spc4r17 section 6.35 277 */ 278 sense_reason_t 279 target_emulate_set_target_port_groups(struct se_cmd *cmd) 280 { 281 struct se_device *dev = cmd->se_dev; 282 struct se_lun *l_lun = cmd->se_lun; 283 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 284 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 285 unsigned char *buf; 286 unsigned char *ptr; 287 sense_reason_t rc = TCM_NO_SENSE; 288 u32 len = 4; /* Skip over RESERVED area in header */ 289 int alua_access_state, primary = 0, valid_states; 290 u16 tg_pt_id, rtpi; 291 292 if (cmd->data_length < 4) { 293 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 294 " small\n", cmd->data_length); 295 return TCM_INVALID_PARAMETER_LIST; 296 } 297 298 buf = transport_kmap_data_sg(cmd); 299 if (!buf) 300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 301 302 /* 303 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 304 * for the local tg_pt_gp. 305 */ 306 spin_lock(&l_lun->lun_tg_pt_gp_lock); 307 l_tg_pt_gp = l_lun->lun_tg_pt_gp; 308 if (!l_tg_pt_gp) { 309 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 310 pr_err("Unable to access l_lun->tg_pt_gp\n"); 311 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 312 goto out; 313 } 314 315 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 316 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 317 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 318 " while TPGS_EXPLICIT_ALUA is disabled\n"); 319 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 320 goto out; 321 } 322 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 323 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 324 325 ptr = &buf[4]; /* Skip over RESERVED area in header */ 326 327 while (len < cmd->data_length) { 328 bool found = false; 329 alua_access_state = (ptr[0] & 0x0f); 330 /* 331 * Check the received ALUA access state, and determine if 332 * the state is a primary or secondary target port asymmetric 333 * access state. 334 */ 335 rc = core_alua_check_transition(alua_access_state, 336 valid_states, &primary); 337 if (rc) { 338 /* 339 * If the SET TARGET PORT GROUPS attempts to establish 340 * an invalid combination of target port asymmetric 341 * access states or attempts to establish an 342 * unsupported target port asymmetric access state, 343 * then the command shall be terminated with CHECK 344 * CONDITION status, with the sense key set to ILLEGAL 345 * REQUEST, and the additional sense code set to INVALID 346 * FIELD IN PARAMETER LIST. 347 */ 348 goto out; 349 } 350 351 /* 352 * If the ASYMMETRIC ACCESS STATE field (see table 267) 353 * specifies a primary target port asymmetric access state, 354 * then the TARGET PORT GROUP OR TARGET PORT field specifies 355 * a primary target port group for which the primary target 356 * port asymmetric access state shall be changed. If the 357 * ASYMMETRIC ACCESS STATE field specifies a secondary target 358 * port asymmetric access state, then the TARGET PORT GROUP OR 359 * TARGET PORT field specifies the relative target port 360 * identifier (see 3.1.120) of the target port for which the 361 * secondary target port asymmetric access state shall be 362 * changed. 363 */ 364 if (primary) { 365 tg_pt_id = get_unaligned_be16(ptr + 2); 366 /* 367 * Locate the matching target port group ID from 368 * the global tg_pt_gp list 369 */ 370 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 371 list_for_each_entry(tg_pt_gp, 372 &dev->t10_alua.tg_pt_gps_list, 373 tg_pt_gp_list) { 374 if (!tg_pt_gp->tg_pt_gp_valid_id) 375 continue; 376 377 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 378 continue; 379 380 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 381 382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 383 384 if (!core_alua_do_port_transition(tg_pt_gp, 385 dev, l_lun, nacl, 386 alua_access_state, 1)) 387 found = true; 388 389 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 390 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 391 break; 392 } 393 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 394 } else { 395 struct se_lun *lun; 396 397 /* 398 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 399 * the Target Port in question for the the incoming 400 * SET_TARGET_PORT_GROUPS op. 401 */ 402 rtpi = get_unaligned_be16(ptr + 2); 403 /* 404 * Locate the matching relative target port identifier 405 * for the struct se_device storage object. 406 */ 407 spin_lock(&dev->se_port_lock); 408 list_for_each_entry(lun, &dev->dev_sep_list, 409 lun_dev_link) { 410 if (lun->lun_rtpi != rtpi) 411 continue; 412 413 // XXX: racy unlock 414 spin_unlock(&dev->se_port_lock); 415 416 if (!core_alua_set_tg_pt_secondary_state( 417 lun, 1, 1)) 418 found = true; 419 420 spin_lock(&dev->se_port_lock); 421 break; 422 } 423 spin_unlock(&dev->se_port_lock); 424 } 425 426 if (!found) { 427 rc = TCM_INVALID_PARAMETER_LIST; 428 goto out; 429 } 430 431 ptr += 4; 432 len += 4; 433 } 434 435 out: 436 transport_kunmap_data_sg(cmd); 437 if (!rc) 438 target_complete_cmd(cmd, GOOD); 439 return rc; 440 } 441 442 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq) 443 { 444 /* 445 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 446 * The ALUA additional sense code qualifier (ASCQ) is determined 447 * by the ALUA primary or secondary access state.. 448 */ 449 pr_debug("[%s]: ALUA TG Port not available, " 450 "SenseKey: NOT_READY, ASC/ASCQ: " 451 "0x04/0x%02x\n", 452 cmd->se_tfo->get_fabric_name(), alua_ascq); 453 454 cmd->scsi_asc = 0x04; 455 cmd->scsi_ascq = alua_ascq; 456 } 457 458 static inline void core_alua_state_nonoptimized( 459 struct se_cmd *cmd, 460 unsigned char *cdb, 461 int nonop_delay_msecs) 462 { 463 /* 464 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 465 * later to determine if processing of this cmd needs to be 466 * temporarily delayed for the Active/NonOptimized primary access state. 467 */ 468 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 469 cmd->alua_nonop_delay = nonop_delay_msecs; 470 } 471 472 static inline int core_alua_state_lba_dependent( 473 struct se_cmd *cmd, 474 struct t10_alua_tg_pt_gp *tg_pt_gp) 475 { 476 struct se_device *dev = cmd->se_dev; 477 u64 segment_size, segment_mult, sectors, lba; 478 479 /* Only need to check for cdb actually containing LBAs */ 480 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 481 return 0; 482 483 spin_lock(&dev->t10_alua.lba_map_lock); 484 segment_size = dev->t10_alua.lba_map_segment_size; 485 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 486 sectors = cmd->data_length / dev->dev_attrib.block_size; 487 488 lba = cmd->t_task_lba; 489 while (lba < cmd->t_task_lba + sectors) { 490 struct t10_alua_lba_map *cur_map = NULL, *map; 491 struct t10_alua_lba_map_member *map_mem; 492 493 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 494 lba_map_list) { 495 u64 start_lba, last_lba; 496 u64 first_lba = map->lba_map_first_lba; 497 498 if (segment_mult) { 499 u64 tmp = lba; 500 start_lba = do_div(tmp, segment_size * segment_mult); 501 502 last_lba = first_lba + segment_size - 1; 503 if (start_lba >= first_lba && 504 start_lba <= last_lba) { 505 lba += segment_size; 506 cur_map = map; 507 break; 508 } 509 } else { 510 last_lba = map->lba_map_last_lba; 511 if (lba >= first_lba && lba <= last_lba) { 512 lba = last_lba + 1; 513 cur_map = map; 514 break; 515 } 516 } 517 } 518 if (!cur_map) { 519 spin_unlock(&dev->t10_alua.lba_map_lock); 520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 521 return 1; 522 } 523 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 524 lba_map_mem_list) { 525 if (map_mem->lba_map_mem_alua_pg_id != 526 tg_pt_gp->tg_pt_gp_id) 527 continue; 528 switch(map_mem->lba_map_mem_alua_state) { 529 case ALUA_ACCESS_STATE_STANDBY: 530 spin_unlock(&dev->t10_alua.lba_map_lock); 531 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 532 return 1; 533 case ALUA_ACCESS_STATE_UNAVAILABLE: 534 spin_unlock(&dev->t10_alua.lba_map_lock); 535 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 536 return 1; 537 default: 538 break; 539 } 540 } 541 } 542 spin_unlock(&dev->t10_alua.lba_map_lock); 543 return 0; 544 } 545 546 static inline int core_alua_state_standby( 547 struct se_cmd *cmd, 548 unsigned char *cdb) 549 { 550 /* 551 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 552 * spc4r17 section 5.9.2.4.4 553 */ 554 switch (cdb[0]) { 555 case INQUIRY: 556 case LOG_SELECT: 557 case LOG_SENSE: 558 case MODE_SELECT: 559 case MODE_SENSE: 560 case REPORT_LUNS: 561 case RECEIVE_DIAGNOSTIC: 562 case SEND_DIAGNOSTIC: 563 case READ_CAPACITY: 564 return 0; 565 case SERVICE_ACTION_IN_16: 566 switch (cdb[1] & 0x1f) { 567 case SAI_READ_CAPACITY_16: 568 return 0; 569 default: 570 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 571 return 1; 572 } 573 case MAINTENANCE_IN: 574 switch (cdb[1] & 0x1f) { 575 case MI_REPORT_TARGET_PGS: 576 return 0; 577 default: 578 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 579 return 1; 580 } 581 case MAINTENANCE_OUT: 582 switch (cdb[1]) { 583 case MO_SET_TARGET_PGS: 584 return 0; 585 default: 586 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 587 return 1; 588 } 589 case REQUEST_SENSE: 590 case PERSISTENT_RESERVE_IN: 591 case PERSISTENT_RESERVE_OUT: 592 case READ_BUFFER: 593 case WRITE_BUFFER: 594 return 0; 595 default: 596 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 597 return 1; 598 } 599 600 return 0; 601 } 602 603 static inline int core_alua_state_unavailable( 604 struct se_cmd *cmd, 605 unsigned char *cdb) 606 { 607 /* 608 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 609 * spc4r17 section 5.9.2.4.5 610 */ 611 switch (cdb[0]) { 612 case INQUIRY: 613 case REPORT_LUNS: 614 return 0; 615 case MAINTENANCE_IN: 616 switch (cdb[1] & 0x1f) { 617 case MI_REPORT_TARGET_PGS: 618 return 0; 619 default: 620 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 621 return 1; 622 } 623 case MAINTENANCE_OUT: 624 switch (cdb[1]) { 625 case MO_SET_TARGET_PGS: 626 return 0; 627 default: 628 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 629 return 1; 630 } 631 case REQUEST_SENSE: 632 case READ_BUFFER: 633 case WRITE_BUFFER: 634 return 0; 635 default: 636 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 637 return 1; 638 } 639 640 return 0; 641 } 642 643 static inline int core_alua_state_transition( 644 struct se_cmd *cmd, 645 unsigned char *cdb) 646 { 647 /* 648 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 649 * spc4r17 section 5.9.2.5 650 */ 651 switch (cdb[0]) { 652 case INQUIRY: 653 case REPORT_LUNS: 654 return 0; 655 case MAINTENANCE_IN: 656 switch (cdb[1] & 0x1f) { 657 case MI_REPORT_TARGET_PGS: 658 return 0; 659 default: 660 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 661 return 1; 662 } 663 case REQUEST_SENSE: 664 case READ_BUFFER: 665 case WRITE_BUFFER: 666 return 0; 667 default: 668 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 669 return 1; 670 } 671 672 return 0; 673 } 674 675 /* 676 * return 1: Is used to signal LUN not accessible, and check condition/not ready 677 * return 0: Used to signal success 678 * return -1: Used to signal failure, and invalid cdb field 679 */ 680 sense_reason_t 681 target_alua_state_check(struct se_cmd *cmd) 682 { 683 struct se_device *dev = cmd->se_dev; 684 unsigned char *cdb = cmd->t_task_cdb; 685 struct se_lun *lun = cmd->se_lun; 686 struct t10_alua_tg_pt_gp *tg_pt_gp; 687 int out_alua_state, nonop_delay_msecs; 688 689 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 690 return 0; 691 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 692 return 0; 693 694 /* 695 * First, check for a struct se_port specific secondary ALUA target port 696 * access state: OFFLINE 697 */ 698 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) { 699 pr_debug("ALUA: Got secondary offline status for local" 700 " target port\n"); 701 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE); 702 return TCM_CHECK_CONDITION_NOT_READY; 703 } 704 705 if (!lun->lun_tg_pt_gp) 706 return 0; 707 708 spin_lock(&lun->lun_tg_pt_gp_lock); 709 tg_pt_gp = lun->lun_tg_pt_gp; 710 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 711 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 712 713 // XXX: keeps using tg_pt_gp witout reference after unlock 714 spin_unlock(&lun->lun_tg_pt_gp_lock); 715 /* 716 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 717 * statement so the compiler knows explicitly to check this case first. 718 * For the Optimized ALUA access state case, we want to process the 719 * incoming fabric cmd ASAP.. 720 */ 721 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 722 return 0; 723 724 switch (out_alua_state) { 725 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 726 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 727 break; 728 case ALUA_ACCESS_STATE_STANDBY: 729 if (core_alua_state_standby(cmd, cdb)) 730 return TCM_CHECK_CONDITION_NOT_READY; 731 break; 732 case ALUA_ACCESS_STATE_UNAVAILABLE: 733 if (core_alua_state_unavailable(cmd, cdb)) 734 return TCM_CHECK_CONDITION_NOT_READY; 735 break; 736 case ALUA_ACCESS_STATE_TRANSITION: 737 if (core_alua_state_transition(cmd, cdb)) 738 return TCM_CHECK_CONDITION_NOT_READY; 739 break; 740 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 741 if (core_alua_state_lba_dependent(cmd, tg_pt_gp)) 742 return TCM_CHECK_CONDITION_NOT_READY; 743 break; 744 /* 745 * OFFLINE is a secondary ALUA target port group access state, that is 746 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1 747 */ 748 case ALUA_ACCESS_STATE_OFFLINE: 749 default: 750 pr_err("Unknown ALUA access state: 0x%02x\n", 751 out_alua_state); 752 return TCM_INVALID_CDB_FIELD; 753 } 754 755 return 0; 756 } 757 758 /* 759 * Check implicit and explicit ALUA state change request. 760 */ 761 static sense_reason_t 762 core_alua_check_transition(int state, int valid, int *primary) 763 { 764 /* 765 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 766 * defined as primary target port asymmetric access states. 767 */ 768 switch (state) { 769 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 770 if (!(valid & ALUA_AO_SUP)) 771 goto not_supported; 772 *primary = 1; 773 break; 774 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 775 if (!(valid & ALUA_AN_SUP)) 776 goto not_supported; 777 *primary = 1; 778 break; 779 case ALUA_ACCESS_STATE_STANDBY: 780 if (!(valid & ALUA_S_SUP)) 781 goto not_supported; 782 *primary = 1; 783 break; 784 case ALUA_ACCESS_STATE_UNAVAILABLE: 785 if (!(valid & ALUA_U_SUP)) 786 goto not_supported; 787 *primary = 1; 788 break; 789 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 790 if (!(valid & ALUA_LBD_SUP)) 791 goto not_supported; 792 *primary = 1; 793 break; 794 case ALUA_ACCESS_STATE_OFFLINE: 795 /* 796 * OFFLINE state is defined as a secondary target port 797 * asymmetric access state. 798 */ 799 if (!(valid & ALUA_O_SUP)) 800 goto not_supported; 801 *primary = 0; 802 break; 803 case ALUA_ACCESS_STATE_TRANSITION: 804 /* 805 * Transitioning is set internally, and 806 * cannot be selected manually. 807 */ 808 goto not_supported; 809 default: 810 pr_err("Unknown ALUA access state: 0x%02x\n", state); 811 return TCM_INVALID_PARAMETER_LIST; 812 } 813 814 return 0; 815 816 not_supported: 817 pr_err("ALUA access state %s not supported", 818 core_alua_dump_state(state)); 819 return TCM_INVALID_PARAMETER_LIST; 820 } 821 822 static char *core_alua_dump_state(int state) 823 { 824 switch (state) { 825 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 826 return "Active/Optimized"; 827 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 828 return "Active/NonOptimized"; 829 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 830 return "LBA Dependent"; 831 case ALUA_ACCESS_STATE_STANDBY: 832 return "Standby"; 833 case ALUA_ACCESS_STATE_UNAVAILABLE: 834 return "Unavailable"; 835 case ALUA_ACCESS_STATE_OFFLINE: 836 return "Offline"; 837 case ALUA_ACCESS_STATE_TRANSITION: 838 return "Transitioning"; 839 default: 840 return "Unknown"; 841 } 842 843 return NULL; 844 } 845 846 char *core_alua_dump_status(int status) 847 { 848 switch (status) { 849 case ALUA_STATUS_NONE: 850 return "None"; 851 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 852 return "Altered by Explicit STPG"; 853 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 854 return "Altered by Implicit ALUA"; 855 default: 856 return "Unknown"; 857 } 858 859 return NULL; 860 } 861 862 /* 863 * Used by fabric modules to determine when we need to delay processing 864 * for the Active/NonOptimized paths.. 865 */ 866 int core_alua_check_nonop_delay( 867 struct se_cmd *cmd) 868 { 869 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 870 return 0; 871 if (in_interrupt()) 872 return 0; 873 /* 874 * The ALUA Active/NonOptimized access state delay can be disabled 875 * in via configfs with a value of zero 876 */ 877 if (!cmd->alua_nonop_delay) 878 return 0; 879 /* 880 * struct se_cmd->alua_nonop_delay gets set by a target port group 881 * defined interval in core_alua_state_nonoptimized() 882 */ 883 msleep_interruptible(cmd->alua_nonop_delay); 884 return 0; 885 } 886 EXPORT_SYMBOL(core_alua_check_nonop_delay); 887 888 static int core_alua_write_tpg_metadata( 889 const char *path, 890 unsigned char *md_buf, 891 u32 md_buf_len) 892 { 893 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 894 int ret; 895 896 if (IS_ERR(file)) { 897 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 898 return -ENODEV; 899 } 900 ret = kernel_write(file, md_buf, md_buf_len, 0); 901 if (ret < 0) 902 pr_err("Error writing ALUA metadata file: %s\n", path); 903 fput(file); 904 return (ret < 0) ? -EIO : 0; 905 } 906 907 /* 908 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 909 */ 910 static int core_alua_update_tpg_primary_metadata( 911 struct t10_alua_tg_pt_gp *tg_pt_gp) 912 { 913 unsigned char *md_buf; 914 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 915 char path[ALUA_METADATA_PATH_LEN]; 916 int len, rc; 917 918 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 919 if (!md_buf) { 920 pr_err("Unable to allocate buf for ALUA metadata\n"); 921 return -ENOMEM; 922 } 923 924 memset(path, 0, ALUA_METADATA_PATH_LEN); 925 926 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 927 "tg_pt_gp_id=%hu\n" 928 "alua_access_state=0x%02x\n" 929 "alua_access_status=0x%02x\n", 930 tg_pt_gp->tg_pt_gp_id, 931 tg_pt_gp->tg_pt_gp_alua_pending_state, 932 tg_pt_gp->tg_pt_gp_alua_access_status); 933 934 snprintf(path, ALUA_METADATA_PATH_LEN, 935 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], 936 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 937 938 rc = core_alua_write_tpg_metadata(path, md_buf, len); 939 kfree(md_buf); 940 return rc; 941 } 942 943 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) 944 { 945 struct se_dev_entry *se_deve; 946 struct se_lun *lun; 947 struct se_lun_acl *lacl; 948 949 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 950 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 951 lun_tg_pt_gp_link) { 952 /* 953 * After an implicit target port asymmetric access state 954 * change, a device server shall establish a unit attention 955 * condition for the initiator port associated with every I_T 956 * nexus with the additional sense code set to ASYMMETRIC 957 * ACCESS STATE CHANGED. 958 * 959 * After an explicit target port asymmetric access state 960 * change, a device server shall establish a unit attention 961 * condition with the additional sense code set to ASYMMETRIC 962 * ACCESS STATE CHANGED for the initiator port associated with 963 * every I_T nexus other than the I_T nexus on which the SET 964 * TARGET PORT GROUPS command 965 */ 966 if (!percpu_ref_tryget_live(&lun->lun_ref)) 967 continue; 968 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 969 970 spin_lock(&lun->lun_deve_lock); 971 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { 972 lacl = rcu_dereference_check(se_deve->se_lun_acl, 973 lockdep_is_held(&lun->lun_deve_lock)); 974 975 /* 976 * spc4r37 p.242: 977 * After an explicit target port asymmetric access 978 * state change, a device server shall establish a 979 * unit attention condition with the additional sense 980 * code set to ASYMMETRIC ACCESS STATE CHANGED for 981 * the initiator port associated with every I_T nexus 982 * other than the I_T nexus on which the SET TARGET 983 * PORT GROUPS command was received. 984 */ 985 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 986 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 987 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && 988 (tg_pt_gp->tg_pt_gp_alua_lun == lun)) 989 continue; 990 991 /* 992 * se_deve->se_lun_acl pointer may be NULL for a 993 * entry created without explicit Node+MappedLUN ACLs 994 */ 995 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 996 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) 997 continue; 998 999 core_scsi3_ua_allocate(se_deve, 0x2A, 1000 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1001 } 1002 spin_unlock(&lun->lun_deve_lock); 1003 1004 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1005 percpu_ref_put(&lun->lun_ref); 1006 } 1007 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1008 } 1009 1010 static void core_alua_do_transition_tg_pt_work(struct work_struct *work) 1011 { 1012 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, 1013 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work); 1014 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1015 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == 1016 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); 1017 1018 /* 1019 * Update the ALUA metadata buf that has been allocated in 1020 * core_alua_do_port_transition(), this metadata will be written 1021 * to struct file. 1022 * 1023 * Note that there is the case where we do not want to update the 1024 * metadata when the saved metadata is being parsed in userspace 1025 * when setting the existing port access state and access status. 1026 * 1027 * Also note that the failure to write out the ALUA metadata to 1028 * struct file does NOT affect the actual ALUA transition. 1029 */ 1030 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1031 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1032 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1033 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1034 } 1035 /* 1036 * Set the current primary ALUA access state to the requested new state 1037 */ 1038 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1039 tg_pt_gp->tg_pt_gp_alua_pending_state); 1040 1041 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1042 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1043 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1044 tg_pt_gp->tg_pt_gp_id, 1045 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1046 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1047 1048 core_alua_queue_state_change_ua(tg_pt_gp); 1049 1050 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1051 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1052 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1053 1054 if (tg_pt_gp->tg_pt_gp_transition_complete) 1055 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1056 } 1057 1058 static int core_alua_do_transition_tg_pt( 1059 struct t10_alua_tg_pt_gp *tg_pt_gp, 1060 int new_state, 1061 int explicit) 1062 { 1063 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1064 DECLARE_COMPLETION_ONSTACK(wait); 1065 1066 /* Nothing to be done here */ 1067 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1068 return 0; 1069 1070 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1071 return -EAGAIN; 1072 1073 /* 1074 * Flush any pending transitions 1075 */ 1076 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && 1077 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1078 ALUA_ACCESS_STATE_TRANSITION) { 1079 /* Just in case */ 1080 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1081 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1082 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1083 wait_for_completion(&wait); 1084 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1085 return 0; 1086 } 1087 1088 /* 1089 * Save the old primary ALUA access state, and set the current state 1090 * to ALUA_ACCESS_STATE_TRANSITION. 1091 */ 1092 tg_pt_gp->tg_pt_gp_alua_previous_state = 1093 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1094 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1095 1096 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1097 ALUA_ACCESS_STATE_TRANSITION); 1098 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1099 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1100 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1101 1102 core_alua_queue_state_change_ua(tg_pt_gp); 1103 1104 /* 1105 * Check for the optional ALUA primary state transition delay 1106 */ 1107 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1108 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1109 1110 /* 1111 * Take a reference for workqueue item 1112 */ 1113 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1114 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1115 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1116 1117 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { 1118 unsigned long transition_tmo; 1119 1120 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; 1121 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1122 &tg_pt_gp->tg_pt_gp_transition_work, 1123 transition_tmo); 1124 } else { 1125 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1126 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1127 &tg_pt_gp->tg_pt_gp_transition_work, 0); 1128 wait_for_completion(&wait); 1129 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1130 } 1131 1132 return 0; 1133 } 1134 1135 int core_alua_do_port_transition( 1136 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1137 struct se_device *l_dev, 1138 struct se_lun *l_lun, 1139 struct se_node_acl *l_nacl, 1140 int new_state, 1141 int explicit) 1142 { 1143 struct se_device *dev; 1144 struct t10_alua_lu_gp *lu_gp; 1145 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1146 struct t10_alua_tg_pt_gp *tg_pt_gp; 1147 int primary, valid_states, rc = 0; 1148 1149 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1150 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1151 return -EINVAL; 1152 1153 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1154 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1155 lu_gp = local_lu_gp_mem->lu_gp; 1156 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1157 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1158 /* 1159 * For storage objects that are members of the 'default_lu_gp', 1160 * we only do transition on the passed *l_tp_pt_gp, and not 1161 * on all of the matching target port groups IDs in default_lu_gp. 1162 */ 1163 if (!lu_gp->lu_gp_id) { 1164 /* 1165 * core_alua_do_transition_tg_pt() will always return 1166 * success. 1167 */ 1168 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1169 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1170 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1171 new_state, explicit); 1172 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1173 return rc; 1174 } 1175 /* 1176 * For all other LU groups aside from 'default_lu_gp', walk all of 1177 * the associated storage objects looking for a matching target port 1178 * group ID from the local target port group. 1179 */ 1180 spin_lock(&lu_gp->lu_gp_lock); 1181 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1182 lu_gp_mem_list) { 1183 1184 dev = lu_gp_mem->lu_gp_mem_dev; 1185 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1186 spin_unlock(&lu_gp->lu_gp_lock); 1187 1188 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1189 list_for_each_entry(tg_pt_gp, 1190 &dev->t10_alua.tg_pt_gps_list, 1191 tg_pt_gp_list) { 1192 1193 if (!tg_pt_gp->tg_pt_gp_valid_id) 1194 continue; 1195 /* 1196 * If the target behavior port asymmetric access state 1197 * is changed for any target port group accessible via 1198 * a logical unit within a LU group, the target port 1199 * behavior group asymmetric access states for the same 1200 * target port group accessible via other logical units 1201 * in that LU group will also change. 1202 */ 1203 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1204 continue; 1205 1206 if (l_tg_pt_gp == tg_pt_gp) { 1207 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1208 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1209 } else { 1210 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1211 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1212 } 1213 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1214 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1215 /* 1216 * core_alua_do_transition_tg_pt() will always return 1217 * success. 1218 */ 1219 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1220 new_state, explicit); 1221 1222 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1223 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1224 if (rc) 1225 break; 1226 } 1227 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1228 1229 spin_lock(&lu_gp->lu_gp_lock); 1230 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1231 } 1232 spin_unlock(&lu_gp->lu_gp_lock); 1233 1234 if (!rc) { 1235 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1236 " Group IDs: %hu %s transition to primary state: %s\n", 1237 config_item_name(&lu_gp->lu_gp_group.cg_item), 1238 l_tg_pt_gp->tg_pt_gp_id, 1239 (explicit) ? "explicit" : "implicit", 1240 core_alua_dump_state(new_state)); 1241 } 1242 1243 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1244 return rc; 1245 } 1246 1247 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1248 { 1249 struct se_portal_group *se_tpg = lun->lun_tpg; 1250 unsigned char *md_buf; 1251 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1252 int len, rc; 1253 1254 mutex_lock(&lun->lun_tg_pt_md_mutex); 1255 1256 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1257 if (!md_buf) { 1258 pr_err("Unable to allocate buf for ALUA metadata\n"); 1259 rc = -ENOMEM; 1260 goto out_unlock; 1261 } 1262 1263 memset(path, 0, ALUA_METADATA_PATH_LEN); 1264 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1265 1266 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1267 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1268 1269 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1270 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1271 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1272 1273 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1274 "alua_tg_pt_status=0x%02x\n", 1275 atomic_read(&lun->lun_tg_pt_secondary_offline), 1276 lun->lun_tg_pt_secondary_stat); 1277 1278 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%llu", 1279 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1280 lun->unpacked_lun); 1281 1282 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1283 kfree(md_buf); 1284 1285 out_unlock: 1286 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1287 return rc; 1288 } 1289 1290 static int core_alua_set_tg_pt_secondary_state( 1291 struct se_lun *lun, 1292 int explicit, 1293 int offline) 1294 { 1295 struct t10_alua_tg_pt_gp *tg_pt_gp; 1296 int trans_delay_msecs; 1297 1298 spin_lock(&lun->lun_tg_pt_gp_lock); 1299 tg_pt_gp = lun->lun_tg_pt_gp; 1300 if (!tg_pt_gp) { 1301 spin_unlock(&lun->lun_tg_pt_gp_lock); 1302 pr_err("Unable to complete secondary state" 1303 " transition\n"); 1304 return -EINVAL; 1305 } 1306 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1307 /* 1308 * Set the secondary ALUA target port access state to OFFLINE 1309 * or release the previously secondary state for struct se_lun 1310 */ 1311 if (offline) 1312 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1313 else 1314 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1315 1316 lun->lun_tg_pt_secondary_stat = (explicit) ? 1317 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1318 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1319 1320 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1321 " to secondary access state: %s\n", (explicit) ? "explicit" : 1322 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1323 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1324 1325 spin_unlock(&lun->lun_tg_pt_gp_lock); 1326 /* 1327 * Do the optional transition delay after we set the secondary 1328 * ALUA access state. 1329 */ 1330 if (trans_delay_msecs != 0) 1331 msleep_interruptible(trans_delay_msecs); 1332 /* 1333 * See if we need to update the ALUA fabric port metadata for 1334 * secondary state and status 1335 */ 1336 if (lun->lun_tg_pt_secondary_write_md) 1337 core_alua_update_tpg_secondary_metadata(lun); 1338 1339 return 0; 1340 } 1341 1342 struct t10_alua_lba_map * 1343 core_alua_allocate_lba_map(struct list_head *list, 1344 u64 first_lba, u64 last_lba) 1345 { 1346 struct t10_alua_lba_map *lba_map; 1347 1348 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1349 if (!lba_map) { 1350 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1351 return ERR_PTR(-ENOMEM); 1352 } 1353 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1354 lba_map->lba_map_first_lba = first_lba; 1355 lba_map->lba_map_last_lba = last_lba; 1356 1357 list_add_tail(&lba_map->lba_map_list, list); 1358 return lba_map; 1359 } 1360 1361 int 1362 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1363 int pg_id, int state) 1364 { 1365 struct t10_alua_lba_map_member *lba_map_mem; 1366 1367 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1368 lba_map_mem_list) { 1369 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1370 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1371 return -EINVAL; 1372 } 1373 } 1374 1375 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1376 if (!lba_map_mem) { 1377 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1378 return -ENOMEM; 1379 } 1380 lba_map_mem->lba_map_mem_alua_state = state; 1381 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1382 1383 list_add_tail(&lba_map_mem->lba_map_mem_list, 1384 &lba_map->lba_map_mem_list); 1385 return 0; 1386 } 1387 1388 void 1389 core_alua_free_lba_map(struct list_head *lba_list) 1390 { 1391 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1392 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1393 1394 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1395 lba_map_list) { 1396 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1397 &lba_map->lba_map_mem_list, 1398 lba_map_mem_list) { 1399 list_del(&lba_map_mem->lba_map_mem_list); 1400 kmem_cache_free(t10_alua_lba_map_mem_cache, 1401 lba_map_mem); 1402 } 1403 list_del(&lba_map->lba_map_list); 1404 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1405 } 1406 } 1407 1408 void 1409 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1410 int segment_size, int segment_mult) 1411 { 1412 struct list_head old_lba_map_list; 1413 struct t10_alua_tg_pt_gp *tg_pt_gp; 1414 int activate = 0, supported; 1415 1416 INIT_LIST_HEAD(&old_lba_map_list); 1417 spin_lock(&dev->t10_alua.lba_map_lock); 1418 dev->t10_alua.lba_map_segment_size = segment_size; 1419 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1420 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1421 if (lba_map_list) { 1422 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1423 activate = 1; 1424 } 1425 spin_unlock(&dev->t10_alua.lba_map_lock); 1426 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1427 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1428 tg_pt_gp_list) { 1429 1430 if (!tg_pt_gp->tg_pt_gp_valid_id) 1431 continue; 1432 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1433 if (activate) 1434 supported |= ALUA_LBD_SUP; 1435 else 1436 supported &= ~ALUA_LBD_SUP; 1437 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1438 } 1439 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1440 core_alua_free_lba_map(&old_lba_map_list); 1441 } 1442 1443 struct t10_alua_lu_gp * 1444 core_alua_allocate_lu_gp(const char *name, int def_group) 1445 { 1446 struct t10_alua_lu_gp *lu_gp; 1447 1448 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1449 if (!lu_gp) { 1450 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1451 return ERR_PTR(-ENOMEM); 1452 } 1453 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1454 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1455 spin_lock_init(&lu_gp->lu_gp_lock); 1456 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1457 1458 if (def_group) { 1459 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1460 lu_gp->lu_gp_valid_id = 1; 1461 alua_lu_gps_count++; 1462 } 1463 1464 return lu_gp; 1465 } 1466 1467 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1468 { 1469 struct t10_alua_lu_gp *lu_gp_tmp; 1470 u16 lu_gp_id_tmp; 1471 /* 1472 * The lu_gp->lu_gp_id may only be set once.. 1473 */ 1474 if (lu_gp->lu_gp_valid_id) { 1475 pr_warn("ALUA LU Group already has a valid ID," 1476 " ignoring request\n"); 1477 return -EINVAL; 1478 } 1479 1480 spin_lock(&lu_gps_lock); 1481 if (alua_lu_gps_count == 0x0000ffff) { 1482 pr_err("Maximum ALUA alua_lu_gps_count:" 1483 " 0x0000ffff reached\n"); 1484 spin_unlock(&lu_gps_lock); 1485 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1486 return -ENOSPC; 1487 } 1488 again: 1489 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1490 alua_lu_gps_counter++; 1491 1492 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1493 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1494 if (!lu_gp_id) 1495 goto again; 1496 1497 pr_warn("ALUA Logical Unit Group ID: %hu" 1498 " already exists, ignoring request\n", 1499 lu_gp_id); 1500 spin_unlock(&lu_gps_lock); 1501 return -EINVAL; 1502 } 1503 } 1504 1505 lu_gp->lu_gp_id = lu_gp_id_tmp; 1506 lu_gp->lu_gp_valid_id = 1; 1507 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1508 alua_lu_gps_count++; 1509 spin_unlock(&lu_gps_lock); 1510 1511 return 0; 1512 } 1513 1514 static struct t10_alua_lu_gp_member * 1515 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1516 { 1517 struct t10_alua_lu_gp_member *lu_gp_mem; 1518 1519 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1520 if (!lu_gp_mem) { 1521 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1522 return ERR_PTR(-ENOMEM); 1523 } 1524 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1525 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1526 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1527 1528 lu_gp_mem->lu_gp_mem_dev = dev; 1529 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1530 1531 return lu_gp_mem; 1532 } 1533 1534 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1535 { 1536 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1537 /* 1538 * Once we have reached this point, config_item_put() has 1539 * already been called from target_core_alua_drop_lu_gp(). 1540 * 1541 * Here, we remove the *lu_gp from the global list so that 1542 * no associations can be made while we are releasing 1543 * struct t10_alua_lu_gp. 1544 */ 1545 spin_lock(&lu_gps_lock); 1546 list_del(&lu_gp->lu_gp_node); 1547 alua_lu_gps_count--; 1548 spin_unlock(&lu_gps_lock); 1549 /* 1550 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1551 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1552 * released with core_alua_put_lu_gp_from_name() 1553 */ 1554 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1555 cpu_relax(); 1556 /* 1557 * Release reference to struct t10_alua_lu_gp * from all associated 1558 * struct se_device. 1559 */ 1560 spin_lock(&lu_gp->lu_gp_lock); 1561 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1562 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1563 if (lu_gp_mem->lu_gp_assoc) { 1564 list_del(&lu_gp_mem->lu_gp_mem_list); 1565 lu_gp->lu_gp_members--; 1566 lu_gp_mem->lu_gp_assoc = 0; 1567 } 1568 spin_unlock(&lu_gp->lu_gp_lock); 1569 /* 1570 * 1571 * lu_gp_mem is associated with a single 1572 * struct se_device->dev_alua_lu_gp_mem, and is released when 1573 * struct se_device is released via core_alua_free_lu_gp_mem(). 1574 * 1575 * If the passed lu_gp does NOT match the default_lu_gp, assume 1576 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1577 */ 1578 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1579 if (lu_gp != default_lu_gp) 1580 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1581 default_lu_gp); 1582 else 1583 lu_gp_mem->lu_gp = NULL; 1584 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1585 1586 spin_lock(&lu_gp->lu_gp_lock); 1587 } 1588 spin_unlock(&lu_gp->lu_gp_lock); 1589 1590 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1591 } 1592 1593 void core_alua_free_lu_gp_mem(struct se_device *dev) 1594 { 1595 struct t10_alua_lu_gp *lu_gp; 1596 struct t10_alua_lu_gp_member *lu_gp_mem; 1597 1598 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1599 if (!lu_gp_mem) 1600 return; 1601 1602 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1603 cpu_relax(); 1604 1605 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1606 lu_gp = lu_gp_mem->lu_gp; 1607 if (lu_gp) { 1608 spin_lock(&lu_gp->lu_gp_lock); 1609 if (lu_gp_mem->lu_gp_assoc) { 1610 list_del(&lu_gp_mem->lu_gp_mem_list); 1611 lu_gp->lu_gp_members--; 1612 lu_gp_mem->lu_gp_assoc = 0; 1613 } 1614 spin_unlock(&lu_gp->lu_gp_lock); 1615 lu_gp_mem->lu_gp = NULL; 1616 } 1617 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1618 1619 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1620 } 1621 1622 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1623 { 1624 struct t10_alua_lu_gp *lu_gp; 1625 struct config_item *ci; 1626 1627 spin_lock(&lu_gps_lock); 1628 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1629 if (!lu_gp->lu_gp_valid_id) 1630 continue; 1631 ci = &lu_gp->lu_gp_group.cg_item; 1632 if (!strcmp(config_item_name(ci), name)) { 1633 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1634 spin_unlock(&lu_gps_lock); 1635 return lu_gp; 1636 } 1637 } 1638 spin_unlock(&lu_gps_lock); 1639 1640 return NULL; 1641 } 1642 1643 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1644 { 1645 spin_lock(&lu_gps_lock); 1646 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1647 spin_unlock(&lu_gps_lock); 1648 } 1649 1650 /* 1651 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1652 */ 1653 void __core_alua_attach_lu_gp_mem( 1654 struct t10_alua_lu_gp_member *lu_gp_mem, 1655 struct t10_alua_lu_gp *lu_gp) 1656 { 1657 spin_lock(&lu_gp->lu_gp_lock); 1658 lu_gp_mem->lu_gp = lu_gp; 1659 lu_gp_mem->lu_gp_assoc = 1; 1660 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1661 lu_gp->lu_gp_members++; 1662 spin_unlock(&lu_gp->lu_gp_lock); 1663 } 1664 1665 /* 1666 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1667 */ 1668 void __core_alua_drop_lu_gp_mem( 1669 struct t10_alua_lu_gp_member *lu_gp_mem, 1670 struct t10_alua_lu_gp *lu_gp) 1671 { 1672 spin_lock(&lu_gp->lu_gp_lock); 1673 list_del(&lu_gp_mem->lu_gp_mem_list); 1674 lu_gp_mem->lu_gp = NULL; 1675 lu_gp_mem->lu_gp_assoc = 0; 1676 lu_gp->lu_gp_members--; 1677 spin_unlock(&lu_gp->lu_gp_lock); 1678 } 1679 1680 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1681 const char *name, int def_group) 1682 { 1683 struct t10_alua_tg_pt_gp *tg_pt_gp; 1684 1685 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1686 if (!tg_pt_gp) { 1687 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1688 return NULL; 1689 } 1690 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1691 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1692 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1693 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1694 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1695 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1696 core_alua_do_transition_tg_pt_work); 1697 tg_pt_gp->tg_pt_gp_dev = dev; 1698 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1699 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1700 /* 1701 * Enable both explicit and implicit ALUA support by default 1702 */ 1703 tg_pt_gp->tg_pt_gp_alua_access_type = 1704 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1705 /* 1706 * Set the default Active/NonOptimized Delay in milliseconds 1707 */ 1708 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1709 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1710 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1711 1712 /* 1713 * Enable all supported states 1714 */ 1715 tg_pt_gp->tg_pt_gp_alua_supported_states = 1716 ALUA_T_SUP | ALUA_O_SUP | 1717 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1718 1719 if (def_group) { 1720 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1721 tg_pt_gp->tg_pt_gp_id = 1722 dev->t10_alua.alua_tg_pt_gps_counter++; 1723 tg_pt_gp->tg_pt_gp_valid_id = 1; 1724 dev->t10_alua.alua_tg_pt_gps_count++; 1725 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1726 &dev->t10_alua.tg_pt_gps_list); 1727 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1728 } 1729 1730 return tg_pt_gp; 1731 } 1732 1733 int core_alua_set_tg_pt_gp_id( 1734 struct t10_alua_tg_pt_gp *tg_pt_gp, 1735 u16 tg_pt_gp_id) 1736 { 1737 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1738 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1739 u16 tg_pt_gp_id_tmp; 1740 1741 /* 1742 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1743 */ 1744 if (tg_pt_gp->tg_pt_gp_valid_id) { 1745 pr_warn("ALUA TG PT Group already has a valid ID," 1746 " ignoring request\n"); 1747 return -EINVAL; 1748 } 1749 1750 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1751 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1752 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1753 " 0x0000ffff reached\n"); 1754 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1755 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1756 return -ENOSPC; 1757 } 1758 again: 1759 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1760 dev->t10_alua.alua_tg_pt_gps_counter++; 1761 1762 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1763 tg_pt_gp_list) { 1764 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1765 if (!tg_pt_gp_id) 1766 goto again; 1767 1768 pr_err("ALUA Target Port Group ID: %hu already" 1769 " exists, ignoring request\n", tg_pt_gp_id); 1770 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1771 return -EINVAL; 1772 } 1773 } 1774 1775 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1776 tg_pt_gp->tg_pt_gp_valid_id = 1; 1777 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1778 &dev->t10_alua.tg_pt_gps_list); 1779 dev->t10_alua.alua_tg_pt_gps_count++; 1780 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1781 1782 return 0; 1783 } 1784 1785 void core_alua_free_tg_pt_gp( 1786 struct t10_alua_tg_pt_gp *tg_pt_gp) 1787 { 1788 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1789 struct se_lun *lun, *next; 1790 1791 /* 1792 * Once we have reached this point, config_item_put() has already 1793 * been called from target_core_alua_drop_tg_pt_gp(). 1794 * 1795 * Here we remove *tg_pt_gp from the global list so that 1796 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1797 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1798 */ 1799 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1800 list_del(&tg_pt_gp->tg_pt_gp_list); 1801 dev->t10_alua.alua_tg_pt_gps_counter--; 1802 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1803 1804 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1805 1806 /* 1807 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1808 * core_alua_get_tg_pt_gp_by_name() in 1809 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1810 * to be released with core_alua_put_tg_pt_gp_from_name(). 1811 */ 1812 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1813 cpu_relax(); 1814 1815 /* 1816 * Release reference to struct t10_alua_tg_pt_gp from all associated 1817 * struct se_port. 1818 */ 1819 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1820 list_for_each_entry_safe(lun, next, 1821 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1822 list_del_init(&lun->lun_tg_pt_gp_link); 1823 tg_pt_gp->tg_pt_gp_members--; 1824 1825 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1826 /* 1827 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1828 * assume we want to re-associate a given tg_pt_gp_mem with 1829 * default_tg_pt_gp. 1830 */ 1831 spin_lock(&lun->lun_tg_pt_gp_lock); 1832 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1833 __target_attach_tg_pt_gp(lun, 1834 dev->t10_alua.default_tg_pt_gp); 1835 } else 1836 lun->lun_tg_pt_gp = NULL; 1837 spin_unlock(&lun->lun_tg_pt_gp_lock); 1838 1839 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1840 } 1841 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1842 1843 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1844 } 1845 1846 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1847 struct se_device *dev, const char *name) 1848 { 1849 struct t10_alua_tg_pt_gp *tg_pt_gp; 1850 struct config_item *ci; 1851 1852 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1853 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1854 tg_pt_gp_list) { 1855 if (!tg_pt_gp->tg_pt_gp_valid_id) 1856 continue; 1857 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1858 if (!strcmp(config_item_name(ci), name)) { 1859 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1860 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1861 return tg_pt_gp; 1862 } 1863 } 1864 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1865 1866 return NULL; 1867 } 1868 1869 static void core_alua_put_tg_pt_gp_from_name( 1870 struct t10_alua_tg_pt_gp *tg_pt_gp) 1871 { 1872 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1873 1874 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1875 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1876 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1877 } 1878 1879 static void __target_attach_tg_pt_gp(struct se_lun *lun, 1880 struct t10_alua_tg_pt_gp *tg_pt_gp) 1881 { 1882 struct se_dev_entry *se_deve; 1883 1884 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1885 1886 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1887 lun->lun_tg_pt_gp = tg_pt_gp; 1888 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1889 tg_pt_gp->tg_pt_gp_members++; 1890 spin_lock(&lun->lun_deve_lock); 1891 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1892 core_scsi3_ua_allocate(se_deve, 0x3f, 1893 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1894 spin_unlock(&lun->lun_deve_lock); 1895 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1896 } 1897 1898 void target_attach_tg_pt_gp(struct se_lun *lun, 1899 struct t10_alua_tg_pt_gp *tg_pt_gp) 1900 { 1901 spin_lock(&lun->lun_tg_pt_gp_lock); 1902 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1903 spin_unlock(&lun->lun_tg_pt_gp_lock); 1904 } 1905 1906 static void __target_detach_tg_pt_gp(struct se_lun *lun, 1907 struct t10_alua_tg_pt_gp *tg_pt_gp) 1908 { 1909 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1910 1911 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1912 list_del_init(&lun->lun_tg_pt_gp_link); 1913 tg_pt_gp->tg_pt_gp_members--; 1914 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1915 1916 lun->lun_tg_pt_gp = NULL; 1917 } 1918 1919 void target_detach_tg_pt_gp(struct se_lun *lun) 1920 { 1921 struct t10_alua_tg_pt_gp *tg_pt_gp; 1922 1923 spin_lock(&lun->lun_tg_pt_gp_lock); 1924 tg_pt_gp = lun->lun_tg_pt_gp; 1925 if (tg_pt_gp) 1926 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1927 spin_unlock(&lun->lun_tg_pt_gp_lock); 1928 } 1929 1930 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1931 { 1932 struct config_item *tg_pt_ci; 1933 struct t10_alua_tg_pt_gp *tg_pt_gp; 1934 ssize_t len = 0; 1935 1936 spin_lock(&lun->lun_tg_pt_gp_lock); 1937 tg_pt_gp = lun->lun_tg_pt_gp; 1938 if (tg_pt_gp) { 1939 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1940 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1941 " %hu\nTG Port Primary Access State: %s\nTG Port " 1942 "Primary Access Status: %s\nTG Port Secondary Access" 1943 " State: %s\nTG Port Secondary Access Status: %s\n", 1944 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1945 core_alua_dump_state(atomic_read( 1946 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1947 core_alua_dump_status( 1948 tg_pt_gp->tg_pt_gp_alua_access_status), 1949 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1950 "Offline" : "None", 1951 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1952 } 1953 spin_unlock(&lun->lun_tg_pt_gp_lock); 1954 1955 return len; 1956 } 1957 1958 ssize_t core_alua_store_tg_pt_gp_info( 1959 struct se_lun *lun, 1960 const char *page, 1961 size_t count) 1962 { 1963 struct se_portal_group *tpg = lun->lun_tpg; 1964 /* 1965 * rcu_dereference_raw protected by se_lun->lun_group symlink 1966 * reference to se_device->dev_group. 1967 */ 1968 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1969 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1970 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1971 int move = 0; 1972 1973 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH || 1974 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1975 return -ENODEV; 1976 1977 if (count > TG_PT_GROUP_NAME_BUF) { 1978 pr_err("ALUA Target Port Group alias too large!\n"); 1979 return -EINVAL; 1980 } 1981 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1982 memcpy(buf, page, count); 1983 /* 1984 * Any ALUA target port group alias besides "NULL" means we will be 1985 * making a new group association. 1986 */ 1987 if (strcmp(strstrip(buf), "NULL")) { 1988 /* 1989 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1990 * struct t10_alua_tg_pt_gp. This reference is released with 1991 * core_alua_put_tg_pt_gp_from_name() below. 1992 */ 1993 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1994 strstrip(buf)); 1995 if (!tg_pt_gp_new) 1996 return -ENODEV; 1997 } 1998 1999 spin_lock(&lun->lun_tg_pt_gp_lock); 2000 tg_pt_gp = lun->lun_tg_pt_gp; 2001 if (tg_pt_gp) { 2002 /* 2003 * Clearing an existing tg_pt_gp association, and replacing 2004 * with the default_tg_pt_gp. 2005 */ 2006 if (!tg_pt_gp_new) { 2007 pr_debug("Target_Core_ConfigFS: Moving" 2008 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2009 " alua/%s, ID: %hu back to" 2010 " default_tg_pt_gp\n", 2011 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2012 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2013 config_item_name(&lun->lun_group.cg_item), 2014 config_item_name( 2015 &tg_pt_gp->tg_pt_gp_group.cg_item), 2016 tg_pt_gp->tg_pt_gp_id); 2017 2018 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2019 __target_attach_tg_pt_gp(lun, 2020 dev->t10_alua.default_tg_pt_gp); 2021 spin_unlock(&lun->lun_tg_pt_gp_lock); 2022 2023 return count; 2024 } 2025 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2026 move = 1; 2027 } 2028 2029 __target_attach_tg_pt_gp(lun, tg_pt_gp_new); 2030 spin_unlock(&lun->lun_tg_pt_gp_lock); 2031 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2032 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2033 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2034 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2035 config_item_name(&lun->lun_group.cg_item), 2036 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2037 tg_pt_gp_new->tg_pt_gp_id); 2038 2039 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2040 return count; 2041 } 2042 2043 ssize_t core_alua_show_access_type( 2044 struct t10_alua_tg_pt_gp *tg_pt_gp, 2045 char *page) 2046 { 2047 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2048 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2049 return sprintf(page, "Implicit and Explicit\n"); 2050 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2051 return sprintf(page, "Implicit\n"); 2052 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2053 return sprintf(page, "Explicit\n"); 2054 else 2055 return sprintf(page, "None\n"); 2056 } 2057 2058 ssize_t core_alua_store_access_type( 2059 struct t10_alua_tg_pt_gp *tg_pt_gp, 2060 const char *page, 2061 size_t count) 2062 { 2063 unsigned long tmp; 2064 int ret; 2065 2066 ret = kstrtoul(page, 0, &tmp); 2067 if (ret < 0) { 2068 pr_err("Unable to extract alua_access_type\n"); 2069 return ret; 2070 } 2071 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2072 pr_err("Illegal value for alua_access_type:" 2073 " %lu\n", tmp); 2074 return -EINVAL; 2075 } 2076 if (tmp == 3) 2077 tg_pt_gp->tg_pt_gp_alua_access_type = 2078 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2079 else if (tmp == 2) 2080 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2081 else if (tmp == 1) 2082 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2083 else 2084 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2085 2086 return count; 2087 } 2088 2089 ssize_t core_alua_show_nonop_delay_msecs( 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_nonop_delay_msecs); 2094 } 2095 2096 ssize_t core_alua_store_nonop_delay_msecs( 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 nonop_delay_msecs\n"); 2107 return ret; 2108 } 2109 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2110 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2111 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2112 ALUA_MAX_NONOP_DELAY_MSECS); 2113 return -EINVAL; 2114 } 2115 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2116 2117 return count; 2118 } 2119 2120 ssize_t core_alua_show_trans_delay_msecs( 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_trans_delay_msecs); 2125 } 2126 2127 ssize_t core_alua_store_trans_delay_msecs( 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 trans_delay_msecs\n"); 2138 return ret; 2139 } 2140 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2141 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2142 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2143 ALUA_MAX_TRANS_DELAY_MSECS); 2144 return -EINVAL; 2145 } 2146 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2147 2148 return count; 2149 } 2150 2151 ssize_t core_alua_show_implicit_trans_secs( 2152 struct t10_alua_tg_pt_gp *tg_pt_gp, 2153 char *page) 2154 { 2155 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2156 } 2157 2158 ssize_t core_alua_store_implicit_trans_secs( 2159 struct t10_alua_tg_pt_gp *tg_pt_gp, 2160 const char *page, 2161 size_t count) 2162 { 2163 unsigned long tmp; 2164 int ret; 2165 2166 ret = kstrtoul(page, 0, &tmp); 2167 if (ret < 0) { 2168 pr_err("Unable to extract implicit_trans_secs\n"); 2169 return ret; 2170 } 2171 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2172 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2173 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2174 ALUA_MAX_IMPLICIT_TRANS_SECS); 2175 return -EINVAL; 2176 } 2177 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2178 2179 return count; 2180 } 2181 2182 ssize_t core_alua_show_preferred_bit( 2183 struct t10_alua_tg_pt_gp *tg_pt_gp, 2184 char *page) 2185 { 2186 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2187 } 2188 2189 ssize_t core_alua_store_preferred_bit( 2190 struct t10_alua_tg_pt_gp *tg_pt_gp, 2191 const char *page, 2192 size_t count) 2193 { 2194 unsigned long tmp; 2195 int ret; 2196 2197 ret = kstrtoul(page, 0, &tmp); 2198 if (ret < 0) { 2199 pr_err("Unable to extract preferred ALUA value\n"); 2200 return ret; 2201 } 2202 if ((tmp != 0) && (tmp != 1)) { 2203 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2204 return -EINVAL; 2205 } 2206 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2207 2208 return count; 2209 } 2210 2211 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2212 { 2213 return sprintf(page, "%d\n", 2214 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2215 } 2216 2217 ssize_t core_alua_store_offline_bit( 2218 struct se_lun *lun, 2219 const char *page, 2220 size_t count) 2221 { 2222 /* 2223 * rcu_dereference_raw protected by se_lun->lun_group symlink 2224 * reference to se_device->dev_group. 2225 */ 2226 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2227 unsigned long tmp; 2228 int ret; 2229 2230 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH || 2231 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2232 return -ENODEV; 2233 2234 ret = kstrtoul(page, 0, &tmp); 2235 if (ret < 0) { 2236 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2237 return ret; 2238 } 2239 if ((tmp != 0) && (tmp != 1)) { 2240 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2241 tmp); 2242 return -EINVAL; 2243 } 2244 2245 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2246 if (ret < 0) 2247 return -EINVAL; 2248 2249 return count; 2250 } 2251 2252 ssize_t core_alua_show_secondary_status( 2253 struct se_lun *lun, 2254 char *page) 2255 { 2256 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2257 } 2258 2259 ssize_t core_alua_store_secondary_status( 2260 struct se_lun *lun, 2261 const char *page, 2262 size_t count) 2263 { 2264 unsigned long tmp; 2265 int ret; 2266 2267 ret = kstrtoul(page, 0, &tmp); 2268 if (ret < 0) { 2269 pr_err("Unable to extract alua_tg_pt_status\n"); 2270 return ret; 2271 } 2272 if ((tmp != ALUA_STATUS_NONE) && 2273 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2274 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2275 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2276 tmp); 2277 return -EINVAL; 2278 } 2279 lun->lun_tg_pt_secondary_stat = (int)tmp; 2280 2281 return count; 2282 } 2283 2284 ssize_t core_alua_show_secondary_write_metadata( 2285 struct se_lun *lun, 2286 char *page) 2287 { 2288 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2289 } 2290 2291 ssize_t core_alua_store_secondary_write_metadata( 2292 struct se_lun *lun, 2293 const char *page, 2294 size_t count) 2295 { 2296 unsigned long tmp; 2297 int ret; 2298 2299 ret = kstrtoul(page, 0, &tmp); 2300 if (ret < 0) { 2301 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2302 return ret; 2303 } 2304 if ((tmp != 0) && (tmp != 1)) { 2305 pr_err("Illegal value for alua_tg_pt_write_md:" 2306 " %lu\n", tmp); 2307 return -EINVAL; 2308 } 2309 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2310 2311 return count; 2312 } 2313 2314 int core_setup_alua(struct se_device *dev) 2315 { 2316 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && 2317 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2318 struct t10_alua_lu_gp_member *lu_gp_mem; 2319 2320 /* 2321 * Associate this struct se_device with the default ALUA 2322 * LUN Group. 2323 */ 2324 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2325 if (IS_ERR(lu_gp_mem)) 2326 return PTR_ERR(lu_gp_mem); 2327 2328 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2329 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2330 default_lu_gp); 2331 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2332 2333 pr_debug("%s: Adding to default ALUA LU Group:" 2334 " core/alua/lu_gps/default_lu_gp\n", 2335 dev->transport->name); 2336 } 2337 2338 return 0; 2339 } 2340