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/delay.h> 30 #include <linux/export.h> 31 #include <linux/fcntl.h> 32 #include <linux/file.h> 33 #include <linux/fs.h> 34 #include <scsi/scsi_proto.h> 35 #include <asm/unaligned.h> 36 37 #include <target/target_core_base.h> 38 #include <target/target_core_backend.h> 39 #include <target/target_core_fabric.h> 40 41 #include "target_core_internal.h" 42 #include "target_core_alua.h" 43 #include "target_core_ua.h" 44 45 static sense_reason_t core_alua_check_transition(int state, int valid, 46 int *primary); 47 static int core_alua_set_tg_pt_secondary_state( 48 struct se_lun *lun, int explicit, int offline); 49 50 static char *core_alua_dump_state(int state); 51 52 static void __target_attach_tg_pt_gp(struct se_lun *lun, 53 struct t10_alua_tg_pt_gp *tg_pt_gp); 54 55 static u16 alua_lu_gps_counter; 56 static u32 alua_lu_gps_count; 57 58 static DEFINE_SPINLOCK(lu_gps_lock); 59 static LIST_HEAD(lu_gps_list); 60 61 struct t10_alua_lu_gp *default_lu_gp; 62 63 /* 64 * REPORT REFERRALS 65 * 66 * See sbc3r35 section 5.23 67 */ 68 sense_reason_t 69 target_emulate_report_referrals(struct se_cmd *cmd) 70 { 71 struct se_device *dev = cmd->se_dev; 72 struct t10_alua_lba_map *map; 73 struct t10_alua_lba_map_member *map_mem; 74 unsigned char *buf; 75 u32 rd_len = 0, off; 76 77 if (cmd->data_length < 4) { 78 pr_warn("REPORT REFERRALS allocation length %u too" 79 " small\n", cmd->data_length); 80 return TCM_INVALID_CDB_FIELD; 81 } 82 83 buf = transport_kmap_data_sg(cmd); 84 if (!buf) 85 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 86 87 off = 4; 88 spin_lock(&dev->t10_alua.lba_map_lock); 89 if (list_empty(&dev->t10_alua.lba_map_list)) { 90 spin_unlock(&dev->t10_alua.lba_map_lock); 91 transport_kunmap_data_sg(cmd); 92 93 return TCM_UNSUPPORTED_SCSI_OPCODE; 94 } 95 96 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 97 lba_map_list) { 98 int desc_num = off + 3; 99 int pg_num; 100 101 off += 4; 102 if (cmd->data_length > off) 103 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 104 off += 8; 105 if (cmd->data_length > off) 106 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 107 off += 8; 108 rd_len += 20; 109 pg_num = 0; 110 list_for_each_entry(map_mem, &map->lba_map_mem_list, 111 lba_map_mem_list) { 112 int alua_state = map_mem->lba_map_mem_alua_state; 113 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 114 115 if (cmd->data_length > off) 116 buf[off] = alua_state & 0x0f; 117 off += 2; 118 if (cmd->data_length > off) 119 buf[off] = (alua_pg_id >> 8) & 0xff; 120 off++; 121 if (cmd->data_length > off) 122 buf[off] = (alua_pg_id & 0xff); 123 off++; 124 rd_len += 4; 125 pg_num++; 126 } 127 if (cmd->data_length > desc_num) 128 buf[desc_num] = pg_num; 129 } 130 spin_unlock(&dev->t10_alua.lba_map_lock); 131 132 /* 133 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 134 */ 135 put_unaligned_be16(rd_len, &buf[2]); 136 137 transport_kunmap_data_sg(cmd); 138 139 target_complete_cmd(cmd, GOOD); 140 return 0; 141 } 142 143 /* 144 * REPORT_TARGET_PORT_GROUPS 145 * 146 * See spc4r17 section 6.27 147 */ 148 sense_reason_t 149 target_emulate_report_target_port_groups(struct se_cmd *cmd) 150 { 151 struct se_device *dev = cmd->se_dev; 152 struct t10_alua_tg_pt_gp *tg_pt_gp; 153 struct se_lun *lun; 154 unsigned char *buf; 155 u32 rd_len = 0, off; 156 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 157 158 /* 159 * Skip over RESERVED area to first Target port group descriptor 160 * depending on the PARAMETER DATA FORMAT type.. 161 */ 162 if (ext_hdr != 0) 163 off = 8; 164 else 165 off = 4; 166 167 if (cmd->data_length < off) { 168 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 169 " small for %s header\n", cmd->data_length, 170 (ext_hdr) ? "extended" : "normal"); 171 return TCM_INVALID_CDB_FIELD; 172 } 173 buf = transport_kmap_data_sg(cmd); 174 if (!buf) 175 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 176 177 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 178 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 179 tg_pt_gp_list) { 180 /* 181 * Check if the Target port group and Target port descriptor list 182 * based on tg_pt_gp_members count will fit into the response payload. 183 * Otherwise, bump rd_len to let the initiator know we have exceeded 184 * the allocation length and the response is truncated. 185 */ 186 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 187 cmd->data_length) { 188 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 189 continue; 190 } 191 /* 192 * PREF: Preferred target port bit, determine if this 193 * bit should be set for port group. 194 */ 195 if (tg_pt_gp->tg_pt_gp_pref) 196 buf[off] = 0x80; 197 /* 198 * Set the ASYMMETRIC ACCESS State 199 */ 200 buf[off++] |= (atomic_read( 201 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 202 /* 203 * Set supported ASYMMETRIC ACCESS State bits 204 */ 205 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 206 /* 207 * TARGET PORT GROUP 208 */ 209 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 210 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 211 212 off++; /* Skip over Reserved */ 213 /* 214 * STATUS CODE 215 */ 216 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 217 /* 218 * Vendor Specific field 219 */ 220 buf[off++] = 0x00; 221 /* 222 * TARGET PORT COUNT 223 */ 224 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 225 rd_len += 8; 226 227 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 228 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 229 lun_tg_pt_gp_link) { 230 /* 231 * Start Target Port descriptor format 232 * 233 * See spc4r17 section 6.2.7 Table 247 234 */ 235 off += 2; /* Skip over Obsolete */ 236 /* 237 * Set RELATIVE TARGET PORT IDENTIFIER 238 */ 239 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff); 240 buf[off++] = (lun->lun_rtpi & 0xff); 241 rd_len += 4; 242 } 243 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 244 } 245 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 246 /* 247 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 248 */ 249 put_unaligned_be32(rd_len, &buf[0]); 250 251 /* 252 * Fill in the Extended header parameter data format if requested 253 */ 254 if (ext_hdr != 0) { 255 buf[4] = 0x10; 256 /* 257 * Set the implicit transition time (in seconds) for the application 258 * client to use as a base for it's transition timeout value. 259 * 260 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 261 * this CDB was received upon to determine this value individually 262 * for ALUA target port group. 263 */ 264 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock); 265 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp; 266 if (tg_pt_gp) 267 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 268 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock); 269 } 270 transport_kunmap_data_sg(cmd); 271 272 target_complete_cmd(cmd, GOOD); 273 return 0; 274 } 275 276 /* 277 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 278 * 279 * See spc4r17 section 6.35 280 */ 281 sense_reason_t 282 target_emulate_set_target_port_groups(struct se_cmd *cmd) 283 { 284 struct se_device *dev = cmd->se_dev; 285 struct se_lun *l_lun = cmd->se_lun; 286 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 287 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 288 unsigned char *buf; 289 unsigned char *ptr; 290 sense_reason_t rc = TCM_NO_SENSE; 291 u32 len = 4; /* Skip over RESERVED area in header */ 292 int alua_access_state, primary = 0, valid_states; 293 u16 tg_pt_id, rtpi; 294 295 if (cmd->data_length < 4) { 296 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 297 " small\n", cmd->data_length); 298 return TCM_INVALID_PARAMETER_LIST; 299 } 300 301 buf = transport_kmap_data_sg(cmd); 302 if (!buf) 303 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 304 305 /* 306 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 307 * for the local tg_pt_gp. 308 */ 309 spin_lock(&l_lun->lun_tg_pt_gp_lock); 310 l_tg_pt_gp = l_lun->lun_tg_pt_gp; 311 if (!l_tg_pt_gp) { 312 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 313 pr_err("Unable to access l_lun->tg_pt_gp\n"); 314 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 315 goto out; 316 } 317 318 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 319 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 320 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 321 " while TPGS_EXPLICIT_ALUA is disabled\n"); 322 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 323 goto out; 324 } 325 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 326 spin_unlock(&l_lun->lun_tg_pt_gp_lock); 327 328 ptr = &buf[4]; /* Skip over RESERVED area in header */ 329 330 while (len < cmd->data_length) { 331 bool found = false; 332 alua_access_state = (ptr[0] & 0x0f); 333 /* 334 * Check the received ALUA access state, and determine if 335 * the state is a primary or secondary target port asymmetric 336 * access state. 337 */ 338 rc = core_alua_check_transition(alua_access_state, 339 valid_states, &primary); 340 if (rc) { 341 /* 342 * If the SET TARGET PORT GROUPS attempts to establish 343 * an invalid combination of target port asymmetric 344 * access states or attempts to establish an 345 * unsupported target port asymmetric access state, 346 * then the command shall be terminated with CHECK 347 * CONDITION status, with the sense key set to ILLEGAL 348 * REQUEST, and the additional sense code set to INVALID 349 * FIELD IN PARAMETER LIST. 350 */ 351 goto out; 352 } 353 354 /* 355 * If the ASYMMETRIC ACCESS STATE field (see table 267) 356 * specifies a primary target port asymmetric access state, 357 * then the TARGET PORT GROUP OR TARGET PORT field specifies 358 * a primary target port group for which the primary target 359 * port asymmetric access state shall be changed. If the 360 * ASYMMETRIC ACCESS STATE field specifies a secondary target 361 * port asymmetric access state, then the TARGET PORT GROUP OR 362 * TARGET PORT field specifies the relative target port 363 * identifier (see 3.1.120) of the target port for which the 364 * secondary target port asymmetric access state shall be 365 * changed. 366 */ 367 if (primary) { 368 tg_pt_id = get_unaligned_be16(ptr + 2); 369 /* 370 * Locate the matching target port group ID from 371 * the global tg_pt_gp list 372 */ 373 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 374 list_for_each_entry(tg_pt_gp, 375 &dev->t10_alua.tg_pt_gps_list, 376 tg_pt_gp_list) { 377 if (!tg_pt_gp->tg_pt_gp_valid_id) 378 continue; 379 380 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 381 continue; 382 383 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 384 385 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 386 387 if (!core_alua_do_port_transition(tg_pt_gp, 388 dev, l_lun, nacl, 389 alua_access_state, 1)) 390 found = true; 391 392 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 393 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 394 break; 395 } 396 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 397 } else { 398 struct se_lun *lun; 399 400 /* 401 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 402 * the Target Port in question for the the incoming 403 * SET_TARGET_PORT_GROUPS op. 404 */ 405 rtpi = get_unaligned_be16(ptr + 2); 406 /* 407 * Locate the matching relative target port identifier 408 * for the struct se_device storage object. 409 */ 410 spin_lock(&dev->se_port_lock); 411 list_for_each_entry(lun, &dev->dev_sep_list, 412 lun_dev_link) { 413 if (lun->lun_rtpi != rtpi) 414 continue; 415 416 // XXX: racy unlock 417 spin_unlock(&dev->se_port_lock); 418 419 if (!core_alua_set_tg_pt_secondary_state( 420 lun, 1, 1)) 421 found = true; 422 423 spin_lock(&dev->se_port_lock); 424 break; 425 } 426 spin_unlock(&dev->se_port_lock); 427 } 428 429 if (!found) { 430 rc = TCM_INVALID_PARAMETER_LIST; 431 goto out; 432 } 433 434 ptr += 4; 435 len += 4; 436 } 437 438 out: 439 transport_kunmap_data_sg(cmd); 440 if (!rc) 441 target_complete_cmd(cmd, GOOD); 442 return rc; 443 } 444 445 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq) 446 { 447 /* 448 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 449 * The ALUA additional sense code qualifier (ASCQ) is determined 450 * by the ALUA primary or secondary access state.. 451 */ 452 pr_debug("[%s]: ALUA TG Port not available, " 453 "SenseKey: NOT_READY, ASC/ASCQ: " 454 "0x04/0x%02x\n", 455 cmd->se_tfo->get_fabric_name(), alua_ascq); 456 457 cmd->scsi_asc = 0x04; 458 cmd->scsi_ascq = alua_ascq; 459 } 460 461 static inline void core_alua_state_nonoptimized( 462 struct se_cmd *cmd, 463 unsigned char *cdb, 464 int nonop_delay_msecs) 465 { 466 /* 467 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 468 * later to determine if processing of this cmd needs to be 469 * temporarily delayed for the Active/NonOptimized primary access state. 470 */ 471 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 472 cmd->alua_nonop_delay = nonop_delay_msecs; 473 } 474 475 static inline int core_alua_state_lba_dependent( 476 struct se_cmd *cmd, 477 struct t10_alua_tg_pt_gp *tg_pt_gp) 478 { 479 struct se_device *dev = cmd->se_dev; 480 u64 segment_size, segment_mult, sectors, lba; 481 482 /* Only need to check for cdb actually containing LBAs */ 483 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 484 return 0; 485 486 spin_lock(&dev->t10_alua.lba_map_lock); 487 segment_size = dev->t10_alua.lba_map_segment_size; 488 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 489 sectors = cmd->data_length / dev->dev_attrib.block_size; 490 491 lba = cmd->t_task_lba; 492 while (lba < cmd->t_task_lba + sectors) { 493 struct t10_alua_lba_map *cur_map = NULL, *map; 494 struct t10_alua_lba_map_member *map_mem; 495 496 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 497 lba_map_list) { 498 u64 start_lba, last_lba; 499 u64 first_lba = map->lba_map_first_lba; 500 501 if (segment_mult) { 502 u64 tmp = lba; 503 start_lba = do_div(tmp, segment_size * segment_mult); 504 505 last_lba = first_lba + segment_size - 1; 506 if (start_lba >= first_lba && 507 start_lba <= last_lba) { 508 lba += segment_size; 509 cur_map = map; 510 break; 511 } 512 } else { 513 last_lba = map->lba_map_last_lba; 514 if (lba >= first_lba && lba <= last_lba) { 515 lba = last_lba + 1; 516 cur_map = map; 517 break; 518 } 519 } 520 } 521 if (!cur_map) { 522 spin_unlock(&dev->t10_alua.lba_map_lock); 523 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 524 return 1; 525 } 526 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 527 lba_map_mem_list) { 528 if (map_mem->lba_map_mem_alua_pg_id != 529 tg_pt_gp->tg_pt_gp_id) 530 continue; 531 switch(map_mem->lba_map_mem_alua_state) { 532 case ALUA_ACCESS_STATE_STANDBY: 533 spin_unlock(&dev->t10_alua.lba_map_lock); 534 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 535 return 1; 536 case ALUA_ACCESS_STATE_UNAVAILABLE: 537 spin_unlock(&dev->t10_alua.lba_map_lock); 538 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 539 return 1; 540 default: 541 break; 542 } 543 } 544 } 545 spin_unlock(&dev->t10_alua.lba_map_lock); 546 return 0; 547 } 548 549 static inline int core_alua_state_standby( 550 struct se_cmd *cmd, 551 unsigned char *cdb) 552 { 553 /* 554 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 555 * spc4r17 section 5.9.2.4.4 556 */ 557 switch (cdb[0]) { 558 case INQUIRY: 559 case LOG_SELECT: 560 case LOG_SENSE: 561 case MODE_SELECT: 562 case MODE_SENSE: 563 case REPORT_LUNS: 564 case RECEIVE_DIAGNOSTIC: 565 case SEND_DIAGNOSTIC: 566 case READ_CAPACITY: 567 return 0; 568 case SERVICE_ACTION_IN_16: 569 switch (cdb[1] & 0x1f) { 570 case SAI_READ_CAPACITY_16: 571 return 0; 572 default: 573 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 574 return 1; 575 } 576 case MAINTENANCE_IN: 577 switch (cdb[1] & 0x1f) { 578 case MI_REPORT_TARGET_PGS: 579 return 0; 580 default: 581 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 582 return 1; 583 } 584 case MAINTENANCE_OUT: 585 switch (cdb[1]) { 586 case MO_SET_TARGET_PGS: 587 return 0; 588 default: 589 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 590 return 1; 591 } 592 case REQUEST_SENSE: 593 case PERSISTENT_RESERVE_IN: 594 case PERSISTENT_RESERVE_OUT: 595 case READ_BUFFER: 596 case WRITE_BUFFER: 597 return 0; 598 default: 599 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 600 return 1; 601 } 602 603 return 0; 604 } 605 606 static inline int core_alua_state_unavailable( 607 struct se_cmd *cmd, 608 unsigned char *cdb) 609 { 610 /* 611 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 612 * spc4r17 section 5.9.2.4.5 613 */ 614 switch (cdb[0]) { 615 case INQUIRY: 616 case REPORT_LUNS: 617 return 0; 618 case MAINTENANCE_IN: 619 switch (cdb[1] & 0x1f) { 620 case MI_REPORT_TARGET_PGS: 621 return 0; 622 default: 623 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 624 return 1; 625 } 626 case MAINTENANCE_OUT: 627 switch (cdb[1]) { 628 case MO_SET_TARGET_PGS: 629 return 0; 630 default: 631 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 632 return 1; 633 } 634 case REQUEST_SENSE: 635 case READ_BUFFER: 636 case WRITE_BUFFER: 637 return 0; 638 default: 639 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 640 return 1; 641 } 642 643 return 0; 644 } 645 646 static inline int core_alua_state_transition( 647 struct se_cmd *cmd, 648 unsigned char *cdb) 649 { 650 /* 651 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 652 * spc4r17 section 5.9.2.5 653 */ 654 switch (cdb[0]) { 655 case INQUIRY: 656 case REPORT_LUNS: 657 return 0; 658 case MAINTENANCE_IN: 659 switch (cdb[1] & 0x1f) { 660 case MI_REPORT_TARGET_PGS: 661 return 0; 662 default: 663 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 664 return 1; 665 } 666 case REQUEST_SENSE: 667 case READ_BUFFER: 668 case WRITE_BUFFER: 669 return 0; 670 default: 671 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 672 return 1; 673 } 674 675 return 0; 676 } 677 678 /* 679 * return 1: Is used to signal LUN not accessible, and check condition/not ready 680 * return 0: Used to signal success 681 * return -1: Used to signal failure, and invalid cdb field 682 */ 683 sense_reason_t 684 target_alua_state_check(struct se_cmd *cmd) 685 { 686 struct se_device *dev = cmd->se_dev; 687 unsigned char *cdb = cmd->t_task_cdb; 688 struct se_lun *lun = cmd->se_lun; 689 struct t10_alua_tg_pt_gp *tg_pt_gp; 690 int out_alua_state, nonop_delay_msecs; 691 692 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 693 return 0; 694 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 695 return 0; 696 697 /* 698 * First, check for a struct se_port specific secondary ALUA target port 699 * access state: OFFLINE 700 */ 701 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) { 702 pr_debug("ALUA: Got secondary offline status for local" 703 " target port\n"); 704 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE); 705 return TCM_CHECK_CONDITION_NOT_READY; 706 } 707 708 if (!lun->lun_tg_pt_gp) 709 return 0; 710 711 spin_lock(&lun->lun_tg_pt_gp_lock); 712 tg_pt_gp = lun->lun_tg_pt_gp; 713 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 714 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 715 716 // XXX: keeps using tg_pt_gp witout reference after unlock 717 spin_unlock(&lun->lun_tg_pt_gp_lock); 718 /* 719 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 720 * statement so the compiler knows explicitly to check this case first. 721 * For the Optimized ALUA access state case, we want to process the 722 * incoming fabric cmd ASAP.. 723 */ 724 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 725 return 0; 726 727 switch (out_alua_state) { 728 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 729 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 730 break; 731 case ALUA_ACCESS_STATE_STANDBY: 732 if (core_alua_state_standby(cmd, cdb)) 733 return TCM_CHECK_CONDITION_NOT_READY; 734 break; 735 case ALUA_ACCESS_STATE_UNAVAILABLE: 736 if (core_alua_state_unavailable(cmd, cdb)) 737 return TCM_CHECK_CONDITION_NOT_READY; 738 break; 739 case ALUA_ACCESS_STATE_TRANSITION: 740 if (core_alua_state_transition(cmd, cdb)) 741 return TCM_CHECK_CONDITION_NOT_READY; 742 break; 743 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 744 if (core_alua_state_lba_dependent(cmd, tg_pt_gp)) 745 return TCM_CHECK_CONDITION_NOT_READY; 746 break; 747 /* 748 * OFFLINE is a secondary ALUA target port group access state, that is 749 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1 750 */ 751 case ALUA_ACCESS_STATE_OFFLINE: 752 default: 753 pr_err("Unknown ALUA access state: 0x%02x\n", 754 out_alua_state); 755 return TCM_INVALID_CDB_FIELD; 756 } 757 758 return 0; 759 } 760 761 /* 762 * Check implicit and explicit ALUA state change request. 763 */ 764 static sense_reason_t 765 core_alua_check_transition(int state, int valid, int *primary) 766 { 767 /* 768 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 769 * defined as primary target port asymmetric access states. 770 */ 771 switch (state) { 772 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 773 if (!(valid & ALUA_AO_SUP)) 774 goto not_supported; 775 *primary = 1; 776 break; 777 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 778 if (!(valid & ALUA_AN_SUP)) 779 goto not_supported; 780 *primary = 1; 781 break; 782 case ALUA_ACCESS_STATE_STANDBY: 783 if (!(valid & ALUA_S_SUP)) 784 goto not_supported; 785 *primary = 1; 786 break; 787 case ALUA_ACCESS_STATE_UNAVAILABLE: 788 if (!(valid & ALUA_U_SUP)) 789 goto not_supported; 790 *primary = 1; 791 break; 792 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 793 if (!(valid & ALUA_LBD_SUP)) 794 goto not_supported; 795 *primary = 1; 796 break; 797 case ALUA_ACCESS_STATE_OFFLINE: 798 /* 799 * OFFLINE state is defined as a secondary target port 800 * asymmetric access state. 801 */ 802 if (!(valid & ALUA_O_SUP)) 803 goto not_supported; 804 *primary = 0; 805 break; 806 case ALUA_ACCESS_STATE_TRANSITION: 807 /* 808 * Transitioning is set internally, and 809 * cannot be selected manually. 810 */ 811 goto not_supported; 812 default: 813 pr_err("Unknown ALUA access state: 0x%02x\n", state); 814 return TCM_INVALID_PARAMETER_LIST; 815 } 816 817 return 0; 818 819 not_supported: 820 pr_err("ALUA access state %s not supported", 821 core_alua_dump_state(state)); 822 return TCM_INVALID_PARAMETER_LIST; 823 } 824 825 static char *core_alua_dump_state(int state) 826 { 827 switch (state) { 828 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 829 return "Active/Optimized"; 830 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 831 return "Active/NonOptimized"; 832 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 833 return "LBA Dependent"; 834 case ALUA_ACCESS_STATE_STANDBY: 835 return "Standby"; 836 case ALUA_ACCESS_STATE_UNAVAILABLE: 837 return "Unavailable"; 838 case ALUA_ACCESS_STATE_OFFLINE: 839 return "Offline"; 840 case ALUA_ACCESS_STATE_TRANSITION: 841 return "Transitioning"; 842 default: 843 return "Unknown"; 844 } 845 846 return NULL; 847 } 848 849 char *core_alua_dump_status(int status) 850 { 851 switch (status) { 852 case ALUA_STATUS_NONE: 853 return "None"; 854 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 855 return "Altered by Explicit STPG"; 856 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 857 return "Altered by Implicit ALUA"; 858 default: 859 return "Unknown"; 860 } 861 862 return NULL; 863 } 864 865 /* 866 * Used by fabric modules to determine when we need to delay processing 867 * for the Active/NonOptimized paths.. 868 */ 869 int core_alua_check_nonop_delay( 870 struct se_cmd *cmd) 871 { 872 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 873 return 0; 874 if (in_interrupt()) 875 return 0; 876 /* 877 * The ALUA Active/NonOptimized access state delay can be disabled 878 * in via configfs with a value of zero 879 */ 880 if (!cmd->alua_nonop_delay) 881 return 0; 882 /* 883 * struct se_cmd->alua_nonop_delay gets set by a target port group 884 * defined interval in core_alua_state_nonoptimized() 885 */ 886 msleep_interruptible(cmd->alua_nonop_delay); 887 return 0; 888 } 889 EXPORT_SYMBOL(core_alua_check_nonop_delay); 890 891 static int core_alua_write_tpg_metadata( 892 const char *path, 893 unsigned char *md_buf, 894 u32 md_buf_len) 895 { 896 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 897 int ret; 898 899 if (IS_ERR(file)) { 900 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 901 return -ENODEV; 902 } 903 ret = kernel_write(file, md_buf, md_buf_len, 0); 904 if (ret < 0) 905 pr_err("Error writing ALUA metadata file: %s\n", path); 906 fput(file); 907 return (ret < 0) ? -EIO : 0; 908 } 909 910 /* 911 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 912 */ 913 static int core_alua_update_tpg_primary_metadata( 914 struct t10_alua_tg_pt_gp *tg_pt_gp) 915 { 916 unsigned char *md_buf; 917 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 918 char path[ALUA_METADATA_PATH_LEN]; 919 int len, rc; 920 921 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 922 if (!md_buf) { 923 pr_err("Unable to allocate buf for ALUA metadata\n"); 924 return -ENOMEM; 925 } 926 927 memset(path, 0, ALUA_METADATA_PATH_LEN); 928 929 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 930 "tg_pt_gp_id=%hu\n" 931 "alua_access_state=0x%02x\n" 932 "alua_access_status=0x%02x\n", 933 tg_pt_gp->tg_pt_gp_id, 934 tg_pt_gp->tg_pt_gp_alua_pending_state, 935 tg_pt_gp->tg_pt_gp_alua_access_status); 936 937 snprintf(path, ALUA_METADATA_PATH_LEN, 938 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0], 939 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 940 941 rc = core_alua_write_tpg_metadata(path, md_buf, len); 942 kfree(md_buf); 943 return rc; 944 } 945 946 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) 947 { 948 struct se_dev_entry *se_deve; 949 struct se_lun *lun; 950 struct se_lun_acl *lacl; 951 952 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 953 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 954 lun_tg_pt_gp_link) { 955 /* 956 * After an implicit target port asymmetric access state 957 * change, a device server shall establish a unit attention 958 * condition for the initiator port associated with every I_T 959 * nexus with the additional sense code set to ASYMMETRIC 960 * ACCESS STATE CHANGED. 961 * 962 * After an explicit target port asymmetric access state 963 * change, a device server shall establish a unit attention 964 * condition with the additional sense code set to ASYMMETRIC 965 * ACCESS STATE CHANGED for the initiator port associated with 966 * every I_T nexus other than the I_T nexus on which the SET 967 * TARGET PORT GROUPS command 968 */ 969 if (!percpu_ref_tryget_live(&lun->lun_ref)) 970 continue; 971 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 972 973 spin_lock(&lun->lun_deve_lock); 974 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { 975 lacl = rcu_dereference_check(se_deve->se_lun_acl, 976 lockdep_is_held(&lun->lun_deve_lock)); 977 978 /* 979 * spc4r37 p.242: 980 * After an explicit target port asymmetric access 981 * state change, a device server shall establish a 982 * unit attention condition with the additional sense 983 * code set to ASYMMETRIC ACCESS STATE CHANGED for 984 * the initiator port associated with every I_T nexus 985 * other than the I_T nexus on which the SET TARGET 986 * PORT GROUPS command was received. 987 */ 988 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 989 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 990 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && 991 (tg_pt_gp->tg_pt_gp_alua_lun == lun)) 992 continue; 993 994 /* 995 * se_deve->se_lun_acl pointer may be NULL for a 996 * entry created without explicit Node+MappedLUN ACLs 997 */ 998 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 999 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) 1000 continue; 1001 1002 core_scsi3_ua_allocate(se_deve, 0x2A, 1003 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1004 } 1005 spin_unlock(&lun->lun_deve_lock); 1006 1007 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1008 percpu_ref_put(&lun->lun_ref); 1009 } 1010 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1011 } 1012 1013 static void core_alua_do_transition_tg_pt_work(struct work_struct *work) 1014 { 1015 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, 1016 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work); 1017 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1018 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == 1019 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); 1020 1021 /* 1022 * Update the ALUA metadata buf that has been allocated in 1023 * core_alua_do_port_transition(), this metadata will be written 1024 * to struct file. 1025 * 1026 * Note that there is the case where we do not want to update the 1027 * metadata when the saved metadata is being parsed in userspace 1028 * when setting the existing port access state and access status. 1029 * 1030 * Also note that the failure to write out the ALUA metadata to 1031 * struct file does NOT affect the actual ALUA transition. 1032 */ 1033 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1034 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1035 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1036 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1037 } 1038 /* 1039 * Set the current primary ALUA access state to the requested new state 1040 */ 1041 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1042 tg_pt_gp->tg_pt_gp_alua_pending_state); 1043 1044 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1045 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1046 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1047 tg_pt_gp->tg_pt_gp_id, 1048 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1049 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1050 1051 core_alua_queue_state_change_ua(tg_pt_gp); 1052 1053 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1054 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1055 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1056 1057 if (tg_pt_gp->tg_pt_gp_transition_complete) 1058 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1059 } 1060 1061 static int core_alua_do_transition_tg_pt( 1062 struct t10_alua_tg_pt_gp *tg_pt_gp, 1063 int new_state, 1064 int explicit) 1065 { 1066 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1067 DECLARE_COMPLETION_ONSTACK(wait); 1068 1069 /* Nothing to be done here */ 1070 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1071 return 0; 1072 1073 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1074 return -EAGAIN; 1075 1076 /* 1077 * Flush any pending transitions 1078 */ 1079 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && 1080 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1081 ALUA_ACCESS_STATE_TRANSITION) { 1082 /* Just in case */ 1083 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1084 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1085 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1086 wait_for_completion(&wait); 1087 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1088 return 0; 1089 } 1090 1091 /* 1092 * Save the old primary ALUA access state, and set the current state 1093 * to ALUA_ACCESS_STATE_TRANSITION. 1094 */ 1095 tg_pt_gp->tg_pt_gp_alua_previous_state = 1096 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1097 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1098 1099 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1100 ALUA_ACCESS_STATE_TRANSITION); 1101 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1102 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1103 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1104 1105 core_alua_queue_state_change_ua(tg_pt_gp); 1106 1107 /* 1108 * Check for the optional ALUA primary state transition delay 1109 */ 1110 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1111 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1112 1113 /* 1114 * Take a reference for workqueue item 1115 */ 1116 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1117 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1118 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1119 1120 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { 1121 unsigned long transition_tmo; 1122 1123 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; 1124 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1125 &tg_pt_gp->tg_pt_gp_transition_work, 1126 transition_tmo); 1127 } else { 1128 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1129 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1130 &tg_pt_gp->tg_pt_gp_transition_work, 0); 1131 wait_for_completion(&wait); 1132 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1133 } 1134 1135 return 0; 1136 } 1137 1138 int core_alua_do_port_transition( 1139 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1140 struct se_device *l_dev, 1141 struct se_lun *l_lun, 1142 struct se_node_acl *l_nacl, 1143 int new_state, 1144 int explicit) 1145 { 1146 struct se_device *dev; 1147 struct t10_alua_lu_gp *lu_gp; 1148 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1149 struct t10_alua_tg_pt_gp *tg_pt_gp; 1150 int primary, valid_states, rc = 0; 1151 1152 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1153 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1154 return -EINVAL; 1155 1156 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1157 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1158 lu_gp = local_lu_gp_mem->lu_gp; 1159 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1160 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1161 /* 1162 * For storage objects that are members of the 'default_lu_gp', 1163 * we only do transition on the passed *l_tp_pt_gp, and not 1164 * on all of the matching target port groups IDs in default_lu_gp. 1165 */ 1166 if (!lu_gp->lu_gp_id) { 1167 /* 1168 * core_alua_do_transition_tg_pt() will always return 1169 * success. 1170 */ 1171 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1172 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1173 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1174 new_state, explicit); 1175 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1176 return rc; 1177 } 1178 /* 1179 * For all other LU groups aside from 'default_lu_gp', walk all of 1180 * the associated storage objects looking for a matching target port 1181 * group ID from the local target port group. 1182 */ 1183 spin_lock(&lu_gp->lu_gp_lock); 1184 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1185 lu_gp_mem_list) { 1186 1187 dev = lu_gp_mem->lu_gp_mem_dev; 1188 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1189 spin_unlock(&lu_gp->lu_gp_lock); 1190 1191 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1192 list_for_each_entry(tg_pt_gp, 1193 &dev->t10_alua.tg_pt_gps_list, 1194 tg_pt_gp_list) { 1195 1196 if (!tg_pt_gp->tg_pt_gp_valid_id) 1197 continue; 1198 /* 1199 * If the target behavior port asymmetric access state 1200 * is changed for any target port group accessible via 1201 * a logical unit within a LU group, the target port 1202 * behavior group asymmetric access states for the same 1203 * target port group accessible via other logical units 1204 * in that LU group will also change. 1205 */ 1206 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1207 continue; 1208 1209 if (l_tg_pt_gp == tg_pt_gp) { 1210 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1211 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1212 } else { 1213 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1214 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1215 } 1216 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1217 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1218 /* 1219 * core_alua_do_transition_tg_pt() will always return 1220 * success. 1221 */ 1222 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1223 new_state, explicit); 1224 1225 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1226 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1227 if (rc) 1228 break; 1229 } 1230 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1231 1232 spin_lock(&lu_gp->lu_gp_lock); 1233 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1234 } 1235 spin_unlock(&lu_gp->lu_gp_lock); 1236 1237 if (!rc) { 1238 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1239 " Group IDs: %hu %s transition to primary state: %s\n", 1240 config_item_name(&lu_gp->lu_gp_group.cg_item), 1241 l_tg_pt_gp->tg_pt_gp_id, 1242 (explicit) ? "explicit" : "implicit", 1243 core_alua_dump_state(new_state)); 1244 } 1245 1246 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1247 return rc; 1248 } 1249 1250 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1251 { 1252 struct se_portal_group *se_tpg = lun->lun_tpg; 1253 unsigned char *md_buf; 1254 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1255 int len, rc; 1256 1257 mutex_lock(&lun->lun_tg_pt_md_mutex); 1258 1259 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1260 if (!md_buf) { 1261 pr_err("Unable to allocate buf for ALUA metadata\n"); 1262 rc = -ENOMEM; 1263 goto out_unlock; 1264 } 1265 1266 memset(path, 0, ALUA_METADATA_PATH_LEN); 1267 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1268 1269 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1270 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1271 1272 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1273 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1274 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1275 1276 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1277 "alua_tg_pt_status=0x%02x\n", 1278 atomic_read(&lun->lun_tg_pt_secondary_offline), 1279 lun->lun_tg_pt_secondary_stat); 1280 1281 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu", 1282 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1283 lun->unpacked_lun); 1284 1285 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1286 kfree(md_buf); 1287 1288 out_unlock: 1289 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1290 return rc; 1291 } 1292 1293 static int core_alua_set_tg_pt_secondary_state( 1294 struct se_lun *lun, 1295 int explicit, 1296 int offline) 1297 { 1298 struct t10_alua_tg_pt_gp *tg_pt_gp; 1299 int trans_delay_msecs; 1300 1301 spin_lock(&lun->lun_tg_pt_gp_lock); 1302 tg_pt_gp = lun->lun_tg_pt_gp; 1303 if (!tg_pt_gp) { 1304 spin_unlock(&lun->lun_tg_pt_gp_lock); 1305 pr_err("Unable to complete secondary state" 1306 " transition\n"); 1307 return -EINVAL; 1308 } 1309 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1310 /* 1311 * Set the secondary ALUA target port access state to OFFLINE 1312 * or release the previously secondary state for struct se_lun 1313 */ 1314 if (offline) 1315 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1316 else 1317 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1318 1319 lun->lun_tg_pt_secondary_stat = (explicit) ? 1320 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1321 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1322 1323 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1324 " to secondary access state: %s\n", (explicit) ? "explicit" : 1325 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1326 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1327 1328 spin_unlock(&lun->lun_tg_pt_gp_lock); 1329 /* 1330 * Do the optional transition delay after we set the secondary 1331 * ALUA access state. 1332 */ 1333 if (trans_delay_msecs != 0) 1334 msleep_interruptible(trans_delay_msecs); 1335 /* 1336 * See if we need to update the ALUA fabric port metadata for 1337 * secondary state and status 1338 */ 1339 if (lun->lun_tg_pt_secondary_write_md) 1340 core_alua_update_tpg_secondary_metadata(lun); 1341 1342 return 0; 1343 } 1344 1345 struct t10_alua_lba_map * 1346 core_alua_allocate_lba_map(struct list_head *list, 1347 u64 first_lba, u64 last_lba) 1348 { 1349 struct t10_alua_lba_map *lba_map; 1350 1351 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1352 if (!lba_map) { 1353 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1354 return ERR_PTR(-ENOMEM); 1355 } 1356 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1357 lba_map->lba_map_first_lba = first_lba; 1358 lba_map->lba_map_last_lba = last_lba; 1359 1360 list_add_tail(&lba_map->lba_map_list, list); 1361 return lba_map; 1362 } 1363 1364 int 1365 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1366 int pg_id, int state) 1367 { 1368 struct t10_alua_lba_map_member *lba_map_mem; 1369 1370 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1371 lba_map_mem_list) { 1372 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1373 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1374 return -EINVAL; 1375 } 1376 } 1377 1378 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1379 if (!lba_map_mem) { 1380 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1381 return -ENOMEM; 1382 } 1383 lba_map_mem->lba_map_mem_alua_state = state; 1384 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1385 1386 list_add_tail(&lba_map_mem->lba_map_mem_list, 1387 &lba_map->lba_map_mem_list); 1388 return 0; 1389 } 1390 1391 void 1392 core_alua_free_lba_map(struct list_head *lba_list) 1393 { 1394 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1395 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1396 1397 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1398 lba_map_list) { 1399 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1400 &lba_map->lba_map_mem_list, 1401 lba_map_mem_list) { 1402 list_del(&lba_map_mem->lba_map_mem_list); 1403 kmem_cache_free(t10_alua_lba_map_mem_cache, 1404 lba_map_mem); 1405 } 1406 list_del(&lba_map->lba_map_list); 1407 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1408 } 1409 } 1410 1411 void 1412 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1413 int segment_size, int segment_mult) 1414 { 1415 struct list_head old_lba_map_list; 1416 struct t10_alua_tg_pt_gp *tg_pt_gp; 1417 int activate = 0, supported; 1418 1419 INIT_LIST_HEAD(&old_lba_map_list); 1420 spin_lock(&dev->t10_alua.lba_map_lock); 1421 dev->t10_alua.lba_map_segment_size = segment_size; 1422 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1423 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1424 if (lba_map_list) { 1425 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1426 activate = 1; 1427 } 1428 spin_unlock(&dev->t10_alua.lba_map_lock); 1429 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1430 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1431 tg_pt_gp_list) { 1432 1433 if (!tg_pt_gp->tg_pt_gp_valid_id) 1434 continue; 1435 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1436 if (activate) 1437 supported |= ALUA_LBD_SUP; 1438 else 1439 supported &= ~ALUA_LBD_SUP; 1440 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1441 } 1442 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1443 core_alua_free_lba_map(&old_lba_map_list); 1444 } 1445 1446 struct t10_alua_lu_gp * 1447 core_alua_allocate_lu_gp(const char *name, int def_group) 1448 { 1449 struct t10_alua_lu_gp *lu_gp; 1450 1451 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1452 if (!lu_gp) { 1453 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1454 return ERR_PTR(-ENOMEM); 1455 } 1456 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1457 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1458 spin_lock_init(&lu_gp->lu_gp_lock); 1459 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1460 1461 if (def_group) { 1462 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1463 lu_gp->lu_gp_valid_id = 1; 1464 alua_lu_gps_count++; 1465 } 1466 1467 return lu_gp; 1468 } 1469 1470 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1471 { 1472 struct t10_alua_lu_gp *lu_gp_tmp; 1473 u16 lu_gp_id_tmp; 1474 /* 1475 * The lu_gp->lu_gp_id may only be set once.. 1476 */ 1477 if (lu_gp->lu_gp_valid_id) { 1478 pr_warn("ALUA LU Group already has a valid ID," 1479 " ignoring request\n"); 1480 return -EINVAL; 1481 } 1482 1483 spin_lock(&lu_gps_lock); 1484 if (alua_lu_gps_count == 0x0000ffff) { 1485 pr_err("Maximum ALUA alua_lu_gps_count:" 1486 " 0x0000ffff reached\n"); 1487 spin_unlock(&lu_gps_lock); 1488 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1489 return -ENOSPC; 1490 } 1491 again: 1492 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1493 alua_lu_gps_counter++; 1494 1495 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1496 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1497 if (!lu_gp_id) 1498 goto again; 1499 1500 pr_warn("ALUA Logical Unit Group ID: %hu" 1501 " already exists, ignoring request\n", 1502 lu_gp_id); 1503 spin_unlock(&lu_gps_lock); 1504 return -EINVAL; 1505 } 1506 } 1507 1508 lu_gp->lu_gp_id = lu_gp_id_tmp; 1509 lu_gp->lu_gp_valid_id = 1; 1510 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1511 alua_lu_gps_count++; 1512 spin_unlock(&lu_gps_lock); 1513 1514 return 0; 1515 } 1516 1517 static struct t10_alua_lu_gp_member * 1518 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1519 { 1520 struct t10_alua_lu_gp_member *lu_gp_mem; 1521 1522 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1523 if (!lu_gp_mem) { 1524 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1525 return ERR_PTR(-ENOMEM); 1526 } 1527 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1528 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1529 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1530 1531 lu_gp_mem->lu_gp_mem_dev = dev; 1532 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1533 1534 return lu_gp_mem; 1535 } 1536 1537 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1538 { 1539 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1540 /* 1541 * Once we have reached this point, config_item_put() has 1542 * already been called from target_core_alua_drop_lu_gp(). 1543 * 1544 * Here, we remove the *lu_gp from the global list so that 1545 * no associations can be made while we are releasing 1546 * struct t10_alua_lu_gp. 1547 */ 1548 spin_lock(&lu_gps_lock); 1549 list_del(&lu_gp->lu_gp_node); 1550 alua_lu_gps_count--; 1551 spin_unlock(&lu_gps_lock); 1552 /* 1553 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1554 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1555 * released with core_alua_put_lu_gp_from_name() 1556 */ 1557 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1558 cpu_relax(); 1559 /* 1560 * Release reference to struct t10_alua_lu_gp * from all associated 1561 * struct se_device. 1562 */ 1563 spin_lock(&lu_gp->lu_gp_lock); 1564 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1565 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1566 if (lu_gp_mem->lu_gp_assoc) { 1567 list_del(&lu_gp_mem->lu_gp_mem_list); 1568 lu_gp->lu_gp_members--; 1569 lu_gp_mem->lu_gp_assoc = 0; 1570 } 1571 spin_unlock(&lu_gp->lu_gp_lock); 1572 /* 1573 * 1574 * lu_gp_mem is associated with a single 1575 * struct se_device->dev_alua_lu_gp_mem, and is released when 1576 * struct se_device is released via core_alua_free_lu_gp_mem(). 1577 * 1578 * If the passed lu_gp does NOT match the default_lu_gp, assume 1579 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1580 */ 1581 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1582 if (lu_gp != default_lu_gp) 1583 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1584 default_lu_gp); 1585 else 1586 lu_gp_mem->lu_gp = NULL; 1587 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1588 1589 spin_lock(&lu_gp->lu_gp_lock); 1590 } 1591 spin_unlock(&lu_gp->lu_gp_lock); 1592 1593 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1594 } 1595 1596 void core_alua_free_lu_gp_mem(struct se_device *dev) 1597 { 1598 struct t10_alua_lu_gp *lu_gp; 1599 struct t10_alua_lu_gp_member *lu_gp_mem; 1600 1601 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1602 if (!lu_gp_mem) 1603 return; 1604 1605 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1606 cpu_relax(); 1607 1608 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1609 lu_gp = lu_gp_mem->lu_gp; 1610 if (lu_gp) { 1611 spin_lock(&lu_gp->lu_gp_lock); 1612 if (lu_gp_mem->lu_gp_assoc) { 1613 list_del(&lu_gp_mem->lu_gp_mem_list); 1614 lu_gp->lu_gp_members--; 1615 lu_gp_mem->lu_gp_assoc = 0; 1616 } 1617 spin_unlock(&lu_gp->lu_gp_lock); 1618 lu_gp_mem->lu_gp = NULL; 1619 } 1620 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1621 1622 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1623 } 1624 1625 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1626 { 1627 struct t10_alua_lu_gp *lu_gp; 1628 struct config_item *ci; 1629 1630 spin_lock(&lu_gps_lock); 1631 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1632 if (!lu_gp->lu_gp_valid_id) 1633 continue; 1634 ci = &lu_gp->lu_gp_group.cg_item; 1635 if (!strcmp(config_item_name(ci), name)) { 1636 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1637 spin_unlock(&lu_gps_lock); 1638 return lu_gp; 1639 } 1640 } 1641 spin_unlock(&lu_gps_lock); 1642 1643 return NULL; 1644 } 1645 1646 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1647 { 1648 spin_lock(&lu_gps_lock); 1649 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1650 spin_unlock(&lu_gps_lock); 1651 } 1652 1653 /* 1654 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1655 */ 1656 void __core_alua_attach_lu_gp_mem( 1657 struct t10_alua_lu_gp_member *lu_gp_mem, 1658 struct t10_alua_lu_gp *lu_gp) 1659 { 1660 spin_lock(&lu_gp->lu_gp_lock); 1661 lu_gp_mem->lu_gp = lu_gp; 1662 lu_gp_mem->lu_gp_assoc = 1; 1663 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1664 lu_gp->lu_gp_members++; 1665 spin_unlock(&lu_gp->lu_gp_lock); 1666 } 1667 1668 /* 1669 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1670 */ 1671 void __core_alua_drop_lu_gp_mem( 1672 struct t10_alua_lu_gp_member *lu_gp_mem, 1673 struct t10_alua_lu_gp *lu_gp) 1674 { 1675 spin_lock(&lu_gp->lu_gp_lock); 1676 list_del(&lu_gp_mem->lu_gp_mem_list); 1677 lu_gp_mem->lu_gp = NULL; 1678 lu_gp_mem->lu_gp_assoc = 0; 1679 lu_gp->lu_gp_members--; 1680 spin_unlock(&lu_gp->lu_gp_lock); 1681 } 1682 1683 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1684 const char *name, int def_group) 1685 { 1686 struct t10_alua_tg_pt_gp *tg_pt_gp; 1687 1688 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1689 if (!tg_pt_gp) { 1690 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1691 return NULL; 1692 } 1693 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1694 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1695 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1696 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1697 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1698 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1699 core_alua_do_transition_tg_pt_work); 1700 tg_pt_gp->tg_pt_gp_dev = dev; 1701 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1702 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1703 /* 1704 * Enable both explicit and implicit ALUA support by default 1705 */ 1706 tg_pt_gp->tg_pt_gp_alua_access_type = 1707 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1708 /* 1709 * Set the default Active/NonOptimized Delay in milliseconds 1710 */ 1711 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1712 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1713 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1714 1715 /* 1716 * Enable all supported states 1717 */ 1718 tg_pt_gp->tg_pt_gp_alua_supported_states = 1719 ALUA_T_SUP | ALUA_O_SUP | 1720 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1721 1722 if (def_group) { 1723 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1724 tg_pt_gp->tg_pt_gp_id = 1725 dev->t10_alua.alua_tg_pt_gps_counter++; 1726 tg_pt_gp->tg_pt_gp_valid_id = 1; 1727 dev->t10_alua.alua_tg_pt_gps_count++; 1728 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1729 &dev->t10_alua.tg_pt_gps_list); 1730 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1731 } 1732 1733 return tg_pt_gp; 1734 } 1735 1736 int core_alua_set_tg_pt_gp_id( 1737 struct t10_alua_tg_pt_gp *tg_pt_gp, 1738 u16 tg_pt_gp_id) 1739 { 1740 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1741 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1742 u16 tg_pt_gp_id_tmp; 1743 1744 /* 1745 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1746 */ 1747 if (tg_pt_gp->tg_pt_gp_valid_id) { 1748 pr_warn("ALUA TG PT Group already has a valid ID," 1749 " ignoring request\n"); 1750 return -EINVAL; 1751 } 1752 1753 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1754 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1755 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1756 " 0x0000ffff reached\n"); 1757 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1758 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1759 return -ENOSPC; 1760 } 1761 again: 1762 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1763 dev->t10_alua.alua_tg_pt_gps_counter++; 1764 1765 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1766 tg_pt_gp_list) { 1767 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1768 if (!tg_pt_gp_id) 1769 goto again; 1770 1771 pr_err("ALUA Target Port Group ID: %hu already" 1772 " exists, ignoring request\n", tg_pt_gp_id); 1773 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1774 return -EINVAL; 1775 } 1776 } 1777 1778 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1779 tg_pt_gp->tg_pt_gp_valid_id = 1; 1780 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1781 &dev->t10_alua.tg_pt_gps_list); 1782 dev->t10_alua.alua_tg_pt_gps_count++; 1783 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1784 1785 return 0; 1786 } 1787 1788 void core_alua_free_tg_pt_gp( 1789 struct t10_alua_tg_pt_gp *tg_pt_gp) 1790 { 1791 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1792 struct se_lun *lun, *next; 1793 1794 /* 1795 * Once we have reached this point, config_item_put() has already 1796 * been called from target_core_alua_drop_tg_pt_gp(). 1797 * 1798 * Here we remove *tg_pt_gp from the global list so that 1799 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1800 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1801 */ 1802 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1803 list_del(&tg_pt_gp->tg_pt_gp_list); 1804 dev->t10_alua.alua_tg_pt_gps_counter--; 1805 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1806 1807 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1808 1809 /* 1810 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1811 * core_alua_get_tg_pt_gp_by_name() in 1812 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1813 * to be released with core_alua_put_tg_pt_gp_from_name(). 1814 */ 1815 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1816 cpu_relax(); 1817 1818 /* 1819 * Release reference to struct t10_alua_tg_pt_gp from all associated 1820 * struct se_port. 1821 */ 1822 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1823 list_for_each_entry_safe(lun, next, 1824 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1825 list_del_init(&lun->lun_tg_pt_gp_link); 1826 tg_pt_gp->tg_pt_gp_members--; 1827 1828 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1829 /* 1830 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1831 * assume we want to re-associate a given tg_pt_gp_mem with 1832 * default_tg_pt_gp. 1833 */ 1834 spin_lock(&lun->lun_tg_pt_gp_lock); 1835 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1836 __target_attach_tg_pt_gp(lun, 1837 dev->t10_alua.default_tg_pt_gp); 1838 } else 1839 lun->lun_tg_pt_gp = NULL; 1840 spin_unlock(&lun->lun_tg_pt_gp_lock); 1841 1842 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1843 } 1844 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1845 1846 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1847 } 1848 1849 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1850 struct se_device *dev, const char *name) 1851 { 1852 struct t10_alua_tg_pt_gp *tg_pt_gp; 1853 struct config_item *ci; 1854 1855 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1856 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1857 tg_pt_gp_list) { 1858 if (!tg_pt_gp->tg_pt_gp_valid_id) 1859 continue; 1860 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1861 if (!strcmp(config_item_name(ci), name)) { 1862 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1863 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1864 return tg_pt_gp; 1865 } 1866 } 1867 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1868 1869 return NULL; 1870 } 1871 1872 static void core_alua_put_tg_pt_gp_from_name( 1873 struct t10_alua_tg_pt_gp *tg_pt_gp) 1874 { 1875 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1876 1877 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1878 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1879 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1880 } 1881 1882 static void __target_attach_tg_pt_gp(struct se_lun *lun, 1883 struct t10_alua_tg_pt_gp *tg_pt_gp) 1884 { 1885 struct se_dev_entry *se_deve; 1886 1887 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1888 1889 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1890 lun->lun_tg_pt_gp = tg_pt_gp; 1891 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1892 tg_pt_gp->tg_pt_gp_members++; 1893 spin_lock(&lun->lun_deve_lock); 1894 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1895 core_scsi3_ua_allocate(se_deve, 0x3f, 1896 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1897 spin_unlock(&lun->lun_deve_lock); 1898 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1899 } 1900 1901 void target_attach_tg_pt_gp(struct se_lun *lun, 1902 struct t10_alua_tg_pt_gp *tg_pt_gp) 1903 { 1904 spin_lock(&lun->lun_tg_pt_gp_lock); 1905 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1906 spin_unlock(&lun->lun_tg_pt_gp_lock); 1907 } 1908 1909 static void __target_detach_tg_pt_gp(struct se_lun *lun, 1910 struct t10_alua_tg_pt_gp *tg_pt_gp) 1911 { 1912 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1913 1914 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1915 list_del_init(&lun->lun_tg_pt_gp_link); 1916 tg_pt_gp->tg_pt_gp_members--; 1917 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1918 1919 lun->lun_tg_pt_gp = NULL; 1920 } 1921 1922 void target_detach_tg_pt_gp(struct se_lun *lun) 1923 { 1924 struct t10_alua_tg_pt_gp *tg_pt_gp; 1925 1926 spin_lock(&lun->lun_tg_pt_gp_lock); 1927 tg_pt_gp = lun->lun_tg_pt_gp; 1928 if (tg_pt_gp) 1929 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1930 spin_unlock(&lun->lun_tg_pt_gp_lock); 1931 } 1932 1933 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1934 { 1935 struct config_item *tg_pt_ci; 1936 struct t10_alua_tg_pt_gp *tg_pt_gp; 1937 ssize_t len = 0; 1938 1939 spin_lock(&lun->lun_tg_pt_gp_lock); 1940 tg_pt_gp = lun->lun_tg_pt_gp; 1941 if (tg_pt_gp) { 1942 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1943 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1944 " %hu\nTG Port Primary Access State: %s\nTG Port " 1945 "Primary Access Status: %s\nTG Port Secondary Access" 1946 " State: %s\nTG Port Secondary Access Status: %s\n", 1947 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1948 core_alua_dump_state(atomic_read( 1949 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1950 core_alua_dump_status( 1951 tg_pt_gp->tg_pt_gp_alua_access_status), 1952 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1953 "Offline" : "None", 1954 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1955 } 1956 spin_unlock(&lun->lun_tg_pt_gp_lock); 1957 1958 return len; 1959 } 1960 1961 ssize_t core_alua_store_tg_pt_gp_info( 1962 struct se_lun *lun, 1963 const char *page, 1964 size_t count) 1965 { 1966 struct se_portal_group *tpg = lun->lun_tpg; 1967 /* 1968 * rcu_dereference_raw protected by se_lun->lun_group symlink 1969 * reference to se_device->dev_group. 1970 */ 1971 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1972 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1973 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1974 int move = 0; 1975 1976 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH || 1977 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1978 return -ENODEV; 1979 1980 if (count > TG_PT_GROUP_NAME_BUF) { 1981 pr_err("ALUA Target Port Group alias too large!\n"); 1982 return -EINVAL; 1983 } 1984 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1985 memcpy(buf, page, count); 1986 /* 1987 * Any ALUA target port group alias besides "NULL" means we will be 1988 * making a new group association. 1989 */ 1990 if (strcmp(strstrip(buf), "NULL")) { 1991 /* 1992 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1993 * struct t10_alua_tg_pt_gp. This reference is released with 1994 * core_alua_put_tg_pt_gp_from_name() below. 1995 */ 1996 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1997 strstrip(buf)); 1998 if (!tg_pt_gp_new) 1999 return -ENODEV; 2000 } 2001 2002 spin_lock(&lun->lun_tg_pt_gp_lock); 2003 tg_pt_gp = lun->lun_tg_pt_gp; 2004 if (tg_pt_gp) { 2005 /* 2006 * Clearing an existing tg_pt_gp association, and replacing 2007 * with the default_tg_pt_gp. 2008 */ 2009 if (!tg_pt_gp_new) { 2010 pr_debug("Target_Core_ConfigFS: Moving" 2011 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2012 " alua/%s, ID: %hu back to" 2013 " default_tg_pt_gp\n", 2014 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2015 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2016 config_item_name(&lun->lun_group.cg_item), 2017 config_item_name( 2018 &tg_pt_gp->tg_pt_gp_group.cg_item), 2019 tg_pt_gp->tg_pt_gp_id); 2020 2021 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2022 __target_attach_tg_pt_gp(lun, 2023 dev->t10_alua.default_tg_pt_gp); 2024 spin_unlock(&lun->lun_tg_pt_gp_lock); 2025 2026 return count; 2027 } 2028 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2029 move = 1; 2030 } 2031 2032 __target_attach_tg_pt_gp(lun, tg_pt_gp_new); 2033 spin_unlock(&lun->lun_tg_pt_gp_lock); 2034 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2035 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2036 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2037 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2038 config_item_name(&lun->lun_group.cg_item), 2039 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2040 tg_pt_gp_new->tg_pt_gp_id); 2041 2042 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2043 return count; 2044 } 2045 2046 ssize_t core_alua_show_access_type( 2047 struct t10_alua_tg_pt_gp *tg_pt_gp, 2048 char *page) 2049 { 2050 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2051 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2052 return sprintf(page, "Implicit and Explicit\n"); 2053 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2054 return sprintf(page, "Implicit\n"); 2055 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2056 return sprintf(page, "Explicit\n"); 2057 else 2058 return sprintf(page, "None\n"); 2059 } 2060 2061 ssize_t core_alua_store_access_type( 2062 struct t10_alua_tg_pt_gp *tg_pt_gp, 2063 const char *page, 2064 size_t count) 2065 { 2066 unsigned long tmp; 2067 int ret; 2068 2069 ret = kstrtoul(page, 0, &tmp); 2070 if (ret < 0) { 2071 pr_err("Unable to extract alua_access_type\n"); 2072 return ret; 2073 } 2074 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2075 pr_err("Illegal value for alua_access_type:" 2076 " %lu\n", tmp); 2077 return -EINVAL; 2078 } 2079 if (tmp == 3) 2080 tg_pt_gp->tg_pt_gp_alua_access_type = 2081 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2082 else if (tmp == 2) 2083 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2084 else if (tmp == 1) 2085 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2086 else 2087 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2088 2089 return count; 2090 } 2091 2092 ssize_t core_alua_show_nonop_delay_msecs( 2093 struct t10_alua_tg_pt_gp *tg_pt_gp, 2094 char *page) 2095 { 2096 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2097 } 2098 2099 ssize_t core_alua_store_nonop_delay_msecs( 2100 struct t10_alua_tg_pt_gp *tg_pt_gp, 2101 const char *page, 2102 size_t count) 2103 { 2104 unsigned long tmp; 2105 int ret; 2106 2107 ret = kstrtoul(page, 0, &tmp); 2108 if (ret < 0) { 2109 pr_err("Unable to extract nonop_delay_msecs\n"); 2110 return ret; 2111 } 2112 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2113 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2114 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2115 ALUA_MAX_NONOP_DELAY_MSECS); 2116 return -EINVAL; 2117 } 2118 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2119 2120 return count; 2121 } 2122 2123 ssize_t core_alua_show_trans_delay_msecs( 2124 struct t10_alua_tg_pt_gp *tg_pt_gp, 2125 char *page) 2126 { 2127 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2128 } 2129 2130 ssize_t core_alua_store_trans_delay_msecs( 2131 struct t10_alua_tg_pt_gp *tg_pt_gp, 2132 const char *page, 2133 size_t count) 2134 { 2135 unsigned long tmp; 2136 int ret; 2137 2138 ret = kstrtoul(page, 0, &tmp); 2139 if (ret < 0) { 2140 pr_err("Unable to extract trans_delay_msecs\n"); 2141 return ret; 2142 } 2143 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2144 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2145 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2146 ALUA_MAX_TRANS_DELAY_MSECS); 2147 return -EINVAL; 2148 } 2149 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2150 2151 return count; 2152 } 2153 2154 ssize_t core_alua_show_implicit_trans_secs( 2155 struct t10_alua_tg_pt_gp *tg_pt_gp, 2156 char *page) 2157 { 2158 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2159 } 2160 2161 ssize_t core_alua_store_implicit_trans_secs( 2162 struct t10_alua_tg_pt_gp *tg_pt_gp, 2163 const char *page, 2164 size_t count) 2165 { 2166 unsigned long tmp; 2167 int ret; 2168 2169 ret = kstrtoul(page, 0, &tmp); 2170 if (ret < 0) { 2171 pr_err("Unable to extract implicit_trans_secs\n"); 2172 return ret; 2173 } 2174 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2175 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2176 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2177 ALUA_MAX_IMPLICIT_TRANS_SECS); 2178 return -EINVAL; 2179 } 2180 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2181 2182 return count; 2183 } 2184 2185 ssize_t core_alua_show_preferred_bit( 2186 struct t10_alua_tg_pt_gp *tg_pt_gp, 2187 char *page) 2188 { 2189 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2190 } 2191 2192 ssize_t core_alua_store_preferred_bit( 2193 struct t10_alua_tg_pt_gp *tg_pt_gp, 2194 const char *page, 2195 size_t count) 2196 { 2197 unsigned long tmp; 2198 int ret; 2199 2200 ret = kstrtoul(page, 0, &tmp); 2201 if (ret < 0) { 2202 pr_err("Unable to extract preferred ALUA value\n"); 2203 return ret; 2204 } 2205 if ((tmp != 0) && (tmp != 1)) { 2206 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2207 return -EINVAL; 2208 } 2209 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2210 2211 return count; 2212 } 2213 2214 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2215 { 2216 return sprintf(page, "%d\n", 2217 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2218 } 2219 2220 ssize_t core_alua_store_offline_bit( 2221 struct se_lun *lun, 2222 const char *page, 2223 size_t count) 2224 { 2225 /* 2226 * rcu_dereference_raw protected by se_lun->lun_group symlink 2227 * reference to se_device->dev_group. 2228 */ 2229 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2230 unsigned long tmp; 2231 int ret; 2232 2233 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH || 2234 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2235 return -ENODEV; 2236 2237 ret = kstrtoul(page, 0, &tmp); 2238 if (ret < 0) { 2239 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2240 return ret; 2241 } 2242 if ((tmp != 0) && (tmp != 1)) { 2243 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2244 tmp); 2245 return -EINVAL; 2246 } 2247 2248 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2249 if (ret < 0) 2250 return -EINVAL; 2251 2252 return count; 2253 } 2254 2255 ssize_t core_alua_show_secondary_status( 2256 struct se_lun *lun, 2257 char *page) 2258 { 2259 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2260 } 2261 2262 ssize_t core_alua_store_secondary_status( 2263 struct se_lun *lun, 2264 const char *page, 2265 size_t count) 2266 { 2267 unsigned long tmp; 2268 int ret; 2269 2270 ret = kstrtoul(page, 0, &tmp); 2271 if (ret < 0) { 2272 pr_err("Unable to extract alua_tg_pt_status\n"); 2273 return ret; 2274 } 2275 if ((tmp != ALUA_STATUS_NONE) && 2276 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2277 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2278 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2279 tmp); 2280 return -EINVAL; 2281 } 2282 lun->lun_tg_pt_secondary_stat = (int)tmp; 2283 2284 return count; 2285 } 2286 2287 ssize_t core_alua_show_secondary_write_metadata( 2288 struct se_lun *lun, 2289 char *page) 2290 { 2291 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2292 } 2293 2294 ssize_t core_alua_store_secondary_write_metadata( 2295 struct se_lun *lun, 2296 const char *page, 2297 size_t count) 2298 { 2299 unsigned long tmp; 2300 int ret; 2301 2302 ret = kstrtoul(page, 0, &tmp); 2303 if (ret < 0) { 2304 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2305 return ret; 2306 } 2307 if ((tmp != 0) && (tmp != 1)) { 2308 pr_err("Illegal value for alua_tg_pt_write_md:" 2309 " %lu\n", tmp); 2310 return -EINVAL; 2311 } 2312 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2313 2314 return count; 2315 } 2316 2317 int core_setup_alua(struct se_device *dev) 2318 { 2319 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && 2320 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2321 struct t10_alua_lu_gp_member *lu_gp_mem; 2322 2323 /* 2324 * Associate this struct se_device with the default ALUA 2325 * LUN Group. 2326 */ 2327 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2328 if (IS_ERR(lu_gp_mem)) 2329 return PTR_ERR(lu_gp_mem); 2330 2331 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2332 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2333 default_lu_gp); 2334 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2335 2336 pr_debug("%s: Adding to default ALUA LU Group:" 2337 " core/alua/lu_gps/default_lu_gp\n", 2338 dev->transport->name); 2339 } 2340 2341 return 0; 2342 } 2343