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, int explicit); 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, valid_states, 339 &primary, 1); 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_ALUA) 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, int explicit) 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 if (!(valid & ALUA_T_SUP) || explicit) 808 /* 809 * Transitioning is set internally and by tcmu daemon, 810 * and cannot be selected through a STPG. 811 */ 812 goto not_supported; 813 *primary = 0; 814 break; 815 default: 816 pr_err("Unknown ALUA access state: 0x%02x\n", state); 817 return TCM_INVALID_PARAMETER_LIST; 818 } 819 820 return 0; 821 822 not_supported: 823 pr_err("ALUA access state %s not supported", 824 core_alua_dump_state(state)); 825 return TCM_INVALID_PARAMETER_LIST; 826 } 827 828 static char *core_alua_dump_state(int state) 829 { 830 switch (state) { 831 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 832 return "Active/Optimized"; 833 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 834 return "Active/NonOptimized"; 835 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 836 return "LBA Dependent"; 837 case ALUA_ACCESS_STATE_STANDBY: 838 return "Standby"; 839 case ALUA_ACCESS_STATE_UNAVAILABLE: 840 return "Unavailable"; 841 case ALUA_ACCESS_STATE_OFFLINE: 842 return "Offline"; 843 case ALUA_ACCESS_STATE_TRANSITION: 844 return "Transitioning"; 845 default: 846 return "Unknown"; 847 } 848 849 return NULL; 850 } 851 852 char *core_alua_dump_status(int status) 853 { 854 switch (status) { 855 case ALUA_STATUS_NONE: 856 return "None"; 857 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 858 return "Altered by Explicit STPG"; 859 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 860 return "Altered by Implicit ALUA"; 861 default: 862 return "Unknown"; 863 } 864 865 return NULL; 866 } 867 868 /* 869 * Used by fabric modules to determine when we need to delay processing 870 * for the Active/NonOptimized paths.. 871 */ 872 int core_alua_check_nonop_delay( 873 struct se_cmd *cmd) 874 { 875 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 876 return 0; 877 if (in_interrupt()) 878 return 0; 879 /* 880 * The ALUA Active/NonOptimized access state delay can be disabled 881 * in via configfs with a value of zero 882 */ 883 if (!cmd->alua_nonop_delay) 884 return 0; 885 /* 886 * struct se_cmd->alua_nonop_delay gets set by a target port group 887 * defined interval in core_alua_state_nonoptimized() 888 */ 889 msleep_interruptible(cmd->alua_nonop_delay); 890 return 0; 891 } 892 EXPORT_SYMBOL(core_alua_check_nonop_delay); 893 894 static int core_alua_write_tpg_metadata( 895 const char *path, 896 unsigned char *md_buf, 897 u32 md_buf_len) 898 { 899 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 900 int ret; 901 902 if (IS_ERR(file)) { 903 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 904 return -ENODEV; 905 } 906 ret = kernel_write(file, md_buf, md_buf_len, 0); 907 if (ret < 0) 908 pr_err("Error writing ALUA metadata file: %s\n", path); 909 fput(file); 910 return (ret < 0) ? -EIO : 0; 911 } 912 913 /* 914 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 915 */ 916 static int core_alua_update_tpg_primary_metadata( 917 struct t10_alua_tg_pt_gp *tg_pt_gp) 918 { 919 unsigned char *md_buf; 920 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 921 char path[ALUA_METADATA_PATH_LEN]; 922 int len, rc; 923 924 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 925 if (!md_buf) { 926 pr_err("Unable to allocate buf for ALUA metadata\n"); 927 return -ENOMEM; 928 } 929 930 memset(path, 0, ALUA_METADATA_PATH_LEN); 931 932 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 933 "tg_pt_gp_id=%hu\n" 934 "alua_access_state=0x%02x\n" 935 "alua_access_status=0x%02x\n", 936 tg_pt_gp->tg_pt_gp_id, 937 tg_pt_gp->tg_pt_gp_alua_pending_state, 938 tg_pt_gp->tg_pt_gp_alua_access_status); 939 940 snprintf(path, ALUA_METADATA_PATH_LEN, 941 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0], 942 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 943 944 rc = core_alua_write_tpg_metadata(path, md_buf, len); 945 kfree(md_buf); 946 return rc; 947 } 948 949 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) 950 { 951 struct se_dev_entry *se_deve; 952 struct se_lun *lun; 953 struct se_lun_acl *lacl; 954 955 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 956 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 957 lun_tg_pt_gp_link) { 958 /* 959 * After an implicit target port asymmetric access state 960 * change, a device server shall establish a unit attention 961 * condition for the initiator port associated with every I_T 962 * nexus with the additional sense code set to ASYMMETRIC 963 * ACCESS STATE CHANGED. 964 * 965 * After an explicit target port asymmetric access state 966 * change, a device server shall establish a unit attention 967 * condition with the additional sense code set to ASYMMETRIC 968 * ACCESS STATE CHANGED for the initiator port associated with 969 * every I_T nexus other than the I_T nexus on which the SET 970 * TARGET PORT GROUPS command 971 */ 972 if (!percpu_ref_tryget_live(&lun->lun_ref)) 973 continue; 974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 975 976 spin_lock(&lun->lun_deve_lock); 977 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { 978 lacl = rcu_dereference_check(se_deve->se_lun_acl, 979 lockdep_is_held(&lun->lun_deve_lock)); 980 981 /* 982 * spc4r37 p.242: 983 * After an explicit target port asymmetric access 984 * state change, a device server shall establish a 985 * unit attention condition with the additional sense 986 * code set to ASYMMETRIC ACCESS STATE CHANGED for 987 * the initiator port associated with every I_T nexus 988 * other than the I_T nexus on which the SET TARGET 989 * PORT GROUPS command was received. 990 */ 991 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 992 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 993 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && 994 (tg_pt_gp->tg_pt_gp_alua_lun == lun)) 995 continue; 996 997 /* 998 * se_deve->se_lun_acl pointer may be NULL for a 999 * entry created without explicit Node+MappedLUN ACLs 1000 */ 1001 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 1002 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) 1003 continue; 1004 1005 core_scsi3_ua_allocate(se_deve, 0x2A, 1006 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1007 } 1008 spin_unlock(&lun->lun_deve_lock); 1009 1010 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1011 percpu_ref_put(&lun->lun_ref); 1012 } 1013 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1014 } 1015 1016 static void core_alua_do_transition_tg_pt_work(struct work_struct *work) 1017 { 1018 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, 1019 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work); 1020 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1021 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == 1022 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); 1023 1024 /* 1025 * Update the ALUA metadata buf that has been allocated in 1026 * core_alua_do_port_transition(), this metadata will be written 1027 * to struct file. 1028 * 1029 * Note that there is the case where we do not want to update the 1030 * metadata when the saved metadata is being parsed in userspace 1031 * when setting the existing port access state and access status. 1032 * 1033 * Also note that the failure to write out the ALUA metadata to 1034 * struct file does NOT affect the actual ALUA transition. 1035 */ 1036 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1037 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1038 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1039 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1040 } 1041 /* 1042 * Set the current primary ALUA access state to the requested new state 1043 */ 1044 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1045 tg_pt_gp->tg_pt_gp_alua_pending_state); 1046 1047 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1048 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1049 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1050 tg_pt_gp->tg_pt_gp_id, 1051 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1052 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1053 1054 core_alua_queue_state_change_ua(tg_pt_gp); 1055 1056 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1057 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1058 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1059 1060 if (tg_pt_gp->tg_pt_gp_transition_complete) 1061 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1062 } 1063 1064 static int core_alua_do_transition_tg_pt( 1065 struct t10_alua_tg_pt_gp *tg_pt_gp, 1066 int new_state, 1067 int explicit) 1068 { 1069 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1070 DECLARE_COMPLETION_ONSTACK(wait); 1071 1072 /* Nothing to be done here */ 1073 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1074 return 0; 1075 1076 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) 1077 return -EAGAIN; 1078 1079 /* 1080 * Flush any pending transitions 1081 */ 1082 if (!explicit && atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1083 ALUA_ACCESS_STATE_TRANSITION) { 1084 /* Just in case */ 1085 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1086 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1087 flush_work(&tg_pt_gp->tg_pt_gp_transition_work); 1088 wait_for_completion(&wait); 1089 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1090 return 0; 1091 } 1092 1093 /* 1094 * Save the old primary ALUA access state, and set the current state 1095 * to ALUA_ACCESS_STATE_TRANSITION. 1096 */ 1097 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1098 ALUA_ACCESS_STATE_TRANSITION); 1099 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1100 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1101 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1102 1103 core_alua_queue_state_change_ua(tg_pt_gp); 1104 1105 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1106 return 0; 1107 1108 tg_pt_gp->tg_pt_gp_alua_previous_state = 1109 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1110 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1111 1112 /* 1113 * Check for the optional ALUA primary state transition delay 1114 */ 1115 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1116 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1117 1118 /* 1119 * Take a reference for workqueue item 1120 */ 1121 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1122 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1123 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1124 1125 schedule_work(&tg_pt_gp->tg_pt_gp_transition_work); 1126 if (explicit) { 1127 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 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 if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 1150 return -ENODEV; 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, 1154 explicit) != 0) 1155 return -EINVAL; 1156 1157 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1158 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1159 lu_gp = local_lu_gp_mem->lu_gp; 1160 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1161 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1162 /* 1163 * For storage objects that are members of the 'default_lu_gp', 1164 * we only do transition on the passed *l_tp_pt_gp, and not 1165 * on all of the matching target port groups IDs in default_lu_gp. 1166 */ 1167 if (!lu_gp->lu_gp_id) { 1168 /* 1169 * core_alua_do_transition_tg_pt() will always return 1170 * success. 1171 */ 1172 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1173 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1174 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1175 new_state, explicit); 1176 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1177 return rc; 1178 } 1179 /* 1180 * For all other LU groups aside from 'default_lu_gp', walk all of 1181 * the associated storage objects looking for a matching target port 1182 * group ID from the local target port group. 1183 */ 1184 spin_lock(&lu_gp->lu_gp_lock); 1185 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1186 lu_gp_mem_list) { 1187 1188 dev = lu_gp_mem->lu_gp_mem_dev; 1189 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1190 spin_unlock(&lu_gp->lu_gp_lock); 1191 1192 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1193 list_for_each_entry(tg_pt_gp, 1194 &dev->t10_alua.tg_pt_gps_list, 1195 tg_pt_gp_list) { 1196 1197 if (!tg_pt_gp->tg_pt_gp_valid_id) 1198 continue; 1199 /* 1200 * If the target behavior port asymmetric access state 1201 * is changed for any target port group accessible via 1202 * a logical unit within a LU group, the target port 1203 * behavior group asymmetric access states for the same 1204 * target port group accessible via other logical units 1205 * in that LU group will also change. 1206 */ 1207 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1208 continue; 1209 1210 if (l_tg_pt_gp == tg_pt_gp) { 1211 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1212 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1213 } else { 1214 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1215 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1216 } 1217 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1218 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1219 /* 1220 * core_alua_do_transition_tg_pt() will always return 1221 * success. 1222 */ 1223 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1224 new_state, explicit); 1225 1226 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1227 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1228 if (rc) 1229 break; 1230 } 1231 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1232 1233 spin_lock(&lu_gp->lu_gp_lock); 1234 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1235 } 1236 spin_unlock(&lu_gp->lu_gp_lock); 1237 1238 if (!rc) { 1239 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1240 " Group IDs: %hu %s transition to primary state: %s\n", 1241 config_item_name(&lu_gp->lu_gp_group.cg_item), 1242 l_tg_pt_gp->tg_pt_gp_id, 1243 (explicit) ? "explicit" : "implicit", 1244 core_alua_dump_state(new_state)); 1245 } 1246 1247 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1248 return rc; 1249 } 1250 1251 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1252 { 1253 struct se_portal_group *se_tpg = lun->lun_tpg; 1254 unsigned char *md_buf; 1255 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1256 int len, rc; 1257 1258 mutex_lock(&lun->lun_tg_pt_md_mutex); 1259 1260 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1261 if (!md_buf) { 1262 pr_err("Unable to allocate buf for ALUA metadata\n"); 1263 rc = -ENOMEM; 1264 goto out_unlock; 1265 } 1266 1267 memset(path, 0, ALUA_METADATA_PATH_LEN); 1268 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1269 1270 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1271 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1272 1273 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1274 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1275 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1276 1277 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1278 "alua_tg_pt_status=0x%02x\n", 1279 atomic_read(&lun->lun_tg_pt_secondary_offline), 1280 lun->lun_tg_pt_secondary_stat); 1281 1282 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu", 1283 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1284 lun->unpacked_lun); 1285 1286 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1287 kfree(md_buf); 1288 1289 out_unlock: 1290 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1291 return rc; 1292 } 1293 1294 static int core_alua_set_tg_pt_secondary_state( 1295 struct se_lun *lun, 1296 int explicit, 1297 int offline) 1298 { 1299 struct t10_alua_tg_pt_gp *tg_pt_gp; 1300 int trans_delay_msecs; 1301 1302 spin_lock(&lun->lun_tg_pt_gp_lock); 1303 tg_pt_gp = lun->lun_tg_pt_gp; 1304 if (!tg_pt_gp) { 1305 spin_unlock(&lun->lun_tg_pt_gp_lock); 1306 pr_err("Unable to complete secondary state" 1307 " transition\n"); 1308 return -EINVAL; 1309 } 1310 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1311 /* 1312 * Set the secondary ALUA target port access state to OFFLINE 1313 * or release the previously secondary state for struct se_lun 1314 */ 1315 if (offline) 1316 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1317 else 1318 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1319 1320 lun->lun_tg_pt_secondary_stat = (explicit) ? 1321 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1322 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1323 1324 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1325 " to secondary access state: %s\n", (explicit) ? "explicit" : 1326 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1327 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1328 1329 spin_unlock(&lun->lun_tg_pt_gp_lock); 1330 /* 1331 * Do the optional transition delay after we set the secondary 1332 * ALUA access state. 1333 */ 1334 if (trans_delay_msecs != 0) 1335 msleep_interruptible(trans_delay_msecs); 1336 /* 1337 * See if we need to update the ALUA fabric port metadata for 1338 * secondary state and status 1339 */ 1340 if (lun->lun_tg_pt_secondary_write_md) 1341 core_alua_update_tpg_secondary_metadata(lun); 1342 1343 return 0; 1344 } 1345 1346 struct t10_alua_lba_map * 1347 core_alua_allocate_lba_map(struct list_head *list, 1348 u64 first_lba, u64 last_lba) 1349 { 1350 struct t10_alua_lba_map *lba_map; 1351 1352 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1353 if (!lba_map) { 1354 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1355 return ERR_PTR(-ENOMEM); 1356 } 1357 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1358 lba_map->lba_map_first_lba = first_lba; 1359 lba_map->lba_map_last_lba = last_lba; 1360 1361 list_add_tail(&lba_map->lba_map_list, list); 1362 return lba_map; 1363 } 1364 1365 int 1366 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1367 int pg_id, int state) 1368 { 1369 struct t10_alua_lba_map_member *lba_map_mem; 1370 1371 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1372 lba_map_mem_list) { 1373 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1374 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1375 return -EINVAL; 1376 } 1377 } 1378 1379 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1380 if (!lba_map_mem) { 1381 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1382 return -ENOMEM; 1383 } 1384 lba_map_mem->lba_map_mem_alua_state = state; 1385 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1386 1387 list_add_tail(&lba_map_mem->lba_map_mem_list, 1388 &lba_map->lba_map_mem_list); 1389 return 0; 1390 } 1391 1392 void 1393 core_alua_free_lba_map(struct list_head *lba_list) 1394 { 1395 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1396 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1397 1398 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1399 lba_map_list) { 1400 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1401 &lba_map->lba_map_mem_list, 1402 lba_map_mem_list) { 1403 list_del(&lba_map_mem->lba_map_mem_list); 1404 kmem_cache_free(t10_alua_lba_map_mem_cache, 1405 lba_map_mem); 1406 } 1407 list_del(&lba_map->lba_map_list); 1408 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1409 } 1410 } 1411 1412 void 1413 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1414 int segment_size, int segment_mult) 1415 { 1416 struct list_head old_lba_map_list; 1417 struct t10_alua_tg_pt_gp *tg_pt_gp; 1418 int activate = 0, supported; 1419 1420 INIT_LIST_HEAD(&old_lba_map_list); 1421 spin_lock(&dev->t10_alua.lba_map_lock); 1422 dev->t10_alua.lba_map_segment_size = segment_size; 1423 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1424 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1425 if (lba_map_list) { 1426 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1427 activate = 1; 1428 } 1429 spin_unlock(&dev->t10_alua.lba_map_lock); 1430 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1431 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1432 tg_pt_gp_list) { 1433 1434 if (!tg_pt_gp->tg_pt_gp_valid_id) 1435 continue; 1436 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1437 if (activate) 1438 supported |= ALUA_LBD_SUP; 1439 else 1440 supported &= ~ALUA_LBD_SUP; 1441 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1442 } 1443 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1444 core_alua_free_lba_map(&old_lba_map_list); 1445 } 1446 1447 struct t10_alua_lu_gp * 1448 core_alua_allocate_lu_gp(const char *name, int def_group) 1449 { 1450 struct t10_alua_lu_gp *lu_gp; 1451 1452 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1453 if (!lu_gp) { 1454 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1455 return ERR_PTR(-ENOMEM); 1456 } 1457 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1458 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1459 spin_lock_init(&lu_gp->lu_gp_lock); 1460 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1461 1462 if (def_group) { 1463 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1464 lu_gp->lu_gp_valid_id = 1; 1465 alua_lu_gps_count++; 1466 } 1467 1468 return lu_gp; 1469 } 1470 1471 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1472 { 1473 struct t10_alua_lu_gp *lu_gp_tmp; 1474 u16 lu_gp_id_tmp; 1475 /* 1476 * The lu_gp->lu_gp_id may only be set once.. 1477 */ 1478 if (lu_gp->lu_gp_valid_id) { 1479 pr_warn("ALUA LU Group already has a valid ID," 1480 " ignoring request\n"); 1481 return -EINVAL; 1482 } 1483 1484 spin_lock(&lu_gps_lock); 1485 if (alua_lu_gps_count == 0x0000ffff) { 1486 pr_err("Maximum ALUA alua_lu_gps_count:" 1487 " 0x0000ffff reached\n"); 1488 spin_unlock(&lu_gps_lock); 1489 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1490 return -ENOSPC; 1491 } 1492 again: 1493 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1494 alua_lu_gps_counter++; 1495 1496 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1497 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1498 if (!lu_gp_id) 1499 goto again; 1500 1501 pr_warn("ALUA Logical Unit Group ID: %hu" 1502 " already exists, ignoring request\n", 1503 lu_gp_id); 1504 spin_unlock(&lu_gps_lock); 1505 return -EINVAL; 1506 } 1507 } 1508 1509 lu_gp->lu_gp_id = lu_gp_id_tmp; 1510 lu_gp->lu_gp_valid_id = 1; 1511 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1512 alua_lu_gps_count++; 1513 spin_unlock(&lu_gps_lock); 1514 1515 return 0; 1516 } 1517 1518 static struct t10_alua_lu_gp_member * 1519 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1520 { 1521 struct t10_alua_lu_gp_member *lu_gp_mem; 1522 1523 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1524 if (!lu_gp_mem) { 1525 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1526 return ERR_PTR(-ENOMEM); 1527 } 1528 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1529 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1530 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1531 1532 lu_gp_mem->lu_gp_mem_dev = dev; 1533 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1534 1535 return lu_gp_mem; 1536 } 1537 1538 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1539 { 1540 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1541 /* 1542 * Once we have reached this point, config_item_put() has 1543 * already been called from target_core_alua_drop_lu_gp(). 1544 * 1545 * Here, we remove the *lu_gp from the global list so that 1546 * no associations can be made while we are releasing 1547 * struct t10_alua_lu_gp. 1548 */ 1549 spin_lock(&lu_gps_lock); 1550 list_del(&lu_gp->lu_gp_node); 1551 alua_lu_gps_count--; 1552 spin_unlock(&lu_gps_lock); 1553 /* 1554 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1555 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1556 * released with core_alua_put_lu_gp_from_name() 1557 */ 1558 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1559 cpu_relax(); 1560 /* 1561 * Release reference to struct t10_alua_lu_gp * from all associated 1562 * struct se_device. 1563 */ 1564 spin_lock(&lu_gp->lu_gp_lock); 1565 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1566 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1567 if (lu_gp_mem->lu_gp_assoc) { 1568 list_del(&lu_gp_mem->lu_gp_mem_list); 1569 lu_gp->lu_gp_members--; 1570 lu_gp_mem->lu_gp_assoc = 0; 1571 } 1572 spin_unlock(&lu_gp->lu_gp_lock); 1573 /* 1574 * 1575 * lu_gp_mem is associated with a single 1576 * struct se_device->dev_alua_lu_gp_mem, and is released when 1577 * struct se_device is released via core_alua_free_lu_gp_mem(). 1578 * 1579 * If the passed lu_gp does NOT match the default_lu_gp, assume 1580 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1581 */ 1582 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1583 if (lu_gp != default_lu_gp) 1584 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1585 default_lu_gp); 1586 else 1587 lu_gp_mem->lu_gp = NULL; 1588 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1589 1590 spin_lock(&lu_gp->lu_gp_lock); 1591 } 1592 spin_unlock(&lu_gp->lu_gp_lock); 1593 1594 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1595 } 1596 1597 void core_alua_free_lu_gp_mem(struct se_device *dev) 1598 { 1599 struct t10_alua_lu_gp *lu_gp; 1600 struct t10_alua_lu_gp_member *lu_gp_mem; 1601 1602 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1603 if (!lu_gp_mem) 1604 return; 1605 1606 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1607 cpu_relax(); 1608 1609 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1610 lu_gp = lu_gp_mem->lu_gp; 1611 if (lu_gp) { 1612 spin_lock(&lu_gp->lu_gp_lock); 1613 if (lu_gp_mem->lu_gp_assoc) { 1614 list_del(&lu_gp_mem->lu_gp_mem_list); 1615 lu_gp->lu_gp_members--; 1616 lu_gp_mem->lu_gp_assoc = 0; 1617 } 1618 spin_unlock(&lu_gp->lu_gp_lock); 1619 lu_gp_mem->lu_gp = NULL; 1620 } 1621 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1622 1623 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1624 } 1625 1626 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1627 { 1628 struct t10_alua_lu_gp *lu_gp; 1629 struct config_item *ci; 1630 1631 spin_lock(&lu_gps_lock); 1632 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1633 if (!lu_gp->lu_gp_valid_id) 1634 continue; 1635 ci = &lu_gp->lu_gp_group.cg_item; 1636 if (!strcmp(config_item_name(ci), name)) { 1637 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1638 spin_unlock(&lu_gps_lock); 1639 return lu_gp; 1640 } 1641 } 1642 spin_unlock(&lu_gps_lock); 1643 1644 return NULL; 1645 } 1646 1647 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1648 { 1649 spin_lock(&lu_gps_lock); 1650 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1651 spin_unlock(&lu_gps_lock); 1652 } 1653 1654 /* 1655 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1656 */ 1657 void __core_alua_attach_lu_gp_mem( 1658 struct t10_alua_lu_gp_member *lu_gp_mem, 1659 struct t10_alua_lu_gp *lu_gp) 1660 { 1661 spin_lock(&lu_gp->lu_gp_lock); 1662 lu_gp_mem->lu_gp = lu_gp; 1663 lu_gp_mem->lu_gp_assoc = 1; 1664 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1665 lu_gp->lu_gp_members++; 1666 spin_unlock(&lu_gp->lu_gp_lock); 1667 } 1668 1669 /* 1670 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1671 */ 1672 void __core_alua_drop_lu_gp_mem( 1673 struct t10_alua_lu_gp_member *lu_gp_mem, 1674 struct t10_alua_lu_gp *lu_gp) 1675 { 1676 spin_lock(&lu_gp->lu_gp_lock); 1677 list_del(&lu_gp_mem->lu_gp_mem_list); 1678 lu_gp_mem->lu_gp = NULL; 1679 lu_gp_mem->lu_gp_assoc = 0; 1680 lu_gp->lu_gp_members--; 1681 spin_unlock(&lu_gp->lu_gp_lock); 1682 } 1683 1684 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1685 const char *name, int def_group) 1686 { 1687 struct t10_alua_tg_pt_gp *tg_pt_gp; 1688 1689 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1690 if (!tg_pt_gp) { 1691 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1692 return NULL; 1693 } 1694 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1695 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1696 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1697 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1698 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1699 INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1700 core_alua_do_transition_tg_pt_work); 1701 tg_pt_gp->tg_pt_gp_dev = dev; 1702 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1703 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1704 /* 1705 * Enable both explicit and implicit ALUA support by default 1706 */ 1707 tg_pt_gp->tg_pt_gp_alua_access_type = 1708 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1709 /* 1710 * Set the default Active/NonOptimized Delay in milliseconds 1711 */ 1712 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1713 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1714 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1715 1716 /* 1717 * Enable all supported states 1718 */ 1719 tg_pt_gp->tg_pt_gp_alua_supported_states = 1720 ALUA_T_SUP | ALUA_O_SUP | 1721 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1722 1723 if (def_group) { 1724 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1725 tg_pt_gp->tg_pt_gp_id = 1726 dev->t10_alua.alua_tg_pt_gps_counter++; 1727 tg_pt_gp->tg_pt_gp_valid_id = 1; 1728 dev->t10_alua.alua_tg_pt_gps_count++; 1729 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1730 &dev->t10_alua.tg_pt_gps_list); 1731 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1732 } 1733 1734 return tg_pt_gp; 1735 } 1736 1737 int core_alua_set_tg_pt_gp_id( 1738 struct t10_alua_tg_pt_gp *tg_pt_gp, 1739 u16 tg_pt_gp_id) 1740 { 1741 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1742 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1743 u16 tg_pt_gp_id_tmp; 1744 1745 /* 1746 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1747 */ 1748 if (tg_pt_gp->tg_pt_gp_valid_id) { 1749 pr_warn("ALUA TG PT Group already has a valid ID," 1750 " ignoring request\n"); 1751 return -EINVAL; 1752 } 1753 1754 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1755 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1756 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1757 " 0x0000ffff reached\n"); 1758 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1759 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1760 return -ENOSPC; 1761 } 1762 again: 1763 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1764 dev->t10_alua.alua_tg_pt_gps_counter++; 1765 1766 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1767 tg_pt_gp_list) { 1768 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1769 if (!tg_pt_gp_id) 1770 goto again; 1771 1772 pr_err("ALUA Target Port Group ID: %hu already" 1773 " exists, ignoring request\n", tg_pt_gp_id); 1774 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1775 return -EINVAL; 1776 } 1777 } 1778 1779 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1780 tg_pt_gp->tg_pt_gp_valid_id = 1; 1781 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1782 &dev->t10_alua.tg_pt_gps_list); 1783 dev->t10_alua.alua_tg_pt_gps_count++; 1784 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1785 1786 return 0; 1787 } 1788 1789 void core_alua_free_tg_pt_gp( 1790 struct t10_alua_tg_pt_gp *tg_pt_gp) 1791 { 1792 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1793 struct se_lun *lun, *next; 1794 1795 /* 1796 * Once we have reached this point, config_item_put() has already 1797 * been called from target_core_alua_drop_tg_pt_gp(). 1798 * 1799 * Here we remove *tg_pt_gp from the global list so that 1800 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1801 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1802 */ 1803 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1804 list_del(&tg_pt_gp->tg_pt_gp_list); 1805 dev->t10_alua.alua_tg_pt_gps_counter--; 1806 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1807 1808 flush_work(&tg_pt_gp->tg_pt_gp_transition_work); 1809 1810 /* 1811 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1812 * core_alua_get_tg_pt_gp_by_name() in 1813 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1814 * to be released with core_alua_put_tg_pt_gp_from_name(). 1815 */ 1816 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1817 cpu_relax(); 1818 1819 /* 1820 * Release reference to struct t10_alua_tg_pt_gp from all associated 1821 * struct se_port. 1822 */ 1823 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1824 list_for_each_entry_safe(lun, next, 1825 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1826 list_del_init(&lun->lun_tg_pt_gp_link); 1827 tg_pt_gp->tg_pt_gp_members--; 1828 1829 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1830 /* 1831 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1832 * assume we want to re-associate a given tg_pt_gp_mem with 1833 * default_tg_pt_gp. 1834 */ 1835 spin_lock(&lun->lun_tg_pt_gp_lock); 1836 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1837 __target_attach_tg_pt_gp(lun, 1838 dev->t10_alua.default_tg_pt_gp); 1839 } else 1840 lun->lun_tg_pt_gp = NULL; 1841 spin_unlock(&lun->lun_tg_pt_gp_lock); 1842 1843 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1844 } 1845 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1846 1847 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1848 } 1849 1850 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1851 struct se_device *dev, const char *name) 1852 { 1853 struct t10_alua_tg_pt_gp *tg_pt_gp; 1854 struct config_item *ci; 1855 1856 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1857 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1858 tg_pt_gp_list) { 1859 if (!tg_pt_gp->tg_pt_gp_valid_id) 1860 continue; 1861 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1862 if (!strcmp(config_item_name(ci), name)) { 1863 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1864 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1865 return tg_pt_gp; 1866 } 1867 } 1868 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1869 1870 return NULL; 1871 } 1872 1873 static void core_alua_put_tg_pt_gp_from_name( 1874 struct t10_alua_tg_pt_gp *tg_pt_gp) 1875 { 1876 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1877 1878 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1879 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1880 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1881 } 1882 1883 static void __target_attach_tg_pt_gp(struct se_lun *lun, 1884 struct t10_alua_tg_pt_gp *tg_pt_gp) 1885 { 1886 struct se_dev_entry *se_deve; 1887 1888 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1889 1890 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1891 lun->lun_tg_pt_gp = tg_pt_gp; 1892 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1893 tg_pt_gp->tg_pt_gp_members++; 1894 spin_lock(&lun->lun_deve_lock); 1895 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1896 core_scsi3_ua_allocate(se_deve, 0x3f, 1897 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1898 spin_unlock(&lun->lun_deve_lock); 1899 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1900 } 1901 1902 void target_attach_tg_pt_gp(struct se_lun *lun, 1903 struct t10_alua_tg_pt_gp *tg_pt_gp) 1904 { 1905 spin_lock(&lun->lun_tg_pt_gp_lock); 1906 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1907 spin_unlock(&lun->lun_tg_pt_gp_lock); 1908 } 1909 1910 static void __target_detach_tg_pt_gp(struct se_lun *lun, 1911 struct t10_alua_tg_pt_gp *tg_pt_gp) 1912 { 1913 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1914 1915 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1916 list_del_init(&lun->lun_tg_pt_gp_link); 1917 tg_pt_gp->tg_pt_gp_members--; 1918 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1919 1920 lun->lun_tg_pt_gp = NULL; 1921 } 1922 1923 void target_detach_tg_pt_gp(struct se_lun *lun) 1924 { 1925 struct t10_alua_tg_pt_gp *tg_pt_gp; 1926 1927 spin_lock(&lun->lun_tg_pt_gp_lock); 1928 tg_pt_gp = lun->lun_tg_pt_gp; 1929 if (tg_pt_gp) 1930 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1931 spin_unlock(&lun->lun_tg_pt_gp_lock); 1932 } 1933 1934 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1935 { 1936 struct config_item *tg_pt_ci; 1937 struct t10_alua_tg_pt_gp *tg_pt_gp; 1938 ssize_t len = 0; 1939 1940 spin_lock(&lun->lun_tg_pt_gp_lock); 1941 tg_pt_gp = lun->lun_tg_pt_gp; 1942 if (tg_pt_gp) { 1943 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1944 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1945 " %hu\nTG Port Primary Access State: %s\nTG Port " 1946 "Primary Access Status: %s\nTG Port Secondary Access" 1947 " State: %s\nTG Port Secondary Access Status: %s\n", 1948 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1949 core_alua_dump_state(atomic_read( 1950 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1951 core_alua_dump_status( 1952 tg_pt_gp->tg_pt_gp_alua_access_status), 1953 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1954 "Offline" : "None", 1955 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1956 } 1957 spin_unlock(&lun->lun_tg_pt_gp_lock); 1958 1959 return len; 1960 } 1961 1962 ssize_t core_alua_store_tg_pt_gp_info( 1963 struct se_lun *lun, 1964 const char *page, 1965 size_t count) 1966 { 1967 struct se_portal_group *tpg = lun->lun_tpg; 1968 /* 1969 * rcu_dereference_raw protected by se_lun->lun_group symlink 1970 * reference to se_device->dev_group. 1971 */ 1972 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1973 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1974 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1975 int move = 0; 1976 1977 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 1978 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1979 return -ENODEV; 1980 1981 if (count > TG_PT_GROUP_NAME_BUF) { 1982 pr_err("ALUA Target Port Group alias too large!\n"); 1983 return -EINVAL; 1984 } 1985 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1986 memcpy(buf, page, count); 1987 /* 1988 * Any ALUA target port group alias besides "NULL" means we will be 1989 * making a new group association. 1990 */ 1991 if (strcmp(strstrip(buf), "NULL")) { 1992 /* 1993 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1994 * struct t10_alua_tg_pt_gp. This reference is released with 1995 * core_alua_put_tg_pt_gp_from_name() below. 1996 */ 1997 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1998 strstrip(buf)); 1999 if (!tg_pt_gp_new) 2000 return -ENODEV; 2001 } 2002 2003 spin_lock(&lun->lun_tg_pt_gp_lock); 2004 tg_pt_gp = lun->lun_tg_pt_gp; 2005 if (tg_pt_gp) { 2006 /* 2007 * Clearing an existing tg_pt_gp association, and replacing 2008 * with the default_tg_pt_gp. 2009 */ 2010 if (!tg_pt_gp_new) { 2011 pr_debug("Target_Core_ConfigFS: Moving" 2012 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2013 " alua/%s, ID: %hu back to" 2014 " default_tg_pt_gp\n", 2015 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2016 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2017 config_item_name(&lun->lun_group.cg_item), 2018 config_item_name( 2019 &tg_pt_gp->tg_pt_gp_group.cg_item), 2020 tg_pt_gp->tg_pt_gp_id); 2021 2022 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2023 __target_attach_tg_pt_gp(lun, 2024 dev->t10_alua.default_tg_pt_gp); 2025 spin_unlock(&lun->lun_tg_pt_gp_lock); 2026 2027 return count; 2028 } 2029 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2030 move = 1; 2031 } 2032 2033 __target_attach_tg_pt_gp(lun, tg_pt_gp_new); 2034 spin_unlock(&lun->lun_tg_pt_gp_lock); 2035 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2036 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2037 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2038 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2039 config_item_name(&lun->lun_group.cg_item), 2040 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2041 tg_pt_gp_new->tg_pt_gp_id); 2042 2043 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2044 return count; 2045 } 2046 2047 ssize_t core_alua_show_access_type( 2048 struct t10_alua_tg_pt_gp *tg_pt_gp, 2049 char *page) 2050 { 2051 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2052 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2053 return sprintf(page, "Implicit and Explicit\n"); 2054 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2055 return sprintf(page, "Implicit\n"); 2056 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2057 return sprintf(page, "Explicit\n"); 2058 else 2059 return sprintf(page, "None\n"); 2060 } 2061 2062 ssize_t core_alua_store_access_type( 2063 struct t10_alua_tg_pt_gp *tg_pt_gp, 2064 const char *page, 2065 size_t count) 2066 { 2067 unsigned long tmp; 2068 int ret; 2069 2070 ret = kstrtoul(page, 0, &tmp); 2071 if (ret < 0) { 2072 pr_err("Unable to extract alua_access_type\n"); 2073 return ret; 2074 } 2075 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2076 pr_err("Illegal value for alua_access_type:" 2077 " %lu\n", tmp); 2078 return -EINVAL; 2079 } 2080 if (tmp == 3) 2081 tg_pt_gp->tg_pt_gp_alua_access_type = 2082 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2083 else if (tmp == 2) 2084 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2085 else if (tmp == 1) 2086 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2087 else 2088 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2089 2090 return count; 2091 } 2092 2093 ssize_t core_alua_show_nonop_delay_msecs( 2094 struct t10_alua_tg_pt_gp *tg_pt_gp, 2095 char *page) 2096 { 2097 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2098 } 2099 2100 ssize_t core_alua_store_nonop_delay_msecs( 2101 struct t10_alua_tg_pt_gp *tg_pt_gp, 2102 const char *page, 2103 size_t count) 2104 { 2105 unsigned long tmp; 2106 int ret; 2107 2108 ret = kstrtoul(page, 0, &tmp); 2109 if (ret < 0) { 2110 pr_err("Unable to extract nonop_delay_msecs\n"); 2111 return ret; 2112 } 2113 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2114 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2115 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2116 ALUA_MAX_NONOP_DELAY_MSECS); 2117 return -EINVAL; 2118 } 2119 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2120 2121 return count; 2122 } 2123 2124 ssize_t core_alua_show_trans_delay_msecs( 2125 struct t10_alua_tg_pt_gp *tg_pt_gp, 2126 char *page) 2127 { 2128 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2129 } 2130 2131 ssize_t core_alua_store_trans_delay_msecs( 2132 struct t10_alua_tg_pt_gp *tg_pt_gp, 2133 const char *page, 2134 size_t count) 2135 { 2136 unsigned long tmp; 2137 int ret; 2138 2139 ret = kstrtoul(page, 0, &tmp); 2140 if (ret < 0) { 2141 pr_err("Unable to extract trans_delay_msecs\n"); 2142 return ret; 2143 } 2144 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2145 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2146 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2147 ALUA_MAX_TRANS_DELAY_MSECS); 2148 return -EINVAL; 2149 } 2150 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2151 2152 return count; 2153 } 2154 2155 ssize_t core_alua_show_implicit_trans_secs( 2156 struct t10_alua_tg_pt_gp *tg_pt_gp, 2157 char *page) 2158 { 2159 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2160 } 2161 2162 ssize_t core_alua_store_implicit_trans_secs( 2163 struct t10_alua_tg_pt_gp *tg_pt_gp, 2164 const char *page, 2165 size_t count) 2166 { 2167 unsigned long tmp; 2168 int ret; 2169 2170 ret = kstrtoul(page, 0, &tmp); 2171 if (ret < 0) { 2172 pr_err("Unable to extract implicit_trans_secs\n"); 2173 return ret; 2174 } 2175 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2176 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2177 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2178 ALUA_MAX_IMPLICIT_TRANS_SECS); 2179 return -EINVAL; 2180 } 2181 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2182 2183 return count; 2184 } 2185 2186 ssize_t core_alua_show_preferred_bit( 2187 struct t10_alua_tg_pt_gp *tg_pt_gp, 2188 char *page) 2189 { 2190 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2191 } 2192 2193 ssize_t core_alua_store_preferred_bit( 2194 struct t10_alua_tg_pt_gp *tg_pt_gp, 2195 const char *page, 2196 size_t count) 2197 { 2198 unsigned long tmp; 2199 int ret; 2200 2201 ret = kstrtoul(page, 0, &tmp); 2202 if (ret < 0) { 2203 pr_err("Unable to extract preferred ALUA value\n"); 2204 return ret; 2205 } 2206 if ((tmp != 0) && (tmp != 1)) { 2207 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2208 return -EINVAL; 2209 } 2210 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2211 2212 return count; 2213 } 2214 2215 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2216 { 2217 return sprintf(page, "%d\n", 2218 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2219 } 2220 2221 ssize_t core_alua_store_offline_bit( 2222 struct se_lun *lun, 2223 const char *page, 2224 size_t count) 2225 { 2226 /* 2227 * rcu_dereference_raw protected by se_lun->lun_group symlink 2228 * reference to se_device->dev_group. 2229 */ 2230 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2231 unsigned long tmp; 2232 int ret; 2233 2234 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 2235 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2236 return -ENODEV; 2237 2238 ret = kstrtoul(page, 0, &tmp); 2239 if (ret < 0) { 2240 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2241 return ret; 2242 } 2243 if ((tmp != 0) && (tmp != 1)) { 2244 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2245 tmp); 2246 return -EINVAL; 2247 } 2248 2249 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2250 if (ret < 0) 2251 return -EINVAL; 2252 2253 return count; 2254 } 2255 2256 ssize_t core_alua_show_secondary_status( 2257 struct se_lun *lun, 2258 char *page) 2259 { 2260 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2261 } 2262 2263 ssize_t core_alua_store_secondary_status( 2264 struct se_lun *lun, 2265 const char *page, 2266 size_t count) 2267 { 2268 unsigned long tmp; 2269 int ret; 2270 2271 ret = kstrtoul(page, 0, &tmp); 2272 if (ret < 0) { 2273 pr_err("Unable to extract alua_tg_pt_status\n"); 2274 return ret; 2275 } 2276 if ((tmp != ALUA_STATUS_NONE) && 2277 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2278 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2279 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2280 tmp); 2281 return -EINVAL; 2282 } 2283 lun->lun_tg_pt_secondary_stat = (int)tmp; 2284 2285 return count; 2286 } 2287 2288 ssize_t core_alua_show_secondary_write_metadata( 2289 struct se_lun *lun, 2290 char *page) 2291 { 2292 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2293 } 2294 2295 ssize_t core_alua_store_secondary_write_metadata( 2296 struct se_lun *lun, 2297 const char *page, 2298 size_t count) 2299 { 2300 unsigned long tmp; 2301 int ret; 2302 2303 ret = kstrtoul(page, 0, &tmp); 2304 if (ret < 0) { 2305 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2306 return ret; 2307 } 2308 if ((tmp != 0) && (tmp != 1)) { 2309 pr_err("Illegal value for alua_tg_pt_write_md:" 2310 " %lu\n", tmp); 2311 return -EINVAL; 2312 } 2313 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2314 2315 return count; 2316 } 2317 2318 int core_setup_alua(struct se_device *dev) 2319 { 2320 if (!(dev->transport->transport_flags & 2321 TRANSPORT_FLAG_PASSTHROUGH_ALUA) && 2322 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2323 struct t10_alua_lu_gp_member *lu_gp_mem; 2324 2325 /* 2326 * Associate this struct se_device with the default ALUA 2327 * LUN Group. 2328 */ 2329 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2330 if (IS_ERR(lu_gp_mem)) 2331 return PTR_ERR(lu_gp_mem); 2332 2333 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2334 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2335 default_lu_gp); 2336 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2337 2338 pr_debug("%s: Adding to default ALUA LU Group:" 2339 " core/alua/lu_gps/default_lu_gp\n", 2340 dev->transport->name); 2341 } 2342 2343 return 0; 2344 } 2345