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_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) 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); 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 && atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1080 ALUA_ACCESS_STATE_TRANSITION) { 1081 /* Just in case */ 1082 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1083 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1084 flush_work(&tg_pt_gp->tg_pt_gp_transition_work); 1085 wait_for_completion(&wait); 1086 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1087 return 0; 1088 } 1089 1090 /* 1091 * Save the old primary ALUA access state, and set the current state 1092 * to ALUA_ACCESS_STATE_TRANSITION. 1093 */ 1094 tg_pt_gp->tg_pt_gp_alua_previous_state = 1095 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1096 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1097 1098 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1099 ALUA_ACCESS_STATE_TRANSITION); 1100 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1101 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1102 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1103 1104 core_alua_queue_state_change_ua(tg_pt_gp); 1105 1106 /* 1107 * Check for the optional ALUA primary state transition delay 1108 */ 1109 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1110 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1111 1112 /* 1113 * Take a reference for workqueue item 1114 */ 1115 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1116 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1117 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1118 1119 schedule_work(&tg_pt_gp->tg_pt_gp_transition_work); 1120 if (explicit) { 1121 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1122 wait_for_completion(&wait); 1123 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1124 } 1125 1126 return 0; 1127 } 1128 1129 int core_alua_do_port_transition( 1130 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1131 struct se_device *l_dev, 1132 struct se_lun *l_lun, 1133 struct se_node_acl *l_nacl, 1134 int new_state, 1135 int explicit) 1136 { 1137 struct se_device *dev; 1138 struct t10_alua_lu_gp *lu_gp; 1139 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1140 struct t10_alua_tg_pt_gp *tg_pt_gp; 1141 int primary, valid_states, rc = 0; 1142 1143 if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 1144 return -ENODEV; 1145 1146 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1147 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1148 return -EINVAL; 1149 1150 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1151 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1152 lu_gp = local_lu_gp_mem->lu_gp; 1153 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1154 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1155 /* 1156 * For storage objects that are members of the 'default_lu_gp', 1157 * we only do transition on the passed *l_tp_pt_gp, and not 1158 * on all of the matching target port groups IDs in default_lu_gp. 1159 */ 1160 if (!lu_gp->lu_gp_id) { 1161 /* 1162 * core_alua_do_transition_tg_pt() will always return 1163 * success. 1164 */ 1165 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1166 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1167 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1168 new_state, explicit); 1169 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1170 return rc; 1171 } 1172 /* 1173 * For all other LU groups aside from 'default_lu_gp', walk all of 1174 * the associated storage objects looking for a matching target port 1175 * group ID from the local target port group. 1176 */ 1177 spin_lock(&lu_gp->lu_gp_lock); 1178 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1179 lu_gp_mem_list) { 1180 1181 dev = lu_gp_mem->lu_gp_mem_dev; 1182 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1183 spin_unlock(&lu_gp->lu_gp_lock); 1184 1185 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1186 list_for_each_entry(tg_pt_gp, 1187 &dev->t10_alua.tg_pt_gps_list, 1188 tg_pt_gp_list) { 1189 1190 if (!tg_pt_gp->tg_pt_gp_valid_id) 1191 continue; 1192 /* 1193 * If the target behavior port asymmetric access state 1194 * is changed for any target port group accessible via 1195 * a logical unit within a LU group, the target port 1196 * behavior group asymmetric access states for the same 1197 * target port group accessible via other logical units 1198 * in that LU group will also change. 1199 */ 1200 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1201 continue; 1202 1203 if (l_tg_pt_gp == tg_pt_gp) { 1204 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1205 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1206 } else { 1207 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1208 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1209 } 1210 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1211 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1212 /* 1213 * core_alua_do_transition_tg_pt() will always return 1214 * success. 1215 */ 1216 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1217 new_state, explicit); 1218 1219 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1220 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1221 if (rc) 1222 break; 1223 } 1224 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1225 1226 spin_lock(&lu_gp->lu_gp_lock); 1227 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1228 } 1229 spin_unlock(&lu_gp->lu_gp_lock); 1230 1231 if (!rc) { 1232 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1233 " Group IDs: %hu %s transition to primary state: %s\n", 1234 config_item_name(&lu_gp->lu_gp_group.cg_item), 1235 l_tg_pt_gp->tg_pt_gp_id, 1236 (explicit) ? "explicit" : "implicit", 1237 core_alua_dump_state(new_state)); 1238 } 1239 1240 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1241 return rc; 1242 } 1243 1244 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1245 { 1246 struct se_portal_group *se_tpg = lun->lun_tpg; 1247 unsigned char *md_buf; 1248 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1249 int len, rc; 1250 1251 mutex_lock(&lun->lun_tg_pt_md_mutex); 1252 1253 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1254 if (!md_buf) { 1255 pr_err("Unable to allocate buf for ALUA metadata\n"); 1256 rc = -ENOMEM; 1257 goto out_unlock; 1258 } 1259 1260 memset(path, 0, ALUA_METADATA_PATH_LEN); 1261 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1262 1263 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1264 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1265 1266 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1267 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1268 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1269 1270 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1271 "alua_tg_pt_status=0x%02x\n", 1272 atomic_read(&lun->lun_tg_pt_secondary_offline), 1273 lun->lun_tg_pt_secondary_stat); 1274 1275 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu", 1276 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1277 lun->unpacked_lun); 1278 1279 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1280 kfree(md_buf); 1281 1282 out_unlock: 1283 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1284 return rc; 1285 } 1286 1287 static int core_alua_set_tg_pt_secondary_state( 1288 struct se_lun *lun, 1289 int explicit, 1290 int offline) 1291 { 1292 struct t10_alua_tg_pt_gp *tg_pt_gp; 1293 int trans_delay_msecs; 1294 1295 spin_lock(&lun->lun_tg_pt_gp_lock); 1296 tg_pt_gp = lun->lun_tg_pt_gp; 1297 if (!tg_pt_gp) { 1298 spin_unlock(&lun->lun_tg_pt_gp_lock); 1299 pr_err("Unable to complete secondary state" 1300 " transition\n"); 1301 return -EINVAL; 1302 } 1303 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1304 /* 1305 * Set the secondary ALUA target port access state to OFFLINE 1306 * or release the previously secondary state for struct se_lun 1307 */ 1308 if (offline) 1309 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1310 else 1311 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1312 1313 lun->lun_tg_pt_secondary_stat = (explicit) ? 1314 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1315 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1316 1317 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1318 " to secondary access state: %s\n", (explicit) ? "explicit" : 1319 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1320 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1321 1322 spin_unlock(&lun->lun_tg_pt_gp_lock); 1323 /* 1324 * Do the optional transition delay after we set the secondary 1325 * ALUA access state. 1326 */ 1327 if (trans_delay_msecs != 0) 1328 msleep_interruptible(trans_delay_msecs); 1329 /* 1330 * See if we need to update the ALUA fabric port metadata for 1331 * secondary state and status 1332 */ 1333 if (lun->lun_tg_pt_secondary_write_md) 1334 core_alua_update_tpg_secondary_metadata(lun); 1335 1336 return 0; 1337 } 1338 1339 struct t10_alua_lba_map * 1340 core_alua_allocate_lba_map(struct list_head *list, 1341 u64 first_lba, u64 last_lba) 1342 { 1343 struct t10_alua_lba_map *lba_map; 1344 1345 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1346 if (!lba_map) { 1347 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1348 return ERR_PTR(-ENOMEM); 1349 } 1350 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1351 lba_map->lba_map_first_lba = first_lba; 1352 lba_map->lba_map_last_lba = last_lba; 1353 1354 list_add_tail(&lba_map->lba_map_list, list); 1355 return lba_map; 1356 } 1357 1358 int 1359 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1360 int pg_id, int state) 1361 { 1362 struct t10_alua_lba_map_member *lba_map_mem; 1363 1364 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1365 lba_map_mem_list) { 1366 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1367 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1368 return -EINVAL; 1369 } 1370 } 1371 1372 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1373 if (!lba_map_mem) { 1374 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1375 return -ENOMEM; 1376 } 1377 lba_map_mem->lba_map_mem_alua_state = state; 1378 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1379 1380 list_add_tail(&lba_map_mem->lba_map_mem_list, 1381 &lba_map->lba_map_mem_list); 1382 return 0; 1383 } 1384 1385 void 1386 core_alua_free_lba_map(struct list_head *lba_list) 1387 { 1388 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1389 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1390 1391 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1392 lba_map_list) { 1393 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1394 &lba_map->lba_map_mem_list, 1395 lba_map_mem_list) { 1396 list_del(&lba_map_mem->lba_map_mem_list); 1397 kmem_cache_free(t10_alua_lba_map_mem_cache, 1398 lba_map_mem); 1399 } 1400 list_del(&lba_map->lba_map_list); 1401 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1402 } 1403 } 1404 1405 void 1406 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1407 int segment_size, int segment_mult) 1408 { 1409 struct list_head old_lba_map_list; 1410 struct t10_alua_tg_pt_gp *tg_pt_gp; 1411 int activate = 0, supported; 1412 1413 INIT_LIST_HEAD(&old_lba_map_list); 1414 spin_lock(&dev->t10_alua.lba_map_lock); 1415 dev->t10_alua.lba_map_segment_size = segment_size; 1416 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1417 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1418 if (lba_map_list) { 1419 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1420 activate = 1; 1421 } 1422 spin_unlock(&dev->t10_alua.lba_map_lock); 1423 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1424 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1425 tg_pt_gp_list) { 1426 1427 if (!tg_pt_gp->tg_pt_gp_valid_id) 1428 continue; 1429 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1430 if (activate) 1431 supported |= ALUA_LBD_SUP; 1432 else 1433 supported &= ~ALUA_LBD_SUP; 1434 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1435 } 1436 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1437 core_alua_free_lba_map(&old_lba_map_list); 1438 } 1439 1440 struct t10_alua_lu_gp * 1441 core_alua_allocate_lu_gp(const char *name, int def_group) 1442 { 1443 struct t10_alua_lu_gp *lu_gp; 1444 1445 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1446 if (!lu_gp) { 1447 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1448 return ERR_PTR(-ENOMEM); 1449 } 1450 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1451 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1452 spin_lock_init(&lu_gp->lu_gp_lock); 1453 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1454 1455 if (def_group) { 1456 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1457 lu_gp->lu_gp_valid_id = 1; 1458 alua_lu_gps_count++; 1459 } 1460 1461 return lu_gp; 1462 } 1463 1464 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1465 { 1466 struct t10_alua_lu_gp *lu_gp_tmp; 1467 u16 lu_gp_id_tmp; 1468 /* 1469 * The lu_gp->lu_gp_id may only be set once.. 1470 */ 1471 if (lu_gp->lu_gp_valid_id) { 1472 pr_warn("ALUA LU Group already has a valid ID," 1473 " ignoring request\n"); 1474 return -EINVAL; 1475 } 1476 1477 spin_lock(&lu_gps_lock); 1478 if (alua_lu_gps_count == 0x0000ffff) { 1479 pr_err("Maximum ALUA alua_lu_gps_count:" 1480 " 0x0000ffff reached\n"); 1481 spin_unlock(&lu_gps_lock); 1482 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1483 return -ENOSPC; 1484 } 1485 again: 1486 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1487 alua_lu_gps_counter++; 1488 1489 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1490 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1491 if (!lu_gp_id) 1492 goto again; 1493 1494 pr_warn("ALUA Logical Unit Group ID: %hu" 1495 " already exists, ignoring request\n", 1496 lu_gp_id); 1497 spin_unlock(&lu_gps_lock); 1498 return -EINVAL; 1499 } 1500 } 1501 1502 lu_gp->lu_gp_id = lu_gp_id_tmp; 1503 lu_gp->lu_gp_valid_id = 1; 1504 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1505 alua_lu_gps_count++; 1506 spin_unlock(&lu_gps_lock); 1507 1508 return 0; 1509 } 1510 1511 static struct t10_alua_lu_gp_member * 1512 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1513 { 1514 struct t10_alua_lu_gp_member *lu_gp_mem; 1515 1516 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1517 if (!lu_gp_mem) { 1518 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1519 return ERR_PTR(-ENOMEM); 1520 } 1521 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1522 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1523 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1524 1525 lu_gp_mem->lu_gp_mem_dev = dev; 1526 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1527 1528 return lu_gp_mem; 1529 } 1530 1531 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1532 { 1533 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1534 /* 1535 * Once we have reached this point, config_item_put() has 1536 * already been called from target_core_alua_drop_lu_gp(). 1537 * 1538 * Here, we remove the *lu_gp from the global list so that 1539 * no associations can be made while we are releasing 1540 * struct t10_alua_lu_gp. 1541 */ 1542 spin_lock(&lu_gps_lock); 1543 list_del(&lu_gp->lu_gp_node); 1544 alua_lu_gps_count--; 1545 spin_unlock(&lu_gps_lock); 1546 /* 1547 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1548 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1549 * released with core_alua_put_lu_gp_from_name() 1550 */ 1551 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1552 cpu_relax(); 1553 /* 1554 * Release reference to struct t10_alua_lu_gp * from all associated 1555 * struct se_device. 1556 */ 1557 spin_lock(&lu_gp->lu_gp_lock); 1558 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1559 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1560 if (lu_gp_mem->lu_gp_assoc) { 1561 list_del(&lu_gp_mem->lu_gp_mem_list); 1562 lu_gp->lu_gp_members--; 1563 lu_gp_mem->lu_gp_assoc = 0; 1564 } 1565 spin_unlock(&lu_gp->lu_gp_lock); 1566 /* 1567 * 1568 * lu_gp_mem is associated with a single 1569 * struct se_device->dev_alua_lu_gp_mem, and is released when 1570 * struct se_device is released via core_alua_free_lu_gp_mem(). 1571 * 1572 * If the passed lu_gp does NOT match the default_lu_gp, assume 1573 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1574 */ 1575 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1576 if (lu_gp != default_lu_gp) 1577 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1578 default_lu_gp); 1579 else 1580 lu_gp_mem->lu_gp = NULL; 1581 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1582 1583 spin_lock(&lu_gp->lu_gp_lock); 1584 } 1585 spin_unlock(&lu_gp->lu_gp_lock); 1586 1587 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1588 } 1589 1590 void core_alua_free_lu_gp_mem(struct se_device *dev) 1591 { 1592 struct t10_alua_lu_gp *lu_gp; 1593 struct t10_alua_lu_gp_member *lu_gp_mem; 1594 1595 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1596 if (!lu_gp_mem) 1597 return; 1598 1599 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1600 cpu_relax(); 1601 1602 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1603 lu_gp = lu_gp_mem->lu_gp; 1604 if (lu_gp) { 1605 spin_lock(&lu_gp->lu_gp_lock); 1606 if (lu_gp_mem->lu_gp_assoc) { 1607 list_del(&lu_gp_mem->lu_gp_mem_list); 1608 lu_gp->lu_gp_members--; 1609 lu_gp_mem->lu_gp_assoc = 0; 1610 } 1611 spin_unlock(&lu_gp->lu_gp_lock); 1612 lu_gp_mem->lu_gp = NULL; 1613 } 1614 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1615 1616 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1617 } 1618 1619 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1620 { 1621 struct t10_alua_lu_gp *lu_gp; 1622 struct config_item *ci; 1623 1624 spin_lock(&lu_gps_lock); 1625 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1626 if (!lu_gp->lu_gp_valid_id) 1627 continue; 1628 ci = &lu_gp->lu_gp_group.cg_item; 1629 if (!strcmp(config_item_name(ci), name)) { 1630 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1631 spin_unlock(&lu_gps_lock); 1632 return lu_gp; 1633 } 1634 } 1635 spin_unlock(&lu_gps_lock); 1636 1637 return NULL; 1638 } 1639 1640 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1641 { 1642 spin_lock(&lu_gps_lock); 1643 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1644 spin_unlock(&lu_gps_lock); 1645 } 1646 1647 /* 1648 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1649 */ 1650 void __core_alua_attach_lu_gp_mem( 1651 struct t10_alua_lu_gp_member *lu_gp_mem, 1652 struct t10_alua_lu_gp *lu_gp) 1653 { 1654 spin_lock(&lu_gp->lu_gp_lock); 1655 lu_gp_mem->lu_gp = lu_gp; 1656 lu_gp_mem->lu_gp_assoc = 1; 1657 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1658 lu_gp->lu_gp_members++; 1659 spin_unlock(&lu_gp->lu_gp_lock); 1660 } 1661 1662 /* 1663 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1664 */ 1665 void __core_alua_drop_lu_gp_mem( 1666 struct t10_alua_lu_gp_member *lu_gp_mem, 1667 struct t10_alua_lu_gp *lu_gp) 1668 { 1669 spin_lock(&lu_gp->lu_gp_lock); 1670 list_del(&lu_gp_mem->lu_gp_mem_list); 1671 lu_gp_mem->lu_gp = NULL; 1672 lu_gp_mem->lu_gp_assoc = 0; 1673 lu_gp->lu_gp_members--; 1674 spin_unlock(&lu_gp->lu_gp_lock); 1675 } 1676 1677 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1678 const char *name, int def_group) 1679 { 1680 struct t10_alua_tg_pt_gp *tg_pt_gp; 1681 1682 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1683 if (!tg_pt_gp) { 1684 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1685 return NULL; 1686 } 1687 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1688 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1689 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1690 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1691 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1692 INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1693 core_alua_do_transition_tg_pt_work); 1694 tg_pt_gp->tg_pt_gp_dev = dev; 1695 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1696 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1697 /* 1698 * Enable both explicit and implicit ALUA support by default 1699 */ 1700 tg_pt_gp->tg_pt_gp_alua_access_type = 1701 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1702 /* 1703 * Set the default Active/NonOptimized Delay in milliseconds 1704 */ 1705 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1706 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1707 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1708 1709 /* 1710 * Enable all supported states 1711 */ 1712 tg_pt_gp->tg_pt_gp_alua_supported_states = 1713 ALUA_T_SUP | ALUA_O_SUP | 1714 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1715 1716 if (def_group) { 1717 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1718 tg_pt_gp->tg_pt_gp_id = 1719 dev->t10_alua.alua_tg_pt_gps_counter++; 1720 tg_pt_gp->tg_pt_gp_valid_id = 1; 1721 dev->t10_alua.alua_tg_pt_gps_count++; 1722 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1723 &dev->t10_alua.tg_pt_gps_list); 1724 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1725 } 1726 1727 return tg_pt_gp; 1728 } 1729 1730 int core_alua_set_tg_pt_gp_id( 1731 struct t10_alua_tg_pt_gp *tg_pt_gp, 1732 u16 tg_pt_gp_id) 1733 { 1734 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1735 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1736 u16 tg_pt_gp_id_tmp; 1737 1738 /* 1739 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1740 */ 1741 if (tg_pt_gp->tg_pt_gp_valid_id) { 1742 pr_warn("ALUA TG PT Group already has a valid ID," 1743 " ignoring request\n"); 1744 return -EINVAL; 1745 } 1746 1747 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1748 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1749 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1750 " 0x0000ffff reached\n"); 1751 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1752 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1753 return -ENOSPC; 1754 } 1755 again: 1756 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1757 dev->t10_alua.alua_tg_pt_gps_counter++; 1758 1759 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1760 tg_pt_gp_list) { 1761 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1762 if (!tg_pt_gp_id) 1763 goto again; 1764 1765 pr_err("ALUA Target Port Group ID: %hu already" 1766 " exists, ignoring request\n", tg_pt_gp_id); 1767 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1768 return -EINVAL; 1769 } 1770 } 1771 1772 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1773 tg_pt_gp->tg_pt_gp_valid_id = 1; 1774 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1775 &dev->t10_alua.tg_pt_gps_list); 1776 dev->t10_alua.alua_tg_pt_gps_count++; 1777 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1778 1779 return 0; 1780 } 1781 1782 void core_alua_free_tg_pt_gp( 1783 struct t10_alua_tg_pt_gp *tg_pt_gp) 1784 { 1785 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1786 struct se_lun *lun, *next; 1787 1788 /* 1789 * Once we have reached this point, config_item_put() has already 1790 * been called from target_core_alua_drop_tg_pt_gp(). 1791 * 1792 * Here we remove *tg_pt_gp from the global list so that 1793 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1794 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1795 */ 1796 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1797 list_del(&tg_pt_gp->tg_pt_gp_list); 1798 dev->t10_alua.alua_tg_pt_gps_counter--; 1799 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1800 1801 flush_work(&tg_pt_gp->tg_pt_gp_transition_work); 1802 1803 /* 1804 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1805 * core_alua_get_tg_pt_gp_by_name() in 1806 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1807 * to be released with core_alua_put_tg_pt_gp_from_name(). 1808 */ 1809 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1810 cpu_relax(); 1811 1812 /* 1813 * Release reference to struct t10_alua_tg_pt_gp from all associated 1814 * struct se_port. 1815 */ 1816 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1817 list_for_each_entry_safe(lun, next, 1818 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1819 list_del_init(&lun->lun_tg_pt_gp_link); 1820 tg_pt_gp->tg_pt_gp_members--; 1821 1822 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1823 /* 1824 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1825 * assume we want to re-associate a given tg_pt_gp_mem with 1826 * default_tg_pt_gp. 1827 */ 1828 spin_lock(&lun->lun_tg_pt_gp_lock); 1829 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1830 __target_attach_tg_pt_gp(lun, 1831 dev->t10_alua.default_tg_pt_gp); 1832 } else 1833 lun->lun_tg_pt_gp = NULL; 1834 spin_unlock(&lun->lun_tg_pt_gp_lock); 1835 1836 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1837 } 1838 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1839 1840 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1841 } 1842 1843 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1844 struct se_device *dev, const char *name) 1845 { 1846 struct t10_alua_tg_pt_gp *tg_pt_gp; 1847 struct config_item *ci; 1848 1849 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1850 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1851 tg_pt_gp_list) { 1852 if (!tg_pt_gp->tg_pt_gp_valid_id) 1853 continue; 1854 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1855 if (!strcmp(config_item_name(ci), name)) { 1856 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1857 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1858 return tg_pt_gp; 1859 } 1860 } 1861 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1862 1863 return NULL; 1864 } 1865 1866 static void core_alua_put_tg_pt_gp_from_name( 1867 struct t10_alua_tg_pt_gp *tg_pt_gp) 1868 { 1869 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1870 1871 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1872 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1873 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1874 } 1875 1876 static void __target_attach_tg_pt_gp(struct se_lun *lun, 1877 struct t10_alua_tg_pt_gp *tg_pt_gp) 1878 { 1879 struct se_dev_entry *se_deve; 1880 1881 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1882 1883 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1884 lun->lun_tg_pt_gp = tg_pt_gp; 1885 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1886 tg_pt_gp->tg_pt_gp_members++; 1887 spin_lock(&lun->lun_deve_lock); 1888 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1889 core_scsi3_ua_allocate(se_deve, 0x3f, 1890 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1891 spin_unlock(&lun->lun_deve_lock); 1892 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1893 } 1894 1895 void target_attach_tg_pt_gp(struct se_lun *lun, 1896 struct t10_alua_tg_pt_gp *tg_pt_gp) 1897 { 1898 spin_lock(&lun->lun_tg_pt_gp_lock); 1899 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1900 spin_unlock(&lun->lun_tg_pt_gp_lock); 1901 } 1902 1903 static void __target_detach_tg_pt_gp(struct se_lun *lun, 1904 struct t10_alua_tg_pt_gp *tg_pt_gp) 1905 { 1906 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1907 1908 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1909 list_del_init(&lun->lun_tg_pt_gp_link); 1910 tg_pt_gp->tg_pt_gp_members--; 1911 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1912 1913 lun->lun_tg_pt_gp = NULL; 1914 } 1915 1916 void target_detach_tg_pt_gp(struct se_lun *lun) 1917 { 1918 struct t10_alua_tg_pt_gp *tg_pt_gp; 1919 1920 spin_lock(&lun->lun_tg_pt_gp_lock); 1921 tg_pt_gp = lun->lun_tg_pt_gp; 1922 if (tg_pt_gp) 1923 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1924 spin_unlock(&lun->lun_tg_pt_gp_lock); 1925 } 1926 1927 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1928 { 1929 struct config_item *tg_pt_ci; 1930 struct t10_alua_tg_pt_gp *tg_pt_gp; 1931 ssize_t len = 0; 1932 1933 spin_lock(&lun->lun_tg_pt_gp_lock); 1934 tg_pt_gp = lun->lun_tg_pt_gp; 1935 if (tg_pt_gp) { 1936 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1937 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1938 " %hu\nTG Port Primary Access State: %s\nTG Port " 1939 "Primary Access Status: %s\nTG Port Secondary Access" 1940 " State: %s\nTG Port Secondary Access Status: %s\n", 1941 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1942 core_alua_dump_state(atomic_read( 1943 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1944 core_alua_dump_status( 1945 tg_pt_gp->tg_pt_gp_alua_access_status), 1946 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1947 "Offline" : "None", 1948 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1949 } 1950 spin_unlock(&lun->lun_tg_pt_gp_lock); 1951 1952 return len; 1953 } 1954 1955 ssize_t core_alua_store_tg_pt_gp_info( 1956 struct se_lun *lun, 1957 const char *page, 1958 size_t count) 1959 { 1960 struct se_portal_group *tpg = lun->lun_tpg; 1961 /* 1962 * rcu_dereference_raw protected by se_lun->lun_group symlink 1963 * reference to se_device->dev_group. 1964 */ 1965 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1966 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1967 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1968 int move = 0; 1969 1970 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 1971 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1972 return -ENODEV; 1973 1974 if (count > TG_PT_GROUP_NAME_BUF) { 1975 pr_err("ALUA Target Port Group alias too large!\n"); 1976 return -EINVAL; 1977 } 1978 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1979 memcpy(buf, page, count); 1980 /* 1981 * Any ALUA target port group alias besides "NULL" means we will be 1982 * making a new group association. 1983 */ 1984 if (strcmp(strstrip(buf), "NULL")) { 1985 /* 1986 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1987 * struct t10_alua_tg_pt_gp. This reference is released with 1988 * core_alua_put_tg_pt_gp_from_name() below. 1989 */ 1990 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1991 strstrip(buf)); 1992 if (!tg_pt_gp_new) 1993 return -ENODEV; 1994 } 1995 1996 spin_lock(&lun->lun_tg_pt_gp_lock); 1997 tg_pt_gp = lun->lun_tg_pt_gp; 1998 if (tg_pt_gp) { 1999 /* 2000 * Clearing an existing tg_pt_gp association, and replacing 2001 * with the default_tg_pt_gp. 2002 */ 2003 if (!tg_pt_gp_new) { 2004 pr_debug("Target_Core_ConfigFS: Moving" 2005 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2006 " alua/%s, ID: %hu back to" 2007 " default_tg_pt_gp\n", 2008 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2009 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2010 config_item_name(&lun->lun_group.cg_item), 2011 config_item_name( 2012 &tg_pt_gp->tg_pt_gp_group.cg_item), 2013 tg_pt_gp->tg_pt_gp_id); 2014 2015 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2016 __target_attach_tg_pt_gp(lun, 2017 dev->t10_alua.default_tg_pt_gp); 2018 spin_unlock(&lun->lun_tg_pt_gp_lock); 2019 2020 return count; 2021 } 2022 __target_detach_tg_pt_gp(lun, tg_pt_gp); 2023 move = 1; 2024 } 2025 2026 __target_attach_tg_pt_gp(lun, tg_pt_gp_new); 2027 spin_unlock(&lun->lun_tg_pt_gp_lock); 2028 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2029 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2030 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2031 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2032 config_item_name(&lun->lun_group.cg_item), 2033 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2034 tg_pt_gp_new->tg_pt_gp_id); 2035 2036 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2037 return count; 2038 } 2039 2040 ssize_t core_alua_show_access_type( 2041 struct t10_alua_tg_pt_gp *tg_pt_gp, 2042 char *page) 2043 { 2044 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2045 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2046 return sprintf(page, "Implicit and Explicit\n"); 2047 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2048 return sprintf(page, "Implicit\n"); 2049 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2050 return sprintf(page, "Explicit\n"); 2051 else 2052 return sprintf(page, "None\n"); 2053 } 2054 2055 ssize_t core_alua_store_access_type( 2056 struct t10_alua_tg_pt_gp *tg_pt_gp, 2057 const char *page, 2058 size_t count) 2059 { 2060 unsigned long tmp; 2061 int ret; 2062 2063 ret = kstrtoul(page, 0, &tmp); 2064 if (ret < 0) { 2065 pr_err("Unable to extract alua_access_type\n"); 2066 return ret; 2067 } 2068 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2069 pr_err("Illegal value for alua_access_type:" 2070 " %lu\n", tmp); 2071 return -EINVAL; 2072 } 2073 if (tmp == 3) 2074 tg_pt_gp->tg_pt_gp_alua_access_type = 2075 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2076 else if (tmp == 2) 2077 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2078 else if (tmp == 1) 2079 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2080 else 2081 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2082 2083 return count; 2084 } 2085 2086 ssize_t core_alua_show_nonop_delay_msecs( 2087 struct t10_alua_tg_pt_gp *tg_pt_gp, 2088 char *page) 2089 { 2090 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2091 } 2092 2093 ssize_t core_alua_store_nonop_delay_msecs( 2094 struct t10_alua_tg_pt_gp *tg_pt_gp, 2095 const char *page, 2096 size_t count) 2097 { 2098 unsigned long tmp; 2099 int ret; 2100 2101 ret = kstrtoul(page, 0, &tmp); 2102 if (ret < 0) { 2103 pr_err("Unable to extract nonop_delay_msecs\n"); 2104 return ret; 2105 } 2106 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2107 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2108 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2109 ALUA_MAX_NONOP_DELAY_MSECS); 2110 return -EINVAL; 2111 } 2112 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2113 2114 return count; 2115 } 2116 2117 ssize_t core_alua_show_trans_delay_msecs( 2118 struct t10_alua_tg_pt_gp *tg_pt_gp, 2119 char *page) 2120 { 2121 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2122 } 2123 2124 ssize_t core_alua_store_trans_delay_msecs( 2125 struct t10_alua_tg_pt_gp *tg_pt_gp, 2126 const char *page, 2127 size_t count) 2128 { 2129 unsigned long tmp; 2130 int ret; 2131 2132 ret = kstrtoul(page, 0, &tmp); 2133 if (ret < 0) { 2134 pr_err("Unable to extract trans_delay_msecs\n"); 2135 return ret; 2136 } 2137 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2138 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2139 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2140 ALUA_MAX_TRANS_DELAY_MSECS); 2141 return -EINVAL; 2142 } 2143 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2144 2145 return count; 2146 } 2147 2148 ssize_t core_alua_show_implicit_trans_secs( 2149 struct t10_alua_tg_pt_gp *tg_pt_gp, 2150 char *page) 2151 { 2152 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2153 } 2154 2155 ssize_t core_alua_store_implicit_trans_secs( 2156 struct t10_alua_tg_pt_gp *tg_pt_gp, 2157 const char *page, 2158 size_t count) 2159 { 2160 unsigned long tmp; 2161 int ret; 2162 2163 ret = kstrtoul(page, 0, &tmp); 2164 if (ret < 0) { 2165 pr_err("Unable to extract implicit_trans_secs\n"); 2166 return ret; 2167 } 2168 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2169 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2170 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2171 ALUA_MAX_IMPLICIT_TRANS_SECS); 2172 return -EINVAL; 2173 } 2174 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2175 2176 return count; 2177 } 2178 2179 ssize_t core_alua_show_preferred_bit( 2180 struct t10_alua_tg_pt_gp *tg_pt_gp, 2181 char *page) 2182 { 2183 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2184 } 2185 2186 ssize_t core_alua_store_preferred_bit( 2187 struct t10_alua_tg_pt_gp *tg_pt_gp, 2188 const char *page, 2189 size_t count) 2190 { 2191 unsigned long tmp; 2192 int ret; 2193 2194 ret = kstrtoul(page, 0, &tmp); 2195 if (ret < 0) { 2196 pr_err("Unable to extract preferred ALUA value\n"); 2197 return ret; 2198 } 2199 if ((tmp != 0) && (tmp != 1)) { 2200 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2201 return -EINVAL; 2202 } 2203 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2204 2205 return count; 2206 } 2207 2208 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2209 { 2210 return sprintf(page, "%d\n", 2211 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2212 } 2213 2214 ssize_t core_alua_store_offline_bit( 2215 struct se_lun *lun, 2216 const char *page, 2217 size_t count) 2218 { 2219 /* 2220 * rcu_dereference_raw protected by se_lun->lun_group symlink 2221 * reference to se_device->dev_group. 2222 */ 2223 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2224 unsigned long tmp; 2225 int ret; 2226 2227 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 2228 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2229 return -ENODEV; 2230 2231 ret = kstrtoul(page, 0, &tmp); 2232 if (ret < 0) { 2233 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2234 return ret; 2235 } 2236 if ((tmp != 0) && (tmp != 1)) { 2237 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2238 tmp); 2239 return -EINVAL; 2240 } 2241 2242 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2243 if (ret < 0) 2244 return -EINVAL; 2245 2246 return count; 2247 } 2248 2249 ssize_t core_alua_show_secondary_status( 2250 struct se_lun *lun, 2251 char *page) 2252 { 2253 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2254 } 2255 2256 ssize_t core_alua_store_secondary_status( 2257 struct se_lun *lun, 2258 const char *page, 2259 size_t count) 2260 { 2261 unsigned long tmp; 2262 int ret; 2263 2264 ret = kstrtoul(page, 0, &tmp); 2265 if (ret < 0) { 2266 pr_err("Unable to extract alua_tg_pt_status\n"); 2267 return ret; 2268 } 2269 if ((tmp != ALUA_STATUS_NONE) && 2270 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2271 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2272 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2273 tmp); 2274 return -EINVAL; 2275 } 2276 lun->lun_tg_pt_secondary_stat = (int)tmp; 2277 2278 return count; 2279 } 2280 2281 ssize_t core_alua_show_secondary_write_metadata( 2282 struct se_lun *lun, 2283 char *page) 2284 { 2285 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2286 } 2287 2288 ssize_t core_alua_store_secondary_write_metadata( 2289 struct se_lun *lun, 2290 const char *page, 2291 size_t count) 2292 { 2293 unsigned long tmp; 2294 int ret; 2295 2296 ret = kstrtoul(page, 0, &tmp); 2297 if (ret < 0) { 2298 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2299 return ret; 2300 } 2301 if ((tmp != 0) && (tmp != 1)) { 2302 pr_err("Illegal value for alua_tg_pt_write_md:" 2303 " %lu\n", tmp); 2304 return -EINVAL; 2305 } 2306 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2307 2308 return count; 2309 } 2310 2311 int core_setup_alua(struct se_device *dev) 2312 { 2313 if (!(dev->transport->transport_flags & 2314 TRANSPORT_FLAG_PASSTHROUGH_ALUA) && 2315 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2316 struct t10_alua_lu_gp_member *lu_gp_mem; 2317 2318 /* 2319 * Associate this struct se_device with the default ALUA 2320 * LUN Group. 2321 */ 2322 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2323 if (IS_ERR(lu_gp_mem)) 2324 return PTR_ERR(lu_gp_mem); 2325 2326 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2327 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2328 default_lu_gp); 2329 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2330 2331 pr_debug("%s: Adding to default ALUA LU Group:" 2332 " core/alua/lu_gps/default_lu_gp\n", 2333 dev->transport->name); 2334 } 2335 2336 return 0; 2337 } 2338