1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_alua.c 4 * 5 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) 6 * 7 * (c) Copyright 2009-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13 #include <linux/slab.h> 14 #include <linux/spinlock.h> 15 #include <linux/configfs.h> 16 #include <linux/delay.h> 17 #include <linux/export.h> 18 #include <linux/fcntl.h> 19 #include <linux/file.h> 20 #include <linux/fs.h> 21 #include <scsi/scsi_proto.h> 22 #include <asm/unaligned.h> 23 24 #include <target/target_core_base.h> 25 #include <target/target_core_backend.h> 26 #include <target/target_core_fabric.h> 27 28 #include "target_core_internal.h" 29 #include "target_core_alua.h" 30 #include "target_core_ua.h" 31 32 static sense_reason_t core_alua_check_transition(int state, int valid, 33 int *primary, int explicit); 34 static int core_alua_set_tg_pt_secondary_state( 35 struct se_lun *lun, int explicit, int offline); 36 37 static char *core_alua_dump_state(int state); 38 39 static void __target_attach_tg_pt_gp(struct se_lun *lun, 40 struct t10_alua_tg_pt_gp *tg_pt_gp); 41 42 static u16 alua_lu_gps_counter; 43 static u32 alua_lu_gps_count; 44 45 static DEFINE_SPINLOCK(lu_gps_lock); 46 static LIST_HEAD(lu_gps_list); 47 48 struct t10_alua_lu_gp *default_lu_gp; 49 50 /* 51 * REPORT REFERRALS 52 * 53 * See sbc3r35 section 5.23 54 */ 55 sense_reason_t 56 target_emulate_report_referrals(struct se_cmd *cmd) 57 { 58 struct se_device *dev = cmd->se_dev; 59 struct t10_alua_lba_map *map; 60 struct t10_alua_lba_map_member *map_mem; 61 unsigned char *buf; 62 u32 rd_len = 0, off; 63 64 if (cmd->data_length < 4) { 65 pr_warn("REPORT REFERRALS allocation length %u too" 66 " small\n", cmd->data_length); 67 return TCM_INVALID_CDB_FIELD; 68 } 69 70 buf = transport_kmap_data_sg(cmd); 71 if (!buf) 72 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 73 74 off = 4; 75 spin_lock(&dev->t10_alua.lba_map_lock); 76 if (list_empty(&dev->t10_alua.lba_map_list)) { 77 spin_unlock(&dev->t10_alua.lba_map_lock); 78 transport_kunmap_data_sg(cmd); 79 80 return TCM_UNSUPPORTED_SCSI_OPCODE; 81 } 82 83 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 84 lba_map_list) { 85 int desc_num = off + 3; 86 int pg_num; 87 88 off += 4; 89 if (cmd->data_length > off) 90 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 91 off += 8; 92 if (cmd->data_length > off) 93 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 94 off += 8; 95 rd_len += 20; 96 pg_num = 0; 97 list_for_each_entry(map_mem, &map->lba_map_mem_list, 98 lba_map_mem_list) { 99 int alua_state = map_mem->lba_map_mem_alua_state; 100 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 101 102 if (cmd->data_length > off) 103 buf[off] = alua_state & 0x0f; 104 off += 2; 105 if (cmd->data_length > off) 106 buf[off] = (alua_pg_id >> 8) & 0xff; 107 off++; 108 if (cmd->data_length > off) 109 buf[off] = (alua_pg_id & 0xff); 110 off++; 111 rd_len += 4; 112 pg_num++; 113 } 114 if (cmd->data_length > desc_num) 115 buf[desc_num] = pg_num; 116 } 117 spin_unlock(&dev->t10_alua.lba_map_lock); 118 119 /* 120 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 121 */ 122 put_unaligned_be16(rd_len, &buf[2]); 123 124 transport_kunmap_data_sg(cmd); 125 126 target_complete_cmd(cmd, SAM_STAT_GOOD); 127 return 0; 128 } 129 130 /* 131 * REPORT_TARGET_PORT_GROUPS 132 * 133 * See spc4r17 section 6.27 134 */ 135 sense_reason_t 136 target_emulate_report_target_port_groups(struct se_cmd *cmd) 137 { 138 struct se_device *dev = cmd->se_dev; 139 struct t10_alua_tg_pt_gp *tg_pt_gp; 140 struct se_lun *lun; 141 unsigned char *buf; 142 u32 rd_len = 0, off; 143 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 144 145 /* 146 * Skip over RESERVED area to first Target port group descriptor 147 * depending on the PARAMETER DATA FORMAT type.. 148 */ 149 if (ext_hdr != 0) 150 off = 8; 151 else 152 off = 4; 153 154 if (cmd->data_length < off) { 155 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 156 " small for %s header\n", cmd->data_length, 157 (ext_hdr) ? "extended" : "normal"); 158 return TCM_INVALID_CDB_FIELD; 159 } 160 buf = transport_kmap_data_sg(cmd); 161 if (!buf) 162 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 163 164 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 165 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 166 tg_pt_gp_list) { 167 /* Skip empty port groups */ 168 if (!tg_pt_gp->tg_pt_gp_members) 169 continue; 170 /* 171 * Check if the Target port group and Target port descriptor list 172 * based on tg_pt_gp_members count will fit into the response payload. 173 * Otherwise, bump rd_len to let the initiator know we have exceeded 174 * the allocation length and the response is truncated. 175 */ 176 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 177 cmd->data_length) { 178 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 179 continue; 180 } 181 /* 182 * PREF: Preferred target port bit, determine if this 183 * bit should be set for port group. 184 */ 185 if (tg_pt_gp->tg_pt_gp_pref) 186 buf[off] = 0x80; 187 /* 188 * Set the ASYMMETRIC ACCESS State 189 */ 190 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff; 191 /* 192 * Set supported ASYMMETRIC ACCESS State bits 193 */ 194 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 195 /* 196 * TARGET PORT GROUP 197 */ 198 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]); 199 off += 2; 200 201 off++; /* Skip over Reserved */ 202 /* 203 * STATUS CODE 204 */ 205 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 206 /* 207 * Vendor Specific field 208 */ 209 buf[off++] = 0x00; 210 /* 211 * TARGET PORT COUNT 212 */ 213 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 214 rd_len += 8; 215 216 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 217 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 218 lun_tg_pt_gp_link) { 219 /* 220 * Start Target Port descriptor format 221 * 222 * See spc4r17 section 6.2.7 Table 247 223 */ 224 off += 2; /* Skip over Obsolete */ 225 /* 226 * Set RELATIVE TARGET PORT IDENTIFIER 227 */ 228 put_unaligned_be16(lun->lun_rtpi, &buf[off]); 229 off += 2; 230 rd_len += 4; 231 } 232 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 233 } 234 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 235 /* 236 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 237 */ 238 put_unaligned_be32(rd_len, &buf[0]); 239 240 /* 241 * Fill in the Extended header parameter data format if requested 242 */ 243 if (ext_hdr != 0) { 244 buf[4] = 0x10; 245 /* 246 * Set the implicit transition time (in seconds) for the application 247 * client to use as a base for it's transition timeout value. 248 * 249 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 250 * this CDB was received upon to determine this value individually 251 * for ALUA target port group. 252 */ 253 rcu_read_lock(); 254 tg_pt_gp = rcu_dereference(cmd->se_lun->lun_tg_pt_gp); 255 if (tg_pt_gp) 256 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 257 rcu_read_unlock(); 258 } 259 transport_kunmap_data_sg(cmd); 260 261 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4); 262 return 0; 263 } 264 265 /* 266 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 267 * 268 * See spc4r17 section 6.35 269 */ 270 sense_reason_t 271 target_emulate_set_target_port_groups(struct se_cmd *cmd) 272 { 273 struct se_device *dev = cmd->se_dev; 274 struct se_lun *l_lun = cmd->se_lun; 275 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 276 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 277 unsigned char *buf; 278 unsigned char *ptr; 279 sense_reason_t rc = TCM_NO_SENSE; 280 u32 len = 4; /* Skip over RESERVED area in header */ 281 int alua_access_state, primary = 0, valid_states; 282 u16 tg_pt_id, rtpi; 283 284 if (cmd->data_length < 4) { 285 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 286 " small\n", cmd->data_length); 287 return TCM_INVALID_PARAMETER_LIST; 288 } 289 290 buf = transport_kmap_data_sg(cmd); 291 if (!buf) 292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 293 294 /* 295 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 296 * for the local tg_pt_gp. 297 */ 298 rcu_read_lock(); 299 l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp); 300 if (!l_tg_pt_gp) { 301 rcu_read_unlock(); 302 pr_err("Unable to access l_lun->tg_pt_gp\n"); 303 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 304 goto out; 305 } 306 307 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 308 rcu_read_unlock(); 309 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 310 " while TPGS_EXPLICIT_ALUA is disabled\n"); 311 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 312 goto out; 313 } 314 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 315 rcu_read_unlock(); 316 317 ptr = &buf[4]; /* Skip over RESERVED area in header */ 318 319 while (len < cmd->data_length) { 320 bool found = false; 321 alua_access_state = (ptr[0] & 0x0f); 322 /* 323 * Check the received ALUA access state, and determine if 324 * the state is a primary or secondary target port asymmetric 325 * access state. 326 */ 327 rc = core_alua_check_transition(alua_access_state, valid_states, 328 &primary, 1); 329 if (rc) { 330 /* 331 * If the SET TARGET PORT GROUPS attempts to establish 332 * an invalid combination of target port asymmetric 333 * access states or attempts to establish an 334 * unsupported target port asymmetric access state, 335 * then the command shall be terminated with CHECK 336 * CONDITION status, with the sense key set to ILLEGAL 337 * REQUEST, and the additional sense code set to INVALID 338 * FIELD IN PARAMETER LIST. 339 */ 340 goto out; 341 } 342 343 /* 344 * If the ASYMMETRIC ACCESS STATE field (see table 267) 345 * specifies a primary target port asymmetric access state, 346 * then the TARGET PORT GROUP OR TARGET PORT field specifies 347 * a primary target port group for which the primary target 348 * port asymmetric access state shall be changed. If the 349 * ASYMMETRIC ACCESS STATE field specifies a secondary target 350 * port asymmetric access state, then the TARGET PORT GROUP OR 351 * TARGET PORT field specifies the relative target port 352 * identifier (see 3.1.120) of the target port for which the 353 * secondary target port asymmetric access state shall be 354 * changed. 355 */ 356 if (primary) { 357 tg_pt_id = get_unaligned_be16(ptr + 2); 358 /* 359 * Locate the matching target port group ID from 360 * the global tg_pt_gp list 361 */ 362 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 363 list_for_each_entry(tg_pt_gp, 364 &dev->t10_alua.tg_pt_gps_list, 365 tg_pt_gp_list) { 366 if (!tg_pt_gp->tg_pt_gp_valid_id) 367 continue; 368 369 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 370 continue; 371 372 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 373 374 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 375 376 if (!core_alua_do_port_transition(tg_pt_gp, 377 dev, l_lun, nacl, 378 alua_access_state, 1)) 379 found = true; 380 381 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 382 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 383 break; 384 } 385 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 386 } else { 387 struct se_lun *lun; 388 389 /* 390 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 391 * the Target Port in question for the incoming 392 * SET_TARGET_PORT_GROUPS op. 393 */ 394 rtpi = get_unaligned_be16(ptr + 2); 395 /* 396 * Locate the matching relative target port identifier 397 * for the struct se_device storage object. 398 */ 399 spin_lock(&dev->se_port_lock); 400 list_for_each_entry(lun, &dev->dev_sep_list, 401 lun_dev_link) { 402 if (lun->lun_rtpi != rtpi) 403 continue; 404 405 // XXX: racy unlock 406 spin_unlock(&dev->se_port_lock); 407 408 if (!core_alua_set_tg_pt_secondary_state( 409 lun, 1, 1)) 410 found = true; 411 412 spin_lock(&dev->se_port_lock); 413 break; 414 } 415 spin_unlock(&dev->se_port_lock); 416 } 417 418 if (!found) { 419 rc = TCM_INVALID_PARAMETER_LIST; 420 goto out; 421 } 422 423 ptr += 4; 424 len += 4; 425 } 426 427 out: 428 transport_kunmap_data_sg(cmd); 429 if (!rc) 430 target_complete_cmd(cmd, SAM_STAT_GOOD); 431 return rc; 432 } 433 434 static inline void core_alua_state_nonoptimized( 435 struct se_cmd *cmd, 436 unsigned char *cdb, 437 int nonop_delay_msecs) 438 { 439 /* 440 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 441 * later to determine if processing of this cmd needs to be 442 * temporarily delayed for the Active/NonOptimized primary access state. 443 */ 444 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 445 cmd->alua_nonop_delay = nonop_delay_msecs; 446 } 447 448 static inline sense_reason_t core_alua_state_lba_dependent( 449 struct se_cmd *cmd, 450 u16 tg_pt_gp_id) 451 { 452 struct se_device *dev = cmd->se_dev; 453 u64 segment_size, segment_mult, sectors, lba; 454 455 /* Only need to check for cdb actually containing LBAs */ 456 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 457 return 0; 458 459 spin_lock(&dev->t10_alua.lba_map_lock); 460 segment_size = dev->t10_alua.lba_map_segment_size; 461 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 462 sectors = cmd->data_length / dev->dev_attrib.block_size; 463 464 lba = cmd->t_task_lba; 465 while (lba < cmd->t_task_lba + sectors) { 466 struct t10_alua_lba_map *cur_map = NULL, *map; 467 struct t10_alua_lba_map_member *map_mem; 468 469 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 470 lba_map_list) { 471 u64 start_lba, last_lba; 472 u64 first_lba = map->lba_map_first_lba; 473 474 if (segment_mult) { 475 u64 tmp = lba; 476 start_lba = do_div(tmp, segment_size * segment_mult); 477 478 last_lba = first_lba + segment_size - 1; 479 if (start_lba >= first_lba && 480 start_lba <= last_lba) { 481 lba += segment_size; 482 cur_map = map; 483 break; 484 } 485 } else { 486 last_lba = map->lba_map_last_lba; 487 if (lba >= first_lba && lba <= last_lba) { 488 lba = last_lba + 1; 489 cur_map = map; 490 break; 491 } 492 } 493 } 494 if (!cur_map) { 495 spin_unlock(&dev->t10_alua.lba_map_lock); 496 return TCM_ALUA_TG_PT_UNAVAILABLE; 497 } 498 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 499 lba_map_mem_list) { 500 if (map_mem->lba_map_mem_alua_pg_id != tg_pt_gp_id) 501 continue; 502 switch(map_mem->lba_map_mem_alua_state) { 503 case ALUA_ACCESS_STATE_STANDBY: 504 spin_unlock(&dev->t10_alua.lba_map_lock); 505 return TCM_ALUA_TG_PT_STANDBY; 506 case ALUA_ACCESS_STATE_UNAVAILABLE: 507 spin_unlock(&dev->t10_alua.lba_map_lock); 508 return TCM_ALUA_TG_PT_UNAVAILABLE; 509 default: 510 break; 511 } 512 } 513 } 514 spin_unlock(&dev->t10_alua.lba_map_lock); 515 return 0; 516 } 517 518 static inline sense_reason_t core_alua_state_standby( 519 struct se_cmd *cmd, 520 unsigned char *cdb) 521 { 522 /* 523 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 524 * spc4r17 section 5.9.2.4.4 525 */ 526 switch (cdb[0]) { 527 case INQUIRY: 528 case LOG_SELECT: 529 case LOG_SENSE: 530 case MODE_SELECT: 531 case MODE_SENSE: 532 case REPORT_LUNS: 533 case RECEIVE_DIAGNOSTIC: 534 case SEND_DIAGNOSTIC: 535 case READ_CAPACITY: 536 return 0; 537 case SERVICE_ACTION_IN_16: 538 switch (cdb[1] & 0x1f) { 539 case SAI_READ_CAPACITY_16: 540 return 0; 541 default: 542 return TCM_ALUA_TG_PT_STANDBY; 543 } 544 case MAINTENANCE_IN: 545 switch (cdb[1] & 0x1f) { 546 case MI_REPORT_TARGET_PGS: 547 return 0; 548 default: 549 return TCM_ALUA_TG_PT_STANDBY; 550 } 551 case MAINTENANCE_OUT: 552 switch (cdb[1]) { 553 case MO_SET_TARGET_PGS: 554 return 0; 555 default: 556 return TCM_ALUA_TG_PT_STANDBY; 557 } 558 case REQUEST_SENSE: 559 case PERSISTENT_RESERVE_IN: 560 case PERSISTENT_RESERVE_OUT: 561 case READ_BUFFER: 562 case WRITE_BUFFER: 563 return 0; 564 default: 565 return TCM_ALUA_TG_PT_STANDBY; 566 } 567 568 return 0; 569 } 570 571 static inline sense_reason_t core_alua_state_unavailable( 572 struct se_cmd *cmd, 573 unsigned char *cdb) 574 { 575 /* 576 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 577 * spc4r17 section 5.9.2.4.5 578 */ 579 switch (cdb[0]) { 580 case INQUIRY: 581 case REPORT_LUNS: 582 return 0; 583 case MAINTENANCE_IN: 584 switch (cdb[1] & 0x1f) { 585 case MI_REPORT_TARGET_PGS: 586 return 0; 587 default: 588 return TCM_ALUA_TG_PT_UNAVAILABLE; 589 } 590 case MAINTENANCE_OUT: 591 switch (cdb[1]) { 592 case MO_SET_TARGET_PGS: 593 return 0; 594 default: 595 return TCM_ALUA_TG_PT_UNAVAILABLE; 596 } 597 case REQUEST_SENSE: 598 case READ_BUFFER: 599 case WRITE_BUFFER: 600 return 0; 601 default: 602 return TCM_ALUA_TG_PT_UNAVAILABLE; 603 } 604 605 return 0; 606 } 607 608 static inline sense_reason_t core_alua_state_transition( 609 struct se_cmd *cmd, 610 unsigned char *cdb) 611 { 612 /* 613 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 614 * spc4r17 section 5.9.2.5 615 */ 616 switch (cdb[0]) { 617 case INQUIRY: 618 case REPORT_LUNS: 619 return 0; 620 case MAINTENANCE_IN: 621 switch (cdb[1] & 0x1f) { 622 case MI_REPORT_TARGET_PGS: 623 return 0; 624 default: 625 return TCM_ALUA_STATE_TRANSITION; 626 } 627 case REQUEST_SENSE: 628 case READ_BUFFER: 629 case WRITE_BUFFER: 630 return 0; 631 default: 632 return TCM_ALUA_STATE_TRANSITION; 633 } 634 635 return 0; 636 } 637 638 /* 639 * return 1: Is used to signal LUN not accessible, and check condition/not ready 640 * return 0: Used to signal success 641 * return -1: Used to signal failure, and invalid cdb field 642 */ 643 sense_reason_t 644 target_alua_state_check(struct se_cmd *cmd) 645 { 646 struct se_device *dev = cmd->se_dev; 647 unsigned char *cdb = cmd->t_task_cdb; 648 struct se_lun *lun = cmd->se_lun; 649 struct t10_alua_tg_pt_gp *tg_pt_gp; 650 int out_alua_state, nonop_delay_msecs; 651 u16 tg_pt_gp_id; 652 sense_reason_t rc = TCM_NO_SENSE; 653 654 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 655 return 0; 656 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 657 return 0; 658 659 /* 660 * First, check for a struct se_port specific secondary ALUA target port 661 * access state: OFFLINE 662 */ 663 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) { 664 pr_debug("ALUA: Got secondary offline status for local" 665 " target port\n"); 666 return TCM_ALUA_OFFLINE; 667 } 668 rcu_read_lock(); 669 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 670 if (!tg_pt_gp) { 671 rcu_read_unlock(); 672 return 0; 673 } 674 675 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state; 676 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 677 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 678 rcu_read_unlock(); 679 /* 680 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 681 * statement so the compiler knows explicitly to check this case first. 682 * For the Optimized ALUA access state case, we want to process the 683 * incoming fabric cmd ASAP.. 684 */ 685 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 686 return 0; 687 688 switch (out_alua_state) { 689 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 690 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 691 break; 692 case ALUA_ACCESS_STATE_STANDBY: 693 rc = core_alua_state_standby(cmd, cdb); 694 break; 695 case ALUA_ACCESS_STATE_UNAVAILABLE: 696 rc = core_alua_state_unavailable(cmd, cdb); 697 break; 698 case ALUA_ACCESS_STATE_TRANSITION: 699 rc = core_alua_state_transition(cmd, cdb); 700 break; 701 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 702 rc = core_alua_state_lba_dependent(cmd, tg_pt_gp_id); 703 break; 704 /* 705 * OFFLINE is a secondary ALUA target port group access state, that is 706 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1 707 */ 708 case ALUA_ACCESS_STATE_OFFLINE: 709 default: 710 pr_err("Unknown ALUA access state: 0x%02x\n", 711 out_alua_state); 712 rc = TCM_INVALID_CDB_FIELD; 713 } 714 715 if (rc && rc != TCM_INVALID_CDB_FIELD) { 716 pr_debug("[%s]: ALUA TG Port not available, " 717 "SenseKey: NOT_READY, ASC/rc: 0x04/%d\n", 718 cmd->se_tfo->fabric_name, rc); 719 } 720 721 return rc; 722 } 723 724 /* 725 * Check implicit and explicit ALUA state change request. 726 */ 727 static sense_reason_t 728 core_alua_check_transition(int state, int valid, int *primary, int explicit) 729 { 730 /* 731 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 732 * defined as primary target port asymmetric access states. 733 */ 734 switch (state) { 735 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 736 if (!(valid & ALUA_AO_SUP)) 737 goto not_supported; 738 *primary = 1; 739 break; 740 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 741 if (!(valid & ALUA_AN_SUP)) 742 goto not_supported; 743 *primary = 1; 744 break; 745 case ALUA_ACCESS_STATE_STANDBY: 746 if (!(valid & ALUA_S_SUP)) 747 goto not_supported; 748 *primary = 1; 749 break; 750 case ALUA_ACCESS_STATE_UNAVAILABLE: 751 if (!(valid & ALUA_U_SUP)) 752 goto not_supported; 753 *primary = 1; 754 break; 755 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 756 if (!(valid & ALUA_LBD_SUP)) 757 goto not_supported; 758 *primary = 1; 759 break; 760 case ALUA_ACCESS_STATE_OFFLINE: 761 /* 762 * OFFLINE state is defined as a secondary target port 763 * asymmetric access state. 764 */ 765 if (!(valid & ALUA_O_SUP)) 766 goto not_supported; 767 *primary = 0; 768 break; 769 case ALUA_ACCESS_STATE_TRANSITION: 770 if (!(valid & ALUA_T_SUP) || explicit) 771 /* 772 * Transitioning is set internally and by tcmu daemon, 773 * and cannot be selected through a STPG. 774 */ 775 goto not_supported; 776 *primary = 0; 777 break; 778 default: 779 pr_err("Unknown ALUA access state: 0x%02x\n", state); 780 return TCM_INVALID_PARAMETER_LIST; 781 } 782 783 return 0; 784 785 not_supported: 786 pr_err("ALUA access state %s not supported", 787 core_alua_dump_state(state)); 788 return TCM_INVALID_PARAMETER_LIST; 789 } 790 791 static char *core_alua_dump_state(int state) 792 { 793 switch (state) { 794 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 795 return "Active/Optimized"; 796 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 797 return "Active/NonOptimized"; 798 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 799 return "LBA Dependent"; 800 case ALUA_ACCESS_STATE_STANDBY: 801 return "Standby"; 802 case ALUA_ACCESS_STATE_UNAVAILABLE: 803 return "Unavailable"; 804 case ALUA_ACCESS_STATE_OFFLINE: 805 return "Offline"; 806 case ALUA_ACCESS_STATE_TRANSITION: 807 return "Transitioning"; 808 default: 809 return "Unknown"; 810 } 811 812 return NULL; 813 } 814 815 char *core_alua_dump_status(int status) 816 { 817 switch (status) { 818 case ALUA_STATUS_NONE: 819 return "None"; 820 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 821 return "Altered by Explicit STPG"; 822 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 823 return "Altered by Implicit ALUA"; 824 default: 825 return "Unknown"; 826 } 827 828 return NULL; 829 } 830 831 /* 832 * Used by fabric modules to determine when we need to delay processing 833 * for the Active/NonOptimized paths.. 834 */ 835 int core_alua_check_nonop_delay( 836 struct se_cmd *cmd) 837 { 838 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 839 return 0; 840 /* 841 * The ALUA Active/NonOptimized access state delay can be disabled 842 * in via configfs with a value of zero 843 */ 844 if (!cmd->alua_nonop_delay) 845 return 0; 846 /* 847 * struct se_cmd->alua_nonop_delay gets set by a target port group 848 * defined interval in core_alua_state_nonoptimized() 849 */ 850 msleep_interruptible(cmd->alua_nonop_delay); 851 return 0; 852 } 853 EXPORT_SYMBOL(core_alua_check_nonop_delay); 854 855 static int core_alua_write_tpg_metadata( 856 const char *path, 857 unsigned char *md_buf, 858 u32 md_buf_len) 859 { 860 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 861 loff_t pos = 0; 862 int ret; 863 864 if (IS_ERR(file)) { 865 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 866 return -ENODEV; 867 } 868 ret = kernel_write(file, md_buf, md_buf_len, &pos); 869 if (ret < 0) 870 pr_err("Error writing ALUA metadata file: %s\n", path); 871 fput(file); 872 return (ret < 0) ? -EIO : 0; 873 } 874 875 static int core_alua_update_tpg_primary_metadata( 876 struct t10_alua_tg_pt_gp *tg_pt_gp) 877 { 878 unsigned char *md_buf; 879 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 880 char *path; 881 int len, rc; 882 883 lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex); 884 885 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 886 if (!md_buf) { 887 pr_err("Unable to allocate buf for ALUA metadata\n"); 888 return -ENOMEM; 889 } 890 891 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 892 "tg_pt_gp_id=%hu\n" 893 "alua_access_state=0x%02x\n" 894 "alua_access_status=0x%02x\n", 895 tg_pt_gp->tg_pt_gp_id, 896 tg_pt_gp->tg_pt_gp_alua_access_state, 897 tg_pt_gp->tg_pt_gp_alua_access_status); 898 899 rc = -ENOMEM; 900 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root, 901 &wwn->unit_serial[0], 902 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 903 if (path) { 904 rc = core_alua_write_tpg_metadata(path, md_buf, len); 905 kfree(path); 906 } 907 kfree(md_buf); 908 return rc; 909 } 910 911 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) 912 { 913 struct se_dev_entry *se_deve; 914 struct se_lun *lun; 915 struct se_lun_acl *lacl; 916 917 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 918 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, 919 lun_tg_pt_gp_link) { 920 /* 921 * After an implicit target port asymmetric access state 922 * change, a device server shall establish a unit attention 923 * condition for the initiator port associated with every I_T 924 * nexus with the additional sense code set to ASYMMETRIC 925 * ACCESS STATE CHANGED. 926 * 927 * After an explicit target port asymmetric access state 928 * change, a device server shall establish a unit attention 929 * condition with the additional sense code set to ASYMMETRIC 930 * ACCESS STATE CHANGED for the initiator port associated with 931 * every I_T nexus other than the I_T nexus on which the SET 932 * TARGET PORT GROUPS command 933 */ 934 if (!percpu_ref_tryget_live(&lun->lun_ref)) 935 continue; 936 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 937 938 spin_lock(&lun->lun_deve_lock); 939 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { 940 lacl = se_deve->se_lun_acl; 941 942 /* 943 * spc4r37 p.242: 944 * After an explicit target port asymmetric access 945 * state change, a device server shall establish a 946 * unit attention condition with the additional sense 947 * code set to ASYMMETRIC ACCESS STATE CHANGED for 948 * the initiator port associated with every I_T nexus 949 * other than the I_T nexus on which the SET TARGET 950 * PORT GROUPS command was received. 951 */ 952 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 953 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 954 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && 955 (tg_pt_gp->tg_pt_gp_alua_lun == lun)) 956 continue; 957 958 /* 959 * se_deve->se_lun_acl pointer may be NULL for a 960 * entry created without explicit Node+MappedLUN ACLs 961 */ 962 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 963 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) 964 continue; 965 966 core_scsi3_ua_allocate(se_deve, 0x2A, 967 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 968 } 969 spin_unlock(&lun->lun_deve_lock); 970 971 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 972 percpu_ref_put(&lun->lun_ref); 973 } 974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 975 } 976 977 static int core_alua_do_transition_tg_pt( 978 struct t10_alua_tg_pt_gp *tg_pt_gp, 979 int new_state, 980 int explicit) 981 { 982 int prev_state; 983 984 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex); 985 /* Nothing to be done here */ 986 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) { 987 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 988 return 0; 989 } 990 991 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) { 992 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 993 return -EAGAIN; 994 } 995 996 /* 997 * Save the old primary ALUA access state, and set the current state 998 * to ALUA_ACCESS_STATE_TRANSITION. 999 */ 1000 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state; 1001 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION; 1002 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1003 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1004 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1005 1006 core_alua_queue_state_change_ua(tg_pt_gp); 1007 1008 if (new_state == ALUA_ACCESS_STATE_TRANSITION) { 1009 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 1010 return 0; 1011 } 1012 1013 /* 1014 * Check for the optional ALUA primary state transition delay 1015 */ 1016 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1017 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1018 1019 /* 1020 * Set the current primary ALUA access state to the requested new state 1021 */ 1022 tg_pt_gp->tg_pt_gp_alua_access_state = new_state; 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 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1038 } 1039 1040 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1041 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1042 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1043 tg_pt_gp->tg_pt_gp_id, 1044 core_alua_dump_state(prev_state), 1045 core_alua_dump_state(new_state)); 1046 1047 core_alua_queue_state_change_ua(tg_pt_gp); 1048 1049 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); 1050 return 0; 1051 } 1052 1053 int core_alua_do_port_transition( 1054 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1055 struct se_device *l_dev, 1056 struct se_lun *l_lun, 1057 struct se_node_acl *l_nacl, 1058 int new_state, 1059 int explicit) 1060 { 1061 struct se_device *dev; 1062 struct t10_alua_lu_gp *lu_gp; 1063 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1064 struct t10_alua_tg_pt_gp *tg_pt_gp; 1065 int primary, valid_states, rc = 0; 1066 1067 if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) 1068 return -ENODEV; 1069 1070 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1071 if (core_alua_check_transition(new_state, valid_states, &primary, 1072 explicit) != 0) 1073 return -EINVAL; 1074 1075 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1076 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1077 lu_gp = local_lu_gp_mem->lu_gp; 1078 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1079 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1080 /* 1081 * For storage objects that are members of the 'default_lu_gp', 1082 * we only do transition on the passed *l_tp_pt_gp, and not 1083 * on all of the matching target port groups IDs in default_lu_gp. 1084 */ 1085 if (!lu_gp->lu_gp_id) { 1086 /* 1087 * core_alua_do_transition_tg_pt() will always return 1088 * success. 1089 */ 1090 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1091 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1092 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1093 new_state, explicit); 1094 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1095 return rc; 1096 } 1097 /* 1098 * For all other LU groups aside from 'default_lu_gp', walk all of 1099 * the associated storage objects looking for a matching target port 1100 * group ID from the local target port group. 1101 */ 1102 spin_lock(&lu_gp->lu_gp_lock); 1103 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1104 lu_gp_mem_list) { 1105 1106 dev = lu_gp_mem->lu_gp_mem_dev; 1107 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1108 spin_unlock(&lu_gp->lu_gp_lock); 1109 1110 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1111 list_for_each_entry(tg_pt_gp, 1112 &dev->t10_alua.tg_pt_gps_list, 1113 tg_pt_gp_list) { 1114 1115 if (!tg_pt_gp->tg_pt_gp_valid_id) 1116 continue; 1117 /* 1118 * If the target behavior port asymmetric access state 1119 * is changed for any target port group accessible via 1120 * a logical unit within a LU group, the target port 1121 * behavior group asymmetric access states for the same 1122 * target port group accessible via other logical units 1123 * in that LU group will also change. 1124 */ 1125 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1126 continue; 1127 1128 if (l_tg_pt_gp == tg_pt_gp) { 1129 tg_pt_gp->tg_pt_gp_alua_lun = l_lun; 1130 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1131 } else { 1132 tg_pt_gp->tg_pt_gp_alua_lun = NULL; 1133 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1134 } 1135 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1136 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1137 /* 1138 * core_alua_do_transition_tg_pt() will always return 1139 * success. 1140 */ 1141 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1142 new_state, explicit); 1143 1144 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1145 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1146 if (rc) 1147 break; 1148 } 1149 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1150 1151 spin_lock(&lu_gp->lu_gp_lock); 1152 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1153 } 1154 spin_unlock(&lu_gp->lu_gp_lock); 1155 1156 if (!rc) { 1157 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1158 " Group IDs: %hu %s transition to primary state: %s\n", 1159 config_item_name(&lu_gp->lu_gp_group.cg_item), 1160 l_tg_pt_gp->tg_pt_gp_id, 1161 (explicit) ? "explicit" : "implicit", 1162 core_alua_dump_state(new_state)); 1163 } 1164 1165 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1166 return rc; 1167 } 1168 1169 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) 1170 { 1171 struct se_portal_group *se_tpg = lun->lun_tpg; 1172 unsigned char *md_buf; 1173 char *path; 1174 int len, rc; 1175 1176 mutex_lock(&lun->lun_tg_pt_md_mutex); 1177 1178 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1179 if (!md_buf) { 1180 pr_err("Unable to allocate buf for ALUA metadata\n"); 1181 rc = -ENOMEM; 1182 goto out_unlock; 1183 } 1184 1185 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1186 "alua_tg_pt_status=0x%02x\n", 1187 atomic_read(&lun->lun_tg_pt_secondary_offline), 1188 lun->lun_tg_pt_secondary_stat); 1189 1190 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) { 1191 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu", 1192 db_root, se_tpg->se_tpg_tfo->fabric_name, 1193 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), 1194 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg), 1195 lun->unpacked_lun); 1196 } else { 1197 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu", 1198 db_root, se_tpg->se_tpg_tfo->fabric_name, 1199 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), 1200 lun->unpacked_lun); 1201 } 1202 if (!path) { 1203 rc = -ENOMEM; 1204 goto out_free; 1205 } 1206 1207 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1208 kfree(path); 1209 out_free: 1210 kfree(md_buf); 1211 out_unlock: 1212 mutex_unlock(&lun->lun_tg_pt_md_mutex); 1213 return rc; 1214 } 1215 1216 static int core_alua_set_tg_pt_secondary_state( 1217 struct se_lun *lun, 1218 int explicit, 1219 int offline) 1220 { 1221 struct t10_alua_tg_pt_gp *tg_pt_gp; 1222 int trans_delay_msecs; 1223 1224 rcu_read_lock(); 1225 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 1226 if (!tg_pt_gp) { 1227 rcu_read_unlock(); 1228 pr_err("Unable to complete secondary state" 1229 " transition\n"); 1230 return -EINVAL; 1231 } 1232 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1233 /* 1234 * Set the secondary ALUA target port access state to OFFLINE 1235 * or release the previously secondary state for struct se_lun 1236 */ 1237 if (offline) 1238 atomic_set(&lun->lun_tg_pt_secondary_offline, 1); 1239 else 1240 atomic_set(&lun->lun_tg_pt_secondary_offline, 0); 1241 1242 lun->lun_tg_pt_secondary_stat = (explicit) ? 1243 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1244 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1245 1246 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1247 " to secondary access state: %s\n", (explicit) ? "explicit" : 1248 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1249 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1250 1251 rcu_read_unlock(); 1252 /* 1253 * Do the optional transition delay after we set the secondary 1254 * ALUA access state. 1255 */ 1256 if (trans_delay_msecs != 0) 1257 msleep_interruptible(trans_delay_msecs); 1258 /* 1259 * See if we need to update the ALUA fabric port metadata for 1260 * secondary state and status 1261 */ 1262 if (lun->lun_tg_pt_secondary_write_md) 1263 core_alua_update_tpg_secondary_metadata(lun); 1264 1265 return 0; 1266 } 1267 1268 struct t10_alua_lba_map * 1269 core_alua_allocate_lba_map(struct list_head *list, 1270 u64 first_lba, u64 last_lba) 1271 { 1272 struct t10_alua_lba_map *lba_map; 1273 1274 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1275 if (!lba_map) { 1276 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1277 return ERR_PTR(-ENOMEM); 1278 } 1279 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1280 lba_map->lba_map_first_lba = first_lba; 1281 lba_map->lba_map_last_lba = last_lba; 1282 1283 list_add_tail(&lba_map->lba_map_list, list); 1284 return lba_map; 1285 } 1286 1287 int 1288 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1289 int pg_id, int state) 1290 { 1291 struct t10_alua_lba_map_member *lba_map_mem; 1292 1293 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1294 lba_map_mem_list) { 1295 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1296 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1297 return -EINVAL; 1298 } 1299 } 1300 1301 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1302 if (!lba_map_mem) { 1303 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1304 return -ENOMEM; 1305 } 1306 lba_map_mem->lba_map_mem_alua_state = state; 1307 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1308 1309 list_add_tail(&lba_map_mem->lba_map_mem_list, 1310 &lba_map->lba_map_mem_list); 1311 return 0; 1312 } 1313 1314 void 1315 core_alua_free_lba_map(struct list_head *lba_list) 1316 { 1317 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1318 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1319 1320 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1321 lba_map_list) { 1322 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1323 &lba_map->lba_map_mem_list, 1324 lba_map_mem_list) { 1325 list_del(&lba_map_mem->lba_map_mem_list); 1326 kmem_cache_free(t10_alua_lba_map_mem_cache, 1327 lba_map_mem); 1328 } 1329 list_del(&lba_map->lba_map_list); 1330 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1331 } 1332 } 1333 1334 void 1335 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1336 int segment_size, int segment_mult) 1337 { 1338 struct list_head old_lba_map_list; 1339 struct t10_alua_tg_pt_gp *tg_pt_gp; 1340 int activate = 0, supported; 1341 1342 INIT_LIST_HEAD(&old_lba_map_list); 1343 spin_lock(&dev->t10_alua.lba_map_lock); 1344 dev->t10_alua.lba_map_segment_size = segment_size; 1345 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1346 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1347 if (lba_map_list) { 1348 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1349 activate = 1; 1350 } 1351 spin_unlock(&dev->t10_alua.lba_map_lock); 1352 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1353 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1354 tg_pt_gp_list) { 1355 1356 if (!tg_pt_gp->tg_pt_gp_valid_id) 1357 continue; 1358 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1359 if (activate) 1360 supported |= ALUA_LBD_SUP; 1361 else 1362 supported &= ~ALUA_LBD_SUP; 1363 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1364 } 1365 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1366 core_alua_free_lba_map(&old_lba_map_list); 1367 } 1368 1369 struct t10_alua_lu_gp * 1370 core_alua_allocate_lu_gp(const char *name, int def_group) 1371 { 1372 struct t10_alua_lu_gp *lu_gp; 1373 1374 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1375 if (!lu_gp) { 1376 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1377 return ERR_PTR(-ENOMEM); 1378 } 1379 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1380 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1381 spin_lock_init(&lu_gp->lu_gp_lock); 1382 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1383 1384 if (def_group) { 1385 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1386 lu_gp->lu_gp_valid_id = 1; 1387 alua_lu_gps_count++; 1388 } 1389 1390 return lu_gp; 1391 } 1392 1393 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1394 { 1395 struct t10_alua_lu_gp *lu_gp_tmp; 1396 u16 lu_gp_id_tmp; 1397 /* 1398 * The lu_gp->lu_gp_id may only be set once.. 1399 */ 1400 if (lu_gp->lu_gp_valid_id) { 1401 pr_warn("ALUA LU Group already has a valid ID," 1402 " ignoring request\n"); 1403 return -EINVAL; 1404 } 1405 1406 spin_lock(&lu_gps_lock); 1407 if (alua_lu_gps_count == 0x0000ffff) { 1408 pr_err("Maximum ALUA alua_lu_gps_count:" 1409 " 0x0000ffff reached\n"); 1410 spin_unlock(&lu_gps_lock); 1411 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1412 return -ENOSPC; 1413 } 1414 again: 1415 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1416 alua_lu_gps_counter++; 1417 1418 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1419 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1420 if (!lu_gp_id) 1421 goto again; 1422 1423 pr_warn("ALUA Logical Unit Group ID: %hu" 1424 " already exists, ignoring request\n", 1425 lu_gp_id); 1426 spin_unlock(&lu_gps_lock); 1427 return -EINVAL; 1428 } 1429 } 1430 1431 lu_gp->lu_gp_id = lu_gp_id_tmp; 1432 lu_gp->lu_gp_valid_id = 1; 1433 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1434 alua_lu_gps_count++; 1435 spin_unlock(&lu_gps_lock); 1436 1437 return 0; 1438 } 1439 1440 static struct t10_alua_lu_gp_member * 1441 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1442 { 1443 struct t10_alua_lu_gp_member *lu_gp_mem; 1444 1445 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1446 if (!lu_gp_mem) { 1447 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1448 return ERR_PTR(-ENOMEM); 1449 } 1450 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1451 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1452 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1453 1454 lu_gp_mem->lu_gp_mem_dev = dev; 1455 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1456 1457 return lu_gp_mem; 1458 } 1459 1460 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1461 { 1462 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1463 /* 1464 * Once we have reached this point, config_item_put() has 1465 * already been called from target_core_alua_drop_lu_gp(). 1466 * 1467 * Here, we remove the *lu_gp from the global list so that 1468 * no associations can be made while we are releasing 1469 * struct t10_alua_lu_gp. 1470 */ 1471 spin_lock(&lu_gps_lock); 1472 list_del(&lu_gp->lu_gp_node); 1473 alua_lu_gps_count--; 1474 spin_unlock(&lu_gps_lock); 1475 /* 1476 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1477 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1478 * released with core_alua_put_lu_gp_from_name() 1479 */ 1480 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1481 cpu_relax(); 1482 /* 1483 * Release reference to struct t10_alua_lu_gp * from all associated 1484 * struct se_device. 1485 */ 1486 spin_lock(&lu_gp->lu_gp_lock); 1487 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1488 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1489 if (lu_gp_mem->lu_gp_assoc) { 1490 list_del(&lu_gp_mem->lu_gp_mem_list); 1491 lu_gp->lu_gp_members--; 1492 lu_gp_mem->lu_gp_assoc = 0; 1493 } 1494 spin_unlock(&lu_gp->lu_gp_lock); 1495 /* 1496 * 1497 * lu_gp_mem is associated with a single 1498 * struct se_device->dev_alua_lu_gp_mem, and is released when 1499 * struct se_device is released via core_alua_free_lu_gp_mem(). 1500 * 1501 * If the passed lu_gp does NOT match the default_lu_gp, assume 1502 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1503 */ 1504 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1505 if (lu_gp != default_lu_gp) 1506 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1507 default_lu_gp); 1508 else 1509 lu_gp_mem->lu_gp = NULL; 1510 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1511 1512 spin_lock(&lu_gp->lu_gp_lock); 1513 } 1514 spin_unlock(&lu_gp->lu_gp_lock); 1515 1516 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1517 } 1518 1519 void core_alua_free_lu_gp_mem(struct se_device *dev) 1520 { 1521 struct t10_alua_lu_gp *lu_gp; 1522 struct t10_alua_lu_gp_member *lu_gp_mem; 1523 1524 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1525 if (!lu_gp_mem) 1526 return; 1527 1528 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1529 cpu_relax(); 1530 1531 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1532 lu_gp = lu_gp_mem->lu_gp; 1533 if (lu_gp) { 1534 spin_lock(&lu_gp->lu_gp_lock); 1535 if (lu_gp_mem->lu_gp_assoc) { 1536 list_del(&lu_gp_mem->lu_gp_mem_list); 1537 lu_gp->lu_gp_members--; 1538 lu_gp_mem->lu_gp_assoc = 0; 1539 } 1540 spin_unlock(&lu_gp->lu_gp_lock); 1541 lu_gp_mem->lu_gp = NULL; 1542 } 1543 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1544 1545 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1546 } 1547 1548 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1549 { 1550 struct t10_alua_lu_gp *lu_gp; 1551 struct config_item *ci; 1552 1553 spin_lock(&lu_gps_lock); 1554 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1555 if (!lu_gp->lu_gp_valid_id) 1556 continue; 1557 ci = &lu_gp->lu_gp_group.cg_item; 1558 if (!strcmp(config_item_name(ci), name)) { 1559 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1560 spin_unlock(&lu_gps_lock); 1561 return lu_gp; 1562 } 1563 } 1564 spin_unlock(&lu_gps_lock); 1565 1566 return NULL; 1567 } 1568 1569 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1570 { 1571 spin_lock(&lu_gps_lock); 1572 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1573 spin_unlock(&lu_gps_lock); 1574 } 1575 1576 /* 1577 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1578 */ 1579 void __core_alua_attach_lu_gp_mem( 1580 struct t10_alua_lu_gp_member *lu_gp_mem, 1581 struct t10_alua_lu_gp *lu_gp) 1582 { 1583 spin_lock(&lu_gp->lu_gp_lock); 1584 lu_gp_mem->lu_gp = lu_gp; 1585 lu_gp_mem->lu_gp_assoc = 1; 1586 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1587 lu_gp->lu_gp_members++; 1588 spin_unlock(&lu_gp->lu_gp_lock); 1589 } 1590 1591 /* 1592 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1593 */ 1594 void __core_alua_drop_lu_gp_mem( 1595 struct t10_alua_lu_gp_member *lu_gp_mem, 1596 struct t10_alua_lu_gp *lu_gp) 1597 { 1598 spin_lock(&lu_gp->lu_gp_lock); 1599 list_del(&lu_gp_mem->lu_gp_mem_list); 1600 lu_gp_mem->lu_gp = NULL; 1601 lu_gp_mem->lu_gp_assoc = 0; 1602 lu_gp->lu_gp_members--; 1603 spin_unlock(&lu_gp->lu_gp_lock); 1604 } 1605 1606 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1607 const char *name, int def_group) 1608 { 1609 struct t10_alua_tg_pt_gp *tg_pt_gp; 1610 1611 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1612 if (!tg_pt_gp) { 1613 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1614 return NULL; 1615 } 1616 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1617 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); 1618 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex); 1619 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1620 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1621 tg_pt_gp->tg_pt_gp_dev = dev; 1622 tg_pt_gp->tg_pt_gp_alua_access_state = 1623 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED; 1624 /* 1625 * Enable both explicit and implicit ALUA support by default 1626 */ 1627 tg_pt_gp->tg_pt_gp_alua_access_type = 1628 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1629 /* 1630 * Set the default Active/NonOptimized Delay in milliseconds 1631 */ 1632 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1633 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1634 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1635 1636 /* 1637 * Enable all supported states 1638 */ 1639 tg_pt_gp->tg_pt_gp_alua_supported_states = 1640 ALUA_T_SUP | ALUA_O_SUP | 1641 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1642 1643 if (def_group) { 1644 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1645 tg_pt_gp->tg_pt_gp_id = 1646 dev->t10_alua.alua_tg_pt_gps_counter++; 1647 tg_pt_gp->tg_pt_gp_valid_id = 1; 1648 dev->t10_alua.alua_tg_pt_gps_count++; 1649 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1650 &dev->t10_alua.tg_pt_gps_list); 1651 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1652 } 1653 1654 return tg_pt_gp; 1655 } 1656 1657 int core_alua_set_tg_pt_gp_id( 1658 struct t10_alua_tg_pt_gp *tg_pt_gp, 1659 u16 tg_pt_gp_id) 1660 { 1661 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1662 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1663 u16 tg_pt_gp_id_tmp; 1664 1665 /* 1666 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1667 */ 1668 if (tg_pt_gp->tg_pt_gp_valid_id) { 1669 pr_warn("ALUA TG PT Group already has a valid ID," 1670 " ignoring request\n"); 1671 return -EINVAL; 1672 } 1673 1674 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1675 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1676 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1677 " 0x0000ffff reached\n"); 1678 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1679 return -ENOSPC; 1680 } 1681 again: 1682 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1683 dev->t10_alua.alua_tg_pt_gps_counter++; 1684 1685 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1686 tg_pt_gp_list) { 1687 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1688 if (!tg_pt_gp_id) 1689 goto again; 1690 1691 pr_err("ALUA Target Port Group ID: %hu already" 1692 " exists, ignoring request\n", tg_pt_gp_id); 1693 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1694 return -EINVAL; 1695 } 1696 } 1697 1698 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1699 tg_pt_gp->tg_pt_gp_valid_id = 1; 1700 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1701 &dev->t10_alua.tg_pt_gps_list); 1702 dev->t10_alua.alua_tg_pt_gps_count++; 1703 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1704 1705 return 0; 1706 } 1707 1708 void core_alua_free_tg_pt_gp( 1709 struct t10_alua_tg_pt_gp *tg_pt_gp) 1710 { 1711 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1712 struct se_lun *lun, *next; 1713 1714 /* 1715 * Once we have reached this point, config_item_put() has already 1716 * been called from target_core_alua_drop_tg_pt_gp(). 1717 * 1718 * Here we remove *tg_pt_gp from the global list so that 1719 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1720 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1721 */ 1722 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1723 if (tg_pt_gp->tg_pt_gp_valid_id) { 1724 list_del(&tg_pt_gp->tg_pt_gp_list); 1725 dev->t10_alua.alua_tg_pt_gps_count--; 1726 } 1727 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1728 1729 /* 1730 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1731 * core_alua_get_tg_pt_gp_by_name() in 1732 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1733 * to be released with core_alua_put_tg_pt_gp_from_name(). 1734 */ 1735 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1736 cpu_relax(); 1737 1738 /* 1739 * Release reference to struct t10_alua_tg_pt_gp from all associated 1740 * struct se_port. 1741 */ 1742 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1743 list_for_each_entry_safe(lun, next, 1744 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { 1745 list_del_init(&lun->lun_tg_pt_gp_link); 1746 tg_pt_gp->tg_pt_gp_members--; 1747 1748 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1749 /* 1750 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1751 * assume we want to re-associate a given tg_pt_gp_mem with 1752 * default_tg_pt_gp. 1753 */ 1754 spin_lock(&lun->lun_tg_pt_gp_lock); 1755 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1756 __target_attach_tg_pt_gp(lun, 1757 dev->t10_alua.default_tg_pt_gp); 1758 } else 1759 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL); 1760 spin_unlock(&lun->lun_tg_pt_gp_lock); 1761 1762 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1763 } 1764 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1765 1766 synchronize_rcu(); 1767 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1768 } 1769 1770 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1771 struct se_device *dev, const char *name) 1772 { 1773 struct t10_alua_tg_pt_gp *tg_pt_gp; 1774 struct config_item *ci; 1775 1776 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1777 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1778 tg_pt_gp_list) { 1779 if (!tg_pt_gp->tg_pt_gp_valid_id) 1780 continue; 1781 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1782 if (!strcmp(config_item_name(ci), name)) { 1783 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1784 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1785 return tg_pt_gp; 1786 } 1787 } 1788 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1789 1790 return NULL; 1791 } 1792 1793 static void core_alua_put_tg_pt_gp_from_name( 1794 struct t10_alua_tg_pt_gp *tg_pt_gp) 1795 { 1796 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1797 1798 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1799 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1800 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1801 } 1802 1803 static void __target_attach_tg_pt_gp(struct se_lun *lun, 1804 struct t10_alua_tg_pt_gp *tg_pt_gp) 1805 { 1806 struct se_dev_entry *se_deve; 1807 1808 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1809 1810 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1811 rcu_assign_pointer(lun->lun_tg_pt_gp, tg_pt_gp); 1812 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); 1813 tg_pt_gp->tg_pt_gp_members++; 1814 spin_lock(&lun->lun_deve_lock); 1815 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) 1816 core_scsi3_ua_allocate(se_deve, 0x3f, 1817 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); 1818 spin_unlock(&lun->lun_deve_lock); 1819 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1820 } 1821 1822 void target_attach_tg_pt_gp(struct se_lun *lun, 1823 struct t10_alua_tg_pt_gp *tg_pt_gp) 1824 { 1825 spin_lock(&lun->lun_tg_pt_gp_lock); 1826 __target_attach_tg_pt_gp(lun, tg_pt_gp); 1827 spin_unlock(&lun->lun_tg_pt_gp_lock); 1828 synchronize_rcu(); 1829 } 1830 1831 static void __target_detach_tg_pt_gp(struct se_lun *lun, 1832 struct t10_alua_tg_pt_gp *tg_pt_gp) 1833 { 1834 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1835 1836 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1837 list_del_init(&lun->lun_tg_pt_gp_link); 1838 tg_pt_gp->tg_pt_gp_members--; 1839 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1840 } 1841 1842 void target_detach_tg_pt_gp(struct se_lun *lun) 1843 { 1844 struct t10_alua_tg_pt_gp *tg_pt_gp; 1845 1846 spin_lock(&lun->lun_tg_pt_gp_lock); 1847 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp, 1848 lockdep_is_held(&lun->lun_tg_pt_gp_lock)); 1849 if (tg_pt_gp) { 1850 __target_detach_tg_pt_gp(lun, tg_pt_gp); 1851 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL); 1852 } 1853 spin_unlock(&lun->lun_tg_pt_gp_lock); 1854 synchronize_rcu(); 1855 } 1856 1857 static void target_swap_tg_pt_gp(struct se_lun *lun, 1858 struct t10_alua_tg_pt_gp *old_tg_pt_gp, 1859 struct t10_alua_tg_pt_gp *new_tg_pt_gp) 1860 { 1861 assert_spin_locked(&lun->lun_tg_pt_gp_lock); 1862 1863 if (old_tg_pt_gp) 1864 __target_detach_tg_pt_gp(lun, old_tg_pt_gp); 1865 __target_attach_tg_pt_gp(lun, new_tg_pt_gp); 1866 } 1867 1868 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) 1869 { 1870 struct config_item *tg_pt_ci; 1871 struct t10_alua_tg_pt_gp *tg_pt_gp; 1872 ssize_t len = 0; 1873 1874 rcu_read_lock(); 1875 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 1876 if (tg_pt_gp) { 1877 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1878 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1879 " %hu\nTG Port Primary Access State: %s\nTG Port " 1880 "Primary Access Status: %s\nTG Port Secondary Access" 1881 " State: %s\nTG Port Secondary Access Status: %s\n", 1882 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1883 core_alua_dump_state( 1884 tg_pt_gp->tg_pt_gp_alua_access_state), 1885 core_alua_dump_status( 1886 tg_pt_gp->tg_pt_gp_alua_access_status), 1887 atomic_read(&lun->lun_tg_pt_secondary_offline) ? 1888 "Offline" : "None", 1889 core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); 1890 } 1891 rcu_read_unlock(); 1892 1893 return len; 1894 } 1895 1896 ssize_t core_alua_store_tg_pt_gp_info( 1897 struct se_lun *lun, 1898 const char *page, 1899 size_t count) 1900 { 1901 struct se_portal_group *tpg = lun->lun_tpg; 1902 /* 1903 * rcu_dereference_raw protected by se_lun->lun_group symlink 1904 * reference to se_device->dev_group. 1905 */ 1906 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 1907 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1908 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1909 int move = 0; 1910 1911 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 1912 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 1913 return -ENODEV; 1914 1915 if (count > TG_PT_GROUP_NAME_BUF) { 1916 pr_err("ALUA Target Port Group alias too large!\n"); 1917 return -EINVAL; 1918 } 1919 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1920 memcpy(buf, page, count); 1921 /* 1922 * Any ALUA target port group alias besides "NULL" means we will be 1923 * making a new group association. 1924 */ 1925 if (strcmp(strstrip(buf), "NULL")) { 1926 /* 1927 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1928 * struct t10_alua_tg_pt_gp. This reference is released with 1929 * core_alua_put_tg_pt_gp_from_name() below. 1930 */ 1931 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1932 strstrip(buf)); 1933 if (!tg_pt_gp_new) 1934 return -ENODEV; 1935 } 1936 1937 spin_lock(&lun->lun_tg_pt_gp_lock); 1938 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp, 1939 lockdep_is_held(&lun->lun_tg_pt_gp_lock)); 1940 if (tg_pt_gp) { 1941 /* 1942 * Clearing an existing tg_pt_gp association, and replacing 1943 * with the default_tg_pt_gp. 1944 */ 1945 if (!tg_pt_gp_new) { 1946 pr_debug("Target_Core_ConfigFS: Moving" 1947 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 1948 " alua/%s, ID: %hu back to" 1949 " default_tg_pt_gp\n", 1950 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1951 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1952 config_item_name(&lun->lun_group.cg_item), 1953 config_item_name( 1954 &tg_pt_gp->tg_pt_gp_group.cg_item), 1955 tg_pt_gp->tg_pt_gp_id); 1956 1957 target_swap_tg_pt_gp(lun, tg_pt_gp, 1958 dev->t10_alua.default_tg_pt_gp); 1959 spin_unlock(&lun->lun_tg_pt_gp_lock); 1960 1961 goto sync_rcu; 1962 } 1963 move = 1; 1964 } 1965 1966 target_swap_tg_pt_gp(lun, tg_pt_gp, tg_pt_gp_new); 1967 spin_unlock(&lun->lun_tg_pt_gp_lock); 1968 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 1969 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 1970 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1971 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1972 config_item_name(&lun->lun_group.cg_item), 1973 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 1974 tg_pt_gp_new->tg_pt_gp_id); 1975 1976 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 1977 sync_rcu: 1978 synchronize_rcu(); 1979 return count; 1980 } 1981 1982 ssize_t core_alua_show_access_type( 1983 struct t10_alua_tg_pt_gp *tg_pt_gp, 1984 char *page) 1985 { 1986 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 1987 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 1988 return sprintf(page, "Implicit and Explicit\n"); 1989 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 1990 return sprintf(page, "Implicit\n"); 1991 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 1992 return sprintf(page, "Explicit\n"); 1993 else 1994 return sprintf(page, "None\n"); 1995 } 1996 1997 ssize_t core_alua_store_access_type( 1998 struct t10_alua_tg_pt_gp *tg_pt_gp, 1999 const char *page, 2000 size_t count) 2001 { 2002 unsigned long tmp; 2003 int ret; 2004 2005 ret = kstrtoul(page, 0, &tmp); 2006 if (ret < 0) { 2007 pr_err("Unable to extract alua_access_type\n"); 2008 return ret; 2009 } 2010 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2011 pr_err("Illegal value for alua_access_type:" 2012 " %lu\n", tmp); 2013 return -EINVAL; 2014 } 2015 if (tmp == 3) 2016 tg_pt_gp->tg_pt_gp_alua_access_type = 2017 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2018 else if (tmp == 2) 2019 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2020 else if (tmp == 1) 2021 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2022 else 2023 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2024 2025 return count; 2026 } 2027 2028 ssize_t core_alua_show_nonop_delay_msecs( 2029 struct t10_alua_tg_pt_gp *tg_pt_gp, 2030 char *page) 2031 { 2032 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2033 } 2034 2035 ssize_t core_alua_store_nonop_delay_msecs( 2036 struct t10_alua_tg_pt_gp *tg_pt_gp, 2037 const char *page, 2038 size_t count) 2039 { 2040 unsigned long tmp; 2041 int ret; 2042 2043 ret = kstrtoul(page, 0, &tmp); 2044 if (ret < 0) { 2045 pr_err("Unable to extract nonop_delay_msecs\n"); 2046 return ret; 2047 } 2048 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2049 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2050 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2051 ALUA_MAX_NONOP_DELAY_MSECS); 2052 return -EINVAL; 2053 } 2054 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2055 2056 return count; 2057 } 2058 2059 ssize_t core_alua_show_trans_delay_msecs( 2060 struct t10_alua_tg_pt_gp *tg_pt_gp, 2061 char *page) 2062 { 2063 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2064 } 2065 2066 ssize_t core_alua_store_trans_delay_msecs( 2067 struct t10_alua_tg_pt_gp *tg_pt_gp, 2068 const char *page, 2069 size_t count) 2070 { 2071 unsigned long tmp; 2072 int ret; 2073 2074 ret = kstrtoul(page, 0, &tmp); 2075 if (ret < 0) { 2076 pr_err("Unable to extract trans_delay_msecs\n"); 2077 return ret; 2078 } 2079 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2080 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2081 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2082 ALUA_MAX_TRANS_DELAY_MSECS); 2083 return -EINVAL; 2084 } 2085 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2086 2087 return count; 2088 } 2089 2090 ssize_t core_alua_show_implicit_trans_secs( 2091 struct t10_alua_tg_pt_gp *tg_pt_gp, 2092 char *page) 2093 { 2094 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2095 } 2096 2097 ssize_t core_alua_store_implicit_trans_secs( 2098 struct t10_alua_tg_pt_gp *tg_pt_gp, 2099 const char *page, 2100 size_t count) 2101 { 2102 unsigned long tmp; 2103 int ret; 2104 2105 ret = kstrtoul(page, 0, &tmp); 2106 if (ret < 0) { 2107 pr_err("Unable to extract implicit_trans_secs\n"); 2108 return ret; 2109 } 2110 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2111 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2112 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2113 ALUA_MAX_IMPLICIT_TRANS_SECS); 2114 return -EINVAL; 2115 } 2116 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2117 2118 return count; 2119 } 2120 2121 ssize_t core_alua_show_preferred_bit( 2122 struct t10_alua_tg_pt_gp *tg_pt_gp, 2123 char *page) 2124 { 2125 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2126 } 2127 2128 ssize_t core_alua_store_preferred_bit( 2129 struct t10_alua_tg_pt_gp *tg_pt_gp, 2130 const char *page, 2131 size_t count) 2132 { 2133 unsigned long tmp; 2134 int ret; 2135 2136 ret = kstrtoul(page, 0, &tmp); 2137 if (ret < 0) { 2138 pr_err("Unable to extract preferred ALUA value\n"); 2139 return ret; 2140 } 2141 if ((tmp != 0) && (tmp != 1)) { 2142 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2143 return -EINVAL; 2144 } 2145 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2146 2147 return count; 2148 } 2149 2150 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2151 { 2152 return sprintf(page, "%d\n", 2153 atomic_read(&lun->lun_tg_pt_secondary_offline)); 2154 } 2155 2156 ssize_t core_alua_store_offline_bit( 2157 struct se_lun *lun, 2158 const char *page, 2159 size_t count) 2160 { 2161 /* 2162 * rcu_dereference_raw protected by se_lun->lun_group symlink 2163 * reference to se_device->dev_group. 2164 */ 2165 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); 2166 unsigned long tmp; 2167 int ret; 2168 2169 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA || 2170 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) 2171 return -ENODEV; 2172 2173 ret = kstrtoul(page, 0, &tmp); 2174 if (ret < 0) { 2175 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2176 return ret; 2177 } 2178 if ((tmp != 0) && (tmp != 1)) { 2179 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2180 tmp); 2181 return -EINVAL; 2182 } 2183 2184 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp); 2185 if (ret < 0) 2186 return -EINVAL; 2187 2188 return count; 2189 } 2190 2191 ssize_t core_alua_show_secondary_status( 2192 struct se_lun *lun, 2193 char *page) 2194 { 2195 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat); 2196 } 2197 2198 ssize_t core_alua_store_secondary_status( 2199 struct se_lun *lun, 2200 const char *page, 2201 size_t count) 2202 { 2203 unsigned long tmp; 2204 int ret; 2205 2206 ret = kstrtoul(page, 0, &tmp); 2207 if (ret < 0) { 2208 pr_err("Unable to extract alua_tg_pt_status\n"); 2209 return ret; 2210 } 2211 if ((tmp != ALUA_STATUS_NONE) && 2212 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2213 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2214 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2215 tmp); 2216 return -EINVAL; 2217 } 2218 lun->lun_tg_pt_secondary_stat = (int)tmp; 2219 2220 return count; 2221 } 2222 2223 ssize_t core_alua_show_secondary_write_metadata( 2224 struct se_lun *lun, 2225 char *page) 2226 { 2227 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md); 2228 } 2229 2230 ssize_t core_alua_store_secondary_write_metadata( 2231 struct se_lun *lun, 2232 const char *page, 2233 size_t count) 2234 { 2235 unsigned long tmp; 2236 int ret; 2237 2238 ret = kstrtoul(page, 0, &tmp); 2239 if (ret < 0) { 2240 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2241 return ret; 2242 } 2243 if ((tmp != 0) && (tmp != 1)) { 2244 pr_err("Illegal value for alua_tg_pt_write_md:" 2245 " %lu\n", tmp); 2246 return -EINVAL; 2247 } 2248 lun->lun_tg_pt_secondary_write_md = (int)tmp; 2249 2250 return count; 2251 } 2252 2253 int core_setup_alua(struct se_device *dev) 2254 { 2255 if (!(dev->transport_flags & 2256 TRANSPORT_FLAG_PASSTHROUGH_ALUA) && 2257 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2258 struct t10_alua_lu_gp_member *lu_gp_mem; 2259 2260 /* 2261 * Associate this struct se_device with the default ALUA 2262 * LUN Group. 2263 */ 2264 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2265 if (IS_ERR(lu_gp_mem)) 2266 return PTR_ERR(lu_gp_mem); 2267 2268 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2269 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2270 default_lu_gp); 2271 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2272 2273 pr_debug("%s: Adding to default ALUA LU Group:" 2274 " core/alua/lu_gps/default_lu_gp\n", 2275 dev->transport->name); 2276 } 2277 2278 return 0; 2279 } 2280