1/******************************************************************************* 2 * Filename: target_core_alua.c 3 * 4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) 5 * 6 * (c) Copyright 2009-2013 Datera, Inc. 7 * 8 * Nicholas A. Bellinger <nab@kernel.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 ******************************************************************************/ 25 26#include <linux/slab.h> 27#include <linux/spinlock.h> 28#include <linux/configfs.h> 29#include <linux/export.h> 30#include <linux/file.h> 31#include <scsi/scsi.h> 32#include <scsi/scsi_cmnd.h> 33#include <asm/unaligned.h> 34 35#include <target/target_core_base.h> 36#include <target/target_core_backend.h> 37#include <target/target_core_fabric.h> 38#include <target/target_core_configfs.h> 39 40#include "target_core_internal.h" 41#include "target_core_alua.h" 42#include "target_core_ua.h" 43 44static sense_reason_t core_alua_check_transition(int state, int valid, 45 int *primary); 46static int core_alua_set_tg_pt_secondary_state( 47 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 48 struct se_port *port, int explicit, int offline); 49 50static char *core_alua_dump_state(int state); 51 52static u16 alua_lu_gps_counter; 53static u32 alua_lu_gps_count; 54 55static DEFINE_SPINLOCK(lu_gps_lock); 56static LIST_HEAD(lu_gps_list); 57 58struct t10_alua_lu_gp *default_lu_gp; 59 60/* 61 * REPORT REFERRALS 62 * 63 * See sbc3r35 section 5.23 64 */ 65sense_reason_t 66target_emulate_report_referrals(struct se_cmd *cmd) 67{ 68 struct se_device *dev = cmd->se_dev; 69 struct t10_alua_lba_map *map; 70 struct t10_alua_lba_map_member *map_mem; 71 unsigned char *buf; 72 u32 rd_len = 0, off; 73 74 if (cmd->data_length < 4) { 75 pr_warn("REPORT REFERRALS allocation length %u too" 76 " small\n", cmd->data_length); 77 return TCM_INVALID_CDB_FIELD; 78 } 79 80 buf = transport_kmap_data_sg(cmd); 81 if (!buf) 82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 83 84 off = 4; 85 spin_lock(&dev->t10_alua.lba_map_lock); 86 if (list_empty(&dev->t10_alua.lba_map_list)) { 87 spin_unlock(&dev->t10_alua.lba_map_lock); 88 transport_kunmap_data_sg(cmd); 89 90 return TCM_UNSUPPORTED_SCSI_OPCODE; 91 } 92 93 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 94 lba_map_list) { 95 int desc_num = off + 3; 96 int pg_num; 97 98 off += 4; 99 if (cmd->data_length > off) 100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 101 off += 8; 102 if (cmd->data_length > off) 103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 104 off += 8; 105 rd_len += 20; 106 pg_num = 0; 107 list_for_each_entry(map_mem, &map->lba_map_mem_list, 108 lba_map_mem_list) { 109 int alua_state = map_mem->lba_map_mem_alua_state; 110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 111 112 if (cmd->data_length > off) 113 buf[off] = alua_state & 0x0f; 114 off += 2; 115 if (cmd->data_length > off) 116 buf[off] = (alua_pg_id >> 8) & 0xff; 117 off++; 118 if (cmd->data_length > off) 119 buf[off] = (alua_pg_id & 0xff); 120 off++; 121 rd_len += 4; 122 pg_num++; 123 } 124 if (cmd->data_length > desc_num) 125 buf[desc_num] = pg_num; 126 } 127 spin_unlock(&dev->t10_alua.lba_map_lock); 128 129 /* 130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 131 */ 132 put_unaligned_be16(rd_len, &buf[2]); 133 134 transport_kunmap_data_sg(cmd); 135 136 target_complete_cmd(cmd, GOOD); 137 return 0; 138} 139 140/* 141 * REPORT_TARGET_PORT_GROUPS 142 * 143 * See spc4r17 section 6.27 144 */ 145sense_reason_t 146target_emulate_report_target_port_groups(struct se_cmd *cmd) 147{ 148 struct se_device *dev = cmd->se_dev; 149 struct se_port *port; 150 struct t10_alua_tg_pt_gp *tg_pt_gp; 151 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 152 unsigned char *buf; 153 u32 rd_len = 0, off; 154 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 155 156 /* 157 * Skip over RESERVED area to first Target port group descriptor 158 * depending on the PARAMETER DATA FORMAT type.. 159 */ 160 if (ext_hdr != 0) 161 off = 8; 162 else 163 off = 4; 164 165 if (cmd->data_length < off) { 166 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 167 " small for %s header\n", cmd->data_length, 168 (ext_hdr) ? "extended" : "normal"); 169 return TCM_INVALID_CDB_FIELD; 170 } 171 buf = transport_kmap_data_sg(cmd); 172 if (!buf) 173 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 174 175 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 176 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 177 tg_pt_gp_list) { 178 /* 179 * Check if the Target port group and Target port descriptor list 180 * based on tg_pt_gp_members count will fit into the response payload. 181 * Otherwise, bump rd_len to let the initiator know we have exceeded 182 * the allocation length and the response is truncated. 183 */ 184 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 185 cmd->data_length) { 186 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 187 continue; 188 } 189 /* 190 * PREF: Preferred target port bit, determine if this 191 * bit should be set for port group. 192 */ 193 if (tg_pt_gp->tg_pt_gp_pref) 194 buf[off] = 0x80; 195 /* 196 * Set the ASYMMETRIC ACCESS State 197 */ 198 buf[off++] |= (atomic_read( 199 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 200 /* 201 * Set supported ASYMMETRIC ACCESS State bits 202 */ 203 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 204 /* 205 * TARGET PORT GROUP 206 */ 207 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 208 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 209 210 off++; /* Skip over Reserved */ 211 /* 212 * STATUS CODE 213 */ 214 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 215 /* 216 * Vendor Specific field 217 */ 218 buf[off++] = 0x00; 219 /* 220 * TARGET PORT COUNT 221 */ 222 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 223 rd_len += 8; 224 225 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 226 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, 227 tg_pt_gp_mem_list) { 228 port = tg_pt_gp_mem->tg_pt; 229 /* 230 * Start Target Port descriptor format 231 * 232 * See spc4r17 section 6.2.7 Table 247 233 */ 234 off += 2; /* Skip over Obsolete */ 235 /* 236 * Set RELATIVE TARGET PORT IDENTIFIER 237 */ 238 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 239 buf[off++] = (port->sep_rtpi & 0xff); 240 rd_len += 4; 241 } 242 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 243 } 244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 245 /* 246 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 247 */ 248 put_unaligned_be32(rd_len, &buf[0]); 249 250 /* 251 * Fill in the Extended header parameter data format if requested 252 */ 253 if (ext_hdr != 0) { 254 buf[4] = 0x10; 255 /* 256 * Set the implicit transition time (in seconds) for the application 257 * client to use as a base for it's transition timeout value. 258 * 259 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 260 * this CDB was received upon to determine this value individually 261 * for ALUA target port group. 262 */ 263 port = cmd->se_lun->lun_sep; 264 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 265 if (tg_pt_gp_mem) { 266 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 267 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 268 if (tg_pt_gp) 269 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 270 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 271 } 272 } 273 transport_kunmap_data_sg(cmd); 274 275 target_complete_cmd(cmd, GOOD); 276 return 0; 277} 278 279/* 280 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 281 * 282 * See spc4r17 section 6.35 283 */ 284sense_reason_t 285target_emulate_set_target_port_groups(struct se_cmd *cmd) 286{ 287 struct se_device *dev = cmd->se_dev; 288 struct se_port *port, *l_port = cmd->se_lun->lun_sep; 289 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 290 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 291 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; 292 unsigned char *buf; 293 unsigned char *ptr; 294 sense_reason_t rc = TCM_NO_SENSE; 295 u32 len = 4; /* Skip over RESERVED area in header */ 296 int alua_access_state, primary = 0, valid_states; 297 u16 tg_pt_id, rtpi; 298 299 if (!l_port) 300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 301 302 if (cmd->data_length < 4) { 303 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 304 " small\n", cmd->data_length); 305 return TCM_INVALID_PARAMETER_LIST; 306 } 307 308 buf = transport_kmap_data_sg(cmd); 309 if (!buf) 310 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 311 312 /* 313 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 314 * for the local tg_pt_gp. 315 */ 316 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; 317 if (!l_tg_pt_gp_mem) { 318 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); 319 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 320 goto out; 321 } 322 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 323 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; 324 if (!l_tg_pt_gp) { 325 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 326 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); 327 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 328 goto out; 329 } 330 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 331 332 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 333 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 334 " while TPGS_EXPLICIT_ALUA is disabled\n"); 335 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 336 goto out; 337 } 338 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 339 340 ptr = &buf[4]; /* Skip over RESERVED area in header */ 341 342 while (len < cmd->data_length) { 343 bool found = false; 344 alua_access_state = (ptr[0] & 0x0f); 345 /* 346 * Check the received ALUA access state, and determine if 347 * the state is a primary or secondary target port asymmetric 348 * access state. 349 */ 350 rc = core_alua_check_transition(alua_access_state, 351 valid_states, &primary); 352 if (rc) { 353 /* 354 * If the SET TARGET PORT GROUPS attempts to establish 355 * an invalid combination of target port asymmetric 356 * access states or attempts to establish an 357 * unsupported target port asymmetric access state, 358 * then the command shall be terminated with CHECK 359 * CONDITION status, with the sense key set to ILLEGAL 360 * REQUEST, and the additional sense code set to INVALID 361 * FIELD IN PARAMETER LIST. 362 */ 363 goto out; 364 } 365 366 /* 367 * If the ASYMMETRIC ACCESS STATE field (see table 267) 368 * specifies a primary target port asymmetric access state, 369 * then the TARGET PORT GROUP OR TARGET PORT field specifies 370 * a primary target port group for which the primary target 371 * port asymmetric access state shall be changed. If the 372 * ASYMMETRIC ACCESS STATE field specifies a secondary target 373 * port asymmetric access state, then the TARGET PORT GROUP OR 374 * TARGET PORT field specifies the relative target port 375 * identifier (see 3.1.120) of the target port for which the 376 * secondary target port asymmetric access state shall be 377 * changed. 378 */ 379 if (primary) { 380 tg_pt_id = get_unaligned_be16(ptr + 2); 381 /* 382 * Locate the matching target port group ID from 383 * the global tg_pt_gp list 384 */ 385 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 386 list_for_each_entry(tg_pt_gp, 387 &dev->t10_alua.tg_pt_gps_list, 388 tg_pt_gp_list) { 389 if (!tg_pt_gp->tg_pt_gp_valid_id) 390 continue; 391 392 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 393 continue; 394 395 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 396 397 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 398 399 if (!core_alua_do_port_transition(tg_pt_gp, 400 dev, l_port, nacl, 401 alua_access_state, 1)) 402 found = true; 403 404 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 405 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 406 break; 407 } 408 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 409 } else { 410 /* 411 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 412 * the Target Port in question for the the incoming 413 * SET_TARGET_PORT_GROUPS op. 414 */ 415 rtpi = get_unaligned_be16(ptr + 2); 416 /* 417 * Locate the matching relative target port identifier 418 * for the struct se_device storage object. 419 */ 420 spin_lock(&dev->se_port_lock); 421 list_for_each_entry(port, &dev->dev_sep_list, 422 sep_list) { 423 if (port->sep_rtpi != rtpi) 424 continue; 425 426 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 427 428 spin_unlock(&dev->se_port_lock); 429 430 if (!core_alua_set_tg_pt_secondary_state( 431 tg_pt_gp_mem, port, 1, 1)) 432 found = true; 433 434 spin_lock(&dev->se_port_lock); 435 break; 436 } 437 spin_unlock(&dev->se_port_lock); 438 } 439 440 if (!found) { 441 rc = TCM_INVALID_PARAMETER_LIST; 442 goto out; 443 } 444 445 ptr += 4; 446 len += 4; 447 } 448 449out: 450 transport_kunmap_data_sg(cmd); 451 if (!rc) 452 target_complete_cmd(cmd, GOOD); 453 return rc; 454} 455 456static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq) 457{ 458 /* 459 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 460 * The ALUA additional sense code qualifier (ASCQ) is determined 461 * by the ALUA primary or secondary access state.. 462 */ 463 pr_debug("[%s]: ALUA TG Port not available, " 464 "SenseKey: NOT_READY, ASC/ASCQ: " 465 "0x04/0x%02x\n", 466 cmd->se_tfo->get_fabric_name(), alua_ascq); 467 468 cmd->scsi_asc = 0x04; 469 cmd->scsi_ascq = alua_ascq; 470} 471 472static inline void core_alua_state_nonoptimized( 473 struct se_cmd *cmd, 474 unsigned char *cdb, 475 int nonop_delay_msecs) 476{ 477 /* 478 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 479 * later to determine if processing of this cmd needs to be 480 * temporarily delayed for the Active/NonOptimized primary access state. 481 */ 482 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 483 cmd->alua_nonop_delay = nonop_delay_msecs; 484} 485 486static inline int core_alua_state_lba_dependent( 487 struct se_cmd *cmd, 488 struct t10_alua_tg_pt_gp *tg_pt_gp) 489{ 490 struct se_device *dev = cmd->se_dev; 491 u64 segment_size, segment_mult, sectors, lba; 492 493 /* Only need to check for cdb actually containing LBAs */ 494 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 495 return 0; 496 497 spin_lock(&dev->t10_alua.lba_map_lock); 498 segment_size = dev->t10_alua.lba_map_segment_size; 499 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 500 sectors = cmd->data_length / dev->dev_attrib.block_size; 501 502 lba = cmd->t_task_lba; 503 while (lba < cmd->t_task_lba + sectors) { 504 struct t10_alua_lba_map *cur_map = NULL, *map; 505 struct t10_alua_lba_map_member *map_mem; 506 507 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 508 lba_map_list) { 509 u64 start_lba, last_lba; 510 u64 first_lba = map->lba_map_first_lba; 511 512 if (segment_mult) { 513 u64 tmp = lba; 514 start_lba = do_div(tmp, segment_size * segment_mult); 515 516 last_lba = first_lba + segment_size - 1; 517 if (start_lba >= first_lba && 518 start_lba <= last_lba) { 519 lba += segment_size; 520 cur_map = map; 521 break; 522 } 523 } else { 524 last_lba = map->lba_map_last_lba; 525 if (lba >= first_lba && lba <= last_lba) { 526 lba = last_lba + 1; 527 cur_map = map; 528 break; 529 } 530 } 531 } 532 if (!cur_map) { 533 spin_unlock(&dev->t10_alua.lba_map_lock); 534 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 535 return 1; 536 } 537 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 538 lba_map_mem_list) { 539 if (map_mem->lba_map_mem_alua_pg_id != 540 tg_pt_gp->tg_pt_gp_id) 541 continue; 542 switch(map_mem->lba_map_mem_alua_state) { 543 case ALUA_ACCESS_STATE_STANDBY: 544 spin_unlock(&dev->t10_alua.lba_map_lock); 545 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 546 return 1; 547 case ALUA_ACCESS_STATE_UNAVAILABLE: 548 spin_unlock(&dev->t10_alua.lba_map_lock); 549 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 550 return 1; 551 default: 552 break; 553 } 554 } 555 } 556 spin_unlock(&dev->t10_alua.lba_map_lock); 557 return 0; 558} 559 560static inline int core_alua_state_standby( 561 struct se_cmd *cmd, 562 unsigned char *cdb) 563{ 564 /* 565 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 566 * spc4r17 section 5.9.2.4.4 567 */ 568 switch (cdb[0]) { 569 case INQUIRY: 570 case LOG_SELECT: 571 case LOG_SENSE: 572 case MODE_SELECT: 573 case MODE_SENSE: 574 case REPORT_LUNS: 575 case RECEIVE_DIAGNOSTIC: 576 case SEND_DIAGNOSTIC: 577 case READ_CAPACITY: 578 return 0; 579 case SERVICE_ACTION_IN: 580 switch (cdb[1] & 0x1f) { 581 case SAI_READ_CAPACITY_16: 582 return 0; 583 default: 584 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 585 return 1; 586 } 587 case MAINTENANCE_IN: 588 switch (cdb[1] & 0x1f) { 589 case MI_REPORT_TARGET_PGS: 590 return 0; 591 default: 592 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 593 return 1; 594 } 595 case MAINTENANCE_OUT: 596 switch (cdb[1]) { 597 case MO_SET_TARGET_PGS: 598 return 0; 599 default: 600 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 601 return 1; 602 } 603 case REQUEST_SENSE: 604 case PERSISTENT_RESERVE_IN: 605 case PERSISTENT_RESERVE_OUT: 606 case READ_BUFFER: 607 case WRITE_BUFFER: 608 return 0; 609 default: 610 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 611 return 1; 612 } 613 614 return 0; 615} 616 617static inline int core_alua_state_unavailable( 618 struct se_cmd *cmd, 619 unsigned char *cdb) 620{ 621 /* 622 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 623 * spc4r17 section 5.9.2.4.5 624 */ 625 switch (cdb[0]) { 626 case INQUIRY: 627 case REPORT_LUNS: 628 return 0; 629 case MAINTENANCE_IN: 630 switch (cdb[1] & 0x1f) { 631 case MI_REPORT_TARGET_PGS: 632 return 0; 633 default: 634 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 635 return 1; 636 } 637 case MAINTENANCE_OUT: 638 switch (cdb[1]) { 639 case MO_SET_TARGET_PGS: 640 return 0; 641 default: 642 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 643 return 1; 644 } 645 case REQUEST_SENSE: 646 case READ_BUFFER: 647 case WRITE_BUFFER: 648 return 0; 649 default: 650 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 651 return 1; 652 } 653 654 return 0; 655} 656 657static inline int core_alua_state_transition( 658 struct se_cmd *cmd, 659 unsigned char *cdb) 660{ 661 /* 662 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 663 * spc4r17 section 5.9.2.5 664 */ 665 switch (cdb[0]) { 666 case INQUIRY: 667 case REPORT_LUNS: 668 return 0; 669 case MAINTENANCE_IN: 670 switch (cdb[1] & 0x1f) { 671 case MI_REPORT_TARGET_PGS: 672 return 0; 673 default: 674 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 675 return 1; 676 } 677 case REQUEST_SENSE: 678 case READ_BUFFER: 679 case WRITE_BUFFER: 680 return 0; 681 default: 682 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 683 return 1; 684 } 685 686 return 0; 687} 688 689/* 690 * return 1: Is used to signal LUN not accessible, and check condition/not ready 691 * return 0: Used to signal success 692 * return -1: Used to signal failure, and invalid cdb field 693 */ 694sense_reason_t 695target_alua_state_check(struct se_cmd *cmd) 696{ 697 struct se_device *dev = cmd->se_dev; 698 unsigned char *cdb = cmd->t_task_cdb; 699 struct se_lun *lun = cmd->se_lun; 700 struct se_port *port = lun->lun_sep; 701 struct t10_alua_tg_pt_gp *tg_pt_gp; 702 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 703 int out_alua_state, nonop_delay_msecs; 704 705 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 706 return 0; 707 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 708 return 0; 709 710 if (!port) 711 return 0; 712 /* 713 * First, check for a struct se_port specific secondary ALUA target port 714 * access state: OFFLINE 715 */ 716 if (atomic_read(&port->sep_tg_pt_secondary_offline)) { 717 pr_debug("ALUA: Got secondary offline status for local" 718 " target port\n"); 719 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE); 720 return TCM_CHECK_CONDITION_NOT_READY; 721 } 722 /* 723 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the 724 * ALUA target port group, to obtain current ALUA access state. 725 * Otherwise look for the underlying struct se_device association with 726 * a ALUA logical unit group. 727 */ 728 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 729 if (!tg_pt_gp_mem) 730 return 0; 731 732 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 733 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 734 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 735 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 736 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 737 /* 738 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 739 * statement so the compiler knows explicitly to check this case first. 740 * For the Optimized ALUA access state case, we want to process the 741 * incoming fabric cmd ASAP.. 742 */ 743 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 744 return 0; 745 746 switch (out_alua_state) { 747 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 748 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 749 break; 750 case ALUA_ACCESS_STATE_STANDBY: 751 if (core_alua_state_standby(cmd, cdb)) 752 return TCM_CHECK_CONDITION_NOT_READY; 753 break; 754 case ALUA_ACCESS_STATE_UNAVAILABLE: 755 if (core_alua_state_unavailable(cmd, cdb)) 756 return TCM_CHECK_CONDITION_NOT_READY; 757 break; 758 case ALUA_ACCESS_STATE_TRANSITION: 759 if (core_alua_state_transition(cmd, cdb)) 760 return TCM_CHECK_CONDITION_NOT_READY; 761 break; 762 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 763 if (core_alua_state_lba_dependent(cmd, tg_pt_gp)) 764 return TCM_CHECK_CONDITION_NOT_READY; 765 break; 766 /* 767 * OFFLINE is a secondary ALUA target port group access state, that is 768 * handled above with struct se_port->sep_tg_pt_secondary_offline=1 769 */ 770 case ALUA_ACCESS_STATE_OFFLINE: 771 default: 772 pr_err("Unknown ALUA access state: 0x%02x\n", 773 out_alua_state); 774 return TCM_INVALID_CDB_FIELD; 775 } 776 777 return 0; 778} 779 780/* 781 * Check implicit and explicit ALUA state change request. 782 */ 783static sense_reason_t 784core_alua_check_transition(int state, int valid, int *primary) 785{ 786 /* 787 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 788 * defined as primary target port asymmetric access states. 789 */ 790 switch (state) { 791 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 792 if (!(valid & ALUA_AO_SUP)) 793 goto not_supported; 794 *primary = 1; 795 break; 796 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 797 if (!(valid & ALUA_AN_SUP)) 798 goto not_supported; 799 *primary = 1; 800 break; 801 case ALUA_ACCESS_STATE_STANDBY: 802 if (!(valid & ALUA_S_SUP)) 803 goto not_supported; 804 *primary = 1; 805 break; 806 case ALUA_ACCESS_STATE_UNAVAILABLE: 807 if (!(valid & ALUA_U_SUP)) 808 goto not_supported; 809 *primary = 1; 810 break; 811 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 812 if (!(valid & ALUA_LBD_SUP)) 813 goto not_supported; 814 *primary = 1; 815 break; 816 case ALUA_ACCESS_STATE_OFFLINE: 817 /* 818 * OFFLINE state is defined as a secondary target port 819 * asymmetric access state. 820 */ 821 if (!(valid & ALUA_O_SUP)) 822 goto not_supported; 823 *primary = 0; 824 break; 825 case ALUA_ACCESS_STATE_TRANSITION: 826 /* 827 * Transitioning is set internally, and 828 * cannot be selected manually. 829 */ 830 goto not_supported; 831 default: 832 pr_err("Unknown ALUA access state: 0x%02x\n", state); 833 return TCM_INVALID_PARAMETER_LIST; 834 } 835 836 return 0; 837 838not_supported: 839 pr_err("ALUA access state %s not supported", 840 core_alua_dump_state(state)); 841 return TCM_INVALID_PARAMETER_LIST; 842} 843 844static char *core_alua_dump_state(int state) 845{ 846 switch (state) { 847 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 848 return "Active/Optimized"; 849 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 850 return "Active/NonOptimized"; 851 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 852 return "LBA Dependent"; 853 case ALUA_ACCESS_STATE_STANDBY: 854 return "Standby"; 855 case ALUA_ACCESS_STATE_UNAVAILABLE: 856 return "Unavailable"; 857 case ALUA_ACCESS_STATE_OFFLINE: 858 return "Offline"; 859 case ALUA_ACCESS_STATE_TRANSITION: 860 return "Transitioning"; 861 default: 862 return "Unknown"; 863 } 864 865 return NULL; 866} 867 868char *core_alua_dump_status(int status) 869{ 870 switch (status) { 871 case ALUA_STATUS_NONE: 872 return "None"; 873 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 874 return "Altered by Explicit STPG"; 875 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 876 return "Altered by Implicit ALUA"; 877 default: 878 return "Unknown"; 879 } 880 881 return NULL; 882} 883 884/* 885 * Used by fabric modules to determine when we need to delay processing 886 * for the Active/NonOptimized paths.. 887 */ 888int core_alua_check_nonop_delay( 889 struct se_cmd *cmd) 890{ 891 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 892 return 0; 893 if (in_interrupt()) 894 return 0; 895 /* 896 * The ALUA Active/NonOptimized access state delay can be disabled 897 * in via configfs with a value of zero 898 */ 899 if (!cmd->alua_nonop_delay) 900 return 0; 901 /* 902 * struct se_cmd->alua_nonop_delay gets set by a target port group 903 * defined interval in core_alua_state_nonoptimized() 904 */ 905 msleep_interruptible(cmd->alua_nonop_delay); 906 return 0; 907} 908EXPORT_SYMBOL(core_alua_check_nonop_delay); 909 910/* 911 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex 912 * 913 */ 914static int core_alua_write_tpg_metadata( 915 const char *path, 916 unsigned char *md_buf, 917 u32 md_buf_len) 918{ 919 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 920 int ret; 921 922 if (IS_ERR(file)) { 923 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 924 return -ENODEV; 925 } 926 ret = kernel_write(file, md_buf, md_buf_len, 0); 927 if (ret < 0) 928 pr_err("Error writing ALUA metadata file: %s\n", path); 929 fput(file); 930 return (ret < 0) ? -EIO : 0; 931} 932 933/* 934 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 935 */ 936static int core_alua_update_tpg_primary_metadata( 937 struct t10_alua_tg_pt_gp *tg_pt_gp) 938{ 939 unsigned char *md_buf; 940 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 941 char path[ALUA_METADATA_PATH_LEN]; 942 int len, rc; 943 944 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 945 if (!md_buf) { 946 pr_err("Unable to allocate buf for ALUA metadata\n"); 947 return -ENOMEM; 948 } 949 950 memset(path, 0, ALUA_METADATA_PATH_LEN); 951 952 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 953 "tg_pt_gp_id=%hu\n" 954 "alua_access_state=0x%02x\n" 955 "alua_access_status=0x%02x\n", 956 tg_pt_gp->tg_pt_gp_id, 957 tg_pt_gp->tg_pt_gp_alua_pending_state, 958 tg_pt_gp->tg_pt_gp_alua_access_status); 959 960 snprintf(path, ALUA_METADATA_PATH_LEN, 961 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], 962 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 963 964 rc = core_alua_write_tpg_metadata(path, md_buf, len); 965 kfree(md_buf); 966 return rc; 967} 968 969static void core_alua_do_transition_tg_pt_work(struct work_struct *work) 970{ 971 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, 972 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work); 973 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 974 struct se_dev_entry *se_deve; 975 struct se_lun_acl *lacl; 976 struct se_port *port; 977 struct t10_alua_tg_pt_gp_member *mem; 978 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == 979 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); 980 981 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 982 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, 983 tg_pt_gp_mem_list) { 984 port = mem->tg_pt; 985 /* 986 * After an implicit target port asymmetric access state 987 * change, a device server shall establish a unit attention 988 * condition for the initiator port associated with every I_T 989 * nexus with the additional sense code set to ASYMMETRIC 990 * ACCESS STATE CHANGED. 991 * 992 * After an explicit target port asymmetric access state 993 * change, a device server shall establish a unit attention 994 * condition with the additional sense code set to ASYMMETRIC 995 * ACCESS STATE CHANGED for the initiator port associated with 996 * every I_T nexus other than the I_T nexus on which the SET 997 * TARGET PORT GROUPS command 998 */ 999 atomic_inc_mb(&mem->tg_pt_gp_mem_ref_cnt); 1000 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1001 1002 spin_lock_bh(&port->sep_alua_lock); 1003 list_for_each_entry(se_deve, &port->sep_alua_list, 1004 alua_port_list) { 1005 lacl = se_deve->se_lun_acl; 1006 /* 1007 * se_deve->se_lun_acl pointer may be NULL for a 1008 * entry created without explicit Node+MappedLUN ACLs 1009 */ 1010 if (!lacl) 1011 continue; 1012 1013 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 1014 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 1015 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 1016 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) && 1017 (tg_pt_gp->tg_pt_gp_alua_port != NULL) && 1018 (tg_pt_gp->tg_pt_gp_alua_port == port)) 1019 continue; 1020 1021 core_scsi3_ua_allocate(lacl->se_lun_nacl, 1022 se_deve->mapped_lun, 0x2A, 1023 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1024 } 1025 spin_unlock_bh(&port->sep_alua_lock); 1026 1027 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1028 atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt); 1029 } 1030 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1031 /* 1032 * Update the ALUA metadata buf that has been allocated in 1033 * core_alua_do_port_transition(), this metadata will be written 1034 * to struct file. 1035 * 1036 * Note that there is the case where we do not want to update the 1037 * metadata when the saved metadata is being parsed in userspace 1038 * when setting the existing port access state and access status. 1039 * 1040 * Also note that the failure to write out the ALUA metadata to 1041 * struct file does NOT affect the actual ALUA transition. 1042 */ 1043 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1044 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1045 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1046 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1047 } 1048 /* 1049 * Set the current primary ALUA access state to the requested new state 1050 */ 1051 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1052 tg_pt_gp->tg_pt_gp_alua_pending_state); 1053 1054 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1055 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1056 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1057 tg_pt_gp->tg_pt_gp_id, 1058 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1059 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1060 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1061 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1062 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1063 1064 if (tg_pt_gp->tg_pt_gp_transition_complete) 1065 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1066} 1067 1068static int core_alua_do_transition_tg_pt( 1069 struct t10_alua_tg_pt_gp *tg_pt_gp, 1070 int new_state, 1071 int explicit) 1072{ 1073 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1074 DECLARE_COMPLETION_ONSTACK(wait); 1075 1076 /* Nothing to be done here */ 1077 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1078 return 0; 1079 1080 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1081 return -EAGAIN; 1082 1083 /* 1084 * Flush any pending transitions 1085 */ 1086 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && 1087 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1088 ALUA_ACCESS_STATE_TRANSITION) { 1089 /* Just in case */ 1090 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1091 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1092 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1093 wait_for_completion(&wait); 1094 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1095 return 0; 1096 } 1097 1098 /* 1099 * Save the old primary ALUA access state, and set the current state 1100 * to ALUA_ACCESS_STATE_TRANSITION. 1101 */ 1102 tg_pt_gp->tg_pt_gp_alua_previous_state = 1103 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1104 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1105 1106 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1107 ALUA_ACCESS_STATE_TRANSITION); 1108 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1109 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1110 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1111 1112 /* 1113 * Check for the optional ALUA primary state transition delay 1114 */ 1115 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1116 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1117 1118 /* 1119 * Take a reference for workqueue item 1120 */ 1121 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1122 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1123 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1124 1125 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { 1126 unsigned long transition_tmo; 1127 1128 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; 1129 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1130 &tg_pt_gp->tg_pt_gp_transition_work, 1131 transition_tmo); 1132 } else { 1133 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1134 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1135 &tg_pt_gp->tg_pt_gp_transition_work, 0); 1136 wait_for_completion(&wait); 1137 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1138 } 1139 1140 return 0; 1141} 1142 1143int core_alua_do_port_transition( 1144 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1145 struct se_device *l_dev, 1146 struct se_port *l_port, 1147 struct se_node_acl *l_nacl, 1148 int new_state, 1149 int explicit) 1150{ 1151 struct se_device *dev; 1152 struct t10_alua_lu_gp *lu_gp; 1153 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1154 struct t10_alua_tg_pt_gp *tg_pt_gp; 1155 int primary, valid_states, rc = 0; 1156 1157 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1158 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1159 return -EINVAL; 1160 1161 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1162 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1163 lu_gp = local_lu_gp_mem->lu_gp; 1164 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1165 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1166 /* 1167 * For storage objects that are members of the 'default_lu_gp', 1168 * we only do transition on the passed *l_tp_pt_gp, and not 1169 * on all of the matching target port groups IDs in default_lu_gp. 1170 */ 1171 if (!lu_gp->lu_gp_id) { 1172 /* 1173 * core_alua_do_transition_tg_pt() will always return 1174 * success. 1175 */ 1176 l_tg_pt_gp->tg_pt_gp_alua_port = l_port; 1177 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1178 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1179 new_state, explicit); 1180 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1181 return rc; 1182 } 1183 /* 1184 * For all other LU groups aside from 'default_lu_gp', walk all of 1185 * the associated storage objects looking for a matching target port 1186 * group ID from the local target port group. 1187 */ 1188 spin_lock(&lu_gp->lu_gp_lock); 1189 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1190 lu_gp_mem_list) { 1191 1192 dev = lu_gp_mem->lu_gp_mem_dev; 1193 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1194 spin_unlock(&lu_gp->lu_gp_lock); 1195 1196 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1197 list_for_each_entry(tg_pt_gp, 1198 &dev->t10_alua.tg_pt_gps_list, 1199 tg_pt_gp_list) { 1200 1201 if (!tg_pt_gp->tg_pt_gp_valid_id) 1202 continue; 1203 /* 1204 * If the target behavior port asymmetric access state 1205 * is changed for any target port group accessible via 1206 * a logical unit within a LU group, the target port 1207 * behavior group asymmetric access states for the same 1208 * target port group accessible via other logical units 1209 * in that LU group will also change. 1210 */ 1211 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1212 continue; 1213 1214 if (l_tg_pt_gp == tg_pt_gp) { 1215 tg_pt_gp->tg_pt_gp_alua_port = l_port; 1216 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1217 } else { 1218 tg_pt_gp->tg_pt_gp_alua_port = NULL; 1219 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1220 } 1221 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1222 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1223 /* 1224 * core_alua_do_transition_tg_pt() will always return 1225 * success. 1226 */ 1227 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1228 new_state, explicit); 1229 1230 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1231 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1232 if (rc) 1233 break; 1234 } 1235 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1236 1237 spin_lock(&lu_gp->lu_gp_lock); 1238 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1239 } 1240 spin_unlock(&lu_gp->lu_gp_lock); 1241 1242 if (!rc) { 1243 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1244 " Group IDs: %hu %s transition to primary state: %s\n", 1245 config_item_name(&lu_gp->lu_gp_group.cg_item), 1246 l_tg_pt_gp->tg_pt_gp_id, 1247 (explicit) ? "explicit" : "implicit", 1248 core_alua_dump_state(new_state)); 1249 } 1250 1251 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1252 return rc; 1253} 1254 1255/* 1256 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held 1257 */ 1258static int core_alua_update_tpg_secondary_metadata( 1259 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1260 struct se_port *port) 1261{ 1262 unsigned char *md_buf; 1263 struct se_portal_group *se_tpg = port->sep_tpg; 1264 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1265 int len, rc; 1266 1267 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1268 if (!md_buf) { 1269 pr_err("Unable to allocate buf for ALUA metadata\n"); 1270 return -ENOMEM; 1271 } 1272 1273 memset(path, 0, ALUA_METADATA_PATH_LEN); 1274 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1275 1276 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1277 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1278 1279 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1280 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1281 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1282 1283 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1284 "alua_tg_pt_status=0x%02x\n", 1285 atomic_read(&port->sep_tg_pt_secondary_offline), 1286 port->sep_tg_pt_secondary_stat); 1287 1288 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", 1289 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1290 port->sep_lun->unpacked_lun); 1291 1292 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1293 kfree(md_buf); 1294 1295 return rc; 1296} 1297 1298static int core_alua_set_tg_pt_secondary_state( 1299 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1300 struct se_port *port, 1301 int explicit, 1302 int offline) 1303{ 1304 struct t10_alua_tg_pt_gp *tg_pt_gp; 1305 int trans_delay_msecs; 1306 1307 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1308 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1309 if (!tg_pt_gp) { 1310 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1311 pr_err("Unable to complete secondary state" 1312 " transition\n"); 1313 return -EINVAL; 1314 } 1315 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1316 /* 1317 * Set the secondary ALUA target port access state to OFFLINE 1318 * or release the previously secondary state for struct se_port 1319 */ 1320 if (offline) 1321 atomic_set(&port->sep_tg_pt_secondary_offline, 1); 1322 else 1323 atomic_set(&port->sep_tg_pt_secondary_offline, 0); 1324 1325 port->sep_tg_pt_secondary_stat = (explicit) ? 1326 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1327 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1328 1329 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1330 " to secondary access state: %s\n", (explicit) ? "explicit" : 1331 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1332 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1333 1334 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1335 /* 1336 * Do the optional transition delay after we set the secondary 1337 * ALUA access state. 1338 */ 1339 if (trans_delay_msecs != 0) 1340 msleep_interruptible(trans_delay_msecs); 1341 /* 1342 * See if we need to update the ALUA fabric port metadata for 1343 * secondary state and status 1344 */ 1345 if (port->sep_tg_pt_secondary_write_md) { 1346 mutex_lock(&port->sep_tg_pt_md_mutex); 1347 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port); 1348 mutex_unlock(&port->sep_tg_pt_md_mutex); 1349 } 1350 1351 return 0; 1352} 1353 1354struct t10_alua_lba_map * 1355core_alua_allocate_lba_map(struct list_head *list, 1356 u64 first_lba, u64 last_lba) 1357{ 1358 struct t10_alua_lba_map *lba_map; 1359 1360 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1361 if (!lba_map) { 1362 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1363 return ERR_PTR(-ENOMEM); 1364 } 1365 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1366 lba_map->lba_map_first_lba = first_lba; 1367 lba_map->lba_map_last_lba = last_lba; 1368 1369 list_add_tail(&lba_map->lba_map_list, list); 1370 return lba_map; 1371} 1372 1373int 1374core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1375 int pg_id, int state) 1376{ 1377 struct t10_alua_lba_map_member *lba_map_mem; 1378 1379 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1380 lba_map_mem_list) { 1381 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1382 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1383 return -EINVAL; 1384 } 1385 } 1386 1387 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1388 if (!lba_map_mem) { 1389 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1390 return -ENOMEM; 1391 } 1392 lba_map_mem->lba_map_mem_alua_state = state; 1393 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1394 1395 list_add_tail(&lba_map_mem->lba_map_mem_list, 1396 &lba_map->lba_map_mem_list); 1397 return 0; 1398} 1399 1400void 1401core_alua_free_lba_map(struct list_head *lba_list) 1402{ 1403 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1404 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1405 1406 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1407 lba_map_list) { 1408 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1409 &lba_map->lba_map_mem_list, 1410 lba_map_mem_list) { 1411 list_del(&lba_map_mem->lba_map_mem_list); 1412 kmem_cache_free(t10_alua_lba_map_mem_cache, 1413 lba_map_mem); 1414 } 1415 list_del(&lba_map->lba_map_list); 1416 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1417 } 1418} 1419 1420void 1421core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1422 int segment_size, int segment_mult) 1423{ 1424 struct list_head old_lba_map_list; 1425 struct t10_alua_tg_pt_gp *tg_pt_gp; 1426 int activate = 0, supported; 1427 1428 INIT_LIST_HEAD(&old_lba_map_list); 1429 spin_lock(&dev->t10_alua.lba_map_lock); 1430 dev->t10_alua.lba_map_segment_size = segment_size; 1431 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1432 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1433 if (lba_map_list) { 1434 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1435 activate = 1; 1436 } 1437 spin_unlock(&dev->t10_alua.lba_map_lock); 1438 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1439 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1440 tg_pt_gp_list) { 1441 1442 if (!tg_pt_gp->tg_pt_gp_valid_id) 1443 continue; 1444 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1445 if (activate) 1446 supported |= ALUA_LBD_SUP; 1447 else 1448 supported &= ~ALUA_LBD_SUP; 1449 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1450 } 1451 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1452 core_alua_free_lba_map(&old_lba_map_list); 1453} 1454 1455struct t10_alua_lu_gp * 1456core_alua_allocate_lu_gp(const char *name, int def_group) 1457{ 1458 struct t10_alua_lu_gp *lu_gp; 1459 1460 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1461 if (!lu_gp) { 1462 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1463 return ERR_PTR(-ENOMEM); 1464 } 1465 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1466 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1467 spin_lock_init(&lu_gp->lu_gp_lock); 1468 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1469 1470 if (def_group) { 1471 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1472 lu_gp->lu_gp_valid_id = 1; 1473 alua_lu_gps_count++; 1474 } 1475 1476 return lu_gp; 1477} 1478 1479int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1480{ 1481 struct t10_alua_lu_gp *lu_gp_tmp; 1482 u16 lu_gp_id_tmp; 1483 /* 1484 * The lu_gp->lu_gp_id may only be set once.. 1485 */ 1486 if (lu_gp->lu_gp_valid_id) { 1487 pr_warn("ALUA LU Group already has a valid ID," 1488 " ignoring request\n"); 1489 return -EINVAL; 1490 } 1491 1492 spin_lock(&lu_gps_lock); 1493 if (alua_lu_gps_count == 0x0000ffff) { 1494 pr_err("Maximum ALUA alua_lu_gps_count:" 1495 " 0x0000ffff reached\n"); 1496 spin_unlock(&lu_gps_lock); 1497 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1498 return -ENOSPC; 1499 } 1500again: 1501 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1502 alua_lu_gps_counter++; 1503 1504 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1505 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1506 if (!lu_gp_id) 1507 goto again; 1508 1509 pr_warn("ALUA Logical Unit Group ID: %hu" 1510 " already exists, ignoring request\n", 1511 lu_gp_id); 1512 spin_unlock(&lu_gps_lock); 1513 return -EINVAL; 1514 } 1515 } 1516 1517 lu_gp->lu_gp_id = lu_gp_id_tmp; 1518 lu_gp->lu_gp_valid_id = 1; 1519 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1520 alua_lu_gps_count++; 1521 spin_unlock(&lu_gps_lock); 1522 1523 return 0; 1524} 1525 1526static struct t10_alua_lu_gp_member * 1527core_alua_allocate_lu_gp_mem(struct se_device *dev) 1528{ 1529 struct t10_alua_lu_gp_member *lu_gp_mem; 1530 1531 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1532 if (!lu_gp_mem) { 1533 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1534 return ERR_PTR(-ENOMEM); 1535 } 1536 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1537 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1538 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1539 1540 lu_gp_mem->lu_gp_mem_dev = dev; 1541 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1542 1543 return lu_gp_mem; 1544} 1545 1546void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1547{ 1548 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1549 /* 1550 * Once we have reached this point, config_item_put() has 1551 * already been called from target_core_alua_drop_lu_gp(). 1552 * 1553 * Here, we remove the *lu_gp from the global list so that 1554 * no associations can be made while we are releasing 1555 * struct t10_alua_lu_gp. 1556 */ 1557 spin_lock(&lu_gps_lock); 1558 list_del(&lu_gp->lu_gp_node); 1559 alua_lu_gps_count--; 1560 spin_unlock(&lu_gps_lock); 1561 /* 1562 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1563 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1564 * released with core_alua_put_lu_gp_from_name() 1565 */ 1566 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1567 cpu_relax(); 1568 /* 1569 * Release reference to struct t10_alua_lu_gp * from all associated 1570 * struct se_device. 1571 */ 1572 spin_lock(&lu_gp->lu_gp_lock); 1573 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1574 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1575 if (lu_gp_mem->lu_gp_assoc) { 1576 list_del(&lu_gp_mem->lu_gp_mem_list); 1577 lu_gp->lu_gp_members--; 1578 lu_gp_mem->lu_gp_assoc = 0; 1579 } 1580 spin_unlock(&lu_gp->lu_gp_lock); 1581 /* 1582 * 1583 * lu_gp_mem is associated with a single 1584 * struct se_device->dev_alua_lu_gp_mem, and is released when 1585 * struct se_device is released via core_alua_free_lu_gp_mem(). 1586 * 1587 * If the passed lu_gp does NOT match the default_lu_gp, assume 1588 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1589 */ 1590 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1591 if (lu_gp != default_lu_gp) 1592 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1593 default_lu_gp); 1594 else 1595 lu_gp_mem->lu_gp = NULL; 1596 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1597 1598 spin_lock(&lu_gp->lu_gp_lock); 1599 } 1600 spin_unlock(&lu_gp->lu_gp_lock); 1601 1602 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1603} 1604 1605void core_alua_free_lu_gp_mem(struct se_device *dev) 1606{ 1607 struct t10_alua_lu_gp *lu_gp; 1608 struct t10_alua_lu_gp_member *lu_gp_mem; 1609 1610 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1611 if (!lu_gp_mem) 1612 return; 1613 1614 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1615 cpu_relax(); 1616 1617 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1618 lu_gp = lu_gp_mem->lu_gp; 1619 if (lu_gp) { 1620 spin_lock(&lu_gp->lu_gp_lock); 1621 if (lu_gp_mem->lu_gp_assoc) { 1622 list_del(&lu_gp_mem->lu_gp_mem_list); 1623 lu_gp->lu_gp_members--; 1624 lu_gp_mem->lu_gp_assoc = 0; 1625 } 1626 spin_unlock(&lu_gp->lu_gp_lock); 1627 lu_gp_mem->lu_gp = NULL; 1628 } 1629 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1630 1631 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1632} 1633 1634struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1635{ 1636 struct t10_alua_lu_gp *lu_gp; 1637 struct config_item *ci; 1638 1639 spin_lock(&lu_gps_lock); 1640 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1641 if (!lu_gp->lu_gp_valid_id) 1642 continue; 1643 ci = &lu_gp->lu_gp_group.cg_item; 1644 if (!strcmp(config_item_name(ci), name)) { 1645 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1646 spin_unlock(&lu_gps_lock); 1647 return lu_gp; 1648 } 1649 } 1650 spin_unlock(&lu_gps_lock); 1651 1652 return NULL; 1653} 1654 1655void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1656{ 1657 spin_lock(&lu_gps_lock); 1658 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1659 spin_unlock(&lu_gps_lock); 1660} 1661 1662/* 1663 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1664 */ 1665void __core_alua_attach_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 lu_gp_mem->lu_gp = lu_gp; 1671 lu_gp_mem->lu_gp_assoc = 1; 1672 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1673 lu_gp->lu_gp_members++; 1674 spin_unlock(&lu_gp->lu_gp_lock); 1675} 1676 1677/* 1678 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1679 */ 1680void __core_alua_drop_lu_gp_mem( 1681 struct t10_alua_lu_gp_member *lu_gp_mem, 1682 struct t10_alua_lu_gp *lu_gp) 1683{ 1684 spin_lock(&lu_gp->lu_gp_lock); 1685 list_del(&lu_gp_mem->lu_gp_mem_list); 1686 lu_gp_mem->lu_gp = NULL; 1687 lu_gp_mem->lu_gp_assoc = 0; 1688 lu_gp->lu_gp_members--; 1689 spin_unlock(&lu_gp->lu_gp_lock); 1690} 1691 1692struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1693 const char *name, int def_group) 1694{ 1695 struct t10_alua_tg_pt_gp *tg_pt_gp; 1696 1697 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1698 if (!tg_pt_gp) { 1699 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1700 return NULL; 1701 } 1702 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1703 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); 1704 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1705 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1706 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1707 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1708 core_alua_do_transition_tg_pt_work); 1709 tg_pt_gp->tg_pt_gp_dev = dev; 1710 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1711 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1712 /* 1713 * Enable both explicit and implicit ALUA support by default 1714 */ 1715 tg_pt_gp->tg_pt_gp_alua_access_type = 1716 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1717 /* 1718 * Set the default Active/NonOptimized Delay in milliseconds 1719 */ 1720 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1721 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1722 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1723 1724 /* 1725 * Enable all supported states 1726 */ 1727 tg_pt_gp->tg_pt_gp_alua_supported_states = 1728 ALUA_T_SUP | ALUA_O_SUP | 1729 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1730 1731 if (def_group) { 1732 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1733 tg_pt_gp->tg_pt_gp_id = 1734 dev->t10_alua.alua_tg_pt_gps_counter++; 1735 tg_pt_gp->tg_pt_gp_valid_id = 1; 1736 dev->t10_alua.alua_tg_pt_gps_count++; 1737 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1738 &dev->t10_alua.tg_pt_gps_list); 1739 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1740 } 1741 1742 return tg_pt_gp; 1743} 1744 1745int core_alua_set_tg_pt_gp_id( 1746 struct t10_alua_tg_pt_gp *tg_pt_gp, 1747 u16 tg_pt_gp_id) 1748{ 1749 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1750 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1751 u16 tg_pt_gp_id_tmp; 1752 1753 /* 1754 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1755 */ 1756 if (tg_pt_gp->tg_pt_gp_valid_id) { 1757 pr_warn("ALUA TG PT Group already has a valid ID," 1758 " ignoring request\n"); 1759 return -EINVAL; 1760 } 1761 1762 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1763 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1764 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1765 " 0x0000ffff reached\n"); 1766 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1767 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1768 return -ENOSPC; 1769 } 1770again: 1771 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1772 dev->t10_alua.alua_tg_pt_gps_counter++; 1773 1774 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1775 tg_pt_gp_list) { 1776 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1777 if (!tg_pt_gp_id) 1778 goto again; 1779 1780 pr_err("ALUA Target Port Group ID: %hu already" 1781 " exists, ignoring request\n", tg_pt_gp_id); 1782 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1783 return -EINVAL; 1784 } 1785 } 1786 1787 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1788 tg_pt_gp->tg_pt_gp_valid_id = 1; 1789 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1790 &dev->t10_alua.tg_pt_gps_list); 1791 dev->t10_alua.alua_tg_pt_gps_count++; 1792 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1793 1794 return 0; 1795} 1796 1797struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( 1798 struct se_port *port) 1799{ 1800 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1801 1802 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, 1803 GFP_KERNEL); 1804 if (!tg_pt_gp_mem) { 1805 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); 1806 return ERR_PTR(-ENOMEM); 1807 } 1808 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1809 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1810 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); 1811 1812 tg_pt_gp_mem->tg_pt = port; 1813 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; 1814 1815 return tg_pt_gp_mem; 1816} 1817 1818void core_alua_free_tg_pt_gp( 1819 struct t10_alua_tg_pt_gp *tg_pt_gp) 1820{ 1821 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1822 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; 1823 1824 /* 1825 * Once we have reached this point, config_item_put() has already 1826 * been called from target_core_alua_drop_tg_pt_gp(). 1827 * 1828 * Here we remove *tg_pt_gp from the global list so that 1829 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1830 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1831 */ 1832 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1833 list_del(&tg_pt_gp->tg_pt_gp_list); 1834 dev->t10_alua.alua_tg_pt_gps_counter--; 1835 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1836 1837 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1838 1839 /* 1840 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1841 * core_alua_get_tg_pt_gp_by_name() in 1842 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1843 * to be released with core_alua_put_tg_pt_gp_from_name(). 1844 */ 1845 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1846 cpu_relax(); 1847 1848 /* 1849 * Release reference to struct t10_alua_tg_pt_gp from all associated 1850 * struct se_port. 1851 */ 1852 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1853 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, 1854 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { 1855 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1856 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1857 tg_pt_gp->tg_pt_gp_members--; 1858 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1859 } 1860 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1861 /* 1862 * tg_pt_gp_mem is associated with a single 1863 * se_port->sep_alua_tg_pt_gp_mem, and is released via 1864 * core_alua_free_tg_pt_gp_mem(). 1865 * 1866 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1867 * assume we want to re-associate a given tg_pt_gp_mem with 1868 * default_tg_pt_gp. 1869 */ 1870 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1871 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1872 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1873 dev->t10_alua.default_tg_pt_gp); 1874 } else 1875 tg_pt_gp_mem->tg_pt_gp = NULL; 1876 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1877 1878 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1879 } 1880 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1881 1882 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1883} 1884 1885void core_alua_free_tg_pt_gp_mem(struct se_port *port) 1886{ 1887 struct t10_alua_tg_pt_gp *tg_pt_gp; 1888 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1889 1890 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1891 if (!tg_pt_gp_mem) 1892 return; 1893 1894 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) 1895 cpu_relax(); 1896 1897 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1898 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1899 if (tg_pt_gp) { 1900 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1901 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1902 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1903 tg_pt_gp->tg_pt_gp_members--; 1904 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1905 } 1906 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1907 tg_pt_gp_mem->tg_pt_gp = NULL; 1908 } 1909 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1910 1911 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); 1912} 1913 1914static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1915 struct se_device *dev, const char *name) 1916{ 1917 struct t10_alua_tg_pt_gp *tg_pt_gp; 1918 struct config_item *ci; 1919 1920 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1921 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1922 tg_pt_gp_list) { 1923 if (!tg_pt_gp->tg_pt_gp_valid_id) 1924 continue; 1925 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1926 if (!strcmp(config_item_name(ci), name)) { 1927 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1928 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1929 return tg_pt_gp; 1930 } 1931 } 1932 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1933 1934 return NULL; 1935} 1936 1937static void core_alua_put_tg_pt_gp_from_name( 1938 struct t10_alua_tg_pt_gp *tg_pt_gp) 1939{ 1940 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1941 1942 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1943 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1944 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1945} 1946 1947/* 1948 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1949 */ 1950void __core_alua_attach_tg_pt_gp_mem( 1951 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1952 struct t10_alua_tg_pt_gp *tg_pt_gp) 1953{ 1954 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1955 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; 1956 tg_pt_gp_mem->tg_pt_gp_assoc = 1; 1957 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, 1958 &tg_pt_gp->tg_pt_gp_mem_list); 1959 tg_pt_gp->tg_pt_gp_members++; 1960 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1961} 1962 1963/* 1964 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1965 */ 1966static void __core_alua_drop_tg_pt_gp_mem( 1967 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1968 struct t10_alua_tg_pt_gp *tg_pt_gp) 1969{ 1970 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1971 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1972 tg_pt_gp_mem->tg_pt_gp = NULL; 1973 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1974 tg_pt_gp->tg_pt_gp_members--; 1975 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1976} 1977 1978ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) 1979{ 1980 struct config_item *tg_pt_ci; 1981 struct t10_alua_tg_pt_gp *tg_pt_gp; 1982 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1983 ssize_t len = 0; 1984 1985 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1986 if (!tg_pt_gp_mem) 1987 return len; 1988 1989 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1990 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1991 if (tg_pt_gp) { 1992 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1993 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1994 " %hu\nTG Port Primary Access State: %s\nTG Port " 1995 "Primary Access Status: %s\nTG Port Secondary Access" 1996 " State: %s\nTG Port Secondary Access Status: %s\n", 1997 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1998 core_alua_dump_state(atomic_read( 1999 &tg_pt_gp->tg_pt_gp_alua_access_state)), 2000 core_alua_dump_status( 2001 tg_pt_gp->tg_pt_gp_alua_access_status), 2002 (atomic_read(&port->sep_tg_pt_secondary_offline)) ? 2003 "Offline" : "None", 2004 core_alua_dump_status(port->sep_tg_pt_secondary_stat)); 2005 } 2006 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2007 2008 return len; 2009} 2010 2011ssize_t core_alua_store_tg_pt_gp_info( 2012 struct se_port *port, 2013 const char *page, 2014 size_t count) 2015{ 2016 struct se_portal_group *tpg; 2017 struct se_lun *lun; 2018 struct se_device *dev = port->sep_lun->lun_se_dev; 2019 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 2020 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2021 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 2022 int move = 0; 2023 2024 tpg = port->sep_tpg; 2025 lun = port->sep_lun; 2026 2027 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 2028 if (!tg_pt_gp_mem) 2029 return 0; 2030 2031 if (count > TG_PT_GROUP_NAME_BUF) { 2032 pr_err("ALUA Target Port Group alias too large!\n"); 2033 return -EINVAL; 2034 } 2035 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 2036 memcpy(buf, page, count); 2037 /* 2038 * Any ALUA target port group alias besides "NULL" means we will be 2039 * making a new group association. 2040 */ 2041 if (strcmp(strstrip(buf), "NULL")) { 2042 /* 2043 * core_alua_get_tg_pt_gp_by_name() will increment reference to 2044 * struct t10_alua_tg_pt_gp. This reference is released with 2045 * core_alua_put_tg_pt_gp_from_name() below. 2046 */ 2047 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 2048 strstrip(buf)); 2049 if (!tg_pt_gp_new) 2050 return -ENODEV; 2051 } 2052 2053 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2054 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 2055 if (tg_pt_gp) { 2056 /* 2057 * Clearing an existing tg_pt_gp association, and replacing 2058 * with the default_tg_pt_gp. 2059 */ 2060 if (!tg_pt_gp_new) { 2061 pr_debug("Target_Core_ConfigFS: Moving" 2062 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2063 " alua/%s, ID: %hu back to" 2064 " default_tg_pt_gp\n", 2065 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2066 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2067 config_item_name(&lun->lun_group.cg_item), 2068 config_item_name( 2069 &tg_pt_gp->tg_pt_gp_group.cg_item), 2070 tg_pt_gp->tg_pt_gp_id); 2071 2072 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2073 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 2074 dev->t10_alua.default_tg_pt_gp); 2075 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2076 2077 return count; 2078 } 2079 /* 2080 * Removing existing association of tg_pt_gp_mem with tg_pt_gp 2081 */ 2082 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2083 move = 1; 2084 } 2085 /* 2086 * Associate tg_pt_gp_mem with tg_pt_gp_new. 2087 */ 2088 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); 2089 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2090 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2091 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2092 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2093 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2094 config_item_name(&lun->lun_group.cg_item), 2095 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2096 tg_pt_gp_new->tg_pt_gp_id); 2097 2098 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2099 return count; 2100} 2101 2102ssize_t core_alua_show_access_type( 2103 struct t10_alua_tg_pt_gp *tg_pt_gp, 2104 char *page) 2105{ 2106 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2107 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2108 return sprintf(page, "Implicit and Explicit\n"); 2109 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2110 return sprintf(page, "Implicit\n"); 2111 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2112 return sprintf(page, "Explicit\n"); 2113 else 2114 return sprintf(page, "None\n"); 2115} 2116 2117ssize_t core_alua_store_access_type( 2118 struct t10_alua_tg_pt_gp *tg_pt_gp, 2119 const char *page, 2120 size_t count) 2121{ 2122 unsigned long tmp; 2123 int ret; 2124 2125 ret = kstrtoul(page, 0, &tmp); 2126 if (ret < 0) { 2127 pr_err("Unable to extract alua_access_type\n"); 2128 return ret; 2129 } 2130 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2131 pr_err("Illegal value for alua_access_type:" 2132 " %lu\n", tmp); 2133 return -EINVAL; 2134 } 2135 if (tmp == 3) 2136 tg_pt_gp->tg_pt_gp_alua_access_type = 2137 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2138 else if (tmp == 2) 2139 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2140 else if (tmp == 1) 2141 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2142 else 2143 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2144 2145 return count; 2146} 2147 2148ssize_t core_alua_show_nonop_delay_msecs( 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_nonop_delay_msecs); 2153} 2154 2155ssize_t core_alua_store_nonop_delay_msecs( 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 nonop_delay_msecs\n"); 2166 return ret; 2167 } 2168 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2169 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2170 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2171 ALUA_MAX_NONOP_DELAY_MSECS); 2172 return -EINVAL; 2173 } 2174 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2175 2176 return count; 2177} 2178 2179ssize_t core_alua_show_trans_delay_msecs( 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_trans_delay_msecs); 2184} 2185 2186ssize_t core_alua_store_trans_delay_msecs( 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 trans_delay_msecs\n"); 2197 return ret; 2198 } 2199 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2200 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2201 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2202 ALUA_MAX_TRANS_DELAY_MSECS); 2203 return -EINVAL; 2204 } 2205 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2206 2207 return count; 2208} 2209 2210ssize_t core_alua_show_implicit_trans_secs( 2211 struct t10_alua_tg_pt_gp *tg_pt_gp, 2212 char *page) 2213{ 2214 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2215} 2216 2217ssize_t core_alua_store_implicit_trans_secs( 2218 struct t10_alua_tg_pt_gp *tg_pt_gp, 2219 const char *page, 2220 size_t count) 2221{ 2222 unsigned long tmp; 2223 int ret; 2224 2225 ret = kstrtoul(page, 0, &tmp); 2226 if (ret < 0) { 2227 pr_err("Unable to extract implicit_trans_secs\n"); 2228 return ret; 2229 } 2230 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2231 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2232 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2233 ALUA_MAX_IMPLICIT_TRANS_SECS); 2234 return -EINVAL; 2235 } 2236 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2237 2238 return count; 2239} 2240 2241ssize_t core_alua_show_preferred_bit( 2242 struct t10_alua_tg_pt_gp *tg_pt_gp, 2243 char *page) 2244{ 2245 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2246} 2247 2248ssize_t core_alua_store_preferred_bit( 2249 struct t10_alua_tg_pt_gp *tg_pt_gp, 2250 const char *page, 2251 size_t count) 2252{ 2253 unsigned long tmp; 2254 int ret; 2255 2256 ret = kstrtoul(page, 0, &tmp); 2257 if (ret < 0) { 2258 pr_err("Unable to extract preferred ALUA value\n"); 2259 return ret; 2260 } 2261 if ((tmp != 0) && (tmp != 1)) { 2262 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2263 return -EINVAL; 2264 } 2265 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2266 2267 return count; 2268} 2269 2270ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2271{ 2272 if (!lun->lun_sep) 2273 return -ENODEV; 2274 2275 return sprintf(page, "%d\n", 2276 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); 2277} 2278 2279ssize_t core_alua_store_offline_bit( 2280 struct se_lun *lun, 2281 const char *page, 2282 size_t count) 2283{ 2284 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2285 unsigned long tmp; 2286 int ret; 2287 2288 if (!lun->lun_sep) 2289 return -ENODEV; 2290 2291 ret = kstrtoul(page, 0, &tmp); 2292 if (ret < 0) { 2293 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2294 return ret; 2295 } 2296 if ((tmp != 0) && (tmp != 1)) { 2297 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2298 tmp); 2299 return -EINVAL; 2300 } 2301 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; 2302 if (!tg_pt_gp_mem) { 2303 pr_err("Unable to locate *tg_pt_gp_mem\n"); 2304 return -EINVAL; 2305 } 2306 2307 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, 2308 lun->lun_sep, 0, (int)tmp); 2309 if (ret < 0) 2310 return -EINVAL; 2311 2312 return count; 2313} 2314 2315ssize_t core_alua_show_secondary_status( 2316 struct se_lun *lun, 2317 char *page) 2318{ 2319 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); 2320} 2321 2322ssize_t core_alua_store_secondary_status( 2323 struct se_lun *lun, 2324 const char *page, 2325 size_t count) 2326{ 2327 unsigned long tmp; 2328 int ret; 2329 2330 ret = kstrtoul(page, 0, &tmp); 2331 if (ret < 0) { 2332 pr_err("Unable to extract alua_tg_pt_status\n"); 2333 return ret; 2334 } 2335 if ((tmp != ALUA_STATUS_NONE) && 2336 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2337 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2338 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2339 tmp); 2340 return -EINVAL; 2341 } 2342 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; 2343 2344 return count; 2345} 2346 2347ssize_t core_alua_show_secondary_write_metadata( 2348 struct se_lun *lun, 2349 char *page) 2350{ 2351 return sprintf(page, "%d\n", 2352 lun->lun_sep->sep_tg_pt_secondary_write_md); 2353} 2354 2355ssize_t core_alua_store_secondary_write_metadata( 2356 struct se_lun *lun, 2357 const char *page, 2358 size_t count) 2359{ 2360 unsigned long tmp; 2361 int ret; 2362 2363 ret = kstrtoul(page, 0, &tmp); 2364 if (ret < 0) { 2365 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2366 return ret; 2367 } 2368 if ((tmp != 0) && (tmp != 1)) { 2369 pr_err("Illegal value for alua_tg_pt_write_md:" 2370 " %lu\n", tmp); 2371 return -EINVAL; 2372 } 2373 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; 2374 2375 return count; 2376} 2377 2378int core_setup_alua(struct se_device *dev) 2379{ 2380 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && 2381 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2382 struct t10_alua_lu_gp_member *lu_gp_mem; 2383 2384 /* 2385 * Associate this struct se_device with the default ALUA 2386 * LUN Group. 2387 */ 2388 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2389 if (IS_ERR(lu_gp_mem)) 2390 return PTR_ERR(lu_gp_mem); 2391 2392 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2393 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2394 default_lu_gp); 2395 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2396 2397 pr_debug("%s: Adding to default ALUA LU Group:" 2398 " core/alua/lu_gps/default_lu_gp\n", 2399 dev->transport->name); 2400 } 2401 2402 return 0; 2403} 2404