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_proto.h> 32 #include <asm/unaligned.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_backend.h> 36 #include <target/target_core_fabric.h> 37 #include <target/target_core_configfs.h> 38 39 #include "target_core_internal.h" 40 #include "target_core_alua.h" 41 #include "target_core_ua.h" 42 43 static sense_reason_t core_alua_check_transition(int state, int valid, 44 int *primary); 45 static int core_alua_set_tg_pt_secondary_state( 46 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 47 struct se_port *port, int explicit, int offline); 48 49 static char *core_alua_dump_state(int state); 50 51 static u16 alua_lu_gps_counter; 52 static u32 alua_lu_gps_count; 53 54 static DEFINE_SPINLOCK(lu_gps_lock); 55 static LIST_HEAD(lu_gps_list); 56 57 struct t10_alua_lu_gp *default_lu_gp; 58 59 /* 60 * REPORT REFERRALS 61 * 62 * See sbc3r35 section 5.23 63 */ 64 sense_reason_t 65 target_emulate_report_referrals(struct se_cmd *cmd) 66 { 67 struct se_device *dev = cmd->se_dev; 68 struct t10_alua_lba_map *map; 69 struct t10_alua_lba_map_member *map_mem; 70 unsigned char *buf; 71 u32 rd_len = 0, off; 72 73 if (cmd->data_length < 4) { 74 pr_warn("REPORT REFERRALS allocation length %u too" 75 " small\n", cmd->data_length); 76 return TCM_INVALID_CDB_FIELD; 77 } 78 79 buf = transport_kmap_data_sg(cmd); 80 if (!buf) 81 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 82 83 off = 4; 84 spin_lock(&dev->t10_alua.lba_map_lock); 85 if (list_empty(&dev->t10_alua.lba_map_list)) { 86 spin_unlock(&dev->t10_alua.lba_map_lock); 87 transport_kunmap_data_sg(cmd); 88 89 return TCM_UNSUPPORTED_SCSI_OPCODE; 90 } 91 92 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 93 lba_map_list) { 94 int desc_num = off + 3; 95 int pg_num; 96 97 off += 4; 98 if (cmd->data_length > off) 99 put_unaligned_be64(map->lba_map_first_lba, &buf[off]); 100 off += 8; 101 if (cmd->data_length > off) 102 put_unaligned_be64(map->lba_map_last_lba, &buf[off]); 103 off += 8; 104 rd_len += 20; 105 pg_num = 0; 106 list_for_each_entry(map_mem, &map->lba_map_mem_list, 107 lba_map_mem_list) { 108 int alua_state = map_mem->lba_map_mem_alua_state; 109 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; 110 111 if (cmd->data_length > off) 112 buf[off] = alua_state & 0x0f; 113 off += 2; 114 if (cmd->data_length > off) 115 buf[off] = (alua_pg_id >> 8) & 0xff; 116 off++; 117 if (cmd->data_length > off) 118 buf[off] = (alua_pg_id & 0xff); 119 off++; 120 rd_len += 4; 121 pg_num++; 122 } 123 if (cmd->data_length > desc_num) 124 buf[desc_num] = pg_num; 125 } 126 spin_unlock(&dev->t10_alua.lba_map_lock); 127 128 /* 129 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 130 */ 131 put_unaligned_be16(rd_len, &buf[2]); 132 133 transport_kunmap_data_sg(cmd); 134 135 target_complete_cmd(cmd, GOOD); 136 return 0; 137 } 138 139 /* 140 * REPORT_TARGET_PORT_GROUPS 141 * 142 * See spc4r17 section 6.27 143 */ 144 sense_reason_t 145 target_emulate_report_target_port_groups(struct se_cmd *cmd) 146 { 147 struct se_device *dev = cmd->se_dev; 148 struct se_port *port; 149 struct t10_alua_tg_pt_gp *tg_pt_gp; 150 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 151 unsigned char *buf; 152 u32 rd_len = 0, off; 153 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 154 155 /* 156 * Skip over RESERVED area to first Target port group descriptor 157 * depending on the PARAMETER DATA FORMAT type.. 158 */ 159 if (ext_hdr != 0) 160 off = 8; 161 else 162 off = 4; 163 164 if (cmd->data_length < off) { 165 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 166 " small for %s header\n", cmd->data_length, 167 (ext_hdr) ? "extended" : "normal"); 168 return TCM_INVALID_CDB_FIELD; 169 } 170 buf = transport_kmap_data_sg(cmd); 171 if (!buf) 172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 173 174 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 175 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 176 tg_pt_gp_list) { 177 /* 178 * Check if the Target port group and Target port descriptor list 179 * based on tg_pt_gp_members count will fit into the response payload. 180 * Otherwise, bump rd_len to let the initiator know we have exceeded 181 * the allocation length and the response is truncated. 182 */ 183 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 184 cmd->data_length) { 185 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 186 continue; 187 } 188 /* 189 * PREF: Preferred target port bit, determine if this 190 * bit should be set for port group. 191 */ 192 if (tg_pt_gp->tg_pt_gp_pref) 193 buf[off] = 0x80; 194 /* 195 * Set the ASYMMETRIC ACCESS State 196 */ 197 buf[off++] |= (atomic_read( 198 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 199 /* 200 * Set supported ASYMMETRIC ACCESS State bits 201 */ 202 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; 203 /* 204 * TARGET PORT GROUP 205 */ 206 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 207 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 208 209 off++; /* Skip over Reserved */ 210 /* 211 * STATUS CODE 212 */ 213 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 214 /* 215 * Vendor Specific field 216 */ 217 buf[off++] = 0x00; 218 /* 219 * TARGET PORT COUNT 220 */ 221 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 222 rd_len += 8; 223 224 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 225 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, 226 tg_pt_gp_mem_list) { 227 port = tg_pt_gp_mem->tg_pt; 228 /* 229 * Start Target Port descriptor format 230 * 231 * See spc4r17 section 6.2.7 Table 247 232 */ 233 off += 2; /* Skip over Obsolete */ 234 /* 235 * Set RELATIVE TARGET PORT IDENTIFIER 236 */ 237 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 238 buf[off++] = (port->sep_rtpi & 0xff); 239 rd_len += 4; 240 } 241 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 242 } 243 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 244 /* 245 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 246 */ 247 put_unaligned_be32(rd_len, &buf[0]); 248 249 /* 250 * Fill in the Extended header parameter data format if requested 251 */ 252 if (ext_hdr != 0) { 253 buf[4] = 0x10; 254 /* 255 * Set the implicit transition time (in seconds) for the application 256 * client to use as a base for it's transition timeout value. 257 * 258 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 259 * this CDB was received upon to determine this value individually 260 * for ALUA target port group. 261 */ 262 port = cmd->se_lun->lun_sep; 263 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 264 if (tg_pt_gp_mem) { 265 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 266 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 267 if (tg_pt_gp) 268 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; 269 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 270 } 271 } 272 transport_kunmap_data_sg(cmd); 273 274 target_complete_cmd(cmd, GOOD); 275 return 0; 276 } 277 278 /* 279 * SET_TARGET_PORT_GROUPS for explicit ALUA operation. 280 * 281 * See spc4r17 section 6.35 282 */ 283 sense_reason_t 284 target_emulate_set_target_port_groups(struct se_cmd *cmd) 285 { 286 struct se_device *dev = cmd->se_dev; 287 struct se_port *port, *l_port = cmd->se_lun->lun_sep; 288 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 289 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 290 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; 291 unsigned char *buf; 292 unsigned char *ptr; 293 sense_reason_t rc = TCM_NO_SENSE; 294 u32 len = 4; /* Skip over RESERVED area in header */ 295 int alua_access_state, primary = 0, valid_states; 296 u16 tg_pt_id, rtpi; 297 298 if (!l_port) 299 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 300 301 if (cmd->data_length < 4) { 302 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 303 " small\n", cmd->data_length); 304 return TCM_INVALID_PARAMETER_LIST; 305 } 306 307 buf = transport_kmap_data_sg(cmd); 308 if (!buf) 309 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 310 311 /* 312 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed 313 * for the local tg_pt_gp. 314 */ 315 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; 316 if (!l_tg_pt_gp_mem) { 317 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); 318 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 319 goto out; 320 } 321 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 322 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; 323 if (!l_tg_pt_gp) { 324 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 325 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); 326 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 327 goto out; 328 } 329 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 330 331 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { 332 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 333 " while TPGS_EXPLICIT_ALUA is disabled\n"); 334 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 335 goto out; 336 } 337 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 338 339 ptr = &buf[4]; /* Skip over RESERVED area in header */ 340 341 while (len < cmd->data_length) { 342 bool found = false; 343 alua_access_state = (ptr[0] & 0x0f); 344 /* 345 * Check the received ALUA access state, and determine if 346 * the state is a primary or secondary target port asymmetric 347 * access state. 348 */ 349 rc = core_alua_check_transition(alua_access_state, 350 valid_states, &primary); 351 if (rc) { 352 /* 353 * If the SET TARGET PORT GROUPS attempts to establish 354 * an invalid combination of target port asymmetric 355 * access states or attempts to establish an 356 * unsupported target port asymmetric access state, 357 * then the command shall be terminated with CHECK 358 * CONDITION status, with the sense key set to ILLEGAL 359 * REQUEST, and the additional sense code set to INVALID 360 * FIELD IN PARAMETER LIST. 361 */ 362 goto out; 363 } 364 365 /* 366 * If the ASYMMETRIC ACCESS STATE field (see table 267) 367 * specifies a primary target port asymmetric access state, 368 * then the TARGET PORT GROUP OR TARGET PORT field specifies 369 * a primary target port group for which the primary target 370 * port asymmetric access state shall be changed. If the 371 * ASYMMETRIC ACCESS STATE field specifies a secondary target 372 * port asymmetric access state, then the TARGET PORT GROUP OR 373 * TARGET PORT field specifies the relative target port 374 * identifier (see 3.1.120) of the target port for which the 375 * secondary target port asymmetric access state shall be 376 * changed. 377 */ 378 if (primary) { 379 tg_pt_id = get_unaligned_be16(ptr + 2); 380 /* 381 * Locate the matching target port group ID from 382 * the global tg_pt_gp list 383 */ 384 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 385 list_for_each_entry(tg_pt_gp, 386 &dev->t10_alua.tg_pt_gps_list, 387 tg_pt_gp_list) { 388 if (!tg_pt_gp->tg_pt_gp_valid_id) 389 continue; 390 391 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 392 continue; 393 394 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 395 396 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 397 398 if (!core_alua_do_port_transition(tg_pt_gp, 399 dev, l_port, nacl, 400 alua_access_state, 1)) 401 found = true; 402 403 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 404 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 405 break; 406 } 407 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 408 } else { 409 /* 410 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 411 * the Target Port in question for the the incoming 412 * SET_TARGET_PORT_GROUPS op. 413 */ 414 rtpi = get_unaligned_be16(ptr + 2); 415 /* 416 * Locate the matching relative target port identifier 417 * for the struct se_device storage object. 418 */ 419 spin_lock(&dev->se_port_lock); 420 list_for_each_entry(port, &dev->dev_sep_list, 421 sep_list) { 422 if (port->sep_rtpi != rtpi) 423 continue; 424 425 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 426 427 spin_unlock(&dev->se_port_lock); 428 429 if (!core_alua_set_tg_pt_secondary_state( 430 tg_pt_gp_mem, port, 1, 1)) 431 found = true; 432 433 spin_lock(&dev->se_port_lock); 434 break; 435 } 436 spin_unlock(&dev->se_port_lock); 437 } 438 439 if (!found) { 440 rc = TCM_INVALID_PARAMETER_LIST; 441 goto out; 442 } 443 444 ptr += 4; 445 len += 4; 446 } 447 448 out: 449 transport_kunmap_data_sg(cmd); 450 if (!rc) 451 target_complete_cmd(cmd, GOOD); 452 return rc; 453 } 454 455 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq) 456 { 457 /* 458 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 459 * The ALUA additional sense code qualifier (ASCQ) is determined 460 * by the ALUA primary or secondary access state.. 461 */ 462 pr_debug("[%s]: ALUA TG Port not available, " 463 "SenseKey: NOT_READY, ASC/ASCQ: " 464 "0x04/0x%02x\n", 465 cmd->se_tfo->get_fabric_name(), alua_ascq); 466 467 cmd->scsi_asc = 0x04; 468 cmd->scsi_ascq = alua_ascq; 469 } 470 471 static inline void core_alua_state_nonoptimized( 472 struct se_cmd *cmd, 473 unsigned char *cdb, 474 int nonop_delay_msecs) 475 { 476 /* 477 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 478 * later to determine if processing of this cmd needs to be 479 * temporarily delayed for the Active/NonOptimized primary access state. 480 */ 481 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 482 cmd->alua_nonop_delay = nonop_delay_msecs; 483 } 484 485 static inline int core_alua_state_lba_dependent( 486 struct se_cmd *cmd, 487 struct t10_alua_tg_pt_gp *tg_pt_gp) 488 { 489 struct se_device *dev = cmd->se_dev; 490 u64 segment_size, segment_mult, sectors, lba; 491 492 /* Only need to check for cdb actually containing LBAs */ 493 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 494 return 0; 495 496 spin_lock(&dev->t10_alua.lba_map_lock); 497 segment_size = dev->t10_alua.lba_map_segment_size; 498 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 499 sectors = cmd->data_length / dev->dev_attrib.block_size; 500 501 lba = cmd->t_task_lba; 502 while (lba < cmd->t_task_lba + sectors) { 503 struct t10_alua_lba_map *cur_map = NULL, *map; 504 struct t10_alua_lba_map_member *map_mem; 505 506 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 507 lba_map_list) { 508 u64 start_lba, last_lba; 509 u64 first_lba = map->lba_map_first_lba; 510 511 if (segment_mult) { 512 u64 tmp = lba; 513 start_lba = do_div(tmp, segment_size * segment_mult); 514 515 last_lba = first_lba + segment_size - 1; 516 if (start_lba >= first_lba && 517 start_lba <= last_lba) { 518 lba += segment_size; 519 cur_map = map; 520 break; 521 } 522 } else { 523 last_lba = map->lba_map_last_lba; 524 if (lba >= first_lba && lba <= last_lba) { 525 lba = last_lba + 1; 526 cur_map = map; 527 break; 528 } 529 } 530 } 531 if (!cur_map) { 532 spin_unlock(&dev->t10_alua.lba_map_lock); 533 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 534 return 1; 535 } 536 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 537 lba_map_mem_list) { 538 if (map_mem->lba_map_mem_alua_pg_id != 539 tg_pt_gp->tg_pt_gp_id) 540 continue; 541 switch(map_mem->lba_map_mem_alua_state) { 542 case ALUA_ACCESS_STATE_STANDBY: 543 spin_unlock(&dev->t10_alua.lba_map_lock); 544 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 545 return 1; 546 case ALUA_ACCESS_STATE_UNAVAILABLE: 547 spin_unlock(&dev->t10_alua.lba_map_lock); 548 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 549 return 1; 550 default: 551 break; 552 } 553 } 554 } 555 spin_unlock(&dev->t10_alua.lba_map_lock); 556 return 0; 557 } 558 559 static inline int core_alua_state_standby( 560 struct se_cmd *cmd, 561 unsigned char *cdb) 562 { 563 /* 564 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 565 * spc4r17 section 5.9.2.4.4 566 */ 567 switch (cdb[0]) { 568 case INQUIRY: 569 case LOG_SELECT: 570 case LOG_SENSE: 571 case MODE_SELECT: 572 case MODE_SENSE: 573 case REPORT_LUNS: 574 case RECEIVE_DIAGNOSTIC: 575 case SEND_DIAGNOSTIC: 576 case READ_CAPACITY: 577 return 0; 578 case SERVICE_ACTION_IN_16: 579 switch (cdb[1] & 0x1f) { 580 case SAI_READ_CAPACITY_16: 581 return 0; 582 default: 583 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 584 return 1; 585 } 586 case MAINTENANCE_IN: 587 switch (cdb[1] & 0x1f) { 588 case MI_REPORT_TARGET_PGS: 589 return 0; 590 default: 591 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 592 return 1; 593 } 594 case MAINTENANCE_OUT: 595 switch (cdb[1]) { 596 case MO_SET_TARGET_PGS: 597 return 0; 598 default: 599 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 600 return 1; 601 } 602 case REQUEST_SENSE: 603 case PERSISTENT_RESERVE_IN: 604 case PERSISTENT_RESERVE_OUT: 605 case READ_BUFFER: 606 case WRITE_BUFFER: 607 return 0; 608 default: 609 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY); 610 return 1; 611 } 612 613 return 0; 614 } 615 616 static inline int core_alua_state_unavailable( 617 struct se_cmd *cmd, 618 unsigned char *cdb) 619 { 620 /* 621 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 622 * spc4r17 section 5.9.2.4.5 623 */ 624 switch (cdb[0]) { 625 case INQUIRY: 626 case REPORT_LUNS: 627 return 0; 628 case MAINTENANCE_IN: 629 switch (cdb[1] & 0x1f) { 630 case MI_REPORT_TARGET_PGS: 631 return 0; 632 default: 633 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 634 return 1; 635 } 636 case MAINTENANCE_OUT: 637 switch (cdb[1]) { 638 case MO_SET_TARGET_PGS: 639 return 0; 640 default: 641 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 642 return 1; 643 } 644 case REQUEST_SENSE: 645 case READ_BUFFER: 646 case WRITE_BUFFER: 647 return 0; 648 default: 649 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE); 650 return 1; 651 } 652 653 return 0; 654 } 655 656 static inline int core_alua_state_transition( 657 struct se_cmd *cmd, 658 unsigned char *cdb) 659 { 660 /* 661 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 662 * spc4r17 section 5.9.2.5 663 */ 664 switch (cdb[0]) { 665 case INQUIRY: 666 case REPORT_LUNS: 667 return 0; 668 case MAINTENANCE_IN: 669 switch (cdb[1] & 0x1f) { 670 case MI_REPORT_TARGET_PGS: 671 return 0; 672 default: 673 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 674 return 1; 675 } 676 case REQUEST_SENSE: 677 case READ_BUFFER: 678 case WRITE_BUFFER: 679 return 0; 680 default: 681 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION); 682 return 1; 683 } 684 685 return 0; 686 } 687 688 /* 689 * return 1: Is used to signal LUN not accessible, and check condition/not ready 690 * return 0: Used to signal success 691 * return -1: Used to signal failure, and invalid cdb field 692 */ 693 sense_reason_t 694 target_alua_state_check(struct se_cmd *cmd) 695 { 696 struct se_device *dev = cmd->se_dev; 697 unsigned char *cdb = cmd->t_task_cdb; 698 struct se_lun *lun = cmd->se_lun; 699 struct se_port *port = lun->lun_sep; 700 struct t10_alua_tg_pt_gp *tg_pt_gp; 701 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 702 int out_alua_state, nonop_delay_msecs; 703 704 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 705 return 0; 706 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 707 return 0; 708 709 if (!port) 710 return 0; 711 /* 712 * First, check for a struct se_port specific secondary ALUA target port 713 * access state: OFFLINE 714 */ 715 if (atomic_read(&port->sep_tg_pt_secondary_offline)) { 716 pr_debug("ALUA: Got secondary offline status for local" 717 " target port\n"); 718 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE); 719 return TCM_CHECK_CONDITION_NOT_READY; 720 } 721 /* 722 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the 723 * ALUA target port group, to obtain current ALUA access state. 724 * Otherwise look for the underlying struct se_device association with 725 * a ALUA logical unit group. 726 */ 727 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 728 if (!tg_pt_gp_mem) 729 return 0; 730 731 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 732 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 733 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 734 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 735 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 736 /* 737 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 738 * statement so the compiler knows explicitly to check this case first. 739 * For the Optimized ALUA access state case, we want to process the 740 * incoming fabric cmd ASAP.. 741 */ 742 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 743 return 0; 744 745 switch (out_alua_state) { 746 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 747 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs); 748 break; 749 case ALUA_ACCESS_STATE_STANDBY: 750 if (core_alua_state_standby(cmd, cdb)) 751 return TCM_CHECK_CONDITION_NOT_READY; 752 break; 753 case ALUA_ACCESS_STATE_UNAVAILABLE: 754 if (core_alua_state_unavailable(cmd, cdb)) 755 return TCM_CHECK_CONDITION_NOT_READY; 756 break; 757 case ALUA_ACCESS_STATE_TRANSITION: 758 if (core_alua_state_transition(cmd, cdb)) 759 return TCM_CHECK_CONDITION_NOT_READY; 760 break; 761 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 762 if (core_alua_state_lba_dependent(cmd, tg_pt_gp)) 763 return TCM_CHECK_CONDITION_NOT_READY; 764 break; 765 /* 766 * OFFLINE is a secondary ALUA target port group access state, that is 767 * handled above with struct se_port->sep_tg_pt_secondary_offline=1 768 */ 769 case ALUA_ACCESS_STATE_OFFLINE: 770 default: 771 pr_err("Unknown ALUA access state: 0x%02x\n", 772 out_alua_state); 773 return TCM_INVALID_CDB_FIELD; 774 } 775 776 return 0; 777 } 778 779 /* 780 * Check implicit and explicit ALUA state change request. 781 */ 782 static sense_reason_t 783 core_alua_check_transition(int state, int valid, int *primary) 784 { 785 /* 786 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 787 * defined as primary target port asymmetric access states. 788 */ 789 switch (state) { 790 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 791 if (!(valid & ALUA_AO_SUP)) 792 goto not_supported; 793 *primary = 1; 794 break; 795 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 796 if (!(valid & ALUA_AN_SUP)) 797 goto not_supported; 798 *primary = 1; 799 break; 800 case ALUA_ACCESS_STATE_STANDBY: 801 if (!(valid & ALUA_S_SUP)) 802 goto not_supported; 803 *primary = 1; 804 break; 805 case ALUA_ACCESS_STATE_UNAVAILABLE: 806 if (!(valid & ALUA_U_SUP)) 807 goto not_supported; 808 *primary = 1; 809 break; 810 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 811 if (!(valid & ALUA_LBD_SUP)) 812 goto not_supported; 813 *primary = 1; 814 break; 815 case ALUA_ACCESS_STATE_OFFLINE: 816 /* 817 * OFFLINE state is defined as a secondary target port 818 * asymmetric access state. 819 */ 820 if (!(valid & ALUA_O_SUP)) 821 goto not_supported; 822 *primary = 0; 823 break; 824 case ALUA_ACCESS_STATE_TRANSITION: 825 /* 826 * Transitioning is set internally, and 827 * cannot be selected manually. 828 */ 829 goto not_supported; 830 default: 831 pr_err("Unknown ALUA access state: 0x%02x\n", state); 832 return TCM_INVALID_PARAMETER_LIST; 833 } 834 835 return 0; 836 837 not_supported: 838 pr_err("ALUA access state %s not supported", 839 core_alua_dump_state(state)); 840 return TCM_INVALID_PARAMETER_LIST; 841 } 842 843 static char *core_alua_dump_state(int state) 844 { 845 switch (state) { 846 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: 847 return "Active/Optimized"; 848 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 849 return "Active/NonOptimized"; 850 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 851 return "LBA Dependent"; 852 case ALUA_ACCESS_STATE_STANDBY: 853 return "Standby"; 854 case ALUA_ACCESS_STATE_UNAVAILABLE: 855 return "Unavailable"; 856 case ALUA_ACCESS_STATE_OFFLINE: 857 return "Offline"; 858 case ALUA_ACCESS_STATE_TRANSITION: 859 return "Transitioning"; 860 default: 861 return "Unknown"; 862 } 863 864 return NULL; 865 } 866 867 char *core_alua_dump_status(int status) 868 { 869 switch (status) { 870 case ALUA_STATUS_NONE: 871 return "None"; 872 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG: 873 return "Altered by Explicit STPG"; 874 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA: 875 return "Altered by Implicit ALUA"; 876 default: 877 return "Unknown"; 878 } 879 880 return NULL; 881 } 882 883 /* 884 * Used by fabric modules to determine when we need to delay processing 885 * for the Active/NonOptimized paths.. 886 */ 887 int core_alua_check_nonop_delay( 888 struct se_cmd *cmd) 889 { 890 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 891 return 0; 892 if (in_interrupt()) 893 return 0; 894 /* 895 * The ALUA Active/NonOptimized access state delay can be disabled 896 * in via configfs with a value of zero 897 */ 898 if (!cmd->alua_nonop_delay) 899 return 0; 900 /* 901 * struct se_cmd->alua_nonop_delay gets set by a target port group 902 * defined interval in core_alua_state_nonoptimized() 903 */ 904 msleep_interruptible(cmd->alua_nonop_delay); 905 return 0; 906 } 907 EXPORT_SYMBOL(core_alua_check_nonop_delay); 908 909 /* 910 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex 911 * 912 */ 913 static int core_alua_write_tpg_metadata( 914 const char *path, 915 unsigned char *md_buf, 916 u32 md_buf_len) 917 { 918 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 919 int ret; 920 921 if (IS_ERR(file)) { 922 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 923 return -ENODEV; 924 } 925 ret = kernel_write(file, md_buf, md_buf_len, 0); 926 if (ret < 0) 927 pr_err("Error writing ALUA metadata file: %s\n", path); 928 fput(file); 929 return (ret < 0) ? -EIO : 0; 930 } 931 932 /* 933 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 934 */ 935 static int core_alua_update_tpg_primary_metadata( 936 struct t10_alua_tg_pt_gp *tg_pt_gp) 937 { 938 unsigned char *md_buf; 939 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 940 char path[ALUA_METADATA_PATH_LEN]; 941 int len, rc; 942 943 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 944 if (!md_buf) { 945 pr_err("Unable to allocate buf for ALUA metadata\n"); 946 return -ENOMEM; 947 } 948 949 memset(path, 0, ALUA_METADATA_PATH_LEN); 950 951 len = snprintf(md_buf, ALUA_MD_BUF_LEN, 952 "tg_pt_gp_id=%hu\n" 953 "alua_access_state=0x%02x\n" 954 "alua_access_status=0x%02x\n", 955 tg_pt_gp->tg_pt_gp_id, 956 tg_pt_gp->tg_pt_gp_alua_pending_state, 957 tg_pt_gp->tg_pt_gp_alua_access_status); 958 959 snprintf(path, ALUA_METADATA_PATH_LEN, 960 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], 961 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 962 963 rc = core_alua_write_tpg_metadata(path, md_buf, len); 964 kfree(md_buf); 965 return rc; 966 } 967 968 static void core_alua_do_transition_tg_pt_work(struct work_struct *work) 969 { 970 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, 971 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work); 972 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 973 struct se_dev_entry *se_deve; 974 struct se_lun_acl *lacl; 975 struct se_port *port; 976 struct t10_alua_tg_pt_gp_member *mem; 977 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == 978 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); 979 980 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 981 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, 982 tg_pt_gp_mem_list) { 983 port = mem->tg_pt; 984 /* 985 * After an implicit target port asymmetric access state 986 * change, a device server shall establish a unit attention 987 * condition for the initiator port associated with every I_T 988 * nexus with the additional sense code set to ASYMMETRIC 989 * ACCESS STATE CHANGED. 990 * 991 * After an explicit target port asymmetric access state 992 * change, a device server shall establish a unit attention 993 * condition with the additional sense code set to ASYMMETRIC 994 * ACCESS STATE CHANGED for the initiator port associated with 995 * every I_T nexus other than the I_T nexus on which the SET 996 * TARGET PORT GROUPS command 997 */ 998 atomic_inc_mb(&mem->tg_pt_gp_mem_ref_cnt); 999 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1000 1001 spin_lock_bh(&port->sep_alua_lock); 1002 list_for_each_entry(se_deve, &port->sep_alua_list, 1003 alua_port_list) { 1004 lacl = se_deve->se_lun_acl; 1005 /* 1006 * se_deve->se_lun_acl pointer may be NULL for a 1007 * entry created without explicit Node+MappedLUN ACLs 1008 */ 1009 if (!lacl) 1010 continue; 1011 1012 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 1013 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 1014 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 1015 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) && 1016 (tg_pt_gp->tg_pt_gp_alua_port != NULL) && 1017 (tg_pt_gp->tg_pt_gp_alua_port == port)) 1018 continue; 1019 1020 core_scsi3_ua_allocate(lacl->se_lun_nacl, 1021 se_deve->mapped_lun, 0x2A, 1022 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1023 } 1024 spin_unlock_bh(&port->sep_alua_lock); 1025 1026 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1027 atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt); 1028 } 1029 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1030 /* 1031 * Update the ALUA metadata buf that has been allocated in 1032 * core_alua_do_port_transition(), this metadata will be written 1033 * to struct file. 1034 * 1035 * Note that there is the case where we do not want to update the 1036 * metadata when the saved metadata is being parsed in userspace 1037 * when setting the existing port access state and access status. 1038 * 1039 * Also note that the failure to write out the ALUA metadata to 1040 * struct file does NOT affect the actual ALUA transition. 1041 */ 1042 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1043 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1044 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1045 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1046 } 1047 /* 1048 * Set the current primary ALUA access state to the requested new state 1049 */ 1050 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1051 tg_pt_gp->tg_pt_gp_alua_pending_state); 1052 1053 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1054 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1055 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1056 tg_pt_gp->tg_pt_gp_id, 1057 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1058 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1059 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1060 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1061 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1062 1063 if (tg_pt_gp->tg_pt_gp_transition_complete) 1064 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1065 } 1066 1067 static int core_alua_do_transition_tg_pt( 1068 struct t10_alua_tg_pt_gp *tg_pt_gp, 1069 int new_state, 1070 int explicit) 1071 { 1072 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1073 DECLARE_COMPLETION_ONSTACK(wait); 1074 1075 /* Nothing to be done here */ 1076 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1077 return 0; 1078 1079 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1080 return -EAGAIN; 1081 1082 /* 1083 * Flush any pending transitions 1084 */ 1085 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && 1086 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1087 ALUA_ACCESS_STATE_TRANSITION) { 1088 /* Just in case */ 1089 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1090 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1091 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1092 wait_for_completion(&wait); 1093 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1094 return 0; 1095 } 1096 1097 /* 1098 * Save the old primary ALUA access state, and set the current state 1099 * to ALUA_ACCESS_STATE_TRANSITION. 1100 */ 1101 tg_pt_gp->tg_pt_gp_alua_previous_state = 1102 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1103 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1104 1105 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1106 ALUA_ACCESS_STATE_TRANSITION); 1107 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1108 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1109 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1110 1111 /* 1112 * Check for the optional ALUA primary state transition delay 1113 */ 1114 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1115 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1116 1117 /* 1118 * Take a reference for workqueue item 1119 */ 1120 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1121 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1122 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1123 1124 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { 1125 unsigned long transition_tmo; 1126 1127 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; 1128 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1129 &tg_pt_gp->tg_pt_gp_transition_work, 1130 transition_tmo); 1131 } else { 1132 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1133 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1134 &tg_pt_gp->tg_pt_gp_transition_work, 0); 1135 wait_for_completion(&wait); 1136 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1137 } 1138 1139 return 0; 1140 } 1141 1142 int core_alua_do_port_transition( 1143 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1144 struct se_device *l_dev, 1145 struct se_port *l_port, 1146 struct se_node_acl *l_nacl, 1147 int new_state, 1148 int explicit) 1149 { 1150 struct se_device *dev; 1151 struct t10_alua_lu_gp *lu_gp; 1152 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1153 struct t10_alua_tg_pt_gp *tg_pt_gp; 1154 int primary, valid_states, rc = 0; 1155 1156 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1157 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1158 return -EINVAL; 1159 1160 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1161 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1162 lu_gp = local_lu_gp_mem->lu_gp; 1163 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1164 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1165 /* 1166 * For storage objects that are members of the 'default_lu_gp', 1167 * we only do transition on the passed *l_tp_pt_gp, and not 1168 * on all of the matching target port groups IDs in default_lu_gp. 1169 */ 1170 if (!lu_gp->lu_gp_id) { 1171 /* 1172 * core_alua_do_transition_tg_pt() will always return 1173 * success. 1174 */ 1175 l_tg_pt_gp->tg_pt_gp_alua_port = l_port; 1176 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1177 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1178 new_state, explicit); 1179 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1180 return rc; 1181 } 1182 /* 1183 * For all other LU groups aside from 'default_lu_gp', walk all of 1184 * the associated storage objects looking for a matching target port 1185 * group ID from the local target port group. 1186 */ 1187 spin_lock(&lu_gp->lu_gp_lock); 1188 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1189 lu_gp_mem_list) { 1190 1191 dev = lu_gp_mem->lu_gp_mem_dev; 1192 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1193 spin_unlock(&lu_gp->lu_gp_lock); 1194 1195 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1196 list_for_each_entry(tg_pt_gp, 1197 &dev->t10_alua.tg_pt_gps_list, 1198 tg_pt_gp_list) { 1199 1200 if (!tg_pt_gp->tg_pt_gp_valid_id) 1201 continue; 1202 /* 1203 * If the target behavior port asymmetric access state 1204 * is changed for any target port group accessible via 1205 * a logical unit within a LU group, the target port 1206 * behavior group asymmetric access states for the same 1207 * target port group accessible via other logical units 1208 * in that LU group will also change. 1209 */ 1210 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1211 continue; 1212 1213 if (l_tg_pt_gp == tg_pt_gp) { 1214 tg_pt_gp->tg_pt_gp_alua_port = l_port; 1215 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1216 } else { 1217 tg_pt_gp->tg_pt_gp_alua_port = NULL; 1218 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1219 } 1220 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1221 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1222 /* 1223 * core_alua_do_transition_tg_pt() will always return 1224 * success. 1225 */ 1226 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1227 new_state, explicit); 1228 1229 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1230 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); 1231 if (rc) 1232 break; 1233 } 1234 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1235 1236 spin_lock(&lu_gp->lu_gp_lock); 1237 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); 1238 } 1239 spin_unlock(&lu_gp->lu_gp_lock); 1240 1241 if (!rc) { 1242 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1243 " Group IDs: %hu %s transition to primary state: %s\n", 1244 config_item_name(&lu_gp->lu_gp_group.cg_item), 1245 l_tg_pt_gp->tg_pt_gp_id, 1246 (explicit) ? "explicit" : "implicit", 1247 core_alua_dump_state(new_state)); 1248 } 1249 1250 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); 1251 return rc; 1252 } 1253 1254 /* 1255 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held 1256 */ 1257 static int core_alua_update_tpg_secondary_metadata( 1258 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1259 struct se_port *port) 1260 { 1261 unsigned char *md_buf; 1262 struct se_portal_group *se_tpg = port->sep_tpg; 1263 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1264 int len, rc; 1265 1266 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1267 if (!md_buf) { 1268 pr_err("Unable to allocate buf for ALUA metadata\n"); 1269 return -ENOMEM; 1270 } 1271 1272 memset(path, 0, ALUA_METADATA_PATH_LEN); 1273 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1274 1275 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1276 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1277 1278 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1279 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1280 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1281 1282 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1283 "alua_tg_pt_status=0x%02x\n", 1284 atomic_read(&port->sep_tg_pt_secondary_offline), 1285 port->sep_tg_pt_secondary_stat); 1286 1287 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", 1288 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1289 port->sep_lun->unpacked_lun); 1290 1291 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1292 kfree(md_buf); 1293 1294 return rc; 1295 } 1296 1297 static int core_alua_set_tg_pt_secondary_state( 1298 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1299 struct se_port *port, 1300 int explicit, 1301 int offline) 1302 { 1303 struct t10_alua_tg_pt_gp *tg_pt_gp; 1304 int trans_delay_msecs; 1305 1306 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1307 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1308 if (!tg_pt_gp) { 1309 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1310 pr_err("Unable to complete secondary state" 1311 " transition\n"); 1312 return -EINVAL; 1313 } 1314 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1315 /* 1316 * Set the secondary ALUA target port access state to OFFLINE 1317 * or release the previously secondary state for struct se_port 1318 */ 1319 if (offline) 1320 atomic_set(&port->sep_tg_pt_secondary_offline, 1); 1321 else 1322 atomic_set(&port->sep_tg_pt_secondary_offline, 0); 1323 1324 port->sep_tg_pt_secondary_stat = (explicit) ? 1325 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1326 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1327 1328 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1329 " to secondary access state: %s\n", (explicit) ? "explicit" : 1330 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1331 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1332 1333 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1334 /* 1335 * Do the optional transition delay after we set the secondary 1336 * ALUA access state. 1337 */ 1338 if (trans_delay_msecs != 0) 1339 msleep_interruptible(trans_delay_msecs); 1340 /* 1341 * See if we need to update the ALUA fabric port metadata for 1342 * secondary state and status 1343 */ 1344 if (port->sep_tg_pt_secondary_write_md) { 1345 mutex_lock(&port->sep_tg_pt_md_mutex); 1346 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port); 1347 mutex_unlock(&port->sep_tg_pt_md_mutex); 1348 } 1349 1350 return 0; 1351 } 1352 1353 struct t10_alua_lba_map * 1354 core_alua_allocate_lba_map(struct list_head *list, 1355 u64 first_lba, u64 last_lba) 1356 { 1357 struct t10_alua_lba_map *lba_map; 1358 1359 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1360 if (!lba_map) { 1361 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1362 return ERR_PTR(-ENOMEM); 1363 } 1364 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1365 lba_map->lba_map_first_lba = first_lba; 1366 lba_map->lba_map_last_lba = last_lba; 1367 1368 list_add_tail(&lba_map->lba_map_list, list); 1369 return lba_map; 1370 } 1371 1372 int 1373 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1374 int pg_id, int state) 1375 { 1376 struct t10_alua_lba_map_member *lba_map_mem; 1377 1378 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1379 lba_map_mem_list) { 1380 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1381 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1382 return -EINVAL; 1383 } 1384 } 1385 1386 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1387 if (!lba_map_mem) { 1388 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1389 return -ENOMEM; 1390 } 1391 lba_map_mem->lba_map_mem_alua_state = state; 1392 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1393 1394 list_add_tail(&lba_map_mem->lba_map_mem_list, 1395 &lba_map->lba_map_mem_list); 1396 return 0; 1397 } 1398 1399 void 1400 core_alua_free_lba_map(struct list_head *lba_list) 1401 { 1402 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1403 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1404 1405 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1406 lba_map_list) { 1407 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1408 &lba_map->lba_map_mem_list, 1409 lba_map_mem_list) { 1410 list_del(&lba_map_mem->lba_map_mem_list); 1411 kmem_cache_free(t10_alua_lba_map_mem_cache, 1412 lba_map_mem); 1413 } 1414 list_del(&lba_map->lba_map_list); 1415 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1416 } 1417 } 1418 1419 void 1420 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1421 int segment_size, int segment_mult) 1422 { 1423 struct list_head old_lba_map_list; 1424 struct t10_alua_tg_pt_gp *tg_pt_gp; 1425 int activate = 0, supported; 1426 1427 INIT_LIST_HEAD(&old_lba_map_list); 1428 spin_lock(&dev->t10_alua.lba_map_lock); 1429 dev->t10_alua.lba_map_segment_size = segment_size; 1430 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1431 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1432 if (lba_map_list) { 1433 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1434 activate = 1; 1435 } 1436 spin_unlock(&dev->t10_alua.lba_map_lock); 1437 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1438 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1439 tg_pt_gp_list) { 1440 1441 if (!tg_pt_gp->tg_pt_gp_valid_id) 1442 continue; 1443 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1444 if (activate) 1445 supported |= ALUA_LBD_SUP; 1446 else 1447 supported &= ~ALUA_LBD_SUP; 1448 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1449 } 1450 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1451 core_alua_free_lba_map(&old_lba_map_list); 1452 } 1453 1454 struct t10_alua_lu_gp * 1455 core_alua_allocate_lu_gp(const char *name, int def_group) 1456 { 1457 struct t10_alua_lu_gp *lu_gp; 1458 1459 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1460 if (!lu_gp) { 1461 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1462 return ERR_PTR(-ENOMEM); 1463 } 1464 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1465 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1466 spin_lock_init(&lu_gp->lu_gp_lock); 1467 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1468 1469 if (def_group) { 1470 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1471 lu_gp->lu_gp_valid_id = 1; 1472 alua_lu_gps_count++; 1473 } 1474 1475 return lu_gp; 1476 } 1477 1478 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1479 { 1480 struct t10_alua_lu_gp *lu_gp_tmp; 1481 u16 lu_gp_id_tmp; 1482 /* 1483 * The lu_gp->lu_gp_id may only be set once.. 1484 */ 1485 if (lu_gp->lu_gp_valid_id) { 1486 pr_warn("ALUA LU Group already has a valid ID," 1487 " ignoring request\n"); 1488 return -EINVAL; 1489 } 1490 1491 spin_lock(&lu_gps_lock); 1492 if (alua_lu_gps_count == 0x0000ffff) { 1493 pr_err("Maximum ALUA alua_lu_gps_count:" 1494 " 0x0000ffff reached\n"); 1495 spin_unlock(&lu_gps_lock); 1496 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1497 return -ENOSPC; 1498 } 1499 again: 1500 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1501 alua_lu_gps_counter++; 1502 1503 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1504 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1505 if (!lu_gp_id) 1506 goto again; 1507 1508 pr_warn("ALUA Logical Unit Group ID: %hu" 1509 " already exists, ignoring request\n", 1510 lu_gp_id); 1511 spin_unlock(&lu_gps_lock); 1512 return -EINVAL; 1513 } 1514 } 1515 1516 lu_gp->lu_gp_id = lu_gp_id_tmp; 1517 lu_gp->lu_gp_valid_id = 1; 1518 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1519 alua_lu_gps_count++; 1520 spin_unlock(&lu_gps_lock); 1521 1522 return 0; 1523 } 1524 1525 static struct t10_alua_lu_gp_member * 1526 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1527 { 1528 struct t10_alua_lu_gp_member *lu_gp_mem; 1529 1530 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1531 if (!lu_gp_mem) { 1532 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1533 return ERR_PTR(-ENOMEM); 1534 } 1535 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1536 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1537 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1538 1539 lu_gp_mem->lu_gp_mem_dev = dev; 1540 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1541 1542 return lu_gp_mem; 1543 } 1544 1545 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1546 { 1547 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1548 /* 1549 * Once we have reached this point, config_item_put() has 1550 * already been called from target_core_alua_drop_lu_gp(). 1551 * 1552 * Here, we remove the *lu_gp from the global list so that 1553 * no associations can be made while we are releasing 1554 * struct t10_alua_lu_gp. 1555 */ 1556 spin_lock(&lu_gps_lock); 1557 list_del(&lu_gp->lu_gp_node); 1558 alua_lu_gps_count--; 1559 spin_unlock(&lu_gps_lock); 1560 /* 1561 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1562 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1563 * released with core_alua_put_lu_gp_from_name() 1564 */ 1565 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1566 cpu_relax(); 1567 /* 1568 * Release reference to struct t10_alua_lu_gp * from all associated 1569 * struct se_device. 1570 */ 1571 spin_lock(&lu_gp->lu_gp_lock); 1572 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1573 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1574 if (lu_gp_mem->lu_gp_assoc) { 1575 list_del(&lu_gp_mem->lu_gp_mem_list); 1576 lu_gp->lu_gp_members--; 1577 lu_gp_mem->lu_gp_assoc = 0; 1578 } 1579 spin_unlock(&lu_gp->lu_gp_lock); 1580 /* 1581 * 1582 * lu_gp_mem is associated with a single 1583 * struct se_device->dev_alua_lu_gp_mem, and is released when 1584 * struct se_device is released via core_alua_free_lu_gp_mem(). 1585 * 1586 * If the passed lu_gp does NOT match the default_lu_gp, assume 1587 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1588 */ 1589 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1590 if (lu_gp != default_lu_gp) 1591 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1592 default_lu_gp); 1593 else 1594 lu_gp_mem->lu_gp = NULL; 1595 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1596 1597 spin_lock(&lu_gp->lu_gp_lock); 1598 } 1599 spin_unlock(&lu_gp->lu_gp_lock); 1600 1601 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1602 } 1603 1604 void core_alua_free_lu_gp_mem(struct se_device *dev) 1605 { 1606 struct t10_alua_lu_gp *lu_gp; 1607 struct t10_alua_lu_gp_member *lu_gp_mem; 1608 1609 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1610 if (!lu_gp_mem) 1611 return; 1612 1613 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1614 cpu_relax(); 1615 1616 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1617 lu_gp = lu_gp_mem->lu_gp; 1618 if (lu_gp) { 1619 spin_lock(&lu_gp->lu_gp_lock); 1620 if (lu_gp_mem->lu_gp_assoc) { 1621 list_del(&lu_gp_mem->lu_gp_mem_list); 1622 lu_gp->lu_gp_members--; 1623 lu_gp_mem->lu_gp_assoc = 0; 1624 } 1625 spin_unlock(&lu_gp->lu_gp_lock); 1626 lu_gp_mem->lu_gp = NULL; 1627 } 1628 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1629 1630 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1631 } 1632 1633 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1634 { 1635 struct t10_alua_lu_gp *lu_gp; 1636 struct config_item *ci; 1637 1638 spin_lock(&lu_gps_lock); 1639 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1640 if (!lu_gp->lu_gp_valid_id) 1641 continue; 1642 ci = &lu_gp->lu_gp_group.cg_item; 1643 if (!strcmp(config_item_name(ci), name)) { 1644 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1645 spin_unlock(&lu_gps_lock); 1646 return lu_gp; 1647 } 1648 } 1649 spin_unlock(&lu_gps_lock); 1650 1651 return NULL; 1652 } 1653 1654 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1655 { 1656 spin_lock(&lu_gps_lock); 1657 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1658 spin_unlock(&lu_gps_lock); 1659 } 1660 1661 /* 1662 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1663 */ 1664 void __core_alua_attach_lu_gp_mem( 1665 struct t10_alua_lu_gp_member *lu_gp_mem, 1666 struct t10_alua_lu_gp *lu_gp) 1667 { 1668 spin_lock(&lu_gp->lu_gp_lock); 1669 lu_gp_mem->lu_gp = lu_gp; 1670 lu_gp_mem->lu_gp_assoc = 1; 1671 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1672 lu_gp->lu_gp_members++; 1673 spin_unlock(&lu_gp->lu_gp_lock); 1674 } 1675 1676 /* 1677 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1678 */ 1679 void __core_alua_drop_lu_gp_mem( 1680 struct t10_alua_lu_gp_member *lu_gp_mem, 1681 struct t10_alua_lu_gp *lu_gp) 1682 { 1683 spin_lock(&lu_gp->lu_gp_lock); 1684 list_del(&lu_gp_mem->lu_gp_mem_list); 1685 lu_gp_mem->lu_gp = NULL; 1686 lu_gp_mem->lu_gp_assoc = 0; 1687 lu_gp->lu_gp_members--; 1688 spin_unlock(&lu_gp->lu_gp_lock); 1689 } 1690 1691 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1692 const char *name, int def_group) 1693 { 1694 struct t10_alua_tg_pt_gp *tg_pt_gp; 1695 1696 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1697 if (!tg_pt_gp) { 1698 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1699 return NULL; 1700 } 1701 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1702 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); 1703 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1704 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1705 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1706 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1707 core_alua_do_transition_tg_pt_work); 1708 tg_pt_gp->tg_pt_gp_dev = dev; 1709 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1710 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1711 /* 1712 * Enable both explicit and implicit ALUA support by default 1713 */ 1714 tg_pt_gp->tg_pt_gp_alua_access_type = 1715 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1716 /* 1717 * Set the default Active/NonOptimized Delay in milliseconds 1718 */ 1719 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1720 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1721 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1722 1723 /* 1724 * Enable all supported states 1725 */ 1726 tg_pt_gp->tg_pt_gp_alua_supported_states = 1727 ALUA_T_SUP | ALUA_O_SUP | 1728 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1729 1730 if (def_group) { 1731 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1732 tg_pt_gp->tg_pt_gp_id = 1733 dev->t10_alua.alua_tg_pt_gps_counter++; 1734 tg_pt_gp->tg_pt_gp_valid_id = 1; 1735 dev->t10_alua.alua_tg_pt_gps_count++; 1736 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1737 &dev->t10_alua.tg_pt_gps_list); 1738 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1739 } 1740 1741 return tg_pt_gp; 1742 } 1743 1744 int core_alua_set_tg_pt_gp_id( 1745 struct t10_alua_tg_pt_gp *tg_pt_gp, 1746 u16 tg_pt_gp_id) 1747 { 1748 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1749 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1750 u16 tg_pt_gp_id_tmp; 1751 1752 /* 1753 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1754 */ 1755 if (tg_pt_gp->tg_pt_gp_valid_id) { 1756 pr_warn("ALUA TG PT Group already has a valid ID," 1757 " ignoring request\n"); 1758 return -EINVAL; 1759 } 1760 1761 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1762 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1763 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1764 " 0x0000ffff reached\n"); 1765 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1766 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1767 return -ENOSPC; 1768 } 1769 again: 1770 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1771 dev->t10_alua.alua_tg_pt_gps_counter++; 1772 1773 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1774 tg_pt_gp_list) { 1775 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1776 if (!tg_pt_gp_id) 1777 goto again; 1778 1779 pr_err("ALUA Target Port Group ID: %hu already" 1780 " exists, ignoring request\n", tg_pt_gp_id); 1781 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1782 return -EINVAL; 1783 } 1784 } 1785 1786 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1787 tg_pt_gp->tg_pt_gp_valid_id = 1; 1788 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1789 &dev->t10_alua.tg_pt_gps_list); 1790 dev->t10_alua.alua_tg_pt_gps_count++; 1791 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1792 1793 return 0; 1794 } 1795 1796 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( 1797 struct se_port *port) 1798 { 1799 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1800 1801 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, 1802 GFP_KERNEL); 1803 if (!tg_pt_gp_mem) { 1804 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); 1805 return ERR_PTR(-ENOMEM); 1806 } 1807 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1808 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1809 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); 1810 1811 tg_pt_gp_mem->tg_pt = port; 1812 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; 1813 1814 return tg_pt_gp_mem; 1815 } 1816 1817 void core_alua_free_tg_pt_gp( 1818 struct t10_alua_tg_pt_gp *tg_pt_gp) 1819 { 1820 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1821 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; 1822 1823 /* 1824 * Once we have reached this point, config_item_put() has already 1825 * been called from target_core_alua_drop_tg_pt_gp(). 1826 * 1827 * Here we remove *tg_pt_gp from the global list so that 1828 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1829 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1830 */ 1831 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1832 list_del(&tg_pt_gp->tg_pt_gp_list); 1833 dev->t10_alua.alua_tg_pt_gps_counter--; 1834 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1835 1836 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1837 1838 /* 1839 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1840 * core_alua_get_tg_pt_gp_by_name() in 1841 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1842 * to be released with core_alua_put_tg_pt_gp_from_name(). 1843 */ 1844 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1845 cpu_relax(); 1846 1847 /* 1848 * Release reference to struct t10_alua_tg_pt_gp from all associated 1849 * struct se_port. 1850 */ 1851 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1852 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, 1853 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { 1854 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1855 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1856 tg_pt_gp->tg_pt_gp_members--; 1857 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1858 } 1859 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1860 /* 1861 * tg_pt_gp_mem is associated with a single 1862 * se_port->sep_alua_tg_pt_gp_mem, and is released via 1863 * core_alua_free_tg_pt_gp_mem(). 1864 * 1865 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1866 * assume we want to re-associate a given tg_pt_gp_mem with 1867 * default_tg_pt_gp. 1868 */ 1869 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1870 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1871 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1872 dev->t10_alua.default_tg_pt_gp); 1873 } else 1874 tg_pt_gp_mem->tg_pt_gp = NULL; 1875 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1876 1877 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1878 } 1879 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1880 1881 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1882 } 1883 1884 void core_alua_free_tg_pt_gp_mem(struct se_port *port) 1885 { 1886 struct t10_alua_tg_pt_gp *tg_pt_gp; 1887 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1888 1889 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1890 if (!tg_pt_gp_mem) 1891 return; 1892 1893 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) 1894 cpu_relax(); 1895 1896 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1897 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1898 if (tg_pt_gp) { 1899 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1900 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1901 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1902 tg_pt_gp->tg_pt_gp_members--; 1903 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1904 } 1905 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1906 tg_pt_gp_mem->tg_pt_gp = NULL; 1907 } 1908 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1909 1910 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); 1911 } 1912 1913 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1914 struct se_device *dev, const char *name) 1915 { 1916 struct t10_alua_tg_pt_gp *tg_pt_gp; 1917 struct config_item *ci; 1918 1919 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1920 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1921 tg_pt_gp_list) { 1922 if (!tg_pt_gp->tg_pt_gp_valid_id) 1923 continue; 1924 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1925 if (!strcmp(config_item_name(ci), name)) { 1926 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1927 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1928 return tg_pt_gp; 1929 } 1930 } 1931 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1932 1933 return NULL; 1934 } 1935 1936 static void core_alua_put_tg_pt_gp_from_name( 1937 struct t10_alua_tg_pt_gp *tg_pt_gp) 1938 { 1939 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1940 1941 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1942 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1943 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1944 } 1945 1946 /* 1947 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1948 */ 1949 void __core_alua_attach_tg_pt_gp_mem( 1950 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1951 struct t10_alua_tg_pt_gp *tg_pt_gp) 1952 { 1953 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1954 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; 1955 tg_pt_gp_mem->tg_pt_gp_assoc = 1; 1956 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, 1957 &tg_pt_gp->tg_pt_gp_mem_list); 1958 tg_pt_gp->tg_pt_gp_members++; 1959 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1960 } 1961 1962 /* 1963 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1964 */ 1965 static void __core_alua_drop_tg_pt_gp_mem( 1966 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1967 struct t10_alua_tg_pt_gp *tg_pt_gp) 1968 { 1969 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1970 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1971 tg_pt_gp_mem->tg_pt_gp = NULL; 1972 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1973 tg_pt_gp->tg_pt_gp_members--; 1974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1975 } 1976 1977 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) 1978 { 1979 struct config_item *tg_pt_ci; 1980 struct t10_alua_tg_pt_gp *tg_pt_gp; 1981 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1982 ssize_t len = 0; 1983 1984 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1985 if (!tg_pt_gp_mem) 1986 return len; 1987 1988 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1989 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1990 if (tg_pt_gp) { 1991 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1992 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1993 " %hu\nTG Port Primary Access State: %s\nTG Port " 1994 "Primary Access Status: %s\nTG Port Secondary Access" 1995 " State: %s\nTG Port Secondary Access Status: %s\n", 1996 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1997 core_alua_dump_state(atomic_read( 1998 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1999 core_alua_dump_status( 2000 tg_pt_gp->tg_pt_gp_alua_access_status), 2001 (atomic_read(&port->sep_tg_pt_secondary_offline)) ? 2002 "Offline" : "None", 2003 core_alua_dump_status(port->sep_tg_pt_secondary_stat)); 2004 } 2005 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2006 2007 return len; 2008 } 2009 2010 ssize_t core_alua_store_tg_pt_gp_info( 2011 struct se_port *port, 2012 const char *page, 2013 size_t count) 2014 { 2015 struct se_portal_group *tpg; 2016 struct se_lun *lun; 2017 struct se_device *dev = port->sep_lun->lun_se_dev; 2018 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 2019 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2020 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 2021 int move = 0; 2022 2023 tpg = port->sep_tpg; 2024 lun = port->sep_lun; 2025 2026 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 2027 if (!tg_pt_gp_mem) 2028 return 0; 2029 2030 if (count > TG_PT_GROUP_NAME_BUF) { 2031 pr_err("ALUA Target Port Group alias too large!\n"); 2032 return -EINVAL; 2033 } 2034 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 2035 memcpy(buf, page, count); 2036 /* 2037 * Any ALUA target port group alias besides "NULL" means we will be 2038 * making a new group association. 2039 */ 2040 if (strcmp(strstrip(buf), "NULL")) { 2041 /* 2042 * core_alua_get_tg_pt_gp_by_name() will increment reference to 2043 * struct t10_alua_tg_pt_gp. This reference is released with 2044 * core_alua_put_tg_pt_gp_from_name() below. 2045 */ 2046 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 2047 strstrip(buf)); 2048 if (!tg_pt_gp_new) 2049 return -ENODEV; 2050 } 2051 2052 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2053 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 2054 if (tg_pt_gp) { 2055 /* 2056 * Clearing an existing tg_pt_gp association, and replacing 2057 * with the default_tg_pt_gp. 2058 */ 2059 if (!tg_pt_gp_new) { 2060 pr_debug("Target_Core_ConfigFS: Moving" 2061 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2062 " alua/%s, ID: %hu back to" 2063 " default_tg_pt_gp\n", 2064 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2065 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2066 config_item_name(&lun->lun_group.cg_item), 2067 config_item_name( 2068 &tg_pt_gp->tg_pt_gp_group.cg_item), 2069 tg_pt_gp->tg_pt_gp_id); 2070 2071 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2072 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 2073 dev->t10_alua.default_tg_pt_gp); 2074 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2075 2076 return count; 2077 } 2078 /* 2079 * Removing existing association of tg_pt_gp_mem with tg_pt_gp 2080 */ 2081 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2082 move = 1; 2083 } 2084 /* 2085 * Associate tg_pt_gp_mem with tg_pt_gp_new. 2086 */ 2087 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); 2088 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2089 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2090 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2091 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2092 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2093 config_item_name(&lun->lun_group.cg_item), 2094 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2095 tg_pt_gp_new->tg_pt_gp_id); 2096 2097 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2098 return count; 2099 } 2100 2101 ssize_t core_alua_show_access_type( 2102 struct t10_alua_tg_pt_gp *tg_pt_gp, 2103 char *page) 2104 { 2105 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2106 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2107 return sprintf(page, "Implicit and Explicit\n"); 2108 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2109 return sprintf(page, "Implicit\n"); 2110 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2111 return sprintf(page, "Explicit\n"); 2112 else 2113 return sprintf(page, "None\n"); 2114 } 2115 2116 ssize_t core_alua_store_access_type( 2117 struct t10_alua_tg_pt_gp *tg_pt_gp, 2118 const char *page, 2119 size_t count) 2120 { 2121 unsigned long tmp; 2122 int ret; 2123 2124 ret = kstrtoul(page, 0, &tmp); 2125 if (ret < 0) { 2126 pr_err("Unable to extract alua_access_type\n"); 2127 return ret; 2128 } 2129 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2130 pr_err("Illegal value for alua_access_type:" 2131 " %lu\n", tmp); 2132 return -EINVAL; 2133 } 2134 if (tmp == 3) 2135 tg_pt_gp->tg_pt_gp_alua_access_type = 2136 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2137 else if (tmp == 2) 2138 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2139 else if (tmp == 1) 2140 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2141 else 2142 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2143 2144 return count; 2145 } 2146 2147 ssize_t core_alua_show_nonop_delay_msecs( 2148 struct t10_alua_tg_pt_gp *tg_pt_gp, 2149 char *page) 2150 { 2151 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2152 } 2153 2154 ssize_t core_alua_store_nonop_delay_msecs( 2155 struct t10_alua_tg_pt_gp *tg_pt_gp, 2156 const char *page, 2157 size_t count) 2158 { 2159 unsigned long tmp; 2160 int ret; 2161 2162 ret = kstrtoul(page, 0, &tmp); 2163 if (ret < 0) { 2164 pr_err("Unable to extract nonop_delay_msecs\n"); 2165 return ret; 2166 } 2167 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2168 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2169 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2170 ALUA_MAX_NONOP_DELAY_MSECS); 2171 return -EINVAL; 2172 } 2173 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2174 2175 return count; 2176 } 2177 2178 ssize_t core_alua_show_trans_delay_msecs( 2179 struct t10_alua_tg_pt_gp *tg_pt_gp, 2180 char *page) 2181 { 2182 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2183 } 2184 2185 ssize_t core_alua_store_trans_delay_msecs( 2186 struct t10_alua_tg_pt_gp *tg_pt_gp, 2187 const char *page, 2188 size_t count) 2189 { 2190 unsigned long tmp; 2191 int ret; 2192 2193 ret = kstrtoul(page, 0, &tmp); 2194 if (ret < 0) { 2195 pr_err("Unable to extract trans_delay_msecs\n"); 2196 return ret; 2197 } 2198 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2199 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2200 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2201 ALUA_MAX_TRANS_DELAY_MSECS); 2202 return -EINVAL; 2203 } 2204 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2205 2206 return count; 2207 } 2208 2209 ssize_t core_alua_show_implicit_trans_secs( 2210 struct t10_alua_tg_pt_gp *tg_pt_gp, 2211 char *page) 2212 { 2213 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2214 } 2215 2216 ssize_t core_alua_store_implicit_trans_secs( 2217 struct t10_alua_tg_pt_gp *tg_pt_gp, 2218 const char *page, 2219 size_t count) 2220 { 2221 unsigned long tmp; 2222 int ret; 2223 2224 ret = kstrtoul(page, 0, &tmp); 2225 if (ret < 0) { 2226 pr_err("Unable to extract implicit_trans_secs\n"); 2227 return ret; 2228 } 2229 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2230 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2231 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2232 ALUA_MAX_IMPLICIT_TRANS_SECS); 2233 return -EINVAL; 2234 } 2235 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2236 2237 return count; 2238 } 2239 2240 ssize_t core_alua_show_preferred_bit( 2241 struct t10_alua_tg_pt_gp *tg_pt_gp, 2242 char *page) 2243 { 2244 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2245 } 2246 2247 ssize_t core_alua_store_preferred_bit( 2248 struct t10_alua_tg_pt_gp *tg_pt_gp, 2249 const char *page, 2250 size_t count) 2251 { 2252 unsigned long tmp; 2253 int ret; 2254 2255 ret = kstrtoul(page, 0, &tmp); 2256 if (ret < 0) { 2257 pr_err("Unable to extract preferred ALUA value\n"); 2258 return ret; 2259 } 2260 if ((tmp != 0) && (tmp != 1)) { 2261 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2262 return -EINVAL; 2263 } 2264 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2265 2266 return count; 2267 } 2268 2269 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2270 { 2271 if (!lun->lun_sep) 2272 return -ENODEV; 2273 2274 return sprintf(page, "%d\n", 2275 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); 2276 } 2277 2278 ssize_t core_alua_store_offline_bit( 2279 struct se_lun *lun, 2280 const char *page, 2281 size_t count) 2282 { 2283 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2284 unsigned long tmp; 2285 int ret; 2286 2287 if (!lun->lun_sep) 2288 return -ENODEV; 2289 2290 ret = kstrtoul(page, 0, &tmp); 2291 if (ret < 0) { 2292 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2293 return ret; 2294 } 2295 if ((tmp != 0) && (tmp != 1)) { 2296 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2297 tmp); 2298 return -EINVAL; 2299 } 2300 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; 2301 if (!tg_pt_gp_mem) { 2302 pr_err("Unable to locate *tg_pt_gp_mem\n"); 2303 return -EINVAL; 2304 } 2305 2306 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, 2307 lun->lun_sep, 0, (int)tmp); 2308 if (ret < 0) 2309 return -EINVAL; 2310 2311 return count; 2312 } 2313 2314 ssize_t core_alua_show_secondary_status( 2315 struct se_lun *lun, 2316 char *page) 2317 { 2318 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); 2319 } 2320 2321 ssize_t core_alua_store_secondary_status( 2322 struct se_lun *lun, 2323 const char *page, 2324 size_t count) 2325 { 2326 unsigned long tmp; 2327 int ret; 2328 2329 ret = kstrtoul(page, 0, &tmp); 2330 if (ret < 0) { 2331 pr_err("Unable to extract alua_tg_pt_status\n"); 2332 return ret; 2333 } 2334 if ((tmp != ALUA_STATUS_NONE) && 2335 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2336 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2337 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2338 tmp); 2339 return -EINVAL; 2340 } 2341 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; 2342 2343 return count; 2344 } 2345 2346 ssize_t core_alua_show_secondary_write_metadata( 2347 struct se_lun *lun, 2348 char *page) 2349 { 2350 return sprintf(page, "%d\n", 2351 lun->lun_sep->sep_tg_pt_secondary_write_md); 2352 } 2353 2354 ssize_t core_alua_store_secondary_write_metadata( 2355 struct se_lun *lun, 2356 const char *page, 2357 size_t count) 2358 { 2359 unsigned long tmp; 2360 int ret; 2361 2362 ret = kstrtoul(page, 0, &tmp); 2363 if (ret < 0) { 2364 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2365 return ret; 2366 } 2367 if ((tmp != 0) && (tmp != 1)) { 2368 pr_err("Illegal value for alua_tg_pt_write_md:" 2369 " %lu\n", tmp); 2370 return -EINVAL; 2371 } 2372 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; 2373 2374 return count; 2375 } 2376 2377 int core_setup_alua(struct se_device *dev) 2378 { 2379 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && 2380 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2381 struct t10_alua_lu_gp_member *lu_gp_mem; 2382 2383 /* 2384 * Associate this struct se_device with the default ALUA 2385 * LUN Group. 2386 */ 2387 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2388 if (IS_ERR(lu_gp_mem)) 2389 return PTR_ERR(lu_gp_mem); 2390 2391 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2392 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2393 default_lu_gp); 2394 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2395 2396 pr_debug("%s: Adding to default ALUA LU Group:" 2397 " core/alua/lu_gps/default_lu_gp\n", 2398 dev->transport->name); 2399 } 2400 2401 return 0; 2402 } 2403