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 44 static sense_reason_t core_alua_check_transition(int state, int valid, 45 int *primary); 46 static 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 50 static char *core_alua_dump_state(int state); 51 52 static u16 alua_lu_gps_counter; 53 static u32 alua_lu_gps_count; 54 55 static DEFINE_SPINLOCK(lu_gps_lock); 56 static LIST_HEAD(lu_gps_list); 57 58 struct t10_alua_lu_gp *default_lu_gp; 59 60 /* 61 * REPORT REFERRALS 62 * 63 * See sbc3r35 section 5.23 64 */ 65 sense_reason_t 66 target_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 */ 145 sense_reason_t 146 target_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 */ 284 sense_reason_t 285 target_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(&tg_pt_gp->tg_pt_gp_ref_cnt); 396 smp_mb__after_atomic_inc(); 397 398 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 399 400 if (!core_alua_do_port_transition(tg_pt_gp, 401 dev, l_port, nacl, 402 alua_access_state, 1)) 403 found = true; 404 405 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 406 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 407 smp_mb__after_atomic_dec(); 408 break; 409 } 410 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 411 } else { 412 /* 413 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify 414 * the Target Port in question for the the incoming 415 * SET_TARGET_PORT_GROUPS op. 416 */ 417 rtpi = get_unaligned_be16(ptr + 2); 418 /* 419 * Locate the matching relative target port identifier 420 * for the struct se_device storage object. 421 */ 422 spin_lock(&dev->se_port_lock); 423 list_for_each_entry(port, &dev->dev_sep_list, 424 sep_list) { 425 if (port->sep_rtpi != rtpi) 426 continue; 427 428 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 429 430 spin_unlock(&dev->se_port_lock); 431 432 if (!core_alua_set_tg_pt_secondary_state( 433 tg_pt_gp_mem, port, 1, 1)) 434 found = true; 435 436 spin_lock(&dev->se_port_lock); 437 break; 438 } 439 spin_unlock(&dev->se_port_lock); 440 } 441 442 if (!found) { 443 rc = TCM_INVALID_PARAMETER_LIST; 444 goto out; 445 } 446 447 ptr += 4; 448 len += 4; 449 } 450 451 out: 452 transport_kunmap_data_sg(cmd); 453 if (!rc) 454 target_complete_cmd(cmd, GOOD); 455 return rc; 456 } 457 458 static inline int core_alua_state_nonoptimized( 459 struct se_cmd *cmd, 460 unsigned char *cdb, 461 int nonop_delay_msecs, 462 u8 *alua_ascq) 463 { 464 /* 465 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 466 * later to determine if processing of this cmd needs to be 467 * temporarily delayed for the Active/NonOptimized primary access state. 468 */ 469 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 470 cmd->alua_nonop_delay = nonop_delay_msecs; 471 return 0; 472 } 473 474 static inline int core_alua_state_lba_dependent( 475 struct se_cmd *cmd, 476 struct t10_alua_tg_pt_gp *tg_pt_gp, 477 u8 *alua_ascq) 478 { 479 struct se_device *dev = cmd->se_dev; 480 u64 segment_size, segment_mult, sectors, lba; 481 482 /* Only need to check for cdb actually containing LBAs */ 483 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB)) 484 return 0; 485 486 spin_lock(&dev->t10_alua.lba_map_lock); 487 segment_size = dev->t10_alua.lba_map_segment_size; 488 segment_mult = dev->t10_alua.lba_map_segment_multiplier; 489 sectors = cmd->data_length / dev->dev_attrib.block_size; 490 491 lba = cmd->t_task_lba; 492 while (lba < cmd->t_task_lba + sectors) { 493 struct t10_alua_lba_map *cur_map = NULL, *map; 494 struct t10_alua_lba_map_member *map_mem; 495 496 list_for_each_entry(map, &dev->t10_alua.lba_map_list, 497 lba_map_list) { 498 u64 start_lba, last_lba; 499 u64 first_lba = map->lba_map_first_lba; 500 501 if (segment_mult) { 502 u64 tmp = lba; 503 start_lba = do_div(tmp, segment_size * segment_mult); 504 505 last_lba = first_lba + segment_size - 1; 506 if (start_lba >= first_lba && 507 start_lba <= last_lba) { 508 lba += segment_size; 509 cur_map = map; 510 break; 511 } 512 } else { 513 last_lba = map->lba_map_last_lba; 514 if (lba >= first_lba && lba <= last_lba) { 515 lba = last_lba + 1; 516 cur_map = map; 517 break; 518 } 519 } 520 } 521 if (!cur_map) { 522 spin_unlock(&dev->t10_alua.lba_map_lock); 523 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 524 return 1; 525 } 526 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list, 527 lba_map_mem_list) { 528 if (map_mem->lba_map_mem_alua_pg_id != 529 tg_pt_gp->tg_pt_gp_id) 530 continue; 531 switch(map_mem->lba_map_mem_alua_state) { 532 case ALUA_ACCESS_STATE_STANDBY: 533 spin_unlock(&dev->t10_alua.lba_map_lock); 534 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 535 return 1; 536 case ALUA_ACCESS_STATE_UNAVAILABLE: 537 spin_unlock(&dev->t10_alua.lba_map_lock); 538 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 539 return 1; 540 default: 541 break; 542 } 543 } 544 } 545 spin_unlock(&dev->t10_alua.lba_map_lock); 546 return 0; 547 } 548 549 static inline int core_alua_state_standby( 550 struct se_cmd *cmd, 551 unsigned char *cdb, 552 u8 *alua_ascq) 553 { 554 /* 555 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 556 * spc4r17 section 5.9.2.4.4 557 */ 558 switch (cdb[0]) { 559 case INQUIRY: 560 case LOG_SELECT: 561 case LOG_SENSE: 562 case MODE_SELECT: 563 case MODE_SENSE: 564 case REPORT_LUNS: 565 case RECEIVE_DIAGNOSTIC: 566 case SEND_DIAGNOSTIC: 567 return 0; 568 case MAINTENANCE_IN: 569 switch (cdb[1] & 0x1f) { 570 case MI_REPORT_TARGET_PGS: 571 return 0; 572 default: 573 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 574 return 1; 575 } 576 case MAINTENANCE_OUT: 577 switch (cdb[1]) { 578 case MO_SET_TARGET_PGS: 579 return 0; 580 default: 581 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 582 return 1; 583 } 584 case REQUEST_SENSE: 585 case PERSISTENT_RESERVE_IN: 586 case PERSISTENT_RESERVE_OUT: 587 case READ_BUFFER: 588 case WRITE_BUFFER: 589 return 0; 590 default: 591 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 592 return 1; 593 } 594 595 return 0; 596 } 597 598 static inline int core_alua_state_unavailable( 599 struct se_cmd *cmd, 600 unsigned char *cdb, 601 u8 *alua_ascq) 602 { 603 /* 604 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 605 * spc4r17 section 5.9.2.4.5 606 */ 607 switch (cdb[0]) { 608 case INQUIRY: 609 case REPORT_LUNS: 610 return 0; 611 case MAINTENANCE_IN: 612 switch (cdb[1] & 0x1f) { 613 case MI_REPORT_TARGET_PGS: 614 return 0; 615 default: 616 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 617 return 1; 618 } 619 case MAINTENANCE_OUT: 620 switch (cdb[1]) { 621 case MO_SET_TARGET_PGS: 622 return 0; 623 default: 624 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 625 return 1; 626 } 627 case REQUEST_SENSE: 628 case READ_BUFFER: 629 case WRITE_BUFFER: 630 return 0; 631 default: 632 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 633 return 1; 634 } 635 636 return 0; 637 } 638 639 static inline int core_alua_state_transition( 640 struct se_cmd *cmd, 641 unsigned char *cdb, 642 u8 *alua_ascq) 643 { 644 /* 645 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by 646 * spc4r17 section 5.9.2.5 647 */ 648 switch (cdb[0]) { 649 case INQUIRY: 650 case REPORT_LUNS: 651 return 0; 652 case MAINTENANCE_IN: 653 switch (cdb[1] & 0x1f) { 654 case MI_REPORT_TARGET_PGS: 655 return 0; 656 default: 657 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 658 return 1; 659 } 660 case REQUEST_SENSE: 661 case READ_BUFFER: 662 case WRITE_BUFFER: 663 return 0; 664 default: 665 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 666 return 1; 667 } 668 669 return 0; 670 } 671 672 /* 673 * return 1: Is used to signal LUN not accessible, and check condition/not ready 674 * return 0: Used to signal success 675 * return -1: Used to signal failure, and invalid cdb field 676 */ 677 sense_reason_t 678 target_alua_state_check(struct se_cmd *cmd) 679 { 680 struct se_device *dev = cmd->se_dev; 681 unsigned char *cdb = cmd->t_task_cdb; 682 struct se_lun *lun = cmd->se_lun; 683 struct se_port *port = lun->lun_sep; 684 struct t10_alua_tg_pt_gp *tg_pt_gp; 685 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 686 int out_alua_state, nonop_delay_msecs; 687 u8 alua_ascq; 688 int ret; 689 690 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 691 return 0; 692 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 693 return 0; 694 695 if (!port) 696 return 0; 697 /* 698 * First, check for a struct se_port specific secondary ALUA target port 699 * access state: OFFLINE 700 */ 701 if (atomic_read(&port->sep_tg_pt_secondary_offline)) { 702 pr_debug("ALUA: Got secondary offline status for local" 703 " target port\n"); 704 alua_ascq = ASCQ_04H_ALUA_OFFLINE; 705 ret = 1; 706 goto out; 707 } 708 /* 709 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the 710 * ALUA target port group, to obtain current ALUA access state. 711 * Otherwise look for the underlying struct se_device association with 712 * a ALUA logical unit group. 713 */ 714 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 715 if (!tg_pt_gp_mem) 716 return 0; 717 718 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 719 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 720 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 721 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 722 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 723 /* 724 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional 725 * statement so the compiler knows explicitly to check this case first. 726 * For the Optimized ALUA access state case, we want to process the 727 * incoming fabric cmd ASAP.. 728 */ 729 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED) 730 return 0; 731 732 switch (out_alua_state) { 733 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 734 ret = core_alua_state_nonoptimized(cmd, cdb, 735 nonop_delay_msecs, &alua_ascq); 736 break; 737 case ALUA_ACCESS_STATE_STANDBY: 738 ret = core_alua_state_standby(cmd, cdb, &alua_ascq); 739 break; 740 case ALUA_ACCESS_STATE_UNAVAILABLE: 741 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); 742 break; 743 case ALUA_ACCESS_STATE_TRANSITION: 744 ret = core_alua_state_transition(cmd, cdb, &alua_ascq); 745 break; 746 case ALUA_ACCESS_STATE_LBA_DEPENDENT: 747 ret = core_alua_state_lba_dependent(cmd, tg_pt_gp, &alua_ascq); 748 break; 749 /* 750 * OFFLINE is a secondary ALUA target port group access state, that is 751 * handled above with struct se_port->sep_tg_pt_secondary_offline=1 752 */ 753 case ALUA_ACCESS_STATE_OFFLINE: 754 default: 755 pr_err("Unknown ALUA access state: 0x%02x\n", 756 out_alua_state); 757 return TCM_INVALID_CDB_FIELD; 758 } 759 760 out: 761 if (ret > 0) { 762 /* 763 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 764 * The ALUA additional sense code qualifier (ASCQ) is determined 765 * by the ALUA primary or secondary access state.. 766 */ 767 pr_debug("[%s]: ALUA TG Port not available, " 768 "SenseKey: NOT_READY, ASC/ASCQ: " 769 "0x04/0x%02x\n", 770 cmd->se_tfo->get_fabric_name(), alua_ascq); 771 772 cmd->scsi_asc = 0x04; 773 cmd->scsi_ascq = alua_ascq; 774 return TCM_CHECK_CONDITION_NOT_READY; 775 } 776 777 return 0; 778 } 779 780 /* 781 * Check implicit and explicit ALUA state change request. 782 */ 783 static sense_reason_t 784 core_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; 837 838 not_supported: 839 pr_err("ALUA access state %s not supported", 840 core_alua_dump_state(state)); 841 return TCM_INVALID_PARAMETER_LIST; 842 } 843 844 static 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 } 867 868 char *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 */ 888 int 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 } 908 EXPORT_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 */ 914 static 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 */ 936 static 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 } 968 969 static 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(&mem->tg_pt_gp_mem_ref_cnt); 1000 smp_mb__after_atomic_inc(); 1001 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1002 1003 spin_lock_bh(&port->sep_alua_lock); 1004 list_for_each_entry(se_deve, &port->sep_alua_list, 1005 alua_port_list) { 1006 lacl = se_deve->se_lun_acl; 1007 /* 1008 * se_deve->se_lun_acl pointer may be NULL for a 1009 * entry created without explicit Node+MappedLUN ACLs 1010 */ 1011 if (!lacl) 1012 continue; 1013 1014 if ((tg_pt_gp->tg_pt_gp_alua_access_status == 1015 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 1016 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && 1017 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) && 1018 (tg_pt_gp->tg_pt_gp_alua_port != NULL) && 1019 (tg_pt_gp->tg_pt_gp_alua_port == port)) 1020 continue; 1021 1022 core_scsi3_ua_allocate(lacl->se_lun_nacl, 1023 se_deve->mapped_lun, 0x2A, 1024 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 1025 } 1026 spin_unlock_bh(&port->sep_alua_lock); 1027 1028 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1029 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); 1030 smp_mb__after_atomic_dec(); 1031 } 1032 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1033 /* 1034 * Update the ALUA metadata buf that has been allocated in 1035 * core_alua_do_port_transition(), this metadata will be written 1036 * to struct file. 1037 * 1038 * Note that there is the case where we do not want to update the 1039 * metadata when the saved metadata is being parsed in userspace 1040 * when setting the existing port access state and access status. 1041 * 1042 * Also note that the failure to write out the ALUA metadata to 1043 * struct file does NOT affect the actual ALUA transition. 1044 */ 1045 if (tg_pt_gp->tg_pt_gp_write_metadata) { 1046 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 1047 core_alua_update_tpg_primary_metadata(tg_pt_gp); 1048 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 1049 } 1050 /* 1051 * Set the current primary ALUA access state to the requested new state 1052 */ 1053 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1054 tg_pt_gp->tg_pt_gp_alua_pending_state); 1055 1056 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1057 " from primary access state %s to %s\n", (explicit) ? "explicit" : 1058 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1059 tg_pt_gp->tg_pt_gp_id, 1060 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state), 1061 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); 1062 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1063 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1064 smp_mb__after_atomic_dec(); 1065 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1066 1067 if (tg_pt_gp->tg_pt_gp_transition_complete) 1068 complete(tg_pt_gp->tg_pt_gp_transition_complete); 1069 } 1070 1071 static int core_alua_do_transition_tg_pt( 1072 struct t10_alua_tg_pt_gp *tg_pt_gp, 1073 int new_state, 1074 int explicit) 1075 { 1076 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1077 DECLARE_COMPLETION_ONSTACK(wait); 1078 1079 /* Nothing to be done here */ 1080 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) 1081 return 0; 1082 1083 if (new_state == ALUA_ACCESS_STATE_TRANSITION) 1084 return -EAGAIN; 1085 1086 /* 1087 * Flush any pending transitions 1088 */ 1089 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && 1090 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == 1091 ALUA_ACCESS_STATE_TRANSITION) { 1092 /* Just in case */ 1093 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1094 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1095 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1096 wait_for_completion(&wait); 1097 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1098 return 0; 1099 } 1100 1101 /* 1102 * Save the old primary ALUA access state, and set the current state 1103 * to ALUA_ACCESS_STATE_TRANSITION. 1104 */ 1105 tg_pt_gp->tg_pt_gp_alua_previous_state = 1106 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 1107 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; 1108 1109 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1110 ALUA_ACCESS_STATE_TRANSITION); 1111 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? 1112 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1113 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1114 1115 /* 1116 * Check for the optional ALUA primary state transition delay 1117 */ 1118 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 1119 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1120 1121 /* 1122 * Take a reference for workqueue item 1123 */ 1124 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1125 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1126 smp_mb__after_atomic_inc(); 1127 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1128 1129 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { 1130 unsigned long transition_tmo; 1131 1132 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; 1133 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1134 &tg_pt_gp->tg_pt_gp_transition_work, 1135 transition_tmo); 1136 } else { 1137 tg_pt_gp->tg_pt_gp_transition_complete = &wait; 1138 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, 1139 &tg_pt_gp->tg_pt_gp_transition_work, 0); 1140 wait_for_completion(&wait); 1141 tg_pt_gp->tg_pt_gp_transition_complete = NULL; 1142 } 1143 1144 return 0; 1145 } 1146 1147 int core_alua_do_port_transition( 1148 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 1149 struct se_device *l_dev, 1150 struct se_port *l_port, 1151 struct se_node_acl *l_nacl, 1152 int new_state, 1153 int explicit) 1154 { 1155 struct se_device *dev; 1156 struct t10_alua_lu_gp *lu_gp; 1157 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 1158 struct t10_alua_tg_pt_gp *tg_pt_gp; 1159 int primary, valid_states, rc = 0; 1160 1161 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; 1162 if (core_alua_check_transition(new_state, valid_states, &primary) != 0) 1163 return -EINVAL; 1164 1165 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 1166 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 1167 lu_gp = local_lu_gp_mem->lu_gp; 1168 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1169 smp_mb__after_atomic_inc(); 1170 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 1171 /* 1172 * For storage objects that are members of the 'default_lu_gp', 1173 * we only do transition on the passed *l_tp_pt_gp, and not 1174 * on all of the matching target port groups IDs in default_lu_gp. 1175 */ 1176 if (!lu_gp->lu_gp_id) { 1177 /* 1178 * core_alua_do_transition_tg_pt() will always return 1179 * success. 1180 */ 1181 l_tg_pt_gp->tg_pt_gp_alua_port = l_port; 1182 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1183 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, 1184 new_state, explicit); 1185 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1186 smp_mb__after_atomic_dec(); 1187 return rc; 1188 } 1189 /* 1190 * For all other LU groups aside from 'default_lu_gp', walk all of 1191 * the associated storage objects looking for a matching target port 1192 * group ID from the local target port group. 1193 */ 1194 spin_lock(&lu_gp->lu_gp_lock); 1195 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 1196 lu_gp_mem_list) { 1197 1198 dev = lu_gp_mem->lu_gp_mem_dev; 1199 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); 1200 smp_mb__after_atomic_inc(); 1201 spin_unlock(&lu_gp->lu_gp_lock); 1202 1203 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1204 list_for_each_entry(tg_pt_gp, 1205 &dev->t10_alua.tg_pt_gps_list, 1206 tg_pt_gp_list) { 1207 1208 if (!tg_pt_gp->tg_pt_gp_valid_id) 1209 continue; 1210 /* 1211 * If the target behavior port asymmetric access state 1212 * is changed for any target port group accessible via 1213 * a logical unit within a LU group, the target port 1214 * behavior group asymmetric access states for the same 1215 * target port group accessible via other logical units 1216 * in that LU group will also change. 1217 */ 1218 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 1219 continue; 1220 1221 if (l_tg_pt_gp == tg_pt_gp) { 1222 tg_pt_gp->tg_pt_gp_alua_port = l_port; 1223 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; 1224 } else { 1225 tg_pt_gp->tg_pt_gp_alua_port = NULL; 1226 tg_pt_gp->tg_pt_gp_alua_nacl = NULL; 1227 } 1228 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1229 smp_mb__after_atomic_inc(); 1230 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1231 /* 1232 * core_alua_do_transition_tg_pt() will always return 1233 * success. 1234 */ 1235 rc = core_alua_do_transition_tg_pt(tg_pt_gp, 1236 new_state, explicit); 1237 1238 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1239 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1240 smp_mb__after_atomic_dec(); 1241 if (rc) 1242 break; 1243 } 1244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1245 1246 spin_lock(&lu_gp->lu_gp_lock); 1247 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); 1248 smp_mb__after_atomic_dec(); 1249 } 1250 spin_unlock(&lu_gp->lu_gp_lock); 1251 1252 if (!rc) { 1253 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 1254 " Group IDs: %hu %s transition to primary state: %s\n", 1255 config_item_name(&lu_gp->lu_gp_group.cg_item), 1256 l_tg_pt_gp->tg_pt_gp_id, 1257 (explicit) ? "explicit" : "implicit", 1258 core_alua_dump_state(new_state)); 1259 } 1260 1261 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1262 smp_mb__after_atomic_dec(); 1263 return rc; 1264 } 1265 1266 /* 1267 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held 1268 */ 1269 static int core_alua_update_tpg_secondary_metadata( 1270 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1271 struct se_port *port) 1272 { 1273 unsigned char *md_buf; 1274 struct se_portal_group *se_tpg = port->sep_tpg; 1275 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1276 int len, rc; 1277 1278 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); 1279 if (!md_buf) { 1280 pr_err("Unable to allocate buf for ALUA metadata\n"); 1281 return -ENOMEM; 1282 } 1283 1284 memset(path, 0, ALUA_METADATA_PATH_LEN); 1285 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1286 1287 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1288 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1289 1290 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1291 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1292 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1293 1294 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" 1295 "alua_tg_pt_status=0x%02x\n", 1296 atomic_read(&port->sep_tg_pt_secondary_offline), 1297 port->sep_tg_pt_secondary_stat); 1298 1299 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", 1300 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1301 port->sep_lun->unpacked_lun); 1302 1303 rc = core_alua_write_tpg_metadata(path, md_buf, len); 1304 kfree(md_buf); 1305 1306 return rc; 1307 } 1308 1309 static int core_alua_set_tg_pt_secondary_state( 1310 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1311 struct se_port *port, 1312 int explicit, 1313 int offline) 1314 { 1315 struct t10_alua_tg_pt_gp *tg_pt_gp; 1316 int trans_delay_msecs; 1317 1318 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1319 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1320 if (!tg_pt_gp) { 1321 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1322 pr_err("Unable to complete secondary state" 1323 " transition\n"); 1324 return -EINVAL; 1325 } 1326 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1327 /* 1328 * Set the secondary ALUA target port access state to OFFLINE 1329 * or release the previously secondary state for struct se_port 1330 */ 1331 if (offline) 1332 atomic_set(&port->sep_tg_pt_secondary_offline, 1); 1333 else 1334 atomic_set(&port->sep_tg_pt_secondary_offline, 0); 1335 1336 port->sep_tg_pt_secondary_stat = (explicit) ? 1337 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : 1338 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; 1339 1340 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1341 " to secondary access state: %s\n", (explicit) ? "explicit" : 1342 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1343 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1344 1345 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1346 /* 1347 * Do the optional transition delay after we set the secondary 1348 * ALUA access state. 1349 */ 1350 if (trans_delay_msecs != 0) 1351 msleep_interruptible(trans_delay_msecs); 1352 /* 1353 * See if we need to update the ALUA fabric port metadata for 1354 * secondary state and status 1355 */ 1356 if (port->sep_tg_pt_secondary_write_md) { 1357 mutex_lock(&port->sep_tg_pt_md_mutex); 1358 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port); 1359 mutex_unlock(&port->sep_tg_pt_md_mutex); 1360 } 1361 1362 return 0; 1363 } 1364 1365 struct t10_alua_lba_map * 1366 core_alua_allocate_lba_map(struct list_head *list, 1367 u64 first_lba, u64 last_lba) 1368 { 1369 struct t10_alua_lba_map *lba_map; 1370 1371 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); 1372 if (!lba_map) { 1373 pr_err("Unable to allocate struct t10_alua_lba_map\n"); 1374 return ERR_PTR(-ENOMEM); 1375 } 1376 INIT_LIST_HEAD(&lba_map->lba_map_mem_list); 1377 lba_map->lba_map_first_lba = first_lba; 1378 lba_map->lba_map_last_lba = last_lba; 1379 1380 list_add_tail(&lba_map->lba_map_list, list); 1381 return lba_map; 1382 } 1383 1384 int 1385 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, 1386 int pg_id, int state) 1387 { 1388 struct t10_alua_lba_map_member *lba_map_mem; 1389 1390 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, 1391 lba_map_mem_list) { 1392 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { 1393 pr_err("Duplicate pg_id %d in lba_map\n", pg_id); 1394 return -EINVAL; 1395 } 1396 } 1397 1398 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); 1399 if (!lba_map_mem) { 1400 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); 1401 return -ENOMEM; 1402 } 1403 lba_map_mem->lba_map_mem_alua_state = state; 1404 lba_map_mem->lba_map_mem_alua_pg_id = pg_id; 1405 1406 list_add_tail(&lba_map_mem->lba_map_mem_list, 1407 &lba_map->lba_map_mem_list); 1408 return 0; 1409 } 1410 1411 void 1412 core_alua_free_lba_map(struct list_head *lba_list) 1413 { 1414 struct t10_alua_lba_map *lba_map, *lba_map_tmp; 1415 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; 1416 1417 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, 1418 lba_map_list) { 1419 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, 1420 &lba_map->lba_map_mem_list, 1421 lba_map_mem_list) { 1422 list_del(&lba_map_mem->lba_map_mem_list); 1423 kmem_cache_free(t10_alua_lba_map_mem_cache, 1424 lba_map_mem); 1425 } 1426 list_del(&lba_map->lba_map_list); 1427 kmem_cache_free(t10_alua_lba_map_cache, lba_map); 1428 } 1429 } 1430 1431 void 1432 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, 1433 int segment_size, int segment_mult) 1434 { 1435 struct list_head old_lba_map_list; 1436 struct t10_alua_tg_pt_gp *tg_pt_gp; 1437 int activate = 0, supported; 1438 1439 INIT_LIST_HEAD(&old_lba_map_list); 1440 spin_lock(&dev->t10_alua.lba_map_lock); 1441 dev->t10_alua.lba_map_segment_size = segment_size; 1442 dev->t10_alua.lba_map_segment_multiplier = segment_mult; 1443 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); 1444 if (lba_map_list) { 1445 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); 1446 activate = 1; 1447 } 1448 spin_unlock(&dev->t10_alua.lba_map_lock); 1449 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1450 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1451 tg_pt_gp_list) { 1452 1453 if (!tg_pt_gp->tg_pt_gp_valid_id) 1454 continue; 1455 supported = tg_pt_gp->tg_pt_gp_alua_supported_states; 1456 if (activate) 1457 supported |= ALUA_LBD_SUP; 1458 else 1459 supported &= ~ALUA_LBD_SUP; 1460 tg_pt_gp->tg_pt_gp_alua_supported_states = supported; 1461 } 1462 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1463 core_alua_free_lba_map(&old_lba_map_list); 1464 } 1465 1466 struct t10_alua_lu_gp * 1467 core_alua_allocate_lu_gp(const char *name, int def_group) 1468 { 1469 struct t10_alua_lu_gp *lu_gp; 1470 1471 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1472 if (!lu_gp) { 1473 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1474 return ERR_PTR(-ENOMEM); 1475 } 1476 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1477 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1478 spin_lock_init(&lu_gp->lu_gp_lock); 1479 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1480 1481 if (def_group) { 1482 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1483 lu_gp->lu_gp_valid_id = 1; 1484 alua_lu_gps_count++; 1485 } 1486 1487 return lu_gp; 1488 } 1489 1490 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1491 { 1492 struct t10_alua_lu_gp *lu_gp_tmp; 1493 u16 lu_gp_id_tmp; 1494 /* 1495 * The lu_gp->lu_gp_id may only be set once.. 1496 */ 1497 if (lu_gp->lu_gp_valid_id) { 1498 pr_warn("ALUA LU Group already has a valid ID," 1499 " ignoring request\n"); 1500 return -EINVAL; 1501 } 1502 1503 spin_lock(&lu_gps_lock); 1504 if (alua_lu_gps_count == 0x0000ffff) { 1505 pr_err("Maximum ALUA alua_lu_gps_count:" 1506 " 0x0000ffff reached\n"); 1507 spin_unlock(&lu_gps_lock); 1508 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1509 return -ENOSPC; 1510 } 1511 again: 1512 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1513 alua_lu_gps_counter++; 1514 1515 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1516 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1517 if (!lu_gp_id) 1518 goto again; 1519 1520 pr_warn("ALUA Logical Unit Group ID: %hu" 1521 " already exists, ignoring request\n", 1522 lu_gp_id); 1523 spin_unlock(&lu_gps_lock); 1524 return -EINVAL; 1525 } 1526 } 1527 1528 lu_gp->lu_gp_id = lu_gp_id_tmp; 1529 lu_gp->lu_gp_valid_id = 1; 1530 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1531 alua_lu_gps_count++; 1532 spin_unlock(&lu_gps_lock); 1533 1534 return 0; 1535 } 1536 1537 static struct t10_alua_lu_gp_member * 1538 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1539 { 1540 struct t10_alua_lu_gp_member *lu_gp_mem; 1541 1542 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1543 if (!lu_gp_mem) { 1544 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1545 return ERR_PTR(-ENOMEM); 1546 } 1547 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1548 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1549 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1550 1551 lu_gp_mem->lu_gp_mem_dev = dev; 1552 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1553 1554 return lu_gp_mem; 1555 } 1556 1557 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1558 { 1559 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1560 /* 1561 * Once we have reached this point, config_item_put() has 1562 * already been called from target_core_alua_drop_lu_gp(). 1563 * 1564 * Here, we remove the *lu_gp from the global list so that 1565 * no associations can be made while we are releasing 1566 * struct t10_alua_lu_gp. 1567 */ 1568 spin_lock(&lu_gps_lock); 1569 list_del(&lu_gp->lu_gp_node); 1570 alua_lu_gps_count--; 1571 spin_unlock(&lu_gps_lock); 1572 /* 1573 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1574 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1575 * released with core_alua_put_lu_gp_from_name() 1576 */ 1577 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1578 cpu_relax(); 1579 /* 1580 * Release reference to struct t10_alua_lu_gp * from all associated 1581 * struct se_device. 1582 */ 1583 spin_lock(&lu_gp->lu_gp_lock); 1584 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1585 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1586 if (lu_gp_mem->lu_gp_assoc) { 1587 list_del(&lu_gp_mem->lu_gp_mem_list); 1588 lu_gp->lu_gp_members--; 1589 lu_gp_mem->lu_gp_assoc = 0; 1590 } 1591 spin_unlock(&lu_gp->lu_gp_lock); 1592 /* 1593 * 1594 * lu_gp_mem is associated with a single 1595 * struct se_device->dev_alua_lu_gp_mem, and is released when 1596 * struct se_device is released via core_alua_free_lu_gp_mem(). 1597 * 1598 * If the passed lu_gp does NOT match the default_lu_gp, assume 1599 * we want to re-associate a given lu_gp_mem with default_lu_gp. 1600 */ 1601 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1602 if (lu_gp != default_lu_gp) 1603 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1604 default_lu_gp); 1605 else 1606 lu_gp_mem->lu_gp = NULL; 1607 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1608 1609 spin_lock(&lu_gp->lu_gp_lock); 1610 } 1611 spin_unlock(&lu_gp->lu_gp_lock); 1612 1613 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1614 } 1615 1616 void core_alua_free_lu_gp_mem(struct se_device *dev) 1617 { 1618 struct t10_alua_lu_gp *lu_gp; 1619 struct t10_alua_lu_gp_member *lu_gp_mem; 1620 1621 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1622 if (!lu_gp_mem) 1623 return; 1624 1625 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1626 cpu_relax(); 1627 1628 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1629 lu_gp = lu_gp_mem->lu_gp; 1630 if (lu_gp) { 1631 spin_lock(&lu_gp->lu_gp_lock); 1632 if (lu_gp_mem->lu_gp_assoc) { 1633 list_del(&lu_gp_mem->lu_gp_mem_list); 1634 lu_gp->lu_gp_members--; 1635 lu_gp_mem->lu_gp_assoc = 0; 1636 } 1637 spin_unlock(&lu_gp->lu_gp_lock); 1638 lu_gp_mem->lu_gp = NULL; 1639 } 1640 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1641 1642 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1643 } 1644 1645 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1646 { 1647 struct t10_alua_lu_gp *lu_gp; 1648 struct config_item *ci; 1649 1650 spin_lock(&lu_gps_lock); 1651 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1652 if (!lu_gp->lu_gp_valid_id) 1653 continue; 1654 ci = &lu_gp->lu_gp_group.cg_item; 1655 if (!strcmp(config_item_name(ci), name)) { 1656 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1657 spin_unlock(&lu_gps_lock); 1658 return lu_gp; 1659 } 1660 } 1661 spin_unlock(&lu_gps_lock); 1662 1663 return NULL; 1664 } 1665 1666 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1667 { 1668 spin_lock(&lu_gps_lock); 1669 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1670 spin_unlock(&lu_gps_lock); 1671 } 1672 1673 /* 1674 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1675 */ 1676 void __core_alua_attach_lu_gp_mem( 1677 struct t10_alua_lu_gp_member *lu_gp_mem, 1678 struct t10_alua_lu_gp *lu_gp) 1679 { 1680 spin_lock(&lu_gp->lu_gp_lock); 1681 lu_gp_mem->lu_gp = lu_gp; 1682 lu_gp_mem->lu_gp_assoc = 1; 1683 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1684 lu_gp->lu_gp_members++; 1685 spin_unlock(&lu_gp->lu_gp_lock); 1686 } 1687 1688 /* 1689 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1690 */ 1691 void __core_alua_drop_lu_gp_mem( 1692 struct t10_alua_lu_gp_member *lu_gp_mem, 1693 struct t10_alua_lu_gp *lu_gp) 1694 { 1695 spin_lock(&lu_gp->lu_gp_lock); 1696 list_del(&lu_gp_mem->lu_gp_mem_list); 1697 lu_gp_mem->lu_gp = NULL; 1698 lu_gp_mem->lu_gp_assoc = 0; 1699 lu_gp->lu_gp_members--; 1700 spin_unlock(&lu_gp->lu_gp_lock); 1701 } 1702 1703 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1704 const char *name, int def_group) 1705 { 1706 struct t10_alua_tg_pt_gp *tg_pt_gp; 1707 1708 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1709 if (!tg_pt_gp) { 1710 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1711 return NULL; 1712 } 1713 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1714 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); 1715 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1716 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1717 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1718 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work, 1719 core_alua_do_transition_tg_pt_work); 1720 tg_pt_gp->tg_pt_gp_dev = dev; 1721 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1722 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED); 1723 /* 1724 * Enable both explicit and implicit ALUA support by default 1725 */ 1726 tg_pt_gp->tg_pt_gp_alua_access_type = 1727 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; 1728 /* 1729 * Set the default Active/NonOptimized Delay in milliseconds 1730 */ 1731 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1732 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1733 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; 1734 1735 /* 1736 * Enable all supported states 1737 */ 1738 tg_pt_gp->tg_pt_gp_alua_supported_states = 1739 ALUA_T_SUP | ALUA_O_SUP | 1740 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; 1741 1742 if (def_group) { 1743 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1744 tg_pt_gp->tg_pt_gp_id = 1745 dev->t10_alua.alua_tg_pt_gps_counter++; 1746 tg_pt_gp->tg_pt_gp_valid_id = 1; 1747 dev->t10_alua.alua_tg_pt_gps_count++; 1748 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1749 &dev->t10_alua.tg_pt_gps_list); 1750 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1751 } 1752 1753 return tg_pt_gp; 1754 } 1755 1756 int core_alua_set_tg_pt_gp_id( 1757 struct t10_alua_tg_pt_gp *tg_pt_gp, 1758 u16 tg_pt_gp_id) 1759 { 1760 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1761 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1762 u16 tg_pt_gp_id_tmp; 1763 1764 /* 1765 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1766 */ 1767 if (tg_pt_gp->tg_pt_gp_valid_id) { 1768 pr_warn("ALUA TG PT Group already has a valid ID," 1769 " ignoring request\n"); 1770 return -EINVAL; 1771 } 1772 1773 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1774 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1775 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1776 " 0x0000ffff reached\n"); 1777 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1778 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1779 return -ENOSPC; 1780 } 1781 again: 1782 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1783 dev->t10_alua.alua_tg_pt_gps_counter++; 1784 1785 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1786 tg_pt_gp_list) { 1787 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1788 if (!tg_pt_gp_id) 1789 goto again; 1790 1791 pr_err("ALUA Target Port Group ID: %hu already" 1792 " exists, ignoring request\n", tg_pt_gp_id); 1793 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1794 return -EINVAL; 1795 } 1796 } 1797 1798 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1799 tg_pt_gp->tg_pt_gp_valid_id = 1; 1800 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1801 &dev->t10_alua.tg_pt_gps_list); 1802 dev->t10_alua.alua_tg_pt_gps_count++; 1803 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1804 1805 return 0; 1806 } 1807 1808 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( 1809 struct se_port *port) 1810 { 1811 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1812 1813 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, 1814 GFP_KERNEL); 1815 if (!tg_pt_gp_mem) { 1816 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); 1817 return ERR_PTR(-ENOMEM); 1818 } 1819 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1820 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1821 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); 1822 1823 tg_pt_gp_mem->tg_pt = port; 1824 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; 1825 1826 return tg_pt_gp_mem; 1827 } 1828 1829 void core_alua_free_tg_pt_gp( 1830 struct t10_alua_tg_pt_gp *tg_pt_gp) 1831 { 1832 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1833 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; 1834 1835 /* 1836 * Once we have reached this point, config_item_put() has already 1837 * been called from target_core_alua_drop_tg_pt_gp(). 1838 * 1839 * Here we remove *tg_pt_gp from the global list so that 1840 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS 1841 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1842 */ 1843 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1844 list_del(&tg_pt_gp->tg_pt_gp_list); 1845 dev->t10_alua.alua_tg_pt_gps_counter--; 1846 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1847 1848 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); 1849 1850 /* 1851 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1852 * core_alua_get_tg_pt_gp_by_name() in 1853 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1854 * to be released with core_alua_put_tg_pt_gp_from_name(). 1855 */ 1856 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1857 cpu_relax(); 1858 1859 /* 1860 * Release reference to struct t10_alua_tg_pt_gp from all associated 1861 * struct se_port. 1862 */ 1863 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1864 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, 1865 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { 1866 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1867 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1868 tg_pt_gp->tg_pt_gp_members--; 1869 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1870 } 1871 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1872 /* 1873 * tg_pt_gp_mem is associated with a single 1874 * se_port->sep_alua_tg_pt_gp_mem, and is released via 1875 * core_alua_free_tg_pt_gp_mem(). 1876 * 1877 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1878 * assume we want to re-associate a given tg_pt_gp_mem with 1879 * default_tg_pt_gp. 1880 */ 1881 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1882 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1883 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1884 dev->t10_alua.default_tg_pt_gp); 1885 } else 1886 tg_pt_gp_mem->tg_pt_gp = NULL; 1887 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1888 1889 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1890 } 1891 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1892 1893 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1894 } 1895 1896 void core_alua_free_tg_pt_gp_mem(struct se_port *port) 1897 { 1898 struct t10_alua_tg_pt_gp *tg_pt_gp; 1899 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1900 1901 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1902 if (!tg_pt_gp_mem) 1903 return; 1904 1905 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) 1906 cpu_relax(); 1907 1908 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1909 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1910 if (tg_pt_gp) { 1911 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1912 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1913 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1914 tg_pt_gp->tg_pt_gp_members--; 1915 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1916 } 1917 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1918 tg_pt_gp_mem->tg_pt_gp = NULL; 1919 } 1920 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1921 1922 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); 1923 } 1924 1925 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1926 struct se_device *dev, const char *name) 1927 { 1928 struct t10_alua_tg_pt_gp *tg_pt_gp; 1929 struct config_item *ci; 1930 1931 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1932 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1933 tg_pt_gp_list) { 1934 if (!tg_pt_gp->tg_pt_gp_valid_id) 1935 continue; 1936 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1937 if (!strcmp(config_item_name(ci), name)) { 1938 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1939 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1940 return tg_pt_gp; 1941 } 1942 } 1943 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1944 1945 return NULL; 1946 } 1947 1948 static void core_alua_put_tg_pt_gp_from_name( 1949 struct t10_alua_tg_pt_gp *tg_pt_gp) 1950 { 1951 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1952 1953 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1954 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1955 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1956 } 1957 1958 /* 1959 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1960 */ 1961 void __core_alua_attach_tg_pt_gp_mem( 1962 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1963 struct t10_alua_tg_pt_gp *tg_pt_gp) 1964 { 1965 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1966 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; 1967 tg_pt_gp_mem->tg_pt_gp_assoc = 1; 1968 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, 1969 &tg_pt_gp->tg_pt_gp_mem_list); 1970 tg_pt_gp->tg_pt_gp_members++; 1971 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1972 } 1973 1974 /* 1975 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1976 */ 1977 static void __core_alua_drop_tg_pt_gp_mem( 1978 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1979 struct t10_alua_tg_pt_gp *tg_pt_gp) 1980 { 1981 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1982 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1983 tg_pt_gp_mem->tg_pt_gp = NULL; 1984 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1985 tg_pt_gp->tg_pt_gp_members--; 1986 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1987 } 1988 1989 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) 1990 { 1991 struct config_item *tg_pt_ci; 1992 struct t10_alua_tg_pt_gp *tg_pt_gp; 1993 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1994 ssize_t len = 0; 1995 1996 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1997 if (!tg_pt_gp_mem) 1998 return len; 1999 2000 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2001 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 2002 if (tg_pt_gp) { 2003 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 2004 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 2005 " %hu\nTG Port Primary Access State: %s\nTG Port " 2006 "Primary Access Status: %s\nTG Port Secondary Access" 2007 " State: %s\nTG Port Secondary Access Status: %s\n", 2008 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 2009 core_alua_dump_state(atomic_read( 2010 &tg_pt_gp->tg_pt_gp_alua_access_state)), 2011 core_alua_dump_status( 2012 tg_pt_gp->tg_pt_gp_alua_access_status), 2013 (atomic_read(&port->sep_tg_pt_secondary_offline)) ? 2014 "Offline" : "None", 2015 core_alua_dump_status(port->sep_tg_pt_secondary_stat)); 2016 } 2017 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2018 2019 return len; 2020 } 2021 2022 ssize_t core_alua_store_tg_pt_gp_info( 2023 struct se_port *port, 2024 const char *page, 2025 size_t count) 2026 { 2027 struct se_portal_group *tpg; 2028 struct se_lun *lun; 2029 struct se_device *dev = port->sep_lun->lun_se_dev; 2030 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 2031 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2032 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 2033 int move = 0; 2034 2035 tpg = port->sep_tpg; 2036 lun = port->sep_lun; 2037 2038 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 2039 if (!tg_pt_gp_mem) 2040 return 0; 2041 2042 if (count > TG_PT_GROUP_NAME_BUF) { 2043 pr_err("ALUA Target Port Group alias too large!\n"); 2044 return -EINVAL; 2045 } 2046 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 2047 memcpy(buf, page, count); 2048 /* 2049 * Any ALUA target port group alias besides "NULL" means we will be 2050 * making a new group association. 2051 */ 2052 if (strcmp(strstrip(buf), "NULL")) { 2053 /* 2054 * core_alua_get_tg_pt_gp_by_name() will increment reference to 2055 * struct t10_alua_tg_pt_gp. This reference is released with 2056 * core_alua_put_tg_pt_gp_from_name() below. 2057 */ 2058 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 2059 strstrip(buf)); 2060 if (!tg_pt_gp_new) 2061 return -ENODEV; 2062 } 2063 2064 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2065 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 2066 if (tg_pt_gp) { 2067 /* 2068 * Clearing an existing tg_pt_gp association, and replacing 2069 * with the default_tg_pt_gp. 2070 */ 2071 if (!tg_pt_gp_new) { 2072 pr_debug("Target_Core_ConfigFS: Moving" 2073 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 2074 " alua/%s, ID: %hu back to" 2075 " default_tg_pt_gp\n", 2076 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2077 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2078 config_item_name(&lun->lun_group.cg_item), 2079 config_item_name( 2080 &tg_pt_gp->tg_pt_gp_group.cg_item), 2081 tg_pt_gp->tg_pt_gp_id); 2082 2083 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2084 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 2085 dev->t10_alua.default_tg_pt_gp); 2086 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2087 2088 return count; 2089 } 2090 /* 2091 * Removing existing association of tg_pt_gp_mem with tg_pt_gp 2092 */ 2093 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 2094 move = 1; 2095 } 2096 /* 2097 * Associate tg_pt_gp_mem with tg_pt_gp_new. 2098 */ 2099 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); 2100 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 2101 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 2102 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 2103 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 2104 tpg->se_tpg_tfo->tpg_get_tag(tpg), 2105 config_item_name(&lun->lun_group.cg_item), 2106 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 2107 tg_pt_gp_new->tg_pt_gp_id); 2108 2109 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 2110 return count; 2111 } 2112 2113 ssize_t core_alua_show_access_type( 2114 struct t10_alua_tg_pt_gp *tg_pt_gp, 2115 char *page) 2116 { 2117 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) && 2118 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) 2119 return sprintf(page, "Implicit and Explicit\n"); 2120 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA) 2121 return sprintf(page, "Implicit\n"); 2122 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) 2123 return sprintf(page, "Explicit\n"); 2124 else 2125 return sprintf(page, "None\n"); 2126 } 2127 2128 ssize_t core_alua_store_access_type( 2129 struct t10_alua_tg_pt_gp *tg_pt_gp, 2130 const char *page, 2131 size_t count) 2132 { 2133 unsigned long tmp; 2134 int ret; 2135 2136 ret = kstrtoul(page, 0, &tmp); 2137 if (ret < 0) { 2138 pr_err("Unable to extract alua_access_type\n"); 2139 return ret; 2140 } 2141 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 2142 pr_err("Illegal value for alua_access_type:" 2143 " %lu\n", tmp); 2144 return -EINVAL; 2145 } 2146 if (tmp == 3) 2147 tg_pt_gp->tg_pt_gp_alua_access_type = 2148 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA; 2149 else if (tmp == 2) 2150 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA; 2151 else if (tmp == 1) 2152 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA; 2153 else 2154 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 2155 2156 return count; 2157 } 2158 2159 ssize_t core_alua_show_nonop_delay_msecs( 2160 struct t10_alua_tg_pt_gp *tg_pt_gp, 2161 char *page) 2162 { 2163 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 2164 } 2165 2166 ssize_t core_alua_store_nonop_delay_msecs( 2167 struct t10_alua_tg_pt_gp *tg_pt_gp, 2168 const char *page, 2169 size_t count) 2170 { 2171 unsigned long tmp; 2172 int ret; 2173 2174 ret = kstrtoul(page, 0, &tmp); 2175 if (ret < 0) { 2176 pr_err("Unable to extract nonop_delay_msecs\n"); 2177 return ret; 2178 } 2179 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 2180 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 2181 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 2182 ALUA_MAX_NONOP_DELAY_MSECS); 2183 return -EINVAL; 2184 } 2185 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 2186 2187 return count; 2188 } 2189 2190 ssize_t core_alua_show_trans_delay_msecs( 2191 struct t10_alua_tg_pt_gp *tg_pt_gp, 2192 char *page) 2193 { 2194 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 2195 } 2196 2197 ssize_t core_alua_store_trans_delay_msecs( 2198 struct t10_alua_tg_pt_gp *tg_pt_gp, 2199 const char *page, 2200 size_t count) 2201 { 2202 unsigned long tmp; 2203 int ret; 2204 2205 ret = kstrtoul(page, 0, &tmp); 2206 if (ret < 0) { 2207 pr_err("Unable to extract trans_delay_msecs\n"); 2208 return ret; 2209 } 2210 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 2211 pr_err("Passed trans_delay_msecs: %lu, exceeds" 2212 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 2213 ALUA_MAX_TRANS_DELAY_MSECS); 2214 return -EINVAL; 2215 } 2216 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 2217 2218 return count; 2219 } 2220 2221 ssize_t core_alua_show_implicit_trans_secs( 2222 struct t10_alua_tg_pt_gp *tg_pt_gp, 2223 char *page) 2224 { 2225 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs); 2226 } 2227 2228 ssize_t core_alua_store_implicit_trans_secs( 2229 struct t10_alua_tg_pt_gp *tg_pt_gp, 2230 const char *page, 2231 size_t count) 2232 { 2233 unsigned long tmp; 2234 int ret; 2235 2236 ret = kstrtoul(page, 0, &tmp); 2237 if (ret < 0) { 2238 pr_err("Unable to extract implicit_trans_secs\n"); 2239 return ret; 2240 } 2241 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) { 2242 pr_err("Passed implicit_trans_secs: %lu, exceeds" 2243 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp, 2244 ALUA_MAX_IMPLICIT_TRANS_SECS); 2245 return -EINVAL; 2246 } 2247 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp; 2248 2249 return count; 2250 } 2251 2252 ssize_t core_alua_show_preferred_bit( 2253 struct t10_alua_tg_pt_gp *tg_pt_gp, 2254 char *page) 2255 { 2256 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 2257 } 2258 2259 ssize_t core_alua_store_preferred_bit( 2260 struct t10_alua_tg_pt_gp *tg_pt_gp, 2261 const char *page, 2262 size_t count) 2263 { 2264 unsigned long tmp; 2265 int ret; 2266 2267 ret = kstrtoul(page, 0, &tmp); 2268 if (ret < 0) { 2269 pr_err("Unable to extract preferred ALUA value\n"); 2270 return ret; 2271 } 2272 if ((tmp != 0) && (tmp != 1)) { 2273 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 2274 return -EINVAL; 2275 } 2276 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 2277 2278 return count; 2279 } 2280 2281 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 2282 { 2283 if (!lun->lun_sep) 2284 return -ENODEV; 2285 2286 return sprintf(page, "%d\n", 2287 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); 2288 } 2289 2290 ssize_t core_alua_store_offline_bit( 2291 struct se_lun *lun, 2292 const char *page, 2293 size_t count) 2294 { 2295 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 2296 unsigned long tmp; 2297 int ret; 2298 2299 if (!lun->lun_sep) 2300 return -ENODEV; 2301 2302 ret = kstrtoul(page, 0, &tmp); 2303 if (ret < 0) { 2304 pr_err("Unable to extract alua_tg_pt_offline value\n"); 2305 return ret; 2306 } 2307 if ((tmp != 0) && (tmp != 1)) { 2308 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 2309 tmp); 2310 return -EINVAL; 2311 } 2312 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; 2313 if (!tg_pt_gp_mem) { 2314 pr_err("Unable to locate *tg_pt_gp_mem\n"); 2315 return -EINVAL; 2316 } 2317 2318 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, 2319 lun->lun_sep, 0, (int)tmp); 2320 if (ret < 0) 2321 return -EINVAL; 2322 2323 return count; 2324 } 2325 2326 ssize_t core_alua_show_secondary_status( 2327 struct se_lun *lun, 2328 char *page) 2329 { 2330 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); 2331 } 2332 2333 ssize_t core_alua_store_secondary_status( 2334 struct se_lun *lun, 2335 const char *page, 2336 size_t count) 2337 { 2338 unsigned long tmp; 2339 int ret; 2340 2341 ret = kstrtoul(page, 0, &tmp); 2342 if (ret < 0) { 2343 pr_err("Unable to extract alua_tg_pt_status\n"); 2344 return ret; 2345 } 2346 if ((tmp != ALUA_STATUS_NONE) && 2347 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && 2348 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) { 2349 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 2350 tmp); 2351 return -EINVAL; 2352 } 2353 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; 2354 2355 return count; 2356 } 2357 2358 ssize_t core_alua_show_secondary_write_metadata( 2359 struct se_lun *lun, 2360 char *page) 2361 { 2362 return sprintf(page, "%d\n", 2363 lun->lun_sep->sep_tg_pt_secondary_write_md); 2364 } 2365 2366 ssize_t core_alua_store_secondary_write_metadata( 2367 struct se_lun *lun, 2368 const char *page, 2369 size_t count) 2370 { 2371 unsigned long tmp; 2372 int ret; 2373 2374 ret = kstrtoul(page, 0, &tmp); 2375 if (ret < 0) { 2376 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2377 return ret; 2378 } 2379 if ((tmp != 0) && (tmp != 1)) { 2380 pr_err("Illegal value for alua_tg_pt_write_md:" 2381 " %lu\n", tmp); 2382 return -EINVAL; 2383 } 2384 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; 2385 2386 return count; 2387 } 2388 2389 int core_setup_alua(struct se_device *dev) 2390 { 2391 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && 2392 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2393 struct t10_alua_lu_gp_member *lu_gp_mem; 2394 2395 /* 2396 * Associate this struct se_device with the default ALUA 2397 * LUN Group. 2398 */ 2399 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2400 if (IS_ERR(lu_gp_mem)) 2401 return PTR_ERR(lu_gp_mem); 2402 2403 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2404 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2405 default_lu_gp); 2406 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2407 2408 pr_debug("%s: Adding to default ALUA LU Group:" 2409 " core/alua/lu_gps/default_lu_gp\n", 2410 dev->transport->name); 2411 } 2412 2413 return 0; 2414 } 2415