1 /******************************************************************************* 2 * Filename: target_core_alua.c 3 * 4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) 5 * 6 * (c) Copyright 2009-2012 RisingTide Systems LLC. 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 *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 explict, int offline); 48 49 static u16 alua_lu_gps_counter; 50 static u32 alua_lu_gps_count; 51 52 static DEFINE_SPINLOCK(lu_gps_lock); 53 static LIST_HEAD(lu_gps_list); 54 55 struct t10_alua_lu_gp *default_lu_gp; 56 57 /* 58 * REPORT_TARGET_PORT_GROUPS 59 * 60 * See spc4r17 section 6.27 61 */ 62 sense_reason_t 63 target_emulate_report_target_port_groups(struct se_cmd *cmd) 64 { 65 struct se_device *dev = cmd->se_dev; 66 struct se_port *port; 67 struct t10_alua_tg_pt_gp *tg_pt_gp; 68 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 69 unsigned char *buf; 70 u32 rd_len = 0, off; 71 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 72 73 /* 74 * Skip over RESERVED area to first Target port group descriptor 75 * depending on the PARAMETER DATA FORMAT type.. 76 */ 77 if (ext_hdr != 0) 78 off = 8; 79 else 80 off = 4; 81 82 if (cmd->data_length < off) { 83 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 84 " small for %s header\n", cmd->data_length, 85 (ext_hdr) ? "extended" : "normal"); 86 return TCM_INVALID_CDB_FIELD; 87 } 88 buf = transport_kmap_data_sg(cmd); 89 if (!buf) 90 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 91 92 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 93 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 94 tg_pt_gp_list) { 95 /* 96 * Check if the Target port group and Target port descriptor list 97 * based on tg_pt_gp_members count will fit into the response payload. 98 * Otherwise, bump rd_len to let the initiator know we have exceeded 99 * the allocation length and the response is truncated. 100 */ 101 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 102 cmd->data_length) { 103 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 104 continue; 105 } 106 /* 107 * PREF: Preferred target port bit, determine if this 108 * bit should be set for port group. 109 */ 110 if (tg_pt_gp->tg_pt_gp_pref) 111 buf[off] = 0x80; 112 /* 113 * Set the ASYMMETRIC ACCESS State 114 */ 115 buf[off++] |= (atomic_read( 116 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 117 /* 118 * Set supported ASYMMETRIC ACCESS State bits 119 */ 120 buf[off] = 0x80; /* T_SUP */ 121 buf[off] |= 0x40; /* O_SUP */ 122 buf[off] |= 0x8; /* U_SUP */ 123 buf[off] |= 0x4; /* S_SUP */ 124 buf[off] |= 0x2; /* AN_SUP */ 125 buf[off++] |= 0x1; /* AO_SUP */ 126 /* 127 * TARGET PORT GROUP 128 */ 129 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 130 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 131 132 off++; /* Skip over Reserved */ 133 /* 134 * STATUS CODE 135 */ 136 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 137 /* 138 * Vendor Specific field 139 */ 140 buf[off++] = 0x00; 141 /* 142 * TARGET PORT COUNT 143 */ 144 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 145 rd_len += 8; 146 147 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 148 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, 149 tg_pt_gp_mem_list) { 150 port = tg_pt_gp_mem->tg_pt; 151 /* 152 * Start Target Port descriptor format 153 * 154 * See spc4r17 section 6.2.7 Table 247 155 */ 156 off += 2; /* Skip over Obsolete */ 157 /* 158 * Set RELATIVE TARGET PORT IDENTIFIER 159 */ 160 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 161 buf[off++] = (port->sep_rtpi & 0xff); 162 rd_len += 4; 163 } 164 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 165 } 166 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 167 /* 168 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 169 */ 170 put_unaligned_be32(rd_len, &buf[0]); 171 172 /* 173 * Fill in the Extended header parameter data format if requested 174 */ 175 if (ext_hdr != 0) { 176 buf[4] = 0x10; 177 /* 178 * Set the implict transition time (in seconds) for the application 179 * client to use as a base for it's transition timeout value. 180 * 181 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 182 * this CDB was received upon to determine this value individually 183 * for ALUA target port group. 184 */ 185 port = cmd->se_lun->lun_sep; 186 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 187 if (tg_pt_gp_mem) { 188 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 189 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 190 if (tg_pt_gp) 191 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; 192 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 193 } 194 } 195 transport_kunmap_data_sg(cmd); 196 197 target_complete_cmd(cmd, GOOD); 198 return 0; 199 } 200 201 /* 202 * SET_TARGET_PORT_GROUPS for explict ALUA operation. 203 * 204 * See spc4r17 section 6.35 205 */ 206 sense_reason_t 207 target_emulate_set_target_port_groups(struct se_cmd *cmd) 208 { 209 struct se_device *dev = cmd->se_dev; 210 struct se_port *port, *l_port = cmd->se_lun->lun_sep; 211 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 212 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 213 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; 214 unsigned char *buf; 215 unsigned char *ptr; 216 sense_reason_t rc = TCM_NO_SENSE; 217 u32 len = 4; /* Skip over RESERVED area in header */ 218 int alua_access_state, primary = 0; 219 u16 tg_pt_id, rtpi; 220 221 if (!l_port) 222 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 223 224 if (cmd->data_length < 4) { 225 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 226 " small\n", cmd->data_length); 227 return TCM_INVALID_PARAMETER_LIST; 228 } 229 230 buf = transport_kmap_data_sg(cmd); 231 if (!buf) 232 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 233 234 /* 235 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed 236 * for the local tg_pt_gp. 237 */ 238 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; 239 if (!l_tg_pt_gp_mem) { 240 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); 241 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 242 goto out; 243 } 244 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 245 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; 246 if (!l_tg_pt_gp) { 247 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 248 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); 249 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 250 goto out; 251 } 252 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 253 254 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) { 255 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 256 " while TPGS_EXPLICT_ALUA is disabled\n"); 257 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 258 goto out; 259 } 260 261 ptr = &buf[4]; /* Skip over RESERVED area in header */ 262 263 while (len < cmd->data_length) { 264 bool found = false; 265 alua_access_state = (ptr[0] & 0x0f); 266 /* 267 * Check the received ALUA access state, and determine if 268 * the state is a primary or secondary target port asymmetric 269 * access state. 270 */ 271 rc = core_alua_check_transition(alua_access_state, &primary); 272 if (rc) { 273 /* 274 * If the SET TARGET PORT GROUPS attempts to establish 275 * an invalid combination of target port asymmetric 276 * access states or attempts to establish an 277 * unsupported target port asymmetric access state, 278 * then the command shall be terminated with CHECK 279 * CONDITION status, with the sense key set to ILLEGAL 280 * REQUEST, and the additional sense code set to INVALID 281 * FIELD IN PARAMETER LIST. 282 */ 283 goto out; 284 } 285 286 /* 287 * If the ASYMMETRIC ACCESS STATE field (see table 267) 288 * specifies a primary target port asymmetric access state, 289 * then the TARGET PORT GROUP OR TARGET PORT field specifies 290 * a primary target port group for which the primary target 291 * port asymmetric access state shall be changed. If the 292 * ASYMMETRIC ACCESS STATE field specifies a secondary target 293 * port asymmetric access state, then the TARGET PORT GROUP OR 294 * TARGET PORT field specifies the relative target port 295 * identifier (see 3.1.120) of the target port for which the 296 * secondary target port asymmetric access state shall be 297 * changed. 298 */ 299 if (primary) { 300 tg_pt_id = get_unaligned_be16(ptr + 2); 301 /* 302 * Locate the matching target port group ID from 303 * the global tg_pt_gp list 304 */ 305 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 306 list_for_each_entry(tg_pt_gp, 307 &dev->t10_alua.tg_pt_gps_list, 308 tg_pt_gp_list) { 309 if (!tg_pt_gp->tg_pt_gp_valid_id) 310 continue; 311 312 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 313 continue; 314 315 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 316 smp_mb__after_atomic_inc(); 317 318 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 319 320 if (!core_alua_do_port_transition(tg_pt_gp, 321 dev, l_port, nacl, 322 alua_access_state, 1)) 323 found = true; 324 325 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 326 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 327 smp_mb__after_atomic_dec(); 328 break; 329 } 330 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 331 } else { 332 /* 333 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify 334 * the Target Port in question for the the incoming 335 * SET_TARGET_PORT_GROUPS op. 336 */ 337 rtpi = get_unaligned_be16(ptr + 2); 338 /* 339 * Locate the matching relative target port identifier 340 * for the struct se_device storage object. 341 */ 342 spin_lock(&dev->se_port_lock); 343 list_for_each_entry(port, &dev->dev_sep_list, 344 sep_list) { 345 if (port->sep_rtpi != rtpi) 346 continue; 347 348 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 349 350 spin_unlock(&dev->se_port_lock); 351 352 if (!core_alua_set_tg_pt_secondary_state( 353 tg_pt_gp_mem, port, 1, 1)) 354 found = true; 355 356 spin_lock(&dev->se_port_lock); 357 break; 358 } 359 spin_unlock(&dev->se_port_lock); 360 } 361 362 if (!found) { 363 rc = TCM_INVALID_PARAMETER_LIST; 364 goto out; 365 } 366 367 ptr += 4; 368 len += 4; 369 } 370 371 out: 372 transport_kunmap_data_sg(cmd); 373 if (!rc) 374 target_complete_cmd(cmd, GOOD); 375 return rc; 376 } 377 378 static inline int core_alua_state_nonoptimized( 379 struct se_cmd *cmd, 380 unsigned char *cdb, 381 int nonop_delay_msecs, 382 u8 *alua_ascq) 383 { 384 /* 385 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 386 * later to determine if processing of this cmd needs to be 387 * temporarily delayed for the Active/NonOptimized primary access state. 388 */ 389 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 390 cmd->alua_nonop_delay = nonop_delay_msecs; 391 return 0; 392 } 393 394 static inline int core_alua_state_standby( 395 struct se_cmd *cmd, 396 unsigned char *cdb, 397 u8 *alua_ascq) 398 { 399 /* 400 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 401 * spc4r17 section 5.9.2.4.4 402 */ 403 switch (cdb[0]) { 404 case INQUIRY: 405 case LOG_SELECT: 406 case LOG_SENSE: 407 case MODE_SELECT: 408 case MODE_SENSE: 409 case REPORT_LUNS: 410 case RECEIVE_DIAGNOSTIC: 411 case SEND_DIAGNOSTIC: 412 return 0; 413 case MAINTENANCE_IN: 414 switch (cdb[1] & 0x1f) { 415 case MI_REPORT_TARGET_PGS: 416 return 0; 417 default: 418 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 419 return 1; 420 } 421 case MAINTENANCE_OUT: 422 switch (cdb[1]) { 423 case MO_SET_TARGET_PGS: 424 return 0; 425 default: 426 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 427 return 1; 428 } 429 case REQUEST_SENSE: 430 case PERSISTENT_RESERVE_IN: 431 case PERSISTENT_RESERVE_OUT: 432 case READ_BUFFER: 433 case WRITE_BUFFER: 434 return 0; 435 default: 436 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 437 return 1; 438 } 439 440 return 0; 441 } 442 443 static inline int core_alua_state_unavailable( 444 struct se_cmd *cmd, 445 unsigned char *cdb, 446 u8 *alua_ascq) 447 { 448 /* 449 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 450 * spc4r17 section 5.9.2.4.5 451 */ 452 switch (cdb[0]) { 453 case INQUIRY: 454 case REPORT_LUNS: 455 return 0; 456 case MAINTENANCE_IN: 457 switch (cdb[1] & 0x1f) { 458 case MI_REPORT_TARGET_PGS: 459 return 0; 460 default: 461 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 462 return 1; 463 } 464 case MAINTENANCE_OUT: 465 switch (cdb[1]) { 466 case MO_SET_TARGET_PGS: 467 return 0; 468 default: 469 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 470 return 1; 471 } 472 case REQUEST_SENSE: 473 case READ_BUFFER: 474 case WRITE_BUFFER: 475 return 0; 476 default: 477 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 478 return 1; 479 } 480 481 return 0; 482 } 483 484 static inline int core_alua_state_transition( 485 struct se_cmd *cmd, 486 unsigned char *cdb, 487 u8 *alua_ascq) 488 { 489 /* 490 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by 491 * spc4r17 section 5.9.2.5 492 */ 493 switch (cdb[0]) { 494 case INQUIRY: 495 case REPORT_LUNS: 496 return 0; 497 case MAINTENANCE_IN: 498 switch (cdb[1] & 0x1f) { 499 case MI_REPORT_TARGET_PGS: 500 return 0; 501 default: 502 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 503 return 1; 504 } 505 case REQUEST_SENSE: 506 case READ_BUFFER: 507 case WRITE_BUFFER: 508 return 0; 509 default: 510 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 511 return 1; 512 } 513 514 return 0; 515 } 516 517 /* 518 * return 1: Is used to signal LUN not accecsable, and check condition/not ready 519 * return 0: Used to signal success 520 * reutrn -1: Used to signal failure, and invalid cdb field 521 */ 522 sense_reason_t 523 target_alua_state_check(struct se_cmd *cmd) 524 { 525 struct se_device *dev = cmd->se_dev; 526 unsigned char *cdb = cmd->t_task_cdb; 527 struct se_lun *lun = cmd->se_lun; 528 struct se_port *port = lun->lun_sep; 529 struct t10_alua_tg_pt_gp *tg_pt_gp; 530 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 531 int out_alua_state, nonop_delay_msecs; 532 u8 alua_ascq; 533 int ret; 534 535 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 536 return 0; 537 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 538 return 0; 539 540 if (!port) 541 return 0; 542 /* 543 * First, check for a struct se_port specific secondary ALUA target port 544 * access state: OFFLINE 545 */ 546 if (atomic_read(&port->sep_tg_pt_secondary_offline)) { 547 pr_debug("ALUA: Got secondary offline status for local" 548 " target port\n"); 549 alua_ascq = ASCQ_04H_ALUA_OFFLINE; 550 ret = 1; 551 goto out; 552 } 553 /* 554 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the 555 * ALUA target port group, to obtain current ALUA access state. 556 * Otherwise look for the underlying struct se_device association with 557 * a ALUA logical unit group. 558 */ 559 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 560 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 561 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 562 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 563 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 564 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 565 /* 566 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional 567 * statement so the compiler knows explicitly to check this case first. 568 * For the Optimized ALUA access state case, we want to process the 569 * incoming fabric cmd ASAP.. 570 */ 571 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) 572 return 0; 573 574 switch (out_alua_state) { 575 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 576 ret = core_alua_state_nonoptimized(cmd, cdb, 577 nonop_delay_msecs, &alua_ascq); 578 break; 579 case ALUA_ACCESS_STATE_STANDBY: 580 ret = core_alua_state_standby(cmd, cdb, &alua_ascq); 581 break; 582 case ALUA_ACCESS_STATE_UNAVAILABLE: 583 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); 584 break; 585 case ALUA_ACCESS_STATE_TRANSITION: 586 ret = core_alua_state_transition(cmd, cdb, &alua_ascq); 587 break; 588 /* 589 * OFFLINE is a secondary ALUA target port group access state, that is 590 * handled above with struct se_port->sep_tg_pt_secondary_offline=1 591 */ 592 case ALUA_ACCESS_STATE_OFFLINE: 593 default: 594 pr_err("Unknown ALUA access state: 0x%02x\n", 595 out_alua_state); 596 return TCM_INVALID_CDB_FIELD; 597 } 598 599 out: 600 if (ret > 0) { 601 /* 602 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 603 * The ALUA additional sense code qualifier (ASCQ) is determined 604 * by the ALUA primary or secondary access state.. 605 */ 606 pr_debug("[%s]: ALUA TG Port not available, " 607 "SenseKey: NOT_READY, ASC/ASCQ: " 608 "0x04/0x%02x\n", 609 cmd->se_tfo->get_fabric_name(), alua_ascq); 610 611 cmd->scsi_asc = 0x04; 612 cmd->scsi_ascq = alua_ascq; 613 return TCM_CHECK_CONDITION_NOT_READY; 614 } 615 616 return 0; 617 } 618 619 /* 620 * Check implict and explict ALUA state change request. 621 */ 622 static sense_reason_t 623 core_alua_check_transition(int state, int *primary) 624 { 625 switch (state) { 626 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: 627 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 628 case ALUA_ACCESS_STATE_STANDBY: 629 case ALUA_ACCESS_STATE_UNAVAILABLE: 630 /* 631 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 632 * defined as primary target port asymmetric access states. 633 */ 634 *primary = 1; 635 break; 636 case ALUA_ACCESS_STATE_OFFLINE: 637 /* 638 * OFFLINE state is defined as a secondary target port 639 * asymmetric access state. 640 */ 641 *primary = 0; 642 break; 643 default: 644 pr_err("Unknown ALUA access state: 0x%02x\n", state); 645 return TCM_INVALID_PARAMETER_LIST; 646 } 647 648 return 0; 649 } 650 651 static char *core_alua_dump_state(int state) 652 { 653 switch (state) { 654 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: 655 return "Active/Optimized"; 656 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 657 return "Active/NonOptimized"; 658 case ALUA_ACCESS_STATE_STANDBY: 659 return "Standby"; 660 case ALUA_ACCESS_STATE_UNAVAILABLE: 661 return "Unavailable"; 662 case ALUA_ACCESS_STATE_OFFLINE: 663 return "Offline"; 664 default: 665 return "Unknown"; 666 } 667 668 return NULL; 669 } 670 671 char *core_alua_dump_status(int status) 672 { 673 switch (status) { 674 case ALUA_STATUS_NONE: 675 return "None"; 676 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: 677 return "Altered by Explict STPG"; 678 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: 679 return "Altered by Implict ALUA"; 680 default: 681 return "Unknown"; 682 } 683 684 return NULL; 685 } 686 687 /* 688 * Used by fabric modules to determine when we need to delay processing 689 * for the Active/NonOptimized paths.. 690 */ 691 int core_alua_check_nonop_delay( 692 struct se_cmd *cmd) 693 { 694 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 695 return 0; 696 if (in_interrupt()) 697 return 0; 698 /* 699 * The ALUA Active/NonOptimized access state delay can be disabled 700 * in via configfs with a value of zero 701 */ 702 if (!cmd->alua_nonop_delay) 703 return 0; 704 /* 705 * struct se_cmd->alua_nonop_delay gets set by a target port group 706 * defined interval in core_alua_state_nonoptimized() 707 */ 708 msleep_interruptible(cmd->alua_nonop_delay); 709 return 0; 710 } 711 EXPORT_SYMBOL(core_alua_check_nonop_delay); 712 713 /* 714 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex 715 * 716 */ 717 static int core_alua_write_tpg_metadata( 718 const char *path, 719 unsigned char *md_buf, 720 u32 md_buf_len) 721 { 722 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); 723 int ret; 724 725 if (IS_ERR(file)) { 726 pr_err("filp_open(%s) for ALUA metadata failed\n", path); 727 return -ENODEV; 728 } 729 ret = kernel_write(file, md_buf, md_buf_len, 0); 730 if (ret < 0) 731 pr_err("Error writing ALUA metadata file: %s\n", path); 732 fput(file); 733 return ret ? -EIO : 0; 734 } 735 736 /* 737 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 738 */ 739 static int core_alua_update_tpg_primary_metadata( 740 struct t10_alua_tg_pt_gp *tg_pt_gp, 741 int primary_state, 742 unsigned char *md_buf) 743 { 744 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 745 char path[ALUA_METADATA_PATH_LEN]; 746 int len; 747 748 memset(path, 0, ALUA_METADATA_PATH_LEN); 749 750 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, 751 "tg_pt_gp_id=%hu\n" 752 "alua_access_state=0x%02x\n" 753 "alua_access_status=0x%02x\n", 754 tg_pt_gp->tg_pt_gp_id, primary_state, 755 tg_pt_gp->tg_pt_gp_alua_access_status); 756 757 snprintf(path, ALUA_METADATA_PATH_LEN, 758 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], 759 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 760 761 return core_alua_write_tpg_metadata(path, md_buf, len); 762 } 763 764 static int core_alua_do_transition_tg_pt( 765 struct t10_alua_tg_pt_gp *tg_pt_gp, 766 struct se_port *l_port, 767 struct se_node_acl *nacl, 768 unsigned char *md_buf, 769 int new_state, 770 int explict) 771 { 772 struct se_dev_entry *se_deve; 773 struct se_lun_acl *lacl; 774 struct se_port *port; 775 struct t10_alua_tg_pt_gp_member *mem; 776 int old_state = 0; 777 /* 778 * Save the old primary ALUA access state, and set the current state 779 * to ALUA_ACCESS_STATE_TRANSITION. 780 */ 781 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 782 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 783 ALUA_ACCESS_STATE_TRANSITION); 784 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? 785 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : 786 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; 787 /* 788 * Check for the optional ALUA primary state transition delay 789 */ 790 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 791 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 792 793 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 794 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, 795 tg_pt_gp_mem_list) { 796 port = mem->tg_pt; 797 /* 798 * After an implicit target port asymmetric access state 799 * change, a device server shall establish a unit attention 800 * condition for the initiator port associated with every I_T 801 * nexus with the additional sense code set to ASYMMETRIC 802 * ACCESS STATE CHAGED. 803 * 804 * After an explicit target port asymmetric access state 805 * change, a device server shall establish a unit attention 806 * condition with the additional sense code set to ASYMMETRIC 807 * ACCESS STATE CHANGED for the initiator port associated with 808 * every I_T nexus other than the I_T nexus on which the SET 809 * TARGET PORT GROUPS command 810 */ 811 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); 812 smp_mb__after_atomic_inc(); 813 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 814 815 spin_lock_bh(&port->sep_alua_lock); 816 list_for_each_entry(se_deve, &port->sep_alua_list, 817 alua_port_list) { 818 lacl = se_deve->se_lun_acl; 819 /* 820 * se_deve->se_lun_acl pointer may be NULL for a 821 * entry created without explict Node+MappedLUN ACLs 822 */ 823 if (!lacl) 824 continue; 825 826 if (explict && 827 (nacl != NULL) && (nacl == lacl->se_lun_nacl) && 828 (l_port != NULL) && (l_port == port)) 829 continue; 830 831 core_scsi3_ua_allocate(lacl->se_lun_nacl, 832 se_deve->mapped_lun, 0x2A, 833 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 834 } 835 spin_unlock_bh(&port->sep_alua_lock); 836 837 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 838 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); 839 smp_mb__after_atomic_dec(); 840 } 841 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 842 /* 843 * Update the ALUA metadata buf that has been allocated in 844 * core_alua_do_port_transition(), this metadata will be written 845 * to struct file. 846 * 847 * Note that there is the case where we do not want to update the 848 * metadata when the saved metadata is being parsed in userspace 849 * when setting the existing port access state and access status. 850 * 851 * Also note that the failure to write out the ALUA metadata to 852 * struct file does NOT affect the actual ALUA transition. 853 */ 854 if (tg_pt_gp->tg_pt_gp_write_metadata) { 855 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 856 core_alua_update_tpg_primary_metadata(tg_pt_gp, 857 new_state, md_buf); 858 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 859 } 860 /* 861 * Set the current primary ALUA access state to the requested new state 862 */ 863 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); 864 865 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 866 " from primary access state %s to %s\n", (explict) ? "explict" : 867 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 868 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), 869 core_alua_dump_state(new_state)); 870 871 return 0; 872 } 873 874 int core_alua_do_port_transition( 875 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 876 struct se_device *l_dev, 877 struct se_port *l_port, 878 struct se_node_acl *l_nacl, 879 int new_state, 880 int explict) 881 { 882 struct se_device *dev; 883 struct se_port *port; 884 struct se_node_acl *nacl; 885 struct t10_alua_lu_gp *lu_gp; 886 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 887 struct t10_alua_tg_pt_gp *tg_pt_gp; 888 unsigned char *md_buf; 889 int primary; 890 891 if (core_alua_check_transition(new_state, &primary) != 0) 892 return -EINVAL; 893 894 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); 895 if (!md_buf) { 896 pr_err("Unable to allocate buf for ALUA metadata\n"); 897 return -ENOMEM; 898 } 899 900 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 901 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 902 lu_gp = local_lu_gp_mem->lu_gp; 903 atomic_inc(&lu_gp->lu_gp_ref_cnt); 904 smp_mb__after_atomic_inc(); 905 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 906 /* 907 * For storage objects that are members of the 'default_lu_gp', 908 * we only do transition on the passed *l_tp_pt_gp, and not 909 * on all of the matching target port groups IDs in default_lu_gp. 910 */ 911 if (!lu_gp->lu_gp_id) { 912 /* 913 * core_alua_do_transition_tg_pt() will always return 914 * success. 915 */ 916 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, 917 md_buf, new_state, explict); 918 atomic_dec(&lu_gp->lu_gp_ref_cnt); 919 smp_mb__after_atomic_dec(); 920 kfree(md_buf); 921 return 0; 922 } 923 /* 924 * For all other LU groups aside from 'default_lu_gp', walk all of 925 * the associated storage objects looking for a matching target port 926 * group ID from the local target port group. 927 */ 928 spin_lock(&lu_gp->lu_gp_lock); 929 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 930 lu_gp_mem_list) { 931 932 dev = lu_gp_mem->lu_gp_mem_dev; 933 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); 934 smp_mb__after_atomic_inc(); 935 spin_unlock(&lu_gp->lu_gp_lock); 936 937 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 938 list_for_each_entry(tg_pt_gp, 939 &dev->t10_alua.tg_pt_gps_list, 940 tg_pt_gp_list) { 941 942 if (!tg_pt_gp->tg_pt_gp_valid_id) 943 continue; 944 /* 945 * If the target behavior port asymmetric access state 946 * is changed for any target port group accessiable via 947 * a logical unit within a LU group, the target port 948 * behavior group asymmetric access states for the same 949 * target port group accessible via other logical units 950 * in that LU group will also change. 951 */ 952 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 953 continue; 954 955 if (l_tg_pt_gp == tg_pt_gp) { 956 port = l_port; 957 nacl = l_nacl; 958 } else { 959 port = NULL; 960 nacl = NULL; 961 } 962 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 963 smp_mb__after_atomic_inc(); 964 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 965 /* 966 * core_alua_do_transition_tg_pt() will always return 967 * success. 968 */ 969 core_alua_do_transition_tg_pt(tg_pt_gp, port, 970 nacl, md_buf, new_state, explict); 971 972 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 973 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 974 smp_mb__after_atomic_dec(); 975 } 976 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 977 978 spin_lock(&lu_gp->lu_gp_lock); 979 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); 980 smp_mb__after_atomic_dec(); 981 } 982 spin_unlock(&lu_gp->lu_gp_lock); 983 984 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 985 " Group IDs: %hu %s transition to primary state: %s\n", 986 config_item_name(&lu_gp->lu_gp_group.cg_item), 987 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", 988 core_alua_dump_state(new_state)); 989 990 atomic_dec(&lu_gp->lu_gp_ref_cnt); 991 smp_mb__after_atomic_dec(); 992 kfree(md_buf); 993 return 0; 994 } 995 996 /* 997 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held 998 */ 999 static int core_alua_update_tpg_secondary_metadata( 1000 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1001 struct se_port *port, 1002 unsigned char *md_buf, 1003 u32 md_buf_len) 1004 { 1005 struct se_portal_group *se_tpg = port->sep_tpg; 1006 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1007 int len; 1008 1009 memset(path, 0, ALUA_METADATA_PATH_LEN); 1010 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1011 1012 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1013 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1014 1015 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1016 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1017 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1018 1019 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" 1020 "alua_tg_pt_status=0x%02x\n", 1021 atomic_read(&port->sep_tg_pt_secondary_offline), 1022 port->sep_tg_pt_secondary_stat); 1023 1024 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", 1025 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1026 port->sep_lun->unpacked_lun); 1027 1028 return core_alua_write_tpg_metadata(path, md_buf, len); 1029 } 1030 1031 static int core_alua_set_tg_pt_secondary_state( 1032 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1033 struct se_port *port, 1034 int explict, 1035 int offline) 1036 { 1037 struct t10_alua_tg_pt_gp *tg_pt_gp; 1038 unsigned char *md_buf; 1039 u32 md_buf_len; 1040 int trans_delay_msecs; 1041 1042 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1043 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1044 if (!tg_pt_gp) { 1045 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1046 pr_err("Unable to complete secondary state" 1047 " transition\n"); 1048 return -EINVAL; 1049 } 1050 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1051 /* 1052 * Set the secondary ALUA target port access state to OFFLINE 1053 * or release the previously secondary state for struct se_port 1054 */ 1055 if (offline) 1056 atomic_set(&port->sep_tg_pt_secondary_offline, 1); 1057 else 1058 atomic_set(&port->sep_tg_pt_secondary_offline, 0); 1059 1060 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; 1061 port->sep_tg_pt_secondary_stat = (explict) ? 1062 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : 1063 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; 1064 1065 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1066 " to secondary access state: %s\n", (explict) ? "explict" : 1067 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1068 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1069 1070 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1071 /* 1072 * Do the optional transition delay after we set the secondary 1073 * ALUA access state. 1074 */ 1075 if (trans_delay_msecs != 0) 1076 msleep_interruptible(trans_delay_msecs); 1077 /* 1078 * See if we need to update the ALUA fabric port metadata for 1079 * secondary state and status 1080 */ 1081 if (port->sep_tg_pt_secondary_write_md) { 1082 md_buf = kzalloc(md_buf_len, GFP_KERNEL); 1083 if (!md_buf) { 1084 pr_err("Unable to allocate md_buf for" 1085 " secondary ALUA access metadata\n"); 1086 return -ENOMEM; 1087 } 1088 mutex_lock(&port->sep_tg_pt_md_mutex); 1089 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, 1090 md_buf, md_buf_len); 1091 mutex_unlock(&port->sep_tg_pt_md_mutex); 1092 1093 kfree(md_buf); 1094 } 1095 1096 return 0; 1097 } 1098 1099 struct t10_alua_lu_gp * 1100 core_alua_allocate_lu_gp(const char *name, int def_group) 1101 { 1102 struct t10_alua_lu_gp *lu_gp; 1103 1104 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1105 if (!lu_gp) { 1106 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1107 return ERR_PTR(-ENOMEM); 1108 } 1109 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1110 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1111 spin_lock_init(&lu_gp->lu_gp_lock); 1112 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1113 1114 if (def_group) { 1115 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1116 lu_gp->lu_gp_valid_id = 1; 1117 alua_lu_gps_count++; 1118 } 1119 1120 return lu_gp; 1121 } 1122 1123 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1124 { 1125 struct t10_alua_lu_gp *lu_gp_tmp; 1126 u16 lu_gp_id_tmp; 1127 /* 1128 * The lu_gp->lu_gp_id may only be set once.. 1129 */ 1130 if (lu_gp->lu_gp_valid_id) { 1131 pr_warn("ALUA LU Group already has a valid ID," 1132 " ignoring request\n"); 1133 return -EINVAL; 1134 } 1135 1136 spin_lock(&lu_gps_lock); 1137 if (alua_lu_gps_count == 0x0000ffff) { 1138 pr_err("Maximum ALUA alua_lu_gps_count:" 1139 " 0x0000ffff reached\n"); 1140 spin_unlock(&lu_gps_lock); 1141 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1142 return -ENOSPC; 1143 } 1144 again: 1145 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1146 alua_lu_gps_counter++; 1147 1148 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1149 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1150 if (!lu_gp_id) 1151 goto again; 1152 1153 pr_warn("ALUA Logical Unit Group ID: %hu" 1154 " already exists, ignoring request\n", 1155 lu_gp_id); 1156 spin_unlock(&lu_gps_lock); 1157 return -EINVAL; 1158 } 1159 } 1160 1161 lu_gp->lu_gp_id = lu_gp_id_tmp; 1162 lu_gp->lu_gp_valid_id = 1; 1163 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1164 alua_lu_gps_count++; 1165 spin_unlock(&lu_gps_lock); 1166 1167 return 0; 1168 } 1169 1170 static struct t10_alua_lu_gp_member * 1171 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1172 { 1173 struct t10_alua_lu_gp_member *lu_gp_mem; 1174 1175 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1176 if (!lu_gp_mem) { 1177 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1178 return ERR_PTR(-ENOMEM); 1179 } 1180 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1181 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1182 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1183 1184 lu_gp_mem->lu_gp_mem_dev = dev; 1185 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1186 1187 return lu_gp_mem; 1188 } 1189 1190 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1191 { 1192 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1193 /* 1194 * Once we have reached this point, config_item_put() has 1195 * already been called from target_core_alua_drop_lu_gp(). 1196 * 1197 * Here, we remove the *lu_gp from the global list so that 1198 * no associations can be made while we are releasing 1199 * struct t10_alua_lu_gp. 1200 */ 1201 spin_lock(&lu_gps_lock); 1202 list_del(&lu_gp->lu_gp_node); 1203 alua_lu_gps_count--; 1204 spin_unlock(&lu_gps_lock); 1205 /* 1206 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1207 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1208 * released with core_alua_put_lu_gp_from_name() 1209 */ 1210 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1211 cpu_relax(); 1212 /* 1213 * Release reference to struct t10_alua_lu_gp * from all associated 1214 * struct se_device. 1215 */ 1216 spin_lock(&lu_gp->lu_gp_lock); 1217 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1218 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1219 if (lu_gp_mem->lu_gp_assoc) { 1220 list_del(&lu_gp_mem->lu_gp_mem_list); 1221 lu_gp->lu_gp_members--; 1222 lu_gp_mem->lu_gp_assoc = 0; 1223 } 1224 spin_unlock(&lu_gp->lu_gp_lock); 1225 /* 1226 * 1227 * lu_gp_mem is associated with a single 1228 * struct se_device->dev_alua_lu_gp_mem, and is released when 1229 * struct se_device is released via core_alua_free_lu_gp_mem(). 1230 * 1231 * If the passed lu_gp does NOT match the default_lu_gp, assume 1232 * we want to re-assocate a given lu_gp_mem with default_lu_gp. 1233 */ 1234 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1235 if (lu_gp != default_lu_gp) 1236 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1237 default_lu_gp); 1238 else 1239 lu_gp_mem->lu_gp = NULL; 1240 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1241 1242 spin_lock(&lu_gp->lu_gp_lock); 1243 } 1244 spin_unlock(&lu_gp->lu_gp_lock); 1245 1246 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1247 } 1248 1249 void core_alua_free_lu_gp_mem(struct se_device *dev) 1250 { 1251 struct t10_alua_lu_gp *lu_gp; 1252 struct t10_alua_lu_gp_member *lu_gp_mem; 1253 1254 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1255 if (!lu_gp_mem) 1256 return; 1257 1258 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1259 cpu_relax(); 1260 1261 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1262 lu_gp = lu_gp_mem->lu_gp; 1263 if (lu_gp) { 1264 spin_lock(&lu_gp->lu_gp_lock); 1265 if (lu_gp_mem->lu_gp_assoc) { 1266 list_del(&lu_gp_mem->lu_gp_mem_list); 1267 lu_gp->lu_gp_members--; 1268 lu_gp_mem->lu_gp_assoc = 0; 1269 } 1270 spin_unlock(&lu_gp->lu_gp_lock); 1271 lu_gp_mem->lu_gp = NULL; 1272 } 1273 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1274 1275 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1276 } 1277 1278 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1279 { 1280 struct t10_alua_lu_gp *lu_gp; 1281 struct config_item *ci; 1282 1283 spin_lock(&lu_gps_lock); 1284 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1285 if (!lu_gp->lu_gp_valid_id) 1286 continue; 1287 ci = &lu_gp->lu_gp_group.cg_item; 1288 if (!strcmp(config_item_name(ci), name)) { 1289 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1290 spin_unlock(&lu_gps_lock); 1291 return lu_gp; 1292 } 1293 } 1294 spin_unlock(&lu_gps_lock); 1295 1296 return NULL; 1297 } 1298 1299 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1300 { 1301 spin_lock(&lu_gps_lock); 1302 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1303 spin_unlock(&lu_gps_lock); 1304 } 1305 1306 /* 1307 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1308 */ 1309 void __core_alua_attach_lu_gp_mem( 1310 struct t10_alua_lu_gp_member *lu_gp_mem, 1311 struct t10_alua_lu_gp *lu_gp) 1312 { 1313 spin_lock(&lu_gp->lu_gp_lock); 1314 lu_gp_mem->lu_gp = lu_gp; 1315 lu_gp_mem->lu_gp_assoc = 1; 1316 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1317 lu_gp->lu_gp_members++; 1318 spin_unlock(&lu_gp->lu_gp_lock); 1319 } 1320 1321 /* 1322 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1323 */ 1324 void __core_alua_drop_lu_gp_mem( 1325 struct t10_alua_lu_gp_member *lu_gp_mem, 1326 struct t10_alua_lu_gp *lu_gp) 1327 { 1328 spin_lock(&lu_gp->lu_gp_lock); 1329 list_del(&lu_gp_mem->lu_gp_mem_list); 1330 lu_gp_mem->lu_gp = NULL; 1331 lu_gp_mem->lu_gp_assoc = 0; 1332 lu_gp->lu_gp_members--; 1333 spin_unlock(&lu_gp->lu_gp_lock); 1334 } 1335 1336 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1337 const char *name, int def_group) 1338 { 1339 struct t10_alua_tg_pt_gp *tg_pt_gp; 1340 1341 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1342 if (!tg_pt_gp) { 1343 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1344 return NULL; 1345 } 1346 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1347 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); 1348 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1349 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1350 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1351 tg_pt_gp->tg_pt_gp_dev = dev; 1352 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; 1353 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1354 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); 1355 /* 1356 * Enable both explict and implict ALUA support by default 1357 */ 1358 tg_pt_gp->tg_pt_gp_alua_access_type = 1359 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; 1360 /* 1361 * Set the default Active/NonOptimized Delay in milliseconds 1362 */ 1363 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1364 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1365 tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; 1366 1367 if (def_group) { 1368 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1369 tg_pt_gp->tg_pt_gp_id = 1370 dev->t10_alua.alua_tg_pt_gps_counter++; 1371 tg_pt_gp->tg_pt_gp_valid_id = 1; 1372 dev->t10_alua.alua_tg_pt_gps_count++; 1373 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1374 &dev->t10_alua.tg_pt_gps_list); 1375 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1376 } 1377 1378 return tg_pt_gp; 1379 } 1380 1381 int core_alua_set_tg_pt_gp_id( 1382 struct t10_alua_tg_pt_gp *tg_pt_gp, 1383 u16 tg_pt_gp_id) 1384 { 1385 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1386 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1387 u16 tg_pt_gp_id_tmp; 1388 1389 /* 1390 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1391 */ 1392 if (tg_pt_gp->tg_pt_gp_valid_id) { 1393 pr_warn("ALUA TG PT Group already has a valid ID," 1394 " ignoring request\n"); 1395 return -EINVAL; 1396 } 1397 1398 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1399 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1400 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1401 " 0x0000ffff reached\n"); 1402 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1403 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1404 return -ENOSPC; 1405 } 1406 again: 1407 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1408 dev->t10_alua.alua_tg_pt_gps_counter++; 1409 1410 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1411 tg_pt_gp_list) { 1412 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1413 if (!tg_pt_gp_id) 1414 goto again; 1415 1416 pr_err("ALUA Target Port Group ID: %hu already" 1417 " exists, ignoring request\n", tg_pt_gp_id); 1418 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1419 return -EINVAL; 1420 } 1421 } 1422 1423 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1424 tg_pt_gp->tg_pt_gp_valid_id = 1; 1425 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1426 &dev->t10_alua.tg_pt_gps_list); 1427 dev->t10_alua.alua_tg_pt_gps_count++; 1428 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1429 1430 return 0; 1431 } 1432 1433 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( 1434 struct se_port *port) 1435 { 1436 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1437 1438 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, 1439 GFP_KERNEL); 1440 if (!tg_pt_gp_mem) { 1441 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); 1442 return ERR_PTR(-ENOMEM); 1443 } 1444 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1445 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1446 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); 1447 1448 tg_pt_gp_mem->tg_pt = port; 1449 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; 1450 1451 return tg_pt_gp_mem; 1452 } 1453 1454 void core_alua_free_tg_pt_gp( 1455 struct t10_alua_tg_pt_gp *tg_pt_gp) 1456 { 1457 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1458 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; 1459 1460 /* 1461 * Once we have reached this point, config_item_put() has already 1462 * been called from target_core_alua_drop_tg_pt_gp(). 1463 * 1464 * Here we remove *tg_pt_gp from the global list so that 1465 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS 1466 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1467 */ 1468 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1469 list_del(&tg_pt_gp->tg_pt_gp_list); 1470 dev->t10_alua.alua_tg_pt_gps_counter--; 1471 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1472 1473 /* 1474 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1475 * core_alua_get_tg_pt_gp_by_name() in 1476 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1477 * to be released with core_alua_put_tg_pt_gp_from_name(). 1478 */ 1479 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1480 cpu_relax(); 1481 1482 /* 1483 * Release reference to struct t10_alua_tg_pt_gp from all associated 1484 * struct se_port. 1485 */ 1486 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1487 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, 1488 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { 1489 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1490 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1491 tg_pt_gp->tg_pt_gp_members--; 1492 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1493 } 1494 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1495 /* 1496 * tg_pt_gp_mem is associated with a single 1497 * se_port->sep_alua_tg_pt_gp_mem, and is released via 1498 * core_alua_free_tg_pt_gp_mem(). 1499 * 1500 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1501 * assume we want to re-assocate a given tg_pt_gp_mem with 1502 * default_tg_pt_gp. 1503 */ 1504 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1505 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1506 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1507 dev->t10_alua.default_tg_pt_gp); 1508 } else 1509 tg_pt_gp_mem->tg_pt_gp = NULL; 1510 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1511 1512 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1513 } 1514 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1515 1516 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1517 } 1518 1519 void core_alua_free_tg_pt_gp_mem(struct se_port *port) 1520 { 1521 struct t10_alua_tg_pt_gp *tg_pt_gp; 1522 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1523 1524 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1525 if (!tg_pt_gp_mem) 1526 return; 1527 1528 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) 1529 cpu_relax(); 1530 1531 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1532 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1533 if (tg_pt_gp) { 1534 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1535 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1536 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1537 tg_pt_gp->tg_pt_gp_members--; 1538 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1539 } 1540 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1541 tg_pt_gp_mem->tg_pt_gp = NULL; 1542 } 1543 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1544 1545 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); 1546 } 1547 1548 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1549 struct se_device *dev, const char *name) 1550 { 1551 struct t10_alua_tg_pt_gp *tg_pt_gp; 1552 struct config_item *ci; 1553 1554 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1555 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1556 tg_pt_gp_list) { 1557 if (!tg_pt_gp->tg_pt_gp_valid_id) 1558 continue; 1559 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1560 if (!strcmp(config_item_name(ci), name)) { 1561 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1562 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1563 return tg_pt_gp; 1564 } 1565 } 1566 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1567 1568 return NULL; 1569 } 1570 1571 static void core_alua_put_tg_pt_gp_from_name( 1572 struct t10_alua_tg_pt_gp *tg_pt_gp) 1573 { 1574 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1575 1576 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1577 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1578 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1579 } 1580 1581 /* 1582 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1583 */ 1584 void __core_alua_attach_tg_pt_gp_mem( 1585 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1586 struct t10_alua_tg_pt_gp *tg_pt_gp) 1587 { 1588 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1589 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; 1590 tg_pt_gp_mem->tg_pt_gp_assoc = 1; 1591 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, 1592 &tg_pt_gp->tg_pt_gp_mem_list); 1593 tg_pt_gp->tg_pt_gp_members++; 1594 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1595 } 1596 1597 /* 1598 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1599 */ 1600 static void __core_alua_drop_tg_pt_gp_mem( 1601 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1602 struct t10_alua_tg_pt_gp *tg_pt_gp) 1603 { 1604 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1605 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1606 tg_pt_gp_mem->tg_pt_gp = NULL; 1607 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1608 tg_pt_gp->tg_pt_gp_members--; 1609 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1610 } 1611 1612 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) 1613 { 1614 struct config_item *tg_pt_ci; 1615 struct t10_alua_tg_pt_gp *tg_pt_gp; 1616 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1617 ssize_t len = 0; 1618 1619 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1620 if (!tg_pt_gp_mem) 1621 return len; 1622 1623 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1624 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1625 if (tg_pt_gp) { 1626 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1627 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1628 " %hu\nTG Port Primary Access State: %s\nTG Port " 1629 "Primary Access Status: %s\nTG Port Secondary Access" 1630 " State: %s\nTG Port Secondary Access Status: %s\n", 1631 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1632 core_alua_dump_state(atomic_read( 1633 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1634 core_alua_dump_status( 1635 tg_pt_gp->tg_pt_gp_alua_access_status), 1636 (atomic_read(&port->sep_tg_pt_secondary_offline)) ? 1637 "Offline" : "None", 1638 core_alua_dump_status(port->sep_tg_pt_secondary_stat)); 1639 } 1640 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1641 1642 return len; 1643 } 1644 1645 ssize_t core_alua_store_tg_pt_gp_info( 1646 struct se_port *port, 1647 const char *page, 1648 size_t count) 1649 { 1650 struct se_portal_group *tpg; 1651 struct se_lun *lun; 1652 struct se_device *dev = port->sep_lun->lun_se_dev; 1653 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1654 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1655 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1656 int move = 0; 1657 1658 tpg = port->sep_tpg; 1659 lun = port->sep_lun; 1660 1661 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1662 if (!tg_pt_gp_mem) 1663 return 0; 1664 1665 if (count > TG_PT_GROUP_NAME_BUF) { 1666 pr_err("ALUA Target Port Group alias too large!\n"); 1667 return -EINVAL; 1668 } 1669 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1670 memcpy(buf, page, count); 1671 /* 1672 * Any ALUA target port group alias besides "NULL" means we will be 1673 * making a new group association. 1674 */ 1675 if (strcmp(strstrip(buf), "NULL")) { 1676 /* 1677 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1678 * struct t10_alua_tg_pt_gp. This reference is released with 1679 * core_alua_put_tg_pt_gp_from_name() below. 1680 */ 1681 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1682 strstrip(buf)); 1683 if (!tg_pt_gp_new) 1684 return -ENODEV; 1685 } 1686 1687 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1688 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1689 if (tg_pt_gp) { 1690 /* 1691 * Clearing an existing tg_pt_gp association, and replacing 1692 * with the default_tg_pt_gp. 1693 */ 1694 if (!tg_pt_gp_new) { 1695 pr_debug("Target_Core_ConfigFS: Moving" 1696 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 1697 " alua/%s, ID: %hu back to" 1698 " default_tg_pt_gp\n", 1699 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1700 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1701 config_item_name(&lun->lun_group.cg_item), 1702 config_item_name( 1703 &tg_pt_gp->tg_pt_gp_group.cg_item), 1704 tg_pt_gp->tg_pt_gp_id); 1705 1706 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 1707 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1708 dev->t10_alua.default_tg_pt_gp); 1709 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1710 1711 return count; 1712 } 1713 /* 1714 * Removing existing association of tg_pt_gp_mem with tg_pt_gp 1715 */ 1716 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 1717 move = 1; 1718 } 1719 /* 1720 * Associate tg_pt_gp_mem with tg_pt_gp_new. 1721 */ 1722 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); 1723 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1724 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 1725 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 1726 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1727 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1728 config_item_name(&lun->lun_group.cg_item), 1729 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 1730 tg_pt_gp_new->tg_pt_gp_id); 1731 1732 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 1733 return count; 1734 } 1735 1736 ssize_t core_alua_show_access_type( 1737 struct t10_alua_tg_pt_gp *tg_pt_gp, 1738 char *page) 1739 { 1740 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && 1741 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) 1742 return sprintf(page, "Implict and Explict\n"); 1743 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) 1744 return sprintf(page, "Implict\n"); 1745 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) 1746 return sprintf(page, "Explict\n"); 1747 else 1748 return sprintf(page, "None\n"); 1749 } 1750 1751 ssize_t core_alua_store_access_type( 1752 struct t10_alua_tg_pt_gp *tg_pt_gp, 1753 const char *page, 1754 size_t count) 1755 { 1756 unsigned long tmp; 1757 int ret; 1758 1759 ret = strict_strtoul(page, 0, &tmp); 1760 if (ret < 0) { 1761 pr_err("Unable to extract alua_access_type\n"); 1762 return -EINVAL; 1763 } 1764 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 1765 pr_err("Illegal value for alua_access_type:" 1766 " %lu\n", tmp); 1767 return -EINVAL; 1768 } 1769 if (tmp == 3) 1770 tg_pt_gp->tg_pt_gp_alua_access_type = 1771 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; 1772 else if (tmp == 2) 1773 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; 1774 else if (tmp == 1) 1775 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; 1776 else 1777 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 1778 1779 return count; 1780 } 1781 1782 ssize_t core_alua_show_nonop_delay_msecs( 1783 struct t10_alua_tg_pt_gp *tg_pt_gp, 1784 char *page) 1785 { 1786 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 1787 } 1788 1789 ssize_t core_alua_store_nonop_delay_msecs( 1790 struct t10_alua_tg_pt_gp *tg_pt_gp, 1791 const char *page, 1792 size_t count) 1793 { 1794 unsigned long tmp; 1795 int ret; 1796 1797 ret = strict_strtoul(page, 0, &tmp); 1798 if (ret < 0) { 1799 pr_err("Unable to extract nonop_delay_msecs\n"); 1800 return -EINVAL; 1801 } 1802 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 1803 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 1804 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 1805 ALUA_MAX_NONOP_DELAY_MSECS); 1806 return -EINVAL; 1807 } 1808 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 1809 1810 return count; 1811 } 1812 1813 ssize_t core_alua_show_trans_delay_msecs( 1814 struct t10_alua_tg_pt_gp *tg_pt_gp, 1815 char *page) 1816 { 1817 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1818 } 1819 1820 ssize_t core_alua_store_trans_delay_msecs( 1821 struct t10_alua_tg_pt_gp *tg_pt_gp, 1822 const char *page, 1823 size_t count) 1824 { 1825 unsigned long tmp; 1826 int ret; 1827 1828 ret = strict_strtoul(page, 0, &tmp); 1829 if (ret < 0) { 1830 pr_err("Unable to extract trans_delay_msecs\n"); 1831 return -EINVAL; 1832 } 1833 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 1834 pr_err("Passed trans_delay_msecs: %lu, exceeds" 1835 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 1836 ALUA_MAX_TRANS_DELAY_MSECS); 1837 return -EINVAL; 1838 } 1839 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 1840 1841 return count; 1842 } 1843 1844 ssize_t core_alua_show_implict_trans_secs( 1845 struct t10_alua_tg_pt_gp *tg_pt_gp, 1846 char *page) 1847 { 1848 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); 1849 } 1850 1851 ssize_t core_alua_store_implict_trans_secs( 1852 struct t10_alua_tg_pt_gp *tg_pt_gp, 1853 const char *page, 1854 size_t count) 1855 { 1856 unsigned long tmp; 1857 int ret; 1858 1859 ret = strict_strtoul(page, 0, &tmp); 1860 if (ret < 0) { 1861 pr_err("Unable to extract implict_trans_secs\n"); 1862 return -EINVAL; 1863 } 1864 if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { 1865 pr_err("Passed implict_trans_secs: %lu, exceeds" 1866 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, 1867 ALUA_MAX_IMPLICT_TRANS_SECS); 1868 return -EINVAL; 1869 } 1870 tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; 1871 1872 return count; 1873 } 1874 1875 ssize_t core_alua_show_preferred_bit( 1876 struct t10_alua_tg_pt_gp *tg_pt_gp, 1877 char *page) 1878 { 1879 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 1880 } 1881 1882 ssize_t core_alua_store_preferred_bit( 1883 struct t10_alua_tg_pt_gp *tg_pt_gp, 1884 const char *page, 1885 size_t count) 1886 { 1887 unsigned long tmp; 1888 int ret; 1889 1890 ret = strict_strtoul(page, 0, &tmp); 1891 if (ret < 0) { 1892 pr_err("Unable to extract preferred ALUA value\n"); 1893 return -EINVAL; 1894 } 1895 if ((tmp != 0) && (tmp != 1)) { 1896 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 1897 return -EINVAL; 1898 } 1899 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 1900 1901 return count; 1902 } 1903 1904 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 1905 { 1906 if (!lun->lun_sep) 1907 return -ENODEV; 1908 1909 return sprintf(page, "%d\n", 1910 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); 1911 } 1912 1913 ssize_t core_alua_store_offline_bit( 1914 struct se_lun *lun, 1915 const char *page, 1916 size_t count) 1917 { 1918 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1919 unsigned long tmp; 1920 int ret; 1921 1922 if (!lun->lun_sep) 1923 return -ENODEV; 1924 1925 ret = strict_strtoul(page, 0, &tmp); 1926 if (ret < 0) { 1927 pr_err("Unable to extract alua_tg_pt_offline value\n"); 1928 return -EINVAL; 1929 } 1930 if ((tmp != 0) && (tmp != 1)) { 1931 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 1932 tmp); 1933 return -EINVAL; 1934 } 1935 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; 1936 if (!tg_pt_gp_mem) { 1937 pr_err("Unable to locate *tg_pt_gp_mem\n"); 1938 return -EINVAL; 1939 } 1940 1941 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, 1942 lun->lun_sep, 0, (int)tmp); 1943 if (ret < 0) 1944 return -EINVAL; 1945 1946 return count; 1947 } 1948 1949 ssize_t core_alua_show_secondary_status( 1950 struct se_lun *lun, 1951 char *page) 1952 { 1953 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); 1954 } 1955 1956 ssize_t core_alua_store_secondary_status( 1957 struct se_lun *lun, 1958 const char *page, 1959 size_t count) 1960 { 1961 unsigned long tmp; 1962 int ret; 1963 1964 ret = strict_strtoul(page, 0, &tmp); 1965 if (ret < 0) { 1966 pr_err("Unable to extract alua_tg_pt_status\n"); 1967 return -EINVAL; 1968 } 1969 if ((tmp != ALUA_STATUS_NONE) && 1970 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && 1971 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { 1972 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 1973 tmp); 1974 return -EINVAL; 1975 } 1976 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; 1977 1978 return count; 1979 } 1980 1981 ssize_t core_alua_show_secondary_write_metadata( 1982 struct se_lun *lun, 1983 char *page) 1984 { 1985 return sprintf(page, "%d\n", 1986 lun->lun_sep->sep_tg_pt_secondary_write_md); 1987 } 1988 1989 ssize_t core_alua_store_secondary_write_metadata( 1990 struct se_lun *lun, 1991 const char *page, 1992 size_t count) 1993 { 1994 unsigned long tmp; 1995 int ret; 1996 1997 ret = strict_strtoul(page, 0, &tmp); 1998 if (ret < 0) { 1999 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2000 return -EINVAL; 2001 } 2002 if ((tmp != 0) && (tmp != 1)) { 2003 pr_err("Illegal value for alua_tg_pt_write_md:" 2004 " %lu\n", tmp); 2005 return -EINVAL; 2006 } 2007 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; 2008 2009 return count; 2010 } 2011 2012 int core_setup_alua(struct se_device *dev) 2013 { 2014 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && 2015 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2016 struct t10_alua_lu_gp_member *lu_gp_mem; 2017 2018 /* 2019 * Associate this struct se_device with the default ALUA 2020 * LUN Group. 2021 */ 2022 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2023 if (IS_ERR(lu_gp_mem)) 2024 return PTR_ERR(lu_gp_mem); 2025 2026 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2027 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2028 default_lu_gp); 2029 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2030 2031 pr_debug("%s: Adding to default ALUA LU Group:" 2032 " core/alua/lu_gps/default_lu_gp\n", 2033 dev->transport->name); 2034 } 2035 2036 return 0; 2037 } 2038