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