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 <scsi/scsi.h> 31 #include <scsi/scsi_cmnd.h> 32 #include <asm/unaligned.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_backend.h> 36 #include <target/target_core_fabric.h> 37 #include <target/target_core_configfs.h> 38 39 #include "target_core_internal.h" 40 #include "target_core_alua.h" 41 #include "target_core_ua.h" 42 43 static sense_reason_t core_alua_check_transition(int state, int *primary); 44 static int core_alua_set_tg_pt_secondary_state( 45 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 46 struct se_port *port, int explict, int offline); 47 48 static u16 alua_lu_gps_counter; 49 static u32 alua_lu_gps_count; 50 51 static DEFINE_SPINLOCK(lu_gps_lock); 52 static LIST_HEAD(lu_gps_list); 53 54 struct t10_alua_lu_gp *default_lu_gp; 55 56 /* 57 * REPORT_TARGET_PORT_GROUPS 58 * 59 * See spc4r17 section 6.27 60 */ 61 sense_reason_t 62 target_emulate_report_target_port_groups(struct se_cmd *cmd) 63 { 64 struct se_device *dev = cmd->se_dev; 65 struct se_port *port; 66 struct t10_alua_tg_pt_gp *tg_pt_gp; 67 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 68 unsigned char *buf; 69 u32 rd_len = 0, off; 70 int ext_hdr = (cmd->t_task_cdb[1] & 0x20); 71 72 /* 73 * Skip over RESERVED area to first Target port group descriptor 74 * depending on the PARAMETER DATA FORMAT type.. 75 */ 76 if (ext_hdr != 0) 77 off = 8; 78 else 79 off = 4; 80 81 if (cmd->data_length < off) { 82 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" 83 " small for %s header\n", cmd->data_length, 84 (ext_hdr) ? "extended" : "normal"); 85 return TCM_INVALID_CDB_FIELD; 86 } 87 buf = transport_kmap_data_sg(cmd); 88 if (!buf) 89 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 90 91 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 92 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 93 tg_pt_gp_list) { 94 /* 95 * Check if the Target port group and Target port descriptor list 96 * based on tg_pt_gp_members count will fit into the response payload. 97 * Otherwise, bump rd_len to let the initiator know we have exceeded 98 * the allocation length and the response is truncated. 99 */ 100 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > 101 cmd->data_length) { 102 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); 103 continue; 104 } 105 /* 106 * PREF: Preferred target port bit, determine if this 107 * bit should be set for port group. 108 */ 109 if (tg_pt_gp->tg_pt_gp_pref) 110 buf[off] = 0x80; 111 /* 112 * Set the ASYMMETRIC ACCESS State 113 */ 114 buf[off++] |= (atomic_read( 115 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); 116 /* 117 * Set supported ASYMMETRIC ACCESS State bits 118 */ 119 buf[off] = 0x80; /* T_SUP */ 120 buf[off] |= 0x40; /* O_SUP */ 121 buf[off] |= 0x8; /* U_SUP */ 122 buf[off] |= 0x4; /* S_SUP */ 123 buf[off] |= 0x2; /* AN_SUP */ 124 buf[off++] |= 0x1; /* AO_SUP */ 125 /* 126 * TARGET PORT GROUP 127 */ 128 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); 129 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); 130 131 off++; /* Skip over Reserved */ 132 /* 133 * STATUS CODE 134 */ 135 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); 136 /* 137 * Vendor Specific field 138 */ 139 buf[off++] = 0x00; 140 /* 141 * TARGET PORT COUNT 142 */ 143 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); 144 rd_len += 8; 145 146 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 147 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, 148 tg_pt_gp_mem_list) { 149 port = tg_pt_gp_mem->tg_pt; 150 /* 151 * Start Target Port descriptor format 152 * 153 * See spc4r17 section 6.2.7 Table 247 154 */ 155 off += 2; /* Skip over Obsolete */ 156 /* 157 * Set RELATIVE TARGET PORT IDENTIFIER 158 */ 159 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 160 buf[off++] = (port->sep_rtpi & 0xff); 161 rd_len += 4; 162 } 163 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 164 } 165 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 166 /* 167 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload 168 */ 169 put_unaligned_be32(rd_len, &buf[0]); 170 171 /* 172 * Fill in the Extended header parameter data format if requested 173 */ 174 if (ext_hdr != 0) { 175 buf[4] = 0x10; 176 /* 177 * Set the implict transition time (in seconds) for the application 178 * client to use as a base for it's transition timeout value. 179 * 180 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN 181 * this CDB was received upon to determine this value individually 182 * for ALUA target port group. 183 */ 184 port = cmd->se_lun->lun_sep; 185 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 186 if (tg_pt_gp_mem) { 187 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 188 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 189 if (tg_pt_gp) 190 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; 191 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 192 } 193 } 194 transport_kunmap_data_sg(cmd); 195 196 target_complete_cmd(cmd, GOOD); 197 return 0; 198 } 199 200 /* 201 * SET_TARGET_PORT_GROUPS for explict ALUA operation. 202 * 203 * See spc4r17 section 6.35 204 */ 205 sense_reason_t 206 target_emulate_set_target_port_groups(struct se_cmd *cmd) 207 { 208 struct se_device *dev = cmd->se_dev; 209 struct se_port *port, *l_port = cmd->se_lun->lun_sep; 210 struct se_node_acl *nacl = cmd->se_sess->se_node_acl; 211 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; 212 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; 213 unsigned char *buf; 214 unsigned char *ptr; 215 sense_reason_t rc; 216 u32 len = 4; /* Skip over RESERVED area in header */ 217 int alua_access_state, primary = 0; 218 u16 tg_pt_id, rtpi; 219 220 if (!l_port) 221 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 222 223 if (cmd->data_length < 4) { 224 pr_warn("SET TARGET PORT GROUPS parameter list length %u too" 225 " small\n", cmd->data_length); 226 return TCM_INVALID_PARAMETER_LIST; 227 } 228 229 buf = transport_kmap_data_sg(cmd); 230 if (!buf) 231 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 232 233 /* 234 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed 235 * for the local tg_pt_gp. 236 */ 237 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; 238 if (!l_tg_pt_gp_mem) { 239 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); 240 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 241 goto out; 242 } 243 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 244 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; 245 if (!l_tg_pt_gp) { 246 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 247 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); 248 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 249 goto out; 250 } 251 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); 252 253 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) { 254 pr_debug("Unable to process SET_TARGET_PORT_GROUPS" 255 " while TPGS_EXPLICT_ALUA is disabled\n"); 256 rc = TCM_UNSUPPORTED_SCSI_OPCODE; 257 goto out; 258 } 259 260 ptr = &buf[4]; /* Skip over RESERVED area in header */ 261 262 while (len < cmd->data_length) { 263 bool found = false; 264 alua_access_state = (ptr[0] & 0x0f); 265 /* 266 * Check the received ALUA access state, and determine if 267 * the state is a primary or secondary target port asymmetric 268 * access state. 269 */ 270 rc = core_alua_check_transition(alua_access_state, &primary); 271 if (rc) { 272 /* 273 * If the SET TARGET PORT GROUPS attempts to establish 274 * an invalid combination of target port asymmetric 275 * access states or attempts to establish an 276 * unsupported target port asymmetric access state, 277 * then the command shall be terminated with CHECK 278 * CONDITION status, with the sense key set to ILLEGAL 279 * REQUEST, and the additional sense code set to INVALID 280 * FIELD IN PARAMETER LIST. 281 */ 282 goto out; 283 } 284 285 /* 286 * If the ASYMMETRIC ACCESS STATE field (see table 267) 287 * specifies a primary target port asymmetric access state, 288 * then the TARGET PORT GROUP OR TARGET PORT field specifies 289 * a primary target port group for which the primary target 290 * port asymmetric access state shall be changed. If the 291 * ASYMMETRIC ACCESS STATE field specifies a secondary target 292 * port asymmetric access state, then the TARGET PORT GROUP OR 293 * TARGET PORT field specifies the relative target port 294 * identifier (see 3.1.120) of the target port for which the 295 * secondary target port asymmetric access state shall be 296 * changed. 297 */ 298 if (primary) { 299 tg_pt_id = get_unaligned_be16(ptr + 2); 300 /* 301 * Locate the matching target port group ID from 302 * the global tg_pt_gp list 303 */ 304 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 305 list_for_each_entry(tg_pt_gp, 306 &dev->t10_alua.tg_pt_gps_list, 307 tg_pt_gp_list) { 308 if (!tg_pt_gp->tg_pt_gp_valid_id) 309 continue; 310 311 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) 312 continue; 313 314 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 315 smp_mb__after_atomic_inc(); 316 317 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 318 319 if (!core_alua_do_port_transition(tg_pt_gp, 320 dev, l_port, nacl, 321 alua_access_state, 1)) 322 found = true; 323 324 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 325 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 326 smp_mb__after_atomic_dec(); 327 break; 328 } 329 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 330 } else { 331 /* 332 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify 333 * the Target Port in question for the the incoming 334 * SET_TARGET_PORT_GROUPS op. 335 */ 336 rtpi = get_unaligned_be16(ptr + 2); 337 /* 338 * Locate the matching relative target port identifier 339 * for the struct se_device storage object. 340 */ 341 spin_lock(&dev->se_port_lock); 342 list_for_each_entry(port, &dev->dev_sep_list, 343 sep_list) { 344 if (port->sep_rtpi != rtpi) 345 continue; 346 347 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 348 349 spin_unlock(&dev->se_port_lock); 350 351 if (!core_alua_set_tg_pt_secondary_state( 352 tg_pt_gp_mem, port, 1, 1)) 353 found = true; 354 355 spin_lock(&dev->se_port_lock); 356 break; 357 } 358 spin_unlock(&dev->se_port_lock); 359 } 360 361 if (!found) { 362 rc = TCM_INVALID_PARAMETER_LIST; 363 goto out; 364 } 365 366 ptr += 4; 367 len += 4; 368 } 369 370 out: 371 transport_kunmap_data_sg(cmd); 372 if (!rc) 373 target_complete_cmd(cmd, GOOD); 374 return rc; 375 } 376 377 static inline int core_alua_state_nonoptimized( 378 struct se_cmd *cmd, 379 unsigned char *cdb, 380 int nonop_delay_msecs, 381 u8 *alua_ascq) 382 { 383 /* 384 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked 385 * later to determine if processing of this cmd needs to be 386 * temporarily delayed for the Active/NonOptimized primary access state. 387 */ 388 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; 389 cmd->alua_nonop_delay = nonop_delay_msecs; 390 return 0; 391 } 392 393 static inline int core_alua_state_standby( 394 struct se_cmd *cmd, 395 unsigned char *cdb, 396 u8 *alua_ascq) 397 { 398 /* 399 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by 400 * spc4r17 section 5.9.2.4.4 401 */ 402 switch (cdb[0]) { 403 case INQUIRY: 404 case LOG_SELECT: 405 case LOG_SENSE: 406 case MODE_SELECT: 407 case MODE_SENSE: 408 case REPORT_LUNS: 409 case RECEIVE_DIAGNOSTIC: 410 case SEND_DIAGNOSTIC: 411 case MAINTENANCE_IN: 412 switch (cdb[1] & 0x1f) { 413 case MI_REPORT_TARGET_PGS: 414 return 0; 415 default: 416 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 417 return 1; 418 } 419 case MAINTENANCE_OUT: 420 switch (cdb[1]) { 421 case MO_SET_TARGET_PGS: 422 return 0; 423 default: 424 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 425 return 1; 426 } 427 case REQUEST_SENSE: 428 case PERSISTENT_RESERVE_IN: 429 case PERSISTENT_RESERVE_OUT: 430 case READ_BUFFER: 431 case WRITE_BUFFER: 432 return 0; 433 default: 434 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; 435 return 1; 436 } 437 438 return 0; 439 } 440 441 static inline int core_alua_state_unavailable( 442 struct se_cmd *cmd, 443 unsigned char *cdb, 444 u8 *alua_ascq) 445 { 446 /* 447 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by 448 * spc4r17 section 5.9.2.4.5 449 */ 450 switch (cdb[0]) { 451 case INQUIRY: 452 case REPORT_LUNS: 453 case MAINTENANCE_IN: 454 switch (cdb[1] & 0x1f) { 455 case MI_REPORT_TARGET_PGS: 456 return 0; 457 default: 458 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 459 return 1; 460 } 461 case MAINTENANCE_OUT: 462 switch (cdb[1]) { 463 case MO_SET_TARGET_PGS: 464 return 0; 465 default: 466 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 467 return 1; 468 } 469 case REQUEST_SENSE: 470 case READ_BUFFER: 471 case WRITE_BUFFER: 472 return 0; 473 default: 474 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; 475 return 1; 476 } 477 478 return 0; 479 } 480 481 static inline int core_alua_state_transition( 482 struct se_cmd *cmd, 483 unsigned char *cdb, 484 u8 *alua_ascq) 485 { 486 /* 487 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by 488 * spc4r17 section 5.9.2.5 489 */ 490 switch (cdb[0]) { 491 case INQUIRY: 492 case REPORT_LUNS: 493 case MAINTENANCE_IN: 494 switch (cdb[1] & 0x1f) { 495 case MI_REPORT_TARGET_PGS: 496 return 0; 497 default: 498 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 499 return 1; 500 } 501 case REQUEST_SENSE: 502 case READ_BUFFER: 503 case WRITE_BUFFER: 504 return 0; 505 default: 506 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; 507 return 1; 508 } 509 510 return 0; 511 } 512 513 /* 514 * return 1: Is used to signal LUN not accecsable, and check condition/not ready 515 * return 0: Used to signal success 516 * reutrn -1: Used to signal failure, and invalid cdb field 517 */ 518 sense_reason_t 519 target_alua_state_check(struct se_cmd *cmd) 520 { 521 struct se_device *dev = cmd->se_dev; 522 unsigned char *cdb = cmd->t_task_cdb; 523 struct se_lun *lun = cmd->se_lun; 524 struct se_port *port = lun->lun_sep; 525 struct t10_alua_tg_pt_gp *tg_pt_gp; 526 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 527 int out_alua_state, nonop_delay_msecs; 528 u8 alua_ascq; 529 int ret; 530 531 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) 532 return 0; 533 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) 534 return 0; 535 536 if (!port) 537 return 0; 538 /* 539 * First, check for a struct se_port specific secondary ALUA target port 540 * access state: OFFLINE 541 */ 542 if (atomic_read(&port->sep_tg_pt_secondary_offline)) { 543 pr_debug("ALUA: Got secondary offline status for local" 544 " target port\n"); 545 alua_ascq = ASCQ_04H_ALUA_OFFLINE; 546 ret = 1; 547 goto out; 548 } 549 /* 550 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the 551 * ALUA target port group, to obtain current ALUA access state. 552 * Otherwise look for the underlying struct se_device association with 553 * a ALUA logical unit group. 554 */ 555 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 556 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 557 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 558 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 559 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; 560 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 561 /* 562 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional 563 * statement so the compiler knows explicitly to check this case first. 564 * For the Optimized ALUA access state case, we want to process the 565 * incoming fabric cmd ASAP.. 566 */ 567 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) 568 return 0; 569 570 switch (out_alua_state) { 571 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 572 ret = core_alua_state_nonoptimized(cmd, cdb, 573 nonop_delay_msecs, &alua_ascq); 574 break; 575 case ALUA_ACCESS_STATE_STANDBY: 576 ret = core_alua_state_standby(cmd, cdb, &alua_ascq); 577 break; 578 case ALUA_ACCESS_STATE_UNAVAILABLE: 579 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); 580 break; 581 case ALUA_ACCESS_STATE_TRANSITION: 582 ret = core_alua_state_transition(cmd, cdb, &alua_ascq); 583 break; 584 /* 585 * OFFLINE is a secondary ALUA target port group access state, that is 586 * handled above with struct se_port->sep_tg_pt_secondary_offline=1 587 */ 588 case ALUA_ACCESS_STATE_OFFLINE: 589 default: 590 pr_err("Unknown ALUA access state: 0x%02x\n", 591 out_alua_state); 592 return TCM_INVALID_CDB_FIELD; 593 } 594 595 out: 596 if (ret > 0) { 597 /* 598 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 599 * The ALUA additional sense code qualifier (ASCQ) is determined 600 * by the ALUA primary or secondary access state.. 601 */ 602 pr_debug("[%s]: ALUA TG Port not available, " 603 "SenseKey: NOT_READY, ASC/ASCQ: " 604 "0x04/0x%02x\n", 605 cmd->se_tfo->get_fabric_name(), alua_ascq); 606 607 cmd->scsi_asc = 0x04; 608 cmd->scsi_ascq = alua_ascq; 609 return TCM_CHECK_CONDITION_NOT_READY; 610 } 611 612 return 0; 613 } 614 615 /* 616 * Check implict and explict ALUA state change request. 617 */ 618 static sense_reason_t 619 core_alua_check_transition(int state, int *primary) 620 { 621 switch (state) { 622 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: 623 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 624 case ALUA_ACCESS_STATE_STANDBY: 625 case ALUA_ACCESS_STATE_UNAVAILABLE: 626 /* 627 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are 628 * defined as primary target port asymmetric access states. 629 */ 630 *primary = 1; 631 break; 632 case ALUA_ACCESS_STATE_OFFLINE: 633 /* 634 * OFFLINE state is defined as a secondary target port 635 * asymmetric access state. 636 */ 637 *primary = 0; 638 break; 639 default: 640 pr_err("Unknown ALUA access state: 0x%02x\n", state); 641 return TCM_INVALID_PARAMETER_LIST; 642 } 643 644 return 0; 645 } 646 647 static char *core_alua_dump_state(int state) 648 { 649 switch (state) { 650 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: 651 return "Active/Optimized"; 652 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: 653 return "Active/NonOptimized"; 654 case ALUA_ACCESS_STATE_STANDBY: 655 return "Standby"; 656 case ALUA_ACCESS_STATE_UNAVAILABLE: 657 return "Unavailable"; 658 case ALUA_ACCESS_STATE_OFFLINE: 659 return "Offline"; 660 default: 661 return "Unknown"; 662 } 663 664 return NULL; 665 } 666 667 char *core_alua_dump_status(int status) 668 { 669 switch (status) { 670 case ALUA_STATUS_NONE: 671 return "None"; 672 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: 673 return "Altered by Explict STPG"; 674 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: 675 return "Altered by Implict ALUA"; 676 default: 677 return "Unknown"; 678 } 679 680 return NULL; 681 } 682 683 /* 684 * Used by fabric modules to determine when we need to delay processing 685 * for the Active/NonOptimized paths.. 686 */ 687 int core_alua_check_nonop_delay( 688 struct se_cmd *cmd) 689 { 690 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) 691 return 0; 692 if (in_interrupt()) 693 return 0; 694 /* 695 * The ALUA Active/NonOptimized access state delay can be disabled 696 * in via configfs with a value of zero 697 */ 698 if (!cmd->alua_nonop_delay) 699 return 0; 700 /* 701 * struct se_cmd->alua_nonop_delay gets set by a target port group 702 * defined interval in core_alua_state_nonoptimized() 703 */ 704 msleep_interruptible(cmd->alua_nonop_delay); 705 return 0; 706 } 707 EXPORT_SYMBOL(core_alua_check_nonop_delay); 708 709 /* 710 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex 711 * 712 */ 713 static int core_alua_write_tpg_metadata( 714 const char *path, 715 unsigned char *md_buf, 716 u32 md_buf_len) 717 { 718 mm_segment_t old_fs; 719 struct file *file; 720 struct iovec iov[1]; 721 int flags = O_RDWR | O_CREAT | O_TRUNC, ret; 722 723 memset(iov, 0, sizeof(struct iovec)); 724 725 file = filp_open(path, flags, 0600); 726 if (IS_ERR(file) || !file || !file->f_dentry) { 727 pr_err("filp_open(%s) for ALUA metadata failed\n", 728 path); 729 return -ENODEV; 730 } 731 732 iov[0].iov_base = &md_buf[0]; 733 iov[0].iov_len = md_buf_len; 734 735 old_fs = get_fs(); 736 set_fs(get_ds()); 737 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 738 set_fs(old_fs); 739 740 if (ret < 0) { 741 pr_err("Error writing ALUA metadata file: %s\n", path); 742 filp_close(file, NULL); 743 return -EIO; 744 } 745 filp_close(file, NULL); 746 747 return 0; 748 } 749 750 /* 751 * Called with tg_pt_gp->tg_pt_gp_md_mutex held 752 */ 753 static int core_alua_update_tpg_primary_metadata( 754 struct t10_alua_tg_pt_gp *tg_pt_gp, 755 int primary_state, 756 unsigned char *md_buf) 757 { 758 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; 759 char path[ALUA_METADATA_PATH_LEN]; 760 int len; 761 762 memset(path, 0, ALUA_METADATA_PATH_LEN); 763 764 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, 765 "tg_pt_gp_id=%hu\n" 766 "alua_access_state=0x%02x\n" 767 "alua_access_status=0x%02x\n", 768 tg_pt_gp->tg_pt_gp_id, primary_state, 769 tg_pt_gp->tg_pt_gp_alua_access_status); 770 771 snprintf(path, ALUA_METADATA_PATH_LEN, 772 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], 773 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); 774 775 return core_alua_write_tpg_metadata(path, md_buf, len); 776 } 777 778 static int core_alua_do_transition_tg_pt( 779 struct t10_alua_tg_pt_gp *tg_pt_gp, 780 struct se_port *l_port, 781 struct se_node_acl *nacl, 782 unsigned char *md_buf, 783 int new_state, 784 int explict) 785 { 786 struct se_dev_entry *se_deve; 787 struct se_lun_acl *lacl; 788 struct se_port *port; 789 struct t10_alua_tg_pt_gp_member *mem; 790 int old_state = 0; 791 /* 792 * Save the old primary ALUA access state, and set the current state 793 * to ALUA_ACCESS_STATE_TRANSITION. 794 */ 795 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); 796 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 797 ALUA_ACCESS_STATE_TRANSITION); 798 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? 799 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : 800 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; 801 /* 802 * Check for the optional ALUA primary state transition delay 803 */ 804 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) 805 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); 806 807 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 808 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, 809 tg_pt_gp_mem_list) { 810 port = mem->tg_pt; 811 /* 812 * After an implicit target port asymmetric access state 813 * change, a device server shall establish a unit attention 814 * condition for the initiator port associated with every I_T 815 * nexus with the additional sense code set to ASYMMETRIC 816 * ACCESS STATE CHAGED. 817 * 818 * After an explicit target port asymmetric access state 819 * change, a device server shall establish a unit attention 820 * condition with the additional sense code set to ASYMMETRIC 821 * ACCESS STATE CHANGED for the initiator port associated with 822 * every I_T nexus other than the I_T nexus on which the SET 823 * TARGET PORT GROUPS command 824 */ 825 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); 826 smp_mb__after_atomic_inc(); 827 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 828 829 spin_lock_bh(&port->sep_alua_lock); 830 list_for_each_entry(se_deve, &port->sep_alua_list, 831 alua_port_list) { 832 lacl = se_deve->se_lun_acl; 833 /* 834 * se_deve->se_lun_acl pointer may be NULL for a 835 * entry created without explict Node+MappedLUN ACLs 836 */ 837 if (!lacl) 838 continue; 839 840 if (explict && 841 (nacl != NULL) && (nacl == lacl->se_lun_nacl) && 842 (l_port != NULL) && (l_port == port)) 843 continue; 844 845 core_scsi3_ua_allocate(lacl->se_lun_nacl, 846 se_deve->mapped_lun, 0x2A, 847 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); 848 } 849 spin_unlock_bh(&port->sep_alua_lock); 850 851 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 852 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); 853 smp_mb__after_atomic_dec(); 854 } 855 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 856 /* 857 * Update the ALUA metadata buf that has been allocated in 858 * core_alua_do_port_transition(), this metadata will be written 859 * to struct file. 860 * 861 * Note that there is the case where we do not want to update the 862 * metadata when the saved metadata is being parsed in userspace 863 * when setting the existing port access state and access status. 864 * 865 * Also note that the failure to write out the ALUA metadata to 866 * struct file does NOT affect the actual ALUA transition. 867 */ 868 if (tg_pt_gp->tg_pt_gp_write_metadata) { 869 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); 870 core_alua_update_tpg_primary_metadata(tg_pt_gp, 871 new_state, md_buf); 872 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); 873 } 874 /* 875 * Set the current primary ALUA access state to the requested new state 876 */ 877 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); 878 879 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 880 " from primary access state %s to %s\n", (explict) ? "explict" : 881 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 882 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), 883 core_alua_dump_state(new_state)); 884 885 return 0; 886 } 887 888 int core_alua_do_port_transition( 889 struct t10_alua_tg_pt_gp *l_tg_pt_gp, 890 struct se_device *l_dev, 891 struct se_port *l_port, 892 struct se_node_acl *l_nacl, 893 int new_state, 894 int explict) 895 { 896 struct se_device *dev; 897 struct se_port *port; 898 struct se_node_acl *nacl; 899 struct t10_alua_lu_gp *lu_gp; 900 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; 901 struct t10_alua_tg_pt_gp *tg_pt_gp; 902 unsigned char *md_buf; 903 int primary; 904 905 if (core_alua_check_transition(new_state, &primary) != 0) 906 return -EINVAL; 907 908 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); 909 if (!md_buf) { 910 pr_err("Unable to allocate buf for ALUA metadata\n"); 911 return -ENOMEM; 912 } 913 914 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; 915 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); 916 lu_gp = local_lu_gp_mem->lu_gp; 917 atomic_inc(&lu_gp->lu_gp_ref_cnt); 918 smp_mb__after_atomic_inc(); 919 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); 920 /* 921 * For storage objects that are members of the 'default_lu_gp', 922 * we only do transition on the passed *l_tp_pt_gp, and not 923 * on all of the matching target port groups IDs in default_lu_gp. 924 */ 925 if (!lu_gp->lu_gp_id) { 926 /* 927 * core_alua_do_transition_tg_pt() will always return 928 * success. 929 */ 930 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, 931 md_buf, new_state, explict); 932 atomic_dec(&lu_gp->lu_gp_ref_cnt); 933 smp_mb__after_atomic_dec(); 934 kfree(md_buf); 935 return 0; 936 } 937 /* 938 * For all other LU groups aside from 'default_lu_gp', walk all of 939 * the associated storage objects looking for a matching target port 940 * group ID from the local target port group. 941 */ 942 spin_lock(&lu_gp->lu_gp_lock); 943 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, 944 lu_gp_mem_list) { 945 946 dev = lu_gp_mem->lu_gp_mem_dev; 947 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); 948 smp_mb__after_atomic_inc(); 949 spin_unlock(&lu_gp->lu_gp_lock); 950 951 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 952 list_for_each_entry(tg_pt_gp, 953 &dev->t10_alua.tg_pt_gps_list, 954 tg_pt_gp_list) { 955 956 if (!tg_pt_gp->tg_pt_gp_valid_id) 957 continue; 958 /* 959 * If the target behavior port asymmetric access state 960 * is changed for any target port group accessiable via 961 * a logical unit within a LU group, the target port 962 * behavior group asymmetric access states for the same 963 * target port group accessible via other logical units 964 * in that LU group will also change. 965 */ 966 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) 967 continue; 968 969 if (l_tg_pt_gp == tg_pt_gp) { 970 port = l_port; 971 nacl = l_nacl; 972 } else { 973 port = NULL; 974 nacl = NULL; 975 } 976 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 977 smp_mb__after_atomic_inc(); 978 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 979 /* 980 * core_alua_do_transition_tg_pt() will always return 981 * success. 982 */ 983 core_alua_do_transition_tg_pt(tg_pt_gp, port, 984 nacl, md_buf, new_state, explict); 985 986 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 987 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 988 smp_mb__after_atomic_dec(); 989 } 990 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 991 992 spin_lock(&lu_gp->lu_gp_lock); 993 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); 994 smp_mb__after_atomic_dec(); 995 } 996 spin_unlock(&lu_gp->lu_gp_lock); 997 998 pr_debug("Successfully processed LU Group: %s all ALUA TG PT" 999 " Group IDs: %hu %s transition to primary state: %s\n", 1000 config_item_name(&lu_gp->lu_gp_group.cg_item), 1001 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", 1002 core_alua_dump_state(new_state)); 1003 1004 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1005 smp_mb__after_atomic_dec(); 1006 kfree(md_buf); 1007 return 0; 1008 } 1009 1010 /* 1011 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held 1012 */ 1013 static int core_alua_update_tpg_secondary_metadata( 1014 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1015 struct se_port *port, 1016 unsigned char *md_buf, 1017 u32 md_buf_len) 1018 { 1019 struct se_portal_group *se_tpg = port->sep_tpg; 1020 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; 1021 int len; 1022 1023 memset(path, 0, ALUA_METADATA_PATH_LEN); 1024 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); 1025 1026 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", 1027 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); 1028 1029 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) 1030 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", 1031 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); 1032 1033 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" 1034 "alua_tg_pt_status=0x%02x\n", 1035 atomic_read(&port->sep_tg_pt_secondary_offline), 1036 port->sep_tg_pt_secondary_stat); 1037 1038 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", 1039 se_tpg->se_tpg_tfo->get_fabric_name(), wwn, 1040 port->sep_lun->unpacked_lun); 1041 1042 return core_alua_write_tpg_metadata(path, md_buf, len); 1043 } 1044 1045 static int core_alua_set_tg_pt_secondary_state( 1046 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1047 struct se_port *port, 1048 int explict, 1049 int offline) 1050 { 1051 struct t10_alua_tg_pt_gp *tg_pt_gp; 1052 unsigned char *md_buf; 1053 u32 md_buf_len; 1054 int trans_delay_msecs; 1055 1056 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1057 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1058 if (!tg_pt_gp) { 1059 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1060 pr_err("Unable to complete secondary state" 1061 " transition\n"); 1062 return -EINVAL; 1063 } 1064 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; 1065 /* 1066 * Set the secondary ALUA target port access state to OFFLINE 1067 * or release the previously secondary state for struct se_port 1068 */ 1069 if (offline) 1070 atomic_set(&port->sep_tg_pt_secondary_offline, 1); 1071 else 1072 atomic_set(&port->sep_tg_pt_secondary_offline, 0); 1073 1074 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; 1075 port->sep_tg_pt_secondary_stat = (explict) ? 1076 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : 1077 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; 1078 1079 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" 1080 " to secondary access state: %s\n", (explict) ? "explict" : 1081 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), 1082 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); 1083 1084 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1085 /* 1086 * Do the optional transition delay after we set the secondary 1087 * ALUA access state. 1088 */ 1089 if (trans_delay_msecs != 0) 1090 msleep_interruptible(trans_delay_msecs); 1091 /* 1092 * See if we need to update the ALUA fabric port metadata for 1093 * secondary state and status 1094 */ 1095 if (port->sep_tg_pt_secondary_write_md) { 1096 md_buf = kzalloc(md_buf_len, GFP_KERNEL); 1097 if (!md_buf) { 1098 pr_err("Unable to allocate md_buf for" 1099 " secondary ALUA access metadata\n"); 1100 return -ENOMEM; 1101 } 1102 mutex_lock(&port->sep_tg_pt_md_mutex); 1103 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, 1104 md_buf, md_buf_len); 1105 mutex_unlock(&port->sep_tg_pt_md_mutex); 1106 1107 kfree(md_buf); 1108 } 1109 1110 return 0; 1111 } 1112 1113 struct t10_alua_lu_gp * 1114 core_alua_allocate_lu_gp(const char *name, int def_group) 1115 { 1116 struct t10_alua_lu_gp *lu_gp; 1117 1118 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); 1119 if (!lu_gp) { 1120 pr_err("Unable to allocate struct t10_alua_lu_gp\n"); 1121 return ERR_PTR(-ENOMEM); 1122 } 1123 INIT_LIST_HEAD(&lu_gp->lu_gp_node); 1124 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); 1125 spin_lock_init(&lu_gp->lu_gp_lock); 1126 atomic_set(&lu_gp->lu_gp_ref_cnt, 0); 1127 1128 if (def_group) { 1129 lu_gp->lu_gp_id = alua_lu_gps_counter++; 1130 lu_gp->lu_gp_valid_id = 1; 1131 alua_lu_gps_count++; 1132 } 1133 1134 return lu_gp; 1135 } 1136 1137 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) 1138 { 1139 struct t10_alua_lu_gp *lu_gp_tmp; 1140 u16 lu_gp_id_tmp; 1141 /* 1142 * The lu_gp->lu_gp_id may only be set once.. 1143 */ 1144 if (lu_gp->lu_gp_valid_id) { 1145 pr_warn("ALUA LU Group already has a valid ID," 1146 " ignoring request\n"); 1147 return -EINVAL; 1148 } 1149 1150 spin_lock(&lu_gps_lock); 1151 if (alua_lu_gps_count == 0x0000ffff) { 1152 pr_err("Maximum ALUA alua_lu_gps_count:" 1153 " 0x0000ffff reached\n"); 1154 spin_unlock(&lu_gps_lock); 1155 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1156 return -ENOSPC; 1157 } 1158 again: 1159 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : 1160 alua_lu_gps_counter++; 1161 1162 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { 1163 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { 1164 if (!lu_gp_id) 1165 goto again; 1166 1167 pr_warn("ALUA Logical Unit Group ID: %hu" 1168 " already exists, ignoring request\n", 1169 lu_gp_id); 1170 spin_unlock(&lu_gps_lock); 1171 return -EINVAL; 1172 } 1173 } 1174 1175 lu_gp->lu_gp_id = lu_gp_id_tmp; 1176 lu_gp->lu_gp_valid_id = 1; 1177 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); 1178 alua_lu_gps_count++; 1179 spin_unlock(&lu_gps_lock); 1180 1181 return 0; 1182 } 1183 1184 static struct t10_alua_lu_gp_member * 1185 core_alua_allocate_lu_gp_mem(struct se_device *dev) 1186 { 1187 struct t10_alua_lu_gp_member *lu_gp_mem; 1188 1189 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); 1190 if (!lu_gp_mem) { 1191 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); 1192 return ERR_PTR(-ENOMEM); 1193 } 1194 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); 1195 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); 1196 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); 1197 1198 lu_gp_mem->lu_gp_mem_dev = dev; 1199 dev->dev_alua_lu_gp_mem = lu_gp_mem; 1200 1201 return lu_gp_mem; 1202 } 1203 1204 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) 1205 { 1206 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; 1207 /* 1208 * Once we have reached this point, config_item_put() has 1209 * already been called from target_core_alua_drop_lu_gp(). 1210 * 1211 * Here, we remove the *lu_gp from the global list so that 1212 * no associations can be made while we are releasing 1213 * struct t10_alua_lu_gp. 1214 */ 1215 spin_lock(&lu_gps_lock); 1216 list_del(&lu_gp->lu_gp_node); 1217 alua_lu_gps_count--; 1218 spin_unlock(&lu_gps_lock); 1219 /* 1220 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() 1221 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be 1222 * released with core_alua_put_lu_gp_from_name() 1223 */ 1224 while (atomic_read(&lu_gp->lu_gp_ref_cnt)) 1225 cpu_relax(); 1226 /* 1227 * Release reference to struct t10_alua_lu_gp * from all associated 1228 * struct se_device. 1229 */ 1230 spin_lock(&lu_gp->lu_gp_lock); 1231 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, 1232 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { 1233 if (lu_gp_mem->lu_gp_assoc) { 1234 list_del(&lu_gp_mem->lu_gp_mem_list); 1235 lu_gp->lu_gp_members--; 1236 lu_gp_mem->lu_gp_assoc = 0; 1237 } 1238 spin_unlock(&lu_gp->lu_gp_lock); 1239 /* 1240 * 1241 * lu_gp_mem is associated with a single 1242 * struct se_device->dev_alua_lu_gp_mem, and is released when 1243 * struct se_device is released via core_alua_free_lu_gp_mem(). 1244 * 1245 * If the passed lu_gp does NOT match the default_lu_gp, assume 1246 * we want to re-assocate a given lu_gp_mem with default_lu_gp. 1247 */ 1248 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1249 if (lu_gp != default_lu_gp) 1250 __core_alua_attach_lu_gp_mem(lu_gp_mem, 1251 default_lu_gp); 1252 else 1253 lu_gp_mem->lu_gp = NULL; 1254 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1255 1256 spin_lock(&lu_gp->lu_gp_lock); 1257 } 1258 spin_unlock(&lu_gp->lu_gp_lock); 1259 1260 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); 1261 } 1262 1263 void core_alua_free_lu_gp_mem(struct se_device *dev) 1264 { 1265 struct t10_alua_lu_gp *lu_gp; 1266 struct t10_alua_lu_gp_member *lu_gp_mem; 1267 1268 lu_gp_mem = dev->dev_alua_lu_gp_mem; 1269 if (!lu_gp_mem) 1270 return; 1271 1272 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) 1273 cpu_relax(); 1274 1275 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 1276 lu_gp = lu_gp_mem->lu_gp; 1277 if (lu_gp) { 1278 spin_lock(&lu_gp->lu_gp_lock); 1279 if (lu_gp_mem->lu_gp_assoc) { 1280 list_del(&lu_gp_mem->lu_gp_mem_list); 1281 lu_gp->lu_gp_members--; 1282 lu_gp_mem->lu_gp_assoc = 0; 1283 } 1284 spin_unlock(&lu_gp->lu_gp_lock); 1285 lu_gp_mem->lu_gp = NULL; 1286 } 1287 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 1288 1289 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); 1290 } 1291 1292 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) 1293 { 1294 struct t10_alua_lu_gp *lu_gp; 1295 struct config_item *ci; 1296 1297 spin_lock(&lu_gps_lock); 1298 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { 1299 if (!lu_gp->lu_gp_valid_id) 1300 continue; 1301 ci = &lu_gp->lu_gp_group.cg_item; 1302 if (!strcmp(config_item_name(ci), name)) { 1303 atomic_inc(&lu_gp->lu_gp_ref_cnt); 1304 spin_unlock(&lu_gps_lock); 1305 return lu_gp; 1306 } 1307 } 1308 spin_unlock(&lu_gps_lock); 1309 1310 return NULL; 1311 } 1312 1313 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) 1314 { 1315 spin_lock(&lu_gps_lock); 1316 atomic_dec(&lu_gp->lu_gp_ref_cnt); 1317 spin_unlock(&lu_gps_lock); 1318 } 1319 1320 /* 1321 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1322 */ 1323 void __core_alua_attach_lu_gp_mem( 1324 struct t10_alua_lu_gp_member *lu_gp_mem, 1325 struct t10_alua_lu_gp *lu_gp) 1326 { 1327 spin_lock(&lu_gp->lu_gp_lock); 1328 lu_gp_mem->lu_gp = lu_gp; 1329 lu_gp_mem->lu_gp_assoc = 1; 1330 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); 1331 lu_gp->lu_gp_members++; 1332 spin_unlock(&lu_gp->lu_gp_lock); 1333 } 1334 1335 /* 1336 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock 1337 */ 1338 void __core_alua_drop_lu_gp_mem( 1339 struct t10_alua_lu_gp_member *lu_gp_mem, 1340 struct t10_alua_lu_gp *lu_gp) 1341 { 1342 spin_lock(&lu_gp->lu_gp_lock); 1343 list_del(&lu_gp_mem->lu_gp_mem_list); 1344 lu_gp_mem->lu_gp = NULL; 1345 lu_gp_mem->lu_gp_assoc = 0; 1346 lu_gp->lu_gp_members--; 1347 spin_unlock(&lu_gp->lu_gp_lock); 1348 } 1349 1350 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, 1351 const char *name, int def_group) 1352 { 1353 struct t10_alua_tg_pt_gp *tg_pt_gp; 1354 1355 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); 1356 if (!tg_pt_gp) { 1357 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); 1358 return NULL; 1359 } 1360 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); 1361 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); 1362 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); 1363 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); 1364 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); 1365 tg_pt_gp->tg_pt_gp_dev = dev; 1366 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; 1367 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, 1368 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); 1369 /* 1370 * Enable both explict and implict ALUA support by default 1371 */ 1372 tg_pt_gp->tg_pt_gp_alua_access_type = 1373 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; 1374 /* 1375 * Set the default Active/NonOptimized Delay in milliseconds 1376 */ 1377 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; 1378 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; 1379 tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; 1380 1381 if (def_group) { 1382 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1383 tg_pt_gp->tg_pt_gp_id = 1384 dev->t10_alua.alua_tg_pt_gps_counter++; 1385 tg_pt_gp->tg_pt_gp_valid_id = 1; 1386 dev->t10_alua.alua_tg_pt_gps_count++; 1387 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1388 &dev->t10_alua.tg_pt_gps_list); 1389 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1390 } 1391 1392 return tg_pt_gp; 1393 } 1394 1395 int core_alua_set_tg_pt_gp_id( 1396 struct t10_alua_tg_pt_gp *tg_pt_gp, 1397 u16 tg_pt_gp_id) 1398 { 1399 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1400 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; 1401 u16 tg_pt_gp_id_tmp; 1402 1403 /* 1404 * The tg_pt_gp->tg_pt_gp_id may only be set once.. 1405 */ 1406 if (tg_pt_gp->tg_pt_gp_valid_id) { 1407 pr_warn("ALUA TG PT Group already has a valid ID," 1408 " ignoring request\n"); 1409 return -EINVAL; 1410 } 1411 1412 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1413 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { 1414 pr_err("Maximum ALUA alua_tg_pt_gps_count:" 1415 " 0x0000ffff reached\n"); 1416 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1417 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1418 return -ENOSPC; 1419 } 1420 again: 1421 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : 1422 dev->t10_alua.alua_tg_pt_gps_counter++; 1423 1424 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, 1425 tg_pt_gp_list) { 1426 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { 1427 if (!tg_pt_gp_id) 1428 goto again; 1429 1430 pr_err("ALUA Target Port Group ID: %hu already" 1431 " exists, ignoring request\n", tg_pt_gp_id); 1432 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1433 return -EINVAL; 1434 } 1435 } 1436 1437 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; 1438 tg_pt_gp->tg_pt_gp_valid_id = 1; 1439 list_add_tail(&tg_pt_gp->tg_pt_gp_list, 1440 &dev->t10_alua.tg_pt_gps_list); 1441 dev->t10_alua.alua_tg_pt_gps_count++; 1442 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1443 1444 return 0; 1445 } 1446 1447 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( 1448 struct se_port *port) 1449 { 1450 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1451 1452 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, 1453 GFP_KERNEL); 1454 if (!tg_pt_gp_mem) { 1455 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); 1456 return ERR_PTR(-ENOMEM); 1457 } 1458 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1459 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1460 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); 1461 1462 tg_pt_gp_mem->tg_pt = port; 1463 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; 1464 1465 return tg_pt_gp_mem; 1466 } 1467 1468 void core_alua_free_tg_pt_gp( 1469 struct t10_alua_tg_pt_gp *tg_pt_gp) 1470 { 1471 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1472 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; 1473 1474 /* 1475 * Once we have reached this point, config_item_put() has already 1476 * been called from target_core_alua_drop_tg_pt_gp(). 1477 * 1478 * Here we remove *tg_pt_gp from the global list so that 1479 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS 1480 * can be made while we are releasing struct t10_alua_tg_pt_gp. 1481 */ 1482 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1483 list_del(&tg_pt_gp->tg_pt_gp_list); 1484 dev->t10_alua.alua_tg_pt_gps_counter--; 1485 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1486 1487 /* 1488 * Allow a struct t10_alua_tg_pt_gp_member * referenced by 1489 * core_alua_get_tg_pt_gp_by_name() in 1490 * target_core_configfs.c:target_core_store_alua_tg_pt_gp() 1491 * to be released with core_alua_put_tg_pt_gp_from_name(). 1492 */ 1493 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) 1494 cpu_relax(); 1495 1496 /* 1497 * Release reference to struct t10_alua_tg_pt_gp from all associated 1498 * struct se_port. 1499 */ 1500 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1501 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, 1502 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { 1503 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1504 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1505 tg_pt_gp->tg_pt_gp_members--; 1506 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1507 } 1508 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1509 /* 1510 * tg_pt_gp_mem is associated with a single 1511 * se_port->sep_alua_tg_pt_gp_mem, and is released via 1512 * core_alua_free_tg_pt_gp_mem(). 1513 * 1514 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, 1515 * assume we want to re-assocate a given tg_pt_gp_mem with 1516 * default_tg_pt_gp. 1517 */ 1518 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1519 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { 1520 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1521 dev->t10_alua.default_tg_pt_gp); 1522 } else 1523 tg_pt_gp_mem->tg_pt_gp = NULL; 1524 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1525 1526 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1527 } 1528 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1529 1530 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); 1531 } 1532 1533 void core_alua_free_tg_pt_gp_mem(struct se_port *port) 1534 { 1535 struct t10_alua_tg_pt_gp *tg_pt_gp; 1536 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1537 1538 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1539 if (!tg_pt_gp_mem) 1540 return; 1541 1542 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) 1543 cpu_relax(); 1544 1545 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1546 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1547 if (tg_pt_gp) { 1548 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1549 if (tg_pt_gp_mem->tg_pt_gp_assoc) { 1550 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1551 tg_pt_gp->tg_pt_gp_members--; 1552 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1553 } 1554 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1555 tg_pt_gp_mem->tg_pt_gp = NULL; 1556 } 1557 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1558 1559 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); 1560 } 1561 1562 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( 1563 struct se_device *dev, const char *name) 1564 { 1565 struct t10_alua_tg_pt_gp *tg_pt_gp; 1566 struct config_item *ci; 1567 1568 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1569 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, 1570 tg_pt_gp_list) { 1571 if (!tg_pt_gp->tg_pt_gp_valid_id) 1572 continue; 1573 ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1574 if (!strcmp(config_item_name(ci), name)) { 1575 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); 1576 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1577 return tg_pt_gp; 1578 } 1579 } 1580 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1581 1582 return NULL; 1583 } 1584 1585 static void core_alua_put_tg_pt_gp_from_name( 1586 struct t10_alua_tg_pt_gp *tg_pt_gp) 1587 { 1588 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; 1589 1590 spin_lock(&dev->t10_alua.tg_pt_gps_lock); 1591 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); 1592 spin_unlock(&dev->t10_alua.tg_pt_gps_lock); 1593 } 1594 1595 /* 1596 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1597 */ 1598 void __core_alua_attach_tg_pt_gp_mem( 1599 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1600 struct t10_alua_tg_pt_gp *tg_pt_gp) 1601 { 1602 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1603 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; 1604 tg_pt_gp_mem->tg_pt_gp_assoc = 1; 1605 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, 1606 &tg_pt_gp->tg_pt_gp_mem_list); 1607 tg_pt_gp->tg_pt_gp_members++; 1608 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1609 } 1610 1611 /* 1612 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held 1613 */ 1614 static void __core_alua_drop_tg_pt_gp_mem( 1615 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, 1616 struct t10_alua_tg_pt_gp *tg_pt_gp) 1617 { 1618 spin_lock(&tg_pt_gp->tg_pt_gp_lock); 1619 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); 1620 tg_pt_gp_mem->tg_pt_gp = NULL; 1621 tg_pt_gp_mem->tg_pt_gp_assoc = 0; 1622 tg_pt_gp->tg_pt_gp_members--; 1623 spin_unlock(&tg_pt_gp->tg_pt_gp_lock); 1624 } 1625 1626 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) 1627 { 1628 struct config_item *tg_pt_ci; 1629 struct t10_alua_tg_pt_gp *tg_pt_gp; 1630 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1631 ssize_t len = 0; 1632 1633 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1634 if (!tg_pt_gp_mem) 1635 return len; 1636 1637 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1638 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1639 if (tg_pt_gp) { 1640 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; 1641 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" 1642 " %hu\nTG Port Primary Access State: %s\nTG Port " 1643 "Primary Access Status: %s\nTG Port Secondary Access" 1644 " State: %s\nTG Port Secondary Access Status: %s\n", 1645 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, 1646 core_alua_dump_state(atomic_read( 1647 &tg_pt_gp->tg_pt_gp_alua_access_state)), 1648 core_alua_dump_status( 1649 tg_pt_gp->tg_pt_gp_alua_access_status), 1650 (atomic_read(&port->sep_tg_pt_secondary_offline)) ? 1651 "Offline" : "None", 1652 core_alua_dump_status(port->sep_tg_pt_secondary_stat)); 1653 } 1654 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1655 1656 return len; 1657 } 1658 1659 ssize_t core_alua_store_tg_pt_gp_info( 1660 struct se_port *port, 1661 const char *page, 1662 size_t count) 1663 { 1664 struct se_portal_group *tpg; 1665 struct se_lun *lun; 1666 struct se_device *dev = port->sep_lun->lun_se_dev; 1667 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; 1668 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1669 unsigned char buf[TG_PT_GROUP_NAME_BUF]; 1670 int move = 0; 1671 1672 tpg = port->sep_tpg; 1673 lun = port->sep_lun; 1674 1675 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 1676 if (!tg_pt_gp_mem) 1677 return 0; 1678 1679 if (count > TG_PT_GROUP_NAME_BUF) { 1680 pr_err("ALUA Target Port Group alias too large!\n"); 1681 return -EINVAL; 1682 } 1683 memset(buf, 0, TG_PT_GROUP_NAME_BUF); 1684 memcpy(buf, page, count); 1685 /* 1686 * Any ALUA target port group alias besides "NULL" means we will be 1687 * making a new group association. 1688 */ 1689 if (strcmp(strstrip(buf), "NULL")) { 1690 /* 1691 * core_alua_get_tg_pt_gp_by_name() will increment reference to 1692 * struct t10_alua_tg_pt_gp. This reference is released with 1693 * core_alua_put_tg_pt_gp_from_name() below. 1694 */ 1695 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, 1696 strstrip(buf)); 1697 if (!tg_pt_gp_new) 1698 return -ENODEV; 1699 } 1700 1701 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1702 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 1703 if (tg_pt_gp) { 1704 /* 1705 * Clearing an existing tg_pt_gp association, and replacing 1706 * with the default_tg_pt_gp. 1707 */ 1708 if (!tg_pt_gp_new) { 1709 pr_debug("Target_Core_ConfigFS: Moving" 1710 " %s/tpgt_%hu/%s from ALUA Target Port Group:" 1711 " alua/%s, ID: %hu back to" 1712 " default_tg_pt_gp\n", 1713 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1714 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1715 config_item_name(&lun->lun_group.cg_item), 1716 config_item_name( 1717 &tg_pt_gp->tg_pt_gp_group.cg_item), 1718 tg_pt_gp->tg_pt_gp_id); 1719 1720 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 1721 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, 1722 dev->t10_alua.default_tg_pt_gp); 1723 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1724 1725 return count; 1726 } 1727 /* 1728 * Removing existing association of tg_pt_gp_mem with tg_pt_gp 1729 */ 1730 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); 1731 move = 1; 1732 } 1733 /* 1734 * Associate tg_pt_gp_mem with tg_pt_gp_new. 1735 */ 1736 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); 1737 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 1738 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" 1739 " Target Port Group: alua/%s, ID: %hu\n", (move) ? 1740 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1741 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1742 config_item_name(&lun->lun_group.cg_item), 1743 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), 1744 tg_pt_gp_new->tg_pt_gp_id); 1745 1746 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); 1747 return count; 1748 } 1749 1750 ssize_t core_alua_show_access_type( 1751 struct t10_alua_tg_pt_gp *tg_pt_gp, 1752 char *page) 1753 { 1754 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && 1755 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) 1756 return sprintf(page, "Implict and Explict\n"); 1757 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) 1758 return sprintf(page, "Implict\n"); 1759 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) 1760 return sprintf(page, "Explict\n"); 1761 else 1762 return sprintf(page, "None\n"); 1763 } 1764 1765 ssize_t core_alua_store_access_type( 1766 struct t10_alua_tg_pt_gp *tg_pt_gp, 1767 const char *page, 1768 size_t count) 1769 { 1770 unsigned long tmp; 1771 int ret; 1772 1773 ret = strict_strtoul(page, 0, &tmp); 1774 if (ret < 0) { 1775 pr_err("Unable to extract alua_access_type\n"); 1776 return -EINVAL; 1777 } 1778 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { 1779 pr_err("Illegal value for alua_access_type:" 1780 " %lu\n", tmp); 1781 return -EINVAL; 1782 } 1783 if (tmp == 3) 1784 tg_pt_gp->tg_pt_gp_alua_access_type = 1785 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; 1786 else if (tmp == 2) 1787 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; 1788 else if (tmp == 1) 1789 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; 1790 else 1791 tg_pt_gp->tg_pt_gp_alua_access_type = 0; 1792 1793 return count; 1794 } 1795 1796 ssize_t core_alua_show_nonop_delay_msecs( 1797 struct t10_alua_tg_pt_gp *tg_pt_gp, 1798 char *page) 1799 { 1800 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); 1801 } 1802 1803 ssize_t core_alua_store_nonop_delay_msecs( 1804 struct t10_alua_tg_pt_gp *tg_pt_gp, 1805 const char *page, 1806 size_t count) 1807 { 1808 unsigned long tmp; 1809 int ret; 1810 1811 ret = strict_strtoul(page, 0, &tmp); 1812 if (ret < 0) { 1813 pr_err("Unable to extract nonop_delay_msecs\n"); 1814 return -EINVAL; 1815 } 1816 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { 1817 pr_err("Passed nonop_delay_msecs: %lu, exceeds" 1818 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, 1819 ALUA_MAX_NONOP_DELAY_MSECS); 1820 return -EINVAL; 1821 } 1822 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; 1823 1824 return count; 1825 } 1826 1827 ssize_t core_alua_show_trans_delay_msecs( 1828 struct t10_alua_tg_pt_gp *tg_pt_gp, 1829 char *page) 1830 { 1831 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); 1832 } 1833 1834 ssize_t core_alua_store_trans_delay_msecs( 1835 struct t10_alua_tg_pt_gp *tg_pt_gp, 1836 const char *page, 1837 size_t count) 1838 { 1839 unsigned long tmp; 1840 int ret; 1841 1842 ret = strict_strtoul(page, 0, &tmp); 1843 if (ret < 0) { 1844 pr_err("Unable to extract trans_delay_msecs\n"); 1845 return -EINVAL; 1846 } 1847 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { 1848 pr_err("Passed trans_delay_msecs: %lu, exceeds" 1849 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, 1850 ALUA_MAX_TRANS_DELAY_MSECS); 1851 return -EINVAL; 1852 } 1853 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; 1854 1855 return count; 1856 } 1857 1858 ssize_t core_alua_show_implict_trans_secs( 1859 struct t10_alua_tg_pt_gp *tg_pt_gp, 1860 char *page) 1861 { 1862 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); 1863 } 1864 1865 ssize_t core_alua_store_implict_trans_secs( 1866 struct t10_alua_tg_pt_gp *tg_pt_gp, 1867 const char *page, 1868 size_t count) 1869 { 1870 unsigned long tmp; 1871 int ret; 1872 1873 ret = strict_strtoul(page, 0, &tmp); 1874 if (ret < 0) { 1875 pr_err("Unable to extract implict_trans_secs\n"); 1876 return -EINVAL; 1877 } 1878 if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { 1879 pr_err("Passed implict_trans_secs: %lu, exceeds" 1880 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, 1881 ALUA_MAX_IMPLICT_TRANS_SECS); 1882 return -EINVAL; 1883 } 1884 tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; 1885 1886 return count; 1887 } 1888 1889 ssize_t core_alua_show_preferred_bit( 1890 struct t10_alua_tg_pt_gp *tg_pt_gp, 1891 char *page) 1892 { 1893 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); 1894 } 1895 1896 ssize_t core_alua_store_preferred_bit( 1897 struct t10_alua_tg_pt_gp *tg_pt_gp, 1898 const char *page, 1899 size_t count) 1900 { 1901 unsigned long tmp; 1902 int ret; 1903 1904 ret = strict_strtoul(page, 0, &tmp); 1905 if (ret < 0) { 1906 pr_err("Unable to extract preferred ALUA value\n"); 1907 return -EINVAL; 1908 } 1909 if ((tmp != 0) && (tmp != 1)) { 1910 pr_err("Illegal value for preferred ALUA: %lu\n", tmp); 1911 return -EINVAL; 1912 } 1913 tg_pt_gp->tg_pt_gp_pref = (int)tmp; 1914 1915 return count; 1916 } 1917 1918 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) 1919 { 1920 if (!lun->lun_sep) 1921 return -ENODEV; 1922 1923 return sprintf(page, "%d\n", 1924 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); 1925 } 1926 1927 ssize_t core_alua_store_offline_bit( 1928 struct se_lun *lun, 1929 const char *page, 1930 size_t count) 1931 { 1932 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 1933 unsigned long tmp; 1934 int ret; 1935 1936 if (!lun->lun_sep) 1937 return -ENODEV; 1938 1939 ret = strict_strtoul(page, 0, &tmp); 1940 if (ret < 0) { 1941 pr_err("Unable to extract alua_tg_pt_offline value\n"); 1942 return -EINVAL; 1943 } 1944 if ((tmp != 0) && (tmp != 1)) { 1945 pr_err("Illegal value for alua_tg_pt_offline: %lu\n", 1946 tmp); 1947 return -EINVAL; 1948 } 1949 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; 1950 if (!tg_pt_gp_mem) { 1951 pr_err("Unable to locate *tg_pt_gp_mem\n"); 1952 return -EINVAL; 1953 } 1954 1955 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, 1956 lun->lun_sep, 0, (int)tmp); 1957 if (ret < 0) 1958 return -EINVAL; 1959 1960 return count; 1961 } 1962 1963 ssize_t core_alua_show_secondary_status( 1964 struct se_lun *lun, 1965 char *page) 1966 { 1967 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); 1968 } 1969 1970 ssize_t core_alua_store_secondary_status( 1971 struct se_lun *lun, 1972 const char *page, 1973 size_t count) 1974 { 1975 unsigned long tmp; 1976 int ret; 1977 1978 ret = strict_strtoul(page, 0, &tmp); 1979 if (ret < 0) { 1980 pr_err("Unable to extract alua_tg_pt_status\n"); 1981 return -EINVAL; 1982 } 1983 if ((tmp != ALUA_STATUS_NONE) && 1984 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && 1985 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { 1986 pr_err("Illegal value for alua_tg_pt_status: %lu\n", 1987 tmp); 1988 return -EINVAL; 1989 } 1990 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; 1991 1992 return count; 1993 } 1994 1995 ssize_t core_alua_show_secondary_write_metadata( 1996 struct se_lun *lun, 1997 char *page) 1998 { 1999 return sprintf(page, "%d\n", 2000 lun->lun_sep->sep_tg_pt_secondary_write_md); 2001 } 2002 2003 ssize_t core_alua_store_secondary_write_metadata( 2004 struct se_lun *lun, 2005 const char *page, 2006 size_t count) 2007 { 2008 unsigned long tmp; 2009 int ret; 2010 2011 ret = strict_strtoul(page, 0, &tmp); 2012 if (ret < 0) { 2013 pr_err("Unable to extract alua_tg_pt_write_md\n"); 2014 return -EINVAL; 2015 } 2016 if ((tmp != 0) && (tmp != 1)) { 2017 pr_err("Illegal value for alua_tg_pt_write_md:" 2018 " %lu\n", tmp); 2019 return -EINVAL; 2020 } 2021 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; 2022 2023 return count; 2024 } 2025 2026 int core_setup_alua(struct se_device *dev) 2027 { 2028 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && 2029 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { 2030 struct t10_alua_lu_gp_member *lu_gp_mem; 2031 2032 /* 2033 * Associate this struct se_device with the default ALUA 2034 * LUN Group. 2035 */ 2036 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); 2037 if (IS_ERR(lu_gp_mem)) 2038 return PTR_ERR(lu_gp_mem); 2039 2040 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 2041 __core_alua_attach_lu_gp_mem(lu_gp_mem, 2042 default_lu_gp); 2043 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 2044 2045 pr_debug("%s: Adding to default ALUA LU Group:" 2046 " core/alua/lu_gps/default_lu_gp\n", 2047 dev->transport->name); 2048 } 2049 2050 return 0; 2051 } 2052