| 1 | |
| 2 | |
| 3 | * Filename: target_core_pr.c
|
| 4 | *
|
| 5 | * This file contains SPC-3 compliant persistent reservations and
|
| 6 | * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
|
| 7 | *
|
| 8 | * (c) Copyright 2009-2013 Datera, Inc.
|
| 9 | *
|
| 10 | * Nicholas A. Bellinger <[email protected]>
|
| 11 | *
|
| 12 | *****************************************************************************
|
| 13 |
|
| 14 | #include <linux/slab.h>
|
| 15 | #include <linux/spinlock.h>
|
| 16 | #include <linux/list.h>
|
| 17 | #include <linux/vmalloc.h>
|
| 18 | #include <linux/file.h>
|
| 19 | #include <linux/fcntl.h>
|
| 20 | #include <linux/fs.h>
|
| 21 | #include <linux/fs_struct.h>
|
| 22 | #include <scsi/scsi_proto.h>
|
| 23 | #include <linux/unaligned.h>
|
| 24 |
|
| 25 | #include <target/target_core_base.h>
|
| 26 | #include <target/target_core_backend.h>
|
| 27 | #include <target/target_core_fabric.h>
|
| 28 |
|
| 29 | #include "target_core_internal.h"
|
| 30 | #include "target_core_pr.h"
|
| 31 | #include "target_core_ua.h"
|
| 32 |
|
| 33 | |
| 34 | * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
|
| 35 |
|
| 36 | struct pr_transport_id_holder {
|
| 37 | struct t10_pr_registration *dest_pr_reg;
|
| 38 | struct se_portal_group *dest_tpg;
|
| 39 | struct se_node_acl *dest_node_acl;
|
| 40 | struct se_dev_entry *dest_se_deve;
|
| 41 | struct list_head dest_list;
|
| 42 | };
|
| 43 |
|
| 44 | void core_pr_dump_initiator_port(
|
| 45 | struct t10_pr_registration *pr_reg,
|
| 46 | char *buf,
|
| 47 | u32 size)
|
| 48 | {
|
| 49 | if (!pr_reg->isid_present_at_reg) {
|
| 50 | buf[0] = '\0';
|
| 51 | return;
|
| 52 | }
|
| 53 |
|
| 54 | snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
|
| 55 | }
|
| 56 |
|
| 57 | enum register_type {
|
| 58 | REGISTER,
|
| 59 | REGISTER_AND_IGNORE_EXISTING_KEY,
|
| 60 | REGISTER_AND_MOVE,
|
| 61 | };
|
| 62 |
|
| 63 | enum preempt_type {
|
| 64 | PREEMPT,
|
| 65 | PREEMPT_AND_ABORT,
|
| 66 | };
|
| 67 |
|
| 68 | static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
|
| 69 | struct t10_pr_registration *, int, int);
|
| 70 |
|
| 71 | static int is_reservation_holder(
|
| 72 | struct t10_pr_registration *pr_res_holder,
|
| 73 | struct t10_pr_registration *pr_reg)
|
| 74 | {
|
| 75 | int pr_res_type;
|
| 76 |
|
| 77 | if (pr_res_holder) {
|
| 78 | pr_res_type = pr_res_holder->pr_res_type;
|
| 79 |
|
| 80 | return pr_res_holder == pr_reg ||
|
| 81 | pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
|
| 82 | pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
|
| 83 | }
|
| 84 | return 0;
|
| 85 | }
|
| 86 |
|
| 87 | static sense_reason_t
|
| 88 | target_scsi2_reservation_check(struct se_cmd *cmd)
|
| 89 | {
|
| 90 | struct se_device *dev = cmd->se_dev;
|
| 91 | struct se_session *sess = cmd->se_sess;
|
| 92 |
|
| 93 | switch (cmd->t_task_cdb[0]) {
|
| 94 | case INQUIRY:
|
| 95 | case RELEASE_6:
|
| 96 | case RELEASE_10:
|
| 97 | return 0;
|
| 98 | default:
|
| 99 | break;
|
| 100 | }
|
| 101 |
|
| 102 | if (!dev->reservation_holder || !sess)
|
| 103 | return 0;
|
| 104 |
|
| 105 | if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
|
| 106 | return TCM_RESERVATION_CONFLICT;
|
| 107 |
|
| 108 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
|
| 109 | if (dev->dev_res_bin_isid != sess->sess_bin_isid)
|
| 110 | return TCM_RESERVATION_CONFLICT;
|
| 111 | }
|
| 112 |
|
| 113 | return 0;
|
| 114 | }
|
| 115 |
|
| 116 | static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
|
| 117 | struct se_node_acl *, struct se_session *);
|
| 118 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
|
| 119 |
|
| 120 | static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
|
| 121 | {
|
| 122 | struct se_session *se_sess = cmd->se_sess;
|
| 123 | struct se_device *dev = cmd->se_dev;
|
| 124 | struct t10_pr_registration *pr_reg;
|
| 125 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 126 | int conflict = 0;
|
| 127 |
|
| 128 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
| 129 | se_sess);
|
| 130 | if (pr_reg) {
|
| 131 | |
| 132 | * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
|
| 133 | * behavior
|
| 134 | *
|
| 135 | * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
|
| 136 | * status, but no reservation shall be established and the
|
| 137 | * persistent reservation shall not be changed, if the command
|
| 138 | * is received from a) and b) below.
|
| 139 | *
|
| 140 | * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
|
| 141 | * status, but the persistent reservation shall not be released,
|
| 142 | * if the command is received from a) and b)
|
| 143 | *
|
| 144 | * a) An I_T nexus that is a persistent reservation holder; or
|
| 145 | * b) An I_T nexus that is registered if a registrants only or
|
| 146 | * all registrants type persistent reservation is present.
|
| 147 | *
|
| 148 | * In all other cases, a RESERVE(6) command, RESERVE(10) command,
|
| 149 | * RELEASE(6) command, or RELEASE(10) command shall be processed
|
| 150 | * as defined in SPC-2.
|
| 151 |
|
| 152 | if (pr_reg->pr_res_holder) {
|
| 153 | core_scsi3_put_pr_reg(pr_reg);
|
| 154 | return 1;
|
| 155 | }
|
| 156 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
|
| 157 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
|
| 158 | (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
| 159 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
|
| 160 | core_scsi3_put_pr_reg(pr_reg);
|
| 161 | return 1;
|
| 162 | }
|
| 163 | core_scsi3_put_pr_reg(pr_reg);
|
| 164 | conflict = 1;
|
| 165 | } else {
|
| 166 | |
| 167 | * Following spc2r20 5.5.1 Reservations overview:
|
| 168 | *
|
| 169 | * If a logical unit has executed a PERSISTENT RESERVE OUT
|
| 170 | * command with the REGISTER or the REGISTER AND IGNORE
|
| 171 | * EXISTING KEY service action and is still registered by any
|
| 172 | * initiator, all RESERVE commands and all RELEASE commands
|
| 173 | * regardless of initiator shall conflict and shall terminate
|
| 174 | * with a RESERVATION CONFLICT status.
|
| 175 |
|
| 176 | spin_lock(&pr_tmpl->registration_lock);
|
| 177 | conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
|
| 178 | spin_unlock(&pr_tmpl->registration_lock);
|
| 179 | }
|
| 180 |
|
| 181 | if (conflict) {
|
| 182 | pr_err("Received legacy SPC-2 RESERVE/RELEASE"
|
| 183 | " while active SPC-3 registrations exist,"
|
| 184 | " returning RESERVATION_CONFLICT\n");
|
| 185 | return -EBUSY;
|
| 186 | }
|
| 187 |
|
| 188 | return 0;
|
| 189 | }
|
| 190 |
|
| 191 | void target_release_reservation(struct se_device *dev)
|
| 192 | {
|
| 193 | dev->reservation_holder = NULL;
|
| 194 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
|
| 195 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
|
| 196 | dev->dev_res_bin_isid = 0;
|
| 197 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
|
| 198 | }
|
| 199 | }
|
| 200 |
|
| 201 | sense_reason_t
|
| 202 | target_scsi2_reservation_release(struct se_cmd *cmd)
|
| 203 | {
|
| 204 | struct se_device *dev = cmd->se_dev;
|
| 205 | struct se_session *sess = cmd->se_sess;
|
| 206 | struct se_portal_group *tpg;
|
| 207 | int rc;
|
| 208 |
|
| 209 | if (!sess || !sess->se_tpg)
|
| 210 | goto out;
|
| 211 | rc = target_check_scsi2_reservation_conflict(cmd);
|
| 212 | if (rc == 1)
|
| 213 | goto out;
|
| 214 | if (rc < 0)
|
| 215 | return TCM_RESERVATION_CONFLICT;
|
| 216 |
|
| 217 | spin_lock(&dev->dev_reservation_lock);
|
| 218 | if (!dev->reservation_holder || !sess)
|
| 219 | goto out_unlock;
|
| 220 |
|
| 221 | if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
|
| 222 | goto out_unlock;
|
| 223 |
|
| 224 | if (dev->dev_res_bin_isid != sess->sess_bin_isid)
|
| 225 | goto out_unlock;
|
| 226 |
|
| 227 | target_release_reservation(dev);
|
| 228 | tpg = sess->se_tpg;
|
| 229 | pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
|
| 230 | " MAPPED LUN: %llu for %s\n",
|
| 231 | tpg->se_tpg_tfo->fabric_name,
|
| 232 | cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
|
| 233 | sess->se_node_acl->initiatorname);
|
| 234 |
|
| 235 | out_unlock:
|
| 236 | spin_unlock(&dev->dev_reservation_lock);
|
| 237 | out:
|
| 238 | target_complete_cmd(cmd, SAM_STAT_GOOD);
|
| 239 | return 0;
|
| 240 | }
|
| 241 |
|
| 242 | sense_reason_t
|
| 243 | target_scsi2_reservation_reserve(struct se_cmd *cmd)
|
| 244 | {
|
| 245 | struct se_device *dev = cmd->se_dev;
|
| 246 | struct se_session *sess = cmd->se_sess;
|
| 247 | struct se_portal_group *tpg;
|
| 248 | sense_reason_t ret = 0;
|
| 249 | int rc;
|
| 250 |
|
| 251 | if ((cmd->t_task_cdb[1] & 0x01) &&
|
| 252 | (cmd->t_task_cdb[1] & 0x02)) {
|
| 253 | pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
|
| 254 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 255 | }
|
| 256 | |
| 257 | * This is currently the case for target_core_mod passthrough struct se_cmd
|
| 258 | * ops
|
| 259 |
|
| 260 | if (!sess || !sess->se_tpg)
|
| 261 | goto out;
|
| 262 | rc = target_check_scsi2_reservation_conflict(cmd);
|
| 263 | if (rc == 1)
|
| 264 | goto out;
|
| 265 |
|
| 266 | if (rc < 0)
|
| 267 | return TCM_RESERVATION_CONFLICT;
|
| 268 |
|
| 269 | tpg = sess->se_tpg;
|
| 270 | spin_lock(&dev->dev_reservation_lock);
|
| 271 | if (dev->reservation_holder &&
|
| 272 | dev->reservation_holder->se_node_acl != sess->se_node_acl) {
|
| 273 | pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n",
|
| 274 | tpg->se_tpg_tfo->fabric_name);
|
| 275 | pr_err("Original reserver LUN: %llu %s\n",
|
| 276 | cmd->se_lun->unpacked_lun,
|
| 277 | dev->reservation_holder->se_node_acl->initiatorname);
|
| 278 | pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
|
| 279 | " from %s \n", cmd->se_lun->unpacked_lun,
|
| 280 | cmd->orig_fe_lun,
|
| 281 | sess->se_node_acl->initiatorname);
|
| 282 | ret = TCM_RESERVATION_CONFLICT;
|
| 283 | goto out_unlock;
|
| 284 | }
|
| 285 |
|
| 286 | dev->reservation_holder = sess;
|
| 287 | dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
|
| 288 | if (sess->sess_bin_isid != 0) {
|
| 289 | dev->dev_res_bin_isid = sess->sess_bin_isid;
|
| 290 | dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
|
| 291 | }
|
| 292 | pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
|
| 293 | " for %s\n", tpg->se_tpg_tfo->fabric_name,
|
| 294 | cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
|
| 295 | sess->se_node_acl->initiatorname);
|
| 296 |
|
| 297 | out_unlock:
|
| 298 | spin_unlock(&dev->dev_reservation_lock);
|
| 299 | out:
|
| 300 | if (!ret)
|
| 301 | target_complete_cmd(cmd, SAM_STAT_GOOD);
|
| 302 | return ret;
|
| 303 | }
|
| 304 |
|
| 305 |
|
| 306 | |
| 307 | * Begin SPC-3/SPC-4 Persistent Reservations emulation support
|
| 308 | *
|
| 309 | * This function is called by those initiator ports who are *NOT*
|
| 310 | * the active PR reservation holder when a reservation is present.
|
| 311 |
|
| 312 | static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
|
| 313 | bool isid_mismatch)
|
| 314 | {
|
| 315 | unsigned char *cdb = cmd->t_task_cdb;
|
| 316 | struct se_session *se_sess = cmd->se_sess;
|
| 317 | struct se_node_acl *nacl = se_sess->se_node_acl;
|
| 318 | int other_cdb = 0;
|
| 319 | int registered_nexus = 0, ret = 1;
|
| 320 | int all_reg = 0, reg_only = 0;
|
| 321 | int we = 0;
|
| 322 | int legacy = 0; |
| 323 | * RESERVATION CONFLICT on some CDBs
|
| 324 |
|
| 325 | if (isid_mismatch) {
|
| 326 | registered_nexus = 0;
|
| 327 | } else {
|
| 328 | struct se_dev_entry *se_deve;
|
| 329 |
|
| 330 | rcu_read_lock();
|
| 331 | se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
|
| 332 | if (se_deve)
|
| 333 | registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
|
| 334 | &se_deve->deve_flags);
|
| 335 | rcu_read_unlock();
|
| 336 | }
|
| 337 |
|
| 338 | switch (pr_reg_type) {
|
| 339 | case PR_TYPE_WRITE_EXCLUSIVE:
|
| 340 | we = 1;
|
| 341 | fallthrough;
|
| 342 | case PR_TYPE_EXCLUSIVE_ACCESS:
|
| 343 | |
| 344 | * Some commands are only allowed for the persistent reservation
|
| 345 | * holder.
|
| 346 |
|
| 347 | break;
|
| 348 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
| 349 | we = 1;
|
| 350 | fallthrough;
|
| 351 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
| 352 | |
| 353 | * Some commands are only allowed for registered I_T Nexuses.
|
| 354 |
|
| 355 | reg_only = 1;
|
| 356 | break;
|
| 357 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
| 358 | we = 1;
|
| 359 | fallthrough;
|
| 360 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
| 361 | |
| 362 | * Each registered I_T Nexus is a reservation holder.
|
| 363 |
|
| 364 | all_reg = 1;
|
| 365 | break;
|
| 366 | default:
|
| 367 | return -EINVAL;
|
| 368 | }
|
| 369 | |
| 370 | * Referenced from spc4r17 table 45 for *NON* PR holder access
|
| 371 |
|
| 372 | switch (cdb[0]) {
|
| 373 | case SECURITY_PROTOCOL_IN:
|
| 374 | if (registered_nexus)
|
| 375 | return 0;
|
| 376 | ret = (we) ? 0 : 1;
|
| 377 | break;
|
| 378 | case MODE_SENSE:
|
| 379 | case MODE_SENSE_10:
|
| 380 | case READ_ATTRIBUTE:
|
| 381 | case READ_BUFFER:
|
| 382 | case RECEIVE_DIAGNOSTIC:
|
| 383 | if (legacy) {
|
| 384 | ret = 1;
|
| 385 | break;
|
| 386 | }
|
| 387 | if (registered_nexus) {
|
| 388 | ret = 0;
|
| 389 | break;
|
| 390 | }
|
| 391 | ret = (we) ? 0 : 1;
|
| 392 | break;
|
| 393 | case PERSISTENT_RESERVE_OUT:
|
| 394 | |
| 395 | * This follows PERSISTENT_RESERVE_OUT service actions that
|
| 396 | * are allowed in the presence of various reservations.
|
| 397 | * See spc4r17, table 46
|
| 398 |
|
| 399 | switch (cdb[1] & 0x1f) {
|
| 400 | case PRO_CLEAR:
|
| 401 | case PRO_PREEMPT:
|
| 402 | case PRO_PREEMPT_AND_ABORT:
|
| 403 | ret = (registered_nexus) ? 0 : 1;
|
| 404 | break;
|
| 405 | case PRO_REGISTER:
|
| 406 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
|
| 407 | ret = 0;
|
| 408 | break;
|
| 409 | case PRO_REGISTER_AND_MOVE:
|
| 410 | case PRO_RESERVE:
|
| 411 | ret = 1;
|
| 412 | break;
|
| 413 | case PRO_RELEASE:
|
| 414 | ret = (registered_nexus) ? 0 : 1;
|
| 415 | break;
|
| 416 | default:
|
| 417 | pr_err("Unknown PERSISTENT_RESERVE_OUT service"
|
| 418 | " action: 0x%02x\n", cdb[1] & 0x1f);
|
| 419 | return -EINVAL;
|
| 420 | }
|
| 421 | break;
|
| 422 | case RELEASE_6:
|
| 423 | case RELEASE_10:
|
| 424 |
|
| 425 | ret = 0;
|
| 426 | break;
|
| 427 | case RESERVE_6:
|
| 428 | case RESERVE_10:
|
| 429 |
|
| 430 | ret = 0;
|
| 431 | break;
|
| 432 | case TEST_UNIT_READY:
|
| 433 | ret = (legacy) ? 1 : 0;
|
| 434 | break;
|
| 435 | case MAINTENANCE_IN:
|
| 436 | switch (cdb[1] & 0x1f) {
|
| 437 | case MI_MANAGEMENT_PROTOCOL_IN:
|
| 438 | if (registered_nexus) {
|
| 439 | ret = 0;
|
| 440 | break;
|
| 441 | }
|
| 442 | ret = (we) ? 0 : 1;
|
| 443 | break;
|
| 444 | case MI_REPORT_SUPPORTED_OPERATION_CODES:
|
| 445 | case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
|
| 446 | if (legacy) {
|
| 447 | ret = 1;
|
| 448 | break;
|
| 449 | }
|
| 450 | if (registered_nexus) {
|
| 451 | ret = 0;
|
| 452 | break;
|
| 453 | }
|
| 454 | ret = (we) ? 0 : 1;
|
| 455 | break;
|
| 456 | case MI_REPORT_ALIASES:
|
| 457 | case MI_REPORT_IDENTIFYING_INFORMATION:
|
| 458 | case MI_REPORT_PRIORITY:
|
| 459 | case MI_REPORT_TARGET_PGS:
|
| 460 | case MI_REPORT_TIMESTAMP:
|
| 461 | ret = 0;
|
| 462 | break;
|
| 463 | default:
|
| 464 | pr_err("Unknown MI Service Action: 0x%02x\n",
|
| 465 | (cdb[1] & 0x1f));
|
| 466 | return -EINVAL;
|
| 467 | }
|
| 468 | break;
|
| 469 | case ACCESS_CONTROL_IN:
|
| 470 | case ACCESS_CONTROL_OUT:
|
| 471 | case INQUIRY:
|
| 472 | case LOG_SENSE:
|
| 473 | case SERVICE_ACTION_IN_12:
|
| 474 | case READ_CAPACITY:
|
| 475 | case REPORT_LUNS:
|
| 476 | case REQUEST_SENSE:
|
| 477 | case PERSISTENT_RESERVE_IN:
|
| 478 | ret = 0;
|
| 479 | break;
|
| 480 | default:
|
| 481 | other_cdb = 1;
|
| 482 | break;
|
| 483 | }
|
| 484 | |
| 485 | * Case where the CDB is explicitly allowed in the above switch
|
| 486 | * statement.
|
| 487 |
|
| 488 | if (!ret && !other_cdb) {
|
| 489 | pr_debug("Allowing explicit CDB: 0x%02x for %s"
|
| 490 | " reservation holder\n", cdb[0],
|
| 491 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 492 |
|
| 493 | return ret;
|
| 494 | }
|
| 495 | |
| 496 | * Check if write exclusive initiator ports *NOT* holding the
|
| 497 | * WRITE_EXCLUSIVE_* reservation.
|
| 498 |
|
| 499 | if (we && !registered_nexus) {
|
| 500 | if (cmd->data_direction == DMA_TO_DEVICE) {
|
| 501 | |
| 502 | * Conflict for write exclusive
|
| 503 |
|
| 504 | pr_debug("%s Conflict for unregistered nexus"
|
| 505 | " %s CDB: 0x%02x to %s reservation\n",
|
| 506 | transport_dump_cmd_direction(cmd),
|
| 507 | se_sess->se_node_acl->initiatorname, cdb[0],
|
| 508 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 509 | return 1;
|
| 510 | } else {
|
| 511 | |
| 512 | * Allow non WRITE CDBs for all Write Exclusive
|
| 513 | * PR TYPEs to pass for registered and
|
| 514 | * non-registered_nexuxes NOT holding the reservation.
|
| 515 | *
|
| 516 | * We only make noise for the unregisterd nexuses,
|
| 517 | * as we expect registered non-reservation holding
|
| 518 | * nexuses to issue CDBs.
|
| 519 |
|
| 520 |
|
| 521 | if (!registered_nexus) {
|
| 522 | pr_debug("Allowing implicit CDB: 0x%02x"
|
| 523 | " for %s reservation on unregistered"
|
| 524 | " nexus\n", cdb[0],
|
| 525 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 526 | }
|
| 527 |
|
| 528 | return 0;
|
| 529 | }
|
| 530 | } else if ((reg_only) || (all_reg)) {
|
| 531 | if (registered_nexus) {
|
| 532 | |
| 533 | * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
|
| 534 | * allow commands from registered nexuses.
|
| 535 |
|
| 536 |
|
| 537 | pr_debug("Allowing implicit CDB: 0x%02x for %s"
|
| 538 | " reservation\n", cdb[0],
|
| 539 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 540 |
|
| 541 | return 0;
|
| 542 | }
|
| 543 | } else if (we && registered_nexus) {
|
| 544 | |
| 545 | * Reads are allowed for Write Exclusive locks
|
| 546 | * from all registrants.
|
| 547 |
|
| 548 | if (cmd->data_direction == DMA_FROM_DEVICE) {
|
| 549 | pr_debug("Allowing READ CDB: 0x%02x for %s"
|
| 550 | " reservation\n", cdb[0],
|
| 551 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 552 |
|
| 553 | return 0;
|
| 554 | }
|
| 555 | }
|
| 556 | pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
|
| 557 | " for %s reservation\n", transport_dump_cmd_direction(cmd),
|
| 558 | (registered_nexus) ? "" : "un",
|
| 559 | se_sess->se_node_acl->initiatorname, cdb[0],
|
| 560 | core_scsi3_pr_dump_type(pr_reg_type));
|
| 561 |
|
| 562 | return 1;
|
| 563 | }
|
| 564 |
|
| 565 | static sense_reason_t
|
| 566 | target_scsi3_pr_reservation_check(struct se_cmd *cmd)
|
| 567 | {
|
| 568 | struct se_device *dev = cmd->se_dev;
|
| 569 | struct se_session *sess = cmd->se_sess;
|
| 570 | u32 pr_reg_type;
|
| 571 | bool isid_mismatch = false;
|
| 572 |
|
| 573 | if (!dev->dev_pr_res_holder)
|
| 574 | return 0;
|
| 575 |
|
| 576 | pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
|
| 577 | cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
|
| 578 | if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
|
| 579 | goto check_nonholder;
|
| 580 |
|
| 581 | if (dev->dev_pr_res_holder->isid_present_at_reg) {
|
| 582 | if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
|
| 583 | sess->sess_bin_isid) {
|
| 584 | isid_mismatch = true;
|
| 585 | goto check_nonholder;
|
| 586 | }
|
| 587 | }
|
| 588 |
|
| 589 | return 0;
|
| 590 |
|
| 591 | check_nonholder:
|
| 592 | if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
|
| 593 | return TCM_RESERVATION_CONFLICT;
|
| 594 | return 0;
|
| 595 | }
|
| 596 |
|
| 597 | static u32 core_scsi3_pr_generation(struct se_device *dev)
|
| 598 | {
|
| 599 | u32 prg;
|
| 600 |
|
| 601 | |
| 602 | * PRGeneration field shall contain the value of a 32-bit wrapping
|
| 603 | * counter mainted by the device server.
|
| 604 | *
|
| 605 | * Note that this is done regardless of Active Persist across
|
| 606 | * Target PowerLoss (APTPL)
|
| 607 | *
|
| 608 | * See spc4r17 section 6.3.12 READ_KEYS service action
|
| 609 |
|
| 610 | spin_lock(&dev->dev_reservation_lock);
|
| 611 | prg = dev->t10_pr.pr_generation++;
|
| 612 | spin_unlock(&dev->dev_reservation_lock);
|
| 613 |
|
| 614 | return prg;
|
| 615 | }
|
| 616 |
|
| 617 | static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
|
| 618 | struct se_device *dev,
|
| 619 | struct se_node_acl *nacl,
|
| 620 | struct se_lun *lun,
|
| 621 | struct se_dev_entry *dest_deve,
|
| 622 | u64 mapped_lun,
|
| 623 | unsigned char *isid,
|
| 624 | u64 sa_res_key,
|
| 625 | int all_tg_pt,
|
| 626 | int aptpl)
|
| 627 | {
|
| 628 | struct t10_pr_registration *pr_reg;
|
| 629 |
|
| 630 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
|
| 631 | if (!pr_reg) {
|
| 632 | pr_err("Unable to allocate struct t10_pr_registration\n");
|
| 633 | return NULL;
|
| 634 | }
|
| 635 |
|
| 636 | INIT_LIST_HEAD(&pr_reg->pr_reg_list);
|
| 637 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
|
| 638 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
|
| 639 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
|
| 640 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
|
| 641 | atomic_set(&pr_reg->pr_res_holders, 0);
|
| 642 | pr_reg->pr_reg_nacl = nacl;
|
| 643 | |
| 644 | * For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
|
| 645 | * the se_dev_entry->pr_ref will have been already obtained by
|
| 646 | * core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
|
| 647 | *
|
| 648 | * Otherwise, locate se_dev_entry now and obtain a reference until
|
| 649 | * registration completes in __core_scsi3_add_registration().
|
| 650 |
|
| 651 | if (dest_deve) {
|
| 652 | pr_reg->pr_reg_deve = dest_deve;
|
| 653 | } else {
|
| 654 | rcu_read_lock();
|
| 655 | pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
|
| 656 | if (!pr_reg->pr_reg_deve) {
|
| 657 | rcu_read_unlock();
|
| 658 | pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
|
| 659 | nacl->initiatorname, mapped_lun);
|
| 660 | kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
| 661 | return NULL;
|
| 662 | }
|
| 663 | kref_get(&pr_reg->pr_reg_deve->pr_kref);
|
| 664 | rcu_read_unlock();
|
| 665 | }
|
| 666 | pr_reg->pr_res_mapped_lun = mapped_lun;
|
| 667 | pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
|
| 668 | pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
|
| 669 | pr_reg->pr_res_key = sa_res_key;
|
| 670 | pr_reg->pr_reg_all_tg_pt = all_tg_pt;
|
| 671 | pr_reg->pr_reg_aptpl = aptpl;
|
| 672 | |
| 673 | * If an ISID value for this SCSI Initiator Port exists,
|
| 674 | * save it to the registration now.
|
| 675 |
|
| 676 | if (isid != NULL) {
|
| 677 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
|
| 678 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
|
| 679 | pr_reg->isid_present_at_reg = 1;
|
| 680 | }
|
| 681 |
|
| 682 | return pr_reg;
|
| 683 | }
|
| 684 |
|
| 685 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
|
| 686 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
|
| 687 |
|
| 688 | |
| 689 | * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
|
| 690 | * modes.
|
| 691 |
|
| 692 | static struct t10_pr_registration *__core_scsi3_alloc_registration(
|
| 693 | struct se_device *dev,
|
| 694 | struct se_node_acl *nacl,
|
| 695 | struct se_lun *lun,
|
| 696 | struct se_dev_entry *deve,
|
| 697 | u64 mapped_lun,
|
| 698 | unsigned char *isid,
|
| 699 | u64 sa_res_key,
|
| 700 | int all_tg_pt,
|
| 701 | int aptpl)
|
| 702 | {
|
| 703 | struct se_dev_entry *deve_tmp;
|
| 704 | struct se_node_acl *nacl_tmp;
|
| 705 | struct se_lun_acl *lacl_tmp;
|
| 706 | struct se_lun *lun_tmp, *next, *dest_lun;
|
| 707 | const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
| 708 | struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
|
| 709 | int ret;
|
| 710 | |
| 711 | * Create a registration for the I_T Nexus upon which the
|
| 712 | * PROUT REGISTER was received.
|
| 713 |
|
| 714 | pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
|
| 715 | isid, sa_res_key, all_tg_pt,
|
| 716 | aptpl);
|
| 717 | if (!pr_reg)
|
| 718 | return NULL;
|
| 719 | |
| 720 | * Return pointer to pr_reg for ALL_TG_PT=0
|
| 721 |
|
| 722 | if (!all_tg_pt)
|
| 723 | return pr_reg;
|
| 724 | |
| 725 | * Create list of matching SCSI Initiator Port registrations
|
| 726 | * for ALL_TG_PT=1
|
| 727 |
|
| 728 | spin_lock(&dev->se_port_lock);
|
| 729 | list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
|
| 730 | if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
|
| 731 | continue;
|
| 732 | spin_unlock(&dev->se_port_lock);
|
| 733 |
|
| 734 | spin_lock(&lun_tmp->lun_deve_lock);
|
| 735 | list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
|
| 736 | |
| 737 | * This pointer will be NULL for demo mode MappedLUNs
|
| 738 | * that have not been make explicit via a ConfigFS
|
| 739 | * MappedLUN group for the SCSI Initiator Node ACL.
|
| 740 |
|
| 741 | if (!deve_tmp->se_lun_acl)
|
| 742 | continue;
|
| 743 |
|
| 744 | lacl_tmp = deve_tmp->se_lun_acl;
|
| 745 | nacl_tmp = lacl_tmp->se_lun_nacl;
|
| 746 | |
| 747 | * Skip the matching struct se_node_acl that is allocated
|
| 748 | * above..
|
| 749 |
|
| 750 | if (nacl == nacl_tmp)
|
| 751 | continue;
|
| 752 | |
| 753 | * Only perform PR registrations for target ports on
|
| 754 | * the same fabric module as the REGISTER w/ ALL_TG_PT=1
|
| 755 | * arrived.
|
| 756 |
|
| 757 | if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
|
| 758 | continue;
|
| 759 | |
| 760 | * Look for a matching Initiator Node ACL in ASCII format
|
| 761 |
|
| 762 | if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
|
| 763 | continue;
|
| 764 |
|
| 765 | kref_get(&deve_tmp->pr_kref);
|
| 766 | spin_unlock(&lun_tmp->lun_deve_lock);
|
| 767 | |
| 768 | * Grab a configfs group dependency that is released
|
| 769 | * for the exception path at label out: below, or upon
|
| 770 | * completion of adding ALL_TG_PT=1 registrations in
|
| 771 | * __core_scsi3_add_registration()
|
| 772 |
|
| 773 | ret = core_scsi3_lunacl_depend_item(deve_tmp);
|
| 774 | if (ret < 0) {
|
| 775 | pr_err("core_scsi3_lunacl_depend"
|
| 776 | "_item() failed\n");
|
| 777 | percpu_ref_put(&lun_tmp->lun_ref);
|
| 778 | kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
|
| 779 | goto out;
|
| 780 | }
|
| 781 | |
| 782 | * Located a matching SCSI Initiator Port on a different
|
| 783 | * port, allocate the pr_reg_atp and attach it to the
|
| 784 | * pr_reg->pr_reg_atp_list that will be processed once
|
| 785 | * the original *pr_reg is processed in
|
| 786 | * __core_scsi3_add_registration()
|
| 787 |
|
| 788 | dest_lun = deve_tmp->se_lun;
|
| 789 |
|
| 790 | pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
|
| 791 | nacl_tmp, dest_lun, deve_tmp,
|
| 792 | deve_tmp->mapped_lun, NULL,
|
| 793 | sa_res_key, all_tg_pt, aptpl);
|
| 794 | if (!pr_reg_atp) {
|
| 795 | percpu_ref_put(&lun_tmp->lun_ref);
|
| 796 | core_scsi3_lunacl_undepend_item(deve_tmp);
|
| 797 | goto out;
|
| 798 | }
|
| 799 |
|
| 800 | list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
|
| 801 | &pr_reg->pr_reg_atp_list);
|
| 802 | spin_lock(&lun_tmp->lun_deve_lock);
|
| 803 | }
|
| 804 | spin_unlock(&lun_tmp->lun_deve_lock);
|
| 805 |
|
| 806 | spin_lock(&dev->se_port_lock);
|
| 807 | percpu_ref_put(&lun_tmp->lun_ref);
|
| 808 | }
|
| 809 | spin_unlock(&dev->se_port_lock);
|
| 810 |
|
| 811 | return pr_reg;
|
| 812 | out:
|
| 813 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
| 814 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
|
| 815 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
| 816 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
|
| 817 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
|
| 818 | }
|
| 819 | kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
| 820 | return NULL;
|
| 821 | }
|
| 822 |
|
| 823 | int core_scsi3_alloc_aptpl_registration(
|
| 824 | struct t10_reservation *pr_tmpl,
|
| 825 | u64 sa_res_key,
|
| 826 | unsigned char *i_port,
|
| 827 | unsigned char *isid,
|
| 828 | u64 mapped_lun,
|
| 829 | unsigned char *t_port,
|
| 830 | u16 tpgt,
|
| 831 | u64 target_lun,
|
| 832 | int res_holder,
|
| 833 | int all_tg_pt,
|
| 834 | u8 type)
|
| 835 | {
|
| 836 | struct t10_pr_registration *pr_reg;
|
| 837 |
|
| 838 | if (!i_port || !t_port || !sa_res_key) {
|
| 839 | pr_err("Illegal parameters for APTPL registration\n");
|
| 840 | return -EINVAL;
|
| 841 | }
|
| 842 |
|
| 843 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
|
| 844 | if (!pr_reg) {
|
| 845 | pr_err("Unable to allocate struct t10_pr_registration\n");
|
| 846 | return -ENOMEM;
|
| 847 | }
|
| 848 |
|
| 849 | INIT_LIST_HEAD(&pr_reg->pr_reg_list);
|
| 850 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
|
| 851 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
|
| 852 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
|
| 853 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
|
| 854 | atomic_set(&pr_reg->pr_res_holders, 0);
|
| 855 | pr_reg->pr_reg_nacl = NULL;
|
| 856 | pr_reg->pr_reg_deve = NULL;
|
| 857 | pr_reg->pr_res_mapped_lun = mapped_lun;
|
| 858 | pr_reg->pr_aptpl_target_lun = target_lun;
|
| 859 | pr_reg->pr_res_key = sa_res_key;
|
| 860 | pr_reg->pr_reg_all_tg_pt = all_tg_pt;
|
| 861 | pr_reg->pr_reg_aptpl = 1;
|
| 862 | pr_reg->pr_res_scope = 0;
|
| 863 | pr_reg->pr_res_type = type;
|
| 864 | |
| 865 | * If an ISID value had been saved in APTPL metadata for this
|
| 866 | * SCSI Initiator Port, restore it now.
|
| 867 |
|
| 868 | if (isid != NULL) {
|
| 869 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
|
| 870 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
|
| 871 | pr_reg->isid_present_at_reg = 1;
|
| 872 | }
|
| 873 | |
| 874 | * Copy the i_port and t_port information from caller.
|
| 875 |
|
| 876 | snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
|
| 877 | snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
|
| 878 | pr_reg->pr_reg_tpgt = tpgt;
|
| 879 | |
| 880 | * Set pr_res_holder from caller, the pr_reg who is the reservation
|
| 881 | * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
|
| 882 | * the Initiator Node LUN ACL from the fabric module is created for
|
| 883 | * this registration.
|
| 884 |
|
| 885 | pr_reg->pr_res_holder = res_holder;
|
| 886 |
|
| 887 | list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
|
| 888 | pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
|
| 889 | " metadata\n", (res_holder) ? "+reservation" : "");
|
| 890 | return 0;
|
| 891 | }
|
| 892 |
|
| 893 | static void core_scsi3_aptpl_reserve(
|
| 894 | struct se_device *dev,
|
| 895 | struct se_portal_group *tpg,
|
| 896 | struct se_node_acl *node_acl,
|
| 897 | struct t10_pr_registration *pr_reg)
|
| 898 | {
|
| 899 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 900 |
|
| 901 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 902 |
|
| 903 | spin_lock(&dev->dev_reservation_lock);
|
| 904 | dev->dev_pr_res_holder = pr_reg;
|
| 905 | spin_unlock(&dev->dev_reservation_lock);
|
| 906 |
|
| 907 | pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
|
| 908 | " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
| 909 | tpg->se_tpg_tfo->fabric_name,
|
| 910 | core_scsi3_pr_dump_type(pr_reg->pr_res_type),
|
| 911 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
| 912 | pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
|
| 913 | tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname,
|
| 914 | i_buf);
|
| 915 | }
|
| 916 |
|
| 917 | static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
|
| 918 | struct t10_pr_registration *, enum register_type, int);
|
| 919 |
|
| 920 | static int __core_scsi3_check_aptpl_registration(
|
| 921 | struct se_device *dev,
|
| 922 | struct se_portal_group *tpg,
|
| 923 | struct se_lun *lun,
|
| 924 | u64 target_lun,
|
| 925 | struct se_node_acl *nacl,
|
| 926 | u64 mapped_lun)
|
| 927 | {
|
| 928 | struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
| 929 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 930 | unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };
|
| 931 | unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };
|
| 932 | u16 tpgt;
|
| 933 |
|
| 934 | |
| 935 | * Copy Initiator Port information from struct se_node_acl
|
| 936 |
|
| 937 | snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
|
| 938 | snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
|
| 939 | tpg->se_tpg_tfo->tpg_get_wwn(tpg));
|
| 940 | tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
|
| 941 | |
| 942 | * Look for the matching registrations+reservation from those
|
| 943 | * created from APTPL metadata. Note that multiple registrations
|
| 944 | * may exist for fabrics that use ISIDs in their SCSI Initiator Port
|
| 945 | * TransportIDs.
|
| 946 |
|
| 947 | spin_lock(&pr_tmpl->aptpl_reg_lock);
|
| 948 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
|
| 949 | pr_reg_aptpl_list) {
|
| 950 |
|
| 951 | if (!strcmp(pr_reg->pr_iport, i_port) &&
|
| 952 | (pr_reg->pr_res_mapped_lun == mapped_lun) &&
|
| 953 | !(strcmp(pr_reg->pr_tport, t_port)) &&
|
| 954 | (pr_reg->pr_reg_tpgt == tpgt) &&
|
| 955 | (pr_reg->pr_aptpl_target_lun == target_lun)) {
|
| 956 | |
| 957 | * Obtain the ->pr_reg_deve pointer + reference, that
|
| 958 | * is released by __core_scsi3_add_registration() below.
|
| 959 |
|
| 960 | rcu_read_lock();
|
| 961 | pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
|
| 962 | if (!pr_reg->pr_reg_deve) {
|
| 963 | pr_err("Unable to locate PR APTPL %s mapped_lun:"
|
| 964 | " %llu\n", nacl->initiatorname, mapped_lun);
|
| 965 | rcu_read_unlock();
|
| 966 | continue;
|
| 967 | }
|
| 968 | kref_get(&pr_reg->pr_reg_deve->pr_kref);
|
| 969 | rcu_read_unlock();
|
| 970 |
|
| 971 | pr_reg->pr_reg_nacl = nacl;
|
| 972 | pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
|
| 973 | list_del(&pr_reg->pr_reg_aptpl_list);
|
| 974 | spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
| 975 | |
| 976 | * At this point all of the pointers in *pr_reg will
|
| 977 | * be setup, so go ahead and add the registration.
|
| 978 |
|
| 979 | __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
|
| 980 | |
| 981 | * If this registration is the reservation holder,
|
| 982 | * make that happen now..
|
| 983 |
|
| 984 | if (pr_reg->pr_res_holder)
|
| 985 | core_scsi3_aptpl_reserve(dev, tpg,
|
| 986 | nacl, pr_reg);
|
| 987 | |
| 988 | * Reenable pr_aptpl_active to accept new metadata
|
| 989 | * updates once the SCSI device is active again..
|
| 990 |
|
| 991 | spin_lock(&pr_tmpl->aptpl_reg_lock);
|
| 992 | pr_tmpl->pr_aptpl_active = 1;
|
| 993 | }
|
| 994 | }
|
| 995 | spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
| 996 |
|
| 997 | return 0;
|
| 998 | }
|
| 999 |
|
| 1000 | int core_scsi3_check_aptpl_registration(
|
| 1001 | struct se_device *dev,
|
| 1002 | struct se_portal_group *tpg,
|
| 1003 | struct se_lun *lun,
|
| 1004 | struct se_node_acl *nacl,
|
| 1005 | u64 mapped_lun)
|
| 1006 | {
|
| 1007 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
|
| 1008 | return 0;
|
| 1009 |
|
| 1010 | return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
|
| 1011 | lun->unpacked_lun, nacl,
|
| 1012 | mapped_lun);
|
| 1013 | }
|
| 1014 |
|
| 1015 | static void __core_scsi3_dump_registration(
|
| 1016 | const struct target_core_fabric_ops *tfo,
|
| 1017 | struct se_device *dev,
|
| 1018 | struct se_node_acl *nacl,
|
| 1019 | struct t10_pr_registration *pr_reg,
|
| 1020 | enum register_type register_type)
|
| 1021 | {
|
| 1022 | struct se_portal_group *se_tpg = nacl->se_tpg;
|
| 1023 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 1024 |
|
| 1025 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 1026 |
|
| 1027 | pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
|
| 1028 | " Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?
|
| 1029 | "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
|
| 1030 | "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
|
| 1031 | i_buf);
|
| 1032 | pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
|
| 1033 | tfo->fabric_name, tfo->tpg_get_wwn(se_tpg),
|
| 1034 | tfo->tpg_get_tag(se_tpg));
|
| 1035 | pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
|
| 1036 | " Port(s)\n", tfo->fabric_name,
|
| 1037 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
|
| 1038 | dev->transport->name);
|
| 1039 | pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
|
| 1040 | " 0x%08x APTPL: %d\n", tfo->fabric_name,
|
| 1041 | pr_reg->pr_res_key, pr_reg->pr_res_generation,
|
| 1042 | pr_reg->pr_reg_aptpl);
|
| 1043 | }
|
| 1044 |
|
| 1045 | static void __core_scsi3_add_registration(
|
| 1046 | struct se_device *dev,
|
| 1047 | struct se_node_acl *nacl,
|
| 1048 | struct t10_pr_registration *pr_reg,
|
| 1049 | enum register_type register_type,
|
| 1050 | int register_move)
|
| 1051 | {
|
| 1052 | const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
| 1053 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
|
| 1054 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 1055 | struct se_dev_entry *deve;
|
| 1056 |
|
| 1057 | |
| 1058 | * Increment PRgeneration counter for struct se_device upon a successful
|
| 1059 | * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
|
| 1060 | *
|
| 1061 | * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
|
| 1062 | * action, the struct se_device->dev_reservation_lock will already be held,
|
| 1063 | * so we do not call core_scsi3_pr_generation() which grabs the lock
|
| 1064 | * for the REGISTER.
|
| 1065 |
|
| 1066 | pr_reg->pr_res_generation = (register_move) ?
|
| 1067 | dev->t10_pr.pr_generation++ :
|
| 1068 | core_scsi3_pr_generation(dev);
|
| 1069 |
|
| 1070 | spin_lock(&pr_tmpl->registration_lock);
|
| 1071 | list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
|
| 1072 |
|
| 1073 | __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
|
| 1074 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1075 | |
| 1076 | * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
|
| 1077 |
|
| 1078 | if (!pr_reg->pr_reg_all_tg_pt || register_move)
|
| 1079 | goto out;
|
| 1080 | |
| 1081 | * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
|
| 1082 | * allocated in __core_scsi3_alloc_registration()
|
| 1083 |
|
| 1084 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
| 1085 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
|
| 1086 | struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
|
| 1087 |
|
| 1088 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
| 1089 |
|
| 1090 | pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
|
| 1091 |
|
| 1092 | spin_lock(&pr_tmpl->registration_lock);
|
| 1093 | list_add_tail(&pr_reg_tmp->pr_reg_list,
|
| 1094 | &pr_tmpl->registration_list);
|
| 1095 |
|
| 1096 | __core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
|
| 1097 | register_type);
|
| 1098 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1099 | |
| 1100 | * Drop configfs group dependency reference and deve->pr_kref
|
| 1101 | * obtained from __core_scsi3_alloc_registration() code.
|
| 1102 |
|
| 1103 | rcu_read_lock();
|
| 1104 | deve = pr_reg_tmp->pr_reg_deve;
|
| 1105 | if (deve) {
|
| 1106 | set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
| 1107 | core_scsi3_lunacl_undepend_item(deve);
|
| 1108 | pr_reg_tmp->pr_reg_deve = NULL;
|
| 1109 | }
|
| 1110 | rcu_read_unlock();
|
| 1111 | }
|
| 1112 | out:
|
| 1113 | |
| 1114 | * Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
|
| 1115 |
|
| 1116 | rcu_read_lock();
|
| 1117 | deve = pr_reg->pr_reg_deve;
|
| 1118 | if (deve) {
|
| 1119 | set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
| 1120 | kref_put(&deve->pr_kref, target_pr_kref_release);
|
| 1121 | pr_reg->pr_reg_deve = NULL;
|
| 1122 | }
|
| 1123 | rcu_read_unlock();
|
| 1124 | }
|
| 1125 |
|
| 1126 | static int core_scsi3_alloc_registration(
|
| 1127 | struct se_device *dev,
|
| 1128 | struct se_node_acl *nacl,
|
| 1129 | struct se_lun *lun,
|
| 1130 | struct se_dev_entry *deve,
|
| 1131 | u64 mapped_lun,
|
| 1132 | unsigned char *isid,
|
| 1133 | u64 sa_res_key,
|
| 1134 | int all_tg_pt,
|
| 1135 | int aptpl,
|
| 1136 | enum register_type register_type,
|
| 1137 | int register_move)
|
| 1138 | {
|
| 1139 | struct t10_pr_registration *pr_reg;
|
| 1140 |
|
| 1141 | pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
|
| 1142 | isid, sa_res_key, all_tg_pt,
|
| 1143 | aptpl);
|
| 1144 | if (!pr_reg)
|
| 1145 | return -EPERM;
|
| 1146 |
|
| 1147 | __core_scsi3_add_registration(dev, nacl, pr_reg,
|
| 1148 | register_type, register_move);
|
| 1149 | return 0;
|
| 1150 | }
|
| 1151 |
|
| 1152 | static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
|
| 1153 | struct se_device *dev,
|
| 1154 | struct se_node_acl *nacl,
|
| 1155 | unsigned char *isid)
|
| 1156 | {
|
| 1157 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 1158 | struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
| 1159 |
|
| 1160 | spin_lock(&pr_tmpl->registration_lock);
|
| 1161 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 1162 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 1163 | |
| 1164 | * First look for a matching struct se_node_acl
|
| 1165 |
|
| 1166 | if (pr_reg->pr_reg_nacl != nacl)
|
| 1167 | continue;
|
| 1168 |
|
| 1169 | |
| 1170 | * If this registration does NOT contain a fabric provided
|
| 1171 | * ISID, then we have found a match.
|
| 1172 |
|
| 1173 | if (!pr_reg->isid_present_at_reg) {
|
| 1174 | atomic_inc_mb(&pr_reg->pr_res_holders);
|
| 1175 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1176 | return pr_reg;
|
| 1177 | }
|
| 1178 | |
| 1179 | * If the *pr_reg contains a fabric defined ISID for multi-value
|
| 1180 | * SCSI Initiator Port TransportIDs, then we expect a valid
|
| 1181 | * matching ISID to be provided by the local SCSI Initiator Port.
|
| 1182 |
|
| 1183 | if (!isid)
|
| 1184 | continue;
|
| 1185 | if (strcmp(isid, pr_reg->pr_reg_isid))
|
| 1186 | continue;
|
| 1187 |
|
| 1188 | atomic_inc_mb(&pr_reg->pr_res_holders);
|
| 1189 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1190 | return pr_reg;
|
| 1191 | }
|
| 1192 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1193 |
|
| 1194 | return NULL;
|
| 1195 | }
|
| 1196 |
|
| 1197 | static struct t10_pr_registration *core_scsi3_locate_pr_reg(
|
| 1198 | struct se_device *dev,
|
| 1199 | struct se_node_acl *nacl,
|
| 1200 | struct se_session *sess)
|
| 1201 | {
|
| 1202 | struct se_portal_group *tpg = nacl->se_tpg;
|
| 1203 | unsigned char buf[PR_REG_ISID_LEN] = { };
|
| 1204 | unsigned char *isid_ptr = NULL;
|
| 1205 |
|
| 1206 | if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
|
| 1207 | tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
|
| 1208 | PR_REG_ISID_LEN);
|
| 1209 | isid_ptr = &buf[0];
|
| 1210 | }
|
| 1211 |
|
| 1212 | return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
|
| 1213 | }
|
| 1214 |
|
| 1215 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
|
| 1216 | {
|
| 1217 | atomic_dec_mb(&pr_reg->pr_res_holders);
|
| 1218 | }
|
| 1219 |
|
| 1220 | static int core_scsi3_check_implicit_release(
|
| 1221 | struct se_device *dev,
|
| 1222 | struct t10_pr_registration *pr_reg)
|
| 1223 | {
|
| 1224 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
| 1225 | struct t10_pr_registration *pr_res_holder;
|
| 1226 | int ret = 0;
|
| 1227 |
|
| 1228 | spin_lock(&dev->dev_reservation_lock);
|
| 1229 | pr_res_holder = dev->dev_pr_res_holder;
|
| 1230 | if (!pr_res_holder) {
|
| 1231 | spin_unlock(&dev->dev_reservation_lock);
|
| 1232 | return ret;
|
| 1233 | }
|
| 1234 | if (pr_res_holder == pr_reg) {
|
| 1235 | |
| 1236 | * Perform an implicit RELEASE if the registration that
|
| 1237 | * is being released is holding the reservation.
|
| 1238 | *
|
| 1239 | * From spc4r17, section 5.7.11.1:
|
| 1240 | *
|
| 1241 | * e) If the I_T nexus is the persistent reservation holder
|
| 1242 | * and the persistent reservation is not an all registrants
|
| 1243 | * type, then a PERSISTENT RESERVE OUT command with REGISTER
|
| 1244 | * service action or REGISTER AND IGNORE EXISTING KEY
|
| 1245 | * service action with the SERVICE ACTION RESERVATION KEY
|
| 1246 | * field set to zero (see 5.7.11.3).
|
| 1247 |
|
| 1248 | __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
|
| 1249 | ret = 1;
|
| 1250 | |
| 1251 | * For 'All Registrants' reservation types, all existing
|
| 1252 | * registrations are still processed as reservation holders
|
| 1253 | * in core_scsi3_pr_seq_non_holder() after the initial
|
| 1254 | * reservation holder is implicitly released here.
|
| 1255 |
|
| 1256 | } else if (pr_reg->pr_reg_all_tg_pt &&
|
| 1257 | (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
|
| 1258 | pr_reg->pr_reg_nacl->initiatorname)) &&
|
| 1259 | (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
|
| 1260 | pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
|
| 1261 | " UNREGISTER while existing reservation with matching"
|
| 1262 | " key 0x%016Lx is present from another SCSI Initiator"
|
| 1263 | " Port\n", pr_reg->pr_res_key);
|
| 1264 | ret = -EPERM;
|
| 1265 | }
|
| 1266 | spin_unlock(&dev->dev_reservation_lock);
|
| 1267 |
|
| 1268 | return ret;
|
| 1269 | }
|
| 1270 |
|
| 1271 | static void __core_scsi3_free_registration(
|
| 1272 | struct se_device *dev,
|
| 1273 | struct t10_pr_registration *pr_reg,
|
| 1274 | struct list_head *preempt_and_abort_list,
|
| 1275 | int dec_holders)
|
| 1276 | __releases(&pr_tmpl->registration_lock)
|
| 1277 | __acquires(&pr_tmpl->registration_lock)
|
| 1278 | {
|
| 1279 | const struct target_core_fabric_ops *tfo =
|
| 1280 | pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
|
| 1281 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 1282 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
| 1283 | struct se_dev_entry *deve;
|
| 1284 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 1285 |
|
| 1286 | lockdep_assert_held(&pr_tmpl->registration_lock);
|
| 1287 |
|
| 1288 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 1289 |
|
| 1290 | if (!list_empty(&pr_reg->pr_reg_list))
|
| 1291 | list_del(&pr_reg->pr_reg_list);
|
| 1292 | |
| 1293 | * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
|
| 1294 | * so call core_scsi3_put_pr_reg() to decrement our reference.
|
| 1295 |
|
| 1296 | if (dec_holders)
|
| 1297 | core_scsi3_put_pr_reg(pr_reg);
|
| 1298 |
|
| 1299 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1300 | |
| 1301 | * Wait until all reference from any other I_T nexuses for this
|
| 1302 | * *pr_reg have been released. Because list_del() is called above,
|
| 1303 | * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
|
| 1304 | * count back to zero, and we release *pr_reg.
|
| 1305 |
|
| 1306 | while (atomic_read(&pr_reg->pr_res_holders) != 0) {
|
| 1307 | pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
|
| 1308 | tfo->fabric_name);
|
| 1309 | cpu_relax();
|
| 1310 | }
|
| 1311 |
|
| 1312 | rcu_read_lock();
|
| 1313 | deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
|
| 1314 | if (deve)
|
| 1315 | clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
| 1316 | rcu_read_unlock();
|
| 1317 |
|
| 1318 | spin_lock(&pr_tmpl->registration_lock);
|
| 1319 | pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
|
| 1320 | " Node: %s%s\n", tfo->fabric_name,
|
| 1321 | pr_reg->pr_reg_nacl->initiatorname,
|
| 1322 | i_buf);
|
| 1323 | pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
|
| 1324 | " Port(s)\n", tfo->fabric_name,
|
| 1325 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
|
| 1326 | dev->transport->name);
|
| 1327 | pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
|
| 1328 | " 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key,
|
| 1329 | pr_reg->pr_res_generation);
|
| 1330 |
|
| 1331 | if (!preempt_and_abort_list) {
|
| 1332 | pr_reg->pr_reg_deve = NULL;
|
| 1333 | pr_reg->pr_reg_nacl = NULL;
|
| 1334 | kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
| 1335 | return;
|
| 1336 | }
|
| 1337 | |
| 1338 | * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
|
| 1339 | * are released once the ABORT_TASK_SET has completed..
|
| 1340 |
|
| 1341 | list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
|
| 1342 | }
|
| 1343 |
|
| 1344 | void core_scsi3_free_pr_reg_from_nacl(
|
| 1345 | struct se_device *dev,
|
| 1346 | struct se_node_acl *nacl)
|
| 1347 | {
|
| 1348 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 1349 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
|
| 1350 | bool free_reg = false;
|
| 1351 | |
| 1352 | * If the passed se_node_acl matches the reservation holder,
|
| 1353 | * release the reservation.
|
| 1354 |
|
| 1355 | spin_lock(&dev->dev_reservation_lock);
|
| 1356 | pr_res_holder = dev->dev_pr_res_holder;
|
| 1357 | if ((pr_res_holder != NULL) &&
|
| 1358 | (pr_res_holder->pr_reg_nacl == nacl)) {
|
| 1359 | __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
|
| 1360 | free_reg = true;
|
| 1361 | }
|
| 1362 | spin_unlock(&dev->dev_reservation_lock);
|
| 1363 | |
| 1364 | * Release any registration associated with the struct se_node_acl.
|
| 1365 |
|
| 1366 | spin_lock(&pr_tmpl->registration_lock);
|
| 1367 | if (pr_res_holder && free_reg)
|
| 1368 | __core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
|
| 1369 |
|
| 1370 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 1371 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 1372 |
|
| 1373 | if (pr_reg->pr_reg_nacl != nacl)
|
| 1374 | continue;
|
| 1375 |
|
| 1376 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
|
| 1377 | }
|
| 1378 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1379 | }
|
| 1380 |
|
| 1381 | void core_scsi3_free_all_registrations(
|
| 1382 | struct se_device *dev)
|
| 1383 | {
|
| 1384 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 1385 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
|
| 1386 |
|
| 1387 | spin_lock(&dev->dev_reservation_lock);
|
| 1388 | pr_res_holder = dev->dev_pr_res_holder;
|
| 1389 | if (pr_res_holder != NULL) {
|
| 1390 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 1391 | __core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
| 1392 | pr_res_holder, 0, 0);
|
| 1393 | }
|
| 1394 | spin_unlock(&dev->dev_reservation_lock);
|
| 1395 |
|
| 1396 | spin_lock(&pr_tmpl->registration_lock);
|
| 1397 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 1398 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 1399 |
|
| 1400 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
|
| 1401 | }
|
| 1402 | spin_unlock(&pr_tmpl->registration_lock);
|
| 1403 |
|
| 1404 | spin_lock(&pr_tmpl->aptpl_reg_lock);
|
| 1405 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
|
| 1406 | pr_reg_aptpl_list) {
|
| 1407 | list_del(&pr_reg->pr_reg_aptpl_list);
|
| 1408 | kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
| 1409 | }
|
| 1410 | spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
| 1411 | }
|
| 1412 |
|
| 1413 | static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
|
| 1414 | {
|
| 1415 | return target_depend_item(&tpg->tpg_group.cg_item);
|
| 1416 | }
|
| 1417 |
|
| 1418 | static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
|
| 1419 | {
|
| 1420 | target_undepend_item(&tpg->tpg_group.cg_item);
|
| 1421 | atomic_dec_mb(&tpg->tpg_pr_ref_count);
|
| 1422 | }
|
| 1423 |
|
| 1424 | static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
|
| 1425 | {
|
| 1426 | if (nacl->dynamic_node_acl)
|
| 1427 | return 0;
|
| 1428 | return target_depend_item(&nacl->acl_group.cg_item);
|
| 1429 | }
|
| 1430 |
|
| 1431 | static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
|
| 1432 | {
|
| 1433 | if (!nacl->dynamic_node_acl)
|
| 1434 | target_undepend_item(&nacl->acl_group.cg_item);
|
| 1435 | atomic_dec_mb(&nacl->acl_pr_ref_count);
|
| 1436 | }
|
| 1437 |
|
| 1438 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
|
| 1439 | {
|
| 1440 | |
| 1441 | * For nacl->dynamic_node_acl=1
|
| 1442 |
|
| 1443 | if (!se_deve->se_lun_acl)
|
| 1444 | return 0;
|
| 1445 |
|
| 1446 | return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
|
| 1447 | }
|
| 1448 |
|
| 1449 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
|
| 1450 | {
|
| 1451 | |
| 1452 | * For nacl->dynamic_node_acl=1
|
| 1453 |
|
| 1454 | if (!se_deve->se_lun_acl) {
|
| 1455 | kref_put(&se_deve->pr_kref, target_pr_kref_release);
|
| 1456 | return;
|
| 1457 | }
|
| 1458 |
|
| 1459 | target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
|
| 1460 | kref_put(&se_deve->pr_kref, target_pr_kref_release);
|
| 1461 | }
|
| 1462 |
|
| 1463 | static sense_reason_t
|
| 1464 | core_scsi3_decode_spec_i_port(
|
| 1465 | struct se_cmd *cmd,
|
| 1466 | struct se_portal_group *tpg,
|
| 1467 | unsigned char *l_isid,
|
| 1468 | u64 sa_res_key,
|
| 1469 | int all_tg_pt,
|
| 1470 | int aptpl)
|
| 1471 | {
|
| 1472 | struct se_device *dev = cmd->se_dev;
|
| 1473 | struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
|
| 1474 | struct se_session *se_sess = cmd->se_sess;
|
| 1475 | struct se_node_acl *dest_node_acl = NULL;
|
| 1476 | struct se_dev_entry *dest_se_deve = NULL;
|
| 1477 | struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
|
| 1478 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
|
| 1479 | LIST_HEAD(tid_dest_list);
|
| 1480 | struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
|
| 1481 | unsigned char *buf, *ptr, proto_ident;
|
| 1482 | unsigned char i_str[TRANSPORT_IQN_LEN];
|
| 1483 | char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
|
| 1484 | sense_reason_t ret;
|
| 1485 | u32 tpdl, tid_len = 0;
|
| 1486 | u32 dest_rtpi = 0;
|
| 1487 | bool tid_found;
|
| 1488 |
|
| 1489 | |
| 1490 | * Allocate a struct pr_transport_id_holder and setup the
|
| 1491 | * local_node_acl pointer and add to struct list_head tid_dest_list
|
| 1492 | * for add registration processing in the loop of tid_dest_list below.
|
| 1493 |
|
| 1494 | tidh_new = kzalloc_obj(struct pr_transport_id_holder);
|
| 1495 | if (!tidh_new) {
|
| 1496 | pr_err("Unable to allocate tidh_new\n");
|
| 1497 | return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 1498 | }
|
| 1499 | INIT_LIST_HEAD(&tidh_new->dest_list);
|
| 1500 | tidh_new->dest_tpg = tpg;
|
| 1501 | tidh_new->dest_node_acl = se_sess->se_node_acl;
|
| 1502 |
|
| 1503 | local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
|
| 1504 | se_sess->se_node_acl, cmd->se_lun,
|
| 1505 | NULL, cmd->orig_fe_lun, l_isid,
|
| 1506 | sa_res_key, all_tg_pt, aptpl);
|
| 1507 | if (!local_pr_reg) {
|
| 1508 | kfree(tidh_new);
|
| 1509 | return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 1510 | }
|
| 1511 |
|
| 1512 | if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
|
| 1513 | kfree(tidh_new);
|
| 1514 | kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
|
| 1515 | target_pr_kref_release);
|
| 1516 | kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
|
| 1517 | return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 1518 | }
|
| 1519 |
|
| 1520 | tidh_new->dest_pr_reg = local_pr_reg;
|
| 1521 | list_add_tail(&tidh_new->dest_list, &tid_dest_list);
|
| 1522 |
|
| 1523 | if (cmd->data_length < 28) {
|
| 1524 | pr_warn("SPC-PR: Received PR OUT parameter list"
|
| 1525 | " length too small: %u\n", cmd->data_length);
|
| 1526 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1527 | goto out;
|
| 1528 | }
|
| 1529 |
|
| 1530 | buf = transport_kmap_data_sg(cmd);
|
| 1531 | if (!buf) {
|
| 1532 | ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 1533 | goto out;
|
| 1534 | }
|
| 1535 |
|
| 1536 | |
| 1537 | * For a PERSISTENT RESERVE OUT specify initiator ports payload,
|
| 1538 | * first extract TransportID Parameter Data Length, and make sure
|
| 1539 | * the value matches up to the SCSI expected data transfer length.
|
| 1540 |
|
| 1541 | tpdl = get_unaligned_be32(&buf[24]);
|
| 1542 |
|
| 1543 | if ((tpdl + 28) != cmd->data_length) {
|
| 1544 | pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
|
| 1545 | " does not equal CDB data_length: %u\n", tpdl,
|
| 1546 | cmd->data_length);
|
| 1547 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1548 | goto out_unmap;
|
| 1549 | }
|
| 1550 | |
| 1551 | * Start processing the received transport IDs using the
|
| 1552 | * receiving I_T Nexus portal's fabric dependent methods to
|
| 1553 | * obtain the SCSI Initiator Port/Device Identifiers.
|
| 1554 |
|
| 1555 | ptr = &buf[28];
|
| 1556 |
|
| 1557 | while (tpdl > 0) {
|
| 1558 | struct se_lun *dest_lun, *tmp_lun;
|
| 1559 |
|
| 1560 | proto_ident = (ptr[0] & 0x0f);
|
| 1561 | dest_tpg = NULL;
|
| 1562 |
|
| 1563 | spin_lock(&dev->se_port_lock);
|
| 1564 | list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
|
| 1565 | tmp_tpg = tmp_lun->lun_tpg;
|
| 1566 |
|
| 1567 | |
| 1568 | * Look for the matching proto_ident provided by
|
| 1569 | * the received TransportID
|
| 1570 |
|
| 1571 | if (tmp_tpg->proto_id != proto_ident)
|
| 1572 | continue;
|
| 1573 | dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi;
|
| 1574 |
|
| 1575 | iport_ptr = NULL;
|
| 1576 | tid_found = target_parse_pr_out_transport_id(tmp_tpg,
|
| 1577 | ptr, tpdl, &tid_len, &iport_ptr, i_str);
|
| 1578 | if (!tid_found)
|
| 1579 | continue;
|
| 1580 | |
| 1581 | * Determine if this SCSI device server requires that
|
| 1582 | * SCSI Intiatior TransportID w/ ISIDs is enforced
|
| 1583 | * for fabric modules (iSCSI) requiring them.
|
| 1584 |
|
| 1585 | if (tpg->se_tpg_tfo->sess_get_initiator_sid &&
|
| 1586 | dev->dev_attrib.enforce_pr_isids &&
|
| 1587 | !iport_ptr) {
|
| 1588 | pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",
|
| 1589 | i_str);
|
| 1590 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1591 | spin_unlock(&dev->se_port_lock);
|
| 1592 | goto out_unmap;
|
| 1593 | }
|
| 1594 |
|
| 1595 | atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
|
| 1596 | spin_unlock(&dev->se_port_lock);
|
| 1597 |
|
| 1598 | if (core_scsi3_tpg_depend_item(tmp_tpg)) {
|
| 1599 | pr_err(" core_scsi3_tpg_depend_item()"
|
| 1600 | " for tmp_tpg\n");
|
| 1601 | atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
|
| 1602 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 1603 | goto out_unmap;
|
| 1604 | }
|
| 1605 | |
| 1606 | * Locate the destination initiator ACL to be registered
|
| 1607 | * from the decoded fabric module specific TransportID
|
| 1608 | * at *i_str.
|
| 1609 |
|
| 1610 | mutex_lock(&tmp_tpg->acl_node_mutex);
|
| 1611 | dest_node_acl = __core_tpg_get_initiator_node_acl(
|
| 1612 | tmp_tpg, i_str);
|
| 1613 | if (dest_node_acl)
|
| 1614 | atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
|
| 1615 | mutex_unlock(&tmp_tpg->acl_node_mutex);
|
| 1616 |
|
| 1617 | if (!dest_node_acl) {
|
| 1618 | core_scsi3_tpg_undepend_item(tmp_tpg);
|
| 1619 | spin_lock(&dev->se_port_lock);
|
| 1620 | continue;
|
| 1621 | }
|
| 1622 |
|
| 1623 | if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
|
| 1624 | pr_err("configfs_depend_item() failed"
|
| 1625 | " for dest_node_acl->acl_group\n");
|
| 1626 | atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
|
| 1627 | core_scsi3_tpg_undepend_item(tmp_tpg);
|
| 1628 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 1629 | goto out_unmap;
|
| 1630 | }
|
| 1631 |
|
| 1632 | dest_tpg = tmp_tpg;
|
| 1633 | pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",
|
| 1634 | dest_tpg->se_tpg_tfo->fabric_name,
|
| 1635 | dest_node_acl->initiatorname, dest_rtpi);
|
| 1636 |
|
| 1637 | spin_lock(&dev->se_port_lock);
|
| 1638 | break;
|
| 1639 | }
|
| 1640 | spin_unlock(&dev->se_port_lock);
|
| 1641 |
|
| 1642 | if (!dest_tpg) {
|
| 1643 | pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
|
| 1644 | " dest_tpg\n");
|
| 1645 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1646 | goto out_unmap;
|
| 1647 | }
|
| 1648 |
|
| 1649 | pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
|
| 1650 | " tid_len: %d for %s + %s\n",
|
| 1651 | dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length,
|
| 1652 | tpdl, tid_len, i_str, iport_ptr);
|
| 1653 |
|
| 1654 | if (tid_len > tpdl) {
|
| 1655 | pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
|
| 1656 | " %u for Transport ID: %s\n", tid_len, ptr);
|
| 1657 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1658 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1659 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1660 | goto out_unmap;
|
| 1661 | }
|
| 1662 | |
| 1663 | * Locate the desintation struct se_dev_entry pointer for matching
|
| 1664 | * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
|
| 1665 | * Target Port.
|
| 1666 |
|
| 1667 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
|
| 1668 | dest_rtpi);
|
| 1669 | if (!dest_se_deve) {
|
| 1670 | pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n",
|
| 1671 | dest_tpg->se_tpg_tfo->fabric_name,
|
| 1672 | dest_rtpi);
|
| 1673 |
|
| 1674 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1675 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1676 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 1677 | goto out_unmap;
|
| 1678 | }
|
| 1679 |
|
| 1680 | if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
|
| 1681 | pr_err("core_scsi3_lunacl_depend_item()"
|
| 1682 | " failed\n");
|
| 1683 | kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
|
| 1684 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1685 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1686 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 1687 | goto out_unmap;
|
| 1688 | }
|
| 1689 |
|
| 1690 | pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
|
| 1691 | " dest_se_deve mapped_lun: %llu\n",
|
| 1692 | dest_tpg->se_tpg_tfo->fabric_name,
|
| 1693 | dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
|
| 1694 |
|
| 1695 | |
| 1696 | * Skip any TransportIDs that already have a registration for
|
| 1697 | * this target port.
|
| 1698 |
|
| 1699 | pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
| 1700 | iport_ptr);
|
| 1701 | if (pr_reg_e) {
|
| 1702 | core_scsi3_put_pr_reg(pr_reg_e);
|
| 1703 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 1704 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1705 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1706 | ptr += tid_len;
|
| 1707 | tpdl -= tid_len;
|
| 1708 | tid_len = 0;
|
| 1709 | continue;
|
| 1710 | }
|
| 1711 | |
| 1712 | * Allocate a struct pr_transport_id_holder and setup
|
| 1713 | * the dest_node_acl and dest_se_deve pointers for the
|
| 1714 | * loop below.
|
| 1715 |
|
| 1716 | tidh_new = kzalloc_obj(struct pr_transport_id_holder);
|
| 1717 | if (!tidh_new) {
|
| 1718 | pr_err("Unable to allocate tidh_new\n");
|
| 1719 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 1720 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1721 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1722 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 1723 | goto out_unmap;
|
| 1724 | }
|
| 1725 | INIT_LIST_HEAD(&tidh_new->dest_list);
|
| 1726 | tidh_new->dest_tpg = dest_tpg;
|
| 1727 | tidh_new->dest_node_acl = dest_node_acl;
|
| 1728 | tidh_new->dest_se_deve = dest_se_deve;
|
| 1729 |
|
| 1730 | |
| 1731 | * Allocate, but do NOT add the registration for the
|
| 1732 | * TransportID referenced SCSI Initiator port. This
|
| 1733 | * done because of the following from spc4r17 in section
|
| 1734 | * 6.14.3 wrt SPEC_I_PT:
|
| 1735 | *
|
| 1736 | * "If a registration fails for any initiator port (e.g., if th
|
| 1737 | * logical unit does not have enough resources available to
|
| 1738 | * hold the registration information), no registrations shall be
|
| 1739 | * made, and the command shall be terminated with
|
| 1740 | * CHECK CONDITION status."
|
| 1741 | *
|
| 1742 | * That means we call __core_scsi3_alloc_registration() here,
|
| 1743 | * and then call __core_scsi3_add_registration() in the
|
| 1744 | * 2nd loop which will never fail.
|
| 1745 |
|
| 1746 | dest_lun = dest_se_deve->se_lun;
|
| 1747 |
|
| 1748 | dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
|
| 1749 | dest_node_acl, dest_lun, dest_se_deve,
|
| 1750 | dest_se_deve->mapped_lun, iport_ptr,
|
| 1751 | sa_res_key, all_tg_pt, aptpl);
|
| 1752 | if (!dest_pr_reg) {
|
| 1753 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 1754 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1755 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1756 | kfree(tidh_new);
|
| 1757 | ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 1758 | goto out_unmap;
|
| 1759 | }
|
| 1760 | tidh_new->dest_pr_reg = dest_pr_reg;
|
| 1761 | list_add_tail(&tidh_new->dest_list, &tid_dest_list);
|
| 1762 |
|
| 1763 | ptr += tid_len;
|
| 1764 | tpdl -= tid_len;
|
| 1765 | tid_len = 0;
|
| 1766 |
|
| 1767 | }
|
| 1768 |
|
| 1769 | transport_kunmap_data_sg(cmd);
|
| 1770 |
|
| 1771 | |
| 1772 | * Go ahead and create a registrations from tid_dest_list for the
|
| 1773 | * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
|
| 1774 | * and dest_se_deve.
|
| 1775 | *
|
| 1776 | * The SA Reservation Key from the PROUT is set for the
|
| 1777 | * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
|
| 1778 | * means that the TransportID Initiator port will be
|
| 1779 | * registered on all of the target ports in the SCSI target device
|
| 1780 | * ALL_TG_PT=0 means the registration will only be for the
|
| 1781 | * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
|
| 1782 | * was received.
|
| 1783 |
|
| 1784 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
|
| 1785 | dest_tpg = tidh->dest_tpg;
|
| 1786 | dest_node_acl = tidh->dest_node_acl;
|
| 1787 | dest_se_deve = tidh->dest_se_deve;
|
| 1788 | dest_pr_reg = tidh->dest_pr_reg;
|
| 1789 |
|
| 1790 | list_del(&tidh->dest_list);
|
| 1791 | kfree(tidh);
|
| 1792 |
|
| 1793 | memset(i_buf, 0, PR_REG_ISID_ID_LEN);
|
| 1794 | core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 1795 |
|
| 1796 | __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
|
| 1797 | dest_pr_reg, 0, 0);
|
| 1798 |
|
| 1799 | pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
|
| 1800 | " registered Transport ID for Node: %s%s Mapped LUN:"
|
| 1801 | " %llu\n", dest_tpg->se_tpg_tfo->fabric_name,
|
| 1802 | dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
|
| 1803 | dest_se_deve->mapped_lun : 0);
|
| 1804 |
|
| 1805 | if (dest_pr_reg == local_pr_reg)
|
| 1806 | continue;
|
| 1807 |
|
| 1808 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1809 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1810 | }
|
| 1811 |
|
| 1812 | return 0;
|
| 1813 | out_unmap:
|
| 1814 | transport_kunmap_data_sg(cmd);
|
| 1815 | out:
|
| 1816 | |
| 1817 | * For the failure case, release everything from tid_dest_list
|
| 1818 | * including *dest_pr_reg and the configfs dependances..
|
| 1819 |
|
| 1820 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
|
| 1821 | bool is_local = false;
|
| 1822 |
|
| 1823 | dest_tpg = tidh->dest_tpg;
|
| 1824 | dest_node_acl = tidh->dest_node_acl;
|
| 1825 | dest_se_deve = tidh->dest_se_deve;
|
| 1826 | dest_pr_reg = tidh->dest_pr_reg;
|
| 1827 |
|
| 1828 | if (dest_pr_reg == local_pr_reg)
|
| 1829 | is_local = true;
|
| 1830 |
|
| 1831 | list_del(&tidh->dest_list);
|
| 1832 | kfree(tidh);
|
| 1833 | |
| 1834 | * Release any extra ALL_TG_PT=1 registrations for
|
| 1835 | * the SPEC_I_PT=1 case.
|
| 1836 |
|
| 1837 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
| 1838 | &dest_pr_reg->pr_reg_atp_list,
|
| 1839 | pr_reg_atp_mem_list) {
|
| 1840 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
| 1841 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
|
| 1842 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
|
| 1843 | }
|
| 1844 |
|
| 1845 | kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
|
| 1846 |
|
| 1847 | if (dest_se_deve)
|
| 1848 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 1849 |
|
| 1850 | if (is_local)
|
| 1851 | continue;
|
| 1852 |
|
| 1853 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 1854 | core_scsi3_tpg_undepend_item(dest_tpg);
|
| 1855 | }
|
| 1856 | return ret;
|
| 1857 | }
|
| 1858 |
|
| 1859 | static int core_scsi3_update_aptpl_buf(
|
| 1860 | struct se_device *dev,
|
| 1861 | unsigned char *buf,
|
| 1862 | u32 pr_aptpl_buf_len)
|
| 1863 | {
|
| 1864 | struct se_portal_group *tpg;
|
| 1865 | struct t10_pr_registration *pr_reg;
|
| 1866 | unsigned char tmp[512], isid_buf[32];
|
| 1867 | ssize_t len = 0;
|
| 1868 | int reg_count = 0;
|
| 1869 | int ret = 0;
|
| 1870 |
|
| 1871 | spin_lock(&dev->dev_reservation_lock);
|
| 1872 | spin_lock(&dev->t10_pr.registration_lock);
|
| 1873 | |
| 1874 | * Walk the registration list..
|
| 1875 |
|
| 1876 | list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
|
| 1877 | pr_reg_list) {
|
| 1878 |
|
| 1879 | tmp[0] = '\0';
|
| 1880 | isid_buf[0] = '\0';
|
| 1881 | tpg = pr_reg->pr_reg_nacl->se_tpg;
|
| 1882 | |
| 1883 | * Write out any ISID value to APTPL metadata that was included
|
| 1884 | * in the original registration.
|
| 1885 |
|
| 1886 | if (pr_reg->isid_present_at_reg)
|
| 1887 | snprintf(isid_buf, 32, "initiator_sid=%s\n",
|
| 1888 | pr_reg->pr_reg_isid);
|
| 1889 | |
| 1890 | * Include special metadata if the pr_reg matches the
|
| 1891 | * reservation holder.
|
| 1892 |
|
| 1893 | if (dev->dev_pr_res_holder == pr_reg) {
|
| 1894 | snprintf(tmp, 512, "PR_REG_START: %d"
|
| 1895 | "\ninitiator_fabric=%s\n"
|
| 1896 | "initiator_node=%s\n%s"
|
| 1897 | "sa_res_key=%llu\n"
|
| 1898 | "res_holder=1\nres_type=%02x\n"
|
| 1899 | "res_scope=%02x\nres_all_tg_pt=%d\n"
|
| 1900 | "mapped_lun=%llu\n", reg_count,
|
| 1901 | tpg->se_tpg_tfo->fabric_name,
|
| 1902 | pr_reg->pr_reg_nacl->initiatorname, isid_buf,
|
| 1903 | pr_reg->pr_res_key, pr_reg->pr_res_type,
|
| 1904 | pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
|
| 1905 | pr_reg->pr_res_mapped_lun);
|
| 1906 | } else {
|
| 1907 | snprintf(tmp, 512, "PR_REG_START: %d\n"
|
| 1908 | "initiator_fabric=%s\ninitiator_node=%s\n%s"
|
| 1909 | "sa_res_key=%llu\nres_holder=0\n"
|
| 1910 | "res_all_tg_pt=%d\nmapped_lun=%llu\n",
|
| 1911 | reg_count, tpg->se_tpg_tfo->fabric_name,
|
| 1912 | pr_reg->pr_reg_nacl->initiatorname, isid_buf,
|
| 1913 | pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
|
| 1914 | pr_reg->pr_res_mapped_lun);
|
| 1915 | }
|
| 1916 |
|
| 1917 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
|
| 1918 | pr_err("Unable to update renaming APTPL metadata,"
|
| 1919 | " reallocating larger buffer\n");
|
| 1920 | ret = -EMSGSIZE;
|
| 1921 | goto out;
|
| 1922 | }
|
| 1923 | len += sprintf(buf+len, "%s", tmp);
|
| 1924 |
|
| 1925 | |
| 1926 | * Include information about the associated SCSI target port.
|
| 1927 |
|
| 1928 | snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
|
| 1929 | "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
|
| 1930 | " %d\n", tpg->se_tpg_tfo->fabric_name,
|
| 1931 | tpg->se_tpg_tfo->tpg_get_wwn(tpg),
|
| 1932 | tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
| 1933 | pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
|
| 1934 | reg_count);
|
| 1935 |
|
| 1936 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
|
| 1937 | pr_err("Unable to update renaming APTPL metadata,"
|
| 1938 | " reallocating larger buffer\n");
|
| 1939 | ret = -EMSGSIZE;
|
| 1940 | goto out;
|
| 1941 | }
|
| 1942 | len += sprintf(buf+len, "%s", tmp);
|
| 1943 | reg_count++;
|
| 1944 | }
|
| 1945 |
|
| 1946 | if (!reg_count)
|
| 1947 | len += sprintf(buf+len, "No Registrations or Reservations");
|
| 1948 |
|
| 1949 | out:
|
| 1950 | spin_unlock(&dev->t10_pr.registration_lock);
|
| 1951 | spin_unlock(&dev->dev_reservation_lock);
|
| 1952 |
|
| 1953 | return ret;
|
| 1954 | }
|
| 1955 |
|
| 1956 | static int __core_scsi3_write_aptpl_to_file(
|
| 1957 | struct se_device *dev,
|
| 1958 | unsigned char *buf)
|
| 1959 | {
|
| 1960 | struct t10_wwn *wwn = &dev->t10_wwn;
|
| 1961 | struct file *file;
|
| 1962 | int flags = O_RDWR | O_CREAT | O_TRUNC;
|
| 1963 | char *path;
|
| 1964 | u32 pr_aptpl_buf_len;
|
| 1965 | int ret;
|
| 1966 | loff_t pos = 0;
|
| 1967 |
|
| 1968 | path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
|
| 1969 | &wwn->unit_serial[0]);
|
| 1970 | if (!path)
|
| 1971 | return -ENOMEM;
|
| 1972 |
|
| 1973 | scoped_with_init_fs()
|
| 1974 | file = filp_open(path, flags, 0600);
|
| 1975 | if (IS_ERR(file)) {
|
| 1976 | pr_err("filp_open(%s) for APTPL metadata"
|
| 1977 | " failed\n", path);
|
| 1978 | kfree(path);
|
| 1979 | return PTR_ERR(file);
|
| 1980 | }
|
| 1981 |
|
| 1982 | pr_aptpl_buf_len = (strlen(buf) + 1);
|
| 1983 |
|
| 1984 | ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
|
| 1985 |
|
| 1986 | if (ret < 0)
|
| 1987 | pr_debug("Error writing APTPL metadata file: %s\n", path);
|
| 1988 | fput(file);
|
| 1989 | kfree(path);
|
| 1990 |
|
| 1991 | return (ret < 0) ? -EIO : 0;
|
| 1992 | }
|
| 1993 |
|
| 1994 | |
| 1995 | * Clear the APTPL metadata if APTPL has been disabled, otherwise
|
| 1996 | * write out the updated metadata to struct file for this SCSI device.
|
| 1997 |
|
| 1998 | static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
|
| 1999 | {
|
| 2000 | unsigned char *buf;
|
| 2001 | int rc, len = PR_APTPL_BUF_LEN;
|
| 2002 |
|
| 2003 | if (!aptpl) {
|
| 2004 | char *null_buf = "No Registrations or Reservations\n";
|
| 2005 |
|
| 2006 | rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
|
| 2007 | dev->t10_pr.pr_aptpl_active = 0;
|
| 2008 | pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
|
| 2009 |
|
| 2010 | if (rc)
|
| 2011 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2012 |
|
| 2013 | return 0;
|
| 2014 | }
|
| 2015 | retry:
|
| 2016 | buf = vzalloc(len);
|
| 2017 | if (!buf)
|
| 2018 | return TCM_OUT_OF_RESOURCES;
|
| 2019 |
|
| 2020 | rc = core_scsi3_update_aptpl_buf(dev, buf, len);
|
| 2021 | if (rc < 0) {
|
| 2022 | vfree(buf);
|
| 2023 | len *= 2;
|
| 2024 | goto retry;
|
| 2025 | }
|
| 2026 |
|
| 2027 | rc = __core_scsi3_write_aptpl_to_file(dev, buf);
|
| 2028 | if (rc != 0) {
|
| 2029 | pr_err("SPC-3 PR: Could not update APTPL\n");
|
| 2030 | vfree(buf);
|
| 2031 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2032 | }
|
| 2033 | dev->t10_pr.pr_aptpl_active = 1;
|
| 2034 | vfree(buf);
|
| 2035 | pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
|
| 2036 | return 0;
|
| 2037 | }
|
| 2038 |
|
| 2039 | static sense_reason_t
|
| 2040 | core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
|
| 2041 | bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
|
| 2042 | {
|
| 2043 | struct se_session *se_sess = cmd->se_sess;
|
| 2044 | struct se_device *dev = cmd->se_dev;
|
| 2045 | struct se_lun *se_lun = cmd->se_lun;
|
| 2046 | struct se_portal_group *se_tpg;
|
| 2047 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
|
| 2048 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 2049 | unsigned char isid_buf[PR_REG_ISID_LEN] = { };
|
| 2050 | unsigned char *isid_ptr = NULL;
|
| 2051 | sense_reason_t ret = TCM_NO_SENSE;
|
| 2052 | int pr_holder = 0, type;
|
| 2053 |
|
| 2054 | if (!se_sess || !se_lun) {
|
| 2055 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
| 2056 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2057 | }
|
| 2058 | se_tpg = se_sess->se_tpg;
|
| 2059 |
|
| 2060 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
|
| 2061 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
|
| 2062 | PR_REG_ISID_LEN);
|
| 2063 | isid_ptr = &isid_buf[0];
|
| 2064 | }
|
| 2065 | |
| 2066 | * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
|
| 2067 |
|
| 2068 | pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
|
| 2069 | if (!pr_reg) {
|
| 2070 | if (res_key) {
|
| 2071 | pr_warn("SPC-3 PR: Reservation Key non-zero"
|
| 2072 | " for SA REGISTER, returning CONFLICT\n");
|
| 2073 | return TCM_RESERVATION_CONFLICT;
|
| 2074 | }
|
| 2075 | |
| 2076 | * Do nothing but return GOOD status.
|
| 2077 |
|
| 2078 | if (!sa_res_key)
|
| 2079 | return 0;
|
| 2080 |
|
| 2081 | if (!spec_i_pt) {
|
| 2082 | |
| 2083 | * Perform the Service Action REGISTER on the Initiator
|
| 2084 | * Port Endpoint that the PRO was received from on the
|
| 2085 | * Logical Unit of the SCSI device server.
|
| 2086 |
|
| 2087 | if (core_scsi3_alloc_registration(cmd->se_dev,
|
| 2088 | se_sess->se_node_acl, cmd->se_lun,
|
| 2089 | NULL, cmd->orig_fe_lun, isid_ptr,
|
| 2090 | sa_res_key, all_tg_pt, aptpl,
|
| 2091 | register_type, 0)) {
|
| 2092 | pr_err("Unable to allocate"
|
| 2093 | " struct t10_pr_registration\n");
|
| 2094 | return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 2095 | }
|
| 2096 | } else {
|
| 2097 | |
| 2098 | * Register both the Initiator port that received
|
| 2099 | * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
|
| 2100 | * TransportID from Parameter list and loop through
|
| 2101 | * fabric dependent parameter list while calling
|
| 2102 | * logic from of core_scsi3_alloc_registration() for
|
| 2103 | * each TransportID provided SCSI Initiator Port/Device
|
| 2104 |
|
| 2105 | ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
|
| 2106 | isid_ptr, sa_res_key, all_tg_pt, aptpl);
|
| 2107 | if (ret != 0)
|
| 2108 | return ret;
|
| 2109 | }
|
| 2110 | return core_scsi3_update_and_write_aptpl(dev, aptpl);
|
| 2111 | }
|
| 2112 |
|
| 2113 |
|
| 2114 |
|
| 2115 | if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
|
| 2116 | pr_err("SPC-3 PR REGISTER: Received"
|
| 2117 | " res_key: 0x%016Lx does not match"
|
| 2118 | " existing SA REGISTER res_key:"
|
| 2119 | " 0x%016Lx\n", res_key,
|
| 2120 | pr_reg->pr_res_key);
|
| 2121 | ret = TCM_RESERVATION_CONFLICT;
|
| 2122 | goto out;
|
| 2123 | }
|
| 2124 |
|
| 2125 | if (spec_i_pt) {
|
| 2126 | pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
|
| 2127 | " set on a registered nexus\n");
|
| 2128 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 2129 | goto out;
|
| 2130 | }
|
| 2131 |
|
| 2132 | |
| 2133 | * An existing ALL_TG_PT=1 registration being released
|
| 2134 | * must also set ALL_TG_PT=1 in the incoming PROUT.
|
| 2135 |
|
| 2136 | if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
|
| 2137 | pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
|
| 2138 | " registration exists, but ALL_TG_PT=1 bit not"
|
| 2139 | " present in received PROUT\n");
|
| 2140 | ret = TCM_INVALID_CDB_FIELD;
|
| 2141 | goto out;
|
| 2142 | }
|
| 2143 |
|
| 2144 | |
| 2145 | * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
|
| 2146 |
|
| 2147 | if (sa_res_key) {
|
| 2148 | |
| 2149 | * Increment PRgeneration counter for struct se_device"
|
| 2150 | * upon a successful REGISTER, see spc4r17 section 6.3.2
|
| 2151 | * READ_KEYS service action.
|
| 2152 |
|
| 2153 | pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
|
| 2154 | pr_reg->pr_res_key = sa_res_key;
|
| 2155 | pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
|
| 2156 | " Key for %s to: 0x%016Lx PRgeneration:"
|
| 2157 | " 0x%08x\n", cmd->se_tfo->fabric_name,
|
| 2158 | (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
|
| 2159 | pr_reg->pr_reg_nacl->initiatorname,
|
| 2160 | pr_reg->pr_res_key, pr_reg->pr_res_generation);
|
| 2161 |
|
| 2162 | } else {
|
| 2163 | |
| 2164 | * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
|
| 2165 |
|
| 2166 | type = pr_reg->pr_res_type;
|
| 2167 | pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
|
| 2168 | pr_reg);
|
| 2169 | if (pr_holder < 0) {
|
| 2170 | ret = TCM_RESERVATION_CONFLICT;
|
| 2171 | goto out;
|
| 2172 | }
|
| 2173 |
|
| 2174 | spin_lock(&pr_tmpl->registration_lock);
|
| 2175 | |
| 2176 | * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
|
| 2177 | * and matching pr_res_key.
|
| 2178 |
|
| 2179 | if (pr_reg->pr_reg_all_tg_pt) {
|
| 2180 | list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
|
| 2181 | &pr_tmpl->registration_list,
|
| 2182 | pr_reg_list) {
|
| 2183 |
|
| 2184 | if (!pr_reg_p->pr_reg_all_tg_pt)
|
| 2185 | continue;
|
| 2186 | if (pr_reg_p->pr_res_key != res_key)
|
| 2187 | continue;
|
| 2188 | if (pr_reg == pr_reg_p)
|
| 2189 | continue;
|
| 2190 | if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
|
| 2191 | pr_reg_p->pr_reg_nacl->initiatorname))
|
| 2192 | continue;
|
| 2193 |
|
| 2194 | __core_scsi3_free_registration(dev,
|
| 2195 | pr_reg_p, NULL, 0);
|
| 2196 | }
|
| 2197 | }
|
| 2198 |
|
| 2199 | |
| 2200 | * Release the calling I_T Nexus registration now..
|
| 2201 |
|
| 2202 | __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
|
| 2203 | pr_reg = NULL;
|
| 2204 |
|
| 2205 | |
| 2206 | * From spc4r17, section 5.7.11.3 Unregistering
|
| 2207 | *
|
| 2208 | * If the persistent reservation is a registrants only
|
| 2209 | * type, the device server shall establish a unit
|
| 2210 | * attention condition for the initiator port associated
|
| 2211 | * with every registered I_T nexus except for the I_T
|
| 2212 | * nexus on which the PERSISTENT RESERVE OUT command was
|
| 2213 | * received, with the additional sense code set to
|
| 2214 | * RESERVATIONS RELEASED.
|
| 2215 |
|
| 2216 | if (pr_holder &&
|
| 2217 | (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
|
| 2218 | type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
|
| 2219 | list_for_each_entry(pr_reg_p,
|
| 2220 | &pr_tmpl->registration_list,
|
| 2221 | pr_reg_list) {
|
| 2222 |
|
| 2223 | target_ua_allocate_lun(
|
| 2224 | pr_reg_p->pr_reg_nacl,
|
| 2225 | pr_reg_p->pr_res_mapped_lun,
|
| 2226 | 0x2A,
|
| 2227 | ASCQ_2AH_RESERVATIONS_RELEASED);
|
| 2228 | }
|
| 2229 | }
|
| 2230 |
|
| 2231 | spin_unlock(&pr_tmpl->registration_lock);
|
| 2232 | }
|
| 2233 |
|
| 2234 | ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
|
| 2235 |
|
| 2236 | out:
|
| 2237 | if (pr_reg)
|
| 2238 | core_scsi3_put_pr_reg(pr_reg);
|
| 2239 | return ret;
|
| 2240 | }
|
| 2241 |
|
| 2242 | unsigned char *core_scsi3_pr_dump_type(int type)
|
| 2243 | {
|
| 2244 | switch (type) {
|
| 2245 | case PR_TYPE_WRITE_EXCLUSIVE:
|
| 2246 | return "Write Exclusive Access";
|
| 2247 | case PR_TYPE_EXCLUSIVE_ACCESS:
|
| 2248 | return "Exclusive Access";
|
| 2249 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
| 2250 | return "Write Exclusive Access, Registrants Only";
|
| 2251 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
| 2252 | return "Exclusive Access, Registrants Only";
|
| 2253 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
| 2254 | return "Write Exclusive Access, All Registrants";
|
| 2255 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
| 2256 | return "Exclusive Access, All Registrants";
|
| 2257 | default:
|
| 2258 | break;
|
| 2259 | }
|
| 2260 |
|
| 2261 | return "Unknown SPC-3 PR Type";
|
| 2262 | }
|
| 2263 |
|
| 2264 | static sense_reason_t
|
| 2265 | core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
|
| 2266 | {
|
| 2267 | struct se_device *dev = cmd->se_dev;
|
| 2268 | struct se_session *se_sess = cmd->se_sess;
|
| 2269 | struct se_lun *se_lun = cmd->se_lun;
|
| 2270 | struct t10_pr_registration *pr_reg, *pr_res_holder;
|
| 2271 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 2272 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 2273 | sense_reason_t ret;
|
| 2274 |
|
| 2275 | if (!se_sess || !se_lun) {
|
| 2276 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
| 2277 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2278 | }
|
| 2279 | |
| 2280 | * Locate the existing *pr_reg via struct se_node_acl pointers
|
| 2281 |
|
| 2282 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
| 2283 | se_sess);
|
| 2284 | if (!pr_reg) {
|
| 2285 | pr_err("SPC-3 PR: Unable to locate"
|
| 2286 | " PR_REGISTERED *pr_reg for RESERVE\n");
|
| 2287 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2288 | }
|
| 2289 | |
| 2290 | * From spc4r17 Section 5.7.9: Reserving:
|
| 2291 | *
|
| 2292 | * An application client creates a persistent reservation by issuing
|
| 2293 | * a PERSISTENT RESERVE OUT command with RESERVE service action through
|
| 2294 | * a registered I_T nexus with the following parameters:
|
| 2295 | * a) RESERVATION KEY set to the value of the reservation key that is
|
| 2296 | * registered with the logical unit for the I_T nexus; and
|
| 2297 |
|
| 2298 | if (res_key != pr_reg->pr_res_key) {
|
| 2299 | pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
|
| 2300 | " does not match existing SA REGISTER res_key:"
|
| 2301 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
| 2302 | ret = TCM_RESERVATION_CONFLICT;
|
| 2303 | goto out_put_pr_reg;
|
| 2304 | }
|
| 2305 | |
| 2306 | * From spc4r17 Section 5.7.9: Reserving:
|
| 2307 | *
|
| 2308 | * From above:
|
| 2309 | * b) TYPE field and SCOPE field set to the persistent reservation
|
| 2310 | * being created.
|
| 2311 | *
|
| 2312 | * Only one persistent reservation is allowed at a time per logical unit
|
| 2313 | * and that persistent reservation has a scope of LU_SCOPE.
|
| 2314 |
|
| 2315 | if (scope != PR_SCOPE_LU_SCOPE) {
|
| 2316 | pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
|
| 2317 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 2318 | goto out_put_pr_reg;
|
| 2319 | }
|
| 2320 | |
| 2321 | * See if we have an existing PR reservation holder pointer at
|
| 2322 | * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
|
| 2323 | * *pr_res_holder.
|
| 2324 |
|
| 2325 | spin_lock(&dev->dev_reservation_lock);
|
| 2326 | pr_res_holder = dev->dev_pr_res_holder;
|
| 2327 | if (pr_res_holder) {
|
| 2328 | |
| 2329 | * From spc4r17 Section 5.7.9: Reserving:
|
| 2330 | *
|
| 2331 | * If the device server receives a PERSISTENT RESERVE OUT
|
| 2332 | * command from an I_T nexus other than a persistent reservation
|
| 2333 | * holder (see 5.7.10) that attempts to create a persistent
|
| 2334 | * reservation when a persistent reservation already exists for
|
| 2335 | * the logical unit, then the command shall be completed with
|
| 2336 | * RESERVATION CONFLICT status.
|
| 2337 |
|
| 2338 | if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
| 2339 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 2340 | pr_err("SPC-3 PR: Attempted RESERVE from"
|
| 2341 | " [%s]: %s while reservation already held by"
|
| 2342 | " [%s]: %s, returning RESERVATION_CONFLICT\n",
|
| 2343 | cmd->se_tfo->fabric_name,
|
| 2344 | se_sess->se_node_acl->initiatorname,
|
| 2345 | pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
| 2346 | pr_res_holder->pr_reg_nacl->initiatorname);
|
| 2347 |
|
| 2348 | spin_unlock(&dev->dev_reservation_lock);
|
| 2349 | ret = TCM_RESERVATION_CONFLICT;
|
| 2350 | goto out_put_pr_reg;
|
| 2351 | }
|
| 2352 | |
| 2353 | * From spc4r17 Section 5.7.9: Reserving:
|
| 2354 | *
|
| 2355 | * If a persistent reservation holder attempts to modify the
|
| 2356 | * type or scope of an existing persistent reservation, the
|
| 2357 | * command shall be completed with RESERVATION CONFLICT status.
|
| 2358 |
|
| 2359 | if ((pr_res_holder->pr_res_type != type) ||
|
| 2360 | (pr_res_holder->pr_res_scope != scope)) {
|
| 2361 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 2362 | pr_err("SPC-3 PR: Attempted RESERVE from"
|
| 2363 | " [%s]: %s trying to change TYPE and/or SCOPE,"
|
| 2364 | " while reservation already held by [%s]: %s,"
|
| 2365 | " returning RESERVATION_CONFLICT\n",
|
| 2366 | cmd->se_tfo->fabric_name,
|
| 2367 | se_sess->se_node_acl->initiatorname,
|
| 2368 | pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
| 2369 | pr_res_holder->pr_reg_nacl->initiatorname);
|
| 2370 |
|
| 2371 | spin_unlock(&dev->dev_reservation_lock);
|
| 2372 | ret = TCM_RESERVATION_CONFLICT;
|
| 2373 | goto out_put_pr_reg;
|
| 2374 | }
|
| 2375 | |
| 2376 | * From spc4r17 Section 5.7.9: Reserving:
|
| 2377 | *
|
| 2378 | * If the device server receives a PERSISTENT RESERVE OUT
|
| 2379 | * command with RESERVE service action where the TYPE field and
|
| 2380 | * the SCOPE field contain the same values as the existing type
|
| 2381 | * and scope from a persistent reservation holder, it shall not
|
| 2382 | * make any change to the existing persistent reservation and
|
| 2383 | * shall completethe command with GOOD status.
|
| 2384 |
|
| 2385 | spin_unlock(&dev->dev_reservation_lock);
|
| 2386 | ret = 0;
|
| 2387 | goto out_put_pr_reg;
|
| 2388 | }
|
| 2389 | |
| 2390 | * Otherwise, our *pr_reg becomes the PR reservation holder for said
|
| 2391 | * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
|
| 2392 |
|
| 2393 | pr_reg->pr_res_scope = scope;
|
| 2394 | pr_reg->pr_res_type = type;
|
| 2395 | pr_reg->pr_res_holder = 1;
|
| 2396 | dev->dev_pr_res_holder = pr_reg;
|
| 2397 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 2398 |
|
| 2399 | pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
|
| 2400 | " reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
| 2401 | cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),
|
| 2402 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
| 2403 | pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
|
| 2404 | cmd->se_tfo->fabric_name,
|
| 2405 | se_sess->se_node_acl->initiatorname,
|
| 2406 | i_buf);
|
| 2407 | spin_unlock(&dev->dev_reservation_lock);
|
| 2408 |
|
| 2409 | if (pr_tmpl->pr_aptpl_active)
|
| 2410 | core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
| 2411 |
|
| 2412 | ret = 0;
|
| 2413 | out_put_pr_reg:
|
| 2414 | core_scsi3_put_pr_reg(pr_reg);
|
| 2415 | return ret;
|
| 2416 | }
|
| 2417 |
|
| 2418 | static sense_reason_t
|
| 2419 | core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
|
| 2420 | u64 res_key)
|
| 2421 | {
|
| 2422 | switch (type) {
|
| 2423 | case PR_TYPE_WRITE_EXCLUSIVE:
|
| 2424 | case PR_TYPE_EXCLUSIVE_ACCESS:
|
| 2425 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
| 2426 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
| 2427 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
| 2428 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
| 2429 | return core_scsi3_pro_reserve(cmd, type, scope, res_key);
|
| 2430 | default:
|
| 2431 | pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
|
| 2432 | " 0x%02x\n", type);
|
| 2433 | return TCM_INVALID_CDB_FIELD;
|
| 2434 | }
|
| 2435 | }
|
| 2436 |
|
| 2437 | static void __core_scsi3_complete_pro_release(
|
| 2438 | struct se_device *dev,
|
| 2439 | struct se_node_acl *se_nacl,
|
| 2440 | struct t10_pr_registration *pr_reg,
|
| 2441 | int explicit,
|
| 2442 | int unreg)
|
| 2443 | {
|
| 2444 | const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
|
| 2445 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 2446 | int pr_res_type = 0, pr_res_scope = 0;
|
| 2447 |
|
| 2448 | lockdep_assert_held(&dev->dev_reservation_lock);
|
| 2449 |
|
| 2450 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 2451 | |
| 2452 | * Go ahead and release the current PR reservation holder.
|
| 2453 | * If an All Registrants reservation is currently active and
|
| 2454 | * a unregister operation is requested, replace the current
|
| 2455 | * dev_pr_res_holder with another active registration.
|
| 2456 |
|
| 2457 | if (dev->dev_pr_res_holder) {
|
| 2458 | pr_res_type = dev->dev_pr_res_holder->pr_res_type;
|
| 2459 | pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
|
| 2460 | dev->dev_pr_res_holder->pr_res_type = 0;
|
| 2461 | dev->dev_pr_res_holder->pr_res_scope = 0;
|
| 2462 | dev->dev_pr_res_holder->pr_res_holder = 0;
|
| 2463 | dev->dev_pr_res_holder = NULL;
|
| 2464 | }
|
| 2465 | if (!unreg)
|
| 2466 | goto out;
|
| 2467 |
|
| 2468 | spin_lock(&dev->t10_pr.registration_lock);
|
| 2469 | list_del_init(&pr_reg->pr_reg_list);
|
| 2470 | |
| 2471 | * If the I_T nexus is a reservation holder, the persistent reservation
|
| 2472 | * is of an all registrants type, and the I_T nexus is the last remaining
|
| 2473 | * registered I_T nexus, then the device server shall also release the
|
| 2474 | * persistent reservation.
|
| 2475 |
|
| 2476 | if (!list_empty(&dev->t10_pr.registration_list) &&
|
| 2477 | ((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
| 2478 | (pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
|
| 2479 | dev->dev_pr_res_holder =
|
| 2480 | list_entry(dev->t10_pr.registration_list.next,
|
| 2481 | struct t10_pr_registration, pr_reg_list);
|
| 2482 | dev->dev_pr_res_holder->pr_res_type = pr_res_type;
|
| 2483 | dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
|
| 2484 | dev->dev_pr_res_holder->pr_res_holder = 1;
|
| 2485 | }
|
| 2486 | spin_unlock(&dev->t10_pr.registration_lock);
|
| 2487 | out:
|
| 2488 | if (!dev->dev_pr_res_holder) {
|
| 2489 | pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
|
| 2490 | " reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
| 2491 | tfo->fabric_name, (explicit) ? "explicit" :
|
| 2492 | "implicit", core_scsi3_pr_dump_type(pr_res_type),
|
| 2493 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
| 2494 | }
|
| 2495 | pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
|
| 2496 | tfo->fabric_name, se_nacl->initiatorname,
|
| 2497 | i_buf);
|
| 2498 | |
| 2499 | * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
|
| 2500 |
|
| 2501 | pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
|
| 2502 | }
|
| 2503 |
|
| 2504 | static sense_reason_t
|
| 2505 | core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
|
| 2506 | u64 res_key)
|
| 2507 | {
|
| 2508 | struct se_device *dev = cmd->se_dev;
|
| 2509 | struct se_session *se_sess = cmd->se_sess;
|
| 2510 | struct se_lun *se_lun = cmd->se_lun;
|
| 2511 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
|
| 2512 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 2513 | sense_reason_t ret = 0;
|
| 2514 |
|
| 2515 | if (!se_sess || !se_lun) {
|
| 2516 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
| 2517 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2518 | }
|
| 2519 | |
| 2520 | * Locate the existing *pr_reg via struct se_node_acl pointers
|
| 2521 |
|
| 2522 | pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
|
| 2523 | if (!pr_reg) {
|
| 2524 | pr_err("SPC-3 PR: Unable to locate"
|
| 2525 | " PR_REGISTERED *pr_reg for RELEASE\n");
|
| 2526 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2527 | }
|
| 2528 | |
| 2529 | * From spc4r17 Section 5.7.11.2 Releasing:
|
| 2530 | *
|
| 2531 | * If there is no persistent reservation or in response to a persistent
|
| 2532 | * reservation release request from a registered I_T nexus that is not a
|
| 2533 | * persistent reservation holder (see 5.7.10), the device server shall
|
| 2534 | * do the following:
|
| 2535 | *
|
| 2536 | * a) Not release the persistent reservation, if any;
|
| 2537 | * b) Not remove any registrations; and
|
| 2538 | * c) Complete the command with GOOD status.
|
| 2539 |
|
| 2540 | spin_lock(&dev->dev_reservation_lock);
|
| 2541 | pr_res_holder = dev->dev_pr_res_holder;
|
| 2542 | if (!pr_res_holder) {
|
| 2543 | |
| 2544 | * No persistent reservation, return GOOD status.
|
| 2545 |
|
| 2546 | spin_unlock(&dev->dev_reservation_lock);
|
| 2547 | goto out_put_pr_reg;
|
| 2548 | }
|
| 2549 |
|
| 2550 | if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
| 2551 | |
| 2552 | * Release request from a registered I_T nexus that is not a
|
| 2553 | * persistent reservation holder. return GOOD status.
|
| 2554 |
|
| 2555 | spin_unlock(&dev->dev_reservation_lock);
|
| 2556 | goto out_put_pr_reg;
|
| 2557 | }
|
| 2558 |
|
| 2559 | |
| 2560 | * From spc4r17 Section 5.7.11.2 Releasing:
|
| 2561 | *
|
| 2562 | * Only the persistent reservation holder (see 5.7.10) is allowed to
|
| 2563 | * release a persistent reservation.
|
| 2564 | *
|
| 2565 | * An application client releases the persistent reservation by issuing
|
| 2566 | * a PERSISTENT RESERVE OUT command with RELEASE service action through
|
| 2567 | * an I_T nexus that is a persistent reservation holder with the
|
| 2568 | * following parameters:
|
| 2569 | *
|
| 2570 | * a) RESERVATION KEY field set to the value of the reservation key
|
| 2571 | * that is registered with the logical unit for the I_T nexus;
|
| 2572 |
|
| 2573 | if (res_key != pr_reg->pr_res_key) {
|
| 2574 | pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
|
| 2575 | " does not match existing SA REGISTER res_key:"
|
| 2576 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
| 2577 | spin_unlock(&dev->dev_reservation_lock);
|
| 2578 | ret = TCM_RESERVATION_CONFLICT;
|
| 2579 | goto out_put_pr_reg;
|
| 2580 | }
|
| 2581 | |
| 2582 | * From spc4r17 Section 5.7.11.2 Releasing and above:
|
| 2583 | *
|
| 2584 | * b) TYPE field and SCOPE field set to match the persistent
|
| 2585 | * reservation being released.
|
| 2586 |
|
| 2587 | if ((pr_res_holder->pr_res_type != type) ||
|
| 2588 | (pr_res_holder->pr_res_scope != scope)) {
|
| 2589 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 2590 | pr_err("SPC-3 PR RELEASE: Attempted to release"
|
| 2591 | " reservation from [%s]: %s with different TYPE "
|
| 2592 | "and/or SCOPE while reservation already held by"
|
| 2593 | " [%s]: %s, returning RESERVATION_CONFLICT\n",
|
| 2594 | cmd->se_tfo->fabric_name,
|
| 2595 | se_sess->se_node_acl->initiatorname,
|
| 2596 | pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
| 2597 | pr_res_holder->pr_reg_nacl->initiatorname);
|
| 2598 |
|
| 2599 | spin_unlock(&dev->dev_reservation_lock);
|
| 2600 | ret = TCM_RESERVATION_CONFLICT;
|
| 2601 | goto out_put_pr_reg;
|
| 2602 | }
|
| 2603 | |
| 2604 | * In response to a persistent reservation release request from the
|
| 2605 | * persistent reservation holder the device server shall perform a
|
| 2606 | * release by doing the following as an uninterrupted series of actions:
|
| 2607 | * a) Release the persistent reservation;
|
| 2608 | * b) Not remove any registration(s);
|
| 2609 | * c) If the released persistent reservation is a registrants only type
|
| 2610 | * or all registrants type persistent reservation,
|
| 2611 | * the device server shall establish a unit attention condition for
|
| 2612 | * the initiator port associated with every regis-
|
| 2613 | * tered I_T nexus other than I_T nexus on which the PERSISTENT
|
| 2614 | * RESERVE OUT command with RELEASE service action was received,
|
| 2615 | * with the additional sense code set to RESERVATIONS RELEASED; and
|
| 2616 | * d) If the persistent reservation is of any other type, the device
|
| 2617 | * server shall not establish a unit attention condition.
|
| 2618 |
|
| 2619 | __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
|
| 2620 | pr_reg, 1, 0);
|
| 2621 |
|
| 2622 | spin_unlock(&dev->dev_reservation_lock);
|
| 2623 |
|
| 2624 | if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
|
| 2625 | (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
|
| 2626 | (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
|
| 2627 | (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
|
| 2628 | |
| 2629 | * If no UNIT ATTENTION conditions will be established for
|
| 2630 | * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
|
| 2631 | * go ahead and check for APTPL=1 update+write below
|
| 2632 |
|
| 2633 | goto write_aptpl;
|
| 2634 | }
|
| 2635 |
|
| 2636 | spin_lock(&pr_tmpl->registration_lock);
|
| 2637 | list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
|
| 2638 | pr_reg_list) {
|
| 2639 | |
| 2640 | * Do not establish a UNIT ATTENTION condition
|
| 2641 | * for the calling I_T Nexus
|
| 2642 |
|
| 2643 | if (pr_reg_p == pr_reg)
|
| 2644 | continue;
|
| 2645 |
|
| 2646 | target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
|
| 2647 | pr_reg_p->pr_res_mapped_lun,
|
| 2648 | 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
|
| 2649 | }
|
| 2650 | spin_unlock(&pr_tmpl->registration_lock);
|
| 2651 |
|
| 2652 | write_aptpl:
|
| 2653 | if (pr_tmpl->pr_aptpl_active)
|
| 2654 | core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
| 2655 |
|
| 2656 | out_put_pr_reg:
|
| 2657 | core_scsi3_put_pr_reg(pr_reg);
|
| 2658 | return ret;
|
| 2659 | }
|
| 2660 |
|
| 2661 | static sense_reason_t
|
| 2662 | core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
|
| 2663 | {
|
| 2664 | struct se_device *dev = cmd->se_dev;
|
| 2665 | struct se_node_acl *pr_reg_nacl;
|
| 2666 | struct se_session *se_sess = cmd->se_sess;
|
| 2667 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 2668 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
|
| 2669 | u64 pr_res_mapped_lun = 0;
|
| 2670 | int calling_it_nexus = 0;
|
| 2671 | |
| 2672 | * Locate the existing *pr_reg via struct se_node_acl pointers
|
| 2673 |
|
| 2674 | pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
|
| 2675 | se_sess->se_node_acl, se_sess);
|
| 2676 | if (!pr_reg_n) {
|
| 2677 | pr_err("SPC-3 PR: Unable to locate"
|
| 2678 | " PR_REGISTERED *pr_reg for CLEAR\n");
|
| 2679 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2680 | }
|
| 2681 | |
| 2682 | * From spc4r17 section 5.7.11.6, Clearing:
|
| 2683 | *
|
| 2684 | * Any application client may release the persistent reservation and
|
| 2685 | * remove all registrations from a device server by issuing a
|
| 2686 | * PERSISTENT RESERVE OUT command with CLEAR service action through a
|
| 2687 | * registered I_T nexus with the following parameter:
|
| 2688 | *
|
| 2689 | * a) RESERVATION KEY field set to the value of the reservation key
|
| 2690 | * that is registered with the logical unit for the I_T nexus.
|
| 2691 |
|
| 2692 | if (res_key != pr_reg_n->pr_res_key) {
|
| 2693 | pr_err("SPC-3 PR REGISTER: Received"
|
| 2694 | " res_key: 0x%016Lx does not match"
|
| 2695 | " existing SA REGISTER res_key:"
|
| 2696 | " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
|
| 2697 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2698 | return TCM_RESERVATION_CONFLICT;
|
| 2699 | }
|
| 2700 | |
| 2701 | * a) Release the persistent reservation, if any;
|
| 2702 |
|
| 2703 | spin_lock(&dev->dev_reservation_lock);
|
| 2704 | pr_res_holder = dev->dev_pr_res_holder;
|
| 2705 | if (pr_res_holder) {
|
| 2706 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 2707 | __core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
| 2708 | pr_res_holder, 0, 0);
|
| 2709 | }
|
| 2710 | spin_unlock(&dev->dev_reservation_lock);
|
| 2711 | |
| 2712 | * b) Remove all registration(s) (see spc4r17 5.7.7);
|
| 2713 |
|
| 2714 | spin_lock(&pr_tmpl->registration_lock);
|
| 2715 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 2716 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 2717 |
|
| 2718 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
| 2719 | pr_reg_nacl = pr_reg->pr_reg_nacl;
|
| 2720 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
| 2721 | __core_scsi3_free_registration(dev, pr_reg, NULL,
|
| 2722 | calling_it_nexus);
|
| 2723 | |
| 2724 | * e) Establish a unit attention condition for the initiator
|
| 2725 | * port associated with every registered I_T nexus other
|
| 2726 | * than the I_T nexus on which the PERSISTENT RESERVE OUT
|
| 2727 | * command with CLEAR service action was received, with the
|
| 2728 | * additional sense code set to RESERVATIONS PREEMPTED.
|
| 2729 |
|
| 2730 | if (!calling_it_nexus)
|
| 2731 | target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
|
| 2732 | 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
|
| 2733 | }
|
| 2734 | spin_unlock(&pr_tmpl->registration_lock);
|
| 2735 |
|
| 2736 | pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
|
| 2737 | cmd->se_tfo->fabric_name);
|
| 2738 |
|
| 2739 | core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
|
| 2740 |
|
| 2741 | core_scsi3_pr_generation(dev);
|
| 2742 | return 0;
|
| 2743 | }
|
| 2744 |
|
| 2745 | static void __core_scsi3_complete_pro_preempt(
|
| 2746 | struct se_device *dev,
|
| 2747 | struct t10_pr_registration *pr_reg,
|
| 2748 | struct list_head *preempt_and_abort_list,
|
| 2749 | int type,
|
| 2750 | int scope,
|
| 2751 | enum preempt_type preempt_type)
|
| 2752 | {
|
| 2753 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
| 2754 | const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
| 2755 | char i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 2756 |
|
| 2757 | lockdep_assert_held(&dev->dev_reservation_lock);
|
| 2758 |
|
| 2759 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 2760 | |
| 2761 | * Do an implicit RELEASE of the existing reservation.
|
| 2762 |
|
| 2763 | if (dev->dev_pr_res_holder)
|
| 2764 | __core_scsi3_complete_pro_release(dev, nacl,
|
| 2765 | dev->dev_pr_res_holder, 0, 0);
|
| 2766 |
|
| 2767 | dev->dev_pr_res_holder = pr_reg;
|
| 2768 | pr_reg->pr_res_holder = 1;
|
| 2769 | pr_reg->pr_res_type = type;
|
| 2770 | pr_reg->pr_res_scope = scope;
|
| 2771 |
|
| 2772 | pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
|
| 2773 | " reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
| 2774 | tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
|
| 2775 | core_scsi3_pr_dump_type(type),
|
| 2776 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
| 2777 | pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
|
| 2778 | tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
|
| 2779 | nacl->initiatorname, i_buf);
|
| 2780 | |
| 2781 | * For PREEMPT_AND_ABORT, add the preempting reservation's
|
| 2782 | * struct t10_pr_registration to the list that will be compared
|
| 2783 | * against received CDBs..
|
| 2784 |
|
| 2785 | if (preempt_and_abort_list)
|
| 2786 | list_add_tail(&pr_reg->pr_reg_abort_list,
|
| 2787 | preempt_and_abort_list);
|
| 2788 | }
|
| 2789 |
|
| 2790 | static void core_scsi3_release_preempt_and_abort(
|
| 2791 | struct list_head *preempt_and_abort_list,
|
| 2792 | struct t10_pr_registration *pr_reg_holder)
|
| 2793 | {
|
| 2794 | struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
| 2795 |
|
| 2796 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
|
| 2797 | pr_reg_abort_list) {
|
| 2798 |
|
| 2799 | list_del(&pr_reg->pr_reg_abort_list);
|
| 2800 | if (pr_reg_holder == pr_reg)
|
| 2801 | continue;
|
| 2802 | if (pr_reg->pr_res_holder) {
|
| 2803 | pr_warn("pr_reg->pr_res_holder still set\n");
|
| 2804 | continue;
|
| 2805 | }
|
| 2806 |
|
| 2807 | pr_reg->pr_reg_deve = NULL;
|
| 2808 | pr_reg->pr_reg_nacl = NULL;
|
| 2809 | kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
| 2810 | }
|
| 2811 | }
|
| 2812 |
|
| 2813 | static sense_reason_t
|
| 2814 | core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
|
| 2815 | u64 sa_res_key, enum preempt_type preempt_type)
|
| 2816 | {
|
| 2817 | struct se_device *dev = cmd->se_dev;
|
| 2818 | struct se_node_acl *pr_reg_nacl;
|
| 2819 | struct se_session *se_sess = cmd->se_sess;
|
| 2820 | LIST_HEAD(preempt_and_abort_list);
|
| 2821 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
|
| 2822 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 2823 | u64 pr_res_mapped_lun = 0;
|
| 2824 | int all_reg = 0, calling_it_nexus = 0;
|
| 2825 | bool sa_res_key_unmatched = sa_res_key != 0;
|
| 2826 | int prh_type = 0, prh_scope = 0;
|
| 2827 |
|
| 2828 | if (!se_sess)
|
| 2829 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 2830 |
|
| 2831 | pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
| 2832 | se_sess);
|
| 2833 | if (!pr_reg_n) {
|
| 2834 | pr_err("SPC-3 PR: Unable to locate"
|
| 2835 | " PR_REGISTERED *pr_reg for PREEMPT%s\n",
|
| 2836 | (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
|
| 2837 | return TCM_RESERVATION_CONFLICT;
|
| 2838 | }
|
| 2839 | if (pr_reg_n->pr_res_key != res_key) {
|
| 2840 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2841 | return TCM_RESERVATION_CONFLICT;
|
| 2842 | }
|
| 2843 |
|
| 2844 | spin_lock(&dev->dev_reservation_lock);
|
| 2845 | pr_res_holder = dev->dev_pr_res_holder;
|
| 2846 | if (pr_res_holder &&
|
| 2847 | ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
| 2848 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
|
| 2849 | all_reg = 1;
|
| 2850 |
|
| 2851 | if (!all_reg && !sa_res_key) {
|
| 2852 | spin_unlock(&dev->dev_reservation_lock);
|
| 2853 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2854 | return TCM_INVALID_PARAMETER_LIST;
|
| 2855 | }
|
| 2856 |
|
| 2857 |
|
| 2858 | if (pr_res_holder &&
|
| 2859 | (pr_res_holder->pr_res_key == sa_res_key ||
|
| 2860 | (all_reg && !sa_res_key))) {
|
| 2861 | switch (type) {
|
| 2862 | case PR_TYPE_WRITE_EXCLUSIVE:
|
| 2863 | case PR_TYPE_EXCLUSIVE_ACCESS:
|
| 2864 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
| 2865 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
| 2866 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
| 2867 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
| 2868 | break;
|
| 2869 | default:
|
| 2870 | pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
|
| 2871 | " Type: 0x%02x\n",
|
| 2872 | (preempt_type == PREEMPT_AND_ABORT) ?
|
| 2873 | "_AND_ABORT" : "", type);
|
| 2874 | spin_unlock(&dev->dev_reservation_lock);
|
| 2875 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2876 | return TCM_INVALID_CDB_FIELD;
|
| 2877 | }
|
| 2878 |
|
| 2879 | if (scope != PR_SCOPE_LU_SCOPE) {
|
| 2880 | pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
|
| 2881 | spin_unlock(&dev->dev_reservation_lock);
|
| 2882 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2883 | return TCM_INVALID_PARAMETER_LIST;
|
| 2884 | }
|
| 2885 | }
|
| 2886 |
|
| 2887 | |
| 2888 | * From spc4r17, section 5.7.11.4.4 Removing Registrations:
|
| 2889 | *
|
| 2890 | * If the SERVICE ACTION RESERVATION KEY field does not identify a
|
| 2891 | * persistent reservation holder or there is no persistent reservation
|
| 2892 | * holder (i.e., there is no persistent reservation), then the device
|
| 2893 | * server shall perform a preempt by doing the following in an
|
| 2894 | * uninterrupted series of actions. (See below..)
|
| 2895 |
|
| 2896 | if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
|
| 2897 | |
| 2898 | * No existing or SA Reservation Key matching reservations..
|
| 2899 | *
|
| 2900 | * PROUT SA PREEMPT with All Registrant type reservations are
|
| 2901 | * allowed to be processed without a matching SA Reservation Key
|
| 2902 |
|
| 2903 | spin_lock(&pr_tmpl->registration_lock);
|
| 2904 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 2905 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 2906 | |
| 2907 | * Removing of registrations in non all registrants
|
| 2908 | * type reservations without a matching SA reservation
|
| 2909 | * key.
|
| 2910 | *
|
| 2911 | * a) Remove the registrations for all I_T nexuses
|
| 2912 | * specified by the SERVICE ACTION RESERVATION KEY
|
| 2913 | * field;
|
| 2914 | * b) Ignore the contents of the SCOPE and TYPE fields;
|
| 2915 | * c) Process tasks as defined in 5.7.1; and
|
| 2916 | * d) Establish a unit attention condition for the
|
| 2917 | * initiator port associated with every I_T nexus
|
| 2918 | * that lost its registration other than the I_T
|
| 2919 | * nexus on which the PERSISTENT RESERVE OUT command
|
| 2920 | * was received, with the additional sense code set
|
| 2921 | * to REGISTRATIONS PREEMPTED.
|
| 2922 |
|
| 2923 | if (!all_reg) {
|
| 2924 | if (pr_reg->pr_res_key != sa_res_key)
|
| 2925 | continue;
|
| 2926 | sa_res_key_unmatched = false;
|
| 2927 |
|
| 2928 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
| 2929 | pr_reg_nacl = pr_reg->pr_reg_nacl;
|
| 2930 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
| 2931 | __core_scsi3_free_registration(dev, pr_reg,
|
| 2932 | (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
|
| 2933 | NULL, calling_it_nexus);
|
| 2934 | } else {
|
| 2935 | |
| 2936 | * Case for any existing all registrants type
|
| 2937 | * reservation, follow logic in spc4r17 section
|
| 2938 | * 5.7.11.4 Preempting, Table 52 and Figure 7.
|
| 2939 | *
|
| 2940 | * For a ZERO SA Reservation key, release
|
| 2941 | * all other registrations and do an implicit
|
| 2942 | * release of active persistent reservation.
|
| 2943 | *
|
| 2944 | * For a non-ZERO SA Reservation key, only
|
| 2945 | * release the matching reservation key from
|
| 2946 | * registrations.
|
| 2947 |
|
| 2948 | if ((sa_res_key) &&
|
| 2949 | (pr_reg->pr_res_key != sa_res_key))
|
| 2950 | continue;
|
| 2951 | sa_res_key_unmatched = false;
|
| 2952 |
|
| 2953 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
| 2954 | if (calling_it_nexus)
|
| 2955 | continue;
|
| 2956 |
|
| 2957 | pr_reg_nacl = pr_reg->pr_reg_nacl;
|
| 2958 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
| 2959 | __core_scsi3_free_registration(dev, pr_reg,
|
| 2960 | (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
|
| 2961 | NULL, 0);
|
| 2962 | }
|
| 2963 | if (!calling_it_nexus)
|
| 2964 | target_ua_allocate_lun(pr_reg_nacl,
|
| 2965 | pr_res_mapped_lun, 0x2A,
|
| 2966 | ASCQ_2AH_REGISTRATIONS_PREEMPTED);
|
| 2967 | }
|
| 2968 | spin_unlock(&pr_tmpl->registration_lock);
|
| 2969 | |
| 2970 | * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
|
| 2971 | * a PREEMPT AND ABORT service action sets the SERVICE ACTION
|
| 2972 | * RESERVATION KEY field to a value that does not match any
|
| 2973 | * registered reservation key, then the device server shall
|
| 2974 | * complete the command with RESERVATION CONFLICT status.
|
| 2975 |
|
| 2976 | if (sa_res_key_unmatched) {
|
| 2977 | spin_unlock(&dev->dev_reservation_lock);
|
| 2978 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 2979 | return TCM_RESERVATION_CONFLICT;
|
| 2980 | }
|
| 2981 | |
| 2982 | * For an existing all registrants type reservation
|
| 2983 | * with a zero SA rservation key, preempt the existing
|
| 2984 | * reservation with the new PR type and scope.
|
| 2985 |
|
| 2986 | if (pr_res_holder && all_reg && !(sa_res_key)) {
|
| 2987 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
|
| 2988 | (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
| 2989 | type, scope, preempt_type);
|
| 2990 | }
|
| 2991 |
|
| 2992 | spin_unlock(&dev->dev_reservation_lock);
|
| 2993 |
|
| 2994 | |
| 2995 | * SPC-4 5.12.11.2.6 Preempting and aborting
|
| 2996 | * The actions described in this subclause shall be performed
|
| 2997 | * for all I_T nexuses that are registered with the non-zero
|
| 2998 | * SERVICE ACTION RESERVATION KEY value, without regard for
|
| 2999 | * whether the preempted I_T nexuses hold the persistent
|
| 3000 | * reservation. If the SERVICE ACTION RESERVATION KEY field is
|
| 3001 | * set to zero and an all registrants persistent reservation is
|
| 3002 | * present, the device server shall abort all commands for all
|
| 3003 | * registered I_T nexuses.
|
| 3004 |
|
| 3005 | if (preempt_type == PREEMPT_AND_ABORT) {
|
| 3006 | core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list,
|
| 3007 | cmd);
|
| 3008 | core_scsi3_release_preempt_and_abort(
|
| 3009 | &preempt_and_abort_list, pr_reg_n);
|
| 3010 | }
|
| 3011 |
|
| 3012 | if (pr_tmpl->pr_aptpl_active)
|
| 3013 | core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
| 3014 |
|
| 3015 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 3016 | core_scsi3_pr_generation(cmd->se_dev);
|
| 3017 | return 0;
|
| 3018 | }
|
| 3019 | |
| 3020 | * The PREEMPTing SA reservation key matches that of the
|
| 3021 | * existing persistent reservation, first, we check if
|
| 3022 | * we are preempting our own reservation.
|
| 3023 | * From spc4r17, section 5.7.11.4.3 Preempting
|
| 3024 | * persistent reservations and registration handling
|
| 3025 | *
|
| 3026 | * If an all registrants persistent reservation is not
|
| 3027 | * present, it is not an error for the persistent
|
| 3028 | * reservation holder to preempt itself (i.e., a
|
| 3029 | * PERSISTENT RESERVE OUT with a PREEMPT service action
|
| 3030 | * or a PREEMPT AND ABORT service action with the
|
| 3031 | * SERVICE ACTION RESERVATION KEY value equal to the
|
| 3032 | * persistent reservation holder's reservation key that
|
| 3033 | * is received from the persistent reservation holder).
|
| 3034 | * In that case, the device server shall establish the
|
| 3035 | * new persistent reservation and maintain the
|
| 3036 | * registration.
|
| 3037 |
|
| 3038 | prh_type = pr_res_holder->pr_res_type;
|
| 3039 | prh_scope = pr_res_holder->pr_res_scope;
|
| 3040 | |
| 3041 | * If the SERVICE ACTION RESERVATION KEY field identifies a
|
| 3042 | * persistent reservation holder (see 5.7.10), the device
|
| 3043 | * server shall perform a preempt by doing the following as
|
| 3044 | * an uninterrupted series of actions:
|
| 3045 | *
|
| 3046 | * a) Release the persistent reservation for the holder
|
| 3047 | * identified by the SERVICE ACTION RESERVATION KEY field;
|
| 3048 |
|
| 3049 | if (pr_reg_n != pr_res_holder)
|
| 3050 | __core_scsi3_complete_pro_release(dev,
|
| 3051 | pr_res_holder->pr_reg_nacl,
|
| 3052 | dev->dev_pr_res_holder, 0, 0);
|
| 3053 | |
| 3054 | * b) Remove the registrations for all I_T nexuses identified
|
| 3055 | * by the SERVICE ACTION RESERVATION KEY field, except the
|
| 3056 | * I_T nexus that is being used for the PERSISTENT RESERVE
|
| 3057 | * OUT command. If an all registrants persistent reservation
|
| 3058 | * is present and the SERVICE ACTION RESERVATION KEY field
|
| 3059 | * is set to zero, then all registrations shall be removed
|
| 3060 | * except for that of the I_T nexus that is being used for
|
| 3061 | * the PERSISTENT RESERVE OUT command;
|
| 3062 |
|
| 3063 | spin_lock(&pr_tmpl->registration_lock);
|
| 3064 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 3065 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 3066 |
|
| 3067 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
| 3068 | if (calling_it_nexus)
|
| 3069 | continue;
|
| 3070 |
|
| 3071 | if (sa_res_key && pr_reg->pr_res_key != sa_res_key)
|
| 3072 | continue;
|
| 3073 |
|
| 3074 | pr_reg_nacl = pr_reg->pr_reg_nacl;
|
| 3075 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
| 3076 | __core_scsi3_free_registration(dev, pr_reg,
|
| 3077 | (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
| 3078 | calling_it_nexus);
|
| 3079 | |
| 3080 | * e) Establish a unit attention condition for the initiator
|
| 3081 | * port associated with every I_T nexus that lost its
|
| 3082 | * persistent reservation and/or registration, with the
|
| 3083 | * additional sense code set to REGISTRATIONS PREEMPTED;
|
| 3084 |
|
| 3085 | target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
|
| 3086 | ASCQ_2AH_REGISTRATIONS_PREEMPTED);
|
| 3087 | }
|
| 3088 | spin_unlock(&pr_tmpl->registration_lock);
|
| 3089 | |
| 3090 | * c) Establish a persistent reservation for the preempting
|
| 3091 | * I_T nexus using the contents of the SCOPE and TYPE fields;
|
| 3092 |
|
| 3093 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
|
| 3094 | (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
| 3095 | type, scope, preempt_type);
|
| 3096 | |
| 3097 | * d) Process tasks as defined in 5.7.1;
|
| 3098 | * e) See above..
|
| 3099 | * f) If the type or scope has changed, then for every I_T nexus
|
| 3100 | * whose reservation key was not removed, except for the I_T
|
| 3101 | * nexus on which the PERSISTENT RESERVE OUT command was
|
| 3102 | * received, the device server shall establish a unit
|
| 3103 | * attention condition for the initiator port associated with
|
| 3104 | * that I_T nexus, with the additional sense code set to
|
| 3105 | * RESERVATIONS RELEASED. If the type or scope have not
|
| 3106 | * changed, then no unit attention condition(s) shall be
|
| 3107 | * established for this reason.
|
| 3108 |
|
| 3109 | if ((prh_type != type) || (prh_scope != scope)) {
|
| 3110 | spin_lock(&pr_tmpl->registration_lock);
|
| 3111 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 3112 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 3113 |
|
| 3114 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
| 3115 | if (calling_it_nexus)
|
| 3116 | continue;
|
| 3117 |
|
| 3118 | target_ua_allocate_lun(pr_reg->pr_reg_nacl,
|
| 3119 | pr_reg->pr_res_mapped_lun, 0x2A,
|
| 3120 | ASCQ_2AH_RESERVATIONS_RELEASED);
|
| 3121 | }
|
| 3122 | spin_unlock(&pr_tmpl->registration_lock);
|
| 3123 | }
|
| 3124 | spin_unlock(&dev->dev_reservation_lock);
|
| 3125 | |
| 3126 | * Call LUN_RESET logic upon list of struct t10_pr_registration,
|
| 3127 | * All received CDBs for the matching existing reservation and
|
| 3128 | * registrations undergo ABORT_TASK logic.
|
| 3129 | *
|
| 3130 | * From there, core_scsi3_release_preempt_and_abort() will
|
| 3131 | * release every registration in the list (which have already
|
| 3132 | * been removed from the primary pr_reg list), except the
|
| 3133 | * new persistent reservation holder, the calling Initiator Port.
|
| 3134 |
|
| 3135 | if (preempt_type == PREEMPT_AND_ABORT) {
|
| 3136 | core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
|
| 3137 | core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
|
| 3138 | pr_reg_n);
|
| 3139 | }
|
| 3140 |
|
| 3141 | if (pr_tmpl->pr_aptpl_active)
|
| 3142 | core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
| 3143 |
|
| 3144 | core_scsi3_put_pr_reg(pr_reg_n);
|
| 3145 | core_scsi3_pr_generation(cmd->se_dev);
|
| 3146 | return 0;
|
| 3147 | }
|
| 3148 |
|
| 3149 | static sense_reason_t
|
| 3150 | core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
|
| 3151 | u64 sa_res_key, int aptpl, int unreg)
|
| 3152 | {
|
| 3153 | struct se_session *se_sess = cmd->se_sess;
|
| 3154 | struct se_device *dev = cmd->se_dev;
|
| 3155 | struct se_dev_entry *dest_se_deve = NULL;
|
| 3156 | struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
|
| 3157 | struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
|
| 3158 | struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
|
| 3159 | const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
|
| 3160 | struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
|
| 3161 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 3162 | unsigned char *buf;
|
| 3163 | unsigned char initiator_str[TRANSPORT_IQN_LEN];
|
| 3164 | char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
|
| 3165 | u32 tid_len, tmp_tid_len;
|
| 3166 | int new_reg = 0, type, scope, matching_iname;
|
| 3167 | sense_reason_t ret;
|
| 3168 | unsigned short rtpi;
|
| 3169 | unsigned char proto_ident;
|
| 3170 | bool tid_found;
|
| 3171 |
|
| 3172 | if (!se_sess || !se_lun) {
|
| 3173 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
| 3174 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3175 | }
|
| 3176 |
|
| 3177 | se_tpg = se_sess->se_tpg;
|
| 3178 | tf_ops = se_tpg->se_tpg_tfo;
|
| 3179 | |
| 3180 | * Follow logic from spc4r17 Section 5.7.8, Table 50 --
|
| 3181 | * Register behaviors for a REGISTER AND MOVE service action
|
| 3182 | *
|
| 3183 | * Locate the existing *pr_reg via struct se_node_acl pointers
|
| 3184 |
|
| 3185 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
| 3186 | se_sess);
|
| 3187 | if (!pr_reg) {
|
| 3188 | pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
|
| 3189 | " *pr_reg for REGISTER_AND_MOVE\n");
|
| 3190 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3191 | }
|
| 3192 | |
| 3193 | * The provided reservation key much match the existing reservation key
|
| 3194 | * provided during this initiator's I_T nexus registration.
|
| 3195 |
|
| 3196 | if (res_key != pr_reg->pr_res_key) {
|
| 3197 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
|
| 3198 | " res_key: 0x%016Lx does not match existing SA REGISTER"
|
| 3199 | " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
| 3200 | ret = TCM_RESERVATION_CONFLICT;
|
| 3201 | goto out_put_pr_reg;
|
| 3202 | }
|
| 3203 | |
| 3204 | * The service active reservation key needs to be non zero
|
| 3205 |
|
| 3206 | if (!sa_res_key) {
|
| 3207 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
|
| 3208 | " sa_res_key\n");
|
| 3209 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3210 | goto out_put_pr_reg;
|
| 3211 | }
|
| 3212 |
|
| 3213 | |
| 3214 | * Determine the Relative Target Port Identifier where the reservation
|
| 3215 | * will be moved to for the TransportID containing SCSI initiator WWN
|
| 3216 | * information.
|
| 3217 |
|
| 3218 | buf = transport_kmap_data_sg(cmd);
|
| 3219 | if (!buf) {
|
| 3220 | ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 3221 | goto out_put_pr_reg;
|
| 3222 | }
|
| 3223 |
|
| 3224 | rtpi = get_unaligned_be16(&buf[18]);
|
| 3225 | tid_len = get_unaligned_be32(&buf[20]);
|
| 3226 | transport_kunmap_data_sg(cmd);
|
| 3227 | buf = NULL;
|
| 3228 |
|
| 3229 | if ((tid_len + 24) != cmd->data_length) {
|
| 3230 | pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
|
| 3231 | " does not equal CDB data_length: %u\n", tid_len,
|
| 3232 | cmd->data_length);
|
| 3233 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3234 | goto out_put_pr_reg;
|
| 3235 | }
|
| 3236 |
|
| 3237 | spin_lock(&dev->se_port_lock);
|
| 3238 | list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
|
| 3239 | if (tmp_lun->lun_tpg->tpg_rtpi != rtpi)
|
| 3240 | continue;
|
| 3241 | dest_se_tpg = tmp_lun->lun_tpg;
|
| 3242 | dest_tf_ops = dest_se_tpg->se_tpg_tfo;
|
| 3243 | if (!dest_tf_ops)
|
| 3244 | continue;
|
| 3245 |
|
| 3246 | atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
|
| 3247 | spin_unlock(&dev->se_port_lock);
|
| 3248 |
|
| 3249 | if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
|
| 3250 | pr_err("core_scsi3_tpg_depend_item() failed"
|
| 3251 | " for dest_se_tpg\n");
|
| 3252 | atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
|
| 3253 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3254 | goto out_put_pr_reg;
|
| 3255 | }
|
| 3256 |
|
| 3257 | spin_lock(&dev->se_port_lock);
|
| 3258 | break;
|
| 3259 | }
|
| 3260 | spin_unlock(&dev->se_port_lock);
|
| 3261 |
|
| 3262 | if (!dest_se_tpg || !dest_tf_ops) {
|
| 3263 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
|
| 3264 | " fabric ops from Relative Target Port Identifier:"
|
| 3265 | " %hu\n", rtpi);
|
| 3266 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3267 | goto out_put_pr_reg;
|
| 3268 | }
|
| 3269 |
|
| 3270 | buf = transport_kmap_data_sg(cmd);
|
| 3271 | if (!buf) {
|
| 3272 | ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 3273 | goto out_put_pr_reg;
|
| 3274 | }
|
| 3275 | proto_ident = (buf[24] & 0x0f);
|
| 3276 |
|
| 3277 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
|
| 3278 | " 0x%02x\n", proto_ident);
|
| 3279 |
|
| 3280 | if (proto_ident != dest_se_tpg->proto_id) {
|
| 3281 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
|
| 3282 | " proto_ident: 0x%02x does not match ident: 0x%02x"
|
| 3283 | " from fabric: %s\n", proto_ident,
|
| 3284 | dest_se_tpg->proto_id,
|
| 3285 | dest_tf_ops->fabric_name);
|
| 3286 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3287 | goto out;
|
| 3288 | }
|
| 3289 | tid_found = target_parse_pr_out_transport_id(dest_se_tpg,
|
| 3290 | &buf[24], tid_len, &tmp_tid_len, &iport_ptr, initiator_str);
|
| 3291 | if (!tid_found) {
|
| 3292 | pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
|
| 3293 | " initiator_str from Transport ID\n");
|
| 3294 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3295 | goto out;
|
| 3296 | }
|
| 3297 |
|
| 3298 | pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
|
| 3299 | " %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?
|
| 3300 | "port" : "device", initiator_str, (iport_ptr != NULL) ?
|
| 3301 | iport_ptr : "");
|
| 3302 | |
| 3303 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
|
| 3304 | * action specifies a TransportID that is the same as the initiator port
|
| 3305 | * of the I_T nexus for the command received, then the command shall
|
| 3306 | * be terminated with CHECK CONDITION status, with the sense key set to
|
| 3307 | * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
|
| 3308 | * IN PARAMETER LIST.
|
| 3309 |
|
| 3310 | pr_reg_nacl = pr_reg->pr_reg_nacl;
|
| 3311 | matching_iname = (!strcmp(initiator_str,
|
| 3312 | pr_reg_nacl->initiatorname)) ? 1 : 0;
|
| 3313 | if (!matching_iname)
|
| 3314 | goto after_iport_check;
|
| 3315 |
|
| 3316 | if (!iport_ptr || !pr_reg->isid_present_at_reg) {
|
| 3317 | pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
|
| 3318 | " matches: %s on received I_T Nexus\n", initiator_str,
|
| 3319 | pr_reg_nacl->initiatorname);
|
| 3320 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3321 | goto out;
|
| 3322 | }
|
| 3323 | if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
|
| 3324 | pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
|
| 3325 | " matches: %s %s on received I_T Nexus\n",
|
| 3326 | initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
|
| 3327 | pr_reg->pr_reg_isid);
|
| 3328 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3329 | goto out;
|
| 3330 | }
|
| 3331 | after_iport_check:
|
| 3332 | |
| 3333 | * Locate the destination struct se_node_acl from the received Transport ID
|
| 3334 |
|
| 3335 | mutex_lock(&dest_se_tpg->acl_node_mutex);
|
| 3336 | dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
|
| 3337 | initiator_str);
|
| 3338 | if (dest_node_acl)
|
| 3339 | atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
|
| 3340 | mutex_unlock(&dest_se_tpg->acl_node_mutex);
|
| 3341 |
|
| 3342 | if (!dest_node_acl) {
|
| 3343 | pr_err("Unable to locate %s dest_node_acl for"
|
| 3344 | " TransportID%s\n", dest_tf_ops->fabric_name,
|
| 3345 | initiator_str);
|
| 3346 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3347 | goto out;
|
| 3348 | }
|
| 3349 |
|
| 3350 | if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
|
| 3351 | pr_err("core_scsi3_nodeacl_depend_item() for"
|
| 3352 | " dest_node_acl\n");
|
| 3353 | atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
|
| 3354 | dest_node_acl = NULL;
|
| 3355 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3356 | goto out;
|
| 3357 | }
|
| 3358 |
|
| 3359 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
|
| 3360 | " %s from TransportID\n", dest_tf_ops->fabric_name,
|
| 3361 | dest_node_acl->initiatorname);
|
| 3362 |
|
| 3363 | |
| 3364 | * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
|
| 3365 | * PORT IDENTIFIER.
|
| 3366 |
|
| 3367 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
|
| 3368 | if (!dest_se_deve) {
|
| 3369 | pr_err("Unable to locate %s dest_se_deve from RTPI:"
|
| 3370 | " %hu\n", dest_tf_ops->fabric_name, rtpi);
|
| 3371 | ret = TCM_INVALID_PARAMETER_LIST;
|
| 3372 | goto out;
|
| 3373 | }
|
| 3374 |
|
| 3375 | if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
|
| 3376 | pr_err("core_scsi3_lunacl_depend_item() failed\n");
|
| 3377 | kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
|
| 3378 | dest_se_deve = NULL;
|
| 3379 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3380 | goto out;
|
| 3381 | }
|
| 3382 |
|
| 3383 | pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
|
| 3384 | " ACL for dest_se_deve->mapped_lun: %llu\n",
|
| 3385 | dest_tf_ops->fabric_name, dest_node_acl->initiatorname,
|
| 3386 | dest_se_deve->mapped_lun);
|
| 3387 |
|
| 3388 | |
| 3389 | * A persistent reservation needs to already existing in order to
|
| 3390 | * successfully complete the REGISTER_AND_MOVE service action..
|
| 3391 |
|
| 3392 | spin_lock(&dev->dev_reservation_lock);
|
| 3393 | pr_res_holder = dev->dev_pr_res_holder;
|
| 3394 | if (!pr_res_holder) {
|
| 3395 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
|
| 3396 | " currently held\n");
|
| 3397 | spin_unlock(&dev->dev_reservation_lock);
|
| 3398 | ret = TCM_INVALID_CDB_FIELD;
|
| 3399 | goto out;
|
| 3400 | }
|
| 3401 | |
| 3402 | * The received on I_T Nexus must be the reservation holder.
|
| 3403 | *
|
| 3404 | * From spc4r17 section 5.7.8 Table 50 --
|
| 3405 | * Register behaviors for a REGISTER AND MOVE service action
|
| 3406 |
|
| 3407 | if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
| 3408 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
|
| 3409 | " Nexus is not reservation holder\n");
|
| 3410 | spin_unlock(&dev->dev_reservation_lock);
|
| 3411 | ret = TCM_RESERVATION_CONFLICT;
|
| 3412 | goto out;
|
| 3413 | }
|
| 3414 | |
| 3415 | * From spc4r17 section 5.7.8: registering and moving reservation
|
| 3416 | *
|
| 3417 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
|
| 3418 | * action is received and the established persistent reservation is a
|
| 3419 | * Write Exclusive - All Registrants type or Exclusive Access -
|
| 3420 | * All Registrants type reservation, then the command shall be completed
|
| 3421 | * with RESERVATION CONFLICT status.
|
| 3422 |
|
| 3423 | if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
| 3424 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
|
| 3425 | pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
|
| 3426 | " reservation for type: %s\n",
|
| 3427 | core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
|
| 3428 | spin_unlock(&dev->dev_reservation_lock);
|
| 3429 | ret = TCM_RESERVATION_CONFLICT;
|
| 3430 | goto out;
|
| 3431 | }
|
| 3432 | pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
| 3433 | |
| 3434 | * b) Ignore the contents of the (received) SCOPE and TYPE fields;
|
| 3435 |
|
| 3436 | type = pr_res_holder->pr_res_type;
|
| 3437 | scope = pr_res_holder->pr_res_type;
|
| 3438 | |
| 3439 | * c) Associate the reservation key specified in the SERVICE ACTION
|
| 3440 | * RESERVATION KEY field with the I_T nexus specified as the
|
| 3441 | * destination of the register and move, where:
|
| 3442 | * A) The I_T nexus is specified by the TransportID and the
|
| 3443 | * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
|
| 3444 | * B) Regardless of the TransportID format used, the association for
|
| 3445 | * the initiator port is based on either the initiator port name
|
| 3446 | * (see 3.1.71) on SCSI transport protocols where port names are
|
| 3447 | * required or the initiator port identifier (see 3.1.70) on SCSI
|
| 3448 | * transport protocols where port names are not required;
|
| 3449 | * d) Register the reservation key specified in the SERVICE ACTION
|
| 3450 | * RESERVATION KEY field;
|
| 3451 | *
|
| 3452 | * Also, It is not an error for a REGISTER AND MOVE service action to
|
| 3453 | * register an I_T nexus that is already registered with the same
|
| 3454 | * reservation key or a different reservation key.
|
| 3455 |
|
| 3456 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
| 3457 | iport_ptr);
|
| 3458 | if (!dest_pr_reg) {
|
| 3459 | struct se_lun *dest_lun = dest_se_deve->se_lun;
|
| 3460 |
|
| 3461 | spin_unlock(&dev->dev_reservation_lock);
|
| 3462 | if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
|
| 3463 | dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
|
| 3464 | iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
|
| 3465 | ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
| 3466 | goto out;
|
| 3467 | }
|
| 3468 | spin_lock(&dev->dev_reservation_lock);
|
| 3469 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
| 3470 | iport_ptr);
|
| 3471 | new_reg = 1;
|
| 3472 | } else {
|
| 3473 | |
| 3474 | * e) Retain the reservation key specified in the SERVICE ACTION
|
| 3475 | * RESERVATION KEY field and associated information;
|
| 3476 |
|
| 3477 | dest_pr_reg->pr_res_key = sa_res_key;
|
| 3478 | }
|
| 3479 | |
| 3480 | * f) Release the persistent reservation for the persistent reservation
|
| 3481 | * holder (i.e., the I_T nexus on which the
|
| 3482 |
|
| 3483 | __core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
| 3484 | dev->dev_pr_res_holder, 0, 0);
|
| 3485 | |
| 3486 | * g) Move the persistent reservation to the specified I_T nexus using
|
| 3487 | * the same scope and type as the persistent reservation released in
|
| 3488 | * item f); and
|
| 3489 |
|
| 3490 | dev->dev_pr_res_holder = dest_pr_reg;
|
| 3491 | dest_pr_reg->pr_res_holder = 1;
|
| 3492 | dest_pr_reg->pr_res_type = type;
|
| 3493 | pr_reg->pr_res_scope = scope;
|
| 3494 | core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
| 3495 | |
| 3496 | * Increment PRGeneration for existing registrations..
|
| 3497 |
|
| 3498 | if (!new_reg)
|
| 3499 | dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
|
| 3500 | spin_unlock(&dev->dev_reservation_lock);
|
| 3501 |
|
| 3502 | pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
|
| 3503 | " created new reservation holder TYPE: %s on object RTPI:"
|
| 3504 | " %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,
|
| 3505 | core_scsi3_pr_dump_type(type), rtpi,
|
| 3506 | dest_pr_reg->pr_res_generation);
|
| 3507 | pr_debug("SPC-3 PR Successfully moved reservation from"
|
| 3508 | " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
|
| 3509 | tf_ops->fabric_name, pr_reg_nacl->initiatorname,
|
| 3510 | i_buf, dest_tf_ops->fabric_name,
|
| 3511 | dest_node_acl->initiatorname, (iport_ptr != NULL) ?
|
| 3512 | iport_ptr : "");
|
| 3513 | |
| 3514 | * It is now safe to release configfs group dependencies for destination
|
| 3515 | * of Transport ID Initiator Device/Port Identifier
|
| 3516 |
|
| 3517 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 3518 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 3519 | core_scsi3_tpg_undepend_item(dest_se_tpg);
|
| 3520 | |
| 3521 | * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
|
| 3522 | * nexus on which PERSISTENT RESERVE OUT command was received.
|
| 3523 |
|
| 3524 | if (unreg) {
|
| 3525 | spin_lock(&pr_tmpl->registration_lock);
|
| 3526 | __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
|
| 3527 | spin_unlock(&pr_tmpl->registration_lock);
|
| 3528 | } else
|
| 3529 | core_scsi3_put_pr_reg(pr_reg);
|
| 3530 |
|
| 3531 | core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
|
| 3532 |
|
| 3533 | core_scsi3_put_pr_reg(dest_pr_reg);
|
| 3534 | |
| 3535 | * iport_ptr aliases the PR-OUT parameter list mapped above, so the
|
| 3536 | * buffer is unmapped only here on success (and at out: on error).
|
| 3537 |
|
| 3538 | transport_kunmap_data_sg(cmd);
|
| 3539 | return 0;
|
| 3540 | out:
|
| 3541 | if (buf)
|
| 3542 | transport_kunmap_data_sg(cmd);
|
| 3543 | if (dest_se_deve)
|
| 3544 | core_scsi3_lunacl_undepend_item(dest_se_deve);
|
| 3545 | if (dest_node_acl)
|
| 3546 | core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
| 3547 | core_scsi3_tpg_undepend_item(dest_se_tpg);
|
| 3548 |
|
| 3549 | out_put_pr_reg:
|
| 3550 | core_scsi3_put_pr_reg(pr_reg);
|
| 3551 | return ret;
|
| 3552 | }
|
| 3553 |
|
| 3554 | static sense_reason_t
|
| 3555 | target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key,
|
| 3556 | u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt)
|
| 3557 | {
|
| 3558 | struct exec_cmd_ops *ops = cmd->protocol_data;
|
| 3559 |
|
| 3560 | if (!cmd->se_sess || !cmd->se_lun) {
|
| 3561 | pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
| 3562 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3563 | }
|
| 3564 |
|
| 3565 | if (!ops->execute_pr_out) {
|
| 3566 | pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
|
| 3567 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 3568 | }
|
| 3569 |
|
| 3570 | switch (sa) {
|
| 3571 | case PRO_REGISTER_AND_MOVE:
|
| 3572 | case PRO_REPLACE_LOST_RESERVATION:
|
| 3573 | pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n");
|
| 3574 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 3575 | }
|
| 3576 |
|
| 3577 | if (spec_i_pt || all_tg_pt) {
|
| 3578 | pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n");
|
| 3579 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 3580 | }
|
| 3581 |
|
| 3582 | return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl);
|
| 3583 | }
|
| 3584 |
|
| 3585 | |
| 3586 | * See spc4r17 section 6.14 Table 170
|
| 3587 |
|
| 3588 | sense_reason_t
|
| 3589 | target_scsi3_emulate_pr_out(struct se_cmd *cmd)
|
| 3590 | {
|
| 3591 | struct se_device *dev = cmd->se_dev;
|
| 3592 | unsigned char *cdb = &cmd->t_task_cdb[0];
|
| 3593 | unsigned char *buf;
|
| 3594 | u64 res_key, sa_res_key;
|
| 3595 | int sa, scope, type, aptpl;
|
| 3596 | int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
|
| 3597 | sense_reason_t ret;
|
| 3598 |
|
| 3599 | |
| 3600 | * Following spc2r20 5.5.1 Reservations overview:
|
| 3601 | *
|
| 3602 | * If a logical unit has been reserved by any RESERVE command and is
|
| 3603 | * still reserved by any initiator, all PERSISTENT RESERVE IN and all
|
| 3604 | * PERSISTENT RESERVE OUT commands shall conflict regardless of
|
| 3605 | * initiator or service action and shall terminate with a RESERVATION
|
| 3606 | * CONFLICT status.
|
| 3607 |
|
| 3608 | if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
|
| 3609 | pr_err("Received PERSISTENT_RESERVE CDB while legacy"
|
| 3610 | " SPC-2 reservation is held, returning"
|
| 3611 | " RESERVATION_CONFLICT\n");
|
| 3612 | return TCM_RESERVATION_CONFLICT;
|
| 3613 | }
|
| 3614 |
|
| 3615 | |
| 3616 | * FIXME: A NULL struct se_session pointer means an this is not coming from
|
| 3617 | * a $FABRIC_MOD's nexus, but from internal passthrough ops.
|
| 3618 |
|
| 3619 | if (!cmd->se_sess)
|
| 3620 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3621 |
|
| 3622 | if (cmd->data_length < 24) {
|
| 3623 | pr_warn("SPC-PR: Received PR OUT parameter list"
|
| 3624 | " length too small: %u\n", cmd->data_length);
|
| 3625 | return TCM_PARAMETER_LIST_LENGTH_ERROR;
|
| 3626 | }
|
| 3627 |
|
| 3628 | |
| 3629 | * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
|
| 3630 |
|
| 3631 | sa = (cdb[1] & 0x1f);
|
| 3632 | scope = (cdb[2] & 0xf0);
|
| 3633 | type = (cdb[2] & 0x0f);
|
| 3634 |
|
| 3635 | buf = transport_kmap_data_sg(cmd);
|
| 3636 | if (!buf)
|
| 3637 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3638 |
|
| 3639 | |
| 3640 | * From PERSISTENT_RESERVE_OUT parameter list (payload)
|
| 3641 |
|
| 3642 | res_key = get_unaligned_be64(&buf[0]);
|
| 3643 | sa_res_key = get_unaligned_be64(&buf[8]);
|
| 3644 | |
| 3645 | * REGISTER_AND_MOVE uses a different SA parameter list containing
|
| 3646 | * SCSI TransportIDs.
|
| 3647 |
|
| 3648 | if (sa != PRO_REGISTER_AND_MOVE) {
|
| 3649 | spec_i_pt = (buf[20] & 0x08);
|
| 3650 | all_tg_pt = (buf[20] & 0x04);
|
| 3651 | aptpl = (buf[20] & 0x01);
|
| 3652 | } else {
|
| 3653 | aptpl = (buf[17] & 0x01);
|
| 3654 | unreg = (buf[17] & 0x02);
|
| 3655 | }
|
| 3656 | |
| 3657 | * If the backend device has been configured to force APTPL metadata
|
| 3658 | * write-out, go ahead and propigate aptpl=1 down now.
|
| 3659 |
|
| 3660 | if (dev->dev_attrib.force_pr_aptpl)
|
| 3661 | aptpl = 1;
|
| 3662 |
|
| 3663 | transport_kunmap_data_sg(cmd);
|
| 3664 | buf = NULL;
|
| 3665 |
|
| 3666 | |
| 3667 | * SPEC_I_PT=1 is only valid for Service action: REGISTER
|
| 3668 |
|
| 3669 | if (spec_i_pt && (sa != PRO_REGISTER))
|
| 3670 | return TCM_INVALID_PARAMETER_LIST;
|
| 3671 |
|
| 3672 | |
| 3673 | * From spc4r17 section 6.14:
|
| 3674 | *
|
| 3675 | * If the SPEC_I_PT bit is set to zero, the service action is not
|
| 3676 | * REGISTER AND MOVE, and the parameter list length is not 24, then
|
| 3677 | * the command shall be terminated with CHECK CONDITION status, with
|
| 3678 | * the sense key set to ILLEGAL REQUEST, and the additional sense
|
| 3679 | * code set to PARAMETER LIST LENGTH ERROR.
|
| 3680 |
|
| 3681 | if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
|
| 3682 | (cmd->data_length != 24)) {
|
| 3683 | pr_warn("SPC-PR: Received PR OUT illegal parameter"
|
| 3684 | " list length: %u\n", cmd->data_length);
|
| 3685 | return TCM_PARAMETER_LIST_LENGTH_ERROR;
|
| 3686 | }
|
| 3687 |
|
| 3688 | if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
|
| 3689 | ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type,
|
| 3690 | aptpl, all_tg_pt, spec_i_pt);
|
| 3691 | goto done;
|
| 3692 | }
|
| 3693 |
|
| 3694 | |
| 3695 | * (core_scsi3_emulate_pro_* function parameters
|
| 3696 | * are defined by spc4r17 Table 174:
|
| 3697 | * PERSISTENT_RESERVE_OUT service actions and valid parameters.
|
| 3698 |
|
| 3699 | switch (sa) {
|
| 3700 | case PRO_REGISTER:
|
| 3701 | ret = core_scsi3_emulate_pro_register(cmd,
|
| 3702 | res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
|
| 3703 | break;
|
| 3704 | case PRO_RESERVE:
|
| 3705 | ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
|
| 3706 | break;
|
| 3707 | case PRO_RELEASE:
|
| 3708 | ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
|
| 3709 | break;
|
| 3710 | case PRO_CLEAR:
|
| 3711 | ret = core_scsi3_emulate_pro_clear(cmd, res_key);
|
| 3712 | break;
|
| 3713 | case PRO_PREEMPT:
|
| 3714 | ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
|
| 3715 | res_key, sa_res_key, PREEMPT);
|
| 3716 | break;
|
| 3717 | case PRO_PREEMPT_AND_ABORT:
|
| 3718 | ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
|
| 3719 | res_key, sa_res_key, PREEMPT_AND_ABORT);
|
| 3720 | break;
|
| 3721 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
|
| 3722 | ret = core_scsi3_emulate_pro_register(cmd,
|
| 3723 | 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
|
| 3724 | break;
|
| 3725 | case PRO_REGISTER_AND_MOVE:
|
| 3726 | ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
|
| 3727 | sa_res_key, aptpl, unreg);
|
| 3728 | break;
|
| 3729 | default:
|
| 3730 | pr_err("Unknown PERSISTENT_RESERVE_OUT service"
|
| 3731 | " action: 0x%02x\n", sa);
|
| 3732 | return TCM_INVALID_CDB_FIELD;
|
| 3733 | }
|
| 3734 |
|
| 3735 | done:
|
| 3736 | if (!ret)
|
| 3737 | target_complete_cmd(cmd, SAM_STAT_GOOD);
|
| 3738 | return ret;
|
| 3739 | }
|
| 3740 |
|
| 3741 | |
| 3742 | * PERSISTENT_RESERVE_IN Service Action READ_KEYS
|
| 3743 | *
|
| 3744 | * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
|
| 3745 |
|
| 3746 | static sense_reason_t
|
| 3747 | core_scsi3_pri_read_keys(struct se_cmd *cmd)
|
| 3748 | {
|
| 3749 | struct se_device *dev = cmd->se_dev;
|
| 3750 | struct t10_pr_registration *pr_reg;
|
| 3751 | unsigned char *buf;
|
| 3752 | u32 add_len = 0, off = 8;
|
| 3753 |
|
| 3754 | if (cmd->data_length < 8) {
|
| 3755 | pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
|
| 3756 | " too small\n", cmd->data_length);
|
| 3757 | return TCM_INVALID_CDB_FIELD;
|
| 3758 | }
|
| 3759 |
|
| 3760 | buf = transport_kmap_data_sg(cmd);
|
| 3761 | if (!buf)
|
| 3762 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3763 |
|
| 3764 | put_unaligned_be32(dev->t10_pr.pr_generation, buf);
|
| 3765 |
|
| 3766 | spin_lock(&dev->t10_pr.registration_lock);
|
| 3767 | list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
|
| 3768 | pr_reg_list) {
|
| 3769 | |
| 3770 | * Check for overflow of 8byte PRI READ_KEYS payload and
|
| 3771 | * next reservation key list descriptor.
|
| 3772 |
|
| 3773 | if (off + 8 <= cmd->data_length) {
|
| 3774 | put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
|
| 3775 | off += 8;
|
| 3776 | }
|
| 3777 | |
| 3778 | * SPC5r17: 6.16.2 READ KEYS service action
|
| 3779 | * The ADDITIONAL LENGTH field indicates the number of bytes in
|
| 3780 | * the Reservation key list. The contents of the ADDITIONAL
|
| 3781 | * LENGTH field are not altered based on the allocation length
|
| 3782 |
|
| 3783 | add_len += 8;
|
| 3784 | }
|
| 3785 | spin_unlock(&dev->t10_pr.registration_lock);
|
| 3786 |
|
| 3787 | put_unaligned_be32(add_len, &buf[4]);
|
| 3788 | target_set_cmd_data_length(cmd, 8 + add_len);
|
| 3789 |
|
| 3790 | transport_kunmap_data_sg(cmd);
|
| 3791 |
|
| 3792 | return 0;
|
| 3793 | }
|
| 3794 |
|
| 3795 | |
| 3796 | * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
|
| 3797 | *
|
| 3798 | * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
|
| 3799 |
|
| 3800 | static sense_reason_t
|
| 3801 | core_scsi3_pri_read_reservation(struct se_cmd *cmd)
|
| 3802 | {
|
| 3803 | struct se_device *dev = cmd->se_dev;
|
| 3804 | struct t10_pr_registration *pr_reg;
|
| 3805 | unsigned char *buf;
|
| 3806 | u64 pr_res_key;
|
| 3807 | u32 add_len = 0;
|
| 3808 |
|
| 3809 | if (cmd->data_length < 8) {
|
| 3810 | pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
|
| 3811 | " too small\n", cmd->data_length);
|
| 3812 | return TCM_INVALID_CDB_FIELD;
|
| 3813 | }
|
| 3814 |
|
| 3815 | buf = transport_kmap_data_sg(cmd);
|
| 3816 | if (!buf)
|
| 3817 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3818 |
|
| 3819 | put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
|
| 3820 |
|
| 3821 | spin_lock(&dev->dev_reservation_lock);
|
| 3822 | pr_reg = dev->dev_pr_res_holder;
|
| 3823 | if (pr_reg) {
|
| 3824 | |
| 3825 | * Set the Additional Length to 16 when a reservation is held
|
| 3826 |
|
| 3827 | add_len = 16;
|
| 3828 | put_unaligned_be32(add_len, &buf[4]);
|
| 3829 |
|
| 3830 | if (cmd->data_length < 22)
|
| 3831 | goto err;
|
| 3832 |
|
| 3833 | |
| 3834 | * Set the Reservation key.
|
| 3835 | *
|
| 3836 | * From spc4r17, section 5.7.10:
|
| 3837 | * A persistent reservation holder has its reservation key
|
| 3838 | * returned in the parameter data from a PERSISTENT
|
| 3839 | * RESERVE IN command with READ RESERVATION service action as
|
| 3840 | * follows:
|
| 3841 | * a) For a persistent reservation of the type Write Exclusive
|
| 3842 | * - All Registrants or Exclusive Access All Regitrants,
|
| 3843 | * the reservation key shall be set to zero; or
|
| 3844 | * b) For all other persistent reservation types, the
|
| 3845 | * reservation key shall be set to the registered
|
| 3846 | * reservation key for the I_T nexus that holds the
|
| 3847 | * persistent reservation.
|
| 3848 |
|
| 3849 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
| 3850 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
|
| 3851 | pr_res_key = 0;
|
| 3852 | else
|
| 3853 | pr_res_key = pr_reg->pr_res_key;
|
| 3854 |
|
| 3855 | put_unaligned_be64(pr_res_key, &buf[8]);
|
| 3856 | |
| 3857 | * Set the SCOPE and TYPE
|
| 3858 |
|
| 3859 | buf[21] = (pr_reg->pr_res_scope & 0xf0) |
|
| 3860 | (pr_reg->pr_res_type & 0x0f);
|
| 3861 | }
|
| 3862 |
|
| 3863 | target_set_cmd_data_length(cmd, 8 + add_len);
|
| 3864 |
|
| 3865 | err:
|
| 3866 | spin_unlock(&dev->dev_reservation_lock);
|
| 3867 | transport_kunmap_data_sg(cmd);
|
| 3868 |
|
| 3869 | return 0;
|
| 3870 | }
|
| 3871 |
|
| 3872 | |
| 3873 | * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
|
| 3874 | *
|
| 3875 | * See spc4r17 section 6.13.4 Table 165
|
| 3876 |
|
| 3877 | static sense_reason_t
|
| 3878 | core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
|
| 3879 | {
|
| 3880 | struct se_device *dev = cmd->se_dev;
|
| 3881 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 3882 | unsigned char *buf;
|
| 3883 | u16 len = 8;
|
| 3884 |
|
| 3885 | if (cmd->data_length < 6) {
|
| 3886 | pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
|
| 3887 | " %u too small\n", cmd->data_length);
|
| 3888 | return TCM_INVALID_CDB_FIELD;
|
| 3889 | }
|
| 3890 |
|
| 3891 | buf = transport_kmap_data_sg(cmd);
|
| 3892 | if (!buf)
|
| 3893 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3894 |
|
| 3895 | put_unaligned_be16(len, &buf[0]);
|
| 3896 | buf[2] |= 0x10;
|
| 3897 | buf[2] |= 0x08;
|
| 3898 | buf[2] |= 0x04;
|
| 3899 | buf[2] |= 0x01;
|
| 3900 | |
| 3901 | * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
|
| 3902 | * set the TMV: Task Mask Valid bit.
|
| 3903 |
|
| 3904 | buf[3] |= 0x80;
|
| 3905 | |
| 3906 | * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
|
| 3907 |
|
| 3908 | buf[3] |= 0x10;
|
| 3909 | |
| 3910 | * PTPL_A: Persistence across Target Power Loss Active bit
|
| 3911 |
|
| 3912 | if (pr_tmpl->pr_aptpl_active)
|
| 3913 | buf[3] |= 0x01;
|
| 3914 | |
| 3915 | * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
|
| 3916 |
|
| 3917 | buf[4] |= 0x80;
|
| 3918 | buf[4] |= 0x40;
|
| 3919 | buf[4] |= 0x20;
|
| 3920 | buf[4] |= 0x08;
|
| 3921 | buf[4] |= 0x02;
|
| 3922 | buf[5] |= 0x01;
|
| 3923 |
|
| 3924 | target_set_cmd_data_length(cmd, len);
|
| 3925 |
|
| 3926 | transport_kunmap_data_sg(cmd);
|
| 3927 |
|
| 3928 | return 0;
|
| 3929 | }
|
| 3930 |
|
| 3931 | |
| 3932 | * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
|
| 3933 | *
|
| 3934 | * See spc4r17 section 6.13.5 Table 168 and 169
|
| 3935 |
|
| 3936 | static sense_reason_t
|
| 3937 | core_scsi3_pri_read_full_status(struct se_cmd *cmd)
|
| 3938 | {
|
| 3939 | struct se_device *dev = cmd->se_dev;
|
| 3940 | struct se_node_acl *se_nacl;
|
| 3941 | struct se_portal_group *se_tpg;
|
| 3942 | struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
| 3943 | struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
| 3944 | unsigned char *buf;
|
| 3945 | u32 add_desc_len = 0, add_len = 0;
|
| 3946 | u32 off = 8;
|
| 3947 | int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
|
| 3948 | int exp_desc_len, desc_len;
|
| 3949 | bool all_reg = false;
|
| 3950 |
|
| 3951 | if (cmd->data_length < 8) {
|
| 3952 | pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
|
| 3953 | " too small\n", cmd->data_length);
|
| 3954 | return TCM_INVALID_CDB_FIELD;
|
| 3955 | }
|
| 3956 |
|
| 3957 | buf = transport_kmap_data_sg(cmd);
|
| 3958 | if (!buf)
|
| 3959 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 3960 |
|
| 3961 | put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
|
| 3962 |
|
| 3963 | spin_lock(&dev->dev_reservation_lock);
|
| 3964 | if (dev->dev_pr_res_holder) {
|
| 3965 | struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
|
| 3966 |
|
| 3967 | if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
|
| 3968 | pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
|
| 3969 | all_reg = true;
|
| 3970 | pr_res_type = pr_holder->pr_res_type;
|
| 3971 | pr_res_scope = pr_holder->pr_res_scope;
|
| 3972 | }
|
| 3973 | }
|
| 3974 | spin_unlock(&dev->dev_reservation_lock);
|
| 3975 |
|
| 3976 | spin_lock(&pr_tmpl->registration_lock);
|
| 3977 | list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
| 3978 | &pr_tmpl->registration_list, pr_reg_list) {
|
| 3979 |
|
| 3980 | se_nacl = pr_reg->pr_reg_nacl;
|
| 3981 | se_tpg = pr_reg->pr_reg_nacl->se_tpg;
|
| 3982 | add_desc_len = 0;
|
| 3983 |
|
| 3984 | atomic_inc_mb(&pr_reg->pr_res_holders);
|
| 3985 | spin_unlock(&pr_tmpl->registration_lock);
|
| 3986 | |
| 3987 | * Determine expected length of $FABRIC_MOD specific
|
| 3988 | * TransportID full status descriptor..
|
| 3989 |
|
| 3990 | exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
|
| 3991 | &format_code);
|
| 3992 | if (exp_desc_len < 0 ||
|
| 3993 | exp_desc_len + add_len > cmd->data_length) {
|
| 3994 | pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
|
| 3995 | " out of buffer: %d\n", cmd->data_length);
|
| 3996 | spin_lock(&pr_tmpl->registration_lock);
|
| 3997 | atomic_dec_mb(&pr_reg->pr_res_holders);
|
| 3998 | break;
|
| 3999 | }
|
| 4000 | |
| 4001 | * Set RESERVATION KEY
|
| 4002 |
|
| 4003 | put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
|
| 4004 | off += 8;
|
| 4005 | off += 4;
|
| 4006 |
|
| 4007 | |
| 4008 | * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
|
| 4009 |
|
| 4010 | if (pr_reg->pr_reg_all_tg_pt)
|
| 4011 | buf[off] = 0x02;
|
| 4012 | |
| 4013 | * The struct se_lun pointer will be present for the
|
| 4014 | * reservation holder for PR_HOLDER bit.
|
| 4015 | *
|
| 4016 | * Also, if this registration is the reservation
|
| 4017 | * holder or there is an All Registrants reservation
|
| 4018 | * active, fill in SCOPE and TYPE in the next byte.
|
| 4019 |
|
| 4020 | if (pr_reg->pr_res_holder) {
|
| 4021 | buf[off++] |= 0x01;
|
| 4022 | buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
|
| 4023 | (pr_reg->pr_res_type & 0x0f);
|
| 4024 | } else if (all_reg) {
|
| 4025 | buf[off++] |= 0x01;
|
| 4026 | buf[off++] = (pr_res_scope & 0xf0) |
|
| 4027 | (pr_res_type & 0x0f);
|
| 4028 | } else {
|
| 4029 | off += 2;
|
| 4030 | }
|
| 4031 |
|
| 4032 | off += 4;
|
| 4033 | |
| 4034 | * From spc4r17 6.3.15:
|
| 4035 | *
|
| 4036 | * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
|
| 4037 | * IDENTIFIER field contains the relative port identifier (see
|
| 4038 | * 3.1.120) of the target port that is part of the I_T nexus
|
| 4039 | * described by this full status descriptor. If the ALL_TG_PT
|
| 4040 | * bit is set to one, the contents of the RELATIVE TARGET PORT
|
| 4041 | * IDENTIFIER field are not defined by this standard.
|
| 4042 |
|
| 4043 | if (!pr_reg->pr_reg_all_tg_pt) {
|
| 4044 | u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
|
| 4045 |
|
| 4046 | put_unaligned_be16(sep_rtpi, &buf[off]);
|
| 4047 | off += 2;
|
| 4048 | } else
|
| 4049 | off += 2;
|
| 4050 |
|
| 4051 | buf[off+4] = se_tpg->proto_id;
|
| 4052 |
|
| 4053 | |
| 4054 | * Now, have the $FABRIC_MOD fill in the transport ID.
|
| 4055 |
|
| 4056 | desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
|
| 4057 | &format_code, &buf[off+4]);
|
| 4058 |
|
| 4059 | spin_lock(&pr_tmpl->registration_lock);
|
| 4060 | atomic_dec_mb(&pr_reg->pr_res_holders);
|
| 4061 |
|
| 4062 | if (desc_len < 0)
|
| 4063 | break;
|
| 4064 | |
| 4065 | * Set the ADDITIONAL DESCRIPTOR LENGTH
|
| 4066 |
|
| 4067 | put_unaligned_be32(desc_len, &buf[off]);
|
| 4068 | off += 4;
|
| 4069 | |
| 4070 | * Size of full desctipor header minus TransportID
|
| 4071 | * containing $FABRIC_MOD specific) initiator device/port
|
| 4072 | * WWN information.
|
| 4073 | *
|
| 4074 | * See spc4r17 Section 6.13.5 Table 169
|
| 4075 |
|
| 4076 | add_desc_len = (24 + desc_len);
|
| 4077 |
|
| 4078 | off += desc_len;
|
| 4079 | add_len += add_desc_len;
|
| 4080 | }
|
| 4081 | spin_unlock(&pr_tmpl->registration_lock);
|
| 4082 | |
| 4083 | * Set ADDITIONAL_LENGTH
|
| 4084 |
|
| 4085 | put_unaligned_be32(add_len, &buf[4]);
|
| 4086 | target_set_cmd_data_length(cmd, 8 + add_len);
|
| 4087 |
|
| 4088 | transport_kunmap_data_sg(cmd);
|
| 4089 |
|
| 4090 | return 0;
|
| 4091 | }
|
| 4092 |
|
| 4093 | static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa)
|
| 4094 | {
|
| 4095 | struct exec_cmd_ops *ops = cmd->protocol_data;
|
| 4096 | unsigned char *buf;
|
| 4097 | sense_reason_t ret;
|
| 4098 |
|
| 4099 | if (cmd->data_length < 8) {
|
| 4100 | pr_err("PRIN SA SCSI Data Length: %u too small\n",
|
| 4101 | cmd->data_length);
|
| 4102 | return TCM_INVALID_CDB_FIELD;
|
| 4103 | }
|
| 4104 |
|
| 4105 | if (!ops->execute_pr_in) {
|
| 4106 | pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
|
| 4107 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 4108 | }
|
| 4109 |
|
| 4110 | if (sa == PRI_READ_FULL_STATUS) {
|
| 4111 | pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n");
|
| 4112 | return TCM_UNSUPPORTED_SCSI_OPCODE;
|
| 4113 | }
|
| 4114 |
|
| 4115 | buf = transport_kmap_data_sg(cmd);
|
| 4116 | if (!buf)
|
| 4117 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
| 4118 |
|
| 4119 | ret = ops->execute_pr_in(cmd, sa, buf);
|
| 4120 |
|
| 4121 | transport_kunmap_data_sg(cmd);
|
| 4122 | return ret;
|
| 4123 | }
|
| 4124 |
|
| 4125 | sense_reason_t
|
| 4126 | target_scsi3_emulate_pr_in(struct se_cmd *cmd)
|
| 4127 | {
|
| 4128 | u8 sa = cmd->t_task_cdb[1] & 0x1f;
|
| 4129 | sense_reason_t ret;
|
| 4130 |
|
| 4131 | |
| 4132 | * Following spc2r20 5.5.1 Reservations overview:
|
| 4133 | *
|
| 4134 | * If a logical unit has been reserved by any RESERVE command and is
|
| 4135 | * still reserved by any initiator, all PERSISTENT RESERVE IN and all
|
| 4136 | * PERSISTENT RESERVE OUT commands shall conflict regardless of
|
| 4137 | * initiator or service action and shall terminate with a RESERVATION
|
| 4138 | * CONFLICT status.
|
| 4139 |
|
| 4140 | if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
|
| 4141 | pr_err("Received PERSISTENT_RESERVE CDB while legacy"
|
| 4142 | " SPC-2 reservation is held, returning"
|
| 4143 | " RESERVATION_CONFLICT\n");
|
| 4144 | return TCM_RESERVATION_CONFLICT;
|
| 4145 | }
|
| 4146 |
|
| 4147 | if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
|
| 4148 | ret = target_try_pr_in_pt(cmd, sa);
|
| 4149 | goto done;
|
| 4150 | }
|
| 4151 |
|
| 4152 | switch (sa) {
|
| 4153 | case PRI_READ_KEYS:
|
| 4154 | ret = core_scsi3_pri_read_keys(cmd);
|
| 4155 | break;
|
| 4156 | case PRI_READ_RESERVATION:
|
| 4157 | ret = core_scsi3_pri_read_reservation(cmd);
|
| 4158 | break;
|
| 4159 | case PRI_REPORT_CAPABILITIES:
|
| 4160 | ret = core_scsi3_pri_report_capabilities(cmd);
|
| 4161 | break;
|
| 4162 | case PRI_READ_FULL_STATUS:
|
| 4163 | ret = core_scsi3_pri_read_full_status(cmd);
|
| 4164 | break;
|
| 4165 | default:
|
| 4166 | pr_err("Unknown PERSISTENT_RESERVE_IN service"
|
| 4167 | " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
|
| 4168 | return TCM_INVALID_CDB_FIELD;
|
| 4169 | }
|
| 4170 |
|
| 4171 | done:
|
| 4172 | if (!ret)
|
| 4173 | target_complete_cmd(cmd, SAM_STAT_GOOD);
|
| 4174 | return ret;
|
| 4175 | }
|
| 4176 |
|
| 4177 | sense_reason_t
|
| 4178 | target_check_reservation(struct se_cmd *cmd)
|
| 4179 | {
|
| 4180 | struct se_device *dev = cmd->se_dev;
|
| 4181 | sense_reason_t ret;
|
| 4182 |
|
| 4183 | if (!cmd->se_sess)
|
| 4184 | return 0;
|
| 4185 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
|
| 4186 | return 0;
|
| 4187 | if (!dev->dev_attrib.emulate_pr)
|
| 4188 | return 0;
|
| 4189 | if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
|
| 4190 | return 0;
|
| 4191 |
|
| 4192 | spin_lock(&dev->dev_reservation_lock);
|
| 4193 | if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
|
| 4194 | ret = target_scsi2_reservation_check(cmd);
|
| 4195 | else
|
| 4196 | ret = target_scsi3_pr_reservation_check(cmd);
|
| 4197 | spin_unlock(&dev->dev_reservation_lock);
|
| 4198 |
|
| 4199 | return ret;
|
| 4200 | }
|