Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_pr.c |
| 3 | * |
| 4 | * This file contains SPC-3 compliant persistent reservations and |
| 5 | * legacy SPC-2 reservations with compatible reservation handling (CRH=1) |
| 6 | * |
| 7 | * Copyright (c) 2009, 2010 Rising Tide Systems |
| 8 | * Copyright (c) 2009, 2010 Linux-iSCSI.org |
| 9 | * |
| 10 | * Nicholas A. Bellinger <nab@kernel.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | * |
| 26 | ******************************************************************************/ |
| 27 | |
| 28 | #include <linux/version.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <scsi/scsi.h> |
| 33 | #include <scsi/scsi_cmnd.h> |
| 34 | #include <asm/unaligned.h> |
| 35 | |
| 36 | #include <target/target_core_base.h> |
| 37 | #include <target/target_core_device.h> |
| 38 | #include <target/target_core_tmr.h> |
| 39 | #include <target/target_core_tpg.h> |
| 40 | #include <target/target_core_transport.h> |
| 41 | #include <target/target_core_fabric_ops.h> |
| 42 | #include <target/target_core_configfs.h> |
| 43 | |
| 44 | #include "target_core_hba.h" |
| 45 | #include "target_core_pr.h" |
| 46 | #include "target_core_ua.h" |
| 47 | |
| 48 | /* |
| 49 | * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) |
| 50 | */ |
| 51 | struct pr_transport_id_holder { |
| 52 | int dest_local_nexus; |
| 53 | struct t10_pr_registration *dest_pr_reg; |
| 54 | struct se_portal_group *dest_tpg; |
| 55 | struct se_node_acl *dest_node_acl; |
| 56 | struct se_dev_entry *dest_se_deve; |
| 57 | struct list_head dest_list; |
| 58 | }; |
| 59 | |
| 60 | int core_pr_dump_initiator_port( |
| 61 | struct t10_pr_registration *pr_reg, |
| 62 | char *buf, |
| 63 | u32 size) |
| 64 | { |
| 65 | if (!(pr_reg->isid_present_at_reg)) |
| 66 | return 0; |
| 67 | |
| 68 | snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); |
| 69 | return 1; |
| 70 | } |
| 71 | |
| 72 | static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, |
| 73 | struct t10_pr_registration *, int); |
| 74 | |
| 75 | static int core_scsi2_reservation_seq_non_holder( |
| 76 | struct se_cmd *cmd, |
| 77 | unsigned char *cdb, |
| 78 | u32 pr_reg_type) |
| 79 | { |
| 80 | switch (cdb[0]) { |
| 81 | case INQUIRY: |
| 82 | case RELEASE: |
| 83 | case RELEASE_10: |
| 84 | return 0; |
| 85 | default: |
| 86 | return 1; |
| 87 | } |
| 88 | |
| 89 | return 1; |
| 90 | } |
| 91 | |
| 92 | static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type) |
| 93 | { |
| 94 | struct se_device *dev = cmd->se_dev; |
| 95 | struct se_session *sess = cmd->se_sess; |
| 96 | int ret; |
| 97 | |
| 98 | if (!(sess)) |
| 99 | return 0; |
| 100 | |
| 101 | spin_lock(&dev->dev_reservation_lock); |
| 102 | if (!dev->dev_reserved_node_acl || !sess) { |
| 103 | spin_unlock(&dev->dev_reservation_lock); |
| 104 | return 0; |
| 105 | } |
| 106 | if (dev->dev_reserved_node_acl != sess->se_node_acl) { |
| 107 | spin_unlock(&dev->dev_reservation_lock); |
| 108 | return -1; |
| 109 | } |
| 110 | if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) { |
| 111 | spin_unlock(&dev->dev_reservation_lock); |
| 112 | return 0; |
| 113 | } |
| 114 | ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -1; |
| 115 | spin_unlock(&dev->dev_reservation_lock); |
| 116 | |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | static int core_scsi2_reservation_release(struct se_cmd *cmd) |
| 121 | { |
| 122 | struct se_device *dev = cmd->se_dev; |
| 123 | struct se_session *sess = cmd->se_sess; |
| 124 | struct se_portal_group *tpg = sess->se_tpg; |
| 125 | |
| 126 | if (!(sess) || !(tpg)) |
| 127 | return 0; |
| 128 | |
| 129 | spin_lock(&dev->dev_reservation_lock); |
| 130 | if (!dev->dev_reserved_node_acl || !sess) { |
| 131 | spin_unlock(&dev->dev_reservation_lock); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | if (dev->dev_reserved_node_acl != sess->se_node_acl) { |
| 136 | spin_unlock(&dev->dev_reservation_lock); |
| 137 | return 0; |
| 138 | } |
| 139 | dev->dev_reserved_node_acl = NULL; |
| 140 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; |
| 141 | if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { |
| 142 | dev->dev_res_bin_isid = 0; |
| 143 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; |
| 144 | } |
| 145 | printk(KERN_INFO "SCSI-2 Released reservation for %s LUN: %u ->" |
| 146 | " MAPPED LUN: %u for %s\n", TPG_TFO(tpg)->get_fabric_name(), |
| 147 | SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun, |
| 148 | sess->se_node_acl->initiatorname); |
| 149 | spin_unlock(&dev->dev_reservation_lock); |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int core_scsi2_reservation_reserve(struct se_cmd *cmd) |
| 155 | { |
| 156 | struct se_device *dev = cmd->se_dev; |
| 157 | struct se_session *sess = cmd->se_sess; |
| 158 | struct se_portal_group *tpg = sess->se_tpg; |
| 159 | |
| 160 | if ((T_TASK(cmd)->t_task_cdb[1] & 0x01) && |
| 161 | (T_TASK(cmd)->t_task_cdb[1] & 0x02)) { |
| 162 | printk(KERN_ERR "LongIO and Obselete Bits set, returning" |
| 163 | " ILLEGAL_REQUEST\n"); |
| 164 | return PYX_TRANSPORT_ILLEGAL_REQUEST; |
| 165 | } |
| 166 | /* |
| 167 | * This is currently the case for target_core_mod passthrough struct se_cmd |
| 168 | * ops |
| 169 | */ |
| 170 | if (!(sess) || !(tpg)) |
| 171 | return 0; |
| 172 | |
| 173 | spin_lock(&dev->dev_reservation_lock); |
| 174 | if (dev->dev_reserved_node_acl && |
| 175 | (dev->dev_reserved_node_acl != sess->se_node_acl)) { |
| 176 | printk(KERN_ERR "SCSI-2 RESERVATION CONFLIFT for %s fabric\n", |
| 177 | TPG_TFO(tpg)->get_fabric_name()); |
| 178 | printk(KERN_ERR "Original reserver LUN: %u %s\n", |
| 179 | SE_LUN(cmd)->unpacked_lun, |
| 180 | dev->dev_reserved_node_acl->initiatorname); |
| 181 | printk(KERN_ERR "Current attempt - LUN: %u -> MAPPED LUN: %u" |
| 182 | " from %s \n", SE_LUN(cmd)->unpacked_lun, |
| 183 | cmd->se_deve->mapped_lun, |
| 184 | sess->se_node_acl->initiatorname); |
| 185 | spin_unlock(&dev->dev_reservation_lock); |
| 186 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 187 | } |
| 188 | |
| 189 | dev->dev_reserved_node_acl = sess->se_node_acl; |
| 190 | dev->dev_flags |= DF_SPC2_RESERVATIONS; |
| 191 | if (sess->sess_bin_isid != 0) { |
| 192 | dev->dev_res_bin_isid = sess->sess_bin_isid; |
| 193 | dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; |
| 194 | } |
| 195 | printk(KERN_INFO "SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" |
| 196 | " for %s\n", TPG_TFO(tpg)->get_fabric_name(), |
| 197 | SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun, |
| 198 | sess->se_node_acl->initiatorname); |
| 199 | spin_unlock(&dev->dev_reservation_lock); |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, |
| 205 | struct se_node_acl *, struct se_session *); |
| 206 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *); |
| 207 | |
| 208 | /* |
| 209 | * Setup in target_core_transport.c:transport_generic_cmd_sequencer() |
| 210 | * and called via struct se_cmd->transport_emulate_cdb() in TCM processing |
| 211 | * thread context. |
| 212 | */ |
| 213 | int core_scsi2_emulate_crh(struct se_cmd *cmd) |
| 214 | { |
| 215 | struct se_session *se_sess = cmd->se_sess; |
| 216 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
| 217 | struct t10_pr_registration *pr_reg; |
| 218 | struct t10_reservation_template *pr_tmpl = &su_dev->t10_reservation; |
| 219 | unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0]; |
| 220 | int crh = (T10_RES(su_dev)->res_type == SPC3_PERSISTENT_RESERVATIONS); |
| 221 | int conflict = 0; |
| 222 | |
| 223 | if (!(se_sess)) |
| 224 | return 0; |
| 225 | |
| 226 | if (!(crh)) |
| 227 | goto after_crh; |
| 228 | |
| 229 | pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
| 230 | se_sess); |
| 231 | if (pr_reg) { |
| 232 | /* |
| 233 | * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE |
| 234 | * behavior |
| 235 | * |
| 236 | * A RESERVE(6) or RESERVE(10) command shall complete with GOOD |
| 237 | * status, but no reservation shall be established and the |
| 238 | * persistent reservation shall not be changed, if the command |
| 239 | * is received from a) and b) below. |
| 240 | * |
| 241 | * A RELEASE(6) or RELEASE(10) command shall complete with GOOD |
| 242 | * status, but the persistent reservation shall not be released, |
| 243 | * if the command is received from a) and b) |
| 244 | * |
| 245 | * a) An I_T nexus that is a persistent reservation holder; or |
| 246 | * b) An I_T nexus that is registered if a registrants only or |
| 247 | * all registrants type persistent reservation is present. |
| 248 | * |
| 249 | * In all other cases, a RESERVE(6) command, RESERVE(10) command, |
| 250 | * RELEASE(6) command, or RELEASE(10) command shall be processed |
| 251 | * as defined in SPC-2. |
| 252 | */ |
| 253 | if (pr_reg->pr_res_holder) { |
| 254 | core_scsi3_put_pr_reg(pr_reg); |
| 255 | return 0; |
| 256 | } |
| 257 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || |
| 258 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || |
| 259 | (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| 260 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
| 261 | core_scsi3_put_pr_reg(pr_reg); |
| 262 | return 0; |
| 263 | } |
| 264 | core_scsi3_put_pr_reg(pr_reg); |
| 265 | conflict = 1; |
| 266 | } else { |
| 267 | /* |
| 268 | * Following spc2r20 5.5.1 Reservations overview: |
| 269 | * |
| 270 | * If a logical unit has executed a PERSISTENT RESERVE OUT |
| 271 | * command with the REGISTER or the REGISTER AND IGNORE |
| 272 | * EXISTING KEY service action and is still registered by any |
| 273 | * initiator, all RESERVE commands and all RELEASE commands |
| 274 | * regardless of initiator shall conflict and shall terminate |
| 275 | * with a RESERVATION CONFLICT status. |
| 276 | */ |
| 277 | spin_lock(&pr_tmpl->registration_lock); |
| 278 | conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; |
| 279 | spin_unlock(&pr_tmpl->registration_lock); |
| 280 | } |
| 281 | |
| 282 | if (conflict) { |
| 283 | printk(KERN_ERR "Received legacy SPC-2 RESERVE/RELEASE" |
| 284 | " while active SPC-3 registrations exist," |
| 285 | " returning RESERVATION_CONFLICT\n"); |
| 286 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 287 | } |
| 288 | |
| 289 | after_crh: |
| 290 | if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10)) |
| 291 | return core_scsi2_reservation_reserve(cmd); |
| 292 | else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10)) |
| 293 | return core_scsi2_reservation_release(cmd); |
| 294 | else |
| 295 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Begin SPC-3/SPC-4 Persistent Reservations emulation support |
| 300 | * |
| 301 | * This function is called by those initiator ports who are *NOT* |
| 302 | * the active PR reservation holder when a reservation is present. |
| 303 | */ |
| 304 | static int core_scsi3_pr_seq_non_holder( |
| 305 | struct se_cmd *cmd, |
| 306 | unsigned char *cdb, |
| 307 | u32 pr_reg_type) |
| 308 | { |
| 309 | struct se_dev_entry *se_deve; |
| 310 | struct se_session *se_sess = SE_SESS(cmd); |
| 311 | int other_cdb = 0, ignore_reg; |
| 312 | int registered_nexus = 0, ret = 1; /* Conflict by default */ |
| 313 | int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ |
| 314 | int we = 0; /* Write Exclusive */ |
| 315 | int legacy = 0; /* Act like a legacy device and return |
| 316 | * RESERVATION CONFLICT on some CDBs */ |
| 317 | /* |
| 318 | * A legacy SPC-2 reservation is being held. |
| 319 | */ |
| 320 | if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) |
| 321 | return core_scsi2_reservation_seq_non_holder(cmd, |
| 322 | cdb, pr_reg_type); |
| 323 | |
| 324 | se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 325 | /* |
| 326 | * Determine if the registration should be ignored due to |
| 327 | * non-matching ISIDs in core_scsi3_pr_reservation_check(). |
| 328 | */ |
| 329 | ignore_reg = (pr_reg_type & 0x80000000); |
| 330 | if (ignore_reg) |
| 331 | pr_reg_type &= ~0x80000000; |
| 332 | |
| 333 | switch (pr_reg_type) { |
| 334 | case PR_TYPE_WRITE_EXCLUSIVE: |
| 335 | we = 1; |
| 336 | case PR_TYPE_EXCLUSIVE_ACCESS: |
| 337 | /* |
| 338 | * Some commands are only allowed for the persistent reservation |
| 339 | * holder. |
| 340 | */ |
| 341 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
| 342 | registered_nexus = 1; |
| 343 | break; |
| 344 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
| 345 | we = 1; |
| 346 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
| 347 | /* |
| 348 | * Some commands are only allowed for registered I_T Nexuses. |
| 349 | */ |
| 350 | reg_only = 1; |
| 351 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
| 352 | registered_nexus = 1; |
| 353 | break; |
| 354 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
| 355 | we = 1; |
| 356 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
| 357 | /* |
| 358 | * Each registered I_T Nexus is a reservation holder. |
| 359 | */ |
| 360 | all_reg = 1; |
| 361 | if ((se_deve->def_pr_registered) && !(ignore_reg)) |
| 362 | registered_nexus = 1; |
| 363 | break; |
| 364 | default: |
| 365 | return -1; |
| 366 | } |
| 367 | /* |
| 368 | * Referenced from spc4r17 table 45 for *NON* PR holder access |
| 369 | */ |
| 370 | switch (cdb[0]) { |
| 371 | case SECURITY_PROTOCOL_IN: |
| 372 | if (registered_nexus) |
| 373 | return 0; |
| 374 | ret = (we) ? 0 : 1; |
| 375 | break; |
| 376 | case MODE_SENSE: |
| 377 | case MODE_SENSE_10: |
| 378 | case READ_ATTRIBUTE: |
| 379 | case READ_BUFFER: |
| 380 | case RECEIVE_DIAGNOSTIC: |
| 381 | if (legacy) { |
| 382 | ret = 1; |
| 383 | break; |
| 384 | } |
| 385 | if (registered_nexus) { |
| 386 | ret = 0; |
| 387 | break; |
| 388 | } |
| 389 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| 390 | break; |
| 391 | case PERSISTENT_RESERVE_OUT: |
| 392 | /* |
| 393 | * This follows PERSISTENT_RESERVE_OUT service actions that |
| 394 | * are allowed in the presence of various reservations. |
| 395 | * See spc4r17, table 46 |
| 396 | */ |
| 397 | switch (cdb[1] & 0x1f) { |
| 398 | case PRO_CLEAR: |
| 399 | case PRO_PREEMPT: |
| 400 | case PRO_PREEMPT_AND_ABORT: |
| 401 | ret = (registered_nexus) ? 0 : 1; |
| 402 | break; |
| 403 | case PRO_REGISTER: |
| 404 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: |
| 405 | ret = 0; |
| 406 | break; |
| 407 | case PRO_REGISTER_AND_MOVE: |
| 408 | case PRO_RESERVE: |
| 409 | ret = 1; |
| 410 | break; |
| 411 | case PRO_RELEASE: |
| 412 | ret = (registered_nexus) ? 0 : 1; |
| 413 | break; |
| 414 | default: |
| 415 | printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service" |
| 416 | " action: 0x%02x\n", cdb[1] & 0x1f); |
| 417 | return -1; |
| 418 | } |
| 419 | break; |
| 420 | case RELEASE: |
| 421 | case RELEASE_10: |
| 422 | /* Handled by CRH=1 in core_scsi2_emulate_crh() */ |
| 423 | ret = 0; |
| 424 | break; |
| 425 | case RESERVE: |
| 426 | case RESERVE_10: |
| 427 | /* Handled by CRH=1 in core_scsi2_emulate_crh() */ |
| 428 | ret = 0; |
| 429 | break; |
| 430 | case TEST_UNIT_READY: |
| 431 | ret = (legacy) ? 1 : 0; /* Conflict for legacy */ |
| 432 | break; |
| 433 | case MAINTENANCE_IN: |
| 434 | switch (cdb[1] & 0x1f) { |
| 435 | case MI_MANAGEMENT_PROTOCOL_IN: |
| 436 | if (registered_nexus) { |
| 437 | ret = 0; |
| 438 | break; |
| 439 | } |
| 440 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| 441 | break; |
| 442 | case MI_REPORT_SUPPORTED_OPERATION_CODES: |
| 443 | case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: |
| 444 | if (legacy) { |
| 445 | ret = 1; |
| 446 | break; |
| 447 | } |
| 448 | if (registered_nexus) { |
| 449 | ret = 0; |
| 450 | break; |
| 451 | } |
| 452 | ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| 453 | break; |
| 454 | case MI_REPORT_ALIASES: |
| 455 | case MI_REPORT_IDENTIFYING_INFORMATION: |
| 456 | case MI_REPORT_PRIORITY: |
| 457 | case MI_REPORT_TARGET_PGS: |
| 458 | case MI_REPORT_TIMESTAMP: |
| 459 | ret = 0; /* Allowed */ |
| 460 | break; |
| 461 | default: |
| 462 | printk(KERN_ERR "Unknown MI Service Action: 0x%02x\n", |
| 463 | (cdb[1] & 0x1f)); |
| 464 | return -1; |
| 465 | } |
| 466 | break; |
| 467 | case ACCESS_CONTROL_IN: |
| 468 | case ACCESS_CONTROL_OUT: |
| 469 | case INQUIRY: |
| 470 | case LOG_SENSE: |
| 471 | case READ_MEDIA_SERIAL_NUMBER: |
| 472 | case REPORT_LUNS: |
| 473 | case REQUEST_SENSE: |
| 474 | ret = 0; /*/ Allowed CDBs */ |
| 475 | break; |
| 476 | default: |
| 477 | other_cdb = 1; |
| 478 | break; |
| 479 | } |
| 480 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 481 | * Case where the CDB is explicitly allowed in the above switch |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 482 | * statement. |
| 483 | */ |
| 484 | if (!(ret) && !(other_cdb)) { |
| 485 | #if 0 |
| 486 | printk(KERN_INFO "Allowing explict CDB: 0x%02x for %s" |
| 487 | " reservation holder\n", cdb[0], |
| 488 | core_scsi3_pr_dump_type(pr_reg_type)); |
| 489 | #endif |
| 490 | return ret; |
| 491 | } |
| 492 | /* |
| 493 | * Check if write exclusive initiator ports *NOT* holding the |
| 494 | * WRITE_EXCLUSIVE_* reservation. |
| 495 | */ |
| 496 | if ((we) && !(registered_nexus)) { |
| 497 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 498 | /* |
| 499 | * Conflict for write exclusive |
| 500 | */ |
| 501 | printk(KERN_INFO "%s Conflict for unregistered nexus" |
| 502 | " %s CDB: 0x%02x to %s reservation\n", |
| 503 | transport_dump_cmd_direction(cmd), |
| 504 | se_sess->se_node_acl->initiatorname, cdb[0], |
| 505 | core_scsi3_pr_dump_type(pr_reg_type)); |
| 506 | return 1; |
| 507 | } else { |
| 508 | /* |
| 509 | * Allow non WRITE CDBs for all Write Exclusive |
| 510 | * PR TYPEs to pass for registered and |
| 511 | * non-registered_nexuxes NOT holding the reservation. |
| 512 | * |
| 513 | * We only make noise for the unregisterd nexuses, |
| 514 | * as we expect registered non-reservation holding |
| 515 | * nexuses to issue CDBs. |
| 516 | */ |
| 517 | #if 0 |
| 518 | if (!(registered_nexus)) { |
| 519 | printk(KERN_INFO "Allowing implict CDB: 0x%02x" |
| 520 | " for %s reservation on unregistered" |
| 521 | " nexus\n", cdb[0], |
| 522 | core_scsi3_pr_dump_type(pr_reg_type)); |
| 523 | } |
| 524 | #endif |
| 525 | return 0; |
| 526 | } |
| 527 | } else if ((reg_only) || (all_reg)) { |
| 528 | if (registered_nexus) { |
| 529 | /* |
| 530 | * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, |
| 531 | * allow commands from registered nexuses. |
| 532 | */ |
| 533 | #if 0 |
| 534 | printk(KERN_INFO "Allowing implict CDB: 0x%02x for %s" |
| 535 | " reservation\n", cdb[0], |
| 536 | core_scsi3_pr_dump_type(pr_reg_type)); |
| 537 | #endif |
| 538 | return 0; |
| 539 | } |
| 540 | } |
| 541 | printk(KERN_INFO "%s Conflict for %sregistered nexus %s CDB: 0x%2x" |
| 542 | " for %s reservation\n", transport_dump_cmd_direction(cmd), |
| 543 | (registered_nexus) ? "" : "un", |
| 544 | se_sess->se_node_acl->initiatorname, cdb[0], |
| 545 | core_scsi3_pr_dump_type(pr_reg_type)); |
| 546 | |
| 547 | return 1; /* Conflict by default */ |
| 548 | } |
| 549 | |
| 550 | static u32 core_scsi3_pr_generation(struct se_device *dev) |
| 551 | { |
| 552 | struct se_subsystem_dev *su_dev = SU_DEV(dev); |
| 553 | u32 prg; |
| 554 | /* |
| 555 | * PRGeneration field shall contain the value of a 32-bit wrapping |
| 556 | * counter mainted by the device server. |
| 557 | * |
| 558 | * Note that this is done regardless of Active Persist across |
| 559 | * Target PowerLoss (APTPL) |
| 560 | * |
| 561 | * See spc4r17 section 6.3.12 READ_KEYS service action |
| 562 | */ |
| 563 | spin_lock(&dev->dev_reservation_lock); |
| 564 | prg = T10_RES(su_dev)->pr_generation++; |
| 565 | spin_unlock(&dev->dev_reservation_lock); |
| 566 | |
| 567 | return prg; |
| 568 | } |
| 569 | |
| 570 | static int core_scsi3_pr_reservation_check( |
| 571 | struct se_cmd *cmd, |
| 572 | u32 *pr_reg_type) |
| 573 | { |
| 574 | struct se_device *dev = cmd->se_dev; |
| 575 | struct se_session *sess = cmd->se_sess; |
| 576 | int ret; |
| 577 | |
| 578 | if (!(sess)) |
| 579 | return 0; |
| 580 | /* |
| 581 | * A legacy SPC-2 reservation is being held. |
| 582 | */ |
| 583 | if (dev->dev_flags & DF_SPC2_RESERVATIONS) |
| 584 | return core_scsi2_reservation_check(cmd, pr_reg_type); |
| 585 | |
| 586 | spin_lock(&dev->dev_reservation_lock); |
| 587 | if (!(dev->dev_pr_res_holder)) { |
| 588 | spin_unlock(&dev->dev_reservation_lock); |
| 589 | return 0; |
| 590 | } |
| 591 | *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; |
| 592 | cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; |
| 593 | if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { |
| 594 | spin_unlock(&dev->dev_reservation_lock); |
| 595 | return -1; |
| 596 | } |
| 597 | if (!(dev->dev_pr_res_holder->isid_present_at_reg)) { |
| 598 | spin_unlock(&dev->dev_reservation_lock); |
| 599 | return 0; |
| 600 | } |
| 601 | ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == |
| 602 | sess->sess_bin_isid) ? 0 : -1; |
| 603 | /* |
| 604 | * Use bit in *pr_reg_type to notify ISID mismatch in |
| 605 | * core_scsi3_pr_seq_non_holder(). |
| 606 | */ |
| 607 | if (ret != 0) |
| 608 | *pr_reg_type |= 0x80000000; |
| 609 | spin_unlock(&dev->dev_reservation_lock); |
| 610 | |
| 611 | return ret; |
| 612 | } |
| 613 | |
| 614 | static struct t10_pr_registration *__core_scsi3_do_alloc_registration( |
| 615 | struct se_device *dev, |
| 616 | struct se_node_acl *nacl, |
| 617 | struct se_dev_entry *deve, |
| 618 | unsigned char *isid, |
| 619 | u64 sa_res_key, |
| 620 | int all_tg_pt, |
| 621 | int aptpl) |
| 622 | { |
| 623 | struct se_subsystem_dev *su_dev = SU_DEV(dev); |
| 624 | struct t10_pr_registration *pr_reg; |
| 625 | |
| 626 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); |
| 627 | if (!(pr_reg)) { |
| 628 | printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n"); |
| 629 | return NULL; |
| 630 | } |
| 631 | |
| 632 | pr_reg->pr_aptpl_buf = kzalloc(T10_RES(su_dev)->pr_aptpl_buf_len, |
| 633 | GFP_ATOMIC); |
| 634 | if (!(pr_reg->pr_aptpl_buf)) { |
| 635 | printk(KERN_ERR "Unable to allocate pr_reg->pr_aptpl_buf\n"); |
| 636 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
| 637 | return NULL; |
| 638 | } |
| 639 | |
| 640 | INIT_LIST_HEAD(&pr_reg->pr_reg_list); |
| 641 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); |
| 642 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); |
| 643 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); |
| 644 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); |
| 645 | atomic_set(&pr_reg->pr_res_holders, 0); |
| 646 | pr_reg->pr_reg_nacl = nacl; |
| 647 | pr_reg->pr_reg_deve = deve; |
| 648 | pr_reg->pr_res_mapped_lun = deve->mapped_lun; |
| 649 | pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; |
| 650 | pr_reg->pr_res_key = sa_res_key; |
| 651 | pr_reg->pr_reg_all_tg_pt = all_tg_pt; |
| 652 | pr_reg->pr_reg_aptpl = aptpl; |
| 653 | pr_reg->pr_reg_tg_pt_lun = deve->se_lun; |
| 654 | /* |
| 655 | * If an ISID value for this SCSI Initiator Port exists, |
| 656 | * save it to the registration now. |
| 657 | */ |
| 658 | if (isid != NULL) { |
| 659 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); |
| 660 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); |
| 661 | pr_reg->isid_present_at_reg = 1; |
| 662 | } |
| 663 | |
| 664 | return pr_reg; |
| 665 | } |
| 666 | |
| 667 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); |
| 668 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); |
| 669 | |
| 670 | /* |
| 671 | * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 |
| 672 | * modes. |
| 673 | */ |
| 674 | static struct t10_pr_registration *__core_scsi3_alloc_registration( |
| 675 | struct se_device *dev, |
| 676 | struct se_node_acl *nacl, |
| 677 | struct se_dev_entry *deve, |
| 678 | unsigned char *isid, |
| 679 | u64 sa_res_key, |
| 680 | int all_tg_pt, |
| 681 | int aptpl) |
| 682 | { |
| 683 | struct se_dev_entry *deve_tmp; |
| 684 | struct se_node_acl *nacl_tmp; |
| 685 | struct se_port *port, *port_tmp; |
| 686 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
| 687 | struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; |
| 688 | int ret; |
| 689 | /* |
| 690 | * Create a registration for the I_T Nexus upon which the |
| 691 | * PROUT REGISTER was received. |
| 692 | */ |
| 693 | pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, |
| 694 | sa_res_key, all_tg_pt, aptpl); |
| 695 | if (!(pr_reg)) |
| 696 | return NULL; |
| 697 | /* |
| 698 | * Return pointer to pr_reg for ALL_TG_PT=0 |
| 699 | */ |
| 700 | if (!(all_tg_pt)) |
| 701 | return pr_reg; |
| 702 | /* |
| 703 | * Create list of matching SCSI Initiator Port registrations |
| 704 | * for ALL_TG_PT=1 |
| 705 | */ |
| 706 | spin_lock(&dev->se_port_lock); |
| 707 | list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { |
| 708 | atomic_inc(&port->sep_tg_pt_ref_cnt); |
| 709 | smp_mb__after_atomic_inc(); |
| 710 | spin_unlock(&dev->se_port_lock); |
| 711 | |
| 712 | spin_lock_bh(&port->sep_alua_lock); |
| 713 | list_for_each_entry(deve_tmp, &port->sep_alua_list, |
| 714 | alua_port_list) { |
| 715 | /* |
| 716 | * This pointer will be NULL for demo mode MappedLUNs |
| 717 | * that have not been make explict via a ConfigFS |
| 718 | * MappedLUN group for the SCSI Initiator Node ACL. |
| 719 | */ |
| 720 | if (!(deve_tmp->se_lun_acl)) |
| 721 | continue; |
| 722 | |
| 723 | nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; |
| 724 | /* |
| 725 | * Skip the matching struct se_node_acl that is allocated |
| 726 | * above.. |
| 727 | */ |
| 728 | if (nacl == nacl_tmp) |
| 729 | continue; |
| 730 | /* |
| 731 | * Only perform PR registrations for target ports on |
| 732 | * the same fabric module as the REGISTER w/ ALL_TG_PT=1 |
| 733 | * arrived. |
| 734 | */ |
| 735 | if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) |
| 736 | continue; |
| 737 | /* |
| 738 | * Look for a matching Initiator Node ACL in ASCII format |
| 739 | */ |
| 740 | if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) |
| 741 | continue; |
| 742 | |
| 743 | atomic_inc(&deve_tmp->pr_ref_count); |
| 744 | smp_mb__after_atomic_inc(); |
| 745 | spin_unlock_bh(&port->sep_alua_lock); |
| 746 | /* |
| 747 | * Grab a configfs group dependency that is released |
| 748 | * for the exception path at label out: below, or upon |
| 749 | * completion of adding ALL_TG_PT=1 registrations in |
| 750 | * __core_scsi3_add_registration() |
| 751 | */ |
| 752 | ret = core_scsi3_lunacl_depend_item(deve_tmp); |
| 753 | if (ret < 0) { |
| 754 | printk(KERN_ERR "core_scsi3_lunacl_depend" |
| 755 | "_item() failed\n"); |
| 756 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
| 757 | smp_mb__after_atomic_dec(); |
| 758 | atomic_dec(&deve_tmp->pr_ref_count); |
| 759 | smp_mb__after_atomic_dec(); |
| 760 | goto out; |
| 761 | } |
| 762 | /* |
| 763 | * Located a matching SCSI Initiator Port on a different |
| 764 | * port, allocate the pr_reg_atp and attach it to the |
| 765 | * pr_reg->pr_reg_atp_list that will be processed once |
| 766 | * the original *pr_reg is processed in |
| 767 | * __core_scsi3_add_registration() |
| 768 | */ |
| 769 | pr_reg_atp = __core_scsi3_do_alloc_registration(dev, |
| 770 | nacl_tmp, deve_tmp, NULL, |
| 771 | sa_res_key, all_tg_pt, aptpl); |
| 772 | if (!(pr_reg_atp)) { |
| 773 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
| 774 | smp_mb__after_atomic_dec(); |
| 775 | atomic_dec(&deve_tmp->pr_ref_count); |
| 776 | smp_mb__after_atomic_dec(); |
| 777 | core_scsi3_lunacl_undepend_item(deve_tmp); |
| 778 | goto out; |
| 779 | } |
| 780 | |
| 781 | list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, |
| 782 | &pr_reg->pr_reg_atp_list); |
| 783 | spin_lock_bh(&port->sep_alua_lock); |
| 784 | } |
| 785 | spin_unlock_bh(&port->sep_alua_lock); |
| 786 | |
| 787 | spin_lock(&dev->se_port_lock); |
| 788 | atomic_dec(&port->sep_tg_pt_ref_cnt); |
| 789 | smp_mb__after_atomic_dec(); |
| 790 | } |
| 791 | spin_unlock(&dev->se_port_lock); |
| 792 | |
| 793 | return pr_reg; |
| 794 | out: |
| 795 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
| 796 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { |
| 797 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
| 798 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
| 799 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); |
| 800 | } |
| 801 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
| 802 | return NULL; |
| 803 | } |
| 804 | |
| 805 | int core_scsi3_alloc_aptpl_registration( |
| 806 | struct t10_reservation_template *pr_tmpl, |
| 807 | u64 sa_res_key, |
| 808 | unsigned char *i_port, |
| 809 | unsigned char *isid, |
| 810 | u32 mapped_lun, |
| 811 | unsigned char *t_port, |
| 812 | u16 tpgt, |
| 813 | u32 target_lun, |
| 814 | int res_holder, |
| 815 | int all_tg_pt, |
| 816 | u8 type) |
| 817 | { |
| 818 | struct t10_pr_registration *pr_reg; |
| 819 | |
| 820 | if (!(i_port) || !(t_port) || !(sa_res_key)) { |
| 821 | printk(KERN_ERR "Illegal parameters for APTPL registration\n"); |
| 822 | return -1; |
| 823 | } |
| 824 | |
| 825 | pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); |
| 826 | if (!(pr_reg)) { |
| 827 | printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n"); |
| 828 | return -1; |
| 829 | } |
| 830 | pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); |
| 831 | |
| 832 | INIT_LIST_HEAD(&pr_reg->pr_reg_list); |
| 833 | INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); |
| 834 | INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); |
| 835 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); |
| 836 | INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); |
| 837 | atomic_set(&pr_reg->pr_res_holders, 0); |
| 838 | pr_reg->pr_reg_nacl = NULL; |
| 839 | pr_reg->pr_reg_deve = NULL; |
| 840 | pr_reg->pr_res_mapped_lun = mapped_lun; |
| 841 | pr_reg->pr_aptpl_target_lun = target_lun; |
| 842 | pr_reg->pr_res_key = sa_res_key; |
| 843 | pr_reg->pr_reg_all_tg_pt = all_tg_pt; |
| 844 | pr_reg->pr_reg_aptpl = 1; |
| 845 | pr_reg->pr_reg_tg_pt_lun = NULL; |
| 846 | pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ |
| 847 | pr_reg->pr_res_type = type; |
| 848 | /* |
| 849 | * If an ISID value had been saved in APTPL metadata for this |
| 850 | * SCSI Initiator Port, restore it now. |
| 851 | */ |
| 852 | if (isid != NULL) { |
| 853 | pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); |
| 854 | snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); |
| 855 | pr_reg->isid_present_at_reg = 1; |
| 856 | } |
| 857 | /* |
| 858 | * Copy the i_port and t_port information from caller. |
| 859 | */ |
| 860 | snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); |
| 861 | snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); |
| 862 | pr_reg->pr_reg_tpgt = tpgt; |
| 863 | /* |
| 864 | * Set pr_res_holder from caller, the pr_reg who is the reservation |
| 865 | * holder will get it's pointer set in core_scsi3_aptpl_reserve() once |
| 866 | * the Initiator Node LUN ACL from the fabric module is created for |
| 867 | * this registration. |
| 868 | */ |
| 869 | pr_reg->pr_res_holder = res_holder; |
| 870 | |
| 871 | list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); |
| 872 | printk(KERN_INFO "SPC-3 PR APTPL Successfully added registration%s from" |
| 873 | " metadata\n", (res_holder) ? "+reservation" : ""); |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | static void core_scsi3_aptpl_reserve( |
| 878 | struct se_device *dev, |
| 879 | struct se_portal_group *tpg, |
| 880 | struct se_node_acl *node_acl, |
| 881 | struct t10_pr_registration *pr_reg) |
| 882 | { |
| 883 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 884 | int prf_isid; |
| 885 | |
| 886 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 887 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 888 | PR_REG_ISID_ID_LEN); |
| 889 | |
| 890 | spin_lock(&dev->dev_reservation_lock); |
| 891 | dev->dev_pr_res_holder = pr_reg; |
| 892 | spin_unlock(&dev->dev_reservation_lock); |
| 893 | |
| 894 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: APTPL RESERVE created" |
| 895 | " new reservation holder TYPE: %s ALL_TG_PT: %d\n", |
| 896 | TPG_TFO(tpg)->get_fabric_name(), |
| 897 | core_scsi3_pr_dump_type(pr_reg->pr_res_type), |
| 898 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
| 899 | printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n", |
| 900 | TPG_TFO(tpg)->get_fabric_name(), node_acl->initiatorname, |
| 901 | (prf_isid) ? &i_buf[0] : ""); |
| 902 | } |
| 903 | |
| 904 | static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, |
| 905 | struct t10_pr_registration *, int, int); |
| 906 | |
| 907 | static int __core_scsi3_check_aptpl_registration( |
| 908 | struct se_device *dev, |
| 909 | struct se_portal_group *tpg, |
| 910 | struct se_lun *lun, |
| 911 | u32 target_lun, |
| 912 | struct se_node_acl *nacl, |
| 913 | struct se_dev_entry *deve) |
| 914 | { |
| 915 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
| 916 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 917 | unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; |
| 918 | unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; |
| 919 | u16 tpgt; |
| 920 | |
| 921 | memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); |
| 922 | memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); |
| 923 | /* |
| 924 | * Copy Initiator Port information from struct se_node_acl |
| 925 | */ |
| 926 | snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); |
| 927 | snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", |
| 928 | TPG_TFO(tpg)->tpg_get_wwn(tpg)); |
| 929 | tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg); |
| 930 | /* |
| 931 | * Look for the matching registrations+reservation from those |
| 932 | * created from APTPL metadata. Note that multiple registrations |
| 933 | * may exist for fabrics that use ISIDs in their SCSI Initiator Port |
| 934 | * TransportIDs. |
| 935 | */ |
| 936 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
| 937 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, |
| 938 | pr_reg_aptpl_list) { |
| 939 | if (!(strcmp(pr_reg->pr_iport, i_port)) && |
| 940 | (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && |
| 941 | !(strcmp(pr_reg->pr_tport, t_port)) && |
| 942 | (pr_reg->pr_reg_tpgt == tpgt) && |
| 943 | (pr_reg->pr_aptpl_target_lun == target_lun)) { |
| 944 | |
| 945 | pr_reg->pr_reg_nacl = nacl; |
| 946 | pr_reg->pr_reg_deve = deve; |
| 947 | pr_reg->pr_reg_tg_pt_lun = lun; |
| 948 | |
| 949 | list_del(&pr_reg->pr_reg_aptpl_list); |
| 950 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
| 951 | /* |
| 952 | * At this point all of the pointers in *pr_reg will |
| 953 | * be setup, so go ahead and add the registration. |
| 954 | */ |
| 955 | |
| 956 | __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); |
| 957 | /* |
| 958 | * If this registration is the reservation holder, |
| 959 | * make that happen now.. |
| 960 | */ |
| 961 | if (pr_reg->pr_res_holder) |
| 962 | core_scsi3_aptpl_reserve(dev, tpg, |
| 963 | nacl, pr_reg); |
| 964 | /* |
| 965 | * Reenable pr_aptpl_active to accept new metadata |
| 966 | * updates once the SCSI device is active again.. |
| 967 | */ |
| 968 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
| 969 | pr_tmpl->pr_aptpl_active = 1; |
| 970 | } |
| 971 | } |
| 972 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
| 973 | |
| 974 | return 0; |
| 975 | } |
| 976 | |
| 977 | int core_scsi3_check_aptpl_registration( |
| 978 | struct se_device *dev, |
| 979 | struct se_portal_group *tpg, |
| 980 | struct se_lun *lun, |
| 981 | struct se_lun_acl *lun_acl) |
| 982 | { |
| 983 | struct se_subsystem_dev *su_dev = SU_DEV(dev); |
| 984 | struct se_node_acl *nacl = lun_acl->se_lun_nacl; |
| 985 | struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun]; |
| 986 | |
| 987 | if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS) |
| 988 | return 0; |
| 989 | |
| 990 | return __core_scsi3_check_aptpl_registration(dev, tpg, lun, |
| 991 | lun->unpacked_lun, nacl, deve); |
| 992 | } |
| 993 | |
| 994 | static void __core_scsi3_dump_registration( |
| 995 | struct target_core_fabric_ops *tfo, |
| 996 | struct se_device *dev, |
| 997 | struct se_node_acl *nacl, |
| 998 | struct t10_pr_registration *pr_reg, |
| 999 | int register_type) |
| 1000 | { |
| 1001 | struct se_portal_group *se_tpg = nacl->se_tpg; |
| 1002 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 1003 | int prf_isid; |
| 1004 | |
| 1005 | memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); |
| 1006 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 1007 | PR_REG_ISID_ID_LEN); |
| 1008 | |
| 1009 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER%s Initiator" |
| 1010 | " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? |
| 1011 | "_AND_MOVE" : (register_type == 1) ? |
| 1012 | "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, |
| 1013 | (prf_isid) ? i_buf : ""); |
| 1014 | printk(KERN_INFO "SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", |
| 1015 | tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), |
| 1016 | tfo->tpg_get_tag(se_tpg)); |
| 1017 | printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" |
| 1018 | " Port(s)\n", tfo->get_fabric_name(), |
| 1019 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", |
| 1020 | TRANSPORT(dev)->name); |
| 1021 | printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" |
| 1022 | " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), |
| 1023 | pr_reg->pr_res_key, pr_reg->pr_res_generation, |
| 1024 | pr_reg->pr_reg_aptpl); |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * this function can be called with struct se_device->dev_reservation_lock |
| 1029 | * when register_move = 1 |
| 1030 | */ |
| 1031 | static void __core_scsi3_add_registration( |
| 1032 | struct se_device *dev, |
| 1033 | struct se_node_acl *nacl, |
| 1034 | struct t10_pr_registration *pr_reg, |
| 1035 | int register_type, |
| 1036 | int register_move) |
| 1037 | { |
| 1038 | struct se_subsystem_dev *su_dev = SU_DEV(dev); |
| 1039 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
| 1040 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; |
| 1041 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 1042 | |
| 1043 | /* |
| 1044 | * Increment PRgeneration counter for struct se_device upon a successful |
| 1045 | * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action |
| 1046 | * |
| 1047 | * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service |
| 1048 | * action, the struct se_device->dev_reservation_lock will already be held, |
| 1049 | * so we do not call core_scsi3_pr_generation() which grabs the lock |
| 1050 | * for the REGISTER. |
| 1051 | */ |
| 1052 | pr_reg->pr_res_generation = (register_move) ? |
| 1053 | T10_RES(su_dev)->pr_generation++ : |
| 1054 | core_scsi3_pr_generation(dev); |
| 1055 | |
| 1056 | spin_lock(&pr_tmpl->registration_lock); |
| 1057 | list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); |
| 1058 | pr_reg->pr_reg_deve->def_pr_registered = 1; |
| 1059 | |
| 1060 | __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); |
| 1061 | spin_unlock(&pr_tmpl->registration_lock); |
| 1062 | /* |
| 1063 | * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. |
| 1064 | */ |
| 1065 | if (!(pr_reg->pr_reg_all_tg_pt) || (register_move)) |
| 1066 | return; |
| 1067 | /* |
| 1068 | * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 |
| 1069 | * allocated in __core_scsi3_alloc_registration() |
| 1070 | */ |
| 1071 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
| 1072 | &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { |
| 1073 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
| 1074 | |
| 1075 | pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); |
| 1076 | |
| 1077 | spin_lock(&pr_tmpl->registration_lock); |
| 1078 | list_add_tail(&pr_reg_tmp->pr_reg_list, |
| 1079 | &pr_tmpl->registration_list); |
| 1080 | pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; |
| 1081 | |
| 1082 | __core_scsi3_dump_registration(tfo, dev, |
| 1083 | pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, |
| 1084 | register_type); |
| 1085 | spin_unlock(&pr_tmpl->registration_lock); |
| 1086 | /* |
| 1087 | * Drop configfs group dependency reference from |
| 1088 | * __core_scsi3_alloc_registration() |
| 1089 | */ |
| 1090 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
| 1091 | } |
| 1092 | } |
| 1093 | |
| 1094 | static int core_scsi3_alloc_registration( |
| 1095 | struct se_device *dev, |
| 1096 | struct se_node_acl *nacl, |
| 1097 | struct se_dev_entry *deve, |
| 1098 | unsigned char *isid, |
| 1099 | u64 sa_res_key, |
| 1100 | int all_tg_pt, |
| 1101 | int aptpl, |
| 1102 | int register_type, |
| 1103 | int register_move) |
| 1104 | { |
| 1105 | struct t10_pr_registration *pr_reg; |
| 1106 | |
| 1107 | pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, |
| 1108 | sa_res_key, all_tg_pt, aptpl); |
| 1109 | if (!(pr_reg)) |
| 1110 | return -1; |
| 1111 | |
| 1112 | __core_scsi3_add_registration(dev, nacl, pr_reg, |
| 1113 | register_type, register_move); |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | static struct t10_pr_registration *__core_scsi3_locate_pr_reg( |
| 1118 | struct se_device *dev, |
| 1119 | struct se_node_acl *nacl, |
| 1120 | unsigned char *isid) |
| 1121 | { |
| 1122 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 1123 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
| 1124 | struct se_portal_group *tpg; |
| 1125 | |
| 1126 | spin_lock(&pr_tmpl->registration_lock); |
| 1127 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 1128 | &pr_tmpl->registration_list, pr_reg_list) { |
| 1129 | /* |
| 1130 | * First look for a matching struct se_node_acl |
| 1131 | */ |
| 1132 | if (pr_reg->pr_reg_nacl != nacl) |
| 1133 | continue; |
| 1134 | |
| 1135 | tpg = pr_reg->pr_reg_nacl->se_tpg; |
| 1136 | /* |
| 1137 | * If this registration does NOT contain a fabric provided |
| 1138 | * ISID, then we have found a match. |
| 1139 | */ |
| 1140 | if (!(pr_reg->isid_present_at_reg)) { |
| 1141 | /* |
| 1142 | * Determine if this SCSI device server requires that |
| 1143 | * SCSI Intiatior TransportID w/ ISIDs is enforced |
| 1144 | * for fabric modules (iSCSI) requiring them. |
| 1145 | */ |
| 1146 | if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) { |
| 1147 | if (DEV_ATTRIB(dev)->enforce_pr_isids) |
| 1148 | continue; |
| 1149 | } |
| 1150 | atomic_inc(&pr_reg->pr_res_holders); |
| 1151 | smp_mb__after_atomic_inc(); |
| 1152 | spin_unlock(&pr_tmpl->registration_lock); |
| 1153 | return pr_reg; |
| 1154 | } |
| 1155 | /* |
| 1156 | * If the *pr_reg contains a fabric defined ISID for multi-value |
| 1157 | * SCSI Initiator Port TransportIDs, then we expect a valid |
| 1158 | * matching ISID to be provided by the local SCSI Initiator Port. |
| 1159 | */ |
| 1160 | if (!(isid)) |
| 1161 | continue; |
| 1162 | if (strcmp(isid, pr_reg->pr_reg_isid)) |
| 1163 | continue; |
| 1164 | |
| 1165 | atomic_inc(&pr_reg->pr_res_holders); |
| 1166 | smp_mb__after_atomic_inc(); |
| 1167 | spin_unlock(&pr_tmpl->registration_lock); |
| 1168 | return pr_reg; |
| 1169 | } |
| 1170 | spin_unlock(&pr_tmpl->registration_lock); |
| 1171 | |
| 1172 | return NULL; |
| 1173 | } |
| 1174 | |
| 1175 | static struct t10_pr_registration *core_scsi3_locate_pr_reg( |
| 1176 | struct se_device *dev, |
| 1177 | struct se_node_acl *nacl, |
| 1178 | struct se_session *sess) |
| 1179 | { |
| 1180 | struct se_portal_group *tpg = nacl->se_tpg; |
| 1181 | unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; |
| 1182 | |
| 1183 | if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) { |
| 1184 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
| 1185 | TPG_TFO(tpg)->sess_get_initiator_sid(sess, &buf[0], |
| 1186 | PR_REG_ISID_LEN); |
| 1187 | isid_ptr = &buf[0]; |
| 1188 | } |
| 1189 | |
| 1190 | return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); |
| 1191 | } |
| 1192 | |
| 1193 | static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) |
| 1194 | { |
| 1195 | atomic_dec(&pr_reg->pr_res_holders); |
| 1196 | smp_mb__after_atomic_dec(); |
| 1197 | } |
| 1198 | |
| 1199 | static int core_scsi3_check_implict_release( |
| 1200 | struct se_device *dev, |
| 1201 | struct t10_pr_registration *pr_reg) |
| 1202 | { |
| 1203 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl; |
| 1204 | struct t10_pr_registration *pr_res_holder; |
| 1205 | int ret = 0; |
| 1206 | |
| 1207 | spin_lock(&dev->dev_reservation_lock); |
| 1208 | pr_res_holder = dev->dev_pr_res_holder; |
| 1209 | if (!(pr_res_holder)) { |
| 1210 | spin_unlock(&dev->dev_reservation_lock); |
| 1211 | return ret; |
| 1212 | } |
| 1213 | if (pr_res_holder == pr_reg) { |
| 1214 | /* |
| 1215 | * Perform an implict RELEASE if the registration that |
| 1216 | * is being released is holding the reservation. |
| 1217 | * |
| 1218 | * From spc4r17, section 5.7.11.1: |
| 1219 | * |
| 1220 | * e) If the I_T nexus is the persistent reservation holder |
| 1221 | * and the persistent reservation is not an all registrants |
| 1222 | * type, then a PERSISTENT RESERVE OUT command with REGISTER |
| 1223 | * service action or REGISTER AND IGNORE EXISTING KEY |
| 1224 | * service action with the SERVICE ACTION RESERVATION KEY |
| 1225 | * field set to zero (see 5.7.11.3). |
| 1226 | */ |
| 1227 | __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); |
| 1228 | ret = 1; |
| 1229 | /* |
| 1230 | * For 'All Registrants' reservation types, all existing |
| 1231 | * registrations are still processed as reservation holders |
| 1232 | * in core_scsi3_pr_seq_non_holder() after the initial |
| 1233 | * reservation holder is implictly released here. |
| 1234 | */ |
| 1235 | } else if (pr_reg->pr_reg_all_tg_pt && |
| 1236 | (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, |
| 1237 | pr_reg->pr_reg_nacl->initiatorname)) && |
| 1238 | (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { |
| 1239 | printk(KERN_ERR "SPC-3 PR: Unable to perform ALL_TG_PT=1" |
| 1240 | " UNREGISTER while existing reservation with matching" |
| 1241 | " key 0x%016Lx is present from another SCSI Initiator" |
| 1242 | " Port\n", pr_reg->pr_res_key); |
| 1243 | ret = -1; |
| 1244 | } |
| 1245 | spin_unlock(&dev->dev_reservation_lock); |
| 1246 | |
| 1247 | return ret; |
| 1248 | } |
| 1249 | |
| 1250 | /* |
| 1251 | * Called with struct t10_reservation_template->registration_lock held. |
| 1252 | */ |
| 1253 | static void __core_scsi3_free_registration( |
| 1254 | struct se_device *dev, |
| 1255 | struct t10_pr_registration *pr_reg, |
| 1256 | struct list_head *preempt_and_abort_list, |
| 1257 | int dec_holders) |
| 1258 | { |
| 1259 | struct target_core_fabric_ops *tfo = |
| 1260 | pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; |
| 1261 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 1262 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 1263 | int prf_isid; |
| 1264 | |
| 1265 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 1266 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 1267 | PR_REG_ISID_ID_LEN); |
| 1268 | |
| 1269 | pr_reg->pr_reg_deve->def_pr_registered = 0; |
| 1270 | pr_reg->pr_reg_deve->pr_res_key = 0; |
| 1271 | list_del(&pr_reg->pr_reg_list); |
| 1272 | /* |
| 1273 | * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), |
| 1274 | * so call core_scsi3_put_pr_reg() to decrement our reference. |
| 1275 | */ |
| 1276 | if (dec_holders) |
| 1277 | core_scsi3_put_pr_reg(pr_reg); |
| 1278 | /* |
| 1279 | * Wait until all reference from any other I_T nexuses for this |
| 1280 | * *pr_reg have been released. Because list_del() is called above, |
| 1281 | * the last core_scsi3_put_pr_reg(pr_reg) will release this reference |
| 1282 | * count back to zero, and we release *pr_reg. |
| 1283 | */ |
| 1284 | while (atomic_read(&pr_reg->pr_res_holders) != 0) { |
| 1285 | spin_unlock(&pr_tmpl->registration_lock); |
| 1286 | printk("SPC-3 PR [%s] waiting for pr_res_holders\n", |
| 1287 | tfo->get_fabric_name()); |
| 1288 | cpu_relax(); |
| 1289 | spin_lock(&pr_tmpl->registration_lock); |
| 1290 | } |
| 1291 | |
| 1292 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: UNREGISTER Initiator" |
| 1293 | " Node: %s%s\n", tfo->get_fabric_name(), |
| 1294 | pr_reg->pr_reg_nacl->initiatorname, |
| 1295 | (prf_isid) ? &i_buf[0] : ""); |
| 1296 | printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" |
| 1297 | " Port(s)\n", tfo->get_fabric_name(), |
| 1298 | (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", |
| 1299 | TRANSPORT(dev)->name); |
| 1300 | printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" |
| 1301 | " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, |
| 1302 | pr_reg->pr_res_generation); |
| 1303 | |
| 1304 | if (!(preempt_and_abort_list)) { |
| 1305 | pr_reg->pr_reg_deve = NULL; |
| 1306 | pr_reg->pr_reg_nacl = NULL; |
| 1307 | kfree(pr_reg->pr_aptpl_buf); |
| 1308 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
| 1309 | return; |
| 1310 | } |
| 1311 | /* |
| 1312 | * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list |
| 1313 | * are released once the ABORT_TASK_SET has completed.. |
| 1314 | */ |
| 1315 | list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); |
| 1316 | } |
| 1317 | |
| 1318 | void core_scsi3_free_pr_reg_from_nacl( |
| 1319 | struct se_device *dev, |
| 1320 | struct se_node_acl *nacl) |
| 1321 | { |
| 1322 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 1323 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; |
| 1324 | /* |
| 1325 | * If the passed se_node_acl matches the reservation holder, |
| 1326 | * release the reservation. |
| 1327 | */ |
| 1328 | spin_lock(&dev->dev_reservation_lock); |
| 1329 | pr_res_holder = dev->dev_pr_res_holder; |
| 1330 | if ((pr_res_holder != NULL) && |
| 1331 | (pr_res_holder->pr_reg_nacl == nacl)) |
| 1332 | __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); |
| 1333 | spin_unlock(&dev->dev_reservation_lock); |
| 1334 | /* |
| 1335 | * Release any registration associated with the struct se_node_acl. |
| 1336 | */ |
| 1337 | spin_lock(&pr_tmpl->registration_lock); |
| 1338 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 1339 | &pr_tmpl->registration_list, pr_reg_list) { |
| 1340 | |
| 1341 | if (pr_reg->pr_reg_nacl != nacl) |
| 1342 | continue; |
| 1343 | |
| 1344 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0); |
| 1345 | } |
| 1346 | spin_unlock(&pr_tmpl->registration_lock); |
| 1347 | } |
| 1348 | |
| 1349 | void core_scsi3_free_all_registrations( |
| 1350 | struct se_device *dev) |
| 1351 | { |
| 1352 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 1353 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; |
| 1354 | |
| 1355 | spin_lock(&dev->dev_reservation_lock); |
| 1356 | pr_res_holder = dev->dev_pr_res_holder; |
| 1357 | if (pr_res_holder != NULL) { |
| 1358 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 1359 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
| 1360 | pr_res_holder, 0); |
| 1361 | } |
| 1362 | spin_unlock(&dev->dev_reservation_lock); |
| 1363 | |
| 1364 | spin_lock(&pr_tmpl->registration_lock); |
| 1365 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 1366 | &pr_tmpl->registration_list, pr_reg_list) { |
| 1367 | |
| 1368 | __core_scsi3_free_registration(dev, pr_reg, NULL, 0); |
| 1369 | } |
| 1370 | spin_unlock(&pr_tmpl->registration_lock); |
| 1371 | |
| 1372 | spin_lock(&pr_tmpl->aptpl_reg_lock); |
| 1373 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, |
| 1374 | pr_reg_aptpl_list) { |
| 1375 | list_del(&pr_reg->pr_reg_aptpl_list); |
| 1376 | kfree(pr_reg->pr_aptpl_buf); |
| 1377 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
| 1378 | } |
| 1379 | spin_unlock(&pr_tmpl->aptpl_reg_lock); |
| 1380 | } |
| 1381 | |
| 1382 | static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) |
| 1383 | { |
| 1384 | return configfs_depend_item(TPG_TFO(tpg)->tf_subsys, |
| 1385 | &tpg->tpg_group.cg_item); |
| 1386 | } |
| 1387 | |
| 1388 | static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) |
| 1389 | { |
| 1390 | configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, |
| 1391 | &tpg->tpg_group.cg_item); |
| 1392 | |
| 1393 | atomic_dec(&tpg->tpg_pr_ref_count); |
| 1394 | smp_mb__after_atomic_dec(); |
| 1395 | } |
| 1396 | |
| 1397 | static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) |
| 1398 | { |
| 1399 | struct se_portal_group *tpg = nacl->se_tpg; |
| 1400 | |
| 1401 | if (nacl->dynamic_node_acl) |
| 1402 | return 0; |
| 1403 | |
| 1404 | return configfs_depend_item(TPG_TFO(tpg)->tf_subsys, |
| 1405 | &nacl->acl_group.cg_item); |
| 1406 | } |
| 1407 | |
| 1408 | static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) |
| 1409 | { |
| 1410 | struct se_portal_group *tpg = nacl->se_tpg; |
| 1411 | |
| 1412 | if (nacl->dynamic_node_acl) { |
| 1413 | atomic_dec(&nacl->acl_pr_ref_count); |
| 1414 | smp_mb__after_atomic_dec(); |
| 1415 | return; |
| 1416 | } |
| 1417 | |
| 1418 | configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, |
| 1419 | &nacl->acl_group.cg_item); |
| 1420 | |
| 1421 | atomic_dec(&nacl->acl_pr_ref_count); |
| 1422 | smp_mb__after_atomic_dec(); |
| 1423 | } |
| 1424 | |
| 1425 | static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) |
| 1426 | { |
| 1427 | struct se_lun_acl *lun_acl = se_deve->se_lun_acl; |
| 1428 | struct se_node_acl *nacl; |
| 1429 | struct se_portal_group *tpg; |
| 1430 | /* |
| 1431 | * For nacl->dynamic_node_acl=1 |
| 1432 | */ |
| 1433 | if (!(lun_acl)) |
| 1434 | return 0; |
| 1435 | |
| 1436 | nacl = lun_acl->se_lun_nacl; |
| 1437 | tpg = nacl->se_tpg; |
| 1438 | |
| 1439 | return configfs_depend_item(TPG_TFO(tpg)->tf_subsys, |
| 1440 | &lun_acl->se_lun_group.cg_item); |
| 1441 | } |
| 1442 | |
| 1443 | static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) |
| 1444 | { |
| 1445 | struct se_lun_acl *lun_acl = se_deve->se_lun_acl; |
| 1446 | struct se_node_acl *nacl; |
| 1447 | struct se_portal_group *tpg; |
| 1448 | /* |
| 1449 | * For nacl->dynamic_node_acl=1 |
| 1450 | */ |
| 1451 | if (!(lun_acl)) { |
| 1452 | atomic_dec(&se_deve->pr_ref_count); |
| 1453 | smp_mb__after_atomic_dec(); |
| 1454 | return; |
| 1455 | } |
| 1456 | nacl = lun_acl->se_lun_nacl; |
| 1457 | tpg = nacl->se_tpg; |
| 1458 | |
| 1459 | configfs_undepend_item(TPG_TFO(tpg)->tf_subsys, |
| 1460 | &lun_acl->se_lun_group.cg_item); |
| 1461 | |
| 1462 | atomic_dec(&se_deve->pr_ref_count); |
| 1463 | smp_mb__after_atomic_dec(); |
| 1464 | } |
| 1465 | |
| 1466 | static int core_scsi3_decode_spec_i_port( |
| 1467 | struct se_cmd *cmd, |
| 1468 | struct se_portal_group *tpg, |
| 1469 | unsigned char *l_isid, |
| 1470 | u64 sa_res_key, |
| 1471 | int all_tg_pt, |
| 1472 | int aptpl) |
| 1473 | { |
| 1474 | struct se_device *dev = SE_DEV(cmd); |
| 1475 | struct se_port *tmp_port; |
| 1476 | struct se_portal_group *dest_tpg = NULL, *tmp_tpg; |
| 1477 | struct se_session *se_sess = SE_SESS(cmd); |
| 1478 | struct se_node_acl *dest_node_acl = NULL; |
| 1479 | struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; |
| 1480 | struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; |
| 1481 | struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; |
| 1482 | struct list_head tid_dest_list; |
| 1483 | struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; |
| 1484 | struct target_core_fabric_ops *tmp_tf_ops; |
| 1485 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 1486 | unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; |
| 1487 | char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; |
| 1488 | u32 tpdl, tid_len = 0; |
| 1489 | int ret, dest_local_nexus, prf_isid; |
| 1490 | u32 dest_rtpi = 0; |
| 1491 | |
| 1492 | memset(dest_iport, 0, 64); |
| 1493 | INIT_LIST_HEAD(&tid_dest_list); |
| 1494 | |
| 1495 | local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 1496 | /* |
| 1497 | * Allocate a struct pr_transport_id_holder and setup the |
| 1498 | * local_node_acl and local_se_deve pointers and add to |
| 1499 | * struct list_head tid_dest_list for add registration |
| 1500 | * processing in the loop of tid_dest_list below. |
| 1501 | */ |
| 1502 | tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); |
| 1503 | if (!(tidh_new)) { |
| 1504 | printk(KERN_ERR "Unable to allocate tidh_new\n"); |
| 1505 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1506 | } |
| 1507 | INIT_LIST_HEAD(&tidh_new->dest_list); |
| 1508 | tidh_new->dest_tpg = tpg; |
| 1509 | tidh_new->dest_node_acl = se_sess->se_node_acl; |
| 1510 | tidh_new->dest_se_deve = local_se_deve; |
| 1511 | |
| 1512 | local_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd), |
| 1513 | se_sess->se_node_acl, local_se_deve, l_isid, |
| 1514 | sa_res_key, all_tg_pt, aptpl); |
| 1515 | if (!(local_pr_reg)) { |
| 1516 | kfree(tidh_new); |
| 1517 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1518 | } |
| 1519 | tidh_new->dest_pr_reg = local_pr_reg; |
| 1520 | /* |
| 1521 | * The local I_T nexus does not hold any configfs dependances, |
| 1522 | * so we set tid_h->dest_local_nexus=1 to prevent the |
| 1523 | * configfs_undepend_item() calls in the tid_dest_list loops below. |
| 1524 | */ |
| 1525 | tidh_new->dest_local_nexus = 1; |
| 1526 | list_add_tail(&tidh_new->dest_list, &tid_dest_list); |
| 1527 | /* |
| 1528 | * For a PERSISTENT RESERVE OUT specify initiator ports payload, |
| 1529 | * first extract TransportID Parameter Data Length, and make sure |
| 1530 | * the value matches up to the SCSI expected data transfer length. |
| 1531 | */ |
| 1532 | tpdl = (buf[24] & 0xff) << 24; |
| 1533 | tpdl |= (buf[25] & 0xff) << 16; |
| 1534 | tpdl |= (buf[26] & 0xff) << 8; |
| 1535 | tpdl |= buf[27] & 0xff; |
| 1536 | |
| 1537 | if ((tpdl + 28) != cmd->data_length) { |
| 1538 | printk(KERN_ERR "SPC-3 PR: Illegal tpdl: %u + 28 byte header" |
| 1539 | " does not equal CDB data_length: %u\n", tpdl, |
| 1540 | cmd->data_length); |
| 1541 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 1542 | goto out; |
| 1543 | } |
| 1544 | /* |
| 1545 | * Start processing the received transport IDs using the |
| 1546 | * receiving I_T Nexus portal's fabric dependent methods to |
| 1547 | * obtain the SCSI Initiator Port/Device Identifiers. |
| 1548 | */ |
| 1549 | ptr = &buf[28]; |
| 1550 | |
| 1551 | while (tpdl > 0) { |
| 1552 | proto_ident = (ptr[0] & 0x0f); |
| 1553 | dest_tpg = NULL; |
| 1554 | |
| 1555 | spin_lock(&dev->se_port_lock); |
| 1556 | list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { |
| 1557 | tmp_tpg = tmp_port->sep_tpg; |
| 1558 | if (!(tmp_tpg)) |
| 1559 | continue; |
| 1560 | tmp_tf_ops = TPG_TFO(tmp_tpg); |
| 1561 | if (!(tmp_tf_ops)) |
| 1562 | continue; |
| 1563 | if (!(tmp_tf_ops->get_fabric_proto_ident) || |
| 1564 | !(tmp_tf_ops->tpg_parse_pr_out_transport_id)) |
| 1565 | continue; |
| 1566 | /* |
| 1567 | * Look for the matching proto_ident provided by |
| 1568 | * the received TransportID |
| 1569 | */ |
| 1570 | tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); |
| 1571 | if (tmp_proto_ident != proto_ident) |
| 1572 | continue; |
| 1573 | dest_rtpi = tmp_port->sep_rtpi; |
| 1574 | |
| 1575 | i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( |
| 1576 | tmp_tpg, (const char *)ptr, &tid_len, |
| 1577 | &iport_ptr); |
| 1578 | if (!(i_str)) |
| 1579 | continue; |
| 1580 | |
| 1581 | atomic_inc(&tmp_tpg->tpg_pr_ref_count); |
| 1582 | smp_mb__after_atomic_inc(); |
| 1583 | spin_unlock(&dev->se_port_lock); |
| 1584 | |
| 1585 | ret = core_scsi3_tpg_depend_item(tmp_tpg); |
| 1586 | if (ret != 0) { |
| 1587 | printk(KERN_ERR " core_scsi3_tpg_depend_item()" |
| 1588 | " for tmp_tpg\n"); |
| 1589 | atomic_dec(&tmp_tpg->tpg_pr_ref_count); |
| 1590 | smp_mb__after_atomic_dec(); |
| 1591 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1592 | goto out; |
| 1593 | } |
| 1594 | /* |
| 1595 | * Locate the desination initiator ACL to be registered |
| 1596 | * from the decoded fabric module specific TransportID |
| 1597 | * at *i_str. |
| 1598 | */ |
| 1599 | spin_lock_bh(&tmp_tpg->acl_node_lock); |
| 1600 | dest_node_acl = __core_tpg_get_initiator_node_acl( |
| 1601 | tmp_tpg, i_str); |
| 1602 | if (dest_node_acl) { |
| 1603 | atomic_inc(&dest_node_acl->acl_pr_ref_count); |
| 1604 | smp_mb__after_atomic_inc(); |
| 1605 | } |
| 1606 | spin_unlock_bh(&tmp_tpg->acl_node_lock); |
| 1607 | |
| 1608 | if (!(dest_node_acl)) { |
| 1609 | core_scsi3_tpg_undepend_item(tmp_tpg); |
| 1610 | spin_lock(&dev->se_port_lock); |
| 1611 | continue; |
| 1612 | } |
| 1613 | |
| 1614 | ret = core_scsi3_nodeacl_depend_item(dest_node_acl); |
| 1615 | if (ret != 0) { |
| 1616 | printk(KERN_ERR "configfs_depend_item() failed" |
| 1617 | " for dest_node_acl->acl_group\n"); |
| 1618 | atomic_dec(&dest_node_acl->acl_pr_ref_count); |
| 1619 | smp_mb__after_atomic_dec(); |
| 1620 | core_scsi3_tpg_undepend_item(tmp_tpg); |
| 1621 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1622 | goto out; |
| 1623 | } |
| 1624 | |
| 1625 | dest_tpg = tmp_tpg; |
| 1626 | printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node:" |
| 1627 | " %s Port RTPI: %hu\n", |
| 1628 | TPG_TFO(dest_tpg)->get_fabric_name(), |
| 1629 | dest_node_acl->initiatorname, dest_rtpi); |
| 1630 | |
| 1631 | spin_lock(&dev->se_port_lock); |
| 1632 | break; |
| 1633 | } |
| 1634 | spin_unlock(&dev->se_port_lock); |
| 1635 | |
| 1636 | if (!(dest_tpg)) { |
| 1637 | printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Unable to locate" |
| 1638 | " dest_tpg\n"); |
| 1639 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 1640 | goto out; |
| 1641 | } |
| 1642 | #if 0 |
| 1643 | printk("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" |
| 1644 | " tid_len: %d for %s + %s\n", |
| 1645 | TPG_TFO(dest_tpg)->get_fabric_name(), cmd->data_length, |
| 1646 | tpdl, tid_len, i_str, iport_ptr); |
| 1647 | #endif |
| 1648 | if (tid_len > tpdl) { |
| 1649 | printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Illegal tid_len:" |
| 1650 | " %u for Transport ID: %s\n", tid_len, ptr); |
| 1651 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1652 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1653 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 1654 | goto out; |
| 1655 | } |
| 1656 | /* |
| 1657 | * Locate the desintation struct se_dev_entry pointer for matching |
| 1658 | * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus |
| 1659 | * Target Port. |
| 1660 | */ |
| 1661 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, |
| 1662 | dest_rtpi); |
| 1663 | if (!(dest_se_deve)) { |
| 1664 | printk(KERN_ERR "Unable to locate %s dest_se_deve" |
| 1665 | " from destination RTPI: %hu\n", |
| 1666 | TPG_TFO(dest_tpg)->get_fabric_name(), |
| 1667 | dest_rtpi); |
| 1668 | |
| 1669 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1670 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1671 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 1672 | goto out; |
| 1673 | } |
| 1674 | |
| 1675 | ret = core_scsi3_lunacl_depend_item(dest_se_deve); |
| 1676 | if (ret < 0) { |
| 1677 | printk(KERN_ERR "core_scsi3_lunacl_depend_item()" |
| 1678 | " failed\n"); |
| 1679 | atomic_dec(&dest_se_deve->pr_ref_count); |
| 1680 | smp_mb__after_atomic_dec(); |
| 1681 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1682 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1683 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1684 | goto out; |
| 1685 | } |
| 1686 | #if 0 |
| 1687 | printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node: %s" |
| 1688 | " dest_se_deve mapped_lun: %u\n", |
| 1689 | TPG_TFO(dest_tpg)->get_fabric_name(), |
| 1690 | dest_node_acl->initiatorname, dest_se_deve->mapped_lun); |
| 1691 | #endif |
| 1692 | /* |
| 1693 | * Skip any TransportIDs that already have a registration for |
| 1694 | * this target port. |
| 1695 | */ |
| 1696 | pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
| 1697 | iport_ptr); |
| 1698 | if (pr_reg_e) { |
| 1699 | core_scsi3_put_pr_reg(pr_reg_e); |
| 1700 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 1701 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1702 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1703 | ptr += tid_len; |
| 1704 | tpdl -= tid_len; |
| 1705 | tid_len = 0; |
| 1706 | continue; |
| 1707 | } |
| 1708 | /* |
| 1709 | * Allocate a struct pr_transport_id_holder and setup |
| 1710 | * the dest_node_acl and dest_se_deve pointers for the |
| 1711 | * loop below. |
| 1712 | */ |
| 1713 | tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), |
| 1714 | GFP_KERNEL); |
| 1715 | if (!(tidh_new)) { |
| 1716 | printk(KERN_ERR "Unable to allocate tidh_new\n"); |
| 1717 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 1718 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1719 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1720 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 1721 | goto out; |
| 1722 | } |
| 1723 | INIT_LIST_HEAD(&tidh_new->dest_list); |
| 1724 | tidh_new->dest_tpg = dest_tpg; |
| 1725 | tidh_new->dest_node_acl = dest_node_acl; |
| 1726 | tidh_new->dest_se_deve = dest_se_deve; |
| 1727 | |
| 1728 | /* |
| 1729 | * Allocate, but do NOT add the registration for the |
| 1730 | * TransportID referenced SCSI Initiator port. This |
| 1731 | * done because of the following from spc4r17 in section |
| 1732 | * 6.14.3 wrt SPEC_I_PT: |
| 1733 | * |
| 1734 | * "If a registration fails for any initiator port (e.g., if th |
| 1735 | * logical unit does not have enough resources available to |
| 1736 | * hold the registration information), no registrations shall be |
| 1737 | * made, and the command shall be terminated with |
| 1738 | * CHECK CONDITION status." |
| 1739 | * |
| 1740 | * That means we call __core_scsi3_alloc_registration() here, |
| 1741 | * and then call __core_scsi3_add_registration() in the |
| 1742 | * 2nd loop which will never fail. |
| 1743 | */ |
| 1744 | dest_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd), |
| 1745 | dest_node_acl, dest_se_deve, iport_ptr, |
| 1746 | sa_res_key, all_tg_pt, aptpl); |
| 1747 | if (!(dest_pr_reg)) { |
| 1748 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 1749 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1750 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1751 | kfree(tidh_new); |
| 1752 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 1753 | goto out; |
| 1754 | } |
| 1755 | tidh_new->dest_pr_reg = dest_pr_reg; |
| 1756 | list_add_tail(&tidh_new->dest_list, &tid_dest_list); |
| 1757 | |
| 1758 | ptr += tid_len; |
| 1759 | tpdl -= tid_len; |
| 1760 | tid_len = 0; |
| 1761 | |
| 1762 | } |
| 1763 | /* |
| 1764 | * Go ahead and create a registrations from tid_dest_list for the |
| 1765 | * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl |
| 1766 | * and dest_se_deve. |
| 1767 | * |
| 1768 | * The SA Reservation Key from the PROUT is set for the |
| 1769 | * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 |
| 1770 | * means that the TransportID Initiator port will be |
| 1771 | * registered on all of the target ports in the SCSI target device |
| 1772 | * ALL_TG_PT=0 means the registration will only be for the |
| 1773 | * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 |
| 1774 | * was received. |
| 1775 | */ |
| 1776 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { |
| 1777 | dest_tpg = tidh->dest_tpg; |
| 1778 | dest_node_acl = tidh->dest_node_acl; |
| 1779 | dest_se_deve = tidh->dest_se_deve; |
| 1780 | dest_pr_reg = tidh->dest_pr_reg; |
| 1781 | dest_local_nexus = tidh->dest_local_nexus; |
| 1782 | |
| 1783 | list_del(&tidh->dest_list); |
| 1784 | kfree(tidh); |
| 1785 | |
| 1786 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 1787 | prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], |
| 1788 | PR_REG_ISID_ID_LEN); |
| 1789 | |
| 1790 | __core_scsi3_add_registration(SE_DEV(cmd), dest_node_acl, |
| 1791 | dest_pr_reg, 0, 0); |
| 1792 | |
| 1793 | printk(KERN_INFO "SPC-3 PR [%s] SPEC_I_PT: Successfully" |
| 1794 | " registered Transport ID for Node: %s%s Mapped LUN:" |
| 1795 | " %u\n", TPG_TFO(dest_tpg)->get_fabric_name(), |
| 1796 | dest_node_acl->initiatorname, (prf_isid) ? |
| 1797 | &i_buf[0] : "", dest_se_deve->mapped_lun); |
| 1798 | |
| 1799 | if (dest_local_nexus) |
| 1800 | continue; |
| 1801 | |
| 1802 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 1803 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1804 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1805 | } |
| 1806 | |
| 1807 | return 0; |
| 1808 | out: |
| 1809 | /* |
| 1810 | * For the failure case, release everything from tid_dest_list |
| 1811 | * including *dest_pr_reg and the configfs dependances.. |
| 1812 | */ |
| 1813 | list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { |
| 1814 | dest_tpg = tidh->dest_tpg; |
| 1815 | dest_node_acl = tidh->dest_node_acl; |
| 1816 | dest_se_deve = tidh->dest_se_deve; |
| 1817 | dest_pr_reg = tidh->dest_pr_reg; |
| 1818 | dest_local_nexus = tidh->dest_local_nexus; |
| 1819 | |
| 1820 | list_del(&tidh->dest_list); |
| 1821 | kfree(tidh); |
| 1822 | /* |
| 1823 | * Release any extra ALL_TG_PT=1 registrations for |
| 1824 | * the SPEC_I_PT=1 case. |
| 1825 | */ |
| 1826 | list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, |
| 1827 | &dest_pr_reg->pr_reg_atp_list, |
| 1828 | pr_reg_atp_mem_list) { |
| 1829 | list_del(&pr_reg_tmp->pr_reg_atp_mem_list); |
| 1830 | core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); |
| 1831 | kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); |
| 1832 | } |
| 1833 | |
| 1834 | kfree(dest_pr_reg->pr_aptpl_buf); |
| 1835 | kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); |
| 1836 | |
| 1837 | if (dest_local_nexus) |
| 1838 | continue; |
| 1839 | |
| 1840 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 1841 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 1842 | core_scsi3_tpg_undepend_item(dest_tpg); |
| 1843 | } |
| 1844 | return ret; |
| 1845 | } |
| 1846 | |
| 1847 | /* |
| 1848 | * Called with struct se_device->dev_reservation_lock held |
| 1849 | */ |
| 1850 | static int __core_scsi3_update_aptpl_buf( |
| 1851 | struct se_device *dev, |
| 1852 | unsigned char *buf, |
| 1853 | u32 pr_aptpl_buf_len, |
| 1854 | int clear_aptpl_metadata) |
| 1855 | { |
| 1856 | struct se_lun *lun; |
| 1857 | struct se_portal_group *tpg; |
| 1858 | struct se_subsystem_dev *su_dev = SU_DEV(dev); |
| 1859 | struct t10_pr_registration *pr_reg; |
| 1860 | unsigned char tmp[512], isid_buf[32]; |
| 1861 | ssize_t len = 0; |
| 1862 | int reg_count = 0; |
| 1863 | |
| 1864 | memset(buf, 0, pr_aptpl_buf_len); |
| 1865 | /* |
| 1866 | * Called to clear metadata once APTPL has been deactivated. |
| 1867 | */ |
| 1868 | if (clear_aptpl_metadata) { |
| 1869 | snprintf(buf, pr_aptpl_buf_len, |
| 1870 | "No Registrations or Reservations\n"); |
| 1871 | return 0; |
| 1872 | } |
| 1873 | /* |
| 1874 | * Walk the registration list.. |
| 1875 | */ |
| 1876 | spin_lock(&T10_RES(su_dev)->registration_lock); |
| 1877 | list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list, |
| 1878 | pr_reg_list) { |
| 1879 | |
| 1880 | tmp[0] = '\0'; |
| 1881 | isid_buf[0] = '\0'; |
| 1882 | tpg = pr_reg->pr_reg_nacl->se_tpg; |
| 1883 | lun = pr_reg->pr_reg_tg_pt_lun; |
| 1884 | /* |
| 1885 | * Write out any ISID value to APTPL metadata that was included |
| 1886 | * in the original registration. |
| 1887 | */ |
| 1888 | if (pr_reg->isid_present_at_reg) |
| 1889 | snprintf(isid_buf, 32, "initiator_sid=%s\n", |
| 1890 | pr_reg->pr_reg_isid); |
| 1891 | /* |
| 1892 | * Include special metadata if the pr_reg matches the |
| 1893 | * reservation holder. |
| 1894 | */ |
| 1895 | if (dev->dev_pr_res_holder == pr_reg) { |
| 1896 | snprintf(tmp, 512, "PR_REG_START: %d" |
| 1897 | "\ninitiator_fabric=%s\n" |
| 1898 | "initiator_node=%s\n%s" |
| 1899 | "sa_res_key=%llu\n" |
| 1900 | "res_holder=1\nres_type=%02x\n" |
| 1901 | "res_scope=%02x\nres_all_tg_pt=%d\n" |
| 1902 | "mapped_lun=%u\n", reg_count, |
| 1903 | TPG_TFO(tpg)->get_fabric_name(), |
| 1904 | pr_reg->pr_reg_nacl->initiatorname, isid_buf, |
| 1905 | pr_reg->pr_res_key, pr_reg->pr_res_type, |
| 1906 | pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, |
| 1907 | pr_reg->pr_res_mapped_lun); |
| 1908 | } else { |
| 1909 | snprintf(tmp, 512, "PR_REG_START: %d\n" |
| 1910 | "initiator_fabric=%s\ninitiator_node=%s\n%s" |
| 1911 | "sa_res_key=%llu\nres_holder=0\n" |
| 1912 | "res_all_tg_pt=%d\nmapped_lun=%u\n", |
| 1913 | reg_count, TPG_TFO(tpg)->get_fabric_name(), |
| 1914 | pr_reg->pr_reg_nacl->initiatorname, isid_buf, |
| 1915 | pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, |
| 1916 | pr_reg->pr_res_mapped_lun); |
| 1917 | } |
| 1918 | |
Dan Carpenter | 60d645a | 2011-06-15 10:03:05 -0700 | [diff] [blame] | 1919 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1920 | printk(KERN_ERR "Unable to update renaming" |
| 1921 | " APTPL metadata\n"); |
| 1922 | spin_unlock(&T10_RES(su_dev)->registration_lock); |
| 1923 | return -1; |
| 1924 | } |
| 1925 | len += sprintf(buf+len, "%s", tmp); |
| 1926 | |
| 1927 | /* |
| 1928 | * Include information about the associated SCSI target port. |
| 1929 | */ |
| 1930 | snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" |
| 1931 | "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" |
| 1932 | " %d\n", TPG_TFO(tpg)->get_fabric_name(), |
| 1933 | TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| 1934 | TPG_TFO(tpg)->tpg_get_tag(tpg), |
| 1935 | lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); |
| 1936 | |
Dan Carpenter | 60d645a | 2011-06-15 10:03:05 -0700 | [diff] [blame] | 1937 | if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1938 | printk(KERN_ERR "Unable to update renaming" |
| 1939 | " APTPL metadata\n"); |
| 1940 | spin_unlock(&T10_RES(su_dev)->registration_lock); |
| 1941 | return -1; |
| 1942 | } |
| 1943 | len += sprintf(buf+len, "%s", tmp); |
| 1944 | reg_count++; |
| 1945 | } |
| 1946 | spin_unlock(&T10_RES(su_dev)->registration_lock); |
| 1947 | |
| 1948 | if (!(reg_count)) |
| 1949 | len += sprintf(buf+len, "No Registrations or Reservations"); |
| 1950 | |
| 1951 | return 0; |
| 1952 | } |
| 1953 | |
| 1954 | static int core_scsi3_update_aptpl_buf( |
| 1955 | struct se_device *dev, |
| 1956 | unsigned char *buf, |
| 1957 | u32 pr_aptpl_buf_len, |
| 1958 | int clear_aptpl_metadata) |
| 1959 | { |
| 1960 | int ret; |
| 1961 | |
| 1962 | spin_lock(&dev->dev_reservation_lock); |
| 1963 | ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, |
| 1964 | clear_aptpl_metadata); |
| 1965 | spin_unlock(&dev->dev_reservation_lock); |
| 1966 | |
| 1967 | return ret; |
| 1968 | } |
| 1969 | |
| 1970 | /* |
| 1971 | * Called with struct se_device->aptpl_file_mutex held |
| 1972 | */ |
| 1973 | static int __core_scsi3_write_aptpl_to_file( |
| 1974 | struct se_device *dev, |
| 1975 | unsigned char *buf, |
| 1976 | u32 pr_aptpl_buf_len) |
| 1977 | { |
| 1978 | struct t10_wwn *wwn = &SU_DEV(dev)->t10_wwn; |
| 1979 | struct file *file; |
| 1980 | struct iovec iov[1]; |
| 1981 | mm_segment_t old_fs; |
| 1982 | int flags = O_RDWR | O_CREAT | O_TRUNC; |
| 1983 | char path[512]; |
| 1984 | int ret; |
| 1985 | |
| 1986 | memset(iov, 0, sizeof(struct iovec)); |
| 1987 | memset(path, 0, 512); |
| 1988 | |
Dan Carpenter | 60d645a | 2011-06-15 10:03:05 -0700 | [diff] [blame] | 1989 | if (strlen(&wwn->unit_serial[0]) >= 512) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1990 | printk(KERN_ERR "WWN value for struct se_device does not fit" |
| 1991 | " into path buffer\n"); |
| 1992 | return -1; |
| 1993 | } |
| 1994 | |
| 1995 | snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); |
| 1996 | file = filp_open(path, flags, 0600); |
| 1997 | if (IS_ERR(file) || !file || !file->f_dentry) { |
| 1998 | printk(KERN_ERR "filp_open(%s) for APTPL metadata" |
| 1999 | " failed\n", path); |
| 2000 | return -1; |
| 2001 | } |
| 2002 | |
| 2003 | iov[0].iov_base = &buf[0]; |
| 2004 | if (!(pr_aptpl_buf_len)) |
| 2005 | iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ |
| 2006 | else |
| 2007 | iov[0].iov_len = pr_aptpl_buf_len; |
| 2008 | |
| 2009 | old_fs = get_fs(); |
| 2010 | set_fs(get_ds()); |
| 2011 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); |
| 2012 | set_fs(old_fs); |
| 2013 | |
| 2014 | if (ret < 0) { |
| 2015 | printk("Error writing APTPL metadata file: %s\n", path); |
| 2016 | filp_close(file, NULL); |
| 2017 | return -1; |
| 2018 | } |
| 2019 | filp_close(file, NULL); |
| 2020 | |
| 2021 | return 0; |
| 2022 | } |
| 2023 | |
| 2024 | static int core_scsi3_update_and_write_aptpl( |
| 2025 | struct se_device *dev, |
| 2026 | unsigned char *in_buf, |
| 2027 | u32 in_pr_aptpl_buf_len) |
| 2028 | { |
| 2029 | unsigned char null_buf[64], *buf; |
| 2030 | u32 pr_aptpl_buf_len; |
| 2031 | int ret, clear_aptpl_metadata = 0; |
| 2032 | /* |
| 2033 | * Can be called with a NULL pointer from PROUT service action CLEAR |
| 2034 | */ |
| 2035 | if (!(in_buf)) { |
| 2036 | memset(null_buf, 0, 64); |
| 2037 | buf = &null_buf[0]; |
| 2038 | /* |
| 2039 | * This will clear the APTPL metadata to: |
| 2040 | * "No Registrations or Reservations" status |
| 2041 | */ |
| 2042 | pr_aptpl_buf_len = 64; |
| 2043 | clear_aptpl_metadata = 1; |
| 2044 | } else { |
| 2045 | buf = in_buf; |
| 2046 | pr_aptpl_buf_len = in_pr_aptpl_buf_len; |
| 2047 | } |
| 2048 | |
| 2049 | ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, |
| 2050 | clear_aptpl_metadata); |
| 2051 | if (ret != 0) |
| 2052 | return -1; |
| 2053 | /* |
| 2054 | * __core_scsi3_write_aptpl_to_file() will call strlen() |
| 2055 | * on the passed buf to determine pr_aptpl_buf_len. |
| 2056 | */ |
| 2057 | ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); |
| 2058 | if (ret != 0) |
| 2059 | return -1; |
| 2060 | |
| 2061 | return ret; |
| 2062 | } |
| 2063 | |
| 2064 | static int core_scsi3_emulate_pro_register( |
| 2065 | struct se_cmd *cmd, |
| 2066 | u64 res_key, |
| 2067 | u64 sa_res_key, |
| 2068 | int aptpl, |
| 2069 | int all_tg_pt, |
| 2070 | int spec_i_pt, |
| 2071 | int ignore_key) |
| 2072 | { |
| 2073 | struct se_session *se_sess = SE_SESS(cmd); |
| 2074 | struct se_device *dev = SE_DEV(cmd); |
| 2075 | struct se_dev_entry *se_deve; |
| 2076 | struct se_lun *se_lun = SE_LUN(cmd); |
| 2077 | struct se_portal_group *se_tpg; |
| 2078 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; |
| 2079 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 2080 | /* Used for APTPL metadata w/ UNREGISTER */ |
| 2081 | unsigned char *pr_aptpl_buf = NULL; |
| 2082 | unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; |
| 2083 | int pr_holder = 0, ret = 0, type; |
| 2084 | |
| 2085 | if (!(se_sess) || !(se_lun)) { |
| 2086 | printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
| 2087 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2088 | } |
| 2089 | se_tpg = se_sess->se_tpg; |
| 2090 | se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 2091 | |
| 2092 | if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) { |
| 2093 | memset(&isid_buf[0], 0, PR_REG_ISID_LEN); |
| 2094 | TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, &isid_buf[0], |
| 2095 | PR_REG_ISID_LEN); |
| 2096 | isid_ptr = &isid_buf[0]; |
| 2097 | } |
| 2098 | /* |
| 2099 | * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 |
| 2100 | */ |
| 2101 | pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); |
| 2102 | if (!(pr_reg_e)) { |
| 2103 | if (res_key) { |
| 2104 | printk(KERN_WARNING "SPC-3 PR: Reservation Key non-zero" |
| 2105 | " for SA REGISTER, returning CONFLICT\n"); |
| 2106 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2107 | } |
| 2108 | /* |
| 2109 | * Do nothing but return GOOD status. |
| 2110 | */ |
| 2111 | if (!(sa_res_key)) |
| 2112 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 2113 | |
| 2114 | if (!(spec_i_pt)) { |
| 2115 | /* |
| 2116 | * Perform the Service Action REGISTER on the Initiator |
| 2117 | * Port Endpoint that the PRO was received from on the |
| 2118 | * Logical Unit of the SCSI device server. |
| 2119 | */ |
| 2120 | ret = core_scsi3_alloc_registration(SE_DEV(cmd), |
| 2121 | se_sess->se_node_acl, se_deve, isid_ptr, |
| 2122 | sa_res_key, all_tg_pt, aptpl, |
| 2123 | ignore_key, 0); |
| 2124 | if (ret != 0) { |
| 2125 | printk(KERN_ERR "Unable to allocate" |
| 2126 | " struct t10_pr_registration\n"); |
| 2127 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 2128 | } |
| 2129 | } else { |
| 2130 | /* |
| 2131 | * Register both the Initiator port that received |
| 2132 | * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI |
| 2133 | * TransportID from Parameter list and loop through |
| 2134 | * fabric dependent parameter list while calling |
| 2135 | * logic from of core_scsi3_alloc_registration() for |
| 2136 | * each TransportID provided SCSI Initiator Port/Device |
| 2137 | */ |
| 2138 | ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, |
| 2139 | isid_ptr, sa_res_key, all_tg_pt, aptpl); |
| 2140 | if (ret != 0) |
| 2141 | return ret; |
| 2142 | } |
| 2143 | /* |
| 2144 | * Nothing left to do for the APTPL=0 case. |
| 2145 | */ |
| 2146 | if (!(aptpl)) { |
| 2147 | pr_tmpl->pr_aptpl_active = 0; |
| 2148 | core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0); |
| 2149 | printk("SPC-3 PR: Set APTPL Bit Deactivated for" |
| 2150 | " REGISTER\n"); |
| 2151 | return 0; |
| 2152 | } |
| 2153 | /* |
| 2154 | * Locate the newly allocated local I_T Nexus *pr_reg, and |
| 2155 | * update the APTPL metadata information using its |
| 2156 | * preallocated *pr_reg->pr_aptpl_buf. |
| 2157 | */ |
| 2158 | pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), |
| 2159 | se_sess->se_node_acl, se_sess); |
| 2160 | |
| 2161 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 2162 | &pr_reg->pr_aptpl_buf[0], |
| 2163 | pr_tmpl->pr_aptpl_buf_len); |
| 2164 | if (!(ret)) { |
| 2165 | pr_tmpl->pr_aptpl_active = 1; |
| 2166 | printk("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); |
| 2167 | } |
| 2168 | |
| 2169 | core_scsi3_put_pr_reg(pr_reg); |
| 2170 | return ret; |
| 2171 | } else { |
| 2172 | /* |
| 2173 | * Locate the existing *pr_reg via struct se_node_acl pointers |
| 2174 | */ |
| 2175 | pr_reg = pr_reg_e; |
| 2176 | type = pr_reg->pr_res_type; |
| 2177 | |
| 2178 | if (!(ignore_key)) { |
| 2179 | if (res_key != pr_reg->pr_res_key) { |
| 2180 | printk(KERN_ERR "SPC-3 PR REGISTER: Received" |
| 2181 | " res_key: 0x%016Lx does not match" |
| 2182 | " existing SA REGISTER res_key:" |
| 2183 | " 0x%016Lx\n", res_key, |
| 2184 | pr_reg->pr_res_key); |
| 2185 | core_scsi3_put_pr_reg(pr_reg); |
| 2186 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2187 | } |
| 2188 | } |
| 2189 | if (spec_i_pt) { |
| 2190 | printk(KERN_ERR "SPC-3 PR UNREGISTER: SPEC_I_PT" |
| 2191 | " set while sa_res_key=0\n"); |
| 2192 | core_scsi3_put_pr_reg(pr_reg); |
| 2193 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 2194 | } |
| 2195 | /* |
| 2196 | * An existing ALL_TG_PT=1 registration being released |
| 2197 | * must also set ALL_TG_PT=1 in the incoming PROUT. |
| 2198 | */ |
| 2199 | if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { |
| 2200 | printk(KERN_ERR "SPC-3 PR UNREGISTER: ALL_TG_PT=1" |
| 2201 | " registration exists, but ALL_TG_PT=1 bit not" |
| 2202 | " present in received PROUT\n"); |
| 2203 | core_scsi3_put_pr_reg(pr_reg); |
| 2204 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 2205 | } |
| 2206 | /* |
| 2207 | * Allocate APTPL metadata buffer used for UNREGISTER ops |
| 2208 | */ |
| 2209 | if (aptpl) { |
| 2210 | pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, |
| 2211 | GFP_KERNEL); |
| 2212 | if (!(pr_aptpl_buf)) { |
| 2213 | printk(KERN_ERR "Unable to allocate" |
| 2214 | " pr_aptpl_buf\n"); |
| 2215 | core_scsi3_put_pr_reg(pr_reg); |
| 2216 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2217 | } |
| 2218 | } |
| 2219 | /* |
| 2220 | * sa_res_key=0 Unregister Reservation Key for registered I_T |
| 2221 | * Nexus sa_res_key=1 Change Reservation Key for registered I_T |
| 2222 | * Nexus. |
| 2223 | */ |
| 2224 | if (!(sa_res_key)) { |
| 2225 | pr_holder = core_scsi3_check_implict_release( |
| 2226 | SE_DEV(cmd), pr_reg); |
| 2227 | if (pr_holder < 0) { |
| 2228 | kfree(pr_aptpl_buf); |
| 2229 | core_scsi3_put_pr_reg(pr_reg); |
| 2230 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2231 | } |
| 2232 | |
| 2233 | spin_lock(&pr_tmpl->registration_lock); |
| 2234 | /* |
| 2235 | * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port |
| 2236 | * and matching pr_res_key. |
| 2237 | */ |
| 2238 | if (pr_reg->pr_reg_all_tg_pt) { |
| 2239 | list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, |
| 2240 | &pr_tmpl->registration_list, |
| 2241 | pr_reg_list) { |
| 2242 | |
| 2243 | if (!(pr_reg_p->pr_reg_all_tg_pt)) |
| 2244 | continue; |
| 2245 | |
| 2246 | if (pr_reg_p->pr_res_key != res_key) |
| 2247 | continue; |
| 2248 | |
| 2249 | if (pr_reg == pr_reg_p) |
| 2250 | continue; |
| 2251 | |
| 2252 | if (strcmp(pr_reg->pr_reg_nacl->initiatorname, |
| 2253 | pr_reg_p->pr_reg_nacl->initiatorname)) |
| 2254 | continue; |
| 2255 | |
| 2256 | __core_scsi3_free_registration(dev, |
| 2257 | pr_reg_p, NULL, 0); |
| 2258 | } |
| 2259 | } |
| 2260 | /* |
| 2261 | * Release the calling I_T Nexus registration now.. |
| 2262 | */ |
| 2263 | __core_scsi3_free_registration(SE_DEV(cmd), pr_reg, |
| 2264 | NULL, 1); |
| 2265 | /* |
| 2266 | * From spc4r17, section 5.7.11.3 Unregistering |
| 2267 | * |
| 2268 | * If the persistent reservation is a registrants only |
| 2269 | * type, the device server shall establish a unit |
| 2270 | * attention condition for the initiator port associated |
| 2271 | * with every registered I_T nexus except for the I_T |
| 2272 | * nexus on which the PERSISTENT RESERVE OUT command was |
| 2273 | * received, with the additional sense code set to |
| 2274 | * RESERVATIONS RELEASED. |
| 2275 | */ |
| 2276 | if (pr_holder && |
| 2277 | ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || |
| 2278 | (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { |
| 2279 | list_for_each_entry(pr_reg_p, |
| 2280 | &pr_tmpl->registration_list, |
| 2281 | pr_reg_list) { |
| 2282 | |
| 2283 | core_scsi3_ua_allocate( |
| 2284 | pr_reg_p->pr_reg_nacl, |
| 2285 | pr_reg_p->pr_res_mapped_lun, |
| 2286 | 0x2A, |
| 2287 | ASCQ_2AH_RESERVATIONS_RELEASED); |
| 2288 | } |
| 2289 | } |
| 2290 | spin_unlock(&pr_tmpl->registration_lock); |
| 2291 | |
| 2292 | if (!(aptpl)) { |
| 2293 | pr_tmpl->pr_aptpl_active = 0; |
| 2294 | core_scsi3_update_and_write_aptpl(dev, NULL, 0); |
| 2295 | printk("SPC-3 PR: Set APTPL Bit Deactivated" |
| 2296 | " for UNREGISTER\n"); |
| 2297 | return 0; |
| 2298 | } |
| 2299 | |
| 2300 | ret = core_scsi3_update_and_write_aptpl(dev, |
| 2301 | &pr_aptpl_buf[0], |
| 2302 | pr_tmpl->pr_aptpl_buf_len); |
| 2303 | if (!(ret)) { |
| 2304 | pr_tmpl->pr_aptpl_active = 1; |
| 2305 | printk("SPC-3 PR: Set APTPL Bit Activated" |
| 2306 | " for UNREGISTER\n"); |
| 2307 | } |
| 2308 | |
| 2309 | kfree(pr_aptpl_buf); |
| 2310 | return ret; |
| 2311 | } else { |
| 2312 | /* |
| 2313 | * Increment PRgeneration counter for struct se_device" |
| 2314 | * upon a successful REGISTER, see spc4r17 section 6.3.2 |
| 2315 | * READ_KEYS service action. |
| 2316 | */ |
| 2317 | pr_reg->pr_res_generation = core_scsi3_pr_generation( |
| 2318 | SE_DEV(cmd)); |
| 2319 | pr_reg->pr_res_key = sa_res_key; |
| 2320 | printk("SPC-3 PR [%s] REGISTER%s: Changed Reservation" |
| 2321 | " Key for %s to: 0x%016Lx PRgeneration:" |
| 2322 | " 0x%08x\n", CMD_TFO(cmd)->get_fabric_name(), |
| 2323 | (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", |
| 2324 | pr_reg->pr_reg_nacl->initiatorname, |
| 2325 | pr_reg->pr_res_key, pr_reg->pr_res_generation); |
| 2326 | |
| 2327 | if (!(aptpl)) { |
| 2328 | pr_tmpl->pr_aptpl_active = 0; |
| 2329 | core_scsi3_update_and_write_aptpl(dev, NULL, 0); |
| 2330 | core_scsi3_put_pr_reg(pr_reg); |
| 2331 | printk("SPC-3 PR: Set APTPL Bit Deactivated" |
| 2332 | " for REGISTER\n"); |
| 2333 | return 0; |
| 2334 | } |
| 2335 | |
| 2336 | ret = core_scsi3_update_and_write_aptpl(dev, |
| 2337 | &pr_aptpl_buf[0], |
| 2338 | pr_tmpl->pr_aptpl_buf_len); |
| 2339 | if (!(ret)) { |
| 2340 | pr_tmpl->pr_aptpl_active = 1; |
| 2341 | printk("SPC-3 PR: Set APTPL Bit Activated" |
| 2342 | " for REGISTER\n"); |
| 2343 | } |
| 2344 | |
| 2345 | kfree(pr_aptpl_buf); |
| 2346 | core_scsi3_put_pr_reg(pr_reg); |
| 2347 | } |
| 2348 | } |
| 2349 | return 0; |
| 2350 | } |
| 2351 | |
| 2352 | unsigned char *core_scsi3_pr_dump_type(int type) |
| 2353 | { |
| 2354 | switch (type) { |
| 2355 | case PR_TYPE_WRITE_EXCLUSIVE: |
| 2356 | return "Write Exclusive Access"; |
| 2357 | case PR_TYPE_EXCLUSIVE_ACCESS: |
| 2358 | return "Exclusive Access"; |
| 2359 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
| 2360 | return "Write Exclusive Access, Registrants Only"; |
| 2361 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
| 2362 | return "Exclusive Access, Registrants Only"; |
| 2363 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
| 2364 | return "Write Exclusive Access, All Registrants"; |
| 2365 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
| 2366 | return "Exclusive Access, All Registrants"; |
| 2367 | default: |
| 2368 | break; |
| 2369 | } |
| 2370 | |
| 2371 | return "Unknown SPC-3 PR Type"; |
| 2372 | } |
| 2373 | |
| 2374 | static int core_scsi3_pro_reserve( |
| 2375 | struct se_cmd *cmd, |
| 2376 | struct se_device *dev, |
| 2377 | int type, |
| 2378 | int scope, |
| 2379 | u64 res_key) |
| 2380 | { |
| 2381 | struct se_session *se_sess = SE_SESS(cmd); |
| 2382 | struct se_dev_entry *se_deve; |
| 2383 | struct se_lun *se_lun = SE_LUN(cmd); |
| 2384 | struct se_portal_group *se_tpg; |
| 2385 | struct t10_pr_registration *pr_reg, *pr_res_holder; |
| 2386 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 2387 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 2388 | int ret, prf_isid; |
| 2389 | |
| 2390 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 2391 | |
| 2392 | if (!(se_sess) || !(se_lun)) { |
| 2393 | printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
| 2394 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2395 | } |
| 2396 | se_tpg = se_sess->se_tpg; |
| 2397 | se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 2398 | /* |
| 2399 | * Locate the existing *pr_reg via struct se_node_acl pointers |
| 2400 | */ |
| 2401 | pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl, |
| 2402 | se_sess); |
| 2403 | if (!(pr_reg)) { |
| 2404 | printk(KERN_ERR "SPC-3 PR: Unable to locate" |
| 2405 | " PR_REGISTERED *pr_reg for RESERVE\n"); |
| 2406 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2407 | } |
| 2408 | /* |
| 2409 | * From spc4r17 Section 5.7.9: Reserving: |
| 2410 | * |
| 2411 | * An application client creates a persistent reservation by issuing |
| 2412 | * a PERSISTENT RESERVE OUT command with RESERVE service action through |
| 2413 | * a registered I_T nexus with the following parameters: |
| 2414 | * a) RESERVATION KEY set to the value of the reservation key that is |
| 2415 | * registered with the logical unit for the I_T nexus; and |
| 2416 | */ |
| 2417 | if (res_key != pr_reg->pr_res_key) { |
| 2418 | printk(KERN_ERR "SPC-3 PR RESERVE: Received res_key: 0x%016Lx" |
| 2419 | " does not match existing SA REGISTER res_key:" |
| 2420 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
| 2421 | core_scsi3_put_pr_reg(pr_reg); |
| 2422 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2423 | } |
| 2424 | /* |
| 2425 | * From spc4r17 Section 5.7.9: Reserving: |
| 2426 | * |
| 2427 | * From above: |
| 2428 | * b) TYPE field and SCOPE field set to the persistent reservation |
| 2429 | * being created. |
| 2430 | * |
| 2431 | * Only one persistent reservation is allowed at a time per logical unit |
| 2432 | * and that persistent reservation has a scope of LU_SCOPE. |
| 2433 | */ |
| 2434 | if (scope != PR_SCOPE_LU_SCOPE) { |
| 2435 | printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); |
| 2436 | core_scsi3_put_pr_reg(pr_reg); |
| 2437 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 2438 | } |
| 2439 | /* |
| 2440 | * See if we have an existing PR reservation holder pointer at |
| 2441 | * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration |
| 2442 | * *pr_res_holder. |
| 2443 | */ |
| 2444 | spin_lock(&dev->dev_reservation_lock); |
| 2445 | pr_res_holder = dev->dev_pr_res_holder; |
| 2446 | if ((pr_res_holder)) { |
| 2447 | /* |
| 2448 | * From spc4r17 Section 5.7.9: Reserving: |
| 2449 | * |
| 2450 | * If the device server receives a PERSISTENT RESERVE OUT |
| 2451 | * command from an I_T nexus other than a persistent reservation |
| 2452 | * holder (see 5.7.10) that attempts to create a persistent |
| 2453 | * reservation when a persistent reservation already exists for |
| 2454 | * the logical unit, then the command shall be completed with |
| 2455 | * RESERVATION CONFLICT status. |
| 2456 | */ |
| 2457 | if (pr_res_holder != pr_reg) { |
| 2458 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 2459 | printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from" |
| 2460 | " [%s]: %s while reservation already held by" |
| 2461 | " [%s]: %s, returning RESERVATION_CONFLICT\n", |
| 2462 | CMD_TFO(cmd)->get_fabric_name(), |
| 2463 | se_sess->se_node_acl->initiatorname, |
| 2464 | TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(), |
| 2465 | pr_res_holder->pr_reg_nacl->initiatorname); |
| 2466 | |
| 2467 | spin_unlock(&dev->dev_reservation_lock); |
| 2468 | core_scsi3_put_pr_reg(pr_reg); |
| 2469 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2470 | } |
| 2471 | /* |
| 2472 | * From spc4r17 Section 5.7.9: Reserving: |
| 2473 | * |
| 2474 | * If a persistent reservation holder attempts to modify the |
| 2475 | * type or scope of an existing persistent reservation, the |
| 2476 | * command shall be completed with RESERVATION CONFLICT status. |
| 2477 | */ |
| 2478 | if ((pr_res_holder->pr_res_type != type) || |
| 2479 | (pr_res_holder->pr_res_scope != scope)) { |
| 2480 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 2481 | printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from" |
| 2482 | " [%s]: %s trying to change TYPE and/or SCOPE," |
| 2483 | " while reservation already held by [%s]: %s," |
| 2484 | " returning RESERVATION_CONFLICT\n", |
| 2485 | CMD_TFO(cmd)->get_fabric_name(), |
| 2486 | se_sess->se_node_acl->initiatorname, |
| 2487 | TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(), |
| 2488 | pr_res_holder->pr_reg_nacl->initiatorname); |
| 2489 | |
| 2490 | spin_unlock(&dev->dev_reservation_lock); |
| 2491 | core_scsi3_put_pr_reg(pr_reg); |
| 2492 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2493 | } |
| 2494 | /* |
| 2495 | * From spc4r17 Section 5.7.9: Reserving: |
| 2496 | * |
| 2497 | * If the device server receives a PERSISTENT RESERVE OUT |
| 2498 | * command with RESERVE service action where the TYPE field and |
| 2499 | * the SCOPE field contain the same values as the existing type |
| 2500 | * and scope from a persistent reservation holder, it shall not |
| 2501 | * make any change to the existing persistent reservation and |
| 2502 | * shall completethe command with GOOD status. |
| 2503 | */ |
| 2504 | spin_unlock(&dev->dev_reservation_lock); |
| 2505 | core_scsi3_put_pr_reg(pr_reg); |
| 2506 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 2507 | } |
| 2508 | /* |
| 2509 | * Otherwise, our *pr_reg becomes the PR reservation holder for said |
| 2510 | * TYPE/SCOPE. Also set the received scope and type in *pr_reg. |
| 2511 | */ |
| 2512 | pr_reg->pr_res_scope = scope; |
| 2513 | pr_reg->pr_res_type = type; |
| 2514 | pr_reg->pr_res_holder = 1; |
| 2515 | dev->dev_pr_res_holder = pr_reg; |
| 2516 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 2517 | PR_REG_ISID_ID_LEN); |
| 2518 | |
| 2519 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: RESERVE created new" |
| 2520 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
| 2521 | CMD_TFO(cmd)->get_fabric_name(), core_scsi3_pr_dump_type(type), |
| 2522 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
| 2523 | printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n", |
| 2524 | CMD_TFO(cmd)->get_fabric_name(), |
| 2525 | se_sess->se_node_acl->initiatorname, |
| 2526 | (prf_isid) ? &i_buf[0] : ""); |
| 2527 | spin_unlock(&dev->dev_reservation_lock); |
| 2528 | |
| 2529 | if (pr_tmpl->pr_aptpl_active) { |
| 2530 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 2531 | &pr_reg->pr_aptpl_buf[0], |
| 2532 | pr_tmpl->pr_aptpl_buf_len); |
| 2533 | if (!(ret)) |
| 2534 | printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata" |
| 2535 | " for RESERVE\n"); |
| 2536 | } |
| 2537 | |
| 2538 | core_scsi3_put_pr_reg(pr_reg); |
| 2539 | return 0; |
| 2540 | } |
| 2541 | |
| 2542 | static int core_scsi3_emulate_pro_reserve( |
| 2543 | struct se_cmd *cmd, |
| 2544 | int type, |
| 2545 | int scope, |
| 2546 | u64 res_key) |
| 2547 | { |
| 2548 | struct se_device *dev = cmd->se_dev; |
| 2549 | int ret = 0; |
| 2550 | |
| 2551 | switch (type) { |
| 2552 | case PR_TYPE_WRITE_EXCLUSIVE: |
| 2553 | case PR_TYPE_EXCLUSIVE_ACCESS: |
| 2554 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
| 2555 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
| 2556 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
| 2557 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
| 2558 | ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); |
| 2559 | break; |
| 2560 | default: |
| 2561 | printk(KERN_ERR "SPC-3 PR: Unknown Service Action RESERVE Type:" |
| 2562 | " 0x%02x\n", type); |
| 2563 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 2564 | } |
| 2565 | |
| 2566 | return ret; |
| 2567 | } |
| 2568 | |
| 2569 | /* |
| 2570 | * Called with struct se_device->dev_reservation_lock held. |
| 2571 | */ |
| 2572 | static void __core_scsi3_complete_pro_release( |
| 2573 | struct se_device *dev, |
| 2574 | struct se_node_acl *se_nacl, |
| 2575 | struct t10_pr_registration *pr_reg, |
| 2576 | int explict) |
| 2577 | { |
| 2578 | struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; |
| 2579 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 2580 | int prf_isid; |
| 2581 | |
| 2582 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 2583 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 2584 | PR_REG_ISID_ID_LEN); |
| 2585 | /* |
| 2586 | * Go ahead and release the current PR reservation holder. |
| 2587 | */ |
| 2588 | dev->dev_pr_res_holder = NULL; |
| 2589 | |
| 2590 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: %s RELEASE cleared" |
| 2591 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
| 2592 | tfo->get_fabric_name(), (explict) ? "explict" : "implict", |
| 2593 | core_scsi3_pr_dump_type(pr_reg->pr_res_type), |
| 2594 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
| 2595 | printk(KERN_INFO "SPC-3 PR [%s] RELEASE Node: %s%s\n", |
| 2596 | tfo->get_fabric_name(), se_nacl->initiatorname, |
| 2597 | (prf_isid) ? &i_buf[0] : ""); |
| 2598 | /* |
| 2599 | * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE |
| 2600 | */ |
| 2601 | pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; |
| 2602 | } |
| 2603 | |
| 2604 | static int core_scsi3_emulate_pro_release( |
| 2605 | struct se_cmd *cmd, |
| 2606 | int type, |
| 2607 | int scope, |
| 2608 | u64 res_key) |
| 2609 | { |
| 2610 | struct se_device *dev = cmd->se_dev; |
| 2611 | struct se_session *se_sess = SE_SESS(cmd); |
| 2612 | struct se_lun *se_lun = SE_LUN(cmd); |
| 2613 | struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; |
| 2614 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 2615 | int ret, all_reg = 0; |
| 2616 | |
| 2617 | if (!(se_sess) || !(se_lun)) { |
| 2618 | printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
| 2619 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2620 | } |
| 2621 | /* |
| 2622 | * Locate the existing *pr_reg via struct se_node_acl pointers |
| 2623 | */ |
| 2624 | pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); |
| 2625 | if (!(pr_reg)) { |
| 2626 | printk(KERN_ERR "SPC-3 PR: Unable to locate" |
| 2627 | " PR_REGISTERED *pr_reg for RELEASE\n"); |
| 2628 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2629 | } |
| 2630 | /* |
| 2631 | * From spc4r17 Section 5.7.11.2 Releasing: |
| 2632 | * |
| 2633 | * If there is no persistent reservation or in response to a persistent |
| 2634 | * reservation release request from a registered I_T nexus that is not a |
| 2635 | * persistent reservation holder (see 5.7.10), the device server shall |
| 2636 | * do the following: |
| 2637 | * |
| 2638 | * a) Not release the persistent reservation, if any; |
| 2639 | * b) Not remove any registrations; and |
| 2640 | * c) Complete the command with GOOD status. |
| 2641 | */ |
| 2642 | spin_lock(&dev->dev_reservation_lock); |
| 2643 | pr_res_holder = dev->dev_pr_res_holder; |
| 2644 | if (!(pr_res_holder)) { |
| 2645 | /* |
| 2646 | * No persistent reservation, return GOOD status. |
| 2647 | */ |
| 2648 | spin_unlock(&dev->dev_reservation_lock); |
| 2649 | core_scsi3_put_pr_reg(pr_reg); |
| 2650 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 2651 | } |
| 2652 | if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| 2653 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) |
| 2654 | all_reg = 1; |
| 2655 | |
| 2656 | if ((all_reg == 0) && (pr_res_holder != pr_reg)) { |
| 2657 | /* |
| 2658 | * Non 'All Registrants' PR Type cases.. |
| 2659 | * Release request from a registered I_T nexus that is not a |
| 2660 | * persistent reservation holder. return GOOD status. |
| 2661 | */ |
| 2662 | spin_unlock(&dev->dev_reservation_lock); |
| 2663 | core_scsi3_put_pr_reg(pr_reg); |
| 2664 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 2665 | } |
| 2666 | /* |
| 2667 | * From spc4r17 Section 5.7.11.2 Releasing: |
| 2668 | * |
| 2669 | * Only the persistent reservation holder (see 5.7.10) is allowed to |
| 2670 | * release a persistent reservation. |
| 2671 | * |
| 2672 | * An application client releases the persistent reservation by issuing |
| 2673 | * a PERSISTENT RESERVE OUT command with RELEASE service action through |
| 2674 | * an I_T nexus that is a persistent reservation holder with the |
| 2675 | * following parameters: |
| 2676 | * |
| 2677 | * a) RESERVATION KEY field set to the value of the reservation key |
| 2678 | * that is registered with the logical unit for the I_T nexus; |
| 2679 | */ |
| 2680 | if (res_key != pr_reg->pr_res_key) { |
| 2681 | printk(KERN_ERR "SPC-3 PR RELEASE: Received res_key: 0x%016Lx" |
| 2682 | " does not match existing SA REGISTER res_key:" |
| 2683 | " 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
| 2684 | spin_unlock(&dev->dev_reservation_lock); |
| 2685 | core_scsi3_put_pr_reg(pr_reg); |
| 2686 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2687 | } |
| 2688 | /* |
| 2689 | * From spc4r17 Section 5.7.11.2 Releasing and above: |
| 2690 | * |
| 2691 | * b) TYPE field and SCOPE field set to match the persistent |
| 2692 | * reservation being released. |
| 2693 | */ |
| 2694 | if ((pr_res_holder->pr_res_type != type) || |
| 2695 | (pr_res_holder->pr_res_scope != scope)) { |
| 2696 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 2697 | printk(KERN_ERR "SPC-3 PR RELEASE: Attempted to release" |
| 2698 | " reservation from [%s]: %s with different TYPE " |
| 2699 | "and/or SCOPE while reservation already held by" |
| 2700 | " [%s]: %s, returning RESERVATION_CONFLICT\n", |
| 2701 | CMD_TFO(cmd)->get_fabric_name(), |
| 2702 | se_sess->se_node_acl->initiatorname, |
| 2703 | TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(), |
| 2704 | pr_res_holder->pr_reg_nacl->initiatorname); |
| 2705 | |
| 2706 | spin_unlock(&dev->dev_reservation_lock); |
| 2707 | core_scsi3_put_pr_reg(pr_reg); |
| 2708 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2709 | } |
| 2710 | /* |
| 2711 | * In response to a persistent reservation release request from the |
| 2712 | * persistent reservation holder the device server shall perform a |
| 2713 | * release by doing the following as an uninterrupted series of actions: |
| 2714 | * a) Release the persistent reservation; |
| 2715 | * b) Not remove any registration(s); |
| 2716 | * c) If the released persistent reservation is a registrants only type |
| 2717 | * or all registrants type persistent reservation, |
| 2718 | * the device server shall establish a unit attention condition for |
| 2719 | * the initiator port associated with every regis- |
| 2720 | * tered I_T nexus other than I_T nexus on which the PERSISTENT |
| 2721 | * RESERVE OUT command with RELEASE service action was received, |
| 2722 | * with the additional sense code set to RESERVATIONS RELEASED; and |
| 2723 | * d) If the persistent reservation is of any other type, the device |
| 2724 | * server shall not establish a unit attention condition. |
| 2725 | */ |
| 2726 | __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, |
| 2727 | pr_reg, 1); |
| 2728 | |
| 2729 | spin_unlock(&dev->dev_reservation_lock); |
| 2730 | |
| 2731 | if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && |
| 2732 | (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && |
| 2733 | (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && |
| 2734 | (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
| 2735 | /* |
| 2736 | * If no UNIT ATTENTION conditions will be established for |
| 2737 | * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS |
| 2738 | * go ahead and check for APTPL=1 update+write below |
| 2739 | */ |
| 2740 | goto write_aptpl; |
| 2741 | } |
| 2742 | |
| 2743 | spin_lock(&pr_tmpl->registration_lock); |
| 2744 | list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, |
| 2745 | pr_reg_list) { |
| 2746 | /* |
| 2747 | * Do not establish a UNIT ATTENTION condition |
| 2748 | * for the calling I_T Nexus |
| 2749 | */ |
| 2750 | if (pr_reg_p == pr_reg) |
| 2751 | continue; |
| 2752 | |
| 2753 | core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, |
| 2754 | pr_reg_p->pr_res_mapped_lun, |
| 2755 | 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); |
| 2756 | } |
| 2757 | spin_unlock(&pr_tmpl->registration_lock); |
| 2758 | |
| 2759 | write_aptpl: |
| 2760 | if (pr_tmpl->pr_aptpl_active) { |
| 2761 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 2762 | &pr_reg->pr_aptpl_buf[0], |
| 2763 | pr_tmpl->pr_aptpl_buf_len); |
| 2764 | if (!(ret)) |
| 2765 | printk("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); |
| 2766 | } |
| 2767 | |
| 2768 | core_scsi3_put_pr_reg(pr_reg); |
| 2769 | return 0; |
| 2770 | } |
| 2771 | |
| 2772 | static int core_scsi3_emulate_pro_clear( |
| 2773 | struct se_cmd *cmd, |
| 2774 | u64 res_key) |
| 2775 | { |
| 2776 | struct se_device *dev = cmd->se_dev; |
| 2777 | struct se_node_acl *pr_reg_nacl; |
| 2778 | struct se_session *se_sess = SE_SESS(cmd); |
| 2779 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 2780 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; |
| 2781 | u32 pr_res_mapped_lun = 0; |
| 2782 | int calling_it_nexus = 0; |
| 2783 | /* |
| 2784 | * Locate the existing *pr_reg via struct se_node_acl pointers |
| 2785 | */ |
| 2786 | pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd), |
| 2787 | se_sess->se_node_acl, se_sess); |
| 2788 | if (!(pr_reg_n)) { |
| 2789 | printk(KERN_ERR "SPC-3 PR: Unable to locate" |
| 2790 | " PR_REGISTERED *pr_reg for CLEAR\n"); |
| 2791 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2792 | } |
| 2793 | /* |
| 2794 | * From spc4r17 section 5.7.11.6, Clearing: |
| 2795 | * |
| 2796 | * Any application client may release the persistent reservation and |
| 2797 | * remove all registrations from a device server by issuing a |
| 2798 | * PERSISTENT RESERVE OUT command with CLEAR service action through a |
| 2799 | * registered I_T nexus with the following parameter: |
| 2800 | * |
| 2801 | * a) RESERVATION KEY field set to the value of the reservation key |
| 2802 | * that is registered with the logical unit for the I_T nexus. |
| 2803 | */ |
| 2804 | if (res_key != pr_reg_n->pr_res_key) { |
| 2805 | printk(KERN_ERR "SPC-3 PR REGISTER: Received" |
| 2806 | " res_key: 0x%016Lx does not match" |
| 2807 | " existing SA REGISTER res_key:" |
| 2808 | " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); |
| 2809 | core_scsi3_put_pr_reg(pr_reg_n); |
| 2810 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2811 | } |
| 2812 | /* |
| 2813 | * a) Release the persistent reservation, if any; |
| 2814 | */ |
| 2815 | spin_lock(&dev->dev_reservation_lock); |
| 2816 | pr_res_holder = dev->dev_pr_res_holder; |
| 2817 | if (pr_res_holder) { |
| 2818 | struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 2819 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
| 2820 | pr_res_holder, 0); |
| 2821 | } |
| 2822 | spin_unlock(&dev->dev_reservation_lock); |
| 2823 | /* |
| 2824 | * b) Remove all registration(s) (see spc4r17 5.7.7); |
| 2825 | */ |
| 2826 | spin_lock(&pr_tmpl->registration_lock); |
| 2827 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 2828 | &pr_tmpl->registration_list, pr_reg_list) { |
| 2829 | |
| 2830 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
| 2831 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
| 2832 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
| 2833 | __core_scsi3_free_registration(dev, pr_reg, NULL, |
| 2834 | calling_it_nexus); |
| 2835 | /* |
| 2836 | * e) Establish a unit attention condition for the initiator |
| 2837 | * port associated with every registered I_T nexus other |
| 2838 | * than the I_T nexus on which the PERSISTENT RESERVE OUT |
| 2839 | * command with CLEAR service action was received, with the |
| 2840 | * additional sense code set to RESERVATIONS PREEMPTED. |
| 2841 | */ |
| 2842 | if (!(calling_it_nexus)) |
| 2843 | core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, |
| 2844 | 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); |
| 2845 | } |
| 2846 | spin_unlock(&pr_tmpl->registration_lock); |
| 2847 | |
| 2848 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: CLEAR complete\n", |
| 2849 | CMD_TFO(cmd)->get_fabric_name()); |
| 2850 | |
| 2851 | if (pr_tmpl->pr_aptpl_active) { |
| 2852 | core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0); |
| 2853 | printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata" |
| 2854 | " for CLEAR\n"); |
| 2855 | } |
| 2856 | |
| 2857 | core_scsi3_pr_generation(dev); |
| 2858 | return 0; |
| 2859 | } |
| 2860 | |
| 2861 | /* |
| 2862 | * Called with struct se_device->dev_reservation_lock held. |
| 2863 | */ |
| 2864 | static void __core_scsi3_complete_pro_preempt( |
| 2865 | struct se_device *dev, |
| 2866 | struct t10_pr_registration *pr_reg, |
| 2867 | struct list_head *preempt_and_abort_list, |
| 2868 | int type, |
| 2869 | int scope, |
| 2870 | int abort) |
| 2871 | { |
| 2872 | struct se_node_acl *nacl = pr_reg->pr_reg_nacl; |
| 2873 | struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; |
| 2874 | char i_buf[PR_REG_ISID_ID_LEN]; |
| 2875 | int prf_isid; |
| 2876 | |
| 2877 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 2878 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 2879 | PR_REG_ISID_ID_LEN); |
| 2880 | /* |
| 2881 | * Do an implict RELEASE of the existing reservation. |
| 2882 | */ |
| 2883 | if (dev->dev_pr_res_holder) |
| 2884 | __core_scsi3_complete_pro_release(dev, nacl, |
| 2885 | dev->dev_pr_res_holder, 0); |
| 2886 | |
| 2887 | dev->dev_pr_res_holder = pr_reg; |
| 2888 | pr_reg->pr_res_holder = 1; |
| 2889 | pr_reg->pr_res_type = type; |
| 2890 | pr_reg->pr_res_scope = scope; |
| 2891 | |
| 2892 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: PREEMPT%s created new" |
| 2893 | " reservation holder TYPE: %s ALL_TG_PT: %d\n", |
| 2894 | tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", |
| 2895 | core_scsi3_pr_dump_type(type), |
| 2896 | (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); |
| 2897 | printk(KERN_INFO "SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", |
| 2898 | tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", |
| 2899 | nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); |
| 2900 | /* |
| 2901 | * For PREEMPT_AND_ABORT, add the preempting reservation's |
| 2902 | * struct t10_pr_registration to the list that will be compared |
| 2903 | * against received CDBs.. |
| 2904 | */ |
| 2905 | if (preempt_and_abort_list) |
| 2906 | list_add_tail(&pr_reg->pr_reg_abort_list, |
| 2907 | preempt_and_abort_list); |
| 2908 | } |
| 2909 | |
| 2910 | static void core_scsi3_release_preempt_and_abort( |
| 2911 | struct list_head *preempt_and_abort_list, |
| 2912 | struct t10_pr_registration *pr_reg_holder) |
| 2913 | { |
| 2914 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
| 2915 | |
| 2916 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, |
| 2917 | pr_reg_abort_list) { |
| 2918 | |
| 2919 | list_del(&pr_reg->pr_reg_abort_list); |
| 2920 | if (pr_reg_holder == pr_reg) |
| 2921 | continue; |
| 2922 | if (pr_reg->pr_res_holder) { |
| 2923 | printk(KERN_WARNING "pr_reg->pr_res_holder still set\n"); |
| 2924 | continue; |
| 2925 | } |
| 2926 | |
| 2927 | pr_reg->pr_reg_deve = NULL; |
| 2928 | pr_reg->pr_reg_nacl = NULL; |
| 2929 | kfree(pr_reg->pr_aptpl_buf); |
| 2930 | kmem_cache_free(t10_pr_reg_cache, pr_reg); |
| 2931 | } |
| 2932 | } |
| 2933 | |
| 2934 | int core_scsi3_check_cdb_abort_and_preempt( |
| 2935 | struct list_head *preempt_and_abort_list, |
| 2936 | struct se_cmd *cmd) |
| 2937 | { |
| 2938 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
| 2939 | |
| 2940 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, |
| 2941 | pr_reg_abort_list) { |
| 2942 | if (pr_reg->pr_res_key == cmd->pr_res_key) |
| 2943 | return 0; |
| 2944 | } |
| 2945 | |
| 2946 | return 1; |
| 2947 | } |
| 2948 | |
| 2949 | static int core_scsi3_pro_preempt( |
| 2950 | struct se_cmd *cmd, |
| 2951 | int type, |
| 2952 | int scope, |
| 2953 | u64 res_key, |
| 2954 | u64 sa_res_key, |
| 2955 | int abort) |
| 2956 | { |
| 2957 | struct se_device *dev = SE_DEV(cmd); |
| 2958 | struct se_dev_entry *se_deve; |
| 2959 | struct se_node_acl *pr_reg_nacl; |
| 2960 | struct se_session *se_sess = SE_SESS(cmd); |
| 2961 | struct list_head preempt_and_abort_list; |
| 2962 | struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; |
| 2963 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 2964 | u32 pr_res_mapped_lun = 0; |
| 2965 | int all_reg = 0, calling_it_nexus = 0, released_regs = 0; |
| 2966 | int prh_type = 0, prh_scope = 0, ret; |
| 2967 | |
| 2968 | if (!(se_sess)) |
| 2969 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2970 | |
| 2971 | se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 2972 | pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl, |
| 2973 | se_sess); |
| 2974 | if (!(pr_reg_n)) { |
| 2975 | printk(KERN_ERR "SPC-3 PR: Unable to locate" |
| 2976 | " PR_REGISTERED *pr_reg for PREEMPT%s\n", |
| 2977 | (abort) ? "_AND_ABORT" : ""); |
| 2978 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2979 | } |
| 2980 | if (pr_reg_n->pr_res_key != res_key) { |
| 2981 | core_scsi3_put_pr_reg(pr_reg_n); |
| 2982 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 2983 | } |
| 2984 | if (scope != PR_SCOPE_LU_SCOPE) { |
| 2985 | printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); |
| 2986 | core_scsi3_put_pr_reg(pr_reg_n); |
| 2987 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 2988 | } |
| 2989 | INIT_LIST_HEAD(&preempt_and_abort_list); |
| 2990 | |
| 2991 | spin_lock(&dev->dev_reservation_lock); |
| 2992 | pr_res_holder = dev->dev_pr_res_holder; |
| 2993 | if (pr_res_holder && |
| 2994 | ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| 2995 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) |
| 2996 | all_reg = 1; |
| 2997 | |
| 2998 | if (!(all_reg) && !(sa_res_key)) { |
| 2999 | spin_unlock(&dev->dev_reservation_lock); |
| 3000 | core_scsi3_put_pr_reg(pr_reg_n); |
| 3001 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3002 | } |
| 3003 | /* |
| 3004 | * From spc4r17, section 5.7.11.4.4 Removing Registrations: |
| 3005 | * |
| 3006 | * If the SERVICE ACTION RESERVATION KEY field does not identify a |
| 3007 | * persistent reservation holder or there is no persistent reservation |
| 3008 | * holder (i.e., there is no persistent reservation), then the device |
| 3009 | * server shall perform a preempt by doing the following in an |
| 3010 | * uninterrupted series of actions. (See below..) |
| 3011 | */ |
| 3012 | if (!(pr_res_holder) || (pr_res_holder->pr_res_key != sa_res_key)) { |
| 3013 | /* |
| 3014 | * No existing or SA Reservation Key matching reservations.. |
| 3015 | * |
| 3016 | * PROUT SA PREEMPT with All Registrant type reservations are |
| 3017 | * allowed to be processed without a matching SA Reservation Key |
| 3018 | */ |
| 3019 | spin_lock(&pr_tmpl->registration_lock); |
| 3020 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 3021 | &pr_tmpl->registration_list, pr_reg_list) { |
| 3022 | /* |
| 3023 | * Removing of registrations in non all registrants |
| 3024 | * type reservations without a matching SA reservation |
| 3025 | * key. |
| 3026 | * |
| 3027 | * a) Remove the registrations for all I_T nexuses |
| 3028 | * specified by the SERVICE ACTION RESERVATION KEY |
| 3029 | * field; |
| 3030 | * b) Ignore the contents of the SCOPE and TYPE fields; |
| 3031 | * c) Process tasks as defined in 5.7.1; and |
| 3032 | * d) Establish a unit attention condition for the |
| 3033 | * initiator port associated with every I_T nexus |
| 3034 | * that lost its registration other than the I_T |
| 3035 | * nexus on which the PERSISTENT RESERVE OUT command |
| 3036 | * was received, with the additional sense code set |
| 3037 | * to REGISTRATIONS PREEMPTED. |
| 3038 | */ |
| 3039 | if (!(all_reg)) { |
| 3040 | if (pr_reg->pr_res_key != sa_res_key) |
| 3041 | continue; |
| 3042 | |
| 3043 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
| 3044 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
| 3045 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
| 3046 | __core_scsi3_free_registration(dev, pr_reg, |
| 3047 | (abort) ? &preempt_and_abort_list : |
| 3048 | NULL, calling_it_nexus); |
| 3049 | released_regs++; |
| 3050 | } else { |
| 3051 | /* |
| 3052 | * Case for any existing all registrants type |
| 3053 | * reservation, follow logic in spc4r17 section |
| 3054 | * 5.7.11.4 Preempting, Table 52 and Figure 7. |
| 3055 | * |
| 3056 | * For a ZERO SA Reservation key, release |
| 3057 | * all other registrations and do an implict |
| 3058 | * release of active persistent reservation. |
| 3059 | * |
| 3060 | * For a non-ZERO SA Reservation key, only |
| 3061 | * release the matching reservation key from |
| 3062 | * registrations. |
| 3063 | */ |
| 3064 | if ((sa_res_key) && |
| 3065 | (pr_reg->pr_res_key != sa_res_key)) |
| 3066 | continue; |
| 3067 | |
| 3068 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
| 3069 | if (calling_it_nexus) |
| 3070 | continue; |
| 3071 | |
| 3072 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
| 3073 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
| 3074 | __core_scsi3_free_registration(dev, pr_reg, |
| 3075 | (abort) ? &preempt_and_abort_list : |
| 3076 | NULL, 0); |
| 3077 | released_regs++; |
| 3078 | } |
| 3079 | if (!(calling_it_nexus)) |
| 3080 | core_scsi3_ua_allocate(pr_reg_nacl, |
| 3081 | pr_res_mapped_lun, 0x2A, |
| 3082 | ASCQ_2AH_RESERVATIONS_PREEMPTED); |
| 3083 | } |
| 3084 | spin_unlock(&pr_tmpl->registration_lock); |
| 3085 | /* |
| 3086 | * If a PERSISTENT RESERVE OUT with a PREEMPT service action or |
| 3087 | * a PREEMPT AND ABORT service action sets the SERVICE ACTION |
| 3088 | * RESERVATION KEY field to a value that does not match any |
| 3089 | * registered reservation key, then the device server shall |
| 3090 | * complete the command with RESERVATION CONFLICT status. |
| 3091 | */ |
| 3092 | if (!(released_regs)) { |
| 3093 | spin_unlock(&dev->dev_reservation_lock); |
| 3094 | core_scsi3_put_pr_reg(pr_reg_n); |
| 3095 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 3096 | } |
| 3097 | /* |
| 3098 | * For an existing all registrants type reservation |
| 3099 | * with a zero SA rservation key, preempt the existing |
| 3100 | * reservation with the new PR type and scope. |
| 3101 | */ |
| 3102 | if (pr_res_holder && all_reg && !(sa_res_key)) { |
| 3103 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n, |
| 3104 | (abort) ? &preempt_and_abort_list : NULL, |
| 3105 | type, scope, abort); |
| 3106 | |
| 3107 | if (abort) |
| 3108 | core_scsi3_release_preempt_and_abort( |
| 3109 | &preempt_and_abort_list, pr_reg_n); |
| 3110 | } |
| 3111 | spin_unlock(&dev->dev_reservation_lock); |
| 3112 | |
| 3113 | if (pr_tmpl->pr_aptpl_active) { |
| 3114 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 3115 | &pr_reg_n->pr_aptpl_buf[0], |
| 3116 | pr_tmpl->pr_aptpl_buf_len); |
| 3117 | if (!(ret)) |
| 3118 | printk(KERN_INFO "SPC-3 PR: Updated APTPL" |
| 3119 | " metadata for PREEMPT%s\n", (abort) ? |
| 3120 | "_AND_ABORT" : ""); |
| 3121 | } |
| 3122 | |
| 3123 | core_scsi3_put_pr_reg(pr_reg_n); |
| 3124 | core_scsi3_pr_generation(SE_DEV(cmd)); |
| 3125 | return 0; |
| 3126 | } |
| 3127 | /* |
| 3128 | * The PREEMPTing SA reservation key matches that of the |
| 3129 | * existing persistent reservation, first, we check if |
| 3130 | * we are preempting our own reservation. |
| 3131 | * From spc4r17, section 5.7.11.4.3 Preempting |
| 3132 | * persistent reservations and registration handling |
| 3133 | * |
| 3134 | * If an all registrants persistent reservation is not |
| 3135 | * present, it is not an error for the persistent |
| 3136 | * reservation holder to preempt itself (i.e., a |
| 3137 | * PERSISTENT RESERVE OUT with a PREEMPT service action |
| 3138 | * or a PREEMPT AND ABORT service action with the |
| 3139 | * SERVICE ACTION RESERVATION KEY value equal to the |
| 3140 | * persistent reservation holder's reservation key that |
| 3141 | * is received from the persistent reservation holder). |
| 3142 | * In that case, the device server shall establish the |
| 3143 | * new persistent reservation and maintain the |
| 3144 | * registration. |
| 3145 | */ |
| 3146 | prh_type = pr_res_holder->pr_res_type; |
| 3147 | prh_scope = pr_res_holder->pr_res_scope; |
| 3148 | /* |
| 3149 | * If the SERVICE ACTION RESERVATION KEY field identifies a |
| 3150 | * persistent reservation holder (see 5.7.10), the device |
| 3151 | * server shall perform a preempt by doing the following as |
| 3152 | * an uninterrupted series of actions: |
| 3153 | * |
| 3154 | * a) Release the persistent reservation for the holder |
| 3155 | * identified by the SERVICE ACTION RESERVATION KEY field; |
| 3156 | */ |
| 3157 | if (pr_reg_n != pr_res_holder) |
| 3158 | __core_scsi3_complete_pro_release(dev, |
| 3159 | pr_res_holder->pr_reg_nacl, |
| 3160 | dev->dev_pr_res_holder, 0); |
| 3161 | /* |
| 3162 | * b) Remove the registrations for all I_T nexuses identified |
| 3163 | * by the SERVICE ACTION RESERVATION KEY field, except the |
| 3164 | * I_T nexus that is being used for the PERSISTENT RESERVE |
| 3165 | * OUT command. If an all registrants persistent reservation |
| 3166 | * is present and the SERVICE ACTION RESERVATION KEY field |
| 3167 | * is set to zero, then all registrations shall be removed |
| 3168 | * except for that of the I_T nexus that is being used for |
| 3169 | * the PERSISTENT RESERVE OUT command; |
| 3170 | */ |
| 3171 | spin_lock(&pr_tmpl->registration_lock); |
| 3172 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 3173 | &pr_tmpl->registration_list, pr_reg_list) { |
| 3174 | |
| 3175 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
| 3176 | if (calling_it_nexus) |
| 3177 | continue; |
| 3178 | |
| 3179 | if (pr_reg->pr_res_key != sa_res_key) |
| 3180 | continue; |
| 3181 | |
| 3182 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
| 3183 | pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; |
| 3184 | __core_scsi3_free_registration(dev, pr_reg, |
| 3185 | (abort) ? &preempt_and_abort_list : NULL, |
| 3186 | calling_it_nexus); |
| 3187 | /* |
| 3188 | * e) Establish a unit attention condition for the initiator |
| 3189 | * port associated with every I_T nexus that lost its |
| 3190 | * persistent reservation and/or registration, with the |
| 3191 | * additional sense code set to REGISTRATIONS PREEMPTED; |
| 3192 | */ |
| 3193 | core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, |
| 3194 | ASCQ_2AH_RESERVATIONS_PREEMPTED); |
| 3195 | } |
| 3196 | spin_unlock(&pr_tmpl->registration_lock); |
| 3197 | /* |
| 3198 | * c) Establish a persistent reservation for the preempting |
| 3199 | * I_T nexus using the contents of the SCOPE and TYPE fields; |
| 3200 | */ |
| 3201 | __core_scsi3_complete_pro_preempt(dev, pr_reg_n, |
| 3202 | (abort) ? &preempt_and_abort_list : NULL, |
| 3203 | type, scope, abort); |
| 3204 | /* |
| 3205 | * d) Process tasks as defined in 5.7.1; |
| 3206 | * e) See above.. |
| 3207 | * f) If the type or scope has changed, then for every I_T nexus |
| 3208 | * whose reservation key was not removed, except for the I_T |
| 3209 | * nexus on which the PERSISTENT RESERVE OUT command was |
| 3210 | * received, the device server shall establish a unit |
| 3211 | * attention condition for the initiator port associated with |
| 3212 | * that I_T nexus, with the additional sense code set to |
| 3213 | * RESERVATIONS RELEASED. If the type or scope have not |
| 3214 | * changed, then no unit attention condition(s) shall be |
| 3215 | * established for this reason. |
| 3216 | */ |
| 3217 | if ((prh_type != type) || (prh_scope != scope)) { |
| 3218 | spin_lock(&pr_tmpl->registration_lock); |
| 3219 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 3220 | &pr_tmpl->registration_list, pr_reg_list) { |
| 3221 | |
| 3222 | calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; |
| 3223 | if (calling_it_nexus) |
| 3224 | continue; |
| 3225 | |
| 3226 | core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, |
| 3227 | pr_reg->pr_res_mapped_lun, 0x2A, |
| 3228 | ASCQ_2AH_RESERVATIONS_RELEASED); |
| 3229 | } |
| 3230 | spin_unlock(&pr_tmpl->registration_lock); |
| 3231 | } |
| 3232 | spin_unlock(&dev->dev_reservation_lock); |
| 3233 | /* |
| 3234 | * Call LUN_RESET logic upon list of struct t10_pr_registration, |
| 3235 | * All received CDBs for the matching existing reservation and |
| 3236 | * registrations undergo ABORT_TASK logic. |
| 3237 | * |
| 3238 | * From there, core_scsi3_release_preempt_and_abort() will |
| 3239 | * release every registration in the list (which have already |
| 3240 | * been removed from the primary pr_reg list), except the |
| 3241 | * new persistent reservation holder, the calling Initiator Port. |
| 3242 | */ |
| 3243 | if (abort) { |
| 3244 | core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); |
| 3245 | core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, |
| 3246 | pr_reg_n); |
| 3247 | } |
| 3248 | |
| 3249 | if (pr_tmpl->pr_aptpl_active) { |
| 3250 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 3251 | &pr_reg_n->pr_aptpl_buf[0], |
| 3252 | pr_tmpl->pr_aptpl_buf_len); |
| 3253 | if (!(ret)) |
| 3254 | printk("SPC-3 PR: Updated APTPL metadata for PREEMPT" |
| 3255 | "%s\n", (abort) ? "_AND_ABORT" : ""); |
| 3256 | } |
| 3257 | |
| 3258 | core_scsi3_put_pr_reg(pr_reg_n); |
| 3259 | core_scsi3_pr_generation(SE_DEV(cmd)); |
| 3260 | return 0; |
| 3261 | } |
| 3262 | |
| 3263 | static int core_scsi3_emulate_pro_preempt( |
| 3264 | struct se_cmd *cmd, |
| 3265 | int type, |
| 3266 | int scope, |
| 3267 | u64 res_key, |
| 3268 | u64 sa_res_key, |
| 3269 | int abort) |
| 3270 | { |
| 3271 | int ret = 0; |
| 3272 | |
| 3273 | switch (type) { |
| 3274 | case PR_TYPE_WRITE_EXCLUSIVE: |
| 3275 | case PR_TYPE_EXCLUSIVE_ACCESS: |
| 3276 | case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
| 3277 | case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
| 3278 | case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
| 3279 | case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
| 3280 | ret = core_scsi3_pro_preempt(cmd, type, scope, |
| 3281 | res_key, sa_res_key, abort); |
| 3282 | break; |
| 3283 | default: |
| 3284 | printk(KERN_ERR "SPC-3 PR: Unknown Service Action PREEMPT%s" |
| 3285 | " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); |
| 3286 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3287 | } |
| 3288 | |
| 3289 | return ret; |
| 3290 | } |
| 3291 | |
| 3292 | |
| 3293 | static int core_scsi3_emulate_pro_register_and_move( |
| 3294 | struct se_cmd *cmd, |
| 3295 | u64 res_key, |
| 3296 | u64 sa_res_key, |
| 3297 | int aptpl, |
| 3298 | int unreg) |
| 3299 | { |
| 3300 | struct se_session *se_sess = SE_SESS(cmd); |
| 3301 | struct se_device *dev = SE_DEV(cmd); |
| 3302 | struct se_dev_entry *se_deve, *dest_se_deve = NULL; |
| 3303 | struct se_lun *se_lun = SE_LUN(cmd); |
| 3304 | struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; |
| 3305 | struct se_port *se_port; |
| 3306 | struct se_portal_group *se_tpg, *dest_se_tpg = NULL; |
| 3307 | struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; |
| 3308 | struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; |
| 3309 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 3310 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 3311 | unsigned char *initiator_str; |
| 3312 | char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; |
| 3313 | u32 tid_len, tmp_tid_len; |
| 3314 | int new_reg = 0, type, scope, ret, matching_iname, prf_isid; |
| 3315 | unsigned short rtpi; |
| 3316 | unsigned char proto_ident; |
| 3317 | |
| 3318 | if (!(se_sess) || !(se_lun)) { |
| 3319 | printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n"); |
| 3320 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3321 | } |
| 3322 | memset(dest_iport, 0, 64); |
| 3323 | memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
| 3324 | se_tpg = se_sess->se_tpg; |
| 3325 | tf_ops = TPG_TFO(se_tpg); |
| 3326 | se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; |
| 3327 | /* |
| 3328 | * Follow logic from spc4r17 Section 5.7.8, Table 50 -- |
| 3329 | * Register behaviors for a REGISTER AND MOVE service action |
| 3330 | * |
| 3331 | * Locate the existing *pr_reg via struct se_node_acl pointers |
| 3332 | */ |
| 3333 | pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl, |
| 3334 | se_sess); |
| 3335 | if (!(pr_reg)) { |
| 3336 | printk(KERN_ERR "SPC-3 PR: Unable to locate PR_REGISTERED" |
| 3337 | " *pr_reg for REGISTER_AND_MOVE\n"); |
| 3338 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3339 | } |
| 3340 | /* |
| 3341 | * The provided reservation key much match the existing reservation key |
| 3342 | * provided during this initiator's I_T nexus registration. |
| 3343 | */ |
| 3344 | if (res_key != pr_reg->pr_res_key) { |
| 3345 | printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received" |
| 3346 | " res_key: 0x%016Lx does not match existing SA REGISTER" |
| 3347 | " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); |
| 3348 | core_scsi3_put_pr_reg(pr_reg); |
| 3349 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 3350 | } |
| 3351 | /* |
| 3352 | * The service active reservation key needs to be non zero |
| 3353 | */ |
| 3354 | if (!(sa_res_key)) { |
| 3355 | printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received zero" |
| 3356 | " sa_res_key\n"); |
| 3357 | core_scsi3_put_pr_reg(pr_reg); |
| 3358 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3359 | } |
| 3360 | /* |
| 3361 | * Determine the Relative Target Port Identifier where the reservation |
| 3362 | * will be moved to for the TransportID containing SCSI initiator WWN |
| 3363 | * information. |
| 3364 | */ |
| 3365 | rtpi = (buf[18] & 0xff) << 8; |
| 3366 | rtpi |= buf[19] & 0xff; |
| 3367 | tid_len = (buf[20] & 0xff) << 24; |
| 3368 | tid_len |= (buf[21] & 0xff) << 16; |
| 3369 | tid_len |= (buf[22] & 0xff) << 8; |
| 3370 | tid_len |= buf[23] & 0xff; |
| 3371 | |
| 3372 | if ((tid_len + 24) != cmd->data_length) { |
| 3373 | printk(KERN_ERR "SPC-3 PR: Illegal tid_len: %u + 24 byte header" |
| 3374 | " does not equal CDB data_length: %u\n", tid_len, |
| 3375 | cmd->data_length); |
| 3376 | core_scsi3_put_pr_reg(pr_reg); |
| 3377 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3378 | } |
| 3379 | |
| 3380 | spin_lock(&dev->se_port_lock); |
| 3381 | list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { |
| 3382 | if (se_port->sep_rtpi != rtpi) |
| 3383 | continue; |
| 3384 | dest_se_tpg = se_port->sep_tpg; |
| 3385 | if (!(dest_se_tpg)) |
| 3386 | continue; |
| 3387 | dest_tf_ops = TPG_TFO(dest_se_tpg); |
| 3388 | if (!(dest_tf_ops)) |
| 3389 | continue; |
| 3390 | |
| 3391 | atomic_inc(&dest_se_tpg->tpg_pr_ref_count); |
| 3392 | smp_mb__after_atomic_inc(); |
| 3393 | spin_unlock(&dev->se_port_lock); |
| 3394 | |
| 3395 | ret = core_scsi3_tpg_depend_item(dest_se_tpg); |
| 3396 | if (ret != 0) { |
| 3397 | printk(KERN_ERR "core_scsi3_tpg_depend_item() failed" |
| 3398 | " for dest_se_tpg\n"); |
| 3399 | atomic_dec(&dest_se_tpg->tpg_pr_ref_count); |
| 3400 | smp_mb__after_atomic_dec(); |
| 3401 | core_scsi3_put_pr_reg(pr_reg); |
| 3402 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3403 | } |
| 3404 | |
| 3405 | spin_lock(&dev->se_port_lock); |
| 3406 | break; |
| 3407 | } |
| 3408 | spin_unlock(&dev->se_port_lock); |
| 3409 | |
| 3410 | if (!(dest_se_tpg) || (!dest_tf_ops)) { |
| 3411 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate" |
| 3412 | " fabric ops from Relative Target Port Identifier:" |
| 3413 | " %hu\n", rtpi); |
| 3414 | core_scsi3_put_pr_reg(pr_reg); |
| 3415 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3416 | } |
| 3417 | proto_ident = (buf[24] & 0x0f); |
| 3418 | #if 0 |
| 3419 | printk("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" |
| 3420 | " 0x%02x\n", proto_ident); |
| 3421 | #endif |
| 3422 | if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { |
| 3423 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Received" |
| 3424 | " proto_ident: 0x%02x does not match ident: 0x%02x" |
| 3425 | " from fabric: %s\n", proto_ident, |
| 3426 | dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), |
| 3427 | dest_tf_ops->get_fabric_name()); |
| 3428 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3429 | goto out; |
| 3430 | } |
| 3431 | if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { |
| 3432 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Fabric does not" |
| 3433 | " containg a valid tpg_parse_pr_out_transport_id" |
| 3434 | " function pointer\n"); |
| 3435 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3436 | goto out; |
| 3437 | } |
| 3438 | initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, |
| 3439 | (const char *)&buf[24], &tmp_tid_len, &iport_ptr); |
| 3440 | if (!(initiator_str)) { |
| 3441 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate" |
| 3442 | " initiator_str from Transport ID\n"); |
| 3443 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3444 | goto out; |
| 3445 | } |
| 3446 | |
| 3447 | printk(KERN_INFO "SPC-3 PR [%s] Extracted initiator %s identifier: %s" |
| 3448 | " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? |
| 3449 | "port" : "device", initiator_str, (iport_ptr != NULL) ? |
| 3450 | iport_ptr : ""); |
| 3451 | /* |
| 3452 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service |
| 3453 | * action specifies a TransportID that is the same as the initiator port |
| 3454 | * of the I_T nexus for the command received, then the command shall |
| 3455 | * be terminated with CHECK CONDITION status, with the sense key set to |
| 3456 | * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD |
| 3457 | * IN PARAMETER LIST. |
| 3458 | */ |
| 3459 | pr_reg_nacl = pr_reg->pr_reg_nacl; |
| 3460 | matching_iname = (!strcmp(initiator_str, |
| 3461 | pr_reg_nacl->initiatorname)) ? 1 : 0; |
| 3462 | if (!(matching_iname)) |
| 3463 | goto after_iport_check; |
| 3464 | |
| 3465 | if (!(iport_ptr) || !(pr_reg->isid_present_at_reg)) { |
| 3466 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" |
| 3467 | " matches: %s on received I_T Nexus\n", initiator_str, |
| 3468 | pr_reg_nacl->initiatorname); |
| 3469 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3470 | goto out; |
| 3471 | } |
| 3472 | if (!(strcmp(iport_ptr, pr_reg->pr_reg_isid))) { |
| 3473 | printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" |
| 3474 | " matches: %s %s on received I_T Nexus\n", |
| 3475 | initiator_str, iport_ptr, pr_reg_nacl->initiatorname, |
| 3476 | pr_reg->pr_reg_isid); |
| 3477 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3478 | goto out; |
| 3479 | } |
| 3480 | after_iport_check: |
| 3481 | /* |
| 3482 | * Locate the destination struct se_node_acl from the received Transport ID |
| 3483 | */ |
| 3484 | spin_lock_bh(&dest_se_tpg->acl_node_lock); |
| 3485 | dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, |
| 3486 | initiator_str); |
| 3487 | if (dest_node_acl) { |
| 3488 | atomic_inc(&dest_node_acl->acl_pr_ref_count); |
| 3489 | smp_mb__after_atomic_inc(); |
| 3490 | } |
| 3491 | spin_unlock_bh(&dest_se_tpg->acl_node_lock); |
| 3492 | |
| 3493 | if (!(dest_node_acl)) { |
| 3494 | printk(KERN_ERR "Unable to locate %s dest_node_acl for" |
| 3495 | " TransportID%s\n", dest_tf_ops->get_fabric_name(), |
| 3496 | initiator_str); |
| 3497 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3498 | goto out; |
| 3499 | } |
| 3500 | ret = core_scsi3_nodeacl_depend_item(dest_node_acl); |
| 3501 | if (ret != 0) { |
| 3502 | printk(KERN_ERR "core_scsi3_nodeacl_depend_item() for" |
| 3503 | " dest_node_acl\n"); |
| 3504 | atomic_dec(&dest_node_acl->acl_pr_ref_count); |
| 3505 | smp_mb__after_atomic_dec(); |
| 3506 | dest_node_acl = NULL; |
| 3507 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3508 | goto out; |
| 3509 | } |
| 3510 | #if 0 |
| 3511 | printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" |
| 3512 | " %s from TransportID\n", dest_tf_ops->get_fabric_name(), |
| 3513 | dest_node_acl->initiatorname); |
| 3514 | #endif |
| 3515 | /* |
| 3516 | * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET |
| 3517 | * PORT IDENTIFIER. |
| 3518 | */ |
| 3519 | dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); |
| 3520 | if (!(dest_se_deve)) { |
| 3521 | printk(KERN_ERR "Unable to locate %s dest_se_deve from RTPI:" |
| 3522 | " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); |
| 3523 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3524 | goto out; |
| 3525 | } |
| 3526 | |
| 3527 | ret = core_scsi3_lunacl_depend_item(dest_se_deve); |
| 3528 | if (ret < 0) { |
| 3529 | printk(KERN_ERR "core_scsi3_lunacl_depend_item() failed\n"); |
| 3530 | atomic_dec(&dest_se_deve->pr_ref_count); |
| 3531 | smp_mb__after_atomic_dec(); |
| 3532 | dest_se_deve = NULL; |
| 3533 | ret = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3534 | goto out; |
| 3535 | } |
| 3536 | #if 0 |
| 3537 | printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" |
| 3538 | " ACL for dest_se_deve->mapped_lun: %u\n", |
| 3539 | dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, |
| 3540 | dest_se_deve->mapped_lun); |
| 3541 | #endif |
| 3542 | /* |
| 3543 | * A persistent reservation needs to already existing in order to |
| 3544 | * successfully complete the REGISTER_AND_MOVE service action.. |
| 3545 | */ |
| 3546 | spin_lock(&dev->dev_reservation_lock); |
| 3547 | pr_res_holder = dev->dev_pr_res_holder; |
| 3548 | if (!(pr_res_holder)) { |
| 3549 | printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: No reservation" |
| 3550 | " currently held\n"); |
| 3551 | spin_unlock(&dev->dev_reservation_lock); |
| 3552 | ret = PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3553 | goto out; |
| 3554 | } |
| 3555 | /* |
| 3556 | * The received on I_T Nexus must be the reservation holder. |
| 3557 | * |
| 3558 | * From spc4r17 section 5.7.8 Table 50 -- |
| 3559 | * Register behaviors for a REGISTER AND MOVE service action |
| 3560 | */ |
| 3561 | if (pr_res_holder != pr_reg) { |
| 3562 | printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Calling I_T" |
| 3563 | " Nexus is not reservation holder\n"); |
| 3564 | spin_unlock(&dev->dev_reservation_lock); |
| 3565 | ret = PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 3566 | goto out; |
| 3567 | } |
| 3568 | /* |
| 3569 | * From spc4r17 section 5.7.8: registering and moving reservation |
| 3570 | * |
| 3571 | * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service |
| 3572 | * action is received and the established persistent reservation is a |
| 3573 | * Write Exclusive - All Registrants type or Exclusive Access - |
| 3574 | * All Registrants type reservation, then the command shall be completed |
| 3575 | * with RESERVATION CONFLICT status. |
| 3576 | */ |
| 3577 | if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| 3578 | (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
| 3579 | printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Unable to move" |
| 3580 | " reservation for type: %s\n", |
| 3581 | core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); |
| 3582 | spin_unlock(&dev->dev_reservation_lock); |
| 3583 | ret = PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 3584 | goto out; |
| 3585 | } |
| 3586 | pr_res_nacl = pr_res_holder->pr_reg_nacl; |
| 3587 | /* |
| 3588 | * b) Ignore the contents of the (received) SCOPE and TYPE fields; |
| 3589 | */ |
| 3590 | type = pr_res_holder->pr_res_type; |
| 3591 | scope = pr_res_holder->pr_res_type; |
| 3592 | /* |
| 3593 | * c) Associate the reservation key specified in the SERVICE ACTION |
| 3594 | * RESERVATION KEY field with the I_T nexus specified as the |
| 3595 | * destination of the register and move, where: |
| 3596 | * A) The I_T nexus is specified by the TransportID and the |
| 3597 | * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and |
| 3598 | * B) Regardless of the TransportID format used, the association for |
| 3599 | * the initiator port is based on either the initiator port name |
| 3600 | * (see 3.1.71) on SCSI transport protocols where port names are |
| 3601 | * required or the initiator port identifier (see 3.1.70) on SCSI |
| 3602 | * transport protocols where port names are not required; |
| 3603 | * d) Register the reservation key specified in the SERVICE ACTION |
| 3604 | * RESERVATION KEY field; |
| 3605 | * e) Retain the reservation key specified in the SERVICE ACTION |
| 3606 | * RESERVATION KEY field and associated information; |
| 3607 | * |
| 3608 | * Also, It is not an error for a REGISTER AND MOVE service action to |
| 3609 | * register an I_T nexus that is already registered with the same |
| 3610 | * reservation key or a different reservation key. |
| 3611 | */ |
| 3612 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
| 3613 | iport_ptr); |
| 3614 | if (!(dest_pr_reg)) { |
| 3615 | ret = core_scsi3_alloc_registration(SE_DEV(cmd), |
| 3616 | dest_node_acl, dest_se_deve, iport_ptr, |
| 3617 | sa_res_key, 0, aptpl, 2, 1); |
| 3618 | if (ret != 0) { |
| 3619 | spin_unlock(&dev->dev_reservation_lock); |
| 3620 | ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3621 | goto out; |
| 3622 | } |
| 3623 | dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, |
| 3624 | iport_ptr); |
| 3625 | new_reg = 1; |
| 3626 | } |
| 3627 | /* |
| 3628 | * f) Release the persistent reservation for the persistent reservation |
| 3629 | * holder (i.e., the I_T nexus on which the |
| 3630 | */ |
| 3631 | __core_scsi3_complete_pro_release(dev, pr_res_nacl, |
| 3632 | dev->dev_pr_res_holder, 0); |
| 3633 | /* |
| 3634 | * g) Move the persistent reservation to the specified I_T nexus using |
| 3635 | * the same scope and type as the persistent reservation released in |
| 3636 | * item f); and |
| 3637 | */ |
| 3638 | dev->dev_pr_res_holder = dest_pr_reg; |
| 3639 | dest_pr_reg->pr_res_holder = 1; |
| 3640 | dest_pr_reg->pr_res_type = type; |
| 3641 | pr_reg->pr_res_scope = scope; |
| 3642 | prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], |
| 3643 | PR_REG_ISID_ID_LEN); |
| 3644 | /* |
| 3645 | * Increment PRGeneration for existing registrations.. |
| 3646 | */ |
| 3647 | if (!(new_reg)) |
| 3648 | dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; |
| 3649 | spin_unlock(&dev->dev_reservation_lock); |
| 3650 | |
| 3651 | printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" |
| 3652 | " created new reservation holder TYPE: %s on object RTPI:" |
| 3653 | " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), |
| 3654 | core_scsi3_pr_dump_type(type), rtpi, |
| 3655 | dest_pr_reg->pr_res_generation); |
| 3656 | printk(KERN_INFO "SPC-3 PR Successfully moved reservation from" |
| 3657 | " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", |
| 3658 | tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, |
| 3659 | (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), |
| 3660 | dest_node_acl->initiatorname, (iport_ptr != NULL) ? |
| 3661 | iport_ptr : ""); |
| 3662 | /* |
| 3663 | * It is now safe to release configfs group dependencies for destination |
| 3664 | * of Transport ID Initiator Device/Port Identifier |
| 3665 | */ |
| 3666 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 3667 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 3668 | core_scsi3_tpg_undepend_item(dest_se_tpg); |
| 3669 | /* |
| 3670 | * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T |
| 3671 | * nexus on which PERSISTENT RESERVE OUT command was received. |
| 3672 | */ |
| 3673 | if (unreg) { |
| 3674 | spin_lock(&pr_tmpl->registration_lock); |
| 3675 | __core_scsi3_free_registration(dev, pr_reg, NULL, 1); |
| 3676 | spin_unlock(&pr_tmpl->registration_lock); |
| 3677 | } else |
| 3678 | core_scsi3_put_pr_reg(pr_reg); |
| 3679 | |
| 3680 | /* |
| 3681 | * Clear the APTPL metadata if APTPL has been disabled, otherwise |
| 3682 | * write out the updated metadata to struct file for this SCSI device. |
| 3683 | */ |
| 3684 | if (!(aptpl)) { |
| 3685 | pr_tmpl->pr_aptpl_active = 0; |
| 3686 | core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0); |
| 3687 | printk("SPC-3 PR: Set APTPL Bit Deactivated for" |
| 3688 | " REGISTER_AND_MOVE\n"); |
| 3689 | } else { |
| 3690 | pr_tmpl->pr_aptpl_active = 1; |
| 3691 | ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd), |
| 3692 | &dest_pr_reg->pr_aptpl_buf[0], |
| 3693 | pr_tmpl->pr_aptpl_buf_len); |
| 3694 | if (!(ret)) |
| 3695 | printk("SPC-3 PR: Set APTPL Bit Activated for" |
| 3696 | " REGISTER_AND_MOVE\n"); |
| 3697 | } |
| 3698 | |
| 3699 | core_scsi3_put_pr_reg(dest_pr_reg); |
| 3700 | return 0; |
| 3701 | out: |
| 3702 | if (dest_se_deve) |
| 3703 | core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 3704 | if (dest_node_acl) |
| 3705 | core_scsi3_nodeacl_undepend_item(dest_node_acl); |
| 3706 | core_scsi3_tpg_undepend_item(dest_se_tpg); |
| 3707 | core_scsi3_put_pr_reg(pr_reg); |
| 3708 | return ret; |
| 3709 | } |
| 3710 | |
| 3711 | static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) |
| 3712 | { |
| 3713 | unsigned int __v1, __v2; |
| 3714 | |
| 3715 | __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; |
| 3716 | __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; |
| 3717 | |
| 3718 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 3719 | } |
| 3720 | |
| 3721 | /* |
| 3722 | * See spc4r17 section 6.14 Table 170 |
| 3723 | */ |
| 3724 | static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb) |
| 3725 | { |
| 3726 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 3727 | u64 res_key, sa_res_key; |
| 3728 | int sa, scope, type, aptpl; |
| 3729 | int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; |
| 3730 | /* |
| 3731 | * FIXME: A NULL struct se_session pointer means an this is not coming from |
| 3732 | * a $FABRIC_MOD's nexus, but from internal passthrough ops. |
| 3733 | */ |
| 3734 | if (!(SE_SESS(cmd))) |
| 3735 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 3736 | |
| 3737 | if (cmd->data_length < 24) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3738 | printk(KERN_WARNING "SPC-PR: Received PR OUT parameter list" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3739 | " length too small: %u\n", cmd->data_length); |
| 3740 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3741 | } |
| 3742 | /* |
| 3743 | * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) |
| 3744 | */ |
| 3745 | sa = (cdb[1] & 0x1f); |
| 3746 | scope = (cdb[2] & 0xf0); |
| 3747 | type = (cdb[2] & 0x0f); |
| 3748 | /* |
| 3749 | * From PERSISTENT_RESERVE_OUT parameter list (payload) |
| 3750 | */ |
| 3751 | res_key = core_scsi3_extract_reservation_key(&buf[0]); |
| 3752 | sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); |
| 3753 | /* |
| 3754 | * REGISTER_AND_MOVE uses a different SA parameter list containing |
| 3755 | * SCSI TransportIDs. |
| 3756 | */ |
| 3757 | if (sa != PRO_REGISTER_AND_MOVE) { |
| 3758 | spec_i_pt = (buf[20] & 0x08); |
| 3759 | all_tg_pt = (buf[20] & 0x04); |
| 3760 | aptpl = (buf[20] & 0x01); |
| 3761 | } else { |
| 3762 | aptpl = (buf[17] & 0x01); |
| 3763 | unreg = (buf[17] & 0x02); |
| 3764 | } |
| 3765 | /* |
| 3766 | * SPEC_I_PT=1 is only valid for Service action: REGISTER |
| 3767 | */ |
| 3768 | if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) |
| 3769 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3770 | /* |
| 3771 | * From spc4r17 section 6.14: |
| 3772 | * |
| 3773 | * If the SPEC_I_PT bit is set to zero, the service action is not |
| 3774 | * REGISTER AND MOVE, and the parameter list length is not 24, then |
| 3775 | * the command shall be terminated with CHECK CONDITION status, with |
| 3776 | * the sense key set to ILLEGAL REQUEST, and the additional sense |
| 3777 | * code set to PARAMETER LIST LENGTH ERROR. |
| 3778 | */ |
| 3779 | if (!(spec_i_pt) && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && |
| 3780 | (cmd->data_length != 24)) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3781 | printk(KERN_WARNING "SPC-PR: Received PR OUT illegal parameter" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3782 | " list length: %u\n", cmd->data_length); |
| 3783 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 3784 | } |
| 3785 | /* |
| 3786 | * (core_scsi3_emulate_pro_* function parameters |
| 3787 | * are defined by spc4r17 Table 174: |
| 3788 | * PERSISTENT_RESERVE_OUT service actions and valid parameters. |
| 3789 | */ |
| 3790 | switch (sa) { |
| 3791 | case PRO_REGISTER: |
| 3792 | return core_scsi3_emulate_pro_register(cmd, |
| 3793 | res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); |
| 3794 | case PRO_RESERVE: |
| 3795 | return core_scsi3_emulate_pro_reserve(cmd, |
| 3796 | type, scope, res_key); |
| 3797 | case PRO_RELEASE: |
| 3798 | return core_scsi3_emulate_pro_release(cmd, |
| 3799 | type, scope, res_key); |
| 3800 | case PRO_CLEAR: |
| 3801 | return core_scsi3_emulate_pro_clear(cmd, res_key); |
| 3802 | case PRO_PREEMPT: |
| 3803 | return core_scsi3_emulate_pro_preempt(cmd, type, scope, |
| 3804 | res_key, sa_res_key, 0); |
| 3805 | case PRO_PREEMPT_AND_ABORT: |
| 3806 | return core_scsi3_emulate_pro_preempt(cmd, type, scope, |
| 3807 | res_key, sa_res_key, 1); |
| 3808 | case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: |
| 3809 | return core_scsi3_emulate_pro_register(cmd, |
| 3810 | 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); |
| 3811 | case PRO_REGISTER_AND_MOVE: |
| 3812 | return core_scsi3_emulate_pro_register_and_move(cmd, res_key, |
| 3813 | sa_res_key, aptpl, unreg); |
| 3814 | default: |
| 3815 | printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service" |
| 3816 | " action: 0x%02x\n", cdb[1] & 0x1f); |
| 3817 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3818 | } |
| 3819 | |
| 3820 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3821 | } |
| 3822 | |
| 3823 | /* |
| 3824 | * PERSISTENT_RESERVE_IN Service Action READ_KEYS |
| 3825 | * |
| 3826 | * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 |
| 3827 | */ |
| 3828 | static int core_scsi3_pri_read_keys(struct se_cmd *cmd) |
| 3829 | { |
| 3830 | struct se_device *se_dev = SE_DEV(cmd); |
| 3831 | struct se_subsystem_dev *su_dev = SU_DEV(se_dev); |
| 3832 | struct t10_pr_registration *pr_reg; |
| 3833 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 3834 | u32 add_len = 0, off = 8; |
| 3835 | |
| 3836 | if (cmd->data_length < 8) { |
| 3837 | printk(KERN_ERR "PRIN SA READ_KEYS SCSI Data Length: %u" |
| 3838 | " too small\n", cmd->data_length); |
| 3839 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3840 | } |
| 3841 | |
| 3842 | buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff); |
| 3843 | buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff); |
| 3844 | buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff); |
| 3845 | buf[3] = (T10_RES(su_dev)->pr_generation & 0xff); |
| 3846 | |
| 3847 | spin_lock(&T10_RES(su_dev)->registration_lock); |
| 3848 | list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list, |
| 3849 | pr_reg_list) { |
| 3850 | /* |
| 3851 | * Check for overflow of 8byte PRI READ_KEYS payload and |
| 3852 | * next reservation key list descriptor. |
| 3853 | */ |
| 3854 | if ((add_len + 8) > (cmd->data_length - 8)) |
| 3855 | break; |
| 3856 | |
| 3857 | buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
| 3858 | buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
| 3859 | buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
| 3860 | buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
| 3861 | buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
| 3862 | buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
| 3863 | buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
| 3864 | buf[off++] = (pr_reg->pr_res_key & 0xff); |
| 3865 | |
| 3866 | add_len += 8; |
| 3867 | } |
| 3868 | spin_unlock(&T10_RES(su_dev)->registration_lock); |
| 3869 | |
| 3870 | buf[4] = ((add_len >> 24) & 0xff); |
| 3871 | buf[5] = ((add_len >> 16) & 0xff); |
| 3872 | buf[6] = ((add_len >> 8) & 0xff); |
| 3873 | buf[7] = (add_len & 0xff); |
| 3874 | |
| 3875 | return 0; |
| 3876 | } |
| 3877 | |
| 3878 | /* |
| 3879 | * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION |
| 3880 | * |
| 3881 | * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 |
| 3882 | */ |
| 3883 | static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) |
| 3884 | { |
| 3885 | struct se_device *se_dev = SE_DEV(cmd); |
| 3886 | struct se_subsystem_dev *su_dev = SU_DEV(se_dev); |
| 3887 | struct t10_pr_registration *pr_reg; |
| 3888 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 3889 | u64 pr_res_key; |
| 3890 | u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ |
| 3891 | |
| 3892 | if (cmd->data_length < 8) { |
| 3893 | printk(KERN_ERR "PRIN SA READ_RESERVATIONS SCSI Data Length: %u" |
| 3894 | " too small\n", cmd->data_length); |
| 3895 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3896 | } |
| 3897 | |
| 3898 | buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff); |
| 3899 | buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff); |
| 3900 | buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff); |
| 3901 | buf[3] = (T10_RES(su_dev)->pr_generation & 0xff); |
| 3902 | |
| 3903 | spin_lock(&se_dev->dev_reservation_lock); |
| 3904 | pr_reg = se_dev->dev_pr_res_holder; |
| 3905 | if ((pr_reg)) { |
| 3906 | /* |
| 3907 | * Set the hardcoded Additional Length |
| 3908 | */ |
| 3909 | buf[4] = ((add_len >> 24) & 0xff); |
| 3910 | buf[5] = ((add_len >> 16) & 0xff); |
| 3911 | buf[6] = ((add_len >> 8) & 0xff); |
| 3912 | buf[7] = (add_len & 0xff); |
| 3913 | |
| 3914 | if (cmd->data_length < 22) { |
| 3915 | spin_unlock(&se_dev->dev_reservation_lock); |
| 3916 | return 0; |
| 3917 | } |
| 3918 | /* |
| 3919 | * Set the Reservation key. |
| 3920 | * |
| 3921 | * From spc4r17, section 5.7.10: |
| 3922 | * A persistent reservation holder has its reservation key |
| 3923 | * returned in the parameter data from a PERSISTENT |
| 3924 | * RESERVE IN command with READ RESERVATION service action as |
| 3925 | * follows: |
| 3926 | * a) For a persistent reservation of the type Write Exclusive |
| 3927 | * - All Registrants or Exclusive Access  All Regitrants, |
| 3928 | * the reservation key shall be set to zero; or |
| 3929 | * b) For all other persistent reservation types, the |
| 3930 | * reservation key shall be set to the registered |
| 3931 | * reservation key for the I_T nexus that holds the |
| 3932 | * persistent reservation. |
| 3933 | */ |
| 3934 | if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| 3935 | (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) |
| 3936 | pr_res_key = 0; |
| 3937 | else |
| 3938 | pr_res_key = pr_reg->pr_res_key; |
| 3939 | |
| 3940 | buf[8] = ((pr_res_key >> 56) & 0xff); |
| 3941 | buf[9] = ((pr_res_key >> 48) & 0xff); |
| 3942 | buf[10] = ((pr_res_key >> 40) & 0xff); |
| 3943 | buf[11] = ((pr_res_key >> 32) & 0xff); |
| 3944 | buf[12] = ((pr_res_key >> 24) & 0xff); |
| 3945 | buf[13] = ((pr_res_key >> 16) & 0xff); |
| 3946 | buf[14] = ((pr_res_key >> 8) & 0xff); |
| 3947 | buf[15] = (pr_res_key & 0xff); |
| 3948 | /* |
| 3949 | * Set the SCOPE and TYPE |
| 3950 | */ |
| 3951 | buf[21] = (pr_reg->pr_res_scope & 0xf0) | |
| 3952 | (pr_reg->pr_res_type & 0x0f); |
| 3953 | } |
| 3954 | spin_unlock(&se_dev->dev_reservation_lock); |
| 3955 | |
| 3956 | return 0; |
| 3957 | } |
| 3958 | |
| 3959 | /* |
| 3960 | * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES |
| 3961 | * |
| 3962 | * See spc4r17 section 6.13.4 Table 165 |
| 3963 | */ |
| 3964 | static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) |
| 3965 | { |
| 3966 | struct se_device *dev = SE_DEV(cmd); |
| 3967 | struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation; |
| 3968 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 3969 | u16 add_len = 8; /* Hardcoded to 8. */ |
| 3970 | |
| 3971 | if (cmd->data_length < 6) { |
| 3972 | printk(KERN_ERR "PRIN SA REPORT_CAPABILITIES SCSI Data Length:" |
| 3973 | " %u too small\n", cmd->data_length); |
| 3974 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 3975 | } |
| 3976 | |
| 3977 | buf[0] = ((add_len << 8) & 0xff); |
| 3978 | buf[1] = (add_len & 0xff); |
| 3979 | buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ |
| 3980 | buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ |
| 3981 | buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ |
| 3982 | buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ |
| 3983 | /* |
| 3984 | * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so |
| 3985 | * set the TMV: Task Mask Valid bit. |
| 3986 | */ |
| 3987 | buf[3] |= 0x80; |
| 3988 | /* |
| 3989 | * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 |
| 3990 | */ |
| 3991 | buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ |
| 3992 | /* |
| 3993 | * PTPL_A: Persistence across Target Power Loss Active bit |
| 3994 | */ |
| 3995 | if (pr_tmpl->pr_aptpl_active) |
| 3996 | buf[3] |= 0x01; |
| 3997 | /* |
| 3998 | * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 |
| 3999 | */ |
| 4000 | buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ |
| 4001 | buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ |
| 4002 | buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ |
| 4003 | buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ |
| 4004 | buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ |
| 4005 | buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ |
| 4006 | |
| 4007 | return 0; |
| 4008 | } |
| 4009 | |
| 4010 | /* |
| 4011 | * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS |
| 4012 | * |
| 4013 | * See spc4r17 section 6.13.5 Table 168 and 169 |
| 4014 | */ |
| 4015 | static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) |
| 4016 | { |
| 4017 | struct se_device *se_dev = SE_DEV(cmd); |
| 4018 | struct se_node_acl *se_nacl; |
| 4019 | struct se_subsystem_dev *su_dev = SU_DEV(se_dev); |
| 4020 | struct se_portal_group *se_tpg; |
| 4021 | struct t10_pr_registration *pr_reg, *pr_reg_tmp; |
| 4022 | struct t10_reservation_template *pr_tmpl = &SU_DEV(se_dev)->t10_reservation; |
| 4023 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 4024 | u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; |
| 4025 | u32 off = 8; /* off into first Full Status descriptor */ |
| 4026 | int format_code = 0; |
| 4027 | |
| 4028 | if (cmd->data_length < 8) { |
| 4029 | printk(KERN_ERR "PRIN SA READ_FULL_STATUS SCSI Data Length: %u" |
| 4030 | " too small\n", cmd->data_length); |
| 4031 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 4032 | } |
| 4033 | |
| 4034 | buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff); |
| 4035 | buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff); |
| 4036 | buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff); |
| 4037 | buf[3] = (T10_RES(su_dev)->pr_generation & 0xff); |
| 4038 | |
| 4039 | spin_lock(&pr_tmpl->registration_lock); |
| 4040 | list_for_each_entry_safe(pr_reg, pr_reg_tmp, |
| 4041 | &pr_tmpl->registration_list, pr_reg_list) { |
| 4042 | |
| 4043 | se_nacl = pr_reg->pr_reg_nacl; |
| 4044 | se_tpg = pr_reg->pr_reg_nacl->se_tpg; |
| 4045 | add_desc_len = 0; |
| 4046 | |
| 4047 | atomic_inc(&pr_reg->pr_res_holders); |
| 4048 | smp_mb__after_atomic_inc(); |
| 4049 | spin_unlock(&pr_tmpl->registration_lock); |
| 4050 | /* |
| 4051 | * Determine expected length of $FABRIC_MOD specific |
| 4052 | * TransportID full status descriptor.. |
| 4053 | */ |
| 4054 | exp_desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id_len( |
| 4055 | se_tpg, se_nacl, pr_reg, &format_code); |
| 4056 | |
| 4057 | if ((exp_desc_len + add_len) > cmd->data_length) { |
| 4058 | printk(KERN_WARNING "SPC-3 PRIN READ_FULL_STATUS ran" |
| 4059 | " out of buffer: %d\n", cmd->data_length); |
| 4060 | spin_lock(&pr_tmpl->registration_lock); |
| 4061 | atomic_dec(&pr_reg->pr_res_holders); |
| 4062 | smp_mb__after_atomic_dec(); |
| 4063 | break; |
| 4064 | } |
| 4065 | /* |
| 4066 | * Set RESERVATION KEY |
| 4067 | */ |
| 4068 | buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
| 4069 | buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
| 4070 | buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
| 4071 | buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
| 4072 | buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
| 4073 | buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
| 4074 | buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
| 4075 | buf[off++] = (pr_reg->pr_res_key & 0xff); |
| 4076 | off += 4; /* Skip Over Reserved area */ |
| 4077 | |
| 4078 | /* |
| 4079 | * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. |
| 4080 | */ |
| 4081 | if (pr_reg->pr_reg_all_tg_pt) |
| 4082 | buf[off] = 0x02; |
| 4083 | /* |
| 4084 | * The struct se_lun pointer will be present for the |
| 4085 | * reservation holder for PR_HOLDER bit. |
| 4086 | * |
| 4087 | * Also, if this registration is the reservation |
| 4088 | * holder, fill in SCOPE and TYPE in the next byte. |
| 4089 | */ |
| 4090 | if (pr_reg->pr_res_holder) { |
| 4091 | buf[off++] |= 0x01; |
| 4092 | buf[off++] = (pr_reg->pr_res_scope & 0xf0) | |
| 4093 | (pr_reg->pr_res_type & 0x0f); |
| 4094 | } else |
| 4095 | off += 2; |
| 4096 | |
| 4097 | off += 4; /* Skip over reserved area */ |
| 4098 | /* |
| 4099 | * From spc4r17 6.3.15: |
| 4100 | * |
| 4101 | * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT |
| 4102 | * IDENTIFIER field contains the relative port identifier (see |
| 4103 | * 3.1.120) of the target port that is part of the I_T nexus |
| 4104 | * described by this full status descriptor. If the ALL_TG_PT |
| 4105 | * bit is set to one, the contents of the RELATIVE TARGET PORT |
| 4106 | * IDENTIFIER field are not defined by this standard. |
| 4107 | */ |
| 4108 | if (!(pr_reg->pr_reg_all_tg_pt)) { |
| 4109 | struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; |
| 4110 | |
| 4111 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); |
| 4112 | buf[off++] = (port->sep_rtpi & 0xff); |
| 4113 | } else |
| 4114 | off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ |
| 4115 | |
| 4116 | /* |
| 4117 | * Now, have the $FABRIC_MOD fill in the protocol identifier |
| 4118 | */ |
| 4119 | desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id(se_tpg, |
| 4120 | se_nacl, pr_reg, &format_code, &buf[off+4]); |
| 4121 | |
| 4122 | spin_lock(&pr_tmpl->registration_lock); |
| 4123 | atomic_dec(&pr_reg->pr_res_holders); |
| 4124 | smp_mb__after_atomic_dec(); |
| 4125 | /* |
| 4126 | * Set the ADDITIONAL DESCRIPTOR LENGTH |
| 4127 | */ |
| 4128 | buf[off++] = ((desc_len >> 24) & 0xff); |
| 4129 | buf[off++] = ((desc_len >> 16) & 0xff); |
| 4130 | buf[off++] = ((desc_len >> 8) & 0xff); |
| 4131 | buf[off++] = (desc_len & 0xff); |
| 4132 | /* |
| 4133 | * Size of full desctipor header minus TransportID |
| 4134 | * containing $FABRIC_MOD specific) initiator device/port |
| 4135 | * WWN information. |
| 4136 | * |
| 4137 | * See spc4r17 Section 6.13.5 Table 169 |
| 4138 | */ |
| 4139 | add_desc_len = (24 + desc_len); |
| 4140 | |
| 4141 | off += desc_len; |
| 4142 | add_len += add_desc_len; |
| 4143 | } |
| 4144 | spin_unlock(&pr_tmpl->registration_lock); |
| 4145 | /* |
| 4146 | * Set ADDITIONAL_LENGTH |
| 4147 | */ |
| 4148 | buf[4] = ((add_len >> 24) & 0xff); |
| 4149 | buf[5] = ((add_len >> 16) & 0xff); |
| 4150 | buf[6] = ((add_len >> 8) & 0xff); |
| 4151 | buf[7] = (add_len & 0xff); |
| 4152 | |
| 4153 | return 0; |
| 4154 | } |
| 4155 | |
| 4156 | static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb) |
| 4157 | { |
| 4158 | switch (cdb[1] & 0x1f) { |
| 4159 | case PRI_READ_KEYS: |
| 4160 | return core_scsi3_pri_read_keys(cmd); |
| 4161 | case PRI_READ_RESERVATION: |
| 4162 | return core_scsi3_pri_read_reservation(cmd); |
| 4163 | case PRI_REPORT_CAPABILITIES: |
| 4164 | return core_scsi3_pri_report_capabilities(cmd); |
| 4165 | case PRI_READ_FULL_STATUS: |
| 4166 | return core_scsi3_pri_read_full_status(cmd); |
| 4167 | default: |
| 4168 | printk(KERN_ERR "Unknown PERSISTENT_RESERVE_IN service" |
| 4169 | " action: 0x%02x\n", cdb[1] & 0x1f); |
| 4170 | return PYX_TRANSPORT_INVALID_CDB_FIELD; |
| 4171 | } |
| 4172 | |
| 4173 | } |
| 4174 | |
| 4175 | int core_scsi3_emulate_pr(struct se_cmd *cmd) |
| 4176 | { |
| 4177 | unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0]; |
| 4178 | struct se_device *dev = cmd->se_dev; |
| 4179 | /* |
| 4180 | * Following spc2r20 5.5.1 Reservations overview: |
| 4181 | * |
| 4182 | * If a logical unit has been reserved by any RESERVE command and is |
| 4183 | * still reserved by any initiator, all PERSISTENT RESERVE IN and all |
| 4184 | * PERSISTENT RESERVE OUT commands shall conflict regardless of |
| 4185 | * initiator or service action and shall terminate with a RESERVATION |
| 4186 | * CONFLICT status. |
| 4187 | */ |
| 4188 | if (dev->dev_flags & DF_SPC2_RESERVATIONS) { |
| 4189 | printk(KERN_ERR "Received PERSISTENT_RESERVE CDB while legacy" |
| 4190 | " SPC-2 reservation is held, returning" |
| 4191 | " RESERVATION_CONFLICT\n"); |
| 4192 | return PYX_TRANSPORT_RESERVATION_CONFLICT; |
| 4193 | } |
| 4194 | |
| 4195 | return (cdb[0] == PERSISTENT_RESERVE_OUT) ? |
| 4196 | core_scsi3_emulate_pr_out(cmd, cdb) : |
| 4197 | core_scsi3_emulate_pr_in(cmd, cdb); |
| 4198 | } |
| 4199 | |
| 4200 | static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) |
| 4201 | { |
| 4202 | return 0; |
| 4203 | } |
| 4204 | |
| 4205 | static int core_pt_seq_non_holder( |
| 4206 | struct se_cmd *cmd, |
| 4207 | unsigned char *cdb, |
| 4208 | u32 pr_reg_type) |
| 4209 | { |
| 4210 | return 0; |
| 4211 | } |
| 4212 | |
| 4213 | int core_setup_reservations(struct se_device *dev, int force_pt) |
| 4214 | { |
| 4215 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| 4216 | struct t10_reservation_template *rest = &su_dev->t10_reservation; |
| 4217 | /* |
| 4218 | * If this device is from Target_Core_Mod/pSCSI, use the reservations |
| 4219 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can |
| 4220 | * cause a problem because libata and some SATA RAID HBAs appear |
| 4221 | * under Linux/SCSI, but to emulate reservations themselves. |
| 4222 | */ |
| 4223 | if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
| 4224 | !(DEV_ATTRIB(dev)->emulate_reservations)) || force_pt) { |
| 4225 | rest->res_type = SPC_PASSTHROUGH; |
| 4226 | rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; |
| 4227 | rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; |
| 4228 | printk(KERN_INFO "%s: Using SPC_PASSTHROUGH, no reservation" |
| 4229 | " emulation\n", TRANSPORT(dev)->name); |
| 4230 | return 0; |
| 4231 | } |
| 4232 | /* |
| 4233 | * If SPC-3 or above is reported by real or emulated struct se_device, |
| 4234 | * use emulated Persistent Reservations. |
| 4235 | */ |
| 4236 | if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) { |
| 4237 | rest->res_type = SPC3_PERSISTENT_RESERVATIONS; |
| 4238 | rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; |
| 4239 | rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; |
| 4240 | printk(KERN_INFO "%s: Using SPC3_PERSISTENT_RESERVATIONS" |
| 4241 | " emulation\n", TRANSPORT(dev)->name); |
| 4242 | } else { |
| 4243 | rest->res_type = SPC2_RESERVATIONS; |
| 4244 | rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; |
| 4245 | rest->pr_ops.t10_seq_non_holder = |
| 4246 | &core_scsi2_reservation_seq_non_holder; |
| 4247 | printk(KERN_INFO "%s: Using SPC2_RESERVATIONS emulation\n", |
| 4248 | TRANSPORT(dev)->name); |
| 4249 | } |
| 4250 | |
| 4251 | return 0; |
| 4252 | } |