| 1 | /******************************************************************************* |
| 2 | * Filename: target_core_tpg.c |
| 3 | * |
| 4 | * This file contains generic Target Portal Group related functions. |
| 5 | * |
| 6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. |
| 7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 8 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 9 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 10 | * |
| 11 | * Nicholas A. Bellinger <nab@kernel.org> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 26 | * |
| 27 | ******************************************************************************/ |
| 28 | |
| 29 | #include <linux/net.h> |
| 30 | #include <linux/string.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/in.h> |
| 35 | #include <linux/export.h> |
| 36 | #include <net/sock.h> |
| 37 | #include <net/tcp.h> |
| 38 | #include <scsi/scsi.h> |
| 39 | #include <scsi/scsi_cmnd.h> |
| 40 | |
| 41 | #include <target/target_core_base.h> |
| 42 | #include <target/target_core_backend.h> |
| 43 | #include <target/target_core_fabric.h> |
| 44 | |
| 45 | #include "target_core_internal.h" |
| 46 | |
| 47 | extern struct se_device *g_lun0_dev; |
| 48 | |
| 49 | static DEFINE_SPINLOCK(tpg_lock); |
| 50 | static LIST_HEAD(tpg_list); |
| 51 | |
| 52 | /* core_clear_initiator_node_from_tpg(): |
| 53 | * |
| 54 | * |
| 55 | */ |
| 56 | static void core_clear_initiator_node_from_tpg( |
| 57 | struct se_node_acl *nacl, |
| 58 | struct se_portal_group *tpg) |
| 59 | { |
| 60 | int i; |
| 61 | struct se_dev_entry *deve; |
| 62 | struct se_lun *lun; |
| 63 | |
| 64 | spin_lock_irq(&nacl->device_list_lock); |
| 65 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| 66 | deve = nacl->device_list[i]; |
| 67 | |
| 68 | if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)) |
| 69 | continue; |
| 70 | |
| 71 | if (!deve->se_lun) { |
| 72 | pr_err("%s device entries device pointer is" |
| 73 | " NULL, but Initiator has access.\n", |
| 74 | tpg->se_tpg_tfo->get_fabric_name()); |
| 75 | continue; |
| 76 | } |
| 77 | |
| 78 | lun = deve->se_lun; |
| 79 | spin_unlock_irq(&nacl->device_list_lock); |
| 80 | core_disable_device_list_for_node(lun, NULL, deve->mapped_lun, |
| 81 | TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg); |
| 82 | |
| 83 | spin_lock_irq(&nacl->device_list_lock); |
| 84 | } |
| 85 | spin_unlock_irq(&nacl->device_list_lock); |
| 86 | } |
| 87 | |
| 88 | /* __core_tpg_get_initiator_node_acl(): |
| 89 | * |
| 90 | * spin_lock_bh(&tpg->acl_node_lock); must be held when calling |
| 91 | */ |
| 92 | struct se_node_acl *__core_tpg_get_initiator_node_acl( |
| 93 | struct se_portal_group *tpg, |
| 94 | const char *initiatorname) |
| 95 | { |
| 96 | struct se_node_acl *acl; |
| 97 | |
| 98 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { |
| 99 | if (!strcmp(acl->initiatorname, initiatorname)) |
| 100 | return acl; |
| 101 | } |
| 102 | |
| 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | /* core_tpg_get_initiator_node_acl(): |
| 107 | * |
| 108 | * |
| 109 | */ |
| 110 | struct se_node_acl *core_tpg_get_initiator_node_acl( |
| 111 | struct se_portal_group *tpg, |
| 112 | unsigned char *initiatorname) |
| 113 | { |
| 114 | struct se_node_acl *acl; |
| 115 | |
| 116 | spin_lock_irq(&tpg->acl_node_lock); |
| 117 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { |
| 118 | if (!strcmp(acl->initiatorname, initiatorname) && |
| 119 | !acl->dynamic_node_acl) { |
| 120 | spin_unlock_irq(&tpg->acl_node_lock); |
| 121 | return acl; |
| 122 | } |
| 123 | } |
| 124 | spin_unlock_irq(&tpg->acl_node_lock); |
| 125 | |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | /* core_tpg_add_node_to_devs(): |
| 130 | * |
| 131 | * |
| 132 | */ |
| 133 | void core_tpg_add_node_to_devs( |
| 134 | struct se_node_acl *acl, |
| 135 | struct se_portal_group *tpg) |
| 136 | { |
| 137 | int i = 0; |
| 138 | u32 lun_access = 0; |
| 139 | struct se_lun *lun; |
| 140 | struct se_device *dev; |
| 141 | |
| 142 | spin_lock(&tpg->tpg_lun_lock); |
| 143 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| 144 | lun = tpg->tpg_lun_list[i]; |
| 145 | if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) |
| 146 | continue; |
| 147 | |
| 148 | spin_unlock(&tpg->tpg_lun_lock); |
| 149 | |
| 150 | dev = lun->lun_se_dev; |
| 151 | /* |
| 152 | * By default in LIO-Target $FABRIC_MOD, |
| 153 | * demo_mode_write_protect is ON, or READ_ONLY; |
| 154 | */ |
| 155 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { |
| 156 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
| 157 | } else { |
| 158 | /* |
| 159 | * Allow only optical drives to issue R/W in default RO |
| 160 | * demo mode. |
| 161 | */ |
| 162 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
| 163 | lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; |
| 164 | else |
| 165 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
| 166 | } |
| 167 | |
| 168 | pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s" |
| 169 | " access for LUN in Demo Mode\n", |
| 170 | tpg->se_tpg_tfo->get_fabric_name(), |
| 171 | tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, |
| 172 | (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? |
| 173 | "READ-WRITE" : "READ-ONLY"); |
| 174 | |
| 175 | core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, |
| 176 | lun_access, acl, tpg); |
| 177 | spin_lock(&tpg->tpg_lun_lock); |
| 178 | } |
| 179 | spin_unlock(&tpg->tpg_lun_lock); |
| 180 | } |
| 181 | |
| 182 | /* core_set_queue_depth_for_node(): |
| 183 | * |
| 184 | * |
| 185 | */ |
| 186 | static int core_set_queue_depth_for_node( |
| 187 | struct se_portal_group *tpg, |
| 188 | struct se_node_acl *acl) |
| 189 | { |
| 190 | if (!acl->queue_depth) { |
| 191 | pr_err("Queue depth for %s Initiator Node: %s is 0," |
| 192 | "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 193 | acl->initiatorname); |
| 194 | acl->queue_depth = 1; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | void array_free(void *array, int n) |
| 201 | { |
| 202 | void **a = array; |
| 203 | int i; |
| 204 | |
| 205 | for (i = 0; i < n; i++) |
| 206 | kfree(a[i]); |
| 207 | kfree(a); |
| 208 | } |
| 209 | |
| 210 | static void *array_zalloc(int n, size_t size, gfp_t flags) |
| 211 | { |
| 212 | void **a; |
| 213 | int i; |
| 214 | |
| 215 | a = kzalloc(n * sizeof(void*), flags); |
| 216 | if (!a) |
| 217 | return NULL; |
| 218 | for (i = 0; i < n; i++) { |
| 219 | a[i] = kzalloc(size, flags); |
| 220 | if (!a[i]) { |
| 221 | array_free(a, n); |
| 222 | return NULL; |
| 223 | } |
| 224 | } |
| 225 | return a; |
| 226 | } |
| 227 | |
| 228 | /* core_create_device_list_for_node(): |
| 229 | * |
| 230 | * |
| 231 | */ |
| 232 | static int core_create_device_list_for_node(struct se_node_acl *nacl) |
| 233 | { |
| 234 | struct se_dev_entry *deve; |
| 235 | int i; |
| 236 | |
| 237 | nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, |
| 238 | sizeof(struct se_dev_entry), GFP_KERNEL); |
| 239 | if (!nacl->device_list) { |
| 240 | pr_err("Unable to allocate memory for" |
| 241 | " struct se_node_acl->device_list\n"); |
| 242 | return -ENOMEM; |
| 243 | } |
| 244 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| 245 | deve = nacl->device_list[i]; |
| 246 | |
| 247 | atomic_set(&deve->ua_count, 0); |
| 248 | atomic_set(&deve->pr_ref_count, 0); |
| 249 | spin_lock_init(&deve->ua_lock); |
| 250 | INIT_LIST_HEAD(&deve->alua_port_list); |
| 251 | INIT_LIST_HEAD(&deve->ua_list); |
| 252 | } |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | /* core_tpg_check_initiator_node_acl() |
| 258 | * |
| 259 | * |
| 260 | */ |
| 261 | struct se_node_acl *core_tpg_check_initiator_node_acl( |
| 262 | struct se_portal_group *tpg, |
| 263 | unsigned char *initiatorname) |
| 264 | { |
| 265 | struct se_node_acl *acl; |
| 266 | |
| 267 | acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 268 | if (acl) |
| 269 | return acl; |
| 270 | |
| 271 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) |
| 272 | return NULL; |
| 273 | |
| 274 | acl = tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg); |
| 275 | if (!acl) |
| 276 | return NULL; |
| 277 | |
| 278 | INIT_LIST_HEAD(&acl->acl_list); |
| 279 | INIT_LIST_HEAD(&acl->acl_sess_list); |
| 280 | kref_init(&acl->acl_kref); |
| 281 | init_completion(&acl->acl_free_comp); |
| 282 | spin_lock_init(&acl->device_list_lock); |
| 283 | spin_lock_init(&acl->nacl_sess_lock); |
| 284 | atomic_set(&acl->acl_pr_ref_count, 0); |
| 285 | acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); |
| 286 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); |
| 287 | acl->se_tpg = tpg; |
| 288 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); |
| 289 | spin_lock_init(&acl->stats_lock); |
| 290 | acl->dynamic_node_acl = 1; |
| 291 | |
| 292 | tpg->se_tpg_tfo->set_default_node_attributes(acl); |
| 293 | |
| 294 | if (core_create_device_list_for_node(acl) < 0) { |
| 295 | tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| 300 | core_free_device_list_for_node(acl, tpg); |
| 301 | tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| 302 | return NULL; |
| 303 | } |
| 304 | /* |
| 305 | * Here we only create demo-mode MappedLUNs from the active |
| 306 | * TPG LUNs if the fabric is not explictly asking for |
| 307 | * tpg_check_demo_mode_login_only() == 1. |
| 308 | */ |
| 309 | if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || |
| 310 | (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) |
| 311 | core_tpg_add_node_to_devs(acl, tpg); |
| 312 | |
| 313 | spin_lock_irq(&tpg->acl_node_lock); |
| 314 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
| 315 | tpg->num_node_acls++; |
| 316 | spin_unlock_irq(&tpg->acl_node_lock); |
| 317 | |
| 318 | pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s" |
| 319 | " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 320 | tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, |
| 321 | tpg->se_tpg_tfo->get_fabric_name(), initiatorname); |
| 322 | |
| 323 | return acl; |
| 324 | } |
| 325 | EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); |
| 326 | |
| 327 | void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) |
| 328 | { |
| 329 | while (atomic_read(&nacl->acl_pr_ref_count) != 0) |
| 330 | cpu_relax(); |
| 331 | } |
| 332 | |
| 333 | void core_tpg_clear_object_luns(struct se_portal_group *tpg) |
| 334 | { |
| 335 | int i; |
| 336 | struct se_lun *lun; |
| 337 | |
| 338 | spin_lock(&tpg->tpg_lun_lock); |
| 339 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| 340 | lun = tpg->tpg_lun_list[i]; |
| 341 | |
| 342 | if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) || |
| 343 | (lun->lun_se_dev == NULL)) |
| 344 | continue; |
| 345 | |
| 346 | spin_unlock(&tpg->tpg_lun_lock); |
| 347 | core_dev_del_lun(tpg, lun->unpacked_lun); |
| 348 | spin_lock(&tpg->tpg_lun_lock); |
| 349 | } |
| 350 | spin_unlock(&tpg->tpg_lun_lock); |
| 351 | } |
| 352 | EXPORT_SYMBOL(core_tpg_clear_object_luns); |
| 353 | |
| 354 | /* core_tpg_add_initiator_node_acl(): |
| 355 | * |
| 356 | * |
| 357 | */ |
| 358 | struct se_node_acl *core_tpg_add_initiator_node_acl( |
| 359 | struct se_portal_group *tpg, |
| 360 | struct se_node_acl *se_nacl, |
| 361 | const char *initiatorname, |
| 362 | u32 queue_depth) |
| 363 | { |
| 364 | struct se_node_acl *acl = NULL; |
| 365 | |
| 366 | spin_lock_irq(&tpg->acl_node_lock); |
| 367 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 368 | if (acl) { |
| 369 | if (acl->dynamic_node_acl) { |
| 370 | acl->dynamic_node_acl = 0; |
| 371 | pr_debug("%s_TPG[%u] - Replacing dynamic ACL" |
| 372 | " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 373 | tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); |
| 374 | spin_unlock_irq(&tpg->acl_node_lock); |
| 375 | /* |
| 376 | * Release the locally allocated struct se_node_acl |
| 377 | * because * core_tpg_add_initiator_node_acl() returned |
| 378 | * a pointer to an existing demo mode node ACL. |
| 379 | */ |
| 380 | if (se_nacl) |
| 381 | tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, |
| 382 | se_nacl); |
| 383 | goto done; |
| 384 | } |
| 385 | |
| 386 | pr_err("ACL entry for %s Initiator" |
| 387 | " Node %s already exists for TPG %u, ignoring" |
| 388 | " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 389 | initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 390 | spin_unlock_irq(&tpg->acl_node_lock); |
| 391 | return ERR_PTR(-EEXIST); |
| 392 | } |
| 393 | spin_unlock_irq(&tpg->acl_node_lock); |
| 394 | |
| 395 | if (!se_nacl) { |
| 396 | pr_err("struct se_node_acl pointer is NULL\n"); |
| 397 | return ERR_PTR(-EINVAL); |
| 398 | } |
| 399 | /* |
| 400 | * For v4.x logic the se_node_acl_s is hanging off a fabric |
| 401 | * dependent structure allocated via |
| 402 | * struct target_core_fabric_ops->fabric_make_nodeacl() |
| 403 | */ |
| 404 | acl = se_nacl; |
| 405 | |
| 406 | INIT_LIST_HEAD(&acl->acl_list); |
| 407 | INIT_LIST_HEAD(&acl->acl_sess_list); |
| 408 | kref_init(&acl->acl_kref); |
| 409 | init_completion(&acl->acl_free_comp); |
| 410 | spin_lock_init(&acl->device_list_lock); |
| 411 | spin_lock_init(&acl->nacl_sess_lock); |
| 412 | atomic_set(&acl->acl_pr_ref_count, 0); |
| 413 | acl->queue_depth = queue_depth; |
| 414 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); |
| 415 | acl->se_tpg = tpg; |
| 416 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); |
| 417 | spin_lock_init(&acl->stats_lock); |
| 418 | |
| 419 | tpg->se_tpg_tfo->set_default_node_attributes(acl); |
| 420 | |
| 421 | if (core_create_device_list_for_node(acl) < 0) { |
| 422 | tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| 423 | return ERR_PTR(-ENOMEM); |
| 424 | } |
| 425 | |
| 426 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| 427 | core_free_device_list_for_node(acl, tpg); |
| 428 | tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| 429 | return ERR_PTR(-EINVAL); |
| 430 | } |
| 431 | |
| 432 | spin_lock_irq(&tpg->acl_node_lock); |
| 433 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
| 434 | tpg->num_node_acls++; |
| 435 | spin_unlock_irq(&tpg->acl_node_lock); |
| 436 | |
| 437 | done: |
| 438 | pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s" |
| 439 | " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 440 | tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, |
| 441 | tpg->se_tpg_tfo->get_fabric_name(), initiatorname); |
| 442 | |
| 443 | return acl; |
| 444 | } |
| 445 | EXPORT_SYMBOL(core_tpg_add_initiator_node_acl); |
| 446 | |
| 447 | /* core_tpg_del_initiator_node_acl(): |
| 448 | * |
| 449 | * |
| 450 | */ |
| 451 | int core_tpg_del_initiator_node_acl( |
| 452 | struct se_portal_group *tpg, |
| 453 | struct se_node_acl *acl, |
| 454 | int force) |
| 455 | { |
| 456 | LIST_HEAD(sess_list); |
| 457 | struct se_session *sess, *sess_tmp; |
| 458 | unsigned long flags; |
| 459 | int rc; |
| 460 | |
| 461 | spin_lock_irq(&tpg->acl_node_lock); |
| 462 | if (acl->dynamic_node_acl) { |
| 463 | acl->dynamic_node_acl = 0; |
| 464 | } |
| 465 | list_del(&acl->acl_list); |
| 466 | tpg->num_node_acls--; |
| 467 | spin_unlock_irq(&tpg->acl_node_lock); |
| 468 | |
| 469 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); |
| 470 | acl->acl_stop = 1; |
| 471 | |
| 472 | list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, |
| 473 | sess_acl_list) { |
| 474 | if (sess->sess_tearing_down != 0) |
| 475 | continue; |
| 476 | |
| 477 | target_get_session(sess); |
| 478 | list_move(&sess->sess_acl_list, &sess_list); |
| 479 | } |
| 480 | spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); |
| 481 | |
| 482 | list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) { |
| 483 | list_del(&sess->sess_acl_list); |
| 484 | |
| 485 | rc = tpg->se_tpg_tfo->shutdown_session(sess); |
| 486 | target_put_session(sess); |
| 487 | if (!rc) |
| 488 | continue; |
| 489 | target_put_session(sess); |
| 490 | } |
| 491 | target_put_nacl(acl); |
| 492 | /* |
| 493 | * Wait for last target_put_nacl() to complete in target_complete_nacl() |
| 494 | * for active fabric session transport_deregister_session() callbacks. |
| 495 | */ |
| 496 | wait_for_completion(&acl->acl_free_comp); |
| 497 | |
| 498 | core_tpg_wait_for_nacl_pr_ref(acl); |
| 499 | core_clear_initiator_node_from_tpg(acl, tpg); |
| 500 | core_free_device_list_for_node(acl, tpg); |
| 501 | |
| 502 | pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" |
| 503 | " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 504 | tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, |
| 505 | tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | EXPORT_SYMBOL(core_tpg_del_initiator_node_acl); |
| 510 | |
| 511 | /* core_tpg_set_initiator_node_queue_depth(): |
| 512 | * |
| 513 | * |
| 514 | */ |
| 515 | int core_tpg_set_initiator_node_queue_depth( |
| 516 | struct se_portal_group *tpg, |
| 517 | unsigned char *initiatorname, |
| 518 | u32 queue_depth, |
| 519 | int force) |
| 520 | { |
| 521 | struct se_session *sess, *init_sess = NULL; |
| 522 | struct se_node_acl *acl; |
| 523 | unsigned long flags; |
| 524 | int dynamic_acl = 0; |
| 525 | |
| 526 | spin_lock_irq(&tpg->acl_node_lock); |
| 527 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 528 | if (!acl) { |
| 529 | pr_err("Access Control List entry for %s Initiator" |
| 530 | " Node %s does not exists for TPG %hu, ignoring" |
| 531 | " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 532 | initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 533 | spin_unlock_irq(&tpg->acl_node_lock); |
| 534 | return -ENODEV; |
| 535 | } |
| 536 | if (acl->dynamic_node_acl) { |
| 537 | acl->dynamic_node_acl = 0; |
| 538 | dynamic_acl = 1; |
| 539 | } |
| 540 | spin_unlock_irq(&tpg->acl_node_lock); |
| 541 | |
| 542 | spin_lock_irqsave(&tpg->session_lock, flags); |
| 543 | list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { |
| 544 | if (sess->se_node_acl != acl) |
| 545 | continue; |
| 546 | |
| 547 | if (!force) { |
| 548 | pr_err("Unable to change queue depth for %s" |
| 549 | " Initiator Node: %s while session is" |
| 550 | " operational. To forcefully change the queue" |
| 551 | " depth and force session reinstatement" |
| 552 | " use the \"force=1\" parameter.\n", |
| 553 | tpg->se_tpg_tfo->get_fabric_name(), initiatorname); |
| 554 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 555 | |
| 556 | spin_lock_irq(&tpg->acl_node_lock); |
| 557 | if (dynamic_acl) |
| 558 | acl->dynamic_node_acl = 1; |
| 559 | spin_unlock_irq(&tpg->acl_node_lock); |
| 560 | return -EEXIST; |
| 561 | } |
| 562 | /* |
| 563 | * Determine if the session needs to be closed by our context. |
| 564 | */ |
| 565 | if (!tpg->se_tpg_tfo->shutdown_session(sess)) |
| 566 | continue; |
| 567 | |
| 568 | init_sess = sess; |
| 569 | break; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * User has requested to change the queue depth for a Initiator Node. |
| 574 | * Change the value in the Node's struct se_node_acl, and call |
| 575 | * core_set_queue_depth_for_node() to add the requested queue depth. |
| 576 | * |
| 577 | * Finally call tpg->se_tpg_tfo->close_session() to force session |
| 578 | * reinstatement to occur if there is an active session for the |
| 579 | * $FABRIC_MOD Initiator Node in question. |
| 580 | */ |
| 581 | acl->queue_depth = queue_depth; |
| 582 | |
| 583 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| 584 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 585 | /* |
| 586 | * Force session reinstatement if |
| 587 | * core_set_queue_depth_for_node() failed, because we assume |
| 588 | * the $FABRIC_MOD has already the set session reinstatement |
| 589 | * bit from tpg->se_tpg_tfo->shutdown_session() called above. |
| 590 | */ |
| 591 | if (init_sess) |
| 592 | tpg->se_tpg_tfo->close_session(init_sess); |
| 593 | |
| 594 | spin_lock_irq(&tpg->acl_node_lock); |
| 595 | if (dynamic_acl) |
| 596 | acl->dynamic_node_acl = 1; |
| 597 | spin_unlock_irq(&tpg->acl_node_lock); |
| 598 | return -EINVAL; |
| 599 | } |
| 600 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 601 | /* |
| 602 | * If the $FABRIC_MOD session for the Initiator Node ACL exists, |
| 603 | * forcefully shutdown the $FABRIC_MOD session/nexus. |
| 604 | */ |
| 605 | if (init_sess) |
| 606 | tpg->se_tpg_tfo->close_session(init_sess); |
| 607 | |
| 608 | pr_debug("Successfully changed queue depth to: %d for Initiator" |
| 609 | " Node: %s on %s Target Portal Group: %u\n", queue_depth, |
| 610 | initiatorname, tpg->se_tpg_tfo->get_fabric_name(), |
| 611 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 612 | |
| 613 | spin_lock_irq(&tpg->acl_node_lock); |
| 614 | if (dynamic_acl) |
| 615 | acl->dynamic_node_acl = 1; |
| 616 | spin_unlock_irq(&tpg->acl_node_lock); |
| 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); |
| 621 | |
| 622 | static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg) |
| 623 | { |
| 624 | /* Set in core_dev_setup_virtual_lun0() */ |
| 625 | struct se_device *dev = g_lun0_dev; |
| 626 | struct se_lun *lun = &se_tpg->tpg_virt_lun0; |
| 627 | u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; |
| 628 | int ret; |
| 629 | |
| 630 | lun->unpacked_lun = 0; |
| 631 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| 632 | atomic_set(&lun->lun_acl_count, 0); |
| 633 | init_completion(&lun->lun_shutdown_comp); |
| 634 | INIT_LIST_HEAD(&lun->lun_acl_list); |
| 635 | INIT_LIST_HEAD(&lun->lun_cmd_list); |
| 636 | spin_lock_init(&lun->lun_acl_lock); |
| 637 | spin_lock_init(&lun->lun_cmd_lock); |
| 638 | spin_lock_init(&lun->lun_sep_lock); |
| 639 | |
| 640 | ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev); |
| 641 | if (ret < 0) |
| 642 | return ret; |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg) |
| 648 | { |
| 649 | struct se_lun *lun = &se_tpg->tpg_virt_lun0; |
| 650 | |
| 651 | core_tpg_post_dellun(se_tpg, lun); |
| 652 | } |
| 653 | |
| 654 | int core_tpg_register( |
| 655 | struct target_core_fabric_ops *tfo, |
| 656 | struct se_wwn *se_wwn, |
| 657 | struct se_portal_group *se_tpg, |
| 658 | void *tpg_fabric_ptr, |
| 659 | int se_tpg_type) |
| 660 | { |
| 661 | struct se_lun *lun; |
| 662 | u32 i; |
| 663 | |
| 664 | se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, |
| 665 | sizeof(struct se_lun), GFP_KERNEL); |
| 666 | if (!se_tpg->tpg_lun_list) { |
| 667 | pr_err("Unable to allocate struct se_portal_group->" |
| 668 | "tpg_lun_list\n"); |
| 669 | return -ENOMEM; |
| 670 | } |
| 671 | |
| 672 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| 673 | lun = se_tpg->tpg_lun_list[i]; |
| 674 | lun->unpacked_lun = i; |
| 675 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| 676 | atomic_set(&lun->lun_acl_count, 0); |
| 677 | init_completion(&lun->lun_shutdown_comp); |
| 678 | INIT_LIST_HEAD(&lun->lun_acl_list); |
| 679 | INIT_LIST_HEAD(&lun->lun_cmd_list); |
| 680 | spin_lock_init(&lun->lun_acl_lock); |
| 681 | spin_lock_init(&lun->lun_cmd_lock); |
| 682 | spin_lock_init(&lun->lun_sep_lock); |
| 683 | } |
| 684 | |
| 685 | se_tpg->se_tpg_type = se_tpg_type; |
| 686 | se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr; |
| 687 | se_tpg->se_tpg_tfo = tfo; |
| 688 | se_tpg->se_tpg_wwn = se_wwn; |
| 689 | atomic_set(&se_tpg->tpg_pr_ref_count, 0); |
| 690 | INIT_LIST_HEAD(&se_tpg->acl_node_list); |
| 691 | INIT_LIST_HEAD(&se_tpg->se_tpg_node); |
| 692 | INIT_LIST_HEAD(&se_tpg->tpg_sess_list); |
| 693 | spin_lock_init(&se_tpg->acl_node_lock); |
| 694 | spin_lock_init(&se_tpg->session_lock); |
| 695 | spin_lock_init(&se_tpg->tpg_lun_lock); |
| 696 | |
| 697 | if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) { |
| 698 | if (core_tpg_setup_virtual_lun0(se_tpg) < 0) { |
| 699 | kfree(se_tpg); |
| 700 | return -ENOMEM; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | spin_lock_bh(&tpg_lock); |
| 705 | list_add_tail(&se_tpg->se_tpg_node, &tpg_list); |
| 706 | spin_unlock_bh(&tpg_lock); |
| 707 | |
| 708 | pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for" |
| 709 | " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(), |
| 710 | (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? |
| 711 | "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ? |
| 712 | "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg)); |
| 713 | |
| 714 | return 0; |
| 715 | } |
| 716 | EXPORT_SYMBOL(core_tpg_register); |
| 717 | |
| 718 | int core_tpg_deregister(struct se_portal_group *se_tpg) |
| 719 | { |
| 720 | struct se_node_acl *nacl, *nacl_tmp; |
| 721 | |
| 722 | pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group" |
| 723 | " for endpoint: %s Portal Tag %u\n", |
| 724 | (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? |
| 725 | "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(), |
| 726 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), |
| 727 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
| 728 | |
| 729 | spin_lock_bh(&tpg_lock); |
| 730 | list_del(&se_tpg->se_tpg_node); |
| 731 | spin_unlock_bh(&tpg_lock); |
| 732 | |
| 733 | while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) |
| 734 | cpu_relax(); |
| 735 | /* |
| 736 | * Release any remaining demo-mode generated se_node_acl that have |
| 737 | * not been released because of TFO->tpg_check_demo_mode_cache() == 1 |
| 738 | * in transport_deregister_session(). |
| 739 | */ |
| 740 | spin_lock_irq(&se_tpg->acl_node_lock); |
| 741 | list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list, |
| 742 | acl_list) { |
| 743 | list_del(&nacl->acl_list); |
| 744 | se_tpg->num_node_acls--; |
| 745 | spin_unlock_irq(&se_tpg->acl_node_lock); |
| 746 | |
| 747 | core_tpg_wait_for_nacl_pr_ref(nacl); |
| 748 | core_free_device_list_for_node(nacl, se_tpg); |
| 749 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl); |
| 750 | |
| 751 | spin_lock_irq(&se_tpg->acl_node_lock); |
| 752 | } |
| 753 | spin_unlock_irq(&se_tpg->acl_node_lock); |
| 754 | |
| 755 | if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) |
| 756 | core_tpg_release_virtual_lun0(se_tpg); |
| 757 | |
| 758 | se_tpg->se_tpg_fabric_ptr = NULL; |
| 759 | array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG); |
| 760 | return 0; |
| 761 | } |
| 762 | EXPORT_SYMBOL(core_tpg_deregister); |
| 763 | |
| 764 | struct se_lun *core_tpg_pre_addlun( |
| 765 | struct se_portal_group *tpg, |
| 766 | u32 unpacked_lun) |
| 767 | { |
| 768 | struct se_lun *lun; |
| 769 | |
| 770 | if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { |
| 771 | pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" |
| 772 | "-1: %u for Target Portal Group: %u\n", |
| 773 | tpg->se_tpg_tfo->get_fabric_name(), |
| 774 | unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1, |
| 775 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 776 | return ERR_PTR(-EOVERFLOW); |
| 777 | } |
| 778 | |
| 779 | spin_lock(&tpg->tpg_lun_lock); |
| 780 | lun = tpg->tpg_lun_list[unpacked_lun]; |
| 781 | if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) { |
| 782 | pr_err("TPG Logical Unit Number: %u is already active" |
| 783 | " on %s Target Portal Group: %u, ignoring request.\n", |
| 784 | unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(), |
| 785 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 786 | spin_unlock(&tpg->tpg_lun_lock); |
| 787 | return ERR_PTR(-EINVAL); |
| 788 | } |
| 789 | spin_unlock(&tpg->tpg_lun_lock); |
| 790 | |
| 791 | return lun; |
| 792 | } |
| 793 | |
| 794 | int core_tpg_post_addlun( |
| 795 | struct se_portal_group *tpg, |
| 796 | struct se_lun *lun, |
| 797 | u32 lun_access, |
| 798 | void *lun_ptr) |
| 799 | { |
| 800 | int ret; |
| 801 | |
| 802 | ret = core_dev_export(lun_ptr, tpg, lun); |
| 803 | if (ret < 0) |
| 804 | return ret; |
| 805 | |
| 806 | spin_lock(&tpg->tpg_lun_lock); |
| 807 | lun->lun_access = lun_access; |
| 808 | lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE; |
| 809 | spin_unlock(&tpg->tpg_lun_lock); |
| 810 | |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | static void core_tpg_shutdown_lun( |
| 815 | struct se_portal_group *tpg, |
| 816 | struct se_lun *lun) |
| 817 | { |
| 818 | core_clear_lun_from_tpg(lun, tpg); |
| 819 | transport_clear_lun_from_sessions(lun); |
| 820 | } |
| 821 | |
| 822 | struct se_lun *core_tpg_pre_dellun( |
| 823 | struct se_portal_group *tpg, |
| 824 | u32 unpacked_lun) |
| 825 | { |
| 826 | struct se_lun *lun; |
| 827 | |
| 828 | if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { |
| 829 | pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" |
| 830 | "-1: %u for Target Portal Group: %u\n", |
| 831 | tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
| 832 | TRANSPORT_MAX_LUNS_PER_TPG-1, |
| 833 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 834 | return ERR_PTR(-EOVERFLOW); |
| 835 | } |
| 836 | |
| 837 | spin_lock(&tpg->tpg_lun_lock); |
| 838 | lun = tpg->tpg_lun_list[unpacked_lun]; |
| 839 | if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) { |
| 840 | pr_err("%s Logical Unit Number: %u is not active on" |
| 841 | " Target Portal Group: %u, ignoring request.\n", |
| 842 | tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
| 843 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 844 | spin_unlock(&tpg->tpg_lun_lock); |
| 845 | return ERR_PTR(-ENODEV); |
| 846 | } |
| 847 | spin_unlock(&tpg->tpg_lun_lock); |
| 848 | |
| 849 | return lun; |
| 850 | } |
| 851 | |
| 852 | int core_tpg_post_dellun( |
| 853 | struct se_portal_group *tpg, |
| 854 | struct se_lun *lun) |
| 855 | { |
| 856 | core_tpg_shutdown_lun(tpg, lun); |
| 857 | |
| 858 | core_dev_unexport(lun->lun_se_dev, tpg, lun); |
| 859 | |
| 860 | spin_lock(&tpg->tpg_lun_lock); |
| 861 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| 862 | spin_unlock(&tpg->tpg_lun_lock); |
| 863 | |
| 864 | return 0; |
| 865 | } |