| 1 | /******************************************************************************* |
| 2 | * Filename: target_core_tpg.c |
| 3 | * |
| 4 | * This file contains generic Target Portal Group related functions. |
| 5 | * |
| 6 | * (c) Copyright 2002-2013 Datera, Inc. |
| 7 | * |
| 8 | * Nicholas A. Bellinger <nab@kernel.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | * |
| 24 | ******************************************************************************/ |
| 25 | |
| 26 | #include <linux/net.h> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/timer.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/in.h> |
| 32 | #include <linux/export.h> |
| 33 | #include <net/sock.h> |
| 34 | #include <net/tcp.h> |
| 35 | #include <scsi/scsi_proto.h> |
| 36 | |
| 37 | #include <target/target_core_base.h> |
| 38 | #include <target/target_core_backend.h> |
| 39 | #include <target/target_core_fabric.h> |
| 40 | |
| 41 | #include "target_core_internal.h" |
| 42 | #include "target_core_alua.h" |
| 43 | #include "target_core_pr.h" |
| 44 | #include "target_core_ua.h" |
| 45 | |
| 46 | extern struct se_device *g_lun0_dev; |
| 47 | |
| 48 | static DEFINE_SPINLOCK(tpg_lock); |
| 49 | static LIST_HEAD(tpg_list); |
| 50 | |
| 51 | /* __core_tpg_get_initiator_node_acl(): |
| 52 | * |
| 53 | * mutex_lock(&tpg->acl_node_mutex); must be held when calling |
| 54 | */ |
| 55 | struct se_node_acl *__core_tpg_get_initiator_node_acl( |
| 56 | struct se_portal_group *tpg, |
| 57 | const char *initiatorname) |
| 58 | { |
| 59 | struct se_node_acl *acl; |
| 60 | |
| 61 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { |
| 62 | if (!strcmp(acl->initiatorname, initiatorname)) |
| 63 | return acl; |
| 64 | } |
| 65 | |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | /* core_tpg_get_initiator_node_acl(): |
| 70 | * |
| 71 | * |
| 72 | */ |
| 73 | struct se_node_acl *core_tpg_get_initiator_node_acl( |
| 74 | struct se_portal_group *tpg, |
| 75 | unsigned char *initiatorname) |
| 76 | { |
| 77 | struct se_node_acl *acl; |
| 78 | |
| 79 | mutex_lock(&tpg->acl_node_mutex); |
| 80 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 81 | mutex_unlock(&tpg->acl_node_mutex); |
| 82 | |
| 83 | return acl; |
| 84 | } |
| 85 | EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); |
| 86 | |
| 87 | void core_allocate_nexus_loss_ua( |
| 88 | struct se_node_acl *nacl) |
| 89 | { |
| 90 | struct se_dev_entry *deve; |
| 91 | |
| 92 | if (!nacl) |
| 93 | return; |
| 94 | |
| 95 | rcu_read_lock(); |
| 96 | hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) |
| 97 | core_scsi3_ua_allocate(deve, 0x29, |
| 98 | ASCQ_29H_NEXUS_LOSS_OCCURRED); |
| 99 | rcu_read_unlock(); |
| 100 | } |
| 101 | EXPORT_SYMBOL(core_allocate_nexus_loss_ua); |
| 102 | |
| 103 | /* core_tpg_add_node_to_devs(): |
| 104 | * |
| 105 | * |
| 106 | */ |
| 107 | void core_tpg_add_node_to_devs( |
| 108 | struct se_node_acl *acl, |
| 109 | struct se_portal_group *tpg, |
| 110 | struct se_lun *lun_orig) |
| 111 | { |
| 112 | u32 lun_access = 0; |
| 113 | struct se_lun *lun; |
| 114 | struct se_device *dev; |
| 115 | |
| 116 | mutex_lock(&tpg->tpg_lun_mutex); |
| 117 | hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) { |
| 118 | if (lun_orig && lun != lun_orig) |
| 119 | continue; |
| 120 | |
| 121 | dev = rcu_dereference_check(lun->lun_se_dev, |
| 122 | lockdep_is_held(&tpg->tpg_lun_mutex)); |
| 123 | /* |
| 124 | * By default in LIO-Target $FABRIC_MOD, |
| 125 | * demo_mode_write_protect is ON, or READ_ONLY; |
| 126 | */ |
| 127 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { |
| 128 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
| 129 | } else { |
| 130 | /* |
| 131 | * Allow only optical drives to issue R/W in default RO |
| 132 | * demo mode. |
| 133 | */ |
| 134 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
| 135 | lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; |
| 136 | else |
| 137 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
| 138 | } |
| 139 | |
| 140 | pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s" |
| 141 | " access for LUN in Demo Mode\n", |
| 142 | tpg->se_tpg_tfo->get_fabric_name(), |
| 143 | tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, |
| 144 | (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? |
| 145 | "READ-WRITE" : "READ-ONLY"); |
| 146 | |
| 147 | core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, |
| 148 | lun_access, acl, tpg); |
| 149 | /* |
| 150 | * Check to see if there are any existing persistent reservation |
| 151 | * APTPL pre-registrations that need to be enabled for this dynamic |
| 152 | * LUN ACL now.. |
| 153 | */ |
| 154 | core_scsi3_check_aptpl_registration(dev, tpg, lun, acl, |
| 155 | lun->unpacked_lun); |
| 156 | } |
| 157 | mutex_unlock(&tpg->tpg_lun_mutex); |
| 158 | } |
| 159 | |
| 160 | /* core_set_queue_depth_for_node(): |
| 161 | * |
| 162 | * |
| 163 | */ |
| 164 | static int core_set_queue_depth_for_node( |
| 165 | struct se_portal_group *tpg, |
| 166 | struct se_node_acl *acl) |
| 167 | { |
| 168 | if (!acl->queue_depth) { |
| 169 | pr_err("Queue depth for %s Initiator Node: %s is 0," |
| 170 | "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 171 | acl->initiatorname); |
| 172 | acl->queue_depth = 1; |
| 173 | } |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg, |
| 179 | const unsigned char *initiatorname) |
| 180 | { |
| 181 | struct se_node_acl *acl; |
| 182 | |
| 183 | acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size), |
| 184 | GFP_KERNEL); |
| 185 | if (!acl) |
| 186 | return NULL; |
| 187 | |
| 188 | INIT_LIST_HEAD(&acl->acl_list); |
| 189 | INIT_LIST_HEAD(&acl->acl_sess_list); |
| 190 | INIT_HLIST_HEAD(&acl->lun_entry_hlist); |
| 191 | kref_init(&acl->acl_kref); |
| 192 | init_completion(&acl->acl_free_comp); |
| 193 | spin_lock_init(&acl->nacl_sess_lock); |
| 194 | mutex_init(&acl->lun_entry_mutex); |
| 195 | atomic_set(&acl->acl_pr_ref_count, 0); |
| 196 | if (tpg->se_tpg_tfo->tpg_get_default_depth) |
| 197 | acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); |
| 198 | else |
| 199 | acl->queue_depth = 1; |
| 200 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); |
| 201 | acl->se_tpg = tpg; |
| 202 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); |
| 203 | |
| 204 | tpg->se_tpg_tfo->set_default_node_attributes(acl); |
| 205 | |
| 206 | if (core_set_queue_depth_for_node(tpg, acl) < 0) |
| 207 | goto out_free_acl; |
| 208 | |
| 209 | return acl; |
| 210 | |
| 211 | out_free_acl: |
| 212 | kfree(acl); |
| 213 | return NULL; |
| 214 | } |
| 215 | |
| 216 | static void target_add_node_acl(struct se_node_acl *acl) |
| 217 | { |
| 218 | struct se_portal_group *tpg = acl->se_tpg; |
| 219 | |
| 220 | mutex_lock(&tpg->acl_node_mutex); |
| 221 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
| 222 | tpg->num_node_acls++; |
| 223 | mutex_unlock(&tpg->acl_node_mutex); |
| 224 | |
| 225 | pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s" |
| 226 | " Initiator Node: %s\n", |
| 227 | tpg->se_tpg_tfo->get_fabric_name(), |
| 228 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
| 229 | acl->dynamic_node_acl ? "DYNAMIC" : "", |
| 230 | acl->queue_depth, |
| 231 | tpg->se_tpg_tfo->get_fabric_name(), |
| 232 | acl->initiatorname); |
| 233 | } |
| 234 | |
| 235 | struct se_node_acl *core_tpg_check_initiator_node_acl( |
| 236 | struct se_portal_group *tpg, |
| 237 | unsigned char *initiatorname) |
| 238 | { |
| 239 | struct se_node_acl *acl; |
| 240 | |
| 241 | acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 242 | if (acl) |
| 243 | return acl; |
| 244 | |
| 245 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) |
| 246 | return NULL; |
| 247 | |
| 248 | acl = target_alloc_node_acl(tpg, initiatorname); |
| 249 | if (!acl) |
| 250 | return NULL; |
| 251 | acl->dynamic_node_acl = 1; |
| 252 | |
| 253 | /* |
| 254 | * Here we only create demo-mode MappedLUNs from the active |
| 255 | * TPG LUNs if the fabric is not explicitly asking for |
| 256 | * tpg_check_demo_mode_login_only() == 1. |
| 257 | */ |
| 258 | if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || |
| 259 | (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) |
| 260 | core_tpg_add_node_to_devs(acl, tpg, NULL); |
| 261 | |
| 262 | target_add_node_acl(acl); |
| 263 | return acl; |
| 264 | } |
| 265 | EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); |
| 266 | |
| 267 | void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) |
| 268 | { |
| 269 | while (atomic_read(&nacl->acl_pr_ref_count) != 0) |
| 270 | cpu_relax(); |
| 271 | } |
| 272 | |
| 273 | struct se_node_acl *core_tpg_add_initiator_node_acl( |
| 274 | struct se_portal_group *tpg, |
| 275 | const char *initiatorname) |
| 276 | { |
| 277 | struct se_node_acl *acl; |
| 278 | |
| 279 | mutex_lock(&tpg->acl_node_mutex); |
| 280 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 281 | if (acl) { |
| 282 | if (acl->dynamic_node_acl) { |
| 283 | acl->dynamic_node_acl = 0; |
| 284 | pr_debug("%s_TPG[%u] - Replacing dynamic ACL" |
| 285 | " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 286 | tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); |
| 287 | mutex_unlock(&tpg->acl_node_mutex); |
| 288 | return acl; |
| 289 | } |
| 290 | |
| 291 | pr_err("ACL entry for %s Initiator" |
| 292 | " Node %s already exists for TPG %u, ignoring" |
| 293 | " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 294 | initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 295 | mutex_unlock(&tpg->acl_node_mutex); |
| 296 | return ERR_PTR(-EEXIST); |
| 297 | } |
| 298 | mutex_unlock(&tpg->acl_node_mutex); |
| 299 | |
| 300 | acl = target_alloc_node_acl(tpg, initiatorname); |
| 301 | if (!acl) |
| 302 | return ERR_PTR(-ENOMEM); |
| 303 | |
| 304 | target_add_node_acl(acl); |
| 305 | return acl; |
| 306 | } |
| 307 | |
| 308 | void core_tpg_del_initiator_node_acl(struct se_node_acl *acl) |
| 309 | { |
| 310 | struct se_portal_group *tpg = acl->se_tpg; |
| 311 | LIST_HEAD(sess_list); |
| 312 | struct se_session *sess, *sess_tmp; |
| 313 | unsigned long flags; |
| 314 | int rc; |
| 315 | |
| 316 | mutex_lock(&tpg->acl_node_mutex); |
| 317 | if (acl->dynamic_node_acl) { |
| 318 | acl->dynamic_node_acl = 0; |
| 319 | } |
| 320 | list_del(&acl->acl_list); |
| 321 | tpg->num_node_acls--; |
| 322 | mutex_unlock(&tpg->acl_node_mutex); |
| 323 | |
| 324 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); |
| 325 | acl->acl_stop = 1; |
| 326 | |
| 327 | list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, |
| 328 | sess_acl_list) { |
| 329 | if (sess->sess_tearing_down != 0) |
| 330 | continue; |
| 331 | |
| 332 | target_get_session(sess); |
| 333 | list_move(&sess->sess_acl_list, &sess_list); |
| 334 | } |
| 335 | spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); |
| 336 | |
| 337 | list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) { |
| 338 | list_del(&sess->sess_acl_list); |
| 339 | |
| 340 | rc = tpg->se_tpg_tfo->shutdown_session(sess); |
| 341 | target_put_session(sess); |
| 342 | if (!rc) |
| 343 | continue; |
| 344 | target_put_session(sess); |
| 345 | } |
| 346 | target_put_nacl(acl); |
| 347 | /* |
| 348 | * Wait for last target_put_nacl() to complete in target_complete_nacl() |
| 349 | * for active fabric session transport_deregister_session() callbacks. |
| 350 | */ |
| 351 | wait_for_completion(&acl->acl_free_comp); |
| 352 | |
| 353 | core_tpg_wait_for_nacl_pr_ref(acl); |
| 354 | core_free_device_list_for_node(acl, tpg); |
| 355 | |
| 356 | pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" |
| 357 | " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 358 | tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, |
| 359 | tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); |
| 360 | |
| 361 | kfree(acl); |
| 362 | } |
| 363 | |
| 364 | /* core_tpg_set_initiator_node_queue_depth(): |
| 365 | * |
| 366 | * |
| 367 | */ |
| 368 | int core_tpg_set_initiator_node_queue_depth( |
| 369 | struct se_portal_group *tpg, |
| 370 | unsigned char *initiatorname, |
| 371 | u32 queue_depth, |
| 372 | int force) |
| 373 | { |
| 374 | struct se_session *sess, *init_sess = NULL; |
| 375 | struct se_node_acl *acl; |
| 376 | unsigned long flags; |
| 377 | int dynamic_acl = 0; |
| 378 | |
| 379 | mutex_lock(&tpg->acl_node_mutex); |
| 380 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| 381 | if (!acl) { |
| 382 | pr_err("Access Control List entry for %s Initiator" |
| 383 | " Node %s does not exists for TPG %hu, ignoring" |
| 384 | " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| 385 | initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 386 | mutex_unlock(&tpg->acl_node_mutex); |
| 387 | return -ENODEV; |
| 388 | } |
| 389 | if (acl->dynamic_node_acl) { |
| 390 | acl->dynamic_node_acl = 0; |
| 391 | dynamic_acl = 1; |
| 392 | } |
| 393 | mutex_unlock(&tpg->acl_node_mutex); |
| 394 | |
| 395 | spin_lock_irqsave(&tpg->session_lock, flags); |
| 396 | list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { |
| 397 | if (sess->se_node_acl != acl) |
| 398 | continue; |
| 399 | |
| 400 | if (!force) { |
| 401 | pr_err("Unable to change queue depth for %s" |
| 402 | " Initiator Node: %s while session is" |
| 403 | " operational. To forcefully change the queue" |
| 404 | " depth and force session reinstatement" |
| 405 | " use the \"force=1\" parameter.\n", |
| 406 | tpg->se_tpg_tfo->get_fabric_name(), initiatorname); |
| 407 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 408 | |
| 409 | mutex_lock(&tpg->acl_node_mutex); |
| 410 | if (dynamic_acl) |
| 411 | acl->dynamic_node_acl = 1; |
| 412 | mutex_unlock(&tpg->acl_node_mutex); |
| 413 | return -EEXIST; |
| 414 | } |
| 415 | /* |
| 416 | * Determine if the session needs to be closed by our context. |
| 417 | */ |
| 418 | if (!tpg->se_tpg_tfo->shutdown_session(sess)) |
| 419 | continue; |
| 420 | |
| 421 | init_sess = sess; |
| 422 | break; |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * User has requested to change the queue depth for a Initiator Node. |
| 427 | * Change the value in the Node's struct se_node_acl, and call |
| 428 | * core_set_queue_depth_for_node() to add the requested queue depth. |
| 429 | * |
| 430 | * Finally call tpg->se_tpg_tfo->close_session() to force session |
| 431 | * reinstatement to occur if there is an active session for the |
| 432 | * $FABRIC_MOD Initiator Node in question. |
| 433 | */ |
| 434 | acl->queue_depth = queue_depth; |
| 435 | |
| 436 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| 437 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 438 | /* |
| 439 | * Force session reinstatement if |
| 440 | * core_set_queue_depth_for_node() failed, because we assume |
| 441 | * the $FABRIC_MOD has already the set session reinstatement |
| 442 | * bit from tpg->se_tpg_tfo->shutdown_session() called above. |
| 443 | */ |
| 444 | if (init_sess) |
| 445 | tpg->se_tpg_tfo->close_session(init_sess); |
| 446 | |
| 447 | mutex_lock(&tpg->acl_node_mutex); |
| 448 | if (dynamic_acl) |
| 449 | acl->dynamic_node_acl = 1; |
| 450 | mutex_unlock(&tpg->acl_node_mutex); |
| 451 | return -EINVAL; |
| 452 | } |
| 453 | spin_unlock_irqrestore(&tpg->session_lock, flags); |
| 454 | /* |
| 455 | * If the $FABRIC_MOD session for the Initiator Node ACL exists, |
| 456 | * forcefully shutdown the $FABRIC_MOD session/nexus. |
| 457 | */ |
| 458 | if (init_sess) |
| 459 | tpg->se_tpg_tfo->close_session(init_sess); |
| 460 | |
| 461 | pr_debug("Successfully changed queue depth to: %d for Initiator" |
| 462 | " Node: %s on %s Target Portal Group: %u\n", queue_depth, |
| 463 | initiatorname, tpg->se_tpg_tfo->get_fabric_name(), |
| 464 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| 465 | |
| 466 | mutex_lock(&tpg->acl_node_mutex); |
| 467 | if (dynamic_acl) |
| 468 | acl->dynamic_node_acl = 1; |
| 469 | mutex_unlock(&tpg->acl_node_mutex); |
| 470 | |
| 471 | return 0; |
| 472 | } |
| 473 | EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); |
| 474 | |
| 475 | /* core_tpg_set_initiator_node_tag(): |
| 476 | * |
| 477 | * Initiator nodeacl tags are not used internally, but may be used by |
| 478 | * userspace to emulate aliases or groups. |
| 479 | * Returns length of newly-set tag or -EINVAL. |
| 480 | */ |
| 481 | int core_tpg_set_initiator_node_tag( |
| 482 | struct se_portal_group *tpg, |
| 483 | struct se_node_acl *acl, |
| 484 | const char *new_tag) |
| 485 | { |
| 486 | if (strlen(new_tag) >= MAX_ACL_TAG_SIZE) |
| 487 | return -EINVAL; |
| 488 | |
| 489 | if (!strncmp("NULL", new_tag, 4)) { |
| 490 | acl->acl_tag[0] = '\0'; |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag); |
| 495 | } |
| 496 | EXPORT_SYMBOL(core_tpg_set_initiator_node_tag); |
| 497 | |
| 498 | static void core_tpg_lun_ref_release(struct percpu_ref *ref) |
| 499 | { |
| 500 | struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); |
| 501 | |
| 502 | complete(&lun->lun_ref_comp); |
| 503 | } |
| 504 | |
| 505 | int core_tpg_register( |
| 506 | struct se_wwn *se_wwn, |
| 507 | struct se_portal_group *se_tpg, |
| 508 | int proto_id) |
| 509 | { |
| 510 | int ret; |
| 511 | |
| 512 | if (!se_tpg) |
| 513 | return -EINVAL; |
| 514 | /* |
| 515 | * For the typical case where core_tpg_register() is called by a |
| 516 | * fabric driver from target_core_fabric_ops->fabric_make_tpg() |
| 517 | * configfs context, use the original tf_ops pointer already saved |
| 518 | * by target-core in target_fabric_make_wwn(). |
| 519 | * |
| 520 | * Otherwise, for special cases like iscsi-target discovery TPGs |
| 521 | * the caller is responsible for setting ->se_tpg_tfo ahead of |
| 522 | * calling core_tpg_register(). |
| 523 | */ |
| 524 | if (se_wwn) |
| 525 | se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops; |
| 526 | |
| 527 | if (!se_tpg->se_tpg_tfo) { |
| 528 | pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n"); |
| 529 | return -EINVAL; |
| 530 | } |
| 531 | |
| 532 | INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist); |
| 533 | se_tpg->proto_id = proto_id; |
| 534 | se_tpg->se_tpg_wwn = se_wwn; |
| 535 | atomic_set(&se_tpg->tpg_pr_ref_count, 0); |
| 536 | INIT_LIST_HEAD(&se_tpg->acl_node_list); |
| 537 | INIT_LIST_HEAD(&se_tpg->se_tpg_node); |
| 538 | INIT_LIST_HEAD(&se_tpg->tpg_sess_list); |
| 539 | spin_lock_init(&se_tpg->session_lock); |
| 540 | mutex_init(&se_tpg->tpg_lun_mutex); |
| 541 | mutex_init(&se_tpg->acl_node_mutex); |
| 542 | |
| 543 | if (se_tpg->proto_id >= 0) { |
| 544 | se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0); |
| 545 | if (IS_ERR(se_tpg->tpg_virt_lun0)) |
| 546 | return PTR_ERR(se_tpg->tpg_virt_lun0); |
| 547 | |
| 548 | ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0, |
| 549 | TRANSPORT_LUNFLAGS_READ_ONLY, g_lun0_dev); |
| 550 | if (ret < 0) { |
| 551 | kfree(se_tpg->tpg_virt_lun0); |
| 552 | return ret; |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | spin_lock_bh(&tpg_lock); |
| 557 | list_add_tail(&se_tpg->se_tpg_node, &tpg_list); |
| 558 | spin_unlock_bh(&tpg_lock); |
| 559 | |
| 560 | pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, " |
| 561 | "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->get_fabric_name(), |
| 562 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ? |
| 563 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL, |
| 564 | se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
| 565 | |
| 566 | return 0; |
| 567 | } |
| 568 | EXPORT_SYMBOL(core_tpg_register); |
| 569 | |
| 570 | int core_tpg_deregister(struct se_portal_group *se_tpg) |
| 571 | { |
| 572 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
| 573 | struct se_node_acl *nacl, *nacl_tmp; |
| 574 | LIST_HEAD(node_list); |
| 575 | |
| 576 | pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, " |
| 577 | "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(), |
| 578 | tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL, |
| 579 | se_tpg->proto_id, tfo->tpg_get_tag(se_tpg)); |
| 580 | |
| 581 | spin_lock_bh(&tpg_lock); |
| 582 | list_del(&se_tpg->se_tpg_node); |
| 583 | spin_unlock_bh(&tpg_lock); |
| 584 | |
| 585 | while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) |
| 586 | cpu_relax(); |
| 587 | |
| 588 | mutex_lock(&se_tpg->acl_node_mutex); |
| 589 | list_splice_init(&se_tpg->acl_node_list, &node_list); |
| 590 | mutex_unlock(&se_tpg->acl_node_mutex); |
| 591 | /* |
| 592 | * Release any remaining demo-mode generated se_node_acl that have |
| 593 | * not been released because of TFO->tpg_check_demo_mode_cache() == 1 |
| 594 | * in transport_deregister_session(). |
| 595 | */ |
| 596 | list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) { |
| 597 | list_del(&nacl->acl_list); |
| 598 | se_tpg->num_node_acls--; |
| 599 | |
| 600 | core_tpg_wait_for_nacl_pr_ref(nacl); |
| 601 | core_free_device_list_for_node(nacl, se_tpg); |
| 602 | kfree(nacl); |
| 603 | } |
| 604 | |
| 605 | if (se_tpg->proto_id >= 0) { |
| 606 | core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0); |
| 607 | kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head); |
| 608 | } |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | EXPORT_SYMBOL(core_tpg_deregister); |
| 613 | |
| 614 | struct se_lun *core_tpg_alloc_lun( |
| 615 | struct se_portal_group *tpg, |
| 616 | u64 unpacked_lun) |
| 617 | { |
| 618 | struct se_lun *lun; |
| 619 | |
| 620 | lun = kzalloc(sizeof(*lun), GFP_KERNEL); |
| 621 | if (!lun) { |
| 622 | pr_err("Unable to allocate se_lun memory\n"); |
| 623 | return ERR_PTR(-ENOMEM); |
| 624 | } |
| 625 | lun->unpacked_lun = unpacked_lun; |
| 626 | lun->lun_link_magic = SE_LUN_LINK_MAGIC; |
| 627 | atomic_set(&lun->lun_acl_count, 0); |
| 628 | init_completion(&lun->lun_ref_comp); |
| 629 | INIT_LIST_HEAD(&lun->lun_deve_list); |
| 630 | INIT_LIST_HEAD(&lun->lun_dev_link); |
| 631 | atomic_set(&lun->lun_tg_pt_secondary_offline, 0); |
| 632 | spin_lock_init(&lun->lun_deve_lock); |
| 633 | mutex_init(&lun->lun_tg_pt_md_mutex); |
| 634 | INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link); |
| 635 | spin_lock_init(&lun->lun_tg_pt_gp_lock); |
| 636 | lun->lun_tpg = tpg; |
| 637 | |
| 638 | return lun; |
| 639 | } |
| 640 | |
| 641 | int core_tpg_add_lun( |
| 642 | struct se_portal_group *tpg, |
| 643 | struct se_lun *lun, |
| 644 | u32 lun_access, |
| 645 | struct se_device *dev) |
| 646 | { |
| 647 | int ret; |
| 648 | |
| 649 | ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0, |
| 650 | GFP_KERNEL); |
| 651 | if (ret < 0) |
| 652 | goto out; |
| 653 | |
| 654 | ret = core_alloc_rtpi(lun, dev); |
| 655 | if (ret) |
| 656 | goto out_kill_ref; |
| 657 | |
| 658 | if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && |
| 659 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) |
| 660 | target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp); |
| 661 | |
| 662 | mutex_lock(&tpg->tpg_lun_mutex); |
| 663 | |
| 664 | spin_lock(&dev->se_port_lock); |
| 665 | lun->lun_index = dev->dev_index; |
| 666 | rcu_assign_pointer(lun->lun_se_dev, dev); |
| 667 | dev->export_count++; |
| 668 | list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list); |
| 669 | spin_unlock(&dev->se_port_lock); |
| 670 | |
| 671 | lun->lun_access = lun_access; |
| 672 | if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) |
| 673 | hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist); |
| 674 | mutex_unlock(&tpg->tpg_lun_mutex); |
| 675 | |
| 676 | return 0; |
| 677 | |
| 678 | out_kill_ref: |
| 679 | percpu_ref_exit(&lun->lun_ref); |
| 680 | out: |
| 681 | return ret; |
| 682 | } |
| 683 | |
| 684 | void core_tpg_remove_lun( |
| 685 | struct se_portal_group *tpg, |
| 686 | struct se_lun *lun) |
| 687 | { |
| 688 | /* |
| 689 | * rcu_dereference_raw protected by se_lun->lun_group symlink |
| 690 | * reference to se_device->dev_group. |
| 691 | */ |
| 692 | struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); |
| 693 | |
| 694 | core_clear_lun_from_tpg(lun, tpg); |
| 695 | /* |
| 696 | * Wait for any active I/O references to percpu se_lun->lun_ref to |
| 697 | * be released. Also, se_lun->lun_ref is now used by PR and ALUA |
| 698 | * logic when referencing a remote target port during ALL_TGT_PT=1 |
| 699 | * and generating UNIT_ATTENTIONs for ALUA access state transition. |
| 700 | */ |
| 701 | transport_clear_lun_ref(lun); |
| 702 | |
| 703 | mutex_lock(&tpg->tpg_lun_mutex); |
| 704 | if (lun->lun_se_dev) { |
| 705 | target_detach_tg_pt_gp(lun); |
| 706 | |
| 707 | spin_lock(&dev->se_port_lock); |
| 708 | list_del(&lun->lun_dev_link); |
| 709 | dev->export_count--; |
| 710 | rcu_assign_pointer(lun->lun_se_dev, NULL); |
| 711 | spin_unlock(&dev->se_port_lock); |
| 712 | } |
| 713 | if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) |
| 714 | hlist_del_rcu(&lun->link); |
| 715 | mutex_unlock(&tpg->tpg_lun_mutex); |
| 716 | |
| 717 | percpu_ref_exit(&lun->lun_ref); |
| 718 | } |