drivers/target/target_core_fabric_configfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3 * Filename: target_core_fabric_configfs.c
   4  *
   5  * This file contains generic fabric module configfs infrastructure for
   6  * TCM v4.x code
   7  *
   8  * (c) Copyright 2010-2013 Datera, Inc.
   9  *
  10  * Nicholas A. Bellinger <nab@linux-iscsi.org>
  11 *
  12  ****************************************************************************/
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/utsname.h>
  17 #include <linux/init.h>
  18 #include <linux/fs.h>
  19 #include <linux/namei.h>
  20 #include <linux/slab.h>
  21 #include <linux/types.h>
  22 #include <linux/delay.h>
  23 #include <linux/unistd.h>
  24 #include <linux/string.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/configfs.h>
  27
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_backend.h>
  30 #include <target/target_core_fabric.h>
  31
  32 #include "target_core_internal.h"
  33 #include "target_core_alua.h"
  34 #include "target_core_pr.h"
  35
  36 #define TF_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
  37 static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
  38 {                                                                       \
  39         struct config_item_type *cit = &tf->tf_##_name##_cit;           \
  40                                                                         \
  41         cit->ct_item_ops = _item_ops;                                   \
  42         cit->ct_group_ops = _group_ops;                                 \
  43         cit->ct_attrs = _attrs;                                         \
  44         cit->ct_owner = tf->tf_ops->module;                             \
  45         pr_debug("Setup generic %s\n", __stringify(_name));             \
  46 }
  47
  48 #define TF_CIT_SETUP_DRV(_name, _item_ops, _group_ops)          \
  49 static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
  50 {                                                                       \
  51         struct config_item_type *cit = &tf->tf_##_name##_cit;           \
  52         struct configfs_attribute **attrs = tf->tf_ops->tfc_##_name##_attrs; \
  53                                                                         \
  54         cit->ct_item_ops = _item_ops;                                   \
  55         cit->ct_group_ops = _group_ops;                                 \
  56         cit->ct_attrs = attrs;                                          \
  57         cit->ct_owner = tf->tf_ops->module;                             \
  58         pr_debug("Setup generic %s\n", __stringify(_name));             \
  59 }
  60
  61 static struct configfs_item_operations target_fabric_port_item_ops;
  62
  63 /* Start of tfc_tpg_mappedlun_cit */
  64
  65 static int target_fabric_mappedlun_link(
  66         struct config_item *lun_acl_ci,
  67         struct config_item *lun_ci)
  68 {
  69         struct se_dev_entry *deve;
  70         struct se_lun *lun;
  71         struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
  72                         struct se_lun_acl, se_lun_group);
  73         struct se_portal_group *se_tpg;
  74         struct config_item *nacl_ci, *tpg_ci, *tpg_ci_s, *wwn_ci, *wwn_ci_s;
  75         bool lun_access_ro;
  76
  77         if (!lun_ci->ci_type ||
  78             lun_ci->ci_type->ct_item_ops != &target_fabric_port_item_ops) {
  79                 pr_err("Bad lun_ci, not a valid lun_ci pointer: %p\n", lun_ci);
  80                 return -EFAULT;
  81         }
  82         lun = container_of(to_config_group(lun_ci), struct se_lun, lun_group);
  83
  84         /*
  85          * Ensure that the source port exists
  86          */
  87         if (!lun->lun_se_dev) {
  88                 pr_err("Source se_lun->lun_se_dev does not exist\n");
  89                 return -EINVAL;
  90         }
  91         if (lun->lun_shutdown) {
  92                 pr_err("Unable to create mappedlun symlink because"
  93                         " lun->lun_shutdown=true\n");
  94                 return -EINVAL;
  95         }
  96         se_tpg = lun->lun_tpg;
  97
  98         nacl_ci = &lun_acl_ci->ci_parent->ci_group->cg_item;
  99         tpg_ci = &nacl_ci->ci_group->cg_item;
 100         wwn_ci = &tpg_ci->ci_group->cg_item;
 101         tpg_ci_s = &lun_ci->ci_parent->ci_group->cg_item;
 102         wwn_ci_s = &tpg_ci_s->ci_group->cg_item;
 103         /*
 104          * Make sure the SymLink is going to the same $FABRIC/$WWN/tpgt_$TPGT
 105          */
 106         if (strcmp(config_item_name(wwn_ci), config_item_name(wwn_ci_s))) {
 107                 pr_err("Illegal Initiator ACL SymLink outside of %s\n",
 108                         config_item_name(wwn_ci));
 109                 return -EINVAL;
 110         }
 111         if (strcmp(config_item_name(tpg_ci), config_item_name(tpg_ci_s))) {
 112                 pr_err("Illegal Initiator ACL Symlink outside of %s"
 113                         " TPGT: %s\n", config_item_name(wwn_ci),
 114                         config_item_name(tpg_ci));
 115                 return -EINVAL;
 116         }
 117         /*
 118          * If this struct se_node_acl was dynamically generated with
 119          * tpg_1/attrib/generate_node_acls=1, use the existing
 120          * deve->lun_access_ro value, which will be true when
 121          * tpg_1/attrib/demo_mode_write_protect=1
 122          */
 123         rcu_read_lock();
 124         deve = target_nacl_find_deve(lacl->se_lun_nacl, lacl->mapped_lun);
 125         if (deve)
 126                 lun_access_ro = deve->lun_access_ro;
 127         else
 128                 lun_access_ro =
 129                         (se_tpg->se_tpg_tfo->tpg_check_prod_mode_write_protect(
 130                                 se_tpg)) ? true : false;
 131         rcu_read_unlock();
 132         /*
 133          * Determine the actual mapped LUN value user wants..
 134          *
 135          * This value is what the SCSI Initiator actually sees the
 136          * $FABRIC/$WWPN/$TPGT/lun/lun_* as on their SCSI Initiator Ports.
 137          */
 138         return core_dev_add_initiator_node_lun_acl(se_tpg, lacl, lun, lun_access_ro);
 139 }
 140
 141 static void target_fabric_mappedlun_unlink(
 142         struct config_item *lun_acl_ci,
 143         struct config_item *lun_ci)
 144 {
 145         struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
 146                         struct se_lun_acl, se_lun_group);
 147         struct se_lun *lun = container_of(to_config_group(lun_ci),
 148                         struct se_lun, lun_group);
 149
 150         core_dev_del_initiator_node_lun_acl(lun, lacl);
 151 }
 152
 153 static struct se_lun_acl *item_to_lun_acl(struct config_item *item)
 154 {
 155         return container_of(to_config_group(item), struct se_lun_acl,
 156                         se_lun_group);
 157 }
 158
 159 static ssize_t target_fabric_mappedlun_write_protect_show(
 160                 struct config_item *item, char *page)
 161 {
 162         struct se_lun_acl *lacl = item_to_lun_acl(item);
 163         struct se_node_acl *se_nacl = lacl->se_lun_nacl;
 164         struct se_dev_entry *deve;
 165         ssize_t len = 0;
 166
 167         rcu_read_lock();
 168         deve = target_nacl_find_deve(se_nacl, lacl->mapped_lun);
 169         if (deve) {
 170                 len = sprintf(page, "%d\n", deve->lun_access_ro);
 171         }
 172         rcu_read_unlock();
 173
 174         return len;
 175 }
 176
 177 static ssize_t target_fabric_mappedlun_write_protect_store(
 178                 struct config_item *item, const char *page, size_t count)
 179 {
 180         struct se_lun_acl *lacl = item_to_lun_acl(item);
 181         struct se_node_acl *se_nacl = lacl->se_lun_nacl;
 182         struct se_portal_group *se_tpg = se_nacl->se_tpg;
 183         unsigned long wp;
 184         int ret;
 185
 186         ret = kstrtoul(page, 0, &wp);
 187         if (ret)
 188                 return ret;
 189
 190         if ((wp != 1) && (wp != 0))
 191                 return -EINVAL;
 192
 193         /* wp=1 means lun_access_ro=true */
 194         core_update_device_list_access(lacl->mapped_lun, wp, lacl->se_lun_nacl);
 195
 196         pr_debug("%s_ConfigFS: Changed Initiator ACL: %s"
 197                 " Mapped LUN: %llu Write Protect bit to %s\n",
 198                 se_tpg->se_tpg_tfo->fabric_name,
 199                 se_nacl->initiatorname, lacl->mapped_lun, (wp) ? "ON" : "OFF");
 200
 201         return count;
 202
 203 }
 204
 205 CONFIGFS_ATTR(target_fabric_mappedlun_, write_protect);
 206
 207 static struct configfs_attribute *target_fabric_mappedlun_attrs[] = {
 208         &target_fabric_mappedlun_attr_write_protect,
 209         NULL,
 210 };
 211
 212 static void target_fabric_mappedlun_release(struct config_item *item)
 213 {
 214         struct se_lun_acl *lacl = container_of(to_config_group(item),
 215                                 struct se_lun_acl, se_lun_group);
 216         struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;
 217
 218         core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
 219 }
 220
 221 static struct configfs_item_operations target_fabric_mappedlun_item_ops = {
 222         .release                = target_fabric_mappedlun_release,
 223         .allow_link             = target_fabric_mappedlun_link,
 224         .drop_link              = target_fabric_mappedlun_unlink,
 225 };
 226
 227 TF_CIT_SETUP(tpg_mappedlun, &target_fabric_mappedlun_item_ops, NULL,
 228                 target_fabric_mappedlun_attrs);
 229
 230 /* End of tfc_tpg_mappedlun_cit */
 231
 232 /* Start of tfc_tpg_mappedlun_port_cit */
 233
 234 static struct config_group *target_core_mappedlun_stat_mkdir(
 235         struct config_group *group,
 236         const char *name)
 237 {
 238         return ERR_PTR(-ENOSYS);
 239 }
 240
 241 static void target_core_mappedlun_stat_rmdir(
 242         struct config_group *group,
 243         struct config_item *item)
 244 {
 245         return;
 246 }
 247
 248 static struct configfs_group_operations target_fabric_mappedlun_stat_group_ops = {
 249         .make_group             = target_core_mappedlun_stat_mkdir,
 250         .drop_item              = target_core_mappedlun_stat_rmdir,
 251 };
 252
 253 TF_CIT_SETUP(tpg_mappedlun_stat, NULL, &target_fabric_mappedlun_stat_group_ops,
 254                 NULL);
 255
 256 /* End of tfc_tpg_mappedlun_port_cit */
 257
 258 TF_CIT_SETUP_DRV(tpg_nacl_attrib, NULL, NULL);
 259 TF_CIT_SETUP_DRV(tpg_nacl_auth, NULL, NULL);
 260 TF_CIT_SETUP_DRV(tpg_nacl_param, NULL, NULL);
 261
 262 /* Start of tfc_tpg_nacl_base_cit */
 263
 264 static struct config_group *target_fabric_make_mappedlun(
 265         struct config_group *group,
 266         const char *name)
 267 {
 268         struct se_node_acl *se_nacl = container_of(group,
 269                         struct se_node_acl, acl_group);
 270         struct se_portal_group *se_tpg = se_nacl->se_tpg;
 271         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 272         struct se_lun_acl *lacl = NULL;
 273         char *buf;
 274         unsigned long long mapped_lun;
 275         int ret = 0;
 276
 277         buf = kzalloc(strlen(name) + 1, GFP_KERNEL);
 278         if (!buf) {
 279                 pr_err("Unable to allocate memory for name buf\n");
 280                 return ERR_PTR(-ENOMEM);
 281         }
 282         snprintf(buf, strlen(name) + 1, "%s", name);
 283         /*
 284          * Make sure user is creating iscsi/$IQN/$TPGT/acls/$INITIATOR/lun_$ID.
 285          */
 286         if (strstr(buf, "lun_") != buf) {
 287                 pr_err("Unable to locate \"lun_\" from buf: %s"
 288                         " name: %s\n", buf, name);
 289                 ret = -EINVAL;
 290                 goto out;
 291         }
 292         /*
 293          * Determine the Mapped LUN value.  This is what the SCSI Initiator
 294          * Port will actually see.
 295          */
 296         ret = kstrtoull(buf + 4, 0, &mapped_lun);
 297         if (ret)
 298                 goto out;
 299
 300         lacl = core_dev_init_initiator_node_lun_acl(se_tpg, se_nacl,
 301                         mapped_lun, &ret);
 302         if (!lacl) {
 303                 ret = -EINVAL;
 304                 goto out;
 305         }
 306
 307         config_group_init_type_name(&lacl->se_lun_group, name,
 308                         &tf->tf_tpg_mappedlun_cit);
 309
 310         config_group_init_type_name(&lacl->ml_stat_grps.stat_group,
 311                         "statistics", &tf->tf_tpg_mappedlun_stat_cit);
 312         configfs_add_default_group(&lacl->ml_stat_grps.stat_group,
 313                         &lacl->se_lun_group);
 314
 315         target_stat_setup_mappedlun_default_groups(lacl);
 316
 317         kfree(buf);
 318         return &lacl->se_lun_group;
 319 out:
 320         kfree(lacl);
 321         kfree(buf);
 322         return ERR_PTR(ret);
 323 }
 324
 325 static void target_fabric_drop_mappedlun(
 326         struct config_group *group,
 327         struct config_item *item)
 328 {
 329         struct se_lun_acl *lacl = container_of(to_config_group(item),
 330                         struct se_lun_acl, se_lun_group);
 331
 332         configfs_remove_default_groups(&lacl->ml_stat_grps.stat_group);
 333         configfs_remove_default_groups(&lacl->se_lun_group);
 334
 335         config_item_put(item);
 336 }
 337
 338 static void target_fabric_nacl_base_release(struct config_item *item)
 339 {
 340         struct se_node_acl *se_nacl = container_of(to_config_group(item),
 341                         struct se_node_acl, acl_group);
 342
 343         configfs_remove_default_groups(&se_nacl->acl_fabric_stat_group);
 344         core_tpg_del_initiator_node_acl(se_nacl);
 345 }
 346
 347 static struct configfs_item_operations target_fabric_nacl_base_item_ops = {
 348         .release                = target_fabric_nacl_base_release,
 349 };
 350
 351 static struct configfs_group_operations target_fabric_nacl_base_group_ops = {
 352         .make_group             = target_fabric_make_mappedlun,
 353         .drop_item              = target_fabric_drop_mappedlun,
 354 };
 355
 356 TF_CIT_SETUP_DRV(tpg_nacl_base, &target_fabric_nacl_base_item_ops,
 357                 &target_fabric_nacl_base_group_ops);
 358
 359 /* End of tfc_tpg_nacl_base_cit */
 360
 361 /* Start of tfc_node_fabric_stats_cit */
 362 /*
 363  * This is used as a placeholder for struct se_node_acl->acl_fabric_stat_group
 364  * to allow fabrics access to ->acl_fabric_stat_group->default_groups[]
 365  */
 366 TF_CIT_SETUP(tpg_nacl_stat, NULL, NULL, NULL);
 367
 368 /* End of tfc_wwn_fabric_stats_cit */
 369
 370 /* Start of tfc_tpg_nacl_cit */
 371
 372 static struct config_group *target_fabric_make_nodeacl(
 373         struct config_group *group,
 374         const char *name)
 375 {
 376         struct se_portal_group *se_tpg = container_of(group,
 377                         struct se_portal_group, tpg_acl_group);
 378         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 379         struct se_node_acl *se_nacl;
 380
 381         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, name);
 382         if (IS_ERR(se_nacl))
 383                 return ERR_CAST(se_nacl);
 384
 385         config_group_init_type_name(&se_nacl->acl_group, name,
 386                         &tf->tf_tpg_nacl_base_cit);
 387
 388         config_group_init_type_name(&se_nacl->acl_attrib_group, "attrib",
 389                         &tf->tf_tpg_nacl_attrib_cit);
 390         configfs_add_default_group(&se_nacl->acl_attrib_group,
 391                         &se_nacl->acl_group);
 392
 393         config_group_init_type_name(&se_nacl->acl_auth_group, "auth",
 394                         &tf->tf_tpg_nacl_auth_cit);
 395         configfs_add_default_group(&se_nacl->acl_auth_group,
 396                         &se_nacl->acl_group);
 397
 398         config_group_init_type_name(&se_nacl->acl_param_group, "param",
 399                         &tf->tf_tpg_nacl_param_cit);
 400         configfs_add_default_group(&se_nacl->acl_param_group,
 401                         &se_nacl->acl_group);
 402
 403         config_group_init_type_name(&se_nacl->acl_fabric_stat_group,
 404                         "fabric_statistics", &tf->tf_tpg_nacl_stat_cit);
 405         configfs_add_default_group(&se_nacl->acl_fabric_stat_group,
 406                         &se_nacl->acl_group);
 407
 408         if (tf->tf_ops->fabric_init_nodeacl) {
 409                 int ret = tf->tf_ops->fabric_init_nodeacl(se_nacl, name);
 410                 if (ret) {
 411                         configfs_remove_default_groups(&se_nacl->acl_fabric_stat_group);
 412                         core_tpg_del_initiator_node_acl(se_nacl);
 413                         return ERR_PTR(ret);
 414                 }
 415         }
 416
 417         return &se_nacl->acl_group;
 418 }
 419
 420 static void target_fabric_drop_nodeacl(
 421         struct config_group *group,
 422         struct config_item *item)
 423 {
 424         struct se_node_acl *se_nacl = container_of(to_config_group(item),
 425                         struct se_node_acl, acl_group);
 426
 427         configfs_remove_default_groups(&se_nacl->acl_group);
 428
 429         /*
 430          * struct se_node_acl free is done in target_fabric_nacl_base_release()
 431          */
 432         config_item_put(item);
 433 }
 434
 435 static struct configfs_group_operations target_fabric_nacl_group_ops = {
 436         .make_group     = target_fabric_make_nodeacl,
 437         .drop_item      = target_fabric_drop_nodeacl,
 438 };
 439
 440 TF_CIT_SETUP(tpg_nacl, NULL, &target_fabric_nacl_group_ops, NULL);
 441
 442 /* End of tfc_tpg_nacl_cit */
 443
 444 /* Start of tfc_tpg_np_base_cit */
 445
 446 static void target_fabric_np_base_release(struct config_item *item)
 447 {
 448         struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
 449                                 struct se_tpg_np, tpg_np_group);
 450         struct se_portal_group *se_tpg = se_tpg_np->tpg_np_parent;
 451         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 452
 453         tf->tf_ops->fabric_drop_np(se_tpg_np);
 454 }
 455
 456 static struct configfs_item_operations target_fabric_np_base_item_ops = {
 457         .release                = target_fabric_np_base_release,
 458 };
 459
 460 TF_CIT_SETUP_DRV(tpg_np_base, &target_fabric_np_base_item_ops, NULL);
 461
 462 /* End of tfc_tpg_np_base_cit */
 463
 464 /* Start of tfc_tpg_np_cit */
 465
 466 static struct config_group *target_fabric_make_np(
 467         struct config_group *group,
 468         const char *name)
 469 {
 470         struct se_portal_group *se_tpg = container_of(group,
 471                                 struct se_portal_group, tpg_np_group);
 472         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 473         struct se_tpg_np *se_tpg_np;
 474
 475         if (!tf->tf_ops->fabric_make_np) {
 476                 pr_err("tf->tf_ops.fabric_make_np is NULL\n");
 477                 return ERR_PTR(-ENOSYS);
 478         }
 479
 480         se_tpg_np = tf->tf_ops->fabric_make_np(se_tpg, group, name);
 481         if (!se_tpg_np || IS_ERR(se_tpg_np))
 482                 return ERR_PTR(-EINVAL);
 483
 484         se_tpg_np->tpg_np_parent = se_tpg;
 485         config_group_init_type_name(&se_tpg_np->tpg_np_group, name,
 486                         &tf->tf_tpg_np_base_cit);
 487
 488         return &se_tpg_np->tpg_np_group;
 489 }
 490
 491 static void target_fabric_drop_np(
 492         struct config_group *group,
 493         struct config_item *item)
 494 {
 495         /*
 496          * struct se_tpg_np is released via target_fabric_np_base_release()
 497          */
 498         config_item_put(item);
 499 }
 500
 501 static struct configfs_group_operations target_fabric_np_group_ops = {
 502         .make_group     = &target_fabric_make_np,
 503         .drop_item      = &target_fabric_drop_np,
 504 };
 505
 506 TF_CIT_SETUP(tpg_np, NULL, &target_fabric_np_group_ops, NULL);
 507
 508 /* End of tfc_tpg_np_cit */
 509
 510 /* Start of tfc_tpg_port_cit */
 511
 512 static struct se_lun *item_to_lun(struct config_item *item)
 513 {
 514         return container_of(to_config_group(item), struct se_lun,
 515                         lun_group);
 516 }
 517
 518 static ssize_t target_fabric_port_alua_tg_pt_gp_show(struct config_item *item,
 519                 char *page)
 520 {
 521         struct se_lun *lun = item_to_lun(item);
 522
 523         if (!lun || !lun->lun_se_dev)
 524                 return -ENODEV;
 525
 526         return core_alua_show_tg_pt_gp_info(lun, page);
 527 }
 528
 529 static ssize_t target_fabric_port_alua_tg_pt_gp_store(struct config_item *item,
 530                 const char *page, size_t count)
 531 {
 532         struct se_lun *lun = item_to_lun(item);
 533
 534         if (!lun || !lun->lun_se_dev)
 535                 return -ENODEV;
 536
 537         return core_alua_store_tg_pt_gp_info(lun, page, count);
 538 }
 539
 540 static ssize_t target_fabric_port_alua_tg_pt_offline_show(
 541                 struct config_item *item, char *page)
 542 {
 543         struct se_lun *lun = item_to_lun(item);
 544
 545         if (!lun || !lun->lun_se_dev)
 546                 return -ENODEV;
 547
 548         return core_alua_show_offline_bit(lun, page);
 549 }
 550
 551 static ssize_t target_fabric_port_alua_tg_pt_offline_store(
 552                 struct config_item *item, const char *page, size_t count)
 553 {
 554         struct se_lun *lun = item_to_lun(item);
 555
 556         if (!lun || !lun->lun_se_dev)
 557                 return -ENODEV;
 558
 559         return core_alua_store_offline_bit(lun, page, count);
 560 }
 561
 562 static ssize_t target_fabric_port_alua_tg_pt_status_show(
 563                 struct config_item *item, char *page)
 564 {
 565         struct se_lun *lun = item_to_lun(item);
 566
 567         if (!lun || !lun->lun_se_dev)
 568                 return -ENODEV;
 569
 570         return core_alua_show_secondary_status(lun, page);
 571 }
 572
 573 static ssize_t target_fabric_port_alua_tg_pt_status_store(
 574                 struct config_item *item, const char *page, size_t count)
 575 {
 576         struct se_lun *lun = item_to_lun(item);
 577
 578         if (!lun || !lun->lun_se_dev)
 579                 return -ENODEV;
 580
 581         return core_alua_store_secondary_status(lun, page, count);
 582 }
 583
 584 static ssize_t target_fabric_port_alua_tg_pt_write_md_show(
 585                 struct config_item *item, char *page)
 586 {
 587         struct se_lun *lun = item_to_lun(item);
 588
 589         if (!lun || !lun->lun_se_dev)
 590                 return -ENODEV;
 591
 592         return core_alua_show_secondary_write_metadata(lun, page);
 593 }
 594
 595 static ssize_t target_fabric_port_alua_tg_pt_write_md_store(
 596                 struct config_item *item, const char *page, size_t count)
 597 {
 598         struct se_lun *lun = item_to_lun(item);
 599
 600         if (!lun || !lun->lun_se_dev)
 601                 return -ENODEV;
 602
 603         return core_alua_store_secondary_write_metadata(lun, page, count);
 604 }
 605
 606 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_gp);
 607 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_offline);
 608 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_status);
 609 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_write_md);
 610
 611 static struct configfs_attribute *target_fabric_port_attrs[] = {
 612         &target_fabric_port_attr_alua_tg_pt_gp,
 613         &target_fabric_port_attr_alua_tg_pt_offline,
 614         &target_fabric_port_attr_alua_tg_pt_status,
 615         &target_fabric_port_attr_alua_tg_pt_write_md,
 616         NULL,
 617 };
 618
 619 static int target_fabric_port_link(
 620         struct config_item *lun_ci,
 621         struct config_item *se_dev_ci)
 622 {
 623         struct config_item *tpg_ci;
 624         struct se_lun *lun = container_of(to_config_group(lun_ci),
 625                                 struct se_lun, lun_group);
 626         struct se_portal_group *se_tpg;
 627         struct se_device *dev;
 628         struct target_fabric_configfs *tf;
 629         int ret;
 630
 631         if (!se_dev_ci->ci_type ||
 632             se_dev_ci->ci_type->ct_item_ops != &target_core_dev_item_ops) {
 633                 pr_err("Bad se_dev_ci, not a valid se_dev_ci pointer: %p\n", se_dev_ci);
 634                 return -EFAULT;
 635         }
 636         dev = container_of(to_config_group(se_dev_ci), struct se_device, dev_group);
 637
 638         if (!target_dev_configured(dev)) {
 639                 pr_err("se_device not configured yet, cannot port link\n");
 640                 return -ENODEV;
 641         }
 642
 643         tpg_ci = &lun_ci->ci_parent->ci_group->cg_item;
 644         se_tpg = container_of(to_config_group(tpg_ci),
 645                                 struct se_portal_group, tpg_group);
 646         tf = se_tpg->se_tpg_wwn->wwn_tf;
 647
 648         if (lun->lun_se_dev !=  NULL) {
 649                 pr_err("Port Symlink already exists\n");
 650                 return -EEXIST;
 651         }
 652
 653         ret = core_dev_add_lun(se_tpg, dev, lun);
 654         if (ret) {
 655                 pr_err("core_dev_add_lun() failed: %d\n", ret);
 656                 goto out;
 657         }
 658
 659         if (tf->tf_ops->fabric_post_link) {
 660                 /*
 661                  * Call the optional fabric_post_link() to allow a
 662                  * fabric module to setup any additional state once
 663                  * core_dev_add_lun() has been called..
 664                  */
 665                 tf->tf_ops->fabric_post_link(se_tpg, lun);
 666         }
 667
 668         return 0;
 669 out:
 670         return ret;
 671 }
 672
 673 static void target_fabric_port_unlink(
 674         struct config_item *lun_ci,
 675         struct config_item *se_dev_ci)
 676 {
 677         struct se_lun *lun = container_of(to_config_group(lun_ci),
 678                                 struct se_lun, lun_group);
 679         struct se_portal_group *se_tpg = lun->lun_tpg;
 680         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 681
 682         if (tf->tf_ops->fabric_pre_unlink) {
 683                 /*
 684                  * Call the optional fabric_pre_unlink() to allow a
 685                  * fabric module to release any additional stat before
 686                  * core_dev_del_lun() is called.
 687                 */
 688                 tf->tf_ops->fabric_pre_unlink(se_tpg, lun);
 689         }
 690
 691         core_dev_del_lun(se_tpg, lun);
 692 }
 693
 694 static void target_fabric_port_release(struct config_item *item)
 695 {
 696         struct se_lun *lun = container_of(to_config_group(item),
 697                                           struct se_lun, lun_group);
 698
 699         kfree_rcu(lun, rcu_head);
 700 }
 701
 702 static struct configfs_item_operations target_fabric_port_item_ops = {
 703         .release                = target_fabric_port_release,
 704         .allow_link             = target_fabric_port_link,
 705         .drop_link              = target_fabric_port_unlink,
 706 };
 707
 708 TF_CIT_SETUP(tpg_port, &target_fabric_port_item_ops, NULL, target_fabric_port_attrs);
 709
 710 /* End of tfc_tpg_port_cit */
 711
 712 /* Start of tfc_tpg_port_stat_cit */
 713
 714 static struct config_group *target_core_port_stat_mkdir(
 715         struct config_group *group,
 716         const char *name)
 717 {
 718         return ERR_PTR(-ENOSYS);
 719 }
 720
 721 static void target_core_port_stat_rmdir(
 722         struct config_group *group,
 723         struct config_item *item)
 724 {
 725         return;
 726 }
 727
 728 static struct configfs_group_operations target_fabric_port_stat_group_ops = {
 729         .make_group             = target_core_port_stat_mkdir,
 730         .drop_item              = target_core_port_stat_rmdir,
 731 };
 732
 733 TF_CIT_SETUP(tpg_port_stat, NULL, &target_fabric_port_stat_group_ops, NULL);
 734
 735 /* End of tfc_tpg_port_stat_cit */
 736
 737 /* Start of tfc_tpg_lun_cit */
 738
 739 static struct config_group *target_fabric_make_lun(
 740         struct config_group *group,
 741         const char *name)
 742 {
 743         struct se_lun *lun;
 744         struct se_portal_group *se_tpg = container_of(group,
 745                         struct se_portal_group, tpg_lun_group);
 746         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 747         unsigned long long unpacked_lun;
 748         int errno;
 749
 750         if (strstr(name, "lun_") != name) {
 751                 pr_err("Unable to locate \'_\" in"
 752                                 " \"lun_$LUN_NUMBER\"\n");
 753                 return ERR_PTR(-EINVAL);
 754         }
 755         errno = kstrtoull(name + 4, 0, &unpacked_lun);
 756         if (errno)
 757                 return ERR_PTR(errno);
 758
 759         lun = core_tpg_alloc_lun(se_tpg, unpacked_lun);
 760         if (IS_ERR(lun))
 761                 return ERR_CAST(lun);
 762
 763         config_group_init_type_name(&lun->lun_group, name,
 764                         &tf->tf_tpg_port_cit);
 765
 766         config_group_init_type_name(&lun->port_stat_grps.stat_group,
 767                         "statistics", &tf->tf_tpg_port_stat_cit);
 768         configfs_add_default_group(&lun->port_stat_grps.stat_group,
 769                         &lun->lun_group);
 770
 771         target_stat_setup_port_default_groups(lun);
 772
 773         return &lun->lun_group;
 774 }
 775
 776 static void target_fabric_drop_lun(
 777         struct config_group *group,
 778         struct config_item *item)
 779 {
 780         struct se_lun *lun = container_of(to_config_group(item),
 781                                 struct se_lun, lun_group);
 782
 783         configfs_remove_default_groups(&lun->port_stat_grps.stat_group);
 784         configfs_remove_default_groups(&lun->lun_group);
 785
 786         config_item_put(item);
 787 }
 788
 789 static struct configfs_group_operations target_fabric_lun_group_ops = {
 790         .make_group     = &target_fabric_make_lun,
 791         .drop_item      = &target_fabric_drop_lun,
 792 };
 793
 794 TF_CIT_SETUP(tpg_lun, NULL, &target_fabric_lun_group_ops, NULL);
 795
 796 /* End of tfc_tpg_lun_cit */
 797
 798 TF_CIT_SETUP_DRV(tpg_attrib, NULL, NULL);
 799 TF_CIT_SETUP_DRV(tpg_auth, NULL, NULL);
 800 TF_CIT_SETUP_DRV(tpg_param, NULL, NULL);
 801
 802 /* Start of tfc_tpg_base_cit */
 803
 804 static void target_fabric_tpg_release(struct config_item *item)
 805 {
 806         struct se_portal_group *se_tpg = container_of(to_config_group(item),
 807                         struct se_portal_group, tpg_group);
 808         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
 809         struct target_fabric_configfs *tf = wwn->wwn_tf;
 810
 811         tf->tf_ops->fabric_drop_tpg(se_tpg);
 812 }
 813
 814 static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
 815         .release                = target_fabric_tpg_release,
 816 };
 817
 818 TF_CIT_SETUP_DRV(tpg_base, &target_fabric_tpg_base_item_ops, NULL);
 819
 820 /* End of tfc_tpg_base_cit */
 821
 822 /* Start of tfc_tpg_cit */
 823
 824 static struct config_group *target_fabric_make_tpg(
 825         struct config_group *group,
 826         const char *name)
 827 {
 828         struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
 829         struct target_fabric_configfs *tf = wwn->wwn_tf;
 830         struct se_portal_group *se_tpg;
 831
 832         if (!tf->tf_ops->fabric_make_tpg) {
 833                 pr_err("tf->tf_ops->fabric_make_tpg is NULL\n");
 834                 return ERR_PTR(-ENOSYS);
 835         }
 836
 837         se_tpg = tf->tf_ops->fabric_make_tpg(wwn, name);
 838         if (!se_tpg || IS_ERR(se_tpg))
 839                 return ERR_PTR(-EINVAL);
 840
 841         config_group_init_type_name(&se_tpg->tpg_group, name,
 842                         &tf->tf_tpg_base_cit);
 843
 844         config_group_init_type_name(&se_tpg->tpg_lun_group, "lun",
 845                         &tf->tf_tpg_lun_cit);
 846         configfs_add_default_group(&se_tpg->tpg_lun_group,
 847                         &se_tpg->tpg_group);
 848
 849         config_group_init_type_name(&se_tpg->tpg_np_group, "np",
 850                         &tf->tf_tpg_np_cit);
 851         configfs_add_default_group(&se_tpg->tpg_np_group,
 852                         &se_tpg->tpg_group);
 853
 854         config_group_init_type_name(&se_tpg->tpg_acl_group, "acls",
 855                         &tf->tf_tpg_nacl_cit);
 856         configfs_add_default_group(&se_tpg->tpg_acl_group,
 857                         &se_tpg->tpg_group);
 858
 859         config_group_init_type_name(&se_tpg->tpg_attrib_group, "attrib",
 860                         &tf->tf_tpg_attrib_cit);
 861         configfs_add_default_group(&se_tpg->tpg_attrib_group,
 862                         &se_tpg->tpg_group);
 863
 864         config_group_init_type_name(&se_tpg->tpg_auth_group, "auth",
 865                         &tf->tf_tpg_auth_cit);
 866         configfs_add_default_group(&se_tpg->tpg_auth_group,
 867                         &se_tpg->tpg_group);
 868
 869         config_group_init_type_name(&se_tpg->tpg_param_group, "param",
 870                         &tf->tf_tpg_param_cit);
 871         configfs_add_default_group(&se_tpg->tpg_param_group,
 872                         &se_tpg->tpg_group);
 873
 874         return &se_tpg->tpg_group;
 875 }
 876
 877 static void target_fabric_drop_tpg(
 878         struct config_group *group,
 879         struct config_item *item)
 880 {
 881         struct se_portal_group *se_tpg = container_of(to_config_group(item),
 882                                 struct se_portal_group, tpg_group);
 883
 884         configfs_remove_default_groups(&se_tpg->tpg_group);
 885         config_item_put(item);
 886 }
 887
 888 static void target_fabric_release_wwn(struct config_item *item)
 889 {
 890         struct se_wwn *wwn = container_of(to_config_group(item),
 891                                 struct se_wwn, wwn_group);
 892         struct target_fabric_configfs *tf = wwn->wwn_tf;
 893
 894         configfs_remove_default_groups(&wwn->fabric_stat_group);
 895         tf->tf_ops->fabric_drop_wwn(wwn);
 896 }
 897
 898 static struct configfs_item_operations target_fabric_tpg_item_ops = {
 899         .release        = target_fabric_release_wwn,
 900 };
 901
 902 static struct configfs_group_operations target_fabric_tpg_group_ops = {
 903         .make_group     = target_fabric_make_tpg,
 904         .drop_item      = target_fabric_drop_tpg,
 905 };
 906
 907 TF_CIT_SETUP(tpg, &target_fabric_tpg_item_ops, &target_fabric_tpg_group_ops,
 908                 NULL);
 909
 910 /* End of tfc_tpg_cit */
 911
 912 /* Start of tfc_wwn_fabric_stats_cit */
 913 /*
 914  * This is used as a placeholder for struct se_wwn->fabric_stat_group
 915  * to allow fabrics access to ->fabric_stat_group->default_groups[]
 916  */
 917 TF_CIT_SETUP(wwn_fabric_stats, NULL, NULL, NULL);
 918
 919 /* End of tfc_wwn_fabric_stats_cit */
 920
 921 /* Start of tfc_wwn_cit */
 922
 923 static struct config_group *target_fabric_make_wwn(
 924         struct config_group *group,
 925         const char *name)
 926 {
 927         struct target_fabric_configfs *tf = container_of(group,
 928                                 struct target_fabric_configfs, tf_group);
 929         struct se_wwn *wwn;
 930
 931         if (!tf->tf_ops->fabric_make_wwn) {
 932                 pr_err("tf->tf_ops.fabric_make_wwn is NULL\n");
 933                 return ERR_PTR(-ENOSYS);
 934         }
 935
 936         wwn = tf->tf_ops->fabric_make_wwn(tf, group, name);
 937         if (!wwn || IS_ERR(wwn))
 938                 return ERR_PTR(-EINVAL);
 939
 940         wwn->wwn_tf = tf;
 941
 942         config_group_init_type_name(&wwn->wwn_group, name, &tf->tf_tpg_cit);
 943
 944         config_group_init_type_name(&wwn->fabric_stat_group, "fabric_statistics",
 945                         &tf->tf_wwn_fabric_stats_cit);
 946         configfs_add_default_group(&wwn->fabric_stat_group, &wwn->wwn_group);
 947
 948         if (tf->tf_ops->add_wwn_groups)
 949                 tf->tf_ops->add_wwn_groups(wwn);
 950         return &wwn->wwn_group;
 951 }
 952
 953 static void target_fabric_drop_wwn(
 954         struct config_group *group,
 955         struct config_item *item)
 956 {
 957         struct se_wwn *wwn = container_of(to_config_group(item),
 958                                 struct se_wwn, wwn_group);
 959
 960         configfs_remove_default_groups(&wwn->wwn_group);
 961         config_item_put(item);
 962 }
 963
 964 static struct configfs_group_operations target_fabric_wwn_group_ops = {
 965         .make_group     = target_fabric_make_wwn,
 966         .drop_item      = target_fabric_drop_wwn,
 967 };
 968
 969 TF_CIT_SETUP_DRV(wwn, NULL, &target_fabric_wwn_group_ops);
 970 TF_CIT_SETUP_DRV(discovery, NULL, NULL);
 971
 972 int target_fabric_setup_cits(struct target_fabric_configfs *tf)
 973 {
 974         target_fabric_setup_discovery_cit(tf);
 975         target_fabric_setup_wwn_cit(tf);
 976         target_fabric_setup_wwn_fabric_stats_cit(tf);
 977         target_fabric_setup_tpg_cit(tf);
 978         target_fabric_setup_tpg_base_cit(tf);
 979         target_fabric_setup_tpg_port_cit(tf);
 980         target_fabric_setup_tpg_port_stat_cit(tf);
 981         target_fabric_setup_tpg_lun_cit(tf);
 982         target_fabric_setup_tpg_np_cit(tf);
 983         target_fabric_setup_tpg_np_base_cit(tf);
 984         target_fabric_setup_tpg_attrib_cit(tf);
 985         target_fabric_setup_tpg_auth_cit(tf);
 986         target_fabric_setup_tpg_param_cit(tf);
 987         target_fabric_setup_tpg_nacl_cit(tf);
 988         target_fabric_setup_tpg_nacl_base_cit(tf);
 989         target_fabric_setup_tpg_nacl_attrib_cit(tf);
 990         target_fabric_setup_tpg_nacl_auth_cit(tf);
 991         target_fabric_setup_tpg_nacl_param_cit(tf);
 992         target_fabric_setup_tpg_nacl_stat_cit(tf);
 993         target_fabric_setup_tpg_mappedlun_cit(tf);
 994         target_fabric_setup_tpg_mappedlun_stat_cit(tf);
 995
 996         return 0;
 997 }