drivers/target/target_core_fabric_configfs.c

   1 /*******************************************************************************
   2 * Filename: target_core_fabric_configfs.c
   3  *
   4  * This file contains generic fabric module configfs infrastructure for
   5  * TCM v4.x code
   6  *
   7  * (c) Copyright 2010-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@linux-iscsi.org>
  10 *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  ****************************************************************************/
  21
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/utsname.h>
  25 #include <linux/init.h>
  26 #include <linux/fs.h>
  27 #include <linux/namei.h>
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/delay.h>
  31 #include <linux/unistd.h>
  32 #include <linux/string.h>
  33 #include <linux/syscalls.h>
  34 #include <linux/configfs.h>
  35
  36 #include <target/target_core_base.h>
  37 #include <target/target_core_fabric.h>
  38
  39 #include "target_core_internal.h"
  40 #include "target_core_alua.h"
  41 #include "target_core_pr.h"
  42
  43 #define TF_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
  44 static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
  45 {                                                                       \
  46         struct config_item_type *cit = &tf->tf_##_name##_cit;           \
  47                                                                         \
  48         cit->ct_item_ops = _item_ops;                                   \
  49         cit->ct_group_ops = _group_ops;                                 \
  50         cit->ct_attrs = _attrs;                                         \
  51         cit->ct_owner = tf->tf_ops->module;                             \
  52         pr_debug("Setup generic %s\n", __stringify(_name));             \
  53 }
  54
  55 #define TF_CIT_SETUP_DRV(_name, _item_ops, _group_ops)          \
  56 static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
  57 {                                                                       \
  58         struct config_item_type *cit = &tf->tf_##_name##_cit;           \
  59         struct configfs_attribute **attrs = tf->tf_ops->tfc_##_name##_attrs; \
  60                                                                         \
  61         cit->ct_item_ops = _item_ops;                                   \
  62         cit->ct_group_ops = _group_ops;                                 \
  63         cit->ct_attrs = attrs;                                          \
  64         cit->ct_owner = tf->tf_ops->module;                             \
  65         pr_debug("Setup generic %s\n", __stringify(_name));             \
  66 }
  67
  68 /* Start of tfc_tpg_mappedlun_cit */
  69
  70 static int target_fabric_mappedlun_link(
  71         struct config_item *lun_acl_ci,
  72         struct config_item *lun_ci)
  73 {
  74         struct se_dev_entry *deve;
  75         struct se_lun *lun = container_of(to_config_group(lun_ci),
  76                         struct se_lun, lun_group);
  77         struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
  78                         struct se_lun_acl, se_lun_group);
  79         struct se_portal_group *se_tpg;
  80         struct config_item *nacl_ci, *tpg_ci, *tpg_ci_s, *wwn_ci, *wwn_ci_s;
  81         int lun_access;
  82
  83         if (lun->lun_link_magic != SE_LUN_LINK_MAGIC) {
  84                 pr_err("Bad lun->lun_link_magic, not a valid lun_ci pointer:"
  85                         " %p to struct lun: %p\n", lun_ci, lun);
  86                 return -EFAULT;
  87         }
  88         /*
  89          * Ensure that the source port exists
  90          */
  91         if (!lun->lun_se_dev) {
  92                 pr_err("Source se_lun->lun_se_dev does not exist\n");
  93                 return -EINVAL;
  94         }
  95         if (lun->lun_shutdown) {
  96                 pr_err("Unable to create mappedlun symlink because"
  97                         " lun->lun_shutdown=true\n");
  98                 return -EINVAL;
  99         }
 100         se_tpg = lun->lun_tpg;
 101
 102         nacl_ci = &lun_acl_ci->ci_parent->ci_group->cg_item;
 103         tpg_ci = &nacl_ci->ci_group->cg_item;
 104         wwn_ci = &tpg_ci->ci_group->cg_item;
 105         tpg_ci_s = &lun_ci->ci_parent->ci_group->cg_item;
 106         wwn_ci_s = &tpg_ci_s->ci_group->cg_item;
 107         /*
 108          * Make sure the SymLink is going to the same $FABRIC/$WWN/tpgt_$TPGT
 109          */
 110         if (strcmp(config_item_name(wwn_ci), config_item_name(wwn_ci_s))) {
 111                 pr_err("Illegal Initiator ACL SymLink outside of %s\n",
 112                         config_item_name(wwn_ci));
 113                 return -EINVAL;
 114         }
 115         if (strcmp(config_item_name(tpg_ci), config_item_name(tpg_ci_s))) {
 116                 pr_err("Illegal Initiator ACL Symlink outside of %s"
 117                         " TPGT: %s\n", config_item_name(wwn_ci),
 118                         config_item_name(tpg_ci));
 119                 return -EINVAL;
 120         }
 121         /*
 122          * If this struct se_node_acl was dynamically generated with
 123          * tpg_1/attrib/generate_node_acls=1, use the existing deve->lun_flags,
 124          * which be will write protected (READ-ONLY) when
 125          * tpg_1/attrib/demo_mode_write_protect=1
 126          */
 127         rcu_read_lock();
 128         deve = target_nacl_find_deve(lacl->se_lun_nacl, lacl->mapped_lun);
 129         if (deve)
 130                 lun_access = deve->lun_flags;
 131         else
 132                 lun_access =
 133                         (se_tpg->se_tpg_tfo->tpg_check_prod_mode_write_protect(
 134                                 se_tpg)) ? TRANSPORT_LUNFLAGS_READ_ONLY :
 135                                            TRANSPORT_LUNFLAGS_READ_WRITE;
 136         rcu_read_unlock();
 137         /*
 138          * Determine the actual mapped LUN value user wants..
 139          *
 140          * This value is what the SCSI Initiator actually sees the
 141          * $FABRIC/$WWPN/$TPGT/lun/lun_* as on their SCSI Initiator Ports.
 142          */
 143         return core_dev_add_initiator_node_lun_acl(se_tpg, lacl, lun, lun_access);
 144 }
 145
 146 static int target_fabric_mappedlun_unlink(
 147         struct config_item *lun_acl_ci,
 148         struct config_item *lun_ci)
 149 {
 150         struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
 151                         struct se_lun_acl, se_lun_group);
 152         struct se_lun *lun = container_of(to_config_group(lun_ci),
 153                         struct se_lun, lun_group);
 154
 155         return core_dev_del_initiator_node_lun_acl(lun, lacl);
 156 }
 157
 158 static struct se_lun_acl *item_to_lun_acl(struct config_item *item)
 159 {
 160         return container_of(to_config_group(item), struct se_lun_acl,
 161                         se_lun_group);
 162 }
 163
 164 static ssize_t target_fabric_mappedlun_write_protect_show(
 165                 struct config_item *item, char *page)
 166 {
 167         struct se_lun_acl *lacl = item_to_lun_acl(item);
 168         struct se_node_acl *se_nacl = lacl->se_lun_nacl;
 169         struct se_dev_entry *deve;
 170         ssize_t len = 0;
 171
 172         rcu_read_lock();
 173         deve = target_nacl_find_deve(se_nacl, lacl->mapped_lun);
 174         if (deve) {
 175                 len = sprintf(page, "%d\n",
 176                         (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) ? 1 : 0);
 177         }
 178         rcu_read_unlock();
 179
 180         return len;
 181 }
 182
 183 static ssize_t target_fabric_mappedlun_write_protect_store(
 184                 struct config_item *item, const char *page, size_t count)
 185 {
 186         struct se_lun_acl *lacl = item_to_lun_acl(item);
 187         struct se_node_acl *se_nacl = lacl->se_lun_nacl;
 188         struct se_portal_group *se_tpg = se_nacl->se_tpg;
 189         unsigned long op;
 190         int ret;
 191
 192         ret = kstrtoul(page, 0, &op);
 193         if (ret)
 194                 return ret;
 195
 196         if ((op != 1) && (op != 0))
 197                 return -EINVAL;
 198
 199         core_update_device_list_access(lacl->mapped_lun, (op) ?
 200                         TRANSPORT_LUNFLAGS_READ_ONLY :
 201                         TRANSPORT_LUNFLAGS_READ_WRITE,
 202                         lacl->se_lun_nacl);
 203
 204         pr_debug("%s_ConfigFS: Changed Initiator ACL: %s"
 205                 " Mapped LUN: %llu Write Protect bit to %s\n",
 206                 se_tpg->se_tpg_tfo->get_fabric_name(),
 207                 se_nacl->initiatorname, lacl->mapped_lun, (op) ? "ON" : "OFF");
 208
 209         return count;
 210
 211 }
 212
 213 CONFIGFS_ATTR(target_fabric_mappedlun_, write_protect);
 214
 215 static struct configfs_attribute *target_fabric_mappedlun_attrs[] = {
 216         &target_fabric_mappedlun_attr_write_protect,
 217         NULL,
 218 };
 219
 220 static void target_fabric_mappedlun_release(struct config_item *item)
 221 {
 222         struct se_lun_acl *lacl = container_of(to_config_group(item),
 223                                 struct se_lun_acl, se_lun_group);
 224         struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;
 225
 226         core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
 227 }
 228
 229 static struct configfs_item_operations target_fabric_mappedlun_item_ops = {
 230         .release                = target_fabric_mappedlun_release,
 231         .allow_link             = target_fabric_mappedlun_link,
 232         .drop_link              = target_fabric_mappedlun_unlink,
 233 };
 234
 235 TF_CIT_SETUP(tpg_mappedlun, &target_fabric_mappedlun_item_ops, NULL,
 236                 target_fabric_mappedlun_attrs);
 237
 238 /* End of tfc_tpg_mappedlun_cit */
 239
 240 /* Start of tfc_tpg_mappedlun_port_cit */
 241
 242 static struct config_group *target_core_mappedlun_stat_mkdir(
 243         struct config_group *group,
 244         const char *name)
 245 {
 246         return ERR_PTR(-ENOSYS);
 247 }
 248
 249 static void target_core_mappedlun_stat_rmdir(
 250         struct config_group *group,
 251         struct config_item *item)
 252 {
 253         return;
 254 }
 255
 256 static struct configfs_group_operations target_fabric_mappedlun_stat_group_ops = {
 257         .make_group             = target_core_mappedlun_stat_mkdir,
 258         .drop_item              = target_core_mappedlun_stat_rmdir,
 259 };
 260
 261 TF_CIT_SETUP(tpg_mappedlun_stat, NULL, &target_fabric_mappedlun_stat_group_ops,
 262                 NULL);
 263
 264 /* End of tfc_tpg_mappedlun_port_cit */
 265
 266 TF_CIT_SETUP_DRV(tpg_nacl_attrib, NULL, NULL);
 267 TF_CIT_SETUP_DRV(tpg_nacl_auth, NULL, NULL);
 268 TF_CIT_SETUP_DRV(tpg_nacl_param, NULL, NULL);
 269
 270 /* Start of tfc_tpg_nacl_base_cit */
 271
 272 static struct config_group *target_fabric_make_mappedlun(
 273         struct config_group *group,
 274         const char *name)
 275 {
 276         struct se_node_acl *se_nacl = container_of(group,
 277                         struct se_node_acl, acl_group);
 278         struct se_portal_group *se_tpg = se_nacl->se_tpg;
 279         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 280         struct se_lun_acl *lacl = NULL;
 281         struct config_item *acl_ci;
 282         struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
 283         char *buf;
 284         unsigned long long mapped_lun;
 285         int ret = 0;
 286
 287         acl_ci = &group->cg_item;
 288         if (!acl_ci) {
 289                 pr_err("Unable to locatel acl_ci\n");
 290                 return NULL;
 291         }
 292
 293         buf = kzalloc(strlen(name) + 1, GFP_KERNEL);
 294         if (!buf) {
 295                 pr_err("Unable to allocate memory for name buf\n");
 296                 return ERR_PTR(-ENOMEM);
 297         }
 298         snprintf(buf, strlen(name) + 1, "%s", name);
 299         /*
 300          * Make sure user is creating iscsi/$IQN/$TPGT/acls/$INITIATOR/lun_$ID.
 301          */
 302         if (strstr(buf, "lun_") != buf) {
 303                 pr_err("Unable to locate \"lun_\" from buf: %s"
 304                         " name: %s\n", buf, name);
 305                 ret = -EINVAL;
 306                 goto out;
 307         }
 308         /*
 309          * Determine the Mapped LUN value.  This is what the SCSI Initiator
 310          * Port will actually see.
 311          */
 312         ret = kstrtoull(buf + 4, 0, &mapped_lun);
 313         if (ret)
 314                 goto out;
 315
 316         lacl = core_dev_init_initiator_node_lun_acl(se_tpg, se_nacl,
 317                         mapped_lun, &ret);
 318         if (!lacl) {
 319                 ret = -EINVAL;
 320                 goto out;
 321         }
 322
 323         lacl_cg = &lacl->se_lun_group;
 324         lacl_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
 325                                 GFP_KERNEL);
 326         if (!lacl_cg->default_groups) {
 327                 pr_err("Unable to allocate lacl_cg->default_groups\n");
 328                 ret = -ENOMEM;
 329                 goto out;
 330         }
 331
 332         config_group_init_type_name(&lacl->se_lun_group, name,
 333                         &tf->tf_tpg_mappedlun_cit);
 334         config_group_init_type_name(&lacl->ml_stat_grps.stat_group,
 335                         "statistics", &tf->tf_tpg_mappedlun_stat_cit);
 336         lacl_cg->default_groups[0] = &lacl->ml_stat_grps.stat_group;
 337         lacl_cg->default_groups[1] = NULL;
 338
 339         ml_stat_grp = &lacl->ml_stat_grps.stat_group;
 340         ml_stat_grp->default_groups = kmalloc(sizeof(struct config_group *) * 3,
 341                                 GFP_KERNEL);
 342         if (!ml_stat_grp->default_groups) {
 343                 pr_err("Unable to allocate ml_stat_grp->default_groups\n");
 344                 ret = -ENOMEM;
 345                 goto out;
 346         }
 347         target_stat_setup_mappedlun_default_groups(lacl);
 348
 349         kfree(buf);
 350         return &lacl->se_lun_group;
 351 out:
 352         if (lacl_cg)
 353                 kfree(lacl_cg->default_groups);
 354         kfree(lacl);
 355         kfree(buf);
 356         return ERR_PTR(ret);
 357 }
 358
 359 static void target_fabric_drop_mappedlun(
 360         struct config_group *group,
 361         struct config_item *item)
 362 {
 363         struct se_lun_acl *lacl = container_of(to_config_group(item),
 364                         struct se_lun_acl, se_lun_group);
 365         struct config_item *df_item;
 366         struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
 367         int i;
 368
 369         ml_stat_grp = &lacl->ml_stat_grps.stat_group;
 370         for (i = 0; ml_stat_grp->default_groups[i]; i++) {
 371                 df_item = &ml_stat_grp->default_groups[i]->cg_item;
 372                 ml_stat_grp->default_groups[i] = NULL;
 373                 config_item_put(df_item);
 374         }
 375         kfree(ml_stat_grp->default_groups);
 376
 377         lacl_cg = &lacl->se_lun_group;
 378         for (i = 0; lacl_cg->default_groups[i]; i++) {
 379                 df_item = &lacl_cg->default_groups[i]->cg_item;
 380                 lacl_cg->default_groups[i] = NULL;
 381                 config_item_put(df_item);
 382         }
 383         kfree(lacl_cg->default_groups);
 384
 385         config_item_put(item);
 386 }
 387
 388 static void target_fabric_nacl_base_release(struct config_item *item)
 389 {
 390         struct se_node_acl *se_nacl = container_of(to_config_group(item),
 391                         struct se_node_acl, acl_group);
 392         struct target_fabric_configfs *tf = se_nacl->se_tpg->se_tpg_wwn->wwn_tf;
 393
 394         if (tf->tf_ops->fabric_cleanup_nodeacl)
 395                 tf->tf_ops->fabric_cleanup_nodeacl(se_nacl);
 396         core_tpg_del_initiator_node_acl(se_nacl);
 397 }
 398
 399 static struct configfs_item_operations target_fabric_nacl_base_item_ops = {
 400         .release                = target_fabric_nacl_base_release,
 401 };
 402
 403 static struct configfs_group_operations target_fabric_nacl_base_group_ops = {
 404         .make_group             = target_fabric_make_mappedlun,
 405         .drop_item              = target_fabric_drop_mappedlun,
 406 };
 407
 408 TF_CIT_SETUP_DRV(tpg_nacl_base, &target_fabric_nacl_base_item_ops,
 409                 &target_fabric_nacl_base_group_ops);
 410
 411 /* End of tfc_tpg_nacl_base_cit */
 412
 413 /* Start of tfc_node_fabric_stats_cit */
 414 /*
 415  * This is used as a placeholder for struct se_node_acl->acl_fabric_stat_group
 416  * to allow fabrics access to ->acl_fabric_stat_group->default_groups[]
 417  */
 418 TF_CIT_SETUP(tpg_nacl_stat, NULL, NULL, NULL);
 419
 420 /* End of tfc_wwn_fabric_stats_cit */
 421
 422 /* Start of tfc_tpg_nacl_cit */
 423
 424 static struct config_group *target_fabric_make_nodeacl(
 425         struct config_group *group,
 426         const char *name)
 427 {
 428         struct se_portal_group *se_tpg = container_of(group,
 429                         struct se_portal_group, tpg_acl_group);
 430         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 431         struct se_node_acl *se_nacl;
 432         struct config_group *nacl_cg;
 433
 434         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, name);
 435         if (IS_ERR(se_nacl))
 436                 return ERR_CAST(se_nacl);
 437
 438         if (tf->tf_ops->fabric_init_nodeacl) {
 439                 int ret = tf->tf_ops->fabric_init_nodeacl(se_nacl, name);
 440                 if (ret) {
 441                         core_tpg_del_initiator_node_acl(se_nacl);
 442                         return ERR_PTR(ret);
 443                 }
 444         }
 445
 446         nacl_cg = &se_nacl->acl_group;
 447         nacl_cg->default_groups = se_nacl->acl_default_groups;
 448         nacl_cg->default_groups[0] = &se_nacl->acl_attrib_group;
 449         nacl_cg->default_groups[1] = &se_nacl->acl_auth_group;
 450         nacl_cg->default_groups[2] = &se_nacl->acl_param_group;
 451         nacl_cg->default_groups[3] = &se_nacl->acl_fabric_stat_group;
 452         nacl_cg->default_groups[4] = NULL;
 453
 454         config_group_init_type_name(&se_nacl->acl_group, name,
 455                         &tf->tf_tpg_nacl_base_cit);
 456         config_group_init_type_name(&se_nacl->acl_attrib_group, "attrib",
 457                         &tf->tf_tpg_nacl_attrib_cit);
 458         config_group_init_type_name(&se_nacl->acl_auth_group, "auth",
 459                         &tf->tf_tpg_nacl_auth_cit);
 460         config_group_init_type_name(&se_nacl->acl_param_group, "param",
 461                         &tf->tf_tpg_nacl_param_cit);
 462         config_group_init_type_name(&se_nacl->acl_fabric_stat_group,
 463                         "fabric_statistics", &tf->tf_tpg_nacl_stat_cit);
 464
 465         return &se_nacl->acl_group;
 466 }
 467
 468 static void target_fabric_drop_nodeacl(
 469         struct config_group *group,
 470         struct config_item *item)
 471 {
 472         struct se_node_acl *se_nacl = container_of(to_config_group(item),
 473                         struct se_node_acl, acl_group);
 474         struct config_item *df_item;
 475         struct config_group *nacl_cg;
 476         int i;
 477
 478         nacl_cg = &se_nacl->acl_group;
 479         for (i = 0; nacl_cg->default_groups[i]; i++) {
 480                 df_item = &nacl_cg->default_groups[i]->cg_item;
 481                 nacl_cg->default_groups[i] = NULL;
 482                 config_item_put(df_item);
 483         }
 484         /*
 485          * struct se_node_acl free is done in target_fabric_nacl_base_release()
 486          */
 487         config_item_put(item);
 488 }
 489
 490 static struct configfs_group_operations target_fabric_nacl_group_ops = {
 491         .make_group     = target_fabric_make_nodeacl,
 492         .drop_item      = target_fabric_drop_nodeacl,
 493 };
 494
 495 TF_CIT_SETUP(tpg_nacl, NULL, &target_fabric_nacl_group_ops, NULL);
 496
 497 /* End of tfc_tpg_nacl_cit */
 498
 499 /* Start of tfc_tpg_np_base_cit */
 500
 501 static void target_fabric_np_base_release(struct config_item *item)
 502 {
 503         struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
 504                                 struct se_tpg_np, tpg_np_group);
 505         struct se_portal_group *se_tpg = se_tpg_np->tpg_np_parent;
 506         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 507
 508         tf->tf_ops->fabric_drop_np(se_tpg_np);
 509 }
 510
 511 static struct configfs_item_operations target_fabric_np_base_item_ops = {
 512         .release                = target_fabric_np_base_release,
 513 };
 514
 515 TF_CIT_SETUP_DRV(tpg_np_base, &target_fabric_np_base_item_ops, NULL);
 516
 517 /* End of tfc_tpg_np_base_cit */
 518
 519 /* Start of tfc_tpg_np_cit */
 520
 521 static struct config_group *target_fabric_make_np(
 522         struct config_group *group,
 523         const char *name)
 524 {
 525         struct se_portal_group *se_tpg = container_of(group,
 526                                 struct se_portal_group, tpg_np_group);
 527         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 528         struct se_tpg_np *se_tpg_np;
 529
 530         if (!tf->tf_ops->fabric_make_np) {
 531                 pr_err("tf->tf_ops.fabric_make_np is NULL\n");
 532                 return ERR_PTR(-ENOSYS);
 533         }
 534
 535         se_tpg_np = tf->tf_ops->fabric_make_np(se_tpg, group, name);
 536         if (!se_tpg_np || IS_ERR(se_tpg_np))
 537                 return ERR_PTR(-EINVAL);
 538
 539         se_tpg_np->tpg_np_parent = se_tpg;
 540         config_group_init_type_name(&se_tpg_np->tpg_np_group, name,
 541                         &tf->tf_tpg_np_base_cit);
 542
 543         return &se_tpg_np->tpg_np_group;
 544 }
 545
 546 static void target_fabric_drop_np(
 547         struct config_group *group,
 548         struct config_item *item)
 549 {
 550         /*
 551          * struct se_tpg_np is released via target_fabric_np_base_release()
 552          */
 553         config_item_put(item);
 554 }
 555
 556 static struct configfs_group_operations target_fabric_np_group_ops = {
 557         .make_group     = &target_fabric_make_np,
 558         .drop_item      = &target_fabric_drop_np,
 559 };
 560
 561 TF_CIT_SETUP(tpg_np, NULL, &target_fabric_np_group_ops, NULL);
 562
 563 /* End of tfc_tpg_np_cit */
 564
 565 /* Start of tfc_tpg_port_cit */
 566
 567 static struct se_lun *item_to_lun(struct config_item *item)
 568 {
 569         return container_of(to_config_group(item), struct se_lun,
 570                         lun_group);
 571 }
 572
 573 static ssize_t target_fabric_port_alua_tg_pt_gp_show(struct config_item *item,
 574                 char *page)
 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_show_tg_pt_gp_info(lun, page);
 582 }
 583
 584 static ssize_t target_fabric_port_alua_tg_pt_gp_store(struct config_item *item,
 585                 const char *page, size_t count)
 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_store_tg_pt_gp_info(lun, page, count);
 593 }
 594
 595 static ssize_t target_fabric_port_alua_tg_pt_offline_show(
 596                 struct config_item *item, char *page)
 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_show_offline_bit(lun, page);
 604 }
 605
 606 static ssize_t target_fabric_port_alua_tg_pt_offline_store(
 607                 struct config_item *item, const char *page, size_t count)
 608 {
 609         struct se_lun *lun = item_to_lun(item);
 610
 611         if (!lun || !lun->lun_se_dev)
 612                 return -ENODEV;
 613
 614         return core_alua_store_offline_bit(lun, page, count);
 615 }
 616
 617 static ssize_t target_fabric_port_alua_tg_pt_status_show(
 618                 struct config_item *item, char *page)
 619 {
 620         struct se_lun *lun = item_to_lun(item);
 621
 622         if (!lun || !lun->lun_se_dev)
 623                 return -ENODEV;
 624
 625         return core_alua_show_secondary_status(lun, page);
 626 }
 627
 628 static ssize_t target_fabric_port_alua_tg_pt_status_store(
 629                 struct config_item *item, const char *page, size_t count)
 630 {
 631         struct se_lun *lun = item_to_lun(item);
 632
 633         if (!lun || !lun->lun_se_dev)
 634                 return -ENODEV;
 635
 636         return core_alua_store_secondary_status(lun, page, count);
 637 }
 638
 639 static ssize_t target_fabric_port_alua_tg_pt_write_md_show(
 640                 struct config_item *item, char *page)
 641 {
 642         struct se_lun *lun = item_to_lun(item);
 643
 644         if (!lun || !lun->lun_se_dev)
 645                 return -ENODEV;
 646
 647         return core_alua_show_secondary_write_metadata(lun, page);
 648 }
 649
 650 static ssize_t target_fabric_port_alua_tg_pt_write_md_store(
 651                 struct config_item *item, const char *page, size_t count)
 652 {
 653         struct se_lun *lun = item_to_lun(item);
 654
 655         if (!lun || !lun->lun_se_dev)
 656                 return -ENODEV;
 657
 658         return core_alua_store_secondary_write_metadata(lun, page, count);
 659 }
 660
 661 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_gp);
 662 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_offline);
 663 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_status);
 664 CONFIGFS_ATTR(target_fabric_port_, alua_tg_pt_write_md);
 665
 666 static struct configfs_attribute *target_fabric_port_attrs[] = {
 667         &target_fabric_port_attr_alua_tg_pt_gp,
 668         &target_fabric_port_attr_alua_tg_pt_offline,
 669         &target_fabric_port_attr_alua_tg_pt_status,
 670         &target_fabric_port_attr_alua_tg_pt_write_md,
 671         NULL,
 672 };
 673
 674 static int target_fabric_port_link(
 675         struct config_item *lun_ci,
 676         struct config_item *se_dev_ci)
 677 {
 678         struct config_item *tpg_ci;
 679         struct se_lun *lun = container_of(to_config_group(lun_ci),
 680                                 struct se_lun, lun_group);
 681         struct se_portal_group *se_tpg;
 682         struct se_device *dev =
 683                 container_of(to_config_group(se_dev_ci), struct se_device, dev_group);
 684         struct target_fabric_configfs *tf;
 685         int ret;
 686
 687         if (dev->dev_link_magic != SE_DEV_LINK_MAGIC) {
 688                 pr_err("Bad dev->dev_link_magic, not a valid se_dev_ci pointer:"
 689                         " %p to struct se_device: %p\n", se_dev_ci, dev);
 690                 return -EFAULT;
 691         }
 692
 693         if (!(dev->dev_flags & DF_CONFIGURED)) {
 694                 pr_err("se_device not configured yet, cannot port link\n");
 695                 return -ENODEV;
 696         }
 697
 698         tpg_ci = &lun_ci->ci_parent->ci_group->cg_item;
 699         se_tpg = container_of(to_config_group(tpg_ci),
 700                                 struct se_portal_group, tpg_group);
 701         tf = se_tpg->se_tpg_wwn->wwn_tf;
 702
 703         if (lun->lun_se_dev !=  NULL) {
 704                 pr_err("Port Symlink already exists\n");
 705                 return -EEXIST;
 706         }
 707
 708         ret = core_dev_add_lun(se_tpg, dev, lun);
 709         if (ret) {
 710                 pr_err("core_dev_add_lun() failed: %d\n", ret);
 711                 goto out;
 712         }
 713
 714         if (tf->tf_ops->fabric_post_link) {
 715                 /*
 716                  * Call the optional fabric_post_link() to allow a
 717                  * fabric module to setup any additional state once
 718                  * core_dev_add_lun() has been called..
 719                  */
 720                 tf->tf_ops->fabric_post_link(se_tpg, lun);
 721         }
 722
 723         return 0;
 724 out:
 725         return ret;
 726 }
 727
 728 static int target_fabric_port_unlink(
 729         struct config_item *lun_ci,
 730         struct config_item *se_dev_ci)
 731 {
 732         struct se_lun *lun = container_of(to_config_group(lun_ci),
 733                                 struct se_lun, lun_group);
 734         struct se_portal_group *se_tpg = lun->lun_tpg;
 735         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 736
 737         if (tf->tf_ops->fabric_pre_unlink) {
 738                 /*
 739                  * Call the optional fabric_pre_unlink() to allow a
 740                  * fabric module to release any additional stat before
 741                  * core_dev_del_lun() is called.
 742                 */
 743                 tf->tf_ops->fabric_pre_unlink(se_tpg, lun);
 744         }
 745
 746         core_dev_del_lun(se_tpg, lun);
 747         return 0;
 748 }
 749
 750 static void target_fabric_port_release(struct config_item *item)
 751 {
 752         struct se_lun *lun = container_of(to_config_group(item),
 753                                           struct se_lun, lun_group);
 754
 755         kfree_rcu(lun, rcu_head);
 756 }
 757
 758 static struct configfs_item_operations target_fabric_port_item_ops = {
 759         .release                = target_fabric_port_release,
 760         .allow_link             = target_fabric_port_link,
 761         .drop_link              = target_fabric_port_unlink,
 762 };
 763
 764 TF_CIT_SETUP(tpg_port, &target_fabric_port_item_ops, NULL, target_fabric_port_attrs);
 765
 766 /* End of tfc_tpg_port_cit */
 767
 768 /* Start of tfc_tpg_port_stat_cit */
 769
 770 static struct config_group *target_core_port_stat_mkdir(
 771         struct config_group *group,
 772         const char *name)
 773 {
 774         return ERR_PTR(-ENOSYS);
 775 }
 776
 777 static void target_core_port_stat_rmdir(
 778         struct config_group *group,
 779         struct config_item *item)
 780 {
 781         return;
 782 }
 783
 784 static struct configfs_group_operations target_fabric_port_stat_group_ops = {
 785         .make_group             = target_core_port_stat_mkdir,
 786         .drop_item              = target_core_port_stat_rmdir,
 787 };
 788
 789 TF_CIT_SETUP(tpg_port_stat, NULL, &target_fabric_port_stat_group_ops, NULL);
 790
 791 /* End of tfc_tpg_port_stat_cit */
 792
 793 /* Start of tfc_tpg_lun_cit */
 794
 795 static struct config_group *target_fabric_make_lun(
 796         struct config_group *group,
 797         const char *name)
 798 {
 799         struct se_lun *lun;
 800         struct se_portal_group *se_tpg = container_of(group,
 801                         struct se_portal_group, tpg_lun_group);
 802         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
 803         struct config_group *lun_cg = NULL, *port_stat_grp = NULL;
 804         unsigned long long unpacked_lun;
 805         int errno;
 806
 807         if (strstr(name, "lun_") != name) {
 808                 pr_err("Unable to locate \'_\" in"
 809                                 " \"lun_$LUN_NUMBER\"\n");
 810                 return ERR_PTR(-EINVAL);
 811         }
 812         errno = kstrtoull(name + 4, 0, &unpacked_lun);
 813         if (errno)
 814                 return ERR_PTR(errno);
 815
 816         lun = core_tpg_alloc_lun(se_tpg, unpacked_lun);
 817         if (IS_ERR(lun))
 818                 return ERR_CAST(lun);
 819
 820         lun_cg = &lun->lun_group;
 821         lun_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
 822                                 GFP_KERNEL);
 823         if (!lun_cg->default_groups) {
 824                 pr_err("Unable to allocate lun_cg->default_groups\n");
 825                 kfree(lun);
 826                 return ERR_PTR(-ENOMEM);
 827         }
 828
 829         config_group_init_type_name(&lun->lun_group, name,
 830                         &tf->tf_tpg_port_cit);
 831         config_group_init_type_name(&lun->port_stat_grps.stat_group,
 832                         "statistics", &tf->tf_tpg_port_stat_cit);
 833         lun_cg->default_groups[0] = &lun->port_stat_grps.stat_group;
 834         lun_cg->default_groups[1] = NULL;
 835
 836         port_stat_grp = &lun->port_stat_grps.stat_group;
 837         port_stat_grp->default_groups =  kzalloc(sizeof(struct config_group *) * 4,
 838                                 GFP_KERNEL);
 839         if (!port_stat_grp->default_groups) {
 840                 pr_err("Unable to allocate port_stat_grp->default_groups\n");
 841                 kfree(lun_cg->default_groups);
 842                 kfree(lun);
 843                 return ERR_PTR(-ENOMEM);
 844         }
 845         target_stat_setup_port_default_groups(lun);
 846
 847         return &lun->lun_group;
 848 }
 849
 850 static void target_fabric_drop_lun(
 851         struct config_group *group,
 852         struct config_item *item)
 853 {
 854         struct se_lun *lun = container_of(to_config_group(item),
 855                                 struct se_lun, lun_group);
 856         struct config_item *df_item;
 857         struct config_group *lun_cg, *port_stat_grp;
 858         int i;
 859
 860         port_stat_grp = &lun->port_stat_grps.stat_group;
 861         for (i = 0; port_stat_grp->default_groups[i]; i++) {
 862                 df_item = &port_stat_grp->default_groups[i]->cg_item;
 863                 port_stat_grp->default_groups[i] = NULL;
 864                 config_item_put(df_item);
 865         }
 866         kfree(port_stat_grp->default_groups);
 867
 868         lun_cg = &lun->lun_group;
 869         for (i = 0; lun_cg->default_groups[i]; i++) {
 870                 df_item = &lun_cg->default_groups[i]->cg_item;
 871                 lun_cg->default_groups[i] = NULL;
 872                 config_item_put(df_item);
 873         }
 874         kfree(lun_cg->default_groups);
 875
 876         config_item_put(item);
 877 }
 878
 879 static struct configfs_group_operations target_fabric_lun_group_ops = {
 880         .make_group     = &target_fabric_make_lun,
 881         .drop_item      = &target_fabric_drop_lun,
 882 };
 883
 884 TF_CIT_SETUP(tpg_lun, NULL, &target_fabric_lun_group_ops, NULL);
 885
 886 /* End of tfc_tpg_lun_cit */
 887
 888 TF_CIT_SETUP_DRV(tpg_attrib, NULL, NULL);
 889 TF_CIT_SETUP_DRV(tpg_auth, NULL, NULL);
 890 TF_CIT_SETUP_DRV(tpg_param, NULL, NULL);
 891
 892 /* Start of tfc_tpg_base_cit */
 893
 894 static void target_fabric_tpg_release(struct config_item *item)
 895 {
 896         struct se_portal_group *se_tpg = container_of(to_config_group(item),
 897                         struct se_portal_group, tpg_group);
 898         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
 899         struct target_fabric_configfs *tf = wwn->wwn_tf;
 900
 901         tf->tf_ops->fabric_drop_tpg(se_tpg);
 902 }
 903
 904 static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
 905         .release                = target_fabric_tpg_release,
 906 };
 907
 908 TF_CIT_SETUP_DRV(tpg_base, &target_fabric_tpg_base_item_ops, NULL);
 909
 910 /* End of tfc_tpg_base_cit */
 911
 912 /* Start of tfc_tpg_cit */
 913
 914 static struct config_group *target_fabric_make_tpg(
 915         struct config_group *group,
 916         const char *name)
 917 {
 918         struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
 919         struct target_fabric_configfs *tf = wwn->wwn_tf;
 920         struct se_portal_group *se_tpg;
 921
 922         if (!tf->tf_ops->fabric_make_tpg) {
 923                 pr_err("tf->tf_ops->fabric_make_tpg is NULL\n");
 924                 return ERR_PTR(-ENOSYS);
 925         }
 926
 927         se_tpg = tf->tf_ops->fabric_make_tpg(wwn, group, name);
 928         if (!se_tpg || IS_ERR(se_tpg))
 929                 return ERR_PTR(-EINVAL);
 930         /*
 931          * Setup default groups from pre-allocated se_tpg->tpg_default_groups
 932          */
 933         se_tpg->tpg_group.default_groups = se_tpg->tpg_default_groups;
 934         se_tpg->tpg_group.default_groups[0] = &se_tpg->tpg_lun_group;
 935         se_tpg->tpg_group.default_groups[1] = &se_tpg->tpg_np_group;
 936         se_tpg->tpg_group.default_groups[2] = &se_tpg->tpg_acl_group;
 937         se_tpg->tpg_group.default_groups[3] = &se_tpg->tpg_attrib_group;
 938         se_tpg->tpg_group.default_groups[4] = &se_tpg->tpg_auth_group;
 939         se_tpg->tpg_group.default_groups[5] = &se_tpg->tpg_param_group;
 940         se_tpg->tpg_group.default_groups[6] = NULL;
 941
 942         config_group_init_type_name(&se_tpg->tpg_group, name,
 943                         &tf->tf_tpg_base_cit);
 944         config_group_init_type_name(&se_tpg->tpg_lun_group, "lun",
 945                         &tf->tf_tpg_lun_cit);
 946         config_group_init_type_name(&se_tpg->tpg_np_group, "np",
 947                         &tf->tf_tpg_np_cit);
 948         config_group_init_type_name(&se_tpg->tpg_acl_group, "acls",
 949                         &tf->tf_tpg_nacl_cit);
 950         config_group_init_type_name(&se_tpg->tpg_attrib_group, "attrib",
 951                         &tf->tf_tpg_attrib_cit);
 952         config_group_init_type_name(&se_tpg->tpg_auth_group, "auth",
 953                         &tf->tf_tpg_auth_cit);
 954         config_group_init_type_name(&se_tpg->tpg_param_group, "param",
 955                         &tf->tf_tpg_param_cit);
 956
 957         return &se_tpg->tpg_group;
 958 }
 959
 960 static void target_fabric_drop_tpg(
 961         struct config_group *group,
 962         struct config_item *item)
 963 {
 964         struct se_portal_group *se_tpg = container_of(to_config_group(item),
 965                                 struct se_portal_group, tpg_group);
 966         struct config_group *tpg_cg = &se_tpg->tpg_group;
 967         struct config_item *df_item;
 968         int i;
 969         /*
 970          * Release default groups, but do not release tpg_cg->default_groups
 971          * memory as it is statically allocated at se_tpg->tpg_default_groups.
 972          */
 973         for (i = 0; tpg_cg->default_groups[i]; i++) {
 974                 df_item = &tpg_cg->default_groups[i]->cg_item;
 975                 tpg_cg->default_groups[i] = NULL;
 976                 config_item_put(df_item);
 977         }
 978
 979         config_item_put(item);
 980 }
 981
 982 static void target_fabric_release_wwn(struct config_item *item)
 983 {
 984         struct se_wwn *wwn = container_of(to_config_group(item),
 985                                 struct se_wwn, wwn_group);
 986         struct target_fabric_configfs *tf = wwn->wwn_tf;
 987
 988         tf->tf_ops->fabric_drop_wwn(wwn);
 989 }
 990
 991 static struct configfs_item_operations target_fabric_tpg_item_ops = {
 992         .release        = target_fabric_release_wwn,
 993 };
 994
 995 static struct configfs_group_operations target_fabric_tpg_group_ops = {
 996         .make_group     = target_fabric_make_tpg,
 997         .drop_item      = target_fabric_drop_tpg,
 998 };
 999
1000 TF_CIT_SETUP(tpg, &target_fabric_tpg_item_ops, &target_fabric_tpg_group_ops,
1001                 NULL);
1002
1003 /* End of tfc_tpg_cit */
1004
1005 /* Start of tfc_wwn_fabric_stats_cit */
1006 /*
1007  * This is used as a placeholder for struct se_wwn->fabric_stat_group
1008  * to allow fabrics access to ->fabric_stat_group->default_groups[]
1009  */
1010 TF_CIT_SETUP(wwn_fabric_stats, NULL, NULL, NULL);
1011
1012 /* End of tfc_wwn_fabric_stats_cit */
1013
1014 /* Start of tfc_wwn_cit */
1015
1016 static struct config_group *target_fabric_make_wwn(
1017         struct config_group *group,
1018         const char *name)
1019 {
1020         struct target_fabric_configfs *tf = container_of(group,
1021                                 struct target_fabric_configfs, tf_group);
1022         struct se_wwn *wwn;
1023
1024         if (!tf->tf_ops->fabric_make_wwn) {
1025                 pr_err("tf->tf_ops.fabric_make_wwn is NULL\n");
1026                 return ERR_PTR(-ENOSYS);
1027         }
1028
1029         wwn = tf->tf_ops->fabric_make_wwn(tf, group, name);
1030         if (!wwn || IS_ERR(wwn))
1031                 return ERR_PTR(-EINVAL);
1032
1033         wwn->wwn_tf = tf;
1034         /*
1035          * Setup default groups from pre-allocated wwn->wwn_default_groups
1036          */
1037         wwn->wwn_group.default_groups = wwn->wwn_default_groups;
1038         wwn->wwn_group.default_groups[0] = &wwn->fabric_stat_group;
1039         wwn->wwn_group.default_groups[1] = NULL;
1040
1041         config_group_init_type_name(&wwn->wwn_group, name, &tf->tf_tpg_cit);
1042         config_group_init_type_name(&wwn->fabric_stat_group, "fabric_statistics",
1043                         &tf->tf_wwn_fabric_stats_cit);
1044
1045         return &wwn->wwn_group;
1046 }
1047
1048 static void target_fabric_drop_wwn(
1049         struct config_group *group,
1050         struct config_item *item)
1051 {
1052         struct se_wwn *wwn = container_of(to_config_group(item),
1053                                 struct se_wwn, wwn_group);
1054         struct config_item *df_item;
1055         struct config_group *cg = &wwn->wwn_group;
1056         int i;
1057
1058         for (i = 0; cg->default_groups[i]; i++) {
1059                 df_item = &cg->default_groups[i]->cg_item;
1060                 cg->default_groups[i] = NULL;
1061                 config_item_put(df_item);
1062         }
1063
1064         config_item_put(item);
1065 }
1066
1067 static struct configfs_group_operations target_fabric_wwn_group_ops = {
1068         .make_group     = target_fabric_make_wwn,
1069         .drop_item      = target_fabric_drop_wwn,
1070 };
1071
1072 TF_CIT_SETUP_DRV(wwn, NULL, &target_fabric_wwn_group_ops);
1073 TF_CIT_SETUP_DRV(discovery, NULL, NULL);
1074
1075 int target_fabric_setup_cits(struct target_fabric_configfs *tf)
1076 {
1077         target_fabric_setup_discovery_cit(tf);
1078         target_fabric_setup_wwn_cit(tf);
1079         target_fabric_setup_wwn_fabric_stats_cit(tf);
1080         target_fabric_setup_tpg_cit(tf);
1081         target_fabric_setup_tpg_base_cit(tf);
1082         target_fabric_setup_tpg_port_cit(tf);
1083         target_fabric_setup_tpg_port_stat_cit(tf);
1084         target_fabric_setup_tpg_lun_cit(tf);
1085         target_fabric_setup_tpg_np_cit(tf);
1086         target_fabric_setup_tpg_np_base_cit(tf);
1087         target_fabric_setup_tpg_attrib_cit(tf);
1088         target_fabric_setup_tpg_auth_cit(tf);
1089         target_fabric_setup_tpg_param_cit(tf);
1090         target_fabric_setup_tpg_nacl_cit(tf);
1091         target_fabric_setup_tpg_nacl_base_cit(tf);
1092         target_fabric_setup_tpg_nacl_attrib_cit(tf);
1093         target_fabric_setup_tpg_nacl_auth_cit(tf);
1094         target_fabric_setup_tpg_nacl_param_cit(tf);
1095         target_fabric_setup_tpg_nacl_stat_cit(tf);
1096         target_fabric_setup_tpg_mappedlun_cit(tf);
1097         target_fabric_setup_tpg_mappedlun_stat_cit(tf);
1098
1099         return 0;
1100 }