fs/orangefs/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) 2001 Clemson University and The University of Chicago
   4  *
   5  * See COPYING in top-level directory.
   6  */
   7
   8 #include "protocol.h"
   9 #include "orangefs-kernel.h"
  10 #include "orangefs-bufmap.h"
  11
  12 #include <linux/parser.h>
  13
  14 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
  15 static struct kmem_cache *orangefs_inode_cache;
  16
  17 /* list for storing orangefs specific superblocks in use */
  18 LIST_HEAD(orangefs_superblocks);
  19
  20 DEFINE_SPINLOCK(orangefs_superblocks_lock);
  21
  22 enum {
  23         Opt_intr,
  24         Opt_acl,
  25         Opt_local_lock,
  26
  27         Opt_err
  28 };
  29
  30 static const match_table_t tokens = {
  31         { Opt_acl,              "acl" },
  32         { Opt_intr,             "intr" },
  33         { Opt_local_lock,       "local_lock" },
  34         { Opt_err,      NULL }
  35 };
  36
  37 uint64_t orangefs_features;
  38
  39 static int orangefs_show_options(struct seq_file *m, struct dentry *root)
  40 {
  41         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb);
  42
  43         if (root->d_sb->s_flags & SB_POSIXACL)
  44                 seq_puts(m, ",acl");
  45         if (orangefs_sb->flags & ORANGEFS_OPT_INTR)
  46                 seq_puts(m, ",intr");
  47         if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK)
  48                 seq_puts(m, ",local_lock");
  49         return 0;
  50 }
  51
  52 static int parse_mount_options(struct super_block *sb, char *options,
  53                 int silent)
  54 {
  55         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
  56         substring_t args[MAX_OPT_ARGS];
  57         char *p;
  58
  59         /*
  60          * Force any potential flags that might be set from the mount
  61          * to zero, ie, initialize to unset.
  62          */
  63         sb->s_flags &= ~SB_POSIXACL;
  64         orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
  65         orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
  66
  67         while ((p = strsep(&options, ",")) != NULL) {
  68                 int token;
  69
  70                 if (!*p)
  71                         continue;
  72
  73                 token = match_token(p, tokens, args);
  74                 switch (token) {
  75                 case Opt_acl:
  76                         sb->s_flags |= SB_POSIXACL;
  77                         break;
  78                 case Opt_intr:
  79                         orangefs_sb->flags |= ORANGEFS_OPT_INTR;
  80                         break;
  81                 case Opt_local_lock:
  82                         orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
  83                         break;
  84                 default:
  85                         goto fail;
  86                 }
  87         }
  88
  89         return 0;
  90 fail:
  91         if (!silent)
  92                 gossip_err("Error: mount option [%s] is not supported.\n", p);
  93         return -EINVAL;
  94 }
  95
  96 static void orangefs_inode_cache_ctor(void *req)
  97 {
  98         struct orangefs_inode_s *orangefs_inode = req;
  99
 100         inode_init_once(&orangefs_inode->vfs_inode);
 101         init_rwsem(&orangefs_inode->xattr_sem);
 102 }
 103
 104 static struct inode *orangefs_alloc_inode(struct super_block *sb)
 105 {
 106         struct orangefs_inode_s *orangefs_inode;
 107
 108         orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
 109         if (!orangefs_inode)
 110                 return NULL;
 111
 112         /*
 113          * We want to clear everything except for rw_semaphore and the
 114          * vfs_inode.
 115          */
 116         memset(&orangefs_inode->refn.khandle, 0, 16);
 117         orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
 118         orangefs_inode->last_failed_block_index_read = 0;
 119         memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
 120
 121         gossip_debug(GOSSIP_SUPER_DEBUG,
 122                      "orangefs_alloc_inode: allocated %p\n",
 123                      &orangefs_inode->vfs_inode);
 124         return &orangefs_inode->vfs_inode;
 125 }
 126
 127 static void orangefs_i_callback(struct rcu_head *head)
 128 {
 129         struct inode *inode = container_of(head, struct inode, i_rcu);
 130         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 131         kmem_cache_free(orangefs_inode_cache, orangefs_inode);
 132 }
 133
 134 static void orangefs_destroy_inode(struct inode *inode)
 135 {
 136         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 137
 138         gossip_debug(GOSSIP_SUPER_DEBUG,
 139                         "%s: deallocated %p destroying inode %pU\n",
 140                         __func__, orangefs_inode, get_khandle_from_ino(inode));
 141
 142         call_rcu(&inode->i_rcu, orangefs_i_callback);
 143 }
 144
 145 /*
 146  * NOTE: information filled in here is typically reflected in the
 147  * output of the system command 'df'
 148 */
 149 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
 150 {
 151         int ret = -ENOMEM;
 152         struct orangefs_kernel_op_s *new_op = NULL;
 153         int flags = 0;
 154         struct super_block *sb = NULL;
 155
 156         sb = dentry->d_sb;
 157
 158         gossip_debug(GOSSIP_SUPER_DEBUG,
 159                      "orangefs_statfs: called on sb %p (fs_id is %d)\n",
 160                      sb,
 161                      (int)(ORANGEFS_SB(sb)->fs_id));
 162
 163         new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
 164         if (!new_op)
 165                 return ret;
 166         new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
 167
 168         if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
 169                 flags = ORANGEFS_OP_INTERRUPTIBLE;
 170
 171         ret = service_operation(new_op, "orangefs_statfs", flags);
 172
 173         if (new_op->downcall.status < 0)
 174                 goto out_op_release;
 175
 176         gossip_debug(GOSSIP_SUPER_DEBUG,
 177                      "%s: got %ld blocks available | "
 178                      "%ld blocks total | %ld block size | "
 179                      "%ld files total | %ld files avail\n",
 180                      __func__,
 181                      (long)new_op->downcall.resp.statfs.blocks_avail,
 182                      (long)new_op->downcall.resp.statfs.blocks_total,
 183                      (long)new_op->downcall.resp.statfs.block_size,
 184                      (long)new_op->downcall.resp.statfs.files_total,
 185                      (long)new_op->downcall.resp.statfs.files_avail);
 186
 187         buf->f_type = sb->s_magic;
 188         memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
 189         buf->f_bsize = new_op->downcall.resp.statfs.block_size;
 190         buf->f_namelen = ORANGEFS_NAME_MAX;
 191
 192         buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
 193         buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 194         buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 195         buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
 196         buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
 197         buf->f_frsize = sb->s_blocksize;
 198
 199 out_op_release:
 200         op_release(new_op);
 201         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
 202         return ret;
 203 }
 204
 205 /*
 206  * Remount as initiated by VFS layer.  We just need to reparse the mount
 207  * options, no need to signal pvfs2-client-core about it.
 208  */
 209 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
 210 {
 211         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
 212         return parse_mount_options(sb, data, 1);
 213 }
 214
 215 /*
 216  * Remount as initiated by pvfs2-client-core on restart.  This is used to
 217  * repopulate mount information left from previous pvfs2-client-core.
 218  *
 219  * the idea here is that given a valid superblock, we're
 220  * re-initializing the user space client with the initial mount
 221  * information specified when the super block was first initialized.
 222  * this is very different than the first initialization/creation of a
 223  * superblock.  we use the special service_priority_operation to make
 224  * sure that the mount gets ahead of any other pending operation that
 225  * is waiting for servicing.  this means that the pvfs2-client won't
 226  * fail to start several times for all other pending operations before
 227  * the client regains all of the mount information from us.
 228  * NOTE: this function assumes that the request_mutex is already acquired!
 229  */
 230 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
 231 {
 232         struct orangefs_kernel_op_s *new_op;
 233         int ret = -EINVAL;
 234
 235         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
 236
 237         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 238         if (!new_op)
 239                 return -ENOMEM;
 240         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 241                 orangefs_sb->devname,
 242                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 243
 244         gossip_debug(GOSSIP_SUPER_DEBUG,
 245                      "Attempting ORANGEFS Remount via host %s\n",
 246                      new_op->upcall.req.fs_mount.orangefs_config_server);
 247
 248         /*
 249          * we assume that the calling function has already acquired the
 250          * request_mutex to prevent other operations from bypassing
 251          * this one
 252          */
 253         ret = service_operation(new_op, "orangefs_remount",
 254                 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 255         gossip_debug(GOSSIP_SUPER_DEBUG,
 256                      "orangefs_remount: mount got return value of %d\n",
 257                      ret);
 258         if (ret == 0) {
 259                 /*
 260                  * store the id assigned to this sb -- it's just a
 261                  * short-lived mapping that the system interface uses
 262                  * to map this superblock to a particular mount entry
 263                  */
 264                 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
 265                 orangefs_sb->mount_pending = 0;
 266         }
 267
 268         op_release(new_op);
 269
 270         if (orangefs_userspace_version >= 20906) {
 271                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 272                 if (!new_op)
 273                         return -ENOMEM;
 274                 new_op->upcall.req.features.features = 0;
 275                 ret = service_operation(new_op, "orangefs_features",
 276                     ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 277                 if (!ret)
 278                         orangefs_features =
 279                             new_op->downcall.resp.features.features;
 280                 else
 281                         orangefs_features = 0;
 282                 op_release(new_op);
 283         } else {
 284                 orangefs_features = 0;
 285         }
 286
 287         return ret;
 288 }
 289
 290 int fsid_key_table_initialize(void)
 291 {
 292         return 0;
 293 }
 294
 295 void fsid_key_table_finalize(void)
 296 {
 297 }
 298
 299 static const struct super_operations orangefs_s_ops = {
 300         .alloc_inode = orangefs_alloc_inode,
 301         .destroy_inode = orangefs_destroy_inode,
 302         .drop_inode = generic_delete_inode,
 303         .statfs = orangefs_statfs,
 304         .remount_fs = orangefs_remount_fs,
 305         .show_options = orangefs_show_options,
 306 };
 307
 308 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
 309                                   struct fid *fid,
 310                                   int fh_len,
 311                                   int fh_type)
 312 {
 313         struct orangefs_object_kref refn;
 314
 315         if (fh_len < 5 || fh_type > 2)
 316                 return NULL;
 317
 318         ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
 319         refn.fs_id = (u32) fid->raw[4];
 320         gossip_debug(GOSSIP_SUPER_DEBUG,
 321                      "fh_to_dentry: handle %pU, fs_id %d\n",
 322                      &refn.khandle,
 323                      refn.fs_id);
 324
 325         return d_obtain_alias(orangefs_iget(sb, &refn));
 326 }
 327
 328 static int orangefs_encode_fh(struct inode *inode,
 329                     __u32 *fh,
 330                     int *max_len,
 331                     struct inode *parent)
 332 {
 333         int len = parent ? 10 : 5;
 334         int type = 1;
 335         struct orangefs_object_kref refn;
 336
 337         if (*max_len < len) {
 338                 gossip_err("fh buffer is too small for encoding\n");
 339                 *max_len = len;
 340                 type = 255;
 341                 goto out;
 342         }
 343
 344         refn = ORANGEFS_I(inode)->refn;
 345         ORANGEFS_khandle_to(&refn.khandle, fh, 16);
 346         fh[4] = refn.fs_id;
 347
 348         gossip_debug(GOSSIP_SUPER_DEBUG,
 349                      "Encoding fh: handle %pU, fsid %u\n",
 350                      &refn.khandle,
 351                      refn.fs_id);
 352
 353
 354         if (parent) {
 355                 refn = ORANGEFS_I(parent)->refn;
 356                 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
 357                 fh[9] = refn.fs_id;
 358
 359                 type = 2;
 360                 gossip_debug(GOSSIP_SUPER_DEBUG,
 361                              "Encoding parent: handle %pU, fsid %u\n",
 362                              &refn.khandle,
 363                              refn.fs_id);
 364         }
 365         *max_len = len;
 366
 367 out:
 368         return type;
 369 }
 370
 371 static const struct export_operations orangefs_export_ops = {
 372         .encode_fh = orangefs_encode_fh,
 373         .fh_to_dentry = orangefs_fh_to_dentry,
 374 };
 375
 376 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
 377 {
 378         struct orangefs_kernel_op_s *op;
 379         int r;
 380         op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
 381         if (!op)
 382                 return -ENOMEM;
 383         op->upcall.req.fs_umount.id = id;
 384         op->upcall.req.fs_umount.fs_id = fs_id;
 385         strncpy(op->upcall.req.fs_umount.orangefs_config_server,
 386             devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 387         r = service_operation(op, "orangefs_fs_umount", 0);
 388         /* Not much to do about an error here. */
 389         if (r)
 390                 gossip_err("orangefs_unmount: service_operation %d\n", r);
 391         op_release(op);
 392         return r;
 393 }
 394
 395 static int orangefs_fill_sb(struct super_block *sb,
 396                 struct orangefs_fs_mount_response *fs_mount,
 397                 void *data, int silent)
 398 {
 399         int ret = -EINVAL;
 400         struct inode *root = NULL;
 401         struct dentry *root_dentry = NULL;
 402         struct orangefs_object_kref root_object;
 403
 404         /* alloc and init our private orangefs sb info */
 405         sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
 406         if (!ORANGEFS_SB(sb))
 407                 return -ENOMEM;
 408         ORANGEFS_SB(sb)->sb = sb;
 409
 410         ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
 411         ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
 412         ORANGEFS_SB(sb)->id = fs_mount->id;
 413
 414         if (data) {
 415                 ret = parse_mount_options(sb, data, silent);
 416                 if (ret)
 417                         return ret;
 418         }
 419
 420         /* Hang the xattr handlers off the superblock */
 421         sb->s_xattr = orangefs_xattr_handlers;
 422         sb->s_magic = ORANGEFS_SUPER_MAGIC;
 423         sb->s_op = &orangefs_s_ops;
 424         sb->s_d_op = &orangefs_dentry_operations;
 425
 426         sb->s_blocksize = orangefs_bufmap_size_query();
 427         sb->s_blocksize_bits = orangefs_bufmap_shift_query();
 428         sb->s_maxbytes = MAX_LFS_FILESIZE;
 429
 430         root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
 431         root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
 432         gossip_debug(GOSSIP_SUPER_DEBUG,
 433                      "get inode %pU, fsid %d\n",
 434                      &root_object.khandle,
 435                      root_object.fs_id);
 436
 437         root = orangefs_iget(sb, &root_object);
 438         if (IS_ERR(root))
 439                 return PTR_ERR(root);
 440
 441         gossip_debug(GOSSIP_SUPER_DEBUG,
 442                      "Allocated root inode [%p] with mode %x\n",
 443                      root,
 444                      root->i_mode);
 445
 446         /* allocates and places root dentry in dcache */
 447         root_dentry = d_make_root(root);
 448         if (!root_dentry)
 449                 return -ENOMEM;
 450
 451         sb->s_export_op = &orangefs_export_ops;
 452         sb->s_root = root_dentry;
 453         return 0;
 454 }
 455
 456 struct dentry *orangefs_mount(struct file_system_type *fst,
 457                            int flags,
 458                            const char *devname,
 459                            void *data)
 460 {
 461         int ret = -EINVAL;
 462         struct super_block *sb = ERR_PTR(-EINVAL);
 463         struct orangefs_kernel_op_s *new_op;
 464         struct dentry *d = ERR_PTR(-EINVAL);
 465
 466         gossip_debug(GOSSIP_SUPER_DEBUG,
 467                      "orangefs_mount: called with devname %s\n",
 468                      devname);
 469
 470         if (!devname) {
 471                 gossip_err("ERROR: device name not specified.\n");
 472                 return ERR_PTR(-EINVAL);
 473         }
 474
 475         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 476         if (!new_op)
 477                 return ERR_PTR(-ENOMEM);
 478
 479         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 480                 devname,
 481                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 482
 483         gossip_debug(GOSSIP_SUPER_DEBUG,
 484                      "Attempting ORANGEFS Mount via host %s\n",
 485                      new_op->upcall.req.fs_mount.orangefs_config_server);
 486
 487         ret = service_operation(new_op, "orangefs_mount", 0);
 488         gossip_debug(GOSSIP_SUPER_DEBUG,
 489                      "orangefs_mount: mount got return value of %d\n", ret);
 490         if (ret)
 491                 goto free_op;
 492
 493         if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
 494                 gossip_err("ERROR: Retrieved null fs_id\n");
 495                 ret = -EINVAL;
 496                 goto free_op;
 497         }
 498
 499         sb = sget(fst, NULL, set_anon_super, flags, NULL);
 500
 501         if (IS_ERR(sb)) {
 502                 d = ERR_CAST(sb);
 503                 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
 504                     new_op->downcall.resp.fs_mount.fs_id, devname);
 505                 goto free_op;
 506         }
 507
 508         ret = orangefs_fill_sb(sb,
 509               &new_op->downcall.resp.fs_mount, data,
 510               flags & SB_SILENT ? 1 : 0);
 511
 512         if (ret) {
 513                 d = ERR_PTR(ret);
 514                 goto free_sb_and_op;
 515         }
 516
 517         /*
 518          * on successful mount, store the devname and data
 519          * used
 520          */
 521         strncpy(ORANGEFS_SB(sb)->devname,
 522                 devname,
 523                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 524
 525         /* mount_pending must be cleared */
 526         ORANGEFS_SB(sb)->mount_pending = 0;
 527
 528         /*
 529          * finally, add this sb to our list of known orangefs
 530          * sb's
 531          */
 532         gossip_debug(GOSSIP_SUPER_DEBUG,
 533                      "Adding SB %p to orangefs superblocks\n",
 534                      ORANGEFS_SB(sb));
 535         spin_lock(&orangefs_superblocks_lock);
 536         list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
 537         spin_unlock(&orangefs_superblocks_lock);
 538         op_release(new_op);
 539
 540         /* Must be removed from the list now. */
 541         ORANGEFS_SB(sb)->no_list = 0;
 542
 543         if (orangefs_userspace_version >= 20906) {
 544                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 545                 if (!new_op)
 546                         return ERR_PTR(-ENOMEM);
 547                 new_op->upcall.req.features.features = 0;
 548                 ret = service_operation(new_op, "orangefs_features", 0);
 549                 orangefs_features = new_op->downcall.resp.features.features;
 550                 op_release(new_op);
 551         } else {
 552                 orangefs_features = 0;
 553         }
 554
 555         return dget(sb->s_root);
 556
 557 free_sb_and_op:
 558         /* Will call orangefs_kill_sb with sb not in list. */
 559         ORANGEFS_SB(sb)->no_list = 1;
 560         /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
 561         deactivate_locked_super(sb);
 562 free_op:
 563         gossip_err("orangefs_mount: mount request failed with %d\n", ret);
 564         if (ret == -EINVAL) {
 565                 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
 566                 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
 567         }
 568
 569         op_release(new_op);
 570
 571         return d;
 572 }
 573
 574 void orangefs_kill_sb(struct super_block *sb)
 575 {
 576         int r;
 577         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
 578
 579         /* provided sb cleanup */
 580         kill_anon_super(sb);
 581
 582         /*
 583          * issue the unmount to userspace to tell it to remove the
 584          * dynamic mount info it has for this superblock
 585          */
 586         r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
 587             ORANGEFS_SB(sb)->devname);
 588         if (!r)
 589                 ORANGEFS_SB(sb)->mount_pending = 1;
 590
 591         if (!ORANGEFS_SB(sb)->no_list) {
 592                 /* remove the sb from our list of orangefs specific sb's */
 593                 spin_lock(&orangefs_superblocks_lock);
 594                 /* not list_del_init */
 595                 __list_del_entry(&ORANGEFS_SB(sb)->list);
 596                 ORANGEFS_SB(sb)->list.prev = NULL;
 597                 spin_unlock(&orangefs_superblocks_lock);
 598         }
 599
 600         /*
 601          * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
 602          * gets completed before we free the dang thing.
 603          */
 604         mutex_lock(&orangefs_request_mutex);
 605         mutex_unlock(&orangefs_request_mutex);
 606
 607         /* free the orangefs superblock private data */
 608         kfree(ORANGEFS_SB(sb));
 609 }
 610
 611 int orangefs_inode_cache_initialize(void)
 612 {
 613         orangefs_inode_cache = kmem_cache_create_usercopy(
 614                                         "orangefs_inode_cache",
 615                                         sizeof(struct orangefs_inode_s),
 616                                         0,
 617                                         ORANGEFS_CACHE_CREATE_FLAGS,
 618                                         offsetof(struct orangefs_inode_s,
 619                                                 link_target),
 620                                         sizeof_field(struct orangefs_inode_s,
 621                                                 link_target),
 622                                         orangefs_inode_cache_ctor);
 623
 624         if (!orangefs_inode_cache) {
 625                 gossip_err("Cannot create orangefs_inode_cache\n");
 626                 return -ENOMEM;
 627         }
 628         return 0;
 629 }
 630
 631 int orangefs_inode_cache_finalize(void)
 632 {
 633         kmem_cache_destroy(orangefs_inode_cache);
 634         return 0;
 635 }