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_free_inode(struct inode *inode)
 128 {
 129         kmem_cache_free(orangefs_inode_cache, ORANGEFS_I(inode));
 130 }
 131
 132 static void orangefs_destroy_inode(struct inode *inode)
 133 {
 134         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 135
 136         gossip_debug(GOSSIP_SUPER_DEBUG,
 137                         "%s: deallocated %p destroying inode %pU\n",
 138                         __func__, orangefs_inode, get_khandle_from_ino(inode));
 139 }
 140
 141 /*
 142  * NOTE: information filled in here is typically reflected in the
 143  * output of the system command 'df'
 144 */
 145 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
 146 {
 147         int ret = -ENOMEM;
 148         struct orangefs_kernel_op_s *new_op = NULL;
 149         int flags = 0;
 150         struct super_block *sb = NULL;
 151
 152         sb = dentry->d_sb;
 153
 154         gossip_debug(GOSSIP_SUPER_DEBUG,
 155                         "%s: called on sb %p (fs_id is %d)\n",
 156                         __func__,
 157                         sb,
 158                         (int)(ORANGEFS_SB(sb)->fs_id));
 159
 160         new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
 161         if (!new_op)
 162                 return ret;
 163         new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
 164
 165         if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
 166                 flags = ORANGEFS_OP_INTERRUPTIBLE;
 167
 168         ret = service_operation(new_op, "orangefs_statfs", flags);
 169
 170         if (new_op->downcall.status < 0)
 171                 goto out_op_release;
 172
 173         gossip_debug(GOSSIP_SUPER_DEBUG,
 174                      "%s: got %ld blocks available | "
 175                      "%ld blocks total | %ld block size | "
 176                      "%ld files total | %ld files avail\n",
 177                      __func__,
 178                      (long)new_op->downcall.resp.statfs.blocks_avail,
 179                      (long)new_op->downcall.resp.statfs.blocks_total,
 180                      (long)new_op->downcall.resp.statfs.block_size,
 181                      (long)new_op->downcall.resp.statfs.files_total,
 182                      (long)new_op->downcall.resp.statfs.files_avail);
 183
 184         buf->f_type = sb->s_magic;
 185         memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
 186         buf->f_bsize = new_op->downcall.resp.statfs.block_size;
 187         buf->f_namelen = ORANGEFS_NAME_MAX;
 188
 189         buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
 190         buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 191         buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 192         buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
 193         buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
 194         buf->f_frsize = sb->s_blocksize;
 195
 196 out_op_release:
 197         op_release(new_op);
 198         gossip_debug(GOSSIP_SUPER_DEBUG, "%s: returning %d\n", __func__, ret);
 199         return ret;
 200 }
 201
 202 /*
 203  * Remount as initiated by VFS layer.  We just need to reparse the mount
 204  * options, no need to signal pvfs2-client-core about it.
 205  */
 206 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
 207 {
 208         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
 209         return parse_mount_options(sb, data, 1);
 210 }
 211
 212 /*
 213  * Remount as initiated by pvfs2-client-core on restart.  This is used to
 214  * repopulate mount information left from previous pvfs2-client-core.
 215  *
 216  * the idea here is that given a valid superblock, we're
 217  * re-initializing the user space client with the initial mount
 218  * information specified when the super block was first initialized.
 219  * this is very different than the first initialization/creation of a
 220  * superblock.  we use the special service_priority_operation to make
 221  * sure that the mount gets ahead of any other pending operation that
 222  * is waiting for servicing.  this means that the pvfs2-client won't
 223  * fail to start several times for all other pending operations before
 224  * the client regains all of the mount information from us.
 225  * NOTE: this function assumes that the request_mutex is already acquired!
 226  */
 227 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
 228 {
 229         struct orangefs_kernel_op_s *new_op;
 230         int ret = -EINVAL;
 231
 232         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
 233
 234         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 235         if (!new_op)
 236                 return -ENOMEM;
 237         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 238                 orangefs_sb->devname,
 239                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 240
 241         gossip_debug(GOSSIP_SUPER_DEBUG,
 242                      "Attempting ORANGEFS Remount via host %s\n",
 243                      new_op->upcall.req.fs_mount.orangefs_config_server);
 244
 245         /*
 246          * we assume that the calling function has already acquired the
 247          * request_mutex to prevent other operations from bypassing
 248          * this one
 249          */
 250         ret = service_operation(new_op, "orangefs_remount",
 251                 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 252         gossip_debug(GOSSIP_SUPER_DEBUG,
 253                      "orangefs_remount: mount got return value of %d\n",
 254                      ret);
 255         if (ret == 0) {
 256                 /*
 257                  * store the id assigned to this sb -- it's just a
 258                  * short-lived mapping that the system interface uses
 259                  * to map this superblock to a particular mount entry
 260                  */
 261                 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
 262                 orangefs_sb->mount_pending = 0;
 263         }
 264
 265         op_release(new_op);
 266
 267         if (orangefs_userspace_version >= 20906) {
 268                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 269                 if (!new_op)
 270                         return -ENOMEM;
 271                 new_op->upcall.req.features.features = 0;
 272                 ret = service_operation(new_op, "orangefs_features",
 273                     ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 274                 if (!ret)
 275                         orangefs_features =
 276                             new_op->downcall.resp.features.features;
 277                 else
 278                         orangefs_features = 0;
 279                 op_release(new_op);
 280         } else {
 281                 orangefs_features = 0;
 282         }
 283
 284         return ret;
 285 }
 286
 287 int fsid_key_table_initialize(void)
 288 {
 289         return 0;
 290 }
 291
 292 void fsid_key_table_finalize(void)
 293 {
 294 }
 295
 296 static const struct super_operations orangefs_s_ops = {
 297         .alloc_inode = orangefs_alloc_inode,
 298         .free_inode = orangefs_free_inode,
 299         .destroy_inode = orangefs_destroy_inode,
 300         .drop_inode = generic_delete_inode,
 301         .statfs = orangefs_statfs,
 302         .remount_fs = orangefs_remount_fs,
 303         .show_options = orangefs_show_options,
 304 };
 305
 306 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
 307                                   struct fid *fid,
 308                                   int fh_len,
 309                                   int fh_type)
 310 {
 311         struct orangefs_object_kref refn;
 312
 313         if (fh_len < 5 || fh_type > 2)
 314                 return NULL;
 315
 316         ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
 317         refn.fs_id = (u32) fid->raw[4];
 318         gossip_debug(GOSSIP_SUPER_DEBUG,
 319                      "fh_to_dentry: handle %pU, fs_id %d\n",
 320                      &refn.khandle,
 321                      refn.fs_id);
 322
 323         return d_obtain_alias(orangefs_iget(sb, &refn));
 324 }
 325
 326 static int orangefs_encode_fh(struct inode *inode,
 327                     __u32 *fh,
 328                     int *max_len,
 329                     struct inode *parent)
 330 {
 331         int len = parent ? 10 : 5;
 332         int type = 1;
 333         struct orangefs_object_kref refn;
 334
 335         if (*max_len < len) {
 336                 gossip_err("fh buffer is too small for encoding\n");
 337                 *max_len = len;
 338                 type = 255;
 339                 goto out;
 340         }
 341
 342         refn = ORANGEFS_I(inode)->refn;
 343         ORANGEFS_khandle_to(&refn.khandle, fh, 16);
 344         fh[4] = refn.fs_id;
 345
 346         gossip_debug(GOSSIP_SUPER_DEBUG,
 347                      "Encoding fh: handle %pU, fsid %u\n",
 348                      &refn.khandle,
 349                      refn.fs_id);
 350
 351
 352         if (parent) {
 353                 refn = ORANGEFS_I(parent)->refn;
 354                 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
 355                 fh[9] = refn.fs_id;
 356
 357                 type = 2;
 358                 gossip_debug(GOSSIP_SUPER_DEBUG,
 359                              "Encoding parent: handle %pU, fsid %u\n",
 360                              &refn.khandle,
 361                              refn.fs_id);
 362         }
 363         *max_len = len;
 364
 365 out:
 366         return type;
 367 }
 368
 369 static const struct export_operations orangefs_export_ops = {
 370         .encode_fh = orangefs_encode_fh,
 371         .fh_to_dentry = orangefs_fh_to_dentry,
 372 };
 373
 374 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
 375 {
 376         struct orangefs_kernel_op_s *op;
 377         int r;
 378         op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
 379         if (!op)
 380                 return -ENOMEM;
 381         op->upcall.req.fs_umount.id = id;
 382         op->upcall.req.fs_umount.fs_id = fs_id;
 383         strncpy(op->upcall.req.fs_umount.orangefs_config_server,
 384             devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 385         r = service_operation(op, "orangefs_fs_umount", 0);
 386         /* Not much to do about an error here. */
 387         if (r)
 388                 gossip_err("orangefs_unmount: service_operation %d\n", r);
 389         op_release(op);
 390         return r;
 391 }
 392
 393 static int orangefs_fill_sb(struct super_block *sb,
 394                 struct orangefs_fs_mount_response *fs_mount,
 395                 void *data, int silent)
 396 {
 397         int ret = -EINVAL;
 398         struct inode *root = NULL;
 399         struct dentry *root_dentry = NULL;
 400         struct orangefs_object_kref root_object;
 401
 402         /* alloc and init our private orangefs sb info */
 403         sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
 404         if (!ORANGEFS_SB(sb))
 405                 return -ENOMEM;
 406         ORANGEFS_SB(sb)->sb = sb;
 407
 408         ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
 409         ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
 410         ORANGEFS_SB(sb)->id = fs_mount->id;
 411
 412         if (data) {
 413                 ret = parse_mount_options(sb, data, silent);
 414                 if (ret)
 415                         return ret;
 416         }
 417
 418         /* Hang the xattr handlers off the superblock */
 419         sb->s_xattr = orangefs_xattr_handlers;
 420         sb->s_magic = ORANGEFS_SUPER_MAGIC;
 421         sb->s_op = &orangefs_s_ops;
 422         sb->s_d_op = &orangefs_dentry_operations;
 423
 424         sb->s_blocksize = PAGE_SIZE;
 425         sb->s_blocksize_bits = PAGE_SHIFT;
 426         sb->s_maxbytes = MAX_LFS_FILESIZE;
 427
 428         root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
 429         root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
 430         gossip_debug(GOSSIP_SUPER_DEBUG,
 431                      "get inode %pU, fsid %d\n",
 432                      &root_object.khandle,
 433                      root_object.fs_id);
 434
 435         root = orangefs_iget(sb, &root_object);
 436         if (IS_ERR(root))
 437                 return PTR_ERR(root);
 438
 439         gossip_debug(GOSSIP_SUPER_DEBUG,
 440                      "Allocated root inode [%p] with mode %x\n",
 441                      root,
 442                      root->i_mode);
 443
 444         /* allocates and places root dentry in dcache */
 445         root_dentry = d_make_root(root);
 446         if (!root_dentry)
 447                 return -ENOMEM;
 448
 449         sb->s_export_op = &orangefs_export_ops;
 450         sb->s_root = root_dentry;
 451         return 0;
 452 }
 453
 454 struct dentry *orangefs_mount(struct file_system_type *fst,
 455                            int flags,
 456                            const char *devname,
 457                            void *data)
 458 {
 459         int ret = -EINVAL;
 460         struct super_block *sb = ERR_PTR(-EINVAL);
 461         struct orangefs_kernel_op_s *new_op;
 462         struct dentry *d = ERR_PTR(-EINVAL);
 463
 464         gossip_debug(GOSSIP_SUPER_DEBUG,
 465                      "orangefs_mount: called with devname %s\n",
 466                      devname);
 467
 468         if (!devname) {
 469                 gossip_err("ERROR: device name not specified.\n");
 470                 return ERR_PTR(-EINVAL);
 471         }
 472
 473         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 474         if (!new_op)
 475                 return ERR_PTR(-ENOMEM);
 476
 477         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 478                 devname,
 479                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 480
 481         gossip_debug(GOSSIP_SUPER_DEBUG,
 482                      "Attempting ORANGEFS Mount via host %s\n",
 483                      new_op->upcall.req.fs_mount.orangefs_config_server);
 484
 485         ret = service_operation(new_op, "orangefs_mount", 0);
 486         gossip_debug(GOSSIP_SUPER_DEBUG,
 487                      "orangefs_mount: mount got return value of %d\n", ret);
 488         if (ret)
 489                 goto free_op;
 490
 491         if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
 492                 gossip_err("ERROR: Retrieved null fs_id\n");
 493                 ret = -EINVAL;
 494                 goto free_op;
 495         }
 496
 497         sb = sget(fst, NULL, set_anon_super, flags, NULL);
 498
 499         if (IS_ERR(sb)) {
 500                 d = ERR_CAST(sb);
 501                 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
 502                     new_op->downcall.resp.fs_mount.fs_id, devname);
 503                 goto free_op;
 504         }
 505
 506         ret = orangefs_fill_sb(sb,
 507               &new_op->downcall.resp.fs_mount, data,
 508               flags & SB_SILENT ? 1 : 0);
 509
 510         if (ret) {
 511                 d = ERR_PTR(ret);
 512                 goto free_sb_and_op;
 513         }
 514
 515         /*
 516          * on successful mount, store the devname and data
 517          * used
 518          */
 519         strncpy(ORANGEFS_SB(sb)->devname,
 520                 devname,
 521                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 522
 523         /* mount_pending must be cleared */
 524         ORANGEFS_SB(sb)->mount_pending = 0;
 525
 526         /*
 527          * finally, add this sb to our list of known orangefs
 528          * sb's
 529          */
 530         gossip_debug(GOSSIP_SUPER_DEBUG,
 531                      "Adding SB %p to orangefs superblocks\n",
 532                      ORANGEFS_SB(sb));
 533         spin_lock(&orangefs_superblocks_lock);
 534         list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
 535         spin_unlock(&orangefs_superblocks_lock);
 536         op_release(new_op);
 537
 538         /* Must be removed from the list now. */
 539         ORANGEFS_SB(sb)->no_list = 0;
 540
 541         if (orangefs_userspace_version >= 20906) {
 542                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 543                 if (!new_op)
 544                         return ERR_PTR(-ENOMEM);
 545                 new_op->upcall.req.features.features = 0;
 546                 ret = service_operation(new_op, "orangefs_features", 0);
 547                 orangefs_features = new_op->downcall.resp.features.features;
 548                 op_release(new_op);
 549         } else {
 550                 orangefs_features = 0;
 551         }
 552
 553         return dget(sb->s_root);
 554
 555 free_sb_and_op:
 556         /* Will call orangefs_kill_sb with sb not in list. */
 557         ORANGEFS_SB(sb)->no_list = 1;
 558         /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
 559         deactivate_locked_super(sb);
 560 free_op:
 561         gossip_err("orangefs_mount: mount request failed with %d\n", ret);
 562         if (ret == -EINVAL) {
 563                 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
 564                 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
 565         }
 566
 567         op_release(new_op);
 568
 569         return d;
 570 }
 571
 572 void orangefs_kill_sb(struct super_block *sb)
 573 {
 574         int r;
 575         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
 576
 577         /* provided sb cleanup */
 578         kill_anon_super(sb);
 579
 580         if (!ORANGEFS_SB(sb)) {
 581                 mutex_lock(&orangefs_request_mutex);
 582                 mutex_unlock(&orangefs_request_mutex);
 583                 return;
 584         }
 585         /*
 586          * issue the unmount to userspace to tell it to remove the
 587          * dynamic mount info it has for this superblock
 588          */
 589         r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
 590             ORANGEFS_SB(sb)->devname);
 591         if (!r)
 592                 ORANGEFS_SB(sb)->mount_pending = 1;
 593
 594         if (!ORANGEFS_SB(sb)->no_list) {
 595                 /* remove the sb from our list of orangefs specific sb's */
 596                 spin_lock(&orangefs_superblocks_lock);
 597                 /* not list_del_init */
 598                 __list_del_entry(&ORANGEFS_SB(sb)->list);
 599                 ORANGEFS_SB(sb)->list.prev = NULL;
 600                 spin_unlock(&orangefs_superblocks_lock);
 601         }
 602
 603         /*
 604          * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
 605          * gets completed before we free the dang thing.
 606          */
 607         mutex_lock(&orangefs_request_mutex);
 608         mutex_unlock(&orangefs_request_mutex);
 609
 610         /* free the orangefs superblock private data */
 611         kfree(ORANGEFS_SB(sb));
 612 }
 613
 614 int orangefs_inode_cache_initialize(void)
 615 {
 616         orangefs_inode_cache = kmem_cache_create_usercopy(
 617                                         "orangefs_inode_cache",
 618                                         sizeof(struct orangefs_inode_s),
 619                                         0,
 620                                         ORANGEFS_CACHE_CREATE_FLAGS,
 621                                         offsetof(struct orangefs_inode_s,
 622                                                 link_target),
 623                                         sizeof_field(struct orangefs_inode_s,
 624                                                 link_target),
 625                                         orangefs_inode_cache_ctor);
 626
 627         if (!orangefs_inode_cache) {
 628                 gossip_err("Cannot create orangefs_inode_cache\n");
 629                 return -ENOMEM;
 630         }
 631         return 0;
 632 }
 633
 634 int orangefs_inode_cache_finalize(void)
 635 {
 636         kmem_cache_destroy(orangefs_inode_cache);
 637         return 0;
 638 }