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 #include <linux/hashtable.h>
  14
  15 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
  16 static struct kmem_cache *orangefs_inode_cache;
  17
  18 /* list for storing orangefs specific superblocks in use */
  19 LIST_HEAD(orangefs_superblocks);
  20
  21 DEFINE_SPINLOCK(orangefs_superblocks_lock);
  22
  23 enum {
  24         Opt_intr,
  25         Opt_acl,
  26         Opt_local_lock,
  27
  28         Opt_err
  29 };
  30
  31 static const match_table_t tokens = {
  32         { Opt_acl,              "acl" },
  33         { Opt_intr,             "intr" },
  34         { Opt_local_lock,       "local_lock" },
  35         { Opt_err,      NULL }
  36 };
  37
  38 uint64_t orangefs_features;
  39
  40 static int orangefs_show_options(struct seq_file *m, struct dentry *root)
  41 {
  42         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb);
  43
  44         if (root->d_sb->s_flags & SB_POSIXACL)
  45                 seq_puts(m, ",acl");
  46         if (orangefs_sb->flags & ORANGEFS_OPT_INTR)
  47                 seq_puts(m, ",intr");
  48         if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK)
  49                 seq_puts(m, ",local_lock");
  50         return 0;
  51 }
  52
  53 static int parse_mount_options(struct super_block *sb, char *options,
  54                 int silent)
  55 {
  56         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
  57         substring_t args[MAX_OPT_ARGS];
  58         char *p;
  59
  60         /*
  61          * Force any potential flags that might be set from the mount
  62          * to zero, ie, initialize to unset.
  63          */
  64         sb->s_flags &= ~SB_POSIXACL;
  65         orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
  66         orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
  67
  68         while ((p = strsep(&options, ",")) != NULL) {
  69                 int token;
  70
  71                 if (!*p)
  72                         continue;
  73
  74                 token = match_token(p, tokens, args);
  75                 switch (token) {
  76                 case Opt_acl:
  77                         sb->s_flags |= SB_POSIXACL;
  78                         break;
  79                 case Opt_intr:
  80                         orangefs_sb->flags |= ORANGEFS_OPT_INTR;
  81                         break;
  82                 case Opt_local_lock:
  83                         orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
  84                         break;
  85                 default:
  86                         goto fail;
  87                 }
  88         }
  89
  90         return 0;
  91 fail:
  92         if (!silent)
  93                 gossip_err("Error: mount option [%s] is not supported.\n", p);
  94         return -EINVAL;
  95 }
  96
  97 static void orangefs_inode_cache_ctor(void *req)
  98 {
  99         struct orangefs_inode_s *orangefs_inode = req;
 100
 101         inode_init_once(&orangefs_inode->vfs_inode);
 102         init_rwsem(&orangefs_inode->xattr_sem);
 103 }
 104
 105 static struct inode *orangefs_alloc_inode(struct super_block *sb)
 106 {
 107         struct orangefs_inode_s *orangefs_inode;
 108
 109         orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
 110         if (!orangefs_inode)
 111                 return NULL;
 112
 113         /*
 114          * We want to clear everything except for rw_semaphore and the
 115          * vfs_inode.
 116          */
 117         memset(&orangefs_inode->refn.khandle, 0, 16);
 118         orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
 119         orangefs_inode->last_failed_block_index_read = 0;
 120         memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
 121
 122         gossip_debug(GOSSIP_SUPER_DEBUG,
 123                      "orangefs_alloc_inode: allocated %p\n",
 124                      &orangefs_inode->vfs_inode);
 125         return &orangefs_inode->vfs_inode;
 126 }
 127
 128 static void orangefs_i_callback(struct rcu_head *head)
 129 {
 130         struct inode *inode = container_of(head, struct inode, i_rcu);
 131         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 132         struct orangefs_cached_xattr *cx;
 133         struct hlist_node *tmp;
 134         int i;
 135
 136         hash_for_each_safe(orangefs_inode->xattr_cache, i, tmp, cx, node) {
 137                 hlist_del(&cx->node);
 138                 kfree(cx);
 139         }
 140
 141         kmem_cache_free(orangefs_inode_cache, orangefs_inode);
 142 }
 143
 144 static void orangefs_destroy_inode(struct inode *inode)
 145 {
 146         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 147
 148         gossip_debug(GOSSIP_SUPER_DEBUG,
 149                         "%s: deallocated %p destroying inode %pU\n",
 150                         __func__, orangefs_inode, get_khandle_from_ino(inode));
 151
 152         call_rcu(&inode->i_rcu, orangefs_i_callback);
 153 }
 154
 155 /*
 156  * NOTE: information filled in here is typically reflected in the
 157  * output of the system command 'df'
 158 */
 159 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
 160 {
 161         int ret = -ENOMEM;
 162         struct orangefs_kernel_op_s *new_op = NULL;
 163         int flags = 0;
 164         struct super_block *sb = NULL;
 165
 166         sb = dentry->d_sb;
 167
 168         gossip_debug(GOSSIP_SUPER_DEBUG,
 169                         "%s: called on sb %p (fs_id is %d)\n",
 170                         __func__,
 171                         sb,
 172                         (int)(ORANGEFS_SB(sb)->fs_id));
 173
 174         new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
 175         if (!new_op)
 176                 return ret;
 177         new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
 178
 179         if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
 180                 flags = ORANGEFS_OP_INTERRUPTIBLE;
 181
 182         ret = service_operation(new_op, "orangefs_statfs", flags);
 183
 184         if (new_op->downcall.status < 0)
 185                 goto out_op_release;
 186
 187         gossip_debug(GOSSIP_SUPER_DEBUG,
 188                      "%s: got %ld blocks available | "
 189                      "%ld blocks total | %ld block size | "
 190                      "%ld files total | %ld files avail\n",
 191                      __func__,
 192                      (long)new_op->downcall.resp.statfs.blocks_avail,
 193                      (long)new_op->downcall.resp.statfs.blocks_total,
 194                      (long)new_op->downcall.resp.statfs.block_size,
 195                      (long)new_op->downcall.resp.statfs.files_total,
 196                      (long)new_op->downcall.resp.statfs.files_avail);
 197
 198         buf->f_type = sb->s_magic;
 199         memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
 200         buf->f_bsize = new_op->downcall.resp.statfs.block_size;
 201         buf->f_namelen = ORANGEFS_NAME_MAX;
 202
 203         buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
 204         buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 205         buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 206         buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
 207         buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
 208         buf->f_frsize = sb->s_blocksize;
 209
 210 out_op_release:
 211         op_release(new_op);
 212         gossip_debug(GOSSIP_SUPER_DEBUG, "%s: returning %d\n", __func__, ret);
 213         return ret;
 214 }
 215
 216 /*
 217  * Remount as initiated by VFS layer.  We just need to reparse the mount
 218  * options, no need to signal pvfs2-client-core about it.
 219  */
 220 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
 221 {
 222         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
 223         return parse_mount_options(sb, data, 1);
 224 }
 225
 226 /*
 227  * Remount as initiated by pvfs2-client-core on restart.  This is used to
 228  * repopulate mount information left from previous pvfs2-client-core.
 229  *
 230  * the idea here is that given a valid superblock, we're
 231  * re-initializing the user space client with the initial mount
 232  * information specified when the super block was first initialized.
 233  * this is very different than the first initialization/creation of a
 234  * superblock.  we use the special service_priority_operation to make
 235  * sure that the mount gets ahead of any other pending operation that
 236  * is waiting for servicing.  this means that the pvfs2-client won't
 237  * fail to start several times for all other pending operations before
 238  * the client regains all of the mount information from us.
 239  * NOTE: this function assumes that the request_mutex is already acquired!
 240  */
 241 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
 242 {
 243         struct orangefs_kernel_op_s *new_op;
 244         int ret = -EINVAL;
 245
 246         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
 247
 248         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 249         if (!new_op)
 250                 return -ENOMEM;
 251         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 252                 orangefs_sb->devname,
 253                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 254
 255         gossip_debug(GOSSIP_SUPER_DEBUG,
 256                      "Attempting ORANGEFS Remount via host %s\n",
 257                      new_op->upcall.req.fs_mount.orangefs_config_server);
 258
 259         /*
 260          * we assume that the calling function has already acquired the
 261          * request_mutex to prevent other operations from bypassing
 262          * this one
 263          */
 264         ret = service_operation(new_op, "orangefs_remount",
 265                 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 266         gossip_debug(GOSSIP_SUPER_DEBUG,
 267                      "orangefs_remount: mount got return value of %d\n",
 268                      ret);
 269         if (ret == 0) {
 270                 /*
 271                  * store the id assigned to this sb -- it's just a
 272                  * short-lived mapping that the system interface uses
 273                  * to map this superblock to a particular mount entry
 274                  */
 275                 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
 276                 orangefs_sb->mount_pending = 0;
 277         }
 278
 279         op_release(new_op);
 280
 281         if (orangefs_userspace_version >= 20906) {
 282                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 283                 if (!new_op)
 284                         return -ENOMEM;
 285                 new_op->upcall.req.features.features = 0;
 286                 ret = service_operation(new_op, "orangefs_features",
 287                     ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 288                 if (!ret)
 289                         orangefs_features =
 290                             new_op->downcall.resp.features.features;
 291                 else
 292                         orangefs_features = 0;
 293                 op_release(new_op);
 294         } else {
 295                 orangefs_features = 0;
 296         }
 297
 298         return ret;
 299 }
 300
 301 int fsid_key_table_initialize(void)
 302 {
 303         return 0;
 304 }
 305
 306 void fsid_key_table_finalize(void)
 307 {
 308 }
 309
 310 static const struct super_operations orangefs_s_ops = {
 311         .alloc_inode = orangefs_alloc_inode,
 312         .destroy_inode = orangefs_destroy_inode,
 313         .drop_inode = generic_delete_inode,
 314         .statfs = orangefs_statfs,
 315         .remount_fs = orangefs_remount_fs,
 316         .show_options = orangefs_show_options,
 317 };
 318
 319 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
 320                                   struct fid *fid,
 321                                   int fh_len,
 322                                   int fh_type)
 323 {
 324         struct orangefs_object_kref refn;
 325
 326         if (fh_len < 5 || fh_type > 2)
 327                 return NULL;
 328
 329         ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
 330         refn.fs_id = (u32) fid->raw[4];
 331         gossip_debug(GOSSIP_SUPER_DEBUG,
 332                      "fh_to_dentry: handle %pU, fs_id %d\n",
 333                      &refn.khandle,
 334                      refn.fs_id);
 335
 336         return d_obtain_alias(orangefs_iget(sb, &refn));
 337 }
 338
 339 static int orangefs_encode_fh(struct inode *inode,
 340                     __u32 *fh,
 341                     int *max_len,
 342                     struct inode *parent)
 343 {
 344         int len = parent ? 10 : 5;
 345         int type = 1;
 346         struct orangefs_object_kref refn;
 347
 348         if (*max_len < len) {
 349                 gossip_err("fh buffer is too small for encoding\n");
 350                 *max_len = len;
 351                 type = 255;
 352                 goto out;
 353         }
 354
 355         refn = ORANGEFS_I(inode)->refn;
 356         ORANGEFS_khandle_to(&refn.khandle, fh, 16);
 357         fh[4] = refn.fs_id;
 358
 359         gossip_debug(GOSSIP_SUPER_DEBUG,
 360                      "Encoding fh: handle %pU, fsid %u\n",
 361                      &refn.khandle,
 362                      refn.fs_id);
 363
 364
 365         if (parent) {
 366                 refn = ORANGEFS_I(parent)->refn;
 367                 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
 368                 fh[9] = refn.fs_id;
 369
 370                 type = 2;
 371                 gossip_debug(GOSSIP_SUPER_DEBUG,
 372                              "Encoding parent: handle %pU, fsid %u\n",
 373                              &refn.khandle,
 374                              refn.fs_id);
 375         }
 376         *max_len = len;
 377
 378 out:
 379         return type;
 380 }
 381
 382 static const struct export_operations orangefs_export_ops = {
 383         .encode_fh = orangefs_encode_fh,
 384         .fh_to_dentry = orangefs_fh_to_dentry,
 385 };
 386
 387 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
 388 {
 389         struct orangefs_kernel_op_s *op;
 390         int r;
 391         op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
 392         if (!op)
 393                 return -ENOMEM;
 394         op->upcall.req.fs_umount.id = id;
 395         op->upcall.req.fs_umount.fs_id = fs_id;
 396         strncpy(op->upcall.req.fs_umount.orangefs_config_server,
 397             devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 398         r = service_operation(op, "orangefs_fs_umount", 0);
 399         /* Not much to do about an error here. */
 400         if (r)
 401                 gossip_err("orangefs_unmount: service_operation %d\n", r);
 402         op_release(op);
 403         return r;
 404 }
 405
 406 static int orangefs_fill_sb(struct super_block *sb,
 407                 struct orangefs_fs_mount_response *fs_mount,
 408                 void *data, int silent)
 409 {
 410         int ret = -EINVAL;
 411         struct inode *root = NULL;
 412         struct dentry *root_dentry = NULL;
 413         struct orangefs_object_kref root_object;
 414
 415         /* alloc and init our private orangefs sb info */
 416         sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
 417         if (!ORANGEFS_SB(sb))
 418                 return -ENOMEM;
 419         ORANGEFS_SB(sb)->sb = sb;
 420
 421         ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
 422         ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
 423         ORANGEFS_SB(sb)->id = fs_mount->id;
 424
 425         if (data) {
 426                 ret = parse_mount_options(sb, data, silent);
 427                 if (ret)
 428                         return ret;
 429         }
 430
 431         /* Hang the xattr handlers off the superblock */
 432         sb->s_xattr = orangefs_xattr_handlers;
 433         sb->s_magic = ORANGEFS_SUPER_MAGIC;
 434         sb->s_op = &orangefs_s_ops;
 435         sb->s_d_op = &orangefs_dentry_operations;
 436
 437         sb->s_blocksize = PAGE_SIZE;
 438         sb->s_blocksize_bits = PAGE_SHIFT;
 439         sb->s_maxbytes = MAX_LFS_FILESIZE;
 440
 441         root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
 442         root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
 443         gossip_debug(GOSSIP_SUPER_DEBUG,
 444                      "get inode %pU, fsid %d\n",
 445                      &root_object.khandle,
 446                      root_object.fs_id);
 447
 448         root = orangefs_iget(sb, &root_object);
 449         if (IS_ERR(root))
 450                 return PTR_ERR(root);
 451
 452         gossip_debug(GOSSIP_SUPER_DEBUG,
 453                      "Allocated root inode [%p] with mode %x\n",
 454                      root,
 455                      root->i_mode);
 456
 457         /* allocates and places root dentry in dcache */
 458         root_dentry = d_make_root(root);
 459         if (!root_dentry)
 460                 return -ENOMEM;
 461
 462         sb->s_export_op = &orangefs_export_ops;
 463         sb->s_root = root_dentry;
 464         return 0;
 465 }
 466
 467 struct dentry *orangefs_mount(struct file_system_type *fst,
 468                            int flags,
 469                            const char *devname,
 470                            void *data)
 471 {
 472         int ret = -EINVAL;
 473         struct super_block *sb = ERR_PTR(-EINVAL);
 474         struct orangefs_kernel_op_s *new_op;
 475         struct dentry *d = ERR_PTR(-EINVAL);
 476
 477         gossip_debug(GOSSIP_SUPER_DEBUG,
 478                      "orangefs_mount: called with devname %s\n",
 479                      devname);
 480
 481         if (!devname) {
 482                 gossip_err("ERROR: device name not specified.\n");
 483                 return ERR_PTR(-EINVAL);
 484         }
 485
 486         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 487         if (!new_op)
 488                 return ERR_PTR(-ENOMEM);
 489
 490         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 491                 devname,
 492                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 493
 494         gossip_debug(GOSSIP_SUPER_DEBUG,
 495                      "Attempting ORANGEFS Mount via host %s\n",
 496                      new_op->upcall.req.fs_mount.orangefs_config_server);
 497
 498         ret = service_operation(new_op, "orangefs_mount", 0);
 499         gossip_debug(GOSSIP_SUPER_DEBUG,
 500                      "orangefs_mount: mount got return value of %d\n", ret);
 501         if (ret)
 502                 goto free_op;
 503
 504         if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
 505                 gossip_err("ERROR: Retrieved null fs_id\n");
 506                 ret = -EINVAL;
 507                 goto free_op;
 508         }
 509
 510         sb = sget(fst, NULL, set_anon_super, flags, NULL);
 511
 512         if (IS_ERR(sb)) {
 513                 d = ERR_CAST(sb);
 514                 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
 515                     new_op->downcall.resp.fs_mount.fs_id, devname);
 516                 goto free_op;
 517         }
 518
 519         ret = orangefs_fill_sb(sb,
 520               &new_op->downcall.resp.fs_mount, data,
 521               flags & SB_SILENT ? 1 : 0);
 522
 523         if (ret) {
 524                 d = ERR_PTR(ret);
 525                 goto free_sb_and_op;
 526         }
 527
 528         /*
 529          * on successful mount, store the devname and data
 530          * used
 531          */
 532         strncpy(ORANGEFS_SB(sb)->devname,
 533                 devname,
 534                 ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
 535
 536         /* mount_pending must be cleared */
 537         ORANGEFS_SB(sb)->mount_pending = 0;
 538
 539         /*
 540          * finally, add this sb to our list of known orangefs
 541          * sb's
 542          */
 543         gossip_debug(GOSSIP_SUPER_DEBUG,
 544                      "Adding SB %p to orangefs superblocks\n",
 545                      ORANGEFS_SB(sb));
 546         spin_lock(&orangefs_superblocks_lock);
 547         list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
 548         spin_unlock(&orangefs_superblocks_lock);
 549         op_release(new_op);
 550
 551         /* Must be removed from the list now. */
 552         ORANGEFS_SB(sb)->no_list = 0;
 553
 554         if (orangefs_userspace_version >= 20906) {
 555                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 556                 if (!new_op)
 557                         return ERR_PTR(-ENOMEM);
 558                 new_op->upcall.req.features.features = 0;
 559                 ret = service_operation(new_op, "orangefs_features", 0);
 560                 orangefs_features = new_op->downcall.resp.features.features;
 561                 op_release(new_op);
 562         } else {
 563                 orangefs_features = 0;
 564         }
 565
 566         return dget(sb->s_root);
 567
 568 free_sb_and_op:
 569         /* Will call orangefs_kill_sb with sb not in list. */
 570         ORANGEFS_SB(sb)->no_list = 1;
 571         /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
 572         deactivate_locked_super(sb);
 573 free_op:
 574         gossip_err("orangefs_mount: mount request failed with %d\n", ret);
 575         if (ret == -EINVAL) {
 576                 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
 577                 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
 578         }
 579
 580         op_release(new_op);
 581
 582         return d;
 583 }
 584
 585 void orangefs_kill_sb(struct super_block *sb)
 586 {
 587         int r;
 588         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
 589
 590         /* provided sb cleanup */
 591         kill_anon_super(sb);
 592
 593         if (!ORANGEFS_SB(sb)) {
 594                 mutex_lock(&orangefs_request_mutex);
 595                 mutex_unlock(&orangefs_request_mutex);
 596                 return;
 597         }
 598         /*
 599          * issue the unmount to userspace to tell it to remove the
 600          * dynamic mount info it has for this superblock
 601          */
 602         r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
 603             ORANGEFS_SB(sb)->devname);
 604         if (!r)
 605                 ORANGEFS_SB(sb)->mount_pending = 1;
 606
 607         if (!ORANGEFS_SB(sb)->no_list) {
 608                 /* remove the sb from our list of orangefs specific sb's */
 609                 spin_lock(&orangefs_superblocks_lock);
 610                 /* not list_del_init */
 611                 __list_del_entry(&ORANGEFS_SB(sb)->list);
 612                 ORANGEFS_SB(sb)->list.prev = NULL;
 613                 spin_unlock(&orangefs_superblocks_lock);
 614         }
 615
 616         /*
 617          * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
 618          * gets completed before we free the dang thing.
 619          */
 620         mutex_lock(&orangefs_request_mutex);
 621         mutex_unlock(&orangefs_request_mutex);
 622
 623         /* free the orangefs superblock private data */
 624         kfree(ORANGEFS_SB(sb));
 625 }
 626
 627 int orangefs_inode_cache_initialize(void)
 628 {
 629         orangefs_inode_cache = kmem_cache_create_usercopy(
 630                                         "orangefs_inode_cache",
 631                                         sizeof(struct orangefs_inode_s),
 632                                         0,
 633                                         ORANGEFS_CACHE_CREATE_FLAGS,
 634                                         offsetof(struct orangefs_inode_s,
 635                                                 link_target),
 636                                         sizeof_field(struct orangefs_inode_s,
 637                                                 link_target),
 638                                         orangefs_inode_cache_ctor);
 639
 640         if (!orangefs_inode_cache) {
 641                 gossip_err("Cannot create orangefs_inode_cache\n");
 642                 return -ENOMEM;
 643         }
 644         return 0;
 645 }
 646
 647 int orangefs_inode_cache_finalize(void)
 648 {
 649         kmem_cache_destroy(orangefs_inode_cache);
 650         return 0;
 651 }