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