fs/orangefs/super.c

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 #include "protocol.h"
   8 #include "orangefs-kernel.h"
   9 #include "orangefs-bufmap.h"
  10
  11 #include <linux/parser.h>
  12
  13 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
  14 static struct kmem_cache *orangefs_inode_cache;
  15
  16 /* list for storing orangefs specific superblocks in use */
  17 LIST_HEAD(orangefs_superblocks);
  18
  19 DEFINE_SPINLOCK(orangefs_superblocks_lock);
  20
  21 enum {
  22         Opt_intr,
  23         Opt_acl,
  24         Opt_local_lock,
  25
  26         Opt_err
  27 };
  28
  29 static const match_table_t tokens = {
  30         { Opt_acl,              "acl" },
  31         { Opt_intr,             "intr" },
  32         { Opt_local_lock,       "local_lock" },
  33         { Opt_err,      NULL }
  34 };
  35
  36 uint64_t orangefs_features;
  37
  38 static int orangefs_show_options(struct seq_file *m, struct dentry *root)
  39 {
  40         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb);
  41
  42         if (root->d_sb->s_flags & MS_POSIXACL)
  43                 seq_puts(m, ",acl");
  44         if (orangefs_sb->flags & ORANGEFS_OPT_INTR)
  45                 seq_puts(m, ",intr");
  46         if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK)
  47                 seq_puts(m, ",local_lock");
  48         return 0;
  49 }
  50
  51 static int parse_mount_options(struct super_block *sb, char *options,
  52                 int silent)
  53 {
  54         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
  55         substring_t args[MAX_OPT_ARGS];
  56         char *p;
  57
  58         /*
  59          * Force any potential flags that might be set from the mount
  60          * to zero, ie, initialize to unset.
  61          */
  62         sb->s_flags &= ~MS_POSIXACL;
  63         orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
  64         orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
  65
  66         while ((p = strsep(&options, ",")) != NULL) {
  67                 int token;
  68
  69                 if (!*p)
  70                         continue;
  71
  72                 token = match_token(p, tokens, args);
  73                 switch (token) {
  74                 case Opt_acl:
  75                         sb->s_flags |= MS_POSIXACL;
  76                         break;
  77                 case Opt_intr:
  78                         orangefs_sb->flags |= ORANGEFS_OPT_INTR;
  79                         break;
  80                 case Opt_local_lock:
  81                         orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
  82                         break;
  83                 default:
  84                         goto fail;
  85                 }
  86         }
  87
  88         return 0;
  89 fail:
  90         if (!silent)
  91                 gossip_err("Error: mount option [%s] is not supported.\n", p);
  92         return -EINVAL;
  93 }
  94
  95 static void orangefs_inode_cache_ctor(void *req)
  96 {
  97         struct orangefs_inode_s *orangefs_inode = req;
  98
  99         inode_init_once(&orangefs_inode->vfs_inode);
 100         init_rwsem(&orangefs_inode->xattr_sem);
 101
 102         orangefs_inode->vfs_inode.i_version = 1;
 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 == NULL) {
 111                 gossip_err("Failed to allocate orangefs_inode\n");
 112                 return NULL;
 113         }
 114
 115         /*
 116          * We want to clear everything except for rw_semaphore and the
 117          * vfs_inode.
 118          */
 119         memset(&orangefs_inode->refn.khandle, 0, 16);
 120         orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
 121         orangefs_inode->last_failed_block_index_read = 0;
 122         memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
 123         orangefs_inode->pinode_flags = 0;
 124
 125         gossip_debug(GOSSIP_SUPER_DEBUG,
 126                      "orangefs_alloc_inode: allocated %p\n",
 127                      &orangefs_inode->vfs_inode);
 128         return &orangefs_inode->vfs_inode;
 129 }
 130
 131 static void orangefs_i_callback(struct rcu_head *head)
 132 {
 133         struct inode *inode = container_of(head, struct inode, i_rcu);
 134         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 135         kmem_cache_free(orangefs_inode_cache, orangefs_inode);
 136 }
 137
 138 static void orangefs_destroy_inode(struct inode *inode)
 139 {
 140         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 141
 142         gossip_debug(GOSSIP_SUPER_DEBUG,
 143                         "%s: deallocated %p destroying inode %pU\n",
 144                         __func__, orangefs_inode, get_khandle_from_ino(inode));
 145
 146         call_rcu(&inode->i_rcu, orangefs_i_callback);
 147 }
 148
 149 /*
 150  * NOTE: information filled in here is typically reflected in the
 151  * output of the system command 'df'
 152 */
 153 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
 154 {
 155         int ret = -ENOMEM;
 156         struct orangefs_kernel_op_s *new_op = NULL;
 157         int flags = 0;
 158         struct super_block *sb = NULL;
 159
 160         sb = dentry->d_sb;
 161
 162         gossip_debug(GOSSIP_SUPER_DEBUG,
 163                      "orangefs_statfs: called on sb %p (fs_id is %d)\n",
 164                      sb,
 165                      (int)(ORANGEFS_SB(sb)->fs_id));
 166
 167         new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
 168         if (!new_op)
 169                 return ret;
 170         new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
 171
 172         if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
 173                 flags = ORANGEFS_OP_INTERRUPTIBLE;
 174
 175         ret = service_operation(new_op, "orangefs_statfs", flags);
 176
 177         if (new_op->downcall.status < 0)
 178                 goto out_op_release;
 179
 180         gossip_debug(GOSSIP_SUPER_DEBUG,
 181                      "%s: got %ld blocks available | "
 182                      "%ld blocks total | %ld block size | "
 183                      "%ld files total | %ld files avail\n",
 184                      __func__,
 185                      (long)new_op->downcall.resp.statfs.blocks_avail,
 186                      (long)new_op->downcall.resp.statfs.blocks_total,
 187                      (long)new_op->downcall.resp.statfs.block_size,
 188                      (long)new_op->downcall.resp.statfs.files_total,
 189                      (long)new_op->downcall.resp.statfs.files_avail);
 190
 191         buf->f_type = sb->s_magic;
 192         memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
 193         buf->f_bsize = new_op->downcall.resp.statfs.block_size;
 194         buf->f_namelen = ORANGEFS_NAME_MAX;
 195
 196         buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
 197         buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 198         buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
 199         buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
 200         buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
 201         buf->f_frsize = sb->s_blocksize;
 202
 203 out_op_release:
 204         op_release(new_op);
 205         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
 206         return ret;
 207 }
 208
 209 /*
 210  * Remount as initiated by VFS layer.  We just need to reparse the mount
 211  * options, no need to signal pvfs2-client-core about it.
 212  */
 213 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
 214 {
 215         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
 216         return parse_mount_options(sb, data, 1);
 217 }
 218
 219 /*
 220  * Remount as initiated by pvfs2-client-core on restart.  This is used to
 221  * repopulate mount information left from previous pvfs2-client-core.
 222  *
 223  * the idea here is that given a valid superblock, we're
 224  * re-initializing the user space client with the initial mount
 225  * information specified when the super block was first initialized.
 226  * this is very different than the first initialization/creation of a
 227  * superblock.  we use the special service_priority_operation to make
 228  * sure that the mount gets ahead of any other pending operation that
 229  * is waiting for servicing.  this means that the pvfs2-client won't
 230  * fail to start several times for all other pending operations before
 231  * the client regains all of the mount information from us.
 232  * NOTE: this function assumes that the request_mutex is already acquired!
 233  */
 234 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
 235 {
 236         struct orangefs_kernel_op_s *new_op;
 237         int ret = -EINVAL;
 238
 239         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
 240
 241         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 242         if (!new_op)
 243                 return -ENOMEM;
 244         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 245                 orangefs_sb->devname,
 246                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 247
 248         gossip_debug(GOSSIP_SUPER_DEBUG,
 249                      "Attempting ORANGEFS Remount via host %s\n",
 250                      new_op->upcall.req.fs_mount.orangefs_config_server);
 251
 252         /*
 253          * we assume that the calling function has already acquired the
 254          * request_mutex to prevent other operations from bypassing
 255          * this one
 256          */
 257         ret = service_operation(new_op, "orangefs_remount",
 258                 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 259         gossip_debug(GOSSIP_SUPER_DEBUG,
 260                      "orangefs_remount: mount got return value of %d\n",
 261                      ret);
 262         if (ret == 0) {
 263                 /*
 264                  * store the id assigned to this sb -- it's just a
 265                  * short-lived mapping that the system interface uses
 266                  * to map this superblock to a particular mount entry
 267                  */
 268                 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
 269                 orangefs_sb->mount_pending = 0;
 270         }
 271
 272         op_release(new_op);
 273
 274         if (orangefs_userspace_version >= 20906) {
 275                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 276                 if (!new_op)
 277                         return -ENOMEM;
 278                 new_op->upcall.req.features.features = 0;
 279                 ret = service_operation(new_op, "orangefs_features",
 280                     ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
 281                 if (!ret)
 282                         orangefs_features =
 283                             new_op->downcall.resp.features.features;
 284                 else
 285                         orangefs_features = 0;
 286                 op_release(new_op);
 287         } else {
 288                 orangefs_features = 0;
 289         }
 290
 291         return ret;
 292 }
 293
 294 int fsid_key_table_initialize(void)
 295 {
 296         return 0;
 297 }
 298
 299 void fsid_key_table_finalize(void)
 300 {
 301 }
 302
 303 /* Called whenever the VFS dirties the inode in response to atime updates */
 304 static void orangefs_dirty_inode(struct inode *inode, int flags)
 305 {
 306         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 307
 308         gossip_debug(GOSSIP_SUPER_DEBUG,
 309                      "orangefs_dirty_inode: %pU\n",
 310                      get_khandle_from_ino(inode));
 311         SetAtimeFlag(orangefs_inode);
 312 }
 313
 314 static const struct super_operations orangefs_s_ops = {
 315         .alloc_inode = orangefs_alloc_inode,
 316         .destroy_inode = orangefs_destroy_inode,
 317         .dirty_inode = orangefs_dirty_inode,
 318         .drop_inode = generic_delete_inode,
 319         .statfs = orangefs_statfs,
 320         .remount_fs = orangefs_remount_fs,
 321         .show_options = orangefs_show_options,
 322 };
 323
 324 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
 325                                   struct fid *fid,
 326                                   int fh_len,
 327                                   int fh_type)
 328 {
 329         struct orangefs_object_kref refn;
 330
 331         if (fh_len < 5 || fh_type > 2)
 332                 return NULL;
 333
 334         ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
 335         refn.fs_id = (u32) fid->raw[4];
 336         gossip_debug(GOSSIP_SUPER_DEBUG,
 337                      "fh_to_dentry: handle %pU, fs_id %d\n",
 338                      &refn.khandle,
 339                      refn.fs_id);
 340
 341         return d_obtain_alias(orangefs_iget(sb, &refn));
 342 }
 343
 344 static int orangefs_encode_fh(struct inode *inode,
 345                     __u32 *fh,
 346                     int *max_len,
 347                     struct inode *parent)
 348 {
 349         int len = parent ? 10 : 5;
 350         int type = 1;
 351         struct orangefs_object_kref refn;
 352
 353         if (*max_len < len) {
 354                 gossip_lerr("fh buffer is too small for encoding\n");
 355                 *max_len = len;
 356                 type = 255;
 357                 goto out;
 358         }
 359
 360         refn = ORANGEFS_I(inode)->refn;
 361         ORANGEFS_khandle_to(&refn.khandle, fh, 16);
 362         fh[4] = refn.fs_id;
 363
 364         gossip_debug(GOSSIP_SUPER_DEBUG,
 365                      "Encoding fh: handle %pU, fsid %u\n",
 366                      &refn.khandle,
 367                      refn.fs_id);
 368
 369
 370         if (parent) {
 371                 refn = ORANGEFS_I(parent)->refn;
 372                 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
 373                 fh[9] = refn.fs_id;
 374
 375                 type = 2;
 376                 gossip_debug(GOSSIP_SUPER_DEBUG,
 377                              "Encoding parent: handle %pU, fsid %u\n",
 378                              &refn.khandle,
 379                              refn.fs_id);
 380         }
 381         *max_len = len;
 382
 383 out:
 384         return type;
 385 }
 386
 387 static const struct export_operations orangefs_export_ops = {
 388         .encode_fh = orangefs_encode_fh,
 389         .fh_to_dentry = orangefs_fh_to_dentry,
 390 };
 391
 392 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
 393 {
 394         struct orangefs_kernel_op_s *op;
 395         int r;
 396         op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
 397         if (!op)
 398                 return -ENOMEM;
 399         op->upcall.req.fs_umount.id = id;
 400         op->upcall.req.fs_umount.fs_id = fs_id;
 401         strncpy(op->upcall.req.fs_umount.orangefs_config_server,
 402             devname, ORANGEFS_MAX_SERVER_ADDR_LEN);
 403         r = service_operation(op, "orangefs_fs_umount", 0);
 404         /* Not much to do about an error here. */
 405         if (r)
 406                 gossip_err("orangefs_unmount: service_operation %d\n", r);
 407         op_release(op);
 408         return r;
 409 }
 410
 411 static int orangefs_fill_sb(struct super_block *sb,
 412                 struct orangefs_fs_mount_response *fs_mount,
 413                 void *data, int silent)
 414 {
 415         int ret = -EINVAL;
 416         struct inode *root = NULL;
 417         struct dentry *root_dentry = NULL;
 418         struct orangefs_object_kref root_object;
 419
 420         /* alloc and init our private orangefs sb info */
 421         sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
 422         if (!ORANGEFS_SB(sb))
 423                 return -ENOMEM;
 424         ORANGEFS_SB(sb)->sb = sb;
 425
 426         ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
 427         ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
 428         ORANGEFS_SB(sb)->id = fs_mount->id;
 429
 430         if (data) {
 431                 ret = parse_mount_options(sb, data, silent);
 432                 if (ret)
 433                         return ret;
 434         }
 435
 436         /* Hang the xattr handlers off the superblock */
 437         sb->s_xattr = orangefs_xattr_handlers;
 438         sb->s_magic = ORANGEFS_SUPER_MAGIC;
 439         sb->s_op = &orangefs_s_ops;
 440         sb->s_d_op = &orangefs_dentry_operations;
 441
 442         sb->s_blocksize = orangefs_bufmap_size_query();
 443         sb->s_blocksize_bits = orangefs_bufmap_shift_query();
 444         sb->s_maxbytes = MAX_LFS_FILESIZE;
 445
 446         root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
 447         root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
 448         gossip_debug(GOSSIP_SUPER_DEBUG,
 449                      "get inode %pU, fsid %d\n",
 450                      &root_object.khandle,
 451                      root_object.fs_id);
 452
 453         root = orangefs_iget(sb, &root_object);
 454         if (IS_ERR(root))
 455                 return PTR_ERR(root);
 456
 457         gossip_debug(GOSSIP_SUPER_DEBUG,
 458                      "Allocated root inode [%p] with mode %x\n",
 459                      root,
 460                      root->i_mode);
 461
 462         /* allocates and places root dentry in dcache */
 463         root_dentry = d_make_root(root);
 464         if (!root_dentry)
 465                 return -ENOMEM;
 466
 467         sb->s_export_op = &orangefs_export_ops;
 468         sb->s_root = root_dentry;
 469         return 0;
 470 }
 471
 472 struct dentry *orangefs_mount(struct file_system_type *fst,
 473                            int flags,
 474                            const char *devname,
 475                            void *data)
 476 {
 477         int ret = -EINVAL;
 478         struct super_block *sb = ERR_PTR(-EINVAL);
 479         struct orangefs_kernel_op_s *new_op;
 480         struct dentry *d = ERR_PTR(-EINVAL);
 481
 482         gossip_debug(GOSSIP_SUPER_DEBUG,
 483                      "orangefs_mount: called with devname %s\n",
 484                      devname);
 485
 486         if (!devname) {
 487                 gossip_err("ERROR: device name not specified.\n");
 488                 return ERR_PTR(-EINVAL);
 489         }
 490
 491         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 492         if (!new_op)
 493                 return ERR_PTR(-ENOMEM);
 494
 495         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
 496                 devname,
 497                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 498
 499         gossip_debug(GOSSIP_SUPER_DEBUG,
 500                      "Attempting ORANGEFS Mount via host %s\n",
 501                      new_op->upcall.req.fs_mount.orangefs_config_server);
 502
 503         ret = service_operation(new_op, "orangefs_mount", 0);
 504         gossip_debug(GOSSIP_SUPER_DEBUG,
 505                      "orangefs_mount: mount got return value of %d\n", ret);
 506         if (ret)
 507                 goto free_op;
 508
 509         if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
 510                 gossip_err("ERROR: Retrieved null fs_id\n");
 511                 ret = -EINVAL;
 512                 goto free_op;
 513         }
 514
 515         sb = sget(fst, NULL, set_anon_super, flags, NULL);
 516
 517         if (IS_ERR(sb)) {
 518                 d = ERR_CAST(sb);
 519                 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
 520                     new_op->downcall.resp.fs_mount.fs_id, devname);
 521                 goto free_op;
 522         }
 523
 524         ret = orangefs_fill_sb(sb,
 525               &new_op->downcall.resp.fs_mount, data,
 526               flags & MS_SILENT ? 1 : 0);
 527
 528         if (ret) {
 529                 d = ERR_PTR(ret);
 530                 goto free_sb_and_op;
 531         }
 532
 533         /*
 534          * on successful mount, store the devname and data
 535          * used
 536          */
 537         strncpy(ORANGEFS_SB(sb)->devname,
 538                 devname,
 539                 ORANGEFS_MAX_SERVER_ADDR_LEN);
 540
 541         /* mount_pending must be cleared */
 542         ORANGEFS_SB(sb)->mount_pending = 0;
 543
 544         /*
 545          * finally, add this sb to our list of known orangefs
 546          * sb's
 547          */
 548         gossip_debug(GOSSIP_SUPER_DEBUG,
 549                      "Adding SB %p to orangefs superblocks\n",
 550                      ORANGEFS_SB(sb));
 551         spin_lock(&orangefs_superblocks_lock);
 552         list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
 553         spin_unlock(&orangefs_superblocks_lock);
 554         op_release(new_op);
 555
 556         /* Must be removed from the list now. */
 557         ORANGEFS_SB(sb)->no_list = 0;
 558
 559         if (orangefs_userspace_version >= 20906) {
 560                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
 561                 if (!new_op)
 562                         return ERR_PTR(-ENOMEM);
 563                 new_op->upcall.req.features.features = 0;
 564                 ret = service_operation(new_op, "orangefs_features", 0);
 565                 orangefs_features = new_op->downcall.resp.features.features;
 566                 op_release(new_op);
 567         } else {
 568                 orangefs_features = 0;
 569         }
 570
 571         return dget(sb->s_root);
 572
 573 free_sb_and_op:
 574         /* Will call orangefs_kill_sb with sb not in list. */
 575         ORANGEFS_SB(sb)->no_list = 1;
 576         /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
 577         deactivate_locked_super(sb);
 578 free_op:
 579         gossip_err("orangefs_mount: mount request failed with %d\n", ret);
 580         if (ret == -EINVAL) {
 581                 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
 582                 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
 583         }
 584
 585         op_release(new_op);
 586
 587         return d;
 588 }
 589
 590 void orangefs_kill_sb(struct super_block *sb)
 591 {
 592         int r;
 593         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
 594
 595         /* provided sb cleanup */
 596         kill_anon_super(sb);
 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("orangefs_inode_cache",
 630                                               sizeof(struct orangefs_inode_s),
 631                                               0,
 632                                               ORANGEFS_CACHE_CREATE_FLAGS,
 633                                               orangefs_inode_cache_ctor);
 634
 635         if (!orangefs_inode_cache) {
 636                 gossip_err("Cannot create orangefs_inode_cache\n");
 637                 return -ENOMEM;
 638         }
 639         return 0;
 640 }
 641
 642 int orangefs_inode_cache_finalize(void)
 643 {
 644         kmem_cache_destroy(orangefs_inode_cache);
 645         return 0;
 646 }