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