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