release/src-rt-6.x.4708/linux/linux-2.6.36/fs/btrfs/orphan.c

   1 /*
   2  * Copyright (C) 2008 Red Hat.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include "ctree.h"
  20 #include "disk-io.h"
  21
  22 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
  23                              struct btrfs_root *root, u64 offset)
  24 {
  25         struct btrfs_path *path;
  26         struct btrfs_key key;
  27         int ret = 0;
  28
  29         key.objectid = BTRFS_ORPHAN_OBJECTID;
  30         btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
  31         key.offset = offset;
  32
  33         path = btrfs_alloc_path();
  34         if (!path)
  35                 return -ENOMEM;
  36
  37         ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
  38
  39         btrfs_free_path(path);
  40         return ret;
  41 }
  42
  43 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
  44                           struct btrfs_root *root, u64 offset)
  45 {
  46         struct btrfs_path *path;
  47         struct btrfs_key key;
  48         int ret = 0;
  49
  50         key.objectid = BTRFS_ORPHAN_OBJECTID;
  51         btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
  52         key.offset = offset;
  53
  54         path = btrfs_alloc_path();
  55         if (!path)
  56                 return -ENOMEM;
  57
  58         ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
  59         if (ret)
  60                 goto out;
  61
  62         ret = btrfs_del_item(trans, root, path);
  63
  64 out:
  65         btrfs_free_path(path);
  66         return ret;
  67 }
  68
  69 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
  70 {
  71         struct btrfs_path *path;
  72         struct btrfs_key key;
  73         int ret;
  74
  75         key.objectid = BTRFS_ORPHAN_OBJECTID;
  76         key.type = BTRFS_ORPHAN_ITEM_KEY;
  77         key.offset = offset;
  78
  79         path = btrfs_alloc_path();
  80         if (!path)
  81                 return -ENOMEM;
  82
  83         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
  84
  85         btrfs_free_path(path);
  86         return ret;
  87 }