linux/fs/btrfs/orphan.c
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   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
  22int 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
  43int 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 < 0)
  60                goto out;
  61        if (ret) { /* JDM: Really? */
  62                ret = -ENOENT;
  63                goto out;
  64        }
  65
  66        ret = btrfs_del_item(trans, root, path);
  67
  68out:
  69        btrfs_free_path(path);
  70        return ret;
  71}
  72
  73int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
  74{
  75        struct btrfs_path *path;
  76        struct btrfs_key key;
  77        int ret;
  78
  79        key.objectid = BTRFS_ORPHAN_OBJECTID;
  80        key.type = BTRFS_ORPHAN_ITEM_KEY;
  81        key.offset = offset;
  82
  83        path = btrfs_alloc_path();
  84        if (!path)
  85                return -ENOMEM;
  86
  87        ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
  88
  89        btrfs_free_path(path);
  90        return ret;
  91}
  92
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