orphan.c

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/*
 * Copyright (C) 2008 Red Hat.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include "ctree.h"
#include "disk-io.h"

int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root, u64 offset)
{
    struct btrfs_path *path;
    struct btrfs_key key;
    int ret = 0;

    key.objectid = BTRFS_ORPHAN_OBJECTID;
    btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
    key.offset = offset;

    path = btrfs_alloc_path();
    if (!path)
        return -ENOMEM;

    ret = btrfs_insert_empty_item(trans, root, path, &key, 0);

    btrfs_free_path(path);
    return ret;
}

int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
              struct btrfs_root *root, u64 offset)
{
    struct btrfs_path *path;
    struct btrfs_key key;
    int ret = 0;

    key.objectid = BTRFS_ORPHAN_OBJECTID;
    btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
    key.offset = offset;

    path = btrfs_alloc_path();
    if (!path)
        return -ENOMEM;

    ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
    if (ret < 0)
        goto out;
    if (ret) { /* JDM: Really? */
        ret = -ENOENT;
        goto out;
    }

    ret = btrfs_del_item(trans, root, path);

out:
    btrfs_free_path(path);
    return ret;
}

int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
{
    struct btrfs_path *path;
    struct btrfs_key key;
    int ret;

    key.objectid = BTRFS_ORPHAN_OBJECTID;
    key.type = BTRFS_ORPHAN_ITEM_KEY;
    key.offset = offset;

    path = btrfs_alloc_path();
    if (!path)
        return -ENOMEM;

    ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);

    btrfs_free_path(path);
    return ret;
}