btrfs-progs/root-tree.c

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/*
* Copyright (C) 2007 Oracle. 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 <stdio.h>
#include <stdlib.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
struct btrfs_root_item *item, struct btrfs_key *key)
{
struct btrfs_path path;
struct btrfs_key search_key;
struct btrfs_leaf *l;
int ret;
int slot;
search_key.objectid = objectid;
search_key.flags = (u32)-1;
search_key.offset = (u32)-1;
btrfs_init_path(&path);
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ret = btrfs_search_slot(NULL, root, &search_key, &path, 0, 0);
if (ret < 0)
goto out;
BUG_ON(ret == 0);
l = &path.nodes[0]->leaf;
BUG_ON(path.slots[0] == 0);
slot = path.slots[0] - 1;
if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
ret = 1;
goto out;
}
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memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
sizeof(*item));
btrfs_disk_key_to_cpu(key, &l->items[slot].key);
btrfs_release_path(root, &path);
ret = 0;
out:
return ret;
}
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int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_root_item
*item)
{
struct btrfs_path path;
struct btrfs_leaf *l;
int ret;
int slot;
btrfs_init_path(&path);
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ret = btrfs_search_slot(trans, root, key, &path, 0, 1);
if (ret < 0)
goto out;
BUG_ON(ret != 0);
l = &path.nodes[0]->leaf;
slot = path.slots[0];
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memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
sizeof(*item));
out:
btrfs_release_path(root, &path);
return ret;
}
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int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_root_item
*item)
{
int ret;
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ret = btrfs_insert_item(trans, root, key, item, sizeof(*item));
BUG_ON(ret);
return ret;
}
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int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_key *key)
{
struct btrfs_path path;
int ret;
btrfs_init_path(&path);
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ret = btrfs_search_slot(trans, root, key, &path, -1, 1);
if (ret < 0)
goto out;
BUG_ON(ret != 0);
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ret = btrfs_del_item(trans, root, &path);
out:
btrfs_release_path(root, &path);
return ret;
}