89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
#include <linux/module.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);
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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];
|
|
memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
|
|
sizeof(*item));
|
|
out:
|
|
btrfs_release_path(root, &path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_key *key, struct btrfs_root_item
|
|
*item)
|
|
{
|
|
int ret;
|
|
ret = btrfs_insert_item(trans, root, key, item, sizeof(*item));
|
|
BUG_ON(ret);
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
ret = btrfs_search_slot(trans, root, key, &path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
BUG_ON(ret != 0);
|
|
ret = btrfs_del_item(trans, root, &path);
|
|
out:
|
|
btrfs_release_path(root, &path);
|
|
return ret;
|
|
}
|