mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-30 05:48:51 +09:00
![Qu Wenruo](/assets/img/avatar_default.png)
open_ctree_fs_info() is the main entry point to open btrfs. This version is a simplfied version of __open_ctree_fd() of btrfs-progs, the main differences are: - Parameters on how to specify a block device Instead of @fd and @path, U-Boot uses blk_desc and disk_partition_t. - Remove open_ctree flags There won't be multiple open ctree modes in U-Boot. Otherwise functions structures are all kept the same. With open_ctree_fs_info() implemented, also introduce the global current_fs_info pointer to show the current opened btrfs. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz>
48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
#include "ctree.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_key found_key;
|
|
struct extent_buffer *l;
|
|
int ret;
|
|
int slot;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
search_key.objectid = objectid;
|
|
search_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
search_key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (path->slots[0] == 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(ret == 0);
|
|
l = path->nodes[0];
|
|
slot = path->slots[0] - 1;
|
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
|
if (found_key.type != BTRFS_ROOT_ITEM_KEY ||
|
|
found_key.objectid != objectid) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
|
|
sizeof(*item));
|
|
memcpy(key, &found_key, sizeof(found_key));
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|