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btrfs-progs: map-logical: introduce map_one_extent function 

Introduce the function to get accurate extent length based on extent
tree search.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2015-06-17 15:49:01 +08:00 committed by David Sterba
parent 0074cd315c
commit 02454f307b
1 changed files with 58 additions and 0 deletions
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58
btrfs-map-logical.c
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@ -35,6 +35,64 @@
* */
static FILE *info_file;
static int map_one_extent(struct btrfs_fs_info *fs_info,
u64 *logical_ret, u64 *len_ret, int search_foward)
{
struct btrfs_path *path;
struct btrfs_key key;
u64 logical;
u64 len = 0;
int ret = 0;
BUG_ON(!logical_ret);
logical = *logical_ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = logical;
key.type = 0;
key.offset = 0;
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path,
0, 0);
if (ret < 0)
goto out;
BUG_ON(ret == 0);
ret = 0;
again:
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if ((search_foward && key.objectid < logical) ||
(!search_foward && key.objectid > logical) ||
(key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY)) {
if (!search_foward)
ret = btrfs_previous_extent_item(fs_info->extent_root,
path, 0);
else
ret = btrfs_next_item(fs_info->extent_root, path);
if (ret)
goto out;
goto again;
}
logical = key.objectid;
if (key.type == BTRFS_METADATA_ITEM_KEY)
len = fs_info->tree_root->leafsize;
else
len = key.offset;
out:
btrfs_free_path(path);
if (!ret) {
*logical_ret = logical;
if (len_ret)
*len_ret = len;
}
return ret;
}
static struct extent_buffer * debug_read_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize, u64 copy)
{