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btrfs-progs: btrfstune: use on-stack path buffer in change_extents_uuid 

We don't need to conserve stack space too much unlike kernel, also
remove one error condition.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-11-03 00:37:51 +01:00
parent a75e84a819
commit ac2a089560
1 changed files with 8 additions and 11 deletions
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19
btrfstune.c
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@ -118,19 +118,16 @@ static int change_header_uuid(struct btrfs_root *root, struct extent_buffer *eb)
static int change_extents_uuid(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_path *path;
struct btrfs_path path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
btrfs_init_path(&path);
/*
* Here we don't use transaction as it will takes a lot of reserve
* space, and that will make a near-full btrfs unable to change uuid
*/
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
@ -140,13 +137,13 @@ static int change_extents_uuid(struct btrfs_fs_info *fs_info)
u64 flags;
u64 bytenr;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY)
goto next;
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_extent_item);
flags = btrfs_extent_flags(path->nodes[0], ei);
flags = btrfs_extent_flags(path.nodes[0], ei);
if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
goto next;
@ -165,7 +162,7 @@ static int change_extents_uuid(struct btrfs_fs_info *fs_info)
goto out;
}
next:
ret = btrfs_next_item(root, path);
ret = btrfs_next_item(root, &path);
if (ret < 0)
goto out;
if (ret > 0) {
@ -175,7 +172,7 @@ next:
}
out:
btrfs_free_path(path);
btrfs_release_path(&path);
return ret;
}