On Tue, Mar 12, 2013 at 01:38:17PM -0400, Josef Bacik wrote:
> --- a/cmds-restore.c
> +++ b/cmds-restore.c
> @@ -839,27 +839,67 @@ static int do_list_roots(struct btrfs_root *root)
> static struct btrfs_root *open_fs(const char *dev, u64 root_location,
> int super_mirror, int list_roots)
> {
> + struct btrfs_fs_info *fs_info = NULL;
> struct btrfs_root *root = NULL;
> u64 bytenr;
> int i;
>
> for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
> bytenr = btrfs_sb_offset(i);
> - root = open_ctree_recovery(dev, bytenr, root_location);
> - if (root)
> + fs_info = open_ctree_fs_info(dev, bytenr, root_location, 0, 1);
> + if (fs_info)
> break;
> fprintf(stderr, "Could not open root, trying backup super\n");
> }
>
> - if (root && list_roots) {
> - int ret = do_list_roots(root);
> - if (ret) {
> + if (!fs_info)
> + return NULL;
> +
> + /*
> + * All we really need to succeed is reading the chunk tree, everything
> + * else we can do by hand, since we only need to read the tree root and
> + * the fs_root.
> + */
> + if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
> + u64 generation;
> +
> + root = fs_info->tree_root;
> + if (!root_location)
> + root_location = btrfs_super_root(fs_info->super_copy);
> + generation = btrfs_super_generation(fs_info->super_copy);
> + root->node = read_tree_block(root, root_location,
> + root->leafsize, generation);
> + if (!extent_buffer_uptodate(root->node)) {
> + fprintf(stderr, "Error opening tree root\n");
> close_ctree(root);
> + return NULL;
> + }
> + }
> +
> + if (!list_roots && !fs_info->fs_root) {
> + struct btrfs_key key;
> +
> + key.objectid = BTRFS_FS_TREE_OBJECTID;
> + key.type = BTRFS_ROOT_ITEM_KEY;
> + key.offset = (u64)-1;
> + fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
> + if (IS_ERR(fs_info->fs_root)) {
> + fprintf(stderr, "Couldn't read fs root: %ld\n",
> + PTR_ERR(fs_info->fs_root));
> + close_ctree(fs_info->tree_root);
> + return NULL;
> + }
> + }
> +
> + if (list_roots) {
> + int ret = do_list_roots(fs_info->tree_root);
> + if (ret) {
> + close_ctree(fs_info->tree_root);
> root = NULL;
Setting root to NULL here has no effect, I wonder if this should be
'return NULL' instead, or if it's really ok to return fs_info->fs_root
even after close_ctree() which calls free_fs_roots and other cleanups.
> }
> }
>
> - return root;
> + return fs_info->fs_root;
> }
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