Commit 4c78e9f5 authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: hold a ref on the root in open_ctree 



We lookup the fs_root and put it in our fs_info directly, we should hold
a ref on this root for the lifetime of the fs_info.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 0d4b0463

fs/btrfs/disk-io.c

+8 −0
Original line number Diff line number Diff line
@@ -1537,6 +1537,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) 
	kfree(fs_info->free_space_root);

	kfree(fs_info->super_copy);

	kfree(fs_info->super_for_commit);

	btrfs_put_fs_root(fs_info->fs_root);

	kvfree(fs_info);

}
@@ -3206,6 +3207,13 @@ int __cold open_ctree(struct super_block *sb, 
		goto fail_qgroup;

	}



	if (!btrfs_grab_fs_root(fs_info->fs_root)) {

		fs_info->fs_root = NULL;

		err = -ENOENT;

		btrfs_warn(fs_info, "failed to grab a ref on the fs tree");

		goto fail_qgroup;

	}



	if (sb_rdonly(sb))

		return 0;