Btrfs: fix infinite loop in btrfs_shrink_device()



If relocate of block group 0 fails with ENOSPC we end up infinitely
looping because key.offset -= 1 statement in that case brings us back to
where we started.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

parent 5eb56d25

fs/btrfs/volumes.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -2987,7 +2987,7 @@ again:
		key.offset = (u64)-1;
		key.type = BTRFS_DEV_EXTENT_KEY;

		while (1) {
		do {
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		if (ret < 0)
		goto done;
		@@ -3029,8 +3029,7 @@ again:
		goto done;
		if (ret == -ENOSPC)
		failed++;
		key.offset -= 1;
		}
		} while (key.offset-- > 0);

		if (failed && !retried) {
		failed = 0;