X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=fs%2Fbtrfs%2Fextent-tree.c;h=bcd59c7dfb574def82517a80affe6a9ddf756a92;hb=aa3fc52546b847f590d86a093afd863ff9081628;hp=0c097f3aec418564e25df5b7e0af8d9a81a79d1d;hpb=555bdaefd52c386e79f98591810ceb8bab780398;p=karo-tx-linux.git

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0c097f3aec41..bcd59c7dfb57 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3412,7 +3412,7 @@ again:
 	 * our reservation.
 	 */
 	if (unused <= space_info->total_bytes) {
-		unused -= space_info->total_bytes;
+		unused = space_info->total_bytes - unused;
 		if (unused >= num_bytes) {
 			if (!reserved)
 				space_info->bytes_reserved += orig_bytes;