From 6f33434850ed87dc5e56b60ebbad3d3cf405f296 Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Fri, 12 Nov 2010 23:17:56 +0000
Subject: [PATCH] btrfs: Fix early enospc because 'unused' calculated with
wrong sign.
'unused' calculated with wrong sign in reserve_metadata_bytes().
This might have lead to unwanted over-reservations.
Signed-off-by: Arne Jansen <sensille@gmx.net>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
fs/btrfs/extent-tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a541bc87f04c81..ddaf6340fe7f75 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3413,7 +3413,7 @@ 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;
--
GitLab