From: Filipe David Borba Manana <fdmanana@gmail.com>
Date: Wed, 6 Nov 2013 15:12:40 +0000 (+0000)
Subject: Btrfs: don't wait for ordered data outside desired range
X-Git-Tag: MMI-PSA29.97-13-9~13096^2~17
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b52abf1e3b65b4fbd42b39412e040b561faec6a6;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

Btrfs: don't wait for ordered data outside desired range

In btrfs_wait_ordered_range(), if we found an extent to the left
of the start of our desired wait range and the last byte of that
extent is 1 less than the desired range's start, we would would
wait for the IO completion of that extent unnecessarily.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 25a8f3812f14..c37124bccf17 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -803,7 +803,7 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
 			btrfs_put_ordered_extent(ordered);
 			break;
 		}
-		if (ordered->file_offset + ordered->len < start) {
+		if (ordered->file_offset + ordered->len <= start) {
 			btrfs_put_ordered_extent(ordered);
 			break;
 		}