From 00d01bc17cc2807292303961519d9c005794eb1d Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Wed, 25 May 2011 12:22:50 +0000
Subject: btrfs scrub: don't coalesce pages that are logically discontiguous

scrub_page collects several pages into one bio as long as they are physically
contiguous. As we only save one logical address for the whole bio, don't
collect pages that are physically contiguous but logically discontiguous.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 87a2f12..6dfed0c 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -631,7 +631,8 @@ again:
 	if (sbio->count == 0) {
 		sbio->physical = physical;
 		sbio->logical = logical;
-	} else if (sbio->physical + sbio->count * PAGE_SIZE != physical) {
+	} else if (sbio->physical + sbio->count * PAGE_SIZE != physical ||
+		   sbio->logical + sbio->count * PAGE_SIZE != logical) {
 		scrub_submit(sdev);
 		goto again;
 	}
-- 
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