linux-ext4 - [PATCH] msync: fix incorrect fstart calculation

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Message-id: <006a01cf91fc$5d225170$1766f450$@samsung.com>
Date:	Fri, 27 Jun 2014 20:38:49 +0900
From:	Namjae Jeon <namjae.jeon@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-ext4 <linux-ext4@...r.kernel.org>,
	Lukáš Czerner <lczerner@...hat.com>,
	'Matthew Wilcox' <matthew.r.wilcox@...el.com>,
	'Eric Whitney' <enwlinux@...il.com>,
	Ashish Sangwan <a.sangwan@...sung.com>
Subject: [PATCH] msync: fix incorrect fstart calculation

Fix a regression caused by Commit 7fc34a62ca mm/msync.c: sync only
the requested range in msync().
xfstests generic/075 fail occured on ext4 data=journal mode because
the intended range was not syncing due to wrong fstart calculation.

Cc: Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc: Lukáš Czerner <lczerner@...hat.com>
Reported-by: Eric Whitney <enwlinux@...il.com>
Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@...sung.com>
---
 mm/msync.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/msync.c b/mm/msync.c
index a5c6736..ad97dce 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -78,7 +78,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
 			goto out_unlock;
 		}
 		file = vma->vm_file;
-		fstart = start + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
+		fstart = (start - vma->vm_start) +
+			 ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
 		fend = fstart + (min(end, vma->vm_end) - start) - 1;
 		start = vma->vm_end;
 		if ((flags & MS_SYNC) && file &&
-- 
1.7.11-rc0

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