From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Thu, 17 Jul 2014 03:44:13 +0000 (+0800)
Subject: Btrfs: fix wrong write range for filemap_fdatawrite_range()
X-Git-Tag: firefly_0821_release~176^2~3206^2~25
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9a025a0860ccc0f02af153c966bc1f83e5d9fc62;p=firefly-linux-kernel-4.4.55.git

Btrfs: fix wrong write range for filemap_fdatawrite_range()

filemap_fdatawrite_range() expect the third arg to be @end
not @len, fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 33c05188cbf0..73fadc7ead0e 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7533,7 +7533,8 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
 	count = iov_iter_count(iter);
 	if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
 		     &BTRFS_I(inode)->runtime_flags))
-		filemap_fdatawrite_range(inode->i_mapping, offset, count);
+		filemap_fdatawrite_range(inode->i_mapping, offset,
+					 offset + count - 1);
 
 	if (rw & WRITE) {
 		/*