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

Signed-off-by: Wang Shilong <wangsl.f...@cn.fujitsu.com>
---
 fs/btrfs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e2c3d63..ed8b55c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7567,7 +7567,8 @@ 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) {
                /*
-- 
1.8.2.1

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