From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 22 Apr 2008 13:24:20 +0000 (-0400)
Subject: Btrfs: Set nodatasum on the inode when written by a nodatasum mount
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=409c6118d39cb2d8666bee3d61a1a9ae5bbd4f5d;p=linux-edison.git

Btrfs: Set nodatasum on the inode when written by a nodatasum mount

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3f5525f0834..5d537f26dc8 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -864,6 +864,14 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 	last_index = (pos + count) >> PAGE_CACHE_SHIFT;
 
 	/*
+	 * if this is a nodatasum mount, force summing off for the inode
+	 * all the time.  That way a later mount with summing on won't
+	 * get confused
+	 */
+	if (btrfs_test_opt(root, NODATASUM))
+		btrfs_set_flag(inode, NODATASUM);
+
+	/*
 	 * there are lots of better ways to do this, but this code
 	 * makes sure the first and last page in the file range are
 	 * up to date and ready for cow