From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Mon, 10 Oct 2016 05:47:32 +0000 (+1100)
Subject: xfs: check inode reflink flag before calling reflink functions
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=63646fc58d666f149b85ccf470bfc1576a779d4c;p=linux-beck.git

xfs: check inode reflink flag before calling reflink functions

There are a couple of places where we don't check the inode's
reflink flag before calling into the reflink code.  Fix those,
and add some asserts so we don't make this mistake again.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reported-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
---

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 685c419ae011..9c58b4a83248 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -624,6 +624,7 @@ xfs_reflink_cancel_cow_range(
 	int			error;
 
 	trace_xfs_reflink_cancel_cow_range(ip, offset, count);
+	ASSERT(xfs_is_reflink_inode(ip));
 
 	offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset);
 	if (count == NULLFILEOFF)
@@ -1510,8 +1511,7 @@ xfs_reflink_clear_inode_flag(
 	int			nmaps;
 	int			error = 0;
 
-	if (!(ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK))
-		return 0;
+	ASSERT(xfs_is_reflink_inode(ip));
 
 	fbno = 0;
 	end = XFS_B_TO_FSB(mp, i_size_read(VFS_I(ip)));
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 72bde2811bd7..ade4691e3f74 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -947,11 +947,13 @@ xfs_fs_destroy_inode(
 	XFS_STATS_INC(ip->i_mount, vn_rele);
 	XFS_STATS_INC(ip->i_mount, vn_remove);
 
-	error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF);
-	if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
-		xfs_warn(ip->i_mount, "Error %d while evicting CoW blocks "
-				"for inode %llu.",
-				error, ip->i_ino);
+	if (xfs_is_reflink_inode(ip)) {
+		error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF);
+		if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
+			xfs_warn(ip->i_mount,
+"Error %d while evicting CoW blocks for inode %llu.",
+					error, ip->i_ino);
+	}
 
 	xfs_inactive(ip);