linux-kernel - [PATCH 16/34] union-mount: Create IS_MNT

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Date:	Thu, 16 Sep 2010 15:12:07 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Nick Piggin <npiggin@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Jan Blunck <jblunck@...e.de>,
	Valerie Aurora <vaurora@...hat.com>
Subject: [PATCH 16/34] union-mount: Create IS_MNT_UNION()

From: Jan Blunck <jblunck@...e.de>

IS_MNT_UNION() tests whether a vfsmount is a union.  Note that a
directory in a union mounted file system is not necessarily unioned.
Use IS_DIR_UNIONED() to test that.

Signed-off-by: Valerie Aurora <vaurora@...hat.com>
---
 fs/union.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/union.h b/fs/union.h
index 1692803..c496823 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -49,6 +49,7 @@ struct union_stack {
 	struct path u_dirs[0];
 };
 
+#define IS_MNT_UNION(mnt)	((mnt)->mnt_flags & MNT_UNION)
 #define IS_DIR_UNIONED(dentry)	((dentry)->d_union_stack)
 
 extern void d_free_unions(struct dentry *);
@@ -64,6 +65,7 @@ static inline struct path *union_find_dir(struct dentry *dentry,
 
 #else /* CONFIG_UNION_MOUNT */
 
+#define IS_MNT_UNION(x)			(0)
 #define IS_DIR_UNIONED(x)		(0)
 
 #define d_free_unions(x)		do { } while (0)
-- 
1.6.3.3

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