linux-kernel - [PATCH 11/34] union-mount: Add union_find

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Date:	Thu, 16 Sep 2010 15:12:02 -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, Valerie Aurora <vaurora@...hat.com>
Subject: [PATCH 11/34] union-mount: Add union_find_dir()

union_find_dir() returns the path of the directory at the specified
layer in a unioned directory.

Signed-off-by: Valerie Aurora <vaurora@...hat.com>
---
 fs/union.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/fs/union.h b/fs/union.h
index 38b26fd..e242451 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -49,6 +49,16 @@ struct union_stack {
 	struct path u_dirs[0];
 };
 
+static inline struct path *union_find_dir(struct dentry *dentry,
+					  unsigned int layer) {
+	BUG_ON(layer >= dentry->d_sb->s_union_count);
+	return &(dentry->d_union_stack->u_dirs[layer]);
+}
+
+#else /* CONFIG_UNION_MOUNT */
+
+#define union_find_dir(x, y)		({ BUG(); (NULL); })
+
 #endif	/* CONFIG_UNION_MOUNT */
 #endif	/* __KERNEL__ */
 #endif	/* __LINUX_UNION_H */
-- 
1.6.3.3

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