[PATCH 11/34] union-mount: Add union_find_dir()

[Valerie Aurora]

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

Signed-off-by: Valerie Aurora <vaurora@xxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/