[PATCH 24/73] union-mount: Add union_find_dir() [ver #2]

[David Howells]

From: Valerie Aurora <vaurora@xxxxxxxxxx>

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

Original-author: Valerie Aurora <vaurora@xxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 fs/union.h |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/fs/union.h b/fs/union.h
index d42dc09..f90d037 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -19,6 +19,7 @@
 #include <linux/mount.h>
 #include <linux/dcache.h>
 #include <linux/path.h>
+#include <linux/bug.h>
 
 /*
  * WARNING! Confusing terminology alert.
@@ -50,4 +51,20 @@ 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 */
+
+static inline
+struct path *union_find_dir(struct dentry *dentry, unsigned int layer)
+{
+	BUG();
+	return NULL;
+}
+
 #endif	/* CONFIG_UNION_MOUNT */

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