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Subject[PATCH 24/73] union-mount: Add union_find_dir() [ver #2]
Date
From: Valerie Aurora <vaurora@redhat.com>

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

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

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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