From: Valerie Aurora <vaurora@xxxxxxxxxx>
union_find_dir() returns the path of the directory at the specified
layer in a unioned directory.
Signed-off-by: Valerie Aurora <valerie.aurora@xxxxxxxxx>
---
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 */
--
1.7.0.4
--
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