[PATCH 02/10] fs: add path_create(), path_move() and path_clone()

[Mateusz Guzik]

Signed-off-by: Mateusz Guzik <mjguzik@xxxxxxxxx>
---
 fs/namei.c           | 29 +++++++++++++++++++++++++++++
 include/linux/path.h | 14 ++++++++++++--
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index ca4f5e3be99a..c8754c7ba8be 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -698,6 +698,35 @@ static __always_inline int lookup_inode_permission_may_exec(struct mnt_idmap *id
 	return security_inode_permission(inode, mask);
 }
 
+/**
+ * path_create - WRITEME
+ * @path: path to get the reference to
+ * @mnt: WRITEME
+ * @dentry: WRITEME
+ *
+ * Create a path object using the given vfsmount and dentry pair while incrementing
+ * the reference count on both.
+ */
+void path_create(struct path *path, struct vfsmount *mnt, struct dentry *dentry)
+{
+	path->mnt = mntget(mnt);
+	path->dentry = dget(dentry);
+}
+EXPORT_SYMBOL(path_create);
+
+/**
+ * path_clone - WRITEME
+ * @path: path to get the reference to
+ *
+ * Given a path increment the reference count to the dentry and the vfsmount.
+ */
+void path_clone(const struct path *src, struct path *dst)
+{
+	dst->mnt = mntget(src->mnt);
+	dst->dentry = dget(src->dentry);
+}
+EXPORT_SYMBOL(path_clone);
+
 /**
  * path_get - get a reference to a path
  * @path: path to get the reference to
diff --git a/include/linux/path.h b/include/linux/path.h
index 7ea389dc764b..8a621e0e1921 100644
--- a/include/linux/path.h
+++ b/include/linux/path.h
@@ -10,8 +10,18 @@ struct path {
 	struct dentry *dentry;
 } __randomize_layout;
 
-extern void path_get(const struct path *);
-extern void path_put(const struct path *);
+void path_create(struct path *, struct vfsmount *, struct dentry *);
+void path_clone(const struct path *, struct path *);
+void path_get(const struct path *);
+void path_put(const struct path *);
+
+static inline void path_move(struct path *src, struct path *dst)
+{
+	dst->mnt = src->mnt;
+	dst->dentry = src->dentry;
+	src->mnt = NULL;
+	src->dentry = NULL;
+}
 
 static inline int path_equal(const struct path *path1, const struct path *path2)
 {
-- 
2.53.0