[PATCH v2 2/6] ovl: Break out ovl_e_path_real() from ovl_i_path_real()

[Alexander Larsson <alexl@xxxxxxxxxx>]

This allows us to get the real path from the ovl_entry in ovl_lookup()
before having finished setting up the resulting inode.

Signed-off-by: Alexander Larsson <alexl@xxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
 fs/overlayfs/overlayfs.h |  2 ++
 fs/overlayfs/util.c      | 25 ++++++++++++++++++-------
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index c1233eec2d40..6ce1c7906bb9 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -391,6 +391,8 @@ void ovl_path_upper(struct dentry *dentry, struct path *path);
 void ovl_path_lower(struct dentry *dentry, struct path *path);
 void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
 void ovl_i_path_real(struct inode *inode, struct path *path);
+void ovl_e_path_real(struct ovl_fs *ofs, struct ovl_entry *oe,
+		     struct dentry *upperdentry, struct path *path);
 enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
 enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path);
 struct dentry *ovl_dentry_upper(struct dentry *dentry);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index e526ab059872..c32252153e5e 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -331,19 +331,30 @@ struct dentry *ovl_i_dentry_upper(struct inode *inode)
 	return ovl_upperdentry_dereference(OVL_I(inode));
 }
 
-void ovl_i_path_real(struct inode *inode, struct path *path)
-{
-	struct ovl_path *lowerpath = ovl_lowerpath(OVL_I_E(inode));
+void ovl_e_path_real(struct ovl_fs *ofs,
+		     struct ovl_entry *oe,
+		     struct dentry *upperdentry,
+		     struct path *path)
+{
+	if (upperdentry) {
+		path->dentry = upperdentry;
+		path->mnt = ovl_upper_mnt(ofs);
+	} else {
+		struct ovl_path *lowerpath = ovl_lowerpath(oe);
 
-	path->dentry = ovl_i_dentry_upper(inode);
-	if (!path->dentry) {
 		path->dentry = lowerpath->dentry;
 		path->mnt = lowerpath->layer->mnt;
-	} else {
-		path->mnt = ovl_upper_mnt(OVL_FS(inode->i_sb));
 	}
 }
 
+void ovl_i_path_real(struct inode *inode, struct path *path)
+{
+	ovl_e_path_real(OVL_FS(inode->i_sb),
+			OVL_I_E(inode),
+			ovl_i_dentry_upper(inode),
+			path);
+}
+
 struct inode *ovl_inode_upper(struct inode *inode)
 {
 	struct dentry *upperdentry = ovl_i_dentry_upper(inode);
-- 
2.39.2