ovl: factor out ovl_free_entry() and ovl_stack_*() helpers

In preparation for moving lowerstack into ovl_inode.

Note that in ovl_lookup() the temp stack dentry refs are now cloned
into the final ovl_lowerstack instead of being transferred, so cleanup
always needs to call ovl_stack_free(stack).

Reviewed-by: Alexander Larsson <alexl@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 2 insertions, 12 deletions

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index baa970a2b398..35ecea4b60b0 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -54,15 +54,6 @@ module_param_named(xino_auto, ovl_xino_auto_def, bool, 0644);
 MODULE_PARM_DESC(xino_auto,
 		 "Auto enable xino feature");
 
-static void ovl_entry_stack_free(struct ovl_entry *oe)
-{
-	struct ovl_path *lowerstack = ovl_lowerstack(oe);
-	unsigned int i;
-
-	for (i = 0; i < ovl_numlower(oe); i++)
-		dput(lowerstack[i].dentry);
-}
-
 static bool ovl_metacopy_def = IS_ENABLED(CONFIG_OVERLAY_FS_METACOPY);
 module_param_named(metacopy, ovl_metacopy_def, bool, 0644);
 MODULE_PARM_DESC(metacopy,
@@ -73,7 +64,7 @@ static void ovl_dentry_release(struct dentry *dentry)
 	struct ovl_entry *oe = dentry->d_fsdata;
 
 	if (oe) {
-		ovl_entry_stack_free(oe);
+		ovl_stack_put(ovl_lowerstack(oe), ovl_numlower(oe));
 		kfree_rcu(oe, rcu);
 	}
 }
@@ -2070,8 +2061,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 	return 0;
 
 out_free_oe:
-	ovl_entry_stack_free(oe);
-	kfree(oe);
+	ovl_free_entry(oe);
 out_err:
 	kfree(splitlower);
 	path_put(&upperpath);