ovl: do not pass overlay dentry to ovl_get_inode()

This is needed for using ovl_get_inode() for decoding file handles
for NFS export.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/inode.c

@@ -643,14 +643,14 @@ static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
 	return true;
 }
 
-struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
-			    struct dentry *index)
+struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
+			    struct dentry *lowerdentry, struct dentry *index,
+			    unsigned int numlower)
 {
-	struct dentry *lowerdentry = ovl_dentry_lower(dentry);
 	struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
 	struct inode *inode;
 	/* Already indexed or could be indexed on copy up? */
-	bool indexed = (index || (ovl_indexdir(dentry->d_sb) && !upperdentry));
+	bool indexed = (index || (ovl_indexdir(sb) && !upperdentry));
 	struct dentry *origin = indexed ? lowerdentry : NULL;
 	bool is_dir;
 
@@ -675,7 +675,7 @@ struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
 		struct inode *key = d_inode(origin ?: upperdentry);
 		unsigned int nlink = is_dir ? 1 : realinode->i_nlink;
 
-		inode = iget5_locked(dentry->d_sb, (unsigned long) key,
+		inode = iget5_locked(sb, (unsigned long) key,
 				     ovl_inode_test, ovl_inode_set, key);
 		if (!inode)
 			goto out_nomem;
@@ -699,7 +699,7 @@ struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
 			nlink = ovl_get_nlink(lowerdentry, upperdentry, nlink);
 		set_nlink(inode, nlink);
 	} else {
-		inode = new_inode(dentry->d_sb);
+		inode = new_inode(sb);
 		if (!inode)
 			goto out_nomem;
 	}
@@ -711,9 +711,7 @@ struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
 
 	/* Check for non-merge dir that may have whiteouts */
 	if (is_dir) {
-		struct ovl_entry *oe = dentry->d_fsdata;
-
-		if (((upperdentry && lowerdentry) || oe->numlower > 1) ||
+		if (((upperdentry && lowerdentry) || numlower > 1) ||
 		    ovl_check_origin_xattr(upperdentry ?: lowerdentry)) {
 			ovl_set_flag(OVL_WHITEOUTS, inode);
 		}

fs/overlayfs/namei.c

@@ -967,7 +967,8 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
 		upperdentry = dget(index);
 
 	if (upperdentry || ctr) {
-		inode = ovl_get_inode(dentry, upperdentry, index);
+		inode = ovl_get_inode(dentry->d_sb, upperdentry, origin, index,
+				      ctr);
 		err = PTR_ERR(inode);
 		if (IS_ERR(inode))
 			goto out_free_oe;

fs/overlayfs/overlayfs.h

@@ -307,8 +307,9 @@ int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
 bool ovl_is_private_xattr(const char *name);
 
 struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
-struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
-			    struct dentry *index);
+struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
+			    struct dentry *lowerdentry, struct dentry *index,
+			    unsigned int numlower);
 static inline void ovl_copyattr(struct inode *from, struct inode *to)
 {
 	to->i_uid = from->i_uid;