simplify get_cramfs_inode()

simply don't hash the inodes that don't have real inumber instead of
skipping them during iget5_locked(); as the result, simple iget_locked()
would do and we can get rid of cramfs ->drop_inode() as well.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/cramfs/inode.c

@@ -39,29 +39,9 @@ static DEFINE_MUTEX(read_mutex);
 #define CRAMINO(x)	(((x)->offset && (x)->size)?(x)->offset<<2:1)
 #define OFFSET(x)	((x)->i_ino)
 
-
-static int cramfs_iget5_test(struct inode *inode, void *opaque)
-{
-	struct cramfs_inode *cramfs_inode = opaque;
-	return inode->i_ino == CRAMINO(cramfs_inode) && inode->i_ino != 1;
-}
-
-static int cramfs_iget5_set(struct inode *inode, void *opaque)
+static void setup_inode(struct inode *inode, struct cramfs_inode * cramfs_inode)
 {
-	struct cramfs_inode *cramfs_inode = opaque;
-	inode->i_ino = CRAMINO(cramfs_inode);
-	return 0;
-}
-
-static struct inode *get_cramfs_inode(struct super_block *sb,
-				struct cramfs_inode * cramfs_inode)
-{
-	struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),
-					    cramfs_iget5_test, cramfs_iget5_set,
-					    cramfs_inode);
 	static struct timespec zerotime;
-
-	if (inode && (inode->i_state & I_NEW)) {
 	inode->i_mode = cramfs_inode->mode;
 	inode->i_uid = cramfs_inode->uid;
 	inode->i_size = cramfs_inode->size;
@@ -86,17 +66,26 @@ static struct inode *get_cramfs_inode(struct super_block *sb,
 		init_special_inode(inode, inode->i_mode,
 			old_decode_dev(cramfs_inode->size));
 	}
-		unlock_new_inode(inode);
-	}
-	return inode;
 }
 
-static void cramfs_drop_inode(struct inode *inode)
+static struct inode *get_cramfs_inode(struct super_block *sb,
+				struct cramfs_inode * cramfs_inode)
 {
-	if (inode->i_ino == 1)
-		generic_delete_inode(inode);
-	else
-		generic_drop_inode(inode);
+	struct inode *inode;
+	if (CRAMINO(cramfs_inode) == 1) {
+		inode = new_inode(sb);
+		if (inode) {
+			inode->i_ino = 1;
+			setup_inode(inode, cramfs_inode);
+		}
+	} else {
+		inode = iget_locked(sb, CRAMINO(cramfs_inode));
+		if (inode) {
+			setup_inode(inode, cramfs_inode);
+			unlock_new_inode(inode);
+		}
+	}
+	return inode;
 }
 
 /*
@@ -542,7 +531,6 @@ static const struct super_operations cramfs_ops = {
 	.put_super	= cramfs_put_super,
 	.remount_fs	= cramfs_remount,
 	.statfs		= cramfs_statfs,
-	.drop_inode	= cramfs_drop_inode,
 };
 
 static int cramfs_get_sb(struct file_system_type *fs_type,