1 /* 2 * direct.h - NILFS direct block pointer. 3 * 4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * Written by Koji Sato. 17 */ 18 19 #ifndef _NILFS_DIRECT_H 20 #define _NILFS_DIRECT_H 21 22 #include <linux/types.h> 23 #include <linux/buffer_head.h> 24 #include "bmap.h" 25 26 27 /** 28 * struct nilfs_direct_node - direct node 29 * @dn_flags: flags 30 * @dn_pad: padding 31 */ 32 struct nilfs_direct_node { 33 __u8 dn_flags; 34 __u8 pad[7]; 35 }; 36 37 #define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1) 38 #define NILFS_DIRECT_KEY_MIN 0 39 #define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1) 40 41 42 int nilfs_direct_init(struct nilfs_bmap *); 43 int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *, 44 __u64 *, int); 45 46 47 #endif /* _NILFS_DIRECT_H */ 48