1/* 2 * sb.h - NILFS on-memory super block structure. 3 * 4 * Copyright (C) 2005-2008 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 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 * Written by Ryusuke Konishi <ryusuke@osrg.net> 21 * 22 */ 23 24#ifndef _NILFS_SB 25#define _NILFS_SB 26 27#include <linux/types.h> 28#include <linux/fs.h> 29 30struct the_nilfs; 31struct nilfs_sc_info; 32 33/* 34 * NILFS super-block data in memory 35 */ 36struct nilfs_sb_info { 37 /* Mount options */ 38 unsigned long s_mount_opt; 39 uid_t s_resuid; 40 gid_t s_resgid; 41 42 unsigned long s_interval; /* construction interval */ 43 unsigned long s_watermark; /* threshold of data amount 44 for the segment construction */ 45 46 /* Fundamental members */ 47 struct super_block *s_super; /* reverse pointer to super_block */ 48 struct the_nilfs *s_nilfs; 49 50 /* Segment constructor */ 51 struct list_head s_dirty_files; /* dirty files list */ 52 struct nilfs_sc_info *s_sc_info; /* segment constructor info */ 53 spinlock_t s_inode_lock; /* Lock for the nilfs inode. 54 It covers s_dirty_files list */ 55 56 /* Inode allocator */ 57 spinlock_t s_next_gen_lock; 58 u32 s_next_generation; 59}; 60 61static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb) 62{ 63 return sb->s_fs_info; 64} 65 66static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi) 67{ 68 return sbi->s_sc_info; 69} 70 71/* 72 * Bit operations for the mount option 73 */ 74#define nilfs_clear_opt(sbi, opt) \ 75 do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0) 76#define nilfs_set_opt(sbi, opt) \ 77 do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0) 78#define nilfs_test_opt(sbi, opt) ((sbi)->s_mount_opt & NILFS_MOUNT_##opt) 79#define nilfs_write_opt(sbi, mask, opt) \ 80 do { (sbi)->s_mount_opt = \ 81 (((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) | \ 82 NILFS_MOUNT_##opt); \ 83 } while (0) 84 85#endif /* _NILFS_SB */ 86