/* * sb.h - NILFS on-memory super block structure. * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Ryusuke Konishi <ryusuke@osrg.net> * */ #ifndef _NILFS_SB #define _NILFS_SB #include <linux/types.h> #include <linux/fs.h> /* * Mount options */ struct nilfs_mount_options { unsigned long mount_opt; __u64 snapshot_cno; }; struct the_nilfs; struct nilfs_sc_info; /* * NILFS super-block data in memory */ struct nilfs_sb_info { /* Snapshot status */ __u64 s_snapshot_cno; /* Checkpoint number */ atomic_t s_inodes_count; atomic_t s_blocks_count; /* Reserved (might be deleted) */ /* Mount options */ unsigned long s_mount_opt; uid_t s_resuid; gid_t s_resgid; unsigned long s_interval; /* construction interval */ unsigned long s_watermark; /* threshold of data amount for the segment construction */ /* Fundamental members */ struct super_block *s_super; /* reverse pointer to super_block */ struct the_nilfs *s_nilfs; struct list_head s_list; /* list head for nilfs->ns_supers */ /* Segment constructor */ struct list_head s_dirty_files; /* dirty files list */ struct nilfs_sc_info *s_sc_info; /* segment constructor info */ spinlock_t s_inode_lock; /* Lock for the nilfs inode. It covers s_dirty_files list */ /* Metadata files */ struct inode *s_ifile; /* index file inode */ /* Inode allocator */ spinlock_t s_next_gen_lock; u32 s_next_generation; }; static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb) { return sb->s_fs_info; } static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi) { return sbi->s_sc_info; } /* * Bit operations for the mount option */ #define nilfs_clear_opt(sbi, opt) \ do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0) #define nilfs_set_opt(sbi, opt) \ do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0) #define nilfs_test_opt(sbi, opt) ((sbi)->s_mount_opt & NILFS_MOUNT_##opt) #define nilfs_write_opt(sbi, mask, opt) \ do { (sbi)->s_mount_opt = \ (((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) | \ NILFS_MOUNT_##opt); \ } while (0) #endif /* _NILFS_SB */