git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 65b4643d RK |
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 | ||
| 30 | /* | |
| 31 | * Mount options | |
| 32 | */ | |
| 33 | struct nilfs_mount_options { | |
| 34 | unsigned long mount_opt; | |
| 35 | __u64 snapshot_cno; | |
| 36 | }; | |
| 37 | ||
| 38 | struct the_nilfs; | |
| 39 | struct nilfs_sc_info; | |
| 40 | ||
| 41 | /* | |
| 42 | * NILFS super-block data in memory | |
| 43 | */ | |
| 44 | struct nilfs_sb_info { | |
| 45 | /* Snapshot status */ | |
| 46 | __u64 s_snapshot_cno; /* Checkpoint number */ | |
| 47 | atomic_t s_inodes_count; | |
| 48 | atomic_t s_blocks_count; /* Reserved (might be deleted) */ | |
| 49 | ||
| 50 | /* Mount options */ | |
| 51 | unsigned long s_mount_opt; | |
| 52 | uid_t s_resuid; | |
| 53 | gid_t s_resgid; | |
| 54 | ||
| 55 | unsigned long s_interval; /* construction interval */ | |
| 56 | unsigned long s_watermark; /* threshold of data amount | |
| 57 | for the segment construction */ | |
| 58 | ||
| 59 | /* Fundamental members */ | |
| 60 | struct super_block *s_super; /* reverse pointer to super_block */ | |
| 61 | struct the_nilfs *s_nilfs; | |
| 62 | struct list_head s_list; /* list head for nilfs->ns_supers */ | |
| 6dd47406 | 63 | atomic_t s_count; /* reference count */ |
| 65b4643d RK |
64 | |
| 65 | /* Segment constructor */ | |
| 66 | struct list_head s_dirty_files; /* dirty files list */ | |
| 67 | struct nilfs_sc_info *s_sc_info; /* segment constructor info */ | |
| 68 | spinlock_t s_inode_lock; /* Lock for the nilfs inode. | |
| 69 | It covers s_dirty_files list */ | |
| 70 | ||
| 71 | /* Metadata files */ | |
| 72 | struct inode *s_ifile; /* index file inode */ | |
| 73 | ||
| 74 | /* Inode allocator */ | |
| 75 | spinlock_t s_next_gen_lock; | |
| 76 | u32 s_next_generation; | |
| 77 | }; | |
| 78 | ||
| 79 | static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb) | |
| 80 | { | |
| 81 | return sb->s_fs_info; | |
| 82 | } | |
| 83 | ||
| 84 | static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi) | |
| 85 | { | |
| 86 | return sbi->s_sc_info; | |
| 87 | } | |
| 88 | ||
| 89 | /* | |
| 90 | * Bit operations for the mount option | |
| 91 | */ | |
| 92 | #define nilfs_clear_opt(sbi, opt) \ | |
| 93 | do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0) | |
| 94 | #define nilfs_set_opt(sbi, opt) \ | |
| 95 | do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0) | |
| 96 | #define nilfs_test_opt(sbi, opt) ((sbi)->s_mount_opt & NILFS_MOUNT_##opt) | |
| 97 | #define nilfs_write_opt(sbi, mask, opt) \ | |
| 98 | do { (sbi)->s_mount_opt = \ | |
| 99 | (((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) | \ | |
| 100 | NILFS_MOUNT_##opt); \ | |
| 101 | } while (0) | |
| 102 | ||
| 103 | #endif /* _NILFS_SB */ |