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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 */ |
63 | atomic_t s_count; /* reference count */ |
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 */ |
104 |
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