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Ryusuke Konishi65b46432009-04-06 19:01:23 -07001/*
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 */
33struct nilfs_mount_options {
34 unsigned long mount_opt;
35 __u64 snapshot_cno;
36};
37
38struct the_nilfs;
39struct nilfs_sc_info;
40
41/*
42 * NILFS super-block data in memory
43 */
44struct 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
64 /* Segment constructor */
65 struct list_head s_dirty_files; /* dirty files list */
66 struct nilfs_sc_info *s_sc_info; /* segment constructor info */
67 spinlock_t s_inode_lock; /* Lock for the nilfs inode.
68 It covers s_dirty_files list */
69
70 /* Metadata files */
71 struct inode *s_ifile; /* index file inode */
72
73 /* Inode allocator */
74 spinlock_t s_next_gen_lock;
75 u32 s_next_generation;
76};
77
78static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb)
79{
80 return sb->s_fs_info;
81}
82
83static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi)
84{
85 return sbi->s_sc_info;
86}
87
88/*
89 * Bit operations for the mount option
90 */
91#define nilfs_clear_opt(sbi, opt) \
92 do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0)
93#define nilfs_set_opt(sbi, opt) \
94 do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0)
95#define nilfs_test_opt(sbi, opt) ((sbi)->s_mount_opt & NILFS_MOUNT_##opt)
96#define nilfs_write_opt(sbi, mask, opt) \
97 do { (sbi)->s_mount_opt = \
98 (((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) | \
99 NILFS_MOUNT_##opt); \
100 } while (0)
101
102#endif /* _NILFS_SB */