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1 | /* |
2 | * linux/include/linux/ext2_fs_sb.h |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 |
5 | * Remy Card (card@masi.ibp.fr) |
6 | * Laboratoire MASI - Institut Blaise Pascal |
7 | * Universite Pierre et Marie Curie (Paris VI) |
8 | * |
9 | * from |
10 | * |
11 | * linux/include/linux/minix_fs_sb.h |
12 | * |
13 | * Copyright (C) 1991, 1992 Linus Torvalds |
14 | */ |
15 | |
16 | #ifndef _LINUX_EXT2_FS_SB |
17 | #define _LINUX_EXT2_FS_SB |
18 | |
19 | #include <linux/blockgroup_lock.h> |
20 | #include <linux/percpu_counter.h> |
21 | #include <linux/rbtree.h> |
22 | |
23 | /* XXX Here for now... not interested in restructing headers JUST now */ |
24 | |
25 | /* data type for block offset of block group */ |
26 | typedef int ext2_grpblk_t; |
27 | |
28 | /* data type for filesystem-wide blocks number */ |
29 | typedef unsigned long ext2_fsblk_t; |
30 | |
31 | #define E2FSBLK "%lu" |
32 | |
33 | struct ext2_reserve_window { |
34 | ext2_fsblk_t _rsv_start; /* First byte reserved */ |
35 | ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ |
36 | }; |
37 | |
38 | struct ext2_reserve_window_node { |
39 | struct rb_node rsv_node; |
40 | __u32 rsv_goal_size; |
41 | __u32 rsv_alloc_hit; |
42 | struct ext2_reserve_window rsv_window; |
43 | }; |
44 | |
45 | struct ext2_block_alloc_info { |
46 | /* information about reservation window */ |
47 | struct ext2_reserve_window_node rsv_window_node; |
48 | /* |
49 | * was i_next_alloc_block in ext2_inode_info |
50 | * is the logical (file-relative) number of the |
51 | * most-recently-allocated block in this file. |
52 | * We use this for detecting linearly ascending allocation requests. |
53 | */ |
54 | __u32 last_alloc_logical_block; |
55 | /* |
56 | * Was i_next_alloc_goal in ext2_inode_info |
57 | * is the *physical* companion to i_next_alloc_block. |
58 | * it the the physical block number of the block which was most-recentl |
59 | * allocated to this file. This give us the goal (target) for the next |
60 | * allocation when we detect linearly ascending requests. |
61 | */ |
62 | ext2_fsblk_t last_alloc_physical_block; |
63 | }; |
64 | |
65 | #define rsv_start rsv_window._rsv_start |
66 | #define rsv_end rsv_window._rsv_end |
67 | |
68 | /* |
69 | * second extended-fs super-block data in memory |
70 | */ |
71 | struct ext2_sb_info { |
72 | unsigned long s_frag_size; /* Size of a fragment in bytes */ |
73 | unsigned long s_frags_per_block;/* Number of fragments per block */ |
74 | unsigned long s_inodes_per_block;/* Number of inodes per block */ |
75 | unsigned long s_frags_per_group;/* Number of fragments in a group */ |
76 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ |
77 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
78 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ |
79 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ |
80 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ |
81 | unsigned long s_groups_count; /* Number of groups in the fs */ |
82 | unsigned long s_overhead_last; /* Last calculated overhead */ |
83 | unsigned long s_blocks_last; /* Last seen block count */ |
84 | struct buffer_head * s_sbh; /* Buffer containing the super block */ |
85 | struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ |
86 | struct buffer_head ** s_group_desc; |
87 | unsigned long s_mount_opt; |
88 | unsigned long s_sb_block; |
89 | uid_t s_resuid; |
90 | gid_t s_resgid; |
91 | unsigned short s_mount_state; |
92 | unsigned short s_pad; |
93 | int s_addr_per_block_bits; |
94 | int s_desc_per_block_bits; |
95 | int s_inode_size; |
96 | int s_first_ino; |
97 | spinlock_t s_next_gen_lock; |
98 | u32 s_next_generation; |
99 | unsigned long s_dir_count; |
100 | u8 *s_debts; |
101 | struct percpu_counter s_freeblocks_counter; |
102 | struct percpu_counter s_freeinodes_counter; |
103 | struct percpu_counter s_dirs_counter; |
104 | struct blockgroup_lock *s_blockgroup_lock; |
105 | /* root of the per fs reservation window tree */ |
106 | spinlock_t s_rsv_window_lock; |
107 | struct rb_root s_rsv_window_root; |
108 | struct ext2_reserve_window_node s_rsv_window_head; |
109 | /* |
110 | * s_lock protects against concurrent modifications of s_mount_state, |
111 | * s_blocks_last, s_overhead_last and the content of superblock's |
112 | * buffer pointed to by sbi->s_es. |
113 | * |
114 | * Note: It is used in ext2_show_options() to provide a consistent view |
115 | * of the mount options. |
116 | */ |
117 | spinlock_t s_lock; |
118 | }; |
119 | |
120 | static inline spinlock_t * |
121 | sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) |
122 | { |
123 | return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); |
124 | } |
125 | |
126 | #endif /* _LINUX_EXT2_FS_SB */ |
127 |
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