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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> | |
a686cd89 MB |
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 | |
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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 */ | |
2235219b BP |
82 | unsigned long s_overhead_last; /* Last calculated overhead */ |
83 | unsigned long s_blocks_last; /* Last seen block count */ | |
1da177e4 LT |
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; | |
93d44cb2 | 88 | unsigned long s_sb_block; |
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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; | |
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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; | |
1da177e4 LT |
109 | }; |
110 | ||
111 | #endif /* _LINUX_EXT2_FS_SB */ |