Line data Source code
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 1 : typedef int ext2_grpblk_t;
27 :
28 : /* data type for filesystem-wide blocks number */
29 1 : typedef unsigned long ext2_fsblk_t;
30 1 :
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 1 :
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 1 :
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 2 :
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 :
111 : static inline spinlock_t *
112 : sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
113 : {
114 5088 : return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
115 : }
116 :
117 : #endif /* _LINUX_EXT2_FS_SB */
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