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[linux-2.6] / fs / ext4 / ext4_sb.h
1 /*
2  *  ext4_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 _EXT4_SB
17 #define _EXT4_SB
18
19 #ifdef __KERNEL__
20 #include <linux/timer.h>
21 #include <linux/wait.h>
22 #include <linux/blockgroup_lock.h>
23 #include <linux/percpu_counter.h>
24 #endif
25 #include <linux/rbtree.h>
26
27 /*
28  * fourth extended-fs super-block data in memory
29  */
30 struct ext4_sb_info {
31         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
32         unsigned long s_inodes_per_block;/* Number of inodes per block */
33         unsigned long s_blocks_per_group;/* Number of blocks in a group */
34         unsigned long s_inodes_per_group;/* Number of inodes in a group */
35         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
36         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
37         unsigned long s_desc_per_block; /* Number of group descriptors per block */
38         ext4_group_t s_groups_count;    /* Number of groups in the fs */
39         unsigned long s_overhead_last;  /* Last calculated overhead */
40         unsigned long s_blocks_last;    /* Last seen block count */
41         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
42         struct buffer_head * s_sbh;     /* Buffer containing the super block */
43         struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
44         struct buffer_head ** s_group_desc;
45         unsigned long  s_mount_opt;
46         ext4_fsblk_t s_sb_block;
47         uid_t s_resuid;
48         gid_t s_resgid;
49         unsigned short s_mount_state;
50         unsigned short s_pad;
51         int s_addr_per_block_bits;
52         int s_desc_per_block_bits;
53         int s_inode_size;
54         int s_first_ino;
55         spinlock_t s_next_gen_lock;
56         u32 s_next_generation;
57         u32 s_hash_seed[4];
58         int s_def_hash_version;
59         struct percpu_counter s_freeblocks_counter;
60         struct percpu_counter s_freeinodes_counter;
61         struct percpu_counter s_dirs_counter;
62         struct blockgroup_lock s_blockgroup_lock;
63
64         /* root of the per fs reservation window tree */
65         spinlock_t s_rsv_window_lock;
66         struct rb_root s_rsv_window_root;
67         struct ext4_reserve_window_node s_rsv_window_head;
68
69         /* Journaling */
70         struct inode * s_journal_inode;
71         struct journal_s * s_journal;
72         struct list_head s_orphan;
73         unsigned long s_commit_interval;
74         struct block_device *journal_bdev;
75 #ifdef CONFIG_JBD2_DEBUG
76         struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */
77         wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */
78 #endif
79 #ifdef CONFIG_QUOTA
80         char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
81         int s_jquota_fmt;                       /* Format of quota to use */
82 #endif
83         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
84
85 #ifdef EXTENTS_STATS
86         /* ext4 extents stats */
87         unsigned long s_ext_min;
88         unsigned long s_ext_max;
89         unsigned long s_depth_max;
90         spinlock_t s_ext_stats_lock;
91         unsigned long s_ext_blocks;
92         unsigned long s_ext_extents;
93 #endif
94
95         /* for buddy allocator */
96         struct ext4_group_info ***s_group_info;
97         struct inode *s_buddy_cache;
98         long s_blocks_reserved;
99         spinlock_t s_reserve_lock;
100         struct list_head s_active_transaction;
101         struct list_head s_closed_transaction;
102         struct list_head s_committed_transaction;
103         spinlock_t s_md_lock;
104         tid_t s_last_transaction;
105         unsigned short *s_mb_offsets, *s_mb_maxs;
106
107         /* tunables */
108         unsigned long s_stripe;
109         unsigned long s_mb_stream_request;
110         unsigned long s_mb_max_to_scan;
111         unsigned long s_mb_min_to_scan;
112         unsigned long s_mb_stats;
113         unsigned long s_mb_order2_reqs;
114         unsigned long s_mb_group_prealloc;
115         /* where last allocation was done - for stream allocation */
116         unsigned long s_mb_last_group;
117         unsigned long s_mb_last_start;
118
119         /* history to debug policy */
120         struct ext4_mb_history *s_mb_history;
121         int s_mb_history_cur;
122         int s_mb_history_max;
123         int s_mb_history_num;
124         struct proc_dir_entry *s_mb_proc;
125         spinlock_t s_mb_history_lock;
126         int s_mb_history_filter;
127
128         /* stats for buddy allocator */
129         spinlock_t s_mb_pa_lock;
130         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
131         atomic_t s_bal_success; /* we found long enough chunks */
132         atomic_t s_bal_allocated;       /* in blocks */
133         atomic_t s_bal_ex_scanned;      /* total extents scanned */
134         atomic_t s_bal_goals;   /* goal hits */
135         atomic_t s_bal_breaks;  /* too long searches */
136         atomic_t s_bal_2orders; /* 2^order hits */
137         spinlock_t s_bal_lock;
138         unsigned long s_mb_buddies_generated;
139         unsigned long long s_mb_generation_time;
140         atomic_t s_mb_lost_chunks;
141         atomic_t s_mb_preallocated;
142         atomic_t s_mb_discarded;
143
144         /* locality groups */
145         struct ext4_locality_group *s_locality_groups;
146
147         unsigned int s_log_groups_per_flex;
148         struct flex_groups *s_flex_groups;
149 };
150
151 #endif  /* _EXT4_SB */