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1/*
2 * linux/include/linux/ext4_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_EXT4_FS_SB
17#define _LINUX_EXT4_FS_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 * third extended-fs super-block data in memory
29 */
30struct 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
148#endif /* _LINUX_EXT4_FS_SB */