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-rw-r--r--fs/ext4/ext4_sb.h161
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diff --git a/fs/ext4/ext4_sb.h b/fs/ext4/ext4_sb.h
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--- a/fs/ext4/ext4_sb.h
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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 */
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 unsigned int s_inode_readahead_blks;
56 spinlock_t s_next_gen_lock;
57 u32 s_next_generation;
58 u32 s_hash_seed[4];
59 int s_def_hash_version;
60 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
61 struct percpu_counter s_freeblocks_counter;
62 struct percpu_counter s_freeinodes_counter;
63 struct percpu_counter s_dirs_counter;
64 struct percpu_counter s_dirtyblocks_counter;
65 struct blockgroup_lock *s_blockgroup_lock;
66 struct proc_dir_entry *s_proc;
67 struct kobject s_kobj;
68 struct completion s_kobj_unregister;
69
70 /* Journaling */
71 struct inode *s_journal_inode;
72 struct journal_s *s_journal;
73 struct list_head s_orphan;
74 unsigned long s_commit_interval;
75 u32 s_max_batch_time;
76 u32 s_min_batch_time;
77 struct block_device *journal_bdev;
78#ifdef CONFIG_JBD2_DEBUG
79 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
80 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
81#endif
82#ifdef CONFIG_QUOTA
83 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
84 int s_jquota_fmt; /* Format of quota to use */
85#endif
86 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
87
88#ifdef EXTENTS_STATS
89 /* ext4 extents stats */
90 unsigned long s_ext_min;
91 unsigned long s_ext_max;
92 unsigned long s_depth_max;
93 spinlock_t s_ext_stats_lock;
94 unsigned long s_ext_blocks;
95 unsigned long s_ext_extents;
96#endif
97
98 /* for buddy allocator */
99 struct ext4_group_info ***s_group_info;
100 struct inode *s_buddy_cache;
101 long s_blocks_reserved;
102 spinlock_t s_reserve_lock;
103 spinlock_t s_md_lock;
104 tid_t s_last_transaction;
105 unsigned short *s_mb_offsets;
106 unsigned int *s_mb_maxs;
107
108 /* tunables */
109 unsigned long s_stripe;
110 unsigned int s_mb_stream_request;
111 unsigned int s_mb_max_to_scan;
112 unsigned int s_mb_min_to_scan;
113 unsigned int s_mb_stats;
114 unsigned int s_mb_order2_reqs;
115 unsigned int s_mb_group_prealloc;
116 /* where last allocation was done - for stream allocation */
117 unsigned long s_mb_last_group;
118 unsigned long s_mb_last_start;
119
120 /* history to debug policy */
121 struct ext4_mb_history *s_mb_history;
122 int s_mb_history_cur;
123 int s_mb_history_max;
124 int s_mb_history_num;
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 /* for write statistics */
148 unsigned long s_sectors_written_start;
149 u64 s_kbytes_written;
150
151 unsigned int s_log_groups_per_flex;
152 struct flex_groups *s_flex_groups;
153};
154
155static inline spinlock_t *
156sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
157{
158 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
159}
160
161#endif /* _EXT4_SB */
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-02 13:38:20 -0500