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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4_sb.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
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
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_SB
17#define _EXT4_SB
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
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/*
Shen Feng8a356942008-07-11 19:27:31 -040028 * fourth extended-fs super-block data in memory
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029 */
Mingming Cao617ba132006-10-11 01:20:53 -070030struct ext4_sb_info {
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -070031 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070032 unsigned long s_inodes_per_block;/* Number of inodes per block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070033 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 */
Avantika Mathurfd2d4292008-01-28 23:58:27 -050038 ext4_group_t s_groups_count; /* Number of groups in the fs */
Badari Pulavarty5e700302007-07-15 23:42:00 -070039 unsigned long s_overhead_last; /* Last calculated overhead */
40 unsigned long s_blocks_last; /* Last seen block count */
Eric Sandeene2b46572008-01-28 23:58:27 -050041 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042 struct buffer_head * s_sbh; /* Buffer containing the super block */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040043 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
44 struct buffer_head **s_group_desc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045 unsigned long s_mount_opt;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -070046 ext4_fsblk_t s_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 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;
Theodore Ts'o240799c2008-10-09 23:53:47 -040055 unsigned int s_inode_readahead_blks;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056 spinlock_t s_next_gen_lock;
57 u32 s_next_generation;
58 u32 s_hash_seed[4];
59 int s_def_hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -040060 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070061 struct percpu_counter s_freeblocks_counter;
62 struct percpu_counter s_freeinodes_counter;
63 struct percpu_counter s_dirs_counter;
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -040064 struct percpu_counter s_dirtyblocks_counter;
Pekka Enberg705895b2009-02-15 18:07:52 -050065 struct blockgroup_lock *s_blockgroup_lock;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040066 struct proc_dir_entry *s_proc;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -040067 struct kobject s_kobj;
68 struct completion s_kobj_unregister;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070069
Dave Kleikampac27a0e2006-10-11 01:20:50 -070070 /* Journaling */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040071 struct inode *s_journal_inode;
72 struct journal_s *s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070073 struct list_head s_orphan;
74 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -050075 u32 s_max_batch_time;
76 u32 s_min_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070077 struct block_device *journal_bdev;
Jose R. Santose23291b2007-07-18 08:57:06 -040078#ifdef CONFIG_JBD2_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070079 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
Kalpak Shahef7f3832007-07-18 09:15:20 -040086 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Alex Tomasa86c6182006-10-11 01:21:03 -070087
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
Alex Tomasc9de5602008-01-29 00:19:52 -050097
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;
Alex Tomasc9de5602008-01-29 00:19:52 -0500103 spinlock_t s_md_lock;
104 tid_t s_last_transaction;
Yasunori Gotoff7ef322008-12-17 00:48:39 -0500105 unsigned short *s_mb_offsets;
106 unsigned int *s_mb_maxs;
Alex Tomasc9de5602008-01-29 00:19:52 -0500107
108 /* tunables */
109 unsigned long s_stripe;
Theodore Ts'o5e8814f2008-09-23 18:07:35 -0400110 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;
Alex Tomasc9de5602008-01-29 00:19:52 -0500116 /* 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;
Alex Tomasc9de5602008-01-29 00:19:52 -0500125 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;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400146
Theodore Ts'oafc32f72009-02-28 19:39:58 -0500147 /* for write statistics */
148 unsigned long s_sectors_written_start;
149 u64 s_kbytes_written;
150
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400151 unsigned int s_log_groups_per_flex;
152 struct flex_groups *s_flex_groups;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700153};
154
Pekka Enbergc644f0e2009-01-04 12:00:48 -0800155static inline spinlock_t *
156sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
157{
Pekka Enberg705895b2009-02-15 18:07:52 -0500158 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
Pekka Enbergc644f0e2009-01-04 12:00:48 -0800159}
160
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400161#endif /* _EXT4_SB */