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 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 68 /* root of the per fs reservation window tree */ 69 spinlock_t s_rsv_window_lock; 70 struct rb_root s_rsv_window_root; 71 72 /* Journaling */ 73 struct inode *s_journal_inode; 74 struct journal_s *s_journal; 75 struct list_head s_orphan; 76 unsigned long s_commit_interval; 77 u32 s_max_batch_time; 78 u32 s_min_batch_time; 79 struct block_device *journal_bdev; 80 #ifdef CONFIG_JBD2_DEBUG 81 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 82 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 83 #endif 84 #ifdef CONFIG_QUOTA 85 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 86 int s_jquota_fmt; /* Format of quota to use */ 87 #endif 88 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 89 90 #ifdef EXTENTS_STATS 91 /* ext4 extents stats */ 92 unsigned long s_ext_min; 93 unsigned long s_ext_max; 94 unsigned long s_depth_max; 95 spinlock_t s_ext_stats_lock; 96 unsigned long s_ext_blocks; 97 unsigned long s_ext_extents; 98 #endif 99 100 /* for buddy allocator */ 101 struct ext4_group_info ***s_group_info; 102 struct inode *s_buddy_cache; 103 long s_blocks_reserved; 104 spinlock_t s_reserve_lock; 105 spinlock_t s_md_lock; 106 tid_t s_last_transaction; 107 unsigned short *s_mb_offsets; 108 unsigned int *s_mb_maxs; 109 110 /* tunables */ 111 unsigned long s_stripe; 112 unsigned int s_mb_stream_request; 113 unsigned int s_mb_max_to_scan; 114 unsigned int s_mb_min_to_scan; 115 unsigned int s_mb_stats; 116 unsigned int s_mb_order2_reqs; 117 unsigned int s_mb_group_prealloc; 118 /* where last allocation was done - for stream allocation */ 119 unsigned long s_mb_last_group; 120 unsigned long s_mb_last_start; 121 122 /* history to debug policy */ 123 struct ext4_mb_history *s_mb_history; 124 int s_mb_history_cur; 125 int s_mb_history_max; 126 int s_mb_history_num; 127 spinlock_t s_mb_history_lock; 128 int s_mb_history_filter; 129 130 /* stats for buddy allocator */ 131 spinlock_t s_mb_pa_lock; 132 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 133 atomic_t s_bal_success; /* we found long enough chunks */ 134 atomic_t s_bal_allocated; /* in blocks */ 135 atomic_t s_bal_ex_scanned; /* total extents scanned */ 136 atomic_t s_bal_goals; /* goal hits */ 137 atomic_t s_bal_breaks; /* too long searches */ 138 atomic_t s_bal_2orders; /* 2^order hits */ 139 spinlock_t s_bal_lock; 140 unsigned long s_mb_buddies_generated; 141 unsigned long long s_mb_generation_time; 142 atomic_t s_mb_lost_chunks; 143 atomic_t s_mb_preallocated; 144 atomic_t s_mb_discarded; 145 146 /* locality groups */ 147 struct ext4_locality_group *s_locality_groups; 148 149 unsigned int s_log_groups_per_flex; 150 struct flex_groups *s_flex_groups; 151 }; 152 153 static inline spinlock_t * sb_bgl_lock(struct ext4_sb_info * sbi,unsigned int block_group)154sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group) 155 { 156 return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group); 157 } 158 159 #endif /* _EXT4_SB */ 160