/* * ext4_sb.h * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/include/linux/minix_fs_sb.h * * Copyright (C) 1991, 1992 Linus Torvalds */ #ifndef _EXT4_SB #define _EXT4_SB #ifdef __KERNEL__ #include <linux/timer.h> #include <linux/wait.h> #include <linux/blockgroup_lock.h> #include <linux/percpu_counter.h> #endif #include <linux/rbtree.h> /* * fourth extended-fs super-block data in memory */ struct ext4_sb_info { unsigned long s_desc_size; /* Size of a group descriptor in bytes */ unsigned long s_inodes_per_block;/* Number of inodes per block */ unsigned long s_blocks_per_group;/* Number of blocks in a group */ unsigned long s_inodes_per_group;/* Number of inodes in a group */ unsigned long s_itb_per_group; /* Number of inode table blocks per group */ unsigned long s_gdb_count; /* Number of group descriptor blocks */ unsigned long s_desc_per_block; /* Number of group descriptors per block */ ext4_group_t s_groups_count; /* Number of groups in the fs */ unsigned long s_overhead_last; /* Last calculated overhead */ unsigned long s_blocks_last; /* Last seen block count */ loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ struct buffer_head * s_sbh; /* Buffer containing the super block */ struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */ struct buffer_head ** s_group_desc; unsigned long s_mount_opt; ext4_fsblk_t s_sb_block; uid_t s_resuid; gid_t s_resgid; unsigned short s_mount_state; unsigned short s_pad; int s_addr_per_block_bits; int s_desc_per_block_bits; int s_inode_size; int s_first_ino; spinlock_t s_next_gen_lock; u32 s_next_generation; u32 s_hash_seed[4]; int s_def_hash_version; struct percpu_counter s_freeblocks_counter; struct percpu_counter s_freeinodes_counter; struct percpu_counter s_dirs_counter; struct blockgroup_lock s_blockgroup_lock; /* root of the per fs reservation window tree */ spinlock_t s_rsv_window_lock; struct rb_root s_rsv_window_root; struct ext4_reserve_window_node s_rsv_window_head; /* Journaling */ struct inode * s_journal_inode; struct journal_s * s_journal; struct list_head s_orphan; unsigned long s_commit_interval; struct block_device *journal_bdev; #ifdef CONFIG_JBD2_DEBUG struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ #endif #ifdef CONFIG_QUOTA char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ int s_jquota_fmt; /* Format of quota to use */ #endif unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ #ifdef EXTENTS_STATS /* ext4 extents stats */ unsigned long s_ext_min; unsigned long s_ext_max; unsigned long s_depth_max; spinlock_t s_ext_stats_lock; unsigned long s_ext_blocks; unsigned long s_ext_extents; #endif /* for buddy allocator */ struct ext4_group_info ***s_group_info; struct inode *s_buddy_cache; long s_blocks_reserved; spinlock_t s_reserve_lock; struct list_head s_active_transaction; struct list_head s_closed_transaction; struct list_head s_committed_transaction; spinlock_t s_md_lock; tid_t s_last_transaction; unsigned short *s_mb_offsets, *s_mb_maxs; /* tunables */ unsigned long s_stripe; unsigned long s_mb_stream_request; unsigned long s_mb_max_to_scan; unsigned long s_mb_min_to_scan; unsigned long s_mb_stats; unsigned long s_mb_order2_reqs; unsigned long s_mb_group_prealloc; /* where last allocation was done - for stream allocation */ unsigned long s_mb_last_group; unsigned long s_mb_last_start; /* history to debug policy */ struct ext4_mb_history *s_mb_history; int s_mb_history_cur; int s_mb_history_max; int s_mb_history_num; struct proc_dir_entry *s_mb_proc; spinlock_t s_mb_history_lock; int s_mb_history_filter; /* stats for buddy allocator */ spinlock_t s_mb_pa_lock; atomic_t s_bal_reqs; /* number of reqs with len > 1 */ atomic_t s_bal_success; /* we found long enough chunks */ atomic_t s_bal_allocated; /* in blocks */ atomic_t s_bal_ex_scanned; /* total extents scanned */ atomic_t s_bal_goals; /* goal hits */ atomic_t s_bal_breaks; /* too long searches */ atomic_t s_bal_2orders; /* 2^order hits */ spinlock_t s_bal_lock; unsigned long s_mb_buddies_generated; unsigned long long s_mb_generation_time; atomic_t s_mb_lost_chunks; atomic_t s_mb_preallocated; atomic_t s_mb_discarded; /* locality groups */ struct ext4_locality_group *s_locality_groups; unsigned int s_log_groups_per_flex; struct flex_groups *s_flex_groups; }; #endif /* _EXT4_SB */