| /* |
| * 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; |
| unsigned int s_inode_readahead_blks; |
| 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 percpu_counter s_dirtyblocks_counter; |
| struct blockgroup_lock s_blockgroup_lock; |
| struct proc_dir_entry *s_proc; |
| |
| /* root of the per fs reservation window tree */ |
| spinlock_t s_rsv_window_lock; |
| struct rb_root s_rsv_window_root; |
| |
| /* 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; |
| spinlock_t s_md_lock; |
| tid_t s_last_transaction; |
| unsigned short *s_mb_offsets, *s_mb_maxs; |
| |
| /* tunables */ |
| unsigned long s_stripe; |
| unsigned int s_mb_stream_request; |
| unsigned int s_mb_max_to_scan; |
| unsigned int s_mb_min_to_scan; |
| unsigned int s_mb_stats; |
| unsigned int s_mb_order2_reqs; |
| unsigned int 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; |
| 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 */ |