| /* | |
| * 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; | |
| int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
| 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; | |
| struct kobject s_kobj; | |
| struct completion s_kobj_unregister; | |
| /* Journaling */ | |
| struct inode *s_journal_inode; | |
| struct journal_s *s_journal; | |
| struct list_head s_orphan; | |
| unsigned long s_commit_interval; | |
| u32 s_max_batch_time; | |
| u32 s_min_batch_time; | |
| 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; | |
| unsigned int *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; | |
| /* for write statistics */ | |
| unsigned long s_sectors_written_start; | |
| u64 s_kbytes_written; | |
| unsigned int s_log_groups_per_flex; | |
| struct flex_groups *s_flex_groups; | |
| }; | |
| static inline spinlock_t * | |
| sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group) | |
| { | |
| return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); | |
| } | |
| #endif /* _EXT4_SB */ |