[deliverable/linux.git] / fs / ext4 / ext4_sb.h

/*
 *  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 */
Commit	Line	Data
ac27a0ec	1	/*
3dcf5451	2	* ext4_sb.h
ac27a0ec DK	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
3dcf5451 CH	16	#ifndef _EXT4_SB
3dcf5451 CH	17	#define _EXT4_SB
ac27a0ec DK	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	/*
8a35694e	28	* fourth extended-fs super-block data in memory
ac27a0ec	29	*/
617ba13b	30	struct ext4_sb_info {
0d1ee42f	31	unsigned long s_desc_size; /* Size of a group descriptor in bytes */
ac27a0ec	32	unsigned long s_inodes_per_block;/* Number of inodes per block */
ac27a0ec DK	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 */
fd2d4291	38	ext4_group_t s_groups_count; /* Number of groups in the fs */
5e70030d BP	39	unsigned long s_overhead_last; /* Last calculated overhead */
5e70030d BP	40	unsigned long s_blocks_last; /* Last seen block count */
e2b46574	41	loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
ac27a0ec	42	struct buffer_head * s_sbh; /* Buffer containing the super block */
af5bc92d TT	43	struct ext4_super_block s_es; / Pointer to the super block in the buffer */
af5bc92d TT	44	struct buffer_head **s_group_desc;
ac27a0ec	45	unsigned long s_mount_opt;
d9c9bef1	46	ext4_fsblk_t s_sb_block;
ac27a0ec DK	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;
240799cd	55	unsigned int s_inode_readahead_blks;
ac27a0ec DK	56	spinlock_t s_next_gen_lock;
	57	u32 s_next_generation;
	58	u32 s_hash_seed[4];
	59	int s_def_hash_version;
f99b2589	60	int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
ac27a0ec DK	61	struct percpu_counter s_freeblocks_counter;
	62	struct percpu_counter s_freeinodes_counter;
	63	struct percpu_counter s_dirs_counter;
6bc6e63f	64	struct percpu_counter s_dirtyblocks_counter;
705895b6	65	struct blockgroup_lock *s_blockgroup_lock;
9f6200bb	66	struct proc_dir_entry *s_proc;
3197ebdb TT	67	struct kobject s_kobj;
3197ebdb TT	68	struct completion s_kobj_unregister;
ac27a0ec	69
ac27a0ec	70	/* Journaling */
af5bc92d TT	71	struct inode *s_journal_inode;
af5bc92d TT	72	struct journal_s *s_journal;
ac27a0ec DK	73	struct list_head s_orphan;
ac27a0ec DK	74	unsigned long s_commit_interval;
30773840 TT	75	u32 s_max_batch_time;
30773840 TT	76	u32 s_min_batch_time;
ac27a0ec	77	struct block_device *journal_bdev;
e23291b9	78	#ifdef CONFIG_JBD2_DEBUG
ac27a0ec DK	79	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
ef7f3835	86	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
a86c6181 AT	87
	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
c9de560d AT	97
	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;
c9de560d AT	103	spinlock_t s_md_lock;
c9de560d AT	104	tid_t s_last_transaction;
ff7ef329 YG	105	unsigned short *s_mb_offsets;
ff7ef329 YG	106	unsigned int *s_mb_maxs;
c9de560d AT	107
	108	/* tunables */
	109	unsigned long s_stripe;
5e8814f2 TT	110	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;
c9de560d AT	116	/* 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;
c9de560d AT	125	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;
772cb7c8	146
afc32f7e TT	147	/* for write statistics */
	148	unsigned long s_sectors_written_start;
	149	u64 s_kbytes_written;
	150
772cb7c8 JS	151	unsigned int s_log_groups_per_flex;
772cb7c8 JS	152	struct flex_groups *s_flex_groups;
ac27a0ec DK	153	};
ac27a0ec DK	154
c644f0e4 PE	155	static inline spinlock_t *
	156	sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
	157	{
705895b6	158	return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
c644f0e4 PE	159	}
c644f0e4 PE	160
3dcf5451	161	#endif /* _EXT4_SB */