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Commit	Line	Data
	1	/*
	2	* linux/include/linux/ext4_fs_sb.h
	3	*
	4	* Copyright (C) 1992, 1993, 1994, 1995
	5	* Remy Card ([email protected])
	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 _LINUX_EXT4_FS_SB
	17	#define _LINUX_EXT4_FS_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	* third extended-fs super-block data in memory
	29	*/
	30	struct ext4_sb_info {
	31	unsigned long s_frag_size; /* Size of a fragment in bytes */
	32	unsigned long s_desc_size; /* Size of a group descriptor in bytes */
	33	unsigned long s_frags_per_block;/* Number of fragments per block */
	34	unsigned long s_inodes_per_block;/* Number of inodes per block */
	35	unsigned long s_frags_per_group;/* Number of fragments in a group */
	36	unsigned long s_blocks_per_group;/* Number of blocks in a group */
	37	unsigned long s_inodes_per_group;/* Number of inodes in a group */
	38	unsigned long s_itb_per_group; /* Number of inode table blocks per group */
	39	unsigned long s_gdb_count; /* Number of group descriptor blocks */
	40	unsigned long s_desc_per_block; /* Number of group descriptors per block */
	41	unsigned long s_groups_count; /* Number of groups in the fs */
	42	unsigned long s_overhead_last; /* Last calculated overhead */
	43	unsigned long s_blocks_last; /* Last seen block count */
	44	struct buffer_head * s_sbh; /* Buffer containing the super block */
	45	struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
	46	struct buffer_head ** s_group_desc;
	47	unsigned long s_mount_opt;
	48	uid_t s_resuid;
	49	gid_t s_resgid;
	50	unsigned short s_mount_state;
	51	unsigned short s_pad;
	52	int s_addr_per_block_bits;
	53	int s_desc_per_block_bits;
	54	int s_inode_size;
	55	int s_first_ino;
	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	struct percpu_counter s_freeblocks_counter;
	61	struct percpu_counter s_freeinodes_counter;
	62	struct percpu_counter s_dirs_counter;
	63	struct blockgroup_lock s_blockgroup_lock;
	64
	65	/* root of the per fs reservation window tree */
	66	spinlock_t s_rsv_window_lock;
	67	struct rb_root s_rsv_window_root;
	68	struct ext4_reserve_window_node s_rsv_window_head;
	69
	70	/* Journaling */
	71	struct inode * s_journal_inode;
	72	struct journal_s * s_journal;
	73	struct list_head s_orphan;
	74	unsigned long s_commit_interval;
	75	struct block_device *journal_bdev;
	76	#ifdef CONFIG_JBD_DEBUG
	77	struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
	78	wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
	79	#endif
	80	#ifdef CONFIG_QUOTA
	81	char s_qf_names[MAXQUOTAS]; / Names of quota files with journalled quota */
	82	int s_jquota_fmt; /* Format of quota to use */
	83	#endif
	84
	85	#ifdef EXTENTS_STATS
	86	/* ext4 extents stats */
	87	unsigned long s_ext_min;
	88	unsigned long s_ext_max;
	89	unsigned long s_depth_max;
	90	spinlock_t s_ext_stats_lock;
	91	unsigned long s_ext_blocks;
	92	unsigned long s_ext_extents;
	93	#endif
	94	};
	95
	96	#endif /* _LINUX_EXT4_FS_SB */