1/*
2 *  linux/include/linux/ext4_fs_sb.h
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
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 */
30struct 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	struct buffer_head * s_sbh;	/* Buffer containing the super block */
43	struct ext4_super_block * s_es;	/* Pointer to the super block in the buffer */
44	struct buffer_head ** s_group_desc;
45	unsigned long  s_mount_opt;
46	uid_t s_resuid;
47	gid_t s_resgid;
48	unsigned short s_mount_state;
49	unsigned short s_pad;
50	int s_addr_per_block_bits;
51	int s_desc_per_block_bits;
52	int s_inode_size;
53	int s_first_ino;
54	spinlock_t s_next_gen_lock;
55	u32 s_next_generation;
56	u32 s_hash_seed[4];
57	int s_def_hash_version;
58	struct percpu_counter s_freeblocks_counter;
59	struct percpu_counter s_freeinodes_counter;
60	struct percpu_counter s_dirs_counter;
61	struct blockgroup_lock s_blockgroup_lock;
62
63	/* root of the per fs reservation window tree */
64	spinlock_t s_rsv_window_lock;
65	struct rb_root s_rsv_window_root;
66	struct ext4_reserve_window_node s_rsv_window_head;
67
68	/* Journaling */
69	struct inode * s_journal_inode;
70	struct journal_s * s_journal;
71	struct list_head s_orphan;
72	unsigned long s_commit_interval;
73	struct block_device *journal_bdev;
74#ifdef CONFIG_JBD_DEBUG
75	struct timer_list turn_ro_timer;	/* For turning read-only (crash simulation) */
76	wait_queue_head_t ro_wait_queue;	/* For people waiting for the fs to go read-only */
77#endif
78#ifdef CONFIG_QUOTA
79	char *s_qf_names[MAXQUOTAS];		/* Names of quota files with journalled quota */
80	int s_jquota_fmt;			/* Format of quota to use */
81#endif
82
83#ifdef EXTENTS_STATS
84	/* ext4 extents stats */
85	unsigned long s_ext_min;
86	unsigned long s_ext_max;
87	unsigned long s_depth_max;
88	spinlock_t s_ext_stats_lock;
89	unsigned long s_ext_blocks;
90	unsigned long s_ext_extents;
91#endif
92};
93
94#endif	/* _LINUX_EXT4_FS_SB */
95