1/*
 2 *  linux/include/linux/ext3_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_EXT3_FS_SB
17#define _LINUX_EXT3_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 ext3_sb_info {
31	unsigned long s_frag_size;	/* Size of a fragment in bytes */
32	unsigned long s_frags_per_block;/* Number of fragments per block */
33	unsigned long s_inodes_per_block;/* Number of inodes per block */
34	unsigned long s_frags_per_group;/* Number of fragments in a group */
35	unsigned long s_blocks_per_group;/* Number of blocks in a group */
36	unsigned long s_inodes_per_group;/* Number of inodes in a group */
37	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
38	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
39	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
40	unsigned long s_groups_count;	/* Number of groups in the fs */
41	unsigned long s_overhead_last;  /* Last calculated overhead */
42	unsigned long s_blocks_last;    /* Last seen block count */
43	struct buffer_head * s_sbh;	/* Buffer containing the super block */
44	struct ext3_super_block * s_es;	/* Pointer to the super block in the buffer */
45	struct buffer_head ** s_group_desc;
46	unsigned long  s_mount_opt;
47	ext3_fsblk_t s_sb_block;
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	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
61	struct percpu_counter s_freeblocks_counter;
62	struct percpu_counter s_freeinodes_counter;
63	struct percpu_counter s_dirs_counter;
64	struct blockgroup_lock *s_blockgroup_lock;
65
66	/* root of the per fs reservation window tree */
67	spinlock_t s_rsv_window_lock;
68	struct rb_root s_rsv_window_root;
69	struct ext3_reserve_window_node s_rsv_window_head;
70
71	/* Journaling */
72	struct inode * s_journal_inode;
73	struct journal_s * s_journal;
74	struct list_head s_orphan;
75	struct mutex s_orphan_lock;
76	struct mutex s_resize_lock;
77	unsigned long s_commit_interval;
78	struct block_device *journal_bdev;
79#ifdef CONFIG_JBD_DEBUG
80	struct timer_list turn_ro_timer;	/* For turning read-only (crash simulation) */
81	wait_queue_head_t ro_wait_queue;	/* For people waiting for the fs to go read-only */
82#endif
83#ifdef CONFIG_QUOTA
84	char *s_qf_names[MAXQUOTAS];		/* Names of quota files with journalled quota */
85	int s_jquota_fmt;			/* Format of quota to use */
86#endif
87};
88
89static inline spinlock_t *
90sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
91{
92	return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
93}
94
95#endif	/* _LINUX_EXT3_FS_SB */