2 * linux/include/linux/ext4_fs_sb.h
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)
11 * linux/include/linux/minix_fs_sb.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT4_FS_SB
17 #define _LINUX_EXT4_FS_SB
20 #include <linux/timer.h>
21 #include <linux/wait.h>
22 #include <linux/blockgroup_lock.h>
23 #include <linux/percpu_counter.h>
25 #include <linux/rbtree.h>
28 * third extended-fs super-block data in memory
31 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
32 unsigned long s_inodes_per_block;/* Number of inodes per block */
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 */
38 unsigned long s_groups_count; /* Number of groups in the fs */
39 unsigned long s_overhead_last; /* Last calculated overhead */
40 unsigned long s_blocks_last; /* Last seen block count */
41 struct buffer_head * s_sbh; /* Buffer containing the super block */
42 struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
43 struct buffer_head ** s_group_desc;
44 unsigned long s_mount_opt;
45 ext4_fsblk_t s_sb_block;
48 unsigned short s_mount_state;
50 int s_addr_per_block_bits;
51 int s_desc_per_block_bits;
54 spinlock_t s_next_gen_lock;
55 u32 s_next_generation;
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;
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;
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_JBD2_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 */
79 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
80 int s_jquota_fmt; /* Format of quota to use */
82 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
85 /* ext4 extents stats */
86 unsigned long s_ext_min;
87 unsigned long s_ext_max;
88 unsigned long s_depth_max;
89 spinlock_t s_ext_stats_lock;
90 unsigned long s_ext_blocks;
91 unsigned long s_ext_extents;
95 #endif /* _LINUX_EXT4_FS_SB */