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_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;
50 unsigned short s_mount_state;
52 int s_addr_per_block_bits;
53 int s_desc_per_block_bits;
56 spinlock_t s_next_gen_lock;
57 u32 s_next_generation;
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;
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;
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_JBD2_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 */
81 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
82 int s_jquota_fmt; /* Format of quota to use */
84 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
87 /* ext4 extents stats */
88 unsigned long s_ext_min;
89 unsigned long s_ext_max;
90 unsigned long s_depth_max;
91 spinlock_t s_ext_stats_lock;
92 unsigned long s_ext_blocks;
93 unsigned long s_ext_extents;
97 #endif /* _LINUX_EXT4_FS_SB */