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