include/linux/ext4_fs_sb.h

   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  */
  30 struct ext4_sb_info {
  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;
  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_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 */
  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         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
  83
  84 #ifdef EXTENTS_STATS
  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;
  92 #endif
  93 };
  94
  95 #endif  /* _LINUX_EXT4_FS_SB */