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_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;
  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         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;
  64
  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;
  69
  70         /* Journaling */
  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 */
  79 #endif
  80 #ifdef CONFIG_QUOTA
  81         char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
  82         int s_jquota_fmt;                       /* Format of quota to use */
  83 #endif
  84         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
  85
  86 #ifdef EXTENTS_STATS
  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;
  94 #endif
  95 };
  96
  97 #endif  /* _LINUX_EXT4_FS_SB */