LXR linux/include/linux/ext3_fs

   1/*
   2 *  linux/include/linux/ext3_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_EXT3_FS_SB
  17#define _LINUX_EXT3_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 ext3_sb_info {
  31        unsigned long s_frag_size;      /* Size of a fragment in bytes */
  32        unsigned long s_frags_per_block;/* Number of fragments per block */
  33        unsigned long s_inodes_per_block;/* Number of inodes per block */
  34        unsigned long s_frags_per_group;/* Number of fragments in a group */
  35        unsigned long s_blocks_per_group;/* Number of blocks in a group */
  36        unsigned long s_inodes_per_group;/* Number of inodes in a group */
  37        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
  38        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
  39        unsigned long s_desc_per_block; /* Number of group descriptors per block */
  40        unsigned long s_groups_count;   /* Number of groups in the fs */
  41        unsigned long s_overhead_last;  /* Last calculated overhead */
  42        unsigned long s_blocks_last;    /* Last seen block count */
  43        struct buffer_head * s_sbh;     /* Buffer containing the super block */
  44        struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
  45        struct buffer_head ** s_group_desc;
  46        unsigned long  s_mount_opt;
  47        ext3_fsblk_t s_sb_block;
  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        int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
  61        struct percpu_counter s_freeblocks_counter;
  62        struct percpu_counter s_freeinodes_counter;
  63        struct percpu_counter s_dirs_counter;
  64        struct blockgroup_lock *s_blockgroup_lock;
  65
  66        /* root of the per fs reservation window tree */
  67        spinlock_t s_rsv_window_lock;
  68        struct rb_root s_rsv_window_root;
  69        struct ext3_reserve_window_node s_rsv_window_head;
  70
  71        /* Journaling */
  72        struct inode * s_journal_inode;
  73        struct journal_s * s_journal;
  74        struct list_head s_orphan;
  75        unsigned long s_commit_interval;
  76        struct block_device *journal_bdev;
  77#ifdef CONFIG_JBD_DEBUG
  78        struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */
  79        wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */
  80#endif
  81#ifdef CONFIG_QUOTA
  82        char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
  83        int s_jquota_fmt;                       /* Format of quota to use */
  84#endif
  85};
  86
  87static inline spinlock_t *
  88sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
  89{
  90        return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
  91}
  92
  93#endif  /* _LINUX_EXT3_FS_SB */
  94