LXR linux/include/linux/ext2_fs

   1/*
   2 *  linux/include/linux/ext2_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_EXT2_FS_SB
  17#define _LINUX_EXT2_FS_SB
  18
  19#include <linux/blockgroup_lock.h>
  20#include <linux/percpu_counter.h>
  21#include <linux/rbtree.h>
  22
  23/* XXX Here for now... not interested in restructing headers JUST now */
  24
  25/* data type for block offset of block group */
  26typedef int ext2_grpblk_t;
  27
  28/* data type for filesystem-wide blocks number */
  29typedef unsigned long ext2_fsblk_t;
  30
  31#define E2FSBLK "%lu"
  32
  33struct ext2_reserve_window {
  34        ext2_fsblk_t            _rsv_start;     /* First byte reserved */
  35        ext2_fsblk_t            _rsv_end;       /* Last byte reserved or 0 */
  36};
  37
  38struct ext2_reserve_window_node {
  39        struct rb_node          rsv_node;
  40        __u32                   rsv_goal_size;
  41        __u32                   rsv_alloc_hit;
  42        struct ext2_reserve_window      rsv_window;
  43};
  44
  45struct ext2_block_alloc_info {
  46        /* information about reservation window */
  47        struct ext2_reserve_window_node rsv_window_node;
  48        /*
  49         * was i_next_alloc_block in ext2_inode_info
  50         * is the logical (file-relative) number of the
  51         * most-recently-allocated block in this file.
  52         * We use this for detecting linearly ascending allocation requests.
  53         */
  54        __u32                   last_alloc_logical_block;
  55        /*
  56         * Was i_next_alloc_goal in ext2_inode_info
  57         * is the *physical* companion to i_next_alloc_block.
  58         * it the the physical block number of the block which was most-recentl
  59         * allocated to this file.  This give us the goal (target) for the next
  60         * allocation when we detect linearly ascending requests.
  61         */
  62        ext2_fsblk_t            last_alloc_physical_block;
  63};
  64
  65#define rsv_start rsv_window._rsv_start
  66#define rsv_end rsv_window._rsv_end
  67
  68/*
  69 * second extended-fs super-block data in memory
  70 */
  71struct ext2_sb_info {
  72        unsigned long s_frag_size;      /* Size of a fragment in bytes */
  73        unsigned long s_frags_per_block;/* Number of fragments per block */
  74        unsigned long s_inodes_per_block;/* Number of inodes per block */
  75        unsigned long s_frags_per_group;/* Number of fragments in a group */
  76        unsigned long s_blocks_per_group;/* Number of blocks in a group */
  77        unsigned long s_inodes_per_group;/* Number of inodes in a group */
  78        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
  79        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
  80        unsigned long s_desc_per_block; /* Number of group descriptors per block */
  81        unsigned long s_groups_count;   /* Number of groups in the fs */
  82        unsigned long s_overhead_last;  /* Last calculated overhead */
  83        unsigned long s_blocks_last;    /* Last seen block count */
  84        struct buffer_head * s_sbh;     /* Buffer containing the super block */
  85        struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
  86        struct buffer_head ** s_group_desc;
  87        unsigned long  s_mount_opt;
  88        unsigned long s_sb_block;
  89        uid_t s_resuid;
  90        gid_t s_resgid;
  91        unsigned short s_mount_state;
  92        unsigned short s_pad;
  93        int s_addr_per_block_bits;
  94        int s_desc_per_block_bits;
  95        int s_inode_size;
  96        int s_first_ino;
  97        spinlock_t s_next_gen_lock;
  98        u32 s_next_generation;
  99        unsigned long s_dir_count;
 100        u8 *s_debts;
 101        struct percpu_counter s_freeblocks_counter;
 102        struct percpu_counter s_freeinodes_counter;
 103        struct percpu_counter s_dirs_counter;
 104        struct blockgroup_lock *s_blockgroup_lock;
 105        /* root of the per fs reservation window tree */
 106        spinlock_t s_rsv_window_lock;
 107        struct rb_root s_rsv_window_root;
 108        struct ext2_reserve_window_node s_rsv_window_head;
 109        /*
 110         * s_lock protects against concurrent modifications of s_mount_state,
 111         * s_blocks_last, s_overhead_last and the content of superblock's
 112         * buffer pointed to by sbi->s_es.
 113         *
 114         * Note: It is used in ext2_show_options() to provide a consistent view
 115         * of the mount options.
 116         */
 117        spinlock_t s_lock;
 118};
 119
 120static inline spinlock_t *
 121sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
 122{
 123        return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
 124}
 125
 126#endif  /* _LINUX_EXT2_FS_SB */
 127