LCOV - code coverage report
Current view: top level - lkbce/include/linux - ext2_fs_sb.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 7 7 100.0 %
Date: 2017-01-25 Functions: 1 1 100.0 %

          Line data    Source code
       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 */
      26           1 : typedef int ext2_grpblk_t;
      27             : 
      28             : /* data type for filesystem-wide blocks number */
      29           1 : typedef unsigned long ext2_fsblk_t;
      30           1 : 
      31             : #define E2FSBLK "%lu"
      32             : 
      33             : struct 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           1 : 
      38             : struct 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           1 : 
      45             : struct 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           2 : 
      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             :  */
      71             : struct 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             : 
     111             : static inline spinlock_t *
     112             : sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
     113             : {
     114        5088 :         return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
     115             : }
     116             : 
     117             : #endif  /* _LINUX_EXT2_FS_SB */

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