reactos/drivers/filesystems/ext2/inc/linux/ext3_fs_i.h

   1 /*
   2  *  linux/include/linux/ext3_fs_i.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_i.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _LINUX_EXT3_FS_I
  17 #define _LINUX_EXT3_FS_I
  18
  19 #include <linux/rbtree.h>
  20
  21 /* data type for block offset of block group */
  22 typedef int ext3_grpblk_t;
  23 typedef int ext4_grpblk_t;
  24
  25 /* data type for filesystem-wide blocks number */
  26 typedef unsigned long long ext3_fsblk_t;
  27 typedef unsigned long long ext4_fsblk_t;
  28
  29 /* data type for file logical block number */
  30 typedef __u32 ext3_lblk_t;
  31 typedef __u32 ext4_lblk_t;
  32
  33 /* data type for block group number */
  34 typedef unsigned int ext3_group_t;
  35 typedef unsigned int ext4_group_t;
  36
  37 #define E3FSBLK "%lu"
  38
  39 struct ext3_reserve_window {
  40     ext3_fsblk_t        _rsv_start;     /* First byte reserved */
  41     ext3_fsblk_t        _rsv_end;       /* Last byte reserved or 0 */
  42 };
  43
  44 struct ext3_reserve_window_node {
  45     struct rb_node              rsv_node;
  46     __u32                       rsv_goal_size;
  47     __u32                       rsv_alloc_hit;
  48     struct ext3_reserve_window  rsv_window;
  49 };
  50
  51 struct ext3_block_alloc_info {
  52     /* information about reservation window */
  53     struct ext3_reserve_window_node     rsv_window_node;
  54     /*
  55      * was i_next_alloc_block in ext3_inode_info
  56      * is the logical (file-relative) number of the
  57      * most-recently-allocated block in this file.
  58      * We use this for detecting linearly ascending allocation requests.
  59      */
  60     __u32                   last_alloc_logical_block;
  61     /*
  62      * Was i_next_alloc_goal in ext3_inode_info
  63      * is the *physical* companion to i_next_alloc_block.
  64      * it the physical block number of the block which was most-recentl
  65      * allocated to this file.  This give us the goal (target) for the next
  66      * allocation when we detect linearly ascending requests.
  67      */
  68     ext3_fsblk_t                last_alloc_physical_block;
  69 };
  70
  71 #define rsv_start rsv_window._rsv_start
  72 #define rsv_end rsv_window._rsv_end
  73
  74 /*
  75  * third extended file system inode data in memory
  76  */
  77 struct ext3_inode_info {
  78     __le32      i_data[15];     /* unconverted */
  79     __u32       i_flags;
  80 #ifdef EXT3_FRAGMENTS
  81     __u32       i_faddr;
  82     __u8        i_frag_no;
  83     __u8        i_frag_size;
  84 #endif
  85     ext3_fsblk_t        i_file_acl;
  86     __u32       i_dir_acl;
  87     __u32       i_dtime;
  88
  89     /*
  90      * i_block_group is the number of the block group which contains
  91      * this file's inode.  Constant across the lifetime of the inode,
  92      * it is ued for making block allocation decisions - we try to
  93      * place a file's data blocks near its inode block, and new inodes
  94      * near to their parent directory's inode.
  95      */
  96     __u32       i_block_group;
  97     __u32       i_state;                /* Dynamic state flags for ext3 */
  98
  99     /* block reservation info */
 100     struct ext3_block_alloc_info *i_block_alloc_info;
 101
 102     __u32       i_dir_start_lookup;
 103 #ifdef CONFIG_EXT3_FS_XATTR
 104     /*
 105      * Extended attributes can be read independently of the main file
 106      * data. Taking i_mutex even when reading would cause contention
 107      * between readers of EAs and writers of regular file data, so
 108      * instead we synchronize on xattr_sem when reading or changing
 109      * EAs.
 110      */
 111     struct rw_semaphore xattr_sem;
 112 #endif
 113 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 114     struct posix_acl    *i_acl;
 115     struct posix_acl    *i_default_acl;
 116 #endif
 117
 118     struct list_head i_orphan;  /* unlinked but open inodes */
 119
 120     /*
 121      * i_disksize keeps track of what the inode size is ON DISK, not
 122      * in memory.  During truncate, i_size is set to the new size by
 123      * the VFS prior to calling ext3_truncate(), but the filesystem won't
 124      * set i_disksize to 0 until the truncate is actually under way.
 125      *
 126      * The intent is that i_disksize always represents the blocks which
 127      * are used by this file.  This allows recovery to restart truncate
 128      * on orphans if we crash during truncate.  We actually write i_disksize
 129      * into the on-disk inode when writing inodes out, instead of i_size.
 130      *
 131      * The only time when i_disksize and i_size may be different is when
 132      * a truncate is in progress.  The only things which change i_disksize
 133      * are ext3_get_block (growth) and ext3_truncate (shrinkth).
 134      */
 135     loff_t      i_disksize;
 136
 137     /* on-disk additional length */
 138     __u16 i_extra_isize;
 139
 140 #if 0
 141     /*
 142      * truncate_mutex is for serialising ext3_truncate() against
 143      * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's
 144      * data tree are chopped off during truncate. We can't do that in
 145      * ext3 because whenever we perform intermediate commits during
 146      * truncate, the inode and all the metadata blocks *must* be in a
 147      * consistent state which allows truncation of the orphans to restart
 148      * during recovery.  Hence we must fix the get_block-vs-truncate race
 149      * by other means, so we have truncate_mutex.
 150      */
 151     struct mutex truncate_mutex;
 152 #endif
 153     struct inode vfs_inode;
 154 };
 155
 156 #endif  /* _LINUX_EXT3_FS_I */