fs/btrfs/btrfs_inode.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_I__
  20 #define __BTRFS_I__
  21
  22 #include "extent_map.h"
  23 #include "extent_io.h"
  24 #include "ordered-data.h"
  25
  26 /* in memory btrfs inode */
  27 struct btrfs_inode {
  28         /* which subvolume this inode belongs to */
  29         struct btrfs_root *root;
  30
  31         /* key used to find this inode on disk.  This is used by the code
  32          * to read in roots of subvolumes
  33          */
  34         struct btrfs_key location;
  35
  36         /* the extent_tree has caches of all the extent mappings to disk */
  37         struct extent_map_tree extent_tree;
  38
  39         /* the io_tree does range state (DIRTY, LOCKED etc) */
  40         struct extent_io_tree io_tree;
  41
  42         /* special utility tree used to record which mirrors have already been
  43          * tried when checksums fail for a given block
  44          */
  45         struct extent_io_tree io_failure_tree;
  46
  47         /* held while inesrting or deleting extents from files */
  48         struct mutex extent_mutex;
  49
  50         /* held while logging the inode in tree-log.c */
  51         struct mutex log_mutex;
  52
  53         /* used to order data wrt metadata */
  54         struct btrfs_ordered_inode_tree ordered_tree;
  55
  56         /* for keeping track of orphaned inodes */
  57         struct list_head i_orphan;
  58
  59         /* list of all the delalloc inodes in the FS.  There are times we need
  60          * to write all the delalloc pages to disk, and this list is used
  61          * to walk them all.
  62          */
  63         struct list_head delalloc_inodes;
  64
  65         /*
  66          * list for tracking inodes that must be sent to disk before a
  67          * rename or truncate commit
  68          */
  69         struct list_head ordered_operations;
  70
  71         /* node for the red-black tree that links inodes in subvolume root */
  72         struct rb_node rb_node;
  73
  74         /* the space_info for where this inode's data allocations are done */
  75         struct btrfs_space_info *space_info;
  76
  77         /* full 64 bit generation number, struct vfs_inode doesn't have a big
  78          * enough field for this.
  79          */
  80         u64 generation;
  81
  82         /* sequence number for NFS changes */
  83         u64 sequence;
  84
  85         /*
  86          * transid of the trans_handle that last modified this inode
  87          */
  88         u64 last_trans;
  89         /*
  90          * transid that last logged this inode
  91          */
  92         u64 logged_trans;
  93
  94         /* total number of bytes pending delalloc, used by stat to calc the
  95          * real block usage of the file
  96          */
  97         u64 delalloc_bytes;
  98
  99         /* total number of bytes that may be used for this inode for
 100          * delalloc
 101          */
 102         u64 reserved_bytes;
 103
 104         /*
 105          * the size of the file stored in the metadata on disk.  data=ordered
 106          * means the in-memory i_size might be larger than the size on disk
 107          * because not all the blocks are written yet.
 108          */
 109         u64 disk_i_size;
 110
 111         /* flags field from the on disk inode */
 112         u32 flags;
 113
 114         /*
 115          * if this is a directory then index_cnt is the counter for the index
 116          * number for new files that are created
 117          */
 118         u64 index_cnt;
 119
 120         /* the start of block group preferred for allocations. */
 121         u64 block_group;
 122
 123         /* the fsync log has some corner cases that mean we have to check
 124          * directories to see if any unlinks have been done before
 125          * the directory was logged.  See tree-log.c for all the
 126          * details
 127          */
 128         u64 last_unlink_trans;
 129
 130         /*
 131          * Counters to keep track of the number of extent item's we may use due
 132          * to delalloc and such.  outstanding_extents is the number of extent
 133          * items we think we'll end up using, and reserved_extents is the number
 134          * of extent items we've reserved metadata for.
 135          */
 136         spinlock_t accounting_lock;
 137         int reserved_extents;
 138         int outstanding_extents;
 139
 140         /*
 141          * ordered_data_close is set by truncate when a file that used
 142          * to have good data has been truncated to zero.  When it is set
 143          * the btrfs file release call will add this inode to the
 144          * ordered operations list so that we make sure to flush out any
 145          * new data the application may have written before commit.
 146          *
 147          * yes, its silly to have a single bitflag, but we might grow more
 148          * of these.
 149          */
 150         unsigned ordered_data_close:1;
 151         unsigned dummy_inode:1;
 152
 153         struct inode vfs_inode;
 154 };
 155
 156 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 157 {
 158         return container_of(inode, struct btrfs_inode, vfs_inode);
 159 }
 160
 161 static inline void btrfs_i_size_write(struct inode *inode, u64 size)
 162 {
 163         inode->i_size = size;
 164         BTRFS_I(inode)->disk_i_size = size;
 165 }
 166
 167 #endif