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 #include "delayed-inode.h"
  26
  27 /*
  28  * ordered_data_close is set by truncate when a file that used
  29  * to have good data has been truncated to zero.  When it is set
  30  * the btrfs file release call will add this inode to the
  31  * ordered operations list so that we make sure to flush out any
  32  * new data the application may have written before commit.
  33  */
  34 #define BTRFS_INODE_ORDERED_DATA_CLOSE          0
  35 #define BTRFS_INODE_ORPHAN_META_RESERVED        1
  36 #define BTRFS_INODE_DUMMY                       2
  37 #define BTRFS_INODE_IN_DEFRAG                   3
  38 #define BTRFS_INODE_DELALLOC_META_RESERVED      4
  39 #define BTRFS_INODE_HAS_ORPHAN_ITEM             5
  40 #define BTRFS_INODE_HAS_ASYNC_EXTENT            6
  41
  42 /* in memory btrfs inode */
  43 struct btrfs_inode {
  44         /* which subvolume this inode belongs to */
  45         struct btrfs_root *root;
  46
  47         /* key used to find this inode on disk.  This is used by the code
  48          * to read in roots of subvolumes
  49          */
  50         struct btrfs_key location;
  51
  52         /* Lock for counters */
  53         spinlock_t lock;
  54
  55         /* the extent_tree has caches of all the extent mappings to disk */
  56         struct extent_map_tree extent_tree;
  57
  58         /* the io_tree does range state (DIRTY, LOCKED etc) */
  59         struct extent_io_tree io_tree;
  60
  61         /* special utility tree used to record which mirrors have already been
  62          * tried when checksums fail for a given block
  63          */
  64         struct extent_io_tree io_failure_tree;
  65
  66         /* held while logging the inode in tree-log.c */
  67         struct mutex log_mutex;
  68
  69         /* held while doing delalloc reservations */
  70         struct mutex delalloc_mutex;
  71
  72         /* used to order data wrt metadata */
  73         struct btrfs_ordered_inode_tree ordered_tree;
  74
  75         /* list of all the delalloc inodes in the FS.  There are times we need
  76          * to write all the delalloc pages to disk, and this list is used
  77          * to walk them all.
  78          */
  79         struct list_head delalloc_inodes;
  80
  81         /*
  82          * list for tracking inodes that must be sent to disk before a
  83          * rename or truncate commit
  84          */
  85         struct list_head ordered_operations;
  86
  87         /* node for the red-black tree that links inodes in subvolume root */
  88         struct rb_node rb_node;
  89
  90         unsigned long runtime_flags;
  91
  92         /* full 64 bit generation number, struct vfs_inode doesn't have a big
  93          * enough field for this.
  94          */
  95         u64 generation;
  96
  97         /*
  98          * transid of the trans_handle that last modified this inode
  99          */
 100         u64 last_trans;
 101
 102         /*
 103          * log transid when this inode was last modified
 104          */
 105         u64 last_sub_trans;
 106
 107         /*
 108          * transid that last logged this inode
 109          */
 110         u64 logged_trans;
 111
 112         /* total number of bytes pending delalloc, used by stat to calc the
 113          * real block usage of the file
 114          */
 115         u64 delalloc_bytes;
 116
 117         /*
 118          * the size of the file stored in the metadata on disk.  data=ordered
 119          * means the in-memory i_size might be larger than the size on disk
 120          * because not all the blocks are written yet.
 121          */
 122         u64 disk_i_size;
 123
 124         /*
 125          * if this is a directory then index_cnt is the counter for the index
 126          * number for new files that are created
 127          */
 128         u64 index_cnt;
 129
 130         /* the fsync log has some corner cases that mean we have to check
 131          * directories to see if any unlinks have been done before
 132          * the directory was logged.  See tree-log.c for all the
 133          * details
 134          */
 135         u64 last_unlink_trans;
 136
 137         /*
 138          * Number of bytes outstanding that are going to need csums.  This is
 139          * used in ENOSPC accounting.
 140          */
 141         u64 csum_bytes;
 142
 143         /* flags field from the on disk inode */
 144         u32 flags;
 145
 146         /*
 147          * Counters to keep track of the number of extent item's we may use due
 148          * to delalloc and such.  outstanding_extents is the number of extent
 149          * items we think we'll end up using, and reserved_extents is the number
 150          * of extent items we've reserved metadata for.
 151          */
 152         unsigned outstanding_extents;
 153         unsigned reserved_extents;
 154
 155         /*
 156          * always compress this one file
 157          */
 158         unsigned force_compress;
 159
 160         struct btrfs_delayed_node *delayed_node;
 161
 162         struct inode vfs_inode;
 163 };
 164
 165 extern unsigned char btrfs_filetype_table[];
 166
 167 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 168 {
 169         return container_of(inode, struct btrfs_inode, vfs_inode);
 170 }
 171
 172 static inline u64 btrfs_ino(struct inode *inode)
 173 {
 174         u64 ino = BTRFS_I(inode)->location.objectid;
 175
 176         /*
 177          * !ino: btree_inode
 178          * type == BTRFS_ROOT_ITEM_KEY: subvol dir
 179          */
 180         if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
 181                 ino = inode->i_ino;
 182         return ino;
 183 }
 184
 185 static inline void btrfs_i_size_write(struct inode *inode, u64 size)
 186 {
 187         i_size_write(inode, size);
 188         BTRFS_I(inode)->disk_i_size = size;
 189 }
 190
 191 static inline bool btrfs_is_free_space_inode(struct inode *inode)
 192 {
 193         struct btrfs_root *root = BTRFS_I(inode)->root;
 194
 195         if (root == root->fs_info->tree_root &&
 196             btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
 197                 return true;
 198         if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
 199                 return true;
 200         return false;
 201 }
 202
 203 static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
 204 {
 205         struct btrfs_root *root = BTRFS_I(inode)->root;
 206         int ret = 0;
 207
 208         mutex_lock(&root->log_mutex);
 209         if (BTRFS_I(inode)->logged_trans == generation &&
 210             BTRFS_I(inode)->last_sub_trans <= root->last_log_commit)
 211                 ret = 1;
 212         mutex_unlock(&root->log_mutex);
 213         return ret;
 214 }
 215
 216 #endif