linux/fs/btrfs/btrfs_inode.h
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   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#define BTRFS_INODE_NEEDS_FULL_SYNC             7
  42
  43/* in memory btrfs inode */
  44struct btrfs_inode {
  45        /* which subvolume this inode belongs to */
  46        struct btrfs_root *root;
  47
  48        /* key used to find this inode on disk.  This is used by the code
  49         * to read in roots of subvolumes
  50         */
  51        struct btrfs_key location;
  52
  53        /* Lock for counters */
  54        spinlock_t lock;
  55
  56        /* the extent_tree has caches of all the extent mappings to disk */
  57        struct extent_map_tree extent_tree;
  58
  59        /* the io_tree does range state (DIRTY, LOCKED etc) */
  60        struct extent_io_tree io_tree;
  61
  62        /* special utility tree used to record which mirrors have already been
  63         * tried when checksums fail for a given block
  64         */
  65        struct extent_io_tree io_failure_tree;
  66
  67        /* held while logging the inode in tree-log.c */
  68        struct mutex log_mutex;
  69
  70        /* held while doing delalloc reservations */
  71        struct mutex delalloc_mutex;
  72
  73        /* used to order data wrt metadata */
  74        struct btrfs_ordered_inode_tree ordered_tree;
  75
  76        /* list of all the delalloc inodes in the FS.  There are times we need
  77         * to write all the delalloc pages to disk, and this list is used
  78         * to walk them all.
  79         */
  80        struct list_head delalloc_inodes;
  81
  82        /*
  83         * list for tracking inodes that must be sent to disk before a
  84         * rename or truncate commit
  85         */
  86        struct list_head ordered_operations;
  87
  88        /* node for the red-black tree that links inodes in subvolume root */
  89        struct rb_node rb_node;
  90
  91        unsigned long runtime_flags;
  92
  93        /* full 64 bit generation number, struct vfs_inode doesn't have a big
  94         * enough field for this.
  95         */
  96        u64 generation;
  97
  98        /*
  99         * transid of the trans_handle that last modified this inode
 100         */
 101        u64 last_trans;
 102
 103        /*
 104         * log transid when this inode was last modified
 105         */
 106        u64 last_sub_trans;
 107
 108        /*
 109         * transid that last logged this inode
 110         */
 111        u64 logged_trans;
 112
 113        /* total number of bytes pending delalloc, used by stat to calc the
 114         * real block usage of the file
 115         */
 116        u64 delalloc_bytes;
 117
 118        /*
 119         * the size of the file stored in the metadata on disk.  data=ordered
 120         * means the in-memory i_size might be larger than the size on disk
 121         * because not all the blocks are written yet.
 122         */
 123        u64 disk_i_size;
 124
 125        /*
 126         * if this is a directory then index_cnt is the counter for the index
 127         * number for new files that are created
 128         */
 129        u64 index_cnt;
 130
 131        /* the fsync log has some corner cases that mean we have to check
 132         * directories to see if any unlinks have been done before
 133         * the directory was logged.  See tree-log.c for all the
 134         * details
 135         */
 136        u64 last_unlink_trans;
 137
 138        /*
 139         * Number of bytes outstanding that are going to need csums.  This is
 140         * used in ENOSPC accounting.
 141         */
 142        u64 csum_bytes;
 143
 144        /* flags field from the on disk inode */
 145        u32 flags;
 146
 147        /* a local copy of root's last_log_commit */
 148        unsigned long last_log_commit;
 149
 150        /*
 151         * Counters to keep track of the number of extent item's we may use due
 152         * to delalloc and such.  outstanding_extents is the number of extent
 153         * items we think we'll end up using, and reserved_extents is the number
 154         * of extent items we've reserved metadata for.
 155         */
 156        unsigned outstanding_extents;
 157        unsigned reserved_extents;
 158
 159        /*
 160         * always compress this one file
 161         */
 162        unsigned force_compress;
 163
 164        struct btrfs_delayed_node *delayed_node;
 165
 166        struct inode vfs_inode;
 167};
 168
 169extern unsigned char btrfs_filetype_table[];
 170
 171static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 172{
 173        return container_of(inode, struct btrfs_inode, vfs_inode);
 174}
 175
 176static inline u64 btrfs_ino(struct inode *inode)
 177{
 178        u64 ino = BTRFS_I(inode)->location.objectid;
 179
 180        /*
 181         * !ino: btree_inode
 182         * type == BTRFS_ROOT_ITEM_KEY: subvol dir
 183         */
 184        if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
 185                ino = inode->i_ino;
 186        return ino;
 187}
 188
 189static inline void btrfs_i_size_write(struct inode *inode, u64 size)
 190{
 191        i_size_write(inode, size);
 192        BTRFS_I(inode)->disk_i_size = size;
 193}
 194
 195static inline bool btrfs_is_free_space_inode(struct inode *inode)
 196{
 197        struct btrfs_root *root = BTRFS_I(inode)->root;
 198
 199        if (root == root->fs_info->tree_root &&
 200            btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
 201                return true;
 202        if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
 203                return true;
 204        return false;
 205}
 206
 207static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
 208{
 209        if (BTRFS_I(inode)->logged_trans == generation &&
 210            BTRFS_I(inode)->last_sub_trans <= BTRFS_I(inode)->last_log_commit)
 211                return 1;
 212        return 0;
 213}
 214
 215#endif
 216
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