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 logging the inode in tree-log.c */ 48 struct mutex log_mutex; 49 50 /* used to order data wrt metadata */ 51 struct btrfs_ordered_inode_tree ordered_tree; 52 53 /* for keeping track of orphaned inodes */ 54 struct list_head i_orphan; 55 56 /* list of all the delalloc inodes in the FS. There are times we need 57 * to write all the delalloc pages to disk, and this list is used 58 * to walk them all. 59 */ 60 struct list_head delalloc_inodes; 61 62 /* 63 * list for tracking inodes that must be sent to disk before a 64 * rename or truncate commit 65 */ 66 struct list_head ordered_operations; 67 68 /* node for the red-black tree that links inodes in subvolume root */ 69 struct rb_node rb_node; 70 71 /* the space_info for where this inode's data allocations are done */ 72 struct btrfs_space_info *space_info; 73 74 /* full 64 bit generation number, struct vfs_inode doesn't have a big 75 * enough field for this. 76 */ 77 u64 generation; 78 79 /* sequence number for NFS changes */ 80 u64 sequence; 81 82 /* 83 * transid of the trans_handle that last modified this inode 84 */ 85 u64 last_trans; 86 87 /* 88 * log transid when this inode was last modified 89 */ 90 u64 last_sub_trans; 91 92 /* 93 * transid that last logged this inode 94 */ 95 u64 logged_trans; 96 97 /* total number of bytes pending delalloc, used by stat to calc the 98 * real block usage of the file 99 */ 100 u64 delalloc_bytes; 101 102 /* total number of bytes that may be used for this inode for 103 * delalloc 104 */ 105 u64 reserved_bytes; 106 107 /* 108 * the size of the file stored in the metadata on disk. data=ordered 109 * means the in-memory i_size might be larger than the size on disk 110 * because not all the blocks are written yet. 111 */ 112 u64 disk_i_size; 113 114 /* flags field from the on disk inode */ 115 u32 flags; 116 117 /* 118 * if this is a directory then index_cnt is the counter for the index 119 * number for new files that are created 120 */ 121 u64 index_cnt; 122 123 /* the start of block group preferred for allocations. */ 124 u64 block_group; 125 126 /* the fsync log has some corner cases that mean we have to check 127 * directories to see if any unlinks have been done before 128 * the directory was logged. See tree-log.c for all the 129 * details 130 */ 131 u64 last_unlink_trans; 132 133 /* 134 * Counters to keep track of the number of extent item's we may use due 135 * to delalloc and such. outstanding_extents is the number of extent 136 * items we think we'll end up using, and reserved_extents is the number 137 * of extent items we've reserved metadata for. 138 */ 139 atomic_t outstanding_extents; 140 atomic_t reserved_extents; 141 142 /* 143 * ordered_data_close is set by truncate when a file that used 144 * to have good data has been truncated to zero. When it is set 145 * the btrfs file release call will add this inode to the 146 * ordered operations list so that we make sure to flush out any 147 * new data the application may have written before commit. 148 * 149 * yes, its silly to have a single bitflag, but we might grow more 150 * of these. 151 */ 152 unsigned ordered_data_close:1; 153 unsigned orphan_meta_reserved:1; 154 unsigned dummy_inode:1; 155 156 /* 157 * always compress this one file 158 */ 159 unsigned force_compress:4; 160 161 struct inode vfs_inode; 162 }; 163 164 static inline struct btrfs_inode *BTRFS_I(struct inode *inode) 165 { 166 return container_of(inode, struct btrfs_inode, vfs_inode); 167 } 168 169 static inline void btrfs_i_size_write(struct inode *inode, u64 size) 170 { 171 i_size_write(inode, size); 172 BTRFS_I(inode)->disk_i_size = size; 173 } 174 175 #endif 176