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 <linux/hash.h> 23 #include "extent_map.h" 24 #include "extent_io.h" 25 #include "ordered-data.h" 26 #include "delayed-inode.h" 27 28 /* 29 * ordered_data_close is set by truncate when a file that used 30 * to have good data has been truncated to zero. When it is set 31 * the btrfs file release call will add this inode to the 32 * ordered operations list so that we make sure to flush out any 33 * new data the application may have written before commit. 34 */ 35 #define BTRFS_INODE_ORDERED_DATA_CLOSE 0 36 #define BTRFS_INODE_ORPHAN_META_RESERVED 1 37 #define BTRFS_INODE_DUMMY 2 38 #define BTRFS_INODE_IN_DEFRAG 3 39 #define BTRFS_INODE_DELALLOC_META_RESERVED 4 40 #define BTRFS_INODE_HAS_ORPHAN_ITEM 5 41 #define BTRFS_INODE_HAS_ASYNC_EXTENT 6 42 #define BTRFS_INODE_NEEDS_FULL_SYNC 7 43 #define BTRFS_INODE_COPY_EVERYTHING 8 44 #define BTRFS_INODE_IN_DELALLOC_LIST 9 45 #define BTRFS_INODE_READDIO_NEED_LOCK 10 46 #define BTRFS_INODE_HAS_PROPS 11 47 48 /* in memory btrfs inode */ 49 struct btrfs_inode { 50 /* which subvolume this inode belongs to */ 51 struct btrfs_root *root; 52 53 /* key used to find this inode on disk. This is used by the code 54 * to read in roots of subvolumes 55 */ 56 struct btrfs_key location; 57 58 /* Lock for counters */ 59 spinlock_t lock; 60 61 /* the extent_tree has caches of all the extent mappings to disk */ 62 struct extent_map_tree extent_tree; 63 64 /* the io_tree does range state (DIRTY, LOCKED etc) */ 65 struct extent_io_tree io_tree; 66 67 /* special utility tree used to record which mirrors have already been 68 * tried when checksums fail for a given block 69 */ 70 struct extent_io_tree io_failure_tree; 71 72 /* held while logging the inode in tree-log.c */ 73 struct mutex log_mutex; 74 75 /* held while doing delalloc reservations */ 76 struct mutex delalloc_mutex; 77 78 /* used to order data wrt metadata */ 79 struct btrfs_ordered_inode_tree ordered_tree; 80 81 /* list of all the delalloc inodes in the FS. There are times we need 82 * to write all the delalloc pages to disk, and this list is used 83 * to walk them all. 84 */ 85 struct list_head delalloc_inodes; 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 /* Keep track of who's O_SYNC/fsyncing currently */ 93 atomic_t sync_writers; 94 95 /* full 64 bit generation number, struct vfs_inode doesn't have a big 96 * enough field for this. 97 */ 98 u64 generation; 99 100 /* 101 * transid of the trans_handle that last modified this inode 102 */ 103 u64 last_trans; 104 105 /* 106 * transid that last logged this inode 107 */ 108 u64 logged_trans; 109 110 /* 111 * log transid when this inode was last modified 112 */ 113 int last_sub_trans; 114 115 /* a local copy of root's last_log_commit */ 116 int last_log_commit; 117 118 /* total number of bytes pending delalloc, used by stat to calc the 119 * real block usage of the file 120 */ 121 u64 delalloc_bytes; 122 123 /* 124 * the size of the file stored in the metadata on disk. data=ordered 125 * means the in-memory i_size might be larger than the size on disk 126 * because not all the blocks are written yet. 127 */ 128 u64 disk_i_size; 129 130 /* 131 * if this is a directory then index_cnt is the counter for the index 132 * number for new files that are created 133 */ 134 u64 index_cnt; 135 136 /* Cache the directory index number to speed the dir/file remove */ 137 u64 dir_index; 138 139 /* the fsync log has some corner cases that mean we have to check 140 * directories to see if any unlinks have been done before 141 * the directory was logged. See tree-log.c for all the 142 * details 143 */ 144 u64 last_unlink_trans; 145 146 /* 147 * Number of bytes outstanding that are going to need csums. This is 148 * used in ENOSPC accounting. 149 */ 150 u64 csum_bytes; 151 152 /* flags field from the on disk inode */ 153 u32 flags; 154 155 /* 156 * Counters to keep track of the number of extent item's we may use due 157 * to delalloc and such. outstanding_extents is the number of extent 158 * items we think we'll end up using, and reserved_extents is the number 159 * of extent items we've reserved metadata for. 160 */ 161 unsigned outstanding_extents; 162 unsigned reserved_extents; 163 164 /* 165 * always compress this one file 166 */ 167 unsigned force_compress; 168 169 struct btrfs_delayed_node *delayed_node; 170 171 struct inode vfs_inode; 172 }; 173 174 extern unsigned char btrfs_filetype_table[]; 175 176 static inline struct btrfs_inode *BTRFS_I(struct inode *inode) 177 { 178 return container_of(inode, struct btrfs_inode, vfs_inode); 179 } 180 181 static inline unsigned long btrfs_inode_hash(u64 objectid, 182 const struct btrfs_root *root) 183 { 184 u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME); 185 186 #if BITS_PER_LONG == 32 187 h = (h >> 32) ^ (h & 0xffffffff); 188 #endif 189 190 return (unsigned long)h; 191 } 192 193 static inline void btrfs_insert_inode_hash(struct inode *inode) 194 { 195 unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root); 196 197 __insert_inode_hash(inode, h); 198 } 199 200 static inline u64 btrfs_ino(struct inode *inode) 201 { 202 u64 ino = BTRFS_I(inode)->location.objectid; 203 204 /* 205 * !ino: btree_inode 206 * type == BTRFS_ROOT_ITEM_KEY: subvol dir 207 */ 208 if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY) 209 ino = inode->i_ino; 210 return ino; 211 } 212 213 static inline void btrfs_i_size_write(struct inode *inode, u64 size) 214 { 215 i_size_write(inode, size); 216 BTRFS_I(inode)->disk_i_size = size; 217 } 218 219 static inline bool btrfs_is_free_space_inode(struct inode *inode) 220 { 221 struct btrfs_root *root = BTRFS_I(inode)->root; 222 223 if (root == root->fs_info->tree_root && 224 btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID) 225 return true; 226 if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) 227 return true; 228 return false; 229 } 230 231 static inline int btrfs_inode_in_log(struct inode *inode, u64 generation) 232 { 233 if (BTRFS_I(inode)->logged_trans == generation && 234 BTRFS_I(inode)->last_sub_trans <= 235 BTRFS_I(inode)->last_log_commit && 236 BTRFS_I(inode)->last_sub_trans <= 237 BTRFS_I(inode)->root->last_log_commit) { 238 /* 239 * After a ranged fsync we might have left some extent maps 240 * (that fall outside the fsync's range). So return false 241 * here if the list isn't empty, to make sure btrfs_log_inode() 242 * will be called and process those extent maps. 243 */ 244 smp_mb(); 245 if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents)) 246 return 1; 247 } 248 return 0; 249 } 250 251 struct btrfs_dio_private { 252 struct inode *inode; 253 u64 logical_offset; 254 u64 disk_bytenr; 255 u64 bytes; 256 void *private; 257 258 /* number of bios pending for this dio */ 259 atomic_t pending_bios; 260 261 /* IO errors */ 262 int errors; 263 264 /* orig_bio is our btrfs_io_bio */ 265 struct bio *orig_bio; 266 267 /* dio_bio came from fs/direct-io.c */ 268 struct bio *dio_bio; 269 u8 csum[0]; 270 }; 271 272 /* 273 * Disable DIO read nolock optimization, so new dio readers will be forced 274 * to grab i_mutex. It is used to avoid the endless truncate due to 275 * nonlocked dio read. 276 */ 277 static inline void btrfs_inode_block_unlocked_dio(struct inode *inode) 278 { 279 set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags); 280 smp_mb(); 281 } 282 283 static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode) 284 { 285 smp_mb__before_atomic(); 286 clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, 287 &BTRFS_I(inode)->runtime_flags); 288 } 289 290 bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end); 291 292 #endif 293