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6cbd5570 CM |
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 | ||
2c90e5d6 CM |
19 | #ifndef __BTRFS_I__ |
20 | #define __BTRFS_I__ | |
21 | ||
778ba82b | 22 | #include <linux/hash.h> |
a52d9a80 | 23 | #include "extent_map.h" |
d1310b2e | 24 | #include "extent_io.h" |
e6dcd2dc | 25 | #include "ordered-data.h" |
16cdcec7 | 26 | #include "delayed-inode.h" |
a52d9a80 | 27 | |
72ac3c0d JB |
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 | |
8a35d95f | 40 | #define BTRFS_INODE_HAS_ORPHAN_ITEM 5 |
7ddf5a42 | 41 | #define BTRFS_INODE_HAS_ASYNC_EXTENT 6 |
5dc562c5 | 42 | #define BTRFS_INODE_NEEDS_FULL_SYNC 7 |
e9976151 | 43 | #define BTRFS_INODE_COPY_EVERYTHING 8 |
df0af1a5 | 44 | #define BTRFS_INODE_IN_DELALLOC_LIST 9 |
2e60a51e | 45 | #define BTRFS_INODE_READDIO_NEED_LOCK 10 |
63541927 | 46 | #define BTRFS_INODE_HAS_PROPS 11 |
656f30db FM |
47 | /* |
48 | * The following 3 bits are meant only for the btree inode. | |
49 | * When any of them is set, it means an error happened while writing an | |
50 | * extent buffer belonging to: | |
51 | * 1) a non-log btree | |
52 | * 2) a log btree and first log sub-transaction | |
53 | * 3) a log btree and second log sub-transaction | |
54 | */ | |
55 | #define BTRFS_INODE_BTREE_ERR 12 | |
56 | #define BTRFS_INODE_BTREE_LOG1_ERR 13 | |
57 | #define BTRFS_INODE_BTREE_LOG2_ERR 14 | |
72ac3c0d | 58 | |
f1ace244 | 59 | /* in memory btrfs inode */ |
2c90e5d6 | 60 | struct btrfs_inode { |
d352ac68 | 61 | /* which subvolume this inode belongs to */ |
d6e4a428 | 62 | struct btrfs_root *root; |
d352ac68 | 63 | |
d352ac68 CM |
64 | /* key used to find this inode on disk. This is used by the code |
65 | * to read in roots of subvolumes | |
66 | */ | |
d6e4a428 | 67 | struct btrfs_key location; |
d352ac68 | 68 | |
9e0baf60 JB |
69 | /* Lock for counters */ |
70 | spinlock_t lock; | |
71 | ||
d352ac68 | 72 | /* the extent_tree has caches of all the extent mappings to disk */ |
a52d9a80 | 73 | struct extent_map_tree extent_tree; |
d352ac68 CM |
74 | |
75 | /* the io_tree does range state (DIRTY, LOCKED etc) */ | |
d1310b2e | 76 | struct extent_io_tree io_tree; |
d352ac68 CM |
77 | |
78 | /* special utility tree used to record which mirrors have already been | |
79 | * tried when checksums fail for a given block | |
80 | */ | |
7e38326f | 81 | struct extent_io_tree io_failure_tree; |
d352ac68 | 82 | |
d352ac68 | 83 | /* held while logging the inode in tree-log.c */ |
e02119d5 | 84 | struct mutex log_mutex; |
d352ac68 | 85 | |
f248679e JB |
86 | /* held while doing delalloc reservations */ |
87 | struct mutex delalloc_mutex; | |
88 | ||
d352ac68 | 89 | /* used to order data wrt metadata */ |
e6dcd2dc | 90 | struct btrfs_ordered_inode_tree ordered_tree; |
15ee9bc7 | 91 | |
d352ac68 CM |
92 | /* list of all the delalloc inodes in the FS. There are times we need |
93 | * to write all the delalloc pages to disk, and this list is used | |
94 | * to walk them all. | |
95 | */ | |
ea8c2819 CM |
96 | struct list_head delalloc_inodes; |
97 | ||
5d4f98a2 YZ |
98 | /* node for the red-black tree that links inodes in subvolume root */ |
99 | struct rb_node rb_node; | |
100 | ||
72ac3c0d JB |
101 | unsigned long runtime_flags; |
102 | ||
9c931c5a | 103 | /* Keep track of who's O_SYNC/fsyncing currently */ |
b812ce28 JB |
104 | atomic_t sync_writers; |
105 | ||
d352ac68 CM |
106 | /* full 64 bit generation number, struct vfs_inode doesn't have a big |
107 | * enough field for this. | |
108 | */ | |
e02119d5 CM |
109 | u64 generation; |
110 | ||
15ee9bc7 JB |
111 | /* |
112 | * transid of the trans_handle that last modified this inode | |
113 | */ | |
114 | u64 last_trans; | |
257c62e1 CM |
115 | |
116 | /* | |
bb14a59b | 117 | * transid that last logged this inode |
257c62e1 | 118 | */ |
bb14a59b | 119 | u64 logged_trans; |
257c62e1 | 120 | |
e02119d5 | 121 | /* |
bb14a59b | 122 | * log transid when this inode was last modified |
e02119d5 | 123 | */ |
bb14a59b MX |
124 | int last_sub_trans; |
125 | ||
126 | /* a local copy of root's last_log_commit */ | |
127 | int last_log_commit; | |
49eb7e46 | 128 | |
d352ac68 CM |
129 | /* total number of bytes pending delalloc, used by stat to calc the |
130 | * real block usage of the file | |
131 | */ | |
9069218d | 132 | u64 delalloc_bytes; |
d352ac68 | 133 | |
47059d93 WS |
134 | /* |
135 | * total number of bytes pending defrag, used by stat to check whether | |
136 | * it needs COW. | |
137 | */ | |
138 | u64 defrag_bytes; | |
139 | ||
d352ac68 CM |
140 | /* |
141 | * the size of the file stored in the metadata on disk. data=ordered | |
142 | * means the in-memory i_size might be larger than the size on disk | |
143 | * because not all the blocks are written yet. | |
144 | */ | |
dbe674a9 | 145 | u64 disk_i_size; |
d352ac68 | 146 | |
aec7477b JB |
147 | /* |
148 | * if this is a directory then index_cnt is the counter for the index | |
149 | * number for new files that are created | |
150 | */ | |
151 | u64 index_cnt; | |
d352ac68 | 152 | |
67de1176 MX |
153 | /* Cache the directory index number to speed the dir/file remove */ |
154 | u64 dir_index; | |
155 | ||
12fcfd22 CM |
156 | /* the fsync log has some corner cases that mean we have to check |
157 | * directories to see if any unlinks have been done before | |
158 | * the directory was logged. See tree-log.c for all the | |
159 | * details | |
160 | */ | |
161 | u64 last_unlink_trans; | |
162 | ||
7709cde3 JB |
163 | /* |
164 | * Number of bytes outstanding that are going to need csums. This is | |
165 | * used in ENOSPC accounting. | |
166 | */ | |
167 | u64 csum_bytes; | |
168 | ||
f1bdcc0a JB |
169 | /* flags field from the on disk inode */ |
170 | u32 flags; | |
171 | ||
9ed74f2d | 172 | /* |
32c00aff JB |
173 | * Counters to keep track of the number of extent item's we may use due |
174 | * to delalloc and such. outstanding_extents is the number of extent | |
175 | * items we think we'll end up using, and reserved_extents is the number | |
176 | * of extent items we've reserved metadata for. | |
9ed74f2d | 177 | */ |
9e0baf60 JB |
178 | unsigned outstanding_extents; |
179 | unsigned reserved_extents; | |
9ed74f2d | 180 | |
1e701a32 CM |
181 | /* |
182 | * always compress this one file | |
183 | */ | |
72ac3c0d | 184 | unsigned force_compress; |
1e701a32 | 185 | |
16cdcec7 MX |
186 | struct btrfs_delayed_node *delayed_node; |
187 | ||
d352ac68 | 188 | struct inode vfs_inode; |
2c90e5d6 | 189 | }; |
dbe674a9 | 190 | |
16cdcec7 MX |
191 | extern unsigned char btrfs_filetype_table[]; |
192 | ||
2c90e5d6 CM |
193 | static inline struct btrfs_inode *BTRFS_I(struct inode *inode) |
194 | { | |
195 | return container_of(inode, struct btrfs_inode, vfs_inode); | |
196 | } | |
197 | ||
778ba82b FDBM |
198 | static inline unsigned long btrfs_inode_hash(u64 objectid, |
199 | const struct btrfs_root *root) | |
200 | { | |
201 | u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME); | |
202 | ||
203 | #if BITS_PER_LONG == 32 | |
204 | h = (h >> 32) ^ (h & 0xffffffff); | |
205 | #endif | |
206 | ||
207 | return (unsigned long)h; | |
208 | } | |
209 | ||
210 | static inline void btrfs_insert_inode_hash(struct inode *inode) | |
211 | { | |
212 | unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root); | |
213 | ||
214 | __insert_inode_hash(inode, h); | |
215 | } | |
216 | ||
33345d01 LZ |
217 | static inline u64 btrfs_ino(struct inode *inode) |
218 | { | |
219 | u64 ino = BTRFS_I(inode)->location.objectid; | |
220 | ||
14c7cca7 LB |
221 | /* |
222 | * !ino: btree_inode | |
223 | * type == BTRFS_ROOT_ITEM_KEY: subvol dir | |
224 | */ | |
225 | if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY) | |
33345d01 LZ |
226 | ino = inode->i_ino; |
227 | return ino; | |
228 | } | |
229 | ||
dbe674a9 CM |
230 | static inline void btrfs_i_size_write(struct inode *inode, u64 size) |
231 | { | |
c2167754 | 232 | i_size_write(inode, size); |
dbe674a9 CM |
233 | BTRFS_I(inode)->disk_i_size = size; |
234 | } | |
235 | ||
83eea1f1 | 236 | static inline bool btrfs_is_free_space_inode(struct inode *inode) |
2cf8572d | 237 | { |
83eea1f1 LB |
238 | struct btrfs_root *root = BTRFS_I(inode)->root; |
239 | ||
51a8cf9d LB |
240 | if (root == root->fs_info->tree_root && |
241 | btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID) | |
242 | return true; | |
243 | if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) | |
2cf8572d CM |
244 | return true; |
245 | return false; | |
246 | } | |
247 | ||
22ee6985 JB |
248 | static inline int btrfs_inode_in_log(struct inode *inode, u64 generation) |
249 | { | |
22ee6985 | 250 | if (BTRFS_I(inode)->logged_trans == generation && |
a5874ce6 JB |
251 | BTRFS_I(inode)->last_sub_trans <= |
252 | BTRFS_I(inode)->last_log_commit && | |
253 | BTRFS_I(inode)->last_sub_trans <= | |
125c4cf9 FM |
254 | BTRFS_I(inode)->root->last_log_commit) { |
255 | /* | |
256 | * After a ranged fsync we might have left some extent maps | |
257 | * (that fall outside the fsync's range). So return false | |
258 | * here if the list isn't empty, to make sure btrfs_log_inode() | |
259 | * will be called and process those extent maps. | |
260 | */ | |
261 | smp_mb(); | |
262 | if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents)) | |
263 | return 1; | |
264 | } | |
46d8bc34 | 265 | return 0; |
22ee6985 JB |
266 | } |
267 | ||
c1dc0896 MX |
268 | #define BTRFS_DIO_ORIG_BIO_SUBMITTED 0x1 |
269 | ||
facc8a22 MX |
270 | struct btrfs_dio_private { |
271 | struct inode *inode; | |
c1dc0896 | 272 | unsigned long flags; |
facc8a22 MX |
273 | u64 logical_offset; |
274 | u64 disk_bytenr; | |
275 | u64 bytes; | |
276 | void *private; | |
277 | ||
278 | /* number of bios pending for this dio */ | |
279 | atomic_t pending_bios; | |
280 | ||
281 | /* IO errors */ | |
282 | int errors; | |
283 | ||
284 | /* orig_bio is our btrfs_io_bio */ | |
285 | struct bio *orig_bio; | |
286 | ||
287 | /* dio_bio came from fs/direct-io.c */ | |
288 | struct bio *dio_bio; | |
c1dc0896 MX |
289 | |
290 | /* | |
291 | * The original bio may be splited to several sub-bios, this is | |
292 | * done during endio of sub-bios | |
293 | */ | |
8b110e39 | 294 | int (*subio_endio)(struct inode *, struct btrfs_io_bio *, int); |
facc8a22 MX |
295 | }; |
296 | ||
2e60a51e MX |
297 | /* |
298 | * Disable DIO read nolock optimization, so new dio readers will be forced | |
299 | * to grab i_mutex. It is used to avoid the endless truncate due to | |
300 | * nonlocked dio read. | |
301 | */ | |
302 | static inline void btrfs_inode_block_unlocked_dio(struct inode *inode) | |
303 | { | |
304 | set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags); | |
305 | smp_mb(); | |
306 | } | |
307 | ||
308 | static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode) | |
309 | { | |
4e857c58 | 310 | smp_mb__before_atomic(); |
2e60a51e MX |
311 | clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
312 | &BTRFS_I(inode)->runtime_flags); | |
313 | } | |
314 | ||
fc4adbff AG |
315 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end); |
316 | ||
2c90e5d6 | 317 | #endif |