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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 |
72ac3c0d | 47 | |
f1ace244 | 48 | /* in memory btrfs inode */ |
2c90e5d6 | 49 | struct btrfs_inode { |
d352ac68 | 50 | /* which subvolume this inode belongs to */ |
d6e4a428 | 51 | struct btrfs_root *root; |
d352ac68 | 52 | |
d352ac68 CM |
53 | /* key used to find this inode on disk. This is used by the code |
54 | * to read in roots of subvolumes | |
55 | */ | |
d6e4a428 | 56 | struct btrfs_key location; |
d352ac68 | 57 | |
9e0baf60 JB |
58 | /* Lock for counters */ |
59 | spinlock_t lock; | |
60 | ||
d352ac68 | 61 | /* the extent_tree has caches of all the extent mappings to disk */ |
a52d9a80 | 62 | struct extent_map_tree extent_tree; |
d352ac68 CM |
63 | |
64 | /* the io_tree does range state (DIRTY, LOCKED etc) */ | |
d1310b2e | 65 | struct extent_io_tree io_tree; |
d352ac68 CM |
66 | |
67 | /* special utility tree used to record which mirrors have already been | |
68 | * tried when checksums fail for a given block | |
69 | */ | |
7e38326f | 70 | struct extent_io_tree io_failure_tree; |
d352ac68 | 71 | |
d352ac68 | 72 | /* held while logging the inode in tree-log.c */ |
e02119d5 | 73 | struct mutex log_mutex; |
d352ac68 | 74 | |
f248679e JB |
75 | /* held while doing delalloc reservations */ |
76 | struct mutex delalloc_mutex; | |
77 | ||
d352ac68 | 78 | /* used to order data wrt metadata */ |
e6dcd2dc | 79 | struct btrfs_ordered_inode_tree ordered_tree; |
15ee9bc7 | 80 | |
d352ac68 CM |
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 | */ | |
ea8c2819 CM |
85 | struct list_head delalloc_inodes; |
86 | ||
5d4f98a2 YZ |
87 | /* node for the red-black tree that links inodes in subvolume root */ |
88 | struct rb_node rb_node; | |
89 | ||
72ac3c0d JB |
90 | unsigned long runtime_flags; |
91 | ||
9c931c5a | 92 | /* Keep track of who's O_SYNC/fsyncing currently */ |
b812ce28 JB |
93 | atomic_t sync_writers; |
94 | ||
d352ac68 CM |
95 | /* full 64 bit generation number, struct vfs_inode doesn't have a big |
96 | * enough field for this. | |
97 | */ | |
e02119d5 CM |
98 | u64 generation; |
99 | ||
15ee9bc7 JB |
100 | /* |
101 | * transid of the trans_handle that last modified this inode | |
102 | */ | |
103 | u64 last_trans; | |
257c62e1 CM |
104 | |
105 | /* | |
bb14a59b | 106 | * transid that last logged this inode |
257c62e1 | 107 | */ |
bb14a59b | 108 | u64 logged_trans; |
257c62e1 | 109 | |
e02119d5 | 110 | /* |
bb14a59b | 111 | * log transid when this inode was last modified |
e02119d5 | 112 | */ |
bb14a59b MX |
113 | int last_sub_trans; |
114 | ||
115 | /* a local copy of root's last_log_commit */ | |
116 | int last_log_commit; | |
49eb7e46 | 117 | |
d352ac68 CM |
118 | /* total number of bytes pending delalloc, used by stat to calc the |
119 | * real block usage of the file | |
120 | */ | |
9069218d | 121 | u64 delalloc_bytes; |
d352ac68 CM |
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 | */ | |
dbe674a9 | 128 | u64 disk_i_size; |
d352ac68 | 129 | |
aec7477b JB |
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; | |
d352ac68 | 135 | |
67de1176 MX |
136 | /* Cache the directory index number to speed the dir/file remove */ |
137 | u64 dir_index; | |
138 | ||
12fcfd22 CM |
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 | ||
7709cde3 JB |
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 | ||
f1bdcc0a JB |
152 | /* flags field from the on disk inode */ |
153 | u32 flags; | |
154 | ||
9ed74f2d | 155 | /* |
32c00aff JB |
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. | |
9ed74f2d | 160 | */ |
9e0baf60 JB |
161 | unsigned outstanding_extents; |
162 | unsigned reserved_extents; | |
9ed74f2d | 163 | |
1e701a32 CM |
164 | /* |
165 | * always compress this one file | |
166 | */ | |
72ac3c0d | 167 | unsigned force_compress; |
1e701a32 | 168 | |
16cdcec7 MX |
169 | struct btrfs_delayed_node *delayed_node; |
170 | ||
d352ac68 | 171 | struct inode vfs_inode; |
2c90e5d6 | 172 | }; |
dbe674a9 | 173 | |
16cdcec7 MX |
174 | extern unsigned char btrfs_filetype_table[]; |
175 | ||
2c90e5d6 CM |
176 | static inline struct btrfs_inode *BTRFS_I(struct inode *inode) |
177 | { | |
178 | return container_of(inode, struct btrfs_inode, vfs_inode); | |
179 | } | |
180 | ||
778ba82b FDBM |
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 | ||
33345d01 LZ |
200 | static inline u64 btrfs_ino(struct inode *inode) |
201 | { | |
202 | u64 ino = BTRFS_I(inode)->location.objectid; | |
203 | ||
14c7cca7 LB |
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) | |
33345d01 LZ |
209 | ino = inode->i_ino; |
210 | return ino; | |
211 | } | |
212 | ||
dbe674a9 CM |
213 | static inline void btrfs_i_size_write(struct inode *inode, u64 size) |
214 | { | |
c2167754 | 215 | i_size_write(inode, size); |
dbe674a9 CM |
216 | BTRFS_I(inode)->disk_i_size = size; |
217 | } | |
218 | ||
83eea1f1 | 219 | static inline bool btrfs_is_free_space_inode(struct inode *inode) |
2cf8572d | 220 | { |
83eea1f1 LB |
221 | struct btrfs_root *root = BTRFS_I(inode)->root; |
222 | ||
51a8cf9d LB |
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) | |
2cf8572d CM |
227 | return true; |
228 | return false; | |
229 | } | |
230 | ||
22ee6985 JB |
231 | static inline int btrfs_inode_in_log(struct inode *inode, u64 generation) |
232 | { | |
22ee6985 | 233 | if (BTRFS_I(inode)->logged_trans == generation && |
a5874ce6 JB |
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) | |
46d8bc34 LB |
238 | return 1; |
239 | return 0; | |
22ee6985 JB |
240 | } |
241 | ||
facc8a22 MX |
242 | struct btrfs_dio_private { |
243 | struct inode *inode; | |
244 | u64 logical_offset; | |
245 | u64 disk_bytenr; | |
246 | u64 bytes; | |
247 | void *private; | |
248 | ||
249 | /* number of bios pending for this dio */ | |
250 | atomic_t pending_bios; | |
251 | ||
252 | /* IO errors */ | |
253 | int errors; | |
254 | ||
255 | /* orig_bio is our btrfs_io_bio */ | |
256 | struct bio *orig_bio; | |
257 | ||
258 | /* dio_bio came from fs/direct-io.c */ | |
259 | struct bio *dio_bio; | |
260 | u8 csum[0]; | |
261 | }; | |
262 | ||
2e60a51e MX |
263 | /* |
264 | * Disable DIO read nolock optimization, so new dio readers will be forced | |
265 | * to grab i_mutex. It is used to avoid the endless truncate due to | |
266 | * nonlocked dio read. | |
267 | */ | |
268 | static inline void btrfs_inode_block_unlocked_dio(struct inode *inode) | |
269 | { | |
270 | set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags); | |
271 | smp_mb(); | |
272 | } | |
273 | ||
274 | static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode) | |
275 | { | |
4e857c58 | 276 | smp_mb__before_atomic(); |
2e60a51e MX |
277 | clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
278 | &BTRFS_I(inode)->runtime_flags); | |
279 | } | |
280 | ||
fc4adbff AG |
281 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end); |
282 | ||
2c90e5d6 | 283 | #endif |