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1 | /* | |
2 | * ext4_jbd2.h | |
3 | * | |
4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 | |
5 | * | |
6 | * Copyright 1998--1999 Red Hat corp --- All Rights Reserved | |
7 | * | |
8 | * This file is part of the Linux kernel and is made available under | |
9 | * the terms of the GNU General Public License, version 2, or at your | |
10 | * option, any later version, incorporated herein by reference. | |
11 | * | |
12 | * Ext4-specific journaling extensions. | |
13 | */ | |
14 | ||
15 | #ifndef _EXT4_JBD2_H | |
16 | #define _EXT4_JBD2_H | |
17 | ||
18 | #include <linux/fs.h> | |
19 | #include <linux/jbd2.h> | |
20 | #include "ext4.h" | |
21 | ||
22 | #define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal) | |
23 | ||
24 | /* Define the number of blocks we need to account to a transaction to | |
25 | * modify one block of data. | |
26 | * | |
27 | * We may have to touch one inode, one bitmap buffer, up to three | |
28 | * indirection blocks, the group and superblock summaries, and the data | |
29 | * block to complete the transaction. | |
30 | * | |
31 | * For extents-enabled fs we may have to allocate and modify up to | |
32 | * 5 levels of tree + root which are stored in the inode. */ | |
33 | ||
34 | #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \ | |
35 | (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \ | |
36 | ? 27U : 8U) | |
37 | ||
38 | /* Extended attribute operations touch at most two data buffers, | |
39 | * two bitmap buffers, and two group summaries, in addition to the inode | |
40 | * and the superblock, which are already accounted for. */ | |
41 | ||
42 | #define EXT4_XATTR_TRANS_BLOCKS 6U | |
43 | ||
44 | /* Define the minimum size for a transaction which modifies data. This | |
45 | * needs to take into account the fact that we may end up modifying two | |
46 | * quota files too (one for the group, one for the user quota). The | |
47 | * superblock only gets updated once, of course, so don't bother | |
48 | * counting that again for the quota updates. */ | |
49 | ||
50 | #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \ | |
51 | EXT4_XATTR_TRANS_BLOCKS - 2 + \ | |
52 | EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) | |
53 | ||
54 | /* | |
55 | * Define the number of metadata blocks we need to account to modify data. | |
56 | * | |
57 | * This include super block, inode block, quota blocks and xattr blocks | |
58 | */ | |
59 | #define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \ | |
60 | EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) | |
61 | ||
62 | /* Delete operations potentially hit one directory's namespace plus an | |
63 | * entire inode, plus arbitrary amounts of bitmap/indirection data. Be | |
64 | * generous. We can grow the delete transaction later if necessary. */ | |
65 | ||
66 | #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) | |
67 | ||
68 | /* Define an arbitrary limit for the amount of data we will anticipate | |
69 | * writing to any given transaction. For unbounded transactions such as | |
70 | * write(2) and truncate(2) we can write more than this, but we always | |
71 | * start off at the maximum transaction size and grow the transaction | |
72 | * optimistically as we go. */ | |
73 | ||
74 | #define EXT4_MAX_TRANS_DATA 64U | |
75 | ||
76 | /* We break up a large truncate or write transaction once the handle's | |
77 | * buffer credits gets this low, we need either to extend the | |
78 | * transaction or to start a new one. Reserve enough space here for | |
79 | * inode, bitmap, superblock, group and indirection updates for at least | |
80 | * one block, plus two quota updates. Quota allocations are not | |
81 | * needed. */ | |
82 | ||
83 | #define EXT4_RESERVE_TRANS_BLOCKS 12U | |
84 | ||
85 | #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 | |
86 | ||
87 | #ifdef CONFIG_QUOTA | |
88 | /* Amount of blocks needed for quota update - we know that the structure was | |
89 | * allocated so we need to update only inode+data */ | |
90 | #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) | |
91 | /* Amount of blocks needed for quota insert/delete - we do some block writes | |
92 | * but inode, sb and group updates are done only once */ | |
93 | #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ | |
94 | (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) | |
95 | ||
96 | #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ | |
97 | (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) | |
98 | #else | |
99 | #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 | |
100 | #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 | |
101 | #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 | |
102 | #endif | |
103 | #define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb)) | |
104 | #define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb)) | |
105 | #define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb)) | |
106 | ||
107 | int | |
108 | ext4_mark_iloc_dirty(handle_t *handle, | |
109 | struct inode *inode, | |
110 | struct ext4_iloc *iloc); | |
111 | ||
112 | /* | |
113 | * On success, We end up with an outstanding reference count against | |
114 | * iloc->bh. This _must_ be cleaned up later. | |
115 | */ | |
116 | ||
117 | int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, | |
118 | struct ext4_iloc *iloc); | |
119 | ||
120 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); | |
121 | ||
122 | /* | |
123 | * Wrapper functions with which ext4 calls into JBD. | |
124 | */ | |
125 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, | |
126 | struct buffer_head *bh, handle_t *handle, int err); | |
127 | ||
128 | int __ext4_journal_get_undo_access(const char *where, handle_t *handle, | |
129 | struct buffer_head *bh); | |
130 | ||
131 | int __ext4_journal_get_write_access(const char *where, handle_t *handle, | |
132 | struct buffer_head *bh); | |
133 | ||
134 | int __ext4_forget(const char *where, handle_t *handle, int is_metadata, | |
135 | struct inode *inode, struct buffer_head *bh, | |
136 | ext4_fsblk_t blocknr); | |
137 | ||
138 | int __ext4_journal_get_create_access(const char *where, | |
139 | handle_t *handle, struct buffer_head *bh); | |
140 | ||
141 | int __ext4_handle_dirty_metadata(const char *where, handle_t *handle, | |
142 | struct inode *inode, struct buffer_head *bh); | |
143 | ||
144 | #define ext4_journal_get_undo_access(handle, bh) \ | |
145 | __ext4_journal_get_undo_access(__func__, (handle), (bh)) | |
146 | #define ext4_journal_get_write_access(handle, bh) \ | |
147 | __ext4_journal_get_write_access(__func__, (handle), (bh)) | |
148 | #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \ | |
149 | __ext4_forget(__func__, (handle), (is_metadata), (inode), (bh),\ | |
150 | (block_nr)) | |
151 | #define ext4_journal_get_create_access(handle, bh) \ | |
152 | __ext4_journal_get_create_access(__func__, (handle), (bh)) | |
153 | #define ext4_handle_dirty_metadata(handle, inode, bh) \ | |
154 | __ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh)) | |
155 | ||
156 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); | |
157 | int __ext4_journal_stop(const char *where, handle_t *handle); | |
158 | ||
159 | #define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096) | |
160 | ||
161 | /* Note: Do not use this for NULL handles. This is only to determine if | |
162 | * a properly allocated handle is using a journal or not. */ | |
163 | static inline int ext4_handle_valid(handle_t *handle) | |
164 | { | |
165 | if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT) | |
166 | return 0; | |
167 | return 1; | |
168 | } | |
169 | ||
170 | static inline void ext4_handle_sync(handle_t *handle) | |
171 | { | |
172 | if (ext4_handle_valid(handle)) | |
173 | handle->h_sync = 1; | |
174 | } | |
175 | ||
176 | static inline void ext4_handle_release_buffer(handle_t *handle, | |
177 | struct buffer_head *bh) | |
178 | { | |
179 | if (ext4_handle_valid(handle)) | |
180 | jbd2_journal_release_buffer(handle, bh); | |
181 | } | |
182 | ||
183 | static inline int ext4_handle_is_aborted(handle_t *handle) | |
184 | { | |
185 | if (ext4_handle_valid(handle)) | |
186 | return is_handle_aborted(handle); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed) | |
191 | { | |
192 | if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed) | |
193 | return 0; | |
194 | return 1; | |
195 | } | |
196 | ||
197 | static inline void ext4_journal_release_buffer(handle_t *handle, | |
198 | struct buffer_head *bh) | |
199 | { | |
200 | if (ext4_handle_valid(handle)) | |
201 | jbd2_journal_release_buffer(handle, bh); | |
202 | } | |
203 | ||
204 | static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) | |
205 | { | |
206 | return ext4_journal_start_sb(inode->i_sb, nblocks); | |
207 | } | |
208 | ||
209 | #define ext4_journal_stop(handle) \ | |
210 | __ext4_journal_stop(__func__, (handle)) | |
211 | ||
212 | static inline handle_t *ext4_journal_current_handle(void) | |
213 | { | |
214 | return journal_current_handle(); | |
215 | } | |
216 | ||
217 | static inline int ext4_journal_extend(handle_t *handle, int nblocks) | |
218 | { | |
219 | if (ext4_handle_valid(handle)) | |
220 | return jbd2_journal_extend(handle, nblocks); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static inline int ext4_journal_restart(handle_t *handle, int nblocks) | |
225 | { | |
226 | if (ext4_handle_valid(handle)) | |
227 | return jbd2_journal_restart(handle, nblocks); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static inline int ext4_journal_blocks_per_page(struct inode *inode) | |
232 | { | |
233 | if (EXT4_JOURNAL(inode) != NULL) | |
234 | return jbd2_journal_blocks_per_page(inode); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static inline int ext4_journal_force_commit(journal_t *journal) | |
239 | { | |
240 | if (journal) | |
241 | return jbd2_journal_force_commit(journal); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) | |
246 | { | |
247 | if (ext4_handle_valid(handle)) | |
248 | return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static inline void ext4_update_inode_fsync_trans(handle_t *handle, | |
253 | struct inode *inode, | |
254 | int datasync) | |
255 | { | |
256 | struct ext4_inode_info *ei = EXT4_I(inode); | |
257 | ||
258 | if (ext4_handle_valid(handle)) { | |
259 | ei->i_sync_tid = handle->h_transaction->t_tid; | |
260 | if (datasync) | |
261 | ei->i_datasync_tid = handle->h_transaction->t_tid; | |
262 | } | |
263 | } | |
264 | ||
265 | /* super.c */ | |
266 | int ext4_force_commit(struct super_block *sb); | |
267 | ||
268 | static inline int ext4_should_journal_data(struct inode *inode) | |
269 | { | |
270 | if (EXT4_JOURNAL(inode) == NULL) | |
271 | return 0; | |
272 | if (!S_ISREG(inode->i_mode)) | |
273 | return 1; | |
274 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
275 | return 1; | |
276 | if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) | |
277 | return 1; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static inline int ext4_should_order_data(struct inode *inode) | |
282 | { | |
283 | if (EXT4_JOURNAL(inode) == NULL) | |
284 | return 0; | |
285 | if (!S_ISREG(inode->i_mode)) | |
286 | return 0; | |
287 | if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) | |
288 | return 0; | |
289 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
290 | return 1; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static inline int ext4_should_writeback_data(struct inode *inode) | |
295 | { | |
296 | if (!S_ISREG(inode->i_mode)) | |
297 | return 0; | |
298 | if (EXT4_JOURNAL(inode) == NULL) | |
299 | return 1; | |
300 | if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) | |
301 | return 0; | |
302 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) | |
303 | return 1; | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /* | |
308 | * This function controls whether or not we should try to go down the | |
309 | * dioread_nolock code paths, which makes it safe to avoid taking | |
310 | * i_mutex for direct I/O reads. This only works for extent-based | |
311 | * files, and it doesn't work for nobh or if data journaling is | |
312 | * enabled, since the dioread_nolock code uses b_private to pass | |
313 | * information back to the I/O completion handler, and this conflicts | |
314 | * with the jbd's use of b_private. | |
315 | */ | |
316 | static inline int ext4_should_dioread_nolock(struct inode *inode) | |
317 | { | |
318 | if (!test_opt(inode->i_sb, DIOREAD_NOLOCK)) | |
319 | return 0; | |
320 | if (test_opt(inode->i_sb, NOBH)) | |
321 | return 0; | |
322 | if (!S_ISREG(inode->i_mode)) | |
323 | return 0; | |
324 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
325 | return 0; | |
326 | if (ext4_should_journal_data(inode)) | |
327 | return 0; | |
328 | return 1; | |
329 | } | |
330 | ||
331 | #endif /* _EXT4_JBD2_H */ |