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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_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) |
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_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) |
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_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) |
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_I(inode)->i_flags & EXT4_EXTENTS_FL)) |
325 | return 0; |
326 | if (ext4_should_journal_data(inode)) |
327 | return 0; |
328 | return 1; |
329 | } |
330 | |
331 | #endif /* _EXT4_JBD2_H */ |
332 |
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