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470decc6 | 1 | /* |
3dcf5451 | 2 | * ext4_jbd2.h |
470decc6 DK |
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 | ||
3dcf5451 CH |
15 | #ifndef _EXT4_JBD2_H |
16 | #define _EXT4_JBD2_H | |
470decc6 DK |
17 | |
18 | #include <linux/fs.h> | |
f7f4bccb | 19 | #include <linux/jbd2.h> |
3dcf5451 | 20 | #include "ext4.h" |
470decc6 DK |
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 | |
a86c6181 AT |
29 | * block to complete the transaction. |
30 | * | |
d0d856e8 RD |
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. */ | |
470decc6 | 33 | |
a86c6181 | 34 | #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \ |
83982b6f TT |
35 | (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \ |
36 | ? 27U : 8U) | |
470decc6 DK |
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 | ||
a86c6181 | 50 | #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \ |
470decc6 DK |
51 | EXT4_XATTR_TRANS_BLOCKS - 2 + \ |
52 | 2*EXT4_QUOTA_TRANS_BLOCKS(sb)) | |
53 | ||
a02908f1 MC |
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 | 2*EXT4_QUOTA_TRANS_BLOCKS(sb)) | |
61 | ||
470decc6 DK |
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*\ | |
a86c6181 | 94 | (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) |
470decc6 | 95 | #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ |
a86c6181 | 96 | (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) |
470decc6 DK |
97 | #else |
98 | #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 | |
99 | #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 | |
100 | #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 | |
101 | #endif | |
102 | ||
103 | int | |
104 | ext4_mark_iloc_dirty(handle_t *handle, | |
105 | struct inode *inode, | |
106 | struct ext4_iloc *iloc); | |
107 | ||
108 | /* | |
109 | * On success, We end up with an outstanding reference count against | |
110 | * iloc->bh. This _must_ be cleaned up later. | |
111 | */ | |
112 | ||
113 | int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, | |
114 | struct ext4_iloc *iloc); | |
115 | ||
116 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); | |
117 | ||
118 | /* | |
119 | * Wrapper functions with which ext4 calls into JBD. The intent here is | |
120 | * to allow these to be turned into appropriate stubs so ext4 can control | |
121 | * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't | |
122 | * been done yet. | |
123 | */ | |
124 | ||
8984d137 AM |
125 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
126 | struct buffer_head *bh, handle_t *handle, int err); | |
470decc6 | 127 | |
8984d137 AM |
128 | int __ext4_journal_get_undo_access(const char *where, handle_t *handle, |
129 | struct buffer_head *bh); | |
470decc6 | 130 | |
8984d137 AM |
131 | int __ext4_journal_get_write_access(const char *where, handle_t *handle, |
132 | struct buffer_head *bh); | |
470decc6 | 133 | |
e6b5d301 | 134 | /* When called with an invalid handle, this will still do a put on the BH */ |
8984d137 AM |
135 | int __ext4_journal_forget(const char *where, handle_t *handle, |
136 | struct buffer_head *bh); | |
470decc6 | 137 | |
e6b5d301 | 138 | /* When called with an invalid handle, this will still do a put on the BH */ |
8984d137 AM |
139 | int __ext4_journal_revoke(const char *where, handle_t *handle, |
140 | ext4_fsblk_t blocknr, struct buffer_head *bh); | |
470decc6 | 141 | |
8984d137 AM |
142 | int __ext4_journal_get_create_access(const char *where, |
143 | handle_t *handle, struct buffer_head *bh); | |
470decc6 | 144 | |
0390131b FM |
145 | int __ext4_handle_dirty_metadata(const char *where, handle_t *handle, |
146 | struct inode *inode, struct buffer_head *bh); | |
470decc6 DK |
147 | |
148 | #define ext4_journal_get_undo_access(handle, bh) \ | |
4db9c54a | 149 | __ext4_journal_get_undo_access(__func__, (handle), (bh)) |
470decc6 | 150 | #define ext4_journal_get_write_access(handle, bh) \ |
4db9c54a | 151 | __ext4_journal_get_write_access(__func__, (handle), (bh)) |
470decc6 | 152 | #define ext4_journal_revoke(handle, blocknr, bh) \ |
4db9c54a | 153 | __ext4_journal_revoke(__func__, (handle), (blocknr), (bh)) |
470decc6 | 154 | #define ext4_journal_get_create_access(handle, bh) \ |
4db9c54a | 155 | __ext4_journal_get_create_access(__func__, (handle), (bh)) |
470decc6 | 156 | #define ext4_journal_forget(handle, bh) \ |
4db9c54a | 157 | __ext4_journal_forget(__func__, (handle), (bh)) |
0390131b FM |
158 | #define ext4_handle_dirty_metadata(handle, inode, bh) \ |
159 | __ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh)) | |
470decc6 | 160 | |
470decc6 DK |
161 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); |
162 | int __ext4_journal_stop(const char *where, handle_t *handle); | |
163 | ||
0390131b FM |
164 | #define EXT4_NOJOURNAL_HANDLE ((handle_t *) 0x1) |
165 | ||
166 | static inline int ext4_handle_valid(handle_t *handle) | |
167 | { | |
168 | if (handle == EXT4_NOJOURNAL_HANDLE) | |
169 | return 0; | |
170 | return 1; | |
171 | } | |
172 | ||
173 | static inline void ext4_handle_sync(handle_t *handle) | |
174 | { | |
175 | if (ext4_handle_valid(handle)) | |
176 | handle->h_sync = 1; | |
177 | } | |
178 | ||
179 | static inline void ext4_handle_release_buffer(handle_t *handle, | |
180 | struct buffer_head *bh) | |
181 | { | |
182 | if (ext4_handle_valid(handle)) | |
183 | jbd2_journal_release_buffer(handle, bh); | |
184 | } | |
185 | ||
186 | static inline int ext4_handle_is_aborted(handle_t *handle) | |
187 | { | |
188 | if (ext4_handle_valid(handle)) | |
189 | return is_handle_aborted(handle); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed) | |
194 | { | |
195 | if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed) | |
196 | return 0; | |
197 | return 1; | |
198 | } | |
199 | ||
200 | static inline void ext4_journal_release_buffer(handle_t *handle, | |
201 | struct buffer_head *bh) | |
202 | { | |
203 | if (ext4_handle_valid(handle)) | |
204 | jbd2_journal_release_buffer(handle, bh); | |
205 | } | |
206 | ||
470decc6 DK |
207 | static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) |
208 | { | |
209 | return ext4_journal_start_sb(inode->i_sb, nblocks); | |
210 | } | |
211 | ||
212 | #define ext4_journal_stop(handle) \ | |
4db9c54a | 213 | __ext4_journal_stop(__func__, (handle)) |
470decc6 DK |
214 | |
215 | static inline handle_t *ext4_journal_current_handle(void) | |
216 | { | |
217 | return journal_current_handle(); | |
218 | } | |
219 | ||
220 | static inline int ext4_journal_extend(handle_t *handle, int nblocks) | |
221 | { | |
0390131b FM |
222 | if (ext4_handle_valid(handle)) |
223 | return jbd2_journal_extend(handle, nblocks); | |
224 | return 0; | |
470decc6 DK |
225 | } |
226 | ||
227 | static inline int ext4_journal_restart(handle_t *handle, int nblocks) | |
228 | { | |
0390131b FM |
229 | if (ext4_handle_valid(handle)) |
230 | return jbd2_journal_restart(handle, nblocks); | |
231 | return 0; | |
470decc6 DK |
232 | } |
233 | ||
234 | static inline int ext4_journal_blocks_per_page(struct inode *inode) | |
235 | { | |
0390131b FM |
236 | if (EXT4_JOURNAL(inode) != NULL) |
237 | return jbd2_journal_blocks_per_page(inode); | |
238 | return 0; | |
470decc6 DK |
239 | } |
240 | ||
241 | static inline int ext4_journal_force_commit(journal_t *journal) | |
242 | { | |
0390131b FM |
243 | if (journal) |
244 | return jbd2_journal_force_commit(journal); | |
245 | return 0; | |
470decc6 DK |
246 | } |
247 | ||
678aaf48 JK |
248 | static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) |
249 | { | |
0390131b FM |
250 | if (ext4_handle_valid(handle)) |
251 | return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); | |
252 | return 0; | |
678aaf48 JK |
253 | } |
254 | ||
470decc6 DK |
255 | /* super.c */ |
256 | int ext4_force_commit(struct super_block *sb); | |
257 | ||
258 | static inline int ext4_should_journal_data(struct inode *inode) | |
259 | { | |
0390131b FM |
260 | if (EXT4_JOURNAL(inode) == NULL) |
261 | return 0; | |
470decc6 DK |
262 | if (!S_ISREG(inode->i_mode)) |
263 | return 1; | |
264 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
265 | return 1; | |
266 | if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) | |
267 | return 1; | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static inline int ext4_should_order_data(struct inode *inode) | |
272 | { | |
0390131b FM |
273 | if (EXT4_JOURNAL(inode) == NULL) |
274 | return 0; | |
470decc6 DK |
275 | if (!S_ISREG(inode->i_mode)) |
276 | return 0; | |
277 | if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) | |
278 | return 0; | |
279 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
280 | return 1; | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static inline int ext4_should_writeback_data(struct inode *inode) | |
285 | { | |
286 | if (!S_ISREG(inode->i_mode)) | |
287 | return 0; | |
5adfee9c TT |
288 | if (EXT4_JOURNAL(inode) == NULL) |
289 | return 1; | |
470decc6 DK |
290 | if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) |
291 | return 0; | |
292 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) | |
293 | return 1; | |
294 | return 0; | |
295 | } | |
296 | ||
3dcf5451 | 297 | #endif /* _EXT4_JBD2_H */ |