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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 | 51 | EXT4_XATTR_TRANS_BLOCKS - 2 + \ |
5aca07eb | 52 | EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) |
470decc6 | 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 + \ | |
5aca07eb | 60 | EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) |
a02908f1 | 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 | |
21f97697 JK |
89 | * allocated so we need to update only data block */ |
90 | #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 1 : 0) | |
470decc6 DK |
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) |
5aca07eb | 95 | |
470decc6 | 96 | #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ |
a86c6181 | 97 | (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) |
470decc6 DK |
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 | |
5aca07eb DM |
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)) | |
470decc6 DK |
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 | /* | |
e4684b3f | 123 | * Wrapper functions with which ext4 calls into JBD. |
470decc6 | 124 | */ |
90c7201b TT |
125 | void ext4_journal_abort_handle(const char *caller, unsigned int line, |
126 | const char *err_fn, | |
8984d137 | 127 | struct buffer_head *bh, handle_t *handle, int err); |
470decc6 | 128 | |
90c7201b TT |
129 | int __ext4_journal_get_write_access(const char *where, unsigned int line, |
130 | handle_t *handle, struct buffer_head *bh); | |
470decc6 | 131 | |
90c7201b TT |
132 | int __ext4_forget(const char *where, unsigned int line, handle_t *handle, |
133 | int is_metadata, struct inode *inode, | |
134 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
d6797d14 | 135 | |
90c7201b | 136 | int __ext4_journal_get_create_access(const char *where, unsigned int line, |
8984d137 | 137 | handle_t *handle, struct buffer_head *bh); |
470decc6 | 138 | |
90c7201b TT |
139 | int __ext4_handle_dirty_metadata(const char *where, unsigned int line, |
140 | handle_t *handle, struct inode *inode, | |
141 | struct buffer_head *bh); | |
470decc6 | 142 | |
90c7201b TT |
143 | int __ext4_handle_dirty_super(const char *where, unsigned int line, |
144 | handle_t *handle, struct super_block *sb); | |
a0375156 | 145 | |
470decc6 | 146 | #define ext4_journal_get_write_access(handle, bh) \ |
90c7201b | 147 | __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh)) |
d6797d14 | 148 | #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \ |
90c7201b TT |
149 | __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \ |
150 | (bh), (block_nr)) | |
470decc6 | 151 | #define ext4_journal_get_create_access(handle, bh) \ |
90c7201b | 152 | __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh)) |
0390131b | 153 | #define ext4_handle_dirty_metadata(handle, inode, bh) \ |
90c7201b TT |
154 | __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \ |
155 | (bh)) | |
a0375156 | 156 | #define ext4_handle_dirty_super(handle, sb) \ |
90c7201b | 157 | __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb)) |
470decc6 | 158 | |
470decc6 | 159 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); |
c398eda0 | 160 | int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle); |
470decc6 | 161 | |
d3d1faf6 | 162 | #define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096) |
0390131b | 163 | |
d3d1faf6 CW |
164 | /* Note: Do not use this for NULL handles. This is only to determine if |
165 | * a properly allocated handle is using a journal or not. */ | |
0390131b FM |
166 | static inline int ext4_handle_valid(handle_t *handle) |
167 | { | |
d3d1faf6 | 168 | if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT) |
0390131b FM |
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 | ||
470decc6 DK |
200 | static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) |
201 | { | |
202 | return ext4_journal_start_sb(inode->i_sb, nblocks); | |
203 | } | |
204 | ||
205 | #define ext4_journal_stop(handle) \ | |
c398eda0 | 206 | __ext4_journal_stop(__func__, __LINE__, (handle)) |
470decc6 DK |
207 | |
208 | static inline handle_t *ext4_journal_current_handle(void) | |
209 | { | |
210 | return journal_current_handle(); | |
211 | } | |
212 | ||
213 | static inline int ext4_journal_extend(handle_t *handle, int nblocks) | |
214 | { | |
0390131b FM |
215 | if (ext4_handle_valid(handle)) |
216 | return jbd2_journal_extend(handle, nblocks); | |
217 | return 0; | |
470decc6 DK |
218 | } |
219 | ||
220 | static inline int ext4_journal_restart(handle_t *handle, int nblocks) | |
221 | { | |
0390131b FM |
222 | if (ext4_handle_valid(handle)) |
223 | return jbd2_journal_restart(handle, nblocks); | |
224 | return 0; | |
470decc6 DK |
225 | } |
226 | ||
227 | static inline int ext4_journal_blocks_per_page(struct inode *inode) | |
228 | { | |
0390131b FM |
229 | if (EXT4_JOURNAL(inode) != NULL) |
230 | return jbd2_journal_blocks_per_page(inode); | |
231 | return 0; | |
470decc6 DK |
232 | } |
233 | ||
234 | static inline int ext4_journal_force_commit(journal_t *journal) | |
235 | { | |
0390131b FM |
236 | if (journal) |
237 | return jbd2_journal_force_commit(journal); | |
238 | return 0; | |
470decc6 DK |
239 | } |
240 | ||
678aaf48 JK |
241 | static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) |
242 | { | |
0390131b | 243 | if (ext4_handle_valid(handle)) |
8aefcd55 | 244 | return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode); |
0390131b | 245 | return 0; |
678aaf48 JK |
246 | } |
247 | ||
b436b9be JK |
248 | static inline void ext4_update_inode_fsync_trans(handle_t *handle, |
249 | struct inode *inode, | |
250 | int datasync) | |
251 | { | |
252 | struct ext4_inode_info *ei = EXT4_I(inode); | |
253 | ||
254 | if (ext4_handle_valid(handle)) { | |
255 | ei->i_sync_tid = handle->h_transaction->t_tid; | |
256 | if (datasync) | |
257 | ei->i_datasync_tid = handle->h_transaction->t_tid; | |
258 | } | |
259 | } | |
260 | ||
470decc6 DK |
261 | /* super.c */ |
262 | int ext4_force_commit(struct super_block *sb); | |
263 | ||
3d2b1582 LC |
264 | /* |
265 | * Ext4 inode journal modes | |
266 | */ | |
267 | #define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */ | |
268 | #define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */ | |
269 | #define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */ | |
270 | ||
271 | static inline int ext4_inode_journal_mode(struct inode *inode) | |
470decc6 | 272 | { |
0390131b | 273 | if (EXT4_JOURNAL(inode) == NULL) |
3d2b1582 LC |
274 | return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ |
275 | /* We do not support data journalling with delayed allocation */ | |
276 | if (!S_ISREG(inode->i_mode) || | |
277 | test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
278 | return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ | |
279 | if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) && | |
280 | !test_opt(inode->i_sb, DELALLOC)) | |
281 | return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ | |
282 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
283 | return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */ | |
284 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) | |
285 | return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ | |
286 | else | |
287 | BUG(); | |
288 | } | |
289 | ||
290 | static inline int ext4_should_journal_data(struct inode *inode) | |
291 | { | |
292 | return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE; | |
470decc6 DK |
293 | } |
294 | ||
295 | static inline int ext4_should_order_data(struct inode *inode) | |
296 | { | |
3d2b1582 | 297 | return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE; |
470decc6 DK |
298 | } |
299 | ||
300 | static inline int ext4_should_writeback_data(struct inode *inode) | |
301 | { | |
3d2b1582 | 302 | return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE; |
470decc6 DK |
303 | } |
304 | ||
744692dc JZ |
305 | /* |
306 | * This function controls whether or not we should try to go down the | |
307 | * dioread_nolock code paths, which makes it safe to avoid taking | |
308 | * i_mutex for direct I/O reads. This only works for extent-based | |
206f7ab4 CH |
309 | * files, and it doesn't work if data journaling is enabled, since the |
310 | * dioread_nolock code uses b_private to pass information back to the | |
311 | * I/O completion handler, and this conflicts with the jbd's use of | |
312 | * b_private. | |
744692dc JZ |
313 | */ |
314 | static inline int ext4_should_dioread_nolock(struct inode *inode) | |
315 | { | |
316 | if (!test_opt(inode->i_sb, DIOREAD_NOLOCK)) | |
317 | return 0; | |
744692dc JZ |
318 | if (!S_ISREG(inode->i_mode)) |
319 | return 0; | |
12e9b892 | 320 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
744692dc JZ |
321 | return 0; |
322 | if (ext4_should_journal_data(inode)) | |
323 | return 0; | |
324 | return 1; | |
325 | } | |
326 | ||
3dcf5451 | 327 | #endif /* _EXT4_JBD2_H */ |