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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/include/linux/ext3_jbd.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 * Ext3-specific journaling extensions.
13 */
14
15#ifndef _LINUX_EXT3_JBD_H
16#define _LINUX_EXT3_JBD_H
17
18#include <linux/fs.h>
19#include <linux/jbd.h>
20#include <linux/ext3_fs.h>
21
22#define EXT3_JOURNAL(inode) (EXT3_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#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
32
33/* Extended attribute operations touch at most two data buffers,
34 * two bitmap buffers, and two group summaries, in addition to the inode
35 * and the superblock, which are already accounted for. */
36
37#define EXT3_XATTR_TRANS_BLOCKS 6U
38
39/* Define the minimum size for a transaction which modifies data. This
40 * needs to take into account the fact that we may end up modifying two
41 * quota files too (one for the group, one for the user quota). The
42 * superblock only gets updated once, of course, so don't bother
43 * counting that again for the quota updates. */
44
Jan Kara1f545872005-06-23 22:01:04 -070045#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 EXT3_XATTR_TRANS_BLOCKS - 2 + \
Jan Kara1f545872005-06-23 22:01:04 -070047 2*EXT3_QUOTA_TRANS_BLOCKS(sb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49/* Delete operations potentially hit one directory's namespace plus an
50 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
51 * generous. We can grow the delete transaction later if necessary. */
52
Jan Kara1f545872005-06-23 22:01:04 -070053#define EXT3_DELETE_TRANS_BLOCKS(sb) (2 * EXT3_DATA_TRANS_BLOCKS(sb) + 64)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/* Define an arbitrary limit for the amount of data we will anticipate
56 * writing to any given transaction. For unbounded transactions such as
57 * write(2) and truncate(2) we can write more than this, but we always
58 * start off at the maximum transaction size and grow the transaction
59 * optimistically as we go. */
60
61#define EXT3_MAX_TRANS_DATA 64U
62
63/* We break up a large truncate or write transaction once the handle's
64 * buffer credits gets this low, we need either to extend the
65 * transaction or to start a new one. Reserve enough space here for
66 * inode, bitmap, superblock, group and indirection updates for at least
67 * one block, plus two quota updates. Quota allocations are not
68 * needed. */
69
70#define EXT3_RESERVE_TRANS_BLOCKS 12U
71
72#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
73
74#ifdef CONFIG_QUOTA
75/* Amount of blocks needed for quota update - we know that the structure was
76 * allocated so we need to update only inode+data */
Jan Kara1f545872005-06-23 22:01:04 -070077#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/* Amount of blocks needed for quota insert/delete - we do some block writes
79 * but inode, sb and group updates are done only once */
Jan Kara1f545872005-06-23 22:01:04 -070080#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
81 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
82#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
83 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#else
Jan Kara1f545872005-06-23 22:01:04 -070085#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
86#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
87#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#endif
89
90int
91ext3_mark_iloc_dirty(handle_t *handle,
92 struct inode *inode,
93 struct ext3_iloc *iloc);
94
95/*
96 * On success, We end up with an outstanding reference count against
97 * iloc->bh. This _must_ be cleaned up later.
98 */
99
100int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
101 struct ext3_iloc *iloc);
102
103int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
104
105/*
106 * Wrapper functions with which ext3 calls into JBD. The intent here is
107 * to allow these to be turned into appropriate stubs so ext3 can control
108 * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
109 * been done yet.
110 */
111
112void ext3_journal_abort_handle(const char *caller, const char *err_fn,
113 struct buffer_head *bh, handle_t *handle, int err);
114
115static inline int
116__ext3_journal_get_undo_access(const char *where, handle_t *handle,
117 struct buffer_head *bh)
118{
119 int err = journal_get_undo_access(handle, bh);
120 if (err)
121 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
122 return err;
123}
124
125static inline int
126__ext3_journal_get_write_access(const char *where, handle_t *handle,
127 struct buffer_head *bh)
128{
129 int err = journal_get_write_access(handle, bh);
130 if (err)
131 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
132 return err;
133}
134
135static inline void
136ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
137{
138 journal_release_buffer(handle, bh);
139}
140
141static inline int
142__ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
143{
144 int err = journal_forget(handle, bh);
145 if (err)
146 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
147 return err;
148}
149
150static inline int
151__ext3_journal_revoke(const char *where, handle_t *handle,
152 unsigned long blocknr, struct buffer_head *bh)
153{
154 int err = journal_revoke(handle, blocknr, bh);
155 if (err)
156 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
157 return err;
158}
159
160static inline int
161__ext3_journal_get_create_access(const char *where,
162 handle_t *handle, struct buffer_head *bh)
163{
164 int err = journal_get_create_access(handle, bh);
165 if (err)
166 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
167 return err;
168}
169
170static inline int
171__ext3_journal_dirty_metadata(const char *where,
172 handle_t *handle, struct buffer_head *bh)
173{
174 int err = journal_dirty_metadata(handle, bh);
175 if (err)
176 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
177 return err;
178}
179
180
181#define ext3_journal_get_undo_access(handle, bh) \
182 __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh))
183#define ext3_journal_get_write_access(handle, bh) \
184 __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))
185#define ext3_journal_revoke(handle, blocknr, bh) \
186 __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
187#define ext3_journal_get_create_access(handle, bh) \
188 __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
189#define ext3_journal_dirty_metadata(handle, bh) \
190 __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
191#define ext3_journal_forget(handle, bh) \
192 __ext3_journal_forget(__FUNCTION__, (handle), (bh))
193
194int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
195
196handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
197int __ext3_journal_stop(const char *where, handle_t *handle);
198
199static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
200{
201 return ext3_journal_start_sb(inode->i_sb, nblocks);
202}
203
204#define ext3_journal_stop(handle) \
205 __ext3_journal_stop(__FUNCTION__, (handle))
206
207static inline handle_t *ext3_journal_current_handle(void)
208{
209 return journal_current_handle();
210}
211
212static inline int ext3_journal_extend(handle_t *handle, int nblocks)
213{
214 return journal_extend(handle, nblocks);
215}
216
217static inline int ext3_journal_restart(handle_t *handle, int nblocks)
218{
219 return journal_restart(handle, nblocks);
220}
221
222static inline int ext3_journal_blocks_per_page(struct inode *inode)
223{
224 return journal_blocks_per_page(inode);
225}
226
227static inline int ext3_journal_force_commit(journal_t *journal)
228{
229 return journal_force_commit(journal);
230}
231
232/* super.c */
233int ext3_force_commit(struct super_block *sb);
234
235static inline int ext3_should_journal_data(struct inode *inode)
236{
237 if (!S_ISREG(inode->i_mode))
238 return 1;
239 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
240 return 1;
241 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
242 return 1;
243 return 0;
244}
245
246static inline int ext3_should_order_data(struct inode *inode)
247{
248 if (!S_ISREG(inode->i_mode))
249 return 0;
250 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
251 return 0;
252 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
253 return 1;
254 return 0;
255}
256
257static inline int ext3_should_writeback_data(struct inode *inode)
258{
259 if (!S_ISREG(inode->i_mode))
260 return 0;
261 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
262 return 0;
263 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
264 return 1;
265 return 0;
266}
267
268#endif /* _LINUX_EXT3_JBD_H */