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1/*
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
45#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \
46 EXT3_XATTR_TRANS_BLOCKS - 2 + \
47 EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
48
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
53#define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
54
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 */
77#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
78/* Amount of blocks needed for quota insert/delete - we do some block writes
79 * but inode, sb and group updates are done only once */
80#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)
84#else
85#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
86#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
87#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
88#endif
89#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
90#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
91#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
92
93int
94ext3_mark_iloc_dirty(handle_t *handle,
95 struct inode *inode,
96 struct ext3_iloc *iloc);
97
98/*
99 * On success, We end up with an outstanding reference count against
100 * iloc->bh. This _must_ be cleaned up later.
101 */
102
103int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
104 struct ext3_iloc *iloc);
105
106int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
107
108/*
109 * Wrapper functions with which ext3 calls into JBD. The intent here is
110 * to allow these to be turned into appropriate stubs so ext3 can control
111 * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
112 * been done yet.
113 */
114
115static inline void ext3_journal_release_buffer(handle_t *handle,
116 struct buffer_head *bh)
117{
118 journal_release_buffer(handle, bh);
119}
120
121void ext3_journal_abort_handle(const char *caller, const char *err_fn,
122 struct buffer_head *bh, handle_t *handle, int err);
123
124int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
125 struct buffer_head *bh);
126
127int __ext3_journal_get_write_access(const char *where, handle_t *handle,
128 struct buffer_head *bh);
129
130int __ext3_journal_forget(const char *where, handle_t *handle,
131 struct buffer_head *bh);
132
133int __ext3_journal_revoke(const char *where, handle_t *handle,
134 unsigned long blocknr, struct buffer_head *bh);
135
136int __ext3_journal_get_create_access(const char *where,
137 handle_t *handle, struct buffer_head *bh);
138
139int __ext3_journal_dirty_metadata(const char *where,
140 handle_t *handle, struct buffer_head *bh);
141
142#define ext3_journal_get_undo_access(handle, bh) \
143 __ext3_journal_get_undo_access(__func__, (handle), (bh))
144#define ext3_journal_get_write_access(handle, bh) \
145 __ext3_journal_get_write_access(__func__, (handle), (bh))
146#define ext3_journal_revoke(handle, blocknr, bh) \
147 __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
148#define ext3_journal_get_create_access(handle, bh) \
149 __ext3_journal_get_create_access(__func__, (handle), (bh))
150#define ext3_journal_dirty_metadata(handle, bh) \
151 __ext3_journal_dirty_metadata(__func__, (handle), (bh))
152#define ext3_journal_forget(handle, bh) \
153 __ext3_journal_forget(__func__, (handle), (bh))
154
155int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
156
157handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
158int __ext3_journal_stop(const char *where, handle_t *handle);
159
160static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
161{
162 return ext3_journal_start_sb(inode->i_sb, nblocks);
163}
164
165#define ext3_journal_stop(handle) \
166 __ext3_journal_stop(__func__, (handle))
167
168static inline handle_t *ext3_journal_current_handle(void)
169{
170 return journal_current_handle();
171}
172
173static inline int ext3_journal_extend(handle_t *handle, int nblocks)
174{
175 return journal_extend(handle, nblocks);
176}
177
178static inline int ext3_journal_restart(handle_t *handle, int nblocks)
179{
180 return journal_restart(handle, nblocks);
181}
182
183static inline int ext3_journal_blocks_per_page(struct inode *inode)
184{
185 return journal_blocks_per_page(inode);
186}
187
188static inline int ext3_journal_force_commit(journal_t *journal)
189{
190 return journal_force_commit(journal);
191}
192
193/* super.c */
194int ext3_force_commit(struct super_block *sb);
195
196static inline int ext3_should_journal_data(struct inode *inode)
197{
198 if (!S_ISREG(inode->i_mode))
199 return 1;
200 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
201 return 1;
202 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
203 return 1;
204 return 0;
205}
206
207static inline int ext3_should_order_data(struct inode *inode)
208{
209 if (!S_ISREG(inode->i_mode))
210 return 0;
211 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
212 return 0;
213 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
214 return 1;
215 return 0;
216}
217
218static inline int ext3_should_writeback_data(struct inode *inode)
219{
220 if (!S_ISREG(inode->i_mode))
221 return 0;
222 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
223 return 0;
224 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
225 return 1;
226 return 0;
227}
228
229#endif /* _LINUX_EXT3_JBD_H */