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 2*EXT3_QUOTA_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) (2 * EXT3_DATA_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
90 int
91 ext3_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
100 int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
101 struct ext3_iloc *iloc);
102
103 int 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
112 static inline void ext3_journal_release_buffer(handle_t *handle,
113 struct buffer_head *bh)
114 {
115 journal_release_buffer(handle, bh);
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err);
120
121 int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
122 struct buffer_head *bh);
123
124 int __ext3_journal_get_write_access(const char *where, handle_t *handle,
125 struct buffer_head *bh);
126
127 int __ext3_journal_forget(const char *where, handle_t *handle,
128 struct buffer_head *bh);
129
130 int __ext3_journal_revoke(const char *where, handle_t *handle,
131 unsigned long blocknr, struct buffer_head *bh);
132
133 int __ext3_journal_get_create_access(const char *where,
134 handle_t *handle, struct buffer_head *bh);
135
136 int __ext3_journal_dirty_metadata(const char *where,
137 handle_t *handle, struct buffer_head *bh);
138
139 #define ext3_journal_get_undo_access(handle, bh) \
140 __ext3_journal_get_undo_access(__func__, (handle), (bh))
141 #define ext3_journal_get_write_access(handle, bh) \
142 __ext3_journal_get_write_access(__func__, (handle), (bh))
143 #define ext3_journal_revoke(handle, blocknr, bh) \
144 __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
145 #define ext3_journal_get_create_access(handle, bh) \
146 __ext3_journal_get_create_access(__func__, (handle), (bh))
147 #define ext3_journal_dirty_metadata(handle, bh) \
148 __ext3_journal_dirty_metadata(__func__, (handle), (bh))
149 #define ext3_journal_forget(handle, bh) \
150 __ext3_journal_forget(__func__, (handle), (bh))
151
152 int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
153
154 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
155 int __ext3_journal_stop(const char *where, handle_t *handle);
156
157 static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
158 {
159 return ext3_journal_start_sb(inode->i_sb, nblocks);
160 }
161
162 #define ext3_journal_stop(handle) \
163 __ext3_journal_stop(__func__, (handle))
164
165 static inline handle_t *ext3_journal_current_handle(void)
166 {
167 return journal_current_handle();
168 }
169
170 static inline int ext3_journal_extend(handle_t *handle, int nblocks)
171 {
172 return journal_extend(handle, nblocks);
173 }
174
175 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
176 {
177 return journal_restart(handle, nblocks);
178 }
179
180 static inline int ext3_journal_blocks_per_page(struct inode *inode)
181 {
182 return journal_blocks_per_page(inode);
183 }
184
185 static inline int ext3_journal_force_commit(journal_t *journal)
186 {
187 return journal_force_commit(journal);
188 }
189
190 /* super.c */
191 int ext3_force_commit(struct super_block *sb);
192
193 static inline int ext3_should_journal_data(struct inode *inode)
194 {
195 if (!S_ISREG(inode->i_mode))
196 return 1;
197 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
198 return 1;
199 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
200 return 1;
201 return 0;
202 }
203
204 static inline int ext3_should_order_data(struct inode *inode)
205 {
206 if (!S_ISREG(inode->i_mode))
207 return 0;
208 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
209 return 0;
210 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
211 return 1;
212 return 0;
213 }
214
215 static inline int ext3_should_writeback_data(struct inode *inode)
216 {
217 if (!S_ISREG(inode->i_mode))
218 return 0;
219 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
220 return 0;
221 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
222 return 1;
223 return 0;
224 }
225
226 #endif /* _LINUX_EXT3_JBD_H */
227
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