1 /*
2 * linux/include/linux/ext4_jbd2.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 * Ext4-specific journaling extensions.
13 */
14
15 #ifndef _LINUX_EXT4_JBD2_H
16 #define _LINUX_EXT4_JBD2_H
17
18 #include <linux/fs.h>
19 #include <linux/jbd2.h>
20 #include <linux/ext4_fs.h>
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
29 * block to complete the transaction.
30 *
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. */
33
34 #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
35 (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
36 || test_opt(sb, EXTENTS) ? 27U : 8U)
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
50 #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
51 EXT4_XATTR_TRANS_BLOCKS - 2 + \
52 2*EXT4_QUOTA_TRANS_BLOCKS(sb))
53
54 /* Delete operations potentially hit one directory's namespace plus an
55 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
56 * generous. We can grow the delete transaction later if necessary. */
57
58 #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)
59
60 /* Define an arbitrary limit for the amount of data we will anticipate
61 * writing to any given transaction. For unbounded transactions such as
62 * write(2) and truncate(2) we can write more than this, but we always
63 * start off at the maximum transaction size and grow the transaction
64 * optimistically as we go. */
65
66 #define EXT4_MAX_TRANS_DATA 64U
67
68 /* We break up a large truncate or write transaction once the handle's
69 * buffer credits gets this low, we need either to extend the
70 * transaction or to start a new one. Reserve enough space here for
71 * inode, bitmap, superblock, group and indirection updates for at least
72 * one block, plus two quota updates. Quota allocations are not
73 * needed. */
74
75 #define EXT4_RESERVE_TRANS_BLOCKS 12U
76
77 #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
78
79 #ifdef CONFIG_QUOTA
80 /* Amount of blocks needed for quota update - we know that the structure was
81 * allocated so we need to update only inode+data */
82 #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
83 /* Amount of blocks needed for quota insert/delete - we do some block writes
84 * but inode, sb and group updates are done only once */
85 #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
86 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)
87 #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
88 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
89 #else
90 #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
91 #define EXT4_QUOTA_INIT_BLOCKS(sb) 0
92 #define EXT4_QUOTA_DEL_BLOCKS(sb) 0
93 #endif
94
95 int
96 ext4_mark_iloc_dirty(handle_t *handle,
97 struct inode *inode,
98 struct ext4_iloc *iloc);
99
100 /*
101 * On success, We end up with an outstanding reference count against
102 * iloc->bh. This _must_ be cleaned up later.
103 */
104
105 int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
106 struct ext4_iloc *iloc);
107
108 int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
109
110 /*
111 * Wrapper functions with which ext4 calls into JBD. The intent here is
112 * to allow these to be turned into appropriate stubs so ext4 can control
113 * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
114 * been done yet.
115 */
116
117 static inline void ext4_journal_release_buffer(handle_t *handle,
118 struct buffer_head *bh)
119 {
120 jbd2_journal_release_buffer(handle, bh);
121 }
122
123 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err);
125
126 int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
127 struct buffer_head *bh);
128
129 int __ext4_journal_get_write_access(const char *where, handle_t *handle,
130 struct buffer_head *bh);
131
132 int __ext4_journal_forget(const char *where, handle_t *handle,
133 struct buffer_head *bh);
134
135 int __ext4_journal_revoke(const char *where, handle_t *handle,
136 ext4_fsblk_t blocknr, struct buffer_head *bh);
137
138 int __ext4_journal_get_create_access(const char *where,
139 handle_t *handle, struct buffer_head *bh);
140
141 int __ext4_journal_dirty_metadata(const char *where,
142 handle_t *handle, struct buffer_head *bh);
143
144 #define ext4_journal_get_undo_access(handle, bh) \
145 __ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
146 #define ext4_journal_get_write_access(handle, bh) \
147 __ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
148 #define ext4_journal_revoke(handle, blocknr, bh) \
149 __ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
150 #define ext4_journal_get_create_access(handle, bh) \
151 __ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
152 #define ext4_journal_dirty_metadata(handle, bh) \
153 __ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
154 #define ext4_journal_forget(handle, bh) \
155 __ext4_journal_forget(__FUNCTION__, (handle), (bh))
156
157 int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
158
159 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
160 int __ext4_journal_stop(const char *where, handle_t *handle);
161
162 static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
163 {
164 return ext4_journal_start_sb(inode->i_sb, nblocks);
165 }
166
167 #define ext4_journal_stop(handle) \
168 __ext4_journal_stop(__FUNCTION__, (handle))
169
170 static inline handle_t *ext4_journal_current_handle(void)
171 {
172 return journal_current_handle();
173 }
174
175 static inline int ext4_journal_extend(handle_t *handle, int nblocks)
176 {
177 return jbd2_journal_extend(handle, nblocks);
178 }
179
180 static inline int ext4_journal_restart(handle_t *handle, int nblocks)
181 {
182 return jbd2_journal_restart(handle, nblocks);
183 }
184
185 static inline int ext4_journal_blocks_per_page(struct inode *inode)
186 {
187 return jbd2_journal_blocks_per_page(inode);
188 }
189
190 static inline int ext4_journal_force_commit(journal_t *journal)
191 {
192 return jbd2_journal_force_commit(journal);
193 }
194
195 /* super.c */
196 int ext4_force_commit(struct super_block *sb);
197
198 static inline int ext4_should_journal_data(struct inode *inode)
199 {
200 if (!S_ISREG(inode->i_mode))
201 return 1;
202 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
203 return 1;
204 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
205 return 1;
206 return 0;
207 }
208
209 static inline int ext4_should_order_data(struct inode *inode)
210 {
211 if (!S_ISREG(inode->i_mode))
212 return 0;
213 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
214 return 0;
215 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
216 return 1;
217 return 0;
218 }
219
220 static inline int ext4_should_writeback_data(struct inode *inode)
221 {
222 if (!S_ISREG(inode->i_mode))
223 return 0;
224 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
225 return 0;
226 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
227 return 1;
228 return 0;
229 }
230
231 #endif /* _LINUX_EXT4_JBD2_H */
232
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