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1/*
2 * 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 _EXT4_JBD2_H
16#define _EXT4_JBD2_H
17
18#include <linux/fs.h>
19#include <linux/jbd2.h>
20#include "ext4.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
95int
96ext4_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
105int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
106 struct ext4_iloc *iloc);
107
108int 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
117static inline void ext4_journal_release_buffer(handle_t *handle,
118 struct buffer_head *bh)
119{
120 jbd2_journal_release_buffer(handle, bh);
121}
122
123void ext4_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err);
125
126int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
127 struct buffer_head *bh);
128
129int __ext4_journal_get_write_access(const char *where, handle_t *handle,
130 struct buffer_head *bh);
131
132int __ext4_journal_forget(const char *where, handle_t *handle,
133 struct buffer_head *bh);
134
135int __ext4_journal_revoke(const char *where, handle_t *handle,
136 ext4_fsblk_t blocknr, struct buffer_head *bh);
137
138int __ext4_journal_get_create_access(const char *where,
139 handle_t *handle, struct buffer_head *bh);
140
141int __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
157int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
158
159handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
160int __ext4_journal_stop(const char *where, handle_t *handle);
161
162static 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
170static inline handle_t *ext4_journal_current_handle(void)
171{
172 return journal_current_handle();
173}
174
175static inline int ext4_journal_extend(handle_t *handle, int nblocks)
176{
177 return jbd2_journal_extend(handle, nblocks);
178}
179
180static inline int ext4_journal_restart(handle_t *handle, int nblocks)
181{
182 return jbd2_journal_restart(handle, nblocks);
183}
184
185static inline int ext4_journal_blocks_per_page(struct inode *inode)
186{
187 return jbd2_journal_blocks_per_page(inode);
188}
189
190static inline int ext4_journal_force_commit(journal_t *journal)
191{
192 return jbd2_journal_force_commit(journal);
193}
194
195/* super.c */
196int ext4_force_commit(struct super_block *sb);
197
198static 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
209static 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
220static 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 /* _EXT4_JBD2_H */