ReactOS  0.4.15-dev-341-g17c5fb8
ext3_jbd.h
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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  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
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 
101  struct ext3_iloc *iloc);
102 
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 
113  struct buffer_head *bh)
114 {
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(__FUNCTION__, (handle), (bh))
141 #define ext3_journal_get_write_access(handle, bh) \
142  __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))
143 #define ext3_journal_revoke(handle, blocknr, bh) \
144  __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
145 #define ext3_journal_get_create_access(handle, bh) \
146  __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
147 #define ext3_journal_dirty_metadata(handle, bh) \
148  __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
149 #define ext3_journal_forget(handle, bh) \
150  __ext3_journal_forget(__FUNCTION__, (handle), (bh))
151 
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(__FUNCTION__, (handle))
164 
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 {
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 */
int ext3_force_commit(struct super_block *sb)
int ext3_reserve_inode_write(handle_t *handle, struct inode *inode, struct ext3_iloc *iloc)
#define EXT3_MOUNT_ORDERED_DATA
Definition: ext3_fs.h:438
void journal_release_buffer(handle_t *handle, struct buffer_head *bh)
Definition: replay.c:1425
#define EXT3_JOURNAL_DATA_FL
Definition: ext3_fs.h:222
superblock * sb
Definition: btrfs.c:4220
umode_t i_mode
Definition: fs.h:87
Definition: fs.h:64
handle_t * ext3_journal_start_sb(struct super_block *sb, int nblocks)
Definition: fs.h:78
int __ext3_journal_get_write_access(const char *where, handle_t *handle, struct buffer_head *bh)
int __ext3_journal_get_undo_access(const char *where, handle_t *handle, struct buffer_head *bh)
static void ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
Definition: ext3_jbd.h:112
int journal_blocks_per_page(struct inode *inode)
Definition: replay.c:207
static int ext3_should_journal_data(struct inode *inode)
Definition: ext3_jbd.h:193
int __ext3_journal_get_create_access(const char *where, handle_t *handle, struct buffer_head *bh)
static int ext3_journal_blocks_per_page(struct inode *inode)
Definition: ext3_jbd.h:180
int __ext3_journal_dirty_metadata(const char *where, handle_t *handle, struct buffer_head *bh)
static handle_t * ext3_journal_current_handle(void)
Definition: ext3_jbd.h:165
static int ext3_should_order_data(struct inode *inode)
Definition: ext3_jbd.h:204
int __ext3_journal_stop(const char *where, handle_t *handle)
static handle_t * ext3_journal_start(struct inode *inode, int nblocks)
Definition: ext3_jbd.h:157
int __ext3_journal_revoke(const char *where, handle_t *handle, unsigned long blocknr, struct buffer_head *bh)
int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
static int ext3_should_writeback_data(struct inode *inode)
Definition: ext3_jbd.h:215
void ext3_journal_abort_handle(const char *caller, const char *err_fn, struct buffer_head *bh, handle_t *handle, int err)
#define err(...)
int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode)
#define EXT3_MOUNT_WRITEBACK_DATA
Definition: ext3_fs.h:439
static int ext3_journal_extend(handle_t *handle, int nblocks)
Definition: ext3_jbd.h:170
#define test_opt(sb, opt)
Definition: ext2_fs.h:327
static int ext3_journal_force_commit(journal_t *journal)
Definition: ext3_jbd.h:185
int __ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
struct super_block * i_sb
Definition: fs.h:96
int ext3_mark_iloc_dirty(handle_t *handle, struct inode *inode, struct ext3_iloc *iloc)
#define S_ISREG(mode)
Definition: various.h:17
#define EXT3_MOUNT_JOURNAL_DATA
Definition: ext3_fs.h:437
static int ext3_journal_restart(handle_t *handle, int nblocks)
Definition: ext3_jbd.h:175