2 * linux/include/linux/ext3_jbd.h
4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
6 * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
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.
12 * Ext3-specific journaling extensions.
15 #ifndef _LINUX_EXT3_JBD_H
16 #define _LINUX_EXT3_JBD_H
19 #include <linux/jbd.h>
20 #include <linux/ext3_fs.h>
22 #define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
24 /* Define the number of blocks we need to account to a transaction to
25 * modify one block of data.
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. */
31 #define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
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. */
37 #define EXT3_XATTR_TRANS_BLOCKS 6U
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. */
45 #define EXT3_DATA_TRANS_BLOCKS (EXT3_SINGLEDATA_TRANS_BLOCKS + \
46 EXT3_XATTR_TRANS_BLOCKS - 2 + \
47 2*EXT3_QUOTA_TRANS_BLOCKS)
49 extern int ext3_writepage_trans_blocks(struct inode *inode);
51 /* Delete operations potentially hit one directory's namespace plus an
52 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
53 * generous. We can grow the delete transaction later if necessary. */
55 #define EXT3_DELETE_TRANS_BLOCKS (2 * EXT3_DATA_TRANS_BLOCKS + 64)
57 /* Define an arbitrary limit for the amount of data we will anticipate
58 * writing to any given transaction. For unbounded transactions such as
59 * write(2) and truncate(2) we can write more than this, but we always
60 * start off at the maximum transaction size and grow the transaction
61 * optimistically as we go. */
63 #define EXT3_MAX_TRANS_DATA 64U
65 /* We break up a large truncate or write transaction once the handle's
66 * buffer credits gets this low, we need either to extend the
67 * transaction or to start a new one. Reserve enough space here for
68 * inode, bitmap, superblock, group and indirection updates for at least
69 * one block, plus two quota updates. Quota allocations are not
72 #define EXT3_RESERVE_TRANS_BLOCKS 12U
74 #define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
77 /* Amount of blocks needed for quota update - we know that the structure was
78 * allocated so we need to update only inode+data */
79 #define EXT3_QUOTA_TRANS_BLOCKS 2
80 /* Amount of blocks needed for quota insert/delete - we do some block writes
81 * but inode, sb and group updates are done only once */
82 #define EXT3_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*\
83 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3)
85 #define EXT3_QUOTA_TRANS_BLOCKS 0
86 #define EXT3_QUOTA_INIT_BLOCKS 0
90 ext3_mark_iloc_dirty(handle_t *handle,
92 struct ext3_iloc *iloc);
95 * On success, We end up with an outstanding reference count against
96 * iloc->bh. This _must_ be cleaned up later.
99 int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
100 struct ext3_iloc *iloc);
102 int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
105 * Wrapper functions with which ext3 calls into JBD. The intent here is
106 * to allow these to be turned into appropriate stubs so ext3 can control
107 * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
111 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
112 struct buffer_head *bh, handle_t *handle, int err);
115 __ext3_journal_get_undo_access(const char *where, handle_t *handle,
116 struct buffer_head *bh, int *credits)
118 int err = journal_get_undo_access(handle, bh, credits);
120 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
125 __ext3_journal_get_write_access(const char *where, handle_t *handle,
126 struct buffer_head *bh, int *credits)
128 int err = journal_get_write_access(handle, bh, credits);
130 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
135 ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh,
138 journal_release_buffer(handle, bh, credits);
142 __ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
144 int err = journal_forget(handle, bh);
146 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
151 __ext3_journal_revoke(const char *where, handle_t *handle,
152 unsigned long blocknr, struct buffer_head *bh)
154 int err = journal_revoke(handle, blocknr, bh);
156 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
161 __ext3_journal_get_create_access(const char *where,
162 handle_t *handle, struct buffer_head *bh)
164 int err = journal_get_create_access(handle, bh);
166 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
171 __ext3_journal_dirty_metadata(const char *where,
172 handle_t *handle, struct buffer_head *bh)
174 int err = journal_dirty_metadata(handle, bh);
176 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
181 #define ext3_journal_get_undo_access(handle, bh, credits) \
182 __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh), (credits))
183 #define ext3_journal_get_write_access(handle, bh) \
184 __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh), NULL)
185 #define ext3_journal_get_write_access_credits(handle, bh, credits) \
186 __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh), (credits))
187 #define ext3_journal_revoke(handle, blocknr, bh) \
188 __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
189 #define ext3_journal_get_create_access(handle, bh) \
190 __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
191 #define ext3_journal_dirty_metadata(handle, bh) \
192 __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
193 #define ext3_journal_forget(handle, bh) \
194 __ext3_journal_forget(__FUNCTION__, (handle), (bh))
196 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
197 int __ext3_journal_stop(const char *where, handle_t *handle);
199 static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
201 return ext3_journal_start_sb(inode->i_sb, nblocks);
204 #define ext3_journal_stop(handle) \
205 __ext3_journal_stop(__FUNCTION__, (handle))
207 static inline handle_t *ext3_journal_current_handle(void)
209 return journal_current_handle();
212 static inline int ext3_journal_extend(handle_t *handle, int nblocks)
214 return journal_extend(handle, nblocks);
217 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
219 return journal_restart(handle, nblocks);
222 static inline int ext3_journal_blocks_per_page(struct inode *inode)
224 return journal_blocks_per_page(inode);
227 static inline int ext3_journal_force_commit(journal_t *journal)
229 return journal_force_commit(journal);
233 int ext3_force_commit(struct super_block *sb);
235 static inline int ext3_should_journal_data(struct inode *inode)
237 if (!S_ISREG(inode->i_mode))
239 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
241 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
246 static inline int ext3_should_order_data(struct inode *inode)
248 if (!S_ISREG(inode->i_mode))
250 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
252 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
257 static inline int ext3_should_writeback_data(struct inode *inode)
259 if (!S_ISREG(inode->i_mode))
261 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
263 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
268 #endif /* _LINUX_EXT3_JBD_H */