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Dave Kleikamp470decc2006-10-11 01:20:57 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4_jbd2.h
Dave Kleikamp470decc2006-10-11 01:20:57 -07003 *
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
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040015#ifndef _EXT4_JBD2_H
16#define _EXT4_JBD2_H
Dave Kleikamp470decc2006-10-11 01:20:57 -070017
18#include <linux/fs.h>
Mingming Caof7f4bcc2006-10-11 01:20:59 -070019#include <linux/jbd2.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040020#include "ext4.h"
Dave Kleikamp470decc2006-10-11 01:20:57 -070021
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
Alex Tomasa86c6182006-10-11 01:21:03 -070029 * block to complete the transaction.
30 *
Randy Dunlapd0d856e2006-10-11 01:21:07 -070031 * For extents-enabled fs we may have to allocate and modify up to
Jan Karaf45a5ef2013-04-09 12:39:26 -040032 * 5 levels of tree, data block (for each of these we need bitmap + group
33 * summaries), root which is stored in the inode, sb
34 */
Dave Kleikamp470decc2006-10-11 01:20:57 -070035
Alex Tomasa86c6182006-10-11 01:21:03 -070036#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
Darrick J. Wonge2b911c2015-10-17 16:18:43 -040037 (ext4_has_feature_extents(sb) ? 20U : 8U)
Dave Kleikamp470decc2006-10-11 01:20:57 -070038
39/* Extended attribute operations touch at most two data buffers,
40 * two bitmap buffers, and two group summaries, in addition to the inode
41 * and the superblock, which are already accounted for. */
42
43#define EXT4_XATTR_TRANS_BLOCKS 6U
44
45/* Define the minimum size for a transaction which modifies data. This
46 * needs to take into account the fact that we may end up modifying two
47 * quota files too (one for the group, one for the user quota). The
48 * superblock only gets updated once, of course, so don't bother
49 * counting that again for the quota updates. */
50
Alex Tomasa86c6182006-10-11 01:21:03 -070051#define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
Dave Kleikamp470decc2006-10-11 01:20:57 -070052 EXT4_XATTR_TRANS_BLOCKS - 2 + \
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050053 EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -070054
Mingming Caoa02908f2008-08-19 22:16:07 -040055/*
56 * Define the number of metadata blocks we need to account to modify data.
57 *
58 * This include super block, inode block, quota blocks and xattr blocks
59 */
60#define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050061 EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
Mingming Caoa02908f2008-08-19 22:16:07 -040062
Dave Kleikamp470decc2006-10-11 01:20:57 -070063/* Define an arbitrary limit for the amount of data we will anticipate
64 * writing to any given transaction. For unbounded transactions such as
65 * write(2) and truncate(2) we can write more than this, but we always
66 * start off at the maximum transaction size and grow the transaction
67 * optimistically as we go. */
68
69#define EXT4_MAX_TRANS_DATA 64U
70
71/* We break up a large truncate or write transaction once the handle's
72 * buffer credits gets this low, we need either to extend the
73 * transaction or to start a new one. Reserve enough space here for
74 * inode, bitmap, superblock, group and indirection updates for at least
75 * one block, plus two quota updates. Quota allocations are not
76 * needed. */
77
78#define EXT4_RESERVE_TRANS_BLOCKS 12U
79
80#define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
81
82#ifdef CONFIG_QUOTA
83/* Amount of blocks needed for quota update - we know that the structure was
Jan Kara21f97692011-04-04 15:33:39 -040084 * allocated so we need to update only data block */
Aditya Kali7c319d32012-07-22 20:21:31 -040085#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
Darrick J. Wonge2b911c2015-10-17 16:18:43 -040086 ext4_has_feature_quota(sb)) ? 1 : 0)
Dave Kleikamp470decc2006-10-11 01:20:57 -070087/* Amount of blocks needed for quota insert/delete - we do some block writes
88 * but inode, sb and group updates are done only once */
Aditya Kali7c319d32012-07-22 20:21:31 -040089#define EXT4_QUOTA_INIT_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
Darrick J. Wonge2b911c2015-10-17 16:18:43 -040090 ext4_has_feature_quota(sb)) ?\
Aditya Kali7c319d32012-07-22 20:21:31 -040091 (DQUOT_INIT_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
92 +3+DQUOT_INIT_REWRITE) : 0)
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050093
Aditya Kali7c319d32012-07-22 20:21:31 -040094#define EXT4_QUOTA_DEL_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
Darrick J. Wonge2b911c2015-10-17 16:18:43 -040095 ext4_has_feature_quota(sb)) ?\
Aditya Kali7c319d32012-07-22 20:21:31 -040096 (DQUOT_DEL_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
97 +3+DQUOT_DEL_REWRITE) : 0)
Dave Kleikamp470decc2006-10-11 01:20:57 -070098#else
99#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
100#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
101#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
102#endif
Jan Karaa2d4a642014-09-11 11:15:15 -0400103#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
104#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
105#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700106
Theodore Ts'o95eaefb2013-02-09 15:23:03 -0500107static inline int ext4_jbd2_credits_xattr(struct inode *inode)
108{
109 int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb);
110
111 /*
112 * In case of inline data, we may push out the data to a block,
113 * so we need to reserve credits for this eventuality
114 */
115 if (ext4_has_inline_data(inode))
116 credits += ext4_writepage_trans_blocks(inode) + 1;
117 return credits;
118}
119
120
Theodore Ts'o9924a922013-02-08 21:59:22 -0500121/*
122 * Ext4 handle operation types -- for logging purposes
123 */
124#define EXT4_HT_MISC 0
125#define EXT4_HT_INODE 1
126#define EXT4_HT_WRITE_PAGE 2
127#define EXT4_HT_MAP_BLOCKS 3
128#define EXT4_HT_DIR 4
129#define EXT4_HT_TRUNCATE 5
130#define EXT4_HT_QUOTA 6
131#define EXT4_HT_RESIZE 7
132#define EXT4_HT_MIGRATE 8
133#define EXT4_HT_MOVE_EXTENTS 9
134#define EXT4_HT_XATTR 10
Jan Kara6b523df2013-06-04 13:21:11 -0400135#define EXT4_HT_EXT_CONVERT 11
136#define EXT4_HT_MAX 12
Theodore Ts'o9924a922013-02-08 21:59:22 -0500137
Bobi Jam18aadd42012-02-20 17:53:02 -0500138/**
139 * struct ext4_journal_cb_entry - Base structure for callback information.
140 *
141 * This struct is a 'seed' structure for a using with your own callback
142 * structs. If you are using callbacks you must allocate one of these
143 * or another struct of your own definition which has this struct
144 * as it's first element and pass it to ext4_journal_callback_add().
145 */
146struct ext4_journal_cb_entry {
147 /* list information for other callbacks attached to the same handle */
148 struct list_head jce_list;
149
150 /* Function to call with this callback structure */
151 void (*jce_func)(struct super_block *sb,
152 struct ext4_journal_cb_entry *jce, int error);
153
154 /* user data goes here */
155};
156
157/**
158 * ext4_journal_callback_add: add a function to call after transaction commit
159 * @handle: active journal transaction handle to register callback on
160 * @func: callback function to call after the transaction has committed:
161 * @sb: superblock of current filesystem for transaction
162 * @jce: returned journal callback data
163 * @rc: journal state at commit (0 = transaction committed properly)
164 * @jce: journal callback data (internal and function private data struct)
165 *
166 * The registered function will be called in the context of the journal thread
167 * after the transaction for which the handle was created has completed.
168 *
169 * No locks are held when the callback function is called, so it is safe to
170 * call blocking functions from within the callback, but the callback should
171 * not block or run for too long, or the filesystem will be blocked waiting for
172 * the next transaction to commit. No journaling functions can be used, or
173 * there is a risk of deadlock.
174 *
175 * There is no guaranteed calling order of multiple registered callbacks on
176 * the same transaction.
177 */
Theodore Ts'od08854f2016-06-26 18:24:01 -0400178static inline void _ext4_journal_callback_add(handle_t *handle,
179 struct ext4_journal_cb_entry *jce)
180{
181 /* Add the jce to transaction's private list */
182 list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
183}
184
Bobi Jam18aadd42012-02-20 17:53:02 -0500185static inline void ext4_journal_callback_add(handle_t *handle,
186 void (*func)(struct super_block *sb,
187 struct ext4_journal_cb_entry *jce,
188 int rc),
189 struct ext4_journal_cb_entry *jce)
190{
191 struct ext4_sb_info *sbi =
192 EXT4_SB(handle->h_transaction->t_journal->j_private);
193
194 /* Add the jce to transaction's private list */
195 jce->jce_func = func;
196 spin_lock(&sbi->s_md_lock);
Theodore Ts'od08854f2016-06-26 18:24:01 -0400197 _ext4_journal_callback_add(handle, jce);
Bobi Jam18aadd42012-02-20 17:53:02 -0500198 spin_unlock(&sbi->s_md_lock);
199}
200
Theodore Ts'od08854f2016-06-26 18:24:01 -0400201
Bobi Jam18aadd42012-02-20 17:53:02 -0500202/**
203 * ext4_journal_callback_del: delete a registered callback
204 * @handle: active journal transaction handle on which callback was registered
205 * @jce: registered journal callback entry to unregister
Anatol Pomozov70261f52013-08-28 14:40:12 -0400206 * Return true if object was successfully removed
Bobi Jam18aadd42012-02-20 17:53:02 -0500207 */
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400208static inline bool ext4_journal_callback_try_del(handle_t *handle,
Bobi Jam18aadd42012-02-20 17:53:02 -0500209 struct ext4_journal_cb_entry *jce)
210{
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400211 bool deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500212 struct ext4_sb_info *sbi =
213 EXT4_SB(handle->h_transaction->t_journal->j_private);
214
215 spin_lock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400216 deleted = !list_empty(&jce->jce_list);
Bobi Jam18aadd42012-02-20 17:53:02 -0500217 list_del_init(&jce->jce_list);
218 spin_unlock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400219 return deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500220}
221
Dave Kleikamp470decc2006-10-11 01:20:57 -0700222int
223ext4_mark_iloc_dirty(handle_t *handle,
224 struct inode *inode,
225 struct ext4_iloc *iloc);
226
227/*
228 * On success, We end up with an outstanding reference count against
229 * iloc->bh. This _must_ be cleaned up later.
230 */
231
232int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
233 struct ext4_iloc *iloc);
234
235int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
236
237/*
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500238 * Wrapper functions with which ext4 calls into JBD.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700239 */
Theodore Ts'o90c72012010-06-29 14:53:24 -0400240int __ext4_journal_get_write_access(const char *where, unsigned int line,
241 handle_t *handle, struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700242
Theodore Ts'o90c72012010-06-29 14:53:24 -0400243int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
244 int is_metadata, struct inode *inode,
245 struct buffer_head *bh, ext4_fsblk_t blocknr);
Theodore Ts'od6797d12009-11-22 20:52:12 -0500246
Theodore Ts'o90c72012010-06-29 14:53:24 -0400247int __ext4_journal_get_create_access(const char *where, unsigned int line,
Andrew Morton8984d132006-12-06 20:37:15 -0800248 handle_t *handle, struct buffer_head *bh);
249
Theodore Ts'o90c72012010-06-29 14:53:24 -0400250int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
251 handle_t *handle, struct inode *inode,
252 struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700253
Theodore Ts'o90c72012010-06-29 14:53:24 -0400254int __ext4_handle_dirty_super(const char *where, unsigned int line,
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400255 handle_t *handle, struct super_block *sb);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400256
Dave Kleikamp470decc2006-10-11 01:20:57 -0700257#define ext4_journal_get_write_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400258 __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
Theodore Ts'od6797d12009-11-22 20:52:12 -0500259#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400260 __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
261 (bh), (block_nr))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700262#define ext4_journal_get_create_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400263 __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
Frank Mayhar03901312009-01-07 00:06:22 -0500264#define ext4_handle_dirty_metadata(handle, inode, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400265 __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
266 (bh))
Theodore Ts'oa0375152010-06-11 23:14:04 -0400267#define ext4_handle_dirty_super(handle, sb) \
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400268 __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700269
Theodore Ts'o9924a922013-02-08 21:59:22 -0500270handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400271 int type, int blocks, int rsv_blocks);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400272int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700273
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400274#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
Frank Mayhar03901312009-01-07 00:06:22 -0500275
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400276/* Note: Do not use this for NULL handles. This is only to determine if
277 * a properly allocated handle is using a journal or not. */
Frank Mayhar03901312009-01-07 00:06:22 -0500278static inline int ext4_handle_valid(handle_t *handle)
279{
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400280 if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
Frank Mayhar03901312009-01-07 00:06:22 -0500281 return 0;
282 return 1;
283}
284
285static inline void ext4_handle_sync(handle_t *handle)
286{
287 if (ext4_handle_valid(handle))
288 handle->h_sync = 1;
289}
290
Frank Mayhar03901312009-01-07 00:06:22 -0500291static inline int ext4_handle_is_aborted(handle_t *handle)
292{
293 if (ext4_handle_valid(handle))
294 return is_handle_aborted(handle);
295 return 0;
296}
297
298static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
299{
300 if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
301 return 0;
302 return 1;
303}
304
Theodore Ts'o9924a922013-02-08 21:59:22 -0500305#define ext4_journal_start_sb(sb, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400306 __ext4_journal_start_sb((sb), __LINE__, (type), (nblocks), 0)
Theodore Ts'o9924a922013-02-08 21:59:22 -0500307
308#define ext4_journal_start(inode, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400309 __ext4_journal_start((inode), __LINE__, (type), (nblocks), 0)
310
311#define ext4_journal_start_with_reserve(inode, type, blocks, rsv_blocks) \
312 __ext4_journal_start((inode), __LINE__, (type), (blocks), (rsv_blocks))
Theodore Ts'o9924a922013-02-08 21:59:22 -0500313
314static inline handle_t *__ext4_journal_start(struct inode *inode,
315 unsigned int line, int type,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400316 int blocks, int rsv_blocks)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700317{
Jan Kara5fe2fe82013-06-04 12:37:50 -0400318 return __ext4_journal_start_sb(inode->i_sb, line, type, blocks,
319 rsv_blocks);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700320}
321
322#define ext4_journal_stop(handle) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400323 __ext4_journal_stop(__func__, __LINE__, (handle))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700324
Jan Kara6b523df2013-06-04 13:21:11 -0400325#define ext4_journal_start_reserved(handle, type) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400326 __ext4_journal_start_reserved((handle), __LINE__, (type))
327
328handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
329 int type);
330
331static inline void ext4_journal_free_reserved(handle_t *handle)
332{
333 if (ext4_handle_valid(handle))
334 jbd2_journal_free_reserved(handle);
335}
336
Dave Kleikamp470decc2006-10-11 01:20:57 -0700337static inline handle_t *ext4_journal_current_handle(void)
338{
339 return journal_current_handle();
340}
341
342static inline int ext4_journal_extend(handle_t *handle, int nblocks)
343{
Frank Mayhar03901312009-01-07 00:06:22 -0500344 if (ext4_handle_valid(handle))
345 return jbd2_journal_extend(handle, nblocks);
346 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700347}
348
349static inline int ext4_journal_restart(handle_t *handle, int nblocks)
350{
Frank Mayhar03901312009-01-07 00:06:22 -0500351 if (ext4_handle_valid(handle))
352 return jbd2_journal_restart(handle, nblocks);
353 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700354}
355
356static inline int ext4_journal_blocks_per_page(struct inode *inode)
357{
Frank Mayhar03901312009-01-07 00:06:22 -0500358 if (EXT4_JOURNAL(inode) != NULL)
359 return jbd2_journal_blocks_per_page(inode);
360 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700361}
362
363static inline int ext4_journal_force_commit(journal_t *journal)
364{
Frank Mayhar03901312009-01-07 00:06:22 -0500365 if (journal)
366 return jbd2_journal_force_commit(journal);
367 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700368}
369
Jan Karaee0876b2016-04-24 00:56:08 -0400370static inline int ext4_jbd2_inode_add_write(handle_t *handle,
371 struct inode *inode)
Jan Kara678aaf42008-07-11 19:27:31 -0400372{
Frank Mayhar03901312009-01-07 00:06:22 -0500373 if (ext4_handle_valid(handle))
Jan Kara41617e12016-04-24 00:56:07 -0400374 return jbd2_journal_inode_add_write(handle,
375 EXT4_I(inode)->jinode);
Frank Mayhar03901312009-01-07 00:06:22 -0500376 return 0;
Jan Kara678aaf42008-07-11 19:27:31 -0400377}
378
Jan Karaee0876b2016-04-24 00:56:08 -0400379static inline int ext4_jbd2_inode_add_wait(handle_t *handle,
380 struct inode *inode)
381{
382 if (ext4_handle_valid(handle))
383 return jbd2_journal_inode_add_wait(handle,
384 EXT4_I(inode)->jinode);
385 return 0;
386}
387
Jan Karab436b9b2009-12-08 23:51:10 -0500388static inline void ext4_update_inode_fsync_trans(handle_t *handle,
389 struct inode *inode,
390 int datasync)
391{
392 struct ext4_inode_info *ei = EXT4_I(inode);
393
394 if (ext4_handle_valid(handle)) {
395 ei->i_sync_tid = handle->h_transaction->t_tid;
396 if (datasync)
397 ei->i_datasync_tid = handle->h_transaction->t_tid;
398 }
399}
400
Dave Kleikamp470decc2006-10-11 01:20:57 -0700401/* super.c */
402int ext4_force_commit(struct super_block *sb);
403
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500404/*
405 * Ext4 inode journal modes
406 */
407#define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */
408#define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */
409#define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */
410
411static inline int ext4_inode_journal_mode(struct inode *inode)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700412{
Frank Mayhar03901312009-01-07 00:06:22 -0500413 if (EXT4_JOURNAL(inode) == NULL)
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500414 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
415 /* We do not support data journalling with delayed allocation */
416 if (!S_ISREG(inode->i_mode) ||
417 test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
418 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
419 if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
420 !test_opt(inode->i_sb, DELALLOC))
421 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
422 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
423 return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
424 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
425 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
426 else
427 BUG();
428}
429
430static inline int ext4_should_journal_data(struct inode *inode)
431{
432 return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700433}
434
435static inline int ext4_should_order_data(struct inode *inode)
436{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500437 return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700438}
439
440static inline int ext4_should_writeback_data(struct inode *inode)
441{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500442 return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700443}
444
Jiaying Zhang744692d2010-03-04 16:14:02 -0500445/*
446 * This function controls whether or not we should try to go down the
447 * dioread_nolock code paths, which makes it safe to avoid taking
448 * i_mutex for direct I/O reads. This only works for extent-based
Christoph Hellwig206f7ab2010-06-14 14:42:49 -0400449 * files, and it doesn't work if data journaling is enabled, since the
450 * dioread_nolock code uses b_private to pass information back to the
451 * I/O completion handler, and this conflicts with the jbd's use of
452 * b_private.
Jiaying Zhang744692d2010-03-04 16:14:02 -0500453 */
454static inline int ext4_should_dioread_nolock(struct inode *inode)
455{
456 if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
457 return 0;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500458 if (!S_ISREG(inode->i_mode))
459 return 0;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400460 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Jiaying Zhang744692d2010-03-04 16:14:02 -0500461 return 0;
462 if (ext4_should_journal_data(inode))
463 return 0;
464 return 1;
465}
466
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400467#endif /* _EXT4_JBD2_H */