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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 */
178static inline void ext4_journal_callback_add(handle_t *handle,
179 void (*func)(struct super_block *sb,
180 struct ext4_journal_cb_entry *jce,
181 int rc),
182 struct ext4_journal_cb_entry *jce)
183{
184 struct ext4_sb_info *sbi =
185 EXT4_SB(handle->h_transaction->t_journal->j_private);
186
187 /* Add the jce to transaction's private list */
188 jce->jce_func = func;
189 spin_lock(&sbi->s_md_lock);
190 list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
191 spin_unlock(&sbi->s_md_lock);
192}
193
194/**
195 * ext4_journal_callback_del: delete a registered callback
196 * @handle: active journal transaction handle on which callback was registered
197 * @jce: registered journal callback entry to unregister
Anatol Pomozov70261f52013-08-28 14:40:12 -0400198 * Return true if object was successfully removed
Bobi Jam18aadd42012-02-20 17:53:02 -0500199 */
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400200static inline bool ext4_journal_callback_try_del(handle_t *handle,
Bobi Jam18aadd42012-02-20 17:53:02 -0500201 struct ext4_journal_cb_entry *jce)
202{
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400203 bool deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500204 struct ext4_sb_info *sbi =
205 EXT4_SB(handle->h_transaction->t_journal->j_private);
206
207 spin_lock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400208 deleted = !list_empty(&jce->jce_list);
Bobi Jam18aadd42012-02-20 17:53:02 -0500209 list_del_init(&jce->jce_list);
210 spin_unlock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400211 return deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500212}
213
Dave Kleikamp470decc2006-10-11 01:20:57 -0700214int
215ext4_mark_iloc_dirty(handle_t *handle,
216 struct inode *inode,
217 struct ext4_iloc *iloc);
218
219/*
220 * On success, We end up with an outstanding reference count against
221 * iloc->bh. This _must_ be cleaned up later.
222 */
223
224int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
225 struct ext4_iloc *iloc);
226
227int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
228
229/*
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500230 * Wrapper functions with which ext4 calls into JBD.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700231 */
Theodore Ts'o90c72012010-06-29 14:53:24 -0400232int __ext4_journal_get_write_access(const char *where, unsigned int line,
233 handle_t *handle, struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700234
Theodore Ts'o90c72012010-06-29 14:53:24 -0400235int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
236 int is_metadata, struct inode *inode,
237 struct buffer_head *bh, ext4_fsblk_t blocknr);
Theodore Ts'od6797d12009-11-22 20:52:12 -0500238
Theodore Ts'o90c72012010-06-29 14:53:24 -0400239int __ext4_journal_get_create_access(const char *where, unsigned int line,
Andrew Morton8984d132006-12-06 20:37:15 -0800240 handle_t *handle, struct buffer_head *bh);
241
Theodore Ts'o90c72012010-06-29 14:53:24 -0400242int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
243 handle_t *handle, struct inode *inode,
244 struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700245
Theodore Ts'o90c72012010-06-29 14:53:24 -0400246int __ext4_handle_dirty_super(const char *where, unsigned int line,
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400247 handle_t *handle, struct super_block *sb);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400248
Dave Kleikamp470decc2006-10-11 01:20:57 -0700249#define ext4_journal_get_write_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400250 __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
Theodore Ts'od6797d12009-11-22 20:52:12 -0500251#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400252 __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
253 (bh), (block_nr))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700254#define ext4_journal_get_create_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400255 __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
Frank Mayhar03901312009-01-07 00:06:22 -0500256#define ext4_handle_dirty_metadata(handle, inode, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400257 __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
258 (bh))
Theodore Ts'oa0375152010-06-11 23:14:04 -0400259#define ext4_handle_dirty_super(handle, sb) \
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400260 __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700261
Theodore Ts'o9924a922013-02-08 21:59:22 -0500262handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400263 int type, int blocks, int rsv_blocks);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400264int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700265
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400266#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
Frank Mayhar03901312009-01-07 00:06:22 -0500267
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400268/* Note: Do not use this for NULL handles. This is only to determine if
269 * a properly allocated handle is using a journal or not. */
Frank Mayhar03901312009-01-07 00:06:22 -0500270static inline int ext4_handle_valid(handle_t *handle)
271{
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400272 if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
Frank Mayhar03901312009-01-07 00:06:22 -0500273 return 0;
274 return 1;
275}
276
277static inline void ext4_handle_sync(handle_t *handle)
278{
279 if (ext4_handle_valid(handle))
280 handle->h_sync = 1;
281}
282
Frank Mayhar03901312009-01-07 00:06:22 -0500283static inline int ext4_handle_is_aborted(handle_t *handle)
284{
285 if (ext4_handle_valid(handle))
286 return is_handle_aborted(handle);
287 return 0;
288}
289
290static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
291{
292 if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
293 return 0;
294 return 1;
295}
296
Theodore Ts'o9924a922013-02-08 21:59:22 -0500297#define ext4_journal_start_sb(sb, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400298 __ext4_journal_start_sb((sb), __LINE__, (type), (nblocks), 0)
Theodore Ts'o9924a922013-02-08 21:59:22 -0500299
300#define ext4_journal_start(inode, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400301 __ext4_journal_start((inode), __LINE__, (type), (nblocks), 0)
302
303#define ext4_journal_start_with_reserve(inode, type, blocks, rsv_blocks) \
304 __ext4_journal_start((inode), __LINE__, (type), (blocks), (rsv_blocks))
Theodore Ts'o9924a922013-02-08 21:59:22 -0500305
306static inline handle_t *__ext4_journal_start(struct inode *inode,
307 unsigned int line, int type,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400308 int blocks, int rsv_blocks)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700309{
Jan Kara5fe2fe82013-06-04 12:37:50 -0400310 return __ext4_journal_start_sb(inode->i_sb, line, type, blocks,
311 rsv_blocks);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700312}
313
314#define ext4_journal_stop(handle) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400315 __ext4_journal_stop(__func__, __LINE__, (handle))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700316
Jan Kara6b523df2013-06-04 13:21:11 -0400317#define ext4_journal_start_reserved(handle, type) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400318 __ext4_journal_start_reserved((handle), __LINE__, (type))
319
320handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
321 int type);
322
323static inline void ext4_journal_free_reserved(handle_t *handle)
324{
325 if (ext4_handle_valid(handle))
326 jbd2_journal_free_reserved(handle);
327}
328
Dave Kleikamp470decc2006-10-11 01:20:57 -0700329static inline handle_t *ext4_journal_current_handle(void)
330{
331 return journal_current_handle();
332}
333
334static inline int ext4_journal_extend(handle_t *handle, int nblocks)
335{
Frank Mayhar03901312009-01-07 00:06:22 -0500336 if (ext4_handle_valid(handle))
337 return jbd2_journal_extend(handle, nblocks);
338 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700339}
340
341static inline int ext4_journal_restart(handle_t *handle, int nblocks)
342{
Frank Mayhar03901312009-01-07 00:06:22 -0500343 if (ext4_handle_valid(handle))
344 return jbd2_journal_restart(handle, nblocks);
345 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700346}
347
348static inline int ext4_journal_blocks_per_page(struct inode *inode)
349{
Frank Mayhar03901312009-01-07 00:06:22 -0500350 if (EXT4_JOURNAL(inode) != NULL)
351 return jbd2_journal_blocks_per_page(inode);
352 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700353}
354
355static inline int ext4_journal_force_commit(journal_t *journal)
356{
Frank Mayhar03901312009-01-07 00:06:22 -0500357 if (journal)
358 return jbd2_journal_force_commit(journal);
359 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700360}
361
Jan Kara678aaf42008-07-11 19:27:31 -0400362static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
363{
Frank Mayhar03901312009-01-07 00:06:22 -0500364 if (ext4_handle_valid(handle))
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500365 return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
Frank Mayhar03901312009-01-07 00:06:22 -0500366 return 0;
Jan Kara678aaf42008-07-11 19:27:31 -0400367}
368
Jan Karab436b9b2009-12-08 23:51:10 -0500369static inline void ext4_update_inode_fsync_trans(handle_t *handle,
370 struct inode *inode,
371 int datasync)
372{
373 struct ext4_inode_info *ei = EXT4_I(inode);
374
375 if (ext4_handle_valid(handle)) {
376 ei->i_sync_tid = handle->h_transaction->t_tid;
377 if (datasync)
378 ei->i_datasync_tid = handle->h_transaction->t_tid;
379 }
380}
381
Dave Kleikamp470decc2006-10-11 01:20:57 -0700382/* super.c */
383int ext4_force_commit(struct super_block *sb);
384
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500385/*
386 * Ext4 inode journal modes
387 */
388#define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */
389#define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */
390#define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */
391
392static inline int ext4_inode_journal_mode(struct inode *inode)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700393{
Frank Mayhar03901312009-01-07 00:06:22 -0500394 if (EXT4_JOURNAL(inode) == NULL)
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500395 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
396 /* We do not support data journalling with delayed allocation */
397 if (!S_ISREG(inode->i_mode) ||
398 test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
399 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
400 if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
401 !test_opt(inode->i_sb, DELALLOC))
402 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
403 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
404 return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
405 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
406 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
407 else
408 BUG();
409}
410
411static inline int ext4_should_journal_data(struct inode *inode)
412{
413 return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700414}
415
416static inline int ext4_should_order_data(struct inode *inode)
417{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500418 return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700419}
420
421static inline int ext4_should_writeback_data(struct inode *inode)
422{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500423 return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700424}
425
Jiaying Zhang744692d2010-03-04 16:14:02 -0500426/*
427 * This function controls whether or not we should try to go down the
428 * dioread_nolock code paths, which makes it safe to avoid taking
429 * i_mutex for direct I/O reads. This only works for extent-based
Christoph Hellwig206f7ab2010-06-14 14:42:49 -0400430 * files, and it doesn't work if data journaling is enabled, since the
431 * dioread_nolock code uses b_private to pass information back to the
432 * I/O completion handler, and this conflicts with the jbd's use of
433 * b_private.
Jiaying Zhang744692d2010-03-04 16:14:02 -0500434 */
435static inline int ext4_should_dioread_nolock(struct inode *inode)
436{
437 if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
438 return 0;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500439 if (!S_ISREG(inode->i_mode))
440 return 0;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400441 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Jiaying Zhang744692d2010-03-04 16:14:02 -0500442 return 0;
443 if (ext4_should_journal_data(inode))
444 return 0;
445 return 1;
446}
447
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400448#endif /* _EXT4_JBD2_H */