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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) \
Theodore Ts'o83982b62009-01-06 14:53:16 -050037 (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
Jan Karaf45a5ef2013-04-09 12:39:26 -040038 ? 20U : 8U)
Dave Kleikamp470decc2006-10-11 01:20:57 -070039
40/* Extended attribute operations touch at most two data buffers,
41 * two bitmap buffers, and two group summaries, in addition to the inode
42 * and the superblock, which are already accounted for. */
43
44#define EXT4_XATTR_TRANS_BLOCKS 6U
45
46/* Define the minimum size for a transaction which modifies data. This
47 * needs to take into account the fact that we may end up modifying two
48 * quota files too (one for the group, one for the user quota). The
49 * superblock only gets updated once, of course, so don't bother
50 * counting that again for the quota updates. */
51
Alex Tomasa86c6182006-10-11 01:21:03 -070052#define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
Dave Kleikamp470decc2006-10-11 01:20:57 -070053 EXT4_XATTR_TRANS_BLOCKS - 2 + \
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050054 EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -070055
Mingming Caoa02908f2008-08-19 22:16:07 -040056/*
57 * Define the number of metadata blocks we need to account to modify data.
58 *
59 * This include super block, inode block, quota blocks and xattr blocks
60 */
61#define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050062 EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
Mingming Caoa02908f2008-08-19 22:16:07 -040063
Dave Kleikamp470decc2006-10-11 01:20:57 -070064/* Define an arbitrary limit for the amount of data we will anticipate
65 * writing to any given transaction. For unbounded transactions such as
66 * write(2) and truncate(2) we can write more than this, but we always
67 * start off at the maximum transaction size and grow the transaction
68 * optimistically as we go. */
69
70#define EXT4_MAX_TRANS_DATA 64U
71
72/* We break up a large truncate or write transaction once the handle's
73 * buffer credits gets this low, we need either to extend the
74 * transaction or to start a new one. Reserve enough space here for
75 * inode, bitmap, superblock, group and indirection updates for at least
76 * one block, plus two quota updates. Quota allocations are not
77 * needed. */
78
79#define EXT4_RESERVE_TRANS_BLOCKS 12U
80
81#define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
82
83#ifdef CONFIG_QUOTA
84/* Amount of blocks needed for quota update - we know that the structure was
Jan Kara21f97692011-04-04 15:33:39 -040085 * allocated so we need to update only data block */
Aditya Kali7c319d32012-07-22 20:21:31 -040086#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
87 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
88 1 : 0)
Dave Kleikamp470decc2006-10-11 01:20:57 -070089/* Amount of blocks needed for quota insert/delete - we do some block writes
90 * but inode, sb and group updates are done only once */
Aditya Kali7c319d32012-07-22 20:21:31 -040091#define EXT4_QUOTA_INIT_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
92 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
93 (DQUOT_INIT_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
94 +3+DQUOT_INIT_REWRITE) : 0)
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -050095
Aditya Kali7c319d32012-07-22 20:21:31 -040096#define EXT4_QUOTA_DEL_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
97 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
98 (DQUOT_DEL_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
99 +3+DQUOT_DEL_REWRITE) : 0)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700100#else
101#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
102#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
103#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
104#endif
Jan Karaa2d4a642014-09-11 11:15:15 -0400105#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
106#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
107#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700108
Theodore Ts'o95eaefb2013-02-09 15:23:03 -0500109static inline int ext4_jbd2_credits_xattr(struct inode *inode)
110{
111 int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb);
112
113 /*
114 * In case of inline data, we may push out the data to a block,
115 * so we need to reserve credits for this eventuality
116 */
117 if (ext4_has_inline_data(inode))
118 credits += ext4_writepage_trans_blocks(inode) + 1;
119 return credits;
120}
121
122
Theodore Ts'o9924a922013-02-08 21:59:22 -0500123/*
124 * Ext4 handle operation types -- for logging purposes
125 */
126#define EXT4_HT_MISC 0
127#define EXT4_HT_INODE 1
128#define EXT4_HT_WRITE_PAGE 2
129#define EXT4_HT_MAP_BLOCKS 3
130#define EXT4_HT_DIR 4
131#define EXT4_HT_TRUNCATE 5
132#define EXT4_HT_QUOTA 6
133#define EXT4_HT_RESIZE 7
134#define EXT4_HT_MIGRATE 8
135#define EXT4_HT_MOVE_EXTENTS 9
136#define EXT4_HT_XATTR 10
Jan Kara6b523df2013-06-04 13:21:11 -0400137#define EXT4_HT_EXT_CONVERT 11
138#define EXT4_HT_MAX 12
Theodore Ts'o9924a922013-02-08 21:59:22 -0500139
Bobi Jam18aadd42012-02-20 17:53:02 -0500140/**
141 * struct ext4_journal_cb_entry - Base structure for callback information.
142 *
143 * This struct is a 'seed' structure for a using with your own callback
144 * structs. If you are using callbacks you must allocate one of these
145 * or another struct of your own definition which has this struct
146 * as it's first element and pass it to ext4_journal_callback_add().
147 */
148struct ext4_journal_cb_entry {
149 /* list information for other callbacks attached to the same handle */
150 struct list_head jce_list;
151
152 /* Function to call with this callback structure */
153 void (*jce_func)(struct super_block *sb,
154 struct ext4_journal_cb_entry *jce, int error);
155
156 /* user data goes here */
157};
158
159/**
160 * ext4_journal_callback_add: add a function to call after transaction commit
161 * @handle: active journal transaction handle to register callback on
162 * @func: callback function to call after the transaction has committed:
163 * @sb: superblock of current filesystem for transaction
164 * @jce: returned journal callback data
165 * @rc: journal state at commit (0 = transaction committed properly)
166 * @jce: journal callback data (internal and function private data struct)
167 *
168 * The registered function will be called in the context of the journal thread
169 * after the transaction for which the handle was created has completed.
170 *
171 * No locks are held when the callback function is called, so it is safe to
172 * call blocking functions from within the callback, but the callback should
173 * not block or run for too long, or the filesystem will be blocked waiting for
174 * the next transaction to commit. No journaling functions can be used, or
175 * there is a risk of deadlock.
176 *
177 * There is no guaranteed calling order of multiple registered callbacks on
178 * the same transaction.
179 */
180static inline void ext4_journal_callback_add(handle_t *handle,
181 void (*func)(struct super_block *sb,
182 struct ext4_journal_cb_entry *jce,
183 int rc),
184 struct ext4_journal_cb_entry *jce)
185{
186 struct ext4_sb_info *sbi =
187 EXT4_SB(handle->h_transaction->t_journal->j_private);
188
189 /* Add the jce to transaction's private list */
190 jce->jce_func = func;
191 spin_lock(&sbi->s_md_lock);
192 list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
193 spin_unlock(&sbi->s_md_lock);
194}
195
196/**
197 * ext4_journal_callback_del: delete a registered callback
198 * @handle: active journal transaction handle on which callback was registered
199 * @jce: registered journal callback entry to unregister
Anatol Pomozov70261f52013-08-28 14:40:12 -0400200 * Return true if object was successfully removed
Bobi Jam18aadd42012-02-20 17:53:02 -0500201 */
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400202static inline bool ext4_journal_callback_try_del(handle_t *handle,
Bobi Jam18aadd42012-02-20 17:53:02 -0500203 struct ext4_journal_cb_entry *jce)
204{
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400205 bool deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500206 struct ext4_sb_info *sbi =
207 EXT4_SB(handle->h_transaction->t_journal->j_private);
208
209 spin_lock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400210 deleted = !list_empty(&jce->jce_list);
Bobi Jam18aadd42012-02-20 17:53:02 -0500211 list_del_init(&jce->jce_list);
212 spin_unlock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400213 return deleted;
Bobi Jam18aadd42012-02-20 17:53:02 -0500214}
215
Dave Kleikamp470decc2006-10-11 01:20:57 -0700216int
217ext4_mark_iloc_dirty(handle_t *handle,
218 struct inode *inode,
219 struct ext4_iloc *iloc);
220
221/*
222 * On success, We end up with an outstanding reference count against
223 * iloc->bh. This _must_ be cleaned up later.
224 */
225
226int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
227 struct ext4_iloc *iloc);
228
229int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
230
231/*
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500232 * Wrapper functions with which ext4 calls into JBD.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700233 */
Theodore Ts'o90c72012010-06-29 14:53:24 -0400234int __ext4_journal_get_write_access(const char *where, unsigned int line,
235 handle_t *handle, struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700236
Theodore Ts'o90c72012010-06-29 14:53:24 -0400237int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
238 int is_metadata, struct inode *inode,
239 struct buffer_head *bh, ext4_fsblk_t blocknr);
Theodore Ts'od6797d12009-11-22 20:52:12 -0500240
Theodore Ts'o90c72012010-06-29 14:53:24 -0400241int __ext4_journal_get_create_access(const char *where, unsigned int line,
Andrew Morton8984d132006-12-06 20:37:15 -0800242 handle_t *handle, struct buffer_head *bh);
243
Theodore Ts'o90c72012010-06-29 14:53:24 -0400244int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
245 handle_t *handle, struct inode *inode,
246 struct buffer_head *bh);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700247
Theodore Ts'o90c72012010-06-29 14:53:24 -0400248int __ext4_handle_dirty_super(const char *where, unsigned int line,
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400249 handle_t *handle, struct super_block *sb);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400250
Dave Kleikamp470decc2006-10-11 01:20:57 -0700251#define ext4_journal_get_write_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400252 __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
Theodore Ts'od6797d12009-11-22 20:52:12 -0500253#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400254 __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
255 (bh), (block_nr))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700256#define ext4_journal_get_create_access(handle, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400257 __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
Frank Mayhar03901312009-01-07 00:06:22 -0500258#define ext4_handle_dirty_metadata(handle, inode, bh) \
Theodore Ts'o90c72012010-06-29 14:53:24 -0400259 __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
260 (bh))
Theodore Ts'oa0375152010-06-11 23:14:04 -0400261#define ext4_handle_dirty_super(handle, sb) \
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400262 __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700263
Theodore Ts'o9924a922013-02-08 21:59:22 -0500264handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400265 int type, int blocks, int rsv_blocks);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400266int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700267
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400268#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
Frank Mayhar03901312009-01-07 00:06:22 -0500269
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400270/* Note: Do not use this for NULL handles. This is only to determine if
271 * a properly allocated handle is using a journal or not. */
Frank Mayhar03901312009-01-07 00:06:22 -0500272static inline int ext4_handle_valid(handle_t *handle)
273{
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400274 if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
Frank Mayhar03901312009-01-07 00:06:22 -0500275 return 0;
276 return 1;
277}
278
279static inline void ext4_handle_sync(handle_t *handle)
280{
281 if (ext4_handle_valid(handle))
282 handle->h_sync = 1;
283}
284
Frank Mayhar03901312009-01-07 00:06:22 -0500285static inline int ext4_handle_is_aborted(handle_t *handle)
286{
287 if (ext4_handle_valid(handle))
288 return is_handle_aborted(handle);
289 return 0;
290}
291
292static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
293{
294 if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
295 return 0;
296 return 1;
297}
298
Theodore Ts'o9924a922013-02-08 21:59:22 -0500299#define ext4_journal_start_sb(sb, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400300 __ext4_journal_start_sb((sb), __LINE__, (type), (nblocks), 0)
Theodore Ts'o9924a922013-02-08 21:59:22 -0500301
302#define ext4_journal_start(inode, type, nblocks) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400303 __ext4_journal_start((inode), __LINE__, (type), (nblocks), 0)
304
305#define ext4_journal_start_with_reserve(inode, type, blocks, rsv_blocks) \
306 __ext4_journal_start((inode), __LINE__, (type), (blocks), (rsv_blocks))
Theodore Ts'o9924a922013-02-08 21:59:22 -0500307
308static inline handle_t *__ext4_journal_start(struct inode *inode,
309 unsigned int line, int type,
Jan Kara5fe2fe82013-06-04 12:37:50 -0400310 int blocks, int rsv_blocks)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700311{
Jan Kara5fe2fe82013-06-04 12:37:50 -0400312 return __ext4_journal_start_sb(inode->i_sb, line, type, blocks,
313 rsv_blocks);
Dave Kleikamp470decc2006-10-11 01:20:57 -0700314}
315
316#define ext4_journal_stop(handle) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400317 __ext4_journal_stop(__func__, __LINE__, (handle))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700318
Jan Kara6b523df2013-06-04 13:21:11 -0400319#define ext4_journal_start_reserved(handle, type) \
Jan Kara5fe2fe82013-06-04 12:37:50 -0400320 __ext4_journal_start_reserved((handle), __LINE__, (type))
321
322handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
323 int type);
324
325static inline void ext4_journal_free_reserved(handle_t *handle)
326{
327 if (ext4_handle_valid(handle))
328 jbd2_journal_free_reserved(handle);
329}
330
Dave Kleikamp470decc2006-10-11 01:20:57 -0700331static inline handle_t *ext4_journal_current_handle(void)
332{
333 return journal_current_handle();
334}
335
336static inline int ext4_journal_extend(handle_t *handle, int nblocks)
337{
Frank Mayhar03901312009-01-07 00:06:22 -0500338 if (ext4_handle_valid(handle))
339 return jbd2_journal_extend(handle, nblocks);
340 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700341}
342
343static inline int ext4_journal_restart(handle_t *handle, int nblocks)
344{
Frank Mayhar03901312009-01-07 00:06:22 -0500345 if (ext4_handle_valid(handle))
346 return jbd2_journal_restart(handle, nblocks);
347 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700348}
349
350static inline int ext4_journal_blocks_per_page(struct inode *inode)
351{
Frank Mayhar03901312009-01-07 00:06:22 -0500352 if (EXT4_JOURNAL(inode) != NULL)
353 return jbd2_journal_blocks_per_page(inode);
354 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700355}
356
357static inline int ext4_journal_force_commit(journal_t *journal)
358{
Frank Mayhar03901312009-01-07 00:06:22 -0500359 if (journal)
360 return jbd2_journal_force_commit(journal);
361 return 0;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700362}
363
Jan Kara678aaf42008-07-11 19:27:31 -0400364static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
365{
Frank Mayhar03901312009-01-07 00:06:22 -0500366 if (ext4_handle_valid(handle))
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500367 return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
Frank Mayhar03901312009-01-07 00:06:22 -0500368 return 0;
Jan Kara678aaf42008-07-11 19:27:31 -0400369}
370
Jan Karab436b9b2009-12-08 23:51:10 -0500371static inline void ext4_update_inode_fsync_trans(handle_t *handle,
372 struct inode *inode,
373 int datasync)
374{
375 struct ext4_inode_info *ei = EXT4_I(inode);
376
377 if (ext4_handle_valid(handle)) {
378 ei->i_sync_tid = handle->h_transaction->t_tid;
379 if (datasync)
380 ei->i_datasync_tid = handle->h_transaction->t_tid;
381 }
382}
383
Dave Kleikamp470decc2006-10-11 01:20:57 -0700384/* super.c */
385int ext4_force_commit(struct super_block *sb);
386
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500387/*
388 * Ext4 inode journal modes
389 */
390#define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */
391#define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */
392#define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */
393
394static inline int ext4_inode_journal_mode(struct inode *inode)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700395{
Frank Mayhar03901312009-01-07 00:06:22 -0500396 if (EXT4_JOURNAL(inode) == NULL)
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500397 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
398 /* We do not support data journalling with delayed allocation */
399 if (!S_ISREG(inode->i_mode) ||
400 test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
401 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
402 if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
403 !test_opt(inode->i_sb, DELALLOC))
404 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
405 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
406 return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
407 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
408 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
409 else
410 BUG();
411}
412
413static inline int ext4_should_journal_data(struct inode *inode)
414{
415 return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700416}
417
418static inline int ext4_should_order_data(struct inode *inode)
419{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500420 return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700421}
422
423static inline int ext4_should_writeback_data(struct inode *inode)
424{
Lukas Czerner3d2b1582012-02-20 17:53:00 -0500425 return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700426}
427
Jiaying Zhang744692d2010-03-04 16:14:02 -0500428/*
429 * This function controls whether or not we should try to go down the
430 * dioread_nolock code paths, which makes it safe to avoid taking
431 * i_mutex for direct I/O reads. This only works for extent-based
Christoph Hellwig206f7ab2010-06-14 14:42:49 -0400432 * files, and it doesn't work if data journaling is enabled, since the
433 * dioread_nolock code uses b_private to pass information back to the
434 * I/O completion handler, and this conflicts with the jbd's use of
435 * b_private.
Jiaying Zhang744692d2010-03-04 16:14:02 -0500436 */
437static inline int ext4_should_dioread_nolock(struct inode *inode)
438{
439 if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
440 return 0;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500441 if (!S_ISREG(inode->i_mode))
442 return 0;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400443 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Jiaying Zhang744692d2010-03-04 16:14:02 -0500444 return 0;
445 if (ext4_should_journal_data(inode))
446 return 0;
447 return 1;
448}
449
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400450#endif /* _EXT4_JBD2_H */