1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Defines journalling api and structures.
8 * Copyright (C) 2003, 2005 Oracle. All rights reserved.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
26 #ifndef OCFS2_JOURNAL_H
27 #define OCFS2_JOURNAL_H
30 #include <linux/jbd2.h>
32 enum ocfs2_journal_state {
33 OCFS2_JOURNAL_FREE = 0,
35 OCFS2_JOURNAL_IN_SHUTDOWN,
42 * The recovery_list is a simple linked list of node numbers to recover.
43 * It is protected by the recovery_lock.
46 struct ocfs2_recovery_map {
48 unsigned int *rm_entries;
52 struct ocfs2_journal {
53 enum ocfs2_journal_state j_state; /* Journals current state */
55 journal_t *j_journal; /* The kernels journal type */
56 struct inode *j_inode; /* Kernel inode pointing to
58 struct ocfs2_super *j_osb; /* pointer to the super
62 * necessarily the super
64 * which we usually run
67 struct buffer_head *j_bh; /* Journal disk inode block */
68 atomic_t j_num_trans; /* Number of transactions
69 * currently in the system. */
71 unsigned long j_trans_id;
72 struct rw_semaphore j_trans_barrier;
73 wait_queue_head_t j_checkpointed;
75 /* both fields protected by j_lock*/
76 struct list_head j_la_cleanups;
77 struct work_struct j_recovery_work;
80 extern spinlock_t trans_inc_lock;
82 /* wrap j_trans_id so we never have it equal to zero. */
83 static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j)
86 spin_lock(&trans_inc_lock);
87 old_id = j->j_trans_id++;
88 if (unlikely(!j->j_trans_id))
90 spin_unlock(&trans_inc_lock);
94 static inline void ocfs2_set_ci_lock_trans(struct ocfs2_journal *journal,
95 struct ocfs2_caching_info *ci)
97 spin_lock(&trans_inc_lock);
98 ci->ci_last_trans = journal->j_trans_id;
99 spin_unlock(&trans_inc_lock);
102 /* Used to figure out whether it's safe to drop a metadata lock on an
103 * cached object. Returns true if all the object's changes have been
104 * checkpointed to disk. You should be holding the spinlock on the
105 * metadata lock while calling this to be sure that nobody can take
106 * the lock and put it on another transaction. */
107 static inline int ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci)
110 struct ocfs2_journal *journal =
111 OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
113 spin_lock(&trans_inc_lock);
114 ret = time_after(journal->j_trans_id, ci->ci_last_trans);
115 spin_unlock(&trans_inc_lock);
119 /* convenience function to check if an object backed by struct
120 * ocfs2_caching_info is still new (has never hit disk) Will do you a
121 * favor and set created_trans = 0 when you've
122 * been checkpointed. returns '1' if the ci is still new. */
123 static inline int ocfs2_ci_is_new(struct ocfs2_caching_info *ci)
126 struct ocfs2_journal *journal =
127 OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
129 spin_lock(&trans_inc_lock);
130 ret = !(time_after(journal->j_trans_id, ci->ci_created_trans));
132 ci->ci_created_trans = 0;
133 spin_unlock(&trans_inc_lock);
137 /* Wrapper for inodes so we can check system files */
138 static inline int ocfs2_inode_is_new(struct inode *inode)
140 /* System files are never "new" as they're written out by
141 * mkfs. This helps us early during mount, before we have the
142 * journal open and j_trans_id could be junk. */
143 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
146 return ocfs2_ci_is_new(INODE_CACHE(inode));
149 static inline void ocfs2_ci_set_new(struct ocfs2_super *osb,
150 struct ocfs2_caching_info *ci)
152 spin_lock(&trans_inc_lock);
153 ci->ci_created_trans = osb->journal->j_trans_id;
154 spin_unlock(&trans_inc_lock);
157 /* Exported only for the journal struct init code in super.c. Do not call. */
158 void ocfs2_orphan_scan_init(struct ocfs2_super *osb);
159 void ocfs2_orphan_scan_start(struct ocfs2_super *osb);
160 void ocfs2_orphan_scan_stop(struct ocfs2_super *osb);
161 void ocfs2_orphan_scan_exit(struct ocfs2_super *osb);
163 void ocfs2_complete_recovery(struct work_struct *work);
164 void ocfs2_wait_for_recovery(struct ocfs2_super *osb);
166 int ocfs2_recovery_init(struct ocfs2_super *osb);
167 void ocfs2_recovery_exit(struct ocfs2_super *osb);
169 int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
172 * Initialize, Load, Shutdown, Wipe a journal.
174 * ocfs2_journal_init - Initialize journal structures in the OSB.
175 * ocfs2_journal_load - Load the given journal off disk. Replay it if
176 * there's transactions still in there.
177 * ocfs2_journal_shutdown - Shutdown a journal, this will flush all
178 * uncommitted, uncheckpointed transactions.
179 * ocfs2_journal_wipe - Wipe transactions from a journal. Optionally
180 * zero out each block.
181 * ocfs2_recovery_thread - Perform recovery on a node. osb is our own osb.
182 * ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat
184 * ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint.
186 void ocfs2_set_journal_params(struct ocfs2_super *osb);
187 int ocfs2_journal_init(struct ocfs2_journal *journal,
189 void ocfs2_journal_shutdown(struct ocfs2_super *osb);
190 int ocfs2_journal_wipe(struct ocfs2_journal *journal,
192 int ocfs2_journal_load(struct ocfs2_journal *journal, int local,
194 int ocfs2_check_journals_nolocks(struct ocfs2_super *osb);
195 void ocfs2_recovery_thread(struct ocfs2_super *osb,
197 int ocfs2_mark_dead_nodes(struct ocfs2_super *osb);
198 void ocfs2_complete_mount_recovery(struct ocfs2_super *osb);
199 void ocfs2_complete_quota_recovery(struct ocfs2_super *osb);
201 static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb)
203 wake_up(&osb->checkpoint_event);
206 static inline void ocfs2_checkpoint_inode(struct inode *inode)
208 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
210 if (ocfs2_mount_local(osb))
213 if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) {
214 /* WARNING: This only kicks off a single
215 * checkpoint. If someone races you and adds more
216 * metadata to the journal, you won't know, and will
217 * wind up waiting *a lot* longer than necessary. Right
218 * now we only use this in clear_inode so that's
220 ocfs2_start_checkpoint(osb);
222 wait_event(osb->journal->j_checkpointed,
223 ocfs2_ci_fully_checkpointed(INODE_CACHE(inode)));
228 * Transaction Handling:
229 * Manage the lifetime of a transaction handle.
231 * ocfs2_start_trans - Begin a transaction. Give it an upper estimate of
232 * the number of blocks that will be changed during
234 * ocfs2_commit_trans - Complete a handle. It might return -EIO if
235 * the journal was aborted. The majority of paths don't
236 * check the return value as an error there comes too
237 * late to do anything (and will be picked up in a
238 * later transaction).
239 * ocfs2_extend_trans - Extend a handle by nblocks credits. This may
240 * commit the handle to disk in the process, but will
241 * not release any locks taken during the transaction.
242 * ocfs2_journal_access* - Notify the handle that we want to journal this
243 * buffer. Will have to call ocfs2_journal_dirty once
244 * we've actually dirtied it. Type is one of . or .
245 * Always call the specific flavor of
246 * ocfs2_journal_access_*() unless you intend to
247 * manage the checksum by hand.
248 * ocfs2_journal_dirty - Mark a journalled buffer as having dirty data.
249 * ocfs2_jbd2_file_inode - Mark an inode so that its data goes out before
250 * the current handle commits.
253 /* You must always start_trans with a number of buffs > 0, but it's
254 * perfectly legal to go through an entire transaction without having
255 * dirtied any buffers. */
256 handle_t *ocfs2_start_trans(struct ocfs2_super *osb,
258 int ocfs2_commit_trans(struct ocfs2_super *osb,
260 int ocfs2_extend_trans(handle_t *handle, int nblocks);
263 * Create access is for when we get a newly created buffer and we're
264 * not gonna read it off disk, but rather fill it ourselves. Right
265 * now, we don't do anything special with this (it turns into a write
266 * request), but this is a good placeholder in case we do...
268 * Write access is for when we read a block off disk and are going to
269 * modify it. This way the journalling layer knows it may need to make
270 * a copy of that block (if it's part of another, uncommitted
271 * transaction) before we do so.
273 #define OCFS2_JOURNAL_ACCESS_CREATE 0
274 #define OCFS2_JOURNAL_ACCESS_WRITE 1
275 #define OCFS2_JOURNAL_ACCESS_UNDO 2
279 int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
280 struct buffer_head *bh, int type);
281 /* ocfs2_extent_block */
282 int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
283 struct buffer_head *bh, int type);
284 /* ocfs2_refcount_block */
285 int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
286 struct buffer_head *bh, int type);
287 /* ocfs2_group_desc */
288 int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
289 struct buffer_head *bh, int type);
290 /* ocfs2_xattr_block */
291 int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
292 struct buffer_head *bh, int type);
294 int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
295 struct buffer_head *bh, int type);
297 int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
298 struct buffer_head *bh, int type);
299 /* ocfs2_dx_root_block */
300 int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
301 struct buffer_head *bh, int type);
303 int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
304 struct buffer_head *bh, int type);
305 /* Anything that has no ecc */
306 int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
307 struct buffer_head *bh, int type);
310 * A word about the journal_access/journal_dirty "dance". It is
311 * entirely legal to journal_access a buffer more than once (as long
312 * as the access type is the same -- I'm not sure what will happen if
313 * access type is different but this should never happen anyway) It is
314 * also legal to journal_dirty a buffer more than once. In fact, you
315 * can even journal_access a buffer after you've done a
316 * journal_access/journal_dirty pair. The only thing you cannot do
317 * however, is journal_dirty a buffer which you haven't yet passed to
318 * journal_access at least once.
320 * That said, 99% of the time this doesn't matter and this is what the
324 * ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE);
326 * ocfs2_journal_dirty(handle, bh);
328 void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh);
332 * Convenience macros to calculate number of credits needed.
334 * For convenience sake, I have a set of macros here which calculate
335 * the *maximum* number of sectors which will be changed for various
339 /* simple file updates like chmod, etc. */
340 #define OCFS2_INODE_UPDATE_CREDITS 1
342 /* extended attribute block update */
343 #define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1
345 /* Update of a single quota block */
346 #define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1
348 /* global quotafile inode update, data block */
349 #define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
350 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
352 #define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS
354 * The two writes below can accidentally see global info dirty due
355 * to set_info() quotactl so make them prepared for the writes.
357 /* quota data block, global info */
358 /* Write to local quota file */
359 #define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
360 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
362 /* global quota data block, local quota data block, global quota inode,
363 * global quota info */
364 #define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
365 2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
367 static inline int ocfs2_quota_trans_credits(struct super_block *sb)
371 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA))
372 credits += OCFS2_QWRITE_CREDITS;
373 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA))
374 credits += OCFS2_QWRITE_CREDITS;
378 /* group extend. inode update and last group update. */
379 #define OCFS2_GROUP_EXTEND_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
381 /* group add. inode update and the new group update. */
382 #define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
384 /* get one bit out of a suballocator: dinode + group descriptor +
385 * prev. group desc. if we relink. */
386 #define OCFS2_SUBALLOC_ALLOC (3)
388 static inline int ocfs2_inline_to_extents_credits(struct super_block *sb)
390 return OCFS2_SUBALLOC_ALLOC + OCFS2_INODE_UPDATE_CREDITS +
391 ocfs2_quota_trans_credits(sb);
394 /* dinode + group descriptor update. We don't relink on free yet. */
395 #define OCFS2_SUBALLOC_FREE (2)
397 #define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS
398 #define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE \
399 + OCFS2_TRUNCATE_LOG_UPDATE)
401 static inline int ocfs2_remove_extent_credits(struct super_block *sb)
403 return OCFS2_TRUNCATE_LOG_UPDATE + OCFS2_INODE_UPDATE_CREDITS +
404 ocfs2_quota_trans_credits(sb);
407 /* data block for new dir/symlink, allocation of directory block, dx_root
408 * update for free list */
409 #define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + OCFS2_SUBALLOC_ALLOC + 1)
411 static inline int ocfs2_add_dir_index_credits(struct super_block *sb)
413 /* 1 block for index, 2 allocs (data, metadata), 1 clusters
414 * worth of blocks for initial extent. */
415 return 1 + 2 * OCFS2_SUBALLOC_ALLOC +
416 ocfs2_clusters_to_blocks(sb, 1);
419 /* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode
420 * alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr
421 * blocks + quota update */
422 static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir,
425 int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS;
428 dir_credits += ocfs2_add_dir_index_credits(sb);
430 return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits +
431 ocfs2_quota_trans_credits(sb);
434 /* local alloc metadata change + main bitmap updates */
435 #define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \
436 + OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE)
438 /* used when we don't need an allocation change for a dir extend. One
439 * for the dinode, one for the new block. */
440 #define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2)
442 /* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota
443 * update on dir + index leaf + dx root update for free list +
444 * previous dirblock update in the free list */
445 static inline int ocfs2_link_credits(struct super_block *sb)
447 return 2*OCFS2_INODE_UPDATE_CREDITS + 4 +
448 ocfs2_quota_trans_credits(sb);
451 /* inode + dir inode (if we unlink a dir), + dir entry block + orphan
452 * dir inode link + dir inode index leaf + dir index root */
453 static inline int ocfs2_unlink_credits(struct super_block *sb)
455 /* The quota update from ocfs2_link_credits is unused here... */
456 return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb);
459 /* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry +
460 * inode alloc group descriptor + orphan dir index root +
461 * orphan dir index leaf */
462 #define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4)
464 /* dinode update, old dir dinode update, new dir dinode update, old
465 * dir dir entry, new dir dir entry, dir entry update for renaming
466 * directory + target unlink + 3 x dir index leaves */
467 static inline int ocfs2_rename_credits(struct super_block *sb)
469 return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb);
472 /* global bitmap dinode, group desc., relinked group,
473 * suballocator dinode, group desc., relinked group,
474 * dinode, xattr block */
475 #define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \
476 + OCFS2_INODE_UPDATE_CREDITS \
477 + OCFS2_XATTR_BLOCK_UPDATE_CREDITS)
479 /* inode update, removal of dx root block from allocator */
480 #define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
483 static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
485 int credits = 1 + OCFS2_SUBALLOC_ALLOC;
487 credits += ocfs2_clusters_to_blocks(sb, 1);
488 credits += ocfs2_quota_trans_credits(sb);
493 /* inode update, new refcount block and its allocation credits. */
494 #define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
495 + OCFS2_SUBALLOC_ALLOC)
497 /* inode and the refcount block update. */
498 #define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
501 * inode and the refcount block update.
502 * It doesn't include the credits for sub alloc change.
503 * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
505 #define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
507 /* 2 metadata alloc, 2 new blocks and root refcount block */
508 #define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3)
511 * Please note that the caller must make sure that root_el is the root
512 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
513 * the result may be wrong.
515 static inline int ocfs2_calc_extend_credits(struct super_block *sb,
516 struct ocfs2_extent_list *root_el,
519 int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks;
521 /* bitmap dinode, group desc. + relinked group. */
522 bitmap_blocks = OCFS2_SUBALLOC_ALLOC;
524 /* we might need to shift tree depth so lets assume an
525 * absolute worst case of complete fragmentation. Even with
526 * that, we only need one update for the dinode, and then
527 * however many metadata chunks needed * a remaining suballoc
529 sysfile_bitmap_blocks = 1 +
530 (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el);
532 /* this does not include *new* metadata blocks, which are
533 * accounted for in sysfile_bitmap_blocks. root_el +
534 * prev. last_eb_blk + blocks along edge of tree.
535 * calc_symlink_credits passes because we just need 1
536 * credit for the dinode there. */
537 extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth);
539 return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks +
540 ocfs2_quota_trans_credits(sb);
543 static inline int ocfs2_calc_symlink_credits(struct super_block *sb)
545 int blocks = ocfs2_mknod_credits(sb, 0, 0);
547 /* links can be longer than one block so we may update many
548 * within our single allocated extent. */
549 blocks += ocfs2_clusters_to_blocks(sb, 1);
551 return blocks + ocfs2_quota_trans_credits(sb);
554 static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb,
558 int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1;
559 /* parent inode update + new block group header + bitmap inode update
560 + bitmap blocks affected */
561 blocks = 1 + 1 + 1 + bitmap_blocks;
566 * Allocating a discontiguous block group requires the credits from
567 * ocfs2_calc_group_alloc_credits() as well as enough credits to fill
568 * the group descriptor's extent list. The caller already has started
569 * the transaction with ocfs2_calc_group_alloc_credits(). They extend
570 * it with these credits.
572 static inline int ocfs2_calc_bg_discontig_credits(struct super_block *sb)
574 return ocfs2_extent_recs_per_gd(sb);
577 static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb,
578 unsigned int clusters_to_del,
579 struct ocfs2_dinode *fe,
580 struct ocfs2_extent_list *last_el)
582 /* for dinode + all headers in this pass + update to next leaf */
583 u16 next_free = le16_to_cpu(last_el->l_next_free_rec);
584 u16 tree_depth = le16_to_cpu(fe->id2.i_list.l_tree_depth);
585 int credits = 1 + tree_depth + 1;
591 /* We may be deleting metadata blocks, so metadata alloc dinode +
592 one desc. block for each possible delete. */
593 if (tree_depth && next_free == 1 &&
594 ocfs2_rec_clusters(last_el, &last_el->l_recs[i]) == clusters_to_del)
595 credits += 1 + tree_depth;
597 /* update to the truncate log. */
598 credits += OCFS2_TRUNCATE_LOG_UPDATE;
600 credits += ocfs2_quota_trans_credits(sb);
605 static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
607 return jbd2_journal_file_inode(handle, &OCFS2_I(inode)->ip_jinode);
610 static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
613 return jbd2_journal_begin_ordered_truncate(
614 OCFS2_SB(inode->i_sb)->journal->j_journal,
615 &OCFS2_I(inode)->ip_jinode,
619 #endif /* OCFS2_JOURNAL_H */