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linux-sg2042/fs/ocfs2/journal.h

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* journal.h
*
* Defines journalling api and structures.
*
* Copyright (C) 2003, 2005 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef OCFS2_JOURNAL_H
#define OCFS2_JOURNAL_H
#include <linux/fs.h>
#include <linux/jbd2.h>
enum ocfs2_journal_state {
OCFS2_JOURNAL_FREE = 0,
OCFS2_JOURNAL_LOADED,
OCFS2_JOURNAL_IN_SHUTDOWN,
};
struct ocfs2_super;
struct ocfs2_dinode;
/*
* The recovery_list is a simple linked list of node numbers to recover.
* It is protected by the recovery_lock.
*/
struct ocfs2_recovery_map {
unsigned int rm_used;
unsigned int *rm_entries;
};
struct ocfs2_journal {
enum ocfs2_journal_state j_state; /* Journals current state */
journal_t *j_journal; /* The kernels journal type */
struct inode *j_inode; /* Kernel inode pointing to
* this journal */
struct ocfs2_super *j_osb; /* pointer to the super
* block for the node
* we're currently
* running on -- not
* necessarily the super
* block from the node
* which we usually run
* from (recovery,
* etc) */
struct buffer_head *j_bh; /* Journal disk inode block */
atomic_t j_num_trans; /* Number of transactions
* currently in the system. */
unsigned long j_trans_id;
struct rw_semaphore j_trans_barrier;
wait_queue_head_t j_checkpointed;
spinlock_t j_lock;
struct list_head j_la_cleanups;
struct work_struct j_recovery_work;
};
extern spinlock_t trans_inc_lock;
/* wrap j_trans_id so we never have it equal to zero. */
static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j)
{
unsigned long old_id;
spin_lock(&trans_inc_lock);
old_id = j->j_trans_id++;
if (unlikely(!j->j_trans_id))
j->j_trans_id = 1;
spin_unlock(&trans_inc_lock);
return old_id;
}
static inline void ocfs2_set_ci_lock_trans(struct ocfs2_journal *journal,
struct ocfs2_caching_info *ci)
{
spin_lock(&trans_inc_lock);
ci->ci_last_trans = journal->j_trans_id;
spin_unlock(&trans_inc_lock);
}
/* Used to figure out whether it's safe to drop a metadata lock on an
* cached object. Returns true if all the object's changes have been
* checkpointed to disk. You should be holding the spinlock on the
* metadata lock while calling this to be sure that nobody can take
* the lock and put it on another transaction. */
static inline int ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci)
{
int ret;
struct ocfs2_journal *journal =
OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
spin_lock(&trans_inc_lock);
ret = time_after(journal->j_trans_id, ci->ci_last_trans);
spin_unlock(&trans_inc_lock);
return ret;
}
/* convenience function to check if an object backed by struct
* ocfs2_caching_info is still new (has never hit disk) Will do you a
* favor and set created_trans = 0 when you've
* been checkpointed. returns '1' if the ci is still new. */
static inline int ocfs2_ci_is_new(struct ocfs2_caching_info *ci)
{
int ret;
struct ocfs2_journal *journal =
OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
spin_lock(&trans_inc_lock);
ret = !(time_after(journal->j_trans_id, ci->ci_created_trans));
if (!ret)
ci->ci_created_trans = 0;
spin_unlock(&trans_inc_lock);
return ret;
}
/* Wrapper for inodes so we can check system files */
static inline int ocfs2_inode_is_new(struct inode *inode)
{
/* System files are never "new" as they're written out by
* mkfs. This helps us early during mount, before we have the
* journal open and j_trans_id could be junk. */
if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
return 0;
return ocfs2_ci_is_new(INODE_CACHE(inode));
}
static inline void ocfs2_ci_set_new(struct ocfs2_super *osb,
struct ocfs2_caching_info *ci)
{
spin_lock(&trans_inc_lock);
ci->ci_created_trans = osb->journal->j_trans_id;
spin_unlock(&trans_inc_lock);
}
/* Exported only for the journal struct init code in super.c. Do not call. */
void ocfs2_orphan_scan_init(struct ocfs2_super *osb);
void ocfs2_orphan_scan_start(struct ocfs2_super *osb);
void ocfs2_orphan_scan_stop(struct ocfs2_super *osb);
void ocfs2_orphan_scan_exit(struct ocfs2_super *osb);
void ocfs2_complete_recovery(struct work_struct *work);
void ocfs2_wait_for_recovery(struct ocfs2_super *osb);
int ocfs2_recovery_init(struct ocfs2_super *osb);
void ocfs2_recovery_exit(struct ocfs2_super *osb);
int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
/*
* Journal Control:
* Initialize, Load, Shutdown, Wipe a journal.
*
* ocfs2_journal_init - Initialize journal structures in the OSB.
* ocfs2_journal_load - Load the given journal off disk. Replay it if
* there's transactions still in there.
* ocfs2_journal_shutdown - Shutdown a journal, this will flush all
* uncommitted, uncheckpointed transactions.
* ocfs2_journal_wipe - Wipe transactions from a journal. Optionally
* zero out each block.
* ocfs2_recovery_thread - Perform recovery on a node. osb is our own osb.
* ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat
* event on.
* ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint.
*/
void ocfs2_set_journal_params(struct ocfs2_super *osb);
int ocfs2_journal_init(struct ocfs2_journal *journal,
int *dirty);
void ocfs2_journal_shutdown(struct ocfs2_super *osb);
int ocfs2_journal_wipe(struct ocfs2_journal *journal,
int full);
int ocfs2_journal_load(struct ocfs2_journal *journal, int local,
int replayed);
int ocfs2_check_journals_nolocks(struct ocfs2_super *osb);
void ocfs2_recovery_thread(struct ocfs2_super *osb,
int node_num);
int ocfs2_mark_dead_nodes(struct ocfs2_super *osb);
void ocfs2_complete_mount_recovery(struct ocfs2_super *osb);
void ocfs2_complete_quota_recovery(struct ocfs2_super *osb);
static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb)
{
atomic_set(&osb->needs_checkpoint, 1);
wake_up(&osb->checkpoint_event);
}
static inline void ocfs2_checkpoint_inode(struct inode *inode)
{
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (ocfs2_mount_local(osb))
return;
if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) {
/* WARNING: This only kicks off a single
* checkpoint. If someone races you and adds more
* metadata to the journal, you won't know, and will
* wind up waiting *alot* longer than necessary. Right
* now we only use this in clear_inode so that's
* OK. */
ocfs2_start_checkpoint(osb);
wait_event(osb->journal->j_checkpointed,
ocfs2_ci_fully_checkpointed(INODE_CACHE(inode)));
}
}
/*
* Transaction Handling:
* Manage the lifetime of a transaction handle.
*
* ocfs2_start_trans - Begin a transaction. Give it an upper estimate of
* the number of blocks that will be changed during
* this handle.
* ocfs2_commit_trans - Complete a handle. It might return -EIO if
* the journal was aborted. The majority of paths don't
* check the return value as an error there comes too
* late to do anything (and will be picked up in a
* later transaction).
* ocfs2_extend_trans - Extend a handle by nblocks credits. This may
* commit the handle to disk in the process, but will
* not release any locks taken during the transaction.
* ocfs2_journal_access* - Notify the handle that we want to journal this
* buffer. Will have to call ocfs2_journal_dirty once
* we've actually dirtied it. Type is one of . or .
* Always call the specific flavor of
* ocfs2_journal_access_*() unless you intend to
* manage the checksum by hand.
* ocfs2_journal_dirty - Mark a journalled buffer as having dirty data.
* ocfs2_jbd2_file_inode - Mark an inode so that its data goes out before
* the current handle commits.
*/
/* You must always start_trans with a number of buffs > 0, but it's
* perfectly legal to go through an entire transaction without having
* dirtied any buffers. */
handle_t *ocfs2_start_trans(struct ocfs2_super *osb,
int max_buffs);
int ocfs2_commit_trans(struct ocfs2_super *osb,
handle_t *handle);
int ocfs2_extend_trans(handle_t *handle, int nblocks);
/*
* Create access is for when we get a newly created buffer and we're
* not gonna read it off disk, but rather fill it ourselves. Right
* now, we don't do anything special with this (it turns into a write
* request), but this is a good placeholder in case we do...
*
* Write access is for when we read a block off disk and are going to
* modify it. This way the journalling layer knows it may need to make
* a copy of that block (if it's part of another, uncommitted
* transaction) before we do so.
*/
#define OCFS2_JOURNAL_ACCESS_CREATE 0
#define OCFS2_JOURNAL_ACCESS_WRITE 1
#define OCFS2_JOURNAL_ACCESS_UNDO 2
/* ocfs2_inode */
int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_extent_block */
int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_refcount_block */
int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_group_desc */
int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_xattr_block */
int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* quota blocks */
int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* dirblock */
int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_dx_root_block */
int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* ocfs2_dx_leaf */
int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/* Anything that has no ecc */
int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
struct buffer_head *bh, int type);
/*
* A word about the journal_access/journal_dirty "dance". It is
* entirely legal to journal_access a buffer more than once (as long
* as the access type is the same -- I'm not sure what will happen if
* access type is different but this should never happen anyway) It is
* also legal to journal_dirty a buffer more than once. In fact, you
* can even journal_access a buffer after you've done a
* journal_access/journal_dirty pair. The only thing you cannot do
* however, is journal_dirty a buffer which you haven't yet passed to
* journal_access at least once.
*
* That said, 99% of the time this doesn't matter and this is what the
* path looks like:
*
* <read a bh>
* ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE);
* <modify the bh>
* ocfs2_journal_dirty(handle, bh);
*/
void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh);
/*
* Credit Macros:
* Convenience macros to calculate number of credits needed.
*
* For convenience sake, I have a set of macros here which calculate
* the *maximum* number of sectors which will be changed for various
* metadata updates.
*/
/* simple file updates like chmod, etc. */
#define OCFS2_INODE_UPDATE_CREDITS 1
/* extended attribute block update */
#define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1
/* Update of a single quota block */
#define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1
/* global quotafile inode update, data block */
#define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
#define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS
/*
* The two writes below can accidentally see global info dirty due
* to set_info() quotactl so make them prepared for the writes.
*/
/* quota data block, global info */
/* Write to local quota file */
#define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
/* global quota data block, local quota data block, global quota inode,
* global quota info */
#define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
static inline int ocfs2_quota_trans_credits(struct super_block *sb)
{
int credits = 0;
if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA))
credits += OCFS2_QWRITE_CREDITS;
if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA))
credits += OCFS2_QWRITE_CREDITS;
return credits;
}
/* group extend. inode update and last group update. */
#define OCFS2_GROUP_EXTEND_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* group add. inode update and the new group update. */
#define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* get one bit out of a suballocator: dinode + group descriptor +
* prev. group desc. if we relink. */
#define OCFS2_SUBALLOC_ALLOC (3)
static inline int ocfs2_inline_to_extents_credits(struct super_block *sb)
{
return OCFS2_SUBALLOC_ALLOC + OCFS2_INODE_UPDATE_CREDITS +
ocfs2_quota_trans_credits(sb);
}
/* dinode + group descriptor update. We don't relink on free yet. */
#define OCFS2_SUBALLOC_FREE (2)
#define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS
#define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE \
+ OCFS2_TRUNCATE_LOG_UPDATE)
static inline int ocfs2_remove_extent_credits(struct super_block *sb)
{
return OCFS2_TRUNCATE_LOG_UPDATE + OCFS2_INODE_UPDATE_CREDITS +
ocfs2_quota_trans_credits(sb);
}
/* data block for new dir/symlink, 2 for bitmap updates (bitmap fe +
* bitmap block for the new bit) dx_root update for free list */
#define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + 2 + 1)
static inline int ocfs2_add_dir_index_credits(struct super_block *sb)
{
/* 1 block for index, 2 allocs (data, metadata), 1 clusters
* worth of blocks for initial extent. */
return 1 + 2 * OCFS2_SUBALLOC_ALLOC +
ocfs2_clusters_to_blocks(sb, 1);
}
/* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode
* alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr
* blocks + quota update */
static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir,
int xattr_credits)
{
int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS;
if (is_dir)
dir_credits += ocfs2_add_dir_index_credits(sb);
return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits +
ocfs2_quota_trans_credits(sb);
}
/* local alloc metadata change + main bitmap updates */
#define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \
+ OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE)
/* used when we don't need an allocation change for a dir extend. One
* for the dinode, one for the new block. */
#define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2)
/* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota
* update on dir + index leaf + dx root update for free list */
static inline int ocfs2_link_credits(struct super_block *sb)
{
return 2*OCFS2_INODE_UPDATE_CREDITS + 3 +
ocfs2_quota_trans_credits(sb);
}
/* inode + dir inode (if we unlink a dir), + dir entry block + orphan
* dir inode link + dir inode index leaf + dir index root */
static inline int ocfs2_unlink_credits(struct super_block *sb)
{
/* The quota update from ocfs2_link_credits is unused here... */
return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb);
}
/* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry +
* inode alloc group descriptor + orphan dir index root +
* orphan dir index leaf */
#define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4)
/* dinode update, old dir dinode update, new dir dinode update, old
* dir dir entry, new dir dir entry, dir entry update for renaming
* directory + target unlink + 3 x dir index leaves */
static inline int ocfs2_rename_credits(struct super_block *sb)
{
return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb);
}
/* global bitmap dinode, group desc., relinked group,
* suballocator dinode, group desc., relinked group,
* dinode, xattr block */
#define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \
+ OCFS2_INODE_UPDATE_CREDITS \
+ OCFS2_XATTR_BLOCK_UPDATE_CREDITS)
/* inode update, removal of dx root block from allocator */
#define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
OCFS2_SUBALLOC_FREE)
static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
{
int credits = 1 + OCFS2_SUBALLOC_ALLOC;
credits += ocfs2_clusters_to_blocks(sb, 1);
credits += ocfs2_quota_trans_credits(sb);
return credits;
}
/* inode update, new refcount block and its allocation credits. */
#define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
+ OCFS2_SUBALLOC_ALLOC)
/* inode and the refcount block update. */
#define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/*
* inode and the refcount block update.
* It doesn't include the credits for sub alloc change.
* So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
*/
#define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* 2 metadata alloc, 2 new blocks and root refcount block */
#define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3)
/*
* Please note that the caller must make sure that root_el is the root
* of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
* the result may be wrong.
*/
static inline int ocfs2_calc_extend_credits(struct super_block *sb,
struct ocfs2_extent_list *root_el,
u32 bits_wanted)
{
int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks;
/* bitmap dinode, group desc. + relinked group. */
bitmap_blocks = OCFS2_SUBALLOC_ALLOC;
/* we might need to shift tree depth so lets assume an
* absolute worst case of complete fragmentation. Even with
* that, we only need one update for the dinode, and then
* however many metadata chunks needed * a remaining suballoc
* alloc. */
sysfile_bitmap_blocks = 1 +
(OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el);
/* this does not include *new* metadata blocks, which are
* accounted for in sysfile_bitmap_blocks. root_el +
* prev. last_eb_blk + blocks along edge of tree.
* calc_symlink_credits passes because we just need 1
* credit for the dinode there. */
extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth);
return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks +
ocfs2_quota_trans_credits(sb);
}
static inline int ocfs2_calc_symlink_credits(struct super_block *sb)
{
int blocks = ocfs2_mknod_credits(sb, 0, 0);
/* links can be longer than one block so we may update many
* within our single allocated extent. */
blocks += ocfs2_clusters_to_blocks(sb, 1);
return blocks + ocfs2_quota_trans_credits(sb);
}
static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb,
unsigned int cpg)
{
int blocks;
int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1;
/* parent inode update + new block group header + bitmap inode update
+ bitmap blocks affected */
blocks = 1 + 1 + 1 + bitmap_blocks;
return blocks;
}
/*
* Allocating a discontiguous block group requires the credits from
* ocfs2_calc_group_alloc_credits() as well as enough credits to fill
* the group descriptor's extent list. The caller already has started
* the transaction with ocfs2_calc_group_alloc_credits(). They extend
* it with these credits.
*/
static inline int ocfs2_calc_bg_discontig_credits(struct super_block *sb)
{
return ocfs2_extent_recs_per_gd(sb);
}
static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb,
unsigned int clusters_to_del,
struct ocfs2_dinode *fe,
struct ocfs2_extent_list *last_el)
{
/* for dinode + all headers in this pass + update to next leaf */
u16 next_free = le16_to_cpu(last_el->l_next_free_rec);
u16 tree_depth = le16_to_cpu(fe->id2.i_list.l_tree_depth);
int credits = 1 + tree_depth + 1;
int i;
i = next_free - 1;
BUG_ON(i < 0);
/* We may be deleting metadata blocks, so metadata alloc dinode +
one desc. block for each possible delete. */
if (tree_depth && next_free == 1 &&
ocfs2_rec_clusters(last_el, &last_el->l_recs[i]) == clusters_to_del)
credits += 1 + tree_depth;
/* update to the truncate log. */
credits += OCFS2_TRUNCATE_LOG_UPDATE;
credits += ocfs2_quota_trans_credits(sb);
return credits;
}
static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
{
return jbd2_journal_file_inode(handle, &OCFS2_I(inode)->ip_jinode);
}
static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
loff_t new_size)
{
return jbd2_journal_begin_ordered_truncate(
OCFS2_SB(inode->i_sb)->journal->j_journal,
&OCFS2_I(inode)->ip_jinode,
new_size);
}
#endif /* OCFS2_JOURNAL_H */
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