journal.c 37.2 KB
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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * journal.c
 *
 * Defines functions of journalling api
 *
 * Copyright (C) 2003, 2004 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.
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/kthread.h>

#define MLOG_MASK_PREFIX ML_JOURNAL
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
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#include "dir.h"
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#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "slot_map.h"
#include "super.h"
#include "sysfile.h"

#include "buffer_head_io.h"

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DEFINE_SPINLOCK(trans_inc_lock);
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static int ocfs2_force_read_journal(struct inode *inode);
static int ocfs2_recover_node(struct ocfs2_super *osb,
			      int node_num);
static int __ocfs2_recovery_thread(void *arg);
static int ocfs2_commit_cache(struct ocfs2_super *osb);
static int ocfs2_wait_on_mount(struct ocfs2_super *osb);
static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
				      int dirty);
static int ocfs2_trylock_journal(struct ocfs2_super *osb,
				 int slot_num);
static int ocfs2_recover_orphans(struct ocfs2_super *osb,
				 int slot);
static int ocfs2_commit_thread(void *arg);

static int ocfs2_commit_cache(struct ocfs2_super *osb)
{
	int status = 0;
	unsigned int flushed;
	unsigned long old_id;
	struct ocfs2_journal *journal = NULL;

	mlog_entry_void();

	journal = osb->journal;

	/* Flush all pending commits and checkpoint the journal. */
	down_write(&journal->j_trans_barrier);

	if (atomic_read(&journal->j_num_trans) == 0) {
		up_write(&journal->j_trans_barrier);
		mlog(0, "No transactions for me to flush!\n");
		goto finally;
	}

	journal_lock_updates(journal->j_journal);
	status = journal_flush(journal->j_journal);
	journal_unlock_updates(journal->j_journal);
	if (status < 0) {
		up_write(&journal->j_trans_barrier);
		mlog_errno(status);
		goto finally;
	}

	old_id = ocfs2_inc_trans_id(journal);

	flushed = atomic_read(&journal->j_num_trans);
	atomic_set(&journal->j_num_trans, 0);
	up_write(&journal->j_trans_barrier);

	mlog(0, "commit_thread: flushed transaction %lu (%u handles)\n",
	     journal->j_trans_id, flushed);

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	ocfs2_wake_downconvert_thread(osb);
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	wake_up(&journal->j_checkpointed);
finally:
	mlog_exit(status);
	return status;
}

/* pass it NULL and it will allocate a new handle object for you.  If
 * you pass it a handle however, it may still return error, in which
 * case it has free'd the passed handle for you. */
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handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
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{
	journal_t *journal = osb->journal->j_journal;
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	handle_t *handle;
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	BUG_ON(!osb || !osb->journal->j_journal);
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	if (ocfs2_is_hard_readonly(osb))
		return ERR_PTR(-EROFS);
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	BUG_ON(osb->journal->j_state == OCFS2_JOURNAL_FREE);
	BUG_ON(max_buffs <= 0);

	/* JBD might support this, but our journalling code doesn't yet. */
	if (journal_current_handle()) {
		mlog(ML_ERROR, "Recursive transaction attempted!\n");
		BUG();
	}

	down_read(&osb->journal->j_trans_barrier);

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	handle = journal_start(journal, max_buffs);
	if (IS_ERR(handle)) {
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		up_read(&osb->journal->j_trans_barrier);

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		mlog_errno(PTR_ERR(handle));
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		if (is_journal_aborted(journal)) {
			ocfs2_abort(osb->sb, "Detected aborted journal");
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			handle = ERR_PTR(-EROFS);
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		}
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	} else {
		if (!ocfs2_mount_local(osb))
			atomic_inc(&(osb->journal->j_num_trans));
	}
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	return handle;
}

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int ocfs2_commit_trans(struct ocfs2_super *osb,
		       handle_t *handle)
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{
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	int ret;
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	struct ocfs2_journal *journal = osb->journal;
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	BUG_ON(!handle);

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	ret = journal_stop(handle);
	if (ret < 0)
		mlog_errno(ret);
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	up_read(&journal->j_trans_barrier);

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	return ret;
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}

/*
 * 'nblocks' is what you want to add to the current
 * transaction. extend_trans will either extend the current handle by
 * nblocks, or commit it and start a new one with nblocks credits.
 *
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 * This might call journal_restart() which will commit dirty buffers
 * and then restart the transaction. Before calling
 * ocfs2_extend_trans(), any changed blocks should have been
 * dirtied. After calling it, all blocks which need to be changed must
 * go through another set of journal_access/journal_dirty calls.
 *
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 * WARNING: This will not release any semaphores or disk locks taken
 * during the transaction, so make sure they were taken *before*
 * start_trans or we'll have ordering deadlocks.
 *
 * WARNING2: Note that we do *not* drop j_trans_barrier here. This is
 * good because transaction ids haven't yet been recorded on the
 * cluster locks associated with this handle.
 */
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int ocfs2_extend_trans(handle_t *handle, int nblocks)
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{
	int status;

	BUG_ON(!handle);
	BUG_ON(!nblocks);

	mlog_entry_void();

	mlog(0, "Trying to extend transaction by %d blocks\n", nblocks);

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#ifdef OCFS2_DEBUG_FS
	status = 1;
#else
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	status = journal_extend(handle, nblocks);
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	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}
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#endif
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	if (status > 0) {
		mlog(0, "journal_extend failed, trying journal_restart\n");
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		status = journal_restart(handle, nblocks);
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		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
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	}
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	status = 0;
bail:

	mlog_exit(status);
	return status;
}

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int ocfs2_journal_access(handle_t *handle,
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			 struct inode *inode,
			 struct buffer_head *bh,
			 int type)
{
	int status;

	BUG_ON(!inode);
	BUG_ON(!handle);
	BUG_ON(!bh);

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	mlog_entry("bh->b_blocknr=%llu, type=%d (\"%s\"), bh->b_size = %zu\n",
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		   (unsigned long long)bh->b_blocknr, type,
		   (type == OCFS2_JOURNAL_ACCESS_CREATE) ?
		   "OCFS2_JOURNAL_ACCESS_CREATE" :
		   "OCFS2_JOURNAL_ACCESS_WRITE",
		   bh->b_size);

	/* we can safely remove this assertion after testing. */
	if (!buffer_uptodate(bh)) {
		mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n");
		mlog(ML_ERROR, "b_blocknr=%llu\n",
		     (unsigned long long)bh->b_blocknr);
		BUG();
	}

	/* Set the current transaction information on the inode so
	 * that the locking code knows whether it can drop it's locks
	 * on this inode or not. We're protected from the commit
	 * thread updating the current transaction id until
	 * ocfs2_commit_trans() because ocfs2_start_trans() took
	 * j_trans_barrier for us. */
	ocfs2_set_inode_lock_trans(OCFS2_SB(inode->i_sb)->journal, inode);

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	mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
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	switch (type) {
	case OCFS2_JOURNAL_ACCESS_CREATE:
	case OCFS2_JOURNAL_ACCESS_WRITE:
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		status = journal_get_write_access(handle, bh);
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		break;

	case OCFS2_JOURNAL_ACCESS_UNDO:
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		status = journal_get_undo_access(handle, bh);
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		break;

	default:
		status = -EINVAL;
		mlog(ML_ERROR, "Uknown access type!\n");
	}
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	mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
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	if (status < 0)
		mlog(ML_ERROR, "Error %d getting %d access to buffer!\n",
		     status, type);

	mlog_exit(status);
	return status;
}

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int ocfs2_journal_dirty(handle_t *handle,
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			struct buffer_head *bh)
{
	int status;

	mlog_entry("(bh->b_blocknr=%llu)\n",
		   (unsigned long long)bh->b_blocknr);

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	status = journal_dirty_metadata(handle, bh);
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	if (status < 0)
		mlog(ML_ERROR, "Could not dirty metadata buffer. "
		     "(bh->b_blocknr=%llu)\n",
		     (unsigned long long)bh->b_blocknr);

	mlog_exit(status);
	return status;
}

int ocfs2_journal_dirty_data(handle_t *handle,
			     struct buffer_head *bh)
{
	int err = journal_dirty_data(handle, bh);
	if (err)
		mlog_errno(err);
	/* TODO: When we can handle it, abort the handle and go RO on
	 * error here. */

	return err;
}

#define OCFS2_DEFAULT_COMMIT_INTERVAL 	(HZ * 5)

void ocfs2_set_journal_params(struct ocfs2_super *osb)
{
	journal_t *journal = osb->journal->j_journal;

	spin_lock(&journal->j_state_lock);
	journal->j_commit_interval = OCFS2_DEFAULT_COMMIT_INTERVAL;
	if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
		journal->j_flags |= JFS_BARRIER;
	else
		journal->j_flags &= ~JFS_BARRIER;
	spin_unlock(&journal->j_state_lock);
}

int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
{
	int status = -1;
	struct inode *inode = NULL; /* the journal inode */
	journal_t *j_journal = NULL;
	struct ocfs2_dinode *di = NULL;
	struct buffer_head *bh = NULL;
	struct ocfs2_super *osb;
	int meta_lock = 0;

	mlog_entry_void();

	BUG_ON(!journal);

	osb = journal->j_osb;

	/* already have the inode for our journal */
	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    osb->slot_num);
	if (inode == NULL) {
		status = -EACCES;
		mlog_errno(status);
		goto done;
	}
	if (is_bad_inode(inode)) {
		mlog(ML_ERROR, "access error (bad inode)\n");
		iput(inode);
		inode = NULL;
		status = -EACCES;
		goto done;
	}

	SET_INODE_JOURNAL(inode);
	OCFS2_I(inode)->ip_open_count++;

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	/* Skip recovery waits here - journal inode metadata never
	 * changes in a live cluster so it can be considered an
	 * exception to the rule. */
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	status = ocfs2_meta_lock_full(inode, &bh, 1, OCFS2_META_LOCK_RECOVERY);
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	if (status < 0) {
		if (status != -ERESTARTSYS)
			mlog(ML_ERROR, "Could not get lock on journal!\n");
		goto done;
	}

	meta_lock = 1;
	di = (struct ocfs2_dinode *)bh->b_data;

	if (inode->i_size <  OCFS2_MIN_JOURNAL_SIZE) {
		mlog(ML_ERROR, "Journal file size (%lld) is too small!\n",
		     inode->i_size);
		status = -EINVAL;
		goto done;
	}

	mlog(0, "inode->i_size = %lld\n", inode->i_size);
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	mlog(0, "inode->i_blocks = %llu\n",
			(unsigned long long)inode->i_blocks);
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	mlog(0, "inode->ip_clusters = %u\n", OCFS2_I(inode)->ip_clusters);

	/* call the kernels journal init function now */
	j_journal = journal_init_inode(inode);
	if (j_journal == NULL) {
		mlog(ML_ERROR, "Linux journal layer error\n");
		status = -EINVAL;
		goto done;
	}

	mlog(0, "Returned from journal_init_inode\n");
	mlog(0, "j_journal->j_maxlen = %u\n", j_journal->j_maxlen);

	*dirty = (le32_to_cpu(di->id1.journal1.ij_flags) &
		  OCFS2_JOURNAL_DIRTY_FL);

	journal->j_journal = j_journal;
	journal->j_inode = inode;
	journal->j_bh = bh;

	ocfs2_set_journal_params(osb);

	journal->j_state = OCFS2_JOURNAL_LOADED;

	status = 0;
done:
	if (status < 0) {
		if (meta_lock)
			ocfs2_meta_unlock(inode, 1);
		if (bh != NULL)
			brelse(bh);
		if (inode) {
			OCFS2_I(inode)->ip_open_count--;
			iput(inode);
		}
	}

	mlog_exit(status);
	return status;
}

static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
				      int dirty)
{
	int status;
	unsigned int flags;
	struct ocfs2_journal *journal = osb->journal;
	struct buffer_head *bh = journal->j_bh;
	struct ocfs2_dinode *fe;

	mlog_entry_void();

	fe = (struct ocfs2_dinode *)bh->b_data;
	if (!OCFS2_IS_VALID_DINODE(fe)) {
		/* This is called from startup/shutdown which will
		 * handle the errors in a specific manner, so no need
		 * to call ocfs2_error() here. */
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		mlog(ML_ERROR, "Journal dinode %llu  has invalid "
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		     "signature: %.*s",
		     (unsigned long long)le64_to_cpu(fe->i_blkno), 7,
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		     fe->i_signature);
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		status = -EIO;
		goto out;
	}

	flags = le32_to_cpu(fe->id1.journal1.ij_flags);
	if (dirty)
		flags |= OCFS2_JOURNAL_DIRTY_FL;
	else
		flags &= ~OCFS2_JOURNAL_DIRTY_FL;
	fe->id1.journal1.ij_flags = cpu_to_le32(flags);

	status = ocfs2_write_block(osb, bh, journal->j_inode);
	if (status < 0)
		mlog_errno(status);

out:
	mlog_exit(status);
	return status;
}

/*
 * If the journal has been kmalloc'd it needs to be freed after this
 * call.
 */
void ocfs2_journal_shutdown(struct ocfs2_super *osb)
{
	struct ocfs2_journal *journal = NULL;
	int status = 0;
	struct inode *inode = NULL;
	int num_running_trans = 0;

	mlog_entry_void();

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	BUG_ON(!osb);
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	journal = osb->journal;
	if (!journal)
		goto done;

	inode = journal->j_inode;

	if (journal->j_state != OCFS2_JOURNAL_LOADED)
		goto done;

	/* need to inc inode use count as journal_destroy will iput. */
	if (!igrab(inode))
		BUG();

	num_running_trans = atomic_read(&(osb->journal->j_num_trans));
	if (num_running_trans > 0)
		mlog(0, "Shutting down journal: must wait on %d "
		     "running transactions!\n",
		     num_running_trans);

	/* Do a commit_cache here. It will flush our journal, *and*
	 * release any locks that are still held.
	 * set the SHUTDOWN flag and release the trans lock.
	 * the commit thread will take the trans lock for us below. */
	journal->j_state = OCFS2_JOURNAL_IN_SHUTDOWN;

	/* The OCFS2_JOURNAL_IN_SHUTDOWN will signal to commit_cache to not
	 * drop the trans_lock (which we want to hold until we
	 * completely destroy the journal. */
	if (osb->commit_task) {
		/* Wait for the commit thread */
		mlog(0, "Waiting for ocfs2commit to exit....\n");
		kthread_stop(osb->commit_task);
		osb->commit_task = NULL;
	}

	BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);

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	if (ocfs2_mount_local(osb)) {
		journal_lock_updates(journal->j_journal);
		status = journal_flush(journal->j_journal);
		journal_unlock_updates(journal->j_journal);
		if (status < 0)
			mlog_errno(status);
	}

	if (status == 0) {
		/*
		 * Do not toggle if flush was unsuccessful otherwise
		 * will leave dirty metadata in a "clean" journal
		 */
		status = ocfs2_journal_toggle_dirty(osb, 0);
		if (status < 0)
			mlog_errno(status);
	}
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	/* Shutdown the kernel journal system */
	journal_destroy(journal->j_journal);

	OCFS2_I(inode)->ip_open_count--;

	/* unlock our journal */
	ocfs2_meta_unlock(inode, 1);

	brelse(journal->j_bh);
	journal->j_bh = NULL;

	journal->j_state = OCFS2_JOURNAL_FREE;

//	up_write(&journal->j_trans_barrier);
done:
	if (inode)
		iput(inode);
	mlog_exit_void();
}

static void ocfs2_clear_journal_error(struct super_block *sb,
				      journal_t *journal,
				      int slot)
{
	int olderr;

	olderr = journal_errno(journal);
	if (olderr) {
		mlog(ML_ERROR, "File system error %d recorded in "
		     "journal %u.\n", olderr, slot);
		mlog(ML_ERROR, "File system on device %s needs checking.\n",
		     sb->s_id);

		journal_ack_err(journal);
		journal_clear_err(journal);
	}
}

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int ocfs2_journal_load(struct ocfs2_journal *journal, int local)
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{
	int status = 0;
	struct ocfs2_super *osb;

	mlog_entry_void();

	if (!journal)
		BUG();

	osb = journal->j_osb;

	status = journal_load(journal->j_journal);
	if (status < 0) {
		mlog(ML_ERROR, "Failed to load journal!\n");
		goto done;
	}

	ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num);

	status = ocfs2_journal_toggle_dirty(osb, 1);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* Launch the commit thread */
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	if (!local) {
		osb->commit_task = kthread_run(ocfs2_commit_thread, osb,
					       "ocfs2cmt");
		if (IS_ERR(osb->commit_task)) {
			status = PTR_ERR(osb->commit_task);
			osb->commit_task = NULL;
			mlog(ML_ERROR, "unable to launch ocfs2commit thread, "
			     "error=%d", status);
			goto done;
		}
	} else
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		osb->commit_task = NULL;

done:
	mlog_exit(status);
	return status;
}


/* 'full' flag tells us whether we clear out all blocks or if we just
 * mark the journal clean */
int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full)
{
	int status;

	mlog_entry_void();

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	BUG_ON(!journal);
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	status = journal_wipe(journal->j_journal, full);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = ocfs2_journal_toggle_dirty(journal->j_osb, 0);
	if (status < 0)
		mlog_errno(status);

bail:
	mlog_exit(status);
	return status;
}

/*
 * JBD Might read a cached version of another nodes journal file. We
 * don't want this as this file changes often and we get no
 * notification on those changes. The only way to be sure that we've
 * got the most up to date version of those blocks then is to force
 * read them off disk. Just searching through the buffer cache won't
 * work as there may be pages backing this file which are still marked
 * up to date. We know things can't change on this file underneath us
 * as we have the lock by now :)
 */
static int ocfs2_force_read_journal(struct inode *inode)
{
	int status = 0;
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	int i;
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	u64 v_blkno, p_blkno, p_blocks, num_blocks;
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#define CONCURRENT_JOURNAL_FILL 32ULL
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	struct buffer_head *bhs[CONCURRENT_JOURNAL_FILL];

	mlog_entry_void();

	memset(bhs, 0, sizeof(struct buffer_head *) * CONCURRENT_JOURNAL_FILL);

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	num_blocks = ocfs2_blocks_for_bytes(inode->i_sb, inode->i_size);
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	v_blkno = 0;
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	while (v_blkno < num_blocks) {
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		status = ocfs2_extent_map_get_blocks(inode, v_blkno,
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						     &p_blkno, &p_blocks, NULL);
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		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		if (p_blocks > CONCURRENT_JOURNAL_FILL)
			p_blocks = CONCURRENT_JOURNAL_FILL;

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		/* We are reading journal data which should not
		 * be put in the uptodate cache */
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		status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
					   p_blkno, p_blocks, bhs, 0,
688
					   NULL);
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		for(i = 0; i < p_blocks; i++) {
			brelse(bhs[i]);
			bhs[i] = NULL;
		}

		v_blkno += p_blocks;
	}

bail:
	for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++)
		if (bhs[i])
			brelse(bhs[i]);
	mlog_exit(status);
	return status;
}

struct ocfs2_la_recovery_item {
	struct list_head	lri_list;
	int			lri_slot;
	struct ocfs2_dinode	*lri_la_dinode;
	struct ocfs2_dinode	*lri_tl_dinode;
};

/* Does the second half of the recovery process. By this point, the
 * node is marked clean and can actually be considered recovered,
 * hence it's no longer in the recovery map, but there's still some
 * cleanup we can do which shouldn't happen within the recovery thread
 * as locking in that context becomes very difficult if we are to take
 * recovering nodes into account.
 *
 * NOTE: This function can and will sleep on recovery of other nodes
 * during cluster locking, just like any other ocfs2 process.
 */
D
David Howells 已提交
727
void ocfs2_complete_recovery(struct work_struct *work)
728 729
{
	int ret;
D
David Howells 已提交
730 731 732
	struct ocfs2_journal *journal =
		container_of(work, struct ocfs2_journal, j_recovery_work);
	struct ocfs2_super *osb = journal->j_osb;
733
	struct ocfs2_dinode *la_dinode, *tl_dinode;
734
	struct ocfs2_la_recovery_item *item, *n;
735 736 737 738 739 740 741 742 743 744
	LIST_HEAD(tmp_la_list);

	mlog_entry_void();

	mlog(0, "completing recovery from keventd\n");

	spin_lock(&journal->j_lock);
	list_splice_init(&journal->j_la_cleanups, &tmp_la_list);
	spin_unlock(&journal->j_lock);

745
	list_for_each_entry_safe(item, n, &tmp_la_list, lri_list) {
746 747 748 749 750 751
		list_del_init(&item->lri_list);

		mlog(0, "Complete recovery for slot %d\n", item->lri_slot);

		la_dinode = item->lri_la_dinode;
		if (la_dinode) {
752
			mlog(0, "Clean up local alloc %llu\n",
753
			     (unsigned long long)le64_to_cpu(la_dinode->i_blkno));
754 755 756 757 758 759 760 761 762 763 764

			ret = ocfs2_complete_local_alloc_recovery(osb,
								  la_dinode);
			if (ret < 0)
				mlog_errno(ret);

			kfree(la_dinode);
		}

		tl_dinode = item->lri_tl_dinode;
		if (tl_dinode) {
765
			mlog(0, "Clean up truncate log %llu\n",
766
			     (unsigned long long)le64_to_cpu(tl_dinode->i_blkno));
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796

			ret = ocfs2_complete_truncate_log_recovery(osb,
								   tl_dinode);
			if (ret < 0)
				mlog_errno(ret);

			kfree(tl_dinode);
		}

		ret = ocfs2_recover_orphans(osb, item->lri_slot);
		if (ret < 0)
			mlog_errno(ret);

		kfree(item);
	}

	mlog(0, "Recovery completion\n");
	mlog_exit_void();
}

/* NOTE: This function always eats your references to la_dinode and
 * tl_dinode, either manually on error, or by passing them to
 * ocfs2_complete_recovery */
static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
					    int slot_num,
					    struct ocfs2_dinode *la_dinode,
					    struct ocfs2_dinode *tl_dinode)
{
	struct ocfs2_la_recovery_item *item;

797
	item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_NOFS);
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
	if (!item) {
		/* Though we wish to avoid it, we are in fact safe in
		 * skipping local alloc cleanup as fsck.ocfs2 is more
		 * than capable of reclaiming unused space. */
		if (la_dinode)
			kfree(la_dinode);

		if (tl_dinode)
			kfree(tl_dinode);

		mlog_errno(-ENOMEM);
		return;
	}

	INIT_LIST_HEAD(&item->lri_list);
	item->lri_la_dinode = la_dinode;
	item->lri_slot = slot_num;
	item->lri_tl_dinode = tl_dinode;

	spin_lock(&journal->j_lock);
	list_add_tail(&item->lri_list, &journal->j_la_cleanups);
	queue_work(ocfs2_wq, &journal->j_recovery_work);
	spin_unlock(&journal->j_lock);
}

/* Called by the mount code to queue recovery the last part of
 * recovery for it's own slot. */
void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
{
	struct ocfs2_journal *journal = osb->journal;

	if (osb->dirty) {
		/* No need to queue up our truncate_log as regular
		 * cleanup will catch that. */
		ocfs2_queue_recovery_completion(journal,
						osb->slot_num,
						osb->local_alloc_copy,
						NULL);
		ocfs2_schedule_truncate_log_flush(osb, 0);

		osb->local_alloc_copy = NULL;
		osb->dirty = 0;
	}
}

static int __ocfs2_recovery_thread(void *arg)
{
	int status, node_num;
	struct ocfs2_super *osb = arg;

	mlog_entry_void();

	status = ocfs2_wait_on_mount(osb);
	if (status < 0) {
		goto bail;
	}

restart:
	status = ocfs2_super_lock(osb, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	while(!ocfs2_node_map_is_empty(osb, &osb->recovery_map)) {
		node_num = ocfs2_node_map_first_set_bit(osb,
							&osb->recovery_map);
		if (node_num == O2NM_INVALID_NODE_NUM) {
			mlog(0, "Out of nodes to recover.\n");
			break;
		}

		status = ocfs2_recover_node(osb, node_num);
		if (status < 0) {
			mlog(ML_ERROR,
			     "Error %d recovering node %d on device (%u,%u)!\n",
			     status, node_num,
			     MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
			mlog(ML_ERROR, "Volume requires unmount.\n");
			continue;
		}

		ocfs2_recovery_map_clear(osb, node_num);
	}
	ocfs2_super_unlock(osb, 1);

	/* We always run recovery on our own orphan dir - the dead
M
Mark Fasheh 已提交
885 886
	 * node(s) may have disallowd a previos inode delete. Re-processing
	 * is therefore required. */
887 888 889 890
	ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
					NULL);

bail:
891
	mutex_lock(&osb->recovery_lock);
892 893
	if (!status &&
	    !ocfs2_node_map_is_empty(osb, &osb->recovery_map)) {
894
		mutex_unlock(&osb->recovery_lock);
895 896 897 898 899 900 901
		goto restart;
	}

	osb->recovery_thread_task = NULL;
	mb(); /* sync with ocfs2_recovery_thread_running */
	wake_up(&osb->recovery_event);

902
	mutex_unlock(&osb->recovery_lock);
903 904 905 906 907 908 909 910 911 912 913 914 915 916

	mlog_exit(status);
	/* no one is callint kthread_stop() for us so the kthread() api
	 * requires that we call do_exit().  And it isn't exported, but
	 * complete_and_exit() seems to be a minimal wrapper around it. */
	complete_and_exit(NULL, status);
	return status;
}

void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num)
{
	mlog_entry("(node_num=%d, osb->node_num = %d)\n",
		   node_num, osb->node_num);

917
	mutex_lock(&osb->recovery_lock);
918 919 920 921 922 923 924 925 926 927 928 929 930 931
	if (osb->disable_recovery)
		goto out;

	/* People waiting on recovery will wait on
	 * the recovery map to empty. */
	if (!ocfs2_recovery_map_set(osb, node_num))
		mlog(0, "node %d already be in recovery.\n", node_num);

	mlog(0, "starting recovery thread...\n");

	if (osb->recovery_thread_task)
		goto out;

	osb->recovery_thread_task =  kthread_run(__ocfs2_recovery_thread, osb,
M
Mark Fasheh 已提交
932
						 "ocfs2rec");
933 934 935 936 937 938
	if (IS_ERR(osb->recovery_thread_task)) {
		mlog_errno((int)PTR_ERR(osb->recovery_thread_task));
		osb->recovery_thread_task = NULL;
	}

out:
939
	mutex_unlock(&osb->recovery_lock);
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
	wake_up(&osb->recovery_event);

	mlog_exit_void();
}

/* Does the actual journal replay and marks the journal inode as
 * clean. Will only replay if the journal inode is marked dirty. */
static int ocfs2_replay_journal(struct ocfs2_super *osb,
				int node_num,
				int slot_num)
{
	int status;
	int got_lock = 0;
	unsigned int flags;
	struct inode *inode = NULL;
	struct ocfs2_dinode *fe;
	journal_t *journal = NULL;
	struct buffer_head *bh = NULL;

	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    slot_num);
	if (inode == NULL) {
		status = -EACCES;
		mlog_errno(status);
		goto done;
	}
	if (is_bad_inode(inode)) {
		status = -EACCES;
		iput(inode);
		inode = NULL;
		mlog_errno(status);
		goto done;
	}
	SET_INODE_JOURNAL(inode);

975
	status = ocfs2_meta_lock_full(inode, &bh, 1, OCFS2_META_LOCK_RECOVERY);
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	if (status < 0) {
		mlog(0, "status returned from ocfs2_meta_lock=%d\n", status);
		if (status != -ERESTARTSYS)
			mlog(ML_ERROR, "Could not lock journal!\n");
		goto done;
	}
	got_lock = 1;

	fe = (struct ocfs2_dinode *) bh->b_data;

	flags = le32_to_cpu(fe->id1.journal1.ij_flags);

	if (!(flags & OCFS2_JOURNAL_DIRTY_FL)) {
		mlog(0, "No recovery required for node %d\n", node_num);
		goto done;
	}

	mlog(ML_NOTICE, "Recovering node %d from slot %d on device (%u,%u)\n",
	     node_num, slot_num,
	     MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));

	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);

	status = ocfs2_force_read_journal(inode);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	mlog(0, "calling journal_init_inode\n");
	journal = journal_init_inode(inode);
	if (journal == NULL) {
		mlog(ML_ERROR, "Linux journal layer error\n");
		status = -EIO;
		goto done;
	}

	status = journal_load(journal);
	if (status < 0) {
		mlog_errno(status);
		if (!igrab(inode))
			BUG();
		journal_destroy(journal);
		goto done;
	}

	ocfs2_clear_journal_error(osb->sb, journal, slot_num);

	/* wipe the journal */
	mlog(0, "flushing the journal.\n");
	journal_lock_updates(journal);
	status = journal_flush(journal);
	journal_unlock_updates(journal);
	if (status < 0)
		mlog_errno(status);

	/* This will mark the node clean */
	flags = le32_to_cpu(fe->id1.journal1.ij_flags);
	flags &= ~OCFS2_JOURNAL_DIRTY_FL;
	fe->id1.journal1.ij_flags = cpu_to_le32(flags);

	status = ocfs2_write_block(osb, bh, inode);
	if (status < 0)
		mlog_errno(status);

	if (!igrab(inode))
		BUG();

	journal_destroy(journal);

done:
	/* drop the lock on this nodes journal */
	if (got_lock)
		ocfs2_meta_unlock(inode, 1);

	if (inode)
		iput(inode);

	if (bh)
		brelse(bh);

	mlog_exit(status);
	return status;
}

/*
 * Do the most important parts of node recovery:
 *  - Replay it's journal
 *  - Stamp a clean local allocator file
 *  - Stamp a clean truncate log
 *  - Mark the node clean
 *
 * If this function completes without error, a node in OCFS2 can be
 * said to have been safely recovered. As a result, failure during the
 * second part of a nodes recovery process (local alloc recovery) is
 * far less concerning.
 */
static int ocfs2_recover_node(struct ocfs2_super *osb,
			      int node_num)
{
	int status = 0;
	int slot_num;
	struct ocfs2_slot_info *si = osb->slot_info;
	struct ocfs2_dinode *la_copy = NULL;
	struct ocfs2_dinode *tl_copy = NULL;

	mlog_entry("(node_num=%d, osb->node_num = %d)\n",
		   node_num, osb->node_num);

	mlog(0, "checking node %d\n", node_num);

	/* Should not ever be called to recover ourselves -- in that
	 * case we should've called ocfs2_journal_load instead. */
1089
	BUG_ON(osb->node_num == node_num);
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163

	slot_num = ocfs2_node_num_to_slot(si, node_num);
	if (slot_num == OCFS2_INVALID_SLOT) {
		status = 0;
		mlog(0, "no slot for this node, so no recovery required.\n");
		goto done;
	}

	mlog(0, "node %d was using slot %d\n", node_num, slot_num);

	status = ocfs2_replay_journal(osb, node_num, slot_num);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* Stamp a clean local alloc file AFTER recovering the journal... */
	status = ocfs2_begin_local_alloc_recovery(osb, slot_num, &la_copy);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* An error from begin_truncate_log_recovery is not
	 * serious enough to warrant halting the rest of
	 * recovery. */
	status = ocfs2_begin_truncate_log_recovery(osb, slot_num, &tl_copy);
	if (status < 0)
		mlog_errno(status);

	/* Likewise, this would be a strange but ultimately not so
	 * harmful place to get an error... */
	ocfs2_clear_slot(si, slot_num);
	status = ocfs2_update_disk_slots(osb, si);
	if (status < 0)
		mlog_errno(status);

	/* This will kfree the memory pointed to by la_copy and tl_copy */
	ocfs2_queue_recovery_completion(osb->journal, slot_num, la_copy,
					tl_copy);

	status = 0;
done:

	mlog_exit(status);
	return status;
}

/* Test node liveness by trylocking his journal. If we get the lock,
 * we drop it here. Return 0 if we got the lock, -EAGAIN if node is
 * still alive (we couldn't get the lock) and < 0 on error. */
static int ocfs2_trylock_journal(struct ocfs2_super *osb,
				 int slot_num)
{
	int status, flags;
	struct inode *inode = NULL;

	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    slot_num);
	if (inode == NULL) {
		mlog(ML_ERROR, "access error\n");
		status = -EACCES;
		goto bail;
	}
	if (is_bad_inode(inode)) {
		mlog(ML_ERROR, "access error (bad inode)\n");
		iput(inode);
		inode = NULL;
		status = -EACCES;
		goto bail;
	}
	SET_INODE_JOURNAL(inode);

	flags = OCFS2_META_LOCK_RECOVERY | OCFS2_META_LOCK_NOQUEUE;
1164
	status = ocfs2_meta_lock_full(inode, NULL, 1, flags);
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
	if (status < 0) {
		if (status != -EAGAIN)
			mlog_errno(status);
		goto bail;
	}

	ocfs2_meta_unlock(inode, 1);
bail:
	if (inode)
		iput(inode);

	return status;
}

/* Call this underneath ocfs2_super_lock. It also assumes that the
 * slot info struct has been updated from disk. */
int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
{
	int status, i, node_num;
	struct ocfs2_slot_info *si = osb->slot_info;

	/* This is called with the super block cluster lock, so we
	 * know that the slot map can't change underneath us. */

	spin_lock(&si->si_lock);
	for(i = 0; i < si->si_num_slots; i++) {
		if (i == osb->slot_num)
			continue;
		if (ocfs2_is_empty_slot(si, i))
			continue;

		node_num = si->si_global_node_nums[i];
		if (ocfs2_node_map_test_bit(osb, &osb->recovery_map, node_num))
			continue;
		spin_unlock(&si->si_lock);

		/* Ok, we have a slot occupied by another node which
		 * is not in the recovery map. We trylock his journal
		 * file here to test if he's alive. */
		status = ocfs2_trylock_journal(osb, i);
		if (!status) {
			/* Since we're called from mount, we know that
			 * the recovery thread can't race us on
			 * setting / checking the recovery bits. */
			ocfs2_recovery_thread(osb, node_num);
		} else if ((status < 0) && (status != -EAGAIN)) {
			mlog_errno(status);
			goto bail;
		}

		spin_lock(&si->si_lock);
	}
	spin_unlock(&si->si_lock);

	status = 0;
bail:
	mlog_exit(status);
	return status;
}

M
Mark Fasheh 已提交
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
struct ocfs2_orphan_filldir_priv {
	struct inode		*head;
	struct ocfs2_super	*osb;
};

static int ocfs2_orphan_filldir(void *priv, const char *name, int name_len,
				loff_t pos, u64 ino, unsigned type)
{
	struct ocfs2_orphan_filldir_priv *p = priv;
	struct inode *iter;

	if (name_len == 1 && !strncmp(".", name, 1))
		return 0;
	if (name_len == 2 && !strncmp("..", name, 2))
		return 0;

	/* Skip bad inodes so that recovery can continue */
	iter = ocfs2_iget(p->osb, ino,
			  OCFS2_FI_FLAG_ORPHAN_RECOVERY);
	if (IS_ERR(iter))
		return 0;

	mlog(0, "queue orphan %llu\n",
	     (unsigned long long)OCFS2_I(iter)->ip_blkno);
	/* No locking is required for the next_orphan queue as there
	 * is only ever a single process doing orphan recovery. */
	OCFS2_I(iter)->ip_next_orphan = p->head;
	p->head = iter;

	return 0;
}

1257 1258 1259
static int ocfs2_queue_orphans(struct ocfs2_super *osb,
			       int slot,
			       struct inode **head)
1260
{
1261
	int status;
1262
	struct inode *orphan_dir_inode = NULL;
M
Mark Fasheh 已提交
1263 1264 1265 1266 1267
	struct ocfs2_orphan_filldir_priv priv;
	loff_t pos = 0;

	priv.osb = osb;
	priv.head = *head;
1268 1269 1270 1271 1272 1273 1274

	orphan_dir_inode = ocfs2_get_system_file_inode(osb,
						       ORPHAN_DIR_SYSTEM_INODE,
						       slot);
	if  (!orphan_dir_inode) {
		status = -ENOENT;
		mlog_errno(status);
1275 1276
		return status;
	}	
1277

1278
	mutex_lock(&orphan_dir_inode->i_mutex);
1279
	status = ocfs2_meta_lock(orphan_dir_inode, NULL, 0);
1280 1281 1282 1283 1284
	if (status < 0) {
		mlog_errno(status);
		goto out;
	}

M
Mark Fasheh 已提交
1285 1286 1287 1288
	status = ocfs2_dir_foreach(orphan_dir_inode, &pos, &priv,
				   ocfs2_orphan_filldir);
	if (status) {
		mlog_errno(status);
1289
		goto out_cluster;
1290 1291
	}

M
Mark Fasheh 已提交
1292 1293
	*head = priv.head;

1294
out_cluster:
1295
	ocfs2_meta_unlock(orphan_dir_inode, 0);
1296 1297
out:
	mutex_unlock(&orphan_dir_inode->i_mutex);
1298
	iput(orphan_dir_inode);
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
	return status;
}

static int ocfs2_orphan_recovery_can_continue(struct ocfs2_super *osb,
					      int slot)
{
	int ret;

	spin_lock(&osb->osb_lock);
	ret = !osb->osb_orphan_wipes[slot];
	spin_unlock(&osb->osb_lock);
	return ret;
}

static void ocfs2_mark_recovering_orphan_dir(struct ocfs2_super *osb,
					     int slot)
{
	spin_lock(&osb->osb_lock);
	/* Mark ourselves such that new processes in delete_inode()
	 * know to quit early. */
	ocfs2_node_map_set_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
	while (osb->osb_orphan_wipes[slot]) {
		/* If any processes are already in the middle of an
		 * orphan wipe on this dir, then we need to wait for
		 * them. */
		spin_unlock(&osb->osb_lock);
		wait_event_interruptible(osb->osb_wipe_event,
					 ocfs2_orphan_recovery_can_continue(osb, slot));
		spin_lock(&osb->osb_lock);
	}
	spin_unlock(&osb->osb_lock);
}

static void ocfs2_clear_recovering_orphan_dir(struct ocfs2_super *osb,
					      int slot)
{
	ocfs2_node_map_clear_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
}

/*
 * Orphan recovery. Each mounted node has it's own orphan dir which we
 * must run during recovery. Our strategy here is to build a list of
 * the inodes in the orphan dir and iget/iput them. The VFS does
 * (most) of the rest of the work.
 *
 * Orphan recovery can happen at any time, not just mount so we have a
 * couple of extra considerations.
 *
 * - We grab as many inodes as we can under the orphan dir lock -
 *   doing iget() outside the orphan dir risks getting a reference on
 *   an invalid inode.
 * - We must be sure not to deadlock with other processes on the
 *   system wanting to run delete_inode(). This can happen when they go
 *   to lock the orphan dir and the orphan recovery process attempts to
 *   iget() inside the orphan dir lock. This can be avoided by
 *   advertising our state to ocfs2_delete_inode().
 */
static int ocfs2_recover_orphans(struct ocfs2_super *osb,
				 int slot)
{
	int ret = 0;
	struct inode *inode = NULL;
	struct inode *iter;
	struct ocfs2_inode_info *oi;

	mlog(0, "Recover inodes from orphan dir in slot %d\n", slot);

	ocfs2_mark_recovering_orphan_dir(osb, slot);
	ret = ocfs2_queue_orphans(osb, slot, &inode);
	ocfs2_clear_recovering_orphan_dir(osb, slot);

	/* Error here should be noted, but we want to continue with as
	 * many queued inodes as we've got. */
	if (ret)
		mlog_errno(ret);
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	while (inode) {
		oi = OCFS2_I(inode);
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		mlog(0, "iput orphan %llu\n", (unsigned long long)oi->ip_blkno);
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		iter = oi->ip_next_orphan;

		spin_lock(&oi->ip_lock);
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Mark Fasheh 已提交
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		/* The remote delete code may have set these on the
		 * assumption that the other node would wipe them
		 * successfully.  If they are still in the node's
		 * orphan dir, we need to reset that state. */
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		oi->ip_flags &= ~(OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE);

		/* Set the proper information to get us going into
		 * ocfs2_delete_inode. */
		oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
		spin_unlock(&oi->ip_lock);

		iput(inode);

		inode = iter;
	}

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	return ret;
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}

static int ocfs2_wait_on_mount(struct ocfs2_super *osb)
{
	/* This check is good because ocfs2 will wait on our recovery
	 * thread before changing it to something other than MOUNTED
	 * or DISABLED. */
	wait_event(osb->osb_mount_event,
		   atomic_read(&osb->vol_state) == VOLUME_MOUNTED ||
		   atomic_read(&osb->vol_state) == VOLUME_DISABLED);

	/* If there's an error on mount, then we may never get to the
	 * MOUNTED flag, but this is set right before
	 * dismount_volume() so we can trust it. */
	if (atomic_read(&osb->vol_state) == VOLUME_DISABLED) {
		mlog(0, "mount error, exiting!\n");
		return -EBUSY;
	}

	return 0;
}

static int ocfs2_commit_thread(void *arg)
{
	int status;
	struct ocfs2_super *osb = arg;
	struct ocfs2_journal *journal = osb->journal;

	/* we can trust j_num_trans here because _should_stop() is only set in
	 * shutdown and nobody other than ourselves should be able to start
	 * transactions.  committing on shutdown might take a few iterations
	 * as final transactions put deleted inodes on the list */
	while (!(kthread_should_stop() &&
		 atomic_read(&journal->j_num_trans) == 0)) {

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		wait_event_interruptible(osb->checkpoint_event,
					 atomic_read(&journal->j_num_trans)
					 || kthread_should_stop());
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		status = ocfs2_commit_cache(osb);
		if (status < 0)
			mlog_errno(status);

		if (kthread_should_stop() && atomic_read(&journal->j_num_trans)){
			mlog(ML_KTHREAD,
			     "commit_thread: %u transactions pending on "
			     "shutdown\n",
			     atomic_read(&journal->j_num_trans));
		}
	}

	return 0;
}

/* Look for a dirty journal without taking any cluster locks. Used for
 * hard readonly access to determine whether the file system journals
 * require recovery. */
int ocfs2_check_journals_nolocks(struct ocfs2_super *osb)
{
	int ret = 0;
	unsigned int slot;
	struct buffer_head *di_bh;
	struct ocfs2_dinode *di;
	struct inode *journal = NULL;

	for(slot = 0; slot < osb->max_slots; slot++) {
		journal = ocfs2_get_system_file_inode(osb,
						      JOURNAL_SYSTEM_INODE,
						      slot);
		if (!journal || is_bad_inode(journal)) {
			ret = -EACCES;
			mlog_errno(ret);
			goto out;
		}

		di_bh = NULL;
		ret = ocfs2_read_block(osb, OCFS2_I(journal)->ip_blkno, &di_bh,
				       0, journal);
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

		di = (struct ocfs2_dinode *) di_bh->b_data;

		if (le32_to_cpu(di->id1.journal1.ij_flags) &
		    OCFS2_JOURNAL_DIRTY_FL)
			ret = -EROFS;

		brelse(di_bh);
		if (ret)
			break;
	}

out:
	if (journal)
		iput(journal);

	return ret;
}