fs/ocfs2/resize.c - kernel/msm-4.19 - Gitiles

 /* -*- mode: c; c-basic-offset: 8; -*-
  * vim: noexpandtab sw=8 ts=8 sts=0:
  *
  * resize.c
  *
  * volume resize.
  * Inspired by ext3/resize.c.
  *
  * Copyright (C) 2007 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>

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

 #include "ocfs2.h"

 #include "alloc.h"
 #include "dlmglue.h"
 #include "inode.h"
 #include "journal.h"
 #include "super.h"
 #include "sysfile.h"
 #include "uptodate.h"

 #include "buffer_head_io.h"
 #include "suballoc.h"
 #include "resize.h"

 /*
  * Check whether there are new backup superblocks exist
  * in the last group. If there are some, mark them or clear
  * them in the bitmap.
  *
  * Return how many backups we find in the last group.
  */
 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
 				       struct ocfs2_group_desc *gd,
 				       int new_clusters,
 				       u32 first_new_cluster,
 				       u16 cl_cpg,
 				       int set)
 {
 	int i;
 	u16 backups = 0;
 	u32 cluster;
 	u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);

 	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 		blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 		cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);

 		gd_blkno = ocfs2_which_cluster_group(inode, cluster);
 		if (gd_blkno < lgd_blkno)
 			continue;
 		else if (gd_blkno > lgd_blkno)
 			break;

 		if (set)
 			ocfs2_set_bit(cluster % cl_cpg,
 				      (unsigned long *)gd->bg_bitmap);
 		else
 			ocfs2_clear_bit(cluster % cl_cpg,
 					(unsigned long *)gd->bg_bitmap);
 		backups++;
 	}

 	mlog_exit_void();
 	return backups;
 }

 static int ocfs2_update_last_group_and_inode(handle_t *handle,
 					     struct inode *bm_inode,
 					     struct buffer_head *bm_bh,
 					     struct buffer_head *group_bh,
 					     u32 first_new_cluster,
 					     int new_clusters)
 {
 	int ret = 0;
 	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
 	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
 	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
 	struct ocfs2_chain_rec *cr;
 	struct ocfs2_group_desc *group;
 	u16 chain, num_bits, backups = 0;
 	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
 	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);

 	mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
 		   new_clusters, first_new_cluster);

 	ret = ocfs2_journal_access(handle, bm_inode, group_bh,
 				   OCFS2_JOURNAL_ACCESS_WRITE);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out;
 	}

 	group = (struct ocfs2_group_desc *)group_bh->b_data;

 	/* update the group first. */
 	num_bits = new_clusters * cl_bpc;
 	le16_add_cpu(&group->bg_bits, num_bits);
 	le16_add_cpu(&group->bg_free_bits_count, num_bits);

 	/*
 	 * check whether there are some new backup superblocks exist in
 	 * this group and update the group bitmap accordingly.
 	 */
 	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
 				     OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
 		backups = ocfs2_calc_new_backup_super(bm_inode,
 						     group,
 						     new_clusters,
 						     first_new_cluster,
 						     cl_cpg, 1);
 		le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
 	}

 	ret = ocfs2_journal_dirty(handle, group_bh);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out_rollback;
 	}

 	/* update the inode accordingly. */
 	ret = ocfs2_journal_access(handle, bm_inode, bm_bh,
 				   OCFS2_JOURNAL_ACCESS_WRITE);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out_rollback;
 	}

 	chain = le16_to_cpu(group->bg_chain);
 	cr = (&cl->cl_recs[chain]);
 	le32_add_cpu(&cr->c_total, num_bits);
 	le32_add_cpu(&cr->c_free, num_bits);
 	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
 	le32_add_cpu(&fe->i_clusters, new_clusters);

 	if (backups) {
 		le32_add_cpu(&cr->c_free, -1 * backups);
 		le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
 	}

 	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
 	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 	le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
 	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
 	i_size_write(bm_inode, le64_to_cpu(fe->i_size));

 	ocfs2_journal_dirty(handle, bm_bh);

 out_rollback:
 	if (ret < 0) {
 		ocfs2_calc_new_backup_super(bm_inode,
 					    group,
 					    new_clusters,
 					    first_new_cluster,
 					    cl_cpg, 0);
 		le16_add_cpu(&group->bg_free_bits_count, backups);
 		le16_add_cpu(&group->bg_bits, -1 * num_bits);
 		le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 	}
 out:
 	mlog_exit(ret);
 	return ret;
 }

 static int update_backups(struct inode * inode, u32 clusters, char *data)
 {
 	int i, ret = 0;
 	u32 cluster;
 	u64 blkno;
 	struct buffer_head *backup = NULL;
 	struct ocfs2_dinode *backup_di = NULL;
 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

 	/* calculate the real backups we need to update. */
 	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 		blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 		cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 		if (cluster > clusters)
 			break;

 		ret = ocfs2_read_block(osb, blkno, &backup, 0, NULL);
 		if (ret < 0) {
 			mlog_errno(ret);
 			break;
 		}

 		memcpy(backup->b_data, data, inode->i_sb->s_blocksize);

 		backup_di = (struct ocfs2_dinode *)backup->b_data;
 		backup_di->i_blkno = cpu_to_le64(blkno);

 		ret = ocfs2_write_super_or_backup(osb, backup);
 		brelse(backup);
 		backup = NULL;
 		if (ret < 0) {
 			mlog_errno(ret);
 			break;
 		}
 	}

 	return ret;
 }

 static void ocfs2_update_super_and_backups(struct inode *inode,
 					   int new_clusters)
 {
 	int ret;
 	u32 clusters = 0;
 	struct buffer_head *super_bh = NULL;
 	struct ocfs2_dinode *super_di = NULL;
 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

 	/*
 	 * update the superblock last.
 	 * It doesn't matter if the write failed.
 	 */
 	ret = ocfs2_read_block(osb, OCFS2_SUPER_BLOCK_BLKNO,
 			       &super_bh, 0, NULL);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out;
 	}

 	super_di = (struct ocfs2_dinode *)super_bh->b_data;
 	le32_add_cpu(&super_di->i_clusters, new_clusters);
 	clusters = le32_to_cpu(super_di->i_clusters);

 	ret = ocfs2_write_super_or_backup(osb, super_bh);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out;
 	}

 	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 		ret = update_backups(inode, clusters, super_bh->b_data);

 out:
 	if (super_bh)
 		brelse(super_bh);
 	if (ret)
 		printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 			" during fs resize. This condition is not fatal,"
 			" but fsck.ocfs2 should be run to fix it\n",
 			osb->dev_str);
 	return;
 }

 /*
  * Extend the filesystem to the new number of clusters specified.  This entry
  * point is only used to extend the current filesystem to the end of the last
  * existing group.
  */
 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 {
 	int ret;
 	handle_t *handle;
 	struct buffer_head *main_bm_bh = NULL;
 	struct buffer_head *group_bh = NULL;
 	struct inode *main_bm_inode = NULL;
 	struct ocfs2_dinode *fe = NULL;
 	struct ocfs2_group_desc *group = NULL;
 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 	u16 cl_bpc;
 	u32 first_new_cluster;
 	u64 lgd_blkno;

 	mlog_entry_void();

 	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 		return -EROFS;

 	if (new_clusters < 0)
 		return -EINVAL;
 	else if (new_clusters == 0)
 		return 0;

 	main_bm_inode = ocfs2_get_system_file_inode(osb,
 						    GLOBAL_BITMAP_SYSTEM_INODE,
 						    OCFS2_INVALID_SLOT);
 	if (!main_bm_inode) {
 		ret = -EINVAL;
 		mlog_errno(ret);
 		goto out;
 	}

 	mutex_lock(&main_bm_inode->i_mutex);

 	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out_mutex;
 	}

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

 	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 				 ocfs2_group_bitmap_size(osb->sb) * 8) {
 		mlog(ML_ERROR, "The disk is too old and small. "
 		     "Force to do offline resize.");
 		ret = -EINVAL;
 		goto out_unlock;
 	}

 	if (!OCFS2_IS_VALID_DINODE(fe)) {
 		OCFS2_RO_ON_INVALID_DINODE(main_bm_inode->i_sb, fe);
 		ret = -EIO;
 		goto out_unlock;
 	}

 	first_new_cluster = le32_to_cpu(fe->i_clusters);
 	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 					      first_new_cluster - 1);

 	ret = ocfs2_read_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
 			       main_bm_inode);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out_unlock;
 	}

 	group = (struct ocfs2_group_desc *)group_bh->b_data;

 	ret = ocfs2_check_group_descriptor(inode->i_sb, fe, group);
 	if (ret) {
 		mlog_errno(ret);
 		goto out_unlock;
 	}

 	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 		le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 		ret = -EINVAL;
 		goto out_unlock;
 	}

 	mlog(0, "extend the last group at %llu, new clusters = %d\n",
 	     le64_to_cpu(group->bg_blkno), new_clusters);

 	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 	if (IS_ERR(handle)) {
 		mlog_errno(PTR_ERR(handle));
 		ret = -EINVAL;
 		goto out_unlock;
 	}

 	/* update the last group descriptor and inode. */
 	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 						main_bm_bh, group_bh,
 						first_new_cluster,
 						new_clusters);
 	if (ret) {
 		mlog_errno(ret);
 		goto out_commit;
 	}

 	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);

 out_commit:
 	ocfs2_commit_trans(osb, handle);
 out_unlock:
 	if (group_bh)
 		brelse(group_bh);

 	if (main_bm_bh)
 		brelse(main_bm_bh);

 	ocfs2_inode_unlock(main_bm_inode, 1);

 out_mutex:
 	mutex_unlock(&main_bm_inode->i_mutex);
 	iput(main_bm_inode);

 out:
 	mlog_exit_void();
 	return ret;
 }
	/* -- mode: c; c-basic-offset: 8; --
	* vim: noexpandtab sw=8 ts=8 sts=0:
	*
	* resize.c
	*
	* volume resize.
	* Inspired by ext3/resize.c.
	*
	* Copyright (C) 2007 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>

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

	#include "ocfs2.h"

	#include "alloc.h"
	#include "dlmglue.h"
	#include "inode.h"
	#include "journal.h"
	#include "super.h"
	#include "sysfile.h"
	#include "uptodate.h"

	#include "buffer_head_io.h"
	#include "suballoc.h"
	#include "resize.h"

	/*
	* Check whether there are new backup superblocks exist
	* in the last group. If there are some, mark them or clear
	* them in the bitmap.
	*
	* Return how many backups we find in the last group.
	*/
	static u16 ocfs2_calc_new_backup_super(struct inode *inode,
	struct ocfs2_group_desc *gd,
	int new_clusters,
	u32 first_new_cluster,
	u16 cl_cpg,
	int set)
	{
	int i;
	u16 backups = 0;
	u32 cluster;
	u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);

	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);

	gd_blkno = ocfs2_which_cluster_group(inode, cluster);
	if (gd_blkno < lgd_blkno)
	continue;
	else if (gd_blkno > lgd_blkno)
	break;

	if (set)
	ocfs2_set_bit(cluster % cl_cpg,
	(unsigned long *)gd->bg_bitmap);
	else
	ocfs2_clear_bit(cluster % cl_cpg,
	(unsigned long *)gd->bg_bitmap);
	backups++;
	}

	mlog_exit_void();
	return backups;
	}

	static int ocfs2_update_last_group_and_inode(handle_t *handle,
	struct inode *bm_inode,
	struct buffer_head *bm_bh,
	struct buffer_head *group_bh,
	u32 first_new_cluster,
	int new_clusters)
	{
	int ret = 0;
	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
	struct ocfs2_dinode fe = (struct ocfs2_dinode ) bm_bh->b_data;
	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
	struct ocfs2_chain_rec *cr;
	struct ocfs2_group_desc *group;
	u16 chain, num_bits, backups = 0;
	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);

	mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
	new_clusters, first_new_cluster);

	ret = ocfs2_journal_access(handle, bm_inode, group_bh,
	OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
	mlog_errno(ret);
	goto out;
	}

	group = (struct ocfs2_group_desc *)group_bh->b_data;

	/* update the group first. */
	num_bits = new_clusters * cl_bpc;
	le16_add_cpu(&group->bg_bits, num_bits);
	le16_add_cpu(&group->bg_free_bits_count, num_bits);

	/*
	* check whether there are some new backup superblocks exist in
	* this group and update the group bitmap accordingly.
	*/
	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
	OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
	backups = ocfs2_calc_new_backup_super(bm_inode,
	group,
	new_clusters,
	first_new_cluster,
	cl_cpg, 1);
	le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	}

	ret = ocfs2_journal_dirty(handle, group_bh);
	if (ret < 0) {
	mlog_errno(ret);
	goto out_rollback;
	}

	/* update the inode accordingly. */
	ret = ocfs2_journal_access(handle, bm_inode, bm_bh,
	OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
	mlog_errno(ret);
	goto out_rollback;
	}

	chain = le16_to_cpu(group->bg_chain);
	cr = (&cl->cl_recs[chain]);
	le32_add_cpu(&cr->c_total, num_bits);
	le32_add_cpu(&cr->c_free, num_bits);
	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	le32_add_cpu(&fe->i_clusters, new_clusters);

	if (backups) {
	le32_add_cpu(&cr->c_free, -1 * backups);
	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	}

	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	i_size_write(bm_inode, le64_to_cpu(fe->i_size));

	ocfs2_journal_dirty(handle, bm_bh);

	out_rollback:
	if (ret < 0) {
	ocfs2_calc_new_backup_super(bm_inode,
	group,
	new_clusters,
	first_new_cluster,
	cl_cpg, 0);
	le16_add_cpu(&group->bg_free_bits_count, backups);
	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
	}
	out:
	mlog_exit(ret);
	return ret;
	}

	static int update_backups(struct inode * inode, u32 clusters, char *data)
	{
	int i, ret = 0;
	u32 cluster;
	u64 blkno;
	struct buffer_head *backup = NULL;
	struct ocfs2_dinode *backup_di = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	/* calculate the real backups we need to update. */
	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
	if (cluster > clusters)
	break;

	ret = ocfs2_read_block(osb, blkno, &backup, 0, NULL);
	if (ret < 0) {
	mlog_errno(ret);
	break;
	}

	memcpy(backup->b_data, data, inode->i_sb->s_blocksize);

	backup_di = (struct ocfs2_dinode *)backup->b_data;
	backup_di->i_blkno = cpu_to_le64(blkno);

	ret = ocfs2_write_super_or_backup(osb, backup);
	brelse(backup);
	backup = NULL;
	if (ret < 0) {
	mlog_errno(ret);
	break;
	}
	}

	return ret;
	}

	static void ocfs2_update_super_and_backups(struct inode *inode,
	int new_clusters)
	{
	int ret;
	u32 clusters = 0;
	struct buffer_head *super_bh = NULL;
	struct ocfs2_dinode *super_di = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	/*
	* update the superblock last.
	* It doesn't matter if the write failed.
	*/
	ret = ocfs2_read_block(osb, OCFS2_SUPER_BLOCK_BLKNO,
	&super_bh, 0, NULL);
	if (ret < 0) {
	mlog_errno(ret);
	goto out;
	}

	super_di = (struct ocfs2_dinode *)super_bh->b_data;
	le32_add_cpu(&super_di->i_clusters, new_clusters);
	clusters = le32_to_cpu(super_di->i_clusters);

	ret = ocfs2_write_super_or_backup(osb, super_bh);
	if (ret < 0) {
	mlog_errno(ret);
	goto out;
	}

	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
	ret = update_backups(inode, clusters, super_bh->b_data);

	out:
	if (super_bh)
	brelse(super_bh);
	if (ret)
	printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
	" during fs resize. This condition is not fatal,"
	" but fsck.ocfs2 should be run to fix it\n",
	osb->dev_str);
	return;
	}

	/*
	* Extend the filesystem to the new number of clusters specified. This entry
	* point is only used to extend the current filesystem to the end of the last
	* existing group.
	*/
	int ocfs2_group_extend(struct inode * inode, int new_clusters)
	{
	int ret;
	handle_t *handle;
	struct buffer_head *main_bm_bh = NULL;
	struct buffer_head *group_bh = NULL;
	struct inode *main_bm_inode = NULL;
	struct ocfs2_dinode *fe = NULL;
	struct ocfs2_group_desc *group = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	u16 cl_bpc;
	u32 first_new_cluster;
	u64 lgd_blkno;

	mlog_entry_void();

	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	return -EROFS;

	if (new_clusters < 0)
	return -EINVAL;
	else if (new_clusters == 0)
	return 0;

	main_bm_inode = ocfs2_get_system_file_inode(osb,
	GLOBAL_BITMAP_SYSTEM_INODE,
	OCFS2_INVALID_SLOT);
	if (!main_bm_inode) {
	ret = -EINVAL;
	mlog_errno(ret);
	goto out;
	}

	mutex_lock(&main_bm_inode->i_mutex);

	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	if (ret < 0) {
	mlog_errno(ret);
	goto out_mutex;
	}

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

	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
	ocfs2_group_bitmap_size(osb->sb) * 8) {
	mlog(ML_ERROR, "The disk is too old and small. "
	"Force to do offline resize.");
	ret = -EINVAL;
	goto out_unlock;
	}

	if (!OCFS2_IS_VALID_DINODE(fe)) {
	OCFS2_RO_ON_INVALID_DINODE(main_bm_inode->i_sb, fe);
	ret = -EIO;
	goto out_unlock;
	}

	first_new_cluster = le32_to_cpu(fe->i_clusters);
	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	first_new_cluster - 1);

	ret = ocfs2_read_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
	main_bm_inode);
	if (ret < 0) {
	mlog_errno(ret);
	goto out_unlock;
	}

	group = (struct ocfs2_group_desc *)group_bh->b_data;

	ret = ocfs2_check_group_descriptor(inode->i_sb, fe, group);
	if (ret) {
	mlog_errno(ret);
	goto out_unlock;
	}

	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	ret = -EINVAL;
	goto out_unlock;
	}

	mlog(0, "extend the last group at %llu, new clusters = %d\n",
	le64_to_cpu(group->bg_blkno), new_clusters);

	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	if (IS_ERR(handle)) {
	mlog_errno(PTR_ERR(handle));
	ret = -EINVAL;
	goto out_unlock;
	}

	/* update the last group descriptor and inode. */
	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	main_bm_bh, group_bh,
	first_new_cluster,
	new_clusters);
	if (ret) {
	mlog_errno(ret);
	goto out_commit;
	}

	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);

	out_commit:
	ocfs2_commit_trans(osb, handle);
	out_unlock:
	if (group_bh)
	brelse(group_bh);

	if (main_bm_bh)
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

	out_mutex:
	mutex_unlock(&main_bm_inode->i_mutex);
	iput(main_bm_inode);

	out:
	mlog_exit_void();
	return ret;
	}