[linux-2.6-block.git] / fs / ocfs2 / resize.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- 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.
 */

#include <linux/fs.h>
#include <linux/types.h>

#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 "ocfs2_trace.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,
				       u16 cl_cpg,
				       u16 old_bg_clusters,
				       int set)
{
	int i;
	u16 backups = 0;
	u32 cluster, lgd_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;

		/* check if already done backup super */
		lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
		lgd_cluster += old_bg_clusters;
		if (lgd_cluster >= cluster)
			continue;

		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++;
	}

	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);
	u16 old_bg_clusters;

	trace_ocfs2_update_last_group_and_inode(new_clusters,
						first_new_cluster);

	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(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;

	old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
	/* 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,
						     cl_cpg, old_bg_clusters, 1);
		le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	}

	ocfs2_journal_dirty(handle, group_bh);

	/* update the inode accordingly. */
	ret = ocfs2_journal_access_di(handle, INODE_CACHE(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, (u64)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,
					    cl_cpg, old_bg_clusters, 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:
	if (ret)
		mlog_errno(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_blocks_sync(osb, blkno, 1, &backup);
		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_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
				     &super_bh);
	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:
	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;

	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;
	}

	inode_lock(main_bm_inode);

	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;

	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	 * so any corruption is a code bug. */
	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));

	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
		ocfs2_group_bitmap_size(osb->sb, 0,
					osb->s_feature_incompat) * 8) {
		mlog(ML_ERROR, "The disk is too old and small. "
		     "Force to do offline resize.");
		ret = -EINVAL;
		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_group_descriptor(main_bm_inode, fe, lgd_blkno,
					  &group_bh);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}
	group = (struct ocfs2_group_desc *)group_bh->b_data;

	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;
	}


	trace_ocfs2_group_extend(
	     (unsigned long long)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:
	brelse(group_bh);
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	inode_unlock(main_bm_inode);
	iput(main_bm_inode);

out:
	return ret;
}

static int ocfs2_check_new_group(struct inode *inode,
				 struct ocfs2_dinode *di,
				 struct ocfs2_new_group_input *input,
				 struct buffer_head *group_bh)
{
	int ret;
	struct ocfs2_group_desc *gd =
		(struct ocfs2_group_desc *)group_bh->b_data;
	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);

	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
	if (ret)
		goto out;

	ret = -EINVAL;
	if (le16_to_cpu(gd->bg_chain) != input->chain)
		mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
		     "while input has %u set.\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_chain), input->chain);
	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
		mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
		     "input has %u clusters set\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits), input->clusters);
	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
		mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
		     "but it should have %u set\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits),
		     input->frees * cl_bpc);
	else
		ret = 0;

out:
	return ret;
}

static int ocfs2_verify_group_and_input(struct inode *inode,
					struct ocfs2_dinode *di,
					struct ocfs2_new_group_input *input,
					struct buffer_head *group_bh)
{
	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	u32 total_clusters = le32_to_cpu(di->i_clusters);
	int ret = -EINVAL;

	if (cluster < total_clusters)
		mlog(ML_ERROR, "add a group which is in the current volume.\n");
	else if (input->chain >= cl_count)
		mlog(ML_ERROR, "input chain exceeds the limit.\n");
	else if (next_free != cl_count && next_free != input->chain)
		mlog(ML_ERROR,
		     "the add group should be in chain %u\n", next_free);
	else if (total_clusters + input->clusters < total_clusters)
		mlog(ML_ERROR, "add group's clusters overflow.\n");
	else if (input->clusters > cl_cpg)
		mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	else if (input->frees > input->clusters)
		mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	else if (total_clusters % cl_cpg != 0)
		mlog(ML_ERROR,
		     "the last group isn't full. Use group extend first.\n");
	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
		mlog(ML_ERROR, "group blkno is invalid\n");
	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
		mlog(ML_ERROR, "group descriptor check failed.\n");
	else
		ret = 0;

	return ret;
}

/* Add a new group descriptor to global_bitmap. */
int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
{
	int ret;
	handle_t *handle;
	struct buffer_head *main_bm_bh = NULL;
	struct inode *main_bm_inode = NULL;
	struct ocfs2_dinode *fe = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *group_bh = NULL;
	struct ocfs2_group_desc *group = NULL;
	struct ocfs2_chain_list *cl;
	struct ocfs2_chain_rec *cr;
	u16 cl_bpc;
	u64 bg_ptr;

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

	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;
	}

	inode_lock(main_bm_inode);

	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, 0,
					osb->s_feature_incompat) * 8) {
		mlog(ML_ERROR, "The disk is too old and small."
		     " Force to do offline resize.");
		ret = -EINVAL;
		goto out_unlock;
	}

	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
	if (ret < 0) {
		mlog(ML_ERROR, "Can't read the group descriptor # %llu "
		     "from the device.", (unsigned long long)input->group);
		goto out_unlock;
	}

	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);

	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	if (ret) {
		mlog_errno(ret);
		goto out_free_group_bh;
	}

	trace_ocfs2_group_add((unsigned long long)input->group,
			       input->chain, input->clusters, input->frees);

	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	if (IS_ERR(handle)) {
		mlog_errno(PTR_ERR(handle));
		ret = -EINVAL;
		goto out_free_group_bh;
	}

	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	cl = &fe->id2.i_chain;
	cr = &cl->cl_recs[input->chain];

	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
				      group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_commit;
	}

	group = (struct ocfs2_group_desc *)group_bh->b_data;
	bg_ptr = le64_to_cpu(group->bg_next_group);
	group->bg_next_group = cr->c_blkno;
	ocfs2_journal_dirty(handle, group_bh);

	ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
				      main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		group->bg_next_group = cpu_to_le64(bg_ptr);
		mlog_errno(ret);
		goto out_commit;
	}

	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
		le16_add_cpu(&cl->cl_next_free_rec, 1);
		memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	}

	cr->c_blkno = cpu_to_le64(input->group);
	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);

	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	le32_add_cpu(&fe->id1.bitmap1.i_used,
		     (input->clusters - input->frees) * cl_bpc);
	le32_add_cpu(&fe->i_clusters, input->clusters);

	ocfs2_journal_dirty(handle, main_bm_bh);

	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));

	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);

out_commit:
	ocfs2_commit_trans(osb, handle);

out_free_group_bh:
	brelse(group_bh);

out_unlock:
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	inode_unlock(main_bm_inode);
	iput(main_bm_inode);

out:
	return ret;
}
Commit	Line	Data
328970de	1	// SPDX-License-Identifier: GPL-2.0-or-later
d659072f TM	2	/* -- mode: c; c-basic-offset: 8; --
	3	* vim: noexpandtab sw=8 ts=8 sts=0:
	4	*
	5	* resize.c
	6	*
	7	* volume resize.
	8	* Inspired by ext3/resize.c.
	9	*
	10	* Copyright (C) 2007 Oracle. All rights reserved.
d659072f TM	11	*/
	12
	13	#include <linux/fs.h>
	14	#include <linux/types.h>
	15
d659072f TM	16	#include <cluster/masklog.h>
	17
	18	#include "ocfs2.h"
	19
	20	#include "alloc.h"
	21	#include "dlmglue.h"
	22	#include "inode.h"
	23	#include "journal.h"
	24	#include "super.h"
	25	#include "sysfile.h"
	26	#include "uptodate.h"
a5438702	27	#include "ocfs2_trace.h"
d659072f TM	28
	29	#include "buffer_head_io.h"
	30	#include "suballoc.h"
	31	#include "resize.h"
	32
	33	/*
	34	* Check whether there are new backup superblocks exist
	35	* in the last group. If there are some, mark them or clear
	36	* them in the bitmap.
	37	*
	38	* Return how many backups we find in the last group.
	39	*/
	40	static u16 ocfs2_calc_new_backup_super(struct inode *inode,
	41	struct ocfs2_group_desc *gd,
d659072f	42	u16 cl_cpg,
5c9ee4cb	43	u16 old_bg_clusters,
d659072f TM	44	int set)
	45	{
	46	int i;
	47	u16 backups = 0;
5c9ee4cb	48	u32 cluster, lgd_cluster;
d659072f TM	49	u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
	50
	51	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	52	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	53	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
	54
	55	gd_blkno = ocfs2_which_cluster_group(inode, cluster);
	56	if (gd_blkno < lgd_blkno)
	57	continue;
	58	else if (gd_blkno > lgd_blkno)
	59	break;
	60
5c9ee4cb JQ	61	/* check if already done backup super */
	62	lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
	63	lgd_cluster += old_bg_clusters;
	64	if (lgd_cluster >= cluster)
	65	continue;
	66
d659072f TM	67	if (set)
	68	ocfs2_set_bit(cluster % cl_cpg,
	69	(unsigned long *)gd->bg_bitmap);
	70	else
	71	ocfs2_clear_bit(cluster % cl_cpg,
	72	(unsigned long *)gd->bg_bitmap);
	73	backups++;
	74	}
	75
d659072f TM	76	return backups;
	77	}
	78
	79	static int ocfs2_update_last_group_and_inode(handle_t *handle,
	80	struct inode *bm_inode,
	81	struct buffer_head *bm_bh,
	82	struct buffer_head *group_bh,
	83	u32 first_new_cluster,
	84	int new_clusters)
	85	{
	86	int ret = 0;
	87	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
	88	struct ocfs2_dinode fe = (struct ocfs2_dinode ) bm_bh->b_data;
	89	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
	90	struct ocfs2_chain_rec *cr;
	91	struct ocfs2_group_desc *group;
	92	u16 chain, num_bits, backups = 0;
	93	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
	94	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
5c9ee4cb	95	u16 old_bg_clusters;
d659072f	96
a5438702 TM	97	trace_ocfs2_update_last_group_and_inode(new_clusters,
a5438702 TM	98	first_new_cluster);
d659072f	99
0cf2f763 JB	100	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
0cf2f763 JB	101	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	102	if (ret < 0) {
	103	mlog_errno(ret);
	104	goto out;
	105	}
	106
	107	group = (struct ocfs2_group_desc *)group_bh->b_data;
	108
5c9ee4cb	109	old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
d659072f TM	110	/* update the group first. */
	111	num_bits = new_clusters * cl_bpc;
	112	le16_add_cpu(&group->bg_bits, num_bits);
	113	le16_add_cpu(&group->bg_free_bits_count, num_bits);
	114
	115	/*
	116	* check whether there are some new backup superblocks exist in
	117	* this group and update the group bitmap accordingly.
	118	*/
	119	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
	120	OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
	121	backups = ocfs2_calc_new_backup_super(bm_inode,
	122	group,
5c9ee4cb	123	cl_cpg, old_bg_clusters, 1);
d659072f TM	124	le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	125	}
	126
ec20cec7	127	ocfs2_journal_dirty(handle, group_bh);
d659072f TM	128
d659072f TM	129	/* update the inode accordingly. */
0cf2f763	130	ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
13723d00	131	OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	132	if (ret < 0) {
	133	mlog_errno(ret);
	134	goto out_rollback;
	135	}
	136
	137	chain = le16_to_cpu(group->bg_chain);
	138	cr = (&cl->cl_recs[chain]);
	139	le32_add_cpu(&cr->c_total, num_bits);
	140	le32_add_cpu(&cr->c_free, num_bits);
	141	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	142	le32_add_cpu(&fe->i_clusters, new_clusters);
	143
	144	if (backups) {
	145	le32_add_cpu(&cr->c_free, -1 * backups);
	146	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	147	}
	148
	149	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	150	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
17bf1418	151	le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
d659072f TM	152	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	153	i_size_write(bm_inode, le64_to_cpu(fe->i_size));
	154
	155	ocfs2_journal_dirty(handle, bm_bh);
	156
	157	out_rollback:
	158	if (ret < 0) {
	159	ocfs2_calc_new_backup_super(bm_inode,
	160	group,
5c9ee4cb	161	cl_cpg, old_bg_clusters, 0);
d659072f TM	162	le16_add_cpu(&group->bg_free_bits_count, backups);
	163	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	164	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
	165	}
	166	out:
c1e8d35e TM	167	if (ret)
c1e8d35e TM	168	mlog_errno(ret);
d659072f TM	169	return ret;
	170	}
	171
	172	static int update_backups(struct inode * inode, u32 clusters, char *data)
	173	{
	174	int i, ret = 0;
	175	u32 cluster;
	176	u64 blkno;
	177	struct buffer_head *backup = NULL;
	178	struct ocfs2_dinode *backup_di = NULL;
	179	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	180
	181	/* calculate the real backups we need to update. */
	182	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	183	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	184	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
584dca34	185	if (cluster >= clusters)
d659072f TM	186	break;
d659072f TM	187
da1e9098	188	ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
d659072f TM	189	if (ret < 0) {
	190	mlog_errno(ret);
	191	break;
	192	}
	193
	194	memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
	195
	196	backup_di = (struct ocfs2_dinode *)backup->b_data;
	197	backup_di->i_blkno = cpu_to_le64(blkno);
	198
	199	ret = ocfs2_write_super_or_backup(osb, backup);
	200	brelse(backup);
	201	backup = NULL;
	202	if (ret < 0) {
	203	mlog_errno(ret);
	204	break;
	205	}
	206	}
	207
	208	return ret;
	209	}
	210
	211	static void ocfs2_update_super_and_backups(struct inode *inode,
	212	int new_clusters)
	213	{
	214	int ret;
	215	u32 clusters = 0;
	216	struct buffer_head *super_bh = NULL;
	217	struct ocfs2_dinode *super_di = NULL;
	218	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	219
	220	/*
	221	* update the superblock last.
	222	* It doesn't matter if the write failed.
	223	*/
da1e9098 JB	224	ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
da1e9098 JB	225	&super_bh);
d659072f TM	226	if (ret < 0) {
	227	mlog_errno(ret);
	228	goto out;
	229	}
	230
	231	super_di = (struct ocfs2_dinode *)super_bh->b_data;
	232	le32_add_cpu(&super_di->i_clusters, new_clusters);
	233	clusters = le32_to_cpu(super_di->i_clusters);
	234
	235	ret = ocfs2_write_super_or_backup(osb, super_bh);
	236	if (ret < 0) {
	237	mlog_errno(ret);
	238	goto out;
	239	}
	240
	241	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
	242	ret = update_backups(inode, clusters, super_bh->b_data);
	243
	244	out:
2fe5c1d7	245	brelse(super_bh);
d659072f TM	246	if (ret)
	247	printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
	248	" during fs resize. This condition is not fatal,"
	249	" but fsck.ocfs2 should be run to fix it\n",
	250	osb->dev_str);
	251	return;
	252	}
	253
	254	/*
	255	* Extend the filesystem to the new number of clusters specified. This entry
	256	* point is only used to extend the current filesystem to the end of the last
	257	* existing group.
	258	*/
	259	int ocfs2_group_extend(struct inode * inode, int new_clusters)
	260	{
	261	int ret;
	262	handle_t *handle;
	263	struct buffer_head *main_bm_bh = NULL;
	264	struct buffer_head *group_bh = NULL;
	265	struct inode *main_bm_inode = NULL;
	266	struct ocfs2_dinode *fe = NULL;
	267	struct ocfs2_group_desc *group = NULL;
	268	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	269	u16 cl_bpc;
	270	u32 first_new_cluster;
	271	u64 lgd_blkno;
	272
d659072f TM	273	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	274	return -EROFS;
	275
	276	if (new_clusters < 0)
	277	return -EINVAL;
	278	else if (new_clusters == 0)
	279	return 0;
	280
	281	main_bm_inode = ocfs2_get_system_file_inode(osb,
	282	GLOBAL_BITMAP_SYSTEM_INODE,
	283	OCFS2_INVALID_SLOT);
	284	if (!main_bm_inode) {
	285	ret = -EINVAL;
	286	mlog_errno(ret);
	287	goto out;
	288	}
	289
5955102c	290	inode_lock(main_bm_inode);
d659072f TM	291
	292	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	293	if (ret < 0) {
	294	mlog_errno(ret);
	295	goto out_mutex;
	296	}
	297
	298	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	299
10995aa2 JB	300	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	301	* so any corruption is a code bug. */
	302	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
	303
d659072f	304	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	305	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	306	osb->s_feature_incompat) * 8) {
d659072f TM	307	mlog(ML_ERROR, "The disk is too old and small. "
	308	"Force to do offline resize.");
	309	ret = -EINVAL;
	310	goto out_unlock;
d659072f TM	311	}
	312
	313	first_new_cluster = le32_to_cpu(fe->i_clusters);
	314	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	315	first_new_cluster - 1);
	316
68f64d47 JB	317	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
68f64d47 JB	318	&group_bh);
d659072f TM	319	if (ret < 0) {
	320	mlog_errno(ret);
	321	goto out_unlock;
	322	}
d659072f TM	323	group = (struct ocfs2_group_desc *)group_bh->b_data;
d659072f TM	324
d659072f TM	325	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	326	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	327	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	328	ret = -EINVAL;
	329	goto out_unlock;
	330	}
	331
a5438702 TM	332
a5438702 TM	333	trace_ocfs2_group_extend(
7909f2bf	334	(unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
d659072f TM	335
	336	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	337	if (IS_ERR(handle)) {
	338	mlog_errno(PTR_ERR(handle));
	339	ret = -EINVAL;
	340	goto out_unlock;
	341	}
	342
	343	/* update the last group descriptor and inode. */
	344	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	345	main_bm_bh, group_bh,
	346	first_new_cluster,
	347	new_clusters);
	348	if (ret) {
	349	mlog_errno(ret);
	350	goto out_commit;
	351	}
	352
	353	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
	354
	355	out_commit:
	356	ocfs2_commit_trans(osb, handle);
	357	out_unlock:
2fe5c1d7 MF	358	brelse(group_bh);
2fe5c1d7 MF	359	brelse(main_bm_bh);
d659072f TM	360
	361	ocfs2_inode_unlock(main_bm_inode, 1);
	362
	363	out_mutex:
5955102c	364	inode_unlock(main_bm_inode);
d659072f TM	365	iput(main_bm_inode);
	366
	367	out:
d659072f TM	368	return ret;
d659072f TM	369	}
7909f2bf TM	370
	371	static int ocfs2_check_new_group(struct inode *inode,
	372	struct ocfs2_dinode *di,
	373	struct ocfs2_new_group_input *input,
	374	struct buffer_head *group_bh)
	375	{
	376	int ret;
57e3e797 JB	377	struct ocfs2_group_desc *gd =
57e3e797 JB	378	(struct ocfs2_group_desc *)group_bh->b_data;
7909f2bf	379	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
7909f2bf	380
970e4936	381	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
57e3e797 JB	382	if (ret)
57e3e797 JB	383	goto out;
7909f2bf	384
57e3e797 JB	385	ret = -EINVAL;
57e3e797 JB	386	if (le16_to_cpu(gd->bg_chain) != input->chain)
7909f2bf TM	387	mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
	388	"while input has %u set.\n",
	389	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	390	le16_to_cpu(gd->bg_chain), input->chain);
	391	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
	392	mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
	393	"input has %u clusters set\n",
	394	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	395	le16_to_cpu(gd->bg_bits), input->clusters);
	396	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
	397	mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
	398	"but it should have %u set\n",
	399	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	400	le16_to_cpu(gd->bg_bits),
	401	input->frees * cl_bpc);
	402	else
	403	ret = 0;
	404
57e3e797	405	out:
7909f2bf TM	406	return ret;
	407	}
	408
	409	static int ocfs2_verify_group_and_input(struct inode *inode,
	410	struct ocfs2_dinode *di,
	411	struct ocfs2_new_group_input *input,
	412	struct buffer_head *group_bh)
	413	{
	414	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	415	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	416	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	417	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	418	u32 total_clusters = le32_to_cpu(di->i_clusters);
	419	int ret = -EINVAL;
	420
	421	if (cluster < total_clusters)
	422	mlog(ML_ERROR, "add a group which is in the current volume.\n");
	423	else if (input->chain >= cl_count)
	424	mlog(ML_ERROR, "input chain exceeds the limit.\n");
	425	else if (next_free != cl_count && next_free != input->chain)
	426	mlog(ML_ERROR,
	427	"the add group should be in chain %u\n", next_free);
	428	else if (total_clusters + input->clusters < total_clusters)
	429	mlog(ML_ERROR, "add group's clusters overflow.\n");
	430	else if (input->clusters > cl_cpg)
	431	mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	432	else if (input->frees > input->clusters)
	433	mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	434	else if (total_clusters % cl_cpg != 0)
	435	mlog(ML_ERROR,
	436	"the last group isn't full. Use group extend first.\n");
	437	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
	438	mlog(ML_ERROR, "group blkno is invalid\n");
	439	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
	440	mlog(ML_ERROR, "group descriptor check failed.\n");
	441	else
	442	ret = 0;
	443
	444	return ret;
	445	}
	446
	447	/* Add a new group descriptor to global_bitmap. */
	448	int ocfs2_group_add(struct inode inode, struct ocfs2_new_group_input input)
	449	{
	450	int ret;
	451	handle_t *handle;
	452	struct buffer_head *main_bm_bh = NULL;
	453	struct inode *main_bm_inode = NULL;
	454	struct ocfs2_dinode *fe = NULL;
	455	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	456	struct buffer_head *group_bh = NULL;
	457	struct ocfs2_group_desc *group = NULL;
	458	struct ocfs2_chain_list *cl;
	459	struct ocfs2_chain_rec *cr;
	460	u16 cl_bpc;
eedd40e1	461	u64 bg_ptr;
7909f2bf	462
7909f2bf TM	463	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	464	return -EROFS;
	465
	466	main_bm_inode = ocfs2_get_system_file_inode(osb,
	467	GLOBAL_BITMAP_SYSTEM_INODE,
	468	OCFS2_INVALID_SLOT);
	469	if (!main_bm_inode) {
	470	ret = -EINVAL;
	471	mlog_errno(ret);
	472	goto out;
	473	}
	474
5955102c	475	inode_lock(main_bm_inode);
7909f2bf TM	476
	477	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	478	if (ret < 0) {
	479	mlog_errno(ret);
	480	goto out_mutex;
	481	}
	482
	483	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	484
	485	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	486	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	487	osb->s_feature_incompat) * 8) {
7909f2bf TM	488	mlog(ML_ERROR, "The disk is too old and small."
	489	" Force to do offline resize.");
	490	ret = -EINVAL;
	491	goto out_unlock;
	492	}
	493
da1e9098	494	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
7909f2bf TM	495	if (ret < 0) {
	496	mlog(ML_ERROR, "Can't read the group descriptor # %llu "
	497	"from the device.", (unsigned long long)input->group);
	498	goto out_unlock;
	499	}
	500
8cb471e8	501	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
7909f2bf TM	502
	503	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	504	if (ret) {
	505	mlog_errno(ret);
8abaae8d	506	goto out_free_group_bh;
7909f2bf TM	507	}
7909f2bf TM	508
a5438702 TM	509	trace_ocfs2_group_add((unsigned long long)input->group,
a5438702 TM	510	input->chain, input->clusters, input->frees);
7909f2bf TM	511
	512	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	513	if (IS_ERR(handle)) {
	514	mlog_errno(PTR_ERR(handle));
	515	ret = -EINVAL;
8abaae8d	516	goto out_free_group_bh;
7909f2bf TM	517	}
	518
	519	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	520	cl = &fe->id2.i_chain;
	521	cr = &cl->cl_recs[input->chain];
	522
0cf2f763 JB	523	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	524	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	525	if (ret < 0) {
	526	mlog_errno(ret);
	527	goto out_commit;
	528	}
	529
	530	group = (struct ocfs2_group_desc *)group_bh->b_data;
eedd40e1	531	bg_ptr = le64_to_cpu(group->bg_next_group);
7909f2bf	532	group->bg_next_group = cr->c_blkno;
ec20cec7	533	ocfs2_journal_dirty(handle, group_bh);
7909f2bf	534
0cf2f763 JB	535	ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	536	main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf	537	if (ret < 0) {
eedd40e1	538	group->bg_next_group = cpu_to_le64(bg_ptr);
7909f2bf TM	539	mlog_errno(ret);
	540	goto out_commit;
	541	}
	542
	543	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
	544	le16_add_cpu(&cl->cl_next_free_rec, 1);
	545	memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	546	}
	547
4338ab6a	548	cr->c_blkno = cpu_to_le64(input->group);
7909f2bf TM	549	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	550	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
	551
	552	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	553	le32_add_cpu(&fe->id1.bitmap1.i_used,
	554	(input->clusters - input->frees) * cl_bpc);
	555	le32_add_cpu(&fe->i_clusters, input->clusters);
	556
	557	ocfs2_journal_dirty(handle, main_bm_bh);
	558
	559	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	560	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
17bf1418	561	le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
7909f2bf TM	562	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	563	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
	564
	565	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
	566
	567	out_commit:
	568	ocfs2_commit_trans(osb, handle);
8abaae8d YL	569
8abaae8d YL	570	out_free_group_bh:
2fe5c1d7	571	brelse(group_bh);
8abaae8d YL	572
8abaae8d YL	573	out_unlock:
2fe5c1d7	574	brelse(main_bm_bh);
7909f2bf TM	575
	576	ocfs2_inode_unlock(main_bm_inode, 1);
	577
	578	out_mutex:
5955102c	579	inode_unlock(main_bm_inode);
7909f2bf TM	580	iput(main_bm_inode);
	581
	582	out:
7909f2bf TM	583	return ret;
7909f2bf TM	584	}