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

/* -*- 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++;
	}

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

	/* 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);
	}

	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, 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:
	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;
	}

	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;

	/* 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;
	}

	mlog(0, "extend the last group at %llu, new clusters = %d\n",
	     (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:
	mutex_unlock(&main_bm_inode->i_mutex);
	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;

	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;
	}

	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, 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_unlock;
	}

	mlog(0, "Add a new group  %llu in chain = %u, length = %u\n",
	     (unsigned long long)input->group, input->chain, input->clusters);

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

	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;
	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) {
		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, 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_unlock:
	brelse(group_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:
	return ret;
}
Commit	Line	Data
d659072f TM	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* resize.c
	5	*
	6	* volume resize.
	7	* Inspired by ext3/resize.c.
	8	*
	9	* Copyright (C) 2007 Oracle. All rights reserved.
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public
	13	* License as published by the Free Software Foundation; either
	14	* version 2 of the License, or (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public
	22	* License along with this program; if not, write to the
	23	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	24	* Boston, MA 021110-1307, USA.
	25	*/
	26
	27	#include <linux/fs.h>
	28	#include <linux/types.h>
	29
	30	#define MLOG_MASK_PREFIX ML_DISK_ALLOC
	31	#include <cluster/masklog.h>
	32
	33	#include "ocfs2.h"
	34
	35	#include "alloc.h"
	36	#include "dlmglue.h"
	37	#include "inode.h"
	38	#include "journal.h"
	39	#include "super.h"
	40	#include "sysfile.h"
	41	#include "uptodate.h"
	42
	43	#include "buffer_head_io.h"
	44	#include "suballoc.h"
	45	#include "resize.h"
	46
	47	/*
	48	* Check whether there are new backup superblocks exist
	49	* in the last group. If there are some, mark them or clear
	50	* them in the bitmap.
	51	*
	52	* Return how many backups we find in the last group.
	53	*/
	54	static u16 ocfs2_calc_new_backup_super(struct inode *inode,
	55	struct ocfs2_group_desc *gd,
	56	int new_clusters,
	57	u32 first_new_cluster,
	58	u16 cl_cpg,
	59	int set)
	60	{
	61	int i;
	62	u16 backups = 0;
	63	u32 cluster;
	64	u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
65
66	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
67	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
68	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
69
70	gd_blkno = ocfs2_which_cluster_group(inode, cluster);
71	if (gd_blkno < lgd_blkno)
72	continue;
73	else if (gd_blkno > lgd_blkno)
74	break;
75
76	if (set)
77	ocfs2_set_bit(cluster % cl_cpg,
78	(unsigned long *)gd->bg_bitmap);
79	else
80	ocfs2_clear_bit(cluster % cl_cpg,
81	(unsigned long *)gd->bg_bitmap);
82	backups++;
83	}
84
d659072f TM	85	return backups;
	86	}
	87
	88	static int ocfs2_update_last_group_and_inode(handle_t *handle,
	89	struct inode *bm_inode,
	90	struct buffer_head *bm_bh,
	91	struct buffer_head *group_bh,
	92	u32 first_new_cluster,
	93	int new_clusters)
	94	{
	95	int ret = 0;
	96	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
	97	struct ocfs2_dinode fe = (struct ocfs2_dinode ) bm_bh->b_data;
	98	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
	99	struct ocfs2_chain_rec *cr;
	100	struct ocfs2_group_desc *group;
	101	u16 chain, num_bits, backups = 0;
	102	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
	103	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
	104
ef6b689b TM	105	mlog(0, "(new_clusters=%d, first_new_cluster = %u)\n",
ef6b689b TM	106	new_clusters, first_new_cluster);
d659072f	107
0cf2f763 JB	108	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
0cf2f763 JB	109	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	110	if (ret < 0) {
	111	mlog_errno(ret);
	112	goto out;
	113	}
	114
	115	group = (struct ocfs2_group_desc *)group_bh->b_data;
	116
	117	/* update the group first. */
	118	num_bits = new_clusters * cl_bpc;
	119	le16_add_cpu(&group->bg_bits, num_bits);
	120	le16_add_cpu(&group->bg_free_bits_count, num_bits);
	121
	122	/*
	123	* check whether there are some new backup superblocks exist in
	124	* this group and update the group bitmap accordingly.
	125	*/
	126	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
	127	OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
	128	backups = ocfs2_calc_new_backup_super(bm_inode,
	129	group,
	130	new_clusters,
	131	first_new_cluster,
	132	cl_cpg, 1);
	133	le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	134	}
	135
ec20cec7	136	ocfs2_journal_dirty(handle, group_bh);
d659072f TM	137
d659072f TM	138	/* update the inode accordingly. */
0cf2f763	139	ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
13723d00	140	OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	141	if (ret < 0) {
	142	mlog_errno(ret);
	143	goto out_rollback;
	144	}
	145
	146	chain = le16_to_cpu(group->bg_chain);
	147	cr = (&cl->cl_recs[chain]);
	148	le32_add_cpu(&cr->c_total, num_bits);
	149	le32_add_cpu(&cr->c_free, num_bits);
	150	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	151	le32_add_cpu(&fe->i_clusters, new_clusters);
	152
	153	if (backups) {
	154	le32_add_cpu(&cr->c_free, -1 * backups);
	155	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	156	}
	157
	158	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	159	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	160	le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
	161	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	162	i_size_write(bm_inode, le64_to_cpu(fe->i_size));
	163
	164	ocfs2_journal_dirty(handle, bm_bh);
	165
	166	out_rollback:
	167	if (ret < 0) {
	168	ocfs2_calc_new_backup_super(bm_inode,
	169	group,
	170	new_clusters,
	171	first_new_cluster,
	172	cl_cpg, 0);
	173	le16_add_cpu(&group->bg_free_bits_count, backups);
	174	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	175	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
	176	}
	177	out:
c1e8d35e TM	178	if (ret)
c1e8d35e TM	179	mlog_errno(ret);
d659072f TM	180	return ret;
	181	}
	182
	183	static int update_backups(struct inode * inode, u32 clusters, char *data)
	184	{
	185	int i, ret = 0;
	186	u32 cluster;
	187	u64 blkno;
	188	struct buffer_head *backup = NULL;
	189	struct ocfs2_dinode *backup_di = NULL;
	190	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	191
	192	/* calculate the real backups we need to update. */
	193	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	194	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	195	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
	196	if (cluster > clusters)
	197	break;
	198
da1e9098	199	ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
d659072f TM	200	if (ret < 0) {
	201	mlog_errno(ret);
	202	break;
	203	}
	204
	205	memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
	206
	207	backup_di = (struct ocfs2_dinode *)backup->b_data;
	208	backup_di->i_blkno = cpu_to_le64(blkno);
	209
	210	ret = ocfs2_write_super_or_backup(osb, backup);
	211	brelse(backup);
	212	backup = NULL;
	213	if (ret < 0) {
	214	mlog_errno(ret);
	215	break;
	216	}
	217	}
	218
	219	return ret;
	220	}
	221
	222	static void ocfs2_update_super_and_backups(struct inode *inode,
	223	int new_clusters)
	224	{
	225	int ret;
	226	u32 clusters = 0;
	227	struct buffer_head *super_bh = NULL;
	228	struct ocfs2_dinode *super_di = NULL;
	229	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	230
	231	/*
	232	* update the superblock last.
	233	* It doesn't matter if the write failed.
	234	*/
da1e9098 JB	235	ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
da1e9098 JB	236	&super_bh);
d659072f TM	237	if (ret < 0) {
	238	mlog_errno(ret);
	239	goto out;
	240	}
	241
	242	super_di = (struct ocfs2_dinode *)super_bh->b_data;
	243	le32_add_cpu(&super_di->i_clusters, new_clusters);
	244	clusters = le32_to_cpu(super_di->i_clusters);
	245
	246	ret = ocfs2_write_super_or_backup(osb, super_bh);
	247	if (ret < 0) {
	248	mlog_errno(ret);
	249	goto out;
	250	}
	251
	252	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
	253	ret = update_backups(inode, clusters, super_bh->b_data);
	254
	255	out:
2fe5c1d7	256	brelse(super_bh);
d659072f TM	257	if (ret)
	258	printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
	259	" during fs resize. This condition is not fatal,"
	260	" but fsck.ocfs2 should be run to fix it\n",
	261	osb->dev_str);
	262	return;
	263	}
	264
	265	/*
	266	* Extend the filesystem to the new number of clusters specified. This entry
	267	* point is only used to extend the current filesystem to the end of the last
	268	* existing group.
	269	*/
	270	int ocfs2_group_extend(struct inode * inode, int new_clusters)
	271	{
	272	int ret;
	273	handle_t *handle;
	274	struct buffer_head *main_bm_bh = NULL;
	275	struct buffer_head *group_bh = NULL;
	276	struct inode *main_bm_inode = NULL;
	277	struct ocfs2_dinode *fe = NULL;
	278	struct ocfs2_group_desc *group = NULL;
	279	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	280	u16 cl_bpc;
	281	u32 first_new_cluster;
	282	u64 lgd_blkno;
	283
d659072f TM	284	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	285	return -EROFS;
	286
	287	if (new_clusters < 0)
	288	return -EINVAL;
	289	else if (new_clusters == 0)
	290	return 0;
	291
	292	main_bm_inode = ocfs2_get_system_file_inode(osb,
	293	GLOBAL_BITMAP_SYSTEM_INODE,
	294	OCFS2_INVALID_SLOT);
	295	if (!main_bm_inode) {
	296	ret = -EINVAL;
	297	mlog_errno(ret);
	298	goto out;
	299	}
	300
	301	mutex_lock(&main_bm_inode->i_mutex);
	302
	303	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	304	if (ret < 0) {
	305	mlog_errno(ret);
	306	goto out_mutex;
	307	}
	308
	309	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	310
10995aa2 JB	311	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	312	* so any corruption is a code bug. */
	313	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
	314
d659072f	315	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	316	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	317	osb->s_feature_incompat) * 8) {
d659072f TM	318	mlog(ML_ERROR, "The disk is too old and small. "
	319	"Force to do offline resize.");
	320	ret = -EINVAL;
	321	goto out_unlock;
d659072f TM	322	}
	323
	324	first_new_cluster = le32_to_cpu(fe->i_clusters);
	325	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	326	first_new_cluster - 1);
	327
68f64d47 JB	328	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
68f64d47 JB	329	&group_bh);
d659072f TM	330	if (ret < 0) {
	331	mlog_errno(ret);
	332	goto out_unlock;
	333	}
d659072f TM	334	group = (struct ocfs2_group_desc *)group_bh->b_data;
d659072f TM	335
d659072f TM	336	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	337	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	338	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	339	ret = -EINVAL;
	340	goto out_unlock;
	341	}
	342
	343	mlog(0, "extend the last group at %llu, new clusters = %d\n",
7909f2bf	344	(unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
d659072f TM	345
	346	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	347	if (IS_ERR(handle)) {
	348	mlog_errno(PTR_ERR(handle));
	349	ret = -EINVAL;
	350	goto out_unlock;
	351	}
	352
	353	/* update the last group descriptor and inode. */
	354	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	355	main_bm_bh, group_bh,
	356	first_new_cluster,
	357	new_clusters);
	358	if (ret) {
	359	mlog_errno(ret);
	360	goto out_commit;
	361	}
	362
	363	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
	364
	365	out_commit:
	366	ocfs2_commit_trans(osb, handle);
	367	out_unlock:
2fe5c1d7 MF	368	brelse(group_bh);
2fe5c1d7 MF	369	brelse(main_bm_bh);
d659072f TM	370
	371	ocfs2_inode_unlock(main_bm_inode, 1);
	372
	373	out_mutex:
	374	mutex_unlock(&main_bm_inode->i_mutex);
	375	iput(main_bm_inode);
	376
	377	out:
d659072f TM	378	return ret;
d659072f TM	379	}
7909f2bf TM	380
	381	static int ocfs2_check_new_group(struct inode *inode,
	382	struct ocfs2_dinode *di,
	383	struct ocfs2_new_group_input *input,
	384	struct buffer_head *group_bh)
	385	{
	386	int ret;
57e3e797 JB	387	struct ocfs2_group_desc *gd =
57e3e797 JB	388	(struct ocfs2_group_desc *)group_bh->b_data;
7909f2bf	389	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
7909f2bf	390
970e4936	391	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
57e3e797 JB	392	if (ret)
57e3e797 JB	393	goto out;
7909f2bf	394
57e3e797 JB	395	ret = -EINVAL;
57e3e797 JB	396	if (le16_to_cpu(gd->bg_chain) != input->chain)
7909f2bf TM	397	mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
	398	"while input has %u set.\n",
	399	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	400	le16_to_cpu(gd->bg_chain), input->chain);
	401	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
	402	mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
	403	"input has %u clusters set\n",
	404	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	405	le16_to_cpu(gd->bg_bits), input->clusters);
	406	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
	407	mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
	408	"but it should have %u set\n",
	409	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	410	le16_to_cpu(gd->bg_bits),
	411	input->frees * cl_bpc);
	412	else
	413	ret = 0;
	414
57e3e797	415	out:
7909f2bf TM	416	return ret;
	417	}
	418
	419	static int ocfs2_verify_group_and_input(struct inode *inode,
	420	struct ocfs2_dinode *di,
	421	struct ocfs2_new_group_input *input,
	422	struct buffer_head *group_bh)
	423	{
	424	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	425	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	426	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	427	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	428	u32 total_clusters = le32_to_cpu(di->i_clusters);
	429	int ret = -EINVAL;
	430
	431	if (cluster < total_clusters)
	432	mlog(ML_ERROR, "add a group which is in the current volume.\n");
	433	else if (input->chain >= cl_count)
	434	mlog(ML_ERROR, "input chain exceeds the limit.\n");
	435	else if (next_free != cl_count && next_free != input->chain)
	436	mlog(ML_ERROR,
	437	"the add group should be in chain %u\n", next_free);
	438	else if (total_clusters + input->clusters < total_clusters)
	439	mlog(ML_ERROR, "add group's clusters overflow.\n");
	440	else if (input->clusters > cl_cpg)
	441	mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	442	else if (input->frees > input->clusters)
	443	mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	444	else if (total_clusters % cl_cpg != 0)
	445	mlog(ML_ERROR,
	446	"the last group isn't full. Use group extend first.\n");
	447	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
	448	mlog(ML_ERROR, "group blkno is invalid\n");
	449	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
	450	mlog(ML_ERROR, "group descriptor check failed.\n");
	451	else
	452	ret = 0;
	453
	454	return ret;
	455	}
	456
	457	/* Add a new group descriptor to global_bitmap. */
	458	int ocfs2_group_add(struct inode inode, struct ocfs2_new_group_input input)
	459	{
	460	int ret;
	461	handle_t *handle;
	462	struct buffer_head *main_bm_bh = NULL;
	463	struct inode *main_bm_inode = NULL;
	464	struct ocfs2_dinode *fe = NULL;
	465	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	466	struct buffer_head *group_bh = NULL;
	467	struct ocfs2_group_desc *group = NULL;
	468	struct ocfs2_chain_list *cl;
	469	struct ocfs2_chain_rec *cr;
	470	u16 cl_bpc;
	471
7909f2bf TM	472	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	473	return -EROFS;
	474
	475	main_bm_inode = ocfs2_get_system_file_inode(osb,
	476	GLOBAL_BITMAP_SYSTEM_INODE,
	477	OCFS2_INVALID_SLOT);
	478	if (!main_bm_inode) {
	479	ret = -EINVAL;
	480	mlog_errno(ret);
	481	goto out;
	482	}
	483
	484	mutex_lock(&main_bm_inode->i_mutex);
	485
	486	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	487	if (ret < 0) {
	488	mlog_errno(ret);
	489	goto out_mutex;
	490	}
	491
	492	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	493
	494	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	495	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	496	osb->s_feature_incompat) * 8) {
7909f2bf TM	497	mlog(ML_ERROR, "The disk is too old and small."
	498	" Force to do offline resize.");
	499	ret = -EINVAL;
	500	goto out_unlock;
	501	}
	502
da1e9098	503	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
7909f2bf TM	504	if (ret < 0) {
	505	mlog(ML_ERROR, "Can't read the group descriptor # %llu "
	506	"from the device.", (unsigned long long)input->group);
	507	goto out_unlock;
	508	}
	509
8cb471e8	510	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
7909f2bf TM	511
	512	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	513	if (ret) {
	514	mlog_errno(ret);
	515	goto out_unlock;
	516	}
	517
	518	mlog(0, "Add a new group %llu in chain = %u, length = %u\n",
	519	(unsigned long long)input->group, input->chain, input->clusters);
	520
	521	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	522	if (IS_ERR(handle)) {
	523	mlog_errno(PTR_ERR(handle));
	524	ret = -EINVAL;
	525	goto out_unlock;
	526	}
	527
	528	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	529	cl = &fe->id2.i_chain;
	530	cr = &cl->cl_recs[input->chain];
	531
0cf2f763 JB	532	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	533	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	534	if (ret < 0) {
	535	mlog_errno(ret);
	536	goto out_commit;
	537	}
	538
	539	group = (struct ocfs2_group_desc *)group_bh->b_data;
	540	group->bg_next_group = cr->c_blkno;
ec20cec7	541	ocfs2_journal_dirty(handle, group_bh);
7909f2bf	542
0cf2f763 JB	543	ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	544	main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	545	if (ret < 0) {
	546	mlog_errno(ret);
	547	goto out_commit;
	548	}
	549
	550	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
	551	le16_add_cpu(&cl->cl_next_free_rec, 1);
	552	memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	553	}
	554
4338ab6a	555	cr->c_blkno = cpu_to_le64(input->group);
7909f2bf TM	556	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	557	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
	558
	559	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	560	le32_add_cpu(&fe->id1.bitmap1.i_used,
	561	(input->clusters - input->frees) * cl_bpc);
	562	le32_add_cpu(&fe->i_clusters, input->clusters);
	563
	564	ocfs2_journal_dirty(handle, main_bm_bh);
	565
	566	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	567	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	568	le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
	569	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	570	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
	571
	572	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
	573
	574	out_commit:
	575	ocfs2_commit_trans(osb, handle);
	576	out_unlock:
2fe5c1d7 MF	577	brelse(group_bh);
2fe5c1d7 MF	578	brelse(main_bm_bh);
7909f2bf TM	579
	580	ocfs2_inode_unlock(main_bm_inode, 1);
	581
	582	out_mutex:
	583	mutex_unlock(&main_bm_inode->i_mutex);
	584	iput(main_bm_inode);
	585
	586	out:
7909f2bf TM	587	return ret;
7909f2bf TM	588	}