[net-next-2.6.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++;
	}

	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_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:
	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_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;

	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;

	/* 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:
	mlog_exit_void();
	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;

	mlog_entry_void();

	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:
	mlog_exit_void();
	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
85	mlog_exit_void();
86	return backups;
87	}
88
89	static int ocfs2_update_last_group_and_inode(handle_t *handle,
90	struct inode *bm_inode,
91	struct buffer_head *bm_bh,
92	struct buffer_head *group_bh,
93	u32 first_new_cluster,
94	int new_clusters)
95	{
96	int ret = 0;
97	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
98	struct ocfs2_dinode fe = (struct ocfs2_dinode ) bm_bh->b_data;
99	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
100	struct ocfs2_chain_rec *cr;
101	struct ocfs2_group_desc *group;
102	u16 chain, num_bits, backups = 0;
103	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
104	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
105
106	mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
107	new_clusters, first_new_cluster);
108
0cf2f763 JB	109	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
0cf2f763 JB	110	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	111	if (ret < 0) {
	112	mlog_errno(ret);
	113	goto out;
	114	}
	115
	116	group = (struct ocfs2_group_desc *)group_bh->b_data;
	117
	118	/* update the group first. */
	119	num_bits = new_clusters * cl_bpc;
	120	le16_add_cpu(&group->bg_bits, num_bits);
	121	le16_add_cpu(&group->bg_free_bits_count, num_bits);
	122
	123	/*
	124	* check whether there are some new backup superblocks exist in
	125	* this group and update the group bitmap accordingly.
	126	*/
	127	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
	128	OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
	129	backups = ocfs2_calc_new_backup_super(bm_inode,
	130	group,
	131	new_clusters,
	132	first_new_cluster,
	133	cl_cpg, 1);
	134	le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	135	}
	136
ec20cec7	137	ocfs2_journal_dirty(handle, group_bh);
d659072f TM	138
d659072f TM	139	/* update the inode accordingly. */
0cf2f763	140	ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
13723d00	141	OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	142	if (ret < 0) {
	143	mlog_errno(ret);
	144	goto out_rollback;
	145	}
	146
	147	chain = le16_to_cpu(group->bg_chain);
	148	cr = (&cl->cl_recs[chain]);
	149	le32_add_cpu(&cr->c_total, num_bits);
	150	le32_add_cpu(&cr->c_free, num_bits);
	151	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	152	le32_add_cpu(&fe->i_clusters, new_clusters);
	153
	154	if (backups) {
	155	le32_add_cpu(&cr->c_free, -1 * backups);
	156	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	157	}
	158
	159	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	160	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	161	le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
	162	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	163	i_size_write(bm_inode, le64_to_cpu(fe->i_size));
	164
	165	ocfs2_journal_dirty(handle, bm_bh);
	166
	167	out_rollback:
	168	if (ret < 0) {
	169	ocfs2_calc_new_backup_super(bm_inode,
	170	group,
	171	new_clusters,
	172	first_new_cluster,
	173	cl_cpg, 0);
	174	le16_add_cpu(&group->bg_free_bits_count, backups);
	175	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	176	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
	177	}
	178	out:
	179	mlog_exit(ret);
	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
	284	mlog_entry_void();
	285
	286	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	287	return -EROFS;
	288
	289	if (new_clusters < 0)
	290	return -EINVAL;
	291	else if (new_clusters == 0)
	292	return 0;
	293
	294	main_bm_inode = ocfs2_get_system_file_inode(osb,
	295	GLOBAL_BITMAP_SYSTEM_INODE,
	296	OCFS2_INVALID_SLOT);
	297	if (!main_bm_inode) {
	298	ret = -EINVAL;
	299	mlog_errno(ret);
	300	goto out;
	301	}
	302
	303	mutex_lock(&main_bm_inode->i_mutex);
	304
	305	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	306	if (ret < 0) {
	307	mlog_errno(ret);
	308	goto out_mutex;
	309	}
	310
	311	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	312
10995aa2 JB	313	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	314	* so any corruption is a code bug. */
	315	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
	316
d659072f	317	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	318	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	319	osb->s_feature_incompat) * 8) {
d659072f TM	320	mlog(ML_ERROR, "The disk is too old and small. "
	321	"Force to do offline resize.");
	322	ret = -EINVAL;
	323	goto out_unlock;
d659072f TM	324	}
	325
	326	first_new_cluster = le32_to_cpu(fe->i_clusters);
	327	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	328	first_new_cluster - 1);
	329
68f64d47 JB	330	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
68f64d47 JB	331	&group_bh);
d659072f TM	332	if (ret < 0) {
	333	mlog_errno(ret);
	334	goto out_unlock;
	335	}
d659072f TM	336	group = (struct ocfs2_group_desc *)group_bh->b_data;
d659072f TM	337
d659072f TM	338	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	339	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	340	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	341	ret = -EINVAL;
	342	goto out_unlock;
	343	}
	344
	345	mlog(0, "extend the last group at %llu, new clusters = %d\n",
7909f2bf	346	(unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
d659072f TM	347
	348	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	349	if (IS_ERR(handle)) {
	350	mlog_errno(PTR_ERR(handle));
	351	ret = -EINVAL;
	352	goto out_unlock;
	353	}
	354
	355	/* update the last group descriptor and inode. */
	356	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	357	main_bm_bh, group_bh,
	358	first_new_cluster,
	359	new_clusters);
	360	if (ret) {
	361	mlog_errno(ret);
	362	goto out_commit;
	363	}
	364
	365	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
	366
	367	out_commit:
	368	ocfs2_commit_trans(osb, handle);
	369	out_unlock:
2fe5c1d7 MF	370	brelse(group_bh);
2fe5c1d7 MF	371	brelse(main_bm_bh);
d659072f TM	372
	373	ocfs2_inode_unlock(main_bm_inode, 1);
	374
	375	out_mutex:
	376	mutex_unlock(&main_bm_inode->i_mutex);
	377	iput(main_bm_inode);
	378
	379	out:
	380	mlog_exit_void();
	381	return ret;
	382	}
7909f2bf TM	383
	384	static int ocfs2_check_new_group(struct inode *inode,
	385	struct ocfs2_dinode *di,
	386	struct ocfs2_new_group_input *input,
	387	struct buffer_head *group_bh)
	388	{
	389	int ret;
57e3e797 JB	390	struct ocfs2_group_desc *gd =
57e3e797 JB	391	(struct ocfs2_group_desc *)group_bh->b_data;
7909f2bf	392	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
7909f2bf	393
970e4936	394	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
57e3e797 JB	395	if (ret)
57e3e797 JB	396	goto out;
7909f2bf	397
57e3e797 JB	398	ret = -EINVAL;
57e3e797 JB	399	if (le16_to_cpu(gd->bg_chain) != input->chain)
7909f2bf TM	400	mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
	401	"while input has %u set.\n",
	402	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	403	le16_to_cpu(gd->bg_chain), input->chain);
	404	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
	405	mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
	406	"input has %u clusters set\n",
	407	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	408	le16_to_cpu(gd->bg_bits), input->clusters);
	409	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
	410	mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
	411	"but it should have %u set\n",
	412	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	413	le16_to_cpu(gd->bg_bits),
	414	input->frees * cl_bpc);
	415	else
	416	ret = 0;
	417
57e3e797	418	out:
7909f2bf TM	419	return ret;
	420	}
	421
	422	static int ocfs2_verify_group_and_input(struct inode *inode,
	423	struct ocfs2_dinode *di,
	424	struct ocfs2_new_group_input *input,
	425	struct buffer_head *group_bh)
	426	{
	427	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	428	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	429	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	430	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	431	u32 total_clusters = le32_to_cpu(di->i_clusters);
	432	int ret = -EINVAL;
	433
	434	if (cluster < total_clusters)
	435	mlog(ML_ERROR, "add a group which is in the current volume.\n");
	436	else if (input->chain >= cl_count)
	437	mlog(ML_ERROR, "input chain exceeds the limit.\n");
	438	else if (next_free != cl_count && next_free != input->chain)
	439	mlog(ML_ERROR,
	440	"the add group should be in chain %u\n", next_free);
	441	else if (total_clusters + input->clusters < total_clusters)
	442	mlog(ML_ERROR, "add group's clusters overflow.\n");
	443	else if (input->clusters > cl_cpg)
	444	mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	445	else if (input->frees > input->clusters)
	446	mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	447	else if (total_clusters % cl_cpg != 0)
	448	mlog(ML_ERROR,
	449	"the last group isn't full. Use group extend first.\n");
	450	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
	451	mlog(ML_ERROR, "group blkno is invalid\n");
	452	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
	453	mlog(ML_ERROR, "group descriptor check failed.\n");
	454	else
	455	ret = 0;
	456
	457	return ret;
	458	}
	459
	460	/* Add a new group descriptor to global_bitmap. */
	461	int ocfs2_group_add(struct inode inode, struct ocfs2_new_group_input input)
	462	{
	463	int ret;
	464	handle_t *handle;
	465	struct buffer_head *main_bm_bh = NULL;
	466	struct inode *main_bm_inode = NULL;
	467	struct ocfs2_dinode *fe = NULL;
	468	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	469	struct buffer_head *group_bh = NULL;
	470	struct ocfs2_group_desc *group = NULL;
	471	struct ocfs2_chain_list *cl;
	472	struct ocfs2_chain_rec *cr;
	473	u16 cl_bpc;
	474
	475	mlog_entry_void();
	476
	477	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	478	return -EROFS;
	479
	480	main_bm_inode = ocfs2_get_system_file_inode(osb,
	481	GLOBAL_BITMAP_SYSTEM_INODE,
	482	OCFS2_INVALID_SLOT);
483	if (!main_bm_inode) {
484	ret = -EINVAL;
485	mlog_errno(ret);
486	goto out;
487	}
488
489	mutex_lock(&main_bm_inode->i_mutex);
490
491	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
492	if (ret < 0) {
493	mlog_errno(ret);
494	goto out_mutex;
495	}
496
497	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
498
499	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	500	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	501	osb->s_feature_incompat) * 8) {
7909f2bf TM	502	mlog(ML_ERROR, "The disk is too old and small."
	503	" Force to do offline resize.");
	504	ret = -EINVAL;
	505	goto out_unlock;
	506	}
	507
da1e9098	508	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
7909f2bf TM	509	if (ret < 0) {
	510	mlog(ML_ERROR, "Can't read the group descriptor # %llu "
	511	"from the device.", (unsigned long long)input->group);
	512	goto out_unlock;
	513	}
	514
8cb471e8	515	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
7909f2bf TM	516
	517	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	518	if (ret) {
	519	mlog_errno(ret);
	520	goto out_unlock;
	521	}
	522
	523	mlog(0, "Add a new group %llu in chain = %u, length = %u\n",
	524	(unsigned long long)input->group, input->chain, input->clusters);
	525
	526	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	527	if (IS_ERR(handle)) {
	528	mlog_errno(PTR_ERR(handle));
	529	ret = -EINVAL;
	530	goto out_unlock;
	531	}
	532
	533	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	534	cl = &fe->id2.i_chain;
	535	cr = &cl->cl_recs[input->chain];
	536
0cf2f763 JB	537	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	538	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	539	if (ret < 0) {
	540	mlog_errno(ret);
	541	goto out_commit;
	542	}
	543
	544	group = (struct ocfs2_group_desc *)group_bh->b_data;
	545	group->bg_next_group = cr->c_blkno;
ec20cec7	546	ocfs2_journal_dirty(handle, group_bh);
7909f2bf	547
0cf2f763 JB	548	ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	549	main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	550	if (ret < 0) {
	551	mlog_errno(ret);
	552	goto out_commit;
	553	}
	554
	555	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
	556	le16_add_cpu(&cl->cl_next_free_rec, 1);
	557	memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	558	}
	559
4338ab6a	560	cr->c_blkno = cpu_to_le64(input->group);
7909f2bf TM	561	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	562	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
	563
	564	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	565	le32_add_cpu(&fe->id1.bitmap1.i_used,
	566	(input->clusters - input->frees) * cl_bpc);
	567	le32_add_cpu(&fe->i_clusters, input->clusters);
	568
	569	ocfs2_journal_dirty(handle, main_bm_bh);
	570
	571	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	572	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	573	le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
	574	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	575	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
	576
	577	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
	578
	579	out_commit:
	580	ocfs2_commit_trans(osb, handle);
	581	out_unlock:
2fe5c1d7 MF	582	brelse(group_bh);
2fe5c1d7 MF	583	brelse(main_bm_bh);
7909f2bf TM	584
	585	ocfs2_inode_unlock(main_bm_inode, 1);
	586
	587	out_mutex:
	588	mutex_unlock(&main_bm_inode->i_mutex);
	589	iput(main_bm_inode);
	590
	591	out:
	592	mlog_exit_void();
	593	return ret;
	594	}