[mirror_ubuntu-artful-kernel.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, bm_inode, group_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

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

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

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

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

	/* update the inode accordingly. */
	ret = ocfs2_journal_access_di(handle, bm_inode, bm_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_rollback;
	}

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

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

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

	ocfs2_journal_dirty(handle, bm_bh);

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

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

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

		ret = ocfs2_read_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) * 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) * 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, 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, 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;

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

	ret = ocfs2_journal_access_di(handle, 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
13723d00 JB	109	ret = ocfs2_journal_access_gd(handle, bm_inode, group_bh,
13723d00 JB	110	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
	137	ret = ocfs2_journal_dirty(handle, group_bh);
	138	if (ret < 0) {
	139	mlog_errno(ret);
	140	goto out_rollback;
	141	}
	142
	143	/* update the inode accordingly. */
13723d00 JB	144	ret = ocfs2_journal_access_di(handle, bm_inode, bm_bh,
13723d00 JB	145	OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	146	if (ret < 0) {
	147	mlog_errno(ret);
	148	goto out_rollback;
	149	}
	150
	151	chain = le16_to_cpu(group->bg_chain);
	152	cr = (&cl->cl_recs[chain]);
	153	le32_add_cpu(&cr->c_total, num_bits);
	154	le32_add_cpu(&cr->c_free, num_bits);
	155	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	156	le32_add_cpu(&fe->i_clusters, new_clusters);
	157
	158	if (backups) {
	159	le32_add_cpu(&cr->c_free, -1 * backups);
	160	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	161	}
	162
	163	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	164	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	165	le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
	166	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	167	i_size_write(bm_inode, le64_to_cpu(fe->i_size));
	168
	169	ocfs2_journal_dirty(handle, bm_bh);
	170
	171	out_rollback:
	172	if (ret < 0) {
	173	ocfs2_calc_new_backup_super(bm_inode,
	174	group,
	175	new_clusters,
	176	first_new_cluster,
	177	cl_cpg, 0);
	178	le16_add_cpu(&group->bg_free_bits_count, backups);
	179	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	180	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
	181	}
	182	out:
	183	mlog_exit(ret);
	184	return ret;
	185	}
	186
	187	static int update_backups(struct inode * inode, u32 clusters, char *data)
	188	{
	189	int i, ret = 0;
	190	u32 cluster;
	191	u64 blkno;
	192	struct buffer_head *backup = NULL;
	193	struct ocfs2_dinode *backup_di = NULL;
	194	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	195
	196	/* calculate the real backups we need to update. */
	197	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	198	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	199	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
	200	if (cluster > clusters)
	201	break;
	202
da1e9098	203	ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
d659072f TM	204	if (ret < 0) {
	205	mlog_errno(ret);
	206	break;
	207	}
	208
	209	memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
	210
	211	backup_di = (struct ocfs2_dinode *)backup->b_data;
	212	backup_di->i_blkno = cpu_to_le64(blkno);
	213
	214	ret = ocfs2_write_super_or_backup(osb, backup);
	215	brelse(backup);
	216	backup = NULL;
	217	if (ret < 0) {
	218	mlog_errno(ret);
	219	break;
	220	}
	221	}
	222
	223	return ret;
	224	}
	225
	226	static void ocfs2_update_super_and_backups(struct inode *inode,
	227	int new_clusters)
	228	{
	229	int ret;
	230	u32 clusters = 0;
	231	struct buffer_head *super_bh = NULL;
	232	struct ocfs2_dinode *super_di = NULL;
	233	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	234
	235	/*
	236	* update the superblock last.
	237	* It doesn't matter if the write failed.
	238	*/
da1e9098 JB	239	ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
da1e9098 JB	240	&super_bh);
d659072f TM	241	if (ret < 0) {
	242	mlog_errno(ret);
	243	goto out;
	244	}
	245
	246	super_di = (struct ocfs2_dinode *)super_bh->b_data;
	247	le32_add_cpu(&super_di->i_clusters, new_clusters);
	248	clusters = le32_to_cpu(super_di->i_clusters);
	249
	250	ret = ocfs2_write_super_or_backup(osb, super_bh);
	251	if (ret < 0) {
	252	mlog_errno(ret);
	253	goto out;
	254	}
	255
	256	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
	257	ret = update_backups(inode, clusters, super_bh->b_data);
	258
	259	out:
2fe5c1d7	260	brelse(super_bh);
d659072f TM	261	if (ret)
	262	printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
	263	" during fs resize. This condition is not fatal,"
	264	" but fsck.ocfs2 should be run to fix it\n",
	265	osb->dev_str);
	266	return;
	267	}
	268
	269	/*
	270	* Extend the filesystem to the new number of clusters specified. This entry
	271	* point is only used to extend the current filesystem to the end of the last
	272	* existing group.
	273	*/
	274	int ocfs2_group_extend(struct inode * inode, int new_clusters)
	275	{
	276	int ret;
	277	handle_t *handle;
	278	struct buffer_head *main_bm_bh = NULL;
	279	struct buffer_head *group_bh = NULL;
	280	struct inode *main_bm_inode = NULL;
	281	struct ocfs2_dinode *fe = NULL;
	282	struct ocfs2_group_desc *group = NULL;
	283	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	284	u16 cl_bpc;
	285	u32 first_new_cluster;
	286	u64 lgd_blkno;
	287
	288	mlog_entry_void();
	289
	290	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	291	return -EROFS;
	292
	293	if (new_clusters < 0)
	294	return -EINVAL;
	295	else if (new_clusters == 0)
	296	return 0;
	297
	298	main_bm_inode = ocfs2_get_system_file_inode(osb,
	299	GLOBAL_BITMAP_SYSTEM_INODE,
	300	OCFS2_INVALID_SLOT);
	301	if (!main_bm_inode) {
	302	ret = -EINVAL;
	303	mlog_errno(ret);
	304	goto out;
	305	}
	306
	307	mutex_lock(&main_bm_inode->i_mutex);
	308
	309	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	310	if (ret < 0) {
	311	mlog_errno(ret);
	312	goto out_mutex;
	313	}
	314
	315	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	316
10995aa2 JB	317	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	318	* so any corruption is a code bug. */
	319	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
	320
d659072f TM	321	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
	322	ocfs2_group_bitmap_size(osb->sb) * 8) {
	323	mlog(ML_ERROR, "The disk is too old and small. "
	324	"Force to do offline resize.");
	325	ret = -EINVAL;
	326	goto out_unlock;
d659072f TM	327	}
	328
	329	first_new_cluster = le32_to_cpu(fe->i_clusters);
	330	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	331	first_new_cluster - 1);
	332
68f64d47 JB	333	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
68f64d47 JB	334	&group_bh);
d659072f TM	335	if (ret < 0) {
	336	mlog_errno(ret);
	337	goto out_unlock;
	338	}
d659072f TM	339	group = (struct ocfs2_group_desc *)group_bh->b_data;
d659072f TM	340
d659072f TM	341	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	342	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	343	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	344	ret = -EINVAL;
	345	goto out_unlock;
	346	}
	347
	348	mlog(0, "extend the last group at %llu, new clusters = %d\n",
7909f2bf	349	(unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
d659072f TM	350
	351	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	352	if (IS_ERR(handle)) {
	353	mlog_errno(PTR_ERR(handle));
	354	ret = -EINVAL;
	355	goto out_unlock;
	356	}
	357
	358	/* update the last group descriptor and inode. */
	359	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	360	main_bm_bh, group_bh,
	361	first_new_cluster,
	362	new_clusters);
	363	if (ret) {
	364	mlog_errno(ret);
	365	goto out_commit;
	366	}
	367
	368	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
	369
	370	out_commit:
	371	ocfs2_commit_trans(osb, handle);
	372	out_unlock:
2fe5c1d7 MF	373	brelse(group_bh);
2fe5c1d7 MF	374	brelse(main_bm_bh);
d659072f TM	375
	376	ocfs2_inode_unlock(main_bm_inode, 1);
	377
	378	out_mutex:
	379	mutex_unlock(&main_bm_inode->i_mutex);
	380	iput(main_bm_inode);
	381
	382	out:
	383	mlog_exit_void();
	384	return ret;
	385	}
7909f2bf TM	386
	387	static int ocfs2_check_new_group(struct inode *inode,
	388	struct ocfs2_dinode *di,
	389	struct ocfs2_new_group_input *input,
	390	struct buffer_head *group_bh)
	391	{
	392	int ret;
57e3e797 JB	393	struct ocfs2_group_desc *gd =
57e3e797 JB	394	(struct ocfs2_group_desc *)group_bh->b_data;
7909f2bf	395	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
7909f2bf	396
970e4936	397	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
57e3e797 JB	398	if (ret)
57e3e797 JB	399	goto out;
7909f2bf	400
57e3e797 JB	401	ret = -EINVAL;
57e3e797 JB	402	if (le16_to_cpu(gd->bg_chain) != input->chain)
7909f2bf TM	403	mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
	404	"while input has %u set.\n",
	405	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	406	le16_to_cpu(gd->bg_chain), input->chain);
	407	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
	408	mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
	409	"input has %u clusters set\n",
	410	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	411	le16_to_cpu(gd->bg_bits), input->clusters);
	412	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
	413	mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
	414	"but it should have %u set\n",
	415	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	416	le16_to_cpu(gd->bg_bits),
	417	input->frees * cl_bpc);
	418	else
	419	ret = 0;
	420
57e3e797	421	out:
7909f2bf TM	422	return ret;
	423	}
	424
	425	static int ocfs2_verify_group_and_input(struct inode *inode,
	426	struct ocfs2_dinode *di,
	427	struct ocfs2_new_group_input *input,
	428	struct buffer_head *group_bh)
	429	{
	430	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	431	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	432	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	433	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	434	u32 total_clusters = le32_to_cpu(di->i_clusters);
	435	int ret = -EINVAL;
	436
	437	if (cluster < total_clusters)
	438	mlog(ML_ERROR, "add a group which is in the current volume.\n");
	439	else if (input->chain >= cl_count)
	440	mlog(ML_ERROR, "input chain exceeds the limit.\n");
	441	else if (next_free != cl_count && next_free != input->chain)
	442	mlog(ML_ERROR,
	443	"the add group should be in chain %u\n", next_free);
	444	else if (total_clusters + input->clusters < total_clusters)
	445	mlog(ML_ERROR, "add group's clusters overflow.\n");
	446	else if (input->clusters > cl_cpg)
	447	mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	448	else if (input->frees > input->clusters)
	449	mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	450	else if (total_clusters % cl_cpg != 0)
	451	mlog(ML_ERROR,
	452	"the last group isn't full. Use group extend first.\n");
	453	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
	454	mlog(ML_ERROR, "group blkno is invalid\n");
	455	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
	456	mlog(ML_ERROR, "group descriptor check failed.\n");
	457	else
	458	ret = 0;
	459
	460	return ret;
	461	}
	462
	463	/* Add a new group descriptor to global_bitmap. */
	464	int ocfs2_group_add(struct inode inode, struct ocfs2_new_group_input input)
	465	{
	466	int ret;
	467	handle_t *handle;
	468	struct buffer_head *main_bm_bh = NULL;
	469	struct inode *main_bm_inode = NULL;
	470	struct ocfs2_dinode *fe = NULL;
	471	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	472	struct buffer_head *group_bh = NULL;
	473	struct ocfs2_group_desc *group = NULL;
	474	struct ocfs2_chain_list *cl;
	475	struct ocfs2_chain_rec *cr;
	476	u16 cl_bpc;
	477
	478	mlog_entry_void();
	479
	480	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	481	return -EROFS;
	482
	483	main_bm_inode = ocfs2_get_system_file_inode(osb,
	484	GLOBAL_BITMAP_SYSTEM_INODE,
	485	OCFS2_INVALID_SLOT);
486	if (!main_bm_inode) {
487	ret = -EINVAL;
488	mlog_errno(ret);
489	goto out;
490	}
491
492	mutex_lock(&main_bm_inode->i_mutex);
493
494	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
495	if (ret < 0) {
496	mlog_errno(ret);
497	goto out_mutex;
498	}
499
500	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
501
502	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
503	ocfs2_group_bitmap_size(osb->sb) * 8) {
504	mlog(ML_ERROR, "The disk is too old and small."
505	" Force to do offline resize.");
506	ret = -EINVAL;
507	goto out_unlock;
508	}
509
da1e9098	510	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
7909f2bf TM	511	if (ret < 0) {
	512	mlog(ML_ERROR, "Can't read the group descriptor # %llu "
	513	"from the device.", (unsigned long long)input->group);
	514	goto out_unlock;
	515	}
	516
	517	ocfs2_set_new_buffer_uptodate(inode, group_bh);
	518
	519	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	520	if (ret) {
	521	mlog_errno(ret);
	522	goto out_unlock;
	523	}
	524
	525	mlog(0, "Add a new group %llu in chain = %u, length = %u\n",
	526	(unsigned long long)input->group, input->chain, input->clusters);
	527
	528	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	529	if (IS_ERR(handle)) {
	530	mlog_errno(PTR_ERR(handle));
	531	ret = -EINVAL;
	532	goto out_unlock;
	533	}
	534
	535	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	536	cl = &fe->id2.i_chain;
	537	cr = &cl->cl_recs[input->chain];
	538
13723d00 JB	539	ret = ocfs2_journal_access_gd(handle, main_bm_inode, group_bh,
13723d00 JB	540	OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	541	if (ret < 0) {
	542	mlog_errno(ret);
	543	goto out_commit;
	544	}
	545
	546	group = (struct ocfs2_group_desc *)group_bh->b_data;
	547	group->bg_next_group = cr->c_blkno;
	548
	549	ret = ocfs2_journal_dirty(handle, group_bh);
	550	if (ret < 0) {
	551	mlog_errno(ret);
	552	goto out_commit;
	553	}
	554
13723d00 JB	555	ret = ocfs2_journal_access_di(handle, main_bm_inode, main_bm_bh,
13723d00 JB	556	OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	557	if (ret < 0) {
	558	mlog_errno(ret);
	559	goto out_commit;
	560	}
	561
	562	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
	563	le16_add_cpu(&cl->cl_next_free_rec, 1);
	564	memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	565	}
	566
4338ab6a	567	cr->c_blkno = cpu_to_le64(input->group);
7909f2bf TM	568	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	569	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
	570
	571	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	572	le32_add_cpu(&fe->id1.bitmap1.i_used,
	573	(input->clusters - input->frees) * cl_bpc);
	574	le32_add_cpu(&fe->i_clusters, input->clusters);
	575
	576	ocfs2_journal_dirty(handle, main_bm_bh);
	577
	578	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	579	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	580	le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
	581	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	582	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
	583
	584	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
	585
	586	out_commit:
	587	ocfs2_commit_trans(osb, handle);
	588	out_unlock:
2fe5c1d7 MF	589	brelse(group_bh);
2fe5c1d7 MF	590	brelse(main_bm_bh);
7909f2bf TM	591
	592	ocfs2_inode_unlock(main_bm_inode, 1);
	593
	594	out_mutex:
	595	mutex_unlock(&main_bm_inode->i_mutex);
	596	iput(main_bm_inode);
	597
	598	out:
	599	mlog_exit_void();
	600	return ret;
	601	}