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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * resize.c
 *
 * volume resize.
 * Inspired by ext3/resize.c.
 *
 * Copyright (C) 2007 Oracle.  All rights reserved.
 */

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

#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "dlmglue.h"
#include "inode.h"
#include "journal.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "ocfs2_trace.h"

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

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

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

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

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

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

	return backups;
}

static int ocfs2_update_last_group_and_inode(handle_t *handle,
					     struct inode *bm_inode,
					     struct buffer_head *bm_bh,
					     struct buffer_head *group_bh,
					     u32 first_new_cluster,
					     int new_clusters)
{
	int ret = 0;
	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
	struct ocfs2_chain_rec *cr;
	struct ocfs2_group_desc *group;
	u16 chain, num_bits, backups = 0;
	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
	u16 old_bg_clusters;
	u16 contig_bits;
	__le16 old_bg_contig_free_bits;

	trace_ocfs2_update_last_group_and_inode(new_clusters,
						first_new_cluster);

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

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

	old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
	/* update the group first. */
	num_bits = new_clusters * cl_bpc;
	le16_add_cpu(&group->bg_bits, num_bits);
	le16_add_cpu(&group->bg_free_bits_count, num_bits);

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

	contig_bits = ocfs2_find_max_contig_free_bits(group->bg_bitmap,
					le16_to_cpu(group->bg_bits), 0);
	old_bg_contig_free_bits = group->bg_contig_free_bits;
	group->bg_contig_free_bits = cpu_to_le16(contig_bits);

	ocfs2_journal_dirty(handle, group_bh);

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

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

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

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

	ocfs2_journal_dirty(handle, bm_bh);

out_rollback:
	if (ret < 0) {
		ocfs2_calc_new_backup_super(bm_inode,
					    group,
					    cl_cpg, old_bg_clusters, 0);
		le16_add_cpu(&group->bg_free_bits_count, backups);
		le16_add_cpu(&group->bg_bits, -1 * num_bits);
		le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
		group->bg_contig_free_bits = old_bg_contig_free_bits;
	}
out:
	if (ret)
		mlog_errno(ret);
	return ret;
}

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

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

		ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
		if (ret < 0) {
			mlog_errno(ret);
			break;
		}

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

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

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

	return ret;
}

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

	/*
	 * update the superblock last.
	 * It doesn't matter if the write failed.
	 */
	ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
				     &super_bh);
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

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

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

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

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

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

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

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

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

	inode_lock(main_bm_inode);

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

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

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

	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
		ocfs2_group_bitmap_size(osb->sb, 0,
					osb->s_feature_incompat) * 8) {
		mlog(ML_ERROR, "The disk is too old and small. "
		     "Force to do offline resize.");
		ret = -EINVAL;
		goto out_unlock;
	}

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

	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
					  &group_bh);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}
	group = (struct ocfs2_group_desc *)group_bh->b_data;

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


	trace_ocfs2_group_extend(
	     (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);

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

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

	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);

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

	ocfs2_inode_unlock(main_bm_inode, 1);

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

out:
	return ret;
}

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

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

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

out:
	return ret;
}

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

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

	return ret;
}

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

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

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

	inode_lock(main_bm_inode);

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

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

	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
		ocfs2_group_bitmap_size(osb->sb, 0,
					osb->s_feature_incompat) * 8) {
		mlog(ML_ERROR, "The disk is too old and small."
		     " Force to do offline resize.");
		ret = -EINVAL;
		goto out_unlock;
	}

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

	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);

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

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

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

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

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

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

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

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

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

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

	ocfs2_journal_dirty(handle, main_bm_bh);

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

	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);

out_commit:
	ocfs2_commit_trans(osb, handle);

out_free_group_bh:
	brelse(group_bh);

out_unlock:
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

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

out:
	return ret;
}
Commit	Line	Data
328970de	1	// SPDX-License-Identifier: GPL-2.0-or-later
fa60ce2c	2	/*
d659072f TM	3	* resize.c
	4	*
	5	* volume resize.
	6	* Inspired by ext3/resize.c.
	7	*
	8	* Copyright (C) 2007 Oracle. All rights reserved.
d659072f TM	9	*/
	10
	11	#include <linux/fs.h>
	12	#include <linux/types.h>
	13
d659072f TM	14	#include <cluster/masklog.h>
	15
	16	#include "ocfs2.h"
	17
	18	#include "alloc.h"
	19	#include "dlmglue.h"
	20	#include "inode.h"
	21	#include "journal.h"
	22	#include "super.h"
	23	#include "sysfile.h"
	24	#include "uptodate.h"
a5438702	25	#include "ocfs2_trace.h"
d659072f TM	26
	27	#include "buffer_head_io.h"
	28	#include "suballoc.h"
	29	#include "resize.h"
	30
	31	/*
	32	* Check whether there are new backup superblocks exist
	33	* in the last group. If there are some, mark them or clear
	34	* them in the bitmap.
	35	*
	36	* Return how many backups we find in the last group.
	37	*/
	38	static u16 ocfs2_calc_new_backup_super(struct inode *inode,
	39	struct ocfs2_group_desc *gd,
d659072f	40	u16 cl_cpg,
5c9ee4cb	41	u16 old_bg_clusters,
d659072f TM	42	int set)
	43	{
	44	int i;
	45	u16 backups = 0;
5c9ee4cb	46	u32 cluster, lgd_cluster;
d659072f TM	47	u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
	48
	49	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	50	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	51	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
	52
	53	gd_blkno = ocfs2_which_cluster_group(inode, cluster);
	54	if (gd_blkno < lgd_blkno)
	55	continue;
	56	else if (gd_blkno > lgd_blkno)
	57	break;
	58
5c9ee4cb JQ	59	/* check if already done backup super */
	60	lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
	61	lgd_cluster += old_bg_clusters;
	62	if (lgd_cluster >= cluster)
	63	continue;
	64
d659072f TM	65	if (set)
	66	ocfs2_set_bit(cluster % cl_cpg,
	67	(unsigned long *)gd->bg_bitmap);
	68	else
	69	ocfs2_clear_bit(cluster % cl_cpg,
	70	(unsigned long *)gd->bg_bitmap);
	71	backups++;
	72	}
	73
d659072f TM	74	return backups;
	75	}
	76
	77	static int ocfs2_update_last_group_and_inode(handle_t *handle,
	78	struct inode *bm_inode,
	79	struct buffer_head *bm_bh,
	80	struct buffer_head *group_bh,
	81	u32 first_new_cluster,
	82	int new_clusters)
	83	{
	84	int ret = 0;
	85	struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
	86	struct ocfs2_dinode fe = (struct ocfs2_dinode ) bm_bh->b_data;
	87	struct ocfs2_chain_list *cl = &fe->id2.i_chain;
	88	struct ocfs2_chain_rec *cr;
	89	struct ocfs2_group_desc *group;
	90	u16 chain, num_bits, backups = 0;
	91	u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
	92	u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
5c9ee4cb	93	u16 old_bg_clusters;
4eb7b93e HZ	94	u16 contig_bits;
4eb7b93e HZ	95	__le16 old_bg_contig_free_bits;
d659072f	96
a5438702 TM	97	trace_ocfs2_update_last_group_and_inode(new_clusters,
a5438702 TM	98	first_new_cluster);
d659072f	99
0cf2f763 JB	100	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
0cf2f763 JB	101	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	102	if (ret < 0) {
	103	mlog_errno(ret);
	104	goto out;
	105	}
	106
	107	group = (struct ocfs2_group_desc *)group_bh->b_data;
	108
5c9ee4cb	109	old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
d659072f TM	110	/* update the group first. */
	111	num_bits = new_clusters * cl_bpc;
	112	le16_add_cpu(&group->bg_bits, num_bits);
	113	le16_add_cpu(&group->bg_free_bits_count, num_bits);
	114
	115	/*
	116	* check whether there are some new backup superblocks exist in
	117	* this group and update the group bitmap accordingly.
	118	*/
	119	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
	120	OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
	121	backups = ocfs2_calc_new_backup_super(bm_inode,
	122	group,
5c9ee4cb	123	cl_cpg, old_bg_clusters, 1);
d659072f TM	124	le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
	125	}
	126
4eb7b93e HZ	127	contig_bits = ocfs2_find_max_contig_free_bits(group->bg_bitmap,
	128	le16_to_cpu(group->bg_bits), 0);
	129	old_bg_contig_free_bits = group->bg_contig_free_bits;
	130	group->bg_contig_free_bits = cpu_to_le16(contig_bits);
	131
ec20cec7	132	ocfs2_journal_dirty(handle, group_bh);
d659072f TM	133
d659072f TM	134	/* update the inode accordingly. */
0cf2f763	135	ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
13723d00	136	OCFS2_JOURNAL_ACCESS_WRITE);
d659072f TM	137	if (ret < 0) {
	138	mlog_errno(ret);
	139	goto out_rollback;
	140	}
	141
	142	chain = le16_to_cpu(group->bg_chain);
	143	cr = (&cl->cl_recs[chain]);
	144	le32_add_cpu(&cr->c_total, num_bits);
	145	le32_add_cpu(&cr->c_free, num_bits);
	146	le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
	147	le32_add_cpu(&fe->i_clusters, new_clusters);
	148
	149	if (backups) {
	150	le32_add_cpu(&cr->c_free, -1 * backups);
	151	le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
	152	}
	153
	154	spin_lock(&OCFS2_I(bm_inode)->ip_lock);
	155	OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
17bf1418	156	le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
d659072f TM	157	spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
	158	i_size_write(bm_inode, le64_to_cpu(fe->i_size));
	159
	160	ocfs2_journal_dirty(handle, bm_bh);
	161
	162	out_rollback:
	163	if (ret < 0) {
	164	ocfs2_calc_new_backup_super(bm_inode,
	165	group,
5c9ee4cb	166	cl_cpg, old_bg_clusters, 0);
d659072f TM	167	le16_add_cpu(&group->bg_free_bits_count, backups);
	168	le16_add_cpu(&group->bg_bits, -1 * num_bits);
	169	le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
4eb7b93e	170	group->bg_contig_free_bits = old_bg_contig_free_bits;
d659072f TM	171	}
d659072f TM	172	out:
c1e8d35e TM	173	if (ret)
c1e8d35e TM	174	mlog_errno(ret);
d659072f TM	175	return ret;
	176	}
	177
	178	static int update_backups(struct inode * inode, u32 clusters, char *data)
	179	{
	180	int i, ret = 0;
	181	u32 cluster;
	182	u64 blkno;
	183	struct buffer_head *backup = NULL;
	184	struct ocfs2_dinode *backup_di = NULL;
	185	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	186
	187	/* calculate the real backups we need to update. */
	188	for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
	189	blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
	190	cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
584dca34	191	if (cluster >= clusters)
d659072f TM	192	break;
d659072f TM	193
da1e9098	194	ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
d659072f TM	195	if (ret < 0) {
	196	mlog_errno(ret);
	197	break;
	198	}
	199
	200	memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
	201
	202	backup_di = (struct ocfs2_dinode *)backup->b_data;
	203	backup_di->i_blkno = cpu_to_le64(blkno);
	204
	205	ret = ocfs2_write_super_or_backup(osb, backup);
	206	brelse(backup);
	207	backup = NULL;
	208	if (ret < 0) {
	209	mlog_errno(ret);
	210	break;
	211	}
	212	}
	213
	214	return ret;
	215	}
	216
	217	static void ocfs2_update_super_and_backups(struct inode *inode,
	218	int new_clusters)
	219	{
	220	int ret;
	221	u32 clusters = 0;
	222	struct buffer_head *super_bh = NULL;
	223	struct ocfs2_dinode *super_di = NULL;
	224	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	225
	226	/*
	227	* update the superblock last.
	228	* It doesn't matter if the write failed.
	229	*/
da1e9098 JB	230	ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
da1e9098 JB	231	&super_bh);
d659072f TM	232	if (ret < 0) {
	233	mlog_errno(ret);
	234	goto out;
	235	}
	236
	237	super_di = (struct ocfs2_dinode *)super_bh->b_data;
	238	le32_add_cpu(&super_di->i_clusters, new_clusters);
	239	clusters = le32_to_cpu(super_di->i_clusters);
	240
	241	ret = ocfs2_write_super_or_backup(osb, super_bh);
	242	if (ret < 0) {
	243	mlog_errno(ret);
	244	goto out;
	245	}
	246
	247	if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
	248	ret = update_backups(inode, clusters, super_bh->b_data);
	249
	250	out:
2fe5c1d7	251	brelse(super_bh);
d659072f TM	252	if (ret)
	253	printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
	254	" during fs resize. This condition is not fatal,"
	255	" but fsck.ocfs2 should be run to fix it\n",
	256	osb->dev_str);
	257	return;
	258	}
	259
	260	/*
	261	* Extend the filesystem to the new number of clusters specified. This entry
	262	* point is only used to extend the current filesystem to the end of the last
	263	* existing group.
	264	*/
	265	int ocfs2_group_extend(struct inode * inode, int new_clusters)
	266	{
	267	int ret;
	268	handle_t *handle;
	269	struct buffer_head *main_bm_bh = NULL;
	270	struct buffer_head *group_bh = NULL;
	271	struct inode *main_bm_inode = NULL;
	272	struct ocfs2_dinode *fe = NULL;
	273	struct ocfs2_group_desc *group = NULL;
	274	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	275	u16 cl_bpc;
	276	u32 first_new_cluster;
	277	u64 lgd_blkno;
	278
d659072f TM	279	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	280	return -EROFS;
	281
	282	if (new_clusters < 0)
	283	return -EINVAL;
	284	else if (new_clusters == 0)
	285	return 0;
	286
	287	main_bm_inode = ocfs2_get_system_file_inode(osb,
	288	GLOBAL_BITMAP_SYSTEM_INODE,
	289	OCFS2_INVALID_SLOT);
	290	if (!main_bm_inode) {
	291	ret = -EINVAL;
	292	mlog_errno(ret);
	293	goto out;
	294	}
	295
5955102c	296	inode_lock(main_bm_inode);
d659072f TM	297
	298	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	299	if (ret < 0) {
	300	mlog_errno(ret);
	301	goto out_mutex;
	302	}
	303
	304	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	305
10995aa2 JB	306	/* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
	307	* so any corruption is a code bug. */
	308	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
	309
d659072f	310	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	311	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	312	osb->s_feature_incompat) * 8) {
d659072f TM	313	mlog(ML_ERROR, "The disk is too old and small. "
	314	"Force to do offline resize.");
	315	ret = -EINVAL;
	316	goto out_unlock;
d659072f TM	317	}
	318
	319	first_new_cluster = le32_to_cpu(fe->i_clusters);
	320	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
	321	first_new_cluster - 1);
	322
68f64d47 JB	323	ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
68f64d47 JB	324	&group_bh);
d659072f TM	325	if (ret < 0) {
	326	mlog_errno(ret);
	327	goto out_unlock;
	328	}
d659072f TM	329	group = (struct ocfs2_group_desc *)group_bh->b_data;
d659072f TM	330
d659072f TM	331	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	332	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
	333	le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
	334	ret = -EINVAL;
	335	goto out_unlock;
	336	}
	337
a5438702 TM	338
a5438702 TM	339	trace_ocfs2_group_extend(
7909f2bf	340	(unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
d659072f TM	341
	342	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	343	if (IS_ERR(handle)) {
	344	mlog_errno(PTR_ERR(handle));
	345	ret = -EINVAL;
	346	goto out_unlock;
	347	}
	348
	349	/* update the last group descriptor and inode. */
	350	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
	351	main_bm_bh, group_bh,
	352	first_new_cluster,
	353	new_clusters);
	354	if (ret) {
	355	mlog_errno(ret);
	356	goto out_commit;
	357	}
	358
	359	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
	360
	361	out_commit:
	362	ocfs2_commit_trans(osb, handle);
	363	out_unlock:
2fe5c1d7 MF	364	brelse(group_bh);
2fe5c1d7 MF	365	brelse(main_bm_bh);
d659072f TM	366
	367	ocfs2_inode_unlock(main_bm_inode, 1);
	368
	369	out_mutex:
5955102c	370	inode_unlock(main_bm_inode);
d659072f TM	371	iput(main_bm_inode);
	372
	373	out:
d659072f TM	374	return ret;
d659072f TM	375	}
7909f2bf TM	376
	377	static int ocfs2_check_new_group(struct inode *inode,
	378	struct ocfs2_dinode *di,
	379	struct ocfs2_new_group_input *input,
	380	struct buffer_head *group_bh)
	381	{
	382	int ret;
57e3e797 JB	383	struct ocfs2_group_desc *gd =
57e3e797 JB	384	(struct ocfs2_group_desc *)group_bh->b_data;
7909f2bf	385	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
7909f2bf	386
970e4936	387	ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
57e3e797 JB	388	if (ret)
57e3e797 JB	389	goto out;
7909f2bf	390
57e3e797 JB	391	ret = -EINVAL;
57e3e797 JB	392	if (le16_to_cpu(gd->bg_chain) != input->chain)
7909f2bf TM	393	mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
	394	"while input has %u set.\n",
	395	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	396	le16_to_cpu(gd->bg_chain), input->chain);
	397	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
	398	mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
	399	"input has %u clusters set\n",
	400	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	401	le16_to_cpu(gd->bg_bits), input->clusters);
	402	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
	403	mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
	404	"but it should have %u set\n",
	405	(unsigned long long)le64_to_cpu(gd->bg_blkno),
	406	le16_to_cpu(gd->bg_bits),
	407	input->frees * cl_bpc);
	408	else
	409	ret = 0;
	410
57e3e797	411	out:
7909f2bf TM	412	return ret;
	413	}
	414
	415	static int ocfs2_verify_group_and_input(struct inode *inode,
	416	struct ocfs2_dinode *di,
	417	struct ocfs2_new_group_input *input,
	418	struct buffer_head *group_bh)
	419	{
	420	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	421	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	422	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	423	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	424	u32 total_clusters = le32_to_cpu(di->i_clusters);
	425	int ret = -EINVAL;
	426
	427	if (cluster < total_clusters)
	428	mlog(ML_ERROR, "add a group which is in the current volume.\n");
	429	else if (input->chain >= cl_count)
	430	mlog(ML_ERROR, "input chain exceeds the limit.\n");
	431	else if (next_free != cl_count && next_free != input->chain)
	432	mlog(ML_ERROR,
	433	"the add group should be in chain %u\n", next_free);
	434	else if (total_clusters + input->clusters < total_clusters)
	435	mlog(ML_ERROR, "add group's clusters overflow.\n");
	436	else if (input->clusters > cl_cpg)
	437	mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	438	else if (input->frees > input->clusters)
	439	mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	440	else if (total_clusters % cl_cpg != 0)
	441	mlog(ML_ERROR,
	442	"the last group isn't full. Use group extend first.\n");
	443	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
	444	mlog(ML_ERROR, "group blkno is invalid\n");
	445	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
	446	mlog(ML_ERROR, "group descriptor check failed.\n");
	447	else
	448	ret = 0;
	449
	450	return ret;
	451	}
	452
	453	/* Add a new group descriptor to global_bitmap. */
	454	int ocfs2_group_add(struct inode inode, struct ocfs2_new_group_input input)
	455	{
	456	int ret;
	457	handle_t *handle;
	458	struct buffer_head *main_bm_bh = NULL;
	459	struct inode *main_bm_inode = NULL;
	460	struct ocfs2_dinode *fe = NULL;
	461	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	462	struct buffer_head *group_bh = NULL;
	463	struct ocfs2_group_desc *group = NULL;
	464	struct ocfs2_chain_list *cl;
	465	struct ocfs2_chain_rec *cr;
	466	u16 cl_bpc;
eedd40e1	467	u64 bg_ptr;
7909f2bf	468
7909f2bf TM	469	if (ocfs2_is_hard_readonly(osb) \|\| ocfs2_is_soft_readonly(osb))
	470	return -EROFS;
	471
	472	main_bm_inode = ocfs2_get_system_file_inode(osb,
	473	GLOBAL_BITMAP_SYSTEM_INODE,
	474	OCFS2_INVALID_SLOT);
	475	if (!main_bm_inode) {
	476	ret = -EINVAL;
	477	mlog_errno(ret);
	478	goto out;
	479	}
	480
5955102c	481	inode_lock(main_bm_inode);
7909f2bf TM	482
	483	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	484	if (ret < 0) {
	485	mlog_errno(ret);
	486	goto out_mutex;
	487	}
	488
	489	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
	490
	491	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
8571882c TM	492	ocfs2_group_bitmap_size(osb->sb, 0,
8571882c TM	493	osb->s_feature_incompat) * 8) {
7909f2bf TM	494	mlog(ML_ERROR, "The disk is too old and small."
	495	" Force to do offline resize.");
	496	ret = -EINVAL;
	497	goto out_unlock;
	498	}
	499
da1e9098	500	ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
7909f2bf TM	501	if (ret < 0) {
	502	mlog(ML_ERROR, "Can't read the group descriptor # %llu "
	503	"from the device.", (unsigned long long)input->group);
	504	goto out_unlock;
	505	}
	506
8cb471e8	507	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
7909f2bf TM	508
	509	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	510	if (ret) {
	511	mlog_errno(ret);
8abaae8d	512	goto out_free_group_bh;
7909f2bf TM	513	}
7909f2bf TM	514
a5438702 TM	515	trace_ocfs2_group_add((unsigned long long)input->group,
a5438702 TM	516	input->chain, input->clusters, input->frees);
7909f2bf TM	517
	518	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	519	if (IS_ERR(handle)) {
	520	mlog_errno(PTR_ERR(handle));
	521	ret = -EINVAL;
8abaae8d	522	goto out_free_group_bh;
7909f2bf TM	523	}
	524
	525	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	526	cl = &fe->id2.i_chain;
	527	cr = &cl->cl_recs[input->chain];
	528
0cf2f763 JB	529	ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	530	group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf TM	531	if (ret < 0) {
	532	mlog_errno(ret);
	533	goto out_commit;
	534	}
	535
	536	group = (struct ocfs2_group_desc *)group_bh->b_data;
eedd40e1	537	bg_ptr = le64_to_cpu(group->bg_next_group);
7909f2bf	538	group->bg_next_group = cr->c_blkno;
ec20cec7	539	ocfs2_journal_dirty(handle, group_bh);
7909f2bf	540
0cf2f763 JB	541	ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
0cf2f763 JB	542	main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
7909f2bf	543	if (ret < 0) {
eedd40e1	544	group->bg_next_group = cpu_to_le64(bg_ptr);
7909f2bf TM	545	mlog_errno(ret);
	546	goto out_commit;
	547	}
	548
	549	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
	550	le16_add_cpu(&cl->cl_next_free_rec, 1);
	551	memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	552	}
	553
4338ab6a	554	cr->c_blkno = cpu_to_le64(input->group);
7909f2bf TM	555	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	556	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
	557
	558	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	559	le32_add_cpu(&fe->id1.bitmap1.i_used,
	560	(input->clusters - input->frees) * cl_bpc);
	561	le32_add_cpu(&fe->i_clusters, input->clusters);
	562
	563	ocfs2_journal_dirty(handle, main_bm_bh);
	564
	565	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	566	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
17bf1418	567	le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
7909f2bf TM	568	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	569	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
	570
	571	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
	572
	573	out_commit:
	574	ocfs2_commit_trans(osb, handle);
8abaae8d YL	575
8abaae8d YL	576	out_free_group_bh:
2fe5c1d7	577	brelse(group_bh);
8abaae8d YL	578
8abaae8d YL	579	out_unlock:
2fe5c1d7	580	brelse(main_bm_bh);
7909f2bf TM	581
	582	ocfs2_inode_unlock(main_bm_inode, 1);
	583
	584	out_mutex:
5955102c	585	inode_unlock(main_bm_inode);
7909f2bf TM	586	iput(main_bm_inode);
	587
	588	out:
7909f2bf TM	589	return ret;
7909f2bf TM	590	}