/* -*- 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(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(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_block(osb, blkno, &backup, 0, NULL);
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_block(osb, OCFS2_SUPER_BLOCK_BLKNO,
&super_bh, 0, NULL);
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:
if (super_bh)
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;
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;
}
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(main_bm_inode->i_sb, fe);
ret = -EIO;
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_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
main_bm_inode);
if (ret < 0) {
mlog_errno(ret);
goto out_unlock;
}
group = (struct ocfs2_group_desc *)group_bh->b_data;
ret = ocfs2_check_group_descriptor(inode->i_sb, fe, group);
if (ret) {
mlog_errno(ret);
goto out_unlock;
}
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",
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:
if (group_bh)
brelse(group_bh);
if (main_bm_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;
}
