From d659072f736837e56b6433d58e5315ad1d4d5ccf Mon Sep 17 00:00:00 2001 From: Tao Ma Date: Tue, 18 Dec 2007 15:47:03 +0800 Subject: [PATCH 1/2] ocfs2: Add group extend for online resize This patch adds the ability for a userspace program to request an extend of last cluster group on an Ocfs2 file system. The request is made via ioctl, OCFS2_IOC_GROUP_EXTEND. This is derived from EXT3_IOC_GROUP_EXTEND, but is obviously Ocfs2 specific. tunefs.ocfs2 would call this for an online-resize operation if the last cluster group isn't full. Signed-off-by: Tao Ma Signed-off-by: Mark Fasheh --- fs/ocfs2/resize.c | 398 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 398 insertions(+) create mode 100644 fs/ocfs2/resize.c (limited to 'fs/ocfs2/resize.c') diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c new file mode 100644 index 000000000000..848f7293f4fc --- /dev/null +++ b/fs/ocfs2/resize.c @@ -0,0 +1,398 @@ +/* -*- 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 +#include + +#define MLOG_MASK_PREFIX ML_DISK_ALLOC +#include + +#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; +} -- cgit v1.2.3