544 строки
15 KiB
C
544 строки
15 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_metapage.h"
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#include "jfs_dinode.h"
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#include "jfs_imap.h"
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#include "jfs_dmap.h"
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#include "jfs_superblock.h"
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#include "jfs_txnmgr.h"
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#include "jfs_debug.h"
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#define BITSPERPAGE (PSIZE << 3)
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#define L2MEGABYTE 20
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#define MEGABYTE (1 << L2MEGABYTE)
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#define MEGABYTE32 (MEGABYTE << 5)
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/* convert block number to bmap file page number */
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#define BLKTODMAPN(b)\
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(((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
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/*
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* jfs_extendfs()
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*
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* function: extend file system;
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*
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* |-------------------------------|----------|----------|
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* file system space fsck inline log
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* workspace space
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*
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* input:
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* new LVSize: in LV blocks (required)
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* new LogSize: in LV blocks (optional)
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* new FSSize: in LV blocks (optional)
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*
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* new configuration:
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* 1. set new LogSize as specified or default from new LVSize;
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* 2. compute new FSCKSize from new LVSize;
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* 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
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* assert(new FSSize >= old FSSize),
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* i.e., file system must not be shrunk;
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*/
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int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
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{
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int rc = 0;
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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struct inode *ipbmap = sbi->ipbmap;
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struct inode *ipbmap2;
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struct inode *ipimap = sbi->ipimap;
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struct jfs_log *log = sbi->log;
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struct bmap *bmp = sbi->bmap;
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s64 newLogAddress, newFSCKAddress;
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int newFSCKSize;
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s64 newMapSize = 0, mapSize;
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s64 XAddress, XSize, nblocks, xoff, xaddr, t64;
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s64 oldLVSize;
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s64 newFSSize;
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s64 VolumeSize;
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int newNpages = 0, nPages, newPage, xlen, t32;
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int tid;
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int log_formatted = 0;
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struct inode *iplist[1];
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struct jfs_superblock *j_sb, *j_sb2;
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uint old_agsize;
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int agsizechanged = 0;
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struct buffer_head *bh, *bh2;
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/* If the volume hasn't grown, get out now */
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if (sbi->mntflag & JFS_INLINELOG)
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oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
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else
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oldLVSize = addressPXD(&sbi->fsckpxd) +
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lengthPXD(&sbi->fsckpxd);
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if (oldLVSize >= newLVSize) {
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printk(KERN_WARNING
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"jfs_extendfs: volume hasn't grown, returning\n");
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goto out;
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}
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VolumeSize = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
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if (VolumeSize) {
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if (newLVSize > VolumeSize) {
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printk(KERN_WARNING "jfs_extendfs: invalid size\n");
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rc = -EINVAL;
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goto out;
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}
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} else {
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/* check the device */
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bh = sb_bread(sb, newLVSize - 1);
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if (!bh) {
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printk(KERN_WARNING "jfs_extendfs: invalid size\n");
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rc = -EINVAL;
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goto out;
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}
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bforget(bh);
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}
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/* Can't extend write-protected drive */
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if (isReadOnly(ipbmap)) {
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printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
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rc = -EROFS;
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goto out;
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}
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/*
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* reconfigure LV spaces
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* ---------------------
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*
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* validate new size, or, if not specified, determine new size
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*/
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/*
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* reconfigure inline log space:
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*/
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if ((sbi->mntflag & JFS_INLINELOG)) {
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if (newLogSize == 0) {
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/*
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* no size specified: default to 1/256 of aggregate
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* size; rounded up to a megabyte boundary;
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*/
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newLogSize = newLVSize >> 8;
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t32 = (1 << (20 - sbi->l2bsize)) - 1;
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newLogSize = (newLogSize + t32) & ~t32;
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newLogSize =
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min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
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} else {
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/*
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* convert the newLogSize to fs blocks.
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*
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* Since this is given in megabytes, it will always be
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* an even number of pages.
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*/
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newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
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}
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} else
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newLogSize = 0;
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newLogAddress = newLVSize - newLogSize;
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/*
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* reconfigure fsck work space:
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*
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* configure it to the end of the logical volume regardless of
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* whether file system extends to the end of the aggregate;
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* Need enough 4k pages to cover:
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* - 1 bit per block in aggregate rounded up to BPERDMAP boundary
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* - 1 extra page to handle control page and intermediate level pages
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* - 50 extra pages for the chkdsk service log
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*/
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t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
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<< L2BPERDMAP;
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t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50;
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newFSCKSize = t32 << sbi->l2nbperpage;
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newFSCKAddress = newLogAddress - newFSCKSize;
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/*
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* compute new file system space;
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*/
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newFSSize = newLVSize - newLogSize - newFSCKSize;
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/* file system cannot be shrunk */
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if (newFSSize < bmp->db_mapsize) {
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rc = -EINVAL;
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goto out;
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}
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/*
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* If we're expanding enough that the inline log does not overlap
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* the old one, we can format the new log before we quiesce the
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* filesystem.
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*/
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if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
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if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
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goto out;
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log_formatted = 1;
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}
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/*
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* quiesce file system
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*
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* (prepare to move the inline log and to prevent map update)
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*
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* block any new transactions and wait for completion of
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* all wip transactions and flush modified pages s.t.
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* on-disk file system is in consistent state and
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* log is not required for recovery.
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*/
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txQuiesce(sb);
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/* Reset size of direct inode */
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sbi->direct_inode->i_size = sb->s_bdev->bd_inode->i_size;
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if (sbi->mntflag & JFS_INLINELOG) {
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/*
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* deactivate old inline log
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*/
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lmLogShutdown(log);
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/*
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* mark on-disk super block for fs in transition;
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*
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* update on-disk superblock for the new space configuration
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* of inline log space and fsck work space descriptors:
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* N.B. FS descriptor is NOT updated;
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*
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* crash recovery:
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* logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
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* fsck(): if FM_EXTENDFS, reformat inline log and fsck
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* workspace from superblock inline log descriptor and fsck
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* workspace descriptor;
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*/
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/* read in superblock */
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if ((rc = readSuper(sb, &bh)))
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goto error_out;
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j_sb = (struct jfs_superblock *)bh->b_data;
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/* mark extendfs() in progress */
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j_sb->s_state |= cpu_to_le32(FM_EXTENDFS);
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j_sb->s_xsize = cpu_to_le64(newFSSize);
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PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
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PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
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PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
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PXDlength(&j_sb->s_xlogpxd, newLogSize);
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/* synchronously update superblock */
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mark_buffer_dirty(bh);
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sync_dirty_buffer(bh);
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brelse(bh);
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/*
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* format new inline log synchronously;
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*
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* crash recovery: if log move in progress,
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* reformat log and exit success;
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*/
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if (!log_formatted)
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if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
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goto error_out;
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/*
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* activate new log
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*/
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log->base = newLogAddress;
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log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
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if ((rc = lmLogInit(log)))
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goto error_out;
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}
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/*
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* extend block allocation map
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* ---------------------------
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*
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* extendfs() for new extension, retry after crash recovery;
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*
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* note: both logredo() and fsck() rebuild map from
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* the bitmap and configuration parameter from superblock
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* (disregarding all other control information in the map);
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*
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* superblock:
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* s_size: aggregate size in physical blocks;
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*/
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/*
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* compute the new block allocation map configuration
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*
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* map dinode:
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* di_size: map file size in byte;
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* di_nblocks: number of blocks allocated for map file;
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* di_mapsize: number of blocks in aggregate (covered by map);
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* map control page:
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* db_mapsize: number of blocks in aggregate (covered by map);
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*/
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newMapSize = newFSSize;
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/* number of data pages of new bmap file:
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* roundup new size to full dmap page boundary and
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* add 1 extra dmap page for next extendfs()
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*/
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t64 = (newMapSize - 1) + BPERDMAP;
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newNpages = BLKTODMAPN(t64) + 1;
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/*
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* extend map from current map (WITHOUT growing mapfile)
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*
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* map new extension with unmapped part of the last partial
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* dmap page, if applicable, and extra page(s) allocated
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* at end of bmap by mkfs() or previous extendfs();
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*/
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extendBmap:
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/* compute number of blocks requested to extend */
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mapSize = bmp->db_mapsize;
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XAddress = mapSize; /* eXtension Address */
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XSize = newMapSize - mapSize; /* eXtension Size */
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old_agsize = bmp->db_agsize; /* We need to know if this changes */
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/* compute number of blocks that can be extended by current mapfile */
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t64 = dbMapFileSizeToMapSize(ipbmap);
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if (mapSize > t64) {
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printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
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(long long) mapSize, (long long) t64);
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rc = -EIO;
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goto error_out;
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}
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nblocks = min(t64 - mapSize, XSize);
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/*
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* update map pages for new extension:
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*
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* update/init dmap and bubble up the control hierarchy
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* incrementally fold up dmaps into upper levels;
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* update bmap control page;
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*/
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if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
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goto error_out;
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agsizechanged |= (bmp->db_agsize != old_agsize);
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/*
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* the map now has extended to cover additional nblocks:
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* dn_mapsize = oldMapsize + nblocks;
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*/
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/* ipbmap->i_mapsize += nblocks; */
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XSize -= nblocks;
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/*
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* grow map file to cover remaining extension
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* and/or one extra dmap page for next extendfs();
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*
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* allocate new map pages and its backing blocks, and
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* update map file xtree
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*/
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/* compute number of data pages of current bmap file */
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nPages = ipbmap->i_size >> L2PSIZE;
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/* need to grow map file ? */
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if (nPages == newNpages)
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goto finalizeBmap;
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/*
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* grow bmap file for the new map pages required:
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*
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* allocate growth at the start of newly extended region;
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* bmap file only grows sequentially, i.e., both data pages
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* and possibly xtree index pages may grow in append mode,
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* s.t. logredo() can reconstruct pre-extension state
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* by washing away bmap file of pages outside s_size boundary;
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*/
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/*
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* journal map file growth as if a regular file growth:
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* (note: bmap is created with di_mode = IFJOURNAL|IFREG);
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*
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* journaling of bmap file growth is not required since
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* logredo() do/can not use log records of bmap file growth
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* but it provides careful write semantics, pmap update, etc.;
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*/
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/* synchronous write of data pages: bmap data pages are
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* cached in meta-data cache, and not written out
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* by txCommit();
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*/
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filemap_fdatawait(ipbmap->i_mapping);
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filemap_write_and_wait(ipbmap->i_mapping);
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diWriteSpecial(ipbmap, 0);
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newPage = nPages; /* first new page number */
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xoff = newPage << sbi->l2nbperpage;
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xlen = (newNpages - nPages) << sbi->l2nbperpage;
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xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
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xaddr = XAddress;
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tid = txBegin(sb, COMMIT_FORCE);
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if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
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txEnd(tid);
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goto error_out;
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}
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/* update bmap file size */
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ipbmap->i_size += xlen << sbi->l2bsize;
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inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
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iplist[0] = ipbmap;
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rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
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txEnd(tid);
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if (rc)
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goto error_out;
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/*
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* map file has been grown now to cover extension to further out;
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* di_size = new map file size;
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*
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* if huge extension, the previous extension based on previous
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* map file size may not have been sufficient to cover whole extension
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* (it could have been used up for new map pages),
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* but the newly grown map file now covers lot bigger new free space
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* available for further extension of map;
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*/
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/* any more blocks to extend ? */
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if (XSize)
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goto extendBmap;
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finalizeBmap:
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/* finalize bmap */
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dbFinalizeBmap(ipbmap);
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/*
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* update inode allocation map
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* ---------------------------
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*
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* move iag lists from old to new iag;
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* agstart field is not updated for logredo() to reconstruct
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* iag lists if system crash occurs.
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* (computation of ag number from agstart based on agsize
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* will correctly identify the new ag);
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*/
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/* if new AG size the same as old AG size, done! */
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if (agsizechanged) {
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if ((rc = diExtendFS(ipimap, ipbmap)))
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goto error_out;
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/* finalize imap */
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if ((rc = diSync(ipimap)))
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goto error_out;
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}
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/*
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* finalize
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* --------
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*
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* extension is committed when on-disk super block is
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* updated with new descriptors: logredo will recover
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* crash before it to pre-extension state;
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*/
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/* sync log to skip log replay of bmap file growth transaction; */
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/* lmLogSync(log, 1); */
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/*
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* synchronous write bmap global control page;
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* for crash before completion of write
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* logredo() will recover to pre-extendfs state;
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* for crash after completion of write,
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* logredo() will recover post-extendfs state;
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*/
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if ((rc = dbSync(ipbmap)))
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goto error_out;
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/*
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* copy primary bmap inode to secondary bmap inode
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*/
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ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
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if (ipbmap2 == NULL) {
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printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
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goto error_out;
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}
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memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
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ipbmap2->i_size = ipbmap->i_size;
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ipbmap2->i_blocks = ipbmap->i_blocks;
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diWriteSpecial(ipbmap2, 1);
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diFreeSpecial(ipbmap2);
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/*
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* update superblock
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*/
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if ((rc = readSuper(sb, &bh)))
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goto error_out;
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j_sb = (struct jfs_superblock *)bh->b_data;
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/* mark extendfs() completion */
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j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
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j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
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le16_to_cpu(j_sb->s_l2bfactor));
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j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
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/* update inline log space descriptor */
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if (sbi->mntflag & JFS_INLINELOG) {
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PXDaddress(&(j_sb->s_logpxd), newLogAddress);
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PXDlength(&(j_sb->s_logpxd), newLogSize);
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}
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/* record log's mount serial number */
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j_sb->s_logserial = cpu_to_le32(log->serial);
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|
|
/* update fsck work space descriptor */
|
|
PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
|
|
PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
|
|
j_sb->s_fscklog = 1;
|
|
/* sb->s_fsckloglen remains the same */
|
|
|
|
/* Update secondary superblock */
|
|
bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
|
|
if (bh2) {
|
|
j_sb2 = (struct jfs_superblock *)bh2->b_data;
|
|
memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
|
|
|
|
mark_buffer_dirty(bh);
|
|
sync_dirty_buffer(bh2);
|
|
brelse(bh2);
|
|
}
|
|
|
|
/* write primary superblock */
|
|
mark_buffer_dirty(bh);
|
|
sync_dirty_buffer(bh);
|
|
brelse(bh);
|
|
|
|
goto resume;
|
|
|
|
error_out:
|
|
jfs_error(sb, "jfs_extendfs");
|
|
|
|
resume:
|
|
/*
|
|
* resume file system transactions
|
|
*/
|
|
txResume(sb);
|
|
|
|
out:
|
|
return rc;
|
|
}
|