248 lines
6.5 KiB
C
248 lines
6.5 KiB
C
/* $NetBSD: ext2fs_balloc.c,v 1.1 1997/06/11 09:33:44 bouyer Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer.
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93
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* Modified for ext2fs by Manuel Bouyer.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_extern.h>
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/*
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* Balloc defines the structure of file system storage
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* by allocating the physical blocks on a device given
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* the inode and the logical block number in a file.
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*/
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int
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ext2fs_balloc(ip, bn, size, cred, bpp, flags)
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register struct inode *ip;
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register daddr_t bn;
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int size;
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struct ucred *cred;
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struct buf **bpp;
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int flags;
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{
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register struct m_ext2fs *fs;
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register daddr_t nb;
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struct buf *bp, *nbp;
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struct vnode *vp = ITOV(ip);
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struct indir indirs[NIADDR + 2];
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daddr_t newb, lbn, *bap, pref;
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int num, i, error;
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*bpp = NULL;
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if (bn < 0)
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return (EFBIG);
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fs = ip->i_e2fs;
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lbn = bn;
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/*
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* The first NDADDR blocks are direct blocks
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*/
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if (bn < NDADDR) {
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nb = ip->i_e2fs_blocks[bn];
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if (nb != 0) {
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error = bread(vp, bn, fs->e2fs_bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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*bpp = bp;
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return (0);
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} else {
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error = ext2fs_alloc(ip, bn,
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ext2fs_blkpref(ip, bn, (int)bn, &ip->i_e2fs_blocks[0]),
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cred, &newb);
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if (error)
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return (error);
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ip->i_e2fs_last_lblk = lbn;
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ip->i_e2fs_last_blk = newb;
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bp = getblk(vp, bn, fs->e2fs_bsize, 0, 0);
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bp->b_blkno = fsbtodb(fs, newb);
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if (flags & B_CLRBUF)
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clrbuf(bp);
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}
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ip->i_e2fs_blocks[bn] = dbtofsb(fs, bp->b_blkno);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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*bpp = bp;
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return (0);
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}
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/*
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* Determine the number of levels of indirection.
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*/
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pref = 0;
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if ((error = ufs_getlbns(vp, bn, indirs, &num)) != 0)
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return(error);
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#ifdef DIAGNOSTIC
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if (num < 1)
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panic ("ext2fs_balloc: ufs_getlbns returned indirect block\n");
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#endif
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/*
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* Fetch the first indirect block allocating if necessary.
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*/
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--num;
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nb = ip->i_e2fs_blocks[NDADDR + indirs[0].in_off];
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if (nb == 0) {
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pref = ext2fs_blkpref(ip, lbn, 0, (daddr_t *)0);
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error = ext2fs_alloc(ip, lbn, pref,
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cred, &newb);
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if (error)
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return (error);
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nb = newb;
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ip->i_e2fs_last_blk = newb;
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bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0);
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bp->b_blkno = fsbtodb(fs, newb);
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clrbuf(bp);
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/*
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* Write synchronously so that indirect blocks
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* never point at garbage.
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*/
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if ((error = bwrite(bp)) != 0) {
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ext2fs_blkfree(ip, nb);
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return (error);
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}
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ip->i_e2fs_blocks[NDADDR + indirs[0].in_off] = newb;
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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}
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/*
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* Fetch through the indirect blocks, allocating as necessary.
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*/
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for (i = 1;;) {
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error = bread(vp,
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indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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bap = (daddr_t *)bp->b_data;
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nb = bap[indirs[i].in_off];
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if (i == num)
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break;
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i += 1;
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if (nb != 0) {
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brelse(bp);
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continue;
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}
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pref = ext2fs_blkpref(ip, lbn, 0, (daddr_t *)0);
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error = ext2fs_alloc(ip, lbn, pref, cred,
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&newb);
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if (error) {
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brelse(bp);
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return (error);
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}
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nb = newb;
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ip->i_e2fs_last_blk = newb;
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nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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clrbuf(nbp);
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/*
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* Write synchronously so that indirect blocks
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* never point at garbage.
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*/
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if ((error = bwrite(nbp)) != 0) {
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ext2fs_blkfree(ip, nb);
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brelse(bp);
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return (error);
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}
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bap[indirs[i - 1].in_off] = nb;
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/*
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* If required, write synchronously, otherwise use
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* delayed write.
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*/
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if (flags & B_SYNC) {
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bwrite(bp);
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} else {
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bdwrite(bp);
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}
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}
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/*
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* Get the data block, allocating if necessary.
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*/
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if (nb == 0) {
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pref = ext2fs_blkpref(ip, lbn, indirs[i].in_off, &bap[0]);
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error = ext2fs_alloc(ip, lbn, pref, cred,
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&newb);
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if (error) {
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brelse(bp);
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return (error);
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}
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nb = newb;
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ip->i_e2fs_last_lblk = lbn;
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ip->i_e2fs_last_blk = newb;
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nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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if (flags & B_CLRBUF)
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clrbuf(nbp);
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bap[indirs[i].in_off] = nb;
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/*
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* If required, write synchronously, otherwise use
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* delayed write.
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*/
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if (flags & B_SYNC) {
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bwrite(bp);
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} else {
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bdwrite(bp);
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}
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*bpp = nbp;
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return (0);
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}
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brelse(bp);
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if (flags & B_CLRBUF) {
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error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED, &nbp);
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if (error) {
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brelse(nbp);
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return (error);
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}
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} else {
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nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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}
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*bpp = nbp;
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return (0);
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}
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