a818a47169
a bug in fragment extension that could run the count negative. Also, don't overcount for inodes, and don't count segment summaries. Thus, for empty segments the live bytes count should now be exactly zero.
323 lines
10 KiB
C
323 lines
10 KiB
C
/* $NetBSD: lfs_balloc.c,v 1.13 1999/06/15 22:25:41 perseant Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Konrad E. Schroder <perseant@hhhh.org>.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
/*
|
|
* Copyright (c) 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)lfs_balloc.c 8.4 (Berkeley) 5/8/95
|
|
*/
|
|
|
|
#if defined(_KERNEL) && !defined(_LKM)
|
|
#include "opt_quota.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/trace.h>
|
|
|
|
#include <miscfs/specfs/specdev.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
|
|
#include <ufs/lfs/lfs.h>
|
|
#include <ufs/lfs/lfs_extern.h>
|
|
|
|
#include <vm/vm.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
int lfs_fragextend __P((struct vnode *, int, int, ufs_daddr_t, struct buf **));
|
|
|
|
int
|
|
lfs_balloc(vp, offset, iosize, lbn, bpp)
|
|
struct vnode *vp;
|
|
int offset;
|
|
u_long iosize;
|
|
ufs_daddr_t lbn;
|
|
struct buf **bpp;
|
|
{
|
|
struct buf *ibp, *bp;
|
|
struct inode *ip;
|
|
struct lfs *fs;
|
|
struct indir indirs[NIADDR+2];
|
|
ufs_daddr_t daddr, lastblock;
|
|
int bb; /* number of disk blocks in a block disk blocks */
|
|
int error, frags, i, nsize, osize, num;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_lfs;
|
|
|
|
#ifdef DEBUG
|
|
if(!VOP_ISLOCKED(vp)) {
|
|
printf("lfs_balloc: warning: ino %d not locked\n",ip->i_number);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Three cases: it's a block beyond the end of file, it's a block in
|
|
* the file that may or may not have been assigned a disk address or
|
|
* we're writing an entire block. Note, if the daddr is unassigned,
|
|
* the block might still have existed in the cache (if it was read
|
|
* or written earlier). If it did, make sure we don't count it as a
|
|
* new block or zero out its contents. If it did not, make sure
|
|
* we allocate any necessary indirect blocks.
|
|
* If we are writing a block beyond the end of the file, we need to
|
|
* check if the old last block was a fragment. If it was, we need
|
|
* to rewrite it.
|
|
*/
|
|
|
|
*bpp = NULL;
|
|
error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL );
|
|
if (error)
|
|
return (error);
|
|
|
|
/* Check for block beyond end of file and fragment extension needed. */
|
|
lastblock = lblkno(fs, ip->i_ffs_size);
|
|
if (lastblock < NDADDR && lastblock < lbn) {
|
|
osize = blksize(fs, ip, lastblock);
|
|
if (osize < fs->lfs_bsize && osize > 0) {
|
|
if ((error = lfs_fragextend(vp, osize, fs->lfs_bsize,
|
|
lastblock, &bp)))
|
|
return(error);
|
|
ip->i_ffs_size = (lastblock + 1) * fs->lfs_bsize;
|
|
uvm_vnp_setsize(vp, ip->i_ffs_size);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
VOP_BWRITE(bp);
|
|
}
|
|
}
|
|
|
|
bb = VFSTOUFS(vp->v_mount)->um_seqinc;
|
|
if (daddr == UNASSIGNED)
|
|
/* May need to allocate indirect blocks */
|
|
for (i = 1; i < num; ++i)
|
|
if (!indirs[i].in_exists) {
|
|
ibp = getblk(vp, indirs[i].in_lbn, fs->lfs_bsize,
|
|
0, 0);
|
|
if ((ibp->b_flags & (B_DONE | B_DELWRI)))
|
|
panic ("Indirect block should not exist");
|
|
|
|
if (!ISSPACE(fs, bb, curproc->p_ucred)){
|
|
ibp->b_flags |= B_INVAL;
|
|
brelse(ibp);
|
|
return(ENOSPC);
|
|
} else {
|
|
ip->i_ffs_blocks += bb;
|
|
ip->i_lfs->lfs_bfree -= bb;
|
|
clrbuf(ibp);
|
|
if ((error = VOP_BWRITE(ibp)))
|
|
return(error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the block we are writing is a direct block, it's the last
|
|
* block in the file, and offset + iosize is less than a full
|
|
* block, we can write one or more fragments. There are two cases:
|
|
* the block is brand new and we should allocate it the correct
|
|
* size or it already exists and contains some fragments and
|
|
* may need to extend it.
|
|
*/
|
|
if (lbn < NDADDR && lblkno(fs, ip->i_ffs_size) <= lbn) {
|
|
osize = blksize(fs, ip, lbn);
|
|
nsize = fragroundup(fs, offset + iosize);
|
|
frags = numfrags(fs, nsize);
|
|
bb = fragstodb(fs, frags);
|
|
if (lblktosize(fs, lbn) >= ip->i_ffs_size)
|
|
/* Brand new block or fragment */
|
|
*bpp = bp = getblk(vp, lbn, nsize, 0, 0);
|
|
else {
|
|
if (nsize <= osize) {
|
|
/* No need to extend */
|
|
/* XXX KS - Are we wasting space? */
|
|
if ((error = bread(vp, lbn, osize, NOCRED, &bp)))
|
|
return error;
|
|
} else {
|
|
/* Extend existing block */
|
|
if ((error =
|
|
lfs_fragextend(vp, osize, nsize, lbn, &bp)))
|
|
return(error);
|
|
}
|
|
*bpp = bp;
|
|
}
|
|
} else {
|
|
/*
|
|
* Get the existing block from the cache either because the
|
|
* block 1) is not a direct block or 2) is not the last
|
|
* block in the file.
|
|
*/
|
|
frags = dbtofrags(fs, bb);
|
|
*bpp = bp = getblk(vp, lbn, blksize(fs, ip, lbn), 0, 0);
|
|
}
|
|
|
|
/*
|
|
* The block we are writing may be a brand new block
|
|
* in which case we need to do accounting (i.e. check
|
|
* for free space and update the inode number of blocks.
|
|
*/
|
|
if (!(bp->b_flags & (B_DONE | B_DELWRI))) {
|
|
if (daddr == UNASSIGNED)
|
|
if (!ISSPACE(fs, bb, curproc->p_ucred)) {
|
|
bp->b_flags |= B_INVAL;
|
|
brelse(bp);
|
|
return(ENOSPC);
|
|
} else {
|
|
ip->i_ffs_blocks += bb;
|
|
ip->i_lfs->lfs_bfree -= bb;
|
|
if (iosize != fs->lfs_bsize)
|
|
clrbuf(bp);
|
|
}
|
|
else if (iosize == fs->lfs_bsize)
|
|
/* Optimization: I/O is unnecessary. */
|
|
bp->b_blkno = daddr;
|
|
else {
|
|
/*
|
|
* We need to read the block to preserve the
|
|
* existing bytes.
|
|
*/
|
|
bp->b_blkno = daddr;
|
|
bp->b_flags |= B_READ;
|
|
VOP_STRATEGY(bp);
|
|
return(biowait(bp));
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
lfs_fragextend(vp, osize, nsize, lbn, bpp)
|
|
struct vnode *vp;
|
|
int osize;
|
|
int nsize;
|
|
ufs_daddr_t lbn;
|
|
struct buf **bpp;
|
|
{
|
|
struct inode *ip;
|
|
struct lfs *fs;
|
|
long bb;
|
|
int error;
|
|
extern long locked_queue_bytes;
|
|
struct buf *ibp;
|
|
SEGUSE *sup;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_lfs;
|
|
|
|
bb = (long)fragstodb(fs, numfrags(fs, nsize - osize));
|
|
top:
|
|
if (!ISSPACE(fs, bb, curproc->p_ucred)) {
|
|
return(ENOSPC);
|
|
}
|
|
if ((error = bread(vp, lbn, osize, NOCRED, bpp))) {
|
|
brelse(*bpp);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Fix the allocation for this fragment so that it looks like the
|
|
* source segment contained a block of the new size. This overcounts;
|
|
* but the overcount only lasts until the block in question
|
|
* is written, so the on-disk live bytes count is always correct.
|
|
*/
|
|
LFS_SEGENTRY(sup, fs, datosn(fs,(*bpp)->b_blkno), ibp);
|
|
sup->su_nbytes += (nsize-osize);
|
|
VOP_BWRITE(ibp);
|
|
|
|
#ifdef QUOTA
|
|
if ((error = chkdq(ip, bb, curproc->p_ucred, 0))) {
|
|
brelse(*bpp);
|
|
return (error);
|
|
}
|
|
#endif
|
|
/*
|
|
* XXX - KS - Don't change size while we're gathered, as we could
|
|
* then overlap another buffer in lfs_writeseg.
|
|
*/
|
|
if((*bpp)->b_flags & B_GATHERED) {
|
|
(*bpp)->b_flags |= B_NEEDCOMMIT; /* XXX KS - what flag to use? */
|
|
brelse(*bpp);
|
|
tsleep(*bpp, (PRIBIO+1), "lfs_fragextend", 0);
|
|
goto top;
|
|
}
|
|
ip->i_ffs_blocks += bb;
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
fs->lfs_bfree -= fragstodb(fs, numfrags(fs, (nsize - osize)));
|
|
if((*bpp)->b_flags & B_LOCKED)
|
|
locked_queue_bytes += (nsize - osize);
|
|
allocbuf(*bpp, nsize);
|
|
bzero((char *)((*bpp)->b_data) + osize, (u_int)(nsize - osize));
|
|
|
|
return(0);
|
|
}
|