447 lines
13 KiB
C
447 lines
13 KiB
C
/* $NetBSD: lfs_balloc.c,v 1.46 2003/10/29 01:25:04 mycroft Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Konrad E. Schroder <perseant@hhhh.org>.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1989, 1991, 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. 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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* @(#)lfs_balloc.c 8.4 (Berkeley) 5/8/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lfs_balloc.c,v 1.46 2003/10/29 01:25:04 mycroft Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_quota.h"
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#endif
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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/vnode.h>
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#include <sys/mount.h>
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#include <sys/resourcevar.h>
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#include <sys/trace.h>
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#include <miscfs/specfs/specdev.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/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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#include <uvm/uvm.h>
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int lfs_fragextend(struct vnode *, int, int, daddr_t, struct buf **, struct ucred *);
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/*
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* Allocate a block, and to inode and filesystem block accounting for it
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* and for any indirect blocks the may need to be created in order for
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* this block to be created.
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*
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* Blocks which have never been accounted for (i.e., which "do not exist")
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* have disk address 0, which is translated by ufs_bmap to the special value
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* UNASSIGNED == -1, as in the historical UFS.
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*
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* Blocks which have been accounted for but which have not yet been written
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* to disk are given the new special disk address UNWRITTEN == -2, so that
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* they can be differentiated from completely new blocks.
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*/
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/* VOP_BWRITE NIADDR+2 times */
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int
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lfs_balloc(void *v)
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{
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struct vop_balloc_args /* {
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struct vnode *a_vp;
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off_t a_startoffset;
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int a_size;
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struct ucred *a_cred;
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int a_flags;
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struct buf *a_bpp;
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} */ *ap = v;
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struct vnode *vp;
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int offset;
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u_long iosize;
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daddr_t daddr, idaddr;
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struct buf *ibp, *bp, **bpp;
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struct inode *ip;
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struct lfs *fs;
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struct indir indirs[NIADDR+2], *idp;
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daddr_t lbn, lastblock;
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int bb, bcount;
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int error, frags, i, nsize, osize, num;
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vp = ap->a_vp;
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ip = VTOI(vp);
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fs = ip->i_lfs;
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offset = blkoff(fs, ap->a_startoffset);
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iosize = ap->a_size;
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KASSERT(iosize <= fs->lfs_bsize);
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lbn = lblkno(fs, ap->a_startoffset);
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/* (void)lfs_check(vp, lbn, 0); */
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bpp = ap->a_bpp;
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/*
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* Three cases: it's a block beyond the end of file, it's a block in
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* the file that may or may not have been assigned a disk address or
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* we're writing an entire block.
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*
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* Note, if the daddr is UNWRITTEN, the block already exists in
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* the cache (it was read or written earlier). If so, make sure
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* we don't count it as a new block or zero out its contents. If
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* it did not, make sure we allocate any necessary indirect
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* blocks.
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*
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* If we are writing a block beyond the end of the file, we need to
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* check if the old last block was a fragment. If it was, we need
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* to rewrite it.
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*/
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if (bpp)
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*bpp = NULL;
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/* Check for block beyond end of file and fragment extension needed. */
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lastblock = lblkno(fs, ip->i_size);
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if (lastblock < NDADDR && lastblock < lbn) {
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osize = blksize(fs, ip, lastblock);
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if (osize < fs->lfs_bsize && osize > 0) {
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if ((error = lfs_fragextend(vp, osize, fs->lfs_bsize,
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lastblock,
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(bpp ? &bp : NULL),
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ap->a_cred)))
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return (error);
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ip->i_ffs1_size = ip->i_size =
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(lastblock + 1) * fs->lfs_bsize;
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uvm_vnp_setsize(vp, ip->i_size);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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if (bpp)
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(void) VOP_BWRITE(bp);
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}
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}
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/*
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* If the block we are writing is a direct block, it's the last
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* block in the file, and offset + iosize is less than a full
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* block, we can write one or more fragments. There are two cases:
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* the block is brand new and we should allocate it the correct
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* size or it already exists and contains some fragments and
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* may need to extend it.
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*/
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if (lbn < NDADDR && lblkno(fs, ip->i_size) <= lbn) {
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osize = blksize(fs, ip, lbn);
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nsize = fragroundup(fs, offset + iosize);
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if (lblktosize(fs, lbn) >= ip->i_size) {
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/* Brand new block or fragment */
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frags = numfrags(fs, nsize);
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bb = fragstofsb(fs, frags);
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if (bpp) {
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*ap->a_bpp = bp = getblk(vp, lbn, nsize, 0, 0);
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bp->b_blkno = UNWRITTEN;
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if (ap->a_flags & B_CLRBUF)
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clrbuf(bp);
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}
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ip->i_lfs_effnblks += bb;
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ip->i_lfs->lfs_bfree -= bb;
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ip->i_ffs1_db[lbn] = UNWRITTEN;
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} else {
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if (nsize <= osize) {
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/* No need to extend */
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if (bpp && (error = bread(vp, lbn, osize, NOCRED, &bp)))
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return error;
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} else {
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/* Extend existing block */
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if ((error =
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lfs_fragextend(vp, osize, nsize, lbn,
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(bpp ? &bp : NULL),
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ap->a_cred)))
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return error;
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}
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if (bpp)
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*bpp = bp;
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}
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return 0;
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}
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error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL, NULL);
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if (error)
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return (error);
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/*
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* Do byte accounting all at once, so we can gracefully fail *before*
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* we start assigning blocks.
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*/
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bb = VFSTOUFS(vp->v_mount)->um_seqinc;
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bcount = 0;
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if (daddr == UNASSIGNED) {
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bcount = bb;
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}
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for (i = 1; i < num; ++i) {
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if (!indirs[i].in_exists) {
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bcount += bb;
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}
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}
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if (ISSPACE(fs, bcount, ap->a_cred)) {
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ip->i_lfs->lfs_bfree -= bcount;
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ip->i_lfs_effnblks += bcount;
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} else {
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return ENOSPC;
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}
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if (daddr == UNASSIGNED) {
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if (num > 0 && ip->i_ffs1_ib[indirs[0].in_off] == 0) {
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ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN;
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}
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/*
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* Create new indirect blocks if necessary
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*/
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if (num > 1) {
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idaddr = ip->i_ffs1_ib[indirs[0].in_off];
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for (i = 1; i < num; ++i) {
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ibp = getblk(vp, indirs[i].in_lbn,
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fs->lfs_bsize, 0,0);
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if (!indirs[i].in_exists) {
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clrbuf(ibp);
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ibp->b_blkno = UNWRITTEN;
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} else if (!(ibp->b_flags & (B_DELWRI | B_DONE))) {
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ibp->b_blkno = fsbtodb(fs, idaddr);
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ibp->b_flags |= B_READ;
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VOP_STRATEGY(ibp);
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biowait(ibp);
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}
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/*
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* This block exists, but the next one may not.
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* If that is the case mark it UNWRITTEN to keep
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* the accounting straight.
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*/
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/* XXX ondisk32 */
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if (((int32_t *)ibp->b_data)[indirs[i].in_off] == 0)
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((int32_t *)ibp->b_data)[indirs[i].in_off] =
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UNWRITTEN;
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/* XXX ondisk32 */
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idaddr = ((int32_t *)ibp->b_data)[indirs[i].in_off];
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if ((error = VOP_BWRITE(ibp)))
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return error;
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}
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}
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}
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/*
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* Get the existing block from the cache, if requested.
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*/
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frags = fsbtofrags(fs, bb);
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if (bpp)
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*bpp = bp = getblk(vp, lbn, blksize(fs, ip, lbn), 0, 0);
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/*
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* The block we are writing may be a brand new block
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* in which case we need to do accounting.
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*
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* We can tell a truly new block because ufs_bmaparray will say
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* it is UNASSIGNED. Once we allocate it we will assign it the
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* disk address UNWRITTEN.
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*/
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if (daddr == UNASSIGNED) {
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if (bpp) {
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if (ap->a_flags & B_CLRBUF)
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clrbuf(bp);
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/* Note the new address */
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bp->b_blkno = UNWRITTEN;
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}
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switch (num) {
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case 0:
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ip->i_ffs1_db[lbn] = UNWRITTEN;
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break;
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case 1:
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ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN;
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break;
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default:
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idp = &indirs[num - 1];
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if (bread(vp, idp->in_lbn, fs->lfs_bsize, NOCRED,
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&ibp))
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panic("lfs_balloc: bread bno %lld",
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(long long)idp->in_lbn);
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/* XXX ondisk32 */
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((int32_t *)ibp->b_data)[idp->in_off] = UNWRITTEN;
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VOP_BWRITE(ibp);
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}
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} else if (bpp && !(bp->b_flags & (B_DONE|B_DELWRI))) {
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/*
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* Not a brand new block, also not in the cache;
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* read it in from disk.
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*/
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if (iosize == fs->lfs_bsize)
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/* Optimization: I/O is unnecessary. */
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bp->b_blkno = daddr;
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else {
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/*
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* We need to read the block to preserve the
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* existing bytes.
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*/
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bp->b_blkno = daddr;
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bp->b_flags |= B_READ;
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VOP_STRATEGY(bp);
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return (biowait(bp));
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}
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}
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return (0);
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}
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/* VOP_BWRITE 1 time */
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int
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lfs_fragextend(struct vnode *vp, int osize, int nsize, daddr_t lbn, struct buf **bpp, struct ucred *cred)
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{
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struct inode *ip;
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struct lfs *fs;
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long bb;
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int error;
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extern long locked_queue_bytes;
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size_t obufsize;
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ip = VTOI(vp);
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fs = ip->i_lfs;
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bb = (long)fragstofsb(fs, numfrags(fs, nsize - osize));
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error = 0;
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/*
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* Get the seglock so we don't enlarge blocks while a segment
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* is being written. If we're called with bpp==NULL, though,
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* we are only pretending to change a buffer, so we don't have to
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* lock.
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*/
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top:
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if (bpp) {
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lockmgr(&fs->lfs_fraglock, LK_SHARED, 0);
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LFS_DEBUG_COUNTLOCKED("frag");
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}
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if (!ISSPACE(fs, bb, cred)) {
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error = ENOSPC;
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goto out;
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}
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/*
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* If we are not asked to actually return the block, all we need
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* to do is allocate space for it. UBC will handle dirtying the
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* appropriate things and making sure it all goes to disk.
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* Don't bother to read in that case.
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*/
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if (bpp && (error = bread(vp, lbn, osize, NOCRED, bpp))) {
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brelse(*bpp);
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goto out;
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}
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#ifdef QUOTA
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if ((error = chkdq(ip, bb, cred, 0))) {
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if (bpp)
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brelse(*bpp);
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goto out;
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}
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#endif
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/*
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* Adjust accounting for lfs_avail. If there's not enough room,
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* we will have to wait for the cleaner, which we can't do while
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* holding a block busy or while holding the seglock. In that case,
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* release both and start over after waiting.
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*/
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if (bpp && ((*bpp)->b_flags & B_DELWRI)) {
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if (!lfs_fits(fs, bb)) {
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if (bpp)
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brelse(*bpp);
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#ifdef QUOTA
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chkdq(ip, -bb, cred, 0);
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#endif
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lockmgr(&fs->lfs_fraglock, LK_RELEASE, 0);
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lfs_availwait(fs, bb);
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goto top;
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}
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fs->lfs_avail -= bb;
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}
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fs->lfs_bfree -= bb;
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ip->i_lfs_effnblks += bb;
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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if (bpp) {
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obufsize = (*bpp)->b_bufsize;
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allocbuf(*bpp, nsize);
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/* Adjust locked-list accounting */
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if (((*bpp)->b_flags & (B_LOCKED | B_CALL)) == B_LOCKED)
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locked_queue_bytes += (*bpp)->b_bufsize - obufsize;
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bzero((char *)((*bpp)->b_data) + osize, (u_int)(nsize - osize));
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}
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out:
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if (bpp) {
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lockmgr(&fs->lfs_fraglock, LK_RELEASE, 0);
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}
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return (error);
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}
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