276 lines
8.7 KiB
C
276 lines
8.7 KiB
C
/* $NetBSD: lfs_subr.c,v 1.15 2000/06/06 22:56:54 perseant Exp $ */
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/*-
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* Copyright (c) 1999 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) 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. 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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* @(#)lfs_subr.c 8.4 (Berkeley) 5/8/95
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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/namei.h>
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#include <sys/vnode.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <sys/proc.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/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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/*
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* Return buffer with the contents of block "offset" from the beginning of
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* directory "ip". If "res" is non-zero, fill it in with a pointer to the
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* remaining space in the directory.
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*/
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int
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lfs_blkatoff(v)
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void *v;
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{
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struct vop_blkatoff_args /* {
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struct vnode *a_vp;
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off_t a_offset;
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char **a_res;
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struct buf **a_bpp;
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} */ *ap = v;
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struct lfs *fs;
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struct inode *ip;
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struct buf *bp;
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ufs_daddr_t lbn;
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int bsize, error;
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ip = VTOI(ap->a_vp);
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fs = ip->i_lfs;
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lbn = lblkno(fs, ap->a_offset);
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bsize = blksize(fs, ip, lbn);
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*ap->a_bpp = NULL;
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if ((error = bread(ap->a_vp, lbn, bsize, NOCRED, &bp)) != 0) {
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brelse(bp);
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return (error);
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}
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if (ap->a_res)
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*ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
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*ap->a_bpp = bp;
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return (0);
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}
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/*
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* lfs_seglock --
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* Single thread the segment writer.
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*/
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void
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lfs_seglock(fs, flags)
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struct lfs *fs;
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unsigned long flags;
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{
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struct segment *sp;
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int s;
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if (fs->lfs_seglock) {
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if (fs->lfs_lockpid == curproc->p_pid) {
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++fs->lfs_seglock;
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fs->lfs_sp->seg_flags |= flags;
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return;
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} else while (fs->lfs_seglock)
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(void)tsleep(&fs->lfs_seglock, PRIBIO + 1,
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"lfs seglock", 0);
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}
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fs->lfs_seglock = 1;
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fs->lfs_lockpid = curproc->p_pid;
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sp = fs->lfs_sp = malloc(sizeof(struct segment), M_SEGMENT, M_WAITOK);
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sp->bpp = malloc(((LFS_SUMMARY_SIZE - sizeof(SEGSUM)) /
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sizeof(ufs_daddr_t) + 1) * sizeof(struct buf *),
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M_SEGMENT, M_WAITOK);
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sp->seg_flags = flags;
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sp->vp = NULL;
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(void) lfs_initseg(fs);
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/*
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* Keep a cumulative count of the outstanding I/O operations. If the
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* disk drive catches up with us it could go to zero before we finish,
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* so we artificially increment it by one until we've scheduled all of
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* the writes we intend to do.
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*/
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s = splbio();
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++fs->lfs_iocount;
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splx(s);
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}
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/*
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* lfs_segunlock --
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* Single thread the segment writer.
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*/
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void
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lfs_segunlock(fs)
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struct lfs *fs;
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{
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struct segment *sp;
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unsigned long sync, ckp;
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int s;
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struct vnode *vp;
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struct mount *mp;
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extern int lfs_dirvcount;
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sp = fs->lfs_sp;
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if (fs->lfs_seglock == 1 && !(sp->seg_flags & SEGM_PROT)) {
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mp = fs->lfs_ivnode->v_mount;
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/*
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* Go through and unmark all DIROP vnodes, possibly
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* calling VOP_INACTIVE (through vrele). This is
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* delayed until now in order not to accidentally
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* write a DIROP node through lfs_flush.
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*/
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#ifndef LFS_NO_BACKVP_HACK
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/* BEGIN HACK */
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#define VN_OFFSET (((caddr_t)&vp->v_mntvnodes.le_next) - (caddr_t)vp)
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#define BACK_VP(VP) ((struct vnode *)(((caddr_t)VP->v_mntvnodes.le_prev) - VN_OFFSET))
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#define BEG_OF_VLIST ((struct vnode *)(((caddr_t)&mp->mnt_vnodelist.lh_first) - VN_OFFSET))
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/* Find last vnode. */
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loop: for (vp = mp->mnt_vnodelist.lh_first;
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vp && vp->v_mntvnodes.le_next != NULL;
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vp = vp->v_mntvnodes.le_next);
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for (; vp && vp != BEG_OF_VLIST; vp = BACK_VP(vp)) {
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#else
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loop:
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for (vp = mp->mnt_vnodelist.lh_first;
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vp != NULL;
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vp = vp->v_mntvnodes.le_next) {
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#endif
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if (vp->v_mount != mp)
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goto loop;
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if (vp->v_type == VNON)
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continue;
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if ((vp->v_flag & VDIROP) &&
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!(VTOI(vp)->i_flag & IN_ADIROP)) {
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--lfs_dirvcount;
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vp->v_flag &= ~VDIROP;
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wakeup(&lfs_dirvcount);
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fs->lfs_unlockvp = vp;
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vrele(vp);
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fs->lfs_unlockvp = NULL;
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}
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}
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}
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if (fs->lfs_seglock == 1) {
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sync = sp->seg_flags & SEGM_SYNC;
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ckp = sp->seg_flags & SEGM_CKP;
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if (sp->bpp != sp->cbpp) {
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/* Free allocated segment summary */
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fs->lfs_offset -= LFS_SUMMARY_SIZE / DEV_BSIZE;
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lfs_freebuf(*sp->bpp);
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} else
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printf ("unlock to 0 with no summary");
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free(sp->bpp, M_SEGMENT);
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free(sp, M_SEGMENT);
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/*
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* If the I/O count is non-zero, sleep until it reaches zero.
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* At the moment, the user's process hangs around so we can
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* sleep.
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*/
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s = splbio();
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--fs->lfs_iocount;
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/*
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* We let checkpoints happen asynchronously. That means
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* that during recovery, we have to roll forward between
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* the two segments described by the first and second
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* superblocks to make sure that the checkpoint described
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* by a superblock completed.
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*/
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while (sync && fs->lfs_iocount)
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(void)tsleep(&fs->lfs_iocount, PRIBIO + 1,
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"lfs vflush", 0);
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splx(s);
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if (ckp) {
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fs->lfs_nactive = 0;
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/* If we *know* everything's on disk, write both sbs */
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if(sync)
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lfs_writesuper(fs,fs->lfs_sboffs[fs->lfs_activesb]);
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fs->lfs_activesb = 1 - fs->lfs_activesb;
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lfs_writesuper(fs,fs->lfs_sboffs[fs->lfs_activesb]);
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}
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--fs->lfs_seglock;
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fs->lfs_lockpid = 0;
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wakeup(&fs->lfs_seglock);
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} else if (fs->lfs_seglock == 0) {
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panic ("Seglock not held");
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} else {
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--fs->lfs_seglock;
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}
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}
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