eefd94b8e2
stuff under '#ifdef DEBUG', and use sysctl knobs to turn on/off particular parts of the debugging reporting (if DEBUG is enabled). Re-enable the LFS statistics in sysctl, while I'm there. A bit of a rototill.
563 lines
16 KiB
C
563 lines
16 KiB
C
/* $NetBSD: lfs_alloc.c,v 1.76 2005/03/08 00:18:19 perseant 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) 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_alloc.c 8.4 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lfs_alloc.c,v 1.76 2005/03/08 00:18:19 perseant 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/kernel.h>
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#include <sys/buf.h>
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#include <sys/lock.h>
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#include <sys/vnode.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <sys/pool.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/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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extern struct lock ufs_hashlock;
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static int extend_ifile(struct lfs *, struct ucred *);
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static int lfs_ialloc(struct lfs *, struct vnode *, ino_t, int,
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struct vnode **);
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/*
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* Allocate a particular inode with a particular version number, freeing
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* any previous versions of this inode that may have gone before.
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* Used by the roll-forward code.
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*
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* XXX this function does not have appropriate locking to be used on a live fs;
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* XXX but something similar could probably be used for an "undelete" call.
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*
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* Called with the Ifile inode locked.
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*/
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int
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lfs_rf_valloc(struct lfs *fs, ino_t ino, int version, struct proc *p,
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struct vnode **vpp)
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{
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IFILE *ifp;
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struct buf *bp, *cbp;
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struct vnode *vp;
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struct inode *ip;
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ino_t tino, oldnext;
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int error;
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CLEANERINFO *cip;
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/*
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* First, just try a vget. If the version number is the one we want,
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* we don't have to do anything else. If the version number is wrong,
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* take appropriate action.
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*/
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error = VFS_VGET(fs->lfs_ivnode->v_mount, ino, &vp);
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if (error == 0) {
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DLOG((DLOG_RF, "lfs_rf_valloc[1]: ino %d vp %p\n", ino, vp));
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*vpp = vp;
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ip = VTOI(vp);
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if (ip->i_gen == version)
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return 0;
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else if (ip->i_gen < version) {
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VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, p);
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ip->i_gen = ip->i_ffs1_gen = version;
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LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE);
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return 0;
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} else {
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DLOG((DLOG_RF, "ino %d: sought version %d, got %d\n",
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ino, version, ip->i_ffs1_gen));
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vput(vp);
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*vpp = NULLVP;
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return EEXIST;
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}
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}
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/*
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* The inode is not in use. Find it on the free list.
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*/
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/* If the Ifile is too short to contain this inum, extend it */
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while (VTOI(fs->lfs_ivnode)->i_size <= (ino /
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fs->lfs_ifpb + fs->lfs_cleansz + fs->lfs_segtabsz)
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<< fs->lfs_bshift) {
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extend_ifile(fs, NOCRED);
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}
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LFS_IENTRY(ifp, fs, ino, bp);
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oldnext = ifp->if_nextfree;
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ifp->if_version = version;
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brelse(bp);
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LFS_GET_HEADFREE(fs, cip, cbp, &ino);
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if (ino) {
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LFS_PUT_HEADFREE(fs, cip, cbp, oldnext);
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} else {
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tino = ino;
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while (1) {
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LFS_IENTRY(ifp, fs, tino, bp);
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if (ifp->if_nextfree == ino ||
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ifp->if_nextfree == LFS_UNUSED_INUM)
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break;
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tino = ifp->if_nextfree;
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brelse(bp);
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}
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if (ifp->if_nextfree == LFS_UNUSED_INUM) {
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brelse(bp);
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return ENOENT;
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}
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ifp->if_nextfree = oldnext;
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LFS_BWRITE_LOG(bp);
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}
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error = lfs_ialloc(fs, fs->lfs_ivnode, ino, version, &vp);
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if (error == 0) {
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/*
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* Make it VREG so we can put blocks on it. We will change
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* this later if it turns out to be some other kind of file.
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*/
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ip = VTOI(vp);
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ip->i_mode = ip->i_ffs1_mode = IFREG;
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ip->i_nlink = ip->i_ffs1_nlink = 1;
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ip->i_ffs_effnlink = 1;
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ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp);
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ip = VTOI(vp);
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DLOG((DLOG_RF, "lfs_rf_valloc: ino %d vp %p\n", ino, vp));
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/* The dirop-nature of this vnode is past */
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lfs_unmark_vnode(vp);
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(void)lfs_vunref(vp);
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--lfs_dirvcount;
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vp->v_flag &= ~VDIROP;
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TAILQ_REMOVE(&fs->lfs_dchainhd, ip, i_lfs_dchain);
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}
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*vpp = vp;
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return error;
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}
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/*
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* Add a new block to the Ifile, to accommodate future file creations.
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* Called with the segment lock held.
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*/
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static int
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extend_ifile(struct lfs *fs, struct ucred *cred)
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{
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struct vnode *vp;
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struct inode *ip;
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IFILE *ifp;
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IFILE_V1 *ifp_v1;
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struct buf *bp, *cbp;
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int error;
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daddr_t i, blkno, max;
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ino_t oldlast;
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CLEANERINFO *cip;
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vp = fs->lfs_ivnode;
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ip = VTOI(vp);
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blkno = lblkno(fs, ip->i_size);
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if ((error = VOP_BALLOC(vp, ip->i_size, fs->lfs_bsize, cred, 0,
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&bp)) != 0) {
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return (error);
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}
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ip->i_size += fs->lfs_bsize;
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ip->i_ffs1_size = ip->i_size;
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uvm_vnp_setsize(vp, ip->i_size);
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i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
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fs->lfs_ifpb;
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LFS_GET_HEADFREE(fs, cip, cbp, &oldlast);
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LFS_PUT_HEADFREE(fs, cip, cbp, i);
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#ifdef DIAGNOSTIC
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if (fs->lfs_freehd == LFS_UNUSED_INUM)
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panic("inode 0 allocated [2]");
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#endif /* DIAGNOSTIC */
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max = i + fs->lfs_ifpb;
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if (fs->lfs_version == 1) {
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for (ifp_v1 = (IFILE_V1 *)bp->b_data; i < max; ++ifp_v1) {
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ifp_v1->if_version = 1;
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ifp_v1->if_daddr = LFS_UNUSED_DADDR;
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ifp_v1->if_nextfree = ++i;
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}
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ifp_v1--;
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ifp_v1->if_nextfree = oldlast;
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} else {
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for (ifp = (IFILE *)bp->b_data; i < max; ++ifp) {
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ifp->if_version = 1;
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ifp->if_daddr = LFS_UNUSED_DADDR;
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ifp->if_nextfree = ++i;
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}
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ifp--;
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ifp->if_nextfree = oldlast;
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}
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LFS_PUT_TAILFREE(fs, cip, cbp, max - 1);
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(void) LFS_BWRITE_LOG(bp); /* Ifile */
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return 0;
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}
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/* Allocate a new inode. */
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/* ARGSUSED */
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/* VOP_BWRITE 2i times */
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int
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lfs_valloc(void *v)
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{
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struct vop_valloc_args /* {
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struct vnode *a_pvp;
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int a_mode;
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struct ucred *a_cred;
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struct vnode **a_vpp;
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} */ *ap = v;
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struct lfs *fs;
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struct buf *bp, *cbp;
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struct ifile *ifp;
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ino_t new_ino;
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int error;
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int new_gen;
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CLEANERINFO *cip;
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fs = VTOI(ap->a_pvp)->i_lfs;
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if (fs->lfs_ronly)
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return EROFS;
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*ap->a_vpp = NULL;
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lfs_seglock(fs, SEGM_PROT);
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/* Get the head of the freelist. */
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LFS_GET_HEADFREE(fs, cip, cbp, &new_ino);
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#ifdef DIAGNOSTIC
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if (new_ino == LFS_UNUSED_INUM) {
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#ifdef DEBUG
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lfs_dump_super(fs);
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#endif /* DEBUG */
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panic("inode 0 allocated [1]");
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}
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#endif /* DIAGNOSTIC */
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DLOG((DLOG_ALLOC, "lfs_valloc: allocate inode %d\n", new_ino));
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/*
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* Remove the inode from the free list and write the new start
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* of the free list into the superblock.
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*/
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LFS_IENTRY(ifp, fs, new_ino, bp);
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if (ifp->if_daddr != LFS_UNUSED_DADDR)
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panic("lfs_valloc: inuse inode %d on the free list", new_ino);
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LFS_PUT_HEADFREE(fs, cip, cbp, ifp->if_nextfree);
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DLOG((DLOG_ALLOC, "lfs_valloc: headfree %d -> %d\n", new_ino,
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ifp->if_nextfree));
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new_gen = ifp->if_version; /* version was updated by vfree */
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brelse(bp);
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/* Extend IFILE so that the next lfs_valloc will succeed. */
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if (fs->lfs_freehd == LFS_UNUSED_INUM) {
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if ((error = extend_ifile(fs, ap->a_cred)) != 0) {
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LFS_PUT_HEADFREE(fs, cip, cbp, new_ino);
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lfs_segunlock(fs);
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return error;
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}
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}
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#ifdef DIAGNOSTIC
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if (fs->lfs_freehd == LFS_UNUSED_INUM)
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panic("inode 0 allocated [3]");
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#endif /* DIAGNOSTIC */
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lfs_segunlock(fs);
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return lfs_ialloc(fs, ap->a_pvp, new_ino, new_gen, ap->a_vpp);
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}
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/*
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* Finish allocating a new inode, given an inode and generation number.
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*/
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static int
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lfs_ialloc(struct lfs *fs, struct vnode *pvp, ino_t new_ino, int new_gen,
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struct vnode **vpp)
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{
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struct inode *ip;
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struct vnode *vp;
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IFILE *ifp;
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struct buf *bp, *cbp;
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int error;
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CLEANERINFO *cip;
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error = getnewvnode(VT_LFS, pvp->v_mount, lfs_vnodeop_p, &vp);
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DLOG((DLOG_ALLOC, "lfs_ialloc: ino %d vp %p error %d\n", new_ino,
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vp, error));
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if (error)
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goto errout;
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lockmgr(&ufs_hashlock, LK_EXCLUSIVE, 0);
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/* Create an inode to associate with the vnode. */
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lfs_vcreate(pvp->v_mount, new_ino, vp);
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ip = VTOI(vp);
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LFS_SET_UINO(ip, IN_CHANGE);
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/* on-disk structure has been zeroed out by lfs_vcreate */
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ip->i_din.ffs1_din->di_inumber = new_ino;
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/* Set a new generation number for this inode. */
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if (new_gen) {
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ip->i_gen = new_gen;
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ip->i_ffs1_gen = new_gen;
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}
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/* Insert into the inode hash table. */
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ufs_ihashins(ip);
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lockmgr(&ufs_hashlock, LK_RELEASE, 0);
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ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp);
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ip = VTOI(vp);
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memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize));
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uvm_vnp_setsize(vp, 0);
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*vpp = vp;
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lfs_mark_vnode(vp);
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genfs_node_init(vp, &lfs_genfsops);
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VREF(ip->i_devvp);
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/* Set superblock modified bit and increment file count. */
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fs->lfs_fmod = 1;
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++fs->lfs_nfiles;
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return (0);
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errout:
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/*
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* Put the new inum back on the free list.
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*/
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lfs_seglock(fs, SEGM_PROT);
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LFS_IENTRY(ifp, fs, new_ino, bp);
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ifp->if_daddr = LFS_UNUSED_DADDR;
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LFS_GET_HEADFREE(fs, cip, cbp, &(ifp->if_nextfree));
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LFS_PUT_HEADFREE(fs, cip, cbp, new_ino);
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(void) LFS_BWRITE_LOG(bp); /* Ifile */
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lfs_segunlock(fs);
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*vpp = NULLVP;
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return (error);
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}
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/* Create a new vnode/inode pair and initialize what fields we can. */
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void
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lfs_vcreate(struct mount *mp, ino_t ino, struct vnode *vp)
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{
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struct inode *ip;
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struct ufs1_dinode *dp;
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struct ufsmount *ump;
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int i;
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/* Get a pointer to the private mount structure. */
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ump = VFSTOUFS(mp);
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/* Initialize the inode. */
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ip = pool_get(&lfs_inode_pool, PR_WAITOK);
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memset(ip, 0, sizeof(*ip));
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dp = pool_get(&lfs_dinode_pool, PR_WAITOK);
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memset(dp, 0, sizeof(*dp));
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ip->inode_ext.lfs = pool_get(&lfs_inoext_pool, PR_WAITOK);
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memset(ip->inode_ext.lfs, 0, sizeof(*ip->inode_ext.lfs));
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for (i = 0; i < LFS_BLIST_HASH_WIDTH; i++)
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LIST_INIT(&(ip->i_lfs_blist[i]));
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vp->v_data = ip;
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ip->i_din.ffs1_din = dp;
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ip->i_ump = ump;
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ip->i_vnode = vp;
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ip->i_devvp = ump->um_devvp;
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ip->i_dev = ump->um_dev;
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ip->i_number = dp->di_inumber = ino;
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ip->i_lfs = ump->um_lfs;
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ip->i_lfs_effnblks = 0;
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#ifdef QUOTA
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for (i = 0; i < MAXQUOTAS; i++)
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ip->i_dquot[i] = NODQUOT;
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#endif
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#ifdef DEBUG
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if (ino == LFS_IFILE_INUM)
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vp->v_vnlock->lk_wmesg = "inlock";
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#endif
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}
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/* Free an inode. */
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/* ARGUSED */
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/* VOP_BWRITE 2i times */
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int
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lfs_vfree(void *v)
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{
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|
struct vop_vfree_args /* {
|
|
struct vnode *a_pvp;
|
|
ino_t a_ino;
|
|
int a_mode;
|
|
} */ *ap = v;
|
|
SEGUSE *sup;
|
|
CLEANERINFO *cip;
|
|
struct buf *cbp, *bp;
|
|
struct ifile *ifp;
|
|
struct inode *ip;
|
|
struct vnode *vp;
|
|
struct lfs *fs;
|
|
daddr_t old_iaddr;
|
|
ino_t ino, otail;
|
|
int s;
|
|
|
|
/* Get the inode number and file system. */
|
|
vp = ap->a_pvp;
|
|
ip = VTOI(vp);
|
|
fs = ip->i_lfs;
|
|
ino = ip->i_number;
|
|
|
|
/* Drain of pending writes */
|
|
s = splbio();
|
|
if (fs->lfs_version > 1 && WRITEINPROG(vp))
|
|
tsleep(vp, (PRIBIO+1), "lfs_vfree", 0);
|
|
splx(s);
|
|
|
|
lfs_seglock(fs, SEGM_PROT);
|
|
|
|
lfs_unmark_vnode(vp);
|
|
if (vp->v_flag & VDIROP) {
|
|
--lfs_dirvcount;
|
|
vp->v_flag &= ~VDIROP;
|
|
TAILQ_REMOVE(&fs->lfs_dchainhd, ip, i_lfs_dchain);
|
|
wakeup(&lfs_dirvcount);
|
|
lfs_vunref(vp);
|
|
}
|
|
|
|
LFS_CLR_UINO(ip, IN_ACCESSED|IN_CLEANING|IN_MODIFIED);
|
|
ip->i_flag &= ~IN_ALLMOD;
|
|
|
|
/*
|
|
* Set the ifile's inode entry to unused, increment its version number
|
|
* and link it onto the free chain.
|
|
*/
|
|
LFS_IENTRY(ifp, fs, ino, bp);
|
|
old_iaddr = ifp->if_daddr;
|
|
ifp->if_daddr = LFS_UNUSED_DADDR;
|
|
++ifp->if_version;
|
|
if (fs->lfs_version == 1) {
|
|
LFS_GET_HEADFREE(fs, cip, cbp, &(ifp->if_nextfree));
|
|
LFS_PUT_HEADFREE(fs, cip, cbp, ino);
|
|
(void) LFS_BWRITE_LOG(bp); /* Ifile */
|
|
} else {
|
|
ifp->if_nextfree = LFS_UNUSED_INUM;
|
|
/*
|
|
* XXX Writing the freed node here means that it might not
|
|
* XXX make it into the free list in the event of a crash
|
|
* XXX (the ifile could be written before the rest of this
|
|
* XXX completes).
|
|
*/
|
|
(void) LFS_BWRITE_LOG(bp); /* Ifile */
|
|
LFS_GET_TAILFREE(fs, cip, cbp, &otail);
|
|
LFS_IENTRY(ifp, fs, otail, bp);
|
|
ifp->if_nextfree = ino;
|
|
LFS_BWRITE_LOG(bp);
|
|
LFS_PUT_TAILFREE(fs, cip, cbp, ino);
|
|
DLOG((DLOG_ALLOC, "lfs_vfree: tailfree %d -> %d\n", otail,
|
|
ino));
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (ino == LFS_UNUSED_INUM) {
|
|
panic("inode 0 freed");
|
|
}
|
|
#endif /* DIAGNOSTIC */
|
|
if (old_iaddr != LFS_UNUSED_DADDR) {
|
|
LFS_SEGENTRY(sup, fs, dtosn(fs, old_iaddr), bp);
|
|
#ifdef DIAGNOSTIC
|
|
if (sup->su_nbytes < sizeof (struct ufs1_dinode)) {
|
|
printf("lfs_vfree: negative byte count"
|
|
" (segment %" PRIu32 " short by %d)\n",
|
|
dtosn(fs, old_iaddr),
|
|
(int)sizeof (struct ufs1_dinode) -
|
|
sup->su_nbytes);
|
|
panic("lfs_vfree: negative byte count");
|
|
sup->su_nbytes = sizeof (struct ufs1_dinode);
|
|
}
|
|
#endif
|
|
sup->su_nbytes -= sizeof (struct ufs1_dinode);
|
|
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, old_iaddr), bp); /* Ifile */
|
|
}
|
|
|
|
/* Set superblock modified bit and decrement file count. */
|
|
fs->lfs_fmod = 1;
|
|
--fs->lfs_nfiles;
|
|
|
|
lfs_segunlock(fs);
|
|
|
|
return (0);
|
|
}
|