ufs_inode.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 174 行

/*	$NetBSD: ufs_inode.c,v 1.7 1996/05/11 18:27:52 mycroft Exp $	*/

/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ufs_inode.c	8.7 (Berkeley) 7/22/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/namei.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>

u_long	nextgennumber;		/* Next generation number to assign. */

void
ufs_init()
{
	static int done = 0;

	if (done)
		return;
	done = 1;
	ufs_ihashinit();
#ifdef QUOTA
	dqinit();
#endif
	return;
}

/*
 * Last reference to an inode.  If necessary, write or delete it.
 */
int
ufs_inactive(v)
	void *v;
{
	struct vop_inactive_args /* {
		struct vnode *a_vp;
	} */ *ap = v;
	register struct vnode *vp = ap->a_vp;
	register struct inode *ip = VTOI(vp);
	struct timespec ts;
	int mode, error;
	extern int prtactive;

	if (prtactive && vp->v_usecount != 0)
		vprint("ffs_inactive: pushing active", vp);

	/* Get rid of inodes related to stale file handles. */
	if (ip->i_mode == 0) {
		if ((vp->v_flag & VXLOCK) == 0)
			vgone(vp);
		return (0);
	}

	error = 0;
#ifdef DIAGNOSTIC
	if (VOP_ISLOCKED(vp))
		panic("ffs_inactive: locked inode");
	if (curproc)
		ip->i_lockholder = curproc->p_pid;
	else
		ip->i_lockholder = -1;
#endif
	ip->i_flag |= IN_LOCKED;
	if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
#ifdef QUOTA
		if (!getinoquota(ip))
			(void)chkiq(ip, -1, NOCRED, 0);
#endif
		error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, NULL);
		ip->i_rdev = 0;
		mode = ip->i_mode;
		ip->i_mode = 0;
		ip->i_flag |= IN_CHANGE | IN_UPDATE;
		VOP_VFREE(vp, ip->i_number, mode);
	}
	if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
		TIMEVAL_TO_TIMESPEC(&time, &ts);
		VOP_UPDATE(vp, &ts, &ts, 0);
	}
	VOP_UNLOCK(vp);
	/*
	 * If we are done with the inode, reclaim it
	 * so that it can be reused immediately.
	 */
	if (vp->v_usecount == 0 && ip->i_mode == 0)
		vgone(vp);
	return (error);
}

/*
 * Reclaim an inode so that it can be used for other purposes.
 */
int
ufs_reclaim(vp)
	register struct vnode *vp;
{
	register struct inode *ip;
	extern int prtactive;

	if (prtactive && vp->v_usecount != 0)
		vprint("ufs_reclaim: pushing active", vp);
	/*
	 * Remove the inode from its hash chain.
	 */
	ip = VTOI(vp);
	ufs_ihashrem(ip);
	/*
	 * Purge old data structures associated with the inode.
	 */
	cache_purge(vp);
	if (ip->i_devvp) {
		vrele(ip->i_devvp);
		ip->i_devvp = 0;
	}
#ifdef QUOTA
	{
		int i;
		for (i = 0; i < MAXQUOTAS; i++) {
			if (ip->i_dquot[i] != NODQUOT) {
				dqrele(vp, ip->i_dquot[i]);
				ip->i_dquot[i] = NODQUOT;
			}
		}
	}
#endif
	return (0);
}