/*
 * 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.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)ufs_inode.c	8.6 (Berkeley) 06/16/94
 */

#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 <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. */
int	prtactive = 0;		/* 1 => print out reclaim of active vnodes */

int
ufs_init()
{
	static int first = 1;

	if (!first)
		return (0);
	first = 0;

#ifdef DIAGNOSTIC
	if ((sizeof(struct inode) - 1) & sizeof(struct inode))
		printf("ufs_init: bad size %d\n", sizeof(struct inode));
#endif
	ufs_ihashinit();
#ifdef QUOTA
	dqinit();
#endif
	return (0);
}

/*
 * Last reference to an inode.  If necessary, write or delete it.
 */
int
ufs_inactive(ap)
	struct vop_inactive_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct inode *ip = VTOI(vp);
	struct timeval tv;
	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)) {
		tv = time;
		VOP_UPDATE(vp, &tv, &tv, 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;
	int i;
	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
	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);
}