NetBSD/sys/filecorefs/filecore_node.c

211 lines
5.6 KiB
C

/* $NetBSD: filecore_node.c,v 1.2 1998/08/14 18:04:05 mark Exp $ */
/*-
* Copyright (c) 1998 Andrew McMurry
* Copyright (c) 1982, 1986, 1989, 1994
* The Regents of the University of California.
* All rights reserved.
*
* 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.
*
* filecore_node.c 1.0 1998/6/4
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <filecorefs/filecore.h>
#include <filecorefs/filecore_extern.h>
#include <filecorefs/filecore_node.h>
#include <filecorefs/filecore_mount.h>
/*
* Structures associated with filecore_node caching.
*/
struct filecore_node **filecorehashtbl;
u_long filecorehash;
#define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash)
struct simplelock filecore_ihash_slock;
int prtactive; /* 1 => print out reclaim of active vnodes */
/*
* Initialize hash links for inodes and dnodes.
*/
void
filecore_init()
{
filecorehashtbl = hashinit(desiredvnodes, M_FILECOREMNT, M_WAITOK,
&filecorehash);
simple_lock_init(&filecore_ihash_slock);
}
/*
* Use the device/inum pair to find the incore inode, and return a pointer
* to it. If it is in core, but locked, wait for it.
*/
struct vnode *
filecore_ihashget(dev, inum)
dev_t dev;
ino_t inum;
{
struct filecore_node *ip;
struct vnode *vp;
loop:
simple_lock(&filecore_ihash_slock);
for (ip = filecorehashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
if (inum == ip->i_number && dev == ip->i_dev) {
vp = ITOV(ip);
simple_lock(&vp->v_interlock);
simple_unlock(&filecore_ihash_slock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
goto loop;
return (vp);
}
}
simple_unlock(&filecore_ihash_slock);
return (NULL);
}
/*
* Insert the inode into the hash table, and return it locked.
*/
void
filecore_ihashins(ip)
struct filecore_node *ip;
{
struct filecore_node **ipp, *iq;
simple_lock(&filecore_ihash_slock);
ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
if ((iq = *ipp) != NULL)
iq->i_prev = &ip->i_next;
ip->i_next = iq;
ip->i_prev = ipp;
*ipp = ip;
simple_unlock(&filecore_ihash_slock);
lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0);
}
/*
* Remove the inode from the hash table.
*/
void
filecore_ihashrem(ip)
struct filecore_node *ip;
{
struct filecore_node *iq;
simple_lock(&filecore_ihash_slock);
if ((iq = ip->i_next) != NULL)
iq->i_prev = ip->i_prev;
*ip->i_prev = iq;
#ifdef DIAGNOSTIC
ip->i_next = NULL;
ip->i_prev = NULL;
#endif
simple_unlock(&filecore_ihash_slock);
}
/*
* Last reference to an inode, write the inode out and if necessary,
* truncate and deallocate the file.
*/
int
filecore_inactive(v)
void *v;
{
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct proc *p = ap->a_p;
struct filecore_node *ip = VTOI(vp);
int error = 0;
if (prtactive && vp->v_usecount != 0)
vprint("filecore_inactive: pushing active", vp);
ip->i_flag = 0;
VOP_UNLOCK(vp, 0);
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
if (filecore_staleinode(ip))
vrecycle(vp, (struct simplelock *)0, p);
return error;
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
filecore_reclaim(v)
void *v;
{
struct vop_reclaim_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct filecore_node *ip = VTOI(vp);
if (prtactive && vp->v_usecount != 0)
vprint("filecore_reclaim: pushing active", vp);
/*
* Remove the inode from its hash chain.
*/
filecore_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;
}
FREE(vp->v_data, M_FILECORENODE);
vp->v_data = NULL;
return (0);
}