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ufs_ihash.c
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ufs_ihash.c
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/* $OpenBSD: ufs_ihash.c,v 1.26 2021/10/19 06:11:45 semarie Exp $ */
/* $NetBSD: ufs_ihash.c,v 1.3 1996/02/09 22:36:04 christos Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
* 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. 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_ihash.c 8.4 (Berkeley) 12/30/93
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <crypto/siphash.h>
/*
* Structures associated with inode caching.
*/
LIST_HEAD(ihashhead, inode) *ihashtbl;
u_long ihash; /* size of hash table - 1 */
SIPHASH_KEY ihashkey;
struct ihashhead *ufs_ihash(dev_t, ufsino_t);
#define INOHASH(device, inum) ufs_ihash((device), (inum))
struct ihashhead *
ufs_ihash(dev_t dev, ufsino_t inum)
{
SIPHASH_CTX ctx;
SipHash24_Init(&ctx, &ihashkey);
SipHash24_Update(&ctx, &dev, sizeof(dev));
SipHash24_Update(&ctx, &inum, sizeof(inum));
return (&ihashtbl[SipHash24_End(&ctx) & ihash]);
}
/*
* Initialize inode hash table.
*/
void
ufs_ihashinit(void)
{
ihashtbl = hashinit(initialvnodes, M_UFSMNT, M_WAITOK, &ihash);
arc4random_buf(&ihashkey, sizeof(ihashkey));
}
/*
* Use the device/inum pair to find the incore inode, and return a pointer
* to it. If it is in core, return it, even if it is locked.
*/
struct vnode *
ufs_ihashlookup(dev_t dev, ufsino_t inum)
{
struct inode *ip;
struct ihashhead *ipp;
/* XXXLOCKING lock hash list */
ipp = INOHASH(dev, inum);
LIST_FOREACH(ip, ipp, i_hash) {
if (inum == ip->i_number && dev == ip->i_dev)
break;
}
/* XXXLOCKING unlock hash list? */
if (ip)
return (ITOV(ip));
return (NULLVP);
}
/*
* 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 *
ufs_ihashget(dev_t dev, ufsino_t inum)
{
struct ihashhead *ipp;
struct inode *ip;
struct vnode *vp;
loop:
/* XXXLOCKING lock hash list */
ipp = INOHASH(dev, inum);
LIST_FOREACH(ip, ipp, i_hash) {
if (inum == ip->i_number && dev == ip->i_dev) {
vp = ITOV(ip);
/* XXXLOCKING unlock hash list? */
if (vget(vp, LK_EXCLUSIVE))
goto loop;
return (vp);
}
}
/* XXXLOCKING unlock hash list? */
return (NULL);
}
/*
* Insert the inode into the hash table, and return it locked.
*/
int
ufs_ihashins(struct inode *ip)
{
struct inode *curip;
struct ihashhead *ipp;
dev_t dev = ip->i_dev;
ufsino_t inum = ip->i_number;
/* lock the inode, then put it on the appropriate hash list */
VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
/* XXXLOCKING lock hash list */
ipp = INOHASH(dev, inum);
LIST_FOREACH(curip, ipp, i_hash) {
if (inum == curip->i_number && dev == curip->i_dev) {
/* XXXLOCKING unlock hash list? */
VOP_UNLOCK(ITOV(ip));
return (EEXIST);
}
}
SET(ip->i_flag, IN_HASHED);
LIST_INSERT_HEAD(ipp, ip, i_hash);
/* XXXLOCKING unlock hash list? */
return (0);
}
/*
* Remove the inode from the hash table.
*/
void
ufs_ihashrem(struct inode *ip)
{
/* XXXLOCKING lock hash list */
if (ip->i_hash.le_prev == NULL)
return;
if (ISSET(ip->i_flag, IN_HASHED)) {
LIST_REMOVE(ip, i_hash);
CLR(ip->i_flag, IN_HASHED);
}
#ifdef DIAGNOSTIC
ip->i_hash.le_next = NULL;
ip->i_hash.le_prev = NULL;
#endif
/* XXXLOCKING unlock hash list? */
}