143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/* $OpenBSD: ntfs_ihash.c,v 1.21 2021/03/11 13:31:35 jsg Exp $ */
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/* $NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
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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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* @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
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* Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/rwlock.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <crypto/siphash.h>
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#include <ntfs/ntfs.h>
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#include <ntfs/ntfs_inode.h>
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#include <ntfs/ntfs_ihash.h>
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/*
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* Structures associated with inode caching.
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*/
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u_int ntfs_hash(dev_t, ntfsino_t);
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static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
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static SIPHASH_KEY ntfs_nthashkey;
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static u_long ntfs_nthash; /* size of hash table - 1 */
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#define NTNOHASH(device, inum) ntfs_hash((device), (inum))
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struct rwlock ntfs_hashlock = RWLOCK_INITIALIZER("ntfs_nthashlock");
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/*
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* Initialize inode hash table.
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*/
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void
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ntfs_nthashinit(void)
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{
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u_long nthash;
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void *nthashtbl;
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if (ntfs_nthashtbl)
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return;
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nthashtbl = hashinit(initialvnodes, M_NTFSNTHASH, M_WAITOK, &nthash);
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if (ntfs_nthashtbl) {
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hashfree(nthashtbl, initialvnodes, M_NTFSNTHASH);
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return;
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}
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ntfs_nthashtbl = nthashtbl;
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ntfs_nthash = nthash;
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arc4random_buf(&ntfs_nthashkey, sizeof(ntfs_nthashkey));
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}
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u_int
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ntfs_hash(dev_t dev, ntfsino_t inum)
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{
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SIPHASH_CTX ctx;
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SipHash24_Init(&ctx, &ntfs_nthashkey);
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SipHash24_Update(&ctx, &dev, sizeof(dev));
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SipHash24_Update(&ctx, &inum, sizeof(inum));
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return (SipHash24_End(&ctx) & ntfs_nthash);
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}
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/*
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* Use the device/inum pair to find the incore inode, and return a pointer
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* to it. If it is in core, return it, even if it is locked.
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*/
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struct ntnode *
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ntfs_nthashlookup(dev_t dev, ntfsino_t inum)
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{
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struct ntnode *ip;
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struct nthashhead *ipp;
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/* XXXLOCKING lock hash list? */
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ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
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LIST_FOREACH(ip, ipp, i_hash) {
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if (inum == ip->i_number && dev == ip->i_dev)
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break;
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}
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/* XXXLOCKING unlock hash list? */
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return (ip);
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}
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/*
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* Insert the ntnode into the hash table.
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*/
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void
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ntfs_nthashins(struct ntnode *ip)
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{
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struct nthashhead *ipp;
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/* XXXLOCKING lock hash list? */
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ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
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LIST_INSERT_HEAD(ipp, ip, i_hash);
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ip->i_flag |= IN_HASHED;
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/* XXXLOCKING unlock hash list? */
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}
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/*
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* Remove the inode from the hash table.
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*/
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void
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ntfs_nthashrem(struct ntnode *ip)
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{
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/* XXXLOCKING lock hash list? */
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if (ip->i_flag & IN_HASHED) {
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ip->i_flag &= ~IN_HASHED;
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LIST_REMOVE(ip, i_hash);
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}
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/* XXXLOCKING unlock hash list? */
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}
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