161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/* $NetBSD: ntfs_ihash.c,v 1.11 2015/02/20 17:08:13 maxv 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.11 2015/02/20 17:08:13 maxv Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/mallocvar.h>
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#include <fs/ntfs/ntfs.h>
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#include <fs/ntfs/ntfs_inode.h>
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#include <fs/ntfs/ntfs_ihash.h>
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/*
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* Structures associated with inode cacheing.
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*/
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static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
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static u_long ntfs_nthash; /* size of hash table - 1 */
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#define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash)
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static kmutex_t ntfs_nthash_lock;
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kmutex_t ntfs_hashlock;
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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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mutex_init(&ntfs_hashlock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&ntfs_nthash_lock, MUTEX_DEFAULT, IPL_NONE);
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ntfs_nthashtbl = hashinit(desiredvnodes, HASH_LIST, true, &ntfs_nthash);
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}
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/*
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* Reinitialize inode hash table.
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*/
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void
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ntfs_nthashreinit(void)
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{
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struct ntnode *ip;
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struct nthashhead *oldhash, *hash;
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u_long oldmask, mask, val;
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int i;
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hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
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mutex_enter(&ntfs_nthash_lock);
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oldhash = ntfs_nthashtbl;
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oldmask = ntfs_nthash;
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ntfs_nthashtbl = hash;
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ntfs_nthash = mask;
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for (i = 0; i <= oldmask; i++) {
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while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
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LIST_REMOVE(ip, i_hash);
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val = NTNOHASH(ip->i_dev, ip->i_number);
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LIST_INSERT_HEAD(&hash[val], ip, i_hash);
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}
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}
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mutex_exit(&ntfs_nthash_lock);
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hashdone(oldhash, HASH_LIST, oldmask);
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}
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/*
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* Free the inode hash table. Called from ntfs_done(), only needed
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* on NetBSD.
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*/
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void
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ntfs_nthashdone(void)
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{
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hashdone(ntfs_nthashtbl, HASH_LIST, ntfs_nthash);
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mutex_destroy(&ntfs_hashlock);
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mutex_destroy(&ntfs_nthash_lock);
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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, ino_t inum)
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{
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struct ntnode *ip;
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struct nthashhead *ipp;
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mutex_enter(&ntfs_nthash_lock);
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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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mutex_exit(&ntfs_nthash_lock);
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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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mutex_enter(&ntfs_nthash_lock);
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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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mutex_exit(&ntfs_nthash_lock);
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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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mutex_enter(&ntfs_nthash_lock);
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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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mutex_exit(&ntfs_nthash_lock);
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}
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