1 /* $NetBSD: ntfs_ihash.c,v 1.5 1999/09/30 16:56:40 jdolecek Exp $ */
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
36 * $FreeBSD: src/sys/ntfs/ntfs_ihash.c,v 1.7 1999/12/03 20:37:39 semenu Exp $
37 * $DragonFly: src/sys/vfs/ntfs/ntfs_ihash.c,v 1.12 2006/09/10 01:26:41 dillon Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
44 #include <sys/vnode.h>
45 #include <sys/malloc.h>
47 #include <sys/mount.h>
50 #include "ntfs_inode.h"
51 #include "ntfs_ihash.h"
53 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
56 * Structures associated with inode cacheing.
58 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
59 static u_long ntfs_nthash; /* size of hash table - 1 */
60 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash])
61 static struct lwkt_token ntfs_nthash_slock;
62 struct lock ntfs_hashlock;
65 * Initialize inode hash table.
70 lockinit(&ntfs_hashlock, "ntfs_nthashlock", 0, 0);
71 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
73 lwkt_token_init(&ntfs_nthash_slock, "ntfsihash");
77 * Free the inode hash table.
80 ntfs_nthash_uninit(struct vfsconf *vfc)
82 lwkt_gettoken(&ntfs_nthash_slock);
84 kfree(ntfs_nthashtbl, M_NTFSNTHASH);
85 lwkt_reltoken(&ntfs_nthash_slock);
91 * Use the device/inum pair to find the incore inode, and return a pointer
92 * to it. If it is in core, return it, even if it is locked.
95 ntfs_nthashlookup(cdev_t dev, ino_t inum)
99 lwkt_gettoken(&ntfs_nthash_slock);
100 for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
101 if (inum == ip->i_number && dev == ip->i_dev)
104 lwkt_reltoken(&ntfs_nthash_slock);
110 * Insert the ntnode into the hash table.
113 ntfs_nthashins(struct ntnode *ip)
115 struct nthashhead *ipp;
117 lwkt_gettoken(&ntfs_nthash_slock);
118 ipp = NTNOHASH(ip->i_dev, ip->i_number);
119 LIST_INSERT_HEAD(ipp, ip, i_hash);
120 ip->i_flag |= IN_HASHED;
121 lwkt_reltoken(&ntfs_nthash_slock);
125 * Remove the inode from the hash table.
128 ntfs_nthashrem(struct ntnode *ip)
130 lwkt_gettoken(&ntfs_nthash_slock);
131 if (ip->i_flag & IN_HASHED) {
132 ip->i_flag &= ~IN_HASHED;
133 LIST_REMOVE(ip, i_hash);
135 ip->i_hash.le_next = NULL;
136 ip->i_hash.le_prev = NULL;
139 lwkt_reltoken(&ntfs_nthash_slock);