1 /* $NetBSD: ntfs_ihash.c,v 1.5 1999/09/30 16:56:40 jdolecek Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
22 *
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
33 * SUCH DAMAGE.
34 *
35 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
36 * $FreeBSD: releng/5.0/sys/fs/ntfs/ntfs_ihash.c 93818 2002-04-04 21:03:38Z jhb $
37 */
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/vnode.h>
44 #include <sys/malloc.h>
45 #include <sys/mount.h>
46 #include <sys/mutex.h>
47
48 #include <fs/ntfs/ntfs.h>
49 #include <fs/ntfs/ntfs_inode.h>
50 #include <fs/ntfs/ntfs_ihash.h>
51
52 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
53
54 /*
55 * Structures associated with inode cacheing.
56 */
57 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
58 static u_long ntfs_nthash; /* size of hash table - 1 */
59 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash])
60 static struct mtx ntfs_nthash_mtx;
61 struct lock ntfs_hashlock;
62
63 /*
64 * Initialize inode hash table.
65 */
66 void
67 ntfs_nthashinit()
68 {
69 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
70 ntfs_nthashtbl = hashinit(desiredvnodes, M_NTFSNTHASH, &ntfs_nthash);
71 mtx_init(&ntfs_nthash_mtx, "ntfs nthash", NULL, MTX_DEF);
72 }
73
74 /*
75 * Destroy inode hash table.
76 */
77 void
78 ntfs_nthashdestroy(void)
79 {
80 lockdestroy(&ntfs_hashlock);
81 mtx_destroy(&ntfs_nthash_mtx);
82 }
83
84 /*
85 * Use the device/inum pair to find the incore inode, and return a pointer
86 * to it. If it is in core, return it, even if it is locked.
87 */
88 struct ntnode *
89 ntfs_nthashlookup(dev, inum)
90 dev_t dev;
91 ino_t inum;
92 {
93 struct ntnode *ip;
94
95 mtx_lock(&ntfs_nthash_mtx);
96 LIST_FOREACH(ip, NTNOHASH(dev, inum), i_hash)
97 if (inum == ip->i_number && dev == ip->i_dev)
98 break;
99 mtx_unlock(&ntfs_nthash_mtx);
100
101 return (ip);
102 }
103
104 /*
105 * Insert the ntnode into the hash table.
106 */
107 void
108 ntfs_nthashins(ip)
109 struct ntnode *ip;
110 {
111 struct nthashhead *ipp;
112
113 mtx_lock(&ntfs_nthash_mtx);
114 ipp = NTNOHASH(ip->i_dev, ip->i_number);
115 LIST_INSERT_HEAD(ipp, ip, i_hash);
116 ip->i_flag |= IN_HASHED;
117 mtx_unlock(&ntfs_nthash_mtx);
118 }
119
120 /*
121 * Remove the inode from the hash table.
122 */
123 void
124 ntfs_nthashrem(ip)
125 struct ntnode *ip;
126 {
127 mtx_lock(&ntfs_nthash_mtx);
128 if (ip->i_flag & IN_HASHED) {
129 ip->i_flag &= ~IN_HASHED;
130 LIST_REMOVE(ip, i_hash);
131 }
132 mtx_unlock(&ntfs_nthash_mtx);
133 }
Cache object: 09631c32a182fa02362d0fc322677eda
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