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 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
32 * $FreeBSD: releng/6.0/sys/fs/ntfs/ntfs_ihash.c 139776 2005-01-06 18:10:42Z imp $
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/vnode.h>
40 #include <sys/malloc.h>
41 #include <sys/mount.h>
42 #include <sys/mutex.h>
43
44 #include <fs/ntfs/ntfs.h>
45 #include <fs/ntfs/ntfs_inode.h>
46 #include <fs/ntfs/ntfs_ihash.h>
47
48 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
49
50 /*
51 * Structures associated with inode cacheing.
52 */
53 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
54 static u_long ntfs_nthash; /* size of hash table - 1 */
55 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash])
56 static struct mtx ntfs_nthash_mtx;
57 struct lock ntfs_hashlock;
58
59 /*
60 * Initialize inode hash table.
61 */
62 void
63 ntfs_nthashinit()
64 {
65 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
66 ntfs_nthashtbl = hashinit(desiredvnodes, M_NTFSNTHASH, &ntfs_nthash);
67 mtx_init(&ntfs_nthash_mtx, "ntfs nthash", NULL, MTX_DEF);
68 }
69
70 /*
71 * Destroy inode hash table.
72 */
73 void
74 ntfs_nthashdestroy(void)
75 {
76 lockdestroy(&ntfs_hashlock);
77 mtx_destroy(&ntfs_nthash_mtx);
78 }
79
80 /*
81 * Use the device/inum pair to find the incore inode, and return a pointer
82 * to it. If it is in core, return it, even if it is locked.
83 */
84 struct ntnode *
85 ntfs_nthashlookup(dev, inum)
86 struct cdev *dev;
87 ino_t inum;
88 {
89 struct ntnode *ip;
90
91 mtx_lock(&ntfs_nthash_mtx);
92 LIST_FOREACH(ip, NTNOHASH(dev, inum), i_hash)
93 if (inum == ip->i_number && dev == ip->i_dev)
94 break;
95 mtx_unlock(&ntfs_nthash_mtx);
96
97 return (ip);
98 }
99
100 /*
101 * Insert the ntnode into the hash table.
102 */
103 void
104 ntfs_nthashins(ip)
105 struct ntnode *ip;
106 {
107 struct nthashhead *ipp;
108
109 mtx_lock(&ntfs_nthash_mtx);
110 ipp = NTNOHASH(ip->i_dev, ip->i_number);
111 LIST_INSERT_HEAD(ipp, ip, i_hash);
112 ip->i_flag |= IN_HASHED;
113 mtx_unlock(&ntfs_nthash_mtx);
114 }
115
116 /*
117 * Remove the inode from the hash table.
118 */
119 void
120 ntfs_nthashrem(ip)
121 struct ntnode *ip;
122 {
123 mtx_lock(&ntfs_nthash_mtx);
124 if (ip->i_flag & IN_HASHED) {
125 ip->i_flag &= ~IN_HASHED;
126 LIST_REMOVE(ip, i_hash);
127 }
128 mtx_unlock(&ntfs_nthash_mtx);
129 }
Cache object: 2a22a46ed7626b22b4101349c70695b1
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