1 /* $NetBSD: ntfs_ihash.c,v 1.3 2005/12/11 12:24:29 christos 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. 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 * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.3 2005/12/11 12:24:29 christos Exp $");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/vnode.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 #include <sys/mount.h>
46
47 #include <fs/ntfs/ntfs.h>
48 #include <fs/ntfs/ntfs_inode.h>
49 #include <fs/ntfs/ntfs_ihash.h>
50
51 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
52
53 /*
54 * Structures associated with inode cacheing.
55 */
56 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
57 static u_long ntfs_nthash; /* size of hash table - 1 */
58 #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash)
59 #ifndef NULL_SIMPLELOCKS
60 static struct simplelock ntfs_nthash_slock;
61 #endif
62 struct lock ntfs_hashlock;
63
64 /*
65 * Initialize inode hash table.
66 */
67 void
68 ntfs_nthashinit()
69 {
70 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
71 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
72 &ntfs_nthash);
73 simple_lock_init(&ntfs_nthash_slock);
74 }
75
76 #ifdef __NetBSD__
77 /*
78 * Reinitialize inode hash table.
79 */
80
81 void
82 ntfs_nthashreinit()
83 {
84 struct ntnode *ip;
85 struct nthashhead *oldhash, *hash;
86 u_long oldmask, mask, val;
87 int i;
88
89 hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask);
90
91 simple_lock(&ntfs_nthash_slock);
92 oldhash = ntfs_nthashtbl;
93 oldmask = ntfs_nthash;
94 ntfs_nthashtbl = hash;
95 ntfs_nthash = mask;
96 for (i = 0; i <= oldmask; i++) {
97 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
98 LIST_REMOVE(ip, i_hash);
99 val = NTNOHASH(ip->i_dev, ip->i_number);
100 LIST_INSERT_HEAD(&hash[val], ip, i_hash);
101 }
102 }
103 simple_unlock(&ntfs_nthash_slock);
104 hashdone(oldhash, M_NTFSNTHASH);
105 }
106
107 /*
108 * Free the inode hash table. Called from ntfs_done(), only needed
109 * on NetBSD.
110 */
111 void
112 ntfs_nthashdone()
113 {
114 hashdone(ntfs_nthashtbl, M_NTFSNTHASH);
115 }
116 #endif
117
118 /*
119 * Use the device/inum pair to find the incore inode, and return a pointer
120 * to it. If it is in core, return it, even if it is locked.
121 */
122 struct ntnode *
123 ntfs_nthashlookup(dev, inum)
124 dev_t dev;
125 ino_t inum;
126 {
127 struct ntnode *ip;
128 struct nthashhead *ipp;
129
130 simple_lock(&ntfs_nthash_slock);
131 ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
132 LIST_FOREACH(ip, ipp, i_hash) {
133 if (inum == ip->i_number && dev == ip->i_dev)
134 break;
135 }
136 simple_unlock(&ntfs_nthash_slock);
137
138 return (ip);
139 }
140
141 /*
142 * Insert the ntnode into the hash table.
143 */
144 void
145 ntfs_nthashins(ip)
146 struct ntnode *ip;
147 {
148 struct nthashhead *ipp;
149
150 simple_lock(&ntfs_nthash_slock);
151 ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
152 LIST_INSERT_HEAD(ipp, ip, i_hash);
153 ip->i_flag |= IN_HASHED;
154 simple_unlock(&ntfs_nthash_slock);
155 }
156
157 /*
158 * Remove the inode from the hash table.
159 */
160 void
161 ntfs_nthashrem(ip)
162 struct ntnode *ip;
163 {
164 simple_lock(&ntfs_nthash_slock);
165 if (ip->i_flag & IN_HASHED) {
166 ip->i_flag &= ~IN_HASHED;
167 LIST_REMOVE(ip, i_hash);
168 }
169 simple_unlock(&ntfs_nthash_slock);
170 }
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