1 /* $OpenBSD: ntfs_ihash.c,v 1.3 2003/06/02 23:28:20 millert Exp $ */
2 /* $NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
33 * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
34 */
35
36 #include <sys/cdefs.h>
37 #ifdef __KERNEL_RCSID
38 __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $");
39 #endif
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/lock.h>
45 #include <sys/vnode.h>
46 #include <sys/malloc.h>
47 #include <sys/proc.h>
48 #include <sys/mount.h>
49
50 #if defined(__FreeBSD__) || defined(__NetBSD__)
51 #include <fs/ntfs/ntfs.h>
52 #include <fs/ntfs/ntfs_inode.h>
53 #include <fs/ntfs/ntfs_ihash.h>
54 #else
55 #include <ntfs/ntfs.h>
56 #include <ntfs/ntfs_inode.h>
57 #include <ntfs/ntfs_ihash.h>
58 #endif
59
60 #ifdef MALLOC_DEFINE
61 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
62 #endif
63
64 /*
65 * Structures associated with inode cacheing.
66 */
67 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
68 static u_long ntfs_nthash; /* size of hash table - 1 */
69 #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash)
70 #ifndef NULL_SIMPLELOCKS
71 static struct simplelock ntfs_nthash_slock;
72 #endif
73 struct lock ntfs_hashlock;
74
75 /*
76 * Initialize inode hash table.
77 */
78 void
ntfs_nthashinit()79 ntfs_nthashinit()
80 {
81 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
82 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
83 &ntfs_nthash);
84 simple_lock_init(&ntfs_nthash_slock);
85 }
86
87 #ifdef __NetBSD__
88 /*
89 * Reinitialize inode hash table.
90 */
91
92 void
ntfs_nthashreinit()93 ntfs_nthashreinit()
94 {
95 struct ntnode *ip;
96 struct nthashhead *oldhash, *hash;
97 u_long oldmask, mask, val;
98 int i;
99
100 hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask);
101
102 simple_lock(&ntfs_nthash_slock);
103 oldhash = ntfs_nthashtbl;
104 oldmask = ntfs_nthash;
105 ntfs_nthashtbl = hash;
106 ntfs_nthash = mask;
107 for (i = 0; i <= oldmask; i++) {
108 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
109 LIST_REMOVE(ip, i_hash);
110 val = NTNOHASH(ip->i_dev, ip->i_number);
111 LIST_INSERT_HEAD(&hash[val], ip, i_hash);
112 }
113 }
114 simple_unlock(&ntfs_nthash_slock);
115 hashdone(oldhash, M_NTFSNTHASH);
116 }
117
118 /*
119 * Free the inode hash table. Called from ntfs_done(), only needed
120 * on NetBSD.
121 */
122 void
ntfs_nthashdone()123 ntfs_nthashdone()
124 {
125 hashdone(ntfs_nthashtbl, M_NTFSNTHASH);
126 }
127 #endif
128
129 /*
130 * Use the device/inum pair to find the incore inode, and return a pointer
131 * to it. If it is in core, return it, even if it is locked.
132 */
133 struct ntnode *
ntfs_nthashlookup(dev,inum)134 ntfs_nthashlookup(dev, inum)
135 dev_t dev;
136 ino_t inum;
137 {
138 struct ntnode *ip;
139 struct nthashhead *ipp;
140
141 simple_lock(&ntfs_nthash_slock);
142 ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
143 LIST_FOREACH(ip, ipp, i_hash) {
144 if (inum == ip->i_number && dev == ip->i_dev)
145 break;
146 }
147 simple_unlock(&ntfs_nthash_slock);
148
149 return (ip);
150 }
151
152 /*
153 * Insert the ntnode into the hash table.
154 */
155 void
ntfs_nthashins(ip)156 ntfs_nthashins(ip)
157 struct ntnode *ip;
158 {
159 struct nthashhead *ipp;
160
161 simple_lock(&ntfs_nthash_slock);
162 ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
163 LIST_INSERT_HEAD(ipp, ip, i_hash);
164 ip->i_flag |= IN_HASHED;
165 simple_unlock(&ntfs_nthash_slock);
166 }
167
168 /*
169 * Remove the inode from the hash table.
170 */
171 void
ntfs_nthashrem(ip)172 ntfs_nthashrem(ip)
173 struct ntnode *ip;
174 {
175 simple_lock(&ntfs_nthash_slock);
176 if (ip->i_flag & IN_HASHED) {
177 ip->i_flag &= ~IN_HASHED;
178 LIST_REMOVE(ip, i_hash);
179 }
180 simple_unlock(&ntfs_nthash_slock);
181 }
182