xref: /dragonfly/sys/vfs/ntfs/ntfs_ihash.c (revision 2ee85085)
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: 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 1.9 2004/04/20 19:59:30 cpressey Exp $
38  */
39 
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/vnode.h>
45 #include <sys/malloc.h>
46 #include <sys/proc.h>
47 #include <sys/mount.h>
48 
49 #include "ntfs.h"
50 #include "ntfs_inode.h"
51 #include "ntfs_ihash.h"
52 
53 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
54 
55 /*
56  * Structures associated with inode cacheing.
57  */
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;
63 
64 /*
65  * Initialize inode hash table.
66  */
67 void
68 ntfs_nthashinit(void)
69 {
70 	lockinit(&ntfs_hashlock, 0, "ntfs_nthashlock", 0, 0);
71 	ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
72 	    &ntfs_nthash);
73 	lwkt_token_init(&ntfs_nthash_slock);
74 }
75 
76 /*
77  * Free the inode hash table.
78  */
79 int
80 ntfs_nthash_uninit(struct vfsconf *vfc)
81 {
82 	lwkt_tokref ilock;
83 
84 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
85 	if (ntfs_nthashtbl)
86 		free(ntfs_nthashtbl, M_NTFSNTHASH);
87 	lwkt_reltoken(&ilock);
88 
89 	return 0;
90 }
91 
92 /*
93  * Use the device/inum pair to find the incore inode, and return a pointer
94  * to it. If it is in core, return it, even if it is locked.
95  */
96 struct ntnode *
97 ntfs_nthashlookup(dev_t dev, ino_t inum)
98 {
99 	struct ntnode *ip;
100 	lwkt_tokref ilock;
101 
102 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
103 	for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
104 		if (inum == ip->i_number && dev == ip->i_dev)
105 			break;
106 	}
107 	lwkt_reltoken(&ilock);
108 
109 	return (ip);
110 }
111 
112 /*
113  * Insert the ntnode into the hash table.
114  */
115 void
116 ntfs_nthashins(struct ntnode *ip)
117 {
118 	struct nthashhead *ipp;
119 	lwkt_tokref ilock;
120 
121 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
122 	ipp = NTNOHASH(ip->i_dev, ip->i_number);
123 	LIST_INSERT_HEAD(ipp, ip, i_hash);
124 	ip->i_flag |= IN_HASHED;
125 	lwkt_reltoken(&ilock);
126 }
127 
128 /*
129  * Remove the inode from the hash table.
130  */
131 void
132 ntfs_nthashrem(struct ntnode *ip)
133 {
134 	lwkt_tokref ilock;
135 
136 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
137 	if (ip->i_flag & IN_HASHED) {
138 		ip->i_flag &= ~IN_HASHED;
139 		LIST_REMOVE(ip, i_hash);
140 #ifdef DIAGNOSTIC
141 		ip->i_hash.le_next = NULL;
142 		ip->i_hash.le_prev = NULL;
143 #endif
144 	}
145 	lwkt_reltoken(&ilock);
146 }
147