1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* $OpenBSD: ntfs_ihash.c,v 1.5 2009/03/25 20:39:47 oga Exp $ */
/* $NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
* Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/mount.h>
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <fs/ntfs/ntfs.h>
#include <fs/ntfs/ntfs_inode.h>
#include <fs/ntfs/ntfs_ihash.h>
#else
#include <ntfs/ntfs.h>
#include <ntfs/ntfs_inode.h>
#include <ntfs/ntfs_ihash.h>
#endif
#ifdef MALLOC_DEFINE
MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
#endif
/*
* Structures associated with inode cacheing.
*/
static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
static u_long ntfs_nthash; /* size of hash table - 1 */
#define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash)
#ifndef NULL_SIMPLELOCKS
static struct simplelock ntfs_nthash_slock;
#endif
struct rwlock ntfs_hashlock = RWLOCK_INITIALIZER("ntfs_nthashlock");
/*
* Initialize inode hash table.
*/
void
ntfs_nthashinit()
{
ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
&ntfs_nthash);
simple_lock_init(&ntfs_nthash_slock);
}
#ifdef __NetBSD__
/*
* Reinitialize inode hash table.
*/
void
ntfs_nthashreinit()
{
struct ntnode *ip;
struct nthashhead *oldhash, *hash;
u_long oldmask, mask, val;
int i;
hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask);
simple_lock(&ntfs_nthash_slock);
oldhash = ntfs_nthashtbl;
oldmask = ntfs_nthash;
ntfs_nthashtbl = hash;
ntfs_nthash = mask;
for (i = 0; i <= oldmask; i++) {
while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
LIST_REMOVE(ip, i_hash);
val = NTNOHASH(ip->i_dev, ip->i_number);
LIST_INSERT_HEAD(&hash[val], ip, i_hash);
}
}
simple_unlock(&ntfs_nthash_slock);
hashdone(oldhash, M_NTFSNTHASH);
}
/*
* Free the inode hash table. Called from ntfs_done(), only needed
* on NetBSD.
*/
void
ntfs_nthashdone()
{
hashdone(ntfs_nthashtbl, M_NTFSNTHASH);
}
#endif
/*
* Use the device/inum pair to find the incore inode, and return a pointer
* to it. If it is in core, return it, even if it is locked.
*/
struct ntnode *
ntfs_nthashlookup(dev, inum)
dev_t dev;
ino_t inum;
{
struct ntnode *ip;
struct nthashhead *ipp;
simple_lock(&ntfs_nthash_slock);
ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
LIST_FOREACH(ip, ipp, i_hash) {
if (inum == ip->i_number && dev == ip->i_dev)
break;
}
simple_unlock(&ntfs_nthash_slock);
return (ip);
}
/*
* Insert the ntnode into the hash table.
*/
void
ntfs_nthashins(ip)
struct ntnode *ip;
{
struct nthashhead *ipp;
simple_lock(&ntfs_nthash_slock);
ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
LIST_INSERT_HEAD(ipp, ip, i_hash);
ip->i_flag |= IN_HASHED;
simple_unlock(&ntfs_nthash_slock);
}
/*
* Remove the inode from the hash table.
*/
void
ntfs_nthashrem(ip)
struct ntnode *ip;
{
simple_lock(&ntfs_nthash_slock);
if (ip->i_flag & IN_HASHED) {
ip->i_flag &= ~IN_HASHED;
LIST_REMOVE(ip, i_hash);
}
simple_unlock(&ntfs_nthash_slock);
}
|
