1 | /* $NetBSD: ntfs_ihash.c,v 1.11 2015/02/20 17:08:13 maxv 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 1.11 2015/02/20 17:08:13 maxv 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/mount.h> |
44 | #include <sys/mallocvar.h> |
45 | |
46 | #include <fs/ntfs/ntfs.h> |
47 | #include <fs/ntfs/ntfs_inode.h> |
48 | #include <fs/ntfs/ntfs_ihash.h> |
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) ((minor(device) + (inum)) & ntfs_nthash) |
56 | static kmutex_t ntfs_nthash_lock; |
57 | kmutex_t ntfs_hashlock; |
58 | |
59 | /* |
60 | * Initialize inode hash table. |
61 | */ |
62 | void |
63 | ntfs_nthashinit(void) |
64 | { |
65 | mutex_init(&ntfs_hashlock, MUTEX_DEFAULT, IPL_NONE); |
66 | mutex_init(&ntfs_nthash_lock, MUTEX_DEFAULT, IPL_NONE); |
67 | ntfs_nthashtbl = hashinit(desiredvnodes, HASH_LIST, true, &ntfs_nthash); |
68 | } |
69 | |
70 | /* |
71 | * Reinitialize inode hash table. |
72 | */ |
73 | |
74 | void |
75 | ntfs_nthashreinit(void) |
76 | { |
77 | struct ntnode *ip; |
78 | struct nthashhead *oldhash, *hash; |
79 | u_long oldmask, mask, val; |
80 | int i; |
81 | |
82 | hash = hashinit(desiredvnodes, HASH_LIST, true, &mask); |
83 | |
84 | mutex_enter(&ntfs_nthash_lock); |
85 | oldhash = ntfs_nthashtbl; |
86 | oldmask = ntfs_nthash; |
87 | ntfs_nthashtbl = hash; |
88 | ntfs_nthash = mask; |
89 | for (i = 0; i <= oldmask; i++) { |
90 | while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { |
91 | LIST_REMOVE(ip, i_hash); |
92 | val = NTNOHASH(ip->i_dev, ip->i_number); |
93 | LIST_INSERT_HEAD(&hash[val], ip, i_hash); |
94 | } |
95 | } |
96 | mutex_exit(&ntfs_nthash_lock); |
97 | hashdone(oldhash, HASH_LIST, oldmask); |
98 | } |
99 | |
100 | /* |
101 | * Free the inode hash table. Called from ntfs_done(), only needed |
102 | * on NetBSD. |
103 | */ |
104 | void |
105 | ntfs_nthashdone(void) |
106 | { |
107 | hashdone(ntfs_nthashtbl, HASH_LIST, ntfs_nthash); |
108 | mutex_destroy(&ntfs_hashlock); |
109 | mutex_destroy(&ntfs_nthash_lock); |
110 | } |
111 | |
112 | /* |
113 | * Use the device/inum pair to find the incore inode, and return a pointer |
114 | * to it. If it is in core, return it, even if it is locked. |
115 | */ |
116 | struct ntnode * |
117 | ntfs_nthashlookup(dev_t dev, ino_t inum) |
118 | { |
119 | struct ntnode *ip; |
120 | struct nthashhead *ipp; |
121 | |
122 | mutex_enter(&ntfs_nthash_lock); |
123 | ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)]; |
124 | LIST_FOREACH(ip, ipp, i_hash) { |
125 | if (inum == ip->i_number && dev == ip->i_dev) |
126 | break; |
127 | } |
128 | mutex_exit(&ntfs_nthash_lock); |
129 | |
130 | return (ip); |
131 | } |
132 | |
133 | /* |
134 | * Insert the ntnode into the hash table. |
135 | */ |
136 | void |
137 | ntfs_nthashins(struct ntnode *ip) |
138 | { |
139 | struct nthashhead *ipp; |
140 | |
141 | mutex_enter(&ntfs_nthash_lock); |
142 | ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)]; |
143 | LIST_INSERT_HEAD(ipp, ip, i_hash); |
144 | ip->i_flag |= IN_HASHED; |
145 | mutex_exit(&ntfs_nthash_lock); |
146 | } |
147 | |
148 | /* |
149 | * Remove the inode from the hash table. |
150 | */ |
151 | void |
152 | ntfs_nthashrem(struct ntnode *ip) |
153 | { |
154 | mutex_enter(&ntfs_nthash_lock); |
155 | if (ip->i_flag & IN_HASHED) { |
156 | ip->i_flag &= ~IN_HASHED; |
157 | LIST_REMOVE(ip, i_hash); |
158 | } |
159 | mutex_exit(&ntfs_nthash_lock); |
160 | } |
161 | |