Annotation of sys/ntfs/ntfs_ihash.c, Revision 1.1.1.1
1.1 nbrk 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
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
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
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 *
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
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
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: }
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