ntfs_ihash.c revision 1.1.2.2
1 /* $NetBSD: ntfs_ihash.c,v 1.1.2.2 2002/12/29 19:56:13 thorpej 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 * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.1.2.2 2002/12/29 19:56:13 thorpej Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/vnode.h> 47 #include <sys/malloc.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 51 #include <fs/ntfs/ntfs.h> 52 #include <fs/ntfs/ntfs_inode.h> 53 #include <fs/ntfs/ntfs_ihash.h> 54 55 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); 56 57 /* 58 * Structures associated with inode cacheing. 59 */ 60 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; 61 static u_long ntfs_nthash; /* size of hash table - 1 */ 62 #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash) 63 #ifndef NULL_SIMPLELOCKS 64 static struct simplelock ntfs_nthash_slock; 65 #endif 66 struct lock ntfs_hashlock; 67 68 /* 69 * Initialize inode hash table. 70 */ 71 void 72 ntfs_nthashinit() 73 { 74 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0); 75 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, 76 &ntfs_nthash); 77 simple_lock_init(&ntfs_nthash_slock); 78 } 79 80 #ifdef __NetBSD__ 81 /* 82 * Reinitialize inode hash table. 83 */ 84 85 void 86 ntfs_nthashreinit() 87 { 88 struct ntnode *ip; 89 struct nthashhead *oldhash, *hash; 90 u_long oldmask, mask, val; 91 int i; 92 93 hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask); 94 95 simple_lock(&ntfs_nthash_slock); 96 oldhash = ntfs_nthashtbl; 97 oldmask = ntfs_nthash; 98 ntfs_nthashtbl = hash; 99 ntfs_nthash = mask; 100 for (i = 0; i <= oldmask; i++) { 101 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { 102 LIST_REMOVE(ip, i_hash); 103 val = NTNOHASH(ip->i_dev, ip->i_number); 104 LIST_INSERT_HEAD(&hash[val], ip, i_hash); 105 } 106 } 107 simple_unlock(&ntfs_nthash_slock); 108 hashdone(oldhash, M_NTFSNTHASH); 109 } 110 111 /* 112 * Free the inode hash table. Called from ntfs_done(), only needed 113 * on NetBSD. 114 */ 115 void 116 ntfs_nthashdone() 117 { 118 hashdone(ntfs_nthashtbl, M_NTFSNTHASH); 119 } 120 #endif 121 122 /* 123 * Use the device/inum pair to find the incore inode, and return a pointer 124 * to it. If it is in core, return it, even if it is locked. 125 */ 126 struct ntnode * 127 ntfs_nthashlookup(dev, inum) 128 dev_t dev; 129 ino_t inum; 130 { 131 struct ntnode *ip; 132 struct nthashhead *ipp; 133 134 simple_lock(&ntfs_nthash_slock); 135 ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)]; 136 LIST_FOREACH(ip, ipp, i_hash) { 137 if (inum == ip->i_number && dev == ip->i_dev) 138 break; 139 } 140 simple_unlock(&ntfs_nthash_slock); 141 142 return (ip); 143 } 144 145 /* 146 * Insert the ntnode into the hash table. 147 */ 148 void 149 ntfs_nthashins(ip) 150 struct ntnode *ip; 151 { 152 struct nthashhead *ipp; 153 154 simple_lock(&ntfs_nthash_slock); 155 ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)]; 156 LIST_INSERT_HEAD(ipp, ip, i_hash); 157 ip->i_flag |= IN_HASHED; 158 simple_unlock(&ntfs_nthash_slock); 159 } 160 161 /* 162 * Remove the inode from the hash table. 163 */ 164 void 165 ntfs_nthashrem(ip) 166 struct ntnode *ip; 167 { 168 simple_lock(&ntfs_nthash_slock); 169 if (ip->i_flag & IN_HASHED) { 170 ip->i_flag &= ~IN_HASHED; 171 LIST_REMOVE(ip, i_hash); 172 } 173 simple_unlock(&ntfs_nthash_slock); 174 } 175
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