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 } 182