1 /* $NetBSD: ntfs_ihash.c,v 1.2 2003/08/07 16:31:39 agc 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 1.2 2003/08/07 16:31:39 agc 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/malloc.h> 44 #include <sys/proc.h> 45 #include <sys/mount.h> 46 47 #include <fs/ntfs/ntfs.h> 48 #include <fs/ntfs/ntfs_inode.h> 49 #include <fs/ntfs/ntfs_ihash.h> 50 51 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); 52 53 /* 54 * Structures associated with inode cacheing. 55 */ 56 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; 57 static u_long ntfs_nthash; /* size of hash table - 1 */ 58 #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash) 59 #ifndef NULL_SIMPLELOCKS 60 static struct simplelock ntfs_nthash_slock; 61 #endif 62 struct lock ntfs_hashlock; 63 64 /* 65 * Initialize inode hash table. 66 */ 67 void 68 ntfs_nthashinit() 69 { 70 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0); 71 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, 72 &ntfs_nthash); 73 simple_lock_init(&ntfs_nthash_slock); 74 } 75 76 #ifdef __NetBSD__ 77 /* 78 * Reinitialize inode hash table. 79 */ 80 81 void 82 ntfs_nthashreinit() 83 { 84 struct ntnode *ip; 85 struct nthashhead *oldhash, *hash; 86 u_long oldmask, mask, val; 87 int i; 88 89 hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask); 90 91 simple_lock(&ntfs_nthash_slock); 92 oldhash = ntfs_nthashtbl; 93 oldmask = ntfs_nthash; 94 ntfs_nthashtbl = hash; 95 ntfs_nthash = mask; 96 for (i = 0; i <= oldmask; i++) { 97 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { 98 LIST_REMOVE(ip, i_hash); 99 val = NTNOHASH(ip->i_dev, ip->i_number); 100 LIST_INSERT_HEAD(&hash[val], ip, i_hash); 101 } 102 } 103 simple_unlock(&ntfs_nthash_slock); 104 hashdone(oldhash, M_NTFSNTHASH); 105 } 106 107 /* 108 * Free the inode hash table. Called from ntfs_done(), only needed 109 * on NetBSD. 110 */ 111 void 112 ntfs_nthashdone() 113 { 114 hashdone(ntfs_nthashtbl, M_NTFSNTHASH); 115 } 116 #endif 117 118 /* 119 * Use the device/inum pair to find the incore inode, and return a pointer 120 * to it. If it is in core, return it, even if it is locked. 121 */ 122 struct ntnode * 123 ntfs_nthashlookup(dev, inum) 124 dev_t dev; 125 ino_t inum; 126 { 127 struct ntnode *ip; 128 struct nthashhead *ipp; 129 130 simple_lock(&ntfs_nthash_slock); 131 ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)]; 132 LIST_FOREACH(ip, ipp, i_hash) { 133 if (inum == ip->i_number && dev == ip->i_dev) 134 break; 135 } 136 simple_unlock(&ntfs_nthash_slock); 137 138 return (ip); 139 } 140 141 /* 142 * Insert the ntnode into the hash table. 143 */ 144 void 145 ntfs_nthashins(ip) 146 struct ntnode *ip; 147 { 148 struct nthashhead *ipp; 149 150 simple_lock(&ntfs_nthash_slock); 151 ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)]; 152 LIST_INSERT_HEAD(ipp, ip, i_hash); 153 ip->i_flag |= IN_HASHED; 154 simple_unlock(&ntfs_nthash_slock); 155 } 156 157 /* 158 * Remove the inode from the hash table. 159 */ 160 void 161 ntfs_nthashrem(ip) 162 struct ntnode *ip; 163 { 164 simple_lock(&ntfs_nthash_slock); 165 if (ip->i_flag & IN_HASHED) { 166 ip->i_flag &= ~IN_HASHED; 167 LIST_REMOVE(ip, i_hash); 168 } 169 simple_unlock(&ntfs_nthash_slock); 170 } 171