ntfs_ihash.c revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: ntfs_ihash.c,v 1.1.2.2 2002/12/29 19:56:13 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /* 4 1.1.2.2 thorpej * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995 5 1.1.2.2 thorpej * The Regents of the University of California. All rights reserved. 6 1.1.2.2 thorpej * 7 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 9 1.1.2.2 thorpej * are met: 10 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 15 1.1.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 16 1.1.2.2 thorpej * must display the following acknowledgement: 17 1.1.2.2 thorpej * This product includes software developed by the University of 18 1.1.2.2 thorpej * California, Berkeley and its contributors. 19 1.1.2.2 thorpej * 4. Neither the name of the University nor the names of its contributors 20 1.1.2.2 thorpej * may be used to endorse or promote products derived from this software 21 1.1.2.2 thorpej * without specific prior written permission. 22 1.1.2.2 thorpej * 23 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1.2.2 thorpej * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1.2.2 thorpej * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1.2.2 thorpej * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1.2.2 thorpej * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1.2.2 thorpej * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1.2.2 thorpej * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1.2.2 thorpej * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1.2.2 thorpej * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1.2.2 thorpej * SUCH DAMAGE. 34 1.1.2.2 thorpej * 35 1.1.2.2 thorpej * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95 36 1.1.2.2 thorpej * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp 37 1.1.2.2 thorpej */ 38 1.1.2.2 thorpej 39 1.1.2.2 thorpej #include <sys/cdefs.h> 40 1.1.2.2 thorpej __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.1.2.2 2002/12/29 19:56:13 thorpej Exp $"); 41 1.1.2.2 thorpej 42 1.1.2.2 thorpej #include <sys/param.h> 43 1.1.2.2 thorpej #include <sys/systm.h> 44 1.1.2.2 thorpej #include <sys/kernel.h> 45 1.1.2.2 thorpej #include <sys/lock.h> 46 1.1.2.2 thorpej #include <sys/vnode.h> 47 1.1.2.2 thorpej #include <sys/malloc.h> 48 1.1.2.2 thorpej #include <sys/proc.h> 49 1.1.2.2 thorpej #include <sys/mount.h> 50 1.1.2.2 thorpej 51 1.1.2.2 thorpej #include <fs/ntfs/ntfs.h> 52 1.1.2.2 thorpej #include <fs/ntfs/ntfs_inode.h> 53 1.1.2.2 thorpej #include <fs/ntfs/ntfs_ihash.h> 54 1.1.2.2 thorpej 55 1.1.2.2 thorpej MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); 56 1.1.2.2 thorpej 57 1.1.2.2 thorpej /* 58 1.1.2.2 thorpej * Structures associated with inode cacheing. 59 1.1.2.2 thorpej */ 60 1.1.2.2 thorpej static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; 61 1.1.2.2 thorpej static u_long ntfs_nthash; /* size of hash table - 1 */ 62 1.1.2.2 thorpej #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash) 63 1.1.2.2 thorpej #ifndef NULL_SIMPLELOCKS 64 1.1.2.2 thorpej static struct simplelock ntfs_nthash_slock; 65 1.1.2.2 thorpej #endif 66 1.1.2.2 thorpej struct lock ntfs_hashlock; 67 1.1.2.2 thorpej 68 1.1.2.2 thorpej /* 69 1.1.2.2 thorpej * Initialize inode hash table. 70 1.1.2.2 thorpej */ 71 1.1.2.2 thorpej void 72 1.1.2.2 thorpej ntfs_nthashinit() 73 1.1.2.2 thorpej { 74 1.1.2.2 thorpej lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0); 75 1.1.2.2 thorpej ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, 76 1.1.2.2 thorpej &ntfs_nthash); 77 1.1.2.2 thorpej simple_lock_init(&ntfs_nthash_slock); 78 1.1.2.2 thorpej } 79 1.1.2.2 thorpej 80 1.1.2.2 thorpej #ifdef __NetBSD__ 81 1.1.2.2 thorpej /* 82 1.1.2.2 thorpej * Reinitialize inode hash table. 83 1.1.2.2 thorpej */ 84 1.1.2.2 thorpej 85 1.1.2.2 thorpej void 86 1.1.2.2 thorpej ntfs_nthashreinit() 87 1.1.2.2 thorpej { 88 1.1.2.2 thorpej struct ntnode *ip; 89 1.1.2.2 thorpej struct nthashhead *oldhash, *hash; 90 1.1.2.2 thorpej u_long oldmask, mask, val; 91 1.1.2.2 thorpej int i; 92 1.1.2.2 thorpej 93 1.1.2.2 thorpej hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask); 94 1.1.2.2 thorpej 95 1.1.2.2 thorpej simple_lock(&ntfs_nthash_slock); 96 1.1.2.2 thorpej oldhash = ntfs_nthashtbl; 97 1.1.2.2 thorpej oldmask = ntfs_nthash; 98 1.1.2.2 thorpej ntfs_nthashtbl = hash; 99 1.1.2.2 thorpej ntfs_nthash = mask; 100 1.1.2.2 thorpej for (i = 0; i <= oldmask; i++) { 101 1.1.2.2 thorpej while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { 102 1.1.2.2 thorpej LIST_REMOVE(ip, i_hash); 103 1.1.2.2 thorpej val = NTNOHASH(ip->i_dev, ip->i_number); 104 1.1.2.2 thorpej LIST_INSERT_HEAD(&hash[val], ip, i_hash); 105 1.1.2.2 thorpej } 106 1.1.2.2 thorpej } 107 1.1.2.2 thorpej simple_unlock(&ntfs_nthash_slock); 108 1.1.2.2 thorpej hashdone(oldhash, M_NTFSNTHASH); 109 1.1.2.2 thorpej } 110 1.1.2.2 thorpej 111 1.1.2.2 thorpej /* 112 1.1.2.2 thorpej * Free the inode hash table. Called from ntfs_done(), only needed 113 1.1.2.2 thorpej * on NetBSD. 114 1.1.2.2 thorpej */ 115 1.1.2.2 thorpej void 116 1.1.2.2 thorpej ntfs_nthashdone() 117 1.1.2.2 thorpej { 118 1.1.2.2 thorpej hashdone(ntfs_nthashtbl, M_NTFSNTHASH); 119 1.1.2.2 thorpej } 120 1.1.2.2 thorpej #endif 121 1.1.2.2 thorpej 122 1.1.2.2 thorpej /* 123 1.1.2.2 thorpej * Use the device/inum pair to find the incore inode, and return a pointer 124 1.1.2.2 thorpej * to it. If it is in core, return it, even if it is locked. 125 1.1.2.2 thorpej */ 126 1.1.2.2 thorpej struct ntnode * 127 1.1.2.2 thorpej ntfs_nthashlookup(dev, inum) 128 1.1.2.2 thorpej dev_t dev; 129 1.1.2.2 thorpej ino_t inum; 130 1.1.2.2 thorpej { 131 1.1.2.2 thorpej struct ntnode *ip; 132 1.1.2.2 thorpej struct nthashhead *ipp; 133 1.1.2.2 thorpej 134 1.1.2.2 thorpej simple_lock(&ntfs_nthash_slock); 135 1.1.2.2 thorpej ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)]; 136 1.1.2.2 thorpej LIST_FOREACH(ip, ipp, i_hash) { 137 1.1.2.2 thorpej if (inum == ip->i_number && dev == ip->i_dev) 138 1.1.2.2 thorpej break; 139 1.1.2.2 thorpej } 140 1.1.2.2 thorpej simple_unlock(&ntfs_nthash_slock); 141 1.1.2.2 thorpej 142 1.1.2.2 thorpej return (ip); 143 1.1.2.2 thorpej } 144 1.1.2.2 thorpej 145 1.1.2.2 thorpej /* 146 1.1.2.2 thorpej * Insert the ntnode into the hash table. 147 1.1.2.2 thorpej */ 148 1.1.2.2 thorpej void 149 1.1.2.2 thorpej ntfs_nthashins(ip) 150 1.1.2.2 thorpej struct ntnode *ip; 151 1.1.2.2 thorpej { 152 1.1.2.2 thorpej struct nthashhead *ipp; 153 1.1.2.2 thorpej 154 1.1.2.2 thorpej simple_lock(&ntfs_nthash_slock); 155 1.1.2.2 thorpej ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)]; 156 1.1.2.2 thorpej LIST_INSERT_HEAD(ipp, ip, i_hash); 157 1.1.2.2 thorpej ip->i_flag |= IN_HASHED; 158 1.1.2.2 thorpej simple_unlock(&ntfs_nthash_slock); 159 1.1.2.2 thorpej } 160 1.1.2.2 thorpej 161 1.1.2.2 thorpej /* 162 1.1.2.2 thorpej * Remove the inode from the hash table. 163 1.1.2.2 thorpej */ 164 1.1.2.2 thorpej void 165 1.1.2.2 thorpej ntfs_nthashrem(ip) 166 1.1.2.2 thorpej struct ntnode *ip; 167 1.1.2.2 thorpej { 168 1.1.2.2 thorpej simple_lock(&ntfs_nthash_slock); 169 1.1.2.2 thorpej if (ip->i_flag & IN_HASHED) { 170 1.1.2.2 thorpej ip->i_flag &= ~IN_HASHED; 171 1.1.2.2 thorpej LIST_REMOVE(ip, i_hash); 172 1.1.2.2 thorpej } 173 1.1.2.2 thorpej simple_unlock(&ntfs_nthash_slock); 174 1.1.2.2 thorpej } 175
Indexes created Tue Oct 07 21:09:53 GMT 2025