1 /* $NetBSD: ntfs_ihash.c,v 1.5 1999/09/30 16:56:40 jdolecek 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 * $FreeBSD: src/sys/ntfs/ntfs_ihash.c,v 1.7 1999/12/03 20:37:39 semenu Exp $ 37 * $DragonFly: src/sys/vfs/ntfs/ntfs_ihash.c,v 1.2 2003/06/17 04:28:54 dillon Exp $ 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/vnode.h> 45 #include <sys/malloc.h> 46 #include <sys/proc.h> 47 #include <sys/mount.h> 48 49 #include <ntfs/ntfs.h> 50 #include <ntfs/ntfs_inode.h> 51 #include <ntfs/ntfs_ihash.h> 52 53 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); 54 55 /* 56 * Structures associated with inode cacheing. 57 */ 58 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; 59 static u_long ntfs_nthash; /* size of hash table - 1 */ 60 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash]) 61 #ifndef NULL_SIMPLELOCKS 62 static struct simplelock ntfs_nthash_slock; 63 #endif 64 struct lock ntfs_hashlock; 65 66 /* 67 * Initialize inode hash table. 68 */ 69 void 70 ntfs_nthashinit() 71 { 72 lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0); 73 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, 74 &ntfs_nthash); 75 simple_lock_init(&ntfs_nthash_slock); 76 } 77 78 /* 79 * Use the device/inum pair to find the incore inode, and return a pointer 80 * to it. If it is in core, return it, even if it is locked. 81 */ 82 struct ntnode * 83 ntfs_nthashlookup(dev, inum) 84 dev_t dev; 85 ino_t inum; 86 { 87 struct ntnode *ip; 88 89 simple_lock(&ntfs_nthash_slock); 90 for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) 91 if (inum == ip->i_number && dev == ip->i_dev) 92 break; 93 simple_unlock(&ntfs_nthash_slock); 94 95 return (ip); 96 } 97 98 /* 99 * Insert the ntnode into the hash table. 100 */ 101 void 102 ntfs_nthashins(ip) 103 struct ntnode *ip; 104 { 105 struct nthashhead *ipp; 106 107 simple_lock(&ntfs_nthash_slock); 108 ipp = NTNOHASH(ip->i_dev, ip->i_number); 109 LIST_INSERT_HEAD(ipp, ip, i_hash); 110 ip->i_flag |= IN_HASHED; 111 simple_unlock(&ntfs_nthash_slock); 112 } 113 114 /* 115 * Remove the inode from the hash table. 116 */ 117 void 118 ntfs_nthashrem(ip) 119 struct ntnode *ip; 120 { 121 simple_lock(&ntfs_nthash_slock); 122 if (ip->i_flag & IN_HASHED) { 123 ip->i_flag &= ~IN_HASHED; 124 LIST_REMOVE(ip, i_hash); 125 #ifdef DIAGNOSTIC 126 ip->i_hash.le_next = NULL; 127 ip->i_hash.le_prev = NULL; 128 #endif 129 } 130 simple_unlock(&ntfs_nthash_slock); 131 } 132