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