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 1.12 2006/09/10 01:26:41 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.h" 50 #include "ntfs_inode.h" 51 #include "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 static struct lwkt_token ntfs_nthash_slock; 62 struct lock ntfs_hashlock; 63 64 /* 65 * Initialize inode hash table. 66 */ 67 void 68 ntfs_nthashinit(void) 69 { 70 lockinit(&ntfs_hashlock, "ntfs_nthashlock", 0, 0); 71 ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, 72 &ntfs_nthash); 73 lwkt_token_init(&ntfs_nthash_slock, 1, "ntfsihash"); 74 } 75 76 /* 77 * Free the inode hash table. 78 */ 79 int 80 ntfs_nthash_uninit(struct vfsconf *vfc) 81 { 82 lwkt_gettoken(&ntfs_nthash_slock); 83 if (ntfs_nthashtbl) 84 kfree(ntfs_nthashtbl, M_NTFSNTHASH); 85 lwkt_reltoken(&ntfs_nthash_slock); 86 87 return 0; 88 } 89 90 /* 91 * Use the device/inum pair to find the incore inode, and return a pointer 92 * to it. If it is in core, return it, even if it is locked. 93 */ 94 struct ntnode * 95 ntfs_nthashlookup(cdev_t dev, ino_t inum) 96 { 97 struct ntnode *ip; 98 99 lwkt_gettoken(&ntfs_nthash_slock); 100 for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) { 101 if (inum == ip->i_number && dev == ip->i_dev) 102 break; 103 } 104 lwkt_reltoken(&ntfs_nthash_slock); 105 106 return (ip); 107 } 108 109 /* 110 * Insert the ntnode into the hash table. 111 */ 112 void 113 ntfs_nthashins(struct ntnode *ip) 114 { 115 struct nthashhead *ipp; 116 117 lwkt_gettoken(&ntfs_nthash_slock); 118 ipp = NTNOHASH(ip->i_dev, ip->i_number); 119 LIST_INSERT_HEAD(ipp, ip, i_hash); 120 ip->i_flag |= IN_HASHED; 121 lwkt_reltoken(&ntfs_nthash_slock); 122 } 123 124 /* 125 * Remove the inode from the hash table. 126 */ 127 void 128 ntfs_nthashrem(struct ntnode *ip) 129 { 130 lwkt_gettoken(&ntfs_nthash_slock); 131 if (ip->i_flag & IN_HASHED) { 132 ip->i_flag &= ~IN_HASHED; 133 LIST_REMOVE(ip, i_hash); 134 #ifdef DIAGNOSTIC 135 ip->i_hash.le_next = NULL; 136 ip->i_hash.le_prev = NULL; 137 #endif 138 } 139 lwkt_reltoken(&ntfs_nthash_slock); 140 } 141