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. 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 * $FreeBSD: src/sys/ntfs/ntfs_ihash.c,v 1.7 1999/12/03 20:37:39 semenu Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/vnode.h> 40 #include <sys/malloc.h> 41 #include <sys/proc.h> 42 #include <sys/mount.h> 43 44 #include "ntfs.h" 45 #include "ntfs_inode.h" 46 #include "ntfs_ihash.h" 47 48 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); 49 50 /* 51 * Structures associated with inode cacheing. 52 */ 53 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; 54 static u_long ntfs_nthash; /* size of hash table - 1 */ 55 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash]) 56 static struct lwkt_token ntfs_nthash_slock; 57 struct lock ntfs_hashlock; 58 59 /* 60 * Initialize inode hash table. 61 */ 62 void 63 ntfs_nthashinit(void) 64 { 65 int hsize = vfs_inodehashsize(); 66 67 lockinit(&ntfs_hashlock, "ntfs_nthashlock", 0, 0); 68 ntfs_nthashtbl = hashinit(hsize, M_NTFSNTHASH, &ntfs_nthash); 69 lwkt_token_init(&ntfs_nthash_slock, "ntfsihash"); 70 } 71 72 /* 73 * Free the inode hash table. 74 */ 75 int 76 ntfs_nthash_uninit(struct vfsconf *vfc) 77 { 78 lwkt_gettoken(&ntfs_nthash_slock); 79 if (ntfs_nthashtbl) 80 hashdestroy(ntfs_nthashtbl, M_NTFSNTHASH, ntfs_nthash); 81 lwkt_reltoken(&ntfs_nthash_slock); 82 83 return 0; 84 } 85 86 /* 87 * Use the device/inum pair to find the incore inode, and return a pointer 88 * to it. If it is in core, return it, even if it is locked. 89 */ 90 struct ntnode * 91 ntfs_nthashlookup(cdev_t dev, ino_t inum) 92 { 93 struct ntnode *ip; 94 95 lwkt_gettoken(&ntfs_nthash_slock); 96 for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) { 97 if (inum == ip->i_number && dev == ip->i_dev) 98 break; 99 } 100 lwkt_reltoken(&ntfs_nthash_slock); 101 102 return (ip); 103 } 104 105 /* 106 * Insert the ntnode into the hash table. 107 */ 108 void 109 ntfs_nthashins(struct ntnode *ip) 110 { 111 struct nthashhead *ipp; 112 113 lwkt_gettoken(&ntfs_nthash_slock); 114 ipp = NTNOHASH(ip->i_dev, ip->i_number); 115 LIST_INSERT_HEAD(ipp, ip, i_hash); 116 ip->i_flag |= IN_HASHED; 117 lwkt_reltoken(&ntfs_nthash_slock); 118 } 119 120 /* 121 * Remove the inode from the hash table. 122 */ 123 void 124 ntfs_nthashrem(struct ntnode *ip) 125 { 126 lwkt_gettoken(&ntfs_nthash_slock); 127 if (ip->i_flag & IN_HASHED) { 128 ip->i_flag &= ~IN_HASHED; 129 LIST_REMOVE(ip, i_hash); 130 #ifdef DIAGNOSTIC 131 ip->i_hash.le_next = NULL; 132 ip->i_hash.le_prev = NULL; 133 #endif 134 } 135 lwkt_reltoken(&ntfs_nthash_slock); 136 } 137