Annotation of sys/ntfs/ntfs_ihash.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ntfs_ihash.c,v 1.3 2003/06/02 23:28:20 millert Exp $ */
! 2: /* $NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
! 33: * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
! 34: */
! 35:
! 36: #include <sys/cdefs.h>
! 37: #ifdef __KERNEL_RCSID
! 38: __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $");
! 39: #endif
! 40:
! 41: #include <sys/param.h>
! 42: #include <sys/systm.h>
! 43: #include <sys/kernel.h>
! 44: #include <sys/lock.h>
! 45: #include <sys/vnode.h>
! 46: #include <sys/malloc.h>
! 47: #include <sys/proc.h>
! 48: #include <sys/mount.h>
! 49:
! 50: #if defined(__FreeBSD__) || defined(__NetBSD__)
! 51: #include <fs/ntfs/ntfs.h>
! 52: #include <fs/ntfs/ntfs_inode.h>
! 53: #include <fs/ntfs/ntfs_ihash.h>
! 54: #else
! 55: #include <ntfs/ntfs.h>
! 56: #include <ntfs/ntfs_inode.h>
! 57: #include <ntfs/ntfs_ihash.h>
! 58: #endif
! 59:
! 60: #ifdef MALLOC_DEFINE
! 61: MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
! 62: #endif
! 63:
! 64: /*
! 65: * Structures associated with inode cacheing.
! 66: */
! 67: static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
! 68: static u_long ntfs_nthash; /* size of hash table - 1 */
! 69: #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash)
! 70: #ifndef NULL_SIMPLELOCKS
! 71: static struct simplelock ntfs_nthash_slock;
! 72: #endif
! 73: struct lock ntfs_hashlock;
! 74:
! 75: /*
! 76: * Initialize inode hash table.
! 77: */
! 78: void
! 79: ntfs_nthashinit()
! 80: {
! 81: lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
! 82: ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
! 83: &ntfs_nthash);
! 84: simple_lock_init(&ntfs_nthash_slock);
! 85: }
! 86:
! 87: #ifdef __NetBSD__
! 88: /*
! 89: * Reinitialize inode hash table.
! 90: */
! 91:
! 92: void
! 93: ntfs_nthashreinit()
! 94: {
! 95: struct ntnode *ip;
! 96: struct nthashhead *oldhash, *hash;
! 97: u_long oldmask, mask, val;
! 98: int i;
! 99:
! 100: hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask);
! 101:
! 102: simple_lock(&ntfs_nthash_slock);
! 103: oldhash = ntfs_nthashtbl;
! 104: oldmask = ntfs_nthash;
! 105: ntfs_nthashtbl = hash;
! 106: ntfs_nthash = mask;
! 107: for (i = 0; i <= oldmask; i++) {
! 108: while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
! 109: LIST_REMOVE(ip, i_hash);
! 110: val = NTNOHASH(ip->i_dev, ip->i_number);
! 111: LIST_INSERT_HEAD(&hash[val], ip, i_hash);
! 112: }
! 113: }
! 114: simple_unlock(&ntfs_nthash_slock);
! 115: hashdone(oldhash, M_NTFSNTHASH);
! 116: }
! 117:
! 118: /*
! 119: * Free the inode hash table. Called from ntfs_done(), only needed
! 120: * on NetBSD.
! 121: */
! 122: void
! 123: ntfs_nthashdone()
! 124: {
! 125: hashdone(ntfs_nthashtbl, M_NTFSNTHASH);
! 126: }
! 127: #endif
! 128:
! 129: /*
! 130: * Use the device/inum pair to find the incore inode, and return a pointer
! 131: * to it. If it is in core, return it, even if it is locked.
! 132: */
! 133: struct ntnode *
! 134: ntfs_nthashlookup(dev, inum)
! 135: dev_t dev;
! 136: ino_t inum;
! 137: {
! 138: struct ntnode *ip;
! 139: struct nthashhead *ipp;
! 140:
! 141: simple_lock(&ntfs_nthash_slock);
! 142: ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
! 143: LIST_FOREACH(ip, ipp, i_hash) {
! 144: if (inum == ip->i_number && dev == ip->i_dev)
! 145: break;
! 146: }
! 147: simple_unlock(&ntfs_nthash_slock);
! 148:
! 149: return (ip);
! 150: }
! 151:
! 152: /*
! 153: * Insert the ntnode into the hash table.
! 154: */
! 155: void
! 156: ntfs_nthashins(ip)
! 157: struct ntnode *ip;
! 158: {
! 159: struct nthashhead *ipp;
! 160:
! 161: simple_lock(&ntfs_nthash_slock);
! 162: ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
! 163: LIST_INSERT_HEAD(ipp, ip, i_hash);
! 164: ip->i_flag |= IN_HASHED;
! 165: simple_unlock(&ntfs_nthash_slock);
! 166: }
! 167:
! 168: /*
! 169: * Remove the inode from the hash table.
! 170: */
! 171: void
! 172: ntfs_nthashrem(ip)
! 173: struct ntnode *ip;
! 174: {
! 175: simple_lock(&ntfs_nthash_slock);
! 176: if (ip->i_flag & IN_HASHED) {
! 177: ip->i_flag &= ~IN_HASHED;
! 178: LIST_REMOVE(ip, i_hash);
! 179: }
! 180: simple_unlock(&ntfs_nthash_slock);
! 181: }
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