/* $OpenBSD: ntfs_ihash.c,v 1.3 2003/06/02 23:28:20 millert Exp $ */ /* $NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $ */ /* * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95 * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp */ #include <sys/cdefs.h> #ifdef __KERNEL_RCSID __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $"); #endif #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/vnode.h> #include <sys/malloc.h> #include <sys/proc.h> #include <sys/mount.h> #if defined(__FreeBSD__) || defined(__NetBSD__) #include <fs/ntfs/ntfs.h> #include <fs/ntfs/ntfs_inode.h> #include <fs/ntfs/ntfs_ihash.h> #else #include <ntfs/ntfs.h> #include <ntfs/ntfs_inode.h> #include <ntfs/ntfs_ihash.h> #endif #ifdef MALLOC_DEFINE MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables"); #endif /* * Structures associated with inode cacheing. */ static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl; static u_long ntfs_nthash; /* size of hash table - 1 */ #define NTNOHASH(device, inum) ((minor(device) + (inum)) & ntfs_nthash) #ifndef NULL_SIMPLELOCKS static struct simplelock ntfs_nthash_slock; #endif struct lock ntfs_hashlock; /* * Initialize inode hash table. */ void ntfs_nthashinit() { lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0); ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &ntfs_nthash); simple_lock_init(&ntfs_nthash_slock); } #ifdef __NetBSD__ /* * Reinitialize inode hash table. */ void ntfs_nthashreinit() { struct ntnode *ip; struct nthashhead *oldhash, *hash; u_long oldmask, mask, val; int i; hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask); simple_lock(&ntfs_nthash_slock); oldhash = ntfs_nthashtbl; oldmask = ntfs_nthash; ntfs_nthashtbl = hash; ntfs_nthash = mask; for (i = 0; i <= oldmask; i++) { while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { LIST_REMOVE(ip, i_hash); val = NTNOHASH(ip->i_dev, ip->i_number); LIST_INSERT_HEAD(&hash[val], ip, i_hash); } } simple_unlock(&ntfs_nthash_slock); hashdone(oldhash, M_NTFSNTHASH); } /* * Free the inode hash table. Called from ntfs_done(), only needed * on NetBSD. */ void ntfs_nthashdone() { hashdone(ntfs_nthashtbl, M_NTFSNTHASH); } #endif /* * Use the device/inum pair to find the incore inode, and return a pointer * to it. If it is in core, return it, even if it is locked. */ struct ntnode * ntfs_nthashlookup(dev, inum) dev_t dev; ino_t inum; { struct ntnode *ip; struct nthashhead *ipp; simple_lock(&ntfs_nthash_slock); ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)]; LIST_FOREACH(ip, ipp, i_hash) { if (inum == ip->i_number && dev == ip->i_dev) break; } simple_unlock(&ntfs_nthash_slock); return (ip); } /* * Insert the ntnode into the hash table. */ void ntfs_nthashins(ip) struct ntnode *ip; { struct nthashhead *ipp; simple_lock(&ntfs_nthash_slock); ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)]; LIST_INSERT_HEAD(ipp, ip, i_hash); ip->i_flag |= IN_HASHED; simple_unlock(&ntfs_nthash_slock); } /* * Remove the inode from the hash table. */ void ntfs_nthashrem(ip) struct ntnode *ip; { simple_lock(&ntfs_nthash_slock); if (ip->i_flag & IN_HASHED) { ip->i_flag &= ~IN_HASHED; LIST_REMOVE(ip, i_hash); } simple_unlock(&ntfs_nthash_slock); }