File:  [DragonFly] / src / sys / vfs / ntfs / ntfs_ihash.c
Revision 1.9: download - view: text, annotated - select for diffs
Tue Apr 20 19:59:30 2004 UTC (10 years, 5 months ago) by cpressey
Branches: MAIN
CVS tags: HEAD, DragonFly_Stable, DragonFly_Snap29Sep2004, DragonFly_Snap13Sep2004, DragonFly_RELEASE_1_4_Slip, DragonFly_RELEASE_1_4, DragonFly_RELEASE_1_2_Slip, DragonFly_RELEASE_1_2, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
Style(9) cleanup to src/sys/vfs, stage 11/21: ntfs.

- Convert K&R-style function definitions to ANSI style.

Submitted-by: Andre Nathan <andre@digirati.com.br>
Additional-reformatting-by: cpressey

    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 1.9 2004/04/20 19:59:30 cpressey 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, 0, "ntfs_nthashlock", 0, 0);
   71: 	ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
   72: 	    &ntfs_nthash);
   73: 	lwkt_token_init(&ntfs_nthash_slock);
   74: }
   75: 
   76: /*
   77:  * Free the inode hash table.
   78:  */
   79: int
   80: ntfs_nthash_uninit(struct vfsconf *vfc)
   81: {
   82: 	lwkt_tokref ilock;
   83: 
   84: 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
   85: 	if (ntfs_nthashtbl)
   86: 		free(ntfs_nthashtbl, M_NTFSNTHASH);
   87: 	lwkt_reltoken(&ilock);
   88: 
   89: 	return 0;
   90: }
   91: 
   92: /*
   93:  * Use the device/inum pair to find the incore inode, and return a pointer
   94:  * to it. If it is in core, return it, even if it is locked.
   95:  */
   96: struct ntnode *
   97: ntfs_nthashlookup(dev_t dev, ino_t inum)
   98: {
   99: 	struct ntnode *ip;
  100: 	lwkt_tokref ilock;
  101: 
  102: 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
  103: 	for (ip = NTNOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
  104: 		if (inum == ip->i_number && dev == ip->i_dev)
  105: 			break;
  106: 	}
  107: 	lwkt_reltoken(&ilock);
  108: 
  109: 	return (ip);
  110: }
  111: 
  112: /*
  113:  * Insert the ntnode into the hash table.
  114:  */
  115: void
  116: ntfs_nthashins(struct ntnode *ip)
  117: {
  118: 	struct nthashhead *ipp;
  119: 	lwkt_tokref ilock;
  120: 
  121: 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
  122: 	ipp = NTNOHASH(ip->i_dev, ip->i_number);
  123: 	LIST_INSERT_HEAD(ipp, ip, i_hash);
  124: 	ip->i_flag |= IN_HASHED;
  125: 	lwkt_reltoken(&ilock);
  126: }
  127: 
  128: /*
  129:  * Remove the inode from the hash table.
  130:  */
  131: void
  132: ntfs_nthashrem(struct ntnode *ip)
  133: {
  134: 	lwkt_tokref ilock;
  135: 
  136: 	lwkt_gettoken(&ilock, &ntfs_nthash_slock);
  137: 	if (ip->i_flag & IN_HASHED) {
  138: 		ip->i_flag &= ~IN_HASHED;
  139: 		LIST_REMOVE(ip, i_hash);
  140: #ifdef DIAGNOSTIC
  141: 		ip->i_hash.le_next = NULL;
  142: 		ip->i_hash.le_prev = NULL;
  143: #endif
  144: 	}
  145: 	lwkt_reltoken(&ilock);
  146: }