172 lines
5.5 KiB
C
172 lines
5.5 KiB
C
/* $NetBSD: hfs_nhash.c,v 1.12 2011/06/12 03:35:53 rmind Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2005, 2007 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Yevgeny Binder.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: hfs_nhash.c,v 1.12 2011/06/12 03:35:53 rmind Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/time.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/dirent.h>
|
|
#include <sys/msgbuf.h>
|
|
|
|
#include <fs/hfs/hfs.h>
|
|
|
|
LIST_HEAD(nhashhead, hfsnode) *nhashtbl;
|
|
u_long nhash; /* size of hash table - 1 */
|
|
#define HNOHASH(device, cnid, fork) (((device) + (cnid) + (fork)) & nhash)
|
|
|
|
kmutex_t hfs_hashlock;
|
|
kmutex_t hfs_nhash_lock;
|
|
|
|
/*
|
|
* Initialize hfsnode hash table.
|
|
*/
|
|
void
|
|
hfs_nhashinit(void)
|
|
{
|
|
|
|
nhashtbl = hashinit(desiredvnodes, HASH_LIST, true, &nhash);
|
|
mutex_init(&hfs_nhash_lock, MUTEX_DEFAULT, IPL_NONE);
|
|
mutex_init(&hfs_hashlock, MUTEX_DEFAULT, IPL_NONE);
|
|
}
|
|
|
|
/*
|
|
* Free hfsnode hash table.
|
|
*/
|
|
void
|
|
hfs_nhashdone(void)
|
|
{
|
|
|
|
hashdone(nhashtbl, HASH_LIST, nhash);
|
|
mutex_destroy(&hfs_nhash_lock);
|
|
mutex_destroy(&hfs_hashlock);
|
|
}
|
|
|
|
/*
|
|
* Use the device/inum pair to find the incore inode, and return a pointer
|
|
* to it. If it is in core, but locked, wait for it.
|
|
*/
|
|
struct vnode *
|
|
hfs_nhashget(dev_t dev, hfs_cnid_t cnid, uint8_t fork, int flags)
|
|
{
|
|
struct hfsnode *hp;
|
|
struct nhashhead *hpp;
|
|
struct vnode *vp;
|
|
|
|
loop:
|
|
mutex_enter(&hfs_nhash_lock);
|
|
hpp = &nhashtbl[HNOHASH(dev, cnid, fork)];
|
|
LIST_FOREACH(hp, hpp, h_hash) {
|
|
if (cnid == hp->h_rec.u.cnid && dev == hp->h_dev) {
|
|
vp = HTOV(hp);
|
|
if (flags == 0) {
|
|
mutex_exit(&hfs_nhash_lock);
|
|
} else {
|
|
mutex_enter(vp->v_interlock);
|
|
mutex_exit(&hfs_nhash_lock);
|
|
if (vget(vp, flags))
|
|
goto loop;
|
|
}
|
|
return vp;
|
|
}
|
|
}
|
|
mutex_exit(&hfs_nhash_lock);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Insert the hfsnode into the hash table, and return it locked.
|
|
*/
|
|
void
|
|
hfs_nhashinsert(struct hfsnode *hp)
|
|
{
|
|
struct nhashhead *hpp;
|
|
|
|
/* lock the inode, then put it on the appropriate hash list */
|
|
VOP_LOCK(HTOV(hp), LK_EXCLUSIVE);
|
|
|
|
mutex_enter(&hfs_nhash_lock);
|
|
hpp = &nhashtbl[HNOHASH(hp->h_dev, hp->h_rec.u.cnid, hp->h_fork)];
|
|
LIST_INSERT_HEAD(hpp, hp, h_hash);
|
|
mutex_exit(&hfs_nhash_lock);
|
|
}
|
|
|
|
/*
|
|
* Remove the inode from the hash table.
|
|
*/
|
|
void
|
|
hfs_nhashremove(struct hfsnode *hp)
|
|
{
|
|
|
|
mutex_enter(&hfs_nhash_lock);
|
|
LIST_REMOVE(hp, h_hash);
|
|
mutex_exit(&hfs_nhash_lock);
|
|
}
|