minix/sys/ufs/lfs/ulfs_ihash.c
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

192 lines
5 KiB
C

/* $NetBSD: ulfs_ihash.c,v 1.3 2013/06/06 00:48:04 dholland Exp $ */
/* from NetBSD: ufs_ihash.c,v 1.31 2011/06/12 03:36:02 rmind Exp */
/*
* 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.
*
* @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ulfs_ihash.c,v 1.3 2013/06/06 00:48:04 dholland Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/mutex.h>
#include <ufs/lfs/ulfs_inode.h>
#include <ufs/lfs/ulfs_extern.h>
/*
* Structures associated with inode cacheing.
*/
static LIST_HEAD(ihashhead, inode) *ihashtbl;
static u_long ihash; /* size of hash table - 1 */
#define INOHASH(device, inum) (((device) + (inum)) & ihash)
kmutex_t ulfs_ihash_lock;
kmutex_t ulfs_hashlock;
/*
* Initialize inode hash table.
*/
void
ulfs_ihashinit(void)
{
mutex_init(&ulfs_hashlock, MUTEX_DEFAULT, IPL_NONE);
mutex_init(&ulfs_ihash_lock, MUTEX_DEFAULT, IPL_NONE);
ihashtbl = hashinit(desiredvnodes, HASH_LIST, true, &ihash);
}
/*
* Reinitialize inode hash table.
*/
void
ulfs_ihashreinit(void)
{
struct inode *ip;
struct ihashhead *oldhash, *hash;
u_long oldmask, mask, val;
int i;
hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
mutex_enter(&ulfs_ihash_lock);
oldhash = ihashtbl;
oldmask = ihash;
ihashtbl = hash;
ihash = mask;
for (i = 0; i <= oldmask; i++) {
while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
LIST_REMOVE(ip, i_hash);
val = INOHASH(ip->i_dev, ip->i_number);
LIST_INSERT_HEAD(&hash[val], ip, i_hash);
}
}
mutex_exit(&ulfs_ihash_lock);
hashdone(oldhash, HASH_LIST, oldmask);
}
/*
* Free inode hash table.
*/
void
ulfs_ihashdone(void)
{
hashdone(ihashtbl, HASH_LIST, ihash);
mutex_destroy(&ulfs_hashlock);
mutex_destroy(&ulfs_ihash_lock);
}
/*
* 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 vnode *
ulfs_ihashlookup(dev_t dev, ino_t inum)
{
struct inode *ip;
struct ihashhead *ipp;
KASSERT(mutex_owned(&ulfs_ihash_lock));
ipp = &ihashtbl[INOHASH(dev, inum)];
LIST_FOREACH(ip, ipp, i_hash) {
if (inum == ip->i_number && dev == ip->i_dev)
break;
}
if (ip)
return (ITOV(ip));
return (NULLVP);
}
/*
* 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 *
ulfs_ihashget(dev_t dev, ino_t inum, int flags)
{
struct ihashhead *ipp;
struct inode *ip;
struct vnode *vp;
loop:
mutex_enter(&ulfs_ihash_lock);
ipp = &ihashtbl[INOHASH(dev, inum)];
LIST_FOREACH(ip, ipp, i_hash) {
if (inum == ip->i_number && dev == ip->i_dev) {
vp = ITOV(ip);
if (flags == 0) {
mutex_exit(&ulfs_ihash_lock);
} else {
mutex_enter(vp->v_interlock);
mutex_exit(&ulfs_ihash_lock);
if (vget(vp, flags))
goto loop;
}
return (vp);
}
}
mutex_exit(&ulfs_ihash_lock);
return (NULL);
}
/*
* Insert the inode into the hash table, and return it locked.
*/
void
ulfs_ihashins(struct inode *ip)
{
struct ihashhead *ipp;
KASSERT(mutex_owned(&ulfs_hashlock));
/* lock the inode, then put it on the appropriate hash list */
VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
mutex_enter(&ulfs_ihash_lock);
ipp = &ihashtbl[INOHASH(ip->i_dev, ip->i_number)];
LIST_INSERT_HEAD(ipp, ip, i_hash);
mutex_exit(&ulfs_ihash_lock);
}
/*
* Remove the inode from the hash table.
*/
void
ulfs_ihashrem(struct inode *ip)
{
mutex_enter(&ulfs_ihash_lock);
LIST_REMOVE(ip, i_hash);
mutex_exit(&ulfs_ihash_lock);
}