mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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 8.4 (Berkeley) 12/30/93
|
|
* $Id: ufs_ihash.c,v 1.3 1994/10/06 21:07:01 davidg Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
|
|
/*
|
|
* Structures associated with inode cacheing.
|
|
*/
|
|
struct inode **ihashtbl;
|
|
u_long ihash; /* size of hash table - 1 */
|
|
#define INOHASH(device, inum) (((device) + (inum)) & ihash)
|
|
|
|
/*
|
|
* Initialize inode hash table.
|
|
*/
|
|
void
|
|
ufs_ihashinit()
|
|
{
|
|
|
|
ihashtbl = hashinit(desiredvnodes, M_UFSMNT, &ihash);
|
|
}
|
|
|
|
/*
|
|
* 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 *
|
|
ufs_ihashlookup(device, inum)
|
|
dev_t device;
|
|
ino_t inum;
|
|
{
|
|
register struct inode *ip;
|
|
|
|
for (ip = ihashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
|
|
if (ip == NULL)
|
|
return (NULL);
|
|
if (inum == ip->i_number && device == ip->i_dev)
|
|
return (ITOV(ip));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* 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 *
|
|
ufs_ihashget(device, inum)
|
|
dev_t device;
|
|
ino_t inum;
|
|
{
|
|
register struct inode *ip;
|
|
struct vnode *vp;
|
|
|
|
for (;;)
|
|
for (ip = ihashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
|
|
if (ip == NULL)
|
|
return (NULL);
|
|
if (inum == ip->i_number && device == ip->i_dev) {
|
|
if (ip->i_flag & IN_LOCKED) {
|
|
ip->i_flag |= IN_WANTED;
|
|
(void) tsleep(ip, PINOD, "uihget", 0);
|
|
break;
|
|
}
|
|
vp = ITOV(ip);
|
|
if (!vget(vp, 1))
|
|
return (vp);
|
|
break;
|
|
}
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Insert the inode into the hash table, and return it locked.
|
|
*/
|
|
void
|
|
ufs_ihashins(ip)
|
|
struct inode *ip;
|
|
{
|
|
struct inode **ipp, *iq;
|
|
|
|
ipp = &ihashtbl[INOHASH(ip->i_dev, ip->i_number)];
|
|
iq = *ipp;
|
|
if (iq)
|
|
iq->i_prev = &ip->i_next;
|
|
ip->i_next = iq;
|
|
ip->i_prev = ipp;
|
|
*ipp = ip;
|
|
if (ip->i_flag & IN_LOCKED)
|
|
panic("ufs_ihashins: already locked");
|
|
if (curproc)
|
|
ip->i_lockholder = curproc->p_pid;
|
|
else
|
|
ip->i_lockholder = -1;
|
|
ip->i_flag |= IN_LOCKED;
|
|
}
|
|
|
|
/*
|
|
* Remove the inode from the hash table.
|
|
*/
|
|
void
|
|
ufs_ihashrem(ip)
|
|
register struct inode *ip;
|
|
{
|
|
register struct inode *iq;
|
|
|
|
iq = ip->i_next;
|
|
if (iq)
|
|
iq->i_prev = ip->i_prev;
|
|
*ip->i_prev = iq;
|
|
#ifdef DIAGNOSTIC
|
|
ip->i_next = NULL;
|
|
ip->i_prev = NULL;
|
|
#endif
|
|
}
|