277 lines
8.0 KiB
C
277 lines
8.0 KiB
C
/* $NetBSD: filecore_node.c,v 1.2 2003/08/07 16:31:37 agc Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1989, 1994
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* The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* filecore_node.c 1.0 1998/6/4
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*/
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/*-
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* Copyright (c) 1998 Andrew McMurry
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* filecore_node.c 1.0 1998/6/4
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: filecore_node.c,v 1.2 2003/08/07 16:31:37 agc Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/pool.h>
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#include <sys/stat.h>
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#include <fs/filecorefs/filecore.h>
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#include <fs/filecorefs/filecore_extern.h>
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#include <fs/filecorefs/filecore_node.h>
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#include <fs/filecorefs/filecore_mount.h>
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/*
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* Structures associated with filecore_node caching.
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*/
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LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl;
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u_long filecorehash;
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#define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash)
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struct simplelock filecore_ihash_slock;
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struct pool filecore_node_pool;
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extern int prtactive; /* 1 => print out reclaim of active vnodes */
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/*
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* Initialize hash links for inodes and dnodes.
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*/
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void
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filecore_init()
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{
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filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT,
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M_WAITOK, &filecorehash);
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simple_lock_init(&filecore_ihash_slock);
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pool_init(&filecore_node_pool, sizeof(struct filecore_node),
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0, 0, 0, "filecrnopl", &pool_allocator_nointr);
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}
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/*
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* Reinitialize inode hash table.
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*/
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void
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filecore_reinit()
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{
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struct filecore_node *ip;
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struct ihashhead *oldhash, *hash;
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u_long oldmask, mask, val;
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int i;
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hash = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT, M_WAITOK,
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&mask);
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simple_lock(&filecore_ihash_slock);
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oldhash = filecorehashtbl;
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oldmask = filecorehash;
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filecorehashtbl = hash;
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filecorehash = mask;
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for (i = 0; i <= oldmask; i++) {
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while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
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LIST_REMOVE(ip, i_hash);
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val = INOHASH(ip->i_dev, ip->i_number);
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LIST_INSERT_HEAD(&hash[val], ip, i_hash);
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}
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}
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simple_unlock(&filecore_ihash_slock);
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hashdone(oldhash, M_FILECOREMNT);
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}
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/*
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* Destroy node pool and hash table.
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*/
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void
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filecore_done()
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{
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pool_destroy(&filecore_node_pool);
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hashdone(filecorehashtbl, M_FILECOREMNT);
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}
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/*
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* Use the device/inum pair to find the incore inode, and return a pointer
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* to it. If it is in core, but locked, wait for it.
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*/
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struct vnode *
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filecore_ihashget(dev, inum)
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dev_t dev;
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ino_t inum;
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{
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struct filecore_node *ip;
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struct vnode *vp;
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loop:
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simple_lock(&filecore_ihash_slock);
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LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) {
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if (inum == ip->i_number && dev == ip->i_dev) {
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vp = ITOV(ip);
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simple_lock(&vp->v_interlock);
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simple_unlock(&filecore_ihash_slock);
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if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
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goto loop;
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return (vp);
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}
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}
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simple_unlock(&filecore_ihash_slock);
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return (NULL);
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}
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/*
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* Insert the inode into the hash table, and return it locked.
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*/
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void
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filecore_ihashins(ip)
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struct filecore_node *ip;
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{
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struct ihashhead *ipp;
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struct vnode *vp;
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simple_lock(&filecore_ihash_slock);
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ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
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LIST_INSERT_HEAD(ipp, ip, i_hash);
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simple_unlock(&filecore_ihash_slock);
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vp = ip->i_vnode;
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lockmgr(&vp->v_lock, LK_EXCLUSIVE, &vp->v_interlock);
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}
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/*
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* Remove the inode from the hash table.
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*/
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void
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filecore_ihashrem(ip)
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struct filecore_node *ip;
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{
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simple_lock(&filecore_ihash_slock);
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LIST_REMOVE(ip, i_hash);
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simple_unlock(&filecore_ihash_slock);
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}
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/*
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* Last reference to an inode, write the inode out and if necessary,
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* truncate and deallocate the file.
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*/
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int
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filecore_inactive(v)
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void *v;
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{
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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struct proc *p = ap->a_p;
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struct filecore_node *ip = VTOI(vp);
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int error = 0;
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if (prtactive && vp->v_usecount != 0)
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vprint("filecore_inactive: pushing active", vp);
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ip->i_flag = 0;
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VOP_UNLOCK(vp, 0);
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/*
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* If we are done with the inode, reclaim it
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* so that it can be reused immediately.
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*/
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if (filecore_staleinode(ip))
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vrecycle(vp, (struct simplelock *)0, p);
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return error;
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}
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/*
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* Reclaim an inode so that it can be used for other purposes.
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*/
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int
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filecore_reclaim(v)
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void *v;
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{
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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struct filecore_node *ip = VTOI(vp);
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if (prtactive && vp->v_usecount != 0)
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vprint("filecore_reclaim: pushing active", vp);
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/*
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* Remove the inode from its hash chain.
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*/
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filecore_ihashrem(ip);
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/*
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* Purge old data structures associated with the inode.
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*/
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cache_purge(vp);
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if (ip->i_devvp) {
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vrele(ip->i_devvp);
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ip->i_devvp = 0;
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}
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pool_put(&filecore_node_pool, vp->v_data);
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vp->v_data = NULL;
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return (0);
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}
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