a180cee23b
deal with shortages of the VM maps where the backing pages are mapped (usually kmem_map). Try to deal with this: * Group all information about the backend allocator for a pool in a separate structure. The pool references this structure, rather than the individual fields. * Change the pool_init() API accordingly, and adjust all callers. * Link all pools using the same backend allocator on a list. * The backend allocator is responsible for waiting for physical memory to become available, but will still fail if it cannot callocate KVA space for the pages. If this happens, carefully drain all pools using the same backend allocator, so that some KVA space can be freed. * Change pool_reclaim() to indicate if it actually succeeded in freeing some pages, and use that information to make draining easier and more efficient. * Get rid of PR_URGENT. There was only one use of it, and it could be dealt with by the caller. From art@openbsd.org.
248 lines
6.5 KiB
C
248 lines
6.5 KiB
C
/* $NetBSD: filecore_node.c,v 1.10 2002/03/08 20:48:40 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 Andrew McMurry
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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. 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 1.10 2002/03/08 20:48:40 thorpej 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 <filecorefs/filecore.h>
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#include <filecorefs/filecore_extern.h>
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#include <filecorefs/filecore_node.h>
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#include <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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