45a6fabe87
in preparation for an implementation of limiting code for kern.maxvnodes. MFC after: 3 days
573 lines
15 KiB
C
573 lines
15 KiB
C
/*
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*
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) src/sys/coda/coda_subr.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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* $FreeBSD$
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*
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1989 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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/*
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* This code was written for the Coda file system at Carnegie Mellon
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* University. Contributers include David Steere, James Kistler, and
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* M. Satyanarayanan.
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*/
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/* NOTES: rvb
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* 1. Added coda_unmounting to mark all cnodes as being UNMOUNTING. This has to
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* be done before dounmount is called. Because some of the routines that
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* dounmount calls before coda_unmounted might try to force flushes to venus.
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* The vnode pager does this.
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* 2. coda_unmounting marks all cnodes scanning coda_cache.
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* 3. cfs_checkunmounting (under DEBUG) checks all cnodes by chasing the vnodes
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* under the /coda mount point.
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* 4. coda_cacheprint (under DEBUG) prints names with vnode/cnode address
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*/
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#include <vcoda.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <coda/coda.h>
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#include <coda/cnode.h>
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#include <coda/coda_subr.h>
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#include <coda/coda_namecache.h>
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int coda_active = 0;
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int coda_reuse = 0;
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int coda_new = 0;
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struct cnode *coda_freelist = NULL;
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struct cnode *coda_cache[CODA_CACHESIZE];
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#define coda_hash(fid) (((fid)->Volume + (fid)->Vnode) & (CODA_CACHESIZE-1))
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#define CNODE_NEXT(cp) ((cp)->c_next)
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#define ODD(vnode) ((vnode) & 0x1)
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/*
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* Allocate a cnode.
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*/
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struct cnode *
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coda_alloc(void)
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{
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struct cnode *cp;
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if (coda_freelist) {
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cp = coda_freelist;
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coda_freelist = CNODE_NEXT(cp);
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coda_reuse++;
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}
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else {
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CODA_ALLOC(cp, struct cnode *, sizeof(struct cnode));
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/* NetBSD vnodes don't have any Pager info in them ('cause there are
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no external pagers, duh!) */
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#define VNODE_VM_INFO_INIT(vp) /* MT */
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VNODE_VM_INFO_INIT(CTOV(cp));
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coda_new++;
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}
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bzero(cp, sizeof (struct cnode));
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return(cp);
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}
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/*
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* Deallocate a cnode.
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*/
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void
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coda_free(cp)
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register struct cnode *cp;
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{
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CNODE_NEXT(cp) = coda_freelist;
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coda_freelist = cp;
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}
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/*
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* Put a cnode in the hash table
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*/
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void
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coda_save(cp)
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struct cnode *cp;
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{
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CNODE_NEXT(cp) = coda_cache[coda_hash(&cp->c_fid)];
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coda_cache[coda_hash(&cp->c_fid)] = cp;
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}
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/*
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* Remove a cnode from the hash table
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*/
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void
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coda_unsave(cp)
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struct cnode *cp;
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{
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struct cnode *ptr;
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struct cnode *ptrprev = NULL;
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ptr = coda_cache[coda_hash(&cp->c_fid)];
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while (ptr != NULL) {
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if (ptr == cp) {
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if (ptrprev == NULL) {
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coda_cache[coda_hash(&cp->c_fid)]
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= CNODE_NEXT(ptr);
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} else {
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CNODE_NEXT(ptrprev) = CNODE_NEXT(ptr);
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}
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CNODE_NEXT(cp) = (struct cnode *)NULL;
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return;
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}
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ptrprev = ptr;
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ptr = CNODE_NEXT(ptr);
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}
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}
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/*
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* Lookup a cnode by fid. If the cnode is dying, it is bogus so skip it.
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* NOTE: this allows multiple cnodes with same fid -- dcs 1/25/95
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*/
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struct cnode *
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coda_find(fid)
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ViceFid *fid;
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{
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struct cnode *cp;
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cp = coda_cache[coda_hash(fid)];
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while (cp) {
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if ((cp->c_fid.Vnode == fid->Vnode) &&
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(cp->c_fid.Volume == fid->Volume) &&
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(cp->c_fid.Unique == fid->Unique) &&
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(!IS_UNMOUNTING(cp)))
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{
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coda_active++;
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return(cp);
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}
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cp = CNODE_NEXT(cp);
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}
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return(NULL);
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}
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/*
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* coda_kill is called as a side effect to vcopen. To prevent any
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* cnodes left around from an earlier run of a venus or warden from
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* causing problems with the new instance, mark any outstanding cnodes
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* as dying. Future operations on these cnodes should fail (excepting
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* coda_inactive of course!). Since multiple venii/wardens can be
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* running, only kill the cnodes for a particular entry in the
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* coda_mnttbl. -- DCS 12/1/94 */
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int
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coda_kill(whoIam, dcstat)
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struct mount *whoIam;
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enum dc_status dcstat;
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{
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int hash, count = 0;
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struct cnode *cp;
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/*
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* Algorithm is as follows:
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* Second, flush whatever vnodes we can from the name cache.
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*
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* Finally, step through whatever is left and mark them dying.
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* This prevents any operation at all.
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*/
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/* This is slightly overkill, but should work. Eventually it'd be
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* nice to only flush those entries from the namecache that
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* reference a vnode in this vfs. */
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coda_nc_flush(dcstat);
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for (hash = 0; hash < CODA_CACHESIZE; hash++) {
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for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
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if (CTOV(cp)->v_mount == whoIam) {
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#ifdef DEBUG
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printf("coda_kill: vp %p, cp %p\n", CTOV(cp), cp);
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#endif
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count++;
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CODADEBUG(CODA_FLUSH,
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myprintf(("Live cnode fid %lx.%lx.%lx flags %d count %d\n",
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(cp->c_fid).Volume,
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(cp->c_fid).Vnode,
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(cp->c_fid).Unique,
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cp->c_flags,
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CTOV(cp)->v_usecount)); );
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}
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}
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}
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return count;
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}
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/*
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* There are two reasons why a cnode may be in use, it may be in the
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* name cache or it may be executing.
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*/
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void
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coda_flush(dcstat)
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enum dc_status dcstat;
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{
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int hash;
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struct cnode *cp;
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_FLUSH]++;
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coda_nc_flush(dcstat); /* flush files from the name cache */
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for (hash = 0; hash < CODA_CACHESIZE; hash++) {
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for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
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if (!ODD(cp->c_fid.Vnode)) /* only files can be executed */
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coda_vmflush(cp);
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}
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}
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}
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/*
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* As a debugging measure, print out any cnodes that lived through a
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* name cache flush.
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*/
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void
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coda_testflush(void)
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{
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int hash;
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struct cnode *cp;
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for (hash = 0; hash < CODA_CACHESIZE; hash++) {
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for (cp = coda_cache[hash];
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cp != NULL;
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cp = CNODE_NEXT(cp)) {
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myprintf(("Live cnode fid %lx.%lx.%lx count %d\n",
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(cp->c_fid).Volume,(cp->c_fid).Vnode,
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(cp->c_fid).Unique, CTOV(cp)->v_usecount));
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}
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}
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}
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/*
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* First, step through all cnodes and mark them unmounting.
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* NetBSD kernels may try to fsync them now that venus
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* is dead, which would be a bad thing.
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*
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*/
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void
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coda_unmounting(whoIam)
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struct mount *whoIam;
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{
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int hash;
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struct cnode *cp;
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for (hash = 0; hash < CODA_CACHESIZE; hash++) {
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for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
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if (CTOV(cp)->v_mount == whoIam) {
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if (cp->c_flags & (C_LOCKED|C_WANTED)) {
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printf("coda_unmounting: Unlocking %p\n", cp);
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cp->c_flags &= ~(C_LOCKED|C_WANTED);
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wakeup((caddr_t) cp);
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}
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cp->c_flags |= C_UNMOUNTING;
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}
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}
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}
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}
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#ifdef DEBUG
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void
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coda_checkunmounting(mp)
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struct mount *mp;
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{
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register struct vnode *vp, *nvp;
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struct cnode *cp;
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int count = 0, bad = 0;
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loop:
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for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) {
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if (vp->v_mount != mp)
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goto loop;
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nvp = TAILQ_NEXT(vp, v_nmntvnodes);
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cp = VTOC(vp);
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count++;
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if (!(cp->c_flags & C_UNMOUNTING)) {
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bad++;
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printf("vp %p, cp %p missed\n", vp, cp);
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cp->c_flags |= C_UNMOUNTING;
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}
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}
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}
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void
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coda_cacheprint(whoIam)
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struct mount *whoIam;
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{
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int hash;
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struct cnode *cp;
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int count = 0;
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printf("coda_cacheprint: coda_ctlvp %p, cp %p", coda_ctlvp, VTOC(coda_ctlvp));
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coda_nc_name(VTOC(coda_ctlvp));
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printf("\n");
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for (hash = 0; hash < CODA_CACHESIZE; hash++) {
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for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
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if (CTOV(cp)->v_mount == whoIam) {
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printf("coda_cacheprint: vp %p, cp %p", CTOV(cp), cp);
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coda_nc_name(cp);
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printf("\n");
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count++;
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}
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}
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}
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printf("coda_cacheprint: count %d\n", count);
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}
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#endif
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/*
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* There are 6 cases where invalidations occur. The semantics of each
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* is listed here.
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*
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* CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
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* CODA_PURGEUSER -- flush all entries from the name cache for a specific user
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* This call is a result of token expiration.
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*
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* The next two are the result of callbacks on a file or directory.
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* CODA_ZAPDIR -- flush the attributes for the dir from its cnode.
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* Zap all children of this directory from the namecache.
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* CODA_ZAPFILE -- flush the attributes for a file.
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*
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* The fifth is a result of Venus detecting an inconsistent file.
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* CODA_PURGEFID -- flush the attribute for the file
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* If it is a dir (odd vnode), purge its
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* children from the namecache
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* remove the file from the namecache.
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*
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* The sixth allows Venus to replace local fids with global ones
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* during reintegration.
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*
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* CODA_REPLACE -- replace one ViceFid with another throughout the name cache
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*/
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int handleDownCall(opcode, out)
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int opcode; union outputArgs *out;
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{
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int error;
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/* Handle invalidate requests. */
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switch (opcode) {
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case CODA_FLUSH : {
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coda_flush(IS_DOWNCALL);
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CODADEBUG(CODA_FLUSH,coda_testflush();) /* print remaining cnodes */
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return(0);
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}
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case CODA_PURGEUSER : {
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_PURGEUSER]++;
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/* XXX - need to prevent fsync's */
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coda_nc_purge_user(out->coda_purgeuser.cred.cr_uid, IS_DOWNCALL);
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return(0);
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}
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case CODA_ZAPFILE : {
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struct cnode *cp;
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error = 0;
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_ZAPFILE]++;
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cp = coda_find(&out->coda_zapfile.CodaFid);
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if (cp != NULL) {
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vref(CTOV(cp));
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cp->c_flags &= ~C_VATTR;
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if (CTOV(cp)->v_flag & VTEXT)
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error = coda_vmflush(cp);
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CODADEBUG(CODA_ZAPFILE, myprintf(("zapfile: fid = (%lx.%lx.%lx),
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refcnt = %d, error = %d\n",
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cp->c_fid.Volume,
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cp->c_fid.Vnode,
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cp->c_fid.Unique,
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CTOV(cp)->v_usecount - 1, error)););
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if (CTOV(cp)->v_usecount == 1) {
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cp->c_flags |= C_PURGING;
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}
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vrele(CTOV(cp));
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}
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return(error);
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}
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case CODA_ZAPDIR : {
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struct cnode *cp;
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_ZAPDIR]++;
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cp = coda_find(&out->coda_zapdir.CodaFid);
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if (cp != NULL) {
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vref(CTOV(cp));
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cp->c_flags &= ~C_VATTR;
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coda_nc_zapParentfid(&out->coda_zapdir.CodaFid, IS_DOWNCALL);
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CODADEBUG(CODA_ZAPDIR, myprintf(("zapdir: fid = (%lx.%lx.%lx),
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refcnt = %d\n",cp->c_fid.Volume,
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cp->c_fid.Vnode,
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cp->c_fid.Unique,
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CTOV(cp)->v_usecount - 1)););
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if (CTOV(cp)->v_usecount == 1) {
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cp->c_flags |= C_PURGING;
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}
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vrele(CTOV(cp));
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}
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return(0);
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}
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case CODA_PURGEFID : {
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struct cnode *cp;
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error = 0;
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_PURGEFID]++;
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cp = coda_find(&out->coda_purgefid.CodaFid);
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if (cp != NULL) {
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vref(CTOV(cp));
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if (ODD(out->coda_purgefid.CodaFid.Vnode)) { /* Vnode is a directory */
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coda_nc_zapParentfid(&out->coda_purgefid.CodaFid,
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IS_DOWNCALL);
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}
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cp->c_flags &= ~C_VATTR;
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coda_nc_zapfid(&out->coda_purgefid.CodaFid, IS_DOWNCALL);
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if (!(ODD(out->coda_purgefid.CodaFid.Vnode))
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&& (CTOV(cp)->v_flag & VTEXT)) {
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error = coda_vmflush(cp);
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}
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CODADEBUG(CODA_PURGEFID, myprintf(("purgefid: fid = (%lx.%lx.%lx), refcnt = %d, error = %d\n",
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cp->c_fid.Volume, cp->c_fid.Vnode,
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cp->c_fid.Unique,
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CTOV(cp)->v_usecount - 1, error)););
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if (CTOV(cp)->v_usecount == 1) {
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cp->c_flags |= C_PURGING;
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}
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vrele(CTOV(cp));
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}
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return(error);
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}
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case CODA_REPLACE : {
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struct cnode *cp = NULL;
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coda_clstat.ncalls++;
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coda_clstat.reqs[CODA_REPLACE]++;
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cp = coda_find(&out->coda_replace.OldFid);
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if (cp != NULL) {
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/* remove the cnode from the hash table, replace the fid, and reinsert */
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vref(CTOV(cp));
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coda_unsave(cp);
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cp->c_fid = out->coda_replace.NewFid;
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coda_save(cp);
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CODADEBUG(CODA_REPLACE, myprintf(("replace: oldfid = (%lx.%lx.%lx), newfid = (%lx.%lx.%lx), cp = %p\n",
|
|
out->coda_replace.OldFid.Volume,
|
|
out->coda_replace.OldFid.Vnode,
|
|
out->coda_replace.OldFid.Unique,
|
|
cp->c_fid.Volume, cp->c_fid.Vnode,
|
|
cp->c_fid.Unique, cp));)
|
|
vrele(CTOV(cp));
|
|
}
|
|
return (0);
|
|
}
|
|
default:
|
|
myprintf(("handleDownCall: unknown opcode %d\n", opcode));
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
/* coda_grab_vnode: lives in either cfs_mach.c or cfs_nbsd.c */
|
|
|
|
int
|
|
coda_vmflush(cp)
|
|
struct cnode *cp;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* kernel-internal debugging switches
|
|
*/
|
|
void coda_debugon(void)
|
|
{
|
|
codadebug = -1;
|
|
coda_nc_debug = -1;
|
|
coda_vnop_print_entry = 1;
|
|
coda_psdev_print_entry = 1;
|
|
coda_vfsop_print_entry = 1;
|
|
}
|
|
|
|
void coda_debugoff(void)
|
|
{
|
|
codadebug = 0;
|
|
coda_nc_debug = 0;
|
|
coda_vnop_print_entry = 0;
|
|
coda_psdev_print_entry = 0;
|
|
coda_vfsop_print_entry = 0;
|
|
}
|
|
|
|
/*
|
|
* Utilities used by both client and server
|
|
* Standard levels:
|
|
* 0) no debugging
|
|
* 1) hard failures
|
|
* 2) soft failures
|
|
* 3) current test software
|
|
* 4) main procedure entry points
|
|
* 5) main procedure exit points
|
|
* 6) utility procedure entry points
|
|
* 7) utility procedure exit points
|
|
* 8) obscure procedure entry points
|
|
* 9) obscure procedure exit points
|
|
* 10) random stuff
|
|
* 11) all <= 1
|
|
* 12) all <= 2
|
|
* 13) all <= 3
|
|
* ...
|
|
*/
|