574 lines
14 KiB
C
574 lines
14 KiB
C
/*-
|
|
* Coda: an Experimental Distributed File System
|
|
* Release 3.1
|
|
*
|
|
* Copyright (c) 1987-1998 Carnegie Mellon University
|
|
* All Rights Reserved
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and its
|
|
* documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation, and
|
|
* that credit is given to Carnegie Mellon University in all documents
|
|
* and publicity pertaining to direct or indirect use of this code or its
|
|
* derivatives.
|
|
*
|
|
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
|
|
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
|
|
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
|
|
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
|
|
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
|
|
* ANY DERIVATIVE WORK.
|
|
*
|
|
* Carnegie Mellon encourages users of this software to return any
|
|
* improvements or extensions that they make, and to grant Carnegie
|
|
* Mellon the rights to redistribute these changes without encumbrance.
|
|
*
|
|
* @(#) src/sys/coda/coda_subr.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
|
|
*/
|
|
/*-
|
|
* Mach Operating System
|
|
* Copyright (c) 1989 Carnegie-Mellon University
|
|
* All rights reserved. The CMU software License Agreement specifies
|
|
* the terms and conditions for use and redistribution.
|
|
*/
|
|
|
|
/*
|
|
* This code was written for the Coda filesystem at Carnegie Mellon
|
|
* University. Contributers include David Steere, James Kistler, and
|
|
* M. Satyanarayanan.
|
|
*/
|
|
|
|
/* NOTES: rvb
|
|
* 1. Added coda_unmounting to mark all cnodes as being UNMOUNTING. This has to
|
|
* be done before dounmount is called. Because some of the routines that
|
|
* dounmount calls before coda_unmounted might try to force flushes to venus.
|
|
* The vnode pager does this.
|
|
* 2. coda_unmounting marks all cnodes scanning coda_cache.
|
|
* 3. cfs_checkunmounting (under DEBUG) checks all cnodes by chasing the vnodes
|
|
* under the /coda mount point.
|
|
* 4. coda_cacheprint (under DEBUG) prints names with vnode/cnode address
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/mount.h>
|
|
|
|
#include <coda/coda.h>
|
|
#include <coda/cnode.h>
|
|
#include <coda/coda_subr.h>
|
|
#include <coda/coda_namecache.h>
|
|
|
|
int coda_active = 0;
|
|
int coda_reuse = 0;
|
|
int coda_new = 0;
|
|
|
|
struct cnode *coda_freelist = NULL;
|
|
struct cnode *coda_cache[CODA_CACHESIZE];
|
|
|
|
#define CNODE_NEXT(cp) ((cp)->c_next)
|
|
|
|
#ifdef CODA_COMPAT_5
|
|
#define coda_hash(fid) \
|
|
(((fid)->Volume + (fid)->Vnode) & (CODA_CACHESIZE-1))
|
|
#define IS_DIR(cnode) (cnode.Vnode & 0x1)
|
|
#else
|
|
#define coda_hash(fid) (coda_f2i(fid) & (CODA_CACHESIZE-1))
|
|
#define IS_DIR(cnode) (cnode.opaque[2] & 0x1)
|
|
#endif
|
|
|
|
/*
|
|
* Allocate a cnode.
|
|
*/
|
|
struct cnode *
|
|
coda_alloc(void)
|
|
{
|
|
struct cnode *cp;
|
|
|
|
if (coda_freelist) {
|
|
cp = coda_freelist;
|
|
coda_freelist = CNODE_NEXT(cp);
|
|
coda_reuse++;
|
|
}
|
|
else {
|
|
CODA_ALLOC(cp, struct cnode *, sizeof(struct cnode));
|
|
/* NetBSD vnodes don't have any Pager info in them ('cause there are
|
|
no external pagers, duh!) */
|
|
#define VNODE_VM_INFO_INIT(vp) /* MT */
|
|
VNODE_VM_INFO_INIT(CTOV(cp));
|
|
coda_new++;
|
|
}
|
|
bzero(cp, sizeof (struct cnode));
|
|
|
|
return(cp);
|
|
}
|
|
|
|
/*
|
|
* Deallocate a cnode.
|
|
*/
|
|
void
|
|
coda_free(cp)
|
|
register struct cnode *cp;
|
|
{
|
|
|
|
CNODE_NEXT(cp) = coda_freelist;
|
|
coda_freelist = cp;
|
|
}
|
|
|
|
/*
|
|
* Put a cnode in the hash table
|
|
*/
|
|
void
|
|
coda_save(cp)
|
|
struct cnode *cp;
|
|
{
|
|
CNODE_NEXT(cp) = coda_cache[coda_hash(&cp->c_fid)];
|
|
coda_cache[coda_hash(&cp->c_fid)] = cp;
|
|
}
|
|
|
|
/*
|
|
* Remove a cnode from the hash table
|
|
*/
|
|
void
|
|
coda_unsave(cp)
|
|
struct cnode *cp;
|
|
{
|
|
struct cnode *ptr;
|
|
struct cnode *ptrprev = NULL;
|
|
|
|
ptr = coda_cache[coda_hash(&cp->c_fid)];
|
|
while (ptr != NULL) {
|
|
if (ptr == cp) {
|
|
if (ptrprev == NULL) {
|
|
coda_cache[coda_hash(&cp->c_fid)]
|
|
= CNODE_NEXT(ptr);
|
|
} else {
|
|
CNODE_NEXT(ptrprev) = CNODE_NEXT(ptr);
|
|
}
|
|
CNODE_NEXT(cp) = (struct cnode *)NULL;
|
|
|
|
return;
|
|
}
|
|
ptrprev = ptr;
|
|
ptr = CNODE_NEXT(ptr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lookup a cnode by fid. If the cnode is dying, it is bogus so skip it.
|
|
* NOTE: this allows multiple cnodes with same fid -- dcs 1/25/95
|
|
*/
|
|
struct cnode *
|
|
coda_find(fid)
|
|
CodaFid *fid;
|
|
{
|
|
struct cnode *cp;
|
|
|
|
cp = coda_cache[coda_hash(fid)];
|
|
while (cp) {
|
|
if (coda_fid_eq(&(cp->c_fid), fid) &&
|
|
(!IS_UNMOUNTING(cp)))
|
|
{
|
|
coda_active++;
|
|
return(cp);
|
|
}
|
|
cp = CNODE_NEXT(cp);
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* coda_kill is called as a side effect to vcopen. To prevent any
|
|
* cnodes left around from an earlier run of a venus or warden from
|
|
* causing problems with the new instance, mark any outstanding cnodes
|
|
* as dying. Future operations on these cnodes should fail (excepting
|
|
* coda_inactive of course!). Since multiple venii/wardens can be
|
|
* running, only kill the cnodes for a particular entry in the
|
|
* coda_mnttbl. -- DCS 12/1/94 */
|
|
|
|
int
|
|
coda_kill(whoIam, dcstat)
|
|
struct mount *whoIam;
|
|
enum dc_status dcstat;
|
|
{
|
|
int hash, count = 0;
|
|
struct cnode *cp;
|
|
|
|
/*
|
|
* Algorithm is as follows:
|
|
* Second, flush whatever vnodes we can from the name cache.
|
|
*
|
|
* Finally, step through whatever is left and mark them dying.
|
|
* This prevents any operation at all.
|
|
*/
|
|
|
|
/* This is slightly overkill, but should work. Eventually it'd be
|
|
* nice to only flush those entries from the namecache that
|
|
* reference a vnode in this vfs. */
|
|
coda_nc_flush(dcstat);
|
|
|
|
for (hash = 0; hash < CODA_CACHESIZE; hash++) {
|
|
for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
|
|
if (CTOV(cp)->v_mount == whoIam) {
|
|
#ifdef DEBUG
|
|
printf("coda_kill: vp %p, cp %p\n", CTOV(cp), cp);
|
|
#endif
|
|
count++;
|
|
CODADEBUG(CODA_FLUSH,
|
|
myprintf(("Live cnode fid %s flags %d count %d\n",
|
|
coda_f2s(&cp->c_fid),
|
|
cp->c_flags,
|
|
vrefcnt(CTOV(cp)))); );
|
|
}
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* There are two reasons why a cnode may be in use, it may be in the
|
|
* name cache or it may be executing.
|
|
*/
|
|
void
|
|
coda_flush(dcstat)
|
|
enum dc_status dcstat;
|
|
{
|
|
int hash;
|
|
struct cnode *cp;
|
|
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_FLUSH]++;
|
|
|
|
coda_nc_flush(dcstat); /* flush files from the name cache */
|
|
|
|
for (hash = 0; hash < CODA_CACHESIZE; hash++) {
|
|
for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
|
|
if (!IS_DIR(cp->c_fid)) /* only files can be executed */
|
|
coda_vmflush(cp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* As a debugging measure, print out any cnodes that lived through a
|
|
* name cache flush.
|
|
*/
|
|
void
|
|
coda_testflush(void)
|
|
{
|
|
int hash;
|
|
struct cnode *cp;
|
|
|
|
for (hash = 0; hash < CODA_CACHESIZE; hash++) {
|
|
for (cp = coda_cache[hash];
|
|
cp != NULL;
|
|
cp = CNODE_NEXT(cp)) {
|
|
myprintf(("Live cnode fid %s count %d\n",
|
|
coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* First, step through all cnodes and mark them unmounting.
|
|
* NetBSD kernels may try to fsync them now that venus
|
|
* is dead, which would be a bad thing.
|
|
*
|
|
*/
|
|
void
|
|
coda_unmounting(whoIam)
|
|
struct mount *whoIam;
|
|
{
|
|
int hash;
|
|
struct cnode *cp;
|
|
|
|
for (hash = 0; hash < CODA_CACHESIZE; hash++) {
|
|
for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
|
|
if (CTOV(cp)->v_mount == whoIam) {
|
|
if (cp->c_flags & (C_LOCKED|C_WANTED)) {
|
|
printf("coda_unmounting: Unlocking %p\n", cp);
|
|
cp->c_flags &= ~(C_LOCKED|C_WANTED);
|
|
wakeup((caddr_t) cp);
|
|
}
|
|
cp->c_flags |= C_UNMOUNTING;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
coda_checkunmounting(mp)
|
|
struct mount *mp;
|
|
{
|
|
struct vnode *vp, *nvp;
|
|
struct cnode *cp;
|
|
int count = 0, bad = 0;
|
|
|
|
MNT_ILOCK(mp);
|
|
MNT_VNODE_FOREACH(vp, mp, nvp) {
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
cp = VTOC(vp);
|
|
count++;
|
|
if (!(cp->c_flags & C_UNMOUNTING)) {
|
|
bad++;
|
|
printf("vp %p, cp %p missed\n", vp, cp);
|
|
cp->c_flags |= C_UNMOUNTING;
|
|
}
|
|
VI_UNLOCK(vp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
void
|
|
coda_cacheprint(whoIam)
|
|
struct mount *whoIam;
|
|
{
|
|
int hash;
|
|
struct cnode *cp;
|
|
int count = 0;
|
|
|
|
printf("coda_cacheprint: coda_ctlvp %p, cp %p", coda_ctlvp, VTOC(coda_ctlvp));
|
|
coda_nc_name(VTOC(coda_ctlvp));
|
|
printf("\n");
|
|
|
|
for (hash = 0; hash < CODA_CACHESIZE; hash++) {
|
|
for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
|
|
if (CTOV(cp)->v_mount == whoIam) {
|
|
printf("coda_cacheprint: vp %p, cp %p", CTOV(cp), cp);
|
|
coda_nc_name(cp);
|
|
printf("\n");
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
printf("coda_cacheprint: count %d\n", count);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* There are 6 cases where invalidations occur. The semantics of each
|
|
* is listed here.
|
|
*
|
|
* CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
|
|
* CODA_PURGEUSER -- flush all entries from the name cache for a specific user
|
|
* This call is a result of token expiration.
|
|
*
|
|
* The next two are the result of callbacks on a file or directory.
|
|
* CODA_ZAPDIR -- flush the attributes for the dir from its cnode.
|
|
* Zap all children of this directory from the namecache.
|
|
* CODA_ZAPFILE -- flush the attributes for a file.
|
|
*
|
|
* The fifth is a result of Venus detecting an inconsistent file.
|
|
* CODA_PURGEFID -- flush the attribute for the file
|
|
* If it is a dir (odd vnode), purge its
|
|
* children from the namecache
|
|
* remove the file from the namecache.
|
|
*
|
|
* The sixth allows Venus to replace local fids with global ones
|
|
* during reintegration.
|
|
*
|
|
* CODA_REPLACE -- replace one CodaFid with another throughout the name cache
|
|
*/
|
|
|
|
int handleDownCall(opcode, out)
|
|
int opcode; union outputArgs *out;
|
|
{
|
|
int error;
|
|
|
|
/* Handle invalidate requests. */
|
|
switch (opcode) {
|
|
case CODA_FLUSH : {
|
|
|
|
coda_flush(IS_DOWNCALL);
|
|
|
|
CODADEBUG(CODA_FLUSH,coda_testflush();) /* print remaining cnodes */
|
|
return(0);
|
|
}
|
|
|
|
case CODA_PURGEUSER : {
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_PURGEUSER]++;
|
|
|
|
/* XXX - need to prevent fsync's */
|
|
#ifdef CODA_COMPAT_5
|
|
coda_nc_purge_user(out->coda_purgeuser.cred.cr_uid, IS_DOWNCALL);
|
|
#else
|
|
coda_nc_purge_user(out->coda_purgeuser.uid, IS_DOWNCALL);
|
|
#endif
|
|
return(0);
|
|
}
|
|
|
|
case CODA_ZAPFILE : {
|
|
struct cnode *cp;
|
|
|
|
error = 0;
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_ZAPFILE]++;
|
|
|
|
cp = coda_find(&out->coda_zapfile.Fid);
|
|
if (cp != NULL) {
|
|
vref(CTOV(cp));
|
|
|
|
cp->c_flags &= ~C_VATTR;
|
|
ASSERT_VOP_LOCKED(CTOV(cp), "coda HandleDownCall");
|
|
if (CTOV(cp)->v_vflag & VV_TEXT)
|
|
error = coda_vmflush(cp);
|
|
CODADEBUG(CODA_ZAPFILE,
|
|
myprintf(("zapfile: fid = %s, refcnt = %d, error = %d\n",
|
|
coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
|
|
if (vrefcnt(CTOV(cp)) == 1) {
|
|
cp->c_flags |= C_PURGING;
|
|
}
|
|
vrele(CTOV(cp));
|
|
}
|
|
|
|
return(error);
|
|
}
|
|
|
|
case CODA_ZAPDIR : {
|
|
struct cnode *cp;
|
|
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_ZAPDIR]++;
|
|
|
|
cp = coda_find(&out->coda_zapdir.Fid);
|
|
if (cp != NULL) {
|
|
vref(CTOV(cp));
|
|
|
|
cp->c_flags &= ~C_VATTR;
|
|
coda_nc_zapParentfid(&out->coda_zapdir.Fid, IS_DOWNCALL);
|
|
|
|
CODADEBUG(CODA_ZAPDIR, myprintf((
|
|
"zapdir: fid = %s, refcnt = %d\n",
|
|
coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1)););
|
|
if (vrefcnt(CTOV(cp)) == 1) {
|
|
cp->c_flags |= C_PURGING;
|
|
}
|
|
vrele(CTOV(cp));
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
case CODA_PURGEFID : {
|
|
struct cnode *cp;
|
|
|
|
error = 0;
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_PURGEFID]++;
|
|
|
|
cp = coda_find(&out->coda_purgefid.Fid);
|
|
if (cp != NULL) {
|
|
vref(CTOV(cp));
|
|
if (IS_DIR(out->coda_purgefid.Fid)) { /* Vnode is a directory */
|
|
coda_nc_zapParentfid(&out->coda_purgefid.Fid,IS_DOWNCALL);
|
|
}
|
|
cp->c_flags &= ~C_VATTR;
|
|
coda_nc_zapfid(&out->coda_purgefid.Fid, IS_DOWNCALL);
|
|
ASSERT_VOP_LOCKED(CTOV(cp), "coda HandleDownCall");
|
|
if (!(IS_DIR(out->coda_purgefid.Fid))
|
|
&& (CTOV(cp)->v_vflag & VV_TEXT)) {
|
|
|
|
error = coda_vmflush(cp);
|
|
}
|
|
CODADEBUG(CODA_PURGEFID, myprintf((
|
|
"purgefid: fid = %s, refcnt = %d, error = %d\n",
|
|
coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
|
|
if (vrefcnt(CTOV(cp)) == 1) {
|
|
cp->c_flags |= C_PURGING;
|
|
}
|
|
vrele(CTOV(cp));
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
case CODA_REPLACE : {
|
|
struct cnode *cp = NULL;
|
|
|
|
coda_clstat.ncalls++;
|
|
coda_clstat.reqs[CODA_REPLACE]++;
|
|
|
|
cp = coda_find(&out->coda_replace.OldFid);
|
|
if (cp != NULL) {
|
|
/* remove the cnode from the hash table, replace the fid, and reinsert */
|
|
vref(CTOV(cp));
|
|
coda_unsave(cp);
|
|
cp->c_fid = out->coda_replace.NewFid;
|
|
coda_save(cp);
|
|
|
|
CODADEBUG(CODA_REPLACE, myprintf((
|
|
"replace: oldfid = %s, newfid = %s, cp = %p\n",
|
|
coda_f2s(&out->coda_replace.OldFid),
|
|
coda_f2s(&cp->c_fid), 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
|
|
* ...
|
|
*/
|