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fix locking issues uncovered by LOCKDEBUG, reorganize code a bit so that

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even the initial directory notify request is sent by smbkq thread
problems found during LOCKDEBUG hunt, adresses PR kern/21067 by Martin Husemann
This commit is contained in:
jdolecek 2003-04-08 18:16:01 +00:00
parent dfc728f814
commit 3068339e18
1 changed files with 33 additions and 17 deletions
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50
sys/fs/smbfs/smbfs_kq.c
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@ -1,4 +1,4 @@
/* $NetBSD: smbfs_kq.c,v 1.3 2003/04/07 12:04:15 jdolecek Exp $ */
/* $NetBSD: smbfs_kq.c,v 1.4 2003/04/08 18:16:01 jdolecek Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: smbfs_kq.c,v 1.3 2003/04/07 12:04:15 jdolecek Exp $");
__KERNEL_RCSID(0, "$NetBSD: smbfs_kq.c,v 1.4 2003/04/08 18:16:01 jdolecek Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -131,14 +131,13 @@ smbfs_kqpoll(void *arg)
{
struct kevq *ke;
struct vattr attr;
int error;
int error=0;
struct proc *p = smbkqp;
u_quad_t osize;
int needwake;
simple_lock(&smbkq_lock);
for(;;) {
simple_lock(&smbkq_lock);
/* check all entries on poll list for changes */
SLIST_FOREACH(ke, &kplist, k_link) {
/* skip if still in attrcache */
@ -197,7 +196,6 @@ smbfs_kqpoll(void *arg)
/* Exit if there are no more kevents to watch for */
if (kevs == 0) {
smbkqp = NULL;
simple_unlock(&smbkq_lock);
break;
}
@ -205,8 +203,11 @@ smbfs_kqpoll(void *arg)
needwake = !SLIST_EMPTY(&kplist);
/* wait a while before checking for changes again */
error = ltsleep(smbkqp, PSOCK, "smbkqidl",
needwake ? (SMBFS_ATTRTIMO * hz / 2) : 0, &smbkq_lock);
if (SLIST_EMPTY(&kdnlist)) {
error = ltsleep(smbkqp, PSOCK, "smbkqidl",
needwake ? (SMBFS_ATTRTIMO * hz / 2) : 0,
&smbkq_lock);
}
if (!error) {
/* woken up, check if any pending notifications */
@ -219,6 +220,15 @@ smbfs_kqpoll(void *arg)
SLIST_NEXT(ke, k_link) = NULL;
splx(s);
/* drop lock while processing */
simple_unlock(&smbkq_lock);
/*
* Skip fetch if not yet setup.
*/
if (__predict_false(ke->rq == NULL))
goto notifyrq;
error = smbfs_smb_nt_dirnotify_fetch(ke->rq,
&hint);
ke->rq = NULL; /* rq deallocated by now */
@ -234,14 +244,19 @@ smbfs_kqpoll(void *arg)
VN_KNOTE(ke->vp, hint);
notifyrq:
/* reissue the notify request */
(void) smbfs_smb_nt_dirnotify_setup(
VTOSMB(ke->vp),
&ke->rq, &smbkq_scred,
smbfskq_dirnotify, ke);
/* reacquire the lock */
simple_lock(&smbkq_lock);
}
}
}
simple_unlock(&smbkq_lock);
kthread_exit(0);
}
@ -450,6 +465,7 @@ smbfs_kqfilter(void *v)
FREE(ken, M_KEVENT); /* dispose, don't need */
} else {
/* need a new one */
memset(ken, 0, sizeof(*ken));
ke = ken;
ke->vp = vp;
ke->usecount = 1;
@ -459,16 +475,16 @@ smbfs_kqfilter(void *v)
ke->onlink = attr.va_nlink;
if (dnot) {
/* If directory notify, queue request for execution */
SLIST_NEXT(ke, k_link) = NULL;
int s;
error = smbfs_smb_nt_dirnotify_setup(VTOSMB(vp),
&ke->rq, &smbkq_scred, smbfskq_dirnotify, ke);
if (error) {
kevs--;
FREE(ke, M_KEVENT);
return (error);
}
/*
* Add kevent to list of 'need attend' kevnets.
* The handler will pick it up and setup request
* appropriately.
*/
s = splnet();
SLIST_INSERT_HEAD(&kdnlist, ke, k_link);
splx(s);
dnot_num++;
} else {
/* add to poll list */