Date: Fri, 19 Dec 1997 07:51:24 -0800 From: Cy Schubert - ITSD Open Systems Group <cschuber@uumail.gov.bc.ca> To: freebsd-hackers@freebsd.org Subject: Nullfs Problems Message-ID: <199712191552.HAA01050@cwsys.cwsent.com>
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I may have a solution for the nullfs, umapfs, and unionfs panics. The panics
are caused by a divide by zero trap when bsize is zero. I've tested this
against the ftp server problem posted a short while back. I've been testing
this for a short while and since I am not a FreeBSD kernel hacker (my
background was originally MVS kernel), I'd like to get some opinions about
this before submitting a PR to implement this.
--- src/sys/vm/vnode_pager.c.orig2 Sun Dec 7 13:11:03 1997
+++ src/sys/vm/vnode_pager.c Fri Dec 19 06:30:27 1997
@@ -231,10 +231,12 @@
blocksperpage = 0;
if (pagesperblock > 0) {
reqblock = pindex / pagesperblock;
- } else {
+ } else if (bsize > 0) {
blocksperpage = (PAGE_SIZE / bsize);
reqblock = pindex * blocksperpage;
- }
+ } else
+ return FALSE;
+
err = VOP_BMAP(vp, reqblock, (struct vnode **) 0, &bn,
after, before);
if (err)
Regards, Phone: (250)387-8437
Cy Schubert Fax: (250)387-5766
UNIX Support OV/VM: BCSC02(CSCHUBER)
ITSD BITNET: CSCHUBER@BCSC02.BITNET
Government of BC Internet: cschuber@uumail.gov.bc.ca
Cy.Schubert@gems8.gov.bc.ca
"Quit spooling around, JES do it."
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