Date: Thu, 01 Sep 2005 10:43:26 +0200 From: Ralf Wenk <RZ-FreeBSD0605@hs-karlsruhe.de> To: FreeBSD-gnats-submit@FreeBSD.org Cc: Ralf Wenk <RZ-FreeBSD0605@hs-karlsruhe.de> Subject: conf/85558: initdiskless should not generate memory disks with soft-updates enabled Message-ID: <E1EAkfO-000AnK-Cg@RZ-Wenk1.HS-Karlsruhe.DE> Resent-Message-ID: <200509010850.j818oDj4093459@freefall.freebsd.org>
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>Number: 85558
>Category: conf
>Synopsis: initdiskless should not generate memory disks with soft-updates enabled
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Sep 01 08:50:13 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Ralf Wenk
>Release: FreeBSD 5.4-STABLE i386
>Organization:
Hochschule Karlsruhe - Technik und Wirtschaft, University of Applied Sciences
>Environment:
System: FreeBSD RZ-Wenk1 5.4-STABLE FreeBSD 5.4-STABLE #2: Mon Aug 22 09:29:37 CEST 2005 wera0003@RZ-FreeBSD1:/usr/obj/usr/src/sys/fsc-t-diskless-SMP i386
>Description:
When booting diskless initdiskless creates memory disks with soft-updates
enabeld. The delayed freeing of blocks occupied by removed files causes
suprious 'file system full' messages in our diskless environment while
initdiskless is running and building the final /etc directory. These
messages occured more often with a SMP kernel (9 times out of 10) than
with a non SMP kernel (5 times out of 10). The resulting memory disk
containing /etc is 84% used.
This behaviour was never seen as long as we used 5.3. It was discovered
almost immediately after upgrading to STABLE. I think it shows up because
of the finer locking in STABLE.
>How-To-Repeat:
Use a diskless environment and a not too big memory disk. Replace varoius
files in it with the different templates initdiskless uses.
>Fix:
Add the -S switch to the mdmfs call in mount_md() in initdiskless to disable
the use of soft-updates in memory disks.
--- initdiskless.udiff begins here ---
--- etc.old/rc.d/initdiskless Tue Apr 5 14:06:37 2005
+++ etc/rc.d/initdiskless Mon Aug 22 09:04:47 2005
@@ -151,7 +151,7 @@
# Create a generic memory disk
#
mount_md() {
- /sbin/mdmfs -i 4096 -s $1 -M md $2
+ /sbin/mdmfs -S -i 4096 -s $1 -M md $2
}
# Create the memory filesystem if it has not already been created
--- initdiskless.udiff ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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