Date: Wed, 3 Jul 2013 13:39:00 GMT From: Ivan Klymenko <fidaj@ukr.net> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/180236: Leakage free space using ZFS with nullfs on 9.1-STABLE Message-ID: <201307031339.r63Dd0ZP044587@oldred.freebsd.org> Resent-Message-ID: <201307031340.r63De1jp051180@freefall.freebsd.org>
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>Number: 180236
>Category: kern
>Synopsis: Leakage free space using ZFS with nullfs on 9.1-STABLE
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jul 03 13:40:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Ivan Klymenko
>Release: 9.1-STABLE
>Organization:
individual
>Environment:
FreeBSD nonamehost 9.1-STABLE FreeBSD 9.1-STABLE #13: Wed Jun 19 20:16:00 UTC 2013 root@nonamehost:/usr/src/obj/usr/src/sys/GENERIC amd64
>Description:
Leakage free space using ZFS with nullfs on 9.1-STABLE
I have a system with the installed version
uname -a
FreeBSD nonamehost 9.1-STABLE FreeBSD 9.1-STABLE #13: Wed Jun 19 20:16:00 UTC 2013 root@nonamehost:/usr/src/obj/usr/src/sys/GENERIC amd64
zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 10.0G 777G 31K none
rpool/root 10.0G 777G 3.38G legacy
>How-To-Repeat:
carry out preparatory actions
#****************************#
mkdir -p /mnt/nullfs
zfs create rpool/root/nullfs
zfs set mountpoint=/usr/nullfs rpool/root/nullfs
mount -t nullfs /usr/nullfs/ /mnt/nullfs/
#****************************#
zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 10.0G 777G 31K none
rpool/root 10.0G 777G 3.38G legacy
rpool/root/nullfs 31K 777G 31K /usr/nullfs
df -h
Filesystem Size Used Avail Capacity Mounted on
rpool/root 780G 3.4G 777G 0% /
devfs 1.0k 1.0k 0B 100% /dev
zswap 1.2G 31k 1.2G 0% /zswap
devfs 1.0k 1.0k 0B 100% /var/named/dev
rpool/root/nullfs 777G 31k 777G 0% /usr/nullfs
/usr/nullfs 777G 31k 777G 0% /mnt/nullfs
run the following script
#****************************#
#!/bin/sh
while [ 1 ]; do
[ -f "/tmp/stop" ] && exit
echo "1" > /mnt/nullfs/a
mv /mnt/nullfs/a /mnt/nullfs/b
done
#****************************#
two minutes later we get the following result
df -h | grep nullfs
rpool/root/nullfs 776G 127M 776G 0% /usr/nullfs
/usr/nullfs 776G 127M 776G 0% /mnt/nullfs
>Fix:
I do not know.
>Release-Note:
>Audit-Trail:
>Unformatted:
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