chflags on zfs (sappnd)

[George Mamalakis]

Hi everbody,

from http://wiki.freebsd.org/ZFS I understand that chflags are supported 
by zfs. But if I have a file with sappnd on a zfs filesystem, I am 
unable to execute a command like this:

# touch lili
# chflags sappnd lili
# ls -lrto lili
-rw-r--r--  1 root  wheel  sappnd 5 Nov 17 12:38 lili
# echo "lala" >> lili
# echo "lala" >> lili
-su: echo: write error: Operation not permitted

So, the first time it worked, but it stops working on any consequent 
time (when the file is no more empty).
I found a bug report on:

http://www.freebsd.org/cgi/query-pr.cgi?pr=149495

where a patch is suggested. Nevertheless, even though my sources are 
newer than the suggested patch, my source tree does not contain it.
Do we know anything more about it?

# uname -a
FreeBSD myhost 8.1-STABLE FreeBSD 8.1-STABLE #1: Fri Nov  5 17:27:37 EET 
2010     root@:/mnt/obj/mnt/src/sys/GENERIC  amd64

Thank you all for your time in advance,

mamalos

-- 
George Mamalakis

IT Officer
Electrical and Computer Engineer (Aristotle Un. of Thessaloniki),
MSc (Imperial College of London)

Department of Electrical and Computer Engineering
Faculty of Engineering
Aristotle University of Thessaloniki

phone number : +30 (2310) 994379