clonefs example: O_TRUNC not permitted

What steps will reproduce the problem?

# clonefs -addr :564 &        # p/srv/examples/clonefs
# mkdir /mnt/clonefs
# mount -t 9p 127.0.0.1 /mnt/clonefs
# cd /mnt/clonefs
# cat clone
1#
# echo text >>1
# echo text >1
bash: 1: Operation not permitted
# 

What is the expected output? What do you see instead?

Expected "echo text >1" to succeed.

What version of the product are you using? On what operating system?

$ hg tip
changeset:   106:2de9ef38f3b6
tag:         tip
user:        Andrey Mirtchovski <mirtchovski@gmail.com>
date:        Mon Apr 02 13:44:29 2012 -0600
summary:     Hardcoded certificates have expired. Allow "insecure" connections 
by skipping the verify step until

$ uname -a
Linux hostname 2.6.38-11-generic-pae #50-Ubuntu SMP Mon Sep 12 22:21:04 UTC 
2011 i686 i686 i386 GNU/Linux
$ 

Please provide any additional information below.

I recently wrote a trivial fs following the example code in timefs and clonefs 
and 
noticed the above error.  Perhaps it is not by design?

http://9fans.net/archive/?q=%279pserve+question%27&go=Grep
seems to be related (strace and clonefs -d output attached);
applying the below patch fixes the issue.

$ hg diff .
diff -r 2de9ef38f3b6 p/srv/examples/clonefs/clonefs.go
--- a/p/srv/examples/clonefs/clonefs.go Mon Apr 02 13:44:29 2012 -0600
+++ b/p/srv/examples/clonefs/clonefs.go Mon Apr 30 18:45:45 2012 +0530
@@ -73,6 +73,10 @@
    return len(data), nil
 }

+func (cl *ClFile) Wstat(fid *srv.FFid, dir *p.Dir) error {
+   return nil
+}
+
 func (cl *ClFile) Remove(fid *srv.FFid) error {
    log.Println("Remove")
    return nil
$ 

Thanks for go9p and the nice examples!
Arvindh

Original issue reported on code.google.com by a...@a-30.net on 30 Apr 2012 at 2:00

Attachments:

log.txt

nilium / go9p

clonefs example: O_TRUNC not permitted #20