[Qemu-devel] Re: virtio-9p error

["Venkateswararao Jujjuri (JV)" <jvrao@linux.vnet.ibm.com>]

Bruno Cesar Ribas wrote:
> Hi,
> 
> Every time I try to rsync something to my 9p fs mounted I get the following
> message on guest kernel:
> 
> 8<--------------------
> [   45.866789] 9pnet_virtio virtio2: requests:id 0 is not a head!
> 8<--------------------
> 
> I'm "sending" the FS with the following argument via qemu-kvm (commit head
> 422476cc422 of August 12):
>  -virtfs local,path=/home/outras/montecristo,mount_tag=home,security_model=passthrough
> 
> And I'm mounting on the guest with:
>    mount -t 9p -o trans=virtio home /home
> 
> My guest is running kernel 2.6.34.

I tested with the latest kernel, 2.6.35-rc6+ ..


rsync -avz guest:/pmnt/rsync_dir/ /tmp/rsync_dir/
rsync /pmnt/rsync_dir/ /tmp/rsync_dir/
rsync  -aHx --progress  host:/tmp/rsync_dir/ /pmnt/rsync_dir/

This quick test is with QEMU patches that are on mailing lists but not merged
into mainline.
Being said that, I don't think they really affect this.

> 
> After I start the rsync (a second later) i get the message i showed above
> and the the virtio fs crashes and i have to reboot the virtual machine.
> 
> Another 'interesting' thing is that the filesystem wont show in 'df'. But
> appears correct in /proc/mounts

This works only on 9P2000.L protocol. (Need "-o version=9p2000.L" option on the
mount)
But please note that, all the 9P2000.L protocol patches are not yet merged into
QEMU.

Thanks,
JV

> 
> 8<--------------------
> montecristo-nova:/home# mount|tail -1
> home on /home type 9p (rw,sync,dirsync,relatime,trans=virtio)
> 8<--------------------
> 
> 
> Here is a little of my rsync output:
> 
> 8<--------------------
> montecristo-nova:/home# cd nobackup/
> montecristo-nova:/home/nobackup# rsync -aHx --progress xadrezlivre:/ xadrezlivre/
> receiving incremental file list
> rsync: symlink "/home/nobackup/xadrezlivre/cdrom" -> "media/cdrom"
> failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/initrd.img" ->
> "boot/initrd.img-2.6.26-1-486" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/initrd.img.old" ->
> "boot/initrd.img-2.6.18-6-486" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/vmlinuz" ->
> "boot/vmlinuz-2.6.26-1-486" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/vmlinuz.old" ->
> "boot/vmlinuz-2.6.18-6-486" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/bin/nc" ->
> "/etc/alternatives/nc" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/bin/netcat" ->
> "/etc/alternatives/netcat" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/bin/pidof" ->
> "../sbin/killall5" failed: No such file or directory (2)
> rsync: symlink "/home/nobackup/xadrezlivre/bin/rnano" -> "nano"
> failed: No such file or directory (2)
> 8<--------------------
> 
> If anyone knows what it is or what else should I send to understand better
> the problem, please tell me
> 
> Thanks in advance
>