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[Qemu-devel] [Bug 646427] Re: VirtFS mapped symlinks resolved wrong


From: Moshroum
Subject: [Qemu-devel] [Bug 646427] Re: VirtFS mapped symlinks resolved wrong
Date: Fri, 24 Sep 2010 20:45:22 -0000

But mapped is also really confusing. Everything inside the vm:

$ id
uid=0(root) gid=0(root) groups=0(root)
$ touch newfile
$ -rw-r--r-- 1 root 1000 0 Sep 24 20:39 newfile

So the gid is not set correctly. On thhe host:

% xattr newfile
user.virtfs.uid
user.virtfs.mode

I started it using:
% /usr/local/kvm/bin/qemu-system-x86_64 -m 1024 -kernel linux-2.6.35.5.qemu 
-drive file=root.cow1,if=virtio -net 
nic,macaddr=02:ca:ff:ee:ba:be,model=virtio,vlan=1 -net 
tap,ifname=tap1,vlan=1,script=no -virtfs 
local,path=/shared,security_model=mapped,mount_tag=host -nographic

-- 
VirtFS mapped symlinks resolved wrong
https://bugs.launchpad.net/bugs/646427
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Status in QEMU: New

Bug description:
I tried to map a folder with qemu-kvm qemu-kvm-0.13.0-rc1-3-gc9c2179 (this is 
v0.13.0-rc1-16667-gc9c2179). I mounted it first in passthrough mode and saw all 
symlinks as expected. Then I used mapped and noticed that the target of a 
symlink changed to the actual data inside the linked folder as target instead 
of the target filename.

So for example if you have a file abc with the content "omg, this is important 
stuff" and a symlink lnkme -> abc then it wiill look inside the kvm with 
mounted 9p virtio (mapped) like that:

lnkme -> omg, this is important stuff



Another problem I noticed was that I cannot mount it (mapped or passthrough) 
using /etc/rc.local or /etc/fstab, but after login as root using

mount /mnt

or

mount -t 9p -o trans=virtio host_share /mnt

(the same stuff i tried inside /etc/rc.local)

The only output on a failed mount in rc.local/fstab I get is 

[   15.035920] device: '9p-1': device_add
[   15.038180] 9p: no channels available
[   15.038937] device: '9p-1': device_unregister
[   15.049123] device: '9p-1': device_create_release





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