Public bug reported:
I have a KVM host and a guest (VM), both with Ubuntu 14,04
I want to mount a filesystem from the host by the VM via 9p.
When using the setup described in
http://www.linux-kvm.org/page/9p_virtio
I can mount the host directory:
root@flupp:/# mount | grep /spool_
/spool_mapped on /spool_mapped type 9p (rw,trans=virtio,version=9p2000.L)
/spool_passthrough on /spool_passthrough type 9p
(rw,trans=virtio,version=9p2000.L)
/spool_squash on /spool_squash type 9p (rw,trans=virtio,version=9p2000.L)
but when I try to access files I get errors:
root@flupp:/# ls -ld /spool_*/xx*
ls: cannot read symbolic link /spool_mapped/xx2: Too many levels of symbolic
links
drwx------ 1 fex fex 4 May 28 18:28 /spool_mapped/xx1
lrwxrwxrwx 1 fex fex 3 May 28 13:56 /spool_mapped/xx2
drwx------ 1 fex fex 4 May 28 18:28 /spool_passthrough/xx1
lrwxrwxrwx 1 fex fex 3 May 28 13:56 /spool_passthrough/xx2 -> xx1
drwx------ 1 fex fex 4 May 28 18:28 /spool_squash/xx1
lrwxrwxrwx 1 fex fex 3 May 28 13:56 /spool_squash/xx2 -> xx1
root@flupp:/# ls -l /spool_*/xx1
ls: cannot open directory /spool_mapped/xx1: Permission denied
ls: cannot open directory /spool_passthrough/xx1: Permission denied
ls: cannot open directory /spool_squash/xx1: Permission denied
root@flupp:/# id
uid=0(root) gid=0(root) groups=0(root)
When I use nfs instead of 9p everything looks ok:
root@flupp:/# mount | grep spool.*nfs
kvmhost:/data/fex/spool on /spool type nfs
(rw,relatime,nfsvers=3,proto=udp,addr=192.168.254.1)
root@flupp:/spool# ls -ld /spool/xx1/*
-rw------- 1 fex fex 77096 May 28 13:56 /spool/xx1/xx
root@flupp:/spool# wc /spool/xx1/xx
1252 6264 77096 /spool/xx1/xx
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1460629
Title:
no access with 9p qemu-kvm filesystem
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