graphic: 0.965
KVM: 0.963
kernel: 0.885
x86: 0.868
files: 0.855
device: 0.820
architecture: 0.771
vnc: 0.745
PID: 0.736
ppc: 0.735
debug: 0.718
semantic: 0.717
performance: 0.695
virtual: 0.676
hypervisor: 0.666
arm: 0.659
VMM: 0.655
risc-v: 0.625
TCG: 0.595
network: 0.586
user-level: 0.571
register: 0.563
boot: 0.558
i386: 0.535
mistranslation: 0.522
socket: 0.517
peripherals: 0.511
permissions: 0.470
assembly: 0.394

editing the file when mount the file system using 9pfs. it will report fsync failed. 

 I have get a fsync error when I use the 9pfs on the kvm guest. it appears when I use vi editor and sysbench. I have not  found the reason yet. can you tell something about it?  the attache is the picture. and there is no any log which I can provide.

 My qemu version is qemu-kvm-0.13.0, and my  host  linux distributions is 2.6.32-431.el6.x86_64 and the guest vm is the same version which enable 9pfs and 9pnet support. I use the string of "mount -t 9p -o trans=virtio test_mount /tmp/shared/ -oversion=9p2000.L,posixacl" to get the file system.

resovled it, this is because in the kernel 2.6.32; the 9pfs doesn't implement the fsync function. just back port the code from higher version, can resolve it. 

like this patch

https://gitorious.org/linux-gemini/mainline/commit/7a4439c406c21b1e900ed497cec1a79d05b38c07



Closing, as this problem has been resolved according to the last comment.