[Virtio-fs] [PATCH 0/2] virtiofsd: Two fix for xattr operation

[Stefan Hajnoczi]

On Wed, Oct 16, 2019 at 07:37:52PM +0900, Misono Tomohiro wrote:
> Hello,
> 
> I test xattr operation on virtiofs using xfstest generic/062
> (with -o xattr option and XFS backend) and see some problems.
> 
> These patches fixes the two of the problems.
> 
> The remaining problems are:
>  1. we cannot xattr to block device created by mknod
>     which does not have actual device (since open in virtiofsd fails)
>  2. we cannot xattr to symbolic link
> 
> I don't think 1 is a big problem but can we fix 2?

Sorry, I don't know the answer.  Maybe it would be necessary to add a
new O_SYMLINK open flag to open(2) so that fgetxattr()/fsetxattr()
operations can be performed.  A kernel change like that would take some
time to get accepted upstream and shipped by distros, but it might be
the only way since the current syscall interface doesn't seem to offer a
way to do this.

> 
> Misono Tomohiro (2):
>   virtiofsd: Avoid process hang when doing xattr operation to FIFO
>   virtiofsd: Allow setxattr operation to directry
> 
>  contrib/virtiofsd/passthrough_ll.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> -- 
> 2.21.0
> 
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Reviewed-by: Stefan Hajnoczi <stefanha at redhat.com>
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