[Virtio-fs] [PATCH] virtiofsd: Disable remote posix locks by default

[Stefan Hajnoczi]

On Mon, Jul 27, 2020 at 12:18:41PM -0400, Vivek Goyal wrote:
> Right now we enable remote posix locks by default. That means when guest
> does a posix lock it sends request to server (virtiofsd). But currently
> we only support non-blocking posix lock and return -EOPNOTSUPP for
> blocking version.
> 
> This means that existing applications which are doing blocking posix
> locks get -EOPNOTSUPP and fail. To avoid this, people have been
> running virtiosd with option "-o no_posix_lock". For new users it
> is still a surprise and trial and error takes them to this option.
> 
> Given posix lock implementation is not complete in virtiofsd, disable
> it by default. This means that posix locks will work with-in applications
> in a guest but not across guests. Anyway we don't support sharing
> filesystem among different guests yet in virtiofs so this should
> not lead to any kind of surprise or regression and will make life
> little easier for virtiofs users.
> 
> Reported-by: Aa Aa <jimbothom at yandex.com>
> Suggested-by: Miklos Szeredi <mszeredi at redhat.com>
> Signed-off-by: Vivek Goyal <vgoyal at redhat.com>
> ---
>  tools/virtiofsd/passthrough_ll.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha at redhat.com>
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