Re: [PATCH v2 0/6] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC

[Vivek Goyal <vgoyal@redhat.com>]

On Wed, Sep 16, 2020 at 12:17:31PM -0400, Vivek Goyal wrote:
> Hi All,
> 
> Please find attached V2 of the patches to enable SB_NOSEC for fuse. I
> posted V1 here.

I have posted corresonding qemu/virtiofsd change patch here.

https://www.redhat.com/archives/virtio-fs/2020-September/msg00061.html

Thanks
Vivek

> 
> https://lore.kernel.org/linux-fsdevel/20200724183812.19573-1-vgoyal@redhat.com/
> 
> I have generated these patches on top of.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git/log/?h=for-next
> 
> Previously I was not keen on implementing FUSE_HANDLE_KILLPRIV_V2 and
> implemented another idea to enable SB_NOSEC conditional on server
> declaring that filesystem is not shared. But that did not go too
> far when it came to requirements for virtiofs.
> 
> https://lore.kernel.org/linux-fsdevel/20200901204045.1250822-1-vgoyal@redhat.com/
> 
> So I went back to having another look at implementing FUSE_HANDLE_KILLPRIV_V2
> and I think it fits nicely and should work nicely with wide variety of
> use cases.
> 
> I have taken care of feedback from last round. For the case of random
> write peformance has jumped from 50MB/s to 250MB/s. So I am really
> looking forward to these changes so that fuse/virtiofs performance
> can be improved.
> 
> Thanks
> Vivek 
> 
> Vivek Goyal (6):
>   fuse: Introduce the notion of FUSE_HANDLE_KILLPRIV_V2
>   fuse: Set FUSE_WRITE_KILL_PRIV in cached write path
>   fuse: setattr should set FATTR_KILL_PRIV upon size change
>   fuse: Kill suid/sgid using ATTR_MODE if it is not truncate
>   fuse: Add a flag FUSE_OPEN_KILL_PRIV for open() request
>   virtiofs: Support SB_NOSEC flag to improve direct write performance
> 
>  fs/fuse/dir.c             | 19 ++++++++++++++++++-
>  fs/fuse/file.c            |  7 +++++++
>  fs/fuse/fuse_i.h          |  6 ++++++
>  fs/fuse/inode.c           | 17 ++++++++++++++++-
>  include/uapi/linux/fuse.h | 18 +++++++++++++++++-
>  5 files changed, 64 insertions(+), 3 deletions(-)
> 
> -- 
> 2.25.4
>