Re: [PATCH] fuse: Add filesystem attribute in sysfs control dir.

[lepton <ytht.net@gmail.com>]

On Mon, Aug 22, 2022 at 6:37 AM Miklos Szeredi <miklos@szeredi.hu> wrote:
>
> On Wed, 29 Jul 2020 at 01:45, Lepton Wu <ytht.net@gmail.com> wrote:
> >
> > With this, user space can have more control to just abort some kind of
> > fuse connections. Currently, in Android, it will write to abort file
> > to abort all fuse connections while in some cases, we'd like to keep
> > some fuse connections. This can help that.
>
> You can grep the same info from /proc/self/mountinfo.  Why does that not work?
Hi Miklos, thanks for this hint. That will work. But the code in user
space will be more complicated and not straightforward.
For now, I can see 2 issues with mountinfo:
1.  one connection could have multiple entries under
/proc/self/mountinfo if there are bind mounts,  user space code needs
to handle that.
2.  /proc/self/mountinfo is limited by namespace, so in theory, some
connection under /sys/fs/fuse/connections  could be missed in it.
While this isn't an issue
for the current android code, maybe it could get broken in the future.

Overall, I am feeling my kernel patch is a straightforward and simple
solution and it's just one more attribute under
/sys/fs/fuse/connections, may I know if there are any downsides to
doing this?

Thanks!
>
> Thanks,
> Miklos