Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

[Al Viro]

On Fri, Mar 06, 2020 at 05:25:49PM +0100, Miklos Szeredi wrote:
> On Tue, Mar 03, 2020 at 08:46:09AM +0100, Miklos Szeredi wrote:
> > 
> > I'm doing a patch.   Let's see how it fares in the face of all these
> > preconceptions.
> 
> Here's a first cut.  Doesn't yet have superblock info, just mount info.
> Probably has rough edges, but appears to work.

For starters, you have just made namespace_sem held over copy_to_user().
This is not going to fly.