[CRIU] [PATCH] fsnotify: Use longest mount point for inotify watchee

[Cyrill Gorcunov]

On Mon, Oct 12, 2015 at 11:16:50AM +0300, Pavel Emelyanov wrote:
> 
> But we do know the namespace the path come from, why do we ever
> _guess_ anything instead of just going to that ns and opening
> the file there?

Because the @mnt_id we are obtaining with file handle points
to the first matching @sdev (which obviously may point to any
mountnamespace). In turn on restore when we're adding watchee
we're already in mount namespace of the process, and the @path
we saved earlier is overmounted with something else. That said
I guess that we might transfer file descriptors or switching
to target mount namespace when opening paths but this makes
code even more complex. This solution looks way more easier.