On Wed, Feb 03, 2021 at 03:41:56PM +0300, Pavel Tikhomirov wrote: > Currently there is no way to differentiate the file with alive owner > from the file with dead owner but pid of the owner reused. That's why > CRIU can't actually know if it needs to restore file owner or not, > because if it restores owner but actual owner was dead, this can > introduce unexpected signals to the "false"-owner (which reused the > pid). > > Let's change the api, so that F_GETOWN(EX) returns 0 in case actual > owner is dead already. > > Cc: Jeff Layton <jlayton@xxxxxxxxxx> > Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx> > Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> > Cc: linux-fsdevel@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxx> > Cc: Andrei Vagin <avagin@xxxxxxxxx> > Signed-off-by: Pavel Tikhomirov <ptikhomirov@xxxxxxxxxxxxx> I can't imagine a scenario where we could break some backward compatibility with this change, so Reviewed-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
