Andreas Gruenbacher 6603584106 UPSTREAM: iov_iter: Introduce fault_in_iov_iter_writeable ...

commit cdd591fc86e38ad3899196066219fbbd845f3162 upstream

Introduce a new fault_in_iov_iter_writeable helper for safely faulting
in an iterator for writing.  Uses get_user_pages() to fault in the pages
without actually writing to them, which would be destructive.

We'll use fault_in_iov_iter_writeable in gfs2 once we've determined that
the iterator passed to .read_iter isn't in memory.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 1d91c912e7)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I4c9027acdfe20703b210ca1f49de39d46813fb64

2022-06-10 08:12:03 +02:00

30 KiB

Raw Blame History

View Raw