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iov_iter: Introduce fault_in_iov_iter_writeable
authorAndreas Gruenbacher <agruenba@redhat.com>
Mon, 5 Jul 2021 15:26:28 +0000 (17:26 +0200)
committerAndreas Gruenbacher <agruenba@redhat.com>
Wed, 20 Oct 2021 17:33:07 +0000 (19:33 +0200)
commit5ac694a073d1b3486fb8740d73f2505150049175
tree6fa9b67d1df07be3b57ba43a66120c0c4fd63450tree | snapshot
parentcab36e701dc6684828bfd49b3e8735a7b1f6791ecommit | diff
iov_iter: Introduce fault_in_iov_iter_writeable

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>
include/linux/pagemap.h diff | blob | history
include/linux/uio.h diff | blob | history
lib/iov_iter.c diff | blob | history
mm/gup.c diff | blob | history
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