tree 319206f280d9b57c45dfa2a42e869b25270611f4
parent 875f1d0769cdcfe1596ff0ca609b453359e42ec9
author Jens Axboe <axboe@kernel.dk> 1551298403 -0700
committer Jens Axboe <axboe@kernel.dk> 1552927488 -0600

block: add BIO_NO_PAGE_REF flag

If bio_iov_iter_get_pages() is called on an iov_iter that is flagged
with NO_REF, then we don't need to add a page reference for the pages
that we add.

Add BIO_NO_PAGE_REF to track this in the bio, so IO completion knows
not to drop a reference to these pages.

Signed-off-by: Jens Axboe <axboe@kernel.dk>