[PATCH 0/8] block: prepare for multipage bvecs

From: Ming Lei
Date: Tue Mar 22 2016 - 02:13:03 EST


Interests[1] have been shown in multipage bvecs, so this patchset
try to prepare for the support and do two things:

1) the 1st 4 patches use bvec iterator to implement iterate_bvec(),
then we can drop the non-standard way for iterating bvec

2) remove BIO_MAX_SECTORS & BIO_MAX_SIZE, and now there is only
one user for each. Once multipage bvecs is introduced, one bio
may hold lots of sectors, and we should always use sort of BIO_MAX_VECS
which should be introduced in future and is similiar with current

xfstests(-a auto) have been run and no regression found by this
patchset against linus v4.5+.

drivers/block/drbd/drbd_int.h | 4 +--
fs/xfs/xfs_buf.c | 2 +-
include/linux/bio.h | 55 +------------------------------
include/linux/blk_types.h | 4 +--
include/linux/bvec_iter.h | 77 +++++++++++++++++++++++++++++++++++++++++++
lib/iov_iter.c | 31 +++++++----------
6 files changed, 94 insertions(+), 79 deletions(-)

[1], http://marc.info/?w=2&r=1&s=++[LSF%2FMM+ATTEND]+block%3A+multipage+bvecs&q=t