[PATCH v1 0/8] block: prepare for multipage bvecs

From: Ming Lei
Date: Wed Mar 30 2016 - 12:17:34 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, which
can be thought as a good cleanup for lib/iov_iter.c

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 v4.6-rc1-next-20160329.

- don't move BIO_MAX_* to bvec_iter.h as pointed out by Christoph
- run xfstests against v4.6-rc1-next-20160329
- add Reviewed-by
- for 1,4 and 5, Reviewd-by not added, Christoph still expressed
'this looks fine to me.'

drivers/block/drbd/drbd_int.h | 4 ++--
fs/xfs/xfs_buf.c | 4 +---
include/linux/bio.h | 53 +----------------------------------------
include/linux/blk_types.h | 4 ++--
include/linux/bvec_iter.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
lib/iov_iter.c | 31 +++++++++---------------
6 files changed, 92 insertions(+), 79 deletions(-)