[Drbd-dev] [PATCH v6 0/8] block: prepare for multipage bvecs

Ming Lei ming.lei at canonical.com
Fri Jun 10 04:44:34 CEST 2016

On Fri, Jun 10, 2016 at 12:06 AM, Jens Axboe <axboe at kernel.dk> wrote:
> On 05/30/2016 07:34 AM, Ming Lei wrote:
>> Hi,
>> 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 and makre BIO_MAX_SIZE as obsolete, 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 BIO_MAX_PAGES.
>> The only functional change is iterate_bvec():lib/iov_iter.c
>> xfstests(-a auto) over loop aio is run for ext4/xfs to verify
>> the change and no regression found with this patchset.
> Added patches 1-7, still waiting for an answer on my reply to #8.

Thanks for adding patches 1-7, and now I just found the added
BIO_MAX_SIZE usage in dm-crypt.c is droped from next, so it is
safe to kill it now.

I will send a new patch #8 against for-4.8/core.


> --
> Jens Axboe
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