On Mon, Oct 31, 2016 at 08:36:44AM -0700, Christoph Hellwig wrote:
On Sat, Oct 29, 2016 at 04:08:25PM +0800, Ming Lei wrote:
There are lots of direct access to .bi_vcnt & .bi_io_vec
of bio, and it isn't ready to support multipage bvecs
for BTRFS, so set NO_MP for these request queues.
For one bio is an I/O submitter, it has absolutely no business changing
queue flags - if we need to stick to this limitation it simply needs
a version of bio_add_page that doesn't create multi-page bvecs.
Second I don't think making it multipage bvec aware is all that hard,
and we should aim for doing the proper thing.
Yeah, I'd rather make us less special. The direct access was a short
term fix to adjust to the new bio interfaces, we should clean it up.
-chris
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