Re: [PATCH v1 02/14] block: introduce bio_remove_last_page()

[PATCH v1 00/14] md: cleanup on direct access to bvec table · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 14/14] md: raid10: avoid direct access to bvec table in handle_reshape_read_error · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 13/14] md: raid10: retrieve page from preallocated resync page array · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 12/14] md: raid10: don't use bio's vec table to manage resync pages · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 11/14] md: raid10: refactor code of read reshape's .bi_end_io · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 10/14] md: raid1: use bio_segments_all() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 07/14] md: raid1: don't use bio's vec table to manage resync pages · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 09/14] md: raid1: use bio helper in process_checks() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 08/14] md: raid1: retrieve page from pre-allocated resync page array · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 05/14] md: prepare for managing resync I/O pages in clean way · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 06/14] md: raid1: simplify r1buf_pool_free() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 04/14] md: move two macros into md.h · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 02/14] block: introduce bio_remove_last_page() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
Re: [PATCH v1 02/14] block: introduce bio_remove_last_page() · Christoph Hellwig <hch@infradead.org> · 2017-02-25
Re: [PATCH v1 02/14] block: introduce bio_remove_last_page() · Ming Lei <tom.leiming@gmail.com> · 2017-02-28
[PATCH v1 03/14] md: raid1/raid10: use bio_remove_last_page() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
[PATCH v1 01/14] block: introduce bio_segments_all() · Ming Lei <tom.leiming@gmail.com> · 2017-02-24
Re: [PATCH v1 01/14] block: introduce bio_segments_all() · Christoph Hellwig <hch@infradead.org> · 2017-02-25
Re: [PATCH v1 01/14] block: introduce bio_segments_all() · Ming Lei <tom.leiming@gmail.com> · 2017-02-28

From: Christoph Hellwig <hch@infradead.org>
Date: 2017-02-25 18:23:10
Also in: linux-block, lkml

On Fri, Feb 24, 2017 at 11:42:39PM +0800, Ming Lei wrote:

MD need this helper to remove the last added page, so introduce
it.

If MD really has a valid use case for this it should open code the
operation.  The semantics look deeply fishy to me.

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