linux-kernel - Re: [PATCH V6 08/30] block: introduce chunk_last

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Date:   Tue, 12 Jun 2018 11:24:20 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>,
        David Sterba <dsterba@...e.cz>,
        Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH V6 08/30] block: introduce chunk_last_segment()

On Mon, Jun 11, 2018 at 10:19:38AM -0700, Christoph Hellwig wrote:
> I think both callers would be just as easy to understand by using
> nth_page() instead of these magic helpers.  E.g. for guard_bio_eod:
> 
> 		unsigned offset = (bv.bv_offset + bv.bv_len);
> 		struct page *page = nth_page(bv.bv_page, offset);

The above lines should have been written as:

		struct page *page = nth_page(bv.bv_page, offset / PAGE_SIZE)

but this way may cause 'page' points to the next page of bv's last
page if offset == N * PAGE_SIZE.


Thanks,
Ming