linux-kernel - Re: [PATCH v21 0/6] block: Use page pinning

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Message-Id: <168487791137.449781.3170440352656135902.b4-ty@kernel.dk>
Date:   Tue, 23 May 2023 15:38:31 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>
Cc:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH v21 0/6] block: Use page pinning


On Mon, 22 May 2023 21:57:38 +0100, David Howells wrote:
> This patchset rolls page-pinning out to the bio struct and the block layer,
> using iov_iter_extract_pages() to get pages and noting with BIO_PAGE_PINNED
> if the data pages attached to a bio are pinned.  If the data pages come
> from a non-user-backed iterator, then the pages are left unpinned and
> unref'd, relying on whoever set up the I/O to do the retaining.
> 
> This requires the splice-read patchset to have been applied first,
> otherwise reversion of the ITER_PAGE iterator can race with truncate and
> return pages to the allocator whilst they're still undergoing DMA[2].
> 
> [...]

Applied, thanks!

[1/6] iomap: Don't get an reference on ZERO_PAGE for direct I/O block zeroing
      commit: 9e73bb36b189ec73c7062ec974e0ff287c1aa152
[2/6] block: Fix bio_flagged() so that gcc can better optimise it
      commit: b9cc607a7f722c374540b2a7c973382592196549
[3/6] block: Replace BIO_NO_PAGE_REF with BIO_PAGE_REFFED with inverted logic
      commit: 100ae68dac60a0688082dcaf3e436606ec0fd51f
[4/6] block: Add BIO_PAGE_PINNED and associated infrastructure
      commit: 84d9fe8b7ea6a53fd93506583ff33a408f95ac60
[5/6] block: Convert bio_iov_iter_get_pages to use iov_iter_extract_pages
      commit: b7c96963925fe08d4ef175b7d438c0017155807c
[6/6] block: convert bio_map_user_iov to use iov_iter_extract_pages
      commit: 36b61bb07963b13de4cc03a945aa25b9ffc7d003

Best regards,
-- 
Jens Axboe