linux-kernel - Re: [PATCH v4 0/3] block: Make old dio use iov_iter_extract

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Date:   Wed, 31 May 2023 09:48:33 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        David Howells <dhowells@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        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 v4 0/3] block: Make old dio use
 iov_iter_extract_pages() and page pinning


On Fri, 26 May 2023 22:41:39 +0100, David Howells wrote:
> Here are three patches that go on top of the similar patches for bio
> structs now in the block tree that make the old block direct-IO code use
> iov_iter_extract_pages() and page pinning.
> 
> There are three patches:
> 
>  (1) Make page pinning neither add nor remove a pin to/from a ZERO_PAGE,
>      thereby allowing the dio code to insert zero pages in the middle of
>      dealing with pinned pages.  This also mitigates a potential problem
>      whereby userspace could force the overrun the pin counter of a zero
>      page.
> 
> [...]

Applied, thanks!

[1/3] mm: Don't pin ZERO_PAGE in pin_user_pages()
      commit: c8070b78751955e59b42457b974bea4a4fe00187
[2/3] mm: Provide a function to get an additional pin on a page
      commit: 1101fb8f89e5fc548c4d0ad66750e98980291815
[3/3] block: Use iov_iter_extract_pages() and page pinning in direct-io.c
      commit: 1ccf164ec866cb8575ab9b2e219fca875089c60e

Best regards,
-- 
Jens Axboe