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From: David Howells <dhowells@redhat.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: dhowells@redhat.com, trond.myklebust@primarydata.com,
	darrick.wong@oracle.com, hch@lst.de, jlayton@kernel.org,
	sfrench@samba.org, torvalds@linux-foundation.org,
	linux-nfs@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] mm: Make swap_readpage() for SWP_FS_OPS use ->direct_IO() not ->readpage()
Date: Thu, 12 Aug 2021 15:16:31 +0100	[thread overview]
Message-ID: <3122384.1628777791@warthog.procyon.org.uk> (raw)
In-Reply-To: <YRUnN+Y2CQ0qcjO6@casper.infradead.org>

Matthew Wilcox <willy@infradead.org> wrote:

> This is a read, not a write ... but we don't care about ki_pos being
> updated, so that store can be conditioned on IOCB_SWAP being clear.
> Or instead of storing directly to ki_pos, we take a pointer to ki_pos
> and then redirect that pointer somewhere harmless.

But see also ext4_dio_read_iter(), for example.  That touches ki_filp after
starting the op.

David


  parent reply	other threads:[~2021-08-12 14:16 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-12 11:57 [PATCH 0/2] mm: Fix NFS swapfiles and use DIO read for swapfiles David Howells
2021-08-12 11:57 ` [PATCH 1/2] nfs: Fix write to swapfile failure due to generic_write_checks() David Howells
2021-08-12 11:57 ` [PATCH 2/2] mm: Make swap_readpage() for SWP_FS_OPS use ->direct_IO() not ->readpage() David Howells
2021-08-12 12:21   ` Christoph Hellwig
2021-08-12 12:57   ` David Howells
2021-08-12 15:39     ` Matthew Wilcox
2021-08-12 17:02       ` Christoph Hellwig
2021-08-12 17:48         ` Darrick J. Wong
2021-08-12 18:14           ` Matthew Wilcox
2021-08-12 20:13             ` Theodore Ts'o
2021-08-13  6:54           ` Christoph Hellwig
2021-08-12 13:00   ` Matthew Wilcox
2021-08-12 13:23   ` David Howells
2021-08-12 13:37   ` David Howells
2021-08-12 13:50     ` Matthew Wilcox
2021-08-12 14:16     ` David Howells [this message]
2021-08-12 12:18 ` [PATCH 0/2] mm: Fix NFS swapfiles and use DIO read for swapfiles Christoph Hellwig

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