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From: Dave Chinner <david@fromorbit.com>
To: David Howells <dhowells@redhat.com>
Cc: willy@infradead.org, hch@lst.de, trond.myklebust@primarydata.com,
	"Darrick J. Wong" <djwong@kernel.org>,
	linux-xfs@vger.kernel.org, linux-block@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	darrick.wong@oracle.com, viro@zeniv.linux.org.uk,
	jlayton@kernel.org, torvalds@linux-foundation.org,
	linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 4/9] Introduce IOCB_SWAP kiocb flag to trigger REQ_SWAP
Date: Mon, 27 Sep 2021 07:56:33 +1000	[thread overview]
Message-ID: <20210926215633.GG2361455@dread.disaster.area> (raw)
In-Reply-To: <163250391274.2330363.16176856646027970865.stgit@warthog.procyon.org.uk>

On Fri, Sep 24, 2021 at 06:18:32PM +0100, David Howells wrote:
> Introduce an IOCB_SWAP flag for the kiocb struct such that the REQ_SWAP
> will get set on lower level operation structures in generic code.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Matthew Wilcox <willy@infradead.org>
> cc: Christoph Hellwig <hch@lst.de>
> cc: Darrick J. Wong <djwong@kernel.org>
> cc: linux-xfs@vger.kernel.org
> cc: linux-block@vger.kernel.org
> cc: linux-fsdevel@vger.kernel.org
> cc: linux-mm@kvack.org
> ---
> 
>  fs/direct-io.c      |    2 ++
>  include/linux/bio.h |    2 ++
>  include/linux/fs.h  |    1 +
>  3 files changed, 5 insertions(+)
> 
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index b2e86e739d7a..76eec0a68fa4 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -1216,6 +1216,8 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
>  	}
>  	if (iocb->ki_flags & IOCB_HIPRI)
>  		dio->op_flags |= REQ_HIPRI;
> +	if (iocb->ki_flags & IOCB_SWAP)
> +		dio->op_flags |= REQ_SWAP;
>  
>  	/*
>  	 * For AIO O_(D)SYNC writes we need to defer completions to a workqueue
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 00952e92eae1..b01133727494 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -787,6 +787,8 @@ static inline void bio_set_polled(struct bio *bio, struct kiocb *kiocb)
>  	bio->bi_opf |= REQ_HIPRI;
>  	if (!is_sync_kiocb(kiocb))
>  		bio->bi_opf |= REQ_NOWAIT;
> +	if (kiocb->ki_flags & IOCB_SWAP)
> +		bio->bi_opf |= REQ_SWAP;
>  }
>  
>  struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index c909ca6c0eb6..c20f4423e2f1 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -321,6 +321,7 @@ enum rw_hint {
>  #define IOCB_NOIO		(1 << 20)
>  /* can use bio alloc cache */
>  #define IOCB_ALLOC_CACHE	(1 << 21)
> +#define IOCB_SWAP		(1 << 22)	/* Operation on a swapfile */
>  
>  struct kiocb {
>  	struct file		*ki_filp;

This doesn't set REQ_SWAP for the iomap based DIO path.
bio_set_polled() is only called from iomap for IOCB_HIPRI IO.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

  reply	other threads:[~2021-09-26 21:56 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 17:17 [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles David Howells
2021-09-24 17:18 ` [PATCH v3 1/9] mm: Remove the callback func argument from __swap_writepage() David Howells
2021-09-24 17:18 ` [PATCH v3 2/9] mm: Add 'supports' field to the address_space_operations to list features David Howells
2021-09-24 20:10   ` Matthew Wilcox
2021-09-24 17:18 ` [PATCH v3 3/9] mm: Make swap_readpage() void David Howells
2021-09-24 22:07   ` Matthew Wilcox
2021-09-24 17:18 ` [PATCH v3 4/9] Introduce IOCB_SWAP kiocb flag to trigger REQ_SWAP David Howells
2021-09-26 21:56   ` Dave Chinner [this message]
2021-09-24 17:18 ` [PATCH v3 5/9] mm: Make swap_readpage() for SWP_FS_OPS use ->swap_rw() not ->readpage() David Howells
2021-09-24 17:18 ` [PATCH v3 6/9] mm: Make __swap_writepage() do async DIO if asked for it David Howells
2021-09-24 17:19 ` [PATCH v3 7/9] nfs: Fix write to swapfile failure due to generic_write_checks() David Howells
2021-09-24 17:19 ` [PATCH v3 8/9] block, btrfs, ext4, xfs: Implement swap_rw David Howells
2021-09-24 17:19 ` [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths David Howells
2021-09-25 14:56   ` Matthew Wilcox
2021-09-25 15:36   ` David Howells
2021-09-25 17:09     ` Matthew Wilcox
2021-09-26 23:08       ` Damien Le Moal
2021-09-27  1:25         ` Dave Chinner
2021-09-27  1:41           ` Damien Le Moal
2021-09-27 20:03     ` David Sterba
2021-09-25 23:42 ` [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles Dave Chinner
2021-09-26  3:10   ` Matthew Wilcox
2021-09-26 22:36     ` Dave Chinner
2021-09-27 20:07 ` David Sterba
2021-09-28  3:11 ` NeilBrown
2021-09-30 15:54   ` Steve French
2021-09-30 15:54     ` Steve French
2021-09-29 15:45 ` David Howells

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