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From: Dave Chinner <david@fromorbit.com>
To: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: darrick.wong@oracle.com, linux-btrfs@vger.kernel.org,
	fdmanana@gmail.com, linux-fsdevel@vger.kernel.org, hch@lst.de,
	linux-xfs@vger.kernel.org
Subject: Re: [PATCH 0/3] Transient errors in Direct I/O
Date: Wed, 10 Jun 2020 12:59:00 +1000	[thread overview]
Message-ID: <20200610025900.GA2005@dread.disaster.area> (raw)
In-Reply-To: <20200605204838.10765-1-rgoldwyn@suse.de>

[ Please cc the XFS list on XFS and iomap infrastructure changes.]

On Fri, Jun 05, 2020 at 03:48:35PM -0500, Goldwyn Rodrigues wrote:
> In current scenarios, for XFS, it would mean that a page invalidation
> would end up being a writeback error. So, if iomap returns zero, fall
> back to biffered I/O. XFS has never supported fallback to buffered I/O.
> I hope it is not "never will" ;)

I wouldn't say "never", but we are not going to change XFS behaviour
because btrfs has a page invalidation vs DIO bug in it...

If you want to make a specific filesystem fall back to buffered IO
in this case, pass a new flag into iomap_dio_rw() to conditionally
abort the DIO on invalidation failure and let filesystem
implementations opt-in to use that flag.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

  parent reply	other threads:[~2020-06-10  2:59 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-05 20:48 Goldwyn Rodrigues
2020-06-05 20:48 ` [PATCH 1/3] iomap: dio Return zero in case of unsuccessful pagecache invalidation Goldwyn Rodrigues
2020-06-06  3:13   ` Matthew Wilcox
2020-06-05 20:48 ` [PATCH 2/3] btrfs: Wait for extent bits to release page Goldwyn Rodrigues
2020-06-08 10:20   ` Filipe Manana
2020-06-08 12:13     ` Goldwyn Rodrigues
2020-06-05 20:48 ` [PATCH 3/3] xfs: fallback to buffered I/O if direct I/O is short Goldwyn Rodrigues
2020-06-10  2:59 ` Dave Chinner [this message]
2020-06-10  5:05   ` [PATCH 0/3] Transient errors in Direct I/O Dave Chinner
2020-06-11 14:13     ` Goldwyn Rodrigues
2020-06-10  5:31 ` Qu Wenruo
2020-06-11 14:11   ` Goldwyn Rodrigues
2020-06-12 12:56     ` Qu Wenruo

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