linux-kernel - Re: [PATCH v2 4/4] ext4: Do not fallback to buffered-io for DIO atomic write

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Message-ID: <875xpbmffw.fsf@gmail.com>
Date: Tue, 29 Oct 2024 14:52:27 +0530
From: Ritesh Harjani (IBM) <ritesh.list@...il.com>
To: John Garry <john.g.garry@...cle.com>, linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>, "Darrick J . Wong" <djwong@...nel.org>, Christoph Hellwig <hch@...radead.org>, Ojaswin Mujoo <ojaswin@...ux.ibm.com>, Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] ext4: Do not fallback to buffered-io for DIO atomic write

John Garry <john.g.garry@...cle.com> writes:

> On 27/10/2024 18:17, Ritesh Harjani (IBM) wrote:
>> iomap can return -ENOTBLK if pagecache invalidation fails.
>> Let's make sure if -ENOTBLK is ever returned for atomic
>> writes than we fail the write request (-EIO) instead of
>> fallback to buffered-io.
>> 
>> Reviewed-by: Darrick J. Wong <djwong@...nel.org>
>> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
>
> I am not sure if you plan on dropping this patch...
>

As discussed in the other thread, EXT4 has got a fallback to buffered-io
logic at certain places including during short DIO writes unlike XFS
which never fallsback to buffered-io in case of short DIO writes.
Let me send another patch for this one.

Thanks for the review. 

-ritesh