linux-kernel - Re: [PATCH 2/9] ext4: honor the O_SYNC flag for aysnchronous direct I/O requests

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Message-ID: <x49r4nnujx6.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 21 Nov 2012 09:09:41 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	"Darrick J. Wong" <darrick.wong@...cle.com>, axboe@...nel.dk,
	tytso@....edu, david@...morbit.com, bpm@....com,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH 2/9] ext4: honor the O_SYNC flag for aysnchronous direct I/O requests

Jan Kara <jack@...e.cz> writes:

>> Just to be clear, are you saying you would like me to remove the
>> mutex_lock/unlock pair from ext4_sync_file?  (I had already factored out
>> the common code between this new code path and the fsync path in my tree.)
>   Yes, after some thinking I came to that conclusion. We actually need to
> keep i_mutex around ext4_flush_unwritten_io() to avoid livelocks but the
> rest doesn't need it. The change should be definitely a separate patch just
> in case there's something subtle I missed and we need to bisect in
> future... I've attached a patch for that so that blame for bugs goes my way
> ;) Compile tested only so far. I'll give it some more testing overnight.

Great, thanks Jan!  I'll include this in the next posting.

Cheers,
Jeff
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