linux-kernel - Re: [RFC PATCH] block: all callers should check blkdev_issue

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Message-ID: <x498vfarsuh.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 26 Jun 2012 11:33:10 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, tj@...nel.org, hch@...radead.org,
	vgoyal@...hat.com, dm-devel@...hat.com
Subject: Re: [RFC PATCH] block: all callers should check blkdev_issue_flush's return

Mike Snitzer <snitzer@...hat.com> writes:

> It is concerning that a FLUSH may fail but the blkdev_issue_flush
> callers assume it will always succeed.
>
> Each blkdev_issue_flush caller should come to terms with the reality
> that a FLUSH may fail -- the file_operations' .fsync methods in
> particular.  nilfs2 is the only filesystem that checks
> blkdev_issue_flush's return.

Yeah, as it stands, it looks like in many cases fsync won't return an
error if a flush fails.  That's bad.
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