linux-kernel - Re: [PATCH v2] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition

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Message-ID: <x49ehuqbd0p.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 23 Jan 2012 11:27:02 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Niels de Vos <ndevos@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Bryn M. Reeves" <bmr@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [PATCH v2] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition

Niels de Vos <ndevos@...hat.com> writes:

> Executing an fsync() on a file-descriptor of a partition flushes the
> caches for that partition by calling blkdev_issue_flush(). However, it
> seems that reading data through the parent device will still return the
> old cached data.

What problem, exactly, are you trying to fix?  Could you please post a
reproducer?

Cheers,
Jeff
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