linux-kernel - Re: fs: page cache wrongly left invalidated after revalidate

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Message-ID: <x491ugo6l3c.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 24 Oct 2012 09:44:23 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	MITSUNARI Shigeo <herumi@...ty.com>
Cc:	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: Re: fs: page cache wrongly left invalidated after revalidate_disk

MITSUNARI Shigeo <herumi@...ty.com> writes:

> Hi, 
>
> We found that bdev->bd_invalidated was left set once revalidate_disk() 
> is called, which results in page cache flush every time that device 
> is open. 
>
> Specifically, we found this problem in MD block device.  Once we 
> resize a MD device, mdadm --monitor periodically flush all page cache 
> for that device every 60 or 1000 seconds when it opens the device. 
>
> This bug lies since at least 3.2.0 till the latest kernel(3.6.2). 
> Patch is attached. 
>
> Anyone please review this?  Thanks in advance.

rescan_partitions (called in the bdev open path) should reset
bd_invalidated.  I think you need to dig into why that isn't happening.

Cheers,
Jeff
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