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Re: your patch "mm: Remove false WARN_ON from pagecache_isize_extended()

To: "Dave Chinner" <david@xxxxxxxxxxxxx>
Subject: Re: your patch "mm: Remove false WARN_ON from pagecache_isize_extended()"
From: "Jan Beulich" <JBeulich@xxxxxxxx>
Date: Tue, 04 Nov 2014 07:40:20 +0000
Cc: <xfs@xxxxxxxxxxx>,"Jan Kara" <jack@xxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20141103221849.GB23575@dastard>
References: <5457BE390200007800044838@xxxxxxxxxxxxxxxxxxxx> <20141103221849.GB23575@dastard>
>>> On 03.11.14 at 23:18, <david@xxxxxxxxxxxxx> wrote:
> On Mon, Nov 03, 2014 at 04:41:13PM +0000, Jan Beulich wrote:
>> having run into that warning too, I looked into it a little, and now
>> having found that patch am pretty uncertain: Both truncate_setsize()
>> and pagecache_isize_extended() document that they want to be
>> called with i_mutex held, so removing the WARN_ON() alone seems
>> either incomplete or wrong. What I found to work without violating
>> this documented requirement is the patch below.
> Or, just perhaps, the comments are wrong....

Right - that's what I was suggesting with the option of the patch
being incomplete (rather than just removing the WARN_ON() it
should also remove the respective comments then).


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