linux-kernel - Re: [PATCH] ext4: add error handling when discard cmd is fail in FITRIM

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Date:	Mon, 30 Jul 2012 19:21:13 +0530
From:	Ashish Sangwan <ashishsangwan2@...il.com>
To:	Lukáš Czerner <lczerner@...hat.com>
Cc:	Namjae Jeon <linkinjeon@...il.com>, tytso@....edu,
	sandeen@...hat.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Amit Sahrawat <amit.sahrawat83@...il.com>
Subject: Re: [PATCH] ext4: add error handling when discard cmd is fail in FITRIM

On Mon, Jul 30, 2012 at 5:01 PM, Lukáš Czerner <lczerner@...hat.com> wrote:
> On Sun, 29 Jul 2012, Namjae Jeon wrote:
>
>> Date: Sun, 29 Jul 2012 07:31:54 -0400
>> From: Namjae Jeon <linkinjeon@...il.com>
>> To: tytso@....edu, sandeen@...hat.com, lczerner@...hat.com,
>>     linux-ext4@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>,
>>     Amit Sahrawat <amit.sahrawat83@...il.com>
>> Subject: [PATCH] ext4: add error handling when discard cmd is fail in FITRIM
>>
>> Although free extents is proper not trimmed(mmc driver return error code
>> while sending trim command), currently FITRIM ioctl return success.
>> Add exception routine to inform user error code.
>>
>> #> ./fitrim_test
>> end_request: I/O error, dev mmcblk0, sector 27232
>> EXT4-fs warning (device mmcblk0): ext4_trim_all_free:4857:
>> Discard command returned error -5
>> #>
>
> Well, by this change you're actually reverting commit
>
> d9f34504e6952e909a6932c5b2d1857716606380
>          ext4: ignore errors when issuing discards
>
> which effectively reverts a30eec2a8.
>
> Now I think that the way it is now is actually better than your
> proposal for the reasons mentioned in the commit
> d9f34504e6952e909a6932c5b2d1857716606380. However I think that the

How about instead of propagating the error to user and breaking out of
the discard, just print a warning message like:
ext4_warning(sb, "error %d while trimming group block from %d to
%d\n",ret, start, next);

> discard errors should be logged nevertheless but not at the file
> system level, but rather on block layer level if it is not done
> already.
>
> Thanks!
> -Lukas
>
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