linux-ext4 - Re: [PATCH 2/2] ext3: Add FITRIM handle for ext3

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Date:	Wed, 24 Nov 2010 17:32:08 +0100
From:	Jan Kara <jack@...e.cz>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, tytso@....edu,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] ext3: Add FITRIM handle for ext3

On Wed 24-11-10 15:32:59, Lukas Czerner wrote:
> On Wed, 24 Nov 2010, Jan Kara wrote:
> > On Tue 23-11-10 11:32:46, Lukas Czerner wrote:
> > > On Mon, 22 Nov 2010, Jan Kara wrote:
> > > 
> > > > On Mon 22-11-10 12:29:18, Lukas Czerner wrote:
> > > > > It takes fstrim_range structure as an argument. fstrim_range is definec in
> > > > > the include/linux/fs.h.
> > > > > 
> > > > > After the FITRIM is done, the number of actually discarded Bytes is stored
> > > > > in fstrim_range.len to give the user better insight on how much storage
> > > > > space has been really released for wear-leveling.
> > > >   Umm, why do we have to do this when FITRIM is already handled in
> > > > fs/ioctl.c? I'd expect us to just provide .trim_fs ioctl, no?
> > > 
> > > Hi,
> > > 
> > > see upstream commits:
> > > 93bb41f4f8b89ac8b4d0a734bc59634cb0a29a89
> > > e681c047e47c0abe67bf95857f23814372793cb0
> > > 
> > > unfortunately people was not happy with generic ioctl interface for that
> > > purpose, there were concerned that it is no common enough to be included
> > > in core vfs and there is no need for new super operation since each
> > > filesystem can easily setup its own ioctl handling.
> > > 
> > > When I say people I need to clarify that it was mainly Christoph Hellwig
> > > who had objections against the former implementation and I must say that
> > > he had a point.
> > OK, I see. I had a fresh look at the patches and I've found a few
> > suboptimal things which I've fixed. Most notably I don't think we have to
> > issue a warning when underlying device does not support FITRIM. Returning
> > EOPNOTSUPP should be enough. And I also think that remounting the
> > filesystem read-only or even panicking (the result of calling
> > ext3_std_error()) is necessary when sb_issue_discard() fails for whatever
> 
> Did you meant "is NOT necessary" ? Just for clarification.
  Yes.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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