linux-ext4 - Re: [PATCH 1/5] jbd2: Pass extra bool parameter in journal routines to specify if its ok to fail the journal transaction allocation.

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Date:	Mon, 16 May 2011 17:51:38 +0200
From:	Jan Kara <jack@...e.cz>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	Jan Kara <jack@...e.cz>, ext4 <linux-ext4@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 1/5] jbd2: Pass extra bool parameter in journal
 routines to specify if its ok to fail the journal transaction allocation.

  Hello,

On Thu 12-05-11 23:37:05, Manish Katiyar wrote:
> On Wed, May 11, 2011 at 8:54 AM, Jan Kara <jack@...e.cz> wrote:
> >  Hi,
> >
> >  sorry I got to your patches with a delay. One general note - please do
> > not attach patches. It is enough to have them in the email...
> >
> > On Sun 24-04-11 17:10:41, Manish Katiyar wrote:
> >> Pass extra bool parameter in journal routines to specify if its ok to
> >> fail the journal transaction allocation. If 'true' is passed
> >> transaction allocation is done through GFP_KERNEL  and ENOMEM is
> >> returned else GFP_NOFS is used.
> >  Please, do not mix error handling with gfp masks. Instead just rename
> > jbd2__journal_start() to jbd2_journal_start() and change gfp_mask parameter
> > to "bool errok".
> 
> ok.
> 
> > Use GFP_NOFS gfp mask for start_this_handle().
> I think I didn't completely understand this line. You meant passing
> GFP_KERNEL or GFP_NOFS based on errok right ?
  No, I meant passing GFP_NOFS always. Currently, GFP_NOFS is used in all
the cases (noone uses GFP_KERNEL variant) and GFP_KERNEL can really be used
only when we do not hold other filesystem locks (as GFP_KERNEL allocation
can recurse back into filesystem to reclaim memory). So using GFP_KERNEL
would need more auditting and is a separate issue anyway.

> > Also your patch series should be bisectable - that means it must compile
> > and run after any of the patches. So you cannot really change
> > jbd2_journal_start() prototype without changing all the filesystems using
> > it. In this case, just include in this patch a simple change for ext4 and
> > ocfs2 to pass 'false' in the additional argument.
> 
> ok.. Will submit the first patch as everyone passing false as the
> errok argument.
  Thanks.

									Honza

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