linux-ext4 - Re: [Bug 12829] kernel complains on ENOSPC

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Message-ID: <20090407143146.GA29644@skywalker>
Date:	Tue, 7 Apr 2009 20:01:46 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Theodore Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [Bug 12829] kernel complains on ENOSPC

Hi Ted,

No we don't need the patch. The patch is wrong. We are actually taking
into account the allocated blocks in mballoc.c 

3033          */
3034         if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED))
3035                 /* release all the reserved blocks if non delalloc */
3036                 percpu_counter_sub(&sbi->s_dirtyblocks_counter, reserv_blks);
3037         else {
3038                 percpu_counter_sub(&sbi->s_dirtyblocks_counter,
3039							 ac->ac_b_ex.fe_len); 

-aneesh

On Mon, Apr 06, 2009 at 02:58:23PM -0400, Theodore Tso wrote:
> Aneesh,
> 
> What's the status of this patch; do you think we still need it?  If
> so, can you add a proper commit log and signed-off-by, tell me that
> you've tested it, etc.?
> 
> Thanks!!
> 
> 	    	    	  	 - Ted
> 
> 
> On Tue, Mar 10, 2009 at 09:38:24AM -0700, bugme-daemon@...zilla.kernel.org wrote:
> > http://bugzilla.kernel.org/show_bug.cgi?id=12829
> > 
> > 
> > 
> > 
> > 
> > ------- Comment #4 from aneesh.kumar@...ux.vnet.ibm.com  2009-03-10 09:38 -------
> > This patch will not fix the problem. But i guess we need this change
> > 
> > -aneesh
> > 
> > diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> > index 4415bee..671f215 100644
> > --- a/fs/ext4/mballoc.c
> > +++ b/fs/ext4/mballoc.c
> > @@ -4652,11 +4652,11 @@ out1:
> >         if (ar->len < inquota)
> >                 DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
> >  out3:
> > -       if (!ar->len) {
> > +       if (ar->len < reserv_blks) {
> >                 if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
> >                         /* release all the reserved blocks if non delalloc */
> >                         percpu_counter_sub(&sbi->s_dirtyblocks_counter,
> > -                                               reserv_blks);
> > +                                               reserv_blks - ar->len);
> >         }
> > 
> >         trace_mark(ext4_allocate_blocks,
> > 
> > 
> > -- 
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