linux-ext4 - Re: ENOSPC error returned too late

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Message-Id: <1219077893.8135.0.camel@mingming-laptop>
Date:	Mon, 18 Aug 2008 09:44:53 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Theodore Tso <tytso@....edu>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org
Subject: Re: ENOSPC error returned too late


在 2008-08-18一的 09:30 -0400，Theodore Tso写道：
> On Mon, Aug 18, 2008 at 04:21:40PM +0530, Aneesh Kumar K.V wrote:
> > --- a/fs/ext4/balloc.c
> > +++ b/fs/ext4/balloc.c
> > @@ -1628,6 +1628,9 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> >  		free_blocks =
> >  			percpu_counter_sum_and_set(&sbi->s_freeblocks_counter);
> >  #endif
> > +	if (free_blocks <= root_blocks)
> > +		/* we don't have free space */
> > +		return 0;
> >  	if (free_blocks - root_blocks < nblocks)
> >  		return free_blocks - root_blocks;
> >  	return nblocks;
> 
> Thanks, I'll try it out.  Given that ext4_fsblk_t is an unsigned long
> (BTW, this is one of the reasons why the common coding style guide
> dislikes typedefs; it hides this kind of errors), it's obviously a
> good patch to add regardless of whether it solves are problem, since
> if freeblocks < root_blocks, the following condition is going to do
> the Wrong Thing.
> 

Thanks for catching this Aneesh, agreed.

Signed-off-by: Mingming Cao <cmm@...ibm.com>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> 
> 						- Ted
> 
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