linux-ext4 - Re: [PATCH 1/6] fs: add hole punching to fallocate

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Message-ID: <20101116114346.GB4757@quack.suse.cz>
Date:	Tue, 16 Nov 2010 12:43:46 +0100
From:	Jan Kara <jack@...e.cz>
To:	Josef Bacik <josef@...hat.com>
Cc:	david@...morbit.com, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com, cmm@...ibm.com,
	cluster-devel@...hat.com, ocfs2-devel@....oracle.com
Subject: Re: [PATCH 1/6] fs: add hole punching to fallocate

On Tue 16-11-10 12:16:11, Jan Kara wrote:
> On Mon 15-11-10 12:05:18, Josef Bacik wrote:
> > diff --git a/fs/open.c b/fs/open.c
> > index 4197b9e..ab8dedf 100644
> > --- a/fs/open.c
> > +++ b/fs/open.c
> > @@ -223,7 +223,7 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
> >  		return -EINVAL;
> >  
> >  	/* Return error if mode is not supported */
> > -	if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
> > +	if (mode && (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)))
>   Why not just:
> if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) ?
  And BTW, since FALLOC_FL_PUNCH_HOLE does not change the file size, should
not we enforce that FALLOC_FL_KEEP_SIZE is / is not set? I don't mind too
much which way but keeping it ambiguous (ignored) in the interface usually
proves as a bad idea in future when we want to further extend the interface...

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