linux-kernel - Re: [RFC][PATCH 14/14] tmpfs whiteout support

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Message-ID: <4de7f8a60705141220j2764f326u69545490cdd23c08@mail.gmail.com>
Date:	Mon, 14 May 2007 21:20:53 +0200
From:	"Jan Blunck" <jblunck@...e.de>
To:	"Hugh Dickins" <hugh@...itas.com>
Cc:	"Bharata B Rao" <bharata@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Jan Blunck" <j.blunck@...harburg.de>
Subject: Re: [RFC][PATCH 14/14] tmpfs whiteout support

On 5/14/07, Hugh Dickins <hugh@...itas.com> wrote:
> On Mon, 14 May 2007, Bharata B Rao wrote:
> > From: Jan Blunck <j.blunck@...harburg.de>
> > Subject: tmpfs whiteout support
> >
> > Introduce whiteout support to tmpfs.
> >
> > Signed-off-by: Jan Blunck <j.blunck@...harburg.de>
> > Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> > ---
> >  mm/shmem.c |    9 ++++++++-
> >  1 files changed, 8 insertions(+), 1 deletion(-)
> >
> > --- a/mm/shmem.c
> > +++ b/mm/shmem.c
> > @@ -74,7 +74,7 @@
> >  #define LATENCY_LIMIT         64
> >
> >  /* Pretend that each entry is of this size in directory's i_size */
> > -#define BOGO_DIRENT_SIZE 20
> > +#define BOGO_DIRENT_SIZE 1
>
> Why would that change be needed for whiteout support?
>

Good question. It seems that this a survivor of the changes necessary
for union readdir. This isn't necessary for white-outs.

BTW: Why do we claim this to be 20??? Is there any meaning behind this?

Cheers,
Jan
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