linux-kernel - Re: [PATCH 10/41] whiteout: Add vfs_whiteout() and whiteout inode operation

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Message-ID: <20091027212205.GB2132@shell>
Date:	Tue, 27 Oct 2009 17:22:06 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Eric Paris <eparis@...isplace.org>
Cc:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 10/41] whiteout: Add vfs_whiteout() and whiteout inode operation

On Tue, Oct 27, 2009 at 10:36:18AM -0400, Eric Paris wrote:
> On Wed, Oct 21, 2009 at 3:19 PM, Valerie Aurora <vaurora@...hat.com> wrote:
> > From: Jan Blunck <jblunck@...e.de>
> >
> > Simply white-out a given directory entry. This functionality is usually used
> > in the sense of unlink. Therefore the given dentry can still be in-use and
> > contains an in-use inode. The filesystems inode operation has to do what
> > unlink or rmdir would in that case. Since the dentry still might be in-use
> > we have to provide a fresh unhashed dentry that is used as the whiteout
> > dentry instead. The given dentry is dropped and the whiteout dentry is
> > rehashed instead.
> >
> > Signed-off-by: Jan Blunck <jblunck@...e.de>
> > Signed-off-by: David Woodhouse <dwmw2@...radead.org>
> > Signed-off-by: Valerie Aurora <vaurora@...hat.com>
> > ---
> > ?fs/dcache.c ? ? ? ? ? ?| ? ?4 +-
> > ?fs/namei.c ? ? ? ? ? ? | ?104 ++++++++++++++++++++++++++++++++++++++++++++++++
> > ?include/linux/dcache.h | ? ?6 +++
> > ?include/linux/fs.h ? ? | ? ?3 +
> > ?4 files changed, 116 insertions(+), 1 deletions(-)
> >
> 
> > diff --git a/include/linux/dcache.h b/include/linux/dcache.h
> > index 30b93b2..7648b49 100644
> > --- a/include/linux/dcache.h
> > +++ b/include/linux/dcache.h
> > @@ -183,6 +183,7 @@ d_iput: ? ? ? ? ? ? no ? ? ? ? ? ? ?no ? ? ? ? ? ? ?no ? ? ? yes
> > ?#define DCACHE_INOTIFY_PARENT_WATCHED ?0x0020 /* Parent inode is watched by inotify */
> >
> > ?#define DCACHE_COOKIE ? ? ? ? ?0x0040 ?/* For use by dcookie subsystem */
> > +#define DCACHE_WHITEOUT ? ? ? ? ? ? ? ?0x0080 ?/* This negative dentry is a whiteout */
> >
> > ?#define DCACHE_FSNOTIFY_PARENT_WATCHED 0x0080 /* Parent inode is watched by some fsnotify listener */
> >
> 
> I don't think you want 2 flags with the 0x0080 value.......   This
> can't be right.

This looks like a merge error I introduced during a rebase.  Thanks
for catching it!

-VAL
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