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

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Message-ID: <7e0fb38c0910270736h13860a3ckf2690a76f99b35be@mail.gmail.com>
Date:	Tue, 27 Oct 2009 10:36:18 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Valerie Aurora <vaurora@...hat.com>
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 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.
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