In message <1256152779-10054-16-git-send-email-vaurora@xxxxxxxxxx>, Valerie Aurora writes:
> From: Jan Blunck <jblunck@xxxxxxx>
>
> This patch adds whiteout support to EXT2. A whiteout is an empty directory
> entry (inode == 0) with the file type set to EXT2_FT_WHT. Therefore it
> allocates space in directories. Due to being implemented as a filetype it is
> necessary to have the EXT2_FEATURE_INCOMPAT_FILETYPE flag set.
>
> XXX - Whiteouts could be implemented as special symbolic links
>
> Signed-off-by: Jan Blunck <jblunck@xxxxxxx>
> Signed-off-by: Valerie Aurora <vaurora@xxxxxxxxxx>
> Cc: Theodore Tso <tytso@xxxxxxx>
> Cc: linux-ext4@xxxxxxxxxxxxxxx
> ---
> fs/ext2/dir.c | 96 +++++++++++++++++++++++++++++++++++++++++++++--
> fs/ext2/ext2.h | 3 +
> fs/ext2/inode.c | 11 ++++-
> fs/ext2/namei.c | 65 ++++++++++++++++++++++++++++++-
> fs/ext2/super.c | 7 +++
> include/linux/ext2_fs.h | 4 ++
> 6 files changed, 176 insertions(+), 10 deletions(-)
>
> diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
> index cb8ceff..d4628c0 100644
> --- a/fs/ext2/dir.c
> +++ b/fs/ext2/dir.c
> @@ -219,7 +219,7 @@ static inline int ext2_match (int len, const char * const name,
> {
> if (len != de->name_len)
> return 0;
> - if (!de->inode)
> + if (!de->inode && (de->file_type != EXT2_FT_WHT))
The extra parens around (de->file_type != EXT2_FT_WHT) don't hurt but are
unnecessary. Ditto in a couple of other places in this patch.
Erez.
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