From: Miklos Szeredi <mszeredi@suse.cz>
Date: Thu, 23 Oct 2014 22:14:36 +0000 (+0200)
Subject: vfs: add whiteout support
X-Git-Tag: fixes-against-v3.18-rc2~5^2~4^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=787fb6bc9682ec7c05fb5d9561b57100fbc1cc41;p=pandora-kernel.git

vfs: add whiteout support

Whiteout isn't actually a new file type, but is represented as a char
device (Linus's idea) with 0/0 device number.

This has several advantages compared to introducing a new whiteout file
type:

 - no userspace API changes (e.g. trivial to make backups of upper layer
   filesystem, without losing whiteouts)

 - no fs image format changes (you can boot an old kernel/fsck without
   whiteout support and things won't break)

 - implementation is trivial

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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