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Re: beginners project: RENAME_WHITEOUT

To: xfs@xxxxxxxxxxx
Subject: Re: beginners project: RENAME_WHITEOUT
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 22 Jan 2015 12:05:44 +1100
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20150109133019.GD28570@xxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <20141107190959.GB21021@xxxxxxxxxxxxx> <20141108234232.GJ28565@dastard> <CAJfpegsvZtCxV-GSJ4ON7=JeNkZ7o2=+fmbOTrxDAfm==b1XBw@xxxxxxxxxxxxxx> <20141110135249.GR28565@dastard> <20150109133019.GD28570@xxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Jan 09, 2015 at 08:30:19AM -0500, Carlos Maiolino wrote:
> So, giving this conversation, should we implement WHITEOUTS in XFS
> already, or is this isn't decided yet?

Sure, we have to implement whiteouts to support overlayfs.

Though internally we'll do it with DT_WHT in dirents, so we don't
need inodes on disk for them. lookups will just have to allocate in
memory chardev inodes so the rest of the world will function
appropriately if they access whiteouts from the lower filesystems.


Dave Chinner

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