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Date: Wed, 27 Jul 2016 01:41:01 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Jaegeuk Kim <jaegeuk@kernel.org>
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Subject: Re: [GIT PULL] f2fs for 4.8
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>  - ioctl to move a range of data between files

Please run this through the linux-api list first.  We had so many
problem with random ioctls on random file systems in the past.  Also
I know Samsung had an xfs (and maybe ext4?) implementation of this
functionality in the past, so it would be extremtly useful to have
some discussion on that.

Also didn't this just show up last week for the first time?