[NOPATCH v5]: XFS reverse-mapping, reflink, and dedupe support

[Darrick J. Wong]

Hi all,

Dave's started reviewing the rmap/reflink patches I sent him, and said he'll
trickle the patches (with various edits) out to the mailing list as he gets to
them.  Therefore, I won't blast the mailing list with the kernel/xfsprogs
patches that will soon be obsolete, though I will push out all the pending
xfstests and xfsdocumentation fixes.

I've also renamed the confusing 'for-dave' branches on github to
'rmap-reflink-devel' to make it clearer that it's just a development branch and
not what I'm trying to get pushed upstream.

Soooo... stuff I'm hoping to get upstream for 4.6:
https://github.com/djwong/linux/tree/for-dave-for-4.6
https://github.com/djwong/xfsprogs/tree/for-dave-for-4.6

Stuff I hope to get upstream:
https://github.com/djwong/xfs-documentation/tree/reflink-devel
https://github.com/djwong/xfstests/tree/reflink-dev

Development branch, not for upstream:
https://github.com/djwong/linux/tree/rmap-reflink-devel
https://github.com/djwong/xfsprogs/tree/rmap-reflink-devel

I'm taking a break from active development for a week or two to concentrate on
finding and fixing bugs.  The content of the branches hasn't changed from
a few days ago, so no need to re-pull if you just did.

--D