[PATCH] Add support for RENAME_{EXCHANGE,WHITEOUT}

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Add support for the RENAME_WHITEOUT and RENAME_EXCHANGE flags in
renameat2(). This brings us pretty close to having btrfs ready to be
an upper layer for overlayfs. (The last remaining issue is in
btrfs_sync_file, which I'm looking at next if I have time.)

This includes Davide Italiano's implementation of RENAME_EXCHANGE. I
quickly pinged him on github [1] last week to confirm resubmission of
his patch which originally went to this list on 2 April 2015 and
didn't make it in.

This is my first time submitting a kernel patch, I think I've covered
all the style recommendations, and also addressed Filipe David
Manana's review notes [2] on Davide Italiano's patch. Certainly let me
know if there's anything else that should be cleaned up. Thanks!

[1] https://github.com/fuhry/linux/commit/9a7300d973a192193857c595997f292a14c14197#commitcomment-15570553
[2] https://www.marc.info/?l=linux-btrfs&m=142796914520768&w=3

--
Dan Fuhry
Senior Software Engineer, Datto Inc
(203) 529-4949 x402 / dfuhry@xxxxxxxxx
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