COW improvements and always_cow support V5

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Hi all,

this series adds the always_cow mode support after fixing various
little bugs and issues in the COW support.
write support a little bit first.


    git://git.infradead.org/users/hch/xfs.git always_cow.7

Gitweb:

    http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/always_cow.7


Changes since v4:
 - rebased on to of the mapping validation fixes from Brian and me
 - fix SEEK_DATA / SEEK_HOLE vs COW fork preallocations
 - sample the always_cow value in a per-mount variable
 - disable all preallocation, including in zero range and unshare

Changes since v3:
 - spelling fixes
 - improve argument naming and add a comment in xfs_reflink_allocate_cow
 - trace the COW imap if allocating COW blocks
 - collect a few reviewed-by tags from Darrick

Changes since v2:
 - add a patch to remove xfs_trim_extent_eof
 - add a patch to remove the separate io_type and rely on existing state
   in the writeback path
 - rework the truncate race handling in the writeback path a little more

Changes since v1:
 - make delalloc and unwritten extent conversions simpler and more robust
 - add a few additional cleanups
 - support all fallocate modes but actual preallocation
 - rebase on top of a fix from Brian (which is included as first patch
   to make the patch set more usable)



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