D12136: Avoid hardcoding of filesystems supporting CoW

[Stefan Brüns]

bruns created this revision.
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REVISION SUMMARY
  The correct way to check for CoW support and conditionally disabling it
  for the database is just by setting the NO_COW flag.
  
  The CoW support is not only filesystem dependent, but is affected by
  parameters at filesystem creation (XFS reflink) or mount time (BTRFS
  nodatacow).

TEST PLAN
  make
  ctest

REPOSITORY
  R293 Baloo

BRANCH
  disble_cow_unconditionally

REVISION DETAIL
  https://phabricator.kde.org/D12136

AFFECTED FILES
  src/engine/database.cpp

To: bruns, #baloo
Cc: #freebsd, #frameworks, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, alexeymin
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