D12135: Allow disabling of CoW to fail when not supported by filesystem

[Stefan Brüns]

bruns created this revision.
bruns added a reviewer: Baloo.
Restricted Application added projects: Frameworks, Baloo.
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REVISION SUMMARY
  It is fine to neither support reading of attrs nor setting the NO_COW
  flag. The latter only happens when the filesystem does not use CoW at
  all.

TEST PLAN
  make
  TMPDIR=<dir on XFS> ctest
  TMPDIR=<dir on BTRFS> ctest
  strace -eioctl -f ctest -R transactiontest

REPOSITORY
  R293 Baloo

BRANCH
  accept_eopnotsupp_on_chattr

REVISION DETAIL
  https://phabricator.kde.org/D12135

AFFECTED FILES
  src/engine/fsutils.cpp

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