[PATCHSET v4.1 4/5] fstests: enable FITRIM for the realtime section

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Hi all,

One thing that's been missing for a long time is the ability to tell
underlying storage that it can unmap the unused space on the realtime
device.  This short series exposes this functionality through FITRIM.
Callers that want ranged FITRIM should be aware that the realtime space
exists in the offset range after the data device.  However, it is
anticipated that most callers pass in offset=0 len=-1ULL and will not
notice or care.

If you're going to start using this code, I strongly recommend pulling
from my git trees, which are linked below.

This has been running on the djcloud for months with no problems.  Enjoy!
Comments and questions are, as always, welcome.

--D

kernel git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=realtime-discard

fstests git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=realtime-discard
---
Commits in this patchset:
 * xfs: refactor statfs field extraction
 * common/xfs: FITRIM now supports realtime volumes
---
 common/xfs    |   46 ++++++++++++++++++++++++++++++++++++++++++++--
 tests/xfs/176 |    4 ++--
 tests/xfs/187 |    6 +++---
 tests/xfs/541 |    6 ++----
 4 files changed, 51 insertions(+), 11 deletions(-)





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