[RFC PATCH] fiemap cow fork flag

[Brian Foster <bfoster@redhat.com>]

Hi all,

This is just something I slapped together when poking around and learning the
reflink cow fork stuff. E.g., I find it useful to see exactly what's going on
in certain situations, verify the background reclaim works, etc. I'm not sure
it's worthy of a generic fiemap flag since I believe the cow fork is a fairly
XFS-specific mechanism, it's limited to extra blocks that haven't been written,
and probably dumps information obtainable via other means (tracepoints). I'm
throwing it up on the list anyways for reference and/or archival purposes, if
nothing else. Thanks!

Brian

Brian Foster (1):
  xfs: fiemap support for cow fork

 fs/xfs/xfs_iomap.c          | 45 +++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_iomap.h          |  1 +
 fs/xfs/xfs_iops.c           |  4 ++++
 include/uapi/linux/fiemap.h |  1 +
 4 files changed, 51 insertions(+)

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2.7.4