Hi all, Create a new ioctl to report the number of owners of each disk block so that reflink-aware defraggers can make better decisions about which extents to target. If you're going to start using this mess, you probably ought to just pull from my git trees, which are linked below. This is an extraordinary way to destroy everything. 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=report-refcounts xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=report-refcounts fstests git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=report-refcounts --- fs/xfs/Makefile | 1 fs/xfs/xfs_fsrefs.c | 935 ++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_fsrefs.h | 34 + fs/xfs/xfs_ioctl.c | 135 +++++ fs/xfs/xfs_trace.c | 1 fs/xfs/xfs_trace.h | 74 +++ include/uapi/linux/fsrefcounts.h | 96 ++++ 7 files changed, 1276 insertions(+) create mode 100644 fs/xfs/xfs_fsrefs.c create mode 100644 fs/xfs/xfs_fsrefs.h create mode 100644 include/uapi/linux/fsrefcounts.h
