Hi all, This patch documents the realtime reverse mapping btree. If you're going to start using this code, I strongly recommend pulling from my git trees, which are linked below. Comments and questions are, as always, welcome. kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=realtime-rmap xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=realtime-rmap fstests git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=realtime-rmap xfsdocs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-documentation.git/log/?h=realtime-rmap --- .../allocation_groups.asciidoc | 8 - .../internal_inodes.asciidoc | 4 .../journaling_log.asciidoc | 9 + design/XFS_Filesystem_Structure/realtime.asciidoc | 5 design/XFS_Filesystem_Structure/rtrmapbt.asciidoc | 216 ++++++++------------ 5 files changed, 105 insertions(+), 137 deletions(-)