Patchset can be fetched from github: dedupe_latest

Inband dedupe(in-memory backend only) ioctl support for btrfs-progs.

v7 changes:
   Update ctree.h to follow kernel structure change
   Update print-tree to follow kernel structure change
V8 changes:
   Move dedup props and on-disk backend support out of the patchset
   Change command group name to "dedupe-inband", to avoid confusion with
   possible out-of-band dedupe. Suggested by Mark.
   Rebase to latest devel branch.
V9 changes:
   Follow kernels ioctl change to support FORCE flag, new reconf ioctl,
   and more precious error reporting.
v10 changes:
   Rebase to v4.10.
   Add BUILD_ASSERT for btrfs_ioctl_dedupe_args
v10.1 changes:
   Rebase to v4.14.
v10.2 changes:
   Rebase to v4.16.1.
v10.3 changes:
   Rebase to v4.17.
v10.4 changes:
   Deal with offline reviews from Misono Tomohiro.
   1. s/btrfs-dedupe/btrfs-dedupe-inband
   2. Replace strerror(errno) with %m
   3. Use SZ_* instead of intermedia number
   4. update btrfs-completion for reconfigure subcommand
v10.5 changes:
   Rebase to v4.17.1.
v10.6 changes:
   Rebase to v4.19.

Qu Wenruo (5):
  btrfs-progs: Basic framework for dedupe-inband command group
  btrfs-progs: dedupe: Add enable command for dedupe command group
  btrfs-progs: dedupe: Add disable support for inband dedupelication
  btrfs-progs: dedupe: Add status subcommand
  btrfs-progs: dedupe: introduce reconfigure subcommand

 Documentation/                  |   1 +
 Documentation/btrfs-dedupe-inband.asciidoc | 167 ++++++++
 Documentation/btrfs.asciidoc               |   4 +
 Makefile                                   |   3 +-
 btrfs-completion                           |   6 +-
 btrfs.c                                    |   2 +
 cmds-dedupe-ib.c                           | 437 +++++++++++++++++++++
 commands.h                                 |   2 +
 dedupe-ib.h                                |  28 ++
 ioctl.h                                    |  38 ++
 10 files changed, 686 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/btrfs-dedupe-inband.asciidoc
 create mode 100644 cmds-dedupe-ib.c
 create mode 100644 dedupe-ib.h


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