*****  btrfs-progs 4.5 (Mar 2016) *****
  * new/moved commands
      * btrfs-show-super -> btrfs inspect-internal dump-super
      * btrfs-debug-tree -> btrfs inspect-internal dump-tree
  * new commands
      * btrfs fi du - calculate disk usage, including shared extents
  * enhancements
      * device delete - delete by id (needs kernel support, not merged to
        4.6)
      * check - new option to specify chunk root
      * debug-tree/dump-tree - option -t understands human readable name of
        the tree (along numerical ids)
      * btrfs-debugfs - can dump block group information
  * bugfixes
      * all commands should accept the option separator "--"
      * several fixes in device scan
      * restore works on filesystems with sectorsize > 4k
      * debug-tree/dump-tree - print compression type as string
      * subvol sync: fix crash, memory corruption
      * argument parsing fixes: subvol get-default, qgroup create/destroy/
        assign, inspect subvolid-resolve
      * check for block device or regular file in several commands
  * other
      * documentation updates
      * manual pages for the moved tools now point to btrfs-filesystem
      * testsuite updates

****  btrfs-progs 4.5.1 (Mar 2016) ****
  * mkfs: allow DUP on multi-device filesystems
  * bugfixes: build fixes, assorted other fixes

*****  btrfs-progs 4.4 (Jan 2016) *****
User visible changes:
  * mkfs.btrfs --data dup
People asked about duplicating data on a single device for a long time. There
are no technical obstacles preventing that, so it got enabled with a warning
about potential dangers when the device will not do the duplicated copies. See
mkfs.btrfs section DUP PROFILES ON A SINGLE DEVICE.
  * support balance filters added/enhanced in linux 4.4
      * usage=min..max -- enhanced to take range
      * stripes=min..max -- new, filter by stripes for raid0/10/5/6
      * limit=min..max -- enhanced to take range
Noe: due to backward compatibility, the range maximum for 'usage' is not
inclusive as for the others, to keep the same behaviour as usage=N .
  * manual pages enhanced (btrfs, mkfs, mount, filesystem, balance)
  * error messages updates, rewordings -- some fstests may break due to that
  * added support for free-space-tree implementation of space cache -- this
    requires kernel 4.5 and is not recommended for non-developers yet
  * btrfs filesystem usage works with mixed blockgroups
Other:
  * installation to /usr/local -- this has unintentionally changed during
    conversion to autotools in 3.19
  * check: fix a false alert where extent record has wrong metadata flag
  * improved stability on fuzzed/crafted images when reading sys array in
    superblock
  * build: the 'ar' tool is properly deteced during cross-compilation
  * debug-tree: option -t understands ids for tree root and chnuk tree
  * preparatory work for btrfs-convert rewrite
  * sparse, gcc warning fixes
  * more memory allocation failure handling
  * cleanups
  * more tests
Bugfixes:
  * chunk recovery: fix floating point exception
  * chunk recovery: endianity bugfix during rebuild
  * mkfs with 64K pages and nodesize reported superblock checksum mismatch
  * check: properly reset nlink of multi-linked file

****  btrfs-progs 4.4.1 (Feb 2016) ****
  * find-root: don't skip the first chunk
  * free-space-tree compat bits fix
  * build: target symlinks
  * documentation updates
  * test updates

*****  btrfs-progs 4.3 (Nov 2015) *****
  * mkfs
      * mixed mode is not forced for filesystems smaller than 1GiB
      * mixed mode broken with mismatching sectorsize and nodesize, fixed
      * print version info earlier
      * print devices sorted by id
      * do not truncate target image with --rootsize
  * fi usage:
      * don't print global block reserve
      * print device id
      * minor output tuning
      * other cleanups
  * calc-size:
      * div-by-zero fix on an empty filesystem
      * fix crash
  * bugfixes:
      * more superblock sanity checks
      * consistently round size of all devices down to sectorsize
      * misc leak fixes
      * convert: don't try to rollback with a half-deleted ext2_saved
        subvolume
  * other:
      * check: add progress indicator
      * scrub: enahced error message
      * show-super: read superblock from a given offset
      * add README
      * docs: update manual page for mkfs.btrfs, btrfstune, balance,
        convert and inspect-internal
      * build: optional build with more warnings (W=...)
      * build: better support for static checkers
      * build: html output of documentation
      * pretty-print: last_snapshot for root_item
      * pretty-print: stripe dev uuid
      * error reporting wrappers, introduced and example use
      * refactor open_file_or_dir
      * other docs and help updates
  * testing:
      * test for nodes crossing stripes
      * test for broken 'subvolume sync'
      * basic tests for mkfs, raid option combinations
      * basic tests for fuzzed images (check)
      * command intrumentation (eg valgrind)
      * print commands if requested
      * add README for tests

****  btrfs-progs 4.3.1 (Nov 2015) ****
  * fixes
      * device delete: recognize 'missing' again
      * mkfs: long names are not trimmed when doing ssd check
      * support partitioned loop devices
  * other
      * replace several mallocs with on-stack variables
      * more memory allocation failure handling
      * add tests for bugs fixed
      * cmd-device: switch to new message printing helpers
      * minor code cleanups

*****  btrfs-progs 4.2 (Sep 2015) *****
  * enhancements:
      * mkfs: do not create extra single chunks on multiple devices
      * resize: try to guess the minimal size, 'inspect min-dev-size'
      * qgroup assign: add option to schedule rescan
      * chunk-recover: be more verbose about the scanning process
  * fixes:
      * check:
          * find stripes crossing stripe boundary -- created by convert
          * print correct range for file hole when there are no extents
            and learn how to fix it
      * replace: more sanity checks
      * convert: concurrency fixes related to reporting progress
      * find-root: option -a will not skip the current root anymore
      * subvol list: fix occasional crash
      * do not create stripes crossing stripe boundary
  * build:
      * fixes for musl libc
      * preliminary support for android (not working yet, more code changes
        needed)
      * new EXTRA_CFLAGS and EXTRA_LDFLAGS
  * other:
      * lots of cleanups
      * tests: lots of updates, new tests, framework improvements
      * documentation updates
      * debugging: print-tree shows stripe length

****  btrfs-progs 4.2.1 (Sep 2015) ****
  * fix an off-by-one error in cross-stripe boundary check
      * if nodesize was 64k, any metadata block was reported as crossing,
        this leads to mkfs failure for example due to "no free blocks
        found"
      * for other nodesizes, if the end of the metadata block was 64k
        aligned, it was incorrectly reported by fsck
  * convert: don't write uninitialized data to image
  * image:
      * don't loop with option -t0
      * don't create threads if compression is not requested
  * other: minor cleanups

****  btrfs-progs 4.2.2 (Oct 2015) ****
  * fi label: use fallback if the label ioctl is not available
  * convert: check nodesize constraints against commandline features (-O)
  * scrub: report status 'running' until all devices are finished
  * device scanning might crash in some scenarios
  * fi usage: print summary for non-root users

****  btrfs-progs 4.2.3 (Oct 2015) ****
  * subvol sync: make it actually work again: it's been broken since 4.1.2,
    due to a reversed condition it returned immediatelly instead of waiting
  * scanning: do not scan already discovered filesystems (minor optimization)
  * convert: better error message in case the filesystem is not finalized
  * restore: off-by-one symlink path check fix

*****  btrfs-progs 4.1 (Jun 2015) *****
  * bugfixes
      * fsck.btrfs: no bash-isms
      * bugzilla 97171: invalid memory access (with tests)
      * receive:
          * cloning works with --chroot
          * capabilities not lost
      * mkfs: do not try to register bare file images
      * option --help accepted by the standalone utilities
  * enhancements
      * corrupt block: ability to remove csums
      * mkfs:
          * warn if metadata redundancy is lower than for data
          * options to make the output quiet (only errors)
          * mixed case names of raid profiles accepted
          * rework the output:
          * more comprehensive, 'key: value' format
      * subvol:
          * show:
              * print received uuid
              * update the output
              * new options to specify size units
          * sync: grab all deleted ids and print them as they're removed,
              previous implementation only checked if there are any to be
              deleted - change in command semantics
      * scrub: print timestamps in days HMS format
      * receive:
          * can specify mount point, do not rely on /proc
          * can work inside subvolumes
      * send: new option to send stream without data (NO_FILE_DATA)
      * convert: specify incompat features on the new fs
      * qgroup:
          * show: distinguish no limits and 0 limit value
          * limit: ability to clear the limit
      * help for 'btrfs' is shorter, 1st level command overview
      * debug tree: print key names according to their C name
  * new
      * rescure zero-log
      * btrfsune:
          * rewrite uuid on a filesystem image
          * new option to turn on NO_HOLES incompat feature
  * deprecated
      * standalone btrfs-zero-log
  * other
      * testing framework updates
          * uuid rewrite test
          * btrfstune feature setting test
          * zero-log tests
          * more testing image formats
      * manual page updates
      * ioctl.h synced with current kernel uapi version
      * convert: preparatory works for more filesystems (reiserfs pending)
      * use static buffers for path handling where possible
      * add new helpers for send uilts that check memory allocations,
        switch all users, deprecate old helpers
      * Makefile: fix build dependency generation
      * map-logical: make it work again

****  btrfs-progs 4.1.1 (Jul 2015) ****
Do not use this version
  * bugfixes
      * defrag: threshold overflow fix
      * fsck:
          * check if items fit into the leaf space
          * fix wrong nbytes
      * mkfs:
          * create only desired block groups for single device
          * preparatory work for fix on multiple devices
  * enhancements
      * new alias for 'device delete': 'device remove'
  * other
      * fix compilation on old gcc (4.3)
      * documentation updates
      * debug-tree: print nbytes
      * test: image for corrupted nbytes
      * corupt-block: let it kill nbytes

****  btrfs-progs 4.1.2 (Jul 2015) ****
  * urgent bugfix: mkfs creates invalid filesystem, must be recreated

*****  btrfs-progs 4.0 (Apr 2015) *****
  * resize:
      * don't accept file as an argument (it's confusing)
      * print better error message in case of an error
  * restore: optionally restore metadata (time, mode, uid/gid)
  * receive: optionally enforce chroot
  * new rescue subcommand 'zero-log', same as btrfs-zero-log, but now also
    part of the main utility
  * check:
      * free space checks match kernel, fixes incorrect reports
  * convert: fix setting of checksum bit if --no-datasum is used
  * fsck.btrfs: don't print messages
  * fix quota rescan on PPC64 (mangled ioctl number)
  * test updates
  * documentation: files renamed to .asciidoc, misc fixups

****  btrfs-progs 4.0.1 (May 2015) ****
  * restore:
      * can restore symlinks, new option --symlinks
      * long option variants added
  * convert: dropped dependency on acl.h header and libacl is not required
    for build
  * fix for 'check' crash
  * device remove error message fix
  * preparatory works for fsid change

*****  btrfs-progs 3.19 (Mar 2015) *****
  * build converted to autotools
  * btrfs-image
      * restore can now run in parallel threads
      * fixed restore of multiple image from multiple devices onto a single
        dev
      * introduced metadump v2
  * check: make --init-csum-tree and --init-extent-tree work together
  * find-new: option to search through all metadata even if a root was
    already found
  * convert: show progress by default, can be turned off
  * corrupt-block: option to work on a specific root
  * bash completion script for all subcommands

****  btrfs-progs 3.19.1 (Mar 2015) ****
  * convert:
      * new option to specify metadata block size
      * --no-progress actually works
  * restore: properly handle the page boundary corner case
  * build fixes:
      * missing macro from public header, BTRFS_BUILD_VERSION
      * wrong handling of --enable-convert
  * fi usage: reports correct space for degraded mounts
  * other:
      * mkfs: help string updates
      * completion: added 'usage' subcommands
      * cleanups in qgroup code, preparatory work

*****  btrfs-progs 3.18 (Dec 2014) *****
  * mkfs - skinny-metadata feature is now on by default, first introduced in
    kernel 3.10
  * filesystem usage - give an overview of fs usage in a way that's more
    comprehensible than existing 'fi df'
  * device usage - more detailed information about per-device allocations
  * check
      * option to set a different tree root byte number
      * ability to link lost files to lost+found, caused by a recent kernel
        bug
      * repair of severely corrupted fs (use with care)
  * convert - option to show progress
  * subvol create - print the commit mode inline, print the global mode only
    if --verbose
  * other updates: musl-libc support, coverity bugfixes, new test images,
    documentation

****  btrfs-progs 3.18.1 (Jan 2015) ****
  * minor fixes
  * documentation updates

****  btrfs-progs 3.18.2 (Jan 2015) ****
  * qgroup show: print human readable sizes, options to say otherwise
  * check: new option to explicitly say no to writes
  * mkfs: message about trimming is not printed to stderr
  * fi show: fixed return value
  * tests: new infrastructure
  * btrfstune: force flag can be used together with seeding option
  * backtrace support is back
  * getopt cleanups
  * doc and help updates

*****  btrfs-progs 3.17 (Oct 2014) *****
  * check: --init-csum-tree actually does something useful, rebuilds the
    whole csum tree
  * /dev scanning for btrfs devices is gone
  * /proc/partitions scanning is gone, blkid is used exclusively
  * new subcommand subvolume sync
  * filesystem df: new options to set unit format
  * convert: allow to copy label from the origin, or specify a new one

****  btrfs-progs 3.17.1 (Nov 2014) ****
  * fi df: argument handling
  * fix linking with libbtrfs
  * replace: better error reporting
  * fi show: fixed stall if run concurrently with balance
  * check: fixed argument parsing for --subvol-extents
  * fi df: SI prefixes corrected

****  btrfs-progs 3.17.2 (Nov 2014) ****
  * check improvements
      * add ability to replace missing dir item/dir indexes
      * fix missing inode items
      * create missing root dirid
  * corrupt block: enhancements for testing fsck
  * zero-log: able to reset a fs with bogus log tree pointer (bug_72151)

****  btrfs-progs 3.17.3 (Dec 2014) ****
  * convert: fix conversion of sparse ext* filesystems
  * show: resolve to the correct path
  * fsck: more verbose error for root dir problems

*****  btrfs-progs 3.16 (Aug 2014) *****
  * mkfs: new option to specify UUID, drop experimental notice
  * check: new option to verify quotas, reduced memory requirements, new
    option to print extent sharing
  * restore: check length before decompression, more error handling, option
    to loop during restoring
  * balance: new filter 'limit'
  * recover: allow to read all sb copies
  * btrfstune: new option to force dangerous changes
  * receive: new option to limit number of errors
  * show-super: skip unrecognized sb, add option to force
  * debug-tree: print tree by id
  * documentation updates

****  btrfs-progs 3.16.1 (Sep 2014) ****
  * print GlobalReserve in fi df output
  * new option -R in subvol list
  * library version defines
  * static build is fixed
  * build without documentation is possible

****  btrfs-progs 3.16.2 (Oct 2014) ****
  * a few fixes in fsck and image tools

*****  btrfs-progs 3.14 (Apr 2014) *****
  * fsck: fixes and enhancements to --init-extent-tree mode
  * fsck: chunk-recover updates
  * scrub: add force option -f
  * send: check if subvolumes are read-only
  * subvol delete: add options to affect commit behaviour
  * btrfs: add property command group
  * restore: add dry-run option
  * restore: fix restoring of compressed files
  * mkfs: support for no-holes feature
  * mkfs: option -r deals with hardlinks and relative paths
  * mkfs: discard phase is interruptible
  * documentation updates

****  btrfs-progs 3.14.1 (Apr 2014) ****
  * properties: fix handling of option -t
  * restore: fix reading of compressed extents
  * minor code and doc updates

****  btrfs-progs 3.14.2 (May 2014) ****
  * documentation is now written in asciidoc and there are manpages for each
    subcommand
  * misc bugfixes

*****  btrfs-progs 3.12 (Nov 2013) *****
  * announcement, tarballs
  * first release after 0.19 (2009/06) with a lot of changes
