btrfs-progs/CHANGES

btrfs-progs-6.3 (2023-04-27)
----------------------------
   * mkfs: option -R deprecated, options unified in -O (-R still works)
   * mkfs: fix potential race with udev leading to EBUSY due to repeatedly
     opened file descriptors
   * block-group-tree is out of experimental mode
      * available as 'mkfs.btrfs -O block-group-tree'
      * btrfstune can do in-place conversion to/from (use with care)
   * balance: fix recognizing old and new syntax
   * subvol snapshot: specific error if a failure is caused by an active swapfile
   * tree-stats: rephrase warning when run on a mounted filesystem
   * completion: 'filesystem du' also completes files
   * check: fix docs, help text and warning that --force + --repair works on a
     mounted filesystem
   * build: fix static build when static libudev is available
   * documentation:
      * more updates from wiki, developer docs, changelogs
      * reformatting
      * updates and fixes
   * other:
      * test updates and fixes
      * CI cleanups and old files removed
      * integration with Github actions

btrfs-progs-6.3.1 (2023-05-29)
""""""""""""""""""""""""""""""
   * convert: fix checksum of a block relocated from 0-1M range
   * qgroup show: fix formatting of limit values in json output
   * receive: report paret subovl UUID on errors
   * btrfsune: new option --convert-to-free-space-tree to convert from
     block-group-tree back to extent tree for block group tracking
   * mkfs: make option --rootdir more verbose and report start when filling
     from the given directory starts
   * experimental:
      * btrfstune: checksum switch logic reimplemented, conversion of all
        metadata and data now works, resume from various states also supported
   * other:
      * more CI github actions test coverage
      * more kernel/userspace source code sync
      * warning fixes
      * code cleanups
      * documentation updates

btrfs-progs-6.2 (2023-02-28)
----------------------------
   * receive: fix a corruption when decompressing zstd extents
   * subvol sync: print total number and deletion progress
   * accelerated hash algorithm implementations in fallback mode on x86_64
   * fi mkswapfile: new option --uuid
   * new global option --log=level to set the verbosity level directly
   * other:
      * experimental: update checksum conversion (not usable yet)
      * build actually requires -std=gnu11
      * refactor help option formatting, auto wrap long lines

btrfs-progs-6.2.1 (2023-02-03)
""""""""""""""""""""""""""""""
   * fix build with crypto libraries
   * CI images updated, build tests extended

btrfs-progs-6.2.2 (2023-03-25)
""""""""""""""""""""""""""""""
   * fix build on old x86 architectures with builtin crypto
   * device stats: fix printing wrong values in tabular output
   * qgroup show: fix qgroup id formatting in json output
   * restore: fix restoring xattrs on directories
   * restore: don't modify metadata in dry-run mode
   * balance: fix some cases wrongly parsed as old syntax
   * balance: warn when deprecated syntax is used
   * seeding: fall back to old way if sysfs device fsid is not available
   * convert: handle orphan file ext4 feature
   * other:
      * sync ioctl definitions
      * enable github CI
      * update documentation

btrfs-progs-6.1 (2022-12-22)
----------------------------
   * NOTE: this version breaks build of applications using ctree.h and qgroup items
   * filesystem df: add json output
   * qgroup show: add json output
   * new command: 'inspect-internal map-swapfile' to check swapfile and its
     swapfile_offset value used for hibernation
   * corrupt-block: fix parsing of option --root argument
   * experimental (interfaces not finalized):
      * new command 'inspect-internal list-chunks'
      * new group reflink, command clone
   * other:
      * synchronize some files with kernel versions
      * docs updates
      * build: use gnu11

btrfs-progs-6.1.1 (2023-01-03)
""""""""""""""""""""""""""""""
   * subvol list: fix printing of UUID
   * revert changes to ctree.h regarding qgroup items, breaks build of several
     applications
   * hide __init definition in kerncompat.h, may break build

btrfs-progs-6.1.2 (2023-01-05)
""""""""""""""""""""""""""""""
   * revert libbtrfs changes to v6.0.2, fix remaining build problems

btrfs-progs-6.1.3 (2023-01-25)
""""""""""""""""""""""""""""""
   * fi mkswapfile: fix setting size
   * mkfs: check zoned support of libblkid
   * check: improve error messages for mismatched references
   * other:
      * pass CFLAGS to static build
      * documentation updates

btrfs-progs-6.0 (2022-10-11)
----------------------------
   * fi usage: in tabular output, print total size and slack size
   * mkfs:
      * option -O now accepts values from -R to unify the interface (-R will
	continue to work)
      * zone reset and discard is done in parallel on all devices
      * removed option --leafsize, deprecated long time ago
   * corrupt-block: recalculate checksum when changing generation
   * fixes:
      * convert: fix reserved range detection and overlaps
      * mkfs: fix creating files with reserved inode numbers with --rootdir
      * receive: escape filenames in command attributes
      * fix extent buffer leaks after transaction abort
   * experimental:
      * mkfs: support for block-group-tree (kernel 6.1)
      * fsverity in send (protocol v3, WIP)
      * btrfstune -b converts to block-group-tree
   * other:
      * cleanups, refactoring
      * new and updated tests
      * update documentation

btrfs-progs-6.0.1 (2022-11-04)
""""""""""""""""""""""""""""""
   * send: minor speed up for v2 due to increased buffer size
   * resize: invalid command line options fail with error code
   * quota rescan:
      * add long options --status and --wait
      * new option to wait but don't start rescan
   * qgroup show: print path by default, updated format
   * qgroup: new subcommand clear-stale, remove qgroups without their subvolumes
   * experimental:
      * add warnings to commands that have it enabled (mkfs, image, btrfstune)
   * other:
      * documentation, help text, error message updates

btrfs-progs-6.0.2 (2022-11-24)
""""""""""""""""""""""""""""""
   * fixes:
      * resize cancel did not work in some cases
      * fix fileattr stream command format and add workaround when it cannot be applied
      * properly handle degraded raid56 reads
      * fi defrag: fix verbosity, don't print file names by default
      * receive: fix silent data loss after fall back from encoded write
   * fi mkswapfile: new command to create a formatted swapfile in one go

btrfs-progs-5.19 (2022-08-16)
-----------------------------
   * send: support protocol version 2
   * fi show: print all missing devices
   * device stats: add tabular output
   * replace: add alias to device group (device replace)
   * check: validate free space tree items
   * fixes:
      * convert: support large filesystems (block count > 32bit)
      * recognize filesystems with verity enabled
      * mkfs and DUP could write out of order, fix it for zoned mode
   * build:
      * optional support for LZO and ZSTD in receive
      * compatibility with glibc 2.36 (mount.h)
      * add fallbacks for new GCC builtins
   * other:
      * corrupt-block: target specific items, offsets
      * documentation updates, new pages from wiki
      * new tests

btrfs-progs-5.19.1 (2022-09-12)
"""""""""""""""""""""""""""""""
   * fix memory leaks (extent buffer, path)
   * check: verify block device size vs item
   * rescue fix-device-size: allow to shrink device item
   * receive: fix crash on wrong pinter free()
   * other:
      * experimental: support for block-group-tree
      * documentation updates
      * new tests

btrfs-progs-5.18 (2022-05-25)
-----------------------------
   * fixes:
      * dump-tree: don't print traling zeros in checksums
      * recognize paused balance as exclusive operation state, allow to start
        device add
      * convert: properly initialize target filesystem label
      * mkfs: don't create free space bitmaps for empty filesystem
   * restore: make lzo support build-time configurable, print supported
     compression in help text
   * update kernel-lib sources
   * other:
      * documentation updates, finish conversion to RST, CHANGES and INSTALL
        could be included into RST
      * fix build detection of experimental mode
      * new tests

btrfs-progs-5.18.1 (2022-06-06)
"""""""""""""""""""""""""""""""
   * fixes:
      * convert: fix self reference of toplevel directory
      * build: make kernel lib headers compatible with C++
   * zoned mode: verify minimum zone size 4MiB
   * libbtrfs: cleanups, merge headers and remove declarations of unexported
     symbols
   * other: documentation updates

btrfs-progs-5.17 (2022-04-26)
-----------------------------
   * check:
      * repair wrong num_devices in superblock
      * recognize overly long xattr names
      * fix wrong total bytes check for seed device
   * auto-repair on read on RAID56
   * property set: unify handling of empty value to mean default, changed meaning
     for property 'compression' to allow reset to default and to set NOCOMPRESS,
     since kernel 5.14
   * fixes:
       * dump-tree: print fs-verity items
       * fix location of system chunk on zoned filesystem
       * do not allow setting seeding flag on a filesystem with dirty log
       * mkfs and subpage support: use sectorsize as nodesize fallback for mixed
	 profiles
   * preparatory work for extent tree v2, global roots
   * experimental feature (unstable interface, not built by default,
       do not use for production)
       * btrfstune: option --csum to switch checksum algorithm
   * other:
       * cleanups, refactoring
       * update documentation build, remove asciidocs leftovers
       * update fssum to consider xattrs
       * add fsstress

btrfs-progs-5.16 (2022-01-12)
-----------------------------
   * rescue: new subcommand clear-uuid-tree to fix failed mount due to bad uuid
     subvolume keys, caught by tree-checker
   * fi du: skip inaccessible files
   * prop: properly resolve to symlink targets
   * send, receive: fix crash after parent subvolume lookup errors
   * build:
      * fix build on 5.12+ kernels due to changes in linux/kernel.h
      * fix build on musl with old kernel headers
   * other:
      * error handling fixes, cleanups, refactoring
      * extent tree v2 preparatory work
      * lots of RST documentation updates (last release with asciidoc sources),
        https://btrfs.readthedocs.io

btrfs-progs-5.16.1 (2022-02-04)
"""""""""""""""""""""""""""""""
   * mkfs: support DUP on metadata on zoned devices
   * subvol delete: drop warning for root when search ioctl fails
   * check:
      * fix --init-csum-tree to not create checksums for extents that are not
        supposed to have them
      * add check for metadata item levels
   * add udev rule for zoned devices as they require mq-deadline
   * build: fix redefinition of ALIGN on mixed old/new kernel/userspace (5.11)
   * other:
      * typo fixes
      * new tests
      * CI targets updated

btrfs-progs-5.16.2 (2022-02-16)
"""""""""""""""""""""""""""""""
   * mkfs: fix detection of profile type for zoned mode when creating DUP
   * build:
      * add missing stub for zoned mode helper when zoned mode not enabled
      * fix 64bit types on MIPS and PowerPC
      * improved zoned mode support autodetection, for systems with existing
        blkzone.h header but missing support for zone capacity
   * other:
      * doc updates
      * test updates

btrfs-progs-5.15 (2021-11-05)
-----------------------------
   * mkfs: new defaults!
      * no-holes
      * free-space-tree
      * DUP for metadata unconditionally
   * libbtrfsutil
      * add missing profile defines
   * libbtrfs
      * minimize its impact on the other code, refactor and separate implementation
        where needed, cleanup afterwards, reduced header exports
   * documentation
      * introduce sphinx build and RST versions of manual pages, will become the
        new format and replace asciidoc
   * fixes:
      * fix warning regarding v1 space cache when only v2 (free space tree) is
        enabled
   * other
      * lots of cleanups and refactoring
      * zoned mode uses direct io for file backed images
      * new and updated tests

btrfs-progs-5.15.1 (2021-11-22)
"""""""""""""""""""""""""""""""
   * fixes:
      * fi usage: fix wrongly reported space of used or unallocated space
      * fix detection of block device discard capability
   * check: add more sanity checks for checksum items
   * build: make sphinx optional backend for documentation

btrfs-progs-5.14 (2021-09-10)
-----------------------------
   * convert:
      * new option --uuid to copy, generate or set a given uuid
      * improve output
   * mkfs:
      * allow to create degenerate raid0 (on 1 device) and raid10 (on 2 devices)
   * image:
      * improved error messages
      * fix some alignment of restored image
   * subvol delete: allow to delete by id when path is not resolvable
   * check:
      * require alignment of nodesize for 64k page systems
      * detect and fix invalid block groups
   * libbtrfs (deprecated):
      * remove most exported symbols, leave only a few that are used by snapper
      * no version change (still 0.1)
      * remove btrfs-list.h, btrfsck.h
   * fixes:
      * reset generation of space v1 if v2 is used
      * fi us: don't wrongly report missing device size when partition is not readable
   * other:
      * build: experimental features
      * build: better detection of 64bit timestamp support for ext4
      * corrupt-block: block group items
      * new and updated tests
      * refactoring
   * experimental features:
      * new image dump format, with data

btrfs-progs-5.14.1 (2021-09-20)
"""""""""""""""""""""""""""""""
   * fixes:
      * defrag: fix parsing of compression (option -c)
      * add workaround for old kernels when reading zone sizes
      * let only check and restore open the fs with transid failures, namely
        preventing btrfstune to do so
      * convert: --uuid copy does not fail on duplicate uuids

btrfs-progs-5.14.2 (2021-10-08)
"""""""""""""""""""""""""""""""
   * fixes
      * zoned mode
          * properly detect non-zoned devices in emulation mode
          * properly create quota tree
          * raid1c3/4 also excluded from unsupported profiles
      * use sysfs-based detection of device discard capability, fix mkfs-time trim
        for non-standard devices
      * mkfs: fix creation of populated filesystem with free space tree
      * detect multipath devices (needs libudev)
   * replace start: add option -K/--nodiscard, similar to what mkfs or device add has
   * dump-tree: print complete root_item
   * mkfs: add option --verbose
   * sb-mod: better help, no checksum calculation on read-only actions
   * subvol show:
      * print more information (regarding send and receive)
      * print warning if read-write subvolume has received_uuid set
   * property set:
      * add parameter -f to force changes
      * changing ro->rw switch now needs -f if subvolume has received_uuid set,
        (see documentation)
   * build
      * optional libudev (on by default)
   * other
      * remove deprecated support for CREATE_ASYNC bit for subvolume ioctl
      * CI updates
      * new and updated tests

btrfs-progs-5.13 (2021-07-13)
-----------------------------
   * restore: remove loop checks for extent count and directory scan
   * inspect dump-tree: new options to print node (--csum-headers) and data
     checksums (--csum-items)
   * fi usage:
      * print stripe count for striped profiles
      * print zoned information: size, total unusable
   * mkfs: print note about sha256 accelerated module loading issue
   * check: ability to reset dev_item::bytes_used
   * fixes
      * detect zoned kernel support at run time too
      * exclusive op running check return value
   * fi resize: support cancel (kernel 5.14)
   * device remove: support cancel (kernel 5.14)
   * documentation about general topics
      * compression
      * zoned mode
      * storage model
      * hardware considerations
   * other
      * libbtrfsutil API overview
      * help text fixes and updates
      * hash speedtest measure time, cycles using perf and print throughput

btrfs-progs-5.13.1 (2021-07-30)
"""""""""""""""""""""""""""""""
   * build: fix build on musl libc due to missing definition of NAME_MAX
   * check:
      * batch more work into one transaction when clearing v1 free space inodes
      * detect directories with wrong number of links
   * libbtrfsutil: fix race between subvolume iterator and deletion
   * mkfs: be more specific about supported profiles for zoned device
   * other:
      * documentation updates

btrfs-progs-5.12 (2021-05-10)
-----------------------------
   * libbtrfsutil: relicensed to LGPL v2.1+
   * mkfs: zoned mode support (kernel 5.12+)
   * fi df: show zone_unusable per profile type in zoned mode
   * fi usage: show total amount of zone_unusable
   * fi resize: fix message for exact size
   * image: fix warning and enlarge output file if necessary
   * core
       * refactor chunk allocator for more modes
       * implement zoned mode support: allocation and writes, sb log
       * crypto/hash refactoring and cleanups
       * refactoring and cleanups
   * other
      * test updates
      * CI updates
      * travis-ci integration disabled
      * docker images updated, more coverage
      * incomplete build support for Android removed
   * doc updates
      * chattr mode m for 'NOCOMPRESS"
      * swapfile used from fstab
      * how to add a new export to libbtrfsutil
      * update status of mount options since 5.9

btrfs-progs-5.12.1 (2021-05-13)
"""""""""""""""""""""""""""""""
   * build: fix missing symbols in libbtrfs
   * mkfs: check for minimal number of zones
   * check: fix warning about cache generation when free space tree is enabled
   * fix superblock write in zoned mode on 16K pages

btrfs-progs-5.11 (2021-03-05)
-----------------------------
   * fix device path canonicalization for device mapper devices
   * receive: remove workaround for setting capabilities, all stable kernels
     have been patched
   * receive: fix duplicate mount path detection
   * rescue: new subcommand create-control-device
   * device stats: minor fix for plain text format output
   * build: detect if e2fsprogs support 64bit timestamps
   * build: drop libmount, required functionality has been reimplemented
   * mkfs: warn when raid56 is used
   * balance convert: warn when raid56 is used
   * other
      * new and updated tests
      * documentation updates
         * seeding device
         * raid56 status
      * CI updates
         * docker images for various distros

btrfs-progs-5.11.1 (2021-03-24)
"""""""""""""""""""""""""""""""
   * properly format checksums when a mismatch is reported
   * check: fix false alert on tree block crossing 64K page boundary
   * convert:
      * refuse to convert filesystem with 'needs_recovery'
      * update documentation to require fsck before conversion
   * balance convert: fix raid56 warning when converting other profiles
   * fi resize: improved summary
   * other
      * build: fix checks and autoconf defines
      * fix symlink paths for CI support scripts
      * updated tests

btrfs-progs-5.10 (2021-01-18)
-----------------------------
   * scrub status:
      * print percentage of progress
      * add size unit options
   * fi usage: also print free space from statfs
   * convert: copy full 64 bit timestamp from ext4 if available
   * check:
      * add ability to repair extent item generation
      * new option to remove leftovers from inode number cache (-o inode_cache)
   * check for already running exclusive operation (balance, device add/...)
     when starting one
   * preliminary json output support for 'device stats'
   * fixes:
      * subvolume set-default: id 0 correctly falls back to toplevel
      * receive: align internal buffer to allow fast CRC calculation
      * logical-resolve: distinguish -o subvol and bind mounts
   * build: new dependency libmount
   * other
      * doc fixes and updates
      * new tests
      * ci on gitlab temporarily disabled
      * debugging output enhancements

btrfs-progs-5.10.1 (2021-02-05)
"""""""""""""""""""""""""""""""
   * static build works again
   * other:
      * add a way to test static binaries with the testsuite
      * clarify scrub docs
      * update dependencies, minimum version for libmount is 2.24, this may
        change in the future

btrfs-progs-5.9 (2020-10-23)
----------------------------
   * mkfs:
      * switch default to single profile for multi-device filesystem, up to
        now it was raid0 that may not be simple to convert to some other profile
        as raid0 needs a workspace on all device for that
      * new option -R for run-time options (eg. mount time enabled), now
        understands free-space-tree
   * subvolume delete:
      * refuse to delete the default subvolume (kernel will not allow that but
        the error reason is not obvious)
      * warn on EPERM, eg. if send is on progress on the subvolume
   * convert:
      * fix 32bit overflows on large filesystems
      * improved error handling and error messages
      * check free space taking fragmentation into account
   * check:
      * detect and repair wrong inode generation
      * minor improvement in error reporting on roots
   * libbtrfsutils: follow main package versioning (5.9)
      * add pkg-config file definitions
   * python-btrfsutil: follow main package versioning (5.9)
   * inspect tree-stats: print node counts for each level, fanout
   * other:
      * docs:
         * remove obsolete mount options (alloc_start, subvolrootid)
         * deleting default subvolume is not permitted
      * updated or fixed tests
      * .editorconfig updates
      * move files to kernel-shared/
      * CI:
         * updated to use zstd 1.4.5
         * fix reiserfs build
         * more builds with asan, ubsan
      * sb-mod updates
      * build:
         * print .so versions of libraries in configure summary

btrfs-progs-5.8 (skipped)
-------------------------

btrfs-progs-5.7 (2020-07-02)
----------------------------
   * mkfs:
      * new option to enable features otherwise enabled at runtime, now
        implemented for quotas, 'mkfs.btrfs -R quota'
      * fix space accounting for small image, DUP and --rootdir
      * option -A removed
   * check: detect ranges with overlapping csum items
   * fi usage: report correct numbers when plain RAID56 profiles are used
   * convert: ensure the data chunks size never exceed device size
   * libbtrfsutil: update documentation regarding subvolume deletion
   * build: support libkcapi as implementation backend for cryptographic
     primitives
   * core: global options for verbosity (-v, -q), subcommands -v or -q are
     aliases and will continue to work but are considered deprecated,
     current command output is preserved to keep scripts working
   * other:
      * block group code cleanups
      * build warning fixes
      * more files moved to kernel-shared
      * btrfs-debugfs ported to python 3
      * documentation updates
      * new tests

btrfs-progs-5.6 (2020-04-05)
----------------------------
   * inspect logical-resolve: support LOGICAL_INO_V2 as new option '-o',
     helps advanced dedupe tools
   * inspect: user larger buffer (64K) for results
   * subvol delete: support deletion by id (requires kernel 5.7+)
   * libbtrfsutil:
      * support subvolume deletion by id
      * bump version to 1.2
      * library symbols are now versioned
   * dump-tree: new option --hide-names, replace any names (file, directory,
     subvolume, xattr) in the output with stubs
   * convert: warn if the filesystem is not mountable on the machine
   * fixes:
      * restore: proper mirror iteration on decompression error
      * restore: make symlink messages less noisy
      * check: handle holes at the beginning or end of file
      * fix xxhash output on big endian machines
      * receive: fix lookup of subvolume by uuid in case it was already
        received before
   * other:
      * new and updated tests
      * add missing binaries in exported testsuite
      * docs updates
      * remove obsolete files
      * move files to more appropriate directories
      * fixes reported by valgrind
      * many typos fixed

btrfs-progs-5.6.1 (2020-05-07)
""""""""""""""""""""""""""""""
   * print warning when multiple block group profiles exist, update 'fi usage'
     summary, add docs to maual page explaining the situation
   * build: optional support for libgcrypt or libsodium, providing hash
     implementations
   * other:
      * fixed, updated and new tests
      * cleanups
      * updated docs

btrfs-progs-5.5 (skipped)
-------------------------

btrfs-progs-5.4 (2019-12-03)
----------------------------
   * support new hash algorithms (kernel 5.5):
      * mkfs.btrfs and btrfs-convert with --csum, crc32c, xxhash, sha256, blake2
   * mkfs: support new raid1c3 and raid1c4 block group profiles (kernel 5.5)
   * check:
      * --repair delays start with a warning, can be skipped using --force
      * enhanced detection of inode types from partial data, more options for
        repair
   * receive: fix quiet option
   * image: speed up chunk loading
   * fi usage:
      * sort devices by id
      * print ratio of used/total per block group type
   * rescue zero-log: reset the log pointers directly, avoid reading some other
     potentially damaged structures
   * new make target install-static to install only static binaries/libraries
   * other
      * docs updates
      * new tests
      * cleanups and refactoring

btrfs-progs-5.4.1 (2020-01-09)
""""""""""""""""""""""""""""""
   * build: fix docbook5 build
   * check: do extra verification of extent items, inode items and chunks
   * qgroup: return ENOTCONN if quotas not running (needs updated kernel)
   * other: various test fixups

btrfs-progs-5.3 (2019-10-21)
----------------------------
   * mkfs:
      * new option to specify checksum algorithm (only crc32c)
      * fix xattr enumeration
   * dump-tree: BFS (breadth-first) traversal now default
   * libbtrfsutil: remove stale BTRFS_DEV_REPLACE_ITEM_STATE_x defines
   * ci: add support for gitlab
   * other:
      * preparatory work for more checksum algorithms
      * docs update
      * switch to docbook5 backend for asciidoc
      * fix build on uClibc due to missing backtrace()
      * lots of printf format fixups

btrfs-progs-5.3.1 (2019-10-25)
""""""""""""""""""""""""""""""
   * libbtrfs: fix link breakage due to missing symbols

btrfs-progs-5.2 (2019-07-05)
----------------------------
   * subvol show: print qgroup information when available
   * scrub:
      * status: show ETA, revamp the whole output
      * fix reading/writing of last position on resume/cancel, potentially
        skipping part of the filesystem on next resume
   * dump-tree: add new option --noscan to use only devices given on the
     commandline
   * all-in-one binary (busybox style) with mkfs.btrfs, btrfs-image,
     btrfs-convert, btrfstune
   * image: fix hang when there are more than 32 cpus online and compression is
     requested
   * convert: fix some false ENOSPC errors when --rootdir is used
   * build: fix gcc9 warnings
   * core changes
      * command handling cleanups
      * dead code removal
      * cmds-* files moved to cmds/
      * other shared userspace files moved to common/
      * utils.c split into more files
      * preparatory work for more output formats
      * libbtrfsutil: fix unaligned access
   * other
      * new and updated tests
      * fix tests so CI passes again
      * sb-mod can modify more superblock items

btrfs-progs-5.2.1 (2019-07-26)
""""""""""""""""""""""""""""""
   * scrub status: fix ETA calculation after resume
   * check: fix crash when using -Q
   * restore: fix symlink owner restoration
   * mkfs: fix regression with mixed block groups
   * core: fix commit to process all delayed refs
   * other:
      * minor cleanups
      * test updates

btrfs-progs-5.2.2 (2019-09-05)
""""""""""""""""""""""""""""""
   * check:
      * fix false report of wrong byte count for orphan inodes
      * option -E was not handled correctly
      * new check and repair for root item generation
   * balance: check for full-balance before background fork
   * mkfs: check that total device size does not overflow 16EiB
   * dump-tree: print DEV_STATS key type
   * other:
      * new and updated tests
      * doc fixups and updates

btrfs-progs-5.1 (2019-05-17)
----------------------------
   * (version 5.0 skipped)
   * check:
      * repair: flush/FUA support to avoid breaking metadata COW
      * file extents repair no longer relies on data in extent tree
      * lowmem: fix false error reports about gaps between extents
      * add inode mode check and repair for various objects
      * add check for invalid combination of nocow/compressed extents
   * device scan: new option to forget scanned devices
   * mkfs: use same chunk size as kernel for initial creation
   * dev-replace: better report when other exclusive operation is running
   * help: for syntax errors on command line, print only the relevant messages,
     not the whole help text
   * receive:
      * new option for quiet mode
      * on -vv print information about written ranges
      * fix endless loop with --dump on an invalid stream
   * defrag: able open files in RO mode (needs kernel support to work)
   * dump-tree: --block can be specified multiple times
   * libbtrfsutil: fix: don't close fd on error in btrfs_util_subvolume_id_fd
   * core:
      * add sync before superblock write
      * better error handling on the transaction commit path
      * try to find best copy when reading tree blocks
      * update backup roots on commit transaction
   * other:
      * fuzz tests pass and are enabled in CI
      * cleanups
      * new tests

btrfs-progs-5.1.1 (2019-06-11)
""""""""""""""""""""""""""""""
   * convert and mkfs will try to use optimized crc32c
   * fi show: accept a file-backed image
   * fi show: fix possible crash when device is deleted in parallel
   * build:
      * support extra flags for python bindings
      * separate LDFLAGS for libbtrfsutil
   * other:
      * space reservation fixes or debugging improvements
      * V0 extent code removed
      * more tests and cleanups

btrfs-progs-4.x (2019-02-25)
----------------------------

btrfs-progs-4.20 (2019-01-19)
"""""""""""""""""""""""""""""
   * new feature: metadata uuid
      * lightweight change of UUID without rewriting all metadata
        (incompatible change)
      * done by btrfstune -m/-M
      * needs kernel support, 5.0+
   * image:
      * fix block groups when restoring from multi-device image
      * only enlarge result image if it's a regular file
   * check
      * more device extent checks and fixes
      * can repair dir item with mismatched hash
   * mkfs: uuid tree created with proper contents
   * fix mount point detection due to partial prefix match
   * other:
      * new tests
      * libbtrfsutil: fix tests if kernel lacks support for new subvolume ioctls
      * build fixes
      * doc fixes

btrfs-progs-4.20.1 (2019-01-23)
   * libbtrfs: fix build of external tools due to missing symbols
   * ci: enable library test

btrfs-progs-4.20.2 (2019-02-25)
   * ci: use newer distro for builds
   * dump-super: minor output fixup
   * revert fix for prefix detection of receive path, this is temporary and
     unbreaks existing user setups

btrfs-progs-4.19 (2018-11-03)
"""""""""""""""""""""""""""""
   * check: support repair of fs with free-space-tree feature
   * core:
      * port delayed ref infrastructure from kernel
      * support write to free space tree
   * dump-tree: new options for BFS and DFS enumeration of b-trees
   * quota: rescan is now done automatically after 'assign'
   * btrfstune: incomplete fix to uuid change
   * subvol: fix 255 char limit checks
   * completion: complete block devices and now regular files too
   * docs:
      * ship uncompressed manual pages
      * btrfsck uses a manual page link instead of symlink
   * other
      * improved error handling
      * docs
      * new tests

btrfs-progs-4.19.1 (2018-12-05)
   * build fixes
      * big-endian builds fail due to bswap helper clashes
      * 'swap' macro is too generic, renamed to prevent build failures
   * libbtrfs
      * minor version update to 1.1.0
      * fix default search to top=0 as documented
      * rename 'async' to avoid future python binding problems
      * add support for unprivileged subvolume listing ioctls
      * added tests, API docs
   * other
      * lot of typos fixed
      * warning cleanups
      * doc formatting updates
      * CI tests against zstd 1.3.7

btrfs-progs-4.18 (skipped)
""""""""""""""""""""""""""

btrfs-progs-4.17 (2018-06-14)
"""""""""""""""""""""""""""""
   * check
      * many lowmem mode improvements
      * properly report qgroup mismatch errors
      * check symlinks with append/immutable flags
   * fi usage
      * correctly calculate allocated/unallocated for raid10
      * minor output updates
   * mkfs
      * detect ENOSPC on thinly provisioned devices
      * fix spurious EEXIST during directory traversal
   * restore: fix relative path for restore target
   * dump-tree: print symbolic tree names for backrefs
   * send: fix regression preventing send -p with subvolumes mounted on "/"
   * corrupt-tree: refactoring and command line updates
   * build
      * make it work with e2fsprogs < 1.42 again
      * restore support for autoconf 2.63
      * detect if -std=gnu90 is supported
   * other
      * new tests
      * cleanups

btrfs-progs-4.17.1 (2018-08-06)
   * check:
      * add ability to fix wrong ram_bytes for compressed inline files
      * beautify progress output
   * btrfstune: allow to continue uuid change after unclean interruption
   * several fuzz fixes:
      * detect overlapping chunks
      * chunk loading error handling
      * don't crash with unexpected root refs to extents
   * relax option parsing again to allow mixing options and non-options
     arguments
   * fix qgroup rescan status reporting
   * build:
      * drop obsolete dir-test
      * new configure option to disable building of tools
      * add compatibility options --disable-static and --disable-shared
   * other:
      * cleanups and preparatory work
      * new test images

btrfs-progs-4.16 (2018-04-06)
"""""""""""""""""""""""""""""
   * libbtrfsutil - new LGPL library to wrap userspace functionality
      * several 'btrfs' commands converted to use it:
         * properties
         * filesystem sync
         * subvolume set-default/get-default/delete/show/sync
      * python bindings, tests
   * build
      * use configured pkg-config path
      * CI: add python, musl/clang, built dependencies caching
      * convert: build fix for e2fsprogs 1.44+
      * don't install library links with wrong permissions
   * fixes
      * prevent incorrect use of subvol_strip_mountpoint
      * dump-super: don't verify csum for unknown type
      * convert: fix inline extent creation condition
   * check:
      * lowmem: fix false alert for 'data extent backref lost for snapshot'
      * lowmem: fix false alert for orphan inode
      * lowmem: fix false alert for shared prealloc extents
   * mkfs:
      * add UUID and otime to root of FS_TREE - with the uuid, snapshots will
	be now linked to the toplevel subvol by the parent UUID
      * don't follow symlinks when calculating size
      * pre-create the UUID tree
      * fix --rootdir with selinux enabled
   * dump-tree: add option to print only children nodes of a given block
   * image: handle missing device for RAID1
   * other
      * new tests
      * test script cleanups (quoting, helpers)
      * tool to edit superblocks
      * updated docs

btrfs-progs-4.16.1 (2018-04-24)
   * remove obsolete tools: btrfs-debug-tree, btrfs-zero-log, btrfs-show-super,
     btrfs-calc-size
   * sb-mod: new debugging tool to edit superblock items
   * mkfs: detect if thin-provisioned device does not have enough space
   * check: don't try to verify checksums on metadata dump images
   * build: fail documentation build if xmlto is not found
   * build: fix build of btrfs.static

btrfs-progs-4.15 (2018-02-01)
"""""""""""""""""""""""""""""
   * mkfs --rootdir reworked, does not minimize the final image but can be still
     done using a new option --shrink
   * fix allocation of system chunk, don't allocate from the reserved area
   * other
      * new and updated tests
      * cleanups, refactoring
      * doc updates

btrfs-progs-4.15.1 (2018-02-16)
   * build
      * fix build on musl
      * support asciidoctor for doc generation
   * cleanups
      * sync some code with kernel
      * check: move code to own directory, split to more files
   * tests
      * more build tests in travis
      * tests now pass with asan and ubsan
      * testsuite can be exported and used separately

btrfs-progs-4.14 (2017-11-16)
"""""""""""""""""""""""""""""
   * build: libzstd now required by default
   * check: more lowmem mode repair enhancements
   * subvol set-default: also accept path
   * prop set: compression accepts no/none, same as ""
   * filesystem usage: enable for filesystem on top of a seed device
   * rescue: new command fix-device-size
   * other
      * new tests
      * cleanups and refactoring
      * doc updates

btrfs-progs-4.14.1 (2018-01-05)
   * dump-tree: print times of root items
   * check: fix several lowmem mode bugs
   * convert: fix rollback after balance
   * other
      * new and updated tests, enabled lowmem mode in CI
      * docs updates
      * fix travis CI build
      * build fixes
      * cleanups

btrfs-progs-4.13 (2017-09-08)
"""""""""""""""""""""""""""""
   * convert: reiserfs support
   * check: new option --force to allow check of a mounted filesystem (no repair)
   * mkfs: --rootdir will now copy special files
   * dump-tree: minor output changes
   * inspect rootid: accept file as argument
   * dev usage: don't calculate slack space for missing devices
   * fi du: don't print error on EMPTY_SUBVOL (inode number 2)
   * build:
      * fixed support for sanitization features on gcc (tsan, asan, ubsan)
      * fix PIE build
   * other:
      * misc cleanups and stability fixes
      * travis CI enhancements
      * new tests, fuzzed images
      * testsuite cleanups

btrfs-progs-4.13.1 (2017-09-25)
   * image: speed up generating the sanitized names, do not generate unprintable chars
   * completion: add missing commands, better mount point detection
   * restore: add zstd support; libzstd detected automatically, will be
     requested by default in the future, or can be configured out
   * other:
      * misc fixes found by sparse
      * doc enhancements, ioctl manual page started
      * updated and new tests
      * build fixes

btrfs-progs-4.13.2 (2017-10-06)
   * subvol list:
      * don't list toplevel subvolume among deleted (broken since 4.8.3)
      * minor adjustments of uuid print format
   * subvol delete:
      * fix swapped behaviour of --commit-each and --commit-after
      * fix potentially lost sync if subvolumes are from different filesystems
   * check: add cache for metadata blocks, should improve performance
   * other:
      * new tests, testsuite updates
      * doc updates
      * cleanups

btrfs-progs-4.13.3 (2017-10-16)
   * check: fix --force, wrong check for a mounted block device
   * build: fix --with-convert parsing
   * subvol list: don't list TOPLEVEL
   * other: update tests

btrfs-progs-4.12 (2017-07-26)
"""""""""""""""""""""""""""""
   * subvol show: new options --rootid, --uuid to show subvol by the given spec
   * convert: progress report fixes, found by tsan
   * image: progress report fixes, found by tsan
   * fix infinite looping in find-root, or when looking for free extents
   * other:
      * code refactoring
      * docs updates
      * build: ThreadSanitizer support
      * tests: stricter checks for mounted filesystem

btrfs-progs-4.12.1 (2017-08-25)
   * build:
      * fix cross-compilation
      * use gnu90 explicitly
   * dump-tree: more relaxed checks so -b can print block on a damaged fs
   * convert: fix the 1MB range exclusion
   * check: more dir_item hash checks
   * other
      * added missing getopt spec for some options
      * doc fixes
      * cleanups
      * test updates

btrfs-progs-4.11 (2017-05-18)
"""""""""""""""""""""""""""""
   * receive: fix handling empty stream with -e (multi-stream)
   * send dump: fix printing long file names
   * stability fixes for: dump-super, print-tree, check
   * option parser updates: global options are parsed before the subcommand name
     (old xfstests will fail)
   * new and updated tests
   * documentation updates

btrfs-progs-4.11.1 (2017-06-30)
   * image: restoring from multiple devices
   * dev stats: make --check option work
   * check: fix false alert with extent hole on a NO_HOLE filesystem
   * check: lowmem mode, fix false alert in case of mixed inline and compressed
     extent
   * convert: work with large filesystems (many TB)
   * convert: fix overwriting of eb header flags
   * convert: do not clear NODATASUM flag in inodes when run with --no-datasum
   * docs updates
   * build: sync Android.mk with Makefile
   * tests:
      * new tests
      * fix 008 and 009, shell quotation mistake

btrfs-progs-4.10 (2017-03-08)
"""""""""""""""""""""""""""""
   * send: dump output fixes: missing newlies
   * check: several fixes for the lowmem mode, improved error reporting
   * build
      * removed some library deps for binaries that not use them
      * ctags, cscope
      * split Makefile to the autotool generated part and the rest, not needed
        to autogen.sh after adding a file
   * shared code: sync easy parts with kernel sources
   * other
      * lots of cleanups
      * source file reorganization: convert, mkfs, utils
      * lots of spelling fixes in docs, other updates
      * more tests

btrfs-progs-4.10.1 (2017-03-17)
   * receive: handle subvolume in path clone
   * convert: rollback fixed (rewrite was needed to address previous design issues)
   * build: fix build of 3rd party tools, missing <linux/sizes.h>
   * dump-tree: print log trees
   * other
      * new and updated tests

btrfs-progs-4.10.2 (2017-03-31)
   * check: lowmem mode fix for false alert about lost backrefs
   * convert: minor bugfix
   * library: fix build, missing symbols, added tests

btrfs-progs-4.9 (2016-12-23)
""""""""""""""""""""""""""""
   * check: many lowmem mode updates
   * send: use splice syscall to copy buffer from kernel
   * receive: new option to dump the stream in textual form
   * convert:
      * move sources to own directory
      * prevent accounting of blocks beyond end of the device
      * make it work with 64k sectorsize
   * mkfs: move sources to own directory
   * defrag: warns if directory used without -r
   * dev stats:
      * new option to check stats for non-zero values
      * add long option for -z
   * library: version bump to 0.1.2, added subvol_uuid_search2
   * other:
      * cleanups
      * docs updates

btrfs-progs-4.9.1 (2017-01-27)
   * check:
      * use correct inode number for lost+found files
      * lowmem mode: fix false alert on dropped leaf
   * size reports: negative numbers might appear in size reports during device
     deletes (previously in EiB units)
   * mkfs: print device being trimmed
   * defrag: v1 ioctl support dropped
   * quota: print message before starting to wait for rescan
   * qgroup show: new option to sync before printing the stats
   * other:
      * corrupt-block enhancements
      * backtrace and co. cleanups
      * doc fixes

btrfs-progs-4.8 (2016-10-05)
""""""""""""""""""""""""""""
   * error handling improvements all over the place
   * new fuzzed images, test updates
   * doc fixups
   * minor cleanups and improvements
   * kernel library helpers moved to own directory
   * qgroup: fix regression leading to incorrect status after check,
     introduced in 4.7

btrfs-progs-4.8.1 (2016-10-12)
   * 32bit builds fixed
   * build without backtrace support fixed

btrfs-progs-4.8.2 (2016-10-26)
   * convert: also convert file attributes
   * convert: fix wrong tree block alignment for unaligned block group
   * check: quota verify fixes, handle reloc tree
   * build: add stub for FIEMAP_EXTENT_SHARED, compiles on ancient kernels
   * build: add stub for BUILD_ASSERT when ioctl.h is included
   * dump-tree: don't crash on unrecognized tree id for -t
   * tests:
      * add more ioctl tests
      * convert: more symlink tests, attribute tests
      * quota verify for reloc tree
   * other cleanups

btrfs-progs-4.8.3 (2016-11-11)
   * check:
      * support for clearing space cache (v1)
      * size reduction of inode backref structure
   * send:
      * fix handling of multiple snapshots (-p and -c options)
      * transfer buffer increased (should reduce number of context switches)
      * reuse existing file for output (-f), eg. when root cannot create files (NFS)
   * dump-tree:
      * print missing items for various structures
      * new: dev stats, balance status item
      * sync key names with kernel (the persistent items)
   * subvol show: now able to print the toplevel subvolume -- the creation time
     might be wrong though
   * mkfs:
      * store the creation time of toplevel root inode
      * print UUID in the summary
   * build: travis CI for devel
   * other:
      * lots of cleanups and refactoring
      * switched to on-stack path structure
      * fixes from coverity, asan, ubsan
      * new tests
      * updates in testing infrastructure
      * fixed convert test 005

btrfs-progs-4.8.4 (2016-11-25)
   * check: support for clearing space cache v2 (free-space-tree)
   * send:
      * more sanity checks (with tests), cleanups
      * fix for fstests/btrfs/038 and btrfs/117 failures
   * build:
      * fix compilation of standalone ioctl.h, pull NULL definition
      * fix library link errors introduced in 4.8.3
   * tests:
      * add more fuzzed images from bugzilla
      * add bogus send stream checks
      * fixups and enhancements for CI environment builds
      * misc refinements and updates of testing framework
   * other:
      * move sources for btrfs-image to own directory
      * deprecated and not build by default: btrfs-calc-size, btrfs-show-super
      * docs updates

btrfs-progs-4.8.5 (2016-11-30)
   * receive: fix detection of end of stream (error reported even for valid
     streams)
   * other:
      * added test for the receive bug
      * fix linking of library-test

btrfs-progs-4.7 (2016-07-29)
""""""""""""""""""""""""""""
   * convert: fix creating discontig extents
   * check: speed up traversing heavily reflinked extents within a file
   * check: verify qgroups of higher levels
   * check: repair can now fix wrong qgroup numbers
   * balance: new option to run in the background
   * defrag: default extent target size changed to 32MiB
   * du: silently skip non-btrfs dirs/files
   * documentation updates: btrfs(5), btrfs(8), balance, subvolume, scrub,
     filesystem, convert
   * bugfixes:
      * unaligned access (reported for sparc64) in raid56 parity calculations
      * use /bin/bash
      * other stability fixes and cleanups
   * more tests

btrfs-progs-4.7.1 (2016-08-25)
   * check:
      * new optional mode: optimized for low memory usage (memory/io tradeoff)
      * --mode=lowmem, not default, still considered experimental
      * does not work with --repair yet
   * convert: regression fix, ext2_subvol/image rw permissions
   * mkfs/convert:
      * two-staged creation, partially created filesystem will not be recognized
      * improved error handling (fewer BUG_ONs)
   * convert: preparation for more filesystems to convert from
   * documentation updates: quota, qgroup
   * other
      * message updates
      * more tests
      * more build options, enhanced debugging

btrfs-progs-4.7.2 (2016-09-05)
   * check:
      * urgent fix: false report of backref mismatches; do not --repair
        last unaffected version 4.6.1 (code reverted to that state)
   * fuzzing and fixes
      * added more sanity checks for various structures
      * testing images added
   * build: udev compatibility: do not install .rules on version < 190
   * other:
      * dump-super: do not crash on garbage value in csum_type
      * minor improvements in messages and help strings
   * documentation:
      * filesystem features

btrfs-progs-4.7.3 (2016-09-21)
   * fixed free space tree compat status
   * check: low-mem mode: handle partially dropped snapshots
   * dump-super: consolidate options for superblock copy
   * tree-stats: check mount status
   * subvol delete: handle verbosity option
   * defrag: print correct error string
   * mkfs: fix reading rotational status
   * other:
      * UBSAN build option
      * documentation updates
      * enhanced tests: convert, fuzzed images, more tools to run on fuzzed
        images

btrfs-progs-4.6 (2016-06-10)
""""""""""""""""""""""""""""
   * convert - major rewrite:
      * fix a long-standing bug that led to mixing data blocks into metadata block
        groups
      * the workaround was to do full balance after conversion, which was
        recommended practice anyway
      * explicitly set the lowest supported version of e2fstools to 1.41
   * provide and install udev rules file that addresses problems with device
     mapper devices, renames after removal
   * send: new option: quiet
   * dev usage: report slack space (device size minus filesystem area on the dev)
   * image: support DUP
   * build: short options to enable debugging builds
   * other:
      * code cleanups
      * build fixes
      * more tests and other enhancements

btrfs-progs-4.6.1 (2016-06-24)
   * filesystem resize: negative resize argument accepted again
   * qgroup rescan: fix skipping when rescan is in progress
   * mkfs: initialize stripesize to correct value
   * testsuite updates, mostly convert tests
   * documentation updates
      * btrfs-device, btrfs-restore manual pages enhanced
      * misc fixups

btrfs-progs-4.5 (2016-03-20)
""""""""""""""""""""""""""""
  New/moved commands:
     * btrfs-show-super -> btrfs inspect-internal dump-super
     * btrfs-debug-tree -> btrfs inspect-internal dump-tree

  New commands:
     * btrfs filesystem 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 (2016-03-31)
   * mkfs: allow DUP on multi-device filesystems
   * bugfixes: build fixes, assorted other fixes

btrfs-progs-4.5.2 (2016-05-02)
   * new/moved command: btrfs-calc-stats -> btrfs inspect tree-stats
   * check: fix false alert for metadata blocks crossing stripe boundary
   * check: catch when qgroup numbers mismatch
   * check: detect running quota rescan and report mismatches
   * balance start: add safety delay before doing a full balance
   * filesystem sync: is now silent
   * filesystem show: don't miss filesystems with partially matching uuids
   * dev ready: accept only one argument for device
   * dev stats: print "devid:N" for a missing device instead of "(null)"
   * other:
      * lowest supported version of e2fsprogs is 1.41
      * minor cleanups, test updates

btrfs-progs-4.5.3 (2016-05-11)
   * ioctl: fix unaligned access in buffer from TREE_SEARCH; might cause SIGBUS
     on architectures that do not support unaligned access and do not performa
     any fixups
   * improved validation checks of superblock and chunk-related structures
   * subvolume sync: fix handling of -s option
   * balance: adjust timing of safety delay countdown with --full-balance
   * rescue super-recover: fix reversed condition check
   * check: fix bytes_used accounting
   * documentation updates: mount options, scrub, send, receive, select-super,
     check, mkfs
   * testing: new fuzzed images, for superblock and chunks

btrfs-progs-4.4 (2016-01-18)
""""""""""""""""""""""""""""
  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

  Note: 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 detected during cross-compilation
     * debug-tree: option -t understands ids for tree root and chunk 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 (2016-02-26)
   * 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 (2015-11-06)
""""""""""""""""""""""""""""
   * 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
   * filesystem 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: enhanced 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 instrumentation (eg valgrind)
      * print commands if requested
      * add README for tests

btrfs-progs-4.3.1 (2015-11-16)
   * 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 (2015-09-03)
""""""""""""""""""""""""""""
   * 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 (2015-09-20)
   * 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 (2015-10-05)
   * filesystem 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
   * filesystem usage: print summary for non-root users

btrfs-progs-4.2.3 (2015-10-19)
   * subvol sync: make it actually work again: it's been broken since 4.1.2,
     due to a reversed condition it returned immediately 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 (2015-06-22)
""""""""""""""""""""""""""""
  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:
     * rescue 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 (2015-07-10) -- 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
     * corrupt-block: let it kill nbytes

btrfs-progs-4.1.2 (2015-07-14)
   * urgent bugfix: mkfs creates invalid filesystem, must be recreated

btrfs-progs-4.0 (2015-04-29)
""""""""""""""""""""""""""""
   * 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 (2015-05-20)
   * 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.x (2015-03-25)
----------------------------

btrfs-progs-3.19 (2015-03-11)
"""""""""""""""""""""""""""""
   * 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 (2015-03-25)
   * 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
   * filesystem 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 (2014-12-30)
"""""""""""""""""""""""""""""
   * 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 'filesystem 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 (2015-01-09)
   * minor fixes
   * documentation updates

btrfs-progs-3.18.2 (2015-01-27)
   * 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
   * filesystem 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 (2014-10-17)
"""""""""""""""""""""""""""""
   * 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 (2014-11-04)
   * filesystem df: argument handling
   * fix linking with libbtrfs
   * replace: better error reporting
   * filesystem show: fixed stall if run concurrently with balance
   * check: fixed argument parsing for --subvol-extents
   * filesystem df: SI prefixes corrected

btrfs-progs-3.17.2 (2014-11-19)
   * 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 (2014-12-04)
   * 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 (2014-08-26)
"""""""""""""""""""""""""""""
   * 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 (2014-09-15)
   * print GlobalReserve in filesystem 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 (2014-10-01)
   * a few fixes in fsck and image tools

btrfs-progs-3.15 (skipped)
""""""""""""""""""""""""""

btrfs-progs-3.14 (2014-04-06)
"""""""""""""""""""""""""""""
   * 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 (2014-04-18)
   * properties: fix handling of option -t
   * restore: fix reading of compressed extents
   * minor code and doc updates

btrfs-progs-3.14.2 (2014-05-29)
   * documentation is now written in asciidoc and there are manpages for each
     subcommand
   * misc bugfixes

btrfs-progs-3.13 (skipped)
""""""""""""""""""""""""""

btrfs-progs-3.12 (2013-11-25)
"""""""""""""""""""""""""""""
   * announcement, tarballs
   * first release after 0.19 (2009/06) with a lot of changes