Features that can be enabled during creation time. See also
btrfs(5) section FILESYSTEM FEATURES.
mixed-bg
(kernel support since 2.6.37)
mixed data and metadata block groups, also set by option
--mixed
extref
(default since btrfs-progs 3.12, kernel support since 3.7)
increased hardlink limit per file in a directory to 65536,
older kernels supported a varying number of hardlinks
depending on the sum of all file name sizes that can be
stored into one metadata block
raid56
(kernel support since 3.9)
extended format for RAID5/6, also enabled if raid5 or raid6
block groups are selected
skinny-metadata
(default since btrfs-progs 3.18, kernel support since 3.10)
reduced-size metadata for extent references, saves a few
percent of metadata
no-holes
(kernel support since 3.14)
improved representation of file extents where holes are not
explicitly stored as an extent, saves a few percent of
metadata if sparse files are used
zoned
(kernel support since 5.12)
zoned mode, data allocation and write friendly to
zoned/SMR/ZBC/ZNS devices, see ZONED MODE in btrfs(5), the
mode is automatically selected when a zoned device is
detected
