buildroot/fs/btrfs/Config.in

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config BR2_TARGET_ROOTFS_BTRFS
bool "btrfs root filesystem"
select BR2_PACKAGE_HOST_BTRFS_PROGS
help
Build a btrfs root filesystem. If you enable this option, you
probably want to enable the btrfs-progs package too.
if BR2_TARGET_ROOTFS_BTRFS
config BR2_TARGET_ROOTFS_BTRFS_LABEL
string "filesystem label"
config BR2_TARGET_ROOTFS_BTRFS_SIZE
string "filesystem size"
default "100m"
help
The size of the filesystem image in bytes.
Suffix with k, m, g or t for power-of-two kilo-, mega-, giga-
or terabytes.
config BR2_TARGET_ROOTFS_BTRFS_SIZE_SECTOR
string "sector size"
default "4096"
help
This value should be set to the page size in bytes. The
default value of 4096 is the the most common page size for
most systems. If the sectorsize differs from the page size,
the created filesystem may not be mountable by the kernel.
Therefore it is recommended to leave this value at
4096. Unless you know that your kernel uses a different page
size. Suffix with k for power-of-two kilobytes.
config BR2_TARGET_ROOTFS_BTRFS_SIZE_NODE
string "btree node size"
default "16384"
help
The tree block size in which btrfs stores metadata in bytes.
This must be a multiple of the sectorsize, but not larger
than 64KiB (65536).
Suffix with k for power-of-two kilobytes.
config BR2_TARGET_ROOTFS_BTRFS_FEATURES
string "Filesystem Features"
help
A comma separated string of features that can be enabled
during creation time.
For a list of available options, use:
`.../host/bin/mkfs.btrfs -O list-all`
endif # BR2_TARGET_ROOTFS_BTRFS