Search notes:

/sys/fs/btrfs/{fs-guid}

«Files» and «directories» I've encountered under /sys/fs/btrfs/{fs-guid} include:
allocation
bdi/ A sym link
bg_reclaim_threshold
checksum When a filesystem is mounted the implementation backing the checksums is logged
clone_alignment
commit_stats Number of commits and time related statistics.
devices/
devinfo/
discard/
exclusive_operation
features/
generation
label
metadata_uuid
nodesize
quota_override
read_policy
sectorsize

See also

The parent directory /sys/fs/btrfs

Index

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