btrfs: sysfs: export supported checksums
Export supported checksum algorithms via sysfs in the list of static features: /sys/fs/btrfs/features/supported_checksums Space spearated list of checksum algorithm names. Co-developed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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