f2fs: expose features to sysfs entry
This patch exposes what features are supported by current f2fs build to sysfs entry via: /sys/fs/f2fs/features/ /sys/fs/f2fs/dev/features Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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