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由 Jeff Mahoney 提交于
This patch adds the ability to publish supported features to sysfs under /sys/fs/btrfs/features. The files are module-wide and export which features the kernel supports. The content, for now, is just "0\n". Signed-off-by: NJeff Mahoney <jeffm@suse.com> Signed-off-by: NJosef Bacik <jbacik@fusionio.com> Signed-off-by: NChris Mason <clm@fb.com>
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