btrfs: Add nodiscard mount option.
Add nodiscard mount option to disable discard with remount option. Signed-off-by: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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