block: remove QUEUE_FLAG_DISCARD

[linux-block.git] / include / linux / t10-pi.h

diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h
index a4b1af581f69ec055fbc0828765fad10bfd62a8e..248f4ac9564258524cd2ea897252023718c415fe 100644 (file)
--- a/include/linux/t10-pi.h
+++ b/include/linux/t10-pi.h
@@ -59,6 +59,15 @@ struct crc64_pi_tuple {
        __u8   ref_tag[6];
 };
 
+/**
+ * lower_48_bits() - return bits 0-47 of a number
+ * @n: the number we're accessing
+ */
+static inline u64 lower_48_bits(u64 n)
+{
+       return n & ((1ull << 48) - 1);
+}
+
 static inline u64 ext_pi_ref_tag(struct request *rq)
 {
        unsigned int shift = ilog2(queue_logical_block_size(rq->q));