block: add a rq_integrity_vec helper
This provides a nice little shortcut to get the integrity data for
drivers like NVMe that only support a single integrity segment.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 84ce76f..3a13fbe 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1559,6 +1559,17 @@ static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
}
+/*
+ * Return the first bvec that contains integrity data. Only drivers that are
+ * limited to a single integrity segment should use this helper.
+ */
+static inline struct bio_vec *rq_integrity_vec(struct request *rq)
+{
+ if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
+ return NULL;
+ return rq->bio->bi_integrity->bip_vec;
+}
+
#else /* CONFIG_BLK_DEV_INTEGRITY */
struct bio;
@@ -1633,6 +1644,11 @@ static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
return 0;
}
+static inline struct bio_vec *rq_integrity_vec(struct request *rq)
+{
+ return NULL;
+}
+
#endif /* CONFIG_BLK_DEV_INTEGRITY */
struct block_device_operations {