1 files changed, 153 insertions, 0 deletions
diff --git a/include/linux/blk-integrity.h b/include/linux/blk-integrity.h
new file mode 100644
index 000000000000..c7eae0bfb013
--- /dev/null
+++ b/include/linux/blk-integrity.h
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_BLK_INTEGRITY_H
+#define _LINUX_BLK_INTEGRITY_H
+
+#include <linux/blk-mq.h>
+#include <linux/bio-integrity.h>
+
+struct request;
+
+enum blk_integrity_flags {
+	BLK_INTEGRITY_NOVERIFY		= 1 << 0,
+	BLK_INTEGRITY_NOGENERATE	= 1 << 1,
+	BLK_INTEGRITY_DEVICE_CAPABLE	= 1 << 2,
+	BLK_INTEGRITY_REF_TAG		= 1 << 3,
+	BLK_INTEGRITY_STACKED		= 1 << 4,
+};
+
+const char *blk_integrity_profile_name(struct blk_integrity *bi);
+bool queue_limits_stack_integrity(struct queue_limits *t,
+		struct queue_limits *b);
+static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t,
+		struct block_device *bdev)
+{
+	return queue_limits_stack_integrity(t, &bdev->bd_disk->queue->limits);
+}
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
+int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
+int blk_rq_integrity_map_user(struct request *rq, void __user *ubuf,
+			      ssize_t bytes);
+
+static inline bool
+blk_integrity_queue_supports_integrity(struct request_queue *q)
+{
+	return q->limits.integrity.tuple_size;
+}
+
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
+{
+	if (!blk_integrity_queue_supports_integrity(disk->queue))
+		return NULL;
+	return &disk->queue->limits.integrity;
+}
+
+static inline struct blk_integrity *
+bdev_get_integrity(struct block_device *bdev)
+{
+	return blk_get_integrity(bdev->bd_disk);
+}
+
+static inline unsigned short
+queue_max_integrity_segments(const struct request_queue *q)
+{
+	return q->limits.max_integrity_segments;
+}
+
+/**
+ * bio_integrity_intervals - Return number of integrity intervals for a bio
+ * @bi:		blk_integrity profile for device
+ * @sectors:	Size of the bio in 512-byte sectors
+ *
+ * Description: The block layer calculates everything in 512 byte
+ * sectors but integrity metadata is done in terms of the data integrity
+ * interval size of the storage device.  Convert the block layer sectors
+ * to the appropriate number of integrity intervals.
+ */
+static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
+						   unsigned int sectors)
+{
+	return sectors >> (bi->interval_exp - 9);
+}
+
+static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
+					       unsigned int sectors)
+{
+	return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
+}
+
+static inline bool blk_integrity_rq(struct request *rq)
+{
+	return rq->cmd_flags & REQ_INTEGRITY;
+}
+
+/*
+ * Return the current bvec that contains the integrity data. bip_iter may be
+ * advanced to iterate over the integrity data.
+ */
+static inline struct bio_vec rq_integrity_vec(struct request *rq)
+{
+	return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec,
+				 rq->bio->bi_integrity->bip_iter);
+}
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+static inline int blk_rq_count_integrity_sg(struct request_queue *q,
+					    struct bio *b)
+{
+	return 0;
+}
+static inline int blk_rq_map_integrity_sg(struct request *q,
+					  struct scatterlist *s)
+{
+	return 0;
+}
+static inline int blk_rq_integrity_map_user(struct request *rq,
+					    void __user *ubuf,
+					    ssize_t bytes)
+{
+	return -EINVAL;
+}
+static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
+{
+	return NULL;
+}
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
+{
+	return NULL;
+}
+static inline bool
+blk_integrity_queue_supports_integrity(struct request_queue *q)
+{
+	return false;
+}
+static inline unsigned short
+queue_max_integrity_segments(const struct request_queue *q)
+{
+	return 0;
+}
+
+static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
+						   unsigned int sectors)
+{
+	return 0;
+}
+
+static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
+					       unsigned int sectors)
+{
+	return 0;
+}
+static inline int blk_integrity_rq(struct request *rq)
+{
+	return 0;
+}
+
+static inline struct bio_vec rq_integrity_vec(struct request *rq)
+{
+	/* the optimizer will remove all calls to this function */
+	return (struct bio_vec){ };
+}
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
+#endif /* _LINUX_BLK_INTEGRITY_H */