[PATCH 4/9] block: Define zoned block device operations

@@ -1941,6 +1941,13 @@ generic_make_request_checks(struct bio *bio)
 	case REQ_OP_WRITE_SAME:
 		if (!bdev_write_same(bio->bi_bdev))
 			goto not_supported;
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		if (!bdev_zoned(bio->bi_bdev))
+			goto not_supported;
 		break;
 	default:
 		break;

@@ -202,6 +202,21 @@ void blk_queue_split(struct request_queue *q, struct bio **bio,
 	case REQ_OP_WRITE_SAME:
 		split = blk_bio_write_same_split(q, *bio, bs, &nsegs);
 		break;
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		/*
+		 * For these commands, bi_size is either 0 to specify
+		 * operation on the entire block device sector range,
+		 * or a zone size for operation on a single zone.
+		 * Since a zone size may be much bigger than the maximum
+		 * allowed BIO size, we cannot use blk_bio_segment_split.
+		 */
+		split = NULL;
+		nsegs = 0;
+		break;
 	default:
 		split = blk_bio_segment_split(q, *bio, q->bio_split, &nsegs);
 		break;

@@ -241,11 +256,19 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 	 * This should probably be returning 0, but blk_add_request_payload()
 	 * (Christoph!!!!)
 	 */
-	if (bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_SECURE_ERASE)
-		return 1;
-
-	if (bio_op(bio) == REQ_OP_WRITE_SAME)
+	switch(bio_op(bio)) {
+	case REQ_OP_DISCARD:
+	case REQ_OP_SECURE_ERASE:
+	case REQ_OP_WRITE_SAME:
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
 		return 1;
+	default:
+		break;
+	}
 
 	fbio = bio;
 	cluster = blk_queue_cluster(q);

@@ -69,20 +69,38 @@
  */
 static inline bool bio_has_data(struct bio *bio)
 {
-	if (bio &&
-	    bio->bi_iter.bi_size &&
-	    bio_op(bio) != REQ_OP_DISCARD &&
-	    bio_op(bio) != REQ_OP_SECURE_ERASE)
-		return true;
+	if (!bio || !bio->bi_iter.bi_size)
+		return false;
 
-	return false;
+	switch (bio_op(bio)) {
+	case REQ_OP_DISCARD:
+	case REQ_OP_SECURE_ERASE:
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		return false;
+	default:
+		return true;
+	}
 }
 
 static inline bool bio_no_advance_iter(struct bio *bio)
 {
-	return bio_op(bio) == REQ_OP_DISCARD ||
-	       bio_op(bio) == REQ_OP_SECURE_ERASE ||
-	       bio_op(bio) == REQ_OP_WRITE_SAME;
+	switch (bio_op(bio)) {
+	case REQ_OP_DISCARD:
+	case REQ_OP_SECURE_ERASE:
+	case REQ_OP_WRITE_SAME:
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
+		return true;
+	default:
+		return false;
+	}
 }
 
 static inline bool bio_is_rw(struct bio *bio)

@@ -229,6 +229,26 @@ enum rq_flag_bits {
 #define REQ_HASHED		(1ULL << __REQ_HASHED)
 #define REQ_MQ_INFLIGHT		(1ULL << __REQ_MQ_INFLIGHT)
 
+/*
+ * Note on zone operations:
+ * All REQ_OP_ZONE_* commands do not have a payload and share a common
+ * interface for specifying operation range:
+ * (1) bio->bi_iter.bi_sector and bio->bi_iter.bi_size set to 0:
+ *     the command is to operate on ALL zones of the device.
+ * (2) bio->bi_iter.bi_sector is set to a zone start sector and
+ *     bio->bi_iter.bi_size is set to the zone size in bytes:
+ *     the command is to operate on only the specified zone.
+ * Operation:
+ * REQ_OP_ZONE_REPORT: Request information for all zones or for a single zone.
+ * REQ_OP_ZONE_RESET: Reset the write pointer of all zones or of a single zone.
+ * REQ_OP_ZONE_OPEN: Explicitely open the maximum allowed number of zones or
+ *                   a single zone. For the former case, the zones that will
+ *                   actually be open are chosen by the disk.
+ * REQ_OP_ZONE_CLOSE: Close all implicitely or explicitely open zones or
+ *                    a single zone.
+ * REQ_OP_ZONE_FINISH: Transition one or all open and closed zones to the full
+ *                     condition.
+ */
 enum req_op {
 	REQ_OP_READ,
 	REQ_OP_WRITE,

@@ -236,9 +256,14 @@ enum req_op {
 	REQ_OP_SECURE_ERASE,	/* request to securely erase sectors */
 	REQ_OP_WRITE_SAME,	/* write same block many times */
 	REQ_OP_FLUSH,		/* request for cache flush */
+	REQ_OP_ZONE_REPORT,	/* Get zone information */
+	REQ_OP_ZONE_RESET,	/* Reset a zone write pointer */
+	REQ_OP_ZONE_OPEN,	/* Explicitely open a zone */
+	REQ_OP_ZONE_CLOSE,	/* Close an open zone */
+	REQ_OP_ZONE_FINISH,	/* Finish a zone */
 };
 
-#define REQ_OP_BITS 3
+#define REQ_OP_BITS 4
 
 typedef unsigned int blk_qc_t;
 #define BLK_QC_T_NONE	-1U