scsi: block: remove the cluster flag

Now that the the SCSI layer replaced the use of the cluster flag with
segment size limits and the DMA boundary we can remove the cluster flag
from the block layer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 8 insertions, 18 deletions

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 6b5ad275ed56..4478d53cc6ee 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -194,7 +194,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
 			goto split;
 		}
 
-		if (bvprvp && blk_queue_cluster(q)) {
+		if (bvprvp) {
 			if (seg_size + bv.bv_len > queue_max_segment_size(q))
 				goto new_segment;
 			if (!biovec_phys_mergeable(q, bvprvp, &bv))
@@ -294,7 +294,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 					     bool no_sg_merge)
 {
 	struct bio_vec bv, bvprv = { NULL };
-	int cluster, prev = 0;
+	int prev = 0;
 	unsigned int seg_size, nr_phys_segs;
 	struct bio *fbio, *bbio;
 	struct bvec_iter iter;
@@ -312,7 +312,6 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 	}
 
 	fbio = bio;
-	cluster = blk_queue_cluster(q);
 	seg_size = 0;
 	nr_phys_segs = 0;
 	for_each_bio(bio) {
@@ -324,7 +323,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 			if (no_sg_merge)
 				goto new_segment;
 
-			if (prev && cluster) {
+			if (prev) {
 				if (seg_size + bv.bv_len
 				    > queue_max_segment_size(q))
 					goto new_segment;
@@ -395,9 +394,6 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
 {
 	struct bio_vec end_bv = { NULL }, nxt_bv;
 
-	if (!blk_queue_cluster(q))
-		return 0;
-
 	if (bio->bi_seg_back_size + nxt->bi_seg_front_size >
 	    queue_max_segment_size(q))
 		return 0;
@@ -414,12 +410,12 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
 static inline void
 __blk_segment_map_sg(struct request_queue *q, struct bio_vec *bvec,
 		     struct scatterlist *sglist, struct bio_vec *bvprv,
-		     struct scatterlist **sg, int *nsegs, int *cluster)
+		     struct scatterlist **sg, int *nsegs)
 {
 
 	int nbytes = bvec->bv_len;
 
-	if (*sg && *cluster) {
+	if (*sg) {
 		if ((*sg)->length + nbytes > queue_max_segment_size(q))
 			goto new_segment;
 		if (!biovec_phys_mergeable(q, bvprv, bvec))
@@ -465,12 +461,12 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
 {
 	struct bio_vec bvec, bvprv = { NULL };
 	struct bvec_iter iter;
-	int cluster = blk_queue_cluster(q), nsegs = 0;
+	int nsegs = 0;
 
 	for_each_bio(bio)
 		bio_for_each_segment(bvec, bio, iter)
 			__blk_segment_map_sg(q, &bvec, sglist, &bvprv, sg,
-					     &nsegs, &cluster);
+					     &nsegs);
 
 	return nsegs;
 }
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 696c04c1ab6c..9c8b62f8c180 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -109,7 +109,6 @@ void blk_set_default_limits(struct queue_limits *lim)
 	lim->alignment_offset = 0;
 	lim->io_opt = 0;
 	lim->misaligned = 0;
-	lim->cluster = 1;
 	lim->zoned = BLK_ZONED_NONE;
 }
 EXPORT_SYMBOL(blk_set_default_limits);
@@ -602,8 +601,6 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 	t->io_min = max(t->io_min, b->io_min);
 	t->io_opt = lcm_not_zero(t->io_opt, b->io_opt);
 
-	t->cluster &= b->cluster;
-
 	/* Physical block size a multiple of the logical block size? */
 	if (t->physical_block_size & (t->logical_block_size - 1)) {
 		t->physical_block_size = t->logical_block_size;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 844a454a7b3a..5144707f25ea 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -136,10 +136,7 @@ static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *
 
 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
 {
-	if (blk_queue_cluster(q))
-		return queue_var_show(queue_max_segment_size(q), (page));
-
-	return queue_var_show(PAGE_SIZE, (page));
+	return queue_var_show(queue_max_segment_size(q), (page));
 }
 
 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)