block: don't require stable pages for non-PI metadata

Non-PI metadata doesn't contain checksums and thus doesn't require
stable pages.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240613084839.1044015-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/blk-integrity.c

@@ -379,7 +379,8 @@ void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template
 	bi->tag_size = template->tag_size;
 	bi->pi_offset = template->pi_offset;
 
-	blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
+	if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE)
+		blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
 
 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
 	if (disk->queue->crypto_profile) {
@@ -404,7 +405,8 @@ void blk_integrity_unregister(struct gendisk *disk)
 	if (!bi->tuple_size)
 		return;
 
-	blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, disk->queue);
+	if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE)
+		blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, disk->queue);
 	memset(bi, 0, sizeof(*bi));
 }
 EXPORT_SYMBOL(blk_integrity_unregister);