block: Add a helper to validate the block size

mainline inclusion
from mainline-5.16
commit 570b1cac
category: bugfix
bugzilla: NA
CVE: NA

-------------------------------------------------

There are some duplicated codes to validate the block
size in block drivers. This limitation actually comes
from block layer, so this patch tries to add a new block
layer helper for that.
Signed-off-by: NXie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@bytedance.comSigned-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NWenchao Hao <haowenchao@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Reviewed-by: NMiaohe Lin <linmiaohe@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/linux/blkdev.h

@@ -56,6 +56,14 @@ struct blk_stat_callback;
  */
 #define BLKCG_MAX_POLS		5
 
+static inline int blk_validate_block_size(unsigned int bsize)
+{
+	if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
+		return -EINVAL;
+
+	return 0;
+}
+
 typedef void (rq_end_io_fn)(struct request *, blk_status_t);
 
 #define BLK_RL_SYNCFULL		(1U << 0)