From 570b1cac477643cbf01a45fa5d018430a1fddbce Mon Sep 17 00:00:00 2001
From: Xie Yongji <xieyongji@bytedance.com>
Date: Tue, 26 Oct 2021 22:40:12 +0800
Subject: [PATCH] block: Add a helper to validate the block size
Git-commit: 570b1cac477643cbf01a45fa5d018430a1fddbce
Patch-mainline: v5.16-rc1
References: git-fixes

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.

(Coly Li: rebase for Linux v4.12 based SUSE kernel)

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Coly Li <colyli@suse.de>

---
 include/linux/blkdev.h |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -308,6 +308,13 @@ static inline unsigned short req_get_iop
 	return req->ioprio;
 }
 
+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;
+}
+
 #include <linux/elevator.h>
 
 struct blk_queue_ctx;