[PATCH v2 1/4] block: Add a helper to validate the block size

From: Xie Yongji <xieyongji@bytedance.com>
To: axboe@kernel.dk, hch@lst.de, josef@toxicpanda.com,
	mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com,
	kwolf@redhat.com
Cc: linux-block@vger.kernel.org, nbd@other.debian.org,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v2 1/4] block: Add a helper to validate the block size
Date: Mon, 25 Oct 2021 22:25:03 +0800	[thread overview]
Message-ID: <20211025142506.167-2-xieyongji@bytedance.com> (raw)
In-Reply-To: <20211025142506.167-1-xieyongji@bytedance.com>

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: Xie Yongji <xieyongji@bytedance.com>
---
 include/linux/blkdev.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 12b9dbcc980e..805cd02d7914 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -235,6 +235,14 @@ struct request {
 	void *end_io_data;
 };
 
+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;
+}
+
 static inline bool blk_op_is_passthrough(unsigned int op)
 {
 	op &= REQ_OP_MASK;
-- 
2.11.0

