From: Xie Yongji <xieyongji@bytedance.com>
Date: Tue, 26 Oct 2021 14:40:12 +0000 (+0800)
Subject: block: Add a helper to validate the block size
X-Git-Tag: v5.14.21~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e2d865b3109c5dae84347ad67069fa4cb1935a9c;p=thirdparty%2Fkernel%2Fstable.git

block: Add a helper to validate the block size

commit 570b1cac477643cbf01a45fa5d018430a1fddbce upstream.

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>
Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e7979fe7e4fad..42ed8ccc40e77 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -240,6 +240,14 @@ 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;