linux-kernel - [PATCH 5.4 017/475] block: Add a helper to validate the block size

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Date:   Thu, 14 Apr 2022 15:06:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xie Yongji <xieyongji@...edance.com>,
        Jens Axboe <axboe@...nel.dk>, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 5.4 017/475] block: Add a helper to validate the block size

From: Xie Yongji <xieyongji@...edance.com>

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@...edance.com>
Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/blkdev.h |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -59,6 +59,14 @@ 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);
 
 /*