diff mbox series

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

Message ID 20211025142506.167-2-xieyongji@bytedance.com (mailing list archive)
State New, archived
Headers show
Series Add blk_validate_block_size() helper for drivers to validate block size | expand

Commit Message

Yongji Xie Oct. 25, 2021, 2:25 p.m. UTC 
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(+)
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Patch

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;