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>
Cc: Tadeusz Struk <tadeusz.struk@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 683aee3654200995453d2700cdfe084eadbb3d2d..0a9fdcbbab83d1123afb0a281386e5367a590c98 100644 (file)
--- 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;