block: Add a helper to validate the block size

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>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6d95a4b36cfa7b0da4f1499dab3c6708ed654402..d2d627e2c782e7ec636c94726d6711c1206a2853 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -44,6 +44,14 @@ struct blk_crypto_profile;
  */
 #define BLKCG_MAX_POLS         6
 
+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;