block: Add a helper to validate the block size

BugLink: https://bugs.launchpad.net/bugs/1951820
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>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

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;