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>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1c3d774d3c8391340db972532ab735357c42fe14..afbe2fcc476ac8ec48def343245f3187eccbcbd6 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -56,6 +56,14 @@ struct blk_stat_callback;
  */
 #define BLKCG_MAX_POLS         3
 
+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);
 
 #define BLK_RL_SYNCFULL                (1U << 0)