From: Xie Yongji <xieyongji@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@xxxxxxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/linux/blkdev.h | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -56,6 +56,14 @@ struct blk_stat_callback; */ #define BLKCG_MAX_POLS 5 +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)
