From 602210ebc39144fcfee25f1758d07588051e702e Mon Sep 17 00:00:00 2001 From: Xie Yongji Date: Tue, 26 Oct 2021 22:40:12 +0800 Subject: 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 Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@bytedance.com Signed-off-by: Jens Axboe Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- include/linux/blkdev.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 209ba8e7bd31..56fe682d9beb 100644 --- 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) -- cgit v1.2.3