[PATCH 4.9 1/2] block: Add a helper to validate the block size

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From: Xie Yongji <xieyongji@xxxxxxxxxxxxx>

[ Upstream commit 570b1cac477643cbf01a45fa5d018430a1fddbce ]

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>
---
 include/linux/blkdev.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 848aab6c69823..8050724065524 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -49,6 +49,14 @@ struct pr_ops;
 
 typedef void (rq_end_io_fn)(struct request *, int);
 
+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;
+}
+
 #define BLK_RL_SYNCFULL		(1U << 0)
 #define BLK_RL_ASYNCFULL	(1U << 1)
 
-- 
2.35.1.1021.g381101b075-goog




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