[dm-devel] [PATCH v2 03/10] block: add sectors_to_npage()/npage_to_sectors() helpers

[Zhen Lei]

Provide the conversion of "number of sectors"/"sector number" and
"number of pages"/"page number".

Suggested-by: Matthew Wilcox <willy at infradead.org>
Signed-off-by: Zhen Lei <thunder.leizhen at huawei.com>
---
 include/linux/blkdev.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 934f31fc15cd..5d8daaffc38b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -910,6 +910,8 @@ static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
 #define SECTOR_SIZE		(1 << SECTOR_SHIFT)
 #endif
 #define PAGE_SECTORS		(PAGE_SIZE / SECTOR_SIZE)
+#define sectors_to_npage(nr)	((nr) / PAGE_SECTORS)
+#define npage_to_sectors(nr)	((nr) * PAGE_SECTORS)
 
 /*
  * blk_rq_pos()			: the current sector
-- 
2.26.0.106.g9fadedd