linux-kernel - [PATCH v2 03/10] block: add sectors_to_npage()/npage_to

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Message-ID: <20200507075100.1779-4-thunder.leizhen@huawei.com>
Date:   Thu, 7 May 2020 15:50:53 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        "Sergey Senozhatsky" <sergey.senozhatsky.work@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Coly Li <colyli@...e.de>,
        Kent Overstreet <kent.overstreet@...il.com>,
        "Alasdair Kergon" <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        linux-block <linux-block@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>, dm-devel <dm-devel@...hat.com>,
        Song Liu <song@...nel.org>,
        linux-raid <linux-raid@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH v2 03/10] block: add sectors_to_npage()/npage_to_sectors() helpers

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

Suggested-by: Matthew Wilcox <willy@...radead.org>
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.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