linux-kernel - [PATCH 3/3] brd: remove brd_rw

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Date:   Fri, 28 Jul 2017 10:56:04 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        "karam . lee" <karam.lee@....com>,
        Minchan Kim <minchan@...nel.org>,
        Jerome Marchand <jmarchan@...hat.com>,
        Nitin Gupta <ngupta@...are.org>, seungho1.park@....com,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>,
        Vishal Verma <vishal.l.verma@...el.com>,
        linux-nvdimm@...ts.01.org
Subject: [PATCH 3/3] brd: remove brd_rw_page()

The rw_page() interface doesn't provide a clear performance benefit for
BRD and has had a nonzero maintenance burden, so remove it.

Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Suggested-by: Dan Williams <dan.j.williams@...el.com>
Suggested-by: Christoph Hellwig <hch@...radead.org>
Cc: Matthew Wilcox <willy@...radead.org>
---
 drivers/block/brd.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 104b71c..29325058 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -322,15 +322,6 @@ static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
 	return BLK_QC_T_NONE;
 }
 
-static int brd_rw_page(struct block_device *bdev, sector_t sector,
-		       struct page *page, bool is_write)
-{
-	struct brd_device *brd = bdev->bd_disk->private_data;
-	int err = brd_do_bvec(brd, page, PAGE_SIZE, 0, is_write, sector);
-	page_endio(page, is_write, err);
-	return err;
-}
-
 #ifdef CONFIG_BLK_DEV_RAM_DAX
 static long __brd_direct_access(struct brd_device *brd, pgoff_t pgoff,
 		long nr_pages, void **kaddr, pfn_t *pfn)
@@ -370,7 +361,6 @@ static const struct dax_operations brd_dax_ops = {
 
 static const struct block_device_operations brd_fops = {
 	.owner =		THIS_MODULE,
-	.rw_page =		brd_rw_page,
 };
 
 /*
-- 
2.9.4