linux-kernel - [PATCH 1/3] btt: remove btt_rw

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Date:   Fri, 28 Jul 2017 10:56:02 -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 1/3] btt: remove btt_rw_page()

The rw_page() interface doesn't provide a clear performance benefit for the
BTT 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/nvdimm/btt.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 14323fa..e10d330 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1236,20 +1236,6 @@ static blk_qc_t btt_make_request(struct request_queue *q, struct bio *bio)
 	return BLK_QC_T_NONE;
 }
 
-static int btt_rw_page(struct block_device *bdev, sector_t sector,
-		struct page *page, bool is_write)
-{
-	struct btt *btt = bdev->bd_disk->private_data;
-	int rc;
-
-	rc = btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
-	if (rc == 0)
-		page_endio(page, is_write, 0);
-
-	return rc;
-}
-
-
 static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo)
 {
 	/* some standard values */
@@ -1261,7 +1247,6 @@ static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo)
 
 static const struct block_device_operations btt_fops = {
 	.owner =		THIS_MODULE,
-	.rw_page =		btt_rw_page,
 	.getgeo =		btt_getgeo,
 	.revalidate_disk =	nvdimm_revalidate_disk,
 };
-- 
2.9.4