linux-kernel - [PATCH v2 3/3] zram: implement rw

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Message-Id: <1413190542-23960-4-git-send-email-karam.lee@lge.com>
Date:	Mon, 13 Oct 2014 17:55:42 +0900
From:	karam.lee@....com
To:	minchan@...nel.org, ngupta@...are.org, linux-kernel@...r.kernel.org
Cc:	matthew.r.wilcox@...el.com, jmarchan@...hat.com,
	seungho1.park@....com, "karam.lee" <karam.lee@....com>
Subject: [PATCH v2 3/3] zram: implement rw_page operation of zram

From: "karam.lee" <karam.lee@....com>

This patch implements rw_page operation for zram block device.

Signed-off-by: karam.lee <karam.lee@....com>
---
 drivers/block/zram/zram_drv.c |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index b0c3a20..a44aab0 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -810,8 +810,45 @@ static void zram_slot_free_notify(struct block_device *bdev,
 	atomic64_inc(&zram->stats.notify_free);
 }
 
+static int zram_rw_page(struct block_device *bdev, sector_t sector,
+		       struct page *page, int rw)
+{
+	int offset, ret = 1;
+	u32 index;
+	struct zram *zram;
+	struct bio_vec bv;
+
+	zram = bdev->bd_disk->private_data;
+	if (!valid_io_request(zram, sector, PAGE_SIZE)) {
+		atomic64_inc(&zram->stats.invalid_io);
+		goto out;
+	}
+
+	down_read(&zram->init_lock);
+	if (unlikely(!init_done(zram))) {
+		ret = -ENOMEM;
+		goto out_unlock;
+	}
+
+	index = sector >> SECTORS_PER_PAGE_SHIFT;
+	offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT;
+
+	bv.bv_page = page;
+	bv.bv_len = PAGE_SIZE;
+	bv.bv_offset = 0;
+
+	ret = zram_bvec_rw(zram, &bv, index, offset, rw);
+	page_endio(page, rw, ret);
+
+out_unlock:
+	up_read(&zram->init_lock);
+out:
+	return ret;
+}
+
 static const struct block_device_operations zram_devops = {
 	.swap_slot_free_notify = zram_slot_free_notify,
+	.rw_page = zram_rw_page,
 	.owner = THIS_MODULE
 };
 
-- 
1.7.9.5

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