From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753397AbaJMI4J (ORCPT ); Mon, 13 Oct 2014 04:56:09 -0400 Received: from LGEMRELSE6Q.lge.com ([156.147.1.121]:44442 "EHLO lgemrelse6q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753146AbaJMI4D (ORCPT ); Mon, 13 Oct 2014 04:56:03 -0400 X-Original-SENDERIP: 10.177.226.38 X-Original-MAILFROM: karam.lee@lge.com From: karam.lee@lge.com To: minchan@kernel.org, ngupta@vflare.org, linux-kernel@vger.kernel.org Cc: matthew.r.wilcox@intel.com, jmarchan@redhat.com, seungho1.park@lge.com, "karam.lee" Subject: [PATCH v2 3/3] zram: implement rw_page operation of zram Date: Mon, 13 Oct 2014 17:55:42 +0900 Message-Id: <1413190542-23960-4-git-send-email-karam.lee@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413190542-23960-1-git-send-email-karam.lee@lge.com> References: <1413190542-23960-1-git-send-email-karam.lee@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "karam.lee" This patch implements rw_page operation for zram block device. Signed-off-by: karam.lee --- 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