Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752024AbbGMIjk (ORCPT ); Mon, 13 Jul 2015 04:39:40 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:54003 "EHLO prv3-mh.provo.novell.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751908AbbGMIji (ORCPT ); Mon, 13 Jul 2015 04:39:38 -0400 From: Nick Wang To: nwang@suse.com Cc: philipp.reisner@linbit.com, Lars Ellenberg , drbd-dev@lists.linbit.com, linux-kernel@vger.kernel.org Subject: [Patch v2 03/10] drbd: A function to zero out drbd backing device Date: Mon, 13 Jul 2015 16:38:57 +0800 Message-Id: <1436776744-3135-4-git-send-email-nwang@suse.com> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1436776744-3135-1-git-send-email-nwang@suse.com> References: <1436776744-3135-1-git-send-email-nwang@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2087 Lines: 65 The function can be used to zero out the whole backing device. Signed-off-by: Nick Wang CC: Philipp Reisner CC: Lars Ellenberg CC: drbd-dev@lists.linbit.com CC: linux-kernel@vger.kernel.org --- drbd/drbd_int.h | 1 + drbd/drbd_worker.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/drbd/drbd_int.h b/drbd/drbd_int.h index a234228..9ecf971 100644 --- a/drbd/drbd_int.h +++ b/drbd/drbd_int.h @@ -1662,6 +1662,7 @@ extern void drbd_send_acks_wf(struct work_struct *ws); extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, bool throttle_if_app_is_waiting); +extern int zero_out_local_device(struct drbd_device *device); extern int drbd_submit_peer_request(struct drbd_device *, struct drbd_peer_request *, const unsigned, const int); diff --git a/drbd/drbd_worker.c b/drbd/drbd_worker.c index 2a15aeb..50564f5 100644 --- a/drbd/drbd_worker.c +++ b/drbd/drbd_worker.c @@ -1653,6 +1653,27 @@ void drbd_rs_controller_reset(struct drbd_device *device) rcu_read_unlock(); } +/** + * zero_out_local_device() + * @device: DRBD device. + * + * Description: + * Zero out drbd backing device when creating new uuid. + * +**/ +int zero_out_local_device(struct drbd_device *device) +{ + struct block_device *bdev; + + bdev = device->ldev->backing_bdev; + if (device->ldev->known_size != drbd_get_capacity(bdev)) + device->ldev->known_size = drbd_get_capacity(bdev); + + /* zero out the backing device */ + return blkdev_issue_zeroout(bdev, 0, + device->ldev->known_size, GFP_NOIO, false); +} + void start_resync_timer_fn(unsigned long data) { struct drbd_device *device = (struct drbd_device *) data; -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/