From patchwork Thu Mar 17 14:30:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Foster X-Patchwork-Id: 8617621 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: X-Original-To: patchwork-dm-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0EEE7C0553 for ; Fri, 18 Mar 2016 10:02:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3BD5D2034B for ; Fri, 18 Mar 2016 10:02:10 +0000 (UTC) Received: from mx5-phx2.redhat.com (mx5-phx2.redhat.com [209.132.183.37]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4C3F020382 for ; Fri, 18 Mar 2016 10:02:09 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by mx5-phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2I9xS9t050354; Fri, 18 Mar 2016 05:59:28 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id u2HEUdHd022707 for ; Thu, 17 Mar 2016 10:30:39 -0400 Received: from bfoster.bfoster (dhcp-41-24.bos.redhat.com [10.18.41.24]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2HEUdtT026362; Thu, 17 Mar 2016 10:30:39 -0400 Received: by bfoster.bfoster (Postfix, from userid 1000) id A517912505D; Thu, 17 Mar 2016 10:30:37 -0400 (EDT) From: Brian Foster To: xfs@oss.sgi.com Date: Thu, 17 Mar 2016 10:30:34 -0400 Message-Id: <1458225037-24155-7-git-send-email-bfoster@redhat.com> In-Reply-To: <1458225037-24155-1-git-send-email-bfoster@redhat.com> References: <1458225037-24155-1-git-send-email-bfoster@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Fri, 18 Mar 2016 05:58:54 -0400 Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com Subject: [dm-devel] [RFC PATCH 6/9] dm: add method to provision space X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Brian Foster --- drivers/md/dm.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/device-mapper.h | 2 ++ 2 files changed, 37 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 4da5d3e..e1aec28 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -737,6 +737,40 @@ out: return r; } +static int dm_blk_provision_space(struct block_device *bdev, + sector_t offset, sector_t len) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + int srcu_idx; + struct dm_table *map; + struct dm_target *tgt; + int r = -EINVAL; + + map = dm_get_live_table(md, &srcu_idx); + + if (!map || !dm_table_get_size(map)) + goto out; + + /* We only support devices that have a single target */ + if (dm_table_get_num_targets(map) != 1) + goto out; + + tgt = dm_table_get_target(map, 0); + if (!tgt->type->provision_space) + goto out; + + if (dm_suspended_md(md)) { + r = -EAGAIN; + goto out; + } + + r = tgt->type->provision_space(tgt, offset, len); +out: + dm_put_live_table(md, srcu_idx); + + return r; +} + static struct dm_io *alloc_io(struct mapped_device *md) { return mempool_alloc(md->io_pool, GFP_NOIO); @@ -3798,6 +3832,7 @@ static const struct block_device_operations dm_blk_dops = { .pr_ops = &dm_pr_ops, .reserve_space = dm_blk_reserve_space, .get_reserved_space = dm_blk_get_reserved_space, + .provision_space = dm_blk_provision_space, .owner = THIS_MODULE }; diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 540c772..0ebf172 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -118,6 +118,7 @@ typedef int (*dm_busy_fn) (struct dm_target *ti); typedef int (*dm_reserve_space_fn) (struct dm_target *ti, sector_t nr_sects); typedef int (*dm_get_reserved_space_fn) (struct dm_target *ti, sector_t *nr_sects); +typedef int (*dm_provision_space_fn) (struct dm_target *ti, sector_t offset, sector_t len); void dm_error(const char *message); @@ -167,6 +168,7 @@ struct target_type { dm_io_hints_fn io_hints; dm_reserve_space_fn reserve_space; dm_get_reserved_space_fn get_reserved_space; + dm_provision_space_fn provision_space; /* For internal device-mapper use. */ struct list_head list;