From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 11D1C7CA3 for ; Thu, 17 Mar 2016 09:30:42 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id 68F0BAC008 for ; Thu, 17 Mar 2016 07:30:41 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id 01kHRUHkMimiTJZ1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Thu, 17 Mar 2016 07:30:40 -0700 (PDT) From: Brian Foster Subject: [RFC PATCH 6/9] dm: add method to provision space 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> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com 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; -- 2.4.3 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs