From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: [PATCH v2 02/12] dm: introduce num_discard_requests in dm_target structure Date: Sat, 24 Jul 2010 12:09:18 -0400 Message-ID: <1279987768-13275-3-git-send-email-snitzer@redhat.com> References: <1279987768-13275-1-git-send-email-snitzer@redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1279987768-13275-1-git-send-email-snitzer@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids A target with num_discard_requests > 0 supports discard requests. The configured number of discard requests will be submitted to the target. Signed-off-by: Mike Snitzer --- drivers/md/dm-linear.c | 1 + include/linux/device-mapper.h | 6 ++++++ 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 7071f17..8e925fa 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -53,6 +53,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv) } ti->num_flush_requests = 1; + ti->num_discard_requests = 1; ti->private = lc; return 0; diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 87beab7..0fe597d 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -181,6 +181,12 @@ struct dm_target { */ unsigned num_flush_requests; + /* + * The number of discard requests that will be submitted to the + * target. map_info->request_nr is used just like num_flush_requests. + */ + unsigned num_discard_requests; + /* target specific data */ void *private; -- 1.6.6.1