From patchwork Thu Apr 15 06:43:02 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: NeilBrown X-Patchwork-Id: 92683 X-Patchwork-Delegate: jbrassow@redhat.com Received: from mx01.colomx.prod.int.phx2.redhat.com (mx3-phx2.redhat.com [209.132.183.24]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o3F6rSK1022361 for ; Thu, 15 Apr 2010 06:54:05 GMT Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by mx01.colomx.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3F6pBsv026565; Thu, 15 Apr 2010 02:51:12 -0400 Received: from int-mx03.intmail.prod.int.phx2.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.16]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3F6oTdq010586 for ; Thu, 15 Apr 2010 02:50:29 -0400 Received: from mx1.redhat.com (ext-mx06.extmail.prod.ext.phx2.redhat.com [10.5.110.10]) by int-mx03.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3F6oOcN016421 for ; Thu, 15 Apr 2010 02:50:24 -0400 Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o3F6oCYE031697 for ; Thu, 15 Apr 2010 02:50:13 -0400 Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.221.2]) by mx2.suse.de (Postfix) with ESMTP id 0A7D58726A; Thu, 15 Apr 2010 08:50:12 +0200 (CEST) From: NeilBrown To: dm-devel@redhat.com Date: Thu, 15 Apr 2010 16:43:02 +1000 Message-ID: <20100415064302.15646.73901.stgit@notabene.brown> In-Reply-To: <20100415062909.15646.16.stgit@notabene.brown> References: <20100415062909.15646.16.stgit@notabene.brown> User-Agent: StGit/0.15 MIME-Version: 1.0 X-RedHat-Spam-Score: -2.31 (RCVD_IN_DNSWL_MED,T_RP_MATCHES_RCVD) X-Scanned-By: MIMEDefang 2.67 on 10.5.11.16 X-Scanned-By: MIMEDefang 2.67 on 10.5.110.10 X-loop: dm-devel@redhat.com Cc: linux-raid@vger.kernel.org Subject: [dm-devel] [PATCH 08/12] md/plug: optionally use plugger to unplug an array during resync/recovery. X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk Reply-To: device-mapper development List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Thu, 15 Apr 2010 06:54:05 +0000 (UTC) diff --git a/drivers/md/md.c b/drivers/md/md.c index 49336e7..b292dc5 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4660,6 +4660,7 @@ static void md_clean(mddev_t *mddev) mddev->bitmap_info.chunksize = 0; mddev->bitmap_info.daemon_sleep = 0; mddev->bitmap_info.max_write_behind = 0; + mddev->plug = NULL; } static void md_stop_writes(mddev_t *mddev) @@ -6563,6 +6564,14 @@ int md_allow_write(mddev_t *mddev) } EXPORT_SYMBOL_GPL(md_allow_write); +static void md_unplug(mddev_t *mddev) +{ + if (mddev->queue) + blk_unplug(mddev->queue); + if (mddev->plug) + mddev->plug->unplug_fn(mddev->plug); +} + #define SYNC_MARKS 10 #define SYNC_MARK_STEP (3*HZ) void md_do_sync(mddev_t *mddev) @@ -6741,7 +6750,7 @@ void md_do_sync(mddev_t *mddev) >= mddev->resync_max - mddev->curr_resync_completed )) { /* time to update curr_resync_completed */ - blk_unplug(mddev->queue); + md_unplug(mddev); wait_event(mddev->recovery_wait, atomic_read(&mddev->recovery_active) == 0); mddev->curr_resync_completed = @@ -6818,7 +6827,7 @@ void md_do_sync(mddev_t *mddev) * about not overloading the IO subsystem. (things like an * e2fsck being done on the RAID array should execute fast) */ - blk_unplug(mddev->queue); + md_unplug(mddev); cond_resched(); currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 @@ -6837,7 +6846,7 @@ void md_do_sync(mddev_t *mddev) * this also signals 'finished resyncing' to md_stop */ out: - blk_unplug(mddev->queue); + md_unplug(mddev); wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); diff --git a/drivers/md/md.h b/drivers/md/md.h index 1c14c33..e4f60ae 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -319,6 +319,8 @@ struct mddev_s struct list_head all_mddevs; struct attribute_group *to_remove; + struct plug_handle *plug; /* if used by personality */ + /* Generic barrier handling. * If there is a pending barrier request, all other * writes are blocked while the devices are flushed. diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index ac63012..fae805e 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5111,6 +5111,7 @@ static int run(mddev_t *mddev) md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); plugger_init(&conf->plug, raid5_unplug); + mddev->plug = &conf->plug; if (mddev->queue) { /* read-ahead size must cover two whole stripes, which * is 2 * (datadisks) * chunksize where 'n' is the