md: use new plugging interface for RAID IO.

md/raid submits a lot of IO from the various raid threads.
So adding start/finish plug calls to those so that some
plugging happens.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index c2a21ae..5449cd5 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1516,9 +1516,11 @@ static void raid1d(mddev_t *mddev)
        conf_t *conf = mddev->private;
        struct list_head *head = &conf->retry_list;
        mdk_rdev_t *rdev;
+       struct blk_plug plug;
 
        md_check_recovery(mddev);
-       
+
+       blk_start_plug(&plug);
        for (;;) {
                char b[BDEVNAME_SIZE];
 
@@ -1593,6 +1595,7 @@ static void raid1d(mddev_t *mddev)
                }
                cond_resched();
        }
+       blk_finish_plug(&plug);
 }
 
 

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 2da83d5..c8e5dac 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1640,9 +1640,11 @@ static void raid10d(mddev_t *mddev)
        conf_t *conf = mddev->private;
        struct list_head *head = &conf->retry_list;
        mdk_rdev_t *rdev;
+       struct blk_plug plug;
 
        md_check_recovery(mddev);
 
+       blk_start_plug(&plug);
        for (;;) {
                char b[BDEVNAME_SIZE];
 
@@ -1716,6 +1718,7 @@ static void raid10d(mddev_t *mddev)
                }
                cond_resched();
        }
+       blk_finish_plug(&plug);
 }
 
 

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e867ee4..ce6960b 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4478,11 +4478,13 @@ static void raid5d(mddev_t *mddev)
        struct stripe_head *sh;
        raid5_conf_t *conf = mddev->private;
        int handled;
+       struct blk_plug plug;
 
        pr_debug("+++ raid5d active\n");
 
        md_check_recovery(mddev);
 
+       blk_start_plug(&plug);
        handled = 0;
        spin_lock_irq(&conf->device_lock);
        while (1) {
@@ -4525,6 +4527,7 @@ static void raid5d(mddev_t *mddev)
        spin_unlock_irq(&conf->device_lock);
 
        async_tx_issue_pending_all();
+       blk_finish_plug(&plug);
 
        pr_debug("--- raid5d inactive\n");
 }