[PATCH] md: move bitmap_create to after md array has been initialised

This is important because bitmap_create uses
  mddev->resync_max_sectors
and that doesn't have a valid value until after the array
has been initialised (with pers->run()).
[It doesn't make a difference for current personalities that
 support bitmaps, but will make a difference for raid10]

This has the added advantage of meaning with can move the thread->timeout
manipulation inside the bitmap.c code instead of sprinkling identical code
throughout all personalities.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 15 insertions, 35 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 252d55d..b65c36d 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1530,6 +1530,8 @@ void bitmap_destroy(mddev_t *mddev)
 		return;
 
 	mddev->bitmap = NULL; /* disconnect from the md device */
+	if (mddev->thread)
+		mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
 
 	bitmap_free(bitmap);
 }
@@ -1636,6 +1638,8 @@ int bitmap_create(mddev_t *mddev)
 
 	if (IS_ERR(bitmap->writeback_daemon))
 		return PTR_ERR(bitmap->writeback_daemon);
+	mddev->thread->timeout = bitmap->daemon_sleep * HZ;
+
 	return bitmap_update_sb(bitmap);
 
  error:
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b4fb724..ee199d4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2054,13 +2054,15 @@ static int do_md_run(mddev_t * mddev)
 	if (start_readonly)
 		mddev->ro = 2; /* read-only, but switch on first write */
 
-	/* before we start the array running, initialise the bitmap */
-	err = bitmap_create(mddev);
-	if (err)
-		printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
-			mdname(mddev), err);
-	else
-		err = mddev->pers->run(mddev);
+	err = mddev->pers->run(mddev);
+	if (!err && mddev->pers->sync_request) {
+		err = bitmap_create(mddev);
+		if (err) {
+			printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
+			       mdname(mddev), err);
+			mddev->pers->stop(mddev);
+		}
+	}
 	if (err) {
 		printk(KERN_ERR "md: pers->run() failed ...\n");
 		module_put(mddev->pers->owner);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index f520414..c618015 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1611,7 +1611,6 @@ static int run(mddev_t *mddev)
 		       mdname(mddev));
 		goto out_free_conf;
 	}
-	if (mddev->bitmap) mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
 
 	printk(KERN_INFO 
 		"raid1: raid set %s active with %d out of %d mirrors\n",
@@ -1783,13 +1782,6 @@ static void raid1_quiesce(mddev_t *mddev, int state)
 		lower_barrier(conf);
 		break;
 	}
-	if (mddev->thread) {
-		if (mddev->bitmap)
-			mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
-		else
-			mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
-		md_wakeup_thread(mddev->thread);
-	}
 }
 
 
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 53a0f2c..0d016a8 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1964,9 +1964,6 @@ static int run(mddev_t *mddev)
 	/* Ok, everything is just fine now */
 	sysfs_create_group(&mddev->kobj, &raid5_attrs_group);
 
-	if (mddev->bitmap)
-		mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
-
 	mddev->queue->unplug_fn = raid5_unplug_device;
 	mddev->queue->issue_flush_fn = raid5_issue_flush;
 
@@ -2200,14 +2197,8 @@ static void raid5_quiesce(mddev_t *mddev, int state)
 		spin_unlock_irq(&conf->device_lock);
 		break;
 	}
-	if (mddev->thread) {
-		if (mddev->bitmap)
-			mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
-		else
-			mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
-		md_wakeup_thread(mddev->thread);
-	}
 }
+
 static mdk_personality_t raid5_personality=
 {
 	.name		= "raid5",
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 9ac6dcd..304455d 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1990,9 +1990,6 @@ static int run(mddev_t *mddev)
 	/* Ok, everything is just fine now */
 	mddev->array_size =  mddev->size * (mddev->raid_disks - 2);
 
-	if (mddev->bitmap)
-		mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
-
 	mddev->queue->unplug_fn = raid6_unplug_device;
 	mddev->queue->issue_flush_fn = raid6_issue_flush;
 	return 0;
@@ -2228,14 +2225,8 @@ static void raid6_quiesce(mddev_t *mddev, int state)
 		spin_unlock_irq(&conf->device_lock);
 		break;
 	}
-	if (mddev->thread) {
-		if (mddev->bitmap)
-			mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
-		else
-			mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
-		md_wakeup_thread(mddev->thread);
-	}
 }
+
 static mdk_personality_t raid6_personality=
 {
 	.name		= "raid6",