[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 252d55df964..b65c36d9e24 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 b4fb7247b3e..ee199d46252 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 f5204149ab6..c618015f07f 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 53a0f2ce76c..0d016a844ec 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 9ac6dcd5512..304455d236f 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",