[PATCH] md: all hot-add and hot-remove of md intent logging bitmaps

Both file-bitmaps and superblock bitmaps are supported.

If you add a bitmap file on the array device, you lose.

This introduces a 'default_bitmap_offset' field in mddev, as the ioctl used
for adding a superblock bitmap doesn't have room for giving an offset.  Later,
this value will be setable via sysfs.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index ace41c571aeb..ba643e4bfac9 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1565,6 +1565,35 @@ static int raid1_reshape(mddev_t *mddev, int raid_disks)
         return 0;
 }
 
+void raid1_quiesce(mddev_t *mddev, int state)
+{
+        conf_t *conf = mddev_to_conf(mddev);
+
+        switch(state) {
+        case 0:
+                spin_lock_irq(&conf->resync_lock);
+                conf->barrier++;
+                wait_event_lock_irq(conf->wait_idle, !conf->nr_pending,
+                                    conf->resync_lock, raid1_unplug(mddev->queue));
+                spin_unlock_irq(&conf->resync_lock);
+                break;
+        case 1:
+                spin_lock_irq(&conf->resync_lock);
+                conf->barrier--;
+                spin_unlock_irq(&conf->resync_lock);
+                wake_up(&conf->wait_resume);
+                wake_up(&conf->wait_idle);
+                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 raid1_personality =
 {
@@ -1581,6 +1610,7 @@ static mdk_personality_t raid1_personality =
         .sync_request   = sync_request,
         .resize         = raid1_resize,
         .reshape        = raid1_reshape,
+        .quiesce        = raid1_quiesce,
 };
 
 static int __init raid_init(void)