[PATCH] md: make sure md bitmap updates are flushed when array is stopped.
NeilBrown [Thu, 4 Aug 2005 19:53:35 +0000 (12:53 -0700)]
The recent change to never ignore the bitmap, revealed that the bitmap isn't
begin flushed properly when an array is stopped.

We call bitmap_daemon_work three times as there is a three-stage pipeline for
flushing updates to the bitmap file.

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>

drivers/md/bitmap.c
drivers/md/md.c
include/linux/raid/bitmap.h

index 09d32db..41df4cd 100644 (file)
@@ -1451,6 +1451,29 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset)
 }
 
 /*
+ * flush out any pending updates
+ */
+void bitmap_flush(mddev_t *mddev)
+{
+       struct bitmap *bitmap = mddev->bitmap;
+       int sleep;
+
+       if (!bitmap) /* there was no bitmap */
+               return;
+
+       /* run the daemon_work three time to ensure everything is flushed
+        * that can be
+        */
+       sleep = bitmap->daemon_sleep;
+       bitmap->daemon_sleep = 0;
+       bitmap_daemon_work(bitmap);
+       bitmap_daemon_work(bitmap);
+       bitmap_daemon_work(bitmap);
+       bitmap->daemon_sleep = sleep;
+       bitmap_update_sb(bitmap);
+}
+
+/*
  * free memory that was allocated
  */
 void bitmap_destroy(mddev_t *mddev)
index 9fd4dbe..480f658 100644 (file)
@@ -1798,6 +1798,8 @@ static int do_md_stop(mddev_t * mddev, int ro)
                                goto out;
                        mddev->ro = 1;
                } else {
+                       bitmap_flush(mddev);
+                       wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
                        if (mddev->ro)
                                set_disk_ro(disk, 0);
                        blk_queue_make_request(mddev->queue, md_fail_request);
index 6213e97..4bf1659 100644 (file)
@@ -248,6 +248,7 @@ struct bitmap {
 
 /* these are used only by md/bitmap */
 int  bitmap_create(mddev_t *mddev);
+void bitmap_flush(mddev_t *mddev);
 void bitmap_destroy(mddev_t *mddev);
 int  bitmap_active(struct bitmap *bitmap);