md/bitmap: fix saving of events_cleared and other state.

If a bitmap is found to be 'stale' the events_cleared value
is set to match 'events'.
However if the array is degraded this does not get stored on disk.
This can subsequently lead to incorrect behaviour.

So change bitmap_update_sb to always update events_cleared in the
superblock from the known events_cleared.
For neatness also set ->state from ->flags.
This requires updating ->state whenever we update ->flags, which makes
sense anyway.

This is suitable for any active -stable release.

cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 5c9362792f1d..70bd738b8b99 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -493,11 +493,11 @@ void bitmap_update_sb(struct bitmap *bitmap)
         spin_unlock_irqrestore(&bitmap->lock, flags);
         sb = kmap_atomic(bitmap->sb_page, KM_USER0);
         sb->events = cpu_to_le64(bitmap->mddev->events);
-        if (bitmap->mddev->events < bitmap->events_cleared) {
+        if (bitmap->mddev->events < bitmap->events_cleared)
                 /* rocking back to read-only */
                 bitmap->events_cleared = bitmap->mddev->events;
-                sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
-        }
+        sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
+        sb->state = cpu_to_le32(bitmap->flags);
         /* Just in case these have been changed via sysfs: */
         sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
         sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
@@ -618,7 +618,7 @@ success:
         if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
                 bitmap->flags |= BITMAP_HOSTENDIAN;
         bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
-        if (sb->state & cpu_to_le32(BITMAP_STALE))
+        if (bitmap->flags & BITMAP_STALE)
                 bitmap->events_cleared = bitmap->mddev->events;
         err = 0;
 out:
@@ -652,9 +652,11 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
         switch (op) {
         case MASK_SET:
                 sb->state |= cpu_to_le32(bits);
+                bitmap->flags |= bits;
                 break;
         case MASK_UNSET:
                 sb->state &= cpu_to_le32(~bits);
+                bitmap->flags &= ~bits;
                 break;
         default:
                 BUG();