md: add support for raising dm events.

dm uses scheduled work to raise events to user-space.
So allow md device to have work_structs and schedule them on an error.

Signed-off-by: NeilBrown <neilb@suse.de>

2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 012482a900f..f8775699e15 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6068,6 +6068,8 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
         md_wakeup_thread(mddev->thread);
+        if (mddev->event_work.func)
+                schedule_work(&mddev->event_work);
         md_new_event_inintr(mddev);
 }
 
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 6e7e3495f6e..c88b04745e8 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -318,6 +318,7 @@ struct mddev_s
         struct bio *barrier;
         atomic_t flush_pending;
         struct work_struct barrier_work;
+        struct work_struct event_work;  /* used by dm to report failure event */
 };