drbd: wait for meta data IO completion even with failed disk, unless force-detached

The intention of force-detach is to be able to deal with a completely
unresponsive lower level IO stack, which does not even deliver error
completions anymore, but no completion at all.

In all other cases, we must still wait for the meta data IO completion.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index e81085795ec4..bc6284ef21d5 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -123,13 +123,7 @@ void drbd_md_put_buffer(struct drbd_conf *mdev)
                 wake_up(&mdev->misc_wait);
 }
 
-static bool md_io_allowed(struct drbd_conf *mdev)
-{
-        enum drbd_disk_state ds = mdev->state.disk;
-        return ds >= D_NEGOTIATING || ds == D_ATTACHING;
-}
-
-void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
+void wait_until_done_or_force_detached(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
                                      unsigned int *done)
 {
         long dt;
@@ -141,9 +135,12 @@ void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing
         if (dt == 0)
                 dt = MAX_SCHEDULE_TIMEOUT;
 
-        dt = wait_event_timeout(mdev->misc_wait, *done || !md_io_allowed(mdev), dt);
-        if (dt == 0)
+        dt = wait_event_timeout(mdev->misc_wait,
+                        *done || test_bit(FORCE_DETACH, &mdev->flags), dt);
+        if (dt == 0) {
                 dev_err(DEV, "meta-data IO operation timed out\n");
+                drbd_chk_io_error(mdev, 1, DRBD_FORCE_DETACH);
+        }
 }
 
 static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
@@ -183,7 +180,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
                 bio_endio(bio, -EIO);
         else
                 submit_bio(rw, bio);
-        wait_until_done_or_disk_failure(mdev, bdev, &mdev->md_io.done);
+        wait_until_done_or_force_detached(mdev, bdev, &mdev->md_io.done);
         if (bio_flagged(bio, BIO_UPTODATE))
                 err = mdev->md_io.error;