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Commit 7b565d9d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'md/4.1-rc7-fixes' of git://neil.brown.name/md 

Pull three more md fixes from Neil Brown:
 "Hasn't been a good cycle for md has it :-(

  The main issue fixed here is a rare race which can result in two
  reshape threads running at once, which doesn't end well.

  Also a minor issue with a write to a sysfs file returning the wrong
  value.  Backports to 4.0-stable are indicated"

* tag 'md/4.1-rc7-fixes' of git://neil.brown.name/md:
  md: make sure MD_RECOVERY_DONE is clear before starting recovery/resync
  md: Close race when setting 'action' to 'idle'.
  md: don't return 0 from array_state_store
parents c39f3bc6 ea358cd0

drivers/md/md.c

+8 −6
Original line number Diff line number Diff line
@@ -3834,7 +3834,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) 
				err = -EBUSY;

		}

		spin_unlock(&mddev->lock);

		return err;

		return err ?: len;

	}

	err = mddev_lock(mddev);

	if (err)
@@ -4217,13 +4217,14 @@ action_store(struct mddev *mddev, const char *page, size_t len) 
			set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);

		else

			clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);

		if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&

		    mddev_lock(mddev) == 0) {

			flush_workqueue(md_misc_wq);

			if (mddev->sync_thread) {

				set_bit(MD_RECOVERY_INTR, &mddev->recovery);

			if (mddev_lock(mddev) == 0) {

				md_reap_sync_thread(mddev);

				mddev_unlock(mddev);

			}

			mddev_unlock(mddev);

		}

	} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||

		   test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
@@ -8261,6 +8262,7 @@ void md_reap_sync_thread(struct mddev *mddev) 
	if (mddev_is_clustered(mddev))

		md_cluster_ops->metadata_update_finish(mddev);

	clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);

	clear_bit(MD_RECOVERY_DONE, &mddev->recovery);

	clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);

	clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);

	clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);

drivers/md/raid10.c

+1 −0
Original line number Diff line number Diff line
@@ -4156,6 +4156,7 @@ static int raid10_start_reshape(struct mddev *mddev) 


	clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);

	clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);

	clear_bit(MD_RECOVERY_DONE, &mddev->recovery);

	set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);

	set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);

drivers/md/raid5.c

+1 −0
Original line number Diff line number Diff line
@@ -7354,6 +7354,7 @@ static int raid5_start_reshape(struct mddev *mddev) 


	clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);

	clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);

	clear_bit(MD_RECOVERY_DONE, &mddev->recovery);

	set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);

	set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);

	mddev->sync_thread = md_register_thread(md_do_sync, mddev,