FAILED: patch "[PATCH] btrfs: dev-replace: go back to suspended state if target" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0d228ece59a35a9b9e8ff0d40653234a6d90f61e Mon Sep 17 00:00:00 2001
From: Anand Jain <[email protected]>
Date: Sun, 11 Nov 2018 22:22:17 +0800
Subject: [PATCH] btrfs: dev-replace: go back to suspended state if target
device is missing

At the time of forced unmount we place the running replace to BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED state, so when the system comes back and expect the target device is missing.

Then let the replace state continue to be in BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED state instead of BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED as there isn't any matching scrub running as part of replace.

index 32da6901dc88..11df8f778b63 100644
@@ -890,6 +890,8 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
 			   "cannot continue dev_replace, tgtdev is missing");
 		btrfs_info(fs_info,
 			   "you may cancel the operation after 'mount -o degraded'");
+		dev_replace->replace_state =
+					BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
 		btrfs_dev_replace_write_unlock(dev_replace);
 		return 0;
 	}