1 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/block-rsv.c b/fs/btrfs/block-rsv.c
index ec96285357e0..89e3e7d1bff6 100644
--- a/fs/btrfs/block-rsv.c
+++ b/fs/btrfs/block-rsv.c
@@ -552,5 +552,17 @@ try_reserve:
 		if (!ret)
 			return global_rsv;
 	}
+
+	/*
+	 * All hope is lost, but of course our reservations are overly
+	 * pessimistic, so instead of possibly having an ENOSPC abort here, try
+	 * one last time to force a reservation if there's enough actual space
+	 * on disk to make the reservation.
+	 */
+	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv, blocksize,
+					   BTRFS_RESERVE_FLUSH_EMERGENCY);
+	if (!ret)
+		return block_rsv;
+
 	return ERR_PTR(ret);
 }