+       btrfs_info(fs_info, "dev_replace from %s (devid %llu) to %s canceled",
+                  btrfs_dev_name(src_device), src_device->devid,
+                  rcu_str_deref(tgt_device->name));

The behavior is quite good.

Although I'm wondering why for @src_device we use btrfs_dev_name() but
rcu_str_deref() for @tgt_device?

  Thanks for the comments.
  My bad. In fact, I must use btrfs_dev_name() for tgt_device since
  the tgt_device can be missing (-o degraded) when the user decides
  to cancel.

Thanks, Anand
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