mount namespace + d_path question

[David Legault]

Hello,

Question regarding pathnames and mount namespaces. As I understand mount
namespaces enable different processes to mount filesystems at different
locations leading to different paths to the same underlying file.

When you do something like the below in kernel code:

d_path(&file->f_path, filename, PATH_MAX+11);

How can you guarantee that the returned full path is against the root/init
mount namespace instead of the calling process' mount namespace?

Thanks

David
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