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→How file can lose it's path
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There's a third possibility for a file not to have a visible name. But this is another story, that has nothing to do with dumping opened files, this it's described in a [[How to open a file without open system call|another article]].
There's a third possibility for a file not to have a visible name. But this is another story, that has nothing to do with dumping opened files, this it's described in a [[How to open a file without open system call|another article]].
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+=== Overmounted files ===
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+If a task opens a file and then a new mountpoint appears on any part of its path, the original file's path may become non existing or point to different file. In Linux there's no way to open a file by a name looking ''under'' certain mount points, but there's the openat() call which may look up a file starting from arbitrary point which, in turn, can be over-mounted too.
== What CRIU does about it ==
== What CRIU does about it ==