why does fsync() on a tmpfs directory give EINVAL?

From: Chris Friesen
Date: Thu Jun 16 2005 - 15:08:55 EST

The man page for fsync() suggests that it is necessary to call it on the directory fd.

However, in the case of tmpfs, fsync() on the file completes, but on the directory it returns -1 with errno==EINVAL.

Is there any particular reason for this? Would a patch that makes it just return successfully without doing anything be accepted?

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