RTEMS Filesystem Design Guide
There are two pathname evaluation routines. The handler patheval() is called to find, verify privlages on and return information on a node that exists. The handler evalformake() is called to find, verify permissions, and return information on a node that is to become a parent. Additionally, evalformake() returns a pointer to the start of the name of the new node to be created.
Pathname evaluation is specific to a filesystem. Each filesystem is required to provide both a patheval() and an evalformake() routine. Both of these routines gets a name to evaluate and a node indicating where to start the evaluation.
RTEMS Filesystem Design Guide
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