RTEMS Filesystem Design Guide
If the filesystem supports the mount command, the evaluate routines must handle crossing the mountpoint. The evaluate routine should evaluate the name upto the first directory node where the new filesystem is mounted. The filesystem may process terminator characters prior to calling the evaluate routine for the new filesystem. A pointer to the portion of the name which has not been evaluated along with the root node of the new file system ( gotten from the mount table entry ) is passed to the correct mounted filesystem evaluate routine.
RTEMS Filesystem Design Guide
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