f.relb()
F.RELB locates all free buffers in the cache of FMS buffers and releases them to the memory pool. A free buffer is one that is not currently marked busy by F.BUSY.
If there are no busy buffers, all buffers will be released. This has the effect of clearing the cache so that further calls to the FMS routines will reread the information from the file system. You need to do this in situations where you know the file system has changed during the running of the program.
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