If you DONT use noac when mounting, is there a command to refresh the file and directory attributes given a path

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http://serverfault.com – I may be asking this question in the wrong place. We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a command I can execute from c to refresh the attributes of a path and all its files. EDIT: I shou (HowTos)