kleink b7877d3fc0 Implement support for IEEE Std 1003.1b-1993 syncronous I/O:
* if synchronized I/O file integrity completion of read operations was
  requested, set IO_SYNC in the ioflag passed to the read vnode operator.
* if synchronized I/O data integrity completion of write operations was
  requested, set IO_DSYNC in the ioflag passed to the write vnode operator.
1998-08-02 18:39:14 +00:00
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